JPS6132112Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a diesel engine that uses a mixture of different fuels, and in particular, attempts to control the mixing ratio for the purpose of preventing staining and wear due to the use of heavy oil. This relates to diesel engines that use mixed oil.

[Conventional technology and its problems]

Diesel engines that use a mixture of heavy oil (also called low quality oil or inferior quality oil) and light oil have been known for some time, and the mixing ratio is particularly dependent on temperature, engine condition, and heavy oil. It is determined by the quality of oil, etc., or by the engine load factor because of the characteristic that even heavy oil burns well when the engine is under high load. (Refer to Utility Model Application Publication No. 57-73366).

However, using heavy oil with these mixing ratios increases engine fouling and wear, leading to early deterioration of the lubricating oil, making it necessary to disassemble the engine, replace the cylinder liner, and replenish the lubricating oil. costs are increasing.

[Means for solving problems]

Therefore, the present invention aims to reduce engine operating costs by using heavy oil while also avoiding the staining and wear of the engine due to the use of heavy oil.
That is, the aim is to limit the mixing ratio of heavy oil to avoid engine fouling and wear.

Hereinafter, the configuration of the present invention will be explained in detail using examples.

In the system diagram shown in Fig. 1, first, to explain the outline of the embodiment, a service tank 1 containing heavy oil (C heavy oil) and a service tank 2 containing light oil (A heavy oil) are installed side by side. , the service tank 1 and the heavy oil pump 3 are communicated with the service tank 2 and the light oil pump 4, respectively, and the oil is fed into the mixer 5 by these pumps 3 and 4. The mixed oil exiting the mixer 5 is stored in an accumulator 6 and supplied to the fuel pump of the engine 7.

Here, a heater is inserted into the service tank 1 to lower the viscosity of the heavy oil and improve its fluidity.

The heavy oil pump 3 and the light oil pump 4 are directly connected via a continuously variable transmission 8, and the light oil pump 4 is driven by a DC motor 9. Therefore, the DC motor 9
By changing the rotation speed of the pumps 3 and 4, the total discharge amount of each pump 3 and 4 can be changed. Furthermore, by changing the gear ratio of the continuously variable transmission 8, the discharge amount of each pump 3, 4 can be changed, and the mixing ratio of heavy oil and light oil can be changed.

Although the mixer 5 is not shown in detail, it has a tubular shape, and two types of left and right spiral thin plates are partially overlapped and arranged in series in the tube, and the mixer 5 is made up of two types of spiral thin plates that are partially overlapped in a left and right direction. By meandering the heavy oil and light oil, continuous mixing is achieved.

As described above, the accumulator 6 stores the mixed oil and measures the pressure inside the accumulator 6 as a sensor, and detects the pressure in the DC motor 9 due to a decrease in pressure, that is, an increase in the amount of use of the engine 7. control to increase the rotation of the engine and draw out heavy oil from each service tank 1 and 2.

Note that the mixing ratio of heavy oil and light oil may be changed by changing the opening degree of the electromagnetic valve or the combination of the orifice and the valve.

The above-mentioned in-line blending system is already being sold as a product by the present applicant, but the inventor of the present invention has adjusted the mixing ratio in this system with the main purpose of avoiding staining and abrasion caused by impurities in the mixed oil. They attempted to control the amount based on the fact that the amount is the limit of the mixing ratio of the mixed oil.

That is, since the load and the exhaust temperature approximately correspond to each other, the exhaust temperature sensor 11 is inserted into the exhaust pipe 10, the detected exhaust temperature is detected by the detector 12, and electrically converted. and ratio detector 1
4, the control circuit 13 is controlled by the control circuit 13, and the operation section 15 of the continuously variable transmission 8 is controlled by the control circuit 13. As shown in Figure 2, the control is to increase the proportion of light oil in the mixed oil at low loads (1/4) and high loads (4/4), and to increase the proportion of light oil in the mixed oil at intermediate loads. Operate with a relatively large amount of heavy oil.

The illustration shows that the dashed line in FIG. 2 is the first control example, and the dotted line is the second control example.

By the way, the exhaust temperature curve in Figure 2 looks like a solid line, and when the load is low, the exhaust temperature is low and
The sulfur content in heavy oil becomes SO ₃ and pseudo-condenses on the inner surface of the cylinder in liquid form, causing corrosive wear, but this phenomenon is especially severe in heavy oil as it has a high sulfur content. Also, under high loads, vanadium in heavy oil corrodes exhaust valves and other parts.

However, in the present invention, as mentioned above, when the load is low, the proportion of light oil is large and the proportion of heavy oil is small, so corrosive wear can be prevented, and the same is true when the load is high.
It is possible to avoid damage caused by the use of heavy oil.

[Effect of idea]

In summary, since the present invention adopts the structure described in the claims for utility model registration, it has the following effects.

At low and high loads, a large amount of light oil is used to secure the calorific value and fuel consumption rate is low, especially at high loads, and at medium loads, a large amount of low quality fuel is used to reduce fuel costs. Overall, the engine can be operated economically.

At low loads, less heavy oil is used,
Prevents corrosive wear caused by sulfur substances, prevents corrosive wear caused by vanadium under high loads, avoids harmful effects caused by the use of heavy oil, and in particular extends cylinder liner replacement and lubricating oil replacement. can.

Sulfur compounds are generated when the load is low, that is, when the exhaust temperature is low, whereas vanadium has a negative effect when the load is high.On the other hand, we specifically selected the exhaust temperature sensor as the detection sensor, and investigated the above phenomenon and the exhaust temperature sensor. Since they are directly connected, the mixing ratio can be adjusted appropriately to avoid damage caused by the use of heavy oil. In other words, the detection sensor can accurately correspond to the purpose of preventing the harmful effects of using heavy oil.

Cadmium salts etc. as corrosion inhibitors act on vanadium and sulfur compounds,
Although there are non-hazardous means to prevent corrosion, the present invention does not specifically require such corrosion inhibitors.

[Brief explanation of the drawing]

FIG. 1 shows an overall system diagram, and FIG. 2 shows a control pattern diagram. 1, 2... Service tank, 7... Engine, 8...
...Continuously variable transmission, 11...Exhaust temperature sensor, 14
...control circuit.

Claims (1)

[Scope of utility model registration request] A heavy oil service tank and a light oil service tank installed in parallel, controllable pumps attached to these tanks, a mixer that communicates with the discharge side of these pumps, a diesel engine to which mixed oil is supplied from the mixer, In the in-line blending system, an exhaust temperature sensor is installed on the exhaust side of the engine to detect the temperature of the engine from low load to high load. A diesel engine that uses a mixed oil to prevent staining and wear, which allows the rotation of each of the pumps to be controlled so as to prevent dirt and wear.