Small buried sewage treatment equipment capable of preventing sewage backflow

Abstract

The invention discloses small buried sewage treatment equipment capable of preventing sewage backflow, and relates to the technical field of sewage treatment.The small buried sewage treatment equipment comprises a pre-buried shell, the top of the pre-buried shell is fixedly communicated with a pair of air leakage pipes, one side of the top of the pre-buried shell is fixedly communicated with a water inlet pipe, and the other side of the top of the pre-buried shell is fixedly communicated with a water drainage pipe; through the arrangement of a backflow prevention mechanism, when a pushing and pressing plate moves, on one hand, a mud suction rod is driven to be embedded in the bottom of a shell to swing in a reciprocating mode, mud deposited at the bottom of a reaction tank is sucked in, and on the other hand, the pushing and pressing plate can synchronously extrude a telescopic water bag, and water in the telescopic water bag is discharged into a first liquid adding pipe and a second liquid adding pipe; water is fed from the top of the reaction tank, and sludge is discharged from the bottom of the reaction tank, so that the water level of the reaction tank does not drop, the phenomenon that sewage flows back in some processes of a conventional sewage treatment system is prevented, and the sewage treatment effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and specifically relates to a small buried sewage treatment device for preventing sewage backflow. Background Art

[0002] A small buried sewage treatment device refers to a device with a compact design and relatively small floor area, usually installed underground or semi-underground, and is used to treat domestic, small commercial or community sewage. This type of device usually adopts biological treatment technologies, such as anaerobic digestion, aerobic biological filter, sequencing batch reactor, etc., which can decompose and remove organic matter in sewage to meet national or local sewage discharge standards;

[0003] In the prior art, sludge is usually generated in several reaction tanks such as a solid-liquid separation tank, an anaerobic filter bed tank, and a biological filler filtration tank. The common sludge discharge method is to pump the slurry into the mud treatment equipment through a fixedly installed suction pipe. However, during the process of pumping the slurry, on the one hand, the water level in the reaction tank will drop, which is likely to cause sewage backflow in some processes of the sewage treatment system, resulting in an increase in the microbial load in the reaction tank, affecting the treatment effect, and even possibly leading to the deterioration of the effluent quality. On the other hand, the current suction pipe for pumping sludge is generally fixedly arranged at the bottom of the reaction tank. Therefore, it needs to be evenly distributed and arranged, which not only increases the installation difficulty and cost, but also easily leads to uneven slurry suction or the situation of mistakenly sucking the water body without slurry above;

[0004] In addition, after the slurry is pumped into the sludge treatment equipment, the slurry is usually separated into solid and liquid under the action of centrifugal force and extrusion force. Currently, the solid mud blocks are usually directly discharged into the aggregate box. Generally, small sludge treatment equipment is cleaned once every six months or one year. However, during the discharging process, most of the mud blocks are directly introduced into the box. In actual situations, most of the mud blocks are concentrated at the discharging port position, making the discharging port become more and more congested, and the discharging rate will gradually decrease. In the long run, it may cause blockage, while the position in the aggregate box far from the discharging port is likely to be empty, which is not conducive to the reasonable allocation of space, thus affecting its space utilization rate.

[0005] In view of this, the present invention proposes a small buried sewage treatment device for preventing sewage backflow to make up for and improve the deficiencies of the prior art. Summary of the Invention

[0006] To solve the above technical problems, the present invention provides a small buried sewage treatment device for preventing sewage backflow, which can improve the efficiency and purity of mud extraction, and can reasonably allocate the collection space, so as to solve the corresponding technical problems raised in the above background art.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows: A small buried sewage treatment device for preventing sewage backflow, including a pre-buried housing, a pair of vent pipes are fixedly connected and communicated at the top of the pre-buried housing, a water inlet pipe is fixedly connected and communicated at one side of the top of the pre-buried housing, a drain pipe is fixedly connected and communicated at the other side of the top of the pre-buried housing, and the small buried sewage treatment device for preventing sewage backflow further includes: a backflow prevention mechanism and a sludge collection mechanism. The backflow prevention mechanism is located inside the pre-buried housing, and the sludge collection mechanism is located outside the pre-buried housing;

[0008] The backflow prevention mechanism is used to efficiently suck the sludge at the bottom of the reaction tank and at the same time ensure that the water level in the reaction tank does not drop to prevent backflow;

[0009] The sludge collection mechanism is used to collect solid sludge and automatically distribute the mud blocks.

