Dissolved oxygen test auxiliary device

Abstract

The utility model relates to the field of fluid or liquid sampling devices, in particular to a dissolved oxygen testing auxiliary device which comprises a cylindrical main body for containing a water sample to be tested, a water inlet for the water sample to be tested to enter is formed in the cylindrical main body, and a detection tube inlet for a detection tube to be installed in a sealing and sliding mode is further formed in the cylindrical main body. A shearing arm used for shearing the detection pipe is further installed on the cylindrical main body in a floating mode, a detection pipe outlet is further formed in the position, corresponding to the detection pipe inlet, of the cylindrical main body, and a sealing rubber plug used for blocking the opening of the detection pipe is installed in the detection pipe outlet in a sealed mode. The problem that in the prior art, when a water sample to be detected is moved out, a detection tube makes contact with outside air, and then the detection accuracy is affected is solved.

Description

Technical Field

[0001] The utility model relates to the field of fluid or liquid sampling devices, in particular to a dissolved oxygen test auxiliary device. Background Art

[0002] In the prior art, when testing the dissolved oxygen and other contents of sewage in oil fields, according to the provisions of the standard SY / T5329-2022, a vacuum detection tube-electronic colorimetry method is used for testing. Vacuum detection tube-electronic colorimetry: first control the water flow rate at 5L / min to 6L / min and take a sample after flowing for 3 minutes, then connect the dissolved oxygen detection plastic cup to the sampling hose, adjust the flow rate to 0.5L / min to 1L / min, and let the water flow for several minutes until there are no bubbles. Then insert the detection tube into the water sample to be tested, and break the capillary part of the detection tube after the water flow stabilizes, and the water sample to be tested is sucked into the capillary. Then take out the detection tube and wipe it dry, and then invert it back and forth several times to mix the solution in the tube evenly. Then insert the detection tube into the tester for on-site testing.

[0003] After the detection tube is inserted into the water sample to be tested, the detection tube is broken. Since the inside of the detection tube is a negative pressure environment, the water sample to be tested will be sucked into the detection tube and contact the reagent in the detection tube. At this time, the dissolved oxygen in the water sample to be tested will react with the reagent to cause the reagent in the detection tube to change color. Generally, in order to ensure that the reaction can be fully carried out, after the water sample to be tested is sucked into the detection tube, the detection tube needs to be inverted back and forth to ensure that the dissolved oxygen in the water sample to be tested can fully react with the reagent. However, when the above method is used for detection, the cup body for receiving the measured water sample is an open device, and the operator breaks the capillary at the upper end of the detection tube in an open environment. The volume of the detection tube is very small. When the detection tube is removed from the water sample to be tested at the end of the test, since the detection tube is in an open state, it is likely to seriously affect the accuracy of the test due to the inhalation of more gas. The test standard deviation of dissolved oxygen is large, the reproducibility is poor, and the data accuracy is low. And because the water sample flow rate at the wellhead is too fast and unstable, there is a high possibility of large bubbles mixed in the water flow. When sampling, the large bubbles will break into multiple small bubbles. Some of the small bubbles cannot be discharged directly and remain in the water. If the detection tube breaks and contacts these small bubbles, the small bubbles will be sucked into the detection tube, which will also affect the accuracy of the test. Utility Model Content

[0004] The utility model aims to provide a dissolved oxygen test auxiliary device to solve the problem in the prior art that when a detection tube is removed from a water sample to be tested, it will come into contact with the outside air, thereby affecting the accuracy of the detection.

[0005] A dissolved oxygen test auxiliary device comprises a cylindrical main body for containing a water sample to be tested, a water inlet for the water sample to be tested being arranged on the cylindrical main body, a detection tube inlet for sealing and sliding installation of the detection tube being provided on the cylindrical main body, a shear arm for cutting off the detection tube being floatingly installed on the cylindrical main body, a detection tube outlet being provided on the cylindrical main body at a position corresponding to the detection tube inlet, and a sealing rubber plug for blocking the detection tube opening being sealed and installed in the detection tube outlet.

