CN106964183B

CN106964183B - Back flush filter

Info

Publication number: CN106964183B
Application number: CN201710360090.9A
Authority: CN
Inventors: 吕仁木
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-05-20
Filing date: 2017-05-20
Publication date: 2022-10-25
Anticipated expiration: 2037-05-20
Also published as: CN106964183A

Abstract

The invention provides a backwashing filter, and belongs to the technical field of machinery. It has solved the current not good problem of filter washing effect. It includes the body, the water inlet has on the body, the drain that the delivery port and can open and close, this internal filter core that is the tube-shape that is equipped with, the water inlet and the delivery port of body are linked together through the filter core, be equipped with the washing stick that has the inner chamber in the filter core, set up the soil pick-up mouth that is linked together with the inner chamber that washs the stick on the lateral part that washs the stick, the filter core bottom has the decontamination mouth that is linked together with the drain, it is relative with decontamination mouth to wash stick lower extreme opening, the outside that washs the stick has the atress portion, be equipped with the impeller in the washing stick, and have between the diapire that washs the lower extreme of stick and filter core inner chamber and can support when rivers pass through the impeller and wash the stick and carry out pivoted bearing structure. It has the advantages of strong dirt-absorbing power, good flushing effect, etc.

Description

Back flush filter

Technical Field

The invention belongs to the technical field of machinery, relates to a filter, and particularly relates to a backwashing filter.

Background

With the progress of science and technology and the improvement of living standard of people, people begin to have higher requirements on water and diet health in daily life. At present, more and more people begin to adopt a pre-filter to purify water once so as to filter impurities and the like in a pipe network. The working principle of the pre-filter is generally as follows: tap water is connected into the shell of the pre-filter from the water inlet, and flows out from the water outlet after being filtered by the filter element in the shell for users to use. This is the normal operating condition of leading filter, nevertheless can remain a lot of impurity and jellies on using the filter core after a period, impurity and jellies are difficult to be cleared up generally, all connect the blowoff valve at the casing lower extreme of leading filter at present, open the blowoff valve when needing to clear up, make the blow off pipe and the water inlet intercommunication of blowdown usefulness, make running water flow through from the water inlet, will adhere to impurity on the filter core and wash out and arrange in the blow off pipe through the blowoff valve when the filter core surface.

However, for the jelly adhered on the filter element, the jelly cannot be effectively cleaned from the filter element because the strength of the water flow is not enough by simply adopting the water flow to filter the surface of the filter element. To solve this problem, chinese patent discloses a prefilter [ application No.: 201520252203.X ], the automatic sewage treatment device comprises a connecting part and a filtering part, wherein the connecting part is connected with an external pipeline to pass water, the filtering part is communicated with the connecting part, a drainage ball valve is arranged at the bottom of the filtering part, the filtering part comprises a cylindrical filter screen, a siphon type flushing device is arranged inside the filter screen along the axial direction of the filter screen, the siphon type flushing device comprises a long strip-shaped sewage suction port arranged along the axial direction of the filter screen, a sewage discharge channel is also arranged inside the siphon type flushing device, the sewage suction port is communicated with the sewage discharge channel, and the tail end of the sewage discharge channel is communicated with the ball valve. The long-strip sewage suction port and a sewage discharge channel in the device jointly form a siphon, the sewage suction port is close to the filter screen, negative pressure is generated at the sewage suction port, impurities on the filter screen are continuously sucked into the sewage discharge pipe through suction force generated by siphon action, and the impurities on the filter screen are conveniently cleaned.

Although the prefilter can solve the problem of cleaning jelly, it has some disadvantages: the siphon pipe is rotated by manual operation of people, and the siphon pipe cannot rotate quickly due to the limited rotation speed of the siphon pipe caused by the manual operation, so that although negative pressure is formed at a sewage suction port of the siphon pipe, the generated suction force is not strong. The jelly is very sticky, so that if the generated suction force is insufficient, the jelly attached to the filter element is still difficult to clean. In view of the above situation, the most commonly adopted method is to add a motor as a driving member to drive the siphon tube to rotate rapidly, which can effectively solve the above problems, but also increase the purchase cost of the user, and the motor driving method also increases the use cost of the user.

