CN216445058U

CN216445058U - Reflux valve and water purification machine system comprising same

Info

Publication number: CN216445058U
Application number: CN202123120683.9U
Authority: CN
Inventors: 周如景
Original assignee: Zhongshan Willpower Motor & Electric Appliance Co ltd
Current assignee: Zhongshan Willpower Motor & Electric Appliance Co ltd
Priority date: 2021-12-13
Filing date: 2021-12-13
Publication date: 2022-05-06
Anticipated expiration: 2031-12-13

Abstract

The utility model discloses a reflux valve and a water purification machine system formed by the reflux valve, and the reflux valve comprises a valve seat, wherein a side cover and a bottom cover which are matched with each other are arranged on the valve seat, a source water cavity and a first water outlet cavity which are respectively communicated with a water inlet and a water outlet are arranged in the valve seat, a water path is communicated between the source water cavity and the first water outlet cavity, a water return port is arranged on the bottom cover, a pressure relief cavity and a water return cavity communicated with the pressure relief cavity are also arranged in the valve seat, a second water outlet cavity communicated with the first water outlet cavity is formed between the side cover and the valve seat, the pressure relief cavity is communicated with the second water outlet cavity through a one-way water flow control structure, a pressure relief component for controlling the communication or the blocking of the water path between the water return port and the pressure relief cavity is arranged on the water path between the water return port and the water return cavity, and the reflux valve is arranged between a booster pump and a pretreatment unit in the water purification machine system. The utility model solves the problem that the purified water is retained in the pipeline for a long time and is deteriorated in a shutdown state.

Description

Reflux valve and water purification machine system comprising same

Technical Field

The utility model relates to the field of fluid transportation, in particular to a reflux valve and a water purification machine system formed by the reflux valve.

Background

With the development of economy, the trend of water resource condition deterioration appears in many places, the shortage of water resources and the pollution become more and more serious, and the drinking water safety problem of urban residents is obvious. Aiming at the problem of secondary pollution of urban tap water and harmful substances existing in the tap water due to source water pollution, more and more household water purification machines taking a reverse osmosis membrane as a core filtering unit enter thousands of households. The existing household water purifier takes a reverse osmosis membrane as a core filtering unit, tap water enters the reverse osmosis membrane unit after being subjected to multi-stage pretreatment and pressurization, and the produced pure water can completely meet the standard of domestic drinking water of developed countries.

However, in the existing water purification machine system, when the purified water is stopped, if the system is stopped for a long time, the purified water in the purified water pipeline is retained for a long time, in the process, because the reverse osmosis membrane unit can generate a forward osmosis phenomenon, the salt with higher concentration in the raw water can slowly permeate the reverse osmosis membrane to enter the purified water pipeline, the quality of the purified water is further deteriorated, and the health of people can be adversely affected after drinking.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a reflux valve and a water purification machine system formed by the reflux valve, which are used for solving the problem that purified water is retained in a pipeline for a long time and is deteriorated in a shutdown state, solving the problem of the water pressure of source water entering a reverse osmosis membrane group and avoiding the adverse effect of overlarge water pressure on the system.

In order to solve the technical problem, the utility model adopts the following scheme:

the utility model provides a backflow valve, includes the disk seat, be equipped with side cap, the bottom of matcing on the disk seat, be equipped with in the disk seat respectively with water inlet, the source water cavity of delivery port switch-on, first play water cavity, the water route switch-on between source water cavity, the first play water cavity, be equipped with the return water mouth on the bottom, still be equipped with in the disk seat and let out the pressure chamber, with the return water cavity of letting out the pressure chamber switch-on, constitute between side cap and the disk seat and go out the water cavity with the second of first play water cavity switch-on, let out the pressure chamber and go out the water cavity switch-on through one-way rivers control structure and second, be equipped with on the water route between return water mouth and the return water cavity and be used for controlling the pressure release subassembly that the water route switch-on or block between return water mouth and the pressure chamber.

