JPH10206292A - Thermal desorption device for gas component collecting tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate fitting of a gas component collecting tube. SOLUTION: This device is constructed by providing a case body 2 equipped with a rotating type opening-closing cover 21, a heater 11 heating a gas component collecting tube K therein, two joints 3 and 4 retaining inserted end parts of the gas component collecting tube K in the vicinity thereof, communication pipes 12 and 13 communicating with the end parts of the gas component collecting tube K through the joints 3 and 4 respectively, a guide 14 provided inside the case body 2 along the longitudinal direction of the gas component collecting tube K, a holding member 15 for moving forward along the guide 14 and holding the joint 3 and a pressing spring 16 pressing the joint 3 to the joint 4 side through the intermediary of the holding member 15. By providing a hold canceling member 17 between the holding member 15 and the opening- closing cover 21, in this case, the holding member 15 is moved back to the side opposite to the pressing direction of the pressing spring 16 in accordance with an operation of opening the opening-closing cover 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal desorption device for a gas component collecting tube, and more particularly to a clinical test in a medical field.
The present invention relates to a thermal desorption device for a gas component collection tube suitable for use in disease state management, health inspection, drunk driving, drug control, fire cause investigation, and the like.

[0002]

2. Description of the Related Art The overall flow of a conventional gas sample analysis will be described with reference to FIG.

[0003] First, a gas component collection tube is connected to the Tedlar bag from which the breath of the subject has been collected, and the collected breath in the Tedlar bag is sucked out by a pump through the gas component collection tube. At the time of the suction, the collected exhaled gas passes through the gas component collection tube, and the specific component contained therein is adsorbed on the gas component collection tube.

[0004] The gas component collecting tube is a tubular member penetrating from one end to the other end, and an adsorbent (tenax, carbo trap, etc.) for adsorbing a specific component in exhaled breath is provided between the tube and the gas component collecting tube. ) Is enclosed. Then, when the exhaled air flows in the gas component collecting tube, the specific component is adsorbed by passing through the adsorbent.

[0005] Thereafter, the gas component collecting tube is set in a thermal desorption device for the gas component collecting tube.
Heated to 50 [° C]. Thereby, thermal desorption of the contained specific component adsorbed from the adsorbent of the gas component collection tube is performed.

When the gas component collecting tube is mounted on the thermal desorption device for a gas component collecting tube, one end of the gas component collecting tube is connected to a communication tube communicating with the carrier gas cylinder side, and at the same time, the other end is connected. Is connected to a communication pipe that communicates with the breath analyzer. At the time of heating, a carrier gas is supplied from one side, and the desorbed specific component is sent to the breath analyzer with the flow of the carrier gas.

FIG. 10 shows a heater 101 of the above-mentioned thermal desorption device for a gas component collecting tube. This heater 1
Reference numeral 01 denotes a collection pipe support 102 provided with an engagement groove corresponding to the gas component collection pipe K, and an opening / closing lid 103 rotatable with respect to the collection pipe support 102. . The collection tube support 102 and the opening / closing lid 103 are formed of a metal block having high thermal conductivity such as aluminum in which a heat source such as a heating wire is embedded.

FIG. 11 shows joints 104 and 105 for holding and fixing both ends of the gas component collecting pipe K when heating by the heater 101. Upper joint 10
Numeral 4 is formed in a cylindrical shape whose upper end is closed, and holds one end of the gas component collection tube K via two O-rings 104A provided inside thereof. The joint 104 is vertically movably mounted on a frame 106 indicated by a two-dot chain line. Insert one end of tube K and return to current position. Then, it is fixed by a set screw (not shown) so as not to move in the vertical direction. Code 10
Reference numeral 7 denotes a connecting pipe having one end connected to the joint 104 and the other end connected to the carrier gas cylinder.

