CN201354750Y - Fan and water pump power-saving device thereof - Google Patents

Abstract

The utility model provides a fan and a water pump power-saving device thereof. The power-saving device comprises an air pressure detection unit, a frequency conversion processing unit and a central processing unit, wherein the air pressure detection unit is used for detecting the pressure of the air output by the fan and obtaining pressure signals, and the frequency conversion processing unit is used for receiving frequency conversion signals and controlling the running frequency of a fan motor according to the frequency conversion signals; and the central processing unit is connected with the air pressure detection unit and the frequency conversion processing unit and is used for receiving, processing and sending signals including the pressure signals obtained by the air pressure detection unit and the actual measured air quantity of the fan obtained according to the relation between the pressure and the air quantity. When the actual measured air quantity is more than the working air quantity, frequency conversion signals for reducing the operation frequency of the fan motor is output to the frequency conversion processing unit. The utility model can effectively reduce the energy consumption of the fan.

Description

Blower fan and water pump battery saving arrangement thereof

Technical field

The utility model relates to blower fan, particularly relates to the blower fan that adopts converter technique.

Background technique

The relevant design code regulation of prior art, the air quantity nargin of factory floor is 5%～10%, blast nargin is 10%～15%.In design process, because of the resistance that be difficult to calculate pipe network, also need consider the variety of issue that takes place in the long-time running process, usually always the maximum quantity of wind of system and blast nargin foundation as Fan Selection.But the M﹠S of blower fan is limited, just up leans on when often choosing less than suitable blower fan model, therefore, workshop air quantity behind the blower fan is installed at present, blast nargin is more common greater than 20～30%.

Wherein, a kind of prior art blower fan leans on the aperture of damper or air channel barrier to satisfy the requirement of producing air quantity when operation.The blower fan mechanical property is a square torque characteristics, regulates the method for fan delivery by the aperture of damper, air channel plate washer or valve, is called throttling and regulates.In the throttling adjustment process, the blower fan inherent characteristic is constant, only depends on the aperture that turns down air door, baffle plate or valve, increases the resistance of pipeline artificially, increases the loss of pipe-line system thus, is unfavorable for blower fan, the energy-saving run of water pump.

Another kind of prior art blower fan adopts speed governer, by the rotating speed of change blower fan, thereby changes fan delivery to adapt to the needs of production technology, and this regulative mode is called the speed regulating control of blower fan.Blower fan is economized with above-mentioned speed-regulating controling mode operation energy consumption, and comprehensive benefit is higher.That the mode of speed regulation of AC motor has is multiple, wherein frequency control of motor speed is a speed-regulating scheme efficiently, and the output frequency of frequency control of motor speed is artificially to adopt adjustable resistance to set.

The inventor finds in practice, prior art adopts the blower fan of frequency control of motor speed to be difficult to be operated in optimal mode, reason is that its output frequency adopts artificial adjustable resistance to set, personal factor is bigger, being difficult to accurately to regulate blower fan according to the actual conditions at scene works under more excellent pattern, therefore air quantity, blast nargin often are in unreasonable state, the waste electric energy; And since no dynamic adjustments function, the artificial and time cost height that blower fan is safeguarded.

The model utility content

For being difficult to accurately be adjusted in work under the more excellent pattern, solution prior art blower fan cause the technical problem of waste of energy, the utility model that a kind of energy-conservation power-saving device of blower fan water pump and blower fan are provided.

For the technical solutions of the utility model that provide are provided be: a kind of power-saving device of blower fan water pump is provided, comprises: detect the blast detection unit that described blower fan is exported the pressure of wind and obtained described pressure signal; Receive frequency variation signal, and control the frequency-conversion processing unit of the operating frequency of described fan motor according to described frequency variation signal; Connect described blast detection unit and frequency-conversion processing unit, receive the described pressure signal that described blast detection unit obtains and handle, require to reduce the central processing unit of the described frequency variation signal of described fan motor operating frequency to described frequency-conversion processing unit according to described processing result output.

Adopt another technical solutions of the utility model for solving the problems of the technologies described above: a kind of blower fan, comprise the power-saving device of blower fan water pump of motor and control motor rotation frequency, described power-saving device of blower fan water pump comprises: detect the blast detection unit that described blower fan is exported the pressure of wind and obtained described pressure signal; Receive frequency variation signal, and control the frequency-conversion processing unit of the operating frequency of described fan motor according to described frequency variation signal; Connect described blast detection unit and frequency-conversion processing unit, receive the described pressure signal that described blast detection unit obtains and handle, require to reduce the central processing unit of the described frequency variation signal of described fan motor operating frequency to described frequency-conversion processing unit according to described processing result output.

