JPS6043185A - Engine driven refrigerating compressor - Google Patents

Abstract

PURPOSE:To use an engine at the operating point of high efficiency without applying an excessive torque to the engine and prevent respective main shafts from being applied with excessive stresses by coinciding the lower dead point of rotary shaft of the engine with the rotating angular position of the main shaft, whereat the maximum load torque of the refrigerating compressor is generated. CONSTITUTION:When an explosion occurs at the upper dead point of a piston 4 for the one cylinder reciprocating engine 1 and a torque is generated, the rotating angle of the main shaft 8 of the refrigerating compressor 7 is near 0 deg. substantially and the load torque is also small. Accordingly, inertia force is accumulated in a flywheel 2. When the piston 4 descends gradually and arrives at the lower dead point thereof, the rotating energy is being accumulating in the flywheel sufficiently and, simultaneously, the refrigerating compressor 7 approaches the maximum load torque generating time substantially, therefore, the rotating energy of the flywheel 2 is outputted to drive the refrigerating compressor 7. Accordingly, the torque to meet the load of the refrigerating compressor 7 may be outputted from the side of the flywheel 2 at all times, the fluctuation of the torque of the main shaft 8 becomes small and the stress applied to the main shaft 8 may be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a direct connection structure between an engine and a refrigeration compressor when the engine drives the refrigeration compressor.

Conventional Structure and Problems Conventionally, when a refrigeration compressor is driven for cooling or heat pump heating, the heat source is generally an electric motor. However, recently, engine-driven air-conditioning and heating systems that are promoting oil-alternative energy use and have good total efficiency in terms of secondary energy have become known.

However, in general, the engine specifications and the refrigeration compressor fil on the refrigerant circuit side! It is very difficult to match the load of 11.

If you select an engine that is larger than the load of the refrigeration compressor, you will always have to use it in an area where the engine efficiency is low; conversely, if you select a small engine, you will have problems such as the refrigeration compressor stopping abnormally or seizing up. there were. In addition, even if the engine as a drive source has a flywheel, the output torque varies per rotation per month, while the refrigeration compressor on the load side also has fluctuations in required torque per rotation, and the difference between the engine and the refrigeration compressor. Depending on the direct connection method of each main shaft, there were cases where the engine was not outputting torque even though the refrigeration compressor required a large torque. In addition, some conventional engine refrigeration compressor drive systems use belts or kunnochi, but in this case, the engine drive shaft and the refrigeration compressor load shaft may be connected randomly.
There is no problem if the engine output is sufficiently larger than the refrigeration compressor, but if you reduce the engine output to use it in a place where the engine is highly efficient, the engine may be forced to stop due to the load of the refrigeration compressor. There was a problem in that excessive stress was instantaneously applied to the drive shaft.

This problem will be explained with reference to FIG. Figure 1 shows the output torque of a single f41-cylinder Renpro engine,
It can be seen that even if explosive torque is generated at top dead center, it takes time to store it in the rotational energy of the flywheel. or,
FIG. 2 shows a load torque diagram of a rotary type refrigeration compressor, and the maximum load torque is generated around a rotation angle of 2000 degrees. Figure 3 shows the change in main shaft torque when the top dead center of the one-cylinder Lenopro engine is directly connected to the maximum load torque generation rotation angle of the refrigeration compressor, or when 1 is randomly connected. The average torque value is
However, since a large load torque is required from the refrigeration compressor before energy is stored in the flywheel, the maximum torque value Tmax has increased significantly.

OBJECTS OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, to use an engine at a highly efficient operating point without torque loss, and to avoid applying excessive stress to the main shaft of the engine and refrigeration compressor.

Structure of the Invention In order to achieve the present invention, in the drive structure of an engine-driven refrigeration compressor, the present invention aligns the bottom dead center position of the rotational shaft of the engine with the rotational angular position of the main shaft that generates the maximum load torque of the refrigeration compressor. DESCRIPTION OF EMBODIMENTS The present invention will be described below with reference to FIGS. 4 and 6 showing one embodiment thereof.

FIG. 4 is a schematic configuration diagram of the engine-driven refrigeration compressor of the present invention, and FIG. 5 shows the relationship between the main shaft torque and the main shaft rotation angle of the engine-driven refrigeration compressor of the present invention. In addition, the first
The figure shows the relationship between the output torque and the main shaft rotation angle of a single cylinder reciprocating engine, and the figure 2 shows the relationship between the load torque and the main shaft rotation angle of a rotary refrigeration compressor as an example. Figure 3 shows the relationship between the main shaft torque and the main shaft rotation angle when the engine and refrigeration compressor are directly connected in a conventional or random manner.