According to the scheme, a backflow valve is designed, wherein a side cover and a bottom cover are respectively installed on two sides of a valve seat, a water outlet is formed in the side cover, a water inlet and a water return port are formed in the bottom cover, the water inlet is used for source water to enter, the water return port is used for backflow of purified water or other water flows, a first water outlet cavity, a second water outlet cavity and the water outlet are communicated with one another, the source water enters the first water outlet cavity from the water inlet and the source water cavity and is conveyed to the next component from the water outlet, and input of the source water is completed; the backflow valve has the function of automatically adjusting the opening or closing of the backflow waterway, after the backflow valve is applied to a water purifier system, when the water outlet faucet of purified water in the purified water pipeline is closed, deteriorated purified water in the purified water pipeline can be forcibly returned to the original water pipeline to participate in water production again by adopting a method for starting the water purifier system, so that the quality of the purified water in the purified water pipeline is maintained; so, the water purification machine system has avoided the water purification to be detained in the water purification pipeline at the long-time stay of system's off-state, has reduced the risk that the quality of water purification emergence is become, has ensured drinking water personnel's healthy.

Optionally, the pressure relief assembly comprises a pressure sensing plate, a first sleeve, a second sleeve, a first spring and a support, the support is connected with the valve seat body, the one-way water flow control structure is arranged on the support, one end of the first sleeve is connected with the support in a sliding and sealing manner, the other end of the first sleeve penetrates through the pressure sensing plate and is connected with one end of the second sleeve, the other end of the second sleeve is connected with a first guide sleeve formed by the bottom cover body in a sliding and sealing manner, the other end of the second sleeve is connected with the other side surface of the pressure sensing plate, the pressure relief cavity is formed between the first sleeve and the support, a first atmosphere cavity is formed between the pressure sensing plate and the first sleeve, the support and the inner wall of the valve seat, a first atmosphere hole communicated with the outside atmosphere is arranged on the valve seat, the water return cavity is formed between the second sleeve and the bottom cover, a first partition plate is arranged on a water path communicated with the first sleeve and the second sleeve, and a water return hole communicated with the water cavity and the pressure relief cavity is arranged on the first partition plate, first spring one end acts on the support, and the other end acts on first baffle, the sense pressure board drives the second sleeve and controls the switch-on of water route between return water mouth, the return water chamber or block under return water mouth pressure, first atmosphere intracavity atmospheric pressure and first spring force combined action.

Optionally, the one-way water flow control structure comprises a one-way valve plate and a one-way partition plate formed by the support body, the one-way partition plate is provided with a water passing hole communicated with a water channel between the pressure relief cavity and the second water outlet cavity, the one-way valve plate is fixedly connected with the middle part of the one-way partition plate, and the one-way valve plate covers the water passing hole.

Optionally, the pressure sensing plate is circumferentially sleeved with a third sealing ring, and the first sealing ring and the second sealing ring are respectively sleeved on the first sleeve and the second sleeve circumferentially.

Optionally, a first guide sleeve formed by the bottom cover body is sleeved on the outer side of the second sleeve, and a return water channel communicated with the return water port is arranged on the side wall of the first guide sleeve.

Optionally, a pressure reducing assembly is arranged on a water path through which the first water outlet cavity and the source water cavity are communicated, the pressure reducing assembly comprises a control rod and a second spring, one end of the control rod and a side cover form the first water outlet cavity, the other end of the control rod and a bottom cover form a low-pressure water cavity, a through cavity is arranged in the middle of the control rod, a second partition plate is arranged in the cavity, a water flow through hole for communicating the first water outlet cavity and the low-pressure water cavity is formed in the second partition plate, one end of the second spring acts on the bottom cover, the other end of the second spring acts on the second partition plate, a second guide sleeve is arranged on the side face of the bottom cover and slidably sleeved on the control rod, a water inlet channel for communicating the source water cavity and the low-pressure water cavity is arranged on the side wall of the second guide sleeve, a second atmosphere cavity is formed between the control rod and the inner wall of the valve seat, a second atmosphere hole for communicating the atmosphere is arranged on the side wall of the valve seat, and the control rod controls the source water cavity under the combined action of the water pressure of the first water outlet cavity, the pressure of the second atmosphere cavity and the elasticity of the second spring, And the water paths between the low-pressure water chambers are communicated or cut off.

Optionally, a limiting sleeve for limiting displacement of the control rod is arranged on the side cover, and a water passing groove communicated with the first water outlet cavity and the second water outlet cavity is formed in the side wall of the limiting sleeve.

