CN215208773U - Steady flow water purifier - Google Patents

Abstract

The present disclosure relates to a steady flow water purification device. The steady flow water purifier at least comprises a preposed water drive composite filter element integrated with a preposed filter element and a water drive tank, a reverse osmosis filter element, a water inlet passage, a water purification passage, a pure water passage, a reflux passage and a steady flow passage; one end of the backflow passage is connected with a water inlet and a water outlet of a water drive tank of the preposed water drive composite filter element, the other end of the backflow passage is connected between a first electromagnetic valve and a booster pump which are arranged on the water purification passage, and a second electromagnetic valve and a second check valve are arranged; one end of the steady flow passage is connected between the first check valve and the pressure release valve, and the other end of the steady flow passage is a steady flow water outlet of the steady flow water purifier; the steady flow passage is provided with a flow regulating valve. The utility model provides a stationary flow route can carry out the stationary flow output to the pure water of reverse osmosis filter core output, and when the flow of the pure water of reverse osmosis filter core output was great, the pure water route can transmit unnecessary pure water to the storage of water drive jar, and the backward flow route can also be inputed the pure water that this water drive jar can't be stored to the reverse osmosis filter core, realizes the closed loop backward flow.

Description

Steady flow water purifier

Technical Field

The disclosure relates to the technical field of water purification control, in particular to a steady flow water purification device.

Background

In order to improve the quality of drinking water, more and more households are equipped with water purification devices by which tap water or water directly supplied from a water source can be treated to be purified water for use.

In the related art, the flow of the pure water output by the steady-flow water purifier is related to the pressure of the tap water, and the pressure of the tap water is often not constant, so that the flow of the pure water of the steady-flow water purifier is unstable, and the experience of a user in water taking is influenced.

SUMMERY OF THE UTILITY MODEL

To overcome the problems in the related art, the embodiments of the present disclosure provide a steady flow water purification device. The technical scheme is as follows:

according to a first aspect of the embodiments of the present disclosure, there is provided a steady flow water purification device, the steady flow water purification device at least comprising a pre-water-drive composite filter element integrated with a pre-filter element and a water-drive tank, a reverse osmosis filter element, a water inlet passage, a water purification passage, a pure water passage, a return passage, and a steady flow passage;

the preposed water drive composite filter element is provided with a raw water inlet, a purified water outlet and a water inlet and outlet of the water drive tank; the reverse osmosis filter element is at least provided with a purified water inlet and a purified water outlet;

one end of the water inlet passage is connected with a raw water inlet of the preposed water drive composite filter element, and the other end of the water inlet passage is connected with an external water source and used for providing raw water to be purified for the steady flow water purifying device;

one end of the water purification passage is connected with the water purification water outlet of the preposed water drive composite filter element, the other end of the water purification passage is connected with the water purification water inlet of the reverse osmosis filter element, and the water purification passage is provided with a first electromagnetic valve and a booster pump;

one end of the pure water passage is connected with a pure water outlet of the reverse osmosis filter element, and the other end of the pure water passage is connected with a water inlet and a water outlet of a water drive tank of the preposed water drive composite filter element; the pure water passage is provided with a first check valve, a pressure relief valve and a high-pressure switch; the forward directions of the first check valve and the pressure release valve are both the directions from the pure water outlet to the water inlet and outlet of the water drive tank; the high-voltage switch is used for being closed when the pressure on the side of the preposed water-drive composite filter element is greater than a preset threshold value and being opened when the pressure on the side of the preposed water-drive composite filter element is less than or equal to the preset threshold value;

one end of the backflow passage is connected with a water inlet and a water outlet of a water drive tank of the preposed water drive composite filter element, and the other end of the backflow passage is connected between the first electromagnetic valve arranged on the water purification passage and the booster pump; the backflow passage is provided with a second electromagnetic valve and a second check valve; the forward direction of the second check valve is the direction from the water inlet and outlet of the water drive tank to the booster pump;

