JP4109699B2 - Liquid fuel combustion equipment - Google Patents

Description

  The present invention relates to a liquid fuel combustion apparatus such as an oil fan heater.

  FIG. 9 is a partially omitted front sectional view schematically showing an example of a conventional oil fan heater. As shown in the figure, a conventional oil fan heater is provided with an oil supply tank 102 for pre-injecting and storing liquid fuel 104 such as kerosene on the inner side of the main body 101. A sufficient amount of liquid fuel 104 is supplied to a fuel tank 103 connected below the fuel tank 102.

  The liquid fuel 104 accommodated in the fuel tank 103 is guided to the vaporizer 107 via the oil feed pipe 106 by the fuel pumping electromagnetic pump 105. Here, the sent liquid fuel 104 is vaporized by a vaporizer heater (not shown) provided in the vaporizer 107. Reference numeral 109 denotes a combustion chamber, and a burner 108 is supported and fixed to the bottom of the combustion chamber.

  The fuel gas vaporized by the carburetor 107 is jetted vigorously from the nozzle, introduced into the burner 108 together with combustion air, and burned at the flame port 108a, whereby the air in the combustion chamber 109 is heated.

  Then, the indoor air sucked by the blower fan attached to the fan motor composed of a single-phase induction motor or the like provided on the back surface of the main body 101 is heated as hot air and combustion gas in the combustion chamber 109 as hot air from the outlet. It is blown into the room.

  By the way, in the conventional oil fan heater, in order to refuel the fuel tank, it is necessary to take it out of the main body and turn it over to turn the fuel cap upward. Because of the insertion, it is necessary to turn the fuel tank upside down again, which is cumbersome to handle.

  In view of the above-mentioned problems, the present invention eliminates the fuel tank that temporarily stores fuel, sends the fuel in the fuel tank directly to the combustion unit, and prevents the fuel filler cap of the fuel tank from getting wet by the fuel. In addition, an object of the present invention is to provide a liquid fuel combustion apparatus for eliminating the supply of water contained in the liquid fuel and accumulated in the fuel tank to the combustion section.

  In order to achieve the above object, the present invention comprises a fuel tank that is removably accommodated in a tank housing chamber in the apparatus body, and a combustion section that combusts fuel fed from the fuel tank, and temporarily stores the fuel. The fuel tank that accumulates fuel is abolished, the fuel in the fuel tank is sent directly to the combustion section, and a fuel filler port is provided on the upper surface side of the fuel tank to generate fuel. Water detection means for detecting water is provided to prevent water in the oil supply tank from being supplied to the combustion section by detecting water in the tank.

  In this case, the water detection means may be provided at any location of the tank, but in view of the physical properties or detection functionality of the fuel and water, a configuration provided on the bottom surface side of the tank is suitable.

  The water detection means includes a conductive water tray provided on the bottom surface of the conductive tank for collecting condensed water, an electrode that contacts the water tray, an electrode that contacts the fuel tank, a water tray and a fuel tank. The structure which detects the water by the difference of the electrical resistance value of the water and fuel which are stored in a water receiving tray and a fuel can be illustrated.

  In order to accurately detect water, the water tray is preferably formed separately from the tank and attached to the mounting hole on the bottom surface of the tank via an electrical insulator. The material is composed of a conductive material, but using a stainless steel plate is preferable in that it can prevent the occurrence of rust.

  Examples of the electrical insulator include elastic non-conductive packing interposed between a peripheral wall of a hole formed in the bottom surface of the tank and the periphery of the water tray. If this packing is subjected to a water repellent treatment, it is difficult for water to accumulate even after draining, and malfunction can be prevented.

  It is preferable from the standpoint of electrode arrangement that the electrodes that are in contact with the water tray and the tank are installed on, for example, a tank mounting table outside the tank, and the water tray and the tank are in contact with the respective electrodes. In this case, a position where the water tray and the tank are closest to each other functions as a tip electrode, and water detection is performed based on a difference in resistance value of water or fuel stored during this time.

  At this time, a narrow needle portion with a sharp tip is provided in a part of the tank-side hole to which the water tray is attached, and this part functions as a tank-side tip electrode. By applying a conductive paint, water can be detected more accurately.

  Further, if guard means for guarding the water receiving tray is attached to the tank side to which the water receiving tray is attached, it is possible to prevent the water receiving tray from being scratched or dented when the tank is taken out from the main body and refueled.

  As described above, according to the present invention, the water detection means is provided on the bottom surface side of the fuel tank, and the operation state is controlled by the input signal from the water detection means, so that the usability can be improved.

