CN211718205U

CN211718205U - Negative pressure sampling device with buffer

Info

Publication number: CN211718205U
Application number: CN201922314621.8U
Authority: CN
Inventors: 范昱伦; 甫亚峰; 余青霓; 王朱昌; 赵小琴
Original assignee: Changzhou Panyu Instrument Co ltd
Current assignee: Changzhou Panyu Instrument Co ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-10-20
Anticipated expiration: 2029-12-20

Abstract

The utility model discloses a negative pressure sampling device with buffer, which comprises a bottom plate, a vacuum pump and a main pipe, wherein the bottom plate is positioned at the lowest part of the whole device, one end of the upper part of the bottom plate is fixedly provided with the vacuum pump, one end of the vacuum pump is fixedly provided with the main pipe, the utility model is scientific and reasonable, the use is safe and convenient, the device adopts multi-valve buffer sampling, can protect the service life of a membrane valve, prevent the membrane from being damaged by washing, can eliminate the interference of a system pipeline to the maximum extent, reduce errors, is convenient for controlling the reading of a vacuum gauge in a multi-valve sampling mode, adopts a mainstream sampling mode of highly integrated gas phase equipment to perform negative pressure through a pumping system, reads the vacuum degree by using the vacuum gauge or the vacuum gauge, and finally quantifies a sample through a quantifying ring, thereby achieving a method of rapid sampling, the device can be, the sampling mode can keep the purity of the whole system and reduce the adsorption of the tube wall, thereby ensuring that the measurement result is more accurate.

Description

Negative pressure sampling device with buffer

Technical Field

The utility model relates to a gas chromatograph sampling device technical field specifically is a negative pressure sampling device of area buffering.

Background

The negative pressure sample introduction is that a mechanical pump or a molecular pump is used to pump the interior of a sample introduction system into low vacuum, the pressure difference is utilized to send the gas to be detected into a GC sample introduction system, the quantitative analysis method of the quantitative analysis of the quantitative loop and the chromatographic column is adopted, the negative pressure sample introduction is the mainstream sample introduction mode of the highly integrated gas phase device, the negative pressure is pumped by a pumping system, the vacuum degree is read by a vacuum gauge, and finally, the sample is quantified by a quantifying ring, thereby achieving the method of rapid sample introduction, being capable of controlling through software integration, greatly saving manpower, keeping the purity of the whole system by the sample introduction mode, reducing the adsorption of the tube wall, thereby the measuring result is more accurate, the uncertainty is lower, the manufacturing cost in the prior art is high, the connector of the sample injection electromagnetic valve is expensive, the requirement on air tightness is high, the required vacuum degree can not be controlled, configuration software and programs need to be manufactured according to requirements, and therefore people need a negative pressure sample injection device with a buffer to solve the problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a negative pressure sampling device of area buffering to solve the problem that provides among the prior art.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a negative pressure sampling device of area buffering, includes bottom plate, vacuum pump, main pipe fitting, V0 solenoid valve, V1 solenoid valve, flow path selection valve, the bottom plate is located the below of complete equipment, the bottom plate plays the effect of supporting complete equipment, bottom plate top one end fixed mounting has the vacuum pump, the vacuum pump is used for taking out the vacuum with the pipe fitting is inside, the sampling operation of this device of being convenient for, vacuum pump one end fixed mounting has main pipe fitting, main pipe fitting plays the effect of first minute pipe of intercommunication, second minute pipe, third minute pipe, fourth minute pipe, main pipe fitting is kept away from vacuum pump one end fixed mounting and is had flow path selection valve, flow path selection valve can select for use DVS-4-16MT-0001 type flow path selection valve, flow path selection valve is convenient for the convection bank of flow path, selects first minute pipe and is responsible for communicating, or the second minute pipe and is responsible for communicating, the utility model discloses a vacuum pump, including main pipe fitting, vacuum pump, vacuum 1 solenoid valve, V1 solenoid valve, vacuum pump and main pipe fitting, the main pipe fitting is close to vacuum pump one end fixed mounting has a V1 solenoid valve, V1 solenoid valve is used for controlling whether the vacuum pump carries out the vacuum extraction to the pipeline, opens when V1 solenoid valve, and the vacuum pump can carry out evacuation operation to main pipe fitting, closes when V1 solenoid valve, and under the V1 solenoid valve closure state, outside air can not get into the main pipe fitting that has been pumped into the vacuum from V1 solenoid valve, is favorable to the maintenance of vacuum state, is convenient for the negative pressure and advances the appearance, main pipe fitting is close to flow path selection valve one end fixed mounting has a V0 solenoid valve, V0 solenoid valve also plays the effect of sealing main pipe fitting.

