Backwashing device of sewage and wastewater flash evaporation demister, flash evaporation sewage and wastewater treatment device and multi-effect flash evaporation sewage and wastewater treatment device

Abstract

The invention discloses a backwashing device of a sewage and wastewater flash evaporation demister, a flash evaporation sewage and wastewater treatment device and a multi-effect flash evaporation sewage and wastewater treatment device, and belongs to the technical field of sewage and wastewater treatment. Therefore, the cleaning area of the demister is increased, the demisting efficiency is improved, no new power component is added, the equipment investment is reduced, the maintenance period is shortened, and the maintenance cost is reduced. During backwashing, the rotating shell rotates to be matched with the telescopic cleaning main pipe to comprehensively clean the demister, so that the number of the cleaning main pipes and the number of the cleaning branch pipes can be greatly reduced, the number of the cleaning branch pipes is determined by reciprocating motion, the number of the cleaning main pipes is reduced by rotation, and the cleaning efficiency is improved. And on the premise that the cleaning efficiency of the demister is improved, the internal dead steam resistance is reduced, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage and wastewater treatment, in particular to a backwashing device for a flash evaporation demister of sewage and wastewater, a flash evaporation sewage and wastewater treatment device, and a multi-effect flash evaporation sewage and wastewater treatment device. Background Art

[0002] In a flash evaporation device widely used in fields such as chemical engineering and environmental protection, the demister is a key component, and its efficient operation is directly related to the separation efficiency and energy consumption index of the device. The backwashing system is the core maintenance component to ensure the normal operation of the demister. Currently, existing flash evaporation devices usually are provided with a backwashing system for cleaning the demister.

[0003] There are many design defects in the existing backwashing system: Firstly, in terms of the layout of the washing pipes, if the washing pipes are not reasonably arranged, it will seriously affect the fluidity of the steam and exhaust steam in the flash evaporation device. Some devices adopt a random or dense layout of the washing pipes. Although the cleaning coverage area can be increased, the steam flow resistance is significantly increased, reducing the exhaust efficiency of the exhaust steam, and thus affecting the continuity and stability of the flash evaporation process; Secondly, the number of washing pipes is set without scientific consideration. When too many are set, not only does it occupy the limited space in the flash evaporation device, but also the washing water flow is unevenly distributed, resulting in a reduced cleaning effect on the surface of the demister and it is difficult to achieve an ideal cleaning effect; Thirdly, the inside of the flash evaporation device is in a vacuum negative pressure state. Traditional backwashing systems mostly rely on driving components such as motors to achieve the directional flow and pressure supply of the washing water. However, in a negative pressure environment, the sealing requirements of driving components such as motors are extremely high. Once the seal fails, outside air is very likely to enter the device, interfering with the negative pressure balance and even possibly causing safety hazards. At the same time, the installation and maintenance of the motor also increase the complexity and operating cost of the system.

[0004] In summary, there are technical bottlenecks in the existing backwashing system of the flash evaporation device in terms of balancing the cleaning effect of the demister and ensuring the fluidity of the steam and exhaust steam, and it is difficult to adapt to the special working conditions of the vacuum negative pressure inside the device. There is an urgent need for an optimized design scheme for the backwashing system to solve the above technical problems. Summary of the Invention

[0005] Object of the Invention: To provide a backwashing device for a flash evaporation demister of sewage and wastewater, a flash evaporation sewage and wastewater treatment device, and a multi-effect flash evaporation sewage and wastewater treatment device to solve the above problems existing in the prior art.