[0010] Preferably, the backflow prevention mechanism includes an electric push rod fixedly connected to the inner surface of the bottom of the pre-buried housing. The output end of the electric push rod is fixedly connected with a push plate. The bottom of the push plate is fixedly connected with an H-shaped plate. The bottom of the H-shaped plate is slidably connected to the inner wall of the pre-buried housing. A plurality of turntables are rotatably connected to both sides of the H-shaped plate. A plurality of mud suction rods are fixedly connected to the outer sides of the plurality of turntables. A plurality of round holes are opened on both sides of the outer wall of the mud suction rod. Blades are fixedly connected to the outer wall of the mud suction rod corresponding to the positions of the round holes.

[0011] Preferably, the backflow prevention mechanism further includes a hose fixedly connected to the top of the mud suction rod. The number of hoses is the same as that of the mud suction rods. A plurality of hoses are fixedly penetrated through the inner wall of the pre-buried housing and are jointly fixedly connected with a U-shaped pipe. The outer wall of the U-shaped pipe is fixedly penetrated through the inner wall of the pre-buried housing. One end of the U-shaped pipe far from the hose is fixedly connected and communicated with a slurry pump. The output end of the slurry pump is fixedly connected and communicated with a solid-liquid separator. A servo motor is fixedly connected to one side of the solid-liquid separator. The other side of the solid-liquid separator is fixedly connected and communicated with a sludge discharge pipe. One end of the sludge discharge pipe far from the solid-liquid separator is fixedly penetrated through the top of the pre-buried housing.

[0012] Preferably, the backflow prevention mechanism further includes a water collection tank fixedly connected to the bottom of the solid-liquid separator. The outer wall of the water collection tank is fixedly connected to the inner wall of the pre-buried housing. A connecting water pipe is fixedly connected and communicated at the bottom of the water collection tank. A pair of telescopic water bags are fixedly connected and communicated at one side of the connecting water pipe far from the water collection tank. A second liquid adding pipe is fixedly connected and communicated at one side of each of the pair of telescopic water bags. A first liquid adding pipe is fixedly connected and communicated at the other side of the telescopic water bag. Ball valves are slidably connected to the sides of the second liquid adding pipe and the connecting water pipe close to the telescopic water bag. First springs are fixedly connected to the sides of the ball valves far from the telescopic water bag and are respectively fixedly connected to the inner walls of the second liquid adding pipe and the connecting water pipe.

[0013] Preferably, the sludge collection mechanism includes a collection box fixedly connected to the outer wall of the embedded housing. A box cover is snap-connected to the top of the collection box. A fixing plate is fixedly connected to the top of the collection box. A hemispherical top plate is fixedly connected to the top of the fixing plate. A plurality of arc-shaped plates are also rotatably connected to the top of the fixing plate. The plurality of arc-shaped plates are all located below the hemispherical top plate. Second springs are fixedly connected to the bottoms of the arc-shaped plates. One ends of the plurality of second springs away from the arc-shaped plates are fixedly connected to the outer wall of the fixing plate. A number of hole grooves are equidistantly formed in the middle of the arc-shaped plates.

[0014] Preferably, the plurality of arc-shaped plates are radially arranged on the top of the fixing plate. The concave part of the arc surface of the arc-shaped plate faces upward. The arc-shaped plate is arranged to become wider from the end close to the hemispherical top plate to the end far from the hemispherical top plate.

[0015] Preferably, the directions of the two groups of ball valves and the first springs are opposite. The ball valve on the inner wall of the second liquid adding pipe is located outside the telescopic water bag. The ball valve on the inner wall of the connecting water pipe is located inside the telescopic water bag.

[0016] Preferably, the second liquid adding pipe and the first liquid adding pipe are both vertically arranged and fixedly penetrate through the inner wall of the embedded housing.

