Composite filter element and water purifier

Abstract

According to the composite filter element and the water purifier, a water path switching assembly is arranged between a first RO assembly and a second RO assembly, the water inlet end of a first pressure channel of the water path switching assembly is connected with the concentrated water outlet side of the first RO assembly, the water outlet end of the first pressure channel is connected with a concentrated water hole, and the water inlet end of a second pressure channel communicates with the concentrated water outlet side of the first RO assembly; the water inlet end of the third pressure channel is communicated with the pure water hole, the fourth pressure one-way valve only conducts the direction from the pure water output channel of the second RO assembly to the pure water output channel of the first RO assembly in a one-way mode, the purpose of reducing the TDS of the first cup of water can be achieved, a water storage device does not need to be arranged, and only the structure of a filter element needs to be modified. The volume of the water purifier is reduced, and the manufacturing cost and the water leakage risk of the whole machine are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water treatment, in particular to a composite filter element and a water purifier. BACKGROUND

[0002] At present, reverse osmosis technology has been widely used in water purification and other fields, and a typical field is water purifier. Reverse osmosis (RO) is a membrane separation operation driven by pressure difference to separate solvent from solution. That is, pressure is applied to the water inlet on one side of the membrane, and when the pressure exceeds the osmotic pressure, the solvent will reverse the natural direction of osmosis and produce pure water with low total dissolved solids (TDS).

[0003] Since the water purifier is usually used intermittently, when the water purifier is on standby, the external pressure provided by the booster pump will disappear, the reverse osmosis will return to natural osmosis, the total dissolved solids (TDS) of the concentrated water end will diffuse to the pure water end, and the TDS value of the stored pure water will increase, eventually resulting in a higher TDS value of the first cup of water when the user takes the pure water next time. To this end, the user needs to drain water for a period of time to get water with normal TDS value, resulting in poor user experience.

[0004] The pure water membrane soaking scheme can solve such problems, which mainly uses pure water to flush the reverse osmosis treatment unit, and replaces the concentrated water end with low TDS pure water. Since the water on both sides of the membrane is low TDS pure water, the concentration difference between the two ends disappears, so the TDS of the stored pure water will not increase, solving the problem of high TDS of the first cup of water.

[0005] However, the pure water membrane soaking scheme now needs to set a water storage device, and a lot of concentrated water needs to be discharged when storing pure water. Moreover, the water storage device needs to occupy a considerable volume, increasing the volume of the water purifier, increasing the manufacturing cost, and increasing the risk of water leakage of the whole machine. CONTENT OF THE INVENTION

[0006] The purpose of the present application is to provide a composite filter element and a water purifier, which can reduce the TDS of the first cup of water, do not need to set a water storage device, only need to modify the structure of the filter element, reduce the volume of the water purifier, and reduce the manufacturing cost and the risk of water leakage of the whole machine.

[0007] The embodiments of the present application can be implemented as follows:

[0008] In a first aspect, the utility model provides a composite filter element, which comprises a barrel body and a first RO assembly, a water route switching assembly and a second RO assembly arranged in the barrel body in sequence.

[0009] The barrel is provided with a water inlet hole, a pure water hole and a concentrated water hole;

[0010] The water inlet side of the first RO component is communicated with the water inlet hole, and the pure water output channel of the first RO component is communicated with the pure water hole;

[0011] The pure water output channel of the first RO component is unidirectionally communicated with the pure water output channel of the second RO component through a fourth pressure check valve, the unidirectional communication direction is from the pure water output channel of the second RO component to the pure water output channel of the first RO component, and the fourth pressure check valve is opened when the positive water pressure is large and is closed when the positive water pressure is small;

[0012] The concentrated water outlet side of the second RO component is communicated with the concentrated water hole;

[0013] The water path switching component has a first pressure channel, a second pressure channel and a third pressure channel, the first pressure channel is opened when the positive water pressure is small and is closed when the positive water pressure is large, and the second pressure channel and the third pressure channel are opened when the positive water pressure is large and are closed when the positive water pressure is small;

[0014] The water inlet end of the first pressure channel is connected with the concentrated water outlet side of the first RO component, and the water outlet end is connected with the concentrated water hole;

[0015] The water inlet end of the second pressure channel is communicated with the concentrated water outlet side of the first RO component;

[0016] The water inlet end of the third pressure channel is communicated with the pure water hole;

[0017] The water outlet end of the second pressure channel and the third pressure channel are connected with the water inlet side of the second RO component.