Disclosure of Invention

The invention aims to provide a backwashing filter aiming at the problems in the prior art, and the technical problem to be solved is how to improve the washing effect.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides a back flush filter, includes the body, has water inlet, delivery port and the drain that can open and close on the body, this internal filter core that is the tube-shape that is equipped with, the water inlet and the delivery port of body are linked together through the filter core, the filter core in be equipped with the washing stick that has the inner chamber, set up the soil pick-up mouth that is linked together with the inner chamber of washing stick on the lateral part of washing stick, filter core bottom the decontamination mouth that is linked together with the drain has, washing stick lower extreme opening and relative with decontamination mouth, the outside of washing stick has the atress portion, a serial communication port, the washing stick in be equipped with the impeller, and have between the diapire of the lower extreme of washing stick and filter core inner chamber and can support when rivers through the impeller and wash the stick and carry out pivoted bearing structure.

The normal filtering process of the backwashing filter is the same as that of the prior art, the drain outlet is controlled to be closed, then water is connected from the water inlet, and finally flows into the water outlet for users to use after being filtered by the filter element. When the filter core is washed to needs, the control drain is opened and is made the direct intercommunication of decontamination mouth of drain and filter core bottom, so, just in fact make the water inlet pass through the filter core, wash the soil pick-up mouth on the stick, wash the inner chamber of stick and the decontamination mouth of filter core bottom and form the intercommunication with the drain, so by the water of water inlet access will directly discharge from the drain.

Because the supporting structure is arranged between the lower end of the cleaning rod and the bottom wall of the inner cavity of the filter element, when water flows through the cleaning rod, the water flow can act on the impeller arranged in the cleaning rod, and therefore the cleaning rod can automatically rotate by taking the supporting structure as a fulcrum. The outside of washing stick has the atress portion, and at the pivoted in-process of washing stick, the atress portion can be stirred the water between washing stick outside and the filter core inner wall. Meanwhile, as the outer side of the cleaning rod is provided with the dirt suction port communicated with the inner cavity of the cleaning rod, the cleaning rod can generate negative pressure at the dirt suction port in the rotating process, namely, the suction force which enters the cleaning rod from the outside of the cleaning rod through the dirt suction port is formed. Under the combined action of the suction force and the stirring force generated by the stress part, impurities and jelly adsorbed on the inner wall of the filter element can be easily washed off from the filter element and enter the cleaning rod through the dirt suction port to realize washing.

This back flush filter passes through impeller and bearing structure's cooperation messenger and washs the stick and can form quick rotation automatically when washing to by atress portion and soil pick-up mouth combined action and will be attached to impurity and the jelly on the filter core can be inhaled smoothly and wash the stick in rotating the in-process, improved the flushing effect of filter core well.

In the backwash filter, the dirt suction ports are arranged on the outer side surface of the stress portion, the number of the dirt suction ports is at least two, the dirt suction ports are arranged along the axial direction of the cleaning rod, the stress portion forms a blocking section between every two adjacent dirt suction ports, and the outer side surface of the blocking section is flush with the outer side surface of the stress portion. The stress part forms a blocking section between two adjacent sewage suction ports, and the outer side surface of the blocking section is flush with the outer side surface of the stress part, which also means that the sewage suction ports are mutually independent and do not interfere with each other, so that negative pressure is formed at each sewage suction port at the first time when the cleaning rod rotates.

In the background art, the whole straight groove is firstly pulled at the side part of the cleaning rod, and then the straight groove is divided into a plurality of dirt suction ports by utilizing the ribs, so that when the cleaning rod rotates, negative pressure is formed at the notch of the straight groove to suck impurities and jelly into the straight groove, and then the impurities and the jelly are distributed through the dirt suction ports, namely the negative pressure of the pre-filter in the background art is formed at the notch of the straight groove instead of the dirt suction ports, and the negative pressure effect generated by the whole straight groove is obviously weaker and is determined by the length of the straight groove. Compared with the background art, the negative pressure generated by the arrangement mode of the sewage suction ports in the application is obviously larger, so that impurities and jelly are easier to suck down from the inner wall of the filter element, and the obtained flushing effect is better.

In the backwash filter, the number of the stress parts is at least two, and the position of each dirt suction port on one stress part along the axial direction of the cleaning rod is staggered with the position of each dirt suction port on the other stress part along the axial direction of the cleaning rod.