one end of the steady flow passage is connected between the first check valve and the pressure release valve, and the other end of the steady flow passage is a steady flow water outlet of the steady flow water purifying device; the flow stabilizing passage is provided with a flow regulating valve.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: the stationary flow route can carry out the stationary flow output to the pure water of reverse osmosis filter core output, and simultaneously when the flow of the pure water of reverse osmosis filter core output is great, the pure water route can transmit unnecessary pure water to the storage of water drive jar, and when water drive jar had been held full of pure water, this backward flow route can also be inputed the pure water that this water drive jar can't be saved to the reverse osmosis filter core once more, realizes the closed loop backward flow, avoids the pure water extravagant.

In one embodiment, the steady flow path is further provided with a heating member disposed between the flow regulating valve and the steady flow water outlet.

In one embodiment, the steady flow path is further provided with a third solenoid valve, and the third solenoid valve is arranged between the flow regulating valve and the heating member.

In one embodiment, the water drive tank water inlet and outlet comprises an opening;

or, the water drive tank water inlet and outlet comprises a water drive tank water inlet and a water drive tank water outlet, correspondingly, the pure water passage is connected with the water drive tank water inlet in the water drive tank water inlet and outlet, and the backflow passage is connected with the water drive tank water outlet in the water drive tank water inlet and outlet.

In one embodiment, the steady flow water purification unit further comprises a cold water pathway;

one end of the cold water passage is connected between the first check valve and the pressure release valve, and the other end of the cold water passage is a cold water outlet of the steady-flow water purification device; the cold water passage is provided with a fourth electromagnetic valve.

In one embodiment, a flow meter is further disposed between the flow regulating valve and the first check valve.

In one embodiment, the water inlet passage is connected with a tap water pipeline and is provided with a pressure reducing valve.

In one embodiment, the constant flow water purification unit further comprises a waste water pathway; the reverse osmosis filter element is also provided with a wastewater outlet;

one end of the wastewater passage is a wastewater outlet of the steady flow water purifier, and the other end of the wastewater passage is connected with a wastewater outlet of the reverse osmosis filter element.

In one embodiment, the waste water pathway is provided with at least two concentrate solenoid valves having different waste water ratios.

In one embodiment, a post-filter element is integrated within the reverse osmosis filter element.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a schematic structural view illustrating a steady flow water purification device according to an exemplary embodiment.

Fig. 2 is a schematic structural view illustrating a steady flow water purification device according to an exemplary embodiment.

Fig. 3 is a schematic structural view illustrating a steady flow water purification device according to an exemplary embodiment.

Fig. 4 is a schematic structural view illustrating a steady flow water purification device according to an exemplary embodiment.

Fig. 5 is a schematic structural view illustrating a steady flow water purification device according to an exemplary embodiment.

Fig. 6 is a schematic structural view illustrating a steady flow water purification device according to an exemplary embodiment.

Fig. 7 is a schematic structural view illustrating a steady flow water purification device according to an exemplary embodiment.

Fig. 8 is a schematic structural view illustrating a steady flow water purification device according to an exemplary embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

The present disclosure provides a steady flow water purification device 10, as shown in fig. 1, the steady flow water purification device 10 at least includes a front water-driving composite filter element 20 integrated with a front filter element and a water-driving tank, a reverse osmosis filter element 30, a water inlet passage 40, a water purification passage 50, a pure water passage 60, a return passage 70, and a steady flow passage 80.

Wherein, the prepositive water drive composite filter element 20 is provided with a raw water inlet a, a purified water outlet b and a water inlet and outlet c of a water drive tank; the reverse osmosis filter element 30 is at least provided with a purified water inlet d and a purified water outlet e.

One end of the water inlet passage 40 is connected to the raw water inlet a of the front water-driving composite filter element 20, and the other end is connected to an external water source, and is used for providing raw water to be purified for the steady-flow water purifying device.

