CN116237105A - A sample collection tube - Google Patents

Abstract

The invention relates to the field of sample collection, in particular to a sample collection tube, which includes a tube body with a sample storage chamber inside and an outlet connected to the sample storage chamber at the lower part, a valve core is arranged in the outlet, and the side of the valve core The wall is provided with a feed hole, and the bottom is provided with a discharge hole. The outer peripheral surface of the valve core is fixed with a sealing assembly that extends around the valve core and closely cooperates with the inner wall surface of the outlet to form a sealing structure. The outlet of the outlet moves axially, so as to have an open position and a closed position. When the valve core is in the closed position, the feed hole faces the inner wall of the outlet, and the upper part of the feed hole is sealed by a sealing assembly to prevent the sample in the sample storage chamber Enter the discharge hole; when the valve core is in the open position, the feed hole is in the sample storage chamber, and the lower part of the feed hole is closed by a sealing component to prevent the sample in the sample storage chamber from entering the gap between the side wall of the valve core and the inner wall of the outlet . The invention solves the problem of sample leakage from the bottom.

Description

A sample collection tube

technical field

The invention relates to the field of sample collection, in particular to a sample collection tube.

Background technique

On-site collection of biological samples can provide valuable information for scientists, physicians, geneticists, epidemiologists, or the like. For example, obtaining fresh samples of a patient's blood, purulent secretions, or sputum can help a doctor or epidemiologist isolate or identify the causative agent of an infection. There are already a large number of documents in the prior art disclosing devices that can be used for sample collection. These devices usually require users to take samples and then hand them over to professional personnel for further processing.

When processing certain types of samples, it is necessary to transfer the samples in the collection device to the collection device first, and then perform corresponding detection on the samples in the collection device. For example, the Chinese invention patent application (CN114323736A) discloses a stool sample collection device, which includes a collection tube for collecting the sample and a collection tube for collecting the mixed sample in the collection tube, wherein the collection tube includes a tube body, A detachable tube cover arranged at the top opening of the tube body, fixedly connected to the tube cover and a sampler extending into the tube body, the bottom of the tube body is provided with an outlet for sample discharge, and a protective film is provided on the outlet. When the collection tube is in use, the sample to be collected is sampled by the sampler, and then the sample is put into the tube body, and the opening of the tube body is sealed by the tube cover, so that the sample is stored in the tube body. Professionals then perform pretreatment including mixing and lysing. After completion, the protective film at the bottom of the tube body is punctured through the collection tube to transfer the sample into the collection tube for subsequent detection.

It is noted that most samples are in a liquid state or a solid-liquid mixed state after pretreatment in the collection tube, so when the protective film at the bottom of the tube body is punctured, the sample can flow into the collection tube smoothly, but then There are also corresponding problems, one of which is that when the collection tube is taken out from the collection tube, the sample remaining in the tube body will leak from the bottom.

Contents of the invention

In order to solve the above-mentioned problem of sample leakage from the bottom, the object of the present invention is to provide a sample collection tube, which is provided with a one-way valve structure at the bottom of the tube body. Only when the sample needs to be discharged outward, the spool of the one-way valve In the open position, the sample is discharged outwards, and in other states, the sample is sealed by the one-way valve and cannot leak from the bottom.

For the purpose of the present invention, adopt following technical scheme to implement:

A sample collection tube, comprising a tube body with a sample storage chamber inside and an outlet connected to the sample storage chamber at the lower part, a valve core is arranged in the outlet, a feed hole is arranged on the side wall of the valve core, and a bottom A discharge hole is provided, and the outer peripheral surface of the valve core is fixed with a sealing assembly that extends circumferentially around the valve core and closely cooperates with the inner wall surface of the outlet to form a sealing structure. The valve core moves axially in the outlet, thereby having The open position and the closed position, when the valve core is in the closed position, the feed hole faces the inner wall of the outlet, and the upper part of the feed hole is closed by a sealing component, preventing the sample in the sample storage chamber from entering the discharge hole; the valve core is in the open position position, the feeding hole is in the sample storage chamber, and the lower part of the feeding hole is closed by the sealing assembly, preventing the samples in the sample storage chamber from entering the gap between the side wall of the valve core and the inner wall of the outlet.

