JPH0543059U - Gas analyzer - Google Patents

Abstract

(57) [Abstract] [Purpose] It is easy to attach a cell window, and it is possible to easily perform the operation of connecting and disconnecting the cell to and from the detector member. A solid filter 6 is arranged in a state of being overlapped with an optical path 2 provided in a detector member 1, a ring-shaped support packing 4 is arranged so as to overlap a peripheral edge portion of the solid filter 6, and the solid packing 6 is overlapped with the support packing 4. A cell window 7 is arranged. Then, the solid holder 6, the support packing 4, and the solid holder 6 are stacked on the peripheral portion of the cell window 7 by the cell holder 8.
The cell window 7 is pressurized and fixed to the detector member 1,
Further, the end portion of the cell 13 is inserted into the cell insertion hole 10 provided in the cell holder 8 so as to overlap the cell window 7, and a pipe arranged between the peripheral surface of the cell insertion hole 10 and the outer peripheral surface of the cell 13. The cell 13 is supported by a packing 16 in the shape of a circle.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gas analyzer for analyzing gas components such as exhaust gas and air of automobiles and the like.

[0002]

[Prior Art]

 A gas analyzer that analyzes components such as exhaust gas and the atmosphere is one in which an infrared ray such as an infrared ray emitted from a light source is incident on a detector through a cell and the component is analyzed based on the ray. For example, the gas analyzer shown in FIG. 6 is known.

In FIG. 6, reference numeral 21 denotes a sample cell, which has a flange 22 projecting from the end thereof and an outlet 23 for the sample. 24 is an O-ring arranged on the end face of the flange 22, 25 is a detector member, and the detector window 28 is adhered to the mounting step 27 formed around the end of the optical path 26 to close the optical path 26. ing. Then, a solid filter 34 is fitted adjacent to the detector window 28. 29 is a mounting plate made of metal, which is mounted on the end surface of the detector member 25 with mounting screws 30. Reference numeral 31 is a light beam passage hole provided in the mounting plate 29, and 32 is a cell window which is closed by the light passage hole 31 and adhered to the mounting plate 29 with an adhesive so that the O-ring 24 may come into contact with the surface thereof. Is formed in. Then, the flange 22 is overlaid on the mounting plate 29, which is fixed to the mounting plate 29 with mounting screws 33, and the O-ring 24 is brought into close contact with the cell window 32 to hermetically seal the end portion of the cell 21 for gas analysis. The total is configured.

[0004]

[Problems to be solved by the device]

 In the gas analyzer, it is necessary to properly clean the inner surface of the cell due to the fact that the inner surface of the cell is contaminated by the analysis of the gas. However, in the conventional gas analyzer described above, the flange 22 provided on the cell 21 is attached to the attachment plate 29 with the attachment screw 33 to connect the cell 21 and the detector member 25. Therefore, when cleaning the inner surface of the cell 21, it is necessary to separate the cell 21 from the tecdtor member 25 except for each of the mounting screws 33 to which the flanges 22 are mounted, and after the cleaning, the mounting is performed. Since it is necessary to screw the screw 33 into the screw hole (not shown) of the mounting plate 29, there is a problem that the labor required for separating and connecting the cell 21 increases. Further, since the cell window 32 is adhered to the mounting plate 29 with an adhesive, it takes time and labor, and in order to adhere the cell window 32 with an adhesive, the mounting plate 29 is formed of metal. Therefore, there is a problem that this contributes to the cost increase.

The present invention solves the above-mentioned problems, and a gas analyzer capable of easily attaching a cell window and easily connecting and disconnecting a cell to and from the detector member. The purpose is to obtain a profit.

[0006]

[Means for Solving the Problems]

 In the gas analyzer of the present invention, a ring-shaped support packing is arranged on the periphery of a solid filter placed on the end of the optical path provided on the detector member so as to be stacked, and a cell is also stacked on the support packing. A cell holder is provided with a window and is stacked on the periphery of the cell window. The solid filter, the support packing, and the cell window are pressed and fixed to the detector member, and the cell holder is provided on the cell holder so as to overlap with the cell window. The cell end is inserted into the cell insertion hole, and the cell is supported by a pipe or ring-shaped packing arranged between the peripheral surface of the cell insertion hole and the outer peripheral surface of the cell. ..