On the other hand, the lower joint 105 includes a female member 105A having an internal thread formed on the inner surface, a male member 105B having an external thread formed on the outer peripheral portion, and a female member 105A and a male member 105B having an external thread. And a flexible fastening member 105C interposed therebetween. When the gas component collecting pipe K is mounted on the joint 105, the packing 10 provided on the inner bottom surface of the male member 105B is used.
The tightening member 105C is pressed downward by inserting the gas component collecting tube K into the 5D until the other end of the tube comes into contact with the female component 105A and screwing the female component 105A into the male component 105B. Then, the fastening member 10 pressed downwards
5C is tightened to the gas component collection tube K side by a taper formed at the inner upper end of the male member 105B, and has a structure in which the gas component collection tube K is held and the sealing property is maintained. I have. Reference numeral 108 denotes a communication pipe having one end connected to the joint 105 and the other end connected to the breath analyzer.

[0010]

However, in the conventional example described above, the gas component collecting pipe K is connected to the joint 104,
When attaching to 105, a special tool was required.

In addition to this, when attaching one end of the gas component collecting pipe K to the joint 105, the female member 105A
If the tightening is too strong, the gas component collecting pipe K will be damaged. If the tightening is too weak, the sealing property will be reduced and a leak will be generated.

Due to these reasons, the work of attaching the gas component collecting pipe K is poor in workability, and is an obstacle to rapid gas sample analysis.

[0013]

SUMMARY OF THE INVENTION An object of the present invention is to provide a thermal desorption apparatus for a gas component collection tube which improves the disadvantages of the prior art and has good workability.

[0014]

According to the present invention, there is provided a housing provided with a rotary opening / closing lid, a heater provided inside the housing for heating a gas component collecting tube, and a gas component provided near the heater. Two joints for inserting and holding the one end and the other end of the collection tube, respectively, and two connecting tubes connected to the respective joints from outside the housing and connected to the respective ends of the gas component collection tube, respectively. And a guide provided inside the housing along the longitudinal direction of the gas component collection tube connected to the joint, and a retainer which engages in a forward movement along the guide and holds one of the joints. A pressing spring for pressing one of the joints toward the other joint via the pressing member, and the pressing member is retracted to the opposite side of the pressing direction of the pressing spring in response to an operation of opening the open / close lid of the housing. The holding release member to be It has to.

In such a configuration, one connecting pipe is connected in advance to a carrier gas supply source, and the other connecting pipe is connected to an analyzer for concentrating, extracting or analyzing a specific component in the gas sample.

Next, the gas component collection tube on which the specific component of the gas sample has already been adsorbed is attached to the thermal desorption device for the gas component collection tube. When the opening / closing lid of the housing is opened during such mounting, the holding member is retracted by the holding release member against the pressing spring. As one of the joints also retreats with the holding member, the space between the two joints is widened, and in this state,
Insert the gas component collection tube into one of the joints.

When the opening / closing lid is closed, the holding member is released from the retracted state and is pressed by the pressing spring, and one of the joints is urged toward the other joint.
Each end of the gas component collecting tube is engaged with each joint while being pressed and clamped by each joint.

When the gas component collecting tube is mounted, the gas component collecting tube is heated to a predetermined temperature by the heater, and at the same time, the carrier gas is supplied through one of the connecting tubes, and the gas is removed by heating. The specific component of the separated gas sample is sent to the analyzer together with the carrier gas.

[0019]

1 to 8 show an embodiment of the present invention.
It will be described based on. In the present embodiment, a rotary opening / closing lid 2 is provided.
2, a heater 11 provided inside the housing 2 and heating the gas component collection tube K, and a heater 11
, Two joints 3 and 4 for inserting and holding one end and the other end of the gas component collection tube K near each other, and a gas component collection device connected from the outside of the housing 2 to each of the joints 3 and 4. Two connecting pipes 12 and 13 communicating with the respective ends of the pipe K, and a guide 14 provided inside the housing 2 along the longitudinal direction of the gas component collecting pipe K connected to the joints 3 and 4; A pressing member 15 which engages forward along the guide 14 and holds one joint 3, and a pressing spring 1 which presses one joint 3 toward the other joint 4 via the pressing member 15.
6, and according to the operation of opening the opening / closing lid 21 of the housing 2,
The thermal desorption device 10 for a gas component collecting pipe, which includes a connecting band 17 as a holding release member for retracting the pressing member 15 to the opposite side of the pressing direction of the pressing spring 16 between the pressing member 15 and the opening / closing lid 21 is shown. I have.

