Multi-stage filter element connecting structure and water purifier

Abstract

The utility model relates to a multistage filter element connecting structure and a water purifier. Relates to the technical field of water purification equipment. The water purifier specifically comprises a plurality of filter elements, a plurality of connecting pipes used for connecting two adjacent filter elements and a plurality of water outlet pipes arranged on the connecting pipes respectively, each filter element is provided with a water inlet and a water outlet, one end of each connecting pipe is communicated with the water outlet of the previous filter element, and the other end of each connecting pipe is communicated with the water inlet of the next filter element. The water outlet pipe is used for discharging water from the previous filter element. The water outlet pipe comprises the water outlet pipe main body and the contraction section, the contraction section is arranged in the middle of the water outlet pipe main body, and the caliber of the contraction section is smaller than that of the water outlet pipe main body, so that when water filtered by the previous filter element flows through the water outlet pipe, the water outlet pressure of the contraction section is increased, and the water outlet flow speed is increased; therefore, the water outlet pressure and the water outlet flow speed of the multiple filter elements are increased, and the user experience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification equipment, in particular to a multi-stage filter element connection structure and a water purifier. Background Art

[0002] Since most of the water in the current municipal tap water pipe network is not directly drinkable, in order to meet the drinking standard, it needs to be purified. The existing water purifier realizes the purification of raw water by passing the raw water to be treated through a filter element with a filtering function. In order to obtain a better purification effect, the water purifier usually has multiple filter elements to comprehensively remove floating particulate matter, organic pollutants, residual chlorine and partial bacterial contamination in the raw water, so as to meet the standard of being directly drinkable, and at the same time has the effect of improving the taste of drinking water.

[0003] In the existing water purifier, the connection structure of multiple filter elements usually only realizes the connection between multiple filter elements. Therefore, multiple filter elements can only discharge water through a single water outlet, which cannot meet the different water use requirements of users. And setting multiple water outlets in the connection structure for the separate water discharge of multiple filter elements will disperse the water discharge pressure due to the multiple water outlets, resulting in a relatively small water discharge pressure at the water outlets of multiple filter elements, and further resulting in a slow water flow rate at the water outlets, reducing the user experience. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a multi-stage filter element connection structure and a water purifier for the deficiencies of the above-mentioned existing technologies, which can not only realize the separate water discharge of multiple filter elements to meet the different water discharge requirements of users, but also increase the water discharge pressure and water flow rate of multiple filter elements to improve the user experience.

[0005] The utility model provides a multi-stage filter element connection structure, including multiple filter elements, multiple connecting pipes for connecting two adjacent filter elements, and multiple water outlet pipes respectively arranged on the multiple connecting pipes. The filter element is provided with a water inlet and a water outlet. One end of the connecting pipe is communicated with the water outlet of the previous filter element, and the other end is communicated with the water inlet of the next filter element. The water outlet pipe is used for discharging the water of the previous filter element; the water outlet pipe includes a water outlet pipe main body and a contraction section arranged in the middle of the water outlet pipe main body, and the diameter of the contraction section is smaller than that of the water outlet pipe main body.

[0006] Further, the ratio of the diameter of the contraction section to that of the water outlet pipe main body is 1:3 - 5.

[0007] Further, the filter element includes a cylinder body with a flow-through cavity provided therein, and a filter screen with a plurality of filter holes. The filter screen forms a filtering cavity by surrounding the flow-through cavity in a circle. The plurality of filter holes communicate the flow-through cavity with the filtering cavity. The water inlet is communicated with the flow-through cavity, and the water outlet is communicated with the filtering cavity.

[0008] Further, the connecting pipe includes a water outlet joint connected to the cylinder body of the previous filter element, and a water inlet joint connected to the cylinder body of the next filter element. The water outlet joint is used to communicate one end of the connecting pipe with the water outlet of the previous filter element, and the water inlet joint is used to communicate the other end of the connecting pipe with the water inlet of the next filter element.

