JP2019219084A - Fuel supply device - Google Patents

Abstract

To reduce noise of a fuel supply device including a scooping-up pump.SOLUTION: A fuel supply device includes a storage tank 15 for storing a fuel oil to be supplied to a combustion portion 5, a scooping-up pump 18 disposed on a tank cover 19 of the storage tank 15 and supplying the fuel oil from an external tank to the inside of the storage tank 15, and a supply pipe 21 connected to the scooping-up pump 18 at one end and inserted into the storage tank 15 through a hole portion 23 formed on the tank cover 19 at the other end. The supply pipe 21 has the shape including a rising portion 21a directed to a vertical upper part from one end, a separation portion 21b directed in a direction separating from an upper end of the rising portion 21a in a plane view, a pull-down portion 21c directed downward from a terminal end of the separation portion 21b, a return portion 21d directed in an approaching direction in a plane view from a lower end of the pull-down portion 21c, and a terminal end portion 21e directed vertically downward from a terminal end of the return portion 21d and inserted into the storage tank 15.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fuel supply device provided with a pump.

  Conventionally, in a fuel supply apparatus of this type, as shown in Patent Document 1, a combustion unit for burning fuel, a fuel pump for supplying fuel to the combustion unit, and a fuel supply for the combustion unit A storage tank for storing the fuel oil to be supplied, a pump for supplying fuel from an external tank into the storage tank, and an inverted U-shaped supply pipe for feeding the fuel discharged from the pump to the storage tank. There was something to prepare.

Japanese Patent No. 2870221

  However, in this conventional apparatus, there is a problem in that the vibration caused by the driving of the pump is amplified by the inverted U-shaped supply pipe and noise is generated.

  In order to solve the above-described problems, the fuel supply device of the present invention includes a storage tank that stores fuel oil supplied to a combustion unit, a tank lid that covers an upper surface of the storage tank, and a fuel tank that is provided in the tank lid. A fuel pump for supplying fuel, a pump for supplying fuel from an external tank into the storage tank, an oil level sensor provided on the tank lid for detecting an oil level in the storage tank, and one end for the pumping A supply pipe connected to a pump, the other end of which is inserted into the storage tank through a hole opened to the tank lid, wherein the supply pipe is a rising part vertically upwardly extending from the one end. A detached portion that is directed from the upper end of the rising portion in a direction away from the pump in a plan view, a lowered portion that is directed downward from the end of the separated portion, and the pumped portion that is viewed from the lower end of the lowered portion in a plan view. A return portion toward the direction approaching to the lower pump, and a shape and a terminal end which is inserted into the reservoir tank facing vertically downward from the end of said return Ri unit.

  Further, a cylindrical cushion member is interposed in the hole of the tank lid, and the inner diameter of the cylindrical cushion member is larger than the outer diameter of the terminal end of the supply pipe.

  According to the present invention, the vibration caused by the driving of the pump is dispersed by the lowering portion that moves downward from the end of the separated portion and the return portion that moves from the lower end of the lowering portion to approach the pump in plan view, and noise is generated. Can be reduced.

Schematic configuration diagram of one embodiment of the present invention Sectional view of the fuel supply device of the same embodiment

Next, a heater 1 using the fuel supply device of the present invention will be described with reference to the drawings.
Reference numeral 2 denotes a housing of the heater 1, reference numeral 3 denotes a bottom plate of the housing 2, and a lower receiving tray in a shallow container shape having a rising portion 3 a on a peripheral edge; It is.

  Reference numeral 5 denotes a combustion unit that burns fuel oil such as kerosene, 6 denotes a fuel supply device that supplies fuel oil to the combustion unit 5, 7 denotes a combustion fan that supplies combustion air taken into the combustion unit 5 from outside, and 8 denotes a combustion unit 5 An ignition device having a spark rod for flying sparks for ignition, and a flame detection device 9 having a frame rod for detecting the presence or absence of a flame in the combustion portion 5.

