Pre-filter

Abstract

The utility model belongs to the technical field of water treatment, and discloses a pre-filter. The pre-filter is provided with a backwashing port, the pre-filter comprises a valve head and a filter main body, the filter main body comprises a filter bottle, a filter cartridge, an inner rotating piece and a scraping and washing assembly, one end of the filter bottle is connected with the valve head, and the other end of the filter bottle is provided with a sewage draining exit; the filter cartridge is arranged in the filter bottle, and the backwashing opening can be communicated with the interior of the filter cartridge; the inner rotating part is rotationally arranged in the filter cartridge and can rotate under the driving of backwashing water flow; the scraping and washing assembly comprises an outer framework and a scraping and washing part arranged on the outer framework, the outer framework rotationally sleeves the filter cartridge, the scraping and washing part is used for scraping and washing the filter cartridge, an impeller is connected to one end, facing the sewage draining exit, of the outer framework, and the impeller can drive the outer framework to rotate under the driving of backwashing water flow. According to the pre-filter, the problems that the scraping and washing filter screen needs to be manually operated and the washing water flow of the back-washing filter screen is not uniformly distributed in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to water treatment technical field especially relates to a prefilter. BACKGROUND

[0002] The prefilter is the first rough filter equipment for the water of the whole house, can filter the silt, rust and large particle substance in the tap water, prevents the harm caused by the large amount of precipitated impurities in the city and community water supply pipe network to the human body, and plays the positive preprotection role to the buried pipeline, faucet, water heating, water heater, boiler, central air conditioner, washing machine, dish washer, coffee machine and other water household appliances (water purifier, pure water machine, soft water machine) etc.

[0003] However, the prefilter has the drawbacks of impurity accumulation on the filter screen and difficulty in discharging the accumulated impurities, and when pollution needs to be discharged, manual operation is usually required to move the scraping and washing part in the prefilter to achieve the cleaning effect by scraping and washing the filter screen, and automatic cleaning cannot be achieved.

[0004] Some prefilters are designed with backwashing function, which achieves the cleaning purpose by backwashing the filter screen with water flow, but the water flow is unevenly distributed and the washing effect is poor. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at providing a prefilter which can solve the problems of manual scraping and washing of the filter screen and uneven distribution of washing water flow of the backwashing filter screen.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A prefilter is provided with a backwashing port, and the prefilter comprises a valve head and a filter main body, and the filter main body comprises:

[0008] A filter bottle is connected to one end of the valve head, and the other end of the filter bottle is provided with a pollution discharge port;

[0009] A filter cartridge is arranged in the filter bottle, and the backwashing port can communicate with the inside of the filter cartridge;

[0010] An inner rotating part is rotationally arranged in the filter cartridge, and the inner rotating part can rotate under the driving of backwashing water flow;

[0011] A scraping and washing assembly comprises an outer skeleton and a scraping and washing part arranged on the outer skeleton, the outer skeleton is rotationally sleeved on the outside of the filter cartridge, the scraping and washing part is used for scraping and washing the filter cartridge, one end of the outer skeleton towards the pollution discharge port is connected with an impeller, and the impeller can drive the outer skeleton to rotate under the driving of backwashing water flow.

[0012] As an alternative to the above-mentioned pre-filter, the inner rotating member comprises a turbine, which is rotationally arranged in the filter cartridge.

[0013] As an alternative to the above-mentioned pre-filter, the turbine is arranged at one end of the filter cartridge close to the valve head.

[0014] As an alternative to the above-mentioned pre-filter, the filter body further comprises a central skeleton, which is movably arranged in the filter cartridge to open or close the backwashing port, and the inner rotating member is sleeved outside the central skeleton.

[0015] As an alternative to the above-mentioned pre-filter, the central skeleton comprises a first limiting portion, one end of the inner rotating member can abut against the first limiting portion, and the other end can abut against the filter cartridge.

[0016] As an alternative to the above-mentioned pre-filter, the impeller is integrally formed with the outer skeleton.

