CN216572463U

CN216572463U - Reverse osmosis membrane element and assembly

Info

Publication number: CN216572463U
Application number: CN202220043371.8U
Authority: CN
Inventors: 杨长智
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-01-08
Filing date: 2022-01-08
Publication date: 2022-05-24
Anticipated expiration: 2032-01-08

Abstract

The utility model provides a reverse osmosis membrane element and subassembly relates to reverse osmosis membrane technical field. The utility model provides a reverse osmosis membrane element, including the membrane main part, the center tube, the membrane shell, the end cover is sealed to preceding end cover and back, membrane main part and center tube are located the membrane shell, the membrane main part cover is established on the center tube, the preceding end cover that seals sets up in the one end of membrane shell, the back end cover that seals sets up in the other end of membrane shell, the one end of center tube is passed the preceding end cover that seals, and be connected with the bayonet joint, set up the spacing groove that matches with the bayonet joint on the back end cover that seals, the bayonet joint can stretch into the spacing inslot, the other end intercommunication of spacing groove and center tube, even spaced apart is equipped with a plurality of apertures on the center tube. This reverse osmosis membrane element can prevent that the wrong problem from appearing in the osmotic membrane installation direction, avoids causing economic loss because the osmotic membrane installation direction mistake.

Description

Reverse osmosis membrane element and assembly

Technical Field

The utility model relates to a reverse osmosis membrane technical field particularly, relates to a reverse osmosis membrane element and subassembly.

Background

The reverse osmosis membrane is an artificial semipermeable membrane with certain characteristics and is made by simulating a biological semipermeable membrane, and is a core component of a reverse osmosis technology. The principle of reverse osmosis is that under the action of the osmotic pressure higher than that of the solution, other substances are separated from water based on the fact that the substances cannot permeate a semipermeable membrane. The reverse osmosis membrane has a very small membrane pore size, and thus can effectively remove dissolved salts, colloids, microorganisms, organic substances, and the like in water. The system has the advantages of good water quality, low energy consumption, no pollution, simple process, simple and convenient operation and the like. The existing industrial reverse osmosis membranes generally need to be connected together to be installed in a membrane shell for use, the number of the industrial reverse osmosis membranes is generally 2 to 8, during installation, the water inlet direction of the membrane shell is firstly confirmed, a first reverse osmosis membrane is prepared, the water inlet direction of the first reverse osmosis membrane is adjusted to be the same as the water inlet direction of the membrane shell, and then the first reverse osmosis membrane is slowly filled into the membrane shell. Before the filling is completed, the central pipe connector is suspended, the central pipe connector is inserted into the central pipe of the first reverse osmosis membrane, the direction of the second reverse osmosis membrane is adjusted to be the same as the water inlet direction of the membrane shell, the water outlet end of the second reverse osmosis membrane is connected with the water inlet end of the first reverse osmosis membrane through the central pipe, then the second reverse osmosis membrane is slowly filled into the membrane shell, and the like until the reverse osmosis membranes with proper quantity are filled into the membrane shell, and the filling of one membrane shell is completed. At present, the anti-stress devices at two ends of an industrial reverse osmosis membrane have the same structure, only a raw water sealing ring is arranged on the anti-stress device at a water inlet end, the direction of the reverse osmosis membrane needs to be confirmed manually by the method, the condition of error confirmation exists, if one reverse osmosis membrane is reversely arranged, a large amount of raw water flows through the reverse osmosis membrane from the outer side of a glass fiber reinforced plastic shell, and the water yield is reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a reverse osmosis membrane element, it can prevent that the wrong problem from appearing in osmotic membrane installation direction, avoids causing economic loss because osmotic membrane installation direction mistake.

Another object of the present invention is to provide a reverse osmosis membrane module, which can be used to combine a plurality of permeable membrane cores, and can avoid the occurrence of wrong installation direction of the permeable membrane cores.