Here, the gas component collecting pipe K is a linear tubular member penetrating from one end to the other end.
An adsorbent (tenax, carbo trap, etc.) for adsorbing specific components in the breath is enclosed in the middle of the space. Then, the gas sample passes from one end to the other end, whereby a specific component contained in the gas sample is adsorbed according to the adsorbent. In addition, since both ends are inserted into the joints 3 and 4 having the O-rings 31 and 41,
As shown in FIG. 7, the edges are rounded to prevent the O-rings 31 and 41 from being damaged.

Hereinafter, each part will be described in detail. First, the housing 2
As shown in FIG. 1, a rotatable opening / closing lid 2 having a fulcrum at its upper end.
1 is a rectangular parallelepiped box with an open front surface, and the entirety including the opening / closing lid 21 is formed of a heat insulating material such as glass wool so as to prevent heat from the heater 11 provided therein. .

The opening / closing lid 21 is rotatably mounted on the upper part of the housing 2 in FIG. 1 around a horizontal direction, and one end of a connecting band 17 described later is fixed at a position separated from the pivot. Have been. The other end of the connecting band 17 is fixed to a holding member 15 described later.

Inside the housing 2, two round bar-shaped guides 14 are fixedly provided along the vertical direction in FIG. FIG. 3 is a cross-sectional view taken along the line AA in FIG. 1. As shown in FIG. 3, the two guides 14 are arranged symmetrically with respect to each other with a central portion interposed therebetween.

At the lower part of each guide 14 in FIG. 1, a heater 11 is wound around the guide 14, and the heater 11 generates heat when energized, but its wiring is not shown here.
The gas component collection pipe K is provided so as to be sandwiched between these heaters 11, but in such a case, care must be taken so that the heaters 11 do not interfere with each other.

It should be noted that a heater may be provided also on the above-mentioned opening / closing lid 21 side to heat the gas component collecting pipe K from the entire surroundings. Also, as shown in FIG.
The heat block 11A may be configured to be brought into direct contact with the gas component collection tube K to heat it. The heat block 11A is provided inside the housing 2 via a heat-resistant and heat-insulating support member. In order to increase the contact area with the gas component collection tube K, the heat block 11A is used. A round groove corresponding to the outer peripheral surface is provided.

Next, the joints 3 and 4 will be described. As shown in FIG. 5, the joints 3 and 4 are provided at one end thereof with bottomed circular holes 3A and 4A into which the gas component collecting pipe K is inserted. Two O-rings 3 are provided on the inner peripheral surfaces of the circular holes 3A and 4A to abut against the outer peripheral surface of the gas component collecting tube K to maintain the sealing property.
A ring groove for mounting 1, 41 is formed.

Each of the O-rings 31 and 41 used is made of a material having heat resistance (heat resistance capable of withstanding a desorption temperature of 150 to 350 [° C.]) and durable against wear and deterioration. , A component having no component extracted so that no ghost peak is observed. Specifically, heat-resistant silicon
Teflon or the like is used. The inner diameter is set corresponding to the outer diameter of the gas component collection tube K (a diameter somewhat smaller than the outer diameter of the gas component collection tube K). For this reason, each of the joints 3 and 4 can hold the gas component collecting tube K and sufficiently maintain the sealing property by simply inserting each end of the gas component collecting tube K, thereby preventing leakage. It is possible.

Male screw portions 3B and 4B are formed on the other end sides of the joints 3 and 4, respectively. The joint 3 is screwed to a female screw portion (not shown) provided on a holding member 15 described later. Then, it is connected to the communication pipe 12 via the pressing member 15. The joint 4 is fixed to the inner bottom surface of the housing 2 by a mounting nut 42. The mounting nut 42 also has a function of connecting the joint 4 to a communication pipe 13 described later. In addition, each male screw part 3B, 4B is set to a screw diameter corresponding to the thickness of each connecting pipe 12, 13 communicating with them.

The joints 3 and 4 are arranged on the same line along the vertical direction in FIG.
The opening sides of 4A are arranged facing each other,
Thereby, the gas component collecting pipe K formed straight by only the operation of changing the interval between the joints 3 and 4 can be obtained.
Can be mounted.

