CN115750293A - Diaphragm pump and water purifier - Google Patents

Abstract

The application relates to a diaphragm pump and purifier, a diaphragm pump includes: a housing having a water inlet; the one-way valve is arranged in the shell and provided with a discharge cavity and a suction cavity, the suction cavity is communicated with the water inlet, the one-way valve is also provided with a drain hole used for communicating the discharge cavity with the suction cavity, and the drain hole is a waist-shaped hole extending along the circumferential direction of the one-way valve. A purifier includes foretell diaphragm pump. According to the diaphragm pump and the water purifier, the one-way valve is provided with the drain hole for communicating the discharge cavity with the suction cavity, and the drain hole is a waist-shaped hole extending along the circumferential direction of the one-way valve, so that the water outlet pressure of water flowing from the suction cavity to the discharge cavity can be reduced, and the flowing noise of the water flowing in the diaphragm pump can be further reduced; the streamline is more smooth and more stable when rivers flow to the discharge chamber by inhaling the chamber, reduces the production of vortex, is favorable to promoting the play water flow of diaphragm pump.

Description

Diaphragm pump and water purifier

Technical Field

The application relates to the technical field of water purification equipment, in particular to a diaphragm pump and a water purifier.

Background

In the process of purifying raw water by the water purifier, the diaphragm pump is used for providing certain pressure for the raw water, so that the raw water overcomes the resistance of the reverse osmosis membrane and efficiently flows through the reverse osmosis membrane, and the raw water is purified and filtered by the reverse osmosis membrane.

The existing diaphragm pump can generate certain vibration due to the operation of a motor in the operation process, and the friction noise and vortex of water flow are easily generated due to the unreasonable internal structure design of the diaphragm pump, so that the water flow and the water pressure of the diaphragm pump can be influenced, and the working efficiency of the diaphragm pump is low.

Disclosure of Invention

Accordingly, it is necessary to provide a diaphragm pump and a water purifier in order to solve the problem that the conventional diaphragm pump is likely to generate frictional noise and vortex of water flow.

A diaphragm pump, comprising:

a housing having a water inlet;

the one-way valve is arranged in the shell and provided with a discharge cavity and a suction cavity, the suction cavity is communicated with the water inlet, the one-way valve is also provided with a drain hole used for communicating the discharge cavity with the suction cavity, and the drain hole is a waist-shaped hole extending along the circumferential direction of the one-way valve.

In the diaphragm pump, the one-way valve is provided with the drain hole for communicating the discharge cavity with the suction cavity, and the drain hole is a waist-shaped hole extending along the circumferential direction of the one-way valve, so that the water outlet pressure of water flowing from the suction cavity to the discharge cavity can be reduced, and the flowing noise of the water in the diaphragm pump is further reduced; the streamline is more smooth and more stable when rivers flow to the discharge chamber by inhaling the chamber, reduces the production of vortex, is favorable to promoting the play water flow of diaphragm pump.

In one embodiment, the drain hole comprises a first hole section at the end and a second hole section connected with the first hole section, and the length of the first hole section is smaller than that of the second hole section.

In one embodiment, the first hole section and the second hole section are both circular arc sections, the radius of the first hole section is at least 1.0mm, and the radius of the second hole section is at least 8.5mm.

In one embodiment, the open area of the drain hole is 10mm ² ～20mm ² 。

In one embodiment, the check valve has a plurality of the drain holes, and all the drain holes are circumferentially and uniformly distributed by taking the center of the check valve as a circle center.

In one embodiment, at least two circles of the drainage holes are arranged along the radial direction of the one-way valve, and the drainage holes of every two adjacent circles are equally spaced in the radial direction of the one-way valve.

In one embodiment, the open area of each drain hole located in different circles is gradually increased from the center of the check valve to the outer edge of the check valve.

In one embodiment, the valve body is provided with one discharge cavity and a plurality of suction cavities, the discharge cavity is located in the middle of the valve body, the suction cavities are circumferentially and uniformly distributed by taking the discharge cavity as a center, and the number of all the suction cavities is equal to that of the drain holes in each circle.