[0009] Further, the water outlet joint is integrally connected to the cylinder body of the previous filter element, and the water inlet joint is detachably connected to the cylinder body of the next filter element.

[0010] Further, a spiral channel is provided axially in the water inlet joint. The water inlet joint is connected to the cylinder body of the next filter element, and the spiral channel communicates the connecting pipe with the water inlet of the next filter element.

[0011] Further, the spiral angle of the spiral channel is 5° - 50°.

[0012] Further, a solenoid valve is provided on the contraction section, and the solenoid valve is used to control the opening or closing of the water outlet pipe.

[0013] Further, a water hammer elimination device is provided in the solenoid valve, and the water hammer elimination device is used to eliminate the water hammer effect in the pipeline.

[0014] The present utility model also provides a water purifier, which includes the multi-stage filter element connection structure as described above.

[0015] The multi-stage filter element connection structure and the water purifier of the present utility model have the following beneficial effects:

[0016] (1) The water outlet pipe of this connection structure includes a water outlet pipe main body and a contraction section. The contraction section is arranged in the middle of the water outlet pipe main body, and the diameter of the contraction section is smaller than that of the water outlet pipe main body. When the water flowing through the previous stage of filter element flows through the water outlet pipe, the water outlet pressure increases at the contraction section, and the water outlet flow rate accelerates, thereby increasing the water outlet pressure and water outlet flow rate of multiple filter elements and improving the user experience;

[0017] (2) The diameter of the water pipe main body of this connection structure is set to be 3 to 5 times the diameter of the contraction section, so that multiple filter elements generate a greater water outlet pressure and a faster water outlet flow rate at the contraction section of the water outlet pipe. Furthermore, the user experience is improved;

[0018] (3) The connecting pipe of this connection structure includes a water outlet joint and a water inlet joint. It is connected to the cylinder body of the upper-stage filter element through the water outlet joint, so that one end of the connecting pipe is communicated with the water outlet of the upper-stage filter element; it is connected to the cylinder body of the lower-stage filter element through the water inlet joint, so that the other end of the connecting pipe is communicated with the water inlet of the lower-stage filter element. Thus, the water filtered by the upper-stage filter element can either be directly output through the water outlet pipe on the connecting pipe or be transported to the lower-stage filter element through the connecting pipe for further filtration.

[0019] (4) When this connection structure connects two adjacent filter elements through the connecting pipe, the water outlet joint of the connecting pipe is integrally connected to the cylinder body of the upper-stage filter element, and the water inlet joint of the connecting pipe is detachably connected to the cylinder body of the lower-stage filter element. Thus, the lower-stage filter element can be detached from the connecting pipe, which is convenient for maintaining and replacing the lower-stage filter element. Furthermore, it is convenient for replacing and maintaining multiple filter elements, extending the service life of the water purifier.

[0020] (5) A spiral channel is axially provided in the water inlet joint of this connection structure. The spiral channel can buffer the impact of the water flow, thus reducing the impact on the lower-stage filter element caused by the water flow, further protecting the components of the lower-stage filter element, extending the service life of the filter element, and reducing the use cost of the water purifier.

[0021] (6) Through the water hammer elimination device provided on the solenoid valve, this connection structure eliminates the huge instantaneous water pressure generated by the water hammer effect in the water outlet pipe and the connecting pipe, thus protecting the water outlet pipe, the connecting pipe, and the solenoid valve, reducing the damage caused by the water hammer effect to the water outlet pipe, the connecting pipe, and the solenoid valve, further extending the service life of this multi-stage filter element connection structure, and increasing the use cost of the water purifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings incorporated into the specification and constituting a part of the specification illustrate embodiments of the present invention and are used together with the description to explain the principles of the present invention. In these drawings, like reference numerals are used to represent like elements.

