GB2612704A

GB2612704A - Electric valve type sampler

Info

Publication number: GB2612704A
Application number: GB2216187.1A
Authority: GB
Inventors: Zhao Yanyan; Dang Juan; Chang Yi; Li Junxia; Fang Chungang; Liu Xijing; Che Yunfei; Su Zhengjun; Chen Baowei
Original assignee: Chinese Academy of Meteorological Sciences CAMS
Current assignee: Chinese Academy of Meteorological Sciences CAMS
Priority date: 2021-11-03
Filing date: 2022-11-01
Publication date: 2023-05-10
Anticipated expiration: 2042-11-01
Also published as: GB2612704B; CN216082225U; GB202216187D0

Abstract

An electric valve type sampler for automatic extraction of sample gas comprises a sampling cylinder 12 arranged on a carrier, a plunger arranged in the sampling cylinder 12 being movable in an axial direction of the sampling cylinder 12, and a driving mechanism arranged in the carrier configured for driving the plunger to move in the axial direction of the sampling cylinder 12. The sampling cylinder 12 may be made of quartz glass. The plunger may have a leather cup 18, a guide post 19, and a sealing fluid 23. The carrier may be a handheld carrier with a front end cap 16, a handle housing 1, and a connecting frame 14. The front end cap 16 may be provided with an opening 25 with a solenoid valve 17. The driving mechanism may have an electric lead screw assembly which comprises a lead screw assembly, a motor transmission assembly, a switch assembly, and a battery assembly.

Description

ELECTRIC VALVE TYPE SAMPLER

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of samplers, and in particular relates to an electric valve type sampler.

BACKGROUND

[0002] Laboratory studies in meteorology and other disciplines often encounter problems requiring the injection of reaction sample gas into reaction vessels. Usually, medical syringes or graduated manual extracting pumps are used to complete the sampling task.

[0003] However, the syringe is generally operated manually, which is poor in stability, and the human error may be caused by different operating habits of different personnel, making low sampling accuracy. Moreover, when the metal pump is used sometimes, the electrostatic adsorption may cause sample gas loss; and the syringe is not easy to seal, the opening of the syringe is free of sealing measures, and the sampling capacity of the syringe is limited.

SUN1MARY [0004] To this end, the present disclosure provides an electric valve type sampler. A plunger is driven by a driving mechanism to reciprocate within the sampling cylinder so as to facilitate automatic extraction of sample gas. The electric valve type sampler has characteristics, such as high sampling efficiency, high sampling stability and high sampling accuracy.

[0005] To achieve the objective above, the present disclosure provides the following technical solution: [0006] An electric valve type sampler includes: 100071 a carrier; [0008] a sampling cylinder arranged on the carrier; [0009] a plunger arranged in the sampling cylinder and being movable in an axial direction of the sampling cylinder; and [0010] a driving mechanism arranged in the carrier and configured for driving the plunger to move in the axial direction of the sampling cylinder.

[0011] In some embodiments, the sampling cylinder may be a sampling cylinder made of quartz glass.

[0012] In some embodiments, the plunger may include a leather cup and a guide post.

[0013] An outer peripheral wall of the guide post may be in fit with an inner peripheral wall of the sampling cylinder, a first end of the guide post may be connected to the leather cup, a second end of the guide post may be connected to a movable end of the driving mechanism, and an outer periphery of the leather cup may be in contact with and mate with the inner peripheral wall of the sampling cylinder.

[0014] In some embodiments, the leather cup may be a double-layer leather cup along an axial direction thereof [0015] In some embodiments, the plunger further includes: [0016] a sealing fluid provided in a gap between the double-layer leather cup along a circumferential direction and configured for being in contact with and mating with the inner peripheral wall of the sampling cylinder.

[0017] In some embodiments, the carrier may be a handheld carrier,and the driving mechanism may be arranged in the handheld carrier.

[0018] In some embodiments, the handheld carrier may include a front end cap, a handle housing, and a connecting frame.