Above technological scheme is different from the prior art blower fan and causes the technical problem of waste of energy because of being difficult to accurately be adjusted in work under the more excellent pattern as can be seen, and the utility model obtains the current actual measurement air quantity of blower fan by the discharge pressure of fan of automatic detection blower fan.When in case detected actual measurement air quantity requires greater than described work air quantity, then send the operating frequency that frequency variation signal reduces fan motor automatically, regulate the too high air quantity output of blower fan, finally can make the actual measurement air quantity of blower fan require consistent with the work air quantity, when not influencing blower fan work, reduce the operating frequency of fan motor, realize effective purpose of energy saving; The utility model adopts full cut-off ring automatic control system, reduces or removed from the manually-operated time, realize easily, raise the efficiency and also cost low.

Description of drawings

Fig. 1 is the theory diagram of the utility model blower fan mode of execution;

Fig. 2 is the utility model blower fan energy-saving principle schematic representation;

Fig. 3 is the theory diagram of the utility model power-saving device of blower fan water pump mode of execution.

Embodiment

By Hydrodynamics Theory as can be known, the output flow Q of most of fluid transmission equipment (as centrifugal oil pump, blower fan etc.) is directly proportional with its rotation speed n; Square being directly proportional of delivery pressure P (lift) and its rotation speed n; Output power N is directly proportional with the cube of its rotation speed n, can be expressed as with mathematical formulae:

Q＝K1×n

P＝K2×n2

Make blower fan work be in more excellent or optimization model, save labour turnover when saving power consumption.

In other the utility model blower fan mode of executions, the operation of output frequency variation signal is handled by the frequency reducing computing unit in the described central processing unit, such as integration (PID) regulator.Described frequency reducing computing unit is used at described actual measurement air quantity during greater than work air quantity requirement, draw and described fan motor operating frequency is reduced to the actual measurement air quantity that is enough to make described blower fan output requires corresponding to frequency variation signal, and the output frequency variation signal is to described frequency-conversion processing unit with the work air quantity.

Described fan motor operating frequency is reduced to here is enough to make the actual measurement air quantity of described blower fan output to require consistent with the work air quantity, be meant the corresponding relation of the fan motor operating frequency of measuring described actual measurement air quantity in advance and needing to adjust, as long as detect the blast of blower fan output wind and draw corresponding actual measurement air quantity, just can be according to described corresponding relation, calculating the fan motor operating frequency adjusted to is enough to make follow-up blower fan discharge pressure of fan power to reach the frequency variation signal of setting numerical value.

Fig. 2 is fan pressure H-air quantity Q curve characteristic figure, so that energy-saving principle of the present utility model to be described.

Wherein:

N1-represents the characteristic of blower fan when rated speed is moved;

N2-represents the characteristic of blower fan fall-back when the n2 rotating speed;

R1-represents blower fan pipe resistance drag characteristic hour;

Drag characteristic when on behalf of the blower fan pipe resistance, R2-increase to a certain array.

When blower fan was worked at characteristic curve of pipeline R1, operating point was A, and its flow pressure is respectively Q1, H1, and the required power of blower fan this moment is proportional to the product of H1 and Q1, promptly was proportional to the area of AH1 * OQ1.

Under the situation of blower fan rated speed, need reduce air quantity to Q2 according to technological requirement, the method of prior art is by increasing the resistance of pipe network pipe, make the operation point of blower fan move on to B point on the R2, blast increases to H2, at this moment the area of the required power direct ratio H2 * Q2 of blower fan promptly is proportional to the area of BH2 * OQ2.Obviously the required power of blower fan has increased.Though this regulative mode control is simple but power consumpiton is big, is unfavorable for energy-conservation.

After adopting the above-mentioned mode of execution of the utility model, detect air quantity by the blast detection unit, then according to on-the-spot actual air volume requirement, can drop to n2 by n1 by PID regulator control rotation speed of fan, at this moment the operation point moves on to the C point by the A point, and flow is still Q2, and pressure drops to H3 by H1.At this moment the required power of frequency control of motor speed rear fan is proportional to the product of H3 and Q2, promptly is proportional to the area of CH3 * OQ2, and the minimizing of power is significantly as seen from the figure, does not influence the proper functioning of blower fan simultaneously.

In addition, can increase man-machine interface with convenient observation and operation, such as increasing LCD interface, PVC keyboard and the LED light that connects described central processing unit.

