Full-automatic blowdown backwashing prefilter

Abstract

The utility model relates to a full-automatic blowdown backwash prefilter, which comprises a controller, a machine head with a water inlet channel and a water outlet channel, a filter bottle and a filtering and backwash mechanism arranged in the filter bottle, the filtering and backwash mechanism comprises a filtering structure and a backwash mechanism which are coaxially arranged, an inner cavity of the backwash mechanism is a water purification cavity, and the water purification cavity is communicated with the filter bottle. A cavity between the filtering mechanism and the filtering bottle is a raw water cavity, a sewage discharging cavity is formed in the bottom of the filtering bottle, a sewage discharging part is arranged in the sewage discharging cavity, a sewage discharging channel is formed in the sewage discharging part, and the electric sewage discharging mechanism comprises a driving motor assembly, a control assembly, a transmission assembly and a sewage discharging switching assembly. The pre-filter is more optimized in structure, and is not easy to cause faults such as jamming and the like in the aspects of installation, use and maintenance. The pre-filter has a full-automatic pollution discharge function, can integrate a water leakage protection function, can close a water path in a water leakage state, realizes water leakage monitoring protection, and is compact in structure, safe and reliable.

Description

Technical Field

[0001] The utility model relates to a full-automatic sewage draining and backwashing pre-filter, belonging to the technical field of water purification equipment. Background Art

[0002] The pre-filter in the prior art includes: a machine head, a filter bottle connected to the upper end of the machine head, and a drain ball valve connected to the lower end of the filter bottle. A filter screen skeleton is arranged in the filter bottle, and a filter screen is sleeved on the outer wall of the filter screen skeleton. During use, water flows into the gap between the filter bottle and the filter screen from the water inlet of the machine head, flows through the filter screen and then into the center of the filter screen skeleton, and then flows from the center of the filter screen skeleton to the water outlet of the machine head. The pre-filter has now entered thousands of households and high-end hotels.

[0003] During the use of the pre-filter, it is necessary to clean the impurities attached to the surface of the filter screen in situ at irregular intervals, and then discharge them through the drain ball valve. Realizing the full-automatic cleaning and sewage draining of the pre-filter is also the future development trend of this type of product. During the use of the pre-filter, the supporting pipe network often leaks due to accidental situations such as aging, leakage, rupture of the water pipe, the faucet not being tightened or forgotten to be turned off. On the one hand, it causes waste of water resources and increases water bills. On the other hand, in severe cases, it will endanger the building, resulting in damage to the house and property losses. Especially in densely populated residential areas, a leak in one place may cause losses to multiple adjacent and lower units, bringing inconvenience to the daily life of residents. In places such as high-end hotels, a water pipe burst may cause a flood, which will seriously damage the high-end facilities in the hotel. Such situations occur frequently in real life. Therefore, the monitoring and protection of water leakage are very necessary. Detecting and solving problems early can avoid the expansion of potential hazards, and the water leakage monitoring and protection equipment has emerged as the times require. The utility model aims to provide a full-automatic sewage draining and backwashing pre-filter with a more optimized structure and easy to be realized industrially. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the deficiencies of the pre-filter in the prior art and provide a full-automatic sewage draining and backwashing pre-filter. This pre-filter has a more optimized structure, is convenient for installation, use and maintenance, and is not easy to cause faults such as jamming. This pre-filter has a full-automatic sewage draining function and can also integrate a water leakage protection function, and can close the water circuit in the water leakage state to realize water leakage monitoring and protection. That is to say, the pre-filter of the utility model can realize the sewage draining and the water leakage protection valve closing action controlled by one motor, with a compact structure, safety and reliability.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] Full-automatic sewage draining and backwashing pre-filter, comprising a controller, a machine head with an inlet channel and an outlet channel, a filter bottle, and a filtering and backwashing mechanism disposed within the filter bottle. The filtering and backwashing mechanism includes a coaxially arranged filtering structure and a backwashing mechanism. The inner cavity of the backwashing mechanism is a purified water cavity, the cavity between the filtering mechanism and the filter bottle is a raw water cavity, a sewage draining cavity is provided at the bottom of the filter bottle, a sewage draining member is provided within the sewage draining cavity, the sewage draining member is provided with a sewage draining channel, and an electric sewage draining mechanism is further included. The electric sewage draining mechanism includes a driving motor assembly, a control assembly, a transmission assembly, and a sewage draining switching assembly;

[0007] The driving motor assembly includes a driving motor, the driving motor is fixed to the machine head, and an assembly cavity corresponding to the output shaft of the driving motor is provided at the top of the machine head;

[0008] The control assembly includes a first limit switch and a sewage draining switch located below the first limit switch, and is fixed to the side of the machine head;

[0009] The transmission assembly includes a transmission shaft inserted into the filtering mechanism. The transmission shaft can rotate relative to the assembly cavity and is connected to the output shaft of the driving motor. The sewage draining switching assembly is disposed at the end of the transmission shaft;

