Wastewater treatment equipment and treatment method

Abstract

The present invention relates to the technical field of wastewater treatment, and in particular to a wastewater treatment device and a treatment method, comprising a filter element, an expansion tube, a linear motor and a limit ring, wherein the expansion tube is an elastic rubber tube, and mounting flanges are arranged on both ends of the expansion tube; the closed end of the filter element is coaxially arranged on the inner side of the expansion tube, and a water flow channel is formed between the expansion tube and the filter element; the linear motor is parallel to the expansion tube and fixed between the two mounting flanges, and the output end of the linear motor is fixedly connected to the limit ring; the limit ring is sleeved on the end of the expansion tube away from the clean water outlet, and the limit ring is slidably connected to the expansion tube; the present invention drives the limit ring to reciprocate linearly on the expansion tube through a linear motor to reduce the local hydraulic radius of the water flow channel, increase the flow rate, and then flush the surface of the filter element to achieve automatic cleaning, and no disassembly or shutdown is required during the process, which is relatively simple and convenient and conducive to continuous production.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to a wastewater treatment device and a treatment method. Background Art

[0002] COD wastewater is generally treated by incineration process, such as a high COD wastewater treatment method disclosed in CN114963202B, which is to allow the wastewater to enter the disc-shaped evaporation tube in the chimney assembly through the wastewater inlet, and evaporate it using the residual heat of the flue gas after incineration. The evaporated gas enters the incinerator through the steam introduction pipeline for incineration. A steam temporary storage tank is provided on the steam introduction pipeline for storing steam to adjust the air pressure in the incinerator.

[0003] For COD wastewater containing a large amount of solid impurities, these impurities are prone to form scaling on the inner wall of the evaporation tube during the incineration process, affecting the heat exchange efficiency. In order to reduce this effect, it is usually necessary to use a pre-filter before incineration to reduce the impurity content in the wastewater, such as using the ceramic filter element filter disclosed in CN219558890U.

[0004] After using the ceramic filter element filter for a period of time, the ceramic filter element inside needs to be cleaned. Due to the structure of the filter, when cleaning, it is generally necessary to disassemble the filter first, and then clean the ceramic filter element inside. The cleaning process is relatively cumbersome and inconvenient. Moreover, during the cleaning process, it is usually necessary to cut off the sewage delivery first, and then disassemble the filter, which will affect the continuity of production. Summary of the invention

[0005] In view of this, the present invention proposes a wastewater treatment equipment and a treatment method, which can realize automatic cleaning of the filter element by driving the limit ring on the expansion tube to move back and forth through a linear motor, and there is no need to disassemble the equipment or interrupt the production process during the process. This not only simplifies the cleaning process and improves the cleaning efficiency, but also helps to maintain the continuity of production, and solves the problem that the cleaning process of the existing pre-filter is relatively cumbersome and inconvenient, and the sewage transportation needs to be cut off during cleaning, which affects the continuity of production.

[0006] The technical solution of the present invention is achieved in this way:

[0007] In one aspect, the present invention provides a wastewater treatment device, comprising a filter element, an expansion tube, a linear motor and a limit ring, wherein:

[0008] The expansion tube is an elastic rubber tube, and mounting flanges are arranged on both ends of the expansion tube;

[0009] One end of the filter element is closed, and the other end is provided with a clean water outlet. The closed end of the filter element is coaxially arranged on the inner side of the expansion tube, and a water flow channel is formed between the expansion tube and the filter element.

[0010] The linear motor is parallel to the expansion tube and fixed between the two mounting flanges, and the output end of the linear motor is fixedly connected to the limiting ring;

[0011] The limiting ring is sleeved on one end of the expansion tube away from the clean water outlet, and the limiting ring is slidably connected to the expansion tube.

[0012] On the basis of the above technical solution, preferably, one end of the expansion tube is provided with a raw water inlet, and the other end is provided with a concentrated water outlet, wherein:

[0013] The filter element passes through the raw water inlet.

[0014] On the basis of the above technical solution, preferably, the filter element comprises a filtering part and a clean water conveying part, wherein:

[0015] The filter part is a cylindrical structure, the length of the filter part is smaller than the length of the expansion tube, and the filter part is centrally arranged in the expansion tube;

[0016] The clean water delivery part is a tubular structure, one end of the clean water delivery part is embedded and fixed in the barrel opening of the filter part, and the other end is the clean water outlet.

