BOD (Biochemical Oxygen Demand) dilution stabilizing device

Abstract

The utility model provides a BOD (Biochemical Oxygen Demand) dilution stabilizing device which comprises a base, a measuring cylinder and a stand column are arranged on the base, a three-opening communicating pipe is fixedly arranged on the stand column, a horizontal opening of the three-opening communicating pipe is communicated with the measuring cylinder through a liquid absorption soft guide pipe, two vertical openings of the three-opening communicating pipe are provided with double-ball pipes, and the end parts of the double-ball pipes are communicated with a dissolved oxygen bottle through soft guide pipes. By additionally arranging the water flow guiding and adjusting device and the stabilizing device, the instability of the rubber hose in the using process is solved, and operation is convenient; the generation of bubbles in the dilution process is avoided; and parallel samples are simultaneously formed by combining a communicating vessel principle and a siphon principle, so that the influence of random factors on measurement is reduced.

Description

Technical Field

[0001] The utility model relates to the field of measurement tests, and particularly relates to a BOD dilution and stabilization device. Background Art

[0002] When measuring the five-day biochemical oxygen demand (BOD5), the siphon method is used for sample dilution. The process is usually as follows: one end of a rubber hose is inserted into a container filled with the water sample to be taken, and the other end is sucked with an ear bulb. When the water sample flows out, it is transferred to another container for use. The following problems exist in the actual application of this method: the rubber hose is light and soft, so it is easy to shake and slip out of the container during use; when the water flow flows out and is transferred to the container, the water flow rate cannot be controlled and the hose cannot be immediately inserted into the bottom of the container, which causes bubbles to be generated during the dilution process and affects the dissolved oxygen content of the water sample; parallel samples cannot be made simultaneously, and the influence of random factors on the measurement cannot be effectively reduced. Content of the Utility Model

[0003] The main purpose of the utility model is to provide a BOD dilution and stabilization device to solve the problems in the above background art.

[0004] To solve the above technical problems, the technical solution adopted by the utility model is: it includes a base, on which a measuring cylinder and a column are provided. A three-way connecting pipe is fixedly provided on the column. The horizontal port of the three-way connecting pipe is connected to the measuring cylinder through a liquid suction soft catheter. Double-ball tubes are provided at the two vertical ports of the three-way connecting pipe, and the ends of the double-ball tubes are connected to a dissolved oxygen bottle through soft catheters.

[0005] Preferably, a sliding three-jaw chuck is provided on the column, and the three-jaw chuck is connected to the column through a cross clamp;

[0006] The three-jaw chuck is fixedly connected to the three-way connecting pipe.

[0007] Preferably, a valve is provided in the middle of the soft catheter.

[0008] Preferably, a groove is provided on the outside of the horizontal port of the three-way connecting pipe, and the end of the liquid suction soft catheter is sleeved on the groove and fixed by a clamp connection.

[0009] Preferably, an outer groove is provided at the end of the double-ball tube, and the end of the soft catheter is sleeved on the groove and fixed by a clamp connection.

[0010] Preferably, a weight tube is fixedly provided at the end of the liquid suction soft catheter, and the weight tube is located inside the measuring cylinder.

[0011] Preferably, a weight tube is fixedly provided at the end of the soft catheter, and the weight tube is located inside the dissolved oxygen bottle.

[0012] The utility model provides a BOD dilution and stabilization device, which solves the instability problem during the use of rubber hoses and is convenient to operate by adding a water flow guiding and regulating device and a stabilization device; it avoids the generation of bubbles during the dilution process; and by combining the principle of communicating vessels and the principle of siphon, parallel samples are formed simultaneously, reducing the influence of random factors on the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The following further describes the present utility model in conjunction with the drawings and embodiments:

[0014] Figure 1 is the front view of the overall structure connection of the present utility model;

[0015] In the figure: base 1; measuring cylinder 2; vertical column 3; three-way connecting pipe 4; three-jaw clamp 5; double-ball tube 6; liquid suction soft catheter 7; soft catheter 8; valve 9; dissolved oxygen bottle 10; counterweight pipe 11; cross clamp 12. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] As Figure 1 shown, a BOD dilution and stabilization device includes a base 1, on which a measuring cylinder 2 and a vertical column 3 are provided. A three-way connecting pipe 4 is fixedly provided on the vertical column 3. The horizontal port of the three-way connecting pipe 4 is communicated with the measuring cylinder 2 through a liquid suction soft catheter 7. Double-ball tubes 6 are provided at the two vertical ports of the three-way connecting pipe 4, and the ends of the double-ball tubes 6 are communicated with a dissolved oxygen bottle 10 through soft catheters 8. With this structure, the three-way connecting pipe 4 and the soft catheter 8 are connected through the double-ball tubes 6. The double-ball tubes are used to store a sufficient amount of water sample. First, the rubber bulb sucks air at the outlet end of the previous soft catheter 8, and siphon makes the connection end of the soft catheter 8 and the three-way connecting pipe 4 filled with water sample. This water sample can be used as a water seal to resist the gas fluctuation in the pipe and prevent gas from entering when the rubber bulb sucks air at the outlet end of the latter soft catheter 8; when the two valves 9 are opened, the water samples in the two soft catheters 8 and their connection ends with the three-way connecting pipe 4 flow into the corresponding dissolved oxygen bottles 10, forming a negative pressure around the soft catheters 8 and having a sealing effect. Under the action of atmospheric pressure, the water in the measuring cylinder 2 is more smoothly siphoned into the dissolved oxygen bottle 10.

