WO2018011013A1

WO2018011013A1 - Upstream filter

Info

Publication number: WO2018011013A1
Application number: PCT/EP2017/066613
Authority: WO
Inventors: Enhua CHEN; Zhengbo DING; Kaiqin PENG; Ke TU
Original assignee: Zhejiang Qinyuan Water Treatment Technology Co Ltd; Unilever PLC
Current assignee: Zhejiang Qinyuan Water Treatment Technology Co Ltd; Unilever PLC
Priority date: 2016-07-11
Filing date: 2017-07-04
Publication date: 2018-01-18
Anticipated expiration: 2019-01-11
Also published as: CN106039802A; CN106039802B

Abstract

The present invention relates to the field of purification equipment, and discloses filter adapted for use as a pre-filter, comprising a tubular body; a filter core assembly is provided in the tubular body, a pipe passing through the filter core assembly is also provided in the tubular body, the bottom of the pipe is in communication with the interior of the tubular body, the top passes out of the tubular body and is connected to an electrical ball valve, and a dirt discharge port is provided on the electrical ball valve. The filter of the present invention is designed rationally so as to attain better forward flushing and back-flushing effects. The flushing function thereof can be realized through fully automated control. It has advantages such as high efficiency, low cost and strong adaptability.

Description

Upstream filter

Field of the invention

The present invention relates to the field of purification equipment, in particular to an upstream filter which is a filter adapted for use as a pre-filter. Background of the invention

At present, since city water supply pipelines are old and very long, the production pipelines rust. Not only will corrosion of pipelines and impurities such as silt cause brown water and loss of control of appliances which use water, such as dripping from taps and blockage or cracking of heat exchanger pipelines, but impurities will also settle in pipelines, on the one hand providing a hotbed for the growth of bacteria, and on the other hand forming electrochemical substances; these can cause corrosion or a through-hole in a metal pipeline in just a few months. An upstream tap water filter is the first crude filtration device for water for the whole household, and can filter silt, rust and large-particle substances in tap water. It is a reliable impurity filtration apparatus, which restores tap water to the standard which it had before exiting the plant, to protect downstream equipment, and actively protect concealed pipeline, taps and electrical appliances, etc.

Existing pre-filter products generally all lack an automatic back-flushing function; even if a back-flushing function is declared, it will not be capable of attaining any real effect. Essentially, in every case, an incoming water valve and an outgoing water valve are added at a water inlet and a water outlet of a downstream filter core respectively. The realization of the back-flushing function thereof relies principally on a reversed flow of water at the outgoing water valve. Under the water pressure of flushing in such a method, the flushing strength is then small, and it is essentially difficult to attain a back-flushing effect. To increase the back-flushing strength, it is necessary to employ a large driving current, but this will lead to high costs and a considerable safety risk. Summary of the invention

One aspect of the present invention provides a filter adapted for use as a pre-filter, comprising a tubular body; a filter core assembly is provided in the tubular body, a pipe passing through the filter core assembly is also provided in the tubular body, the bottom of the pipe is in communication with the interior of the tubular body, the top passes out of the tubular body and is connected to an electrical ball valve, and a dirt discharge port is provided on the electrical ball valve.

Another aspect of the present invention provides use of the filter of first aspect for back flushing. Brief Description of Drawings

Fig. 1 is an exploded structural drawing of first aspect of the present invention.

Fig. 2 is a drawing of the state of the present invention during normal filtration.

Fig. 3 is a drawing of the state of the present invention during forward flushing.

Fig. 4 is a drawing of the state of the present invention during back-flushing.

Fig. 5 is a sectional drawing of the present invention when in a flushing state.

The references of the parts represented by numerals in the drawings are as follows: 1 - tubular body; 2 - filter core assembly; 3 - pipe; 4 - electrical ball valve; 5 - valve head seat; 6 - water inlet & outlet; 7 - lifting mechanism; 8 - control panel cover; 1 1 - sealing sleeve; 21 - protruding ring; 22 - back-flushing port; 23 - central sleeve; 24 - sealing plug; 25 - filter mesh assembly; 26 - filter mesh framework; 231 - vane wheel; 232 - protruding rib; 41 - dirt discharge port; 51 - inner channel; 52 - outer channel; 81 - micro switch; 71 - motor support; 72 - motor; 73 - eccentric wheel; 74 - connecting rod; 75 - moving rod.

