A precision sand removal device

Abstract

The present invention discloses a precision sand removal device, comprising: a sand collection cylinder is provided at the bottom of the outer cylinder body; a sedimentation cylinder is arranged inside the outer cylinder body, and the sedimentation cylinder is above the sand collection cylinder; a diversion cylinder is arranged inside the outer cylinder body and is sleeved around the outer periphery of the sedimentation cylinder at intervals; at least one layer of C-shaped flow pressing plates is arranged below and on the outer periphery of the diversion cylinder; a water inlet is arranged on the outer cylinder body, below the front end of the C-shaped flow pressing plate and is communicated with the inside of the outer cylinder body; a diversion groove is arranged on the outer cylinder body at the water inlet; a water outlet pipe is arranged at the upper end of the outer cylinder body, the front end of the water outlet pipe is communicated with the inside of the diversion cylinder, and the rear end of the water outlet pipe is the water outlet. Under the action of the C-shaped flow pressing plates arranged below the diversion cylinder inside the outer cylinder body, the precision sand removal device can comb the incoming water flow state. When the water flow moves to the end of the C-shaped flow pressing plate, the upper fluid generates a diffusion effect, forming two-way swirls, improving the sand sedimentation effect, and realizing good sand-water separation. Due to multiple swirl sand sedimentation and the sedimentation area formed at the spiral center, sand grains with a particle size of 0.1 mm and above can be removed.

Description

Technical Field

[0001] The present invention relates to the field of sewage treatment, and particularly to a precision sand removal device. Background Art

[0002] In the water treatment process, the function of the grit chamber is to remove inorganic and organic particles with a relatively large density in the water. It is generally installed in front of the pumping station, inverted siphon, and sedimentation tank. At present, the grit removal processes adopted at home and abroad, such as horizontal flow grit chambers, aerated grit chambers, and mechanical cyclone grit chambers, are relatively common, and usually take grit with a size greater than 200 microns as the sand removal design standard. However, due to the differences in geological terrain in different regions, most of the grit particle sizes in the sewage influent are < 200 microns. These large amounts of fine grit enter the subsequent treatment units, bringing serious adverse effects to the operation and production of the sewage treatment plant:

[0003] (1) When the grit flows into the biochemical tank and accumulates in the biochemical tank, it will reduce the effective volume of units such as the biochemical tank and reduce the system's ability to remove nitrogen and phosphorus.

[0004] (2) When the grit enters the primary sedimentation tank, it will cause the VSS / TS of the primary sediment sludge to become smaller, affect the gas production rate of sludge anaerobic digestion, and cause sand accumulation at the bottom of the digestion tank and wear and blockage of the sludge pipeline.

[0005] (3) During the sludge dewatering process, the fine sand in the sludge also has an impact on dewatering, blocking the micropores in the filter cloth of the belt filter press, reducing the water permeability of the filter cloth, and thus reducing the sludge cake formation rate.

[0006] Therefore, sand removal can reduce the wear of mechanical components and sludge pumps in the subsequent process flow, reduce pipeline blockage, reduce sludge load, improve the water treatment conditions, avoid the accumulation of sand particles in the aeration tank and sludge digestion tank, prevent the blockage of aeration nozzles, maintain the effective volume of the sludge treatment structure, increase the content of sludge organic components, and increase the value of sludge as fertilizer.

[0007] In view of this, the present invention is specifically proposed. Summary of the Invention

[0008] The object of the present invention is to provide a precision sand removal device that can effectively remove various sand particles with smaller particle sizes that are not easy to settle only by the swirling flow state formed by the water flow without aeration or mechanical stirring, has a high sand removal efficiency, does not divert the aeration air for the subsequent biochemical tank, has no mechanical stirring, saves energy consumption, and is also conducive to realizing sand-water separation, thereby solving the above technical problems existing in the prior art.

