High-flow-precision diaphragm pump cover structure and miniature diaphragm water pump

Abstract

The utility model relates to a high-flow-precision diaphragm pump cover structure and a miniature diaphragm water pump and relates to the technical field of fluid conveying devices.The pump cover structure comprises a cover body, a water outlet pipe, a water inlet pipe and a backflow piece, the water outlet pipe and the water inlet pipe are both fixedly connected with the cover body, and the backflow piece comprises a backflow part and a pressure control opening and closing part; a pressure stabilizing plate is arranged in the water outlet pipe, and a pressure stabilizing cavity is formed in the side, away from a water outlet of the water outlet pipe, of the pressure stabilizing plate. Under the condition that an external pipeline connected with the water outlet pipe is not blocked, after water flow enters the water outlet pipe, relatively stable internal pressure is formed in the pressure stabilizing cavity due to the existence of the pressure stabilizing plate, and the size of the internal pressure is determined by the size of the cross sectional area in the water outlet pipe blocked by the pressure stabilizing plate and is not influenced by the external pipeline. The same water outlet cross sectional area is matched with the same flow speed to determine the consistency of the water outlet amount, and therefore the pump cover structure can effectively improve the accuracy of controlling the fluid conveying amount.

Description

Technical Field

[0001] This application relates to the technical field of fluid transport devices, and in particular to a high-flow-precision diaphragm pump cover structure and a miniature diaphragm water pump. Background Technology

[0002] A miniature diaphragm pump is a small fluid transport device designed based on the reciprocating motion principle of a diaphragm. Its core structure is a "motor + pump body," featuring compact size and strong self-priming capability. Due to its compact structure, high efficiency, and stable performance, miniature diaphragm pumps are widely used in medical, home appliance, and industrial fields. Specifically, the rotation of the motor drives an eccentric wheel or transmission shaft, which in turn drives the internal diaphragm to reciprocate, changing the pump chamber volume and creating a pressure difference, thereby achieving the intake and discharge of liquids or gases.

[0003] In the operation of miniature diaphragm water pumps, it is often necessary to control parameters such as time to achieve quantitative delivery of fluids such as water. However, the pipeline connected to the outlet of the miniature diaphragm water pump is affected by various factors, resulting in fluctuating pressure within the pipeline. This, in turn, affects the water flow efficiency at the outlet of the miniature diaphragm water pump, leading to inaccurate control of the fluid delivery rate. Utility Model Content

[0004] To improve the accuracy of flow control, the purpose of this application is to provide a high-flow-precision diaphragm pump cover structure and a miniature diaphragm water pump.

[0005] This application provides a high-flow-precision diaphragm pump cover structure and a miniature diaphragm water pump, which adopts the following technical solution:

[0006] A high-flow-precision diaphragm pump cover structure includes a cover body, an outlet pipe, an inlet pipe, and a return component. The outlet pipe and the inlet pipe are both fixedly connected to the cover body. The return component includes a return section and a pressure-controlled opening and closing section for controlling the opening and closing of the return section. The return section has a pressure relief outlet connected to the inlet pipe and a pressure relief inlet connected to the outlet pipe. The outlet pipe has an outlet, and a pressure stabilizing plate is installed inside the outlet pipe. A pressure stabilizing chamber is formed on the side of the pressure stabilizing plate away from the outlet of the outlet pipe.

[0007] By adopting the above technical solution, assuming the external pipeline connected to the outlet pipe is not blocked, when water flows into the outlet pipe, the presence of the pressure stabilizing plate creates a relatively stable internal pressure within the pressure stabilizing chamber. The magnitude of this internal pressure is determined by the cross-sectional area of ​​the outlet pipe after it is blocked by the pressure stabilizing plate, and is not affected by the external pipeline. At this time, the same outlet cross-sectional area combined with the same flow velocity ensures good consistency in the water output, thereby enabling the pump cover structure of this application to effectively improve the accuracy of controlling the fluid delivery volume.

[0008] Optionally, the pressure control opening and closing part includes a plug for opening and closing the pressure relief inlet and an elastic element for driving the plug to press against the pressure relief inlet. The plug has a working surface for sealing the pressure relief inlet, and the working surface gradually protrudes from the edge to the center.

[0009] By adopting the above technical solution, when the pressure in the pressure stabilizing chamber exceeds the preset target pressure, the water pressure drives the plug to overcome the pressure of the elastic element, thereby opening the pressure relief inlet. At this time, the inlet and outlet pipes form a return channel through the return section, and the water in the pressure stabilizing chamber flows back into the inlet pipe through the return channel, so that the internal pressure in the pressure stabilizing chamber can still remain stable. The working surface of the plug gradually bulges from the edge to the center, which can effectively increase the water outlet space, so that the rebound of the elastic element does not need to be too high, reducing the space required for the elastic element to move, and optimizing the structural space occupied by the return section.

