阅读说明：本技术 一种前置过滤器及前置过滤器冲洗转换装置 (Leading filter and leading filter wash conversion equipment ) 是由 胡效军 陈志超 顾博焕 于 2019-11-21 设计创作，主要内容包括：本发明公开了一种前置过滤器冲洗转换装置,包括用以设置于前置过滤器的阀头内的正反冲洗切换件和用以连接于前置过滤器的瓶身且贴合于瓶身内的滤芯外周转动的刮洗部；正反冲洗切换件与阀头转动连接以使流经滤芯过滤面的流体反向；刮洗部贴合滤芯的一侧设有虹吸口,刮洗部内设有自虹吸口延伸至瓶身底部的第一排污孔的虹吸通道；虹吸通道在刮洗部以第一转动方向绕滤芯转动时接通。通过调节正反冲洗切换件实现流体的流向变换,再结合刮洗部的刮洗和虹吸实现滤芯的清洁,不仅扩大了清洁方式的可选择性,无论是单一的清洁方式还是不同清洁方式组合使用,均能够提高清洁效果。还公开了一种包括上述前置过滤器冲洗转换装置的前置过滤器。(The invention discloses a pre-filter flushing conversion device, which comprises a forward and reverse flushing switching piece and a scraping and washing part, wherein the forward and reverse flushing switching piece is arranged in a valve head of a pre-filter, the scraping and washing part is connected to a bottle body of the pre-filter and is attached to the periphery of a filter element in the bottle body in a rotating manner; the forward and reverse flushing switching piece is rotationally connected with the valve head so as to lead the fluid flowing through the filter surface of the filter element to be reverse; one side of the scraping and washing part, which is attached to the filter element, is provided with a siphon port, and a siphon channel which extends from the siphon port to a first sewage draining hole at the bottom of the bottle body is arranged in the scraping and washing part; the siphon channel is connected when the wiping part rotates around the filter element in a first rotation direction. Realize fluidic flow direction through adjusting positive and negative washing switching piece and change, combine to scrape the cleaning that washes and siphon realization filter core of portion of washing again, not only enlarged the selectivity of cleaning method, no matter be single cleaning method or different cleaning method combination uses, the homoenergetic improves clean effect. Also discloses a prefilter comprising the prefilter flushing and converting device.)

1. A pre-filter flush switch apparatus, comprising:

a positive and negative flushing switching piece (4) arranged in the valve head (1) of the pre-filter; the positive and negative flushing switching piece (4) is rotationally connected with the valve head (1) so as to enable fluid flowing through the filtering surface of the filter element (3) to reversely flow;

a scraping and washing part (5) which is used for connecting with the bottle body (2) of the front filter and is attached to the periphery of the filter element (3) in the bottle body (2) to rotate; one side of the scraping and washing part (5) which is attached to the filter element (3) is provided with a siphon port (521), and a siphon channel which extends from the siphon port (521) to a first sewage hole (21) at the bottom of the bottle body (2) is arranged in the scraping and washing part (5); the siphon channel is connected when the wiping section (5) rotates in a first direction of rotation around the filter element (3).

2. Pre-filter flush switch arrangement according to claim 1, characterized in that the valve head (1) comprises a water inlet (11) and a water outlet (12); the positive and negative flushing switching piece (4) communicated with the end part of the filter element (3) is provided with a water inlet hole (41) used for being superposed with the water inlet (11) to realize communication, a water outlet hole (42) used for being superposed with the water outlet (12) to realize communication, and a stop block (10) which is positioned below the water inlet hole (41) and used for blocking a channel between the bottle body (2) and the filter element (3);

one of the valve head (1) and the positive and negative flushing switching piece (4) rotates relative to the bottle body (2), and the other one is fixed relative to the bottle body (2) so as to realize that the water inlet (41) is communicated with only one of the water outlet (42).

3. Front filter flushing switch device according to claim 2, characterized in that the positive/negative flushing switch (4) comprises a cylindrical tube arranged coaxially to the filter cartridge (3); the cylindrical pipe body is rotationally connected with the filter element (3), and an angle limiting part (13) is arranged between the cylindrical pipe body and the filter element; the inlet opening (41) with apopore (42) set up in the tube-shape body, just the inlet opening (41) with the contained angle of apopore (42) equals the spacing angle of the spacing portion of angle (13).

4. The pre-filter flushing and switching device as recited in claim 1, characterized in that the side of the scraping and washing part (5) away from the filter element (3) is provided with scraping and washing ribs (522) protruding towards the inner wall of the bottle body (2) and used for scraping and washing the inner wall; the length direction of the scraping and washing rib (522) is parallel to the length direction of the bottle body (2).

5. Pre-filter wash transition device according to claim 1, characterized in that the scraping section (5) comprises a bracket (51) arranged at the bottom and a scraping tube (52) fixed above the bracket (51); the bracket (51) is attached to the bottom end of the filter element (3), and the scraping pipe (52) extends along the axis of the filter element (3); the siphon opening (521) extends along the length of the scraper tube (52).

6. Front filter flushing transition device according to claim 5, characterized in that the scraping pipe (52) comprises a first scraping pipe for fitting to the lower half of the filter cartridge (3) and a second scraping pipe for fitting to the upper half of the filter cartridge (3), and that the first scraping pipe and the second scraping pipe are symmetrical to the axis of the filter cartridge (3).

7. Prefilter wash transition device according to any one of claims 1 to 6, wherein the lower end face of the scraping section (5) is rotatably connected to the filter cartridge (3) by a transition cover (6), the siphon channel communicating with the first drain hole (21) through the second drain hole (62) of the transition cover (6).