Optionally, a fourth sealing ring and a fifth sealing ring are respectively sleeved on the side walls of the two ends of the control rod, and a sixth sealing ring is compressed between the control rod and the inner wall of the valve seat.

Optionally, a sealing gasket embedded in the valve seat body is compressed between the valve seat and the bottom cover.

The utility model provides a water purification machine system that above-mentioned backwash valve constitutes, including the preprocessing unit, the booster pump, the reverse osmosis membrane group, wash the solenoid valve, be provided with the backwash valve between booster pump and the preprocessing unit, the end of intaking of booster pump and the delivery port tube coupling of backwash valve, the water outlet end of preprocessing unit and the water inlet tube coupling of backwash valve, the water outlet end of booster pump and the water inlet end tube coupling of reverse osmosis membrane group, the water purification end of reverse osmosis membrane group is connected with the tee bend, the dense water end of reverse osmosis membrane group is connected with the solenoid valve of washing, water purification tap is connected to tee bend's a port, another port passes through the back flow and is connected with the return water mouth of backwash valve.

The utility model has the following beneficial effects:

1. according to the utility model, the backflow valve is arranged between the booster pump and the pretreatment unit, the backflow valve has the functions of backflow and source water pressure adjustment, and after source water of the pretreatment unit enters a water inlet of the backflow valve, the pressure reduction assembly can automatically adjust the source water pressure of a water outlet, so that the source water pressure is controlled within a preset pressure value range; when the water purification faucet is closed, the purified water manufactured in the operation process of the system is forced to flow back to the original water pipeline to participate in the water preparation again, namely, the purified water coming out of the reverse osmosis membrane group is conveyed to the water return port of the return valve through the return pipeline again, when the pressure reaches a preset value, the pressure relief assembly in the return valve is communicated with the water channel between the water return port and the water return cavity, so that the purified water flows back to the second water outlet cavity and is conveyed to the reverse osmosis membrane group by the water outlet to be filtered again, and therefore, the problem that the purified water is retained in the pipeline for a long time under a shutdown state is avoided, the risk that the purified water deteriorates is reduced, and the health of drinking water personnel is ensured.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a pressure relief assembly;

FIG. 3 is a schematic view of a pressure relief assembly;

fig. 4 is a schematic structural diagram of a water purification machine system.

Reference numerals: 01-water inlet, 02-bottom cover, 03-water return port, 04-valve seat, 05-side cover, 06-water outlet, 07-source water cavity, 08-water inlet channel, 09-low pressure water cavity, 10-second spring, 11-fifth sealing ring, 12-second guide sleeve, 13-pressing sleeve, 14-control rod, 15-water passing groove, 16-first water outlet cavity, 17-second partition plate, 18-water flow through hole, 19-limiting sleeve, 20-fourth sealing ring, 21-second atmosphere cavity, 22-second atmosphere hole, 23-sixth sealing ring, 24-sealing pad, 25-water return channel, 26-second sleeve, 27-first partition plate, 28-third sealing ring, 29-first atmosphere cavity, 30-a first atmospheric hole, 31-a water return hole, 32-a first sleeve, 33-a first sealing ring, 34-a one-way partition plate, 35-a one-way valve plate, 36-a water passing hole, 37-a first spring, 38-a second water outlet cavity, 39-a bracket, 40-a first guide sleeve, 41-a water return cavity, 42-a second sealing ring, 43-a water inlet pipe, 44-a pretreatment unit, 45-a water return pipe, 46-a tee joint, 47-a water purification pipe, 48-a water purification faucet, 49-a concentrated water pipe, 50-a reverse osmosis membrane group, 51-a booster pump, 52-a return valve, 53-a flushing electromagnetic valve, 54-a pressure sensing plate and 55-a pressure relief cavity.

