JP2003106951A - Sample fluid variable pressure reducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sample fluid variable pressure reducing device resolving accumulation of sample fluid and reducing pressure of the sample fluid in a state so that the sample fluid can be accurately analyzed. SOLUTION: In a variable pressure reducing mechanism part 23, a base end of a pressure regulating pipe 24 is connected to a one end opening of a cylindrical casing 33, an internal space 34 is communicated with a pressure regulating hole 25, a slide member 35 is provided in the internal space 34, a base end of a core wire 26 is fixed to the slide member 35, a female screw part 35a is formed on the slide member 35, a male screw part 37a is formed on an outer circumferential face of a screw shaft 37 and it is screwed in the female screw part 35a, a one end of the screw shaft 37 is protruded outside the casing 33 in a piercing state from another end opening of the casing 33 positioned in an opposite side to the pressure regulating pipe 24, the opening is sealed by a shaft seal part 39, a sample fluid outlet 46 is opened in a casing 33 side face, a pressure of the sample fluid inputted from a sample fluid inlet 27 is reduced in the pressure regulating hole 25, the sample fluid is passed through the internal space 34, and the sample fluid is delivered from the sample fluid outlet 46.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for variably decompressing a sample fluid, and more particularly to decompressing high-pressure water as a sample fluid in water quality control work of boiler water in power generation equipment such as a thermal power plant or a nuclear power plant. The present invention relates to a sample fluid variable decompression device used when performing.

[0002]

2. Description of the Related Art In power generation facilities such as thermal power plants and nuclear power plants, water quality analysis of boiler water is performed to control the water quality of the boiler, and the high-pressure boiler water to be analyzed is
A sample water is sampled at a specified flow rate from a specified location in the boiler water circulation system, and a water quality analyzer (sample fluid analyzer) is used.
Will be introduced to.

Boiler water as this sample fluid is, for example, Japanese Industrial Standards (JIS concerning water quality management of boilers).
According to (JIS B8224-1993)), a predetermined flow rate (1-2
It is required to be collected at a rate of 1 / min). In order to meet such requirements, the sample collection system is provided with a sample fluid variable decompression device. Then, the high-pressure boiler water in the circulation system is decompressed by passing through the sample fluid variable decompression device.

As a conventional sample fluid variable decompression device, there is a type called a double core wire type as shown in FIG.
This type of sample fluid variable decompression device 1 includes an inlet side pressure adjusting thin tube 2a connected to a sample fluid inlet pipe, and an outlet side pressure adjusting thin tube 2b connected to a sample fluid outlet pipe, and has core wires 4a and 4b. The pressure adjusting thin tubes 2a and 2b are inserted into the pressure adjusting thin tubes 2a and 2b so as to be able to move forward and backward, respectively,
Gaps are formed between the inner peripheral surface of the core wire 4a and the outer peripheral surface of the core wire 4a, and between the inner peripheral surface of the outlet side pressure adjusting thin tube 2b and the outer peripheral surface of the core wire 4b, and the tubular casing 5 is formed into a pressure adjusting thin tube. 2 is connected to the base end of the casing 5, the internal space 6 of the casing 5 is communicated with the gap, and a slide member 7 is provided in the internal space 6 to fix the base end of the core wire 4.
The male screw portion of the screw shaft 8 is screwed into the female screw portion formed on the casing 5, the one end of the screw shaft 8 is projected to the outside of the casing 5, and the casing 5 located on the opposite side to both the pressure adjusting thin tubes 2a and 2b.
The screw shaft 8 inserted by the shaft sealing portion 9 provided in the opening of the
It is configured by sealing.

