JPH0513962Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a mechanical governor for a generator-driving engine, and in particular, to a mechanical governor for a generator-driving engine that can switch the power generation frequency between two types of commercial frequencies. Regarding the governor.

<<Prior Art>> As is well known, AC electrical equipment uses frequencies of, for example, 50 Hz and 60 Hz. Therefore, engine generators are also available in which the power generation frequency can be switched between two different operating frequencies (50Hz and 60Hz).

In the engine generator, the power generation frequency of the generator is changed by changing the set rotational speed of the engine. Furthermore, the generator-driving engine is equipped with a mechanical governor to enable the engine to operate at a constant rotation speed.

In this mechanical governor, a governor weight is attached to the engine crankshaft or a rotating shaft linked to the engine crankshaft, and the centrifugal force generated in the governor weight is proportional to the engine rotational speed. The power is transmitted to the fuel metering device such as the control rack and throttle valve in the metering supply device, and the governor spring is assembled to the governor lever so that its spring force acts in the opposite direction to the operating force of the fuel metering device by the governor weight. The target rotation speed is set by adjusting the governor spring force by operating the speed control lever, and the fuel supply amount is controlled by balancing the governor spring force with the centrifugal force of the governor weight, regardless of load fluctuations. It is designed to keep the rotation speed constant.

<Problem to be Solved> In this case, the centrifugal force acting on the governor weight is a force that changes in a quadratic function, whereas the governor spring force is a force that changes in a linear function. With a mechanical governor, for example, 50Hz with the engine speed set to 1500r.pm.
When used by switching between the power generation state and the 60Hz power generation state set at 1800r.pm, the difference in engine speed to generate the differential force enough to move the governor lever by a certain amount will be the same as the 50Hz power generation speed range and the 60Hz power generation state.
There is a big difference between the power generation rotation range and the rotation range for power generation. As a result, if the governor spring force is set based on the low commercial frequency (50Hz) power generation state, in the high commercial frequency (60Hz) power generation state, the governor lever will move even if there is a slight difference in rotation speed, and the fuel control The sensitivity of the operation becomes too high, resulting in repeated hunting. Conversely, if you set the governor spring force based on the 60Hz power generation state, the governor lever will not move unless there is a large rotation speed difference in the 50Hz power generation state, the sensitivity of the fuel control operation will become dull, the governor difference will become large, and the power generation will decrease. The rotational speed of the machine will fluctuate greatly.

As a result, in engines equipped with conventional mechanical governors, it is not possible to accurately adjust the power generation frequency simply by changing the engine speed.
When switching the power generation frequency, work such as replacing the governor spring is required, which poses a problem in that the switching work becomes troublesome.

The present invention can be easily switched between generating power at a lower commercial frequency and generating power at a higher commercial frequency, and provides stable frequency power in either power generation state. The purpose of the present invention is to provide a mechanical governor for driving a generator that can be used to drive a generator.

<Means for Solving the Problems> In order to achieve the above object, the present invention connects a governor difference correction operating tool to the governor lever via a governor difference correction spring, and adjusts the governor difference correction operating tool to the correction position. In the correction state in which the governor difference correction operating tool is located at the correction position, the governor difference correction spring presses the governor lever toward the fuel increase side, while the governor difference correction operating tool is In the correction release state, which is located at the correction release position, the governor difference correction spring is configured so as not to press the governor lever, and the governor difference correction operating tool is moved to the correction position by the correction position stopper and to the correction release position by the correction release position stopper. The present invention is characterized in that it is configured so that it can be received, and that it is configured to switch and press from the unstable switching point to a correction position and a correction release position using an unstable switching spring.

<<Operation>> In the present invention, a governor difference correction operating tool is connected to the governor lever via a governor difference correction spring, and the governor difference correction operating tool is configured to be switchable between a correction position and a correction release position. In the correction state where the operating tool is located at the correction position, the governor difference correction spring presses the governor lever toward the fuel increase side, whereas in the correction release state where the governor difference correction operating tool is located at the correction release position, the governor difference correction spring presses the governor lever toward the fuel increase side. Since the correction spring is configured not to press the governor lever, the governor spring force can be adjusted by the speed governor lever and the governor difference correction spring force can be adjusted independently by the governor difference correction operating tool. As a result, the spring force acting on the governor lever can be adjusted and changed between the state where the governor lever is set at the low speed rotation setting position and the state where the governor lever is set at the high speed rotation setting position, thereby equalizing the governor difference in each rotation range. become.

Furthermore, the governor difference correction operating tool is configured to be able to be received at the correction position by the correction position stopper and at the correction release position by the correction release position stopper, and from the unstable switching point to the correction position and the correction release position by the unstable switching spring. Since the governor difference correction operating tool is selectively switched between the correction position and the correction release position, the governor difference correction operating tool must be securely held in each position. I can keep it.

《Example》 The drawings show an example of the present invention, in which Figure 1 is a plan view of the main parts, Figure 2 is a longitudinal side view showing the governor mechanism,
Figure 3 is a perspective view of the main parts of the governor mechanism;
The figure is a longitudinal sectional view of the engine generator.

This engine generator 1 has a structure in which an alternating current generator 3 and a diesel engine 4 that drives the alternating current generator 3 are arranged in series within a soundproof case 2, and the input shaft of the alternating current generator 3 is directly connected to the output shaft of the engine 4. ing.

The mechanical governor M incorporated in this engine 4 controls the amount of fuel supplied from the fuel injection pump 5 according to the engine rotation speed, and is attached to a pump drive shaft 6 for driving the fuel injection pump 5. The fuel injection pump 5 has a governor weight 7 and a governor lever 10 for transmitting the thrust force (governor force) G in the axial direction due to the centrifugal force F generated in the governor weight 7 to the control rack 8 of the fuel injection pump 5. There is.

The governor lever 10 is composed of a fork lever 11 engaged with the control rack 8 and a spring lever 13 to which one end of the governor spring 12 is engaged. By receiving one end edge of the spring lever 13 with an interlocking pin 14 extending from the spring lever 11, the spring lever 13 is operated in an interlocking manner. Further, the other end of the governor spring 12 is engaged with an inner arm 16 of a speed regulating lever 15.

The speed regulating lever 15 has a connecting shaft portion 17 connected to the cylinder shaft 1.
It is supported by the governor case 19 via 8,
An operating arm 20 is fixed to an end of the connecting shaft portion 17 located outside the governor case 19. In addition, cylinder shaft 1
An operating arm 21 is formed at the inner end of the lever 8, and a governor difference correction spring 22 is mounted between the operating arm 21 and the fork lever 11. An operating arm 23 is formed at the outer end of the barrel shaft 18, and the operating arm 21/operating arm 23 formed inside and outside the barrel shaft 18 and the barrel shaft 18 form a governor difference correction operating tool 24. . Note that the governor difference correction spring locking portion 2 of the fork lever 11
Reference numeral 5 is formed as a long hole having a long axis in the governor lever swinging direction, and prevents the spring force of the governor difference correction spring 22 from acting on the fork lever 11 when the governor difference correction operating tool 24 is not operated. .

The speed regulating lever 15 connected to the spring lever 13 is at a high-speed rotation setting position H where the engine rotation speed is set to a rotation speed (for example, 1800 r.pm) at which a power generation frequency of 60 Hz is obtained, and a power generation frequency of 50 Hz is obtained. It is configured to be switchable between a low speed rotation setting position L, which sets the rotation speed (for example, 1500 rpm), and is received by lever receiving bolts 29 and 30 at each setting position H and L.

On the other hand, the governor difference correction operating tool 24 is configured to be switchable between a correction position D and a correction release position R.
1 and 32, respectively. Further, this governor difference correction operating tool 24 is elastically biased by an unstable switching spring 33 using a torsion coil spring, and elastically biases each receiving tool 31, 32 with the unstable switching switching point N as a boundary. This allows it to be stably supported at each position D, R.

FIG. 5 shows a modification of the structure for stably supporting the governor difference correction operating tool 24 in the correction position D and the correction release position R. A portion is formed on the cam surface 34, and a leaf spring 35 is brought into elastic contact with the cam surface 34 to elastically bias the governor difference correction operating tool 24 toward the correction position D and the correction release position R. be.

FIG. 6 shows a modification of the mechanism for stably supporting the governor difference correction operating tool 24 at the correction position D and the correction release position R. Recessed holes 37 are formed at locations corresponding to the correction position D and correction release position R of the difference correction operating tool 24, and a ball 40 that is biased downward by a spring material 39 is held in the governor difference correction operating tool 24. By selectively fitting the ball 40 into the recessed hole 37, the governor difference correction operating tool 24 is moved to the correction position D.
and the correction release position R.

In the mechanical governor for a generator-driving engine having the above-described configuration, when the governor lever 15 is set to the high-speed rotation setting position H and the governor difference correction operating tool 24 is set to the correction position D, the governor lever 10
A resultant force S of the tension of the governor spring 12 and the tension of the governor difference correction spring 22 acts on this, and balances the governor force G. On the other hand, speed regulating lever 1
5 to the low speed rotation setting position L, and the governor difference correction operating tool 24 to the correction release position R.
Fork lever 1 of governor difference correction spring 22
Since the end on the 1 side moves freely inside the governor difference correction spring locking part 25 formed by an elongated hole, the tension of the governor difference correction spring 22 becomes zero, and the resultant force S acting on the governor lever 12 is Only the tension of the governor spring 12 acts.

In the above embodiment, the governor difference correction spring 22
Although the fork lever 11 is locked to the fork lever 11, the spring lever 13 may be locked to the spring lever 13. Further, the present invention can be applied not only to a two-lever type mechanical governor but also to a single-lever type mechanical governor.

<<Effects>> In the present invention, a governor difference correction operating tool is connected to the governor lever via a governor difference correction spring, and the governor difference correction operating tool is configured to be switchable between a correction position and a correction release position. In the correction state where the operating tool is located at the correction position, the governor difference correction spring presses the governor lever toward the fuel increase side, whereas in the correction release state where the governor difference correction operating tool is located at the correction release position, the governor difference correction spring presses the governor lever toward the fuel increase side. Since the correction spring is configured not to press the governor lever, the governor spring force can be adjusted by the speed governor lever and the governor difference correction spring force can be adjusted independently by the governor difference correction operating tool. As a result, the spring force acting on the governor lever can be adjusted and changed between the state where the governor lever is set at the low speed rotation setting position and the state where it is set at the high speed rotation setting position to equalize the governor difference in each rotation range. Therefore, it is possible to obtain a frequency-switchable generator-driving engine with little fluctuation in the power generation frequency.

Furthermore, the governor difference correction operating tool is configured to be able to be received at the correction position by the correction position stopper and at the correction release position by the correction release position stopper, and from the unstable switching point to the correction position and the correction release position by the unstable switching spring. Since the governor difference correction operating tool is selectively switched between the correction position and the correction release position, the governor difference correction operating tool must be securely held in each position. The engine speed can be controlled with high accuracy at different engine speeds.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being a plan view of the main parts, and FIG. 2 being a longitudinal side view showing the governor mechanism.
Figure 3 is a perspective view of the main parts of the governor mechanism;
5 is a plan view of a main part of another embodiment, and FIG. 6 is a sectional view of a main part showing a modified example of a receiving device for receiving a governor difference corrector. 3... Generator, 4... Engine, 5... Fuel metering supply device, 7... Governor weight, 8... Measuring tool of 5, 10... Governor lever, 12... Governor spring, 15... Speed governor Lever, 22... Governor difference correction spring, 24... Governor difference correction operating tool, 31... Correction position stopper, 32... Correction release position stopper, 33... Unstable switching spring,
M...Mechanical governor, L...Rotation setting position for low Hz power generation, H...Rotation setting position for high Hz power generation, D...
...Correction position, R...Correction release position, N...Unstable switching point.

Claims (1)

[Claims for Utility Model Registration] A mechanical governor M is assembled to an engine 4 that is interlocked with the rotating shaft of a generator 3, and a governor spring 12 and a governor weight 7 of the mechanical governor M are used to adjust fuel via a governor lever 10. The metering tool 8 of the quantity supply device 5 is connected in conjunction with the metering tool 8, and the governor spring 12 presses the metering tool 8 toward the fuel increase side, and the governor weight 7 presses the metering tool 8 toward the fuel decrease side. 8 is configured to move in a controlled manner, and the governor spring 12 is connected to the speed regulating lever 15 so that the tension can be adjusted.
Move the speed regulating lever 15 to the low Hz power generation rotation setting position L and high.
In a mechanical governor for a generator driving engine that is configured to be switchable between a rotation setting position H for Hz power generation, a governor difference correction spring 2 is attached to a governor lever 10.
2, the governor difference correction operating tool 24 is configured to be switchable between a correction position D and a correction release position R, and the governor difference correction operating tool 24 is set to the correction position D. In the correction state in which the governor difference correction spring 22 is positioned, the governor difference correction spring 22 presses the governor lever 10 toward the fuel increase side, whereas in the correction release state in which the governor difference correction operating tool 24 is located in the correction release position R, the governor difference correction spring 22 presses the governor lever 10 toward the fuel increase side. 22
configured so that the governor lever 10 is not compressed,
Move the governor difference correction operating tool 24 to the correction position stopper 3
1 to the correction position D, the correction release position stopper 32
The power generation device is characterized in that it is configured such that it can be received at the correction release position R, and is configured to switch from the unstable switching point N to the correction position D and the correction release position R using an unstable switching spring 33 to apply pressure. Mechanical governor for machine drive engine.