Sewage treatment flow control device

Abstract

The utility model provides a sewage treatment flow control device belongs to sewage treatment technical field, including sewage flow valve, water inlet pipe fitting, filter and back flush subassembly, double position locking mechanism and back flush discharge subassembly, water inlet pipe fitting is by pipe fitting I and pipe fitting II butt joint constitution, filter plate, corner arm and sealing cover plate fixedly link into an integral structure, and rotate support connection in two pipe fittings connection position through switching shaft, the axle end of switching shaft is fixedly linked solid arm, is equipped with elastic support mechanism in solid arm, can make filter plate keep in filter station when no external force promotes lap joint pipe, back flush drain pipe is linked with pipe fitting II, and its export is equipped with normally closed bottom cover, can drive filter plate to turn to with back flush drain pipe directly opposite through the lap joint pipe, sealing cover plate closes pipe fitting water inlet end, opens bottom cover and utilizes the reverse flushing filter plate of water flow and exports impurity, loosens and is automatic reset, need not to dismantle the device, simple structure, convenient operation.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a wastewater treatment flow control device. Background Technology

[0002] In wastewater treatment, flow valves are typically installed on pipelines to regulate the flow rate, and filtration devices are installed upstream of the valves to trap suspended impurities in the wastewater, preventing large amounts of impurities from entering the flow valve and causing blockages and damage to its structure. In existing technologies, flow valves and filtration devices are usually separate units, with the filtration device often employing a fixed filter screen or filter cartridge structure installed inside a filter cylinder on the pipeline.

[0003] The above structure has the following shortcomings: First, the filter screen or filter element will gradually be clogged by impurities during operation. When the water resistance increases to a certain extent, it is necessary to close the upstream and downstream valves, disassemble the filter cartridge, and take out the filter element for manual cleaning or replacement. The operation is cumbersome and time-consuming, affecting the continuity of sewage treatment. Second, in some cases, a backwashing pipeline and a backwashing pump are installed in parallel next to the filter cartridge. External power is used to push clean water back into the filter element for rinsing. Although this can reduce the number of disassembly and assembly, the addition of the backwashing pump and supporting pipeline increases the equipment cost and floor space. Moreover, the main pipeline water supply still needs to be interrupted during backwashing. Utility Model Content

[0004] The purpose of this utility model is to provide a wastewater treatment flow control device that integrates filtration, backwashing and flow control functions into one unit. Without adding a backwashing power component, it utilizes the inlet water flow itself to achieve online backwashing and maintain the reliable sealing and resetting of the filtration station.

[0005] The purpose of this utility model is achieved through the following technical solution: a sewage treatment flow control device, including a sewage flow valve, an inlet pipe fitting, a filtration and backwashing assembly, and a backwash discharge assembly.

[0006] The inlet pipe fittings include fitting I and fitting II; the filtration and backwashing assembly includes a filter plate, a corner arm and a sealing cover; and the backwash discharge assembly includes a backwash drain pipe and a bottom cover.

[0007] The outlet end of fitting II is connected to the inlet end of fitting I, and the outlet end of fitting I is connected to the inlet end of the sewage flow valve. The inner wall of the inlet end of fitting I is provided with an inner retaining ring.

[0008] The structure formed by the filter plate, corner arm and sealing cover is located in the inner cavity of pipe fitting I and pipe fitting II. The outer wall of the filter plate is laterally fixed with a switching shaft, which is rotatably connected to the connection position of pipe fitting I and pipe fitting II. A first sealing ring is fixed to the side of the filter plate opposite to the inner retaining ring, and a second sealing ring is fixed to the side of the sealing cover opposite to the inner retaining ring. Fixed arms are fixed to both ends of the switching shaft, and overlapping pipes are laterally fixed between the outer ends of the fixed arms. An elastic support mechanism is provided in the fixed arm to make the first sealing ring fit with the inner retaining ring.

[0009] The backwash drain pipe is connected to the inner cavity of fitting II. When the sealing cover is rotated to the position where the second sealing ring and the inner retaining ring are in contact, the filter plate is rotated to the position directly opposite the backwash drain pipe. The outlet position of the backwash drain pipe is provided with a normally closed bottom cover.

[0010] The technical solution formed by this utility model is used as follows:

[0011] When the connecting pipe is not pushed by external force, the elastic support mechanism in the fixed arm keeps the first sealing ring and the inner retaining ring in contact, and the filter plate is in the filtration position; at the same time, the sealing cover is in the empty position, and the second sealing ring does not contact the inner retaining ring; the outlet of the backflushing drain pipe is kept normally closed by the bottom cover.

[0012] Wastewater flows in from the inlet end of pipe fitting II, passes through the inner cavity of pipe fitting II, and enters the communication area between pipe fitting I and pipe fitting II. Since the filter plate is located in this communication area, and the first sealing ring and the inner retaining ring are fitted together to form a circumferential seal, the wastewater cannot bypass the filter plate to the side of pipe fitting I, but must pass through the filter medium on the filter plate. Impurities in the wastewater with a particle size larger than the pore size of the filter medium are trapped on the surface of the filter plate facing pipe fitting II. The filtered water enters the wastewater flow valve through the inner cavity of pipe fitting I, and the output flow rate is regulated by the wastewater flow valve.

[0013] As the operating time increases, impurities trapped on the surface of the filter plate accumulate, and the water flow resistance gradually increases. When the water output decreases significantly or the pressure difference on both sides of the filter plate reaches the set threshold, a backwashing operation is required.

[0014] When performing backwashing, the operator moves the connecting pipe to the side away from the sewage flow valve. The connecting pipe drives the two fixed arms on both sides to rotate synchronously around the switching shaft. The fixed arms then drive the overall structure formed by the filter plate, corner arm and sealing cover to rotate around the switching shaft.

[0015] As the rotation angle increases, the first sealing ring of the filter plate gradually separates from the inner retaining ring, and the filter plate moves from the filtration station to the backwashing station, eventually rotating to a position directly opposite the backwash drain pipe; at the same time, the sealing cover rotates from the empty station to the position where the second sealing ring fits with the inner retaining ring and maintains its position, thereby sealing the water inlet end of pipe fitting I and cutting off the water path between pipe fitting I and the sewage flow valve.

[0016] After the workstation switch is completed, the operator opens the bottom cover to open the outlet of the backwash drain pipe. At this time, the sewage on the inlet side continues to flow into the inner cavity of pipe fitting II from the inlet end of pipe fitting II. However, the water passage between pipe fitting II and pipe fitting I has been sealed by the sealing cover, and the sewage cannot continue to flow towards pipe fitting I. Meanwhile, the filter plate has been rotated to a position directly opposite the backwash drain pipe. Under the guidance of the inner cavity of pipe fitting II, the sewage flows backward from the side of the filter plate facing pipe fitting I when it is in the filtration position and passes through the filter medium of the filter plate in the opposite direction. This flushes away the impurities trapped on the side of the filter plate facing pipe fitting II. The water carrying the impurities flows through the backwash drain pipe and is discharged to the outside of the device from the outlet opened by the bottom cover, completing the backwashing of the filter plate.

[0017] After backwashing, first close the bottom cover to restore the backwash drain pipe to its normally closed state; then loosen the connecting pipe, and the elastic support mechanism in the fixed arm drives the filter plate to rotate back to the filtration position, and the first sealing ring re-fits the inner retaining ring; the sealing cover plate rotates back to the empty position, the second sealing ring disengages from the inner retaining ring, and the water inlet end of fitting I is restored to conduction; the device automatically returns to the normal filtration working state.

[0018] By adopting the above technical solution, this utility model can achieve the following beneficial effects:

[0019] (1) This utility model only requires moving the connecting pipe to the side away from the sewage flow valve to drive the filter plate, corner arm and sealing cover plate to complete the work position switching in one go around the switching axis: the filter plate rotates to the position directly opposite the backwash drain pipe, and the sealing cover plate simultaneously closes the water inlet end of pipe fitting I; at this time, the bottom cover is opened, and the sewage on the inlet side passes through the filter medium of the filter plate in reverse, flushing away the trapped impurities and discharging them through the backwash drain pipe. The backwash is completed directly by the water flow of the inlet water itself. There is no need to set up additional backwash power components, nor is it necessary to disassemble the device or remove the filter plate for cleaning. The structure is simple and maintenance is convenient.

[0020] (2) In the absence of external force pushing the connecting pipe, the elastic support mechanism in the fixed arm keeps the first sealing ring and the inner retaining ring in contact. Sewage cannot bypass the filter plate to the side of pipe fitting I. It can only pass through the filter medium on the filter plate to complete the filtration, thus ensuring the reliability of filtration. After the backwashing is completed, the connecting pipe is loosened, and the elastic support mechanism drives the filter plate to automatically rotate back to the filtration position. The first sealing ring re-fits with the inner retaining ring. Without manual disassembly and alignment, the device can quickly restore the normal filtration working state, and the operation is simple. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the sewage flow valve of this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the water inlet pipe fitting of this utility model;

[0025] Figure 4 This is a schematic diagram of the inner retaining ring portion of this utility model;

[0026] Figure 5 This is a schematic diagram of the internal structure of the filtration and backwashing assembly of this utility model;

[0027] Figure 6 This is a schematic diagram of the filter plate portion of this utility model;

[0028] Figure 7 This is a schematic diagram of the external structure of the filtration and backwashing assembly of this utility model;

[0029] Figure 8 This is a first-view structural schematic diagram of the backflushing emission assembly of this utility model;

[0030] Figure 9 This is a structural schematic diagram of the backflushing emission component of this utility model from a second perspective.

[0031] Figure label:

[0032] 1. Sewage flow valve; 2. Inlet pipe fitting; 3. Filtration and backwashing assembly; 4. Double-position locking mechanism; 5. Backwash discharge assembly; 101. Valve body; 102. Valve core; 103. Valve cover; 104. Adjusting screw; 105. Sealing seat; 106. Adjusting seat; 107. Handwheel; 201. Fitting I; 202. Inner retaining ring; 203. First empty cavity; 204. Fitting II; 205. Overlap sealing ring; 206. Second empty cavity; 301. First slot; 302. First semi-circular shaft hole; 303. Second slot; 304. Second semi-circular shaft hole; 305. Filter plate; 306. Ear seat; 307. Switching shaft; 308. Side seat; 309. Side sealing ring; 310. Side cover; 311. Corner arm; 312. Sealing cover plate; 313. First sealing ring; 314. Second sealing ring; 315. Fixed arm; 316. Overlapping pipe; 317. Slide seat; 318. Slide column; 319. Fixed sleeve; 320. Compression spring; 321. Guide column; 322. Guide groove; 323. Rotary hole; 401. Sleeve; 402. Insertion column; 403. Top spring; 404. First clamping sleeve; 405. Second clamping sleeve; 501. Backflush drain pipe; 502. Bottom cover; 503. Fixed seat; 504. Moving rotating seat; 505. Drainage sealing gasket; 506. Opening and closing seat; 507. Closing bolt; 508. Opening and closing shaft; 509. Closing nut; 510. Snap-fit ​​platform. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] Example 1:

[0036] This utility model is based on a sewage flow valve 1, an inlet pipe 2, a filtration and backwashing assembly 3, and a backwash discharge assembly 5, to realize the normal filtration and backwashing operation of the filter plate 305. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8 and Figure 9 As shown;

[0037] The outlet end of fitting II 204 in the inlet fitting 2 is connected to the inlet end of fitting I 201, the outlet end of fitting I 201 is connected to the inlet end of sewage flow valve 1, and the inner wall of the inlet end of fitting I 201 is provided with an inner retaining ring 202.

[0038] The structure formed by the filter plate 305, the corner arm 311, and the sealing cover plate 312 is located in the inner cavity of pipe fitting I 201 and pipe fitting II 204. The outer wall of the filter plate 305 is laterally fixed with a switching shaft 307. The switching shaft 307 is rotatably connected to the connection position of pipe fitting I 201 and pipe fitting II 204. A first sealing ring 313 is fixedly connected to the side of the filter plate 305 opposite to the inner retaining ring 202. A second sealing ring 314 is fixedly connected to the side of the sealing cover plate 312 opposite to the inner retaining ring 202. Fixed arms 315 are fixedly connected to both ends of the switching shaft 307. A connecting pipe 316 is laterally fixed between the outer ends of the fixed arms 315. The fixed arms 315 are provided with an elastic support mechanism that makes the first sealing ring 313 fit with the inner retaining ring 202, so that the filter plate 305 is always in the filtration position when there is no external force pushing the connecting pipe 316.

[0039] The backwash drain pipe 501 is connected to the inner cavity of the fitting II 204. When the sealing cover plate 312 is rotated to the position where the second sealing ring 314 and the inner retaining ring 202 are in contact, the filter plate 305 is rotated to the position directly opposite the backwash drain pipe 501. The outlet position of the backwash drain pipe 501 is provided with a normally closed bottom cover 502.

[0040] By moving the connecting pipe 316 away from the sewage flow valve 1, the structure formed by the filter plate 305, the corner arm 311 and the sealing cover 312 can be rotated around the switching shaft 307, so that the filter plate 305 rotates from the filtration station to the backwashing station, and the sealing cover 312 rotates from the empty station to the station where the second sealing ring 314 and the inner retaining ring 202 are sealed and fitted.

[0041] The working principle is as follows:

[0042] When the connecting pipe 316 is not pushed by external force, the elastic support mechanism in the fixed arm 315 keeps the first sealing ring 313 and the inner retaining ring 202 in contact, and the filter plate 305 is in the filtration position; at the same time, the sealing cover plate 312 is in the empty position, and the second sealing ring 314 does not contact the inner retaining ring 202; the outlet of the backwash drain pipe 501 is kept normally closed by the bottom cover 502.

