CN214845035U - Gas chromatograph for polypropylene analysis - Google Patents
Gas chromatograph for polypropylene analysis Download PDFInfo
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- CN214845035U CN214845035U CN202120077133.4U CN202120077133U CN214845035U CN 214845035 U CN214845035 U CN 214845035U CN 202120077133 U CN202120077133 U CN 202120077133U CN 214845035 U CN214845035 U CN 214845035U
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Abstract
The utility model discloses a gas chromatograph for polypropylene analysis, it includes: a detector; a rotameter; a gas source; a standby air source; the switching mechanism comprises an air cylinder, a stop block and a rope body. The utility model discloses can be under the unable normal gaseous condition of carrying of air supply, the reserve air supply of automatic switch-over continues to carry gas by reserve air supply, avoids leading to the fact certain degree thermal damage to column system because of the sudden drop of air flow, can guarantee the stability of the air current state of gas chromatograph in the use, the safe and reliable that improve equipment used, extension equipment life.
Description
Technical Field
The utility model relates to a detecting instrument technical field. More specifically, the utility model relates to a gas chromatograph is used in polypropylene analysis.
Background
The polypropylene is a thermoplastic resin, is mostly prepared by propylene polymerization, is widely applied to the fields of household appliances, automobiles, building materials, chemical engineering, agriculture and the like, and needs to be analyzed in the production process of the polypropylene, so that the accurate control of the quality standard of the polypropylene is realized, and the quality and the production safety of the polypropylene product are ensured.
A commonly used analyzer for polypropylene analysis is gas chromatography, which carries a vaporized analytical sample into a chromatographic column with a carrier gas to detect the components in the sample. The air supply of current gas chromatograph is only one, and when single air supply resulted in unable normal transport gas because of the tolerance is not enough or the outage, can make the inside heat of gas chromatograph can't be taken away by the carrier gas, and the heat of gathering in the twinkling of an eye can lead to the fact certain thermal damage to the chromatographic column, and then influences gas chromatograph's life.
SUMMERY OF THE UTILITY MODEL
It is an object of the present invention to solve at least the above problems and to provide at least the advantages which will be described later.
The utility model discloses it is still another purpose to provide a gas chromatograph for polypropylene analysis, but its automatic switch over reserve air supply avoids the single air supply not enough to arouse the heat to gather and cause certain degree heat damage to the chromatographic column, can guarantee the stability of gas chromatograph at the air current state in the use, and the safe and reliable that improve equipment used prolongs equipment life.
To achieve these objects and other advantages in accordance with the present invention, there is provided a gas chromatograph for polypropylene analysis, comprising:
the bottom of one side of the detector is connected with one end of the column system, and the top of the detector is connected with the air inlet of the waste gas processor;
the gas outlet end of the rotor flowmeter is connected with the other end of the column system, and a sample injection mechanism is arranged between the rotor flowmeter and the column system;
the gas source is communicated with the gas inlet end of the rotor flow meter through a first gas pipeline; a first air valve is arranged at one end of the first air pipeline close to the air source;
the standby gas source is communicated with the middle part of the first gas pipeline through a second gas pipeline which is vertically arranged; a second air valve is arranged at one end of the second air pipeline, which is close to the standby air source, and the other end of the second air pipeline, which is far away from the standby air source, is communicated with the middle part of the first air pipeline through a tee joint;
a switching mechanism, comprising:
the air cylinder is vertically arranged on the first gas pipeline, two ends of the air cylinder are communicated with the interior of the first gas pipeline, the air cylinder is positioned between the first gas valve and the second gas pipeline, and a floating ball is arranged in the air cylinder in a floating mode;
the baffle block is of a cylindrical structure arranged inside the second gas pipeline, the circumferential side wall of the baffle block is fixedly connected with the inner wall of the second gas pipeline in a sealing way, and the middle part of the baffle block is provided with a gas guide hole which is coaxial with the baffle block and has a circular truncated cone structure with a large upper part and a small lower part;
the piston is of a circular truncated cone structure which is coaxially arranged in the second gas pipeline and is large in upper part and small in lower part and is positioned at the upper part of the stop block, and the bottom of the piston can plug the bottom of the gas guide hole;
and the rope body is arranged in the first gas pipeline, one end of the rope body is fixedly connected with the top of the floating ball, and the other end of the rope body penetrates through the tee joint to enter the second gas pipeline and is fixedly connected with the top of the piston.