The embodiment of the utility model is realized like this:

in a first aspect, the embodiment of the application provides a reverse osmosis membrane element, including the membrane main part, the center tube, the membrane shell, preceding end cover and the back end cover of sealing, membrane main part and center tube are located the membrane shell, the membrane main part cover is established on the center tube, preceding end cover that seals sets up in the one end of membrane shell, the back end cover that seals sets up in the other end of membrane shell, the one end of center tube is passed preceding end cover of sealing, and be connected with the bayonet joint, set up the spacing groove that matches with the bayonet joint on the back end cover of sealing, the bayonet joint can stretch into the spacing inslot, the other end intercommunication of spacing groove and center tube, even spaced apart is equipped with a plurality of apertures on the center tube.

In some embodiments of the present invention, the front sealing end cap is provided with a plurality of water inlets spaced uniformly around the axis direction, and the adjacent water inlets are communicated with each other.

In some embodiments of the present invention, the rear sealing end cap is provided with a plurality of concentrated water outlets spaced apart from each other around the axis direction, and the adjacent concentrated water outlets are communicated with each other.

The utility model discloses an in some embodiments, the above-mentioned membrane shell that is located preceding sealing end cap side has upwards seted up the seal groove in circumference, is provided with first ring type seal in the seal groove.

In some embodiments of the present invention, an annular groove is formed on the inner side wall of the limiting groove, and a second sealing ring is disposed in the annular groove.

In some embodiments of the present invention, the membrane main body includes a mesh-shaped interlayer, an osmotic membrane, and a mesh layer, which are sequentially covered and disposed, and the mesh-shaped interlayer is disposed on the central tube.

In some embodiments of the present invention, the screen layer is covered with a membrane supporting layer.

In some embodiments of the present invention, the film main body end located at the rear sealing cover side is provided with an anti-stress device.

In some embodiments of the present invention, the free end of the plug is provided with a guide head, and the guide head is a circular truncated cone structure.

In a second aspect, an embodiment of the present application provides a reverse osmosis membrane assembly, which includes an outer casing and a plurality of reverse osmosis membrane elements, the plurality of reverse osmosis membrane elements are sequentially arranged in the outer casing, and in two adjacent reverse osmosis membrane elements, a plug connector of any reverse osmosis membrane element extends into a limiting groove of another reverse osmosis membrane element.

Compared with the prior art, the embodiment of the utility model has following advantage or beneficial effect at least:

the utility model provides a reverse osmosis membrane element, including membrane main part, center tube, membrane shell, preceding end cover and the back end cover of sealing. The membrane main body is a main component for filtering liquid needing to be filtered, and the liquid is filtered by a reverse osmosis principle. The central tube is used for discharging filtered pure liquid, the membrane shell is a component for mounting the membrane main body, and a flow direction channel formed by the membrane shell is convenient for liquid to flow and can also prevent the liquid from overflowing. The front sealing end cover and the rear sealing end cover are used for sealing two ends of the membrane shell, can limit the membrane main body to move along the axis direction, and can facilitate installation of the central tube. The membrane main body and the central tube are positioned in the membrane shell, the membrane main body is sleeved on the central tube, the front sealing end cover is arranged at one end of the membrane shell, the rear sealing end cover is arranged at the other end of the membrane shell, one end of the central tube penetrates through the front sealing end cover and is connected with a plug, a limiting groove matched with the plug is formed in the rear sealing end cover, the plug can extend into the limiting groove, and the limiting groove is communicated with the other end of the central tube. Liquid to be filtered enters the membrane shell along the front sealing end cover, so that the liquid enters a cavity structure between the central tube and the membrane shell, and a plurality of small holes are uniformly arranged on the central tube at intervals. When liquid passes through the membrane main body in the cavity structure, substances needing to be separated in the liquid enter the central tube by utilizing the reverse osmosis principle, and the separated substances can be discharged through the central tube after entering the central tube along the small holes. Likewise, the liquid component that is not separated by the center tube continues to move with the liquid to the rear sealed end cap for discharge. Above-mentioned in-process needs to connect a plurality of reverse osmosis membrane elements and uses, can further promote the filter effect. However, the water inlet direction and the water outlet direction of the existing reverse osmosis membrane element are difficult to determine, so that the plug connector and the limiting groove are arranged, the plug connector extends into the limiting groove and then serves as a guide structure, the plug connectors of a plurality of reverse osmosis models and the limiting groove are connected end to end in the installation process, the water inlet and outlet directions of the reverse osmosis membrane element can be consistent, the normal operation of production is ensured, and the reverse osmosis membrane element cannot be damaged.

