CN219774962U - Water-saving valve and filtering system - Google Patents

Abstract

The utility model relates to the technical field of water-saving valves, in particular to a water-saving valve and a filtering system. The water-saving valve comprises a shell, a flexible film, a connecting rod, a drainage piece and an elastic piece, wherein the water pressure transmission hole is covered by the flexible film, when the water pressure in the tap water cavity rises, the flexible film can bulge towards the direction of the movable cavity and push the connecting rod connected with the flexible film to move towards the first direction, so that the waste water port is enlarged, and the elastic piece is stressed to deform; when the water pressure reduces, the flexible film does not bulge, and the connecting rod receives the resilience force effect of elastic component and moves towards the second direction, makes the waste water mouth reduce, and the water-saving valve can be through the size of automatic adjustment waste water mouth of a river in the water cavity of running water, and the water pressure is higher then matches great waste water mouth, and the water pressure is lower then matches less waste water mouth for pure waste water can stabilize at higher level, and when the complete machine switch simultaneously, or when running water pressure is undulant, the waste water mouth corresponds and carries out size adjustment, can prevent that the foreign matter from with waste water Kong Dusi.

Description

Water-saving valve and filtering system

Technical Field

The utility model relates to the technical field of water-saving valves, in particular to a water-saving valve and a filtering system.

Background

The reverse osmosis filter equipment is water treatment equipment which utilizes the reverse osmosis principle and carries out deep filtration and purification treatment on water quality according to the use requirement of the water, and the main core element of the reverse osmosis filter equipment is RO membrane.

The existing wastewater valve of reverse osmosis filtration equipment uses a wastewater port of a fixed size to drain wastewater. When the water pressure of tap water is too small, most of water is discharged through the waste water, the proportion of pure water to the waste water is low, and excessive tap water waste is caused; if a smaller waste water port is used, although the ratio of pure water to waste water is improved, the waste water port is easy to scale due to the small waste water port, and foreign matter blockage is also easy to cause.

Therefore, there is a need to design a new water-saving valve.

Disclosure of Invention

In view of the above, the utility model provides a water-saving valve and a filtering system, which are used for solving the problems that in the prior art, the waste water is wasted more or the waste water port is easy to scale and foreign matters are blocked due to the fact that the waste water valve uses the waste water port with a fixed size for drainage.

In order to solve the technical problems, the utility model adopts a technical scheme that the water-saving valve comprises a shell, a flexible film, a connecting rod and an elastic piece, wherein a tap water cavity, a movable cavity and a waste water cavity are arranged in the shell, a water pressure transmission hole is arranged between the tap water cavity and the movable cavity, and a communication hole is arranged between the movable cavity and the waste water cavity; the connecting rod comprises a drainage piece, a partition plate is arranged in the waste water cavity, a first drainage port is formed in the partition plate, the drainage piece is arranged in the waste water cavity and is in fit connection with the partition plate, a second drainage port is formed in the drainage piece, and the first drainage port is communicated with the second drainage port to form a waste water port; the flexible film covers the water pressure transmission hole, one end of the connecting rod is connected with the flexible film, the other end of the connecting rod penetrates through the communication hole and is connected with the drainage piece, the elastic piece is arranged in the movable cavity and is sleeved on the periphery side of the connecting rod, and the elastic piece is in stressed abutting connection with the bottom end surface between the waste water cavity and the movable cavity; when the water pressure in the tap water cavity is increased, the flexible film pushes the connecting rod to move towards a first direction, the waste water port is increased, and the elastic piece is stressed to deform; when the water pressure in the tap water cavity is reduced, the connecting rod moves towards a second direction under the action of the resilience force of the elastic piece, the waste water port is reduced, and the first direction is opposite to the second direction.

Preferably, the flexible film is thin in the middle and thick in the periphery.

Preferably, the connecting rod further comprises a cross rod and a vertical rod, the cross rod and the vertical rod are integrally formed, the cross rod is connected with the flexible film, and the vertical rod passes through the communication hole and is connected with the drainage piece.

Preferably, the height of the drainage member is smaller than the height of the waste water chamber, and the width of the drainage member is equal to the width of the waste water chamber.

Preferably, the waste water port is the largest when the drainage piece is abutted against the top end surface of the waste water cavity; when the drainage piece is abutted to the bottom end face of the waste water cavity, the waste water port is minimum.

Preferably, the water-saving valve further comprises an annular stabilizing piece, wherein the annular stabilizing piece is arranged between the connecting rod and the elastic piece and is connected to the top surface of the movable cavity.

Preferably, the water-saving valve further comprises a waterproof ring, and the waterproof ring is sleeved on the periphery side of the connecting rod and in interference fit with the annular stabilizing piece.

Preferably, the width of the first water outlet is equal to the width of the waste water cavity, and the width of the second water outlet is smaller than the width of the waste water cavity.

The utility model also provides a filtering system for solving the technical problems, the filtering system comprises a filtering main body and the water-saving valve, the filtering main body is provided with a tap water port, a waste water hole and a water purifying port, the tap water cavity is communicated with the tap water port, and the waste water hole is communicated with the waste water cavity; tap water flows into the filtering main body through the tap water cavity and the tap water port, the filtering main body filters the tap water, filtered waste water flows out through the waste water hole and the waste water cavity, and filtered clean water flows out through the clean water port.

Preferably, the filter body comprises an RO cartridge.

Compared with the prior art, the water-saving valve and the filtering system provided by the embodiment of the utility model have the following advantages:

1. in the water-saving valve provided by the utility model, the water-saving valve comprises a shell, a flexible film, a connecting rod and an elastic piece, wherein a tap water cavity, a movable cavity and a waste water cavity are arranged in the shell, a water pressure transmission hole is arranged between the tap water cavity and the movable cavity, and a communication hole is arranged between the movable cavity and the waste water cavity; the waste water cavity is internally provided with a baffle plate, the baffle plate is provided with a first water outlet, the connecting rod comprises a water draining piece, the water draining piece is arranged in the waste water cavity and is in fit connection with the baffle plate, the water draining piece is provided with a second water outlet, and the first water outlet is communicated with the second water outlet to form a waste water outlet; the flexible film covers the water pressure transmission hole, one end of the connecting rod is connected with the flexible film, the other end of the connecting rod passes through the communication hole and is connected with the drainage piece, the elastic piece is arranged in the movable cavity and sleeved on the periphery side of the connecting rod, and the elastic piece is stressed and abutted to the top surface of the movable cavity; when the water pressure in the tap water cavity is increased, the flexible film pushes the connecting rod to move in the first direction, the waste water port is increased, and the elastic piece is stressed to deform; when the water pressure in the tap water cavity is reduced, the connecting rod moves towards the second direction under the action of the resilience force of the elastic piece, the waste water port is reduced, and the first direction is opposite to the second direction. The water pressure transmission hole is covered by the flexible film, when the water pressure in the tap water cavity rises, the flexible film can bulge towards the direction of the movable cavity and push the connecting rod connected with the flexible film to move towards the first direction, so that the waste water port is enlarged, and the elastic piece is stressed to deform; when the water pressure in the tap water cavity reduces, the flexible film does not bulge, the connecting rod moves towards the second direction under the action of the resilience force of the elastic piece, so that the waste water port is reduced, therefore, the water-saving valve can automatically adjust the size of the waste water port through the water pressure in the tap water cavity, the water pressure is higher and matches with the larger waste water port, the water pressure is lower and matches with the smaller waste water port, the pure waste water can be stabilized at the higher level, and meanwhile, when the whole machine is switched on or tap water pressure fluctuates, the waste water port correspondingly adjusts the size, so that the waste water hole can be prevented from being blocked by foreign matters, and the problems that the tap water is more wasted or the waste water port is easy to scale and the foreign matters are blocked due to the fact that the waste water port is drained through the waste water port with the fixed size in the prior art are solved.

2. In the water-saving valve provided by the utility model, the flexible film is thin in the middle and thick in the periphery, so that the water-saving valve can sense when fluctuation of water pressure rise is small, and can bulge towards the direction of the movable cavity to push the connecting rod; the flexible film is arranged to be thick all around, so that the connection between the periphery of the flexible film and the periphery of the water pressure transmission hole is firmer, the situation that the flexible film is loosened due to the force generated by suddenly increasing the water pressure of the tap water is prevented, and meanwhile, the sensitivity and the firmness of the flexible film are improved.

