JPH02154909A - Device for driving nozzle cleaning rod of burner - Google Patents

Abstract

PURPOSE:To fix and maintain a nozzle cleaning rod at a nozzle position and a reverse nozzle position even if any action from the outside is not given by providing fixed permanent magnets for adsorbing the base end portion of the nozzle cleaning rod. CONSTITUTION:The base end portion of a nozzle cleaning rod 10 is movably supported in the center portion of a housing 20, a drive portion 11 composed of a metal body is connected to the reverse nozzle side of the cleaning rod 10 and the magnetic force of drive coils 40 and fixed permanent magnets 50 provided in the inside of the housing 20 is acted on respectively. Accordingly, the nozzle cleaning rod 10 is fixed and maintained at a nozzle position A and a reverse nozzle position B by the magnetic suction force of the fixed permanent magnet 50 even if the supply of electric power for the drive coil 40 is stopped. Thereby, the drive coil 40 is miniaturized to produce a small-sized and high performance oil fan heater at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a nozzle cleaning rod drive device for a combustor used in oil fan heaters and the like.

<Prior Art> A conventional nozzle cleaning rod drive device for a combustion machine will be described using a petroleum fan heater as an example with reference to FIG. 5 (hereinafter simply referred to as the nozzle cleaning rod drive device).

The nozzle cleaning rod drive device is a nozzle cleaning rod 10 shown in the figure.
, b direction to open/close and clean a nozzle (not shown) connected to a so-called Bunsen type vaporizer. That is, when the nozzle cleaning rod 10 is located on the anti-nozzle side (anti-nozzle position), the petroleum gas generated in the vaporizer will be ejected from the nozzle toward the burner side.
On the other hand, when the nozzle cleaning stick 10 is located on the nozzle side (nozzle position), the oil gas is blocked by the nozzle cleaning stick 10. In addition, the nozzle oil and gas flow path is cleaned in the process of alternately moving the nozzle cleaning rod 10 between the anti-nozzle position and the nozzle position. This will be explained in more detail below. Nozzle cleaning stick 1
0 is movably supported at the center of the ring-shaped housing body 20, and is biased in the direction b by a spring member 30 fixed to the center of the housing body 20. , is returned in the direction a by the magnetic force of the drive coil 40 provided inside the housing body 20. In other words, when the driving coil 40 is energized, a suction force acts on the nozzle cleaning rod 10, which is a metal body, and overcomes the elastic force of the spring member 30, causing the nozzle cleaning rod 10 to move in the direction a and be fixed at the nozzle position. become. Then, when the power supply to the drive coil 40 is stopped,
The nozzle cleaning rod 10 moves in the direction b due to the urging force of the spring member 30 and is fixed at a position opposite to the nozzle. In addition, 60 in the figure is a valve for guiding the petroleum gas remaining inside the vaporizer to another exhaust route when the fire is extinguished.
2 shows a circuit configuration in which commercial AC is rectified by a diode bridge 723, and the generated DC voltage is applied to the drive coil 40.

<Problems to be Solved by the Invention> However, in the case of the above conventional example, the nozzle cleaning rod 10 cannot be fixed and maintained at the nozzle position unless the drive coil 40 is continuously energized. Therefore, the drive coil 40 must have a structure that can withstand this energization time, and as a result, the drive coil 40 becomes larger and more expensive. Furthermore, as the trend toward smaller kerosene fan heaters progresses, the distance between the housing body 20, etc., and other devices that make up the kerosene fan heater will become closer.
Another disadvantage is that the electromagnetic vibration of 0 is transmitted to the above-mentioned equipment, and as a result, rumbling and abnormal noise are likely to occur. These drawbacks are a very big obstacle in manufacturing and developing a small, high-performance kerosene fan heater at low cost.

The present invention has been devised in view of the above circumstances, and provides a nozzle cleaning rod drive device that is improved so that the nozzle cleaning rod can be fixed and maintained at the nozzle position and the anti-nozzle position without any external action. It is intended to.