Therefore, the reverse osmosis membrane element can prevent the problem that the installation direction of the osmosis membrane is wrong, and economic loss caused by wrong installation direction of the osmosis membrane is avoided.

The utility model also provides a reverse osmosis membrane subassembly, including shell body and a plurality of above-mentioned reverse osmosis membrane element, a plurality of above-mentioned reverse osmosis membrane element arrange in proper order in above-mentioned shell body, in two adjacent above-mentioned reverse osmosis membrane element, the bayonet joint of arbitrary reverse osmosis membrane element stretches into the spacing inslot of another reverse osmosis membrane element. The reverse osmosis membrane module can be used by combining a plurality of osmosis membrane cores conveniently, and the condition that the installation direction of the osmosis membrane cores is wrong can be avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is an enlarged view taken at A in FIG. 1;

fig. 3 is a schematic view of a connection structure according to an embodiment of the present invention;

fig. 4 is a schematic view of an installation structure of a front sealing end cover according to an embodiment of the present invention;

fig. 5 is a schematic view of an installation structure of a rear sealing end cap according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a membrane main body according to an embodiment of the present invention.

Icon: 1-rear sealing end cover, 2-limiting groove, 3-membrane shell, 4-central tube, 5-front sealing end cover, 6-plug connector, 7-second sealing ring, 8-water inlet, 9-outer shell, 10-membrane main body, 101-reticular interlayer, 102-permeable membrane, 103-sieve layer, 11-membrane supporting layer, 12-first sealing ring and 13-concentrated water outlet.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, the description is only for convenience of description of the present invention and simplification, but the indication or suggestion that the device or element to be referred must have a specific position, be constructed and operated in a specific position, and therefore, the present invention should not be construed as being limited thereto. Furthermore, the appearances of the terms first, second, third, etc. in this specification are only used for distinguishing between similar elements and not necessarily for describing or implying any particular importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not require that the components be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present invention, "a plurality" means at least 2 if appearing.

In the description of the embodiments of the present invention, it should be further noted that unless explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Example 1

Referring to fig. 1 and fig. 3, fig. 1 is a schematic structural diagram of an embodiment of the present invention; fig. 3 is a schematic view of a connection structure according to an embodiment of the present invention. The present embodiment provides a reverse osmosis membrane element comprising a membrane body 10, a central tube 4, a membrane shell 3, a front seal end cap 5 and a rear seal end cap 1. The membrane body 10 is a main component for filtering liquid to be filtered, and the liquid is filtered by the reverse osmosis principle. The central tube 4 is used for discharging filtered pure liquid, and the membrane shell 3 is a component for installing the membrane main body 10, and a flow direction channel formed by the component facilitates liquid flow and also prevents liquid from overflowing. The front sealing end cover 5 and the rear sealing end cover 1 are used for sealing two ends of the membrane shell 3, can limit the membrane main body 10 to move along the axis direction, and can facilitate the installation of the central tube 4. The membrane main body 10 and the central tube 4 are located in the membrane shell 3, the membrane main body 10 is sleeved on the central tube 4, the front sealing end cap 5 is arranged at one end of the membrane shell 3, the rear sealing end cap 1 is arranged at the other end of the membrane shell 3, one end of the central tube 4 penetrates through the front sealing end cap 5 and is connected with a plug 6, a limiting groove 2 matched with the plug 6 is formed in the rear sealing end cap 1, the plug 6 can extend into the limiting groove 2, and the limiting groove 2 is communicated with the other end of the central tube 4. Liquid to be filtered enters the membrane shell 3 along the front sealing end cover 5, so that the liquid enters a cavity structure between the central tube 4 and the membrane shell 3, and a plurality of small holes are uniformly arranged on the central tube 4 at intervals. When liquid passes through the membrane main body 10 in the cavity structure, substances needing to be separated in the liquid enter the central tube 4 by utilizing the reverse osmosis principle, and the separated substances can be discharged through the central tube 4 after entering the central tube 4 along the small holes. Likewise, the liquid component which is not separated by the central tube 4 continues to move with the liquid to the rear seal end cap 1 for discharge. Above-mentioned in-process needs to connect a plurality of reverse osmosis membrane elements and uses, can further promote the filter effect. However, the water inlet direction and the water outlet direction of the existing reverse osmosis membrane element are difficult to determine, so that the plug-in connector 6 and the limiting groove 2 are arranged, the plug-in connector 6 extends into the limiting groove 2 to serve as a guide structure, the plug-in connectors 6 of a plurality of reverse osmosis models and the limiting groove 2 are connected end to ensure that the water inlet and outlet directions of the reverse osmosis membrane element are consistent during installation, the production can be normally carried out, and the reverse osmosis membrane element cannot be damaged.

