Water tank filtering membrane backwashing device

Abstract

The utility model discloses a water tank filter membrane backwashing device, which relates to the technical field of water treatment and comprises a backwashing water storage tank and a liquid medicine storage tank, the backwashing water storage tank is provided with a water outlet and a water replenishing port, and the liquid medicine storage tank is provided with a medicine outlet; a water outlet in the backwashing water storage tank is connected with a water outlet pipe of the water tank through a backwashing pipeline, a backwashing water manual ball valve, a backwashing water output pump, a mixing pipe fitting, a backwashing water one-way valve and a backwashing water electric ball valve are sequentially arranged on the backwashing pipeline, and a water supplementing port in the backwashing water storage tank is connected with the water outlet pipe of the water tank through a water supplementing pipeline. A water replenishing manual ball valve and a water replenishing electric ball valve are sequentially arranged on the water replenishing pipe; a chemical outlet in the chemical liquid storage tank is connected with a mixing pipe fitting on the backwashing pipeline through a chemical feeding pipeline, the mixing pipe fitting is used for mixing backwashing water and chemical liquid, and the problems that an existing filter membrane backwashing device can only perform backwashing through water, does not have a chemical feeding function, cannot effectively clean a curtain type membrane and is low in cleaning efficiency are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a water tank filter membrane backwashing device, in particular to a water tank curtain type membrane backwashing device. Background Art

[0002] The commonly used filter membrane for purified water tanks is the curtain membrane, which is a membrane separation technology, also known as AC filtration. During the filtration process of the curtain membrane, the solution flows parallel to the membrane surface at a certain speed, rather than passing through the membrane vertically. This parallel flow can reduce the blockage and contamination of the membrane surface, thereby increasing the service life and efficiency of the membrane. The curtain membrane is usually composed of a number of porous hollow fiber membrane filaments and a pair of water collection pipes. The curtain membrane is generally used in conjunction with an aeration pipe.

[0003] After long-term use, curtain membranes usually need to be cleaned with chemicals. The cleaning cycle depends on the water quality. When the water quality is good, it needs to be cleaned every 3-4 months, and when the water quality is poor, it needs to be cleaned every 15-20 days. However, most of the current backwashing devices can only backwash with water and do not have the function of adding chemicals. There is a problem that the curtain membrane cannot be effectively cleaned and the cleaning efficiency is low.

[0004] In the utility model with application number: 202322726029.5 and publication number CN221156135U, a cleaning system for a filter membrane assembly is disclosed, including a cleaning chamber for placing and cleaning the filter membrane assembly, a backwashing device connected to the cleaning chamber, a sealing arrangement for the cleaning chamber, a drainage hole and a liquid inlet connected to the filter membrane assembly, but it still has the problem that it can only be backwashed by water, has no dosing function, cannot effectively clean the curtain membrane, and has a low cleaning efficiency. Utility Model Content

[0005] Based on this, in order to solve the above problems, the utility model proposes a water tank filter membrane backwashing device, which solves the problem that the current filter membrane backwashing device can only backwash by water, has no dosing function, cannot effectively clean the curtain membrane, and has low cleaning efficiency.

[0006] The technical solution of the utility model is:

[0007] A water tank filter membrane backwash device comprises a backwash water storage tank for storing backwash water and a liquid medicine storage tank for storing liquid medicine, the backwash water storage tank is provided with a water outlet and a water replenishment port, and the liquid medicine storage tank is provided with a liquid medicine outlet;

[0008] The water outlet on the backwash water storage tank is connected to the water outlet pipe of the water tank through the backwash pipe, and the backwash pipe is provided with a backwash water manual ball valve, a backwash water output pump, a mixing pipe, a backwash water check valve and a backwash water electric ball valve in sequence. The water replenishment port on the backwash water storage tank is connected to the water outlet pipe of the water tank through the water replenishment pipe, and the water replenishment manual ball valve and the water replenishment electric ball valve are provided in sequence on the water replenishment pipe;

[0009] The medicine outlet on the medicine storage tank is connected to the mixing pipe on the backwash pipe through the dosing pipe. The mixing pipe is used to mix backwash water and medicine. The dosing pipe is equipped with a dosing manual ball valve, a dosing output pump, a dosing check valve and a dosing electric ball valve in sequence.

