JPH0264318A - Safety device - Google Patents

Abstract

PURPOSE:To prevent a fuel from flowing out from an auxiliary tank even if one of two water level sensors has a trouble and enable a safety of a safety device to be attained by a method wherein two water level sensors are installed within the auxiliary tank and contact points of the two water level sensors are connected in series. CONSTITUTION:It is detected that liquid fuel within an auxiliary tank 5 is less than a first set water level 8 by a first water level sensor 10, a sucking pump 6 is operated and liquid fuel of a fuel tank 4 is passed through a fuel pipe 7 and sucked into an auxiliary tank 5. As liquid fuel within the auxiliary tank 5 exceeds a required amount of fuel, the first water level sensor 10 detects that it is more than a set water level 9 and the sucking pump 6 is stopped. If the first water level sensor 10 has a trouble, the water level is sensed by a third set water level 11 at an upper part of the second set water level 9, a contact point 20 is turned off with the second water level sensor 12 and the sucking pump 6 is stopped. At this time, the second water level sensor 12 is not automatically returned, so that an abnormal state can be acknowledged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a safety device for a combustion device that gasifies and burns liquid fuel.

(Prior Art) Conventionally, hot air heaters that perform heating by circulating hot air indoors have been well-received as clean and comfortable combustion devices. This type of hot air heater has a good reputation as a combustion device. This type of hot air heater takes in air for combustion from outside using a fan and releases it outside. On the other hand, since combustion heat is extracted from the indoor air through a heat exchanger, IC can be obtained without polluting the indoor air. For this reason, when installed at -degrees, it is often left as it is even when the season changes, causing inconveniences such as making the living space feel small. To address this issue, we developed a thin, wall-mounted hot air heater that saves space and is now being seen mainly in gas-fueled devices.

When the fuel is gas, the gas is supplied from the outside at a constant pressure like city gas, so a reduction in thickness can be easily achieved without the need for a fuel tank. However, in the case of liquid fuel, space for the fuel tank (cartridge tank) becomes an issue, making it difficult to achieve a thin design.

Therefore, in combustion devices such as hot air heaters that use liquid fuel, the fuel tank is placed outside the combustion device main body, and an auxiliary tank is installed inside the combustion device main body, and this auxiliary tank and the fuel tank outside the combustion device main body are connected. The combustion device is made thinner by connecting it with a fuel pipe and using a pump to send the liquid fuel from the combustion tank to the auxiliary tank for combustion.

In the above-mentioned combustion apparatus, liquid fuel is supplied from a fuel tank outside the combustion apparatus main body to an auxiliary tank inside the combustion apparatus main body, so a control device is required to control this supply. However, due to malfunction of this control device, leakage may occur from the liquid fuel tank, which may stain walls and floors and pose a risk of fire.

(Problem to be Solved by the Invention) As described above, in a conventional combustion device having a fuel tank outside the combustion device main body, leakage occurs from the liquid fuel tank due to failure of the control device, etc., and this leakage causes walls and There was a risk of staining the floor and causing a fire.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a safety device that is thin and can prevent fuel leakage.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the safety device of the present invention energizes both ends of an auxiliary tank provided in a combustion device main body below a first set water level of the auxiliary tank, Two water level detectors are provided: a first water level detector that cuts off power above the second set water level, and a second water level detector that cuts off power above the third set water level of the auxiliary tank and does not automatically return. , characterized in that a contact point of the first water level detector and a contact point of the second water level detector are connected in series with a power source of a pumping pump.

(Function) With this configuration, two water level detectors are installed in the auxiliary tank, and the contacts of these two water level detectors are connected in series, so that if one of the water level detectors fails, However, it can prevent fuel from leaking from the auxiliary tank to the outside, increasing safety. Furthermore, by providing water level detectors at both ends of the auxiliary tank, it is possible to detect the tilt, vibration, etc. of the combustion apparatus main body, and it is possible to reliably prevent fuel leakage.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure is a schematic diagram of a combustion device incorporating a safety device according to an embodiment of the present invention. In the figure, a combustion device main body 1 is fixed to the surface of a wall 2 via a metal fitting 3. This combustion device main body IK includes an auxiliary tank 5 for storing liquid fuel in the combustion device main body 1 from a fuel tank 4 outside the combustion device main body 1, and a pump pump for supplying liquid fuel from the fuel tank 4 to this auxiliary tank 5. 6, and the pump 6 and the fuel tank 4 are connected by a fuel vibrator 7.

The longitudinal direction of the auxiliary tank 5 is energized when the water level falls below the first set water level 8 in the sectional view of FIG.
A first water level detector 10 which shuts off when the water exceeds a third set water level 11fi- is installed, and a second water level detector 12 which shuts off when the water exceeds a third set water level 11fi and does not automatically return. As can be seen from FIG. 2, there is a second set water level 9 above the first set water level 8, and further above the second set water level 9 there is a third set water level 11.