  Reference numeral 10 denotes a combustion cylinder in which a burner head 5a in which a flame of the combustion part 5 is formed faces the combustion chamber 10a, and 11 is disposed in an upper portion of the combustion cylinder 10 and is used for performing radiant heating by red heating by combustion heat. A red heat cylinder, 12 is a heat exchanger formed at the upper part of the combustion cylinder 10 and exchanges heat between combustion heat and indoor air, 13 is an exhaust cylinder for releasing the combustion exhaust gas after heat radiation by the heat exchanger 12 to the outside, A blower fan 14 blows room air to the heat exchanger 12.

Next, the fuel supply device 6 will be described in detail.
The fuel supply device 6 includes a storage tank 15 that stores the fuel oil supplied to the combustion unit 5, a fuel pump 16 that supplies the fuel oil in the storage tank 15 to the combustion unit 5, and an oil level of the fuel oil in the storage tank 15. And a pump 18 for supplying fuel oil pumped from an external tank (not shown) to a predetermined height when the oil level in the storage tank 15 falls below a predetermined height. Have. Since the pump 18 is used as a mechanism for supplying fuel to the storage tank 15, the restriction on the height difference between the external tank and the storage tank 15 (restriction on the installation height of the external tank) can be greatly reduced.

  The storage tank 15 is disposed on the lower tray 3, and the upper surface of the storage tank 15 is closed by a tank lid 19 made of sheet metal, and the fuel pump 16 and the oil level sensor are mounted on the tank lid 19 directly above the storage tank 15. 17 is attached, and a pump 18 is attached to a tank lid 19 at a position separated from directly above the storage tank 15. The fuel pump 16 has a suction end 16 a provided in the storage tank 15, and supplies the fuel in the storage tank 15 to the combustion unit 5 via the fuel pipe 20 in an amount corresponding to the amount of combustion.

  The oil level sensor 17 includes a float 17b having a magnet movably up and down on a column 17a, a low oil level reed switch 17c for detecting a predetermined low oil level in the column 17a, and a predetermined level. A high oil level reed switch 17d for detecting a high oil level is provided. Here, the predetermined low oil level is a lower limit oil level of the constant oil level maintained by the storage tank 15, and the predetermined high oil level is an oil level higher than the upper limit oil level of the constant oil level maintained by the storage tank 15. .

  The pump 18 is connected to the storage tank 15 via a supply pipe 21 at an upper discharge end, and supplies fuel from an external tank whose lower suction end is installed outdoors. It is connected to an oil feed pipe 22 that supplies oil, and operates to supply fuel oil from the external tank into the storage tank 15, and to shut off so that fuel oil from the external tank is not supplied into the storage tank 15 when stopped. It is.

  The supply pipe 21 is made of a copper pipe, and has a rising portion 21a vertically upward from the discharge end of the pump 18 and a separation portion 21b from the upper end of the rising portion 21a in a direction away from the pump 18 in plan view. A lowering portion 21c downward from the end of the separating portion 21b, a return portion 21d from the lower end of the lowering portion 21c in a direction approaching the pump 18 in plan view, and a storage tank 15 vertically downward from the end of the return portion 21d. And a terminal portion 21e inserted into the inside.

  The tank lid 19 has an opening 23 through which the supply pipe 21 is inserted, and a cylindrical cushion member 24 made of soft rubber is attached to the opening 23. The inner diameter of the cushion member 24 is larger than the outer diameter of the terminal end 21 e of the supply pipe 21. Therefore, the terminal end 21 e of the supply pipe 21 is not in contact with the cushion member 24 without being fixed.

  Next, reference numeral 25 denotes a control unit for controlling the heater 1, which comprises a microcomputer in which a program is stored in advance, and detects values of various sensors such as the flame detection device 9 and the oil level sensor 17 and outputs of the operation switch 4b. Is input to control the operation of the display unit 4a, the combustion fan 7, the ignition device 8, the blower fan 14, the fuel pump 16, and the pumping pump 18.

  Then, when the operation switch 4b is operated and there is an instruction to start the heating operation, the control unit 25 drives the fuel pump 16, the combustion fan 7, and the blower fan 14 so that the fuel oil from the fuel supply device 6 and the combustion fan 7 Is supplied to the combustion unit 5 to drive the ignition device 8 to start combustion, and the combustion gas from the combustion unit 5 exchanges heat with the indoor air in the heat exchanger 12 to become combustion exhaust gas. While passing through the exhaust pipe 13 and being exhausted to the outside, the indoor air is heated by the heat exchanger 12 by the blower fan 14 and blown out from the hot air outlet (not shown) to perform heating.

