Thermal power plant wastewater pretreatment apparatus

Abstract

The present invention relates to the technical field of wastewater treatment, and disclosed is a thermal power plant wastewater pretreatment apparatus, comprising: a waste discharge unit which comprises a waste discharge pipe, a fixed sleeve provided inside the waste discharge pipe, a movable tube sleeve provided outside the fixed sleeve, a piston rod provided at the end of the movable tube sleeve, an elastic member provided at and abutting against the bottom of the piston rod, an adjustment member passing through the bottom of the waste discharge pipe, and a pressure-actuated member provided on the sidewall of the waste discharge pipe. The beneficial effects of the present invention are that: filtration efficiency can be significantly improved, and by reducing the accumulation of impurities inside a filter, faster wastewater treatment is ensured, reducing treatment time; additionally, maintenance and cleaning of a filter screen are simpler and more convenient, saving labor and time costs; and in addition, reduction of the accumulation of impurities also decreases wear on the filter screen and related components, thereby prolonging the service life of a device, and further reducing maintenance and replacement costs.

Description

A wastewater pretreatment device for thermal power plants Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a wastewater pretreatment device for thermal power plants. Background Technology

[0002] Wastewater from thermal power plants mainly originates from cooling water, boiler blowdown, limestone slurry wastewater, and byproducts from wastewater treatment. Cooling water may be contaminated and discharged during recycling. Boilers periodically discharge wastewater containing high concentrations of dissolved solids and heavy metals during steam power generation. Limestone slurry is used for flue gas desulfurization, and the resulting wastewater contains suspended solids and chemical oxygen demand (COD). In addition, sludge and byproducts generated during wastewater treatment also lead to wastewater discharge.

[0003] Wastewater must be treated before discharge to ensure it meets emission standards. However, during the treatment process, a large number of impurities in the wastewater often accumulate inside the filtration device, causing filter clogging. This not only reduces filtration efficiency but also makes cleaning the inside of the filter more difficult. Summary of the Invention

[0004] In view of the problems existing in the above or prior art, the present invention is proposed. Therefore, the object of the present invention is to provide a pretreatment device for wastewater from thermal power plants, which solves the problem of inconvenient cleaning of internal impurities in existing wastewater treatment devices.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a wastewater pretreatment device for thermal power plants, comprising a sewage discharge unit, including a sewage discharge pipe, a fixed sleeve disposed inside the sewage discharge pipe, a movable sleeve disposed outside the fixed sleeve, a piston rod disposed at the end of the movable sleeve, an elastic member disposed at the bottom of the piston rod and in contact with the piston rod, an adjusting member passing through the bottom of the sewage discharge pipe, and a pressing member disposed on the side wall of the sewage discharge pipe;

[0006] The fixed sleeve includes a first through hole formed in the side wall of the fixed sleeve, and the movable sleeve includes a second through hole formed in the side wall of the movable sleeve;

[0007] The piston rod, when pressed, can drive the fixed sleeve to rotate, thereby making the first through hole coincide with the second through hole.

[0008] As a preferred embodiment of the wastewater pretreatment device for thermal power plants according to the present invention, the sewage discharge pipe includes a debris removal port that penetrates the side wall of the sewage discharge pipe;

[0009] The first through hole coincides with the axis of the impurity removal port.

[0010] The movable sleeve is located inside the sewage pipe.

[0011] As a preferred embodiment of the wastewater pretreatment device for thermal power plants according to the present invention, the movable sleeve and the fixed sleeve are movably connected;

[0012] The outer wall of the movable sleeve is provided with an extension plate, and the extension plate is embedded in the inner wall of the sewage pipe and can rotate.

[0013] As a preferred embodiment of the wastewater pretreatment device for thermal power plants according to the present invention, the movable sleeve includes a connecting sleeve rod disposed at the end of the movable sleeve, and the inner wall of the connecting sleeve rod is provided with an arc-shaped groove.

[0014] The piston rod includes a sealing part and a guide post disposed on the side wall of the piston rod;

[0015] The guide post is adapted to the arc-shaped groove.

[0016] As a preferred embodiment of the wastewater pretreatment device for thermal power plants according to the present invention, the sewage discharge pipe includes a guide sleeve disposed inside the sewage discharge pipe, and the guide sleeve has a waist hole inside;

[0017] The connecting sleeve rod is disposed inside the guide sleeve; the piston rod passes through the guide sleeve and extends to the outside of the guide sleeve;

[0018] The guide post is adapted to the guide sleeve;

[0019] The vertical movement of the piston rod can drive the movable sleeve to rotate.