[0006] Furthermore, a shear return spring is arranged on the shear arm to keep the shear arm away from the shear detection tube.

[0007] Furthermore, a supporting rod for supporting the detection tube is also provided in the cylindrical body. The supporting rod is opposite to the shear arm and is staggeredly arranged between the shear arm and the inlet of the detection tube.

[0008] Furthermore, a cutting knife is floatingly installed in the cylindrical body, and a cutting blade for cutting the detection tube is provided at the end of the cutting knife.

[0009] Furthermore, the cutting knife is provided with a cutting return spring to keep the cutting knife away from the position of cutting the detection tube.

[0010] Furthermore, the cutting knife is arranged opposite to the supporting rod.

[0011] Furthermore, the water inlet is arranged on the side wall close to the bottom of the cylindrical body.

[0012] Furthermore, a guide plate inclined downward for guiding the water sample to be tested downward is provided at the water inlet.

[0013] Furthermore, the shear arm seal is installed in a floating manner on the cylindrical body, and the cylindrical body is also provided with an exhaust port, and the exhaust port is provided with an exhaust valve for closing the exhaust port.

[0014] The utility model provides a new dissolved oxygen test auxiliary device, specifically: first, the detection tube is loaded into the cylindrical main body through the detection tube inlet, and then the water sample to be tested is injected into the cylindrical main body through the water inlet, and then the detection tube is cut off by the shear arm, and then the detection tube is pushed into the detection tube outlet, so that the sealing rubber plug seals the detection tube, and then the detection tube is moved out. The utility model uses the cylindrical main body to hold the water sample to be tested, so that the detection tube is immersed in the water sample to be tested, and then the detection tube is cut off by the shear arm, and finally the detection tube is sealed by the sealing rubber plug, so that the detection tube will not contact with the outside air during actual use, thereby ensuring the accuracy of the detection result of the detection tube, and solving the problem in the prior art that the detection tube will contact with the outside air when the water sample to be tested is moved out, thereby affecting the accuracy of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1This is a structural schematic diagram of a dissolved oxygen testing auxiliary device according to Embodiment 1 of the present utility model;

[0016] Figure 2 A partial cross-sectional view of a dissolved oxygen testing auxiliary device according to Embodiment 1 of the present utility model;

[0017] Figure 3 It is a structural schematic diagram of the detection tube inlet of the dissolved oxygen test auxiliary device of the first embodiment of the dissolved oxygen test auxiliary device of the utility model;

[0018] Figure 4 This is a structural schematic diagram of a detection tube outlet of a dissolved oxygen testing auxiliary device of Embodiment 1 of the dissolved oxygen testing auxiliary device of the utility model.

[0019] In the figure: 1. cylindrical body; 2. shear arm; 3. shear reset spring; 4. shear plate; 5. cutting knife; 6. cutting blade; 7. supporting rod; 8. supporting plate; 9. first sealing cover; 10. second sealing cover; 11. detection tube; 12. detection tube inlet; 13. detection tube outlet; 14. sealing rubber plug; 15. guide plate; 16. water inlet; 17. exhaust port; 18. first elastic sealing ring; 19. second elastic sealing ring; 20. cutting reset spring. DETAILED DESCRIPTION

[0020] The specific concept of the dissolved oxygen test auxiliary device of the utility model is:

[0021] A dissolved oxygen test auxiliary device includes a cylindrical body with one end blocked for containing a water sample to be tested. The cylindrical body is provided with a water inlet for the water sample to be tested to enter, and a valve for blocking the water inlet is provided on the water inlet so that the cylindrical body is closed after the water sample to be tested is immersed in a test tube, and a test tube inlet for sealing and sliding installation of the test tube is also provided on the cylindrical body, and a shear arm for cutting the test tube is also floatingly installed on the cylindrical body, and a test tube outlet is also provided at a position corresponding to the test tube inlet on the cylindrical body, and the test tube outlet is arranged opposite to the test tube inlet, and a sealing rubber plug for blocking the opening of the test tube is sealed and installed in the test tube outlet.