[0006] Technical solution: A backwashing device for a flash evaporation demister of sewage and wastewater. The backwashing device is connected to the blades in the slurry inlet pipe through a speed reducer. The backwashing device includes: a fixed base, on which a rotating shell is arranged. At least one telescopic flushing pipeline is arranged on the rotating shell. A water inlet pipe and a driving pipe are coaxially arranged on the rotating shell. The outlet of the water inlet pipe is placed inside the driving pipe. A water outlet tray is arranged on the driving pipe. Two sealing discs that are stationary relative to the rotating shell are sleeved on the driving pipe. The two sealing discs are located on both sides of the water outlet tray and form a driving cavity. A first through hole for connecting the telescopic flushing pipeline and the driving cavity is arranged on the rotating shell. An eccentric wheel for driving the telescopic flushing pipeline to expand and contract is arranged on the driving pipe. The eccentric wheel and the sealing disc are axially limited through a connecting piece. A first thrust spring for squeezing the eccentric wheel to move towards the water outlet tray is sleeved on the driving pipe.

[0007] Further, the output end of the speed reducer is connected to the driving pipe through a coupling.

[0008] Further, the telescopic flushing pipeline includes: a sealing shell, which is installed on the rotating shell. A cleaning main pipe is slidably arranged on the sealing shell. One end of the cleaning main pipe passes through the rotating shell and is connected to the eccentric wheel. A plurality of cleaning branch pipes are arranged on the cleaning main pipe. A plurality of second through holes communicating with the sealing shell are arranged on the cleaning main pipe. Guide inclined surfaces are arranged on both the cleaning main pipe and the eccentric wheel.

[0009] Further, an extended sealing pipe is arranged on the sealing shell, and the cleaning main pipe is placed inside the extended sealing pipe.

[0010] Further, both ends of the cleaning main pipe are closed ends.

[0011] Further, a ball is obliquely arranged at one end of the cleaning main pipe.

[0012] Further, a limiting ring and a second thrust spring are arranged on the cleaning main pipe, and the second thrust spring is placed between the limiting ring and the sealing shell.

[0013] Further, when the sealing disc contacts the water outlet tray, the water outlet tray is placed at the first through hole and blocks it.

[0014] Further, the connecting piece includes: a base ring, which is sleeved on the driving pipe. Two half rings are installed on the base ring through bolts to form an L-shaped cavity. An L-shaped limiting ring with an L-shaped cross section is arranged on the sealing disc, and the L-shaped limiting ring is placed inside the L-shaped cavity.

[0015] Furthermore, a driving tooth is axially slidably provided on the driving tube, the driving tooth is connected to the eccentric wheel located below, a fixed inner gear ring is provided in the rotating shell, and the driving tooth is meshed with the fixed inner gear ring through an intermediate wheel.

[0016] Furthermore, the gear ring is slidably mounted on the driving tube, a third thrust spring is arranged between the gear ring and the fixed base, fixed teeth are arranged on the fixed inner gear ring, the fixed teeth are engaged with the gear ring, and a driving ring in contact with the gear ring is arranged on the driving teeth.

[0017] Furthermore, a limiting column is arranged on the fixed base, a through hole is arranged on the gear ring, and the limiting column is placed in the through hole.

[0018] Furthermore, the third thrust spring is sleeved on the limiting column.

[0019] A flash evaporation wastewater treatment device comprises: a flash evaporation device and a heat exchange device for exchanging heat with steam exhaust steam generated by the flash evaporation device; a backwashing device for cleaning a demister is arranged on a slurry inlet pipe in the flash evaporation device.

[0020] Furthermore, the flash evaporation device and the heat exchange device are an integrated structure, and the exhaust steam generated by the flash evaporation device provides a heat source for the heat exchange device through a channel.

[0021] A multi-effect flash evaporation wastewater treatment device comprises a flash evaporation wastewater treatment device, wherein the flash evaporation device of the flash evaporation wastewater treatment device is connected with a plurality of flash evaporation components arranged in series and a heat exchange component paired with the flash evaporation components through a slurry discharge pipeline.

[0022] Furthermore, the flash evaporation assembly has the same structure as the flash evaporation device.

[0023] Furthermore, the heat exchange assembly has the same structure as the heat exchange device.

[0024] Furthermore, the heat exchange tubes of the heat exchange assembly and the heat exchange tubes of the heat exchange device are sequentially connected in series. Beneficial Effects

[0025] The present application can realize the extension and retraction of the telescopic flushing pipeline through the system's own power source without adding any external power components, thereby increasing the cleaning area of the defogger and improving the defog efficiency. There is no need to add any new power components, reduce equipment investment, and reduce maintenance cycles and maintenance costs.

