Water purifier with flow controlled by single-side valve and four-side valve

Abstract

The water purifier comprises a cylinder body, a cover body arranged at an opening of the cylinder body and a filter element assembly arranged in the cylinder body, a pure water discharge hole penetrating to the outer side of the cover body is formed in the bottom of a pure water insertion cavity, and a waste water discharge hole is formed in the bottom of a waste water cavity. A raw water inlet hole penetrating to the outer side of the cover body is formed in the bottom of the raw water cavity, a water inlet connector of a driving valve cavity of the four-side valve is communicated with the pure water discharging hole, and a water outlet connector of the driving valve cavity of the four-side valve is connected with a pure water pipe of a faucet. A water outlet joint of a driven valve cavity of the four-way valve is communicated with the raw water inlet hole, and a water inlet joint of the driven valve cavity of the four-way valve is communicated with a raw water pipe. Complex raw water flow channels and pure water flow channels do not need to be arranged in the cover body, the structure of the cover body is simplified, and the cover body is easy to manufacture and assemble.

Description

Technical Field

[0001] The utility model belongs to the technical field of household water purifiers, in particular to a water purifier with single four-sided valve flow control. Background Art

[0002] Water is the source of life, and the quality of drinking water is closely linked to people's health. After years of promoting and popularizing knowledge about drinking water and health, people have gradually come to understand the impact of drinking water quality on human health and are placing greater emphasis on drinking water safety. This has created a promising market for water purifiers.

[0003] A cylindrical integrated water purifier is a water purifier that integrates all filter elements in a cylindrical shell. It uses a flow control base to automatically open and close the water channel. It does not require pipeline connections or electrical devices such as water pumps or solenoid valves. Therefore, it can achieve water production without electricity. It has a series of advantages such as ease of use, low power consumption, compact structure, and beautiful appearance. It is becoming an increasingly popular water purification product.

[0004] However, existing integrated cylindrical water purifiers all use flow channels in the base or top cover of the filter cartridge to control the automatic opening and closing of the water channel. To ensure the flow control function, the internal flow channel structure is complex, requiring the installation of complex structures of raw water flow channels, pure water flow channels, purified water flow channels, and wastewater flow channels. In addition, a first control valve is installed to control the opening and closing of the raw water flow channel based on the water pressure of the pure water flow channel, and a second control valve is installed to control the opening and closing of the raw water flow channel based on the water pressure of the purified water flow channel. These complex internal flow channel structures make the base or top cover difficult to manufacture and assemble. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a water purifier with a simple flow channel structure and a single four-sided valve-controlled flow, so as to overcome the shortcomings of the prior art.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A single four-sided valve-controlled flow water purifier, comprising a cylinder, a cover provided at the opening of the cylinder, and a filter element assembly provided in the cylinder, wherein the filter element assembly comprises a reverse osmosis filter element, the reverse osmosis filter element having a wastewater outlet end face and a pure water production pipe, the cover having a water cavity on the inner side facing the cylinder, the water cavity being divided into a pure water insertion cavity in the center, a wastewater cavity surrounding the pure water insertion cavity, and a raw water cavity surrounding the wastewater cavity, the pure water production pipe being inserted into the pure water insertion cavity, the wastewater outlet end face being connected to the wastewater cavity, and the bottom of the pure water insertion cavity being provided with a hole extending through the wastewater cavity. A pure water discharge hole is provided on the outside of the cover body, a waste water discharge hole is provided at the bottom of the waste water chamber, a raw water inlet hole is provided at the bottom of the raw water chamber which penetrates to the outside of the cover body, and also includes a four-sided valve provided on the outside of the cover body, the water inlet joint of the active valve chamber of the four-sided valve is connected to the pure water discharge hole, and a first check valve is provided between the two, the water outlet joint of the active valve chamber of the four-sided valve is used to connect the pure water pipe of the faucet, the water outlet joint of the passive valve chamber of the four-sided valve is connected to the raw water inlet hole, and the water inlet joint of the passive valve chamber of the four-sided valve is used to connect to the raw water pipe.