[0022] The detection tube is loaded into the cylindrical body through the detection tube inlet, and then the water sample to be tested is injected into the cylindrical body through the water inlet so that the detection tube is immersed in the water sample to be tested. Then the detection tube is cut by the shear arm so that the water sample to be tested can enter the detection tube. When the water sample to be tested enters the detection tube, the detection tube is pushed to slide relative to the cylindrical body until the detection tube enters the detection tube outlet, and the sealing rubber plug seals the detection tube. Finally, the detection tube is taken out from the detection tube outlet.

[0023] The utility model provides a new dissolved oxygen test auxiliary device, through which the detection tube is kept in the water sample to be tested from a closed and unopened state until the detection tube is sealed again by a sealing rubber plug, and will not come into contact with the outside air, and the oxygen in the outside air will not interfere with the test result, thus solving the problem in the prior art that the detection tube will come into contact with the outside air when in use, thereby affecting the accuracy of the detection.

[0024] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0025] Embodiment 1 of the dissolved oxygen test auxiliary device of the present utility model:

[0026] like Figure 1-4As shown: a dissolved oxygen test auxiliary device, including a cylindrical body 1 with one end blocked for containing a water sample to be tested. The cylindrical body 1 is provided with a water inlet 16 for the water sample to be tested, and a valve for blocking the water inlet 16 is provided on the water inlet 16 so as to close the cylindrical body 1 after sampling. The cylindrical body 1 is also provided with a detection tube inlet 12 for sealing and sliding installation of a detection tube 11, and a first elastic sealing ring 18 is provided in the detection tube inlet 12. The first elastic sealing ring 18 cooperates with the detection tube to realize the sealing and sliding installation of the detection tube 11 in the detection tube inlet 12. The cylindrical body 1 is also provided with a shear arm 2 for cutting off the detection tube 11 in a floating manner, and the cylindrical body 1 is provided with a detection tube outlet 13 at a position corresponding to the detection tube inlet 12, and the detection tube outlet 13 is arranged opposite to the detection tube inlet 12, and a sealing rubber plug 14 for blocking the opening of the detection tube 11 is sealed and installed in the detection tube outlet 13. A second elastic sealing ring 19 is arranged in the detection tube outlet 13, and the second elastic sealing ring 19 cooperates with the sealing rubber plug 14 to realize the sealing installation of the sealing rubber plug 14. A first sealing cover 9 and a second sealing cover 10 are arranged at both ends of the cylindrical body 1 to seal the cylindrical body 1. A shear arm mounting hole is provided on the first sealing cover 9, and the shear arm 2 is sealed and floatingly installed on the cylindrical body 1 through the shear arm 2 mounting hole. A detection tube inlet 12 and a detection tube outlet 13 opposite to the detection tube inlet 12 are provided on the side wall of the cylindrical body 1. An arc-shaped shear plate 4 matching the shape of the detection tube 11 is provided at one end of the shear arm 2 for contacting the detection tube 11, and a push plate is provided at the other end for the operator to push the shear arm 2 to move. When cutting the detection tube 11, the operator pushes the shear arm 2 to move toward the detection tube 11, and the detection tube 11 is cut by the cooperation between the edge of the detection tube inlet 12 and the shear arm 2. However, since the detection tube 11 needs to continue to move toward the detection tube outlet 13 after being cut, if the shear arm 2 still stays at the position where the detection tube 11 is cut, the shear arm 2 will interfere with the detection tube 11. Therefore, preferably: a shear reset spring 3 is mounted on the shear arm 2, one end of the shear reset spring 3 is fixed relative to the shear arm 2, and the other end is fixed relative to the cylindrical body 1. The shear reset spring 3 is arranged on the shear arm 2 to keep the shear arm 2 away from the position where the detection tube 11 is cut. The shear reset spring 3 is arranged outside the cylindrical body 1, one end of the shear reset spring 3 abuts on the first sealing cover 9, and the other end abuts on the push plate of the shear arm 2. When the shear arm 2 shears the detection tube 11, the shear reset spring 3 is compressed, and after the detection tube 11 is cut, the shear reset spring 3 extends to drive the shear arm 2 back to the initial position. By setting the shear reset spring 3, the shear arm 2 is kept in a position where it will not interfere with the detection tube 11 for a long time. When the detection tube 11 needs to be cut, the shear arm 2 is driven to cut the detection tube 11. After cutting, the shear arm 2 is reset under the action of the shear reset spring 3 to prevent the shear arm 2 from interfering with the movement of the detection tube 11.