[0026] The present application can make the contact process between the eccentric wheel and the ball smooth by providing a guiding inclined surface, and cooperate with the second thrust spring to achieve continuous reciprocating motion, thereby achieving efficient cleaning of the defogger.

[0027] When the present application is backwashed, the rotating housing rotates, and the telescopic cleaning main pipe cooperates with the rotation to comprehensively clean the demister. Therefore, the number of cleaning main pipes and the number of cleaning branch pipes can be greatly reduced. The reciprocating motion determines the number of cleaning branch pipes, and the rotation reduces the number of cleaning main pipes. Therefore, on the premise of improving the cleaning efficiency of the demister, the internal exhaust steam resistance is reduced, and the heat exchange efficiency is improved.

[0028] By reducing the number of backwash nozzles in the present application, the instantaneous spray volume of the system can be reduced, so that the situation of insufficient water flow of the spray water can be adapted. At the same time, the influence on the internal flashing environment of the flash evaporation unit is reduced, and the flash evaporation efficiency is further improved. Description of the Drawings

[0029] Figure 1 is a three-dimensional view of the multi-effect flash evaporation sewage and wastewater treatment device of the present invention; Figure 2 is a three-dimensional view of the flash evaporation sewage and wastewater treatment device of the present invention; Figure 3 is a structural schematic diagram of the flash evaporation sewage and wastewater treatment device of the present invention; Figure 4 is a structural schematic diagram of the backwashing device for the demister of the sewage and wastewater flash evaporation of the present invention; Figure 5 is the present invention Figure 4 partial enlarged view of A in; Figure 6 is the present invention Figure 4 partial enlarged view of B in. Detailed Embodiments

[0030] In the following description, a large number of specific details are given to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some well-known technical features in the art are not described.

[0031] Combined with the attached Figure 1 - attached Figure 6As shown in the figure: A backwashing device for a flash evaporation demister of sewage and wastewater. The backwashing device 11 is connected to the blade 14 in the slurry inlet pipe 13 through a speed reducer 12. The backwashing device 11 includes: a fixed base 111, on which a rotating housing 112 is provided. At least one telescopic flushing pipeline 113 is provided on the rotating housing 112. A water inlet pipe 114 and a driving pipe 115 are coaxially arranged on the rotating housing 112. The outlet of the water inlet pipe 114 is placed inside the driving pipe 115. A water outlet tray 116 is provided on the driving pipe 115. Two sealing disks 117 that are stationary relative to the rotating housing 112 are sleeved on the driving pipe 115. The two sealing disks 117 are located on both sides of the water outlet tray 116 and form a driving cavity. A first through hole 119 for communicating the telescopic flushing pipeline 113 and the driving cavity is provided on the rotating housing 112. An eccentric wheel 118 for driving the telescopic flushing pipeline 113 to expand and contract is provided on the driving pipe 115. The eccentric wheel 118 and the sealing disk 117 are axially limited through a connecting member 120. A first thrust spring 121 for squeezing the eccentric wheel 118 to move towards the water outlet tray 116 is sleeved on the driving pipe 115.