[0023] Figure 1 It is a schematic structural diagram of a multi-stage filter element connection structure and a water purifier according to an embodiment of the present invention;

[0024] Figure 2 It is a schematic structural diagram of the connecting pipe and the water outlet pipe of a multi-stage filter element connection structure and a water purifier according to an embodiment of the present invention;

[0025] Figure 3 It is a schematic structural diagram of the water flow of a multi-stage filter element connection structure and a water purifier flowing through the water inlet joint and the filter element according to an embodiment of the present invention;

[0026] Figure 4 The cross-sectional view of a multi-stage filter element connection structure and the water outlet pipe of a water purifier according to an embodiment of the present invention.

[0027] In the figure: 1, filter element; 11, water inlet; 12, water outlet; 13, cylinder; 131, flow-through cavity; 14, filter screen; 141, filter holes; 142, filtration cavity; 2, connecting pipe; 21, water outlet joint; 22, water inlet joint; 221, spiral channel; 3, water outlet pipe; 31, water outlet pipe main body; 32, contraction section; 4, solenoid valve. Specific embodiments

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0029] Please refer to Figures 1 to 4 , a multi-stage filter element connection structure according to an embodiment of the present invention includes a plurality of filter elements 1, a plurality of connecting pipes 2 for connecting two adjacent filter elements 1, and a plurality of water outlet pipes 3 respectively provided on the plurality of connecting pipes 2. The filter element 1 is provided with a water inlet 11 and a water outlet 12. One end of the connecting pipe 2 is communicated with the water outlet 12 of the upper-stage filter element 1, and the other end is communicated with the water inlet 11 of the lower-stage filter element 1. The water outlet pipe 3 is used for discharging the water from the upper-stage filter element 1; the water outlet pipe 3 includes a water outlet pipe main body 31 and a contraction section 32 provided in the middle of the water outlet pipe main body 31. The diameter of the contraction section 32 is smaller than the diameter of the water outlet pipe main body 31.

[0030] The embodiment of the present invention further provides a water purifier including the above multi-stage filter element connection structure.

[0031] In the present application, the multi-stage filter element connection structure includes a plurality of filter elements 1 and a plurality of connecting pipes 2. The connecting pipes 2 connect two adjacent filter elements 1, so that the plurality of filter elements 1 are sequentially communicated through the plurality of connecting pipes 2. When the water to be purified flows through the plurality of filter elements 1, the plurality of filter elements 1 filter the water in sequence, thereby improving the water purification effect of the water purifier.

[0032] Each filter element 1 is provided with a water inlet 11 and a water outlet 12, and a water outlet pipe 3 is provided on each connecting pipe 2. Since one end of the connecting pipe 2 is communicated with the water outlet 12 of the upper-stage filter element 1 and the other end is communicated with the water inlet 11 of the lower-stage filter element 1, the water outlet pipe 3 provided on the connecting pipe 2 can be used for the water outlet of the upper-stage filter element 1. The multiple water outlet pipes 3 respectively provided on the multiple connecting pipes 2 are respectively used for the water outlet of the multiple filter elements 1, so that the separate water outlet of the multiple filter elements 1 can be realized, and the water purifier can meet different water outlet requirements of users.

[0033] In the present application, the water outlet pipe 3 includes a water outlet pipe main body 31 and a contraction section 32. The contraction section 32 is arranged in the middle of the water outlet pipe main body 31, and the diameter of the contraction section 32 is smaller than the diameter of the water outlet pipe main body 31. According to the principle of the Venturi effect: when gas or liquid flows in a Venturi tube, at the narrowest part of the pipe, the dynamic pressure reaches the maximum value and the static pressure reaches the minimum value, and the speed of the gas (liquid) increases because the cross-sectional area of the flow passage decreases. Therefore, in the present application, when the water flowing through the upper-stage filter element 1 flows through the water outlet pipe 3, the water outlet pressure increases at the contraction section 32, and the water outlet flow rate increases, so as to increase the water outlet pressure and water outlet flow rate of the multiple filter elements 1 and improve the user experience.

[0034] Specifically, in this embodiment, the ratio of the diameter of the contraction section 32 to the diameter of the water outlet pipe main body 31 is 1:3 to 5, that is, the diameter of the water outlet pipe main body 31 is 3 to 5 times the diameter of the contraction section 32. According to the principle of the Venturi effect: the magnitude of the increase in the speed of the liquid at the narrow part of the pipe is determined by the change in the cross-sectional area of the flow passage of the pipe. Therefore, in the present application, the diameter of the water outlet pipe main body 31 is set to be 3 to 5 times the diameter of the contraction section 32, so that a greater water outlet pressure and a faster water outlet flow rate are generated at the contraction section 32 of the water outlet pipe 3 for the multiple filter elements 1, thereby improving the user experience.

[0035] In this embodiment, the filter element 1 includes a cylinder 13 provided with a flow-through cavity 131 therein, and a filter screen 14 provided with a plurality of filter holes 141. The filter screen 14 surrounds the flow-through cavity 131 for one week to form a filtering cavity 142. The plurality of filter holes 141 communicate the flow-through cavity 131 with the filtering cavity 142. The water inlet 11 is communicated with the flow-through cavity 131, and the water outlet 12 is communicated with the filtering cavity 142. In the present application, the filter element 1 includes a cylinder 13 and a filter screen 14. The cylinder 13 is provided with a flow-through cavity 131 therein. The filter screen 14 is arranged in the flow-through cavity 131 and surrounds the flow-through cavity 131 for one week, so that a filtering cavity 142 is formed inside the filter screen 14. A plurality of filter holes 141 are provided on the outer periphery of the filter screen 14, and the filter holes 141 communicate the filtering cavity 142 inside the filter screen 14 with the flow-through cavity 131 inside the cylinder 13.

[0036] Since the water inlet 11 of the filter element 1 is in communication with the flow-through cavity 131 and the water outlet 12 is in communication with the filtration cavity 142, when the water outlet 12 of the previous filter element 1 is in communication with the water inlet 11 of the next-stage filter element 1 through the connecting pipe 2, the water filtered by the previous-stage filter element 1 is transported to the flow-through cavity 131 through the water inlet 11 of the next-stage filter element 1. The water entering the flow-through cavity 131 enters the filtration cavity 142 through the filter holes 141 of the filter screen 14. During this process, the filter screen 14 filters the flowing water, and finally, after flowing through the filtration cavity 142, it is output through the water outlet 12, thereby realizing the function of the filter element 1 to filter water.

[0037] Specifically, in the present application, the multiple filter elements 1 may include a primary filter element, a secondary filter element, a tertiary filter element, and a quaternary filter element. A filter screen 14 is provided in the filtration cavity 142 of the primary filter element; in addition to the filter screen 14, a filter membrane is provided in the filtration cavities 142 of the secondary filter element and the tertiary filter element, and the filter membrane is arranged outside the filter screen 14; in addition to the filter screen 14, a reverse osmosis membrane is provided in the filtration cavity 142 of the quaternary filter element, and the reverse osmosis membrane is arranged outside the filter screen 14.

[0038] The water inlet 11 of the primary filter element is in communication with the water supply device, so that the water supply device inputs tap water into the flow-through cavity 131 of the primary filter element, thereby enabling the filter screen 14 of the primary filter element to perform a rough filtration on the tap water and removing various visible substances in the tap water, such as dust and impurities, etc.; the water outlet 12 of the primary filter element is in communication with the water inlet 11 of the secondary filter element through the connecting pipe 2. Therefore, the water filtered by the primary filter element can be output through the water outlet pipe 3 on the connecting pipe 2 for household daily life uses such as washing, or can be transported to the flow-through cavity 131 of the secondary filter element, so that the filter membrane and the filter screen 14 of the secondary filter element filter the water in sequence.