[0020] In a preferred embodiment of the wastewater pretreatment device for thermal power plants according to the present invention, the regulating member passes through the sewage pipe and extends into the interior of the regulating member;

[0021] The end of the adjusting member is connected to the elastic member; the movement of the adjusting member can compress the elastic member.

[0022] In a preferred embodiment of the wastewater pretreatment device for thermal power plants according to the present invention, the pressure element includes a pressure switch and a pressure rod disposed at the end of the pressure switch;

[0023] The pressure bar includes a head and a rod portion, and a neck for connecting the head and the rod portion;

[0024] The head extends into the interior of the sewage pipe.

[0025] As a preferred embodiment of the wastewater pretreatment device for thermal power plants according to the present invention, the movable sleeve includes a groove disposed on the outside of the movable sleeve, the groove includes a reset surface disposed at the end of the groove, and a slot through the groove.

[0026] The head penetrates the groove and extends into the interior of the groove;

[0027] The reset surface abuts against the head and can push the rod to contact the pressure switch contact.

[0028] As a preferred embodiment of the wastewater pretreatment device for thermal power plants according to the present invention, the filtration unit includes a tank, a filter screen disposed inside the tank, and a scraper disposed in the center of the tank.

[0029] The tank includes a water inlet located on the top of the tank, a water filter located on the bottom of the tank, and a drain outlet located at the bottom of the tank.

[0030] The filter screen is disposed between the water inlet and the water outlet.

[0031] In a preferred embodiment of the wastewater pretreatment device for thermal power plants according to the present invention, the sewage outlet is connected to the sewage pipe;

[0032] A motor that drives the scraper to rotate is installed on the top of the tank.

[0033] The motor is electrically connected to the pressure contact element, and the scraper bar abuts against the inner wall of the filter screen.

[0034] The beneficial effects of this invention are as follows: This invention can significantly improve filtration efficiency by reducing the accumulation of impurities inside the filter, ensuring faster wastewater treatment and reducing treatment time; at the same time, it makes the maintenance and cleaning of the filter screen simpler, saving manpower and time costs; in addition, the reduction of impurity accumulation will also reduce the wear of the filter screen and related components, thereby extending the service life of the equipment and reducing maintenance and replacement costs. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 is a schematic diagram of the sewage discharge unit structure of the wastewater pretreatment device in a thermal power plant.

[0037] Figure 2 is a half-sectional view of the wastewater discharge unit of the wastewater pretreatment device in a thermal power plant.

[0038] Figure 3 is a partial enlarged view of section A in Figure 2 of the wastewater pretreatment device for thermal power plants.

[0039] Figure 4 is a partial cross-sectional view of the sewage discharge pipeline of the wastewater pretreatment device in a thermal power plant.

[0040] Figure 5 is a schematic diagram of the exploded structure of the sewage discharge unit of the wastewater pretreatment device in a thermal power plant.

[0041] Figure 6 is an enlarged view of section B of the wastewater pretreatment device in Figure 5.

[0042] Figure 7 is a three-dimensional structural diagram of a wastewater pretreatment device for thermal power plants.

[0043] Figure 8 is a partial cross-sectional view of a wastewater pretreatment device for a thermal power plant.

[0044] In the diagram: 100, Sewage discharge unit; 101, Sewage discharge pipe; 1011, Impurity removal port; 1012, Guide sleeve; 10121, Waist hole; 102, Fixed sleeve; 1021, First through hole; 103, Movable sleeve; 1031, Second through hole; 1032, Extension plate; 1033, Connecting sleeve rod; 10331, Arc groove; 1034, Slide groove; 10341, Reset surface; 10342, Groove opening; 104, Piston rod ; 1041, Sealing part; 1042, Guide post; 105, Elastic element; 106, Adjusting element; 107, Contact element; 1071, Contact switch; 1072, Pressure rod; 10721, Head; 10722, Neck; 10723, Rod; 200, Filter unit; 201, Tank body; 2011, Inlet; 2012, Filter outlet; 2013, Drain outlet; 202, Filter screen; 203, Scraper rod; M, Motor. Detailed Implementation

[0045] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0046] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0047] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0048] Example 1

