Sample separating device for COD (Chemical Oxygen Demand) detection

Abstract

The utility model discloses a sample separating device for COD (Chemical Oxygen Demand) detection, which comprises a sampling and separating cylinder and a siphon hose, an inner-layer limiting cylinder is arranged on the inner side of the bottom end of the sampling and separating cylinder, a separating basket is placed at the top end of the inner-layer limiting cylinder, the separating basket consists of a filter screen, a support disc and an external thread nut, and the filter screen is positioned at the bottom end of the separating basket; after a water sample on the inner side of the sampling and separating barrel is completely stood, a water suction port is positioned below the surface layer of the water sample by 50mm and sucks water to a to-be-detected sample separating bottle, a person pushes a push rod downwards, and the push rod drives a separating basket to dive downwards, so that the water suction port of a siphon hose and the liquid level of a water body in a water bucket synchronously move downwards; the height difference between the position of the water suction port of the siphon and the liquid level is kept consistent so as to achieve the purpose of taking water from the same layer, and through the matching arrangement of the filter screen and the supporting disc, the situation that the water suction port of the siphon hose is closer to the bottom sediment suspended matter layer along with the reduction of the water level, and sediment suspended matter is sucked into the inner side of the sample separation to-be-detected bottle to affect the sample separation water sample detection precision is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of COD detection, in particular to a sample separation device for COD detection. Background Art

[0002] COD monitoring, also known as "chemical oxygen demand," measures the amount of oxidant consumed by easily oxidizable substances in water under specified conditions. It is expressed in milligrams of oxygen consumed per liter of water sample. It is an important indicator of the organic matter content in water and a key indicator for assessing the extent of organic pollution.

[0003] The following problems also exist during the on-site water sample packaging process. The monitoring technical specifications clearly stipulate that after the water sample has been allowed to stand, the water inlet should be located 50mm below the surface of the water sample to absorb water into the sample bottle. If the siphon tube is inserted into the bucket at a position that is too high and does not meet the sampling requirements, and if it is too low, it will inhale impurities such as sediment and suspended matter, thus affecting the sampling quality. During the siphoning process, the liquid level of the water body in the bucket gradually drops, which requires the position of the siphon tube to move downward synchronously, and the height difference between the position of the siphon tube water inlet and the liquid surface must be kept consistent to achieve the purpose of "water extraction from the same layer" and ensure the sampling quality of the water body. As the water level drops, the water inlet of the siphon tube is closer to the bottom sediment suspended matter layer, which can easily cause sediment suspended matter to be inhaled into the sample bottle to be tested, affecting the accuracy of water sample detection. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a sampling device for COD detection, which is arranged in combination with a separation basket, a threaded sleeve and a push rod. After the water sample inside the sampling and sampling tube has been allowed to stand, the water suction port should be located 50 mm below the surface of the water sample to absorb water into the sampling bottle to be tested. A person pushes the push rod downward, and the push rod drives the separation basket to dive downward, so that the water suction port position of the siphon hose moves downward synchronously with the liquid level of the water body in the bucket. The height difference between the position of the water suction port of the siphon tube and the liquid level is kept consistent, so as to achieve the purpose of taking water from the same layer and ensure the sampling quality of the water body. Through the arrangement of the filter screen and the support plate, the water suction port position of the siphon hose is effectively reduced. As the water level drops, the water suction port is closer to the bottom sediment suspended matter layer, resulting in the sediment suspended matter being sucked into the inside of the sampling bottle to be tested, affecting the detection accuracy of the sampled water.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a sampling device for COD detection, including a sampling and dividing cylinder and a siphon hose, an inner limiting cylinder is provided on the inner side of the bottom end of the sampling and dividing cylinder, a separation basket is placed on the top of the inner limiting cylinder, the separation basket is composed of a filter screen, a support plate, and an externally threaded nut, the filter screen is located at the bottom end of the separation basket, the support plate is located at the top end of the sample bottle to be tested, a T-thread through hole is provided at the center of the support plate, the externally threaded nut is installed on the inner side of the T-thread through hole, two mounting holes are provided on the surface of the externally threaded nut, one end of the siphon hose passes through the two mounting holes, a rubber ring is provided on the surface of one end of the siphon port of the siphon hose, and through holes are evenly provided on the surface of the support plate. The top of the separation basket is provided with a threaded sleeve on both sides of the surface, and the top of the sampling and dividing cylinder is provided with a top cover, and the surface of the top cover is provided with a limited hole, and a push rod is installed on the inner side of the limited hole, and the bottom end of the push rod is threadedly connected to the threaded sleeve, and the top end of the push rod is provided with a non-slip handle. A circular hole is provided in the center of the top cover, and a threaded joint is installed at one end of the siphon hose passing through the circular hole. A placing rack is provided on one side of the sampling and dividing cylinder, and a placing plate is provided on the inside of the placing rack. Four placing holes are provided on the surface of the placing plate, and a sample bottle to be tested is placed inside the placing hole. A bottle cap is installed on the top of the sample bottle to be tested, and an externally threaded hollow column is provided at the center of the top of the bottle cap, and the threaded joint is threadedly connected to the externally threaded hollow column.

