Pre-filter and filtering device

Abstract

The present invention relates to the field of filters, and more specifically to a pre-filter and a filtering device. The present invention provides a pre-filter, comprising: a filter element and a guide portion installed on the filter element; the guide portion rotates axially under the impact of water inflow to drive the filter element to rotate. By adding a guide portion to the filter element, the guide portion drives the filter element to rotate due to the impact of water inflow, and the water power and dynamic friction on the filter surface are used to reduce the retention of surface scale, so as to ensure the long-term use of the filter element, solve the problem that the filter element is easy to scale and inconvenient to clean, and improve the reliability of the product.

Description

Technical Field

[0001] The invention relates to the field of filters, and in particular to a pre-filter and a filtering device. Background Art

[0002] As people's living standards are improving, they are beginning to pay more and more attention to the quality of drinking water in their daily lives. In daily life, tap water passes through many pipes when it reaches the homes of each water user through the pipeline network. There are many impurities such as silt, rust, and plankton inside the pipes, which seriously affect the quality of drinking water. Therefore, using a pre-filter to filter the water source entering the home can not only effectively remove solid impurities and other pollutants in the water source to ensure the quality of drinking water for users, but also effectively protect household pipes, valves, water-related equipment, and water-related home appliances and other components to prevent impurities in the water source from causing component failures.

[0003] After the pre-filter has been used for a period of time, the filter cartridge in the pre-filter will be blocked by some fine sand or other impurities. At this time, the filter cartridge needs to be cleaned. The pre-filters currently on the market include forward flushing type, back flushing type and siphon flushing type. However, different types of pre-filters have different problems:

[0004] The flushing intensity of the forward flushing pre-filter is very weak, and the filter element is easily blocked. Not only can the smaller impurities not be flushed out, but they are embedded deeper and tighter in the filter element, which is easy to cause secondary pollution; when the backwash type pre-filter encounters intercepted objects blocked in the filter mesh hole, it is necessary to open the filter bottle to take out the filter mesh and clean it with auxiliary tools, which also brings trouble to the user; the siphon type pre-filter product structure is complex and the flushing is not thorough. If the water quality is relatively poor, the impurities are embedded deeper and tighter in the filter element, and finally the filter element is blocked. Once the filter element is blocked, it is very difficult to clean. It can be seen that the pre-filters in the prior art all have the problem that the filter element is easily blocked, which in turn affects the normal operation of the filter.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The first purpose of the present invention is to provide a pre-filter. The present invention installs a guide part on the filter element, and the guide part drives the filter element to rotate through the impact of water inflow, and uses the water power and the dynamic friction of the filter surface to reduce the retention of surface scale, thereby ensuring the long-term use of the filter element, solving the problem that the filter element is easy to scale and inconvenient to clean, and improving the reliability of the product.

[0007] The second object of the present invention is to provide a filtering device including the above-mentioned pre-filter, which is more convenient to use, has high reliability, long service life, is easy to clean, and has high working efficiency.

[0008] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0009] The present invention provides a pre-filter, comprising: a filter element and a flow guide portion installed on the filter element; the flow guide portion rotates axially under the impact of incoming water to drive the filter element to rotate.

[0010] The pre-filter of the present invention achieves the self-cleaning ability of the filter element by installing a guide part above the filter element and utilizing natural water power, abandoning the previous cleaning method in which the filter element is easily blocked, effectively improving the reliability of the product, improving the cleaning efficiency, and extending the service life of the filter.

[0011] In the prior art, the cleaning of the pre-filter mainly adopts the maintenance methods of manual scraping and automatic flushing. Among them, the manual scraping method requires opening the filter bottle, taking out the filter screen, and cleaning it with auxiliary tools. The operation is cumbersome and it is easy to cause impurities to be embedded deeper and tighter in the filter element, and finally cause the filter element to be blocked. Once the filter element is blocked, it is very difficult to clean; the automatic flushing method not only cannot flush out smaller impurities, but embeds them deeper and tighter in the filter element, which is easy to cause secondary pollution. It can be seen that how to avoid the accumulation of impurities on the filter screen has become a problem that needs to be solved urgently.