[0049] Referring to Figures 1 to 4, the first embodiment of the present invention provides a wastewater pretreatment device for a thermal power plant, comprising a sewage discharge unit 100, including a sewage discharge pipe 101, a fixed sleeve 102 disposed inside the sewage discharge pipe 101, a movable sleeve 103 disposed outside the fixed sleeve 102, a piston rod 104 disposed at the end of the movable sleeve 103, an elastic member 105 disposed at the bottom of the piston rod 104 and in contact with the piston rod 104, an adjusting member 106 passing through the bottom of the sewage discharge pipe 101, and a pressing member 107 disposed on the side wall of the sewage discharge pipe 101; the fixed sleeve 102 includes a first through hole 1021 opened in the side wall of the fixed sleeve 102, and the movable sleeve 103 includes a second through hole 1031 opened in the side wall of the movable sleeve 103; the piston rod 104, when pressed, can drive the fixed sleeve 102 to rotate, thereby realizing the overlap of the first through hole 1021 and the second through hole 1031.

[0050] In this embodiment, the sewage pipe 101 adopts a three-way pipe structure and is hollow inside; the top of the fixed sleeve 102 is a conical structure with a large opening to ensure that more water can enter the interior of the fixed sleeve 102; the bottom of the fixed sleeve 102 is a vertical cylindrical structure, and the fixed sleeve 102 is adapted to the movable sleeve 103; the movable sleeve 103 is sleeved on the outside of the first through hole 1021, and the movable sleeve 103 is located outside the fixed sleeve 102 and can rotate, and the fixed sleeve 102 and the movable sleeve 103 form a closed space.

[0051] Specifically, the positions of the first through hole 1021 and the second through hole 1031 are corresponding. Under normal conditions, the positions of the second through hole 1031 and the first through hole 1021 are offset, and the first through hole 1021 is in a blocked state. When the movable sleeve 103 is rotated to connect the first through hole 1021 and the second through hole 1031, the impurities located inside the first through hole 1021 can be discharged into the fixed sleeve 102 along with the fluid.

[0052] It should be noted that the piston rod 104 is located inside the fixed sleeve 102, and the end of the piston rod 104 is in close contact with the inner wall of the fixed sleeve 102. When the piston rod 104 is pressed and moves along the axis of the fixed sleeve 102, it can drive the movable sleeve 103 to rotate, thereby achieving the sealing and opening of the first through hole 1021.

[0053] Preferably, the elastic element 105 is located at the bottom of the piston rod 104, and the end of the elastic element 105 abuts against the piston rod 104. Under normal conditions, when the fluid pressure is normal, the elastic element 105 pushes the piston rod 104 to move through its elastic force, thereby positioning the piston rod 104 in a suitable position inside the fixed sleeve 102. In this state, the first through hole 1021 is closed. When the fluid pressure is greater than the rebound force of the elastic element 105, the piston rod 104 is pressed and moves towards the elastic element 105, and the elastic element 105 will be gradually compressed.

[0054] Specifically, the adjusting member 106 is located at the bottom of the sewage pipe 101 and can be extended and retracted. The adjusting member 106 abuts against the other end of the elastic member 105. When the adjusting member 106 compresses the elastic member 105 to a certain extent, the elastic member 105 is already under force. At this time, if the elastic member 105 is compressed again, the required pressure will increase, thereby changing the fluid pressure required to push the piston rod 104 to move, and thus realizing the threshold for regulating the fluid pressure of the device.

[0055] During use, when the filter screen inside the tank is covered with a lot of impurities, its water filtration performance is reduced. However, as sewage continues to enter, the liquid pressure inside the tank increases. When the liquid pressure is greater than the rebound force of the elastic element 105, the piston rod 104 is pressed and moves along the axis of the fixed sleeve 102. During the movement of the piston rod 104, it drives the movable sleeve 103 to rotate, so that the second through hole 1031 corresponds to the position of the first through hole 1021, thus making the first through hole 1021 unobstructed. At this time, the pressurized sewage carries the impurities located at the bottom of the tank and discharges them into the sewage pipe 101, thereby effectively cleaning the impurities inside the tank.

[0056] Example 2

[0057] Referring to Figures 1 to 6, this is the second embodiment of the present invention, which differs from the first embodiment in that: the sewage pipe 101 includes a cleaning port 1011 penetrating its side wall; the first through hole 1021 coincides with the axis of the cleaning port 1011, and the movable sleeve 103 is located inside the sewage pipe 101.

