Sampling device capable of automatically closing

Abstract

The invention discloses a sampling device capable of automatically closing, which relates to the field of sampling devices and comprises a sampling valve mounted on a medium pipeline. The sampling valve comprises a valve body shell fixedly installed outside the medium pipeline through a flange, a valve rod movably installed in the valve body shell and a sampling bottle connected and installed below the valve body shell through a sampling pipeline, a medium flow channel communicated with the sampling pipeline is formed in the valve body shell, and a control part is installed at one end of the valve body shell; the valve rod can move to a first position and a second position under the control of the control part, when the valve rod moves to the first position, the medium flow channel is communicated with the interior of the medium pipeline, and when the valve rod moves to the second position, the medium flow channel is separated from the interior of the medium pipeline. By arranging the sampling valve, when a pipeline needs to be sampled, sampling can be achieved only by directly controlling the valve rod to move through the control part, and operation is convenient and fast.

Description

Technical Field

[0001] The present invention relates to the field of sampling devices, in particular to a sampling device capable of automatic reclosing. Background Art

[0002] In many industrial fields such as petrochemicals, pharmaceuticals, food and beverages, and water treatment, regular sampling and analysis of flowing media (such as liquids, slurries, gases, etc.) in pipelines is a key link in ensuring product quality, monitoring process and safe operation.

[0003] At present, widely used sampling devices (such as sampling ports modified from plug valves, ball valves, and needle valves) generally require operators to manually perform complex switching operations (such as rotating the handle multiple times, removing the plug, connecting the hose, etc.) while meeting the basic sampling functions. The process is time-consuming and labor-intensive, and this operation method is inefficient in environments where frequent sampling is required or space is limited. It increases the labor intensity and time cost of workers and may even delay the sampling time due to inconvenient operation. At the same time, after the sampling is completed, the existing valves are highly dependent on the operator to manually close them. Once the operator neglects, forgets to close, or fails to close them properly, it is very easy to cause the sampling port to continue to leak, resulting in medium loss and environmental pollution. Summary of the Invention

[0004] (1) Purpose of the invention

[0005] In view of this, the purpose of the present invention is to propose a sampling device that can automatically return to the closed position. By setting up the sampling device, when sampling is required in the pipeline, sampling can be achieved by directly controlling the movement of the valve stem through the control unit, which is convenient and quick to operate.

[0006] (2) Technical solution

[0007] To achieve the above technical objectives, the present invention provides a sampling device capable of automatic reclosing, which includes a sampling valve installed on a medium pipeline for sampling the medium in the medium pipeline. The sampling valve includes:

[0008] The valve body shell is fixedly installed on the outside of the medium pipeline through a flange;

[0009] a valve stem movably mounted inside the valve body shell;

[0010] A sampling bottle is connected to the bottom of the valve body shell through a sampling pipeline;

[0011] In which, a medium flow channel connected to the sampling pipeline is provided inside the valve body shell, and a control part is installed at one end of the valve body shell. The valve stem can move to a first position and a second position under the control of the control part. When the valve stem moves to the first position, the medium flow channel is connected to the inside of the medium pipeline, so that the medium inside the medium pipeline can enter the sampling pipeline through the medium flow channel. When the valve stem moves to the second position, the medium flow channel is separated from the inside of the medium pipeline, so that the medium inside the medium pipeline cannot enter the medium flow channel.

[0012] As a further description of the above technical solution: the end of the valve stem away from the medium pipeline has a threaded section, a nut adapted to the threaded section is installed in the control part, and the nut is sleeved with the threaded section, a cavity is provided inside the valve body shell, a movable piece is installed on the valve stem at a position inside the cavity, and a spring is also provided inside the cavity, one end of the spring is located at the inner wall of the cavity, and the other end is located on the side of the movable piece, and the valve stem has a tendency to move from the first position to the second position due to the elastic force of the spring.

[0013] As a further description of the above technical solution: the inner wall of the valve body shell is provided with a limiting groove along the length direction, and the outer wall of the valve stem is provided with a limiting slider protruding outward at the position of the limiting groove, and the limiting slider is engaged in the limiting groove and can slide along the length direction of the limiting groove.