Means for Solving the Problems> A nozzle cleaning rod drive device according to the present invention includes a housing body that is fixed to a nozzle portion of a combustor and movably supports a nozzle cleaning rod between a nozzle position and a counter-nozzle position. a driving means provided on the housing body to move the nozzle cleaning rod alternately in the nozzle position direction and a direction opposite to the nozzle position; and a fixing device provided on the housing body for suctioning the base end of the nozzle cleaning rod. Equipped with a permanent magnet. Here, the driving means is a linear movement mechanism connected to a solenoid coil or a motor.

<Operation> When the nozzle cleaning rod is driven in the direction of the nozzle by the driving means, the nozzle cleaning rod is fixed and maintained at the nozzle position by the magnetic attraction force of the fixed permanent magnet acting on the base end of the nozzle cleaning rod. . On the other hand, when the nozzle cleaning rod is driven in the direction opposite to the nozzle by the driving means, the magnetic attraction force of the fixed permanent magnet acting on the base end of the nozzle cleaning rod causes
The nozzle cleaning rod is fixedly maintained in a position opposite to the nozzle.

<Embodiment> Hereinafter, a nozzle cleaning rod drive device according to the present invention will be described with reference to the drawings, taking a petroleum fan heater as an example. Fig. 1 is a cross-sectional view of the nozzle cleaning rod drive device, Fig. 2 is a block diagram showing the energizing circuit of the nozzle cleaning rod drive device, Fig. 3 is a circuit configuration diagram of the AC power control circuit, and Fig. 4 is a kerosene fan heater. FIG.

First, the nozzle cleaning rod drive device will be explained with reference to FIG. The nozzle cleaning rod drive device is also called a ratchet type drive device, and is used in the nozzle part (
(not shown), and moves the nozzle cleaning rod 10 between a nozzle position A and a counter-nozzle position B,
The structure is such that the valve opening/closing and cleaning of a nozzle (not shown) connected to a Bunsen type vaporizer are performed at the same time. Note that when the nozzle cleaning rod 10 is in the anti-nozzle position B, the petroleum gas generated in the vaporizer is ejected from the nozzle toward the burner side (the nozzle valve is open), while the nozzle cleaning rod 10 10 is at the nozzle position ilA, oil gas is cut off by the nozzle cleaning rod 10 (the nozzle valve is in a closed state).

Next, the internal configuration of the nozzle cleaning rod drive device will be described in detail.

The base end of the nozzle cleaning rod 10 is movably supported at the center of a housing body 20 fixed to the carburetor side, and the nozzle cleaning rod 10 is thereby moved alternately in the a direction and the b direction. It looks like this. Moreover, a driving part 11 made of a metal body is connected to the opposite nozzle side of the nozzle cleaning rod 10, and this driving part 11 has a driving coil 40 (corresponding to a driving means) provided inside the housing body 20. ,
The magnetic force of the fixing permanent magnet 50 acts on each of them. The drive coil 40 and the fixed permanent magnet 50 are both ring-shaped and housed inside the housing body 20, respectively. Furthermore, a spring member 30 is provided in the center of the housing body 20 to bias the drive portion 11 of the nozzle cleaning rod 10 in the b direction.

In other words, when the driving coil 40 is energized in the current direction shown by C in the figure (hereinafter referred to as positive current), the magnetic force of the driving coil 40 acts on the driving part 11 of the nozzle cleaning rod 10, and the fixed permanent magnet 50 and the urging force of the spring member 30, the nozzle cleaning rod 10 moves in the direction a. Thereafter, when the drive part 30 of the nozzle cleaning rod 10 contacts the base part 21 formed in the center of the housing body 20, the nozzle cleaning rod 10 is positioned at the nozzle position A. Furthermore, even if the drive coil 40 is de-energized in this state, the nozzle cleaning rod 10 will be fixed and maintained at the nozzle position A by the magnetic attraction force of the fixing permanent magnet 50. The reason why the fixing permanent magnet 50 is arranged on the side opposite to the nozzle of the housing body 20 is to prevent the magnetic properties of the fixing permanent magnet 50 from deteriorating due to heat conducted from the nozzle side.

