Miniature water pump for stopping overflow by balancing pressure difference

Abstract

The invention discloses a miniature water pump for stopping overflow by balancing pressure difference, and relates to the technical field of liquid conveying equipment, the miniature water pump comprises a valve plate, a flow stopping seat, a flow stopping pad and a pipe shell; a liquid inlet cavity is formed in one side of the valve plate, the valve plate is provided with a plurality of liquid inlet holes and a plurality of liquid outlet holes, and one liquid inlet cavity is communicated with at least one liquid inlet hole and at least one liquid outlet hole; the flow stopping seat is further provided with a liquid passing opening, the flow stopping pad comprises a flow stopping valve, and the flow stopping valve can open and close the liquid passing opening. The side, deviating from the liquid passing opening, of the check valve and the pipe shell form a balance cavity, the balance cavity is separated from the liquid passing opening, the balance cavity is communicated with the liquid inlet pipe, the liquid inlet pipe, the liquid inlet hole and the liquid inlet cavity are in one-way communication, and the liquid inlet cavity, the liquid outlet hole, the liquid passing opening and the liquid outlet pipe are in one-way communication; the liquid inlet pipe comprises a bent liquid inlet nozzle, the liquid outlet pipe comprises a bent liquid outlet nozzle, and the liquid inlet nozzle and the liquid outlet nozzle are arranged in the same direction. According to the technical scheme, the overflow stopping stability and reliability of the micro water pump are improved.

Description

Technical Field

[0001] This invention relates to the field of liquid conveying equipment technology, and in particular to a miniature water pump that prevents overflow by balancing pressure differentials. Background Technology

[0002] In related technologies, micro water pumps often use a one-way valve structure to achieve the check function. However, when the micro water pump is powered off, a pressure difference may be generated between the outlet and inlet ends due to residual pressure. This pressure difference is prone to fluctuations from the inlet end to the outlet end and from the outlet end to the inlet end, forcing the one-way valve to open and causing liquid backflow, which may lead to the risk of overflow and leakage. Summary of the Invention

[0003] The main objective of this invention is to propose a micro water pump that uses balanced pressure differential to prevent overflow, thereby improving the overflow prevention stability and reliability of the micro water pump.

[0004] To achieve the above objectives, the micro water pump proposed in this invention for balancing pressure differentials and preventing overflow includes: Mounting base, wherein a leather cup component is provided inside the mounting base, and the leather cup component includes multiple leather cup parts; A valve plate is provided on the mounting base, and the opening of the cup portion abuts against the valve plate to form a liquid inlet chamber. The valve plate is provided with multiple liquid inlet holes and multiple liquid outlet holes, and one liquid inlet chamber is connected to at least one liquid inlet hole and at least one liquid outlet hole. A flow-stop seat is provided on the side of the valve plate away from the mounting base, and a liquid outlet channel is formed between the flow-stop seat and the valve plate. The flow-stop seat also has a liquid outlet, and the liquid outlet channel is connected to the liquid outlet hole and the liquid outlet. A flow-stop pad is disposed on the side of the flow-stop seat away from the valve plate. The flow-stop pad includes a flow-stop valve disposed opposite to the liquid inlet. The flow-stop valve can open and close the liquid inlet. The tube shell is covered on the side of the stop seat where the stop pad is located. The side of the stop valve away from the liquid outlet forms a balance chamber with the tube shell. The balance chamber is separated from the liquid outlet. The tube shell is provided with an inlet pipe and an outlet pipe. The balance chamber is connected to the inlet pipe. The inlet pipe, the inlet hole and the inlet chamber are unidirectionally connected. The inlet chamber, the outlet hole, the liquid outlet and the outlet pipe are unidirectionally connected. The inlet pipe and the outlet pipe are located on the side of the pipe shell away from the stop seat. The inlet pipe includes a bent inlet nozzle, and the outlet pipe includes a bent outlet nozzle. The inlet nozzle and the outlet nozzle are arranged in the same direction.

[0005] In one embodiment, the inlet pipe and the outlet pipe are located on the same diameter of the micro water pump, and the opening directions of the inlet nozzle and the outlet nozzle intersect the distribution direction of the inlet pipe and the outlet pipe.

[0006] In one embodiment, in the opening direction of the inlet and outlet nozzles, the height of the inlet nozzle located at the front is lower than the height of the outlet nozzle located at the rear.

[0007] In one embodiment, the tubular shell forms an independent inlet cavity and an outlet cavity on the outer periphery of the balance cavity. The inlet pipe and the outlet pipe are connected in the same direction to the inlet cavity and the outlet cavity, respectively. The inlet cavity is also connected to the inlet hole, and the outlet cavity is also connected to the liquid passage.

