JP2012017123A - Fuel oil transferring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel oil transferring apparatus which heats fuel oil in a storage tank 1 by making a heated fuel oil flow down to be mixed with the fuel oil in the storage tank 1 through an intake main pipe 14.SOLUTION: A valve 15 which holds a spring is installed at the downstream side of the transferring pump 4 of a transferring pipe 2. In addition, the valve 15 which holds the spring is installed at the downstream side of the flow-down pump 7 of an intake pipe 6. The heated fuel oil in a purifying tank 3 and/or a service tank 5 is prevented from flowing backward into the transferring pipe 2, and in addition, the heated fuel oil in the purifying tank 3 and/or the service tank 5 is prevented from flowing downward into the intake pipe 6, and transferred into the storage tank while preventing natural flow-down.

Description

  TECHNICAL FIELD The present invention relates to a fuel oil transfer device for a boiler such as a ship or a generator (hereinafter referred to as “ship or the like”), and in particular, during the stop of heated fuel oil in a fuel oil tank and / or a fuel oil service tank. The present invention relates to a fuel oil transfer device that prevents natural flow or reverse flow of water.

When supplying fuel oil to an engine in a ship or the like, usually, the fuel oil is first sent from a fuel oil storage tank to a fuel oil tank through a transfer pipe by a transfer pump, and then from the fuel oil tank to a fuel oil service. It is sent to a tank (fuel oil dispensing tank), from which fuel oil is supplied to the engine. At this time, the fuel oil in the fuel oil storage tank needs to be heated in order to reduce the viscosity and facilitate transfer.

  Conventionally, as a fuel oil transfer device having this kind of heating equipment, a device that does not include the valve 15 in FIG. 1, that is, a fuel oil storage tank 1 and a heating device (not shown) communicated with this via a transfer pipe 2. A fuel oil tank 3, a transfer pump 4 for transferring the fuel oil in the fuel oil storage tank 1 to the fuel oil tank 3, and a fuel oil service tank 5 communicated with the fuel oil tank 3. The fuel oil tank 3 and the fuel oil service tank 5, or both of the fuel oil tank 3 and the fuel oil service tank 5 are connected to the fuel oil storage tank 1. There is known an apparatus provided with a flow-down pump 7 for flowing the heated fuel oil in either one or both of them into the fuel oil storage tank 1. In FIG. 1, 8 is a heater, 9 is a temperature sensor, 10, 11, 12, and 13 are valves.

  In the apparatus of FIG. 1 that does not have the valve 15 described above, the fuel oil in the fuel oil tank 3 is heated by a heating device (not shown), and then cleaned by a fuel oil purifier (not shown) and sent to the fuel oil service tank 5. From here, it is distributed and supplied to a main machine, auxiliary machines, boilers and the like (not shown). At the same time, part of the heated fuel oil is caused to flow down to the fuel oil storage tank 1 through the suction main pipe 14 in the tank 1 by the operation of the flow down pump 7, and the fuel oil in the tank 1 is heated.

  In the apparatus of FIG. 1 that does not have the valve 15 described above, part of the heated fuel oil is returned from the fuel oil tank 3 or the fuel oil service tank 5 to the fuel oil storage tank 1 to add the fuel oil in the tank 1. When warming, the amount and temperature to be returned need to be changed in accordance with the length of the suction pipe 6 and the transfer pipe 2, or the temperature change of seawater and outside air.

  That is, when the amount of heat of the heated fuel oil to be returned is larger than the appropriate value, the heat dissipation of the heat amount to the seawater or the outside air is increased, and when it is less, the required amount of fuel oil cannot be transferred. It is necessary to keep the amount and temperature of the heated fuel oil returned properly.

  However, in the apparatus of FIG. 1 that does not include the valve 15 described above, when a part of the heated fuel oil in the clarification tank and / or the service tank is caused to flow down to the fuel oil storage tank, the fuel oil enters the fuel oil storage tank. It does not return and flows backward in the direction of the transfer pipe. Also, air bubbles are generated when the fuel oil from the fuel oil storage tank is sent in the direction of the transfer pipe.

