CN220419248U

CN220419248U - Sample injection needle guiding mechanism and headspace sample injector

Info

Publication number: CN220419248U
Application number: CN202321688249.7U
Authority: CN
Inventors: 刘宇翔; 周加才; 曲红静; 葛强
Original assignee: BEIJING BEIFEN-RUILI ANALYTICAL INSTRUMENT (GROUP) CO LTD
Current assignee: BEIJING BEIFEN-RUILI ANALYTICAL INSTRUMENT (GROUP) CO LTD
Priority date: 2023-06-29
Filing date: 2023-06-29
Publication date: 2024-01-30
Anticipated expiration: 2033-06-29

Abstract

The utility model provides a sample needle guiding mechanism which comprises a first guide plate with a positioning hole and a needle feeding guide group, wherein the positioning hole is used for installing a sample needle, the needle feeding guide group comprises a guide sleeve, a slide bar and a spring, one end of the slide bar is contained in the guide sleeve, the other end of the slide bar penetrates through the first guide plate, and the spring is sleeved on the slide bar and is clamped between the guide sleeve and the first guide plate. The sample injection needle guiding mechanism provided by the utility model can keep the constant direction when the sample injection needle samples and withdraws the sample, and the needle head is not easy to damage, thereby being beneficial to improving the accuracy of experimental data. The utility model also provides a headspace sampler.

Description

Sample injection needle guiding mechanism and headspace sample injector

[ field of technology ]

The utility model relates to the field of headspace injectors, in particular to a sample needle guiding mechanism and a headspace injector.

[ background Art ]

The headspace analysis is a convenient and quick sample pretreatment method in gas chromatography, and the specific method is that a sample to be detected is placed in a sealed headspace bottle, a headspace sampler drives a sampling needle to pierce the bottle cap of the headspace bottle, the headspace bottle is inserted, and the volatile gas of the sample to be detected is extracted and introduced into the gas chromatography.

Patent CN210742212U discloses a kind of sampling needle protection device of full-automatic headspace sampling device, through manual direct stabbing the sampling needle into the headspace bottle, the extraction top gas. However, when the needle head of the sample injection needle in the prior art adopts a detachable slender metal needle head, and the full-automatic headspace sample injector disclosed in the patent CN210742212U is used, the needle head is difficult to ensure to be inserted into the headspace bottle in a constant direction because the sample injection needle is directly penetrated into the headspace bottle manually, the needle head is easy to skew and shake, the needle head is easy to bend and damage, and then the sample injection cannot be performed, so that experimental data is influenced.

[ utility model ]

The utility model provides a sample needle guiding mechanism and a headspace sample injector for solving the problems that a needle is difficult to be inserted into a headspace bottle vertically when the headspace sample injector in the prior art samples, so that the needle is bent and damaged, and experimental data is influenced.

The utility model provides a sample needle guiding mechanism, includes the first deflector that has the locating hole and advances needle guide group, the locating hole is used for installing the sample needle, advance needle guide group includes uide bushing, slide bar and spring, slide bar one end accept in the uide bushing, the other end runs through first deflector, the spring housing is located the slide bar, and press from both sides and locate the uide bushing with between the first deflector.

The utility model provides a headspace sampler, includes introduction needle guiding mechanism and sample box, introduction needle guiding mechanism is including having the first deflector of locating hole and advance needle guide group, the locating hole is used for installing the introduction needle, advance needle guide group includes uide bushing, slide bar and spring, slide bar one end accept in the uide bushing, the other end runs through first deflector, the spring housing is located the slide bar, and press from both sides and locate the uide bushing with between the first deflector, the sample box is used for acceping the headspace bottle, the sample box includes upper cover and the setting element of having the second through hole, the uide bushing is fixed in the upper cover, the second through hole corresponds the locating hole sets up, the setting element corresponds the second through hole sets up, is used for the location the headspace bottle.

The utility model provides a headspace sampler, includes introduction needle guiding mechanism and sample box, introduction needle guiding mechanism is including having the first deflector of locating hole and advance needle guide group, the locating hole is used for installing the introduction needle, advance needle guide group includes uide bushing, slide bar and spring, slide bar one end accept in the uide bushing, the other end runs through first deflector, the spring housing is located the slide bar, and press from both sides and locate between the uide bushing with first deflector, introduction needle guiding mechanism still includes the second deflector that has first perforation, the second deflector with first deflector relatively the interval sets up, the uide bushing is fixed in the second deflector, first perforation corresponds the locating hole sets up, for supply introduction needle runs through, the sample box is used for acceping the headspace bottle, the sample box includes upper cover and setting element that has the second perforation, the uide bushing is fixed in the upper cover, the second perforation corresponds the locating hole sets up, the setting element corresponds the second perforation is for the same with the locating plate is the top is closed with the locating hole.

Compared with the prior art, the sample needle guiding mechanism provided by the utility model has the advantages that the sample needle is arranged in the positioning hole, the sliding rod guides the first guide plate and the sample needle to move in a constant direction, the sample needle can be inserted into the headspace bottle in a constant direction during moving, and the spring provides a restoring force after sampling, so that the first guide plate and the sample needle reset along the sliding rod.

[ description of the drawings ]

For a clearer description of the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:

fig. 1 is a schematic perspective assembly diagram of a headspace injector according to the present utility model;

FIG. 2 is a cross-sectional view of the headspace injector shown in FIG. 1;

FIG. 3 is a perspective assembly schematic view of the sample needle guide mechanism shown in FIG. 1;

FIG. 4 is a perspective assembly view of the needle insertion guide set of FIG. 3;

FIG. 5 is a cross-sectional view of the needle insertion guide set shown in FIG. 4;

fig. 6 is a schematic perspective view illustrating an assembly of a headspace injector according to another embodiment of the present utility model;

FIG. 7 is a perspective assembly schematic view of the sample needle guide mechanism shown in FIG. 6;

FIG. 8 is a perspective assembly schematic view of the depth adjustment member of FIG. 6;

fig. 9 is a schematic perspective view illustrating an assembly of a headspace injector according to another embodiment of the present utility model.

[ detailed description ] of the utility model

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic perspective assembly diagram of a headspace sampler according to the present utility model, and fig. 2 is a cross-sectional view of the headspace sampler shown in fig. 1. The utility model provides a headspace sampler 100, which is used for fixing a sampling needle 200 and a headspace bottle 300, driving the sampling needle 200 to penetrate into the headspace bottle 300, and extracting sample gas volatilized from a sample to be tested in the headspace bottle 300.

The headspace sampler 100 comprises a sample needle guiding mechanism 10 and a sample box 50, wherein the sample needle guiding mechanism 10 is installed on the sample box 50, the sample needle 200 is installed on the sample needle guiding mechanism 10, and the headspace bottle 300 is arranged on the sample box 50.

Please refer to fig. 3 in combination, which is a schematic perspective assembly diagram of the sample needle guiding mechanism shown in fig. 1. The sample needle guiding mechanism 10 includes a first guiding plate 11 with positioning holes 111 and a needle feeding guiding set 13, the positioning holes 111 are used for installing the sample needles 200, the number of the positioning holes 111 may be one or more, and the needle feeding guiding set 13 guides the first guiding plate 11 to move towards or away from the sample box 50.

Referring to fig. 4 in combination, a schematic perspective assembly view of the needle insertion guide set shown in fig. 3 is shown. The needle-feeding guide set 13 comprises a guide sleeve 131, a slide bar 132 and a spring 134, wherein one end of the slide bar 132 is accommodated in the guide sleeve 131, the other end of the slide bar penetrates through the first guide plate 11, and the spring 134 is sleeved on the slide bar 132 and is clamped between the guide sleeve 131 and the first guide plate 11.

Referring to fig. 5 in combination, a cross-sectional view of the needle insertion guide set shown in fig. 4 is shown. The guide sleeve 131 has a stepped blind hole structure, the slide rod 132 is abutted to the bottom surface 1311 of the stepped blind hole structure, and the spring 134 is abutted to the step 1313 of the stepped blind hole structure.

In this embodiment, the number of the needle-inserting guide groups 13 is four, and the needle-inserting guide groups 13 are arranged in a rectangular shape, in other embodiments, the number of the needle-inserting guide groups 13 may be one, may be two, are oppositely arranged, the three may be arranged in a triangle, the four may be arranged in a quadrangle, the plurality may be arranged in a polygon, a circle, an ellipse, or the like, and the present utility model is not limited thereto.

Preferably, refer again to fig. 5. The sliding rod 132 includes a rod body 1321 and a stop collar 1323, the rod body 1321 includes a first end 13211 and a second end 13213 that are disposed opposite to each other, the first end 13211 is accommodated in the guide collar 131, the second end 13213 penetrates through the first guide plate 11, and the stop collar 1323 is sleeved with the second end 13213 to limit the moving distance of the first guide plate 11.

When the sample needle guiding mechanism 10 works, the sample needle 200 is mounted in the positioning hole 111, and the headspace bottle 300 is disposed in the sample box 50 and is disposed corresponding to the positioning hole 111; the sample injection needle 200 is pressed downwards, the pressure is transmitted to the first guide plate 11, the first guide plate 11 compresses the spring 134 and moves towards the sample box 50 along the sliding rod 132, the sample injection needle 200 moves towards the headspace bottle 300, the headspace bottle 300 is inserted, and the sample gas is extracted; after the sampling is finished, under the action of the deformation recovery of the spring 134, the sample injection needle 200 and the first guide plate 11 are reset, and the sample injection needle 200 is withdrawn from the headspace bottle 300.

It may be appreciated that the sample injection needle 200 may be pressed when pressed, or the sample injection needle 200 may be detachably fixed to the positioning hole 111, and the sample injection needle 200 may be pressed when pressed, or the first guide plate 11 may be pressed.

In one embodiment, by setting the length of the sliding rod 132, the stroke of the sample injection needle 200 is controlled, and thus the maximum moving distance of the sample injection needle 200 is controlled, and according to the maximum moving distance, the setting height of the headspace bottle 300 is set, so that the required needle insertion depth can be achieved when the sample injection needle 200 reaches the maximum moving distance. The needle insertion depth refers to the depth of the sample injection needle 200 into the headspace bottle 300.

In one embodiment, the sliding rod 132 may be provided with scales, the scales are set according to the headspace bottle 300 and the sampling amount of different specifications, and when the sample injection needle 200 is pressed down, the scales can be pressed to different scales according to the specifications and the sampling amount of the headspace bottle 300;

further, the needle-feeding guide set 13 may further include a lifting scale, where a scale may be disposed on the lifting scale, the lifting scale is disposed between the first guide plate 11 and the sample box 50, and the height of the lifting scale is adjusted according to the specification and the sampling amount of the headspace bottle 300, so that the pressing distance and the needle-feeding depth of the sample-feeding needle 200 may be controlled.

In an embodiment, please refer to fig. 6 and fig. 7 again, wherein fig. 6 is a schematic perspective assembly diagram of a headspace sampler provided by the present utility model, and fig. 7 is a schematic perspective assembly diagram of a sample needle guiding mechanism shown in fig. 6. The sample needle guiding mechanism 20 further includes a second guide plate 25 having a first through hole 251 and a depth adjusting member 26, where the second guide plate 25 and the first guide plate 21 are disposed at opposite intervals, the guide sleeve 231 is fixed on the second guide plate 25, and the first through hole 251 is disposed corresponding to the positioning hole 211 and is used for the sample needle 200 to penetrate.

Referring to fig. 7 and 8 in combination, a perspective assembly schematic view of the depth adjusting member shown in fig. 6 is shown. The depth adjusting member 26 includes a screw 263 and a lock catch 265, the lock catch 265 is disposed at one end of the screw 263 facing the second guide plate 25, the first guide plate 21 has a threaded hole 213 corresponding to the screw 263, the screw 263 penetrates through the threaded hole 213 and can rotate along the threaded hole 213 in a spiral manner, so as to change the distance between the first guide plate 21 and the lock catch 265, the second guide plate 25 has a lock hole 255 corresponding to the lock catch 265, and the lock catch 265 can freely penetrate through the lock hole 255 when rotating to a first direction and is in locking engagement with the lock hole 255 when rotating to a second direction.

Specifically, the locking hole 255 is configured as a long strip, the length of the first direction is greater than the length of the second direction, and the lock catch 265 is configured as a long strip, and when rotating to the first direction, the length of the lock catch in the first direction and the length of the lock catch in the second direction are both smaller than the locking hole 255, so that the lock catch can freely penetrate; when rotating to the second direction, the length of the lock catch 265 in the second direction is greater than the lock hole 255, and the lock catch 265 cannot be separated from the lock hole 255, so as to realize locking.

It will be appreciated that the depth adjuster 26 may be rotated by directly grasping the screw 263 or by grasping the lock 265.

Preferably, the depth adjusting member 26 further includes a knob 261, and the knob 261 is sleeved on the end of the screw 263 away from the lock catch 265. The knob 261 is used to facilitate rotation of the depth adjustment member 26.

Preferably, the depth adjusting member 26 further includes a connecting portion 264, the screw 263, the connecting portion 264 and the lock 265 are sequentially connected, the screw 263, the connecting portion 264 and the lock 265 may be in an integral structure, and the diameter of the connecting portion 264 is smaller than the diameter of the screw 263.

The sample needle guiding mechanism 20 works according to the following principle that the sample needle 200 is mounted in the positioning hole 211, and the headspace bottle 300 is disposed in the sample box 50 and is disposed corresponding to the positioning hole 211; the sample injection needle 200 is pressed downwards, the pressure is transmitted to the first guide plate 21, the first guide plate 21 compresses the spring 234, and moves towards the second guide plate 25 along the sliding rod 232, and simultaneously, the depth adjusting piece 26 also moves towards the lock hole 255; when the lock catch 265 passes through the lock hole 255 in the first direction, the depth adjusting member 26 is rotated to the second direction, so that the lock catch 265 is locked with the lock hole 255; at this time, the distance between the first guide plate 21 and the second guide plate 25 is determined by the distance between the lock catch 265 and the first guide plate 21. Therefore, the distance between the lock catch 265 and the first guide plate 21 can be adjusted by rotating the depth adjusting member 26, so as to control the moving distance of the first guide plate 21, thereby adjusting the moving distance and the sampling depth of the sampling needle 200.

Therefore, before sampling, after determining the needle insertion depth of the sample needle 200 according to the specification and the sampling amount of the headspace bottle 300, the depth adjusting member 26 is rotated to adjust the distance between the first guide plate 21 and the lock catch 265, so as to control the sample insertion depth of the sample needle 200. And after the lock catch 265 is locked and matched with the lock hole 255, the sample injection needle 200 can be stably kept at the required needle insertion depth for sampling. After the sampling is finished, the depth adjusting member 26 is rotated again to the first direction, the lock catch 265 is separated from the lock hole 255, and the first guide plate 21, the depth adjusting member 26 and the sample injection needle 200 recover to the initial position under the action of the recovery deformation of the spring 234, and wait for the next sample injection.

It will be appreciated that the first direction and the second direction are related to the shapes of the lock catch 265 and the lock hole 255, and may freely penetrate through the first direction when rotating, that is, the second direction may be locked, that is, without limitation, and preferably, an included angle between the first direction and the second direction is 90 degrees.

In an embodiment, please refer to fig. 9 again, which is a schematic perspective assembly diagram of a headspace injector according to another embodiment of the present utility model. The sample needle guiding machine 30 further comprises a second guiding plate 35 with a first through hole 351 and a depth adjusting piece 36, the second guiding plate 35 and the first guiding plate 31 are arranged at opposite intervals, the guiding sleeve 331 is fixed on the second guiding plate 35, and the first through hole 351 is arranged corresponding to the positioning hole 311 and is used for the sample needle 200 to penetrate.

The depth adjusting member 36 includes a screw rod 363 and a lock catch 365, the lock catch 365 is disposed at one end of the screw rod 363 facing the first guide plate 31, the second guide plate 35 has a threaded hole 353 corresponding to the screw rod 363, the screw rod 363 penetrates through the threaded hole 353 and can rotate helically along the threaded hole 353, so as to change the distance between the second guide plate 35 and the lock catch 365, the first guide plate 31 has a lock hole 315 corresponding to the lock catch 365, and the lock catch 365 can freely penetrate through the lock hole 315 when rotating to a first direction and is in locking engagement with the lock hole 315 when rotating to a second direction.

It will be appreciated that the depth adjustment member 36 may be rotated by directly grasping the threaded rod 363 or by grasping the shackle 365.

Preferably, the depth adjusting member 36 further includes a knob 361, and the knob 361 is sleeved on the end of the screw 363 away from the lock catch 365. The knob 361 is used to facilitate rotation of the depth adjuster 36.

Preferably, the depth adjusting member 36 further includes a connection portion 364, the screw 363, the connection portion 364 and the lock catch 365 are sequentially connected, the screw 363, the connection portion 364 and the lock catch 365 may be in an integral structure, and a diameter of the connection portion 364 is smaller than a diameter of the screw 363.

The operation principle of the needle guide mechanism 30 is similar to that of the needle guide mechanism 20, and will not be described herein.

Referring to fig. 1 and 2, the sample box 50 includes a housing 51, an upper cover 52 having a second through hole 521, a silica gel pad 53, a heat insulation board 54, a heating board 55, a vibrator 56 and a positioning member 57. The housing 51 and the upper cover 52 form a receiving space for receiving the silica gel pad 53, the heat insulation plate 54, the heating plate 55 and the positioning member 57. The guide sleeve 131 is fixed on the upper cover 52, and the silica gel pad 53 is stacked on the upper cover 52. The heat shield 54 is disposed along the housing 51 to cover the heating plate 55 and the positioning member 57. The heating plate 55 is disposed adjacent to the positioning member 57, and the head space 300 is mounted to the positioning member 57. The second through hole 521 is disposed corresponding to the positioning hole 111, and the positioning member 57 is disposed corresponding to the second through hole 521. The positioning member 57 positions the head space bottle 300 such that the injection needle 200 is perpendicular to the head space bottle 300, thereby ensuring that the head space bottle 300 is vertically inserted when the injection needle 200 is moved. The vibrator 56 is used for stirring the headspace bottle 300.

Specifically, the positioning member 57 may be a receiving cavity, so as to receive and limit the headspace bottle 300.

In another embodiment, the upper cover 52 and the second guide plate 25 are combined into the same cover plate, and the first through hole 251 and the second through hole 521 are the same through hole.

Compared with the prior art, the sample needle guide mechanism provided by the utility model has the advantages that the sample needle 200 is arranged in the positioning hole, the sliding rod guides the moving direction of the first guide plate and the sample needle 200, the moving direction of the sample needle 200 is kept constant, the sample needle 200 can be inserted into the headspace bottle 300 in a constant direction during insertion, and the spring provides a restoring force when sampling is finished, so that the first guide plate and the sample needle 200 reset along the sliding rod.

The depth adjusting piece is matched and locked with the first guide plate and the second guide plate, the sampling depth can be adjusted, and meanwhile sampling stability is kept.

While the utility model has been described with respect to the above embodiments, it should be noted that modifications can be made by those skilled in the art without departing from the inventive concept, and these are all within the scope of the utility model.

Claims

1. A sample needle guide mechanism, comprising:

the first guide plate is provided with a positioning hole, and the positioning hole is used for installing a sample injection needle;

the needle inlet guide group comprises a guide sleeve, a slide rod and a spring, wherein one end of the slide rod is contained in the guide sleeve, the other end of the slide rod penetrates through the first guide plate, and the spring is sleeved on the slide rod and is clamped between the guide sleeve and the first guide plate.

2. The needle guide mechanism of claim 1, wherein the slide bar comprises a bar body and a stop collar, the bar body comprises a first end and a second end which are oppositely arranged, the first end is accommodated in the guide collar, the second end penetrates through the first guide plate, and the stop collar is sleeved with the second end.

3. The needle guide mechanism of claim 1, further comprising a second guide plate having a first through hole, the second guide plate being disposed opposite to the first guide plate at a distance, the guide sleeve being fixed to the second guide plate, the first through hole being disposed corresponding to the positioning hole for the needle to pass through.

4. The sample needle guiding mechanism according to claim 3, further comprising a depth adjusting member, wherein the depth adjusting member comprises a screw and a lock catch, the lock catch is arranged at one end of the screw facing the second guiding plate, the first guiding plate is provided with a threaded hole corresponding to the screw, the screw penetrates through the threaded hole and can rotate spirally along the threaded hole so as to change the interval between the first guiding plate and the lock catch, the second guiding plate is provided with a lock hole corresponding to the lock catch, the lock catch can freely penetrate through the lock hole when rotating to a first direction, and the lock catch is in locking fit with the lock hole when rotating to a second direction.

5. The sample needle guiding mechanism according to claim 3, further comprising a depth adjusting member, wherein the depth adjusting member comprises a screw and a lock catch, the lock catch is arranged at one end of the screw facing the first guide plate, the second guide plate is provided with a threaded hole corresponding to the screw, the screw penetrates through the threaded hole and can rotate spirally along the threaded hole so as to change the interval between the second guide plate and the lock catch, the first guide plate is provided with a lock hole corresponding to the lock catch, the lock catch can freely penetrate through the lock hole when rotating to a first direction, and the lock catch is in locking fit with the lock hole when rotating to a second direction.

6. The needle guide mechanism of claim 4, wherein the depth adjustment member further comprises a knob, the knob being disposed about the threaded rod away from the locking end.

7. The needle guide mechanism of claim 4, wherein the depth adjustment member further comprises a connecting portion, the screw, the connecting portion, and the lock catch are sequentially connected, and a diameter of the connecting portion is smaller than a diameter of the screw.

8. The sample needle guide mechanism according to claim 1, wherein the guide sleeve has a stepped blind hole structure, the slide bar is arranged in abutting connection with the bottom surface of the stepped blind hole structure, and the spring is arranged in abutting connection with the step of the stepped blind hole structure.

9. The needle guide mechanism of claim 1, wherein the number of needle guide groups is four, the needle guide groups are arranged in a rectangular shape, and the number of positioning holes is a plurality of positioning holes.

10. The headspace sampler is characterized by comprising a sample needle guiding mechanism and a sample box, wherein the sample needle guiding mechanism is as claimed in any one of claims 1-9, the sample box is used for accommodating a headspace bottle, the sample box comprises an upper cover with a second through hole and a positioning piece, the guide sleeve is fixed on the upper cover, the second through hole is arranged corresponding to the positioning hole, and the positioning piece is arranged corresponding to the second through hole and is used for positioning the headspace bottle so that the sample needle is perpendicular to the headspace bottle.

11. The headspace sampler is characterized by comprising a sample needle guiding mechanism and a sample box, wherein the sample needle guiding mechanism is as claimed in any one of claims 3-7, the sample box is used for accommodating a headspace bottle, the sample box comprises an upper cover with a second through hole and a positioning piece, the guide sleeve is fixed on the upper cover, the second through hole is arranged corresponding to the positioning hole, the positioning piece is arranged corresponding to the second through hole and is used for positioning the headspace bottle, so that the sample needle is perpendicular to the headspace bottle, and the upper cover and the second guide plate are combined into the same cover plate.