A safe and pollution-free water sample storage tube cover sealing performance detection structure

Abstract

The invention discloses a tube cover sealing performance detection structure for a safe and pollution-free water sample storage tube, comprising: a fixing seat, a locking piece and a sleeve detachably connected to the fixing seat; a sample storage tube fixed to the fixing seat by the locking piece and covered by the sleeve, a tube cover locked on the tube body, a sliding nail arranged on the inner side of the outer cover, an expansion node and a bursting node arranged on the outside of the tube body in sequence from bottom to top, the bursting node being arranged at the bottle edge of the tube body, the sliding nail sliding through the expansion node and pressing to the bottom of the bursting node when the air pressure in the tube body increases; an air guide hole being arranged at the position where the inner cover fits the tube body, the air guide hole just connecting the tube body with the external space when the sliding nail contacts the bursting node, and through clear distance changes at different stages, the detection personnel can intuitively, quickly and in real time understand the specific pressure bearing data of the sample storage tube, so as to improve the accuracy of the detection data.

Description

Technical Field

[0001] The invention relates to the field of container sealing performance detection, in particular to a tube cover sealing performance detection structure for a safe and pollution-free water sample storage tube. Background Art

[0002] Water quality inspection refers to the work of testing the physical and chemical properties of groundwater and the microorganisms it contains during water supply hydrogeological surveys. It provides information for the development and utilization of groundwater and the determination of its corrosiveness to building structural materials (see water and soil corrosiveness test). In the process of water quality inspection, water samples to be tested are often preserved in water sample storage tubes and then transported to the laboratory for specific analysis and verification. However, some problems are prone to occur during transportation.

[0003] In the prior art, the tube cover and the tube body of a water sample preservation tube such as a sampling tube are usually screwed together using a threaded connection structure. Although the tube cover is screwed together with the tube body through a threaded connection structure, it can not only improve the convenience of disassembly and assembly of the tube cover and the tube body, but also ensure the sealing of the connection between the two. This type of water sample preservation tube is the most common type of water sample preservation tube on the market.

[0004] Some special customers will require that the sealing performance of the tube cover of the water sample storage tube be marked before leaving the factory (defined as the maximum pressure that the tube cover can withstand from the inside of the tube body under the premise of maintaining a good and stable sealing performance), that is, under what pressure environment inside the tube body, the tube cover screwed on the tube body can still maintain a good and stable sealing performance. When collecting water samples from some special areas (such as water samples containing expandable gas inside), although the water sample is a fixed volume at the beginning of collection, after being placed in a sealed water sample storage tube, the gas contained in the water sample will expand and release. At this time, the threaded tube cover structure can maintain a short-term sealing effect, but after the gas continues to expand, it will directly spray out the threaded tube cover, causing the water sample to leak. Because the threaded tube cover is used, its thread structure has gradually deformed before the water sample is sprayed out, and the sealing performance has long been destroyed, but it is still screwed on the tank body. At this time, the detected tube body pressure is difficult to determine as the actual deformation pressure, resulting in it being difficult to accurately test the sealing performance of the tube cover of the water sample storage tube for labeling before the water sample storage tube leaves the factory. Summary of the invention

[0005] The present invention provides a safe and pollution-free tube cover sealing performance detection structure for a water sample storage tube, which can effectively solve the above-mentioned problem.

[0006] The present invention is achieved in that:

[0007] A safe and pollution-free water sample storage tube cover sealing performance detection structure, comprising:

[0008] It includes a fixing seat, a locking piece, and a sleeve detachably connected to the fixing seat;

[0009] A sample storage tube fixed on the fixing seat by a locking member and covered by a sleeve, wherein the sample storage tube has an opening, and the fixing seat has a pressurizing channel that is sealed and docked with the opening on the tube body to allow high-pressure medium to enter the tube body;

[0010] A tube cover locked on the tube body, the tube cover comprising an inner cover embedded in the tube body, and an outer cover disposed outside the inner cover and movably connected to the outside of the tube body;

[0011] A sliding nail is arranged on the inner side of the outer cover, and an expansion node and a bursting node are arranged on the outside of the tube body in sequence from bottom to top, and the bursting node is arranged at the bottle edge of the tube body. When the air pressure in the tube body increases, the sliding nail slides through the expansion node and presses to the bottom of the bursting node;

[0012] An air guide hole is provided at the position where the inner cover fits the tube body, and the air guide hole just connects the tube body with the external space when the sliding nail contacts the blasting node.