When a sample fluid is introduced into the sample fluid variable decompression device 1 from the sample fluid inlet pipe, the sample fluid enters the inlet side pressure adjusting thin tube 2a and the inlet side pressure adjusting thin tube 2 is inserted.
The pressure is reduced by receiving a pipe frictional resistance through a gap between a and the core wire 4a. The depressurized sample water flows into the internal space 6 of the casing 5 and is filled therewith, and then the flow direction is reversed,
The pressure is further reduced through the gap between the outlet side pressure adjusting thin tube 2b and the core wire 4b, flows through the sample fluid outlet pipe, and is sent to the sample fluid analyzer (not shown). When adjusting the amount of pressure reduction, the screw shaft 8 is rotated to move the slide member 7, and the core wire 4 is moved back and forth in the pressure adjusting thin tube 2.
Then, the formation length of the gap increases or decreases, and therefore the pipe frictional resistance in each of the pressure adjusting thin tubes 2a and 2b changes. This makes it possible to adjust the decompression amount of the sample fluid.

[0006]

However, in the conventional double core wire type sample fluid variable decompression device, the sample fluid filled in the internal space of the casing during the decompression operation of the sample fluid remains after the sample fluid is collected. I will continue. Further, in the double core wire type sample fluid variable decompression device, the flow directions are opposite to each other on the inlet side and the outlet side, and the flow is reversed in the internal space of the casing, so stagnation is likely to occur in the internal space. Therefore, at the next sample fluid analysis, if a new sample fluid flows into this sample fluid variable decompression device, the newly introduced sample fluid will be confused with the sample fluid that has stayed, and accurate liquid quality measurement will be possible. It will be difficult to do.

Further, during the depressurizing operation of the sample fluid, the sample fluid filling the internal space does not pass through the outlet side pressure adjusting thin tube, so that the sample frictional resistance in the outlet side pressure thin tube is not received. Therefore, the pressure is higher than that in the outlet side pressure pipe. Therefore, the sample water may leak from the shaft seal portion, and it becomes difficult to supply the sample fluid while maintaining a stable flow rate, and the sample fluid analysis is performed according to the standard that requires the constant flow rate as described above. This can be difficult to do.

The present invention has been made in view of the above circumstances, and an object thereof is to eliminate retention of the sample fluid in the internal space of the casing and to perform accurate sample fluid analysis. It is an object to provide a sample fluid variable decompression device that decompresses a fluid.

[0009]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object. According to the first aspect of the present invention, a pressure adjusting hole penetrating from a sample fluid inlet at the tip to a base end is provided. And a pressure adjusting portion having a core wire inserted into the pressure adjusting hole from the insertion port in a state of being movable back and forth, and an internal space connected to the base end of the pressure adjusting tube to form the pressure adjusting hole. A sample fluid variable decompression device comprising: a tubular casing communicating with a core member; a slide member that fixes one end of the core wire; and a displacing means that displaces the slide member. Open an exit,
The sample fluid variable decompression device is characterized in that the sample fluid that has flowed in from the sample fluid inlet is decompressed in the pressure adjusting hole and then discharged from the sample fluid outlet through the internal space.

According to a second aspect of the present invention, there is provided the sample fluid variable decompression device according to the first aspect, wherein the sample fluid outlet is opened on the side surface of the casing.

According to a third aspect of the present invention, the displacing means comprises a female screw portion provided on the slide member and a screw shaft having a male screw portion which is screwed to the female screw portion, and is disposed outside the casing. The output side of the speed change mechanism is connected to one end of the projecting screw shaft.
The sample fluid variable decompression device according to 1.

According to a fourth aspect of the present invention, the speed change mechanism is constituted by a planetary gear mechanism, and the planetary gear mechanism accelerates the rotation input to rotate the screw shaft. The sample fluid variable decompression device according to 1.

According to a fifth aspect of the present invention, there is provided the sample fluid variable decompression device according to the third aspect, wherein the output side of the servomotor is connected to the input side of the speed change mechanism.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a sample fluid variable decompression device 21 which is an embodiment of the present invention.

