JP3856570B2 - Liquid fuel combustion equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid fuel combustion apparatus such as an oil fan heater that supplies liquid fuel such as kerosene from a cartridge-type fuel tank to a combustor and collects unburned fuel in the fuel tank again.
[0002]
[Prior art]
A conventional oil fan heater is shown in FIGS. 1 is a cartridge type fuel tank, 2 is an oil tray, and as is well known, the kerosene K is discharged from the fuel tank 1 by inserting the fuel tank 1 with the kerosene supply cap 3 also serving as a kerosene replenishment port down. To the fixed oil level A. 4 is an oil feed electromagnetic pump that sends kerosene K in the oil tray 2 to the vaporizer element 7 in the vaporizer 6 through the oil feed pipe 5, and 8 is a vaporizer 7 that evaporates and vaporizes the kerosene K while keeping the vaporizer 6 at a high temperature. A vaporizing heater 9 is a nozzle for supplying vaporized gas evaporated by heating of the vaporizing heater 8 to the burner 10, and 11 is an ignition heater for igniting and burning the vaporized gas injected and supplied to the burner 10. Reference numeral 12 denotes a carburetor solenoid valve that controls the opening and closing of the nozzle 9 with a needle 13, 14 a frame sensor that detects the combustion state, and 15 a temperature of combustion exhaust gas generated in the burner 10 from the louver 18 in front of the cabinet 17 through the combustion chamber 16 into the room. It is a blower fan that sends it into the room as wind.
[0003]
Next, the operation of this oil fan heater will be described. As shown in FIG. 15, kerosene K is supplied to the constant oil level A of the oil tray 2 by mounting the fuel tank 1 in the cabinet 17. When the operation switch is turned on, the kerosene K in the oil tray 2 is fed into the vaporizer 6 through the oil feeding pipe 5 by the oil feeding electromagnetic pump 4 in accordance with a signal from a control unit (not shown) composed of a microcomputer. Kerosene K evaporates in the vaporizing element 7 heated to high temperature by the vaporizing heater 8 and is ejected from the nozzle 9 opened by the operation of the vaporizer solenoid valve 12 to the burner 10 as shown in FIG. The At that time, the vaporized gas is mixed with the air flowing in at the throat portion of the burner 10, ignited by the ignition heater 11 at the flame opening portion of the burner 10, starts combustion in the combustion chamber 16, and the flame sensor 14 changes the combustion state. Continue combustion while detecting. The combustion exhaust gas generated at this time is discharged as warm air through the louver 18 outside the cabinet 17 by the blower fan 15.
[0004]
At the time of fire extinguishing, as shown in FIG. 16, first, the oil feeding electromagnetic pump 4 is stopped, then the vaporizer electromagnetic valve 12 is operated, and the nozzle 9 is closed by the needle 13 to complete the combustion. At the same time, as shown in FIG. 17 (b), when the nozzle 9 is closed by the needle 13, the recovery port 19 of the vaporizer 6 is opened, communicates with the return pipe 20, and remains in the vaporizer 6. The kerosene K and vaporized gas passing through the recovery port 19 are returned from the return pipe 20 to the oil pan 2 and the operation is stopped.
[0005]
[Problems to be solved by the invention]
In the oil fan heater having the above structure, when fuel or a highly volatile fuel such as gasoline is accidentally supplied to the fuel tank and the oil pan, the temperature of the fuel tank rises during combustion, and the internal pressure of the fuel tank rises. The fuel is pushed out, the oil level of the oil pan rises abnormally, and may overflow from the oil pan. As a result, a highly volatile fuel approaches the combustion section (ignition source) and may ignite, which is easily imagined as extremely dangerous.
[0006]
In addition, since the kerosene supply cap is usually inserted into the oil pan when the fuel tank is mounted, kerosene is always attached to this. For this reason, there is a problem that kerosene is dripped when the fuel tank is removed or that a hand is soiled when the kerosene supply cap is opened or closed to replenish the fuel.
[0007]
On the other hand, for example, Japanese Patent Laid-Open Nos. 8-313059 and 8-313060 disclose a structure in which a fuel tank, an oil feed electromagnetic pump, and a vaporizer are integrated and separated from a burner. ing. According to this structure, kerosene can be supplied to the burner without touching the outside air, and no dripping of kerosene occurs. However, since a member such as a carburetor is attached to the fuel tank, it is necessary to be careful in handling, and the weight is increased, and there is a problem in use as a cartridge type fuel tank.