Flow path selection valve keeps away from main pipe fitting one side fixed mounting has first branch pipe, first branch pipe is the pipe of advancing, first branch pipe is close to flow path selection valve one end fixed mounting has V5 solenoid valve, flow path selection valve one end fixed mounting has V4 solenoid valve is kept away from to first branch pipe, V5 solenoid valve one side fixed mounting has the reducing joint is kept away from to V4 solenoid valve.

The flow path selection valve is kept away from main pipe fitting one side fixed mounting and is divided the pipe to have the second, the second is divided the pipe and is close to flow path selection valve one end fixed mounting and has V6 solenoid valve, the second is divided the pipe and is kept away from flow path selection valve one end fixed mounting and has V7 solenoid valve, V7 solenoid valve is kept away from V6 solenoid valve one side fixed mounting and has reducer union.

The main pipe fitting middle part one side fixed mounting has the third to be managed, fixed mounting has the V2 solenoid valve on the third is managed, the third is divided the pipe and is kept away from main pipe fitting one end fixed mounting and has the reducing joint.

A fourth branch pipe is fixedly arranged on one side of the middle part of the main pipe fitting, which is far away from the third branch pipe, a V3 electromagnetic valve is fixedly arranged on the fourth branch pipe, a reducer union is fixedly arranged at one end of the fourth branch pipe, which is far away from the main pipe fitting, the reducer union plays a role in connecting the first branch pipe or the second branch pipe with an external sample introduction pipe fitting and also plays a role in connecting the third branch pipe or the fourth branch pipe with an external quantitative ring sample introduction pipe fitting, when negative pressure sample introduction operation is carried out, the V0 electromagnetic valve, the V1 electromagnetic valve, the V5 electromagnetic valve and the V6 electromagnetic valve are opened, the vacuum pump is started to pump negative pressure to the pipeline, a reading of the vacuum gauge is observed, when a proper vacuum degree is reached, the vacuum pump and the V1 electromagnetic valve are closed, the electromagnetic valve in the pipe fitting is in a negative pressure state at the moment, the V5 electromagnetic valve and the V6 electromagnetic valve are closed, then the V4, then closing the V4 electromagnetic valve and the V7 electromagnetic valve, opening the V5 electromagnetic valve and the V6 electromagnetic valve, balancing the sample gas with the air pressure in the pipe fitting, then switching the flow path selection valve, selecting the main pipe fitting to be communicated with the first branch pipe or the second branch pipe, and then opening the V2 electromagnetic valve or the V3 electromagnetic valve, so that the sample is filled in the external quantitative ring through the pipe fitting connected with the external quantitative ring due to negative pressure.

The main pipe is close to V0 solenoid valve department fixed mounting and has the vacuometer, can know intraductal vacuum in real time when the vacuometer is convenient for take out the negative pressure, and the vacuum reaches and advances the appearance standard and can stop the negative pressure extraction.

The V0 electromagnetic valve, the V1 electromagnetic valve, the V2 electromagnetic valve, the V3 electromagnetic valve, the V4 electromagnetic valve, the V5 electromagnetic valve, the V6 electromagnetic valve, the V7 electromagnetic valve and the flow path selection valve can be externally connected with a PLC controller through electric wires, the PLC controller is in signal connection with external software, an operator can control the electromagnetic valves or the flow path selection valves through the software, the V0 electromagnetic valve, the V1 electromagnetic valve, the V2 electromagnetic valve, the V3 electromagnetic valve, the V4 electromagnetic valve, the V5 electromagnetic valve, the V6 electromagnetic valve, the V7 electromagnetic valve and the flow path selection valve can also be electrically connected with an external switch through the electric wires, and the operator controls the electromagnetic valves or the flow.

Compared with the prior art, the beneficial effects of the utility model are that:

this device adopts the multivalve buffering to advance kind, can protect the membrane valve life-span, prevent that the diaphragm from being washed out, can furthest get rid of system's pipeline interference, reduce the error, and the appearance mode of advancing of multivalve is convenient for control the gauge reading, the negative pressure advances the kind and is the mainstream appearance mode of advancing of highly integrated gas phase equipment, through pump system negative pressure, and read vacuum with the gauge, carry out the ration through the ration ring to the sample at last, thereby reach the method of advancing the appearance fast, this device can be controlled through software integration, the manpower has been saved greatly, this kind of appearance mode can keep entire system's purity, reduce the pipe wall and adsorb, thereby make measuring result more accurate, the uncertainty is lower.

Drawings

Fig. 1 is a schematic view of a top view structure of a buffered negative pressure sample injection device of the present invention;

fig. 2 is a schematic view of a main view structure of a buffered negative pressure sample injection device of the present invention;

FIG. 3 is a schematic left-view structural diagram of a buffered negative pressure sample injection device of the present invention;

FIG. 4 is a schematic view of a main structure of a reducer union of a buffered negative pressure sample injection device of the present invention;

fig. 5 is the schematic view of the section structure of the reducer union of the buffered negative pressure sample injection device of the present invention.

Reference numbers in the figures: 1. a base plate; 2. a vacuum pump; 3. a main pipe; 31. a first branch pipe; 32. A second branch pipe; 33. thirdly, pipe distribution; 34. a fourth branch pipe; 4. a V0 solenoid valve; 41. A V1 solenoid valve; 42. a V2 solenoid valve; 43. a V3 solenoid valve; 44. a V4 solenoid valve; 45. a V5 solenoid valve; 46. a V6 solenoid valve; 47. a V7 solenoid valve; 5. a flow path selection valve; 6. a vacuum gauge; 7. a reducing joint.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example (b): as shown in fig. 1-5, the utility model provides a negative pressure sampling device with buffer, including a bottom plate 1, a vacuum pump 2, a main pipe 3, a V0 solenoid valve 4, a V1 solenoid valve 41, a flow path selection valve 5, the bottom plate 1 is located at the lowest part of the whole set of device, the bottom plate 1 plays a role of supporting the whole set of device, one end of the upper part of the bottom plate 1 is fixedly provided with the vacuum pump 2, the vacuum pump 2 is used for vacuumizing the interior of the pipe, thereby facilitating the sampling operation of the device, one end of the vacuum pump 2 is fixedly provided with the main pipe 3, the main pipe plays a role of communicating a first branch pipe 31, a second branch pipe 32, a third branch pipe 33 and a fourth branch pipe 34, one end of the main pipe 3 far away from the vacuum pump 2 is fixedly provided with the flow path selection valve 5, the flow path selection valve 5 is convenient for selecting the first branch pipe 31 to communicate with the main pipe 3, or, the main pipe fitting 3 is fixedly provided with a V1 electromagnetic valve 41 near one end of the vacuum pump 2, the V1 electromagnetic valve 41 is used for controlling whether the vacuum pump 2 performs vacuum extraction on a pipeline or not, when the V1 electromagnetic valve 41 is opened, the vacuum pump 2 is communicated with the main pipe fitting 3, the vacuum pump 2 can perform vacuum extraction operation on the main pipe fitting, when the V1 electromagnetic valve 41 is closed, the vacuum pump 2 cannot perform vacuum extraction operation on the main pipe fitting 3, and under the closing state of the V1 electromagnetic valve 41, external air cannot enter the main pipe fitting 3 which is already vacuumized from the V1 electromagnetic valve 41, which is beneficial to maintaining a vacuum state and facilitating negative pressure sample injection, the main pipe fitting 3 is fixedly provided with a V0 electromagnetic valve 4 near one end of the flow path selection valve 5, the V0 electromagnetic valve 4 also plays a role in closing the main pipe fitting 3, so as to avoid air entering.

The first branch pipe 31 is fixedly installed on the side, away from the main pipe fitting 3, of the flow path selection valve 5, the first branch pipe 31 is a sampling pipe, the V5 electromagnetic valve 45 is fixedly installed at one end, close to the flow path selection valve 5, of the first branch pipe 31, the V4 electromagnetic valve 44 is fixedly installed at one end, away from the flow path selection valve 5, of the first branch pipe 31, and the reducer union 7 is fixedly installed on the side, away from the V5 electromagnetic valve 45, of the V4 electromagnetic valve 44.

The second branch pipe 32 is fixedly installed on the side of the flow path selection valve 5 far away from the main pipe fitting 3, the V6 electromagnetic valve 46 is fixedly installed on one end of the second branch pipe 32 close to the flow path selection valve 5, the V7 electromagnetic valve 47 is fixedly installed on one end of the second branch pipe 32 far away from the flow path selection valve 5, and the reducer union 7 is fixedly installed on one side of the V7 electromagnetic valve 47 far away from the V6 electromagnetic valve 46.

A third branch pipe 33 is fixedly installed on one side of the middle of the main pipe fitting 3, a V2 electromagnetic valve 42 is fixedly installed on the third branch pipe 33, and a reducer union 7 is fixedly installed at one end, far away from the main pipe fitting 3, of the third branch pipe 33.

A fourth branch pipe 34 is fixedly arranged on one side of the middle part of the main pipe fitting 3, which is far away from the third branch pipe 33, a V3 electromagnetic valve 43 is fixedly arranged on the fourth branch pipe 34, a reducer union 7 is fixedly arranged at one end of the fourth branch pipe 34, which is far away from the main pipe fitting 3, the reducer union 7 plays a role of connecting the first branch pipe 31 or the second branch pipe 32 with an external sample introduction pipe fitting and also plays a role of connecting the third branch pipe 33 or the fourth branch pipe 34 with an external quantitative ring sample introduction pipe fitting, when the negative pressure sample introduction operation is carried out, the V0 electromagnetic valve 4, the V1 electromagnetic valve 41, the V5 electromagnetic valve 45 and the V6 electromagnetic valve 46 are firstly opened, the rest electromagnetic valves are all closed, the vacuum pump 2 is started to pump negative pressure for the pipeline, the reading of the vacuum gauge 6 is observed, the vacuum pump 2 and the V1 electromagnetic valve 41 are closed, the pipe fitting is in a negative pressure state at the moment, the V, A V7 solenoid valve 47, which makes the sample gas enter the first branch pipe 31 and the second branch pipe 32, then closes the V4 solenoid valve 44, the V7 solenoid valve 47, opens the V5 solenoid valve 45, the V6 solenoid valve 46, at this time, the sample gas is balanced with the pressure in the pipe, then switches the flow path selection valve 5, selects the main pipe 3 to communicate with the first branch pipe 31 or the second branch pipe 32, then opens the V2 solenoid valve 42 or the V3 solenoid valve 43, so that the sample fills the external quantitative ring through the pipe connected with the external quantitative ring due to the negative pressure.

The vacuum gauge 6 is fixedly installed at the position, close to the V0 electromagnetic valve 4, of the main pipe fitting 3, the vacuum gauge 6 can know the vacuum degree in the pipe in real time when negative pressure is conveniently pumped, and the vacuum degree reaches the sample injection standard and can stop negative pressure pumping.

All the electromagnetic valves in the device can adopt ASCO brand MP-C-165 type electromagnetic valves, the vacuum pump in the device can adopt ULVAC brand GLD-N051 type vacuum pumps, and the vacuum gauge in the device can adopt an INFICON brand CDG025D type vacuum gauge.

The utility model discloses a theory of operation is:

when an operator performs negative pressure sample injection operation, firstly opening the V0 electromagnetic valve 4, the V1 electromagnetic valve 41, the V5 electromagnetic valve 45 and the V6 electromagnetic valve 46, closing the rest electromagnetic valves, starting the vacuum pump 2 to pump negative pressure on a pipeline, observing readings of the vacuum gauge 6, closing the vacuum pump 2 and the V1 electromagnetic valve 41 when the proper vacuum degree is reached, closing the V5 electromagnetic valve 45 and the V6 electromagnetic valve 46 when the pipeline is in a negative pressure state, then opening the V4 electromagnetic valve 44 and the V7 electromagnetic valve 47 to enable sample gas to enter the first branch pipe 31 and the second branch pipe 32, then closing the V4 electromagnetic valve 44 and the V7 electromagnetic valve 47, opening the V5 electromagnetic valve 45 and the V6 electromagnetic valve 46 when the sample gas is balanced with the pressure of the pipeline, then switching the flow path selection valve 5, selecting the main pipeline 3 to be communicated with the first branch pipe 31 or the second branch pipe 32, then opening the V2 electromagnetic valve 42 or the V3 electromagnetic valve 43 to enable the sample to be filled with an external quantitative ring through a, at this time, the sample injection operation of the quantitative loop is completed.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a negative pressure sampling device of area buffering which characterized in that: including bottom plate (1), vacuum pump (2), person in charge spare (3), V0 solenoid valve (4), V1 solenoid valve (41), flow path selection valve (5), bottom plate (1) is located the below of whole equipment, bottom plate (1) top one end fixed mounting has vacuum pump (2), vacuum pump (2) one end fixed mounting has main pipe fitting (3), vacuum pump (2) one end fixed mounting is kept away from in main pipe fitting (3) has flow path selection valve (5), main pipe fitting (3) are close to vacuum pump (2) one end fixed mounting and have V1 solenoid valve (41), main pipe fitting (3) are close to flow path selection valve (5) one end fixed mounting and have V0 solenoid valve (4).

2. The negative pressure sampling device with the buffer function of claim 1, which is characterized in that: flow path selection valve (5) are kept away from main pipe fitting (3) one side fixed mounting and are first to be divided pipe (31), first branch pipe (31) are close to flow path selection valve (5) one end fixed mounting has V5 solenoid valve (45), flow path selection valve (5) one end fixed mounting is kept away from in first branch pipe (31) has V4 solenoid valve (44), V4 solenoid valve (44) are kept away from V5 solenoid valve (45) one side fixed mounting has reducing joint (7).

3. The negative pressure sampling device with the buffer function of claim 2, wherein: flow path selection valve (5) are kept away from main pipe fitting (3) one side fixed mounting and are divided pipe (32) to the second, the second is divided pipe (32) and is close to flow path selection valve (5) one end fixed mounting and have V6 solenoid valve (46), flow path selection valve (5) one end fixed mounting is kept away from to second branch pipe (32) has V7 solenoid valve (47), V7 solenoid valve (47) are kept away from V6 solenoid valve (46) one side fixed mounting and have reducing joint (7).

4. The negative pressure sampling device with the buffer function of claim 1, which is characterized in that: main pipe fitting (3) middle part one side fixed mounting has the third to divide pipe (33), fixed mounting has V2 solenoid valve (42) on the third divides pipe (33), main pipe fitting (3) one end fixed mounting is kept away from in the third divides pipe (33) has reducer union (7).

5. The negative pressure sampling device with the buffer function of claim 4, wherein: the pipe fitting (3) middle part is kept away from third and is divided pipe (33) one side fixed mounting and have the fourth to divide pipe (34), fixed mounting has V3 solenoid valve (43) on the fourth is divided pipe (34), main pipe fitting (3) one end fixed mounting is kept away from in fourth branch pipe (34) has reducer union (7).

6. The negative pressure sampling device with the buffer function of claim 1, which is characterized in that: and a vacuum gauge (6) is fixedly arranged at the position, close to the V0 electromagnetic valve (4), of the main pipe fitting (3).

7. The buffered negative pressure sample injection device according to any one of claims 3 and 5, wherein: the V0 electromagnetic valve (4), the V1 electromagnetic valve (41), the V2 electromagnetic valve (42), the V3 electromagnetic valve (43), the V4 electromagnetic valve (44), the V5 electromagnetic valve (45), the V6 electromagnetic valve (46), the V7 electromagnetic valve (47) and the flow path selection valve (5) are electrically connected with an external control device.