The sample fluid variable decompression device 21 includes a pressure adjusting section 22 for decompressing an inflowing high-pressure sample fluid (for example, boiler water), and a variable decompressing mechanism section 23 for setting the degree of decompression in the pressure adjusting section 22. It is roughly composed of

The pressure adjusting portion 22 has a cylindrical pressure adjusting tube 24 and a pressure adjusting hole 2 penetrating from a tip end to a base end.
5, the core wire 26 is inserted into the pressure adjusting hole 25 through the insertion opening 25a at the base end so as to be movable back and forth (that is, displaceable). As shown in FIG. 2A, the pressure adjusting hole 25 is opened at a position offset from the central axis of the pressure adjusting tube 24. And this pressure adjusting pipe 24
Uses the opening on the distal end side as the sample fluid inlet 27 to enlarge the inner diameter, and enables connection of the sample fluid inlet pipe 28 from the boiler to the opening, and the opening on the proximal end side is the insertion port 25 of the core wire 26 described later.
a.

A flange 29 is provided at the base end of the pressure adjusting pipe 24, and the pressure adjusting section 22 and the variable pressure reducing mechanism section 23 have a variable pressure reducing mechanism section 23 on the base end side plane of the flange 29. Is connected in contact with. The connection between the pressure adjusting unit 22 and the variable pressure reducing mechanism unit 23 will be described later.

The core wire 26 has a tapered tip, and has a length such that the tip does not protrude from the pressure adjusting hole 25 regardless of the advance / retreat position in the pressure adjusting hole 25. Further, the wire diameter of the core wire 26 is formed smaller than the hole diameter of the pressure adjusting hole 25. Therefore, a gap G1 is formed between the inner peripheral surface of the pressure adjusting hole 25 and the outer peripheral surface of the core wire 26. It is formed.

The variable pressure reducing mechanism 23 connects the base end of the pressure adjusting pipe 24 to the one end opening of the tubular casing 33, communicates the internal space 34 of the casing 33 with the pressure adjusting hole 25, and the internal space 34 A slide member 35 is provided inside, the base end of the core wire 26 is fixed to the slide member 35, a female screw portion 35a is formed at a position deviated from the fixing position, and a male screw portion 37a is formed on the outer peripheral surface. The formed screw shaft 37 is inserted into the internal space 34, and the screw shaft 3
The male threaded portion 37a of No. 7 is screwed into the female threaded portion 35a, and the shaft sealing portion 39 is provided at the other end opening of the casing 33 located on the side opposite to the pressure adjusting pipe 24. It is configured by sealing between the screw shaft 37 and the screw shaft 37 that is inserted into the casing 33 by protruding to the outside of the casing 33.

The casing 33 is formed of a tubular member, and as shown in FIG. 2 (b), the central axis of the inner peripheral surface is set at a position offset from the central axis of the outer peripheral surface to form a cylindrical inner portion. A space 34 is formed. In the present embodiment, the central axis of the inner peripheral surface is set at a position offset downward from the central axis of the outer peripheral surface in the figure. Therefore, the casing 33 is thick on one side (upper side in the figure) and on the other side (lower side in the figure).
Form a thin-walled annular cross section.

A slide member 35 is provided in the internal space 34 of the casing 33. This slide member 35
Is a thick, substantially disk-shaped member, the outer diameter of which is set smaller than the inner diameter of the inner space 34 of the casing 33, and a gap G2 is formed between the outer peripheral surface and the inner peripheral surface of the casing 33. The sample fluid is allowed to flow in the gap G2.

The slide member 35 is provided with a core wire through hole 35b parallel to the central axis corresponding to the position of the base end of the core wire 26 inserted into the pressure adjusting hole 25, and the core wire through hole 35b is formed. It is fixed in a state in which the base end of the core wire 26 is inserted into 35b. Further, the slide member 35 is provided with a screw shaft through hole 35c at a position separated from the core wire through hole 35b by a predetermined distance, and a female screw is formed on the inner peripheral surface of the screw shaft through hole 35c to form a female screw. The part 35a is formed.

The screw shaft 37 has a male screw portion 37a formed on the outer peripheral surface of the rod-shaped member by forming a male screw that can be screwed into the female screw portion 35a of the slide member 35 from the tip to the middle.
The male screw portion 37 a is provided in the internal space 34 of the casing 33 in a state of being screwed into the female screw portion 35 a of the slide member 35. This screw shaft 37 has a pressure adjusting tube 24 at its tip.
Is rotatably supported at the base end of the shaft, the base end side is projected to the outside of the casing 33, and is sealed by a shaft sealing portion 39 described later. Further, the screw shaft 37 has a rotation handle attached to a protruding end 37b protruding outside the casing 33, or a rotary drive source such as a servo motor connected via a transmission mechanism (including a speed-up or speed-down transmission mechanism). It is possible to rotate by doing so (both not shown).

The shaft sealing portion 39 is for sealing the screw shaft 37 protruding to the outside of the casing 33, and as described above, is provided in the opening of the casing 33 located on the side opposite to the pressure adjusting pipe 24. Has been. Specifically, the shaft sealing portion 39 has a substantially tubular packing box 41 screwed into the opening of the casing 33, and an O-ring or the like is provided between the outer peripheral surface of the packing box 41 and the inner peripheral surface of the casing 33. A seal member 42 is provided for sealing, a screw shaft 37 is inserted through the center of the packing box 41, and a packing 43 such as a gland packing is provided between the inner peripheral surface of the packing box 41 and the outer peripheral surface of the screw shaft 37 to provide a screw. The shaft 37 is sealed, and the packing 43 is pressed by the packing presser 44. In the present embodiment, the shaft sealing portion 39 uses a gland packing, but the present invention is not limited to this, and the rotatable screw shaft 37 is used.
As long as the shaft can be sealed, for example, a mechanical seal may be provided in the packing box 41 of the shaft sealing portion 39 to seal the screw shaft 37.

The variable decompression mechanism 23 has a sample fluid outlet 46 communicating with the internal space 34 in a part of the casing 33. Specifically, this sample fluid outlet 46
Is opened on the side surface of the casing 33 in the vicinity of the shaft seal portion 39, and by connecting the sample fluid outlet pipe 48 communicating with the sample fluid analyzer 47, the decompressed air that has flowed into the internal space 34 of the casing 33 has been released. The sample fluid can be sent to the sample fluid analyzer 47 while flowing out of the sample fluid variable decompression device 21.

The sample fluid variable decompression device 21 having the pressure adjusting unit 22 and the variable decompression mechanism unit 23 as described above connects these constituent elements as follows. That is, in the sample fluid variable decompression device 21, the proximal end side plane of the flange 29 provided on the pressure adjusting pipe 24 of the pressure adjusting unit 22 is brought into contact with the one end opening of the casing 33 of the variable decompressing mechanism unit 23, and the tip of the flange 29 is contacted. The connecting cap 50 is locked to the side plane, and the connecting cap 50 is screwed into the casing 33 to maintain the contact state between the pressure adjusting unit 22 and the variable pressure reducing mechanism unit 23. And the flange 2
By providing a seal material (not shown) such as a seal ring or a gasket at the contact portion between the casing 9 and the casing 33,
It prevents the sample fluid from leaking from the contact point.

The sample fluid variable decompression device 21 is
The outer peripheral surface of the casing 33 on the other end side is reduced in diameter and a male screw is engraved. The reduced diameter portion is inserted into the opening provided in the support plate 52, and the nut 53 is screwed into the male screw to form the nut. By sandwiching the support plate 52 between 53 and the base end surface of the reduced diameter portion of the casing 33, the sample fluid variable decompression device 21 can be fixed to the support plate 52.

