JPH0473515A - Kerosene space heater - Google Patents

Abstract

PURPOSE:To avoid the danger of fire by a simple construction by detecting an abnormal fuel flow-in into a receiving pan by the rise of the fuel level in it and letting a control circuit carry out automatical shutoff by the detection signal. CONSTITUTION:When a certain volume of fuel is filled in a receiving pan 2, a float 23 rises along the fuel surface as shown by the solid line 10a and a lead switch A22a acts to open the contact point. This signal is sensed by a microcomputer and the operation is started. When the fuel in a fuel tank 1 is used up, the float 23 descends with the fuel surface and closes the contact point of the lead switch A22a, and the microcomputer lights a supply oil lamp. When the fuel flows abnormally into the receiving pan 2 and the fuel surface rises abnormally to, for instance, the two-dot chain line 10c, the float 23 ascends and a lead switch B22b acts to open the contact point, and the microcomputer stops the combustion operation if the device is in combustion operation and, if it is before the start of the combustion operation, the operation shifting to the combustion operation is prohibited.

Description

[Detailed description of the invention] [Industrial application field] This invention applies to oil heaters.

[Prior Art] Figure 4 is a sectional view showing the general structure of an oil heater. In the figure, (1) is a fuel tank, (2) is an oil pan, and (3) is a fuel tank.
is a pump, (4) is a constant oil leveler, (5) is a blower fan, (
6) is a casing, (7) is a fuel pipe, (8) is a nozzle, ku) is a carburetor, and (20) is a fuel monitoring sensor.

Figure 5 shows the fuel monitoring sensor (2) in a conventional kerosene heater.
0) is a cross-sectional view showing an example of the configuration of (1θa
) is the normal oil level in the oil pan (2), (10b)
The dashed line indicates the oil level in the oil pan (2) when the oil runs out, (21) indicates the same cylinder as the sensor, (22) indicates the reed switch,
(23) is a float, and (24) is a magnet.

The fuel monitoring sensor (20) is for monitoring the amount of fuel in the oil pan (2), and inside the sensor tube (21) is a reed switch (22) that opens and closes the contact depending on the presence or absence of a magnetic field.
), and a ring-shaped float (23) is built into the outer periphery of the sensor cylinder 21) so that it can slide up and down, and a magnet (24) is fixed to the tip of this float (23). There is.

As shown in FIG. 5, a float (23) is floating on the oil surface and slides on the sensor tube (21) in the direction shown by the arrow in the drawing as the oil surface changes. And oil pan (2)
When the fuel in the tank falls below a certain level and reaches the oil-out condition shown in (10b), the reed switch (23) is activated by changes in the magnetic field to close the contacts and send a signal. .

Fig. 6 is a diagram showing a control circuit provided in a conventional oil heater. In the figure, (22) is a fuel monitoring sensor (20).
) reed switch, (25) is a control board, and (26) is a microcomputer (I c
) -<27) indicates a power switch.

Next, the operation will be explained. As shown in Figure 4, by installing the fuel tank (1) in the oil pan (2), the oil pan (2) can be installed.
The valve of the fuel tank (1) is opened by the pin provided in the oil pan (2), and the fuel inside flows into the oil pan (2), and the valve of the fuel tank (1) (not shown) in the oil pan (2) is opened. Balance the oil level using the bottom end of the

When the oil pan (2) is filled with a certain amount of fuel, the float (23) rises along the oil surface as shown by the solid line in Figure 5, and the reed switch (22) operates to open the contact. do.

When the reed switch (22) opens the contact, the microcomputer (26) senses this signal and starts operation.

First, the pump (3) operates, and the fuel in the oil pan (2) is pumped up to the leveling device (4).The fuel pumped up to the leveling device (4) is sent from the blower fan (5). The air is pushed up into the fuel pipe <7> by the wind pressure, atomized by the air flow sent through the casing (6) at the nozzle (8), and then transferred to the vaporizer (9), which is preheated by a heater. ), vaporizes in the vaporizer (9), mixes with air to become combustion gas, and burns in the burner head.

When the fuel in the oil pan (2) is sequentially pumped up by the pump (3) during combustion, the fuel sequentially flows from the fuel tank (1) into the oil pan (2), increasing the oil level in the oil pan (<2). However, when the fuel in the fuel tank (1) is used up, the oil level in the oil pan <2) will drop and the float (23) will fall along the oil level, causing the reed switch (2) to drop.
2) operates to close the contact.

This state of oil depletion is shown by the dashed line in FIG. 5 (10b).

The microcomputer (26) lights up a refueling lamp (not shown) based on the signal from the reed switch (22) to prompt refueling to the fuel tank (1), but if refueling is not performed within a certain period of time, The brocrum is activated and automatically extinguishes the fire.

[Problem to be solved by the invention] The conventional kerosene heater as described above is constructed and operated as described above, but the temperature of the fuel tank rises during combustion operation and the air inside the fuel tank is heated. If pressure is applied or if the airtightness of the fuel tank cannot be ensured, fuel may abnormally flow into the oil pan and overflow from the oil pan, causing the overflowing fuel to vaporize due to heat. There was a risk of a fire if the flames from the burner were ignited.

This invention was made in order to solve the above problem, and has a simple structure without impairing conventional functions, and is capable of avoiding the risk of fire caused by abnormal flow of fuel into the oil pan. The purpose is to obtain a heater.

"Means for Solving the Problems" The kerosene heater according to the present invention is provided with a detection means for detecting abnormal flow of fuel into the oil pan by a rise in the oil level, The signal activates the control circuit to automatically extinguish the fire.

[Function] The kerosene heater of the present invention is provided with a detection means that detects this by a rise in the oil level when fuel abnormally flows into the oil pan, and a control circuit is activated by a detection signal from this detection means. Since the system automatically extinguishes the fire, it is possible to prevent a fire from occurring even if fuel abnormally flows into the oil pan.

[Example] An example of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing the configuration of the fuel monitoring sensor (20) in this embodiment, and is a diagram corresponding to FIG. 5 of the conventional device, and the same reference numerals as in FIG. 5 indicate the same or equivalent parts, (22a> is a reed switch A for monitoring oil shortage, (22b) is a reed switch B for monitoring abnormal inflow of fuel, and a two-dot chain line in (10c) is an oil pan (2).
) shows the height of the oil level when fuel abnormally flows into the tank.

FIG. 2 is a diagram showing a control circuit in this embodiment, and corresponds to FIG. 6 in the conventional apparatus, and the same reference numerals as in FIGS. 1 and 6 indicate the same or corresponding parts.

The kerosene heater in this embodiment is shown in Fig. 1.

As shown in Figure 2, except for some changes to the fuel monitoring sensor (20) and control circuit program.
This is the same as a conventional oil heater, so a duplicate explanation will be omitted here.

Next, the operation will be explained. As shown in FIG. 2, at the start of operation, the contacts of reed switch B (22b) are closed, and in this state the heater operates in the same way as a conventional oil heater. That is, when the oil pan (2) is filled with a certain amount of fuel, the float (23) rises along the oil level as shown by the solid line (10a> in Fig. 1), and the reed switches A and (22a) are activated. It operates and opens the contact. When reed switch A (22a) opens the contact, the microcomputer (26) senses this signal and starts operation. Then, combustion operation continues, and the inside of the fuel tank (1) is When the fuel is used up, the oil level in the oil pan (2) decreases, the float (23) descends along the oil level, and the reed switch A (22a) operates to close the contact. Based on the signal from this reed switch A (22a), the microcomputer (26) lights up a refueling lamp (not shown) to prompt refueling to the fuel tank (1), but if refueling is not done within a certain period of time, , the program will run and automatically extinguish the fire.

Also, the temperature of the fuel tank (1) rises during combustion operation,
If the air in the fuel tank (1) becomes pressurized or due to time-related factors, for example, a hole forms in a part of the fuel tank (1), the airtightness of the fuel tank (1) is no longer maintained. In this case, fuel may abnormally flow into the oil pan (2) and may overflow from the oil pan (2). In such a case, conventional kerosene heaters continue to burn, and there is a risk that the overflowing fuel will vaporize due to the heat and ignite, causing a fire.

In order to avoid the above-mentioned dangers, the kerosene heater in this embodiment prevents fuel from flowing into the oil pan (2) abnormally and causing the oil level to become abnormal as shown by the two-dot chain line (10c) in Figure 1. When it rises, the float (2
3) rises, reed switch B (22b) operates and opens the contact. The microcomputer (26) operates a program based on the signal from this reed switch B (22b), and stops the combustion operation if it is in the combustion operation, and stops the transition to the combustion operation if it is before the combustion operation starts. conduct,
Even if fuel abnormally flows into the oil pan (2), actions are taken to avoid the risk of a fire occurring.

Note that in the above embodiment, under normal conditions, the reed switch B (
22b) is in a closed state, and in the event of an abnormality, it is in an open state, but
Depending on the microcomputer program, it may be in an open state during normal times and a closed state in abnormal situations.

FIG. 3 is a sectional view showing another embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate the same or corresponding parts;
30) is an oil receiver, (31) is an oil pipe, and (32) is an optical sensor. As shown in FIG. 3, this embodiment uses a fuel monitoring sensor (20) to detect abnormal inflow of fuel into the oil pan (2).
) is installed separately from the optical sensor (32), which is an effective configuration when the float (23) cannot have a sufficient sliding distance due to the shape of the fuel tank (1). It can be done.

Effects of the Invention As described above, this invention is provided with a detection means that detects this by a rise in the oil level when fuel abnormally flows into the oil pan, and a control circuit is activated by a detection signal from this detection means. Since the system is operated to automatically extinguish the fire, it is possible to obtain a safe device that can avoid the occurrence of a fire even if fuel abnormally flows into the oil pan.

[Brief explanation of drawings]

1 and 2 are diagrams showing one embodiment of this invention, FIG. 3 is a diagram showing another embodiment of this invention, FIG. 4 is a diagram showing a schematic refinement of a kerosene heater, and FIG. 5 and 6 are diagrams showing conventional devices. In the figure, (2) is the oil pan, (10a) is the oil level height under normal conditions, (10b) is the oil level height when the oil runs out, and (10
c) is the height of the oil level at the time of abnormal inflow, (21) is the sensor cylinder, (22a) is the reed switch A, (22b) is the reed switch B, 23) is the float, (24) is the magnet, (
25) is the control board, (26) is the microcomputer, (27) is the power switch, (30) is the oil receiver, (pull) is the oil pipe,
(32) is an optical sensor. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] An oil pan that is supplied with fuel from a fuel tank, a fuel monitoring sensor installed on the oil pan that monitors the amount of fuel in the oil pan, and a control circuit that controls the operation of the oil pan. When the amount of fuel in the saucer drops below a certain level, this is detected by the fuel monitoring sensor, which emits a signal.The control circuit receives this signal and operates automatically. In a kerosene heater for extinguishing a fire, if fuel abnormally flows into the oil pan, a detection means detects this by a rise in the oil level in the oil pan, and the control circuit receives a detection signal from the detection means. An oil heating machine characterized in that it is equipped with a means for automatically extinguishing a fire when fuel abnormally flows into the oil receiving tray.