The invention relates to an ejector arrangement (1, 40) comprising a housing (11) and at least two ejectors (2, 3, 41, 42) arranged in said housing (11) along a common axis (13). Each ejector (2, 3, 41, 42) has a motive inlet (4, 5), a suction inlet (6, 7), an outlet (8, 9) and a valve element (23, 24, 43, 44). The task of the invention is to provide an ejector arrangement that allows for a good control of the mass flow of fluid through the ejector arrangement while keeping the construction simple. According to the invention the above task is solved in that the ejector arrangement (1, 40) comprises a common actuator (25, 55), that is arranged to engage at least two of the valve elements (23, 24, 43, 44) to open the motive inlets (4, 5).

The invention relates to an ejector arrangement (1, 40) comprising a housing (11) and at least two ejectors (2, 3, 41, 42) arranged in said housing (11) along a common axis (13). Each ejector (2, 3, 41, 42) has a motive inlet (4, 5), a suction inlet (6, 7), an outlet (8, 9) and a valve element (23, 24, 43, 44). The task of the invention is to provide an ejector arrangement that allows for a good control of the mass flow of fluid through the ejector arrangement while keeping the construction simple. According to the invention the above task is solved in that the ejector arrangement (1, 40) comprises a common actuator (25, 55), that is arranged to engage at least two of the valve elements (23, 24, 43, 44) to open the motive inlets (4, 5).

A jet pump of a downhole tool in a wellbore, wherein the jet pump has a nozzle in fluid communication with a throat and wherein the throat is further in fluid communication with a diffuser, the jet pump further having a central channel located towards an uphole end of the downhole tool, wherein the central channel is configured to house a volume of power fluid; a first annular channel defined in the downhole tool, wherein the first annular channel is arranged around the nozzle and in fluid communication with the central channel; a volume of production fluid located towards a downhole end of the downhole tool; a second annular channel defined in the downhole tool configured to house the volume of production fluid; and a reverse channel in fluid connection with the second annular channel, wherein the reverse channel is in fluid communication with the nozzle.

A jet pump of a downhole tool in a wellbore, wherein the jet pump has a nozzle in fluid communication with a throat and wherein the throat is further in fluid communication with a diffuser, the jet pump further having a central channel located towards an uphole end of the downhole tool, wherein the central channel is configured to house a volume of power fluid; a first annular channel defined in the downhole tool, wherein the first annular channel is arranged around the nozzle and in fluid communication with the central channel; a volume of production fluid located towards a downhole end of the downhole tool; a second annular channel defined in the downhole tool configured to house the volume of production fluid; and a reverse channel in fluid connection with the second annular channel, wherein the reverse channel is in fluid communication with the nozzle.

An ejector and a refrigeration system. The ejector includes: a high-pressure fluid passage, a flow valve for controlling a flow rate in the high-pressure fluid passage; a suction fluid passage; a mixing chamber, which includes a mixed fluid outlet; a thermal bulb disposed upstream of the flow valve, in the high-pressure fluid passage or outside the high-pressure fluid passage; and an elastic diaphragm disposed in the high-pressure fluid passage, wherein a closed cavity is on a first side of the diaphragm, and the high-pressure fluid passage is on a second side of the diaphragm; the thermal bulb in communication with the closed cavity, and the thermal bulb and the closed cavity are filled with fluid; and the diaphragm is associated with the flow valve so that an opening degree of the flow valve varies in response to a change in a pressure difference across two sides of the diaphragm.

An ejector and a refrigeration system. The ejector includes: a high-pressure fluid passage extending from a high-pressure fluid inlet to a mixing chamber; a suction fluid passage extending from a suction fluid inlet to the mixing chamber, a first valve being disposed in the suction fluid passage; the mixing chamber, which includes a mixed fluid outlet; and a thermal bulb arranged in the suction fluid passage downstream of the first valve; wherein an elastic diaphragm is disposed in the suction fluid passage, the suction fluid passage is on a first side of the elastic diaphragm, and a closed cavity is on a second side of the elastic diaphragm; the thermal bulb is in communication with the closed cavity, and the thermal bulb and the closed cavity are filled with fluid.

A multistage ejector is provided for generating a vacuum from a source of compressed air. The compressed air is passed through a series of nozzles, which entrains air so as to form a jet flow in two or more stages and generating a vacuum across each stage. The ejector outlet is formed as a nozzle extending to the outlet end of the ejector and arranged to receive the jet flow from the final stage of the ejector. The ejector outlet nozzle includes a diverging section extending at an angle of divergence to the direction of airflow, the diverging section terminating in a stepwise expansion in the cross-sectional flow area, as viewed in a direction perpendicular to the direction of airflow through the ejector outlet nozzle.

A multistage ejector is provided for generating a vacuum from a source of compressed air. The compressed air is passed through a series of nozzles, which entrains air so as to form a jet flow in two or more stages and generating a vacuum across each stage. The ejector outlet is formed as a nozzle extending to the outlet end of the ejector and arranged to receive the jet flow from the final stage of the ejector. The ejector outlet nozzle includes a diverging section extending at an angle of divergence to the direction of airflow, the diverging section terminating in a stepwise expansion in the cross-sectional flow area, as viewed in a direction perpendicular to the direction of airflow through the ejector outlet nozzle.

A multi-stage ejector for generating a vacuum from a source of compressed air or fluid by passing the compressed air or fluid through a series of nozzles, accelerating and entraining the compressed air or fluid so as to form a jet flow in one or more stages and generate a vacuum across each stage. The multi-stage ejector may include a first drive stage; a second stage; and a converging-diverging nozzle provided in the series of nozzles between the first drive stage and the second stage. The multi-stage ejector, in use, may receive jet flow from the first drive stage, accelerate the jet flow to form a second stage air jet and direct the second stage air jet into an inlet of an outlet nozzle of the second stage. The converging-diverging nozzle may be formed in a molded nozzle piece mounted in the multi-stage ejector.

A multi-stage ejector for generating a vacuum from a source of compressed air or fluid by passing the compressed air or fluid through a series of nozzles, accelerating and entraining the compressed air or fluid so as to form a jet flow in one or more stages and generate a vacuum across each stage. The multi-stage ejector may include a first drive stage; a second stage; and a converging-diverging nozzle provided in the series of nozzles between the first drive stage and the second stage. The multi-stage ejector, in use, may receive jet flow from the first drive stage, accelerate the jet flow to form a second stage air jet and direct the second stage air jet into an inlet of an outlet nozzle of the second stage. The converging-diverging nozzle may be formed in a molded nozzle piece mounted in the multi-stage ejector.