A filter device for a gas chromatograph and a gas chromatograph

Abstract

The present application relates to the technical fields of gas chromatography analysis, in particular to a filtering device for a gas chromatograph and the gas chromatograph, the filtering device comprising at least one sample cylinder, a mounting seat, the sample cylinder being placed in a placement cavity on the mounting seat, an upper opening of the sample cylinder being closed by an upper shell, the mounting seat and the upper shell being coaxially installed in an internal cavity of a lower shell, a lower rotating seat being coaxially installed in the internal cavity of the lower shell, a spline shaft being arranged at an axis of the lower rotating seat, a driving gear being sleeved on the spline shaft, a first gear being coaxially arranged on the outside of the sample cylinder, the first gear being engaged with the driving gear, a sampling assembly being arranged in the upper shell, the sample cylinder is rotated by the lower rotating seat, and the sample cylinder is vertically vibrated at the same time, the sampling assembly enters the inside of the sample cylinder to suck and sample the sample at the axis of the sample cylinder, and the volatile and semi-volatile components are prevented from leaking.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas chromatography analysis, in particular to a filtering device for a gas chromatograph and the gas chromatograph. BACKGROUND

[0002] The gas chromatograph is generally used for analyzing soil organic matter, such as volatile organic matter, organochlorine, organophosphorus, polycyclic aromatic hydrocarbon, phthalate, etc. that are heat stable and have a boiling point not exceeding 500 DEG C. When analyzing volatile and semi-volatile components, a purge and trap method can be used, i.e. using a flowing gas to "purge" the volatile components in the sample, and then using a trap to adsorb the purged organic matter, and then desorbing the sample by heat and sending it into the gas chromatograph for analysis. A thermal desorption method can also be used, i.e. adsorbing the sample to be measured in a sampling tube containing an adsorption material for enrichment, and then heating the sampling tube to desorb the volatile and semi-volatile components from the adsorption material, and then using a carrier gas to carry the desorbed components into the gas chromatograph for analysis. In the study of soil organic matter, the sample that can be directly used for gas chromatography analysis must be a gas or a liquid, so the soil sample needs to be extracted by the above method before analysis. Chinese patent CN111272920A discloses a gas chromatograph sample injection filtering device, which comprises four groups of supports, a main body, a dosing tank, a motor frame, a motor, a coupling, a shaft seat, a rotating shaft, a conveying pipe, a water pump, a filter box, a screen, a fiber layer and a discharge pipe. The top ends of the four groups of supports are connected to the bottom end of the main body. The main body is internally provided with a cavity. The top end of the main body is provided with an inlet and an outlet, and the inlet and the outlet are both communicated with the cavity. The bottom end of the dosing tank is communicated with the inlet. The bottom end of the motor frame is communicated with the top end of the main body. The front end of the motor is connected to the rear end of the motor frame. The output end of the motor is connected to the input end of the rotating shaft through the coupling. The input end of the rotating shaft is rotatably connected to the inner wall of the shaft seat. The bottom end of the shaft seat is connected to the top end of the main body. The outer wall of the rotating shaft is provided with a plurality of stirring blades. The input end of the conveying pipe passes through the outlet and extends into the cavity of the main body.

[0003] The device adds soil and solution into the cavity of the main body through the dosing tank. The motor is turned on, and the output end of the motor drives the coupling and the rotating shaft to rotate together. The plurality of rotating stirring blades oscillate and stir the soil and the solvent. Then the motor is turned off. After a period of standing, the water pump is turned on. The solution in the upper layer of the cavity of the main body is sucked into the cavity of the filter box through the conveying pipe. However, the solution needs to be standing after stirring before being extracted, which is low in working efficiency and easy to cause leakage of volatile and semi-volatile components during extraction. SUMMARY

[0004] In view of the above problems, it is necessary to provide a filtering device for a gas chromatograph and the gas chromatograph in view of the problems of the prior art.

[0005] To solve the problems of the prior art, the technical scheme adopted by the present application is as follows:

[0006] The utility model provides a filtering device for gas chromatograph, including at least one soil and solution sample cylinder is placed, and the mounting seat for placing sample cylinder, sample cylinder is placed in the placement cavity of the upper side setting of mounting seat, the upper side opening of sample cylinder is closed through the upper casing, the lower casing is coaxial with the upper casing setting, mounting seat and upper casing are coaxially installed in the internal cavity of from top to bottom insert in the lower casing, the coaxial mounting of spiral stirring silk is set up in the sleeve of the lower casing, and the spiral stirring silk enters the inside of sample cylinder and is stirred to the soil.

