JP2581448Y2 - Oil leak detection device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generation system, and more particularly to an oil leakage detection device for detecting leakage of fuel supplied to a power generation system.

[0002]

2. Description of the Related Art In a power generation facility, a prime mover (power generation facility) and a fuel (oil) service tank are disposed separately, and fuel is supplied to the prime mover through a pipe. Is normal. In this case, if there is an oil leak, the engine may be stopped, and the oil may leak to the outside to pollute the river or cause a serious accident such as a fire. Therefore, conventionally, various oil leakage detecting means have been employed.

FIG. 2 is a view showing the structure of this type of conventional oil leak detecting means. For example, a pair of pipes 22 and 23 provided between a fuel service tank 20 and a prime mover 21 are connected to flexible pipes 22a and 22a, respectively. 22b, 23a, and 23b are formed, and an oil leak receiving box 24 is disposed below the flexible pipes 22b, 23b on the prime mover 21 side, which is relatively low, and the presence of oil leaks in the oil leak receiving box 24 is detected. (Not shown)
Was detected at Alternatively, an oil stopper 25 is provided on the bottom plate of the motor 21 that is considered to have a relatively high probability of oil leakage,
The presence of an oil leak in the oil stopper 25 was similarly detected by a sensor.

[0004]

However, all of the conventional means have a drawback that only oil leakage at a specific location can be detected. For example, in the middle of pipes 22 and 23,
If an oil leak occurs at a location other than 4 or the oil retaining 25, it cannot be detected, which may hinder the operation of the power generation equipment, and improvements have been desired.

The present invention has been made under such a background, and an object of the present invention is to provide an oil leak detecting device capable of reliably detecting an oil leak at any place. is there.

[0006]

According to the present invention, there is provided an apparatus for detecting oil leakage when fuel is supplied to a power generation facility, wherein the power generation facility is configured to detect the oil leakage according to its output power. In fuel consumption, a fuel consumption detecting means for detecting a flow rate of the fuel and converting it into a first electric signal representing a fuel consumption, and detecting an output power of the power generation facility to represent the output power Power conversion means for converting to a second electric signal, deviation signal output means for comparing the signal levels of the first and second electric signals and outputting a deviation signal of both,
A warning means for outputting a warning signal when a level deviation between the deviation signal and a preset reference value exceeds an allowable value.

[0007] The second electric signal is a signal obtained by adding a signal proportional to the output power of the power generation facility and an offset signal of a fixed level, and the reference value can be adjusted arbitrarily. It is characterized by the following.

[0008]

The present invention focuses on the point that the fuel consumption increases as the output power of the power generation facility increases, and that a reversible relationship is established unless there is oil leakage between the two. Is what you do. That is, the level deviation of the first and second electric signals is within the allowable value in a normal state, but the apparent fuel consumption increases when an oil leak occurs, and the above relationship is broken,
The level deviation of both electric signals deviates from the allowable value. By detecting this, oil leak detection becomes possible. Even if the power generation facility stops power output, the second electric signal continuously outputs the offset value, so that the level deviation does not exceed the allowable value unless oil leakage occurs.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an oil leakage detecting device according to an embodiment of the present invention. Reference numerals 10 and 11 denote flow meters with a pulse oscillator (hereinafter abbreviated as FM), and reference numerals 12 and 13 denote frequency / voltage converters. (Hereinafter abbreviated as F / V), 14 and 15 are subtractors, 16 is a power converter, 17 is an alarm setting device, and 18 is a generator. The fuel service tank 20, the prime mover 2
1, pipes 22, 23, flexible pipes 22a, 22b,
Reference numerals 23a and 23b denote equipment conventionally used, and the generator 18 is directly connected to the prime mover 21.

In the above configuration, the fuel service tank 2
0 is supplied to the prime mover 21 through the first FM 10, while the surplus fuel is supplied to the second FM 11
Through the fuel service tank 20. After the flow rates of these fuels are converted into pulse signals by the corresponding FMs 10 and 11, for example, the F / Vs 12 and 13, for example, 0 to 5 [V]
Is converted to an analog voltage signal. Both analog voltage signals are subtracted by the first subtractor 14 and guided to the second subtractor 15 as a signal (0 to 5 [V]: hereinafter, a first electric signal) representing the fuel consumption. The second subtracter 15 outputs the first electric signal and the output of the power converter 16 (0 to 5).
[V]: hereinafter, the level of the second electric signal)
The deviation signal is output to the alarm setting device 17 (deviation signal output means).

As shown, the power converter 16 receives the respective outputs of a current detector CT and a transformer PT for detecting a current and a voltage on a wiring connecting the generator 18 and the prime mover 21. The second electric signal, which is the output signal, represents the output power of the generator 18 (power conversion means).

A reference value which can be arbitrarily adjusted is set in the alarm setting device 17, and an alarm is output when the deviation signal exceeds the reference value (alarm means).

The following relationship is established in the oil leakage detection device having the above configuration.

(1) Fuel consumption = fuel supply amount−fuel return amount (2) Fuel consumption∝power of motor 21 (generator output) In this embodiment, the relationship of (1) and (2) is applied, Prime mover 2
The oil leakage detection is performed by comparing the first electric signal representing the fuel consumption of the first and the second electric signal representing the output of the generator 18.

That is, when the fuel supply system is in a normal state, the levels of both signals are substantially the same, and the deviation is minimized.
If an oil leak occurs at the fuel service tank 20, any of the pipes 22, 23, or at the fuel port of the prime mover 21, the apparent fuel consumption increases and the first and second fuel tanks increase according to the relationship (1). The level deviation of the second electric signal is larger than in the normal state. If this level deviation exceeds the reference value of the alarm setting device 17, an alarm is output as described above, and thus, oil leakage can be detected.

In the present embodiment, a structure is adopted which can cope with the case where the prime mover 21 is in a no-load state. That is, at this time, the fuel consumption is not zero, but the output of the generator 18 is almost zero. Therefore, a constant offset voltage is supplied to the power converter 16 so that the deviation does not increase and an alarm is output, so that the second electric signal maintains a constant level even when the prime mover 21 is in a no-load state. I do. The offset voltage is about 0 to 5 V, and when there is no oil leakage, the deviation signal is set to a value within the reference value.

In normal operation, the setting is made in consideration of the offset voltage, and the fuel consumption increases in proportion to the output of the generator 18, so that there is no problem in operation. Therefore, oil leakage can be detected regardless of the operation state, and fuel supply can be performed safely and reliably. This solves the conventional problems.

In the present embodiment, the description has been given of a configuration in which the level deviation of the first and second electric signals is minimized in a normal state and increases when an oil leak is detected. However, the magnitude relation between the level deviations is opposite. Is also good.

Further, according to the present invention, oil leakage can be detected if the relationship between the fuel consumption and the generator output can be quantified. Therefore, the present invention is also applied to the prime mover 21 in which the output return fuel pipe 23 does not exist. be able to.

[0021]

As described above, the oil leakage detection device of the present invention detects the occurrence of oil leakage in the fuel supply system by detecting an abnormal increase in fuel consumption in the power generation facility. Even if there is an oil leak at the point, the oil leakage can be reliably detected, and more secure maintenance of the power generation equipment becomes possible. Also, unlike the related art, there is no need for an oil stopper or an oil leakage receiving box, so that space can be saved.

Furthermore, the amount of oil leakage that can be detected can be arbitrarily adjusted by setting the alarm setting device, so that oil leakage can be accurately detected according to the application, and sudden stoppage of the prime mover is prevented before it happens. Is done.

The oil leakage detection device according to the present invention can also detect abnormal consumption in the prime mover, so that the performance check of the prime mover can also be performed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an oil leakage detection device according to an embodiment of the present invention.

FIG. 2 is a schematic explanatory view of a conventional oil leakage detecting means.

[Explanation of symbols]

 10, 11: Flowmeter with pulse oscillator (FM) 12, 13, Frequency / transformation converter (F / V) 14, 15, Subtractor 16: Power converter 17: Alarm setting device 18: Generator 20: Fuel service Tank 21… Motor 22, 23… Piping

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G08B 21/00

Claims (3)

(57) [Scope of request for utility model registration] 1. An apparatus for detecting oil leakage when supplying fuel to a power generation facility, wherein the power generation facility consumes the fuel in accordance with its output power. Fuel consumption detection means for converting the first power signal into a first electric signal representing fuel consumption; power conversion means for detecting output power of the power generation facility and converting the output power into a second electric signal representing the output power; Deviation signal output means for comparing the signal levels of the first and second electric signals and outputting a deviation signal between the two, and an alarm when a level deviation between the deviation signal and a preset reference value exceeds an allowable value An oil leak detection device comprising: a warning unit that outputs a signal. 2. The oil leakage detection according to claim 1, wherein the second electric signal is a signal obtained by adding a signal proportional to the output power of the power generation facility and a constant level offset signal. apparatus. 3. The oil leakage detection device according to claim 1, wherein the reference value is arbitrarily adjustable.