[0010] Optionally, the working surface can be a circular arc surface.

[0011] By adopting the above technical solution, the arc surface setting makes the contact between the working surface and the pressure relief inlet more uniform. Especially when the plug just starts to move away from the pressure relief inlet, the opening area between the pressure relief inlet and the working surface of the plug increases proportionally. At this time, the water pressure returning through the pressure relief inlet will be more stable, thereby making the pressure stabilization effect of the pressure control opening and closing part more stable during the initial working period, thus further improving the accuracy of flow control.

[0012] Optionally, the opening end face of the pressure relief inlet is provided with a positioning platform for engaging with the working surface of the plug.

[0013] By adopting the above technical solution, a positioning platform is configured on the opening end face of the pressure relief inlet for connecting the return channel, which increases the deformation pressure at the end of the plug that seals the pressure relief inlet, thereby improving the sealing performance of the plug.

[0014] Optionally, the reflux section includes a fixing member and a mounting member installed on the fixing member. The fixing member is fixedly connected to the water inlet pipe and also fixedly connected to the water outlet pipe, and a reflux cavity is formed between the fixing member and the mounting member.

[0015] By adopting the above technical solution, when the pressure in the pressure stabilizing chamber exceeds the preset target pressure, the water pressure drives the plug to overcome the pressure of the elastic element. The return chamber is the return channel. The return chamber is connected to the inlet pipe and the outlet pipe. Excess water in the outlet pipe enters the return chamber through the pressure relief inlet hole, and then leaves the return chamber through the pressure relief outlet hole and enters the inlet pipe. This ensures that the pressure in the pressure stabilizing chamber is consistent, thereby making the fluid flow rate consistent.

[0016] Optionally, the mounting or fastening component is equipped with a snap-fit ​​mechanism, and the fastening and mounting components are connected by snap-fit.

[0017] By adopting the above technical solution and using the snap-fit ​​mechanism on the return section for connection, the structure is more compact than the traditional screw connection, and it can effectively reduce material and labor costs.

[0018] Optionally, when the clip is in the mounting part, the clip has a latch, and the fastener has a buckle for inserting the clip. The number of clips is at least two, and the at least two clips are located on opposite sides of the mounting part.

[0019] By adopting the above technical solution, during installation, the buckle is embedded into the corresponding buckle slot, and then the connection stability between the installation part and the fastener is further improved with the cooperation of multiple sets of buckle heads.

[0020] Optionally, the reflux chamber has a guide section for the plug to slide, and the inner wall of the guide section is provided with multiple guide platforms, with a guide groove formed between two adjacent guide platforms.

[0021] By adopting the above technical solution, the accuracy of the pressure relief inlet and the plug can be improved. During the movement of the plug, the friction generated by the sliding between the plug and the guide slide is smaller, and the presence of the guide groove will not affect the flow of fluid. Thus, the occurrence of impurities blocking the plug due to the small gap can be minimized.

[0022] Optionally, a sealing ring is provided between the mounting component and the fixing component, and the sealing ring is arranged around the outer ring of the return cavity.

[0023] By adopting the above technical solution, the sealing ring is pressed tightly when the mounting parts and the fixing parts are fastened to seal the outer ring of the reflux cavity, thereby avoiding leakage in the reflux cavity and improving the stability of the pressure stabilization effect when the reflux cavity is working.

[0024] A miniature diaphragm water pump, comprising the high flow accuracy diaphragm pump cover structure of any one of the above.

[0025] By adopting the above technical solution, provided the external pipeline connected to the outlet pipe is not blocked, after the pump delivers water into the outlet pipe, the pressure-stabilizing capability of the pump cover allows a relatively stable internal pressure to form inside the pump. The magnitude of the internal pressure is determined by the cross-sectional area of ​​the outlet pipe after it is blocked by the pressure-stabilizing plate, and is not affected by the external pipeline. The same outlet cross-sectional area combined with the same flow velocity ensures the consistency of the water output, thereby enabling the miniature diaphragm water pump of this application to effectively improve the accuracy of controlling the fluid delivery volume.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. When the external pipeline connected to the outlet pipe is not blocked, the presence of the pressure stabilizing plate creates a relatively stable internal pressure within the pressure stabilizing chamber after water enters the outlet pipe. The magnitude of this internal pressure is determined by the cross-sectional area of ​​the outlet pipe after it is blocked by the pressure stabilizing plate, and is not affected by the external pipeline. The same outlet cross-sectional area combined with the same flow velocity ensures the consistency of the water output, thereby enabling the pump cover structure of this application to effectively improve the accuracy of controlling the fluid delivery volume.

[0028] 2. When the pressure inside the pressure stabilizing chamber exceeds the preset target pressure, the water pressure drives the plug to overcome the pressure of the elastic element, thereby opening the pressure relief inlet. At this time, the inlet and outlet pipes form a return channel through the return section, and the water in the pressure stabilizing chamber flows back into the inlet pipe through the return channel, so that the internal pressure in the pressure stabilizing chamber can still remain stable. The working surface of the plug gradually bulges from the edge to the center, which can effectively increase the water outlet space, so that the rebound of the elastic element does not need to be too high, reducing the space required for the elastic element to move, and optimizing the structural space occupied by the return section;

[0029] 3. The reflux chamber is equipped with multiple guide slides, which can improve the accuracy of the fit between the pressure relief inlet and the plug. During the movement of the plug, the friction generated by the sliding between the plug and the guide slide is reduced, and the presence of the guide groove does not affect the flow of fluid. This can minimize the occurrence of impurities blocking the plug due to insufficient clearance. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0031] Figure 2 This is a partial structural cross-sectional schematic diagram of an embodiment of this application;

[0032] Figure 3 This is a cross-sectional structural schematic diagram of the reflow component according to an embodiment of this application;

[0033] Figure 4 This is a structural schematic diagram of the cover and fastener in an embodiment of this application.

[0034] In the diagram: A. Pump cover structure; B. Power structure; 1. Cover body; 2. Outlet pipe; 21. Pressure stabilizing plate; 22. Pressure stabilizing chamber; 3. Inlet pipe; 4. Return component; 41. Return section; 411. Fixing component; 412. Mounting component; 413. Sealing ring; 414. Buckle; 4141. Bayonet; 415. Buckle; 416. Return chamber; 417. Pressure relief outlet; 418. Pressure relief inlet; 4181. Positioning platform; 419. Guide slide platform; 4191. Guide groove; 42. Pressure control opening and closing part; 421. Plug; 422. Elastic component. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-4This application will be described in further detail.

[0036] This application discloses a miniature diaphragm water pump, mainly used for fluid transport. The transported fluid can be gas or other liquids. The term "water pump" in the name is for convenience only, and the actual scope of protection includes scenarios involving the use of gas or other liquids.

[0037] Reference Figure 1 and Figure 2 A miniature diaphragm water pump includes a pump cover structure A and a power structure B that drives fluid to flow within the pump cover structure A. The core protection point of this application lies in the high flow accuracy diaphragm pump cover structure A. The power structure B is common knowledge well-known to those skilled in the art, and will not be described in detail in this embodiment. For specific details, please refer to, for example, the miniature water-air pump with authorization publication number CN221921242U and the novel water-air dual-purpose miniature pump with authorization publication number CN219197578U.

[0038] Reference Figure 2 and Figure 3 The high-flow-precision diaphragm pump cover structure A includes a cover body 1, an outlet pipe 2, an inlet pipe 3, and a return component 4. The cover body 1, outlet pipe 2, and inlet pipe 3 are all made of plastic and are fixedly connected by integral molding. The axis of the outlet pipe 2 and the axis of the inlet pipe 3 can be parallel, perpendicular, intersecting, or non-intersecting according to actual design requirements.

[0039] The water outlet pipe 2 has a water outlet, and a pressure stabilizing plate 21 is installed inside the water outlet pipe 2. The pressure stabilizing plate 21 partially blocks the water outlet to form a pressure stabilizing cavity 22 inside the water outlet pipe 2. In this embodiment, the pressure stabilizing plate 21 is arranged in a ring shape, the axis of the inner hole of the pressure stabilizing plate 21 coincides with the axis of the water outlet pipe 2, and the outer ring of the pressure stabilizing plate 21 coincides with the inner wall of the water outlet pipe 2. The pressure stabilizing plate 21 is located at the water outlet and is integrally formed with the water outlet pipe 2.

[0040] Reference Figure 3 and Figure 4 The return component 4 includes a return section 41 and a pressure control opening and closing section 42. The return section 41 is mainly used to form a return channel for fluid flow, and the pressure control opening and closing section 42 is used to control the opening and closing of the return channel in the return section 41 to control whether the return channel is flowing.