[0017] Preferably, the cross-section of the mud suction rod is trapezoidal and the inner wall is through. The shape of the blade is an outward convex arc shape.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. Through the setting of the anti-backflow mechanism, when the push plate moves, on the one hand, it will drive the mud suction rod to swing reciprocally at the bottom of the embedded housing, sucking the mud deposited at the bottom of the reaction tank. On the other hand, the push plate will synchronously squeeze the telescopic water bag, discharging the water liquid inside it into the first liquid adding pipe and the second liquid adding pipe. Since both of them are vertically arranged, the water outlets of the two are located at the top of the reaction tank, that is, water enters from the top inside the reaction tank and mud exits from the bottom, so as to ensure that its water level does not drop and prevent the phenomenon of sewage backflow that may occur in some processes of the current sewage treatment system, thereby improving the sewage treatment effect;

[0020] 2. Through the settings of the sludge suction rod and the H-shaped plate, when the push and press plate moves telescopically, it can drive the H-shaped plate to slide reciprocally, causing the turntable to drive the sludge suction rod to swing reciprocally. Through the reciprocally swinging sludge suction rod, cooperating with the round holes to suck the slurry at the bottom of the embedded housing, the efficiency of slurry extraction can be improved. The blades arranged outside the round holes can block large-particle impurities or cut them into small pieces during the sludge suction process to prevent the round holes from being blocked, thereby improving the purity of slurry extraction, avoiding the situation of uneven slurry suction or accidentally sucking the water body without slurry above, and since the connection between the H-shaped plate and the turntable will have sliding grooves of different lengths according to the size of the reaction tank, when the H-shaped plate moves, the turntable will be delayed according to the length of the sliding groove, so that the swinging range of the sludge suction rod will also be different to adapt to the sizes of different reaction tanks;

[0021] 3. Through the setting of the sludge collection mechanism, the hemispherical top plate is used to make the falling mud blocks scatter at the first level, and the arc-shaped plate disperses the mud blocks scattered at the first level at the second level. And the impact of the falling mud blocks compresses the second spring to make the arc-shaped plate vibrate, further preventing the mud blocks from piling up, effectively dispersing the mud blocks discharged from the discharge mud pipe to prevent blockage. In addition, the arc-shaped plates are arranged in a radial pattern that becomes wider from narrow, so that most of the falling mud blocks will pass through the distribution of the arc-shaped plates, making the mud blocks not concentrate and pile up in one place in the collection box, but relatively evenly distributed in the collection box, solving the problem in the prior art that it is not conducive to the reasonable allocation of the space of the aggregate box, thus affecting its space utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment shown in the present invention;

[0023] Figure 2 It is a top-down three-dimensional sectional view shown in the present invention;

[0024] Figure 3 It is a schematic diagram of the structure at the connection of the arc-shaped plate shown in the present invention;

[0025] Figure 4 It is a three-dimensional sectional view of the embedded housing shown in the present invention;

[0026] Figure 5 Shown in the present invention Figure 4 The enlarged structural schematic diagram of the place A therein;

[0027] Figure 6 It is a partial three-dimensional sectional view of the embedded housing shown in the present invention;

[0028] Figure 7 It is a schematic diagram of the structure at the connection of the telescopic water bag shown in the present invention;

[0029] Figure 8 It is a schematic diagram of the structure at the connection of the second liquid adding pipe shown in the present invention;

[0030] Figure 9 Partial perspective sectional view of the telescopic water bag shown in the present invention;

[0031] Figure 10 Schematic structural view of the connection part of the H-shaped plate shown in the present invention.

[0032] The reference numerals in the figure are:

[0033] 1. Embedded housing; 2. Drain pipe; 3. Vent pipe; 4. Water inlet pipe;

[0034] 5. Anti-backflow mechanism; 51. Mud suction rod; 52. Servo motor; 53. Solid-liquid separator; 54. Mud discharge pipe; 55. Turntable; 56. First liquid addition pipe; 57. Hose; 58. H-shaped plate; 59. Electric push rod; 510. Telescopic water bag; 511. Round hole; 512. Blade; 513. Second liquid addition pipe; 514. U-shaped pipe; 515. Connecting water pipe; 516. Mud pump; 517. Water collection tank; 518. Ball valve; 519. First spring; 520. Push plate;

