Sampling device and sampling method for ortho-parahydrogen concentration analysis

Abstract

The invention provides a sampling device and a sampling method for ortho-parahydrogen concentration analysis, and belongs to the technical field of new energy, the sampling device comprises a tank body, an inflation valve and an intermittent exhaust assembly; wherein the inflation valve is communicated with one end of the tank body, the intermittent exhaust assembly is arranged on the tank body, and the intermittent exhaust assembly enables gas in the tank body to be intermittently exhausted from the two ends of the tank body; the intermittent exhaust assembly comprises exhaust heads arranged at the two ends of the tank body, an exhaust valve element and an exhaust control component. According to the sampling device for ortho-parahydrogen concentration analysis, the intermittent exhaust assembly intermittently exhausts air at the two ends of the tank body, so that air at the end part and the edge part of the tank body is easy to exhaust, and the exhaust efficiency of the air is improved; the intermittent exhaust mode is beneficial to generating turbulent flow in the tank body, cleaning impurities on the inner wall of the tank body and discharging the impurities out of the tank body.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a sampling device and a sampling method for ortho-parahydrogen concentration analysis. Background Art

[0002] As a clean and efficient new energy source, hydrogen energy is flexible, efficient, clean, low-carbon and has wide applications. It is very important to ensure the concentration of hydrogen during its use. Hydrogen with impure concentration is prone to accidents when used, posing a safety hazard.

[0003] In the prior art, when filling a sampling container with hydrogen, excessive hydrogen is filled into the container multiple times over a long period of time to exhaust the original air in the container as much as possible, so as to reduce the impact on the sample being sampled. However, since the container is generally deep, it is difficult for all the gas in the container to flow out, and the long-term use of the container is prone to impurities on the inner wall of the container, which may affect the sample being sampled.

[0004] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0005] Based on this, it is necessary to provide a sampling device and a sampling method for ortho-parahydrogen concentration analysis to address the problems existing in the current hydrogen sampling device, so as to solve the problem that the existing hydrogen sampling device is difficult to exhaust the air in the sampling container.

[0006] The above purpose is achieved through the following technical solutions:

[0007] A sampling device for ortho-parahydrogen concentration analysis, comprising a tank, an air filling valve and an intermittent exhaust assembly;

[0008] Wherein, the inflation valve is connected to one end of the tank body, the intermittent exhaust assembly is arranged on the tank body, and the intermittent exhaust assembly can make the gas in the tank body be discharged intermittently from both ends of the tank body;

[0009] The intermittent exhaust assembly includes an exhaust head, an exhaust valve core and an exhaust control component arranged at both ends of the tank body;

[0010] Wherein, the exhaust head is connected to the interior of the tank;

[0011] The exhaust valve core is slidably disposed inside the exhaust head, and the exhaust valve core is configured to connect the tank body with the exhaust head when in a first position, and to close the tank body with the exhaust head when in a second position;

[0012] The exhaust control component is arranged on the tank body and connected to the exhaust valve core. The exhaust control component can drive the exhaust valve core to switch between the first position and the second position.

[0013] Preferably, the exhaust valve core has an exhaust flow channel, a branch flow channel and an intake flow channel inside;

[0014] Wherein, one end of the exhaust flow channel is connected to an end of the exhaust valve core away from the tank body, the other end of the exhaust flow channel is arranged inside the exhaust valve core, and the outlet end of the exhaust flow channel is a contraction structure;

[0015] One end of the branch flow channel is in communication with the middle of the exhaust flow channel, and the other end of the branch flow channel is in communication with the side wall of the exhaust valve core. When the exhaust valve core is in the first position, the other end of the branch flow channel can be in communication with the exhaust control component.

[0016] One end of the intake channel is connected to the middle of the exhaust channel, and the other end of the intake channel is connected to an end of the exhaust valve core close to the tank body;

[0017] A baffle is fixedly connected to one end of the exhaust valve core close to the tank body, and the baffle is used to make the joint between the tank body and the exhaust head conductive or closed.

