# US 2021/0277909 A1 · Vacuum pump, particularly for apparatuses for food preservation

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- Number: US 2021/0277909 A1
- Document ID: US20210277909A1
- Status: Published application
- Kind: A1
- Application number: 17/190,930
- Filed: 2021-03-03
- Published: 2021-09-09
- Earliest claimed: 2020-03-04
- Inventors: Marziano SALVARO
- Web page: https://patentgrep.com/patent/US20210277909A1

## CPC

- F04C 25/02: for producing high vacuum (sealing arrangements F04C27/00; silencing F04C29/06)
- F04D 27/004: {by varying driving speed}
- A23B 2/001: {Details of apparatus, e.g. pressure feed valves or for transport, or loading or unloading manipulation}
- A23B 2/103: {using sub- or super-atmospheric pressures, or pressure variations transmitted by a liquid or gas}
- B65B 25/001: {of foodstuffs, combined with their conservation (B65B25/041, B65B25/062, B65B25/067 take precedence)}
- B65B 31/04: Evacuating, pressurising or gasifying filled containers or wrappers by means of nozzles through which air or other gas, e.g. an inert gas, is withdrawn or supplied
- F04B 49/06: Control using electricity (regulating by means of floats actuating electric switches F04B49/04)
- F04D 25/06: the pump being electrically driven (F04D25/08 takes precedence)
- A23V 2002/00: Food compositions, function of food ingredients or processes for food or foodstuffs
- F04B 17/03: driven by electric motors
- F04B 49/02: Stopping, starting, unloading or idling control
- F04C 28/08: characterised by varying the rotational speed
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- A23B: PRESERVATION OF FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES; CHEMICAL RIPENING OF FRUIT OR VEGETABLES
- B65B: MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING (bundling and pressing devices for cigars A24C1/44; devices for tensioning and securing binders adapted to be supported by the article or articles to be bound B25B25/00; applying closure members to bottles, jars or similar containers B67B1/00-B67B6/00; concurrent cleaning, filling and closing of bottles B67C7/00; emptying bottles, jars, cans, casks, barrels or similar containers B67C9/00)
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)
- A23V: INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION

## 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

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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