[0058] In this embodiment, the impurity removal port 1011 is located on the side wall of the sewage pipe 101 and is connected to the sewage pipe 101; the fixed sleeve 102 is relatively fixed in position to the sewage pipe 101, the axis of the first through hole 1021 coincides with the axis of the impurity removal port 1011, and the opening direction of the first through hole 1021 is located on the side close to the impurity removal port 1011; and the movable sleeve 103 is located inside the sewage pipe 101.

[0059] Furthermore, the movable sleeve 103 is movably connected to the fixed sleeve 102; the outer wall of the movable sleeve 103 is provided with an extension plate 1032, and the extension plate 1032 is embedded into the inner wall of the sewage pipe 101 and can rotate.

[0060] In this embodiment, the movable sleeve 103 is fitted on the outside of the fixed sleeve 102, and the movable sleeve 103 is rotatable; an annular groove adapted to the extension plate 1032 is opened at the lower position of the impurity removal port 1011, and the extension plate 1032 is embedded in the inner wall of the sewage pipe 101. The extension plate 1032 is located inside the sewage pipe 101 and can rotate; thereby ensuring that sewage will not fall to the bottom of the sewage pipe 101 during the discharge process; and to a certain extent, it can better facilitate the cleaning of impurities.

[0061] Furthermore, the movable sleeve 103 includes a connecting sleeve rod 1033 disposed at the end of the movable sleeve 103, and the inner wall of the connecting sleeve rod 1033 is provided with an arc-shaped groove 10331; the piston rod 104 includes a sealing part 1041 and a guide post 1042 disposed on the side wall of the piston rod 104; the guide post 1042 is adapted to the arc-shaped groove 10331.

[0062] In this embodiment, the outer side of the sealing part 1041 is made of rubber, and the outer wall of the sealing part 1041 is in close contact with the inner wall of the fixing sleeve 102; the sealing part 1041 is located inside the fixing sleeve 102, the top of the sealing part 1041 does not exceed the bottom arc of the first through hole 1021, and the bottom of the sealing part 1041 does not exceed the bottom of the fixing sleeve 102.

[0063] It should be noted that the connecting sleeve 1033 is located at the bottom of the movable sleeve 103, and the side wall of the connecting sleeve 1033 is provided with an arc-shaped groove. The guide post 1042 is adapted to the arc-shaped groove 10331, so that the movement of the piston rod 104 can drive the movable sleeve 103 to rotate.

[0064] Furthermore, the sewage pipe 101 includes a guide sleeve 1012 disposed inside the sewage pipe 101, and a waist hole 10121 is provided inside the guide sleeve 1012; a connecting sleeve rod 1033 is disposed inside the guide sleeve 1012; a piston rod 104 passes through the guide sleeve 1012 and extends to the outside of the guide sleeve 1012; a guide post 1042 is adapted to the guide sleeve 1012; the piston rod 104 can drive the movable sleeve 103 to rotate when it moves in the vertical direction.

[0065] It should be noted that the connecting sleeve 1033 passes through the guide sleeve 1012 and extends to the outside of the guide sleeve 1012, and the piston rod 104 passes through the connecting sleeve 1033 and extends to the outside of the connecting sleeve 1033; the inner wall of the guide sleeve 1012 is provided with a waist hole 10121 arranged in the vertical direction; the guide post 1042 passes through the arc groove 10331 and extends into the waist hole 10121. Through the limitation of the waist hole 10121, the piston rod 104 can only move back and forth along the axial direction of the guide sleeve 1012. During the movement of the piston rod 104, the outer wall of the guide post 1042 presses against the inner wall of the arc groove 10331, which can drive the movable sleeve 103 to rotate at a certain angle.

[0066] Furthermore, the adjusting member 106 passes through the sewage pipe 101 and extends into the interior of the sewage pipe 101; the end of the adjusting member 106 is connected to the elastic member 105; the movement of the adjusting member 106 can compress the elastic member 105.

[0067] It should be noted that the adjusting member 106 adopts a screw structure. Through the cooperation between the adjusting member 106 and the threaded structure at the bottom of the sewage pipe 101, the adjusting member 106 can be rotated and screwed in simultaneously, thereby compressing the elastic member 105 at the end of the adjusting member 106. The elastic member 105 is preferably a spring, and the two ends of the elastic member 105 abut against the bottom of the piston rod 104 and the top of the adjusting member 106, respectively.