In one embodiment, the check valve comprises a valve body and a valve core, wherein a mounting hole for the valve core to penetrate through is formed in the middle of the valve body, and the discharge cavity and the suction cavity are formed in different sides of the valve body.

In one embodiment, the valve body has the drain hole and a water inlet hole, and the water inlet hole is used for communicating the suction cavity and the water inlet.

In one embodiment, each suction cavity is correspondingly provided with a plurality of water inlet holes, and all the water inlet holes are circumferentially distributed along the circumferential direction of the suction cavity.

A purifier includes foretell diaphragm pump.

Foretell purifier can reduce the rivers noise that flows in the diaphragm pump, and the streamline is more smooth and easy and stable when rivers are discharged the chamber by the suction chamber flow direction, reduces the production of vortex, is favorable to promoting the play water flow of diaphragm pump.

Drawings

FIG. 1 is a schematic view of a diaphragm pump in one embodiment;

FIG. 2 is a top view of the diaphragm pump of FIG. 1;

FIG. 3 is a schematic view of a valve body in the diaphragm pump of FIG. 1;

FIG. 4 is a top view of the valve body shown in FIG. 3;

fig. 5 is a partial top view of a valve body in another embodiment.

Reference numerals:

100. a housing; 101. a water inlet; 102. a water outlet; 200. a one-way valve; 201. a discharge chamber; 202. a suction chamber; 203. a drain hole; 204. a first bore section; 205. a second bore section; 205a, inner arc; 205b, outer arc; 206. a water inlet hole; 210. a valve body; 211. and (7) installing holes.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In this application, unless expressly stated or limited otherwise, the terms "initially", "connected", "secured", and the like are to be construed broadly and can include, for example, fixedly connected, releasably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. 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. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

Referring to fig. 1, an embodiment of a water purifier includes a diaphragm pump.

Specifically, the purifier includes the casing and locates inside water route board, diaphragm pump and the filter element group spare of casing etc. and constitute circulation circuit through the pipeline intercommunication between above-mentioned each part to play the purification effect to the rivers in the water route. Wherein, the diaphragm pump is mainly used for providing power for the water flow operation in the water way. For example, the filter element assembly may be a reverse osmosis membrane having a resistance to water flow, and the diaphragm pump is disposed upstream of the reverse osmosis membrane to provide power for water flow through the reverse osmosis membrane, such that the water flow overcomes the resistance of the reverse osmosis membrane and efficiently flows through the reverse osmosis membrane.

Current diaphragm pump is at the operation in-process, because the motor operation can produce certain vibration to because diaphragm pump inner structure design is unreasonable, produce the frictional noise and the vortex of rivers easily, can influence the play water flow and the play water pressure of diaphragm pump, lead to the work efficiency of diaphragm pump lower.

Based on the consideration, a diaphragm pump and a water purifier are designed, wherein a drain hole 203 of the diaphragm pump is a kidney-shaped hole extending along the circumferential direction of the one-way valve 200, so that the water outlet pressure when water flows from the suction cavity 202 to the discharge cavity 201 can be reduced, and the flow noise of the water flow in the diaphragm pump is further reduced; the streamline is more smooth and stable when rivers flow to discharge chamber 201 by inhaling chamber 202, reduces the production of vortex, is favorable to promoting the play water flow of diaphragm pump.

Referring to fig. 1 and 2, an embodiment of a diaphragm pump includes a housing 100 and a check valve 200, the housing 100 has a water inlet 101, and referring to fig. 3, the check valve 200 is disposed inside the housing 100 and has a discharge chamber 201 and a suction chamber 202, the suction chamber 202 is communicated with the water inlet 101, the check valve 200 further has a drain hole 203 for communicating the discharge chamber 201 and the suction chamber 202, and the drain hole 203 is a kidney-shaped hole extending along a circumferential direction of the check valve 200.

