A pre-filter and a pre-filter flushing conversion device

Abstract

The present invention discloses a front filter flushing conversion device, which includes a positive and negative flushing switching member configured to be disposed in the valve head of the front filter and a scraping portion configured to be connected to the bottle body of the front filter and rotate around the outer periphery of the filter element inside the bottle body; the positive and negative flushing switching member is rotatably connected to the valve head to reverse the fluid flowing through the filtering surface of the filter element; a siphon port is provided on one side of the scraping portion that fits the filter element, and a siphon channel extending from the siphon port to the bottom of the bottle body and having a first sewage discharge hole is provided inside the scraping portion; the siphon channel is connected when the scraping portion rotates around the filter element in a first rotation direction. By adjusting the positive and negative flushing switching member to achieve the flow direction change of the fluid, and then combining the scraping and siphoning of the scraping portion to achieve the cleaning of the filter element, not only the selectivity of the cleaning method is expanded, but also the cleaning effect can be improved whether it is a single cleaning method or a combination of different cleaning methods. A front filter including the above front filter flushing conversion device is also disclosed.

Description

Technical Field

[0001] The present invention relates to the field of filters, and particularly to a front filter flushing conversion device. The present invention also relates to a front filter including the above front filter flushing conversion device. Background Art

[0002] After the existing front filter works for a long time, impurities carried in the raw water are embedded in the mesh holes of the filter element, which easily causes the filter element to be blocked. When cleaning the filter element, relatively clean water flow is passed through the front filter as a cleaning liquid, and the filter element is flushed with the cleaning liquid. This cleaning method is also called the forward flushing type cleaning method. When flushing with the forward flushing type cleaning method, the cleaning liquid flushes downward along the surface of the stainless steel mesh, and small particle impurities embedded in the mesh holes cannot be effectively flushed, resulting in blockage of the filter element. Therefore, small particle impurities intercepted on the mesh holes cannot be effectively flushed.

[0003] In summary, how to improve the cleaning effect of the front filter has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of the present invention is to provide a front filter flushing conversion device to improve the cleaning effect of the front filter and at the same time expand the selectivity of the cleaning method.

[0005] To achieve the above purpose, the present invention provides a front filter flushing conversion device, including:

[0006] A forward and reverse flushing switching member for being arranged in the valve head of the front filter; the forward and reverse flushing switching member is rotatably connected to the valve head to enable the fluid flowing through the filter surface of the filter element to flow reversely;

[0007] A scraping part for being connected to the bottle body of the front filter and rotating around the outer periphery of the filter element in the bottle body; a siphon port is arranged on one side of the scraping part that fits the filter element, and a siphon channel extending from the siphon port to the bottom of the bottle body is arranged in the scraping part; the siphon channel is connected when the scraping part rotates around the filter element in the first rotation direction.

[0008] Preferably, the valve head includes a water inlet and a water outlet; the forward and reverse flushing switching member communicated with the end of the filter element is provided with a water inlet hole for coinciding with the water inlet to achieve communication, a water outlet hole for coinciding with the water outlet to achieve communication, and a blocking block located below the water inlet hole for blocking the channel between the bottle body and the filter element;

[0009] One of the valve head and the forward and reverse flushing switching member rotates relative to the bottle body, and the other is fixed relative to the bottle body to achieve only one of the water inlet hole and the water outlet hole being communicated.

[0010] Preferably, the forward and reverse flushing switching member includes a cylindrical tube body coaxially arranged with the filter element; the cylindrical tube body is rotatably connected to the filter element and an angular limiting portion is provided therebetween; the water inlet hole and the water outlet hole are arranged on the cylindrical tube body, and the included angle between the water inlet hole and the water outlet hole is equal to the limiting angle of the angular limiting portion.

[0011] Preferably, on the side of the scraping portion facing away from the filter element, there is a scraping rib protruding towards the inner wall of the bottle body for scraping the inner wall; the length direction of the scraping rib is parallel to the length direction of the bottle body.

[0012] Preferably, the scraping portion includes a bracket arranged at the bottom and a scraping tube fixed above the bracket; the bracket fits against the bottom end of the filter element, and any one of the scraping tubes extends along the axis of the filter element; the siphon port extends along the length direction of the scraping tube.

[0013] Preferably, the scraping tube includes a first scraping tube for fitting against the lower half of the filter element and a second scraping tube for fitting against the upper half of the filter element, and the first scraping tube and the second scraping tube are symmetrical about the axis of the filter element.

[0014] Preferably, the lower end surface of the scraping portion is rotatably connected to the filter element through a conversion cover, and the siphon channel is communicated with the first sewage discharge hole through the second sewage discharge hole of the conversion cover.

[0015] Preferably, the conversion cover is provided with a third sewage discharge hole communicated with the second sewage discharge hole, and the third sewage discharge hole is arranged above the second sewage discharge hole;

[0016] The bottom end of the scraping portion is provided with a fourth sewage discharge hole for disconnecting from the third sewage discharge hole when the scraping portion rotates in the first rotation direction, and the fourth sewage discharge hole is communicated with the third sewage discharge hole when the scraping portion rotates in the second rotation direction.

