Reverse osmosis nanofiltration membrane assembly

Abstract

The utility model discloses a reverse osmosis nanofiltration membrane assembly, and relates to the technical field of water purification and filtration assemblies. The reverse osmosis nanofiltration membrane assembly comprises a reverse osmosis nanofiltration membrane assembly body, the interior of the reverse osmosis nanofiltration membrane assembly body is composed of a filtering unit, the filtering unit is formed by connecting a plurality of sets of membrane shells, center pipes used for circulation are introduced into the multiple sets of membrane shells, and each center pipe located in the middle is symmetrically provided with flow dividing pipelines; a spiral pressure-dividing pipe is communicated in each flow-dividing pipeline, and one end, far away from the middle central pipe, of each spiral pressure-dividing pipe is connected with a branch central pipe. According to the utility model, the partial pressure of the middle central pipe in wastewater treatment is completed by utilizing the spiral partial pressure pipe communicated with the middle central pipe and the branch central pipe, so that the pressure between the O-shaped ring and the groove is reduced while the wastewater filtering flow rate is improved, the condition of permeation or looseness is avoided, and the sealing performance of the whole assembly is further ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification filtration components, in particular to a reverse osmosis nanofiltration membrane module. Background Technique

[0002] The existing reverse osmosis membrane filtration structure mainly includes a central tube and membrane elements wound around the central tube. In recent years, the country's requirements for water purifiers have gradually increased, requiring a reduction in the wastewater discharge of water purifiers, which has led to an increase in the recovery rate of membrane elements. China has a vast territory and complex water quality. In areas with poor water quality, the membrane elements will quickly scale and become blocked. After scaling and blocking, they need to be replaced to ensure the quality of pure water, which has led to an increase in water usage costs.

[0003] For example, a reverse osmosis and nanofiltration membrane module disclosed in Chinese Patent Publication No. CN214780922U. In the case of reducing the wastewater flow rate and increasing the recovery rate, due to the series connection of multiple filtration units, the recovery rate evenly distributed to each membrane module is relatively low. This enables the entire membrane module to operate at a relatively high recovery rate, can also achieve better water quality, and can slow down the membrane scaling situation and reduce the replacement cost.

[0004] The above device is provided with multiple groups of central tubes, and the filtration of wastewater mainly occurs in the filter elements wound outside the central tubes. The result of this is that the filtration of wastewater needs to flow through several groups of central tubes and the filter elements outside several groups of central tubes, thereby slowing down the flow rate of wastewater. Moreover, the middle suction pipe located in the middle of the entire component is affected by the water flow at both ends, and its pressure cannot be divided, resulting in the non-tight fit between the double O-rings on the pipe and the grooves, affecting the sealing performance. Content of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the utility model provides a reverse osmosis nanofiltration membrane module, which solves the problems raised in the above background technique.

[0006] To achieve the above purposes, the utility model is realized through the following technical solutions: A reverse osmosis nanofiltration membrane module, including a reverse osmosis nanofiltration membrane module. The interior of the reverse osmosis nanofiltration membrane module is composed of filtration units. The filtration units are connected by several groups of membrane shells, and a central tube for circulation is introduced into each of the several groups of membrane shells. Each central tube located in the middle is symmetrically provided with a shunt pipeline, and a spiral pressure-dividing tube is connected in each shunt pipeline. One end of each spiral pressure-dividing tube far from the middle central tube is connected to a branch central tube.

[0007] Preferably, the number of shunt pipes is determined according to the actual wastewater treatment volume. This reverse osmosis nanofiltration membrane module uses a spiral pressure-dividing pipe connected by a central pipe in the middle and a branch central pipe to complete the pressure division of the central pipe in the middle during wastewater treatment, improving the wastewater filtration flow rate while reducing the pressure between the O-ring and the groove, avoiding the occurrence of penetration or loosening, and further ensuring the sealing performance of the overall module.

[0008] A further improvement of the technical solution of the present utility model is that filter elements wound around the outer tube are provided in both of the central pipes at both ends, and filter elements wound inside the tubes are provided in each of the central pipes in the middle and the branch central pipes.

[0009] Particularly, the central pipe and the branch central pipe in the middle will not overflow wastewater, and the transmitted wastewater is directly transferred to the next group of central pipes, increasing the wastewater flow rate and improving the wastewater treatment efficiency.