[0012] In order to solve the technical problems in the prior art, the present invention utilizes natural water power to drive the filter element to rotate, and uses the dynamic friction on the filter surface to reduce the retention of scale, thereby solving the problem that the filter element is easily scaled and inconvenient to clean. This rotatable cleaning method of the filter element greatly increases the life of the filter element and can even be used for an extended period of time, and is worthy of wide promotion and application.

[0013] Preferably, the guide part includes a guide impeller mounted on the top of the filter element, the guide impeller is concentric with the filter element, and the guide impeller is fixed to the filter element through a keyway. When working, the water flow impacts the blades of the guide impeller, causing the guide impeller to rotate, thereby driving the filter element to rotate, thereby achieving self-cleaning of the filter element.

[0014] Preferably, the guide part further comprises a guide frame arranged on the upper part of the guide impeller, and the guide frame is used to guide the incoming water to the guide impeller. Through the guide function of the guide frame, it is ensured that the water flow can accurately impact the blades of the guide impeller, and the water flow is more concentrated and efficient in flushing, thereby improving work efficiency.

[0015] Preferably, the guide frame is provided with a spiral water inlet channel. The provision of the spiral water inlet channel can enhance the impact force of the water flow. The water enters the spiral water inlet channel and rotates centrifugally and rapidly, and the narrowing design of the channel makes the water flow extremely impactful, thereby increasing the rotation speed of the guide impeller.

[0016] Preferably, the pre-filter further comprises a fixed shaft and a rotating shaft, wherein the fixed shaft is mounted on the inner side of the guide frame; the rotating shaft is mounted on the top of the filter element, and the fixed shaft is stacked on the upper part of the rotating shaft. The stacking arrangement of the fixed shaft and the rotating shaft is beneficial to both the sealing effect and the normal rotation of the filter element, thus ensuring the smooth progress of the cleaning work.

[0017] Preferably, the contact surface between the fixed shaft and the rotating shaft is a plane or a conical surface. Further, the contact surface between the fixed shaft and the rotating shaft is a conical surface. Compared with a plane, a conical contact surface is easier to process, and the use of a conical surface can achieve both a sealing effect and a positioning effect.

[0018] Preferably, the fixed shaft and the rotating shaft are made of ceramic material. Ceramics have excellent wear resistance and self-lubricating properties, and have good sealing effect. The use of ceramic material can reduce the resistance between the fixed shaft and the rotating shaft, and the material is non-toxic, which can increase the service life of the equipment.

[0019] Preferably, a first sealing ring is provided between the fixed shaft and the guide frame. The first sealing ring can fill the gap between the fixed shaft and the guide frame to prevent leakage and enhance the sealing effect.

[0020] Preferably, a second sealing ring is provided between the rotating shaft and the filter element, which is conducive to filling the gap between the rotating shaft and the filter element, and can also improve the sealing effect and prevent fluid leakage.

[0021] Preferably, a positioning spring for buffering hard pressure impact is arranged above the fixed shaft. The use of the positioning spring can prevent excessive pressure caused by hard fixation from affecting the rotation of the filter element.

[0022] Preferably, the filter element comprises a frame and a filter screen coated on the frame, and a plurality of water inlet holes are evenly distributed on the side wall of the frame. Such an arrangement can improve the physical properties of the filter element, enhance the mechanical properties of the filter element, and thus increase the service life of the equipment.

[0023] Preferably, each water inlet hole is spaced apart from each other and is not easily arranged too densely. If the holes are arranged too densely, impurities can be easily brought into the interior of the filter element through the water inlet holes.

[0024] Preferably, the aperture of the water inlet on the outer wall of the frame is larger than the aperture of the inner wall of the frame. Since the frame itself has a certain thickness, the outer aperture of the water inlet is large, and the inner aperture gradually decreases. This design mainly considers that the filtered clean water can be quickly sucked into the filter element, and the speed is slowed down when it is closer to the center of the filter element, reducing the impact to improve safety, so that impurities are successfully trapped on the outside of the filter by the filter.