[0035] 6. Sludge collection mechanism; 61. Collection box; 62. Box cover; 63. Arc-shaped plate; 64. Hole groove; 65. Fixed plate; 66. Second spring; 67. Hemispherical top plate. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Embodiments of the present invention

[0038] Please refer to Figures 1 to 10 As shown, a small underground sewage treatment device for preventing sewage backflow includes an embedded housing 1. A pair of vent pipes 3 are fixedly communicated with the top of the embedded housing 1. A water inlet pipe 4 is fixedly communicated with one side of the top of the embedded housing 1. A drain pipe 2 is fixedly communicated with the other side of the top of the embedded housing 1. A small underground sewage treatment device for preventing sewage backflow further includes: an anti-backflow mechanism 5 and a sludge collection mechanism 6. The anti-backflow mechanism 5 is located inside the embedded housing 1, and the sludge collection mechanism 6 is located outside the embedded housing 1;

[0039] The anti-backflow mechanism 5 is used to efficiently suck the sludge at the bottom of the reaction tank and at the same time ensure that the water level in the reaction tank does not drop to prevent backflow;

[0040] The sludge collection mechanism 6 is used to collect solid sludge and automatically distribute the mud blocks;

[0041] The anti-backflow mechanism 5 includes an electric push rod 59 fixedly connected to the inner surface of the bottom of the embedded housing 1. The output end of the electric push rod 59 is fixedly connected to a push pressure plate 520. The bottom of the push pressure plate 520 is fixedly connected to an H-shaped plate 58. The bottom of the H-shaped plate 58 is slidably connected to the inner wall of the embedded housing 1. A plurality of turntables 55 are rotatably connected to both sides of the H-shaped plate 58. A sludge suction rod 51 is fixedly connected to the outer side of each of the plurality of turntables 55. A plurality of round holes 511 are formed on both outer walls of the sludge suction rod 51. Blades 512 are fixedly connected to the outer walls of the sludge suction rod 51 corresponding to the positions of the round holes 511.

[0042] The anti-backflow mechanism 5 further includes a hose 57 fixedly communicated with the top of the sludge suction rod 51. The number of hoses 57 is the same as that of the sludge suction rods 51. A plurality of hoses 57 all fixedly penetrate through the inner wall of the embedded housing 1 and are commonly fixedly connected to a U-shaped pipe 514. The outer wall of the U-shaped pipe 514 fixedly penetrates through the inner wall of the embedded housing 1. One end of the U-shaped pipe 514 far from the hose 57 is fixedly communicated with a slurry pump 516. The output end of the slurry pump 516 is fixedly communicated with a solid-liquid separator 53. A servo motor 52 is fixedly connected to one side of the solid-liquid separator 53. The other side of the solid-liquid separator 53 is fixedly communicated with a sludge discharge pipe 54. One end of the sludge discharge pipe 54 far from the solid-liquid separator 53 fixedly penetrates through the top of the embedded housing 1.

[0043] The anti-backflow mechanism 5 further includes a water collection tank 517 fixedly communicated with the bottom of the solid-liquid separator 53. The outer wall of the water collection tank 517 is fixedly connected to the inner wall of the embedded housing 1. A connecting water pipe 515 is fixedly communicated with the bottom of the water collection tank 517. A pair of telescopic water bags 510 are fixedly communicated with one side of the connecting water pipe 515 far from the water collection tank 517. A second liquid adding pipe 513 is fixedly communicated with one side of each of the pair of telescopic water bags 510. A first liquid adding pipe 56 is fixedly communicated with the other side of the telescopic water bag 510. Ball valves 518 are slidably connected to the sides of the second liquid adding pipe 513 and the connecting water pipe 515 close to the telescopic water bags 510. A first spring 519 is fixedly connected to the side of each ball valve 518 far from the telescopic water bag 510. One end of the first spring 519 far from the ball valve 518 is respectively fixedly connected to the inner walls of the second liquid adding pipe 513 and the connecting water pipe 515.

[0044] The directions of the two groups of ball valves 518 and the first springs 519 are opposite. The ball valve 518 on the inner wall of the second liquid adding pipe 513 is located outside the telescopic water bag 510, and the ball valve 518 on the inner wall of the connecting water pipe 515 is located inside the telescopic water bag 510.