Each of the joints 3 and 4 has a connecting pipe 1
2, 13 are connected, and these are 1/16 to 1/4.
[Inch] stainless steel tubes are used. As described above, when one end of the connecting pipe 13 is connected to the joint 4 from the outside of the housing 2 by the mounting nut 42 and the one end of the joint 4 is connected to the gas component collecting pipe K, as described above, The gas component collection pipe K and the communication pipe 13 communicate with each other so that the gas flows freely. The other end of the communication tube 13 is connected to a breath analyzer and a supply source of a normal carrier gas.

On the other hand, the connecting pipe 12 is connected to the joint 3 via the holding member 15 and further communicates with the outside through the inside of a cylindrical spring holder 18 protruding from the inside to the outside of the housing 2. ing. Accordingly, when one end of the gas component collection tube K is connected to the joint 3, the gas component collection tube K and the communication tube 12 communicate with each other so that the gas can freely flow. The other end of the communication pipe 12 is usually connected to a supply source of a carrier gas or a breath analyzer.

Next, the pressing member 15 will be described.
The holding member 15 is provided with a through hole through which each of the two guides 14 described above is inserted.
4 is disposed inside the housing 2 so as to be slidable along the direction 4 and reciprocally movable in the vertical direction.

Also, as shown in FIG.
A hollow cylindrical spring holder 18 is fixedly mounted on the upper part of the spring holder.
Are arranged. The spring holder 18 is disposed inside the coil-shaped pressing spring 16 along the vertical direction, thereby preventing the pressing spring 16 from bending or twisting in the horizontal direction when the pressing spring 16 expands and contracts. The holding member 15 and the housing 2
Since the distance from the inner upper wall surface changes due to the movement of the holding member 15, the spring holding member 18 can freely move through a through hole formed in the upper wall surface of the housing 2 so as not to hinder the movement. It can be protruded. FIG. 6 is a sectional view taken along the line BB in FIG.
The communication pipe 12 is disposed inside the communication pipe.

On the other hand, both ends of the pressing spring 16 are brought into contact with the inner upper wall surface of the housing 2 and the upper surface of the pressing member 15, whereby the pressing member 15 is constantly pressed downward. Therefore, when the gas component collection tube K is mounted,
The joint 3 mounted on the lower surface side of the holding member 15 is pressed toward the gas component collection tube K, and at the same time, the gas component collection tube K
Is pressed to the joint 4 side, and the gas component collecting tube K is connected to the joint 3,
The state of connection with the gas sample 4 is effectively carried, the occurrence of leakage of the specific component of the adsorbed gas sample is prevented, and a good desorption operation can be performed.

Further, one end of a connecting band 17 is fixed to the holding member 15. The other end of the connecting band 17 is fixed to the opening / closing lid 21 of the housing 2. As the opening / closing lid 21 rotates, the holding member 15 is pulled upward against the elasticity of the pressing spring 16. It is getting to be. That is, since the other end side of the connecting band 17 is fixed at a position away from the rotation fulcrum of the opening / closing lid 21 by a fixed distance, when the opening / closing cover 21 is opened, the fixed portion with the connecting band 17 is raised upward. The holding member is also lifted up via the connecting band 17.

Therefore, the length of the connecting band 17 is at least
When the opening / closing lid 21 is in the maximum opened state, the holding member 15 is pressed until the distance between the lower end of the joint 3 and the upper end of the joint 4 becomes larger than the length of the gas component collection pipe K. It is set to be short enough to be raised. The opening / closing lid 21
Is closed between the holding member 15 and the opening / closing lid 21 as shown in FIG. 2 (B).
As the material of the connecting band 17, a ribbon-like heat-resistant Teflon material or the like is used.

FIG. 8 shows that the thermal desorption device 10 for a gas component collection tube shown in the present embodiment is connected to a gas cylinder 7 and an analyzer 8 via a six-way valve 6 so that, for example, specific components in the breath of a subject can be removed. A configuration for desorbing and analyzing a specific component from the adsorbed gas component collection tube K is shown.

Here, the six-way valve 6 has six ports 6
1, 62, 63, 64, 65, and 66, and from the state where the ports 61 and 62, the port 63 and the port 64, and the port 65 and the port 66 are communicated (FIG. 8A), the port 66 And port 61, port 62 and port 63,
It is possible to freely switch to a state where the port 64 and the port 65 (FIG. 8B) are communicated.