[0014] As a further description of the above technical solution: the front end of the valve stem adopts a reducing structure whose diameter gradually increases from one end close to the medium pipeline to the other end, and the medium flow channel adopts a reducing structure whose inner diameter gradually increases from one end close to the medium pipeline to the other end. One end of the valve body shell extends to the inner wall position of the medium pipeline. The front end of the valve stem can be moved to a second position flush with the inner wall of the medium pipeline, or the reducing structure at the front end of the valve stem moves to a first position where the medium flow channel is away from one end of the medium pipeline. When the valve stem moves to the second position, the front end outer wall of the valve stem is completely fitted with the inner wall of the medium flow channel, and the inside of the medium pipeline is separated from the medium flow channel. When the valve stem moves to the first position, the front end outer wall of the valve stem is separated from the inner wall of the medium flow channel to the maximum gap, so that the inside of the medium pipeline and the medium flow channel are connected.

[0015] As a further description of the above technical solution: a guide groove is provided above the front end of the valve stem along the longitudinal direction, a through hole is provided inside the guide groove at one end away from the medium pipeline, the through hole penetrates the valve stem in the radial direction of the valve stem, the medium flow channel is located below the valve stem, and the bottom of the through hole is connected to the medium flow channel;

[0016] When the valve stem moves to the first position, one end of the guide groove extends to the inside of the medium pipeline, and the medium inside the medium pipeline can enter the medium flow channel through the guide groove and the through hole, and then enter the sampling bottle through the sampling pipeline. When the valve stem moves to the second position, the guide groove completely enters the inside of the valve body shell, and at this time the inside of the medium pipeline is separated from the medium flow channel.

[0017] As a further description of the above technical solution: the valve body shell includes a sampling section, a sealing section and a control section in the horizontal direction, from one end close to the medium pipeline to the other end. The medium flow channel is arranged in the sampling section, the cavity is arranged in the control section, and an elastic sealing ring is embedded in the sealing section, and the sealing ring is sleeved on the valve stem.

[0018] As a further description of the above technical solution: a quick connector is provided at the bottom of the sampling pipeline, the sampling bottle is assembled below the quick connector by threaded engagement, and a cannula is provided at the end of the sampling pipeline, the bottom of the cannula extends into the sampling bottle.

[0019] As a further description of the above technical solution: the quick connector is also connected to an activated carbon absorption device through an exhaust pipe.

[0020] As a further description of the above technical solution: the sampling pipeline is also connected to a backwash pipe through a tee, and ball valves are installed on the backwash pipe and the sampling pipeline below the tee.

[0021] As a further description of the above technical solution: a fan-shaped opening is radially opened on the outside of the valve body shell, a shift rod is arranged in the fan-shaped opening, a sliding groove is opened on the surface of the valve stem at the fan-shaped opening along the length direction, a slider is slidably assembled in the sliding groove, and the bottom of the shift rod is connected to the slider.

[0022] In the above technical solution, the present invention provides a sampling device that can automatically return to close. The sampling device is applied to pipelines that need to regularly detect and analyze the flowing medium inside the pipeline. By setting the sampling valve, when sampling is required, sampling can be achieved by directly controlling the movement of the valve stem through the control unit. The operation is convenient and quick. Moreover, through the structural design of the sampling valve, the valve stem of the sampling valve can be automatically reset after the sampling is completed, so that the sampling valve can achieve the effect of automatic return to close, avoiding the occurrence of medium leakage. In addition, the device has a high sampling efficiency and high speed when sampling through the structural design of the entire valve body. Moreover, by setting the backwash pipeline, the inside of the medium flow channel can be backwashed after the sampling is completed, avoiding the occurrence of medium deposition in the medium flow channel, resulting in scaling, and affecting subsequent sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0024] Figure 1 This is a schematic diagram of the overall structure of a sampling device capable of automatic reclosing provided in Example 1 of the present invention;

[0025] Figure 2 This is a front view of a sampling device capable of automatically reclosing provided in Example 1 of the present invention;

[0026] Figure 3 A side view of a sampling device capable of automatic reclosing provided in Example 1 of the present invention;

[0027] Figure 4 A sampling device capable of automatically returning to the original state provided in Example 1 of the present invention Figure 3 Middle AA section;

[0028] Figure 5 A partial cross-sectional view of a valve body housing in a sampling device capable of automatically returning to its original position provided in Example 1 of the present invention;

[0029] Figure 6 This is a schematic diagram of the overall structure of a sampling device capable of automatic reclosing provided in Example 2 of the present invention;

[0030] Figure 7 This is an overall cross-sectional view of a sampling device capable of automatic reclosing provided in Example 2 of the present invention;

[0031] Figure 8 This is a schematic diagram of the valve stem structure of a sampling device capable of automatically returning to its original position provided in Example 2 of the present invention;

[0032] Figure 9 This is a schematic diagram of the installation structure of a lever in a sampling device capable of automatically reclosing provided in Example 2 of the present invention.