[0017] Alternatively, the impeller is in transmission cooperation with the outer skeleton.

[0018] As an alternative to the above-mentioned pre-filter, the filter body further comprises a base arranged in the filter bottle, the base is sealingly connected with the filter bottle, and a water outlet is arranged on the base.

[0019] The impeller is rotationally arranged on one side of the base facing the blowdown port.

[0020] As an alternative to the above-mentioned pre-filter, one of the outer skeleton and the impeller is provided with a plug-in portion, and the other is provided with a plug-in slot, and the plug-in portion is inserted into the plug-in slot.

[0021] And / or, the base is provided with a containing slot, and the impeller is located in the containing slot.

[0022] As an alternative to the above-mentioned pre-filter, the number of the scraping members is at least two, at least two of the scraping members are arranged in a circumferential direction of the outer skeleton, and adjacent two of the scraping members are arranged in an axial direction of the outer skeleton.

[0023] As an alternative to the above-mentioned pre-filter, the scraping member is made of an elastic material.

[0024] And / or, the scraping member is arranged through the outer skeleton, so that the scraping member can abut against the inner wall of the filter bottle and the outer wall of the filter cartridge, respectively.

[0025] And / or, the scraping member extends in a radial direction of the outer skeleton.

[0026] The utility model discloses a beneficial effect:

[0027] The utility model discloses a prefilter, and the inner rotating part can rotate around the axis of the filter cartridge under the driving action of the backwashing water flow, plays the function of disturbing flow, guides the spiral flow of backwashing water simultaneously, and flows to the filter cartridge evenly, improves the washing uniformity, and makes the washing effect better.

[0028] By setting up the impeller, using backwashing water flow as the driving source, realizing the rotation of the outer skeleton in the backwashing process, driving the scraping and washing part on the outer skeleton to scrape and wash the filter cartridge, further improving the cleaning effect on the filter cartridge, and without the manual operation of the user, also without the additional introduction of the driving source, simplifying the operation of the user, and reducing the cost. DRAWINGS

[0029] Figure 1 It is the structure schematic view of the prefilter provided by the utility model discloses;

[0030] Figure 2 It is the sectional view of the prefilter provided by the utility model discloses;

[0031] Figure 3 It is the structure schematic view of the scraping and washing subassembly provided by the utility model discloses;

[0032] Figure 4 It is the schematic view of part structure in the prefilter provided by the utility model discloses;

[0033] Figure 5 It is the sectional view of part structure in the prefilter provided by the utility model discloses;

[0034] Figure 6 It is the sectional view of the scraping and washing subassembly provided by the utility model discloses.

[0035] In the drawing:

[0036] 100, filter main body;10, filter bottle;20, filter cartridge;30, center skeleton;31, communication section;32, transition section;321, water outlet;33, cooperation section;34, limiting flange;40, inner rotating part;41, sleeve;42, turbine;50, scraping and washing subassembly;51, outer skeleton;52, scraping and washing part;521, outer scraping and washing part;522, inner scraping and washing part;523, clamping part;53, impeller;60, base;61, seat body;62, third sealing element;70, reset element;81, first sealing element;82, second sealing element;90, backwashing element;

[0037] 200, valve head;210, water inlet flow channel;220, water outlet flow channel;230, outer ring flange;240, inner ring flange;

[0038] 300, blowdown valve. DETAILED DESCRIPTION

[0039] The utility model will be described in further detail below in combination with the drawings and examples. It can be understood that the specific examples described herein are merely used to explain the utility model and not limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for the convenience of description, not all the structures.

[0040] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0041] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0042] In the description of the embodiment, the terms "upper", "lower", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in description and have no special meaning.