[0039] The water outlet 12 of the secondary filter element is in communication with the water inlet 11 of the tertiary filter element through another connecting pipe 2. Therefore, the water filtered by the secondary filter element can be output through the water outlet pipe 3 on the connecting pipe 2 for household daily life uses such as cooking and washing, or can be transported to the flow-through cavity 131 of the tertiary filter element, so that the filter membrane and the filter screen 14 of the tertiary filter element filter the water in sequence, thereby enabling the secondary filter element and the tertiary filter element to perform ultrafiltration on the water, removing chlorine and organic impurities in the water, and absorbing the odors, colors, and smells generated by organic compounds in the water.

[0040] The water outlet 12 of the three - stage filter element is connected to the water inlet 11 of the four - stage filter element through the third connecting pipe 2. Therefore, the water filtered by the three - stage filter element can be output through the water outlet pipe 3 on the connecting pipe 2 for household daily uses such as cooking and washing, or can be transported to the flow - through cavity 131 of the four - stage filter element, so that the reverse osmosis membrane and the filter screen 14 of the three - stage filter element filter the water in sequence, enabling the four - stage filter element to perform reverse osmosis filtration on the water, further removing trace bacteria, viruses and heavy metals in the water, and adjusting the pH value of the water. The water filtered by the four - stage filter element can be directly output for direct drinking, thus improving the purification effect of the water purifier on water and ensuring the physical health of users.

[0041] In this embodiment, the connecting pipe 2 includes a water outlet joint 21 connected to the cylinder body 13 of the upper - stage filter element 1 and a water inlet joint 22 connected to the cylinder body 13 of the lower - stage filter element 1. The water outlet joint 21 is used to connect one end of the connecting pipe 2 to the water outlet 12 of the upper - stage filter element 1, and the water inlet joint 22 is used to connect the other end of the connecting pipe 2 to the water inlet 11 of the lower - stage filter element 1.

[0042] In this application, the connecting pipe 2 includes a water outlet joint 21 and a water inlet joint 22. By connecting the water outlet joint 21 to the cylinder body 13 of the upper - stage filter element 1, one end of the connecting pipe 2 is connected to the water outlet 12 of the upper - stage filter element 1; by connecting the water inlet joint 22 to the cylinder body 13 of the lower - stage filter element 1, the other end of the connecting pipe 2 is connected to the water inlet 11 of the lower - stage filter element 1. Thus, the water filtered by the upper - stage filter element 1 can either be directly output through the water outlet pipe 3 on the connecting pipe 2 or be transported through the connecting pipe 2 to the lower - stage filter element 1 for further filtration.

[0043] In this embodiment, the water outlet joint 21 is integrally connected to the cylinder body 13 of the upper - stage filter element 1, and the water inlet joint 22 is detachably connected to the cylinder body 13 of the lower - stage filter element 1. In this application, when connecting two adjacent filter elements 1 through the connecting pipe 2, the water outlet joint 21 of the connecting pipe 2 is integrally connected to the cylinder body 13 of the upper - stage filter element 1, and the water inlet joint 22 of the connecting pipe 2 is detachably connected to the cylinder body 13 of the lower - stage filter element 1, so that the lower - stage filter element 1 can be detached from the connecting pipe 2, facilitating the maintenance and replacement of the lower - stage filter element 1, and further facilitating the replacement and maintenance of multiple filter elements 1, and prolonging the service life of the water purifier.

[0044] Specifically, the water outlet joint 21 of the connecting pipe 2 can be integrally connected to the cylinder body 13 of the upper - stage filter element 1 by welding; the water inlet joint 22 of the connecting pipe 2 can be detachably connected to the cylinder body 13 of the lower - stage filter element 1 by screwing, clamping or other means.