[0010] Preferably, the mixing pipe comprises a first pipe body, a second pipe body, a third pipe body and a fourth pipe body which are connected in sequence by flanges, and the first pipe body, the second pipe body, the third pipe body and the fourth pipe body are respectively provided with a first flow channel, a second flow channel, a third flow channel and a fourth flow channel, and the first flow channel, the second flow channel, the third flow channel and the fourth flow channel are connected and arranged, wherein the diameter of the second flow channel is smaller than the diameters of the first flow channel, the third flow channel and the fourth flow channel.

[0011] Preferably, a connecting pipe is provided on the top of the second tube body, the connecting pipe is fixedly connected to the second tube body, the bottom of the connecting pipe is located in the second flow channel, the top of the connecting pipe passes through the second tube body and extends to the outside of the second tube body, an inclined surface is provided at the bottom of the connecting pipe, and a first flange is provided on the top of the connecting pipe, and the dosing pipeline can be flange-connected to the first flange.

[0012] Preferably, a plug-in tube is provided in the connecting pipe, the bottom of the plug-in tube can be inserted into the connecting pipe and extend into the second flow channel, an atomizing nozzle is provided at the bottom of the plug-in tube, the atomizing nozzle is matched with the inclined surface of the bottom of the connecting pipe, a second flange is provided in the middle of the plug-in tube, the second flange can be sealed and connected to the first flange, and the dosing pipe can be sealed and connected to the top of the plug-in tube.

[0013] Preferably, a third flange is provided on the top of the plug-in tube, and the dosing pipeline can be flange-connected to the third flange.

[0014] Preferably, a buffer is provided at one end of the third tube body connected to the fourth tube body, and the buffer is used to buffer the flow rate of the liquid in the third tube body.

[0015] Preferably, the buffer component includes a shell, a connecting rod and four mounting plates, the four mounting plates are arranged on the connecting rod, one end of the four mounting plates is fixedly connected to the connecting rod, and the other end is fixedly connected to the inner wall of the shell, a number of buffer plates are arranged on the four mounting plates, one end of the connecting rod is located in the shell, and the other end extends out of the shell, and the outer wall of the shell is connected to the inner wall of the third tube body.

[0016] Preferably, the plurality of buffer plates are arranged in a staggered manner, and a liquid flow channel for liquid to pass through is provided between the plurality of buffer plates.

[0017] Preferably, the outer side wall of the shell is fixedly connected to the inner side wall of the third tube body.

[0018] Preferably, the outer wall of the shell is threadedly connected to the inner wall of the third tube body, the outer wall of the shell is provided with an external thread, the inner wall of the third tube body is provided with an internal thread matched with the external thread, a knob is provided at one end of the connecting rod extending out of the shell, the knob is fixedly connected to the connecting rod, and the knob is located outside the shell, and when the third tube body is connected to the fourth tube body, the knob is located inside the fourth tube body.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] When the utility model is in use, a medicine liquid storage box is arranged, and a medicine outlet is arranged on the medicine liquid storage box, and then the medicine outlet is connected with a mixing pipe fitting on the backwash pipe through a medicine adding pipe, and then a medicine adding manual ball valve, a medicine adding output pump, a medicine adding non-return valve and a medicine adding electric ball valve are arranged in sequence on the medicine adding pipe, so that the medicine liquid in the medicine liquid storage box is pumped into the backwash pipe by the medicine adding output pump to be mixed with the backwash water, and then the mixed liquid enters the water tank through the water tank outlet pipe to chemically clean the curtain membrane, thereby effectively completing the cleaning process of the curtain membrane, and solving the problem that the current filter membrane backwashing device can only backwash with water, has no medicine adding function, cannot effectively clean the curtain membrane, and has low cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the framework structure of a water tank filter membrane backwashing device described in an embodiment of the utility model;

[0022] Figure 2 It is a schematic diagram of the structure of the mixing pipe member described in the embodiment of the utility model;

[0023] Figure 3 It is a schematic diagram of the cross-sectional structure of the mixing pipe member described in the embodiment of the utility model;

[0024] Figure 4 It is a structural schematic diagram of the buffer member described in the embodiment of the utility model;

[0025] Figure 5 It is a partial structural schematic diagram of the buffer member described in the embodiment of the utility model;

[0026] Figure 6 It is a structural schematic diagram of the second tube body described in the embodiment of the utility model;

[0027] Figure 7 is a schematic cross-sectional structure diagram of the second tube body described in the embodiment of the utility model;

[0028] Description of reference numerals:

[0029] 10-backwash water storage tank, 100-water outlet, 101-water replenishment port, 102-backwash pipe, 103-backwash water manual ball valve, 104-backwash water output pump, 105-backwash water check valve, 106-backwash water electric ball valve, 107-water replenishment pipe, 108-water replenishment manual ball valve, 109-water replenishment electric ball valve, 20-liquid storage tank, 200-drug outlet, 201-dosing pipe, 202-dosing manual ball valve, 203-dosing output pump, 204-dosing check valve, 205-dosing electric ball valve, 30-mixing pipe fittings, 3 00-first tube body, 301-second tube body, 302-third tube body, 303-fourth tube body, 304-first flow channel, 305-second flow channel, 306-third flow channel, 307-fourth flow channel, 308-connecting pipe, 309-inclined surface, 310-first flange, 311-plug-in tube, 312-atomizing nozzle, 313-second flange, 314-third flange, 315-buffer, 316-shell, 317-connecting rod, 318-mounting plate, 319-buffer plate, 320-liquid flow channel, 321-knob. DETAILED DESCRIPTION

[0030] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0031] Example:

[0032] like Figure 1 As shown, in order to solve the above problems, this embodiment discloses a water tank filter membrane backwash device, including a backwash water storage tank 10 for storing backwash water and a liquid medicine storage tank 20 for storing liquid medicine, the backwash water storage tank 10 is provided with a water outlet 100 and a water replenishment port 101, and the liquid medicine storage tank 20 is provided with a liquid medicine outlet 200;

[0033] The water outlet 100 on the backwash water storage tank 10 is connected to the water outlet pipe of the water tank through the backwash pipe 102, and the backwash pipe 102 is provided with a backwash water manual ball valve 103, a backwash water output pump 104, a mixing pipe 30, a backwash water check valve 105 and a backwash water electric ball valve 106 in sequence. The water replenishment port 101 on the backwash water storage tank 10 is connected to the water outlet pipe of the water tank through the water replenishment pipe 107, and the water replenishment manual ball valve 108 and the water replenishment electric ball valve 109 are provided in sequence on the water replenishment pipe 107;

[0034] The medicine outlet 200 on the medicine storage tank 20 is connected to the mixing pipe 30 on the backwash pipe 102 through the dosing pipe 201. The mixing pipe 30 is used to mix backwash water and medicine. The dosing pipe 201 is provided with a dosing manual ball valve 202, a dosing output pump 203, a dosing one-way valve 204 and a dosing electric ball valve 205 in sequence.

[0035] When the utility model is in use, a medicine storage box 20 is set, and a medicine outlet 200 is provided on the medicine storage box 20, and then the medicine outlet 200 is connected to the mixing pipe 30 on the backwash pipe 102 through the dosing pipe 201, and then a dosing manual ball valve 202, a dosing output pump 203, a dosing check valve 204 and a dosing electric ball valve 205 are sequentially arranged on the dosing pipe 201, so that the medicine in the medicine storage box 20 is pumped into the backwash pipe 102 through the dosing output pump 203 to mix with the backwash water, and then the mixed liquid enters the water tank through the water tank outlet pipe to chemically clean the curtain membrane, thereby effectively completing the cleaning process of the curtain membrane, and solving the problem that the current filter membrane backwashing device can only be backwashed by water, has no dosing function, cannot effectively clean the curtain membrane, and has low cleaning efficiency.

[0036] Among them, the backwash water manual ball valve 103, the backwash water output pump 104, the backwash water check valve 105 and the backwash water electric ball valve 106 respectively adopt the manual ball valve, output pump, check valve and electric ball valve in the prior art that can realize the functions of the utility model. The backwash water manual ball valve 103 is a normally open valve and is only manually closed during maintenance or other emergency situations. The backwash water output pump 104 is used to pump the liquid medicine out of the liquid medicine storage tank 20. The backwash water check valve 105 is used to prevent the mixed liquid of the backwash water and the liquid medicine from flowing back. The backwash water electric ball valve 106 is used to control the output of the mixed liquid of the backwash water and the liquid medicine.

[0037] The water supply manual ball valve 108 and the water supply electric ball valve 109 are respectively a manual ball valve and an electric ball valve in the prior art that can realize the functions of the utility model. The water supply manual ball valve 108 is a normally open valve and is only manually closed during maintenance or other emergencies. The water supply electric ball valve 109 is used to control the clean water in the water tank outlet pipe to be input into the backwash water storage tank 10.