[0007] Preferably, the upper casing opening is downwardly sleeved above the mounting seat, the upper casing opening is provided with a pressing strip around the periphery, the outer wall of the pressing strip is attached to the inner wall of the lower casing, when the pressing strip is attached to the upper side of the mounting seat, the bottom of the upper casing is attached to the upper side opening of the sample cylinder; the bottom of the upper casing is provided with a sleeve, the number of the sleeve is the same as that of the sample cylinder, the axis of the sleeve is in the same straight line with the placement cavity, the inner wall of the sleeve is attached to the outer wall of the sample cylinder; the lower casing opening is provided with a surrounding mounting strip, a circular limit cover is mounted on the mounting strip, the inner wall of the limit cover is attached to the outer wall of the upper casing, a return spring is arranged in the lower casing, the two ends of the return spring are elastically connected to the lower side of the limit cover and the upper side of the pressing strip, the return spring applies a spring force to the downward movement of the mounting seat and the lower casing. Preferably, the coaxial spiral stirring wire is arranged in the sleeve, the spiral stirring wire enters the inside of the sample cylinder to stir the soil.

[0008] Preferably, the periphery of the mounting seat is provided with a radial limit rod, the limit rod is inserted into the waist-shaped hole arranged on the lower casing; the waist-shaped hole extends vertically along the axis of the lower casing, and the width of the waist-shaped hole is the same as the diameter of the limit rod.

[0009] Preferably, a buffer spring is arranged between the mounting seat and the lower rotating seat, the buffer spring is elastically connected to the bottom of the mounting seat and the top of the lower casing.

[0010] Preferably, the inner wall and the bottom of the placement cavity of the mounting seat are provided with grooves, and the grooves are placed with balls, the balls are attached to the outer wall of the sample cylinder.

[0011] Preferably, the upper part of the upper shell is provided with a cavity, and the upper shell is provided with a first through hole coaxial with the axis of the placing cavity; the sampling assembly comprises a first moving frame coaxially installed on the upper part of the lower shell, and the first moving frame is provided with a sampling tube for storing the solvent, volatile and semi-volatile components required for detection, the sampling tube is inserted into the first through hole, a sealing ring is fixedly installed on the upper side of the first through hole, the sealing ring is attached to the outer wall of the sampling tube, the bottom of the sampling tube is provided with a blocking block, and the blocking block blocks the first through hole when it is attached to the bottom of the upper shell; a plurality of filter holes penetrating the sampling tube in the radial direction are arranged on the upper side of the sampling tube, and the sealing ring blocks the filter holes when the blocking block is attached to the bottom of the upper shell; a radial liquid outlet extending to the top end of the sampling tube is arranged on the sampling tube, the liquid outlet extends to the sample inlet device of the gas chromatograph through a liquid outlet pipeline; the opening at the upper end of the sampling tube is blocked by a piston rod, and the upward movement of the piston rod causes the solvent, volatile and semi-volatile components in the sample cylinder to directly enter the sampling tube through the filter holes; the piston rod is installed on a second moving frame coaxially arranged on the upper side of the first moving frame, and a vertical straight rod extending upward is arranged on the first moving frame and penetrates a second through hole arranged on the second moving frame.

[0012] Preferably, the straight rod is provided with a scale vertically arranged along the axis of the straight rod.

[0013] Preferably, the lateral side of the upper shell is provided with at least one horizontal inner sliding groove extending outward, a limiting block is slidingly installed in the inner sliding groove, a spring is arranged in the inner sliding groove, the spring exerts a spring force on the limiting block protruding from the inside of the upper shell, and the bottom of the first moving frame is attached to the upper side of the limiting block when the blocking block of the sampling assembly is attached to the bottom of the upper shell; the inner side of the limiting block is provided with a curved surface on the lower side; a lever is arranged on the upper side of the outer end of the limiting block and is inserted into a second waist-shaped hole arranged on the upper side of the inner sliding groove, and the second waist-shaped hole extends in the radial direction of the upper shell.

[0014] A gas chromatograph comprises a filtering device for the gas chromatograph.

[0015] The beneficial effects of the present application compared with the prior art are:

[0016] Firstly, after the sample cylinder is sealed by the mounting seat and the upper shell, the mounting seat is driven by the lower rotating seat to vibrate, so that the soil and the solution in the sample cylinder are rapidly vibrated to make the soil and the solution rapidly and fully contact.

[0017] Secondly, under the cooperation of the mounting seat and the lower rotating seat, the soil and the solution in the sample cylinder are rotated, and under the action of centrifugation, the soil particles are close to the inner wall of the sample cylinder, the liquid at the axis of the sample cylinder contains fewer soil particles, the particle impurities in the sample are reduced when the sampling assembly sucks the sample, damage to the gas chromatograph is avoided, the time wasted due to the need for standing is reduced, and the detection efficiency is improved.

[0018] Thirdly, the pressing strip of the upper shell of the present application always keeps in close contact with the upper side of the mounting seat under the elastic force of the reset spring, so as to ensure the closure of the sleeve to the opening of the sample cylinder when the sample cylinder vibrates and rotates, prevent the leakage of soil and solution, and also ensure that the volatile and semi-volatile components will not leak during extraction. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a perspective view of a filtering device for a gas chromatograph;

[0020] Figure 2 is a perspective sectional view of a filtering device for a gas chromatograph;

[0021] Figure 3 is a perspective exploded view of a filtering device for a gas chromatograph;

[0022] Figure 4 is Figure 3 is a partial enlarged view of A of

[0023] Figure 5 is a front view of a filtering device for a gas chromatograph;

[0024] Figure 6 is a sectional view of a filtering device for a gas chromatograph in a first working state along the B-B direction of Figure 5 ;

