A composite filter element and a water circuit system using the same

Abstract

The present invention discloses a composite filter element and a water circuit system using the same, which are applied to the water circuit system of a water purifier. The composite filter element is provided with a needle valve, a first cavity and a second cavity that are not communicated with each other; the first cavity is provided with a first filtration module; the second cavity is provided with a second filtration module and an airbag; the composite filter element is provided with a raw water inlet, a primary filtration outlet, a pure water inlet and a purified water outlet; the raw water inlet is communicated with the inlet end of the first filtration module, and the primary filtration outlet is communicated with the outlet end of the first filtration module; the pure water inlet is communicated with the inlet end of the second filtration module, and the purified water outlet is communicated with the outlet end of the second filtration module; the needle valve is used to inflate the airbag; the airbag is used to provide pressure for the second cavity when the purified water outlet is blocked, so that the water in the second cavity flows out from the pure water inlet. The present invention can use the pressure of the airbag to backwash the RO membrane filter element when the water circuit system is on standby, avoiding the problem that the TDS value of the first-stage effluent is relatively high after a long time of standby.

Description

Technical Field

[0001] The present invention relates to the technical field of water purifiers, and particularly relates to a composite filter element and a water circuit system using the same. Background Art

[0002] At present, with the development of society, people pay more and more attention to health problems. Since tap water contains many substances that are not conducive to health, more and more people will install water purification equipment at home to filter tap water. Currently, the water purification equipment mainly relies on a reverse osmosis membrane (RO membrane) to filter tap water. The water purification equipment uses the RO membrane to separate water from impurities such as inorganic salts, heavy metal ions, organic substances, colloids, bacteria, and viruses in tap water under pressure. During the standby process of the water purification equipment, tap water, wastewater, and pure water coexist in the RO membrane filter element. Among them, the raw water and wastewater are both in front of the membrane of the RO membrane filter element, while the pure water is behind the membrane of the RO membrane filter element. Moreover, the total dissolved solids (TDS) value in the tap water and wastewater is much higher than that of the pure water. Therefore, when the water purification equipment is in the standby state for a long time, the ions in the tap water and wastewater will gradually diffuse into the pure water, resulting in an increase in the TDS value of the pure water. When the water purification equipment is started up next time, the TDS value of the water discharged from the front section will be relatively high, affecting the health of users. Summary of the Invention

[0003] The purpose of the present invention is to provide a composite filter element and a water circuit system using the same to solve the above problems.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] A composite filter element is applied to the water circuit system of a water purifier. The composite filter element is provided with a needle valve, a first cavity and a second cavity that are not communicated with each other. The first cavity is provided with a first filtration module. The second cavity is provided with a second filtration module and an airbag. The composite filter element is provided with a raw water inlet, a primary filtration outlet, a pure water inlet and a purified water outlet. The raw water inlet is communicated with the inlet end of the first filtration module, and the primary filtration outlet is communicated with the outlet end of the first filtration module. The pure water inlet is communicated with the inlet end of the second filtration module, and the purified water outlet is communicated with the outlet end of the second filtration module.

[0006] The air outlet end of the needle valve is communicated with the inside of the airbag, and the air inlet end of the needle valve is communicated with the outside of the composite filter. The needle valve is used to inflate the airbag.

[0007] The airbag is used to provide pressure for the second cavity when the purified water outlet is blocked, so that the water in the second cavity flows out from the pure water inlet.

[0008] Preferably, the composite filter element includes a housing, a partition plate, an upper cover, an inlet conduit, an outlet conduit, an upper end cap, and a lower end cap;

[0009] The partition plate is disposed inside the housing and divides the interior of the housing into the first cavity and the second cavity;

[0010] The upper cover is disposed on the top of the first filtration module, and the bottom of the first filtration module abuts against the upper surface of the partition plate; a raw water channel is formed between the outside of the first filtration module and the housing; the raw water inlet is communicated with the raw water channel; a primary filtration channel is formed inside the first filtration module, and the primary filtration outlet is communicated with the primary filtration channel;

[0011] The upper end cap is disposed on the top of the second filtration module, and the lower end cap is disposed on the bottom of the second filtration module; a pure water channel is formed between the outside of the second filtration module and the inner wall of the first cavity; a purified water channel is formed inside the second filtration module;

[0012] The upper end of the inlet conduit is connected to the pure water inlet, and the lower end is communicated with the pure water channel;

[0013] The upper end of the outlet conduit is connected to the purified water outlet, and the lower end is communicated with the purified water channel;

[0014] The airbag is disposed at the bottom of the second filtration module.

[0015] Preferably, the composite filter element further includes an inner housing and a bottom cover; the upper end of the inner housing is connected to the partition plate; the bottom cover is provided with a pressing portion, a threaded connection portion, and a fastening portion. The side of the airbag is inserted between the inner wall of the threaded connection portion and the outer wall of the pressing portion. The bottom of the inner housing is threadedly connected to the inner wall of the threaded connection portion, and the inner housing presses the side of the airbag; an opening is provided at the bottom of the housing, and the fastening portion and the opening are fastened to each other.

