JPS6149570B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a movable piezoelectric body for automatically igniting a gas burner used for cutting, welding, etc. of metal, and its purpose is to prevent thermal effects on the piezoelectric element, It is an object of the present invention to provide a movable piezoelectric body that can generate a high voltage in a piezoelectric element by having a strong impact force on a receiving abutment of an inner nozzle even at a minute gas pressure, and can instantaneously and reliably ignite a gas burner. That is.

For this purpose, the present invention provides a method for moving axially within the cavity of the inner cylinder by the supply pressure of high-pressure oxygen gas.
It collides with the receiving protrusion of the conductive tube provided on the inner nozzle that spouts high-pressure oxygen gas, which is electrically insulated and coaxially connected to the inner tube, generating one electrode at the tip of the inner nozzle. , the other electrode is generated at the tip of the outer nozzle that spouts the mixed gas, which is fitted around the inner cylinder and the outer periphery of the inner nozzle, and the discharge is ignited between the tips of these inner and outer nozzles. , a small diameter part having an outer diameter approximately equal to the inner diameter of the small diameter part of the cavity in the inner cylinder, and a plurality of small diameter parts integrally connected to this small diameter part via an outer circumferential recess and communicated with the recess at equal intervals in the axial direction. A high-pressure oxygen gas passage hole from the inner cylinder is installed through the
and a main body having a large diameter part whose outer diameter is approximately equal to the inner diameter of the large diameter part of the cavity in the inner cylinder, and which is integrally inserted into the central cavity of the large diameter part of this main body via an insulator. A cylindrical piezoelectric element is integrally fixed in contact with the anode side of the piezoelectric element, and its thin cylindrical tip protrudes from the end face of the large diameter part, and when activated, the receiving projection of the conductive tube A stopper that collides with the inner nozzle to generate one electrode at the tip of the inner nozzle is screwed into the screw hole of the small diameter part, and the protrusion on one side is integrally pressed against the cathode side of the piezoelectric element. and a receiver that generates the other electrode at the tip of the outer nozzle during operation, and a receiver that is integrally fitted and fixed in a recess of the receiver so that its end surface is flush with the end surface of the receiver, The device is characterized by a structure including a permanent magnet that attracts the end face of the small diameter portion of the cavity in the inner cylinder and closes the high pressure oxygen gas flow path when the inner cylinder is not in operation.

Hereinafter, the present invention will be explained based on illustrated embodiments.

1a, 1b and 1c are a sectional view and a side view of an example of a movable piezoelectric body according to the present invention, 2nd a and 2b are a vertical sectional view and a side view of the main body, and 3rd a, b is a vertical cross-sectional view of the receiver fitted with a permanent magnet, Figures 4 and 5;
The figure is a longitudinal sectional view showing the state in which the gas burner is used for ignition.

As shown in FIGS. 4 and 5, the movable piezoelectric body according to the present invention has a large diameter portion 106 and a small diameter portion 1 in an inner cylinder 103 having a high pressure oxygen gas flow path 104.
07, is movable in the axial direction within the device 105 by the supply pressure of high-pressure oxygen gas, and is electrically insulated and coaxially connected via the inner cylinder 103 and the insulator 108. It collides with the receiving protrusion 111 of the conductive tube 110 provided in the inner nozzle 109 that spouts high-pressure oxygen gas, generating one electrode (+) at the tip 112 of the inner nozzle 109, and A mixed gas flow path 113 is formed coaxially with the cylindrical body 100 having a high pressure oxygen gas introduction hole 101 and a mixed gas introduction hole 102 provided on the outer periphery of the cylinder 103 and connected thereto, and between it and the inner nozzle 109. The outer nozzle 11 connected with
The other electrode (-) of the tip 115 of the inner and outer nozzles 109 and 114 is generated to cause a discharge between the tips 112 and 115 of the inner and outer nozzles 109 and 114 to ignite the mixed gas from the outer nozzle 114, It consists of a main body, an insulator, a piezoelectric element, a stopper, a receiver, and a permanent magnet.