[0043] The embodiment provides a pre-filter, as shown in Figure 1 and Figure 2 As shown, it comprises a valve head 200 and a filter body 100, the valve head 200 is provided with a water inlet flow channel 210 and a water outlet flow channel 220; the filter body 100 comprises a filter bottle 10 and a filter cartridge 20 arranged in the filter bottle 10, the filter bottle 10 is connected with the valve head 200, an axial end of the filter cartridge 20 is provided with an open mouth, the open mouth is communicated with the water outlet flow channel 220, and the water inlet flow channel 210 is communicated with the annular gap between the filter cartridge 20 and the filter bottle 10.

[0044] In use, water enters the annular gap through the water inlet channel 210 and is filtered by passing through the filter cartridge 20; the filtered water enters the water outlet channel 220 from the filter cartridge 20, thereby achieving preliminary filtration.

[0045] With use of the pre-filter, impurities accumulate on the outer circumferential surface of the filter cartridge 20, affecting the filtering effect. To clean the filter cartridge 20, the pre-filter has a backwashing function and a scraping function, and the filter cartridge 20 is cleaned by cooperation of backwashing and scraping.

[0046] Specifically, the pre-filter is provided with a backwashing port, and the end of the filter bottle 10 away from the valve head 200 is provided with a blowdown port. The backwashing port can communicate the water inlet channel 210 and the inside of the filter cartridge 20. When the backwashing port is opened, the water outlet channel 220 of the pre-filter is closed, and water directly enters the inside of the filter cartridge 20 through the water inlet channel 210 and the backwashing port, backwashing the filter cartridge 20 to flush away the impurities on the outer circumferential surface of the filter cartridge 20. The sewage flows to the blowdown port through the annular gap, achieving flushing of the filter cartridge 20.

[0047] To improve the flushing effect on the filter cartridge 20, as shown in Figure 2 , an inner rotating part 40 is arranged to rotate in the filter cartridge 20. The inner rotating part 40 can rotate around the axis of the filter cartridge 20 under the driving action of the backwashing water flow, playing a role of flow disturbance and guiding the backwashing water to flow spirally and uniformly to the filter cartridge 20, improving flushing uniformity and making the flushing effect better.

[0048] To improve the cleaning effect on the filter screen, as shown in Figure 2 and Figure 3 , the filter main body 100 further includes a scraping assembly 50, which includes an outer skeleton 51 and a scraping part 52 arranged on the outer skeleton 51. The outer skeleton 51 is rotatably sleeved on the outside of the filter cartridge 20, and the scraping part 52 is used to scrape the filter cartridge 20. One end of the outer skeleton 51 facing the blowdown port is connected with an impeller 53, which can drive the outer skeleton 51 to rotate around the axis of the filter cartridge 20 under the driving of the backwashing water flow. By arranging the impeller 53 and using the backwashing water flow as a driving source, the outer skeleton 51 is rotated in the backwashing process to drive the scraping part 52 on the outer skeleton 51 to scrape the filter cartridge 20, further improving the cleaning effect on the filter cartridge 20, without the need for manual operation by the user or the need for additional introduction of a driving source, simplifying user operation and reducing cost.

[0049] To improve the flushing effect of the backwashing water flow on the filter cartridge 20, in some embodiments, as shown in Figure 4As shown, the inner rotating part 40 comprises a turbine 42, which can guide the backwashing water flow to spiral flow after rotation, so as to sufficiently diffuse and increase the water pressure of the backwashing water flow, thereby improving the washing effect on the filter cartridge 20.

[0050] In some embodiments, the turbine 42 is arranged at one end of the filter cartridge 20 close to the valve head 200, so that the turbine 42 is closer to the backwashing port and can sufficiently diffuse and increase the water pressure of the backwashing water flow entering the filter cartridge 20, thereby improving the washing effect on the filter cartridge 20.

[0051] In order to improve the stability of the inner rotating part 40 in the filter cartridge 20, in some embodiments, as shown in Figure 4 and Figure 5 As shown, the filter body 100 further comprises a central framework 30 arranged in the filter cartridge 20, and the inner rotating part 40 is sleeved outside the central framework 30 to be supported by the central framework 30, thereby improving the stability of the inner rotating part 40.

[0052] In order to ensure normal filtering function, the central framework 30 is hollow to form a communication channel, and a plurality of first through holes are arranged on the outer circumferential surface of the central framework 30 and communicate with the communication channel; the end of the communication channel close to the valve head 200 communicates with the water outlet channel. When the pre-filter is filtering, the water in the water inlet channel 210 enters the annular gap and is filtered along the radial direction of the filter cartridge 20, and the filtered water enters the communication channel in the central framework 30 through the first through holes to enter the water outlet channel 220 through the communication channel.

[0053] In order to ensure the stability of the position of the central framework 30, in some embodiments, the filter body 100 further comprises a base 60 arranged in the filter bottle 10 in a sealed manner, the base 60 is located between the filter cartridge 20 and the blowdown port, and the central framework 30 or the base 60 penetrates through the filter cartridge 20 to realize the connection and fixation of the central framework 30 and the filter cartridge 20. The base 60 is provided with a water passage to enable the sewage during backwashing to enter the blowdown port through the water passage.

[0054] In order to realize the positioning of the axial position of the inner rotating part 40 along the filter cartridge 20, in some embodiments, the end of the central framework 30 close to the backwashing port is provided with a first limiting part, the inner rotating part 40 is located between the first limiting part and the filter cartridge 20, one end of the inner rotating part 40 can abut against the first limiting part, and the other end can abut against the filter cartridge 20, and the axial positioning of the inner rotating part 40 is realized through the cooperation of the first limiting part and the filter cartridge 20.

[0055] Optionally, as shown in Figure 5As shown, the center skeleton 30 includes a communication section 31, a transition section 32 and a matching section 33, the outer diameter of the communication section 31 is greater than that of the matching section 33, the transition section 32 connects the communication section 31 and the matching section 33, and the outer diameter of the transition section 32 gradually decreases from the communication section 31 to the matching section 33. The inner rotating part 40 is sleeved on the outside of the matching section 33, and the filter section forms a first limiting part to limit the axial position of the inner rotating part 40 in cooperation with the bottom surface of the filter cartridge 20.

[0056] In order to make the turbine 42 close to the backwashing port, in some embodiments, the inner rotating part 40 further includes a sleeve 41, the turbine 42 is arranged at one end of the sleeve 41 close to the backwashing port, and the sleeve 41 is sleeved on the outside of the center skeleton 30. Specifically, the sleeve 41 cooperates with the matching section 33. With this arrangement, the axial dimension of the turbine 42 is reduced on the basis of achieving axial positioning by arranging the sleeve 41, and the turbine 42 is ensured to be close to the backwashing port.

[0057] In order to enable the filtered water to enter the communication channel, a plurality of second through holes are arranged on the sleeve 41, and the second through holes enable the filtered water in the filter cartridge 20 to enter the communication channel through the second through holes and the first through holes in sequence.

[0058] In order to realize the backwashing function, the valve head 200 includes an inner ring flange 240 and an outer ring flange 230 arranged in a nested manner, the inner part of the inner ring flange 240 is in communication with the inlet end of the water outlet channel 220, and the inner part of the outer ring flange 230 is in communication with the outlet end of the water inlet channel 210. The open end of the filter bottle 10 is connected with the outer ring flange 230, so that the outlet end of the water inlet channel 210 can be in communication with the inside of the filter bottle 10; the communication section 31 of the center skeleton 30 is connected with a backwashing part 90, the backwashing part 90 is a tubular structure, and the backwashing part 90 can be nested with the inner ring flange 240 to enable the communication channel to be in communication with the water outlet channel 220.

[0059] In order to realize the switching of the backwashing function and the filtering function, the backwashing port is arranged on the backwashing part 90, and the center skeleton 30 is movably arranged in the filter cartridge 20 to drive the backwashing part 90 to move relative to the inner ring flange 240, so that the backwashing port can be switched between the open and closed states.

[0060] Optionally, the center skeleton 30 is arranged in the filter cartridge 20 in a sliding manner along the axial direction of the filter cartridge 20. When the center skeleton 30 moves away from the valve head 200 along the axial direction of the filter cartridge 20, the backwashing member 90 is driven by the center skeleton 30 to move relative to the inner ring flange 240, the backwashing port is exposed and opened, and the water in the water inlet channel 210 flows into the communication passage in the center skeleton 30 to flow from the inside to the outside of the filter cartridge 20, so as to achieve the purpose of flushing the filter cartridge 20. When the center skeleton 30 moves towards the valve head 200 along the axial direction of the filter cartridge 20, the nesting depth of the backwashing member 90 and the inner ring flange 240 increases, the backwashing port is blocked by the inner ring flange 240, the water inlet channel 210 is not communicated with the backwashing port, and the pre-filter can realize the filtering function.

[0061] Optionally, the backwashing member 90 can be integrally formed with the center skeleton 30 to reduce the number of parts; the backwashing member 90 can also be fixed to the center skeleton 30 by assembly.

[0062] In other embodiments, the backwashing member 90 can be fixed on the valve head 200, for example, the backwashing member 90 is fixedly connected with the inner ring flange 240, and the center skeleton 30 is nested with the backwashing member 90, and the backwashing port is blocked or opened by the axial movement of the center skeleton 30.

[0063] In order to make the backwashing water flow into the center skeleton 30, some embodiments are provided with a water outlet 321 on the center skeleton 30 on the side close to the backwashing port of the inner rotating member 40, and the water outlet 321 is communicated with the communication passage. This kind of arrangement makes the backwashing water in the communication passage flow out through the water outlet 321 to cooperate with the inner rotating member 40, so as to drive the inner rotating member 40 to rotate.

[0064] In some embodiments, the water outlet 321 is arranged on the transition section 32 of the center skeleton 30, and the outer peripheral surface of the transition section 32 is a tapered surface, which can make the backwashing water flow in the center skeleton 30 more easily flow out through the water outlet 321 and act on the inner rotating member 40, so as to improve the pushing effect on the inner rotating member 40.

[0065] To realize the automatic switching of the backwashing function and the filtering function, the pre-filter further comprises a reset member 70, which can reset the central framework 30. After the central framework 30 is reset, the backwashing member 90 is driven to be close to the valve head 200 to close the backwashing port, so that the pre-filter is in the filtering function state. When backwashing is needed, the water outlet channel 220 is closed, and the sewage port is opened. Under the action of the water flow pressure, the water flow will drive the central framework 30 to move along the axial direction of the filter cartridge 20 away from the valve head 200, so as to drive the backwashing member 90 to move away from the inner ring flange 240 to open the backwashing port, so as to switch to the backwashing state. After the backwashing is completed, the sewage port is closed, the water outlet channel 220 is opened, and the central framework 30 will be reset under the action of the reset member 70.

[0066] Optionally, the reset member 70 can be a spring, which is simple in structure and low in cost.

[0067] Optionally, the reset member 70 is connected to the base 60 and the filter bottle 10, so that the reset member 70 does not occupy the filtering space in the filtering function state.

[0068] In order to provide the movement space of the central framework 30 and the limiting, the inner ring flange 240 and the axial end surface of the filter cartridge 20 are arranged in the axial direction of the filter cartridge 20, and the outer wall of the central framework 30 is further provided with a second limiting part, which is located between the inner ring flange 240 and the axial end surface of the filter cartridge 20. When the central framework 30 drives the backwashing member 90 to move to block the backwashing port, the second limiting part abuts against the inner ring flange 240 to limit the central framework 30 from continuously moving towards the valve head 200; when switching to the backwashing function, the second limiting part can abut against the axial end surface of the filter cartridge 20 to limit the central framework 30 from continuously moving away from the valve head 200.

