JPS635189A - Flow rate and pressure control method - Google Patents

Abstract

PURPOSE:To enhance the power saving effect of a blower during rotational speed control operation, by changing the throttle opening degree of a control mechanism from an opening degree in the vicinity of the full opening degree to a predetermined throttle opening degree with the use of an opening degree position changing mechanism when a rotational speed control device fails. CONSTITUTION:when a rotational speed control device 8 fails, an automatic combustion control device 10 initiates the opening degree control of a damper 7 which is carried out such that an electromagnetic clutch 20 is turned off in accordance with a change-over signal S5 and a motor 16 is driven in the direction in which the damper 7 is closed to rotate a damper rotary shaft 17, and therefore, a damper drive link 18 is rotated to rapidly throttle the damper 7 to a predetermined throttle opening degree. Thereby. even though the rotational speed control device 8 fails, the damper 7 is rapidly closed so that it is possible to prevent the blower drive motor from increasing its rotational speed, and therefore, the damper 7 may be held at its full opening degree, thereby it is possible to enhance the power saving effect of the blower.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a control mechanism (operation) by adjusting the throttle opening of a control valve, vane, damper, etc. that controls the discharge flow rate or pressure of a fluid supply source such as a pump or blower. a rotation speed control device that controls the rotation speed of an electric motor that drives the fluid supply source,
The present invention relates to a method of controlling the discharge flow rate or pressure of a fluid supply source by operating the control mechanism by adjusting the throttle opening and controlling the rotation speed of the electric motor using the rotation speed control device, especially when an accident occurs in the rotation speed control device. Flow rate/pressure control method.

[Conventional technology]

The conventional method will be explained with reference to the first factor.

In Fig. 1, 1 is a boiler that heats water supplied from a water supply pipe 2, converts it into high-temperature steam, and takes it out, 3 is a steam extraction pipe, 4 is a fuel supply pipe that supplies fuel to the boiler 1, and 5 is a fuel It is an r4 adjustment valve. 6 is a blower for blowing air to the boiler 1, 7 is a damper for adjusting the discharge flow rate of the blower 6, 8 is a rotation speed control device for controlling the rotation speed of the electric motor that drives the blower 6, and 9 is a commercial power source. , 10 is boiler 1
Automatic combustion side to operate in optimal combustion condition? There are 11 devices.

Then, the steam pressure of the boiler 1 is detected and this detected steam pressure signal S is inputted to the automatic combustion control device 10, and the opening degree of the fuel adjustment valve 5 is adjusted based on the opening degree signal S2 outputted from this control device 10. In addition to adjusting the fuel supply amount, the output of the rotation speed control device 8 is also adjusted by the same (control signal S output from the control device IO) to control the rotation speed of the drive motor of the blower 6, and the discharge flow rate of the blower 6 ( By controlling the amount of combustion air supplied to the boiler 1, the boiler 1 can be operated in an optimal combustion state.

In addition, in order to control the discharge flow rate of the blower 6 in the event of an accident due to startup of the boiler l, shaft down, or failure of the rotation speed control device 8, the drive motor of the blower 6 may be changed to a rotation speed control device. 11 device 8 is automatically switched and connected to the drawing power source 9, and the discharge flow rate control of the blower 6 is controlled by the rotation speed control device 8 of the blower 6, and the rotation speed of the electric motor is controlled by the automatic combustion control device 10 of the damper 7. This can be done by switching to start-up control.

In the case of rotation speed control, it is desirable to maintain the opening degree of the damper 7 as close to full open as possible in order to minimize energy loss due to air resistance of the damper 7; When switching to , the drive motor of the blower 6 increases to the rotation speed corresponding to the commercial frequency, so if the damper 7 is opened to a large degree, the vibration (shock) to the boiler 1 becomes large.

Conventionally, in order to reduce this oscillation, even when controlling the rotation speed, the opening degree of the damper 7 was not kept close to fully open, but was kept as small as possible (
Normally, the engine was operated at a throttle speed of 10 to 401 degrees.

C Problems to be Solved by the Invention] Conventionally, for this reason, when controlling the flow rate by the rotation speed control device 8, the air resistance of the damper 7 was large, and the energy loss due to the damper 7 was large, and the original performance of the blower was not achieved by controlling the rotation speed. There was a problem that the power saving effect could not be fully demonstrated.

C. Summary of the Invention] In order to solve the above-mentioned problems, the method of the present invention drives a control mechanism 7 by throttle opening adjustment that controls the discharge flow rate or pressure of the fluid supply a6 and the fluid supply source 6 as shown in the figure. A rotation speed word that controls the rotation speed of the electric motor to control the discharge flow rate or pressure of the fluid supply source 6? 11 device j, during normal operation of the rotation speed control bag W8, the discharge flow rate or pressure of the fluid supply source 6 is controlled by the rotation speed control device 8, and in the event of an accident of the rotation speed control device 8, the fluid supply is controlled. Is the drive motor of A6 a rotation number word? 11 In a device in which the device 8 is switched and connected to a commercial power source 9 and the control mechanism 7 controls the discharge flow rate or pressure of the fluid supply source 6, the control mechanism 7
An opening position changing mechanism 2G is provided to switch the throttle opening between a fully open opening and a predetermined throttle opening, and the opening position is changed based on a switching signal S when an accident occurs with the rotation speed control device 8. The changing mechanism 26 is configured to change the aperture opening degree of the control mechanism 7 from an aperture degree near full open to a predetermined aperture aperture degree.

[Detailed description of the invention]

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 implemented to control the flow rate of a blower of a boiler, and FIG. 2 is an explanatory diagram of the configuration of an opening position changing mechanism for implementing the method of the present invention.

In FIG. 1, the discharge flow rate control of the blower 6 is normally performed in the same manner as in the conventional example described above. 11 by controlling the rotation speed of the drive motor of the blower 6 using the rotation speed control device 8.
In the event of an accident, etc., the automatic combustion control device IO can be used to control the opening of the damper 7.

1 and 2, reference numeral 11 indicates a link at? which is activated by the opening signal S2 output from the automatic combustion control device 10. At t, the marking part of the fuel adjustment valve 5 is connected to the damper drive shaft I2 that constitutes the opening degree position changing mechanism 26 of the damper 7. 13 is a pillow block that supports this damper drive shaft 12, and 14 and 15 are shaft flange joints. 16 is a DC motor for opening and closing the damper, 17 is a damper rotation shaft connected to this motor 16, 18 is a damper drive link attached to this damper rotation shaft 17, 19
This is a bellow block that supports the damper rotation shaft I7.

20 is an electromagnetic clutch provided between the damper drive shaft I2 and the damper rotating shaft 17; 21 is a joint metal fitting interlocked with the damper drive shaft 12; and the motor 16 is a joint metal fitting 2.
1 and is configured to rotate together with the rotation of the joint hardware 21.

22 and 23 are respectively fixed to this joint hardware 21, and when the damper opening is close to fully open, there is a stopper for detecting the limit of damper opening and a stopper for detecting the damper opening and the damper opening is narrowed down to a predetermined opening. damper aperture limit detection stopper 24, 2 for detecting this when
5 is attached to a damper rotation wheel 17, and the damper rotation shaft 17 is rotated in the damper opening direction or the damper closing direction by the damper opening/closing DC motor 16 to form a damper open limit detection stopper ♀2 or a damper aperture limit detection stopper 23. This is a shaft fixing metal fitting that comes into contact with the shaft to activate the torque switch of the motor 16 and stop the motor 16.

When switching from damper opening degree control to rotation speed control or vice versa, the electromagnetic clutch 20 is disengaged by switching signals S, , SS output from the automatic combustion control device 10, and the damper opening/closing DC motor 16 is switched in the damper opening direction or vice versa. The electromagnetic clutch 20 is connected when the motor 16 is driven in the closing direction and stops at the damper opening limit position or the damper throttle limit position.

Next, a control law will be described in which the boiler 1 is operated by controlling the discharge flow rate of the air a6 (the amount of air blown to the boiler 1) according to the method of the present invention.

In the case of damper opening control> Since the electromagnetic clutch 20 is in the connected state, the +/link mechanism 11 is actuated by the opening signal S2 output from the automatic combustion control device 10, and thereby the damper drive shaft 12
and the damper rotation shaft 17 to rotate the damper drive link 1.
8 to adjust the opening degree of the damper 7 and the opening degree of the fuel adjustment valve 5 to operate the boiler 1. At this time, the opening degree of the damper 7 is an opening degree of 1, usually 1, commensurate with the load.
It has a predetermined narrowing opening degree of 0 to 40χ.

When switching from damper opening control to rotation speed control
When switching back from damper opening control to rotation speed control when the rotation speed control device 8 becomes normal, etc., a switching signal S is output from the automatic combustion ft control device 10.

The electromagnetic clutch 20 is disengaged, the damper opening/closing DC motor 16 is driven in the damper opening direction to rotate the damper rotating shaft 17, and the damper drive link 18 is actuated to move the damper 7 in the opening direction. At this time, the blower 6
Since the drive motor is switched and connected to the rotational speed control device 8 from the commercial power source 9, the rotational speed of the air blower '4M6 gradually decreases.

When the damper rotating shaft 17 rotates and the shaft fixing fitting 24 hits the damper opening limit detection stopper 22, the torque switch built into the motor 16 is activated to stop the motor I6. At this time, the opening degree of the damper 7 is approximately 6 degrees (70 to 70 degrees) near the fully open position.
80z).

When the motor 16 stops, the electromagnetic clutch 20 is connected, and the openings of the damper 7 and the fuel adjustment valve 5 are adjusted by the opening signal S2 output from the automatic combustion control device IO in the same manner as before, and the boiler 1 is operated. .

Therefore, during rotation speed control, the damper 7 is linked to the output opening signal S2 of the automatic combustion control device 10 at a position close to fully open, so that the damper 7 can be operated at a position where air resistance is extremely small.

<When switching to damper opening control from the rotation speed side '4n> Since the drive motor of the blower 6 is switched and connected to the commercial power supply 9 from the rotation speed control device 8, the rotation speed of the blower 6 increases, so that the rotation speed of the blower 6 increases. It is necessary to return the damper 7 to the opening degree adjusted by the damper opening degree control in accordance with the rotational speed of the blower 6.