Preferably, the sealing assembly includes a first sealing ring arranged above the feeding hole and a second sealing ring arranged below the feeding hole. When the valve core is in the closed position, the outer periphery of the first sealing ring closely fits on the outlet On the inner wall of the feed hole, so as to close the top of the feed hole; when the valve core is in the open position, the first sealing ring is separated from the outlet, and the outer periphery of the second sealing ring is closely fitted on the inner wall of the outlet, so that the feed The bottom of the hole is closed.

Preferably, the outer diameters of the first sealing ring and the second sealing ring are larger than the inner diameter of the outlet, so as to form an interference fit, so that the outer circumferences of the first sealing ring and the second sealing ring are closely fitted on the inner diameter of the outlet. on the inner wall.

Preferably, above and below the feed hole on the side wall of the spool, there are respectively provided a first installation part and a second installation part extending around the circumference and recessed radially inward to form a ring. The first sealing ring It is arranged in the first installation part, and the second sealing ring is arranged in the second installation part.

Preferably, the first sealing ring and the second sealing ring are integrated, and a connecting part is fixedly arranged between the first sealing ring and the second sealing ring, and the connecting part makes the distance between the first sealing ring and the second sealing ring relatively fixed.

Preferably, the connecting portion is connected between the first sealing ring and the second sealing ring around the circumferential direction, and a feeding port corresponding to the position of the feeding hole is formed on the connecting portion.

Preferably, a first annular flange and a second annular flange extending around the circumference and protruding radially outward are respectively provided above and below the feed hole on the side wall of the spool, and above the first annular flange A first annular area for limiting the first sealing ring is formed, a second annular area for limiting the second sealing ring is formed under the second annular flange, and the inner wall of the connecting part is provided with a and the second annular flange to adapt to the limit groove.

Preferably, the top of the valve core is provided with a first stopper, the first stopper is located in the sample storage chamber, the top of the outlet is provided with a second stopper, and in the radial direction of the outlet, the first stopper and the second stopper The two stoppers partially overlap, so that when the first stopper and the second stopper abut, a stopper structure is formed;

The bottom of the valve core is provided with a third stopper, the bottom of the outlet is provided with a fourth stopper, the fourth stopper is located above the third stopper, and in the radial direction of the outlet, the third stopper and The fourth stop part overlaps, so that when the third stop part and the fourth stop part contact, a stop structure is formed.

Preferably, the outer periphery of the valve core is provided with an elastic element, the upper end of the elastic element abuts against the pipe body, and the lower end of the elastic element abuts against the valve core, thereby exerting downward pressure on the valve core to keep the valve core closed. Location.

As a preference, an airtight assembly that closes the discharge hole is provided in the discharge hole; a filter plate adapted to the inner diameter of the sample storage cavity is provided in the sample storage cavity, and several penetrating holes are provided on the filter plate. The filter holes on the upper and lower surfaces, the bottom of the filter plate is provided with a filter screen, the center of the bottom of the filter plate is provided with a connecting rod extending axially downward, the lower end of the connecting rod abuts against the top surface of the valve core; A limiting step surface protruding radially inward and used for limiting the filter plate is provided.

Compared with the prior art, the beneficial effect of the present invention is: by setting a one-way openable valve core in the outlet at the bottom of the tube body, the discharge of the sample can be realized, and by setting the first sealing ring and the second sealing ring on the valve core. The sealing ring ensures that no matter whether the valve core is in an open state or a closed state, the sample in the sample storage chamber can be prevented from leaking outward.

Description of drawings

Figure 1 is a perspective view of a sample collection tube.

Figure 2 is an exploded view of the sample collection tube.

Figure 3 is a schematic diagram of a sealing assembly disposed at the bottom of a sample collection tube.

Figure 4 is an exploded view of the seal assembly.

Fig. 5 is a cross-sectional view of the sample collection tube along line A-A in Fig. 1, and the bottom of the sample collection tube is in a closed state at this time.