[0010] A further improvement of the technical solution of the present utility model is that double O-rings of the pipe type are provided on the inner wall of the membrane housing at both ends of the filtering unit. Each double O-ring of the pipe type is installed in an O-ring groove opened on the filter element wound around the outer tube of the central pipe. An O-ring groove connected to the double O-ring of the pipe type is provided in each of the central pipes in the middle.

[0011] Preferably, to ensure the reverse osmosis and sealing performance of the central pipe in the middle, an O-ring groove connected to the double O-ring of the pipe type is provided in the central pipe in the middle for connecting the double O-ring, and due to the pressure division, the uneven pressure is avoided.

[0012] A further improvement of the technical solution of the present utility model is that the number of the membrane housings is at least one, and a water outlet channel is connected to the outside of the last membrane housing.

[0013] A further improvement of the technical solution of the present utility model is that a plurality of groups of filter holes are provided on the central pipes at both ends of the filtering unit, and sealing members are provided at the connection parts with the membrane housing. Preferably, the selection of the sealing member ensures the sealing performance of the inlet and outlet water.

[0014] A further improvement of the technical solution of the present utility model is that the inner diameter of the central pipes at both ends of the filtering unit is larger than that of the central pipe in the middle, and O-ring grooves are provided on both ends of the central pipes at both ends. Connection rings matching the O-ring grooves are provided at both ends of the central pipe in the middle. The adjacent membrane housings in the filtering unit are connected front and back by threads.

[0015] Beneficial effects

[0016] The present utility model provides a reverse osmosis nanofiltration membrane module. Compared with the prior art, it has the following beneficial effects:

[0017] This reverse osmosis nanofiltration membrane module uses a spiral pressure-dividing pipe and a branch central pipe connected by a central pipe in the middle to complete the pressure division of the central pipe in wastewater treatment, improving the filtration flow rate of wastewater while reducing the pressure between the O-ring and the groove, avoiding penetration or loosening, and further ensuring the sealing of the overall module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the whole of the present utility model;

[0019] Figure 2 is a side view structural diagram of the filtration unit of the present utility model;

[0020] Figure 3 is a schematic diagram of the connection of multiple groups of central pipes of the present utility model;

[0021] In the figure: 1, reverse osmosis nanofiltration membrane module; 201, membrane housing; 202, central pipe; 203, shunt pipeline; 204, spiral pressure-dividing pipe; 205, branch central pipe; 206, filter element; 207, double O-ring for pipes; 208, filter holes; 209, seal; 210, O-ring groove; 3, water outlet channel. SPECIFIC EMBODIMENTS

[0022] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0023] The present utility model provides two technical solutions:

[0024] Figures 1-3 The first embodiment is shown: A reverse osmosis nanofiltration membrane module includes a reverse osmosis nanofiltration membrane module 1. The interior of the reverse osmosis nanofiltration membrane module 1 is composed of filtration units. The filtration units are connected by a plurality of groups of membrane housings 201, and a central pipe 202 for circulation is introduced into each of the plurality of groups of membrane housings 201. Each central pipe 202 located in the middle is symmetrically provided with a shunt pipeline 203. A spiral pressure-dividing pipe 204 is connected in each shunt pipeline 203, and one end of each spiral pressure-dividing pipe 204 away from the central pipe 202 in the middle is connected to a branch central pipe 205.

[0025] The number of the diversion pipelines 203 is determined according to the actual wastewater treatment volume. This reverse osmosis nanofiltration membrane module uses the spiral pressure-dividing pipe 204 connected by the middle central pipe 202 and the branch central pipe 202 to complete the pressure division of the middle central pipe 202 in wastewater treatment, which can improve the wastewater filtration flow rate while reducing the pressure between the O-ring and the groove, avoiding the occurrence of penetration or loosening, and further ensuring the sealing performance of the overall module.

[0026] Filter elements 206 wound around the outer wall of the pipe are arranged in both of the central pipes 202 at the two ends, and filter elements 206 wound inside the pipe are arranged in each of the middle central pipes 202 and the branch central pipes 205.

[0027] Particularly, the central pipe 202 and the branch central pipe 205 in the middle will not overflow wastewater, and the transmitted wastewater is directly transferred into the next group of central pipes 202, which can increase the wastewater flow rate and improve the wastewater treatment efficiency.

[0028] Double O-rings of pipe type are arranged on the inner wall of the membrane housing 201 at both ends of the filtration unit. Each double O-ring 207 of pipe type is installed in the O-ring groove opened on the filter element 206 wound around the outer wall of the central pipe 202, and an O-ring groove connected with the double O-ring of pipe type is arranged in each middle central pipe 202.