[0043] Wastewater flows in from the inlet end of pipe fitting II 204, passes through the inner cavity of pipe fitting II 204 and enters the communication area between pipe fitting I 201 and pipe fitting II 204. Since filter plate 305 is located in this communication area and the first sealing ring 313 and the inner retaining ring 202 are fitted together to form a circumferential seal, the wastewater cannot bypass the filter plate 305 to the side of pipe fitting I 201, but must pass through the filter medium on the filter plate 305. Impurities in the wastewater with a particle size larger than the pore size of the filter medium are trapped on the surface of the filter plate 305 facing pipe fitting II 204. The filtered water enters the wastewater flow valve 1 through the inner cavity of pipe fitting I 201, and the output flow rate is regulated by the wastewater flow valve 1.

[0044] Furthermore, due to the presence of sewage pressure, and with the use of the elastic support mechanism in the fixed arm 315, the filter plate 305 can be stably positioned in the filtration station when water pressure is present.

[0045] As the operating time increases, impurities trapped on the surface of filter plate 305 accumulate continuously. The backwashing cycle is determined based on the influent water quality, and the water quality threshold is set at a suspended solids concentration of 150 mg / L. When the influent suspended solids concentration is not higher than 150 mg / L, a backwashing operation is performed every 48 hours; when the influent suspended solids concentration is higher than 150 mg / L, a backwashing operation is performed every 24 hours.

[0046] Suspended solids concentration was chosen as the water quality criterion because filter plate 305 directly intercepts particulate impurities, and the suspended solids concentration has the most direct relationship with the filter plate load. 150 mg / L is a common dividing line for urban sewage. Below this value is considered a light load (48-hour cycle), and above this value is considered a high load (24-hour cycle), so there is no need to install additional differential pressure sensors or flow monitoring devices.

[0047] When performing backwashing, the operator moves the connecting pipe 316 away from the sewage flow valve 1. The connecting pipe 316 drives the two fixed arms 315 to rotate synchronously around the switching shaft 307. The fixed arms 315 then drive the filter plate 305, the corner arm 311 and the sealing cover plate 312 to rotate around the switching shaft 307.

[0048] As the rotation angle increases, the first sealing ring 313 of the filter plate 305 gradually disengages from the inner retaining ring 202, and the filter plate 305 moves from the filtration station to the backwashing station, eventually rotating to a position directly opposite the backwash drain pipe 501; at the same time, the sealing cover plate 312 rotates from the empty station to the position where the second sealing ring 314 fits against the inner retaining ring 202 and is held in position, thereby sealing the water inlet end of the pipe fitting I 201 and cutting off the water path between the pipe fitting I 201 and the sewage flow valve 1.

[0049] It should be noted that during the switching process of the filter plate 305 from the filtration station to the backwashing station, there is a brief transition gap between the first sealing ring 313 disengaging from the inner retaining ring 202 and the second sealing ring 314 fitting with the inner retaining ring 202. A small amount of unfiltered sewage will enter the pipe fitting I201 through this gap and flow into the sewage flow valve 1. However, since the station switching operation time is extremely short, this transition gap only lasts for a few seconds. The amount of unfiltered sewage entering the sewage flow valve 1 is extremely small, and a small amount of impurities will not accumulate in the valve cavity, thus not affecting the overall service life of the sewage flow valve 1.

[0050] After the workstation switch is completed, the operator opens the bottom cover 502, opening the outlet of the backwash drain pipe 501. At this time, the sewage on the inlet side continues to flow into the inner cavity of pipe fitting II 204 from the inlet end of pipe fitting II 204. However, the water passage between pipe fitting II 204 and pipe fitting I 201 has been sealed by the sealing cover plate 312, and the sewage cannot continue to flow towards pipe fitting I 201. Meanwhile, the filter plate 305 has been rotated to a position directly opposite the backwash drain pipe 501. Under the guidance of the inner cavity of pipe fitting II 204, the sewage flows backward from the side of filter plate 305 facing pipe fitting I 201 when it is in the filtration position, passing through the filter medium of filter plate 305 in the opposite direction. This flushes away the impurities trapped on the side of filter plate 305 facing pipe fitting II 204. The water carrying the impurities flows through the backwash drain pipe 501 and is discharged to the outside of the device from the outlet opened by the bottom cover 502, completing the backwashing of filter plate 305.

