JPH0552756U - Gas chromatograph - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the number of valves that switch between the flow path for measuring gas and sample gas and the flow path for measuring flow rate, and to reduce the piping space and installation space. [Composition] An outlet channel 17 for measuring gas is provided in a manifold 15 provided facing the outer surface of an analyzer case 14.
8, an internal space 46 connecting the backflush outlet channel 19 and the sample gas outlet channels 20, 21 and one collective discharge channel 47 communicating with the internal space 46 are provided. Further, valves 50A to 50C are provided outside the measurement gas and backflush outlet flow paths 17 to 19 so as to correspond to these flow paths. The valves 50A to 50C open the outlet flow passages 17 to 19 to the internal space 46 at the time of measurement to connect with the collective discharge flow passage 47, and at the time of flow rate measurement, the outlet flow passage 1
7 to 19 are connected to the flow rate measuring device 34, and the communication with the internal space 46 is cut off.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a gas chromatograph that performs gas analysis by utilizing the difference in adsorptivity between a packing material packed as a stationary phase in a column and a measurement gas, and in particular, an improvement of a manifold constituting a connecting portion between an analyzer and an external pipe. It is about.

[0002]

[Prior Art]

 This kind of process gas chromatograph, which analyzes the components of process gas in petrochemical processes and steel processes, prepares the sample gas collected from the process line to the optimum conditions necessary for analysis by a sample conditioner device. The sample gas is supplied to the analyzer device to separate and detect each gas component, and based on the measurement results, process steps are monitored and various controls are performed. 2 and 3 show a conventional example of such a gas chromatograph. 1A, 1B are process lines, 2 is a sample conditioner device, 3 is an analyzer device, and these constitute a gas chromatograph. The sample conditioner device 2 includes a vaporizer that completely vaporizes heavy components in the sample gas SG and prevents their condensation, a filter that removes dust in the sample gas SG, the sample gas SG and the flow rate of the standard gas HG. It is composed of a rotor meter for measurement, a needle valve for adjusting the flow rates of the sample gas SG and the standard gas HG, a changeover switch (not shown) for switching the flow path, etc. There is. On the other hand, the analyzer device 3 includes the first and second columns 5, 6 connected in series, the sample valve 7, the backflush valve 8, the detector 9, the pressure reducing valve (not shown), the electric equipment section 10, and the constant temperature bath 11. , A heater 12 and the like. The constant temperature bath 11 accommodates the first and second columns 5, 6, the sample valve 7, the backflush valve 8, the detector 9 and the like, and the inside of the constant temperature bath 11 is a sample gas by the circulation of the air heated by the heater 12. The temperature is kept optimum for the SG separation analysis. The first column 5 is a packed column having an inner diameter of 1 mm to 4 mm and a length of about 0.5 to 3 m and a stationary phase filled inside, and efficiently separates low boiling point components at high speed. The second column 6 consists of a packed column with an inner diameter of 1 mm to 4 mm and a length of 0.5 to 3 m packed with a stationary phase. It is difficult to separate low boiling point components but high boiling point components are separated. On the other hand, it has a feature that it can separate at high speed and efficiently. In the analysis, the high boiling point components in the sample gas SG are discharged by the backflush valve 8 for the purpose of shortening the analysis cycle and protecting the column from deterioration, and the low boiling point components are separated at high speed by the first column 5. Then, the second column 6 separates the high boiling point component and the low boiling point component. Each gas component separated by the first and second columns 5 and 6 is converted into an electric signal by the detector 9, and this electric signal is proportional to the concentration of each gas component.

A manifold 15 is provided facing the outer surface of an analyzer case 14 that houses the constant temperature chamber 11 of the analyzer device 3, and the manifold 15 has a first outlet flow path (detector) for measuring gas. (Measurement-side outlet flow passage) 17, Second measurement gas outlet flow passage (detector comparison-side outlet flow passage) 18, Backflush outlet flow passage 19, Sample gas SG first and second outlet flow passages 20, 21 Further, an inlet channel 22 for the sample gas SG is provided, and pipes inside and outside the case are connected to the inlet channels and outlet channels in a one-to-one relationship. The measurement gas discharged from the first and second outlet channels 17 and 18 of the measurement gas, the outlet channel 19 of the backflush, and the first and second outlet channels 20 and 21 of the sample gas SG. Since the sample gas contains toxic gas, explosive gas, etc., it can be collectively discharged to a safe place. In addition, the flow rates of the measurement gas and the sample gas discharged from the first and second outlet channels 17 and 18 of the measurement gas and the outlet channel 19 of the backflush must be measured to determine the respective gas components and gas concentrations. Since it is not possible to measure accurately, two switching valves 31a, 31b, 32a, 32b, 33a, 33b provided for each of the pipes 30a to 30c are switched at the time of flow rate check to switch to the soap film flowmeter 34 or other flow rate measuring device. Conducting flow measurement.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional gas chromatograph, two switching valves 31a and 31b, 32a and 32b, 33a and 33b are used for each of the pipes 30a to 30c to switch between operation (measurement) and flow measurement. Therefore, there is a problem that the number of switching valves is large, and therefore a considerable piping space is required and the installation location is restricted.