Fig. 6 is a sectional view of the sample collection tube along line A-A in Fig. 1, and the bottom of the sample collection tube is in an open state at this time.

Figure 7 is a schematic diagram of a sample collection tube.

Fig. 8 is a cross-sectional view of the sample collection tube when it is connected to the bottom of the sample collection tube.

Detailed ways

As shown in Figures 1 and 2, the sample collection tube 10 of this embodiment includes a tube body 11 with a hollow cylindrical shape and a sample storage cavity 111 formed inside, which is detachably arranged on the top opening of the tube body 11 through thread fit. The tube cover 12 at 112, and the sampler 13 fixedly arranged in the tube cover 12 and extending downward along the axial direction of the tube cover 12, and can extend into the sample storage cavity 111 from the top opening 112, the structure of the sampler 13 There is no limitation here, and any structure with a sampling function in the prior art may be used, such as a spoon, a long rod-like structure shown in FIG. 2 , and the like. In addition, the sampler 13 can also be set separately instead of being connected to the tube cover 12 .

During use, the tube cover 12 is unscrewed from the top opening 112 of the tube body 11, thereby the sampler 13 is taken out from the sample storage cavity 111, and the sample is sampled through the sampler 13, and then the sampler 13 is re-installed from the top. Put it back into the sample storage cavity 111 in the opening 112 , and finally screw the tube cover 12 on the top of the tube body 11 to store the sample in the tube body 11 .

As mentioned in the background art, the bottom (or lower part) of the tube body 11 of this embodiment is also provided with an outlet 113 for the sample in the sample storage chamber 111 to be discharged outward (see FIG. 5 ), so as to facilitate the sample follow-up testing. However, it is noted that for most cases, the user of the above-mentioned sample collection tube 10 is the holder of the sample itself. Therefore, after the sampling is completed, the sample collection tube 10 needs to be handed over to a professional. During the process, it is necessary to ensure the tightness of the sample collection tube 10 . Secondly, before testing the sample, it is usually necessary to perform necessary operations such as mixing and cracking. During the process, it is also necessary to ensure that the sample collection tube 10 has a good sealing performance to prevent the sample from flowing out of the outlet 113 . Again, after the sample in the sample collection tube 10 is discharged from the outlet 113 , there will inevitably be sample residue inside the tube body 11 , and it is necessary to ensure that the residual sample cannot continue to flow out of the opening 113 .

In view of the possible leakage of the sample in the above-mentioned various situations, the outlet 113 of this embodiment faces downward and has a certain axial length, which ensures that the sealing device 20 can be arranged in the outlet 113, and the inner surface of the sealing device 20 and the outlet 113 The wall cooperates to form a one-way valve structure, so that when there is no discharge (the so-called discharge refers to the discharge of the sample from the position where the outlet 113 is located, more precisely, the discharge from the discharge hole 213 hereinafter), the sealing device 20 The outlet 113 is completely sealed; when discharging, the sealing device 20 is opened, and the sample can be discharged downward through the sealing device 20 in one direction.

As shown in FIGS. 2 and 3 , the sealing device 20 includes a valve core 21 disposed in the outlet 113 that can displace up and down in the outlet 113 and a valve core 21 fixedly arranged on the outer periphery of the valve core 21 and extending in the circumferential direction with the outlet 113 The inner wall surface of the inner wall tightly fits to form a sealing sleeve 22 (also called a sealing assembly) of a sealing structure.

Referring to Fig. 3, Fig. 4 and Fig. 5, the spool 21 is cylindrical as a whole, with a hollow cavity 211 (see Fig. 5) formed inside, and at least one feeding hole 212 communicating with the cavity 211 is provided on the outer peripheral surface. The bottom of the valve core 21 is provided with a discharge hole 213 communicating with the cavity 211 (see FIG. 5 ). The number and opening size of the feeding holes 212 can be selected according to actual needs.