[0051] Similarly, during the backwashing process, the wastewater flows from the side of the filter plate 305 facing the pipe fitting I 201 and passes through the filter medium of the filter plate 305 in the reverse direction, flushing away the impurities trapped on the side of the filter plate 305 facing the pipe fitting II 204; however, the backwash water flow itself still contains a certain concentration of suspended particles. After passing through the filter medium of the filter plate 305 in the reverse direction, some particles will be trapped and remain on the surface of the side of the filter plate 305 facing the pipe fitting I 201.

[0052] After backwashing is completed, filter plate 305 returns to its filtration position, and sewage resumes normal flow from fitting II 204 to fitting I 201. At this time, sewage passes through the filter medium of filter plate 305 from the side of filter plate 305 facing fitting II 204, flushing away the small amount of particles remaining on the back side (facing fitting I 201) from the surface of filter plate 305. These particles then enter fitting I 201 with the water flow and flow into sewage flow valve 1. However, since the amount of residual particles is extremely small, they will not settle in the valve cavity after entering sewage flow valve 1, nor will they affect the adjustment accuracy and service life of sewage flow valve 1.

[0053] After backwashing, first close the bottom cover 502 to restore the backwash drain pipe 501 to its normally closed state; then loosen the connecting pipe 316, and the elastic support mechanism in the fixed arm 315 drives the filter plate 305 to rotate back to the filtration position, and the first sealing ring 313 re-fits with the inner retaining ring 202; the sealing cover plate 312 rotates back to the empty position, the second sealing ring 314 disengages from the inner retaining ring 202, and the water inlet end of the fitting I 201 is restored to conduction; the device automatically returns to the normal filtration working state.

[0054] The specific structure of sewage flow valve 1 and inlet pipe 2 is as follows: Figure 2 , Figure 3 and Figure 4 As shown, the inlet end of the valve body 101 is connected to the outlet end of the pipe fitting I201, and the outlet end of the valve body 101 is connected to the external drainage pipe. The valve core 102 is axially movable inside the valve body 101. The valve cover 103 is fixedly installed on the top of the valve body 101. An adjusting knob 106 is fixedly connected to the middle of the top of the valve cover 103. A sealing knob 105 is fixedly connected to the middle of the bottom of the valve cover 103. The threaded part of the adjusting screw 104 is connected to the adjusting knob 106. The smooth part of the adjusting screw 104 is sealed and inserted into the sealing knob 105. The handwheel 107 is fixedly connected to the upper end of the adjusting screw 104. The lower end of the adjusting screw 104 is rotatably connected to the top of the valve core 102.

[0055] Furthermore, when the axial position of the valve core 102 is adjusted by turning the adjusting screw 104 to control the flow rate of sewage, the smooth part of the adjusting screw 104 is always sealed and inserted into the sealing seat 105.

[0056] An overlapping sealing ring 205 is sandwiched between the mating end faces of pipe fitting I 201 and pipe fitting II 204. The first empty cavity 203 is located at the lower end of the inner cavity of pipe fitting I 201, and the lower end of the inner cavity of pipe fitting II 204 is provided with a second empty cavity 206.

[0057] The filter plate 305 and the sealing cover plate 312 are located in the communication area between the first empty cavity 203 and the second empty cavity 206, and the switching shaft 307 passes through the junction of the first empty cavity 203 and the second empty cavity 206.

[0058] The specific structures of the filtration and backwashing assembly 3 and the backwash discharge assembly 5 are as follows: Figure 4 , Figure 5 , Figure 6 , Figure 8 and Figure 9 As shown, a first groove 301 and a second groove 303 are respectively provided on the mating end faces of pipe fitting I 201 and pipe fitting II 204. A first semi-circular shaft hole 302 is provided at the bottom of the first groove 301, and a second semi-circular shaft hole 304 is provided at the bottom of the second groove 303. The first semi-circular shaft hole 302 and the second semi-circular shaft hole 304 are joined together to form a shaft hole for rotating support of the switching shaft 307.

[0059] The ear seat 306 is fixed to the outer wall of the filter plate 305. The switching shaft 307 is inserted into the ear seat 306. The outer walls of the pipe fitting II 204 are fixed with side seats 308 on both sides. The side cover 310 is fixed to the outer end of the side seat 308 and the side sealing ring 309 is pressed into the body of the side seat 308. The two ends of the switching shaft 307 pass through the side seat 308 and are fixed to the fixed arm 315. The body of the overlapping sealing ring 205 is also provided with a swivel hole 323 for passing through the switching shaft 307.

