TW201823142A - Fuel oil transfer device setting a rotation condition to prevent a drive motor of a pump from burning out when the temperature of the fuel oil is equal to or higher than the temperature at which the flow resistance of the viscosity does not increase - Google Patents

Abstract

Provided is a fuel oil transfer device that inhibits damages of a member that is used for increasing the viscosity of the fuel oil, which is a cause of a decrease in the transfer efficiency of the fuel oil, while without lowering the transfer efficiency of the fuel oil. A control unit is provided to adjust the fuel oil flow by setting a rotation condition of the cooling air to the extent that the drive motor of the pump not burning out is ensured when the temperature of the fuel oil is equal to or higher than the temperature at which the flow resistance of the viscosity does not increase.

Description

   Fuel oil transfer device   

The present invention relates to a fuel oil transfer device. More specifically, the present invention relates to a fuel oil transfer device that does not reduce the transfer fluidity of the fuel oil used in main engines and auxiliary machinery such as ships and generators.

One of the fuel oils used in boilers for ships and generators is known as C heavy oil. Fuel oils with high viscosity, such as C heavy oil, are susceptible to changes in viscosity due to temperature. As the viscosity increases, the flow resistance increases, and the transferability deteriorates.

In order to avoid an increase in the flow resistance, a process of increasing the temperature of the fuel oil is used. Fuel oil decreases viscosity due to temperature rise and reduces flow resistance.

The structure of a fuel oil transfer device provided with heating equipment for increasing the temperature of the fuel oil is known, for example, including a fuel oil separation tank for heating the fuel oil transferred from the fuel oil storage tank, and a temperature rise The fuel oil stored in the fuel oil separation tank is a configuration of a fuel oil service tank for supplying the stored fuel oil to the fuel oil storage tanks little by little (for example, Patent Document 1).

The fuel oil is transferred from the fuel oil storage tank to the fuel oil separation tank through a transfer pump, and the viscosity of the fuel oil separation tank is reduced by being heated. The fuel oil heated in the fuel oil separation tank is transferred to the fuel oil service tank after being purified, and a portion of the fuel oil service tank is directed toward the fuel oil storage tank to be discharged little by little through the pump. .

The fuel oil is a fuel injection device that is supplied from a fuel oil service tank to a main engine of an internal combustion engine used for a ship, a generator, or other auxiliary machinery.

The fuel oil heated and returned to the fuel oil storage tank is partially mixed with the fuel oil stored in the storage oil tank. As a result, the fuel oil contained in the fuel oil storage tank was partially maintained at 36 to 40 ° C. Part of it means that at least the periphery of the fuel oil suction port arranged in the fuel oil storage tank barrel.

The temperature of the fuel oil is maintained for the following reasons. The first is to prevent an increase in flow resistance that occurs in the circulation path of the fuel oil from adversely affecting a high load on a pump or the like, and the second is to prevent the fuel oil from being transferred from the fuel oil storage tank to the fuel oil separation tank. The amount is unstable due to viscosity.

Conventionally, the structure for preventing the temperature drop of the fuel oil in the fuel oil storage tank has a structure including a down-flow pump that sends the heated fuel oil toward the fuel oil storage tank as in Patent Document 1.

The flow-down pump has a structure in which, for example, a motor is rotationally driven by a motor. The motor is controlled by an inverter that can output control according to the operating conditions.

The inverter control of the motor is to determine the difference between the temperature of the detected fuel oil and the predetermined temperature corresponding to the viscosity that does not increase the flow resistance of the fuel oil. If the detected temperature is lower than the specified temperature, it will be heated. The way to increase the supply of fuel oil is to increase the number of rotations of the down pump. When the detected temperature is higher than a predetermined temperature, the rotation control of the down-flow pump is performed so that the supply amount of the fuel oil after heating is reduced.

The motor is a cooling fan provided with cooling air caused by its rotation. If the number of rotations of the cooling fan decreases, the air volume for preventing the motor from overheating cannot be ensured. If the motor overheats and breaks, it will affect the operation of the pump, and it will be impossible to transfer the heated fuel oil to the fuel oil storage tank. As a result, the viscosity of the fuel oil cannot be reduced, and the fuel oil transfer efficiency is reduced.

    [Xizhi technical literature]         [Patent Literature]    

[Patent Document 1] Japanese Patent Laid-Open No. 2004-36594

An object of the present invention is to provide a fuel oil transfer device that can prevent damage to a member for increasing the viscosity of a fuel oil that causes a decrease in the transfer efficiency of the fuel oil, and does not reduce the transfer efficiency of the fuel oil.