[0018] Preferably, the exhaust control component includes a limit box, a magnet and two sliders;

[0019] Wherein, the limit box is arranged on the top of the tank body, and the extending direction of the limit box is the same as the extending direction of the tank body;

[0020] The magnet is fixedly arranged inside the limit box;

[0021] Both ends of the limit box are provided with a pressure chamber and a sliding chamber, the pressure chamber and the sliding chamber are connected, the pressure chamber is located between the magnet and the sliding chamber, the pressure chamber is connected with the side wall of the exhaust valve core through a branch pipe, when the exhaust valve core is in the first position, the pressure chamber can be connected with the branch flow channel, and the limit box has a pressure relief structure;

[0022] The two sliders are respectively slidably arranged in the two sliding chambers, the sliders are magnetic, one end of the slider close to the magnet has a polarity opposite to that of the magnet, and the slider is fixedly connected to the exhaust valve core through a connecting rod.

[0023] Preferably, the magnet is an electromagnet, and a switch is provided on the limit box, and the switch can control the electromagnet to be energized.

[0024] Preferably, a limit plate is provided between the pressure chamber and the sliding chamber, the limit plate is fixedly connected to the limit box, a first through hole is provided in the middle of the limit plate, and the first through hole is used to connect the pressure chamber and the sliding chamber.

[0025] Preferably, two ends of the limit box have second through holes, and the second through holes are communicated with the sliding chamber.

[0026] Preferably, the top of the exhaust head and the bottom of the limit box having a partial structure of the sliding chamber are both provided with a sliding groove, and the two ends of the connecting rod are respectively fixedly connected to the bottom of the sliding block and the top of the exhaust valve core, and the sliding groove is used for the connecting rod to give way during the movement; the pressure relief structure includes the sliding groove on the limit box.

[0027] Preferably, the baffle is fixedly connected to the exhaust valve core via a connecting column, a retaining ring is fixedly provided at the joint between the tank body and the exhaust head, the diameter of the connecting column is smaller than the inner diameter of the retaining ring, and the diameter of the baffle is larger than the inner diameter of the retaining ring.

[0028] Preferably, the exhaust head is located at the center of the end of the tank body.

[0029] A sampling method for analyzing the concentration of normal parahydrogen, the method is applied to the sampling device for analyzing the concentration of normal parahydrogen, and the method comprises the following steps:

[0030] Filling hydrogen into the tank through the filling valve;

[0031] When the pressure in the tank body increases, the exhaust control component drives the exhaust valve core to switch between the first position and the second position, and the two ends of the tank body intermittently discharge the original air in the tank body and the impurities on the inner wall of the tank body;

[0032] After the original air in the tank is exhausted, the inflation valve is closed, and the exhaust control component or manual control locks the exhaust valve core in the second position.

[0033] The beneficial effects of the present invention are:

[0034] In the sampling device for ortho-parahydrogen concentration analysis of the present invention, the intermittent exhaust component can exhaust air from both ends of the tank body through intermittent exhaust, so that the air at the end and edge of the tank body can be easily discharged, thereby improving the air exhaust efficiency; compared with the single-side exhaust solution in the prior art, both ends of the tank body of the present invention can be exhausted, which can balance the reaction force generated by the high-pressure gas discharge of the sampling device; the intermittent exhaust method is conducive to generating turbulence inside the tank body, which is conducive to cleaning impurities on the inner wall of the tank body and discharging the impurities out of the tank body. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of a sampling device for analyzing the concentration of normal parahydrogen according to an embodiment of the present invention;

[0036] Figure 2 A front view of a sampling device for analyzing the concentration of normal parahydrogen according to an embodiment of the present invention;

[0037] Figure 3 It is a left side view of a sampling device for analyzing the concentration of normal parahydrogen according to an embodiment of the present invention;

[0038] Figure 4 For the present invention Figure 3 Sectional view at AA;

[0039] Figure 5 For the present invention Figure 4 A schematic diagram of the structure in which the middle exhaust valve core is located in the second position;

[0040] Figure 6 For the present invention Figure 4 A partial enlarged view of point B in the middle;

[0041] Figure 7 For the present invention Figure 5 A partial enlarged view of point C in the middle;

[0042] Figure 8 FIG. 4 is a flow chart of a sampling method for analyzing the concentration of ortho-parahydrogen according to another embodiment of the present invention.

[0043] in:

[0044] 100, tank body; 101, exhaust head; 200, charging valve; 300, exhaust control component; 301, switch; 302, magnet; 303, slider; 304, exhaust valve core; 3041, exhaust flow channel; 3042, branch flow channel; 3043, intake flow channel; 3044, baffle; 305, branch pipe; 306, connecting rod; 307, limit box; 308, slide groove. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0046] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] In one aspect, an embodiment of the present invention provides a sampling device for analyzing the concentration of normal parahydrogen, hereinafter referred to as the sampling device, with reference to Figures 1 to 3 The sampling device includes a tank body 100, an air filling valve 200 and an intermittent exhaust assembly. The air filling valve 200 is connected to one end of the tank body 100, and the intermittent exhaust assembly is arranged on the tank body 100. The intermittent exhaust assembly can make the gas in the tank body 100 be discharged intermittently from both ends of the tank body 100; the intermittent exhaust assembly includes an exhaust head 101, an exhaust valve core 304 and an exhaust control component 300 arranged at both ends of the tank body 100.

[0049] Specifically in this embodiment, the tank body 100 has a certain height or depth, and the inflation valve 200 is a one-way valve. The inflation valve 200 is a prior art and will not be described in detail here. The inflation pipe can be connected to the inflation valve 200 to fill hydrogen into the tank body 100. When the tank body 100 is filled with hydrogen, the inflation pipe can be unplugged.

[0050] During the inflation process, the intermittent exhaust assembly exhausts air intermittently, so that air can be exhausted from both ends of the tank body 100, making it easy to exhaust the air at the ends and edges of the tank body 100, thereby improving the exhaust efficiency of the air, which is equivalent to halving the depth of the tank body 100; compared with the unilateral exhaust scheme in the prior art, both ends of the tank body 100 of this embodiment can be exhausted, which can balance the reaction force generated by the high-pressure gas exhaust of the sampling device; the intermittent exhaust method is conducive to generating turbulence inside the tank body 100, which is conducive to cleaning impurities on the inner wall of the tank body 100 and discharging the impurities out of the tank body 100. It should be noted that the sampling device of this embodiment can be used not only in the sampling of hydrogen, but also in the sampling of gases such as oxygen, helium and carbon dioxide.

[0051] In the intermittent exhaust assembly, the exhaust head 101 is connected to the interior of the tank body 100, and the exhaust head 101 has a vent at one end away from the tank body 100; the exhaust valve core 304 is slidably arranged inside the exhaust head 101, and the exhaust valve core 304 is configured to connect the tank body 100 and the exhaust head 101 when in a first position, and to close the tank body 100 and the exhaust head 101 when in a second position; the exhaust control component 300 is arranged on the tank body 100 and connected to the exhaust valve core 304, and the exhaust control component 300 can drive the exhaust valve core 304 to switch between the first position and the second position.

[0052] Specifically, refer to Figure 4 and Figure 5 In the process of filling hydrogen into the tank body 100, the exhaust control component 300 drives the exhaust valve core 304 to slide back and forth in the exhaust head 101 under the action of air pressure and external force. When the exhaust valve core 304 is at a position close to the tank body 100, i.e., the first position, the air in the tank body 100 can be discharged from the exhaust head 101. When the exhaust valve core 304 is at a position far away from the tank body 100, i.e., the second position, the exhaust valve core 304 blocks the exhaust head 101 to prevent the air in the tank body 100 from being discharged from the exhaust head 101. This cycle is repeated to discharge the air in the tank body 100.

[0053] In some embodiments, reference Figure 6 The exhaust valve core 304 has an exhaust flow channel 3041, a branch flow channel 3042 and an intake flow channel 3043. The exhaust flow channel 3041 can be arranged along the axis of the exhaust valve core 304, and the branch flow channel 3042 and the intake flow channel 3043 can be arranged at an angle to the axis of the exhaust valve core 304. The branch flow channel 3042 and the intake flow channel 3043 are connected in the middle of the exhaust flow channel 3041.

[0054] Specifically, one end of the exhaust channel 3041 is connected to one end of the exhaust valve core 304 away from the tank body 100, and the other end of the exhaust channel 3041 is arranged inside the exhaust valve core 304. The outlet end of the exhaust channel 3041 is a contraction structure, and the air in the tank body 100 is discharged through the exhaust channel 3041. The contraction structure can increase the pressure of the gas passing through the outlet end of the exhaust channel 3041, thereby preventing excessive gas from being discharged from the exhaust channel 3041 during the exhaust process.

[0055] One end of the branch channel 3042 is in communication with the middle of the exhaust channel 3041, and the other end of the branch channel 3042 is in communication with the side wall of the exhaust valve core 304. When the exhaust valve core 304 is in the first position, the other end of the branch channel 3042 can be in communication with the exhaust control component 300. One end of the intake channel 3043 is in communication with the middle of the exhaust channel 3041, and the other end of the intake channel 3043 is in communication with one end of the exhaust valve core 304 close to the tank body 100.

[0056] A baffle 3044 is fixedly connected to one end of the exhaust valve core 304 close to the tank body 100 , and the baffle 3044 is used to make the joint between the tank body 100 and the exhaust head 101 conductive or closed.

[0057] In some embodiments, reference Figure 3 and Figure 4 The exhaust control component 300 includes a limit box 307, a magnet 302 and two sliders 303. The limit box 307 is arranged on the top of the tank body 100, and the extension direction of the limit box 307 is the same as the extension direction of the tank body 100. The cross section of the limit box 307 is square or circular. The magnet 302 is fixedly arranged inside the limit box 307, and the outer contour of the magnet 302 is in close contact with the inner wall of the limit box 307.

[0058] A pressure chamber and a sliding chamber are provided at both ends of the limit box 307. The pressure chamber and the sliding chamber are connected. The pressure chamber is located between the magnet 302 and the sliding chamber. The pressure chamber is connected to the side wall of the exhaust valve core 304 through the branch pipe 305. When the exhaust valve core 304 is in the first position, the pressure chamber can be connected to the branch flow channel 3042. The limit box 307 has a pressure relief structure. Specifically, the pressure relief structure is located on the side wall of the sliding chamber. Two sliders 303 are respectively slidably arranged in the two sliding chambers. The sliders 303 are magnetic. The end of the slider 303 close to the magnet 302 has an opposite polarity to the magnet 302. The slider 303 is fixedly connected to the exhaust valve core 304 through a connecting rod 306. Refer to Figure 4 For example, the left end of the magnet 302 is an N pole and the right end is an S pole, the right end of the slider 303 at the left end of the magnet 302 is an S pole and the left end is an N pole, and the right end of the slider 303 at the right end of the magnet 302 is an S pole and the left end is an N pole.

[0059] In this embodiment, under the action of magnetic force, the magnet 302 can attract the slider 303 to move to the end of the sliding chamber close to the magnet 302. In this process, the slider 303 drives the exhaust valve core 304 to move to the first position. The high-pressure gas inside the tank body 100 is divided into two paths. One path of gas is discharged to the outside of the tank body 100 through the exhaust flow channel 3041, and the other path of gas enters the pressure chamber through the branch flow channel 3042 and the branch pipe 305, so that the air pressure in the pressure chamber increases. Since the pressure chamber and the sliding chamber are connected, as the air pressure in the pressure chamber gradually increases to a value greater than the magnetic force exerted on the slider 303, the high-pressure gas pushes the slider 303 to slide to the end of the sliding chamber away from the magnet 302. In this process, the slider 303 drives the exhaust valve core 304 to move to the second position through the connecting rod 306, and the tank body 100 stops exhausting. The pressure in the pressure chamber will leak out through the pressure relief structure, so that the pressure gradually decreases. When the pressure in the pressure chamber is less than the magnetic force on the slider 303, the slider 303 moves to the end of the sliding chamber close to the magnet 302. This cycle is repeated to achieve the effect of intermittent exhaust. When the tank body 100 is filled with hydrogen, the connecting rod 306 can be manually fixed at the end away from the tank body 100 to maintain the sealing of the tank body 100.

[0060] In some embodiments, the magnet 302 is an electromagnet, and a switch 301 is provided on the limit box 307. The switch 301 can control the power supply of the electromagnet. The magnetic strength of the electromagnet can be changed by changing the current, and the polarity of the electromagnet can be changed by changing the current direction. The switch 301 can control the presence or absence of the magnetism of the electromagnet, and the reciprocating motion of the slider 303 can also be controlled by electrical control.

[0061] In some embodiments, a limit plate is provided between the pressure chamber and the sliding chamber, the limit plate is fixedly connected to the limit box 307, and a first through hole is provided in the middle of the limit plate, and the first through hole is used to connect the pressure chamber and the sliding chamber. The aperture of the first through hole is slightly smaller than the inner diameter of the limit box 307, so as to ensure that the pressure of the pressure chamber and the sliding chamber are equal.

[0062] In some embodiments, the two ends of the limit box 307 have second through holes, and the second through holes are connected to the sliding chamber. The second through holes allow the gas in the sliding chamber to be discharged when the slider 303 moves away from the magnet 302.

[0063] In some embodiments, the top of the exhaust head 101 and the bottom of the part of the structure of the limit box 307 with a sliding chamber are both provided with a slide groove 308. The two ends of the connecting rod 306 are respectively fixedly connected to the bottom of the slider 303 and the top of the exhaust valve core 304. The slide groove 308 is used to make way for the connecting rod 306 during movement. The pressure relief structure includes the slide groove 308 on the limit box 307, and the slide groove 308 is opened at the bottom of the sliding chamber. The slide groove 308 can prevent the connecting rod 306 from getting stuck during movement. It should be noted that, referring to Figure 7 When the slider 303 is located at the left limit position of the sliding chamber, the slider 303 structure can completely block the slide groove 308. As the air pressure in the sliding chamber increases, when the slider 303 moves to the right limit position of the sliding chamber, the slide groove 308 is connected with the inside of the sliding chamber, so that the sliding chamber is depressurized. Under the action of magnetic force, the slider 303 can move to the left limit position of the sliding chamber again.

[0064] In some embodiments, reference Figure 6 The baffle 3044 is fixedly connected to the exhaust valve core 304 through a connecting column, and a retaining ring is fixedly provided at the joint of the tank body 100 and the exhaust head 101. The diameter of the connecting column is smaller than the inner diameter of the retaining ring, and the diameter of the baffle 3044 is larger than the inner diameter of the retaining ring. When the baffle 3044 is fitted with the retaining ring, the tank body 100 is in a closed state. When the baffle 3044 is separated from the retaining ring, the internal gas of the tank body 100 can be discharged.

[0065] In some embodiments, the exhaust head 101 is located at the center of the end of the tank body 100, which is conducive to the effective exhaust of the air inside the tank body 100.

[0066] The working process of the sampling device for ortho-parahydrogen concentration analysis in the above embodiment is as follows: the inflation valve 200 is connected to the inflation pipe, the switch 301 is turned on, the electromagnet obtains magnetism, and under the action of the magnetic force, the magnet 302 can attract the slider 303 to move to the end of the sliding chamber close to the magnet 302. In this process, the slider 303 drives the exhaust valve core 304 to move to the first position.

[0067] The high-pressure gas inside the tank body 100 is divided into two paths. One path of gas is discharged to the outside of the tank body 100 through the exhaust flow channel 3041, and the other path of gas enters the pressure chamber through the branch flow channel 3042 and the branch pipe 305, so that the air pressure in the pressure chamber increases. Since the pressure chamber and the sliding chamber are connected, as the air pressure in the pressure chamber gradually increases to a level greater than the magnetic force exerted on the slider 303, the high-pressure gas pushes the slider 303 to slide to the end of the sliding chamber away from the magnet 302. In this process, the slider 303 drives the exhaust valve core 304 to move to the second position through the connecting rod 306.

[0068] At this time, the tank body 100 stops exhausting, and the pressure in the pressure chamber will leak out through the slide groove 308 between the slider 303 and the limit box 307, so that the pressure gradually decreases. When the pressure in the pressure chamber is less than the magnetic force exerted on the slider 303, the slider 303 moves to the end of the sliding chamber close to the magnet 302. This cycle is repeated to achieve the effect of intermittent exhaust. When the tank body 100 is filled with hydrogen, the switch 301 can be closed to maintain the sealing of the tank body 100.

[0069] Another aspect of the present invention provides a sampling method for analyzing the concentration of normal parahydrogen, which is applied to a sampling device for analyzing the concentration of normal parahydrogen, referring to Figure 8 , the method comprises the following steps:

[0070] S1. Fill hydrogen into the tank body 100 through the filling valve 200.

[0071] S2. When the pressure in the tank body 100 increases, the exhaust control component 300 drives the exhaust valve core 304 to switch between the first position and the second position, and the two ends of the tank body 100 intermittently discharge the original air in the tank body 100 and the impurities on the inner wall of the tank body 100.

[0072] S3. After the original air in the tank body 100 is exhausted, the inflation valve 200 is closed, and the exhaust control component 300 or the manually controlled exhaust valve core 304 is locked in the second position.

[0073] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A sampling device for analyzing the concentration of ortho-parahydrogen, characterized in that: It comprises a tank body (100), an air charging valve (200) and an intermittent exhaust assembly; The inflation valve (200) is connected to one end of the tank body (100), and the intermittent exhaust component is arranged on the tank body (100), and the intermittent exhaust component can allow the gas in the tank body (100) to be intermittently discharged from both ends of the tank body (100); The intermittent exhaust assembly comprises an exhaust head (101) arranged at both ends of the tank body (100), an exhaust valve core (304) and an exhaust control component (300); Wherein, the exhaust head (101) is connected to the interior of the tank body (100); The exhaust valve core (304) is slidably disposed inside the exhaust head (101), and the exhaust valve core (304) is configured to enable the tank body (100) and the exhaust head (101) to communicate with each other when in a first position, and to enable the tank body (100) and the exhaust head (101) to close each other when in a second position; The exhaust control component (300) is arranged on the tank body (100) and is connected to the exhaust valve core (304); the exhaust control component (300) can drive the exhaust valve core (304) to switch between the first position and the second position.

2. The sampling device for ortho-parahydrogen concentration analysis according to claim 1, characterized in that: The exhaust valve core (304) has an exhaust flow channel (3041), a branch flow channel (3042) and an intake flow channel (3043) inside; One end of the exhaust flow channel (3041) is connected to an end of the exhaust valve core (304) away from the tank body (100), the other end of the exhaust flow channel (3041) is arranged inside the exhaust valve core (304), and the outlet end of the exhaust flow channel (3041) is a contraction structure; One end of the branch flow channel (3042) is in communication with the middle of the exhaust flow channel (3041), and the other end of the branch flow channel (3042) is in communication with the side wall of the exhaust valve core (304); when the exhaust valve core (304) is in the first position, the other end of the branch flow channel (3042) can be in communication with the exhaust control component (300); One end of the intake channel (3043) is in communication with the middle of the exhaust channel (3041), and the other end of the intake channel (3043) is in communication with an end of the exhaust valve core (304) close to the tank body (100); One end of the exhaust valve core (304) close to the tank body (100) is fixedly connected with a baffle (3044), and the baffle (3044) is used to open or close the joint between the tank body (100) and the exhaust head (101).

3. The sampling device for analyzing the concentration of ortho-parahydrogen according to claim 2, characterized in that: The exhaust control component (300) comprises a limit box (307), a magnet (302) and two sliders (303); Wherein, the limiting box (307) is arranged on the top of the tank body (100), and the extending direction of the limiting box (307) is the same as the extending direction of the tank body (100); The magnet (302) is fixedly arranged inside the limit box (307); A pressure chamber and a sliding chamber are provided at both ends of the limit box (307), the pressure chamber and the sliding chamber are connected, the pressure chamber is located between the magnet (302) and the sliding chamber, the pressure chamber is connected to the side wall of the exhaust valve core (304) through a branch pipe (305), when the exhaust valve core (304) is in the first position, the pressure chamber can be connected to the branch flow channel (3042), and the limit box (307) has a pressure relief structure; The two sliders (303) are respectively slidably arranged in the two sliding chambers. The sliders (303) are magnetic. The end of the slider (303) close to the magnet (302) has a polarity opposite to that of the magnet (302). The slider (303) is fixedly connected to the exhaust valve core (304) via a connecting rod (306).

4. The sampling device for analyzing the concentration of ortho-parahydrogen according to claim 3, characterized in that: The magnet (302) is an electromagnet, and a switch (301) is provided on the limit box (307), and the switch (301) can control the electromagnet to be energized.

5. The sampling device for ortho-parahydrogen concentration analysis according to claim 3, characterized in that: A limiting plate is arranged between the pressure chamber and the sliding chamber, the limiting plate is fixedly connected to the limiting box (307), and a first through hole is provided in the middle of the limiting plate, and the first through hole is used to connect the pressure chamber and the sliding chamber.

6. The sampling device for ortho-parahydrogen concentration analysis according to claim 3, characterized in that: The limiting box (307) has second through holes at both ends, and the second through holes are communicated with the sliding chamber.

7. The sampling device for analyzing the concentration of ortho-parahydrogen according to claim 3, characterized in that: The top of the exhaust head (101) and the bottom of the limit box (307) having a partial structure of the sliding chamber are both provided with a slide groove (308), and the two ends of the connecting rod (306) are respectively fixedly connected to the bottom of the slider (303) and the top of the exhaust valve core (304), and the slide groove (308) is used for the connecting rod (306) to give way during the movement; The pressure relief structure includes the slide groove (308) on the limit box (307).

8. The sampling device for ortho-parahydrogen concentration analysis according to claim 2, characterized in that: The baffle plate (3044) is fixedly connected to the exhaust valve core (304) via a connecting column, a retaining ring is fixedly provided at the joint between the tank body (100) and the exhaust head (101), the diameter of the connecting column is smaller than the inner diameter of the retaining ring, and the diameter of the baffle plate (3044) is larger than the inner diameter of the retaining ring.

9. The sampling device for ortho-parahydrogen concentration analysis according to claim 8, characterized in that: The exhaust head (101) is located at the center of the end of the tank body (100).

10. A sampling method for analyzing the concentration of ortho-parahydrogen, the method being applied to the sampling device for analyzing the concentration of ortho-parahydrogen according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: Filling hydrogen into the tank body (100) through the filling valve (200); When the pressure in the tank body (100) increases, the exhaust control component (300) drives the exhaust valve core (304) to switch between the first position and the second position, and the two ends of the tank body (100) intermittently exhaust the original air in the tank body (100) and impurities on the inner wall of the tank body (100); After the tank body (100) exhausts all the original air, the inflation valve (200) is closed, and the exhaust control component (300) or the exhaust valve core (304) is locked in the second position by manual control.

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