Flat sheet membrane assembly

Abstract

The utility model relates to a flat sheet membrane component, which comprises a frame, a water collecting pipe arranged on one side of the frame and a plurality of flat sheet membrane elements arranged in the frame, each flat sheet membrane element comprises a support plate and membranes respectively arranged on the front end face and the rear end face of the support plate, and the support plate is provided with at least one water outlet. The water outlet is located in one side of the supporting plate and communicates with the water collecting pipe. The water outlet of the flat sheet membrane element is positioned on one side of the supporting plate and is directly communicated with the water collecting pipe, so that a water production path is shortened, pipe loss is reduced, increase of transmembrane pressure difference is effectively relieved, and water production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of water treatment, and more specifically to a flat membrane component. Background Art

[0002] Flat membrane modules are used in membrane bioreactors (MBRs), and flat membrane modules are the core components of the MBRs. The Chinese patent with the publication number "CN213294836U" discloses a flat membrane module, wherein the flat membrane module includes a membrane box, a water collecting pipe installed on one side of the membrane box, and a flat membrane element installed in the membrane box. The flat membrane element includes a support plate and a diaphragm fixed on the support plate. The top of the support plate is provided with a water outlet, and all the water outlets are connected to the water collecting pipe through a connecting pipe. The liquid flows out from the water outlet after passing through the diaphragm and then flows out through the water collecting pipe.

[0003] However, in the above technical solution, the flat membrane element produces water from the top. Since the filtered water needs to flow to the water collecting pipe through a connecting pipe, the water production path of the membrane component is long, the pipe loss is large, and the transmembrane pressure difference is easily increased, affecting the water production efficiency. Utility Model Content

[0004] The utility model provides a flat membrane assembly to overcome the problem of water production at the top of the flat membrane in the prior art. The flat membrane adopts a lateral water production structure to solve the problem of water production at the top of the flat membrane.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a flat membrane assembly, including a frame, a water collecting pipe installed on one side of the frame and a plurality of flat membrane elements installed in the frame, each of the flat membrane elements includes a support plate and a diaphragm installed on the front and rear end surfaces of the support plate respectively, the support plate is provided with at least one water outlet, the water outlet is located on one side of the support plate and the water outlet is connected to the water collecting pipe.

[0006] In the above technical solution, the water collecting pipe will provide suction negative pressure through an externally connected negative pressure providing device, so that the liquid will be filtered at the membranes on the front and rear ends of the support plate. The filtered filtrate enters between the two membranes, and then flows out from the water outlet under the action of the suction negative pressure and enters the water collecting pipe, and is discharged from the water collecting pipe.

[0007] Since the water outlet and the water collecting pipe are both located on one side, the water outlet can be directly connected to the water collecting pipe, so that the filtrate flows directly into the water collecting pipe after flowing out of the water outlet, without passing through a connecting pipe or other connection methods, shortening the flow path of the filtrate, making the water production path the shortest, reducing pipe losses, and effectively alleviating the increase in transmembrane pressure difference.

[0008] Preferably, at least two water outlets are provided along the height direction of the support plate and are evenly distributed. After the water outlets are evenly distributed, the suction negative pressure that the diaphragm can withstand in the height direction can be more uniform. Since the width of the diaphragm is smaller than the height direction, the diaphragm can more easily withstand the negative pressure evenly in the width direction. Preferably, the width of the support plate is less than 500 mm, and the width of the support plate is within this range, and the suction negative pressure that the diaphragm can withstand in the width direction can be more uniform. After the diaphragm can withstand the negative pressure evenly in both the height and width directions, the flux at each position of the diaphragm remains basically constant, and there is no difference in the local water production flux, which effectively alleviates the fouling of the diaphragm and extends the chemical cleaning cycle of the diaphragm, thereby reducing the operation and maintenance cost.

[0009] Preferably, it comprises a first side plate, a second side plate and a connecting piece connecting the first side plate and the second side plate, the first side plate and the second side plate are both provided with a slot for engaging with the support plate; the water collecting pipe is installed on the outer surface of the first side plate and is connected with the slot of the first side plate. One side of the support plate provided with a water outlet is installed in the slot of the first side plate, and the other side is installed in the slot of the second side plate. The support plate is fixed by the slot, which can facilitate the installation and removal of the flat membrane element. In addition, after the support plate is installed, the water outlet can be directly connected with the water collecting pipe through the slot.