In order to solve this problem, the present invention is a detection result of a temperature sensor that detects the temperature of the fuel oil flowing in the fuel oil separation tank. If the temperature of the fuel oil reaches the viscosity, the viscosity does not increase the flow resistance. When the temperature is higher than or equal to the temperature, the rotation condition of the cooling air that can ensure that the drive motor of the pump is not burned is set, and the flow rate of the fuel oil is adjusted.

According to the present invention, when the viscosity of the fuel oil is suppressed, and the viscosity of the fuel oil having no increase in flow resistance is obtained, and the amount of the fuel oil that has been heated is reduced, it is possible to prevent the pump rotation caused by the reduction The cooling air of the motor which is caused by the burnt down.

1‧‧‧ fuel oil transfer device

2‧‧‧ fuel oil storage tank barrel

3‧‧‧ fuel oil separation tank

4‧‧‧ fuel oil tank

5‧‧‧ transfer tube

6‧‧‧ transfer pump

7‧‧‧ temperature sensor

8‧‧‧ Pressure Sensor

9‧‧‧ level sensor

10‧‧‧ Suction tube

11‧‧‧ flow down pump

12‧‧‧ Valve

15‧‧‧ operation panel

16‧‧‧ timing

20‧‧‧Control Department

[FIG. 1] A schematic diagram showing a configuration of a fuel oil transfer device and a flow of fuel oil when the fuel oil is heated according to an embodiment of the present invention.

[FIG. 2] A schematic diagram showing the flow of fuel oil at the time of fuel oil transfer performed by the fuel oil transfer device shown in FIG.

[Fig. 3] A block diagram for explaining the configuration of a control unit used in the fuel oil transfer device shown in Fig. 1. [Fig.

[Fig. 4] A line diagram for explaining a principle used for determining a predetermined condition implemented by a control unit as shown in Fig. 3. [Fig.

Hereinafter, the aspect for implementing this invention is demonstrated.

FIG. 1 is a diagram showing a configuration of a fuel oil transfer device 1 according to an embodiment for implementing the present invention. The fuel oil transfer device 1 includes a fuel oil separation tank 3 and a fuel oil service tank 4 that are in communication with the fuel oil storage tank 2.

The fuel oil separation tank 3 is a tank for heating fuel oil, and an example of the fuel oil is heated to a temperature of 70 to 80 ° C. by a heater (not shown).

The fuel oil storage tank barrel 2 and the fuel oil separation tank barrel 3 are connected by a transfer pipe 5. In the middle, a transfer pump 6, a temperature sensor 7, and a pressure sensor 8 are arranged.

The temperature sensor 7 measures, for example, the temperature of the fuel fill port side of the transfer pump 6, that is, the temperature of the suction side of the fuel oil.

The pressure sensor 8 is provided to monitor the pressure change of the fuel oil sucked into the transfer pump 6. The pressure change is used to determine a change in flow resistance corresponding to a change in the viscosity of the fuel oil. In particular, when the viscosity becomes high and the flow resistance increases, the pressure on the inlet side of the transfer pump 6 tends to become vacuum. Therefore, if a change in pressure due to vacuumization is detected, heating for reducing the viscosity of the fuel oil becomes necessary.

The fuel oil separation tank barrel 3 is provided with a liquid level sensor 9 for detecting the liquid level of the fuel oil sucked by the transfer pump 6.

The liquid level sensor 9 is a sensor that can detect the liquid level when the fuel oil is introduced into the fuel oil separation tank 3 by a predetermined amount. The liquid level sensor 9 is used to stop the driving of the transfer pump 6 when the fuel oil is introduced into the fuel oil separation tank 3 and a predetermined amount is detected.

The fuel oil service tank 4 is a tank used to temporarily store the heated and cleaned fuel oil and supply the fuel oil to an internal combustion engine or the like. The fuel oil storage tank bucket 2 and the fuel oil service tank bucket 4 are connected by a suction pipe 10, and a flow-down pump 11 is arranged in the middle. A part of the fuel oil stored in the fuel oil service tank bucket 4 is caused to flow down to the fuel oil storage tank bucket 2 by flowing down the pump 11 to raise the temperature of the fuel oil in the fuel oil storage tank bucket 2.