3. In the water-saving valve provided by the utility model, the connecting rod further comprises a cross rod and a vertical rod, the cross rod and the vertical rod are integrally formed, the cross rod is connected with the flexible film, and the vertical rod penetrates through the communication hole and is connected with the drainage piece. The connecting rod is arranged by arranging the cross rod and the vertical rod in an integrated manner, the cross rod is connected with the flexible film, the vertical rod passes through the communication hole and is connected with the drainage piece, so that the cross rod and the vertical rod can be pushed to move in the first direction in a labor-saving manner by slightly protruding the flexible film, and the drainage piece is driven to move.

4. In the water-saving valve provided by the utility model, the height of the water draining part is smaller than that of the waste water cavity, and the width of the water draining part is equal to that of the waste water cavity. The height of the drainage piece is smaller than that of the waste water cavity, so that the drainage piece has a space which moves back and forth between a first direction and a second direction; the width of the drainage piece is set to be equal to the width of the waste water cavity, so that the situation that the drainage piece deflects in the moving process of the drainage piece in the waste water cavity can be prevented.

5. In the water-saving valve provided by the utility model, the water-saving valve further comprises an annular stabilizing piece, wherein the annular stabilizing piece is arranged between the connecting rod and the elastic piece and is connected with the top surface of the movable cavity. The annular stabilizing piece is arranged between the connecting rod and the elastic piece and is not only used for stabilizing the elastic piece and preventing the elastic piece from loosening; and the connecting rod can be stabilized, so that the condition that the connecting rod deflects in the reciprocating motion process between the first direction and the second direction is prevented.

6. In the water-saving valve provided by the utility model, the water-saving valve further comprises a waterproof ring which is sleeved on the periphery side of the connecting rod and is in interference fit with the annular stabilizing piece. By providing the waterproof ring, water in the waste water chamber can be prevented from flowing into the movable chamber from the gap between the connecting rod and the communication hole.

7. The function of the filtering system provided by the utility model is the same as that of the water-saving valve, and is not repeated here.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Wherein:

fig. 1 is a schematic perspective view of a water saving valve according to a first embodiment of the present utility model;

FIG. 2 is a schematic side view of a water saving valve according to an embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view showing the structure of a housing of a water saving valve according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram showing a cross-sectional structure of a water-saving valve according to an embodiment of the present utility model when the water pressure in a tap water chamber is small;

FIG. 5 is a schematic diagram showing a cross-sectional structure of a water-saving valve according to an embodiment of the present utility model when the water pressure in a tap water chamber is high;

FIG. 6 is a schematic perspective view showing a flexible membrane of a water-saving valve according to an embodiment of the utility model;

FIG. 7 is a schematic perspective view showing a connecting rod of a water saving valve according to an embodiment of the utility model;

fig. 8 shows a schematic structural diagram of a filtration system according to a second embodiment of the present utility model.

The attached drawings are used for identifying and describing:

1. a water-saving valve; 2. a filtration system;

11. a housing; 12. a flexible film; 13. a connecting rod; 14. an elastic member; 15. a ring-shaped stabilizing piece; 16. a waterproof ring; 21. a filtering body;

111. tap water cavity; 112. a movable cavity; 113. a waste water chamber; 114. a first partition plate; 115. a second partition plate; 131. a drain member; 132. a cross bar; 133. a vertical rod; 211. a tap water port; 212. a waste water hole; 213. a water purifying port; 214. RO filter core;

1111. a water pressure transmission hole; 1121. a communication hole; 1131. a partition plate; 1132. a first drain port; 1133. a waste water port; 1134. an upper partition plate; 1135. a lower partition plate; 1311. a second drain port; 1141. a first end face; 1142. a second end face; 1143. and a third end surface.

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Embodiments of the utility model are illustrated in the accompanying drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

It will be understood that the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only. In the present utility model, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present utility model and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present utility model will be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "disposed," "configured," "connected," "coupled," and the like are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Example 1

Referring to fig. 1 to 3, a first embodiment of the present utility model discloses a water saving valve 1, the water saving valve 1 including a housing 11, a flexible film 12, a connecting rod 13 and an elastic member 14.

Wherein, the shell 11 is provided with a tap water cavity 111, a movable cavity 112 and a waste water cavity 113, a water pressure transmission hole 1111 is arranged between the tap water cavity 111 and the movable cavity 112, and a communication hole 1121 is arranged between the movable cavity 112 and the waste water cavity 113.

Specifically, the tap water chamber 111 and the movable chamber 112 are separated by a first partition plate 114, the movable chamber 112 and the waste water chamber 113 are separated by a second partition plate 115, the water pressure transmission hole 1111 is formed in the first partition plate 114, and the communication hole 1121 is formed in the second partition plate 115.

More specifically, the side of the second partition plate 115 close to the movable chamber 112 is a first end surface 1141, the side of the second partition plate 115 close to the waste water chamber 113 is a second end surface 1142, and the side of the waste water chamber 113 opposite to the second end surface 1142 is a third end surface 1143.

Referring to fig. 3 to 5, further, the connecting rod 13 includes a drain member 131, a partition 1131 is disposed in the waste water chamber 113, a first drain outlet 1132 is disposed on the partition 1131, the drain member 131 is disposed in the waste water chamber 113 and is attached to the partition 1131, the drain member 131 is provided with a second drain outlet 1311, and the first drain outlet 1132 is communicated with the second drain outlet 1311 and forms a waste water outlet 1133.

Specifically, the partition 1131 includes an upper partition 1134 and a lower partition 1135, the upper partition 1134 is connected to the third end surface 1143, the lower partition 1135 is connected to the second end surface 1142, the widths of the upper partition 1134 and the lower partition 1135 are equal to the width of the waste water chamber 113, a gap exists between the upper partition 1134 and the lower partition 1135, and the existing gap forms the first water outlet 1132.

Specifically, the height of the drain member 131 is smaller than the height of the waste water chamber 113, and the width of the drain member 131 is equal to the width of the waste water chamber 113, so that the drain member 131 can reciprocate between the first direction and the second direction over the height of the waste water chamber 113. In addition, the width of the drain member 131 is set to be equal to the width of the waste water chamber 113, so that the occurrence of deflection of the drain member 131 during movement in the waste water chamber 113 can be prevented.

Specifically, the second water outlet 1311 is opened on the water outlet 131, the width of the second water outlet 1311 is smaller than the width of the first water outlet 1132, and the height of the second water outlet 1311 is equal to the first water outlet 1132, and the water outlet 131 is attached to the partition 1131. Accordingly, when the drain 131 reciprocates at the height of the waste chamber 113, the waste ports 1133 formed by the first and second drain ports 1132 and 1311 become larger or smaller.

With continued reference to fig. 3 to 5, specifically, the flexible film 12 covers the water pressure transmission hole 1111, one end of the connecting rod 13 is connected to the flexible film 12, the other end passes through the communication hole 1121 and is connected to the drainage member 131, the elastic member 14 is disposed in the movable cavity 112 and sleeved on the outer peripheral side of the connecting rod 13, and the elastic member 14 is pressed against the top surface of the movable cavity 112, i.e. the first end surface 1141.

Specifically, referring to fig. 4 to 6, the flexible film 12 is thin in the middle and thick in the periphery, and the flexible film 12 is provided in the middle so that the flexible film 12 can sense when fluctuation of the water pressure rise in the tap water chamber 111 is small, and can bulge in the direction of the movable chamber 112 to push the connecting rod 13. The flexible film 12 is arranged to be thick at the periphery, so that the connection between the periphery of the flexible film 12 and the periphery of the water pressure transmission hole 1111 is firmer, and the huge force on the flexible film 12 caused by the sudden increase of the water pressure in the tap water cavity 111 is prevented, thereby the flexible film 12 is loosened, and the sensitivity and the firmness of the flexible film 12 can be increased simultaneously.

It can be understood that when the water pressure in the tap water cavity 111 increases, the flexible film 12 pushes the connecting rod 13 to move in the first direction, the connecting rod 13 drives the water draining member 131 to move in the first direction, the waste water port 1133 gradually increases, the elastic member 14 is stressed to deform, and the water draining member 131 is finally abutted to the third end surface 1143 to stop moving; when the water pressure in the tap water chamber 111 decreases, the connecting rod 13 moves in the second direction under the resilience force of the elastic member 14, the waste water port 1133 gradually decreases, and the movement of the drain member 131 is stopped by abutting the second end surface 1142. Wherein the first direction is opposite to the second direction.