[0017] Preferably, there are two parallel and spaced limiting blocks in the middle of the lower end surface of the scraping portion; in the middle of the upper end surface of the conversion cover, there is a limiting card strip for being embedded in the two limiting blocks;

[0018] When the limiting card strip rotating in the first rotation direction rotates to a first angle between the two limiting blocks, the fourth sewage discharge hole is disconnected from the third sewage discharge hole;

[0019] When the limiting card strip rotating in the second rotation direction rotates to a second angle between the two limiting blocks, the fourth sewage discharge hole is communicated with the third sewage discharge hole.

[0020] A pre-filter includes a valve head, a bottle body with one end connected to the valve head, and a filter element sleeved in the bottle body, and also includes the pre-filter flushing conversion device as described above.

[0021] Compared with the above background art, the front filter flushing conversion device provided by the present invention includes a positive and reverse flushing switching member for being arranged in the valve head of the front filter and a scraping part for being connected to the bottle body of the front filter and rotating along the outer periphery of the filter element in the bottle body.

[0022] The positive and reverse flushing switching member is rotatably connected to the valve head to enable the fluid flowing through the filter surface of the filter element to flow reversely; a siphon port is arranged on one side of the scraping part in contact with the filter element, and a siphon channel extending from the siphon port to the bottom of the bottle body and provided with a first sewage discharge hole is arranged in the scraping part; the siphon channel is connected when the scraping part rotates around the filter element in the first rotation direction.

[0023] By adjusting the positive and reverse flushing switching member and the scraping part, the front filter flushing conversion device has at least the following two filter element cleaning methods, and the first sewage discharge hole at the bottom of the bottle body is in an open state under each cleaning method: First, the positive and reverse flushing switching member keeps the valve head in a working state, that is, the state of filtering raw water. At this time, the fluid used as the cleaning liquid flows inward along the outside of the filter element and flushes the filter element. Since the first sewage discharge hole is in an open state, most of the fluid mainly flows downward along the outside of the filter element and finally discharges from the first sewage discharge hole to realize positive flushing. At the same time, the scraping part rotates around the outer periphery of the filter element in the first rotation direction, and the siphon channel is connected. In addition to scraping the filter element, the siphon port also plays a siphon role on the slag on the surface of the filter element; Second, the positive and reverse flushing switching member is adjusted to enable the fluid flowing through the filter surface of the filter element to flow reversely. At this time, the fluid used as the cleaning liquid flows outward along the inside of the filter element and flushes the filter element, and finally discharges from the first sewage discharge hole to realize reverse flushing. At the same time, the scraping part rotates around the outer periphery of the filter element in the first rotation direction, and the siphon channel is connected to realize scraping and siphoning.

[0024] In summary, when cleaning the filter element, the front filter flushing conversion device can at least combine two filter element cleaning methods of positive flushing, scraping plus siphoning and reverse flushing, scraping plus siphoning through different states of the positive and reverse flushing switching member and the scraping part. These two filter element cleaning methods can be used in combination or alone, and have good cleaning effect and high selectivity of cleaning methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0026] Figure 1 It is a structural schematic diagram of the front filter flushing conversion device provided by the embodiment of the present invention;

[0027] Figure 2 Schematic structural diagram of the pre-filter flushing conversion device provided by the embodiment of the present invention in the working state;

[0028] Figure 3 Schematic structural diagram of the pre-filter flushing conversion device provided by the embodiment of the present invention in the forward flushing and scraping states;

[0029] Figure 4 Schematic structural diagram of the pre-filter flushing conversion device provided by the embodiment of the present invention in the reverse flushing and scraping states;

[0030] Figure 5 Schematic structural diagram of the pre-filter flushing conversion device provided by the embodiment of the present invention in the forward flushing, siphon and scraping states;

[0031] Figure 6 Schematic structural diagram of the pre-filter flushing conversion device provided by the embodiment of the present invention in the reverse flushing, siphon and scraping states;

[0032] Figure 7 Schematic structural diagram of the valve head provided by the embodiment of the present invention;

[0033] Figure 8 Cross-sectional view of the valve head provided by the embodiment of the present invention;

[0034] Figure 9 Schematic structural diagram of the scraping part provided by the embodiment of the present invention;

[0035] Figure 10 Explosion schematic diagram of the assembled bracket and scraping pipe provided by the embodiment of the present invention;

[0036] Figure 11 is Figure 9 bottom view of the middle bracket;

[0037] Figure 12 Schematic structural diagram of the conversion cover provided by the embodiment of the present invention;

[0038] Figure 13 Partial schematic diagram of the assembled first bracket and conversion cover provided by the embodiment of the present invention;

[0039] Figure 14 Partial schematic diagram of the assembled second bracket and conversion cover provided by the embodiment of the present invention;

[0040] Figure 15 Schematic structural diagram of the forward and reverse flushing switching part provided by the embodiment of the present invention;

[0041] Figure 16 Cross-sectional view of the forward and reverse flushing switching part provided by the embodiment of the present invention.

