JP3681973B2 - Oil level detection mechanism for liquid fuel combustion equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an oil amount detection mechanism that detects and electrically outputs a fuel amount in a fuel tank in a heating device such as an oil fan heater.
[0002]
[Prior art]
Conventionally, oil fan heaters have been widely used in ordinary homes as winter heating equipment. FIG. 23 is a schematic partially omitted front cross-sectional view of an example of a conventional oil fan heater. FIG. 24 is a side sectional view thereof. FIG. 25 shows an oil level detection device in the fuel tank.
[0003]
As shown in FIG. 23, an oil supply tank 102 for injecting and storing liquid fuel 104 such as kerosene in advance is provided on the inside of the oil fan heater main body 101, and below the oil supply tank 102. A sufficient amount of liquid fuel 104 is supplied to the fuel tank 103 connected to the.
[0004]
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 thereof.
[0005]
The fuel gas vaporized by the carburetor 107 is jetted vigorously from a 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, as indicated by the arrows in FIG. 24, the air in the room sucked through the filter 112 is blown by the blower fan 111 attached to the fan motor 110 made of a single-phase induction motor or the like provided on the back surface of the main body 101. The heated air and combustion gas in 109 are blown into the room from the outlet 113 as warm air.
[0006]
On the other hand, the frame sensor 114 provided slightly above the flame outlet 108a detects a flame current caused by the combustion flame. When a flame current exceeding a preset value is detected, the fan motor 110 is energized, and the air is blown accordingly. The fan 111 rotates and the air sucked from the room is blown into the room from the air outlet 113 as warm air.
[0007]
At this time, the room temperature thermistor 115 detects the room temperature, and a control device (not shown) controls the driving of the fuel pumping electromagnetic pump 105 based on the temperature difference between the room temperature and the set temperature. The heating power of the combustion flame in the burner 108 is adjusted by adjusting the supply amount to the vaporizer 107.
[0008]
Therefore, for example, if the operation of the oil fan heater is started when the room temperature is low, the supply amount of the liquid fuel 104 is increased to the vaporizer 107 to rapidly increase the room temperature to the set temperature, and thereafter the supply amount of the liquid fuel 104 To maintain a constant value near the set temperature.
[0009]
In addition, the fuel in the fuel tank 102 is refilled by the user in accordance with a notification signal from the oil amount detection mechanism 120 that outputs an electrical signal when the oil level in the fuel tank becomes a predetermined height or less. Is taken out from.
[0010]
As shown in FIG. 25, the oil amount detection mechanism 120 includes a float 121 with a magnet that moves up and down according to the amount of fuel in the fuel tank 104, a support rod 122 that supports the float 121 so as to freely move up and down, The reed switch 123 is built in a predetermined position of the support rod 122. When the float 121 reaches a predetermined position, the reed switch is moved by the magnet to detect the height position of the oil level. . In the oil amount detection mechanism 120, a support rod 122 with a float is inserted inward from the upper surface of the fuel tank 104, and is fixed to the fuel tank 104 by a screw through a packing.
[0011]
[Problems to be solved by the invention]
By the way, in the conventional oil fan heater, a fuel tank fixed to the main body is provided below the fuel tank, and the oil amount detection mechanism 120 is provided in the fuel tank. Since the fuel tank is immersed in the fuel tank, the fuel tank has to be turned upside down at the time of refueling, and there are increasing complaints such as troublesome refueling or dirty hands.
[0012]
Therefore, the present inventors have provided a refueling tank that can be freely removed in the vessel, an electromagnetic pump that sends fuel from the fuel tank to the vaporizer, a vaporization section that heats and vaporizes the fuel, and a combustion that burns the vaporized fuel gas. In this case, the oil level detection mechanism is removable, but the fuel tank that is fixed to the main body is eliminated and the fuel in the fuel tank is sent directly to the combustion unit. Since the system is installed in a refueling tank, the amount of oil detection accuracy is greater due to variations in the position of the reed switch and the magnetic force of the float magnet than when installed in a fuel tank fixed to the main unit. Will greatly affect
[0013]
[Means for Solving the Problems]
Therefore, as a result of earnestly examining the measures for improving the oil amount detection accuracy in the liquid fuel combustion apparatus of the oil supply system that sends the fuel of the fuel tank directly to the combustion unit, the present inventors have adopted the following measures, It has been found that the oil amount detection accuracy is improved.
[0014]
First, as a first oil amount detection mechanism, a translucent prism body that is disposed on the side surface of the oil tank and detects the liquid level in the oil tank, and disposed on the combustion apparatus main body side facing the prism body. An oil amount detection sensor including a light emitting element and a light receiving element is provided, and a configuration in which the prism body and the oil amount detection sensor are arranged in a substantially horizontal direction is adopted.
[0015]
According to this configuration, in the direct oil supply system, the upper and lower positions of the oil tank are not misaligned because the connecting means of the oil supply path and the return oil path are securely connected in the vertical direction when the oil tank is mounted. In the horizontal direction, there is a slight gap between the oil tank and the surroundings of the main body storage when the oil tank is stored in the main body. By arranging the light emitting / receiving elements in a substantially horizontal direction at a position facing the body, the variation in the amount of incident light due to the misalignment of the fuel tank is reduced, and malfunction can be prevented.
[0016]
The number of combinations of the oil amount detection sensor and the prism body is not particularly limited. However, if the prism body and the oil amount detection sensor are arranged in a plurality of stages at intervals in the vertical direction of the fuel tank, the fuel change in the fuel tank is changed. The amount can be detected with satisfaction. In particular, in the above-described direct oil supply system, the lift pressure of the electromagnetic pump changes depending on the oil amount (liquid level height) of the oil supply tank, and the electromagnetic pump discharge amount varies. Therefore, in the direct oil supply system, in order to control the electromagnetic pump to a predetermined discharge amount, a plurality of prism bodies and oil amount detection sensors are arranged in the vertical direction of the oil tank, and the oil amount (liquid level height) of the oil tank is increased. It is important to reliably and accurately detect (S).
[0017]
The prism body can be formed of, for example, a translucent resin material. The shape of the prism body is, for example, a mountain-shaped prism body whose central portion protrudes toward the inside of the fuel tank, or both side portions of the central portion. Any prism body having an inverted chevron-shaped recess protruding into the fuel tank can be employed, and in either case, the light from the light-emitting element can be transmitted or reflected at the boundary surface depending on the presence or absence of fuel.
[0018]
When a prism body having an inverted chevron-shaped concave portion is adopted, when there is no fuel, it is reflected at the boundary surface and escapes to the side and does not enter the light receiving element, but it passes through the boundary surface even when there is fuel. Since the light does not enter the light receiving element, a reflector is placed on the back side (inside the fuel tank), and when there is fuel, the light beam that has passed through the inverted chevron boundary is reflected by the reflector, and the prism body is again attached. By adopting a configuration in which the light is transmitted and incident on the light receiving element, when there is fuel, the light from the light emitting element can be reliably reflected by the reflecting plate to be incident on the light receiving element.