[0045] Both the second liquid adding pipe 513 and the first liquid adding pipe 56 are vertically arranged and fixedly penetrate through the inner wall of the embedded housing 1.

[0046] The cross-section of the sludge suction rod 51 is trapezoidal and its inner wall is through. The shape of the blade 512 is an outwardly convex arc shape.

[0047] Wherein: a solid-liquid separation tank, an anaerobic filter bed tank, a carrier flow tank, a biological filler filter tank and a slow-release chlorine tablet disinfection tank are provided inside the embedded housing 1. A pair of telescopic water bags 510 are respectively located on both sides of the push plate 520. The bottoms of the sludge suction rods 51 are all attached to the bottom inner wall of the embedded housing 1. The connection between the H-shaped plate 58 and the turntable 55 is provided with sliding grooves of different lengths according to the size of the reaction tank. A ball valve 518 and a first spring 519 opposite to the bottom of the second liquid adding pipe 513 are arranged at the bottom of the first liquid adding pipe 56.

[0048] The effects achieved by this embodiment are as follows: In the prior art, on the one hand, pumping the sludge will cause the water level in the reaction tank to drop, resulting in sewage backflow in some processes of the sewage treatment system, which may increase the microbial load in the reaction tank. On the other hand, the current sludge suction pipe for pumping sludge is generally fixedly arranged at the bottom of the reaction tank. Therefore, it needs to be evenly distributed and arranged, which not only increases the installation difficulty and cost, but also easily leads to uneven sludge suction or the situation of mistakenly sucking the water body without sludge above. Compared with the prior art, through the implementation of this embodiment, the anti-backflow mechanism 5 is set. When the push plate 520 moves, on the one hand, it will drive the sludge suction rod 51 to swing reciprocally at the bottom of the embedded housing 1, sucking the sludge deposited at the bottom of the reaction tank. On the other hand, the push plate 520 will synchronously squeeze the telescopic water bag 510, and water enters at the top of the reaction tank, preventing the phenomenon of sewage backflow in some processes of the current sewage treatment system.

[0049] Further embodiment:

[0050] Please refer to Figures 2 to 3 As shown, the sludge collection mechanism 6 includes a collection box 61 fixedly connected to the outer wall of the embedded housing 1. A box cover 62 is clamped on the top of the collection box 61. A fixing plate 65 is fixedly connected to the top of the collection box 61. A hemispherical top plate 67 is fixedly connected to the top of the fixing plate 65. A plurality of arc-shaped plates 63 are also rotatably connected to the top of the fixing plate 65. A plurality of arc-shaped plates 63 are all located below the hemispherical top plate 67. Second springs 66 are fixedly connected to the bottoms of the arc-shaped plates 63. One ends of the plurality of second springs 66 far from the arc-shaped plates 63 are all fixedly connected to the outer wall of the fixing plate 65. A plurality of hole slots 64 are equidistantly arranged in the middle of the arc-shaped plates 63;

[0051] The plurality of arc-shaped plates 63 are radially arranged on the top of the fixing plate 65. The concave portions of the arc surfaces of the arc-shaped plates 63 face upward. The arc-shaped plates 63 are arranged from narrow to wide from the end close to the hemispherical top plate 67 to the end far from the hemispherical top plate 67;

[0052] Wherein: the hemispherical top plate 67 is used for primary dispersion of solid sludge, and the arc-shaped plates 63 are used for secondary dispersion of sludge blocks.

[0053] The effects achieved by this embodiment are as follows: In the prior art, most traditional material discharging directly imports mud blocks into the box, and the mud blocks mostly concentrate at the position of the material discharging port, which is likely to cause blockage and is not conducive to the reasonable distribution of the space of the aggregate box, thus affecting its space utilization rate. Compared with the prior art, by implementing this embodiment, the sludge collection mechanism 6 is set. With the mutual cooperation of the arc-shaped plate 63 with the arc surface depression facing upwards and the hole grooves 64, part of the falling mud blocks will fall along the inclined radian of the rotation of the arc-shaped plate 63 into the collection box 61, and the other part of the smaller mud blocks will fall into the collection box 61 along the hole grooves 64. And the impact of the falling mud blocks causes the arc-shaped plate 63 to vibrate, further preventing the accumulation of mud blocks, effectively dispersing the mud blocks discharged from the discharge mud pipe 54, effectively preventing blockage, and at the same time making the mud blocks relatively evenly distributed in the collection box 61, improving the space utilization rate.