More specifically, when the drain 131 moves to abut against the top end surface of the waste water chamber 113, i.e., the third end surface 1143, the waste water port 1133 is maximized; when the drain member 131 moves to abut against the bottom end surface of the wastewater chamber, i.e., the second end surface 1142, of the wastewater chamber 113, the wastewater port 1133 is minimized.

Referring to fig. 4 to 7, the connecting rod 13 further includes a cross bar 132 and a vertical bar 133, the cross bar 132 and the vertical bar 133 are integrally formed, the cross bar 132 is connected to the flexible film 12, and the vertical bar 133 passes through the communication hole 1121 and is connected to the drain member 131. The connecting rod 13 is integrally connected with the vertical rod 133 by arranging the cross rod 132, and the cross rod 132 is connected with the flexible film 12, and the vertical rod 133 passes through the communication hole 1121 and is connected with the drainage member 131, so that the slight bulge of the flexible film 12 can push the cross rod 132 and the vertical rod 133 to move in the first direction in a labor-saving manner, and the drainage member 131 is driven to move.

Of course, the connection manner between the vertical rod 133 and the drain member 131 may be a split connection, such as any one of socket connection, groove connection, screw connection, and snap connection, which is not particularly limited in the present utility model.

In the embodiment of the utility model, the water pressure transmission hole 1111 is covered by the flexible film 12, when the water pressure in the tap water cavity 111 is increased, the flexible film 12 can bulge towards the movable cavity 112 and push the connecting rod 13 connected with the flexible film 12 to move towards the first direction, so that the waste water outlet 1133 is enlarged and the elastic piece 14 is stressed to deform; when the water pressure in the tap water chamber 111 decreases, the flexible membrane 12 does not bulge, and the connecting rod 13 moves in the second direction by the resilience force of the elastic member 14, so that the waste water port 1133 decreases. Therefore, the water-saving valve 1 can automatically adjust the size of the waste water port 1133 through the water pressure in the tap water cavity 111, the water pressure is higher to match with the larger waste water port 1133, the water pressure is lower to match with the smaller waste water port 1133, so that the pure waste water ratio can be stabilized at a higher level, and the waste water port 1133 correspondingly adjusts the size when the whole machine is switched on or the tap water pressure fluctuates, thereby preventing foreign matters from making waste water smaller Kong Dusi. The problem of among the prior art waste water valve use the waste water mouth of fixed size to carry out the drainage and lead to the running water extravagant more or lead to the waste water mouth to scale deposit easily and foreign matter jam is solved.

Alternatively, the elastic member 14 is a compression spring or a spring block, and specifically, in the embodiment of the present utility model, the elastic member 14 is a compression spring.

Further, the water saving valve 1 further includes an annular stabilizing member 15, where the annular stabilizing member 15 is disposed between the connecting rod 13 and the elastic member 14 and is connected to the top surface of the movable cavity 112, i.e. the first end surface 1141. The annular stabilizing piece 15 is arranged in the movable cavity 112, is connected to the first end face 1141 and sleeved on the outer peripheral side of the connecting rod 13, and can be used for stabilizing the elastic piece 14 and preventing the elastic piece 14 from loosening; and can also stabilize the connecting rod 13 to prevent the connecting rod 13 from deflecting during the reciprocating operation between the first direction and the second direction.

Further, the water-saving valve 1 further comprises a waterproof ring 16, and the waterproof ring 16 is sleeved on the outer peripheral side of the connecting rod 13 and is in interference fit with the annular stabilizing piece 15. By providing the waterproof ring 16, water in the waste water chamber can flow into the movable chamber from the gap between the connecting rod and the communication hole.

Optionally, the waterproof ring 16 is made of rubber or silica gel, which is not particularly limited in the present utility model.

Example two

Referring to fig. 8, a second embodiment of the present utility model discloses a filtration system 2, the filtration system 2 includes a filtration main body 21 and a water saving valve 1 in the first embodiment, the filtration main body 21 is provided with a tap water port 211, a waste water hole 212 and a water purifying port 213, the tap water cavity 111 is communicated with the tap water port 211, and the waste water hole 212 is communicated with the waste water cavity 113; tap water flows into the filtering body 21 through the tap water chamber 111 and the tap water port 211, the filtering body 21 filters the tap water, filtered waste water flows out through the waste water hole 212 and the waste water chamber 113, and filtered clean water flows out through the clean water port 213.