[0032] Among them, the backwashing device 11 is detachably connected to the reducer 12. The reducer 12 can be directly installed on the slurry inlet pipe 13 or installed inside the shell of the flash evaporator through a bracket, and is connected to the blade 14 through a transmission mechanism. The reducer 12 can preferably be a planetary gear reducer, or other reducers suitable for the installation environment can also be selected; the blade 14 is installed in the slurry inlet pipe 13 through a rotating shaft to obtain the kinetic energy possessed by the flowing slurry medium, without the need for an additional new power source. One end of the fixed base 111 is connected to the flange of the reducer 12 housing for fixation. A drive pipe 115 is rotatably installed on the fixed base 111. The drive pipe 115 is rotationally limited at one end through a bearing and an end pressing ring. The other end of the drive pipe 115 is coaxially fitted with the water inlet pipe 114. The water inlet pipe 114 is installed on the rotating housing 112 through a bearing seat. The water inlet pipe 114 is communicated with the backwashing main pipe. The backwashing main pipe is fixedly installed inside the shell of the flash evaporator. The rotating housing 112 can rotate relative to the fixed base 111, but cannot be separated, that is, axially separated. A rotating sealing ring is provided between the rotating housing 112 and the fixed base 111 to prevent external slurry from entering the inside and damaging the internal structure. The outlet of the water inlet pipe 114 is placed inside the drive pipe 115. A rotating seal is provided between the water inlet pipe 114 and the drive pipe 115 to prevent backwashing water from flowing out through the gap between the two. The water outlet tray 116 is in a disc shape. The water outlet tray 116 is fixedly installed on the drive pipe 115 and can be locked and fixed with bolts and sealed, or can be integrally formed with the drive pipe 115. A plurality of water outlets are provided at the edge of the water outlet tray 116 and a plurality of water channels are provided inside it. The water channels are communicated with the inside of the drive pipe 115 and then communicated with the water inlet pipe 114. The water outlet tray 116 also serves to isolate the two sealing discs 117, providing a position for backwashing water to enter the drive cavity between the two sealing discs 117, and at the same time preventing the two sealing discs 117 from closely fitting and being unable to separate. The drive cavity is the power center for opening and closing the entire telescopic flushing pipeline 113. At the same time, the backwashing water in the drive cavity enters the telescopic flushing pipeline 113 through the first through hole 119 to provide a power source for it, so that it can perform reciprocating motion. The movement of the eccentric wheel 118 is firstly realized by the movement of the sealing disc 117 to drive its separation action, and secondly, the reset action is realized through the first thrust spring 121. The edge of the sealing disc 117 cooperates with the inside of the rotating housing 112 to limit the rotation of the sealing disc 117, so that the sealing disc 117 can slide on the drive pipe 115 and can drive the eccentric wheel 118 to move. It should be noted that on the basis that the backwashing water can clean the demister, it also serves as the power source for the reciprocating motion of the telescopic flushing pipeline 113, and thus there is no need to add additional driving components such as a telescopic motor.It effectively prevents the problem of low service life of electrical components in a vacuum environment and reduces the dependence on the installation environment. The eccentric wheel 118 is provided with a guide slope to facilitate cooperation with the telescopic flushing pipeline 113. At the same time, the sealing disc 117 can be used to block the first through hole 119 to prevent the driving chamber inside the rotating shell 112 from being in a continuous negative pressure state, thereby effectively preventing the sealing disc 117 from squeezing the water outlet disc 116 to cause it to deform and affect the sealing effect, and preventing the backwashing water from slowly and continuously entering the flash chamber due to the valve on the backwashing main pipe not being closed tightly, thereby affecting the flashing efficiency.

[0033] Working principle: backwash water enters the drive pipe 115 through the water inlet pipe 114 and flows through the water outlet plate 116 into the drive cavity, and then enters the telescopic flushing pipeline 113 through the first through hole 119 by the driver to realize the discharge of backwash water. In this process, since the backwash water inflow is greater than the discharge volume, the two sealing plates 117 are driven away from the water outlet plate 116 by the water pressure of the backwash water to the limit, and then the eccentric wheel 118 contacts with the input end of the telescopic flushing pipeline 113 to realize the intervention of the power source of the telescopic flushing pipeline 113. Due to the continuous rotation of the eccentric wheel 118, the telescopic flushing pipeline 113 is driven to retract.

[0034] The present application can realize the extension and retraction of the telescopic flushing pipeline 113 through the system's own power source without adding any external power components, thereby increasing the cleaning area of the defogger and improving the defog efficiency. There is no need to add any new power components, reduce equipment investment, and reduce maintenance cycles and maintenance costs.