[0009] The object of the present invention is achieved by the following technical solutions:

[0010] An embodiment of the present invention provides a precision sand removal device, including:

[0011] An outer cylinder, a sand collecting cylinder, a sedimentation cylinder, a guiding cylinder, at least one layer of C-shaped flow pressing plates, a water inlet, a drainage groove, a water outlet pipe and a water outlet; wherein,

[0012] The sand collecting cylinder is arranged at the bottom of the outer cylinder;

[0013] The sedimentation cylinder is arranged inside the outer cylinder and is above the sand collecting cylinder;

[0014] The guiding cylinder is arranged inside the outer cylinder and is sleeved around the outer periphery of the sedimentation cylinder at intervals;

[0015] At least one layer of C-shaped flow pressing plates is arranged below and around the guiding cylinder, and an interval opening is arranged between the front end and the rear end of each layer of C-shaped flow pressing plates;

[0016] The water inlet is arranged on the outer cylinder and is below the front end of the lowermost layer of C-shaped flow pressing plates and is communicated with the inside of the outer cylinder;

[0017] The drainage groove is arranged on the outer cylinder at the water inlet;

[0018] The water outlet pipe is arranged at the upper end of the outer cylinder, the front end of the water outlet pipe is communicated with the inside of the guiding cylinder, and the rear end of the water outlet pipe is the water outlet.

[0019] Compared with the prior art, the precision sand removal equipment provided by the present invention has the following beneficial effects:

[0020] By arranging at least one layer of C-shaped flow pressing plates below and on the outer periphery of the guide cylinder inside the outer cylinder, when the water flow in the swirling sand sedimentation process moves from the drainage groove to the end of the C-shaped flow pressing plate at the same height as the drainage groove, two water flows will be formed: one water flow diffuses upward to form a swirling upward moving water flow. After diffusing to the C-shaped flow pressing plate of the slightly higher layer, the movement direction is changed under the action of the flow pressing plate to form a spiral downward return flow, which converges with other spiral downward water flows and always flows towards the sand collecting cylinder; the other water flow still spirals downward along the inner wall of the outer cylinder in the previous swirl and flows towards the sand collecting cylinder. The diversion effect of the C-shaped flow pressing plate reduces the flow rate of the water flow directly diffusing upward, increases the flow rate of the downward spiral water, prolongs the residence time, and more sedimented sand grains will be carried, improving the sand removal effect. In addition, when different water flows carry the internal sand grains and descend, under the comprehensive action of gravity, the sand grains slide downward along the inner wall surface of the outer cylinder and are deposited in the bottom sand collecting cylinder, which also well realizes the separation of sand and water. Since it is multiple swirling sand sedimentations after diversion, the residence time is guaranteed, and small particle size sand grains with lighter weight (including sand grains of 0.1 mm) can also be effectively removed. At the same time, in the center of the water flow spiraling downward or upward, a sedimentation area with a very small water flow velocity is formed, and the isolation of the sedimentation cylinder strengthens the difference between the two areas. After the water flow spirals downward to the sand collecting cylinder, in the vertical sedimentation area, it slowly overflows upward to the upper part of the sedimentation cylinder and discharges the purified water flow through the water outlet pipe. During the overflow process, fine sand grains settle to the sand collecting cylinder by gravity, thus further realizing the efficient capture of fine particle size sand grains. The comprehensive action of the above two flow states makes the sand removal efficiency of the precision sand removal equipment much higher than that of the traditional sand removal equipment, and at the same time, the sand removal particle size range is further widened downward to 0.1 mm. This precision sand removal equipment can effectively remove various sand grains with smaller particle sizes that are not easy to settle only by the swirling flow state formed by the water flow under the action of the C-shaped flow pressing plate without the state of aeration or mechanical stirring, has a high sand removal efficiency, will not divert the aeration gas of the subsequent biochemical pool, has no mechanical stirring, saves energy consumption, and is also conducive to realizing the separation of sand and water. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a structural schematic diagram of a mechanical swirling sand sedimentation tank provided by the prior art.

[0023] Figure 2 It is a structural schematic diagram of the precision sand removal equipment provided by Embodiment 1 of the present invention.

[0024] Figure 3 Schematic structural diagram of the precision sand removal equipment provided in Embodiment 2 of the present invention.

[0025] Figure 4 Front view structural diagram of the precision sand removal equipment provided in Embodiment 3 of the present invention.

[0026] Figure 5 Front view plane structural diagram of the precision sand removal equipment provided in Embodiment 4 of the present invention.

[0027] Figure 6 Side view plane structural diagram of the precision sand removal equipment provided in Embodiment 5 of the present invention.

