JPH045875Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a burner fuel supply device and can be used in burners such as grain dryers and shiitake mushroom dryers.

Conventional technology and problems to be solved by the invention Conventionally, the fuel passage from the electromagnetic pump was branched, and a throttle valve was installed in the main fuel passage that supplied the fuel to the combustion dish, and the fuel was supplied to the pre-combustion chamber. A solenoid valve is provided in the ignition fuel passage, and at the time of ignition, the solenoid valve is activated to send oil from the solenoid pump to the ignition fuel passage using the resistance difference created by the throttle valve in the main fuel passage. In the case of a fuel supply system configured to supply fuel to the pre-combustion chamber, if the electromagnetic pump and electromagnetic valve are operated simultaneously at the time of ignition, a portion of the fuel sent from the electromagnetic pump will be supplied to the pre-combustion chamber. Since the fuel flows through the valve to the combustion dish, fuel accumulates in the combustion dish, and combustion in the pre-combustion chamber prevents the combustion dish from being sufficiently heated, resulting in a reduction in combustion performance. Especially when the outside temperature is low, misfires may occur.

Therefore, in this invention, the solenoid valve installed in the ignition fuel passage is placed lower than the throttle valve installed in the main fuel passage, and when igniting, the solenoid valve is operated before the electromagnetic pump, and the solenoid valve is installed in the main fuel passage. The purpose is to cause the accumulated fuel to flow down into the pre-combustion chamber through the ignition fuel passage to prevent the fuel from flowing into the combustion dish, thereby improving combustion performance.

Means for Solving the Problems This invention is an attempt to eliminate the above-mentioned drawbacks.The fuel passage 2 through which fuel is sent from the electromagnetic pump 1 that supplies fuel is divided into upper and lower sections, and the passage to the combustion dish 3 is divided into upper and lower branches. A throttle valve 5 is provided in the main fuel passage 4, and a pre-combustion chamber 6 is provided.
The ignition fuel passage 7 to the ignition fuel passage 7 is provided with a solenoid valve 8 for blocking or communicating the passage.
is provided at a lower position with respect to the main fuel passage 4, and a control device 25 is provided to switch the solenoid valve 8 to the passage 7 communication state prior to the electromagnetic pump 1 when igniting fuel is supplied to the pre-combustion chamber 6. The structure of the burner fuel supply system is as follows.

Functions and Effects of the Invention When supplying ignition fuel, the solenoid valve 8 is switched to communicate with the ignition fuel passage 7 based on a command signal from the control device 25 prior to the operation of the electromagnetic pump 1. For this reason, the ignition fuel passage 7 is communicated with the pre-combustion chamber 6, and is located at a lower level than the main fuel passage 4, so that the fuel accumulated in the main fuel passage 4 flows to the ignition fuel passage 7 side, and originally A portion of the fuel remaining in the ignition fuel passage 7 flows out to the pre-combustion chamber 6 side.

Next, when a drive signal is applied to the electromagnetic pump 1, the fuel transferred to the ignition fuel passage 7 as described above is forcibly supplied to the pre-combustion chamber 6, and the ignition member in operation is ignited based on the drive signal as appropriate. Move.

After the above supply is performed for a short time, the electromagnetic pump 1 is stopped. Therefore, although the main fuel passage 4 side is newly filled with fuel, it hardly reaches the combustion dish 3.

When the combustion plate 3 is heated by pre-combustion, the solenoid valve 8 is reset and the electromagnetic pump 1 is set to be driven again.The fuel flows through the main fuel passage 4 and the throttle valve 5 to the combustion plate. is supplied to the main combustion chamber.

As mentioned above, the fuel supply to the pre-combustion chamber is partially covered by the fuel remaining in the main fuel passage 4, and after becoming empty due to the outflow to the ignition fuel passage 7 side, the electromagnetic pump 1 is activated for a short time. Although the fuel is driven, the fuel branched and supplied to the main fuel passage 4 side is used for fuel filling and is not supplied to the combustion dish, which can eliminate the above-mentioned drawbacks.

Embodiment In the illustrated example, the burner 9 has a combustion chamber 11 in the upper part of the mounting plate 10, a pre-combustion chamber 6 in the lower part, and communicates with the hot air path 32 of the dryer.

The pre-combustion chamber 6 is constructed by fixing a box-shaped saucer 12 with one side open at the bottom of a mounting plate 10.
A donut-shaped ignition cloth 13 with a part protruding from the bottom surface of the ignition cloth 13 is provided with the protrusion of the ignition cloth 13 facing the opening of the saucer 12, and an ignition heater is attached to the protrusion of the ignition cloth 13. There are 14.

An opening/closing lever 15 is rotatably supported in the opening of the saucer 12, and an air control valve 16 is fixed to the opening/closing lever 15.

The main fuel supply shaft 1 is located at the center of the bottom of the saucer 12.
7 is fixed in a vertically protruding state, an oil passage 18 is passed through the center of this fuel supply shaft 17, and a combustion dish 3 having a dish shape and a hole in the bottom is attached to the upper part of the fuel supply shaft 17. A fuel nozzle 19 is provided in the center of the dish 3.

The fuel nozzle 19 has an oil hole passing through the center and a cross groove communicating with the oil hole on the upper surface.
The oil hole and the oil hole 18 of the fuel supply shaft 17 are configured to communicate with each other.

The fuel nozzle 19 is provided with a dish-shaped nozzle cover 2.
0, and fuel is ejected from between the outer diameter part of the fuel nozzle 19 and the inner diameter part of the nozzle cover 20 and is supplied to the combustion dish 3.