Detailed description of the invention In response to the problem affecting pre-filters in the prior art, namely a poor back- flushing function, the present invention provides a pre-filter. To solve the abovementioned technical problem, the present invention employs the following technical solution:

A filter adapted for use as a pre-filter, comprising a tubular body, with a filter core assembly being provided in the tubular body; a pipe passing through the filter core assembly is also provided in the tubular body, the bottom of the pipe is in communication with the interior of the tubular body, the top passes out of the tubular body and is connected to an electrical ball valve, and a dirt discharge port is provided on the electrical ball valve. By providing a pipe in the tubular body to discharge dirt, secondary deposition on the filter core assembly during dirt discharge in a conventional pre-filter, caused by the fact that the channel for discharging dirt after flushing therein is not isolated from the filter core assembly, can be avoided. At the same time, since the dirt discharge pipeline in a conventional filter is always disposed at the bottom of the filter, deposition of impurities and blockage at the bottom of the filter may result after a long period of use, seriously affecting the flushing result, whereas when the dirt discharge port is disposed at the top of the filter, under the action of the electrical ball valve, after flushing is drawn out from the bottom to the top, and under the action of gravity, deposition of impurities and blockage at the dirt discharge port can be effectively reduced.

Preferably, the internal diameter of the pipe is 1 to 10 cm. Pipes of different internal diameters can eliminate impurities of different particle sizes, and in order to make the overall volume of the pre-filter, the diameter of the pipe is reduced, on condition that the flushing result is not affected, as far as possible.

Preferably, a sealing sleeve is fixed to an inside wall of the tubular body, a protruding ring capable of mating with the sealing sleeve in a sealed manner is provided on the filter core assembly, and a back-flushing port in communication with the interior of the filter core assembly is also provided on the filter core assembly.

Preferably, a top end of the tubular body is connected to a valve head seat, in which valve head seat are provided an inner channel and an outer channel; the filter core assembly is inserted into the inner channel of the valve head seat and can move up and down in the inner channel; when the sealing sleeve and protruding ring are separated from each other, the back-flushing port is cut off by a sidewall of the inner channel, and when the sealing sleeve forms a seal with the protruding ring, the back- flushing port establishes communication between the outer channel and the interior of the filter core assembly. Switching between forward flushing and back-flushing of the filter is achieved through separation of the sealing sleeve and the protruding ring and tight contact therebetween and through the opening/closing of the back-flushing port.

Preferably, a water inlet & outlet is connected to the valve head seat; a flow meter and a pressure gauge, for measuring flow rate and water pressure respectively, are provided on the water inlet & outlet. Through the provision of a flow meter and a pressure gauge etc. to measure water pressure and flow rate, the effect of too high a water pressure or an unstable water pressure on the filtration effect of the pre-filter is avoided, and the operational stability thereof is increased. A smart reminder can be provided to a user that water pressure is too high so a function such as a pressure reducing valve must be installed.

Preferably, also included is a lifting mechanism for moving the filter core assembly up and down along the pipe; the lifting mechanism comprises a motor support, a motor is provided on the motor support, an eccentric wheel is connected to a motor shaft of the motor, and a moving rod is connected to the eccentric wheel by means of a connecting rod; that end of the moving rod which is remote from the connecting rod is fixed to the filter core assembly. Raising or lowering of the filter core assembly is realized by means of the lifting mechanism, so as to control separation of the sealing sleeve and the protruding ring and tight contact therebetween and the opening/closing of the back- flushing port, to realize switching between forward flushing and back-flushing of the filter.

Preferably, a central sleeve capable of rotating freely around the pipe is provided in the filter core assembly; a vane wheel and a protruding rib are provided inside and outside the central sleeve respectively, and a water outlet in communication with the interior of the central sleeve is provided on the protruding rib. The central sleeve is disposed in the filter core assembly, such that the central sleeve rotates around the pipe under the action of the impulsive force of back-flushing water, and a fan-shaped concentrated flow rate is presented to flush the filter mesh assembly, increasing the impulsive force of the water flow to the maximum extent, and optimizing the back-flushing capacity.