[0054] The complete usage steps and working principle of the above embodiment are as follows:

[0055] During use, the treatment process of sewage in the pre-buried housing 1 is as follows. First, the sewage enters the solid-liquid separation tank through the water inlet pipe 4 for pretreatment. Then, through the anaerobic biofilm attached to the surface of the packing in the anaerobic circulation filter tank, after removing the dissolved organic matter in the sewage, the sewage enters the aeration tank, that is, the aerobic biological carrier flow tank, and the sewage is further treated by the biofilm on the suspended packing under the aeration condition. The treated sewage enters the biological filter for filtration and enters the disinfection tank through the metering device. After being disinfected by the slow-release chlorine tablets in the disinfection tank, the final treatment of the sewage is completed. Finally, it is discharged into the natural water body through the drain pipe 2.

[0056] Furthermore, when the sludge accumulated at the bottom of the embedded housing 1 needs to be treated, the electric push rod 59, the slurry pump 516 and the servo motor 52 can be started through an external control system. The push plate 520 is pushed by the electric push rod 59, and then the H-shaped plate 58 is driven by the push plate 520 to slide reciprocally. When the H-shaped plate 58 moves, it can drive the turntables 55 on both sides to rotate. Furthermore, the suction rod 51 is driven by the turntable 55 to rotate around the turntable 55 as the axis. Therefore, the reciprocating sliding of the H-shaped plate 58 causes the suction rod 51 to swing reciprocally at the bottom of the embedded housing 1. Since the connection between the H-shaped plate 58 and the turntable 55 is provided with chutes of different lengths according to the size of the reaction tank, the movement of the H-shaped plate 58 drives the turntable 55 to rotate with a delay according to the length of the chute, so that the swinging range of the suction rod 51 will also be different to adapt to the sizes of different reaction tanks. The soft material of the hose 57 will not hinder the rotation of the suction rod 51. Since the slurry in the U-shaped pipe 514 is pumped into the solid-liquid separator 53 when the slurry pump 516 is started, and the U-shaped pipe 514, the hose 57 and the suction rod 51 are all in a connected relationship, the slurry pump 516 can suck the slurry deposited at the bottom of the reaction tank through the round holes 511 on the suction rod 51 and then pump it into the solid-liquid separator 53. The blades 512 arranged outside the round holes 511 can block large-particle impurities or cut them into small pieces during the process of the suction rod 51 swinging to suck slurry, so as to prevent the round holes 511 from being blocked. By sucking the slurry at the bottom of the embedded housing 1 with the reciprocally swinging suction rod 51, the efficiency and purity of slurry extraction can be improved, and the situations of uneven slurry suction or accidentally sucking the water body without slurry above during fixed-point adsorption can be avoided. After the slurry is pumped into the solid-liquid separator 53, the spiral extrusion rod in the solid-liquid separator 53 is driven by the servo motor 52 to separate the solid and liquid of the slurry. The solid mud blocks are discharged from the mud outlet pipe 54 into the collection box 61, and the water is collected by the water collection tank 517 and discharged into the telescopic water bag 510 through the connecting water pipe 515. Since the ball valve 518 on the inner wall of the connecting water pipe 515 is located inside the telescopic water bag 510, a one-way valve for flowing into the telescopic water bag 510 can be formed in cooperation with the first spring 519, that is, the water inside the telescopic water bag 510 is automatically replenished by the water collection tank 517. At the same time, when the push plate 520 reciprocates, the telescopic water bag 510 will be squeezed. Since the two sets of ball valves 518 and the first springs 519 are arranged in opposite directions, and the ball valve 518 on the inner wall of the second liquid adding pipe 513 is located outside the telescopic water bag 510, and the ball valve 518 and the first spring 519 opposite to the bottom of the second liquid adding pipe 513 are arranged at the bottom of the first liquid adding pipe 56, a one-way valve for flowing into the pipe can be formed at the bottoms of the first liquid adding pipe 56 and the second liquid adding pipe 513. Therefore, when the telescopic water bag 510 is squeezed, the water liquid inside it will be discharged from the first liquid adding pipe 56 and the second liquid adding pipe 513 on both sides respectively. Since both the second liquid adding pipe 513 and the first liquid adding pipe 56 are vertically arranged, the water outlets of the two are located at the top of the reaction tank, that is, on the one hand, the sludge at the bottom of the reaction tank is pumped away, and on the other hand, relatively clean water liquid enters the top of the reaction tank.Water and slurry enter and exit the reaction tank, keeping the water level in the reaction tank from dropping, so as to avoid the phenomenon of sewage backflow where only slurry exits the reaction tank without water inlet;