Because the filter core is the tube-shape, through setting up the quantity of atress portion to two at least, and set up each soil pick-up mouth on one of them atress portion along washing excellent axial position and stagger each soil pick-up mouth on the other atress portion along washing excellent axial position each other when processing man-hour, this so equivalent to make each soil pick-up mouth all inequality with the face that the filter core is relative when rotating, this means that can carry out the soil pick-up to the whole inner wall of filter core through each soil pick-up mouth along with washing excellent rotation when washing excellent rotation, the soil pick-up area reaches the biggest, the soil pick-up effect who obtains is best.

In the above backwash filter, the force-receiving portion has two inclined surfaces and a dirt-suction surface connecting the two inclined surfaces, the distance between the two inclined surfaces decreases gradually along the protruding direction of the force-receiving portion, the dirt-suction port is located on the dirt-suction surface, and the outer side surface of the blocking section is located on the dirt-suction surface.

The force-bearing part is provided with two inclined planes extending forwards, the distance between the two inclined planes is gradually reduced along the protruding direction of the force-bearing part, so that the force-bearing part forms a flat shape with the thickness of the force-bearing part gradually reduced along the protruding direction of the force-bearing part, and the shape is favorable for the rotation of the cleaning rod. Inhale dirty face and be located between two inclined planes, just indicate just also that to inhale dirty face and be located the inner wall that the atress portion is closest to the filter core but not with the inner wall laminating of filter core, can shorten the distance between soil pick-up mouth and the filter core inner wall like this on the one hand, make impurity and the gelatinoid on the filter core inhale more easily in the washing stick, improve and wash the effect, on the other hand can prevent again to contact and lead to washing stick by the dead phenomenon of card in atress portion and filter core inner wall.

In the backwash filter, the cleaning rod is made of plastic materials, and the cleaning rod and the impeller are of an integrated structure.

As is well known, plastic parts are formed in one step through a die, so that the cleaning rod is formed by plastic materials, the die opening can be carried out according to the structure of the cleaning rod fixedly connected with the impeller, and the cleaning rod formed through the die can be provided with the impeller. The mold opening is related to the production cost of an enterprise, although the mold opening is also related to the purchase cost of a user, the enterprise is repeatedly used after the mold is formed, so the purchase cost added to a single user is far less than the purchase cost added to the configuration of a driving motor and can be almost ignored.

In the backwash filter, the filter element is provided with a connecting rib, at least one end of the connecting rib is fixedly connected with the inner wall of the decontamination opening, the impeller comprises a support platform and a plurality of blades which are connected along the circumferential direction of the support platform, the support structure comprises a positioning raised head which is raised from the connecting rib, and the positioning raised head is abutted against the center of the lower end of the support platform during backwash. If direct lower extreme that will wash the stick supports to lean on to rotate on the diapire of filter core inner chamber, then appear silt card easily and go into between washing stick lower extreme and the filter core inner chamber diapire and lead to washing stick dead problem by the card.

According to the backwashing filter, the connecting ribs are arranged on the filter element, at least one end of each connecting rib is fixedly connected with the inner wall of the decontamination opening, the connecting ribs are provided with the upward positioning raised heads, water enters the inner cavity of the cleaning rod from the decontamination opening and acts on the supporting table of the impeller during backwashing, the supporting table is stressed to drive the cleaning rod to move downwards and enable the positioning raised heads to abut against the center of the lower end of the supporting table, and therefore the cleaning rod can rotate by taking the positioning raised heads as the circle center. The existence of location plush copper makes and forms certain clearance between the diapire of washing stick's bottom and filter core inner chamber simultaneously, and this kind of structure can prevent that silt card from between the diapire of washing stick bottom and filter core inner chamber, has improved the smooth and easy nature when washing stick rotates to guaranteed to a certain extent and washed the effect that the washing stick rotated and brought.

In the backwash filter, the lower end surface of the support table is an inward concave conical surface.

The lower end face of the supporting table is set to be an inwards concave conical surface, so that when the positioning raised head abuts against the lower end of the supporting table to enable the cleaning rod to rotate, the positioning raised head abuts against the lower end of the supporting table to be prevented from moving everywhere due to rotation of the cleaning rod, the cleaning rod can rotate more stably, and therefore in the rotating process of the cleaning rod, impurities and jelly can be stably sucked into the cleaning rod through the dirt sucking ports to improve the backwashing effect.

In the backwash filter, as another technical scheme, the filter element is provided with a connecting rib, at least one end of the connecting rib is fixedly connected with the inner wall of the decontamination opening, the support structure comprises a thimble protruding from the connecting rib, a convex shoulder is arranged on the side part of the thimble, the thimble penetrates through a central hole of the impeller during backwash, and the lower end of the impeller abuts against the convex shoulder to form a gap between the bottom of the cleaning rod and the bottom wall of the inner cavity of the filter element.

