Negative pressure expansion ring and in-situ water absorption device

Abstract

The present application relates to the technical fields of surface water and gravity exchange belt sampling, and particularly relates to a negative pressure expansion ring and an in-situ water suction device, which comprises a mounting assembly, a sealing ring arranged in the inside of a fixed ring, a stop ring arranged on the sidewall of the fixed ring, an expansion assembly and a sealing assembly; the expansion assembly comprises a moving column slidingly arranged in the inside of the sealing ring, a mounting ring slidingly connected with the inside of the fixed ring and arranged at the bottom of the moving column; the sealing assembly comprises a mounting groove arranged in the inside of the mounting ring, a moving rod elastically arranged in the inside of the mounting groove, a fixed plate arranged at one end of the moving rod and a sealing plate arranged at the other end of the moving rod. The negative pressure expansion ring and the in-situ water suction device can eliminate the gap between the pipe wall and the exchange belt by expansion of the stop ring during sampling, so as to avoid the upper surface water from entering the sampling area along the gap between the pipe wall and the exchange belt.

Description

Technical Field

[0001] This invention relates to the technical field of sampling surface water and gravity exchange zones, and particularly to a negative pressure expansion ring and an in-situ water absorption device. Background Technology

[0002] The surface water and gravity exchange zone, also known as the "hyporheic zone," is a hot topic in geological research. However, it is very difficult to directly extract in-situ current-disturbed sediments tens of centimeters below the riverbed. When existing sampling probes are inserted into the hyporheic zone, surface water from above will "cross-layer" into the sampling area along the gap between the probe wall and the hyporheic zone, resulting in poor water sample completeness and spatial positioning accuracy in practical micro-studies of hyporheic zone chemistry. Summary of the Invention

[0003] In view of the problem of spatial positioning accuracy in the existing interactive band sampling, the present invention is proposed.

[0004] Therefore, one objective of this invention is to provide a negative pressure expansion ring that expands during sampling to eliminate the gap between the tube wall and the interfacial zone.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a negative pressure expansion ring, comprising, The mounting assembly includes a fixing ring and a water-stop ring disposed on the side wall of the fixing ring. The fixing ring has a connecting hole communicating with the water-stop ring, and a sealing ring disposed inside the fixing ring. The expansion assembly includes a movable column slidably disposed inside the sealing ring, an installation ring disposed at the bottom of the movable column and slidably connected to the inside of the fixing ring, and a first channel disposed in the movable column and the installation ring. A gas storage cavity is formed between the movable column, the installation ring, the fixing ring, and the sealing ring, and the connecting hole communicates with the gas storage cavity. The sealing assembly includes an installation groove disposed inside the installation ring, a movable rod elastically disposed inside the installation groove, a fixing plate disposed at one end of the movable rod, and a sealing plate disposed at the other end of the movable rod. The fixing plate cooperates with the connecting hole, and the sealing plate isolates the first channel. After the installation ring moves along the fixing ring to inject gas from the gas storage cavity into the water-stop ring, the fixing plate overlaps with the connecting hole and is inserted. At this time, the sealing plate moves to open the first channel.

[0006] As a preferred embodiment of the negative pressure expansion ring of the present invention, the fixed ring is provided with a guide post on its inner side, and the top of the movable post is provided with a limiting ring that is slidably connected to the guide post; the guide post and the connecting hole are respectively located on both sides of the sealing ring.

[0007] As a preferred embodiment of the negative pressure expansion ring and in-situ water absorption device of the present invention, the mounting groove includes a circular groove and a square groove, the fixing plate is located in the circular groove, and the sealing plate is located in the square groove.

[0008] In a preferred embodiment of the negative pressure expansion ring of the present invention, a guide ring is provided in the circular groove, the moving rod is slidably inserted in the guide ring, and an elastic element is provided between the guide ring and the fixed plate.

[0009] As a preferred embodiment of the negative pressure expansion ring of the present invention, the bottom of both the circular groove and the square groove are provided with vent holes that communicate with the interior of the fixed ring.

