Membrane element protection device in shutdown period of nanofiltration membrane system

Abstract

The utility model belongs to the technical field of nanofiltration membranes, and discloses a nanofiltration membrane system shutdown period membrane element protection device which comprises a membrane element body arranged in a filter cartridge, the bottom of the filter cartridge is provided with a liquid inlet pipe and a liquid outlet pipe, the side wall of the liquid inlet pipe and the side wall of the liquid outlet pipe are provided with control valves respectively, and the control valves are connected with the membrane element body. The air suction pump is arranged at the top of the filter cartridge; and the air suction end of the air suction pump is connected with the interior of the filter cartridge through a connecting pipe. According to the membrane element protection device in the shutdown period of the nanofiltration membrane system, through the arrangement of the protection mechanism, under the driving action of the driving mechanism, in the process that the air in the filter cartridge is exhausted by the sucking pump, the surface deformation of the membrane element body is detected; therefore, deformation and damage of the membrane element body caused by excessive discharge of air under the condition of negative pressure are avoided, and the protection safety of the membrane element body is improved while the protection effect of the membrane element body is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of nanofiltration membranes, in particular to a membrane element protection device during shutdown of a nanofiltration membrane system. Background Art

[0002] When protecting the membrane elements during the shutdown of the nanofiltration membrane system, first, the membrane elements are thoroughly cleaned to remove possible contaminants. After cleaning, the membrane elements are immersed in 1-1.5% SMBS protective solution, and the pH value of the protective solution is checked once a week to ensure that it is within the appropriate range.

[0003] During the process of cleaning and soaking the membrane elements during the shutdown of the nanofiltration membrane system, in order to avoid the air in the container from contacting with the protective liquid, causing oxidation or deterioration of certain chemical components and forming bubbles on the surface of the membrane elements, which hinders the sufficient contact between the protective liquid and the surface of the membrane elements, the air in the container needs to be discharged. When discharging the air in the container, a circulating pump or other equipment is often used to achieve this. Although the effect of discharging the air in the container is guaranteed, since the discharge amount of the air in the container cannot be accurately controlled, it is easy to cause excessive discharge of the air in the container, thereby causing the membrane elements to be damaged due to large deformation under negative pressure, thereby reducing the safety of membrane element protection. At the same time, if the discharge amount is too small, it will affect the protection effect of the membrane elements. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a membrane element protection device during shutdown of a nanofiltration membrane system.

[0005] The above technical purpose of the utility model is achieved through the following technical scheme: a membrane element protection device during the shutdown of a nanofiltration membrane system, comprising a membrane element body arranged in a filter cartridge, a liquid inlet pipe and a liquid outlet pipe are respectively provided at the bottom of the filter cartridge, and control valves are respectively provided on the side walls of the liquid inlet pipe and the liquid outlet pipe, and also includes an air pump arranged on the top of the filter cartridge, the suction end of the air pump is connected to the interior of the filter cartridge through a connecting pipe, and a protective mechanism is provided in the filter cartridge for protecting the membrane element body during the exhaust process.

[0006] By adopting the above technical solution, it is convenient to discharge the air inside the filter cartridge.

[0007] Furthermore, the protective mechanism includes a protective ring slidably connected in the filter cartridge, the protective ring is concentrically arranged with the membrane element body, a plurality of protective tubes are fixedly connected to one side of the protective ring close to the membrane element body, each of the protective tubes is slidably connected to a protective rod, one end of each of the protective rods located inside the protective tube is fixedly connected to a protective plate, the other end of each of the protective rods is rotatably connected to a rotating ball, a distance sensor is provided on the bottom wall of each of the protective tubes, the distance sensor is electrically connected to the vacuum pump through a controller, and a driving mechanism for driving the protective ring is provided on the filter cartridge.

[0008] By adopting the above technical solution, the protection effect of the membrane element body is guaranteed while the safety of the protection of the membrane element body is improved.

[0009] Furthermore, each of the protection rods is sleeved with a spring on the side wall inside the protection tube, and two ends of the spring are respectively connected to the inner wall of the protection tube and the protection plate.

[0010] By adopting the above technical solution, the membrane element body is deformed, and the rotating ball drives the protective plate to move closer to the membrane element body under the action of the spring.

