JPS62287151A - High voltage pulse generating device - Google Patents

Abstract

PURPOSE:To secure a stable pulse current by converting a pulse generated by a pulse generating circuit into a high voltage pulse and triggering three spark gap disks connected in series and supplying the generated high-voltage pulse current to a transducer coil. CONSTITUTION:The DC high voltage of a high voltage power source 1 is passed through a resistor 2 to charge a storage battery 3. The pulse generated by the pulse generating circuit 4 is converted by a pulse transformer 5 into the high-voltage pulse. The high-voltage pulse is applied to spark gap disks 8a and 8b through a resistor 14 and disks 8a and 8b are triggered and discharged. Then, the high voltage applied from the side of the storage battery 3 causes the gap disks 6, 7, and 8 to spark, and the high-voltage pulse current is conducted to the transducer coil 15. Thus, the high-voltage pulse current is secured by the sparking having no error.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Industrial Application Field] This invention applies a high-voltage pulse electric shock to a sensor such as an electromagnetic ultrasonic coil and transmits ultrasonic waves to a specimen to be examined. This invention relates to an ultrasonic inspection device that inspects the quality of metal products through destruction.

[Conventional technology]

FIG. 3 shows a conceptual diagram of a conventional device related to a high-pressure pulse generator of an electromagnetic ultrasonic inspection device.

In Figure 3, (1) is a high-voltage DC power supply that supplies high-voltage DC power, and (2) is 751 that determines the current and time when charging the high-voltage DC power of the high-voltage DC power supply (1) to a condenser.
resistance5. +3+ is a capacitor that stores the power of the high voltage DC power supply (1) via the first resistor (2);
The second resistors a and aS, which determine the value of the high-voltage pulse current obtained when the DC power stored in the first capacitor is sparked from the discharge rod to the receiving rod, are connected in series with the second resistor 1. A transducer coil Q[9 is made of a magnetic material such as iron, and is a source of generation of electromagnetic ultrasonic waves excited by the high-voltage pulse current flowing through the second resistor αG, and the transducer coil α The material to be inspected αe is inspected by electromagnetic ultrasonic waves generated by interaction with the electromagnetic force in step 4.

αη is connected to the capacitor (3), rii
A discharge rod for discharging the DC power stored in the i storage capacitor (3) from the conical tip, α & is the discharge rod (17+
The power receiving rod 1 port 9, which is located opposite to the rotating disk and sends a high voltage pulse current through which the discharge rod αη sparks through the space of the small hole in the rotating disk, has a gear on the outer periphery and the discharge rod 0D and the power receiving rod (1). A rotating disk made of an insulator with a small hole at one point in the same position, ■ is a bearing that supports the above rotating disk aii, CI'll is a rotating disk that supports the rotation of the motor [+9 gears] The gear that reaches 1, the prisoner is the gear Cυ
This is a motor that rotates at a constant speed.

The DC power of high voltage DC power # (1) is 1 with a time constant consisting of the product of the resistance value of the first resistor (2) and the capacitance value of the capacitor (3).
11. Charge the storage battery. The DC power stored in the capacitor (3) is rotated by the motor through the gear CI.A small hole provided in the rotating disk Q9 passes through the position of the discharge rod connected to the capacitor (3). When it passes, it sparks the space and generates a high-voltage pulse current to the power receiving rods located opposite each other, which connects the second resistor OrJ in series.
and flows through the transducer coil 09.

The high-voltage pulse current flowing through the transducer coil (+9) is converted into electromagnetic force by the transducer coil, and the electromagnetic force induces electromagnetic force in the material to be examined (lilil), and the interaction of the electromagnetic forces generates electromagnetic ultrasound.

Therefore, if the mj rotary disk (19) is continuously rotated at a constant speed by a motor, electromagnetic ultrasonic waves (repeatedly generated)
The quality of metal products, etc. has been non-destructively inspected by capturing the echoes reflected from the discontinuous portion of Q with a transducer coil (151).

[Problem that the invention seeks to solve]

In the conventional device, the DC power stored in the capacitor L3+ is guided to the discharge rod qη, and a spark is generated between the discharge rod αD and the power receiving pole 1 through a small hole in the rotating rotating disk 09 to cause a high voltage pulse current to flow. When the rotation speed of the rotating disk (13) is increased, the time for the small hole in the rotating disk α9 to pass between the facing discharge rod [+? There were many cases where it did not flow (there was a problem that it lacked coordination.

In order to solve these conventional problems, this invention
The purpose is to be able to secure a stable high-voltage pulse current.

[Means for solving problems]

The high-pressure pulse generator according to the present invention consists of three sets of spark gap discs, a first, a second, and a third, each consisting of two ring discs of the same shape facing each other in parallel with a gap of several degrees. connection, and third, fourth, and fifth resistors (
Connect the disk on one side of the first spark gap disk to the capacitor (here).

A disk on one side of the third spark gap disk is connected to the transducer coil via a second resistor, a pulse generation circuit that triggers the spark, and a trigger pulse signal of the pulse generation circuit boosted to a high voltage. It is equipped with a pulse transformer.

[For production]

High-voltage DC current: The original DC voltage is charged to a storage battery through a first resistor, and the high voltage of the +m storage battery is applied to the first, second, and third spark gap discs, respectively. The voltage is divided and applied in accordance with the values of the third, fourth, and fifth resistors connected in parallel. In the above state, the pulse generation circuit generates a -1f Hals that triggers a spark, and the pulse transformer converts it into a high voltage pulse, and at the moment the high voltage pulse is applied to the third spark gap disk, the third spark gap is generated. As the disks undergo a trigger discharge, the high voltage applied from the capacitor side impulsively sparks each of the first, second and third spark gap disks, causing a high voltage pulse current to flow through the transducer coil. By repeatedly generating pulses using the pulse generating circuit described above, it is possible to flow a continuous high voltage pulse current.

