JPS58224593A - Controlling method for flow rate and pressure - Google Patents

Abstract

PURPOSE:To stably control a motor by isolating an inverter from the motor when a trouble occurs at the inverter, switching a control mechanism to manual operation, and switching to an automatic operation when the motor is reset to the vicinity of the rotating speed immediately before the trouble. CONSTITUTION:An inverter input/output switch 17 is opened by a trouble signal which is generated at the trouble production time due to the trouble of an inverter 10, the inverter 10 is isolated from a motor 9, and an inverter output controller 12 is switched to manual operation. Simultaneously, a vane opening degree controller 14 is switched to manual operation in the state that the output at that time is maintained. When the motor 9 is returned to the vicinity of the speed immediately before the trouble, i.e., the exhaust flow rate of a blower 5 is returned substantially to the value immediately before the trouble, a vane opening degree controller 14 is switched to automatic operation. When the controller 14 is switched to the automatic operation, the opening degree of the vane 13a is automatically adjusted as the motor 9 is accelerated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a control mechanism (control device) that controls the discharge flow or pressure of a fluid supply source such as a pump or blower by adjusting the opening of a control valve, vane, damper, etc. and fluid supply source tg#
and an inverter that controls the rotational speed of the electric motor to control the discharge wave 1 or pressure of the fluid supply by operating the city control mechanism by adjusting the throttle p once and controlling the number of times of the motor by the inverter. Flow rate and pressure in the event of an accident in the inverter
Regarding the 1 force method.

First, the conventional method will be explained with reference to FIG.

In FIG. 1, 1 is a boiler for heating water supplied from a water supply source 2 and converting it into high-temperature steam for charging, 3 is a steam extraction pipe, and 4 is a steam generator. 5 is a blower for blowing air to boiler l, and 6 is a blower with an air output of 50 g! t-g for preheating by heat exchange with the exhaust gas from island 1 exhausted to chimney 7! The air pre-amplifier t8 is filled with an air wave n generator.

9 is a retroactive motivation for blower 5, and 10 is this (motive 9)
An inverter (I2T variable pressure-frequency variable device t) that controls the discharge flow rate of the wind blower 5 by controlling the rotation speed of the
12tL is a steam flow rate, a regulator for adjusting the output t' of the inverter lO based on the output of the air flow type transmitter a4.8, and 12b is an automatic manual cutting device. , these constitute the output control device 12 of the inverter IO.

Conventionally, the inverter output control device 12
Manually or automatically convert the output of O to i&l1, and
The discharge 5 of the blower 5 by controlling the
A method of Jlt-tttt+n is adopted. This method has the advantage of eliminating the need for the controller m that controls the opening of the throttle 9 that controls the discharge flow rate of the blower 5, but the inverter lO
In the event of an accident due to a malfunction, etc., to ensure safety,
and the operation of boiler 1 is stopped. However, since it is not easy to open the equipment such as boiler 1, it is required to operate the equipment in a delayed manner without interrupting the operation of the equipment. If the process is round, it is necessary to operate the device 11t continuously.

The present invention has been made to meet this requirement of 4t.It is also equipped with a control mechanism for the discharge or pressure of the adult supply source, and when an inverter VC accident occurs, the inverter VC is activated based on the accident signal. At the same time, the controller was switched to manual operation, the M was unplugged for a predetermined period of time, the electric motor was connected to it and driven, and the motor stopped rotating immediately before the accident. Provided is a control method that can realize stable +ft1J control by suppressing fluctuations in current or pressure to a small level without switching the control mechanism to automatic operation and stopping the operation of the device when the system returns to normal operation. It is something to do.

An embodiment of the method of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram of the configuration when the method of the present invention is applied to control the flow rate of a blower of a boiler, and 1 to 12 are the constituent parts of the above-mentioned series P. 13 is the air blowing, the discharge flow from the rocky shore 5 jt k ta
lj What is the Tl1111111 mechanism for operating the vane 13a? 14 is a vane operating device that operates the vane 131L based on the output of the s'A flow rate transmitter 4 of the boiler 1 and the air flow of the blower 5 based on the output of the transmitter 8. Opening degree T Vane operating device 13
s14't14b, which is a vane opening i+++-device for manually or automatically adjusting the vane opening 11b, is a panel adjustment device and an automatic manual switching device that constitute this vane opening/direction control device I4, and is a bumpless switching device. At* the machine.