[0028] Figure 1 Each label in the figure is: 101 - sand discharge pipe; 102 - compressed air delivery pipe; 103 - separation area; 104 - sand collection area; 105 - variable speed motor; 106 - driving gear; 107 - outflow port; 108 - rotating shaft; 109 - inflow port; 110 - turntable and blade; 111 - sand lifting pipe. Detailed implementation manners

[0029] Next, in combination with the specific content of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments, which does not constitute a limitation to the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0030] First, the following explanations are made for the terms that may be used in this article:

[0031] The term "and / or" means that either or both of the two can be realized. For example, X and / or Y means that it includes both the case of "X" or "Y" and the three cases of "X and Y".

[0032] Descriptions with semantic meanings such as "including", "comprising", "containing", "having" or other similar ones should be interpreted as non-exclusive inclusions. For example: including a certain technical feature element (such as raw material, component, ingredient, carrier, dosage form, material, size, part, component, mechanism, device, step, process, method, reaction condition, processing condition, parameter, algorithm, signal, data, product or article, etc.) should be interpreted as not only including the clearly listed certain technical feature element, but also including other technical feature elements well known in the art that are not clearly listed.

[0033] The term "consisting of" means excluding any technical feature elements not expressly listed. If this term is used in a claim, it will make the claim a closed type, so that it does not include technical feature elements other than the expressly listed ones, except for the conventional impurities related thereto. If this term only appears in a certain clause of a claim, then it only limits the elements expressly listed in that clause, and the elements recorded in other clauses are not excluded from the overall claim.

[0034] Unless otherwise expressly specified or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example: it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0035] When a concentration, temperature, pressure, size or other parameter is expressed in the form of a numerical range, this numerical range should be understood as specifically disclosing all ranges formed by the pairing of any upper limit value, lower limit value, and preferred value within this numerical range, regardless of whether this range is expressly recorded. For example, if the numerical range "2 to 8" is recorded, then this numerical range should be interpreted as including ranges such as "2 to 7", "2 to 6", "5 to 7", "3 to 4 and 6 to 7", "3 to 5 and 7", "2 and 5 to 7", etc. Unless otherwise specified, the numerical ranges recorded in this article include both their end values and all integers and fractions within this numerical range.

[0036] The orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description and simplification of the description, rather than expressly or implicitly indicating that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to this article.

[0037] The precision sand removal equipment provided by the present invention will be described in detail below. The content not described in detail in the embodiments of the present invention belongs to the prior art well-known to those of ordinary skill in the art. For those conditions not specified in the embodiments of the present invention, they are carried out according to the conventional conditions in the art or the conditions recommended by the manufacturer. For the reagents or instruments not indicating the manufacturer in the embodiments of the present invention, they are all conventional products that can be obtained through commercial purchase.

[0038] Such as Figure 2As shown in the figure, an embodiment of the present invention provides a precision sand removal device, including:

[0039] An outer cylinder 1, a sand collecting cylinder 2, a sedimentation cylinder 3, a diversion cylinder 4, at least one layer of C-shaped flow pressing plates 5, a water inlet 6, a drainage groove 9, a water outlet pipe 7 and a water outlet 8; wherein,

[0040] The sand collecting cylinder 2 is arranged at the bottom of the outer cylinder 1;

[0041] The sedimentation cylinder 3 is arranged inside the outer cylinder 1 and is above the sand collecting cylinder 2;

[0042] The diversion cylinder 4 is arranged inside the outer cylinder 1 and is sleeved around the outer circumference of the sedimentation cylinder 3 at intervals;

[0043] At least one layer of C-shaped flow pressing plates 5 is arranged below and around the diversion cylinder 4, and there is an interval opening between the front end and the end of each layer of C-shaped flow pressing plates 5;

[0044] The water inlet 6 is arranged on the outer cylinder 1 and is below the front end of the lowermost layer of C-shaped flow pressing plates 5 and is communicated with the inside of the outer cylinder 1;

[0045] The drainage groove 9 is arranged on the outer cylinder 1 at the water inlet 6;

[0046] The water outlet pipe 7 is arranged at the upper end of the outer cylinder 1. The front end of the water outlet pipe 7 is communicated with the inside of the diversion cylinder 4, and the rear end of the water outlet pipe 7 is the water outlet 8.

