Filter element and water purifier

Abstract

The filter element comprises a shell, a central pipe, a filter membrane, an elastic diaphragm and an on-off valve, a water purification cavity and a channel are arranged in the shell, the central pipe is mounted in the water purification cavity, a plurality of water passing holes are formed in the peripheral surface of the central pipe, an inner cavity of the central pipe is communicated with the water purification cavity through the water passing holes, and the elastic diaphragm is arranged in the water purification cavity. The filter membrane is installed in the water purification cavity and wraps the center pipe, the elastic diaphragm is installed in the shell, the elastic diaphragm and the shell define a water storage cavity, the water storage cavity is communicated with an inner cavity of the center pipe through a channel, and the opening and closing valve is installed in the channel and used for opening and closing the channel. Purified water in the water storage cavity is injected into the central pipe from the channel under the driving of the elastic diaphragm, and the purified water replaces concentrated water in the filter membrane, so that no high-concentration water exists in the filter membrane, no crystal salt is generated, and even if concentrated water residues exist on the surface of the filter membrane, the concentrated water is very little, diluted by the purified water and cannot crystallize, and therefore, the membrane surface cannot be crystallized, polluted and blocked, and the service life of the membrane is prolonged. The service life of the filtering membrane is prolonged.

Description

Technical Field

[0001] This utility model relates to a filter element and a water purifier. Background Technology

[0002] Reverse osmosis membranes and nanofiltration membranes are commonly used filtration elements in water purifiers. After filtration, the water pump stops running, leaving concentrated water outside the reverse osmosis or nanofiltration membrane. The TDS (Total Dissolved Solids) value of this concentrated water is often very high, increasing as it approaches the membrane surface. Over time, this accumulation can easily lead to crystallization on the membrane surface, forming crystalline salts such as calcium carbonate, magnesium carbonate, and sodium chloride. These salts clog the membrane surface, reducing membrane flux and lifespan. Especially after filtration, if the filter element is not used for an extended period, concentrated water can permeate into the membrane, causing the TDS of the purified water inside the membrane to rise, resulting in impure effluent. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a filter element and a water purifier.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A filter element includes a housing, a central tube, a filter membrane, an elastic diaphragm, and an on / off valve. The housing has a purified water chamber and a channel inside. The central tube is installed in the purified water chamber and has several water passage holes on its outer circumferential surface. The inner cavity of the central tube communicates with the purified water chamber through the water passage holes. The filter membrane is installed in the purified water chamber and wraps around the outside of the central tube. The elastic diaphragm is installed in the housing and forms a water storage chamber with the housing. The water storage chamber communicates with the inner cavity of the central tube through the channel. The on / off valve is installed in the channel and is used to open and close the channel.

[0006] In this design, the filter cartridge has a water storage chamber formed by an elastic diaphragm and the housing. During water production, the pressure in the purified water chamber is relatively high. Opening the on / off valve allows the filtered purified water to be stored in the storage chamber through the central pipe and channels. Once the storage chamber is full, the on / off valve can be closed. After the filter cartridge finishes producing water, the water in the purified water chamber will slowly flow out through the wastewater outlet of the filter cartridge, and the water pressure in the purified water chamber will gradually decrease. At this time, the on / off valve can be opened, and the purified water in the storage chamber, driven by the elastic diaphragm, will flow into the central pipe through the channels. The purified water replaces the concentrated water in the filter membrane, achieving the purpose of replacing the concentrated water. The next time the filter cartridge is used to produce water, the first cup of water will not have a high TDS problem. After the concentrated water is replaced, there is no high concentration of water in the filter membrane, and no crystallizing salt will be produced. Even if there is concentrated water residue on the surface of the filter membrane, it is very little and is diluted by the purified water, so it will not crystallize, thus preventing crystallization and clogging on the membrane surface and improving the life of the filter membrane.

[0007] The elastic diaphragm has elasticity, which can maintain a certain water pressure in the water storage chamber. After the valve is opened, the purified water can be injected into the central tube, so there is no need for other drive mechanisms to provide power, thus simplifying the structure of the filter element and saving operation steps.

