Composite filter element and water purifying device

Abstract

The utility model discloses a composite filter element and water purification plant, composite filter element includes filter flask, filter flask lid and at least two spacer bush, at least two spacer bush divide the internal space of filter flask into at least three mutually nested space, three space are respectively configured into first filter element accommodation space, second filter element accommodation space, water storage chamber, the first filter element accommodating space is isolated from the second filter element accommodating space, and the second filter element accommodating space is connected with a water outlet of the water storage accommodating cavity through a one-way valve. The composite filter element has a higher integration level and a more simplified element replacement link, and the service life of the filter element can be fully and effectively utilized.

Description

Technical Field

[0001] This utility model relates to the field of water purifier technology, and in particular to a composite filter element and a water purification device. Background Technology

[0002] In recent years, in order to facilitate installation, save space, and conserve resources, water purifiers have become increasingly integrated in design. Most water purifiers have evolved from the initial 5-stage filter cartridges (PP cotton + granular activated carbon + PP cotton + RO / NF membrane + post-granular activated carbon) to 3-stage filter cartridges (pre-filter composite cartridge + RO / NF membrane + post-filter cartridge). The replacement frequency of pre- and post-filter cartridges has been optimized from 4 cartridges / year to 2 cartridges / year. This integration saves space, simplifies the after-sales cartridge replacement process, and saves resources while reducing replacement costs.

[0003] To further improve the integration of filter cartridges and simplify cartridge replacement, the water purification industry has seen the emergence of a single-cartridge design (pre-filter + membrane + post-filter composite). However, the single-cartridge design is limited by the activated carbon in the pre-filter and post-filter cartridges or the filtration life of the pre-filter cartridge. The most expensive membrane element (such as RO and NF membranes) may not be fully utilized, resulting in waste. Summary of the Invention

[0004] To address the problems of existing technologies, this utility model aims to propose a composite filter element and water purification device, which has a high degree of integration, a simple filter element replacement process, and can more effectively utilize the service life of the filter element.

[0005] To achieve the above objectives, the composite filter element proposed in this utility model includes a filter bottle, a filter bottle cap, and at least two spacers. The at least two spacers divide the internal space of the filter bottle into at least three nested spaces. The three spaces are respectively configured as a first filter element receiving space, a second filter element receiving space, and a water storage chamber. The first filter element receiving space and the second filter element receiving space are isolated from each other. The second filter element receiving space is connected to the outlet of the water storage chamber through a one-way valve.

[0006] In one embodiment, the composite filter element is provided with a first filter element inlet, a second filter element inlet, a first filter element outlet, a second filter element outlet, and a third filter element outlet.

[0007] In one embodiment, the inlet of the second filter element receiving space is connected to the inlet of the second filter element, and the outlet of the second filter element receiving space is connected to the outlet of the third filter element.

[0008] In one embodiment, the inlet of the first filter element receiving space is connected to the first filter element inlet, the outlet of the first filter element receiving space is connected to the inlet of the water storage cavity, and simultaneously connected to the outlet of the second filter element.

[0009] In one embodiment, the filter bottle is provided with a branch flow channel, which is located between the water outlet side of the first filter element and the water outlet of the second filter element within the first filter element receiving space.

[0010] In one embodiment, the outlet of the water storage cavity is connected to the outlet of the first filter element.

[0011] In one embodiment, the outer side of the first filter element receiving space is the first of at least two partitions. The first filter element has an upper end cover and a lower end cover. The upper end cover and the first partition form a water inlet channel for the first filter element. A sealing mechanism is provided between the lower end cover and the first partition.

[0012] In one embodiment, the inner side of the first filter element receiving space is the second of at least two spacers, and the second spacer forms the second filter element receiving space.

[0013] In one embodiment, a water storage cavity is formed between the outer side of the first septum and the filter bottle.

[0014] In one embodiment, a one-way valve is disposed between the outlet of the second filter element receiving space and the outlet of the third filter element.

[0015] In one embodiment, the first filter element inlet, the second filter element inlet, the first filter element outlet, the second filter element outlet, and the third filter element outlet are located on the filter bottle cap.

[0016] In one embodiment, the inner side of the first filter element receiving space is the second of at least two partitions, and the second partition has a central tube inside, forming a water storage cavity between the second partition and the central tube.