Therefore, the reverse osmosis membrane element can prevent the problem that the installation direction of the osmosis membrane 102 is wrong, and avoid economic loss caused by wrong installation direction of the osmosis membrane 102.

Referring to fig. 1 and 4, in some embodiments of the present embodiment, a plurality of water inlets 8 are uniformly spaced along the axial direction on the front sealing end cover 5, and adjacent water inlets 8 are communicated with each other.

In this embodiment, a plurality of water inlets 8 are provided on the sealing end cap at even intervals around the axis direction, the adjacent water inlets 8 are communicated with each other, and the provided water inlets 8 can make liquid enter the membrane shell 3 evenly, thereby achieving a better filtering effect.

Referring to fig. 1 and 5, in some embodiments of the present embodiment, a plurality of concentrated water outlets 13 are uniformly spaced around the axis of the rear sealing end cap 1, and adjacent concentrated water outlets 13 are communicated with each other.

In this embodiment, the above-mentioned back seals and is equipped with a plurality of dense water exports 13 on the end cover 1 around the axis direction evenly spaced apart, communicates each other between the adjacent dense water export 13, can make the dense water after carrying out reverse osmosis filtration through membrane main part 10 evenly discharge along dense water export 13, also avoids appearing the inconsistent problem of pressure in the membrane main part 10 simultaneously to promote filterable effect, and can promote the life-span of membrane main part 10.

Referring to fig. 1, in some embodiments of the present invention, a sealing groove is circumferentially formed on the membrane shell 3 located at the front sealing end cover 5 side, and a first annular sealing ring is disposed in the sealing groove.

In this embodiment, the sealing structure formed by the sealing groove and the first sealing ring 12 can seal the dead membrane shell 3 well when the dead membrane shell is located in the outer shell, so that the liquid is prevented from entering the gap between the outer shell and the membrane shell 3, and the liquid is prevented from being discharged from the rear sealing end cover 1 without being filtered along the gap.

Referring to fig. 1 and 2, in some embodiments of the present embodiment, an annular groove is formed on an inner side wall of the limiting groove 2, and a second sealing ring is disposed in the annular groove.

Referring to fig. 1 and 2, in some embodiments of the present embodiment, the annular groove is used to install a second sealing ring, and the second sealing ring is used to realize the sealing connection between the limiting groove 2 of two adjacent reverse osmosis membrane elements and the plug 6, so as to make the central tubes 4 of two adjacent reverse osmosis membrane elements be in sealing connection, and avoid that the filtered liquid enters the membrane main body 10 again along a gap between the two central tubes 4, or the liquid at the membrane main body 10 directly enters the central tube 4 along the gap, thereby causing a problem of poor filtering effect.

Referring to fig. 6, in some embodiments of the present invention, the membrane main body 10 includes a mesh-shaped partition layer 101, a permeable membrane 102 and a mesh layer 103, which are sequentially wrapped, and the mesh-shaped partition layer 101 is sleeved on the central tube 4.

In this embodiment, the mesh-shaped barrier layer 101, the permeable membrane 102 and the mesh layer 103, and the mesh-shaped barrier layer 101, the permeable membrane 102 and the mesh layer 103 may constitute the reverse osmosis membrane 102, and when a dilute solution (e.g., fresh water) and a concentrated solution (e.g., brine) having the same volume are respectively disposed on both sides of the semipermeable membrane, the solvent in the dilute solution will naturally flow toward the concentrated solution side through the semipermeable membrane, which is called osmosis. When the osmosis reaches the balance, the liquid level of the concentrated solution side is higher than the liquid level of the dilute solution by a certain height, namely, a pressure difference is formed, and the pressure difference is the osmotic pressure. The magnitude of the osmotic pressure depends on the inherent properties of the solution, i.e. on the type, concentration and temperature of the concentrated solution and not on the properties of the semipermeable membrane. If a pressure greater than the osmotic pressure is applied to the concentrated solution side, the solvent will flow in the opposite direction to the original direction of osmosis, and will start to flow from the concentrated solution to the dilute solution side, a process known as reverse osmosis. Reverse osmosis, a reverse migration motion of osmosis, is a separation method of separating solutes from a solvent in a solution by selective interception by means of a semipermeable membrane under pressure driving, and has been widely used for purification and concentration of various liquids.