[0013] As a further improvement, a pressure sensor is fixed inwardly in the middle of the expansion node, and a warning light is provided on the pressure sensor. When the pressure sensor is pressurized and energized, the warning light lights up, and the pressure sensor is electrically connected to the pressure device on the pressurized channel.

[0014] As a further improvement, the inner cover and the outer cover are connected and fixed by a plurality of connecting rods.

[0015] As a further improvement, the locking piece is a locking bolt that can be adapted to be inserted into the tube body, an axial through hole is provided in the locking bolt, and a pressing head is formed at one end of the locking bolt, and a threaded portion is formed at the other end, the opening is provided at the center of the bottom of the tube body, the threaded portion of the locking bolt passes downward through the opening, and an internal thread structure that is adapted to the threaded portion of the locking bolt is provided on the inner wall of the pressurized channel of the fixed seat, so that the thread of the threaded portion cooperates with the thread of the internal thread structure of the pressurized channel, and the tube body is detachably locked on the fixed seat by the pressing head.

[0016] As a further improvement, the fixing seat is provided with a groove for the bottom of the tube body to fit in, and a sealing ring is arranged between the bottom of the tube body and the fixing seat, and the pressing head is formed with a plurality of annular ribs for improving the sealing performance between the pressing head and the inner wall of the tube body.

[0017] As a further improvement, the locking piece is a locking block, which is detachably connected to the fixing seat from the side by screws, and the locking block and the fixing seat cooperate with each other to form a clamping and positioning structure, so that the tube body can be detachably clamped and positioned on the fixing seat by the tightening force of the locking block.

[0018] As a further improvement, the opening is opened at the peripheral side of the tube body and is adapted to be connected with the pressurized channel on the fixed seat. A sealing groove is opened at the pressurized channel port of the fixed seat, and a sealing ring is provided in the sealing groove for improving the sealing performance of the connection between the opening of the tube body and the pressurized channel.

[0019] As a further improvement, the pressurized channel also includes an internal reverse flow structure close to the internal thread structure, and an external reverse flow structure is arranged on the side of the internal reverse flow structure close to the entrance of the pressurized channel. The pressure-applying device fills the tube body with high-pressure medium after passing through the external reverse flow structure and the internal reverse flow structure.

[0020] As a further improvement, the internal reverse flow structure includes a first hinge hinged on the inner wall of the pressurized channel, and an arc-shaped bucket hinged in the first hinge, and the two arc-shaped buckets are combined to form a conical structure with the tip facing the tube body.

[0021] As a further improvement, the external counterflow structure includes a second hinge hinged on the inner wall of the pressure channel, a frustum plate hinged in the second hinge, and the two frustum plates are combined to form a frustum structure with an upper bottom facing the entrance of the pressurized channel, and the upper bottom of the frustum structure is recessed inward.

[0022] The beneficial effects of the present invention are:

[0023] The present invention provides a tube cover, when the water sample stored in the sample preservation tube expands, the inner cover will be first pushed outward, and then the inner cover will drive the outer cover to move away from the tube body, driving the sliding pin to slide. When the sliding pin is blocked by the expansion node, it indicates that the tube body has reached the specified volume upper line at this time, and when the sliding pin passes through the expansion node, it indicates that gas expansion has occurred in the tube body at this time, and when the sliding pin slides to the bursting node, it indicates that the tube cover has reached the bearing limit of the tube body, and further pressure may cause the cover to burst. Through clear distance changes in different stages, the detection personnel can intuitively, quickly and in real time understand the specific pressure data of the sample preservation tube, so as to improve the accuracy of the detection data.

