CN214171234U - Energy-saving transmission device and electric equipment - Google Patents
Energy-saving transmission device and electric equipment Download PDFInfo
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- CN214171234U CN214171234U CN202020516922.9U CN202020516922U CN214171234U CN 214171234 U CN214171234 U CN 214171234U CN 202020516922 U CN202020516922 U CN 202020516922U CN 214171234 U CN214171234 U CN 214171234U
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Abstract
An energy-saving transmission device relates to the technical field of transmission. The utility model provides an energy-saving transmission device for carry out power transmission between power component and executive component. In the conventional design, in order to meet the requirement of simplifying a transmission system, the energy utilization rate of the motor is often low. The utility model discloses in, power component and executive component pass through energy-conserving transmission and connect. Through experimental research of the inventor, the arrangement of a proper energy-saving transmission device can reduce the energy consumption of the power assembly and improve the energy utilization efficiency. The utility model also provides an electric equipment, it includes foretell energy-conserving transmission. The power assembly and the execution assembly are both arranged on the electric equipment. The electric equipment has high energy utilization efficiency and can reduce energy consumption to a great extent.
Description
Technical Field
The utility model relates to a transmission technical field particularly, relates to an energy-conserving transmission and electrical equipment.
Background
When the traditional motor transmission device is designed totally, the working condition and the working requirement of a transmission execution system are required to be matched with the mechanical characteristics of a motor, the mechanical transmission system is simplified as much as possible, a transmission route is shortened, and the simplest mechanism is adopted to meet the working requirement. Although the arrangement can well meet the technical requirements in the field of motor transmission, the utilization rate of energy is not high, and the energy consumption is high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an energy-conserving transmission, it is used for carrying out power transmission between power component and executive component. The power assembly and the execution assembly are in transmission connection through the energy-saving transmission device. The energy-saving transmission device can reduce the energy consumption of the power assembly and improve the energy utilization efficiency.
The utility model also provides an electric equipment, it includes foretell energy-conserving transmission. The power assembly and the execution assembly are both arranged on the electric equipment. The electric equipment has high energy utilization efficiency and can reduce energy consumption to a great extent.
The embodiment of the utility model is realized like this:
an energy-saving transmission device is used for power transmission between a power assembly and an execution assembly, and the power assembly and the execution assembly are in transmission connection through the energy-saving transmission device. The energy-saving transmission device can reduce energy consumption and improve energy utilization efficiency.
In some embodiments of the present invention, the energy saving transmission is in belt transmission with the power assembly V.
In some embodiments of the present invention, the energy efficient transmission includes a gear box. The gear box is in transmission connection with the power assembly V belt and the execution assembly.
In some embodiments of the present invention, the gear box is selected from one of a first gear box, a second gear box, a third gear box, a fourth gear box and a fifth gear box. The transmission stages of the selected gear boxes are different, the transmission efficiency of the energy-saving transmission device is also different, and the finally improved energy utilization efficiency is also different.
In some embodiments of the present invention, the gear box includes a five-stage gear transmission, the gear box is provided with an input shaft and an output shaft that match the rotation axis of the gear, and the output shaft is detachably connected to the rotation axis of the gear. The input shaft is in transmission with the power assembly V belt, and the output shaft is in transmission connection with the execution assembly.
In some embodiments of the present invention, the first gear of the gear box is an acceleration transmission or a deceleration transmission, and cooperates with the V-belt transmission to adjust the input rotation speed of the actuator. The gear ratio of the second stage gear transmission to the fifth stage gear transmission of the gear box is 1: 1.
In some embodiments of the present invention, the input shaft is in driving connection with the rotational axis of the input gear of the first stage drive. The function of increasing and decreasing speed transmission can be realized no matter the gearbox adopts several stages of transmission.
In some embodiments of the present invention, the electric device includes the above energy-saving transmission device, and the power assembly and the executing assembly are both disposed on the electric device.
In some embodiments of the present invention, there is a four-stage transmission between the power assembly and the actuating assembly.
In some embodiments of the present invention, the electrically powered device is selected from one of a cantilevered stone cutter, a bridge-type circular stone saw, a rare earth extraction blender, and an air compressor.
The embodiment of the utility model provides an at least, have following advantage or beneficial effect:
the utility model provides an energy-saving transmission device for carry out power transmission between power component and executive component. In the conventional design, in order to meet the requirement of simplifying a transmission system, the energy utilization rate of the motor is often low. The utility model discloses in, power component and executive component pass through energy-conserving transmission and connect. Through experimental research of the inventor, the arrangement of a proper energy-saving transmission device can reduce the energy consumption of the power assembly and improve the energy utilization efficiency.
The utility model also provides an electric equipment, it includes foretell energy-conserving transmission. The power assembly and the execution assembly are both arranged on the electric equipment. The electric equipment has high energy utilization efficiency and can reduce energy consumption to a great extent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a gear box provided by an embodiment of the present invention.
