RO132827A2 - Electromechanical vacuum and pressure micropump - Google Patents

Abstract

The invention relates to an electromechanical vacuum and pressure micropump manufactured on the basis of two current-controlled spring systems made of Nitinol, a memory shape material, being meant to regulate the pressure inside a fluid enclosure. According to the invention, the micropump mainly comprises a cylindrical container with fluid (1) fastened on a fixed support plate (2) and provided, at one end, with a piston (5) rigidly fastened to a mobile plate (6) whose bidirectional displacement is controlled by two systems formed by six springs (7 and 7') made of Nitinol, and, at the opposite end of the container (1) with a hole provided with an elastic pipe (8), wherethrough a manometer (9) for measuring the pressure inside the cylindrical fluid container (1) is connected, the control of bidirectional displacement of the piston (5), which regulates the pressure within the cylindrical fluid container (1), being carried out by alternately supplying finely adjustable voltage to each spring system (7 and 7') made of Nitinol from a voltage source.

Description

Electromechanical vacuum and pressure micro pump

The invention relates to a vacuum and pressure electromechanical micropump pump made on the basis of two current-controlled Nitinol (shape memory material) springs for regulating the pressure inside a fluid chamber.

In order to change the fluid pressure in an enclosure, a solution is known (Tisan, Vasile; Machines in the food industry, vol. II, Risoprint Publishing House, Cluj Napoca, 2009), consisting mainly of a piston system driven by an electric motor. by a crank system.

The disadvantages of the described solution consist in the fact that the use of electric motor drive systems leads to difficult pressure control, large errors, and constructive to the complexity of the execution, which results in increased cost and diminished safety in operation.

The technical problems that the invention solves consist in the constructive simplicity of the micropump, as well as the increase of the precision with which the fluid pressure inside the enclosure is controlled.

Electromechanical vacuum and pressure micro pump, according to the invention, removes the disadvantages presented by the fact that it consists mainly of a piston that regulates the pressure inside a fluid chamber, actuated by two Nitinol spring systems (shape memory material) controlled by a finely adjustable voltage supply, to control the intensity of the electric current that produces the Nitinol heating through the Joule effect.

The invention has the following advantages:

- high pressure regulation accuracy;

a2017 00152

14/03/2017

- low cost price; constructive simplicity; high operational safety.

The following is an example of an embodiment of the invention in connection with Figure 1, which represents a longitudinal section through a micropump.

The vacuum and pressure electromechanical micro-pump, according to the invention (fig. 1), consists mainly of a cylindrical fluid container 1 fixed on a fixed support plate 2, positioned on two metal guides 4 and 4 'and which container is provided at one end with a piston 5, rigidly fixed by a movable plate 6, whose bidirectional displacement is controlled by two systems consisting of six Nitinol 7 and 7 'springs which in turn are attached to one end of the movable plate 6 sliding on the guides, and at the other end of the fixed support plates 3 and 3 ', respectively, plates fixed on the guides 4 and 4' so as to allow the pretensioning of the systems of springs. The bidirectional displacement control of the piston is performed by supplying a finely adjustable voltage, alternatively, of a system of springs, at terminals 11 and 11 ', from a voltage source not shown in the figure, in order to increase or decrease the pressure from enclosure 1.

An orifice is provided at the opposite end of the cylindrical container 1, provided with an elastic pipe 8 through which the pressure gauge 9 is connected to measure the pressure inside the cylindrical container with fluid 1.

the whole assembly thus constituted by the cylindrical container of fluid 1 and the four fixed and movable support plates are fixed on a support plate 10.

The electromechanical vacuum and pressure micro pump, according to the invention, can be reproduced with the same characteristics and performances whenever necessary, which is an argument in favor of respecting the criterion of industrial applicability.

to 2017 00152

14/03/2017

Bibliographic references [1]. Tisan, Vasile; Equipment in the food industry, you. II, Risoprint Publishing House, Cluj Napoca, 2009;

Claims (2)

claims 1. The vacuum and pressure electromechanical micropump, according to the invention characterized in that it consists, mainly of a cylindrical fluid container (1) fixed on a fixed support plate (2), provided at one end with a piston (5) , rigidly fixed by a movable plate (6), the bidirectional displacement of which is controlled by two systems consisting of six Nitinol springs (7) and (7 '), and at the opposite end of the cylindrical container (1) an orifice is made provided with an elastic pipe (8) through which the pressure gauge (9) is connected for measuring the pressure inside the cylindrical fluid container (1). 2. The pump, according to claim 1, characterized in that the bidirectional displacement of the piston, which regulates the pressure in the cylindrical fluid container (1), is achieved by supplying a finely adjustable voltage, alternatively, to a Nitinol spring system (7). ) and (7 ') from a voltage source.