Spray ionization device
A spray ionization device comprising: a first tube that has a first flow path through which a liquid can flow and a first outlet on one end thereof from which the liquid is sprayed; a second tube that surrounds the first tube with a gap therebetween, has a second flow path through which a gas can flow, and has a second outlet on the one end thereof; and an electrode that extends through the interior of the first flow path of the first tube, from the other end thereof to the one end, said electrode being arranged such that the tip thereof is at the same position as the first outlet or is further on the other end side than the first outlet, and said electrode being able to apply a voltage to the liquid by means of a power source connected to the electrode.
1 . A spray ionization device, comprising:
a first tube including a first channel through which a liquid can flow, the first tube including a first outlet for ejecting the liquid at one end;
a second tube surrounding the first tube with a gap and including a second channel through which a gas can flow, the second tube including a second outlet at the one end, the second channel being defined by an outer circumferential surface of the first tube and an inner circumferential surface of the second tube; and
an electrode which extends within the first channel of the first tube from an opposite end to the first end, and is arranged so that a leading end is the same position as the first outlet or further toward the opposite end than the first outlet, the electrode being capable of applying voltage to the liquid by way of a power source connected to the electrode, wherein
the second channel includes a constriction portion, and a channel area of the second channel progressively decreases from the opposite end to the constriction portion,
at the one end, the second outlet is arranged further downstream than the first outlet, at least a portion of the inner circumferential surface of the second tube has a diameter that progressively decreases toward the second outlet, and a diameter of the inner circumferential surface of the second outlet is equal to or greater than an opening diameter of the first outlet, and
electrically charged droplets of the liquid can be ejected from the second outlet,
the spray ionization device, further comprising: a third tube between the first tube and the second tube, the third tube surrounding the first tube and including a third outlet at the one end, wherein
the second channel through which the gas can flow is defined by an outer circumferential surface of the third tube and the inner circumferential surface of the second tube,
at the one end, a tip of the third tube is arranged further toward the opposite end than the first outlet, and
at a tip at the one end of the third tube, a gap between an inner circumferential surface of the third tube and the outer circumferential surface of the first tube is blocked.
2 . The spray ionization device according to claim 1 , wherein the first outlet of the first tube has an opening diameter smaller than the diameter of the inner circumferential surface of the second tube in the constriction portion.
3 . The spray ionization device according to claim 1 , wherein the third tube includes an other constriction portion formed by a tip of the outer circumferential surface at the one end of the third tube and the inner circumferential surface of the second tube.
4 . The spray ionization device according to claim 3 , wherein the second tube is formed such that at least the portion of the inner circumferential surface of the second tube has the diameter that progressively decreases from a portion of the other constriction portion toward the second outlet.
5 . The spray ionization device according to claim 1 , wherein, at a tip at the one end of the third tube, a dielectric material fills a gap between an inner circumferential surface of the third tube and the outer circumferential surface of the first tube.
6 . The spray ionization device according to claim 1 , further comprising: a source of the gas; and
a heating unit for heating the gas between the source and a supply port provided at an opposite end of the first tube.
7 . The spray ionization device according to claim 1 , further comprising:
a high-voltage power source connected to the electrode, wherein
the high-voltage power source applies voltage in a range of 0.5 kV to 10 kV to the electrode.
8 . The spray ionization device according to claim 1 , further comprising: a fourth tube surrounding the second tube with a gap and including a third channel through which a second gas can flow, the fourth tube including a fourth outlet at the one end, the third channel being defined by the outer circumferential surface of the second tube and an inner circumferential surface of the fourth tube.
9 . The spray ionization device according to claim 8 , wherein, at the one end, the fourth outlet is arranged further toward the tip than the second outlet, and an inner circumferential surface of the fourth tube has a diameter that at least progressively decreases toward the fourth outlet.
10 . The spray ionization device according to claim 8 , further comprising: a second heating unit for heating the second gas or electrically charged droplets of the liquid ejected from the second outlet together with the second gas enveloping the electrically charged droplets of the liquid.
11 . The spray ionization device according to claim 1 , wherein the spray ionization device is used in surface coating.
12 . The spray ionization device according to claim 1 , wherein the spray ionization device is used for space processing utilizing sterilization, deodorization, dust collection, and chemical reactions, by gas-phase or spatial chemical reactions by spraying of the electrically charged droplets.
13 . The spray ionization device according to claim 1 , wherein the spray ionization device is for an analysis device.