CN106499669A - Water pump using flexible stator - Google Patents

Abstract

A water pump using flexible guide vanes belongs to the technical field of water conservancy engineering. It includes a cone outside the guide vane, a water pump blade, and a guide vane. It is characterized in that the guide vane is a flexible guide vane. The outlet of the rigid section of the vane is in the same direction as the pump shaft; the outlet side of the flexible section of the guide vane is connected to the inlet side of the rigid section of the guide vane, and the inlet side of the flexible section of the guide vane is connected to a coupling shaft, and the two ends of the coupling shaft are respectively connected to the The hub of the guide vane body and the side wall of the cone outside the guide vane body are fixed. The invention is applicable to various axial flow pumps and guide vane mixed flow pumps, can adapt to pumping station projects with large fluctuations in operating conditions, significantly improves the overall performance of the pump device in non-design working conditions, and greatly expands the axial flow pump and guide vane mixed flow Wide range of pumps, less operating costs, more energy efficient.

Description

Water pumps with flexible guide vanes

technical field

The invention relates to a water pump using flexible guide vanes, which belongs to the technical field of water conservancy engineering, in particular to the technical fields of hydraulic machinery, fluid machinery and hydraulics.

Background technique

Axial flow pumps and vane mixed flow pumps are equipped with guide vanes behind the runners. The guide vane plays an important role in rectification and energy recovery for the huge circulation at the outlet of the pump runner. The effectiveness of a guide vane depends on its hydraulic loss, which is directly related to the flow angle at the inlet. Usually the guide vane of the pump is fixed, but the operating conditions of the pump are changed. When the operating condition changes and deviates from the optimal condition, the flow velocity direction at the outlet of the runner changes accordingly, which causes the liquid flow angle at the inlet of the guide vane to change, resulting in the detachment of the inlet water flow, increased hydraulic loss, and reduced pump efficiency. This is the main reason why the high efficiency range of the axial flow pump is narrow. Therefore, the impellers of large axial flow pumps and mixed flow pumps are often made into a structure in which the blades can be rotated to adjust the angle to adapt to changes in working conditions and improve efficiency. Therefore, it increases the manufacturing cost greatly and can only be used for large pumps.

Contents of the invention

The object of the present invention is to provide a water pump using flexible guide vanes to address the above-mentioned deficiencies in the prior art. The invention is a guide vane used for recovering fluid rotational kinetic energy at the rear side of the impeller outlet of an axial flow pump and a mixed flow pump, and the guide vane is different from the existing guide vane.

The object of the present invention is achieved through the following technical solutions: the water pump adopting flexible guide vanes, including guide vane external cone pipe, water pump blades, guide vanes, is characterized in that, described guide vanes are flexible guide vanes, and the flexible guide vanes are composed of The upper part is composed of a fixed rigid section and a lower deformable flexible section. The outlet of the guide vane rigid section is in the same direction as the pump axis; the outlet side of the guide vane flexible section is connected to the inlet side of the guide vane rigid section. The inlet side of the flexible section of the leaf is connected with a coupling shaft, and the two ends of the coupling shaft are respectively fixed to the hub of the guide vane body and the side wall of the tapered tube outside the guide vane body.

The flexible section of the guide vane is made of high-strength film-like soft material or chain belt-type rigid material.

The axial length of the rigid section of the guide vane is (0.15-0.26)D, the axial length of the flexible section of the guide vane is (0.3-0.45)D, and D is the diameter of the impeller.

The outlet side of the flexible section of the guide vane is connected with the inlet side of the rigid section of the guide vane by a buckle to facilitate the rotation of the flexible guide vane.

The connecting shaft is cylindrical with a diameter of 0.01D, where D is the diameter of the impeller; the connecting shaft is respectively fixed to the hub of the guide vane body and the side wall of the cone outside the guide vane by welding or threaded connection.

The invention is used for the design and manufacture of the pump sections of axial flow pumps and mixed flow pumps. The pump sections of axial flow pumps and mixed flow pumps are composed of impellers, guide vanes and curved pipes. The inlet edge of the flexible section of guide vanes can automatically follow the incoming flow around the coupling shaft Rotate to adapt to different direction angles of the incoming flow, so that the impact loss of the water flow is minimized.

When the working conditions of the axial flow pump and the guide vane mixed flow pump change, the outflow angle of the fluid at the outlet of the impeller changes accordingly. Usually the guide vane is fixed, so the fluid that has changed the flow direction no longer matches it when it flows into the guide vane, making the guide vane inflow angle too large or too small, resulting in increased inlet impact loss and reduced pump efficiency. The inlet edge of the guide vane of the invention can follow the incoming flow and rotate around the coupling shaft, and automatically adapt to the change of the incoming flow direction angle, so that the fluid energy loss is minimized.