[0042] Among them, 1 - valve head, 11 - water inlet, 12 - water outlet, 13 - angle limit part, 14 - valve head positioning hole, 2 - bottle body, 21 - first sewage discharge hole, 3 - filter element, 4 - positive and reverse flushing switching part, 41 - water inlet hole, 42 - water outlet hole, 43 - raw water inlet, 44 - first sealing groove, 45 - switching part fixing column, 46 - switching part positioning column, 47 - second sealing groove, 5 - scraping part, 51 - bracket, 511 - fourth sewage discharge hole, 512 - limit block, 513 - scraping pipe support column, 514 - bracket positioning column, 515 - fourth sealing groove, 52 - scraping pipe, 521 - siphon port, 522 - scraping rib, 6 - conversion cover, 61 - third sewage discharge hole, 62 - second sewage discharge hole, 63 - limit clamping strip, 7 - switching knob, 8 - lower cover, 9 - valve, 10 - stop block, 101 - seal, 1011 - fifth sealing groove, 102 - first sealing ring, 103 - second sealing ring, 104 - third sealing ring, 105 - fourth sealing ring, 106 - fifth sealing ring. Detailed implementation manners

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0044] In order to enable those skilled in the art of this technology to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0045] Please refer to Figures 1 to 16 , Figure 1 which is a schematic structural diagram of the pre-filter flushing conversion device provided by the embodiment of the present invention; Figure 2 which is a schematic structural diagram of the pre-filter flushing conversion device provided by the embodiment of the present invention in the working state; Figure 3 which is a schematic structural diagram of the pre-filter flushing conversion device provided by the embodiment of the present invention in the positive flushing and scraping states; Figure 4 which is a schematic structural diagram of the pre-filter flushing conversion device provided by the embodiment of the present invention in the reverse flushing and scraping states; Figure 5 which is a schematic structural diagram of the pre-filter flushing conversion device provided by the embodiment of the present invention in the positive flushing, siphon and scraping states; Figure 6 which is a schematic structural diagram of the pre-filter flushing conversion device provided by the embodiment of the present invention in the reverse flushing, siphon and scraping states; Figure 7 which is a schematic structural diagram of the valve head provided by the embodiment of the present invention;Figure 8 A cross-sectional view of the valve head provided by an embodiment of the present invention; Figure 9 A schematic structural view of the scraping and washing part provided by an embodiment of the present invention; Figure 10 An exploded schematic view of the bracket and the scraping and suction pipe after assembly provided by an embodiment of the present invention; Figure 11 is Figure 9 The bottom view of the middle bracket in Figure 12 A schematic structural view of the conversion cover provided by an embodiment of the present invention; Figure 13 A partial schematic view of the first bracket and the conversion cover after assembly provided by an embodiment of the present invention; Figure 14 A partial schematic view of the second bracket and the conversion cover after assembly provided by an embodiment of the present invention; Figure 15 A schematic structural view of the positive and negative flushing switching part provided by an embodiment of the present invention; Figure 16 A cross-sectional view of the positive and negative flushing switching part provided by an embodiment of the present invention.

[0046] The present invention provides a front filter flushing conversion device, which includes a positive and negative flushing switching part 4 arranged in the valve head 1 of the front filter and a scraping and washing part 5 connected to the bottle body 2 of the front filter and rotating around the outer periphery of the filter element 3 in the bottle body 2.

[0047] The positive and negative flushing switching part 4 is rotatably connected to the valve head 1; a siphon port 521 is provided on one side of the scraping and washing part 5 that fits the filter element 3, and a siphon channel extending from the siphon port 521 to the first sewage discharge hole 21 at the bottom of the bottle body 2 is provided in the scraping and washing part 5; the siphon channel is connected when the scraping and washing part 5 rotates around the filter element 3 in the first rotation direction.

[0048] It should be noted that the valve head 1 of the front filter is used to supply raw water into the bottle body 2 and the filter element 3, and make the raw water flow out of the valve head 1 after being filtered by the filter element 3. When the front filter flushing conversion device including the front filter is in the working state, the raw water flows into the valve head 1 and then flows downward between the bottle body 2 and the filter element 3. During the flowing process, the raw water is filtered by the filter cartridge, and then enters the filter cartridge, and finally flows from the filter cartridge to the valve head 1 and flows out. During the cleaning process, the first sewage discharge hole 21 at the bottom of the bottle body 2 is opened by the valve 9 installed at the bottom of the bottle body 2, and the fluid used as the cleaning liquid is discharged from the first sewage discharge hole 21.

[0049] In the first embodiment provided by the present application, the positive and negative flushing switching part 4 is arranged in the valve head 1 and is used to reverse the direction of the fluid flowing through the filter surface of the filter cartridge in the working state. In other words, adjusting the positive and negative flushing switching part 4 can realize two opposite flow directions: the fluid flows 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.

[0050] When the forward and reverse flushing switching member 4 makes the fluid flow from the outside of the filter element 3 to the inside of the filter element 3, the fluid flowing in from the valve head 1 is similar to the flow direction of the raw water in the working state. Of course, since the first sewage discharge hole 21 at the bottom of the bottle body 2 is opened, the fluid does not have to flow back from the inside of the filter element 3 to the valve head 1. Therefore, most of the fluid flowing between the bottle body 2 and the filter element 3 directly flows downward along the outer wall of the filter element 3 to achieve forward flushing. When the forward and reverse flushing switching member 4 makes the fluid flow from the inside of the filter element 3 to the outside of the filter element 3, the fluid flowing in 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. The flow direction of the fluid flowing through the filter surface in this state is opposite to the flow direction in the forward flushing state, so it is called reverse flushing.

[0051] Regarding the setting of the forward and reverse flushing switching member 4, according to the different cavity structures inside different pre-filters, its specific setting forms are diverse. For the pre-filter applied in this application, the main difference is that the fluid introduced into the valve head 1 in forward flushing first enters between the bottle body 2 and the filter element 3, while in reverse flushing, the fluid first enters the filter element 3. This effect can be achieved by setting components with truncating and connecting functions between the valve head 1 and the filter element 3. When the component truncates the valve head 1 and the filter element 3, the fluid can only flow downward between the bottle body 2 and the filter element 3; when the component connects the valve head 1 and the filter element 3, the fluid directly enters the inside of the filter element 3 and then flows downward.

[0052] Since there are specific setting forms of components in the prior art that have the same or similar functions as the forward and reverse flushing switching member 4, the structure of the forward and reverse flushing switching member 4 in this embodiment will not be described in detail.

[0053] In the first embodiment, the scraping part 5 is connected to one end of the bottle body 2 away from the valve head 1 and is used to rotate along the outer circumference of the filter element 3; the scraping part 5 is located between the bottle body 2 and the filter element 3. A siphon port 521 is provided on one side of the scraping part 5 that fits the filter element 3, and a siphon channel extending from the siphon port 521 to the first sewage discharge hole 21 at the bottom of the bottle body 2 is provided inside the scraping part 5; the siphon channel is connected when the scraping part 5 rotates around the filter element 3 in the first rotation direction.

[0054] The scraping part 5 rotates along the outer circumference of the filter element 3, and this power can be provided by manual operation or by driving the scraping part 5 to rotate through a power device. When the scraping part 5 rotates more than one week along the outer circumference of the filter element 3, the scraping part 5 applies force to the entire outer circumference of the filter element 3 and can scrape off the slag attached to the filter element 3.

[0055] The first rotation direction of the scraping part 5 can be regarded as counterclockwise rotation, that is, when the scraping part 5 rotates counterclockwise, the siphon channel inside the scraping part 5 is connected to the first sewage hole 21, and the siphon port 521 produces a siphon effect on the residue attached to the filter element 3. The residue enters the siphon channel through the siphon port 521 and is finally discharged along the first sewage hole 21.

[0056] In this embodiment, the present application does not limit the on / off state of the siphon channel when rotating in the reverse direction of the first rotation direction, that is, clockwise. That is to say, when the scraping part 5 rotates clockwise, regardless of whether the siphon channel is connected, the scraping part 5 can always scrape the filter element 3. In summary, under the combination of the two specific working states of the forward and reverse flushing switching member 4 and the scraping part 5, the pre-filter flushing conversion device provided by the present application can at least realize two different cleaning methods of "forward flushing + scraping + siphon" and "backwashing + scraping + siphon". These two cleaning methods can significantly improve the cleaning effect of the filter element 3 whether used alone or in combination.

[0057] On the basis of the first embodiment, in order to provide more cleaning methods suitable for pre-filters in different working occasions, the scraping part 5 of the present application does not connect the siphon channel when rotating in the reverse direction of the first rotation direction, that is, when the scraping part 5 rotates clockwise around the filter element 3, since the siphon channel is not connected, the siphon port 521 does not have a siphon effect, and the scraping part 5 only scrapes the periphery of the filter element 3. Combined with the two working states of the forward and reverse flushing switching member 4 in the first embodiment, in addition to the two cleaning methods of "forward flushing + siphon + scraping" and "backwashing + siphon + scraping", the present application also provides two cleaning methods of "forward flushing + scraping" and "backwashing + siphon". So far, the pre-filter flushing conversion device provided by the present application can realize the aforementioned four cleaning methods with different cleaning capabilities.

[0058] 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 the working state, and for fluid as cleaning liquid to enter in the state of cleaning the filter element 3; the water outlet 12 of the valve head 1 is used for raw water to flow out after being filtered by the filter element 3 in the working state, and in the state of cleaning the filter element 3, since the first drain hole 21 at the bottom of the bottle body 2 is open, under the influence of its own weight, the fluid as cleaning liquid will not flow out from the water outlet 12, but from the first drain hole 21.

[0059] On this basis, the forward and reverse flushing switching member 4 has a water inlet hole 41. To ensure the normal operation of the flushing conversion device of the pre-filter, the forward and reverse flushing switching member 4 is also provided with a water outlet hole 42. In the working state, the water outlet hole 42 coincides with the water outlet 12 for the filtered raw water to flow out. Since the raw water flows into the channel between the bottle body 2 and the filter element 3 in the working state and cannot flow into the water inlet hole 41 from the water inlet 11, the water inlet hole 41 and the water inlet 11 do not coincide at this time. That is to say, when the water outlet hole 42 coincides with the water outlet 12, the water inlet hole 41 does not coincide with the water inlet 11, which is used to realize filtration and forward flushing; when the water inlet hole 41 coincides with the water inlet 11, the water outlet hole 42 does not coincide with the water outlet 12, which is used to realize reverse flushing.

[0060] The forward and reverse flushing switching member 4 is arranged in the valve head 1 and communicated with the end of the filter element 3. The fluid entering the forward and reverse flushing switching member 4 flows into the filter element 3 from the end of the filter element 3. One of the forward and reverse flushing switching member 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.

[0061] By rotating the rotatable one of the valve head 1 and the forward and reverse flushing switching member 4, the water inlet hole 41 of the forward and reverse flushing switching member 4 coincides with the water inlet 11 of the valve head 1, and the water outlet hole 42 of the forward and reverse flushing switching member 4 does not coincide with the water outlet 12 of the valve head 1. At this time, the channel between the bottle body 2 and the filter element 3 is blocked by the block 10 and cannot flow out from the water outlet 12 either. Therefore, the fluid entering from the water inlet 11 will not flow into the channel between the bottle body 2 and the filter element 3, but will flow into the interior of the filter element 3 from the water inlet hole 41, thereby realizing reverse flushing. Among them, the block 10 is fixedly connected to the outer periphery of the forward and reverse flushing switching member 4 and is arranged adjacent to the water inlet hole 41.

[0062] By rotating the rotatable one of the valve head 1 and the forward and reverse flushing switching member 4, the water inlet hole 41 of the forward and reverse flushing switching member 4 does not coincide with the water inlet 11 of the valve head 1. At this time, the channel is open, and the fluid entering from the water inlet 11 flows along the channel into the space between the bottle body 2 and the filter element 3, thereby realizing forward flushing. In this state, the water outlet hole 42 of the forward and reverse flushing switching member 4 coincides with the water outlet 12 of the valve head 1. Although the cleaning fluid will flow out from the first sewage discharge hole 21 during the forward flushing process, during the working process, since the first sewage discharge hole 21 is blocked, the raw water will flow out from the water outlet hole 42 and the water outlet 12 after being filtered by the filter element 3.

[0063] On the basis of the above, according to the specific structure of the pre-filter applied in this application, the forward and reverse flushing switching member 4 includes a cylindrical tube body for coaxially connecting with the filter element 3 having an annular end. The cylindrical tube body is rotatably connected to the filter element 3, and the rotation axis of the cylindrical tube body coincides with the central axis of the filter element 3. The water inlet hole 41 and the water outlet hole 42 are both arranged on the tube wall of the cylindrical tube body, and the cavity inside the cylindrical tube body is communicated with the filter element 3.

[0064] After the water inlet hole 41 coincides with the water inlet 11, the fluid flowing in from the water inlet 11 flows into the cavity of the cylindrical tube body from the water inlet hole 41, and then flows from the cavity of the cylindrical tube body to the inside of the filter element 3. Since the water outlet 12 is blocked, the fluid inside the filter element 3 flows out to the outside of the filter element 3, thereby realizing "backwashing + scraping" and "backwashing + scraping + siphon". When the water outlet hole 42 coincides with the water outlet 12, since the water inlet 11 does not coincide with the water inlet hole 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 hole 42 and the water outlet 12 are opened due to coincidence, in the state where the first sewage discharge hole 21 is opened, most of the fluid between the bottle body 2 and the filter element 3 directly flows downward along the outer periphery of the filter element 3 to the first sewage discharge hole 21, thereby realizing "forward flushing + scraping" and "forward flushing + scraping + siphon".

[0065] A raw water inlet 43 can also be provided on one side of the cylindrical wall of the cylindrical tube body. The 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 the cavity inside the cylindrical tube body.

[0066] Furthermore, in order to facilitate the rotation of the cylindrical tube body, an angle limiting portion 13 is provided between the cylindrical tube body and the bottle body 2, and the limiting angle of the angle limiting portion 13 is equal to the included angle between the water inlet hole 41 and the water outlet hole 42. For example, the bottom end of the cylindrical tube body is rotatably connected to the top end of the filter element 3. The cavity inside the valve head 1 sleeves the cylindrical tube body. An arc-shaped positioning groove for inserting the switching member positioning column 46 at the top end of the positive and negative switching member is provided on the top surface of the cavity of the valve head 1, and the central angle of the arc-shaped positioning groove is equal to 90°. In other words, the switching member positioning column 46 inserted into the arc-shaped positioning groove can only rotate 90° along the arc-shaped positioning groove. Correspondingly, the included angle between the water inlet hole 41 and the water outlet hole 42 is also set to 90°. It should be noted that since there is already a relative rotation relationship between the positive and negative flushing switching member 4 and the valve head 1, and the valve head 1 is fixed relative to the bottle body 2 and the filter element 3, for the convenience of description, the angle limiting portion 13 is defined here as being provided between the filter element 3 and the cylindrical tube body, which is equivalent to being provided between the valve head 1 and the cylindrical tube body. Similarly, the angle limiting portion 13 can also be provided between the cylindrical tube body and the bottle body 2, and the actual angle limiting effect is the same.

[0067] In order to facilitate the rotation of the cylindrical tube body, a switching knob 7 is further fixed to the upper end of the cylindrical tube body. One end of the switching knob 7 is fixed to the switching member fixing column 45 on the upper end surface of the cylindrical tube body, and the other end passes through the valve head positioning hole 14 at the top end of the valve head 1 and extends to the outside of the valve head 1. The operator rotates the cylindrical tube body by rotating the switching knob 7.

[0068] In the second pre-filter flushing conversion device provided in this application, the scraping part 5 disposed between the inner wall of the bottle body 2 and the outer periphery of the filter element 3 is close to the filter element 3. To facilitate the rotation of the scraping part 5, the gap between the scraping part 5 and the inner wall of the bottle body 2 is relatively large to reduce the frictional resistance between the scraping part 5 and the inner wall of the bottle body 2. In addition to having a siphon port 521 on the side of the scraping part 5 that fits the filter element 3, there is a scraping rib 522 on the side of the scraping part 5 that faces away from the filter element 3, that is, close to the inner wall of the bottle body 2, and the scraping rib 522 protrudes towards the inner wall of the bottle body 2. The scraping part 5 only contacts the inner wall of the bottle body 2 through the scraping rib 522 to scrape the inner wall of the bottle body 2, and the parts other than the scraping rib 522 are spaced from the bottle body 2 to avoid increasing the frictional resistance.