[0017] On the basis of the above technical solution, preferably, one end of the filter portion close to the clean water delivery portion is in a cone shape.

[0018] On the basis of the above technical solution, preferably, a raw water delivery channel is formed between the expansion tube and the clean water delivery part, and a concentrated water delivery channel is formed inside one end of the expansion tube provided with the limiting ring, wherein:

[0019] The concentrated water conveying channel is communicated with the raw water conveying channel through the water flow channel.

[0020] On the basis of the above technical solution, preferably, the limiting ring is a cylindrical structure, and a spiral shaping protrusion is provided on the inner surface of the limiting ring, wherein:

[0021] The shaping protrusion abuts against the outer wall of the expansion tube, and forms a spiral indentation on the inner wall of the expansion tube that protrudes toward the inside of the expansion tube.

[0022] On the basis of the above technical solution, preferably, a connecting portion is provided on the outer wall of the limiting ring, wherein:

[0023] The connecting portion is fixedly connected to the output end of the linear motor.

[0024] On the basis of the above technical solution, preferably, it also includes a limit cylinder, an oil injection ring and an outer cylinder, wherein:

[0025] The limiting cylinder is sleeved on the outside of the expansion tube and fixed between the two mounting flanges, and the limiting ring is loosely fitted inside the limiting cylinder;

[0026] An escape opening is provided on the side of the limiting cylinder and at a position corresponding to the linear motor, and the connecting portion passes through the escape opening and is slidably connected;

[0027] The oil injection ring is sleeved on the outside of the expansion tube and fixed on one end of the limit ring, and an oil injection nozzle is arranged on the side of the oil injection ring;

[0028] A first oil filling hole is provided through the side of the limiting cylinder and at a position corresponding to the oil filling nozzle;

[0029] One end of the outer cylinder is sleeved on one of the mounting flanges and fixedly connected, and the other end is sleeved on the other mounting flange and fixedly connected. A second oil filling hole is provided through the side of the outer cylinder at a position corresponding to the first oil filling hole.

[0030] On the basis of the above technical solution, preferably, it further includes a raw water inlet pipe and a concentrated water outlet pipe, wherein:

[0031] The raw water inlet pipe is coaxially arranged with the expansion pipe, and the clean water delivery part penetrates the raw water inlet pipe. An end plate is arranged on the side of the clean water delivery part, and the end plate is fixedly connected to one end of the raw water inlet pipe. The other end of the raw water inlet pipe is fixedly connected to one of the mounting flanges. A raw water inlet is arranged on the side of the raw water inlet pipe.

[0032] The concentrate water outlet pipe is coaxial with the expansion tube, and the concentrate water outlet pipe is fixedly connected to another mounting flange.

[0033] On the other hand, the present invention also provides a wastewater treatment method, using the above-mentioned wastewater treatment equipment, comprising the following steps:

[0034] S1. Pressurizing the sewage to be treated, and inputting the pressurized sewage from one end of the expansion tube. During the process, the sewage drives the expansion tube to expand, and the reaction force after the expansion increases the osmotic pressure inside the expansion tube, thereby improving the filtering efficiency and filtering effect of the filter element. The filtered sewage is concentrated into sewage concentrated water, which is discharged from the other end of the expansion tube, and the inside of the filter element obtains sewage clean water, which is discharged from the clean water outlet;

[0035] S2. During the filtering process, the linear motor drives the limit ring to move linearly from one end of the expansion tube where water flows out to the other end, and then moves in the opposite direction and returns. During the reciprocating movement of the limit ring, the expansion tube is partially contracted and returned to its original position, so as to reduce the local hydraulic radius of the water flow channel and increase the water flow velocity passing through the limit ring. At the same time, a spiral indentation is formed on the inner wall of the expansion tube through the shaping protrusion on the inner wall of the limit ring, so as to promote the water flowing through the limit ring to form a vortex, increase the water flow velocity passing through the limit ring, and improve the flushing effect of the water flow on the surface of the filter element after two accelerations.