[0008] By adopting the above technical solution, the present invention directly provides a pure water discharge hole extending through the outside of the cover body at the bottom of the pure water insertion cavity, and provides a raw water inlet hole extending through the outside of the cover body at the bottom of the raw water cavity. Furthermore, by providing a four-sided valve on the outside of the cover body, the water inlet joint of the active valve cavity of the four-sided valve is connected to the pure water discharge hole, the water outlet joint of the active valve cavity of the four-sided valve is used to connect to the pure water pipe of the faucet, the water outlet joint of the passive valve cavity of the four-sided valve is connected to the raw water inlet hole, and the water inlet joint of the passive valve cavity of the four-sided valve is used to connect to tap water. In this way, the pure water pressure introduced into the active valve cavity of the four-sided valve can be used to control the on-off of the passive valve cavity of the four-sided valve, thereby controlling the on-off of the raw water. With such a structure, there is no need to provide complex raw water flow channels and pure water flow channels inside the cover body, which simplifies the structure of the cover body and makes the manufacture and assembly of the cover body simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a perspective view of Example 1;

[0010] Figure 2 This is a three-dimensional view of Example 1 with the cover removed;

[0011] Figure 3 This is a top view of Example 1 with the cover and faucet removed;

[0012] Figure 4 This is a schematic structural diagram of the top of the display cover in Example 1;

[0013] Figure 5 Schematic diagram of the structure of the water cavity of the display cover in Example 1;

[0014] Figure 6 for Figure 3 Middle AA section view;

[0015] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0016] Figure 8 for Figure 3 Middle BB section view;

[0017] Figure 9 for Figure 8 Enlarged view of point B in the middle;

[0018] Figure 10 is a perspective view of Example 2;

[0019] Figure 11 This is a three-dimensional view of Example 2 with the cover removed;

[0020] Figure 12 This is a perspective view of Example 2 with the cover and faucet removed;

[0021] Figure 13 A top view of Example 2 with the cover and faucet removed;

[0022] Figure 14 for Figure 13 Middle CC section view;

[0023] Figure 15 for Figure 14 Enlarged view of point C in the middle;

[0024] Figure 16 This is a three-dimensional view of Example 3 with the cover removed. DETAILED DESCRIPTION

[0025] Example 1

[0026] like Figure 1 、 Figure 2 、 Figure 3 as well as Figure 6 As shown, the single four-sided valve controlled flow water purifier of the present invention comprises a cover 10, a barrel 20, a filter element assembly 30, a four-sided valve 40, and a faucet 50. In this embodiment, the faucet 50 is a single-outlet faucet having a water outlet pipe 55, a pure water pipe 52, and a pure water valve 51 connected between the water outlet pipe 55 and the pure water pipe 52.

[0027] The cylinder 20 is a cylindrical, one-piece stainless steel housing with one closed end and the other open. In this embodiment, the bottom end of the cylinder 20 is closed and the top end is open. The cover 10, acting as a top cap, is installed over the top opening of the cylinder 20 with an O-ring seal and secured with a clamp 60. The filter element assembly 30 is mounted within the cylinder 20.

[0028] In some embodiments, the cylinder 20 may also be open at the bottom and closed at the top, and the cover 10 serves as a base and is installed at the bottom of the cylinder 20 .

[0029] Combine Figures 4 to 9 As shown, the cover 10 is made of plastic. A water chamber 110 is formed on the side of the cover 10 facing the barrel 20. The water chamber 110 is divided into a central pure water chamber 111, a waste water chamber 112 surrounding the pure water chamber 111, and a raw water chamber 113 surrounding the waste water chamber 112.

[0030] Among them, the bottom of the pure water insertion chamber 111 is provided with a pure water discharge hole 111a that penetrates to the outside of the cover body 10, the bottom of the waste water chamber 112 is provided with a waste water discharge hole 112a, and the bottom of the raw water chamber 113 is provided with a raw water inlet hole 113a that penetrates to the outside of the cover body 10.

[0031] The four-sided valve 40 is a valve that can be purchased directly on the market. The four-sided valve 40 has an active valve chamber and a passive valve chamber divided by an active valve diaphragm and a passive valve diaphragm. A piston is provided between the active valve diaphragm and the passive valve diaphragm, and both ends of the active valve chamber and the passive valve chamber have a water inlet connector and a water outlet connector, respectively. When the water pressure in the active valve chamber increases, it will compress the active valve diaphragm to drive the piston, and the piston will then compress the passive valve diaphragm to cut off the passive valve chamber and cut off the water supply. When the water pressure in the active valve chamber decreases, the water inlet pressure of the passive valve chamber will push open the passive valve diaphragm and the piston, making the passive valve chamber unobstructed and allowing water to pass through.

