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Landscaping sprinkler and power take-off and water pump supporting applications and assembly - Vacuum sewage truck
Application and Assembly of Water Power PTO and Water Pump for Landscaping Sprinkler
Dongfeng Sprinkler is a special working vehicle for urban sprinkling and highway maintenance. Its functions have become more and more detailed and its use has become wider. The increase in the frequency of operations and the extension of continuous operation time also put forward higher requirements on the reliability of its use. In terms of the selection of pumps, currently many sprinkler manufacturers across the country use the special pumps for watering vehicles produced by Hangzhou Weilong Pumps Co., Ltd. However, its associated power take-off device suffers from frequent damages. The phenomenon is that it hits the teeth, scratches the teeth, and removes gears. What is the reason for this? The following discussion is on this issue.
1 Water Pump Performance Analysis and Comparison
The performance parameters of the pump mainly include flow, head, input shaft speed, shaft power, self-priming height, self-priming time, etc. The selection basis is mainly to meet the performance of the sprinkler. The specific selection standards vary among manufacturers. Here, only two types of self-priming sprinkler special pumps manufactured by Veyron Pumps are used as examples for comparative analysis. It can be seen that the main differences are: QZB series input shaft speed is 1480r/min, QZF series of input shaft speed is l150r/min, at this rated speed pump impeller speed is about 2900 ~ 3000r/min 2 water pump and power take-off and car engine matching calculation analysis. The pump running at rated speed is the best choice to ensure that its performance parameters reach the ideal state. When the speed ratio of the power take-off is selected, the required engine speed is also determined. The relation is the pump input shaft speed × power take-off speed. Ratio = engine speed.
Taking EQl092 series chassis and power take-offs as an example, the power take-off ratio is i1=1.167 and i2=1.373. The corresponding requirements for engine speed are: 1150× 1.167=l 342 ( QZF series), 1480×1.167=1 727 (QZB series) and 1150×1.373=1 579 (QZF series), 1480×1.373=2 032 (QZB series).
When the car is equipped with gasoline engine (EQ6100-1): the maximum torque is: 353 Nm/1 200 ~ 1 400 r/min, the maximum power is: 99 kW/3 000 r/min, the average speed of the engine is = 2 100 r/min When the car is equipped with a diesel engine (YC4110ZLQ): the maximum torque is: 430kW/l 600 ~ 1800 r/min, maximum power is 105 kW/2800 r/min, and the average engine speed is 2200 r/min.
Through the above analysis can be seen, such as the selection of ZQF series pumps, the power required by the power take-off of i1 = 1.167 engine speed 1342r/min, basically in the maximum torque of the gasoline engine speed range, and i2 = 1. The power take-off required by the PTO 37 is 1579 r/min, which is basically within the range of the maximum torque of the diesel engine. If ZQB series pumps are selected, the required engine speed of 1727 r/min for the power take-off with i1=1.167 is also within the range of the maximum torque of the diesel engine. At this time, the car is under the condition of maximum load, poor road conditions, overcoming all kinds of resistance and running at the maximum throttle and minimum speed. This situation is not conducive to the normal operation of the sprinkler, so it can be concluded that: The ZQB series pump is preferred for the gasoline chassis, and the power take-off with i=1.37 is best used. Diesel chassis such as the selection of ZQB series pumps, the best supporting the use of i = 1.37 power take-off, such as the selection of ZQF series pumps, the best supporting the use of i = 1.167 power take-off.
3 Analysis of the impact of the use status of the landscaping sprinkler on the service life of the power take-off.
Correct matching of sprinkler pumps, power take-offs, and automobile engines is a design factor that guarantees their proper operation. These are just the prerequisites for the reliability of the sprinkler. The daily correct operation and use state is the key condition for ensuring the service life of the power take-off. When the speed ratio of the power take-off is fixed, the driver's control of the engine throttle is the key to the operation speed of the water pump. The speed of the water pump directly affects the life of the power take-off. When the rotation speed of the water pump changes within 20% of the soil, the relationship between the flow rate, lift, shaft power and efficiency is Q1/Q2=nl/n2, Hl/H2=(nl/n2)2, Nl/N2=( N1/n2)3, η1≈η2. That is, the flow rate of the water pump is proportional to the rotation speed, and its head pressure is proportional to the square of the rotation speed, and its axis power is proportional to the cube of the rotation speed (when the rotation speed difference is large, the conversion error also increases, especially the efficiency error is greater. It needs to be determined by experiment).
Taking a 65QZB-50/110 pump as an example, when the input shaft speed is increased by 2032 r/min to 1.2, the engine speed is 2438 r/min, and the change in the pump characteristics is: 50×1.2=60 m3/h. 110 x 1.22 = 158.4 m, 24 x 1.23 = 41.47 kW.
Variations in flow and lift caused changes in flow rate, head loss, etc., and are not discussed here. The change of shaft power has less influence on the design of the pump with larger insurance factor, and the impact on the power take-off is fatal. The maximum power output of a general design for an automotive power take-off is 30 kW, which is sufficient to meet the drive and power requirements under normal circumstances. However, when driving a pump product, the power must be considered in proportion to the cube of the speed, since the power take-off is to be transmitted 41 .47 kW is much larger than the designed power of 30 kW, so damage to the power take-off is inevitable at this time, which should cause the power take-off manufacturers and users to pay high attention.
4 Conclusion
Based on the above analysis, it can be seen that, when the chassis of the sprinkler vehicle is fixed, the matching selection of the water pump and power take-off is a key factor to ensure its reliable and economical operation. The increase of the maximum output power of the power take-off design and the correct use of the user's status are decisive factors in reducing the power take-off fault. Only the power take-off plant, sprinkler refitting plant, and users can work together to ensure that the failure rate of the sprinkler in continuous operation is reduced to a minimum to improve the reputation of the power take-off plant, the landscaping sprinkler conversion plant, and the user’s Work efficiency.
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