The design requirements of the vane pump are gradually clear with the development of science and technology and engineering technology, naturally it is also proposed based on the current status of the use of vane pumps. Two issues are discussed below.

First, the use and selection of vane pumps

Vane pumps, or more broadly speaking, mechanical products, the correct selection of the type is the first step in design. They are based on some basic information, especially some general standards established in various countries and even internationally in recent years, such as performance, manufacturing Technical requirements, as well as operation, maintenance and after-sales service requirements, select the product type, specifications, performance, and installation dimensions. Its products can be divided into two categories: one is the general standard size, form and performance; the other is non-standard products under special conditions. Both products will have
Different design requirements.

The first type of product should be adapted to a wide range of performances such as flow and head with minimal component types and size differences. Especially the vulnerable main parts, such as the impeller, pump casing, shaft, bearing and shaft seal, should be interchangeable. At the same time, changing the number of stages and materials can form multiple combinations to meet a wider range of needs. The type and performance specifications of the product should fully meet the requirements of the application. For small size and low power vane pumps, the range of use of each specification should be expanded, the structure and variety should be simplified, and a few percent efficiency reduction in use should be allowed, thereby reducing product costs and improving the general level of the process and the use of reliability. Low-power water pumps or miniature water pumps have negligible operating costs due to increased power consumption, and their price investment plays a decisive role. Especially like small submersible electric pumps used as accident drainage, they are not often operated, efficiency should not be the main consideration, reliability is the most important. In the past few years, the only index for energy-saving water pumps organized in China was efficiency, and only the efficiency of the design point was evaluated. The same standard was adopted regardless of the size and type of the water pump. This does not necessarily conform to market principles and production principles. Theoretically, the step size of the larger power units can be smaller to ensure higher operating efficiency; while the step size of the smaller units can be larger, the efficiency requirements should also be wider.

Also in the strength design, small pumps can be considered to allow application to several times the rated speed. It is not necessarily an economic solution to design the pump casing, pump shaft and bearing system only according to low speed and low pressure, or only high speed and high pressure. But for large units, the same hydraulic model must be designed for high-speed high-pressure and low-speed low-pressure products.

For vane pumps with special or special requirements, other requirements in use should be considered as far as possible. In order to obtain the performance (but not necessarily the highest efficiency) and the most economical design, comprehensive consideration should be given to the type, specific speed (sometimes speed), stages, head coefficients and flow coefficients, strength and structure of parts, and materials. And economics and reliability are equally important.

Some users in China have some one-sided views. They only pursue superficial "energy-saving" indicators. Even for temporary work or intermittent work, they also choose the same model, and choose complex, expensive and high-power models. Increased investment and total operating costs. The number of pump parts also has an impact on the design of the vane pump. The use of common parts and standard parts can not only reduce product costs, improve quality, but also improve the accuracy of dimensions, which can effectively guarantee the performance of vane pumps.

When determining the type and specifications of a product, the production plant first considers market needs. Sometimes the products required by the market are not produced by the production plant. At this time, in order to meet certain needs, a small number of parts may be modified. However, for the sake of saving trouble, especially when it can not be proved that these modifications can better meet the needs of the market, barely modify the existing products to "make up". Because if the quality of the product is poor, it will harm the reputation of the manufacturer and even run into accidents. Some low specific speed vane pumps in China adopt a design method of increasing the specific speed. Although the efficiency of the "design point" (not the highest efficiency point) is improved, these pumps are likely to cause unstable performance when used at low flow rates. Even vibrations and stalls cause accidents. Therefore, to determine the type and specifications of the product, when performing hydraulic design, not only the performance at the design point must be met, but also the performance when it deviates from the design conditions.

Improving the stability of the performance of the vane pump under the design conditions will improve the reliability of the operation of the vane pump. Some foreign pump manufacturing companies regard stable performance curves as an important condition for performance-price ratio. For pumps with the same efficiency, flow rate and lift, if the product has a stable performance curve, its sales price may be much more expensive, or even double, especially when the pump is required to operate in the full flow area in the process system. In important circulating systems, failure is almost the key to operating costs, such as boiler feed pumps, condensing pumps for nuclear power plants, circulating pumps for nuclear reactors, and circulating pumps for air conditioning units in large buildings. It doesn't seem to be the main equipment in principle, but if there is no standby unit, the failure of these pumps will bring the entire system to a standstill and may even cause a disaster. Similarly, mine drainage pumps are required to be able to be put into operation at any time. Although there are standby units, or even double standby units, the failure should be reduced to the lowest possible level. In all these cases, compromises in performance and component quality are the wrong choices.


Zhejiang Yongling Hydraulic Machine Co., Ltd . specializes in manufacturing and supplying high-quality Vane Pumps in China. It has its own metallographic and physical chemistry laboratory and advanced and complete testing equipment to ensure product quality. Our products occupy most of the domestic market and are exported to Southeast Asia, Russia, Africa and other foreign markets. Click on our website for more information on vane pump products, welcome to buy and consult: https://www.china-vanepump.com