[0008] In one alternative, the on / off valve is selected as a manually operable switch valve, which allows the operator to open or close the channel according to different stages to replace the concentrated water in the filter element.

[0009] In another alternative, the on / off valve is selected as a solenoid valve, which is electrically connected to the control board. The control board controls the opening or closing of the on / off valve according to the different working stages of the filter element.

[0010] In another alternative, the on / off valve is selected as a valve that can automatically open based on the pressure changes in the clean water chamber and the storage chamber, using the pressure difference between the clean water chamber and the storage chamber to achieve automatic opening or closing of the on / off valve.

[0011] Preferably, the channel includes an inlet channel and an outlet channel. One end of the inlet channel is connected to the inner cavity of the central tube, and the other end of the inlet channel is connected to the water storage chamber. The area between the outer side of the filter membrane and the shell is the raw water area. One end of the outlet channel is connected to the raw water area, and the other end of the outlet channel is connected to the water storage chamber. The on / off valve includes a gravity-sensing automatic switch and a pressure-sensing automatic switch. The gravity-sensing automatic switch is installed in the inlet channel and is used to open the inlet channel when the pressure difference between the purified water chamber and the water storage chamber exceeds a first preset pressure. The pressure-sensing automatic switch is installed in the outlet channel and is used to open the outlet channel when the pressure difference between the water storage chamber and the purified water chamber exceeds a second preset pressure.

[0012] In this design, the gravity-sensing automatic switch remains normally closed, opening the inlet channel only when the pressure difference between the purified water chamber and the storage chamber exceeds a first preset pressure, allowing purified water to flow into the storage chamber. The pressure-sensing automatic switch also remains normally closed, opening the outlet channel only when the pressure difference between the storage chamber and the purified water chamber exceeds a second preset pressure, allowing purified water from the storage chamber to flow into the area between the outer side of the filter membrane and the housing (the raw water area), thus replacing the concentrated water.

[0013] During the water purification stage, the purified water chamber maintains a high water pressure, while the storage chamber is empty and has a low pressure. The water pressure in the purified water chamber is transmitted to the gravity-sensing automatic switch through the water inlet channel. When the pressure exceeds the first preset pressure, the gravity-sensing automatic switch is turned on, and purified water is injected into the storage chamber. The elastic diaphragm expands, and as the amount of water increases, the water pressure in the storage chamber increases. When the pressure difference between the purified water chamber and the storage chamber is less than the first preset pressure, the gravity-sensing automatic switch closes the water inlet channel. At this time, the storage chamber is filled with purified water.

[0014] After water purification is completed, the water in the purification chamber will slowly flow out through the wastewater outlet of the filter element. The water pressure in the purification chamber will gradually decrease. When the pressure difference between the purification chamber and the storage chamber exceeds the first preset pressure, the pressure sensing automatic switch opens the water outlet channel. The elastic diaphragm contracts under the action of elasticity, injecting the water in the storage chamber into the area between the outer side of the filter membrane and the shell (raw water area), thereby achieving the purpose of replacing the concentrated water with purified water.

[0015] The first preset pressure and the second preset pressure can be set according to the user's needs.

[0016] Preferably, the water inlet channel is provided with a receiving cavity, the bottom of the receiving cavity is provided with a sealing port, the gravity sensing switch includes a gravity ball, the gravity ball is installed in the receiving cavity and can float in the receiving cavity to open or close the sealing port, and a limiting structure is provided above the receiving cavity to prevent the gravity ball from sliding out of the receiving cavity.

[0017] In this design, the gravity ball uses its own weight to press down and close the seal, thus shutting off the water inlet channel and ensuring unidirectional flow from the purified water chamber to the storage chamber. When the pressure of the upward-flowing water exceeds the pressure of its own weight, the gravity ball floats upward, opening the seal and allowing the water inlet channel to open. A limiting structure keeps the gravity ball floating within the designated receiving cavity, preventing it from detaching.

[0018] Preferably, an elastic component is provided between the gravity ball and the shell, with its two ends connected to the gravity ball and the shell respectively, so that the magnitude of the first preset pressure can be adjusted by using the elastic force of different elastic components.

[0019] Preferably, a receiving cavity is provided in the water outlet channel, and a flow hole is provided at one end of the receiving cavity facing the water storage cavity. The pressure-sensing automatic switch includes a sealing ball and an elastic element. The sealing ball is installed in the receiving cavity and can float in the receiving cavity to open or close the flow hole. The two ends of the elastic element are respectively connected to the sealing ball and the housing, so that the sealing ball closes the flow hole from the purified water cavity toward the water storage cavity.

[0020] In this design, the sealing ball, relying on the elastic force of the elastic element, seals the flow hole from the purified water chamber towards the storage chamber, thus closing the water outlet channel and ensuring unidirectional flow from the storage chamber to the purified water chamber. When the sealing ball is subjected to water pressure from the storage chamber to the purified water chamber exceeding a second preset pressure, the sealing ball will float, move away, and open the flow hole, thus opening the water outlet channel. The second preset pressure can be set based on the weight of the sealing ball, the elastic force of the elastic element, and the installation posture.

[0021] Preferably, there are two water outlet channels, which are respectively located on both sides of the central pipe in the radial direction.

[0022] In this solution, the above-mentioned structural design facilitates the uniform entry of purified water into the raw water zone, prevents dead zones, and achieves the effect of fully replacing the concentrated water.

[0023] Preferably, the central tube is arranged vertically, the outlet of the water outlet channel is located at the upper end of the filter membrane, and the wastewater outlet of the filter element is located at the lower end of the filter membrane.

[0024] In this solution, the above-mentioned structure is adopted, so that the winding body of the filter membrane is also vertically arranged, the outlet of the water outlet channel is located at the upper end of the filter membrane, and the wastewater outlet of the filter element is located at the lower end of the filter membrane, so that the purified water washes the surface of the filter membrane from top to bottom, which facilitates the washing away of impurities and crystallized salts on the surface of the filter membrane, and then discharges from the wastewater outlet of the filter element.

[0025] Preferably, the elastic diaphragm and the shell also form an air storage cavity, the air storage cavity and the water storage cavity are respectively located on both sides of the elastic diaphragm, and the shell is also provided with a sealed air inlet for inflating the air storage cavity.

[0026] In this design, the inflatable air storage chamber is used to adjust the elasticity of the diaphragm. The more air is filled into the chamber, the greater the pressure on the diaphragm. When the chamber is filled with gas, the diaphragm is subjected to the air pressure during both expansion and contraction. When the diaphragm expands and increases the volume of the water storage chamber, it compresses the air inside, increasing the air pressure. When the channel is opened to drain water from the water storage chamber, the air pressure compresses the diaphragm, causing it to contract and increasing the driving force, thus reducing the volume of the water storage chamber and draining the water.

[0027] Preferably, the housing includes a cylindrical body and a water displacement device. The water displacement device is installed at the upper end of the cylindrical body and is snapped into the cover of the cylindrical body. The purified water chamber is disposed inside the cylindrical body, and the water storage chamber is disposed inside the water displacement device. The interface of the cylindrical body and the interface of the water displacement device are correspondingly disposed to form the channel.

[0028] In this design, the water displacement device is snapped into the cylindrical body, facilitating the separate processing of the filter cartridge's cylindrical body and the water displacement device, especially simplifying the processing of the interfaces within the cylindrical body and the water displacement device. Simultaneously, the snap-fit ​​connection between the water displacement device and the cylindrical body facilitates the installation and maintenance of the on / off valves and elastic diaphragms within the channel.

[0029] Preferably, the central tube is arranged vertically, and the upper opening of the central tube is connected to the lower end of the channel.

[0030] In this solution, the above-mentioned structural design is adopted to reduce pressure loss and facilitate the opening and closing of the valve by water pressure in the central pipe.

[0031] A water purifier comprising a filter element as described above.

[0032] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0033] The significant advantages of this invention are as follows: The filter cartridge has a water storage chamber formed by an elastic diaphragm and the housing. During water production, the pressure in the purified water chamber is relatively high. Opening the on / off valve allows the filtered purified water to be stored in the storage chamber through the central tube and channel. Once the storage chamber is full, the on / off valve can be closed. After the filter cartridge finishes producing water, the water in the purified water chamber slowly flows out through the wastewater outlet, gradually reducing the water pressure. At this point, the on / off valve can be opened, and the purified water in the storage chamber, driven by the elastic diaphragm, flows into the central tube through the channel. This purified water replaces the concentrated water in the filter membrane, achieving the purpose of replacing the concentrated water. The next time the filter cartridge is used to produce water, the first cup of water will not have a high TDS problem. After the concentrated water is replaced, there is no high-concentration water in the filter membrane, preventing the formation of crystallized salts. Even if there is concentrated water residue on the filter membrane surface, it is very little and is diluted by the purified water, preventing crystallization and clogging, thus extending the lifespan of the filter membrane. The elastic diaphragm has elasticity, which can maintain a certain water pressure in the water storage chamber. After the valve is opened, the purified water can be injected into the central tube, so there is no need for other drive mechanisms to provide power, thus simplifying the structure of the filter element and saving operation steps. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the filter element structure of a preferred embodiment of the present invention. Figure 1 .

[0035] Figure 2 This is a schematic diagram of the filter element structure of a preferred embodiment of the present invention. Figure 2 .

[0036] Figure 3 for Figure 2Cross-sectional view along line AA.

[0037] Figure 4 for Figure 3 Enlarged view of section B.

[0038] Explanation of reference numerals in the attached figures:

[0039] Casing 1

[0040] Water purification chamber 11

[0041] Channel 12

[0042] Water inlet channel 121

[0043] Receptacle 1211

[0044] Sealing port 1212

[0045] Limiting structure 1213

[0046] Water outlet channel 122

[0047] 1221 accommodating cavity

[0048] Flow hole 1222

[0049] Water storage chamber 13

[0050] Raw water area 14

[0051] Gas storage chamber 15

[0052] Inflation port 151

[0053] Cylindrical body 101

[0054] Water quality replacement device 102

[0055] Central tube 2

[0056] Water passage hole 21

[0057] Filter membrane 3

[0058] Elastic diaphragm 4

[0059] On / off valve 5

[0060] Gravity sensor automatic switch 51

[0061] Gravity Ball 511

[0062] Pressure-sensitive automatic switch 52

[0063] Sealing ball 521

[0064] Elastic element 522

[0065] Raw water outlet 100

[0066] 200 water purification outlet

[0067] Wastewater outlet 300 Detailed Implementation

[0068] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0069] like Figures 1-4 As shown, this embodiment discloses a filter element, which includes a housing 1, a central tube 2, a filter membrane 3, an elastic diaphragm 4, and an on / off valve 5. The housing 1 has a water purification chamber 11 and a channel 12 inside. The central tube 2 is installed in the water purification chamber 11, and a plurality of water passage holes 21 are provided on the outer peripheral surface of the central tube 2. The inner cavity of the central tube 2 is connected to the water purification chamber 11 through the water passage holes 21. The filter membrane 3 is installed in the water purification chamber 11 and wraps around the outside of the central tube 2. The elastic diaphragm 4 is installed in the housing 1 and forms a water storage chamber 13 with the housing 1. The water storage chamber 13 is connected to the inner cavity of the central tube 2 through the channel 12. The on / off valve 5 is installed in the channel 12 and is used to open and close the channel 12.

[0070] like Figures 1-4 As shown, in this embodiment, the filter cartridge has a water storage chamber 13 formed by the elastic diaphragm 4 and the housing 1 inside the housing 1. When making water, the pressure in the purified water chamber 11 is relatively high. When the on / off valve 5 is opened, the filtered purified water is stored in the water storage chamber 13 through the central pipe 2 and the channel 12. After the water storage chamber 13 is full, the on / off valve 5 can be closed. After the filter cartridge finishes making water, the water in the purified water chamber 11 will slowly flow out through the wastewater outlet of the filter cartridge, and the water pressure in the purified water chamber 11 will gradually decrease. At this time, the on / off valve 5 can be opened, and the purified water in the water storage chamber 13 is injected into the central pipe 2 through the channel 12 under the drive of the elastic diaphragm 4. The purified water replaces the concentrated water in the filter membrane 3, achieving the purpose of replacing the concentrated water. When the filter cartridge is used to make water again, the first cup of water will not have a high TDS problem. After the concentrated water is replaced, there is no high concentration of water in the filter membrane 3, and no crystallized salt will be formed. Even if there is concentrated water residue on the surface of the filter membrane 3, it is very little and is diluted by the purified water, so it will not crystallize. This prevents the membrane surface from clogging and extends the life of the filter membrane 3. The elastic diaphragm 4 has elasticity, which can maintain a certain water pressure in the water storage chamber 13. After opening the on / off valve 5, the purified water can be injected into the central pipe 2, eliminating the need for other drive mechanisms to provide power. This simplifies the structure of the filter element and saves operating steps.

[0071] In an optional embodiment, the on / off valve is selected as a manually operable switch valve, which allows the operator to open or close the channel according to different stages to achieve the purpose of replacing the concentrated water in the filter element.

[0072] In another optional embodiment, the on / off valve is selected as a solenoid valve, which is electrically connected to the control board. The control board controls the opening or closing of the on / off valve according to the different working stages of the filter element.

[0073] In another optional embodiment, the on / off valve is selected as a valve that can automatically open according to the pressure changes of the clean water chamber and the water storage chamber, and the on / off valve is automatically opened or closed by utilizing the pressure difference between the clean water chamber and the water storage chamber.

[0074] like Figure 3 and Figure 4 As shown, in this embodiment, the channel 12 includes an inlet channel 121 and an outlet channel 122. One end of the inlet channel 121 is connected to the inner cavity of the central tube 2, and the other end of the inlet channel 121 is connected to the water storage chamber 13. The area between the outer side of the filter membrane 3 and the shell 1 is the raw water area 14. One end of the outlet channel 122 is connected to the raw water area 14, and the other end of the outlet channel 122 is connected to the water storage chamber 13. The on / off valve 5 includes a gravity-sensing automatic switch 51 and a pressure-sensing automatic switch 52. The gravity-sensing automatic switch 51 is installed in the inlet channel 121 and is used to open the inlet channel 121 when the pressure difference between the purified water chamber 11 and the water storage chamber 13 exceeds a first preset pressure. The pressure-sensing automatic switch 52 is installed in the outlet channel 122 and is used to open the outlet channel 122 when the pressure difference between the water storage chamber 13 and the purified water chamber 11 exceeds a second preset pressure.