[0017] In one embodiment, a second filter element receiving space is formed between the outer side of the first septum and the filter bottle. The second filter element receiving space is connected to one end of the central tube and is connected to the water storage chamber through a one-way valve located at the other end of the central tube.

[0018] In one embodiment, a branch flow channel is formed between the inner wall of the second filter element within the second filter element receiving space and the first spacer.

[0019] In one embodiment, the inner side of the first filter element receiving space is a third partition, and the second partition of at least two partitions is disposed inside the third partition, forming a second filter element receiving space inside the second partition, and a water storage cavity is formed between the outer side of the second partition and the third partition.

[0020] In one embodiment, a branch flow channel is formed between the outer side of the first septum and the filter bottle.

[0021] In one embodiment, a one-way valve is disposed at one end of the second filter element receiving space near the filter bottle cap.

[0022] In one embodiment, the first filter element inlet, the first filter element outlet, and the second filter element outlet are disposed on the filter bottle cover, and the second filter element inlet and the third filter element outlet are disposed on the composite filter element at the end opposite to the filter bottle cover.

[0023] In one embodiment, the first filter element disposed in the first filter element receiving space is PP activated carbon, PP activated carbon fiber, or a composite filter element of PP activated carbon fiber and scale inhibitor, and the second filter element disposed in the second filter element receiving space is granular activated carbon, carbon rod, or a composite filter element of granular activated carbon and ultrafiltration / microfiltration, or a composite filter element of carbon rod and ultrafiltration / microfiltration.

[0024] This utility model also proposes a water purification device, which includes the above-mentioned composite filter element.

[0025] Beneficial effects:

[0026] (1) The composite filter element of this utility model integrates the first filter element and the second filter element into one, which improves the integration of the filter element and makes the overall layout of the water purification device more compact.

[0027] (2) This utility model integrates the first and second filter elements with similar service lives into one unit, and separates them from the membrane filter elements with different service lives. When changing the filter elements, the first and second filter elements can be replaced together without affecting the use of the separately set membrane filter elements. This simplifies the filter element replacement process, reduces the cost of use, and also allows the membrane filter elements to be fully utilized, avoiding the waste of membrane filter elements caused by replacing all three filter elements together.

[0028] (3) The composite filter element of this utility model is provided with a pure water return branch for TDS flushing, which facilitates TDS flushing of the membrane filter element, thereby preventing TDS rise and ensuring the quality of purified water. Attached Figure Description

[0029] The present invention will be further described and explained below with reference to the accompanying drawings.

[0030] Figure 1 This is a front view of the composite filter element according to the preferred embodiment of this utility model.

[0031] Figure 2 yes Figure 1 A cross-sectional view of a composite filter element.

[0032] Figure 3 This is a front view of the second embodiment of the composite filter element.

[0033] Figure 4 yes Figure 3 A cross-sectional view of the composite filter element in the image.

[0034] Figure 5This is a cross-sectional view of the third embodiment of the composite filter element.

[0035] Figure label:

[0036] 100 Composite filter element; 101 Filter bottle; 102 Filter bottle cap; 01 First filter element receiving space; 02 Second filter element receiving space; 03 Water storage cavity; 1a First filter element inlet; 1b Second filter element inlet; 1c First filter element outlet; 1d Second filter element outlet; 1e Third filter element outlet; 10 First filter element; 20 Second filter element; 11 Upper end cap; 12 Lower end cap; 13 Water inlet channel of the first filter element; 14 Water outlet channel of the first filter element; 15 Sealing mechanism; 21 Water inlet channel of the second filter element; 22 Water outlet of the second filter element; 31 Water inlet of the water storage cavity; 32 Water outlet of the water storage cavity; 51 First partition sleeve; 52 Second partition sleeve; 53 Third partition sleeve; 6 One-way valve; 7 Central pipe; 8 Branch channel. Detailed Implementation

[0037] The technical solution of this utility model will be more clearly and completely explained below with reference to the accompanying drawings and through the description of the preferred embodiments of this utility model.

[0038] This utility model proposes a composite filter element, which includes a filter bottle and at least two spacers. The at least two spacers divide the internal space of the filter bottle into at least three nested spaces. The three spaces are respectively configured as a first filter element receiving space, a second filter element receiving space, and a water storage cavity. The first filter element receiving space and the second filter element receiving space are isolated from each other. The second filter element receiving space is connected to the outlet of the water storage cavity through a one-way valve.