As described above, the sample fluid variable decompression device 21
When a high-pressure sample fluid flows in from the sample fluid inlet 27, the sample fluid passes through the pressure adjusting hole 25 and flows through the gap G1 between the pressure adjusting hole 25 and the core wire 26 from the middle. In the gap G1, the sample fluid is decompressed by the tube frictional resistance from the inner peripheral surface of the pressure adjusting hole 25 and the outer peripheral surface of the core wire 26.

The depressurized sample fluid flows out from the insertion port 25a of the pressure adjusting hole 25, and flows into the internal space 34 of the variable depressurizing mechanism section 23, more specifically, the base end surface of the pressure adjusting tube 24 in the internal space 34. It flows into the front internal space 34a defined by the slide member 35. Then, the depressurized sample fluid passes through the gap G2 between the inner peripheral surface of the casing 33 and the outer peripheral surface of the slide member 35, and passes through the rear internal space 34b.
Flow into. Then, the sample fluid flows out from the sample fluid outlet 46 and flows through the sample fluid outlet pipe 48 to the sample fluid analyzer 47.

When the amount of pressure reduction is adjusted, the screw shaft 37 is rotated to slide (displace) the slide member 35 in the front-rear direction, and the core wire 26 is moved forward and backward in the pressure adjusting hole 25. Then, the formation length of the gap G1 increases or decreases, and the pipe frictional resistance in the pressure adjusting hole 25 changes. When the sample fluid flows into the pressure adjusting hole 25 adjusted as described above, the sample fluid flows into the pressure adjusting hole 2 forming the gap G1.
From the inner peripheral surface of 5 and the outer peripheral surface of the insertion portion of the core wire 26, pipe friction resistance is received, and a sample fluid decompressed to a desired pressure is obtained.

Thus, the sample fluid variable decompression device 21
Since the sample fluid outlet 46 is opened in a part of the casing 33, specifically, in the side surface of the casing 33 near the shaft sealing portion 39, the sample fluid flowing from the sample fluid inlet 27 is introduced into the pressure adjusting hole 25. After decompressing with, the internal space 34 is passed through in one direction and flows out from the sample fluid outlet 46.
Since the inlet and outlet of the sample fluid are opened near both ends of the internal space 34, almost the entire internal space 34 can be used as a flow path for the sample fluid. Therefore, while the sample fluid is flowing into the sample fluid variable decompression device 21, the sample fluid can flow in one direction and flow out from the sample fluid outlet 46 without being retained in the internal space 34. Therefore, it is possible to prevent the accuracy of the sample fluid analysis from being deteriorated due to the confusion of the retained sample fluids and to perform the accurate sample fluid analysis.

Further, in the vicinity of the outlet of the internal space 34, that is,
In the vicinity of the shaft sealing portion 39, the sample fluid is already at low pressure. Therefore, the pressure applied to the shaft sealing portion 39 can be suppressed to a low pressure, and the leakage of the sample fluid from the shaft sealing portion 39 can be surely suppressed.

By the way, in the above embodiment,
One pressure adjusting hole 25 is opened in the pressure adjusting tube 24, and the sample fluid is mainly depressurized by the pressure adjusting hole 25. Therefore, in order to configure a pressure reducing device having a wide range of pressure adjustment, it is necessary to lengthen the pressure adjusting hole 25 and lengthen the stroke of movement of the core wire 26.

However, when the stroke of the movement of the core wire 26 is lengthened, the screw shaft 37 is rotated many times to set the core wire 26 in order to set the sample fluid variable decompression device 21 so as to obtain a desired decompression amount. It has to be advanced and retracted, and it is difficult to quickly set the pressure reduction amount.

Therefore, in the sample fluid variable decompression device according to this embodiment, the screw shaft 37 protruding outside the casing 33 is used.
The projecting end 37b may be connected to the output side of a speed change mechanism that speeds up the rotation input so that the desired pressure reduction amount can be set quickly and easily.