[0057] Please refer to the above working process Figures 1 to 2 , Figures 4 to 10 .

[0058] Furthermore, when the solid mud block is discharged from the mud outlet pipe 54 into the collection box 61, the mud block first hits and scatters on the hemispherical top plate 67 and slides down along the arc of the hemispherical top plate 67. When the scattered mud block reaches the arc-shaped plate 63, the self-weight of the mud block causes the arc-shaped plate 63 to rotate and compress the second spring 66. Since the concave part of the arc surface of the arc-shaped plate 63 is upwardly arranged and a number of through holes 64 are equidistantly arranged in the middle, part of the mud block will fall into the collection box 61 along the inclined arc of the rotation of the arc-shaped plate 63, and the other part of the smaller mud particles will fall into the collection box 61 along the through holes 64. And the impact of the falling mud block causes the arc-shaped plate 63 to vibrate, further avoiding the accumulation of mud blocks, effectively dispersing the mud blocks discharged from the mud outlet pipe 54. Then, due to the radially arranged shape of the arc-shaped plate 63 that becomes wider from narrow, most of the falling mud blocks will pass through the distribution of the arc-shaped plate 63, so that the mud blocks will not be concentrated and piled up in one place in the collection box 61, but are relatively evenly distributed in the collection box 61. Coupled with the fact that the mud blocks are broken up by hitting the hemispherical top plate 67 and their volume is reduced, the space utilization rate of the collection box 61 is improved and the amount of stored sludge can be increased;

[0059] Please refer to the above working process Figures 2 to 3 .

[0060] The circuits and controls involved in the present invention are all prior arts and will not be elaborated here too much.

[0061] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A small underground sewage treatment device for preventing sewage backflow, comprising a pre-buried shell (1), a pair of air leakage pipes (3) fixedly connected to the top of the pre-buried shell (1), a water inlet pipe (4) fixedly connected to one side of the top of the pre-buried shell (1), and a drainage pipe (2) fixedly connected to the other side of the top of the pre-buried shell (1), characterized in that: The small underground sewage treatment equipment for preventing sewage backflow further comprises: a backflow prevention mechanism (5) and a sludge collection mechanism (6), wherein the backflow prevention mechanism (5) is located inside the pre-buried shell (1), and the sludge collection mechanism (6) is located outside the pre-buried shell (1); The anti-backflow mechanism (5) is used to efficiently absorb the sludge at the bottom of the reaction tank and at the same time ensure that the water level in the reaction tank does not drop to prevent backflow; The sludge collecting mechanism (6) is used to collect solid sludge and automatically distribute the sludge lumps.

2. A small underground sewage treatment equipment for preventing sewage backflow according to claim 1, characterized in that: The anti-backflow mechanism (5) comprises an electric push rod (59) fixedly connected to the inner surface of the bottom of the embedded shell (1); the output end of the electric push rod (59) is fixedly connected to a push plate (520); the bottom of the push plate (520) is fixedly connected to an H-shaped plate (58); the bottom of the H-shaped plate (58) is slidably connected to the inner wall of the embedded shell (1); a plurality of rotating disks (55) are rotatably connected to both sides of the H-shaped plate (58); the outer sides of the plurality of rotating disks (55) are fixedly connected to mud suction rods (51); a plurality of circular holes (511) are opened on both sides of the outer wall of the mud suction rod (51); and blades (512) are fixedly connected to the positions of the circular holes (511) on the outer wall of the mud suction rod (51).

