摘要:
A discharge tube in which the electrical insulating property between the discharge trigger wires (30) is not deteriorated by substance sputtered when discharge is conducted between upper (20a) and the lower (20b) discharge electrodes includes sub-discharge trigger wires (50) at the centre of an inner circumferential wall of the airtight cylinder (10). The sub-discharge trigger wires (50) are electrically insulated from the upper and the lower discharge electrodes (20a,20b). Discharge trigger wires (30a,30b) connected with the upper and lower discharge electrode (20a,20b) respectively are formed in the upper and the lower portions of the inner circumferential wall of the airtight cylinder (10) at which there is no possibility of adhesion of the sputtering substance (40) generated at the process of discharge. A distance between the discharge trigger wires (30a,30b) is electrically reduced via the sub-discharge trigger wires (50). An initial discharge is stably generated at an early stage between the end portions of the discharge trigger wires (30a,30b) and the end portions of the sub-discharge trigger wires (50) located close to the discharge trigger wires (30a,30b).
摘要:
A switch has a gas discharge chamber in which two electrodes, namely a cathode (11) and an anode (12), are arranged at a distance (d) apart and are separated from each other by an electrically insulating wall (9a) of ceramic material or glass. The cathode (1) has a hole (5) and the electrodes (11, 12) are connected to the insulating wall (9a) through a dense metal-ceramic compound or fused material. The gas discharge chamber contains an ionizing low pressure gas under a pressure p such that ignition of a gas discharge occurs between the electrodes (11, 12) at a voltage on the left, descending branch of the Paschen curve. For at least one of the two electrodes (11, 12), the connecting lines (4) at which the respective electrodes (11, 12), the gas and the wall (9a) meet, are located at a minimal distance from the opposite electrode (12, 11) greater than (d), provided that the corresponding electrode (11, 12) is separated from the wall (9a) by a gap (3) whose width is less than (d).
摘要:
An electrical discharge tube comprises a cylindrical body (10), made of insulating material, having an inner surface, and having end faces defining respective openings. Metallized layers (40) are formed on the respective end faces of the cylindrical body (10) and are substantially parallel to each other. Electrodes (26,28) airtightly close the respective openings by means of the metallized layers (40) and have respective electrical discharge faces (23,25), between which an electrical discharge gap is defined. At least one first electrical discharge trigger wire (50) is formed as a loop on the inner surface of the cylindrical body (10) and extends substantially parallel to the metallized layers (40) along a first surface (31) located within the range of the electrical discharge gap. At least one second electrical discharge trigger wire (60) is formed on the inner surface of the cylindrical body (10) and extends from the upper metallized layer (40) to a fourth surface (37) located between a second surface (33) including the electrical discharge face (23) of the upper electrode (26) and the upper metallized layer (40).
摘要:
A device suitable for switching large currents includes, within a gas filled envelope, an anode (1), electrodes (2 and 3) and a thermionic cathode (4). Initially, the device holds off a voltage until a triggering pulse is applied to electrode (3). This causes an electron current to be established between the thermionic cathode (4) and anode (1). When the current reaches a sufficiently large value, further conduction through the device occurs via current drawn from the surface of the electrode (2) in cold cathode mode, bypassing the cathode (4).
摘要:
The invention relates to a gas discharge tube (30) of a type that may be used for example in gas turbine engine (10) ignition systems. The gas discharge tube (30) has an envelope (42) containing a gas therein and the envelope has a pair of spaced electrodes (38, 40) for application of an electric potential difference across the gas. An electromagnetic radiation source (44), such as a deep UV light source, is arranged to emit photons (50) into the envelope (42) so as to initiate ionisation of the gas, thereby reducing the potential difference required to cause electrical conductance between the electrodes. The electromagnetic radiation source, which may comprise light emitting diodes, may be selectively controlled.
摘要:
A discharge tube in which the electrical insulating property between the discharge trigger wires (30) is not deteriorated by substance sputtered when discharge is conducted between upper (20a) and the lower (20b) discharge electrodes includes sub-discharge trigger wires (50) at the centre of an inner circumferential wall of the airtight cylinder (10). The sub-discharge trigger wires (50) are electrically insulated from the upper and the lower discharge electrodes (20a,20b). Discharge trigger wires (30a,30b) connected with the upper and lower discharge electrode (20a,20b) respectively are formed in the upper and the lower portions of the inner circumferential wall of the airtight cylinder (10) at which there is no possibility of adhesion of the sputtering substance (40) generated at the process of discharge. A distance between the discharge trigger wires (30a,30b) is electrically reduced via the sub-discharge trigger wires (50). An initial discharge is stably generated at an early stage between the end portions of the discharge trigger wires (30a,30b) and the end portions of the sub-discharge trigger wires (50) located close to the discharge trigger wires (30a,30b).
摘要:
A discharge tube (1A,1B,1C) is disclosed that includes: a tube (10A,10B,10C) having first and second end surfaces each including a metallized surface (40), first and second discharge electrodes (22,24) joined to the respective metallized surfaces (40) and multiple trigger lines (60,80) formed on the inner wall surface of the tube (10A,10B,10C) to extend along the axial directions of the tube (10A,10B,10C). The first and second discharge electrodes (22,24) are joined to the metallized surfaces (40) so that a discharge gap (29) is formed between the first and second discharge electrodes (22,24) and the tube (10A,10B,10C) is hermetically sealed. The trigger lines (60,80) include one or more first trigger lines (60) connected to the metallized surfaces (40) and multiple second trigger lines (80) isolated from the metallized surfaces (40). The second trigger lines (80) are formed at equal intervals on the inner wall surface of the tube (10A,10B,10C) and each first trigger line (60) is formed between a pair of the second trigger lines (80).
摘要:
An electrical discharge tube comprises a cylindrical body (10), made of insulating material, having an inner surface, and having end faces defining respective openings. Metallized layers (40) are formed on the respective end faces of the cylindrical body (10) and are substantially parallel to each other. Electrodes (26,28) airtightly close the respective openings by means of the metallized layers (40) and have respective electrical discharge faces (23,25), between which an electrical discharge gap is defined. At least one first electrical discharge trigger wire (50) is formed as a loop on the inner surface of the cylindrical body (10) and extends substantially parallel to the metallized layers (40) along a first surface (31) located within the range of the electrical discharge gap. At least one second electrical discharge trigger wire (60) is formed on the inner surface of the cylindrical body (10) and extends from the upper metallized layer (40) to a fourth surface (37) located between a second surface (33) including the electrical discharge face (23) of the upper electrode (26) and the upper metallized layer (40).
摘要:
A device suitable for switching large currents includes, within a gas filled envelope, an anode (1), electrodes (2 and 3) and a thermionic cathode (4). Initially, the device holds off a voltage until a triggering pulse is applied to electrode (3). This causes an electron current to be established between the thermionic cathode (4) and anode (1). When the current reaches a sufficiently large value, further conduction through the device occurs via current drawn from the surface of the electrode (2) in cold cathode mode, bypassing the cathode (4).