[0068] Specifically, by rotating the adjusting component 106 to compress the elastic component 105, the amount of compression of the elastic component 105 can be controlled to change the pressure value required for the liquid to push the piston rod 104 to move, thereby making it easier for the operator to operate.

[0069] Furthermore, the pressure member 107 includes a pressure switch 1071 and a pressure rod 1072 disposed at the end of the pressure switch 1071; the pressure rod 1072 includes a head 10721 and a rod portion 10723, and a neck 10722 for connecting the head 10721 and the rod portion 10723; the head 10721 extends into the interior of the sewage pipe 101.

[0070] In this embodiment, the pressure switch 1071 is a common pressure switch. When the contacts of the pressure switch 1071 feel pressure for a long time, the corresponding drive device can be activated. The pressure switch 1071 is installed on the outer wall of the sewage pipe 101.

[0071] It should be noted that the lever 1072 is located on one side of the pressure switch 1071, and the lever 1072 is movable; the head 10721 has an arc-shaped structure, and the neck 10722 has a cylindrical structure with a small radius, and the neck 10722 connects the head 10721 and the lever 10723; the end of the head 10721 is located inside the sewage pipe 101.

[0072] Furthermore, the movable sleeve 103 includes a slide groove 1034 disposed on the outside of the movable sleeve 103. The slide groove 1034 includes a reset surface 10341 disposed at the end of the slide groove 1034 and a slot 10342 penetrating the slide groove 1034. The head 10721 penetrates the slide groove 1034 and extends into the interior of the slide groove 1034. The reset surface 10341 abuts against the head 10721, which can push the rod portion 10723 to contact the contact of the pressure switch 1071.

[0073] In this embodiment, the slide groove 1034 is provided on the outer wall of the movable sleeve 103, and the position of the slide groove 1034 corresponds to the position of the pressure rod 1072; a reset surface 10341 is provided at one end of the slide groove 1034, and a slot 10342 is opened on one side of the reset surface 10341; the size of the slot 10342 is adapted to the head 10721, so that the head 10721 can slide out from inside the slide groove 1034.

[0074] It should be noted that when the movable sleeve 103 drives the second through hole 1031 to rotate towards the first through hole 1021, one end of the slide groove 1034 has a convex structure, so that the head 10721 can be located inside the slide groove 1034, while the neck 10722 penetrates the side wall of the slide groove 1034 and extends outward; in this state, it will not push the pressure rod 1072 to move to contact the contact of the touch switch 1071.

[0075] Specifically, during the rotation of the movable sleeve 103, as the second through hole 1031 and the first through hole 1021 gradually coincide, and as the movable sleeve 103 rotates and the slot 10342 coincides with the head 10721, continuing to rotate the movable sleeve 103 allows the head 10721 to slide out from inside the slot 10342, thereby separating the head 10721 from the slide groove 1304.

[0076] Preferably, when the second through hole 1031 and the first through hole 1021 are completely overlapped, the reset surface 10341 is located on one side of the head 10721. At this time, the movable sleeve 103 is rotated in the opposite direction, so that the reset surface 10341 abuts against the head 10721. As the angle of rotation of the movable sleeve 103 gradually increases, the reset surface 10341 gradually squeezes the head 10721 and pushes the pressure rod 1072 toward the contact of the touch switch 1071. When the movable sleeve 103 is rotated to the point where the surface of the slide groove 1034 abuts against the head 10721, the pressure rod 1072 is squeezed by the slide groove 1034, so that the pressure rod 1072 abuts against the contact of the touch switch 1071.

[0077] In summary, this invention can significantly improve filtration efficiency by reducing the accumulation of impurities inside the filter, ensuring faster wastewater treatment and reducing processing time. At the same time, it makes the maintenance and cleaning of the filter screen simpler, saving manpower and time costs. By controlling the discharge of impurities, a control switch can be triggered to start the motor and drive the scraper to clean the surface of the filter screen.

[0078] Example 3

[0079] Referring to Figures 1 and 2, and Figures 7 and 8, this is the third embodiment of the present invention, which differs from the previous two embodiments in that it further includes a filter unit 200, comprising a tank 201, a filter screen 202 disposed inside the tank 201, and a scraper 203 disposed in the center of the tank 201; the tank 201 includes a water inlet 2011 disposed above the tank 201, a water filter outlet 2012 disposed below the tank 201, and a drain outlet 2013 disposed at the bottom of the tank 201; the filter screen 202 is disposed between the water inlet 2011 and the water filter outlet 2012.