[0025] Preferably, the filter screen is composed of a 316 stainless steel filter screen with a filtration accuracy of 40 microns. The use of stainless steel material can improve the corrosion resistance of the filter screen, thereby increasing the service life of the equipment. Using a 40-micron filtration accuracy can ensure a good filtration effect and basically meet the filtration requirements.

[0026] Preferably, a base is provided at the bottom of the frame, and the base is used to support the frame. The base support improves the rotation stability of the filter element, enhances the strength of the overall structure, and is conducive to prolonging the life of the product.

[0027] Preferably, a positioning pin is provided between the filter element and the base. The positioning pin is fixedly connected to the filter element; the positioning pin is rotatably connected to the base. The use of the positioning pin can improve the rotation effect of the filter element and facilitate the fixation of the filter element to the base. The positioning pin fits tightly with the base, which can prevent scale from entering therein and hindering the rotation of the filter element.

[0028] Preferably, the base is made of plastic; further, the base is made of POM. POM is selected because it has good self-lubricating properties and will not hinder the rotation of the filter element; on the other hand, it has excellent physical properties, and its strength and rigidity can meet the use requirements, and it has good wear resistance, which is conducive to improving the working efficiency and service life of the equipment.

[0029] Preferably, the pre-filter further comprises a bottle-shaped shell, and the bottle-shaped shell is coated on the outside of the frame. Such an arrangement can improve the working efficiency and service life of the product.

[0030] Preferably, the pre-filter further comprises a head with a water inlet and outlet and a drainage assembly connected to the lower end of the bottle-shaped shell. The head is fixed to the bottle-shaped shell by a threaded connection. Such an arrangement can improve the quality of the equipment and thus increase its service life.

[0031] The present invention also provides a filtering device including the above-mentioned pre-filter. The device utilizes natural water power to drive the central filter screen of the pre-filter to rotate, and utilizes water power and dynamic friction on the filter screen surface to reduce the retention of surface scale, thereby increasing the service life of the device and having high working efficiency. The filtering device has a very wide range of applications, especially in tap water pipe networks, ensuring the pre-filtration of tap water for each water user. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0033] Figure 1 A schematic diagram of the structure of a pre-filter provided in Example 1 of the present invention;

[0034] Figure 2 for Figure 1 A partial enlarged view of part A;

[0035] Figure 3 A schematic structural diagram of a guide impeller provided in Example 1 of the present invention;

[0036] Figure 4 A schematic diagram of the water flow direction when the pre-filter provided in Example 1 of the present invention is in operation;

[0037] Figure 5 A schematic diagram of the structure of the pre-filter provided in Example 2 of the present invention. Description of the drawings:

[0039] 10-machine head; 20-positioning spring;

[0040] 30-guide frame; 40-guide impeller;

[0041] 50-filter element; 501-frame;

[0042] 5011-water inlet; 502-filter;

[0043] 60-bottle-shaped housing; 70-base;

[0044] 80-drain assembly; 90-positioning needle;

[0045] 100-second sealing ring; 110-rotating shaft;

[0046] 120 - fixed shaft; 130 - first sealing ring. DETAILED DESCRIPTION

[0047] The technical scheme of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but it will be understood by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. If specific conditions are not specified in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0048] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In order to more clearly explain the technical solution of the present invention, it is described in the form of specific embodiments below.

[0051] Example 1

[0052] See also Figure 1-Figure 2 As shown, the pre-filter provided in the embodiment of the present invention comprises: a filter element 50, which is composed of a frame 501 and a filter screen 502 covered on the frame 501. A guide impeller 40 is fixedly mounted on the top of the filter element 50, and the guide impeller 40 is concentrically arranged with the filter element 50, so that the filter element 50 can be rotated along the axis without deviation, so as not to affect the filtering effect.