Further, the liquid fuel in the auxiliary tank 5 is transferred to the main fuel pump 1.
3 to a vaporizer 14, which gasifies the liquid fuel and sends it to a liquid fuel combustor (burner) 15.

The control circuit section 16 of the safety device includes the aforementioned auxiliary tank 5, pump pump 6, fuel pipe 7, first water level detector 10.
Second water level detector 12, main fuel ho.

The pump 6 is configured to be controlled by information from a first water level detector 10 and a second water level detector 12 of a fuel supply section 17 that includes a pump 13, a carburetor 14, and the like.

Next, the control circuit section 16 will be explained.

FIG. 3 is a schematic diagram showing the configuration of a control circuit section and a fuel supply section of a liquid fuel combustor according to an embodiment of the present invention. In the figure, the auxiliary tank 5KG of the fuel supply section 17 is the first
The first water level detector 10 is energized when the set water level is 8 or below and is cut off when the second set water level is 9 or above. Water level detectors 12 are arranged at both ends of the auxiliary tank 5 in the longitudinal direction.

Further, the auxiliary tank 5 is provided with a pump pump 6 for supplying liquid fuel from the fuel tank 4 and a main fuel pump 13 for supplying the liquid fuel to the vaporizer 14. In this embodiment, the pump 6 is provided on the side of the auxiliary tank 5, but 1. Without being limited thereto, as shown in FIG. 4, a schematic diagram showing the configuration of a control circuit section and a fuel supply section of a liquid fuel combustor according to a modified example of the present invention, the fuel tank 4 side outside the combustion apparatus main body 1 It may be set in

The control circuit section 16 is a power source 18 for the pump pump 6.
, the contact 19 of the first water level detector and the contact 20 of the second water level detector, the contact 19 of the first water level detector and the contact 20 of the second water level detector are It is connected in series to the power source 18. In addition, the first
The contact 19 of the water level detector is normally cut off and does not drive the pump 6. The contacts 20 of the second water level detector are normally energized.

Next, we will explain the operation of an embodiment of the present invention with the above configuration.If the auxiliary tank 5 of this combustion device has more than the required amount of liquid fuel (contains more than the first set water level of 8), this combustion To use the device, turn on the switch (not shown).
When the fuel pump 13 is turned on, the main fuel pump 13 operates and sends the liquid fuel in the auxiliary tank 5 to the vaporizer 14. A vaporizer 14 gasifies the liquid fuel into vaporized fuel, and a liquid fuel combustor (burner) 1
5 and mixes with air in this liquid fuel combustor 15 to create an air-fuel mixture. This air-fuel mixture is ignited by an ignition device (not shown) downstream of the liquid fuel combustor 15 to form a flame (-secondary flame). Then, this secondary flame is mixed with secondary air and combusted at the most downstream side of the liquid fuel combustor 15.

The heat generated by this combustion is exchanged with a heat exchanger (not shown) and hot air is supplied indoors by a fan eK.

As the above combustion operation is performed, the liquid fuel is used for combustion, so the liquid fuel in the auxiliary tank 5 decreases, and the liquid fuel in the auxiliary tank 5 becomes less than the required amount (first set water level 8). . At this time, the first water level detector 10 detects that the first set water level is 8 or less, and the contact 19 of the first water level detector of the control circuit section 16 is energized to pump up the current from the power source 18.

The liquid fuel in the fuel tank 4 outside the combustion apparatus main body 1 is pumped into the auxiliary tank 5 through the fuel pipe 7 by operating the pumping horn 6, and this liquid fuel is used for combustion.

The liquid fuel in the fuel tank 4 is supplied into the auxiliary tank 5 by the pump 6, and when the liquid fuel increases and the liquid fuel in the auxiliary tank 5 exceeds the required amount (second set water level 9), the first water level is increased. When the detector 10 detects that the water level is equal to or higher than the set water level 9, the contact 19 of the first water level detector of the control circuit section 16 is cut off, and the pump 6 is stopped. This stoppage can prevent liquid fuel from overflowing from the auxiliary tank 5.

The supply of liquid fuel to the liquid fuel combustor 15 continues until the operation of the combustion device is stopped, and the above-mentioned operation is repeated every time the liquid fuel level in the auxiliary tank 5 falls below the first set water level 8. It will be done.

In the event that the first water level detector g310 fails in the direction that energizes the contact 19 of the first water level detector, the water level of the liquid fuel in the auxiliary tank 5 will rise and reach the second set water level 9.
Even if this happens, the current continues to flow through the pump 6 because the first water level detector 10 is out of order.
The pump 6 remains in operation, and the water level of the liquid fuel continues to rise. However, the second set water level is detected at the third set water level 11 set higher than the second set water level 9.
The liquid fuel is detected by the water level detector 12 at the third set water level 11.
It is detected that the water level has exceeded the water level, the contact 20 of the second water level detector of the control circuit section 16 is cut off, and the pump 6 is stopped. This stoppage can prevent the water level of the liquid fuel from rising before it overflows from the auxiliary tank 5. At this time, even if the water level of the liquid fuel in the auxiliary tank 5 drops from time to time, the second water level detector 12 does not automatically return to its normal state, so an abnormality can be detected and the safety of the equipment can be maintained.

Further, the first water level detector lO described above is located at one longitudinal end of the auxiliary tank 5, and the second water level detector 12 is located at one end of the auxiliary tank 5 in the longitudinal direction.
By providing the combustion device at the other end in the longitudinal direction, an abnormality can be detected even if the combustion device main body l is installed in an inclined state. 5 and 6 are plan views showing an auxiliary tank incorporating a safety device according to an embodiment of the present invention.

As shown in FIGS. 5 and 6, a first water level detector 10 is installed at one longitudinal end (the right end in this figure) of the auxiliary tank 5.
However, a second water level detector 12 is installed at the other longitudinal end of the auxiliary tank 5 (the left end in this figure).

When the auxiliary tank 5 is installed downward to the right as shown in FIG. detects the water level, disconnects the contact 19 of the first water level detector of the control circuit section 16, and prevents the water level of the liquid fuel in the auxiliary tank 5 from rising. can prevent leakage. In addition, if the auxiliary tank 5 is installed downward to the left as shown in the sixth section, when the liquid fuel reaches the third set water level 11 or higher, the second water level provided at the other end in the longitudinal direction The detector 12 detects the water level, and the contact 20 of the second water level detector in the control circuit section knee
Since the water level of the liquid fuel in the auxiliary tank 5 can be prevented from rising, leakage of the liquid fuel from the auxiliary tank 5 can be prevented. In addition, even when the device vibrates due to an earthquake or the like, the shaking of the liquid level can be detected by using a first water level detector 10 provided at one longitudinal end of the auxiliary tank 5 or a first water level detector 10 provided at the other longitudinal end. Detected by one or both of the second water level detectors 12, and disconnected one or both of the contacts 19 of the first water level detector or the contacts 20 of the second water level detector of the control circuit section 16. Therefore, the liquid fuel in the auxiliary tank 5 can be prevented from flowing out, and an abnormality can be notified.

〔Effect of the invention〕

According to the present invention, two water level detectors are provided in the auxiliary tank, and the contacts of these two water level detectors are connected in series, so that even if one of the water level detectors malfunctions, the water can be transmitted from the auxiliary tank to the outside. It is possible to prevent fuel leakage and improve safety.

Furthermore, by providing water level detectors at both ends of the auxiliary tank, it is possible to detect the tilt, vibration, etc. of the combustion apparatus main body, and it is possible to reliably prevent fuel leakage.

[Brief explanation of the drawing]

@ Figure 1 is a schematic diagram of a combustion device incorporating such a safety device according to an embodiment of the present invention, Figure 2 is a sectional view showing the set water level of an auxiliary tank according to an embodiment of the present invention, and Figure 3 is a schematic diagram of a combustion device incorporating such a safety device. A schematic diagram showing the configuration of a control circuit section and a fuel supply section of a liquid fuel combustor according to an embodiment of the present invention, FIG. 5 and 6 are plan views showing an auxiliary tank incorporating a safety device according to an embodiment of the present invention. 1... Combustion device main body, 4... Science tank, 5...
・Auxiliary tank, 6... Sump pump, 7.
...Fuel pipe, 8...First set water level, 13
...Main fuel pump, 14...Carburetor, 16...
Control circuit section, 17...Fuel supply section, 19...
Contact point of the first water level detector, 0... contact point of the second water level detector.

Claims (3)

[Claims] (1) In a combustion device equipped with a fuel tank provided outside the combustion device, an auxiliary tank provided inside the combustion device, and a pump that supplies fuel from the fuel tank to the auxiliary tank, a first water level detector that is energized in the auxiliary tank below a first set water level of the auxiliary tank and is turned off above a second set water level provided above the first set water level of the auxiliary tank; A safety device comprising: a second water level detector which shuts off at a level above a third set water level provided above the second set water level of the auxiliary tank and does not automatically return. (2) The first water level detector is installed at one longitudinal end of the auxiliary tank, and the second water level detector is installed at the other longitudinal end of the auxiliary tank. A safety device according to claim 1. (3) Safety according to claim 1, characterized in that the contacts of the first water level detector and the contacts of the second water level detector are connected in series with the power source of the pump. Device.