[0069] In some embodiments, the second limiting part comprises a limiting flange 34 extending in the radial direction of the central framework 30. Optionally, the limiting flange 34 can be connected to one end of the communication section 31 close to the valve head 200, and the backwashing member 90 is arranged on the limiting flange 34.

[0070] In some embodiments, the backwashing member 90 is nested on the inner side of the inner ring flange 240, and the central framework 30 is provided with a first sealing member 81, which can cooperate with the inner ring flange 240 after the central framework 30 is moved to the position towards the valve head 200 to realize the sealing of the second limiting part and the inner ring flange 240.

[0071] Optionally, the second limiting part further comprises a sealing flange, which is located on the limiting flange 34 and outside the backwashing member 90. The first sealing member 81 is sleeved outside the sealing flange, covers the outer circumferential surface of the sealing flange, and covers the axial end surface of the sealing flange on the side facing the valve head 200. When the backwashing member 90 cooperates with the inner ring flange 240 to block the backwashing port, the first sealing member 81 is clamped between the inner ring flange 240 and the sealing flange to seal the gap between the inner ring flange 240 and the sealing flange, so as to avoid the water flowing through the gap between the sealing flange and the inner ring flange 240 into the backwashing port.

[0072] In other embodiments, the first sealing member 81 can only cover the axial end surface of the sealing flange on the side facing the valve head 200.

[0073] In some embodiments, the central framework 30 is provided with a second sealing member 82, which is clamped between the filter cartridge 20 and the central framework 30 to achieve sliding sealing between the central framework 30 and the filter cartridge 20, so as to ensure that the water flows along the set trajectory in different states of the pre-filter.

[0074] Optionally, the first sealing member 81 and the second sealing member 82 can both be sealing rings.

[0075] In some embodiments, the central framework 30 and the base 60 can be connected through threaded cooperation. For example, the central framework 30 is provided with external threads, and the base 60 is provided with a threaded hole. Through the cooperation of the external threads and the threaded hole, the central framework 30 and the base 60 are fixed.

[0076] In some embodiments, the base 60 comprises a seat body 61 and a third sealing member 62 sleeved outside the seat body 61. The seat body 61 is connected with the central framework 30, and the third sealing member 62 abuts against the inner wall of the filter bottle 10 to achieve sealing cooperation between the base 60 and the filter bottle 10, so as to ensure that the backwashing water flows through the water outlet to the drain outlet, and avoid that the dirt accumulates in the gap between the base 60 and the filter bottle 10 to affect the movement of the base 60 with the central framework 30.

[0077] In other embodiments, the turbine 42 in the inner rotating member 40 can be replaced by helically extending protrusions or grooves, as long as it can drive the inner rotating member 40 to rotate under the action of water flow.

[0078] In some embodiments, the rotation direction of the inner rotating member 40 under the driving of the backwashing water flow is the same as the rotation direction of the impeller 53 under the driving of the backwashing water flow, so that the rotation direction of the water flow entering the annular gap after being guided by the inner rotating member 40 is adapted to the rotation direction of the impeller 53, so as to improve the driving effect on the impeller 53.

[0079] In some embodiments, the impeller 53 is integrally formed with the outer frame 51. Such arrangement can reduce the number of parts, simplify assembly and reduce cost.

[0080] Specifically, the outer frame 51 comprises a circumferential side frame, the impeller 53 comprises a central shaft and a plurality of blades arranged along the circumference of the central shaft. The impeller 53 is arranged in an axial end of the circumferential side frame, the outer edges of the blades are connected with the circumferential side frame, the central shaft is provided with a central hole, and the central hole is rotationally matched with the base 60 to realize positioning of the outer frame 51.

[0081] Optionally, the base 60 comprises a central column extending into the central hole to realize positioning of the outer frame 51.

[0082] It can be understood that the gap between adjacent blades in the impeller 53 can allow the backwashing water flow to pass through to realize sewage discharge.

[0083] In other embodiments, the outer frame 51 and the impeller 53 can be a split structure, and the outer frame 51 and the impeller 53 are drivingly matched to drive the outer frame 51 to rotate by the impeller 53.

