Pump unit bell-shaped inlet channel with movable flow plate

Abstract

The invention relates to a bell-shaped water inlet channel of a pump device with a movable flow-adjusting plate, which belongs to the technical field of water conservancy engineering. It includes a pier placed in the water inlet channel, a semicircular rear wall, a trumpet pipe and a water guide cone, and is equipped with a movable flow-adjusting plate and a positioning pin. The flow-adjusting plate can make changes to adapt to asymmetric flow by using the pressure difference. The movable flow fitting plate is located at the rear wall of the water inlet channel and there is a gap between it and the rear wall; the section where the flow fitting plate is located is perpendicular to the bottom surface of the flow channel, and the two ends of the connecting shaft are respectively fixed on the bottom of the bell-shaped water inlet channel and the horn On the outer wall of the tube, one end of the flow adapting plate is connected to the connecting shaft through a sleeve, and can rotate around the connecting shaft; there are two positioning pins, which are respectively placed on both sides of the flowing plate and fixed at the bottom of the bell-shaped water inlet channel. The distances to the coupling shafts are all less than the length of the flow plate. The invention is suitable for bell-shaped water inlet channels and box-shaped water inlet channels, can adapt to various operating conditions, improves pump device efficiency, reduces operating costs, and is more energy-saving and efficient.

Description

technical field [0001] The invention relates to a bell-shaped water inlet channel of a pump device with a movable flow-adjusting plate, which belongs to the technical field of water conservancy engineering. Background technique [0002] The bell-shaped water inlet channel is a relatively good form of water inlet channel, and it is widely used in vertical axial flow pump devices. The water flow movement of the bell-shaped water inlet channel undergoes horizontal contraction, adjustment from the suction chamber to the horn tube, that is, acceleration and turning, and the flow velocity at the outlet section of the water inlet channel is relatively uniform. However, compared with the elbow-shaped inlet channel, the uniformity of the outlet section of the bell-shaped inlet channel is worse. [0003] For a large axial flow pump device, a septum pier is provided in the water inlet channel. Experimental research shows that the water flow on both sides of the pier in the inlet chan...

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Problems solved by technology

This leads to a decline in the uniformity of flow velocity distribution at the outlet section.

[0004] However, in actual projects, the flow rates on the left and right sides of the pier in the inlet channel of large pumping stations are often unequal, and the water flow confluence area is not in the center of the channel, so the asymmetric inflow convection should be fully considered in the optimization design process of the bell-shaped inlet channel. Influenced by the channel flow state, if the design is not proper, the performance of the pump device will be drastically deteriorated

[0005] Usually, a baffle that acts as a guide is set up in the middle of the back wall of the water inlet channel to improve the flow state. The direction of the baffle is generally consistent with the centerline of the flow channel. This solution has a significant effect of vortex elimination only in the case of symmetrical inflow, but Fixed partitions cannot achieve dynamic balance of water flow distribution under different operating conditions

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