One end of the purified water passage 50 is connected with the purified water outlet b of the front water-drive composite filter element 20, the other end is connected with the purified water inlet d of the reverse osmosis filter element 30, and the purified water passage 50 is provided with a first electromagnetic valve 501 and a booster pump 502.

One end of the pure water passage 60 is connected with a pure water outlet e of the reverse osmosis filter element 30, and the other end is connected with a water inlet and outlet c of a water drive tank of the preposed water drive composite filter element 20; the pure water passage 60 is provided with a first check valve 601, a pressure relief valve 602 and a high-pressure switch 603; the forward directions of the first check valve 601 and the pressure relief valve 602 are both the directions from the pure water outlet e to the water inlet and outlet c of the water drive tank, and the forward directions are the directions in which the first check valve 601 and the pressure relief valve 602 allow water to flow; the high-pressure switch 603 is configured to be turned off when the pressure on the side of the front water-drive composite filter element 20 is greater than a preset threshold value, and turned on when the pressure on the side of the front water-drive composite filter element 20 is less than or equal to the preset threshold value.

One end of the return passage 70 is connected with a water inlet and outlet c of the water drive tank of the front water drive composite filter element 20, and the other end is connected between a first electromagnetic valve 501 and a booster pump 502 arranged on the water purification passage 50; the return passage 70 is provided with a second solenoid valve 701 and a second check valve 702, the forward direction of the second check valve 702 is the direction from the water drive tank inlet/outlet port c to the booster pump 502, and the forward direction is the direction in which the second check valve 702 allows the water flow.

One end of the steady flow passage 80 is connected between the first check valve 601 and the pressure release valve 602, and the other end is a steady flow water outlet 1 of the steady flow water purifier 10; the flow stabilizing passage 80 is provided with a flow regulating valve 801.

For example, the steady flow water purifier 10 shown in fig. 1 has at least three modes of operation: a water making mode, a steady flow mode and a reflux mode.

When this stationary flow purifier 10 work is during the mode of making water, first solenoid valve 501 and booster pump 502 open, at this moment, the raw water that outside water source is not purified gets into inhalant canal 40, and get into the raw water inlet a of leading water drive composite filter element 20 through this inhalant canal 40, after the filtration of this leading water drive composite filter element 20 filters the large granule impurity and some coloured impurity in aquatic, export from the water purification delivery port b of this leading water drive composite filter element 20, avoid the impurity damage rearmounted first solenoid valve 501 of former aquatic, devices such as booster pump 502 and reverse osmosis filter element 30, thereby effectively improve this stationary flow purifier 10's life. Because the first electromagnetic valve 501 and the booster pump 502 are opened, the purified water flowing out from the purified water outlet b of the pre-water-driven composite filter element 20 enters the reverse osmosis filter element 30 through the purified water inlet d of the reverse osmosis filter element 30 for filtration after being boosted by the booster pump 502. The pure water generated after being filtered by the reverse osmosis filter element 30 flows out from the pure water outlet e of the reverse osmosis filter element 30, and flows into the water drive tank integrated in the front water drive composite filter element 20 from the water drive tank inlet/outlet c of the front water drive composite filter element 20 through the pure water passage 60 to be stored.

When the steady flow water purifier 10 works in the steady flow mode, the first electromagnetic valve 501, the booster pump 502 and the flow regulating valve 801 are opened, the steady flow water purifier 10 produces water according to the above mode, and since the flow regulating valve 801 is opened, pure water flowing out of the pure water outlet e of the reverse osmosis filter element 30 can be output from the steady flow water outlet 1 through the flow regulating valve 801, so that a user can conveniently take and use the pure water. Specifically, the operation flow rate of the flow rate adjustment valve 801 may be set in advance according to the flow rate required by the user. The flow regulating valve 801 can automatically eliminate the flow deviation caused by the pressure fluctuation of the pure water in the steady flow passage 80, namely, the output flow of the steady flow passage 80 is kept at the working flow of the flow regulating valve 801 no matter how the pressure of the pure water flowing out from the pure water outlet e of the reverse osmosis filter element 30 changes, and the hydraulic imbalance of the steady flow passage 80 is effectively solved. In order to prevent the pure water introduced into the steady flow path 80 from flowing back to the reverse osmosis filter element 30, one end of the steady flow path 80 may be connected between a first check valve 601 provided in the pure water path 60 and the relief valve 602, and the flow direction of the pure water from the reverse osmosis filter element 30 to the steady flow path 80 may be restricted by the first check valve 601.