[0041] The pressure control opening and closing part 42 includes a plug 421 and an elastic element 422. The plug 421 is made of rubber or silicone to have a certain elasticity, and the elastic element 422 can be a compression spring or a spring sheet. In this embodiment, the elastic element 422 is a compression spring. The plug 421 includes a working head and a connecting handle. The compression spring is sleeved on the connecting handle to drive the working head to close the return channel. If the diameter of the connecting handle is smaller than the outer diameter of the compression spring, a hole can be opened on the end face of the connecting handle to allow the end of the compression spring to be inserted. The size of the inner hole of the pressure stabilizing plate 21 (the area of ​​the outlet of the water pipe 2 after being blocked by the pressure stabilizing plate 21) is designed and adjusted according to actual needs so that the target pressure value of the pressure stabilizing chamber 22 is adapted to the elastic force value of the elastic element 422.

[0042] Reference Figure 3 and Figure 4 The return flow section 41 includes a fixing member 411, a mounting member 412, and a sealing ring 413. The fixing member 411 and mounting member 412 are both made of plastic, while the sealing ring 413 is made of rubber or silicone to provide a certain degree of elasticity. The fixing member 411 is integrally molded and simultaneously fixed to both the outlet pipe 2 and the inlet pipe 3. The sealing ring 413 is sandwiched between the mounting member 412 and the fixing member 411 to ensure a tight seal between them. The mounting member 412 or the fixing member 411 is provided with a snap fastener 414, which connects the fixing member 411 and the mounting member 412. There are at least two snap fasteners 414, located on opposite sides. In this embodiment, the buckle 414 is located on the mounting member 412. The buckle 414 has a slot 4141, and the fixing member 411 has a buckle head 415 for inserting the buckle 414. During installation, the buckle head 415 is inserted into the slot 4141 of the corresponding buckle 414. There are four buckles 414, with each pair of buckles 414 forming a group. Each group of buckles 414 is located on two opposite sides of the mounting member 412.

[0043] A return flow cavity 416 is formed between the fixing member 411 and the mounting member 412, and the return flow cavity 416 is located within the area of ​​the sealing ring 413. Depending on the actual design requirements, the return flow cavity 416 can be entirely located on the fixing member 411, entirely on the mounting member 412, or partially on the mounting member 412 and partially on the fixing member 411. In this embodiment, the flow path of the return flow cavity 416 is arranged in an "S" shape.

[0044] The fixing component 411 is provided with a pressure relief outlet 417 and a pressure relief inlet 418. The pressure relief inlet 418 is located on the side of the pressure stabilizing plate 21 near the cover 1, and the pressure stabilizing chamber 22 is located between the pressure relief inlet 418 and the water outlet. One end of the pressure relief outlet 417 is connected to the return chamber 416 and the other end is connected to the water inlet pipe 3. One end of the pressure relief inlet 418 is connected to the return chamber 416 and the other end is connected to the water outlet pipe 2. The pressure relief inlet 418, the return chamber 416, and the pressure relief outlet 417 form a complete return flow path. When the water flow in the pressure stabilizing chamber 22 increases, the fluid pressure causes the plug 421 to overcome the elastic force of the elastic component 422, thereby opening the pressure relief inlet 418. Excess water will pass through the pressure relief inlet 418, the return chamber 416, and the pressure relief outlet 417 in sequence before entering the water inlet pipe 3, thus completing the return flow pressure stabilization.

[0045] Reference Figure 3 and Figure 4 To improve the stability of the plug 421 in opening and closing the pressure relief inlet 418, the return cavity 416 has a guide section and a mounting section. The axes of both the guide section and the mounting section coincide with the axis of the pressure relief inlet 418, and the mounting section is located at the end of the guide section away from the pressure relief inlet 418. An elastic element 422 is mounted on the mounting section to apply pressure to the plug 421 toward the pressure relief inlet 418. The inner wall of the guide section is provided with multiple guide slides 419. The multiple guide slides 419 are arranged circumferentially with the axis of the pressure relief inlet 418 as the center. The guide slides 419 extend in a straight line or bend along the direction close to the pressure relief inlet 418. The cross-section of the guide slides 419 can be trapezoidal, rectangular or arc, etc. A guide groove 4191 is formed between two adjacent guide slides 419. The extension direction of the guide groove 4191 is the same as the axial direction of the pressure relief inlet 418. The plug 421 slides in the guide section under the action of the elastic element 422. The fluid transported through the pressure relief inlet 418 can directly enter the return cavity 416, or it can enter the return cavity 416 through the guide groove 4191.

