JP2014185883A - Probe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a probe capable of accurately measuring the state of a fluid even when a casing is thermally expanded.SOLUTION: A probe 1 comprises: a probe body 2 having a cooling medium circulated inside and extended in the direction of the tip along an axis line O; an energizing part 50 for energizing the probe body 2 in the direction of the tip; and a first positioning part 4 provided on the outer peripheral surface of the probe body 2 and having a first end surface 4A being an end surface facing to the direction of the tip. The outer dimension of the first end surface 4A is larger than that of a portion in the direction of the tip from the first positioning part 4 in the probe body 2.

Description

  The present invention relates to a probe.

  In general, in a combustor used in an engine, nitrogen oxides are generated when turbulence occurs in the flow of fluid in the combustor. Therefore, in order to suppress the generation of nitrogen oxides, a probe is inserted into a through-hole formed in the casing of the combustor, and the airflow state (temperature, component, etc.) of the fluid is measured by a measurement unit provided at the tip of the probe. ) Is measured and managed.

  As a temperature measurement device that is an example of a probe, a thermocouple that is inserted into a through-hole formed in an outer casing and has a tip disposed inside the diffuser, a protective tube that covers the thermocouple, and a thermocouple toward the interior of the diffuser The thing provided with the spring to press is proposed (refer the following patent document 1). In this temperature measuring device, since the thermocouple is pressed by the spring, the temperature inside the diffuser can be measured in a state where the tip of the thermocouple is in contact with the well of the tip portion of the protective tube.

JP 2007-206023 A

  Here, when the air flow state inside the combustor composed of the double casing of the outer casing and the inner casing is measured using the temperature measuring device described in Patent Document 1, the outer casing of the combustor is measured. A protective tube and a thermocouple are inserted into a through hole formed from the inner side toward the inner casing and measured. Since the internal temperature of the combustor is high, the casing constituting the combustor is thermally expanded. As the casing heats up, the protective tube also heats up and its tip extends further toward the inside of the combustor. Here, since the thermocouple is pressed by the spring so that the tip of the thermocouple contacts the well of the protection tube, the tip of the thermocouple also moves toward the inner side of the combustor as the protection tube heats up. To do. In other words, when the temperature of the combustor becomes high, the distance to the position (measurement point) of the thermocouple tip with respect to the outer surface of the inner casing becomes longer. There is a problem that can not be.

  The present invention has been made in consideration of such circumstances, and provides a probe that can accurately measure the state of a fluid even when a casing is thermally expanded.

In order to achieve the above object, the present invention employs the following means.
That is, the probe according to the present invention includes a probe main body in which a cooling medium circulates and extending in the distal direction along the axis, a biasing portion that biases the probe main body in the distal direction, and the probe main body A first positioning portion having a first end surface that is an end surface facing the tip direction, and the outer dimension of the first end surface is greater than the first positioning portion in the probe body. It is characterized by being larger than the outer dimension of the portion on the direction side.

In such a probe, since the urging portion urges the probe body in the distal direction, the first end surface of the first positioning portion provided on the outer peripheral surface of the probe body is in the direction opposite to the distal direction of the other members. Abuts the surface facing the. Therefore, even when the other member is thermally stretched, the distance from the surface facing the direction opposite to the tip direction of the other member to the tip of the probe body is hardly affected by the heat stretch.
Therefore, for example, even when the probe is mounted on the double casing and the entire casing is thermally stretched and the distance between the outer casing and the inner casing varies, the probe main body is moved toward the tip by the biasing portion. Therefore, the distance from the outer surface of the inner casing to the tip of the probe body is hardly affected by the thermal elongation.

  In the probe according to the present invention, an outer dimension of the first end surface may be equal to or smaller than an outer dimension of a portion of the probe main body on a side opposite to the distal direction side than the first positioning portion.