[0010] The sewage draining switching assembly includes a sewage draining plug. The sewage draining plug includes a connecting portion and a functional portion, and is connected to the transmission portion through the connecting portion. At least the lower end of the functional portion is provided with a sewage draining plug sealing ring. The sewage draining channel can be opened or closed through the cooperation of the sewage draining plug sealing ring, the functional portion, and the sewage draining member;

[0011] The backwashing mechanism includes a backwashing filter screen and a backwashing framework. The backwashing framework is connected to the transmission shaft and can move axially or equally synchronously. When it runs to the sewage draining switch position, the backwashing filter screen is opened. When it leaves the sewage draining switch position and returns to the first limit switch position, the backwashing filter screen is closed;

[0012] Preferably, the driving motor, the first limit switch, and the sewage draining switch are all electrically connected to the controller.

[0013] The control assembly further includes a second limit switch, which is located below the sewage draining switch;

[0014] The backwashing framework is provided with a valve plug, and the valve plug can close or open the inlet channel of the filtering mechanism along with the movement of the backwashing framework;

[0015] When the controller receives the command signal to close the water inlet passage, the controller controls the driving motor to rotate forward, driving the transmission shaft to move downward until it touches the second limit switch and then stops running. The valve plug seals the internal water inlet passage of the filtering mechanism, achieving the closing of the water inlet passage. When the signal command to close the water inlet passage is cancelled or the signal command to open the water inlet passage is received, the controller controls the driving motor to rotate reversely, driving the transmission shaft to move upward until it touches the first limit switch. The valve plug moves upward to reset and open the internal water inlet passage of the filtering mechanism. The drain plug sealing ring of the drain plug seals with the drain assembly, closing the drain passage, achieving the reset. The second limit switch is electrically connected to the controller.

[0016] Preferably, it further includes a flow monitoring mechanism disposed in the water inlet passage and / or the water outlet passage, which is electrically connected to the controller. The flow monitoring mechanism is any one of a Hall flow sensor, an electromagnetic flow sensor, a vortex street flow sensor, an ultrasonic flow sensor, and an impeller flow sensor.

[0017] Preferably, the flow monitoring mechanism is an ultrasonic monitoring mechanism. The installation axis of the ultrasonic monitoring mechanism is perpendicular to or at an angle to the water inlet flow direction. The ultrasonic monitoring mechanism is a pair of ultrasonic sensors fixedly installed on the machine head and oppositely arranged.

[0018] Preferably, the ultrasonic sensor is provided with a drainage structure along the installation axis direction. One end of the drainage structure is connected to the water inlet passage, and the other end communicates with the inner cavity of the pre-filter. Ensure that there is a certain length of water flow passing through the axis direction of the pair of ultrasonic sensors to ensure the flow detection accuracy.

[0019] Preferably, the installation axis of the ultrasonic monitoring mechanism is perpendicular to the water inlet flow direction. The water inlet passage is provided with a pair of assembly holes, and the ultrasonic sensor is detachably fixed in the assembly holes.

[0020] Preferably, the detachable structure includes a fixing member and an ultrasonic sensor gasket. After the ultrasonic sensor and the ultrasonic sensor gasket are combined, they are disposed in the assembly hole and locked and fixed by the fixing member. The assembly hole is an external thread hole, and the fixing member is a locking nut, and the ultrasonic sensor is locked and fixed by screwing. Or the fixing member is a pressing plate. After the ultrasonic sensor and the ultrasonic sensor gasket are combined, they are disposed in the assembly hole and fixed by the pressing plate. The pressing plate and the assembly hole are fixed by any one of welding, clamping, and screwing.

[0021] Preferably, the filtering mechanism is a stacked filter mechanism, including filter stack plates and a stack plate skeleton. The end of the stack plate skeleton is provided with a stack plate skeleton end cover and a stack plate skeleton end cover gasket. The filter stack plates are sleeved on the stack plate skeleton and can axially slide relative to the stack plate skeleton.

[0022] Preferably, a skeleton sewage discharge cover is provided at the end of the laminated skeleton. The skeleton sewage discharge cover is provided with a number of sewage discharge holes, and a skeleton sewage discharge cover gasket is provided circumferentially on the skeleton sewage discharge cover. The laminated skeleton end cover, the laminated skeleton end cover gasket and the skeleton sewage discharge cover are in sealing cooperation. The skeleton sewage discharge cover and the filter bottle are in sliding sealing cooperation through the skeleton sewage discharge cover gasket. An elastic reset element is provided at the bottom of the skeleton sewage discharge cover, and both ends of the elastic reset element are respectively abutted against the filter bottle and the skeleton sewage discharge cover. In the open state of the sewage discharge channel, the skeleton sewage discharge cover sinks under the action of negative pressure, and the sewage discharge port between the skeleton sewage discharge cover and the laminated skeleton increases accordingly. The elastic reset element is compressed, and the filter laminations are loosened for sewage discharge.