[0019]
As a second oil amount detection mechanism, a float body in which a float and a reflection plate are attached to an arm that is swingably disposed in an oil supply tank, and disposed on the combustion apparatus main body side facing the reflection plate position of the float body By adopting a configuration that detects the fuel liquid level by using an oil amount detection sensor comprising a light emitting / receiving element, it is possible to reliably detect the amount of oil in the fuel tank as described above.
[0020]
If a glossy stainless steel plate is used for the reflection plate used in the first and second oil amount detection mechanisms, the light beam can be reliably reflected.
[0021]
As a third oil amount detection mechanism, a float body in which a float and a magnet are attached to an arm that is swingably disposed in an oil tank, and a lead disposed on the combustion apparatus main body side facing the magnet of the float body If a configuration including an oil amount detection sensor including a switch is employed, reliable oil amount detection can be performed as described above.
[0022]
Further, if the float body and the oil amount detection sensor in the second and third oil amount detection mechanisms are arranged in a plurality of stages at intervals in the vertical direction of the oil tank, the oil supply is performed in the same manner as in the prism type. The amount of fuel change in the tank can be accurately detected.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
(overall structure)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic front view of a petroleum fan heater equipped with a liquid fuel combustion apparatus according to the present invention, and FIG. 2 is a schematic view of the liquid fuel combustion apparatus.
[0024]
The oil fan heater body 1 includes a front plate 2 detachably provided, a top plate 3 formed integrally with the side surface, an operation unit 4 for operating operation, a blowout port 5 for blowing warm air, a ceiling An openable and closable lid 7 is provided on the right side of the upper surface of the plate 3 to allow the fuel tank 6 to be taken in and out, and is mounted and fixed to a table 8 that receives liquid fuel if it leaks.
[0025]
As shown in the figure, inside the main body 1 is a detachable fuel tank 6 for temporarily storing fuel, a pipe for sucking up fuel in the fuel tank 6 and a valve for opening and closing the passage, and this A first connecting means comprising an oil feeding joint receiver 10 for receiving a valve of the joint 9; an air valve 20 for taking in air in order to shut off the fuel feeding of the fuel feeding path connected to the oil feeding joint receiver 10; Vaporized by a tank guide 11 to which the oil feeding joint receiver 10 is attached, a vaporizer 12 that vaporizes fuel from the fuel tank 6, an electromagnetic pump 13 that sends fuel from the fuel tank 6 to the vaporizer 12, and the vaporizer 12. Burner 14 that mixes and burns fuel gas and primary combustion air, combustion chamber 15 that surrounds burner 14 that burns, partition plate 16 that partitions burner 14 and combustion chamber 15, and burner 4, a drain tank 18 that stores unburned gas from the vaporizer 12, a cooling fin 19 that cools unburned gas between the vaporizer 12 and the drain tank 18, and a drain tank 18. In the return oil path for returning the return oil sent from the carburetor 12 to the oil supply tank 6, there is provided second connection means including a return oil joint 21 on the oil supply tank side and a return oil joint receiver 22 on the combustion unit side. ing.
[0026]
As shown in FIG. 3, the fuel tank 6 has a handle 23 for carrying the fuel, a fuel cap 24 on the surface on which the handle 23 is provided, and a state in which fuel is supplied to the surface near the fuel cap 24. An oil amount meter 25 for visually recognizing the oil amount, an oil amount detection mechanism 26 provided on the surface where the oil amount meter 25 is provided, and an oil feeding joint 9 and a return oil joint provided on the other surface where the oil amount meter 25 is provided 21.
[0027]
(Configuration of oil level detection mechanism)
As shown in FIGS. 4 and 5, the oil amount detection mechanism 26 of the oil supply tank 6 is disposed on the surface of the oil supply tank 6 on which the oil amount meter 25 is provided at intervals of three stages in the vertical direction. The position can be accurately detected. Each oil amount detection mechanism 26 is disposed in each of the three detection windows 260 on the side surface of the oil supply tank, and faces the prism body 27 with a translucent prism body 27 having an inverted mountain shape toward the inside of the tank. An oil amount detection sensor 520 including a light emitting element 52 and a light receiving element 53 arranged at a position is provided, and the presence or absence of fuel is detected by using the refraction of light received by the prism body 27.
[0028]
Each detection window 260 is formed on the bottom surface of the recess 261 formed on the side surface of the fuel tank, the prism body 27 fitted in the bottom surface opening 262, the back plate 28 disposed on the back side of the prism body 27, and the prism. The seal rubber 29 is configured to seal between the body 27 and the bottom opening 262, and the cover 30 covers the seal rubber 29 and fixes it to the recess 261.
[0029]
The prism body 27 is molded from a synthetic resin having translucency, and has a flat surface on the back side, and an inverted mountain-shaped concave portion 27a in which the upper and lower ends protrude inward and the central portion recedes on the front side. A flange 27b is formed on the periphery of the projection. As shown in FIG. 5, the bottom of the inverted mountain-shaped recess 27a of the prism body 27 is formed with a minimum R to prevent the occurrence of cracks.
[0030]
The back plate 28 is formed in a U shape in a side view on the back side of the prism body 27, and a substantially triangular space portion through which fuel can flow is formed by the bottom surface portion 28 a and the concave portion 27 a of the prism body 27. The upper and lower side surfaces 28 b of the back plate 28 are processed so as not to reflect light and are in close contact with the prism body 27. In addition, on the bottom surface portion 28a of the back plate 28, on the concave portion 27a side of the prism body 27, a reflecting plate 28c made of a stainless steel plate that is easily reflected is mounted.
[0031]
The seal rubber 29 is formed in an annular shape so that it can be brought into close contact with the periphery of the opening 262 of the detection window 260, and the flange 27b of the prism body 27 and both ends of the back plate 28 are formed in the annular groove 29a formed on the inner peripheral surface thereof. It is inserted.
[0032]
The cover 30 is formed in an annular shape so as to cover the surface side of the seal rubber 29, penetrates the through hole 29 b of the seal rubber 29 from the surface side, and is fixed to the bottom surface of the tank recess 261 together with the seal rubber 29 by a screw 301.
[0033]
The prism body 27, the back plate 28, the seal rubber 29, and the cover 30 incorporated in the detection window 260 including the screw 301 are disposed at a position retracted from the tank surface so that the prism body 27 and the like are not damaged by an external member. Has been.
[0034]
As shown in FIGS. 5 and 6, the oil amount detection sensor 520 is opposed to the tank guide 11 that forms the chamber wall of the oil tank storage portion in the main body 1 and in the vicinity of the prism body 27 on the oil tank 6 side. Arranged. That is, in the state where the main body of the fuel tank 6 is mounted, the openings 521 are formed on the wall surfaces of the tank guide 11 facing the plurality of stages of prism bodies 27 on the fuel tank 6 side, and the box 522 is formed on the back side of each opening 521. The oil amount detection sensor 520 is accommodated in each box 522 by welding.
[0035]
Each oil amount detection sensor 520 includes a light emitting element 52 that irradiates light to the prism body 27, a light receiving element 53 that receives reflected light from the prism body 27, and a printed circuit board 54 on which the light emitting element 52 and the light receiving element 53 are mounted. And a case 55 for accommodating the printed circuit board 54, and the case 55 is fixed to the box 522.
[0036]
The case 55 is formed in a rectangular parallelepiped shape, and two round holes 57 are formed in the prism body facing surface with a space in the lateral direction with the partition wall 58 interposed therebetween. The light emitting element 52 and the round holes 57 are formed in the two round holes 57. The light receiving element 53 is fitted, and the periphery of the printed circuit board 54 is engaged and held in a holding recess 56 formed on the periphery of the case 55.
[0037]
Further, the light emitting element 52 and the light receiving element 53 are arranged in a pair in the horizontal direction so as to face the prism body 27, but the partition wall 58 of the case 55 has a light beam from the light emitting element 52 to receive the light receiving element 53. Is prevented from entering directly.
[0038]
Here, in the present embodiment, the oil amount detection sensor 520 is disposed at a position facing the prism bodies 27 of the plurality of stages of the oil supply tank 6, but the lower oil amount detection sensor 520 corresponds to the oil supply tank 6. It is used to inform the user that the remaining amount of fuel is low, and the upper-stage multiple oil amount detection sensors 520 appropriately detect the amount of oil in the fuel tank 6 and the discharge amount of the electromagnetic pump 13. Used to correct. That is, the lift pressure changes depending on the amount of oil in the oil supply tank 6 (the height of the liquid level), and the discharge amount of the electromagnetic pump 13 fluctuates. If the discharge amount of the pump 13 is corrected and controlled, a stable combustion state can be obtained.
[0039]
In addition, since the light emitting element 52 and the light receiving element 53 are disposed in the horizontal direction at the position facing the plurality of prism bodies 27 of the fuel tank 6, no vertical displacement of the fuel tank 6 occurs. The gap between 6 and the main body storage portion needs to have a small size when the main body of the fuel tank 6 is stored, and therefore, a slight positional deviation occurs. However, since the light emitting element 52 and the light receiving element 53 are disposed in the left and right horizontal directions at positions facing the plurality of prism bodies 27 of the fuel tank 6, it is possible to solve the problem caused by the positional deviation.
[0040]
(Configuration of connection means)
As shown in FIG. 9, an oil feed joint 9 and a return oil joint 21 that are connected to an oil feed path and a return oil path on the combustion unit side when the main body is mounted are disposed on the side surface of the oil tank 6. It is fixed via a packing 31 made of.
[0041]
As shown in FIGS. 10 and 13, the oil supply joint 9 and the return oil joint 21 are closed when the oil tank is taken out from the main body and opened when the oil tank 6 is attached to the main body. System valve mechanisms 32 and 33 are provided. As shown in FIG. 10, a suction pipe 34 is connected to the oil feeding joint 9 for sucking the fuel in the fuel tank 6 from the bottom of the tank and sending it to the electromagnetic pump 13.
[0042]
The oil feeding joint 9 includes a bottomed cylindrical joint body 39, a seal nut 41 that closes the head opening via a seal packing 40, a valve mechanism 32 built in the joint body 39, and the joint body 39. And a communication portion 39a communicating from the side to the fuel tank side.
[0043]
A communication hole 44 through which the valve rod of the valve mechanism 32 protrudes is formed at the bottom of the joint body 39, and a seal packing 48 is in close contact with a protrusion 39b around the communication hole. The material of the joint body 39 may be made of resin instead of metal.
[0044]
The valve mechanism 32 includes a valve body 36, an O-ring packing 37, and a spring 38. In the valve body 36, a valve rod 36b protrudes downward from a substantially inverted conical valve portion 36a, and a spring support rod 36c protrudes from the upper surface of the valve portion 36a. The O-ring packing 37 is in close contact with the tapered surface of the lower surface of the valve portion, and can be freely attached to and detached from the tapered bottom portion of the joint body 39. The spring 38 is interposed between the upper surface of the valve portion 36a and the lower surface of the seal nut 41, and biases the valve body 36 in the seating direction.
[0045]
A flange 39c for attaching to the tank wall surface is formed in the communication portion 39a, and a communication passage 46 is formed in the interior to communicate the inside of the valve of the joint body 39 with the inside of the tank.
[0046]
The seal nut 41 has a hexagonal head, is threaded on the side surface, and a seal packing 40 is provided.
[0047]
As shown in FIG. 10, a suction pipe 37 for sucking up fuel from the fuel tank 6 reaches near the bottom surface opposite to the handle 23 of the fuel tank 6 and has a suction port 150 at its tip, A filter 151 that does not pass through is inscribed. The suction port 150 may be provided on the side surface of the suction pipe 37 other than the bottom surface.
[0048]
As shown in FIG. 13, the return oil joint 21 is incorporated in the joint body 39, a substantially cylindrical joint body 39, a seal nut 46 in which a head opening of the joint body 39 is screwed through a seal packing 40, and the joint body 39. The valve mechanism 33 and the air valve mechanism 49, and a communication portion 39a communicating from the side of the joint main body 39 to the fuel tank side are provided.
[0049]
The joint body 39 incorporates a valve mechanism 33 below the intermediate portion and an air valve mechanism 49 above the intermediate portion. A communication hole 45 for projecting the valve rod of the valve mechanism 32 is formed at the bottom of the joint body 39, and a seal packing 48 is fitted and adhered to the protrusion 39b around the communication hole. The material of the joint body 39 may be made of resin instead of metal.
[0050]
The valve mechanism 33 includes a valve body 36, an O-ring packing 37, and a spring 38, similar to the valve mechanism of the oil feeding joint 9. In the valve body 36, a valve rod 36b protrudes downward from a substantially inverted conical valve portion 36a, a spring support rod 36c protrudes from the upper surface of the valve portion 36a, and the upper end thereof is an intermediate air valve side communication passage. It has reached 49a. The O-ring packing 37 is in close contact with the tapered surface of the lower surface of the valve portion, and can be freely attached to and detached from the tapered bottom portion of the joint body 39. The spring 38 is interposed between the upper surface of the valve portion 36a and the lower surface of the intermediate portion 39d of the joint body 39, and biases the valve body 36 in the seating direction.
[0051]
A flange 39c for attaching to the tank wall surface is formed in the communication portion 39a, and the inside of the joint body 39 and the inside of the fuel tank 6 are communicated with each other to return the return fuel from the carburetor 12 to the fuel tank 6. A return passage 47 is formed.
[0052]
The seal nut 46 has a hexagonal head, the side surface is threaded, a seal packing 40 is provided, and the air valve chamber of the joint body 39 is closed and air that takes air into the air valve chamber is provided. A hole 46a is formed.
[0053]
The air valve mechanism 49 incorporated in the air chamber includes a valve body 42 that opens and closes a communication passage 49a that communicates with the valve chamber on the valve mechanism 33 side, a spring 43 that biases the valve body 42 in the valve closing direction, It consists of an O-ring 50 fitted to the closing surface of the valve body and the joint body, and the valve body 42 is pushed upward by the upward movement of the support rod 36c of the valve mechanism 33 to open the valve. Thus, the inside and outside of the fuel tank 6 communicate with each other through the air passage 46a through the communication passage 49a and the return passage 47, and the pressure in the tank is adjusted to atmospheric pressure.
[0054]
Corresponding to the oil supply joint 9 and the return oil joint 21 on the oil supply tank 6 side, the main body side tank guide 11 is connected to the oil supply joint receiver on the lower side of the oil supply joint 9 when the oil supply tank 6 is mounted. 10, a return oil joint receiver 22 is provided below the return oil joint 21, and the oil feed joint receiver 10 and the return oil joint receiver 22 are integrally fixed. The oil feeding joint receiver 10 is provided with an air valve 20 that shuts off the supply of fuel in the oil feeding path for sending fuel from the fuel tank 6 to the electromagnetic pump 13 by taking in air.
[0055]
As shown in FIG. 12, the oil feeding joint receiver 10 includes a receiving body 60, a concave receiving portion 61 having a circular cross section that is open on the upper surface thereof and allows the small-diameter protruding cylinder 39 b of the lower end of the oil feeding joint 9 to intervene. A valve mechanism 62 disposed at a lower portion of the main body 60 and protruding from the valve hole 62a formed in the middle of the receiving main body 60 to the receiving portion 61 side. The valve hole 62a is opened and closed by the contact pressure / separation of the valve mechanism 32 of the valve mechanism 32 of the oil feeding joint 9 to open and close the oil feeding path.
[0056]
More specifically, the receiving body 60 is formed in a columnar shape, a concave receiving portion 61 is formed in the upper surface opening, a valve chamber 62d of the valve mechanism 62 is formed in the lower portion, and a bottom portion of the valve chamber 62d. A connection port 60a that communicates with the electromagnetic pump 13 is formed, and a communication passage 60b that communicates with the air valve 20 is formed at the side of the valve chamber 62d.
[0057]
An annular seal surface 61a that can be in close contact with the periphery of the small-diameter protruding cylinder 39b of the oil feeding joint 9 is formed at the upper end of the concave receiving portion 61, and a valve receiver 63 is fitted on the bottom surface. The valve receiver 63 is formed with a through hole of an operating rod 62e that extends from the valve body 62b of the valve mechanism 62 to the receiving portion 61 side through the valve hole 62a, and a lattice-shaped passage through which fuel flows. .
[0058]
The valve mechanism 62 is fitted into a valve body 62b that can be freely attached to and detached from a tapered valve seat on the valve hole side of the valve chamber 62d, a spring 62f that urges the valve body 62b in the valve closing direction, and a closing surface of the valve body 62b. And a worn O-ring 62g.
[0059]
The valve body 62b is formed in a substantially conical shape, an operating rod 62e is extended at the upper end thereof, protrudes through the valve hole 62a to the receiving portion 61 side, and an umbrella-shaped head portion 62c is formed at the upper end. The spring 62f is interposed between the head portion 62c of the valve body 62b and the valve receiver 63, and biases the valve body 62b upward in the valve closing direction. The O-ring 62g is fitted on the conical surface of the valve body 62b.
[0060]
The air valve 20 is provided in order to take in air that shuts off fuel in the oil feeding path from the fuel tank 6 to the electromagnetic pump 13 into the oil feeding path, and a valve element disposed in the air intake passage of the valve body. 20a, an electromagnetic coil 20b that is arranged on the outer periphery of the valve body and moves the valve element 20a in the valve closing direction of the passage 60b by excitation thereof, and a spring 20c that urges the valve element 20a in the valve opening direction. .
[0061]
The operation of the air valve 20 plays a role of taking in air that shuts off the fuel in the oil feeding path 300 when the air valve 20 is in a closed state during operation and is in an open state during a stop. The air valve 20 also serves to suck air in an open state when the carburetor 12 is cleaned, and to drive the electromagnetic pump 13 to send air to the carburetor 12.
[0062]
On the other hand, as shown in FIG. 14, the return oil joint receiver 22 has basically the same structure as the oil feed joint receiver 10 except that the air valve 20 does not exist. Therefore, the structure thereof will be briefly described. The return oil joint receiver 22 is, as shown in FIG. 14, a concave receiving portion 66 formed on the upper surface of the receiving body 65, and the return oil joint 21 disposed on the receiving portion 66. And a valve mechanism 67 that opens and closes by contact pressure / separation with the valve body 32 of the valve mechanism 33.
[0063]
The receiving body 65 is formed in a columnar shape, a concave receiving portion 66 is formed on the opening side of the upper surface, a valve chamber 67d of the valve mechanism 67 is formed in the lower portion, and a lower valve chamber 67d is formed in the middle portion of the receiving body 66. A valve hole 67a that communicates with the receiving portion 66 is formed. A connection port 65a communicating with the return oil path on the vaporizer side is formed on the bottom surface of the valve chamber 67d.
[0064]
An annular seal surface 66a that receives the return oil joint 21 is formed at the upper end of the concave receiving portion 66, and a through hole that passes through the operating rod 67e of the valve body 67b of the valve mechanism 67 is formed on the bottom surface of the receiving portion 66. A valve receiver 68 having a grid-like passage for surrounding fuel circulation is fitted.
[0065]
The valve mechanism 67 is detachably seated on the valve seat of the valve chamber 67d and has an upper end protruding through the valve hole 67a and protruding toward the receiving portion 66, and a spring 67f that urges the valve body 67b in the valve closing direction. And an O-ring 67g fitted to the closing surface of the valve body 67b.
[0066]
The valve body 67b is formed in a substantially conical shape, an operating rod 67e is extended at the upper end thereof, protrudes through the valve hole 67a to the receiving portion 66 side, and an umbrella-shaped head portion 67c is formed at the upper end. The spring 67f is interposed between the head 67c of the valve body 67b and the valve receiver 68, and biases the valve body 67b upward in the valve closing direction. The O-ring 67g is fitted on the conical surface of the valve body 67b.