[0035] The output end of the reducer 12 is connected to the drive tube 115 through a coupling 15. In this arrangement, the coupling 15 is preferably a straight coupling to facilitate docking with the reducer 12 and reduce installation difficulty.

[0036] The telescopic flushing pipeline 113 includes: a sealed housing 1131, the sealed housing 1131 is installed on the rotating housing 112, a cleaning main pipe 1132 is slidably arranged on the sealed housing 1131, one end of the cleaning main pipe 1132 passes through the rotating housing 112 and is connected to the eccentric wheel 118, a plurality of cleaning branch pipes 1133 are arranged on the cleaning main pipe 1132, and a plurality of second through holes 1134 communicating with the sealed housing 1131 are arranged on the cleaning main pipe 1132. An extended sealing pipe 1135 is arranged on the sealed housing 1131, and the cleaning main pipe 1132 is placed inside the extended sealing pipe 1135. Both ends of the cleaning main pipe 1132 are closed ends, and guiding inclined surfaces 1139 are arranged on both the cleaning main pipe 1132 and the eccentric wheel 118. A ball 1136 is inclinedly arranged at one end of the cleaning main pipe 1132. A limiting ring 1137 and a second thrust spring 1138 are arranged on the cleaning main pipe 1132, and the second thrust spring 1138 is placed between the limiting ring 1137 and the sealed housing 1131. When the sealing disc 117 contacts the water outlet disc 116, the water outlet disc 116 is placed at the first through hole 119 and blocks it.

[0037] Among them, the sealed housing 1131 is installed on the outer wall of the rotating housing 112, and a sealing ring or gasket is provided therebetween. At least one cleaning branch pipe 1133 is provided on the sealed housing 1131. The cleaning branch pipe 1133 communicates with the sealed housing 1131. The cleaning branch pipe 1133 is vertically arranged on the sealed housing 1131 or the main cleaning pipe 1132, or is arranged at an angle on the sealed housing 1131 or the main cleaning pipe 1132. The specific angle and each angle are determined according to the actual situation. The cleaning branch pipe 1133 is fixedly connected or detachably connected to the sealed housing 1131 or the main cleaning pipe 1132, that is, integrally formed or welded, connected by bolts or screwed. Both ends of the main cleaning pipe 1132 can be blocked with plugs. A ball 1136 is embedded in one of the plugs. The position of the second through hole 1134 is ensured to be still inside the sealed housing 1131 or the extended sealing pipe 1135 when the main cleaning pipe 1132 is at the extended limit position. A sealing ring is provided in the extended sealing pipe 1135. The position of the limiting ring 1137 is required to be in contact with the outer arm of the sealed housing 1131 when the main cleaning pipe 1132 is at the contracted limit position, that is, when the ball 1136 contacts the minimum diameter point of the eccentric wheel 118. A waterproof sleeve can be sleeved on the second thrust spring 1138 to prevent scaling due to long-term contact with the backwashing water. The second thrust spring 1138 makes the main cleaning pipe 1132 receive a continuous inward movement trend, and cooperates with the eccentric wheel to realize an outward drive and thus realize a reciprocating motion. The ball 1136 is inclined on the guiding inclined surface 1139 of the main cleaning pipe 1132 and contacts and cooperates with the guiding inclined surface 1139 on the eccentric wheel 118. At the same time, the guiding inclined surface 1139 of the main cleaning pipe 1132 contacts and cooperates with the guiding inclined surface 1139 on the eccentric wheel 118 to guide the ball 1136 to a specified position. Other balls for reducing friction can be provided on the guiding inclined surface 1139.

[0038] Working process: When the eccentric wheel 118 separates, since the eccentric wheel 118 keeps rotating all the time, when it contacts the end of the main cleaning pipe 1132, the guiding inclined surfaces 1139 of the two come into contact first. At the same time, the main cleaning pipe 1132 is squeezed. Subsequently, the ball 1136 contacts the guiding inclined surface 1139 of the eccentric wheel 118. Finally, the eccentric wheel 118 reaches the limit position and continuously contacts and cooperates with the ball 1136. The limit position of the eccentric wheel 118 can be achieved by providing a limiting part on the drive pipe 115.

[0039] In this application, by providing a guiding inclined surface 1139, the contact process between the eccentric wheel 118 and the ball 1136 can be made smooth. Cooperating with the second thrust spring 1138, continuous reciprocating motion can be achieved, thereby realizing efficient cleaning of the demister 18.

[0040] The connecting member 120 includes: a base ring 1201, the base ring 1201 is sleeved on the drive tube 115, and two half rings 1202 are installed on the base ring 1201 through bolts to form an L-shaped cavity 1203. An L-shaped limiting ring 1204 with an L-shaped cross-section is provided on the sealing disc 117, and the L-shaped limiting ring 1204 is placed in the L-shaped cavity 1203.

[0041] Among them, the base ring 1201 is fixedly installed on the eccentric wheel 118, and the two half rings 1202 are installed on the base ring 1201 through bolts. The two half rings 1202 and the base ring 1201 cooperate to form an L-shaped cavity 1203 with an L-shaped cross-section. The L-shaped cavity 1203 and the L-shaped limiting ring 1204 cooperate to achieve axial traction and axial freedom. The L-shaped limiting ring 1204 can be welded or bolted to the sealing disc 117. A vertical groove can be provided on the rotating housing 112, and a protrusion is provided at the edge of the sealing disc 117. The two cooperate to circumferentially limit the sealing disc 117.

[0042] Working process: When the drive tube 115 rotates to drive the eccentric wheel 118 to rotate, the eccentric wheel 118 drives the base ring 1201 and the half rings 1202 to rotate, thereby realizing the rotation of the L-shaped cavity 1203. At this time, relative rotation occurs between the L-shaped cavity 1203 and the L-shaped limiting ring 1204. When the sealing disc 117 separates, it drives the L-shaped limiting ring 1204 to axially move, thereby driving the eccentric wheel 118 to axially move.

[0043] This application ensures that the axial movement of the sealing disc 117 can drive the eccentric wheel 118 in a rotating state to axially move through the connecting member 120.

[0044] A drive gear 122 is axially slidably arranged on the drive tube 115. The drive gear 122 is connected to the eccentric wheel 118 located below. A fixed internal gear ring 123 is arranged in the rotating housing 112. The drive gear 122 and the fixed internal gear ring 123 are meshed through an intermediate gear 129. The intermediate gear 129 is installed on the fixed base 111 through a limit post 128. A gear ring 124 is slidably sleeved on the drive tube 115. A third thrust spring 125 is arranged between the gear ring 124 and the fixed base 111. Fixed teeth 126 are arranged on the fixed internal gear ring 123. The fixed teeth 126 are in meshing cooperation with the gear ring 124. A drive ring 127 in contact with the gear ring 124 is arranged on the drive gear 122. A limit post 128 is arranged on the fixed base 111. A through hole is arranged on the gear ring 124. The limit post 128 is placed in the through hole. The third thrust spring 125 is sleeved on the limit post 128.

[0045] Among them, the drive gear 122 is fixedly connected to the eccentric wheel 118. In the non-backwashing state, the gear ring 124 is meshed with the fixed teeth 126, thereby restricting the rotating housing 112 from moving relative to the fixed base 111. When in the backwashing state, the drive gear 122 moves downward to drive the drive ring 127 to move, thereby driving the gear ring 124 to move downward along the limit post 128 to compress the third thrust spring 125, so that the gear ring 124 is separated from the fixed teeth 126. At the same time, the drive gear 122 is meshed with the fixed internal gear ring 123 through the intermediate gear 129. When the drive gear 122 rotates, it drives the rotating housing 112 to rotate.

[0046] In the present application, the rotating housing 112 rotates only during backwashing to cooperate with the telescopic cleaning main pipe 1132 to comprehensively clean the demister. Thereby, the number of the cleaning main pipes 1132 and the number of the cleaning branch pipes 1133 can be greatly reduced. The reciprocating motion determines the number of the cleaning branch pipes 1133, and the rotation reduces the number of the cleaning main pipes 1132. Therefore, on the premise of improving the cleaning efficiency of the demister, the internal exhaust steam resistance is reduced and the heat exchange efficiency is improved.