The analyzer 8 is connected to the port 61 and analyzes a specific component sent from the port 61. In addition, the gas cylinder 7 supplies a carrier gas that causes a gas in a pipe connecting the components to flow in a predetermined direction at a constant pressure. The gas cylinder 7 is connected to both the port 63 and the port 66 and simultaneously supplies a carrier gas.

In the thermal desorption device 10 for a gas component collection tube, the communication tubes 12 and 13 are connected to ports 65 and 62, respectively. Further, the port 64 is open to the outside, and unnecessary gas is discharged from this port.

The operation of the gas desorption tube thermal desorption device 10 connected in this manner will be described with reference to FIGS. 1, 2 and 8. FIG.

First, the gas component collection tube K, on which a specific component such as exhaled gas has been adsorbed, is connected to the gas component collection tube thermal desorption device 1.
Attach to 0. In such mounting, the opening / closing lid 21 of the housing 2
Is opened, the pressing member 15 is pulled upward by the connecting band 17 against the pressing spring 16. At this time, since one of the joints 3 is also pulled up with the pressing member 15, the interval between the joints 3 and 4 is widened. In this state, the gas component collecting tube K is sandwiched between the two heaters 11 while being held therebetween. One end is inserted into the joint 4 (the state of FIG. 1).

When the cover 21 is closed, the connecting band 1
7 is released, the pressing member 15 moves downward in accordance with the urging force of the pressing spring 16, and the one joint 3
Is pressed and urged toward the other joint 4 side, so that the other end of the gas component collection tube K is inserted into the joint 3 and each end thereof is The communication pipes 12 and 13 are brought into contact with each other (the state shown in FIG. 2).

After the gas component collecting tube K is mounted, the six-way valve 6
8A, and the carrier gas is supplied from the gas cylinder 7 through the ports 66 and 65 and the communication pipe 12. Further, at this time, the gas component collection tube K is heated to a predetermined temperature (150 to 350 [° C.]) by the heater 11, and a specific component such as exhaled air desorbed by the heating is mixed with the carrier gas in the gas component collection tube K. Is sent to the analyzer 8 through the communication pipe 13 and the ports 62 and 61, and the analysis is performed.

When the specific components are desorbed, the six-way valve 6 is switched to the state shown in FIG. 8 (B), and the ports 63 and 62 and the connecting pipe 13 are connected to the thermal desorption device 10 for the gas component collection pipe. The supply of the carrier gas is performed via the. In addition, surplus remaining specific components and the like in the gas component collection tube K are discharged through the communication tube 12 and the ports 65 and 64, and the gas component collection tube K is cleaned.

When the above steps are completed, the power supply to the heater 11 is cut off, and the gas component collecting tube K is removed from the thermal desorption device 10 for gas component collecting tubes. That is, the opening / closing lid 21 of the housing 2 is opened, and the joint 3 is pulled upward together with the holding member 15, whereby the engagement state between the joint 3 and one end of the gas component collecting pipe K is released. Then, the gas component collection pipe K is removed from the joint 4, and the entire operation is completed.

The state of connection of the analyzer 8 with the gas cylinder 7 via the ports 66 and 61 is maintained, so that the supply state of the carrier gas to the analyzer 8 is ensured. Therefore, even when the analysis is being performed by the analyzer 8, a new gas component collection tube K can be mounted on the gas component collection tube thermal desorption device 10.

As described above, this embodiment has a structure in which the joint 3 is moved away from and closer to the joint 4 via the holding member 15 in accordance with the opening and closing operation of the opening and closing cover 21 of the housing 2. At the time of separation of 3, 4 the gas component collection tube K can be easily attached and detached without a special tool.

After the gas component collecting tube K is mounted, the gas component collecting tube K is moved by the pressing spring 16 to each joint 3,
Since the holding member is clamped at a constant pressing force from 4, the occurrence of a leak of an adsorbed component or the like is effectively prevented. At this time, by selecting the pressing spring 16 having an appropriate spring constant in consideration of the strength of the gas component collection tube K, it is possible to effectively prevent the gas component collection tube from being damaged.