[0011] Furthermore, the interior of the protective ring is hollow, and a plurality of counterweights are arranged in the hollow space.

[0012] By adopting the above technical solution, the protective ring can slide in the filter cartridge under the action of gravity.

[0013] Furthermore, the driving mechanism includes a winding drum arranged on the top of the filter cartridge, a pull rope is wound inside the winding drum, one end of the pull rope passes through the filter cartridge and is connected to the protective ring.

[0014] By adopting the above technical solution, it is convenient to drive the protective ring to slide in the filter cartridge.

[0015] Furthermore, two driving mechanisms are provided, and the two driving mechanisms are symmetrically arranged with each other. The filter cartridge is provided with a linkage component for linking the two driving mechanisms.

[0016] By adopting the above technical solution, the stability of pulling the protective ring can be improved.

[0017] Furthermore, the linkage assembly includes two symmetrically arranged fixing plates fixedly connected to the top of the filter cartridge, a linkage rod is rotatably connected between the two fixing plates, and the two winding drums are fixedly connected to the side walls of the linkage rod.

[0018] By adopting the above technical solution, the two winding drums can be driven to rotate synchronously.

[0019] Furthermore, a motor is provided on one of the two fixing plates, and an output end of the motor is connected to the linkage rod.

[0020] By adopting the above technical solution, it is convenient to drive the linkage rod to rotate.

[0021] In summary, the utility model has the following beneficial effects:

[0022] The membrane element protection device during the shutdown of the nanofiltration membrane system in the present application, through the setting of the protection mechanism, under the driving action of the driving mechanism, during the process of the vacuum pump discharging the air inside the filter cartridge, detects the deformation of the surface of the membrane element body, so as to avoid deformation and damage of the membrane element body under negative pressure due to excessive discharge of air, thereby ensuring the protection effect of the membrane element body while improving the safety of the protection of the membrane element body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0024] Figure 2 This is a schematic diagram of the internal structure of the filter cartridge of an embodiment of the utility model;

[0025] Figure 3 yes Figure 2 The enlarged schematic diagram of point A in the middle;

[0026] Figure 4 It is a schematic diagram of the internal structure of the protection mechanism of an embodiment of the utility model;

[0027] Figure 5 yes Figure 4 A magnified schematic diagram of point B in the middle.

[0028] In the figure: 101, filter cartridge; 102, membrane element body; 103, liquid inlet pipe; 104, liquid outlet pipe; 105, control valve; 2, vacuum pump; 3, connecting pipe; 401, protective ring; 402, protective pipe; 403, protective rod; 404, protective plate; 405, distance sensor; 406, rotating ball; 407, spring; 501, winding drum; 502, pull rope; 601, fixing plate; 602, linkage rod; 603, motor. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0030] Example 1

[0031] See also Figure 1-Figure 5 , a membrane element protection device during shutdown of a nanofiltration membrane system shown in the figure, comprising a membrane element body 102 arranged in a filter cartridge 101, a liquid inlet pipe 103 and a liquid outlet pipe 104 are respectively arranged at the bottom of the filter cartridge 101, and control valves 105 are respectively arranged on the side walls of the liquid inlet pipe 103 and the liquid outlet pipe 104, and also comprising an air pump 2 arranged on the top of the filter cartridge 101, the air suction end of the air pump 2 is connected to the inside of the filter cartridge 101 through a connecting pipe 3, and a protective mechanism for protecting the membrane element body 102 during the exhaust process is arranged in the filter cartridge 101;

[0032] It should be noted here that the air inside the filter cartridge 101 can be easily discharged by providing the vacuum pump 2 .

[0033] It is worth noting that as existing technologies, the specific structure and working principle of the nanofiltration membrane system and its membrane elements have been mastered by those skilled in the art, and will not be elaborated here.