[0018] In an optional embodiment, the water path switching component includes a water path switching module, a first pressure check valve, a second pressure check valve and a third pressure check valve, the water path switching module is connected with the first RO component and the second RO component respectively, the water path switching module is formed with the first pressure channel, the second pressure channel and the third pressure channel, the first pressure check valve is arranged in the first pressure channel, the second pressure check valve is arranged in the second pressure channel, and the third pressure check valve is arranged in the third pressure channel.

[0019] In an optional embodiment, the water path switching module further has a bridging channel, two ends of the bridging channel are communicated with the second pressure channel and the second pressure channel respectively, and the communication positions are located on the downstream sides of the second pressure check valve and the third pressure check valve respectively.

[0020] In an optional embodiment, the water path switching module further comprises a first flow limiting cover arranged at the water outlet end of the first pressure channel, and the first flow limiting cover is provided with a first water hole.

[0021] In an optional embodiment, the first RO assembly comprises an inner barrel, a first RO and an end cover arranged in the inner barrel.

[0022] The end cover is fixed to the barrel body.

[0023] The water inlet end of the first RO is clamped into the end cover and communicates with the water inlet hole; the concentrated water outlet end of the first RO is fixed to the water path switching assembly and communicates with the first pressure channel and the second pressure channel; the pure water output channel of the first RO unidirectionally communicates with the pure water output channel of the second RO assembly.

[0024] One end of the inner barrel is fixed to the barrel body and the other end is fixed to the water path switching assembly; a transition cavity is formed between the inner wall of the barrel body and the first RO, and the transition cavity communicates with the pure water hole and the third pressure channel.

[0025] In an optional embodiment, one side of the water path switching assembly facing the first RO is provided with a first connecting ring, and the water inlet end of the first RO is clamped into the first connecting ring.

[0026] In an optional embodiment, the second RO assembly comprises a second flow limiting cover and a second RO.

[0027] The water inlet end of the second RO is fixed to the water path switching assembly and communicates with the second pressure channel and the third pressure channel; the pure water output channel of the second RO unidirectionally communicates with the pure water output channel of the first RO assembly.

[0028] The second flow limiting cover is sleeved on the concentrated water outlet end of the second RO, and the second flow limiting cover is provided with a second water hole, and the second water hole communicates with the concentrated water hole.

[0029] In an optional embodiment, one side of the water path switching assembly facing the second RO is provided with a second connecting ring, and the water inlet end of the second RO is clamped into the second connecting ring.

[0030] In an optional embodiment, the first RO assembly, the water path switching assembly and the second RO assembly jointly form a concentrated water cavity with the inner wall of the barrel body, the concentrated water cavity communicates with the concentrated water hole, and the first pressure channel and the concentrated water outlet side of the second RO assembly communicate with the concentrated water cavity.

[0031] And / or, the volume of the second RO assembly is greater than the volume of the first RO assembly.

[0032] In a second aspect, the utility model provides a water purifier, including the composite filter core of any one of preceding embodiment.