Preferably, also included is an electronic control system, which comprises a flushing module and a micro switch; the flushing module is connected to both the micro switch and the electrical ball valve; the micro switch is used for detecting a flushing signal and transmitting the detected signal to the flushing module; the flushing module controls the electrical ball valve to perform flushing according to the flushing signal received. By providing the electronic control system, fully automatic control of filter flushing can be realized, with no need for manual operation, effectively improving the filter efficiency.

Preferably, there are two micro switches, located at the top and bottom sides of the eccentric wheel respectively; when the eccentric wheel rotates to the highest point and lowest point, it can trigger the micro switches on the top and bottom sides respectively; moreover, when the eccentric wheel rotates to the highest point, the sealing sleeve and the protruding ring are separated; when the eccentric wheel rotates to the lowest point, the sealing sleeve forms a seal with the protruding ring.

Preferably, a control panel cover installed above the valve head seat is also included; a control panel is provided on the control panel cover; buttons for controlling a time setting module and a flushing module are provided on the control panel; operating modes are selected, and the period, time and water usage of back-flushing are set, by pressing corresponding buttons on the control panel. By controlling the time setting module and flushing module, the period, time and water usage etc. of back-flushing may be set and adjusted by oneself, effectively preventing normal use from being affected during flushing, while the filtration and purification effect of the pre-filter can be ensured.

Preferably, a communication module is also provided on the control panel; the communication module is connected by wireless network to a mobile phone client, the mobile phone client being used to control the time setting module and the flushing module. By means of a communication module, it is possible to acquire a pressure reading on a smart mobile phone, and set an alarm function for excessively high water pressure; it is also possible to realize smart flushing and water usage summation by means of a flow meter reading, to truly achieve manual smart fully automatic flushing.

Through the adoption of the technical solution above, the present invention has marked technical effects:

The pre-filter of the present invention is designed rationally so as to attain better forward flushing and back-flushing effects. The flushing function thereof can be realized through fully automated control. It has advantages such as high efficiency, low cost and strong adaptability. The present invention provides a filter adapted for use as a pre-filter, the filter comprising a tubular body; a filter core assembly is provided in the tubular body, a pipe passing through the filter core assembly is also provided in the tubular body, the bottom of the pipe is in communication with the interior of the tubular body, the top passes out of the tubular body and is connected to an electrical ball valve, and a dirt discharge port is provided on the electrical ball valve.

It is preferred that the filter further comprises a sealing sleeve fixed to an inside wall of the tubular body, a protruding ring capable of mating with the sealing sleeve in a sealed manner is provided on the filter core assembly, and a back-flushing port in communication with the interior of the filter core assembly is also provided on the filter core assembly.

It is preferred that the top of the tubular body is connected to a valve head seat comprising an electrical ball valve, an inner channel and an outer channel inside of the valve head seat; wherein, one end of the filter core assembly is inserted into the inner channel of the valve head seat and can move up and down in the inner channel; such that when the sealing sleeve and protruding ring are separated from each other, the back-flushing port is cut off by a sidewall of the inner channel, and when the sealing sleeve forms a seal with the protruding ring, the back-flushing port establishes communication between the outer channel and the interior of the filter core assembly . It is preferred that the valve head seat is arranged to have a water inlet & outlet, wherein, the body comprises a flow meter and a pressure gauge, for measuring flow rate and water pressure respectively.

It is preferred that the filter further comprises a lifting means for moving the filter core assembly up and down along the length of pipe .

It is preferred that the lifting means comprises a motor support comprising a motor, an eccentric wheel connected to a motor shaft of the motor, and a moving rod connected to the eccentric wheel by means of a connecting rod; such that end of the moving rod which is remote from the connecting rod is fixed to the filter core assembly . It is preferred that the filter core assembly comprises a central sleeve inside of the filter core assembly, the central sleeve capable of rotating freely around the pipe.