[0038] The dosing manual ball valve 202, the dosing output pump 203, the dosing check valve 204 and the dosing electric ball valve 205 respectively adopt the manual ball valve, output pump, check valve and electric ball valve in the prior art. The dosing manual ball valve 202 is a normally open valve and is only manually closed during maintenance or other emergency situations. The dosing output pump 203 is used to pump out the liquid medicine in the liquid medicine storage tank 20. The dosing check valve 204 is used to prevent the liquid medicine from flowing back. The dosing electric ball valve 205 is used to control the output of the liquid medicine.

[0039] The water tank outlet pipe is the water outlet pipe on the purified water tank in the water treatment system. The water outlet pipe is connected to the curtain membrane in the purified water tank to facilitate the clean water in the curtain membrane to enter the water outlet pipe.

[0040] The utility model needs to be connected to a control system in a water treatment device, and control can be achieved through the control system in the water treatment device.

[0041] In order to reduce the number of times of adding medicine, the medicine storage box 20 stores medicine with a higher concentration, for example, a high-concentration sodium hypochlorite solution.

[0042] At the same time, high-concentration chemical solution cannot be used directly to clean the curtain membrane. Therefore, the high-concentration chemical solution needs to be fully mixed with the backwash water to reduce its concentration, thereby facilitating the cleaning of the curtain membrane.

[0043] like Figures 2 to 3 As shown, in order to solve this problem, this embodiment is modified on the basis of the above embodiment, and the difference from the above embodiment is that the mixing pipe 30 includes a first pipe body 300, a second pipe body 301, a third pipe body 302 and a fourth pipe body 303 which are connected in sequence by flanges, and a first flow channel 304, a second flow channel 305, a third flow channel 306 and a fourth flow channel 307 are respectively provided in the first pipe body 300, the second pipe body 301, the third pipe body 302 and the fourth pipe body 303, and the first flow channel 304, the second flow channel 305, the third flow channel 306 and the fourth flow channel 307 are connected, wherein the diameter of the second flow channel 305 is smaller than the diameters of the first flow channel 304, the third flow channel 306 and the fourth flow channel 307.

[0044] Preferably, one end of the first tube body 300 is connected to the backwash pipe 102 .

[0045] Preferably, one end of the dosing pipe 201 passes through the second tube body 301 and is communicated with the second flow channel 305 , and the dosing pipe 201 is sealedly connected to the second tube body 301 .

[0046] When in use, since the diameter of the second flow channel 305 is smaller than the diameters of the first flow channel 304, the third flow channel 306 and the fourth flow channel 307, a Venturi tube structure is formed between the first flow channel 304, the second flow channel 305 and the third flow channel 306, so that the backwash water and the chemical solution can be accelerated when passing through the second flow channel 305, thereby achieving the effect of mixing the backwash water and the chemical solution.

[0047] like Figure 6 to Figure 7 As shown, in another embodiment, in order to facilitate the connection between the dosing pipe 201 and the second tube body 301 and accelerate the mixing of the liquid medicine and the backwash water, this embodiment is modified on the basis of the above embodiment. The difference from the above embodiment is that a connecting pipe 308 is provided on the top of the second tube body 301, and the connecting pipe 308 is fixedly connected to the second tube body 301. The bottom of the connecting pipe 308 is located in the second flow channel 305, and the top of the connecting pipe 308 passes through the second tube body 301 and extends to the outside of the second tube body 301. An inclined surface 309 is provided at the bottom of the connecting pipe 308, and a first flange 310 is provided on the top of the connecting pipe 308. The dosing pipe 201 can be flange-connected with the first flange 310.

[0048] When in use, the dosing pipe 201 can be flange-connected to the first flange 310, so as to connect the dosing pipe 201 to the connecting pipe 308, and thus connect the dosing pipe 201 to the second pipe body 301. At the same time, an inclined surface 309 is provided at the bottom of the connecting pipe 308, so that a vortex is formed when the backwash water flushes the connecting pipe 308, and at the same time, the liquid medicine flows out from the inclined surface 309 and can be mixed with the backwash water forming the vortex more quickly.

[0049] In another embodiment, in order to mix the backwash water with the chemical solution more quickly, this embodiment is modified on the basis of the above embodiment. The difference from the above embodiment is that a plug-in tube 311 is provided in the connecting tube 308, and the bottom of the plug-in tube 311 can be inserted into the connecting tube 308 and extend into the second flow channel 305. An atomizing nozzle 312 is provided at the bottom of the plug-in tube 311, and the atomizing nozzle 312 is matched with the inclined surface 309 at the bottom of the connecting tube 308. A second flange 313 is provided in the middle of the plug-in tube 311, and the second flange 313 can be sealed and connected to the first flange 310, and the dosing pipe 201 can be sealed and connected to the top of the plug-in tube 311.