[0033] Compared with the prior art, the beneficial effects of the embodiments of the present application include, for example:

[0034] When the user needs to take water, the tap water in high pressure state is filtered and purified from the water inlet hole into the first RO assembly under the action of the booster pump, the concentrated water impacts the first pressure channel and the second pressure channel, so that the first pressure channel is closed and the second pressure channel is opened, and because the second pressure channel and the third pressure channel are communicated, the concentrated water will impact the third pressure channel in reverse to make the third pressure channel closed, so that the pure water cannot pass through the third pressure channel, and the concentrated water enters the second RO assembly through the third pressure channel for purification and filtration again, and the amount of pure water is large to flush the fourth pressure check valve and the pure water generated by the first RO assembly to be discharged from the pure water hole, and the concentrated water is discharged from the concentrated water hole; and after the water taking is finished, the booster pump is stopped or the power is reduced, the tap water in low pressure state enters the water inlet hole and is filtered and purified by the first RO assembly, because the water pressure is small, the second pressure channel is closed and the first pressure channel is opened, the concentrated water is discharged from the concentrated water hole, and the pure water impacts the third pressure channel to make it open, so that the pure water cannot be discharged from the pure water hole and the filter core will enter the second RO assembly for flushing, the concentrated water after flushing is discharged through the concentrated water hole, and the amount of pure water generated by the second RO assembly is small, so the fourth pressure check valve cannot be flushed, so that the pure water can be retained in the first RO assembly and the second RO assembly, and the natural permeation effect will not be generated, the TDS of the retained pure water will not be increased, so that when the user needs to take water again, the pure water with low TDS can be directly connected, the purpose of reducing the TDS of the first cup of water is achieved, and a water storage device does not need to be arranged, only the structure of the filter core needs to be modified, the volume of the water purifier is reduced, and the manufacturing cost and the risk of leakage of the whole machine are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0036] Figure 1 It is a schematic view of the composite filter core of the embodiments of the present application;

[0037] Figure 2 It is an exploded view of Figure 1

[0038] Figure 3 It is​Figure 1 A sectional view;

[0039] Figure 4 for Figure 3 One of the partial schematic diagrams;

[0040] Figure 5 for Figure 3 Partial schematic diagram two;

[0041] Figure 6 for Figure 3 Partial schematic diagram three;

[0042] Figure 7 for Figure 3 A schematic diagram of the waterway during water intake;

[0043] Figure 8 for Figure 3 A diagram showing the waterway used for rinsing after water intake is completed.

[0044] Icons: 100 - Tank body; 110 - Water inlet; 120 - Pure water inlet; 130 - Concentrate inlet; 140 - Tank lid; 150 - Concentrate chamber; 200 - First RO component; 210 - First RO; 220 - End cap; 230 - Inner tank; 240 - Transition chamber; 300 - Water circuit switching component; 310 - Water circuit switching module; 311 - First pressure channel; 312 - Second pressure channel; 313 - Third pressure channel; 314 - Bridging channel; 315 - First connecting ring; 316 - Second connecting ring; 320 - First pressure check valve; 321 - Second pressure check valve; 322 - Third pressure check valve; 330 - First flow restrictor cover; 331 - First water hole; 400 - Second RO component; 410 - Second RO; 420 - Second flow restrictor cover; 421 - Second water hole; 500 - Fourth pressure check valve. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0047] It should be noted that similar reference numerals and letters refer to like items throughout the accompanying drawings, and once an item is defined in one drawing, it is not necessary to further define and explain it in subsequent drawings.

[0048] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed during use, and are merely for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0049] In addition, the terms "horizontal", "vertical", "overhanging", and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0050] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] The following will be described in conjunction with the accompanying drawings Figures 1 to 8 Some embodiments of the present application will be described in detail. The following examples and features in the examples can be combined with each other without conflict. It should be noted that the arrowless lead-in label in the drawings represents a solid structure such as a barrel, and the hollow arrow lead-in label represents a virtual structure such as a hole, a channel, and a cavity.

[0052] Reference Figures 1 to 3 The embodiments of the present application disclose a composite filter element, which is applied to a water purifier or other equipment that needs to be purified, and the composite filter element comprises a barrel body 100 and a first RO assembly 200, a waterway switching assembly 300 and a second RO assembly 400 arranged in the barrel body 100 in sequence.