[0016] Alternatively, the composite filter element further includes an inner housing and a bottom cover, and the upper end of the inner housing is connected to the partition plate; the side of the airbag is welded to the top surface of the bottom cover; the bottom cover is provided with a fastening portion, an opening is provided at the bottom of the housing, and the fastening portion and the opening are fastened to each other.

[0017] Preferably, a handle is provided at the bottom of the bottom cover. An injection valve cavity is formed inside the handle. The handle is of an oblong structure or a rounded rectangular structure; the injection valve is disposed in the injection valve cavity; the airbag can be inflated through the injection valve; the composite filter element further includes a silica gel cover, and the silica gel cover is fastened to the opening end of the injection valve cavity to seal the injection valve cavity.

[0018] Preferably, a connector is provided at the top of the housing. The connector is located above the first cavity. A step is formed at the connection between the connector and the first cavity. The bottom surface of the step is provided with a plurality of first support ribs. The top surface of the upper cover abuts against the bottom of the first support ribs. A first water passage is formed between two adjacent first support ribs and the top surface of the upper cover. Inside the connector, a first water barrier ring and a second water barrier ring are sequentially arranged from outside to inside. The raw water inlet is communicated with the raw water passage through the space between the first water barrier ring and the inner wall of the connector and the first water passage. The primary filter outlet is communicated with the primary filter passage through the space between the first water barrier ring and the second water barrier ring.

[0019] Preferably, a third water barrier ring is further provided inside the connector. The third water barrier ring is arranged inside the second water barrier ring. The pure water inlet is communicated with the pure water passage through the space between the third water barrier ring and the second water barrier ring. The purified water outlet is communicated with the purified water passage through the space enclosed by the third water barrier ring.

[0020] Preferably, a first through hole is provided in the middle of the upper cover. The edge of the first through hole extends upward to form an outer ring portion. The outer wall of the outer ring portion abuts against the inner wall of the first water barrier ring. A second water passage is formed between the inner wall of the outer ring portion and the outer wall of the second water barrier ring.

[0021] Preferably, the outer wall of the upper end of the water inlet conduit abuts against the inner wall of the second water barrier ring. The water outlet conduit is arranged inside the water inlet conduit. The upper cover is further provided with an inner ring portion. The inner ring portion is arranged inside the outer ring portion. The outer ring portion and the inner ring portion are connected by a plurality of connecting ribs. The inner wall of the inner ring portion abuts against the outer wall of the water inlet conduit. The composite filter element further includes a seal. The seal is sleeved on the upper end of the water outlet conduit. The outer wall of the seal abuts against the inner wall of the third water barrier ring.

[0022] A water circuit system uses a composite filter element as described above.

[0023] The beneficial effects of the present invention are as follows: After the water intake is completed, the airbag in the composite filter element can provide pressure for the second cavity, so that the pure water stored in the second cavity can flow out reversely from the pure water inlet and flow to the RO membrane filter element, thereby performing reverse flushing on the RO membrane filter element. During the reverse flushing process, the wastewater in the RO membrane filter element can be discharged, thus avoiding the problem that the wastewater in front of the membrane in the RO membrane filter element contaminates the pure water behind the membrane during the standby process of the water purification device water circuit system; when the water intake device is opened next time, since the wastewater in the RO membrane has been discharged after the previous water intake is completed, clean pure water can be directly obtained, effectively avoiding the problem that the TDS value of the water output at the front end of the water purification device water circuit system is relatively high. In addition, the present invention is also provided with a needle valve, and the airbag can be conveniently inflated by using the needle valve, avoiding the problem that the airbag cannot provide sufficient pressure to perform reverse flushing on the RO membrane filter element due to insufficient air pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings further illustrate the present invention, but the content in the drawings does not constitute any limitation to the present invention.

[0025] Figure 1 It is a schematic diagram of the water purification device water circuit system of one embodiment of the present invention;

[0026] Figure 2 It is a schematic structural diagram of the reverse osmosis check valve of one embodiment of the present invention;

[0027] Figure 3 It is a schematic structural diagram of the valve core of one embodiment of the present invention;

[0028] Figure 4 It is a schematic cross-sectional structural diagram of the composite filter of one embodiment of the present invention;

[0029] Figure 5 It is a schematic partial structural diagram of the composite filter of one embodiment of the present invention;

[0030] In the attached drawings: 10 - composite filter element, 101 - first cavity, 102 - second cavity, 103 - first filtration module, 104 - second filtration module, 105 - airbag, 106 - raw water inlet, 107 - preliminary filtration outlet, 108 - pure water inlet, 109 - purified water outlet, 111 - housing, 1111 - connector, 1112 - first support rib, 1113 - first water isolation ring, 1114 - second water isolation ring, 1115 - third water isolation ring, 112 - partition board, 113 - upper cover, 1131 - first through hole, 1132 - outer ring part, 1133 - inner ring part, 1134 - connecting rib, 114 - water inlet conduit, 115 - water outlet conduit, 116 - upper end cover, 117 - lower end cover, 118 - raw water channel, 119 - primary filtration channel, 121 - pure water channel, 122 - purified water channel, 123 - inner housing, 124 - bottom cover, 1241 - pressing part, 1242 - handle, 1243 - needle valve cavity, 125 - needle valve, 126 - silica gel cover, 127 - seal, 2 - water inlet pipe, 3 - RO membrane filter element, 31 - water inlet end, 32 - water outlet end, 33 - waste water end, 4 - primary filtration branch, 5 - secondary filtration branch, 6 - water outlet pipe, 7 - water intake device, 8 - water inlet valve, 9 - pressurization device, 20 - waste water pipe, 30 - waste water valve, 40 - reverse osmosis check valve, 401 - valve body, 4011 - limiting part, 4012 - convex block, 402 - water inlet joint, 403 - water outlet joint, 404 - pressing ring, 405 - valve core, 4051 - supporting part, 4052 - duckbill part, 4053 - support rib, 50 - check valve, 60 - high pressure switch. Detailed implementation mode