Icon: 100-a gearbox; 102-an input gear; 104-a first gear; 106-second gear; 108-third gear; 110-a fourth gear; 112-fifth gear; 114-an input shaft; 116-output shaft.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the terms "first", "second", "third", and the like are used for distinguishing the description, and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be further noted that unless explicitly stated or limited otherwise, the terms "disposed," "mounted," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Examples
The embodiment provides an energy-saving transmission device for power transmission between a power assembly and an execution assembly. The power assembly and the execution assembly are in transmission connection through the energy-saving transmission device. When the traditional motor transmission device is designed totally, the working condition and the working requirement of a transmission execution system are required to be matched with the mechanical characteristics of a motor, the mechanical transmission system is simplified as much as possible, a transmission route is shortened, and the simplest mechanism is adopted to meet the working requirement. Although the arrangement can well meet the technical requirements in the field of motor transmission, the utilization rate of energy is not high, and the energy consumption is high. And the energy-saving transmission device can play the roles of reducing energy consumption and improving energy utilization efficiency.
The energy-saving transmission device is in transmission connection with the power assembly and the execution assembly respectively.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a gearbox 100. The energy saving transmission includes a gearbox 100. In this embodiment, the gearbox 100 is drivingly connected to the power assembly via a V-pulley. In other embodiments, the transmission connection between the gear box 100 and the power assembly may be other belt transmission manners such as flat belt transmission, or may also be meshing transmission manners such as gear transmission or other transmission manners, as long as the transmission connection between the gear box 100 and the power assembly can be achieved.
The gearbox 100 is in driving connection with the actuator assembly.
The belt transmission can alleviate load impact, and has the advantages of stable operation, low noise and low vibration. Meanwhile, the belt transmission is simple in structure, and the requirements of manufacturing precision and mounting precision of the belt pulley are looser than those of meshing transmission. And the center distance adjusting range of the two shafts with transmission is large, and later adjustment is convenient. The belt drive also has an overload protection function. The V-belt transmission is realized by pressing two side surfaces of a V-shaped belt and the side surface of a wheel groove to generate friction force to transmit power. The friction force of the V-belt drive is large compared to that of the flat belt drive, and large power can be transmitted. The V area structure is compacter than the flatband structure, and the V area is the drive belt of jointless quality moreover, and the transmission is more steady compared with the flatband.
In this embodiment, the gearbox 100 is a four-stage gear box, including four-stage gear transmission. The gearbox 100 includes an input gear 102, a first gear 104, a second gear 106, a third gear 108, a fourth gear 110, and a fifth gear 112. The input gear 102 is engaged with a first gear 104, constituting a first stage gear transmission. The first gear 104 is disposed coaxially with the second gear 106. The second gear 106 is engaged with the third gear 108 to form a second stage gear transmission. The third gear 108 is engaged with the fourth gear 110 to form a third stage gear transmission. The fourth gear 110 is meshed with the fifth gear 112 to form a fourth-season gear transmission. The rotating shafts (not shown) of all the gears are mounted to the gear box 100 via rolling bearings (not shown).
The first stage of gear transmission of the gear box 100 is a step-up transmission or a step-down transmission, and is in transmission fit with the V-shaped belt pulley to adjust the input rotation speed of the actuating element. The gear ratios of the second and subsequent gear transmissions of gearbox 100 are each 1: 1. In this embodiment, the gear ratio of the second gear transmission to the fourth gear transmission of the gearbox 100 is 1: 1. When a user selects the two-stage to four-stage transmission gear boxes respectively under the same condition, the input rotating speed of the actuating element is kept unchanged, so that on one hand, the stable work of the actuating element can be ensured, and on the other hand, the energy consumption conditions of the electric equipment adopting the gear boxes 100 with different transmission stages under the same working condition can be compared, and therefore the transmission stage with better energy-saving effect can be determined.
In this embodiment, the gear box 100 is provided with an input shaft 114 and an output shaft 116 that match the rotational axes of the respective gears, and the output shaft 116 is detachably connected to the rotational axes of the gears. The transmission stage number of the gearbox 100 is set to four stages, and then the output shaft 116 is detachably connected with the rotating shaft of the gear, so that when the gearbox 100 is installed, a user can randomly select one transmission stage number between the common first-stage transmission and the common fourth-stage transmission, and the use by the user is facilitated.
The input shaft 114 is drivingly connected to the input gear 102 of the first stage transmission. The function of speed increasing or speed reducing transmission can be realized no matter the gearbox 100 adopts several stages of transmission.
The working principle of the energy-saving transmission device is as follows:
the power assembly transmits motion and power through a V-pulley drive to the input shaft 114 of the gearbox 100 and then to the input gear 102. After passing through one or more gears within the gearbox 100, the output shaft 116 transmits motion and power to the actuator assembly.
The embodiment also provides an electric device. The electric equipment is a cantilever stone cutting machine. The cantilever type stone cutting machine comprises the energy-saving transmission device, and the power assembly and the execution assembly are both arranged on the cantilever type stone cutting machine.