The reason for the name of the down-flow pump 11 in this case is the premise that the fuel oil service tank barrel 4 is arranged at a higher position than the fuel oil storage tank barrel 2. In other words, this also means that the fuel oil is discharged from the upper fuel oil service tank bucket 4 toward the lower fuel oil storage tank bucket 2 and is expressed as flowing down.

In the configuration shown in FIG. 1, a configuration is adopted in which the fuel oil separation tank 3 and the fuel oil service tank 4 communicate with the suction pipe 10 respectively. Therefore, it is possible to set the flow path of the fuel oil from the tanks 3 and 4 or any of the tanks toward the fuel oil storage tank 2 at the outlet of the fuel oil in each tank 3 and 4. Set the valve 12.

The fuel oil transfer device 1 heats the fuel oil sucked from the fuel oil storage tank bucket 2 toward the fuel oil separation tank bucket 3 by the transfer pump 6, and the heated fuel oil is purified and sent to the fuel oil service tank. The barrel 4 is introduced, and the stored fuel oil is supplied to an internal combustion engine or the like.

A part of the fuel oil temporarily stored in the fuel oil separation tank 3 and / or the fuel oil service tank 4 is returned to the fuel oil storage tank 2 by the down-flow pump 11. As a result, the fuel oil in the fuel oil storage tank 2 is partially heated to 36 to 40 ° C. by being mixed with the heated fuel oil.

In the present embodiment, the operating time of the pumps is selected, for example, the transfer pump 6 is operated approximately 15 minutes and the down pump 11 is operated alternately approximately 45 minutes. The operating time of the transfer pump 6 during this time is, for example, the time until the liquid level of the fuel oil is detected by the liquid level sensor 9 in the fuel oil separation tank 3 described above. That is, if the fuel oil level is detected by the liquid level sensor 9 during the operating time when the fuel oil flows based on the rated flow rate such as the number of rotations of the transfer pump 6 and the drive current, it can be determined as fuel. The viscosity of the fuel oil that does not occur due to the flow resistance of the oil. When the operating time is exceeded, it can be determined that the viscosity of the fuel oil is high and the fluidity is poor.

When no fuel oil is consumed during berthing, the operation time of the transfer pump 6 is shortened, and the time until the liquid level sensor 9 operates is, for example, approximately 6 minutes.

The path through which fuel oil is sucked in from the fuel oil storage tank bucket 2 to the fuel oil separation tank bucket 3 for 15 minutes using the transfer pump 6 is shown by symbols F1 to F5 in FIG. 1. The path through which the fuel oil flows down from the fuel oil separation tank 3 and / or the fuel oil service tank barrel 4 toward the fuel oil storage tank barrel 2 using the downflow pump 11 is shown by arrows F10 to F13 in FIG. 2.

The fuel oil transfer device 1 using such a configuration has a configuration of a main part as in Japanese Patent Application Laid-Open No. 2012-17123 as in the previous case of the present applicant.

A feature of the fuel oil transfer device 1 of the present embodiment having the above configuration is the operation control of the down pump when the temperature of the fuel oil reaches a predetermined temperature or more. In particular, it is characterized by control for preventing burnout of a motor, which is liable to occur when the supply amount of the heated fuel oil is reduced.

The fuel oil transfer device 1 can select any one of a normal operation mode to be executed when the viscosity of the fuel oil is low and the flow resistance is small, and a heating operation mode to be executed when the viscosity is high and the flow resistance is increased. In the normal operation mode, the transfer pump 6 that operates in response to the operating state of the level sensor 9 and the down-flow pump 11 that supplies fuel oil into the fuel oil storage tank 2 are operated alternately to circulate the fuel oil. mode. In the heating operation mode, the transfer pump 6 is forcibly stopped, the fuel oil intercepted on the suction side of the transfer pump 6 is heated, and the fuel oil storage tank 2 is also heated by the fuel oil returned to the fuel oil storage tank 2 Fuel oil heating mode. The heating operation mode is preferably performed until the viscosity of the fuel oil intercepted on the side of the transfer pump 6 reaches a value that does not increase the flow resistance.

For the conditions for executing the heating operation mode, the following examples can be used.

That is, the parameters include at least the temperature and pressure of the fuel oil sucked toward the transfer pump 6 and the operation time of the transfer pump 6. Regarding the operation time of the transfer pump 6, as described above, reference is made to the operation time until the liquid level sensor 9 operates, and the timing time of the timer provided in the transfer pump 6. If all or any of these parameters are consistent with predetermined conditions necessary for heating, the heating operation mode is executed.