[0075] like Figure 3 and Figure 4As shown, the gravity-sensing automatic switch 51 remains normally closed. It only opens the water inlet channel 121 when the pressure difference between the purified water chamber 11 and the water storage chamber 13 exceeds the first preset pressure, allowing purified water to flow into the water storage chamber 13 through the water inlet channel 121. The pressure-sensing automatic switch 52 also remains normally closed. It only opens the water outlet channel 122 when the pressure difference between the water storage chamber 13 and the purified water chamber 11 exceeds the second preset pressure, allowing purified water from the water storage chamber 13 to flow into the area between the outer side of the filter membrane 3 and the housing 1 (raw water area 14), thus replacing the concentrated water. During the water purification stage, the purified water chamber 11 maintains a high water pressure, while the water storage chamber 13 is empty and has a low pressure. The water pressure in the purified water chamber 11 is transmitted to the gravity-sensing automatic switch 51 through the water inlet channel 121. When the pressure exceeds the first preset pressure, the gravity-sensing automatic switch 51 is turned on, and purified water is injected into the water storage chamber 13. The elastic diaphragm 4 expands, and as the amount of water increases, the water pressure in the water storage chamber 13 increases. When the pressure difference between the purified water chamber 11 and the water storage chamber 13 is less than the first preset pressure, the gravity-sensing automatic switch 51 closes the water inlet channel 121, and the water storage chamber 13 is filled with purified water. After water purification is completed, the water in the purification chamber 11 will slowly flow out through the wastewater outlet of the filter element, and the water pressure in the purification chamber 11 will gradually decrease. When the pressure difference between the purification chamber 11 and the storage chamber 13 exceeds the first preset pressure, the pressure-sensing automatic switch 52 opens the water outlet channel 122, and the elastic diaphragm 4 contracts under the action of elasticity, injecting the water in the storage chamber 13 into the area between the outer side of the filter membrane 3 and the housing 1 (raw water area 14), thereby achieving the purpose of replacing the concentrated water with purified water. The first preset pressure and the second preset pressure can be set according to the user's needs.

[0076] like Figure 3 and Figure 4As shown, a receiving cavity 1211 is provided inside the water inlet channel 121. A sealing port 1212 is provided at the bottom of the receiving cavity 1211. The gravity sensor switch includes a gravity ball 511, which is installed in the receiving cavity 1211 and can float within the receiving cavity 1211 to open or close the sealing port 1212. A limiting structure 1213 is provided above the receiving cavity 1211 to prevent the gravity ball 511 from sliding out of the receiving cavity 1211. The gravity ball 511 relies on its own weight to press down and close the sealing port 1212, thereby closing the water inlet channel 121 and enabling unidirectional flow of the water inlet channel 121 from the purified water chamber 11 to the water storage chamber 13. When the pressure of the upward water exceeds the pressure of its own weight, the gravity ball 511 floats upward, opening the sealing port 1212 and opening the water inlet channel 121. The limiting structure 1213 allows the gravity ball 511 to float within the designated receiving cavity 1211, preventing it from detaching. In this embodiment, the limiting structure 1213 is a hollow structure, facilitating water passage through the water inlet channel 121. The size of the receiving cavity 1211 is slightly larger than the outer diameter of the gravity ball 511, allowing purified water to pass through the gap between the gravity ball 511 and the receiving cavity 1211 when the gravity ball 511 floats upward. In this embodiment, the first preset pressure is equal to the weight of the gravity ball 511.

[0077] Preferably, an elastic component is provided between the gravity ball 511 and the shell 1, with both ends of the elastic component connected to the gravity ball 511 and the shell 1 respectively, so that the magnitude of the first preset pressure can be adjusted by using the elastic force of different elastic components.

[0078] like Figure 3 and Figure 4 As shown, a receiving cavity 1221 is provided inside the water outlet channel 122. A flow hole 1222 is provided at one end of the receiving cavity 1221 facing the water storage cavity 13. The pressure-sensing automatic switch 52 includes a sealing ball 521 and an elastic element 522. The sealing ball 521 is installed in the receiving cavity 1221 and can float within the receiving cavity 1221 to open or close the flow hole 1222. The two ends of the elastic element 522 are respectively connected to the sealing ball 521 and the housing 1, so that the sealing ball 521 closes the flow hole 1222 from the clean water cavity 11 towards the water storage cavity 13. The sealing ball 521 closes the flow hole 1222 from the clean water cavity 11 towards the water storage cavity 13 by relying on the elastic force of the elastic element 522, thereby achieving the purpose of closing the water outlet channel 122 and realizing unidirectional flow of the water outlet channel 122 from the water storage cavity 13 to the clean water cavity 11. When the water pressure from the water storage chamber 13 to the clean water chamber 11 exceeds the second preset pressure, the sealing ball 521 will float, move away, and open the flow hole 1222, thereby opening the water outlet channel 122. The second preset pressure can be set comprehensively based on the weight of the sealing ball 521, the elastic force of the elastic element 522, and the installation posture.