[0053] The barrel body 100 is provided with a water inlet hole 110, a pure water hole 120 and a concentrated water hole 130;

[0054] The water inlet side of the first RO component 200 is communicated with the water inlet hole 110, and the pure water output channel of the first RO component 200 is communicated with the pure water hole 120;

[0055] The pure water output channel of the first RO component 200 is communicated with the pure water output channel of the second RO component 400 in one direction through the fourth pressure one-way valve 500, and the communication direction is from the pure water output channel of the second RO component 400 to the pure water output channel of the first RO component 200, and the fourth pressure one-way valve 500 is opened when the positive water pressure is large and is closed when the positive water pressure is small;

[0056] The concentrated water outlet side of the second RO component 400 is communicated with the concentrated water hole 130;

[0057] The waterway switching component 300 has a first pressure channel 311, a second pressure channel 312 and a third pressure channel 313, the first pressure channel 311 is opened when the positive water pressure is small and is closed when the positive water pressure is large, and the second pressure channel 312 and the third pressure channel 313 are opened when the positive water pressure is large and are closed when the positive water pressure is small;

[0058] The water inlet end of the first pressure channel 311 is connected with the concentrated water outlet side of the first RO component 200, and the water outlet end is connected with the concentrated water hole 130;

[0059] The water inlet end of the second pressure channel 312 is communicated with the concentrated water outlet side of the first RO component 200;

[0060] The water inlet end of the third pressure channel 313 is communicated with the pure water hole 120;

[0061] The water outlet end of the second pressure channel 312 and the third pressure channel 313 are both connected with the water inlet side of the second RO component 400.

[0062] Thus, when the user needs to take water, the tap water under high pressure flows into the first RO assembly 200 from the water inlet hole 110 under the action of the booster pump for filtration and purification, the concentrated water impacts the first pressure channel 311 and the second pressure channel 312, so that the first pressure channel 311 is closed and the second pressure channel 312 is opened, and because the second pressure channel 312 and the third pressure channel 313 are communicated, the concentrated water will impact the third pressure channel 313 in the reverse direction to make the third pressure channel 313 closed, so that the pure water cannot pass through the third pressure channel 313, and the concentrated water enters the second RO assembly 400 through the third pressure channel 313 for purification and filtration again, and the amount of pure water is large to flush the fourth pressure check valve 500 to combine with the pure water generated by the first RO assembly 200, and then the pure water is discharged from the pure water hole 120, and the concentrated water is discharged from the concentrated water hole 130; and after the user finishes taking water, the booster pump stops or reduces power, the tap water enters the water inlet hole 110 at a low pressure for filtration and purification, the second pressure channel 312 is closed because of the small water pressure, the first pressure channel 311 is opened, the concentrated water is discharged from the concentrated water hole 130, and the pure water impacts the third pressure channel 313 to make it open, so that the pure water cannot be discharged from the pure water hole 120 and the filter element will enter the second RO assembly 400 for flushing, the concentrated water after flushing is discharged from the concentrated water hole 130, the amount of pure water generated by the second RO assembly 400 is small, so it cannot flush the fourth pressure check valve 500, so the pure water can be retained in the first RO assembly 200 and the second RO assembly 400, and the natural permeation effect will not occur, and the TDS of the retained pure water will not increase, so when the user needs to take water again, the pure water with low TDS can be directly connected, the purpose of reducing the TDS of the first cup of water is achieved, a water storage device does not need to be arranged, only the structure of the filter element needs to be modified, the size of the water purifier is reduced, and the manufacturing cost and the risk of water leakage of the whole machine are reduced.

[0063] It should be noted that the pure water hole 120 is generally connected to a faucet through a pipeline, the user opens the faucet when needing to take water, the pure water hole 120 is communicated with the atmosphere, so that the pure water can be discharged from the filter element; and when the user does not need to take water, the faucet is closed, and the pure water is retained in the pipeline and the filter element. The concentrated water hole 130 is generally communicated with the atmosphere through a pipeline, so that the concentrated water can be discharged under the action of the water pressure in the filter element.