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element that is referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "open," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

As shown in fig. 1-3, a backflow valve includes a valve seat 04, a side cover 05 and a bottom cover 02 are disposed on the valve seat 04, a source water cavity 07 and a first water outlet cavity 16 are disposed in the valve seat 04 and are respectively communicated with a water inlet 01 and a water outlet 06, a water path between the source water cavity 07 and the first water outlet cavity 16 is communicated, a water return port 03 is disposed on the bottom cover 02, a pressure release cavity 55 and a water return cavity 41 communicated with the pressure release cavity 55 are further disposed in the valve seat 04, a second water outlet cavity 38 communicated with the first water outlet cavity 16 is formed between the side cover 05 and the valve seat 04, the pressure release cavity 55 is communicated with the second water outlet cavity 38 through a one-way water flow control structure, and a pressure release component for controlling the water path between the water return port 03 and the pressure release cavity 55 to be communicated or blocked is disposed on the water path between the water return port 03 and the water return cavity 41.

In the embodiment, the utility model designs the reflux valve, the side cover 05 and the bottom cover 02 are respectively installed on two sides of the valve seat 04 in a matching manner, the sealing gasket 24 embedded in the valve seat 04 body is compressed between the valve seat 04 and the bottom cover 02, and the sealing performance between the bottom cover 02 and the valve seat 04 is enhanced by the sealing gasket 24, so that the water leakage phenomenon is avoided; a water outlet 06 protruding to the left is arranged on the side cover 05, a water inlet 01 protruding to the right and a water return port 03 are arranged on the bottom cover 02, the water inlet 01 is used for the entering of source water, the water return port 03 is used for the backflow of purified water or other water flows, the first water outlet cavity 16, the second water outlet cavity 38 and the water outlet 06 are communicated with each other, the source water enters the first water outlet cavity 16 from the water inlet 01 and the source water cavity 07 and is conveyed to the next component from the water outlet 06, and the inputting of the source water is completed; the return water enters the return water port 03 through the return pipe, when the pressure of the return water port 03 reaches the preset pressure value of the pressure relief component, the pressure relief component is communicated with the water path between the return water port 03 and the return water cavity 41, then enters the pressure relief cavity 55 and the second water outlet cavity 38 through the return water cavity 41, and finally is conveyed to the next component through the water outlet 06, the return valve 52 has the function of automatically adjusting the opening or closing of the return water path, after the return water is applied to the water purifier system, the purified water in the purified water pipe 47 can flow the deteriorated water in the purified water pipe back to the original water pipe to participate in water production again by adopting a method of forcibly operating the system water production when the purified water faucet is closed, that is, in a shutdown state, the purified water in the purified water pipe can flow back to the water outlet 06 and the reverse osmosis membrane group 50 again, so that the purified water is prevented from being retained in the purified water pipe 47 for a long time in the shutdown state of the system, the risk of quality change of the purified water is reduced, and the health of drinking personnel is ensured.

Example 2

On the basis of the above embodiments

As shown in fig. 3

The pressure relief assembly comprises a pressure sensing plate 54, a first sleeve 32, a second sleeve 26, a first spring 37 and a bracket 39, the bracket 39 is connected with a valve seat 04 body, a one-way water flow control structure is arranged on the bracket 39, one end of the first sleeve 32 is connected with the bracket 39 in a sliding and sealing manner, the other end of the first sleeve passes through the pressure sensing plate 54 and is connected with one end of the second sleeve 26, the other end of the second sleeve 26 is connected with a first guide sleeve 40 formed by a bottom cover 02 body in a sliding and sealing manner, the other end of the second sleeve is connected with the other side surface of the pressure sensing plate 54, the pressure relief cavity 55 is formed between the first sleeve 32 and the bracket 39, a first atmosphere cavity 29 is formed between the pressure sensing plate 54 and the inner walls of the first sleeve 32, the bracket 39 and the valve seat 04, a first atmosphere hole 30 communicated with the outside atmosphere is arranged on the valve seat 04, the water return cavity 41 is formed between the second sleeve 26 and the bottom cover 02, a first water path partition plate 27 is arranged on the first sleeve 32 and the second sleeve 26, the first partition plate 27 is provided with a water return hole 31 communicated with the water return cavity 41 and the pressure relief cavity 55, one end of the first spring 37 acts on the bracket 39, the other end acts on the first partition plate 27, and the pressure sensing plate 54 drives the second sleeve 26 to control the communication or the blocking of the water path between the water return port 03 and the water return cavity 41 under the combined action of the pressure of the water return port 03, the air pressure in the first atmosphere cavity 29 and the elastic force of the first spring 37.