As shown in Figures 4 and 5, the sealing sleeve 22 has two sealing rings distributed up and down and protruding radially outward. In this embodiment, the upper sealing ring is referred to as the first sealing ring 221, The lower sealing ring is designated as the second sealing ring 222, the outer peripheral surfaces of the first sealing ring 221 and the second sealing ring 222 are tightly abutted against the inner wall of the outlet 113, and the first sealing ring is located above the feed Above the hole 212 , the second sealing ring 222 is located below the feeding hole 212 .

The valve core 21 in this embodiment has a closed position and an open position. In the closed position, the sample is kept in the sample storage chamber 111. In the open position, the sample moves downward from the sample storage chamber 111 through the valve core 21 and then from the bottom. discharge.

Figure 5 shows a cross-sectional view of the valve core 21 in the closed position, as can be seen from the figure, when the valve core 21 is in the closed position, the feed hole 212 is in the outlet 113, and the first sealing ring 221 is tight Fitting on the inner wall of the opening 113 , the sample is blocked by the first sealing ring 221 and cannot flow down into the feeding hole 212 , that is, the sample cannot be discharged from the sample storage chamber 111 .

Figure 6 shows a cross-sectional view of the valve core 21 when it is in the open position. It can be seen from the figure that when the valve core 21 is in the open position, the valve core 21 moves upward relative to the closed position, so that the feed hole 212 is in contact with the sample. The storage cavity 111 is connected, so that the sample can enter the cavity 211 through the inlet hole 212 and finally be discharged from the outlet hole 213 below. In addition, it is also noted that the second sealing ring 222 is still tightly fitted on the inner wall of the opening 113, which makes the sample only be discharged from the feed hole 212, but not from the valve core 21 and the inner wall of the opening 113. Leaks in the gaps between.

It can be seen that the function of the first sealing ring 221 is to keep the sample in the sample storage chamber 111 in the sample storage chamber 111 when the valve core 21 is in the closed state (see FIG. 5 ), preventing the sample from flowing downward into the opening 113 In the gap between the valve core 21 and the feed hole 212 . The function of the second sealing ring 222 is to prevent the sample from flowing out from the gap between the opening 113 and the valve core 21 when the valve core 21 is in an open state (see FIG. 6 ). Therefore, by arranging the first sealing ring 221 and the second sealing ring 222 at the upper and lower positions of the feed hole 212, it is ensured that the valve core 21 can have a good sealing performance regardless of whether the valve core 21 is in an open state or a closed state. That is, after the above-mentioned sealing device 20 is set in the opening 113, no matter whether the sample collection tube 10 is in the collection process, storage state, pretreatment process or discharge process, the sample cannot directly flow out from the opening 113, ensuring The sample collection tube 10 has good sealing performance.

In order to facilitate the installation of the upper and lower sealing rings, as shown in FIG. and the second mounting portion 217 are annular grooves extending circumferentially around the valve core 21, thereby forming a first annular area 2161 and a second annular area 2171 above and below the feed hole 212, respectively, and the first sealing ring 221 and The second sealing rings 222 are respectively disposed in corresponding annular regions, so as to follow the valve core 21 to move up and down synchronously in the opening 113 .

Continuing to refer to FIG. 4 , the first annular area 2161 includes a first stepped surface 2162 constituting the upper boundary and a first annular flange 2163 constituting the lower boundary. protruding outward, thereby forming a downward facing plane, which limits the top of the first sealing ring 221 . The first annular flange 2163 is also integrally formed on the upper outer surface of the valve core 21 and is located at the upper part of the feed hole 212. The first annular flange 2163 protrudes radially outward, so that the first annular flange 2163 An upward facing plane is formed on the top surface, and the plane limits the bottom surface of the first sealing ring 221 .

Similar to the first annular area 2161, the second annular area 2171 includes a second annular flange 2172 constituting the upper boundary and a second stepped surface 2173 constituting the lower boundary. The second annular flange 2172 is integrally formed on the outside of the valve core 21. On the surface and below the feeding hole 212 , the second annular flange 2172 protrudes radially outwards, thereby forming a downward facing plane on the bottom surface of the second annular flange 2172 , the plane faces the second sealing ring 222 The top surface is limited. The second stepped surface 2173 is integrally formed on the outer peripheral surface of the valve core 21 and is located below the second annular flange 2172. The second stepped surface 2173 protrudes radially outwards to form a plane facing upwards. The bottom surface of the sealing ring 222 is limited.