[0008] In one embodiment, the tube shell has a flow-stopping port that connects the inlet cavity and the balance cavity, and the flow-stopping port is located adjacent to the inlet tube.

[0009] In one embodiment, the inlet pipe and the stop valve are arranged adjacent to the same diameter of the micro water pump, and the stop valve is arranged adjacent to the stop pad in the axial direction of the micro water pump.

[0010] In one embodiment, an outlet cavity is formed on the outer periphery of the outlet channel, the outlet cavity is connected to the outlet port and the outlet cavity, and the check valve separates the outlet cavity and the balance cavity.

[0011] In one embodiment, the stop valve has a limiting boss protruding into the balance chamber, and an elastic element is sleeved on the limiting boss. One end of the elastic element abuts against the stop valve, and the other end abuts against the tube shell.

[0012] In one embodiment, the elastic element is configured as a compression spring, and the outer diameter of the elastic element gradually decreases in the direction from the housing to the limiting boss.

[0013] In one embodiment, the valve plate is provided with a first one-way valve plate and a second one-way valve plate. The first one-way valve plate opens and closes the inlet hole on one side of the inlet chamber, and the second one-way valve plate opens and closes the outlet hole on one side of the outlet.

[0014] In one embodiment, the micro water pump further includes a drive assembly and a swing member. The drive assembly is connected to the mounting base, and the swing member is disposed within the mounting base and is drive-connected to the drive assembly. The swing member includes a plurality of traction parts and a swing rod connected between the plurality of traction parts. One of the traction parts is connected to the bottom of a cup-shaped part. The swing rod is axially inclined relative to the output shaft of the drive assembly to swing eccentrically about the output shaft of the drive assembly.

[0015] The technical solution of this invention involves a cup-shaped component comprising multiple cup-shaped parts within a mounting base. A valve plate is mounted on the mounting base and fits against the open end of the cup-shaped part to form a liquid inlet chamber. This chamber has multiple liquid inlet holes and liquid outlet holes. Each liquid inlet chamber draws in liquid through at least one liquid inlet hole and discharges liquid through at least one corresponding liquid outlet hole. When the cup-shaped component is subjected to reciprocating deformation, the volume of the multiple liquid inlet chambers can be periodically changed, generating liquid suction and discharge actions. This achieves a fluid transport mode with multiple liquid inlet chambers operating in parallel, thereby improving flow stability and response speed. A flow-stopping seat is stacked on top of the valve plate, forming a liquid outlet channel between them. The liquid outlet channel connects the multiple liquid outlet holes to the liquid passage on the flow-stopping seat, allowing the liquid pumped from the liquid inlet chamber to flow sequentially through the liquid outlet hole, the liquid outlet channel, and the liquid passage, achieving convergence and guidance of liquid within the multiple liquid inlet chambers. A flow-stopping pad is positioned above the flow-stopping seat, and a flow-stopping valve correspondingly covers the liquid passage. The valve valve can open or close the liquid passage under pressure differential, achieving unidirectional liquid flow control. The tube shell is further encapsulated on the outside of the flow stop pad. Its inner wall and the side of the flow stop valve away from the liquid outlet together form an independent balance chamber. The balance chamber is connected to the liquid inlet pipe on the tube shell. The liquid inlet pipe, the liquid inlet hole, and the liquid inlet chamber form a one-way communication path, ensuring that the liquid from upstream can continuously enter the liquid inlet chamber and simultaneously flow into the balance chamber.

[0016] Therefore, when the water pump stops working due to power failure, residual pressure or a difference in liquid level in the outlet pipe can cause the liquid to attempt to flow in reverse, thus pushing the check valve open and causing backflow. This solution addresses this by connecting the inlet pipe to the balance chamber and the outlet channel. The balance chamber can automatically replenish liquid through the inlet pipe to maintain a pressure level similar to the outlet channel, effectively reducing the pressure difference across the check valve. This ensures the check valve remains balanced and closed, thereby improving the overflow prevention stability and reliability of the micro water pump. Furthermore, the inlet and outlet pipes are located on the same side, and both their inlet and outlet nozzles have a bent structure and extend in the same direction. This facilitates the installation of the micro water pump with external equipment or pipelines, avoiding cross-interference. Simultaneously, the bent inlet and outlet nozzles reduce the flow rate of liquid entering and exiting the micro water pump, thus ensuring the stability of the liquid delivered by the micro water pump. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of a micro water pump for balancing pressure difference to prevent overflow provided by the present invention; Figure 2 for Figure 1 First sectional view of a micro-sized water pump; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 for Figure 1 Second sectional view of a micro-sized water pump; Figure 5 for Figure 4 A magnified view of a section at point B in the middle; Figure 6 for Figure 1 Exploded view of a micro- or medium-sized water pump; Figure 7 for Figure 1 Schematic diagram of the middle valve plate; Figure 8 for Figure 1 Schematic diagram of the stop flow pad; Figure 9 for Figure 1 Schematic diagram of the stop valve seat; Figure 10 for Figure 1 A schematic diagram of the structure of the middle tube shell.