[0067]
In the configuration of the oil supply tank 6 and the connection means 9, 10 and 21, 22, when the oil supply tank 6 is set in the tank housing chamber 1 a of the main body 1 from above, the oil supply joint 9 and the return oil joint 21 of the connection means are The O-ring 48 that is mounted at a predetermined position of the oil feeding joint receiver 10 and the return oil joint receiver 22 and is outside the small-diameter protruding portion of each joint body is connected to the seal surface 61 a of the oil feeding joint receiver 10 and the return oil joint receiver 22. It is sealed with the sealing surface 66a to be in a sealed state. At the same time, the valve mechanisms 32 and 33 of the joints and the valve bodies of the receiving side valve mechanisms 62 and 67 are pressed against each other, thereby opening the valve.
[0068]
Further, on the return oil joint 21 side, the valve body 36 is moved upward by opening the valve body 36, and the push bar 36 c on the upper side is moved upward from the valve hole 49 a of the air valve mechanism 49 to move the valve element 42. Is pushed upward, the valve hole 49a is opened. Therefore, a communication path is formed from the inside of the tank through the communication path 47 and from the valve hole 49a to the air hole 46a, the tank internal pressure is made equal to the tank external pressure, and fuel leakage due to temperature rise in the tank can be prevented.
[0069]
(Structure of oil cap)
As shown in FIG. 15, the oil filler cap 24 has a cylindrical shape with a canopy that fits into an oil filler cap 152 screwed outward on the fuel tank 6 side, and a rubber packing 154 is attached to the oil filler cap 152. Screwed through. Holes 155 and 156 of about 1.5 mm or less are formed in the cap 24 and the rubber packing 154 in order to eliminate the negative pressure state of the oil supply tank 6.
[0070]
(Configuration of vaporizer, burner, drain tank, cooling fin)
As shown in FIG. 16, the vaporizer 12 includes a vaporizing element 81 that heats and vaporizes the fuel, a nozzle 82 that ejects the fuel gas that has become a gas in the vaporizing element 81, and a needle 83 that opens and closes a hole in the nozzle 82. A solenoid valve 84 using electricity for moving the needle 83, a fuel inlet 85 for supplying fuel to the vaporizing element 81, a return port 86 for sending fuel gas inside the vaporizer 12 when the operation is stopped, a burner It is comprised from the heat recovery part 87 which collect | recovers combustion heat.
[0071]
The vaporizing element 81 is obtained by sintering fine ceramic particles into a cylindrical shape, and tar generated when the fuel is vaporized is deposited from the surface of the vaporizing element 81 toward the inside. The fuel inlet 85 of the carburetor 12 has a double structure, and a stainless steel pipe 88 is arranged on the outer side to reduce the heat conduction from the carburetor 12 in order to suppress the temperature rise of the fuel entering the carburetor 12, In order to further suppress the heat conduction transmitted to the stainless steel pipe 88, the diameter is made larger than that of the inner copper pipe 89, and the tip of the copper pipe 89 extends to a position outside the vaporizer 12.
[0072]
The solenoid valve 84 includes an electromagnetic coil 90, a movable piece 91, an adsorption piece 92, and a pressing spring 93. When the solenoid coil 84 is energized / de-energized, the movable piece 91 is attracted / detached from the attracting piece 92, and the needle 83 attached to the movable piece 91 moves, and the carburetor 12 is moved. The hole of the nozzle 82 is opened and closed.
[0073]
The burner 14 includes a mixing pipe 94 that mixes the combustion gas vaporized by the vaporizer 12 and the primary combustion air, and a flame port 95 that burns the mixed combustion gas. The electromagnetic pump 13 that sends the fuel in the fuel tank 6 to the vaporizer 12 is an oil feeding pump that is disposed with the suction side of the electromagnetic pump 13 downward and the discharge side upward.
[0074]
As shown in FIG. 17, the drain tank 18 is a container for temporarily storing the return of the fuel gas from the vaporizer 12, and when the electromagnetic pump 13 at room temperature control is stopped at the start or stop of operation, the vaporizer This is a sealed container 96 that temporarily accumulates when unburned gas remaining in the carburetor 12 due to the blockage of the 12 nozzles 82 is returned to the fuel tank 6.
[0075]
As shown in FIG. 18, the cooling fin 19 is provided with a plurality of thin fins 19a around the pipe 300 that forms the return oil path in the middle of the path connecting the vaporizer 12 and the drain tank 18. It plays the role of radiating the heat of the unburned gas returning from the vessel 12.
[0076]
(Oil fan heater operation)
Next, the operation of the oil fan heater configured as described above will be described. Open the lid 7 of the main body 1 and take out the empty fuel tank 6 by holding the handle 23 of the fuel tank 6, loosen the fuel cap 24 with the handle 23 facing upward, and remove the oil tank 6. Fuel is supplied from 26.
[0077]
When the refueling is completed, the fuel tank 6 filled with the fuel in the main body 1 is opened at the lid 7 of the main body 1 and set at a predetermined position of the main body 1, and as shown in FIG. The return oil joint 21 and these joint receivers 10 and 22 on the combustion part side are connected. At this time, the valve bodies 36 of the valve mechanisms 32 and 33 of the oil feeding joint 9 and the return oil joint 21 are pressed in contact with the operation rods 62e and 67e of the valve bodies 62b and 67b on the joint receivers 10 and 22 side. The valve holes 62a and 67a on the side of the receptacles 10 and 22 are opened.
[0078]
Further, when the oil supply tank 6 is inserted into the main body 1, the heads 62 c and 67 c of the operation rods 62 e and 67 e on the joint receiving side are brought into the bottom contact state with the valve receivers 63 and 68. The valve body 36 of the valve mechanisms 32 and 33 of the joint 21 moves upward, and a gap is generated between the O-ring 37 on the closing surface of the valve body 36 and the closing surface of the joint body 39 against the urging force of the spring 38. An oil feeding path through which fuel flows to the electromagnetic pump 13 side from this gap and a return oil path from the drain tank 18 to the fuel tank 6 are formed.
[0079]
Further, in the return oil joint 21, the air valve mechanism 49 communicating with the valve body 36 is configured such that when the oil tank 6 is set in the main body, the valve body 36 of the valve mechanism 33 is moved upward, so that the air valve mechanism 49 The valve body 42 of 49 moves upward, air is taken in from the hole 46a of the seal nut 46, and it will be in an open state.
[0080]
When the oil fan heak operation switch (not shown) is operated to turn on the power, the vaporizer 12 is heated by a vaporizer heater (not shown) attached to the vaporizer 12. At this time, the temperature of the vaporizer 12 is detected by a vaporizer thermistor (not shown), and when the vaporizer 12 is heated to a predetermined temperature, the electromagnetic pump 13 is driven and the liquid fuel in the fuel tank 6 is driven. Is sucked up through the suction pipe 34 and sent to the vaporizer 12 through the oil feeding joint 9 and the oil feeding joint receiver 10.
