CN215805082U - Miniature water pump - Google Patents

Abstract

The utility model relates to a micro water pump, which comprises a base, a main diaphragm fixing seat, a compression window, a water inlet and outlet cover, a main diaphragm for controlling the water inlet and outlet of the water inlet and outlet cover, an umbrella valve, a water inlet and outlet diaphragm and a motor driving assembly, wherein the main diaphragm, the umbrella valve, the water inlet and outlet diaphragm and the motor driving assembly are sequentially connected and fixed; the water inlet and outlet cover is embedded with a one-way valve at the position of the water outlet pipe to limit the water inlet of the water outlet pipe. The utility model utilizes the structural characteristics of the one-way valve, so that on one hand, water at the position of the water outlet pipe can be prevented from flowing back to the position of the water inlet pipe, and further the pollution is avoided; on the other hand, the micro water pump can prevent the water outlet pipe of the water inlet and outlet cover from leaking, so that the micro water pump has the function of drip prevention when being applied to a system pipeline.

Description

Miniature water pump

Technical Field

The utility model belongs to the technical field related to flow control, and particularly relates to a micro water pump.

Background

At present, the existing micro water pump usually selects an umbrella valve to control the water inlet and outlet of the water inlet and outlet cover, and specifically uses the umbrella cover on the umbrella valve to respectively support against the water inlet and outlet on the compression window, so as to achieve the water inlet and outlet control of the water inlet and outlet on the compression window.

It can be understood that when the umbrella cover on the umbrella valve acts on the position of the water outlet of the compression window, the one-way conduction of the water outlet on the compression window can be realized. However, the umbrella valve is an umbrella-shaped diaphragm, the whole material has certain elasticity, and uncertainty exists in the assembly of the umbrella valve on the compression window, so that when the micro water pump is applied to a system pipeline for use, when the micro water pump stands still and the water level of the position of the water inlet pipe on the water inlet and outlet cover is higher than the water level of the position of the water outlet pipe, a height difference exists between the micro water pump and the water inlet and outlet cover and a water pressure difference is generated, and the micro water pump is caused to drip at the position of the water outlet pipe; on the other hand, the water inlet pipe and the water outlet pipe on the water inlet and outlet cover can generate siphon phenomenon, so that the position of the water outlet pipe on the water inlet and outlet cover can flow back to the position of the water inlet pipe, and pollution is caused.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a micro water pump to solve the technical problems in the prior art.

The miniature water pump comprises a base, a main diaphragm fixing seat, a compression window, a water inlet and outlet cover, a main diaphragm, an umbrella valve, a water inlet and outlet diaphragm and a motor driving assembly, wherein the main diaphragm, the umbrella valve, the water inlet and outlet diaphragm and the motor driving assembly are sequentially connected and fixed; and the water inlet and outlet cover is provided with a one-way valve at the position of the water outlet pipe so as to limit the water inlet of the water outlet pipe.

In the utility model, the water inlet of the water outlet pipe is avoided by arranging the one-way valve on the water outlet pipe and utilizing the structural characteristics of the one-way valve, so that on one hand, the siphon phenomenon of the micro water pump on the water inlet and outlet cover can be avoided, the water at the position of the water outlet pipe is prevented from flowing back to the position of the water inlet pipe, and the pollution is avoided; on the other hand, the miniature water pump can stand still, and when a certain water pressure difference is generated between the water inlet pipe and the water outlet pipe on the water inlet and outlet cover due to the height difference, water can be discharged due to the fact that the water outlet pipe needs to overcome the self pressure of the one-way valve, so that the position of the water outlet pipe of the water inlet and outlet cover can be prevented from being dripped, and the miniature water pump has the function of drip prevention when being applied to a system pipeline.