The one-way water flow control structure comprises a one-way valve plate 35 and a one-way partition plate 34 formed by a support 39 body, the one-way partition plate 34 is provided with a water passing hole 36 communicated with a water channel between the pressure relief cavity 55 and the second water outlet cavity 38, the one-way valve plate 35 is fixedly connected with the middle part of the one-way partition plate 34, and the one-way valve plate 35 covers the water passing hole 36. The water in the pressure release cavity 55 pushes the one-way valve plate 35 to the left, so that the water through hole 36 is communicated with the second water outlet cavity 38, and thus, the purified water flowing back in the pressure release cavity 55 can enter the second water outlet cavity 38 and is conveyed to the next component through the water outlet 06, and the one-way valve plate 35 can prevent the original water from entering the pressure release cavity 55 without stopping the system because the first water outlet cavity 16 is communicated with the second water outlet cavity 38.

The pressure sensing plate 54 is circumferentially sleeved with a third sealing ring 28, and the first sleeve 32 and the second sleeve 26 are circumferentially sleeved with a first sealing ring 33 and a second sealing ring 42 respectively. The first sleeve 32 and the second sleeve 26 are integrally designed, the pressure sensing plate 54 is arranged on the outer side of the joint of the two sleeves, the first partition plate 27 is integrally connected on the inner side of the joint of the two sleeves, and the first sealing ring 33 can enhance the sealing performance between the first sleeve 32 and the first partition plate, so that water in the pressure relief cavity 55 is prevented from entering the first atmosphere cavity 29 and further overflowing from the first atmosphere cavity 30; the second sealing ring 42 can prevent the water pressure of the water return port 03 from entering the water return cavity 41 in advance when the water pressure does not reach the preset range value of the pressure relief component, so that the normal operation of the water return function is ensured; the third sealing ring 28 effectively prevents the purified water from the water return port 03 from entering the first atmosphere chamber 29, and prevents water from leaking from the first atmosphere chamber 30.

Optionally, a first guide sleeve 40 formed by the bottom cover 02 body is sleeved outside the second sleeve 26, and a return water channel 25 communicated with the return water port 03 is arranged on the side wall of the first guide sleeve 40. The first guide sleeve 40 ensures the coaxiality of the first sleeve 32 moving left and right.

The working principle of the embodiment is as follows: after the return valve 52 is applied to the water purifier system, when the purified water faucet 48 is opened, the water pressure of the water return port 03 is lower than the preset pressure value of the pressure relief component, and at this time, the water return port 03 and the water return cavity 41 are in a blocking state; when the water purification system is stopped, the system is started, purified water is accumulated at the water return port 03, so that the water pressure of the water return port 03 is increased, when the water pressure value acting on the pressure sensing plate 54 is enough to overcome the elastic force of the first spring 37 and the air pressure value in the first atmosphere chamber 29, the water pressure of the water return port 03 pushes the pressure sensing plate 54 to move to the left (in the direction of the side cover 05), the first sleeve 32 and the second sleeve 26 follow the left movement, at the same time, the first partition plate 27 compresses the first spring 37 leftwards, when the second sealing ring 42 on the second sleeve 26 just exceeds the end of the water return flow passage 25 leftwards, the return water flow channel 25 is communicated with the return water cavity 41, the returned purified water enters the pressure relief cavity 55 through the return water cavity 41 and the return water hole 31 on the first partition plate 27, the purified water in the pressure relief cavity 55 jacks the one-way valve plate 35 leftwards, enters the second water outlet cavity 38 through the water through hole 36 and is conveyed to the next component through the water outlet 06; the larger the water pressure at the water return port 03 is, the larger the distance that the pressure sensing plate 54 moves leftward is, so that the larger the water flow area communicated between the water return flow passage 25 and the water return chamber 41 is, the more the amount of water is returned. Like this through the effect of pressure release subassembly in the return valve 52, can flow back the water purification of water purification machine system, the purification of recycling once more has avoided intaking the problem that is detained in the pipeline for a long time, has reduced the water purification and has taken place rotten risk, ensures drinking water personnel's healthy.