  FIG. 1 is a schematic front view of a petroleum fan heater equipped with a liquid fuel combustion apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic view of the liquid fuel combustion apparatus.

  As shown in the figure, the oil fan heater main body 1 is formed in a box shape, and includes a front plate 2 that is detachably provided, a top plate 3 that is formed integrally with a side surface, and an operation that operates a driving operation. Part 4, an outlet 5 for blowing warm air, and an openable / closable lid 7 for taking in and out the fuel tank 6 on the upper right side of the top plate 3. It is placed and fixed on a table 8 that receives this when it leaks.

  As shown in FIGS. 1 and 2, the interior of the main body 1 includes a tank housing chamber 1 a for housing the fuel tank 6 and a functional component housing chamber for housing the vaporizer 12, the electromagnetic pump 13, and the like by the tank guide 11 and the partition plate 16. 1b and the combustion part chamber 1c in which the burner 14 and the combustion chamber 15 are arrange | positioned.

  In the tank storage chamber 1a, a removable cartridge-type fuel tank 6 for temporarily storing fuel, and an oil feed path 300 for feeding fuel from the fuel tank 6 to the vaporizer side and the fuel tank 6 are detachable. The oil supply side connection means 9 and 10 to be connected, and the return oil side connection means 21 and 22 for detachably connecting the return oil path 301 for returning the fuel gas from the vaporizer 12 side to the oil supply tank 6 and the oil supply tank 6 are provided. Has been placed.

  At the bottom of the tank housing chamber 1a, there is provided a mounting table 1d having a cushioning property that absorbs and relieves shock applied to the connecting means 9, 10 and 21, 22 when the fuel tank is housed. Further, a guide portion is formed in the tank accommodating chamber 1a so that the oil supply side connection means 9, 10 and the return oil side connection means 21, 22 are securely connected when the oil supply tank 6 is accommodated. It is preferable to keep it.

  The oil-feeding side connecting means includes an oil-feeding joint 9 incorporating a suction pipe and a valve that opens and closes the passage, and an oil-feeding joint receiver 10 that receives the valve of the oil-feeding joint 9. The oil feed joint receiver 10 is connected to an air valve 20 for taking air into the oil feed path in order to shut off the oil feed path 300 supplied from the fuel tank 6 to the electromagnetic pump (oil feed pump) 13. The oil feeding joint receiver 10 is attached to the wall surface of the tank guide 11 whose upper part protrudes toward the functional component storage chamber.

  The functional component storage chamber 1b is disposed between the tank storage chamber 1a and the combustion section chamber 1c, and includes a carburetor 12 that vaporizes fuel from the fuel tank 6, and fuel from the fuel tank 6 to the carburetor 12. , A storage container 18 for storing unburned gas from the vaporizer 12, and cooling fins 19 for cooling the unburned gas between the vaporizer 12 and the storage container 18 are accommodated.

  The combustion chamber 1c is partitioned by a partition plate 16, and a burner 14 that mixes and burns fuel gas vaporized by the vaporizer 12 and primary combustion air, a combustion chamber 15 that surrounds the burner 14 that burns, and a burner 14 And a burner box 17 that accommodates. A combustion section for combusting fuel is constituted by the vaporizer 12 and the burner 14.

  The oil feeding path 300 includes a pipe 203 that connects the oil feeding joint receiver 10 and the electromagnetic pump 13, and a pipe 204 that connects the electromagnetic pump 13 and the vaporizer 12. The return oil path 301 includes a pipe 205 that connects the vaporizer 12 and the cooling fin 19, a pipe 206 that connects the cooling fin 19 and the storage container 18, and a pipe 207 that connects the storage container 18 and the return oil joint receiver 10. . These pipes 203 to 207 are all formed of a copper pipe. In addition, piping from resin etc. other than a copper pipe may be used for piping from the oil supply tank 6 to the electromagnetic pump 13.

  FIG. 3 is a schematic view of a fuel tank, and FIG. 4 is a perspective view showing a connecting portion of the fuel tank. The fuel tank 6 is formed in a vertical box shape with a conductive metal material (for example, galvanized steel plate), and is installed on the upper surface of the tank for carrying fuel. A handle 23, an inclined surface 501 formed between the upper surface on which the handle 23 is provided and one side surface adjacent thereto, a fuel supply port 26 for supplying fuel disposed on the inclined surface 501, A closing means 600 for closing the oil supply port 26 so as to be freely opened and closed, an oil amount meter 25 provided on a side surface close to the oil supply port 26 to make it possible to visually recognize the state of fuel supply, and a handle 23 are provided. On the upper surface, an oil feeding joint 9 and a return oil joint 21 disposed on the side opposite to the oil filler 26 are provided.