The metal main body 1 is connected to a hollow space 105 in an inner cylinder 103 on one side via an outer circumferential recess 2 located approximately in the middle.
has a large diameter portion 3 having an outer diameter approximately equal to the inner diameter of the large diameter portion 106, and has an inner cylinder 103 on the other side.
It integrally has a small diameter part 4 having an outer diameter approximately equal to the inner diameter of the hollow small diameter part 107, and the recess 2 of the large diameter part 3.
Four high-pressure oxygen gas flow holes 5 from the inner cylinder 103 are penetrated at equal intervals in the axial direction of the outer peripheral edge communicating with the
Further, an opening 6 is provided at the center of the front end of the large diameter section 3, and a piezoelectric element storage space having a slightly large diameter communicates with the opening 6 in the axial direction from the large diameter section 3 to a part of the small diameter section 4. A hole 7 is provided in the small diameter portion 4, and a screw hole 8 having a slightly larger diameter than this is provided in the small diameter portion 4 and communicating with the space 7.

In the cavity 7 of the main body 1, there is a cavity 7 and an opening 6.
A cylindrical piezoelectric element 1 with a cathode (-) formed at its rear end and an anode (+) formed at its front end via an insulator 9 made of ceramic or the like having a shape compatible with the inner shape of the piezoelectric element 1.
3 is integrally inserted, and this piezoelectric element 1
An inverted T-shaped dowel 11 is integrally joined to the anode side of No. 3, and its thin cylindrical tip 12 protrudes slightly outward from the insulator opening 10 and is fixed.
During operation, which will be described later, the tip 12 of this stopper 11 collides with the receiving protrusion 111 of the conductive cylinder 110, causing one electrode (+) to be attached to the tip 112 of the inner nozzle 109.
The piezoelectric element 1
On the cathode side of No. 3, a permanent magnet 16 is fitted and fixed in the rear end recess in the same end surface shape. A protrusion 15 having an outer diameter approximately the same as the inner diameter of the insulator 9 is integrally provided on the insulator 9.
is provided in pressure contact with the cathode side end surface of the piezoelectric element 13 from the opening thereof, and this holder 14 allows the tip portion 115 of the outer nozzle 114 to be pressed during operation, which will be described later.
and generates the other electrode (-), and when inactive, the high pressure oxygen gas flow path 104 is closed by adsorption to the end face of the small diameter portion 107 of the inner cylinder cavity 105 of the permanent magnet 16. It's summery.

The movable piezoelectric body according to the present invention has the above structure, and its operation is as shown in FIGS. 4 and 5.

That is, in the state shown in FIG.
00 is attached to the installation port of the gas burner, and the valve is opened to supply a mixed gas, the gas flows through the flow path 113 from the mixed gas introduction hole 102 to the outer nozzle 114.
erupts from. Subsequently, when high pressure oxygen gas is supplied, it passes through the high pressure oxygen gas introduction hole 101 and enters the inner cylinder 103.
Pressure is applied from the high-pressure oxygen gas flow path 104 to the end faces of the holder 14 and the permanent magnet 16 of the movable piezoelectric body.

The high-pressure oxygen gas flow path 104 is a hollow small diameter portion 107
An attractive force is generated between the end face of the permanent magnet 16 and the permanent magnet 16 and the gas flow path 104 is sealed, so that the gas pressure within the gas flow path 104 is increased, and the gas pressure causes the permanent magnet 16 to attract the permanent magnet 16. When the force exceeds the force, the pressurized gas is released and the movable piezoelectric body instantly moves into the space 10.
5, and as shown in FIG.
At the same time as the movable piezoelectric member collides, high pressure oxygen gas flows from the cavity 105 through the high pressure oxygen gas flow hole 5 of the movable piezoelectric body and is ejected from the inner nozzle 109.

Also, at almost the same time, the piezoelectric element 13 is damaged due to the impact received from the metal 11 that collided with the receiving abutment 111.
A high voltage is generated between the tip 112 of the inner nozzle 109 which is electrically connected to the anode (+) of the piezoelectric element 13 and the outer nozzle 114 which is electrically connected to the cathode (-) of the piezoelectric element 13. Tip part 11 of
5, and the mixed gas from the outer nozzle 114 is ignited by the discharge.

Furthermore, when the valve of the gas burner is closed, the supply pressure of high-pressure oxygen gas that presses the movable piezoelectric body is eliminated, so that the movable piezoelectric body opens the cavity of the inner cylinder 103 by the suction action of the permanent magnet 16. It adsorbs to the end face and closes the high-pressure oxygen gas flow path 104, returning to the original state shown in FIG.

