阅读说明：本技术 一种微泵 (Micropump ) 是由 苏小青 张西良 袁俊 孙军 陈成 郝秀春 于 2021-06-23 设计创作，主要内容包括：本发明提供一种微泵,包括储水腔、泵腔、驱动膜、伸缩机构和驱动机构；储水腔的底部设有连通的泵腔、且储水腔和泵腔连接处设有进水口止回阀；泵腔的出水口设有出水口止回阀；驱动膜设置在泵腔内的底部；伸缩机构设置在泵腔的下方,伸缩机构的一端与驱动膜连接,另一端与驱动机构,驱动机构驱动伸缩机构带动驱动膜在泵腔内伸展或者缩回,从而控制泵腔的容积,当驱动膜向上伸展时,泵腔容积减小,泵腔内部的水通过出水口止回阀排出,驱动膜向下缩回时,泵腔容积增大,出水口止回阀起到防止流出去的水倒吸入泵腔,储水腔内的水通过送水口流经进水口止回阀再通过进水口进入泵腔内,解决现有微泵储水不足,存在渗漏水的问题。(The invention provides a micropump, which comprises a water storage cavity, a pump cavity, a driving membrane, a telescopic mechanism and a driving mechanism, wherein the water storage cavity is provided with a water inlet and a water outlet; the bottom of the water storage cavity is provided with a communicated pump cavity, and a water inlet check valve is arranged at the joint of the water storage cavity and the pump cavity; a water outlet check valve is arranged at the water outlet of the pump cavity; the driving membrane is arranged at the bottom in the pump cavity; the telescopic machanism sets up the below at the pump chamber, telescopic machanism's one end and drive membrane are connected, the other end and actuating mechanism, actuating mechanism drive telescopic machanism drives the drive membrane and stretches out or retract in the pump chamber, thereby control the volume of pump chamber, when the drive membrane upwards extends, the pump chamber volume reduces, the inside water of pump chamber passes through the delivery port check valve and discharges, when the drive membrane retracts down, the pump chamber volume increases, the delivery port check valve plays the water suck-back pump chamber that prevents to flow out, the water in the water storage chamber flows through the delivery port and flows through the water inlet check valve rethread water inlet and gets into in the pump chamber, it is not enough to solve current micropump water storage, there is the problem of percolating water.)

1. A micro pump is characterized by comprising a water storage cavity (1), a pump cavity (6), a driving membrane (7), a telescopic mechanism (9) and a driving mechanism (10);

the bottom of the water storage cavity (1) is provided with a communicated pump cavity (6), and a water inlet check valve is arranged at the joint of the water storage cavity (1) and the pump cavity (6); a water outlet check valve (8) is arranged at a water outlet (65) of the pump cavity (6); the driving membrane (7) is arranged at the bottom in the pump cavity (6); telescopic machanism (9) set up the below in pump chamber (6), the one end and the drive membrane (7) of telescopic machanism (9) are connected, the other end and actuating mechanism (10), actuating mechanism (10) drive telescopic machanism (9) drive membrane (7) and stretch out or retract in pump chamber (6), thereby control the volume of pump chamber (6), when drive membrane (7) upwards extend, pump chamber (6) volume reduces, the inside water of pump chamber (6) is discharged through delivery port check valve (8), when drive membrane (7) retract downwards, pump chamber (6) volume increase, delivery port check valve (8) play and prevent that the water that flows out from suck-back pump chamber (6), the water in water storage chamber (1) flows through the water inlet check valve through sending the mouth and gets into in pump chamber (6) through the water inlet again.

2. The micropump according to claim 1, wherein a sealing cover (11) is arranged on the top of the water storage cavity (1), a plurality of water feeding ports are arranged on the bottom of the water storage cavity (1), a plurality of water inlet ports are arranged on the top of the pump cavity (6), and the water feeding ports are communicated with the water inlet ports through water inlet check valves.

3. Micropump according to claim 1, characterized in that the outlet check valve (8) comprises a check valve plug (81), a check valve housing (82), a spring (83), a ball (84) and a water channel (85); the middle of the check valve plug (81) at the top of the check valve (8) is provided with a through hole, the cylindrical part at the bottom end of the check valve plug (81) is connected with one end of a spring (83), the other end of the spring (83) is connected with one end of a round ball (84), and the other end of the round ball (84) is propped against the through hole at the bottom of the check valve shell (82).