In FIG. 4, 1 is a one-cylinder reciprocating engine, 2 is a flywheel connected to the main shaft 3, 4 is a piston connected to the crank part 5 of the main shaft 3, and 6 is a starter motor for starting the one-cylinder reciprocating engine 1. It is. 7 is a refrigeration compressor, and the main shaft 8 of the refrigeration compressor 7 is a cup link 9.
It is directly connected to the main shaft 3 of the one-cylinder Renbro engine 1 via.

10 is a piston of the refrigeration compressor 7. In particular, the rotation angle of the piston 10 when the maximum load torque of the refrigeration compressor is generated (in this case, about 20Q0 from the start of compression at the piston 1o position) and the position of the piston 4 of the one-cylinder Renpro engine 1 are The main shaft 8 of the refrigeration compressor 7 and the main shaft 3 of the Renpro engine 1 are directly connected so as to be at the dead center.

In the above configuration, the one-cylinder reciprocating engine 1 is started by the starting motor 6, the piston 4 is pushed down by explosive combustion, the main shaft 3 is driven by the rotation of the crank part 5, rotational energy is given to the flywheel 2, and the compulsion is started. Power is transmitted to the main shaft 8 of the refrigeration compressor 7 via the refrigeration compressor 9 to rotate the piston 10 and compress the refrigerant (not shown).

Fig. 5 shows the torque fluctuation of the main shaft 8 of the refrigeration compressor 7 with the above configuration. When the piston 4 of the one-cylinder reciprocating engine 1 explodes from the top dead center position and generates torque, The rotation angle of the main shaft 8 of 7 is around 00,
Load torque is also low.

Therefore, rotational energy (inertia force) is stored in the flywheel 2. When the piston 4 gradually descends and reaches the bottom dead center position, sufficient rotational energy has been stored in the flywheel 2, and at the same time, the refrigeration compressor 7 is nearing the time when the maximum load torque is generated, and the rotation of the flywheel 2 is stopped. Energy (
(inertial force) to drive the refrigeration compressor 7. Therefore, the torque commensurate with the load of the refrigeration compressor 7 can always be output from the flywheel 2 side, and the torque fluctuation of the main shaft 8 is small as shown in FIG. When compared with Figure 3, which shows the case of the coupling method, the average torque is the same, but the maximum load torque is
ax can be smaller than Tma.As a result, not only is it possible to use the one-cylinder reciprocating engine 1 in a more efficient manner, but the stress on the main shaft 8 is also reduced, resulting in strength design. Effect of the Invention As is clear from the above invention, according to the present invention, the main shaft torque of the engine increases prior to the increase in the load torque of the refrigeration compressor, thereby reducing the rotational inertia of the flywheel. Since the rotational speed of the main shaft of the refrigeration compressor is increased, there is no sudden decrease in the rotational angular velocity of the main shaft of the refrigeration compressor, and
In the process of decreasing the load fluctuation torque, the flywheel inertia of the engine also decreases, and the main shaft of the refrigeration compressor does not accelerate. Therefore, the torque of both the refrigeration compressor and the engine is
Fluctuations in the rotational speed of the spindle are small, which is very effective in terms of noise and vibration. In addition, since the torque fluctuation is small, there is little mechanical loss on bearings and piston sliding surfaces, allowing the engine to be used efficiently, and at the same time, the stress on the main shaft is small, which is very advantageous in increasing strength. It has great effects such as totoru.

[Brief explanation of the drawing]

Figure 1 is a diagram of output torque fluctuation of a one-cylinder reciprocating engine.
Figure 2 is a load torque fluctuation diagram of a refrigeration compressor, and Figure 3 is the main shaft of a conventional engine-driven refrigeration compressor!・Luku fluctuation diagram, 4th
The figure is a sectional view of an engine-driven refrigeration compressor showing an embodiment of the present invention, and FIG. 5 is a main shaft torque fluctuation diagram of the engine-driven refrigeration compressor. 1...1 cylinder Regigeron carrot, 2...flywheel, 3, 8...main shaft, 9...
cup link. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure - F axis rotation angle 2 seats. Figure 2: Mibeon l111 Figure: Turning Kadoya Figure 3: How many angles of Jinbei Figure 5: Main axis How many turning angles

Claims (1)

[Claims] (1) A one-cylinder reciprocating engine with a flywheel connected to the main shaft is connected via a compression ring, and the rotation angle of the main shaft that generates the maximum load torque of the refrigeration compressor is set so that the one-cylinder reciprocating engine is at the bottom dead center position. An engine-driven refrigeration compressor in which the main shaft of the one-cylinder reciprocating engine and the main shaft of the refrigeration compressor are directly connected via the coupling.