[0019] Explanation of icon numbers: 100. Drive assembly; 110. Eccentric wheel; 200. Mounting base; 310. Swing component; 311. Traction unit; 312. Swing rod; 320. Leather cup component; 321. Leather cup part; 301. Liquid inlet chamber; 400. Valve plate; 401. First one-way valve plate; 402. Second one-way valve plate; 410. Liquid inlet hole; 420. Liquid outlet hole; 500. Flow stop seat; 510. Liquid passage; 501. Liquid outlet channel; 502. Liquid outlet chamber; 600. Flow stop pad; 601. Balance chamber; 610. Flow stop valve; 620. Limiting boss; 700. Tube shell; 701. Inlet chamber; 702. Outlet chamber; 710. Liquid inlet pipe; 711. Liquid inlet nozzle; 720. Liquid outlet pipe; 721. Liquid outlet nozzle; 730. Flow stop port; 800. Elastic component.

[0020] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0024] This invention proposes a miniature water pump that uses pressure differential balancing to prevent overflow.

[0025] Please refer to Figures 1 to 3 , Figure 7 In one embodiment of the present invention, the micro water pump for balancing pressure differential to prevent overflow includes: Mounting base 200, the mounting base 200 is provided with a leather cup component 320, the leather cup component 320 includes a plurality of leather cup parts 321; Valve plate 400 is covered by mounting base 200. The opening of the cup portion 321 abuts against the valve plate 400 to form liquid inlet chamber 301. The valve plate 400 is provided with multiple liquid inlet holes 410 and multiple liquid outlet holes 420. One liquid inlet chamber 301 is connected to at least one liquid inlet hole 410 and at least one liquid outlet hole 420. A flow-stop seat 500 is provided on the side of the valve plate 400 away from the mounting base 200. A liquid outlet channel 501 is formed between the flow-stop seat 500 and the valve plate 400. The flow-stop seat 500 is also provided with a liquid outlet 510. The liquid outlet channel 501 is connected to the liquid outlet hole 420 and the liquid outlet 510. A flow stop pad 600 is disposed on the side of the flow stop seat 500 away from the valve plate 400. The flow stop pad 600 includes a flow stop valve 610 disposed opposite to the liquid outlet 510. The flow stop valve 610 can open and close the liquid outlet 510. The tube shell 700 covers the side of the stop seat 500 where the stop pad 600 is located. The side of the stop valve 610 away from the liquid outlet 510 forms a balance chamber 601 with the tube shell 700. The balance chamber 601 is separated from the liquid outlet 510. The tube shell 700 is provided with an inlet pipe 710 and an outlet pipe 720. The balance chamber 601 is connected to the inlet pipe 710. The inlet pipe 710, the inlet hole 410 and the inlet chamber 301 are unidirectionally connected. The inlet chamber 301, the outlet hole 420, the liquid outlet 510 and the outlet pipe 720 are unidirectionally connected. The inlet pipe 710 and the outlet pipe 720 are located on the side of the pipe shell 700 away from the stop seat 500. The inlet pipe 710 includes a bent inlet nozzle 711, and the outlet pipe 720 includes a bent outlet nozzle 721. The inlet nozzle 711 and the outlet nozzle 721 are arranged in the same direction.