8. The pre-filter flush switch apparatus of claim 7,

the conversion cover (6) is also provided with a third sewage draining hole (61) communicated with the second sewage draining hole (62), and the third sewage draining hole (61) is arranged above the second sewage draining hole (62);

the bottom of scraping and washing portion (5) is equipped with and is used for doing scrape washing portion (5) court when first direction of rotation rotates with fourth blowhole (511) of third blowhole (61) disconnection, fourth blowhole (511) are in when scraping and washing portion (5) and rotating towards the second direction of rotation with third blowhole (61) switch-on.

9. The pre-filter flushing conversion device according to claim 8, characterized in that the middle of the lower end face of the scraping part (5) is provided with two parallel spaced limiting blocks (512); the middle part of the upper end surface of the conversion cover (6) is provided with a limiting clamping strip (63) which is embedded into the two limiting blocks (512);

when the limiting clamping strip (63) rotating towards the first rotating direction rotates to a first angle between the two limiting blocks (512), the fourth sewage draining hole (511) is disconnected with the third sewage draining hole (61);

when the limiting clamping strip (63) rotating towards the second rotating direction rotates to a second angle between the two limiting blocks (512), the fourth sewage discharge hole (511) is communicated with the third sewage discharge hole (61).

10. A prefilter comprising a valve head (1), a body (2) having one end connected to said valve head (1), and a filter element (3) inserted into said body (2), wherein said prefilter further comprises a prefilter flush transition device according to any one of claims 1 to 9.

Technical Field

The invention relates to the field of filters, in particular to a pre-filter flushing conversion device. Also relates to a prefilter comprising the prefilter flushing and converting device.

Background

After the existing pre-filter works for a long time, impurities carried in raw water are embedded in meshes of the filter element, so that the filter element is easily blocked. When the filter element is cleaned, the filter element is washed by using relatively clean water flow as cleaning liquid flowing into the front filter, and the cleaning mode is also called as a forward washing mode. When the adoption is washed along dashing the type cleaning means, the washing liquid washes along stainless steel mesh surface downwards, inlays the tiny particle impurity in the mesh and can't effectively be washed and cause the filter core to block up, consequently can't effectively wash the tiny particle impurity that holds back on the mesh.

In summary, how to improve the cleaning effect of the prefilter becomes a problem to be solved by those skilled in the art.

Disclosure of Invention

The invention aims to provide a pre-filter flushing conversion device, which improves the cleaning effect of a pre-filter and enlarges the selectivity of the cleaning mode.

To achieve the above object, the present invention provides a pre-filter flush switch device, comprising:

the positive and negative flushing switching piece is arranged in the valve head of the pre-filter; the forward and reverse flushing switching piece is rotationally connected with the valve head so as to enable fluid flowing through the filter surface of the filter element to flow reversely;

a scraping and washing part which is used for connecting with the bottle body of the pre-filter and is attached to the periphery of the filter element in the bottle body to rotate; one side of the scraping and washing part, which is attached to the filter element, is provided with a siphon port, and a siphon channel which extends from the siphon port to a first sewage draining hole at the bottom of the bottle body is arranged in the scraping and washing part; the siphon channel is connected when the scraping and washing part rotates around the filter element in a first rotating direction.

Preferably, the valve head comprises a water inlet and a water outlet; the positive and negative flushing switching piece communicated with the end part of the filter element is provided with a water inlet hole for being superposed with the water inlet to realize communication, a water outlet hole for being superposed with the water outlet to realize communication and a stop block positioned below the water inlet hole and used for blocking a channel between the bottle body and the filter element;

one of the valve head and the positive and negative flushing switching piece rotates relative to the bottle body, and the other one is fixed relative to the bottle body, so that the water inlet is communicated with only one of the water outlets.

Preferably, the forward-reverse flushing switching piece comprises a cylindrical pipe body which is coaxial with the filter element; the cylindrical pipe body is rotationally connected with the filter element, and an angle limiting part is arranged between the cylindrical pipe body and the filter element; the inlet opening with the apopore set up in the tube-shape body, just the inlet opening with the contained angle of apopore equals the spacing angle of the spacing portion of angle.

Preferably, one side of the scraping and washing part, which is far away from the filter element, is provided with a scraping and washing rib which is convex towards the inner wall of the bottle body and is used for scraping and washing the inner wall; the length direction of the scraping and washing rib is parallel to the length direction of the bottle body.

Preferably, the scraping and washing part comprises a bracket arranged at the bottom and a scraping and washing pipe fixed above the bracket; the bracket is attached to the bottom end of the filter element, and any scraping and washing pipe extends along the axis of the filter element; the siphon opening extends in the longitudinal direction of the wash tube.

Preferably, scrape and wash the pipe including being used for laminating in the first scraping pipe of filter core the latter half and being used for laminating in the second scraping pipe of filter core the first, just first scraping pipe with the second is scraped and is washed the axis that the pipe is symmetrical in the filter core.

Preferably, the lower terminal surface of portion of scraping and washing is passed through the conversion lid and is rotated and connect in the filter core, the siphon passageway passes through the second blowoff hole and the first blowoff hole intercommunication of conversion lid.

Preferably, the conversion cover is provided with a third sewage draining hole communicated with the second sewage draining hole, and the third sewage draining hole is arranged above the second sewage draining hole;

the bottom of scraping and washing portion is equipped with and is used for being worked as scraping and washing portion court when first direction of rotation rotates with the fourth blowhole of third blowhole disconnection, the fourth blowhole is in scraping and washing portion when rotating towards the second direction of rotation with the third blowhole switch-on.