As described above, the movable piezoelectric body according to the present invention is used for automatic ignition of a gas burner, and the piezoelectric element 13 is clamped in the main body 1 by the stopper 11 and the protrusion 15 of the receiver 14 screwed into the main body 1. The magnet is subjected to a compressive force, and is also subjected to an instantaneous strong impact force due to the release of pressurized gas, which is greater than its own weight and the attraction force of the permanent magnet 16, so due to the synergistic effect of these Even when the gas pressure is minute, a high voltage is generated in the piezoelectric element 13, and discharge ignition can be performed reliably.

Furthermore, since the piezoelectric element 13 is completely housed within the main body 1, even if the ambient temperature within the cavity 105 of the inner tube 103 increases, there is almost no thermal effect on the piezoelectric element 13.

In addition, this movable piezoelectric body has a valve action, so that even if flashback occurs during use of the gas burner, it will be absorbed by the permanent magnet 16 to prevent the flashback from occurring in the high-pressure oxygen gas flow path 1.
04, the gas burner can be used extremely safely.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention.
Figure a and Figures 1 b and c are the overall longitudinal sectional view and side view,
Figures 2a and 2b are a longitudinal sectional view and a side view of the main body,
Figures 3a and 3b are a longitudinal sectional view and a side view of the receiver into which a permanent magnet is fitted, and Figures 4 and 5 are longitudinal sectional views showing how it is used for igniting a gas burner. FIG. 4 shows the state before operation, and FIG. 5 shows the state after operation. DESCRIPTION OF SYMBOLS 1...Main body, 2...Outer circumference recess, 3...Large diameter part, 4...Small diameter part, 5...High pressure oxygen gas flow hole, 7...Vacancy, 8...
Screw hole, 9... insulator, 11... dowel, 12... dowel tip, 13... piezoelectric element, 14... receiver, 15... receiver protrusion, 16... permanent magnet, 17... screw portion, 100
...Cylinder body, 103...Inner cylinder, 104...High pressure oxygen gas flow path, 105...Vacancy, 106...Large diameter portion, 107...
Small diameter portion, 108... Insulator, 109... Inner nozzle, 110... Conductive tube, 111... Receptacle, 112...
Inner nozzle tip, 113...Mixed gas flow path, 11
4...Outer nozzle, 115...Outer nozzle tip.

Claims (1)

[Claims] 1 A conductive conductor provided in an inner nozzle that spouts high-pressure oxygen gas and is electrically insulated and coaxially connected to the inner cylinder by being moved in the axial direction within the cavity of the inner cylinder by the supply pressure of high-pressure oxygen gas. It collides with the receiving protrusion of the cylinder to generate one electrode at the tip of the inner nozzle, and the other electrode is generated at the tip of the outer nozzle that spouts out the mixed gas fitted around the inner tube and the outer periphery of the inner nozzle. The device is for generating an electrode and igniting a discharge between the tips of the inner and outer nozzles, and includes a small diameter portion having an outer diameter approximately equal to the inner diameter of the small diameter portion of the cavity in the inner cylinder, and an outer circumferential recess. The small diameter portion is integrally connected to the small diameter portion through the
A large diameter hole in which a plurality of high-pressure oxygen gas passage holes from the inner cylinder are installed at equal intervals in the axial direction and communicated with the recessed part, and the outer diameter of the holes is approximately equal to the inner diameter of the large diameter portion of the cavity in the inner cylinder. a cylindrical piezoelectric element integrally inserted into the central cavity of the large diameter part of the main body through an insulator; and a cylindrical piezoelectric element integrally fixed in contact with the anode side of the piezoelectric element. a stopper whose thin cylindrical tip protrudes from the end surface of the large diameter portion and which collides with the receiving protrusion of the conductive tube during operation to generate one electrode at the inner nozzle tip; A receiver that is screwed into the screw hole of the small diameter part, has a protruding part on one side integrally pressed against the cathode side of the piezoelectric element, and generates the other electrode at the tip of the outer nozzle when activated. The gold plate is integrally fitted and fixed in the recess of this receiver so that its end face is flush with the end face of the receiver, and when it is not in operation, it is attracted to the end face of the small diameter portion of the hollow space in the inner cylinder. A movable piezoelectric body for automatic ignition of a gas burner, which is equipped with a permanent magnet that blocks the flow rate of high-pressure oxygen gas.