It should be noted that the discharge chamber 201 and the suction chamber 202 are located on different sides of the check valve 200, and the housing 100 further includes a water outlet 102 communicating with the discharge chamber 201. When the purifier is in a water purification state, water flows into the housing 100 through the water inlet 101 and flows into the suction cavity 202, the water flows out of the discharge cavity 201 through the water discharge hole 203 after being pressurized in the suction cavity 202, and finally flows to the water outlet 102 through the discharge cavity 201, so that the function of pressurizing the water flow is realized.

In the diaphragm pump, the check valve 200 is provided with the drain hole 203 for communicating the discharge cavity 201 and the suction cavity 202, and the drain hole 203 is a waist-shaped hole extending along the circumferential direction of the check valve 200, so that the water outlet pressure when water flows from the suction cavity 202 to the discharge cavity 201 can be reduced, and the flow noise of the water flow in the diaphragm pump can be further reduced; the streamline is more smooth and more stable when rivers flow to discharge chamber 201 by inhaling chamber 202, reduces the production of vortex, is favorable to promoting the play water flow of diaphragm pump.

In this embodiment, referring to fig. 1, the number of the water inlets 101 and the number of the water outlets 102 are both one, and the water inlets 101 and the water outlets 102 are disposed opposite to each other. In other embodiments, the number of the water inlets 101 and the water outlets 102 may also be at least two, and all the water inlets 101 and the water outlets 102 may be disposed on the same side or different sides of the casing 100.

In this embodiment, the casing 100 has an opening at the bottom of the casing 100, and the check valve 200 is disposed at the opening and sealed with the opening to prevent water from flowing out through the gap between the casing 100 and the check valve 200. The check valve 200 and the housing 100 may be locked by inserting, clamping or bolting.

In some embodiments of the present application, referring to fig. 4 and 5, the drainage hole 203 includes a first hole section 204 at an end portion and a second hole section 205 connected to at least one side of the first hole section 204, and a length of the first hole section 204 is smaller than a length of the second hole section 205.

Here, the length of the first hole segment 204 is a connection line of two end points of the first hole segment 204, and the length of the second hole segment 205 is a connection line of two end points of the second hole segment 205. Through the arrangement, the drain hole 203 is a kidney-shaped hole extending along the circumferential direction of the check valve 200, the water outlet area of the drain hole 203 is increased, and the water outlet stability of the drain hole 203 is improved.

In some embodiments of the present application, referring to fig. 4 and 5, the first hole segment 204 and the second hole segment 205 are both circular arc segments, the radius of the first hole segment 204 is at least 1.0mm, and the radius of the second hole segment 205 is at least 8.5mm.

Here, the second hole segment 205 includes an inner circular arc 205a and an outer circular arc 205b, two ends of the inner circular arc 205a and the outer circular arc 205b are respectively connected to one first hole segment 204, and the radius of the second hole segment 205 is a radius corresponding to the outer circular arc 205 b.

It can be understood that if the radius of the first hole section 204 and the second hole section 205 is too small, the pressure of the water flowing through the circular arc section will be increased, and the friction noise of the water flowing through the diaphragm pump will be increased; if the radius of the first hole section 204 and the radius of the second hole section 205 are too large, a vortex is easily generated when the water flows through the circular arc section, and the pressure drop of the water flow flowing through the diaphragm pump is increased. Through the setting, through the radius of restriction first hole section 204 and second hole section 205 to set the shape of wash port 203 as the optimum, reduce the frictional noise of rivers through the diaphragm pump, reduce the pressure drop of rivers through the diaphragm pump simultaneously, be favorable to ensureing the play water flow and the play water pressure of diaphragm pump.

It should be noted that, in other embodiments, the first hole section 204 and the second hole section 205 may be both straight line segments.