[0010] As a preferred embodiment of the negative pressure expansion ring of the present invention, the mounting groove is provided in multiple ways, and multiple sealing plates are inserted into the first channel with their ends contacting each other to isolate the first channel; the connecting hole is provided in multiple ways, and each fixing plate is inserted into one of the connecting holes respectively.

[0011] The beneficial effects of this negative pressure expansion ring are: air in the air storage chamber can enter the water-stop ring, causing the water-stop ring to expand. During sampling, the expansion of the water-stop ring can eliminate the gap between the pipe wall and the interaction zone, preventing surface water from "crossing over" into the sampling area along the gap between the pipe wall and the interaction zone.

[0012] Another objective of this invention is to provide an in-situ water absorption device that can expand the water-stop ring during sampling to eliminate the gap between the pipe wall and the interaction zone.

[0013] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an in-situ water absorption device, including a negative pressure expansion ring, and further including a sampling component, including a sampling tube disposed on the outside of the fixed ring, a sampling tip disposed on the bottom of the sampling tube, and a sampling hole disposed in the sampling tip, wherein a water-stop ring is disposed on the outside of the sampling tube and communicates with the air storage chamber; and a filter component, disposed inside the sampling tube and located between the first channel and the sampling tip.

[0014] In a preferred embodiment of the in-situ water absorption device of the present invention, the sampling tube includes a first pipe and a second pipe, the fixing ring is connected to the first pipe and the second pipe respectively, and the sampling tip is located at the bottom of the second pipe; the water-stopping ring is disposed between the first pipe and the second pipe.

[0015] As a preferred embodiment of the in-situ water absorption device of the present invention, wherein: the sampling holes are provided with a plurality of holes disposed on the sidewall of the sampling tip.

[0016] As a preferred embodiment of the in-situ water absorption device of the present invention, the filtration assembly includes a plurality of filter screens, and the pore size of the plurality of filter screens decreases sequentially along the direction of the sampling tip and the first channel.

[0017] The beneficial effects of this negative in-situ water absorption device are as follows: During sampling, the sampling component is inserted into the inter-zone, and the air in the air storage chamber is controlled to enter the water-stop ring, causing the water-stop ring to expand and contact the inter-zone, eliminating the gap between the pipe wall and the inter-zone, and preventing surface water from "crossing over" into the sampling area along the gap between the pipe wall and the inter-zone. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 An overall schematic diagram of Embodiment 1 is shown; Figure 2 A schematic diagram of the guide post of Embodiment 2 is shown; Figure 3 A schematic diagram of the enclosed component of Embodiment 3 is shown; Figure 4 An overall schematic diagram of Embodiment 4 is shown; Figure 5 A schematic diagram of the sampling tube for Example 4 is shown. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0021] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0022] Example 1, referring to Figure 1 The first embodiment of the present invention provides a negative pressure expansion ring, which includes an installation component 100, an expansion component 200, and a sealing component 300.

[0023] The mounting assembly 100 includes a fixing ring 101 and a water-stop ring 102 disposed on the side wall of the fixing ring 101. The fixing ring 101 is provided with a connecting hole 103 communicating with the water-stop ring 102, and a sealing ring 104 disposed inside the fixing ring 101. The water-stop ring 102 communicates with the inside of the fixing ring 101 through the connecting hole 103.

[0024] The expansion assembly 200 includes a movable column 201 slidably disposed inside the sealing ring 104, a mounting ring 202 disposed at the bottom of the movable column 201 and slidably connected to the inside of the fixed ring 101, and a first channel S disposed in the movable column 201 and the mounting ring 202, wherein the first channel S connects the two ends of the fixed ring 101, so that the two ends of the fixed ring 101 can flow.

[0025] The moving column 201, mounting ring 202, fixing ring 101, and sealing ring 104 form an air storage chamber M. The connecting hole 103 communicates with the air storage chamber M. The moving column 201 and the sealing ring 104 are sealed by a sealing ring, which is located inside the sealing ring 104. The mounting ring 202 and the fixing inner wall are sealed by a rubber layer, which is located outside the mounting ring 202. Air inside the air storage chamber M can enter the water-stop ring 102 through the connecting hole 103, causing the water-stop ring 102 to expand. The water-stop ring 102 can be made of rubber material with good ductility.