[0017] Preferably, a sliding three-jaw clamp 5 is provided on the vertical column 3, and the three-jaw clamp 5 is connected to the vertical column 3 through a cross clamp 12;

[0018] The three-jaw clamp 5 is fixedly connected to the three-way connecting pipe 4. With this structure, the three-way connecting pipe 4 is installed on the vertical column 3 through the three-jaw clamp 5 and the cross clamp 12, and the height can be slidably adjusted to adapt to the height of the measuring cylinder 2.

[0019] Preferably, a valve 9 is provided in the middle of the soft catheter 8. With this structure, the valve 9 is used to control the on-off of the soft catheter 8. Connecting the valve 9 on the three-way connecting pipe 4 can realize the simultaneous preparation of parallel samples and avoid the generation of bubbles.

[0020] Preferably, a groove is provided on the outer side of the horizontal port of the three-way connecting pipe 4, and the end of the liquid suction flexible conduit 7 is sleeved on the groove and fixedly connected through a clamp. With this structure, the groove structure ensures a reliable connection and prevents the flexible hose from falling off.

[0021] Preferably, an outer groove is provided at the end of the double-ball pipe 6, and the end of the flexible conduit 8 is sleeved on the groove and fixedly connected through a clamp. With this structure, the groove structure ensures a reliable connection and prevents the flexible hose from falling off.

[0022] Preferably, a counterweight pipe 11 is fixedly provided at the end of the liquid suction flexible conduit 7, and the counterweight pipe 11 is located inside the measuring cylinder 2. With this structure, the end of the liquid suction flexible conduit 7 can be positioned below the liquid level through the counterweight pipe 11.

[0023] Preferably, a counterweight pipe 11 is fixedly provided at the end of the flexible conduit 8, and the counterweight pipe 11 is located inside the dissolved oxygen bottle 10.

[0024] One side of the base 1 of the iron stand is a high platform, which is used to increase the liquid level height difference between the measuring cylinder 2 and the dissolved oxygen bottle 10, and promote the smooth siphoning of the water sample in the measuring cylinder 2 into the dissolved oxygen bottle 10.

[0025] Test principle:

[0026] Place the measuring cylinder 2 containing the diluted water sample on the base 1 of the iron stand. After adjusting the cross clamp 12 to slide on the upright column 3 to a suitable height and fixing it, install the three-way connecting pipe 4 on the cross clamp 12 through the three-jaw clamp 5, and place the liquid suction flexible conduit 7 at one end of the three-way connecting pipe 4 into the measuring cylinder 2; open the first valve and close the second valve. Align the rubber suction bulb with the outlet of the first flexible conduit, suck it up and then take it away. If the water does not flow out, repeat this operation. When the water flows out normally, close the first valve and place the flexible conduit into the dissolved oxygen bottle 10; then open the second valve, and also use the rubber suction bulb to suck out the liquid by aligning it with the outlet of the second flexible conduit, and then close the second valve; open both valves 9, and the water sample flows out from the flexible conduits into the two dissolved oxygen bottles 10 respectively. After filling, close the valves.

[0027] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations to the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A BOD dilution and stabilization device, characterized in that: It includes a base (1), on which a measuring cylinder (2) and a vertical column (3) are provided. A three-way connecting pipe (4) is fixedly installed on the vertical column (3). The horizontal port of the three-way connecting pipe (4) is connected to the measuring cylinder (2) through a liquid suction flexible catheter (7). Double-ball pipes (6) are provided at the two vertical ports of the three-way connecting pipe (4), and the ends of the double-ball pipes (6) are connected to a dissolved oxygen bottle (10) through a flexible catheter (8).

2. The BOD dilution and stabilization device according to claim 1, wherein: A sliding three-jaw clamp (5) is provided on the vertical column (3), and the three-jaw clamp (5) is connected to the vertical column (3) through a cross clamp (12); The three-jaw clamp (5) is fixedly connected to the three-way connecting pipe (4).

3. The BOD dilution and stabilization device according to claim 1, characterized in that: A valve (9) is provided in the middle of the flexible catheter (8).

4. The BOD dilution and stabilization device according to claim 1, characterized in that: A groove is provided on the outside of the horizontal port of the three-way connecting pipe (4), and the end of the liquid suction flexible catheter (7) is sleeved on the groove and fixed by a clamp connection.

5. The BOD dilution and stabilization device according to claim 1, wherein: An outer groove is provided at the end of the double-ball pipe (6), and the end of the flexible catheter (8) is sleeved on the groove and fixed by a clamp connection.

6. The BOD dilution and stabilization device according to claim 1, characterized in that: A counterweight pipe (11) is fixedly installed at the end of the liquid suction flexible catheter (7), and the counterweight pipe (11) is located inside the measuring cylinder (2).

7. The BOD dilution and stabilization device according to claim 1, characterized in that: A counterweight pipe (11) is fixedly installed at the end of the flexible catheter (8), and the counterweight pipe (11) is located inside the dissolved oxygen bottle (10).

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