In some embodiments of the present application, referring to FIG. 4, the drainage holes 203 have an open area of 10mm ² ～20mm ² 。

It can be understood that if the opening area of the drain hole 203 is too small, the pressure of the water flowing through the drain hole 203 will be increased, and the friction noise of the water flowing through the diaphragm pump will be increased; if the opening area of the drain hole 203 is too large, a vortex is easily generated when the water flows through the drain hole 203, and the pressure drop of the water flowing through the diaphragm pump is increased. With the above arrangement, the opening area of the drain hole 203 is limited to 10mm ² ～20mm ² The vortex intensity can be reduced, the frictional noise of rivers flowing through the diaphragm pump is reduced, the pressure drop of rivers flowing through the diaphragm pump is reduced simultaneously, and the water flow and the water pressure of guaranteeing the diaphragm pump are facilitated.

It should be noted that in other embodiments, the opening area of the drainage hole 203 may be designed to be in other value ranges according to requirements.

In some embodiments of the present application, referring to fig. 4, the check valve 200 has a plurality of drainage holes 203, and all the drainage holes 203 are circumferentially and uniformly distributed around the center of the check valve 200.

Here, the unidirectional flow is understood to mean that the water flow only flows from the suction chamber 202 to the discharge chamber 201, but cannot flow from the discharge chamber 201 to the suction chamber 202, so as to ensure that the diaphragm pump provides sufficient power for the water flow to operate. Through the arrangement, all the drain holes 203 are annularly and uniformly distributed by taking the center of the check valve 200 as a circle center, so that water flow is more concentrated, the water outlet area of the water flow is increased, and the function of pressurizing the diaphragm pump is realized.

In the present embodiment, the shapes and sizes of all the drain holes 203 are completely the same. For example, referring to fig. 4, all the drainage holes 203 are waist-shaped holes, and the opening areas of all the drainage holes 203 are equal. In other embodiments, the shapes and sizes of all the drainage holes 203 may not be completely the same or completely different. For example, all the drainage holes 203 may be formed by a combination of a kidney-shaped hole and a circular hole, that is, a part of the drainage holes 203 is kidney-shaped, and the other part of the drainage holes 203 is circular hole.

In some embodiments of the present application, referring to fig. 5, at least two circles of the drainage holes 203 are provided along the radial direction of the check valve 200, and the drainage holes 203 of each two adjacent circles are equally spaced in the radial direction of the check valve 200.

Here, the radial direction of the check valve 200 is the X direction shown in fig. 5. With the above arrangement, the distances between the drain holes 203 of the adjacent turns in the radial direction of the check valve 200 are made equal, and the flow of the water flowing through the drain holes 203 into the drain chamber 201 is stabilized.

For example, referring to fig. 5, three circles of drainage holes 203 are formed along the radial direction of the check valve 200, and each circle has four drainage holes 203 circumferentially and uniformly distributed around the center of the check valve 200. The three circles of drain holes 203 are respectively a first circle, a second circle and a third circle, the first circle is an inner circle closest to the mounting hole 211, the third circle is an outer circle farthest from the mounting hole 211, the second circle is located between the first circle and the third circle, and the distance between the first circle and the second circle in the radial direction of the check valve 200 is equal to the distance between the second circle and the third circle in the radial direction of the check valve 200.

In this embodiment, the shapes and sizes of the drain holes 203 located in the same circle are completely the same. For example, referring to fig. 5, the four drainage holes 203 in the same circle are all shaped like a kidney, and the opening areas of the four drainage holes 203 are all equal. In other embodiments, the shapes and sizes of the drain holes 203 in the same circle may not be completely the same or completely different. For example, referring to fig. 5, the four drainage holes 203 in the same circle may be arranged by a combination of a kidney-shaped hole and a circular hole, that is, a part of the drainage holes 203 is kidney-shaped, and another part of the drainage holes 203 is circular hole.

In some embodiments of the present application, referring to fig. 1, the open area of each of the drainage holes 203 located at different circles is gradually increased from the center of the check valve 200 to the outer edge of the check valve 200.

The gradual increase may be linear or non-linear. Through the arrangement, the opening area of the drain hole 203 is gradually increased from inside to outside, and on the basis of increasing the water outlet area of the check valve 200, the water flow flowing to the drain cavity 201 through the drain hole 203 is more stable, and the strength of the vortex is reduced.