[0031] The technical solution of the present invention will be further described below in conjunction with the attached drawings and through specific implementation modes.

[0032] A composite filter element of this embodiment is applied to the water circuit system of a water purifier, as Figures 1-5 shown. The water circuit system includes:

[0033] The composite filter element 10, which is provided with a needle valve 125, a first cavity 101 and a second cavity 102 that are not communicated with each other; the first cavity 101 is provided with a first filtration module 103; the second cavity 102 is provided with a second filtration module 104 and an airbag 105; the composite filter element 10 is provided with a raw water inlet 106, a preliminary filtration outlet 107, a pure water inlet 108 and a purified water outlet 109; the raw water inlet 106 is communicated with the water inlet end 31 of the first filtration module 103, and the preliminary filtration outlet 107 is communicated with the water outlet end 32 of the first filtration module 103; the pure water inlet 108 is communicated with the water inlet end 31 of the second filtration module 104, and the purified water outlet 109 is communicated with the water outlet end 32 of the second filtration module 104;

[0034] A water inlet pipe 2, one end of the water inlet pipe 2 is connected to an external water source, and the other end is connected to the raw water inlet 106;

[0035] A RO membrane filter element 3, having a water inlet end 31, a water outlet end 32 and a wastewater end 33;

[0036] A primary filtration branch 4, one end of the primary filtration branch 4 is connected to the primary filtration water outlet 107, and the other end is connected to the water inlet end 31 of the RO membrane filter element 3;

[0037] A secondary filtration branch 5; one end of the secondary filtration branch 5 is connected to the water outlet end 32 of the RO membrane filter element 3, and the other end is connected to the pure water inlet 108;

[0038] A water outlet pipe 6, one end of the water outlet pipe 6 is connected to the purified water outlet 109;

[0039] A water intake device 7, installed at the other end of the water outlet pipe 6; as one implementation, the water intake device is a faucet;

[0040] A water inlet valve 8, installed on the primary filtration branch 4;

[0041] A pressurizing device 9, installed on the primary filtration branch 4 and located between the water inlet valve 8 and the water inlet end 31 of the RO membrane filter element 3; as one embodiment, the pressurizing device 9 is a booster pump;

[0042] A wastewater pipe 20, one end of the wastewater pipe 20 is connected to the wastewater end 33 of the RO membrane filter element 3;

[0043] A wastewater valve 30, installed on the wastewater pipe 20;

[0044] An anti - reverse osmosis check valve 40, installed on the secondary filtration branch 5; the anti - reverse osmosis check valve 40 is used for forward conduction and reverse throttling;

[0045] The air outlet end of the needle valve 125 is communicated with the inside of the airbag 105, and the air inlet end of the needle valve 125 is communicated with the outside of the composite filter element 10; the needle valve 125 is used for inflating the airbag 105;

[0046] The airbag 105 is used for when the water intake device 7 is closed, providing pressure for the second cavity 102, so that the water in the second cavity 102 flows reversely through the secondary filtration branch 5 into the RO membrane filter element 3 to wash the RO membrane filter element 3.