In the embodiment, four-stage transmission is shared between the power component and the executing component.
Test example 1
The test example measures and calculates the load current and the active power consumption when the cantilever type stone cutting machine works under the specified load after the energy-saving transmission device is installed on the cantilever type stone cutting machine. Under the appointed load, cantilever type marble cutter can reach rated operating mode, makes the rotational speed of executive component for rated rotational speed 300 revolutions per minute.
The power component of the cantilever stone cutting machine is a motor, the original transmission component is a primary V-shaped belt pulley for speed reduction transmission, and the transmission efficiency is 0.95.
The original motor of the cantilever stone cutting machine is replaced by a 15 kilowatt/4-pole three-phase motor, the 15 kilowatt motor is in speed-increasing transmission connection with an input shaft 114 of the gearbox 100 through a primary V-shaped belt pulley, and an output shaft 116 is in transmission connection with a rotating shaft of the first gear 104. The first stage of gearing in gearbox 100 is speed reductionAnd the output shaft 116 is in transmission connection with the executing component through a coupler. The motor drives the executing component to realize three-stage speed-increasing transmission. Transmission efficiency eta of coupling10.99, 2 pairs of rolling bearing transmission efficiency eta20.98, 1 pair of gears η30.98V-belt pulley transmission efficiency eta40.95, the transmission efficiency eta of the transmission assembly is obtaineda＝0.99×0.98×0.982×0.95＝0.885。
It is measured that: when the motor is in idle load, the idle load current of the motor is 22 amperes; when the motor works under the rated working condition, the three-phase load current of the motor is 27.5 amperes on average.
According to the load current 27.5A of the motor, the following load data of the motor can be calculated:
(1) the known apparent power is: sC1.732 × 0.38 × 27.5 ═ 18 kVA; kVA is kilovolt-ampere, apparent power unit.
(2) No-load current (electrical engineering manual K ═ 4.2):
(3) Load power:
(4) Reactive power:
kvar is the unit of kiloVAs, reactive power.
(5) Load current:
a is amperes, current units.
(6) Reactive power ratio:
the natural power factor of the motor is checked to be 0.75 through a reactive power ratio table, the natural power factor cannot reach the national standard, electric energy waste is caused, and reactive compensation is carried out when the power factor is improved to be 0.9.
And (4) table lookup: coefficient K is 0.398, required capacitance compensation capacity: q13.5 kW × 0.398 5.373 kvar.
The results after compensation are shown in table 1:
TABLE 1 Compensation results
Compensated load current:
active power loss:
kW.h is kilowatt-hour, energy unit.
Test example 2
The test example measures and calculates the load current and the active power consumption of the bridge type circular stone sawing machine during working under the specified load after the energy-saving transmission device is installed. Under the appointed load, the bridge type circular stone sawing machine can reach the rated working condition, so that the rotating speed of the executing assembly is 270 revolutions per minute at the rated rotating speed.
The power component of the bridge type circular stone sawing machine is a motor, and the original transmission component is a two-stage speed reduction transmission formed by V-shaped belt pulley and gear transmission. V-belt pulley transmission efficiency eta10.95, 2 pairs of rolling bearing transmission efficiency eta20.98, 1 pair of gears η30.98. Therefore, the transmission efficiency eta of the original transmission assemblya＝0.98×0.982×0.95＝0.89。
The original motor of the bridge type circular stone sawing machine is replaced by a 18.5 kilowatt/4-pole three-phase motor, 18.5The kilowatt motor is in transmission connection with an input shaft 114 of the gearbox 100 through a V-shaped belt pulley of an original transmission assembly, an output shaft 116 is in transmission connection with a rotating shaft of the first gear 104, and primary transmission is carried out in the gearbox 100, so that 2 pairs of rolling bearings are involved. The output shaft 116 is in driving connection with the input gear of the gear drive of the original drive assembly. The motor drives the executing component to realize three-stage speed reduction transmission. V-belt pulley transmission efficiency eta10.95, 3 pairs of rolling bearing transmission efficiency eta20.98, 2 pairs of gears η30.98. The transmission efficiency eta of the existing transmission assemblya＝0.983×0.982×0.95＝0.86。
It is measured that: when the motor is in idle load, the idle load current of the motor is 18 amperes; when the motor works under the rated working condition, the three-phase load current of the motor is 29 amperes on average.
According to the load current 29A of the motor, the following load data of the motor can be calculated:
(1) the known apparent power is: sC＝1.732×0.38×29＝19kVA。
(2) No-load current (electrical engineering manual K ═ 4.2):
(3) load power:
(4) reactive power:
(5) load current:
(6) reactive power ratio:
the natural power factor of the motor is found to be 0.74 through a reactive power ratio table, the natural power factor cannot reach the national standard, electric energy is wasted, and reactive compensation is carried out when the power factor is increased to 0.9.
And (4) table lookup: coefficient K is 0.425, required capacitance compensation capacity: q is 14kW multiplied by 0.425 5.95 kvar.