Next, when the driving coil 40 is energized in the current direction indicated by d in the figure (hereinafter referred to as negative current), the magnetic force of the driving coil 40 is applied to the nozzle cleaning rod l along with the urging force of the spring member 30.
The nozzle cleaning rod 10 moves in the b direction by acting on the drive unit 11 of the nozzle cleaning rod 10. Thereafter, when the drive portion 11 of the nozzle cleaning rod 10 comes into contact with the cylindrical cover 22 fixed to the housing body 20, the nozzle cleaning rod 10 is positioned at the anti-nozzle position B. Further, even if the driving coil 40 is de-energized in this state, the nozzle cleaning rod 10 will be fixed and maintained at the opposite nozzle position A by the same magnetic attraction force of the fixing permanent magnet 50. Note that the base portion 21 is formed in a shape that can be brought into close contact with the drive portion 11, and is thus formed by the fixing permanent magnet 50, the cylindrical cover 22, the drive portion 11, the base portion 21, the housing body 20, etc. The magnetic resistance of the magnetic circuit is set low, and the nozzle cleaning rod 10 is stably maintained at the nozzle position A.

However, 60 in the figure is a valve for guiding the petroleum gas remaining inside the vaporizer to another exhaust route when extinguishing a fire, and is the opposite of the above-mentioned valve that is formed at the tip of the nozzle cleaning rod 10. You're going to make a move. In other words, the spring member 30 is provided mainly to ensure that the valve 60 is closed when the nozzle cleaning rod 10 is in the anti-nozzle position B, and the spring member 30 is provided at the intermediate position of the nozzle cleaning rod 10 as described above. The spring member 30 may be omitted in an oil fan heater that is not equipped with the valve 60 having the above function.

Next, the energizing circuit of the nozzle cleaning rod drive device configured as described above will be explained with reference to FIGS. 2 and 3.

As shown in FIG. 2, the control circuit 70 is a circuit mainly composed of a microcomputer, and is configured to control not only the nozzle cleaning rod drive device but also all the electrical components of the kerosene fan heater. .

In the figure, only the peripheral circuitry required to control the nozzle cleaning rod drive device is shown. That is, the input port of the control circuit 70 is connected to a power supply clock circuit 71 that detects the alternating timing of commercial AC.
An AC power control circuit 72 that energizes the drive coil 40 is connected to the output port 0. As shown in FIG. 3, the AC power control circuit 72 rectifies the AClooV commercial AC using a triac 721 and controls the direction of the current supplied to the drive coil 40. Further, a phototriac 722 that is driven by a signal generated by the control circuit 70 is connected to the gate of the triac 721 . In other words, the control circuit 70 operates the phototriac 722 and the triac 721 in synchronization with the commercial alternating current, thereby causing the drive coil 40 to operate.
It is designed to generate positive and negative currents that are supplied to the

Next, a flowchart of the operation program stored in advance in the control circuit 70 will be explained with reference to FIG. In addition, in the figure, the nozzle cleaning rod drive device is shown as a ratchet type drive device.

First, when the power outlet is turned on, power is supplied to the control circuit 70 and other main circuits. Thereafter, a positive current is applied to the drive coil 40 for about 3 seconds through the AC power control circuit 72 to drive the ratchet type drive device, and the nozzle cleaning rod 10
is stopped and held at nozzle position A, and the nozzle valve is maintained in the closed state (Sl).

Then, when the power switch is turned on (32), the ratchet type drive device is driven in exactly the same manner as in step 2, and the heater of the vaporizer is energized to heat the oil to a temperature at which it easily vaporizes (S3).