[0024] The present invention provides an air guide hole. When the sliding nail slides to the blasting node, the air guide hole at this time happens to expose the tube body, allowing the inside of the tube body to communicate with the outside. That is, when the maximum bearing pressure is reached, the expanded gas in the tube body can be discharged through the air guide hole, which not only avoids serious deformation and damage to the tube cover, but also prevents the test gas and gas in the sample preservation tube from splashing to the outside to pollute the internal environment, which is more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a three-dimensional structural schematic diagram of a tube cover sealing performance detection structure of a safe and pollution-free water sample storage tube provided in Example 1 of the present invention.

[0027] Figure 2 It is an exploded view of a tube cover sealing performance detection structure for a safe and pollution-free water sample storage tube provided in Example 1 of the present invention.

[0028] Figure 3 The present invention Figure 2 An exploded view from another angle.

[0029] Figure 4 It is a cross-sectional view of a tube cover sealing performance detection structure of a safe and pollution-free water sample storage tube provided in Example 1 of the present invention.

[0030] Figure 5 This is a first motion state diagram of a tube cover sealing performance detection structure for a safe and pollution-free water sample storage tube provided in Example 1 of the present invention.

[0031] Figure 6 It is a schematic diagram of a second motion state of a tube cover sealing performance detection structure of a safe and pollution-free water sample storage tube provided in Example 1 of the present invention.

[0032] Figure 7 The present invention Figure 6 A magnified schematic diagram of area A in the middle.

[0033] Figure 8 It is a schematic diagram of the internal structure of a pressurized channel of the present invention.

[0034] Fig. 9 It is a schematic diagram of the structural changes of a transmission pipe of a pressure-applying device of the present invention after entering a pressurizing channel.

[0035] Fig.10 It is a three-dimensional structural schematic diagram of a tube cover sealing performance detection structure of a safe and pollution-free water sample storage tube provided in Example 2 of the present invention.

[0036] Fig.11 It is an exploded view of a tube cover sealing performance detection structure for a safe and pollution-free water sample storage tube provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0037] In order to make the embodiments of the present invention, all belong to the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0038] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as referring to the purpose, technical solutions and advantages of the methods. To be more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work indicate or imply relative importance or implicitly indicate the number of indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0039] Existing water sample collection tubes are all connected by threads. Although the sealing performance is guaranteed, when dealing with some water samples containing expandable gas, the tightly fitting structure becomes one of the disadvantages of being unable to adjust adaptively. In addition, due to the rotation mechanism of the thread itself, it is difficult to automatically adjust horizontally when the gas in the water sample expands, and it is difficult to feedback the pressure change in the sample storage tube. It is difficult for the tester to detect the pressure bearing capacity of the sample storage tube. In order to solve the above technical problems, the applicant proposes the following technical solutions:

[0040] Reference Figure 1-11As shown, a tube cover sealing performance detection structure for a safe and pollution-free water sample storage tube comprises: a fixing seat 1, a locking member, and a sleeve 2 detachably connected to the fixing seat 1; a sample storage tube 5 fixed to the fixing seat 1 by the locking member and covered by the sleeve 2, the sample storage tube 5 is provided with an opening 510, the fixing seat 1 is provided with a pressurizing channel 11 that is adapted to be sealed and docked with the opening 510 on the tube body 51 so as to allow a high-pressure medium to pass into the tube body 51; a tube cover 52 locked on the tube body 51, the tube cover 52 comprises an inner cover 521 embedded in the tube body 51, a cover arranged outside the inner cover 521 and connected to the tube body 51 An outer cover 522 with an external movable connection; a sliding nail 5221 is provided on the inner side of the outer cover 522, and an expansion node 511 and a bursting node 512 are provided on the outside of the tube body 51 in sequence from bottom to top, and the bursting node 512 is provided at the bottle edge of the tube body 51, and the sliding nail 5221 slides through the expansion node 511 and presses to the bottom of the bursting node 512 when the air pressure in the tube body 51 increases; an air guide hole 5211 is provided at the position where the inner cover 521 and the tube body 51 are in contact, and the air guide hole 5211 just connects the tube body 51 with the external space when the sliding nail 5221 is in contact with the bursting node 512.