For example, referring to fig. 5, three circles of drainage holes 203 are formed along the radial direction of the check valve 200, and each circle has four drainage holes 203 circumferentially and uniformly distributed around the center of the check valve 200. The three circles of the drain holes 203 are respectively a first circle, a second circle and a third circle, the first circle is the innermost circle close to the center of the check valve 200, the third circle is the outermost circle far away from the center of the check valve 200, and the opening area of the drain holes 203 is gradually increased from the first circle to the third circle.

In the present embodiment, the opening areas of the drain holes 203 located in the same circle are all equal. For example, referring to fig. 5, the opening areas of the four drainage holes 203 in the same circle are all equal. In other embodiments, the open areas on the same turn may also be unequal. For example, referring to fig. 5, the four drainage holes 203 in the same circle may be a combination of a kidney-shaped hole and a circular hole, so that the four drainage holes 203 have different opening areas.

In some embodiments of the present application, referring to fig. 4, the check valve 200 has a discharge chamber 201 and a plurality of suction chambers 202, the discharge chamber 201 is located in the middle of the check valve 200, the suction chambers 202 are circumferentially and uniformly distributed around the discharge chamber 201, and the number of all the suction chambers 202 is equal to the number of the drainage holes 203 in each circle.

Here, by making the number of all the suction chambers 202 equal to the number of the drain holes 203 per circle, the water flow can flow from any suction chamber 202 to the drain chamber 201 through a corresponding one of the drain holes 203, thereby better ensuring the stability of the discharged water and enhancing the pressurizing effect of the diaphragm pump.

For example, referring to fig. 4, the check valve 200 has a discharge chamber 201 and four suction chambers 202, and the four suction chambers 202 are circumferentially and uniformly distributed around the discharge chamber 201. The check valve 200 is provided with three circles of drain holes 203, and each circle is provided with four drain holes 203 which are circumferentially and uniformly distributed, that is, each suction cavity 202 is arranged corresponding to one drain hole 203. When the purifier is in a water purification state, water flows into the interior of the housing 100 through the water inlet 101 and flows into the suction cavities 202, and the water flows out to the discharge cavity 201 through the corresponding drain holes 203 after being pressurized in any suction cavity 202, and finally flows to the water outlet 102 through the discharge cavity 201.

In the present embodiment, all the suction chambers 202 have the same size, which is favorable for ensuring the water inflow and the water inflow stability of each suction chamber 202. In other embodiments, the size and shape of all of the suction chambers 202 may not be exactly the same.

In some embodiments of the present application, please refer to fig. 4, the check valve 200 includes a valve body 210 and a valve core, a mounting hole 211 for the valve core to pass through is formed in the middle of the valve body 210, and a discharge cavity 201 and a suction cavity 202 are formed on different sides of the valve body 210.

It should be noted that the valve core is movably disposed on the valve body 210, and the opening and closing of the drain hole 203 can be realized by driving the valve core to move, so that the suction chamber 202 and the discharge chamber 201 are blocked or communicated. For example, when the water purifier is not used, the valve core is located at the first position, the drain hole 203 is in a closed state, and the suction cavity 202 and the discharge cavity 201 are not communicated; when the water purifier is in a water purifying state, the valve core is driven to be switched from the first position to the second position, the drain hole 203 is in an open state, the suction cavity 202 is communicated with the discharge cavity 201, and water flow in the suction cavity 202 can flow into the discharge cavity 201 through the drain hole 203 after being pressurized.

In this embodiment, the mounting hole 211 is circular to fit the valve cartridge. In other embodiments, the mounting holes 211 may also be square or other shapes. Here, the shape of the mounting hole 211 is not particularly limited.

In this embodiment, the valve body 210 and the valve core are of a split structure, and the valve body 210 and the valve core are detachably connected. In other embodiments, the valve body 210 and the valve core may be integrated, so that they have good integrity and are convenient to be quickly assembled and disassembled.

In some embodiments of the present application, referring to fig. 4, the valve body 210 has a drain hole 203 and a water inlet hole 206, and the water inlet hole 206 is used for communicating the suction chamber 202 and the water inlet 101.