[0081]
The liquid fuel is gasified by the heated vaporizer 12, blown out from the flame port 95 of the burner 14, ignited in the flame port 95, and burned in the combustion chamber. At this time, based on the difference between the room temperature detected by the room temperature thermistor and the set temperature set from the operation unit, the control device controls the drive of the electromagnetic pump 13 to change the amount of liquid fuel sent to the vaporizer 12. , Adjust the amount of heat generated by combustion appropriately.
[0082]
When combustion starts and the flame sensor detects a flame current that is equal to or greater than a preset current value, the fan motor is energized, and the blower fan rotates to suck in indoor air. The rotation speed is controlled by the control device.
[0083]
The sucked indoor air takes away the obtained radiant heat in the combustion chamber 15 and blows out as hot air together with the combustion gas from the outlet 5 to the outside of the main body 1 (inside the room). Control.
[0084]
The unburned gas in the drain tank 18 exists as a gas when it is sent, but as time passes, the temperature decreases and is changed from gas to liquid and stored. When the operation is stopped or the combustion is turned off by the room temperature control, the energization of the solenoid valve 84 is turned off, and the movable piece 91 of the solenoid valve 84 is released from the adsorption piece 92 and attached to the adsorption piece 92. When the needle 83 that has closed closes the hole of the nozzle 82 of the carburetor 12, the unburned gas remaining inside the carburetor 12 passes through the clearance between the main body of the solenoid valve 84 and the needle 83. Then, the oil is sent to the drain tank 18 via the oil feeding pipe.
[0085]
At the time of ignition, the temperature of the fuel is raised in the vaporizer 12 to change it from a liquid to a gas, and the nozzle 82 is closed with the needle 83 for 1 to 2 minutes until the fuel gas is ejected from the nozzle 82. The internal pressure of the vaporizer 12 is about 0.2 kg / cm because the hole 82 is blocked. ² The pressure is applied to the inside of the drain tank 18 via the oil feed pipe, the pressure is applied to the surface of the fuel gas that has become liquid in the container 96 of the drain tank 18, and the oil level is pushed down to drain the drain tank 18. The fuel gas that has become liquid is sent from the trumpet-shaped port at the lower end of the pipe 99 provided inside the fuel tank to the fuel tank, and this fuel is supplied from the passage 65a of the return oil joint receiver 22 through the oil feed pipe. 21 is fed into the fuel tank 6 via the return passage 47 of the engine 21.
[0086]
Next, the operation of the oil amount detection mechanism 26 of the oil supply tank in the combustion state will be described. When the fuel tank 6 is full or close to it, the upper prism body 27 is also immersed in the fuel. In this state, as shown in FIG. 7, the light beam from the upper light emitting element 52 passes through the prism body 27, is reflected by the reflecting portion 28a of the back plate 28 on the back surface of the prism body 27, and returns. 53 is incident.
[0087]
Depending on the amount of light incident on the light receiving element 53, that is, converting the amount of light into voltage and sending the output voltage to the microcomputer, if it is equal to or higher than a preset voltage value, it is determined that there is fuel at the detection point of the fuel tank, The lamp remains off.
[0088]
As combustion continues and the amount of oil in the fuel tank 6 decreases, the light from the upper light-emitting element 52 is emitted from the upper light-emitting element 52 as shown in FIG. Therefore, the light beam is not incident on the light receiving element 53. As a result, the amount of light returning to the light receiving element 53 is zero, that is, the amount of light is converted into voltage, the output voltage is sent to the microcomputer, and it is determined that it is below a preset voltage value. It is determined that there is no fuel, the lamp is turned on, and the state of the residual oil amount in the fuel tank 6 is displayed with the lamp.
[0089]
When the combustion is further continued, the amount of oil in the fuel tank 6 decreases, and when the bottom prism body 27c comes out of the fuel when the fuel tank 6 is close to the bottom surface, the light from the upper light emitting element 52c is emitted. As shown in FIG. 8, the light is reflected by the boundary surface of the prism body 27c and does not enter the light receiving element 53c. As a result, the amount of light returning to the light receiving element 53c is zero, that is, the amount of light is converted into voltage, the output voltage is sent to the microcomputer, and it is determined that it is below a preset voltage value. It is determined that there is no fuel, the lamp is turned on, the state of the amount of remaining oil in the fuel tank is reduced, and the lamp that informs the user of fuel supply to the fuel tank 6 is turned on and displayed.
[0090]
As described above, since the prism body 27 and the oil amount detection sensor including the light receiving and emitting elements are arranged in the substantially horizontal direction, the variation in the amount of incident light due to the misalignment of the fuel tank is small, and no malfunction occurs. Since the prism body 27 and the oil amount detection sensor composed of the light receiving and emitting elements are arranged in a plurality of stages in the vertical direction of the fuel tank, the fuel change amount in the fuel tank can be detected satisfactorily.
[0091]
[Second Embodiment]
FIG. 19 is a diagram illustrating a state of the oil amount detection mechanism when fuel is present in the fuel tank according to the second embodiment, and FIG. 20 is a diagram illustrating a state of the oil amount detection mechanism when fuel is not present in the fuel tank. .
[0092]
As shown in the figure, the oil amount detection mechanism 26 of the present embodiment replaces the prism body inside the oil tank 6 on the surface of the oil tank 6 where the oil amount meter 25 is provided, as shown in FIGS. 19 and 20. It is characterized by the fact that the float method is adopted.
[0093]
That is, the oil amount detection mechanism 26 is provided in three steps at intervals in the vertical direction on the side surface of the oil supply tank, and each oil amount detection mechanism 26 is provided in three steps at intervals on the side surface of the oil supply tank 6 in the vertical direction. The formed detection window 263, a float body 165 disposed in the vicinity of the detection window 263 inside the fuel tank 6, and a light emitting element disposed at a position facing the float body 165 when the fuel tank is mounted on the main body. An oil amount detection sensor 520 including a light receiving element 53 and a light receiving element 53 is provided, and the presence or absence of fuel is detected using reflection of light received by the reflection plate 161 of the float body 165.
[0094]
Each detection window 263 has a bottom opening of a recess 261 formed on the side surface of the fuel tank sealed with a translucent resin cover 163 via a seal packing 164, and the surface of the translucent resin cover 163 is connected to the tank side surface. The transparent resin cover 163 is arranged so as to be flush with or slightly retracted so that the translucent resin cover 163 is not damaged from the outside.
[0095]
The float body 165 supports the float 160 having a floating structure in order to detect the presence / absence of fuel (fuel level), and supports the float 160 at the tip so that the fuel tank 6 can rotate around the base shaft 162a. And a reflector 161 attached to the detection window side surface at an intermediate position of the fulcrum bar 162. The fulcrum bar 162 is rotated around the axis by utilizing the vertical movement of the float 160 according to the fuel level. Thus, the reflecting plate 161 facing the detection window 263 receives light from the detection sensor 520 side, and detects the presence or absence of fuel by using the reflection of the light.