Further, the filter body 21 includes an RO cartridge 214.

The filtering body 21 filters tap water as a mature prior art, and the present utility model is not described in detail herein.

For convenience of understanding, the embodiment of the present utility model will be described herein with reference to the water flow path in the filtration system 2, as shown by the arrow in fig. 8, tap water flows from the tap water chamber 111 through the tap water port 211, flows from the tap water port 211 into the filtration body 21, and then is filtered by the RO filter element 214, and finally the generated wastewater flows out from the wastewater hole 212, flows out through the wastewater chamber 113, and the generated purified water flows out from the purified water port 213 to be used by a user.

The function of the filtering system 2 provided by the embodiment of the present utility model is the same as that of the water saving valve 1, and will not be described here again.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A water saving valve, characterized in that: the water-saving valve comprises a shell, a flexible film, a connecting rod and an elastic piece, wherein a tap water cavity, a movable cavity and a waste water cavity are formed in the shell, a water pressure transmission hole is formed between the tap water cavity and the movable cavity, and a communication hole is formed between the movable cavity and the waste water cavity;

the connecting rod comprises a drainage piece, a partition plate is arranged in the waste water cavity, a first drainage port is formed in the partition plate, the drainage piece is arranged in the waste water cavity and is in fit connection with the partition plate, a second drainage port is formed in the drainage piece, and the first drainage port is communicated with the second drainage port to form a waste water port;

the flexible film covers the water pressure transmission hole, one end of the connecting rod is connected with the flexible film, the other end of the connecting rod penetrates through the communication hole and is connected with the drainage piece, the elastic piece is arranged in the movable cavity and is sleeved on the periphery side of the connecting rod, and the elastic piece is stressed and abutted to the top surface of the movable cavity;

when the water pressure in the tap water cavity is increased, the flexible film pushes the connecting rod to move towards a first direction, the waste water port is increased, and the elastic piece is stressed to deform; when the water pressure in the tap water cavity is reduced, the connecting rod moves towards a second direction under the action of the resilience force of the elastic piece, the waste water port is reduced, and the first direction is opposite to the second direction.

2. The water-saving valve according to claim 1, wherein: the flexible film is thin in the middle and thick in the periphery.

3. The water-saving valve according to claim 1, wherein: the connecting rod further comprises a cross rod and a vertical rod, the cross rod and the vertical rod are integrally formed, the cross rod is connected with the flexible film, and the vertical rod penetrates through the communication hole and is connected with the drainage piece.

4. The water-saving valve according to claim 1, wherein: the height of the drainage piece is smaller than that of the waste water cavity, and the width of the drainage piece is equal to that of the waste water cavity.

5. The water-saving valve according to claim 1, wherein: when the drainage piece is abutted against the top end face of the waste water cavity, the waste water port is the largest; when the drainage piece is abutted to the bottom end face of the waste water cavity, the waste water port is minimum.

6. The water-saving valve according to claim 1, wherein: the water-saving valve further comprises an annular stabilizing piece, wherein the annular stabilizing piece is arranged between the connecting rod and the elastic piece and is connected to the top surface of the movable cavity.

7. The water-saving valve according to claim 6, wherein: the water-saving valve further comprises a waterproof ring which is sleeved on the periphery side of the connecting rod and in interference fit with the annular stabilizing piece.

8. The water-saving valve according to claim 1, wherein: the width of the first water outlet is equal to that of the waste water cavity, and the width of the second water outlet is smaller than that of the waste water cavity.

9. A filtration system, characterized by: the filtering system comprises a filtering main body and the water-saving valve as claimed in any one of claims 1 to 8, wherein the filtering main body is provided with a tap water port, a waste water hole and a water purifying port, the tap water cavity is communicated with the tap water port, and the waste water hole is communicated with the waste water cavity; tap water flows into the filtering main body through the tap water cavity and the tap water port, the filtering main body filters the tap water, filtered waste water flows out through the waste water hole and the waste water cavity, and filtered clean water flows out through the clean water port.

10. The filtration system of claim 9, wherein: the filter body includes an RO cartridge.