This invention discloses a portable self-priming pump, which includes a pump body, a pump cover, a rubber impeller with a metal insert, and a metal shaft. An inner cavity formed by the pump body, in the side wall of the pump body provided with a water inlet and a water outlet which are communicated with the inner cavity, the water inlet and the water outlet are in the same plane and the angle formed by their axes is 20-160, the inner cavity is designed with a cam-shaped structure and the rubber impeller with a metal insert is placed in the inner cavity. The whole structure of the portable self-priming pump is simplified, so it's convenient for installation, manufacture and disassembly and maintenance, and it is with a small sized volume which occupies small space and is suitable for operation in narrow space, and it has high practicality accordingly.

A centrifugal pump assembly, with electric motor arranged in a casing, includes at one end, a wet section, formed by a volute and containing an impeller, and, at the other end, a box, which contains an electrical board, in contact with one end of the casing. The electric motor is of the permanent-magnet brushless type and the casing is made of stainless steel.

An impeller pump has a pump chamber with an inlet and an outlet, and an impeller in the pump chamber. An auxiliary outlet out of the pump chamber together with an auxiliary outlet flap is provided, the auxiliary outlet flap having a closed position and at least one open position and being rotatable or movable between the positions. In the closed position, the auxiliary outlet flap closes off the auxiliary outlet and, in each of the open positions, the auxiliary outlet flap at least partially opens the auxiliary outlet. The auxiliary outlet flap has an actuator and is subjected to force loading by the actuator, such that the auxiliary outlet flap is moved automatically from the closed position into one of the open positions if the auxiliary outlet flap is free from fluid flow in a direction of rotation of the impeller.

A pump module includes a main body, a first pump and a second pump. The main body includes a fluid channel, a first mounting hole and a second mounting hole. The fluid channel is exposed through the first mounting hole and the second mounting hole. The first pump is installed in the first mounting hole and sealedly coupled with the first mounting hole. The second pump is installed in the second mounting hole and sealedly coupled with the second mounting hole. A working liquid in the fluid channel is transferred through the first pump and the second pump sequentially. Even if one of the first pump and the second pump is damaged, the other of the first pump and the second pump is normally operated to move the working liquid in the fluid channel.

The invention discloses an anti-blocking ultra-low water level land submersible amphibious pump, which comprises an outer shell body, a motor, a water tank, a motor housing, a flowing guiding disc, a cover plate, a flow guiding chamber, an impeller, a suction nozzle and a base. The motor and the water tank are provided in the outer shell body. The motor is disposed in the motor housing. A half of the motor housing is accommodated in the water tank. In the aforementioned manner, the present invention provides an anti-blocking type ultra-low water level land submersible amphibious pump, which has both functions of a ground pump and a submersible pump, realizes the amphibious function, has the advantages of convenient and flexible movement, and better expands the adaptability range of the pump.

A method for optimizing the blade axis position of a water pump under all operating conditions which includes determination of multiple calculation conditions within the range of all the operating conditions of the water pump, three-dimensional modeling and mesh generation of the calculation area of the flow field of the water pump at multiple blade angles, numerical simulation of the flow field and calculation and determination of blade hydraulic torques under multiple conditions, determination of the range of the position of the blade resultant hydraulic pressure action line and an optimal blade axis position under all the operating conditions, determination of the small region of the optimal blade axis position under all the operating conditions, determination of the optimal blade axis position, and comparison of the blade hydraulic torques before and after optimization of the blade axis position.

A fluid pump including an integrated pumping section and motor section may be achieved by a variety of techniques. In certain aspects, a fluid pump may include an integrated pumping section, motor section, and a control section that share structural components in order to reduce the structural material required for the complete device while simultaneously utilizing the integrated motor controller to enable the pump to operate at varying speeds other than the synchronous electrical power frequency that powers the device.

A technical object of the present invention is to provide an annular injection apparatus for wet compression which enables sprayed droplets to maximally evaporate without being drained as condensate water, thereby reducing compression work of the compressor. To this end, the annular injection apparatus for wet compression according to the present invention is an annular injection apparatus for wet compression which is used for a compressor including a nose cone and a bell mouth in an inlet of a flow path, in which droplets are sprayed to a portion except for portions directed toward the nose cone and the bell mouth.

An example water well submersible pump filter may comprise: (1) a perforated cap; (2) a perforated hollow cylindrical middle member joined to the perforated cap at a first end of the perforated hollow cylindrical middle member; and (3) a filter crown comprising: (a) a hollow cylindrical crown segment joined to the second end of the perforated hollow cylindrical middle member at a first end of the hollow cylindrical crown segment, (b) a hollow conical crown segment joined to a second end of the hollow cylindrical crown segment at a first end of the hollow conical crown segment, and (c) a ring of fins joined to, and extending longitudinally from, a second end of the hollow conical crown segment. The second end of the hollow conical crown segment may join to proximal ends of fins of the ring of fins.

An aeration pump system includes a tee fitting, an inlet pipe, an outlet pipe, and a pump assembly. The tee fitting includes a main body and a 90-degree curve channel traversing through the main body. The pump assembly includes a motor, a shaft, at least one peller, and a first-shaft stabilizer. The inlet and outlet pipes perpendicularly connect to the main body and are in fluid communication with each other through the 90-degree curve channel. The motor adjacently mounts to the main body and is diametrically opposed to the inlet pipe. The shaft operatively couples to the motor, which transfers rotational energy to the shaft. The first-shaft stabilizer terminally connects to the inlet pipe, opposite the main body. The at least one peller connects around the shaft and is positioned within the inlet pipe.