[0047] During normal water production, first open the water intake device 7, and the pressurization device 9 and the water inlet valve 8 are started and opened as the water intake device 7 is opened; raw water enters the first filtration module 103 inside the composite filter element through the water inlet pipe 2 and the raw water inlet 106, and the first filtration module 103 filters the raw water; the primary filtered water after filtration flows out from the primary filtration outlet 107, and then enters the RO membrane filter element 3 through the primary filtration branch 4. The pressurization device 9 can pressurize the water in the primary filtration branch 4 so that the water entering the RO membrane filter element 3 has enough pressure to pass through the RO membrane, thereby achieving a higher water production efficiency; the RO membrane filter element 3 filters the primary filtered water into pure water, and the pure water flows out from the water outlet end 32 of the RO membrane, passes through the secondary filtration branch 5 and the pure water inlet 108, and enters the second filtration module 104 inside the composite filter element, and the second filtration module 104 filters the pure water; as one implementation, the first filtration module 103 includes an outer layer and an inner layer, the outer layer is a PP cotton, and the inner layer is a pre-activated carbon filter rod; the second filtration module 104 is a post-activated carbon filter rod.After the pure water is filtered by the second filtration module 104, it flows out from the purified water outlet 109, and then flows out from the water intake device 7 through the water outlet pipe 6. At this time, the user can normally draw water. When the water intake device 7 is closed, the pressurization device 9 and the water inlet valve 8 continue to maintain the startup state and the open state, so as to continue water production. Since the water intake device 7 is closed, the pure water will temporarily stay in the second cavity 102 of the composite filter element 10, and as the water pressure in the second cavity 102 gradually increases, the airbag 105 will be gradually compressed. After a certain period of time, or when the water pressure in the second cavity 102 reaches a certain value, the pressurization device 9 and the water inlet valve 8 are closed, and the wastewater valve 30 is opened. Due to the closing of the pressurization device 9, the pressure at the water outlet end 32 of the RO membrane filter element 3 becomes smaller and is less than the water pressure in the second cavity 102. Therefore, the water in the second cavity 102 begins to flow reversely under the pressure of the airbag 105 and flows into the water outlet end 32 of the RO membrane filter element 3 through the secondary filtration branch 5, so as to perform reverse flushing on the RO membrane filter element 3. Since the reverse osmosis check valve 40 is provided in the secondary filtration branch 5, when the RO membrane is normally producing water, the pure water flows from the water outlet end 32 of the RO membrane filter element 3 to the pure water inlet 108 of the composite filter element 10. At this time, it is a forward flow, and the reverse osmosis check valve 40 is in a conducting state. When the pure water in the second cavity 102 flows reversely through the reverse osmosis check valve 40 of the secondary filtration branch 5 to the water outlet end 32 of the RO membrane under the pressure of the airbag 105, in this process, the reverse osmosis check valve 40 plays a throttling role, so that the reversely flowing pure water can flow to the water outlet end 32 of the RO membrane at a lower pressure and flow rate, which can play a role in protecting the RO membrane. If the water in the second cavity 102 is directly squeezed to the water outlet end 32 of the RO membrane by the pressure of the airbag 105 and flows into the RO membrane from the water outlet end 32, the RO membrane will be irreversibly damaged due to back pressure at this time. Therefore, the present invention provides a reverse osmosis check valve 40 in the secondary filtration branch 5. The reverse osmosis check valve 40 can be normally conducted during water production and plays a throttling role during reverse flushing, so as to not only ensure that the water circuit system of the water purifier can normally perform water production work, but also protect the RO membrane filter element 3 during reverse flushing to avoid the problem of damage due to back pressure during reverse flushing. During the reverse flushing process, the wastewater valve 30 is opened, and the wastewater in the RO membrane filter element 3 is discharged through the wastewater outlet and the wastewater valve 30. After reverse flushing, the wastewater in the RO membrane filter element 3 can be discharged, thus avoiding the problem that the pre-membrane wastewater in the RO membrane filter element 3 contaminates the post-membrane pure water during the standby process of the water circuit system of the water purifier. When the water intake device 7 is opened next time, since the wastewater in the RO membrane has been discharged after the last water intake, clean pure water can be directly obtained, effectively avoiding the problem that the TDS value of the water outlet at the front end of the water circuit system of the water purifier is relatively high. The airbag 105 can be inflated at any time through the needle valve 125 to avoid the problem that the airbag 105 cannot perform reverse flushing due to insufficient pressure.

[0048] Further, as shown in Figure 2 and 3 the reverse osmosis check valve 40 includes a valve body 401, a water inlet joint 402, a water outlet joint 403, a pressing ring 404 and a valve core 405; the valve body 401 is tubular, and a limiting portion 4011 is provided inside the valve body 401; the water inlet joint 402 is arranged at one end of the valve body 401, and the water outlet joint 403 is arranged at the other end of the valve body 401; the valve core 405 is elastic, and the valve core 405 includes a support portion 4051 and a duckbill portion 4052 of an integral structure. The support portion 4051 is formed with a water inlet, and the duckbill portion 4052 is formed with a water outlet. A plurality of support ribs 4053 are arranged on the inner wall of the duckbill portion 4052, and the support ribs 4053 are used to make there be a gap when the duckbill portion 4052 is closed; the valve core 405 is arranged inside the valve body, the duckbill portion 4052 faces the water outlet joint 403, the pressing ring 404 is arranged between the water outlet joint 403 and the limiting portion 4011, and the pressing ring 404 presses the support portion 4051 against the limiting portion 4011; the water inlet joint 402 is connected to the water outlet end 32 of the RO membrane filter element 3 through the secondary filtration branch 5; the water outlet joint 403 is connected to the pure water inlet 108 of the composite filter element 10 through the secondary filtration branch 5; the limiting portion 4011 is provided with a convex block 4012, and the convex block 4012 is inserted into the support portion.

[0049] The check valve 50 adopts a duckbill-like structure. When the water flows forward, that is, water enters from the inlet side and exits from the outlet side. At this time, the internal pressure of the valve core 405 is greater than the external pressure. Since the valve core 405 is elastic, the inner wall of the duckbill part 4052 is affected by the water pressure, so that the duckbill part 4052 opens. At this time, the reverse osmosis check valve 40 is in a conducting state; when the water flows reversely, that is, water enters from the outlet side and exits from the inlet side. At this time, the external pressure of the valve core 405 is greater than the internal pressure, and the outer wall of the duckbill part 4052 is affected by the water pressure, so that the duckbill part 4052 closes. Since several support ribs 4053 are provided on the inner wall of the duckbill part 4052, the duckbill part 4052 cannot be completely closed. Instead, when it closes, several gaps are formed between the inner walls of the duckbill part 4052. At this time, the water at the outlet end can leak to the inlet side through these gaps, thus playing a throttling role. Such a setting can reduce the pressure during the reverse flushing of the RO membrane filter element 3, thereby playing a better protective role for the RO membrane filter element 3. Since the valve core 405 is elastic, when the external pressure of the valve core 405 is greater than the internal pressure, the support part 4051 will also deform inward due to the pressure on the outer wall, and the convex block 4012 is inserted into the support part. This can prevent the support part 4051 from being completely closed under pressure, so that the support part 4051 can always remain open, so that the water at the outlet can pass through the valve core 405 during reverse flushing.

