Composite filtering device

Abstract

The utility model provides a composite filtering device which comprises a tank body with an opening in the upper portion, the opening end of the tank body is connected with a cover body, the lower end of the cover body is provided with a mixing cavity communicated with an inner cavity of the tank body, and the cover body is provided with a water inlet and a water outlet which are communicated with the mixing cavity. The lower end of the cover body is further connected with a filter pipe which extends into the tank body and is communicated up and down, the filter pipe is filled with a first filter medium, a second filter medium is contained in the tank body, the lower end of the filter pipe extends into the second filter medium, and the upper end of the filter pipe is communicated to the water outlet. The composite filtering device disclosed by the utility model is high in filtering precision, low in filtering medium cleaning frequency and capable of saving labor cost.

Description

Technical Field

[0001] This utility model relates to the technical field of swimming pool water filtration equipment, and more specifically, to a composite filtration device. Background Technology

[0002] Sand filters are widely used in various water purification and circulation systems, such as swimming pools, water parks, and drinking water pretreatment. Their main working principle relies on the pressure of a water pump to remove tiny contaminants from the pool water through the filter sand. The filter sand is filled into the chamber of the filter; the sand tank typically contains a certain amount of quartz sand, usually more than two-thirds of its volume. When the system is operating normally, pool water containing suspended particulate matter is pumped into the filter from the inlet. The tiny contaminants are captured and removed by the sand bed. The filtered water then enters the water system pipeline from the outlet, is sterilized, and returned to the pool. This device, which uses filter sand as a medium, has relatively low filtration accuracy. Furthermore, after a period of use, the contaminants accumulated in the sand tank can impede water flow, weakening the filter. At this point, the filter sand needs to be cleaned. Since quartz sand is heavy, emptying it from the tank for cleaning is inconvenient.

[0003] Currently, there are other alternatives on the market, such as replacing the filter sand in the tank with filter cotton balls that have higher filtration precision, using multiple layers of filter cotton balls to filter the pool water. Although filter cotton balls are lighter and easier to remove and clean than filter sand, they are more prone to accumulating contaminants, thus requiring more frequent cleaning and increasing workload.

[0004] Therefore, in view of the various shortcomings of the existing technology, the applicant aims to develop a composite filtration device that can not only ensure a stable filtration effect, but also reduce the workload of cleaning and maintenance. Summary of the Invention

[0005] To overcome at least one of the defects in the prior art, this utility model provides a composite filtration device with high filtration accuracy, low frequency of filter media cleaning, and reduced labor costs.

[0006] This utility model provides a composite filtration device: it includes a tank with an open top, a cover connected to the open end of the tank, a mixing chamber communicating with the inner cavity of the tank at the lower end of the cover, an inlet and an outlet communicating with the mixing chamber on the cover, and a filter tube extending into the tank and communicating vertically at the lower end of the cover. The filter tube is filled with a first filter medium, the tank contains a second filter medium, the lower end of the filter tube extends into the second filter medium, and the upper end communicates with the outlet.

[0007] Compared with the prior art, the composite filtration device of this utility model has the following advantages:

[0008] This novel composite filtration device comprises two stages of filtration. The first stage involves a second filter medium filling the inner cavity of the tank, while the second stage involves a first filter medium filling the filter tube, with the lower end of the filter tube extending into the second filter medium pad. During operation, pool water, pumped under pressure by a water pump, flows from the inlet through the mixing chamber into the inner cavity of the tank. The second filter medium in the tank performs the first stage of filtration. The filtered water then passes through the filter tube again, undergoing the second stage of filtration by the first filter medium. Finally, the filtered water exits from the outlet, undergoes appropriate sterilization and disinfection, and is then returned to the pool. This structure, with its two filtration stages, effectively improves filtration accuracy. Furthermore, cleaning is no longer done by cleaning the entire tank with filter cotton balls, but only by cleaning a small amount of the first filter medium in the filter tube, resulting in a short cleaning time. Additionally, the dual filtration reduces the frequency of cleaning the second filter medium in the first stage, further reducing workload.

[0009] As an improvement, a first filter screen is connected to the lower end of the filter tube, and the lower end of the first filter screen is inserted and positioned at the bottom of the tank. In the above improved structure, the first filter screen can further block large particulate pollutants from entering the filter tube, reducing the frequency of filter cotton ball cleaning.

