CN111272489A - Closed automatic sampling system and method - Google Patents
Closed automatic sampling system and method Download PDFInfo
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- CN111272489A CN111272489A CN202010260373.8A CN202010260373A CN111272489A CN 111272489 A CN111272489 A CN 111272489A CN 202010260373 A CN202010260373 A CN 202010260373A CN 111272489 A CN111272489 A CN 111272489A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
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Abstract
The invention relates to a closed automatic sampling system and a method. Comprises a cylinder piston cavity, a cylinder sealing cavity, a cylinder sampling cavity and a sampling valve core; the cylinder body piston cavity is provided with a first pressure air source inlet, the cylinder body sealing cavity is provided with a second pressure air source inlet, the cylinder body sampling cavity is provided with a purging air source inlet and a medium outlet, one end of the sampling valve core is provided with a piston, and the other end of the sampling valve core is provided with a sampling groove; the sampling valve core is hermetically arranged in the closed cavity, and the sampling valve core piston is positioned in the cylinder body piston cavity; the first pressure gas source inlet and the second pressure gas source inlet are respectively connected with a pressure gas source, the purging gas source inlet is connected with a purging gas source, and the medium outlet is connected with the sampling bottle. The invention realizes automatic sampling in a closed state; and the sampling bottle is convenient to assemble and disassemble, and the leakage at the joint is avoided.
Description
Technical Field
The invention relates to the technical field of sampling of various toxic, harmful, inflammable and explosive media in the petrochemical industry, in particular to a closed automatic sampling system and a closed automatic sampling method.
Background
In petrochemical production, various toxic, harmful, inflammable and explosive media need to be frequently sampled. Ethylene is the core of the whole petrochemical industry and plays an unmovable role in national economy of a country, the development of the ethylene industry is taken as one of important marks for measuring the development level of the national petrochemical industry in the world, and a sampling system used by an ethylene device is sampling heart equipment, is the key of quality detection and has a very important role in the petrochemical industry.
However, the sampling device for toxic, harmful, inflammable and explosive media, particularly ethylene, in the petrochemical production is generally not tightly sealed at present, automatic sampling cannot be realized, and the problems of inconvenience in assembling and disassembling the sampling bottle and leakage at a joint cannot be well solved.
Disclosure of Invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a closed automatic sampling system and method. Automatic sampling under a closed state is realized; and the sampling bottle is convenient to assemble and disassemble, and the leakage at the joint is avoided.
In order to achieve the purpose, the invention adopts the following technical scheme:
a closed automatic sampling system comprises a cylinder piston cavity, a cylinder sealing cavity, a cylinder sampling cavity and a sampling valve core; the cylinder body piston cavity is provided with a first pressure air source inlet, the cylinder body sealing cavity is provided with a second pressure air source inlet, the cylinder body sampling cavity is provided with a purging air source inlet and a medium outlet, one end of the sampling valve core is provided with a piston, and the other end of the sampling valve core is provided with a sampling groove; the sampling valve core is hermetically arranged in the closed cavity, and the sampling valve core piston is positioned in the cylinder body piston cavity; the first pressure gas source inlet and the second pressure gas source inlet are respectively connected with a pressure gas source, the purging gas source inlet is connected with a purging gas source, and the medium outlet is connected with the sampling bottle.
The three pneumatic quick connectors are fixedly connected to the first pressure gas source inlet, the second pressure gas source inlet and the purging gas source inlet respectively, and the connection modes are threaded screwing sealing; the first pressure air source inlet, the second pressure air source inlet and the purging air source inlet are respectively connected with respective air sources through pneumatic quick connectors.
The device also comprises an open-close type quick joint; the open-close type quick connector comprises a quick-open female head and a quick-open male head, wherein the quick-open female head and the quick-open male head are both provided with a counter-acting valve core and a return spring, the quick-open female head is provided with a protective gas outlet and a sealing groove, the quick-open female head is connected with a medium outlet, and the quick-open male head is connected with a sampling bottle; after the quick-opening male head is inserted into the quick-opening female head, the contact surface is sealed by a sealing ring, the two opposite-top valve cores interact with each other, and the quick-opening male head is communicated with the inner cavity of the quick-opening female head; after the quick-opening male head leaves the quick-opening female head, the opposite valve core resets under the action of the reset spring, and the quick-opening male head and the quick-opening female head are respectively closed.
