ESI sprayer and ionizer

1. An ESI sprayer configured to be used by being attached to a first hole made in a housing of an ionizer and a second hole made at an end of the first hole, and the second hole having an inner diameter smaller than an inner diameter of the first hole, the second hole having an end communicating with an ionization chamber, the ESI sprayer comprising:

a) a first pipe having an outer diameter smaller than an inner diameter of the first hole;

b) a second pipe having an outer diameter smaller than an inner diameter of the second hole;

c) a pipe connecting jig made of a conductive material and connecting end faces of the first pipe and the second pipe separated from each other; and

d) a pipe protecting member configured to be an extendable tube made of a conductive material and having an outer diameter smaller than the inner diameter of the first hole and larger than the inner diameter of the second hole, the pipe protecting member having one end fixed to the pipe connecting jig and being disposed so as to cover at least an end of the second pipe.

2. The ESI sprayer according to claim 1 , wherein the first pipe and the second pipe are made of an insulating material.

3. The ESI sprayer according to claim 2 , further comprising

g) a voltage application unit configured to apply voltage to the pipe connecting jig.

4. The ESI sprayer according to claim 1 , wherein at least a part of the pipe protecting member is made of an elastic member.

5. The ESI sprayer according to claim 1 , further comprising

e) a protective tube disposed in an outer circumference of at least a part of the second pipe.

6. The ESI sprayer according to claim 5 , wherein

at least a part of the pipe protecting member is a tubular member, and

at least a part of the protective tube is covered with the tubular member.

7. The ESI sprayer according to claim 6 , wherein at least one of the two pipe s is made of fused silica.

8. The ESI sprayer according to claim 1 , wherein

in the pipe connecting jig, a through-hole having an inner diameter in which one end corresponds to an outer diameter of the first pipe and the other end corresponds to an outer diameter of the second pipe is made in an axial direction of a tubular body in which at least both ends are plastically deformable, and a gap forming protrusion protruding inward from a circumferential wall of the through-hole is provided in the tubular body.

9. The ESI sprayer according to claim 8 , wherein the gap forming protrusion is formed in a ring shape.

10. The ESI sprayer according to claim 8 , wherein the pipe connecting jig has a tapered shape toward both ends.

11. The ESI sprayer according to claim 8 , further comprising

f) a pipe diameter adjusting jig attached to a pipe having a diameter smaller than the inner diameter of the through-hole.

12. An ionizer comprising:

a) a housing in which a first hole and a second hole are made, the second hole being made at an end of the first hole and having an inner diameter smaller than an inner diameter of the first hole and having an end communicating with an ionization chamber;

b) an ESI sprayer attached to the housing,

the ESI sprayer including:

a first pipe having an outer diameter smaller than an inner diameter of the first hole;

a second pipe having an outer diameter smaller than an inner diameter of the second hole;

a pipe connecting jig made of a conductive material and connecting end faces of the first pipe and the second pipe separated from each other; and

a pipe protecting member configured to be an extendable tube made of a conductive material and having an outer diameter smaller than the inner diameter of the first hole and larger than the inner diameter of the second hole, the pipe protecting member having one end fixed to the pipe connecting jig and being disposed so as to cover at least an end of the second pipe,

c) a voltage application unit configured to apply directly or indirectly voltage to the pipe protecting member.