[0039] The composite filter element of this utility model integrates the first filter element and the second filter element into one unit, which improves the integration of the filter element, reduces the replacement cost, and also enables the rinsing function of the membrane element connected to it, preventing the TDS of the membrane element from rising.

[0040] like Figure 1 and Figure 2 In the preferred embodiment shown, the composite filter element 100 includes a filter bottle 101 and a filter bottle cap 102. The filter bottle cap 102 is installed on the filter bottle 101 to form an internal cavity. Two spacers are provided in the internal cavity, namely a first spacer 51 and a second spacer 52. The two spacers divide the internal cavity into three nested spaces. The three spaces are respectively configured as a first filter element receiving space 01, a second filter element receiving space 02, and a water storage cavity 03. The first filter element receiving space 01 and the second filter element receiving space 02 are isolated from each other. The second filter element receiving space 02 is connected to the outlet of the water storage cavity 03 through a one-way valve 6.

[0041] The filter bottle cap 102 is provided with a first filter element inlet 1a, a second filter element inlet 1b, a first filter element outlet 1c, a second filter element outlet 1d, and a third filter element outlet 1e.

[0042] The first spacer 51 and the second spacer 52 are nested within the internal cavity of the composite filter element 100, with the second spacer 52 located inside the first spacer 51. A second filter element receiving space 02 is formed within the second spacer 52 to receive the second filter element 20. The space between the first spacer 51 and the second spacer 52 forms a first filter element receiving space 01 to receive the first filter element 10. A water storage cavity 03 is formed between the outer side of the first spacer 51 and the filter bottle 101.

[0043] The first filter element 10 has an upper end cap 11 and a lower end cap 12. The upper end cap 11 and the first spacer 51 form a water inlet channel 13 for the first filter element, and the inner side of the first filter element 10 and the outer side of the second spacer 52 form a water outlet channel 14 for the first filter element 10. A sealing mechanism 15 is provided between the lower end cap 12 and the first spacer 51 to prevent water in the water inlet channel 13 from crossing with water in the water outlet channel 14.

[0044] The inlet of the first filter element receiving space 01 is connected to the first filter element inlet 1a, allowing the raw water to be purified to enter the first filter element receiving space 01 from the first filter element inlet 1a, and further enter the inlet channel 13 of the first filter element, where it is filtered by the first filter element 10. The outlet channel 14 of the first filter element 10 is connected to the inlet 31 of the water storage chamber 03, and the outlet 32 ​​of the water storage chamber 03 is connected to the outlet 1c of the first filter element, so that the water filtered by the first filter element 10 passes through the water storage chamber 03 and is discharged from the outlet 1c of the first filter element, entering the external filter element (not shown) for the next stage of filtration; at the same time, the outlet channel 14 of the first filter element 10 is connected to the outlet 1d of the second filter element. Further, in this embodiment, the inlet 31 of the water storage cavity 03 is located at its lower end, and the outlet 32 ​​is located at its upper end; the lower end of the outlet channel 14 of the first filter element 10 is connected to the inlet 31 of the water storage cavity 03, so that water filtered by the first filter element 10 can flow into the water storage cavity 03; the upper end of the outlet channel 14 of the first filter element 10 is connected to the outlet 1d of the second filter element, so that water filtered by the first filter element 10 can flow to the outlet 1d of the second filter element, and flow out of the composite filter element 100 from the outlet 1d of the second filter element, and then flow to the external filter element for producing pure water for TDS rinsing. The outlet 1d of the second filter element serves as a branch outlet for TDS rinsing. In this embodiment, during TDS rinsing, the outlet channel 14 of the first filter element 10 also serves as a branch channel for TDS rinsing. The external filter element here can be a membrane filter element.

[0045] A water inlet channel 21 for the second filter element 20 is formed between the outer side of the second filter element 20 and the inner side of the second partition 52. The water inlet of the second filter element receiving space 02 is connected to the water inlet 1b of the second filter element, so that water filtered by the external filter element can enter the second filter element receiving space 02 from the water inlet 1b of the second filter element, and further enter the water inlet channel 21 of the second filter element, where it is filtered by the second filter element 20. The water outlet 22 of the second filter element receiving space 02 is connected to the water outlet 1e of the third filter element, so that pure water filtered by the second filter element can be discharged from the composite filter element 100 from the water outlet 1e of the third filter element for user use.