The results after compensation are shown in table 2:
TABLE 2 Compensation results
Compensated load current:
active power loss:
test example 3
The test example measures and calculates the load current and the active power consumption of the rare earth feed liquid tank body when the rare earth feed liquid tank body works under the specified load after the energy-saving transmission device is installed. Under the appointed load, the rare earth feed liquid cell body can reach rated operating mode, makes the rotational speed of executive component 300 revolutions per minute for rated rotational speed.
The rare earth feed liquid trough body power component is 2 motors, each motor uniformly drives 5 mixers through the speed reduction of a first-level V-shaped belt pulley, and the mixers are execution components. V-belt pulley transmission efficiency eta1＝0.95。
The original motor of the rare earth feed liquid tank body is replaced by a vertical motor with 0.75 kilowatt, the vertical motor is in transmission connection with an input shaft 114 of the gear box 100 through a V-shaped belt pulley of an original transmission assembly, an output shaft 116 is in transmission connection with a rotating shaft of the third gear 108, secondary transmission is carried out in the gear box 100, and the gear box relates to a 3-pair rolling bearing. The output shaft 116 is in transmission connection with the actuating assembly through a coupling. Is transmitted to an execution component by a motor and is fourAnd step speed reduction transmission. V-belt pulley transmission efficiency eta10.95, 3 pairs of rolling bearing transmission efficiency eta20.98, 2 pairs of gears η30.98, the transmission efficiency eta of the coupling40.99. The transmission efficiency eta of the existing transmission assemblya＝0.983×0.982×0.95×0.99＝0.846。
The intelligent electric meter (model: DTZY 188-Z; meter number: 13000132448) is connected in series with 1 multifunctional network instrument (model: PD866E-9S4), and the electric power consumption is measured by adding a first-stage V-belt speed reduction uniform transmission 5 stirring machines to a 0.75 kilowatt motor transmission device under the condition of no local reactive compensation, and the measured data of the two intelligent electric meters are the same. The measured result is as follows: the phase voltages are 225 volts, 227 volts, 229 volts, respectively, so the average voltage is calculated to be 227 volts,
the load current is 1.77A, the active loss is 0.79 kW hour, the reactive loss is 0.93 Km hour, and the natural power factor is 0.64.
According to the load current of the motor being 1.77A, the following load data of the motor can be calculated:
(1) the known apparent power is: sC＝1.732×0.38×1.77＝1.16kVA。
(2) No-load current (electrical engineering manual K ═ 3.4):
(3) load power:
(4) reactive power:
(5) load current:
(6) reactive power ratio:
the natural power factor of the motor is found to be 0.5 through a reactive power ratio table, the natural power factor cannot reach the national standard, electric energy waste is caused, and reactive compensation is carried out when the power factor is improved to 0.9.
And (4) table lookup: coefficient K is 1.248, required capacitance compensation capacity: q is 0.58kW multiplied by 1.248 0.72 kvar.
The results after compensation are shown in table 3:
TABLE 3 Compensation results
Compensated load current:
active power loss:
test example 4
In the test example, the load current and the active power consumption of the magnesium heptahydrate stirrer during working under a specified load after the energy-saving transmission device is installed are measured and calculated. Under the appointed load, the magnesium heptahydrate stirrer can reach the rated working condition, so that the rotating speed of the executing assembly is 31 revolutions per minute at the rated rotating speed.
The power component of the magnesium heptahydrate stirring machine is a motor, the original transmission component is a three-stage speed reduction transmission formed by a V-shaped belt pulley and a gear, and the motor drives 1 stirring machine through the original transmission component. The original motor of the magnesium heptahydrate stirrer is replaced by a motor with 7.5 kilowatts/6 poles, the 7.5 kilowatt motor is in transmission connection with an input shaft 114 of a gear box 100 through a V-shaped belt pulley of an original transmission assembly, an output shaft 116 is in transmission connection with a rotating shaft of a first gear 104, and primary transmission is carried out in the gear box 100. The output shaft 116 is in driving connection with the geared input gear 102 of the original transmission assembly. The motor drives the executing component to realize four-stage speed reduction transmission. The 7.5 kilowatt/6 pole motor drives 3 mixers through the existing drive assembly.
It is measured that: when the motor works under the rated working condition, the average load current of the motor is 10 amperes.
According to the average load current of the motor being 10 amperes, the following load data of the motor can be calculated:
(1) the known apparent power is: sC＝1.732×0.38×10＝6.58kVA。
(2) No-load current (electrical engineering manual K ═ 3.4):
(3) load power:
(4) reactive power:
(5) load current:
(6) reactive power ratio:
the natural power factor of the motor is found to be 0.45 through a reactive power ratio table, the natural power factor cannot reach the national standard, electric energy waste is caused, and reactive compensation is carried out when the power factor is improved to 0.9.
And (4) table lookup: coefficient K is 1.5, required capacitance compensation capacity: q is 3kW multiplied by 1.5 0.72 kvar.