[0007]

[Action]

 In the gas analyzer of the present invention, the solid filter and the cell window are attached to the detector member by the cell holder with the ring-shaped support packing interposed therebetween, and the cell window need not be adhered. Then, the end of the cell is inserted into the cell insertion hole of the cell holder attached to the detector member with a pipe or ring-shaped packing interposed, and the support packing seals the cell insertion hole and the cell. Support the cell with a supporting packing and connect the cell to the detector member. Therefore, when it is necessary to separate the cell from the detector member for cleaning the inner peripheral surface of the cell, etc., only pull out the end of the cell from the cell insertion hole and separate the other members. Is unnecessary.

[0008]

【Example】

 A first embodiment of the gas analyzer of the present invention will be described with reference to FIGS.

In FIGS. 1 to 3, 1 is a detector member, 2 is an optical path provided in the detector member 1, 3 is a detector window which is adhered to the detector member 1 with an adhesive, and the end of the optical path 2 is closed. Is a ring-shaped support packing, and a solid filter 6 is fitted into the support packing 4 on one side of the supporting wall 5 projecting on the inner circumference of the middle portion in the thickness direction, and on the other side of the supporting wall 5. A cell window 7 is fitted in the support packing 4. The support packing 4 is arranged so as to overlap the peripheral edge portion of the detector window 3 with the solid filter 6 on the detector window 3 side.

Reference numeral 8 denotes a cell holder, which is fitted with the support packing 4 together with the solid filter 6 and the cell window 7 in a support recess 11 formed around the end portion of a cell insertion hole 10 penetrating therethrough. The side surface and the peripheral portion of the cell window 7 are supported by the bottom of the support recess 10. Then, with the support packing 4 in contact with the detector window 3, the cell holder 8 is attached to the detector member 1 with the mounting screw 9, and the support packing 4, the solid filter 6, and the cell window 7 are fixed under pressure. The support packing 4 seals the contact surface of the cell holder 8 and the contact surface with the cell window 7. Therefore, the thickness of the support packing 4 before pressing is made thicker than the depth of the support recess 11 so that the cell holder 8 can press the support packing 4. Reference numeral 12 is a sample outlet provided in the cell holder 8 in the radial direction of the cell insertion hole 10.

Reference numeral 13 denotes a sample cell, which has a hole 14 for discharging the sample formed at the end thereof and a groove 15 formed on the outer peripheral surface thereof. Reference numeral 16 denotes a pipe-shaped packing, which is attached to the cell 13 by inserting and locking the inner peripheral portion of the packing into the groove 15. Then, the packing 16 is inserted into the cell insertion hole 10 together with the end of the cell 13, and the outer peripheral surface of the packing 16 is pressed against the peripheral surface of the cell insertion hole 10 so that the space between the cell holder 8 and the cell 13 is The packing 16 seals, and the packing 16 supports the cell 13 to connect the cell 13 to the detector member 1. Reference numeral 17 is a sample flow space formed on the outer periphery of the end portion of the cell 13 and communicates with the outlet 15.

In the gas analyzer configured as described above, the sample introduced into the cell 13 as indicated by the arrow is transferred from the hole 14 provided at the end of the cell 13 to the sample flow space 17 around the outer periphery of the cell 13. It flows out and is discharged from the outlet 12. On the other hand, light rays such as infrared rays that have entered the cell 13 pass through the cell window 7, the solid filter 6 and the detector window 3 and are detected by a detector (not shown).

In this gas analyzer, the solid filter 6 and the cell window 7 are arranged on both sides of the ring-shaped support packing 4, and they are attached to the detector member 1 by the cell holder 8, and the cell window 7 It is not necessary to bond them with an adhesive. Therefore, compared to the case where the cell window is bonded with an adhesive as in the conventional gas analyzer described above, the labor required for mounting the cell window 7 is small, and the solid filter 6 and the cell window 7 can be mounted stably. Since it is possible to open the cell holder 7 and the cell window 7 does not need to be adhered, the cell holder 8 can be formed of any material such as polypropylene or other synthetic resin or metal, which can reduce the cost. It is possible. Further, a supporting wall 5 is provided so as to project on the inner circumference of the supporting packing 4, and the solid filter 6 and the cell window 7 are fitted on both sides of the supporting packing 4 to be integrally attached to the supporting packing 4. Therefore, the mounting operation of the support packing 4, the solid filter 6, and the cell window 7 by the cell holder 8 is easier.