Usually, under the action of the first annular area 2161 and the second annular area 2171, the first sealing ring 221 and the second sealing ring 222 can be ensured to be in the correct position, and follow the spool 21 to move up and down synchronously. After completion, the second sealing ring 222 is always tightly fitted on the inner wall of the opening 113, and the first sealing ring 221 will break away from the inner wall of the opening 113 when the valve core 21 is in the open position, that is, the first sealing ring 221 is on the inner wall of the valve core. 21 needs to enter or leave the inner wall of the opening 113 during the movement process, and the position of the first sealing ring 221 may be deviated during the process of entering and exiting, thus failing to play a sealing role. For this reason, in this embodiment, a connecting portion 223 for fixing the two together is provided between the first sealing ring 221 and the second sealing ring 222, so that the first sealing ring 221 and the second sealing ring 222 are integrally formed. , that is, the entire sealing sleeve 22 is a separate part, and the following technical effect can be obtained by setting the connecting part 223: in the process of the valve core 21 moving up and down, the first sealing ring 221 and the second sealing ring 222 are always affected by the connecting part tension (or pressure), so that the distance between the first sealing ring 221 and the second sealing ring 222 is relatively fixed, and because the second sealing ring 222 is always in contact with the inner wall of the opening 113, it can be relatively stable in the second In the annular area 2171, so that the first sealing ring 221 can also be relatively stably arranged in the first annular area 2161 to avoid deviating from the preset position.

In order to improve the connection strength between the first sealing ring 221 and the second sealing ring 222, the connecting portion 223 is preferably connected between the first sealing ring 221 and the second sealing ring 222 around the circumferential direction, such as shown in FIGS. 2 and 4 As shown, in this embodiment, the connecting part 223 includes two arc-shaped connecting blocks 2231, and the two arc-shaped connecting blocks 2231 are symmetrical between the first sealing ring 221 and the second sealing ring 222, and are connected between the two arc-shaped The feed port 224 corresponding to the feed hole 212 is formed at the junction of the block 2231, so that the sample can enter the feed hole 212 through the feed port 2231, avoiding that the sample cannot enter the feed hole 212 smoothly due to the existence of the connection part 223 . It should be noted that the number of arc-shaped connecting blocks 2231 is not limited to two, and can be increased or decreased to one according to actual conditions.

In the case where the above-mentioned connecting portion 223 is provided, in order to further improve the accuracy of the position of the connecting portion 223, the inner wall of the connecting portion 223 is provided with two limiting grooves 2232 distributed up and down and each radially inwardly recessed, The position of the limiting groove 2232 corresponds to the position of the first annular flange 2163 and the second annular flange 2172 above, so that when the limiting groove 2232 fits in the annular flange, the axial position of the connecting portion 223 is also relative. fixed, so as to prevent the connecting portion 223 from being displaced during the movement of the valve core 21 .

3 and 5, in order to ensure that the valve core 21 is limited when it is in the closed position and prevent the valve core 21 from falling out of the opening 113 downward, the top of the valve core 21 is provided with a first stopper 214, and the opening 113 The top is provided with a second stopper 114. In the axial direction of the opening 113, the first stopper 214 is located above the second stopper 114. In the radial direction of the opening 113, the two at least partially overlap, so that When the two abut against each other, a stop structure is formed to prevent the first stop portion 214 from entering the opening 113 downwards, that is, to prevent the valve core 21 from disengaging downward from the opening 21 .