[0064] In the embodiment, the volume of the second RO assembly 400 is greater than that of the first RO assembly 200, so that when the user restarts the machine to take water, the low-TDS pure water retained in the second RO assembly 400 during the water production process of the composite filter element can dilute the high-TDS pure water retained in the first RO assembly 400, and the purpose of reducing the TDS of the first cup of water is better achieved.

[0065] The structure of the barrel body 100 can adopt a hollow cylindrical shape in the prior art. The water inlet hole 110, the pure water hole 120, and the concentrated water hole 130 are all arranged at one end of the barrel body 100. The second RO assembly 400 is arranged farther away from the one end of the barrel body 100 where the water inlet hole 110, the pure water hole 120, and the concentrated water hole 130 are arranged, relative to the first RO assembly 200 and the water path switching assembly 300. The other end of the barrel body 100 is open to install the barrel cover 140 for closing. In this way, when assembling the composite filter element, the first RO assembly 200, the water path switching assembly 300, and the second RO assembly 400 can be assembled first, and then inserted from the open end of the barrel body 100. Finally, the barrel cover 140 is installed on the barrel body 100 to realize the closed condition in the barrel body 100.

[0066] In detail, the first RO assembly 200, the water path switching assembly 300, and the second RO assembly 400 together form the concentrated water cavity 150 with the inner wall of the barrel body 100, that is, the outer wall of the inner barrel 230, the outer wall of the water path switching module 310, and the outer wall of the second RO 410 together form the concentrated water cavity 150 with the inner wall of the barrel body 100. The concentrated water cavity 150 is in communication with the concentrated water hole 130. The first pressure channel 311 and the concentrated water outlet side of the second RO assembly 400 are both in communication with the concentrated water cavity 150. In this way, the concentrated water cavity 150 can guide the concentrated water generated by passing through the first RO assembly 200 and the second RO assembly 400 to the concentrated water hole 130 for discharge.

[0067] Reference Figure 3 and Figure 4 The first RO assembly 200 includes the inner barrel 230, the first RO 210, and the end cover 220 arranged in the inner barrel 230. The end cover 220 is fixed to the one end of the barrel body 100 where the water inlet hole 110, the pure water hole 120, and the concentrated water hole 130 are arranged. The water inlet end of the first RO 210 is clamped into the end cover 220 and is in communication with the water inlet hole 110. The concentrated water outlet end of the first RO 210 is fixed to the water path switching assembly 300 and is in communication with the first pressure channel 311 and the second pressure channel 312. The pure water output channel of the first RO 210 is unidirectionally communicated with the pure water output channel of the second RO assembly 400. One end of the inner barrel 230 is fixed to the barrel body 100, and the other end is fixed to the water path switching assembly 300. The inner wall of the barrel body 100 and the first RO 210 form the transition cavity 240. The transition cavity 240 is in communication with the pure water hole 120 and the third pressure channel 313. In this way, after tap water enters from the water inlet hole 110, the tap water is filtered by the first RO 210. The generated pure water is communicated to the pure water hole 120. If the user needs to draw water, the pure water is discharged from the pure water hole 120. If the user does not need to draw water, the pure water is communicated to the third pressure channel 313 from the transition cavity 240.

[0068] Reference Figure 3 and Figure 5The second RO assembly 400 comprises a second flow-limiting cover 420 and a second RO 410. The water inlet end of the second RO 410 is fixed to the water path switching assembly 300 and is in communication with the second pressure channel 312 and the third pressure channel 313. The pure water output channel of the second RO 410 is in one-way communication with the pure water output channel of the first RO assembly 200. The second flow-limiting cover 420 is sleeved on the concentrated water outlet end of the second RO 410. The second flow-limiting cover 420 is provided with a second water hole 421, which is in communication with the concentrated water hole 130, so as to control the overall pure water recovery rate and pressure release.