[0069] One side of the scraping part 5 close to the filter element 3 presses the filter element 3. When the scraping part 5 rotates around the outer periphery of the filter element 3, the scraping part 5 has a scraping effect on the slag attached to the filter element 3, while the scraping rib 522 has a scraping effect on the inner wall of the bottle body 2. That is to say, in the second specific embodiment provided in this application, the scraping part 5 can not only clean the filter cartridge, but also clean the inner wall of the bottle body 2, further improving the cleaning effect of the pre-filter.

[0070] Regarding the specific setting of the scraping rib 522, a long strip-shaped convex block can be set. The thickness of the long strip-shaped convex block relative to the plane where the scraping part 5 is located is greater than the gap between the scraping part 5 and the inner wall of the bottle body 2 to achieve squeezing the inner wall of the bottle body 2, and then scraping the inner wall of the bottle body 2 during rotation. The length direction of the long strip-shaped convex block is parallel to the length direction of the bottle body 2. If the pre-filter flushing conversion device is placed vertically, the long strip-shaped convex block extends in the vertical direction.

[0071] The scraping part 5 of the third pre-filter flushing conversion device includes a bracket 51 and a scraping pipe 52 fixed above the bracket 51. The bracket 51 fits against the bottom end of the filter element 3. When the bracket 51 is rotated, the scraping pipe 52 rotates around the outer periphery of the filter element 3. The siphon port 521 and the siphon pipe are arranged in the scraping pipe 52. One side of the scraping pipe 52 close to the filter element 3 is close to the filter element 3. When the siphon channel is connected, while the scraping pipe 52 scrapes the filter element 3, the siphon port 521 has a siphoning effect on the slag attached to the filter element 3, and the slag sucked into the siphon port 521 reaches the first sewage discharge hole 21 along the siphon channel and is discharged. When the siphon channel is not connected, the scraping pipe 52 scrapes the filter element 3, and the scraped slag flows towards the first sewage discharge hole 21 at the bottom of the bottle body 2 with the fluid and is discharged.

[0072] Considering the force between the scraping and washing tube 52 and the filter element 3 and the siphon effect of the siphon port 521, the scraping and washing tube 52 includes a first scraping and washing tube and a second scraping and washing tube. When the scraping part 5 is assembled with the filter element 3, the first scraping and washing tube and the second scraping and washing tube are symmetrically arranged on both sides of the filter element 3 with the axis of the filter element 3 as the symmetry axis. The first scraping and washing tube is used to fit the lower half of the filter element 3, and the second scraping and washing tube is used to fit the upper half of the filter element 3. That is to say, the lengths of the first scraping and washing tube and the second scraping and washing tube along the axis of the filter element 3 are also less than the axial length of the filter element 3.

[0073] On the one hand, the first scraping and washing tube and the second scraping and washing tube located on both sides of the filter element 3 can balance the force on the filter element 3 when rotating. On the other hand, limited by the lengths of the first scraping and washing tube and the second scraping and washing tube, the number and / or size of the siphon ports 521 of the first scraping and washing tube are limited. Similarly, the number and / or size of the siphon ports 521 of the second scraping and washing tube are limited, so as to avoid affecting the siphon force while achieving the siphon effect. Simply put, the siphon effect of the siphon ports 521 and the siphon channels on the slag attached to the filter element 3 is not more obvious with the increase in the number and size of the siphon ports 521. The solution adopted in the third specific embodiment of the present application comprehensively considers the force of the scraping and washing tube 52 on the filter element 3 and the siphon effect, avoiding getting half and losing half.

[0074] To avoid damaging the filter element 3, the scraping and washing tube 52 can be set as a silica gel tube. On this basis, the bracket 51 can fix the silica gel tube through the scraping and washing tube support column 513 to ensure that the silica gel tube always fits on the filter element 3. Of course, in order to connect the siphon channel in the silica gel to the first sewage discharge hole 21, the scraping and washing tube support column 513 is internally provided with a tube cavity identical to the siphon channel, so as to introduce the fluid and slag in the siphon channel into the first sewage discharge hole 21.

[0075] To prevent the radial movement of the filter element 3 installed in the middle of all the scraping and washing tube support columns 513, the bracket 51 is provided with a plurality of bracket positioning columns 514 that are annularly arrayed with the center of the bracket 51 as the midpoint. The bottom surface of the filter element 3 is provided with a mounting ring; all the bracket positioning columns 514 inserted into the mounting ring rotate along the groove of the mounting ring to realize the relative rotation between the filter element 3 and the bracket 51.

[0076] 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 part 5 is rotatably connected to the filter element 3 through a conversion cover 6, and the siphon channel in the scraping part 5 is communicated with the first sewage discharge hole 21 at the bottom of the bottle body 2 through the second sewage discharge hole 62 of the conversion cover 6. In the two cleaning methods of "positive flushing + scraping + siphon" and "reverse flushing + scraping + siphon", the slag sucked by the siphon port 521 and the slag scraped by the scraping part 5 and sucked by the siphon port 521 flow along the siphon channel to the second sewage discharge hole 62, and then flow from the second sewage discharge hole 62 to the first sewage discharge hole 21 and flow out.