[0010] Preferably, the water collecting pipe includes a plurality of branch pipes and a main pipe connected to the branch pipes, the branch pipes are connected to the water outlets at the same height of each of the support plates and the number of the branch pipes is consistent with the number of the water outlets on each of the support plates; the axis of the main pipe is perpendicular to the axis of the branch pipes. The flat membrane elements are arranged horizontally in the frame, so the branch pipes connecting the water outlets on each support plate are also arranged horizontally, while the main pipe connecting all the branch pipes is arranged vertically. When the main pipe is arranged vertically, the stored chemicals can have a higher liquid level in the vertical pipe than when placed horizontally, so that the chemicals can be more evenly recoiled onto the membrane, resulting in a better flushing effect.

[0011] Preferably, the frame is provided with spacers between adjacent flat membrane elements, and the spacers can further maintain a certain distance between the flat membrane elements.

[0012] Preferably, both the first side plate and the second side plate are provided with mounting grooves, and the partition is installed in the mounting grooves.

[0013] Preferably, the top surface and / or the side surface of the frame are provided with a wedge, and the wedge is used to connect two frames. A plurality of flat membrane modules can be assembled and stacked through the wedge.

[0014] Preferably, the diaphragm is made of PE material, and the diaphragm is sealed and connected to the support plate. The diaphragm made of PE material does not need to be supported by non-woven fabric, and can be directly connected to the support plate by sealing connection methods such as welding or pasting. When replacing, the diaphragm can be directly removed from the support plate and replaced with a new one, which is convenient for replacing the diaphragm.

[0015] Preferably, the diaphragm is a porous polyethylene film, and the support plate is made of PE material, and the two can be directly sealed and connected by high-frequency welding.

[0016] Compared with the prior art, the beneficial effects of the utility model are: the water outlet of the flat membrane element is located on one side of the support plate and is directly connected to the water collecting pipe, shortening the water production path, reducing pipe loss, effectively alleviating the increase in transmembrane pressure difference, and improving water production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of a flat membrane assembly of the utility model;

[0018] Figure 2 It is an exploded diagram of the flat membrane element of the utility model;

[0019] Figure 3 This is a structural schematic diagram of the support plate of the utility model;

[0020] Figure 4 It is a side view structural schematic diagram of a flat membrane assembly of the utility model;

[0021] Figure 5 for Figure 4 Cross-sectional view in the AA direction;

[0022] Figure 6 for Figure 5 A local enlarged view of point A;

[0023] Figure 7 It is a front view structural schematic diagram of a flat membrane component of the utility model. Description of the drawings:

[0025] 1-frame; 101-connecting piece; 102-first side plate; 103-second side plate; 104-slot; 2-water collecting pipe; 3-flat membrane element; 301-support plate; 302-diaphragm; 3011-water outlet; 4-partitioning piece; 5-clamping part; 6-claw part. DETAILED DESCRIPTION

[0026] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0027] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0030] Example 1

[0031] like Figure 1-2 The figure shows an embodiment 1 of a flat membrane assembly, comprising a frame 1, a water collecting pipe 2 installed on one side of the frame 1 and a plurality of flat membrane elements 3 installed in the frame 1, each flat membrane element 3 comprising a support plate 301 and a diaphragm 302 respectively installed on the front and rear end surfaces of the support plate 301, the support plate 301 is provided with at least one water outlet 3011, the water outlet 3011 is located on one side of the support plate 301 and the water outlet 3011 is connected to the water collecting pipe 2.

[0032] The working principle or workflow of this embodiment is as follows: the water collecting pipe 2 will provide suction negative pressure through an external negative pressure providing device such as a water pump, so that the liquid will be filtered at the diaphragms 302 on the front and rear end surfaces of the support plate 301, and the filtered filtrate enters between the two diaphragms 302, and then flows out from the three water outlets 3011 under the action of the suction negative pressure and enters the water collecting pipe 2, and is discharged from the water collecting pipe 2.

[0033] The beneficial effects of this embodiment are as follows: since the water outlet 3011 and the water collecting pipe 2 are located on the same side, the water outlet 3011 can be directly connected to the water collecting pipe 2, so that the filtrate flows directly into the water collecting pipe 2 after flowing out from the water outlet 3011, without passing through a connecting pipe or other connection methods, thereby shortening the flow path of the filtrate, making the water production path as short as possible, reducing pipe loss, effectively alleviating the increase in transmembrane pressure difference, and improving water production efficiency.

[0034] Example 2

[0035] like Figure 1-6 The embodiment 2 of a flat membrane assembly is shown, comprising a frame 1, a water collecting pipe 2 installed on one side of the frame 1, and a plurality of flat membrane elements 3 installed in the frame 1, each of which comprises a support plate 301 and a membrane sheet 302 respectively installed on the front and rear end surfaces of the support plate 301. The support plate 301 is provided with at least one water outlet 3011, which is located on one side of the support plate 301 and is connected to the water collecting pipe 2.