Further, since the end of the cell 13 is inserted into the cell insertion hole 10 provided in the cell holder 8 together with the packing 16 to connect the cell 13 to the detector member 1, the connection of the cell 13 is not performed. It can be done very simply and easily. When separating the cell 13 from the detector member 1 for cleaning the inner surface of the cell 13, the cell 13 is simply pulled and pulled out together with the packing 16 from the cell insertion hole 10. Since no labor such as separation is required, the cell 13 can be attached and detached very easily, and the maintainability can be improved.

In the first embodiment, the support packing 4, the solid filter 6, and the cell window 7 are fitted in the support recess 11 provided in the cell holder 8. This is because the detector member 1 is provided with a recess, It is optional to insert it, and the support packing 4, the solid filter 6, and the cell window 7 can be supported by being sandwiched by the detector member 1 and the cell holder 8. Further, although the support packing 4 is supported in contact with the detector window 3, it may be supported in contact with the side surface of the detector member 1.

FIG. 4 shows a second embodiment. In the second embodiment, the support packing 4 is formed in a ring shape and its cross section is formed in a concave shape. Then, the solid filter 6 is fitted into the concave portion of the support packing 4, the cell window 7 is overlapped on almost the entire surface of the other side, and they are attached to the detector member 1 by the cell holder 8. The other structure is the same as that of the first embodiment, and therefore the same reference numerals are given. It is also possible to fit the cell window 7 in the concave portion of the support packing 4 and stack the solid filter 6 on the other side.

FIG. 5 shows a third embodiment. In this embodiment, the support packing 4 is formed in the shape of a flat ring, the solid filter 6 is overlaid on one side surface thereof, and the cell window 7 is overlaid on the other side surface thereof, and they are attached to the detector member 1 by the cell holder 8. There is. Then, a groove 15a is provided on the peripheral surface of the cell insertion hole 10, and the outer peripheral portion is inserted and locked in the groove 15a and attached to the cell holder 8, and the end of the cell 13 is inserted into the pipe-shaped packing 16. To connect the cell 13 to the detector member 1. The other configurations are the same as those in the first embodiment, and therefore, are denoted by the same reference numerals.

In the third embodiment, since the packing 16 is attached to the cell holder 8, the structure of the cell 13 can be simplified, and the cell 13 can be attached and detached more easily. .. As is apparent from the first and third embodiments, the packing 16 for supporting the cell 13 can be attached to either the cell holder 8 or the cell 13 and the packing of the cell holder 8 and the cell 13 can be performed. It suffices if the spaces are sealed and the cells 13 can be supported. Therefore, for example, one or a plurality of O-rings can be used as the packing 16.

[0019]

[Effect of the device]

 As described above, in the gas analyzer of the present invention, the solid filter is arranged on one side of the ring-shaped support packing, and the cell window is arranged on the other side, and they are attached to the detector member by the cell holder. It is not necessary to bond the cells with an adhesive, and the cell window can be easily and stably attached. Then, insert the end of the cell into the cell insertion hole provided in the cell holder to connect the cell to the detector member.When separating the cell for maintenance, pull it to separate it from the cell holder. However, it is not necessary to attach and detach other members. Therefore, it is possible to connect and disconnect the cells extremely easily and easily, and it is possible to easily perform maintenance such as cleaning the inner surface of the cell in a short time if necessary.

[Brief description of drawings]

FIG. 1 is a front view in which a part of a first embodiment is sectioned.

FIG. 2 is an enlarged cross-sectional view of a main part of the first embodiment.

FIG. 3 is a side view of a main part of the first embodiment.

FIG. 4 is a sectional view of an essential part of the second embodiment.

FIG. 5 is a sectional view of an essential part of the third embodiment.

FIG. 6 is a sectional view of a conventional example.

[Explanation of symbols]

1 ... Detector member, 2 ... Optical path, 4 ... Support packing, 6 ...
Solid filter, 7 ... Cell window, 8 ... Cell holder, 10 ...
Cell insertion hole, 13 ... cell, 16 ... packing.

Claims (1)

[Scope of utility model registration request] 1. A ring-shaped support packing is arranged so as to overlap with a peripheral edge portion of a solid filter arranged in a state of being overlapped with an end portion of an optical path provided on a detector member, and a cell window is arranged so as to overlap with the support packing. , A cell holder stacked on the peripheral portion of the cell window, the solid filter, the support packing, and the cell window are pressed and fixed to the detector member, and in the cell insertion hole provided in the cell holder overlapping the cell window. A gas analyzer in which an end portion of a cell is inserted and the cell is supported by a pipe or ring-shaped packing arranged between the peripheral surface of the cell insertion hole and the outer peripheral surface of the cell.