[0041] At the beginning of the assembly process, first, select the sample preservation tube 5 to be collected. At this time, first cover the inner cover 521 and the outer cover 522 of the tube cover 52 into the sample preservation tube 5, mark the position of the sliding pin 5221 at this time, and then set the positions of the expansion node 511 and the bursting node 512 on the sample preservation tube 5, wherein the position of the expansion node 511 is located above the sliding pin 5221. The purpose of this setting is to enable rapid strain action after the gas expands and rushes in, prompting the detection personnel that expansion gas is generated in the sample preservation tube 5 at this time, and the position of the bursting node 512 is set at the bottle edge of the sample preservation tube 5. The purpose of this setting is that the amount of expansion gas generated at this time is close to the edge of the "burst cover", and the pressure in the sample preservation tube 5 at this time reaches the bearing limit of the sample preservation tube 5. This type of sample preservation tube 5 is not suitable for the detection of this type of water sample. Through the setting of the two nodes, it can fully reflect the two phenomena of expansion gas generation and excessive expansion gas that easily causes the tube cover 52 to burst.

[0042] Before testing, the fixing seat 1 and the sample preservation tube 5 are first connected together by a locking piece, and then the inner cover 521 of the tube cover 52 is embedded in the interior of the tube body 51, and the outer cover 522 of the tube cover 52 is slightly opened outward to enclose the expansion node 511 and the bursting node 512, and at least be located below the expansion node 511, thereby completing all installation preparations.

[0043] When testing is required, high-pressure medium is input into the tube body 51 through the pressurizing channel 11 and the opening 510 to increase the pressure inside the tube body 51 and reach a certain value. The high-pressure medium injected through the pressure-applying device Z is liquid at first, and is changed to gas input when it reaches the tube body 51, simulating the phenomenon of gas expansion in the water sample after collection. When the gas is injected, the gas will lift the inner cover 521 through the tube body 51, thereby driving the outer cover 522 to move. Once the outer cover 522 moves, the sliding pin 5221 will also be displaced. When a small amount of gas is initially injected, at this time, due to The two ends of the expansion node 511 are arc structures with a certain gradient. Therefore, when a small amount of gas acts, the sliding pin 5221 cannot temporarily break through the expansion node 511. At this time, it simulates the residual space after the tube body 51 is filled with water samples. After the gas continues to flow in, the sliding pin 5221 will break through the limitation of the expansion node 511 and slide between the expansion node 511 and the bursting node 512. At the moment when the sliding pin 5221 breaks through, the inspector can determine the optimal pressure-bearing capacity of this type of sample preservation tube 5 by observing the air pressure strength of the pressure-applying device Z.

[0044] However, although the optimal bearing pressure of this type of sample preservation tube 5 has been reached at this time, the maximum bearing pressure of this type of sample preservation tube 5 has not been reached. Therefore, in order to detect the maximum bearing pressure of this type of sample preservation tube 5, gas can continue to be input through the pressure-applying device Z, and the sliding nail 5221 will slide between the expansion node 511 and the bursting node 512 until it touches the expansion node 511. At this time, if the sliding nail 5221 is still sliding, it will lose the contact surface with the tube body 51, so that the entire tube cover 52 will fall off the tube body 51. Therefore, the pressure on the pressure-applying device Z at this time is the maximum bearing pressure of this type of sample preservation tube 5. When the gas in the sample preservation tube 5 reaches this critical pressure value, the sample preservation tube 5 is at risk of bursting.

[0045] In this embodiment, the bursting node 512 is an arc-shaped block in the figure, but in actual application, the bursting node 512 can also be a convex point, a block, or a plate. As long as it can block the sliding pin 5221, it can prevent the tube cover 52 from falling off and detect the maximum bearing pressure of the sample preservation tube 5.

