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Heat pump accounting for heat pump bearing housing and temperature control method

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1. Analysis of the results of heat transfer accounting. The influence of the lubricating oil on the heat transfer in the tank and the influence of the air density difference on heat transfer; the problem is the axisymmetric problem; thus, it can calculate a sector area; a, b is the bearing device orientation; The inside of the frame is water; the other is the box and the shaft; the box, the shaft and the air touch part are the air convection heat transfer gap. Figure 2 is the calculation result; the warm color is high temperature; the cool color is low temperature. Although the accounting analysis of the computer can be strong However, the practical engineering problems are sometimes very messy; the relevant accounting parameters have a certain approximation. This has an impact on the accuracy of accounting; in the accounting, there should be sufficient knowledge of this point. When analyzing the results of accounting, it is necessary to pay attention to the conditions of the gap. The effect of certainty. In the heat transfer accounting of the bearing housing; water convection heat transfer is the forced convective heat transfer of the volume loss of the pump; its heat transfer coefficient is associated with the volume loss of the pump; it should be able to be manipulated by the depiction. The scale error in production and processing leads to the uncertainty of volume loss; it also leads to the uncertainty of water convection heat transfer coefficient. The calculation indicates the change scale of heat transfer coefficient. Large; fire pump with specific speed ns=76; when the volume power is 90% to 98%; the heat transfer coefficient equivalent to its flow rate is generally 390W/m20?C~0?240W/m20?婀婺D Air convection heat transfer is natural convection heat transfer; its heat transfer coefficient is related to the environment where the pump is located; therefore, there is also uncertainty. Consider that the fire pump is generally installed indoors; the speed of air activity does not change much; The coefficient change will not be very large. If the wind speed is changed within the range of 0m/s~6. 4/s; according to the empirical formula; the air uniform heat transfer coefficient is 5W/m2. ?C to 25W/m20?娴Tomb D plan?
The water convection heat transfer coefficient is much larger than the air convection heat transfer coefficient; it is the dominant factor affecting heat transfer; together with the forced convection heat transfer can be manipulated by the painter. Thus, as shown in Figure 3, the water convection heat transfer coefficient, uniform air pair The two parameters of the flow heat transfer coefficient are investigated to investigate their influence on the accounting results. The temperature shown in Figure 3 is the highest temperature of the bearing housing; this point is generally located adjacent to the bearing of the pump impeller. The heating power of a single bearing is 1000W; The temperature is 20 ° C. It can be seen; because the change of the water convection heat transfer coefficient is much larger than the uniform air convection heat transfer coefficient; thus the water convection can affect the maximum temperature of the bearing box.
2, useful temperature control method in order to control the temperature can properly reduce the volume power; if the maximum temperature is not greater than 70? C; then the water convection heat transfer coefficient should not be less than 500w / m20? 妫徊 (14) source Song?? ?β始跋嘤α慵?叨?

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