JPS5870074A - Engine driven compressor - Google Patents

Abstract

PURPOSE:To enhance reliability of operation of an engine driven compressor, by coupling an engine and a compressor together by feeding current to a clutch when the engine speed is raised to a prescribed high level, and thereby starting the compressor from a low speed. CONSTITUTION:When starting of an engine 1 is completed, a starter 5 is detached from a turning shaft 2 of the engine 1. Subsequently, when the engine speed is raised to a proper level, a turning shaft 10 of a compressor 9 and the turning shaft 2 of the engine 1 are coupled together by a clutch 12. Here, since the engine speed at the time can be selected at a sufficiently low value, the speed of rotation of the compressor 9 at the time of starting can be kept sufficiently low. Therefore, the compressor 9 can be started without causing drastic speed change, so that the reliability of operation of the engine driven compressor can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine-driven compressor that is driven by an engine via a clutch, and aims to facilitate engine start-up and improve the reliability of the compressor. It is something.

In conventional engine-driven compressors, the engine's rotating shaft is directly connected to the compressor's rotating shaft via a flexible joint, so when the compressor is stopped and started, the pressure is There was a pressure difference between the sides, and it was necessary to overcome this pressure/difference to start the engine.

This had the disadvantage that the engine starting device became larger. In addition, some models have a clutch installed between the engine and the compressor, but the clutch is turned ON and OFF regardless of the engine speed, especially when the clutch is ONL and the engine rotation speed is high. The compressor rotated rapidly at high speeds, and without sufficient lubricating oil being supplied to sliding parts such as bearings, the load increased rapidly and there was a risk of seizure.

The present invention eliminates the above-mentioned conventional drawbacks, and FIG. 1 shows an embodiment of the engine-driven compressor of the present invention, and FIG.
The figure shows an embodiment of the control circuit. In Figure 1,
1 is an engine, and a flywheel 3 made of gears is connected to its rotating shaft 2. This flywheel 3
A starting device having a gear 4 is coupled to the
A transmission mechanism 6 is provided on the same axis as the rotation shaft 2, and the transmission mechanism 6 is further coupled to a rotation shaft 1o of a compressor 9 having a refrigerant suction pipe 7 and a discharge front 8.

The transmission mechanism 6 is composed of a flexible joint 11 and a clutch 12, and the flexible joint 1
1. It is sequentially connected to the clutch 12 and transmits rotational force to the rotating shaft 10 of the rL1 compressor 9. The flexible joint 11 transmits rotational force through an elastic body 13 such as rubber in order to absorb the axial deviation of the rotating shaft 2 of the engine 1.

The clutch 12 is connected to a rotating body 14 coupled to the flexible joint 11 and a rotating shaft 10 of the compressor 9, and is composed of a second rotating body 15 and a coil 16.
By energizing, the rotating body 14 and the second rotating body 15 come into close contact with each other on the sliding surface 17 and transmit the rotational force from the flexible joint 11 to the rotating shaft 10.

Next, explaining the control circuit shown in FIG. 2, the coil 16 constituting the clutch 12 and the motor 18 constituting the starting device 6 are connected to an engine control device 19 and a rotation detection device 2o that detects the rotation of the engine 1. The configuration is such that it is controlled by a startup control device 21 that receives a signal. The engine control device 19 controls the engine rotation speed by controlling the fuel supply to the engine 1, starts and stops the engine 1, and performs fill rllllll. The simultaneous rotational speed of the engine 1 is controlled when a signal for starting the engine 1 and the compressor 9 is input to the engine control device 19 by a detection/controller (not shown) such as a temperature regulator (not shown). The engine control device 19 starts supplying fuel to the engine 1, and at the same time, an operation signal is input to the startup control device 21. This signal causes the activation control device 21
energizes the motor 18. Further, the rotation detection device 20 detects the rotation speed of the rotation shaft 2 of the engine 1 using a magnetic or optical method, and outputs an output corresponding to the rotation speed to the startup control device 21.

FIG. 3 shows a characteristic diagram of the control circuit, in which the horizontal axis represents the engine 10 rotational speed and the vertical axis represents the compressor 90 rotational speed. As described above, when the driving signal from the engine control device 19 is input to the starting bag side filling device 21, the motor 18 is energized, the starting device 5 is activated, and the flywheel 3 is rotated by the gear 4. As a result, if the fuel inside the engine 1 is ignited, the engine 1 starts. The starting control device 21 detects, based on a signal from the rotation detection device 21, that this rotational speed has increased and the inertia force that allows the flywheel 3 to continue rotating has reached the rotational speed ■1, and the motor 1 is activated. Turn off the power to +)-.

As a result, the gear 4 of the starting device 6 is disengaged from the flywheel 3. When the rotational speed of the engine 1 further increases from this rotational speed VO and reaches the rotational speed ■1 of point A, the starting control device 21 receives this signal from the rotation detection device 20.
energizes the coil 16 and activates the multi-channel chi 12 to connect the engine 10 rotating shaft 2 and the compressor 9 rotating shaft 1o,
The compressor 9 rotates at the same rotational speed v1 as the engine 1, and startup begins. This point is the tip. After this, the rotation of the engine 1 is controlled by the engine control device 19,
Correspondingly, the rotational speed of the compressor 9 also changes on a one-to-one basis and is controlled up to point C. Conversely, the engine control device 19
When the rotational speed of the engine 1 is lower than the point, that is, the engine rotational speed decreases to point 2 of v2 below vl, the starting control device 21 receives this rotational speed signal from the rotation detection device 20 and sends it to the coil 16. energization is stopped to disconnect the rotation shaft 2 of the engine 10 and the rotation shaft 1o of the compressor 9, thereby preventing the operation of the engine 1 from becoming unstable. Furthermore, when the rotational speed of the engine 1 drops below v2 above, whether to continue operating the engine 1 in an idling state or to stop the engine 1 is determined by the specifications of the engine and drive compressor system. good. In Figure 3, the engine speed VO is ■2
It is a lower value, but a value higher than ■2 is also acceptable.
It is sufficient to take a value lower than at least ■1. However, if a control method is adopted in which the motor 18 is automatically energized by the start control device 21 when the rotation speed of the engine 1 decreases to the value v3, the engine rotation speed ■3 must be It is necessary to set the value to v2 or lower. This is to prevent the motor 18 from being energized and the starting device 5 to be activated before the coil 16 of the clutch 12 is de-energized when the engine speed decreases.

By controlling the engine-driven compressor as described above, the engine 1 can be easily started ΦJ1 without being subjected to the load of the compressor 9, and the engine 1 can be started using a small starting device 5. Can be done. , and when the starting of the engine 1 is completed, the starting device 5 is disconnected from the rotating shaft 2 of the engine 1, and the appropriate engine speed is reached, the clutch 1 is turned off.
2 is inserted, and the rotating shaft 1o of the compressor 9 and the rotating shaft 2 of the engine 1 are coupled. Since the rotational speed of the engine 1 at this time can be set to a sufficiently low value, the rotational speed at startup of the compressor 9 is sufficiently low, and the compressor 9 can be operated without causing sudden changes in rotational speed. It is possible to start the operation without applying a sudden load to the sliding parts such as the bearings of the compressor 9, and since the rotational speed of the compressor 9 is still low, it is possible to start the operation without causing liquid compression inside the compressor. , it is possible to provide a highly reliable engine-driven compressor.

As is clear from the above description, the engine-driven compressor of the present invention includes an engine, a compressor driven by the engine via a recliner, a starting device that starts the engine, and a rotational speed of the engine that detects the rotational speed of the engine. A rotation detection device receives a signal of the engine rotation speed from this rotation detection device, and when the rotation speed reaches an appropriate rotation speed V○ for engine startup, the operation of the starting device is stopped, and the engine rotation speed is increased to a predetermined rotation speed higher than this rotation speed Vo. When the speed v1 is reached, the clutch is energized to connect the engine and the compressor, and this rotational speed v
The rotational speed V2 (V
2<Vl), the engine is equipped with a start control device that stops energizing the clutch, and a small and inexpensive engine start device can be used, and the compressor can be started from low speed rotation. A highly reliable engine-driven compressor can be provided.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway sectional view showing an embodiment of an engine-driven compressor of the present invention, FIG. 2 is a block diagram of a control circuit of the compressor, and FIG. 3 is a characteristic diagram of the control circuit. 1...engine, 5...starting device, 9.
...Compressor, 12...Clutch, 2o...
... Rotation detection device, 21 ... Start control device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3

Claims (1)

[Claims] An engine, a compressor driven by the engine via a clutch, a starting device for starting the engine, a rotation detection device for detecting the rotational speed of the engine, and an engine driven by the rotation detection device. When the rotational speed signal is received, the engine waits for the engine to start, and when the rotational speed reaches a predetermined rotational speed vO, the operation of the starter is stopped, and when the rotational speed reaches a predetermined rotational speed v1 higher than the rotational speed vO, the clutch is energized. An engine-driven compressor which combines an engine and a compressor and has a predetermined f steresis with respect to the rotational speed V1 and is provided with a startup control device that stops energizing the clutch when V2<V. .