When the steady flow water purifier 10 works in the backflow mode, the first electromagnetic valve 501, the booster pump 502, the flow regulating valve 801 and the second electromagnetic valve 701 are opened, the steady flow water purifier 10 produces water according to the steady flow mode, and since the working flow of the flow regulating valve 801 is set as required, the flow of pure water obtained by filtering by the reverse osmosis filter element 30 may change with the pressure of an external water source, and therefore, the situation that the pressure of the flow regulating valve 801 near the reverse osmosis filter element 30 is too high may occur. When the pressure of the flow control valve 801 on the side close to the reverse osmosis filter element 30 is greater than the threshold value of the pressure release valve 602, the pressure release valve 602 is opened, and the excess pure water flows into the water drive tank through the pure water passage 60 to be stored. However, the water drive tank has a limited capacity, and if pure water is fully stored in the water drive tank, the pressure of the high-pressure switch 603 near the side of the front water drive composite filter element 20 is high, and when the pressure is higher than the threshold value of the high-pressure switch 603, the high-pressure switch 603 is closed, that is, pure water in the pure water passage 60 is suspended from entering the water drive tank. Because the second electromagnetic valve 701 is opened, the pure water stored in the water drive tank is input to the front of the booster pump 502 through the backflow passage 70, and then enters the reverse osmosis filter element 30 again after being boosted by the booster pump 502 for filtration, so that closed-loop backflow is formed, and the waste of the pure water is avoided. When the pressure of the high-pressure switch 603 near the side of the front water-driving composite filter element 20 is reduced along with the reduction of the pure water amount in the water-driving tank in the backflow process, and the pressure is smaller than or equal to the threshold value of the high-pressure switch 603, the high-pressure switch 603 is opened, and the pure water which cannot be output through the flow stabilizing passage 80 in the pure water passage 60 can continuously flow into the water-driving tank for storage.

In the technical scheme provided by the embodiment of the present disclosure, the steady flow path 80 can carry out steady flow output to the pure water output by the reverse osmosis filter element 30, and simultaneously when the flow of the pure water output by the reverse osmosis filter element 30 is great, the pure water path 60 can transmit the redundant pure water to the water drive tank for storage, and when the water drive tank is full of pure water, the backflow path 70 can also input the pure water which cannot be stored in the water drive tank to the reverse osmosis filter element 30 again, thereby realizing closed loop backflow and avoiding pure water waste.

In one embodiment, as shown in fig. 2, the steady flow path 80 is further provided with a heating member 802, and the heating member 802 is provided between the flow regulating valve 801 and the steady flow water outlet 1.

For example, the heating element 802 may heat pure water output from the steady flow path 80, for example, to a preset temperature set by a user. Specifically, the heating element 802 heats pure water at a constant power at a temperature related to the operating flow rate of the flow regulating valve 801. If the working flow of the flow regulating valve 801 is large, that is, the flow of the pure water in the steady flow passage 80 is large, the temperature after being heated by the heating element 802 is low; if the working flow of the flow regulating valve 801 is small, that is, the flow of pure water in the steady flow passage 80 is small, the temperature after being heated by the heating element 802 is high. Therefore, the working flow of the flow regulating valve 801 and the heating power of the heating element 802 can be set through the target temperature set by the user, the outlet water temperature of the stable water outlet 1 is accurately controlled to be the target temperature, and the user experience is improved.

In one embodiment, as shown in fig. 3, the steady flow path 80 is further provided with a third solenoid valve 803, and the third solenoid valve 803 is provided between the flow regulating valve 801 and the heating member 802.