[0008]
Next, at the time of fire extinguishing, kerosene and vaporized gas remaining in the vaporizing element are recovered to the oil pan by the return pipe, but the vaporized gas remaining in the vaporizing element is very high pressure. , Leaks from the nozzle slightly. Since this vaporized gas flows out of the cabinet without burning (not reacting), it remains as an odor at the time of fire extinguishing, and also remains and accumulates as tar during the cooling process, leading to a problem that the lifetime of the vaporizer is reduced.
[0009]
In response to this, for example, JP-A-1-136230 discloses a technique in which an electromagnetic pump is provided in a return pipe, forcibly sucking unburned fuel and collecting it in a fuel tank. This solves the problem of odor and tar during fire extinguishing, but in this fuel tank, the suction pipe and return pipe of the electromagnetic pump are directly inserted into the fuel tank, and these are removed when the fuel tank is removed. The problem of kerosene dripping from the pipe still exists.
[0010]
In view of the above, an object of the present invention is to provide a safe liquid fuel combustion apparatus that can supply liquid fuel such as kerosene from a fuel tank and efficiently recover unburned fuel without touching outside air.
[0011]
[Means for Solving the Problems]
  According to an aspect of the present invention, there is provided an apparatus main body including a detachable fuel tank, a combustor disposed on a side of the fuel tank, and a supply pump for supplying liquid fuel from the fuel tank to the combustor. The fuel tank has a fuel outlet communicating with the supply pump, and the fuel outlet is formed at an upper portion of the fuel tank and combusts through a fuel tank side pipe connected to the fuel outlet and the supply pump. It is detachably connected to the device body side pipe leading to the container,The fuel tank side pipe penetrates the fuel outlet from the inside of the fuel tank and is formed to face downward on the side of the fuel tank, and the apparatus main body side pipe rises from the combustor along the fuel tank. The fuel tank side connection port in the connection part of the both pipes is disposed above the apparatus main body side connection port.
[0012]
In addition to the above configuration, A fuel return port for recovering unburned fuel in the combustor is formed in the upper part of the fuel tank, and the apparatus main body side return pipe connected to the combustor and the fuel tank side return connected to the fuel return port The fuel tank side return pipe is formed so as to pass through the fuel return port from the inside of the fuel tank and face downward on the side of the fuel tank. The fuel tank is formed so as to rise from the combustor along the fuel tank, and the fuel tank side connection port at the connection portion of the two pipes is disposed above the apparatus main body side connection port.
[0013]
As a result, when the fuel tank is mounted on the main body of the apparatus, the liquid fuel path from the fuel tank to the combustor or from the combustor to the fuel tank is not released to the atmosphere. This prevents the liquid fuel from adhering to the fuel tank. In addition, by arranging the connection above the liquid level in the fuel tank, even if the connection is incomplete, liquid fuel in the fuel tank side pipe will return to the fuel tank and prevent it from leaking outside. it can.
[0014]
In addition, the fuel tank side connection port in the connection portion is disposed above the main body side connection port, and an on / off valve is provided at the fuel tank side connection port to open and close the fuel tank side connection port. Are opened, and when the connection between the fuel tank side pipe and the main body side pipe is released, the fuel tank side pipe is closed. Therefore, regardless of the shape of the piping, the fuel tank side connection port will always be located above the main unit side connection port, and when the fuel tank is removed or accidentally disconnected, the fuel on the upper side Since the tank side connection port is closed, liquid fuel can be prevented from dripping from here.
[0015]
Furthermore, if the discharge port of the supply pump is disposed at a position lower than the attachment port of the main body side pipe of the combustor, the liquid fuel in the pipe is supplied to the combustor when the supply pump stops. This can prevent the amount of unburned fuel in the combustor. In addition, if a safety valve is provided in the piping between the fuel tank and the supply pump so that liquid fuel cannot pass when the supply pump is stopped, the supply pump stops and the supply pump is stopped at the same time. The inflow of the liquid fuel into the pipe is blocked, so that no liquid fuel remains in the pipe.
[0016]
Further, a passage communicating with the atmosphere is formed in the vicinity of the return pipe attachment port of the combustor, and an open valve is provided for opening the passage when the suction pump is operating. When recovering unburned fuel, air is sent into the combustor, and the unburned fuel can be sucked efficiently. Moreover, since this air is replaced with unburned fuel, it is possible to completely suppress the leakage of vaporized gas, which is a cause of bad odor during fire extinguishing.