[0036] Among them, at least two water outlets are arranged along the height direction of the support plate 301 and are evenly distributed. In this embodiment, three water outlets 3011 are arranged, which are respectively located at the top, bottom and middle of the support plate 301. The suction negative pressure given to the diaphragm 302 by the three water outlets 3011 is consistent in the height direction, so that the suction negative pressure borne by the diaphragm 302 in the height direction can be more uniform. Furthermore, the width of the support plate 301 is less than 500 mm. When the width of the support plate 301 is within this range, the suction negative pressure borne by the diaphragm 302 in the width direction can be more uniform. After the diaphragm 302 can evenly withstand the negative pressure in both the height direction and the width direction, the flux at each position of the diaphragm 302 is maintained basically constant.

[0037] Specifically, the frame 1 includes a first side plate 102, a second side plate 103 and a connector 101 connecting the first side plate 102 and the second side plate 103. The first side plate 102 and the second side plate 103 are both provided with a slot 104 for engaging with the support plate 301. In this embodiment, the connector 101 is a rod-shaped member, connecting the four end corners of the first side plate 102 and the second side plate 103; the water collecting pipe 2 is installed on the outer surface of the first side plate 102 and communicated with the slot 104 of the first side plate 102. The support plate 301 is provided with a water outlet 3011 on one side thereof, which is installed in the slot 104 of the first side plate 102, and the other side thereof is installed in the slot 104 of the second side plate 103. The support plate 301 is fixed by the slot 104, which can facilitate the installation and removal of the flat membrane element 3. In addition, after the support plate 301 is installed, the water outlet 3011 can be directly communicated with the water collecting pipe 2 through the slot 104. In this embodiment, the slot 104 is provided with a flared structure at the end to facilitate the installation of the flat membrane element 3 .

[0038] In this embodiment, the water collecting pipe 2 includes a plurality of branch pipes 201 and a main pipe 202 connected to the branch pipes 201. The branch pipes 201 are connected to the water outlets 3011 at the same height of each support plate 301 and the number of the branch pipes 201 is consistent with the number of the water outlets 3011 on each support plate 301. In this embodiment, three branch pipes 201 are provided, and the three corresponding water outlets 3011 are located at the top, the bottom and the middle; the axis of the main pipe 202 is perpendicular to the axis of the branch pipes 201. The flat membrane elements 3 are arranged in the horizontal direction in the frame 1, so the branch pipes 201 connecting the water outlets 3011 on each support plate 301 are also arranged in the horizontal direction, while the main pipe 202 connecting all the branch pipes 201 is arranged in the vertical direction. When the main pipe 202 is arranged in the vertical direction, the stored chemical agent can have a higher liquid level in the vertical pipe than when it is placed horizontally, so that the chemical agent can be more evenly backwashed onto the membrane 302, and the flushing effect is better.

[0039] Furthermore, both the first side plate 102 and the second side plate 103 are provided with mounting grooves, and the mounting grooves are provided with separators 4 for maintaining a certain interval between the flat membrane elements 3. In this embodiment, the separators 4 are made of silica gel.

[0040] The working principle or workflow of this embodiment: the first side plate 102 and the second side plate 103 are both provided with a plurality of slots 104, and the flat membrane element 3 is installed between the first side plate 102 and the second side plate 103 through the slots 104. The slots 104 have a certain limiting effect on the flat membrane element, so that adjacent flat membrane elements 3 are kept at a certain interval. By providing mounting slots on both the first side plate 102 and the second side plate 103, and installing the separator 4 in the mounting slots, the effect of keeping the flat membrane elements 3 at a certain interval can be further enhanced.

[0041] After the installation of the flat membrane element 3 is completed, a negative pressure providing device, such as a water pump, will be installed at the water collecting pipe 2 to provide suction negative pressure. The generated negative pressure allows the liquid to pass through the diaphragm 302 on the front and rear ends of the support plate 301 and the diaphragm 302 retains impurities. Under the action of the suction negative pressure, the filtered filtrate flows out from the three water outlets 3011 respectively and enters the water collecting pipe 2, and is discharged from the water collecting pipe 2.