  In such a probe, the first positioning portion can be disposed on the outer surface of the inner casing by inserting the probe from the distal direction side of the probe toward the inner casing from the outer casing. Therefore, it is possible to measure the fluid state by installing the probe after the casing is assembled.

  In the probe according to the present invention, the first positioning portion may be a flange projecting radially outward from an outer peripheral surface of the probe main body.

  In such a probe, the urging portion urges the probe main body toward the inside of the casing, so that the flange provided on the outer peripheral surface of the probe main body contacts the contact surface from the radially outer side of the probe main body. The probe body can be positioned.

  In the probe according to the present invention, the probe main body is inserted into an inner casing and an outer casing provided on a side opposite to the distal end direction with respect to the inner casing, and the distal end of the probe main body is inserted into the inner casing. The first end surface may be in contact with a first contact surface facing the opposite direction formed in the inner casing.

  In such a probe, the first positioning portion is disposed on the first contact surface of the inner casing in a state where the probe main body is inserted into the double casing (inner casing, outer casing). The distance from the positioning part to the tip of the probe body can be shortened. Therefore, even when the entire casing is thermally expanded and the distance between the outer casing and the inner casing varies, the change in the distance from the outer surface of the outer casing to the first abutting surface is not affected. The distance from the abutting surface to the tip of the probe body is almost unchanged.

  The probe according to the present invention includes a holder that holds the probe main body so as to be relatively movable in the axial direction, and is provided on a portion of the holder on the opposite side of the tip direction from the first positioning portion. And a second positioning portion having a second end surface which is an end surface facing the tip direction.

  In such a probe, in a state where the second end surface of the holder is positioned with respect to the outer casing, the holder holds the probe body so as to be relatively movable in the axial direction. Thereby, since the attitude | position with respect to the outer casing of a probe main body is hold | maintained, the 1st end surface of a 1st positioning part and the 1st contact surface of an inner casing can be contact | abutted reliably.

  In the probe according to the present invention, the probe main body is inserted into an inner casing and an outer casing provided on a side opposite to the distal end direction with respect to the inner casing, and the distal end of the probe main body is inserted into the inner casing. The first end surface is in contact with a first contact surface facing the opposite direction formed in the inner casing, and the second end surface is formed in the opposite casing formed in the outer casing. You may contact | abut to the 2nd contact surface which faces a direction.

  In such a probe, in a state where the probe main body is inserted into the double casing (inner casing, outer casing), the first end surface of the first positioning portion contacts the first contact surface of the inner casing, The second end surface of the second positioning portion contacts the second contact surface of the outer casing. Therefore, even when the entire casing is thermally stretched and the distance between the outer casing and the inner casing varies, the posture of the probe body with respect to the outer casing is maintained. Thereby, the 1st end surface of a 1st positioning part and the 1st contact surface of an inner casing can be made to contact reliably. Further, by maintaining the contact state between the first end surface and the first contact surface, the distance from the outer surface of the inner casing to the tip of the probe body is hardly affected by the thermal expansion.

  According to the probe of the present invention, the probe body is urged by the urging portion toward the inner casing toward the distal end even when the entire casing is thermally expanded and the distance between the outer casing and the inner casing varies. Therefore, the distance from the outer surface of the inner casing to the tip of the probe body is hardly affected by the thermal elongation. Therefore, the state of the fluid can be accurately measured even when the casing is thermally expanded.

It is sectional drawing of the probe which concerns on one Embodiment of this invention. It is an enlarged view of the principal part of FIG. It is an enlarged view of the principal part of the probe which concerns on the modification of this invention.

A probe according to an embodiment of the present invention will be described below with reference to FIG.
The probe 1 is for measuring the state of the combustion gas (fluid) inside the casing 100 of the combustor, for example.
First, the combustor casing 100 to which the probe 1 according to this embodiment is attached will be described.