[0046] The second filter element receiving space 02 is connected to the outlet 31 of the water storage chamber 03 via a one-way valve 6. Specifically, the one-way valve 6 is installed in the pure water flow channel from the outlet 22 of the second filter element receiving space 02 to the outlet 1e of the third filter element, and is used to unidirectionally guide the outlet 32 ​​of the outermost water storage chamber 03, forming a pure water return branch during TDS rinsing, so that pure water can flow back into the water storage chamber 03. In this way, pure water can be used for TDS rinsing of the external membrane filter element.

[0047] like Figures 3 to 4 In the second embodiment shown, a first partition 51 and a second partition 52 are provided in the internal cavity of the composite filter element 100. The two partitions divide the internal cavity into three nested spaces. The three spaces are respectively configured as a first filter element receiving space 01, a second filter element receiving space 02, and a water storage cavity 03. The first filter element receiving space 01 and the second filter element receiving space 02 are isolated from each other. The second filter element receiving space 02 is connected to the outlet 32 ​​of the water storage cavity 03 through a one-way valve 6.

[0048] The inlet and outlet ports of the first filter element 10 and the second filter element 20 are respectively located at both ends of the composite filter element 100. Specifically, the filter bottle cover 102 is provided with the inlet and outlet ports of the first filter element 10, namely the first filter element inlet 1a, the first filter element outlet 1c, and the second filter element outlet 1d; the other end of the composite filter element 100 opposite to the filter bottle cover 102 is provided with the inlet and outlet ports of the second filter element 20, namely the second filter element inlet 1b and the third filter element outlet 1e.

[0049] The first spacer 51 and the second spacer 52 are nested within the internal cavity of the composite filter element 100, with the second spacer 52 located inside the first spacer 51. A water storage cavity 03 is formed within the second spacer 52, and a central tube 7 is disposed at the center of the water storage cavity 03. The space between the first spacer 51 and the second spacer 52 forms a first filter element receiving space 01 for accommodating the first filter element 10. A second filter element receiving space 02 is formed between the outer side of the first spacer 51 and the filter bottle 101 for accommodating the second filter element 20.

[0050] The upper and lower end caps, water inlet channel, water outlet channel, and sealing mechanism of the first filter element 10 are configured in the same way as in the preferred embodiment described above.

[0051] In this embodiment, the second filter element 20 is located around the first filter element 10. A water inlet channel 21 is formed between the outer side of the second filter element 20 and the inner side of the filter bottle 101, connecting the inlet of the second filter element receiving space 02 and the second filter element inlet 1b. The outlet of the second filter element receiving space 02 is connected to the outlet 1e of the third filter element. Simultaneously, the second filter element receiving space 02 is unidirectionally connected to the outlet 32 ​​of the water storage chamber 03 via the central pipe 7 and a one-way valve 6 located at the upper end of the central pipe. The central pipe 7 constitutes a pure water return branch during TDS rinsing.

[0052] A branch flow channel 8 is formed between the inner wall of the second filter element 20 and the first partition 51. The inlet of the branch flow channel 8 is connected to the outlet of the first filter element receiving space 01, and the outlet of the branch flow channel 8 is connected to the outlet 1d of the second filter element, for TDS rinsing of the external filter element.

[0053] like Figure 5 In the third embodiment shown, the internal cavity of the composite filter element 100 is provided with a first partition 51, a second partition 52, and a third partition 53. The three partitions divide the internal cavity into four nested spaces. The four spaces are respectively configured as a first filter element receiving space 01, a second filter element receiving space 02, a water storage cavity 03, and a branch flow channel 8. The first filter element receiving space 01 and the second filter element receiving space 02 are isolated from each other. The second filter element receiving space 02 is connected to the outlet 32 ​​of the water storage cavity 03 through a one-way valve 6.

[0054] The inlet and outlet ports of the first filter element 10 and the second filter element 20 are respectively located at both ends of the composite filter element 100, and the specific arrangement is as described in the second embodiment above.

[0055] The first spacer 51, the second spacer 52, and the third spacer 53 are nested within the internal cavity of the composite filter element 100. The third spacer 53 is located inside the first spacer 51, and the second spacer 52 is located inside the third spacer 53. A second filter element receiving space 02 is formed within the second spacer 52 to receive the second filter element 20. The space between the third spacer 53 and the second spacer 52 forms a water storage cavity 03. The space between the first spacer 51 and the third spacer 53 forms a first filter element receiving space 01 to receive the first filter element 10. A branch flow channel 8 is formed between the outer side of the first spacer 51 and the filter bottle 101.