[0025] Figure 7 is Figure 6 is a partial enlarged view of C of

[0026] Figure 8 is a sectional view of a filtering device for a gas chromatograph in a second working state along the B-B direction of Figure 5 ;

[0027] Figure 9 is Figure 8 is a partial enlarged view of D of

[0028] Figure 10 is a sectional view of a filtering device for a gas chromatograph in a third working state along the B-B direction of Figure 5 ;

[0029] Figure 11 is Figure 10 is a partial enlarged view of E of

[0030] Figure 12 is Figure 10 is a partial enlarged view of F of

[0031] The figure marks are: 1, sample cylinder; 11, first gear; 12, edge strip; 2, mounting seat; 21, placing cavity; 211, ball; 22, avoiding hole; 23, first protruding tooth; 24, limiting rod; 3, upper shell; 31, edge strip; 32, sleeve; 321, spiral stirring wire; 322, first through hole; 323, sealing ring; 33, inner sliding groove; 331, spring; 332, second waist-shaped hole; 34, limiting block; 341, pull rod; 4, lower shell; 41, mounting strip; 42, limiting cover; 421, reset spring; 43, waist-shaped hole; 5, lower rotating seat; 51, rotating driver; 52, spline shaft; 53, driving gear; 54, second protruding tooth; 55, buffer spring; 6, sampling assembly; 61, first moving frame; 611, straight rod; 612, scale; 62, sampling tube; 621, plugging block; 622, filter hole; 623, liquid outlet; 624, liquid outlet pipeline; 63, piston rod; 64, second moving frame; 641, second through hole. DETAILED DESCRIPTION

[0032] In order to further understand the features, technical means and specific purposes and functions achieved by the present application, the present application will be described in further detail below in conjunction with the drawings and specific embodiments.

[0033] REFERENCE Figures 1 to 12 :

[0034] A filtering device for a gas chromatograph, comprising at least one sample cylinder 1 for placing soil and solution, and a mounting seat 2 for placing the sample cylinder 1, the sample cylinder 1 being placed in a placing cavity 21 arranged on the upper side of the mounting seat 2, the upper side opening of the sample cylinder 1 being closed by an upper shell 3, a lower shell 4 being coaxially arranged with the upper shell 3, the mounting seat 2 and the upper shell 3 being inserted from top to bottom into the internal cavity of the lower shell 4, a lower rotating seat 5 being coaxially arranged inside the lower shell 4, the lower rotating seat 5 being below the mounting seat 2, a rotating driver 51 for driving the lower rotating seat 5 to rotate around its axis being fixedly arranged outside the lower shell 4; a spline shaft 52 being arranged at the axis of the lower rotating seat 5, the spline shaft 52 extending to above the mounting seat 2 through the avoiding hole 22 on the mounting seat 2, a driving gear 53 being sleeved on the spline shaft 52, a first gear 11 being coaxially arranged on the outer side of the sample cylinder 1, the first gear 11 being engaged with the driving gear 53, the lower rotating seat 5 driving the sample cylinder 1 to rotate in the placing cavity 21 through its rotation; the mounting seat 2 being provided with a first protruding tooth 23 around the periphery on the bottom, the lower side of the first protruding tooth 23 intermittently contacting the upper side of a second protruding tooth 54 arranged around the periphery on the upper side of the lower rotating seat 5, the lower rotating seat 5 rotating to make the mounting seat 2 and the upper shell 3 drive the sample cylinder 1 to vibrate in the vertical direction; a sampling assembly 6 being arranged inside the upper shell 3, the sampling assembly 6 entering the axis of the sample cylinder 1 to suck and sample the solvent, volatile and semi-volatile components in the sample cylinder 1.