Because the thimble opposite to the connecting hole at the center of the impeller is arranged on the connecting rib, when the drain outlet is opened and the cleaning rod moves downwards, the thimble can penetrate through the central hole of the impeller, and meanwhile, because the thimble is provided with the convex shoulder, the lower end of the impeller can abut against the convex shoulder, so that the cleaning rod rotates by taking the thimble as the center of a circle, and meanwhile, a certain gap is formed between the bottom of the cleaning rod and the bottom wall of the inner cavity of the filter element due to the existence of the convex shoulder.

In the backwashing filter, a positioning structure which can stop the rotation of the cleaning rod when the sewage draining outlet is closed is arranged between the cleaning rod and the filter element.

Although the sewage draining outlet is closed during normal filtration, the cleaning rod may be rotated by water inflow in the process, which is a technical difficulty that must be overcome when the cleaning rod is automatically rotated.

Therefore, the backwashing filter is provided with the positioning structure between the cleaning rod and the filter element, and the cleaning rod can stop rotating when the sewage draining port is closed through the positioning structure, so that the automatic rotation of the cleaning rod is realized to improve the washing effect, and the unnecessary rotation of the cleaning rod during normal filtration can be realized.

In the above backwash filter, the positioning structure comprises a floating ball arranged in the cleaning rod, a leaning part arranged on the outer side of the upper end of the floating ball and a stopping part arranged on the inner side of the upper end of the filter element, and when the sewage draining outlet is closed, the cleaning rod floats upwards under the buoyancy action of the floating ball and enables the side part of the leaning part to lean against the side part of the stopping part.

When the drain was closed, the internal and external pressure of body was in balanced state, and the cleaning rod only received this exogenic action of buoyancy of floater this moment. The buoyancy of the floating ball drives the cleaning rod to float upwards, and the abutting part on the outer side of the cleaning rod abuts against the stopping part on the inner side of the upper end of the filter element, so that the circumferential rotation of the cleaning rod is stopped by the stopping part, and the cleaning rod is ensured to be kept still during normal filtration.

In the backwash filter, the upper end surface of the filter element is provided with a circular ring-shaped stop plate, the inner side of the stop plate is provided with a cross-shaped stop piece, and the stop part is a flanging bent downwards from the stop piece.

The filter core is the tube-shape, and difficult direct processing of inner wall at the filter core has backstop portion when producing, consequently sets up one on the backstop board and be ring shape and inboard have and be cross backstop piece earlier, then processes out the turn-ups of a downwarping on the backstop piece and regard as backstop portion, and the backstop piece of cross form can guarantee can not influence the normal into water in the filter core.

In the backwash filter, as another technical scheme, the positioning structure comprises an iron sheet fixed in the upper end of the cleaning rod and a magnet arranged in the upper end of the filter element, and the cleaning rod is adsorbed on the magnet under the action of magnetic force when the sewage draining outlet is closed.

When the drain was closed, the internal and external pressure of body was in balanced state, and the cleaning rod only received the magnet of filter core upper end inboard at this moment to the suction of iron sheet. The cleaning rod floats upwards under the action of the magnetic force of the magnet, and the upper end of the cleaning rod is adsorbed on the magnet, so that the cleaning rod can be kept still during normal filtration.

Compared with the prior art, this back flush filter makes the cleaning rod automatically form quick rotation when washing through impeller and bearing structure's cooperation to rotate the in-process and inhale the cleaning rod with impurity and the gelatinous thing on the filter core in and realize washing, wash the powerful negative pressure combined action that the power of stirring that the atress portion produced and produced in each soil pick-up department among the process, consequently the soil pick-up power that forms is stronger, thereby it is better to make the washing effect, wash also more thoroughly.

Drawings

FIG. 1 is a schematic view of the present backflush filter.

FIG. 2 is a schematic view of the backwash filter according to the first embodiment of the present invention.

FIG. 3 is a schematic view of a cleaning rod in the first embodiment of the backflush filter.

Fig. 4 is another view of fig. 3.

Fig. 5 is a schematic view of a filter element in a first embodiment of the backflush filter.

FIG. 6 is a diagram showing the relationship between the cleaning rod and the stopper plate during normal filtration in the embodiment of the backwash filter.