3. A small underground sewage treatment equipment for preventing sewage backflow according to claim 1, characterized in that: The anti-backflow mechanism (5) further comprises a hose (57) fixedly connected to the top of the mud suction rod (51); the number of the hoses (57) is the same as the number of the mud suction rods (51); the plurality of hoses (57) are fixedly passed through the inner wall of the embedded shell (1) and are commonly fixedly connected to a U-shaped tube (514); the outer wall of the U-shaped tube (514) is fixedly passed through the inner wall of the embedded shell (1); the end of the U-shaped tube (514) away from the hose (57) is fixedly connected to a mud pump (516); the output end of the mud pump (516) is fixedly connected to a solid-liquid separator (53); one side of the solid-liquid separator (53) is fixedly connected to a servo motor (52); the other side of the solid-liquid separator (53) is fixedly connected to a mud outlet pipe (54); the end of the mud outlet pipe (54) away from the solid-liquid separator (53) is fixedly passed through the top of the embedded shell (1).

4. A small underground sewage treatment equipment for preventing sewage backflow according to claim 1, characterized in that: The anti-backflow mechanism (5) further comprises a water collecting box (517) fixedly connected to the bottom of the solid-liquid separator (53); the outer wall of the water collecting box (517) is fixedly connected to the inner wall of the embedded shell (1); the bottom of the water collecting box (517) is fixedly connected to a connecting water pipe (515); the side of the connecting water pipe (515) away from the water collecting box (517) is fixedly connected to a pair of telescopic water bags (510); one side of the pair of telescopic water bags (510) is fixedly connected to a second liquid adding pipe (513); The other side of the telescopic water bag (510) is fixedly connected to the first liquid adding pipe (56), the second liquid adding pipe (513) and the side of the connecting water pipe (515) close to the telescopic water bag (510) are slidably connected to the ball valve (518), the side of the ball valve (518) away from the telescopic water bag (510) is fixedly connected to the first spring (519), and one end of the first spring (519) away from the ball valve (518) is fixedly connected to the inner wall of the second liquid adding pipe (513) and the connecting water pipe (515), respectively.

5. The small underground sewage treatment equipment for preventing sewage backflow according to claim 1 is characterized in that: The sludge collection mechanism (6) comprises a collection box (61) fixedly connected to the outer wall of the embedded shell (1); a box cover (62) is clamped on the top of the collection box (61); a fixing plate (65) is fixedly connected to the top of the collection box (61); a hemispherical top plate (67) is fixedly connected to the top of the fixing plate (65); a plurality of arc plates (63) are rotatably connected to the top of the fixing plate (65); the plurality of arc plates (63) are all located below the hemispherical top plate (67); the bottom of the arc plates (63) are all fixedly connected to second springs (66); one end of the plurality of second springs (66) away from the arc plates (63) is fixedly connected to the outer wall of the fixing plate (65); and a plurality of holes (64) are equidistantly provided in the middle of the arc plates (63).

6. A small underground sewage treatment equipment for preventing sewage backflow according to claim 5, characterized in that: A plurality of the arc-shaped plates (63) are radially arranged on the top of the fixed plate (65), the arc-shaped plates (63) are arranged with the concave parts of the arc surfaces facing upward, and the arc-shaped plates (63) are arranged to be narrower and wider from one end close to the hemispherical top plate (67) to one end away from the hemispherical top plate (67).

7. A small underground sewage treatment equipment for preventing sewage backflow according to claim 4, characterized in that: The two groups of ball valves (518) and the first spring (519) are in opposite directions; the ball valve (518) on the inner wall of the second liquid adding pipe (513) is located outside the telescopic water bag (510), and the ball valve (518) on the inner wall of the connecting water pipe (515) is located inside the telescopic water bag (510).

8. The small underground sewage treatment equipment for preventing sewage backflow according to claim 4 is characterized in that: The second liquid adding pipe (513) and the first liquid adding pipe (56) are both arranged vertically and fixedly penetrate the inner wall of the embedded shell (1).

9. The small underground sewage treatment equipment for preventing sewage backflow according to claim 2 is characterized in that: The cross section of the mud suction rod (51) is trapezoidal and the inner wall is through-set, and the shape of the blade (512) is an outward convex arc shape.

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