[0035] A filtering device for a gas chromatograph in the present application includes at least one sample cylinder 1. The worker pours the soil and liquid to be tested into the sample cylinder 1 and places the sample cylinder 1 in the placement cavity 21 of the mounting seat 2. The upper shell 3 is then mounted on the mounting seat 2 to seal the opening of the sample cylinder 1. In this embodiment, a sample cylinder 1 with four placement cavities 21 is shown, so that four sample cylinders 1 can be placed at one time to sample a variety of different soils. The mounting seat 2 is placed inside the lower shell 4 and is located above the lower rotating seat 5 provided in the lower shell 4. The lower rotating seat 5 is rotated by The rotary driver 51 can realize the rotation around the axis of the mounting base 2. The rotary driver 51 can be a servo motor. When the rotary driver 51 is started, it drives the lower rotating base 5 to rotate, and the lower rotating base 5 drives the spline shaft 52 to rotate. The spline shaft 52 drives the driving gear 53 to rotate synchronously. The first gear 11 installed on the outside of the sample cylinder 1 is engaged with the driving gear 53 after the sample cylinder 1 is placed in the placement cavity 21. Therefore, when the driving gear 53 rotates, it can drive the first gear 11 and the sample cylinder 1 to rotate synchronously in the placement cavity 21. The rotation of the sample cylinder 1 generates a certain centrifugal force, which makes the soil and the solution move. The liquid is mixed, and the mass of the soil particles is large, so they move outward under the centrifugal effect; since the bottom of the mounting seat 2 in this embodiment is provided with a first convex tooth 23, and the upper side of the lower rotating seat 5 is provided with a second convex tooth 54 that contacts the first convex tooth 23, when the lower rotating seat 5 rotates, the second convex tooth 54 moves along the first convex tooth 23, so that the mounting seat 2 in the lower shell 4 moves up and down quickly along the axis of the lower shell 4, and the soil and solution in the sample cylinder 1 are shaken, thereby improving the contact and fusion effect of the soil and solution, and ensuring the uniformity of the solvent in the sample cylinder 1. In this embodiment, the driving gear 53 is sleeved on the spline On the shaft 52, when the mounting base 2 vibrates, the driving gear 53 can also follow the vibration of the mounting base 2 to move in the vertical direction along the axis of the spline shaft 52 to ensure the rotation of the driving sample tube 1; in this embodiment, with the cooperation of the mounting base 2 and the lower rotating base 5, the soil and solution in the sample tube 1 are shaken to ensure sufficient contact between the soil and the solution, and under the action of centrifugation, the soil particles are made to adhere to the inner wall of the sample tube 1. The liquid at the axis inside the sample tube 1 contains fewer soil particles, which reduces the particulate impurities in the sample when the sampling component 6 sucks the sample, reduces the time wasted due to the need for static, and improves the efficiency of detection.

[0036] In order to ensure that the upper housing 3 is mounted on the mounting base 2 and can block the opening of the sample cylinder 1 when the sample cylinder 1 rotates and vibrates, the following features are specifically provided:

[0037] The upper shell 3 is downwardly sleeved on the mounting seat 2, and the upper shell 3 is provided with a pressing strip 31 on the opening side, the outer wall of the pressing strip 31 is attached to the inner wall of the lower shell 4, when the pressing strip 31 is attached to the upper side of the mounting seat 2, the bottom of the upper shell 3 is attached to the upper opening of the sample cylinder 1, the bottom of the upper shell 3 is provided with a sleeve 32, the number of the sleeve 32 is the same as that of the sample cylinder 1, the axis of the sleeve 32 is in the same straight line with the placement cavity 21, the inner wall of the sleeve 32 is attached to the outer wall of the sample cylinder 1, the lower shell 4 is provided with a surrounding mounting strip 41 on the opening side, the mounting strip 41 is provided with a circular limiting cover 42, the inner wall of the limiting cover 42 is attached to the outer wall of the upper shell 3, the lower shell 4 is provided with a reset spring 421, the two ends of the reset spring 421 are elastically connected to the lower side of the limiting cover 42 and the upper side of the pressing strip 31, and the reset spring 421 applies elastic force to the downward movement of the mounting seat 2 and the lower shell 4.

[0038] In the embodiment, the mounting seat 2 is placed in the lower rotating seat 5, when the upper shell 3 is downwardly sleeved on the mounting seat 2, the bottom of the upper shell 3 is attached to the upper opening of the sample cylinder 1 to seal the sample cylinder 1, the sleeve 32 below the upper shell 3 is sleeved on the outer wall of the sample cylinder 1 to prevent the soil and solution in the sample cylinder 1 from flowing out, the inner wall of the sleeve 32 is attached to the outer wall of the sample cylinder 1, which does not prevent the sample cylinder 1 from rotating, the lower end of the sleeve 32 is attached to the pressing strip 12 of the sample cylinder 1 to prevent the sample cylinder 1 from separating from the placement cavity 21 during rotation, the pressing strip 31 on the opening of the upper shell 3 is attached to the upper side of the mounting seat 2, then the limiting cover 42 is installed on the mounting strip 41 of the lower shell 4, the inner wall of the limiting cover 42 is attached to the outer wall of the upper shell 3 to stabilize the axis of the upper shell 3, the reset spring 421 below the limiting cover 42 is elastically connected to the lower side of the limiting cover 42 and the upper side of the pressing strip 31, and the reset spring 421 always applies elastic force to the downward movement of the lower shell 4, when the lower rotating seat 5 rotates to drive the mounting seat 2 and the upper shell 3 to move upwardly, the upward movement of the mounting seat 2 and the upper shell 3 can compress the reset spring 421, the pressing strip 31 of the upper shell 3 always maintains attachment to the upper side of the mounting seat 2 under the elastic force of the reset spring 421, so that the sleeve 32 can seal the opening of the sample cylinder 1 to prevent the leakage of soil, solution and volatile and semi-volatile components in the sample cylinder 1 during vibration and rotation of the sample cylinder 1.

[0039] In order to improve the mixing effect of the soil and solution in the sample cylinder 1, the following features are provided:

[0040] The sleeve 32 is provided with a spiral stirring wire 321 coaxially, and the spiral stirring wire 321 enters the inside of the sample cylinder 1 to stir the soil.