Specifically, referring to FIG. 3 , the first stopper 214 is integrally formed on the hook 2141 on the top of the valve core 21. In this embodiment, there are three hooks 2141 (which can be increased or decreased according to actual needs) and surround the Evenly distributed in the circumferential direction, the hook 2141 has a first stop surface 2142 facing downward and extending outward along the horizontal direction, and a guide slope 2143 arranged on the upper part of the hook 2141 and extending obliquely. The first stop surface 2142 is used to communicate with The second stop surface 1141 hereinafter cooperates to stop. The inclined direction of the guide slope 2143 is that the upper end point is closer to the inner side of the radial direction than the lower end point. Such an inclined direction enables the hook 2141 to enter the opening 113 smoothly when the valve core 21 is installed. Referring to FIG. 5 , the second stop portion 114 is a horizontally extending and annular second stop surface 1141 , and the second stop surface 1141 abuts against the first stop surface 2142 to prevent the valve core 21 from continuing to move downward. .

3 and 5, in order to ensure that the valve core 21 is limited when it is in the open position and prevent the valve core 21 from entering the sample storage chamber 111 through the opening 113, the bottom of the valve core 21 is provided with a third stopper 215, and the opening 113 is provided with a fourth stopper 115 at the bottom of the opening 113. In the axial direction of the opening 113, the third stopper 215 is below the fourth stopper 115. In the radial direction of the opening 113, the two are at least partially overlapped. , so that when the two abut against each other, a stopper structure is formed to prevent the third stopper portion 215 from entering the opening 113 upwards, that is, to prevent the valve core 21 from moving upwards and entering the sample storage chamber 111 as a whole.

Specifically, referring to FIG. 3 , the third stop member 215 is an annular baffle 2151 integrally formed at the bottom of the valve core 21 and extending outward along the circumferential direction. Referring to FIG. 6 , the fourth stopper 115 is an annular bottom surface 1151 arranged at the bottom of the opening 113 and extending annularly. When the valve core 21 moves upward, the top surface of the annular baffle plate 2151 will abut against the annular bottom surface 1151 , thereby Further upward movement of the spool 21 is restricted to prevent the spool 21 from entering the sample storage cavity 111 as a whole.

In addition, note that the spool 21 should be in the closed position under normal conditions, so the spool 21 should have a tendency to move downwards so as to be held in the closed position.

As an optional way, the quality of the spool 21 can be increased, for example, the material with a higher density can be used to make the spool 21, so that under the action of gravity, the spool 21 will be kept in the closed position, and only the applied Only when the external force overcomes the gravity of the spool 21 and the frictional force between the seal ring and the inner wall of the opening 113 can the spool 21 be pushed upwards to move to the open position.

As a preference, in this embodiment, an elastic element 23 is arranged on the outer periphery of the valve core 21, and the elastic element 23 exerts a downward elastic force on the valve core 21, thereby keeping the valve core 21 in the closed position. When shifting, it is only necessary to overcome the elastic force. Specifically, referring to FIG. 5 and FIG. 6 , the elastic element 23 in this embodiment adopts a coil spring, but in other embodiments, an elastic sheet, an elastic pad made of rubber material, etc. may also be used. The lower end of the coil spring abuts against the top surface of the annular baffle 2151, and the upper end of the coil spring abuts against the lower part of the pipe body. More specifically, the bottom of the pipe body 11 is provided with a receiving port 116, the opening 113 is located inside the receiving port 116, and an axially extending connecting groove 117 is formed between the outer peripheral surface of the opening 113 and the receiving port 116, obviously the connecting groove 117 is also Extending around the circumference to form a ring, the upper end of the coil spring is located in the connecting groove 117, and the valve core 21 is located inside the receiving port 116, so as to prevent the valve core 21 from being exposed outside the pipe body 11 and prevent the valve core 21 from being easily damaged due to touch. open.

As shown in Figures 2 and 5, a filter plate 14 is also provided in the sample storage cavity 111. The filter plate 14 is disc-shaped, and its diameter is approximately equal to the inner diameter of the sample storage cavity 111. The filter plate 14 has several filter holes penetrating up and down. 141, the bottom of the filter plate 14 is provided with a filter, so that only the part of the sample whose diameter is smaller than the filter hole 141 can enter the bottom of the filter plate 14 after pretreatment, and the rest of the large particles are blocked above the filter plate 14. In order to limit the position of the filter plate 14 and prevent the filter plate 14 from being too close to the bottom or top of the sample storage cavity 111, a radially inwardly protruding limit step surface 1111 is provided on the inner wall of the sample storage cavity 111 near the bottom. , the diameter above and below the limiting step surface 1111 changes, and the lower diameter is smaller than the upper one, so the filter plate 14 matching the upper diameter is blocked by the limiting step surface 1111 and cannot move downward.