[0079] In this embodiment, the size of the accommodating cavity 1221 is slightly larger than the outer diameter of the sealing ball 521, so that when the sealing ball 521 floats downward, the purified water can pass through the gap between the sealing ball 521 and the accommodating cavity 1221.

[0080] like Figure 3 and Figure 4 As shown, there are two water outlet channels 122. The two water outlet channels 122 are respectively set on both sides of the radial direction of the central pipe 2, so that the purified water can enter the raw water area 14 evenly, prevent dead corners, and achieve the effect of fully replacing the concentrated water.

[0081] like Figure 3 As shown, the central tube 2 is vertically arranged, which also makes the winding body of the filter membrane 3 vertically arranged. The outlet of the water outlet channel 122 is located at the upper end of the filter membrane 3, and the wastewater outlet of the filter element is located at the lower end of the filter membrane 3, which improves the rinsing effect and allows purified water to rinse the surface of the filter membrane 3 from top to bottom, making it easier to wash away impurities and crystallized salts on the surface of the filter membrane 3, and then discharge it from the wastewater outlet of the filter element.

[0082] like Figure 3 As shown, the upper opening of the central pipe 2 is connected to the lower end of the channel 12, which reduces pressure loss and facilitates the use of water pressure in the central pipe 2 to open the on / off valve 5.

[0083] like Figure 3 and Figure 4 As shown, the elastic diaphragm 4 and the shell 1 also form an air storage chamber 15. The air storage chamber 15 and the water storage chamber 13 are located on opposite sides of the elastic diaphragm 4. The shell 1 is also provided with a sealed air inlet 151, which is used to inflate the air storage chamber 15. The inflated air storage chamber 15 is used to adjust the elasticity of the elastic diaphragm 4. The more air is inflated in the air storage chamber 15, the greater the pressure on the elastic diaphragm 4. When the air storage chamber 15 is filled with gas, the elastic diaphragm 4 can be subjected to the air pressure in the air storage chamber 15 during both the expansion and contraction phases. When the elastic diaphragm 4 expands and increases the volume of the water storage chamber 13, the elastic diaphragm 4 will compress the air in the air storage chamber 15, increasing the air pressure. When the channel 12 is opened to drain the water in the water storage chamber 13, the air pressure in the air storage chamber 15 will compress the elastic diaphragm 4, causing the elastic diaphragm 4 to contract, increasing the driving force, reducing the volume of the water storage chamber 13, and draining the water from the water storage chamber 13.

[0084] Preferably, a switch valve is installed at the inflation port 151 to open and close the inflation port 151, facilitating inflation of the air storage chamber 15. In an optional embodiment, a resilient plug is installed at the inflation port 151 to seal the inflation port.

[0085] like Figures 1-4As shown, the housing 1 includes a cylindrical body 101 and a water exchanger 102. The water exchanger 102 is installed at the upper end of the cylindrical body 101 and is snap-fitted to the upper end cover of the cylindrical body 101. A purified water chamber 11 is disposed inside the cylindrical body 101, and a water storage chamber 13 is disposed inside the water exchanger 102. The interfaces of the cylindrical body 101 and the water exchanger 102 are correspondingly arranged to form a channel 12. The snap-fit ​​connection between the water exchanger 102 and the cylindrical body 101 facilitates the separate processing of the cylindrical body 101 and the water exchanger 102 of the filter element, especially facilitating the processing of the interfaces and channels inside the cylindrical body 101 and the water exchanger 102. At the same time, the snap-fit ​​connection between the water exchanger 102 and the cylindrical body 101 facilitates the installation and maintenance of the on / off valve 5 and the elastic diaphragm 4 within the channel 12.

[0086] like Figure 1 As shown, the housing 1 is also provided with a raw water inlet 100, a clean water inlet 200 and a waste water inlet 300. The raw water inlet 100 is connected to one end of the clean water chamber 11, the clean water inlet 200 is connected to the inner cavity of the central tube 2, and the waste water inlet 300 is connected to the other end of the clean water chamber 11.