[0050] As Figure 1 shown, it further includes a check valve 50 and a high-pressure switch 60. The check valve 50 and the high-pressure switch 60 are both arranged on the outlet pipe 6; the high-pressure switch 60 is located between the check valve 50 and the water intake device 7; the high-pressure switch 60 is electrically connected to the booster device 9 and the water inlet valve 8 respectively.

[0051] When the water purification device is turned off, the booster device 9 continues to work so that the RO membrane can continue to produce water, and the pressure of the outlet pipe 6 gradually rises. When the pressure of the outlet pipe 6 reaches the threshold value of the high-pressure switch 60, the high-pressure switch 60 controls the booster device 9 and the water inlet valve 8 to close, and the check valve 50 can keep the state between the check valve 50 and the water intake device 7 at a high pressure, thus preventing the booster device 9 from starting in the standby state.

[0052] As Figure 4 and 5 shown, the composite filter element 10 includes a housing 111, a partition 112, an upper cover 113, an inlet conduit 114, an outlet conduit 115, an upper end cover 116 and a lower end cover 117;

[0053] The partition 112 is arranged inside the housing and divides the interior of the housing 111 into the first cavity 101 and the second cavity 102;

[0054] The upper cover 113 is disposed on the top of the first filtration module 103, and the bottom of the first filtration module 103 abuts against the upper surface of the partition plate 112; a raw water channel 118 is formed between the outside of the first filtration module 103 and the housing 111; the raw water inlet 106 is communicated with the raw water channel 118; a primary filtration channel 119 is formed inside the first filtration module 103, and the primary filtration outlet 107 is communicated with the primary filtration channel 119;

[0055] The upper end cover 116 is disposed on the top of the second filtration module 104, and the lower end cover 117 is disposed on the bottom of the second filtration module 104; a pure water channel 121 is formed between the outside of the second filtration module 104 and the inner wall of the first cavity 101; a purified water channel 122 is formed inside the second filtration module 104;

[0056] The upper end of the water inlet conduit 114 is connected to the pure water inlet 108, and the lower end is communicated with the pure water channel 121;

[0057] The upper end of the water outlet conduit 115 is connected to the purified water outlet 109, and the lower end is communicated with the purified water channel 122;

[0058] The airbag 105 is disposed at the bottom of the second filtration module 104.

[0059] The partition plate 112 divides the interior of the housing 111 into a first cavity 101 and a second cavity 102, which can separate the first filtration module 103 and the second filtration module 104 of the composite filter element 10, thereby avoiding the phenomenon of water cross-flow between the first cavity 101 and the second cavity 102. The upper cover 113 and the partition plate 112 can block the top and bottom of the first filtration module 103, so that the raw water can only flow into the interior of the first filtration module 103 from the side of the first filtration module 103 to ensure that the raw water can be fully preliminarily filtered; after the raw water enters the composite filter element 10 from the raw water inlet 106, it flows into the raw water channel 118, and then enters the primary filtration channel after being filtered by the first filtration module 103, and then flows out from the primary filtration outlet 107; while the pure water filtered by the RO membrane filter element 3 enters the composite filter element from the pure water inlet 108, and then flows downward along the water inlet conduit 114 into the pure water channel; the upper end cover 116 and the lower end cover 117 are respectively used to block the top and bottom of the second filtration module 104, which also plays the role of fully filtering the pure water. The second filtration module 104 can adopt a post-activated carbon rod, which can adsorb the odor in the pure water, thereby improving the taste of the water. After being filtered by the second filtration module 104, the pure water enters the interior of the second filtration module 104, then flows upward along the water outlet conduit 115, and finally flows out from the purified water outlet 109. The present invention integrates the pre-filtration and post-filtration into a composite filter element, which can make full use of the space of the filter element, reduce the volume of the water circuit system of the water purifier, and make the connection of the external water circuit simpler. In addition, since the space below the second filtration module 104 is only used to arrange the airbag 105, a complete space can be left for the airbag 105, so that the airbag 105 is easier to install, and it can also make the thickness of the airbag 105 the same everywhere when it expands or contracts; if the airbag 105 is arranged above the second filtration module 104, the airbag 105 will be interfered by the water inlet conduit 114 and the water outlet conduit 115, so the airbag 105 needs to be set as a special-shaped structure, such as an annular structure. This not only has the problem of difficult installation, but also the thickness of the airbag 105 is uneven everywhere when it expands or contracts, the inner side is thicker, and the outer side is thinner. Over time, it is easy for the outer side of the airbag 105 to lose elasticity or even rupture, so the service life of the filter element is difficult to guarantee.

