JPS5923869Y2 - Governor control device for fluid couplings for rotating machinery - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a speed governor control device for a fluid coupling for rotating machinery, particularly a speed governor control device that controls speed by mechanically moving a variable element of the speed governor. be.

Various types of rotating machinery are used in various industrial fields, and these rotating machines are usually driven by motors, but in order to control their rotational speed, methods that control the rotational speed of the motor itself and constant speed rotation are required. 2. Description of the Related Art A method is known in which a motor is used and speed control is performed in a drive transmission section between the motor and a rotating machine.

The former motor speed control method is extremely common in small rotating machines and the like, but in large machines with large capacity, it may be difficult to control the speed of the motor itself or it may reduce efficiency.

As this type of large-scale rotating machinery, blowers such as air blowers and dust collectors used in various processes in steel mills are known, for example.In particular, recent blowers and others are used to recover heat and other waste energy generated within steel mills. In order to improve the energy recovery efficiency, many types of rotary machines are installed in each process of a steelworks, and in order to improve the energy recovery efficiency, the air volume control of these types of rotating machines must be strictly managed according to the characteristics of the location where they are installed. For this reason, accurate speed control was required.

Conventionally, rotating machines such as blowers used in steel mills use constant-speed rotating motors such as squirrel-cage induction motors, and the rotational driving force of this constant-speed rotating motor is transmitted to the blower via a fluid coupling. Desired speed control is performed by changing the transmission ratio.

The desired speed control is set in advance in the dust collector, for example, in accordance with the dust concentrations of various furnaces, or side splitting is controlled based on these dust concentrations.

Figure 1 shows the drive system of the aforementioned steelworks blower.
The rotational driving force of a constant speed rotating motor 12 such as a squirrel cage induction motor is transmitted to the rotating machine 10 via a fluid coupling 14 .

A speed governor 16 is connected to the fluid coupling 14, and by controlling the movement of the variable element of the speed governor using the control motor 18, the transmission ratio of the fluid coupling 14 is changed, and as a result,
Even when the constant speed rotating motor 12 is used, it is possible to arbitrarily control the rotational speed of the rotating machine 10.

Driving power is supplied to the constant speed rotating motor 12 and the control motor 18 via a power board 20, and the rotating machine 10
drive and its speed control.

In the past, the speed of the rotating machine 10 was also controlled manually by the operator, but in this case, automatic operation was not possible. The set value of the speed setter 22 and the speed signal value of the rotating machine 10 are supplied to the speed control device 24, and a control signal is supplied to the power panel 20, thereby controlling the control motor 18 by a predetermined amount. Feedback control has been performed in which the rotation is controlled, and as a result, the variable element of the speed governor 16 is mechanically moved to change the transmission ratio of the fluid coupling 14 to control the speed of the rotating machine 10 to a predetermined value.

The speed of the rotating machine 10 described above is detected by, for example, a plurality of limit switches 26 provided in the variable element movement path of the speed governor 16.
It is also possible to detect the rotational speed of the rotating machine 10 as a stepwise signal using the speed detector 28. In normal cases, if the speed detector 28 is used, stepless accuracy is achieved. This has the advantage of enabling precise speed control and automatic operation.

The speed setter 22 may be a variable setter programmed over time according to the characteristics of the rotating machine 10, or a plurality of speed setter groups 22-1 to 22- as shown in FIG. It is also possible to obtain a desired variable speed setting program by sequentially switching 4 using the relay switch group 30.

As described above, automatic operation is possible with the conventional device, but in practice there is a problem in that instability or bunching occurs in the control system, making it impossible to perform control with the desired responsiveness.

That is, in the conventional device, in order to control the movement of the variable element of the speed governor 16, as shown in FIG.
The output of is transmitted to the governor 16 via the reducer 32, but in the conventional device, only one series of reducer 32 was provided, so control corresponding to the characteristics of the rotating machine 10 could not be performed. There was a drawback.

That is, in a rotating machine 10, for example, a blower, its characteristics differ significantly depending on whether it is accelerating or decelerating.During acceleration, the characteristics are determined by the acceleration I/Lux applied to the blower and the blower inertia, while during deceleration, the characteristics of the blower are Its characteristics are determined by the air load and the stored rotational energy of the blower itself, and there is a significant difference between the two, so the conventional single-line reducer 32 shown in Fig. 3 does not provide optimal speed governing control during acceleration and deceleration. The problem was that it could not be done.

The present invention has been devised in view of the above-mentioned conventional problems, and its purpose is to provide an improved speed governor control device that can perform speed governor control according to the characteristics of a rotating machine.

In order to achieve the above object, the present invention transmits the rotational driving force of a constant speed rotating motor to a rotating machine via a fluid coupling, and controls the movement of a variable element of a speed governor that changes the transmission ratio of the fluid coupling. In a governor control device for a fluid coupling for rotating machinery, a control motor is used to move the variable element of the governor, and a reduction ratio can be adjusted to reduce the rotation speed of the control motor in accordance with the acceleration characteristics of the rotating machine. a first speed reducer; an acceleration clutch that detachably transmits the output of the first speed reducer to the speed governor; and a speed reducer that reduces the rotational speed of the control motor in accordance with the speed reduction characteristics of the rotating machine. It includes a second speed reducer whose reduction ratio can be adjusted and a speed reduction clutch that transmits the output of the second speed reducer to the speed governor in a freely engaging and disengageable manner. It is characterized by enabling speed control action.

Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 4 shows an embodiment of the governor control device according to the present invention. In this embodiment, the governor 16 that controls the speed of the rotating machine 10 in FIG. The system is characterized by being connected separately.

That is, the acceleration control system has an acceleration control motor 18a, and the driving force of the acceleration control motor 18a is transmitted to the first reduction gear 3.
2a and the speed governor 16 via the acceleration clutch 34a.
The movement of a variable element (not shown) can be controlled at a desired reduced speed.

The reduction ratio of the first reduction gear 32a can be arbitrarily adjusted, and the reduction ratio can be selected according to the characteristics of the rotating machine 10.

On the other hand, the deceleration control system includes a deceleration control motor 18b, and its driving force is transmitted through the second reduction gear 32b and the deceleration clutch 3.
4b to the speed governor 16.

The second reduction gear 32b can also adjust its reduction ratio,
Preferably, each of the speed reducers 32a and 32b is a device that can variably adjust the speed reduction ratio, such as a Beyer type speed reducer.

Then, the acceleration clutch 34 a and the deceleration clutch 3
4b is composed of, for example, an electromagnetic clutch that can be easily engaged and disengaged by an electrical command signal, and both clutches 34
The output shafts of a and 34b are connected to a speed governor to control the movement of the variable element.

The embodiment of the present invention has the above configuration, and its operation will be explained below.

When controlling the acceleration of the rotating machine 10, the acceleration control motor 18
a is activated, and the acceleration clutch 34a is controlled to be in the engaged state and the deceleration clutch 34b is controlled to be in the disengaged state.

At this time, the first reducer 32a is set to a reduction ratio according to the acceleration characteristics of the rotating machine 10, so that accurate acceleration control with good followability can be performed without causing hunting or other unstable conditions. It becomes possible to do this.

On the other hand, during deceleration, the deceleration control motor 18b is activated, the deceleration clutch 34b is engaged, and the acceleration clutch 34 is engaged.
By disengaging the second speed reducer 32 b, the speed reduction ratio is set to match the speed reduction characteristics of the rotating machine 10.
This makes it possible to obtain a desired deceleration control effect.

In the embodiment shown in FIG. 4, separate control motors 18a and 18b are provided for acceleration and deceleration, but in the present invention, this control motor is common and a single control motor is used for both clutches. A similar effect can be obtained by common connection to 32a and 32b.

As explained above, according to the present invention, even when a rotating machine such as a blower having arbitrary characteristics is combined with a fluid coupling having arbitrary torque transmission characteristics, a blower with good responsiveness and stability can be used. It becomes possible to perform automatic speed control of rotating machinery.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a rotating machine speed control device to which the present invention is applied, and FIG. 2 is a diagram showing the speed setting mechanism in FIG.
An explanatory diagram showing an example, FIG. 3 is a schematic configuration diagram showing a conventional speed governor control device used in FIG. 1, and FIG. 4 is a schematic diagram showing a preferred embodiment of the speed governor control device according to the present invention. FIG. 10... Rotating machine, 12... Constant speed rotating motor, 14... Fluid coupling, 16...
Speed governor, 18a... Acceleration control motor, 18b
...Deceleration control motor, 32a...First reduction gear, 32b...Second reduction gear, 34
a... Acceleration clutch, 34 b...
・Deceleration clutch.

Claims (1)

[Scope of utility model registration request] A governor for a fluid coupling for a rotating machine that transmits the rotational driving force of a constant speed rotating motor to the rotating machine via a fluid coupling, and controls the movement of the variable element of the governor that changes the transmission ratio of the fluid coupling by a control motor. In the control device, a first speed reducer with an adjustable reduction ratio that reduces the rotational speed of the control motor in accordance with the acceleration characteristics of the rotating machine; and an output of the first speed reducer can be freely engaged and disconnected from the adjuster. an acceleration control system including an acceleration clutch for transmitting data; a second reduction gear with an adjustable reduction ratio that reduces the rotational speed of the control motor in accordance with the reduction characteristics of the rotating machine; and a second reduction gear. and a deceleration control system equipped with a deceleration clutch that transmits output to and from the speed governor in a freely engaging and disengageable manner. A speed governor control device for a fluid coupling for a rotating machine, which is characterized by being able to perform a control action.