[0006] As an optimal technical solution of the present invention, a three-way joint is installed on the surface of the siphon hose, a siphon ball is installed at one end of the three-way joint, and valves are provided on the surfaces of the two branch pipes of the three-way joint.

[0007] As an optimal technical solution of the present invention, a mounting plate is provided at the bottom of the sampling and dividing cylinder, a base is provided at the bottom of the mounting plate, the base and the mounting plate are fixed by bolts, and a protective rubber pad is provided at the bottom of the base.

[0008] As a preferred technical solution of the present invention, a limiting rubber ring is provided inside the circular hole opened at the center of the top cover, and the limiting rubber ring is sleeved on the surface of the siphon hose.

[0009] As an optimal technical solution of the present invention, a C-shaped clip is provided on the surface of the push rod, and the C-shaped clip is located on the outside of the top of the top cover. A handle is provided on the surface of the top cover, and rotating handles are installed on both sides of the top of the sampling and dividing tube.

[0010] As a preferred technical solution of the present invention, the surface of the sampling and dividing cylinder is provided with scale lines, and one side of the bottom end of the sampling and dividing cylinder is provided with a liquid discharge tube.

[0011] As a preferred technical solution of the present invention, a groove is provided at the center of the bottom end of the placement rack, and a limiting column is provided at the center of the top end of the placement rack.

[0012] As an optimal technical solution of the present utility model, the surface of the externally threaded hollow column arranged at the top of the bottle cap is covered with a sealing rubber cap, the sampling and dividing cylinder is fixedly connected to the inner limiting cylinder, the sampling and dividing cylinder and the inner limiting cylinder are made of transparent PVC material, the base, the partition basket and the top cover are made of stainless steel, and foot pedals are provided on both sides.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. Through the matching setting of the separation basket, threaded sleeve and push rod, after the water sample inside the sampling and dividing cylinder has been allowed to stand, the water suction port should be located 50mm below the surface of the water sample to absorb water into the sample-to-be-tested bottle. The person pushes the push rod downward, and the push rod drives the separation basket downward, so that the water suction port position of the siphon hose moves downward synchronously with the liquid level in the bucket. The height difference between the position of the siphon pipe water suction port and the liquid level is kept consistent to achieve the purpose of taking water from the same layer and ensure the quality of water sampling. Through the matching setting of the filter screen and the support plate, the water suction port position of the siphon hose is effectively reduced. As the water level drops, the water suction port is closer to the bottom sediment suspended matter layer, causing the sediment suspended matter to be sucked into the inside of the sample-to-be-tested bottle, affecting the detection accuracy of the sampled water.

[0015] 2. The combination of the three-way connector, siphon ball and valve makes the flow of the siphon hose controllable, and facilitates installation on the cap surface of an empty sample bottle after the threaded connector is disassembled; a C-shaped clip is provided on the surface of the push rod to facilitate temporary limit fixation of the push rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the utility model.

[0017] Figure 2 This is a schematic diagram of the top view of the sampling tube of the present invention.

[0018] Figure 3 This is a schematic diagram of the top view of the partition bar of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure of the sample separation bottles to be tested and the placement rack from a top view of the present invention.