  In the fuel supply device 6, when the oil level decreases during the heating operation and the low oil level reed switch 17c detects the magnet of the float 17b, the control unit 35 starts driving the pump 18 and starts counting time. When the predetermined time has elapsed, the driving of the pump 18 is stopped to keep the inside of the storage tank 15 at a constant oil level. Here, the control unit 35 constantly monitors the output of the oil level sensor 17 regardless of whether the heating operation is in operation or stopped.

  When the operation switch 4b is operated and there is an instruction to stop the heating operation, the control unit 25 stops the fuel pump 16 and the combustion fan 7 to stop the combustion, and then drives the combustion fan 7 again, and The driving of the combustion fan 7 and the blowing fan 14 is continued until the time elapses, and when the inside of the device is cooled, the driving of the combustion fan 7 and the blowing fan 14 is stopped and the operation is terminated.

  As described above, the vibration caused by the driving of the pump 18 is transmitted to the supply pipe 21 having one end fixed to the pump 18, and the supply pipe 21 is moved from the pump 18 in the order of the fuel oil discharge flow. After heading upward at the rising part 21a, heading away from the pump 18 in the horizontal direction by the separating part 21b, then heading downward at the lowering part 21c, approaching the pump 18 at the return part 21d, and finally Since it is shaped to be inserted downward into the storage tank 15 at the end portion 21e at the end, the vibration is considered to be effectively dispersed by the shape that returns once away from the pump 18 so that the conventional reverse The noise caused by the pump 18 could be reduced as compared to the U-shaped supply pipe.

  Further, since the end portion 21e is not in contact with the cushion member 24, the vibration of the supply pipe 21 is not transmitted to the storage tank 15, so that noise caused by the pump 18 can be reduced. Even when it comes into contact with the cushion member 24, the metal-to-metal contact is avoided, and the vibration of the supply pipe 21 is reduced by the soft rubber cushion member 24 and transmitted to the storage tank 15. This can suppress an increase in noise caused by the noise.

  Here, the fuel supply device 6 using the supply pipe 21 of the present invention pumps more than the present invention and Comparative Example 1 in which the inverted U-shaped supply pipe is extended about 1.5 times upward. It has been confirmed that the noise caused by the pump 18 could be reduced. Further, when comparing the present invention with the comparative example 2 in which the length of the separated portion 21b of the supply pipe 21 of the present invention is extended to about 1.5 times the embodiment of FIG. 2, the noise caused by the pump 18 is reduced. It has been confirmed that there is no significant difference in size.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without changing the gist.

5 Combustion unit 15 Storage tank 16 Fuel pump 17 Oil level sensor 18 Pumping pump 19 Tank lid 21 Supply pipe 21a Start-up unit 21b Separation unit 21c Pull-down unit 21d Return unit 21e Terminal unit 23 Hole 24 Cushion member

Claims (2)

A storage tank for storing fuel oil supplied to the combustion unit,
A tank lid for closing the upper surface of the storage tank,
A fuel pump provided on the tank lid and supplying fuel to the combustion section;
A pump for supplying fuel from an external tank into the storage tank;
An oil level sensor provided on the tank lid to detect an oil level in the storage tank;
A supply pipe which is connected to the pump at one end, and which is inserted into the storage tank through a hole opened at the tank lid at the other end,
The supply pipe is
A rising part vertically upward from the one end,
A detached portion facing in a direction away from the pump in a plan view from the upper end of the rising portion;
A pulling-down portion that goes downward from the end of the separating portion;
A return portion that is directed from the lower end of the lowering portion to a direction approaching the pump in plan view,
A fuel supply device having a shape that includes a terminal portion which is inserted vertically into the storage tank from a terminal end of the return portion toward a vertically downward direction. A cylindrical cushion member is interposed in a hole of the tank lid, and an inner diameter of the cylindrical cushion member is larger than an outer diameter of a terminal end of the supply pipe. Item 2. The fuel supply device according to Item 1.

Images