As a preferable scheme of the present invention, the check valve includes a built-in valve cover fixedly connected to the water outlet pipe, a check head matched with the built-in valve cover, and a check head spring, the water outlet pipe is inwardly formed with a step, one end of the check head spring abuts against the step, the other end of the check head spring is sleeved on the check head, and the check head spring can push the check head to abut against the built-in valve cover so as to block a water outlet channel of the built-in valve cover.

In the utility model, the one-way valve is set to be a matching structure of the built-in valve cover, the check head and the check head spring, so that the one-way valve can be made of local materials, the production and assembly of the one-way valve are facilitated, and the function of reducing the overall production cost of the miniature water pump is achieved.

In a preferred aspect of the present invention, an end surface of the check head facing the built-in valve cover is an arc-shaped convex surface, and the arc-shaped convex surface can abut against a passage port of the built-in valve cover to block a water outlet passage of the built-in valve cover.

In the utility model, the sealing surface of the check head matched with the built-in valve cover is set to be an arc convex surface, so that the check head is abutted against the built-in valve cover in an inclined mode to realize the plugging of the water outlet channel on the built-in valve cover, thereby ensuring the sealing effect on the water outlet channel on the built-in valve cover when the check head is matched with the built-in valve cover.

As a preferable scheme of the utility model, the outer peripheral wall of the check head is connected with a plurality of extending convex columns, wherein one end of each extending convex column far away from the check head abuts against the inner wall of the water outlet pipe respectively.

In the utility model, through the structural arrangement of the extension convex column, the resistance of the contact surface between the check head and the water outlet pipe is reduced when the check head moves relative to the water outlet pipe, and the stability of the check head in the movement of the water outlet pipe is further improved.

As a preferable aspect of the present invention, the built-in valve cap is fitted to the outlet pipe in an interference fit manner.

In the utility model, the built-in valve cover is assembled in the water outlet pipe in an interference fit mode, so that the built-in valve cover is conveniently assembled on the water outlet pipe.

As a preferable scheme of the present invention, two limiting lugs are disposed on the outer peripheral wall of the internal valve cover, two grooves matched with the limiting lugs are disposed on the pipe wall of the water outlet pipe, and the assembly position of the internal valve cover on the water outlet pipe can be determined by the abutting fit between the limiting lugs and the groove bottoms of the grooves.

According to the utility model, the position of the built-in valve cover in the water outlet pipe can be determined by the abutting fit between the upper limiting lug of the built-in valve cover and the bottom of the groove in the water outlet pipe, so that the built-in valve cover can be further conveniently assembled in the water outlet pipe.

As a preferred scheme of the utility model, the water inlet and outlet membrane is embedded between the compression window and the water inlet and outlet cover so as to assemble and seal the compression window and the water inlet and outlet cover; the water inlet and outlet membrane is provided with an ear lobe matched with the water outlet in the compression window, and the ear lobe is attached to the compression window to block the water outlet in the compression window.

In the utility model, through the reasonable structural arrangement of the water inlet and outlet diaphragm, when the micro water pump does not discharge water, no interaction force exists between the ear lobe of the water inlet and outlet diaphragm and the compression window, so that the water inlet and outlet diaphragm and the compression window are prevented from being adhered, the normal water discharge of the micro water pump during working is ensured, and the effect of prolonging the service life of the micro water pump is achieved; meanwhile, the water inlet and outlet diaphragm is assembled at the position between the compression window and the water inlet and outlet cover, the compression window and the water inlet and outlet cover can be directly assembled and sealed, the compression window and the water inlet and outlet cover are prevented from being sealed by other modes, and the miniature water pump has the effect of reducing the production cost of the miniature water pump.

As a preferred scheme of the present invention, a circle of sealing ribs is disposed on the water inlet/outlet membrane between the compression window and the water inlet/outlet cover, and the compression window or the water inlet/outlet cover can act on the sealing ribs to squeeze the sealing ribs to deform.