[0084] In some embodiments, the impeller 53 is rotationally arranged on the side of the base 60 away from the outer frame 51, so that the impeller 53 is closer to the sewage discharge port, the backwashing water flow after passing through the water port is more concentrated on the impeller 53, the driving effect on the impeller 53 is better, the rotating speed of the outer frame 51 is improved, and the scraping and washing effect on the filter cartridge 20 is improved.

[0085] In some embodiments, the side of the base 60 away from the outer frame 51 is provided with a containing groove, and the impeller 53 is located in the containing groove, so that the backwashing water flow passing through the water port acts on the impeller 53, and the driving effect on the impeller 53 is improved.

[0086] To realize the driving cooperation between the impeller 53 and the outer frame 51, the outer frame 51 is provided with an insertion slot, and the impeller 53 is provided with an insertion part which can be inserted into the insertion slot to realize the circumferential positioning of the impeller 53 and the outer frame 51, so that the outer frame 51 is driven to rotate by the impeller 53.

[0087] Optionally, the insertion part can be provided with a plurality of insertion parts arranged along the circumference of the impeller 53, and can be arranged on the axial end surface of the central shaft. Correspondingly, the insertion slot is provided with a plurality of insertion slots, and each insertion part can be matched with a corresponding insertion slot.

[0088] Exemplarily, the insertion slot is a through slot penetrating along the axis of the outer frame 51, and the dimension of the insertion part along the axis of the outer frame 51 is greater than that of the insertion slot, so that when the central frame 30 drives the base 60 to move, the insertion part can always be matched with the insertion slot, so as to ensure the stability of the driving of the outer frame 51 and the impeller 53.

[0089] In some other embodiments, the insertion groove can be arranged on the impeller 53, and correspondingly, the insertion part is arranged on the exoskeleton 51, and the transmission cooperation can also be achieved.

[0090] In some other embodiments, the impeller 53 and the exoskeleton 51 can be fixed by clamping, key connection or screw connection, so as to realize transmission.

[0091] In some embodiments, the number of the scraping and washing pieces 52 is at least two, and the at least two scraping and washing pieces 52 are arranged in a circumferential direction of the exoskeleton 51, so as to improve the scraping and washing effect on the filter cartridge 20.

[0092] In some embodiments, the two adjacent scraping and washing pieces 52 are arranged in an axial direction of the exoskeleton 51. By arranging in the axial direction, the overall scraping and washing area of the scraping and washing assembly 50 can be increased, the dead angle of scraping and washing can be avoided, and the cleaning effect on the filter cartridge 20 can be improved.

[0093] In some embodiments, the scraping and washing piece 52 is made of elastic material, and the scraping and washing piece 52 can have a certain pre-pressing amount with the filter cartridge 20, so as to ensure the contact effect and not easily damage the filter cartridge 20.

[0094] For example, the scraping and washing piece 52 can be made of silica gel, rubber or sponge.

[0095] In order to improve the self-cleaning effect on the pre-filter, in some embodiments, the scraping and washing piece 52 is arranged on the exoskeleton 51. Figure 3 and Figure 6 As shown, the scraping and washing piece 52 is arranged on the exoskeleton 51, so that the scraping and washing piece 52 can abut against the inner wall of the filter bottle 10 and the outer wall of the filter cartridge 20, respectively. This arrangement not only realizes the cleaning of the filter cartridge 20, but also realizes the cleaning of the inner wall of the filter bottle 10.

[0096] In some embodiments, the scraping and washing piece 52 extends in a radial direction of the exoskeleton 51, so that the scraping and washing piece 52 is perpendicular to the outer circumferential surface of the filter cartridge 20, and the scraping and washing effect on the filter cartridge 20 is more thorough.