[0010] In a further improvement, the upper end of the first filter screen is provided with a funnel-shaped first connector, and the upper end of the first connector is provided with a first positioning tube; the lower end of the cover is connected to a second connector that communicates with the water outlet and is in the shape of an inverted funnel, and the lower end of the second connector is provided with a second positioning tube, and the upper and lower ends of the filter tube are respectively detachably inserted into the second positioning tube and the first positioning tube.

[0011] In a further improvement, the lower end of the cover is connected to a second filter screen housed within the tank. The upper open end of the second filter screen is connected to the lower open end of the mixing chamber, and a insertion hole is provided at the bottom of the second filter screen. The upper end of the second connector is inserted into the insertion hole. In this improved structure, the second filter screen performs preliminary filtration before the pool water enters the tank, improving filtration accuracy and reducing the frequency of filter sand cleaning.

[0012] In a further improvement, the first filter medium is a filter cotton ball, and the second filter medium is filter sand. A backwash inlet communicating with the mixing chamber is also provided on the side wall of the cover. The mixing chamber is equipped with a valve assembly for switching between the filter channel and the backwash channel. When the valve assembly is adjusted to allow the backwash channel to connect, the flushing water can enter the mixing chamber from the backwash inlet, then pass through the filter pipe and the inner cavity of the tank before flowing out from the inlet. In this improved structure, the valve assembly enables flexible switching between the filter channel and the backwash channel. The backwash mode can clean the filter sand without needing to empty it for cleaning, saving time and effort.

[0013] Alternatively, this utility model provides a composite filtration device with another structure: it includes a tank with an open top, a cover connected to the open end of the tank, a mixing chamber communicating with the inner cavity of the tank at the lower end of the cover, an inlet and an outlet communicating with the mixing chamber on the cover, a second filter medium contained in the tank, a drain pipe provided in the tank, the lower end of the drain pipe extending into the second filter medium, and the upper end communicating with the inner end of the outlet; a filter pipe connected to the outer end of the outlet, the filter pipe being filled with a first filter medium.

[0014] As an improvement, the lower end of the drain pipe is connected to a first filter screen, and the lower end of the first filter screen is inserted and positioned at the bottom of the tank; the lower end of the cover is connected to a second filter screen that is housed in the tank, the upper opening end of the second filter screen is connected to the lower opening end of the mixing chamber, and the bottom of the second filter screen has an insertion hole, into which the upper end of the drain pipe is inserted.

[0015] In a further improvement, the first filter medium is a filter cotton ball, and the second filter medium is filter sand; a backwash inlet communicating with the mixing chamber is also provided on the side wall of the cover; the mixing chamber is equipped with a valve assembly for switching the filter channel and the backwash channel; and when the valve assembly is adjusted to connect the backwash channel, the flushing water can enter the mixing chamber from the backwash inlet, then enter the inner cavity of the tank through the drain pipe, and finally flow out from the inlet.

[0016] Other improvements and advantages of this invention will be set forth in the detailed description that follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures particularly pointed out in the description and drawings. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the composite filtration device of this utility model;

[0018] Figure 2 This is a vertical sectional view of the composite filtration device of this utility model;

[0019] Figure 3 This is a vertical sectional view of the composite filtration device of this utility model from another angle;

[0020] Figure 4 This is an exploded view of the connection structure between the tank and the base in this utility model;

[0021] Figure 5 This is a cross-sectional view of the structure of Embodiment 2 of the composite filtration device of this utility model;

[0022] Figure 6 This is another structural cross-sectional view of Embodiment 2 of the composite filtration device of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Tank body; 2. Cover; 3. Inlet; 4. Outlet; 5. Filter tube; 6. Filter cotton ball; 7. First filter screen; 8. First connector; 9. First positioning tube; 10. Second connector; 11. Second positioning tube; 12. Second filter screen; 13. Backwash inlet; 14. Valve assembly; 15. Base; 16. Receiving groove; 17. Positioning hole; 18. Positioning post; 19. Limiting groove; 20. Limiting protrusion. Detailed Implementation

[0025] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0026] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "fixed" and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0027] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Example

