JPH0351636Y2 - - Google Patents

Description

[Detailed description of the invention] <Technical field> The present invention relates to a cartridge tank type combustion device such as an oil fan heater or a forced air supply/exhaust type heater.
In particular, it relates to a device that notifies the remaining amount of fuel or the possible combustion time.

<Prior art> In this type of combustion device, there is a known technology that notifies the remaining amount in the cartridge tank in several stages, but there is no technology that provides detailed digital display that is nearly stepless. do not. Also, there is no technology to detect the amount of fuel using an inexpensive piezoelectric sensor.

<Purpose> Therefore, the present invention aims to provide a device that uses a piezoelectric sensor as a weight sensor to obtain the remaining fuel amount or burnable time.

<Example> FIG. 1 is a schematic diagram of the main parts of the combustion apparatus of the present invention.
In the figure, 1 is a cartridge tank for storing oil, 2 is a pump for sending oil, 3 is a vaporizer for vaporizing oil, and 4 is a Bunsen-type burner, where the oil is vaporized in vaporizer 3. Mix oil and gas with air and combust. That is, oil is supplied through the route of tank 1 → pump 2 → vaporizer 3 → burner 4 and is burned. This is a so-called oil vaporization combustion device.

Reference numeral 5 denotes an oil tray supported by guides 6, 6 so as to be movable up and down, and a cartridge tank 1 is removably set on the upper part of the tray, and oil is supplied thereto. Reference numeral 7 denotes a pump tray to which the pump 2 is attached, which includes the oil tray 5, first and second oil pipes 8,
9 and an oil feed joint 10. Therefore, the oil level in each saucer 5, 7 is the same,
The amount of oil sucked by the pump 2 is supplied from the cartridge tank 1 in a well-known manner. 10
a is an oil pipe that communicates the pump 2 and the carburetor 3; The vaporizer 3 vaporizes the oil sent by the pump 2 using the heat of the electric heater, and
It is ejected into the burner 4. Air is sucked into the burner 4 due to the edging effect caused by this jet and mixed to form a suitable amount of combustion gas, and the burner 4
Burns at the flame outlet.

Here, numeral 11 in the figure is a weight detection section using a piezoelectric sensor, which is one of the features of the present invention. As shown in FIG. 2, this detection section 11 is constructed of a cylindrical holder 12, a knob 13 fitted with a groove at its upper end so as to be movable up and down, and an inner step 12a of the holder 12. It consists of a piezoelectric sensor 14. This piezoelectric sensor 14 has a piezoelectric ceramic 16 adhered to the upper surface of a metal plate 15, and the protrusion 13a of the knob 13 is in contact with the upper surface. This piezoelectric sensor 14 is distorted in proportion to the magnitude of the force applied via the knob 13, and a voltage is generated in proportion to the distortion. Therefore, by taking out this voltage via the lead wires 17, 17, the weight placed on the knob 13 can be measured.

Next, the circuit for obtaining the weight from the piezoelectric sensor 14 is connected to the third circuit.
This will be explained using figures. In the figure, reference numeral 18 denotes a detection circuit that detects the output voltage of the piezoelectric sensor 14 based on instructions from the microcomputer 19, converts it into a digital signal using a comparator, etc., and outputs it to the microcomputer 19. The piezoelectric sensor 14 is connected in parallel with a capacitor 20 constituting a low-pass filter and a discharging resistor 21 of this capacitor 20, and an FET 2 whose output is connected to the detection circuit 18.
Connected to gate 2. In addition, 23 is a normally open type reset switch, which is turned on only when a reset signal is output from the microcomputer 19, and the capacitor 20 is turned on.
discharge the electric charge.

The microcomputer 19 issues a reset signal when the reset button 24 is pressed, and thereafter stores the weight and performs calculations to be described later in accordance with the program. 25 is a pump drive circuit that operates the oil feed pump 2 according to instructions from the microcomputer 19, and 26 is a display device that displays the remaining amount of fuel and the available combustion time.

The operation of the device of the present invention will be described below with reference to the flowchart shown in FIG.