[0026] The sealing assembly 300 includes a mounting groove 301 disposed inside the mounting ring 202, a movable rod 302 elastically disposed inside the mounting groove 301, a spring installed between the movable rod 302 and the inner wall of the mounting groove 301, the spring causing the movable rod 302 to be elastically mounted in the mounting groove 301, a fixing plate 303 disposed at one end of the movable rod 302, and a sealing plate 304 disposed at the other end of the movable rod 302. The fixing plate 303 cooperates with the connecting hole 103, and the sealing plate 304 isolates the first channel S. The fixing plate 303 and the connecting hole 103 are sealed together by a sealing ring. A sealing ring is provided on the outer side of the fixing plate 303. The sealing plate 304 is sealed to the inner wall of the mounting groove 301 and the inner wall of the first channel S. A rubber layer is provided on the outer side of the sealing plate 304.

[0027] In the initial state, the water-stop ring 102 is in a contracted state, the space of the air storage chamber M is in the maximum state, the mounting ring 202 is in contact with the inner wall of the fixing ring 101, at this time the fixing plate 303 is located in the mounting groove 301 and abuts against the inner wall of the fixing ring 101 under the elastic force of the spring, and at the same time the sealing plate 304 is inserted into the first channel S and contacts the inner wall of the first channel S, blocking the first channel S. At this time, the two ends of the fixing ring 101 cannot flow.

[0028] An air pump is installed at the top of the fixed ring 101. The air pump evacuates the fixed ring 101, making the top of the fixed ring 101 negative pressure. At this time, the moving column 201 can move up and down under the action of pressure difference. The mounting ring 202 moves along the fixed ring 101 and injects the gas inside the air storage chamber M into the water-stop ring 102, causing the water-stop ring 102 to expand. When the mounting ring 202 moves to the sealing ring 104, the fixing plate 303 can coincide with the connecting hole 103. At this time, under the elastic force of the spring, the fixing plate 303 is inserted into the connecting hole 103, and the sealing plate 304 will move together to open the first channel S. At this time, the two ends of the fixed ring 101 can flow. The fixing plate 303 and the connecting hole 103 are sealed by a sealing ring.

[0029] When it is necessary to return to the initial state, simply inject air into the fixed ring 101 using an air pump, so that the top of the fixed ring 101 is under positive pressure. At the same time, press the water-stop ring 102 in a ring shape, so that the air pressure inside the water-stop ring 102 increases, and the fixed plate 303 is squeezed back into the mounting groove 301. After the fixed plate 303 is retracted into the mounting groove 301, the end of the positively pressurized fixed ring 101 will squeeze the moving column 201 downward, so that the fixed plate 303 is misaligned with the connecting hole 103. Under the pressure of the water-stop ring 102, the air inside the water-stop ring 102 returns to the air storage chamber M, and the mounting ring 202 will return to the initial state.

[0030] Example 2, refer to Figure 2 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that: a guide post 105 is provided on the inner side of the fixed ring 101, and a limiting ring 203 is provided on the top of the movable post 201 and slidably connected to the guide post 105; the guide post 105 and the connecting hole 103 are respectively located on both sides of the sealing ring 104.

[0031] There is a gap between the limiting ring 203 and the guide post 105. At the same time, the limiting ring 203 and the sealing ring 104 can contact each other to achieve the limiting function, which can prevent the moving post 201 from moving and separating from the sealing ring 104 when the top of the fixed ring 101 is under positive pressure.

[0032] Meanwhile, the limiting ring 203 and the guide post 105 work together to restrict the sliding of the moving post 201 along the direction of the guide post 105, ensuring that the moving post 201 will not rotate during movement and that the fixing ring 101 can coincide with the connecting hole 103.

[0033] The remaining structure is the same as that in Example 1.

[0034] Example 3, referring to Figure 3This is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that the mounting groove 301 includes a circular groove 301a and a square groove 301b. The fixing plate 303 is located in the circular groove 301a, and the sealing plate 304 is located in the square groove 301b. The sealing plate 304 is sealed to the inner wall of the square groove 301b.