The results after compensation are shown in table 4:
TABLE 4 Compensation results
Compensated load current:
total active power loss:
the active power loss of one mixer is 2.96(kW · h)/3 ═ 0.99kW · h on average.
Test example 5
The test example measures and calculates the load current and the active power consumption of the air compressor during working under the specified load after the energy-saving transmission device is installed. Under the specified load, the air compressor can reach the rated working condition, the air compressor is under the pressure of 1.5 MPa, and the rotating speed of the execution assembly is the rated rotating speed 590 revolutions per minute.
The relevant data for the air compressor is as follows: model 4LW-44/22.5, exhaust volume 44m3/n (m3/n is cubic meter per gear, n is the gear pointed by the pointer, namely the actual discharge volume is 44 multiplied by n cubic meters), and exhaust pressure is 0.25 MPa.
The power component of the air compressor is a motor, the original transmission component is a flywheel coupling, and the motor output shaft 116 directly drives the compressor through the flywheel coupling. Transmission efficiency eta of coupling1＝0.99。
The original motor of the air compressor is replaced by a 110 kilowatt motor, the 110 kilowatt motor is in transmission connection with an input shaft 114 of a gear box 100 through a V-shaped belt pulley, and an output shaft 116The first gear 104 is connected with the rotating shaft in a transmission way, and the gearbox 100 carries out primary transmission, and 2 pairs of rolling bearings are involved. The output shaft 116 is in transmission connection with the actuating assembly through a coupling. The motor drives the executing component to realize three-stage speed reduction transmission. Transmission efficiency eta of coupling10.99, V-belt pulley transmission efficiency eta20.95, 1 pair of gear transmission efficiency eta30.98, 2 pairs of rolling bearings eta40.98. The transmission efficiency eta of the existing transmission assemblya＝0.982×0.98×0.95×0.99＝0.885。
It is measured that: and the load current of the motor is 182 amperes when the motor works under the rated working condition.
According to the load current 182A of the motor, the load rate of the motor can be calculated to be 68% (Kd is 0.68), which corresponds to the natural power factor
Thus: pc1＝Kd1Pe1＝0.68×110W＝75kW。
In the above case, reactive compensation is not performed, the natural power factor of the motor is 0.62 on average and cannot reach the national standard, so that electric energy is wasted, and reactive compensation is performed when the power factor is increased to 0.9.
Looking up a table, wherein the coefficient K is 0.781 required capacitance compensation capacity: q75 kW × 0.781 11.66 kvar.
The results after compensation are shown in table 5:
TABLE 5 Compensation results
Compensated load current:
active power loss:
comparative example 1
The load current and the active power consumption of the cantilever type stone cutting machine during working under the specified load before the installation of the energy-saving transmission device are measured and calculated. Under the appointed load, cantilever type marble cutter can reach rated operating mode, makes the rotational speed of executive component for rated rotational speed 300 revolutions per minute.
The power component of the cantilever type stone cutting machine is a 30 kilowatt/8-pole motor, the model of the motor is Y2-250M-8, and the data of each item are as follows: the power factor is 0.79, the efficiency is 91%, the rated current 63A and the rated rotating speed n are 730 r/min. The motor is transmitted to the execution assembly through the speed reduction transmission of the first-stage V-shaped belt pulley.
The original transmission component is a first-level V-shaped belt pulley for speed reduction transmission, and the transmission efficiency is 0.95.
It is measured that: when the motor is in idle load, the idle load current of the motor is 40 amperes; when the motor works under the rated working condition, the three-phase load current of the motor is 50 amperes on average.
According to the load current 50A of the motor, the following load data of the motor can be calculated:
(1) the known apparent power is: sC＝1.732×0.38×50＝33kVA。
(2) No-load current (electrical engineering manual K ═ 3.4):
(3) load power:
(4) reactive power:
(5) load current:
(6) reactive power ratio:
the natural power factor of the motor is checked to be 0.67 through the reactive power ratio table, the natural power factor cannot reach the national standard, electric energy waste is caused, and reactive compensation is carried out when the power factor is improved to be 0.9.
And (4) table lookup: the coefficient K is 0.624, the required capacitance compensation capacity: q22 kW x 0.624 13.728 kvar.
The results after compensation are shown in table 6:
TABLE 6 Compensation results
Compensated load current:
active power loss:
from the results of test example 1 and comparative example 1, it is clear that:
the motor running load current of the first-stage V-shaped belt pulley transmission is 50 amperes, and the motor running load current of the three-stage transmission formed by combining the V-shaped belt pulley and the gear is 27.5 amperes, so that the electric energy consumption can be reduced by 45% (1-27.5/50 is 45%) after the arrangement of the energy-saving transmission device is increased.
The load current 50A of the motor with the first-stage transmission is 79 percent of the rated current 63A of the motor with 30 kilowatts/8 poles, and the operation load current 27.5A of the motor with the third-stage transmission is 75 percent of the rated current 36.7A of the motor with 18.5 kilowatts/4 poles. Therefore, the mechanical equipment with one-stage transmission of the 30 kilowatt/8 pole motor can be replaced by a multi-stage transmission of the 18.5 kilowatt/4 pole motor.