[Actual case]

FIG. 1 is a main configuration diagram of a high-pressure pulse generator showing a practical example of the present invention, and FIG. 2 is a conceptual diagram showing the implementation of the spark gap disk of the present invention.

In Figures 1 and 2, (4) is a pulse generation circuit that repeatedly generates a pulse that triggers a spark, and (5)
(6) is a pulse transformer that faithfully boosts the pulses generated by the pulse generation circuit to obtain high-voltage pulses, and (6) is a transformer in which two ring disks of the same shape are opposed in parallel with a gap between them. (6a) is the first spark gap disc connected to the electricity storage company (3), and (7) is the same as the first spark gap disc (6).
) is a second spark gap disc connected to (6b) of the first spark gap disc, and (8) is the second spark gap disc connected to (6b) of the first spark gap disc.
(8a) is the same as the spark gap disc (7) in
A third spark gap disc (9) is connected to the second spark gap disc (7b);
and the second and third spark gaps f61. A sword, (8)
An insulating holder that maintains parallel lines with a gap of several mm and insulates against high voltage.

αυ is a third resistor with a high resistance value connected in parallel to the first spark gap disk (6), and G2 is a second resistor of +jjr.
A fourth resistor with a high resistance value is connected in parallel to the spark gap disc (7) of 3. G31 is a fifth resistor with a high resistance value connected in parallel to the third spark gap disk (8).
? , “A, α·υ is a sixth resistor with a high resistance value that applies the high voltage pulse of the pulse transformer (5) to the third spark gap disc (8).

The high DC voltage of the high voltage DC power supply (1) charges the capacitor (3) via the first resistor (2). 1] 11th capacitor (3
) The high pressure stored in the first spark gap disc (6
), a third resistor Uυ connected in parallel with the second spark gap disk (7), a fourth resistor 5az connected in parallel with the second spark gap disk (7), and a fifth resistor Uυ connected in parallel with the third spark gap disk (8). The first, second, and third spark gap discs [G1. (Because the gap between 71 and +81 is large, it is impossible to spark, and the third resistor αυ, fourth resistor 5az, and fifth resistor 2i; (+31
The voltage becomes 7:51 and the second voltage is determined by the resistance value ratio of each
and third spark gap disk +61. [71,+8
Apply 1.

Since the second resistor 3 (101) has a small resistance value, it can be ignored as the above-mentioned element.

Under the above conditions, the pulses generated by the pulse generating circuit (4) are converted into high voltage pulses by the pulse transformer (51).The high voltage pulses are passed through the sixth resistor lu to the third spark gap disk (8). The moment the third spark gap disc (8) is applied, the high voltage pulse causes a trigger discharge.Then, the high voltage applied from the L31 side shocks the first, second and third sparks. The spark gap disc +61.[71, +81 is sparked and a high voltage pulse current flows through the transducer coil 051.Continuous high voltage pulses are generated by continuously generating pulses from the pulse generating circuit (4). It is possible to send the current to the transducer coil α9.

〔Effect of the invention〕

As described above, this invention can solve the problem of unstable sparking when speeding up the conventional device by using an electronic circuit system instead of the mechanical operation method of the conventional device, resulting in stable sparking without mistakes. The present invention provides a device for passing a high-voltage pulsed current.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the main configuration of a high-pressure pulse generator showing an example of this invention, Fig. 2 is a conceptual diagram showing the implementation of the spark gap disk of this invention, and Fig. 3 is a conventional high-pressure pulse generator. FIG. 2 is a conceptual diagram of the device. In the figure, (1) is a high voltage DC power supply, (2) is a first resistor 73. Is +31 a storage battery? , Lta is a pulse generation circuit, (
51 is a pulse transformer, and (6) is a first spark gap disc. The leapfrog is the second spark gap disc, (8) is the third spark gap disc, (9) is the insulating holder, and Ill is the second resistor 23. uυ is the third resistor, +33 is the fourth resistor. +131 C fifth resistor t”h, G41 it sixth resistor, 051f;!Transducer coil, 061
is the test material and αD is the discharge rod. The q role is the power receiving rod, u1 is the rotating disk, ■ is the bearing, (
211 is a gear, and 211 is a motor.

Claims (1)

[Claims] A high-voltage pulse generation device that charges a condenser with a DC high voltage from a high-voltage DC power source via a first resistor and, after charging is completed, instantly discharges the charged high voltage of the condenser to generate a high-voltage pulse, A pulse generation circuit that generates a trigger pulse that instantly discharges the charging high voltage of the capacitor, a pulse transformer that faithfully boosts the pulse voltage of the pulse generation circuit, and a ring disk of the same shape that is connected to the capacitor. a first spark gap disc made of two spark gap discs facing each other in parallel with a gap of several mm;
a second spark gap disk connected in series with the spark gap disk; a third spark gap disk connected in series with the second spark gap disk; and a third spark gap disk connected in series with the third spark gap disk. a second resistor connected to each other, and a third resistor, a fourth resistor, and a fifth resistor connected in parallel to each of the first, second, and third spark gap discs.
A high-voltage pulse generator comprising: a resistor; and a sixth resistor for applying the high-voltage pulse of the pulse transformer to the third spark gap disk.