[0047] As Figures 3 - 6 shown, in the above-mentioned precision sand removal device, the C-shaped flow pressing plates 5 are arranged in 2 to 7 layers at equal intervals from top to bottom, and the interval openings of each layer of C-shaped flow pressing plates 5 are arranged staggeredly;

[0048] The lowermost layer of C-shaped flow pressing plates 5 is below the diversion cylinder 4;

[0049] The other layers of C-shaped flow pressing plates 5 are around the diversion cylinder 4.

[0050] Referring to Figure 4 , in the above-mentioned precision sand removal device, the distance Δh between two adjacent layers of C-shaped flow pressing plates 5 from bottom to top is calculated and determined by the following formula, and the calculation formula is:

[0051] Δh = (h 出 -h 入 ) / (n - 1);

[0052] Wherein, Δh is the distance between adjacent C-shaped flow pressing plates in the height direction, and the unit is mm;

[0053] h 出h is the height from the bottom of the water outlet pipe 7 to the bottom surface of the sand collecting cylinder 2, with the unit of mm;

[0054] h 入 n is the height from the C-shaped flow pressing plate at the water inlet 6 to the bottom surface of the sand collecting cylinder 2, with the unit of mm;

[0055] n is the number of layers of the C-shaped flow pressing plate, and n is a positive integer greater than or equal to 2. According to the above formula, Δh is taken as ≥ 250 mm.

[0056] Setting multiple layers of C-shaped flow pressing plates can better comb the water inlet flow pattern, increase the time of the swirling flow pattern to a certain extent, that is, increase the residence time, and improve the sand removal efficiency; each layer of C-shaped guide plates is provided with spaced openings, which can guide the water flow to spiral downward smoothly; the spaced openings of each layer of C-shaped flow pressing plates are staggered, which can achieve flow pressing during the process of guiding the water flow to spiral downward. Without changing the residence time, more water flow can spiral downward, and more time can be used for the water flow to overflow in the middle sedimentation area. The residence time affects the water treatment capacity. After increasing the sand removal efficiency by increasing the residence time to a certain extent, the water flow rate of water treatment will be reduced. To avoid this problem, multiple layers of flow pressing plates arranged in a staggered manner are set.

[0057] It can be known that the number of layers of the C-shaped flow pressing plates can be determined according to the size of the entire outer cylinder 1 and the size of the water inlet 6. For example, if the size of the outer cylinder 1 is larger, 2-7 layers of flow pressing plates can be set. If the size of the water inlet 6 is larger, to better comb the water inlet flow pattern, more layers of C-shaped flow pressing plates can also be set. The circumferential angle corresponding to each layer of C-shaped guide plate is 240°.

[0058] In the above-mentioned precision sand removal equipment, each layer of C-shaped flow pressing plate 5 is of a C-shaped plate structure, and is arranged around the inner wall of the outer cylinder 1 below and on the outer periphery of the guide cylinder 4, and is in the middle part inside the outer cylinder 1.

[0059] In the above-mentioned precision sand removal equipment, the sedimentation cylinder 3 is composed of a straight cylinder 31 in the upper part and a flared mouth 32 connected to the bottom of the straight cylinder 31. The flared mouth 32 is above the sand collecting cylinder 2 and is spaced from the sand collecting cylinder 2;

[0060] The upper outer periphery of the straight cylinder 31 is provided with an upper water outlet.

[0061] In the above-mentioned precision sand removal equipment, a guide pipe or a water inlet channel is connected to the water inlet 6.

[0062] In the above-mentioned precision sand removal equipment, the bottom of the outer cylinder 1 is of a frustum-shaped structure.

[0063] In the above-mentioned precision sand removal equipment, the water outlet pipe 7 is of a corridor structure or a circular pipe structure.

[0064] In the above-mentioned precision sand removal equipment, the outer cylinder 1, the sand collecting cylinder 2, the sedimentation cylinder 3, and the diversion cylinder 4 are all cylindrical structures.

[0065] In summary, in the precision sand removal equipment of the embodiment of the present invention, the height of the water inlet is lower than the position of the water outlet, and the water inlet is tangential to the outer cylinder and enters in a full pipe flow manner. After the water body enters the outer cylinder from the water inlet, under the action of one or more layers of C-shaped flow pressing plates arranged below or on the outer periphery of the diversion cylinder in the outer cylinder, the water body is generally diffused into two water flows. One water flow spirals downward, and the other water flow first spirals upward from the water inlet, then spirals downward after reaching the top (or the upper layer of the flow pressing plate). That is, when the water flow at the water inlet moves to the end of the C-shaped flow pressing plate, the upper fluid produces a diffusion effect. One way is to swirl upward and form a backflow above the C-shaped flow pressing plate, and the other way still spirals downward along the previous swirl. When different water flows carry the internal sand grains and descend, under the comprehensive action of gravity, the sand grains slide downward along the inner wall surface of the outer cylinder and are deposited in the bottom sand collecting cylinder, realizing sand-water separation. By setting the C-shaped flow pressing plates, the incoming water flow pattern can be well sorted. This flow pattern is beneficial for the water body to carry sand grains and settle to the sand collecting cylinder. The spiral flow pattern forms a sedimentation area with a very low speed in the center of the pool body. The water flow can pass through the sedimentation area and slowly rise to the middle sedimentation cylinder in an overflow manner, and then move to the water outlet through the diversion cylinder and be discharged. The swirl flow pattern that first goes downward and then upward not only increases the residence time of the water body in the outer cylinder, but also creates a sedimentation area in the center of the equipment that is conducive to the sedimentation of fine sand, thereby achieving the effect of finer sand removal particle size and higher sand removal efficiency. Due to multiple swirl sand sedimentations in this flow pattern, the sedimentation time is prolonged, ensuring that small particle size sand grains with lighter weights can also settle to the sand collecting cylinder, effectively removing sand grains with a particle size of 0.1 mm. In addition, therefore, compared with the existing mechanical swirl sand sedimentation tank, the precision sand removal equipment of the present invention has a longer sewage residence time and has key sedimentation areas for sand sedimentation, so the sand sedimentation efficiency is higher. At the same time, the precision sand removal equipment does not require mechanical stirring and aeration, and the operating energy consumption is lower.

[0066] In order to more clearly show the technical solutions provided by the present invention and the technical effects produced, the precision sand removal equipment provided by the embodiment of the present invention will be described in detail below with specific embodiments. Embodiment

[0067] As Figure 1 shown, the embodiment of the present invention provides a precision sand removal equipment, which is composed of an outer cylinder, a water inlet, a drainage trough, a sand collecting cylinder, a sedimentation cylinder, a layer of C-shaped flow pressing plates, a diversion cylinder, an outlet channel, and a water outlet. Taking the operation process of a certain water plant as an example, the sand removal process of the precision sand removal equipment of this embodiment is as follows:

[0068] The sewage is introduced into the outer cylinder 1 of the precision sand removal equipment through the diversion pipe 10 connected to the water inlet 6. According to the upstream and downstream conditions, the full-pipe drainage method is preferably adopted for the water inlet. For technical renovation projects, it can be set as channel water inlet according to the site conditions on the premise of ensuring the inlet water flow velocity.

[0069] After the sewage is introduced into the outer cylinder 1 of the precision sand removal equipment, it first passes through the drainage groove 9. The drainage groove 9 guides the water flow to enter the outer cylinder 1 at a set speed and in a certain direction. Affected by the comprehensive effect of the fluid Coanda effect and gravity, the water flow moves forward along the inner wall surface of the outer cylinder 1. In the area between the inner wall surface of the outer cylinder 1 and the settling cylinder 3, a spiral downward swirling motion mode in the clockwise direction (observed from the top view) is formed; the large and small sand grains carried in the sewage swirl are deposited into the sand collection cylinder 2 at the bottom of the outer cylinder 1 along the inner wall surface of the outer cylinder 1 under the action of gravity and centrifugal force, forming a sand-water concentration area.

[0070] Under the action of the C-shaped flow pressing plate 5 on the first layer, when the water flow moves to the end 11 of the C-shaped flow pressing plate, the upper fluid will form a diffusion effect. From here, the water flow is divided into two paths. One path swirls upward to above the C-shaped flow pressing plate 5, and the other path still swirls and spirals downward along the previous path.

[0071] One path of the water flow that swirls upward to above the C-shaped flow pressing plate 5 flows to the top of the water flow (i.e., the water surface in contact with the air), and then collides with the wall surface at the first wall surface 12 and the second wall surface 13 at the water outlet, forming a backflow, and flowing downward along the first wall surface 12 and the second wall surface 13, converging with the water flow between the inner wall surface of the outer cylinder 1 and the settling cylinder 3; when the water flow carries the internal sand grains and descends, under the comprehensive action of gravity, the particles slide downward along the wall surface and are deposited into the bottom sand collection cylinder 2.

