Disclosed is a self-priming fluid transfer system having an integral siphon line that draws trapped air bubbles out of a main fluid chamber over time and fluid cycles. The self-priming fluid transfer system may include a body structure and a siphon line. The body structure may include a chamber inlet and a chamber outlet. The main fluid chamber may receive and output fluid from the chamber inlet and the chamber outlet, respectively. The siphon line may be positioned at the periphery of the main fluid chamber and may include a priming inlet and a siphon outlet. The priming inlet may be positioned at or near a top wall of the body structure and may receive air bubbles from the main fluid chamber. The siphon outlet may be positioned at the chamber outlet and may output the air bubbles at the chamber outlet. Other examples may be described and claimed.

A quick no-water startup apparatus for a centrifugal pump includes, from top to bottom in sequence, one-way passages (1), a self-priming chamber housing (41), sliding devices (5), a self-priming chamber (4), chamber partition plates (2) a concave-convex impeller (3), inlet channels (6) connected on two sides of the self-priming chamber (4), a spring device (7) of an upper-side x-shaped gas-liquid separation device, the upper-side x-shaped gas-liquid separation device (8), upper and middle-side gas-liquid separation device connecting shafts (9), a middle-side gas-liquid separation device (10), lower-side backflow-type gas-liquid separation devices (11), v-shaped backflow channels (122), an inverted v-shaped inlet channel (121), and an inlet. The quick no-water startup apparatus of the present invention enables the centrifugal pump to directly enter a normal operating condition after no-water startup, and 36 times of air exhaust can be completed while the concave-convex impeller (3) in the self-priming chamber (4) rotates by a circle in the early stage. Besides, the apparatus is provided with the upper, middle, and lower gas-liquid separation devices to fully realize separation of gas and liquid, so that gas can be exhausted more quickly and the chamber is filled with water. Therefore, the working efficiency is significantly improved and the operation process is greatly simplified.

A quick no-water startup apparatus for a centrifugal pump includes, from top to bottom in sequence, one-way passages (1), a self-priming chamber housing (41), sliding devices (5), a self-priming chamber (4), chamber partition plates (2) a concave-convex impeller (3), inlet channels (6) connected on two sides of the self-priming chamber (4), a spring device (7) of an upper-side x-shaped gas-liquid separation device, the upper-side x-shaped gas-liquid separation device (8), upper and middle-side gas-liquid separation device connecting shafts (9), a middle-side gas-liquid separation device (10), lower-side backflow-type gas-liquid separation devices (11), v-shaped backflow channels (122), an inverted v-shaped inlet channel (121), and an inlet. The quick no-water startup apparatus of the present invention enables the centrifugal pump to directly enter a normal operating condition after no-water startup, and 36 times of air exhaust can be completed while the concave-convex impeller (3) in the self-priming chamber (4) rotates by a circle in the early stage. Besides, the apparatus is provided with the upper, middle, and lower gas-liquid separation devices to fully realize separation of gas and liquid, so that gas can be exhausted more quickly and the chamber is filled with water. Therefore, the working efficiency is significantly improved and the operation process is greatly simplified.

A self-priming, centrifugal pump comprising a first housing part having a front wall with an inlet, a second housing part having an outlet, an impeller rotatably arranged in the second housing part and a pump screw rotatably arranged in the first housing part, connected to the impeller and comprising a center body around which a helical blade is arranged for feeding the impeller with any gas that is present in the liquid, wherein the center body is arranged at a distance from a side of the front wall that faces the center body, such that a channel with a width of at least 12 mm is formed between the center body and the side of the front wall that faces the center body.

A self-priming, centrifugal pump comprising a first housing part having a front wall with an inlet, a second housing part having an outlet, an impeller rotatably arranged in the second housing part and a pump screw rotatably arranged in the first housing part, connected to the impeller and comprising a center body around which a helical blade is arranged for feeding the impeller with any gas that is present in the liquid, wherein the center body is arranged at a distance from a side of the front wall that faces the center body, such that a channel with a width of at least 12 mm is formed between the center body and the side of the front wall that faces the center body.

A self-priming, centrifugal pump comprising a first housing part having a front wall with an inlet, a second housing part having an outlet, an impeller rotatably arranged in the second housing part and a pump screw rotatably arranged in the first housing part, connected to the impeller and comprising a center body around which a helical blade is arranged for feeding the impeller with any gas that is present in the liquid, wherein the center body is arranged at a distance from a side of the front wall that faces the center body, such that a channel with a width of at least 12 mm is formed between the center body and the side of the front wall that faces the center body.

A self-priming, centrifugal pump comprising a first housing part having a front wall with an inlet, a second housing part having an outlet, an impeller rotatably arranged in the second housing part and a pump screw rotatably arranged in the first housing part, connected to the impeller and comprising a center body around which a helical blade is arranged for feeding the impeller with any gas that is present in the liquid, wherein the center body is arranged at a distance from a side of the front wall that faces the center body, such that a channel with a width of at least 12 mm is formed between the center body and the side of the front wall that faces the center body.

A reconfigurable pump includes a housing with inlet and outlet openings. An inlet adapter is mounted on the housing and includes an inlet passage communicating with the inlet opening. The inlet adapter is removably mounted on the housing and can be removed and repositioned for reconfiguring the pump between low-inlet and high-inlet configurations. In a low-inlet configuration the inlet passage is generally aligned with an impeller rotatably mounted in the housing. A check valve comprising a flapper valve is provided in the low-inlet configuration and prevents backflow. The flapper valve is removable for configuration in a high-inlet configuration with the inlet passage located generally above the impeller level. The inlet adapter can readily be repositioned from outside the pump housing between its low-inlet and high-inlet configurations.

A reconfigurable pump includes a housing with inlet and outlet openings. An inlet adapter is mounted on the housing and includes an inlet passage communicating with the inlet opening. The inlet adapter is removably mounted on the housing and can be removed and repositioned for reconfiguring the pump between low-inlet and high-inlet configurations. In a low-inlet configuration the inlet passage is generally aligned with an impeller rotatably mounted in the housing. A check valve comprising a flapper valve is provided in the low-inlet configuration and prevents backflow. The flapper valve is removable for configuration in a high-inlet configuration with the inlet passage located generally above the impeller level. The inlet adapter can readily be repositioned from outside the pump housing between its low-inlet and high-inlet configurations.

A multi-stage, self-priming centrifugal pump assembly includes at least two pump stages (4) which are consecutive in a main flow direction (32), and a backflow channel (13) which lies parallel to at least one a pump stage (4). The backflow channel (13) runs out downstream of the first or a further pump stage (4), in the main flow direction (32).