Example 3

On the basis of the above-mentioned embodiment 1

As shown in fig. 2, a water path connecting the first water outlet cavity 16 and the source water cavity 07 is provided with a pressure reducing assembly, the pressure reducing assembly comprises a control rod 14 and a second spring 10, one end of the control rod 14 and a side cover 05 form the first water outlet cavity 16, the other end of the control rod and a bottom cover 02 form a low pressure water cavity 09, a through cavity is arranged in the middle of the control rod 14, a second partition 17 is arranged in the cavity, a water flow through hole 18 for connecting the first water outlet cavity 16 and the low pressure water cavity 09 is arranged on the second partition 17, one end of the second spring 10 acts on the bottom cover 02, the other end of the second spring acts on the second partition 17, a second guide sleeve 12 slidably sleeved on the control rod 14 is arranged on the side surface of the bottom cover 02, a water inlet channel 08 for connecting the source water cavity 07 and the low pressure water cavity 09 is arranged on the side wall of the second guide sleeve 12, a second atmosphere cavity 21 is formed between the control rod 14 and the inner wall of the valve seat 04, a second atmosphere hole 22 is arranged on the side wall of the valve seat 04, the control rod 14 controls the connection or the interception of the water path between the source water cavity 07 and the low-pressure water cavity 09 under the combined action of the water pressure of the first water outlet cavity 16, the air pressure in the second atmosphere cavity 21 and the elastic force of the second spring 10.

A limiting sleeve 19 used for limiting the displacement of the control rod 14 is arranged on the side cover 05, and a water passing groove 15 communicated with the first water outlet cavity 16 and the second water outlet cavity 38 is arranged on the side wall of the limiting sleeve 19. Limiting sleeve 19 and side cap 05 integrated design are right-hand member open-ended sleeve form, and limiting sleeve 19 cover is established and is used for connecting disk seat 04 in the disk seat 04, and the distance scope of restriction control lever 14 left movement simultaneously restricts the runner area of putting through between water runner and the low pressure water cavity 09 like this to restriction source water gets into the flow of low pressure water cavity 09.

And the side walls of the two ends of the control rod 14 are respectively sleeved with a fourth sealing ring 20 and a fifth sealing ring 11, and a sixth sealing ring 23 is compressed between the control rod 14 and the inner wall of the valve seat 04. The fourth sealing ring 20 can prevent the source water in the first water outlet cavity 16 from entering the second atmosphere cavity 21, and further prevent the water from leaking from the second atmosphere hole 22; the fifth sealing ring 11 is used for sealing or intercepting a water path between the water inlet channel 08 and the low-pressure water cavity 09 when the control rod 14 moves transversely, so that the sealing or intercepting performance is enhanced; the sixth sealing ring 23 prevents the source water in the source water cavity 07 from entering the second atmosphere cavity 21 to cause water leakage.

Example 4

On the basis of the above embodiments

As shown in FIG. 4, a water purification system comprising the above-mentioned return valve comprises a pre-treatment unit 44, a booster pump 51, a reverse osmosis membrane module 50, and a flushing solenoid valve 53, wherein the return valve 52 is disposed between the booster pump 51 and the pre-treatment unit 44, a water inlet end of the booster pump 51 is connected to a water outlet 06 of the return valve 52 by a pipeline, a water outlet end of the pre-treatment unit 44 is connected to a water inlet 01 of the return valve 52 by a pipeline, a water outlet end of the booster pump 51 is connected to a water inlet end of the reverse osmosis membrane module 50 by a pipeline, a water purifying end of the reverse osmosis membrane module 50 is connected to a tee 46, a water concentrate end of the reverse osmosis membrane module 50 is connected to the flushing solenoid valve 53, one port of the tee 46 is connected to a water purifying tap 48, and the other port is connected to a water return port 03 of the return valve 52 by a return pipe.