  The casing 100 includes an outer casing portion 110 (outer casing), an inner casing portion 120 (inner casing) disposed on the inner side of the combustor than the outer casing portion 110, the outer casing portion 110, and the inner casing portion 120. It has the communication casing parts 131 and 132 which communicate.

In addition, a casing space portion 140 (insertion hole 101) that is a space is formed between the outer casing portion 110 and the inner casing portion 120.
Here, for the sake of convenience, the lower side of the paper, which is the inner side (front end direction side) of the casing 100, is referred to as the X direction side, and the upper side of the paper, which is the outer side (opposite direction side of the front end direction), is referred to as the Y direction side.

  The outer casing 110 is formed with a first insertion hole 111 (insertion hole 101) that is a through hole in the XY direction. Further, the inner casing part 120 is formed with a second insertion hole part 121 (insertion hole 101) which is a through hole in the XY direction.

  As shown in FIG. 2, the inner casing portion 120 is formed with a first wall surface 122 (outer surface) that faces the inner surface 120 </ b> A and forms a wall portion of the casing space portion 140. A bent wall surface 123 that is bent at a substantially right angle from the first wall surface 122 toward the inside of the casing 100 (see FIG. 1) is formed. A first abutting surface 124 is formed that is bent at a substantially right angle from the end of the bent wall surface 123 and is substantially parallel to the first wall surface 122 and faces the outside of the casing 100, that is, faces the Y direction. Further, an insertion wall surface 125 bent from the first contact surface 124 toward the inside of the casing 100 is formed.

  The bent wall surface 123, the first contact surface 124, and the insertion wall surface 125 form a second insertion hole portion 121 (insertion hole 101) that penetrates the inner casing portion 120 in the XY direction.

  The first insertion hole 111, the casing space 140, and the second insertion hole 121 constitute an insertion hole 101 that communicates the inside and outside of the casing 100.

  Next, the probe 1 inserted through the insertion hole 101 of the casing 100 configured as described above will be described.

  The probe 1 includes a probe main body 2 inserted through the insertion hole 101 of the casing 100, a holder 3 provided on the proximal end side of the probe main body 2, and a flange 4 provided on the distal direction side of the probe main body 2 (first Positioning part).

  The probe main body 2 is a rod-shaped member extending in the distal direction along the axis O, and a detection unit 11 is provided at the distal end of the fluid pressure such as the temperature of the fluid. The probe main body 2 is inserted into the insertion hole 101 and is arranged so that the detection unit 11 is positioned in the space 100S formed inside the inner casing unit 120, so that the state of the combustion gas can be measured. .

  A cooling pipe (not shown) is arranged inside the probe body 2. A cooling medium R circulates in the cooling pipe.

  In the cross section along the axis O, the outer dimensions of the probe main body 2 are formed to be substantially the same as or smaller than the outer dimensions of the first insertion hole 111 and the second insertion hole 121.

  The holder 3 includes a first mounting portion 20 (second positioning portion) disposed on the outer peripheral side of the probe main body 2, a second mounting portion 30 fixed to the first mounting portion 20, and the interior of the first mounting portion 20. The urging portion 50 disposed in the first mounting portion 30 and the seal portion 60 disposed in the second mounting portion 30 are provided.

  The first mounting part 20 is mounted on the outer side of the outer casing part 110. The first mounting portion 20 extends in the direction of the axis O of the probe main body 2 and is formed in a cylindrical shape, and the probe main body 2 extends from the end of the first cylindrical portion 21 in the Y direction. And a first fixing portion 22 extending outward in the radial direction.

  The first cylindrical portion 21 is formed with a space portion 21 </ b> A penetrating in the direction of the axis O of the probe main body 2. The probe main body 2 is disposed in the space portion 21A.

  The second end surface 20 </ b> A facing the X direction of the first cylindrical portion 21 is in contact with the second contact surface 114 facing the Y direction formed on the outer casing portion 110. The second contact surface 114 of the outer casing portion 110 is a bottom surface of the recess 115 that is recessed from the outer surface 110A of the outer casing portion 110 in the X direction.