[0060] As one of the implementation manners, the composite filter element 10 further includes an inner housing 123 and a bottom cover 124; the upper end of the inner housing 123 is connected to the partition plate 112; the bottom cover 124 is provided with a pressing portion 1241, a threaded connection portion 1242, and a fastening portion 1243. The side of the airbag 105 is inserted between the inner wall of the threaded connection portion 1242 and the pressing portion 1241. The bottom of the inner housing 123 is threadedly connected to the inner wall of the threaded connection portion 1242, and the inner housing 123 presses the side of the airbag 105; an opening is provided at the bottom of the housing 111, and the fastening portion 1243 and the opening are fastened to each other.

[0061] The top of the inner housing 123 is connected to the partition plate 112, and its bottom is connected to the bottom cover 124, which can further separate the second cavity 102 from the first cavity 101. When leakage occurs between the partition plate 112 and the inner wall of the housing 111, the inner housing 123 can still separate the first cavity 101 from the second cavity 102, further preventing the problem of water cross-flow; the bottom cover 124 seals the bottom of the inner housing 123 and presses the side of the airbag 105, so that the inside of the airbag 105 is sealed to avoid air leakage of the airbag 105; since the airbag 105 is made of an elastic material, such as silicone, when the bottom cover 124 and the inner housing 123 are threadedly connected, the inner housing 123 can press the side of the airbag 105 between the inner wall of the threaded connection portion 1242 and the pressing portion 1241. The side of the airbag 105 can seal the gap between the bottom cover 124 and the inner housing 123 through elastic deformation, thus playing a sealing role without the need to use an additional sealing ring for sealing. This can reduce the use of sealing rings and is more convenient for installation; the pressing portion 1241 can limit the side of the airbag 105 to prevent the side of the airbag 105 from shrinking inward to ensure the sealing effect of the airbag 105. The bottom cover 124 seals the bottom of the composite filter element 10 to prevent water leakage.

[0062] As another implementation manner, the composite filter element 10 further includes an inner housing 123 and a bottom cover 124. The upper end of the inner housing 123 is connected to the partition plate 112; the side of the airbag 105 is welded to the top surface of the bottom cover 124; the bottom cover 124 is provided with a fastening portion 1243, and an opening is provided at the bottom of the housing 111. The fastening portion 1243 and the opening are fastened to each other. The airbag 105 and the bottom cover 124 are connected and fixed by welding, which not only has better connection strength, but also has better sealing performance between the airbag 105 and the bottom cover 124, and air leakage is not likely to occur.

[0063] Further, the composite filter element 10 further includes a needle valve 125; a handle 1242 is provided at the bottom of the bottom cover 124, and an inner portion of the handle 1242 defines a needle valve cavity 1243. The handle 1244 has an oblong structure or a rounded rectangular structure. The needle valve 125 is disposed in the needle valve cavity 1243, and the airbag 105 can be inflated through the needle valve 125. The composite filter element 10 further includes a silica gel cover 126, and the silica gel cover 126 is fastened to an opening end of the needle valve cavity 1243 to seal the needle valve cavity 1243.

[0064] The needle valve 125 is disposed in the needle valve cavity 1245 by a secondary injection molding process. The airbag 105 can be conveniently inflated through the needle valve 125 so that the airbag 105 can obtain sufficient air pressure after the composite filter element 10 is assembled. Of course, during long-term use, there may be a certain air leakage phenomenon in the airbag 105. When the airbag 105 leaks air, the pressure of the airbag 105 will become smaller, thereby affecting the backwashing effect on the RO membrane filter element 3. At this time, the airbag 105 can be re-inflated through the needle valve 125 to ensure that the airbag 105 has sufficient air pressure. The handle 1244 is set to have an oblong structure or a rounded rectangular structure, which facilitates the rotation of the composite filter element 10. Since the composite filter element 10 usually has a cylindrical structure, when rotating the composite filter element 10, due to the lack of a force application point, when the user rotates the composite filter element 10, the user's hand and the composite filter element 10 are prone to slipping. In the present invention, the handle 1244 is set to have an oblong structure or a rounded rectangular structure. When the composite filter element needs to be rotated, due to the shape of the handle 1244, the user can hold the handle 1244 and then apply force to the filter element, so that the composite filter element 10 rotates, making the installation and disassembly of the composite filter element more convenient.

[0065] Further, as Figure 4 shown, a connector 1111 is provided at the top of the housing 111. The connector 1111 is located above the first cavity 101. A step is formed at the connection between the connector 1111 and the first cavity 101. A plurality of first support ribs 1112 are provided on the bottom surface of the step. The top surface of the upper cover 113 abuts against the bottom of the first support ribs 1112. A first water passage is formed between adjacent two of the first support ribs 1112 and the top surface of the upper cover 113. An inner portion of the connector 1111 is provided with a first water isolation ring 1113 and a second water isolation ring 1114 arranged in sequence from outside to inside. The raw water inlet 106 is communicated with the raw water passage 118 through a space between the first water isolation ring 1113 and the inner wall of the connector 1111 and the first water passage. The primary filter outlet 107 is communicated with the primary filter passage 119 through a space between the first water isolation ring 1113 and the second water isolation ring 1114.