In addition, the bottom center of the filter plate 14 is also provided with a connecting rod 142 extending axially downwards and abutting the lower end on the top surface of the valve core 21. By setting the connecting rod 142, when the valve core 21 moves upward to the open position, the filter The plate 14 moves upward synchronously, so that a large amount of liquid in the sample storage chamber 111 flows downward into the valve core 21, while the large solid particles are further lifted to avoid downward movement.

Finally, this embodiment also provides a sample collection tube 30, as shown in Figure 7 and Figure 8, the sample collection tube 30 includes a collector 31 and a detachable lifting seat 32 arranged on the top of the collector 31, the collector 31 A sample collection cavity 311 is provided inside to collect the samples discharged from the sample collection tube 10 . The jacking seat 32 is fixed on the top of the collector 31 by threaded connection, the jacking seat 32 has a jacking wall 321 extending upwards, and the outer diameter of the jacking wall 321 is smaller than the inner diameter of the accommodating opening 116, so that the jacking wall 321 can stretch into the accommodating opening. In the port 116, an upward thrust is applied to the spool 21 from below. A sample collection port 322 communicating with the sample collection chamber 311 is formed on the top of the lifting wall 321 , and the sample discharged from the discharge hole 213 enters the sample collection chamber 311 through the sample collection port 322 .

Specifically, the collection process is shown in FIG. 8 , the jacking seat 32 is aligned with the bottom of the pipe body 11, and the jacking seat 32 is moved upwards, and the jacking wall 321 at the top of the jacking seat 32 pushes the valve core 21 to move upwards, so that When the valve core 21 moves to the open position, the sample in the sample storage chamber 111 passes down the valve core 21 and enters the sample collection chamber 311 through the sample collection port 322 to realize sample collection.

To sum up, the beneficial effect of the present invention is to realize the discharge of the sample by setting the valve core 21 that can be opened in one direction in the opening 113 at the bottom of the tube body 11, and by setting the first sealing ring 221 and the valve core 21 on the valve core 21 The second sealing ring 222 ensures that no matter whether the valve core 21 is in an open state or a closed state, the sample in the sample storage chamber 111 can be prevented from leaking outward.

The foregoing is a description of the embodiments of the present invention. Through the above description of the disclosed embodiments, those skilled in the art can implement or use the present invention. Various modifications to these examples will be apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel points disclosed herein.

Claims (10)