  The first fixing portion 22 is formed with a female screw 21B that penetrates in a direction substantially parallel to the direction of the axis O of the probe body 2. A plurality of the female screws 21 </ b> B are formed in the circumferential direction of the probe main body 2.

  The second mounting portion 30 is a second fixing portion 32 extending in the radial direction of the probe body 2, and a second fixing portion 32 that extends from the second fixing portion 32 toward the proximal end side of the probe body 2 and is formed in a cylindrical shape. It has the cylindrical part 31 and the cover part 40 which covers the edge part of the Y direction of the 2nd cylindrical part 31. As shown in FIG.

  The end surface 32A on the X direction side of the second fixing portion 32 and the end surface 22A on the Y direction side of the first fixing portion 22 are in contact with each other. The second fixing portion 32 is formed with a female screw 31B that penetrates in a direction substantially parallel to the axis O direction of the probe main body 2. A plurality of the female screws 31 </ b> B are formed at positions corresponding to the female screws 21 </ b> B of the first fixing portion 22 in the circumferential direction of the probe main body 2.

  The plurality of female screws 21B of the second fixing portion 32 and the plurality of female screws 31B of the first fixing portion 22 communicate with each other. Then, a bolt 36 is inserted into the communicating female screw 21B and female screw 31B. A nut 37 is screwed into the inserted bolt 36, whereby the first fixing portion 22 and the second fixing portion 32 are fixed.

  In the second cylindrical portion 31, an insertion space portion 38 penetrating in the direction of the axis O of the probe main body 2 is formed. Further, on the Y direction side of the insertion space portion 38 of the second cylindrical portion 31, a seal space portion 39 that is communicated with the insertion space portion 38 and has a diameter larger than that of the insertion space portion 38 is formed. The probe main body 2 is disposed in the insertion space portion 38 and the seal space portion 39.

  The cover portion 40 includes an insertion wall portion 41 in which a through hole 41 </ b> A through which the probe main body 2 is inserted, and an outer peripheral wall portion that is bent from the insertion wall portion 41 and provided on the outer peripheral side of the second cylindrical portion 31. 42. A gap 43 is formed so as to be surrounded by the insertion wall portion 41, the outer peripheral wall portion 42, and the second cylindrical portion 31 of the second mounting portion 30.

  Thus, the probe main body 2 is disposed inside the space 21A of the first cylindrical portion 21, the insertion space 38 of the second cylindrical portion 31, the seal space 39, and the through hole 41A of the cover 40. Yes. And the 1st mounting part 20 and the 2nd mounting part 30 hold | maintain the probe main body 2 so that relative movement is possible in the axis line O direction.

  The urging unit 50 includes a urging body 51 provided on the outer peripheral side of the probe main body 2 in the space 21 </ b> A of the first cylindrical portion 21 of the first mounting unit 20, and radially outward from the outer peripheral surface of the probe main body 2. And a flange portion 52 extending toward the surface.

  One end of the urging body 51 is attached to the end surface 32A of the second fixing portion 32 of the second mounting portion 30, and the other end is attached to the end surface 52A on the Y direction side of the flange portion 52 provided in the probe body 2. Yes. Thereby, the urging body 51 urges the probe body 2 in the X direction.

  The seal portion 60 includes a plurality of O-rings 61 disposed in the insertion space portion 38 of the second mounting portion 30, the insertion wall portion 41 of the cover portion 40, and the second cylindrical portion 31 of the second mounting portion 30 in the Y direction. And a sealing portion 62 arranged in a gap 43 formed between the side end portions.

  The O-ring 61 is an annular member disposed along the outer periphery of the probe main body 2. A plurality of O-rings 61 are arranged in the direction of the axis O of the probe body 2.

  The sealing portion 62 extends from the end of the cylindrical portion 63 in the Y direction toward the radially outer side of the probe main body 2 in which a space portion 63A into which the probe main body 2 is inserted is formed. And an extending wall portion 64.