[0019] A first end of the connecting frame may be connected to the front end cap, and a second end of the connecting frame may be connected to the handle housing; a first end of the sampling cylinder may be connected to the front end cap, a second end of the sampling cylinder may be connected to the handle housing, and the sampling cylinder may be supported by the connecting frame; the driving mechanism may be arranged in the handle housing, and a control switch of the driving mechanism may be located outside the handle housing.

[0020] In some embodiments, the front end cap may be provided with an opening communicating with the first end of the sampling cylinder.

[0021] The electric valve type sampler further includes.

[0022] a solenoid valve arranged in the front end cap and configured for controlling the opening to be opened and closed [0023] In some embodiments, the driving mechanism may include an electric lead screw assembly. [0024] In some embodiments, the electric lead screw assembly may include a lead screw assembly, a motor transmission assembly, a switch assembly, and a battery assembly.

[0025] The lead screw assembly may include a lead screw and a nut; the nut may be arranged in the handle housing, a first end of the lead screw penetrates through the second end of the sampling cylinder and may be located in the sampling cylinder to be connected to the plunger, a second end of the lead screw may be located outside the handle housing, and a middle portion of the lead screw may be meshed with the nut; the motor transmission assembly may be arranged in the handle housing and may be configured for driving the nut to rotate; the switch assembly may be arranged outside the handle housing and may be electrically connected to the motor transmission assembly, and the battery assembly may be arranged on the handle housing and may be electrically connected to the motor transmission assembly and the switch assembly.

[0026] It can be known from the technical solution above that, in accordance with an electric valve type sampler provided by the present disclosure, a plunger is driven by a driving mechanism to reciprocate within the sampling cylinder so as to facilitate automatic extraction of sample gas. The electric valve type sampler has characteristics, such as high sampling efficiency, high sampling stability and high sampling accuracy.

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To describe the technical solutions in the embodiments of the present disclosure or in the prior art more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following description show merely some embodiments of the present disclosure, and those of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts. [0028] FIG. 1 is a structural schematic diagram of an electric valve type sampler in accordance with an embodiment of the present disclosure.

[0029] FIG. 2 is a schematic diagram of transmission of a lead screw assembly in accordance with an embodiment of the present disclosure; [0030] FIG. 3 is a structural structure diagram of a lead screw in accordance with an embodiment of the present disclosure; [0031] FIG. 4 is a structural structure diagram of a lead screw positioning sleeve in accordance with an embodiment of the present disclosure.

[0032] In the drawings: I handle housing; 2 lithium battery; 3 switch; 4 changeover switch; 5 speed reducer housing; 6 direct current motor; 7 driving gear; 8 driven gear train; 9 lead screw (stainless steel multi-start lead screw); 10 rear connector assembly; 11 first connecting transition threaded sleeve; 12 sampling cylinder (of which main body is a quartz glass cylinder), 13 scale line; 14 connecting frame; 15 connecting block; 16 front end cap; 17 solenoid valve; 18 leather cup (watertight leather cup); 19 guide post; 20 lock nut; 21 multi-start nut; 22 second connection transition threaded sleeve; 23 sealing fluid; 24 sampling interface; 25 opening; 26 nut; 27 bronze sleeve bearing; 28 reduction gearbox body; 29 lead screw positioning sleeve.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The following clearly and completely describes the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely a part rather than all of the embodiments of the present disclosure. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

[0034] An electric valve type sampler in accordance with an embodiment of the present disclosure is as shown in FIG. 1 and comprises: 100351 a carrier; 100361 a sampling cylinder 12 arranged on the carrier; [0037] a plunger arranged in the sampling cylinder 12 and capable of moving in an axial direction of the sampling cylinder 12; and 100381 a driving mechanism arranged in the carrier and configured for driving the plunger to move in the axial direction of the sampling cylinder 12.

[0039] It is noted that the carrier, as a frame main body of the sampler, is configured to install the sampling cylinder 12 and the driving mechanism. In addition, an outer wall of the sampling cylinder 12 is provided with scale lines 13, and a first end of the sampling cylinder 12 (aright end of the sampling cylinder 12 in FIG. 1) is of an open structure and serves as a sampling end of the sampling cylinder 12. Furthermore, the plunger is capable of reciprocating in an axial direction of the sampling cylinder 12, thus the sample gas can be pumped in and out conveniently. Certainly, as shown in FIG. 1, the driving mechanism is located on one side where a second end of the sampling cylinder 12 (a left end of the sampling cylinder 12 in FIG. 1) is located, thus facilitating the reciprocating motion of the plunger better.

[0040] It can be known from the technical embodiment above that, with an electric valve type sampler provided by the present disclosure, a plunger is driven by a driving mechanism to reciprocate within the sampling cylinder so as to facilitate automatic extraction of sample gas. The electric valve type sampler has characteristics, such as high sampling efficiency, high sampling stability and high sampling accuracy.

[0041] In the embodiment, the sampling cylinder 12 is a sampling cylinder made of quartz glass. Thus, the structural strength of the sampling cylinder 12 is guaranteed, making the sampling cylinder hard to be damaged, and the electrostatic adsorption on the cylinder wall can be avoided, thus facilitating to eliminate the problem of inaccurate sample gas quantification due to electrostatic adsorption on the cylinder wall.

[0042] Specifically, as shown in FIG. 1, the plunger comprises a leather cup 18 and a guide post 19.

100431 An outer peripheral wall of the guide post 19 is in fit with an inner peripheral wall of the sampling cylinder 12, a first end of the guide post 19 is connected to the leather cup 18, and a second end of the guide post is connected to a movable end of the driving mechanism, facilitating to guide the reciprocating motion of the leather cup 18 within the sampling cylinder 12, such that the reciprocating motion of the leather cup 18 is more stable and smoother. The outer periphery of the leather cup 18 is in contact with and mates with the inner peripheral wall of the sampling cylinder 12 such that the dynamic sealing effect is achieved between the outer periphery of the leather cup 18 and the inner peripheral wall of the sampling cylinder 12, thus ensuring the sealing at a working area of the sampling cylinder 12. That is, the plunger of the embodiment designed in such a way has the characteristics, such as simple structure, smooth motion, and good sealing. [0044] Further, in order to achieve better sealing effect of the leather cup 18, a design of multi-layer sealing structure is required. Accordingly, as shown in FIG. 1, the leather cup 18 is a double-layer leather cup along an axial direction thereof, and thus the sealing at the working area of the sampling cylinder 12 can be further guaranteed.

[0045] Furthermore, as the sampling cylinder 12 is a glass product and the leather cup is sealed and reciprocates with respect to the sampling cylinder 12, the outer periphery of the skin bowl cannot be too large, thus there is a gap between the double-layer leather cup. In order to enhance the sealing effect of the double-layer leather cup, correspondingly, as shown in FIG. 1, the plunger further comprises: 100461 a sealing fluid 23 provided in a gap between the double-layer leather cup along a circumferential direction and configured for being in contact with and mating with the inner peripheral wall of the sampling cylinder 12. The sealing fluid employs a fluid with high surface tension. More specifically, the sealing fluid 23 is made by mixing di stilled water and organic grease with high surface tension and lubricating effect.

100471 In the embodiment, in order to achieve the convenient sampling of the sampler, the sampler needs to be provided with a main body (a carrier) convenient for hand holding and carrying. Accordingly, the carrier in the embodiment is a handheld carrier, and the driving mechanism is arranged in the handheld carrier.

100481 Specifically, as shown in FIG.1, the handheld carrier comprises a front end cap 16, a handle housing 1, and a connecting frame 14.

[0049] The first end of the connecting frame 14 (the right end of the connecting frame 14 in FIG. 1) is connected to the front end cap 16, the second end of the connecting frame (the left end of the connecting frame 14 in FIG. 1) is connected to the handle housing L The first end of the sampling cylinder 12 is connected to the front end cap 16, the second end of the sampling cylinder is connected to the handle housing 1, and the sampling cylinder is supported by the connecting frame 14, that is, the connecting frame 14 is configured for supporting the sampling cylinder 12. The embodiment is designed in such a may that the hand-held structural connection of the sampler is more robust.That is, as shown in FIG. 1, the structure of the sampler of the solution is a pistol type structure facilitating sampling and carrying. The driving mechanism is arranged within the handle housing 1, and a control switch of the driving mechanism is located outside the handle housing 1. Thus, the manipulation of the sampling process is facilitated. The connection between the connecting frame 14 and the two ends of the sampling cylinder 12 can be made with reference to connection structures of corresponding components in FIG. 1 and will not be repeated here.

[0050] Furthermore, as shown in FIG. 1, the front end cap 16 is provided with an opening 25 communicating with the first end of the sampling cylinder 12.

100511 The electric valve type sampler in accordance with an embodiment of the present disclosure further comprises: [0052] a solenoid valve 17 arranged in the front end cap 16 and configured for controlling the opening 25 to be opened and closed. In a normal state, the solenoid valve 17 is configured to control the opening 25 to be in a closed state. Thus, the sample gas in the working area is isolated from the external environment, the sample gas in the working area is prevented from leaking, and the sample gas is free of contamination or spillage. Specifically, as shown in FIG. 1, the inlet/outlet end of the solenoid valve 17 is connected into the opening 25 of the front end cap 16. In addition, the outer end surface of the front end cap 16 is further provided with a sampling interface 24 communicating with the opening 25 and suitable for gas inlet pipes of different sizes.

[0053] To further optimize the above embodiment, the driving mechanism comprises an electric lead screw assembly. That is, in the embodiment, the plunger is driven by an electric lead screw to move, such that the plunger can move smoother and more reliable, and thus the purpose of accurate sampling of the sampler can be achieved. Certainly, the driving mechanism in the embodiment may employ other forms of driving mechanisms, such as a linear actuator mechanism. Furthermore, a power mode of the driving mechanism is not limited to electric driving, but also pneumatic and hydraulic driving.

100541 Specifically, the electric lead screw assembly comprises a lead screw assembly, a motor transmission assembly, a switch assembly, and a battery assembly.

[0055] As shown in FIG. 1, the lead screw assembly comprises a lead screw 9 and a nut 26. The nut 26 is arranged in the handle housing 1. The first end of the lead screw 9 penetrates through the second end of the sampling cylinder 12 and is located in the sampling cylinder 12 to be connected to the plunger. As shown in FIG. 1, the second end of the guide post 19 (the left end of the guide post 19 in FIG. 1) is provided with a groove. A multi-start nut 21 is arranged in the groove and is threaded to the first end of the lead screw 9; then the multi-start nut 21 is fixed into the groove by a lock nut 20 to achieve the connection between the first end of the lead screw 9 and the plunger (guide post 19). That is, the lock nut 20 is connected to the guide post 19 and is configured to lock the multi-start nut 21 at the front end of the lead screw 9. The multi-start nut 21 is configured to lock the lead screw 9. The second end of the lead screw 9 is located outside the handle housing 1, and the middle part of the lead screw is meshed with the nut 26.

[0056] The motor transmission assembly is located in the handle housing 1 and is configured to drive the nut 26 to rotate. As shown in FIG. 1, the motor transmission assembly comprises a direct current motor 6, a driving gear 7, a driven gear train 8 and other components, and these components are fitted with one another in a manner shown in FIG. 1 and FIG. 2. The direct current motor odrivesthe gear to engage to make the driven gear train 8 drive the nut 26 to rotate, through the cooperation of the nut 26 and the lead screw 9, thereby achieving the reciprocating motion (left-right motion in FIG. 1) of the plunger pushed by the lead screw 9. Certainly, the lead screw 9 in the embodiment can only make linear reciprocating motion without auto rotation. In the embodiment, a rotation-stopping structure in fit with the lead screw 9i s provided to prevent the nut 26 from driving the lead screw 9 to auto rotate, thus ensuring the linear motion of the lead screw 9. Specifically, as shown in FIG. 2, the rotation-stopping structure is a lead screw positioning sleeve 29 arranged on a gearbox body 28 and configured to be in fit with the lead screw 9for rotation-stopping. The structure of the lead screw 9 can be made reference to FIG. 3, the structure of the lead screw positioning sleeve 29 can be made reference to FIG. 4, and the rotation-stopping purpose of the lead screw 9 is achieved through the fitting of the inner and outer polygonal surfaces of the lead screw and the lead screw positioning sleeve.

[0057] The switch assembly is located outside the handle housing I and is electrically connected to the motor transmission assembly. As shown in FIG. 1, the switch assembly comprises a switch 3 and a change-over switch 4 located outside the handle housing 1. The battery assembly is arranged in the handle housing 1 and is electrically connected to the motor transmission assembly and the switch assembly. Certainly, the battery assembly may be a lithium battery 2 arranged at the bottom of the handle housing.

[0058] The embodiment is further introduced below with reference to the specific embodiments: [0059] Laboratory studies in meteorology and other disciplines often encounter problems requiring the injection of reaction sample gas into reaction vessels. When the sample gas volume is small and the accuracy requirement is low, the injection is often with the help of some existing medical syringes or off-the-shelf syringes for other applications, such as 100 ml medical glass syringes, etc. However, such finished products are often fixed in volume and hard to seal, manual operation makes the accuracy control difficult, improper operation is easy to cause the damage of the syringes and potential safety hazards. If the syringes are metal-based syringes, there may also be problems such as inaccurate sample gas quantitation due to electrostatic adsorption on the sampler wall.

100601 To solve the problem above, the present disclosure designs a non-metallic experimental gas sampler which is electrically controlled, good in sealing performance and has a certain volume (capable of satisfying usual experimental requirements).

100611 The electric valve type sampler designed by the present disclosure is an introduction device for laboratory gas samples as well as detection assay standard gases.

100621 The technical solution of the present disclosure is as follows: 100631 The main function of the mechanism is that an outer cylinder (i.e., the sampling cylinder, the same below) is made of quartz glass, and the inside of the outer cylinder is a plunger leather cup made of polyester or leather(i.e., the plunger, the same below), the plunger leather cup reciprocates so as to achieve the pump-in and pump-out of the sample.

100641 The outer cylinder is made of quartz glass and is marked with scale lines and corresponding Arabic numerals according to the calibration.

[0065] The plunger leather cup is a reciprocating motion component for the sampler to ensure that the working area is sealed and the sample is free of contamination and spillage.

[0066] The sealing principle of the plunger leather cup is that the plunger leather cup is composed of a guide post and a double-layer leather cup. The guide post mainly plays a role in stabilizing the leather cup in the process of moving in the cylinder to make the leather cup move smoothly and plays a role in connecting a power component (e.g., a lead screw assembly). The double-layer leather cup is composed of double layers filled with the fluid with high surface tension. As the outer cylinder is a glass product which moves accordingly with respect to the inner leather cup for sealing, the leather cup should be soft, small, and low in elasticity, and the fluid with the high surface tension is used to make up.

[0067] The power for the electric valve type sampler is that the power supply is a chargeable lithium battery for driving a gear motor and driving the lead screw to push the plunger leather cup to make reciprocating motion.

[0068] A normally-closed solenoid valve is arranged at the opening and acts as an isolation from the outside, such that the samples in the working area are prevented from being contaminated and leaking, the working area is maintained at the set pressure and is free from leakage caused by the change of the external pressure.

[0069] The electric valve type sampler is a portable and easy-to-operate air pressure holder for laboratory sample collection and air source.

[0070] The application of the electric valve sampler is that the sampler is a device for collecting and preserving the laboratory gas or liquid samples, and may also serve as an air source for the air pressure detection (meteorology and other majors).

[0071] The key point and the points to be protected of the present disclosure are as follows: [0072] In the design, the outer cylinder is made of quartz glass to avoid electrostatic adsorption; the plunger leather cup is made of a guide post and a double-layer leather cup; the outer cylinder and the inner leather cup are in relative movement and kept sealing; and the guide post is configured to ensure the smooth motion of the leather cup and connect a power component. The double-layer leather cup plays a better sealing role. The solenoid valve at the inlet and out plays a role in isolating the sample gas from the outside.

[0073] The various embodiments in the specification are described in a progressive manner, the differences from other embodiments are illustrated in each embodiment, and reference can be made to other embodiments for understanding the same or similar parts of the embodiments. [0074] The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the present disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

WHAT IS CLAIMED IS: 1. An electric valve type sampler, comprising: a carrier; a sampling cylinder (12) arranged on the carrier; a plunger arranged in the sampling cylinder (12) and being movable in an axial direction of the sampling cylinder (12); and a driving mechanism arranged in the carrier and configured for driving the plunger to move in the axial direction of the sampling cylinder (12).
2. The electric valve type sampler according to claim 1, wherein the sampling cylinder (12) is a sampling cylinder made of quartz glass.
3. The electric valve type sampler according to claim 1, wherein the plunger comprises a leather cup (18) and a guide post(19); an outer peripheral wall of the guide post (19) is in fit with an inner peripheral wall of the sampling cylinder (12), a first end of the guide post (19) is connected to the leather cup (18), a second end of the guide post is connected to a movable end of the driving mechanism, and an outer periphery of the leather cup (18) is in contact with and mates with the inner peripheral wall of the sampling cylinder (12).
4. The electric valve type sampler according to claim 3, wherein the leather cup (18) is a double-layer leather cup along an axial direction thereof
5. The electric valve type sampler according to claim 4, wherein the plunger further comprises: A sealing fluid (23) provided in a gap between the double-layer leather cup along a circumferential direction and configured for being in contact with and mating with the inner peripheral wall of the sampling cylinder (12).
6. The electric valve type sampler according to claim 1, wherein the carrier is a handheld carrier, and the driving mechanism is arranged in the handheld carrier.
7. The electric valve type sampler according to claim 6, wherein the handheld carrier comprises a front end cap (16), a handle housing (1), and a connecting frame (14); a first end of the connecting frame (14) is connected to the front end cap (16), and a second end of the connecting frame is connected to the handle housing (1); a first end of the sampling cylinder (12) is connected to the front end cap (16), a second end of the sampling cylinder is connected to the handle housing (1), and the sampling cylinder is supported by the connecting frame (14); the driving mechanism is arranged in the handle housing (1), and a control switch of the driving mechanism is located outside the handle housing (1).
8. The electric valve type sampler according to claim 7, wherein the front end cap (16) is provided with an opening (25) communicating with the first end of the sampling cylinder (12); the electric valve type sampler further comprises: a solenoid valve (17) arranged in the front end cap (16) and configured for controlling the opening (25) to be opened and closed.
9. The electric valve type sampler according to claim 7, wherein the driving mechanism comprises an electric lead screw assembly.
10. The electric valve type sampler according to claim 9, wherein the electric lead screw assembly comprises a lead screw assembly, a motor transmission assembly, a switch assembly, and a battery assembly; the lead screw assembly comprises a lead screw (9) and a nut (26); the nut (26) is arranged in the handle housing (1); a first end of the lead screw (9) penetrates through the second end of the sampling cylinder (12) and is located in the sampling cylinder (12) to be connected to the plunger, a second end of the lead screw is located outside the handle housing (1), and a middle portion of the lead screw is meshed with the nut (26); the motor transmission assembly is arranged in the handle housing (1) and is configured for driving the nut (26) to rotate; the switch assembly is arranged outside the handle housing (1) and is electrically connected to the motor transmission assembly; and the battery assembly is arranged on the handle housing (I) and is electrically connected to the motor transmission assembly and the switch assembly.