[0023] Preferably, the part of the valve plug protruding circumferentially from the valve plug constitutes a sealing part. A diversion cover is provided in the water inlet channel of the filtering mechanism. A adapter is provided in the diversion cover. The diversion cover is provided with a raw water inlet communicating with the water inlet channel. The shape of the sealing part is adapted to the shape of the diversion cover, and can close and open the raw water inlet, thereby closing and opening the water inlet channel of the filtering mechanism. The adapter is communicated with the water outlet channel. The lower end of the adapter is sealed with the valve plug and is in sliding sealing with the machine head through an adapter seal ring.

[0024] Preferably, a gland and a buffer spring are provided at the top of the backwashing skeleton. Both ends of the buffer spring are respectively pressed against the gland and the backwashing skeleton. The gland abuts against the transmission shaft under the pressure of the buffer spring. In the sewage discharge state, the valve plug is separated from the adapter, and the backwashing channel is opened. During the valve closing operation, the gland drives the adapter to press down and seal with the valve plug. An upper gasket is provided at the upper end of the backwashing filter mesh. The backwashing skeleton is provided with a backspray lower gasket, a water sealing upper gasket and a water sealing lower gasket, which are in relative sealing with the laminated skeleton in the backwashing state to form a sealed cavity and form a jet water flow to wash the filter laminations.

[0025] Preferably, the transmission shaft includes a lifting shaft and a transmission rod. The lifting shaft is provided with an external thread, and the assembly cavity is provided with an internal thread. The lifting shaft is screwed with the transmission rod. The drive motor is provided with a drive motor output shaft, and the drive motor output shaft is detachably connected to the lifting shaft. The lifting shaft has three positions. The uppermost position is the normal filtering state, the middle position is the sewage discharge state, and the lowermost position is the valve closing state. The upper and lower positions are limited by limit switches, and the middle position is controlled by controlling the motion state or time of the drive motor, or each position uses a photoelectric switch, or a magnetic control switch method is used for position control.

[0026] Preferably, the lifting shaft is sleeved with the transmission rod and is provided with a clamp assembly port, which is fixed by an axle clamp; the end of the lifting shaft is provided with a special-shaped hole, and the end of the drive motor output shaft is provided with a matching special-shaped part, and is connected through the cooperation of the special-shaped hole and the special-shaped part.

[0027] Preferably, a washing component is also provided inside the filtering mechanism and sleeved on the transmission shaft. The washing component includes a washing framework, on which a washing part is arranged. The washing part abuts against the inside of the filtering laminations, and the lamination framework forms the washing framework. A relatively sealed cavity is formed between the backwashing mechanism and the lamination framework. The lamination framework is provided with a spraying orifice, and water flows out from the spraying orifice to wash the filtering laminations in the backwashing state.

[0028] The beneficial effects of the present utility model are as follows: the structure of the water leakage monitoring mechanism is more optimized, and it is convenient for installation, use and maintenance, not easy to cause faults, with a compact structure, safe and reliable; the structure of the pre-filter is more optimized, and it is convenient for installation, use and maintenance, not easy to cause faults such as jamming. The pre-filter has a full-automatic sewage discharge function, and can integrate a backwashing function and a water leakage protection function, and can close the waterway in the water leakage state to realize water leakage monitoring and protection. That is to say, the pre-filter of the present utility model can realize the actions of sewage discharge, washing and water leakage protection valve closing controlled by one motor, with a compact structure, safe and reliable. The ultrasonic sensor is provided with a drainage structure to ensure that a certain length of water flow passes through the axis direction of a pair of ultrasonic sensors, so as to ensure the flow detection accuracy. Description of the Drawings

[0029] Figure 1 is the structural schematic diagram of the present utility model;

[0030] Figure 2 is the structural schematic diagram of the present utility model;

[0031] Figure 3 is the structural schematic diagram of the present utility model;

[0032] Figure 4 is the exploded structural schematic diagram of the present utility model

[0033] Figure 5 is the structural schematic diagram of the present utility model (in the normal water passing state);

[0034] Figure 6 is the structural schematic diagram of the present utility model (in the sewage discharge valve opening state);

[0035] Figure 7 is the structural schematic diagram of the present utility model (in the flow channel valve closing state);

[0036] Figure 8 is the structural schematic diagram of the present utility model.