[0077] Further, the conversion cover 6 is further provided with a third sewage discharge hole 61 communicating with the second sewage discharge hole 62, and the third sewage discharge hole 61 is arranged above the second sewage discharge hole 62; the bottom end of the scraping part 5 is provided with a fourth sewage discharge hole 511. When the scraping part 5 rotates in the first rotation direction, the fourth sewage discharge hole 511 is disconnected from the third sewage discharge hole 61, and the fluid and slag flowing to the bottom of the scraping part 5 cannot enter the second sewage discharge hole 62 through the fourth sewage discharge hole 511 and the third sewage discharge hole 61. Therefore, the siphon channel is connected to the second sewage discharge hole 62, and the scraping part 5 generates a siphon effect on the filter element 3. The sucked fluid and slag flow along the siphon channel and the second sewage discharge hole 62 to the first sewage discharge hole 21 and then flow out. When the scraping part 5 rotates in the second rotation direction, the fourth sewage discharge hole 511 is connected to the third sewage discharge hole 61, and the fluid and slag flowing to the bottom of the scraping part 5 directly enter the second sewage discharge hole 62 through the fourth sewage discharge hole 511 and the third sewage discharge hole 61. At this time, the siphon port 521 cannot generate a siphon force on the slag attached to the filter element 3, and the fluid and slag will not flow to the second sewage discharge hole 62 through the siphon channel.

[0078] Regarding the connection and disconnection of the fourth sewage discharge hole 511 and the third sewage discharge hole 61, it can be realized by two parallel and spaced limiting blocks 512 in the middle of the lower end face of the scraping part 5 and a limiting strip 63 in the middle of the upper end face of the conversion cover. The limiting strip 63 is embedded between the two limiting blocks 512, and there is a limited rotation range between the two limiting blocks 512, and there are also two extreme relative rotation angles. These two extreme relative rotation angles respectively correspond to the connection and disconnection of the fourth sewage discharge hole 511 and the third sewage discharge hole 61.

[0079] For example, the limiting block 512 includes a first limiting block and a second limiting block, and the two sides of the limiting strip 63 reach the extreme relative rotation angles when they are in contact with the first limiting block and the second limiting block respectively. As Figure 13 shown, when the limiting strip 63 rotates in the first rotation direction, the first side of the limiting strip 63 abuts against the first limiting block and the second side abuts against the second limiting block. At this time, the limiting strip 63 and the two limiting blocks 512 are at a first angle, and the fourth sewage discharge hole 511 and the third sewage discharge hole 61 are disconnected. Continuing to rotate the scraping part 5 in the first rotation direction, the fourth sewage discharge hole 511 and the third sewage discharge hole 61 always remain disconnected, and correspondingly, the siphon channel is always connected to the second sewage discharge hole 62 and the first sewage discharge hole 21. As Figure 14As shown, when the limit card strip 63 rotates in the second rotation direction, the second side of the limit card strip 63 abuts against the first limit block and the first side abuts against the second limit block. At this time, the limit card strip 63 and the two limit blocks 512 are at a second angle, and the fourth sewage discharge hole 511 and the third sewage discharge hole 61 are connected. Continuing to rotate the scraping part 5 in the second rotation direction, the fourth sewage discharge hole 511 and the third sewage discharge hole 61 always remain connected. Correspondingly, the siphon port 521 and the siphon channel can never generate a siphon force on the slag attached to the filter element 3. Therefore, the siphon channel is equivalent to remaining disconnected all the time.

[0080] It should be noted that Figure 13 and Figure 14 the assembly structure in is a bottom-up perspective view of the scraping part 5. In any embodiment of the present application, the clockwise and counterclockwise directions are both in accordance with Figure 13 and Figure 14 as a reference. That is to say, the first rotation direction is also the Figure 13 and Figure 14 counterclockwise in, and the second rotation direction is also the Figure 13 and Figure 14 clockwise in. This definition of the direction is adapted to the rotation direction when the operator operates the scraping part 5 from the bottom of the pre-filter flushing conversion device.

[0081] Furthermore, in order to facilitate the operator to rotate the scraping part 5 from the bottom of the pre-filter flushing conversion device, a sealing member 101 fixedly connected to the conversion cover 6 and a lower cover 8 sleeved and fixed on the outer periphery of the sealing member 101 are also provided at the bottom of the bottle body 2. The lower cover 8 is rotatably connected to the bottom of the bottle body 2. The lower cover 8 drives the sealing member 101 and the conversion cover 6 to rotate, and further drives the scraping part 5 to rotate through the conversion cover 6. Among them, the bottom end of the bottle body 2 can be inserted into the upper end of the lower cover 8, so as to realize the rotational connection between the lower cover 8 and the bottle body 2.

[0082] Since the pre-filter flushing conversion device is used to filter raw water in the working state, in order to ensure the sealing effect, an O-ring seal and a sealing groove can also be provided. For example, the positive and negative flushing switching member 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 positive and negative flushing switching member 4 for the first sealing ring 102 to be embedded; the second sealing groove 47 is arranged at the lower end of the positive and negative flushing switching member 4 for the second sealing ring 103 to be embedded. The upper end of the bottle body 2 is provided with a third sealing groove for the third sealing ring 104 to be embedded, so as to improve the sealing connection effect between the bottle body 2 and the valve head 1. The bottom end of the scraping part 5 is provided with a fourth sealing groove 515 for the fourth sealing ring 105 to be embedded, so as to improve the sealing connection effect between the scraping part 5 and the conversion cover 6. The bottom end of the sealing member 101 is provided with a fifth sealing groove 1011 for the fifth sealing ring 106 to be embedded, so as to improve the sealing connection effect between the sealing member 101 and the lower cover 8.

