JPH0916269A - Fuel system of private power generating facility for emergency - Google Patents

Abstract

PURPOSE: To provide a fuel system of the private power generating facilitates for emergency which can automatically and equally select a main oil storage tank. CONSTITUTION: For two main oil storage tanks 1A and 1B, one small-quantity fuel feed tank 2 is provided, and an oil feed system which has an oil feed pump 5 and oil feed solenoid valves 7A and 8A and a return oil system which has a return oil pump 6 and return oil solenoid valves 7B and 8B are conducted piping. Oil amount detectors 11A and 11B which detect oil levels continuously and outputs them as corresponding electric signals are installed in the main oil storage tanks 1A and 1B. A deviation decision unit 12 which detects the deviation between the output signals of both the oil amount detectors 11A and 11B is provided, and it is decided whether the amount of oil is large or small judging from the deviation detection value, thereby controlling the solenoid valves 7A and 7B, and 8A and 8B so that large one is selected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to one main storage tank for two main oil storage tanks.
The present invention relates to a fuel system of an emergency private power generation facility provided with a base fuel dispensing tank, and particularly to selective control of its main oil storage tank.

[0002]

2. Description of the Related Art The fuel system of an emergency private power generation facility is shown in FIG.
As shown in FIG. 2, a system configuration in which one fuel dispensing tank 2 is provided for two main oil storage tanks 1A and 1B is often used. An oil supply pipe 3 is provided between the main oil storage tanks 1A and 1B and the fuel dispensing tank 2.
And an oil return pipe 4 are provided, an oil supply pump 5 is provided in the oil supply pipe 3, an oil return pump 6 is provided in the oil return pipe 4, and an oil supply solenoid valve is provided at a branch point of the oil supply pipe 3 on the side of the main oil reservoirs 1A and 1B. 7
A and 7B are arranged and the main oil storage tank 1 at the branch point of the oil return pipe 4
The oil return solenoid valves 8A and 8B are disposed on the A and 1B sides.
Further, float switches 9A, 9B and 10 are installed in the main oil storage tanks 1A and 1B and the fuel dispensing tank 2.

Fuel oil is supplied from a fuel dispensing tank 2 to a diesel engine (in the case of a diesel generator), and when the fuel is consumed due to the operation of the generator during regular inspection, the fuel dispensing The float switch 10 detects the decrease in the liquid level in the tank 2. When there is a certain decrease, the fuel pump 5 is operated and the fuel dispensing tank 2 is replenished with fuel oil.

If an overflow occurs during replenishment, oil is returned by the oil return pump 6. At that time, the oil return destination is the main oil storage tank 1A or 1 that has supplied oil to the dispensing tank 2.
B. That is, the refueling solenoid valves 7A, 7B and the oil return solenoid valves 8A, 8B are controlled to open and close in this way.

Further, which of the main oil storage tanks 1A and 1B is to be used for refueling (selection of the main oil storage tank) is determined based on the oil storage amount. The oil amount is confirmed by constantly monitoring the oil level with the float switches 9A and 9B.

[0006]

However, in the oil amount detection by such a float switch, the point detection is
Since it is difficult to use it effectively and evenly, manual switching is performed visually. Further, for automation, even if the oil amount is easily detected, it is necessary to change the set position and the set number of points depending on the level of the oil amount, that is, the liquid level, which is not easy to select. .

Therefore, an object of the present invention is to solve the above problems and provide a fuel system for an emergency private power generation facility that can automatically and uniformly select a main oil storage tank.

[0008]

SUMMARY OF THE INVENTION According to the present invention, one fuel dispensing tank is provided for two main oil storage tanks, and an oil supply system having an oil supply pump and an oil supply solenoid valve, an oil return pump and an oil return solenoid valve are provided. In the fuel system of the emergency private power generation facility with the oil-return system piping, an oil amount detector installed in both main oil tanks so as to continuously detect the oil level and output it as a corresponding electric signal, Equipped with a deviation determiner that detects the deviation of the output signals of both oil quantity detectors to judge the amount of oil, and controls the solenoid valves of the oil supply system and oil return system to select the one with the larger oil quantity. It is characterized by that.