[0047] A flash evaporation sewage treatment device includes a flash evaporation device 16 and a heat exchange device 17 for exchanging heat with the steam exhaust generated by the flash evaporation device 16. An anti-backwashing device 11 for cleaning a demister 18 is arranged on a slurry inlet pipe 13 in the flash evaporation device 16.

[0048] The flash evaporation device 16 and the heat exchange device 17 are of an integral structure. The exhaust steam generated by the flash evaporation device 16 provides a heat source for the heat exchange device 17 through a channel.

[0049] A multi-effect flash evaporation sewage and wastewater treatment device, including a flash evaporation sewage and wastewater treatment device. The flash evaporation device 16 of the flash evaporation sewage and wastewater treatment device is connected with a plurality of serially arranged flash evaporation components 19 and heat exchange components 20 paired with the flash evaporation components 19 through a slurry discharge pipeline. The flash evaporation component 19 has the same structure as the flash evaporation device 16. The heat exchange component 20 has the same structure as the heat exchange device 17. The heat exchange tubes of the heat exchange component 20 and the heat exchange tubes of the heat exchange device 17 are serially connected in sequence.

[0050] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A backwashing device for a flash evaporation demister of sewage and wastewater. The backwashing device (11) is connected to a blade (14) in a slurry inlet pipe (13) through a speed reducer (12), and is characterized in that, The backwashing device (11) includes: a fixed base (111), on which a rotating housing (112) is provided. At least one telescopic flushing pipeline (113) is provided on the rotating housing (112). An inlet pipe (114) and a driving pipe (115) are coaxially arranged on the rotating housing (112). The outlet of the inlet pipe (114) is placed inside the driving pipe (115). A water outlet disc (116) is provided on the driving pipe (115). Two sealing discs (117) that are stationary relative to the rotating housing (112) are sleeved on the driving pipe (115). The two sealing discs (117) are located on both sides of the water outlet disc (116) and form a driving cavity. A first through hole (119) for communicating the telescopic flushing pipeline (113) and the driving cavity is provided on the rotating housing (112). An eccentric wheel (118) for driving the telescopic flushing pipeline (113) to achieve telescoping is provided on the driving pipe (115). The eccentric wheel (118) and the sealing disc (117) are axially limited through a connecting piece (120). A first thrust spring (121) for squeezing the eccentric wheel (118) to move towards the water outlet disc (116) is sleeved on the driving pipe (115).

2. The backwashing device for the flash evaporation demister of sewage and wastewater according to claim 1, wherein, The output end of the speed reducer (12) is connected to the driving pipe (115) through a coupling (15).

3. The backwashing device for the flash evaporation and demister of sewage and wastewater according to claim 2, characterized in that, The telescopic flushing pipeline (113) includes: a sealing housing (1131), which is installed on the rotating housing (112). A cleaning main pipe (1132) is slidably arranged on the sealing housing (1131). One end of the cleaning main pipe (1132) passes through the rotating housing (112) and is connected to the eccentric wheel (118). A plurality of cleaning branch pipes (1133) are provided on the cleaning main pipe (1132). A plurality of second through holes (1134) communicating with the sealing housing (1131) are provided on the cleaning main pipe (1132). Guide inclined surfaces (1139) are provided on both the cleaning main pipe (1132) and the eccentric wheel (118).

4. The backwashing device for a flash evaporation demister of sewage and wastewater according to claim 3, wherein, An extended sealing pipe (1135) is provided on the sealing housing (1131), and the cleaning main pipe (1132) is placed inside the extended sealing pipe (1135).

5. The backwashing device for the flash evaporation demister of sewage and wastewater according to claim 3, characterized in that, Both ends of the cleaning main pipe (1132) are closed ends.