A first pressure air source inlet is formed in one end face of the cylinder piston cavity and is a through hole, a buffer mechanism is arranged at the first pressure air source inlet in the cylinder piston cavity, and a sealing groove is formed in the other end face of the cylinder piston cavity.
And a second pressure air source inlet is formed in the side wall of the cylinder body sealing cavity, the second pressure air source inlet is communicated with one end face of the cylinder body sealing cavity through a communicating hole, and the inner wall and the two end faces are provided with sealing grooves.
A purging gas source inlet and a medium outlet are arranged on the side wall of the cylinder body sampling cavity, the purging gas source inlet and the medium outlet are both through holes, and the purging gas source inlet and the medium outlet are both provided with process chamfers; one end face of the cylinder body sampling cavity is provided with a sealing groove, the other end face of the cylinder body sampling cavity is provided with a process chamfer, and the inner wall of the cylinder body sampling cavity is provided with a sealing groove.
The sampling valve core comprises a piston, a connecting rod and a sampling rod; the connecting rod and the sampling rod are integrated, and the connecting rod is connected with the piston through threads; the side wall of the piston is provided with a sealing groove, and the sampling rod is provided with a sealing groove, a guide groove and a sampling groove.
The sampling valve core piston is sealed with the inner wall of the cylinder piston cavity through a sealing ring, the connecting rod is sealed with the inner wall of the cylinder sealing cavity through the sealing ring, and the sampling rod is sealed with the inner wall of the cylinder sampling cavity through the sealing ring.
The end surface of the piston cavity of the cylinder body is tightly pressed and sealed with the end surface of the sealing cavity of the cylinder body through a sealing ring; the sealed chamber of cylinder body cramps through the clamp joint with the cylinder body sample chamber, and the sealed chamber terminal surface of cylinder body passes through sealing washer and the tight seal of cylinder body sample chamber terminal surface pressure.
A sealed automatic sampling method comprises the following steps:
step one, a first pressure air source inlet is connected with a first pressure air source through a pneumatic quick connector, a second pressure air source inlet is connected with a second pressure air source through a pneumatic quick connector, a purging air source inlet is connected with a purging air source through a pneumatic quick connector, and a medium outlet is connected with a sampling bottle through an opening-closing type quick connector;
secondly, introducing purge gas through a purge gas source inlet to perform purge;
introducing pressure gas through the first pressure gas source inlet, enabling the pressure gas to flow through the cylinder piston cavity to push the left end face of the piston to drive the sampling valve core to move towards the right side, pushing the gas in the cavity to be discharged after flowing to the second pressure gas source inlet through the communicating hole, and enabling the sampling rod of the sampling valve core to extend out of the device to enter a sampling medium, wherein the medium flows into the sampling groove from the sampling groove opening;
after the medium flows into the sampling groove, introducing pressure gas through a second pressure gas source inlet, enabling the pressure gas to flow through a communicating hole to push the right end face of the piston, driving the sampling valve core to move towards the left side, pushing the gas in the cavity to be discharged through the first pressure gas source inlet, enabling the sampling rod of the sampling valve core to retract into the device, enabling the sampling groove to face the medium outlet at the extreme position, and enabling the medium to flow into the sampling bottle from the medium outlet under the action of gravity; repeating the operation until the required sample amount is obtained;
and step five, after sampling is finished, introducing purge gas through a purge gas source inlet to perform purge.
Compared with the prior art, the invention has the beneficial effects that:
1) the sampling valve comprises a cylinder piston cavity, a cylinder sealing cavity, a cylinder sampling cavity and a sampling valve core, wherein a first pressure gas source inlet of the cylinder piston cavity and a second pressure gas source inlet of the cylinder sealing cavity are respectively connected with a pressure gas source;
the pressure gas enters from the inlet of the first pressure gas source to drive the sampling valve core to move towards the right side, so that the sampling rod of the sampling valve core extends out of the device and enters into a sampling medium, and the medium flows into the sampling groove from the sampling groove opening; after the medium flows into the sampling groove, introducing pressure gas through the second pressure gas source inlet, driving the sampling valve core to move towards the left side by the pressure gas, further enabling the sampling head to retract into the device, enabling the sampling groove to face the medium outlet at the extreme position, and enabling the medium to flow into the sampling bottle from the medium outlet under the action of gravity; repeating the operation until the required sample amount is obtained;
the invention realizes automatic sampling in a closed state, improves the sampling operation efficiency, avoids direct contact between operators and toxic and harmful media, ensures the personal safety of the operators, avoids leakage of the toxic and harmful media, and is beneficial to environmental protection.
2) The invention is provided with a purging gas source inlet which is connected with a purging gas source through a pneumatic quick connector and is used for purging respectively before and after sampling, and aims to remove residual media in the device, avoid the pollution to the device, provide a clean environment for next sampling and ensure the accuracy of the sampling media.
3) The side wall of the piston of the sampling valve core is provided with a sealing groove, and the sampling rod is provided with the sealing groove, a guide groove and a sampling groove; the sampling valve core piston is sealed with the inner wall of the cylinder piston cavity through a sealing ring, the connecting rod is sealed with the inner wall of the cylinder sealing cavity through the sealing ring, and the sampling rod is sealed with the inner wall of the cylinder sampling cavity through the sealing ring; each part is tightly sealed, and the leakage of toxic and harmful media is avoided.
4) According to the invention, a cylinder body piston cavity and a cylinder body sealing cavity are hooped tightly through a hoop joint, and the end surface of the cylinder body piston cavity is tightly pressed and sealed with the end surface of the cylinder body sealing cavity through a sealing ring; the end surface of the cylinder body sealing cavity is tightly pressed and sealed with the end surface of the cylinder body sampling cavity through a sealing ring; each part is tightly sealed, and the leakage of toxic and harmful media is avoided.
5) A buffering structure is arranged at an inlet of a first pressure air source in the cavity of the piston cavity of the cylinder body, so that the piston is prevented from colliding with the inner end face of the cavity of the piston cavity of the cylinder body.
6) The medium outlet is provided with a process chamfer, and the other end face of the sampling cavity of the cylinder body is provided with the process chamfer; when the sampling valve core moves back and forth, the sealing is ensured, and meanwhile, the damage to the sealing ring of the sampling port and the guide ring of the sampling port is also avoided.
7) The open-close type quick connector comprises a quick-open female head and a quick-open male head, after the quick-open male head is inserted into the quick-open female head, a contact surface is sealed by a sealing ring, two opposite-top valve cores interact with each other, and the quick-open male head is communicated with an inner cavity of the quick-open female head; after the quick-opening male head leaves the quick-opening female head, the opposite valve core resets under the action of a reset spring, and the quick-opening male head and the quick-opening female head are respectively sealed; the plug-in connection, the sample bottle loading and unloading is convenient and fast, the quick-opening male head and the quick-opening female head are respectively sealed before and after loading and unloading, and the leakage of toxic and harmful media at the joint is effectively avoided.
Drawings
FIG. 1 is a schematic sectional view of the structure and the working state of the present invention;
FIG. 2 is a schematic cross-sectional view of the piston at the right extreme position (excluding the open-close quick coupling) of the present invention;
FIG. 3 is a schematic cross-sectional view of the piston of the present invention in a left extreme position configuration (excluding the open-close quick coupling);
FIG. 4 is a schematic cross-sectional view of an open-close type quick joint structure of the present invention.
In the figure: 1-cylinder piston cavity 2-cylinder sealing cavity 3-cylinder sampling cavity 4-sampling valve core 5-open-close type quick connector 6-pneumatic quick connector 7-ethylene device pipeline 8-ethylene 9-sampling bottle 10-hoop connector 11-first pressure gas source inlet 12-buffer structure 13-O-shaped sealing ring 21-second pressure gas source inlet 22-communication hole 23-Y-shaped sealing ring 31-nitrogen purging port 32-medium outlet 33-sampling groove process chamfer 34-sampling port process chamfer 35-valve core sealing ring 41-piston 42-connecting rod 43-sampling rod 44-piston sealing 45-sampling port sealing ring 46-sampling port guide ring 47-sampling groove 51-quick-open female head 52 Quick-opening male head 53, opposite-top valve core 54, return spring 55, protective gas outlet 56, sealing ring 57 and clamping sleeve steel ball
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
[ example ] the following:
a closed automatic sampling system as shown in fig. 1-3, a closed automatic sampling system for a large-scale ethylene device in petrochemical industry, which comprises a cylinder piston cavity 1, a cylinder sealing cavity 2, a cylinder sampling cavity 3, a sampling valve core 4, an open-close type quick coupling 5 and a pneumatic quick coupling 6.
The left end face of the cylinder piston cavity 1 is provided with a first pressure air source inlet 11, the first pressure air source inlet 11 is a through hole, a buffer structure 12 is arranged at the position of the first pressure air source inlet 11 in the cylinder piston cavity, the buffer structure 12 is a process groove connected with the tail end of the first pressure air source inlet 11, and the buffer structure 12 prevents the piston 41 from colliding with the inner end face of the cylinder piston cavity 1. The right end face of the cylinder body piston cavity 1 is provided with a sealing groove matched with the O-shaped sealing ring 13.
A second pressure gas source inlet 21 is arranged on the side wall of the cylinder body sealing cavity 2, the second pressure gas source inlet 21 is not a through hole, the second pressure gas source inlet 21 is communicated with the left end face of the cylinder body sealing cavity 2 through a communicating hole 22, and a sealing groove matched with a Y-shaped sealing ring 23 is arranged on the inner wall of the cylinder body sealing cavity 2; two terminal surfaces all are equipped with the seal groove with O type sealing washer 13 adaptation about cylinder body seal chamber 2.
A nitrogen purging port 31 and a medium outlet 32 are arranged on the side wall of the cylinder body sampling cavity 3, the nitrogen purging port 31 and the medium outlet 32 are both through holes, and sampling groove process chamfers 33 are arranged at the medium outlet 32 and the nitrogen purging port 31; the left end face of the cylinder body sampling cavity 3 is provided with a sealing groove matched with the O-shaped sealing ring 13. The right end face of the cylinder body sampling cavity 3 is provided with a sampling port process chamfer 34, and the inner wall of the cylinder body sampling cavity 3 is provided with a sealing groove matched with the valve core sealing ring 35. The medium outlet 32 and the nitrogen purging port 31 are provided with a sampling groove process chamfer 33, the right end face of the cylinder body sampling cavity 3 is provided with a sampling port process chamfer 34, and the sampling port sealing ring 45 and the sampling port guide ring 46 are prevented from being damaged while sealing is ensured during the back-and-forth movement of the sampling valve core 4.
The sampling valve core 4 comprises a piston 41, a connecting rod 42 and a sampling rod 43; the connecting rod 42 and the sampling rod 43 are of an integral structure, and the connecting rod 42 and the piston 41 are connected and sealed through threads. The side wall of the piston 41 is provided with a sealing groove matched with the piston seal 44, the sampling rod 43 is provided with a sealing groove matched with the sampling port sealing ring 45, a guide groove matched with the sampling port guide ring 46 is arranged, and a sampling groove 47 is arranged.
As shown in fig. 4, the openable quick coupling 5 includes a quick-opening female head 51 and a quick-opening male head 52. The quick-opening female head 51 and the quick-opening male head 52 are both provided with a counter valve core 53 and a return spring 54, the quick-opening female head 51 is provided with a protective gas outlet 55 and a sealing groove, the quick-opening female head 51 is connected with the medium outlet 32, and the quick-opening male head 52 is connected with the sampling bottle 9. The quick-opening male head 52 is clamped through a clamping sleeve steel ball 57 after being inserted into the quick-opening female head 51, the contact surface is sealed through a sealing ring 56, a straight opening structure is arranged in an inner hole of the quick-opening female head 51, an O-shaped ring is additionally arranged on the outer cylindrical surface to guarantee the sealing effect during butt joint, the two opposite-top valve cores 53 interact with each other, and the quick-opening male head 51 is communicated with the inner cavity of the quick-opening female head 52. After the quick-opening male head 52 is pulled out of the quick-opening female head 51, the opposite valve core 53 is reset under the action of the reset spring 54, and the quick-opening male head 51 and the quick-opening female head 52 are respectively closed.
The quick-opening male head 51 is inserted into the quick-opening female head 52 to complete connection, the quick-opening male head 51 is pulled out to complete disassembly, and the sampling bottle 9 is convenient and quick to assemble and disassemble. And the quick-opening male head 51 and the quick-opening female head 52 are respectively closed before and after assembly and disassembly, and the quick-opening male head 51 is communicated with the quick-opening female head 52 only when in connection, so that the quick-opening male head and the quick-opening female head are respectively closed before and after assembly and disassembly, and the leakage of toxic and harmful media at the joints is effectively avoided.
As shown in figures 1-3, the right end of the cylinder piston cavity 1 and the left end of the cylinder sealing cavity 2 are hooped tightly through a hoop joint 10, and the right end face of the cylinder piston cavity 1 is tightly pressed and sealed with the left end face of the cylinder sealing cavity 2 through an O-shaped sealing ring 13. The right end of the cylinder body sealing cavity 2 and the left end of the cylinder body sampling cavity 3 are hooped tightly through a hoop joint 10, and the right end face of the cylinder body sealing cavity 2 is compressed and sealed with the left end face of the cylinder body sampling cavity 3 through an O-shaped sealing ring 13. Each part is tightly sealed, and the leakage of toxic and harmful media is avoided.
The sampling valve core piston 41 is arranged in the cylinder piston cavity 1, and the sampling valve core piston 41 is sealed with the inner wall of the cylinder piston cavity 1 through a piston seal 44. The connecting rod 42 is installed in the cylinder body sealing cavity 2, and the connecting rod 42 is sealed with the inner wall of the cylinder body sealing cavity 2 through the Y-shaped sealing ring 23. The sampling rod 43 is arranged in the cylinder body sampling cavity 3, and the sampling rod 43 is sealed with the inner wall of the cylinder body sampling cavity 3 through a valve core sealing ring 45, a sampling port guide ring 46 and a sampling port sealing ring 45. Each part is tightly sealed, and the leakage of toxic and harmful media is avoided.
The pneumatic quick connector 6 is an existing product and can adopt a PC10-02 type, three pneumatic quick connectors 6 are respectively and fixedly connected to a first pressure air source inlet 11, a second pressure air source inlet 21 and a nitrogen purging port 31, the first pressure air source inlet 11 is connected with a first pressure air source through the pneumatic quick connector 6, and the second pressure air source inlet 21 is connected with a second pressure air source through the pneumatic quick connector 6. The nitrogen purging port 31 is connected with a nitrogen gas source through the pneumatic quick connector 6, and is purged with nitrogen respectively before sampling and after sampling, so that residual media in the device are removed, the device is prevented from being polluted, a clean environment is provided for next sampling, and the accuracy of the sampling media is ensured. The medium outlet 32 is connected to the sampling bottle 9 through the openable quick connector 5.
As shown in fig. 1 to 3, a method for sealed automatic sampling of ethylene 8 in an ethylene plant pipe 7 comprises the following steps:
step one, a first pressure air source inlet 11 is connected with a first pressure air source through a pneumatic quick connector 6, a second pressure air source inlet 21 is connected with a second pressure air source through the pneumatic quick connector 6, a nitrogen purging port 31 is connected with the nitrogen air source through the pneumatic quick connector 6, and a medium outlet 32 is connected with a sampling bottle 9 through an opening-closing type quick connector 5.
Step two, introducing nitrogen through a nitrogen purging port 31 for purging;
step three, as shown in fig. 2, as shown by an arrow, introducing pressure gas through the first pressure gas source inlet 11, allowing the pressure gas to flow through the cylinder body sealing cavity 1 to push the left end face of the piston 41, driving the sampling valve core 4 to move towards the right, pushing the gas in the cavity to pass through the communication hole 22 to the second pressure gas source inlet 21 and then discharging, so that the sampling rod 43 of the sampling valve core 4 extends out of the device and enters the ethylene 8, and as shown by an arrow, the ethylene 8 flows into the sampling groove 47 from the sampling groove opening;
step four, as shown in fig. 3, after the ethylene 8 flows into the sampling groove 47, the pressure gas is introduced through the second pressure gas source inlet 21, the pressure gas flows through the communication hole 22 to push the right end face of the piston 41, drive the sampling valve core 4 to move to the left, push the gas in the cavity to be discharged through the first pressure gas source inlet 11, further retract the sampling rod 43 of the sampling valve core 4 into the device, to the extreme position, so that the sampling groove 47 is opposite to the medium outlet 32, and under the action of gravity, the ethylene 8 flows into the sampling bottle 9 through the medium outlet 32; repeating the operation until the required sample amount is obtained;
and step five, after sampling is finished, introducing nitrogen through the nitrogen purging port 31 for purging. Before the sample and sweep respectively after the sample, its purpose is for clear away the interior residual medium of device, avoids causing the pollution to the device, also for next sample provides clean environment, guarantees the degree of accuracy of sample medium.
The invention realizes automatic sampling in a closed state; and the sampling bottle 9 is convenient to assemble and disassemble, and the quick-opening male head 51 and the quick-opening female head 52 are respectively closed before and after assembly and disassembly, so that the leakage at the joint is avoided.
The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (10)
1. A closed automatic sampling system is characterized in that: comprises a cylinder piston cavity, a cylinder sealing cavity, a cylinder sampling cavity and a sampling valve core; the cylinder body piston cavity is provided with a first pressure air source inlet, the cylinder body sealing cavity is provided with a second pressure air source inlet, the cylinder body sampling cavity is provided with a purging air source inlet and a medium outlet, one end of the sampling valve core is provided with a piston, and the other end of the sampling valve core is provided with a sampling groove; the sampling valve core is hermetically arranged in the closed cavity, and the sampling valve core piston is positioned in the cylinder body piston cavity; the first pressure gas source inlet and the second pressure gas source inlet are respectively connected with a pressure gas source, the purging gas source inlet is connected with a purging gas source, and the medium outlet is connected with the sampling bottle.
2. A closed automatic sampling system according to claim 1, characterized in that: the three pneumatic quick connectors are fixedly connected to the first pressure gas source inlet, the second pressure gas source inlet and the purging gas source inlet respectively, and the connection modes are threaded screwing sealing; the first pressure air source inlet, the second pressure air source inlet and the purging air source inlet are respectively connected with respective air sources through pneumatic quick connectors.
3. A closed automatic sampling system according to claim 1, characterized in that: the device also comprises an open-close type quick joint; the open-close type quick connector comprises a quick-open female head and a quick-open male head, wherein the quick-open female head and the quick-open male head are both provided with a counter-acting valve core and a return spring, the quick-open female head is provided with a protective gas outlet and a sealing groove, the quick-open female head is connected with a medium outlet, and the quick-open male head is connected with a sampling bottle; after the quick-opening male head is inserted into the quick-opening female head, the contact surface is sealed by a sealing ring, the two opposite-top valve cores interact with each other, and the quick-opening male head is communicated with the inner cavity of the quick-opening female head; after the quick-opening male head leaves the quick-opening female head, the opposite valve core resets under the action of the reset spring, and the quick-opening male head and the quick-opening female head are respectively closed.
4. A closed automatic sampling system according to claim 1, characterized in that: a first pressure air source inlet is formed in one end face of the cylinder piston cavity and is a through hole, a buffer mechanism is arranged at the first pressure air source inlet in the cylinder piston cavity, and a sealing groove is formed in the other end face of the cylinder piston cavity.
5. A closed automatic sampling system according to claim 1, characterized in that: and a second pressure air source inlet is formed in the side wall of the cylinder body sealing cavity, the second pressure air source inlet is communicated with one end face of the cylinder body sealing cavity through a communicating hole, and the inner wall and the two end faces are provided with sealing grooves.
6. A closed automatic sampling system according to claim 1, characterized in that: a purging gas source inlet and a medium outlet are arranged on the side wall of the cylinder body sampling cavity, the purging gas source inlet and the medium outlet are both through holes, and the purging gas source inlet and the medium outlet are both provided with process chamfers; one end face of the cylinder body sampling cavity is provided with a sealing groove, the other end face of the cylinder body sampling cavity is provided with a process chamfer, and the inner wall of the cylinder body sampling cavity is provided with a sealing groove.
7. A closed automatic sampling system according to claim 1, characterized in that: the sampling valve core comprises a piston, a connecting rod and a sampling rod; the connecting rod and the sampling rod are integrated, and the connecting rod is connected with the piston through threads; the side wall of the piston is provided with a sealing groove, and the sampling rod is provided with a sealing groove, a guide groove and a sampling groove.
8. A closed automatic sampling system according to claim 7, characterized in that: the sampling valve core piston is sealed with the inner wall of the cylinder piston cavity through a sealing ring, the connecting rod is sealed with the inner wall of the cylinder sealing cavity through the sealing ring, and the sampling rod is sealed with the inner wall of the cylinder sampling cavity through the sealing ring.
9. A closed automatic sampling system according to claim 1, characterized in that: the end surface of the piston cavity of the cylinder body is tightly pressed and sealed with the end surface of the sealing cavity of the cylinder body through a sealing ring; the sealed chamber of cylinder body cramps through the clamp joint with the cylinder body sample chamber, and the sealed chamber terminal surface of cylinder body passes through sealing washer and the tight seal of cylinder body sample chamber terminal surface pressure.
10. A method for sealed automatic sampling based on the system of claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9, characterized in that it comprises the following steps:
step one, a first pressure air source inlet is connected with a first pressure air source through a pneumatic quick connector, a second pressure air source inlet is connected with a second pressure air source through a pneumatic quick connector, a purging air source inlet is connected with a purging air source through a pneumatic quick connector, and a medium outlet is connected with a sampling bottle through an opening-closing type quick connector;
secondly, introducing purge gas through a purge gas source inlet to perform purge;
introducing pressure gas through the first pressure gas source inlet, enabling the pressure gas to flow through the cylinder piston cavity to push the left end face of the piston to drive the sampling valve core to move towards the right side, pushing the gas in the cavity to be discharged after flowing to the second pressure gas source inlet through the communicating hole, and enabling the sampling rod of the sampling valve core to extend out of the device to enter a sampling medium, wherein the medium flows into the sampling groove from the sampling groove opening;
after the medium flows into the sampling groove, introducing pressure gas through a second pressure gas source inlet, enabling the pressure gas to flow through a communicating hole to push the right end face of the piston, driving the sampling valve core to move towards the left side, pushing the gas in the cavity to be discharged through the first pressure gas source inlet, enabling the sampling rod of the sampling valve core to retract into the device, enabling the sampling groove to face the medium outlet at the extreme position, and enabling the medium to flow into the sampling bottle from the medium outlet under the action of gravity; repeating the operation until the required sample amount is obtained;
and step five, after sampling is finished, introducing purge gas through a purge gas source inlet to perform purge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010260373.8A CN111272489A (en) | 2020-04-03 | 2020-04-03 | Closed automatic sampling system and method |
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| CN202010260373.8A CN111272489A (en) | 2020-04-03 | 2020-04-03 | Closed automatic sampling system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113606027A (en) * | 2021-07-21 | 2021-11-05 | 上海外高桥造船有限公司 | Exhaust pipe black carbon measurement interface device and ship engine room comprising same |
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2020
- 2020-04-03 CN CN202010260373.8A patent/CN111272489A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113606027A (en) * | 2021-07-21 | 2021-11-05 | 上海外高桥造船有限公司 | Exhaust pipe black carbon measurement interface device and ship engine room comprising same |
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