[0028] See Figures 1-4As shown, this embodiment discloses a composite filtration device, including a tank 1 with an open top. A cover 2 is detachably connected to the open end of the tank 1 via a clamp. A mixing chamber communicating with the inner cavity of the tank 1 is recessed at the lower end of the cover 2. An inlet 3 and an outlet 4 communicating with the mixing chamber are provided on the side wall of the cover 2. Specifically, a filter pipe 5 is also connected to the lower end of the cover 2, extending downward along the inner cavity of the tank 1, and having communicating openings at both the top and bottom. That is, the filter pipe 5 is connected vertically. The filter tube 5 is filled with a first filter medium, preferably filter cotton balls 6, which are loosely packed and fill the entire volume of the filter tube 5. During filtration, water pressure compresses the filter cotton balls 6, so a certain buffer space is left inside the filter tube 5 during actual operation. Additionally, the tank 1 contains a second filter medium, preferably filter sand. This filter sand typically fills about two-thirds of the inner volume of the tank 1. The lower end of the filter tube 5 extends into the filter sand, and the upper end connects to the outlet 4. Furthermore, in this structure, the filtration accuracy of the filter cotton balls 6 is higher than that of the filter sand. The filter sand is used to filter contaminants larger than 0.08mm, while the filtration accuracy of the filter cotton balls 6 reaches 0.04mm.

[0029] In other embodiments, the first filter medium may also be other types of filamentous filter media, such as natural fiber balls or synthetic fiber balls. Because the second filter medium involves backwashing, it can be a granular medium such as coke, activated carbon, or glass shards; the backwashing structure is described later.

[0030] In operation, pool water, pumped under pressure by a water pump, flows from inlet 3 through the mixing chamber into the inner cavity of tank 1. The filter sand in tank 1 performs primary filtration of the pool water. The filtered water then passes through filter pipe 5 for secondary filtration by filter cotton balls 6. Finally, the filtered water is discharged from outlet 4, undergoes appropriate sterilization and disinfection, and is returned to the pool. This structure incorporates two filtration stages, effectively improving filtration accuracy. Furthermore, cleaning is no longer required for the entire tank 1's filter cotton balls 6, but only for a small number of filter cotton balls 6 in filter pipe 5, resulting in a short cleaning time. Additionally, the dual filtration system reduces the frequency of filter sand cleaning, further decreasing workload.

[0031] In this embodiment, more specifically, a backwash inlet 13 communicating with the mixing chamber is provided on the side wall of the shell, and a valve assembly 14 for switching the filter channel and the backwash channel is installed in the mixing chamber. When the valve assembly 14 is adjusted to connect the backwash channel, the flushing water can enter the mixing chamber from the backwash inlet 13, and then flow out from the inlet 3 after passing through the filter pipe 5 and the inner cavity of the tank 1 in sequence, thereby realizing the backwashing of the filter sand without having to pour it out for cleaning.

[0032] In the above structure, the filtration channel refers to the channel through which pool water flows during normal filtration. Specifically, the water enters the mixing chamber through inlet 3, then enters the inner cavity of tank 1, undergoes primary filtration with filter sand, enters the filter pipe 5 through the lower inlet for secondary filtration, and finally flows out from outlet 4. (See Appendix) Figure 2 The direction of the middle arrow.

[0033] The backwash channel refers to the flow of flushing water through the ventilation duct. External flushing water enters the mixer from the backwash inlet 13, then flows through the filter pipe 5 to the bottom of the inner cavity of the tank 1, and exits from the inlet 3. (See Appendix) Figure 3 The direction of the middle arrow indicates that this channel is mainly for backwashing the filter sand. Since the backwashing effect of filter cotton balls 6 is not good, they still need to be removed and cleaned. However, since the quantity is small and it is in the secondary filtration position, the cleaning frequency is not high and will not take up too much time.

[0034] In addition, the valve assembly 14 in the above structure is prior art developed by the applicant and has been granted a patent. For details, please refer to patent CN213088908U, which discloses a simple multi-functional valve for a pool filtration device. Channel switching can be achieved by pressing down and turning the knob, which is very convenient. This structure is not the focus of this application and will not be elaborated here.

[0035] In this embodiment, a first filter screen 7 is further connected to the lower end of the filter tube 5, and the lower end of the first filter screen 7 is inserted and positioned at the bottom of the tank body 1, which can improve the filtration effect and enhance the stability of the filter tube 5 structure.

[0036] In this embodiment, the first filter screen 7 includes a first cover and a second cover with a conical structure, which are connected vertically. The first cover and the second cover are fitted together along their larger diameter ends. The smaller diameter end (upper end) of the first cover is connected to the lower end of the filter pipe 5 through a first connecting pipe. The smaller diameter end (lower end) of the second cover is inserted and positioned into the bottom of the tank 1 through a second connecting pipe. In this structure, both the upper and lower halves of the first filter screen 7 are inclined structures, which ensures that water at the bottom of the tank can smoothly enter the filter pipe 5 while filtering large particulate impurities.

