JP6942093B2 - Fuel supply device - Google Patents

Description

The present invention relates to a fuel supply device including a pump.

Conventionally, in this type of fuel supply device, as shown in Patent Document 1, a combustion unit that burns fuel oil, a fuel pump that supplies fuel oil to the combustion unit, and a fuel pump that supplies the fuel oil to the combustion unit are supplied to the inside of the housing. A storage tank for storing the fuel oil to be produced, a pump pump for supplying the fuel oil from the external tank into the storage tank, and an inverted U-shaped supply pipe for sending the fuel oil discharged from the pumping pump to the storage tank. There was something to prepare.

Japanese Patent No. 2870221

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

In order to solve the above problems, the fuel supply device of the present invention has a storage tank for storing fuel oil supplied to the combustion unit, a tank lid for closing the upper surface of the storage tank, and the combustion unit provided on the tank lid. A fuel pump that supplies fuel oil, a pump that supplies fuel oil from an external tank into the storage tank, an oil level sensor that is provided on the tank lid and detects the oil level in the storage tank, and one end of the pumping A supply pipe connected to a pump and the other end of which is inserted into the storage tank through a hole opened in the tank lid is provided, and the supply pipe is a rising portion vertically upward from the one end. The pumping pump from the upper end of the rising portion in a plan view from the lower end of the pulling-down portion, and the pulling-down portion downward from the end of the separating portion, and the pumping pump in a plan view from the lower end of the pulling-down portion. The shape is provided with a return portion that tends toward the return portion and a terminal portion that is inserted vertically downward from the end of the return portion and is inserted into the storage tank.

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

According to the present invention, the vibration caused by the drive of the pump is dispersed by the pulling portion downward from the end of the remote portion and the return portion from the lower end of the pulling portion toward the pump pump in a plan view, and noise is generated. Can be reduced.

Schematic block diagram of one embodiment of the present invention Cross-sectional view of the fuel supply device of the same embodiment

Next, the heater 1 using the fuel supply device of the present invention will be described with reference to the drawings.
Reference numeral 2 is a housing of the heater 1, 3 is a bottom plate of the housing 2, and 2 is a shallow container-shaped lower tray having a rising portion 3a on the peripheral edge, and 4 is an operation panel having a display portion 4a and an operation switch 4b. Is.

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

Reference numeral 10 denotes a combustion cylinder in which the burner head 5a on which the flame of the combustion unit 5 is formed faces and forms a combustion chamber 10a. A red hot cylinder, 12 is a heat exchanger formed on the upper part of the combustion cylinder 10 to exchange heat between combustion heat and indoor air, and 13 is an exhaust cylinder for discharging the combustion exhaust gas after heat dissipation to the outside by the heat exchanger 12. Reference numeral 14 denotes a blower fan that blows indoor 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 for storing the fuel oil supplied to the combustion unit 5, a fuel pump 16 for supplying the fuel oil of the storage tank 15 to the combustion unit 5, and the oil level height of the fuel oil in the storage tank 15. The oil level sensor 17 for detecting the above, and the pump 18 for supplying the fuel oil pumped from the outdoor external tank (not shown) to the predetermined height when the oil level in the storage tank 15 drops below the predetermined height. I have. Since the pump 18 is used as a mechanism for supplying fuel to the storage tank 15, the limitation on the height difference between the external tank and the storage tank 15 (the limitation on the installation height of the external tank) can be significantly relaxed.

The storage tank 15 is arranged 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. The tank lid 19 directly above the storage tank 15 has a fuel pump 16 and an oil level sensor. 17 is attached, and the pump 18 is attached to the tank lid 19 at a portion detached from directly above the storage tank 15. In the fuel pump 16, a suction end 16a is provided in the storage tank 15, and fuel oil in the storage tank 15 is supplied to the combustion unit 5 via the fuel pipe 20 in an amount corresponding to the amount of combustion.

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

In the pump 18, the discharge side end located at the upper part is connected to the storage tank 15 via the supply pipe 21, and the suction side end located at the lower part sends fuel oil from an external tank installed outdoors. It is connected to the oil supply pipe 22 for oiling, and when it operates, it supplies fuel oil from the external tank into the storage tank 15, and when it stops, it closes so that the fuel oil from the external tank is not supplied into the storage tank 15. 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 separating portion 21b facing away from the pump 18 in a plan view from the upper end of the rising portion 21a. , A pull-down portion 21c that goes downward from the end of the separation part 21b, a return part 21d that goes toward the pump 18 in a plan view from the lower end of the pull-down part 21c, and a storage tank 15 that goes vertically downward from the end of the return part 21d. It has a shape provided with a terminal portion 21e inserted therein.