[0036] The wastewater treatment equipment and treatment method of the present invention have the following beneficial effects compared with the prior art:

[0037] (1) By setting the expansion tube as an elastic rubber tube, it is convenient to drive the expansion tube to expand through sewage, so as to increase the hydraulic radius of the water flow channel and make the sewage flow smoothly through the expansion tube. At the same time, it is also convenient for the linear motor to drive the limit ring to reciprocate linearly on the expansion tube, so as to reduce the local hydraulic radius of the water flow channel, thereby increasing the flow rate of the water flowing through the limit ring, thereby forming a high-speed water flow, and the high-speed water flow is used to flush the surface of the filter element to remove attached debris, thereby realizing automatic cleaning. The process does not require disassembly or shutdown, which is relatively simple and convenient, and is conducive to continuous production.

[0038] (2) By arranging a shaping protrusion on the inner wall of the limit ring, it is convenient to form a spiral indentation on the inner wall of the expansion tube through the shaping protrusion, and the spiral indentation promotes the water flow through the limit ring to form a swirl, thereby increasing the flow rate of the water flow through the limit ring, so that the water flow has a better flushing effect on the surface of the filter element and a better cleaning effect.

[0039] (3) By setting the expansion tube as an elastic rubber tube, it is convenient for sewage to drive the expansion tube to expand. The reaction force after expansion increases the osmotic pressure inside the expansion tube, increases the speed of sewage passing through the filter element, and thus improves the filtration efficiency and filtration effect of the filter element.

[0040] (4) By setting a limit cylinder, it is convenient to constrain the maximum expansion radius of the expansion tube, so that the expansion tube is not easy to break and the service life is increased. At the same time, by setting an oil spray ring, it is convenient to spray lubricating oil on the surface of the expansion tube, so that the limit ring is not easy to cause wear to the expansion tube, thereby making the expansion tube more durable.

[0041] (5) By setting up a raw water conveying channel and setting up a conical shape at one end of the filter part close to the clean water conveying part, it is easier for sewage to enter the water flow channel, and then it is easier for the expansion tube to be filled with water and expanded. In addition, by setting up a concentrated water conveying channel, the confluence of concentrated water is facilitated, so that sewage can flow smoothly through the expansion tube. At the same time, the limit ring is parked at the position of the concentrated water conveying channel, which will not interfere with the flow of sewage, thereby keeping the concentrated water conveying channel unobstructed, so that sewage can flow smoothly through the expansion tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 A three-dimensional diagram of a wastewater treatment device of the present invention;

[0044] Figure 2 A top view of a wastewater treatment device of the present invention;

[0045] Figure 3 It is a sectional view taken along the line AA of a wastewater treatment device of the present invention;

[0046] Figure 4 It is a partial stereogram of the limiting cylinder of the present invention;

[0047] Figure 5 It is a partial exploded view of the limiting cylinder of the present invention;

[0048] Figure 6 It is a partial stereogram of the limiting ring of the present invention;

[0049] Figure 7 It is a partial stereoscopic view of the expansion tube of the present invention;

[0050] Figure 8 It is a partial longitudinal cross-sectional view of the limiting ring of the present invention;

[0051] In the figure: 1. filter element; 2. expansion tube; 3. linear motor; 4. limit ring; 5. limit cylinder; 6. oil injection ring; 7. outer cylinder; 8. raw water inlet pipe; 9. concentrated water outlet pipe; 61. oil injection nozzle; 101. clean water outlet; 102. water flow channel; 103. filter unit; 104. clean water delivery unit; 105. end plate; 201. mounting flange; 202. raw water inlet; 203. concentrated water outlet; 204. raw water delivery channel; 205. concentrated water delivery channel; 401. shaping protrusion; 402. connecting part; 501. avoidance port; 502. first oil injection hole; 701. second oil injection hole; 801. raw water inlet. DETAILED DESCRIPTION

[0052] The following will be combined with the specific implementation of the present invention to clearly and completely describe the technical solution in the present invention. Obviously, the described implementation is only a part of the implementation of the present invention, not all of the implementation. Based on the implementation of the present invention, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] like Figure 1-8 As shown, a wastewater treatment device of the present invention includes a filter element 1, an expansion tube 2, a linear motor 3 and a limit ring 4.