The active power loss of the operation of the first-stage transmission motor after reactive compensation is 22 kilowatt hours, and the active power loss of the operation of the third-stage transmission motor after reactive compensation is 13 kilowatt hours. The energy-saving transmission device can save 41% (41% of 1-13/22) of electricity compared with the one-stage transmission.
The transmission efficiency of the primary transmission is 0.95 and the active power loss is 19.75 kilowatt-hours. The transmission efficiency of the three-stage reduction transmission is 0.885, and the active power loss is 12 kilowatt-hours. As can be seen from the comparison of the power consumption, the energy-saving transmission device not only does not reduce the transmission efficiency, but also provides a transmission efficiency 1.69 times (22/13-1.69) the same as the primary transmission.
Comparative example 2
The test example measures and calculates the load current and the active power consumption when the bridge type circular stone sawing machine works under the specified load before the energy-saving transmission device is installed. Under the appointed load, the bridge type circular stone sawing machine can reach the rated working condition, so that the rotating speed of the executing assembly is 270 revolutions per minute at the rated rotating speed.
The power assembly of the bridge type circular stone sawing machine is a 22 kW/6-pole motor, the model of the motor is Y2-200L2-6, and the relevant data of the motor are as follows: the power factor is 0.83, the efficiency is 90.5%, the rated current is 44.5A, and the rated rotating speed n is 970 revolutions per minute. The motor is in speed reduction transmission to the executing component through the transmission component
The transmission component is a two-stage speed reduction transmission formed by a V-shaped belt pulley and gear transmission. V-belt pulley transmission efficiency eta10.95, 2 pairs of rolling bearing transmission efficiency eta20.98, 1 pair of gears η30.98. Thus the transmission efficiency eta of the transmission assemblya＝0.98×0.982×0.95＝0.89。
It is measured that: when the motor is in idle load, the idle load current of the motor is 22 amperes; when the motor works under the rated working condition, the three-phase load current of the motor is 33 amperes on average.
According to the load current 33A of the motor, the following load data of the motor can be calculated:
(1) the known apparent power is: sC＝1.732×0.38×33＝21.7kVA。
(2) No-load current (electrical engineering manual K ═ 4.2):
(3) load power:
(4) reactive power:
(5) load current:
(6) reactive power ratio:
the natural power factor of the motor is found to be 0.68 through a reactive power ratio table, the natural power factor cannot reach the national standard, electric energy is wasted, and reactive compensation is carried out when the power factor is increased to 0.9.
And (4) table lookup: coefficient K is 0.594, required capacitance compensation capacity: q is 15kW multiplied by 0.594 8.91 kvar.
The results after compensation are shown in table 7:
TABLE 7 Compensation results
Compensated load current:
active power loss:
from the results of test example 2 and comparative example 2, it can be seen that:
the load current of the motor of the two-stage speed reduction transmission of the V-shaped belt pulley and gear combination is 33 amperes, and the load current of the motor of the three-stage speed reduction transmission of the V-shaped belt pulley and gear combination is 29 amperes. By comparison, it can be seen that the three-stage transmission reduces the electrical energy consumption by 12% (12% from 1-18/33) compared to the two-stage transmission.
The active power loss of the two-stage transmission motor after reactive compensation is 14.8 kilowatt-hour, and the active power loss of the three-stage transmission motor after reactive compensation is 13.5 kilowatt-hour. Thus, by increasing the setting of the energy-saving transmission, 9% (1-13.5/14.8-9%) of the power consumption can be saved.
The transmission efficiency of the two-stage transmission is 0.89 and the active power loss is 13.5 kilowatt-hours. The transmission efficiency of the three-stage reduction transmission is 0.86, and the active power loss is 11 kilowatt-hours. As can be seen from the comparison of power consumption, the energy-saving transmission not only does not reduce transmission efficiency, but also provides transmission efficiency 1.1 times (14.8/13.5 is 1.1) the same as that of the primary transmission.
Comparative example 3
The comparison example measures and calculates the load current and the active power consumption when the rare earth feed liquid tank body works under the specified load before the energy-saving transmission device is installed. Under the appointed load, the rare earth feed liquid cell body can reach rated operating mode, makes the rotational speed of executive component 300 revolutions per minute for rated rotational speed.
The rare earth feed liquid trough body power component is 2 motors, each motor uniformly drives 5 mixers through the speed reduction of a first-level V-shaped belt pulley, and the mixers are execution components. V-belt pulley transmission efficiency eta10.95. The motor of the rare earth feed liquid groove body is a JYP2 series horizontal motor with 1.5 kilowatt/6 poles, and the transmission efficiency eta of the V-shaped belt pulley1＝0.95。
The intelligent electric meter (model: DTZY 188-Z; meter number: 13000132448) is connected in series with 1 multifunctional network instrument (model: PD866E-9S4), and the electric power consumption is measured by adding a first-order V-belt speed reduction uniform transmission 5 stirring machines to a 1.5 kilowatt motor transmission device under the condition of no local reactive compensation, and the measured data of the two intelligent electric meters are the same. The measured result is as follows: the phase voltages were 225 volts, 227 volts, 229 volts, respectively, so the average voltage was calculated to be 227 volts and the line voltage was 393 volts
The load current is 2.76 amperes, the active loss is 0.81 kilowatt hours, the reactive loss is 1.71 kilowatt hours, and the natural power factor is 0.42.