[0069] Reference Figure 3 and Figure 6 The water path switching assembly 300 comprises a water path switching module 310, a first pressure one-way valve 320, a second pressure one-way valve 321 and a third pressure one-way valve 322. The water path switching module 310 is connected with the first RO assembly 200 and the second RO assembly 400 respectively. The water path switching module 310 is formed with a first pressure channel 311, a second pressure channel 312 and a third pressure channel 313. The first pressure one-way valve 320 is arranged in the first pressure channel 311. The second pressure one-way valve 321 is arranged in the second pressure channel 312. The third pressure one-way valve 322 is arranged in the third pressure channel 313. The one-way opening or closing functions of the first pressure channel 311, the second pressure channel 312 and the third pressure channel 313 are realized through the first pressure one-way valve 320, the second pressure one-way valve 321 and the third pressure one-way valve 322 respectively. That is, the communication direction of the first pressure one-way valve 320 is from the water inlet end to the water outlet end of the first pressure channel 311. The communication direction of the second pressure one-way valve 321 is from the water inlet end to the water outlet end of the second pressure channel 312. The communication direction of the third pressure one-way valve 322 is from the water inlet end to the water outlet end of the third pressure channel 313.

[0070] It should be further explained that the opening and closing of the second pressure channel 312 and the third pressure channel 313 under the condition of large positive water pressure and small positive water pressure means that the second pressure one-way valve 321 and the third pressure one-way valve 322 are both opened under the condition of large positive water pressure and closed under the condition of small positive water pressure. Therefore, the second pressure one-way valve 321, the third pressure one-way valve 322 and the fourth pressure one-way valve 500 are all typical spring-loaded one-way valves. That is, when the positive water pressure (i.e. the direction from the inlet to the outlet) exceeds the preset pressure threshold, the pressure overcomes the elastic resistance of the internal spring and any possible back pressure. The sealing element (usually a disc or spherical part made of rubber or plastic) in the valve is pushed to one side or lifted, thereby opening the internal passage of the valve and allowing water to flow through the valve. When the positive water pressure is insufficient to overcome the elastic resistance of the spring, the spring will push the sealing element back to its original position, thereby closing the internal passage of the valve and preventing water flow.

[0071] The first pressure channel 311, which opens when the forward water pressure is small and closes when the forward water pressure is large, refers to the first pressure one-way valve 320, which opens when the forward water pressure is small and closes when the forward water pressure is large, that is, the first pressure one-way valve 320 is a reverse spring-loaded one-way valve, and the sealing element cannot completely overcome the elastic resistance of the spring when the forward water pressure is small, so that the sealing element leaves a gap between the valve seat under the reverse action of the spring, so that the internal channel of the valve is opened to allow water flow, and when the forward water pressure is large, the sealing element is pushed to overcome the elastic resistance of the spring and any back pressure that may exist, so that the sealing element tightly fits the valve seat, so that the internal channel of the valve is closed to prevent water flow.

[0072] The side of the water path switching module 310 facing the first RO 210 has a first connecting ring 315, and the concentrated water outlet end of the first RO 210 is clamped into the first connecting ring 315 to achieve the fixation of the first RO 210. The side of the water path switching module 310 facing the second RO 410 has a second connecting ring 316, and the water inlet end of the second RO 410 is clamped into the second connecting ring 316 to achieve the fixation of the second RO 410.

[0073] In order to realize the conduction of the second pressure channel 312 and the second pressure channel 312, the water path switching module 310 further has a bridging channel 314, the two ends of the bridging channel 314 are respectively connected with the second pressure channel 312 and the second pressure channel 312, and the communication positions are respectively located on the downstream side of the second pressure one-way valve 321 and the third pressure one-way valve 322.

[0074] The water path switching module 310 further includes a first flow limiting cover 330 arranged at the water outlet end of the first pressure channel 311, and the first flow limiting cover 330 is provided with a first water hole 331 to control the pure water recovery rate and pressure release of the first RO 210 in the flushing state.