[0083] The present application also provides a pre-filter, which includes any one of the above-mentioned pre-filter flushing conversion devices. The structures such as the valve head 1, the bottle body 2, and the filter element 3 of the pre-filter can be set with reference to the relevant structures of the pre-filter in the prior art, and will not be elaborated here. The flow directions of the raw water and the fluid used as the cleaning liquid in the pre-filter can be referred to the arrow directions in some of the specification drawings, and will not be described one by one here.

[0084] The above has introduced in detail the pre-filter and the pre-filter flushing conversion device provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A front filter flushing conversion device, characterized in that Comprising: A forward and reverse flushing switching member (4) configured to be disposed within the valve head (1) of a pre-filter; The forward and reverse flushing switching member (4) is rotatably connected to the valve head (1) to enable the fluid flowing through the filtration surface of the filter element (3) to flow reversely; A scraping portion (5) configured to be connected to the bottle body (2) of the pre-filter and rotatably fit around the outer periphery of the filter element (3) within the bottle body (2); A siphon port (521) is provided on one side of the scraping portion (5) that fits the filter element (3), and a siphon channel extending from the siphon port (521) to the bottom of the bottle body (2) through a first sewage discharge hole (21) is provided within the scraping portion (5); The siphon channel is connected when the scraping portion (5) rotates around the filter element (3) in a first rotation direction; The lower end surface of the scraping portion (5) is rotatably connected to the filter element (3) through a conversion cover (6), and the siphon channel is communicated with the first sewage discharge hole (21) through a second sewage discharge hole (62) of the conversion cover (6); The conversion cover (6) further has a third sewage discharge hole (61) communicated with the second sewage discharge hole (62), and the third sewage discharge hole (61) is provided above the second sewage discharge hole (62); A fourth sewage discharge hole (511) is provided at the bottom end of the scraping portion (5) for disconnecting from the third sewage discharge hole (61) when the scraping portion (5) rotates in the first rotation direction, and the fourth sewage discharge hole (511) is communicated with the third sewage discharge hole (61) when the scraping portion (5) rotates in a second rotation direction; Two parallel and spaced limiting blocks (512) are provided in the middle of the lower end surface of the scraping portion (5); A limiting card strip (63) for fitting into the two limiting blocks (512) is provided in the middle of the upper end surface of the conversion cover (6).

2. The pre-filter flushing conversion device according to claim 1, wherein, The valve head (1) includes a water inlet (11) and a water outlet (12); The forward and reverse flushing switching member (4) communicated with the end of the filter element (3) is provided with a water inlet hole (41) for coinciding with the water inlet (11) to achieve communication, a water outlet hole (42) for coinciding with the water outlet (12) to achieve communication, and a blocking block (10) located below the water inlet hole (41) for blocking the channel between the bottle body (2) and the filter element (3); One of the valve head (1) and the forward and reverse flushing switching member (4) rotates relative to the bottle body (2), and the other is fixed relative to the bottle body (2) to enable only one of the water inlet hole (41) and the water outlet hole (42) to be communicated.

3. The pre-filter flushing conversion device according to claim 2, characterized in that The forward and reverse flushing switching member (4) includes a cylindrical tube body coaxially arranged with the filter element (3); The cylindrical tube body is rotatably connected to the filter element (3) and an angular limiting portion (13) is provided therebetween; The water inlet hole (41) and the water outlet hole (42) are provided on the cylindrical tube body, and the included angle between the water inlet hole (41) and the water outlet hole (42) is equal to the limiting angle of the angular limiting portion (13).

4. The pre-filter flushing conversion device according to claim 1, characterized in that, A scraping rib (522) protruding towards the inner wall of the bottle body (2) for scraping the inner wall is provided on the side of the scraping portion (5) facing away from the filter element (3); The length direction of the scraping rib (522) is parallel to the length direction of the bottle body (2).

5. The pre-filter flushing conversion device according to claim 1, characterized in that, The scraping and washing part (5) includes a bracket (51) arranged at the bottom and a scraping and washing pipe (52) fixed above the bracket (51); the bracket (51) is attached to the bottom end of the filter element (3), and the scraping and washing pipe (52) extends along the axis of the filter element (3); the siphon port (521) extends along the length direction of the scraping and washing pipe (52).

6. The pre-filter flushing conversion device according to claim 5, characterized in that, The scraping and washing pipe (52) includes a first scraping and washing pipe for attaching to the lower half of the filter element (3) and a second scraping and washing pipe for attaching to the upper half of the filter element (3), and the first scraping and washing pipe and the second scraping and washing pipe are symmetrical about the axis of the filter element (3).

7. The pre-filter flushing conversion device according to claim 1, characterized in that When the limiting strip (63) rotating in the first rotation direction rotates to a first angle between the two limiting blocks (512), the fourth sewage discharge hole (511) is disconnected from the third sewage discharge hole (61). When the limiting strip (63) rotating in the second rotation 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).

8. A pre-filter, comprising a valve head (1), a bottle body (2) with one end connected to the valve head (1), and a filter element (3) sleeved in the bottle body (2), characterized in that, It also includes a pre-filter flushing conversion device according to any one of claims 1 to 7.

Images