In the utility model, the assembly and sealing between the compression window and the water inlet and outlet cover are realized by utilizing the deformation of the sealing convex rib on the water inlet and outlet membrane sheet, so that the water inlet and outlet membrane sheet is convenient to assemble and seal the water inlet and outlet cover and the compression window, and the water inlet and outlet membrane sheet has the effects of simplifying the structure and facilitating the assembly.

As a preferable aspect of the present invention, the number of the ear lobes is two, and one end surface of each of the two ear lobes facing the compression window and one end surface of each of the water inlet/outlet membrane facing the compression window are disposed on the same plane.

In the utility model, the reasonable position of the ear flap on the water inlet and outlet membrane is utilized, so that the water inlet and outlet membrane assembled on the compression window can realize the plugging of the ear flap on the water outlet on the compression window, thus the ear flap can be separated from the water outlet on the compression window once being stressed, and the miniature water pump is convenient for water outlet during working.

As a preferable scheme of the present invention, the water inlet and outlet cover is provided with a flow restrictor on the water inlet pipe and/or the water outlet pipe.

In the utility model, the flow limiter can be used for realizing the flow regulation of the inlet water of the inlet pipe and/or the outlet water of the outlet pipe on the inlet and outlet water covers, so that the micro water pump can select the flow limiters with different calibers according to different use requirements, and the micro water pump can be suitable for the regulation of different flows.

Drawings

Fig. 1 is an exploded view of a micro water pump according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of a micro water pump according to an embodiment of the present invention.

FIG. 3 is a sectional view of the check valve of the present invention assembled on the outlet pipe of the inlet and outlet cover.

Fig. 4 is a schematic structural view of the check head of the present invention.

Fig. 5, fig. 6 and fig. 7 are schematic structural views of different embodiments of the water inlet and outlet membrane of the utility model.

FIG. 8 is a schematic view of the compression window of the present invention.

Wherein, 11, the base; 12. a main diaphragm fixing seat; 13. compressing the window; 131. a water outlet; 132. a water inlet; 14. a water inlet and outlet cover; 141. a water inlet pipe; 142. a water outlet pipe; 1421. a step; 1422. a groove; 21. a main diaphragm; 22. an umbrella valve; 23. a water inlet and outlet membrane; 231. an ear lobe; 232. sealing the convex ribs; 233. a square through groove; 234. connecting ribs; 31. a motor; 32. a cam; 33. a support; 34. a core rod; 41. a valve cover is arranged inside; 411. a water outlet channel; 412. a limiting lug; 42. a check head; 421. an arc-shaped convex surface; 422. extending the convex column; 43. a check head spring; 101. a water inlet cavity; 200. a flow restrictor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

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 invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

Referring to fig. 1 to 8, a micro water pump according to an embodiment of the present invention includes a base 11, a main diaphragm fixing seat 12, a compression window 13, a water inlet/outlet cover 14, a main diaphragm 21 for controlling water inlet/outlet of the water inlet/outlet cover 14, an umbrella valve 22, a water inlet/outlet diaphragm 23, and a motor driving assembly, which are sequentially connected and fixed.

The upper inlet outlet cover 14 of the micro water pump of the present embodiment includes an inlet pipe 141 and an outlet pipe 142. In this embodiment, the water inlet and outlet cover 14 of this embodiment is provided with a one-way valve at the position of the water outlet pipe 142 to limit the water inlet of the water outlet pipe 142. The micro water pump can avoid water from entering the water outlet pipe 142 by utilizing the structural characteristics of the one-way valve, so that on one hand, the siphon phenomenon of the micro water pump on the water inlet and outlet cover 14 can be avoided, water at the position of the water outlet pipe 142 is prevented from flowing back to the position of the water inlet pipe 141, and the pollution is avoided; on the other hand, when the micro water pump stands still and a certain water pressure difference is generated between the water inlet pipe 141 and the water outlet pipe 142 of the water inlet and outlet cover 14 due to the height difference, water can be discharged only when the water outlet pipe 142 needs to overcome the self pressure of the one-way valve, so that the water dripping at the position of the water outlet pipe 142 of the water inlet and outlet cover 14 can be prevented, and the micro water pump has a function of drip prevention when being applied to a system pipeline. It should be noted that, the micro water pump is applied to a system pipeline, and a water path where the water inlet pipe 141 or the water outlet pipe 142 is located on the water inlet and outlet cover 14 is cut off according to a use requirement, so that a water pressure difference is generated between the water inlet pipe 141 and the water outlet pipe 142 due to a height difference, for example, the micro water pump is applied to a garment steamer, a sweeping robot, and the like, and the description is not provided herein.