A hole 23 for inserting the supply pipe 21 is opened in the tank lid 19, and a tubular cushion member 24 made of soft rubber is attached to the hole 23. The inner diameter of the cushion member 24 is larger than the outer diameter of the end portion 21e of the supply pipe 21. Therefore, the end portion 21e of the supply pipe 21 is not fixed and is in a non-contact state with the cushion member 24.

Next, reference numeral 25 denotes a control unit for controlling the heater 1, which is equipped with 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 pump pump 18.

Then, when the operation switch 4b is operated and an instruction to start the heating operation is given, the control unit 25 drives the fuel pump 16, the combustion fan 7, and the blower fan 14, and the fuel oil from the fuel supply device 6 and the combustion fan 7 are driven. The combustion air from the combustion unit 5 is supplied to the combustion unit 5, drives the ignition device 8 to start combustion, and the combustion gas from the combustion unit 5 is heat-exchanged with the indoor air by the heat exchanger 12 to become combustion exhaust gas. While the indoor air is discharged to the outside through the exhaust pipe 13, the indoor air is heated by the heat exchanger 12 by the blower fan 14 and blown out from the warm air outlet (not shown) for heating.

In the fuel supply device 6, when the oil level drops 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 time counting. When a predetermined time elapses, the pumping pump 18 is stopped to be driven so that the inside of the storage tank 15 is kept 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 an instruction to stop the heating operation is given, the control unit 25 stops the fuel pump 16 and the combustion fan 7 to stop the combustion, and then re-drives the combustion fan 7 and determines a predetermined value. The combustion fan 7 and the blower fan 14 are continuously driven until the time elapses, and when the inside of the equipment is cooled, the drive of the combustion fan 7 and the blower fan 14 is stopped to end the operation.

In this way, the vibration caused by driving the pump 18 is transmitted to the supply pipe 21 whose one end is fixed to the pump 18, but the supply pipe 21 is transmitted from the pump 18 in the order of the fuel oil discharge flow. After heading upward at the start-up section 21a, heading horizontally away from the pump 18 by the separation section 21b, then heading downward at the pull-down section 21c, approaching the pumping pump 18 at the return section 21d, and finally. Since the shape is such that the terminal portion 21e is inserted downward into the storage tank 15, the vibration is considered to be effectively dispersed by the shape of the pump 18 once separated from the pump 18 and returned. Compared with the U-shaped supply pipe, the noise caused by the pump 18 could be reduced.

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, the noise caused by the pumping pump 18 can be reduced, and the supply pipe 21 can be reduced. Even if it comes into contact with the cushion member 24, contact between metals is avoided, and the vibration of the supply pipe 21 is reduced by the cushion member 24 made of soft rubber and transmitted to the storage tank 15, so that the pump 18 It is possible to suppress the increase in noise caused by the above.

Here, even when compared with the present invention and Comparative Example 1 in which the inverted U-shaped supply pipe is extended about 1.5 times at the top, the fuel supply device 6 using the supply pipe 21 of the present invention pumps up. It has been confirmed that the noise caused by the pump 18 can be reduced. Further, comparing the present invention and 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 that of the embodiment of FIG. 2, the noise caused by the pump 18 is generated. It has been confirmed that there is no significant difference in size.

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

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

Claims (2)

A storage tank that stores the fuel oil supplied to the combustion section,
A tank lid that closes the upper surface of the storage tank and
A fuel pump provided on the tank lid and supplying fuel oil to the combustion portion,
A pump that supplies fuel from an external tank into the storage tank,
An oil level sensor provided on the tank lid to detect the oil level in the storage tank, and
One end is connected to the pump, and the other end is provided with a supply pipe inserted into the storage tank through a hole opened in the tank lid.
The supply pipe
A rising part that goes vertically upward from one end,
A remote portion from the upper end of the riser portion toward a direction away from the pump in a plan view, and a remote portion.
A pull-down portion that goes downward from the end of the detached portion,
A return portion from the lower end of the pull-down portion toward the pumping pump in a plan view, and a return portion.
A fuel supply device characterized in that the shape is provided with a terminal portion inserted vertically downward from the end of the return portion and inserted into the storage tank. A tubular cushion member is interposed in the hole of the tank lid, and the inner diameter of the tubular cushion member is larger than the outer diameter of the end portion of the supply pipe. Item 1. The fuel supply device according to item 1.

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