FIG. 7 is a schematic view of the filter element at another angle in the first embodiment of the backflush filter.

In the figure, 1, a body; 1a, a shell; 1a1 and a sewage draining outlet; 1b, a top cover; 1b1, a water inlet; 1b2, a water outlet; 2. a filter element; 2a, water outlet holes; 2b, a decontamination opening; 2c, connecting ribs; 2d, a stop plate; 2d1, a stop sheet; 2d11, a stopper; 2e, positioning the raised head; 3. a cylindrical filter screen; 4. cleaning the rod; 4a, a force-receiving part; 4a1, a dirt absorbing surface; 4a11 and a sewage suction port; 4a12, a barrier section; 4a2, an inclined surface; 4b, b an abutting portion; 5. an impeller; 5a, a support table; 5b, a blade; 6. a floating ball; 7. a cover plate; 8. a blowdown ball valve; 9. and (5) sealing rings.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1 and 2, a backwashing filter comprises a body consisting of a shell 1a and a top cover 1b, wherein the upper end of the shell 1a is open, the top cover 1b is connected to the upper end of the shell 1a, the inner cavity of the shell 1a is empty, the top cover 1b is provided with a water inlet 1b1 and a water outlet 1b2, the water inlet 1b1 and the water outlet 1b2 are respectively communicated with the inner cavity of the shell 1a, a filter element 2 is arranged in the shell 1a, the lower end of the shell 1a is provided with a sewage discharge port 1a1 communicated with the inner cavity of the shell 1a, a sewage discharge ball valve 8 is in threaded connection with the sewage discharge port 1a1, when the backwashing filter is used, the water inlet 1b1 is connected with a water inlet pipe, the water outlet 1b2 is connected with a water outlet pipe, and the sewage discharge valve is connected with a sewage discharge pipe.

As shown in fig. 2, the filter element 2 is cylindrical, a cylindrical filter screen 3 is sleeved outside the filter element 2, the upper end of the filter element 2 is open, the inner side of the top cover 1b is provided with an annular retaining shoulder, and the annular blocking shoulder is propped against the upper end of the filter element 2, a sealing ring 9 is arranged between the annular blocking shoulder and the upper end of the filter element 2, and the water inlet 1b1 of the top cover 1b is communicated with the inner cavity of the filter element 2. 2 lateral parts of filter core run through along circumference and are equipped with a plurality of apopores 2a, and the inner chamber of casing 1a is linked together through apopore 2a with the inner chamber of filter core 2, and drain 1a1 is located filter core 2 under, is equipped with sealing washer 9 between the lower extreme outside of filter core 2 and the inner wall of casing 1 a.

As shown in fig. 2, 3 and 4, a cleaning rod 4 capable of rotating relative to the filter element 2 is arranged in the filter element 2, the cleaning rod 4 is hollow, the lower end of the cleaning rod 4 is open, at least two flat convex force-receiving portions 4a are arranged on the outer side of the cleaning rod 4, the force-receiving portions 4a are provided with two inclined surfaces 4a2 and a dirt suction surface 4a1 connecting the two inclined surfaces 4a2, the distance between the two inclined surfaces 4a2 is gradually reduced along the convex direction of the force-receiving portion 4a, at least two dirt suction ports 4a11 are arranged on the dirt suction surface 4a1 along the axial direction of the cleaning rod 4, each dirt suction port 4a11 is thin, the force-receiving portion 4a forms a blocking section 4a12 between the two adjacent dirt suction ports 4a11, the outer side surface of the blocking section 4a12 is flush with the outer side surface of the force-receiving portion 4a, in the embodiment, the outer side surface of the blocking section 4a12 is located on the dirt suction surface 4a1, and the position of the blocking section 4a is staggered with the axial direction of the dirt-receiving portion 4 a. The bottom wall of the inner cavity of the filter element 2 is provided with a decontamination opening 2b communicated with the sewage discharge opening 1a 1. The lower end of the cleaning rod 4 is fixedly connected with an impeller 5, the cleaning rod 4 is made of plastic materials, and the impeller 5 and the cleaning rod 4 are of an integrated structure.