Specifically, the check valve of the present embodiment includes a built-in valve cap 41 fixedly connected to the water outlet pipe 142, a check head 42 matched with the built-in valve cap 41, and a check head spring 43, wherein a step 1421 is formed inward on the water outlet pipe 142 of the water inlet and outlet cover 14, one end of the check head spring 43 abuts against the step 1421, the other end is sleeved on the check head 42, and the check head spring 43 can push the check head 42 to abut against the built-in valve cap 41 to plug the water outlet channel 411 of the built-in valve cap 41, so as to realize the control of the check valve on the one-way conduction of the water outlet pipe 142.

It can be understood that, in the micro-water pump of the embodiment, the check valve is designed to be the matching structure of the built-in valve cover 41, the check head 42 and the check head spring 43, so that the check valve can be made of local materials, the production and assembly of the check valve are facilitated, and the effect of reducing the overall production cost of the micro-water pump is achieved.

The built-in valve cover 41 of the present embodiment is assembled on the water outlet pipe 142 in an interference fit manner, so that the built-in valve cover 41 is assembled on the water outlet pipe 142 conveniently.

Further, two limiting lugs 412 are arranged on the outer peripheral wall of the internal valve cover 41 of the present embodiment, two grooves 1422 matched with the limiting lugs 412 are arranged on the pipe wall of the water outlet pipe 142, and the assembling position of the internal valve cover 41 on the water outlet pipe 142 can be determined by the abutting fit between the limiting lugs 412 and the groove bottoms of the grooves 1422. When the internal valve cap 41 is assembled into the water outlet pipe 142 in the present embodiment, the positioning lug 412 on the internal valve cap 41 is in abutting fit with the bottom of the groove 1422 on the water outlet pipe 142, so as to determine the position of the internal valve cap 41 in the water outlet pipe 142, and further facilitate the assembly of the internal valve cap 41 in the water outlet pipe 142.

In the check head 42 of the present embodiment, an end surface of the check head facing the inner valve cover 41 is formed as an arcuate convex surface 421, and the arcuate convex surface 421 can abut on the passage opening of the inner valve cover 41 to close the water outlet passage 411 of the inner valve cover 41. That is, in the micro-water pump of the present embodiment, the sealing surface where the check head 42 is engaged with the internal valve cover 41 is the arc-shaped convex surface 421, so that the check head 42 is abutted to the internal valve cover 41 in an inclined manner, and the water outlet passage 411 of the internal valve cover 41 can be closed, thereby ensuring the sealing effect of the water outlet passage 411 of the internal valve cover 41 when the check head 42 is engaged with the internal valve cover 41.

The outer circumferential wall of the check head 42 of the present embodiment is connected to a plurality of extending studs 422, wherein one end of each extending stud 422 far away from the check head 42 abuts against the inner wall of the water outlet pipe 142. That is to say, the check head 42 of the present embodiment is disposed in the water outlet pipe 142, and specifically, the extended protruding pillar 422 of the check head 42 is in contact with the inner wall of the water outlet pipe 142, so as to reduce the contact area when the check head 42 is in contact with the inner wall of the water outlet pipe 142, reduce the resistance of the contact surface between the check head 42 and the water outlet pipe 142 when the check head 42 moves relative to the water outlet pipe 142, and further improve the stability of the check head 42 when moving in the water outlet pipe 142. It should be noted that the end surface of the extended convex column 422 in the present embodiment contacting the inner wall of the water outlet pipe 142 is an arc surface, and the extended convex column 422 and the check head 42 are an integrated structure, which will not be described herein.