[0026] The technical solution of the present invention provides a cup member 320 containing multiple cup portions 321 within the mounting base 200. A valve plate 400 is mounted on the mounting base 200 and fits against the open end of the cup portion 321 to form a liquid inlet chamber 301. The valve plate 400 is provided with multiple liquid inlet holes 410 and liquid outlet holes 420. Each liquid inlet chamber 301 draws in liquid through at least one liquid inlet hole 410 and discharges liquid through at least one corresponding liquid outlet hole 420. When the cup member 320 is subjected to reciprocating deformation, the volume of multiple liquid inlet chambers 301 can be periodically changed to generate liquid suction and discharge actions, realizing a fluid transport mode in which multiple liquid inlet chambers 301 work in parallel, thereby improving flow stability and response speed. A flow-stop seat 500 is stacked on top of a valve plate 400, forming a liquid outlet channel 501 between them. The liquid outlet channel 501 connects multiple liquid outlet holes 420 with liquid passage ports 510 on the flow-stop seat 500, allowing liquid pumped from the inlet chamber 301 to flow sequentially through the liquid outlet holes 420, the liquid outlet channel 501, and the liquid passage port 510, thus achieving the convergence and guidance of liquids in multiple inlet chambers 301. A flow-stop pad 600 is located above the flow-stop seat 500, and the flow-stop valve 610 correspondingly covers the liquid passage port 510. The liquid passage port 510 can be opened or closed under pressure difference drive to achieve unidirectional liquid flow control. The casing 700 is further encapsulated on the outside of the stop valve 600. Its inner wall and the side of the stop valve 610 away from the liquid outlet 510 together form an independent balance chamber 601. The balance chamber 601 is connected to the liquid inlet pipe 710 on the casing 700. The liquid inlet pipe 710, the liquid inlet hole 410 and the liquid inlet chamber 301 form a one-way communication path, ensuring that the liquid from the upstream can continuously enter the liquid inlet chamber 301 and simultaneously flow into the balance chamber 601.

[0027] Therefore, when the water pump stops working due to power failure, residual pressure or a difference in liquid level in the outlet pipe 720 may cause the liquid to attempt to flow in reverse, thereby pushing the check valve 610 to open and causing backflow. This solution addresses this by connecting the inlet pipe 710 to the balance chamber 601 and the outlet channel 501. The balance chamber 601 can automatically replenish liquid through the inlet pipe 710 to maintain a pressure level similar to that of the outlet channel 501, effectively reducing the pressure difference across the check valve 610. This ensures that the check valve 610 remains balanced and closed, thus improving the overflow prevention stability and reliability of the micro water pump. Furthermore, the inlet pipe 710 and outlet pipe 720 are located on the same side, and both their inlet nozzles 711 and 721 have a bent structure and extend in the same direction. This facilitates the installation of the micro water pump with external equipment or pipelines, avoiding cross-interference. Simultaneously, the bent inlet nozzles 711 and 721 also reduce the flow rate of liquid entering and exiting the micro water pump, thereby ensuring the stability of the liquid delivered by the micro water pump.

[0028] It should be noted that, as Figure 4 and Figure 9 As shown, the flow-stop seat 500 has a recessed mounting groove on the side facing the pipe shell 700. The flow-stop pad 600 is adapted to be installed in the mounting groove and has a certain elastic deformation capability. After the pipe shell 700 is installed, the opposite sides of the flow-stop pad 600 are tightly attached to the pipe shell 700 and the flow-stop seat 500, respectively. As for the mounting seat 200, it can be composed of a single component or two components stacked together.

[0029] In one embodiment, please refer to Figure 1 , Figure 2 and Figure 10 The inlet pipe 710 and outlet pipe 720 are located on the same diameter of the micro water pump, and the opening directions of the inlet nozzle 711 and outlet nozzle 721 intersect the distribution direction of the inlet pipe 710 and outlet pipe 720. It can be understood that the inlet nozzle 711 and outlet nozzle 721 avoid obstruction by the inlet pipe 710 or outlet pipe 720, and are led out on the same side at a certain angle, reducing resistance to external connections. Simultaneously, since the opening directions of the inlet nozzle 711 and outlet nozzle 721 are set in the same direction, the flow field consistency between the liquid inflow and outflow directions is good, reducing eddy current losses during confluence and diversion processes and ensuring delivery efficiency. Of course, in other embodiments, the inlet pipe 710 and outlet pipe 720 may be located at different diameter positions on the micro water pump.

[0030] Regarding the placement of the inlet nozzle 711 and the outlet nozzle 721, in one embodiment, please refer to... Figure 1 , Figure 2 and Figure 10In the opening direction of the inlet nozzle 711 and the outlet nozzle 721, the height of the inlet nozzle 711 and the outlet nozzle 721 located at the front is lower than the height of the outlet nozzle 721 located at the rear. It should be noted that the height is referenced to the side of the housing 700 where the inlet pipe 710 and the outlet pipe 720 are located; the greater the distance from this side, the greater the height. Based on the opening direction of the inlet nozzle 711 or the outlet nozzle 721, or the distribution direction of the inlet pipe 710 and the outlet pipe 720, the nozzles with smaller heights are located at the front, and the nozzles with larger heights are located at the rear, forming a stepped height difference layout with a lower front and a higher rear. This reduces interference between the inlet nozzle 711 and the outlet nozzle 721 and external connections, ensuring ease of operation for external connections. In this embodiment, the outlet nozzle 721 has a lower height, and the inlet nozzle 711 has a higher height. Of course, in other embodiments, the inlet nozzle 711 and the outlet nozzle 721 may be at the same height and intersect with the distribution direction of the inlet pipe 710 and the outlet pipe 720.