[0037] In the figure: 1. Screw for driving motor cover, 2. Driving motor cover, 3. Driving motor, 4-1. First limit switch, 4-2. Second limit switch, 5. Limit switch bracket, 6. Photoelectric switch, 7. Screw for mounting base, 8. Output shaft, 9. Output shaft gasket, 10. Snap ring, 11. Mounting base bottom, 12. Mounting base, 13. Screw for pressing plate, 14-1. Pressing plate, 14-2. Locking nut, 15. Ultrasonic sensor, 16. Ultrasonic sensor gasket, 17. Machine head, 18. Lifting shaft, 19. Clamp, 20. Transmission shaft, 21. Gland, 22. Buffer spring, 23. Upper gasket, 24. Backwashing filter screen, 25. Valve plug, 26. Backspraying skeleton, 27. Lower sealing ring, 28. Drain plug, 29. Drain plug sealing ring, 30. Backspraying lower gasket, 31. Upper sealing ring for water sealing, 32. Lower sealing ring for water sealing, 33. Filter bottle, 34. Elastic reset element, 35. Sealing gasket for skeleton drain cover, 36. Skeleton drain cover, 37. Laminated skeleton end cover, 38. Sealing gasket for laminated skeleton end cover, 39. Laminated skeleton, 40. Filtering laminations, 41. Sealing ring for deflector, 42. Deflector, 43. Sealing ring for machine head, 44. Adapter, 45. Sealing ring for adapter, 46. Sealing ring for adapter. Detailed implementation mode

[0038] The technical solution of the present utility model will be further specifically described below through specific embodiments in conjunction with the drawings.

[0039] As Figure 1-8 shown, the full-automatic sewage draining and backwashing pre-filter includes a controller, a machine head 17 with an inlet channel and an outlet channel, a filter bottle 33, and a filtering mechanism (filtering laminations 40) and a backwashing mechanism arranged in the filter bottle 33. The cavity between the filtering mechanism and the filter bottle 33 is the raw water cavity, the inner cavity of the backwashing mechanism is the purified water cavity, a sewage draining cavity is arranged at the bottom of the filter bottle 33, a sewage draining part is arranged in the sewage draining cavity, the sewage draining part is provided with a sewage draining channel, and an electric sewage draining mechanism is further included. The electric sewage draining mechanism includes a driving motor assembly, a control assembly, a transmission assembly and a sewage draining switching assembly;

[0040] The driving motor assembly includes a driving motor 3, the driving motor 3 is fixed to the machine head 17, an assembly cavity corresponding to the output shaft 8 of the driving motor 3 is arranged at the top of the machine head 17, the driving motor 3 is fixed through a mounting base 12, and the mounting base bottom 11, the mounting base screw 7 and the driving motor cover screw 1 cooperate to realize installation and positioning;

[0041] The control assembly includes a first limit switch 4-1 and a sewage draining switch (specifically a photoelectric switch 6), and is fixed to the side surface of the machine head 19 through a limit switch bracket 5;

[0042] The transmission assembly includes a transmission shaft inserted into the filtering mechanism, including a lifting shaft 18 and a transmission shaft 20, which are connected by a clamp 19. The lifting shaft 18 is screwed and fitted with the assembly cavity. The end of the lifting shaft 18 is connected to the output shaft 8 of the driving motor 1 (the accessories include an output shaft gasket 9 and a circlip 10). The sewage switching assembly is arranged at the end of the transmission shaft 20. The sewage switching assembly includes a sewage bolt 28, which includes a connecting part and a functional part. The diameter of the functional part is smaller than that of the connecting part. It is connected to the transmission shaft 20 through the connecting part. At least the lower end of the functional part is provided with a first sealing element (sewage bolt sealing ring 29). The sewage passage can be opened or closed through the cooperation of the first sealing element, the functional part and the sewage part. Additionally, according to needs, a lower sealing ring 27 can also be set on the functional part;

[0043] Under the normal filtering state, the upper end of the lifting shaft 18 abuts against the first limit switch 4-1. In the sewage discharge mode, the driving motor 1 rotates forward, driving the transmission shaft 20 to move axially downward to the sewage switch, and then driving the sewage bolt 28 to move axially downward to open the sewage passage. After the sewage discharge is completed, the driving motor 1 rotates reversely, driving the transmission shaft 20 to move axially upward, and then driving the sewage bolt 28 to move axially upward to close the sewage passage. When the upper end of the lifting shaft 18 reaches the position of the first limit switch 4-1, the driving motor stops rotating and returns to the filtering state;

[0044] The control assembly further includes a second limit switch 4-2, which is located below the first limit switch 4-1;

[0045] The backwashing mechanism includes a backwashing filter screen 24 and a backwashing framework 26. The backwashing framework 26 is connected to the transmission shaft 20 and can move axially synchronously to open or close the backwashing filter screen 24. Specifically, the backwashing framework 26 is sleeved on the transmission shaft 20, the lower end is abutted by the sewage bolt 28, and the upper end is pressed by the buffer spring 22 described later. The buffer spring 22 can drive the backwashing framework 26 to move downward;

[0046] The backwashing framework 26 is provided with a valve plug 25, and the valve plug 25 can close or open the water inlet passage of the filtering mechanism as the backwashing framework 26 moves;