[0020] 1. Sampling and dividing cylinder; 2. Siphon hose; 3. Base; 4. Mounting plate; 5. Inner limiting cylinder; 6. Drain pipe; 7. Separation basket; 8. Threaded sleeve; 9. Push rod; 10. Top cover; 11. C-type clip; 12. Limiting rubber ring; 13. T-joint; 14. Siphon ball; 15. Threaded joint; 16. Bottle cap; 17. Bottle for sample separation; 18. Placement rack; 19. Filter; 20. Support plate; 21. Externally threaded nut; 22. T-threaded through hole; 23. Foot pedal; 24. Mounting hole; 25. Limiting column. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments. However, the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] For example, please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4As shown, the utility model provides a COD detection sampling device, including a sampling and sampling cylinder 1, a siphon hose 2, an inner limiting cylinder 5 is provided on the inner side of the bottom end of the sampling and sampling cylinder 1, a separation basket 7 is placed on the top of the inner limiting cylinder 5, and the separation basket 7 is composed of a filter 19, a support plate 20, and an externally threaded nut 21. The filter 19 is located at the bottom end of the separation basket 7, the support plate 20 is located at the top end of the sample-to-be-tested bottle 17, a T-thread through hole 22 is provided at the center of the support plate 20, and the externally threaded nut 21 is installed inside the T-thread through hole 22. Two mounting holes 24 are provided on the surface of the nut 21. One end of the siphon hose 2 passes through the two mounting holes 24. A rubber ring is provided on the surface of the siphon port of the siphon hose 2. Through holes are evenly provided on the surface of the support plate 20. Threaded sleeves 8 are provided on both sides of the top of the separation basket 7. A top cover 10 is provided on the top of the sampling and dividing cylinder 1. A limiting hole is provided on the surface of the top cover 10. A push rod 9 is installed inside the limiting hole. The bottom end of the push rod 9 is threadedly connected to the threaded sleeve 8. A non-slip handle is provided on the top of the push rod 9. A round hole is provided at the center of the top cover 10. A threaded connector 15 is installed at one end of the siphon hose 2 passing through the circular hole, a placement rack 18 is provided on one side of the sampling and dividing cylinder 1, a placement tray is provided inside the placement rack 18, four placement holes are provided on the surface of the placement tray, a sample-to-be-tested bottle 17 is placed inside the placement hole, a bottle cap 16 is installed on the top of the sample-to-be-tested bottle 17, an externally threaded hollow column is provided at the center of the top of the bottle cap 16, and the threaded connector 15 is threadedly connected to the externally threaded hollow column; through the matching arrangement of the separation basket 7, the threaded sleeve 8, and the push rod 9, the water sample inside the sampling and dividing cylinder 1 is allowed to stand still, and the water inlet position should be located at 50° on the surface of the water sample. mm below to absorb water into the sample-to-be-tested bottle 17, the person pushes the push rod 9 downward, and the push rod 9 drives the separation basket 7 to dive downward so that the water suction port position of the siphon hose 2 moves downward synchronously with the liquid level of the water body in the bucket, and the height difference between the water suction port position of the siphon tube and the liquid level is kept consistent, so as to achieve the purpose of taking water in the same layer and ensure the sampling quality of the water body. Through the matching arrangement of the filter screen 19 and the support plate 20, the water suction port position of the siphon hose 2 is effectively reduced. As the water level drops, the water suction port is closer to the bottom sediment suspended matter layer, resulting in the sediment suspended matter being sucked into the inside of the sample-to-be-tested bottle 17, affecting the detection accuracy of the sampled water.

[0023] like Figure 1 As shown, a three-way connector 13 is installed on the surface of the siphon hose 2, a siphon ball 14 is installed at one end of the three-way connector 13, and valves are provided on the surfaces of the two branch pipes of the three-way connector 13; through the matching arrangement of the three-way connector 13, the siphon ball 14 and the valve, the flow of the siphon hose 2 can be controlled, and the threaded connector 15 can be easily disassembled and installed on the surface of the bottle cap 16 of the empty sample-to-be-tested bottle 17.

[0024] like Figure 1As shown, the bottom of the sampling and dividing tube 1 is provided with a mounting plate 4, the bottom of the mounting plate 4 is provided with a base 3, the base 3 and the mounting plate 4 are fixed by bolts, and the bottom of the base 3 is provided with a protective rubber pad; through the matching arrangement of the base 3, the mounting plate 4 and the protective rubber pad, the bottom of (1) is made more solid and durable.

[0025] like Figure 1 As shown, a limiting rubber ring 12 is provided inside the circular hole opened at the center of the top cover 10, and the limiting rubber ring 12 is sleeved on the surface of the siphon hose 2; by sleeved on the surface of the siphon hose 2, the wear between the surface of the siphon hose 2 and the circular hole is effectively reduced.

[0026] like Figure 1 As shown, a C-shaped clip 11 is sleeved on the surface of the push rod 9, and the C-shaped clip 11 is located on the outside of the top end of the top cover 10. A handle is provided on the surface of the top cover 10, and rotating handles are installed on the surfaces of both sides of the top end of the sampling and dividing tube 1; by sleeved on the surface of the push rod 9 with a C-shaped clip 11, the push rod 9 is temporarily limited and fixed.

[0027] like Figure 1 As shown, scale lines are provided on the surface of the sampling and dividing cylinder 1, and a drainage pipe 6 is provided on one side of the bottom end of the sampling and dividing cylinder 1; by providing the drainage pipe 6 on one side of the bottom end of the sampling and dividing cylinder 1, it is convenient to discharge the water sample inside the sampling and dividing cylinder 1, and by providing scale lines on the surface of the sampling and dividing cylinder 1, it is convenient for personnel to push the push rod 9 according to the drop in water level so that the water suction port of the siphon hose 2 always maintains a distance of 50 mm from the water surface during the water suction process.

[0028] like Figure 1 、 Figure 4 As shown, a groove is provided at the center of the bottom end of the placement rack 18, and a limiting column 25 is provided at the center of the top end of the placement rack 18; the combination of the groove and the limiting column 25 facilitates the stacking of the placement racks 18.