[0033] Description of the drawings: 1. Sampling valve; 10. Valve body shell; 100. Sampling section; 1000. Medium flow channel; 101. Sealing section; 1010. Sealing ring; 1011. Limiting slide; 1012. Fan-shaped mouth; 102. Control section; 1020. Spring; 11. Flange; 12. Control part; 13. Valve stem; 130. Threaded section; 131. Movable sheet; 132. Guide groove; 133. Through hole; 134. Slide; 135. Limiting slider; 14. Push rod; 140. Slider; 2. Medium pipeline; 3. Sampling pipeline; 30. Ball valve; 31. Quick connector; 32. Backwash pipe; 33. Tee; 34. Cannula; 4. Sampling bottle; 5. Activated carbon absorption device; 50. Exhaust pipe. DETAILED DESCRIPTION

[0034] The following description is merely illustrative in nature and is not intended to limit the present disclosure, its applications, or uses. It should be understood that throughout the drawings, identical or similar reference numerals indicate identical or similar parts and features. The drawings merely schematically illustrate the concepts and principles of the embodiments of the present disclosure and do not necessarily depict the specific dimensions and proportions of the various embodiments of the present disclosure. Certain portions of certain drawings may be exaggerated to illustrate relevant details or structures of the embodiments of the present disclosure.

[0035] Example 1

[0036] like Figure 1 - Figure 5 As shown: This embodiment provides a technical solution: a sampling device capable of automatic return closing, including a sampling valve 1, the sampling valve 1 is installed on the medium pipeline 2, and is used to sample the medium in the medium pipeline 2. The sampling valve 1 includes: a valve body shell 10 fixedly installed on the outside of the medium pipeline 2 through a flange 11, a valve stem 13 movably installed inside the valve body shell 10, and a sampling bottle 4 installed below the valve body shell 10 connected to the sampling pipeline 3, wherein the valve body shell 10 is provided with a medium flow channel communicating with the sampling pipeline 3. 1000. A control unit 12 is installed at one end of the valve body housing 10. The valve stem 13 can move to a first position and a second position under the control of the control unit 12. When the valve stem 13 moves to the first position, the medium flow channel 1000 is connected to the inside of the medium pipeline 2, so that the medium inside the medium pipeline 2 can enter the sampling pipeline 3 through the medium flow channel 1000. When the valve stem 13 moves to the second position, the medium flow channel 1000 is separated from the inside of the medium pipeline 2, so that the medium inside the medium pipeline 2 cannot enter the medium flow channel 1000.

[0037] Working principle: This device is used to sample media from a fluid pipeline. During the non-sampling period, the sampling valve 1 is in a closed state. At this time, the valve stem 13 is in the second position, and the medium flow channel 1000 inside the valve body housing 10 is separated from the inside of the medium pipeline 2, so that the medium inside the medium pipeline 2 cannot enter the medium flow channel 1000. When sampling is required through the sampling valve 1, the control unit 12 controls the valve stem 13 to move to the first position. At this time, the medium flow channel 1000 is connected to the inside of the medium pipeline 2, and the medium inside the medium pipeline 2 enters the sampling pipeline 3 through the medium flow channel 1000, and then enters the sampling bottle 4, thus completing the sampling. The operation is convenient.

[0038] In summary, the device is mainly used for pipelines that require regular inspection and analysis of the flowing medium inside the pipeline. By setting up the device, when sampling is required, it is only necessary to directly control the movement of the valve stem 13 through the control unit 12, which is convenient and quick to operate.