[0080] In this embodiment, the filter screen 202 is located inside the tank 201 and between the inlet 2011 and the filter outlet 2012. This ensures that the wastewater enters the tank 201 from the inlet and is filtered by the filter screen 202. The pre-treated water is then discharged through the filter outlet 2012 to facilitate further treatment of the wastewater.

[0081] Specifically, the bottom of the tank 201 has a conical structure, which allows impurities located inside the tank 201 to be deposited at the bottom of the tank 201 and to flow into the drain unit 100 through the drain port 2013 provided at the bottom of the tank 201, and then the impurities can be discharged through the drain unit 100.

[0082] Furthermore, the drain outlet 2013 is connected to the drain pipe 101; a motor M is installed on the top of the tank 201 to drive the scraper 203 to rotate; the motor M is electrically connected to the contact element 107, and the scraper 203 abuts against the inner wall of the filter screen 202.

[0083] It should be noted that the drain outlet 2013 is connected to the drain pipe 101, allowing the sewage inside the tank 201 to be discharged into the drain pipe 101 through the drain outlet 2013. The motor M is located at the top of the tank 201 and is connected to the pressure switch 1071. When the contacts of the pressure switch 1071 are pressed, the motor M starts and can drive the scraper 203 to rotate.

[0084] Specifically, the scraper 203 abuts against the inner wall of the filter screen 202. During rotation, the scraper 203 can clean the impurities remaining on the inner wall of the filter screen 202, thereby maintaining the filter screen 202's good water filtration performance and enabling efficient wastewater filtration.

[0085] During use, when the filter pores of filter screen 202 are affected by impurities, the water filtration performance of filter screen 202 decreases; then, the amount of sewage entering tank 201 through inlet 2011 does not decrease, thus increasing the internal pressure of tank 201; when the internal pressure of tank 201 increases to a certain value, the fluid pressure pushes piston rod 104 to move closer to elastic element 105 and compresses elastic element 105. During the movement of piston rod 104, it drives movable sleeve 103 to rotate, so that the second through hole 1031 and the first through hole 1021 completely overlap; then the pressurized sewage carries the impurities deposited at the bottom of tank 201 out of tank 201 through impurity removal port 1011; during the impurity removal process, the internal pressure of tank 201 gradually returns to normal, at which time elastic element 105 releases its elasticity. Potential energy drives the piston rod 104 to move in the opposite direction. The movement of the piston rod 104 drives the movable sleeve 103 to rotate, causing the second through hole 1031 to be misaligned with the first through hole 1021. During the rotation, the reset surface 10341 abuts against the pressure rod 1072, and the pressure rod 1072 is pressed and contacts the contact of the touch switch 1071. The touch switch 1071 controls the motor M to start, thereby causing the scraper 203 to clean the inner wall of the filter screen 202, ensuring good water filtration performance of the filter screen 202. After the filter screen 202 is cleaned, the sewage is filtered and discharged through the filter outlet 2012. When the piston rod 104 moves to the appropriate position, the pressure rod 1072 is misaligned with the slide groove 1034, and the pressure rod 1072 no longer presses the contact of the touch switch 1071, and the motor M stops working.

[0086] In summary, this invention can significantly improve filtration efficiency by reducing the accumulation of impurities inside the filter, ensuring faster wastewater treatment and reducing processing time. At the same time, it makes the maintenance and cleaning of the filter screen simpler, saving manpower and time costs. In addition, the reduction of impurity accumulation will also reduce the wear and tear on the filter screen and related components, thereby extending the service life of the equipment and reducing maintenance and replacement costs.

[0087] Importantly, the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A device for pre-treatment of waste water from a thermal power plant, characterized in that: include, The sewage discharge unit (100) includes a sewage discharge pipe (101), a fixed sleeve (102) disposed inside the sewage discharge pipe (101), a movable sleeve (103) disposed outside the fixed sleeve (102), a piston rod (104) disposed at the end of the movable sleeve (103), an elastic member (105) disposed at the bottom of the piston rod (104) and in contact with the piston rod (104), an adjusting member (106) passing through the bottom of the sewage discharge pipe (101), and a pressing member (107) disposed on the side wall of the sewage discharge pipe (101). The fixed sleeve (102) includes a first through hole (1021) opened in the side wall of the fixed sleeve (102), and the movable sleeve (103) includes a second through hole (1031) opened in the side wall of the movable sleeve (103); The piston rod (104) can be driven to rotate the fixed sleeve (102) when it is pressed, thereby making the first through hole (1021) and the second through hole (1031) coincide.