  The end portion in the X direction of the cylindrical portion 63 is in contact with the O ring 61 disposed on the Y direction side among the plurality of O rings 61 disposed in the insertion space portion 38 of the second mounting portion 30. Further, the extending wall portion 64 is in contact with the end surface 41 </ b> B on the X direction side of the insertion wall portion 41 of the cover portion 40.

  In this way, the cylindrical portion 63 of the sealing portion 62 presses the O-ring 61 toward the inside of the casing 100, so that the space between the inner peripheral surface of the O-ring 61 and the outer peripheral surface of the probe main body 2 is sealed. The fluid inside 100 is prevented from leaking toward the outside of casing 100.

  The flange 4 protrudes from the outer peripheral surface of the probe main body 2 toward the radially outer side. The flange 4 is provided over the circumferential direction of the probe body 2. In other words, the flange 4 is an annular member in which a through hole 4X is formed in the direction of the axis O of the probe main body 2. The probe main body 2 is inserted into the through hole 4X and the outer peripheral surface of the probe main body 2 is The inner peripheral surface of the through hole 4X is fixed.

  Further, the flange 4 is disposed between the outer surface 110 </ b> A of the outer casing part 110 of the casing 100 and the inner surface 120 </ b> A of the inner casing part 120. Further, the flange 4 is provided on the X direction side of the first mounting portion 20 of the probe main body 2. In other words, the first mounting portion 20 of the probe main body 2 is provided on the Y direction side with respect to the flange 4.

  The first end surface 4A facing the X direction of the flange 4 is formed in the inner casing portion 120 and the first contact surface facing the Y direction by the biasing portion 50 biasing the probe body 2 in the X direction. 124.

  The outer dimension of the first end surface 4A is larger than the outer dimension of the portion 2P on the Y direction side of the flange 4 in the probe main body 2. In the present embodiment, as shown in FIG. 1, the outer dimension H1 of the flange 4 is larger than the outer dimension H2 of the portion 2P of the probe body 2 in the cross section along the axis O.

  Next, a method for mounting the probe 1 configured as described above to the casing 100 will be described.

  The probe body 2 of the probe 1 is inserted through the second insertion hole 121 formed in the inner casing portion 120, and the flange 4 is disposed on the first contact surface 124. Next, the outer casing part 110 and the inner casing part 120 are assembled.

  The first mounting portion 20 to which the urging portion 50 is attached is inserted through the probe main body 2. In addition, the first mounting portion and the second mounting portion 30 to which the seal portion 60 is attached are screwed together with bolts 36 and nuts 37.

  In the probe 1 configured as described above, the first end surface 4A on the X direction side of the flange 4 contacts the first contact surface 124 of the inner casing portion 120, and the second end surface 20A is the second end surface of the outer casing portion 110. The probe body 2 is urged by the urging unit 50 so as to abut on the abutment surface 114. Therefore, even when the casing 100 is thermally stretched and the distance between the outer casing portion 110 and the inner casing portion 120 varies, the probe body from the first contact surface 124 (the first end surface 4A of the flange 4) of the casing 100. The distance to the detection unit 11 provided at the tip of 2 is hardly affected by thermal elongation. In other words, the distance from the first abutment surface 124 of the inner casing portion 120 to the measurement point X to be measured where the detection portion 11 at the tip of the probe body 2 is arranged is almost unchanged, and the inner surface 120A of the inner casing portion 120 is changed. To the measurement point X does not fluctuate. Therefore, since the state of the fluid can be measured while keeping the position of the measurement point X constant, the state of the fluid can be accurately measured.