[0037] See appendix Figure 4In this embodiment, a base 15 is also provided at the bottom of the tank body 1, and an arc-shaped receiving groove 16 is formed concave on the upper end surface of the base 15. The bottom of the tank body 1 has an outwardly convex arc-shaped structure, and a positioning insertion hole 17 is provided at the bottom of the receiving groove 16. A positioning insertion post 18 is formed convexly on the bottom of the tank body 1. Two concave limiting grooves 19 are symmetrically provided on the inner wall of the positioning insertion hole 17. Correspondingly, two limiting protrusions 20 that cooperate with the limiting grooves 19 are formed on the outer wall of the positioning insertion post 18. During installation, the positioning insertion post 18 at the lower end of the tank body 1 is inserted into the positioning insertion hole 17 along the corresponding positions of the limiting protrusions 20 and the limiting grooves 19. Then, the base 15 is rotated until the upper end surface of the limiting protrusions 20 abuts against the lower end surface of the middle part of the base 15, thereby realizing the installation and fixation of the two parts. In this structure, the lower end surface of the middle part of the base 15 is higher than the lower end surface of its outer periphery.

[0038] In the above structure, a countersunk hole is provided at the bottom of the inner cavity of the tank body 1, and the countersunk hole extends axially along the positioning post 18 to form a plug-in hole. The plug-in hole and the positioning post 18 are integrally formed. The lower end of the first filter screen 7 is inserted and fitted into the plug-in hole. In this structure, the positioning post 18, which is protruding from the bottom of the tube body, realizes both the plug-in positioning with the base 15 and the plug-in positioning of the lower end of the first filter screen 7. The structure is reasonable and easy to process.

[0039] In another aspect, in this embodiment, a funnel-shaped first connector 8 is provided at the upper end of the first filter screen, and a first positioning tube 9 is provided at the upper end of the first connector 8; the lower end of the cover 2 is connected to a second connector 10 that communicates with the water outlet 4 and is in the shape of an inverted funnel, and a second positioning tube 11 is provided at the lower end of the second connector 10. The upper and lower ends of the filter tube 5 are detachably inserted into the second positioning tube 11 and the first positioning tube 9, respectively. When it is necessary to clean the filter cotton balls 6, after opening the cover 2, the filter tube 5, the first filter screen cover 7, and the second filter screen cover 12 can be taken out as a whole. Then, the second connector 10 can be disassembled to pour out the filter cotton balls 6 for cleaning, which is very convenient.

[0040] Furthermore, in this structure, due to the presence of the valve assembly 14, the upper end of the second connector 10 does not need to be directly connected to the outlet 4; it only needs to be connected to the mixing chamber. Channel switching can be achieved by operating the valve assembly 14. Specifically, a second filter screen 12, housed within the tank 1, is connected to the lower end of the cover 2. The upper opening of the second filter screen 12 is connected to the lower opening of the mixing chamber, and a insertion hole is provided at the bottom of the second filter screen 12. The upper end of the second connector 10 is inserted into the insertion hole. In this structure, after the pool water enters the mixing chamber from the inlet 3, it first undergoes preliminary filtration through the second filter screen 12 before entering the inner cavity of the tank 1. Preferably, the bottom cover of the water distribution plate of the valve assembly 14 can directly serve as the second filter screen 12, as specifically described in patent CN213088908U. Example

[0041] The general structure of this embodiment is the same as that of embodiment one, the only difference being the specific installation position of the filter tube 5. In embodiment one, the filter tube 5 is installed inside the tank 1, while in this embodiment, the filter tube 5 is installed outside the tank 1, specifically at the outer end of the outlet 4.

[0042] See appendix Figure 5 The filter tube 5 is directly connected to the outer end of the upper outlet 4 on the side wall of the cover 2. The filter tube 5 is also filled with filter cotton balls 6, and two funnel-shaped connectors are inserted at both ends of the filter tube 5.

[0043] See appendix Figure 6 The filter tube 5 can also be indirectly connected to the outer end of the water outlet 4 on the side wall of the cover 2 via a flexible hose. The filter tube 5 is also filled with filter cotton balls 6, and two funnel-shaped connectors are inserted at both ends of the filter tube 5.