Hereinafter, the structure and operation for implementing this operation mode will be described using FIG. 3.

The transfer pump 6 and the down-flow pump 11 are controlled in the operating state by the control unit 20 shown in FIG. 3.

As shown in FIG. 3, the control unit 20 is connected to the input side with a temperature sensor 7, a pressure sensor 8, and a liquid level sensor 9 provided in the transfer tube 5. The drive unit of the transfer pump 6 and the drive unit of the down pump 11 are connected to the output side of the control unit 20, respectively. Both the transfer pump 6 and the down-flow pump 11 use a type in which the flow rate and flow rate can be controlled by rotating a motor (shown by symbols M1 and M2 in Figs. 1 and 2).

In Fig. 3, reference numeral 15 is used to display the operating time of each of the pumps 6, 11 and the fuel oil flow rate, etc., and input necessary conditions for further returning the fuel consumption amount, etc., into the operation panel. Reference numeral 16 is the timing. Device.

The timer 16 measures, for example, the time from the point when the operation of the transfer pump 6 starts until the liquid level detection by the liquid level sensor 9. Therefore, when the transfer pump 6 is running and the operating time until the liquid level detected by the liquid level sensor 9 is too long, that is, when the operating time of the transfer pump 6 is too long, it can be determined that it is flowing in the transfer pump 6 Fuel oil with high viscosity and high flow resistance. The transfer pump 6 itself may be provided with a timer for measuring the operation time. In this case, the transfer pump 6 is in a state where the viscosity of the fuel oil is high and the flow resistance is high when the transfer pump 6 has been operated for more than the set operating time of its own timer.

It is also possible to determine the viscosity of the fuel oil by using the pressure sensor 8 to detect the fuel oil suction pressure of the transfer pump 6. If the viscosity of the fuel oil is high and the flow resistance is high, it can be determined that the inlet-side pressure of the transfer pump 6 has a tendency to become vacuum.

In addition, a monitoring target item used when determining that the viscosity of the fuel oil is a predetermined condition for increasing the viscosity of the flow resistance may be a driving current value of a motor used in a driving source of the transfer pump 6.

The drive current value is a preset number of rotations of the motor. Although it is determined to obtain torque, when the number of rotations and torque changes, it returns to the original state, especially when the number of rotations and torque decreases. The drive current value will increase. Here, when the driving current value is increased, it is possible to judge the increase by monitoring the viscosity of the fuel oil, and the operation mode can be switched.

In the normal operation mode selected by the control unit 20, when the viscosity of the fuel oil does not increase the value of the flow resistance, the fuel oil is circulated while maintaining the temperature. According to this operation mode, it is possible to maintain a state in which the temperature of the fuel oil stored in the fuel oil storage tank 2 is suppressed from decreasing and the viscosity is prevented from increasing.

The control unit 20 in the normal operation mode monitors the temperature and pressure of the fuel oil introduced to the transfer pump 6 and the operating time of the transfer pump 6, and is further added to the drive source of the transfer pump 6, which is the drive of the motor. Changes in current value.

These monitoring target items are used for determining the viscosity change of the fuel oil, in particular, when the case of the following four types of cases occurs, and the conditions for the viscosity increase are used.

(1) The case where the viscosity of the fuel oil increases and reaches a temperature below the temperature at which the flow resistance increases.

(2) The pressure change on the fuel oil introduction side of the transfer pump 6 is in a state where a vacuum tendency occurs.

(3) The operation time of the transfer pump 6 until the liquid level sensor 9 is operated is increased.

(4) In the case where the drive current value of the drive source of the transfer pump 6 is increased.

When these predetermined conditions are not satisfied and the increase in the viscosity of the fuel oil does not occur, the normal operation mode is implemented.

During the execution of the normal operation mode, the fuel oil is drawn in from the fuel oil storage tank 2 to the fuel oil separation tank 3, and the fuel oil in the fuel oil separation tank 3 and / or the fuel oil service tank 4 is partially oriented. The cycle in which the fuel oil storage tank 2 flows down is alternately repeated. However, during the cycle, the transfer pump 6 is stopped in response to the operation of the liquid level sensor 9. The operation states of the pumps 6 and 11 when this operation mode is executed are displayed on the operation panel 15.