[0031] In one embodiment, please refer to Figure 2 , Figure 3 and Figure 10The shell 700 forms an independent inlet cavity 701 and outlet cavity 702 on the outer periphery of the balance cavity 601. The inlet pipe 710 and the outlet pipe 720 are connected in the same direction to the inlet cavity 701 and the outlet cavity 702 respectively. The inlet cavity 701 is also connected to the inlet hole 410, and the outlet cavity 702 is also connected to the liquid outlet 510. It is understood that the inlet chamber 701 and the outlet chamber 702 are independently connected to the inlet hole 410 on the valve plate 400 and the through port 510 on the stop seat 500 in the same cross section of the shell, forming two separate, unidirectional internal flow channels: one is the inlet path, where liquid enters the inlet chamber 701 from the inlet pipe 710 and flows into the inlet chamber 301 through the inlet hole 410; the other is the outlet path, where liquid enters the outlet chamber 702 from the inlet chamber 301 through the outlet hole 420, the outlet channel 501, and the through port 510, and is then discharged from the outlet pipe 720. By arranging the inlet and outlet flow channels in a spatially separated manner inside the shell 700, problems such as fluid crosstalk, pressure backflow, or internal leakage caused by adjacent or intersecting arrangement of the inlet and outlet chambers 502 are avoided. Especially during multi-chamber parallel operation or transient start-stop processes, the directionality and stability of fluid delivery can be improved. Meanwhile, since the inlet chamber 701 is directly connected to the inlet pipe 710 and the inlet hole 410, and serves as the pressure source for the balance chamber 601, the liquid inside can be replenished to the balance chamber 601 in real time. This ensures that the pressure in the balance chamber 601 remains dynamically consistent with the inlet side when the pump is powered off, strengthening the pressure difference balancing capability on both sides of the check valve 610 and suppressing backflow caused by outlet back pressure. Furthermore, the inlet chamber 701 and outlet chamber 702 are distributed around the outer periphery of the balance chamber 601. On the one hand, they buffer the accumulated liquid, ensuring the uniformity of flow rate in the inlet pipe 710 and the outlet pipe 720, thereby ensuring the efficiency of the micro pump. On the other hand, they also improve the compactness of the channels within the micro pump, reducing its size. Of course, in other embodiments, the inlet pipe 710 can be directly connected to the inlet hole 410, and the outlet 510 can be directly connected to the outlet pipe 720.

[0032] In one embodiment, please refer to Figure 2 , Figure 3 and Figure 10The casing 700 has a stop valve 730 for connecting the inlet chamber 701 and the balance chamber 601. The stop valve 730 is located adjacent to the inlet pipe 710. It can be understood that the stop valve 730 can be located circumferentially adjacent to the inlet pipe 710, axially adjacent to the inlet pipe 710, or both circumferentially and axially adjacent to the inlet pipe 710. In this way, liquid from the inlet pipe 710 can quickly flow into the balance chamber 601 through the stop valve 730 after entering the inlet chamber 701. This ensures that even under conditions of low flow or transient shutdown, the balance chamber 601 can still preferentially obtain liquid replenishment from the inlet path, achieving a rapid response to the pressure within the balance chamber 601. This allows the pressure in the balance chamber 601 to track and approach the pressure in the inlet chamber 301 in real time, effectively offsetting the pressure difference acting on both sides of the stop valve 610, maintaining its stable closed state, and preventing reverse opening. Of course, in other embodiments, the stop port 730 may also be located in the inlet cavity 701 away from the liquid inlet pipe 710.

[0033] In one embodiment, please refer to Figure 3 , Figure 5 and Figure 10 The inlet pipe 710 and the stop valve 730 are positioned near the same diameter as the micro water pump, with the stop valve 730 located axially near the stop pad 600. It can be understood that liquid entering through the inlet pipe 710 can quickly flow into the balance chamber 601 via the stop valve 730 through the inlet chamber 701 in the shortest circumferential direction, reducing the circumferential flow path and suppressing the probability of eddies within the balance chamber 601. The balance chamber 601 is adjacent to the back of the stop valve 610, ensuring that the pressure-acting surface of the balance chamber 601 is in close contact with the back of the stop valve 610. Pressure changes directly affect the opening and closing performance of the stop valve 610. When the micro water pump stops, the liquid can directly impact the stop pad 600, further increasing the pressure of the stop valve 610 on the liquid outlet 510, thereby ensuring the sealing stability of the stop valve 610 on the liquid outlet 510. Of course, in other embodiments, the flow stop 730 and the channel in the liquid inlet pipe 710 may be radially offset along the micro pump.