[0096]
As in the first embodiment, the oil amount detection sensor 520 is disposed on the tank guide 11 that forms the chamber wall of the oil tank storage unit in the main body 1 so as to face the float body 165 on the oil tank 6 side. Although not shown, the structure includes a light emitting element 52, a light receiving element 53, a printed circuit board 54 for mounting the light receiving / emitting element, and a case 55, as in the first embodiment, and the case 55 is fixed to the box 522. ing.
[0097]
However, the difference from the first embodiment is that the light emitting element 52 and the light receiving element 53 are arranged in a pair in either the vertical or horizontal direction depending on the shape direction of the reflector so as to face the float reflecting function. It is that. This is because the float body 165 is pivotable in the vertical direction around the horizontal axis, and the horizontal position shift slightly occurs from the top of the storage form of the fuel tank 6, but the vertical shift is a position shift. The problem with can be solved. Since other configurations are the same as those of the first embodiment, description thereof is omitted.
[0098]
In the above configuration, the operation of the oil amount detection mechanism 26 in the oil supply tank 6 in the combustion state will be described. When the fuel tank 6 is full or close to it, the upper float body 165 is also immersed in the fuel. In this state, the light beam from the upper light emitting element 52 is reflected by the reflecting plate 161 of the float body 165 and is incident on the light receiving element 53.
[0099]
As a result, the amount of light returning to the light receiving element 53, that is, the amount of light is converted into voltage, and the output voltage is sent to the microcomputer. If it is equal to or higher than a preset voltage value, it is determined that there is fuel at the detection point of the fuel tank 6. Thus, the lamp remains off.
[0100]
When combustion continues and the amount of oil in the fuel tank 6 decreases, the upper float body 165 is lowered with the fuel, and light rays are reflected by the reflector of the float body 165 from the upper light emitting element 52. Without going into the light receiving element 53. As a result, the amount of light returning to the light receiving element 53 becomes zero, that is, when the amount of light is converted into voltage and the output voltage is sent to the microcomputer, it becomes less than a preset voltage value. It is determined that there is no fuel, the lamp is turned on, and the state of the remaining oil amount in the fuel tank is displayed with the lamp.
[0101]
When the combustion is further continued, the amount of oil in the fuel tank 6 decreases, and when the fuel tank 6 approaches the bottom surface, the lower float body 165 rotates downward, and the light beam from the light emitting element 52c is reflected. The light travels straight without being reflected by the plate 161c and does not enter the light receiving element 53c. For this reason, the amount of light returning to the light receiving element 53c is 0, that is, when the light amount is converted into voltage and the output voltage is sent to the microcomputer, the output voltage is below a preset voltage value. It is determined that there is none, and the lamp is turned on, and the lamp for notifying the user of fuel supply to the fuel tank 6 is turned on.
[0102]
As described above, even when the float body 165 with a reflecting plate is used, the amount of residual oil in the fuel tank can be reliably detected as in the first embodiment.
[0103]
[Third Embodiment]
FIG. 21 is a diagram illustrating a state of the oil amount detection mechanism when fuel is present in the fuel tank according to the third embodiment, and FIG. 22 is a diagram illustrating a state of the oil amount detection mechanism when fuel is not present in the fuel tank. is there.
[0104]
As shown in the figure, the oil amount detection mechanism 26 of the present embodiment is provided with a float proximity switch function system in place of the prism body on the inside of the oil tank 6 on the surface of the oil tank 6 where the oil amount meter is provided. The detection operation is performed by a magnet and a reed switch.
[0105]
That is, the oil amount detection mechanism 26 is provided in three steps at intervals in the vertical direction on the side surface of the oil supply tank, and each oil amount detection mechanism 26 is provided in three steps at intervals on the side surface of the oil supply tank 6 in the vertical direction. The formed detection window 263, a float body 176 disposed in the vicinity of the detection window 263 inside the fuel tank 6, and a reed switch disposed at a position facing the float body 176 when the fuel tank is mounted on the main body. And an oil amount detection sensor 520 consisting of 175, and the presence / absence of fuel is detected by using an ON / OFF operation of a reed switch 175 that is sensitive to the magnetic field of the magnet 171 of the float body 176.
[0106]
Each detection window 263 has a bottom opening of a recess 261 formed on the side surface of the fuel tank sealed with a translucent resin cover 173 via a seal packing 174, and the surface of the translucent resin cover 173 is connected to the tank side surface. The transparent resin cover 173 is arranged so as to be flush with or slightly retracted so that the translucent resin cover 173 is not damaged from the outside.
[0107]
The float body 176 supports the float 170 having a floating body structure to detect the presence or absence of fuel (fuel level), and supports the float 170 at the distal end so that the fuel tank 6 can rotate around the proximal shaft 172a. The fulcrum bar 172 and a magnet 171 attached to the surface on the detection window side at an intermediate position of the fulcrum bar 172, and the fulcrum bar 172 is moved around the axis 172a by using the vertical movement of the float 170 depending on the fuel level. The reed switch 175 by the magnetic field of the magnet 171 facing the detection window 263 is detected to detect the presence or absence of fuel based on the presence or absence of impression.
[0108]
Similar to the first embodiment, the reed switch 175 as the oil amount detection sensor 520 is opposed to the tank guide 11 that forms the chamber wall of the oil tank storage unit in the main body 1 and the float body 176 on the oil tank 6 side. Arranged.
[0109]
The reed switch 175 is arranged in a direction opposite to the shape direction of the magnet 171 so that the vertical displacement of the fuel tank 6 does not occur. The horizontal positional deviation requires a slight gap between the fuel tank 6 and the periphery of the main body storage portion, so that a slight positional deviation occurs, but it does not cause a problem in detecting the oil amount. In contrast, the detection mechanism using the reed switch 175 and the magnet has an advantage that it is not affected by disturbance light as compared with the detection method using the light emitting / receiving element.
[0110]
Next, the operation of the oil amount detection mechanism having the above configuration will be described. When the fuel tank 6 is full or close to it, the upper float magnet function is also immersed in the fuel. In this state, the upper reed switch 175 is close to and opposed to the magnet 171, and is moved to the ON state by being impressed by the magnetic field of the magnet 171, so that a “High” signal is sent to the microcomputer. At this detection point, it is determined that there is fuel, and the lamp remains off.
[0111]
As combustion continues and the amount of oil in the fuel tank 6 decreases, the magnetic field of the magnet 171 does not affect the reed switch 175 when the upper float / magnet function is lowered together with the fuel. Is released, and is turned OFF, and a “Low” signal is sent to the microcomputer. The microcomputer determines that there is no fuel at the detection point of the fuel tank, turns on the lamp, and displays the state of the remaining oil amount in the fuel tank with the lamp.