[0097] In some embodiments, the scraping and washing piece 52 includes an outer scraping and washing part 521, a clamping part 523 and an inner scraping and washing part 522 arranged in sequence in the direction of being arranged on the exoskeleton 51, the exoskeleton 51 is provided with a clamping hole, the clamping part 523 is arranged in the clamping hole, and the sizes of the outer scraping and washing part 521 and the inner scraping and washing part 522 are greater than that of the clamping hole, so as to realize limiting and fixing and avoid the scraping and washing piece 52 from being separated from the exoskeleton 51. The outer scraping and washing part 521 contacts the inner wall of the filter bottle 10, and the inner scraping and washing part 522 contacts the outer circumferential surface of the filter cartridge 20.

[0098] In some embodiments, the pre-filter further includes a blowdown valve 300, which is in communication with the blowdown port and is used for controlling the opening and closing of the blowdown port.

[0099] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claims.

Claims

1. A prefilter, characterized by, The pre-filter is provided with a backwashing port, and the pre-filter comprises a valve head (200) and a filter main body (100), the filter main body (100) comprises: A filter bottle (10) is connected to one end of the valve head (200), and the other end of the filter bottle (10) is provided with a blowdown port; A filter cartridge (20) is arranged in the filter bottle (10), and the backwashing port can communicate with the inside of the filter cartridge (20); An inner rotating part (40) is rotationally arranged in the filter cartridge (20), and the inner rotating part (40) can rotate under the driving of a backwashing water flow; A scraping assembly (50) comprises an outer skeleton (51) and a scraping part (52) arranged on the outer skeleton (51), the outer skeleton (51) is rotationally sleeved on the outside of the filter cartridge (20), the scraping part (52) is used for scraping the filter cartridge (20), one end of the outer skeleton (51) towards the blowdown port is connected with an impeller (53), and the impeller (53) can drive the outer skeleton (51) to rotate under the driving of the backwashing water flow.

2. The prefilter of claim 1, wherein, The inner rotating part (40) comprises a turbine (42), and the turbine (42) is rotationally arranged in the filter cartridge (20).

3. The prefilter of claim 2, wherein, The turbine (42) is arranged at one end of the filter cartridge (20) close to the valve head (200).

4. The prefilter of claim 1, wherein, The filter main body (100) further comprises a central skeleton (30) which is movably arranged in the filter cartridge (20) to open or close the backwashing port, and the inner rotating part (40) is sleeved on the outside of the central skeleton (30).

5. The prefilter of claim 4, wherein, The central skeleton (30) comprises a first limiting part, one end of the inner rotating part (40) can abut against the first limiting part, and the other end can abut against the filter cartridge (20).

6. The prefilter of any one of claims 1-5, wherein, The impeller (53) is integrally formed with the outer skeleton (51); Or, the impeller (53) is in transmission cooperation with the outer skeleton (51).

7. The prefilter of claim 6, wherein, The filter main body (100) further comprises a base (60) located in the filter bottle (10), the base (60) is sealingly connected with the filter bottle (10), and a water passage is arranged on the base (60); The impeller (53) is rotationally arranged on one side of the base (60) towards the blowdown port.

8. The prefilter of claim 7, wherein, One of the outer skeleton (51) and the impeller (53) is provided with a plug-in part, and the other is provided with a plug-in slot, and the plug-in part is inserted into the plug-in slot; And / or, the base (60) is provided with a containing groove, and the impeller (53) is located in the containing groove.

9. The prefilter of any one of claims 1-5, wherein, The number of the scraping parts (52) is at least two, at least two scraping parts (52) are arranged in a circumferential direction of the outer skeleton (51), and adjacent two scraping parts (52) are arranged in an axial direction of the outer skeleton (51).

10. The prefilter of any one of claims 1-5, wherein, The scraping part (52) is made of elastic material; And / or, the scraping part (52) is arranged in the outer skeleton (51), so that the scraping part (52) can abut against the inner wall of the filter bottle (10) and the outer wall of the filter cartridge (20) respectively; And / or, the scrubbing member (52) extends in a radial direction of the exoskeleton (51).

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