Thereafter, while controlling the temperature of the carburetor, the igniter and fuel supply pump are operated. At the same time, AC power control circuit 7
A negative current is applied to the drive coil 40 for about 3 seconds through 2 to drive the ratchet type drive device, thereby stopping and holding the nozzle cleaning rod 10 at the anti-nozzle position B and keeping the nozzle valve open. Then, the oil sent to the vaporizer by the fuel supply pump is converted into vaporized gas here, and the converted vaporized gas is ejected from the nozzle to the burner and ignited by the igniter. When the flame sensor provided in the burner detects ignition of the vaporized gas, the igniter is turned off and the vaporized gas is continuously combusted from then on (S4).

Thereafter, when the digestion SW is turned on (S5), temperature control of the carburetor is stopped and the fuel supply pump is turned off. At the same time, a positive current is applied to the drive coil 40 for about 3 seconds through the AC power control circuit 72 to drive the ratchet type drive device, stop and hold the nozzle cleaning rod 10 at the nozzle position A, and maintain the nozzle valve in the closed state. do. The operation of the device is now stopped (S6).

In the oil fan heater mentioned above, the nozzle cleaning rod 1
0 to the nozzle position A or anti-nozzle position B and maintain this position, the energization period of the drive coil 40 can be extremely shortened.
The structure of the nozzle cleaning rod can be made extremely simple, and the nozzle cleaning rod driving device can be made small, lightweight, and inexpensive.

Moreover, with the trend towards miniaturization of kerosene fan heaters, even if the distance between the nozzle cleaning rod drive device and other equipment constituting the kerosene fan heater is close, the drive coil 4
Since the zero energization period can be made very short, the undulations and abnormal vibrations that occur when the drive coil 40 is energized are virtually no problem.

Therefore, it is of great significance in producing and developing a small, high-performance kerosene fan heater at low cost.

The nozzle cleaning rod drive device according to the present invention can be applied not only to oil fan heaters but also to all types of combustors, and the nozzle cleaning rod driving device may be used as a driving means to move the nozzle cleaning rod using a linear drive mechanism. It may take any form.

<Effects of the Invention> As described above, in the case of the present nozzle cleaning rod driving device, the nozzle cleaning rod driven by the driving means to the nozzle position or the anti-nozzle position is attracted by the fixing permanent magnet. Therefore, the nozzle cleaning rod can be reliably fixed and maintained at the nozzle position and the anti-nozzle position without any external action. Therefore, it is of great significance in reducing the size and cost of the device.

[Brief explanation of the drawing]

1 to 4 are diagrams for explaining an embodiment of the nozzle cleaning rod drive device according to the present invention, in which FIG. 1 is a sectional view of the nozzle cleaning rod drive device, and FIG. 2 is a nozzle cleaning rod drive device. FIG. 3 is a block diagram showing the energizing circuit of the cleaning rod drive device, FIG. 3 is a circuit configuration diagram of the AC power control circuit, and FIG. 4 is a flowchart showing the operating program of the kerosene fan heater. 5 and 6 are diagrams for explaining a conventional nozzle cleaning rod drive device, and FIG. 5 is a diagram corresponding to FIG. 1,
FIG. 6 is a diagram corresponding to FIG. 3. 10... Nozzle cleaning rod 20, 40, 50, A, B, Housing main body drive coil (drive means) Fixed permanent magnet nozzle position Opposite nozzle position

Claims (1)

[Claims] (1) A housing body that is fixed to the nozzle portion of the combustor and movably supports a nozzle cleaning rod between a nozzle position and an anti-nozzle position, and a housing body that is provided on the housing body and supports the nozzle cleaning rod in the nozzle position direction A nozzle for a combustor, characterized in that it is equipped with a drive means for moving the nozzle alternately in a direction opposite to the nozzle position, and a fixing permanent magnet that is provided on the housing body and that attracts the base end of the nozzle cleaning rod. Cleaning rod drive device.