[0017]
  By the way, when supplying liquid fuel, if the pressure inside the fuel tank becomes negative, the supply is hindered. Therefore, the fuel tank has an air inlet valve to prevent this.Provided.This air inlet valve is opened and closed by a locking means that locks the connection when the fuel tank is installed in the cabinet.can do.As a result, the fuel tank side pipe and the main body side pipe are connected, and at the same time, the air inflow valve can be opened, and no special operation is required.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
As an embodiment of the present invention, a liquid fuel vaporization type combustion apparatus such as an oil fan heater is shown in FIGS. 1 to 9. FIGS. 1 to 5 show a fuel tank attached to a cabinet, and FIGS. It is the state of time. In addition, the same code | symbol is attached | subjected and demonstrated to the structural member which has the same function as a prior art.
[0019]
The oil fan heater includes a cartridge-type fuel tank 30 that is detachably attached to the cabinet 17, and a combustion chamber 16 that burns kerosene directly supplied from the fuel tank 30 is formed on the side of the fuel tank 30. ing. A blower fan 15 is disposed behind the combustion chamber 16, and a louver 18 is formed on the front surface of the cabinet 17, from which hot air is blown out. And the combustor 31 is provided in the lower part of the combustion chamber 16, and the combustor 31 is comprised by the vaporizer | carburetor 6, the burner 10, etc., and is the same as the past. The combustor 31 and the fuel tank 30 are connected by a supply path for supplying kerosene and a recovery path for recovering unburned fuel such as unburned kerosene and vaporized gas.
[0020]
The fuel tank 30 is placed vertically in the cabinet 17, and a handle 33 is attached to the upper surface via a holding bracket 32 so as to be raised and lowered. An opening 34 for inserting and removing the fuel tank 30 is formed on the upper surface of the cabinet 17, and a lid 35 that can be opened and closed is provided in the opening 34. As a result, the fuel tank 30 is detachable from above the cabinet 17. In addition, the opening 34 may be formed in the side surface or the rear surface of the cabinet 17, and the fuel tank 30 may be attached or detached from the side. In this case, the handle 33 is attached to the side surface of the fuel tank 30.
[0021]
By the way, a liquid level display using a prism effect or the like is provided on the side surface of the fuel tank 30 so that the fuel tank 30 does not overflow when it is refilled with kerosene. Knowing that the tank is full, stop refueling. Alternatively, when replenishing with an electric pump, the liquid level is automatically detected and refueling is stopped when a predetermined level is reached. As described above, when the fuel tank 30 is refueled, it is normal that the fuel tank 30 is not refilled until the internal volume is full, but a slight margin is usually provided, and the specified capacity of the fuel tank 30 is also displayed in consideration of this margin. The Therefore, the liquid level when the kerosene is supplied to the fuel tank 30 to the specified capacity becomes the uppermost liquid level L.
[0022]
A replenishing port 36 for replenishing kerosene is formed on the upper surface of the fuel tank 30, and a refueling cap 37 is detachably fitted to the replenishing port 36. The oil supply cap 37 has a cap packing 38, and the supply port 36 can be sealed by fitting the oil supply cap 37. A fuel outlet 39 for supplying kerosene to the carburetor 6 and a fuel return port 40 for collecting unburned fuel in the carburetor 6 are formed on the upper surface of the fuel tank 30. Therefore, the replenishment port 36, the fuel outlet 39, and the fuel return port 40 are located above the uppermost liquid level L.
[0023]
An inflow pipe 41 is inserted into the fuel outlet 39 via a bush 42, and the fuel outlet 39 is sealed. A discharge pipe 43 is also inserted into the fuel return port 40 via the bush 42, and the fuel return port 40 is sealed.
[0024]
The supply path is vaporized through an inflow pipe 41 that is a fuel tank side pipe inserted into a fuel outlet 39 of the fuel tank 30 and an oil supply pipe 45 that is a main body side pipe connected to the pipe through a connection portion 44. To vessel 6. An oil feeding electromagnetic pump 46 as a supply pump is provided in the supply path.
[0025]
The inflow pipe 41 is formed so as to be bent from the upper side to the side of the fuel tank 30, and the inlet 47 at one end is near the bottom surface of the fuel tank 30 and is connected to the oil feeding pipe 45 at the other end. The connection port 48, that is, the fuel tank side connection port 48 is located higher than the uppermost liquid level L on the side of the fuel tank 30. An opening / closing valve 50 that opens and closes the connection port 48 is provided at the other end of the inflow pipe 41.