[0046] In addition, when the sliding pin 5221 reaches the bursting node 512, it means that the sample preservation tube 5 has reached its load limit. If the inspector does not turn off the pressure device Z in time after checking the data, the sliding pin 5221 may destroy the bursting node 512. Therefore, an air guide hole 5211 is provided at the position where the inner cover 521 and the tube body 51 are fitted. When the sliding pin 5221 reaches the position of the bursting node 512, the air guide hole 5211 also exposes the tube body 51 and communicates with the space in the sleeve 2, so that the gas can be discharged, thereby better protecting the tube cover 52 from damage. At the same time, due to the protective effect of the sleeve 2, the liquid and gas will not leak to the outside, thereby preventing gas and liquid leakage and better protecting the environment.

[0047] In order to make the phenomenon of the sliding nail 5221 breaking through the expansion node 511 more obvious and enable the inspector to obtain the data of the best pressure resistance more accurately, a pressure sensor 513 is fixed inwardly in the middle of the expansion node 511, and a warning light is arranged on the pressure sensor 513. When the pressure sensor 513 is pressurized and energized, the warning light lights up, and the pressure sensor 513 is electrically connected to the pressure device Z on the pressurized channel 11. When the sliding nail 5221 slides through the expansion node 511, it will stay at the pressure sensor 513 for a short time, causing pressure on the pressure sensor 513, so that it is energized, and the power signal is transmitted to the chip connected to it, causing the warning light on the pressure sensor 513 to light up, so that the inspector can intuitively know that the pressure value in the tube body 51 at this time is the optimal value. At the same time, the pressure sensor 513 will transmit the signal to the pressure device Z, causing the pressure device Z to be temporarily shut down, so that the inspector can record the data.

[0048] In this embodiment, since the expansion node 511 feeds back the initial expansion node of the tube body 51, the sample loaded inside the tube body 51 will expand, and the expansion node 511 will be subject to the pressure of the sliding pin 5221, and the sliding pin 5221 will pass through the expansion node 511. Therefore, the expansion node 511 only uses an elastic material similar to silicone, and there is a certain obstruction when the sliding pin 5221 passes through, and at the same time, it has a certain elasticity sufficient to pass through. On the contrary, since the bursting node 512 is the last "defense line" before the tube cover 52 bursts, the bursting node 512 is a hard material, such as metal, ceramic, hard plastic and other structures. When the sliding pin 5221 slides to this place, it will be hard blocked by the bursting node 512 and cannot pass through. Through the combination of soft first and hard later, the integrity of the detection instrument can be preserved without affecting the detection accuracy, and it also adapts to the current concept of green environmental protection, does not cause sample leakage, and kills two birds with one stone.

[0049] Among them, the power supply and signal transmission principles of the pressure sensor 513 are well known to people in the mechanical field and are common technologies in this field, so they will not be described in detail here. In this embodiment, the pressure-applying device Z can be a pressure pump that can transport liquid media and gaseous media. The gaseous medium can be air or an inert gas, and the liquid medium can be pure water or mineral water. Of course, the gaseous medium and the liquid medium can also be real chemical reagents or water samples, and there is no specific limitation here.

[0050] When the gas filled in the inner cover 521 pushes up, in order to allow the inner cover 521 and the outer cover 522 to move synchronously, the inner cover 521 and the outer cover 522 are connected and fixed by a plurality of connecting rods 523, and the connecting rods 523 are evenly distributed at equal distances to ensure that the inner cover 521 can smoothly push up the outer cover 522 from all directions.

[0051] In this case, the locking parts have two forms, specifically:

[0052] Embodiment 1

[0053] Please refer to the attached Figure 1 To Attachment Fig. 9 In one preferred embodiment, the locking member is a locking bolt 3 that can be adapted to be inserted into the tube body 51, an axial through hole 31 is provided in the locking bolt 3, and a pressing head 32 is formed at one end of the locking bolt 3, and a threaded portion 33 is formed at the other end, an opening 510 is provided at the center of the bottom of the tube body 51, the threaded portion 33 of the locking bolt 3 passes through the opening 510 downward, and an internal thread structure adapted to the threaded portion 33 of the locking bolt 3 is provided on the inner wall of the pressurized channel 11 of the fixing seat 1, so that the thread of the threaded portion 33 cooperates with the thread of the internal thread structure of the pressurized channel 11, and the tube body 51 is detachably locked on the fixing seat 1 by the pressing head 32. It can be understood that, in this embodiment, the locking member has a pressing head 32 at one end and a screw connection portion 33 at the other end, and the locking member can be inserted into the tube body 51. Through the screw connection between the locking member inserted into the tube body 51 and the external fixing seat 1, the tube body 51 is firmly locked on the fixing seat 1 and the opening 510 on the bottom of the tube body 51 is adapted to be connected with the pressurized channel 11 on the fixing seat 1, thereby forming a bottom-mounted tube cover sealing performance detection device. Preferably, a hexagonal structure is provided on the pressing head 32 of the locking member, through which a hexagonal wrench can be conveniently used to screw the locking member and the fixing seat 1 together, thereby positioning the tube body 51 of the sample storage tube 5 to be tested on the fixing seat 1.

[0054] Please refer to the attached Figure 1 To Attachment Fig. 9In one preferred embodiment, a groove 12 is provided on the fixing seat 1 for the bottom of the tube body 51 to fit in, and a sealing ring is provided between the bottom of the tube body 51 and the fixing seat 1. Preferably, a plurality of annular convex ribs 321 are formed on the pressing head 32 to improve the sealing performance between the pressing head 32 and the inner wall of the tube body 51. It can be understood that in this embodiment, the mutual cooperation between the annular convex ribs 321 and the sealing ring on the opposite side can play a stable and good sealing role in the connection between the bottom of the tube body 51 and the fixing seat 1, thereby ensuring the stability of the high-pressure medium passing into the tube body 51 through the pressurized channel 11 and the accuracy of the pressure value.

[0055] Please refer to the attached Figure 1 To Attachment Figure 3 In one preferred embodiment, the sleeve 2 is detachably fixed to the fixing base 1 by screws. Preferably, an opening is provided at the end of the sleeve 2.

[0056] Embodiment 2

[0057] Please refer to the attached Fig.10 To Attachment Fig.11 The difference between this embodiment and the first embodiment is that the locking member is a locking block 4, which is detachably connected to the fixing seat 1 from the side by screws, and the locking block 4 and the fixing seat 1 cooperate with each other to form a clamping and positioning structure, so that the tube body 51 can be detachably clamped and positioned on the fixing seat 1 by the tightening force of the locking block 4. The opening 510 is opened at the circumferential side of the tube body 51 and is adapted to be connected with the pressurized channel 11 on the fixing seat 1. It can be understood that in this embodiment, the opening 510 is opened on the side of the tube body 51, and the locking member is a locking block 4 structure, and the tube body 51 is clamped and locked from the side, thereby forming a side-mounted tube cover sealing performance detection device. In this embodiment, the tube cover sealing performance detection device can be used for both empty tube detection and tube cover sealing performance detection of sample storage tubes 5 with liquid already filled in the tube body 51.

[0058] Please refer to the attached Fig.10 To Attachment Fig.11 In one preferred embodiment, a sealing groove 13 is provided at the end of the pressurized channel 11 of the fixing seat 1, and a sealing ring is provided in the sealing groove 13 for improving the sealing performance between the opening 510 of the tube body 51 and the pressurized channel 11.

[0059] In addition, no matter whether the first embodiment or the second embodiment is adopted, it is necessary to flush the external high-pressure medium through the pressure device Z through the pressure channel 11. However, there are two problems in the flushing process. One problem is that after the punching device is connected, external gas will enter, thereby affecting the data accuracy of the pressure device Z. The part of the air that enters will increase the data on the pressure device Z, causing the detected data to be inaccurate. Another problem is that when the input pipe of the pressure device Z is withdrawn from the pressure channel 11, part of the water sample will be taken out, and the gas and liquid therein are easy to overflow into the surrounding environment. If the water sample contains harmful substances, it is easy to damage the surrounding environment, and may cause serious pollution. In order to solve the above technical problems, the The pressurized channel 11 also includes an internal reflow structure 111 close to one side of the internal thread structure, and an external reflow structure 112 is provided on one side of the internal reflow structure 111 close to the entrance of the pressurized channel 11. The pressure device Z fills the tube body 51 with high-pressure medium after passing through the external reflow structure 112 and the internal reflow structure 111. When the pressurized channel 11 is connected, the external reflow structure 112 separates the channel from the outside, and when the pressurized channel 11 is withdrawn, the internal reflow structure 111 separates the internal channel, so that the internal and external environments are separated during the connection or withdrawal process, and liquid and gas can be better filled without affecting the surrounding environment, making the entire detection process more environmentally friendly. The specific separation scheme is as follows:

[0060] During the process of connecting the input pipe, the external counterflow structure 112 includes a second hinge 1121 hinged on the inner wall of the pressurized channel 11, and a truncated cone piece 1122 hinged in the second hinge 1121. The two truncated cone pieces 1122 are combined to form a truncated cone structure with the upper bottom facing the entrance of the pressurized channel 11, and the upper bottom of the truncated cone structure is recessed inward. When the pressurized channel 11 is connected, it can be seen from the figure that the front end of the input pipe of the pressure-applying device Z is arc-shaped, and its arc-shaped structure will push open the truncated cone structure formed by the two truncated cone pieces 1122. As the input pipe continues to go deeper, the truncated cone piece 1122 will gradually rotate along the second hinge 1121, but the truncated cone piece 1122 is always close to the input pipe to prevent external gas from entering. It can be seen from the figure that the truncated cone structure formed by the two truncated cone pieces 1122 is recessed, which is a double-layer recess. Therefore, when opening, the first layer is pushed open first, and then the second layer is pushed open. It will not be completely opened at one time, which can largely avoid the occurrence of air leakage.

[0061] During the process of pulling out the input tube, the internal reflux structure 111 includes a first hinge 1111 hinged on the inner wall of the pressurized channel 11, and an arc-shaped bucket 1112 hinged in the first hinge 1111. The two arc-shaped buckets 1112 are combined to form a conical structure with the tip facing the tube body 51. When the input tube is about to be pulled out, in order to avoid entraining the gas and liquid to be detected, the two arc-shaped buckets 1112 always clamp the input tube when the input tube is squeezed in. When the input tube is pulled out, the arc-shaped bucket 1112 will slowly close along the arc structure at its top. The two first hinges 1111 also always provide a pressing force inward, so that the input tube will not entrain any substance to the outside during the withdrawal process.

[0062] Through the above two settings, the external pressure device Z can maintain a completely separated state between the inside and the outside when connected to the pressurized channel 11, which not only maintains the accuracy of the detection, but also prevents the detection reagent from flowing out of the sample storage tube 5 to cause pollution, making it more environmentally friendly and durable.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A safe and pollution-free water sample storage tube cover sealing performance detection structure, characterized in that: include: A fixing seat (1), a locking member, and a sleeve (2) detachably connected to the fixing seat (1); A sample storage tube (5) fixed to the fixing seat (1) by a locking member and covered by a sleeve (2), wherein the sample storage tube (5) is provided with an opening (510), and the fixing seat (1) is provided with a pressurizing channel (11) adapted to seal and butt with the opening (510) on the tube body (51) to allow a high-pressure medium to pass into the tube body (51); a tube cover (52) locked on the tube body (51), the tube cover (52) comprising an inner cover (521) embedded in the tube body (51), and an outer cover (522) disposed outside the inner cover (521) and movably connected to the outside of the tube body (51); A sliding nail (5221) is arranged on the inner side of the outer cover (522); an expansion node (511) and a bursting node (512) are arranged on the outside of the tube body (51) in sequence from bottom to top; the bursting node (512) is arranged at the bottle edge of the tube body (51); when the air pressure in the tube body (51) increases, the sliding nail (5221) slides through the expansion node (511) and presses to the bottom of the bursting node (512); An air guide hole (5211) is provided at a position where the inner cover (521) and the tube body (51) are in contact with each other, and the air guide hole (5211) connects the tube body (51) and the external space when the sliding pin (5221) contacts the blasting node (512).

2. The sealing performance detection structure of the tube cover of a safe and pollution-free water sample storage tube according to claim 1, characterized in that: A pressure sensor (513) is fixedly disposed inwardly in the middle of the expansion node (511), and a warning light is disposed on the pressure sensor (513). When the pressure sensor (513) is pressurized and energized, the warning light lights up, and the pressure sensor (513) is electrically connected to the pressure device (Z) on the pressurizing channel (11).

3. The sealing performance detection structure of the tube cover of a safe and pollution-free water sample storage tube according to claim 2, characterized in that: The inner cover (521) and the outer cover (522) are connected and fixed via a plurality of connecting rods (523).

4. The safe and pollution-free water sample storage tube cover sealing performance detection structure according to claim 3, characterized in that: The locking member is a locking bolt (3) that can be adapted to be inserted into the tube body (51). An axial through hole (31) is formed in the locking bolt (3), and a pressing head (32) is formed at one end of the locking bolt (3), and a threaded portion (33) is formed at the other end. The opening (510) is formed at the center of the bottom of the tube body (51), and the threaded portion (33) of the locking bolt (3) passes through the opening (510) downward. An internal thread structure that is adapted to the threaded portion (33) of the locking bolt (3) is formed on the inner wall of the pressurizing channel (11) of the fixing seat (1), so that the threaded portion (33) and the internal thread structure of the pressurizing channel (11) are matched, and the tube body (51) is detachably locked on the fixing seat (1) by the pressing head (32).

5. The sealing performance detection structure of the tube cover of a safe and pollution-free water sample storage tube according to claim 4, characterized in that: The fixing seat (1) is provided with an embedding groove (12) for the bottom of the tube body (51) to fit in, and a sealing ring is provided between the bottom of the tube body (51) and the fixing seat (1). The pressing head (32) is provided with a plurality of annular convex ribs (321) for improving the sealing performance between the pressing head (32) and the inner wall of the tube body (51).

6. A safe and pollution-free water sample storage tube cover sealing performance detection structure according to any one of claims 1 to 3, characterized in that: The locking member is a locking block (4), which is detachably connected to the fixing seat (1) from the side by means of screws, and the locking block (4) and the fixing seat (1) cooperate with each other to form a clamping and positioning structure, so that the tube body (51) can be detachably clamped and positioned on the fixing seat (1) by the tightening force of the locking block (4).

7. The safe and pollution-free water sample storage tube cover sealing performance detection structure according to claim 6, characterized in that: The opening (510) is provided at a position on the circumferential side of the tube body (51) and is adapted to be connected with the pressurized channel (11) on the fixing seat (1). A sealing groove (13) is provided at the end of the pressurized channel (11) of the fixing seat (1). A sealing ring is provided in the sealing groove (13) for improving the sealing performance of the connection between the opening (510) of the tube body (51) and the pressurized channel (11).

8. The sealing performance detection structure of the tube cover of a safe and pollution-free water sample storage tube according to claim 4, characterized in that: The pressurizing channel (11) further comprises an inner reverse flow structure (111) close to the inner thread structure, and an outer reverse flow structure (112) is arranged on the inner reverse flow structure (111) close to the entrance of the pressurizing channel (11). The pressure applying device (Z) fills the tube body (51) with a high-pressure medium after passing through the outer reverse flow structure (112) and the inner reverse flow structure (111).

9. The safe and pollution-free water sample storage tube cover sealing performance detection structure according to claim 8, characterized in that: The internal reverse flow structure (111) comprises a first hinge (1111) hinged to the inner wall of the pressurizing channel (11), and an arc-shaped bucket (1112) hinged inside the first hinge (1111), wherein the two arc-shaped buckets (1112) are combined to form a conical structure with the tip facing the tube body (51).

10. The safe and pollution-free water sample storage tube cover sealing performance detection structure according to claim 8, characterized in that: The external counterflow structure (112) comprises a second hinge (1121) hinged on the inner wall of the pressure channel (11), and a frustum plate (1122) hinged inside the second hinge (1121); the two frustum plates (1122) are combined to form a frustum structure with an upper bottom facing the entrance of the pressure channel (11); the upper bottom of the frustum structure is concave inwards.

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