4. Micropump according to claim 1, characterized in that said telescopic mechanism (9) comprises a slider (91), a fixed track (92), a connecting rod (93), an eccentric (94) and a base (95); the sliding block (91) is connected with the fixed track (92) in a sliding mode, the top end of the sliding block (91) is connected with the top of the driving film (7), the bottom end of the sliding block (91) is rotatably connected with the top end of the connecting rod (93), and the bottom end of the connecting rod (93) is connected with the eccentric wheel (94); the eccentric (94) is connected to the drive mechanism (10).

5. Micropump according to claim 4, characterized in that the sealing process between the slider (91) and the driving membrane (7).

6. Micropump according to claim 1, characterized in that the driving membrane (7) is a bellows.

7. Micropump according to claim 1, characterized in that the drive mechanism (10) is a micromotor.

8. Micropump according to claim 1, characterized in that the pump chamber (6) and drive membrane (7) connection is sealed.

Technical Field

The invention belongs to the field of trace fluid transportation, and particularly relates to a micropump.

Background

When the concentration of hydrogen ions in heterogeneous systems such as soil and matrix is detected on line, and the moisture of the heterogeneous systems such as soil and matrix is insufficient, the surface of a working electrode of the pH sensor and the surrounding aqueous solution are deficient, so that effective hydrogen ions and the aqueous solution thereof are difficult to form on the surface of the working electrode in an accumulated manner, and the accuracy of online detection of the pH sensor is influenced. Therefore, when the moisture of heterogeneous systems such as soil, matrix and the like is insufficient, the micro pump is used for timely supplementing the water. The pH sensor is used for detecting the hydrogen ion concentration pH value of heterogeneous systems such as soil, matrix and the like, has strict requirements on the micropump, needs the micropump to have the functions of storing water and controlling water, has good water storage and control performance, works stably, is portable and easy to use, and has the requirements of simple structure, small volume, low driving and control voltage, low power consumption, high efficiency and low cost.

Micropumps are often used in the field of microfluidics, including piezoelectric, electrostatic, electromagnetic, pneumatic, and the like. The piezoelectric micropump, such as 'a piezoelectric micropump' in the patent with the application number of 201911351963.5, has the advantages of high displacement precision control, capability of outputting millimeter, micron and nanometer-scale displacement or mechanical motion, high response time, low power consumption, high driving performance and the like, but the driving voltage of the piezoelectric micropump is as high as 50V to 80V, and the manufacturing process is complex and does not meet the requirement of usability; an electrostatic micropump, such as 'an electrostatic actuator with a concave electrode and a manufacturing method with low driving voltage' in the patent with the application number of 201710386221.0, utilizes electrostatic force to drive an electrode to generate translational or rotational motion, has a simple manufacturing process, but requires a control voltage higher than that of the piezoelectric type, has a strict requirement on environment, and can not meet the requirement on usability, and the flow rate of the electrostatic micropump can only reach about 6 microliters per minute, so that the requirement on moisture supplement of a local heterogeneous system is difficult to meet; the electromagnetic micropump, the drive mode is to convert the electric energy into the magnetic energy, produce the magnetic field through the coil energization, the magnetizer produces the movement because of the function of force of magnetic field, the structure and its preparation method are comparatively complicated, unsatisfied with the requirement of portability, easy-to-use; pneumatic type micropump adopts compressed air as power, causes the volume change through the reciprocal deformation of film to the realization needs the air after the use compression to the drive of microfluid, consequently needs the air pump, can't satisfy the demand of stability, portability, and realizes that the cost is higher.

At present, the patent with the application number of 201910672387.8, "a self-storing and self-replenishing water pH sensor" already refers to a structure for storing and transporting water by combining a piezoelectric micropump, which can realize the control of water flow, and is used for realizing the pH in-situ detection of heterogeneous systems such as soil, matrix and the like, and improving the accuracy of the pH in-situ detection of the soil and the matrix. However, the disadvantages of the piezoelectric micropump include that the piezoelectric micropump is complex in manufacturing process and needs higher voltage for supporting when in use, which is easy to cause unstable situation due to long-time operation and inconvenient work due to insufficient high voltage supply when in use, which is an inherent defect of the piezoelectric micropump; secondly, when the structure does not work, because the inlet and outlet valves of the micro pump can not keep a sealing state under normal pressure, the water storage is insufficient, and the problem of water leakage and flowing exists.