Referring to fig. 6, in some embodiments of the present invention, the mesh layer 103 is provided with a membrane supporting layer 11.

In this embodiment, the membrane support layer 11 is used to support the mesh-like partition layer 101, the permeable membrane 102 and the mesh layer 103, so as to avoid collapse and unevenness.

In some embodiments of the present embodiment, a stress-resistant device (not shown) is disposed at one end of the film body 10 on the rear cap side. The anti-stress device is used for uniformly distributing liquid, and the protective film main body 10 is not punched out and deformed.

In some embodiments of this embodiment, a free end of the plug 6 is provided with a guide head (not shown), and the guide head is a circular truncated cone structure. The guide head can play a role in guiding and guide the plug-in connector 6 to conveniently enter the limiting groove 2.

In some embodiments of this embodiment, the reverse osmosis membrane element has a length of 20 inches and a diameter of 8 inches, and the reverse osmosis membrane element having a length of 506mm is selected to facilitate later use and maintenance and cleaning.

When using, stretch into 2 backs of spacing grooves as guide structure through bayonet joint 6, can guarantee the business turn over water direction unanimity of reverse osmosis membrane element through the end to end of 6 bayonet joints with a plurality of reverse osmosis models and spacing grooves 2 when the installation, guarantee that production can normally go on, can not cause the damage to reverse osmosis membrane element yet.

Example 2

Referring to fig. 3, the present embodiment provides a reverse osmosis membrane 102 assembly, which includes an outer casing 9 and a plurality of reverse osmosis membrane elements, wherein the plurality of reverse osmosis membrane elements are sequentially arranged in the outer casing 9, and in two adjacent reverse osmosis membrane elements, a plug 6 of any one reverse osmosis membrane element extends into a limiting groove 2 of another reverse osmosis membrane element.

In the embodiment, the reverse osmosis membrane 102 assembly can conveniently combine a plurality of permeable membranes 102, and can avoid the condition that the installation direction of the permeable membranes 102 is wrong.

