CN104481851B - Paraxonic tandem Valveless piezoelectric pump - Google Patents

Abstract

The utility model relates to a valveless piezoelectric pump with side-axis series tubes, which belongs to the field of fluid machinery. It is characterized in that: two circular piezoelectric vibrators (2) are installed on the pump body (3) with faces of the same polarity facing each other, and the cavity between the two circular piezoelectric vibrators (2) is the pump cavity (1) , the pump body (3) is connected to the paraxial series tube flow tube (5) by the through hole (4) on the side; It is formed in series in order of size, and is connected in such a way that the axes are coplanar and the busbars overlap. A cylindrical connecting pipe (8) is installed perpendicular to the axis in the middle of the paraxial series pipe flow pipe (5); the cylindrical connecting pipe (8) and The side through holes (4) of the pump body (3) are connected; the large port (7) and the small port (18) of the paraxial tandem tube (5) are connected with external pipelines. The invention uses the side-axis serial tube flow tube (5) to realize the unidirectional flow of the fluid with only one guide tube, and has wide applications in micro-electromechanical systems.

Description

Side-axis tandem valveless piezoelectric pump

technical field

The invention relates to a valveless piezoelectric pump, which belongs to the field of fluid machinery.

Background technique

The valveless piezoelectric pump has a simple structure, no mechanical transmission chain, high reliability, high electromechanical conversion efficiency, and is easy to be miniaturized. It has broad application prospects in medical and health care, aerospace, and micro-electromechanical systems.

Contents of the invention

Fig. 1 is a structural diagram of the valveless piezoelectric pump of the present invention.

The side-axis series tube valveless piezoelectric pump is characterized in that: two circular piezoelectric vibrators (2) are installed on the pump body (3) with faces of the same polarity facing each other, and the two circular piezoelectric vibrators (2) The cavity between them is the pump chamber (1), and the pump body (3) is connected to the side shaft series tube flow tube (5) through the side through hole (4); the side shaft series tube flow tube (5) is formed by Several sections of cylindrical pipes with different diameters are connected in series according to the order of diameters, and are connected in such a way that the axes are coplanar and the busbars overlap. A cylindrical connecting pipe ( 8); the cylindrical connection pipe (8) is connected with the side through hole (4) of the pump body (3); the large port (7) and the small port (18) of the side-axis series tube flow pipe (5) are respectively connected with External piping connection. The working principle of the side-axis tandem tube valveless piezoelectric pump proposed by the present invention is described as follows:

The two circular piezoelectric vibrators (2) are respectively bonded to the two counterbores (12) on the end face of the pump body (3) with the same polarity side; On the through hole (4) on the side of the body (3); the paraxial tandem tube flow tube (5) is formed by series connection of several sections of cylindrical tubes with different diameters in order of diameter, with the axes coplanar and the busbars overlapping Connect by way, and install cylindrical connecting pipe (8) perpendicular to the axis in the middle part of the paraxial tandem pipe flow pipe (5). The large port (7) and the small port (18) of the paraxial tandem pipe flow pipe (5) are respectively connected with external pipelines.

Further, the paraxial tandem tube flow tube (5) is composed of three sections of cylindrical tubes with different diameters connected in series according to the order of diameter, which are respectively the large-diameter tube (11), the medium-diameter tube (10) and the small-diameter tube (9 ); the axis (16) of the cylindrical connecting pipe (8) is positioned at the axis (13) of the small diameter pipe (9), the axis (17) of the medium diameter pipe (10) and the axis (14) of the large diameter pipe (11) constitute In the plane and perpendicular to the common busbar (15); the cylindrical connection pipe (8) is connected with the side through hole (4) of the pump body (3) through the inlet and outlet (6).

Further, the deflector (19) is a flat plate, installed on the axis (17) of the middle diameter pipe (10) and installed in a plane perpendicular to the cylindrical connecting pipe (8); one end of the deflector (19) Coincident with the axis of the cylindrical connecting pipe (8), the other end extends to the side of the small diameter pipe (9) to 1/4th to 1/3rd of the length of the middle diameter pipe (10).

The present invention uses side-axis series tube flow tube (5) to realize the unidirectional flow of fluid with only one guide tube, which simplifies the structure that two guide tubes must be installed in the traditional valveless piezoelectric pump, so that there is no Valve piezoelectric pumps can be miniaturized and have wider potential applications in microelectromechanical systems.