  Further, in the present embodiment, the first mounting portion 20 moves the probe main body 2 along the axis while the second end surface 20A of the first mounting portion 20 is positioned in contact with the second contact surface 114 of the outer casing portion 110. Hold relative to O direction. Accordingly, the posture of the probe main body 2 held by the first mounting portion 20 with respect to the outer casing portion 110 is maintained. Therefore, the parallel state of the first end surface 4A of the first positioning portion 4 and the first contact surface 124 of the inner casing portion 120 can be maintained, and the first end surface 4A and the first contact surface 124 can be securely connected. It can be made to contact.

  Further, since the flange 4 is arranged between the outer surface 110A of the outer casing portion 110 and the inner surface 120A of the inner casing portion 120 of the casing 100, the distance from the flange 4 to the detection portion 11 of the probe body 2 can be shortened. it can. Therefore, even when the casing 100 is thermally expanded in the inner and outer directions and the distance between the outer casing portion 110 and the inner casing portion 120 varies, the first abutting surface on which the flange 4 abuts from the outer surface 110A of the outer casing portion 110. Since it is not affected by the change in the distance up to 124, it is possible to measure the state of the fluid while keeping the position of the measurement point X constant while suppressing the influence of thermal expansion.

  Further, the urging portion 50 urges the probe main body 2 in the X direction, that is, the inner direction of the casing 100, so that the flange 4 provided on the outer peripheral surface of the probe main body 2 is inward in the circumferential direction of the probe main body 2. It contacts the first contact surface 124 of the casing part 120. Therefore, the contact state between the first end surface 4A on the X direction side of the flange 4 and the first contact surface 124 can be maintained over the circumferential direction of the probe body 2. Therefore, since the movement of the probe body 2 in the X direction can be surely restricted, the state of the fluid can be measured while the position of the measurement point X is kept constant.

  Note that the probe 1 may be mounted on the casing 100 after the outer casing portion 110 and the inner casing portion 120 are assembled. In this case, by making the diameter of the first insertion hole 111 of the outer casing part 110 substantially the same as the diameter of the flange 4, from the outer end of the probe 1 toward the inner casing 120 from the front end side of the probe 1. The probe 1 can be inserted through the first insertion hole 111.

(Modification)
Moreover, the modification of embodiment shown above is mainly demonstrated using FIG.
In the probe 201, the probe main body 202 has a main body portion 202A and a distal end portion 202B that is disposed on the X direction side of the main body portion 202A and has a smaller diameter than the main body portion 202A.

  A portion on the X direction side of the main body portion 202 </ b> A is a first positioning portion 204. Further, the surface of the first positioning portion 204 facing the X direction is a first end surface 204A.

  In the cross section along the axis O, the outer dimension H3 of the first end surface 204A of the first positioning portion 204 is equal to or smaller than the outer dimension H2 of the portion 202Q on the Y direction side of the first positioning portion 204 in the main body portion 202A of the probe main body 202. It is. In the present embodiment, in the cross section along the axis O, the outer dimension H3 of the first end face 204A is substantially the same as the outer dimension H2 of the portion 202Q of the probe body 202.

  A second insertion hole 221 corresponding to the shape of the distal end portion 202 </ b> B of the probe main body 202 is formed in the inner casing portion 120. The inner casing portion 120 is formed with a first contact surface 224 having a shape corresponding to the first positioning portion 204.

  In the probe 201 configured as described above, the outer dimension H3 of the first end surface 204A of the first positioning portion 204 is substantially the same as the outer dimension H2 of the portion 202Q of the probe main body 202. Therefore, the probe 201 can be inserted from the tip 201X direction side of the probe 201 toward the inner casing portion 120 from the outer casing portion 110 (see FIG. 1). Then, the first end surface 204 </ b> A of the first positioning portion 204 can be disposed on the first contact surface 224 of the inner casing portion 120. Therefore, the probe 201 can be installed after the casing 100 is assembled, and the state of the fluid can be measured.