It is preferred that the central sleeve comprises a vane wheel and a protruding rib provided inside and outside the central sleeve respectively, and a water outlet in communication with the interior of the central sleeve is provided on the protruding rib. It is preferred that the filter comprises an electronic control system, which comprises a flushing module and a micro switch; the flushing module is connected to both the micro switch and the electrical ball valve; the micro switch is used for detecting a flushing signal and transmitting the detected signal to the flushing module; the flushing module controls the electrical ball valve to perform flushing according to the flushing signal received.

It is preferred that the eccentric wheel is arranged to have two micro switches, located at the top and bottom sides respectively; such that when the eccentric wheel rotates to the highest point and lowest point, it can trigger the micro switches on the top and bottom sides respectively; when the eccentric wheel rotates to the highest point, the sealing sleeve and the protruding ring are separated; and when the eccentric wheel rotates to the lowest point, the sealing sleeve forms a seal with the protruding ring . It is preferred that the filter comprising a control panel cover installed above the valve head seat; the control panel cover comprising a control panel which comprises buttons for controlling a time setting module and a flushing module such that the operating mode, period, time and amount of water usage for back-flushing may be set by operating corresponding buttons.

It is preferred that the control panel further comprises a communication module which is configured to be connected by wireless network to a mobile phone client, such that the mobile phone client is able to control the time setting module and the flushing module. The present invention provides use of the filter of the present invention for back flushing.

The present invention is described in further detail below in conjunction with the accompanying drawings and embodiments.

The present invention provides a filter, the filter comprises a tubular body 1 ; a filter core assembly 2 is provided in the tubular body 1 , a pipe 3 passing through the filter core assembly 2 is also provided in the tubular body 1 , the bottom of the pipe 3 is in communication with the interior of the tubular body 1 , the top passes out of the tubular body 1 and is connected to an electrical ball valve 4, and a dirt discharge port 41 is provided on the electrical ball valve 4. The internal diameter of the pipe is 1 cm. It is preferred that a control panel cover 8 is installed above a valve head seat 5, wherein the electrical ball valve 4 is fixed in the control panel cover 8 and the dirt discharge port 41 extends out of the control panel cover 8. A control panel is provided on the control panel cover 8; buttons for controlling a time setting module and a flushing module are provided on the control panel. Operating modes are selected, and the period, time and water usage of back-flushing are set, by pressing corresponding buttons on the control panel. A communication module is also provided on the control panel; the communication module is connected by wireless network to a mobile phone client, the mobile phone client being used to control the time setting module and the flushing module. The filter core assembly 2 comprises a sealing plug 24 and a filter mesh assembly 25 connected to the sealing plug 24. The filter mesh assembly 25 comprises a filter mesh framework 26 and a filter mesh surrounding the filter mesh framework 26. The filter mesh framework 26 comprises multiple annular framework pieces arranged axially, and a number of connecting pieces which connect all the annular framework pieces, with two adjacent annular framework pieces forming an annular groove. The bottom of the sealing plug 24 has an engaging hook which hooks onto an annular framework piece; the filter mesh framework 26 and sealing plug 24 are connected through mating engagement between the engaging hook and the annular framework piece. The bottom of the filter core assembly 2 is provided with a support rib for supporting; a bottom end of the filter core assembly 2 is supported in the tubular body 1 by the support rib, preventing the filter core assembly 2 from sliding out of the valve head seat 5. A central sleeve 23 capable of rotating freely around the pipe 3 is provided in the filter core assembly 2; a vane wheel 231 and protruding ribs 232 are provided inside and outside the central sleeve 23 respectively, and water outlets in communication with the interior of the central sleeve 23 are provided on the protruding ribs 232.

A sealing sleeve 1 1 is fixed to an inside wall of the tubular body 1. A protruding ring 21 capable of mating with the sealing sleeve 1 1 in a sealed manner is provided on the filter core assembly 2, and a back-flushing port 22 in communication with the interior of the filter core assembly 2 is also provided on the filter core assembly 2. Specifically, the back-flushing port 22 is disposed on the sealing plug 24, and the protruding ring 21 is disposed at the top of the filter mesh assembly 25.