As shown in fig. 2 and 7, in the present embodiment, a support structure is provided between the lower end of the cleaning rod 4 and the bottom wall of the inner cavity of the filter element 2 to allow the cleaning rod 4 to rotate. The filter element 2 is provided with a cross-shaped connecting rib 2c, each end of the connecting rib 2c is fixedly connected with the inner wall of the decontamination opening 2b, the impeller 5 comprises a support table 5a and a plurality of blades 5b connected along the circumferential direction of the support table 5a, the support structure comprises a positioning raised head 2e protruding from the connecting rib 2c, the positioning raised head 2e is abutted against the center of the lower end of the support table 5a during backwashing, and the lower end face of the support table 5a is an inner conical surface. When washing, move down and make impeller 5 support and lean on location plush copper 2e through washing stick 4, can make washing stick 4 use location plush copper 2e to rotate as the centre of a circle, the existence of location plush copper 2e makes and forms the clearance between the diapire of washing stick 4's bottom and 2 inner chambers of filter core simultaneously, and this kind of structure can prevent that silt card from between the diapire of washing stick 4 bottom and 2 inner chambers of filter core, guarantees the normal rotation of washing stick 4.

As shown in fig. 5 and 6, a positioning structure for stopping the rotation of the washing rod 4 when the sewage draining exit 1a1 is closed is arranged between the washing rod 4 and the filter element 2. The positioning structure comprises a floating ball 6 arranged in the cleaning rod 4, an abutting part 4b arranged on the outer side of the upper end of the cleaning rod 4 and a stopping part 2d11 arranged on the inner side of the upper end of the filter element 2. In this embodiment, the upper end of cleaning rod 4 is connected with

apron

7, and 2 up end of filter core has annular backstop board 2d, and backstop board 2d inboard has the backstop piece 2d1 that is cross, and backstop portion 2d11 is the turn-ups of buckling downwards from backstop piece 2d1, and floater 6 drives cleaning rod 4 come-up and makes the lateral part that leans on portion 4b and the lateral part of backstop portion 2d11 counterbalance under no exogenic action.

When the back flush filter is used for normal filtration, the drain valve is in a closed state. Because the sealing ring 9 is arranged between the upper end of the filter element 2 and the top cover 1b, water in the water inlet 1b1 of the top cover 1b can only enter the filter element 2. Then water is filtered through the water outlet hole 2a on the filter element 2 and the cylindrical filter screen 3 sleeved outside the filter element 2 and enters the inner cavity of the shell 1a, and because the sealing ring 9 is arranged between the outer side of the lower end of the filter element 2 and the inner wall of the shell 1a, the water entering the inner cavity of the shell 1a can only flow out from the water outlet 1b2 on the top cover 1b for users to use.

In the normal filtering process, because the dirt discharging ball valve 8 is in a closed state, the dirt discharging pipe is separated from the dirt removing opening 2b at the bottom of the filter element 2, although water enters the cleaning rod 4 from the dirt sucking opening 4a11 on the cleaning rod 4, the water cannot flow into the dirt discharging pipe through the dirt removing opening 2b at the bottom of the filter element 2. This means that the pressure difference between the inside and the outside of the housing 1a is in a balanced state, the cleansing rod 4 is only subjected to the external force of the buoyancy of the float 6, and the cleansing rod 4 is kept in a floating state under the buoyancy of the float 6, in this state, the side of the abutting portion 4b at the outer side of the upper end of the cleansing rod 4 abuts against the side of the stopping portion 2d11 on the filter element 2, and the stopping portion 2d11 thus forms a stop for the circumferential rotation of the cleansing rod 4, so that the cleansing rod 4 is kept still during the normal filtering process.

When the working time is long and more impurities and jelly are attached to the filter element 2, the drain valve needs to be opened to flush the filter element 2, so that the filtering effect is prevented from being influenced. The specific process of flushing the cartridge 2 is such that: the drain valve is opened, the drain pipe is communicated with the decontamination opening 2b at the bottom of the filter element 2, and then water enters the cleaning rod 4 from the decontamination opening 4a11 on the cleaning rod 4 and then is directly drained into the drain pipe through the decontamination opening 2b at the bottom of the filter element 2. When water enters the cleaning rod 4 and passes through the impeller 5, water flow impacts the supporting table 5a of the impeller 5, so that the impeller 5 is forced downwards to drive the cleaning rod 4 to move downwards together, the cleaning rod 4 sinks by overcoming the buoyancy of the floating ball 6, and the abutting part 4b on the cleaning rod 4 is separated from the stopping part 2d11 on the filter element 2.