Here, when the purifying member is in the purifying state, water flow is input into the casing 100 through the water inlet 101, flows into the suction cavity 202 of the check valve 200 through the water inlet 206, is pressurized in the suction cavity 202, flows out to the discharge cavity 201 through the water discharge hole 203, and flows out through the water outlet 102 of the casing 100, so as to realize the function of pressurizing the water flow.

In some embodiments of the present application, please refer to fig. 4, each suction chamber 202 is correspondingly provided with a plurality of water inlets 206, and all the water inlets 206 are circumferentially distributed along the circumferential direction of the suction chamber 202.

Specifically, the circumferential direction of the suction chamber 202 is arcuate. Through the above arrangement, all the water inlets 206 are circumferentially distributed along the circumferential direction of the suction cavity 202, so that water entering the inside of the casing 100 can rapidly flow into the suction cavity 202 through the water inlets 206.

It should be noted that, in other embodiments, the plurality of water inlets 206 corresponding to each suction cavity 202 may also be in a rectangular array or other arrangement.

In this embodiment, all the water inlets 206 are circular, and the apertures of all the water inlets 206 are equal. In other embodiments, the sizes of all the water inlets 206 may not be completely equal.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.

Claims (12)

1. A diaphragm pump, comprising:

a housing (100) having a water inlet (101);

the one-way valve (200) is arranged in the shell (100) and provided with a discharge cavity (201) and a suction cavity (202), the suction cavity (202) is communicated with the water inlet (101), the one-way valve (200) is further provided with a drain hole (203) used for communicating the discharge cavity (201) with the suction cavity (202), and the drain hole (203) is a kidney-shaped hole extending along the circumferential direction of the one-way valve (200).

2. A membrane pump according to claim 1, characterized in that the drain hole (203) comprises a first bore section (204) at the end and a second bore section (205) connected to at least one side of the first bore section (204), the length of the first bore section (204) being smaller than the length of the second bore section (205).

3. The diaphragm pump according to claim 2, characterized in that the first orifice section (204) and the second orifice section (205) are both circular arc sections, the radius of the first orifice section (204) being at least 1.0mm and the radius of the second orifice section (205) being at least 8.5mm.

4. The diaphragm pump according to claim 1, wherein the open area of the drain hole (203) is 10mm ² ～20mm ² 。

5. The diaphragm pump according to claim 1, wherein the check valve (200) has a number of said drain holes (203), all of said drain holes (203) being circumferentially equispaced around the center of the check valve (200).

6. A membrane pump according to claim 5, characterized in that there are at least two turns of the drain hole (203) in the radial direction of the non return valve (200), the drain holes (203) of each two adjacent turns being equally spaced in the radial direction of the non return valve (200).

7. The diaphragm pump according to claim 6, characterized in that the open area of each of the drain holes (203) located at different turns increases gradually from the center of the check valve (200) to the outer edge of the check valve (200).

8. A membrane pump according to claim 6, characterized in that said one-way valve (200) has one said discharge chamber (201) and a number of said suction chambers (202), said discharge chamber (201) being located in the middle of said one-way valve (200), said suction chambers (202) being circumferentially distributed around said discharge chamber (201), the number of all said suction chambers (202) being equal to the number of said drain holes (203) per turn.

9. The diaphragm pump according to claim 1, wherein the check valve (200) comprises a valve body (210) and a valve core, a mounting hole (211) for the valve core to penetrate through is formed in the middle of the valve body (210), and the discharge cavity (201) and the suction cavity (202) are formed in different sides of the valve body (210).

10. The diaphragm pump according to claim 9, wherein the valve body (210) has the drain hole (203) and a water inlet hole (206), the water inlet hole (206) being used for communicating the suction chamber (202) and the water inlet (101).

11. The diaphragm pump according to claim 10, wherein each of said suction chambers (202) is provided with a plurality of said water inlet holes (206), and all said water inlet holes (206) are circumferentially distributed along a circumferential direction of said suction chamber (202).

12. A water purification machine comprising a membrane pump according to any of claims 1-11.

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