In this embodiment, the compression window 13 of this embodiment is matched with the main diaphragm 21 and forms two water inlet cavities 101, the compression window 13 is respectively provided with one water outlet 131 at the position of each water inlet cavity 101, and the water inlet and outlet diaphragm 23 can selectively block the water outlet 131 to control the water outlet of the water inlet and outlet cover 14. Make this miniature water pump during operation can absorb water with two intake antrums 101 in proper order, then outwards discharge through the delivery port 131 that corresponds separately again to this reaches this miniature water pump during operation flow control's purpose, has the work efficiency that improves this miniature water pump during operation and inhales drainage, and then has the stability that improves this miniature water pump during operation flow control. Of course, the number of the inlet cavities 101 in the micro-water pump of the present embodiment is not limited to two as shown in the figure, and one, three, or even more inlet cavities 101 may be provided for those skilled in the art, and will not be described herein.

It can be understood that the number of the umbrella valves 22 of this embodiment is two, and two umbrella valves 22 are arranged corresponding to two water inlet cavities 101, and the motor driving assembly can drive two water inlet cavities 101 on the main diaphragm 21 to deform in sequence during operation, so as to form vacuum negative pressure, and open the umbrella valves 22, thereby achieving the purpose of absorbing water during operation of the micro water pump. The umbrella valve 22 of the present embodiment is an umbrella-shaped diaphragm.

In the present embodiment, the water inlet and outlet diaphragm 23 of the present embodiment is embedded between the compression window 13 and the water inlet and outlet cover 14 to assemble and seal the compression window 13 and the water inlet and outlet cover 14; wherein the water inlet and outlet membrane 23 has a lobe 231 matching with the water outlet 131 on the compression window 13, and the lobe 231 is attached to the compression window 13 to block the water outlet 131 of the compression window 13.

As can be seen from the above, the micro water pump of the embodiment is provided with the water inlet/outlet diaphragm 23 in a reasonable structure, so that when the micro water pump does not discharge water, no interaction force exists between the ear flap 231 of the water inlet/outlet diaphragm 23 and the compression window 13, thereby preventing the water inlet/outlet diaphragm 23 and the compression window 13 from being adhered to each other, further ensuring normal water discharge when the micro water pump works, and having an effect of prolonging the service life of the micro water pump; meanwhile, the water inlet and outlet diaphragm 23 is assembled between the compression window 13 and the water inlet and outlet cover 14, so that the compression window 13 and the water inlet and outlet cover 14 can be directly assembled and sealed, the compression window 13 and the water inlet and outlet cover 14 are prevented from being sealed in other modes, and the micro water pump has the effect of reducing the production cost of the micro water pump.

Specifically, the position that lies in between compression window 13 and business turn over water cover 14 on business turn over water diaphragm 23 of this embodiment is equipped with sealed protruding muscle 232 of round, compression window 13 or business turn over water cover 14 can act on sealed protruding muscle 232 to the sealed protruding muscle 232 deformation of extrusion, make the miniature water pump of this embodiment can utilize the deformation of sealed protruding muscle 232 on business turn over water diaphragm 23, the realization is sealed with the assembly of business turn over water cover 14 to compression window 13, so that with business turn over water diaphragm 23 to business turn over water cover 14 and compression window 13 assembly seal, simplified structure has, the effect of the assembly of being convenient for.

Further alternatively, in the micro-water pump of the present embodiment, the compression window 13 or the water inlet/outlet cover 14 is provided with a sealing convex ring (not shown), and the sealing convex ring can act on the water inlet/outlet membrane 23 to squeeze the water inlet/outlet membrane 23 to deform, so that the micro-water pump of the present embodiment can also act on the water inlet/outlet membrane 23 by using the sealing convex ring provided on the compression window 13 or the water inlet/outlet cover 14, and achieve the assembly sealing between the compression window 13 and the water inlet/outlet cover 14 by the water inlet/outlet membrane 23 by squeezing the water inlet/outlet membrane 23 to deform.