[0032] like Figure 2 and Figure 7 As shown, the water inlet connector of the active valve chamber of the four-sided valve 40 is connected to the pure water outlet hole 111a via a water pipe, with a first check valve 501 interposed therebetween. The water outlet connector of the active valve chamber of the four-sided valve 40 is connected to the pure water pipe 52 of the faucet 50. The water inlet connector of the passive valve chamber of the four-sided valve 40 is connected to the raw water pipe 41, and the water outlet connector of the passive valve chamber of the four-sided valve 40 is connected to the raw water inlet hole 113a via a water pipe. In some embodiments, the water inlet connector of the active valve chamber of the four-sided valve 40 is directly inserted into the pure water outlet hole 111a, and the water outlet connector of the passive valve chamber of the four-sided valve 40 is directly inserted into the raw water inlet hole 113a.

[0033] In this embodiment, the first check valve 501 is installed in the pure water outlet hole 111a. The first check valve 501 only allows pure water to flow from the pure water insertion cavity 111 to the outside of the cover body 10, but does not allow the pure water outside the cover body 10 to flow back to the pure water insertion cavity 111.

[0034] like Figure 2 and Figure 4As shown, the outer side of the cover body 10 has a cavity 120, and a cover 130 covers the mouth of the cavity 120, so that the four-sided valve 40 is hidden and placed in the space enclosed by the cavity 120 and the cover 130. The side of the cavity 130 has through holes 42 for the pure water pipe 52 and the raw water pipe 41 to pass through.

[0035] like Figure 6 and Figure 7 As shown, in this embodiment, a wastewater flow channel 114 communicating with the wastewater discharge hole 112a is provided inside the cover 10. The wastewater flow channel 114 extends horizontally from the wastewater discharge hole 112a to the side of the cover 10, forming a wastewater outlet 114a on the side.

[0036] like Figure 2 、 Figures 4 to 6 As shown, in this embodiment, a detection hole 113b is further provided at the bottom of the raw water chamber 113 and extends to the outside of the cover 10. A pressure sensor 43 is also provided on the outside of the cover 10 and plugged into the detection hole 113b.

[0037] In addition, if Figure 7 As shown, in this embodiment, a regulating valve mounting hole 115 is provided on the outside of the cover 10 at a position corresponding to the wastewater discharge hole 112a. A wastewater regulating valve core 116 is threadedly mounted within the regulating valve mounting hole 115 and extends into the wastewater discharge hole 112a. By turning the wastewater regulating valve core 116, the wastewater outlet gap between the wastewater regulating valve core 116 and the wastewater discharge hole 112a can be adjusted, thereby adjusting the wastewater flow rate into the wastewater flow channel 114 and thereby adjusting the wastewater ratio.

[0038] like Figure 1 As shown, in this embodiment, a hole 117 is provided on the cover 130 above the regulating valve mounting hole 115, and a hole cover 118 is provided on the hole 117. When it is necessary to turn the wastewater regulating valve core 116, the hole cover 118 is removed, and a corresponding valve core turning tool is inserted through the hole 117 into the wastewater regulating valve core 116 to turn the wastewater regulating valve core 116 to adjust the wastewater ratio.

[0039] In some embodiments, a wastewater flow channel may not be provided inside the cover body 10, and the wastewater discharge hole 112a is directly connected to the outside of the cover body 10. The wastewater discharge hole 112a is directly connected to a wastewater proportional regulating valve through a water pipe, and the wastewater proportional regulating valve is then connected to the sewer pipe through a wastewater pipe.

[0040] In addition, in this embodiment, the cover 130 is further provided with a hole 119 for exposing the display screen of the pressure sensor 43 .

[0041] like Figures 6 to 9As shown, the filter element assembly 30 includes a primary filter device 31 and a reverse osmosis filter element 32. The water-blocking convex ring 905 of the primary filter device 31 is inserted into the wastewater chamber 112, and a sealing ring is provided between the two. The primary filter device 31 is composed of a primary filter element 901, a lower end plate 902 and an upper end plate 903. Among them, the primary filter element 901 is a cylindrical structure with a central cavity 904 in the middle. The lower end plate 902 blocks the lower end face of the primary filter element 901 and the lower port of the central cavity 904. The upper end plate 903 blocks the upper end face of the primary filter element 901 and has a water-blocking convex ring 905 that is connected to the central cavity 904 and protrudes upward.