[0047] When the controller receives the command signal to close the water inlet waterway, the controller controls the driving motor 1 to rotate forward, driving the transmission shaft 20 to move downward until it touches the second limit switch 4-2, and then stops running. The valve plug 25 seals the internal water inlet passage of the filtering mechanism to realize the closing of the water inlet waterway. When the signal command to close the water inlet waterway is cancelled or the signal command to open the water inlet waterway is received, the controller controls the driving motor 1 to rotate reversely, driving the transmission shaft 20 to move upward until it touches the first limit switch 4-1. The valve plug 25 moves upward and resets to open the internal water inlet passage of the filtering mechanism. At this time, the first sealing element of the sewage bolt 28 seals with the sewage component to close the sewage passage and realize the reset;

[0048] The driving motor 1, the first limit switch 4-1, the limit switch, and the second limit switch 4-2 are all electrically connected to the controller;

[0049] In this embodiment, a flow monitoring mechanism is further included and is provided in the water inlet channel and / or the water outlet channel and is electrically connected to the controller. The flow monitoring mechanism is any one of a Hall flow sensor, an electromagnetic flow sensor, a vortex street flow sensor, an ultrasonic flow sensor, and an impeller flow sensor.

[0050] Specifically, the flow monitoring mechanism is an ultrasonic monitoring mechanism. The ultrasonic monitoring mechanism is provided in the water inlet channel, and the installation axis is perpendicular to the water inlet flow direction. A pair of assembly holes are provided in the water inlet channel, and the ultrasonic sensor 15 is fixedly installed in the assembly holes in a detachable structure. The ultrasonic sensor is provided with a drainage structure a along the installation axis direction. One end of the drainage structure a is connected to the water inlet channel, and the other end communicates with the inner cavity of the pre-filter.

[0051] Specifically, the detachable structure includes a fixing member and an ultrasonic sensor gasket 16. The ultrasonic sensor 15 and the ultrasonic sensor gasket 16 are combined and then arranged in the assembly holes, and are locked and fixed by the fixing member. The assembly holes are external thread holes, and the fixing member is a locking nut 14-2. The ultrasonic sensor 15 is fixed by screwing the locking nut 14-2; or the fixing member is a pressing plate 14-1. The ultrasonic sensor 15 and the ultrasonic sensor gasket 16 are combined and then arranged in the assembly holes, and are fixed by the pressing plate 14-1. The pressing plate 14-1 and the assembly holes are fixed by any one of welding, clamping, and screwing. In this embodiment, screwing is selected and fixed by a screw 13.

[0052] Specifically, the filtering mechanism is a laminated filtering mechanism, including a filtering laminate 40 and a laminate skeleton 39. The end of the laminate skeleton 39 is provided with a laminate skeleton end cover 37 and a laminate skeleton end cover gasket 38. The filtering laminate 40 is sleeved on the laminate skeleton 39 and can axially slide relative to the laminate skeleton 39.

[0053] More specifically, a skeleton sewage discharge cover 36 is provided at the end of the laminated skeleton 39. The skeleton sewage discharge cover 36 is provided with a number of sewage discharge holes. A skeleton sewage discharge cover gasket 35 is provided circumferentially on the skeleton sewage discharge cover 36. The laminated skeleton end cover 37, the laminated skeleton end cover gasket 35 and the skeleton sewage discharge cover 36 are in sealed cooperation. The skeleton sewage discharge cover 36 and the filter bottle 33 are in sliding sealed cooperation through the skeleton sewage discharge cover gasket 35. An elastic reset element 34 is provided at the bottom of the skeleton sewage discharge cover 36. The two ends of the elastic reset element 34 are respectively abutted against the filter bottle 33 and the skeleton sewage discharge cover 36. In the open state of the sewage discharge channel, the skeleton sewage discharge cover 36 sinks under the action of negative pressure, and the sewage discharge port between the skeleton sewage discharge cover 36 and the laminated skeleton 39 increases accordingly. The elastic reset element 34 is compressed, and the filter laminations 40 are loosened for sewage discharge. In this embodiment, the part of the valve plug 25 protruding circumferentially forms a sealing part. A flow guide cover 42 is provided in the water inlet channel of the filtering mechanism. The flow guide cover 42 is provided with a flow guide cover sealing ring 41, and a machine head sealing ring 43 is provided between the flow guide cover 42 and the machine head 17. A adapter 44 is provided inside the flow guide cover 42. The flow guide cover 42 is provided with a raw water port communicating with the water inlet channel. The shape of the sealing part is adapted to the shape of the flow guide cover 42, and can close and open the raw water port, and thus close and open the water inlet channel of the filtering mechanism. The adapter 44 communicates with the water outlet channel. The lower end of the adapter 44 is sealed with the valve plug 25, and is sealed with the machine head 17 through an adapter sealing ring 45. At the top of the backwash skeleton 26, there is a gland 21 and a buffer spring 22. The gland 21 is abutted against the transmission shaft 20 under the pressure of the buffer spring 22. In the sewage discharge state, the valve plug 25 is separated from the adapter 44 to open the backwash channel. When the valve is closed, the gland 21 drives the adapter 44 to press down and seal with the valve plug 25. An upper sealing ring 23 is provided on the backwash filter screen 24, and a lower sealing ring 27 is provided on the backwash skeleton 26. In addition, the backwash skeleton 26 is also provided with a suitable backspray lower sealing gasket 30, a water sealing upper sealing ring 31, a water sealing lower sealing ring 32, all of which are made of silica gel material.