[0039] Specifically, such as Figure 1 - Figure 5 As shown, in order to achieve automatic return of the sampling valve 1, in this embodiment, the end of the valve stem 13 away from the medium pipeline 2 has a threaded section 130, and a nut adapted to the threaded section 130 is installed in the control part 12, and the nut is sleeved with the threaded section 130. Therefore, when the control part 12 is rotated, the valve stem 13 can move along the length direction to achieve movement control of the valve stem 13. A cavity is provided inside the valve body shell 10, and a movable piece 131 is installed on the valve stem 13 at a position inside the cavity. A spring 1020 is also provided inside the cavity, and one end of the spring 1020 is located on the inner wall of the cavity, and the other end is located on the side of the movable piece 131. The elastic force of the spring 1020 makes the valve stem 1 have a movement tendency to move from the first position to the second position. Through this movement tendency, when the valve stem 13 is not subjected to other external forces, the valve stem 13 can be pushed to move until the sampling valve 1 is closed, thereby achieving automatic return of the sampling valve 1.

[0040] Specifically, such as Figure 1 - Figure 5 As shown, in order to ensure that the valve stem 13 does not rotate during movement control, in this embodiment, a limiting groove 1011 is provided on the inner wall of the valve body shell 10 along the length direction, and a limiting slider 135 protruding outward is provided on the outer wall of the valve stem 13 at the position of the limiting groove 1011. The limiting slider 135 is engaged in the limiting groove 1011 and can slide along the length direction of the limiting groove 1011. Based on this, when the control part 12 is rotating, due to the limiting effect of the limiting slider 135, the valve stem 13 cannot rotate. Therefore, under the cooperation of the nut and the threaded section 130, the valve stem 13 moves along the length direction of the valve body shell 10, thereby realizing the movement control of the valve stem 13.

[0041] Specifically, such as Figure 1 - Figure 5As shown, in order to realize the control of sampling by the valve stem 13, in this embodiment, the front end of the valve stem 13 adopts a reducing structure in which the diameter gradually increases from one end close to the medium pipeline 2 to the other end, and the medium flow channel 1000 adopts a reducing structure in which the inner diameter gradually increases from one end close to the medium pipeline 2 to the other end. One end of the valve body shell 10 extends to the inner wall position of the medium pipeline 2. The front end of the valve stem 13 can be moved to a second position flush with the inner wall of the medium pipeline 2, or the reducing structure at the front end of the valve stem 13 moves to a first position in which the medium flow channel 1000 is away from one end of the medium pipeline 2. When the valve stem 13 moves to the second position, the front end outer wall of the valve stem 13 is completely in contact with the inner wall of the medium flow channel 1000, and the interior of the medium pipeline 2 is separated from the medium flow channel 1000. When the valve stem 13 moves to the first position, the front end outer wall of the valve stem 13 is separated from the inner wall of the medium flow channel 1000 to the maximum gap, so that the interior of the medium pipeline 2 is connected to the medium flow channel 1000.

[0042] Based on this, when the rotating control part 12 moves the valve stem 13 outward, even if the valve stem 13 gradually moves from the second position to the first position, the sampling valve 1 gradually opens. At this time, the medium inside the medium pipeline 2 enters the sampling pipeline 3 through the medium flow channel 1000, and then enters the sampling bottle 4 from the sampling pipeline 3 to realize the sampling process. When the sampling is completed, the control part 12 is released. At this time, under the elastic force of the spring 1020, the valve stem 13 moves from the first position to the second position until it moves to the second position. At this time, the sampling valve 1 is closed, realizing the effect of automatic return.

[0043] Example 2

[0044] like Figure 1 - Figure 9 As shown: This embodiment provides a technical solution: a sampling device capable of automatic return closing, including a sampling valve 1, the sampling valve 1 is installed on the medium pipeline 2, and is used to sample the medium in the medium pipeline 2. The sampling valve 1 includes: a valve body shell 10 fixedly installed on the outside of the medium pipeline 2 through a flange 11, a valve stem 13 movably installed inside the valve body shell 10, and a sampling bottle 4 installed below the valve body shell 10 connected to the sampling pipeline 3, wherein the valve body shell 10 is provided with a medium flow channel communicating with the sampling pipeline 3. 1000. A control unit 12 is installed at one end of the valve body housing 10. The valve stem 13 can move to a first position and a second position under the control of the control unit 12. When the valve stem 13 moves to the first position, the medium flow channel 1000 is connected to the inside of the medium pipeline 2, so that the medium inside the medium pipeline 2 can enter the sampling pipeline 3 through the medium flow channel 1000. When the valve stem 13 moves to the second position, the medium flow channel 1000 is separated from the inside of the medium pipeline 2, so that the medium inside the medium pipeline 2 cannot enter the medium flow channel 1000.