Therefore, the present invention has been made in view of the above-described conventional problems, and an object thereof is a valve for switching between a measurement gas and sample gas vent flow path and a flow rate measurement flow path. The purpose of the present invention is to provide a gas chromatograph in which the number of pipes and installation space can be reduced.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is provided so as to face the outer surface of an analyzer case containing a sample valve, a column, a detector, etc., and is provided with a sample gas inlet channel and an outlet channel, a backflush outlet channel, and a detection channel. In a gas chromatograph equipped with a manifold forming an outlet flow path for a measurement gas from a container, an internal space connecting the sample gas outlet flow path, the back flush outlet flow path and the measurement gas outlet flow path to the manifold, and A collective discharge flow path communicating with the internal space is provided, and the outlet flow path and the internal space are opened to the outside of the measurement gas and backflush exit flow path when projecting, and the outlet flow path and the internal space when pushing. And a valve that connects the outlet flow path to the outside.

[0007]

[Action]

 In the present invention, the internal space of the manifold connects the sample gas outlet channel, the backflush outlet channel and the measurement gas outlet channel to one collective discharge channel. The valves provided on the outside of the outlet channels of the measurement gas and the backflush respectively connect the outlet channels to the internal space when projecting, connect the outlet channels to the outside when pushing, and disconnect the communication with the internal space. ..

[0008]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 is a sectional view of an essential part showing an embodiment of a gas chromatograph according to the present invention. The same components as those in FIGS. 2 and 3 are designated by the same reference numerals. In the figure, the manifold 15 mounted to the analyzer case 14 has a main body 42 having a recess 40 in the center of the back surface, fitted and fixed in the mounting hole 41 of the analyzer case 14, and the front surface protruding outside the case. And a back cover 45 fitted to the recess 40 and closely fixed to the back surface of the main body 42 via an O-ring 43, and a back cover 45 fixed by a plurality of bolts 44. An internal space 46 is formed.

An inlet passage 22 for the sample gas SG is formed in the lower part of the main body 42 so as to penetrate the front and back surfaces, and a front opening 22a is connected to the sample conditioner device 2 shown in FIG. The opening 22b is connected to the sample valve 7 by piping. Further, a collective discharge flow path 47 communicating with the internal space 46 is formed in the main body 42, and the collective discharge flow path 47 is connected to a safe place by piping.

The back cover 45 has a first outlet passage (detector measurement side outlet passage) 17 for measurement gas, a second outlet passage (detector comparison side outlet passage) 18 for measurement gas, and a back flush. The outlet flow passage 19 and the first and second outlet flow passages 20 and 21 of the sample gas SG are formed so as to communicate with the internal space 46, respectively. Further, the main body 42 has three valves 50 (50A to 50C) having the same structure in the first outlet passage 17 of the measurement gas, the second outlet passage 18 of the measurement gas, and the outlet passage 19 of the backflush. Correspondingly installed respectively. The valve 50A opens the first outlet flow path 17 to the internal space 46 at the time of operation (measurement) to communicate with the collective discharge flow path 47, disconnects the communication with the internal space 46 at the time of measuring the flow rate, and the soap film flow meter 34 And the like, each of which is connected to a flow rate measuring device such as the above, and includes a valve body 53 screwed into a screw hole 52 formed in the body 42. The screw hole 52 is formed on the front surface side of the main body 42 to an intermediate thickness, and the inner end communicates with the internal space 46 by a straight hole 54 having a smaller diameter. The valve body 53 is formed of a tubular body with both ends open, a male screw portion 55 that is screwed into the screw hole 52 is provided in an intermediate portion of the outer peripheral surface, and an inner end portion of the valve body 53 slides in the straight hole 54 through an O ring. A ball 58, which is movably fitted therein and serves as a valve body that opens and closes the first outlet channel 17, and an inner opening of the valve body 53 that urges the ball 58 toward the first outlet channel 17 A compression coil spring 61 is arranged in pressure contact with a taper portion 60 provided on the inner surface of the portion 59. A pin 63 is inserted into the inner opening 59 on the peripheral surface of the ball 58 on the side opposite to the compression coil spring 61, and projects into the internal space 46 when the ball 58 is pressed against the taper portion 60. Are projected integrally.