For example, as shown in FIG.
In the sample fluid variable decompression device according to the embodiment, the planetary gear mechanism 62 is used as the speed change mechanism (speed increasing mechanism) to facilitate the decompression amount setting. This sample fluid variable decompression device 21
Is provided with a substantially U-shaped bracket 63 on the casing 33 so as to cover the shaft sealing portion 39, and one end of the screw shaft 37, that is, a protruding end 37b protruding from the casing 33 is passed through the bracket 63. , The output side of the planetary gear mechanism 62 is connected to the projecting end 37b of the screw shaft 37, the planetary gear mechanism 62 is fixed to the bracket 63, and the handle wheel 65 is connected to the input shaft of the planetary gear mechanism 62 via the shaft 64. To do. In addition, in this handle wheel 65,
A tachometer 66 for displaying the number of rotations is provided on the surface of the disk-shaped main body.

When the handle wheel 65 is rotated, the rotation input is input to the input side of the planetary gear mechanism 62 through the shaft 64, accelerated by the planetary gear mechanism 62, and output from the output side. Then, the increased rotation input rotates the screw shaft 37 to move the slide member 35 and the core wire 26 forward and backward. That is, the core 26 can be moved by rotating the screw shaft 37 more than the number of rotations of the handle wheel 65. Therefore, the range (length) of the gap G1 that causes the pipe frictional resistance is increased / decreased, and the decompression amount of the sample fluid can be set quickly and easily without rotating the screw shaft 37 many times.

Further, the planetary gear mechanism 62 includes a handle wheel 6
Since it is smaller than 5 and compact, and the output-side rotation shaft and the input-side rotation shaft can be provided coaxially, it is possible to provide a sample fluid variable decompression device that realizes space saving.

In the embodiment described above,
The slide member 35 is provided with a gap G2 between the slide member 35 and the internal space 34, and the sample liquid is allowed to pass through the gap G2. However, the present invention is not limited to this, and the slide member 35 is provided on the pressure adjusting pipe 24 side. From the sample fluid outlet 46 side may be provided, or a notch may be provided in the outer peripheral surface to form the sample fluid flow path. In short, the slide member 35
The sample fluid that has flowed into the front internal space 34a separated by
It should flow out from. Further, the pressure adjusting pipe 24 and the casing 33 may be integrated.

In the above embodiment, the slide member 3
The displacement means for displacing 5 comprises a screw shaft 37 having a male screw portion 37a and a female screw portion 35a of the slide member 35 screwed to the male screw portion 37a, and one end of the screw shaft 37 is projected to the outside of the casing 33. However, the present invention is not limited to this. For example, it may be configured by a cylinder and a connecting shaft, or may be configured by meshing a rack gear and a pinion gear.

[0041]

As described above, the present invention has the following effects. That is, according to the first aspect of the invention, the sample fluid outlet is opened on the side surface of the casing, the sample fluid flowing from the sample fluid inlet is depressurized in the pressure adjusting hole, and then discharged from the sample fluid outlet through the internal space. Since this is done, it is possible to prevent the sample fluid from staying in the internal space. Therefore, it is possible to suppress the error in the sample fluid analysis due to the confusion of the retained sample fluid.

Further, according to the invention described in claim 2, since the sample fluid outlet is opened on the side surface of the casing, for example,
When one end of the shaft forming a part of the displacement means is projected outside the casing and sealed by the shaft sealing portion, the sample fluid pressure in the vicinity of the shaft sealing portion can be brought close to the sample fluid pressure at the sample fluid outlet. Therefore, the pressure applied to the shaft sealing portion can be brought close to a low pressure to suppress the leakage of the sample fluid from the shaft sealing portion.

According to the third aspect of the invention, since the output side of the speed change mechanism is connected to one end of the screw shaft protruding to the outside of the casing, the stroke of core movement for widening the pressure reduction adjustment range. Even if the length is increased, the desired reduced pressure state can be adjusted quickly and easily.