[0075] The working principle of the composite filter element of the embodiment is as follows:

[0076] Reference Figure 7When the user opens the faucet, i.e. starts the water production process, the booster pump provides high-pressure water, and the tap water reaches the water inlet end of the first RO 210 through the water inlet hole 110. Since the provided pressure is high, the water inlet pressure impacts each pressure check valve, wherein the first pressure check valve 320 and the third pressure check valve 322 are closed under pressure, and the second pressure check valve 321 is opened. The first concentrated water of the first RO 210 enters the second RO 410, and after being filtered and concentrated by the second RO 410, the water is discharged through the second water hole 421 of the second flow limiting cover 420 since the second flow limiting cover 420 is in communication with the atmosphere, and the pressure of the subsequent water path is zero. Since the volume of the second RO 410 is greater than that of the first RO 210, the fourth pressure check valve 500 is opened under the positive pressure difference, and the pure water of the second RO 410 is combined with the pure water of the first RO 210 and discharged from the pure water hole 120.

[0077] Reference Figure 8 When the user closes the faucet, i.e. starts the flushing process, the booster pump provides low-pressure water, and the tap water reaches the water inlet end of the first RO 210 through the water inlet hole 110. Since the provided pressure is not high, the water inlet pressure impact is reduced, wherein the first pressure check valve 320 and the third pressure check valve 322 are opened due to insufficient pressure, and the second pressure check valve 321 is closed. Since the first flow limiting cover 330 is in communication with the atmosphere, the pressure of the subsequent water path is zero. Therefore, the concentrated water generated by the first RO 210 can enter the concentrated water chamber 150 through the first water hole 331 of the first flow limiting cover 330, and the pure water generated by the first RO 210 enters the transition chamber 240 due to the closing of the faucet, and then enters the water inlet end of the second RO 410 through the third pressure check valve 322. Since the pressure is small and the volume of the second RO 410 is large, the second RO 410 cannot generate enough pure water pressure to open the fourth pressure check valve 500, and the fourth pressure check valve 500 is in a closed state. At the same time, the pure water generated by the first RO 210 flushes the second RO 410 and is discharged through the second water hole 421 of the second flow limiting cover 420 to the concentrated water chamber 150, and then is combined with the concentrated water generated by the first RO 210 and discharged from the concentrated water hole 130.

[0078] In addition, the application also discloses a water purifier comprising the composite filter element of the above-mentioned embodiments, and thus has corresponding structures and advantages.

[0079] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A composite filter cartridge, characterized by, The barrel body (100) and the first RO assembly (200), the water path switching assembly (300) and the second RO assembly (400) arranged in the barrel body (100) in sequence are included. The barrel body (100) is provided with a water inlet hole (110), a pure water hole (120) and a concentrated water hole (130). The water inlet side of the first RO assembly (200) is communicated with the water inlet hole (110), and the pure water output channel of the first RO assembly (200) is communicated with the pure water hole (120). The pure water output channel of the first RO assembly (200) and the pure water output channel of the second RO assembly (400) are communicated in one direction through the fourth pressure check valve (500), the direction of communication is from the pure water output channel of the second RO assembly (400) to the pure water output channel of the first RO assembly (200), and the fourth pressure check valve (500) is opened when the positive water pressure is large and is closed when the positive water pressure is small. The concentrated water outlet side of the second RO assembly (400) is communicated with the concentrated water hole (130). The water path switching assembly (300) has a first pressure channel (311), a second pressure channel (312) and a third pressure channel (313), the first pressure channel (311) is opened when the positive water pressure is small and is closed when the positive water pressure is large, and the second pressure channel (312) and the third pressure channel (313) are opened when the positive water pressure is large and are closed when the positive water pressure is small. The water inlet end of the first pressure channel (311) is connected to the concentrated water outlet side of the first RO assembly (200), and the water outlet end is connected to the concentrated water hole (130). The water inlet end of the second pressure channel (312) is communicated with the concentrated water outlet side of the first RO assembly (200). The water inlet end of the third pressure channel (313) is communicated with the pure water hole (120). The water outlet end of the second pressure channel (312) and the third pressure channel (313) are connected to the water inlet side of the second RO assembly (400).