[0046] The working head of the plug 421 has a working surface for sealing the pressure relief inlet 418. The working surface gradually bulges from the edge to the center, and the bulge can be in the form of an arc, a cone, a polygonal pyramid, etc. In this embodiment, the working surface is an arc surface. The opening end face of the pressure relief inlet 418 is provided with a positioning platform 4181 for cooperating with the working surface of the plug 421. The arc surface makes the contact between the working surface and the pressure relief inlet 418 more uniform. Especially when the plug 421 is just beginning to move away from the pressure relief inlet 418, the opening area between the pressure relief inlet 418 and the working surface of the plug 421 increases proportionally. At this time, the pressure of the water flowing back through the pressure relief inlet 418 will be more stable.

[0047] The implementation principle of a miniature diaphragm water pump according to an embodiment of this application is as follows: when water is pumped into the pump and passes through the pressure stabilizing plate 21 of the outlet pipe 2, a stable internal pressure is formed in the pressure stabilizing chamber 22; when the water flow in the pressure stabilizing chamber 22 increases, the fluid pressure causes the push plug 421 to overcome the elastic force of the elastic element 422 so that the pressure relief inlet 418 is opened, and the excess water will pass through the pressure relief inlet 418, the return chamber 416 and the pressure relief outlet 417 in sequence before entering the inlet pipe 3, thereby completing the pressure relief in the outlet pipe 2 so that the pressure inside the pump remains stable.

[0048] The embodiments described herein are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be included within the scope of protection of this application.

Claims

1. A high-flow-precision diaphragm pump cover structure, characterized in that, The device includes a cover (1), an outlet pipe (2), an inlet pipe (3), and a return component (4). The outlet pipe (2) and the inlet pipe (3) are fixedly connected to the cover (1). The return component (4) includes a return section (41) and a pressure control opening and closing section (42) for controlling the opening and closing of the return section (41). The return section (41) has a pressure relief outlet (417) connected to the inlet pipe (3) and a pressure relief inlet (418) connected to the outlet pipe (2). The outlet pipe (2) has an outlet. A pressure stabilizing plate (21) is provided inside the outlet pipe (2). A pressure stabilizing cavity (22) is formed on the side of the pressure stabilizing plate (21) away from the outlet of the outlet pipe (2).

2. The high-flow-precision diaphragm pump cover structure according to claim 1, characterized in that, The pressure control opening and closing part (42) includes a plug (421) for opening and closing the pressure relief inlet (418) and an elastic member (422) for driving the plug (421) to press against the pressure relief inlet (418). The plug (421) has a working surface for sealing the pressure relief inlet (418), and the working surface gradually protrudes from the edge to the center.

3. The high-flow-precision diaphragm pump cover structure according to claim 2, characterized in that, The working surface is a circular arc surface.

4. The high-flow-precision diaphragm pump cover structure according to claim 3, characterized in that, The opening end face of the pressure relief inlet (418) is provided with a positioning platform (4181) for cooperating with the working surface of the plug (421).

5. The high-flow-precision diaphragm pump cover structure according to claim 1, characterized in that, The return section (41) includes a fixing member (411) and a mounting member (412) installed on the fixing member (411). The fixing member (411) is fixedly connected to the water inlet pipe (3) and the water outlet pipe (2). A return cavity (416) is formed between the fixing member (411) and the mounting member (412).

6. The high-flow-precision diaphragm pump cover structure according to claim 5, characterized in that, The mounting component (412) or the fixing component (411) is provided with a buckle (414), and the fixing component (411) and the mounting component (412) are connected by the buckle (414).

7. The high-flow-precision diaphragm pump cover structure according to claim 6, characterized in that, When the buckle (414) is located on the mounting member (412), the buckle (414) has a snap (4141), the fixing member (411) has a buckle (415) for inserting the buckle (414), the number of buckles (414) is at least two, and at least two buckles (414) are located on opposite sides of the mounting member (412).

8. The high-flow-precision diaphragm pump cover structure according to claim 5, characterized in that, The return cavity (416) has a guide section for the plug (421) to slide. The inner wall of the guide section is provided with a plurality of guide platforms (419), and a guide groove (4191) is formed between two adjacent guide platforms (419).

9. The high-flow-precision diaphragm pump cover structure according to claim 5, characterized in that, A sealing ring (413) is sandwiched between the mounting component (412) and the fixing component (411), and the sealing ring (413) is arranged around the outer ring of the return cavity (416).

10. A miniature diaphragm water pump, characterized in that, Includes the high flow accuracy diaphragm pump cover structure (A) as described in any one of claims 1 to 9.

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