15 causes the control device l11.12e14 to perform manual/automatic switching operation based on the signals from the inverter output mJ control device 12, the vane opening degree control device 1t14, and the signal from the sequence circuit w116. Output operation notes for the input/output switch 17 and the switch 18 of the commercial power supply 11 to the sequence 1g1M16 and open/close 517, 18
This is a sequence circuit for performing operations such as instantaneous stop.
It is also equipped with an IT restart circuit. 16 is the switch 17~
19, the operation of the inverter 10, etc., the output of the t-sequence circuit 15, or the operation signal of the operator, can be performed before the operation of the switches 17 to 19 and the inverter 10!
This is an air sequence circuit for outputting the a signal to the sequence circuit 15. The configuration of the sequence circuit 16 is not an essential feature of the present invention and can be constructed using conventional techniques, so a detailed explanation thereof will be omitted.

The sequence circuit 15 has a configuration as shown in the second diagram. In Fig. 2, the rod 21 is the automatic hand hJh switch 12b.
Output sub (jnlf+II4 t,, m production te'
l'-Ui')e11'''〇-hand wJl!il
An OR circuit that uses human power to set "0" when operating, 111) and the output B of the AND circuit a, :gikoo,ta1gI
g! Output S1 of 1121 and output 8+ of switch 12m)
mb and the output B1tC of the inverter input/output switch 17 (m1# when closed, "0" when open)? When the output S = 11' with an AND circuit using 1" human power, the inverter output control device 12
Switch to automatic operation, output S, 8@o# and g+ operation. ” indicates that an Inverme IOK accident has occurred and the accident signal is 8.
When s-@l' is obtained, 11 (when it becomes 11 from "0", 11) is a delay circuit that delays the fault signal sI by a predetermined time Tt7e, which is the output B of this delay till path.

The extension circuit j is a NAND circuit which inputs the output 'ti of the 4 extension circuit B and the accident signal 131, and whose output S, becomes 10# only for a predetermined time T after accident No. 11 S1 becomes 111. The predetermined time T is the NAND circuit station, and the AND circuit j
It is established at the time when the blade is activated. 27 is a sales note for a predetermined time T when the output 8 of the ANDlI circuit 40 changes from 1 to 0.

The delay circuit is a delay circuit that delays the accident by a predetermined time (Tt). The predetermined time T is the sum of the predetermined time T and the time required for the AND circuit, the OR circuit, and the AND circuit 31 to operate completely. 29 is the output l31 of the delay circuit 27°4
AND circuit with fyf3H as input, (to) output 8t4b of automatic manual vJ controller 14m (1 with self-m side cape operation)
1#, 0# when returning, 1 when returning to 101° with manual side valve operation) and output of AND circuit section 31 ``me e'
II is the OR circuit using human power, and jl is this OR circuit (capital).
output 8, output 83 of the NAND circuit section, and output 'tibk of the automatic manual switch 14t).
Output s1. When =@1#, the vane FIA degree control device 14 is switched to automatic operation, and when the outputs a, , , , @O'' are output, the vane FIA degree control device 14 is switched to manual operation.

Next, the operation of the present invention will be explained with reference to the configuration of disembarkation. In normal times, the fault signal 81-mO# is used as the opening/closing condition signal t-"Om of the inverter input/output switch 17 to close this mirror switch via the sequence circuit 16. Automatic manual switch 1
When 2b and 14b are operated manually, the output of this is 8.
AND circuit ρ, 3 due to Korean Ray “O” 18 Pride = 1”
Both outputs 'u*'al of 1 are 10'' 9, and the control devices 12 and 14 are set to manual operation.Reed automatic manual switching device 1
2bt - When operated on the automatic side, the output from this is 8smb
=@l" and the signal 8sy'=""l# caused by the closing of the inverter input/output switch 17), the output 8. of the AND circuit becomes 11#, and the control device 12 is automatically operated. No. 8 - When it is "O", the NAND circuit section comes out, and the output of the NAND circuit section is "11", so when the automatic manual adjustment IA device 14 b t - is operated to the automatic side, the automatic manual adjustment is performed. OR circuit (
8. becomes "1", so the output Ba1 of the AND circuit j1 becomes "1" and the control device 14 is switched to automatic operation.