[0035] A guide ring 305 is provided in the circular groove 301a, and the moving rod 302 is slidably inserted in the guide ring 305. An elastic element 307 is provided between the guide ring 305 and the fixed plate 303, wherein the elastic element 307 is made of a spring or a metal sheet. Furthermore, the bottom of both the circular groove 301a and the square groove 301b is provided with a vent hole 301c that communicates with the inside of the fixed ring 101. The presence of the vent hole 301c makes the air pressure inside the circular groove 301a and the square groove 301b stable, ensuring that the fixed ring 101 and the sealing plate 304 slide smoothly.

[0036] Furthermore, the mounting groove 301 is provided with multiple sealing plates 304, which are inserted into the first channel S and whose ends contact each other to isolate the first channel S; the connecting hole 103 is provided with multiple holes, and each fixing plate 303 is inserted into one of the connecting holes 103 respectively, wherein the ends of the multiple sealing plates 304 can contact and seal, and the multiple sealing plates 304 together isolate the first channel S.

[0037] With multiple sealing plates 304 in place, when the fixing plate 303 is inserted into the connecting hole 103, the multiple sealing plates 304 slide simultaneously, increasing the flow cross-section of the first channel S that can be opened.

[0038] The remaining structure is the same as that in Example 2.

[0039] Example 4, refer to Figure 4 and Figure 5 This is the fourth embodiment of the present invention. This embodiment provides an in-situ water absorption device, including a negative pressure expansion ring, a sampling component 400, and a filter component 500.

[0040] The sampling assembly 400 includes a sampling tube 401 disposed on the outside of the fixing ring 101, a sampling tip 402 disposed at the bottom of the sampling tube 401, and a sampling hole 403 disposed in the sampling tip 402. The water-stop ring 102 is disposed on the outside of the sampling tube 401 and communicates with the gas storage chamber M. The sampling hole 403 can be disposed on the side wall of the sampling tip 402 or at the end of the sampling tip 402. Preferably, multiple sampling holes 403 are disposed on the side wall of the sampling tip 402.

[0041] The filter assembly 500 is disposed inside the sampling tube 401 and located between the first channel S and the sampling tip 402. The filter assembly 500 includes multiple filter screens, and the pore size of the multiple filter screens decreases sequentially along the direction of the sampling tip 402 and the first channel S.

[0042] Furthermore, the sampling tube 401 includes a first pipe 401a and a second pipe 401b, and a fixing ring 101 is connected to the first pipe 401a and the second pipe 401b respectively. The sampling tip 402 is located at the bottom of the second pipe 401b. The water-stop ring 102 is disposed between the first pipe 401a and the second pipe 401b. When the water-stop ring 102 is in the contracted state, it can be flush with the first pipe 401a and the second pipe 401b. When the sampling tube 401 is inserted into the sampling layer, it will not bulge and cause the gap to increase.

[0043] An air pump is installed at the end of the first pipe 401a. When sampling, the sampling tube 401 is inserted into the interleaved zone and reaches the sampling layer. The air pump then starts to pump air. When the air pump is pumping air, the air pressure inside the sampling tube 401 decreases. At this time, the top of the fixing ring 101 is in a negative pressure state. The moving column 201 can move under negative pressure. The mounting ring 202 moves along the fixing ring 101 to inject the gas inside the gas storage chamber M into the water-stop ring 102, causing the water-stop ring 102 to expand. When the mounting ring 202 moves to the sealing ring 104, the fixing plate 303 can coincide with the connecting hole 103. At this time, under the elastic force of the spring, the fixing plate 303 is inserted into the connecting hole 103, and the sealing plate 304 will move together to open the first channel S.

[0044] The water-stop ring 102 first expands and contacts the sampling layer, separating the gap between the upper and lower layers of the sampling layer. Then the first channel S is opened, and the air pump can extract the sample from the sampling hole 403, filter it through multiple stages, and collect it after passing through the first channel S and the first pipe 401a.