[0050] The arrangement of the atomizing nozzle 312 can atomize the liquid medicine, thereby allowing the atomized liquid medicine to mix more quickly with the backwash water forming the vortex.

[0051] Preferably, a third flange 314 is provided on the top of the plug-in tube 311 , and the dosing pipeline 201 can be flange-connected to the third flange 314 .

[0052] The third flange 314 can facilitate the connection between the dosing pipe 201 and the plug pipe 311 .

[0053] Preferably, a buffer 315 is provided at one end of the third tube body 302 connected to the fourth tube body 303 . The buffer 315 is disposed in the third flow channel 306 . The buffer 315 is used to buffer the flow rate of the liquid in the third tube body 302 .

[0054] like Figures 4 to 5 As shown, in order to reduce the flow rate of the mixed liquid and further mix it, this embodiment is modified on the basis of the above embodiment. The difference from the above embodiment is that the buffer 315 includes a shell 316, a connecting rod 317 and four mounting plates 318. The four mounting plates 318 are arranged on the connecting rod 317. One end of the four mounting plates 318 is fixedly connected to the connecting rod 317, and the other end is fixedly connected to the inner wall of the shell 316. A number of buffer plates 319 are arranged on the four mounting plates 318. One end of the connecting rod 317 is located in the shell 316, and the other end extends out of the shell 316. The outer wall of the shell 316 is connected to the inner wall of the third tube body 302.

[0055] Preferably, the plurality of buffer plates 319 are arranged in a staggered manner, and a liquid flow channel 320 for liquid to pass through is provided between the plurality of buffer plates 319 .

[0056] When in use, the mixed liquid is blocked by the buffer plates 319 when passing through the buffer member 315, and the mixed solution can only flow through the liquid flow channel 320, thereby achieving the effect of buffering and further mixing the liquid medicine and the backwash water.

[0057] Preferably, the outer wall of the shell 316 is fixedly connected to the inner wall of the third tube 302 .

[0058] In another embodiment, in order to facilitate the cleaning of the buffer part 315, it is further preferred that the outer wall of the shell 316 is threadedly connected to the inner wall of the third tube body 302, the outer wall of the shell 316 is provided with an external thread, and the inner wall of the third tube body 302 is provided with an internal thread matched with the external thread, and the end of the connecting rod 317 extending out of the shell 316 is provided with a knob 321, the knob 321 is fixedly connected to the connecting rod 317, and the knob 321 is located on the outside of the shell 316, and when the third tube body 302 is connected to the fourth tube body 303, the knob 321 is located inside the fourth tube body 303.

[0059] The outer wall of the shell 316 is threadedly connected to the inner wall of the third tube 302, so that the buffer 315 can be quickly removed for cleaning.

[0060] Working principle of this utility model:

[0061] When the utility model is in use, a medicine storage tank 20 is provided, and a medicine outlet 200 is provided on the medicine storage tank 20, and then the medicine outlet 200 is connected to the mixing pipe 30 on the backwash pipe 102 through the dosing pipe 201, and then a dosing manual ball valve 202, a dosing output pump 203, a dosing check valve 204 and a dosing electric ball valve 205 are sequentially provided on the dosing pipe 201, so that the medicine in the medicine storage tank 20 is pumped into the backwash pipe 102 through the dosing output pump 203 to mix with the backwash water, and then the mixed liquid enters the water tank through the water tank outlet pipe to chemically clean the curtain membrane, thereby effectively completing the cleaning process of the curtain membrane.

[0062] The above-mentioned embodiments only express the specific implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A water tank filter membrane backwashing device, characterized in that: It comprises a backwash water storage tank (10) for storing backwash water and a liquid medicine storage tank (20) for storing liquid medicine, the backwash water storage tank (10) being provided with a water outlet (100) and a water replenishment port (101), and the liquid medicine storage tank (20) being provided with a liquid medicine outlet (200); The water outlet (100) on the backwash water storage tank (10) is connected to the water outlet pipe of the water tank through the backwash pipe (102), and the backwash pipe (102) is provided with a backwash water manual ball valve (103), a backwash water output pump (104), a mixing pipe (30), a backwash water check valve (105) and a backwash water electric ball valve (106) in sequence. The water replenishment port (101) on the backwash water storage tank (10) is connected to the water outlet pipe of the water tank through the water replenishment pipe (107), and the water replenishment pipe (107) is provided with a water replenishment manual ball valve (108) and a water replenishment electric ball valve (109) in sequence. The drug outlet (200) on the drug liquid storage box (20) is connected to the mixing pipe (30) on the backwash pipe (102) through the drug adding pipe (201). The mixing pipe (30) is used to mix backwash water and drug liquid. The drug adding pipe (201) is provided with a drug adding manual ball valve (202), a drug adding output pump (203), a drug adding non-return valve (204) and a drug adding electric ball valve (205) in sequence.