Therefore, in order to meet the needs of agricultural production, a novel micropump is urgently needed, is low in power supply control voltage, simple in structure, small in size and low in cost, is suitable for being matched with a pH sensor to work, meets the requirements of stable working, portability, easiness in use and the like, is used for supplementing water of heterogeneous systems such as soil, matrixes and the like, and ensures the accuracy of online detection of the pH sensor.

Disclosure of Invention

Aiming at the problems of the prior art, the invention provides a micropump which has the functions of water storage and water leakage prevention, the micropump controls the rotation of a micromotor through low voltage to enable a driving mechanism to drive a telescopic mechanism to move up and down, so as to realize the up-and-down movement of a driving membrane of the micropump, and achieve the effect that the air pressure in a pump cavity is weakened to form negative pressure or enhanced to form positive pressure, so that water is sucked from a water inlet or discharged from a water outlet, the control on micro water flow is realized, the common problem of higher control voltage of the micropump is solved, meanwhile, a water storage cavity is arranged above the pump cavity, a check valve with a certain low pressure threshold value, which has the functions of one-way flow and water backflow prevention and water leakage prevention under normal pressure is arranged at the joint of the water storage cavity and the pump cavity and the water outlet of the pump cavity, the problems of insufficient water storage and water leakage of the conventional micropump are solved, the working stability and the usability of the micropump are improved, so that the micropump is suitable for working in cooperation with a pH sensor, realize the water supplement to heterogeneous systems such as soil, matrix and the like.

The technical scheme of the invention is as follows: a micropump comprises a water storage cavity, a pump cavity, a driving membrane, a telescopic mechanism and a driving mechanism;

the bottom of the water storage cavity is provided with a communicated pump cavity, and a water inlet check valve is arranged at the joint of the water storage cavity and the pump cavity; a water outlet check valve is arranged at the water outlet of the pump cavity; the driving membrane is arranged at the bottom in the pump cavity; the telescopic machanism sets up the below at the pump chamber, telescopic machanism's one end and drive membrane are connected, the other end and actuating mechanism, actuating mechanism drive telescopic machanism drives the drive membrane and stretches out or retract in the pump chamber, thereby control the volume of pump chamber, when the drive membrane upwards extends, the pump chamber volume reduces, the inside water of pump chamber passes through the delivery port check valve and discharges, when the drive membrane retracts downwards, the pump chamber volume increases, the delivery port check valve plays the water that prevents to flow out and inhales the pump chamber backward, the water in the water storage chamber flows through the water inlet check valve rethread water inlet through the delivery port and gets into in the pump chamber.

In the above scheme, the top of water storage chamber is equipped with sealed lid, and water storage chamber bottom is equipped with a plurality of mouths of sending, the top of pump chamber is equipped with a plurality of water inlets, send the mouth of a river and pass through the water inlet check valve intercommunication with the water inlet.

In the above scheme, the water outlet check valve comprises a check valve plug, a check valve shell, a spring, a ball and a water channel; the middle of the check valve plug at the top of the check valve is provided with a through hole, the cylindrical part at the bottom end of the check valve plug is connected with one end of a spring, the other end of the spring is connected with one end of a ball, and the other end of the ball is supported on the through hole at the bottom of the check valve shell.

In the above scheme, the telescopic mechanism comprises a slide block, a fixed track, a connecting rod, an eccentric wheel and a base; the sliding block is connected with the fixed track in a sliding mode, the top end of the sliding block is connected with the top of the driving film, the bottom end of the sliding block is connected with the top end of the connecting rod in a rotating mode, and the bottom end of the connecting rod is connected with the eccentric wheel; the eccentric wheel is connected with the driving mechanism.

Further, the sliding block and the driving film are sealed.

In the above scheme, the driving membrane is a corrugated tube.

In the above scheme, the driving mechanism is a micro motor.

In the scheme, the joint of the pump cavity and the driving membrane is sealed.