[0045] The remaining structure is the same as that in Example 3.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A negative pressure expansion ring, characterized in that: include, The mounting assembly (100) includes a fixing ring (101) and a water-stop ring (102) disposed on the side wall of the fixing ring (101). The fixing ring (101) is provided with a connecting hole (103) communicating with the water-stop ring (102) and a sealing ring (104) disposed inside the fixing ring (101). The expansion assembly (200) includes a movable post (201) slidably disposed inside the sealing ring (104), a mounting ring (202) disposed at the bottom of the movable post (201) and slidably connected to the inside of the fixed ring (101), and a first channel (S) disposed in the movable post (201) and the mounting ring (202). A gas storage chamber (M) is formed between the movable column (201), the mounting ring (202), the fixing ring (101), and the sealing ring (104), and the connecting hole (103) communicates with the gas storage chamber (M); and, The enclosure assembly (300) includes a mounting groove (301) disposed inside the mounting ring (202), a movable rod (302) elastically disposed inside the mounting groove (301), a fixing plate (303) disposed at one end of the movable rod (302), and a closing plate (304) disposed at the other end of the movable rod (302). The fixing plate (303) cooperates with the connecting hole (103), and the closing plate (304) blocks the first channel (S). After the mounting ring (202) moves along the fixing ring (101) to inject the gas inside the gas storage chamber (M) into the water-stopping ring (102), the fixing plate (303) overlaps with the connecting hole (103) and is inserted. At this time, the sealing plate (304) moves to open the first channel (S).

2. The negative pressure expansion ring according to claim 1, characterized in that: The fixed ring (101) is provided with a guide post (105) on its inner side, and the movable post (201) is provided with a limiting ring (203) that is slidably connected to the guide post (105) at its top. The guide post (105) and the connecting hole (103) are located on both sides of the sealing ring (104).

3. The negative pressure expansion ring according to claim 1 or 2, characterized in that: The mounting groove (301) includes a circular groove (301a) and a square groove (301b), the fixing plate (303) is located in the circular groove (301a), and the closing plate (304) is located in the square groove (301b).

4. The negative pressure expansion ring according to claim 3, characterized in that: A guide ring (305) is provided in the circular groove (301a), and the moving rod (302) is slidably inserted into the guide ring (305). An elastic element (307) is provided between the guide ring (305) and the fixed plate (303).

5. The negative pressure expansion ring according to claim 4, characterized in that: The bottom of both the circular groove (301a) and the square groove (301b) is provided with a vent hole (301c) that communicates with the inside of the fixing ring (101).

6. The negative pressure expansion ring according to claim 3 or 4, characterized in that: The mounting slot (301) is provided with multiple slots, and multiple sealing plates (304) are inserted into the first channel (S) with their ends contacting each other to isolate the first channel (S). The connecting holes (103) are provided in multiple ways, and each of the fixing plates (303) is inserted into one of the connecting holes (103).

7. An in-situ water absorption device, characterized in that: Including the negative pressure expansion ring as described in claim 6, and further comprising, The sampling assembly (400) includes a sampling tube (401) disposed on the outside of the fixing ring (101), a sampling tip (402) disposed at the bottom of the sampling tube (401), and a sampling hole (403) disposed in the sampling tip (402). The water-stop ring (102) is disposed on the outside of the sampling tube (401) and communicates with the gas storage chamber (M). A filter assembly (500) is disposed inside the sampling tube (401) and located between the first channel (S) and the sampling tip (402).

8. The in-situ water absorption device according to claim 7, characterized in that: The sampling tube (401) includes a first pipe (401a) and a second pipe (401b), the fixing ring (101) is connected to the first pipe (401a) and the second pipe (401b) respectively, and the sampling tip (402) is located at the bottom of the second pipe (401b); The water-stop ring (102) is disposed between the first pipe (401a) and the second pipe (401b).

9. The in-situ water absorption device according to claim 7 or 8, characterized in that: The sampling holes (403) are provided with multiple holes on the sidewalls of the sampling tips (402).

10. The in-situ water absorption device according to claim 7 or 8, characterized in that: The filter assembly (500) includes a plurality of filter screens, the pore size of which decreases sequentially along the direction of the sampling tip (402) and the first channel (S).

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