[0054] Specifically, the lifting shaft 18 is provided with an external thread, and the assembly cavity is provided with an internal thread. The lifting shaft 18 is detachably connected to the transmission shaft 20. The drive motor 1 is provided with an output shaft 8, and the output shaft 8 is detachably connected to the lifting shaft 18. The lifting shaft 18 has three positions. The uppermost position is the normal filtering state, the middle position is the sewage discharge state, and the lowermost position is the valve closing state. The upper and lower positions are limited by limit switches, and the middle position is controlled by controlling the motion state or time of the drive motor, or each position is provided with a photoelectric switch 6, or a magnetic control switch method is used for position control.

[0055] In this embodiment, the lifting shaft 18 is sleeved on the transmission shaft 20 and is provided with a clamp 19 assembly port and is fixed by the clamp 19. The end of the lifting shaft 18 is provided with a special-shaped hole, and the end of the output shaft 8 is provided with a suitable special-shaped part, and they are connected through the cooperation of the special-shaped hole and the special-shaped part.

[0056] In this embodiment, inside the filtering mechanism (filter stack 40), sleeved on the transmission shaft 20, there is also a scraping and washing assembly. The scraping and washing assembly includes a scraping and washing framework, and a scraping and washing part is arranged on the scraping and washing framework. The scraping and washing part is in contact with the inside of the filter stack 40. The stack framework 39 forms the scraping and washing framework. A relatively sealed cavity is formed between the backwashing mechanism and the stack framework 39. The stack framework 39 is provided with a jet orifice, and water flows out from the jet orifice to wash the filter stack 40 in the backwashing state.

[0057] The structure of the water leakage monitoring mechanism is more optimized, and it is not easy to cause failures in terms of installation, use, and maintenance. The structure is compact, safe, and reliable; the structure of the pre-filter is more optimized, and it is not easy to cause failures such as jamming in terms of installation, use, and maintenance. The pre-filter has a fully automatic sewage discharge function, and can also integrate a backwashing function and a water leakage protection function, and can close the water circuit in the water leakage state to achieve water leakage monitoring and protection. That is to say, the pre-filter of the present invention can realize the sewage discharge, scraping and washing, and water leakage protection valve closing actions controlled by one motor, with a compact structure, safe, and reliable. The ultrasonic sensor is provided with a drainage structure to ensure that a certain length of water flow passes through the axis direction of a pair of ultrasonic sensors to ensure the flow detection accuracy.

[0058] The above-described embodiments are only a preferred solution of the present invention, and do not impose any form of limitation on the present invention. There are other variations and modifications without exceeding the technical solutions recorded in the claims. For example, a command to close the water inlet circuit, cancel the closing of the water inlet circuit, or open the water inlet circuit is sent to the controller manually, and after the controller responds, a running command is sent to the drive motor 1.