[0045] In this embodiment, a spiral channel 221 is axially provided in the water inlet connector 22. When the water inlet connector 22 is connected to the cylinder 13 of the next-stage filter element 1, the spiral channel 221 communicates the connecting pipe 2 with the water inlet 11 of the next-stage filter element 1. Since in this application, the connection between the water inlet connector 22 and the cylinder 13 of the next-stage filter element 1 is used to realize the communication between the other end of the connecting pipe 2 and the water inlet 11 of the next-stage filter element 1. Therefore, in this application, a spiral channel 221 is axially provided in the water inlet connector 22. When the water inlet connector 22 is connected to the cylinder 13 of the first-stage filter element 1, the other end of the connecting pipe 2 is communicated with the water inlet 11 of the next-stage filter element 1 through the spiral channel 221, so that water can flow through the connecting pipe 2 to the next-stage filter element 1.

[0046] The reason for setting the water flow channel in the water inlet connector 22 as the spiral channel 221 is that when the previous-stage filter element 1 conveys water to the next-stage filter element 1 through the connecting pipe 2, the water flow first passes through the spiral channel 221 and then enters the flow-through cavity 131 of the next-stage filter element 1 through the water inlet 11. During this process, the spiral channel 221 can buffer the impact of the water flow, thereby reducing the impact on the next-stage filter element 1, further protecting the components of the next-stage filter element 1, prolonging the service life of the filter element 1, and reducing the use cost of the water purifier.

[0047] Since the spiral channel 221 is axially arranged along the water inlet connector 22, specifically, in this embodiment, the spiral angle of the spiral channel 221 along the axis of the water inlet connector 22 can be set to 5° - 50°, so that the spiral channel 221 can better buffer the impact of the water flow, reduce the impact on the next-stage filter element 1, further protect the components of the next-stage filter element 1, prolong the service life of the filter element 1, and reduce the use cost of the water purifier.

[0048] In this embodiment, a solenoid valve 4 is provided on the contraction section 32, and the solenoid valve 4 can be used to control the opening or closing of the water outlet pipe 3. Since in this application, adjacent two filter elements 1 are communicated through the connecting pipe 2, it is necessary to enable the water filtered by the previous-stage filter element 1 to be conveyed to the next-stage filter element 1 through the connecting pipe 2 for further filtration, and also to enable the water filtered by the previous-stage filter element 1 to be output through the water outlet pipe 3 on the connecting pipe 2, so as to realize the individual water output of multiple filter elements 1 and meet the different water output requirements of users.

[0049] Therefore, in the present application, a solenoid valve 4 is provided on the contraction section 32 of the water outlet pipe 3. When the solenoid valve 4 opens the contraction section 32 of the water outlet pipe 3, the water outlet pipe 3 is opened, enabling the water filtered by the upper-stage filter element 1 to be output through the water outlet pipe 3 on the connecting pipe 2, realizing the individual water output of multiple filter elements 1. When the solenoid valve 4 closes the contraction section 32 of the water outlet pipe 3, the water outlet pipe 3 is closed, enabling the water filtered by the upper-stage filter element 1 to be conveyed to the lower-stage filter element 1 through the connecting pipe 2 for further filtration.

[0050] Furthermore, in this embodiment, since a water hammer effect will be generated in the water outlet pipe 3 and the connecting pipe 2 at the moment when the solenoid valve 4 closes, thus impacting the water outlet pipe 3 and the connecting pipe 2, affecting the service life of the pipeline, and further affecting the service life of this multi-stage filter element connection structure, increasing the usage cost of the water purifier.

