This article is the pump test device design experience summary, describes in detail the various components of the test device: power source, transmission system and measurement and control system and other design elements for the pump industry peers, especially for the pump test bench comrades, There will be some help. Keywords fire pump gearbox inspection device diesel engine 1. Introduction As an industrial product, pumps have been used more and more widely in conveying media and power source. There are more and more marine pumps, fire pumps, sewage pumps and submersible pumps suitable for all kinds of special occasions. Some special pumps, such as fire pumps, the rapid development of increasingly high pressure, high flow direction, the original single pressure pump also appeared in the low pressure, high pressure or high pressure pump development trend, some of the original test The device has become incompatible, therefore, in order to pump product quality can be effectively controlled and improved, the design and construction of some new testing device is particularly necessary. This article is based on the development of automated high-power fire pump test device, the pump test device design elements to summarize for peer reference. 2. The composition of the pump test device A complete pump test device should include the following major parts: 1). Power source; 2). Drive system; 3). Measurement and control system; 4). Auxiliary system; 3. The design elements of each component 3.1 Power source a. Clear the test object to determine the power source power unit design test device for different purposes, and some just for the unit's products for testing purposes, and some need for a variety of pumps (such as the test center), so the power Source of power should be based on the actual situation to determine. Taking the system shown in Fig. 1 as an example, the calculation formula is as follows: P = P pump / (η tooth × η twist × η × η pump) = Q × P × H / (102 × η tooth × η twist × η × η pump) where: P power needed to move the power output KWP pump test pump water power KWη gearbox efficiency% η torsional torque meter efficiency% η clutch efficiency% η pump efficiency of the pump% Q pump Flow m3 / sH Head of the pump mV Severe water Kg / m3 We can η pump as a reference, by calculating the relationship between P and P pump curve (Figure 2), the calculation can be assumed to η tooth, η twist And η were 0.95, 0.98 and 0.98, respectively. When the P pump and the η pump are known, the required power source output power can be determined from FIG. 2. b. Power source type Currently there are two kinds of motor and diesel engine. The former generally not speed, suitable for general industrial pumps. Due to the difference in the rotational speeds of various industrial pumps, the parameters such as flow pressure and pressure of the pump generally need to go through the measurement values ​​under a specific rotational speed (motor speed) to the corresponding values ​​at the specified rotational speed of the pump, resulting in amplification of the measurement error. The former for speed, DC motor available SCR speed, AC motor speed control available, but the higher the cost. Of course, the use of motor has relatively low noise, no other pollution advantages; the latter applies to the fire pump, fire pump because there are changes in conditions require speed changes. Diesel engine speed more convenient. Regulate the throttle size and then with the gear box, you can get a larger speed range, and the cost is relatively low. The use of diesel engines there is noisy, flue gas emissions. What kind of power source should be selected depends on the design purpose of the test device and the unit's location, funding and existing relevant conditions. 3.2 transmission system Diesel engine using the pump test device, a transmission problem. Transmission system is mainly composed of clutch and gear box. The gearbox design, the main two issues should be considered: a. Ratio determination for industrial pumps, the center of 800mm high below the pump, the speed is generally 1450r / min and 2900 ~ 2950r / min. Fire pump, its speed vary widely, usually 2000 ~ 4000r / min. Determination of gearbox ratio, it is necessary to consider to meet the test requirements of different speed pump, but also consider allowing the engine to work near the maximum torque point.
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