Claims

1. A fully automatic sewage discharge backwashing pre-filter, comprising a controller, a machine head (17) with a water inlet channel and a water outlet channel, a filter bottle (33), and a filtering and backwashing mechanism arranged in the filter bottle (33), wherein the filtering and backwashing mechanism comprises a coaxially arranged filtering structure and a backwashing mechanism, wherein the inner cavity of the backwashing mechanism is a clean water cavity, and the cavity between the filtering mechanism and the filter bottle (33) is a raw water cavity, and a sewage discharge cavity is arranged at the bottom of the filter bottle (33), and a sewage discharge member is arranged in the sewage discharge cavity, and the sewage discharge member is provided with a sewage discharge channel, wherein the characteristics are as follows: Also included is an electric sewage discharge mechanism, the electric sewage discharge mechanism comprising a drive motor (3) component, a control component, a transmission component and a sewage discharge switching component; The drive motor (3) assembly comprises a drive motor (3), the drive motor (3) being fixed to the machine head (17), and a mounting cavity corresponding to an output shaft (8) of the drive motor (3) being provided on the top of the machine head (17); The control assembly comprises a first limit switch (4-1) and a sewage discharge switch located below the first limit switch (4-1), and is fixed to a side of the machine head (17); The transmission assembly comprises a transmission shaft (20) inserted into the filtering and backwashing mechanism, the transmission shaft (20) and the assembly cavity are relatively rotatable and connected to the output shaft (8) of the driving motor (3), and the sewage discharge switching assembly is arranged at the end of the transmission shaft (20); The sewage discharge switching assembly comprises a sewage discharge plug (28), wherein the sewage discharge plug (28) comprises a connecting portion and a functional portion, and is connected to the transmission portion via the connecting portion; a sewage discharge plug sealing ring (29) is provided at least at the lower end of the functional portion; and the sewage discharge passage can be opened or closed by the cooperation of the sewage discharge plug sealing ring (29), the functional portion and the sewage discharge member; In a normal filtering state, the upper end of the lifting shaft (18) abuts against the first limit switch (4-1); in a sewage discharge mode, the drive motor (3) rotates forward, drives the transmission shaft (20) to move axially downward, and then drives the sewage discharge plug (28) to move axially downward until it reaches the sewage discharge switch position, thereby opening the sewage discharge channel; after sewage discharge is completed, the drive motor (3) rotates in the reverse direction, drives the transmission shaft (20) to move axially upward, and then drives the sewage discharge plug (28) to move axially upward, thereby closing the sewage discharge channel; when the upper end of the lifting shaft (18) reaches the position of the first limit switch (4-1), the drive motor (3) stops rotating and returns to the filtering state; The backwashing mechanism comprises a backwashing filter (24) and a backwashing frame (26); the backwashing frame (26) is connected to the transmission shaft (20) and is capable of synchronous or relative axial movement; when the backwashing frame moves to the sewage discharge switch position, the backwashing filter (24) is opened; when the backwashing frame leaves the sewage discharge switch position and returns to the first limit switch, the backwashing filter (24) is closed; The drive motor (3), the first limit switch (4-1), and the sewage discharge switch are all electrically connected to the controller.

2. The fully automatic sewage backwashing pre-filter according to claim 1 is characterized in that: The control assembly further comprises a second limit switch (4-2) located below the sewage discharge switch; The backwashing frame (26) is provided with a valve plug (25), and the valve plug (25) can close or open the water inlet channel of the filter mechanism as the backwashing frame (26) moves; When the controller receives a command signal for closing the water inlet passage, the controller controls the drive motor (3) to rotate forward, driving the transmission shaft (20) to move downward until it contacts the second limit switch (4-2), stops running, and the valve plug (25) is sealed with the internal water inlet passage of the filter mechanism, thereby closing the water inlet passage; when the signal command for closing the water inlet passage is cancelled or a signal command for opening the water inlet passage is received, the controller controls the drive motor (3) to rotate reversely, driving the transmission shaft (20) to move upward until it contacts the first limit switch (4-1), the valve plug (25) moves upward to reset and open the internal water inlet passage of the filter mechanism, the sewage plug sealing ring (29) of the sewage plug (28) is sealed with the sewage discharge assembly, the sewage discharge passage is closed, and reset is achieved; the second limit switch (4-2) is electrically connected to the controller.

3. The fully automatic sewage backwashing pre-filter according to claim 1 or 2, characterized in that: It also includes a flow monitoring mechanism arranged in the water inlet channel and / or the water outlet channel, and the flow monitoring mechanism is any one of a Hall flow sensor, an electromagnetic flow sensor, a vortex flow sensor, an ultrasonic flow sensor and an impeller flow sensor.

4. The fully automatic sewage backwashing pre-filter according to claim 3 is characterized by: The flow monitoring mechanism is an ultrasonic monitoring mechanism, and the installation axis of the ultrasonic monitoring mechanism is perpendicular to or at an angle to the direction of the incoming water flow; the ultrasonic monitoring mechanism is a pair of ultrasonic sensors fixed to the machine head and arranged oppositely.

5. The fully automatic sewage backwashing pre-filter according to claim 4 is characterized in that: The ultrasonic sensor is provided with a drainage structure along the installation axis direction, one end of the drainage structure is connected to the water inlet channel, and the other end is connected to the inner cavity of the pre-filter.

6. The fully automatic sewage backwashing pre-filter according to claim 4 is characterized in that: The installation axis of the ultrasonic monitoring mechanism is perpendicular to the direction of the inlet water flow. The inlet channel is provided with a pair of assembly holes, and the detachable structure of the ultrasonic sensor is fixed in the assembly holes.

7. The fully automatic sewage backwashing pre-filter according to claim 6 is characterized by: The detachable structure comprises a fixing piece and an ultrasonic sensor gasket (16); the ultrasonic sensor (15) and the ultrasonic sensor gasket (16) are combined and arranged in an assembly hole and fixed by means of a fixing piece, the assembly hole is an external threaded hole, the fixing piece is a locking nut (14-2), and the ultrasonic sensor (15) is fixed by means of screw connection and locking; or the fixing piece is a pressing plate (14-1); the ultrasonic sensor (15) and the ultrasonic sensor gasket (16) are combined and arranged in the assembly hole and fixed by means of a pressing plate (14-1); the pressing plate (14-1) and the assembly hole are fixed by means of any one of welding, clamping, and screwing.