6. The backwashing device for the flash evaporation demister of sewage and wastewater according to claim 3, wherein, A ball (1136) is inclinedly arranged at one end of the cleaning main pipe (1132).

7. The backwashing device for the flash evaporation demister of sewage and wastewater according to claim 3, characterized in that, A limit ring (1137) and a second thrust spring (1138) are provided on the cleaning main pipe (1132), and the second thrust spring (1138) is placed between the limit ring (1137) and the sealing housing (1131).

8. The anti-flushing device for the flash evaporation de-mister of sewage and wastewater according to claim 1, characterized in that, When the sealing disc (117) contacts the water outlet disc (116), the water outlet disc (116) is placed at the first through hole (119) and blocks it.

9. The backwashing device for the flash evaporation and demister of sewage and wastewater according to claim 1, wherein The connecting member (120) includes: a base ring (1201) sleeved on the drive tube (115), two half rings (1202) are mounted on the base ring (1201) by bolts to form an L-shaped cavity (1203), an L-shaped limiting ring (1204) with an L-shaped cross-section is arranged on the sealing disk (117), and the L-shaped limiting ring (1204) is placed in the L-shaped cavity (1203).

10. The backwashing device for a flash evaporation demister of sewage and wastewater according to claim 1, wherein A drive tooth (122) is axially slidably arranged on the drive tube (115), the drive tooth (122) is connected to the eccentric wheel (118) located below, a fixed internal gear ring (123) is arranged in the rotating housing (112), and the drive tooth (122) is meshed with the fixed internal gear ring (123) through an intermediate gear (129).

11. The backwashing device for a flash evaporation de-mister of sewage and wastewater according to claim 10, characterized in that, A toothed ring (124) is slidably sleeved on the drive tube (115), a third thrust spring (125) is arranged between the toothed ring (124) and the fixed base (111), fixed teeth (126) are arranged on the fixed internal gear ring (123), the fixed teeth (126) are in mating engagement with the toothed ring (124), and a drive ring (127) in contact with the toothed ring (124) is arranged on the drive tooth (122).

12. The anti-flushing device for the flash evaporation and demisting device of sewage and wastewater according to claim 11, wherein, A limiting post (128) is arranged on the fixed base (111), a through hole is arranged on the toothed ring (124), and the limiting post (128) is placed in the through hole.

13. The anti-flushing device for the flash evaporation demister of sewage and wastewater according to claim 12, characterized in that, The third thrust spring (125) is sleeved on the limiting post (128).

14. A flash evaporation sewage and wastewater treatment device, comprising: A flash evaporation device (16) and a heat exchange device (17) for exchanging heat with the steam exhausted from the flash evaporation device (16), characterized in that a backwashing device (11) for cleaning the demister (18) is arranged on the slurry inlet pipe (13) in the flash evaporation device (16).

15. The flash evaporation sewage and wastewater treatment device according to claim 14, characterized in that, The flash evaporation device (16) and the heat exchange device (17) are of an integral structure, and the exhausted steam generated by the flash evaporation device (16) provides a heat source for the heat exchange device (17) through a channel.

16. A multi-effect flash evaporation sewage and wastewater treatment device, characterized in that, Including the flash evaporation sewage treatment device of claim 14, the flash evaporation device (16) of the flash evaporation sewage treatment device is connected with a plurality of serially arranged flash evaporation components (19) and heat exchange components (20) paired with the flash evaporation components (19) through a slurry discharge pipeline.

17. The multi-effect flash evaporation sewage and wastewater treatment device according to claim 16, characterized in that, The flash evaporation component (19) has the same structure as the flash evaporation device (16).

18. The multi-effect flash evaporation sewage and wastewater treatment device according to claim 16, characterized in that, The heat exchange component (20) has the same structure as the heat exchange device (17).

19. The multi-effect flash evaporation sewage and wastewater treatment device according to claim 18, wherein, The heat exchange tubes of the heat exchange component (20) and the heat exchange tubes of the heat exchange device (17) are serially connected in sequence.

Images