[0112]
As the combustion continues further, the amount of oil in the fuel tank 6 decreases, and when the fuel tank 6 approaches the bottom surface of the fuel tank 6, the lower float body 176 rotates downward and the magnetic force from the magnet 171 affects the reed switch 175. The lead switch 175 is opened and turned off, and a “Low” signal is sent to the microcomputer. The microcomputer determines that there is no fuel at the detection point of the fuel tank, lights up the lamp, and lights up and displays a lamp informing the user of fuel supply to the fuel tank 6.
[0113]
As described above, even if the oil amount detection mechanism 26 is a mechanism that combines a float method and a detection operation using a magnet and a reed switch, reliable oil amount detection is performed as in the first and second embodiments. It can be performed.
[0114]
【The invention's effect】
As described above, according to the present invention, in the direct fuel supply type liquid fuel combustion apparatus, the oil amount detection mechanism using the light-transmitting prism body and the light emitting / receiving element, or the float body with the reflecting plate, Since a device using a light receiving / emitting element or a device using a float body with a magnet and a reed switch is employed, it is possible to reliably detect the amount of fuel change in the fuel tank without causing malfunction.
[Brief description of the drawings]
FIG. 1 is a partial front sectional view of an oil fan heater according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of the liquid fuel combustion apparatus of FIG.
FIG. 3 is a schematic view of the oil tank in FIG. 2;
4 is a schematic diagram of a prism body of the oil amount detection mechanism of the oil tank in FIG. 2;
5 is a schematic structural diagram of a prism body and a light emitting element of the oil amount detection mechanism of the oil tank in FIG. 4;
6 is a schematic structural diagram of the light emitting element / light receiving element in FIG. 4;
FIGS. 7A and 7B show movements of light beams of the prism body and the light emitting / receiving element in the oil amount detection mechanism when fuel is present in the fuel tank of FIG. 4, FIG. 7A is a side view thereof, and FIG.
8A and 8B show movements of light beams of the prism body and the light emitting / receiving element in the oil amount detection mechanism when there is no fuel in the fuel tank of FIG. 4, FIG. 8A is a side view thereof, and FIG.
9 is a schematic perspective view showing connecting means on the oil supply side and the return oil side in the oil supply tank of FIG. 2;
10 is a schematic diagram of the oil supply side joint of the oil supply tank of FIG. 7;
11 is a structural diagram of the oil supply side joint of FIG. 8;
12 is a structural diagram of the oil feeding side joint receiver and the air valve of FIG. 7;
13 is a structural diagram of a return oil side joint in the oil tank of FIG. 7;
14 is a structural diagram of the return oil side joint receiver of FIG. 7;
15 is a structural diagram of a fuel cap with a pressure valve of the fuel tank of FIG. 3;
FIG. 16 is a structural diagram of the burner and vaporizer of FIG.
FIG. 17 is a structural diagram of the heat pump of FIG.
18 is a structural diagram of the cooling fin of FIG.
FIG. 19 is a view showing the movement of light rays of the light emitting / receiving element and the float / reflector in the oil amount detection mechanism when there is fuel in the fuel tank according to the second embodiment of the present invention.
FIG. 20 is a view showing the movement of light beams of the light emitting / receiving element and the float / reflector in the oil amount detection mechanism when there is no fuel in the fuel tank.
FIG. 21 is a diagram showing a relationship between a reed switch and a float magnet in an oil amount detection mechanism when fuel is present in a fuel tank according to a third embodiment of the present invention.
FIG. 22 is a view showing the relationship between the reed switch and the float / magnet in the oil amount detection mechanism when there is no fuel in the oil tank.
FIG. 23 is a partially omitted front sectional view showing an example of a conventional oil fan heater.
24 is a schematic side cross-sectional view of the oil fan heater of FIG. 23. FIG.
25 is a schematic diagram of an oil amount detection mechanism in the fuel tank of FIG.
[Explanation of sign]
1 Oil fan heater body
2 Front plate
3 Top plate
4 Operation part
5 outlet
6 Refueling tank
7 Lid
8 Stand
9 Oil supply joint
10 Refueling joint receiver
11 Tank guide
12 Vaporizer
13 Electromagnetic pump
14 Burner
15 Combustion chamber
16 Partition plate
17 Burner box
18 Drain tank
19 Cooling fin
20 Air valve
21 Return oil joint
22 Return oil joint receiver
23 Handle
24 Refueling cap with pressure valve
25 Oil meter
26 Oil level detection mechanism
27 Prism body
37 Suction pipe
52 Light Emitting Element
53 Light receiving element
520 Oil level detection sensor

Claims (7)

The combustion apparatus main body includes a detachable fuel tank, an electromagnetic pump that sends fuel from the fuel tank to the vaporizer, a vaporization section that heats and vaporizes the fuel, and a combustion section that burns the vaporized fuel gas. In a liquid fuel combustion system that sends fuel from the tank directly to the combustion section,
An oil amount detection that is disposed on the side surface of the oil supply tank and includes a light-transmitting prism body that detects a liquid level in the tank, a light emitting element, and a light receiving element, and is disposed on the combustion apparatus main body side so as to face the prism body. An oil amount detection mechanism for a liquid fuel combustion apparatus, comprising: a sensor, wherein the prism body and the oil amount detection sensor are arranged in a substantially horizontal direction. The oil amount detection mechanism according to claim 1, wherein the prism body and the oil amount detection sensor are arranged in a plurality of stages at intervals in the vertical direction of the oil supply tank. 3. The oil amount detection mechanism according to claim 1, wherein the prism body includes an inverted chevron-shaped concave portion whose both sides protrude from the center portion into the oil tank, and a reflector is disposed on the inner side of the oil tank. The combustion apparatus main body includes a detachable fuel tank, an electromagnetic pump that sends fuel from the fuel tank to the vaporizer, a vaporization section that heats and vaporizes the fuel, and a combustion section that burns the vaporized fuel gas. In a liquid fuel combustion system that sends fuel from the tank directly to the combustion section,
A float body in which a float and a reflector are attached to an arm that is swingably disposed in the fuel tank, and a light emitting element and a light receiving element that are disposed on the combustion apparatus main body side so as to face the reflector of the float body An oil amount detection mechanism comprising an oil amount detection sensor. The oil amount detection mechanism according to claim 3 or 4, wherein the reflector is made of a glossy stainless steel bowl. The combustion apparatus main body includes a detachable fuel tank, an electromagnetic pump that sends fuel from the fuel tank to the vaporizer, a vaporization section that heats and vaporizes the fuel, and a combustion section that burns the vaporized fuel gas. In a liquid fuel combustion system that sends fuel from the tank directly to the combustion section,
An oil amount detection sensor comprising a float body in which a float and a magnet are attached to an arm that is swingably disposed in the oil supply tank, and a reed switch disposed on the combustion device main body side so as to face the magnet of the float body An oil amount detection mechanism characterized by comprising: The oil amount detection mechanism according to any one of claims 4 to 6, wherein the float body and an oil amount detection sensor are arranged in a plurality of stages at intervals in the vertical direction of the oil supply tank.

Images