[0041] After the upper shell 3 is installed on the mounting seat 2, the sleeve 32 and the placement cavity 21 are in the same straight line, the sleeve 32 seals the upper side opening of the sample cylinder 1, the helical stirring wire 321 installed in the sleeve 32 enters the inside of the sample cylinder 1, the helical extension of the helical stirring wire 321 can release the space inside the sample cylinder 1 to facilitate the sample taking assembly 6 to extract the solution at the axis of the sample cylinder 1, and when the lower rotating seat 5 rotates to drive the sample cylinder 1 to vibrate, the helical stirring wire 321 can be in full contact with the soil, so that the soil clumps possibly existing in the sample cylinder 1 collide with the helical stirring wire 321, and the contact effect of the solution in the sample cylinder 1 and the soil is improved.

[0042] In order to prevent the second protruding tooth 54 from driving the mounting seat 2 to rotate synchronously when the lower rotating seat 5 rotates, the following features are specifically provided:

[0043] The mounting seat 2 is provided with a limiting rod 24 extending in the radial direction, and the limiting rod 24 is inserted into the waist-shaped hole 43 provided on the lower shell 4; the waist-shaped hole 43 extends vertically along the axis direction of the lower shell 4, and the width of the waist-shaped hole 43 is the same as the diameter of the limiting rod 24.

[0044] When the mounting seat 2 in the embodiment is installed in the lower shell 4, the limiting rod 24 horizontally protruding on the mounting seat 2 is inserted into the waist-shaped hole 43 of the lower shell 4, and when the lower rotating seat 5 rotates, the second protruding tooth 54 is in contact with the first protruding tooth 23 at the bottom of the mounting seat 2; because the waist-shaped hole 43 limits the limiting rod 24, the mounting seat 2 cannot rotate according to the lower rotating seat 5, and the mounting seat 2 can only move up and down to realize the vibration of the sample cylinder 1.

[0045] In order to realize the purpose of reducing the impact force of the mounting seat 2 on the lower rotating seat 5 when the mounting seat 2 vibrates, the following features are specifically provided:

[0046] The mounting seat 2 and the lower rotating seat 5 are provided with a buffer spring 55, and the buffer spring 55 elastically connects the bottom of the mounting seat 2 and the top of the lower shell 4.

[0047] In the embodiment, the mounting seat 2 and the lower rotating seat 5 are elastically connected through the buffer spring 55, the buffer spring 55 applies an upward thrust to the mounting seat 2, and when the mounting seat 2 moves up and down, the impact force of the mounting seat 2 on the lower rotating seat 5 is reduced, so that the noise is reduced and the friction between the first protruding tooth 23 and the second protruding tooth 54 is reduced.

[0048] In order to prevent a large amount of friction from being generated when the sample cylinder 1 rotates in the placement cavity 21, the following features are specifically provided:

[0049] The inner wall and the bottom of the placement cavity 21 of the mounting seat 2 are provided with grooves, and the grooves are placed with the ball 211, and the ball 211 is attached to the outer wall of the sample cylinder 1.

[0050] When the sample cylinder 1 in the embodiment is placed in the placement cavity 21, the bottom and the outer wall of the sample cylinder 1 are in contact with the built-in rolling balls 211 in the placement cavity 21, the sample cylinder 1 and the placement cavity 21 are kept in the same straight line through the multi-point support of the rolling balls 211, when the sample cylinder 1 rotates, the presence of the rolling balls 211 makes the sliding friction between the sample cylinder 1 and the inner wall of the placement cavity 21 change into the rolling friction between the sample cylinder 1 and the rolling balls 211, which improves the smoothness of the rotation of the sample cylinder 1 and avoids the influence of the friction heat caused by the rotation of the sample cylinder 1 on the solvent in the sample cylinder 1.

[0051] In order to realize the purpose that the sampling assembly 6 can suck and sample the solvent at the axis of the sample cylinder 1, the following features are specifically provided:

[0052] The upper shell 3 is provided with a cavity, and the upper shell 3 is provided with a first through hole 322 coaxial with the axis of the placing cavity 21; the sampling assembly 6 comprises a first moving frame 61 coaxially installed on the upper portion of the lower shell 4, and the first moving frame 61 is provided with a sampling tube 62 for storing the solvent, volatile and semi-volatile components required for detection, the sampling tube 62 is inserted into the first through hole 322, a sealing ring 323 is fixedly installed on the upper side of the first through hole 322, the sealing ring 323 is attached to the outer wall of the sampling tube 62, the bottom of the sampling tube 62 is provided with a blocking block 621, and the blocking block 621 blocks the first through hole 322 when it is attached to the bottom of the upper shell 3; a plurality of filter holes 622 penetrating the sampling tube 62 in the radial direction are arranged on the upper side of the sampling tube 62, and the sealing ring 323 blocks the filter holes 622 when the blocking block 621 is attached to the bottom of the upper shell 3; the sampling tube 62 is provided with a radial liquid outlet 623 near the top end, the liquid outlet 623 extends to the sample inlet device of the gas chromatograph through a liquid outlet pipeline 624; the opening at the upper end of the sampling tube 62 is blocked by a piston rod 63, and the upward movement of the piston rod 63 makes the solvent, volatile and semi-volatile components in the sample cylinder 1 directly enter the sampling tube 62 through the filter holes 622; the piston rod 63 is installed on a second moving frame 64, and the second moving frame 64 is coaxially arranged on the upper side of the first moving frame 61, and the first moving frame 61 is provided with a vertical straight rod 611 extending upward, and the straight rod 611 penetrates through a second through hole 641 arranged on the second moving frame 64.The sampling assembly 6 in the embodiment comprises two coaxially arranged first moving frames 61 and second moving frames 64, which are arranged in the cavities on the upper side of the upper shell 3 and can be moved, the first moving frames 61 are provided with sampling tubes 62 equal in number to the placement cavities 21, and the second moving frames 64 are provided with piston rods 63 equal in number to the sampling tubes 62, in the embodiment, the sampling tubes 62 and the piston rods 63 are four in number, the sampling tubes 62 are inserted into the inside of the sample cylinder 1 through the first through holes 322 arranged on the upper shell 3, and the blocking blocks 621 at the bottom of the sampling tubes 62 are located in the sleeves 32, in the normal state, the sleeves 32 are attached to the lower side of the upper shell 3 to block the first through holes 322, so as to ensure the sealing effect of the upper shell 3 on the sample cylinder 1 and prevent the leakage of volatile and semi-volatile components, at this time, the piston rods 63 installed on the second moving frames 64 are completely inserted into the piston rods 63, when the sampling assembly 6 starts to extract the solvent in the sample cylinder 1, the first moving frames 61 can be driven to move downward by a linear actuator such as an electric push rod or manually pulled by a worker, the sampling tubes 62 are driven to move downward, the filter holes 622 at the bottom of the sampling tubes 62 are moved to the inside of the sample cylinder 1, at this time, the second moving frames 64 are driven to move upward relative to the first moving frames 61 by a linear actuator such as an electric push rod or manually driven by a worker, the piston rods 63 inserted into the sampling tubes 62 are moved upward, the negative pressure generated in the sampling tubes 62 causes the solvent or volatile and semi-volatile components in the sample cylinder 1 to flow into the sampling tubes 62 through the filter holes 622, the filter holes 622 filter the soil particle impurities possibly contained in the solvent, then the first moving frames 61 drive the second moving frames 64 to move upward as a whole, and the extracted solvent is located in the sampling tubes 62, when the first moving frames 61 move upward to the position where the blocking blocks 621 of the sampling tubes 62 are attached to the bottom of the upper shell 3, the filter holes 622 at the bottom of the sampling tubes 62 are wrapped and sealed by the first through holes 322, the solvent remains in the sampling tubes 62 and cannot leak through the filter holes 622, the second moving frames 64 are moved upward again to drive the piston rods 63 to move upward to the position of the release outlet 623, at this time, the solvent without solid impurities in the sampling tubes 62 can be discharged through the liquid outlet pipeline 624 and enter the sample inlet device of the gas chromatograph connected with the liquid outlet pipeline 624; when the sampling assembly 6 is started by a linear actuator such as an electric push rod, the operation of the sampling assembly 6 to extract the solvent in the sample cylinder 1 can be directly performed in the process of rotating the sample cylinder 1, the time for standing the solvent in the prior art is reduced, the work efficiency is improved, and the leakage of volatile and semi-volatile components does not occur when the sampling tubes 62 enter the sample cylinder 1 to sample.

[0053] In order to facilitate the workers to observe the sampling content, the following features are specifically provided:

[0054] The straight rod 611 is provided with scales 612 arranged vertically upward along the axis of the straight rod 611.

[0055] The staff judges the height of the piston rod 63 moving up in the sampling tube 62 by observing the scale 612 on the straight rod 611, and then judges the content of the extracted solvent and the position of the bottom end of the piston rod 63, ensuring that a certain amount of solvent is extracted while the piston rod 63 does not expose the liquid outlet 623 when the filter hole 622 of the sampling tube 62 is inside the sample cylinder 1, causing the air pressure inside the sampling tube 62 to decrease.

[0056] In order to solve the problem that the first movable frame 61 of the sampling assembly 6 may vibrate when the sample cylinder 1 is vibrated, resulting in the filter hole 622 being unable to block the first through hole 322, the following features are specifically provided:

[0057] The circumferential side of the upper shell 3 is provided with at least one inner slide groove 33 extending horizontally outward, and a limit block 34 is slidably installed in the inner slide groove 33, and a spring 331 is provided in the inner slide groove 33. The spring 331 applies elastic force to the limit block 34 protruding from the interior of the upper shell 3. When the blocking block 621 of the sampling assembly 6 is attached to the bottom of the upper shell 3, the bottom of the first movable frame 61 is attached to the upper side of the limit block 34; the lower side of the inward side of the limit block 34 is provided with an arc surface; the upper side of the outward end of the limit block 34 is provided with a lever 341, and the lever 341 is inserted into the second waist-shaped hole 332 provided on the upper side of the inner slide groove 33, and the second waist-shaped hole 332 extends radially along the upper shell 3.

[0058] When the first movable frame 61 in this embodiment moves up to the filter hole 622 at the bottom end of the sampling tube 62 and fits the bottom of the upper shell 3, the lower side of the first movable frame 61 fits the upper side of the limit block 34 installed on the upper shell 3. The upper side of the limit block 34 is a plane. Therefore, when the sample cylinder 1 vibrates, the first movable frame 61 cannot move due to the cooperation between the blocking block 621 and the limit block 34, so the sealing state of the sample cylinder 1 during vibration is kept stable. When it is necessary to start the sampling assembly 6 to extract the test solvent, the staff can pull the limit block 34 up manually or through a linear drive such as an electric push rod. The lever 341 on the side causes the limit block 34 to move toward the inner groove 33. When the limit block 34 is completely in the inner groove 33, the first movable frame 61 and the second movable frame 64 can move downward in line with the inner wall of the upper shell 3; after releasing the lever 341, the limit block 34 is reset under the elastic force of the spring 331, and the second movable frame 64 and the first movable frame 61 contact the arc surface below the second movable frame 64 when moving upward, thereby automatically pressing the limit block 34 into the inner groove 33 while moving in line with the arc surface, and automatically reset when the first movable frame 61 moves to the upper side of the limit block 34.

[0059] A gas chromatograph includes a filtering device for the gas chromatograph.

[0060] A filtering device for a gas chromatograph is installed at the input end of the sampling device of the gas chromatograph, and the sampling device is connected to the sampling assembly 6 to sample and detect the solution extracted from the filtering device.

[0061] Working principle: the staff pours the soil and liquid to be detected into the sample cylinder 1, and places the sample cylinder 1 in the placing cavity 21 of the mounting seat 2, then installs the upper shell 3 on the mounting seat 2 to block the opening of the sample cylinder 1, rotates the drive 51 to drive the lower rotating seat 5 to rotate, the lower rotating seat 5 can drive the sample cylinder 1 to rotate synchronously in the placing cavity 21, the sample cylinder 1 rotates to generate a certain centrifugal force, and the mounting seat 2 moves up and down in the lower shell 4 along the axis of the lower shell 4, the soil and solution in the sample cylinder 1 are shaken, the first moving frame 61 moves downward to drive the sampling tube 62 to move downward, the filter hole 622 at the bottom of the sampling tube 62 moves to the inside of the sample cylinder 1, the second moving frame 64 moves upward relative to the first moving frame 61, the piston rod 63 inserted in the sampling tube 62 moves upward, the negative pressure generated in the sampling tube 62 makes the solvent in the sample cylinder 1 flow into the sampling tube 62 through the filter hole 622, then the first moving frame 61 drives the second moving frame 64 to move upward as a whole, the extracted solvent is located in the sampling tube 62, the second moving frame 64 moves upward again to drive the piston rod 63 to move upward to the position of the liquid release port 623, at this time, the solvent without solid impurities in the sampling tube 62 can be discharged through the liquid outlet pipeline 624 and enter the sampling device of the gas chromatograph connected to the liquid outlet pipeline 624.

[0062] The above embodiments only express one or several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be noted that, for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A filter device for a gas chromatograph, characterized by, The utility model provides a soil and solution sample placing device, comprising at least one sample cylinder (1) for placing soil and solution, and a mounting seat (2) for placing the sample cylinder (1), the sample cylinder (1) is placed in the placing cavity (21) arranged on the upper side of the mounting seat (2), the upper side opening of the sample cylinder (1) is closed by the upper shell (3), the lower shell (4) is coaxially arranged with the upper shell (3), the mounting seat (2) and the upper shell (3) are inserted from top to bottom in the internal cavity of the lower shell (4), the lower rotating seat (5) is coaxially arranged in the internal cavity of the lower shell (4), the lower rotating seat (5) is below the mounting seat (2), and the rotating driver (51) for driving the lower rotating seat (5) to rotate around the axis of the lower rotating seat (5) is fixedly installed on the outside of the lower shell (4). A spline shaft (52) is arranged at the axis of the lower rotating seat (5), the spline shaft (52) extends to above the mounting seat (2) through the avoiding hole (22) on the mounting seat (2), the spline shaft (52) is sleeved with a driving gear (53), the outer side of the sample cylinder (1) is coaxially arranged with a first gear (11), the first gear (11) is engaged with the driving gear (53), and the lower rotating seat (5) drives the sample cylinder (1) to rotate in the placing cavity (21) by rotating itself. The bottom of the mounting seat (2) is provided with a first convex tooth (23) around the circumferential side, the upper side of the lower rotating seat (5) is provided with a second convex tooth (54) around the circumferential side, the lower side of the first convex tooth (23) intermittently contacts the upper side of the second convex tooth (54), and the lower rotating seat (5) rotates to drive the mounting seat (2) and the upper shell (3) to drive the sample cylinder (1) to vibrate in the vertical direction. The upper shell (3) is provided with a sampling assembly (6), and the sampling assembly (6) enters the axis of the sample cylinder (1) to suck and sample the solvent, volatile and semi-volatile components in the sample cylinder (1). The upper shell (3) is provided with a cavity on the upper part, and the upper shell (3) is provided with a first through hole (322) arranged on the same line with the axis of the placing cavity (21). The sampling assembly (6) comprises a first moving frame (61) coaxially arranged on the upper part of the lower shell (4), the first moving frame (61) is provided with a sampling tube (62) for storing the solvent, volatile and semi-volatile components required for detection, the sampling tube (62) is inserted into the first through hole (322), a sealing ring (323) is fixedly arranged on the upper side of the first through hole (322), the sealing ring (323) is attached to the outer wall of the sampling tube (62), the bottom of the sampling tube (62) is provided with a blocking block (621), and the blocking block (621) blocks the first through hole (322) when being attached to the bottom of the upper shell (3). The sampling tube (62) is provided with a plurality of filter holes (622) penetrating the sampling tube (62) in the radial direction on the upper side of the filter hole (622), the sealing ring (323) blocks the filter hole (622) when the blocking block (621) is attached to the bottom of the upper shell (3); the sampling tube (62) is provided with a radial extension liquid outlet (623) close to the top end, and the liquid outlet (623) extends to the sample inlet device of the gas chromatograph through a liquid outlet pipeline (624). The upper end of the sampling tube (62) is sealed by a piston rod (63), and the upward movement of the piston rod (63) allows the solvent, volatile and semi-volatile components in the sample cylinder (1) to directly enter the sampling tube (62) through the filter hole (622); The piston rod (63) is installed on the second moving frame (64), which is coaxially arranged on the upper side of the first moving frame (61), and the first moving frame (61) is provided with a straight rod (611) extending vertically upward, and the straight rod (611) penetrates through the second through hole (641) arranged on the second moving frame (64).

2. A filter device for a gas chromatograph according to claim 1, characterized in that The upper shell (3) is downwardly sleeved on the mounting seat (2), and the upper shell (3) is provided with a pressing strip (31) on the outer side of the opening, the outer wall of the pressing strip (31) is attached to the inner wall of the lower shell (4), the pressing strip (31) is attached to the upper side of the mounting seat (2), and the bottom of the upper shell (3) is attached to the upper side of the sample cylinder (1). The bottom of the upper shell (3) is provided with a sleeve (32), the number of the sleeve (32) is the same as that of the sample cylinder (1), the axis of the sleeve (32) is coaxial with the placement cavity (21), and the inner wall of the sleeve (32) is attached to the outer wall of the sample cylinder (1). The lower shell (4) is provided with a surrounding mounting strip (41) on the outer side of the opening, the mounting strip (41) is provided with a circular limiting cover (42), the inner wall of the limiting cover (42) is attached to the outer wall of the upper shell (3), the lower shell (4) is provided with a reset spring (421), and the two ends of the reset spring (421) are elastically connected to the lower side of the limiting cover (42) and the upper side of the pressing strip (31). The reset spring (421) exerts a downward elastic force on the mounting seat (2) and the lower shell (4).

3. A filter assembly for a gas chromatograph as defined in claim 2, wherein, The sleeve (32) is coaxially provided with a spiral stirring wire (321), and the spiral stirring wire (321) enters the inside of the sample cylinder (1) to stir the soil.

4. The filter apparatus for a gas chromatograph according to claim 2, wherein The mounting seat (2) is provided with a limiting rod (24) extending in the radial direction on the outer side, and the limiting rod (24) is inserted into the waist-shaped hole (43) arranged on the lower shell (4). The waist-shaped hole (43) extends vertically along the axis direction of the lower shell (4), and the width of the waist-shaped hole (43) is the same as the diameter of the limiting rod (24).

5. The filter assembly for a gas chromatograph of claim 2, wherein, The mounting seat (2) and the lower rotating seat (5) are provided with a buffer spring (55), and the buffer spring (55) is elastically connected to the bottom of the mounting seat (2) and the top of the lower shell (4).

6. A filter assembly for a gas chromatograph as defined in claim 2, wherein, The inner wall and the bottom of the placement cavity (21) of the mounting seat (2) are provided with grooves, and the grooves are provided with balls (211), and the balls (211) are attached to the outer wall of the sample cylinder (1).

7. The filter assembly for a gas chromatograph of claim 1, wherein, The straight rod (611) is provided with a scale (612) arranged vertically upward along the axis of the straight rod (611).

8. The filter apparatus for a gas chromatograph according to claim 1, wherein The upper shell (3) is provided with at least one horizontal outwardly extending inner sliding groove (33), the inner sliding groove (33) is slidably installed with a limiting block (34), the inner sliding groove (33) is provided with a spring (331), the spring (331) exerts a spring force on the limiting block (34) to protrude from the inside of the upper shell (3), when the blocking block (621) of the sampling assembly (6) is attached to the bottom of the upper shell (3), the bottom of the first moving frame (61) is attached to the upper side of the limiting block (34); The inner side of the limiting block (34) is provided with an arc surface on the lower side; The outer end of the limiting block (34) is provided with a pull rod (341) on the upper side, the pull rod (341) is inserted into the second waist-shaped hole (332) provided on the upper side of the inner sliding groove (33), and the second waist-shaped hole (332) extends radially along the upper shell (3).

9. A gas chromatograph characterized by, The filter device for a gas chromatograph comprises the filter device according to claim 1.

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