2. The wastewater pretreatment device for thermal power plants as described in claim 1, characterized in that: The sewage pipe (101) includes a debris removal port (1011) that penetrates the side wall of the sewage pipe (101); The axis of the first through hole (1021) coincides with that of the impurity removal port (1011). The movable sleeve (103) is located inside the sewage pipe (101).

3. The wastewater pretreatment device for thermal power plants as described in claim 1 or 2, characterized in that: The movable sleeve (103) is movably connected to the fixed sleeve (102); The outer wall of the movable sleeve (103) is provided with an extension plate (1032), and the extension plate (1032) is embedded in the inner wall of the sewage pipe (101) and can rotate.

4. The wastewater pretreatment device for thermal power plants as described in claim 3, characterized in that: The movable sleeve (103) includes a connecting sleeve rod (1033) disposed at the end of the movable sleeve (103), and the inner wall of the connecting sleeve rod (1033) is provided with an arc groove (10331); The piston rod (104) includes a sealing part (1041) and a guide post (1042) disposed on the side wall of the piston rod (104); The guide post (1042) is adapted to the arc-shaped groove (10331).

5. The wastewater pretreatment device for thermal power plants as described in claim 4, characterized in that: The sewage pipe (101) includes a guide sleeve (1012) disposed inside the sewage pipe (101), and the guide sleeve (1012) has a waist hole (10121) inside; The connecting sleeve rod (1033) is disposed inside the guide sleeve (1012); the piston rod (104) passes through the guide sleeve (1012) and extends to the outside of the guide sleeve (1012); The guide post (1042) is adapted to the guide sleeve (1012); The piston rod (104) can rotate the movable sleeve (103) by moving in the vertical direction.

6. The wastewater pretreatment device for thermal power plants as described in any one of claims 1, 2, 4, or 5, characterized in that: The adjusting member (106) passes through the sewage pipe (101) and extends into the interior of the sewage pipe (101); The end of the adjusting member (106) is connected to the elastic member (105); the movement of the adjusting member (106) can compress the elastic member (105).

7. The wastewater pretreatment device for thermal power plants as described in claim 6, characterized in that: The pressure-sensitive component (107) includes a pressure switch (1071) and a pressure rod (1072) disposed at the end of the pressure switch (1071); The pressure bar (1072) includes a head (10721) and a rod (10723), and a neck (10722) for connecting the head (10721) and the rod (10723); The head (10721) extends into the interior of the sewage pipe (101).

8. The wastewater pretreatment device for thermal power plants as described in claim 7, characterized in that: The movable sleeve (103) includes a sliding groove (1034) disposed on the outside of the movable sleeve (103), the sliding groove (1034) includes a reset surface (10341) disposed at the end of the sliding groove (1034), and a slot (10342) penetrating the sliding groove (1034). The head (10721) penetrates the groove (1034) and extends into the interior of the groove (1034); The reset surface (10341) abuts against the head (10721) and can push the rod (10723) into contact with the contact of the pressure switch (1071).

9. The apparatus for the pre-treatment of waste water from a thermal power plant according to any of claims 1, 2, 4, 5, 7 or 8, characterized in that: It also includes, The filtration unit (200) includes a tank (201), a filter screen (202) disposed inside the tank (201), and a scraper (203) disposed in the center of the tank (201); The tank (201) includes a water inlet (2011) disposed above the tank (201), a water filter (2012) disposed below the tank (201), and a sewage outlet (2013) disposed at the bottom of the tank (201); The filter screen (202) is disposed between the water inlet (2011) and the water outlet (2012).

10. The wastewater pretreatment device for thermal power plants as described in claim 9, characterized in that: The sewage outlet (2013) is connected to the sewage pipe (101); The top of the tank (201) is equipped with a motor (M) that drives the scraper (203) to rotate; The motor (M) is electrically connected to the pressing member (107), and the scraper (203) abuts against the inner wall of the filter screen (202).

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