[0056] The upper and lower end caps, water inlet channel, water outlet channel, and sealing mechanism of the first filter element 10 are configured in the same way as in the preferred embodiment and the second embodiment described above. The water circuit connection of the first filter element 10, that is, its connection with its inlet and outlet and water storage cavity, is the same as in the second embodiment described above.

[0057] In this embodiment, the second filter element 20 is located at the center of the composite filter element 100, the water storage cavity 03 is located around the second filter element 20, the first filter element 10 is located around the water storage cavity 03, and the branch flow channel 8 is located around the first filter element 10. A one-way valve 6 is located at the upper end of the second filter element receiving space 02. The space between the inlet of the second filter element receiving space 02 and the second filter element 20 is unidirectionally connected to the outlet 32 ​​of the water storage cavity 03 through the one-way valve 6, for pure water recirculation during TDS rinsing of the external filter elements.

[0058] In this invention, the first filter element 10 is a composite filter element of PP activated carbon, PP activated carbon fiber, or PP activated carbon fiber and scale inhibitor, and the second filter element 20 is a composite filter element of granular activated carbon, carbon rod, or granular activated carbon and ultrafiltration / microfiltration, or a composite filter element of carbon rod and ultrafiltration / microfiltration.

[0059] The working principle of the composite filter element of this utility model is as follows:

[0060] During normal pure water production, external raw water enters the inlet channel 13 of the first filter element housing space 01 through the inlet 1a of the first filter element. After being filtered by the first filter element 10, it enters the outlet channel 14 of the first filter element 10, then enters the water storage chamber 03 through the inlet of the water storage chamber 03, and is discharged from the outlet of the water storage chamber 03. It then exits the composite filter element 100 through the outlet 1c of the first filter element and enters the external membrane filter element for the next stage of filtration. The pure water filtered by the external membrane filter element enters the second filter element housing space 02 through the inlet 1b of the second filter element. After being filtered by the second filter element 20, it is discharged from the outlet of the second filter element housing space 02, and then discharged through the outlet 1e of the third filter element for user use.

[0061] When producing pure water for rinsing, external raw water enters the inlet channel 13 of the first filter element's containing space 01 through the inlet 1a of the first filter element. After being filtered by the first filter element 10, it enters the outlet channel 14 of the first filter element 10 and then enters the branch channel 8. The water in the branch channel 8 is discharged from the outlet 1d of the second filter element and flows into the external membrane filter element. After being filtered by the membrane filter element, the pure water enters the containing space 02 of the second filter element through the inlet 1b of the second filter element. After being filtered by the second filter element 20, under the one-way conduction of the one-way valve 6, it flows back into the water storage chamber 03 from the outlet, i.e., pure water recirculation. The outlet chamber 03 is gradually filled. When it is filled, the excess pure water mixes into the branch channel 8.

[0062] During TDS flushing, the water filtered by the first filter element 10 enters the water storage chamber 03, and the pure water in the water storage chamber 03 is pushed out. The pure water is discharged from the composite filter element through the outlet 1c of the first filter element and flows into the external membrane filter element to perform TDS pure water flushing on the membrane filter element to prevent the TDS of the membrane filter element from rising.

[0063] The composite filter element of this invention integrates the first and second filter elements into one unit, while keeping them separate from the membrane filter element. This fully utilizes the fact that the first and second filter elements have similar service lives, while the membrane filter element has a longer service life. When replacing the filter elements, the first and second filter elements can be replaced simultaneously without affecting the use of the membrane filter element. On the one hand, this simplifies the filter element replacement process and reduces operating costs; on the other hand, it fully utilizes the service life of the membrane filter element, avoiding unnecessary waste caused by replacing three filter elements at once without fully utilizing the membrane filter element. In addition, the composite filter element of this invention also takes into account the TDS flushing of the membrane filter element in its structural design. TDS flushing of the membrane filter element is achieved through a pure water return branch, preventing TDS rise and ensuring the quality of water purification.

[0064] This utility model also proposes a water purification device, which includes the above-mentioned composite filter element 100 and an external membrane filter element to achieve three-stage filtration of water.

[0065] The above-described specific embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Various modifications, substitutions, and improvements made by those skilled in the art to the technical solutions of the present invention based on the provided description and drawings, without departing from the design concept and spirit of the present invention, should all fall within the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims.