A top end of the tubular body 1 is connected to the valve head seat 5, in which valve head seat 5 are provided an inner channel 51 and an outer channel 52. An end of the filter core assembly 2 is inserted into the inner channel 51 of the valve head seat 5 and can move up and down in the inner channel 51 . When the sealing sleeve 1 1 and protruding ring 21 are separated from each other, the back-flushing port 22 is cut off by a sidewall of the inner channel 51 , and when the sealing sleeve 1 1 forms a seal with the protruding ring 21 , the back-flushing port 22 establishes communication between the outer channel 52 and the interior of the filter core assembly 2. Also included is a lifting mechanism 7 for moving the filter core assembly 2 up and down along the pipe 3; sealing between the sealing sleeve 1 1 and the protruding ring 21 , and separation of the sealing sleeve and the protruding ring, are realized through the up/down movement of the filter core assembly 2. The lifting mechanism 7 comprises a motor support 71 fixed above the valve head seat 5, and the entire lifting mechanism 7 is fixed in the control panel cover 8. A motor 72 is provided on the motor support 71 , an eccentric wheel 73 is connected to a motor shaft of the motor 72, and a moving rod 75 is connected to the eccentric wheel 73 by means of a connecting rod 74; that end of the moving rod 75 which is remote from the connecting rod 74 is fixed to the sealing plug 24 in the filter core assembly 2.

It is preferred that flushing of the pre-filter is controlled automatically. The pre-filter also comprises an electronic control system, which comprises a flushing module and a micro switch 81 . The flushing module is connected to both the micro switch 81 and the electrical ball valve 4. The micro switch 81 is used for detecting a flushing signal and transmitting the detected signal to the flushing module; the flushing module controls the electrical ball valve 4 to perform flushing according to the flushing signal received.

It is preferred that there are two micro switches 81 , located at the top and bottom sides of the eccentric wheel 73 respectively. When the eccentric wheel 73 rotates to the highest point and lowest point, it can trigger the micro switches 81 on the top and bottom sides respectively. Moreover, when the eccentric wheel 73 rotates to the highest point, the sealing sleeve 1 1 and the protruding ring 21 are separated; when the eccentric wheel 73 rotates to the lowest point, the sealing sleeve 1 1 forms a seal with the protruding ring 21 . it is preferred that during normal filtration, a flow of water enters through the outer channel 52 of the valve head seat 5. At this time, the lifting mechanism 7 lifts the moving rod 75 sealing plug 24 upwards by means of the eccentric wheel 73, such that the entire filter core assembly 2 can move upwards along the pipe, so that the sealing sleeve 1 1 and protruding ring 21 are separated. The flow of water flows into a lower part of the filter core assembly 2 through a gap between the sealing sleeve 1 1 and the protruding ring 21 , then enters the filter core through the filter mesh assembly 25 such that impurities etc. are intercepted outside the filter mesh. Having been filtered by the filter mesh assembly 25, the water flows out through the inner channel 51 of the valve head seat 5, and the electrical ball valve 4 remains in a closed state throughout this process. It is preferred that when it is necessary to perform forward flushing, a forward flushing program is initiated. A back-flushing signal is transmitted via a button on the control panel or a mobile phone client; under the action of the motor 72, the eccentric wheel 73 moves to the highest position, and the moving rod 75 pulls up the filter core assembly 2, such that the sealing sleeve 1 1 and the protruding ring 21 are separated. At the same time, the eccentric wheel 73 moves the micro switch 81 above the eccentric wheel 73; the micro switch 81 can then detect the back-flushing signal and transmit the forward flushing signal to the flushing module. The flushing module controls the electrical ball valve 4 to open according to the forward flushing signal received, to perform forward flushing. Specifically, the water flow direction is as follows: the flow of water enters through the outer channel 52 of the valve head seat 5, then flows into the lower part of the filter core assembly 2 through the gap between the sealing sleeve 1 1 and the protruding ring 21 , and during this process flushes the filter core assembly 2. Finally, the flow of water enters the pipe through a water inlet at the bottom of the pipe, and is discharged through the dirt discharge port 41 on the electrical ball valve 4.