  The oil feed joint 9 and the return oil joint 21 both have the valve bodies 31 and 32 of the joint body set downward and are disposed at the same level, and the oil feed joint receiver 10 is disposed facing upward and facing upward. And it connects with the return oil joint receiver 22 in the up-down direction. Therefore, the connecting means 9, 10 and 21, 22 can be smoothly connected only by mounting the fuel tank 6 from above the tank chamber 1a.

  5 is a cross-sectional view showing the configuration of the tank bottom, FIG. 6 is a cross-sectional view of the inside of the tank, and FIG. 7 is a perspective view of a water pan mounting hole on the bottom of the tank. As shown in the figure, in the fuel tank 6 of the present embodiment, a fuel amount detecting means 750 for detecting the amount of fuel in the fuel tank, and a water detecting means 800 for detecting dew condensation water generated in the fuel tank at the bottom of the tank. A tank mounting detection means 900 is provided for detecting the presence or absence of the main body mounting state of the fuel tank.

  The tank mounting table 1d has a leg portion 755 to be mounted on the mounting table 8 on the outer peripheral portion, the central portion protrudes downward, and an accommodation recess 754 of the water tray 801 that is recessed downward is formed on the upper surface side thereof. The outer peripheral portion is made of a synthetic resin which is a mounting surface 757 of the bottom surface 6 b of the tank, and the central convex portion 756 is fitted and mounted in the hole 8 a of the mounting table 8.

  The water detection means 800 includes a conductive water tray 801 provided on the bottom surface of the conductive tank for collecting condensed water, an electrode 802 that contacts the water tray 801, and an electrode that contacts the bottom of the fuel tank 6. 803, and a watertight packing 804 as an insulator that electrically insulates the water receiving tray 801 and the fuel tank 6 and detects water based on the difference in electrical resistance between the water stored in the water receiving tray 801 and the fuel. Have been to do.

  The water tray 801 is formed separately from the tank 6 using a stainless steel bowl to prevent the occurrence of rust, and the upper surface side has a dish-like shape, and the outer peripheral portion has a radial direction. A peripheral flange 807 extending outward is formed, and the flange 807 is attached to the bottom surface mounting hole 805 of the oil supply tank 6 via a rubber packing 804.

  The packing 804 is an elastic non-conductive material interposed between the peripheral wall of the bottom surface mounting hole 805 of the fuel tank 6 and the peripheral flange 807 of the water tray 801, and the flange 807 of the water tray 801 It is designed to be sandwiched from above and below. The packing 804 is fixed around the tank mounting hole 805 by a ring-shaped pressing member 809 and a screw 810 disposed on the lower surface thereof, whereby the water tray 801 is fixed to the mounting hole 805 in a watertight state.

  This rubber packing 804 is made of a non-conductive, oil-resistant and water-repellent rubber member, specifically, NBR (acrylonitrile butadiene rubber), which is excellent in oil resistance, and water repellency. Fluororubber is used. In particular, if the packing has poor water repellency, water accumulates and water remains in the packing and the metal part of the fuel tank 6 even after draining, which may cause malfunctions. Since a rubber material having a water content is used, accurate and accurate water detection becomes possible.

  Both the electrode 802 on the water tray 801 side and the tank side electrode 803 are attached to the tank mounting table 1d outside the fuel tank. The electrode 802 on the water receiving tray 801 side is a needle-like electrode that protrudes from the bottom wall of the water receiving tray receiving recess 754 toward the tank and contacts the outer surface of the water receiving tray 801 when the tank is placed. The tank-side electrode 803 is a needle-like electrode that is exposed to the outer peripheral mounting surface 757 of the mounting table 1d and contacts the bottom surface 6b of the tank in the tank mounting state. By connecting both electrodes to the power source, an electrical closed circuit is constructed from the power source to the water tray side electrode 802, the water tray 801, the fuel or water on the inner surface, the tank bottom surface 6b, the tank side electrode 803, and the power source. The presence of water can be detected by the difference in resistance value of the liquid (fuel or water) inside the water receiving tray 801.

