JPH0518590Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a liquid fuel combustion device having a fuel reservoir, and particularly to a residual oil amount detection device for detecting the amount of residual oil in the fuel reservoir.

[Conventional technology]

Conventionally, in this type of liquid fuel combustion device, the remaining oil level confirmation means included an oil level gauge attached to the bottom of the oil tank, or a float switch that detected the fuel level in the oil pan. .

[Problem that the invention attempts to solve]

However, oil level gauges are very difficult to see due to their limited mounting locations.
Moreover, since only a portion of the inside of the tank could be seen, it was not necessarily suitable for checking the amount of remaining oil.

In addition, while those equipped with a float switch can display the detection status in a relatively easy-to-read manner on a display mounted at any position, the display can be displayed only by turning the switch on and off.
Since it is based on value information, the amount of remaining oil could not be confirmed until the fuel in the oil tank ran out or was on the verge of emptying.

As described above, with the conventional residual oil amount detection device, the range in which the amount of residual oil can be confirmed is limited. For this reason, there were problems such as the inability to estimate the next refueling time by looking at the process of fuel consumption.

This device is an improvement on Utility Model Application No. 1983-7815, which was filed by the same applicant in order to solve this problem.It protects the weight sensor from large loads and ensures that the detection output is always accurate. The object of the present invention is to obtain a residual oil amount detection device for a liquid fuel combustion device that yields the desired amount of oil.

[Means for solving problems]

The residual oil amount detection device for a liquid fuel combustion device according to this invention is equipped with a weight sensor that detects the amount of residual oil by detecting the weight of a fuel storage part, and the weight sensor is arranged vertically at a predetermined interval. a pair of actuators installed opposite each other in the direction; and a pair of actuators arranged between the actuators, both ends of which are fixed to opposite ends of the pair of actuators, and facing the other free end of the actuator with a predetermined gap. The strain plate is made up of a strain plate with a strain plate and a resistance wire strain gauge attached and fixed to the strain plate, and the gap is set within the allowable deformation of the strain plate.

[Effect]

With the above-mentioned configuration, even if a very large force is applied to the weight sensor, the strain plate is deformed only by the gap, so that no permanent deformation remains in the strain plate, and therefore the amount of remaining oil is always detected accurately.

〔Example〕

Hereinafter, preferred embodiments of this invention will be described based on the drawings.

FIG. 1 shows the internal structure of a liquid fuel combustion apparatus employing this invention, FIG. 2 is a block diagram of the residual oil amount detection circuit, and FIGS. 3 and 4 are diagrams for explaining the operation of the weight sensor.

First, in Fig. 1, 1 is an airtight oil tank, 2 is an oil level gauge, 3 is an oil pan, 4 is a weight sensor, 8 is a bottom plate, 9 is a combustor, 10 is a fuel pump,
11 is a blower, 12 is a combustion chamber, 13 is a blower fan, 14 is an outer case, and 17 is an oil supply pipe connecting the oil pan 3 and the fuel pump 10.

In the above, liquid fuel such as kerosene is stored in the oil tank 1.

The oil tank 1 is configured to be detachable from the main body. The oil pan 3 stores fuel supplied to the combustor 9 at a constant level. The fuel in this oil pan 3 is automatically replenished from the oil tank 1 using the pressure difference, and the oil tank 1 and oil pan 3 constitute a fuel storage section.

The weight sensor 4 includes a pair of actuators 5a, which are vertically disposed opposite to each other with a predetermined interval.
5b, and a strain plate disposed between the actuators, with opposite ends thereof fixing one end of the pair of actuators 5a, 5b, respectively, and facing the other free end with a predetermined gap a. 6, and a resistance wire strain cage 7 attached and fixed to the strain plate 6 via a mount.

This weight sensor 4 is provided between the oil pan 3 and the bottom plate 8, and is connected to the strain plate 6 and the actuator 5.
The total weight of the oil pan 3 and the oil tank 1 above it is detected via a and 5b.

The gap a between the unfixed free ends of the actuators 5a and 5b and the strain plate 6 did not come into contact under the load when the oil tank 1 was filled with fuel and set, and a larger load was applied thereto. At times, as shown in FIG.
It is set in advance within the allowable deformation so that the free ends of a and 5b come into contact with each other.

The operation of the device having the above configuration will be explained below.

Actuators 5a and 5b transmit the loads of oil tank 1 and oil pan 3 to strain plate 6. When the strain plate 6 is distorted by this transmitted load, an electrical signal that changes according to this distortion is output from the resistance wire strain gauge. Since the total weight of the oil tank 1 and the oil pan 3 is determined in advance, the weight sensor 4 provides a detection output regarding the total weight of the fuel stored in the oil tank 1 and the oil pan 3, respectively.

As shown in FIG. 2, the detection output of the weight sensor 4 is subjected to processing such as amplification and bias correction by a signal processing circuit 15, and is then provided to an indicator 16, which is a type of analog display. The display panel of the indicator meter 16 is provided with a scale and characters that indicate the input level as an oil amount. The mounting position of this indicator meter 16 can be freely selected. Therefore, the liquid fuel combustion device can be mounted at any easily visible position. As a result, the total amount of liquid fuel remaining in the oil tank 1 and oil pan 3 is displayed in an easy-to-read manner, regardless of the amount.

By the way, when setting the oil tank 1, there is a risk that a large load may be applied to the weight sensor 4 depending on the setting method, and if such a large load is suddenly applied, the strain plate 6 may be permanently damaged. Although distortion may occur, in this embodiment, the gap a between the free ends of the actuators 5a and 5b and the strain plate 6 is set within the allowable deformation of the strain plate 6, so that the permanent distortion is avoided. Even if such a large load is applied, the strain plate and the free ends of the actuators 5a and 5b come into contact with each other before the full load is applied to the strain plate 6, thereby suppressing the application of more load than necessary to the strain plate 6. Therefore, the detection output from the strain gauge can always be accurate.

[Effect of idea]

As described above, this idea was developed by adjusting the gap between the strain plate and the free end of the actuator in a weight sensor that detects the amount of remaining oil by detecting the weight of a part where liquid fuel is stored, such as an oil tank. Since it is set within deformation, a large load that would cause permanent deformation is not applied to the strain plate at any time, so it is possible to accurately detect the amount of residual oil without distorting the detection output.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the internal configuration of a liquid fuel combustion device according to an embodiment of this invention, Fig. 2 is a block diagram of the residual oil amount detection circuit, and Figs. 3 and 4 are diagrams explaining the operation of the weight sensor. be. In the figure, 1 is an oil tank, 3 is an oil pan, 4 is a weight sensor, 5a and 5b are actuators, 6 is a strain plate, 7 is a resistance wire strain gauge, and a is a gap.

Claims (1)

[Scope of utility model registration request] In a device equipped with a weight sensor that detects the amount of remaining oil by detecting the weight of a fuel storage section in which liquid fuel is stored, the weight sensor includes a pair of sensors installed vertically facing each other with a predetermined interval. an actuator, a strain plate disposed between the actuators, having both ends fixed to opposite ends of the pair of actuators and facing the other free end of the actuator with a predetermined gap; and the strain plate. 1. A residual oil amount detection device for a liquid fuel combustion device, comprising a resistance wire strain cage affixed and fixed to the strain plate, and wherein the gap is set within an allowable deformation of the strain plate.