[0054] Among them, the expansion tube 2 is used to transport sewage, and its tube body is an elastic rubber tube. The material of the elastic rubber tube includes one of EPDM rubber, nitrile rubber, polyvinylidene fluoride, or fluororubber, or two materials, or a composite of two or more materials. These materials have good chemical stability, corrosion resistance, and temperature resistance, which can improve the durability of the expansion tube 2; when the tube body is filled with water, it can expand, and the inner diameter of the expansion tube 2 after expansion increases, which is conducive to the smooth transportation of sewage. When the expansion tube 2 loses water, its inner diameter is restored, such as Figure 3 As shown, mounting flanges 201 are provided at both ends of the expansion tube 2, and the mounting flanges 201 are metal flanges, wherein the metal flanges and the expansion tube 2 are bonded to form an integrated structure. At the same time, a raw water inlet 202 is provided at one end of the expansion tube 2, and a concentrated water outlet 203 is provided at the other end. Sewage is input from the raw water inlet 202 and output from the concentrated water outlet 203.

[0055] The function of the filter element 1 is to filter the sewage entering the expansion tube 2. Figure 3 As shown, one end of the filter element 1 is closed in a hemispherical shape, and the other end is provided with a clean water outlet 101, which is used to guide the clean water obtained after filtering inside the filter element 1; Figure 3As shown, one closed end of the filter element 1 is coaxially arranged on the inner side of the expansion tube 2, and the other end passes through the raw water inlet 202. At the same time, a water flow channel 102 for sewage circulation is formed between the expansion tube 2 and the filter element 1; when the expansion tube 2 transports sewage, the sewage drives the expansion tube 2 to expand under the influence of water pressure to increase the hydraulic radius of the water flow channel 102, so that the sewage can flow smoothly through the expansion tube 2, and the osmotic pressure in the water flow channel 102 can also be increased, so that the sewage can quickly pass through the filter element 1 for filtration, thereby improving the filtration efficiency and filtration effect.

[0056] The linear motor 3 is used to drive the limit ring 4 to move back and forth, so that the limit ring 4 forces the local hydraulic radius of the water flow channel 102 to decrease, thereby increasing the local water flow velocity. The sewage with increased flow velocity can flush the surface of the filter element 1.

[0057] like Figure 3 As shown, the linear motor 3 is parallel to the expansion tube 2, and the linear motor 3 is fixed between the two mounting flanges 201. In addition, the output end of the linear motor 3 is fixedly connected to the limit ring 4; Figure 4 There are two linear motors 3 shown in the figure, and the two linear motors 3 are symmetrical along the circumferential center of the expansion tube 2.

[0058] like Figure 3 As shown, the limit ring 4 is sleeved on the expansion tube 2 and slidably connected. In the initial state, the limit ring 4 is parked on the end of the expansion tube 2 away from the clean water outlet 101 (i.e., the end of the expansion tube 2 where water flows out), and the inner diameter of the limit ring 4 is equal to the initial outer diameter of the expansion tube 2, so that the inside of the expansion tube 2 remains unobstructed, wherein the initial outer diameter of the expansion tube 2 refers to the outer diameter of the expansion tube 2 in a relaxed state before sewage is input. At this time, the water flow channel 102 between the expansion tube 2 and the filter element 1 is also in the initial hydraulic radius; when the surface of the filter element 1 needs to be cleaned, the linear motor 3 drives the limit ring 4 to move linearly from one end of the expansion tube 2 where water flows out to the other end, and then moves in the opposite direction and returns to its original position. During the reciprocating process of the limit ring 4, the expansion tube 2 is partially contracted and returned to its original position, thereby reducing the local hydraulic radius of the water flow channel 102. After the hydraulic radius is reduced, the flow rate of the water flowing through the limit ring 4 is increased, so that the flushing effect of the water flow on the surface of the filter element 1 is improved.

[0059] In the above structure, the filter element 1 includes a filtering portion 103 and a clean water conveying portion 104 .

[0060] Among them, Figure 3 As shown, the filter part 103 is a cylindrical structure, made of ceramic, and its length is shorter than the length of the expansion tube 2. When installed, the filter part 103 is centrally arranged in the expansion tube 2, so that a raw water conveying channel 204 is formed between the expansion tube 2 and the clean water conveying part 104, and a concentrated water conveying channel 205 is formed inside the end of the expansion tube 2 provided with the limit ring 4 (i.e., the inside of the end of the expansion tube 2 away from the clean water outlet 101); Figure 3 The concentrated water delivery channel 205 shown in the figure is connected with the raw water delivery channel 204 through the water flow channel 102. When transporting sewage, the sewage enters the raw water delivery channel 204 from the raw water input port 202, and then enters the water flow channel 102. The sewage in the water flow channel 102 is filtered and treated by the filter unit 103. The treated sewage is concentrated, and the concentrated sewage enters the concentrated water delivery channel 205, and then discharges from the concentrated water output port 203.

[0061] like Figure 3 As shown, the clean water conveying part 104 is a tubular structure, and one end of the clean water conveying part 104 is embedded and fixed in the barrel mouth of the filter part 103, and the other end is the clean water outlet 101; during filtering, the interior of the filter part 103 obtains sewage clean water, and the sewage clean water is transported to the clean water outlet 101 by the clean water conveying part 104 and then discharged.

[0062] In order to facilitate the smooth entry of sewage into the water flow channel 102, Figure 3 As shown, one end of the filter portion 103 close to the clean water delivery portion 104 is in a cone shape.

[0063] In the wastewater treatment equipment, Figure 3 As shown, a plate-shaped connecting portion 402 is provided on the outer wall of the limiting ring 4, wherein the connecting portion 402 is fixedly connected to the output end of the linear motor 3. The linear motor 3 adopts an electric linear module, and the specific model is not limited.

[0064] like Figure 6 As shown, the limiting ring 4 is a cylindrical structure, and a spiral shaping protrusion 401 is arranged on the inner surface of the limiting ring 4, wherein the cross section of the shaping protrusion 401 is square, and the corners of the square are rounded. In addition, the connection between the two ends of the shaping protrusion 401 and the inner surface of the limiting ring 4 is an arc transition, thereby protecting the outer wall of the expansion tube 2 from being cut by the shaping protrusion 401.

[0065] During the water delivery process, the shaping protrusion 401 abuts against the outer wall of the expansion tube 2, and forms a spiral indentation on the inner wall of the expansion tube 2 that protrudes toward the inside of the expansion tube 2. The spiral indentation promotes the formation of a vortex of water flowing through the limit ring 4, thereby increasing the flow rate of the water flowing through the limit ring 4 and improving the flushing effect of the water flow on the surface of the filter element 1.

[0066] During the movement of the limiting ring 4, the surface of the expansion tube 2 may be damaged by wear and tear, and may also burst due to excessive expansion. To solve these problems, the wastewater treatment equipment also includes a limiting cylinder 5, an oil injection ring 6 and an outer cylinder 7.

[0067] The limiting cylinder 5 is used to limit the maximum expansion radius of the expansion tube 2. Figure 3As shown, the limiting cylinder 5 is sleeved on the outside of the expansion tube 2 and fixed between the two mounting flanges 201; when the expansion tube 2 expands, it is limited by the limiting cylinder 5, that is, the outer surface of the expansion tube 2 contacts the inner surface of the limiting cylinder 5, thereby forming a limit, and further limiting the maximum expansion radius of the expansion tube 2 to prevent the expansion tube 2 from bursting.

[0068] At the same time, an avoidance opening 501 is provided on the side of the limit cylinder 5 and at the position corresponding to the linear motor 3, and the connecting part 402 passes through the avoidance opening 501 and is slidably connected, wherein the avoidance opening 501 extends along the conveying square of the linear motor 3 and is in a rectangular shape; when the linear motor 3 drives the limit ring 4 to move, the connecting part 402 slides in the avoidance opening 501.