According to the load current of the motor being 2.76 amperes, the following load data of the motor can be calculated:
(1) the known apparent power is: sC＝1.732×0.38×2.76＝1.8kVA。
(2) No-load current (electrical engineering manual K ═ 4.2):
(3) load power:
(4) reactive power:
(5) load current:
(6) reactive power ratio:
the natural power factor of the motor is checked to be 0.46 through a reactive power ratio table, the natural power factor cannot reach the national standard, electric energy waste is caused, and reactive compensation is carried out when the power factor is improved to be 0.9.
And (4) table lookup: coefficient K is 1.4496, required capacitance compensation capacity: q is 0.83kW multiplied by 1.4496 is 1.2 kvar.
The results after compensation are shown in table 8:
TABLE 8 Compensation results
Compensated load current:
active power loss:
from the results of test example 3 and comparative example 3, it is clear that:
the motor running load current of the first-stage V-shaped belt pulley speed reduction transmission is 2.76 amperes, and the motor running load current of the fourth-stage speed reduction transmission of the V-shaped belt pulley and gear combination is 1.77 amperes. By comparison, it can be seen that the four-stage transmission reduces the electrical energy consumption by 36% (1-1.77/2.76 ═ 36%) compared to the one-stage transmission.
The active power loss of the first-stage transmission motor after reactive compensation is 0.83 kilowatt-hour in operation, and the active power loss of the fourth-stage transmission motor after reactive compensation is 0.56 kilowatt-hour in operation. Thus, after the arrangement of the energy-saving transmission is increased, 33% (33% of 1-0.56/0.83) of the electricity can be saved.
The transmission efficiency of the primary transmission is 0.95, and the reactive power loss is 1.71 kilo-hours. The transmission efficiency of the four-stage speed reduction transmission is 0.846, and the active power loss is 0.93 kilo-hour. By contrast, the provision of an energy-saving transmission not only does not reduce the transmission efficiency, but instead provides a transmission efficiency that is 1.8 times (1.71/0.93-1.8) the transmission efficiency of the primary transmission.
Comparative example 4
In the test example, the load current and the active power consumption of the magnesium heptahydrate stirrer during working under a specified load before the energy-saving transmission device is installed are measured and calculated. Under the appointed load, the magnesium heptahydrate stirrer can reach the rated working condition, so that the rotating speed of the executing assembly is 31 revolutions per minute at the rated rotating speed.
The power component of the magnesium heptahydrate stirrer is a 5.5 kilowatt/6-pole motor, the original transmission component is a three-stage speed reduction transmission formed by a V-shaped belt pulley and a gear transmission, and the motor drives 1 stirrer through the original transmission component.
It is measured that: when the motor works under the rated working condition, the average load current of the motor is 7 amperes.
According to the average load current of the motor being 7 amperes, the following load data of the motor can be calculated:
(1) the known apparent power is: sC＝1.732×0.38×7＝4.6kVA。
(2) No-load current (electrical engineering manual K ═ 3.4):
(3) load power:
(4) reactive power:
(5) load current:
(6) reactive power ratio:
the natural power factor of the motor is checked to be 0.3 through a reactive power ratio table, the natural power factor cannot reach the national standard, electric energy waste is caused, and reactive compensation is carried out when the power factor is improved to be 0.9.
And (4) table lookup: coefficient K is 2.695, required capacitance compensation capacity: q is 1.4kW multiplied by 2.695 3.773 kvar.
The results after compensation are shown in table 9:
TABLE 9 Compensation results
Compensated load current:
total active power loss:
from the results of test example 4 and comparative example 4, it is clear that:
the motor running load current of the three-stage reduction transmission is 2.3 amperes, and the motor running load current of the four-stage reduction transmission is 1.66 amperes (5 amperes/3 equals 1.66 amperes), which indicates that the four-stage transmission reduces the electric energy consumption by 28 percent (1-1.66/2.3 equals 28 percent) compared with the three-stage transmission.
The load current of the motor of the three-stage transmission before reactive compensation is 7 amperes, which is 54% of the rated current of the motor of 5.5 kilowatts, which is 12.9 amperes, and the load current of the motor of the four-stage transmission before reactive compensation is 3.3 amperes, which is 64% of the rated current of the motor of 2.5 kilowatts, which is 5.16 amperes. Therefore, the mechanical equipment with three-stage transmission of the 5.5 kilowatt motor can be replaced by multi-stage transmission of the 2.5 kilowatt motor.