Compared with the prior art, the invention has the beneficial effects that: this micropump reciprocates through drive telescopic machanism to drive the upper and lower flexible of drive membrane, realize the purpose to little delivery water volume control, the water storage chamber can save the water simultaneously, and the check valve can prevent the backward flow of water and the seepage flow of water. Meanwhile, the water storage cavity can ensure that the water can be continuously output for a certain volume and a certain time; the expansion and contraction of the driving membrane can control the amount of the output moisture, and the high pressure requirement of piezoelectric type and pneumatic type is not needed; the design of the check valve is used for preventing the backflow of the moisture, and providing a pressure threshold value to prevent the natural flow of the moisture in a normal non-pressurized state, so that the accuracy of the delivered water quantity is ensured; the telescopic mechanism and the driving micro-motor are used as power structures, so that the whole complexity is low, the structure is simple, the stability is high, the usability is good, the requirement on a voltage value is small, and the driving is carried out from 3V to 12V; the overall power consumption of the pump is low; meanwhile, the pump is small in overall size, high in portability and suitable for being matched with a pH sensor to work.

Drawings

FIG. 1 is a schematic view of a micropump in accordance with one embodiment of the present invention.

Fig. 2 is a schematic structural view of a water storage chamber according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of a pump chamber configuration according to an embodiment of the present invention.

Fig. 4 is a schematic view of a telescoping mechanism according to an embodiment of the present invention.

Fig. 5 is a schematic view of a check valve according to an embodiment of the present invention.

In the figure, 1, a water storage cavity; 11. a top sealing cover; 12. a first water delivery port; 13. a second water delivery port; 14. a third water feeding port; 15. a fourth water feeding port; 2. a first check valve; 3. a second check valve; 4. a third check valve; 5. a fourth check valve; 6. a pump chamber; 61. a first water inlet; 62. a second water inlet; 63. a third water inlet; 64. a fourth water inlet; 65. a water outlet; 7. a drive film; 8. a water outlet check valve; 81. a check valve plug; 82. a check valve housing; 83. a spring; 84. a ball; 85. a water passage; 9. a telescoping mechanism; 91. a slider; 92. fixing a track; 93. a connecting rod; 94. an eccentric wheel; 95. a base; 10. the micro-motor is driven.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Fig. 1 shows a preferred embodiment of the micro pump, which includes a water storage chamber 1, a pump chamber 6, a driving membrane 7, a telescoping mechanism 9 and a driving mechanism 10; the bottom of the water storage cavity 1 is provided with a communicated pump cavity 6, and a water inlet check valve is arranged at the joint of the water storage cavity 1 and the pump cavity 6; a water outlet check valve 8 is arranged at a water outlet 65 of the pump cavity 6; the driving membrane 7 is arranged at the bottom in the pump cavity 6, and the joint of the pump cavity 6 and the driving membrane 7 is sealed, so that the air tightness of the whole pump cavity 6 is ensured to be good; telescopic machanism 9 sets up the below at pump chamber 6, telescopic machanism 9's one end is connected with drive membrane 7, the other end and actuating mechanism 10, actuating mechanism 10 drive telescopic machanism 9 drives drive membrane 7 and stretches out or retract in pump chamber 6, thereby control the volume of pump chamber 6, when drive membrane 7 upwards extends, 6 volumes in pump chamber reduce, the inside water in pump chamber 6 passes through delivery port check valve 8 and discharges, when drive membrane 7 retracts downwards, 6 volumes in pump chamber increase, delivery port check valve 8 plays and prevents that the water that flows out suck-back pump chamber 6, water in the water storage chamber 1 flows through the delivery port and flows through in water inlet check valve rethread water inlet gets into in pump chamber 6.

As shown in fig. 2 and 3, according to the present embodiment, it is preferable that a sealing cover 11 is provided on the top of the water storage chamber 1, and water can be filled into the water storage chamber after removing the sealing cover 11, and then the water is stored in the water storage chamber 1 for later delivery of the water to the pump chamber 6. The bottom of the water storage cavity 1 is provided with a plurality of water feeding ports, the top of the pump cavity 6 is provided with a plurality of water inlets, and the water feeding ports are communicated with the water inlets through water inlet check valves. Specifically, the bottom of the water storage cavity 1 is provided with four water feeding ports including a first water feeding port 12, a second water feeding port 13, a third water feeding port 14 and a fourth water feeding port 15; the top of the pump cavity 6 is provided with a plurality of water inlets including a first water inlet 61, a second water inlet 62, a third water inlet 63 and a fourth water inlet 64, and the water feeding ports are communicated with the water inlets through a first check valve 2, a second check valve 3, a third check valve 4 and a fourth check valve 5 of the water inlets respectively.