[0069] The function of the oil spray ring 6 is to spray lubricating oil onto the surface of the expansion tube 2 to reduce the friction between the limit ring 4 and the expansion tube 2, reduce wear and tear, and increase service life; Figure 3 As shown, the oil injection ring 6 is sleeved on the outside of the expansion tube 2 and fixed on one end of the limiting ring 4. To achieve the above effect, a plurality of oil injection ports facing the expansion tube 2 are arranged on the inner ring of the oil injection ring 6. At the same time, to facilitate the injection of lubricating oil, an oil injection nozzle 61 is arranged on the side of the oil injection ring 6, and oil is injected through the oil injection nozzle 61.

[0070] In addition, in order to reduce water resistance, such as Figure 8 As shown, the two ports at both ends of the limit ring 4 are both in the shape of a trumpet, and the outer edge of the trumpet is provided with an arc chamfer to prevent cutting the expansion tube 2; when the limit ring 4 constrains the hydraulic radius of the expansion tube 2, the trumpet shape can make the part of the expansion tube 2 at the port of the limit ring 4 form a cone shape, thereby reducing the water resistance and allowing the sewage to enter the expansion tube 2 inside the limit ring 4 more smoothly.

[0071] like Figure 3 As shown, the function of the outer cylinder 7 is to prevent the lubricating oil from dripping onto the ground. One end of the outer cylinder 7 is sleeved on one of the mounting flanges 201 and fixedly connected, and the other end is sleeved on another mounting flange 201 and fixedly connected. The outer cylinder 7 is used to encapsulate the limiting cylinder 5, so that the lubricating oil is not easy to drip onto the ground.

[0072] In addition, in the above structure, the limiting ring 4 is loosely fitted in the limiting cylinder 5 , that is, the limiting ring 4 can move in the limiting cylinder 5 .

[0073] In addition, in order to facilitate the oiling of the oiling nozzle 61, Figure 4 As shown, a first oil injection hole 502 is provided through the side of the limiting cylinder 5 and at the position corresponding to the oil injection nozzle 61; Figure 1As shown, a second oil filling hole 701 is provided through the side of the outer tube 7 at a position corresponding to the first oil filling hole 502. When oil filling is needed, the oil filling end of the oil gun is passed through the first oil filling hole 502 and the second oil filling hole 701, docked with the oil filling nozzle 61, and then oil is filled into the oil filling nozzle 61; when oiling, the lubricating oil is sprayed from the oil spray port to the surface of the expansion tube 2 to lubricate the surface of the expansion tube 2. After oiling, the oil gun is removed, and then a rubber plug is embedded in the inner side of the second oil filling hole 701 to seal the second oil filling hole 701.

[0074] When the wastewater treatment equipment is actually used, a raw water inlet pipe 8 is provided at one end of the expansion pipe 2, and a concentrated water outlet pipe 9 is provided at the other end. The expansion pipe 2 is assembled on the water supply pipeline of the incineration equipment through the raw water inlet pipe 8 and the concentrated water outlet pipe 9.

[0075] like Figure 3 As shown, the raw water inlet pipe 8 is coaxial with the expansion tube 2, and the clean water delivery part 104 passes through the raw water inlet pipe 8, and an end plate 105 is arranged on the side of the clean water delivery part 104, wherein the end plate 105 is fixedly connected to one end of the raw water inlet pipe 8, and the other end of the raw water inlet pipe 8 is fixedly connected to one of the mounting flanges 201; in addition, a raw water inlet port 801 is arranged on the side of the raw water inlet pipe 8, wherein the raw water inlet port 801 is a tubular structure, and sewage enters the raw water inlet pipe 8 from the raw water inlet port 801.

[0076] The above-mentioned concentrated water outlet pipe 9 is coaxially arranged with the expansion pipe 2, and the concentrated water outlet pipe 9 is fixedly connected with another mounting flange 201, for the convenience of installation and connection, as shown in FIG. Figure 3 As shown, flange structures are provided at both ends of the raw water inlet pipe 8 , both ends of the concentrated water outlet pipe 9 , and one end of the raw water inlet 801 away from the raw water inlet pipe 8 .

[0077] In addition, when cleaning the wastewater treatment equipment, backblowing can also be used for cleaning, that is, clean compressed air is introduced into the filter element 1, and the compressed air passes through the filter element 1 to blow away impurities on the outer surface of the filter element 1. The impurities blown away are flushed and taken away by sewage.