The switching signal S output from the automatic combustion control device 10 disengages the electromagnetic clutch 20 and drives the motor 16 in the damper closing direction to rotate the damper rotation shaft 17.
The damper drive link 18 is actuated to rapidly move the damper 7 in the closing direction.

The damper rotation shaft I7 rotates, and the shaft fixing fitting 25 is damped.
When rゝ・2,・ba hits the aperture limit detection stopper 23, the motor 16
A built-in torque switch operates to move the motor 16 to that position.
That is, the damper 7 is stopped at a position where the opening degree of the damper 7 reaches a predetermined narrowing-down of 10 to 40χ.

When the motor 16 stops, the electromagnetic clutch 20 is connected and the control returns to the damper opening control described above.

The damper opening limit detection stopper 22 and the damper aperture limit detection stopper 23 are fixed to a joint metal fitting 21, and this joint metal fitting 21 is connected to the damper drive shaft 12 which is rotated by the opening signal S2 output from the automatic combustion control device IO. Since it is always linked to the engine, switching between rotation speed control and damper control can always be performed in the optimal state. The original purpose of the joint hardware 21 is to store the position of the damper opening, but it also serves as a backup in case of clutch malfunction.

According to this embodiment, it is possible to memorize the damper opening degree when switching between rotation speed control and damper control, and to open the damper 7 to an opening degree as close to full opening as possible during rotation speed control. Therefore, not only can the stability of combustion in the boiler 1 be improved, but also the air resistance of the damper 7 during rotation speed control can be significantly reduced compared to conventional methods, and the energy loss caused by the damper 7 can be significantly reduced, resulting in the saving of the blower 6. It is possible to improve electric power. Furthermore, it is possible to smoothly shift from rotational speed control to damper control, thereby saving power and improving boiler safety.

As described above, according to the method of the present invention, the control mechanism 7 controls the discharge flow rate or pressure of the fluid supply source 6 by adjusting the throttle opening, and the rotation speed of the electric motor that drives the fluid supply source 6 is controlled to control the fluid flow rate or pressure. The rotation speed side that controls the discharge flow rate or pressure of the supply source 6? During normal operation of the rotation speed control device 8, the discharge flow rate or pressure of the fluid supply source 6 is controlled by the rotation speed control device 8, and in the event of an accident of the rotation speed control device 8, the fluid Is the drive motor of supply source 6 on the rotation speed side? In a device in which a 1fl device 8 is switched to a commercial power source 9 and a w control mechanism 7 controls the discharge flow rate or pressure of a fluid supply source 6, the aperture opening degree of the control mechanism 7 is set to an opening degree near full open. An opening position changing mechanism 26 is provided that switches to a predetermined throttle opening, and the opening position changing mechanism 26 changes the control mechanism 7 based on the switching signal 'ts' in the event of an accident with the rotation speed control bag w8. Since the opening degree of the throttle can be changed from the opening close to full open to a predetermined throttle opening, the fluid resistance of the control mechanism 7 can be reduced even when the rotation speed controller 8 is controlling the flow rate and pressure, and energy loss due to the throttle can be reduced. Since it can be made as small as possible, not only can power saving be improved, but also the transition between rotational speed control and damper opening degree control can be performed smoothly.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the configuration when the method of the present invention is implemented to control the IT amount of a blower of a boiler, and FIG. 2 is an explanatory diagram of the configuration of an opening position changing f3 mechanism for implementing the method of the present invention. 6... Fluid supply source i (blower), 7...
・Control mechanism (damper) by adjusting the aperture opening, 8...
...Rotation speed control device, 9...Commercial power supply, I8...
... Damper drive link, 20 ... Electromagnetic clutch, 22 ... Stopper for damper opening limit detection, 23 ... Stopper for damper aperture limit detection,
24, 25...Shaft fixing bracket, 26...
・Opening position changing mechanism, S,...Switching signal.

Claims (1)

[Claims] A control mechanism 7 that controls the discharge flow rate or pressure of the fluid supply source 6 by adjusting the throttle opening degree, and a rotation mechanism that controls the discharge flow rate or pressure of the fluid supply source 6 by controlling the rotation speed of the electric motor that drives the fluid supply source 6. During normal operation, the rotation speed control device 8 controls the discharge flow rate or pressure of the fluid supply source 6, and when the rotation speed control device 8 is in an accident, the fluid is controlled by the rotation speed control device 8. In an apparatus in which the drive motor of the supply source 6 is switched and connected to the commercial power supply by the rotation speed control device 8, and the control mechanism 7 controls the discharge flow rate or pressure of the fluid supply source 6, the throttle opening of the control mechanism 7 An opening position changing mechanism 26 is provided to switch between an opening near full open and a predetermined throttle opening, and the opening position changing mechanism 26 controls the rotation speed control device 8 based on a switching signal S_5 in the event of an accident or the like. A flow rate pressure control method in which the throttle opening degree of the mechanism 7 can be changed from an opening degree near full open to a predetermined throttle opening degree.