Preferably, the middle part of the lower end face of the scraping and washing part is provided with two parallel spacing limit blocks; the middle part of the upper end surface of the conversion cover is provided with a limiting clamping strip which is embedded into the two limiting blocks;

when the limiting clamping strip rotating towards the first rotating direction rotates to a first angle between the two limiting blocks, the fourth sewage draining hole is disconnected with the third sewage draining hole;

when the limiting clamping strip rotating towards the second rotating direction rotates to a second angle between the two limiting blocks, the fourth sewage draining hole is communicated with the third sewage draining hole.

A pre-filter comprises a valve head, a bottle body with one end connected with the valve head, a filter element sleeved in the bottle body in a penetrating way, and the pre-filter washing and converting device.

Compared with the prior art, the front filter flushing conversion device provided by the invention comprises a front-back flushing switching piece arranged in the valve head of the front filter and a scraping and washing part which is connected with the bottle body of the front filter and is attached to the periphery of the filter element in the bottle body to rotate.

The forward and reverse flushing switching piece is rotationally connected with the valve head so as to enable fluid flowing through the filter surface of the filter element to flow reversely; one side of the scraping and washing part, which is attached to the filter element, is provided with a siphon port, and a siphon channel which extends from the siphon port to a first sewage draining hole at the bottom of the bottle body is arranged in the scraping and washing part; the siphon channel is connected when the wiping part rotates around the filter element in a first rotation direction.

Through adjusting positive and negative washing switching piece and scraping and washing portion, this leading filter washes conversion equipment has following two kind at least filter core cleaning methods, and the first hole of decontaminating of body bottom is in the open mode under every cleaning method: the valve head is kept in a working state, namely a raw water filtering state, at the moment, fluid serving as cleaning liquid flows inwards along the outside of the filter element and washes the filter element, and the first sewage discharge hole is in an open state, so that most of the fluid mainly flows downwards along the outside of the filter element and is finally discharged from the first sewage discharge hole to realize positive washing; and secondly, adjusting the forward and reverse flushing switching piece to enable the fluid flowing through the filtering surface of the filter element to reversely flow, enabling the fluid serving as cleaning fluid to flow outwards along the inside of the filter element and flush the filter element, finally discharging from the first sewage discharge hole to realize back flushing, meanwhile, enabling the scraping part to rotate around the periphery of the filter element in a first rotating direction, enabling the siphon channel to be communicated, and realizing scraping and siphoning.

To sum up, this leading filter washes conversion equipment is when wasing the filter core, and the different states through positive and negative washing switching piece and scraping portion can make up out at least and just wash, scrape and wash and add siphon and back flush, scrape and wash and add two kinds of filter core cleaning methods of siphon, and these two kinds of filter core cleaning methods can the combined use, also can single use, and its cleaning performance is good and the selectivity of cleaning method is high.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a pre-filter flush switch apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a pre-filter flushing switch device provided in an embodiment of the present invention in an operating state;

FIG. 3 is a schematic structural diagram of a pre-filter flushing switch device in a positive flushing and scraping state according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a pre-filter flushing conversion device provided by an embodiment of the invention in a back-flushing state and a scraping state;

FIG. 5 is a schematic structural diagram of a pre-filter flush transition arrangement in positive flush, siphon and scrape states in accordance with an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a pre-filter flush switch assembly according to an embodiment of the present invention in a back flush, siphon, and scrape condition;

FIG. 7 is a schematic structural diagram of a valve head provided in an embodiment of the present invention;

FIG. 8 is a cross-sectional view of a valve head provided in accordance with an embodiment of the present invention;

FIG. 9 is a schematic structural view of a scraping and washing section according to an embodiment of the present invention;

FIG. 10 is an exploded view of the bracket and the aspiration tube after assembly in accordance with an embodiment of the present invention;

FIG. 11 is a bottom view of the bracket of FIG. 9;

fig. 12 is a schematic structural diagram of a conversion cover according to an embodiment of the present invention;

FIG. 13 is a partial schematic view of a first bracket and a conversion cover after assembly in accordance with an embodiment of the present invention;

FIG. 14 is a partial schematic view of a second bracket and a transition cover assembled according to an embodiment of the invention;

FIG. 15 is a schematic structural diagram of a forward/reverse flushing switch according to an embodiment of the present invention;

FIG. 16 is a cross-sectional view of a front-to-back flush switch according to an embodiment of the present invention.