[0053] The specific structure of the guide vane 40 is as follows: Figure 3 As shown, the guide impeller 40 includes a plurality of blades with the same inclination angle, and the blades are arranged circumferentially, and the rotation of the blades drives the filter element at the bottom to rotate. A guide frame 30 for diversion is also installed on the upper part of the guide impeller 40, and the guide impeller 40 and the guide frame 30 together constitute a guide part. A spiral water inlet channel is provided on the guide frame 30, and the incoming water passes through the spiral water inlet channel, which can increase the impact force of the incoming water, thereby increasing the rotation speed of the guide impeller 40. The outlet of the spiral water inlet channel of the guide frame 30 is directly opposite to the blades of the guide impeller 40, thereby ensuring that the water flow can accurately impact the blades of the guide impeller 40.

[0054] The pre-filter of the embodiment of the present invention further comprises a fixed shaft 120 installed on the inner side of the guide frame 30 and a rotating shaft 110 installed on the top of the filter element 50, wherein the fixed shaft 120 is overlapped on the upper part of the rotating shaft 110 and the two are arranged concentrically, and the contact surface between the fixed shaft 120 and the rotating shaft 110 is a plane. When the pre-filter is operating normally, the fixed shaft 120 and the guide frame 30 are fixed together, and the rotating shaft 110 rotates together with the guide impeller 40 under the action of the guide impeller 40.

[0055] A second sealing ring 100 is disposed between the filter element 50 and the rotating shaft 110, and a first sealing ring 130 is disposed between the fixed shaft 120 and the guide frame 30. Such an arrangement can enhance the sealing effect and prevent fluid leakage.

[0056] A positioning spring 20 for buffering hard pressure impact is arranged above the fixing shaft 120. The use of the positioning spring 20 can prevent the fixing pressure from being too large due to hard fixing, thereby affecting the rotation of the filter element 50.

[0057] A base 70 for supporting the fixed frame is provided at the bottom of the frame 501, and the base 70 is rotatably connected to the frame 501 of the filter element 50 through a positioning pin 90. The positioning pin 90 is rotatably connected to the base 70 and fixedly connected to the frame 501. This arrangement enhances the strength of the overall structure and is conducive to improving the service life of the device. The positioning pin 90 fits tightly with the base 70 to prevent scale from entering therein and hindering the rotation of the filter element.

[0058] A bottle-shaped housing 60 is also provided outside the frame 501 of the filter element 50. The upper part of the bottle-shaped housing 60 is connected to the head 10 with a water inlet and outlet through a thread, and the lower part of the bottle-shaped housing 60 is fixedly connected to a drainage assembly 80 for sewage discharge. The head 10 is provided with a water inlet and a water outlet of the filter, and the drainage assembly 80 is arranged at the bottom of the filter, mainly used for the discharge of impurities such as scale.

[0059] like Figure 4The figure shows the schematic diagram of the water flow direction when the pre-filter provided in this embodiment is working. When working, water flows into the guide frame 30 through the water inlet of the machine head 10, and enters the bottled shell 60 after rotating and accelerating through the spiral water inlet channel of the guide frame 30, and impacts the guide impeller 40 to make it rotate along the axial direction of the filter. After the water flows through the guide impeller 40, it is filtered by the filter screen 502 of the filter element 50, and impurities are trapped on the outside of the filter screen. The clean water enters the inside of the filter element from the water inlet hole 5011, and then flows upward from the filter element, through the filter element 50, and flows out from the water outlet of the machine head 10. The water flow with impact force impacts the blades of the guide impeller 40, causing the guide impeller 40 to rotate, and then drives the filter element 50, the rotating shaft 110 and the positioning needle 90 to rotate through the guide impeller 40, so as to realize the self-cleaning of the filter element 50. Impurities in the water filtered by the filter 502 are quickly deposited to the bottom along the inner wall of the bottle-shaped shell. When cleaning, the scale can be easily discharged by opening the drainage assembly 80.

[0060] The fixed shaft 120 and the rotating shaft 110 are both made of ceramic. Ceramics have excellent wear resistance and self-lubricating properties, and have good sealing effects. The use of ceramic materials can reduce the resistance between the fixed shaft 120 and the rotating shaft 110, and the material is non-toxic, safe and environmentally friendly, and can increase the service life of the equipment.

[0061] The side wall of the frame 501 of the filter element 50 is evenly distributed with a plurality of water inlet holes 5011. The diameter of the water inlet holes 5011 on the outer side wall of the frame is larger than the diameter of the inner side wall of the frame, so as to improve the filtering efficiency without affecting the strength and rigidity of the frame 501 itself.