[0044] Regardless of the connection structure, they all serve the function of secondary filtration. That is, the pool water inlet tank 1 is filtered through filter sand for primary filtration, and then the water outlet is filtered through filter cotton balls 6 for secondary filtration, effectively improving the filtration accuracy.

[0045] In the description of this application, the reference to terms such as "this embodiment" indicates that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0046] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A composite filtration device, comprising a tank (1) with an open top, wherein a cover (2) is connected to the open end of the tank (1), and a mixing chamber communicating with the inner cavity of the tank (1) is provided at the lower end of the cover (2), and an inlet (3) and an outlet (4) communicating with the mixing chamber are provided on the cover (2), characterized in that: The lower end of the cover (2) is also connected to a filter tube (5) that extends into the tank (1) and is connected vertically. The filter tube (5) is filled with a first filter medium, and the tank (1) contains a second filter medium. The lower end of the filter tube (5) extends into the second filter medium, and the upper end is connected to the water outlet (4).

2. The composite filtration device according to claim 1, characterized in that: The lower end of the filter tube (5) is connected to a first filter screen (7), and the lower end of the first filter screen (7) is inserted and positioned at the bottom of the tank (1).

3. The composite filtration device according to claim 2, characterized in that: The upper end of the first filter screen is provided with a funnel-shaped first connector (8), and the upper end of the first connector (8) is provided with a first positioning tube (9); the lower end of the cover (2) is connected to a second connector (10) that communicates with the water outlet (4) and is in the shape of an inverted funnel, and the lower end of the second connector (10) is provided with a second positioning tube (11). The upper and lower ends of the filter tube (5) are respectively detachably inserted into the second positioning tube (11) and the first positioning tube (9).

4. The composite filtration device according to claim 3, characterized in that: The lower end of the cover (2) is connected to a second filter screen (12) that is housed in the tank (1). The upper opening end of the second filter screen (12) is connected to the lower opening end of the mixing chamber. The bottom of the second filter screen (12) is provided with a plug hole, and the upper end of the second connector (10) is inserted into the plug hole.

5. The composite filtration device according to any one of claims 1 to 4, characterized in that: The first filter medium is a filter cotton ball (6), and the second filter medium is filter sand. The side wall of the cover (2) is also provided with a backwash inlet (13) that communicates with the mixing chamber. The mixing chamber is equipped with a valve assembly (14) for switching the filter channel and the backwash channel. When the valve assembly (14) is adjusted to connect the backwash channel, the flushing water can enter the mixing chamber from the backwash inlet (13), then enter the inner cavity of the tank (1) after passing through the filter pipe (5), and finally flow out from the water inlet (3) to realize the backwashing of the second filter medium.

6. A composite filtration device, comprising a tank (1) with an open top, a cover (2) connected to the open end of the tank (1), a mixing chamber communicating with the inner cavity of the tank (1) at the lower end of the cover (2), and an inlet (3) and an outlet (4) communicating with the mixing chamber on the cover (2), characterized in that: The tank (1) contains a second filter medium and a drain pipe (21) is provided inside the tank (1). The lower end of the drain pipe (21) extends into the second filter medium and the upper end is connected to the inner end of the outlet (4). The outer end of the outlet (4) is connected to a filter pipe (5) and the filter pipe (5) is filled with a first filter medium.

7. The composite filtration device according to claim 6, characterized in that: The lower end of the drain pipe (21) is connected to a first filter screen (7), and the lower end of the first filter screen (7) is inserted and positioned at the bottom of the tank (1); the lower end of the cover (2) is connected to a second filter screen (12) that is contained in the tank (1), the upper opening end of the second filter screen (12) is connected to the lower opening end of the mixing chamber, and the bottom of the second filter screen (12) is provided with a insertion hole, and the upper end of the drain pipe (21) is inserted into the insertion hole.

8. The composite filtration device according to claim 6 or 7, characterized in that: The first filter medium is a filter cotton ball (6), and the second filter medium is filter sand. The side wall of the cover (2) is also provided with a backwash inlet (13) that communicates with the mixing chamber. The mixing chamber is equipped with a valve assembly (14) for switching the filter channel and the backwash channel. When the valve assembly (14) is adjusted to connect the backwash channel, the flushing water can enter the mixing chamber from the backwash inlet (13), then enter the inner cavity of the tank (1) through the drain pipe (21), and finally flow out from the water inlet (3) to achieve backwashing of the second filter medium.

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