[0042] The reverse osmosis filter element 32 is located in the central cavity 904 of the primary filtration device 31. A water seal ring is wrapped around the circumference of its water production end 906 and is sealed with the water-isolating convex ring 905 of the primary filtration device 31. Its pure water production pipe 907 is inserted into the pure water insertion cavity 111. A sealing ring is sealed between the two, and the wastewater outlet end face 908 of the reverse osmosis filter element 32 is connected to the wastewater cavity 112.

[0043] A gap is formed between the circumference of the primary filter element 901 and the cylindrical body 20 to form a filter element water inlet portion 910. The raw water entering the raw water chamber 113 enters the filter element assembly 30 through the filter element water inlet portion 910 for filtration.

[0044] Both primary filter element 901 and reverse osmosis filter element 32 are conventional technologies. Primary filter element 901 is composed of PP cotton and carbon rods. The PP cotton removes sediment, oxidants, and suspended solids from the water, while the carbon rods remove chlorine and odors. Reverse osmosis filter element 32 further removes bacteria, viruses, and heavy metals from the water, ultimately producing pure water.

[0045] The above is the single four-sided valve flow control water purifier of the embodiment, and its working method is as follows:

[0046] When pure water is needed, open the pure water valve 51 of the faucet 50, and the water pressure in the active valve cavity of the four-sided valve 40 is reduced, so that the passive valve cavity is unblocked, and the raw water (i.e., tap water or other unfiltered water) enters the raw water cavity 113 from the raw water inlet hole 113a through the raw water pipe 41 and the passive valve cavity of the four-sided valve, and then enters the cylinder. The raw water entering the cartridge enters the primary filter element 901 from the side of the filter element water inlet 910, enters the central cavity 904 after primary filtration, and then enters the reverse osmosis filter element 32 from the lower end face (i.e., the water inlet end face) of the reverse osmosis filter element 32. After filtration, a part of it becomes pure water and enters the pure water production pipe 907, passes through the pure water insertion cavity 111 and the first check valve 501 in the pure water discharge hole 111a, enters the active valve cavity of the four-sided valve 40 from the water inlet joint of the active valve cavity of the four-sided valve 40, and then flows out from the water outlet joint of the active valve cavity of the four-sided valve 40 through the pure water pipe 52 and the pure water valve 51, and finally flows out from the water outlet pipe 55 of the faucet; the other part becomes waste water and is discharged from the upper end face (i.e., the wastewater outlet end face) of the reverse osmosis filter element 32 into the wastewater cavity 112, and is discharged to the sewer through the wastewater discharge hole 112a, the wastewater flow channel 114, and the wastewater outlet 114a.

[0047] When pure water is not needed, close the pure water valve 51 of the faucet 50. As pure water enters, the pure water pressure in the active valve chamber of the four-sided valve 40 increases. The high-pressure pure water in the active valve chamber of the four-sided valve 40 presses the active valve diaphragm to drive the piston, and the piston then presses the passive valve diaphragm to cut off the passive valve chamber to cut off the water, thereby preventing raw water from entering the cylinder and stopping the production of pure water.

[0048] Example 2

[0049] The difference between this embodiment and embodiment 1 is that the water purifier of this embodiment can produce both pure water and purified water, and has a dual water outlet function.

[0050] Therefore, the structural differences between this embodiment and embodiment 1 are as follows: Figures 10 to 15 As shown, a clean water outlet hole 112b is provided at the bottom of the waste water chamber 112, and a first three-way connection 61 and a second three-way connection 62 are provided in the cavity outside the cover 10. The faucet adopts a double-outlet faucet. In addition to the pure water valve 51, pure water pipe 52, and water outlet pipe 55, it also has a clean water valve 53 and a clean water pipe 54 connected to the clean water valve 53. The clean water valve 53 is also connected to the water outlet pipe 55.