[0060] Both sides of the outer wall of the fitting II204 are fixedly connected to slide blocks 317. A slide column 318 is slidably connected in the slide block 317. A fixed sleeve 319 is fixedly connected to the end of the slide column 318 away from the slide block 317. A guide groove 322 is opened in the main body of the fixed arm 315. A guide column 321 is laterally fixed to the side of the fixed sleeve 319. The guide column 321 is slidably fitted in the guide groove 322. A compression spring 320 is sleeved on the slide column 318 and abuts between the slide block 317 and the fixed sleeve 319 to provide the fixed arm 315 with an elastic force that causes the filter plate 305 to move toward the filtration station.

[0061] When in the filtration position, the direction of the sewage pressure is consistent with the direction of the elastic force of the elastic support mechanism. The greater the water pressure, the tighter the first sealing ring 313 fits with the inner retaining ring 202, forming a seal that is adaptively enhanced with pressure. Under the combined action of water pressure and elastic force, the filter plate 305 is stably maintained in the filtration position and will not be accidentally displaced due to water flow impact.

[0062] The backflush drain pipe 501 is connected to the bottom wall of the second empty cavity 206 and communicates with the inner cavity of the second empty cavity 206. A fixed seat 503 is fixed to one end of the outer wall of the outlet of the backflush drain pipe 501, and a locking platform 510 is fixed to the other end of the outer wall of the outlet of the backflush drain pipe 501. A movable rotating seat 504 is hinged to the fixed seat 503. One side wall of the bottom cover 502 is fixed to the movable rotating seat 504, and the other side wall is fixed to the opening / closing seat 506. A closing bolt 507 is hinged to the opening / closing shaft 508. On the opening and closing seat 506, the drain sealing gasket 505 is installed on the bottom cover 502 on the side opposite to the outlet of the backflushing drain pipe 501. The closing bolt 507 can rotate around the opening and closing shaft 508. When the bottom cover 502 rotates to the position that closes the outlet of the backflushing drain pipe 501, after the closing bolt 507 is put into the snap-fit ​​table 510, the bottom end of the closing nut 509 is pressed against the top end of the snap-fit ​​table 510 by tightening the closing nut 509, thereby locking the bottom cover 502 in the closed position.

[0063] During backflushing, simply loosen the closing nut 509 and unscrew the closing bolt 507 from the locking platform 510 to open the bottom cover 502 and open the outlet of the backflushing drain pipe 501. The operation is quick and effortless. When closing, insert the closing bolt 507 into the locking platform 510 and tighten the closing nut 509. The bottom end of the closing nut 509 presses against the top end of the locking platform 510, reliably locking the bottom cover 502 in the closed position. The tightening degree is adjustable, which can compensate for the compression deformation and wear of the drain sealing gasket 505 and maintain a long-term reliable seal at the outlet of the backflushing drain pipe 501.

[0064] In addition, when switching work positions under normal filtration operation, the operator must overcome two resistances when pulling the connecting pipe 316 away from the sewage flow valve 1: one is the impact force and water pressure thrust generated by the sewage flow on the filter plate 305, and the other is the elastic restoring force exerted by the compression spring 320 on the fixed arm 315 in the elastic support mechanism towards the filtration work position.

[0065] The above operation does not require closing the sewage flow valve 1 because: the fixed arm 315 rotates around the switching shaft 307 as the fulcrum, and the connecting pipe 316 is located at the outer end of the fixed arm 315. The distance from the point of force application to the fulcrum is much greater than the distance from the point of resistance to the fulcrum, forming a force-saving lever structure. The force applied by the operator to the connecting pipe 316 is amplified by the lever and is sufficient to overcome the water pressure thrust and elastic restoring force, so as to realize the switching of the filter plate 305 and the reliable fit between the second sealing ring 314 and the inner retaining ring 202.

[0066] Therefore, without interrupting water supply or shutting off valves, operators can switch workstations simply by manually operating the connecting pipe 316, without the need for additional power actuators.

[0067] Example 2:

[0068] Based on Embodiment 1, this utility model improves safety by adding a double-position locking mechanism 4, for example... Figure 1 and Figure 7 As shown;

[0069] In the double-position locking mechanism 4, the sleeve 401 is slidably connected to the outer wall of the connecting pipe 316, and the insertion post 402 is fixed to the head end of the sleeve 401 and will not interfere with the sliding of the sleeve 401 along the connecting pipe 316.

[0070] A first ferrule 404 is fixedly connected to the inlet flange of pipe fitting I 201, and a second ferrule 405 is fixedly connected to the outer wall of pipe fitting II 204;

[0071] The top spring 403 is sleeved on the connecting pipe 316 and abuts between the sleeve 401 and the fixed arm 315 on one side, and is used to provide support elastic force for the plug post 402 towards the first ferrule 404 and the second ferrule 405.