It is preferred that when it is necessary to perform back-flushing, a back-flushing program is initiated. A back-flushing signal is transmitted via a button on the control panel or a mobile phone client; under the action of the motor 72, the eccentric wheel 73 moves to the lowest position, and the moving rod 75 pushes down the filter core assembly 2, such that a seal is formed between the sealing sleeve 1 1 and the protruding ring 21. At the same time, the eccentric wheel 73 moves the micro switch 81 below the eccentric wheel 73; the micro switch 81 can then detect the back-flushing signal and transmit the back-flushing signal to the flushing module. The flushing module controls the electrical ball valve 4 to open according to the back-flushing signal received, to perform back-flushing. Specifically, the water flow direction is as follows: flows of water enter the filter core through the inner channel 51 and outer channel 52 of the valve head seat 5 respectively; water in the inner channel 51 flows directly into the interior of the filter core assembly 2, and water in the outer channel 52 flows into the interior of the filter core assembly 2 through the back-flushing port 22, and during this process back-flushes the filter core assembly 2. At the same time, since the central sleeve 23 is disposed in the filter core assembly 2, when the direction of the water path in a filter core main machine is changed, the central sleeve 23 will rotate around the pipe 3 due to the impulsive force of back-flushing water, and a fan-shaped concentrated flow rate is presented to flush the filter mesh, increasing the impulsive force of the water flow to the maximum extent, and optimizing the back-flushing capacity, such that solid impurities can be removed, and flushed away. Finally, the back-flushing water is discharged through the filter mesh assembly 25, enters the central rod through the water inlet at the bottom of the central rod, and is discharged through the dirt discharge port 41 on the electrical ball valve 4. When flushing has ended, the synchronous motor 72 operates, the eccentric wheel 73 moves to the topmost end, and again triggers the micro switch 81 above the eccentric wheel 73, such that the operating state is restored. It is preferred that a restoring spring is also disposed between the sealing sleeve 1 1 and the protruding ring 21 . When it is necessary to lift the filter core assembly 2, a return action on the filter core assembly 2 is triggered, to more efficiently return to the normal operating state of the filter core. It is preferred that a water inlet & outlet 6 is connected to the valve head seat 5. A flow meter and a pressure gauge, for measuring flow rate and water pressure respectively, are provided on the water inlet & outlet 6. By means of communication module, it is possible to acquire a pressure reading on a smart mobile phone, and set an alarm function for excessively high water pressure; it is also possible to realize smart flushing and water usage summation by means of a flow meter reading, and to use a mobile phone terminal at the appropriate time to perform manual flushing or associated setting of a machine. When the overall flow usage of a household is acquired, manual smart fully automatic flushing is truly achieved.

The fully automatic forward/back-flushing function has no need for manual operation, and the time setting module and flushing module can be set by means of a mobile phone client and buttons on the control panel, such that the period, time and water amount etc. of back-flushing can all be adjusted. Such a function for automatic, timed flushing can effectively prevent normal use from being affected. At the same time, periodic forward/back-flushing can also ensure the filtration/purification effect of the pre-filter, and the period and times of forward/back-flushing can be adjusted according to the actual water quality, so there is strong capacity for adaptation.

The present invention also provides that pre-filter is flushed manually. Forward flushing and back-flushing of the pre-filter is controlled by manually controlling the electrical ball valve 4 and the lifting mechanism 7, so that when the automatic flushing function is closed, the manual flushing function is still effective, thereby effectively increasing the flexibility of operation. It is highly preferred that the internal diameter of the pipe is 10 cm.

In summary, the embodiments above are merely preferred embodiments of the present invention. All equivalent changes and modifications made within the patent application scope of the present invention shall be included in the scope of the present invention patent.

Claims

C2353 CPL WO 2018/011013 PCT/EP2017/066613 14 Claims

1. A filter adapted for use as a pre-filter, the filter comprising a tubular body (1 ); a filter core assembly (2) is provided in the tubular body (1 ), a pipe (3) passing through the filter core assembly (2) is also provided in the tubular body (1 ), the bottom of the pipe (3) is in communication with the interior of the tubular body (1 ), the top passes out of the tubular body (1 ) and is connected to an electrical ball valve (4), and a dirt discharge port (41 ) is provided on the electrical ball valve (4).