[0045] Specifically, such as Figure 1 - Figure 9 As shown in the figure, in order to realize the automatic closing of the sampling valve 1, in this embodiment, the end of the valve stem 13 away from the medium pipeline 2 has a threaded segment 130, and the control part 12 is provided with a nut matched with the threaded segment 130, and the nut is sleeved with the threaded segment 130, so that when the control part 12 is rotated, the valve stem 13 can move along the length direction, realizing the movement control of the valve stem 13. The inside of the valve body shell 10 is provided with a cavity, and the movable piece 131 is installed on the valve stem 13 at the position inside the cavity. The spring 1020 is also arranged inside the cavity, one end of the spring 1020 is abutted against the inner wall of the cavity, and the other end is abutted against the side surface of the movable piece 131. The valve stem 1 has a movement trend from the first position to the second position by the elastic force of the spring 1020. Through the movement trend, the valve stem 1 can be pushed to move when the valve stem 13 is not subjected to other external forces, until the sampling valve 13 is closed, that is, the automatic closing of the sampling valve 1 is realized.

[0046] Specifically, as shown in the figure, Figure 6 - Figure 9 As shown in the figure, in order to control the sampling of the valve stem 13, in this embodiment, the guide groove 132 is arranged on the valve stem 13 at the position above the front end and along the length direction. The through hole 133 is arranged in the end of the guide groove 132 away from the medium pipeline 2, and the through hole 133 penetrates the valve stem 13 along the radial direction of the valve stem 13. The medium flow channel 1000 is arranged below the valve stem 13, and the bottom of the through hole 133 is communicated with the medium flow channel 1000.

[0047] When the valve stem 13 moves to the first position, one end of the guide groove 132 extends into the medium pipeline 2, and the medium in the medium pipeline 2 can enter the medium flow channel 1000 through the guide groove 132 and the through hole 133, and then enter the sampling bottle 4 through the sampling pipeline 3, so that the sampling can be completed. When the valve stem 13 moves to the second position, the guide groove 132 completely enters the inside of the valve body shell 10, at this time, the inside of the medium pipeline 2 is separated from the medium flow channel 1000, and the sampling valve 1 is in the closed state. By arranging the guide groove 132 above the valve stem 13, the medium in the medium pipeline 2 can directly flow into the guide groove 132, so that the sampling speed and efficiency are improved.

[0048] Specifically, as shown in the figure, Figure 1 - Figure 9As shown, in order to prevent medium deposition in the medium flow channel 1000, resulting in scaling and affecting subsequent sampling, in this embodiment, the sampling pipeline 3 is also connected to a backwash pipe 32 through a tee 33, and a ball valve 30 is installed on the backwash pipe 32 and on the sampling pipeline 3 below the tee 33. Based on this, when sampling, the ball valve 30 on the backwash pipe 32 is closed, and the medium can directly enter the sampling bottle 4. After the sampling is completed, the external backwash equipment can be connected through the backwash pipe 32, and then the ball valve 30 on the sampling pipeline 3 is closed, and the ball valve 30 on the backwash pipe 32 is opened. The medium is reversely injected into the tee 33 through the backwash equipment, so that the deposited medium in the medium flow channel 1000 can be backwashed into the medium pipeline 2, thereby achieving the backwash effect. It should also be noted that the backwash equipment can be an external pump.

[0049] Specifically, such as Figure 6 - Figure 9 As shown, since the guide groove 132 is opened above the valve stem 13, it is easy to cause the medium to flow back during backwashing, affecting the backwashing effect. In this embodiment, the outer side of the valve body shell 10 is radially provided with a fan-shaped opening 1012, and a lever 14 is provided in the fan-shaped opening 1012. The surface of the valve stem 13 is located at the fan-shaped opening 1012 and is provided with a slide groove 134 along the length direction. A slider 140 is slidably assembled in the slide groove 134, and the bottom of the lever 14 is connected to the slider 140. Such a structural arrangement makes it possible to control the rotation of the valve stem 13 by the lever 14 during sampling, so that the guide groove 132 is in the direction facing the medium flow. The direction of movement is convenient for quick sampling. When the sampling is completed and the medium flow channel 1000 needs to be backwashed, the valve stem 13 can be controlled to rotate by the lever 14 so that the guide groove 132 is in the direction of facing the medium flow, so that the medium will not flow back, thereby ensuring efficient sampling and smooth backwashing. It should also be noted that the valve stem 13 can be controlled to rotate and fix by the lever 14, and the lever 14 and the valve stem 13 are connected by a sliding connection. Therefore, the setting of the lever 14 does not affect the horizontal movement of the valve stem 13, that is, it does not affect the movement of the valve stem 13 between the first position and the second position.