The cleaning rod 4 moves downwards to enable the upper end of the positioning raised head 2e to abut against the center of the lower end of the support table 5a of the impeller 5, so that when water flows through the impeller 5, the cleaning rod 4 rotates rapidly by taking the positioning raised head 2e as the center of a circle. Since the outer side of the cleaning rod 4 is provided with the stress part 4a protruding in a flat shape, the stress part 4a can stir the water between the outer side of the cleaning rod 4 and the inner wall of the filter element 2 in the rotating process of the cleaning rod 4. Meanwhile, as the outer side of the cleaning rod 4 is provided with the dirt suction ports 4a11 communicated with the inner cavity of the cleaning rod 4, the cleaning rod 4 generates negative pressure at each dirt suction port 4a11 in the rotating process, namely, a suction force entering the cleaning rod 4 from the outside of the cleaning rod 4 through the dirt suction ports 4a11 is formed. Under the combined action of the suction force and the stirring force generated by the stress part 4a, impurities and jelly adsorbed on the inner wall of the filter element 2 are easily washed off from the filter element 2, enter the cleaning rod 4 through the sewage suction port 4a11 and finally enter the sewage discharge pipe through the sewage discharge port 2b and the sewage discharge ball valve 8 to realize washing.

After the blowdown is finished, close blowdown ball valve 8 again and make the blow off pipe cut off with the decontamination mouth 2b of filter core 2 bottom, decontamination mouth 2b department no longer produces outside draft, washs excellent 4 and come up again and make the lateral part that leans on portion 4b and the lateral part of backstop portion 2d11 to lean on once more under the buoyancy of floater 6, washs excellent 4 and has just stopped the rotation from this.

This back flush filter passes through impeller 5 and location plush copper 2e and impeller 5 on the supporting bench 5a the cooperation of terminal surface down make washing stick 4 can form quick rotation automatically when washing to in rotating the in-process by atress portion 4a and soil pick-up mouth 4a11 combined action and will be attached to impurity and the gelatinous thing on filter core 2 can be inhaled smoothly and wash stick 4, improved the washing effect of filter core 2 well. The cleaning rod 4 can automatically rotate to complete the washing without operation in the washing process, so that the washing machine has the advantage of more convenient operation. And compare in manual operation drive cleaning rod 4 and rotate, cleaning rod 4 slew velocity is faster in this back flush filter, and the soil pick-up that forms is stronger, washes more thoroughly, and the washing effect who obtains is also better.

Example two

The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in this embodiment, the positioning structure comprises an iron sheet fixed in the upper end of the cleaning rod 4 and a magnet arranged in the upper end of the filter element 2, and the cleaning rod 4 is attracted to the magnet under the action of magnetic force when the sewage draining outlet 1a1 is closed. When the sewage draining outlet 1a1 is closed, the internal pressure and the external pressure of the body are in a balanced state, and at the moment, the cleaning rod 4 only receives the suction force of the magnet on the inner side of the upper end of the filter element 2 to the iron sheet. The washing rod 4 floats under the magnetic force of the magnet, and the upper end of the washing rod 4 is adsorbed on the magnet, so that the washing rod 4 can be kept still during normal filtration.

EXAMPLE III

The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in this embodiment, the support structure comprises a thimble protruding from the connecting rib 2c, the side of the thimble has a shoulder, the thimble passes through the central hole of the impeller 5 during back flushing, and the lower end of the impeller 5 abuts against the shoulder and forms a gap between the bottom of the cleaning rod 4 and the bottom wall of the inner cavity of the filter element 2.