  The various shapes and combinations of the constituent members shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  In the modified example, the external dimension H3 of the first end surface 204A of the first positioning part 204 is substantially the same as the external dimension H2 of the portion 202Q of the probe main body 202, but the present invention is not limited to this, and the main body part 202A may be formed to taper as it goes in the X direction. In this case, the end surface of the main body portion facing the X direction is the first end surface, and the outer dimension of the first end surface is equal to or smaller than the outer dimension of the portion of the main body portion on the Y direction side from the first end surface. Even in such a configuration, the probe can be inserted from the outer casing portion 110 toward the inner casing portion 120 from the tip direction side of the probe.

DESCRIPTION OF SYMBOLS 1 ... Probe 2 ... Probe main body 3 ... Holder 4 ... Flange (1st positioning part)
4A ... first end face 4X ... through hole 11 ... detection part 20 ... first mounting part (second positioning part)
20A ... 2nd end surface 21 ... 1st cylindrical part 21A ... Space part 22 ... 1st fixing | fixed part 22A ... End surface 30 ... 2nd mounting part 31 ... 2nd cylindrical part 32 ... 2nd fixing | fixed part 32A ... End surface 36 ... Bolt 37 ... Nuts 38 ... Insertion space 39 ... Seal space 40 ... Cover 41 Insertion wall 41A ... Through hole 41B ... End face 42 ... Outer wall 43 ... Gap 50 ... Energizing part 51 ... Energizing body 52 ... Elevator 52A ... End face 60 ... Seal part 61 ... Ring 62 ... Sealing part 63 ... Cylindrical part 63A ... Space part 64 ... Extension wall part 100 ... Casing 100S ... Space 101 ... Insertion hole 110 ... Outer casing part (outer casing)
110A ... outer surface 111 ... first insertion hole (insertion hole)
114 ... second contact surface 120 ... inner casing portion (inner casing)
120A ... inner surface 121 ... second insertion hole (insertion hole)
122 ... first wall surface 123 ... bent wall surface 124 ... first contact surface 125 ... insertion wall surface 131 ... communication casing part 140 ... casing space part (insertion hole)
201 ... probe 202 ... probe body 202A ... main body portion 202B ... tip portion 204 ... first positioning portion 204A ... first end surface 221 ... second insertion hole 224 ... first contact surface R ... cooling medium X ... measurement point

Claims (6)

A cooling medium circulates inside, and a probe body extending in the distal direction along the axis,
An urging portion for urging the probe body toward the distal direction;
A first positioning portion provided on the outer peripheral surface of the probe main body and having a first end surface which is an end surface facing the distal direction;
The probe according to claim 1, wherein an outer dimension of the first end surface is larger than an outer dimension of a portion of the probe main body on the distal direction side than the first positioning portion.   2. The probe according to claim 1, wherein an outer dimension of the first end surface is equal to or smaller than an outer dimension of a portion of the probe main body on the side opposite to the tip direction from the first positioning portion.   2. The probe according to claim 1, wherein the first positioning portion is a flange projecting radially outward from an outer peripheral surface of the probe main body. The probe body is inserted into an inner casing and an outer casing provided on the opposite side of the tip direction from the inner casing,
The tip of the probe body is located in the space inside the inner casing,
The probe according to any one of claims 1 to 3, wherein the first end surface is in contact with a first contact surface that is formed in the inner casing and faces in the opposite direction. A holder for holding the probe body so as to be relatively movable in the axial direction;
The holder further includes a second positioning portion provided at a portion on the opposite side of the tip direction from the first positioning portion and having a second end surface that is an end surface facing the tip direction. The probe according to any one of claims 1 to 3. The probe body is inserted into an inner casing and an outer casing provided on the opposite side of the tip direction from the inner casing,
The tip of the probe body is located in the space inside the inner casing,
The first end surface is in contact with a first contact surface facing the opposite direction formed in the inner casing,
The probe according to claim 5, wherein the second end surface is in contact with a second contact surface that is formed on the outer casing and faces in the opposite direction.

Images