Illustratively, the third solenoid valve 803 is a normally closed solenoid valve that is opened when the steady flow water purifier 10 is operating in the steady flow mode and the backflow mode. The third electromagnetic valve 803 can better lock water, and the situation that the stable water outlet 1 drips when the length of the stable water channel 80 is long is avoided.

In one embodiment, as shown in fig. 1 to 3, the water drive tank inlet/outlet port c may include an opening to which the pure water passage 60 and the return passage 70 are connected, the opening being the water inlet port when the pure water passage 60 inputs pure water into the water drive tank; the opening is a water outlet when pure water in the water drive tank is fully returned from the return passage 70. In practical application, this water drive tank outlet/inlet port c may further include two openings, namely a water drive tank water inlet and a water drive tank water outlet, and correspondingly, the pure water passage 60 connects the water drive tank water inlet in the water drive tank outlet/inlet port c, and the backflow passage 70 connects the water drive tank water outlet in the water drive tank outlet/inlet port c.

In one embodiment, as shown in FIG. 4, the constant flow water purifier 10 further includes a cold water pathway 90; one end of the cold water passage 90 is connected between the first check valve 601 and the pressure release valve 602, and the other end is a cold water outlet 2 of the steady flow water purifier 10; the cold water passage 90 is provided with a fourth solenoid valve 901.

For example, the steady flow water purifier 10 may further include a water intake mode, when the water intake mode is operated, the first solenoid valve 501, the booster pump 502 and the fourth solenoid valve 901 are opened, and the flow regulating valve 801 and the second solenoid valve 701 are closed. The steady flow water purifier 10 produces water according to the water production mode, and the fourth electromagnetic valve 901 is opened, so that the pure water flowing out of the pure water outlet e of the reverse osmosis filter element 30 can be output from the cold water outlet 2 through the fourth electromagnetic valve 901, and is convenient for a user to take.

In one embodiment, as shown in fig. 5, a flow meter 902 is further disposed between the flow regulating valve 801 and the first check valve 601.

Illustratively, the flow meter 902 is used to measure the flow rate of pure water flowing out of the pure water outlet e of the reverse osmosis filter element 30. The steady flow water purifying device 10 can obtain a target flow set by a user through a human-computer interaction interface in advance, and in the working process, the working power of the flow regulating valve 801 can be adjusted according to the detection result of the flow meter 902 and the target flow, so that the water flow output by the steady flow passage 80 is the same as the target flow.

Or, the flowing water purifying device 10 may obtain a target temperature set by a user through a human-computer interface in advance, and during the working process, the working flow of the flow regulating valve 801 may be adjusted according to the detection result of the flow meter 902, the heating power of the heating element 802 and the target temperature, so that the temperature of the pure water output by the steady flow path 80 reaches the target temperature.

In one embodiment, as shown in fig. 6, the water inlet passage 40 is connected to a tap water line and is provided with a pressure reducing valve 401.

Illustratively, the pressure reducing valve 401 is used to stabilize the water pressure of the tap water, so that the pressure of the tap water flowing from the water inlet passage 40 to the pre-water-driven composite filter element 20 is constant, thereby avoiding the problem that the water pressure of the tap water is too high, which affects the operation of the water-driven tank integrated in the pre-water-driven composite filter element 20, and avoids the problem that the back pressure is too high, which affects the water production efficiency, in the process that the water-driven tank is full of water.

In one embodiment, as shown in FIG. 7, the constant flow water purifier 10 further includes a wastewater pathway 100; the reverse osmosis filter element 30 is also provided with a waste water outlet f.

Wherein, one end of the waste water passage 100 is the waste water outlet 3 of the steady flow water purifier 10, and the other end is connected with the waste water outlet f of the reverse osmosis filter element 30.