8. The fully automatic sewage backwashing pre-filter according to claim 1 or 2, characterized in that: The filtering mechanism is a laminated filtering mechanism, comprising a filtering laminate (40) and a laminated frame (39); a laminated frame end cover (37) and a laminated frame end cover sealing gasket (38) are provided at the end of the laminated frame (39); the filtering laminate (40) is sleeved on the laminated frame (39) and can slide axially relative to the laminated frame (39).

9. The fully automatic sewage backwashing pre-filter according to claim 8 is characterized in that: A skeleton drain cover (36) is provided at the end of the laminated frame (39), the skeleton drain cover (36) is provided with a plurality of drain holes, a skeleton drain cover sealing gasket (35) is provided around the skeleton drain cover (36), the laminated frame end cover (37), the laminated frame end cover sealing gasket (38) and the skeleton drain cover (36) are sealed, the skeleton drain cover (36) and the filter bottle (33) are slidably sealed via the skeleton drain cover sealing gasket (35), an elastic reset element (34) is provided at the bottom of the skeleton drain cover (36), the two ends of the elastic reset element (34) are respectively in contact with the filter bottle (33) and the skeleton drain cover (36), when the drain channel is open, the skeleton drain cover (36) sinks under the action of negative pressure, the drain opening between the skeleton drain cover and the laminated frame (39) is enlarged, the elastic reset element (34) is compressed, and the filter laminate (40) is released to drain.

10. The fully automatic sewage backwashing pre-filter according to claim 2 is characterized in that: The portion of the valve plug (25) protruding from the valve plug (25) in the circumferential direction constitutes a sealing portion. The water inlet channel of the filtering mechanism is provided with a flow guide cover (42). An adapter (44) is provided in the flow guide cover (42). The flow guide cover (42) is provided with a raw water inlet connected to the water inlet channel. The shape of the sealing portion is adapted to the shape of the flow guide cover (42) and can close and open the raw water inlet, thereby closing and opening the water inlet channel of the filtering mechanism. The adapter (44) is connected to the water outlet channel. The lower end of the adapter (44) is sealed with the valve plug (25), and is slidably sealed with the machine head (17) through the adapter sealing ring (45).

11. The fully automatic sewage backwashing pre-filter according to claim 1 or 2, characterized in that: The top of the backwashing frame (26) is provided with a gland (21) and a buffer spring (22). The two ends of the buffer spring (22) respectively press the gland (21) and the backwashing frame (26). The gland (21) is pressed against the transmission shaft (20) by the pressure of the buffer spring (22). In the sewage discharge state, the valve plug (25) is separated from the adapter (44) to open the backwashing channel. When the valve is closed, the gland (21) drives the adapter (44) to press down and seal with the valve plug (25). The upper end of the backwashing filter (24) is provided with an upper sealing gasket (23). The backwashing frame (26) is provided with a backwashing lower sealing gasket (30), a water sealing upper sealing ring (31), and a water sealing lower sealing ring (32). In the backwashing state, it is relatively sealed with the laminated frame (39) to form a sealed cavity, and a jet of water is formed to flush the filter laminated sheets.

12. The fully automatic sewage backwashing pre-filter according to claim 1 or 2, characterized in that: The transmission shaft (20) comprises a lifting shaft and a transmission rod, the lifting shaft is provided with an external thread, the assembly cavity is provided with an internal thread, the lifting shaft is threadedly connected to the transmission rod, the drive motor (3) is provided with a drive motor (3) output shaft (8), the drive motor (3) output shaft (8) is detachably connected to the lifting shaft, the lifting shaft has three positions, the uppermost position is a normal filtering state, the middle position is a sewage discharge state, and the lowermost position is a valve closing state, the upper and lower positions are limited by limit switches, the middle position is controlled by controlling the movement state or time of the drive motor (3), or each position is controlled by a photoelectric switch (6), or by a magnetic control switch.

13. The fully automatic sewage backwashing pre-filter according to claim 12, characterized in that: The lifting shaft is sleeved with the transmission rod and is provided with a clamp assembly opening and is fixed by a clamp (19); a shaped hole is provided at the end of the lifting shaft, and an adaptable shaped portion is provided at the end of the output shaft (8) of the drive motor (3), and is connected with the shaped portion through the matching of the shaped hole and the shaped portion.

14. The fully automatic sewage backwashing pre-filter according to claim 1 or 2, characterized in that: Located in the filter mechanism and sleeved on the transmission shaft (20), a scraping assembly is also provided, the scraping assembly comprising a scraping frame, a scraping portion is provided on the scraping frame, the scraping portion abuts against the inside of the filter stack (40), the stack frame (39) constitutes the scraping frame, a relatively sealed cavity is formed between the backwashing mechanism and the stack frame (39), the stack frame (39) is provided with a jet port, and water is sprayed out from the jet port to wash the filter stack (40) in the backwashing state.

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