[0066] The bottom surface of the step is provided with a first support rib 1112, so that a first water passage can be left between the top surface of the upper cover 113 and the bottom surface of the step, enabling the raw water entering from the raw water inlet 106 to flow into the raw water passage through the first water passage; the first water isolation ring 1113 and the second water isolation ring 1114 are used to separate the raw water passage 118 and the primary filtration passage 119, thus avoiding the phenomenon of water cross-flow.

[0067] Furthermore, a third water isolation ring 1115 is also provided inside the connector 1111; the third water isolation ring 1115 is arranged inside the second water isolation ring 1114; the pure water inlet 108 is communicated with the pure water passage 121 through the space between the third water isolation ring 1115 and the second water isolation ring 1114; the purified water outlet 109 is communicated with the purified water passage 122 through the space surrounded by the inside of the third water isolation ring.

[0068] The second water isolation ring 1114 and the third water isolation ring 1115 are used to separate the primary filtration passage 119 and the pure water passage 121, and to separate the pure water passage 121 and the purified water passage 122, avoiding the phenomenon of water cross-flow.

[0069] Furthermore, a first through hole 1131 is provided in the middle of the upper cover 113, and the edge of the first through hole 1131 extends upward to form an outer ring portion 1132, and the outer wall of the outer ring portion 1132 abuts against the inner wall of the first water isolation ring 1113; a second water passage is formed between the inner wall of the outer ring portion 1132 and the outer wall of the second water isolation ring 1114.

[0070] The outer ring portion 1132 abuts against the inner wall of the first water isolation ring 1113, so that the raw water passage 118 and the primary filtration passage 119 can be separated, and the primary filtration passage 119 can be communicated with the primary filtration outlet 107 through the second water passage between the inner wall of the outer ring portion 1132 and the outer wall of the second water isolation ring 1114, thus achieving the effect of separating the raw water passage 118 and the primary filtration passage 119.

[0071] Furthermore, the outer wall of the upper end of the water inlet conduit 114 is abutted against the inner wall of the second water-isolating ring 1114, and the water outlet conduit 115 is arranged inside the water inlet conduit 114; the upper cover 113 is also provided with an inner ring portion 1133, and the inner ring portion 1133 is arranged on the inner side of the outer ring portion 1132, and the outer ring portion 1132 and the inner ring portion 1133 are connected by a plurality of connecting ribs 1134; the inner wall of the inner ring portion 1133 is abutted against the outer wall of the water inlet conduit 114; the composite filter element 10 also includes a sealing member 127, and the sealing member 127 is sleeved on the upper end of the water outlet conduit 115, and the outer wall of the sealing member 127 is abutted against the inner wall of the third water-isolating ring 1115.

[0072] The water inlet conduit 114 is sleeved on the outside of the water outlet conduit 115, so that the space inside the water inlet conduit can be fully utilized, thereby reducing the volume of the composite filter element 10; the inner ring portion 1133 can fix the outer wall of the water inlet conduit 114, and the seal 127 can fix the inner wall of the water outlet conduit 115. The seal 127 is abutted against the inner wall of the third water isolation ring 1115, thereby separating the pure water channel 121 and the clean water channel 122.

[0073] A water system uses the composite filter element as described above.

[0074] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific embodiments of the present invention without creative work, and these equivalent variations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A water circuit system applied to a water purifier, characterized in that It includes a composite filter element, which is provided with a needle valve, a first cavity and a second cavity that are not connected to each other; the first cavity is provided with a first filtration module; the second cavity is provided with a second filtration module and an airbag; the composite filter element is provided with a raw water inlet, a primary filtration outlet, a pure water inlet and a purified water outlet; the raw water inlet is communicated with the water inlet end of the first filtration module, and the primary filtration outlet is communicated with the water outlet end of the first filtration module; the pure water inlet is communicated with the water inlet end of the second filtration module, and the purified water outlet is communicated with the water outlet end of the second filtration module; The air outlet end of the needle valve is communicated with the inside of the airbag, and the air inlet end of the needle valve is communicated with the outside of the composite filter element; the needle valve is used to inflate the airbag; RO membrane filter element, having a water inlet end, a water outlet end and a wastewater end; Primary filtration branch, one end of the primary filtration branch is connected to the primary filtration outlet, and the other end is connected to the water inlet end of the RO membrane filter element; Secondary filtration branch; one end of the secondary filtration branch is connected to the water outlet end of the RO membrane filter element, and the other end is connected to the pure water inlet; The airbag is used to provide pressure for the second cavity when the purified water outlet is blocked, so that the water in the second cavity flows out from the pure water inlet; An anti - osmosis check valve is installed in the secondary filtration branch; the anti - osmosis check valve is used for forward conduction and reverse throttling; the anti - osmosis check valve includes a valve body, a water inlet joint, a water outlet joint, a compression ring and a valve core; the valve body is tubular, and a limiting part is arranged inside the valve body; the water inlet joint is arranged at one end of the valve body, and the water outlet joint is arranged at the other end of the valve body; the valve core is elastic, and the valve core includes a support part and a duckbill part with an integrated structure. The support part is formed with a water inlet, and the duckbill part is formed with a water outlet. Several support ribs are arranged on the inner wall of the duckbill part, and the support ribs are used to make there be a gap when the duckbill part is closed; the valve core is arranged inside the valve body, the duckbill part faces the water outlet joint, the compression ring is arranged between the water outlet joint and the limiting part, and the compression ring presses the support part against the limiting part; the water inlet joint is connected to the water outlet end of the RO membrane filter element through the secondary filtration branch; the water outlet joint is connected to the pure water inlet of the composite filter element through the secondary filtration branch; the limiting part is provided with a convex block, and the convex block is inserted into the support part.