In this embodiment, the return valve 52 is installed between the pressure pump 51 and the pre-processing unit 44, the pre-processing unit 44 is a filtering device for pre-filtering the source water, which belongs to a common filtering component in a water purification system, the return valve 52 has the functions of returning and adjusting the source water pressure, the source water enters the pre-processing unit 44 through the water inlet pipe 43 to primarily filter most impurities, then the source water of the pre-processing unit 44 enters the water inlet 01 of the return valve 52, the pressure reducing component can automatically adjust the source water pressure of the water outlet 06 of the return valve 52, so that the source water pressure is controlled within the range of the preset pressure value, when the water purifying faucet 48 is used, the purified water comes out from the purified water end of the reverse osmosis membrane set 50 and is conveyed to the water purifying faucet 48 through an outlet of the tee 46 for external use, at this time, the water pressure in the water return pipe 45 is low, and cannot reach the preset pressure value of the opening of the pressure reducing component, the water return function of the return valve 52 is suspended; when the purified water faucet 48 is closed, the system can be forced to operate, at this time, the purified water from the reverse osmosis membrane group 50 enters the water return pipe 45 through the other outlet of the tee joint 46, and is conveyed to the water return port 03 of the return valve 52 through the water return pipe 45, the pressure value of the water return port 03 is gradually increased along with the increase of the return water, and when the pressure reaches the preset value of the pressure relief component, the pressure relief component in the return valve 52 is communicated with the water path between the water return port 03 and the water return cavity 41, so that the purified water flows back to the second water outlet cavity 38; because the water pressure of the source water is reduced to be lower than the water pressure of the backflow purified water by the pressure reducing assembly, the backflow effect of the backflow purified water is realized, and the backflow purified water is conveyed to the reverse osmosis membrane group 50 by the water outlet 06 to be filtered again, so that the water is prevented from being detained in a pipeline for a long time in a shutdown state, the risk of deterioration of the purified water is reduced, and the health of drinking water personnel is ensured.

The foregoing is only a preferred embodiment of the present invention, and the present invention is not limited thereto in any way, and any simple modification, equivalent replacement and improvement made to the above embodiment within the spirit and principle of the present invention still fall within the protection scope of the present invention.

Claims

1. A backflow valve comprises a valve seat (04), wherein a side cover (05) and a bottom cover (02) which are matched with each other are arranged on the valve seat (04), a source water cavity (07) and a first water outlet cavity (16) which are respectively communicated with a water inlet (01) and a water outlet (06) are arranged in the valve seat (04), a water path is communicated between the source water cavity (07) and the first water outlet cavity (16), the novel water-saving water pump is characterized in that a water return port (03) is formed in the bottom cover, a pressure relief cavity (55) and a water return cavity (41) communicated with the pressure relief cavity (55) are further formed in the valve seat (04), a second water outlet cavity (38) communicated with the first water outlet cavity (16) is formed between the side cover (05) and the valve seat (04), the pressure relief cavity (55) is communicated with the second water outlet cavity (38) through a one-way water flow control structure, and a pressure relief assembly used for controlling the communication or blocking of a water path between the water return port (03) and the pressure relief cavity (55) is arranged on the water path between the water return port (03) and the water return cavity (41).

2. The backflow valve according to claim 1, wherein the pressure relief assembly comprises a pressure sensing plate (54), a first sleeve (32), a second sleeve (26), a first spring (37) and a bracket (39), the bracket (39) is connected with the valve seat (04) body, the one-way water flow control structure is arranged on the bracket (39), one end of the first sleeve (32) is connected with the bracket (39) in a sliding and sealing manner, the other end of the first sleeve penetrates through the pressure sensing plate (54) and is connected with one end of the second sleeve (26), the other end of the second sleeve (26) is connected with a first guide sleeve (40) formed by the bottom cover (02) body in a sliding and sealing manner, the other end of the second sleeve is connected with the other side surface of the pressure sensing plate (54), the pressure relief cavity (55) is formed between the first sleeve (32) and the bracket (39), and a first large air cavity (29) is formed between the pressure sensing plate (54) and the inner walls of the first sleeve (32), the bracket (39) and the valve seat (04), be equipped with first atmospheric hole (30) of switch-on external atmosphere on disk seat (04), constitute between second sleeve (26) and bottom (02) return water chamber (41), be equipped with first baffle (27) on the water route of first sleeve (32), second sleeve (26) switch-on, be equipped with on first baffle (27) and put through return water chamber (41), return water hole (31) of decompression chamber (55), first spring (37) one end acts on support (39), and the other end acts on first baffle (27), pressure sensing board (54) drive second sleeve (26) and control the switch-on or block of water route between return water mouth (03), return water chamber (41) under return water mouth (03) pressure, first atmospheric chamber (29) internal pressure and first spring (37) elasticity combined action.