2. A filter according to claim 1 , wherein the filter further comprises a sealing sleeve (1 1 ) fixed to an inside wall of the tubular body (1 ), a protruding ring (21 ) capable of mating with the sealing sleeve (1 1 ) in a sealed manner is provided on the filter core assembly (2), and a back-flushing port (22) in communication with the interior of the filter core assembly (2) is also provided on the filter core assembly (2).

3. A filter according to claims 1 or 2, wherein the top of the tubular body (1 ) is connected to a valve head seat (5) comprising an electrical ball valve (4), an inner channel (51 ) and an outer channel (52) inside of the valve head seat (5); wherein, one end of the filter core assembly (2) is inserted into the inner channel (51 ) of the valve head seat (5) and can move up and down in the inner channel (51 ); such that when the sealing sleeve (1 1 ) and protruding ring (21 ) are separated from each other, the back- flushing port (22) is cut off by a sidewall of the inner channel (51 ), and when the sealing sleeve (1 1 ) forms a seal with the protruding ring (21 ), the back-flushing port (22) establishes communication between the outer channel (52) and the interior of the filter core assembly (2).

4. A filter according to anyone of the preceding claims 1 to 3, wherein, the valve head seat (5) is arranged to have a water inlet & outlet (6), wherein, the body (6) comprises a flow meter and a pressure gauge, for measuring flow rate and water pressure respectively.

5. A filter according to anyone of the preceding claims 1 to 4, wherein, the filter further comprises a lifting means for moving the filter core assembly (2) up and down along the length of pipe (3). C2353 CPL

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6. A filter according to claim 5, wherein the lifting means (7) comprises a motor support (71 ) comprising a motor (72), an eccentric wheel (73) connected to a motor shaft of the motor (72), and a moving rod (75) connected to the eccentric wheel (73) by means of a connecting rod (74); such that end of the moving rod (75) which is remote from the connecting rod (74) is fixed to the filter core assembly (2).

7. A filter according to anyone of the preceding claims 1 to 6, wherein, the filter core assembly (2) comprises a central sleeve (23) inside of the filter core assembly (2), the central sleeve capable of rotating freely around the pipe (3).

8. A filter according to claim 7, wherein the central sleeve (23) comprises a vane wheel (231 ) and a protruding rib (232) provided inside and outside the central sleeve (23) respectively, and a water outlet in communication with the interior of the central sleeve (23) is provided on the protruding rib (232).

9. A filter according to anyone of the preceding claims 1 to 8, wherein, the filter comprises an electronic control system, which comprises a flushing module and a micro switch (81 ); the flushing module is connected to both the micro switch (81 ) and the electrical ball valve (4); the micro switch (81 ) is used for detecting a flushing signal and transmitting the detected signal to the flushing module; the flushing module controls the electrical ball valve (4) to perform flushing according to the flushing signal received.

10. A filter according to anyone of the preceding claims 6 to 9, wherein the eccentric wheel (73) is arranged to have two micro switches (81 ), located at the top and bottom sides respectively; such that when the eccentric wheel (73) rotates to the highest point and lowest point, it can trigger the micro switches (81 ) on the top and bottom sides respectively; when the eccentric wheel (73) rotates to the highest point, the sealing sleeve (1 1 ) and the protruding ring (21 ) are separated; and when the eccentric wheel (73) rotates to the lowest point, the sealing sleeve (1 1 ) forms a seal with the protruding ring (21 ).

1 1 . A filter according to anyone of claims 3 to 10, the filter comprising a control panel cover (8) installed above the valve head seat (5); the control panel cover (8) C2353 CPL

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comprising a control panel which comprises buttons for controlling a time setting module and a flushing module such that the operating mode, period, time and amount of water usage for back-flushing may be set by operating corresponding buttons.

12. A filter according to claim 1 1 , wherein, the control panel further comprises a communication module which is configured to be connected by wireless network to a mobile phone client, such that the mobile phone client is able to control the time setting module and the flushing module.

13. Use of the filter according to anyone of claims 1 to 12 for back flushing.