[0072] After the water flow between the inner wall surface of the settling cylinder 3 and the outer cylinder 1 converges to the lower bell mouth 32 of the settling cylinder 3, it is divided into two parts. One part of the water flow continues to spiral downward along the inner wall surface of the outer cylinder 1, carrying sand grains to the center of the sand collection cylinder 2; the other part of the water flow overflows upward at the bell mouth 32, and the speed is much smaller than the water flow speed at the outer wall surface, forming a sedimentation area for sand-water separation. The sand grains that cannot be carried to the sand collection cylinder 2 by the outer swirl settle to the sand collection cylinder 2 by gravity; the water flow in the settling cylinder 3 slowly overflows upward to the guide cylinder 4. There is a water outlet inner port 14 (a rectangular small port can be adopted) at the top of the settling cylinder 3. The internal water flow rotates and flows out from this water outlet inner port to the water outlet corridor serving as the water outlet pipe 7, and is discharged into the next water treatment structure through the water outlet at the end of the water outlet corridor 8. Thus, a sand removal process is completed.

[0073] It can be seen from the above sand removal process that, due to the setting of the C-shaped flow pressing plate 5, the inflow water state is well combed, the residence time of the water flow in the outer cylinder 1 is extended, and thus the sedimentation time of the sand grains in the water flow is increased, enabling small-sized sand grains with light weight (such as sand grains with a particle size of 0.1 mm) to effectively settle to the sand collecting cylinder, and improving the removal efficiency of small-sized sand grains (such as sand grains with a particle size of 0.1 mm).

[0074] According to the actual use conditions, the full-pipe inflow is preferably selected for the water inlet. If the site is a channel inlet, the water inlet can be designed and modified according to the treatment capacity requirements to achieve the same inlet conditions. In this embodiment, the channel outlet is adopted for the water outlet, and according to the actual conditions, it can also be changed to a circular pipe water outlet. The internal reverse flow structure size can be adjusted and designed specifically according to the situation of the water inlet and outlet. This device is more flexible and targeted in solving the sand removal problem. Embodiment

[0075] As Figures 2 - 5 As shown, the embodiment of the present invention provides a precision sand removal device, whose structure is basically the same as that of the precision sand removal device in Embodiment 1, the difference being that multiple layers of C-shaped flow pressing plates 5 are provided. Among them, the lowermost layer of C-shaped flow pressing plate 5 is located below the flow guiding cylinder 4, and the other layers of C-shaped flow pressing plates are located on the outer periphery of the flow guiding cylinder 4, being clamped between the outer wall of the flow guiding cylinder 4 and the outer cylinder 1. The layers of C-shaped flow pressing plates 5 are arranged at intervals in sequence from bottom to top, and the interval openings of the layers of C-shaped flow pressing plates 5 are all staggeredly arranged. This precision sand removal device with multiple layers of C-shaped flow pressing plates 5 can better comb the inflow water state and meet the sand sedimentation requirements of large-sized devices.

[0076] According to the standard that the sand removal particle size is greater than or equal to 0.1 mm and the removal efficiency is more than 85%, the diameter range of the precision sand removal device of the present invention is 2.5 meters to 8.5 meters, and the single-pool water treatment capacity covers 0.5 to more than a dozen ten thousand tons per day. Compared with the traditional sand removal device of the same size, the sand removal cost is reduced by about 50%. At the same time, the costs such as silt cleaning of subsequent structures and the risk of production stoppage are greatly reduced. Taking a water plant in the northwest as an example, due to the deposition of fine sand, the biochemical pool needs to be sand-cleaned once every 3 years, involving a budget of 2.25 million yuan, as well as corresponding human and material resources, equipment wear and maintenance, etc. After the problem of fine sand deposition is solved, the cycle of cleaning the biochemical pool can be extended to 5-6 years, reducing the maintenance cost of the biochemical pool by more than 40% (reducing 300,000 - 375,000 yuan per year on average). The greater the sand content in the water quality, the more the operation and maintenance cost is reduced. The precision sand removal device of the present invention has well solved the sand removal problem in areas where the proportion of small-sized sand grains with a particle size of 0.1 - 0.2 mm is relatively high, improving both the sand removal efficiency and reducing the sand removal cost.