When the monitoring of the monitoring target item is continued and the normal operation mode is executed, when all, any one or a plurality of predetermined conditions guided by the monitoring target item are consistent, the normal operation mode is switched to Heating operation mode.

In the heating operation mode, the transfer pump 6 is forcibly stopped, and the down-flow pump 11 is operated to cause the heated fuel oil to flow toward the fuel oil storage tank 2. At this time, the heated fuel oil flows toward the fuel oil storage tank 2 while mixing with the fuel oil intercepted at this position via the fuel oil introduction side of the transfer pump 6. The fuel oil, for example, functions to clear the clogging of the filter when the filter (the member shown by the symbol FT in FIG. 2) flows countercurrently.

In the heating operation mode, in order to increase the temperature of the fuel oil in the fuel oil storage tank 2, the amount of fuel oil flowing into the fuel oil storage tank 2 is increased so that the number of rotations of the down pump 11 is increased. Rotation conditions are also possible.

In the control unit 20, the temperature and pressure can be directly monitored by a sensor among the monitoring target items, but the operating time of the transfer pump 6 until the liquid level is detected using the liquid level sensor 9 is based on The state shown in FIG. 4 determines whether or not the heating operation mode is performed.

In FIG. 4, the vertical axis indicates the amount of fuel oil (the amount of operation of the liquid level sensor 9), and the horizontal axis indicates the time.

In the figure, as the viscosity of the fuel oil becomes higher, the time required for the liquid level sensor 9 to operate when the transfer pump 6 is constantly output becomes longer.

Therefore, based on the time (the time shown by the symbol T in FIG. 4) until the fuel level separation sensor 9 is actuated into the fuel oil separation tank 3 with a relatively low viscosity fuel oil, the time is longer than this time. In the case of growth (the time shown by the symbol T1 in FIG. 4), it can be judged that the viscosity of the fuel oil is high. In addition, when the transfer pump 6 itself has a timer, it can be determined that the viscosity of the fuel oil is high when the set time of the timer and the actual operating time are compared if the actual operating time is increased.

When all, a part, or a plurality of predetermined conditions guided from the monitoring target item are consistent, if the heating operation mode is selected, the heated fuel oil is sent toward the fuel oil storage tank 2. As a result, not only the fuel oil directly mixed with the fuel oil in the fuel oil storage tank 2 but also the fuel oil intercepted on the suction side of the transfer pump 6 is also mixed, and the temperature of the fuel oil can be increased. As a result, since the fuel oil is heated by the oil passage before the fuel oil is sucked into the transfer pump 6, it is possible to ensure that the viscosity of the fuel oil flowing into the transfer pump 6 decreases.

The monitoring target items, that is, temperature, pressure, and operating time of the transfer pump are further changes in the driving current value of the transfer pump motor. When the condition that the viscosity increase is resolved is reached, and the conditions do not agree with the predetermined conditions, it returns to Normal operation mode.

However, in addition to the above-mentioned heating of the fuel oil, the control unit 20 may perform the fuel oil transfer control in a case where it is not necessary to actively heat the fuel oil.

That is, when the viscosity of the fuel oil reaches a temperature that is equal to or higher than the viscosity that does not increase the flow resistance (for example, 38 ° C. or higher), the circulation amount of the fuel oil heated by the fuel oil separation tank 4 can be reduced.

Here, the control unit 20 performs rotation control of the down pump 11 in order to reduce the circulation amount of the fuel oil.

This control is based on the temperature difference between the detected temperature from the temperature sensor 7 and a predetermined temperature at which a predetermined temperature at which no viscosity of flow resistance can be obtained, so that the rotation conditions of the drive motor set on the down pump 11 side are controlled. Amended.

The correction of the rotation conditions of the drive motor is, for example, a method in which the number of rotations is reduced stepwise in accordance with the difference when a temperature difference above a predetermined temperature occurs, or the load at each time point of driving and stopping is changed using the same number of rotations. Work control.

When changing the number of rotations of the drive motor, considering the rotation of the cooling fan around the number of rotations, the minimum number of rotations is preferably the minimum number to ensure that cooling air can be obtained without causing motor burnout.

When the driving motor's driving and stopping time points are changed, the number of rotations of the driving motor may be unchanged, but in this case, it is possible to ensure that the burning of the driving motor does not cause a minimum of cooling air. In other words, the motor is suppressed The stop time for temperature rise is better.