A combustion body 21 is mounted on the nozzle cover 20,
The combustion body 21 is provided with a wall that slopes radially from the central convex portion toward the bottom surface, and there is a certain period of time between the outer circumferential portion of the bottom surface of the combustion body 21 and the inner diameter portion of the combustion dish 3. has been established.

A hot air guide tube 22 having a cylindrical shape and an open end curved forward is mounted on the mounting plate 10 above the combustion body 21, and the inner diameter of the hot air guide tube 22 and the outside of the combustion body 21 are connected. A certain distance is provided between the hot air guide tube 22 and the heat diffusion plate 2 at the opening at the tip of the hot air guide tube 22.
3 is installed.

Combustion air is introduced from the opening of the tray 12 by an exhaust fan (not shown) of the dryer, and
Ventilation is conducted to the hot air guide tube 22 from between the combustion plate 3 and the hot air guide tube 22, and the hot air guide tube 22 is passed through the hole at the bottom of the combustion plate 3 and the hole at the bottom of the combustion body 21.
The structure is such that ventilation is provided to the building.

The fuel supply device includes an electromagnetic pump 1 that controls the flow rate of fuel in a fuel tank 24 and sends the fuel, and a fuel passage 2 through which fuel is fed from the electromagnetic pump 1 is branched vertically to form a main fuel passage 4 on the higher side. An ignition fuel passage 7 is provided on the lower side.

A throttle valve 5 is provided in the main fuel passage 4, and the main fuel passage 4 communicates with the combustion dish 3 via an oil passage 18 of the fuel supply shaft 17 and a fuel nozzle 19. Further, the throttle valve 5 is provided in the ignition fuel passage 7.
A solenoid valve 8 is provided below the ignition fuel passage 7, and the outlet of the ignition fuel passage 7 is located above the ignition cloth 13 on the saucer 12 of the pre-combustion chamber 6.

The control device 25 has a CPU 26, an input circuit 27, and an output circuit 28.

The input information of the CPU 26 is the operation information 30 given from the start switch 29 via the input circuit 27.
There is. A drive command signal given from the CPU 26 is given to the electromagnetic pump 1, electromagnetic valve 8, and ignition heater 14 via the output circuit 28, respectively. The control program built into the memory 31, when the operation information 30 is given to the CPU 26 from the start switch 29, gives a command signal to the solenoid valve 8 and the ignition heater 14 for a predetermined time, and then gives a drive command signal to the solenoid pump 1. After a predetermined period of time is given, these command signals are interrupted, and then control is performed to give a drive command signal to the electromagnetic pump 1.

The effect of the above example will be explained.

Operation information 30 is obtained by operating the start switch 29.
is given to the CPU 26 via the input circuit 27, the output circuit 28 outputs the solenoid valve 8 and the ignition heater 14.
A command signal is applied for a predetermined period of time, the solenoid valve 8 is switched to the passage 7 communication state, that is, the oil supply side, and the ignition heater 14 is energized.

Due to the passage 7 communicating with each other, the fuel accumulated in the high-level main fuel passage 4 flows to the low-level ignition fuel passage 7, and a portion of the fuel accumulated in the ignition fuel passage 7 is transferred to the pre-combustion chamber 6.
It flows down to the ignition cloth 13 section and is ignited by the ignition heater 14.

Next, a drive command signal is given to the electromagnetic pump 1, but due to the existence of the throttle valve 5, the fuel mainly flows from the fuel passage 2 to the ignition fuel passage 7 side, and additional fuel is supplied to the pre-combustion chamber 6 side, and the pre-combustion continues. The combustion dish 3 and the combustion body 21 are heated by this. Note that a portion of the fuel branched from the fuel passage 2 and supplied to the main fuel passage 4 is exclusively used to fill the passage 4.

The command signals to the electromagnetic valve 8 and the electromagnetic pump 1 are interrupted after a predetermined period of time has elapsed, but during this time the electromagnetic valve 8 returns to the state where the passage 7 is blocked and pre-combustion continues.

Next, when a re-driving signal is given to the electromagnetic pump 1, all of the fuel is supplied to the main fuel passage 4 side, and is supplied into the combustion dish 3 via the throttle valve 5, the oil passage 18, and the fuel nozzle 19. . The fuel that has reached the combustion dish 3 is vaporized by combustion in the pre-combustion chamber 6 and main combustion is started, and hot air is ejected from the opening at the tip of the hot air guide cylinder 22.

[Brief explanation of drawings]

The figure shows one embodiment of this invention.
The figure is a hydraulic circuit diagram, FIG. 2 is a block diagram of the control device, and FIG. 3 is a side view. In the figure, numeral 1 is the electromagnetic pump, 2 is the fuel passage, and 3 is the electromagnetic pump.
4 is a combustion dish, 4 is a main fuel passage, 5 is a throttle valve, 6 is a pre-combustion chamber, 7 is an ignition fuel passage, and 8 is a solenoid valve.

Claims (1)

[Scope of utility model registration request] A fuel passage 2 through which oil is fed from an electromagnetic pump 1 that supplies fuel is branched vertically, and a throttle valve 5 is provided in the main fuel passage 4 leading to the combustion dish 3, and an ignition fuel passage 7 leading to the pre-combustion chamber 6. is provided with an electromagnetic valve 8 for blocking or communicating the passage, and the ignition fuel passage 7 is provided at a lower position with respect to the main fuel passage 4, and when supplying ignition fuel to the pre-combustion chamber 6, the electromagnetic pump 1
A burner fuel supply device comprising a control device 25 for switching the electromagnetic valve 8 to the communication state of the ignition fuel passage 7 prior to the above.