[0026]
The on-off valve 50 is a valve body 52 slidably accommodated in a body 51 connected to the inflow pipe 41, and is supported by a fixed base 53 attached to the upper part of the fuel tank 30. The valve body 52 is biased by the spring 54 so as to close the connection port 48. When the fuel tank 30 is not attached to the cabinet 17, the connection port 48 of the inflow pipe 41 is closed and dripping of kerosene is performed. It is preventing.
[0027]
The oil feeding pipe 45 falls along the fuel tank 30 along the side, and further extends in the horizontal direction toward the vaporizer 6, and is attached to the lower surface of the vaporizing element 7 of the vaporizer 6. . Further, as shown in FIG. 10, an open pipe 60 having one end opened is connected to the side surface of the vaporizing element 7 to form a passage communicating with the atmosphere. An open electromagnetic valve 61 as an open valve is provided in this passage, and opens and closes the passage. Note that the open pipe 60 may be formed directly on the oil feed pipe 45, and it is only necessary that the open electromagnetic valve 61 be upstream of the recovery port 19 of the vaporizer 6.
[0028]
An oil feed electromagnetic pump 46 is interposed in the middle of the oil feed pipe 45, and the oil feed electromagnetic pump 46 is disposed at a position lower than the vaporizer 6. Therefore, between the pump 46 and the vaporizer 6, the oil feeding pipe 45 is inclined so as to become lower toward the pump 46. That is, the discharge port 62 of the pump 46 is lower than the pipe attachment port 63 of the vaporizer 6.
[0029]
A safety electromagnetic valve 64 is provided at the end of the oil feeding pipe 45 on the inflow pipe 41 side, and the safety electromagnetic valve 64 is operated in conjunction with the oil feeding electromagnetic pump 46. That is, when the oil feeding electromagnetic pump 46 is operating, it is in an open state, and when it is stopped, it is in a closed state. By opening and closing in this way, the passage of kerosene to the oil feeding pipe 45 is restricted. The safety solenoid valve 64 is disposed on the side of the fuel tank 30 and is supported by a support frame 65 attached to the cabinet 17. Therefore, the inlet 66 of the safety solenoid valve 64 is a main body side connection port, and the portion connecting this to the connection port 48 of the inflow pipe 41 becomes the connection portion 44, and the connection portion 44 is the fuel tank 30 mounted on the cabinet 17. It is in a position higher than the uppermost liquid level L.
[0030]
A protrusion 67 for opening the on-off valve 50 when the inflow pipe 41 and the oil feeding pipe 45 are connected is formed at the inlet 66 of the safety electromagnetic valve 64. That is, the projecting body 67 can be inserted into the connection port 48 of the on-off valve 50 and pushes up the valve body 52 against the urging force of the spring 54 to open the on-off valve 50. Further, a packing 68 such as an O-ring is disposed around the inlet 66 so as to come into contact with the body 51 of the on-off valve 50, and is sealed so that kerosene does not leak at the connection portion 44.
[0031]
The recovery path reaches the fuel tank 30 from the vaporizer 6 through the return pipe 70 that is the main body side return pipe and the discharge pipe 43 that is the fuel tank side return pipe connected to the return pipe 70 via the connection portion 44. A suction electromagnetic pump 71 as a suction pump is provided in the collection path.
[0032]
The discharge pipe 43 is formed so as to be bent from the upper side to the side of the fuel tank 30, and the discharge port 72 at one end thereof is positioned higher than the uppermost liquid level L in the fuel tank 30. The connection port 73 to the end return pipe 70, that is, the fuel tank side connection port 73 is located higher than the uppermost liquid level L on the side of the fuel tank 30. The connection port 73 is provided with an on-off valve 50 as in the case of the inflow pipe 41, and when the fuel tank 30 is not attached to the cabinet 17, the connection port 73 of the discharge pipe 43 is closed.
[0033]
The return pipe 70 falls in parallel with the oil feed pipe 45 at the side of the fuel tank 30 and is formed so as to extend in the horizontal direction toward the carburetor 6. The return pipe 70 is attached to the lower surface of the carburetor 6, and the recovery port 19. Communicating with A suction electromagnetic pump 71 is provided at the end of the return pipe 70 on the discharge pipe 43 side. The suction electromagnetic pump 71 is supported by the support frame 65 along with the safety electromagnetic valve 64, and the outlet 74 thereof has the same structure as the inlet 66 of the safety electromagnetic valve 64. Therefore, a portion connecting the outlet 74 of the suction electromagnetic pump 71 and the connection port 73 of the discharge pipe 43 is a connection portion 44, which is at a position higher than the uppermost liquid level L of the fuel tank 30 mounted on the cabinet 17. .