[0029] Preferably, to ensure the reverse osmosis and sealing performance of the middle central pipe 202, an O-ring groove connected with the double O-ring of pipe type is arranged in the middle central pipe 202 to connect the double O-ring, and the uneven pressure is avoided due to pressure division.

[0030] Figures 2-3 The second embodiment is shown. The main difference from the first embodiment is that the number of the membrane housings 201 is at least 3, and a water outlet channel 3 is connected to the outer side of the end membrane housing 201.

[0031] A number of groups of filter holes 208 are opened on the central pipes 202 at both ends of the filtration unit, and sealing members 209 are arranged at the connection parts with the membrane housings 201. The selection of the sealing members 209 is to ensure the sealing performance of the inlet and outlet water.

[0032] The inner diameter of the central pipes 202 at both ends of the filtration unit is larger than that of the middle central pipe 202, and O-ring grooves 210 are arranged on the central pipes 202 at both ends. Connection rings matching the O-ring grooves 210 are arranged at both ends of the middle central pipe 202. The adjacent membrane housings 201 in the filtration unit are connected in series by threads.

[0033] Meanwhile, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited, and conventional equipment can be used.

[0034] During the wastewater filtration process, the wastewater enters the central tube 202 through one end of the membrane housing connected by a seal, and escapes from the central tube 202. During the escape process, it passes through the filter element 206 wound outside the central tube 202 and enters the next set of central tubes 202 in the middle. And it is shunted in the central tube 202 in the middle. Part of the wastewater flows into the shunt pipelines 203, spiral pressure-dividing tubes 204 and branch central tubes 205 provided at both ends, and is filtered again by the filter element 206 provided therein. Finally, it enters the next filtration unit until it enters the water outlet channel and is discharged. Therefore, the user can adjust the number of membrane housings 201 and the corresponding central tubes 202 in the filtration unit according to actual needs and the quality of the water itself. And because the connections between the membrane housings 201 are all spiral connections, when cleaning the dirt, only the corresponding central tube 202 or the entire membrane housing 201 and its internal components need to be replaced.

[0035] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0036] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A reverse osmosis nanofiltration membrane assembly, characterized in that: The invention comprises a reverse osmosis nanofiltration membrane assembly (1), wherein the reverse osmosis nanofiltration membrane assembly (1) is internally composed of a filtration unit, wherein the filtration unit is composed of a plurality of groups of membrane shells (201) connected to each other, and a central tube (202) for circulation is passed through each of the plurality of groups of membrane shells (201), and each central tube (202) located in the middle is symmetrically provided with a branch pipe (203), and each of the branch pipes (203) is connected to a spiral pressure dividing pipe (204), and each of the spiral pressure dividing pipes (204) is connected to a branch central pipe (205) at one end away from the central tube (202) in the middle.

2. A reverse osmosis nanofiltration membrane assembly according to claim 1, characterized in that: The central tubes (202) at both ends are provided with filter cores (206) wound outside the tube body, and each of the middle central tube (202) and the branch central tube (205) is provided with a filter core (206) wound inside the tube.

3. A reverse osmosis nanofiltration membrane assembly according to claim 1, characterized in that: The inner wall of the membrane shell (201) located at both ends of the filter unit is provided with a double O-ring for a tube, and each of the double O-ring for a tube (207) is installed in an O-groove opened on the outer filter element (206) of the central tube (202) wound around it, and each of the middle central tubes (202) is provided with an O-groove connected to the double O-ring for a tube.

4. A reverse osmosis nanofiltration membrane assembly according to claim 1, characterized in that: The number of the membrane shells (201) is at least three and the ends of the membrane shells (201) are externally connected to a water outlet channel (3).

5. A reverse osmosis nanofiltration membrane assembly according to claim 1, characterized in that: A plurality of groups of filter holes (208) are provided on the central tube (202) located at both ends of the filter unit, and sealing members (209) are provided at the connection points with the membrane shell (201).

6. A reverse osmosis nanofiltration membrane assembly according to claim 1, characterized in that: The inner diameter of the central tube (202) at both ends of the filter unit is larger than that of the middle central tube (202), and O-shaped grooves (210) are provided on the central tubes (202) at both ends. Connecting rings matching the O-shaped grooves (210) are provided at both ends of the middle central tube (202), and adjacent membrane shells (201) in the filter unit are connected front and back through threads.

Images