[0034] In one embodiment, please refer to Figure 3 , Figure 5 and Figure 9An outlet chamber 502 is formed on the outer periphery of the outlet channel 501. The outlet chamber 502 is connected to the through port 510 and the outlet chamber 702. The check valve 610 separates the outlet chamber 502 and the balance chamber 601. It can be understood that the outlet chamber 502 is connected to the through port 510 on the check seat 500 and the outlet chamber 702 inside the casing 700, allowing the liquid flowing from the outlet hole 420 through the outlet channel 501 to uniformly flow into the outlet chamber 502 and smoothly enter the outlet chamber 702, finally being discharged through the outlet pipe 720. This annular or circumferentially distributed outlet chamber 502 effectively expands the fluid transition space, reduces turbulence and throttling effects during liquid turning and converging, and improves the smoothness of the outlet flow and the stability of the flow rate. The outlet chamber 502 is an elliptical ring with its major axis extending along the axial direction of the micro pump. The main forces on the opposite sides of the check valve 610 are the balance chamber 601 and the outlet channel 501. When the water pump is working normally, positive pressure gradually builds up in the outlet channel 501, pushing the check valve 610 to open against the pressure of the balance chamber 601, allowing the liquid to be discharged smoothly. When the water pump is powered off or stopped, if there is reverse pressure at the outlet end, this pressure is transmitted through the outlet chamber 702 and the outlet chamber 502 to the side of the check valve 610 facing the liquid outlet 510. At this time, since the balance chamber 601 is connected to the inlet chamber 701 of the adjacent inlet pipe 710 through the check port 730, its pressure is consistent with that of the inlet channel side, thus forming a similar pressure environment on both sides of the check valve 610, so that the check valve 610 remains closed due to the force balance, blocking the backflow of liquid.

[0035] In one embodiment, please refer to Figure 3 , Figure 5 and Figure 8The check valve 610 has a limiting boss 620 protruding into the balance chamber 601. An elastic element 800 is fitted onto the limiting boss 620. One end of the elastic element 800 abuts against the check valve 610, and the other end abuts against the casing 700. It can be understood that one end of the elastic element 800 abuts against the root of the boss or the side step of the check valve 610, and the other end abuts against the inner wall of the casing 700, forming an axial elastic pre-compression structure for the check valve 610. This allows the check valve 610 to maintain a certain initial closing force even under conditions of no or low pressure differential, effectively preventing accidental opening caused by vibration, tilted installation, or small reverse pressure differentials, and improving the sealing reliability of the micro pump in the shutdown state. Meanwhile, during the initial startup of the water pump, as the pressure in the outlet chamber 502 gradually increases, the liquid needs to overcome the preload of the elastic element 800 to open the check valve 610. This helps to prevent damage to the check valve 610 caused by the "water hammer" impact at the moment of pump startup and makes the opening process more stable and controllable. After power failure and shutdown, when residual pressure at the outlet attempts to push the liquid back, the elastic element 800 and the pressure in the balance chamber 601 work together to resist the reverse pressure from the outlet chamber 502. The elastic element 800 provides a stable mechanical reset force, while the balance chamber 601 continuously introduces pressure from the inlet side through the check port 730 to offset the pressure loss acting on the back side of the check valve 610, enhancing the check valve 610's resistance to back pressure and its self-locking stability. Of course, the balance chamber 601 also reduces the elastic force of the elastic element 800, preventing the check valve 610 from sticking to the outlet 510 after prolonged shutdown. In addition, the limiting boss 620 also plays an axial positioning and guiding role for the elastic element 800, preventing it from deviating or coming out during compression, and ensuring uniform force and reliable operation.

[0036] Furthermore, in this embodiment, please refer to Figure 3 , Figure 5 and Figure 6The elastic element 800 is configured as a compression spring, and its outer diameter gradually decreases from the housing 700 to the limiting boss 620. The elastic element 800 is configured as a tapered compression spring with an outer diameter that gradually decreases from the housing 700 to the limiting boss 620. This configuration makes the stress distribution between the coils more uniform during compression, avoiding the uneven loading, skewing, or buckling instability caused by localized concentrated force in traditional constant-diameter helical springs. Under the dynamic operating conditions of frequent opening and closing of the check valve 610, the tapered design enhances the axial stability and guiding performance of the compression spring, ensuring that the elastic element 800 always compresses and rebounds smoothly along the centerline. Meanwhile, since the large-diameter end of the compression spring abuts against the inner wall of the tube shell 700 and the small-diameter end is sleeved on the limiting boss 620, the compression spring provides a stable reset preload force while its gradual stiffness characteristics result in less resistance during the initial compression stage. This facilitates the smooth opening of the check valve 610 under lower outlet pressure. As the opening degree increases, the stiffness of the spring coil involved in deformation gradually increases, forming a "soft start, hard seal" response mode, which ensures both valve opening sensitivity and enhanced sealing reliability during closure. Of course, in other embodiments, the elastic element 800 can also be configured as a compression spring with a full-length diameter.