[0087] This embodiment also discloses a water purifier, which includes the filter element described above.

[0088] In the description herein, it should be understood that the terms "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0089] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A filter cartridge, characterized by, The filter element comprises a shell, a center tube, a filter membrane, an elastic diaphragm and an opening and closing valve, the inside of the shell has a clean water cavity and a channel, the center tube is installed in the clean water cavity, a plurality of water passing holes are arranged on the outer circumferential surface of the center tube, the inner cavity of the center tube is communicated with the clean water cavity through the water passing holes, the filter membrane is installed in the clean water cavity and wrapped outside the center tube, the elastic diaphragm is installed on the shell and surrounds a water storage cavity with the shell, the water storage cavity is communicated with the inner cavity of the center tube through the channel, and the opening and closing valve is installed in the channel and used for opening and closing the channel.

2. The filter cartridge of claim 1 wherein, The channel comprises a water inlet channel and a water outlet channel, one end of the water inlet channel is communicated with the inner cavity of the center tube, the other end of the water inlet channel is communicated with the water storage cavity, the region between the outer side of the filter membrane and the shell is a raw water area, one end of the water outlet channel is communicated with the raw water area, the other end of the water outlet channel is communicated with the water storage cavity, the opening and closing valve comprises a gravity sensing automatic switch and a pressure sensing automatic switch, the gravity sensing automatic switch is installed in the water inlet channel and used for opening the water inlet channel when the pressure difference between the clean water cavity and the water storage cavity exceeds a first preset pressure, and the pressure sensing automatic switch is installed in the water outlet channel and used for opening the water outlet channel when the pressure difference between the water storage cavity and the clean water cavity exceeds a second preset pressure.

3. The filter cartridge of claim 2 wherein, The water inlet channel is provided with a containing cavity, the bottom of the containing cavity is provided with a sealing opening, the gravity sensing automatic switch comprises a gravity ball, the gravity ball is installed in the containing cavity and can float in the containing cavity to open or close the sealing opening, and the upper portion of the containing cavity is provided with a limiting structure for preventing the gravity ball from sliding out of the containing cavity.

4. The filter cartridge of claim 2 wherein, The water outlet channel is provided with a containing cavity, one end of the containing cavity towards the water storage cavity is provided with a flow hole, the pressure sensing automatic switch comprises a sealing ball and an elastic element, the sealing ball is installed in the containing cavity and can float in the containing cavity to open or close the flow hole, and the two ends of the elastic element are connected with the sealing ball and the shell respectively so that the sealing ball closes the flow hole in the direction from the clean water cavity to the water storage cavity.

5. The filter cartridge of claim 2 wherein, The number of the water outlet channels is two, and the two water outlet channels are arranged on the two sides of the center tube in the radial direction.

6. The filter cartridge of claim 2 wherein, The center tube is vertically arranged, the outlet of the water outlet channel is located at the upper end of the filter membrane, and the wastewater outlet of the filter element is located at the lower end of the filter membrane.

7. The filter cartridge of claim 1 wherein, The elastic diaphragm also surrounds a gas storage cavity with the shell, the gas storage cavity and the water storage cavity are located on the two sides of the elastic diaphragm respectively, and the shell is further provided with a sealed inflation opening, the inflation opening is used for inflating the gas storage cavity.

8. The filter cartridge of claim 1 wherein, The shell comprises a cylinder and a water quality displacer, the water quality displacer is installed at the upper end of the cylinder, the water quality displacer is clamped and connected to the cover of the cylinder, the water purification cavity is arranged in the interior of the cylinder, the water storage cavity is arranged in the interior of the water quality displacer, and the interfaces of the cylinder and the water quality displacer are correspondingly arranged to form the channel.

9. The filter cartridge of claim 1 wherein, The center pipe is vertically arranged, and the upper end opening of the center pipe is communicated with the lower end of the channel.

10. A water purifier characterized by comprising: The water purifier comprises the filter element according to any one of claims 1-9.

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