To sum up, the embodiment of the utility model provides a reverse osmosis membrane element and subassembly, this reverse osmosis membrane element include membrane main part 10, center tube 4, membrane shell 3, preceding end cover 5 and the back end cover 1 that seals. The membrane body 10 is a main component for filtering liquid to be filtered, and the liquid is filtered by the reverse osmosis principle. The central tube 4 is used for discharging filtered pure liquid, and the membrane shell 3 is a component for installing the membrane main body 10, and a flow direction channel formed by the component facilitates liquid flow and also prevents liquid from overflowing. The front sealing end cover 5 and the rear sealing end cover 1 are used for sealing two ends of the membrane shell 3, can limit the membrane main body 10 to move along the axis direction, and can facilitate the installation of the central tube 4. The membrane main body 10 and the central tube 4 are located in the membrane shell 3, the membrane main body 10 is sleeved on the central tube 4, the front sealing end cap 5 is arranged at one end of the membrane shell 3, the rear sealing end cap 1 is arranged at the other end of the membrane shell 3, one end of the central tube 4 penetrates through the front sealing end cap 5 and is connected with a plug 6, a limiting groove 2 matched with the plug 6 is formed in the rear sealing end cap 1, the plug 6 can extend into the limiting groove 2, and the limiting groove 2 is communicated with the other end of the central tube 4. Liquid to be filtered enters the membrane shell 3 along the front sealing end cover 5, so that the liquid enters a cavity structure between the central tube 4 and the membrane shell 3, and a plurality of small holes are uniformly arranged on the central tube 4 at intervals. When the liquid passes through the membrane main body 10 in the cavity structure, the substances to be separated in the liquid enter the central tube 4 by utilizing the reverse osmosis principle, and the separated substances can be discharged through the central tube 4 after entering the central tube 4 along the small holes. Likewise, the liquid component which is not separated by the central tube 4 continues to move with the liquid to the rear seal end cap 1 for discharge. Above-mentioned in-process needs to connect a plurality of reverse osmosis membrane elements and uses, can further promote the filter effect. However, the water inlet direction and the water outlet direction of the existing reverse osmosis membrane element are difficult to determine, so that the plug-in connector 6 and the limiting groove 2 are arranged, the plug-in connector 6 extends into the limiting groove 2 to serve as a guide structure, the plug-in connectors 6 of a plurality of reverse osmosis models and the limiting groove 2 are connected end to ensure that the water inlet and outlet directions of the reverse osmosis membrane element are consistent during installation, the production can be normally carried out, and the reverse osmosis membrane element cannot be damaged. Therefore, the reverse osmosis membrane element can prevent the problem that the installation direction of the osmosis membrane 102 is wrong, and avoid economic loss caused by wrong installation direction of the osmosis membrane 102. The utility model provides a reverse osmosis membrane 102 subassembly, including shell body 9 and a plurality of above-mentioned reverse osmosis membrane element, a plurality of above-mentioned reverse osmosis membrane element arrange in above-mentioned shell body 9 in proper order, in two adjacent above-mentioned reverse osmosis membrane element, the bayonet joint 6 of arbitrary reverse osmosis membrane element stretches into in the spacing groove 2 of another reverse osmosis membrane element. The reverse osmosis membrane 102 assembly can be used for combining a plurality of permeable membranes 102 conveniently, and the condition that the installation direction of the permeable membranes 102 is wrong can be avoided.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a reverse osmosis membrane element, its characterized in that, includes membrane main part, center tube, membrane shell, preceding end cover and the back end cover of sealing, the membrane main part with the center tube is located in the membrane shell, the membrane main part cover is established on the center tube, preceding end cover of sealing set up in the one end of membrane shell, back end cover of sealing set up in the other end of membrane shell, the one end of center tube is passed preceding end cover of sealing to be connected with the bayonet joint, back end cover of sealing set up with the spacing groove that the bayonet joint matches, the bayonet joint can stretch into the spacing inslot, the spacing groove with the other end intercommunication of center tube, evenly spaced apart on the center tube is equipped with a plurality of apertures.

2. The reverse osmosis membrane element of claim 1, wherein the forward seal end cap has a plurality of water inlets spaced evenly about the axis, adjacent water inlets being in communication with one another.

3. The reverse osmosis membrane element of claim 1, wherein the rear seal end cap has a plurality of concentrate outlets spaced evenly about the axis, adjacent concentrate outlets being in communication with one another.

4. The reverse osmosis membrane element of claim 1, wherein a sealing groove is circumferentially formed in the membrane shell on the side of the front sealing end cover, and a first annular sealing ring is arranged in the sealing groove.

5. The reverse osmosis membrane element of claim 1, wherein an annular groove is formed in an inner side wall of the limiting groove, and a second sealing ring is arranged in the annular groove.

6. The reverse osmosis membrane element of any one of claims 1-5, wherein the membrane body comprises a mesh-like barrier layer, an osmosis membrane and a mesh layer, which are sequentially wrapped, wherein the mesh-like barrier layer is sleeved on the central tube.

7. The reverse osmosis membrane element of claim 6, wherein a membrane support layer is disposed outwardly of the screen layer.

8. The reverse osmosis membrane element of claim 1, wherein the membrane body on the rear seal end cap side is provided at one end with a stress relief.

9. A reverse osmosis membrane element according to claim 1 wherein the free end of the spigot is provided with a guide tab, the guide tab being of frustoconical configuration.

10. A reverse osmosis membrane module comprising an outer housing and a plurality of reverse osmosis membrane elements according to any one of claims 1 to 9, wherein the plurality of reverse osmosis membrane elements are arranged in the outer housing in sequence, and in two adjacent reverse osmosis membrane elements, a plug connector of any reverse osmosis membrane element extends into a limiting groove of another reverse osmosis membrane element.