[0062] The filter 502 is composed of a 316 stainless steel filter with a filtration accuracy of 40 microns. Stainless steel has excellent corrosion resistance and is beneficial to improving the service life of the equipment; using a 40 micron filtration accuracy can ensure a good filtration effect.

[0063] The base 70 is made of POM plastic material. The POM base has good self-lubricating properties and will not hinder the rotation of the filter element 50. On the other hand, it has excellent physical properties, and its strength and rigidity can meet the use requirements, and it has good wear resistance, which is conducive to improving the working efficiency and service life of the equipment.

[0064] Example 2

[0065] The structure and working mode of the pre-filter provided in this embodiment are the same as those in Embodiment 1, except that the contact surface between the rotating shaft 110 and the fixed shaft 120 is different. Figure 5 As shown, the contact surface between the rotating shaft 110 and the fixed shaft 120 is a conical surface.

[0066] Compared with a flat contact surface, a conical surface is easier to process and can achieve better sealing and positioning functions.

[0067] The pre-filters provided in the two embodiments of the present invention achieve self-cleaning capability by adding a guide frame and a guide impeller to the filter element, so that the filter element can rotate using the impact force of the water flow. The water flow drives the filter assembly to rotate rapidly, effectively reducing the blockage and agglomeration of the filter screen by impurities and other suspended matter in the water. Dynamic filtration enables the filter screen to play a self-cleaning role, prolongs the life of the filter screen, reduces the number of flushing times, and can save water resources; the rapid rotation of the filter assembly simultaneously drives the water in the pre-filter bottle to rotate centrifugally, so that the impurities in the water quickly precipitate along the bottle wall, while reducing the contact between the impurities and the filter screen, reducing pressure loss, fast filtration, large water flow, and no blockage of the filter screen.

[0068] The pre-filter of the present invention has wide applications, and can also be used as a component of a filtering device, and has good application in particular in a tap water network.

[0069] In summary, the pre-filter of the present invention utilizes natural water power to drive the central filter screen of the pre-filter to rotate, and utilizes the dynamic friction on the filter screen surface to reduce the retention of scale, thereby solving the problem that the filter element is easy to scale and inconvenient to clean, and at the same time improves the convenience of equipment use.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pre-filter, characterized in that: include: A filter element and a flow guide portion mounted on the filter element; The guide part rotates axially under the impact of water inflow to drive the filter element to rotate; The guide part comprises a guide impeller mounted on the top of the filter element, and the guide impeller is arranged concentrically with the filter element; The guide part also includes a guide frame arranged on the upper part of the guide impeller, and the guide frame is used to guide the incoming water to the guide impeller; The guide frame is provided with a spiral water inlet channel, and the outlet of the spiral water inlet channel is directly facing the blades of the guide impeller; It also includes a fixed shaft and a rotating shaft, wherein the fixed shaft is installed on the inner side of the guide frame; the rotating shaft is installed on the top of the filter element, and the fixed shaft is stacked and arranged on the upper part of the rotating shaft; Wherein, the contact surface between the fixed axis and the rotating axis is a conical surface.

2. The pre-filter according to claim 1, characterized in that: A positioning spring for buffering hard pressure impact is arranged above the fixed shaft.

3. The pre-filter according to claim 1, characterized in that: The filter element comprises a frame and a filter screen wrapped on the frame, and a plurality of water inlet holes are evenly distributed on the side wall of the frame.

4. The pre-filter according to claim 3, characterized in that: The diameter of the water inlet hole on the outer wall of the frame is larger than the diameter of the water inlet hole on the inner wall of the frame.

5. The pre-filter according to claim 3, characterized in that: A base is provided at the bottom of the frame, and the base is used to support the frame.

6. The pre-filter according to claim 3, characterized in that: The invention also comprises a bottle-shaped shell, wherein the bottle-shaped shell is covered on the outer side of the frame.

7. A filtering device comprising the pre-filter according to any one of claims 1 to 6.

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