[0051] Therefore, in the present application, a water hammer elimination device is provided on the solenoid valve 4. When the solenoid valve 4 closes and the water flow in the water outlet pipe 3 is suddenly cut off, the water hammer elimination device provided on the solenoid valve 4 eliminates the huge instantaneous water pressure generated by the water flow in the water outlet pipe 3 and the connecting pipe 2 due to the water hammer effect, thereby protecting the water outlet pipe 3, the connecting pipe 2, and the solenoid valve 4, reducing the damage caused by the water hammer effect to the water outlet pipe 3, the connecting pipe 2, and the solenoid valve 4, and further extending the service life of this multi-stage filter element connection structure and increasing the usage cost of the water purifier. Specifically, for the structure of the solenoid valve 4 and the water hammer elimination device, reference can be made to the Chinese utility model patent with the publication number CN201116607Y and the patent name of an ultra-thin piston with a guide rod solenoid valve 4.

[0052] The content described above can be implemented alone or in various combinations, and these variant ways are all within the protection scope of the present utility model.

[0053] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0054] 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 foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A multi-stage filter element connection structure, characterized in that: The invention comprises a plurality of filter elements (1), a plurality of connecting pipes (2) for connecting two adjacent filter elements (1), and a plurality of water outlet pipes (3) respectively arranged on the plurality of connecting pipes (2); the filter element (1) is provided with a water inlet (11) and a water outlet (12); one end of the connecting pipe (2) is connected to the water outlet (12) of the previous filter element (1), and the other end is connected to the water inlet (11) of the next filter element (1); the water outlet pipe (3) is used to discharge water from the previous filter element (1); the water outlet pipe (3) comprises a water outlet pipe body (31), and a contraction section (32) arranged in the middle of the water outlet pipe body (31); the diameter of the contraction section (32) is smaller than the diameter of the water outlet pipe body (31).

2. A multi-stage filter element connection structure as claimed in claim 1, characterized in that: The ratio of the diameter of the contraction section (32) to the diameter of the water outlet pipe body (31) is 1:3-5.

3. A multi-stage filter element connection structure as claimed in claim 1, characterized in that: The filter element (1) comprises a cylindrical body (13) having a flow chamber (131) therein, and a filter screen (14) having a plurality of filter holes (141); the filter screen (14) surrounds the flow chamber (131) to form a filter chamber (142); the plurality of filter holes (141) connect the flow chamber (131) with the filter chamber (142); the water inlet (11) connects with the flow chamber (131); and the water outlet (12) connects with the filter chamber (142).

4. A multi-stage filter element connection structure as claimed in claim 3, characterized in that: The connecting pipe (2) comprises a water outlet joint (21) connected to the barrel (13) of the previous filter element (1), and a water inlet joint (22) connected to the barrel (13) of the next filter element (1); the water outlet joint (21) is used to connect one end of the connecting pipe (2) to the water outlet (12) of the previous filter element (1), and the water inlet joint (22) is used to connect the other end of the connecting pipe (2) to the water inlet (11) of the next filter element (1).

5. A multi-stage filter element connection structure as claimed in claim 4, characterized in that: The water outlet joint (21) is integrally connected to the barrel (13) of the previous filter element (1), and the water inlet joint (22) is detachably connected to the barrel (13) of the next filter element (1).

6. A multi-stage filter element connection structure as claimed in claim 4, characterized in that: A spiral channel (221) is provided in the water inlet joint (22) along the axial direction. When the water inlet joint (22) is connected to the cylinder (13) of the next filter element (1), the spiral channel (221) connects the connecting pipe (2) with the water inlet (11) of the next filter element (1).

7. A multi-stage filter element connection structure as claimed in claim 6, characterized in that: The spiral angle of the spiral channel (221) is 5°-50°.

8. A multi-stage filter element connection structure as claimed in claim 1, characterized in that: The contraction section (32) is provided with a solenoid valve (4), and the solenoid valve (4) is used to control the opening or closing of the water outlet pipe (3).

9. A multi-stage filter element connection structure as claimed in claim 8, characterized in that: The solenoid valve (4) is provided with a water hammer elimination device, and the water hammer elimination device is used to eliminate the water hammer effect in the pipeline.

10. A water purifier, characterized in that: It comprises a multi-stage filter element connection structure as described in any one of claims 1-9.

Images