[0034]
Here, when the fuel tank 30 is attached to the cabinet 17, the inflow pipe 41 and the oil supply pipe 45, and the discharge pipe 43 and the return pipe 70 are connected at the connection portion 44. Locking means is provided so that it can be stopped. This is to operate the lever 80 attached to the cabinet 17 to fix and hold the fuel tank 30. That is, a pair of fixed angles 81 are formed on the upper portion of the support frame 65, and the lever 80 is rotatably supported by the support shaft 82 that is interposed between the fixed angles 81. An opening 83 is formed at the center of the lever 80, and a locking piece 84 is fitted into the opening 83. The locking piece 84 is rotatably supported by a central shaft 85 provided on the lever 80 and is swung in the opening 83. A fixed pin 86 is inserted between the fixed bases 53 of the fuel tank 30, and a notch 87 is formed on the back surface of the lever 80 so as to engage with the pin 86. Further, a claw 88 is formed at the tip of the locking piece 84, a locking pin 89 is passed to the fixed angle 81, and the claw 88 is engaged with the locking pin 89 by the movement of the locking piece 84.
[0035]
In this way, when the locking piece 84 is engaged with the locking pin 89, the rotation of the lever 80 is restricted, and the lever 80 presses the fuel tank 30 from above via the fixing pin 86, and the fuel The tank 30 is fixedly held at a predetermined position with respect to the cabinet 17, and the connecting portion 44 is correctly positioned and locked.
[0036]
An air inflow valve 90 is provided on the upper surface of the fuel tank 30 to prevent the inside of the fuel tank 30 from becoming negative pressure when kerosene is supplied, and this lever 80 is used to operate. Yes. That is, in the air inflow valve 90, the valve body 92 that opens and closes the air hole 91 formed on the upper surface of the fuel tank 30 is biased upward by the spring 93, and the valve rod 94 to which the valve body 92 is attached is attached to the fuel tank 30. Projecting upward. When the fuel tank 30 is fixed by operating the lever 80, the lever 80 comes into contact with the upper end of the valve rod 94, whereby the valve body 92 is pushed down and the air hole 91 can be opened.
[0037]
Next, the operation of this oil fan heater will be described. Here, the operation mainly related to the flow of fuel will be described, but the operation of ignition and combustion is the same as the conventional one, and the description thereof will be omitted. Each valve, pump, combustor, and the like are controlled by a control unit including a microcomputer. When the operation is stopped except for fire extinguishing immediately after the operation is stopped, an oil feeding electromagnetic pump 46 and a suction electromagnetic pump are used as shown in FIG. 71 is stopped and the safety solenoid valve 64 and the open solenoid valve 61 are closed. The fire extinguishing will be described later.
[0038]
First, during operation, when the operation switch is turned on, the oil feeding electromagnetic pump 46 is operated by the signal from the control unit as shown in FIG. 12, and the safety electromagnetic valve 64 is opened. The suction electromagnetic pump 71 remains stopped, and the open electromagnetic valve 61 remains closed. Then, the kerosene sucked into the inflow pipe 41 from the fuel tank 30 is supplied to the carburetor 6 from the on-off valve 50 and the safety electromagnetic valve 64 through the oil feed pipe 45. Then, it is evaporated and vaporized in the vaporizing element 7 and ejected from the nozzle 9 to the burner 10 as vaporized gas.
[0039]
At this time, the kerosene in the fuel tank 30 is discharged and the inside of the fuel tank 30 becomes negative pressure. However, since the air inflow valve 90 is opened by the lever 80, the inside of the fuel tank 30 is opened to the atmosphere. . As a result, the negative pressure in the fuel tank 30 is eliminated, the capacity of the oil feeding electromagnetic pump 46 is not reduced, and kerosene can be supplied stably by a simple mechanism.
[0040]
Next, at the time of fire extinguishing immediately after the operation is stopped, the operation switch is turned off, and the suction electromagnetic pump 71 is operated by the signal from the control unit as shown in FIG. The oil feeding electromagnetic pump 46 is stopped and the safety electromagnetic valve 64 is closed. Then, the needle 13 closes the nozzle 9 by the operation of the vaporizer solenoid valve 12, the supply of the vaporized gas to the burner 10 is stopped, and the fire is extinguished.
