CN104373324A - Valveless piezoelectric pump with side parabola conical flow pipe - Google Patents

Abstract

A valveless piezoelectric pump with side-mounted parabolic cone flow tube 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 parabolic cone flow pipe (5) through the through hole (4) on the side. The parabolic conical flow tube (5) is a conical tube formed by rotating around the axis (12) with a half parabola as the generatrix; the half parabola is half of the parabola divided by the symmetry axis (14); it also includes a connecting The cylindrical tube (8) in the middle of the parabolic cone flow tube (5); the large port (7) and the small port (10) of the parabolic cone flow tube (5) are respectively connected with the external pipeline, and the cylindrical tube (8) passes through The inlet and outlet (6) are connected with the side through hole (4) of the pump body (3). The invention uses the parabolic conical flow tube (5) to realize the unidirectional flow of the fluid with only one guide tube, and has wide application in micro-electromechanical systems.

Description

Side-mounted parabolic cone flow tube valveless piezoelectric pump

technical field

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

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. the

Contents of the invention

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

The side-mounted parabolic cone flow 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 (2 ) is the pump chamber (1), and the pump body (3) is connected to the parabolic cone flow pipe (5) by the through hole (4) on the side. the

The parabolic conical flow tube (5) is a conical tube formed by rotating around the axis (12) with a half parabola as the generatrix; the half parabola is half of the parabola divided by the symmetry axis (14); it also includes a connecting The cylindrical tube (8) in the middle of the parabolic cone flow tube (5); the large port (7) and the small port (10) of the parabolic cone flow tube (5) are respectively connected with the external pipeline, and the cylindrical tube (8) passes through The inlet and outlet (6) are connected with the side through hole (4) of the pump body (3). the

The working principle of the present invention is described as follows:

Two circular piezoelectric vibrators (2) are respectively bonded to two counterbores (9) on the end face of the pump body (3) with the same polarity side; the parabolic cone flow tube (5) is installed on the pump body (3) ) on the through hole (4) side; the parabolic cone flow tube (5) is a tapered tube formed by rotating around the axis (12) with the parabola cone flow tube (5) as a generatrix with the parabola on the half side; The half-side parabola is half of the parabola divided by the axis of symmetry (14); also includes the cylindrical tube (8) connected to the middle part of the parabolic cone flow tube (5); the large port (7) of the parabola cone flow tube (5) ) and the small port (10) are respectively connected with the external pipeline, and the cylindrical pipe (8) is connected with the side through hole (4) of the pump body (3) through the inlet and outlet (6). the

Further, the deflector (13) is installed in the parabolic conical flow pipe (5), and is located in a plane that passes through the axis (12) and is perpendicular to the axis (11) of the cylindrical pipe (8); the deflector (13) One end coincides with the axis (11), and the other end extends toward the port (10) to 1/8-1/6 of the length of the parabolic cone flow tube (5). the

The present invention uses the parabolic cone flow tube (5) to realize the unidirectional flow of the fluid with only one flow guide tube, which simplifies the structure that the traditional valveless piezoelectric pump must be equipped with two flow guide tubes, and makes the valveless piezoelectric pump Pumps can be further miniaturized and have wider potential uses in MEMS. the

Description of drawings

Figure 1(a) Front view of the assembly diagram of the parabolic cone flow tube valveless piezoelectric pump;

Figure 1(b) Top view of the assembly diagram of the parabolic cone flow tube valveless piezoelectric pump;

Figure 2 (a) pump body (3) parts diagram B-B section view;

Figure 2(b) top view of pump body (3) part diagram;

Fig. 3 parabolic cone flow tube (5) parts diagram. the

Detailed ways

The specific embodiment of the present invention is shown in Fig. 1-Fig. 3 . The diameter of the piezoelectric vibrator is 30mm, the diameter of the small port (10) of the parabolic cone flow tube is 5mm, the diameter of the large port (7) is 8mm, the diameter of the cylindrical tube is 4mm, the working voltage is 220V, the frequency is 50Hz, and water is used as the working medium. Flow up to 1900mg/s. the

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 into the pump chamber (1) from the large port (7) and the small port (10) of the parabolic cone flow tube (5) through the inlet and outlet (6) and the through hole (4); when the alternating current changes the pressure direction, it enters the next half During the cycle, the piezoelectric pump enters the scheduling stage, and the two piezoelectric vibrators (2) are respectively bent toward the inner side of the pump chamber (1), the volume of the pump chamber (1) decreases, the pressure rises, and the fluid in the pump chamber (1) passes through The through hole (4) and the inlet and outlet (6) flow into the parabolic conical flow tube (5), and flow out of the large port (7) and the small port (10); (6) to the large port (7) pipeline, the flow resistance of the fluid from the large port (7) to the direction of the inlet and outlet (6) is greater than the flow resistance from the inlet and outlet (6) to the direction of the large port (7), so in a The amount of fluid flowing from the inlet (6) to the large port (7) during the suction and discharge cycle is more than the flow from the large port (7) to the inlet (6); similarly, between the inlet (6) and the small port (3) During a suction-discharge cycle, the flow from the inlet and outlet (6) to the small port (3) is smaller than the flow from the small port (3) to the inlet and outlet (6); Net flow out of port (7). the

Claims (2)

1. The side-mounted parabolic cone flow tube valveless piezoelectric pump is characterized in that: two circular piezoelectric vibrators (2) are installed on the pump body (3) with the same polarity faces facing each other, and the two circular piezoelectric vibrators The cavity between (2) is the pump cavity (1), and the pump body (3) is connected to the parabolic cone flow tube (5) by the through hole (4) on the side; the parabola cone flow tube (5) is one and a half The side parabola is the generatrix, which is formed by rotating around the axis (12); the half side parabola is half of the parabola divided by the symmetry axis (14); it also includes a cylinder connected to the middle of the parabolic cone flow tube (5) The large port (7) and the small port (10) of the parabolic conical flow pipe (5) are respectively connected with the external pipeline, and the cylindrical pipe (8) passes through the inlet and outlet (6) and the pump body (3) The side through holes (4) are connected. 2. The side-mounted parabolic conical flow tube valveless piezoelectric pump according to claim 1, characterized in that: the deflector (13) is installed in the parabolic conical flow tube (5), and installed on the passing axis (12) And in the plane perpendicular to the axis (11) of the cylindrical tube (8); one end of the deflector (13) coincides with the axis (11), and the other end extends to the small port (10) direction to the parabolic cone flow tube (5) 1/8-1/6 of the length.