1. A sample collection tube, comprising a tube body (11) with a sample storage cavity (111) inside and an outlet (113) at the bottom that communicates with the sample storage cavity (111), characterized in that, The outlet (113) is provided with a spool (21), the side wall of the spool (21) is provided with a feed hole (212), the bottom is provided with a discharge hole (213), the spool (21) A sealing assembly that extends circumferentially around the valve core (21) and closely cooperates with the inner wall surface of the outlet (113) to form a sealing structure is fixedly arranged on the outer peripheral surface. The spool (21) moves axially within said outlet (113), thereby having an open position and a closed position, When the spool (21) is in the closed position, the feeding hole (212) faces the inner wall of the outlet (113), and the upper part of the feeding hole (212) is sealed by a sealing component, preventing the sample in the sample storage chamber (111) from Enter the discharge hole (213); When the spool (21) is in the open position, the feeding hole (212) is in the sample storage chamber (111), and the lower part of the feeding hole (212) is closed by a sealing assembly, preventing the sample in the sample storage chamber (111) from entering the valve. The gap between the side wall of the core (21) and the inner wall of the outlet (113). 2. The sample collection tube according to claim 1, characterized in that the sealing assembly comprises a first sealing ring (221) arranged above the feeding hole (212) and a second sealing ring (221) arranged below the feeding hole (212). Sealing ring (222), when the spool (21) is in the closed position, the outer circumference of the first sealing ring (221) is closely fitted on the inner wall of the outlet (113), thereby sealing the top of the feed hole (212); When the spool (21) is in the open position, the first sealing ring (221) is separated from the outlet (113), and the outer periphery of the second sealing ring (222) is tightly fitted on the inner wall of the outlet (113), so that The bottom of the feeding hole (212) is closed. 3. The sample collection tube according to claim 2, characterized in that, the outer diameters of the first sealing ring (221) and the second sealing ring (222) are larger than the inner diameter of the outlet (113), thereby forming a The outer peripheries of the first sealing ring (221) and the second sealing ring (222) are tightly fitted on the inner wall of the outlet (113). 4. The sample collection tube according to claim 2, characterized in that, above and below the feed hole (212) on the side wall of the spool (21), there are respectively provided with circumferentially extending, radially inwardly recessed and An annular first installation part (216) and a second installation part (217) are formed, the first sealing ring (221) is set in the first installation part (216), and the second sealing ring (222) Set in the second installation part (217). 5. The sample collection tube according to claim 2, characterized in that, the first sealing ring (221) and the second sealing ring (222) are integrated, and the first sealing ring (221) and the second sealing ring (222) ) is fixedly provided with a connecting part (223), and the connecting part (223) relatively fixes the distance between the first sealing ring (221) and the second sealing ring (222). 6. The sample collection tube according to claim 5, characterized in that, the connecting part (223) is connected between the first sealing ring (221) and the second sealing ring (222) around the circumferential direction, and the connecting part (223) A feed port (224) corresponding to the position of the feed hole (212) is formed on the top. 7. The sample collection tube according to claim 5, characterized in that, above and below the feed hole (212) on the side wall of the valve core (21), there are respectively provided with a circumferentially extending and radially outwardly protruding The first annular flange (2163) and the second annular flange (2172), the first annular area (2161) is formed above the first annular flange (2163) to limit the first sealing ring (221), Below the second annular flange (2172) is formed a second annular area (2171) where the second sealing ring (222) is limited, and the inner wall of the connecting part (223) is provided with the first annular flange (2163) and the second annular flange (2172) to adapt to the limit groove (2232). 8. The sample collection tube according to claim 1, characterized in that, the top of the valve core (21) is provided with a first stopper (214), and the first stopper (214) is located in the sample storage chamber (111) Inside, the top of the outlet (113) is provided with a second stopper (114), and in the radial direction of the outlet (113), the first stopper (214) and the second stopper (114) partially overlap, so that the second A stop structure is formed when the first stop part (214) and the second stop part (114) abut against each other; The bottom of the spool (21) is provided with a third stopper (215), the bottom of the outlet (113) is provided with a fourth stopper (115), and the fourth stopper (115) is located at the third stopper ( 215), and in the radial direction of the outlet (113), the third stopper (215) and the fourth stopper (115) partially overlap, so that the third stopper (215) and the fourth stopper (115) form a stopper structure when they abut against each other. 9. The sample collection tube according to claim 1, characterized in that, the outer periphery of the valve core (21) is provided with an elastic element (23), and the upper end of the elastic element (23) abuts against the inside of the tube body (11), and the elastic element (23) The lower end of the element (23) abuts on the spool (21), thereby exerting downward pressure on the spool (21), keeping the spool (21) in the closed position. 10. The sample collection tube according to claim 1, characterized in that, a sealing component for sealing the discharge hole (213) is arranged in the discharge hole (213); Preferably, the sample storage chamber (111) is provided with a filter plate (14) adapted to the inner diameter of the sample storage chamber (111), and the filter plate (14) is provided with several filter holes ( 141), the bottom of the filter plate (14) is provided with a filter screen, and the center of the bottom of the filter plate (14) is provided with a connecting rod (142) extending axially downward, and the lower end of the connecting rod (142) abuts against the valve core (21) on the top surface; Preferably, the sample storage cavity (111) is further provided with a limiting stepped surface (1111) protruding radially inward for limiting the filter plate (14).

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