Claims

1. A composite filter element, characterized in that, The composite filter element includes a filter bottle, a filter bottle cap, and at least two spacers. The at least two spacers divide the internal space of the filter bottle into at least three nested spaces. The three spaces are respectively configured as a first filter element receiving space, a second filter element receiving space, and a water storage chamber. The first filter element receiving space and the second filter element receiving space are isolated from each other. The second filter element receiving space is connected to the outlet of the water storage chamber through a one-way valve.

2. The composite filter element as described in claim 1, characterized in that, The composite filter element is provided with a first filter element inlet, a second filter element inlet, a first filter element outlet, a second filter element outlet, and a third filter element outlet.

3. The composite filter element as described in claim 2, characterized in that, The inlet of the second filter element receiving space is connected to the inlet of the second filter element, and the outlet of the second filter element receiving space is connected to the outlet of the third filter element.

4. The composite filter element as described in claim 3, characterized in that, The inlet of the first filter element receiving space is connected to the inlet of the first filter element, the outlet of the first filter element receiving space is connected to the inlet of the water storage cavity, and is also connected to the outlet of the second filter element.

5. The composite filter element as described in claim 4, characterized in that, The filter bottle is provided with a branch flow channel, which is located between the water outlet side of the first filter element and the water outlet of the second filter element within the first filter element accommodating space.

6. The composite filter element as described in claim 5, characterized in that, The outlet of the water storage cavity is connected to the outlet of the first filter element.

7. The composite filter element as described in claim 6, characterized in that, The outer side of the first filter element accommodating space is the first of at least two spacers. The first filter element has an upper end cover and a lower end cover. The upper end cover and the first spacer form a water inlet channel for the first filter element. A sealing mechanism is provided between the lower end cover and the first spacer.

8. The composite filter element as described in claim 7, characterized in that, The inner side of the first filter element receiving space is the second of at least two spacers, and the second filter element receiving space is formed inside the second spacer.

9. The composite filter element as described in claim 8, characterized in that, The water storage cavity is formed between the outer side of the first diaphragm and the filter bottle.

10. The composite filter element as described in claim 9, characterized in that, The one-way valve is located between the outlet of the second filter element housing and the outlet of the third filter element.

11. The composite filter element as described in claim 10, characterized in that, The first filter element inlet, the second filter element inlet, the first filter element outlet, the second filter element outlet, and the third filter element outlet are located on the filter bottle cap.

12. The composite filter element as described in claim 7, characterized in that, The inner side of the first filter element accommodating space is the second of at least two of the aforementioned spacers, and the second spacer is provided with a central tube, forming the water storage cavity between the second spacer and the central tube.

13. The composite filter element as described in claim 12, characterized in that, The second filter element receiving space is formed between the outer side of the first diaphragm and the filter bottle. The second filter element receiving space is connected to one end of the central tube and is connected to the water storage cavity through the one-way valve provided at the other end of the central tube.

14. The composite filter element as described in claim 13, characterized in that, The branch flow channel is formed between the inner wall of the second filter element and the first spacer within the second filter element accommodating space.

15. The composite filter element as described in claim 7, characterized in that, The inner side of the first filter element receiving space is a third partition, and the second partition of at least two partitions is disposed inside the third partition. The second partition forms the second filter element receiving space, and the water storage cavity is formed between the outer side of the second partition and the third partition.

16. The composite filter element as described in claim 15, characterized in that, The branch flow channel is formed between the outer side of the first septum and the filter bottle.

17. The composite filter element as described in claim 16, characterized in that, The one-way valve is located at one end of the second filter element receiving space near the filter bottle cap.

18. The composite filter element as described in claim 14 or 17, characterized in that, The first filter element inlet, the first filter element outlet, and the second filter element outlet are located on the filter bottle cover, and the second filter element inlet and the third filter element outlet are located on the composite filter element at the end opposite to the filter bottle cover.

19. The composite filter element as described in claim 1, characterized in that, The first filter element disposed in the first filter element accommodating space is PP activated carbon, PP activated carbon fiber, or a composite filter element of PP activated carbon fiber and scale inhibitor. The second filter element disposed in the second filter element accommodating space is granular activated carbon, carbon rod, or a composite filter element of granular activated carbon and ultrafiltration / microfiltration, or a composite filter element of carbon rod and ultrafiltration / microfiltration.

20. A water purification device, characterized in that, Includes the composite filter element as described in any one of claims 1 to 19.

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