Preferably, the gas chromatograph for polypropylene analysis, the switching mechanism further includes a spring vertically disposed inside the second gas conduit and located above the piston, a lower end of the spring is fixedly connected to a top of the piston, and an upper end of the spring is fixedly connected to an inner wall of the second gas conduit.
Preferably, the gas chromatograph for polypropylene analysis is provided with a fixed pulley at the bend of the first gas pipeline and at the bend of the tee joint, and the other end of the rope enters the second gas pipeline through the two fixed pulleys and is fixedly connected with the top of the piston.
Preferably, the first gas pipeline is provided with a one-way valve, and the one-way valve is positioned between the gas storage cylinder and the tee joint.
Preferably, the gas chromatograph for polypropylene analysis, the second gas pipeline comprises:
the lower end of the first part is communicated with the standby air source, and a second air valve is arranged on the first part;
the upper end of the second part is communicated with the tee joint in a sealing mode through a sleeve, and two ends of the sleeve are connected with the tee joint and the second part in a sealing mode through threads; the stop, the piston and the spring are all located within the second portion;
a third portion vertically positioned between the first portion and the second portion, the third portion sealingly communicating a lower end of the second portion with an upper end of the first portion, the third portion being a collapsible bellows.
Preferably, the gas chromatograph for polypropylene analysis further comprises an alarm mechanism, wherein the alarm mechanism comprises a flow detector, a controller and an alarm, the flow detector is communicated with the first gas pipeline, and the communication position of the flow detector and the first gas pipeline is located between the first gas valve and the gas storage cylinder; the controller is connected with the flow detector and the alarm.
The utility model discloses at least, include following beneficial effect: the utility model discloses can be under the unable normal gaseous condition of carrying of air supply, the reserve air supply of automatic switch-over continues to carry gas by reserve air supply, avoids causing certain degree of thermal damage to column system because of the sudden drop of airflow, can guarantee the stability of gas chromatograph at the air current state in the use, safe and reliable that improve equipment used, extension equipment life
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a gas chromatograph for polypropylene analysis according to an embodiment of the present invention in a state of sufficient gas supply;
FIG. 2 is an enlarged view of a portion of FIG. 1;
fig. 3 is a schematic structural diagram of a gas chromatograph for polypropylene analysis according to another embodiment of the present invention in a state of switching to a standby gas supply;
fig. 4 is a partially enlarged view of B in fig. 3.
Description of reference numerals: 1-detector 2-column system 3-exhaust gas processor 4-rotameter 5-sample introduction mechanism 6-gas source 61-first gas pipeline 62-first gas valve 7-backup gas source 71-second gas pipeline 72-second gas valve 81-gas storage cylinder 82-floating ball 83-block 84-gas guide hole 85-piston 86-rope 87-spring 9-one-way valve 711-first part 712-second part 713-third part 721-sleeve.
Detailed Description
The present invention is further described in detail below with reference to the drawings and examples so that those skilled in the art can implement the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
In the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
As shown in fig. 1-4, the utility model provides a gas chromatograph for polypropylene analysis, it includes:
a detector 1, one side of which is connected with one end of the column system 2 at the bottom and connected with the air inlet of the waste gas processor 3 at the top; the sample is separated by the column system 2 and then enters the detector 1 for detection and analysis, finally the carrier gas carries part of heat and the rest of the sample to enter the waste gas processor 3, the waste processor can purify the carrier gas to be discharged, and the pollution-free gas after treatment is finally discharged from the gas outlet of the waste gas processor 3;
the gas outlet end of the rotor flow meter 4 is connected with the other end of the column system 2, and a sample injection mechanism 5 is arranged between the rotor flow meter 4 and the column system 2; the sample introduction mechanism 5 comprises a sample introduction port and a gasification chamber, and the sample introduction port is provided with a one-way flow device which can prevent the vacant sample introduction port from adversely affecting the sample detection due to the air tightness.
A gas source 6 which is communicated with the gas inlet end of the rotor flow meter 4 through a first gas pipeline 61; a first air valve 62 is arranged at one end of the first air pipeline 61 close to the air source 6;
a standby gas source 7 which is communicated with the middle part of the first gas pipeline 61 through a second gas pipeline 71 which is vertically arranged; a second air valve 72 is arranged at one end of the second air pipeline 71 close to the standby air source 7, and the other end far away from the standby air source 7 is communicated with the middle part of the first air pipeline 61 through a tee joint; the second gas conduit 71 is indirectly in communication with the rotameter 4; the gas source 6 and the standby gas source 7 can be provided with corresponding pressure reducing valves, speed regulating valves and barometers by the prior art so as to master the pressure of carrier gas in real time and adjust the pressure of the carrier gas in time;
a switching mechanism, comprising:
the air storage cylinder 81 is vertically arranged on the first gas pipeline 61, two ends of the air storage cylinder 81 are communicated with the interior of the first gas pipeline 61, the air storage cylinder 81 is positioned between the first gas valve 62 and the second gas pipeline 71, and a floating ball 82 is arranged in the air storage cylinder 81 in a floating mode;
the stopper 83 is of a cylindrical structure arranged inside the second gas pipeline 71, the circumferential side wall of the stopper 83 is fixedly connected with the inner wall of the second gas pipeline 71 in a sealing manner, and the middle part of the stopper 83 is provided with a gas guide hole 84 which is coaxial with the stopper 83 and has a circular truncated cone structure with a large upper part and a small lower part;
a piston 85 having a circular truncated cone structure with a large top and a small bottom coaxially disposed in the second gas duct 71 and located above the stopper 83, wherein the bottom of the piston 85 is capable of sealing the bottom of the gas vent 84;
and the rope body 86 is arranged in the first gas pipeline 61, one end of the rope body 86 is fixedly connected with the top of the floating ball 82, and the other end of the rope body 86 penetrates through the tee joint to enter the second gas pipeline 71 and is fixedly connected with the top of the piston 85.
In the technical scheme, the utility model discloses can be under the unable normal gaseous circumstances of transport of air supply 6, automatic switch-over reserve air supply 7 continues to carry gas by reserve air supply 7, avoids leading to the fact the thermal damage of certain degree to column system 2 because of the abrupt reduction of gas flow, can guarantee the stability of gas chromatograph at the air current state in the use, improve the safe and reliable that equipment used, extension equipment life.
Specifically, the method comprises the following steps: in practice, the first air valve 62 and the second air valve 72 are sequentially opened, the carrier gas pressure is adjusted according to the experiment requirement, the opening degrees of the first air valve 62 and the second air valve 72 are the same, namely, the air pressure gauge values on the air source 6 and the standby air source 7 are the same; at this time, the floating ball 82 floats upwards in the air storage cylinder 81 under the action of air, the air source 6 delivers air to apply downward pressure to the piston 85, the standby air source 7 delivers air to apply upward thrust to the piston 85, when the air source 6 is sufficient and supplies air normally (as shown in fig. 1-2), the piston 85 is just plugged in the air guide hole 84, the bottom of the air guide hole 84 is plugged by the bottom of the piston 85, at this time, the air is supplied by the air source 6, and the standby air source 7 does not supply air; when the gas delivered by the gas source 6 is smaller than the original set value (as shown in fig. 3-4) due to insufficient gas in the gas storage tank or power failure, the pressure of the gas delivered by the gas source 6 on the piston 85 is reduced, the upward thrust of the standby gas source 7 on the piston 85 is unchanged, and meanwhile, the gas delivered by the gas source 6 is reduced, the floating ball 82 moves downwards to drive the rope body 86 to move, so that the upward pulling force on the piston 85 is generated, finally, the piston 85 moves upwards relative to the gas guide hole 84, the gas guide hole 84 is opened, and the standby gas source 7 can deliver gas to the rotameter 4, so that the stability of carrier gas is ensured, and the automatic switching of the standby gas source 7 is realized;
in another technical solution, the gas chromatograph for polypropylene analysis, the switching mechanism further includes a spring 87 vertically disposed inside the second gas pipeline 71 and above the piston 85, a lower end of the spring 87 is fixedly connected to a top of the piston 85, and an upper end of the spring is fixedly connected to an inner wall of the second gas pipeline 71. The spring 87 is a compression spring 87, when the air source 6 supplies air normally, the piston 85 is just positioned in the air guide hole 84 and seals the bottom of the air guide hole 84 under the combined action of the air pressure output by the air source 6 and the pressure of the spring 87, and the movement controllability of the piston 85 similar to the spring 87 is better. Specifically, an annular limiting plate may be horizontally and fixedly disposed in the second gas pipeline 71, and is located above the spring 87, and an upper end of the spring 87 extends vertically upward and is fixedly connected to the limiting plate.
In another technical solution, in the gas chromatograph for polypropylene analysis, a fixed pulley is disposed at each of the curve of the first gas pipeline 61 and the curve of the tee joint, and the other end of the rope 86 enters the second gas pipeline 71 through the two fixed pulleys and is fixedly connected to the top of the piston 85. The fixed pulley ensures the smoothness of the movement of the rope body 86.
In another technical solution, in the gas chromatograph for polypropylene analysis, the first gas pipe 61 is provided with a check valve 9, which is located between the gas cylinder 81 and the tee joint. Due to the existence of the check valve 9, when the standby gas source 7 is switched, the gas delivered by the standby gas source 7 can only flow into the rotameter 4 through the second gas pipeline 71 and the first gas pipeline 61, so that the gas is prevented from being shunted due to the reverse flow of part of the gas.
In another embodiment, the second gas pipeline 71 includes:
the lower end of the first part 711 is communicated with the standby air source 7, and a second air valve 72 is arranged on the first part 711;
the upper end of the second part 712 is in sealed communication with the tee joint through a sleeve 721, and two ends of the sleeve 721 are in sealed connection with the tee joint and the second part 712 through threads; the stop 83, the piston 85 and the spring 87 are all located within the second portion 712;
a third part 713 vertically positioned between the first part 711 and the second part 712, the third part 713 sealingly communicating a lower end of the second part 712 with an upper end of the first part 711, the third part 713 being a telescopic bellows.
In the actual analysis and detection process, the carrier gas pressures are different, the floating heights of the floating balls 82 are different due to the different pressures, and the relative heights of the second part 712 are adjusted according to the different carrier gas pressures (actually, the heights of the stop block 83 and the piston 85 are adjusted), so that when the first air valve 62 and the second air valve 72 are opened and the air supply of the air source 6 is normal, the floating balls 82 float upwards, the piston 85 is blocked in the air guide hole 84, the rope 86 is in a state of being just tensioned, and the spare air source 7 can be automatically switched to only when the air supply of the air source 6 is insufficient under the condition of different experimental carrier gas pressures;
the specific adjusting method comprises the following steps: when the carrier gas pressure is low, the floating ball 82 has a small upward floating height, the sleeve 721 is rotated in the first direction, the upper end of the second part 712 of the second gas pipeline 71 moves upward relative to the sleeve 721, and the third part 713 of the bellows material is stretched upward to compensate for the height difference between the second part 712 and the inner part of the sleeve 721; when the carrier gas pressure is higher, the floating ball 82 floats upwards to a greater height, the sleeve 721 is rotated in a second direction (opposite to the first direction), the upper end of the second part 712 of the second gas pipeline 71 moves downwards relative to the sleeve 721, and the third part 713 of the bellows material is compressed downwards to compensate for the height difference of the second part 712 moving out of the sleeve 721;
different marking lines can be arranged on the circumferential outer wall of the second part 712, the marking line corresponding to the edge of the lower end of the sleeve 721 is determined according to multiple tests under different experimental carrier gas pressures, the corresponding carrier gas pressure is written at the position of the marking line, and before experimental analysis, the sleeve 721 is rotated to the corresponding marking line, so that the heights of the piston 85 and the stop block 83 are adjusted.
In another technical solution, the gas chromatograph for polypropylene analysis further comprises an alarm mechanism, which includes a flow detector 1, a controller and an alarm, the flow detector 1 is communicated with the first gas pipeline 61, the communication position of the flow detector 1 and the first gas pipeline 61 is located between the first gas valve 62 and the gas storage cylinder 81, and the flow detector 1 is used for detecting the gas flow of the first gas pipeline 61 in the area between the first gas valve 62 and the gas storage cylinder 81; the controller is connected with the flow detector 1 and the alarm. Timely inform the inspector that the gas source 6 is insufficient through the alarm mechanism, the inspector timely checks the reason of the insufficient gas, if the gas in the gas tank of the gas source 6 is exhausted, the gas tank full of gas is replaced.
The number of apparatuses and the scale of the process described here are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.
While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.
Claims (6)
1. A gas chromatograph for polypropylene analysis, comprising:
the bottom of one side of the detector is connected with one end of the column system, and the top of the detector is connected with the air inlet of the waste gas processor;
the gas outlet end of the rotor flowmeter is connected with the other end of the column system, and a sample injection mechanism is arranged between the rotor flowmeter and the column system;
the gas source is communicated with the gas inlet end of the rotor flow meter through a first gas pipeline; a first air valve is arranged at one end of the first air pipeline close to the air source;
the standby gas source is communicated with the middle part of the first gas pipeline through a second gas pipeline which is vertically arranged; a second air valve is arranged at one end of the second air pipeline, which is close to the standby air source, and the other end of the second air pipeline, which is far away from the standby air source, is communicated with the middle part of the first air pipeline through a tee joint;
a switching mechanism, comprising:
the air cylinder is vertically arranged on the first gas pipeline, two ends of the air cylinder are communicated with the interior of the first gas pipeline, the air cylinder is positioned between the first gas valve and the second gas pipeline, and a floating ball is arranged in the air cylinder in a floating mode;
the baffle block is of a cylindrical structure arranged inside the second gas pipeline, the circumferential side wall of the baffle block is fixedly connected with the inner wall of the second gas pipeline in a sealing way, and the middle part of the baffle block is provided with a gas guide hole which is coaxial with the baffle block and has a circular truncated cone structure with a large upper part and a small lower part;
the piston is of a circular truncated cone structure which is coaxially arranged in the second gas pipeline and is large in upper part and small in lower part and is positioned at the upper part of the stop block, and the bottom of the piston can plug the bottom of the gas guide hole;
and the rope body is arranged in the first gas pipeline, one end of the rope body is fixedly connected with the top of the floating ball, and the other end of the rope body penetrates through the tee joint to enter the second gas pipeline and is fixedly connected with the top of the piston.
2. The gas chromatograph for polypropylene analysis according to claim 1, wherein the switching mechanism further comprises a spring vertically disposed inside the second gas conduit and above the piston, wherein a lower end of the spring is fixed to a top of the piston, and an upper end of the spring is fixed to an inner wall of the second gas conduit.
3. The gas chromatograph for polypropylene analysis according to claim 2, wherein a fixed pulley is provided at each of a bend of the first gas conduit and a bend of the tee, and the other end of the rope enters the second gas conduit via the two fixed pulleys and is fixed to the top of the piston.
4. The gas chromatograph for polypropylene analysis according to claim 3, wherein a check valve is provided on the first gas line between the gas cylinder and the tee.
5. The gas chromatograph for polypropylene analysis of claim 4, wherein the second gas conduit comprises:
the lower end of the first part is communicated with the standby air source, and a second air valve is arranged on the first part;
the upper end of the second part is communicated with the tee joint in a sealing mode through a sleeve, and two ends of the sleeve are connected with the tee joint and the second part in a sealing mode through threads; the stop, the piston and the spring are all located within the second portion;
a third portion vertically positioned between the first portion and the second portion, the third portion sealingly communicating a lower end of the second portion with an upper end of the first portion, the third portion being a collapsible bellows.
6. The gas chromatograph for polypropylene analysis according to claim 5, further comprising an alarm mechanism including a flow detector, a controller and an alarm in communication with the first gas conduit, wherein the communication of the flow detector with the first gas conduit is between the first gas valve and the gas cylinder; the controller is connected with the flow detector and the alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120077133.4U CN214845035U (en) | 2021-01-11 | 2021-01-11 | Gas chromatograph for polypropylene analysis |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120077133.4U CN214845035U (en) | 2021-01-11 | 2021-01-11 | Gas chromatograph for polypropylene analysis |
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| CN214845035U true CN214845035U (en) | 2021-11-23 |
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| CN202120077133.4U Active CN214845035U (en) | 2021-01-11 | 2021-01-11 | Gas chromatograph for polypropylene analysis |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115656443A (en) * | 2022-11-10 | 2023-01-31 | 北京市市政工程研究院 | Tunnel construction monitoring facilities |
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2021
- 2021-01-11 CN CN202120077133.4U patent/CN214845035U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115656443A (en) * | 2022-11-10 | 2023-01-31 | 北京市市政工程研究院 | Tunnel construction monitoring facilities |
| CN115656443B (en) * | 2022-11-10 | 2023-05-02 | 北京市市政工程研究院 | Tunnel construction monitoring facilities |
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