[0041]
At this time, the open electromagnetic valve 61 is energized for a certain period of time to be in an open state, the inside of the vaporizer 6 is opened to the atmosphere, and a large amount of air enters and fills the vaporizing element 7 as the suction electromagnetic pump 71 is operated. . Note that this fixed time is sufficient to return all unburned fuel in the carburetor 6 to the fuel tank 30. Unburned fuel such as kerosene remaining in the vaporizer 6, vaporized gas, or kerosene remaining in the oil feed pipe 45 passes through the return pipe 70 and is collected in the fuel tank 30 through the discharge pipe 43. All unburned fuel inside is replaced with air. As a result, the vaporized gas that is the source of the odor is not present in the vaporizer 6, and the generation of bad odor during fire extinguishing can be prevented. In addition, since no kerosene that causes tar is present, tar does not occur, and accumulation of tar in the vaporizer 6 does not occur. Therefore, the lifetime of the vaporizer 6 can be extended.
[0042]
Further, since the oil feeding pipe 45 is inclined downward from the vaporizer 6 toward the oil feeding electromagnetic pump 46, the kerosene remaining in the oil feeding pipe 45 does not flow into the vaporizer 6 and further into the atmosphere. There is no leakage from the open passage.
[0043]
Simultaneously with this fire extinguishing operation, the safety solenoid valve 64 is closed, and kerosene does not flow into the oil feeding pipe 45 from the fuel tank 30. This is because the liquid level of kerosene in the fuel tank 30 is higher than the nozzle 9 of the vaporizer 6 because of the siphon effect when the open solenoid valve 61 is opened and the vaporizer 6 is opened to the atmosphere. There is a possibility that kerosene will flow out of the fuel tank 30, but by closing the oil feeding pipe 45 with the safety solenoid valve 64, the kerosene flow is stopped. In addition, even if there is a place opened to the atmosphere from the oil feeding pipe 45 to the nozzle 9 of the vaporizer 6 due to inadequacy in processing or assembling, kerosene may leak due to the siphon effect in the same manner. Leakage can also be prevented.
[0044]
By the way, when the kerosene in the fuel tank 30 decreases, it must be replenished. At this time, first, the locking piece 84 is moved counterclockwise, the claw 88 is separated from the locking pin 89, and the lever 80 is lifted. Then, there is no restriction on the fuel tank 30 and the fuel tank 30 can be removed from the cabinet 17. When the fuel tank 30 is removed, the connecting portion 44 is smoothly separated, the connection ports 48 and 73 of the inflow pipe 41 and the discharge pipe 43 are closed by the on-off valve 50, and dripping of kerosene remaining in the pipes 41 and 43 is dropped. Is prevented. Further, the air inflow valve 90 is also closed, and the fuel tank 30 is sealed, so that kerosene does not leak even if the fuel tank 30 falls. In addition, kerosene is not attached to the outer surface of the fuel tank 30, and hands and clothes are not soiled.
[0045]
When kerosene is replenished from the replenishing port 36 of the fuel tank 30 and attached to the cabinet 17 again, the connection port 48 of the inflow pipe 41 is connected to the inlet 66 of the safety solenoid valve 64, and the connection port 73 of the discharge pipe 43 is connected. It is connected to the outlet 74 of the suction electromagnetic pump 71. Then, the on-off valve 50 is opened. Thereafter, the lever 80 is tilted until it comes into contact with the fixing pin 86, the locking piece 84 is moved clockwise, and the claw 88 is engaged with the locking pin 89. As a result, the fuel tank 30 is fixedly held in the cabinet 17 and the connecting portion 44 is securely locked and brought into close contact, so that kerosene does not leak from the connecting portion 44.
[0046]
Further, since the connecting portion 44, the fuel outlet 39, and the fuel return port 40 are located at a position higher than the uppermost liquid level L of the fuel tank 30, even if the connection is disconnected or a gap is formed due to some factor during combustion or stoppage, The kerosene in the fuel tank 30 does not flow out. That is, when these positions are lower than the uppermost liquid level L, kerosene with a difference from the liquid level in the fuel tank 30 to the connection position flows out of the fuel tank 30 due to the siphon effect, but is at a higher position. On the contrary, kerosene flows toward the fuel tank 30 and can prevent such leakage of kerosene, thereby improving safety. In addition, since kerosene is supplied and recovered through a closed space, liquids with high volatility, such as gasoline, can be prevented from leaking to the outside even if they are accidentally used and evaporate. Increased safety.