  In order to improve the water detection accuracy, the hole wall of the mounting hole 805 on the tank side to which the water receiving tray 801 is attached is bent downward, and at a plurality of positions in the circumferential direction of the bent portion 811 with a small interval. A needle portion 812 having a width and a sharp tip is formed to protrude downward. The needle portion 812 functions as a tank-side tip electrode, and is electrically connected to the tank-side electrode 803 and the tank bottom surface as a conduction path. The suction port 44 for sucking up fuel from the tank is provided above the needle portion 812 so that the water in the internal water receiving portion of the water receiving tray 801 is not directly sucked. Moreover, even if water remains in the packing 804 and the metal part of the fuel tank 6 by covering the portions except the inner side and the outer side of the bottom portion of the water tray 801 with a non-conductive paint or the like, a malfunction occurs. It is not a factor.

  Further, by covering the inner surface of the fuel tank 6 with a non-conductive paint up to the upper side of the suction port 44 that sucks up fuel from the tank, harmful effects caused by water in a system other than the water detection system using electricity can be prevented. be able to.

A tank die as a guard means for guarding the water receiving tray 801 is welded around the conductive water receiving tray 801 provided on the bottom surface of the fuel tank 6. The shape of this tank die is such that a rib or U- shaped shape that is higher than the surface to be welded to the fuel tank 6 and higher than the height of the water tray 801 is provided around the tank die. For this reason, when the fuel tank 6 is taken out from the main body and is refueled with the fuel filler port upward, even if there is a foreign object on the bottom surface of the fuel tank 6 or the surface that contacts the water tray 801 side, 801 can be protected from scratches and dents, and water detection malfunctions can be prevented.

  Further, the fuel amount detection means 750 is opposed to the float 752 in which a magnet 751 which is disposed inside the tank and functions as a detected portion is built, and the float 752 so as to be turned ON / OFF in accordance with the approach / separation operation of the magnet 751. And a reed switch 753 installed on the tank mounting table 1d side.

  The float 752 is mounted in a permeable cylindrical guide 754 with a canopy so that it can move up and down in accordance with fuel level fluctuations, with the magnet disposed below, and the lower end surface of the guide 754 is water-detecting. The means 800 is integrally fixed to the inner surface of the water tray 801. The reed switch 753 is fixed to the lower surface of the central convex portion of the tank mounting table 1d so as to face the float 752. The guide 754 is for protecting a commercially available fuel hose from coming into contact with the float 752 when the fuel in the fuel tank 6 is drained. When this guide 754 is made of metal, no burr is generated on the inside. Is given.

  Accordingly, when the fuel in the fuel tank 6 decreases and reaches a certain liquid level, the reed switch 753 is sensed by the magnet of the float 752, and the operation is sent to the control unit 950, and the display unit 952 runs out of fuel. Etc. can be notified.

  The tank mounting detection means 900 includes a micro switch 901 in which a switch body 901a is installed on the lower surface of the tank mounting table 1d, and a movable contact 901b is set so as to be able to protrude and retract from a hole 758 formed in the outer peripheral mounting surface 757. When the tank 6 is placed on the placement surface 757, the movable contact 901b is pushed back by the tank and turned ON.

  FIG. 8 is a configuration diagram of a control circuit that controls various operation modes based on signals from the fuel amount detection means 750, the water detection means 800, and the tank mounting detection means 900. As shown in the figure, the control unit 950 is composed of a microcomputer incorporating a CPU, a ROM and a RAM. The fuel amount detection means 750, the water detection means 800, and the tank mounting detection means 900 are connected to the input side, and the output side is connected. An electromagnetic pump drive circuit 951, a display unit 952, and a valve drive circuit 953 are connected to perform operation control by various input signals.

  For example, when the fuel tank is pulled out during operation and the tank mounting detection means 900 is OFF (no tank), the signal is input to output a stop signal for the electromagnetic pump to the pump drive circuit 951 and the valve drive circuit. Control for stopping operation by outputting an open signal of the air valve 20 to 953 and control for driving an empty-burn cleaning operation mode for empty-burning the vaporizer 12 when the tank mounting detection means 900 is also ON can be performed.

  The air-burning cleaning refers to air-burning impurities deposited in the vaporizer by sending air instead of fuel to the vaporizer 12 by opening the air valve 20 (see FIG. 2) while the operation is stopped. In this air baking cleaning, when an air baking cleaning switch (not shown) is turned ON, the temperature of the vaporizer 12 is automatically raised to the air baking cleaning temperature, the air valve 20 is opened, and the electromagnetic pump 13 is driven. This is done by sending air to the vaporizer.