An example of the former rotation control is to ensure that the number of rotations of the fuel oil supply is 500 rpm and the number of rotations of the cooling air volume is 530 rpm. You can choose to use the latter value or use the initial setting of 530 rpm. When the value is 500 rpm, etc. In the case of a stepwise correction, although the reduction amount cannot be obtained immediately, because it is not a fuel oil with increased viscosity, it does not cause obstacles in the circulation of the fuel oil.

As an example of the driving and stopping time points, for example, driving and stopping are repeatedly performed every 30 seconds within 45 minutes, or driving time and stopping time are alternately repeated.

Since the number of rotations of the motor is the same as the normal operation mode, the air volume obtained by using the number of rotations in the case of intermittent operation is larger than the number of rotations for reducing the fuel oil. Therefore, the cooling of the motor can ensure the necessary air volume.

As described above, the rotation condition is calculated based on the comparison result of the load-to-work ratio corresponding to the temperature difference. The calculated rotation condition is applied to the drive motor as the drive current value.

The driving motor that is driven in a state where the rotation conditions are changed is used to execute the heating operation mode when the temperature on the inlet side of the transfer pump 6 is changed to a predetermined temperature or lower than a predetermined temperature and the predetermined conditions are consistent with each other. The down-flow pump 11 is controlled by operation.

According to the fuel oil transfer device 1 of the above embodiment, when the temperature of the fuel oil is a temperature that increases the flow resistance of the fuel oil, the fuel oil in the fuel oil storage tank barrel other than the fuel oil sucked toward the transfer pump can be heated. .

The heating of the fuel oil is not necessary, and the supply of fuel oil after heating is suppressed, and the number of rotations of the drive motor of the pump is suppressed, so that the cooling air that does not cause a degree of burnout of the drive motor can be ensured.

    [Industrial availability]    

According to the present invention, both the fuel oil sucked into the transfer pump and the fuel oil in the fuel oil storage tank can be heated simultaneously by the forced stop of the transfer pump. As a result, unlike the case where the fuel oil with increased viscosity is transferred by the transfer pump, the load on the transfer pump can be reduced quickly, and only by the driving of the down pump can the transfer pump be restarted. Shorten time. Furthermore, the cooling of the drive motor can be maintained even in the case where the rotation of the pump is suppressed in response to a request to reduce the supply amount of the heated fuel oil. Therefore, there is an advantageous point that it is possible to prevent the disadvantages such as burnout of the motor. High usability.

Claims (4)

    A fuel oil transfer device includes a transfer pipe provided between a fuel oil storage tank and a fuel oil separation tank capable of heating fuel oil, and the fuel oil in the fuel oil storage tank is directed toward the fuel oil separation tank. A suction transfer pump, and a suction pipe provided to connect the fuel oil service tank bucket temporarily storing the heated fuel oil and the fuel oil storage tank bucket, and to fuel the fuel oil little by little The discharged down pump and a control unit for controlling the operation state of the transfer pump and the down pump. The control unit detects the temperature of the fuel oil flowing from the fuel oil storage tank to the fuel oil separation tank. The temperature sensor and the pressure sensor for detecting the pressure of the fuel oil flowing into the transfer pump are connected to the input side, and the driving parts of the transfer pump and the down pump are connected to the output side. When the temperature is above the temperature corresponding to the viscosity that does not increase the flow resistance, set the cooling conditions of the cooling air to ensure that the drive motor of the pump will not burn. The flow of fuel oil.         For example, the fuel oil transfer device according to item 1 of the patent application scope, wherein the control unit is based on a result of comparing the data from each of the sensors with the predetermined conditions. If the fuel oil sucked into the transfer pump has a higher viscosity, In such a case, the rotation conditions are changed so that the amount of fuel oil flowing in the fuel oil storage tank may increase.         For example, the fuel oil transfer device according to item 1 of the patent application scope, wherein the control unit is based on a result of comparing the data from each of the sensors with the predetermined conditions. If the fuel oil sucked into the transfer pump has a higher viscosity In such a case, the transfer pump is stopped, and the supply condition of the fuel oil flowing through the fuel oil storage tank is increased so that the rotation conditions are changed.         For example, the fuel oil transfer device in the first patent application range, wherein the control unit is based on the result of comparing the data from the sensors with the predetermined conditions. If the viscosity of the fuel oil sucked into the transfer pump is equivalent, When the viscosity of the flow resistance is not increased, the rotation condition is changed so that the fuel oil supply amount obtained by the down-flow pump is reduced.