[0047]
In addition, this invention is not limited to the said embodiment, Of course, many corrections and changes can be added to the said embodiment within the scope of the present invention. For example, the fuel outlet 39, the fuel return port 40, and the replenishing port 36 of the fuel tank 30 are formed at positions higher than the uppermost liquid level L. However, if at least the connecting portion 44 is at a position higher than the uppermost liquid level L. Since the leakage of kerosene due to the siphon effect can be prevented, the fuel outlet 39, the fuel return port 40, and the replenishing port 36 do not have to be at a position higher than the uppermost liquid level L and should be as high as possible in the fuel tank 30. .
[0048]
【The invention's effect】
As is apparent from the above description, according to the present invention, the combustor is disposed on the side of the detachable fuel tank, the fuel outlet communicating with the supply pump is formed in the upper part of the fuel tank, and connected to the fuel outlet. The fuel tank side pipe and the main body side pipe leading to the combustor through the supply pump are detachably connected, and the fuel tank side pipe penetrates the fuel outlet from the inside of the fuel tank, and on the side of the fuel tank. Formed to face down,The main body side pipe is formed so as to rise from the combustor along the fuel tank, and the fuel tank side connection port at the connection portion of the both pipes is disposed above the apparatus main body side connection port.Since it is structured, liquid fuel can be supplied from the fuel tank without touching the outside air, there is no leakage due to evaporation of liquid fuel in the middle, and safety can be ensured even if it is placed near the combustor. . Moreover, even when the fuel tank is removed, liquid fuel is not attached to the outer surface thereof, so that liquid fuel can be replenished without contaminating the hands and surroundings, and handling becomes easy.
[0049]
Further, a fuel return port communicating with a suction pump for recovering unburned fuel in the combustor is formed in the upper part of the fuel tank, and a main body side return pipe connected to the combustor and a fuel tank connected to the fuel return port The side return pipe is detachably connected, and the connection part of both pipes is located above the liquid level in the fuel tank, so that you can touch the outside air when collecting unburned fuel in the fuel tank. And can be recovered quickly. As a result, residual vaporized gas will not leak, no odor will be generated during fire extinguishing, discomfort can be eliminated, and tar generation due to residual unburnt fuel can be suppressed. Life can be extended.
[0050]
Here, by providing an open valve in the vicinity of the return pipe attachment port of the combustor so as to communicate with the atmosphere when the suction pump is operating, the combustor is quickly filled with air. Unburnt fuel can be discharged, and the recovery time can be shortened to achieve efficient recovery.
[0051]
Also, if the discharge port of the supply pump is located at a position lower than the piping attachment port of the combustor, after the supply pump is stopped, the liquid fuel remaining in the piping is prevented from flowing into the combustor and thereby recovered. It is possible to prevent the unburned fuel to be increased from increasing and the recovery from being prolonged.
[0052]
Furthermore, in the fuel tank having the above structure, it is preferable to provide a safety valve for closing the piping between the supply pump and the fuel tank so that liquid fuel cannot pass when the supply pump is stopped. That is, although the supply pump is stopped, liquid fuel may flow out of the fuel tank due to the siphon effect, and the recovery of unburned fuel is hindered. However, since the outflow of the liquid fuel from the fuel tank can be blocked by the safety valve, the recovery can be performed efficiently.
[0053]
And, if the connection part of the pipe is arranged at a position higher than the liquid level in the fuel tank, the liquid fuel in the fuel tank side pipe will stay in the fuel tank even if the connection is incomplete or loosened. It is possible to prevent the liquid fuel from flowing out and improve safety. In particular, the fuel outlet and the fuel return port are formed so that the fuel tank is sealed at a position higher than the uppermost liquid level when liquid fuel is contained up to the specified capacity of the fuel tank, and the connection part is also at the uppermost liquid level. The above-described effects can be obtained with certainty by disposing at a higher position.
[0054]
In addition, the fuel tank side connection port in the connection part is disposed above the main body side connection port, and if an on-off valve is provided on the fuel tank side connection port to open and close it, both connection ports will be separated when the fuel tank is removed. The fuel tank side connection port is automatically closed, and liquid fuel can be prevented from dripping from here. Moreover, even if the removed fuel tank falls, the connection port remains blocked, so that liquid fuel can be prevented from leaking from the fuel tank.
[0055]
Furthermore, by providing an air inflow valve in the fuel tank, the inside of the fuel tank can be opened to the atmosphere during fuel supply, and a reduction in the capacity of the supply pump can be prevented. Since this air inflow valve is opened and closed with the movement of the locking means for locking the connecting portion when the fuel tank is mounted on the apparatus main body, it is automatically opened just by mounting the fuel tank. The mechanism of the inflow valve can be simplified.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of an oil fan heater according to an embodiment of the present invention.