[0027] In the above scheme, the shear arm 2 cooperates with the edge of the detection tube inlet 12 to cut the detection tube 11, but the shearing effect of the detection tube 11 is relatively poor when this method is used to cut the detection tube 11, and the cutting position of the detection tube 11 cannot be confirmed. Therefore, preferably: a supporting rod 7 for supporting the detection tube 11 is also provided in the cylindrical body 1, and the supporting rod 7 is opposite to the shear arm 2 and is staggered between the shear arm 2 and the detection tube inlet 11. The supporting rod 7 is fixed to the second sealing cover 10, and the end of the supporting rod 7 is provided with an arc-shaped supporting plate 8 adapted to the detection tube 11. The detection tube 11 is placed on the supporting plate 8 after extending into the cylindrical body 1. The shear arm 2 is installed between the supporting rod 7 and the detection tube outlet 13. When cutting the detection tube 11, the shear arm 2 moves toward the supporting rod 7 until the shear plate 4 of the shear arm 2 contacts the detection tube 11, and the shear plate 4 of the shear arm 2 cooperates with the supporting plate 8 of the supporting rod 7 to complete the shearing. The purpose of shearing the detection tube 11 is achieved by the cooperation between the shear arm 2 and the supporting rod 7 , and relatively speaking, the shearing position of the detection tube 11 can be better confirmed.

[0028] However, if the detection tube 11 is sheared directly by the cooperation of the shear arm 2 and the supporting rod 7, an uneven fracture will appear on the detection tube 11, resulting in a poor cooperation effect between the detection tube 11 and the sealing plug 14. Therefore, preferably: a cutting knife 5 is also floatingly installed in the cylindrical body 1, and a cutting blade 6 for cutting the detection tube 11 is provided at the end of the cutting knife 5, and a push plate is provided at the other end of the cutting knife 5. After the detection tube 11 enters the cylindrical body 1, the cutting knife 5 is pushed until the cutting blade 6 is pressed against the detection tube 11. At this time, the cutting knife 5 reaches the cutting position, rotates the detection tube 11, and forms an annular notch on the detection tube 11. Then the shear arm 2 is driven to cut the detection tube 11 along the annular notch. By providing the cutting knife 5, the detection tube 11 is easier to disconnect, and the port is more neat. When the detection tube 11 and the sealing plug 14 are installed, a better sealing effect can be achieved.

[0029] And in order to prevent the cutting knife 5 from interfering with the detection tube 11, preferably: the cutting knife 5 is provided with a cutting reset spring 20 to keep the cutting knife 5 away from the position of cutting the detection tube 11. The cutting reset spring 20 is mounted on the cutting knife 5, one end of the cutting reset spring 20 is pressed against the first sealing cover 9, and the other end is pressed against the push plate of the cutting knife 5. When the detection tube 11 is extended to the specified position, the push plate of the cutting knife 5 is pushed, and the cutting reset spring 20 is compressed so that the cutting blade 6 contacts the detection tube 11, and the detection tube 11 is rotated so that an annular notch is formed on the detection tube 11. Then the cutting knife 5 is released, and the cutting reset spring 20 is actuated to reset the cutting knife 5. By setting the cutting reset spring 20, the cutting knife 5 can return to its original position after cutting the surface of the detection tube 11, so as to prevent the cutting knife 5 from remaining in the cutting position and interfering with the detection tube 11 after the cutting is completed, thereby affecting the subsequent operation.