Illustratively, the steady flow water purifier 10 further comprises a bubble film mode, when the steady flow water purifier 10 operates in the bubble film mode, the booster pump 502 and the second solenoid valve 701 are opened, and the first solenoid valve 501, the flow regulating valve 801, the third solenoid valve 803 and the fourth solenoid valve 901 are all closed. Pure water stored in the integrated water drive tank in the front water drive composite filter element 20 is transmitted to the booster pump 502 through the return water passage 70, and then is conveyed to the concentrated water side of the reverse osmosis filter element 30 through the booster pump 502, the concentrated water of high TDS (Total dispersed solids) after the normal water production of the concentrated water side is replaced, the problem of high TDS (Total dispersed solids) of the concentrated water permeating to the pure water side when the flow stabilizing and water purifying device 10 does not work is avoided, and then the problem of high TDS of the first cup of water after the flow stabilizing and water purifying device 10 is static for a period of time is avoided, and the user experience is improved.

Alternatively, referring to fig. 7, the wastewater pathway 100 is provided with a concentrate solenoid valve 1001, and the concentrate solenoid valve 1001 is provided with a wastewater ratio. When the concentrate solenoid valve 1001 is closed, the wastewater pathway 100 discharges wastewater in accordance with a wastewater ratio actually generated by the reverse osmosis cartridge 30. When the concentrate solenoid valve 1001 is opened, the waste water passage 100 discharges waste water in accordance with the waste water ratio of the concentrate solenoid valve 1001.

For example, as shown in fig. 8, the waste water passage 100 may be provided with two concentrate solenoid valves 1001, a concentrate solenoid valve 1001a and a concentrate solenoid valve 1001b, having different waste water ratios. Assuming that the wastewater ratio of the concentrate solenoid valve 1001a is 1:2 and the wastewater ratio of the concentrate solenoid valve 1001b is 1:3, when the concentrate solenoid valve 1001a and the concentrate solenoid valve 1001b are both closed, the wastewater passage 100 discharges wastewater in accordance with the wastewater ratio actually generated by the reverse osmosis cartridge 30; when the concentrate solenoid valve 1001a is opened and the concentrate solenoid valve 1001b is closed, the wastewater pathway 100 discharges wastewater at a wastewater ratio of 1: 2; when the concentrate solenoid valve 1001a is closed and the concentrate solenoid valve 1001b is opened, the waste water pathway 100 discharges waste water at a waste water ratio of 1: 3.

In one embodiment, a post-filter element may be integrated into the reverse osmosis filter element 30 for improving the taste of pure water, throttling microorganisms, and the like. Alternatively, in other embodiments, the post-filter element may be separately disposed, such as after the pure water outlet e of the reverse osmosis filter element 30, before the steady flow path 80 and the cold water path 90, and it is clear to those skilled in the art that the specific modified structure is not illustrated here.

In one embodiment, as shown with reference to FIG. 8, the constant flow water purifier 10 may also be provided with a raw water TDS detector 10a and a pure water TDS detector 10 b. This stationary flow purifier 10 can confirm this reverse osmosis filter element 30's operating condition according to the testing result of this raw water TDS detector 10a and pure water TDS detector 10b, reminds the user to change the filter core when this pure water TDS detector 10b differs little with the testing result of this raw water TDS detector 10 a.

The embodiment of the present disclosure provides a stationary flow purifier 80, its stationary flow route 80 that sets up can carry out the stationary flow output to the pure water of reverse osmosis filter core 30 output, simultaneously when the flow of the pure water of reverse osmosis filter core 30 output is great, pure water route 60 can transmit unnecessary pure water to the storage of water drive jar, when the water drive jar has held full pure water, this backward flow route 70 can also be with the unable pure water of storage of this water drive jar input reverse osmosis filter core 30 once more, realize the closed loop backward flow, avoid the pure water extravagant.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A steady flow water purifier is characterized by at least comprising a preposed water drive composite filter element, a reverse osmosis filter element, a water inlet passage, a water purification passage, a pure water passage, a backflow passage and a steady flow passage, wherein the preposed water drive composite filter element is integrated with a preposed filter element and a water drive tank;