[0050] In addition, based on Example 1 and Example 2, Figure 1 - Figure 9 As shown, in order to ensure that the medium does not leak along the valve stem 13 during sampling, in this embodiment, the valve body shell 10 includes a sampling section 100, a sealing section 101 and a control section 102 in the horizontal direction from one end close to the medium pipeline 2 to the other end. The medium flow channel 1000 is arranged in the sampling section 100, the cavity is arranged in the control section 102, and an elastic sealing ring 1010 is embedded in the sealing section 101. The sealing ring 1010 is sleeved on the valve stem 13. The setting of the sealing ring 1010 can prevent the medium from leaking along the valve stem 13.

[0051] Specifically, such as Figure 1 - Figure 9 As shown, in order to facilitate sampling, in this embodiment, a quick connector 31 is provided at the bottom of the sampling pipeline 3, and the sampling bottle 4 is assembled under the quick connector 31 by screwing. In addition, a cannula 34 is provided at the end of the sampling pipeline 3, and the bottom of the cannula 34 extends into the sampling bottle 4. Such a structural arrangement makes it possible to disassemble the sampling bottle 4 by simply rotating the sampling bottle 4, which is easy to operate.

[0052] Specifically, such as Figure 1 - Figure 9 As shown, in order to ensure that the medium can enter the sampling bottle 4, the sampling bottle 4 needs to be connected to the outside world to balance the air pressure. Therefore, the sampling bottle 4 needs to be exhausted when sampling. In order to avoid pollution caused by exhaust, in this embodiment, the quick connector 31 is also connected to the activated carbon absorption device 5 through the exhaust pipe 50. Based on this, when the sampling bottle 4 is sampling, the gas inside the sampling bottle 4 can enter the activated carbon absorption device 5 through the exhaust pipe 50, and be discharged after being adsorbed and purified by the activated carbon absorption device 5, thereby achieving the effect of avoiding pollution.

[0053] The exemplary implementation schemes proposed in the present disclosure are described in detail above with reference to preferred embodiments. However, it will be understood by those skilled in the art that, without departing from the concept of the present disclosure, various modifications and variations can be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present disclosure can be combined in various ways without exceeding the scope of protection of the present disclosure, which is determined by the appended claims.

Claims

1. A sampling device capable of automatically returning to the closed position, comprising a sampling valve (1), wherein the sampling valve (1) is installed on a medium pipeline (2) and is used to sample a medium in the medium pipeline (2), and is characterized in that: The sampling valve (1) comprises: A valve body housing (10) is fixedly mounted on the outside of the medium pipeline (2) via a flange (11); a valve stem (13) movably mounted inside the valve body housing (10); A sampling bottle (4) installed below the valve body housing (10) is connected via a sampling line (3); A medium flow channel (1000) communicating with the sampling pipeline (3) is provided inside the valve body shell (10), a control unit (12) is installed at one end of the valve body shell (10), and the valve stem (13) can be moved to a first position and a second position under the control of the control unit (12). When the valve stem (13) moves to the first position, the medium flow channel (1000) is communicated with the inside of the medium pipeline (2), so that the medium inside the medium pipeline (2) can enter the sampling pipeline (3) through the medium flow channel (1000). When the valve stem (13) moves to the second position, the medium flow channel (1000) is separated from the inside of the medium pipeline (2), so that the medium inside the medium pipeline (2) cannot enter the medium flow channel (1000).

2. The sampling device capable of automatic reclosing according to claim 1, characterized in that: The end of the valve stem (13) away from the medium pipeline (2) has a threaded section (130), a nut adapted to the threaded section (130) is installed in the control part (12), and the nut is sleeved with the threaded section (130), a cavity is provided inside the valve body shell (10), a movable piece (131) is installed on the valve stem (13) at a position inside the cavity, and a spring (1020) is also provided inside the cavity, one end of the spring (1020) is located at the inner wall of the cavity, and the other end is located at the side of the movable piece (131), and the valve stem (1) has a tendency to move from the first position to the second position due to the elastic force of the spring (1020).

