Disclosed is a compact vacuum pump including a housing having an internal vacuum chamber, an ejector pump axially mounted in the vacuum chamber, and an air filter coaxially mounted on the ejector pump. The housing has two separate compressed air supply lines one of which is a vacuum creation line extending to the inlet port of the ejector pump via a first supply line and the other of which is a vacuum release line extending to a gap between the ejector pump and the air filter via a second supply line. The vacuum pump is of a coaxial arrangement type and has a vacuum release function and a filter cleaning function.

An ejector includes a nozzle, a suction chamber, and a diffuser. A diffuser further includes an attachment configured to change the dimensions of the outlet flow path. The attachment changes the length X of a narrowed flow path and the length Y and the inner diameter D of a parallel flow path such that expressions (1) and (2) are satisfied:
X=A×D  (1),
and
Y=B×D  (2).

An ejector includes a nozzle, a suction chamber, and a diffuser. A diffuser further includes an attachment configured to change the dimensions of the outlet flow path. The attachment changes the length X of a narrowed flow path and the length Y and the inner diameter D of a parallel flow path such that expressions (1) and (2) are satisfied:
X=A×D  (1),
and
Y=B×D  (2).

Systems repair jet pump elbow joining structures like RS1 and RS2 welds. Systems include a base having legs that secure to ends of the elbow in different directions, and a drive plate that joins to flow conduits where they meet the elbow. The drive plate and base may then be pushed together, resulting in compression or joining of the elbow and flow conduit. Multiple drive plates may be used with a single base to compress multiple flow conduits to the base. The base and the drive plates can be driven together with a driving bolt extending through the base and driving plate. To provide a better fit, grooves can be created in the flow conduits through machining from the installed base. The drive plate may be seated into the groove to achieve a desired orientation with less slippage. Example embodiments and methods do not require welding or a welding base.

Systems repair jet pump elbow joining structures like RS1 and RS2 welds. Systems include a base having legs that secure to ends of the elbow in different directions, and a drive plate that joins to flow conduits where they meet the elbow. The drive plate and base may then be pushed together, resulting in compression or joining of the elbow and flow conduit. Multiple drive plates may be used with a single base to compress multiple flow conduits to the base. The base and the drive plates can be driven together with a driving bolt extending through the base and driving plate. To provide a better fit, grooves can be created in the flow conduits through machining from the installed base. The drive plate may be seated into the groove to achieve a desired orientation with less slippage. Example embodiments and methods do not require welding or a welding base.

A vertical lighting vaneless inverter fan comprises a body, a blast system, an air supply column, a lighting device and a sound-reducing structure. The blast system is mounted in the inner chamber of body. The air supply column is installed on the top of body. The blast system supplies air to the air supply column, the airflow is jetted from the air supply column. The impeller is located above the motor. When the blast system is installed in the inner chamber of body case, the impeller corresponds to the bottom of air outlet, so that the wind can be delivered through the air outlet directly.

A blower may include a lower case having a suction port and a fan and an upper case having at least one main discharge port and at least one auxiliary discharge port. The auxiliary discharge port may be positioned in front of and below the main discharge port to discharge air introduced through the suction port upward. A door may open and/or close the auxiliary discharge port, and a door motor may power the door. The upper case may be formed as two towers defining a blowing space therebetween, and the at least one auxiliary discharge port may include a plurality of auxiliary discharge ports formed in inner walls of the two towers to face each other.

A blower is provided that may include a fan that creates airflow; a lower body forming an inner space in which the fan may be installed, and having at least one suction hole through which air passes; an upper body positioned above the lower body and including a first upper body forming a first inner space that communicates with the inner space of the lower body, and a second upper body forming a second inner space that communicates with the inner space of the lower body and spaced apart from the first upper body; a space formed between the first upper body and the second upper body and opened in a frontward-rearward direction; a first opening formed through a first boundary surface of the first upper body facing the space; a second opening formed through a second boundary surface of the second upper body facing the space; and a door assembly including a first door installed at the first upper body and that opens and closes the first opening, and a second door installed at the second upper body and that opens and closes the second opening.

A blower is provided that may include a fan that creates airflow; a lower body forming a lower space therein in which the fan may be disposed, and having at least one suction hole through which air passes; a first upper body positioned above the lower body, and forming a first inner space that communicates with the lower space of the lower body; a second upper body positioned above the lower body, and forming a second inner space that communicates with the lower space of the lower body, the second upper body being spaced apart from the first upper body; and a space formed between the first upper body and the second upper body, and opened in a frontward-rearward direction. The first upper body may include a first slit formed through the first upper body such that air in the first inner space may be discharged into the space, and the second upper body may include a second slit formed through the second upper body such that air in the second inner space may be discharged into the space.

A jet pump assembly for facilitating a jet pump to be dissembled and serviced in the field includes a jet pump that is fluidly coupled to a fluid pump for pumping a fluid into a petroleum well at a given pressure. The jet pump includes a nozzle housing, a mixing tube, a diffuser, a crossover body and an outer sleeve. The diffuser threadably engages the crossover body, the outer sleeve threadably engages each of the nozzle housing and the crossover body for assembling the jet pump. In this way the jet pump can be dissembled and serviced, in the field, without special tools or training.