[0051] The purified water outlet 112b is connected to one opening of the first tee 61 via a water pipe. The other two openings of the first tee 61 are connected to the purified water pipe 54 of the faucet 50, and the other is connected to a through-hole of the second tee 62 via a third check valve 63. The other two openings of the second tee 62 are connected to the purified water pipe 52 of the faucet 50, and the other is connected to the outlet joint of the active valve chamber of the four-sided valve 40. The third check valve 63 only allows purified water to flow from the second tee 62 to the first tee 61, but prevents purified water from flowing from the first tee 61 to the second tee 62, thus preventing the purified water from flowing out of the active valve chamber of the four-sided valve 40 from being contaminated by the purified water. The side of the cavity 120 also has a through-hole for the purified water pipe 54 to pass through.

[0052] The other structures are the same as those in Example 1.

[0053] The working mode of the water purifier with single four-sided valve control flow in this embodiment is as follows:

[0054] When both the pure water valve 51 and the purified water valve 53 of the faucet 50 are closed, raw water (i.e., tap water or other unfiltered water) initially flows through the raw water pipe, the passive valve chamber of the four-sided valve, and the raw water inlet hole 113a into the raw water chamber 113, and then into the cylinder. Since both the pure water valve 51 and the purified water valve 53 are closed, the pressure of the pure water produced by the filter element assembly increases within the active valve chamber of the four-sided valve 40. The high-pressure pure water within the active valve chamber of the four-sided valve 40 presses the active valve diaphragm to drive the piston, which in turn presses the passive valve diaphragm to cut off the passive valve chamber, thus preventing the raw water from entering the cylinder. Neither pure water nor purified water can be produced.

[0055] When pure water is needed, the pure water valve 51 in the faucet 50 is opened (the water purification valve 53 is closed at this time), and the pure water pressure in the active valve chamber of the four-sided valve is reduced, which will restore the smooth flow of the passive valve chamber, allowing raw water to enter the cylinder to realize the function of producing pure water. The wastewater generated in the pure water production process is discharged to the sewer through the wastewater chamber 112, the wastewater discharge hole 112a, the wastewater flow channel 114, and the wastewater outlet 114a. When the pure water valve 51 is closed again, the pure water pressure in the active valve chamber of the four-sided valve 40 will increase again, and the high-pressure pure water in the active valve chamber of the four-sided valve 40 will resume to press the active valve diaphragm to drive the piston. The piston then presses the passive valve diaphragm to cut off the passive valve chamber to cut off the water supply, preventing raw water from entering the cylinder and stopping the production of pure water.

[0056] When purified water is needed, the clean water valve 53 in the faucet 50 is opened (the pure water valve 51 is closed at this time). At this time, since the clean water valve 53 is connected to the active valve cavity of the four-sided valve, the pure water in the active valve cavity will flow out through the clean water valve 53, causing the pure water pressure in the active valve cavity to decrease, and also restoring the smooth flow of the passive valve cavity, allowing the raw water to enter the cylinder to achieve the function of producing purified water. At this time, since the clean water discharge hole 112b to the clean water valve 53 is unobstructed and has low resistance, while the permeation resistance of the reverse osmosis membrane is large, the water filtered by the primary filter element enters the reverse osmosis filter element 32 and cannot flow into the water production pipe through the filtration of the reverse osmosis membrane. Instead, it flows directly through the gap on the surface of the reverse osmosis membrane to the wastewater outlet end face 908, and is discharged from the clean water discharge hole 112b to the clean water valve 53, and finally, purified water is obtained directly from the faucet 50. Because the wastewater discharge hole 112a contains a wastewater regulating valve core, which has a high resistance to water, even if some wastewater is discharged from the wastewater discharge hole 112a into the wastewater pipe, it is extremely small. When the water purification valve 53 is closed, the pure water pressure in the active valve chamber of the four-sided valve 40 will also increase again. The high-pressure pure water in the active valve chamber of the four-sided valve 40 will resume its pressure on the active valve diaphragm to drive the piston. The piston then presses the passive valve diaphragm to cut off the passive valve chamber, thus cutting off the water supply, preventing raw water from entering the cylinder and stopping the production of purified water.

[0057] Example 3

[0058] like Figure 16 As shown, this embodiment differs from Example 2 in that a third three-way connection 65 is added to the pure water pipe 52, connecting it to a pressure water storage tank (not shown) to connect the pressure water storage tank to the active valve chamber of the four-sided valve 40. A second check valve 64 is also added between the two. Specifically, a second check valve 64 is added to the pure water pipe between the third three-way connection 65 and the water outlet connection of the active valve chamber of the four-sided valve 40. This second check valve 64 only allows pure water in the active valve chamber of the four-sided valve 40 to flow toward the pressure water storage tank and the faucet, but prevents pure water in the pressure water storage tank from flowing back toward the active valve chamber of the four-sided valve 40. The remaining structure is the same as that of Example 2.