Further, according to the invention described in claim 4, since the speed change mechanism is constituted by the planetary gear mechanism, the sample fluid variable decompression device realizing space saving while maintaining the ease of setting the decompression state. Can be provided.

According to the fifth aspect of the invention, since the output side of the servomotor is connected to the input side of the speed change mechanism, the displacement of the core wire can be adjusted quickly and accurately.

[Brief description of drawings]

FIG. 1 is a sectional view of a sample fluid variable decompression device according to an embodiment of the present invention.

2A and 2B are sectional views of the sample fluid variable decompression device at the location shown in FIG. 1, where FIG. 2A is a sectional view taken along line AA and FIG. 2B is a sectional view taken along line BB.

FIG. 3A is a cross-sectional view of a sample fluid variable decompression device equipped with a planetary gear mechanism, and FIG. 3B is a front view of a handle wheel provided in this sample fluid variable decompression device.

FIG. 4 is a cross-sectional view of a double core wire type sample fluid variable decompression device which is a conventional sample fluid variable decompression device.

[Explanation of symbols]

1 Double core wire type sample fluid variable decompressor 2 Pressure adjustment thin tube 2a entrance side 2b exit side 4 core wire 4a entrance side 4b exit side 5 casing 6 internal space 7 Slide member 8 screw shaft 9 Shaft seal part 21 Sample fluid variable decompressor 22 Pressure regulator 23 Variable pressure reduction mechanism 24 Pressure adjustment tube 25 Pressure adjusting hole 25a insertion slot 26 core wire 27 Sample fluid inlet 28 Sample fluid inlet piping 29 flange 33 casing 34 Internal space 34a forward 34b backward 35 Slide member 35a female screw part 35b Core wire through hole 35c Screw shaft through hole 37 screw shaft 37a Male thread part 37b protruding end 39 Shaft seal part 41 packing box 42 Seal member 43 packing 44 Packing foot 46 Sample fluid outlet 47 Sample fluid analyzer 48 Sample fluid outlet piping 50 connecting caps 52 Support plate 53 nuts 62 Planetary gear mechanism 63 bracket 64 shaft 65 steering wheel car 66 tachometer

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2G052 AA06 AB01 AC23 AC25 AD06                       AD26 AD46 BA03 BA28 CA04                       CA11 CA38 DA09 DA13 DA25                       HA15 HA18 HC10 HC25 HC43                       JA09

Claims (5)

[Claims] 1. A pressure adjusting section having a pressure adjusting tube having a pressure adjusting hole penetrating from a sample fluid inlet at a tip end to a base end, and a core wire inserted in the pressure adjusting hole from the insertion port in a retractable manner. A tubular casing connected to the base end of the pressure adjusting pipe and communicating the internal space with the pressure adjusting hole; a slide member having one end of the core wire fixed; and a displacement means for displacing the slide member. A sample fluid variable decompression device equipped with a sample fluid outlet opened in a part of the above casing, decompressing the sample fluid flowing from the sample fluid inlet in the pressure adjusting hole, and then passing through the interior space from the sample fluid outlet. A sample fluid variable decompression device characterized in that it is made to flow out. 2. The sample fluid variable decompression device according to claim 1, wherein the sample fluid outlet is opened on the side surface of the casing. 3. The displacing means comprises a female screw portion provided on a slide member and a screw shaft having a male screw portion to be screwed into the female screw portion, and one end of the screw shaft protruding outside the casing. The sample fluid variable decompression device according to claim 1 or 2, wherein the output side of the transmission mechanism is connected. 4. The sample fluid variable decompression pressure according to claim 3, wherein the speed change mechanism is composed of a planetary gear mechanism, and the planetary gear mechanism accelerates a rotation input to rotate the screw shaft. apparatus. 5. The sample fluid variable decompression device according to claim 3, wherein an output side of the servomotor is connected to an input side of the speed change mechanism.