3. The backflow valve according to claim 2, wherein the one-way water flow control structure comprises a one-way valve plate (35) and a one-way partition plate (34) formed by a support (39) body, the one-way partition plate (34) is provided with a water through hole (36) communicated with a water channel between the pressure relief cavity (55) and the second water outlet cavity (38), the one-way valve plate (35) is fixedly connected with the middle part of the one-way partition plate (34), and the one-way valve plate (35) covers the water through hole (36).

4. A reflux valve as claimed in claim 2, wherein the pressure sensing plate (54) is circumferentially provided with a third sealing ring (28), and the first sleeve (32) and the second sleeve (26) are circumferentially provided with a first sealing ring (33) and a second sealing ring (42), respectively.

5. A return valve according to claim 4, characterised in that the second sleeve (26) is externally fitted with a first guide sleeve (40) formed by the body of the bottom cover (02), and the side wall of the first guide sleeve (40) is provided with a return water channel (25) communicating with the return water port (03).

6. The backflow valve according to claim 1, wherein a pressure reducing assembly is arranged on a waterway connecting the first water outlet cavity (16) and the source water cavity (07), the pressure reducing assembly comprises a control rod (14) and a second spring (10), one end of the control rod (14) and the side cover (05) form the first water outlet cavity (16), the other end of the control rod and the bottom cover (02) form a low-pressure water cavity (09), a through cavity is arranged in the middle of the control rod (14), a second partition plate (17) is arranged in the cavity, a water flow through hole (18) connecting the first water outlet cavity (16) and the low-pressure water cavity (09) is arranged on the second partition plate (17), one end of the second spring (10) acts on the bottom cover (02), the other end of the second spring acts on the second partition plate (17), a second guide sleeve (12) slidably sleeved on the control rod (14) is arranged on the side surface of the bottom cover (02), and a source water cavity (07) is connected to the side wall of the second guide sleeve (12), A second atmosphere cavity (21) is formed between a control rod (14) and the inner wall of a valve seat (04) of a water inlet channel (08) of a low-pressure water cavity (09), a second atmosphere hole (22) communicated with the atmosphere is formed in the side wall of the valve seat (04), and the control rod (14) controls the communication or the closure of a water channel between a source water cavity (07) and the low-pressure water cavity (09) under the combined action of the water pressure of a first water outlet cavity (16), the air pressure in the second atmosphere cavity (21) and the elastic force of a second spring (10).

7. The backflow valve according to claim 6, wherein a limiting sleeve (19) for limiting the displacement of the control rod (14) is arranged on the side cover (05), and a water passing groove (15) communicated with the first water outlet cavity (16) and the second water outlet cavity (38) is arranged on the side wall of the limiting sleeve (19).

8. A reflux valve as claimed in claim 6, characterized in that the side walls of the two ends of the control rod (14) are respectively sleeved with a fourth sealing ring (20) and a fifth sealing ring (11), and a sixth sealing ring (23) is compressed between the control rod (14) and the inner wall of the valve seat (04).

9. A reflux valve as claimed in claim 1, characterized in that a sealing gasket (24) embedded in the body of the valve seat (04) is compressed between the valve seat (04) and the bottom cover (02).

10. A water purification system comprising a return valve according to any of claims 1 to 9, it is characterized by comprising a pretreatment unit (44), a booster pump (51), a reverse osmosis membrane group (50) and a flushing electromagnetic valve (53), be equipped with backward flow valve (52) between booster pump (51) and preprocessing unit (44), the delivery port (06) tube coupling of the end of intaking of booster pump (51) and backward flow valve (52), the water outlet end of preprocessing unit (44) and water inlet (01) tube coupling of backward flow valve (52), the water outlet end of booster pump (51) and the water inlet end tube coupling of reverse osmosis membrane group (50), the water purification end of reverse osmosis membrane group (50) is connected with tee bend (46), the dense water end of reverse osmosis membrane group (50) with wash solenoid valve (53) and be connected, water purification tap (48) are connected to a port of tee bend (46), another port passes through the back flow and is connected with return water mouth (03) of backward flow valve (52).