VACUUM PUMP, PARTICULARLY FOR APPARATUSES FOR FOOD PRESERVATION

Abstract

A vacuum pump, particularly for apparatuses for food preservation, which includes a pump body, the peculiarity of which is that it includes a permanent-magnet motor with variable rotation rate which is adapted to control the pump, and an electronic power and control board, controlled by the permanent-magnet motor with variable rotation rate.

Claims

1. A vacuum pump comprises a pump body, comprising a permanent-magnet motor with variable rotation rate which is adapted to control said pump, and an electronic power and control board, controlled by said permanent-magnet motor with variable rotation rate.

2. The pump according to claim 1, wherein said electronic power and control board is configured to use a variation of viscosity of an oil of the pump as a function of variation of the resistive torque.

3. The pump according to claim 1, wherein said electronic power and control board is configured to read variation in power absorbed by said permanent-magnet motor with variable rotation rate as a variation of a current generated by a variation of the magnetic field.

4. The pump according to claim 1, wherein said electronic power and control board is configured to optimize a torque demand of said permanent-magnet motor with variable rotation rate.

5. The pump according to claim 1, wherein said electronic power and control board is configured to define start-stop profiles with ramping-up or ramping-down for said permanent-magnet motor with variable rotation rate.

6. An apparatus for food preservation, comprising a vacuum pump according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0017] Further characteristics and advantages of the disclosure will become better apparent from the detailed description of a preferred, but not exclusive, embodiment of the pump according to the disclosure, illustrated by way of non-limiting example in the accompanying drawings, wherein the single FIGURE is an exploded perspective view of the pump according to the present disclosure.

DETAILED DESCRIPTION OF THE DRAWING

[0018] With reference to the FIGURE, the pump according to the present disclosure, generally designated by the reference numeral 1, comprises a pump body 2, a permanent-magnet motor with variable rotation rate 3 which is adapted to control the pump body 2, and an electronic power and control board 4 which is designed to control the permanent-magnet motor with variable rotation rate 3.

[0019] Conveniently, the electronic board 4 is capable of controlling the torque exerted by the motor by deriving from such information an evaluation of the variation of the viscosity of the oil of the pump, as a function of the variation of the resistive torque.

[0020] A change in power absorbed by the motor is read by the electronic board 4 as a change in the current generated by the change in the magnetic field, and is therefore easily measurable even for small changes, without the presence of any dedicated sensor.

[0021] It has been found that under operating conditions the vacuum pump with permanent-magnet motor with variable rotation rate absorbs approximately 36% less than an identical pump with a conventional asynchronous motor.

[0022] Even at breakaway, the pump with permanent-magnet motor with variable rotation rate absorbs approximately 30% less power.

[0023] Furthermore, the starting of the pump can be controlled with a ramping-up of current or with a change in rotation frequency which, for the same torque required, optimizes the power yielded.

[0024] In general, the torque of the pump, by virtue of the presence of the permanent-magnet motor with variable rotation rate, can be optimized for all the load conditions of the pump, thus optimizing the overall operation thereof.

[0025] The presence of a permanent-magnet motor with variable rotation rate with a corresponding power and control board 4 makes it possible, via control algorithms, to control functions that are usually entrusted to the presence of sensors.

[0026] Furthermore, it is possible to obtain a reduction in size of a single vacuum pump, electric motor and electronic board compared to a vacuum pump fitted with a conventional asynchronous motor.

[0027] In general, the power and control board is configured to define start-stop profiles with ramping-up or ramping-down for the permanent-magnet motor with variable rotation rate.

[0028] In practice it has been found that the pump according to the disclosure fully achieves the set aim and objects, in that it makes it possible to have an optimized operation by virtue of the presence of a permanent-magnet motor with variable rotation rate with an electronic power and control board.

[0029] The pump thus conceived is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims.

[0030] Moreover, all the details may be substituted by other, technically equivalent elements.

[0031] In practice, the materials used, as well as the contingent shapes and dimensions, may be any according to the requirements and to the state of the art.