JPS6113739Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fuel oil transfer device for a ship engine.

As is well known, as the oil situation worsens, we are forced to use low-quality heavy oil as fuel oil for ship engines, but these low-quality heavy oils have a low viscosity at room temperature.
Since it exceeds 1000 cst, it cannot normally be supplied to the engine, so the oil temperature in the fuel oil tank is increased by heating means, that is, the oil temperature is increased and the viscosity is lowered, and the oil is sucked in and discharged by a pump. In addition, to prevent heat loss when passing through the suction and discharge piping system, and to prevent residual oil remaining in the piping system before starting the pump (Note: To shorten the suction time, a check valve is used to prevent the oil column from running out. ) from heating, etc.
The heating device for the piping system was indispensable.

A typical example of the conventional device is as shown in FIG. That is, in the same figure, a is a fuel oil tank, b is a fuel oil pump, c is a settling tank, d is a suction pipe having a valve _d1 and a strainer _d2 that connect the fuel oil tank a and the fuel oil pump b,
e is a discharge pipe having a valve _e1 connecting fuel oil pump b and settling tank c, f is a pump room, g is an engine room, h is a lubricating oil tank, and fuel oil tank a is connected to the bottom plate i. A number of heating valves (j) using steam or hot water were mounted horizontally on the top and inside, and heating devices (not shown) were provided in the suction pipe (d) and the discharge pipe (e). That is, especially in cold sea areas, the heating valve j is provided to prevent the cst of fuel oil passing through the bottom plate i from further increasing and to increase the oil temperature, and the A piping system heating device was provided to prevent heat loss when the fuel oil passes through the pipe e and to heat the residual oil remaining before starting the fuel oil pump b.

However, in conventional equipment that requires a heating device in the piping system, the fuel oil pump is usually installed at a higher location than the fuel oil tank a, and the valve d ₁ and strainer d are installed midway. ₂
The length of the suction pipe becomes considerably longer due to the presence of
Therefore, the fluid loss in the oil head pipe due to the head is added,
Since the temperature often exceeds 1000cst, it is necessary to constantly heat the product at a corresponding temperature, which has the disadvantage of requiring a large amount of initial cost, running cost, and maintenance cost. It was hot.

This idea was created by focusing on the points mentioned above.
The purpose is to eliminate the need for heating devices for the fuel oil suction pipe and discharge pipe system, resulting in resource and energy savings.In other words, the fuel oil in marine engines can be significantly reduced in costs compared to conventional devices. To provide a transfer device.

Next, an embodiment of the present invention capable of achieving the above object will be described in detail with reference to FIG.

In the figure, 1 is a fuel oil tank, 2 is a fuel oil pump, 3 is a settling tank, 4 is a suction pipe connecting the fuel oil tank 1 and the fuel oil pump 2, and 5 is the fuel oil pump 2 and the settling tank 3. 6 is a pump room, 7 is an engine room where the engine 7a is installed, 8 is a lubricating oil tank, and fuel oil tank 1
is provided on the bottom plate 9, and a number of heating valves 10 using steam or hot water are installed horizontally inside. The suction pipe 4 is provided with a fuel oil supply valve 4a and a strainer 4b, and an air suction pipe 11 having an air supply valve 11a is connected between the fuel oil supply valve 4a and the strainer 4b. Furthermore, as the pump device, a positive displacement rotary type external bearing pump (for example, a gear pump, a twin screw pump, etc.) is used.

Furthermore, although not shown, the settling tank 3 is provided with a liquid level detection device for detecting the lower and upper limits of the liquid level and a signal generating device for the detected liquid level, and the suction pipe 4 is and discharge pipe 5
It is configured to push the residual oil inside into the settling tank 3 with air.

In the configuration described above, when the liquid level in the settling tank 3 reaches the lower limit, the fuel oil pump 2 is activated by the lower limit signal from the detection device, and when it reaches the upper limit position, the fuel oil supply valve 4a is closed by the upper limit signal. , the suction pressure of the fuel oil pump 2 is detected, and the air supply valve 11a is opened in response to a pressure signal when the set degree of vacuum is reached.

Then, outside air is sucked in through the air supply valve 11a, and the remaining oil in the suction pipe 4 and discharge pipe 5 is pushed by air and sent into the settling tank 3.

The discharge pressure of the fuel oil pump 2 is detected, and air pressure is continued until it falls below the set value (the discharge pressure at which residual oil is removed by air pressure), and the suction and discharge piping systems are dredged. .

Then, the fuel oil pump 2 is activated by the pressure signal at the time when the discharge pressure of the fuel oil pump 2 becomes lower than the set value.
stops, and the air supply valve 11a closes,
The fuel oil supply valve 4a opens.

One embodiment of the present invention has been described above, but
The present invention is not limited to this, and the design may be modified as follows.

() Temperature sensors may be provided on the pump bearing and rotating body, that is, the pump may be configured to obtain fuel oil intake/discharge and air intake while maintaining safe operation.

() An abnormality signal transmitter may be added to control the drive of various devices.

Since the present invention is constructed as described above, the remaining oil in the suction pipe and the discharge pipe can be sent into the settling tank each time fuel oil is taken in and discharged, thereby making the inside of the suction pipe and the discharge pipe empty. Since there is no residual oil in the piping system, it is possible to avoid the situation where residual fuel oil becomes highly viscous or solidifies as the temperature drops, which is the case with conventional systems, resulting in the inability to inhale upon restart. This eliminates the need for a heating device for the oil piping system, resulting in resource and energy savings, and is also suitable for unmanned operation of the engine.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing a typical example of a conventional device;
The figure is an explanatory diagram of one embodiment of the device of the present invention. 1...Fuel oil tank, 2...Fuel oil pump, 3
...Settling tank, 4...Suction pipe, 4a...
...Fuel oil supply valve, 5...Discharge pipe, 11...Air suction pipe, 11a...Air supply valve.

Claims (1)

[Scope of utility model registration request] It consists of a fuel oil tank, a fuel oil pump, and a settling tank equipped with a liquid level detection device. a fuel oil supply valve that opens according to the discharge pressure of the fuel oil pump; and an air supply valve that opens according to the set value of the suction pressure of the fuel oil pump and closes according to the discharge output of the fuel oil pump that is equal to or less than the set value of the fuel oil pump. The fuel oil pump is connected to the settling tank by a discharge pipe, and is activated when the lower limit liquid level is detected by the liquid level detection device. 1. A fuel oil transfer device for a marine engine, characterized in that it stops in response to a discharge pressure below a set value.