[0034] See also Figure 2-Figure 5 The protection mechanism shown in the figure includes a protection ring 401 slidably connected in the filter cartridge 101, the protection ring 401 is concentrically arranged with the membrane element body 102, a plurality of protection tubes 402 are fixedly connected to one side of the protection ring 401 close to the membrane element body 102, each protection tube 402 is slidably connected with a protection rod 403, one end of each protection rod 403 located inside the protection tube 402 is fixedly connected with a protection plate 404, and the other end of each protection rod 403 is rotatably connected with a rotating ball 406, and a distance sensor 405 is provided on the bottom wall of each protection tube 402, and the distance sensor 405 is electrically connected to the vacuum pump 2 through the controller, and a driving mechanism for driving the protection ring 401 is provided on the filter cartridge 101;

[0035] It should be noted here that: through the provision of the protective mechanism, under the driving action of the driving mechanism, in the process of the vacuum pump 2 discharging the air inside the filter cartridge 101, by detecting the deformation of the surface of the membrane element body 102, deformation and damage of the membrane element body 102 caused by excessive discharge of air under negative pressure conditions can be avoided, thereby ensuring the protection effect of the membrane element body 102 while improving the safety of protecting the membrane element body 102.

[0036] See also Figure 5 , each protection rod 403 shown in the figure is located on the side wall of the protection tube 402 and is sleeved with a spring 407, and the two ends of the spring 407 are respectively connected to the inner wall of the protection tube 402 and the protection plate 404;

[0037] It should be noted that: by setting the spring 407 , the rotating ball 406 abuts against the side wall of the membrane element body 102 , so that the membrane element body 102 is deformed. Under the action of the spring 407 , the rotating ball 406 drives the protective plate 404 to move closer to the membrane element body 102 .

[0038] See also Figure 4 , the interior of the protective ring 401 shown in the figure is hollow, and a plurality of counterweight blocks are arranged in the hollow;

[0039] It should be noted here that: by providing a counterweight block, the protective ring 401 can slide in the filter cartridge 101 under the action of gravity.

[0040] It is worth noting that the counterweight block is arranged in the hollow of the protective ring 401 .

[0041] See also Figure 3 The driving mechanism shown in the figure includes a winding drum 501 disposed on the top of the filter cartridge 101, a pull rope 502 is wound inside the winding drum 501, one end of the pull rope 502 passes through the filter cartridge 101 and is connected to the protective ring 401;

[0042] It should be noted here that: through the setting of the driving mechanism, it is convenient to drive the protective ring 401 to slide in the filter cartridge 101.

[0043] See also Figure 3 , there are two driving mechanisms in the figure, the two driving mechanisms are symmetrically arranged, and the filter cartridge 101 is provided with a linkage component for linking the two driving mechanisms;

[0044] It should be noted here that: by using two driving mechanisms that are symmetrically arranged with each other, the stability of pulling the protective ring 401 can be improved.

[0045] Working principle: When the membrane element body 102 is protected during the shutdown of the nanofiltration membrane system, the air inside the filter cartridge 101 is first discharged through the vacuum pump 2. In the process of discharging the air in the filter cartridge 101, the two winding drums 501 are driven to rotate through the linkage assembly. When the two winding drums 501 release the pull rope 502, the protective ring 401 slides on the peripheral side of the membrane element body 102 under the gravity of the counterweight block and the rotation of the rotating ball 406. At the same time, when the winding drum 501 winds up the pull rope 502, it will drive the protective ring 401 to slide in the opposite direction on the membrane element body 102, so that the release and winding of the pull rope 502 by the winding drum 501 drive the protective ring 401 to slide reciprocatingly on the peripheral side of the membrane element body 102;

[0046] When the protective ring 401 slides back and forth on the peripheral side of the membrane element body 102, the distance sensor 405 detects the protective plate 404 to timely detect the deformation of the membrane element body 102 during the air extraction process. If the air pump 2 discharges too much air in the filter cartridge 101, the membrane element body 102 will be deformed under the action of negative pressure. At this time, the rotating ball 406 drives the protective plate 404 to move closer to the membrane element body 102 under the action of the spring 407. At this time, the distance sensor 405 will detect the movement of the protective plate 404, and will send an electrical signal to the controller to stop the operation of the air extraction pump 2, thereby ensuring the discharge of the air inside the filter cartridge 101 while avoiding deformation and damage of the membrane element body 102 under negative pressure due to excessive discharge of air, thereby ensuring the protection effect of the membrane element body 102 and improving the safety of the protection of the membrane element body 102.