[0030] At the same time, in order to make the cutting knife 5 more labor-saving when forming the annular notch and the depth of the annular notch can be deeper so that the subsequent shearing is more labor-saving, preferably: the cutting knife and the supporting rod are arranged relative to each other. The cutting knife 5 is set at a position close to the shearing arm 2 relative to the supporting plate 8. When cutting, the supporting plate 8 is equivalent to a chopping board, which makes the cutting knife 5 more labor-saving when cutting, and the depth of the annular notch formed is deeper, so that the subsequent shearing arm 2 saves more labor when cutting the detection tube 11.

[0031] There are many positions where the water inlet 16 can be opened on the cylindrical body 1, for example: on the side wall of the cylindrical body 1, on the first sealing cover 9 of the cylindrical body 1 and on the second sealing cover 10 of the cylindrical body 1. However, if the water inlet 16 is opened at a higher position on the cylindrical body 1, or the water inlet 16 is opened at the bottom of the cylindrical body 1, the air in the cylindrical body 1 will be entrained into the water sample to be tested when the water sample to be tested enters the cylindrical body 1, resulting in inaccurate results when measuring the oxygen content of the water sample to be tested. Therefore, preferably: the water inlet 16 is arranged on the side wall close to the bottom of the cylindrical body 1. The water inlet 16 is arranged on the side wall close to the bottom of the cylindrical body 1, so that the water sample to be tested is directly at the bottom of the cylindrical body 1 after entering the cylindrical body 1, and the air in the cylindrical body 1 can be gradually squeezed out, and the situation of entraining air will not occur, so that the test result is more accurate.

[0032] However, due to the difficulty of the manufacturing process, the water inlet 16 cannot be set close to the bottom of the cylindrical body 1, and in order to improve the sampling efficiency, the flow rate of the water sample to be tested is also relatively fast, so preferably: the water inlet 16 is also provided with a guide plate 15 inclined downward for guiding the water sample to be tested downward. The guide plate 15 is fixed on the cylinder wall of the cylindrical body 1, and the position where the guide plate 15 is fixed to the cylindrical body 1 is slightly higher than the water inlet 16. When the water sample to be tested enters the cylindrical body 1 through the water inlet 16, the water sample to be tested first hits the guide plate 15, and flows directly to the bottom of the cylindrical body 1 through the drainage of the guide plate 15. Because the speed of the water sample to be tested is reduced, and the water sample to be tested flows directly to the bottom of the cylindrical body. The water sample to be tested can squeeze out the air in the cylindrical body 1, so that no air is entrained in the cylindrical body 1, thereby ensuring the accuracy of the test result.

[0033] Although the first elastic sealing ring 18 and the second elastic sealing ring 19 are respectively provided in the detection tube inlet 12 and the detection tube outlet 13, and the diameters of the detection tube inlet 12 and the detection tube outlet 13 are relatively small, the first elastic sealing ring 18 and the second elastic sealing ring 19 cannot close the detection tube inlet 12 and the detection tube outlet 13, so that the water sample to be tested cannot flow out after the detection is completed. Therefore, preferably: an exhaust port 17 is also provided on the cylindrical main body 1, and an exhaust valve for closing the exhaust port is provided on the exhaust port 17. Since the shear arm 2 and the cutting knife 5 are sealed and floatingly installed on the cylindrical main body 1. The air inside the cylindrical main body 1 can only be discharged through the exhaust port 17 provided on the first sealing cover 9. When the water sample to be tested in the cylindrical main body 1 immerses the detection tube 11, the water inlet 16 is closed, and then the exhaust valve is closed, so that the cylindrical main body 1 is in a closed state. The detection tube 11 is then cut off by the shear arm 2, so that the water sample to be tested is sucked into the detection tube 11, and then the detection tube 11 is pushed to move until it cooperates with the sealing plug 14 to seal the detection tube 11, and then the detection tube 11 is removed. After the detection tube 11 is removed, a certain vacuum degree will be generated in the cylindrical body 1, so the water sample to be tested will not flow out. An exhaust pipe 17 is provided and an exhaust valve is provided on the exhaust pipe 17 so that the cylindrical body 1 can be closed. When the cylindrical body 1 is closed, the detection tube 11 is removed, so that a certain vacuum degree is generated in the cylindrical body 1, so that the water sample to be tested in the cylindrical body 1 will not flow out, thereby avoiding contamination.