Now, if you remove the cartridge tank 1 from the oil pan 5, fill it with oil, and press the reset button 24, a reset signal will be output from the microcomputer 19 for a moment, the reset switch 23 will be turned on for a moment, and the piezoelectric sensor 11 and capacitor 20 will be turned on. The charges accumulated in the discharge resistor 21 are discharged. Therefore
The gate voltage of the FET 22 becomes zero [V], and a constant voltage is generated at the output resistor 27. This voltage is determined by the detection circuit 18 by a control signal from the microcomputer 19.
is detected and stored in the microcomputer 19 as A[V]. Next, when the filled cartridge tank 1 is set in the oil pan 5, an electric charge is generated in the piezoelectric sensor 11, a voltage appears in the capacitor 20, the voltage of the output resistor 27 increases, and this voltage is also transmitted from the microcomputer 19. The detection circuit 18 detects the control signal and stores it in the microcomputer 19 as B [V]. At this stage, the microcomputer 19 (B-A-
C) and D are calculated to determine the amount of kerosene to be supplied (≒residual oil amount), and the display device 26 is operated to display it. Furthermore, (B-A-C).D/F is calculated to determine the combustion operation possible time and the display device 26 is operated to display it.

However, C: Voltage equivalent to the weight of the cartridge tank 1 itself D: Coefficient for converting voltage to kerosene weight (determined by model) F: Voltage equivalent to the weight of kerosene consumed per unit time (pump unit time By the way, the kerosene in the cartridge tank 1 (≒
The amount of residual oil) is sucked into the pump 2 through the oil receiving tray 5, oil sending pipe 8, oil sending joint 10, oil sending pipe 9, and pump receiving tray 7 by the operation of the combustion device, and then is sucked into the pump 2 through the oil receiving tray 5, the oil sending pipe 8, the oil sending joint 10, the oil sending pipe 9, and the pump receiving tray 7.
After that, it is consumed by burner 4 and decreases. However, since the suction speed of the pump 2 is constant and the pump 2 is operated by operating the pump control circuit 25 in response to a signal from the microcomputer 19, it is easy to count the operating time of the pump 2 using the microcomputer 18. Therefore, it is easy to calculate the amount of kerosene consumed, and the amount of remaining oil and the possible combustion operation time can be calculated and displayed at regular intervals.

Remaining oil amount = (B-A-C)・D-(F・H) Combustion operation possible time = {(B-A-C)・D-(F・H)}/F However, H: Pump operation time (after setting the oil tank).

<Effects> According to the present invention, the oil tray itself in which the cartridge tank is set is made vertically movable, and the displacement of this oil tray is detected by a piezoelectric sensor.
With a simple structure, the amount of fuel in the cartridge tank can be determined with high accuracy.

In addition, if you want to accurately detect the amount of fuel by placing the cartridge tank itself in contact with a piezoelectric sensor, you must contact the piezoelectric sensor near the center of the cartridge tank, that is, near the oil outlet. , which is structurally extremely difficult. For this reason, it is possible to place a piezoelectric sensor in contact with the bottom edge of the cartridge tank, but this would result in measuring an uneven position, and the well-known valve spring of the fuel filler cap would affect the measurement, making detection difficult. There are disadvantages such as inaccuracy.

[Brief explanation of the drawing]

Figure 1: Schematic diagram of the combustion device of the present invention using a piezoelectric sensor. Figure 2: Structural diagram of a weight detection section using a piezoelectric element as a sensor. Figure 3: Circuit diagram of the main parts of the device of the present invention. FIG. 4: Flow chart for explaining the operation of the present invention. Code, 1: Cartridge tank, 2: Pump,
14: piezoelectric sensor, 16: piezoelectric ceramics,
19: Microcomputer, 26: Display section.

Claims (1)

[Scope of Claim for Utility Model Registration] In a combustion device that burns fuel supplied from a removable cartridge tank in a combustion section, an oil tray that communicates with the combustion section and is supported vertically by a guide; A cartridge tank that is removably set on the top of the oil pan and supplies oil to the oil pan when set; a knob that changes according to the weight of the oil pan in which the cartridge tank is set; a weight sensing section comprising a piezoelectric sensor that is in contact with the piezoelectric sensor and generates a voltage according to the displacement; and means for calculating and displaying the remaining amount of fuel or burnable time based on the output from the weight sensing section. A combustion device comprising: