CN211374219U

CN211374219U - Volume-adjustable sampling and sample-feeding system

Info

Publication number: CN211374219U
Application number: CN201922313365.0U
Authority: CN
Inventors: 赵成坚; 余青霓; 殷德峰; 赵小琴; 陈志杰
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: 2020-08-28
Anticipated expiration: 2029-12-20

Abstract

The utility model discloses a sample sampling system with adjustable volume, including lead screw step motor and the motor cabinet of setting in lead screw step motor bottom, lead screw step motor output is the lead screw, be provided with the crack nut that disappears on the lead screw, it fixes a position the ear to be fixed with flexible on the crack nut to disappear, the both ends of ear are fixed a position to stretch out and draw back are provided with the direction optical axis, ear fixedly connected with ration plunger is fixed a position to stretch out and draw back. The utility model discloses an adopt accurate lead screw step motor to drive the ration plunger and remove inside the ration container to the realization is to the change of device container volume, made things convenient for the user to the use of device, and the device can adjust the mode of appearance is advanced to the sample as required, the convenience of device has been improved greatly, can reduce the phenomenon that the peak shape widens when using the injection mode simultaneously, and can realize once taking a sample through the injection mode, the operation of appearance is advanced many times, and then make the use of device more convenient.

Description

Volume-adjustable sampling and sample-feeding system

Technical Field

The utility model relates to a detect the relevant equipment field, specifically be a sample sampling system with adjustable volume.

Background

For the automatic sampling of gas and liquid in the online sampling process of a sample, the volume of the sample is generally a fixed value and cannot be adjusted, in many cases, a user needs to adjust the sampling amount according to the content, the property and other conditions of the sample, and if a larger or smaller volume needs to be obtained, only a quantitative ring or a sampling ring, even a sampling valve body, can be replaced, so that the working efficiency of the device is reduced.

However, the existing sampling and sample feeding system in the online process has the following disadvantages:

1. the existing online sampling and sampling system is fixed in volume, and can only disassemble the device to replace a quantitative ring when sampling and sampling gas or liquid with different volumes, so that the use of the device is very inconvenient, and the working efficiency is reduced.

2. The existing online sampling and sampling system can only sample and sample in a single mode, so that the device has great limitation in use.

3. The existing online sampling and sampling system generally needs to use a large-volume quantitative ring for improving the sensitivity, or adopts a backpressure technology, and the peak shape can be widened by the methods, so that the using effect of the device is poor.

4. The existing online sampling and sampling system cannot control the sampling of the device due to the defects of the structure of the system, so that the use process of the device is complicated.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a volume adjustable sampling and sampling system, which solves the problems that the prior sampling and sampling system only can be disassembled to replace a quantitative ring when the sampling and sampling are needed to be carried out on the gas with different volumes due to fixed volume, thereby causing the use of the device to be very inconvenient, thereby causing the reduction of the working efficiency and the prior sampling and sampling system only can carry out sampling and sampling in a single mode, thereby causing the use of the device to have larger limitation, simultaneously solving the problems that the prior online sampling and sampling system generally needs to use a large-volume quantitative ring for improving the sensitivity or adopts a back pressure technology, the modes can cause the peak shape to be widened, thereby causing the poor use effect of the device, further solving the problems that the prior sampling and sampling system can not control the sampling of the device due to the defects of the structure per se, and then lead to the comparatively loaded down with trivial details problem of use of device.

In order to achieve the above object, the utility model provides a following technical scheme: a volume-adjustable sampling and sampling system, which comprises a screw rod stepping motor and a motor base arranged at the bottom of the screw rod stepping motor, the motor base is provided with radiating fins, the output end of the screw rod stepping motor is provided with a screw rod, the screw rod stepping motor can adopt a corresponding matched stepping motor according to actual conditions, the screw rod is provided with a gap eliminating nut, a telescopic positioning lug is fixed on the anti-backlash nut, two ends of the telescopic positioning lug are provided with guide optical axes, the telescopic positioning lug is fixedly connected with a quantitative plunger, the bottom of the motor base is fixedly connected with a fixed frame, the guide optical axis is matched with the fixed frame for use, the bottom of the screw rod is provided with a quantitative container, the quantitative container is provided with a sample inlet, the quantitative container is provided with a sample outlet, and the sample outlet and the sample inlet can be subjected to quantity adjustment according to needs.

Preferably, the motor cabinet with mount fixed connection, just the lead screw sets up at the inside intermediate position of mount, through setting up the mount, and then guarantees the straightness that hangs down of ration plunger, and then makes the more accurate of device.

Preferably, mount top both sides all seted up with direction optical axis assorted through-hole, direction optical axis top runs through the through-hole, and through setting up the through-hole, and then makes the installation of direction optical axis more convenient, and has further guaranteed the straightness that hangs down of ration plunger through setting up the direction optical axis to further strengthen the precision of device.

Preferably, the anti-backlash nut, the telescopic positioning lug and the quantitative plunger are connected in a fitting mode, and the anti-backlash nut, the telescopic positioning lug and the quantitative plunger are fixedly connected through bolts, so that the device is convenient to use.

Preferably, ration plunger outer wall with be provided with seal assembly between the ration container inner wall, seal assembly comprises gland nut and sealed the pad, gland nut with the ration plunger outer wall is connected, just gland nut set up at the ration plunger outer wall with between the ration container inner wall, sealed the pad setting in the gland nut bottom, sealed pad and gland nut can make the adjustment according to the temperature of difference, pressure, the nature of sample etc. when the temperature is higher, optionally use high temperature resistant sealed the pad, and when the appearance frequency is higher, can adopt the better material of wearability with sealed the pad, through setting up seal assembly, and then improved the leakproofness between ration plunger and the ration container.

Preferably, the quantitative container is an inerted quantitative container, the quantitative plunger is an inerted quantitative plunger, the sample outlet is an inerted sample outlet, and the sample inlet is an inerted sample outlet, so that the gas or liquid adsorption residue in the quantitative container is reduced by inerting the quantitative container, the quantitative plunger, the sample outlet and the sample inlet, and the precision of the device is further improved.

The utility model provides a sample sampling system with adjustable volume possesses following beneficial effect:

(1) the utility model discloses a set up lead screw step motor, the lead screw, the ration plunger, the ration container, when using, the output shaft through lead screw step motor drives the lead screw and rotates, and then can drive the reference column stopper at the ration container back-and-forth movement to can make cavity volume continuous variation, and then make the user when needs change the volume of device inside, only need the simple and convenient operation of software, need not tear the quick-witted change, and then make the device use more convenient, thereby can accelerate user's work efficiency.

(2) The utility model discloses a set up lead screw step motor, the ration plunger, the ration container, the sample import, the sample export, when the device is used, can carry out different mode samples to the device as required, firstly will regard this cavity as the ration ring of six-way valve, firstly can independently regard as sample sampling system, it is optional to have two kinds of sampling modes of negative pressure extraction and pressurization ration again under independent sample sampling system, and then make the device can select supporting the use according to user's actual conditions, and the user can try more headspace methods and obtain optimal scheme, and then make the use of device get up more conveniently.

(3) The utility model discloses a set up lead screw step motor, ration plunger, ration container, after pressurizing the ration to the device, when the carrier gas switches into this cavity and takes the determinand to get into gas chromatograph, can be through starting the injection mode for in the faster entering chromatograph of determinand, fabulous assurance peak shape does not widen, and this injection speed is adjustable, and then makes the use of device more convenient, and the effect is better.

(4) The utility model discloses a set up lead screw step motor, ration plunger, ration container, be in under the injection mode at the device, the sample in the ration container can be controlled according to user's needs, can carry out disposable injection, also can not carry out disposable injection, when not carrying out disposable injection, and then can realize sample once taking, advance a lot of and advance the kind to make the use of device more convenient.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a diagram of the gas circuit connecting the dosing mechanism of the six-way valve according to the present invention;

FIG. 3 is a schematic view of the combined structure of the headspace sampler and the six-way valve of the present invention;

FIG. 4 is a schematic diagram of the independent pressurizing type sampling module of the headspace sampler of the present invention;

fig. 5 is a schematic diagram of the independent negative pressure sampling type sampling and sample introduction module as a headspace sample injector of the present invention.

In the figure: 1. a screw rod stepping motor; 2. a motor base; 3. a screw rod; 4. a telescopic positioning ear; 5. a gap eliminating nut; 6. a dosing plunger; 7. guiding the optical axis; 8. a fixed mount; 9. a dosing container; 10. a sample inlet; 11. a sample outlet; 12. a seal nut; 13. and a gasket.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Example 1:

as shown in fig. 2, when the quantitative mechanism is used as a six-way valve or a ten-way valve, after a user sets a volume, the screw rod stepping motor 1 controls the quantitative plunger 6 to move to a corresponding position to obtain the set volume, the six-way valve is in a sampling state, a sample is quantified by the adjustable quantitative ring, and after the quantification is finished, the six-way valve is switched to enable the carrier gas to carry the sample in the adjustable quantitative ring to enter the next step, and the sample in the adjustable quantitative ring is pushed by the quantitative plunger 6 besides the carrier gas in the process, so that the sample introduction speed is higher, the effect of pulse sample introduction on a gas chromatograph is achieved, and the broadening of the sample during peak discharge is reduced.

Example 2:

as shown in FIG. 3, the system can be used in combination with a six-way valve in a headspace sampler, the headspace sampler is used for sampling by a user, pressurized gas enters a headspace bottle for pressurization after a probe is inserted into the headspace bottle, and quantification is started after the pressurization is finished, before the volume in the quantitative container 8 is set and adjusted, the gas in the headspace bottle enters the quantitative container 8 for quantitative determination after the quantitative determination is started, can be naturally discharged to atmospheric pressure or subjected to back pressure treatment, after the quantification is finished, the six-way valve is switched, the carrier gas carries the sample gas in the quantification container 8 to a chromatograph or other devices capable of analyzing the sample to be detected, when the carrier gas pushes the sample gas to flow out of the quantitative container 8, the screw rod stepping motor 1 is started to push the quantitative plunger 6, the pushing speed can be set, so that the sample gas can enter the analysis equipment more quickly and more intensively, and the effect of pulse injection is achieved.

Example 3:

as shown in FIG. 4, the adjustable quantitative sampling and sampling system of the present invention adopts a quantitative stamping manner when being used as an independent sampling and sampling system of a headspace sampler, i.e. the volume of a quantitative container 8 is fixed in advance, after the balance of the headspace bottle is over, the sampling needle is inserted into the headspace bottle, a two-way switch 1 and a two-way three-way valve 2 of a sampling needle passage are opened, a pressurizing gas passage is pressurized into the headspace bottle via the quantitative container 8 and the sampling needle, after the pressurization to a specified pressure, the pressurizing gas passage is closed, an emptying gas passage is opened, so that the sample gas in the headspace bottle passes through the quantitative container 8, thereby achieving the quantitative purpose, a back pressure valve can be added after the emptying gas passage, after the quantification is over, the two-way three-way valve 1 is opened, the two-way three-way valve 2 is closed, so that the carrier gas carries the sample to enter a chromatograph, and in the process that the carrier gas carries the sample gas to, so that the sample gas is pushed into the chromatograph more quickly to reduce peak broadening.

Example 4:

as shown in fig. 5, the utility model provides an adjustable ration sample introduction system adopts the mode of negative pressure extraction when the independent sample introduction system of headspace sample injector, promptly after the balanced sample introduction needle that finishes of headspace bottle inserts the headspace bottle, open two-way switch 1 of sample introduction needle passageway, lead screw step motor 1 moves backward and drives quantitative plunger 6 backward movement, make gas get into quantitative container 8, the inside volume of quantitative container 8 is set for in advance by software, after the ration, two three-way valve 1 is opened, make the sample that awaits measuring in the carrier pushing quantitative container 8 pass through from the chromatogram passageway of third pipeline spare, get into gas chromatograph or other analytical instruments, also can replace two tee bend and two-way solenoid valve with six-way valve in this example, through the mode that adopts the negative pressure extraction, can also once take a sample, many times of analysis.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a sample sampling system with adjustable volume, includes lead screw step motor (1) and sets up motor cabinet (2) in lead screw step motor (1) bottom, its characterized in that: the lead screw step motor (1) output is lead screw (3), be provided with gap nut (5) that disappears on lead screw (3), be fixed with flexible location ear (4) on gap nut (5) that disappears, the both ends of flexible location ear (4) are provided with direction optical axis (7), flexible location ear (4) fixedly connected with ration plunger (6), motor cabinet (2) bottom fixedly connected with mount (8), direction optical axis (7) with mount (8) cooperation is used, lead screw (3) bottom is provided with quantitative container (9), quantitative container (9) are provided with sample import (10), quantitative container (9) are provided with sample export (11).

2. The volume-adjustable sampling and sampling system according to claim 1, wherein: the motor base (2) is fixedly connected with the fixing frame (8), and the screw rod (3) is arranged in the middle of the inside of the fixing frame (8).

3. The volume-adjustable sampling and sampling system according to claim 1, wherein: the through holes matched with the guide optical axis (7) are formed in the two sides of the top of the fixing frame (8), and the through holes penetrate through the top of the guide optical axis (7).

4. The volume-adjustable sampling and sampling system according to claim 1, wherein: the anti-backlash mechanism is characterized in that the anti-backlash nut (5), the telescopic positioning lug (4) and the quantitative plunger (6) are connected in a fitting manner, and the anti-backlash nut (5), the telescopic positioning lug (4) and the quantitative plunger (6) are fixedly connected through bolts.

5. The volume-adjustable sampling and sampling system according to claim 1, wherein: quantitative plunger (6) outer wall with be provided with seal assembly between quantitative container (9) inner wall, seal assembly comprises gland nut (12) and sealed pad (13), gland nut (12) with quantitative plunger (6) outer wall is connected, just gland nut (12) set up in quantitative plunger (6) outer wall with between quantitative container (9) inner wall, sealed pad (13) set up in gland nut (12) bottom.

6. The volume-adjustable sampling and sampling system according to claim 1, wherein: the quantitative container (9) is an inerting quantitative container (9), the quantitative plunger (6) is an inerting quantitative plunger (6), the sample outlet (11) is an inerting sample outlet (11), and the sample inlet (10) is an inerting sample outlet (11).