[0029] like Figure 1 As shown, the surface of the externally threaded hollow column arranged at the top of the bottle cap 16 is covered with a sealing rubber cap, the sampling and dividing cylinder 1 is fixedly connected to the inner limiting cylinder 5, the sampling and dividing cylinder 1 and the inner limiting cylinder 5 are made of PVC transparent material, the base 3, the separation basket 7, and the top cover 10 are made of stainless steel, and foot pedals 23 are provided on both sides of the base 3; by setting the base 3, the separation basket 7, and the top cover 10 to stainless steel, the service life of the sampling and dividing cylinder 1 is extended.

[0030] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A COD detection sampling device, comprising a sampling and sampling cylinder (1) and a siphon hose (2), characterized in that: An inner limiting cylinder (5) is provided on the inner side of the bottom end of the sampling and dividing cylinder (1), and a separation basket (7) is placed on the top end of the inner limiting cylinder (5). The separation basket (7) is composed of a filter screen (19), a support plate (20), and an externally threaded nut (21). The filter screen (19) is located at the bottom end of the separation basket (7), and the support plate (20) is located at the top end of the sample-to-be-tested bottle (17). A T-threaded through hole (22) is provided at the center of the support plate (20), and the externally threaded nut (21) is installed on the inner side of the T-threaded through hole (22). Two mounting holes (24) are provided on the surface of the externally threaded nut (21). One end of the siphon hose (2) passes through the two mounting holes (24). A rubber ring is provided on the surface of one end of the siphon port of the siphon hose (2). Through holes are evenly provided on the surface of the support plate (20). Threaded sleeves are provided on both sides of the top end of the separation basket (7). The sampling and dividing cylinder (8) is provided with a top cover (10) at the top end, a limiting hole is provided on the surface of the top cover (10), a push rod (9) is installed inside the limiting hole, the bottom end of the push rod (9) is threadedly connected to the threaded sleeve (8), and a non-slip handle is provided at the top end of the push rod (9). A circular hole is provided at the center of the top cover (10), and a threaded joint (15) is installed at one end of the siphon hose (2) passing through the circular hole. A placement rack (18) is provided on one side of the sampling and dividing cylinder (1), a placement plate is provided on the inside of the placement rack (18), four placement holes are provided on the surface of the placement plate, and a sample-to-be-tested bottle (17) is placed inside the placement hole. A bottle cap (16) is installed on the top end of the sample-to-be-tested bottle (17), and an externally threaded hollow column is provided at the center of the top end of the bottle cap (16). The threaded joint (15) is threadedly connected to the externally threaded hollow column.

2. A COD detection sampling device according to claim 1, characterized in that: A three-way joint (13) is installed on the surface of the siphon hose (2), a siphon ball (14) is installed at one end of the three-way joint (13), and valves are provided on the surfaces of the two branch pipes of the three-way joint (13).

3. A COD detection sampling device according to claim 1, characterized in that: The bottom end of the sampling and dividing cylinder (1) is provided with a mounting plate (4), the bottom end of the mounting plate (4) is provided with a base (3), the base (3) and the mounting plate (4) are fixed by bolts, and the bottom end of the base (3) is provided with a protective rubber pad.

4. A COD detection sampling device according to claim 1, characterized in that: A limiting rubber ring (12) is provided inside the circular hole opened at the center of the top cover (10), and the limiting rubber ring (12) is sleeved on the surface of the siphon hose (2).

5. A COD detection sampling device according to claim 1, characterized in that: The push rod (9) is sleeved with a C-shaped clip (11), and the C-shaped clip (11) is located outside the top of the top cover (10). The top cover (10) is provided with a handle, and the two sides of the top of the sampling and dividing cylinder (1) are provided with rotating handles.

6. A COD detection sampling device according to claim 1, characterized in that: The surface of the sampling and dividing cylinder (1) is provided with scale lines, and a liquid discharge pipe (6) is provided on one side of the bottom end of the sampling and dividing cylinder (1).

7. A COD detection sampling device according to claim 1, characterized in that: A groove is provided at the center of the bottom end of the placement rack (18), and a limiting column (25) is provided at the center of the top end of the placement rack (18).

8. A COD detection sampling device according to claim 3, characterized in that: The surface of the externally threaded hollow column arranged at the top of the bottle cap (16) is covered with a sealing rubber cap, and the sampling and dividing cylinder (1) is fixedly connected to the inner limiting cylinder (5). The sampling and dividing cylinder (1) and the inner limiting cylinder (5) are made of transparent PVC material, and the base (3), the separation basket (7) and the top cover (10) are made of stainless steel. Foot pedals (23) are provided on both sides of the (3).

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