Because the thimble that has on the splice bar and just right with the connecting hole of impeller 5 center department, so when drain 1a1 opens and make washing stick 4 downstream back, the thimble can pass the connecting hole, simultaneously because have the convex shoulder on the thimble, the bottom of impeller 5 will support and lean on the convex shoulder so, thereby make washing stick 4 use the thimble to rotate as the centre of a circle, the existence of convex shoulder makes and forms certain clearance between the diapire of washing stick 4 and filter core 2 inner chamber, this kind of structure also can prevent that silt card from between the diapire of washing stick 4 bottom and filter core 2 inner chamber, improve the smooth and easy nature when washing stick 4 rotates when realizing automatic washing through washing stick 4 automatic rotation.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments, or alternatives may be employed, by those skilled in the art, without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. A back washing filter comprises a body (1), a water inlet (1 b 1), a water outlet (1 b 2) and a drain outlet (1 a 1) which can be opened and closed are arranged on the body (1), a cylindrical filter element (2) is arranged in the body (1), the water inlet (1 b 1) and the water outlet (1 b 2) of the body (1) are communicated through the filter element (2), a cleaning rod (4) with an inner cavity is arranged in the filter element (2), a dirt suction port (4 a 11) communicated with the inner cavity of the cleaning rod (4) is arranged on the side part of the cleaning rod (4), a dirt removing port (2 b) communicated with the drain outlet (1 a 1) is arranged at the bottom of the filter element (2), the lower end of the cleaning rod (4) is opened and is opposite to the dirt removing port (2 b), a stress part (4 a) is arranged on the outer side of the cleaning rod (4), the back washing filter is characterized in that a cleaning rod (5) is arranged in the impeller (4), the impeller (5) is fixedly connected in the lower end of the cleaning rod (4), a water flow supporting structure is arranged between the impeller (4) and the bottom wall (2) and the impeller (4) and can be positioned when the water flow (4) stops when the cleaning rod (4) and the dirt removing rod (4) rotates, the positioning structure comprises a floating ball (6) arranged in the cleaning rod (4), a leaning part (4 b) arranged on the outer side of the upper end of the cleaning rod (4) and a stopping part (2 d 11) arranged on the inner side of the upper end of the filter element (2), when the sewage draining outlet (1 a 1) is closed, the cleaning rod (4) floats upwards under the buoyancy action of the floating ball (6) and the side part of the leaning part (4 b) is leaned against the side part of the stopping part (2 d 11).

2. The backwashing filter of claim 1, wherein the dirt suction ports (4 a 11) are arranged on the outer side surface of the force receiving portion (4 a), the number of the dirt suction ports (4 a 11) is at least two, each dirt suction port (4 a 11) is arranged along the axial direction of the cleaning rod (4), the force receiving portion (4 a) forms a blocking section (4 a 12) between two adjacent dirt suction ports (4 a 11), and the outer side surface of the blocking section (4 a 12) is flush with the outer side surface of the force receiving portion (4 a).

3. The backflushing filter according to claim 2, characterized in that the number of the force-receiving portions (4 a) is at least two, and the position of each soil suction port (4 a 11) on one force-receiving portion (4 a) along the axial direction of the cleaning rod (4) is staggered from the position of each soil suction port (4 a 11) on the other force-receiving portion (4 a) along the axial direction of the cleaning rod (4).

4. The backwashing filter of claim 2 or 3, wherein the force receiving portion (4 a) has two inclined surfaces (4 a 2) and a dirt suction surface (4 a 1) connecting the two inclined surfaces (4 a 2), a distance between the two inclined surfaces (4 a 2) is gradually reduced along a protruding direction of the force receiving portion (4 a), the dirt suction port (4 a 11) is located on the dirt suction surface (4 a 1), and an outer side surface of the blocking section (4 a 12) is located on the dirt suction surface (4 a 1).

5. The backwash filter as in claim 1, wherein the cleaning rod (4) is made of plastic material and the cleaning rod (4) and the impeller (5) are of one-piece construction.

6. The backflushing filter according to claim 1, wherein the filter element (2) has a connecting rib (2 c), at least one end of the connecting rib (2 c) is fixedly connected with the inner wall of the decontamination opening (2 b), the impeller (5) comprises a support platform (5 a) and a plurality of blades (5 b) connected along the circumference of the support platform (5 a), the support structure comprises a positioning raised head (2 e) protruding from the connecting rib (2 c), and the positioning raised head (2 e) abuts against the center of the lower end of the support platform (5 a) during backflushing.

7. The backwash filter as defined in claim 1, wherein said filter element (2) has a connecting rib (2 c), at least one end of said connecting rib (2 c) is fixedly connected to the inner wall of said dirt removing port (2 b), said support structure comprises a thimble protruding from said connecting rib (2 c), said thimble has a shoulder at its side, said thimble passes through the center hole of said impeller (5) during backwash, and the lower end of said impeller (5) abuts against said shoulder and forms a gap between the bottom of said cleaning rod (4) and the bottom wall of the inner cavity of said filter element (2).

8. The backwashing filter of claim 1, wherein the filter element (2) has an annular stop plate (2 d) on the upper end surface, the stop plate (2 d) has a cross-shaped stop piece (2 d 1) on the inner side, and the stop portion (2 d 11) is a flange bent downward from the stop piece (2 d 1).