In this case, the valve 50A shows a flow rate measurement state, that is, a state in which the valve 50A is pushed into the inner side of the screw hole 52 (pushed state). As a result of being closely contacted with each other, the communication between the first outlet flow path 17 and the internal space 46 is cut off, while the pin 63 abuts the back cover 45 and the ball 58 resists the compression coil spring 61 to the right in FIG. By moving, the inner opening 59 is opened and the first outlet flow path 17 is connected to the soap film flow meter 34. On the other hand, during measurement of the sample gas SG, the valve body 53 is projected outward to the positions of the valves 50B and 50C, thereby opening the first outlet flow path 17 into the internal space 46, and the ball 58 is compressed by the compression coil. By being pressed against the taper portion 60 by the spring force of the spring 61, the inner opening portion 59 is closed, and the communication between the first outlet flow path 17 and the soap film flow meter 34 is cut off. Since the valves 50B and 50C have the same structure as the valve 50A, the description thereof will be omitted. 66 is a dustproof and moistureproof cap.

Thus, in the gas chromatograph having such a configuration, the first and second outlet flow passages 17 and 18 of the measurement gas, the back flush outlet flow passage 19 and the sample gas SG are provided in the manifold 15. An internal space 46 that commonly connects the first and second outlet flow passages 20 and 21 and one combined discharge flow passage 47 is provided, and the first and second outlet flow passages 17 and 18 and the backflush outlet are provided. Valves 50A to 50C are provided corresponding to the flow paths 19, and the valves 50A to 50C are projected to the outside of the manifold 15 at the time of measuring the sample gas SG so that the first and second outlet flow paths 17 and 18 and the backflush. The outlet flow path 19 is opened to the internal space 46 to communicate with the collective discharge flow path 47, and the valves 50A to 50C are pushed into the manifold 15 at the time of measuring the flow rate. The first and second outlet channels 17 and 18, the back flush outlet channel 19 and the internal space 46 are disconnected from each other, and the first and second outlet channels 17 and 18 and the back flush outlet channel 19 are soaped. Since they are connected to the membrane flowmeters 34, respectively, unlike the conventional device, two valves for one system are not required, and it is possible to reduce the number of valves and the piping space.

[0013]

[Effect of the device]

 As described above, according to the gas chromatograph according to the present invention, one valve can be provided for switching between the vent side flow path of the measurement gas and the sample gas and the flow rate measurement side flow path. The number is small, the space for installing the piping space and gas chromatograph can be reduced, and the operability during flow rate measurement can be improved. ..

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of a gas chromatograph according to the present invention.

FIG. 2 is a front view showing a conventional example of a gas chromatograph.

FIG. 3 is a sectional view of a manifold.

[Explanation of symbols]

 2 sample conditioner device 3 analyzer device 5 first column 6 second column 7 sample valve 8 backflush valve 9 detector 11 constant temperature bath 14 analyzer case 15 manifold 17 first outlet channel for measurement gas 18 first for measurement gas 2 outlet channel 19 backflush outlet channel 20 first sample gas outlet channel 21 sample gas second outlet channel 22 sample gas inlet channel 46 internal space 47 collective discharge channel 50A-50C valve

Claims (1)

[Scope of utility model registration request] 1. A sample gas inlet channel and outlet channel, a backflush outlet channel, a measurement gas from a detector, which is provided so as to face the outer surface of an analyzer case containing a sample valve, a column, a detector and the like. In a gas chromatograph provided with a manifold having an outlet channel formed therein, an internal space that connects the sample gas outlet channel, the backflush outlet channel, and the measurement gas outlet channel to the manifold, and a set that communicates with this internal space. Provided with an exhaust flow path, outside the measurement gas and back flush exit flow path,
A gas chromatograph, characterized in that the outlet channel and the internal space are opened when protruding, the outlet channel and the internal space are closed when pushed, and valves for communicating the outlet channel with the outside are provided respectively.