  Furthermore, the apparatus of FIG. 1 is also known in which the valve 15 described above is provided only in the transfer pipe 2. (Patent No. 3807597)

  Even when the fuel oil transfer device is stopped, the pressure on the inlet side (suction side) is high and the pressure on the outlet side (discharge side) is mostly low. This is because the fuel oil tank (pump suction side) is higher than the fuel oil storage tank (pump discharge side). Therefore, even when the apparatus is shut down, this pressure causes unintentional flow of oil from the clarification tank and / or service tank to the storage tank.

Japanese Patent No. 3807597

None

  Therefore, the problem to be solved by the present invention is to improve the drawbacks of the above-mentioned known techniques for preventing the natural flow or back flow of the heated fuel oil in the fuel oil tank and / or the fuel oil service tank during shutdown. Another object of the present invention is to provide a fuel oil transfer device.

In order to solve the above-described problem, according to the present invention, a fuel oil storage tank provided with a suction main pipe, a fuel oil tank connected to the storage tank via a transfer pipe, and the transfer pipe are provided.
A transfer pump for transferring fuel oil in the storage tank to the clarifier tank through a transfer pipe, a fuel oil service tank in communication with the clarifier tank, and the clarifier tank and / or the service tank and the storage tank in communication. A suction pipe, and a flow-down pump disposed in the suction pipe and configured to flow the heated fuel oil in the clarification tank and / or the service tank to the storage tank, and the heated fuel oil is supplied to the storage tank. In the fuel oil transfer device for heating and mixing the fuel oil in the storage tank by flowing down through the main suction pipe, a valve holding a spring is provided on the downstream side of the transfer pump of the transfer pipe. A valve holding a spring is also provided downstream of the downflow pump, and the spring can be set to an arbitrary pressure. The valve holding the ring abuts the valve presser against the valve seat by the pressing force of the spring, prevents the backflow of heated fuel oil to the transfer pipe, and further prevents the flow down to the suction pipe. The heated fuel oil in the clarification tank and / or service tank does not flow back to the transfer pipe, and the heated fuel oil in the clarification tank and / or service tank does not flow down to the intake pipe. It transfers to the said storage tank, preventing a flow down.

  In the present invention described above, the valve holding the spring is provided downstream of the transfer pump of the transfer pipe, and the valve holding the spring is provided further downstream of the downflow pump of the suction pipe. Prevents backflow to the transfer pipe, and further prevents flow to the suction pipe, so that the heated fuel oil in the clarification tank and / or service tank does not flow back to the transfer pipe, but also flows to the suction pipe. Prevent natural flow without letting.

It is a flow sheet of the fuel oil transfer device of the present invention. It is a specific example of the valve used for the fuel oil transfer device of the present invention, and is a sectional view in a closed state. It is a specific example of the valve used for this invention fuel oil transfer apparatus, Comprising: It is sectional drawing of the open state.

  In FIG. 1, the fuel oil transfer device of the present invention includes a fuel oil storage tank 1 having a suction main pipe 14, a fuel oil tank 3 communicated with the storage tank 1 via a transfer pipe 2, and a transfer pipe 2. A transfer pump 4 for transferring the fuel oil in the storage tank 1 to the clear tank 3 through the transfer pipe 2, a fuel oil service tank 5 communicating with the clear tank 3, a clear tank 3 and / or a service tank 5; A suction pipe 6 communicating with the storage tank 1, and a flow-down pump 7 disposed in the suction pipe 6 and allowing the heated fuel oil in the clarification tank 3 and / or the service tank 5 to flow down to the storage tank 1, The heated fuel oil is mixed with the fuel oil in the storage tank 1 through the suction main pipe 14 to heat the fuel oil in the storage tank 1. In FIG. 1, 8 is a heater, 9 is a temperature sensor, 10, 11, 12, and 13 are valves.