2. The composite filter cartridge of claim 1, wherein, The water path switching assembly (300) includes a water path switching module (310), a first pressure check valve (320), a second pressure check valve (321) and a third pressure check valve (322), the water path switching module (310) is connected to the first RO assembly (200) and the second RO assembly (400) respectively, the water path switching module (310) is formed with the first pressure channel (311), the second pressure channel (312) and the third pressure channel (313), the first pressure check valve (320) is arranged in the first pressure channel (311), the second pressure check valve (321) is arranged in the second pressure channel (312), and the third pressure check valve (322) is arranged in the third pressure channel (313).

3. The composite filter cartridge of claim 2, wherein, The waterway switching module (310) further has a bridge channel (314) with two ends communicated with the second pressure channel (312) and the second pressure channel (312) respectively, and the communication positions are located at the downstream sides of the second pressure one-way valve (321) and the third pressure one-way valve (322) respectively.

4. The composite filter cartridge of claim 2 wherein, The waterway switching module (310) further comprises a first flow limiting cover (330) arranged at the water outlet end of the first pressure channel (311), and the first flow limiting cover (330) is provided with a first water hole (331).

5. The composite filter element of claim 1, wherein, The first RO assembly (200) comprises an inner barrel (230), a first RO (210) and an end cover (220) located in the inner barrel (230). The end cover (220) is fixed to the barrel body (100). The water inlet end of the first RO (210) is clamped into the end cover (220) and communicated with the water inlet hole (110); the concentrated water outlet end of the first RO (210) is fixed to the waterway switching assembly (300) and communicated with the first pressure channel (311) and the second pressure channel (312); the pure water output channel of the first RO (210) is one-way communicated with the pure water output channel of the second RO assembly (400). One end of the inner barrel (230) is fixed to the barrel body (100), and the other end is fixed to the waterway switching assembly (300); a transition cavity (240) is formed between the inner wall of the barrel body (100) and the first RO (210), and the transition cavity (240) is communicated with the pure water hole (120) and the third pressure channel (313).

6. The composite filter cartridge of claim 5 wherein, The waterway switching assembly (300) has a first connecting ring (315) on the side facing the first RO (210), and the concentrated water outlet end of the first RO (210) is clamped into the first connecting ring (315).

7. The composite filter element of claim 1, wherein, The second RO assembly (400) comprises a second flow limiting cover (420) and a second RO (410). The water inlet end of the second RO (410) is fixed to the waterway switching assembly (300) and communicated with the second pressure channel (312) and the third pressure channel (313); the pure water output channel of the second RO (410) is one-way communicated with the pure water output channel of the first RO assembly (200). The second flow limiting cover (420) is sleeved on the concentrated water outlet end of the second RO (410), and the second flow limiting cover (420) is provided with a second water hole (421) communicated with the concentrated water hole (130).

8. The composite filter cartridge of claim 7, wherein, The waterway switching assembly (300) has a second connecting ring (316) on the side facing the second RO (410), and the water inlet end of the second RO (410) is clamped into the second connecting ring (316).

9. The composite filter element of claim 1, wherein, The first RO component (200), the water path switching component (300) and the second RO component (400) jointly form a concentrated water cavity (150) with the inner wall of the barrel body (100), the concentrated water cavity (150) is communicated with the concentrated water hole (130), the first pressure channel (311) and the concentrated water outlet side of the second RO component (400) are communicated with the concentrated water cavity (150); And / or, the volume of the second RO component (400) is greater than the volume of the first RO component (200).

10. A water purifier characterized by comprising: The composite filter cartridge of any one of claims 1-9.

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