[0042] Beneficial effects of this embodiment: Since the water outlet 3011 and the water collecting pipe 2 are both located on one side, the water outlet 3011 can be directly connected to the water collecting pipe 2, so that the filtrate flows directly into the water collecting pipe 2 after flowing out of the water outlet 3011, without passing through a connecting pipe or other connection methods, shortening the flow path of the filtrate, making the water production path the shortest, reducing pipe loss, effectively alleviating the increase in transmembrane pressure difference, and improving water production efficiency. After the diaphragm 302 can evenly withstand negative pressure in the height direction and the width direction, the flux at each position of the diaphragm 302 remains basically constant, and there is no difference in local water production flux, which effectively alleviates the fouling of the diaphragm and extends the chemical cleaning cycle of the diaphragm 302, thereby reducing operation and maintenance costs.

[0043] Example 3

[0044] Embodiment 3 of a flat membrane assembly is based on embodiment 1 or embodiment 2, and is different from embodiment 1 or embodiment 2 in that: Figure 4 and Figure 7 As shown, the outer surface of the frame 1 is provided with a wedging notch.

[0045] Specifically, the wedging includes a clamping portion 5 provided on the bottom surface and one end surface of the first side plate 102 and the second side plate 103, and a claw portion 6 provided on the top surface and the other end surface of the first side plate 102 and the second side plate 103. When assembling, multiple flat membrane modules can be stacked in the vertical direction or in the horizontal direction through the cooperation of the claw portion 6 and the clamping portion 5.

[0046] The rest of the working principles and effects of this embodiment are consistent with those of Embodiment 1 or Embodiment 2.

[0047] Example 4

[0048] Embodiment 4 of a flat membrane assembly is based on any of the above embodiments, and differs from any of the above embodiments in that the diaphragm 302 is made of PE material, and the diaphragm 302 is sealed and connected to the support plate 301.

[0049] Specifically, the membrane 302 is a porous polyethylene membrane, specifically a lithium battery separator, and the support plate 301 is made of PE material. The two can be directly sealed and connected by high-frequency welding.

[0050] Beneficial effects of this embodiment: The diaphragm 302 of this embodiment does not need to be supported by non-woven fabric, and can be directly connected to the support plate 301 through a sealing connection method such as welding or bonding. When replacing, the diaphragm 302 can be directly removed from the support plate 301 and replaced with a new diaphragm 302, which facilitates the replacement of the diaphragm 302.

[0051] The remaining features and working principles of this embodiment are consistent with any of the above embodiments.

[0052] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A flat membrane assembly, comprising a frame (1), a water collecting pipe (2) installed on one side of the frame (1), and a plurality of flat membrane elements (3) installed in the frame (1), each of the flat membrane elements (3) comprising a support plate (301) and a membrane sheet (302) respectively installed on the front and rear end surfaces of the support plate (301), the support plate being provided with at least one water outlet (3011), characterized in that: The water outlet is located on one side of the support plate (301) and the water outlet (3011) is connected to the water collecting pipe (2).

2. A flat membrane module according to claim 1, characterized in that: At least two water outlets (3011) are arranged along the height direction of the support plate (301) and are distributed at equal distances.

3. A flat membrane module according to claim 2, characterized in that: The width of the support plate (301) is less than 500 mm.

4. A flat membrane module according to claim 1, characterized in that: The frame (1) comprises a first side plate (102), a second side plate (103) and a connecting piece (101) connecting the first side plate (102) and the second side plate (103); the first side plate (102) and the second side plate (103) are both provided with a slot (104) for engaging with the support plate (301); the water collecting pipe (2) is installed on the outer surface of the first side plate (102) and is connected to the slot (104) of the first side plate (102).

5. A flat membrane module according to claim 4, characterized in that: The water collecting pipe (2) comprises a plurality of branch pipes (201) and a main pipe (202) connected to the branch pipes (201); the branch pipes (201) are connected to the water outlets (3011) at the same height of each support plate (301) and the number of the branch pipes (201) is consistent with the number of the water outlets (3011) on each support plate (301); the axis of the main pipe (202) is perpendicular to the axis of the branch pipes (201).

6. A flat membrane module according to claim 4, characterized in that: The frame (1) is provided with spacers (4) between adjacent flat membrane elements (3).

7. A flat membrane module according to claim 6, characterized in that: The first side plate (102) and the second side plate (103) are both provided with mounting grooves, and the partition (4) is mounted in the mounting grooves.

8. A flat membrane module according to any one of claims 1 to 7, characterized in that: The outer surface of the frame (1) is provided with a wedge, and the wedge is used to connect two frames (1).

9. A flat membrane module according to any one of claims 1 to 7, characterized in that: The diaphragm (302) and the support plate (301) are both made of PE material, and the diaphragm (302) and the support plate (301) are sealed and connected.

10. A flat membrane module according to claim 9, characterized in that: The membrane (302) is a porous polyethylene membrane.

Images