Seeing also Fig. 3, is one of power-saving device of blower fan water pump mode of execution of providing of the utility model, and it comprises:

State detection unit (figure do not show) is used to detect the working state signal of blower fan control system;

The blast detection unit is used to detect the pressure of described blower fan output wind and obtain described pressure signal;

The frequency-conversion processing unit is used to receive frequency variation signal, and controls the operating frequency of the operating frequency of described fan motor according to described frequency variation signal;

Central processing unit, it connects described blast detection unit and frequency-conversion processing unit, be used for receiving, handle and send signal, comprise and receive the described pressure signal that described blast detection unit obtains, obtain the actual measurement air quantity of blower fan according to the pressure wind magnitude relation, when described actual measurement air quantity required greater than the work air quantity, output required to reduce the described frequency variation signal of described fan motor operating frequency to described frequency-conversion processing unit.

In another the utility model power-saving device of blower fan water pump, described calculate the fan motor operating frequency adjusted to be enough to make the pressure of follow-up blower fan output wind to reach the frequency variation signal of setting numerical value, can finish dealing with by integration (PID) regulator.

Described frequency-conversion processing unit can adopt sinusoidal wave pulse width to transfer the self-turn-off device of (SPWM), and the frequency control of motor speed scope can adapt to the requirement of various speed control devices.The control accuracy height, it is ± 0.01% that the numeral of frequency-conversion processing unit is set resolution, it is ± 0.1% that resolution is set in simulation.

Described frequency-conversion processing unit frequency variator is a capacitive load, can effectively improve the power factor of motor, reduces reactive loss; Also have overcurrent, overvoltage, overload, multiple electronic protection such as overheated, and have abundant malfunction alarm output function, can effectively guarantee the normal operation of whole system; The startup of frequency conversion dragging system, stop and rate conversion process steady and smooth, comfortable feel is better; Two kinds of mode of operations of " manually " " automatically " are arranged, under the situation that frequency variator breaks down, still can continue operation by the manual work mode; And have Presentation Functions such as voltage, electric current, power factor, frequency.

Described central processing unit can be programmable controller (PLC), the perhaps computing unit of forming by PLC, PID regulator and integrated electricity-saving appliance, or, regulate output power according to actual conditions by the computing unit that pressure comparator, PLC and PID regulator are formed.In the computing unit of forming by pressure comparator, PLC and PID regulator, be provided with setting pressure in the pressure comparator, compare, difference is input to described PID regulator through PLC with wind pressure signal from the blast detection unit.

Below as can be seen, the utility model power-saving device of blower fan water pump can be followed the tracks of the variation and the requirement of real work air quantity of blower fan discharge pressure of fan power, automatically regulate the rotating speed of fan motor, regulate the air quantity of blower fan, actual measurement air quantity and the requirement of work air quantity are consistent, do not cut down the consumption of energy when not influencing the blower fan proper functioning.

Simultaneously, the soft start function of power-saving device of blower fan water pump and the characteristics of stepless speed control can realize the steady adjusting to blower fan, and can prolong the working life of machine.

More than a kind of blower fan provided by the utility model and power-saving device of blower fan water pump are described in detail, used specific case herein principle of the present utility model and mode of execution are set forth, above embodiment's explanation just is used for helping to understand method of the present utility model and thought thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.

Claims (5)

1. a power-saving device of blower fan water pump is characterized in that, comprising:

Detect the blast detection unit that described blower fan is exported the pressure of wind and obtained described pressure signal;

Receive frequency variation signal, and control the frequency-conversion processing unit of the operating frequency of described fan motor according to described frequency variation signal;

Connect described blast detection unit and frequency-conversion processing unit, receive the described pressure signal that described blast detection unit obtains and handle, require to reduce the central processing unit of the described frequency variation signal of described fan motor operating frequency to described frequency-conversion processing unit according to described processing result output.

2. power-saving device of blower fan water pump according to claim 1 is characterized in that, described frequency reducing computing unit is an integral controller.

3. power-saving device of blower fan water pump according to claim 1 is characterized in that, described frequency-conversion processing unit is the self-turn-off device that adopts sinusoidal wave pulse width to transfer.

4. power-saving device of blower fan water pump according to claim 1 is characterized in that described central processing unit is a programmable controller.

5. a blower fan comprises motor and the power-saving device of blower fan water pump of controlling the motor rotation frequency, it is characterized in that described power-saving device of blower fan water pump comprises:

Detect the blast detection unit that described blower fan is exported the pressure of wind and obtained described pressure signal;

Receive frequency variation signal, and control the frequency-conversion processing unit of the operating frequency of described fan motor according to described frequency variation signal;

Connect described blast detection unit and frequency-conversion processing unit, receive the described pressure signal that described blast detection unit obtains and handle, require to reduce the central processing unit of the described frequency variation signal of described fan motor operating frequency to described frequency-conversion processing unit according to described processing result output.

Images