[0059] This embodiment can store the produced pure water in a pressure water storage barrel. When both the pure water valve 51 and the clean water valve 52 are closed, once the pressure water storage barrel is full of pure water, the water pressure in the active valve chamber of the four-sided valve 40 increases, which in turn controls the passive valve chamber of the four-sided valve 40 to be closed, preventing raw water from entering the barrel and stopping pure water production. Conversely, if the pure water in the pressure water storage barrel is consumed, the water pressure in the active valve chamber of the four-sided valve 40 decreases, controlling the passive valve chamber of the four-sided valve 40 to be unblocked, allowing raw water to enter the barrel and resuming pure water production until the pressure water storage barrel is full of pure water.

Claims

1. A single four-sided valve-controlled flow water purifier, comprising a barrel, a cover disposed at an opening of the barrel, and a filter element assembly disposed within the barrel, the filter element assembly comprising a reverse osmosis filter element having a wastewater outlet end face and a pure water production pipe, the cover having a water cavity on the inner side facing the barrel, the water cavity being divided into a pure water insertion cavity in the center, a wastewater cavity surrounding the pure water insertion cavity, and a raw water cavity surrounding the wastewater cavity, the pure water production pipe being inserted into the pure water insertion cavity, the wastewater outlet end face being connected to the wastewater cavity, and the characteristics: The bottom of the pure water insertion cavity is provided with a pure water discharge hole that penetrates to the outside of the cover body, the bottom of the waste water cavity is provided with a waste water discharge hole, and the bottom of the raw water cavity is provided with a raw water inlet hole that penetrates to the outside of the cover body. It also includes a four-sided valve arranged on the outside of the cover body, the water inlet joint of the active valve cavity of the four-sided valve is connected to the pure water discharge hole, and a first check valve is provided between the two, the water outlet joint of the active valve cavity of the four-sided valve is used to connect to the pure water pipe of the faucet, the water outlet joint of the passive valve cavity of the four-sided valve is connected to the raw water inlet hole, and the water inlet joint of the passive valve cavity of the four-sided valve is used to connect to the raw water pipe.

2. The single four-sided valve-controlled water purifier according to claim 1, characterized in that: The cover body has a wastewater flow channel extending from the wastewater discharge hole to the peripheral surface of the cover body.

3. The single four-sided valve-controlled water purifier according to claim 2, characterized in that: A regulating valve mounting hole is provided on the outer side of the cover body at a position corresponding to the wastewater discharge hole, and a wastewater regulating valve core is installed in the regulating valve mounting hole and extends into the wastewater discharge hole.

4. The single four-sided valve-controlled water purifier according to claim 1, characterized in that: The wastewater discharge hole directly penetrates to the outer side of the cover body, and a wastewater proportional valve is connected to the wastewater discharge hole.

5. The single four-sided valve-controlled water purifier according to claim 1, characterized in that: The bottom of the raw water chamber is further provided with a detection hole which penetrates to the outside of the cover body, and the outside of the cover body is further provided with a pressure sensor which is plugged into the detection hole.

6. The single four-sided valve-controlled water purifier according to claim 1, characterized in that: The active valve cavity of the four-sided valve is also connected to the water storage tank, and a second check valve is provided between the two.

7. The water purifier with single four-sided valve flow control according to any one of claims 1 to 6, characterized in that: The bottom of the waste water cavity has a clean water discharge hole that penetrates to the outside of the cover body. The clean water discharge hole is used to connect to the clean water pipe of the faucet and also connect to the active valve cavity of the four-sided valve through the third check valve.

8. The single four-sided valve-controlled water purifier according to claim 7, characterized in that: The outer side of the cover body is provided with a cavity, the mouth of the cavity is covered with a cover, and the four-sided valve is hidden in a space enclosed by the cavity and the cover.

9. The single four-sided valve-controlled water purifier according to claim 8, characterized in that: The side portions of the cavity are provided with through holes for the water pipes to pass through.

10. The single four-sided valve-controlled water purifier according to claim 1, characterized in that: The filter element assembly further includes a primary filter element, and the reverse osmosis filter element is located in the central cavity of the primary filter element.

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