As shown in fig. 4, according to the present embodiment, it is preferable that the outlet check valve 8 includes a check valve plug 81, a check valve housing 82, a spring 83, a ball 84, and a water passage 85; the middle of the check valve plug 81 at the top of the check valve 8 is a through hole, so that moisture is convenient to transport, the cylindrical part at the bottom end of the check valve plug 81 is connected with one end of a spring 83, the other end of the spring 83 is connected with one end of a round ball 84, and the other end of the round ball 84 abuts against the through hole at the bottom of the check valve shell 82. In fig. 5, the check direction of the water outlet check valve 8 is downward, that is, when water flows through the through hole at the bottom of the water passage 85, the ball 84 is pushed to press the spring 83, and then reaches the through hole of the check valve plug 81 through the water passage 85 and passes through the through hole, and when the water flow has a tendency to flow back, the spring 83 pushes the ball 84 to block the through hole at the bottom of the water passage 85, thereby preventing the water flow from flowing back.

As shown in fig. 5, according to the present embodiment, preferably, the telescopic mechanism 9 includes a slider 91, a fixed rail 92, a connecting rod 93, an eccentric wheel 94 and a base 95; the sliding block 91 is connected with the fixed track 92 in a sliding mode, the top end of the sliding block 91 is connected with the top of the driving film 7, the bottom end of the sliding block 91 is connected with the top end of the connecting rod 93 in a rotating mode, and the bottom end of the connecting rod 93 is connected with the eccentric wheel 94 in a rotating and sliding mode; the eccentric 94 is connected to the drive mechanism 10. When the eccentric wheel 94 rotates, the connecting rod 93 is driven to move, the connecting rod 93 is connected with the sliding block 91 in a rotating mode to form a double-connecting-rod mechanism, the sliding block 91 is driven to move, the sliding block 91 and the fixed rail 92 are connected in a sliding mode and limited in moving freedom degree, the sliding block 91 can only do reciprocating motion in one direction, at the moment, the membrane bellows 7 is driven to stretch under the driving of the sliding block 91, the volume of the pump cavity 6 is changed constantly, and water in the water storage cavity 1 is further led to enter the pump cavity 6 constantly and then is output through the water outlet 65 and the water outlet check valve 8.

The slider 91 is sealed with the driving film 7.

According to the present embodiment, it is preferable that the driving film 7 is a bellows.

According to the present embodiment, the driving mechanism 10 is preferably a micro motor.

The water storage cavity 1 is arranged at the top of the micro-pump structure and used for storing a certain volume of water, and a water feeding port arranged at the bottom of the cavity is connected with a water inlet of a pump cavity 6; the pump cavity 6 is arranged at the lower part of the water storage cavity 1 and is used for obtaining water from the water storage cavity 1 and temporarily storing water to be subjected to micro-output control, and check valves are arranged at the connection part of the water storage cavity 1 and the water inlet of the pump cavity 6 and the water outlet 65 of the pump cavity 6; the driving membrane 7 is arranged at the bottom inside the pump cavity 6 and used for stretching and contracting to control the volume of the pump cavity 6, so that the aim of controlling the micro-delivery water volume is fulfilled; the telescopic mechanism 9 is arranged at the lower part of the pump cavity 6, and the top end of the telescopic mechanism is connected with the top end of the driving membrane 7 and is used for driving the driving membrane 7 to stretch; the micro motor is arranged on one side of the telescopic mechanism 9 and is used for driving the telescopic mechanism 9 to move; the check valve sets up respectively between water storage chamber 1 and pump chamber 6 to and between pump chamber 6 and the raceway, the check valve is provided with certain low pressure threshold, has one-way flow, prevents water reflux and water seepage function under the ordinary pressure state, can solve current micropump water storage not enough, has the problem of percolating water.

It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.