  By controlling in this way, the atmospheric pressure of the air entering from the air valve 20 is larger than the pressure in the fuel tank 6, so air is sucked from the air valve 20 and sent to the carburetor 12, where the carburetor 12 The impurities are removed by raising the temperature of the vaporizer 12 and baking with air for a predetermined time. In such an empty-burn cleaning, there is no means for removing the fuel from the oil feeding path, and the trouble of removing the fuel from the oil feeding path is eliminated.

  Further, in the control unit 950, when the tank mounting detection means 900 is in the ON state and the fuel amount detection means for detecting the fuel amount is in the OFF state (with fuel), based on an operation command from an operation switch (not shown). Thus, the electromagnetic pump 13 can be driven to start the operation. Further, during the combustion operation, when the tank mounting means 900 is in the ON state (tank mounted state) and the fuel amount detection means for detecting the fuel amount is in the ON state (no fuel), it can be controlled to stop the operation. In addition, when the ON state (out of fuel) of the fuel amount detection means 750 is detected, the display unit 952 can be informed of refueling.

  In addition, it is not limited to the said embodiment of this invention, Many corrections and changes can be added within the scope of the present invention. For example, in the above embodiment, the oil supply joint and the return oil joint are respectively illustrated as extending from the upper surface of the oil tank to the side, but not limited to this, if the upper portion of the oil tank, not only the upper surface, You may employ | adopt the structure protruded from a side surface.

Front partial sectional view of an oil fan heater according to an embodiment of the present invention Configuration diagram of liquid fuel combustion device Schematic diagram of the oil tank Similarly perspective view of the connection part of the oil tank Sectional drawing which shows the relationship between a fuel tank and a mounting base Similarly, bottom section of the oil tank Similarly, a perspective view of the water tray mounting hole of the oil tank viewed from inside the tank Similarly, control circuit diagram of liquid fuel combustion system Partially omitted front sectional view showing an example of a conventional oil fan heater

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Petroleum fan heater body 2 Front plate 3 Top plate 4 Operation part 5 Outlet 6 Oil supply tank 7 Lid 8 Stand 9 Oil supply joint 10 Oil supply joint receptacle 11 Tank guide 12 Vaporizer 13 Electromagnetic pump 14 Burner 15 Combustion chamber 16 Partition plate 17 Burner box 18 Storage container 19 Cooling fin 20 Air valve 21 Return oil joint 22 Return oil joint receiver 23 Handle 600 Closure means 750 Fuel amount detection means 800 Water detection means 801 Water catcher 900 Tank mounting detection means 950 Controller

Claims (8)

A fuel tank that is removably accommodated in a tank storage chamber in the main body of the apparatus and a combustion section that combusts the fuel sent from the fuel tank, a fuel tank that temporarily stores fuel is eliminated, and the fuel tank A liquid fuel combustion apparatus configured to send fuel directly to a combustion section,
An oil supply port for supplying fuel is provided on the upper surface side of the oil supply tank, and water detection means for detecting water in the tank is provided on the bottom surface side of the oil supply tank,
The water detection means includes a conductive water tray provided on the bottom surface of the conductive tank for collecting condensed water, an electrode that contacts the water tray, an electrode that contacts the oil tank, a water tray and a fuel supply. A liquid fuel combustion apparatus comprising: an insulator that electrically insulates a tank; and detecting the presence or absence of water in the tank based on a difference in electrical resistance between water stored in a water tray and fuel.   2. The liquid fuel combustion apparatus according to claim 1, wherein the water tray is formed separately from a tank and is attached to a bottom surface mounting hole of the fuel tank via an electrical insulator.   The liquid fuel combustion apparatus according to claim 1, wherein the water tray is formed of a stainless steel plate. 4. The liquid fuel combustion apparatus according to claim 3, wherein a non-conductive paint is applied to a portion excluding an inner side and an outer side portion of a bottom surface portion of the water tray formed of the stainless steel plate.   The said electrical insulator was comprised from the non-conductive packing interposed between the surrounding wall of the hole formed in the bottom face of a fuel tank, and the circumference | surroundings of a water receiving tray. Liquid fuel combustion device.   The liquid fuel combustion apparatus according to claim 5, wherein the packing is subjected to a water repellent treatment.   2. The liquid fuel combustion according to claim 1, wherein a needle portion having a narrow width and an acute tip is formed in a part of a hole on the tank side to which the water tray is attached to form a tank side tip electrode. apparatus.   The liquid fuel combustion apparatus according to any one of claims 1 to 7, wherein guard means for guarding the water tray is attached to a tank side to which the water tray is mounted.

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