Ejector with core needle cooled by cooling medium

An ejector comprising:

• a stepping motor installed coaxially with a cooling section, a nozzle, and a secondary flow suction chamber,
• the cooling section provided with a cooling medium inlet and a cooling medium outlet, wherein a sealing element is arranged between the cooling section and the nozzle, and the nozzle is inserted into the secondary flow suction chamber, and an end of the nozzle close to the sealing element is provided with a primary flow medium inlet,
• a core needle, arranged along a central axis of the cooling section and the nozzle, and cooled by a cooling medium, wherein the core needle passes through a central circular hole of the sealing element, and an output shaft of the stepping motor is linked with the core needle;
• the nozzle configured to be inserted into the secondary flow suction chamber,
• wherein the secondary flow suction chamber is provided with a secondary flow medium inlet at a front end of the secondary flow suction chamber, and a medium outlet is provided at an end of the diffuser of the ejector;
• wherein the sealing element is a connection sealing element arranged between the cooling section and the nozzle, and the connection sealing element comprises a first baffle with an outer periphery end fixed between the cooling section and the nozzle, an inner sealing ring connected to an inner periphery of the first baffle, wherein the inner ring is arranged around the central circular hole of the connection sealing element;
• and
• wherein the sealing element is a slidable sealing element, an inner diameter of the cooling section is equal to an inner diameter of the nozzle, the cooling section and the nozzle are fixed relative to each other;
• and the slidable sealing element is arranged within the cooling section and the nozzle, the slidable sealing element comprises a second baffle fixed to the core needle and an outer sealing ring arranged within a concave cavity in an outer wall of the slidable sealing element.