[0072] The first clamping sleeve 404 corresponds to the filtration position of the filter plate 305, and the second clamping sleeve 405 corresponds to the backwashing position of the filter plate 305. When the filter plate 305 is in the filtration position, the head of the plug-in post 402 can be engaged in the first clamping sleeve 404. When the filter plate 305 is in the backwashing position, the head of the plug-in post 402 can be engaged in the second clamping sleeve 405. Both positions can be automatically locked without the operator having to apply continuous force to maintain them, preventing water flow impact or accidental contact with the connecting pipe 316 from causing the filter plate 305 to rotate unexpectedly, thus improving the safety of use. When switching positions, the sleeve 401 and the top spring 403 can be slid along the connecting pipe 316 towards the fixed arm 315 to disengage the plug-in post 402 from the clamping sleeve. Unlocking and turning can be completed continuously with one hand, making the operation simple. Moreover, the sleeve 401 and the plug-in post 402 are both fitted onto the connecting pipe 316, without occupying additional installation space outside the pipe fittings.

Claims

1. A sewage treatment flow control device comprising a sewage flow valve (1) and a water inlet fitting (2), characterised in that: It also includes a filtration and backwashing assembly (3) and a backwash discharge assembly (5); The inlet pipe fitting (2) includes fitting I (201) and fitting II (204), the filtration and backwashing assembly (3) includes a filter plate (305), a corner arm (311) and a sealing cover (312), and the backwash discharge assembly (5) includes a backwash drain pipe (501) and a bottom cover (502). The outlet end of fitting II (204) is connected to the inlet end of fitting I (201), the outlet end of fitting I (201) is connected to the inlet end of sewage flow valve (1), and the inner wall of the inlet end of fitting I (201) is provided with an inner retaining ring (202). The structure formed by the filter plate (305), corner arm (311), elastic support mechanism and sealing cover plate (312) is located in the inner cavity of pipe fitting I (201) and pipe fitting II (204). The outer wall of the filter plate (305) is fixedly provided with a switching shaft (307). The switching shaft (307) is rotatably connected to the connection position of pipe fitting I (201) and pipe fitting II (204). The side of the filter plate (305) opposite to the inner retaining ring (202) is fixedly connected with a first sealing ring (313). The side of the sealing cover plate (312) opposite to the inner retaining ring (202) is fixedly connected with a second sealing ring (314). The switching shaft (305) is fixedly connected with the inner retaining ring (202). 7) Both sides of the shaft end are fixedly connected with fixed arms (315), and the outer ends of the fixed arms (315) are fixedly connected with overlapping pipes (316). The fixed arms (315) are provided with an elastic support mechanism that makes the first sealing ring (313) fit with the inner retaining ring (202). The backwash drain pipe (501) is connected to the inner cavity of the pipe fitting II (204). When the sealing cover plate (312) is rotated to the position where the second sealing ring (314) fits with the inner retaining ring (202), the filter plate (305) is rotated to the position directly opposite the backwash drain pipe (501). The outlet position of the backwash drain pipe (501) is provided with a normally closed bottom cover (502). The elastic support mechanism includes a fixed sleeve (319), a compression spring (320), and a guide groove (322). Both sides of the outer wall of the pipe fitting II (204) are fixedly connected to a slide block (317). A slide column (318) is slidably connected in the slide block (317). The fixed sleeve (319) is fixedly connected to the end of the slide column (318) away from the slide block (317). The guide groove (322) is opened in the main body of the fixed arm (315). A guide column (321) is fixedly connected to the side of the fixed sleeve (319). The guide column (321) is slidably fitted in the guide groove (322). The compression spring (320) is sleeved on the slide column (318) and abuts against the slide block (317) and the fixed sleeve (319).

2. A sewage treatment flow control device according to claim 1, characterised in that: The sewage flow valve (1) includes a valve body (101), an adjusting screw (104), a sealing seat (105), and a handwheel (107). The inlet end of the valve body (101) is connected to the pipe fitting I (201). The valve core (102) is axially movable inside the valve body (101). A valve cover (103) is fixedly installed on the top of the valve body (101). An adjusting seat (106) is fixedly connected to the middle of the top of the valve cover (103). The sealing seat (105) is fixedly connected to the middle of the bottom of the valve cover (103). The threaded part of the adjusting screw (104) is connected to the adjusting seat (106). The smooth part of the adjusting screw (104) is sealed and inserted into the sealing seat (105). The handwheel (107) is fixedly connected to the upper end of the adjusting screw (104). The lower end of the adjusting screw (104) is rotatably connected to the top of the valve core (102).