[0047] After the air in the filter cartridge 101 is exhausted, the protection liquid can be injected to protect the membrane element body 102 during the shutdown of the nanofiltration membrane system.

[0048] Example 2

[0049] See also Figure 3 This embodiment further illustrates Example 1. The linkage assembly shown in the figure includes two fixed plates 601 fixedly connected to the top of the filter cartridge 101 and symmetrically arranged with each other. A linkage rod 602 is rotatably connected between the two fixed plates 601. Two winding reels 501 are fixedly connected to the side walls of the linkage rod 602.

[0050] It should be noted here that: through the setting of the linkage assembly, when the motor 603 drives the linkage rod 602 to rotate, the two winding drums 501 will be driven to rotate synchronously.

[0051] Furthermore, a motor 603 is provided on one of the two fixing plates 601, and an output end of the motor 603 is connected to the linkage rod 602;

[0052] It should be noted here that: the motor 603 is provided to facilitate driving the linkage rod 602 to rotate.

[0053] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A membrane element protection device during shutdown of a nanofiltration membrane system, comprising: A membrane element body (102) is arranged in a filter cartridge (101), wherein a liquid inlet pipe (103) and a liquid outlet pipe (104) are respectively arranged at the bottom of the filter cartridge (101), and control valves (105) are respectively arranged on the side walls of the liquid inlet pipe (103) and the liquid outlet pipe (104); Its characteristics include: An air pump (2) is arranged on the top of the filter cartridge (101), and the air suction end of the air pump (2) is connected to the inside of the filter cartridge (101) through a connecting pipe (3). A protective mechanism for protecting the membrane element body (102) during the exhaust process is provided inside the filter cartridge (101).

2. The membrane element protection device for a nanofiltration membrane system during shutdown according to claim 1, characterized in that: The protection mechanism comprises a protection ring (401) slidably connected in the filter cartridge (101), the protection ring (401) being concentrically arranged with the membrane element body (102), a plurality of protection tubes (402) being fixedly connected to one side of the protection ring (401) close to the membrane element body (102), each of the protection tubes (402) being slidably connected to a protection rod (403), one end of each of the protection rods (403) located inside the protection tube (402) being fixedly connected to a protection plate (404), and the other end of each of the protection rods (403) being rotatably connected to a rotating ball (406), a distance sensor (405) being arranged on the bottom wall of each of the protection tubes (402), and the distance sensor (405) being electrically connected to the vacuum pump (2) via a controller, and a driving mechanism for driving the protection ring (401) being arranged on the filter cartridge (101).

3. The membrane element protection device for a nanofiltration membrane system during shutdown according to claim 2, characterized in that: Each of the protection rods (403) is sleeved with a spring (407) on the side wall inside the protection tube (402), and the two ends of the spring (407) are respectively connected to the inner wall of the protection tube (402) and the protection plate (404).

4. The membrane element protection device for a nanofiltration membrane system during shutdown according to claim 2, characterized in that: The interior of the protective ring (401) is hollow, and a plurality of counterweight blocks are arranged in the hollow.

5. The membrane element protection device for a nanofiltration membrane system during shutdown according to claim 2, characterized in that: The driving mechanism comprises a winding drum (501) arranged on the top of the filter cartridge (101), a pull rope (502) being wound inside the winding drum (501), one end of the pull rope (502) passing through the filter cartridge (101) and connected to the protective ring (401).

6. The membrane element protection device during shutdown of a nanofiltration membrane system according to claim 5, characterized in that: Two driving mechanisms are provided, and the two driving mechanisms are arranged symmetrically with each other. The filter cartridge (101) is provided with a linkage component for linking the two driving mechanisms.

7. The membrane element protection device for a nanofiltration membrane system during shutdown according to claim 6, characterized in that: The linkage assembly comprises two fixed plates (601) fixedly connected to the top of the filter cartridge (101) and symmetrically arranged with each other, a linkage rod (602) is rotatably connected between the two fixed plates (601), and the two winding reels (501) are fixedly connected to the side walls of the linkage rod (602).

8. The membrane element protection device for a nanofiltration membrane system during shutdown according to claim 7, characterized in that: A motor (603) is provided on one of the two fixing plates (601), and an output end of the motor (603) is connected to a linkage rod (602).

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