The active power loss of the three-level transmission motor is 1.4 kilowatt-hour in operation, and the active power loss of the four-level transmission motor is 0.99 kilowatt-hour in operation. Thus, by increasing the setting of the energy-saving transmission, 29% (1-0.99/1.4 ═ 29%) of the used electric power can be saved.
As can be seen from the comparison of the power consumption, the energy-saving transmission device not only does not reduce the transmission efficiency, but also provides a transmission efficiency 1.4 times (1.4/0.99-1.4) that of the three-stage transmission.
Comparative example 5
The test example measures and calculates the load current and the active power consumption when the air compressor works under a specified load before the air compressor is installed with the energy-saving transmission device. Under the specified load, the air compressor can reach the rated working condition, the air compressor is under the pressure of 1.5 MPa, and the rotating speed of the execution assembly is the rated rotating speed 590 revolutions per minute.
The relevant data for the air compressor is as follows: model 4LW-44/22.5, exhaust volume 44m3/n (m3/n is cubic meter per gear, n is the gear pointed by the pointer, namely the actual discharge volume is 44 multiplied by n cubic meters), and exhaust pressure is 0.25 MPa. The power component of the air compressor is a motor with 155 kilowatts, the model of the motor is JS137-10-155kw, and the relevant parameters are as follows: the rated voltage is 380V, the rated current is 291A, the rated rotating speed is 590 rpm, and the power factor is 0.875.
The transmission assembly is a flywheel coupling, and the output shaft of the motor directly transmits the compressor through the flywheel coupling. Transmission efficiency eta of coupling1＝0.99。
It is measured that: when the motor works under the rated working condition, the load current of the motor is 200 amperes. According to the motor load current 200A, the motor load rate 52% (Kd is 0.52) can be calculated, corresponding to the natural power factor
Thus: pc1＝Kd1Pe1＝0.52×155W＝80kW。
In the above case, reactive compensation is not performed, the natural power factor of the motor is 0.61 on average and cannot reach the national standard, so that electric energy is wasted, and reactive compensation is performed when the power factor is increased to 0.9.
And (4) table lookup: the coefficient K is 0.815. Required capacitance compensation capacity: q80 kW 0.815 65.2 kvar.
The results after compensation are shown in table 10:
TABLE 10 Compensation results
Compensated load current
Active power loss:
from the results of test example 5 and comparative example 5, it is clear that:
the motor operation load current of the direct drive is 135 amperes, and the motor operation load current of the three-stage drive of the V-shaped belt pulley and gear combination is 126 amperes, which shows that the three-stage drive after the arrangement of the energy-saving transmission device is increased can reduce 7% (1-126/135 ═ 7%) of electric energy consumption compared with the direct drive, and reduce 7% of the installed capacity of the motor matching mechanical equipment.
The direct drive motor operates with an active power loss of 80 kilowatt-hours and the tertiary drive motor operates with an active power loss of 74.6 kilowatt-hours. Thus, 6.8% (1-74.6/80-6.8%) of the power can be saved after the arrangement of the energy-saving transmission device is increased.
The transmission efficiency of the direct drive is 0.95 and the active power loss is 80 kwh. The transmission efficiency of the three stage step down transmission is 0.885 with an active power loss of 74.6 kilowatt-hours. As can be seen from the comparison of power consumption, the provision of an energy-saving transmission not only does not reduce transmission efficiency, but instead provides transmission efficiency equivalent to 1.07 times (80/74.6-1.07) that of a direct transmission.
Claims (6)
1. An energy-saving transmission device is used for power transmission between a power component and an execution component, characterized in that the power component and the execution component are in transmission connection through the energy-saving transmission device, the energy-saving transmission device comprises a gear box which is in transmission with the power assembly V belt, the gear box is in transmission connection with the executing component and comprises a five-stage gear transmission, the gear box is provided with an input shaft and an output shaft which are matched with the rotating shaft of the gear, the output shaft is detachably connected with the rotating shaft of the gear, the input shaft is in transmission with the power assembly V belt, the output shaft is in transmission connection with the execution assembly, the first-stage gear transmission of the gear box is speed-up transmission or speed-down transmission, and the transmission ratio from the second-stage gear transmission to the fifth-stage gear transmission of the gear box is 1: 1.
2. The energy efficient transmission of claim 1, wherein the gearbox is selected from one of a primary gearbox, a secondary gearbox, a tertiary gearbox, a quaternary gearbox, and a quinary gearbox.
3. The energy efficient transmission of claim 1, wherein the input shaft is drivingly connected to the rotational axis of the input gear of the first stage transmission.
4. An electrically powered device comprising the energy efficient transmission of any one of claims 1 or 3, wherein the power module and the actuation module are both disposed on the electrically powered device.
5. The electrically powered device of claim 4 wherein there is a common five speed transmission between the power assembly and the implement assembly.
6. The motorized apparatus of claim 5, wherein the motorized apparatus is selected from one of a cantilevered stone cutter, a bridge-type circular stone saw, a rare earth extraction blender, and an air compressor.
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