The invention is applicable to various axial flow pumps and guide vane mixed flow pumps, can adapt to pumping station projects with large fluctuations in operating conditions, significantly improves the overall performance of the pump device in non-design working conditions, and greatly expands the axial flow pump and guide vane mixed flow Wide range of pumps, less operating costs, more energy efficient.

Axial flow pumps and mixed flow pumps have huge markets both at home and abroad. In my country, 30,000 to 40,000 axial flow pumps are used every year. There are a large number of construction and renovation of pumping stations for inter-basin water diversion, water supply projects and drainage and irrigation projects. The invention is beneficial to greatly broaden the high-efficiency area of various low-lift pumping stations, adapt to the operation of different working conditions, has reliable technology, is easy to implement, reduces energy consumption, improves efficiency, has broad application prospects, and huge economic and social benefits.

Description of drawings

Fig. 1 is a three-dimensional wireframe diagram of the present invention;

Fig. 2 is the schematic diagram when the liquid flow velocity of the present invention decreases;

Fig. 3 is the schematic diagram when the liquid flow velocity of the present invention increases;

Fig. 4 is a three-dimensional perspective view of the present invention;

In the figure: 1 flexible guide vane, 2 guide vane outer conical tube, 3 guide vane body hub, 4 water pump blade, 5 impeller chamber, 6 impeller hub, 7 guide vane flexible section, 8 guide vane fixed section, 9 guide vane inlet connection Shaft, 10-ring buckle.

detailed description

The invention is suitable for low-lift axial flow pumps and mixed flow pumps, and the drawings are designed according to the design requirements.

A water pump using a flexible guide vane includes a cone outside the guide vane 2 , water pump blades 4 , and a flexible guide vane 1 . The flexible guide vane consists of an upper fixed rigid section 8 and a lower deformable flexible section 7 .

The outlet of the rigid section 8 of the guide vane is in the same direction as the pump axis, and the outlet side of the flexible section 7 of the guide vane is connected with the inlet side of the rigid section 8 of the guide vane by a buckle 10 to facilitate the rotation of the flexible guide vane.

The inlet edge of the flexible section of the guide vane is connected with a coupling shaft 9, and the two ends of the coupling shaft are respectively fixed with the hub 3 of the guide vane body and the side wall of the cone outside the guide vane. The inlet side of the flexible section of the guide vane can automatically follow the incoming flow and rotate around the coupling axis, adapting to different direction angles of the incoming flow, so as to minimize the impact loss of the water flow.

The flexible section 7 of the guide vane can be made of a high-strength, durable membrane material, or a rigid material of the chain belt type, and its section should ensure that it meets the design requirements of the guide vane. The axial length of the rigid section of the guide vane is 0.15D-0.26D, the axial length of the flexible section of the guide vane is 0.3D-0.45D, and D is the diameter of the impeller.

The connecting shaft is cylindrical, with a diameter of 0.01D, where D is the diameter of the impeller; the connecting shaft is respectively fixed to the hub of the guide vane body and the side wall of the cone outside the guide vane by welding or threaded connection.

The pump impeller is manufactured according to the routine, and the gap between the outlet of the pump impeller and the inlet edge of the guide vane is 0.01D larger than the conventional value (D is the diameter of the impeller). According to the relevant standards, do a good job in the processing of the fixed section of the guide vane, the installation of the guide vane hub and the bearing, and the rigidity of the fixed section should ensure the support of the pump bearing.

Claims (5)

1. A water pump using a flexible guide vane, comprising a cone outside the guide vane (2), water pump blades (4), and a guide vane, characterized in that the guide vane is a flexible guide vane (1), and the flexible guide vane It consists of an upper fixed rigid section (8) and a lower deformable flexible section (7). The outlet of the guide vane rigid section (8) is in the same direction as the pump axis; the guide vane flexible section (7) The outlet side is connected with the inlet side of the guide vane rigid section (8), and the inlet side of the guide vane flexible section is connected with a coupling shaft (9). The tube sidewall is fixed. 2. The water pump using flexible guide vanes according to claim 1, characterized in that the flexible section (7) of the guide vanes is made of high-strength film-like soft materials or chain-belt-type rigid materials. 3. The water pump employing flexible guide vanes according to claim 1, wherein the axial length of the rigid section of the guide vane is (0.15-0.26)D, and the axial length of the flexible section of the guide vane is (0.3-0.26)D. 0.45) D, D is the impeller diameter. 4. The water pump using flexible guide vanes according to claim 1, characterized in that the outlet side of the flexible guide vane section and the inlet side of the guide vane rigid section are connected by a ring buckle (10) to facilitate the flexible guide vane rotation. 5. The water pump using flexible guide vanes according to claim 1, wherein the coupling shaft is cylindrical, with a diameter of 0.01D, where D is the diameter of the impeller; the coupling shaft is welded or screwed to the guide vane body respectively The hub and guide vane are fixed on the side wall of the tapered tube outside the body.