Wherein, 1-valve head, 11-water inlet, 12-water outlet, 13-angle limiting part, 14-valve head positioning hole, 2-bottle body, 21-first sewage discharge hole, 3-filter element, 4-positive and negative flushing switching piece, 41-water inlet, 42-water outlet, 43-raw water inlet, 44-first sealing groove, 45-switching piece fixing column, 46-switching piece positioning column, 47-second sealing groove, 5-scraping part, 51-bracket, 511-fourth sewage discharge hole, 512-limiting block, 513-scraping pipe supporting column, 514-bracket positioning column, 515-fourth sealing groove, 52-scraping pipe, 521-siphon inlet, 522-scraping rib, 6-conversion cover, 61-third sewage discharge hole, 62-second sewage discharge hole, 2-first sealing groove, second sealing groove, and third sealing groove, 63-limiting clamping strip, 7-switching knob, 8-lower cover, 9-valve, 10-stop block, 101-sealing element, 1011-fifth sealing groove, 102-first sealing ring, 103-second sealing ring, 104-third sealing ring, 105-fourth sealing ring and 106-fifth sealing ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 16, fig. 1 is a schematic structural diagram of a pre-filter flushing conversion device according to an embodiment of the present invention; FIG. 2 is a schematic structural diagram of a pre-filter flushing switch device provided in an embodiment of the present invention in an operating state; FIG. 3 is a schematic structural diagram of a pre-filter flushing switch device in a positive flushing and scraping state according to an embodiment of the present invention; FIG. 4 is a schematic structural diagram of a pre-filter flushing conversion device provided by an embodiment of the invention in a back-flushing state and a scraping state; FIG. 5 is a schematic structural diagram of a pre-filter flush transition arrangement in positive flush, siphon and scrape states in accordance with an embodiment of the present invention; FIG. 6 is a schematic structural diagram of a pre-filter flush switch assembly according to an embodiment of the present invention in a back flush, siphon, and scrape condition; FIG. 7 is a schematic structural diagram of a valve head provided in an embodiment of the present invention; FIG. 8 is a cross-sectional view of a valve head provided in accordance with an embodiment of the present invention; FIG. 9 is a schematic structural view of a scraping and washing section according to an embodiment of the present invention; FIG. 10 is an exploded view of the bracket and the aspiration tube after assembly in accordance with an embodiment of the present invention; FIG. 11 is a bottom view of the bracket of FIG. 9; fig. 12 is a schematic structural diagram of a conversion cover according to an embodiment of the present invention; FIG. 13 is a partial schematic view of a first bracket and a conversion cover after assembly in accordance with an embodiment of the present invention; FIG. 14 is a partial schematic view of a second bracket and a transition cover assembled according to an embodiment of the invention; FIG. 15 is a schematic structural diagram of a forward/reverse flushing switch according to an embodiment of the present invention; FIG. 16 is a cross-sectional view of a front-to-back flush switch according to an embodiment of the present invention.

The invention provides a front filter flushing conversion device which comprises a front and back flushing switching piece 4 arranged in a valve head 1 of a front filter and a scraping and washing part 5 which is connected with a bottle body 2 of the front filter and is attached to the periphery of a filter element 3 in the bottle body 2 to rotate.

The forward and reverse flushing switching piece 4 is rotationally connected with the valve head 1; one side of the scraping and washing part 5, which is attached to the filter element 3, is provided with a siphon port 521, and a siphon channel which extends from the siphon port 521 to the first sewage draining hole 21 at the bottom of the bottle body 2 is arranged in the scraping and washing part 5; the siphon channel is connected when the scraper 5 rotates in a first direction of rotation about the filter insert 3.

The valve head 1 of the prefilter is used for feeding raw water into the bottle body 2 and the filter element 3, and the raw water is filtered by the filter element 3 and then flows out of the valve head 1. When the pre-filter flushing conversion device comprising the pre-filter is in a working state, raw water flows into the space between the bottle body 2 and the filter element 3 from the valve head 1 and then flows downwards, and the raw water is filtered by the filter cartridge in the flowing process, enters the filter cartridge, and finally flows to the valve head 1 from the filter cartridge and flows out. In the cleaning process, the first drain hole 21 formed in the bottom of the body 2 is opened by the valve 9 mounted in the bottom of the body 2, and the fluid as the cleaning liquid is discharged from the first drain hole 21.

In the first embodiment provided by the present application, the forward/reverse flushing switch 4 is disposed in the valve head 1 for reversing the direction of fluid flow through the filter surface of the filter cartridge in the operating state, i.e., adjusting the forward/reverse flushing switch 4 enables two opposite directions of fluid flow from the outside of the filter element 3 to the inside of the filter element 3 and from the inside of the filter element 3 to the outside of the filter element 3.

When the forward and backward flushing switch 4 makes the fluid flow from the outside of the filter element 3 to the inside of the filter element 3, the flow direction of the fluid flowing from the valve head 1 is similar to that of the raw water in the working state, and certainly, because the first drain hole 21 at the bottom of the bottle body 2 is opened, the fluid does not need to flow back to the valve head 1 from the inside of the filter element 3, therefore, most of the fluid flowing between the bottle body 2 and the filter element 3 directly flows downwards along the outer wall of the filter element 3, and the forward flushing is realized. When the forward/reverse flushing switch 4 is in a state where fluid flows from the inside of the filter element 3 to the outside of the filter element 3, the fluid flowing from the valve head 1 first enters the inside of the filter element 3 and then flows from the inside of the filter element 3 to the outside of the filter element 3, and the flow direction of the fluid flowing through the filter surface is opposite to the flow direction in the forward flushing state, and therefore, the forward/reverse flushing is called as reverse flushing.

To the setting of positive and negative washing switching piece 4, it is different according to the inside cavity structure of different leading filters, and its specific setting form is various. For the pre-filter applied in the application, the main difference is that the fluid introduced into the valve head 1 during the positive flushing firstly enters between the bottle body 2 and the filter element 3, and the fluid enters the filter element 3 during the back flushing, and the effect can be realized by arranging a part with the functions of cut-off and connection between the valve head 1 and the filter element 3, when the part cuts off the valve head 1 and the filter element 3, the fluid can only flow downwards between the bottle body 2 and the filter element 3; when the component is communicated with the valve head 1 and the filter element 3, the fluid directly enters the interior of the filter element 3 and then flows downwards.

Since the prior art partial prefilter has a specific arrangement of components having the same or similar functions as those of the forward/reverse flushing switch 4, the structure of the forward/reverse flushing switch 4 in this embodiment will not be described in detail.

