Open-end spinning device with an intermediate chamber

An open-end spinning device of a rotor spinning machine, comprising:

• a spinning rotor having a rotor cup in which fiber material is spun;
• a rotor shaft through which the spinning rotor is driven, the rotor shaft arranged in a bearing with an individual drive for driving the spinning rotor;
• a rotor housing in which the rotor cup is arranged, the rotor housing impinged with spinning negative pressure (pSU) through a negative pressure channel;
• a drive housing in which the rotor shaft extends and in which the drive and bearing of the spinning rotor are arranged;
• the rotor housing and the drive housing spaced apart from one another in an axial direction of the rotor shaft;
• an intermediate chamber arranged between the rotor housing and the drive housing, the intermediate chamber having a first connecting opening to the rotor housing and a second connecting opening to the drive housing;
• the intermediate chamber having a third opening through which the intermediate chamber is connected to a negative pressure source when spinning operation of the open-end spinning device is interrupted;
• and
• wherein the intermediate chamber is connected to the negative pressure channel for the spinning negative pressure (pSU) or to an own negative pressure channel through the third opening.

A method to operate an open-end spinning device of a rotor spinning machine wherein the open-end spinning device includes:

• a spinning rotor driven by an individual drive;
• a spinning rotor arranged in a contactless way in a bearing, the spinning rotor including a rotor cup and with a rotor shaft;
• the rotor cup arranged in a rotor housing impinged with spinning negative pressure (pSU) during spinning operation;
• the rotor shaft extending into a drive housing in which the drive and the bearing of the spinning rotor are arranged;
• wherein the method further comprises:
• preventing an air current from the rotor housing to the drive housing by spacing the rotor housing and the drive housing from each other in axial direction of the rotor shaft;
• enclosing an intermediate chamber with walls between the rotor housing and the drive housing;
• defining a first connecting opening from the intermediate chamber to the rotor housing around the rotor shaft, and a second connecting opening from the intermediate chamber to the drive housing around the rotor shaft;
• and
• impinging the intermediate chamber with negative pressure when the spinning operation is interrupted and the rotor housing is opened such that an air current is prevented from entering the drive housing.

A method to operate an open-end spinning device of a rotor spinning machine wherein the open-end spinning device includes:

• a spinning rotor driven by an individual drive;
• a spinning rotor arranged in a contactless way in a bearing, the spinning rotor including a rotor cup and with a rotor shaft;
• the rotor cup arranged in a rotor housing impinged with spinning negative pressure (pSU) during spinning operation;
• the rotor shaft extending into a drive housing in which the drive and the bearing of the spinning rotor are arranged;
• wherein the method further comprises:
• preventing an air current from the rotor housing to the drive housing by spacing the rotor housing and the drive housing from each other in axial direction of the rotor shaft;
• arranging an intermediate chamber between the rotor housing and the drive housing;
• defining a first connecting opening from the intermediate chamber to the rotor housing around the rotor shaft, and a second connecting opening from the intermediate chamber to the drive housing around the rotor shaft;
• impinging the intermediate chamber with negative pressure when the spinning operation is interrupted and the rotor housing is opened such that an air current is prevented from entering the drive;
• and
• wherein the intermediate chamber is impinged with spinning negative pressure (pSU) through the negative pressure channel of the open-end spinning device or through an own negative pressure channel.