Description of drawings

Fig. 1(a) Front view of side-axis tandem tube flow tube valveless piezoelectric pump;

Figure 1(b) Top view of side-axis series tube flow tube valveless piezoelectric pump

Fig. 2 (a) pump body (3) B-B sectional view;

Figure 2 (b) pump body (3) top view;

Fig. 3 (a) front view of side-axis tandem tube flow tube (5);

Fig. 3 (b) is a top view of the paraxial tandem flow tube (5).

detailed description

In the embodiment of the present invention, three sections of cylindrical pipes with different diameters are used, which are respectively small diameter pipe (9), medium diameter pipe (10) and large diameter pipe (11); the axis (13) of small diameter pipe (9), medium diameter The axis (17) of the pipe (10) and the axis (14) of the large-diameter pipe (11) are located in the same plane; in this plane, the small-diameter pipe (9), the medium-diameter pipe (10) and the inner wall of the large-diameter pipe (11) The busbars on the same side overlap to form a common busbar (15); the specific embodiment of the present invention is shown in Fig. 1-Fig. 3 . The diameter of the piezoelectric vibrator is 30 mm, the diameter of the small port (18) of the paraxial series tube flow tube is 4 mm, the inner diameter of the middle diameter tube is 8 mm, the diameter of the large port (7) is 8 mm, and the diameter of the cylindrical tube (8) is 4 mm. The voltage is 220V, the frequency is 50Hz, water is used as the working medium, and the flow rate is up to 2150mg/s.

When the piezoelectric pump is connected to the AC power supply, the two piezoelectric vibrators (2) bend to the outside of the pump chamber (1) during one and a half cycles of the alternating current, and the pressure in the pump chamber (1) drops. The fluid flows from the large port (7) and the small port (18) of the paraxial series tube flow tube (5), through the inlet and outlet (6), and the side hole (4) into the pump chamber (1); when the alternating current changes direction, it enters the lower During one and a half periods, the piezoelectric pump enters the scheduling stage, and the two piezoelectric vibrators (2) respectively bend toward the inner side of the pump chamber (1), the volume of the pump chamber (1) decreases, the pressure rises, and the pressure in the pump chamber (1) The fluid flows into the paraxial series tube flow tube (5) through the through hole (4) and the inlet and outlet (6), and flows out of the large port (7) and the small port (18); The effect of the reducer, between the inlet and outlet (6) and the large port (7), the flow resistance of the fluid flowing from the large port (7) to the inlet and outlet (6) is greater than that from the inlet and outlet (6) to the large port (7) Direction of flow resistance, so the amount of fluid flowing from the inlet and outlet (6) to the large port (7) is more than the flow from the large port (7) to the inlet and outlet (6) in one suction and discharge cycle; similarly, at the inlet and outlet (6) and the outlet of the small port (18), the flow from the inlet and outlet (6) to the small port (18) in a suction stroke cycle is smaller than the flow from the small port (18) to the inlet and outlet (6); Net flow in from port (18) and out from large port (7).

Claims (3)

1. The side-axis tandem tube valveless piezoelectric pump is characterized in that two circular piezoelectric vibrators (2) with the same polarity are installed on the pump body (3) oppositely, and the two circular piezoelectric vibrators ( The cavity between 2) is the pump cavity (1), and the pump body (3) is connected to the side shaft series tube flow tube (5) through the side through hole (4); the side shaft series tube flow tube (5) ) is composed of several sections of cylindrical tubes with different diameters connected in series according to the order of diameters, and connected in such a way that the axes are coplanar and the busbars overlap, and a cylindrical connection is installed perpendicular to the axis in the middle of the paraxial series tube flow tube (5) Tube (8); the cylindrical connection tube (8) is connected with the side through hole (4) of the pump body (3); the large port (7) and the small port (18) of the paraxial series tube flow tube (5) Connect with the external pipeline respectively. 2. The valveless piezoelectric pump with side-axis tandem tubes according to claim 1, characterized in that: the side-axis tandem tube flow tube (5) consists of three sections of cylindrical tubes with different diameters connected in series according to the order of diameter. into, respectively large-diameter pipe (11), medium-diameter pipe (10) and small-diameter pipe (9); In the plane formed by the axis (17) of the pipe (10) and the axis (14) of the large-diameter pipe (11), and perpendicular to the common busbar (15), the common busbar (15) is the small-diameter pipe (9), and the middle-diameter pipe ( 10) A busbar overlapping with the busbar on the same side of the large-diameter pipe (11) inner wall. 3. The side-axis tandem tube valveless piezoelectric pump according to claim 2, characterized in that: the deflector (19) is a flat plate, installed on the axis (17) of the middle-diameter tube (10) and installed In the plane perpendicular to the cylindrical connecting pipe (8); one end of the deflector (19) coincides with the axis of the cylindrical connecting pipe (8), and the other end extends to the small diameter pipe (9) to the middle diameter pipe (10 ) from one quarter to one third of its length.