As described above, according to the present embodiment, the thermal desorption device for a gas component collection tube which has good workability in mounting the gas component collection tube K and promotes the speed of the gas sample analysis work is provided. It is possible to provide.

The connecting pipes 12 and 13 may be formed of a deformable tube instead of a stainless steel pipe.

Each of the joints 3 and 4 is not limited to the above-described configuration. For example, the joints 3 and 4 are set to have an outer diameter that can be inserted inside the gas component collecting pipe K and have an O-ring on the outer peripheral surface thereof. It is good also as composition which is formed by the cylindrical member provided with, and aims at connection and holding of gas component collection pipe K by inserting inside gas component collection pipe K.

The opening / closing lid 21 is provided with a claw member having an inclined surface inside the opening / closing lid 21 in a direction protruding toward the holding member 15, and the inclined surface of the claw member is set in accordance with the operation of closing the opening / closing lid 21. And may be pressed downward in accordance with the inclination of the inclined surface.

[0054]

As described above, the present invention has a structure in which each joint is connected to the gas component collecting pipe by insertion, and in addition to this, the holding member is opened and closed with the opening and closing operation of the opening and closing lid of the housing. Because one of the joints moves away from or closes to the other joint through the joint, the gas component collection tube can be easily attached and detached without a dedicated tool when the open / close lid is opened, that is, when each joint is separated. Is possible.

Further, after the gas component collecting tube is mounted, the gas component collecting tube is clamped with a constant pressing force from each joint by the pressing spring, so that the generation of the leak of the adsorbed component and the like is effectively prevented. Is done. At this time, by selecting a pressing spring having an appropriate spring constant in consideration of the strength of the gas component collecting tube, it is possible to effectively prevent the gas component collecting tube from being damaged.

As described above, according to the present invention, there is provided a thermal desorption apparatus for a gas component collection tube which has good workability in the work of attaching the gas component collection tube K and accelerates the gas sample analysis work. It is possible to

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention, FIG. 1 (A) is a front view when an opening / closing lid is opened, and FIG. 1 (B) is a side sectional view in the same state.

FIG. 2 shows the first embodiment of the present invention, FIG. 2 (A) is a front view when the opening / closing lid is closed, and FIG. 2 (B) is a side sectional view in the same state.

FIG. 3 is a cross-sectional view taken along a line AA in FIG. 1 (A).

FIG. 4 is a cross-sectional view illustrating an example of another heater.

FIG. 5 is a sectional view of a joint.

FIG. 6 is a cross-sectional view taken along line BB in FIG. 1 (A).

FIG. 7 is a partial extraction diagram showing an end of a gas component collection tube.

FIG. 8 is a block diagram showing a connection state of a thermal desorption device for a gas component collection tube with an analyzer or the like when analyzing a gas sample, and FIG. 8A shows a specific component desorption state;
(B) shows the state after desorption of the specific component.

FIG. 9 is a flowchart showing a conventional breath analysis operation.

FIG. 10 is a perspective view showing a conventional heater.

FIG. 11 is a simplified configuration diagram showing a conventional thermal desorption device for a gas component collection tube.

[Explanation of symbols]

 2 Housing 3, 4 Joint 10 Thermal desorption device for gas component collection tube 11 Heater 12, 13 Communication tube 14 Guide 15 Press member 16 Press spring 17 Connection band (holding release member) 21 Opening / closing lid K Gas component collection tube

Claims (1)

[Claims] 1. A housing provided with a rotary opening / closing lid, a heater provided inside the housing and heating a gas component collection tube, and one end of the gas component collection tube near the heater. Two joints for inserting and holding the other end, respectively, two connecting pipes connected to the respective joints from the outside of the housing and connected to the respective ends of the gas component collecting pipe, and the joints A guide provided inside the housing along the longitudinal direction of the gas component collection pipe connected to the holding member, and a holding member that engages in a forward movement along the guide and holds one of the joints And a pressing spring that presses the one joint toward the other joint via the pressing member, wherein the pressing member is moved in the pressing direction of the pressing spring in response to an operation of opening an opening / closing lid of the housing. Move the holding release member that retracts to the opposite side Pressing member and the gas component collecting pipe thermal desorption apparatus, characterized in that it comprises between the lid.