The outputs of the control devices 12 and 14 are controlled manually or automatically based on the outputs of the steam transmitter 4 and the air wave quantity @1 device 8. 4m, and the output of the inverter IO or the output of the vane 13a is controlled based on this output. Inverter 10
By controlling the output of the motor, the rotational speed of the electric fIA 9 is increased by ml1, and the discharge ft amount of the blower 5 is controlled.

In this case, in order to reduce the pressure loss due to the vane i3a as much as possible and save energy, the opening degree t of the vane 13a is set to be fully open or close to fully open. When I did this, the electric wJ machine 90 rotation ridges were when I used dark electric stitch 11.
It gets lower.

If an accident occurs due to a failure of the inverter 10, the accident signal 8
1="l" (see Figure 3) is issued. This fault signal 8 current can be obtained by detecting, for example, the $t1 output pressure voltage voltage 411L current of the fuse of the inverter IO, the input current frequency, the current limiter abnormality, etc., and the detected wave can be arbitrary. Accident No. 4 81-"1" opened the inverter input/output switch 17 (see # in Figure 3), and disconnected the inverter 10 from the electrical machine 9, and also disconnected the inverter input/output switch 17. The signal sI? obtained by opening 10", the output of the AND circuit section becomes 0#, and the inverter output 111j nil device 12 is manually operated (see Figure 3).
At the same time, the output 88 of the p NAND circuit section is switched to the fault code 51=='1#. is ``0#'' during the time T determined by the delay circuit δ, so 1 and IIl
! l[;Jl output 'U is 1O'', p1 vane opening I
Switch the tIIIg4 device 14 to + dynamic operation (bumpless) while maintaining the current output (see Figure 3). The late #1H B1='1''' is manually applied to the delay circuit - and the predetermined time TI elapses. The signal Bu = “ which is output after a delay @ path
1# and output signal S when inverter input/output switch 17 is open
H""O#Q negative signal @1m causes ANDtg1w11
When the output B□ of 24 becomes "1#," the inverter input/output switch 1 closes the commercial power switch 418 (see 1# in Figure 3).
During the period from the opening of the switch 7 to the closing of the commercial power source open switch, the voltage does not change to the motor 9, and the blower 5 and the motor 9 rotate according to the natural deceleration characteristics due to rotational inertia, fluid resistance, etc. So, naturally Makoto 4 (rotation speed decreases) (jl
(See Figure G3) Accordingly, the discharge air flow rate of the blower 5 also decreases (See Figure 3). During this time, the opening degree of the first vane 13a is maintained by the vane opening degree control device 14 via the vane operating device 13 at the opening t (normally fully open or close to fully open IJjA) at the time of occurrence of the accident.

The predetermined time (delay time of RTL delay circuit β) is the time until it becomes safe for the device where the influence of the residual magnetic field of the motor 9 is small, and although it differs depending on the motor 9, it is usually 0.5 to 3 seconds. If TI is too short, it is inevitable that the current flowing into the power supply switch 9 when the power supply switch 18 is closed will be very large. Mayu T.

If it is long, the discharge flow rate of the blower 5 will decrease too much, which is not preferable.

By closing the opening/closing switch 18, the power supply 11 for p-music is connected to the electric motor 9 via the starting reactor, and the electric motor 9iFFs
Addition of power source 11 (increases the rotation speed of electric motor 9)
(See Figure 3) and accordingly increase the discharge loss of the air blower @5 (See Figure 3).The speed at which the electric motor 9 is accelerated is set to the speed at which the control device can respond. Electric (f
#i4 acceleration speed of i9 has startup reactor 4! t-use. Electric! When the IJJ machine 9 returns to U4 near the rotational speed just before the accident, that is, the air blowing and discharge vf, and the lid returns to the value almost immediately before the accident, an accident occurs and the accident signal S1W "l#" is activated.
The output Bta of the delayed delay circuit becomes "1" after a certain period of time T has passed since the accident occurred, and the AND circuit 290 output s39 becomes 11#, which is added to the AND circuit jHc via the 9117 circuit (9). .