[0034] When in use, first extend the detection tube 11 into the cylindrical body 1 through the detection tube inlet 12, then connect the water inlet 16 to the wellhead water outlet, open the water inlet 16 to allow the water sample to be tested to enter the cylindrical body 1, and when the water sample to be tested in the cylindrical body 1 immerses the detection tube 11, close the water inlet 16 and the exhaust valve on the exhaust pipe 17. Then drive the cutting knife 5 to move until the cutting blade 6 is pressed against the detection tube 11, rotate the detection tube 11, and form an annular notch. Release the cutting knife 5, and the cutting knife 5 is reset under the action of the cutting reset spring 20. Drive the shear arm 2 to move, and cut the detection tube 11 through the cooperation of the shear arm 2 and the supporting rod 7. Release the shear arm 2, and under the action of the shear reset spring 3, the shear arm 2 is reset. Then push the detection tube 11 into the detection tube outlet 13, complete the assembly of the detection tube 11 and the sealing plug 14, and take the detection tube 11 out of the detection tube outlet 13. After being taken out, the detection tube 11 is repeatedly inverted so that the dissolved oxygen in the water sample to be tested fully reacts with the reagent in the detection tube 11. Finally, the detection tube 11 is inserted into a detection instrument to obtain the dissolved oxygen content in the water sample to be tested.

[0035] Of course, the device of the present invention can also be used in the detection of ferrous ions or total iron to prevent the irregular cross section of the detection tube 11 from harming the operator.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dissolved oxygen test auxiliary device, characterized in that: The utility model comprises a cylindrical main body for containing a water sample to be tested, wherein the cylindrical main body is provided with a water inlet for the water sample to be tested to enter, the cylindrical main body is also provided with a detection tube inlet for sealing and sliding installation of the detection tube, the cylindrical main body is also provided with a shear arm for cutting off the detection tube for floating installation, the cylindrical main body is also provided with a detection tube outlet at a position corresponding to the detection tube inlet, and a sealing rubber plug for sealing the detection tube opening is sealedly installed in the detection tube outlet.

2. The dissolved oxygen test auxiliary device according to claim 1, characterized in that: The shear arm is provided with a shear return spring to keep the shear arm away from the shear detection tube.

3. The dissolved oxygen test auxiliary device according to claim 1, characterized in that: A supporting rod for supporting the detection tube is also arranged in the cylindrical body. The supporting rod is opposite to the shear arm and is staggeredly arranged between the shear arm and the inlet of the detection tube.

4. The dissolved oxygen test auxiliary device according to claim 3, characterized in that: A cutting knife is also floatingly installed in the cylindrical body, and a cutting blade for cutting the detection tube is arranged at the end of the cutting knife.

5. The dissolved oxygen test auxiliary device according to claim 4, characterized in that: The cutting knife is provided with a cutting return spring to keep the cutting knife away from the position of cutting the detection tube.

6. The dissolved oxygen test auxiliary device according to claim 5, characterized in that: The cutting knife is arranged opposite to the supporting rod.

7. The dissolved oxygen test auxiliary device according to any one of claims 1 to 6, characterized in that: The water inlet is arranged on the side wall close to the bottom of the cylindrical body.

8. The dissolved oxygen test auxiliary device according to claim 7, characterized in that: The water inlet is also provided with a guide plate inclined downward for guiding the water sample to be tested downward.

9. The dissolved oxygen test auxiliary device according to any one of claims 1 to 6, characterized in that: The shear arm seal is installed in a floating manner on the cylindrical body. The cylindrical body is also provided with an exhaust port, and the exhaust port is provided with an exhaust valve for closing the exhaust port.

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