[0077] As described above, it is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims. The information disclosed in the background art part of this article is only intended to deepen the understanding of the overall background art of the present invention, and should not be regarded as an admission or imply in any form that this information constitutes the prior art already known to those skilled in the art.

Claims

1. A precision sand removal device, characterized in that, Comprising: An outer cylinder (1), a sand collecting cylinder (2), a settling cylinder (3), a flow guiding cylinder (4), a C-shaped flow pressing plate (5), a water inlet (6), a drainage groove (9), a water outlet pipe (7) and a water outlet (8); wherein, The sand collecting cylinder (2) is arranged at the bottom of the outer cylinder (1); The settling cylinder (3) is arranged inside the outer cylinder (1), and the settling cylinder (3) is above the sand collecting cylinder (2); The flow guiding cylinder (4) is arranged inside the outer cylinder (1) and is sleeved around the outer circumference of the settling cylinder (3) at intervals; A C-shaped flow pressing plate (5) is arranged below and around the flow guiding cylinder (4), and there is an interval opening between the front end and the end of each layer of C-shaped flow pressing plate (5); The water inlet (6) is arranged on the outer cylinder (1), below the front end of the lowermost layer of C-shaped flow pressing plate (5), and is communicated with the inside of the outer cylinder (1); The drainage groove (9) is arranged on the outer cylinder (1) at the water inlet (6); The water outlet pipe (7) is arranged at the upper end of the outer cylinder (1), the front end of the water outlet pipe (7) is communicated with the inside of the flow guiding cylinder (4), and the rear end of the water outlet pipe (7) is the water outlet (8); The C-shaped flow pressing plates (5) are arranged at equal intervals from top to bottom in 2 to 7 layers, and the interval openings of each layer of C-shaped flow pressing plates (5) are arranged staggeredly; The lowermost layer of C-shaped flow pressing plate (5) is below the flow guiding cylinder (4); The other layers of C-shaped flow pressing plates (5) are around the outer circumference of the flow guiding cylinder (4); Each layer of C-shaped flow pressing plate (5) is of a C-shaped plate structure and is arranged around the inner wall of the outer cylinder (1) below and around the flow guiding cylinder (4), and is in the middle part inside the outer cylinder (1); The bottom of the outer cylinder (1) is of a frustum-shaped structure.

2. The precision sand removal equipment according to claim 1, characterized in that, The distance Δh between two adjacent layers of C-shaped flow pressing plates (5) from bottom to top is calculated and determined by the following formula, and the calculation formula is: Δh = (h 出 -h 入 ) / (n - 1); Wherein, Δh is the distance between adjacent C-shaped flow pressing plates in the height direction, and the unit is mm; h 出 is the height from the bottom of the water outlet pipe (7) to the bottom surface of the sand collecting cylinder (2), with the unit of mm; h 入 is the height of the C-shaped flow pressing plate at the water inlet (6) from the bottom surface of the sand collecting cylinder (2), with the unit of mm; n is the number of layers of C-shaped flow pressing plates, n is a positive integer greater than or equal to 2, and Δh is taken as ≥ 250mm according to the calculation.

3. The precision sand removal equipment according to any one of claims 1-2, characterized in that, The corresponding circumferential angle of the C-shaped plate structure is 240°.

4. The precision sand removal equipment according to any one of claims 1-2, characterized in that The settling cylinder (3) is composed of a straight cylinder (31) at the upper part and a flared mouth (32) connected to the bottom of the straight cylinder (31), and the flared mouth (32) is above the sand collecting cylinder (2) and is spaced from the sand collecting cylinder (2).

5. The precision sand removal equipment according to any one of claims 1-2, characterized in that, A flow guiding pipe or a water inlet channel is connected to the water inlet (6).

6. The precision sand removal equipment according to any one of claims 1-2, characterized in that, The water outlet pipe (7) is of a corridor structure or a circular pipe structure.

7. The precision sand removal equipment according to any one of claims 1-2, characterized in that, The outer cylinder (1), the sand collecting cylinder (2), the settling cylinder (3) and the flow guiding cylinder (4) are all of a cylindrical structure.

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