[0078] The above wastewater treatment equipment is mainly used for high COD wastewater treatment, and its wastewater treatment method includes the following steps:

[0079] S1. Connect the raw water inlet 801 to the sewage delivery pipeline, connect the concentrated water outlet pipe 9 to the water inlet of the incineration equipment, pressurize the sewage to be treated, and input the pressurized sewage from one end of the expansion tube 2. During the process, the sewage drives the expansion tube 2 to expand, and the reaction force after the expansion increases the osmotic pressure inside the expansion tube 2, thereby improving the filtration efficiency and filtration effect of the filter element 1. The filtered sewage is concentrated into concentrated sewage water, which is discharged from the other end of the expansion tube 2, and the inside of the filter element 1 obtains clean sewage water, which is discharged from the clean water outlet 101;

[0080] S2. During the filtering process, the linear motor 3 drives the limit ring 4 to move linearly from one end of the expansion tube 2 where water is discharged to the other end, and then moves in the opposite direction and returns to its original position, thereby realizing a reciprocating motion of the limit ring 4, or a reciprocating motion. During the reciprocating motion of the limit ring 4, the expansion tube 2 is partially contracted and returned to its original position, so as to reduce the local hydraulic radius of the water flow channel 102 and increase the flow velocity of the water flowing through the limit ring 4. At the same time, a spiral indentation is formed on the inner wall of the expansion tube 2 through the shaping protrusion 401 on the inner wall of the limit ring 4, so as to promote the water flowing through the limit ring 4 to form a vortex, increase the flow velocity of the water flowing through the limit ring 4, and improve the flushing effect of the water flow on the surface of the filter element 1 after two accelerations;

[0081] S3, the linear motor 3 is powered on intermittently, such as the limit ring 4 is powered off after moving back and forth once or several times, and the linear motor 3 is powered on again after waiting for a period of time (such as one hour), and the limit ring 4 is driven to perform the reciprocating action described in S2. In addition, in step S2, during cleaning, the input pressure of the sewage can be appropriately reduced to facilitate the contraction of the expansion tube 2, thereby facilitating the sliding of the limit ring 4 and the expansion tube 2.

[0082] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wastewater treatment device, comprising a filter element (1), characterized in that: It also includes an expansion tube (2), a linear motor (3) and a limit ring (4), wherein: The expansion tube (2) is an elastic rubber tube, and mounting flanges (201) are provided on both ends of the expansion tube (2); One end of the filter element (1) is closed, and the other end is provided with a clean water outlet (101); the closed end of the filter element (1) is coaxially arranged on the inner side of the expansion tube (2), and a water flow channel (102) is formed between the expansion tube (2) and the filter element (1); The linear motor (3) is parallel to the expansion tube (2) and is fixed between the two mounting flanges (201); the output end of the linear motor (3) is fixedly connected to the limiting ring (4); The limiting ring (4) is sleeved on one end of the expansion tube (2) away from the clean water outlet (101), and the limiting ring (4) is slidably connected to the expansion tube (2). The linear motor (3) is used to drive the limiting ring (4) to reciprocate, so that the limiting ring (4) forces the local hydraulic radius of the water flow channel (102) to decrease, thereby increasing the local water flow velocity; The limiting ring (4) is a cylindrical structure, and a spiral shaping protrusion (401) is provided on the inner surface of the limiting ring (4), wherein the shaping protrusion (401) abuts against the outer wall of the expansion tube (2) and forms a spiral indentation on the inner wall of the expansion tube (2) that protrudes toward the interior of the expansion tube (2).

2. A wastewater treatment equipment according to claim 1, characterized in that: One end of the expansion tube (2) is provided with a raw water input port (202), and the other end is provided with a concentrated water output port (203), wherein: The filter element (1) passes through the raw water inlet (202).

3. A wastewater treatment equipment according to claim 2, characterized in that: The filter element (1) comprises a filtering portion (103) and a clean water conveying portion (104), wherein: The filter portion (103) is a cylindrical structure, the length of the filter portion (103) is smaller than the length of the expansion tube (2), and the filter portion (103) is centrally arranged in the expansion tube (2); The clean water delivery part (104) is a tubular structure, and one end of the clean water delivery part (104) is embedded in and fixed in the barrel opening of the filter part (103), and the other end is the clean water outlet (101).