2. The water circuit system applied to a water purifier according to claim 1, wherein, The composite filter element includes a shell, a partition plate, an upper cover, a water inlet conduit, a water outlet conduit, an upper end cover and a lower end cover; The partition plate is arranged inside the shell and divides the interior of the shell into the first cavity and the second cavity; The upper cover is arranged on the top of the first filtration module, and the bottom of the first filtration module abuts against the upper surface of the partition plate; a raw water channel is formed between the outside of the first filtration module and the shell; the raw water inlet is communicated with the raw water channel; a primary filtration channel is formed inside the first filtration module, and the primary filtration outlet is communicated with the primary filtration channel; The upper end cover is arranged at the top of the second filtration module, and the lower end cover is arranged at the bottom of the second filtration module; a pure water channel is formed between the outside of the second filtration module and the inner wall of the second cavity; a purified water channel is formed inside the second filtration module; The upper end of the water inlet conduit is connected to the pure water inlet, and the lower end is communicated with the pure water channel; The upper end of the water outlet conduit is connected to the purified water outlet, and the lower end is communicated with the purified water channel; The air bag is arranged at the bottom of the second filtration module.

3. The water circuit system applied to a water purifier according to claim 2, characterized in that: The composite filter element further includes an inner shell and a bottom cover; the upper end of the inner shell is connected to the partition plate; the bottom cover is provided with a pressing part, a threaded connection part and a fastening part. The side of the air bag is inserted between the inner wall of the threaded connection part and the outer wall of the pressing part. The bottom of the inner shell is threadedly connected to the inner wall of the threaded connection part, and the inner shell presses the side of the air bag; an opening is provided at the bottom of the shell, and the fastening part and the opening are fastened to each other.

4. The water circuit system for a water purifier according to claim 2, wherein: The composite filter element further includes an inner shell and a bottom cover, and the upper end of the inner shell is connected to the partition plate; the side of the air bag is welded to the top surface of the bottom cover; the bottom cover is provided with a fastening part, and an opening is provided at the bottom of the shell, and the fastening part and the opening are fastened to each other.

5. The water circuit system applied to a water purifier according to claim 3, wherein: A handle is provided at the bottom of the bottom cover, and a needle valve cavity is formed inside the handle. The handle is in an oblong structure or a rounded rectangular structure; the needle valve is arranged in the needle valve cavity; the air bag can be inflated through the needle valve; the composite filter element further includes a silica gel cover, and the silica gel cover is fastened to the opening end of the needle valve cavity to seal the needle valve cavity.

6. The water circuit system applied to a water purifier according to claim 2, wherein, A connector is provided at the top of the shell. The connector is located above the first cavity. A step is formed at the connection between the connector and the first cavity. A plurality of first support ribs are provided on the bottom surface of the step; the top surface of the upper cover abuts against the bottom of the first support ribs, and a first water passage is formed between two adjacent first support ribs and the top surface of the upper cover; inside the connector, a first water isolation ring and a second water isolation ring are arranged in sequence from outside to inside; the raw water inlet is communicated with the raw water channel through the space between the first water isolation ring and the inner wall of the connector and the first water passage; the primary filtration outlet is communicated with the primary filtration channel through the space between the first water isolation ring and the second water isolation ring.

7. The water circuit system applied to a water purifier according to claim 6, characterized in that, A third water isolation ring is further arranged inside the connector; the third water isolation ring is arranged inside the second water isolation ring; the pure water inlet is communicated with the pure water channel through the space between the third water isolation ring and the second water isolation ring; the purified water outlet is communicated with the purified water channel through the space surrounded by the third water isolation ring.

8. The water circuit system applied to a water purifier according to claim 7, wherein: A first through hole is provided in the middle of the upper cover. The edge of the first through hole extends upward to form an outer ring part. The outer wall of the outer ring part abuts against the inner wall of the first water isolation ring; a second water passage is formed between the inner wall of the outer ring part and the outer wall of the second water isolation ring.

9. The water circuit system applied to a water purifier according to claim 8, wherein: The outer wall of the upper end of the water inlet conduit abuts against the inner wall of the second water isolation ring, and the water outlet conduit is arranged inside the water inlet conduit; the upper cover further has an inner ring part which is arranged inside the outer ring part, and the outer ring part and the inner ring part are connected by a plurality of connecting ribs; the inner wall of the inner ring part abuts against the outer wall of the water inlet conduit; the composite filter element further includes a seal which is sleeved on the upper end of the water outlet conduit, and the outer wall of the seal abuts against the inner wall of the third water isolation ring.

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