the preposed water drive composite filter element is provided with a raw water inlet, a purified water outlet and a water inlet and outlet of the water drive tank; the reverse osmosis filter element is at least provided with a purified water inlet and a purified water outlet;

one end of the water inlet passage is connected with a raw water inlet of the preposed water drive composite filter element, and the other end of the water inlet passage is connected with an external water source and used for providing raw water to be purified for the steady flow water purifying device;

one end of the water purification passage is connected with the water purification water outlet of the preposed water drive composite filter element, the other end of the water purification passage is connected with the water purification water inlet of the reverse osmosis filter element, and the water purification passage is provided with a first electromagnetic valve and a booster pump;

one end of the pure water passage is connected with a pure water outlet of the reverse osmosis filter element, and the other end of the pure water passage is connected with a water inlet and a water outlet of a water drive tank of the preposed water drive composite filter element; the pure water passage is provided with a first check valve, a pressure relief valve and a high-pressure switch; the forward directions of the first check valve and the pressure release valve are both the directions from the pure water outlet to the water inlet and outlet of the water drive tank; the high-voltage switch is used for being closed when the pressure on the side of the preposed water-drive composite filter element is greater than a preset threshold value and being opened when the pressure on the side of the preposed water-drive composite filter element is less than or equal to the preset threshold value;

one end of the backflow passage is connected with a water inlet and a water outlet of a water drive tank of the preposed water drive composite filter element, and the other end of the backflow passage is connected between the first electromagnetic valve arranged on the water purification passage and the booster pump; the backflow passage is provided with a second electromagnetic valve and a second check valve; the forward direction of the second check valve is the direction from the water inlet and outlet of the water drive tank to the booster pump;

one end of the steady flow passage is connected between the first check valve and the pressure release valve, and the other end of the steady flow passage is a steady flow water outlet of the steady flow water purifying device; the flow stabilizing passage is provided with a flow regulating valve.

2. The steady flow water purification unit of claim 1, wherein the steady flow path is further provided with a heating element disposed between the flow regulating valve and the steady flow water outlet.

3. The steady flow water purification unit of claim 2, wherein the steady flow path is further provided with a third solenoid valve disposed between the flow regulating valve and the heating element.

4. A flow-stabilizing water purification unit as claimed in any one of claims 1 to 3, wherein the water drive tank inlet and outlet includes an opening;

or, the water drive tank water inlet and outlet comprises a water drive tank water inlet and a water drive tank water outlet, correspondingly, the pure water passage is connected with the water drive tank water inlet in the water drive tank water inlet and outlet, and the backflow passage is connected with the water drive tank water outlet in the water drive tank water inlet and outlet.

5. A constant flow water purification unit as claimed in any one of claims 1 to 3, further comprising a cold water pathway;

one end of the cold water passage is connected between the first check valve and the pressure release valve, and the other end of the cold water passage is a cold water outlet of the steady-flow water purification device; the cold water passage is provided with a fourth electromagnetic valve.

6. A steady flow water purification unit as claimed in any one of claims 1 to 3, wherein a flow meter is further provided between the flow control valve and the first check valve.

7. A steady-flow water purification unit as claimed in any one of claims 1 to 3, wherein the water inlet passage is connected to a mains water supply line and is provided with a pressure relief valve.

8. A constant flow water purification unit as claimed in any one of claims 1 to 3, further comprising a waste water pathway; the reverse osmosis filter element is also provided with a wastewater outlet;

one end of the wastewater passage is a wastewater outlet of the steady flow water purifier, and the other end of the wastewater passage is connected with a wastewater outlet of the reverse osmosis filter element.

9. The steady flow water purification unit of claim 8, wherein the waste water pathway is provided with at least two concentrate solenoid valves having different waste water ratios.

10. A flow-stabilizing water purification unit as claimed in any one of claims 1 to 3, wherein a post-filter element is integrated within the reverse osmosis filter element.

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