CN2048175U

CN2048175U - Energy saving cooling tower of glass fibre reinforced plastics

Info

Publication number: CN2048175U
Application number: CN 88215994
Authority: CN
Inventors: 付敬远
Original assignee: No4 Design And Research Inst Of Commission On Machine Building Of State Co
Current assignee: No4 Design And Research Inst Of Commission On Machine Building Of State Co
Priority date: 1988-11-12
Filing date: 1988-11-12
Publication date: 1989-11-22

Abstract

The utility model discloses a water saving device. Cooling towers with general designs use single speed electrical machines whose power is confirmed by the wet bulb temperature of the hottest ten days of a year, and when the air temperature is low, the purpose of energy conservation can be achieved by adjusting the angle of the fan blades, providing a complicated operation. The utility model is provided with a pole-changing speed controlling electrical machine with changeable torsion, and the number of poles of the electrical machine is changed according to the variation of the air temperature to change the speed of the electrical machine and the output power, saving the power by 53.2%. The utility model is suitable for circulating systems of chilled water, is especially suitable to fiber glass steel cooling towers whose cooling water capacity of unit set is 1000-3500 meters +[3]/ hours, and is simultaneously suitable for places which have strict requirements for the noise of cooling towers.

Description

Energy saving cooling tower of glass fibre reinforced plastics

The utility model relates to a kind of water-saving device, is applicable to the cool cycles of air-conditioning, refrigeration and various industrial collings, and being particularly useful for the separate unit cooling water inflow is 1000～3500 meters ³/ hour glass fibre reinforced plastics cooling tower.

The cooling tower of general design uses single-speed motor, its power is determined by ten days the hottest wet-bulb temperature in 1 year, when temperature is low, can reach energy-conservation purpose by adjusting angle of fan leaves, complicated operation, also available many towers are in parallel to be used, temperature stops one or wherein some when low, but energy-saving effect is not too remarkable.

The purpose of this utility model is to improve above-mentioned weak point in the prior art and a kind of energy-conserving product that becomes the moment of torsion variable pole adjustable speed motor of equipping is provided.

The utility model compared with prior art has following advantage: simple to operate, cost is low, and energy-saving effect is remarkable, and noise is very low during low-speed running.

Task of the present utility model is finished by following approach: equipment becomes the moment of torsion variable pole adjustable speed motor in cooling tower, this motor designs according to the actual torque of blower fan of cooling tower when the different rotating speeds, quadratic power with moment of torsion and rotating speed is proportional, the cube of power and rotating speed is proportional, consider the principle selection performance number that efficient descends to some extent when low speed simultaneously, the number of poles that becomes moment of torsion buncher stator coil when pole-changing is respectively 6p, 8p, during 12p, its synchronous rotational speed is respectively 1000,750,500 rev/mins, the power output ratio is 1: 0.5: (0.19～0.15), according to the selected varying speed switch retaining of temperature Change, change the number of poles of coil of stator of motor, promptly change motor speed, moment of torsion and power output realize energy-conservation.

The utility model has the following drawings:

Fig. 1 is the counterflow cooling tower side cutaway view, 1 tower body wherein, 2 blower fans, 3 motors and decelerator, 4 cooling packing sheets, 5 hot water inlet pipes, 6 cold water outlet pipes, 7 silencer pads, 8 water dispensing apparatus;

Fig. 2 is the cross flow cooling tower side cutaway view, wherein 1 tower body, 2 blower fans, 3 motors and decelerator, 4 cooling packing sheets, 5 hot water inlet pipes, 6 cold water outlet pipes, 8 water dispensing apparatus.

Embodiment: cooling water flow is 3500 meters ³/ hour, design wet-bulb temperature W _B=27 ℃, inflow temperature t ₁=43 ℃, leaving water temperature t ₂=33 ℃ (GB7190-87), by Japanese Tokyo meteorological data, the outdoor wet-bulb temperature occurrence frequency time sees Table 1, if a user is arranged with three 3500 meters ³/ hour cooling tower parallel connection, W is worked as in the single speed operation _BIn the time of≤15 ℃, stop one in three towers, annual electricity consumption is: 160 * 3834 * 3+160 * 4926 * 2=3,416,640 degree.Adopt the utility model, pole-changing becomes the moment of torsion buncher and selects three position switch for use, the coil of stator of motor number of poles is decided to be 6p, 8p, 12p, its synchronous rotational speed are 1000 rev/mins, 750 rev/mins, 500 rev/mins, power output is 160KW, 80KW, 30KW, works as W _BMore than 23 ℃ the time, pole-changing becomes the moment of torsion buncher and adopts a retaining speed (1000 rev/mins of synchronous rotational speeds, power output 160KW), W _BIn the time of≤23 ℃, use two retaining speed (750 rev/mins of synchronous rotational speeds, power output 80KW) instead, W _BIn the time of≤15 ℃, use three retaining speed (500 rev/mins of synchronous rotational speeds instead, power output 30KW), annual electricity consumption is: 160 * 979 * 3+80 * 2855 * 3+30 * 4926 * 3=1,598,460 degree, the utility model compared with prior art economize on electricity 53.2%.

Table 1

Wet-bulb temperature W _B℃	More than 27	25～26.9	?23～24.9	??19～22.9
Wet-bulb temperature W _B℃	More than 27	25～26.9	?23～24.9	??19～22.9	Frequency time h	????5	????152	????822	????1394

Wet-bulb temperature W _B℃	15～18.9	11～14.9	??7～10.9	??3～6.9	Below 3
Wet-bulb temperature W _B℃	15～18.9	11～14.9	??7～10.9	??3～6.9	Below 3	Frequency time h	??1461	??1200	????1206	??1615	??905

Claims

1, energy-saving glass steel cooling tower, by tower body 1, blower fan 2, motor and reductor 3, cooling packing sheet 4, water inlet pipe and water outlet pipe 5,6, silencer pad 7 and water dispensing apparatus 8 are formed, it is characterized in that motor 3 is for becoming the moment of torsion variable pole adjustable speed motor, control with three-step timing, the coil of stator of motor number of poles is decided to be 6p, 8p, 12p, the respective synchronization rotating speed is 1000 rev/mins, 750 rev/mins, 500 rev/mins, the power output ratio is 1: 0.5: (0.19～0.15).