It can be understood that the ear lobes 231 of the water inlet and outlet diaphragm 23 of the present embodiment are disposed in one-to-one correspondence with the water outlet 131 of the compression window 13 and the water inlet cavity 101, specifically, the number of the ear lobes 231 of the present embodiment is two, and one end surface of the two ear lobes 231 facing the compression window 13 and one end surface of the water inlet and outlet diaphragm 23 facing the compression window 13 are disposed on the same plane. The miniature water pump of the embodiment can utilize the ear flap 231 to be arranged at a reasonable position on the water inlet and outlet diaphragm 23, so that the water inlet and outlet diaphragm 23 assembled on the compression window 13 can realize the plugging of the ear flap 231 to the water outlet 131 on the compression window 13, and the ear flap 231 can be separated from the water outlet 131 on the compression window 13 once stressed, thereby facilitating the water outlet of the miniature water pump during working.

The water inlet/outlet membrane 23 of the present embodiment is provided with a square through groove 233, and the two ear flaps 231 are respectively disposed on two opposite side groove walls of the square through groove 233, so as to realize the assembly connection of the ear flaps 231 on the water inlet/outlet membrane 23, thereby simplifying the structure of the water inlet/outlet membrane 23. Of course, it should be noted that two ear flaps 231 are respectively disposed on two opposite side walls of the through slot 233 above the water inlet/outlet diaphragm 23 in two different arrangements, and the length of the ear flap 231 can be specifically set according to the usage requirement of the water outlet 131 on the cover compressing window 13, which will not be described herein.

Or, the water inlet and outlet membrane 23 of the present embodiment is provided with the square through groove 233, the connecting rib 234 is provided at the position of the square through groove 233, the two ear flaps 231 are respectively located at two sides of the connecting rib 234, and the ear flaps 231 are assembled and connected to the water inlet and outlet membrane 23, so that the structure of the water inlet and outlet membrane 23 is simplified.

As can be seen from the above, the compression window 13 of the present embodiment is provided with the water inlet 132 communicated with the water inlet chamber 101, and the umbrella valve 22 can selectively block the water inlet 132 to control the water inlet of the water inlet/outlet cover 14. Wherein each umbrella valve 22 corresponds to a plurality of water inlets 132. Make the miniature water pump during operation of this embodiment, can intake simultaneously through a plurality of water inlets 132 to this water inflow that improves this miniature water pump during operation, and a plurality of water inlets 132 collaborative work have the flow of adjusting this miniature water pump during operation, and then have the effect that improves this miniature water pump during operation flow control stability.

In the preferred embodiment of the present invention, the water inlet and outlet cover 14 of the present embodiment is provided with a flow restrictor 200 on the water inlet pipe 141 and/or the water outlet pipe 142. When the micro water pump of the embodiment works, the flow rate of the inlet water of the inlet pipe 141 and/or the outlet water of the outlet pipe 142 on the inlet and outlet water covers 14 can be adjusted by using the flow restrictor 200, so that the micro water pump can select the flow restrictors 200 with different apertures according to different use requirements, and further the micro water pump can be suitable for adjusting different flow rates. That is, the micro-water pump of the present embodiment can select different flow restrictors 200 to act on the water inlet pipe 141 and/or the water outlet pipe 142 of the water inlet and outlet cover 14 according to different usage requirements, which will not be described herein. It should be noted that the flow restrictor 200 of the present embodiment is a plug having a through hole, and the plug is embedded in the water inlet pipe 141 and/or the water outlet pipe 142 of the water inlet/outlet cover 14 in an interference fit manner, so that the flow restrictor 200 can be made of local materials, and has an effect of reducing cost.