3. A sewage treatment flow control device according to claim 1 or 2, wherein: The water inlet fitting (2) also includes a first empty cavity (203), and an overlapping sealing ring (205) is sandwiched between the mating end faces of fitting I (201) and fitting II (204). The first empty cavity (203) is located at the lower end of the inner cavity of fitting I (201), and a second empty cavity (206) is provided at the lower end of the inner cavity of fitting II (204).

4. A sewage treatment flow control device according to claim 3, wherein: The filtration and backwashing assembly (3) also includes an ear seat (306), a side sealing ring (309), and a side cover (310). A first groove (301) and a second groove (303) are respectively provided on the mating end faces of pipe fitting I (201) and pipe fitting II (204). A first semi-circular shaft hole (302) is provided at the bottom of the first groove (301), and a second semi-circular shaft hole (304) is provided at the bottom of the second groove (303). The first semi-circular shaft hole (302) and the second semi-circular shaft hole (304) are joined together to form a shaft hole for the rotating support of the switching shaft (307). The ear seat (306) is fixed to the outer wall of the filter plate (305), the switching shaft (307) is inserted into the ear seat (306), the outer walls of the pipe fitting II (204) are fixed with side seats (308), the side cover (310) is fixed to the outer end of the side seat (308), and the side sealing ring (309) is pressed into the body of the side seat (308). The two ends of the switching shaft (307) pass through the side seat (308) and are fixed to the fixed arm (315). The body of the overlapping sealing ring (205) is also provided with a swivel hole (323) for passing through the switching shaft (307).

5. A sewage treatment flow control device according to claim 3, wherein: The backflush discharge assembly (5) also includes a fixed base (503), a movable rotating base (504), a drain sealing gasket (505), an opening and closing base (506), a closing bolt (507), an opening and closing shaft (508), a closing nut (509), and a locking platform (510). The backflush drain pipe (501) is connected to the bottom wall of the second empty cavity (206) and communicates with the inner cavity of the second empty cavity (206). The fixed base (503) is fixed to one end of the outer wall of the outlet of the backflush drain pipe (501), and the locking platform (510) is fixed to the other end of the outer wall of the outlet of the backflush drain pipe (501). The movable rotating base (504) is hinged to the fixed base (503). On the top, one side wall of the bottom cover (502) is fixed to the rotating seat (504), and the other side wall is fixed to the opening and closing seat (506). The closing bolt (507) is hinged to the opening and closing seat (506) through the opening and closing shaft (508). The drainage sealing gasket (505) is installed on the bottom cover (502) on the side opposite to the outlet of the backwash drain pipe (501). The closing bolt (507) can rotate around the opening and closing shaft (508), and through the closing nut (509) that cooperates with the closing bolt (507), the bottom end of the closing nut (509) is pressed against the top end of the snap-fit ​​table (510), locking the bottom cover (502) in the closed position.

6. A sewage treatment flow control device according to claim 4, wherein: The backflush discharge assembly (5) also includes a fixed base (503), a movable rotating base (504), a drain sealing gasket (505), an opening and closing base (506), a closing bolt (507), an opening and closing shaft (508), a closing nut (509), and a locking platform (510). The backflush drain pipe (501) is connected to the bottom wall of the second empty cavity (206) and communicates with the inner cavity of the second empty cavity (206). The fixed base (503) is fixed to one end of the outer wall of the outlet of the backflush drain pipe (501), and the locking platform (510) is fixed to the other end of the outer wall of the outlet of the backflush drain pipe (501). The movable rotating base (504) is hinged to the fixed base (503). On the top, one side wall of the bottom cover (502) is fixed to the rotating seat (504), and the other side wall is fixed to the opening and closing seat (506). The closing bolt (507) is hinged to the opening and closing seat (506) through the opening and closing shaft (508). The drainage sealing gasket (505) is installed on the bottom cover (502) on the side opposite to the outlet of the backwash drain pipe (501). The closing bolt (507) can rotate around the opening and closing shaft (508), and through the closing nut (509) that cooperates with the closing bolt (507), the bottom end of the closing nut (509) is pressed against the top end of the snap-fit ​​table (510), locking the bottom cover (502) in the closed position.

7. A sewage treatment flow control device according to claim 1 or 2, wherein: It also includes a double-position locking mechanism (4), which includes a sleeve (401), a plug post (402) and a top spring (403). The sleeve (401) is slidably connected to the outer wall of the connecting pipe (316), the plug post (402) is fixed to the head end of the sleeve (401), a first ferrule (404) is fixed to the inlet flange of fitting I (201), a second ferrule (405) is fixed to the outer wall of fitting II (204), and the top spring (403) is sleeved on the connecting pipe (316) and abuts against the sleeve (401) and one of the fixed arms (315).

Images