FIG. 2 is a side sectional view of an oil fan heater.
Fig. 3 Detailed view of the upper part of the fuel tank
FIG. 4 is a front view of a connecting portion.
Fig. 5 Configuration diagram of combustor
FIG. 6 is an overall configuration diagram of an oil fan heater when the fuel tank is detached.
FIG. 7 is a side sectional view of the same oil fan heater.
[Fig. 8] Detail view of the upper part of the fuel tank
FIG. 9 is a front view of the connection part.
10A is a cross-sectional view of the vaporizer during operation, and FIG. 10B is a cross-sectional view of the vaporizer during fire extinguishing.
FIG. 11 is a diagram showing a kerosene supply and recovery route when stopped
FIG. 12 is a diagram showing a kerosene supply and recovery route during operation.
FIG. 13 is a diagram showing kerosene supply and recovery routes during fire extinguishing.
FIG. 14 is an overall configuration diagram of a conventional oil fan heater.
FIG. 15 is a diagram showing an oil fan heater during operation.
FIG. 16 shows an oil fan heater during fire extinguishing
17A is a cross-sectional view of a vaporizer during operation, and FIG. 17B is a cross-sectional view of the vaporizer during fire extinguishing.
[Explanation of symbols]
6 Vaporizer
17 Cabinet
30 Fuel tank
31 Combustor
36 Supply port
39 Fuel outlet
40 Fuel return port
41 Inflow pipe
43 Discharge pipe
44 connections
45 Oil supply pipe
46 Oil feed electromagnetic pump
50 On-off valve
61 Open solenoid valve
64 Safety solenoid valve
70 Return pipe
71 Suction electromagnetic pump
80 lever
84 Locking piece
90 Air inlet valve
L Top liquid level

Claims (8)

The apparatus main body is provided with a detachable fuel tank, a combustor disposed on the side of the fuel tank, and a supply pump for supplying liquid fuel from the fuel tank to the combustor. A fuel outlet communicating with a supply pump, the fuel outlet being formed at an upper portion of the fuel tank, a fuel tank side pipe connected to the fuel outlet, and an apparatus main body side pipe connecting to the combustor via the supply pump; The fuel tank side pipe penetrates the fuel outlet from the inside of the fuel tank and is formed to face downward on the side of the fuel tank. The apparatus main body side pipe is connected to the combustor from the combustor. is formed so as to rise along the fuel tank, the possible liquid fuel combustion instrumentation, characterized in that the fuel tank side connection port of the connection portions of the pipe is arranged above the apparatus main body side connection port . A fuel return port for recovering unburned fuel in the combustor is formed in the upper part of the fuel tank, and the apparatus main body side return pipe connected to the combustor and the fuel tank side return connected to the fuel return port The fuel tank side return pipe is formed so as to pass through the fuel return port from the inside of the fuel tank and face downward on the side of the fuel tank. It is formed so as to rise along the fuel tank from the combustor, in claim 1 in which the fuel tank side connection port of the connection portion of the two pipes is characterized in that it is arranged above the apparatus main body side connection port The liquid fuel combustion apparatus as described . The liquid fuel combustion apparatus according to claim 2, wherein a suction pump that sucks unburned fuel in the combustor is provided in a return pipe on the apparatus main body side. Near the pipe mounting opening back of the combustor, is formed a passage communicating with the atmosphere, the open valve to the passage to the open state is provided when the suction pump is operating in claim 3, wherein The liquid fuel combustion apparatus as described. The on-off valve is provided for opening and closing the fuel tank side connection port, the opening and closing valve, is an open state when the fuel tank side pipe and the apparatus body side pipe is connected, a fuel tank side pipe and the apparatus body 3. The liquid fuel combustion apparatus according to claim 1 , wherein the liquid fuel combustion apparatus is closed when the connection with the side pipe is released. Discharge port of the supply pump and the combustor is communicated through a pipe, the discharge port is a liquid fuel combustion as claimed in claim 1 or 2, characterized in that arranged at a position lower than the piping installation port of the combustor apparatus. Fuel tank, liquid fuel combustion apparatus according to claim 1 or 2, characterized in that the air inlet valve to prevent the interior becomes negative pressure at the fuel supply is provided. 2. A safety valve for closing the pipe so that liquid fuel cannot pass when the supply pump is stopped is provided in the pipe between the fuel tank and the supply pump. liquid fuel combustion apparatus according to 2.

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