In the first embodiment, the scraping and washing part 5 is connected to one end of the bottle body 2 far away from the valve head 1 and is used for rotating along the periphery of the filter element 3; the scraping and washing part 5 is positioned between the bottle body 2 and the filter element 3, one side of the scraping and washing part 5, which is attached to the filter element 3, is provided with a siphon port 521, and a siphon channel which extends from the siphon port 521 to the first sewage discharge hole 21 at the bottom of the bottle body 2 is arranged in the scraping and washing part 5; the siphon channel is connected when the scraper 5 rotates in a first direction of rotation about the filter insert 3.

The scraping and washing part 5 is attached to the periphery of the filter element 3 to rotate, and the power can be provided through manual operation or the scraping and washing part 5 can be driven to rotate through power equipment. When the scraping and washing part 5 rotates more than one round along the periphery of the filter element 3, the scraping and washing part 5 applies force to the whole periphery of the filter element 3, and can scrape off the slag attached to the filter element 3.

The first rotation direction of the scraping and washing part 5 can be regarded as counterclockwise rotation, that is, when the scraping and washing part 5 rotates counterclockwise, the siphon channel inside the scraping and washing part 5 is communicated with the first drain hole 21, the siphon port 521 generates siphon effect on the slag attached to the filter element 3, and the slag enters the siphon channel through the siphon port 521 and is finally discharged along the first drain hole 21.

In this embodiment, the present application does not limit the on-off state of the siphon channel in the reverse direction of the first rotation direction, that is, in the clockwise direction, that is, when the scraping and washing part 5 rotates clockwise, the scraping and washing part 5 can always function to scrape and wash the filter element 3 regardless of whether the siphon channel is connected or not. To sum up, under two kinds of specific operating condition and the combination of scraping and washing portion 5 of positive and negative washing switching piece 4, the leading filter that this application provided washes conversion equipment can realize "just washing + scraping + siphon" and "back flush + scraping + siphon" two kinds of different washing modes at least, and these two cleaning modes no matter are single use or combined use, and the homoenergetic can show the cleaning performance who improves filter core 3.

On the basis of the first embodiment, in order to provide more clean modes to be applicable to the prefilter under different work occasions, the siphon channel is not connected when scraping and washing portion 5 of this application rotates with the reverse direction of first direction of rotation, that is, when scraping and washing portion 5 rotates clockwise around filter element 3, because the siphon channel is not connected, siphon mouth 521 does not play the siphon effect, and scraping and washing portion 5 only plays the scraping and washing effect to the periphery of filter element 3. In combination with the two working states of the forward and reverse flushing switching member 4 in the first embodiment, the present application provides two cleaning manners, namely "forward flushing + siphon + scraping" and "back flushing + siphon + scraping", in addition to two cleaning manners, so that the forward filter flushing switching device provided by the present application can realize the four cleaning manners with different cleaning capabilities.

The valve head 1 has a water inlet 11 and a water outlet 12. The water inlet 11 of the valve head 1 is used for raw water to enter in a working state and is used for fluid serving as cleaning fluid to enter in a state of cleaning the filter element 3; the water outlet 12 of the valve head 1 is used for supplying raw water to flow out after being filtered by the filter element 3 in a working state, and in a state of cleaning the filter element 3, because the first drain hole 21 at the bottom of the bottle body 2 is opened and is influenced by self weight, fluid as cleaning liquid can not flow out from the water outlet 12 but flows out from the first drain hole 21.

On this basis, the positive and negative flushing switch 4 has a water inlet 41, and in order to satisfy the normal work of the pre-filter flushing conversion device, the positive and negative flushing switch 4 is further provided with a water outlet 42, and the water outlet 42 coincides with the water outlet 12 in the working state, so that the raw water can flow out after being filtered. In the working state, the raw water flows in from the channel between the bottle body 2 and the filter element 3 and cannot flow into the water inlet 41 from the water inlet 11, and at the moment, the water inlet 41 and the water inlet 11 are not overlapped necessarily. That is, when the water outlet 42 coincides with the water outlet 12, the water inlet 41 does not coincide with the water inlet 11, for realizing filtering and forward washing; when the water inlet 41 coincides with the water inlet 11, the water outlet 42 does not coincide with the water outlet 12, thereby realizing backwashing.

The positive and negative flushing switch 4 is arranged in the valve head 1 and communicated with the end part of the filter element 3, and fluid entering the positive and negative flushing switch 4 flows into the filter element 3 from the end part of the filter element 3. One of the positive and negative flushing switch 4 and the valve head 1 is fixed relative to the bottle body 2 and the filter element 3 in the bottle body 2, and the other rotates relative to the bottle body 2 and the filter element 3 in the bottle body 2.

Through rotating valve head 1 and positive and negative washing among the switching piece 4 can pivoted one, make the inlet opening 41 of positive and negative washing switching piece 4 coincide with the water inlet 11 of valve head 1, and the apopore 42 of positive and negative washing switching piece 4 does not coincide with the delivery port 12 of valve head 1, the passageway between body 2 and the filter core 3 is blocked by dog 10 this moment, also can't flow from delivery port 12, consequently, the fluid that gets into by water inlet 11 can not flow into between body 2 and the filter core 3 from the passageway, but flows into inside the filter core 3 from inlet opening 41, and then realize the back flush. Wherein, the stop block 10 is fixedly connected with the periphery of the forward and backward washing switching piece 4 and is arranged adjacent to the water inlet 41.

Through rotating among valve head 1 and the positive and negative switch part 4 that washes, make the inlet opening 41 of positive and negative switch part 4 and the water inlet 11 of valve head 1 misaligned, the passageway is opened this moment, and the fluid that gets into by water inlet 11 flows into between body 2 and filter core 3 along the passageway, and then realizes just washing. In this state, the water outlet 42 of the forward/reverse flushing switch 4 coincides with the water outlet 12 of the valve head 1, and although the fluid as the cleaning liquid flows out from the first drain hole 21 during the forward flushing, the raw water is filtered by the filter element 3 and then flows out from the water outlet 42 and the water outlet 12 because the first drain hole 21 is blocked during the operation.

On the basis of the foregoing, according to the specific structure of the prefilter to which the present application is applied, the forward-reverse flushing switch 4 includes a cylindrical pipe body for coaxial connection with the filter element 3 having an annular end portion. The tube-shape body rotates with filter core 3 and is connected, and the axis of rotation of tube-shape body and the center pin coincidence of filter core 3, inlet opening 41 and apopore 42 all set up in the section of thick bamboo wall of tube-shape body, and the cavity and the filter core 3 intercommunication of tube-shape body inside.

After the water inlet 41 and the water inlet 11 are overlapped, the fluid flowing from the water inlet 11 flows into the cavity of the cylindrical pipe body from the water inlet 41 and then flows into the filter element 3 from the cavity of the cylindrical pipe body, and the fluid in the filter element 3 flows out of the filter element 3 because the water outlet 12 is blocked, so that the back washing and scraping and siphoning are realized. After the water outlet 42 coincides with the water outlet 12, because the water inlet 11 does not coincide with the water inlet 41, the fluid flowing in from the water inlet 11 flows between the bottle body 2 and the filter element 3, although the water outlet 42 and the water outlet 12 are opened due to coincidence, most of the fluid between the bottle body 2 and the filter element 3 directly flows downwards to the first drain hole 21 along the periphery of the filter element 3 in a state that the first drain hole 21 is opened, and then the positive flushing and scraping and siphoning are realized.

A raw water inlet 43 can be arranged on one side of the wall of the tubular pipe body, a channel between the bottle body 2 and the filter element 3 is communicated with the raw water inlet 43, and the raw water inlet 43 is not communicated with a cavity in the tubular pipe body.

Further, in order to rotate the cylindrical tube, an angle limiting portion 13 is arranged between the cylindrical tube and the bottle body 2, and a limiting angle of the angle limiting portion 13 is equal to an included angle between the water inlet hole 41 and the water outlet hole 42. For example, the bottom of tube-shape body rotates to be connected in the top of filter core 3, the tube-shape body is established to the inside cavity cover of valve head 1, the cavity top surface of valve head 1 be equipped with one section with be used for supplying positive and negative switching piece top switch piece reference column 46 male arc constant head tank, and the central angle of this arc constant head tank equals 90, in other words, the switching piece reference column 46 that inserts this arc constant head tank can only rotate 90 along this arc constant head tank, correspondingly, inlet opening 41 also sets up to 90 with the contained angle of apopore 42. It should be noted that, since the forward/reverse flushing switch 4 and the valve head 1 are already in a relative rotation relationship, and the valve head 1 is fixed relative to the bottle body 2 and the filter element 3, for convenience of description, the angle limiting portion 13 is defined as being disposed between the filter element 3 and the cylindrical tube body, that is, between the valve head 1 and the cylindrical tube body. Similarly, the angle stopper 13 may be provided between the tubular body and the bottle body 2, and the actual angle stopper effect is the same.

In order to rotate the cylindrical pipe body conveniently, the upper end of the cylindrical pipe body is further fixed with a switching knob 7, one end of the switching knob 7 is fixed with a switching piece fixing column 45 on the upper end face of the cylindrical pipe body, the other end of the switching knob 7 penetrates through a valve head positioning hole 14 in the top end of the valve head 1 and extends to the outside of the valve head 1, and an operator rotates the cylindrical pipe body by rotating the switching knob 7.

In the second pre-filter flushing conversion device provided by the application, the scraping and washing part 5 arranged between the inner wall of the bottle body 2 and the periphery of the filter element 3 is close to the filter element 3, so that the clearance between the scraping and washing part 5 and the inner wall of the bottle body 2 is larger in order to reduce the friction resistance between the scraping and washing part 5 and the inner wall of the bottle body 2; the scraping and washing part 5 is provided with a scraping and washing rib 522 on one side departing from the filter element 3, namely close to the inner wall of the bottle body 2 except that one side attached with the filter element 3 is provided with a siphon mouth 521, and the scraping and washing rib 522 is protruded towards the inner wall of the bottle body 2. Scraping portion 5 only scrapes the contact of washing muscle 522 and 2 inner walls of body, plays the effect of scraping 2 inner walls of body, scrapes the position and the 2 intervals of body outside the washing muscle 522, avoids increasing frictional resistance.

Scrape one side extrusion filter core 3 that washes portion 5 is close to filter core 3, when scraping and washing portion 5 and rotating around the 3 peripheries of filter core, scrape and wash portion 5 and play the effect of scraping to the sediment matter that adheres to filter core 3, and scrape and wash the effect that muscle 522 played the scraping to 2 inner walls of body. That is to say, in the second embodiment provided in the present application, the scraping and washing portion 5 can wash not only the filter cylinder, but also the inner wall of the bottle body 2, so as to further improve the cleaning effect of the pre-filter.

For the specific arrangement of the scraping rib 522, a strip-shaped bump may be provided. The thickness of rectangular form lug for scraping 5 place planes is greater than the clearance between scraping 5 and the 2 inner walls of body of bottle to realize extrudeing 2 inner walls of body of bottle, and then scrape 2 inner walls of body of bottle when rotatory. The length direction of the long-strip-shaped convex block is parallel to the length direction of the bottle body 2, the front filter flushing and converting device is vertically placed, and then the long-strip-shaped convex block extends along the vertical direction.

The third pre-filter flushing switch unit has a scraper 5 comprising a bracket 51 and a scraper tube 52 fixed above the bracket 51. The bracket 51 is attached to the bottom end of the filter element 3, and when the bracket 51 is rotated, the scraping and washing pipe 52 rotates around the periphery of the filter element 3. The siphon mouth 521 and the siphon pipeline are arranged in the scraping and washing pipe 52, one side of the scraping and washing pipe 52 close to the filter element 3 is close to the filter element 3, when the siphon channel is communicated, the scraping and washing pipe 52 scrapes the filter element 3, meanwhile, the siphon mouth 521 has a siphon effect on the slag attached to the filter element 3, and the slag sucked into the siphon mouth 521 reaches the first sewage discharge hole 21 along the siphon channel and is discharged. When the siphon path is not opened, the scraping and washing pipe 52 scrapes the filter element 3, and the scraped residue flows toward the first drain hole 21 at the bottom of the body 2 along with the fluid and is discharged.

Considering the acting force between the scraping and washing pipe 52 and the filter element 3 and the siphon effect of the siphon opening 521, the scraping and washing pipe 52 comprises a first scraping and washing pipe and a second scraping and washing pipe, and when the scraping and washing part 5 is assembled with the filter element 3, the first scraping and washing pipe and the second scraping and washing pipe are symmetrically arranged at two sides of the filter element 3 by taking the axis of the filter element 3 as a symmetry axis. The first washing pipe of scraping is used for laminating the latter half of filter core 3, and the second washing pipe of scraping is used for laminating the first half of filter core 3, that is to say, first washing pipe and second are scraped and are washed the pipe and also are less than the axial length of filter core 3 along the axial length of filter core 3.

On the one hand, be located the first washing pipe and the second of filter core 3 both sides and scrape the atress that washes the pipe and can balance filter core 3 when rotating, on the other hand receives the restriction of first washing pipe and second washing pipe length of scraping, and the quantity and/or the size of the siphon mouth 521 of first washing pipe are limited, and similarly, the quantity and/or the size of the siphon mouth 521 of second washing pipe are limited, avoid influencing the siphon effort when realizing the siphon effect. Briefly, the siphon opening 521 and the siphon channel do not have the obvious siphon effect on the residue attached to the filter element 3 along with the larger number and the larger size of the siphon opening 521, and the acting force and the siphon effect of the scraping and washing pipe 52 on the filter element 3 are comprehensively considered in the scheme adopted by the third specific embodiment of the application, so that the loss of phase is avoided.

In order to avoid damage to the filter insert 3, the scraper tube 52 can be provided as a silicone tube. On this basis, the fixed silicone tube of support 51 accessible is scraped and is washed a tub pillar 513, guarantees that the silicone tube laminates in filter core 3 all the time, certainly, in order to connect siphon passageway and the first hole 21 of decontaminating in the silica gel, scrapes and wash the inside lumen that is the same with the siphon passageway that is equipped with of tub pillar 513 to introduce the first hole 21 of decontaminating with fluid and the sediment in the siphon passageway.

In order to avoid radial movement of the filter element 3 arranged in the middle of all the scraping and washing pipe support columns 513, the support 51 is provided with a plurality of support positioning columns 514 which are distributed in an annular array by taking the center of the support 51 as a midpoint, and the bottom surface of the filter element 3 is provided with an installation circular ring; all the support positioning columns 514 inserted into the mounting ring rotate along the channel of the mounting ring, so that the filter element 3 and the support 51 rotate relatively.

On the basis of any of the above embodiments, the present application further provides a fourth pre-filter flushing conversion device, in this embodiment, the lower end surface of the scraping and washing part 5 is rotatably connected to the filter element 3 through the conversion cover 6, the siphon channel in the scraping and washing part 5 is communicated with the first drain hole 21 at the bottom of the bottle body 2 through the second drain hole 62 of the conversion cover 6, in two cleaning modes of "forward flushing + scraping + siphon" and "back flushing + scraping + siphon", the slag matter sucked by the siphon port 521 and the slag matter scraped by the scraping and washing part 5 and sucked by the siphon port 521 flow to the second drain hole 62 along the siphon channel and then flow to the first drain hole 21 through the second drain hole 62 and flow out.

Further, the conversion cover 6 is also provided with a third sewage draining hole 61 communicated with the second sewage draining hole 62, and the third sewage draining hole 61 is arranged above the second sewage draining hole 62; the bottom end of the scraping and washing part 5 is provided with a fourth sewage draining hole 511. When the scraping and washing part 5 rotates towards the first rotating direction, the fourth sewage discharge hole 511 is disconnected from the third sewage discharge hole 61, fluid and slag which flow to the bottom of the scraping and washing part 5 cannot enter the second sewage discharge hole 62 through the fourth sewage discharge hole 511 and the third sewage discharge hole 61, so that the siphon channel is communicated with the second sewage discharge hole 62, the scraping and washing part 5 has a siphon effect on the filter element 3, and the sucked fluid and slag flow to the first sewage discharge hole 21 along the siphon channel and the second sewage discharge hole 62 and then flow out. When the scraping and washing part 5 rotates towards the second rotation direction, the fourth soil discharge hole 511 is communicated with the third soil discharge hole 61, the fluid and the slag flowing to the bottom of the scraping and washing part 5 directly enter the second soil discharge hole 62 through the fourth soil discharge hole 511 and the third soil discharge hole 61, at this time, the siphon suction port 521 cannot generate siphon action force on the slag attached to the filter element 3, and the fluid and the slag cannot flow to the second soil discharge hole 62 through the siphon channel.

The connection and disconnection of the fourth sewage draining hole 511 and the third sewage draining hole 61 can be realized by two parallel spaced limiting blocks 512 at the middle part of the lower end surface of the scraping and washing part 5 and a limiting clamping strip 63 at the middle part of the upper end surface of the conversion cover. The limiting clamping strip 63 is embedded between the two limiting blocks 512, a limited rotation range is provided between the two limiting blocks 512, and two limited relative rotation angles also exist, and the two limited relative rotation angles respectively correspond to the connection and disconnection of the fourth sewage discharge hole 511 and the third sewage discharge hole 61.

For example, the limiting block 512 includes a first limiting block and a second limiting block, and both sides of the limiting clip strip 63 reach a limited relative rotation angle when contacting with the first limiting block and the second limiting block, respectively. As shown in fig. 13, when the limiting clamping strip 63 rotates in the first rotation direction, the first side of the limiting clamping strip 63 abuts against the first limiting block, the second side of the limiting clamping strip 63 abuts against the second limiting block, at this time, the limiting clamping strip 63 and the two limiting blocks 512 are at the first angle, the fourth sewage hole 511 and the third sewage hole 61 are disconnected, the scraping and washing part 5 continues to rotate in the first rotation direction, the fourth sewage hole 511 and the third sewage hole 61 are always kept in the disconnected state, and accordingly, the siphon channel is always connected with the second sewage hole 62 and the first sewage hole 21. As shown in fig. 14, when the limiting clamping strip 63 rotates in the second rotation direction, the second side of the limiting clamping strip 63 abuts against the first limiting block, the first side of the limiting clamping strip 63 abuts against the second limiting block, at this time, the limiting clamping strip 63 and the two limiting blocks 512 are at the second angle, the fourth sewage discharge hole 511 is communicated with the third sewage discharge hole 61, the scraping and washing part 5 continues to rotate in the second rotation direction, the fourth sewage discharge hole 511 and the third sewage discharge hole 61 are always kept in a communicated state, accordingly, the siphon mouth 521 and the siphon channel cannot always generate siphon acting force on the slag attached to the filter element 3, and therefore, the siphon channel is equivalently kept in a disconnected state all the time.

It should be noted that the assembly structure in fig. 13 and 14 is a bottom view viewed from the bottom surface of the scraping section 5 upward, and the clockwise and counterclockwise directions in any of the embodiments of the present application are referred to in accordance with fig. 13 and 14, that is, the first rotation direction, i.e., counterclockwise in fig. 13 and 14, and the second rotation direction, i.e., clockwise in fig. 13 and 14. This orientation is defined to be adapted to the direction of rotation of the scraper 5 when the operator operates the pre-filter wash changer from the bottom thereof.

Further, in order to facilitate the operator to wash the rotating scraping part 5 from the bottom of the pre-filter washing conversion device, the bottom of the bottle body 2 is further provided with a sealing member 101 fixedly connected with the conversion cover 6 and a lower cover 8 sleeved and fixed on the periphery of the sealing member 101, and the lower cover 8 is rotatably connected with the bottom of the bottle body 2. The sealing element 101 and the conversion cover 6 are driven to rotate by the lower cover 8, and then the scraping and washing part 5 is driven to rotate by the conversion cover 6. Wherein, the bottom of body 2 can insert the upper end of lower cover 8 to realize the rotation of lower cover 8 and body 2 and be connected.

Because the pre-filter flushing conversion device is used for filtering raw water in a working state, in order to ensure the sealing effect, an O-shaped sealing ring and a sealing groove can be further arranged, for example, the forward and reverse flushing switching piece 4 is provided with a first sealing groove 44 and a second sealing groove 47, the first sealing groove 44 is arranged at the upper end of the forward and reverse flushing switching piece 4 and is used for embedding the first sealing ring 102; the second sealing groove 47 is disposed at the lower end of the forward/reverse flushing switch 4, and is used for embedding the second sealing ring 103. The upper end of body 2 is equipped with the third seal groove for supply the embedding of third sealing washer 104, thereby improve body 2 and valve head 1's sealing connection effect. The bottom end of the scraping part 5 is provided with a fourth sealing groove 515 for embedding the fourth sealing ring 105, thereby improving the sealing connection effect between the scraping part 5 and the conversion cover 6. The bottom end of the sealing element 101 is provided with a fifth sealing groove 1011 for embedding a fifth sealing ring 106, thereby improving the sealing connection effect between the sealing element 101 and the lower cover 8.

The application also provides a prefilter, which comprises any one of the above prefilter flushing conversion devices, and the structures of the valve head 1, the bottle body 2, the filter element 3 and the like of the prefilter can be arranged by referring to the related structures of the prefilter in the prior art, and are not described herein again. The flow direction of the raw water and the fluid as the cleaning fluid in the prefilter can refer to the direction indicated by the arrows in the drawings of part of the specification, and is not described herein.

The pre-filter and pre-filter flush switch provided by the present invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.