In addition, it should be noted that the medium used in the operation of the micro water pump of the present invention is not limited to the water described above, and may be applied to other liquids or gases, and is not developed here.

The motor driving assembly of the present embodiment specifically includes a motor 31 fixedly connected to the base 11, a cam 32 disposed on a rotating shaft of the motor 31, a bracket 33 matched with the main diaphragm 21, and a core rod 34 for connecting the cam 32 and the bracket 33, so that when the motor driving assembly of the present embodiment works, the motor 31 drives the cam 32 to rotate, the bracket 33 is driven to rotate by the core rod 34, and then the bracket 33 is used to drive the main diaphragm 21 to move up and down, which will not be described herein.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification 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 invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A miniature water pump comprises a base, a main diaphragm fixing seat, a compression window, a water inlet and outlet cover, a main diaphragm, an umbrella valve, a water inlet and outlet diaphragm and a motor driving assembly, wherein the main diaphragm, the umbrella valve, the water inlet and outlet diaphragm and the motor driving assembly are sequentially connected and fixed, the main diaphragm is used for controlling the water inlet and outlet of the water inlet and outlet cover, the water inlet and outlet cover is provided with a water inlet pipe and a water outlet pipe, and the motor driving assembly can drive the main diaphragm to be selectively matched with the umbrella valve and the water inlet and outlet diaphragm so as to respectively control the water inlet of the water inlet pipe and the water outlet of the water outlet pipe;

the water inlet and outlet cover is characterized in that a one-way valve is arranged at the position where the water outlet pipe is located, so that water inlet of the water outlet pipe is limited.

2. The micro-water pump according to claim 1, wherein the check valve comprises an internal valve cover fixedly connected to the water outlet pipe, a check head matched with the internal valve cover, and a check head spring, the water outlet pipe is inwardly formed with a step, one end of the check head spring abuts against the step, the other end of the check head spring is sleeved on the check head, and the check head spring can push the check head to abut against the internal valve cover so as to block a water outlet channel of the internal valve cover.

3. The miniature water pump according to claim 2, wherein an end surface of the check head facing the built-in valve cover is provided with an arc-shaped convex surface, and the arc-shaped convex surface abuts against the passage opening of the built-in valve cover so as to block the water outlet passage on the built-in valve cover.

4. The micro-water pump as claimed in claim 2, wherein the outer peripheral wall of the check head is connected with a plurality of extending bosses, and each extending boss abuts against the inner wall of the water outlet pipe at an end far away from the check head.

5. The miniature pump of claim 2 wherein said internal valve cover is an interference fit on said outlet pipe.

6. The miniature water pump according to claim 5, wherein the outer peripheral wall of the internal valve cover is provided with two limiting lugs, the wall of the water outlet pipe is provided with two grooves matched with the limiting lugs, and the assembling position of the internal valve cover on the water outlet pipe can be determined by abutting fit between the limiting lugs and the groove bottoms of the grooves.

7. The micro-water pump according to claim 1, wherein the water inlet and outlet membrane is embedded between the compression window and the water inlet and outlet cover to assemble and seal the compression window and the water inlet and outlet cover; the water inlet and outlet membrane is provided with an ear lobe matched with the water outlet in the compression window, and the ear lobe is attached to the compression window to block the water outlet in the compression window.

8. The micro-water pump as claimed in claim 7, wherein a circle of sealing ribs are disposed on the water inlet/outlet membrane between the compression window and the water inlet/outlet cover, and the compression window or the water inlet/outlet cover can act on the sealing ribs to press the sealing ribs to deform.

9. The micro-water pump as claimed in claim 7, wherein the number of the ear lobes is two, and an end surface of one side of the two ear lobes facing the compression window is disposed on the same plane as an end surface of one side of the water inlet/outlet membrane facing the compression window.

10. The miniature water pump of claim 1 wherein said inlet and outlet covers are provided with flow restrictors on said inlet pipe and/or said outlet pipe.

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