3. The sampling device capable of automatic reclosing according to claim 2, characterized in that: The inner wall of the valve body shell (10) is provided with a limiting groove (1011) along the length direction, and the outer wall of the valve stem (13) is provided with a limiting slider (135) protruding outward at the position of the limiting groove (1011). The limiting slider (135) is engaged in the limiting groove (1011) and can slide along the length direction of the limiting groove (1011).

4. The sampling device capable of automatic reclosing according to claim 3, characterized in that: The front end of the valve stem (13) adopts a variable diameter structure in which the diameter gradually increases from one end close to the medium pipeline (2) to the other end, and the medium flow channel (1000) adopts a variable diameter structure in which the inner diameter gradually increases from one end close to the medium pipeline (2) to the other end. One end of the valve body shell (10) extends to the inner wall position of the medium pipeline (2), and the front end of the valve stem (13) can be moved to a second position flush with the inner wall of the medium pipeline (2), or the variable diameter structure of the front end of the valve stem (13) moves to the medium pipeline (2). The medium flow channel (1000) is at a first position away from one end of the medium pipeline (2). When the valve stem (13) moves to the second position, the front end outer wall of the valve stem (13) is completely in contact with the inner wall of the medium flow channel (1000), and the interior of the medium pipeline (2) is separated from the medium flow channel (1000). When the valve stem (13) moves to the first position, the front end outer wall of the valve stem (13) is separated from the inner wall of the medium flow channel (1000) to a maximum gap, so that the interior of the medium pipeline (2) and the medium flow channel (1000) are connected.

5. The sampling device capable of automatic reclosing according to claim 2, characterized in that: A guide groove (132) is provided above the front end of the valve stem (13) along the longitudinal direction, a through hole (133) is provided inside the guide groove (132) at one end away from the medium pipeline (2), the through hole (133) penetrates the valve stem (13) in the radial direction of the valve stem (13), the medium flow channel (1000) is located below the valve stem (13), and the bottom of the through hole (133) is communicated with the medium flow channel (1000); When the valve stem (13) moves to the first position, one end of the guide groove (132) extends to the inside of the medium pipeline (2), and the medium inside the medium pipeline (2) can enter the medium flow channel (1000) through the guide groove (132) and the through hole (133), and then enter the sampling bottle (4) through the sampling pipeline (3). When the valve stem (13) moves to the second position, the guide groove (132) completely enters the inside of the valve body shell (10), and at this time, the inside of the medium pipeline (2) is separated from the medium flow channel (1000).

6. The sampling device capable of automatic reclosing according to any one of claims 2 to 5, characterized in that: The valve body shell (10) includes a sampling section (100), a sealing section (101) and a control section (102) in sequence from one end close to the medium pipeline (2) to the other end in the horizontal direction. The medium flow channel (1000) is arranged in the sampling section (100), the cavity is arranged in the control section (102), and an elastic sealing ring (1010) is embedded in the sealing section (101), and the sealing ring (1010) is sleeved on the valve stem (13).

7. The sampling device capable of automatic reclosing according to any one of claims 2 to 5, characterized in that: A quick connector (31) is provided at the bottom of the sampling pipeline (3), and the sampling bottle (4) is assembled below the quick connector (31) by screwing. A cannula (34) is provided at the end of the sampling pipeline (3), and the bottom of the cannula (34) extends into the sampling bottle (4).

8. The sampling device capable of automatic reclosing according to claim 7, characterized in that: The quick connector (31) is also connected to an activated carbon absorption device (5) via an exhaust pipe (50).

9. The sampling device capable of automatic reclosing according to claim 5, characterized in that: The sampling pipeline (3) is also connected to a backwash pipe (32) via a tee (33), and a ball valve (30) is installed on the backwash pipe (32) and on the sampling pipeline (3) below the tee (33).

10. The sampling device capable of automatic reclosing according to claim 9, characterized in that: The valve body shell (10) is provided with a fan-shaped opening (1012) in the radial direction on the outside, and a shift rod (14) is provided in the fan-shaped opening (1012). A sliding groove (134) is provided on the surface of the valve stem (13) at the fan-shaped opening (1012) along the length direction, and a slider (140) is slidably mounted in the sliding groove (134). The bottom of the shift rod (14) is connected to the slider (140).

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