[0037] In one embodiment, please refer to Figure 3 , Figure 5 and Figure 6The valve plate 400 is provided with a first one-way valve plate 401 and a second one-way valve plate 402. The first one-way valve plate 401 opens and closes the inlet hole 410 on one side of the inlet chamber 301, and the second one-way valve plate 402 opens and closes the outlet hole 420 on one side of the outlet 510. The first one-way valve plate 401 is located on one side of the inlet chamber 301 and is used to open and close the corresponding inlet hole 410. The second one-way valve plate 402 is located on one side of the outlet 510 and is used to control the opening and closing of the outlet hole 420. When the cup portion 321 is driven to compress towards the valve plate 400, the pressure inside the inlet chamber 301 increases, causing the first one-way valve plate 401 to tightly seal against the inlet hole 410, preventing liquid backflow into the inlet pipe 710. Simultaneously, the increased pressure within the chamber pushes the second one-way valve plate 402 open, allowing liquid to enter the outlet channel 501 through the outlet hole 420 and flow into subsequent channels. When the cup portion 321 rebounds and expands, a negative pressure is formed inside the inlet chamber 301, causing the first one-way valve plate 401 to be pushed open by external hydraulic pressure, allowing liquid to flow from the inlet pipe 710 into the inlet chamber 301 through the inlet hole 410. At the same time, the pressure on the outlet side is higher than that in the inlet chamber 301, pushing the second one-way valve plate 402 to close the outlet hole 420, preventing backflow. This improves the volumetric efficiency and output stability of the micro pump. In multi-chamber parallel operation, the filling and draining processes of each chamber do not interfere with each other, avoiding flow pulsation and airlock phenomena. In addition, combined with the overflow prevention structure formed by the stop valve 610 on the stop pad 600 and the balance chamber 601, the first one-way valve plate 401 and the second one-way valve plate 402 undertake the periodic one-way conduction control in the operating state, which further improves the backflow prevention capability of the micro water pump.

[0038] In one embodiment, please refer to Figure 2 , Figure 4 and Figure 6The miniature water pump also includes a drive assembly 100 and a swing member 310. The drive assembly 100 is connected to a mounting base 200. The swing member 310 is disposed within the mounting base 200 and is drive-connected to the drive assembly 100. The swing member 310 includes multiple traction parts 311 and a swing rod 312 connected between the multiple traction parts 311. One traction part 311 is connected to the bottom of a cup part 321. The swing rod 312 is inclined relative to the axial direction of the output shaft of the drive assembly 100 so as to swing eccentrically about the output shaft of the drive assembly 100. It should be noted that the drive assembly 100 includes a drive motor, a gearbox, and an eccentric wheel 110. Alternatively, the drive assembly 100 can be configured as a drive motor and an eccentric wheel 110 on its output shaft. The mounting base 200 is closed on one side of the drive assembly 100 and open on the side facing the valve plate 400. Each traction unit 311 is connected to the bottom of its corresponding cup portion 321, and the swing arm 312 is inclined relative to the axial direction of the output shaft of the drive assembly 100, causing the swing member 310 to oscillate eccentrically around the output shaft under the drive of the drive assembly 100. When the drive assembly 100 outputs rotation or reciprocating motion, the inclined structure of the swing arm 312 converts the driving force into a periodically changing traction action along the axial direction, driving each traction unit 311 to move up and down synchronously, thereby driving multiple cup portions 321 to undergo compression and rebound deformation in sequence, realizing the alternating change of the volume of the liquid inlet chamber 301, and completing the cycle of liquid suction and discharge. In this way, by using a single swing member 310 to drive multiple cup portions 321 simultaneously, the coordination and synchronization of the working phase of each liquid inlet chamber 301 are ensured, effectively reducing flow pulsation and improving output stability; at the same time, the inclined swing arm 312 generates adaptive radial displacement compensation during the oscillation process, reducing the risk of motion interference and local wear, and extending service life. The lower part of the cup portion 321 is provided with a connecting rod, and the traction part 311 of the swing member 310 is sleeved on the connecting rod to traction the cup portion 321 to deform.