  In the above-described apparatus of the present invention, the main point of improvement is that a valve 15 holding a spring 16 is provided on the downstream side of the transfer pump 4 of the transfer pipe 2 and further on the downstream side of the downflow pump 7 of the suction pipe 6. In addition, the valve 15 holding the spring 16 is provided, so that the heated fuel oil in the clarification tank 3 and / or the service tank 5 does not flow backward in the direction of the transfer pipe 2, and The heated fuel oil in the clarification tank 3 and / or the service tank 5 is allowed to flow down to the storage tank 1 while not flowing down to the suction pipe 6 while preventing it from flowing down.

  2 is a cross-sectional view of the valve 15 in a closed state, and FIG. 3 is a cross-sectional view of the valve 15 in an open state. During operation stop, the handle 18 is closed and the valve presser 21 is brought into contact with the valve seat 22 as shown in FIG. Let me. In this state, the fuel oil from the inlet 19 does not travel to the outlet 20.

  During operation, the handle 18 is normally opened as shown in FIG. 3, and the valve stem 23 is raised upward. Even in this state, the valve presser 21 is normally pressed against the valve seat 22 via the washer 17 by the pressing force of the spring 16. For this reason, the valve presser 21 is in contact with the valve seat 22, and fuel oil from the inlet 19 is blocked by the valve presser 21 and does not pass to the outlet 20. Therefore, the heated fuel oil is prevented from flowing backward in the direction of the transfer pipe 2, and the heated fuel oil is also prevented from flowing naturally in the direction of the suction pipe 6. At the same time, air bubbles generated from the fuel oil storage tank 1 through the suction main pipe 14 are crushed and disappear.

The spring 16 can be of any pressure, for example about 0.098 MPa. It can be set to 1.0 kgf / cm ² (when fully open). Thereby, the heated fuel oil from the fuel oil storage tank 1 pushes up the valve presser 21 from the inlet 19 and flows in the direction of the outlet 20. At this time, bubbles generated by air are also erased by pressure.

  Since the fuel oil transfer device according to the present invention is provided with the valve 15 holding the spring 16 on the downstream side of the transfer pump 4 of the transfer pipe 2 and the downflow pump 7 of the suction pipe 6, the clear tank 3 and / or the service tank 5 are provided. The heated fuel oil is not allowed to flow back to the transfer pipe 2 and is not allowed to flow naturally to the suction pipe 6 and is allowed to flow into the storage tank, and air bubbles in the transfer pipe 2 are automatically crushed. Disappears and the industrial applicability is high.

DESCRIPTION OF SYMBOLS 1 Fuel oil storage tank 2 Transfer pipe 3 Fuel oil clarifier tank 4 Transfer pump 5 Fuel oil service tank 6 Suction pipe 7 Downflow pump 14 Suction main pipe 15 Valve 16 Spring 17 Washer 18 Handle 19 Inlet 20 Outlet 21 Valve presser 22 Valve seat 23 Valve rod

Claims (1)

A fuel oil storage tank provided with a suction main pipe, a fuel oil tank connected to the storage tank via a transfer pipe, and a fuel oil tank provided in the transfer pipe through which the fuel oil in the storage tank is passed through the transfer tank A transfer pump that transfers to the clarification tank, a fuel oil service tank that communicates with the clarification tank, an intake pipe that communicates the clarification tank and / or the service tank and the storage tank, and the clarification tank And / or a flow pump for flowing the heated fuel oil in the service tank to the storage tank, and mixing the heated fuel oil into the fuel oil in the storage tank through the suction main pipe. In the fuel oil transfer device for heating the fuel oil, a valve holding a spring is provided on the downstream side of the transfer pump of the transfer pipe, and a suction pipe is further provided. A valve holding a spring is also provided on the downstream side of the downflow pump, and the spring can be set to an arbitrary pressure, and the valve holding such a spring abuts the valve presser against the valve seat by the pressing force of the spring, The heated fuel oil is prevented from flowing back to the transfer pipe, and is further prevented from flowing down to the suction pipe, whereby the heated fuel oil in the clarification tank and / or service tank flows back to the transfer pipe. And further, the heated fuel oil in the clarification tank and / or service tank is transferred to the storage tank while preventing natural flow without flowing down to the suction pipe. .