At this time, the accident signal 8. = Negation of "l" No. 1g""
Since the output S, - of the delay circuit j whose input is 0'' becomes 0'' when the predetermined #INTs are passed through at the time of the accident occurrence, 3m@ at the output of the NAND circuit j is exactly ``1#''. This output S, = ""1" is written in the AND circuit I!131.
The output S of the OR circuit (source), s = u 1j-, becomes strong 16 hours after the oath, and the output date is 1 = ″l.
#, so switch to automatic operation (see Figure 3 fi) with vane opening 1j and 14i bumpless. Thereafter, when the delay circuit 427 is operated for a predetermined period of time T◆4ft, β1 becomes "0" and the output 8/1gJ road west becomes "0".

The predetermined time T, (the delay time of the delay circuit) is the torque customization of the exciter 9, the load t - the load torque characteristic of the Sahi motor 9, the rotation speed of the fan speed 5 - the discharge miscarriage characteristic, the opening city U of the vane i3a Changes in p flow rate @,, 1- determined based on control characteristics, characteristics of vane 13a, etc., and set at a time when fluctuations in electric current become small within the normal operating range *1lla In the example of the equipment used for If the time Ts that appears at 3.5 seconds is short, automatic control will be entered when the discharge amount is low, the vane 13a will temporarily operate in the opening direction, and then as the electric motor 9 accelerates, the flow rate will increase. As a result, the operation in the closing direction is delayed, resulting in slow fluctuations. In addition, since automatic control will be entered after Ts increases and flow rate increase III, the withdrawal of vane 131L is delayed.
m fluctuation becomes large.

When the vane opening degree control device 14 is ready for automatic operation, as shown in the third figure, the vane 131L is -
IL dynamically controls the discharge flow of the blower 5 automatically. Waiting until the rotational speed of the VTM engine 9 rises to the rated value, the starting reactor switch 19 is closed, and the inverter 10 is switched to the energizing switch 11 for t-photons.

It should be noted that the present invention is applicable not only to the blower 5 but also to a pump, and can perform sub-control and pressure ItlI control.

As is clear from the above explanation, according to the method of the present invention, the electric current supplying and stopping the fluid
In a device for controlling the discharge ftJl or pressure of a fluid supply source by controlling a rotary afi-inverter, the discharge ftJl or pressure t of a fluid supply source is
- A controller #l is installed to control the inverter 'eta machine i based on the accident signal when an accident occurs in the inverter.
At the same time, the itlIm machine is switched to manual operation and the vane opening is kept at the opening at the time of the accident.After a predetermined period of time has elapsed, the IE# machine is driven by connecting power supply 1 to it, and the electric motor is turned on. When the inverter returns to around 10 revolutions immediately after the accident, the throttle adjustment control mechanism is automatically operated using the pressure control method, so even if an accident occurs with the inverter, the equipment can continue to operate. The effect of being able to suppress the flow Jt or pressure fluctuation t-/' and achieve stable control 14I without stopping.

[Brief explanation of the drawing]

Fig. 1 is a configuration explanatory diagram showing an example of a device to which method t-''A of the present invention is applied, Fig. 2 is a principle t!!BA diagram showing an example of a sequence circuit in the present invention, and Fig. 8 is an operation diagram of the present invention. A time chart for explanation is shown. 5...Blower, 9......t
ILIIh machine, lO...Inverter,
I ・-, J1=%11
・・・・・・・・・1 power supply, 12・・・・・・・・・
Inverter output side #device, 12a...1
g4 device, 12k)... Automatic manual uJm device, 13a... Vane, 13...
...Vane operating device, 14...Vane opening/direction control device, 141L-°...Adjuster, 14
1)...Bunless Ia structure (automatic manual switch, 15...sequence circuit,
16... Electrical sequence circuit, 17.
...Inverter input/output switch, 18...
・・・・・・Picture use'4 miscellaneous switch, 19・・・・・・・・・
・Start reactor switch, eggplant...Start reactor.

Claims (1)

[Claims] In an apparatus for controlling the discharge flow vL or pressure of a fluid supply source (by controlling the rotational speed of the v1 drive that drives the body supply source with an inverter), the discharge flow t or pressure ir'aJ of the fluid supply source is If an accident occurs with the inverter, the inverter is switched off based on the accident sign and the control mechanism is switched to manual operation, and then after a predetermined period of time has passed,
I connected the power supply to the IIb bond and drove it, and when the electric machine returned to the number of revolutions it had just before the accident, it was 0.4+! 1IA
A flow rate/pressure control method that allows 4I# to be automatically operated.