[0009]

[Function] The oil amount (oil level) in both main oil storage tanks is always continuously detected by the oil amount detector and output as a corresponding electric signal, and the deviation of both output signals is detected by the deviation determiner. To be detected. The amount of oil is judged from this deviation detection value, and the solenoid valves of the oil supply system and the oil return system are controlled so that the one with the larger oil amount is selected. As a result, both main oil storage tanks are effectively and evenly used.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 1 shows an embodiment of the fuel system of the emergency private power generation equipment according to the present invention. In the figure, 1A and 1B are main oil storage tanks, 2 is a fuel dispensing tank, 3 is an oil supply pipe, 4 is an oil return pipe, 5 is an oil supply pump, 6 is an oil return pump, 7A and 7B are oil supply solenoid valves, and 8A and 8B are An oil return solenoid valve, 10 is a float switch installed in the fuel dispensing tank 2, 11A and 11B are oil amount (or level) detectors installed in the main oil storage tanks 1A and 1B, and the liquid level of the main oil storage tank is 0. Continuous detection between ~ 100% produces an output signal of 4-20mA (1-5V). Reference numeral 12 is a deviation determiner that determines the deviation of the output signals of both detectors 11A and 11B and determines the level of the oil level in both main oil reservoirs 1A and 1B, and has output contacts A and B. The output contact A is O when the oil level of the main oil tank 1A is higher.
The N state is set, and the refueling solenoid valve 7A and the return oil solenoid valve 8A on the main oil tank 1A side are excited to open. The output contact B is
When the oil level of the main oil storage tank 1B is higher, it is turned on, and the refueling solenoid valve 7B and the oil return electromagnetic valve 8 on the main oil storage tank 1B side are turned on.
Energize B to open. That is, the one with the higher oil level is automatically and always selected, and the predetermined solenoid valve is selected to prepare for the operation of the generator in an emergency.

Next, the operation will be described. Both main oil storage tanks 1
The oil amount (oil level) of A and 1B is always the oil amount detector 1
It is continuously detected by 1A and 11B and is output as a corresponding electric signal (for example, a current signal of 4 to 20 mA or a voltage signal of 1 to 5 V), and the deviation of both output signals is detected by the deviation determiner 12. It The amount of oil is judged from this deviation detection value, and the solenoid valves 7A, 8A and 7B, 8B of the oil supply system and the oil return system are controlled so as to select the one with the larger oil amount.

For example, if there are more main oil storage tanks 1A,
Output contact A of deviation determiner 12 is ON, output contact B is OF
The fuel supply solenoid valve 7A and the oil return solenoid valve 8A are opened, and the oil supply solenoid valve 7B and the oil return solenoid valve 8B are closed. The main oil tank 1A is selected while the oil amount relationship is in this state. When the oil amount relationship (the oil level level relationship) reverses due to the consumption of fuel oil, the output contact A of the deviation determiner 12 turns OFF, the output contact B becomes 0N, and the refueling solenoid valve 7A and the return solenoid valve 8A close. The oil supply solenoid valve 7B and the oil return solenoid valve 8B are controlled to be in the open state.

The above operation is automatically repeated to effectively and evenly use both main oil storage tanks 1A and 1B.

The oil amount detectors 11A and 11B may be float type, pressure type, capacitance type or the like.

[0016]

As described above, according to the present invention, the oil amount detectors for continuously detecting the oil level and outputting it as corresponding electric signals are installed in both main oil storage tanks, and both outputs are provided by the deviation determiner. Since the deviation of the signal is detected, the solenoid valve is controlled to judge the amount of oil from the deviation detection value and select the larger one,
The main oil storage tank can be selected automatically and evenly. Moreover, since it has a simple structure, it is inexpensive.

[Brief description of the drawings]

FIG. 1 is a structural explanatory view showing an embodiment of a fuel system of an emergency private power generation facility according to the present invention.

FIG. 2 is a structural explanatory view showing a conventional example of a fuel system of an emergency private power generation facility.

[Explanation of symbols]

 1A, 1B ... Main oil storage tank 2 Fuel dispensing tank 5 ... Oil supply pump 6 ... Oil return pump 7A, 7B ... Oil supply solenoid valve 8A, 8B ... Oil return solenoid valve 10 ... Float switch (for dispensing tank) 11A, 11B ... Oil quantity (Level) detector 12 ... Deviation determiner A, B ... Output contact

Claims (1)

[Claims] 1. An oil supply system having one fuel dispensing tank for two main oil storage tanks and having an oil supply pump and an oil supply solenoid valve,
In the fuel system of the emergency private power generation facility equipped with oil return piping with oil return pump and oil return solenoid valve, both main oil storage tanks so that the oil level can be continuously detected and output as a corresponding electric signal. Of the oil supply system and oil return system to detect the difference between the output signals of the oil quantity detector installed in the A fuel system for an emergency private power generation facility, comprising: