Connecting joint assembly, infusion assembly and sampling system

Abstract

The invention relates to a connector assembly. The connector assembly comprises a connecting shell and an air pressure balance assembly. The connecting shell is provided with a first inserting hole, a first air cavity, a second inserting hole and a second air cavity. The first insertion hole is used for sealing and inserting an infusion tube, the second insertion hole is used for inserting the infusion tube, and at least part of the second insertion hole and the infusion tube are arranged at intervals to form a gap, so that the second air cavity is communicated and matched with the first container through the gap. The air pressure balance assembly is in sealing fit with the inner side wall of the connecting shell so that the interior of the connecting shell can be divided into a first air cavity and a second air cavity, and the air pressure balance assembly is used for sliding in the connecting shell under the differential pressure of the first air cavity and the second air cavity so that the first air cavity and the second air cavity can keep air pressure balance. The sample can be prevented from volatilizing easily, external pollution is avoided, meanwhile, normal downstream airflow can be guaranteed by adjusting air pressure, and liquid backflow is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of experimental sampling, and in particular to a connecting joint assembly, an infusion component and a sampling system. Background Art

[0002] Generally, in the fields of electronic chemical engineering, chemical biology, etc., sampling processes are often involved. The sampling process is generally to connect the first container and the second container through a connecting hose, so that the sample liquid in the sample bottle is transported to the sampling bottle or the reaction bottle through the connecting hose, and then the sample performance is measured by analyzing the sample in the sampling bottle, or a reaction is carried out in the reaction bottle.

[0003] In the related art, for the convenience of operation, most laboratories directly adopt the open sampling method. Specifically, the existing sampling method is that the operator wears a gas mask and acid-resistant gloves, holds an open sampling bottle to receive the chemical material in the hose, such as high-purity hydrochloric acid, hydrofluoric acid, ammonia water, etc., to achieve direct infusion sampling. It is impossible to avoid its volatilization in the air and there is a risk of leakage. The sampling bottle chooses an open beaker, and is directly connected to the cup wall of the open beaker through the connecting hose.

[0004] However, this sampling method has the following defects: On the one hand, the open sampling method is easy to introduce foreign matter such as dust, etc., which can contaminate the sample. Especially for some fields such as the semiconductor field, the detection accuracy of metal ions in the semiconductor field is ppt (parts per trillion), so tiny dust particles will cause significant metal growth in sample contamination, seriously affecting the sample quality and detection accuracy.

[0005] On the other hand, the open sampling method easily causes volatile samples to evaporate directly into the air, resulting in a decrease in the quality of the sample. For some hazardous materials, such as high-purity hydrochloric acid, hydrofluoric acid, ammonia, etc., once they evaporate or leak through the open bottle, they will cause serious harm to personnel safety and production line environment. Summary of the invention

[0006] Based on this, it is necessary to provide a connection joint assembly, an infusion component and a sampling system to prevent the sample from volatilizing and avoiding external contamination.

[0007] A connection joint assembly is used for sealing and mounting with a first container, and the connection joint assembly comprises:

[0008] A connecting shell, wherein the connecting shell is provided with a first plug hole, a first air cavity, a second plug hole and a second air cavity, wherein the first plug hole and the second plug hole respectively penetrate the opposite ends of the connecting shell along the axial direction of the connecting shell; the connecting shell is provided with one end of the second plug hole for sealing connection with the first container, the first air cavity is provided close to the first plug hole, and the second air cavity is provided close to the second plug hole; wherein the first plug hole is used for sealingly inserting an infusion tube, the second plug hole is used for inserting the infusion tube, and at least part of the second plug hole is spaced apart from the infusion tube to form a gap, so that the second air cavity is communicated and matched with the first container through the gap;

[0009] An air pressure balance component is sealed with the inner wall of the connecting shell to separate the first air cavity and the second air cavity in the connecting shell. The air pressure balance component is used to slide in the connecting shell under the pressure difference between the first air cavity and the second air cavity so that the first air cavity and the second air cavity maintain air pressure balance.

[0010] In one embodiment, the air pressure balance assembly includes a piston member, and the piston member is provided with a third plug hole; wherein the piston member is in sealing and sliding cooperation with the inner side wall of the connecting housing;

[0011] Alternatively, the air pressure balance assembly further comprises a sealing member connected to the piston member, the piston member slidably cooperates with the inner side wall of the connecting shell; the piston member is sealingly cooperated with the inner side wall of the connecting shell through the sealing member.

[0012] In one embodiment, the sealing member comprises a sealing sleeve; the sealing sleeve is sleeved on the outer side wall of the piston member, so that the piston member slides and seals with the inner side wall of the connecting shell through the sealing sleeve.

[0013] In one embodiment, the sealing member comprises an elastic sealing member; the piston member is sealed and matched with the inner side wall of the connecting shell through the elastic sealing member; the elastic sealing member is arranged in the second air cavity; the elastic sealing member is slidably inserted and matched with the infusion tube; the elastic sealing member is connected and matched with the piston member, so that the elastic sealing member and the piston member slide synchronously along the inner side wall of the connecting shell; the elastic sealing member is provided with a matching opening at one end away from the piston member, and the elastic sealing member is convectively matched with the first container through the matching opening;

[0014] When the airflow pressure of the elastic seal subjected to the first-direction airflow is greater than or equal to the critical airflow pressure, the side wall of the elastic seal can be moved toward the inner wall close to the connecting shell under the airflow pressure, so that the side wall of the elastic seal is sealed and connected with the inner wall of the connecting shell, so that the first air cavity and the second air cavity are sealed and matched; conversely, at least part of the side wall of the elastic seal is spaced apart from the inner wall of the connecting shell, so that the first air cavity and the second air cavity are connected; wherein, the airflow in the first direction is the airflow flowing in the direction from the second air cavity toward the first air cavity.

[0015] In one embodiment, the elastic sealing member is provided with a soft body portion, a second end and a soft body cone portion connected between the soft body portion and the second end; the soft body portion and the second end are arranged relatively spaced apart along the axial direction; the soft body portion is connected to the piston member, and the second end is provided with the matching opening; the matching opening is arranged in communication with the soft body cone portion; along the direction from the second end to the soft body portion, the soft body cone portion is gradually gathered along the axial direction; wherein,

[0016] When the airflow pressure of the airflow in the first direction applied to the elastic sealing component is greater than or equal to the critical airflow pressure, the soft cone portion bears the airflow pressure of the airflow in the first direction through the matching opening, driving the side edge of the soft cone portion to flip in the direction close to the inner side wall of the connecting shell, so that the second end is sealed and connected to the inner side wall of the connecting shell; otherwise, the second end is spaced apart from the inner side wall of the connecting shell.

[0017] In one embodiment, the elastic seal is provided with a third air cavity; the third air cavity is connected with the first container through the matching opening; when the second air cavity has the first-direction airflow, the first-direction airflow enters the third air cavity through the matching opening, and the airflow volume in the third air cavity increases from the first capacity to the second capacity at least, so that the elastic seal is squeezed in the direction close to the inner side wall of the connecting shell, so that the elastic seal is in abutment and sealing cooperation with the inner side wall of the connecting shell.

[0018] In one embodiment, the connecting shell is also provided with an air inlet and a switch element for sealingly cooperating with the air inlet; the air inlet is connected to the first air cavity; the switch element is used to open the air inlet so that the first air cavity is connected to the outside through the air inlet.

[0019] In one embodiment, the connecting joint assembly also includes a connecting piece, which is arranged at the bottle mouth of the first container; wherein, one of the connecting shell and the connecting piece is provided with an internal thread structure, and the other is provided with an external thread structure; through the screw connection between the internal thread structure and the external thread structure, the connecting shell is screwed and fixed to the bottle mouth of the first container.

[0020] An infusion assembly comprises an infusion tube and the connecting joint assembly in the above-mentioned embodiment; the infusion tube is sealed and inserted into a first plug hole; the infusion tube is inserted into a second plug hole, and at least part of the infusion tube is spaced apart from the second plug hole to form a gap, so that the second air cavity is connected to the first container through the gap; the infusion tube is arranged in the first air cavity and the second air cavity, and is connected to the first container.

[0021] A sampling system for sampling from a second container comprises a first container and a connecting joint assembly in the above-mentioned embodiment, wherein the connecting joint assembly is arranged between the first container and the second container so that the first container can sample from the second container through the connecting joint assembly.

[0022] The above-mentioned connecting joint assembly and sampling system realize that the infusion tube is sealed and penetrates into the connecting shell, and one end of the connecting shell is sealed and connected to the first container, so that foreign matter such as dust from the outside cannot enter into the infusion tube, the connecting shell and the first container, forming a good sealing protection effect for the sample solution taken out, avoiding contamination by foreign matter from the outside.

[0023] Furthermore, by setting up the air pressure balance component, the first air cavity and the second air cavity are sealed and connected, and when there is a pressure difference between the first air cavity and the second air cavity (the first container), the movement of the air pressure balance component drives the volume of the first air cavity and the volume of the second air cavity to be relatively adjustable (wherein, while the volume of the first air cavity decreases, the volume of the second air cavity increases; while the volume of the first air cavity increases, the volume of the second air cavity decreases), thereby realizing the pressure change adjustment of the first air cavity and the second air cavity, and then the first air cavity maintains air pressure balance with the second air cavity through the air pressure balance component, thereby ensuring that the pressure of the first container will not be too high and ensuring that the injection liquid can flow into the first container normally.

[0024] In addition, the third plug hole in the air pressure balance component is in sealing cooperation with the infusion tube. On the one hand, the sealing cooperation between the third plug hole and the infusion tube can be used to ensure that the first air cavity and the second air cavity are not connected through the third plug hole. On the other hand, the third plug hole can be used to seal and fasten the infusion tube, such as interference fit, to fix the infusion tube in the third plug hole, avoid shaking of the infusion tube in the radial direction, and improve the installation stability of the infusion tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the structure of a sampling system in one embodiment.

[0026] Figure 2 Schematic diagram of the structure of a connecting joint assembly in one embodiment.

[0027] Figure 3 Schematic diagram of the structure of a flexible sealing member not subjected to airflow in the first direction in one embodiment.

[0028] Figure 4 for Figure 3 The flexible seal shown in the figure is a schematic structural diagram of a state in which it is subjected to airflow in a first direction.

[0029] Figure 5 FIG. 4 is a schematic diagram of the structure of a flexible sealing member in another embodiment.

[0030] Figure 6 It is a schematic diagram of the matching structure of the connecting shell and the connecting member in one embodiment.

[0031] Figure 7 Schematic diagram of the structure of an infusion tube in one embodiment.

[0032] Description of Figure Numbers:

[0033] 1. Sampling system; 10. Infusion component; 100. Connecting joint assembly; 110. Connecting shell; 110a. Internal thread structure; 111. First plug hole; 112. First air cavity; 113. Second plug hole; 114. Second air cavity; 115. Air inlet; 116. Switch member; 120. Air pressure balance component; 121. Piston member; 122. Sealing member; 1221. Elastic sealing member; 1221a. First end; 1221b. Soft cone; 1221c. Second end; 1221d. Third air cavity; 130. Connecting member; 131. External thread structure; 200. Infusion tube; 210. Straight tube portion; 211. First straight tube; 212. Second straight tube; 222. Anti-reversal portion; 20. First container; 30. Second container; X. Axial direction. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0035] See also Figure 1 , Figure 1 The schematic diagram of the structure of the sampling system 1 in one embodiment of the present application is shown. The sampling system 1 provided in one embodiment of the present application includes an infusion component 10 and a first container 20 (which may be a sampling container). The infusion component is connected and arranged between the first container 20 (which may be a sampling container) and the second container 30 (which may be a sample container).

[0036] like Figure 2 As shown, the infusion assembly includes an infusion tube 200 and a connection joint assembly 100. Specifically, the connection joint assembly 100 includes a connection housing 110, an infusion tube 200 and an air pressure balance assembly 120.

[0037] The connection housing 110 is provided with a first plug hole 111, a first air cavity 112, a second plug hole 113 and a second air cavity 114. The first plug hole 111 and the second plug hole 113 are respectively provided at opposite ends of the connection housing 110 along the axial direction X. The first air cavity 112 is provided close to the first plug hole 111, and the second air cavity is provided close to the second plug hole 113. One end of the connection housing 110 provided with the second plug hole 113 is sealed and connected to the first container 20, and the second air cavity 114 is in communication with the first container 20.

[0038] The infusion tube 200 is sealed and plugged into the first plug hole 111, and the infusion tube 200 is inserted into the second plug hole 113, and at least part of the second plug hole 113 is spaced apart from the infusion tube 200 to form a gap, so that the second air cavity 114 is connected and matched with the first container 20 through the gap. The infusion tube 200 is set in the first air cavity 112 and the second air cavity 114, and is connected with the first container 20. It should be noted that the gap can be, but is not limited to, an irregular pattern gap formed by partially spacing the inner side wall of the second plug hole 113 and the infusion tube 200, and can also be an annular gap formed by completely spacing the inner side wall of the second plug hole 113 and the infusion tube 200.

[0039] like Figure 3 As shown, the air pressure balance assembly 120 is sealed with the inner side wall of the connection housing 110 to separate the first air cavity 112 and the second air cavity 114 in the connection housing 110. The air pressure balance assembly 120 is used to slide in the connection housing 110 under the pressure difference between the first air cavity 112 and the second air cavity 114, so that the first air cavity 112 and the second air cavity 114 maintain air pressure balance.

[0040] For ease of understanding, the cooperation principle between the air pressure balance assembly 120 and the connection shell 110 in an implementation scenario is described in detail below.

[0041] Assume that the pressure of the second air chamber 114 on the piston member 121 is F2, the air pressure of the second air chamber 114 is P2, the volume of the second air chamber 114 is the sum of the volume of the gas on the liquid surface in the accommodating chamber of the first container 20 V2, and F2=P2*V2; the self-gravity of the air pressure balance component 120 is Gm; the friction force between the air pressure balance component 120 and the inner wall of the connecting shell 110 is f; the pressure generated by the air pressure of the first air chamber 112 is F1, the air pressure of the first air chamber 112 is P1, the volume of the second air chamber 114 is V1, and F1=P1*V1.

[0042] When the sample liquid is a volatile sample liquid (such as concentrated hydrochloric acid solution or hydrofluoric acid), the sample liquid in the first container 20 evaporates, resulting in a large amount of chemical gas (such as HCl gas, HF gas, etc.) being generated in the containing cavity of the first container 20, so that the gas in the first container 20 escapes to the second gas cavity 114, causing the gas pressure of the second gas cavity 114 to increase, and the gas pressure difference between the second gas cavity 114 and the first gas cavity 112 continues to increase.

[0043] As the sample liquid continues to evaporate, there is a moment when F2> (Gm+f+F1), then the pressure difference between the second air cavity 114 and the first air cavity 112 will cause the airflow in the second air cavity 114 to push the air pressure balance component 120 along Figure 2 The air pressure balance assembly 120 moves upward in the vertical direction shown in the figure, and the volume of the first air cavity 112 and the volume of the second air cavity 114 are relatively adjustable (V1 increases, V2 decreases; V1 decreases, V2 increases). The air pressure balance assembly 120 moves upward in the vertical direction shown in the figure. Figure 2 When moving upward in the vertical direction as shown, V2 increases and P2 decreases, thereby reducing the pressure difference between the second container 30 and the first container 20, avoiding excessive gas in the first container 20, which makes it difficult for the sample liquid to continue to flow out or even backflow.

[0044] In this way, the infusion tube 200 is sealed and penetrates into the connecting shell 110, and one end of the connecting shell 110 is sealed and connected to the first container 20, so that foreign matter such as dust from the outside cannot enter into the infusion tube 200, the connecting shell 110 and the first container 20, thereby forming a good sealing protection for the sample solution taken out and avoiding contamination by foreign matter from the outside.

[0045] Furthermore, by setting the air pressure balance component 120, the first air cavity 112 and the second air cavity 114 are sealed and connected, and when there is a pressure difference between the first air cavity 112 and the second air cavity 114 (the accommodating cavity of the first container 20), the pressure change adjustment of the first air cavity 112 and the second air cavity 114 is realized, and then the first air cavity 112 maintains air pressure balance with the second air cavity 114 through the air pressure balance component 120, so that the air pressure of the first container 20 is adjustable, which can reduce the pressure difference between the first container 20 and the second container 30, and ensure that the injection liquid can flow into the first container 20 normally, thereby ensuring the injection efficiency.

[0046] In addition, the third socket in the air pressure balance component 120 is sealed with the infusion tube 200, which can be but is not limited to a sealing rubber ring such as a rubber ring, an adhesive ring, etc. provided on the side wall of the third socket, wherein the infusion tube 200 is sealed with the third socket through the sealing rubber ring.

[0047] In this way, on the one hand, the sealing cooperation between the third jack and the infusion tube 200 can be utilized to ensure that the first air cavity 112 and the second air cavity 114 are not connected through the third jack; on the other hand, the limiting cooperation or interference cooperation when the third jack and the infusion tube 200 are sealed can be utilized to achieve the limiting fastening of the infusion tube 200, so as to realize the fixation of the infusion tube 200 in the third jack, avoid the shaking of the infusion tube 200 in the radial direction, and can realize the close friction fixation of the infusion tube 200 through the sealing member 122 such as the sealing rubber ring, so as to avoid the infusion tube 200 from slipping into the first container 20 and causing contamination of the infusion tube 200.

[0048] It should be noted that, depending on the usage scenario, there may be various types of the first container 20 and the second container 30. For example, the infusion assembly may be used in a reaction system, the first container 20 may be a reaction container (such as a reaction bottle, etc.), and the second container 30 may be a raw material container (for transporting a reactant solution).

[0049] In one embodiment, Figure 2 The air pressure balance assembly 120 includes a piston member 121 having a third plug hole. It should be noted that the piston member 121 can be directly sealed and connected to the inner wall of the connection housing 110, or can be realized through other sealing members 122.

[0050] In a specific embodiment, the piston 121 is sealingly slidably matched with the inner wall of the connection housing 110. The piston 121 can be, but is not limited to, a rubber plug, and can also be other flexible sealing materials such as a silicone plug.

[0051] In another specific embodiment, the air pressure balance assembly 120 further includes a sealing member 122 connected to the piston member 121, and the piston member 121 is slidably matched with the inner side wall of the connection housing 110. The sealing member 122 is used to seal with the inner side wall of the connection housing 110. The first air cavity 112 and the second air cavity 114 are sealed by the sealing member 122.

[0052] In one example, the sealing member 122 includes a sealing sleeve. The sealing sleeve is sleeved on the outside of the piston member 121, so that the piston member 121 slides and seals with the inner wall of the connection housing 110 through the sealing sleeve. It should be noted that the sealing sleeve can be but is not limited to a rubber sleeve, a silicone sleeve, a waterproof plastic film, etc., and there are no excessive restrictions here. In this way, the sealing is achieved by sleeved on the outside of the piston member 121, the structure is simple, and it is convenient to process and set.

[0053] In another specific embodiment, the seal 122 includes an elastic seal 1221. Figure 2 , the elastic seal 1221 is arranged in the second air cavity 114. The elastic seal 1221 can be provided with a fourth plug hole, and the fourth plug hole is slidably inserted and matched with the infusion tube 200, so that the elastic seal 1221 can slide up and down relative to the infusion tube 200 along the axial direction X. The elastic seal 1221 is connected and matched with the piston member 121, so that the elastic seal 1221 and the piston member 121 slide synchronously along the inner wall of the connection shell 110. The elastic seal 1221 is provided with a matching opening at one end away from the piston member 121, and the elastic seal 1221 is convectively matched with the first container 20 through the matching opening. For ease of understanding, the working principle of the elastic seal 1221 is described in detail below.

[0054] If the sample liquid is a volatile material, the volatile material will escape from the first container 20 to the second air cavity 114, so that a first direction airflow (i.e., volatile material) is generated in the second air cavity 114. The first direction airflow is arranged in convection with the matching opening, so that the elastic sealing member 1221 can be subjected to the airflow pressure of the first direction airflow and thus elastically deform. The first direction airflow is the airflow flowing in the direction from the second air cavity 114 to the first air cavity 112.

[0055] When the volatile materials in the first container 20 and the second air cavity 114 escape faster, a first direction airflow with a greater pressure will be generated. When the airflow pressure of the first direction airflow on the elastic seal 1221 is greater than or equal to the critical airflow pressure (wherein the critical airflow pressure depends on the elastic limit of the elastic seal 1221 and the force angle of the first direction airflow on the elastic seal 1221), the side wall of the elastic seal 1221 can be moved toward the inner side wall close to the connection shell 110 under the airflow pressure, so that the side wall of the elastic seal 1221 is sealed and connected with the inner side wall of the connection shell 110, so that the first air cavity 112 and the second air cavity 114 are sealed and matched, thereby preventing the volatile materials from escaping to the first air cavity 112, reducing the escape range of the volatile materials, and facilitating the injection concentration of the injection liquid.

[0056] Furthermore, the first air cavity 112 and the second air cavity 114 can be sealed by the sealing connection between the elastic sealing member 1221 and the inner side wall of the connecting shell 110. As the amount of volatile material escape increases, the pressure of the second air cavity 114 increases, and then the pressure difference between the first air cavity 112 and the second air cavity 114 increases. At this time, the pressure difference between the first air cavity 112 and the second air cavity 114 can be used to push the piston member 121 to move in the axial direction X to adjust the air pressure between the first air cavity 112 and the second air cavity 114 (wherein V1 decreases, P1 increases, V2 increases, and P2 decreases), and then the air pressure of the second air cavity 114 and the first container 20 is reduced, and the pressure difference between the first container 20 and the second container 30 is reduced, so as to ensure that the liquid in the infusion tube 200 can slide smoothly into the first container 20, and ensure the injection process.

[0057] On the contrary, if the injection liquid is a chemical material that is not easy to volatilize, since less gas escapes from the first container 20, the elastic seal 1221 is not subjected to the airflow pressure of the first direction airflow, or the airflow pressure of the first direction airflow exerted on the elastic seal 1221 is less than the critical airflow pressure. Based on the pressure that does not reach the corresponding deformation amount of the elastic seal 1221, the elastic seal 1221 cannot move toward the inner wall of the connecting shell 110, so that the first air cavity 112 can be connected with the second air cavity 114 and the first container 20, thereby realizing the sealed injection of the connecting shell and the first container 20.

[0058] At least a portion of the side wall of the elastic sealing member 1221 is spaced apart from the inner side wall of the connecting housing 110 , so that the first air cavity 112 and the second air cavity 114 are connected.

[0059] In this way, since the elastic seal 1221 and the first-direction airflow can be used to switch between providing sealing and connection between the first air cavity 112 and the second air cavity 114, the sealing contact pressure of the piston member 121 on the inner wall of the connecting shell 110 can be reduced, so that the sliding friction resistance between the piston member 121 and the inner wall of the connecting shell 110 can be reduced, which facilitates the rapid movement of the piston member 121 to adjust the air pressure or facilitates rapid disassembly.

[0060] In addition, the elastic seal 1221 can also serve as a trigger for air pressure balance. When encountering volatile chemicals, it can cooperate with the first direction airflow to achieve the sealing of the first air cavity 112 and the second air cavity 114, and further adjust the air pressure of the second air cavity 114 through the piston 121, which can prevent the airflow from flowing back and ensure that the air pressure of the first container 20 is not too high, thereby ensuring the smooth injection of the sample liquid.

[0061] In a specific embodiment, the elastic seal 1221 is provided with a soft body part, a second end 1221c and a soft body cone 1221b connected between the soft body part and the second end 1221c. The soft body part and the second end 1221c are arranged relatively spaced along the axial direction X. The soft body part is connected to the piston member 121, and the second end 1221c is provided with a matching opening. The matching opening is arranged in communication with the soft body cone 1221b, that is, the airflow in the first direction blows through the matching opening and matches with the soft body cone 1221b, so that the soft body cone 1221b is forced to unfold. In the direction from the second end 1221c to the soft body part, the soft body cone 1221b is gradually retracted and arranged close to the axial direction X. Among them, the soft body cone 1221b can be a pyramidal surface, a circular conical surface, a curved conical surface, etc., and no excessive restrictions are made here. The elastic seal 1221 can be designed in a structure of a soft suction cup, a soft umbrella, etc.

[0062] When the airflow pressure of the elastic sealing member 1221 in the first direction is greater than or equal to the critical airflow pressure, the soft cone 1221b bears the airflow pressure of the first direction through the matching opening, and the soft cone 1221b of the elastic sealing member 1221 is inclined so that the soft cone 1221b is Figure 3 The oblique upward airflow pressure in the direction shown causes the side edge of the soft cone 1221b to flip in a direction close to the inner wall of the connecting shell 110, so that the second end 1221c is sealed and connected to the inner wall of the connecting shell 110.

[0063] The elastic sealing member 1221 is not subjected to the airflow pressure of the first direction airflow, or the airflow pressure of the first direction airflow subjected to the elastic sealing member 1221 is less than the critical airflow pressure, and the second end 1221c is spaced apart from the inner side wall of the connection shell 110 .

[0064] It should be noted that the material of the soft cone portion 1221b of the elastic seal 1221 can be but is not limited to soft rubber, and can also be an airtight film layer such as a polyethylene film layer, etc., and no excessive restrictions are made here.

[0065] In one example, the elastic seal 1221 can be a soft rubber suction cup, and the soft cone 1221b is arranged on the side wall of the soft rubber suction cup. In this way, the structural design of the suction cup can save the setting space in the axial direction X, which is conducive to the portrait of the connecting shell 110, and at the same time can reduce the flipping distance between the second end 1221c and the inner wall of the connecting shell 110, and can quickly achieve the sealing cooperation between the first air cavity 112 and the second air cavity 114. In addition, the choice of rubber material is different from the soft cone 1221b made of a plastic film layer, etc. The support strength of the rubber soft cone 1221b is stronger, which is conducive to ensuring the stability of the sealing connection between the second end 1221c and the inner wall of the connecting shell 110, thereby facilitating the rapid arrival of the critical air flow pressure, and then quickly adjusting the air pressure of the second air cavity 114 to ensure the liquid injection efficiency of the injection.

[0066] In another example, Figure 5 As shown, the elastic sealing member 1221 is provided with a third air cavity 1221d. The third air cavity 1221d is communicated with the first container 20 through a matching opening.

[0067] Specifically, in one implementation scenario, when the second air cavity 114 has a first-direction airflow (at this time, the air pressure of the first container 20 is relatively high), the first-direction airflow enters the third air cavity 1221d through the matching opening. As time goes by, the volume in the third air cavity 1221d increases from the first capacity to the second capacity at least (similar to the principle of a balloon), so that the elastic seal 1221 rises and opens in the radial direction, so that the elastic seal 1221 abuts and seals against the inner side wall of the connection housing 110. In this way, the elastic seal 1221 can receive the airflow to reduce the air pressure of the first container 20, and the elastic seal 1221 can seal the first air cavity 112 and the second air cavity 114 to prevent gas from overflowing into the first air cavity 112, which is conducive to reducing the difficulty of gas recovery and reducing sampling volatilization losses.

[0068] Correspondingly, in another implementation scenario, when the second air cavity 114 is not subjected to the airflow in the first direction or the third air does not reach the second capacity, since there is less gas in the elastic seal 1221, the elastic seal 1221 shrinks and returns to its original shape. At this time, the elastic seal 1221 is at least partially spaced from the inner wall of the connecting shell 110, and has no effect on the downstream flow of the gas, thus facilitating the disassembly of the connecting shell 110 and the air pressure balance assembly 120.

[0069] In combination with any of the above-mentioned embodiments of the connection housing 110, Figure 2The connecting housing 110 is further provided with an air inlet 115 and a switch 116 for sealingly cooperating with the air inlet 115. The air inlet 115 is in communication with the first air cavity 112. The switch 116 is used to open the air inlet 115 so that the first air cavity 112 is in communication with the outside through the air inlet 115. The outside may be, but is not limited to, air in the outside environment, and may also be other gases such as an inert gas to be supplied to the first air cavity 112.

[0070] It is understandable that when the air pressure in the first container 20 is too high, the gas in the first air cavity 112 has been compressed to a level that can be balanced with the gas in the second air cavity 114, but the air pressure in the first container 20 is still much higher than the air pressure in the sample chamber of the second container 30, and the sample liquid still has difficulty flowing downward. At this time, the air inlet 115 can be opened to connect the air inlet 115 with the first air cavity 112, so that the air pressure in the first air cavity 112 is reduced to the same level as the air pressure of the external gas (such as reducing the air pressure in the first air cavity 112 to the atmospheric pressure), and then the air pressure in the second air cavity 114 can continue to push the piston 121 along the Figure 2 The vertical upward movement in the vertical direction shown squeezes the first air cavity 112 (at this time V1 decreases and P1 increases), thereby further reducing P2, and then allowing the injection liquid to descend smoothly, preventing the injection liquid from flowing back into the infusion tube 200 and the second container 30.

[0071] It should be noted that the switch member 116 can be a rubber plug, a clamping valve, etc., and no further limitation is given here.

[0072] In some embodiments, such as Figure 6 As shown, the connection joint assembly 100 further includes a connection member 130, which is disposed at the mouth of the first container 20. The connection housing 110 is screwed and fixed to the mouth of the first container 20. In one example, the connection housing 110 is provided with an internal thread structure 110a, and the connection member 130 is provided with an external thread structure 131, and the internal thread structure 110a and the external thread structure 131 are screwed together. In this way, the sealing connection stability between the connection housing 110 and the first container 20 can be improved, thereby preventing foreign matter from entering the first container 20 and causing contamination.

[0073] It should be noted that the connecting member 130 can be a glass plug, a rubber plug, etc., and no further limitation is given here.

[0074] In some embodiments, the connection housing 110 may be made of a transparent material, so that the installation conditions in the connection housing 110 and the movement conditions of the piston member 121 are clearly visible.

[0075] Furthermore, the outer wall of the connecting shell 110 can also be provided with a scale bar arranged along the axial direction X, and the piston 121 moves within the range of the scale bar. In this way, the air pressure of the first container 20 can be reflected by the setting of the scale bar, and the gas dissolution in the first container 20 can be known according to the scale bar, so as to better adjust the infusion flow rate (for example, when the movement amplitude of the piston 121 is too fast, it means that the gas in the injection liquid overflows too fast. At this time, the speed regulating valve of the sampling system 1 can be used to reduce the infusion flow rate of the injection liquid to reduce the gas overflow speed). Alternatively, the movement of the piston 121 can be reflected by the scale bar, thereby reflecting the gas volatilization rate of the injection solution, so as to be used as experimental data.

[0076] In addition to preventing gas backflow in the above embodiments, the quality of sampling can also be improved by preventing the backflow of the sampled liquid. In combination with any embodiment of the above infusion tube 200, Figure 7 As shown, the infusion tube 200 includes a straight tube portion 210 and an anti-reversal portion 222 connected to the straight tube portion 210. The straight tube portion 210 includes a first straight tube 211 and a second straight tube 212. One end of the first straight tube 211 is sealed with the second container 30, and the other end is connected to one end of the anti-reversal portion 222; one end of the second straight tube 212 is used to communicate with the first container 20 of the first container 20 for infusion, and the other end is connected to the other end of the anti-reversal portion 222. At least part of the tube wall surface of the anti-reversal portion 222 is provided with a tapered surface, and at this time, the tube diameter of the first straight tube 211 is larger than the tube diameter of the second straight tube 212.

[0077] In this way, the portion of the infusion tube 200 is provided with a conical surface, so that when the sample liquid flows back, the sample liquid needs to overcome a certain climbing movement resistance, thereby reducing the risk of the sample liquid flowing back. Further, by making the diameter of the first straight tube 211 larger than the diameter of the second straight tube 212, the speed at which the sample liquid enters the first container 20 can be reduced, thereby making the injection process more stable and avoiding splashing to cause excessive sample solution to remain on the inner wall of the first container 20.

[0078] It should be noted that the anti-reversal portion 222 and the straight tube portion 210 may be integrally formed (eg, both are integrally formed of a rubber tube), or may be detachably connected to a hose via a joint.

[0079] In one embodiment, one end of the infusion tube 200 does not exceed the bottom end of the connector 130. In this way, it can be ensured that the infusion tube 200 does not enter the first container 20, thereby preventing the first container 20 from contaminating the infusion tube 200.

[0080] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply 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 on the present application.

[0081] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0082] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0083] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the 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. The first feature being "below", "below" and "below" the 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.

[0084] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0085] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0086] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A connection joint assembly, used for sealing and mounting with a first container, characterized in that: The connecting joint assembly comprises: A connecting shell, the connecting shell is provided with a first plug hole, a first air cavity, a second plug hole and a second air cavity, the first plug hole and the second plug hole are respectively arranged at opposite ends of the connecting shell along the axial direction of the connecting shell; the connecting shell is provided with one end of the second plug hole, which is used for sealing connection with the first container, the first air cavity is arranged close to the first plug hole, and the second air cavity is arranged close to the second plug hole; wherein the first plug hole is used for sealingly inserting an infusion tube, the second plug hole is used for inserting the infusion tube, and at least part of the second plug hole is arranged at intervals with the infusion tube to form a gap, so that the second air cavity is communicated with the first container through the gap; An air pressure balance component is sealed with the inner wall of the connecting shell to separate the first air cavity and the second air cavity in the connecting shell. The air pressure balance component is used to slide in the connecting shell under the pressure difference between the first air cavity and the second air cavity so that the first air cavity and the second air cavity maintain air pressure balance.

2. The connection joint assembly according to claim 1, characterized in that: The air pressure balance assembly includes a piston member, and the piston member is provided with a third plug hole; wherein, The piston member is in sealing and sliding cooperation with the inner side wall of the connecting housing; Alternatively, the air pressure balance assembly further comprises a sealing member connected to the piston member, the piston member slidably cooperates with the inner side wall of the connecting shell; the piston member is sealingly cooperated with the inner side wall of the connecting shell through the sealing member.

3. The connection joint assembly according to claim 2, characterized in that: The sealing member comprises a sealing sleeve; the sealing sleeve is sleeved on the outer side wall of the piston member, so that the piston member slides and seals with the inner side wall of the connecting shell through the sealing sleeve.

4. The connection joint assembly according to claim 2, characterized in that: The sealing member comprises an elastic sealing member; the piston member is sealed and matched with the inner side wall of the connecting shell through the elastic sealing member; the elastic sealing member is arranged in the second air cavity; the elastic sealing member is slidably inserted and matched with the infusion tube, and the elastic sealing member is connected and matched with the piston member, so that the elastic sealing member and the piston member slide synchronously along the inner side wall of the connecting shell; the elastic sealing member is provided with a matching opening at one end thereof which is away from the piston member, and the elastic sealing member is convection-matched with the first container through the matching opening; When the airflow pressure of the airflow in the first direction on the elastic seal is greater than or equal to the critical airflow pressure, the side wall of the elastic seal can be moved toward the inner side wall close to the connecting shell under the airflow pressure, so that the side wall of the elastic seal is sealed and connected with the inner side wall of the connecting shell, so that the first air cavity and the second air cavity are sealed and matched; On the contrary, at least part of the side wall of the elastic seal is spaced apart from the inner side wall of the connecting shell, so that the first air cavity and the second air cavity are connected; wherein the first direction airflow is the airflow flowing in the direction from the second air cavity toward the first air cavity.

5. The connection joint assembly according to claim 4, characterized in that: The elastic sealing member is provided with a soft body portion, a second end and a soft body cone portion connected between the soft body portion and the second end; the soft body portion and the second end are arranged relatively spaced apart along the axial direction; the soft body portion is connected to the piston member, and the second end is provided with the matching opening; the matching opening is arranged in communication with the soft body cone portion; along the direction from the second end to the soft body portion, the soft body cone portion is gradually gathered close to the axial direction; wherein, When the airflow pressure of the airflow in the first direction applied to the elastic sealing component is greater than or equal to the critical airflow pressure, the soft cone portion bears the airflow pressure of the airflow in the first direction through the matching opening, driving the side edge of the soft cone portion to flip in the direction close to the inner side wall of the connecting shell, so that the second end is sealed and connected to the inner side wall of the connecting shell; otherwise, the second end is spaced apart from the inner side wall of the connecting shell.

6. The connection joint assembly according to claim 4, characterized in that: The elastic seal is provided with a third air cavity; the third air cavity is connected with the first container through the matching opening; when the second air cavity has the first-direction airflow, the first-direction airflow enters the third air cavity through the matching opening, and the airflow volume in the third air cavity increases from the first capacity to the second capacity at least, so that the elastic seal is squeezed in the direction close to the inner side wall of the connecting shell, so that the elastic seal is in abutment and sealing cooperation with the inner side wall of the connecting shell.

7. The connection joint assembly according to claim 1, characterized in that: The connecting shell is also provided with an air inlet and a switch member for sealingly cooperating with the air inlet; the air inlet is connected with the first air cavity; the switch member is used to open the air inlet so that the first air cavity is connected with the outside through the air inlet.

8. The connection joint assembly according to any one of claims 1 to 7, characterized in that: The connecting joint assembly also includes a connecting piece, which is arranged at the bottle mouth of the first container; wherein, one of the connecting shell and the connecting piece is provided with an internal thread structure, and the other is provided with an external thread structure; through the screw connection between the internal thread structure and the external thread structure, the connecting shell is screwed and fixed to the bottle mouth of the first container.

9. An infusion assembly, characterized in that: It includes an infusion tube and a connecting joint assembly as described in any one of claims 1 to 8 above; the infusion tube is sealably inserted into a first plug hole; the infusion tube is inserted into a second plug hole, and at least a portion of the infusion tube is spaced apart from the second plug hole to form a gap, so that the second air cavity is connected to the first container through the gap; the infusion tube is arranged in the first air cavity and the second air cavity, and is connected to the first container.

10. A sampling system for taking a sample from a second container, characterized in that: It comprises a first container and the infusion assembly as claimed in claim 9, wherein the infusion assembly is connected between the first container and the second container so that the first container can take a sample from the second container through the infusion assembly.

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