2. A water tank filter membrane backwashing device according to claim 1, characterized in that: The mixing pipe (30) comprises a first pipe body (300), a second pipe body (301), a third pipe body (302) and a fourth pipe body (303) which are connected in sequence by flanges; a first flow channel (304), a second flow channel (305), a third flow channel (306) and a fourth flow channel (307) are respectively arranged in the first pipe body (300), the second pipe body (301), the third pipe body (302) and the fourth pipe body (303); the first flow channel (304), the second flow channel (305), the third flow channel (306) and the fourth flow channel (307) are connected and arranged; wherein the diameter of the second flow channel (305) is smaller than the diameters of the first flow channel (304), the third flow channel (306) and the fourth flow channel (307).

3. A water tank filter membrane backwashing device according to claim 2, characterized in that: A connecting pipe (308) is provided at the top of the second tube body (301), the connecting pipe (308) is fixedly connected to the second tube body (301), the bottom of the connecting pipe (308) is located in the second flow channel (305), the top of the connecting pipe (308) passes through the second tube body (301) and extends to the outside of the second tube body (301), an inclined surface (309) is provided at the bottom of the connecting pipe (308), and a first flange (310) is provided at the top of the connecting pipe (308), and the dosing pipeline (201) can be flange-connected to the first flange (310).

4. A water tank filter membrane backwashing device according to claim 3, characterized in that: A plug-in tube (311) is provided in the connecting tube (308). The bottom of the plug-in tube (311) can be inserted into the connecting tube (308) and extend into the second flow channel (305). An atomizing nozzle (312) is provided at the bottom of the plug-in tube (311). The atomizing nozzle (312) is arranged in cooperation with the inclined surface (309) at the bottom of the connecting tube (308). A second flange (313) is provided in the middle of the plug-in tube (311). The second flange (313) can be sealedly connected to the first flange (310). The dosing pipeline (201) can be sealedly connected to the top of the plug-in tube (311).

5. A water tank filter membrane backwashing device according to claim 4, characterized in that: A third flange (314) is provided on the top of the plug-in tube (311), and the drug adding pipeline (201) can be flange-connected to the third flange (314).

6. A water tank filter membrane backwashing device according to claim 2, characterized in that: A buffer (315) is provided at one end of the third tube body (302) connected to the fourth tube body (303), and the buffer (315) is used to buffer the flow rate of the liquid in the third tube body (302).

7. A water tank filter membrane backwashing device according to claim 6, characterized in that: The buffer component (315) includes a shell (316), a connecting rod (317) and four mounting plates (318). The four mounting plates (318) are arranged on the connecting rod (317). One end of the four mounting plates (318) is fixedly connected to the connecting rod (317), and the other end is fixedly connected to the inner wall of the shell (316). A plurality of buffer plates (319) are arranged on the four mounting plates (318). One end of the connecting rod (317) is located in the shell (316), and the other end extends out of the shell (316). The outer wall of the shell (316) is connected to the inner wall of the third tube (302).

8. A water tank filter membrane backwashing device according to claim 7, characterized in that: The plurality of buffer plates (319) are arranged in a staggered manner, and a liquid flow channel (320) for liquid to pass through is provided between the plurality of buffer plates (319).

9. A water tank filter membrane backwashing device according to claim 8, characterized in that: The outer wall of the shell (316) is fixedly connected to the inner wall of the third tube (302).

10. A water tank filter membrane backwashing device according to claim 8, characterized in that: The outer wall of the shell (316) is threadedly connected to the inner wall of the third tube (302); the outer wall of the shell (316) is provided with an external thread; the inner wall of the third tube (302) is provided with an internal thread matched with the external thread; a knob (321) is provided at one end of the connecting rod (317) extending out of the shell (316); the knob (321) is fixedly connected to the connecting rod (317), and the knob (321) is located outside the shell (316); when the third tube (302) is connected to the fourth tube (303), the knob (321) is located inside the fourth tube (303).

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