[0039] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformations made based on the technical concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. A miniature water pump that prevents overflow by balancing pressure difference, characterized in that, include: Mounting base, wherein a leather cup component is provided inside the mounting base, and the leather cup component includes multiple leather cup parts; A valve plate is provided on the mounting base, and the opening of the cup portion abuts against the valve plate to form a liquid inlet chamber. The valve plate is provided with multiple liquid inlet holes and multiple liquid outlet holes, and one liquid inlet chamber is connected to at least one liquid inlet hole and at least one liquid outlet hole. A flow-stop seat is provided on the side of the valve plate away from the mounting base, and a liquid outlet channel is formed between the flow-stop seat and the valve plate. The flow-stop seat also has a liquid outlet, and the liquid outlet channel is connected to the liquid outlet hole and the liquid outlet. A flow-stop pad is disposed on the side of the flow-stop seat away from the valve plate. The flow-stop pad includes a flow-stop valve disposed opposite to the liquid inlet. The flow-stop valve can open and close the liquid inlet. The tube shell is covered on the side of the stop seat where the stop pad is located. The side of the stop valve away from the liquid outlet forms a balance chamber with the tube shell. The balance chamber is separated from the liquid outlet. The tube shell is provided with an inlet pipe and an outlet pipe. The balance chamber is connected to the inlet pipe. The inlet pipe, the inlet hole and the inlet chamber are unidirectionally connected. The inlet chamber, the outlet hole, the liquid outlet and the outlet pipe are unidirectionally connected. The inlet pipe and the outlet pipe are located on the side of the pipe shell away from the stop seat. The inlet pipe includes a bent inlet nozzle, and the outlet pipe includes a bent outlet nozzle. The inlet nozzle and the outlet nozzle are arranged in the same direction.

2. The micro water pump for preventing overflow by balancing pressure difference as described in claim 1, characterized in that, The inlet pipe and the outlet pipe are located on the same diameter of the micro water pump, and the opening directions of the inlet nozzle and the outlet nozzle intersect the distribution direction of the inlet pipe and the outlet pipe.

3. The micro water pump for preventing overflow by balancing pressure difference as described in claim 1, characterized in that, In the opening direction of the inlet and outlet nozzles, the height of the inlet nozzle located at the front is lower than the height of the outlet nozzle located at the rear.

4. The micro water pump for preventing overflow by balancing pressure difference as described in claim 1, characterized in that, The tubular shell forms an independent inlet cavity and an outlet cavity on the outer periphery of the balance cavity. The inlet pipe and the outlet pipe are connected in the same direction to the inlet cavity and the outlet cavity, respectively. The inlet cavity is also connected to the inlet hole, and the outlet cavity is also connected to the liquid passage port.

5. The micro water pump for preventing overflow by balancing pressure difference as described in claim 4, characterized in that, The tube shell has a flow-stop port that connects the inlet cavity and the balance cavity, and the flow-stop port is located adjacent to the liquid inlet tube.

6. The micro water pump for preventing overflow by balancing pressure difference as described in claim 5, characterized in that, The inlet pipe and the stop valve are arranged with the same diameter adjacent to the micro water pump, and the stop valve is arranged axially adjacent to the stop pad of the micro water pump.

7. The micro water pump for preventing overflow by balancing pressure difference as described in claim 4, characterized in that, The outer periphery of the liquid outlet channel is formed with a liquid outlet cavity, which is connected to the liquid outlet and the discharge cavity. The flow stop valve separates the liquid outlet cavity and the balance cavity.

8. The micro water pump for preventing overflow by balancing pressure difference as described in claim 1, characterized in that, The stop valve has a limiting boss protruding into the balance chamber, and an elastic element is sleeved on the limiting boss. One end of the elastic element abuts against the stop valve, and the other end abuts against the tube shell.

9. The micro water pump for preventing overflow by balancing pressure difference as described in claim 8, characterized in that, The elastic element is configured as a compression spring, and the outer diameter of the elastic element gradually decreases from the tube shell to the limiting boss.

10. The micro water pump for preventing overflow by balancing pressure difference as described in any one of claims 1 to 9, characterized in that, The valve plate is provided with a first one-way valve plate and a second one-way valve plate. The first one-way valve plate opens and closes the inlet hole on one side of the inlet chamber, and the second one-way valve plate opens and closes the outlet hole on one side of the outlet. And / or, the micro water pump further includes a drive assembly and a swing member, the drive assembly being connected to the mounting base, the swing member being disposed within the mounting base and being drive-connected to the drive assembly, the swing member including a plurality of traction parts and a swing rod connected between the plurality of traction parts, one of the traction parts being connected to the bottom of a cup portion, the swing rod being inclined relative to the axial direction of the output shaft of the drive assembly to swing eccentrically about the output shaft of the drive assembly.

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