4. A wastewater treatment equipment as claimed in claim 3, characterized in that: One end of the filter portion (103) close to the clean water delivery portion (104) is in a cone shape.

5. A wastewater treatment equipment as claimed in claim 4, characterized in that: A raw water delivery channel (204) is formed between the expansion pipe (2) and the clean water delivery portion (104), and a concentrated water delivery channel (205) is formed inside one end of the expansion pipe (2) provided with the limit ring (4), wherein: The concentrated water delivery channel (205) is connected to the raw water delivery channel (204) via the water flow channel (102).

6. A wastewater treatment equipment according to claim 1, characterized in that: A connecting portion (402) is provided on the outer wall of the limiting ring (4), wherein: The connecting portion (402) is fixedly connected to the output end of the linear motor (3).

7. A wastewater treatment equipment according to claim 6, characterized in that: It also includes a limiting cylinder (5), an oil injection ring (6) and an outer cylinder (7), wherein: The limiting cylinder (5) is sleeved on the outside of the expansion tube (2) and fixed between the two mounting flanges (201), and the limiting ring (4) is loosely fitted inside the limiting cylinder (5); An escape opening (501) is provided on the side of the limiting cylinder (5) and at a position corresponding to the linear motor (3), and the connecting portion (402) passes through the escape opening (501) and is slidably connected; The oil injection ring (6) is sleeved on the outside of the expansion tube (2) and fixed on one end of the limiting ring (4); an oil injection nozzle (61) is provided on the side of the oil injection ring (6); A first oil injection hole (502) is provided through the side of the limiting cylinder (5) at a position corresponding to the oil injection nozzle (61); One end of the outer cylinder (7) is sleeved on one of the mounting flanges (201) and fixedly connected, and the other end is sleeved on the other mounting flange (201) and fixedly connected. A second oil injection hole (701) is provided through the side of the outer cylinder (7) at a position corresponding to the first oil injection hole (502).

8. A wastewater treatment equipment as claimed in claim 3, characterized in that: It also includes a raw water inlet pipe (8) and a concentrated water outlet pipe (9), wherein: The raw water inlet pipe (8) is coaxially arranged with the expansion pipe (2), and the clean water delivery portion (104) penetrates the raw water inlet pipe (8). An end plate (105) is provided on the side of the clean water delivery portion (104), and the end plate (105) is fixedly connected to one end of the raw water inlet pipe (8). The other end of the raw water inlet pipe (8) is fixedly connected to one of the mounting flanges (201). A raw water inlet port (801) is provided on the side of the raw water inlet pipe (8); The concentrate water outlet pipe (9) is coaxial with the expansion pipe (2), and the concentrate water outlet pipe (9) is fixedly connected to another mounting flange (201).

9. A wastewater treatment method, using a wastewater treatment device as claimed in claim 7, characterized in that: The following steps are involved: S1. Pressurizing the sewage to be treated and inputting the pressurized sewage from one end of the expansion tube (2). During the process, the sewage drives the expansion tube (2) to expand, and the reaction force after the expansion increases the osmotic pressure inside the expansion tube (2), thereby improving the filtering efficiency and filtering effect of the filter element (1). The filtered sewage is concentrated into sewage concentrated water, which is discharged from the other end of the expansion tube (2). Sewage clean water is obtained inside the filter element (1), and the sewage clean water is discharged from the clean water outlet (101); S2. During the filtering process, the linear motor (3) drives the limit ring (4) to move linearly from one end of the expansion tube (2) where water flows out to the other end, and then moves in the opposite direction and returns to its original position. During the reciprocating movement of the limit ring (4), the expansion tube (2) is partially contracted and returned to its original position, so as to reduce the local hydraulic radius of the water flow channel (102) and increase the flow rate of the water flowing through the limit ring (4). At the same time, a spiral indentation is formed on the inner wall of the expansion tube (2) through the shaping protrusion (401) on the inner wall of the limit ring (4), so as to promote the water flowing through the limit ring (4) to form a vortex, increase the flow rate of the water flowing through the limit ring (4), and improve the flushing effect of the water flow on the surface of the filter element (1) after two accelerations.

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