High-stability internal circulation flow path

Abstract

The utility model provides a high-stability internal circulation flow path which comprises a main loop, a first circulation branch and a second circulation branch, liquid in the main loop sequentially passes through a direct-current brushless magnetic drive pump, an ion exchanger and a pressure-stabilizing return pipe, a flow limiting column is arranged in the pressure-stabilizing return pipe, the two circulation branches are separated out through the pressure-stabilizing return pipe, and the first circulation branch and the second circulation branch are communicated through the flow limiting column. Due to the fact that the flow speed and the pressure of the liquid in the pressure stabilizing backflow pipe are stable, the pressure of the liquid flowing out of the pressure stabilizing backflow pipe to the circulation branch is also stable. During testing, the liquid flow is stable, the testing effect is more accurate, the internal flow speed of the liquid path is stable, the pressure loss of the pipeline is small, frequent liquid adding is not needed by adopting internal circulation, and microbial pollution is avoided.

Description

Technical Field

[0001] The utility model relates to the field of organic carbon testing, in particular to an internal circulation flow path with high stability. Background Art

[0002] When using liquid as a test carrier, it is particularly important to use an internal circulation flow path, which not only avoids the uncertainty interference of frequent use of new external input liquid, but also avoids the process of frequent liquid addition. The existing internal circulation flow path usually has problems such as unstable water flow and external microorganisms contaminating the water source, which can easily affect the accuracy of the test data. Summary of the invention

[0003] In order to solve the above problems of the prior art, the utility model provides a highly stable internal circulation flow path with a stable flow rate and flow rate, which can prevent contamination by external microorganisms.

[0004] The technical solutions adopted are as follows:

[0005] A highly stable internal circulation flow path includes a water tank for storing liquid and a main circuit, wherein the main circuit includes a magnetic pump for pumping liquid and an ion exchanger which are connected to the water tank in sequence through pipelines, and also includes a pressure-stabilizing reflux pipe which enters from one side, penetrates the water tank, and then passes out from the other side and flows back to the water tank again, wherein the pressure-stabilizing reflux pipe is connected to the ion exchanger pipeline, the outlet end height of the pressure-stabilizing reflux pipe is lower than the lowest scale of the liquid level inside the water tank, the pressure-stabilizing reflux pipe is located in the water tank to separate at least one circulation branch, and the circulation branch is connected to the water tank through a reflux port after passing through a detection component.

[0006] Furthermore, a flow-limiting column for adjusting the flow rate is provided in the pressure-stabilizing reflux pipe, and the inner diameter of the flow-limiting column is less than or equal to 1 / 2 of the inner diameter of the pressure-stabilizing reflux pipe.

[0007] Furthermore, the circulation branch includes a first circulation branch and a second circulation branch. The first circulation branch is connected to the water tank through a first reflux port after passing through the detection component, and the second circulation branch is connected to the water tank through a second reflux port after passing through the detection component.

[0008] Furthermore, the first reflux port and the second reflux port are at the same height, both being higher than the lowest mark of the liquid level inside the water tank.

[0009] Furthermore, the detection component includes a membrane filter, an electrode assembly and a two-way solenoid valve.

[0010] Furthermore, a first pipeline joint is provided between the first circulation branch and the pressure-stabilizing reflux pipe; and a second pipeline joint is provided between the second circulation branch and the pressure-stabilizing reflux pipe.

[0011] Furthermore, a first pipe joint is provided between the first circulation branch and the pressure-stabilizing reflux pipe; a second pipe joint is provided between the second circulation branch and the pressure-stabilizing reflux pipe, and the first pipe joint and the second pipe joint are both connected to the membrane filter, the electrode assembly, the two-way solenoid valve and the corresponding reflux port in sequence.

[0012] Furthermore, the water tank is provided with a water injection hole, and the water injection hole is sealed with rubber.

[0013] Furthermore, the water tank is provided with exhaust holes around the water injection hole.

[0014] Furthermore, the magnetic pump is a DC brushless magnetic pump.

[0015] Compared with the prior art, the beneficial effects produced by the utility model are:

[0016] The utility model provides a highly stable internal circulation flow path, including a main circuit, a first circulation branch and a second circulation branch. The main circuit liquid passes through a magnetic pump, an ion exchanger and a pressure-stabilizing reflux pipe in sequence. A flow-limiting column is provided in the pressure-stabilizing reflux pipe. The flow rate of the liquid in the main circuit is determined by adjusting the inner diameter of the magnetic pump and the flow-limiting column. The outlet end height of the pressure-stabilizing reflux pipe is constant and lower than the liquid level inside the water tank. The flow rate of the entire main circuit is stable, the pressure is stable, and the pipeline pressure loss is small. Two circulation branches can be set to be branched out by the pressure-stabilizing reflux pipe and returned to the reflux port through the test assembly. Since the flow rate and pressure of the liquid in the pressure-stabilizing reflux pipe are stable, the pressure flowing out from the pressure-stabilizing reflux pipe to the circulation branch is also stable. The liquid flow is stable during the test, and the test effect is more accurate. Two circulation branches are set to generate two sets of test data for comparison.

[0017] The water tank is also provided with a water injection hole and an exhaust hole. When the gas pressure in the liquid circuit reaches a certain value, the gas is discharged from the exhaust hole. The water tank is in a positive pressure state relative to the outside world, preventing external microorganisms from entering the water tank and reducing pollution to a certain extent. The internal circulation method does not require frequent liquid addition, reduces the operating steps, and is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a perspective view of the main circuit structure of the utility model;

[0019] Figure 2 for Figure 1 Enlarged view of point a;

[0020] Figure 3 for Figure 1 Enlarged view at b;

[0021] Figure 4 It is a top view of the overall structure of the utility model;

[0022] Figure 5 This is a perspective view of the water tank;

[0023] Figure 6 It is a rear view of the utility model;

[0024] Figure 7 It is a schematic diagram of the overall structure of the utility model;

[0025] Among them, a water tank 1, a first side 101, a second side 102, a DC brushless magnetic pump 2, an ion exchanger 3, a voltage-stabilizing reflux tube 4, a current limiting column 5, an outlet port 6, a minimum scale of the liquid level inside the water tank 7, a circulation branch 8, a first circulation branch 801, a second circulation branch 802, a detection component 9, a membrane filter 901, an electrode assembly 902, a two-way solenoid valve 903, a reflux port 10, a first reflux port 1001, a second reflux port 1002, a first pipe connector 11, a second pipe connector 12, a water injection hole 13, an exhaust hole 14, and a main circuit 15. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with specific embodiments.

[0027] refer to Figure 1-7 A highly stable internal circulation flow path includes a water tank 1 for storing liquid, a main circuit 15, the main circuit includes a magnetic pump 2 for pumping liquid and an ion exchanger 3 connected to the water tank 1 in sequence by pipelines, and also includes a pressure-stabilizing reflux pipe 4 that enters from one side and penetrates the water tank 1, then passes through the other side and flows back to the water tank again, the pressure-stabilizing reflux pipe 4 is connected to the ion exchanger 3 by pipeline, the outlet end 6 of the pressure-stabilizing reflux pipe 4 is lower than the lowest scale 7 of the liquid level inside the water tank, the pressure-stabilizing reflux pipe 4 is located in the water tank and divides at least one circulation branch 8, and the circulation branch 8 is connected to the water tank through the reflux port 10 after passing through the detection component 9.

[0028] The circulation branch 8 includes a first circulation branch 801 and a second circulation branch 802. The first circulation branch 801 passes through the detection component 9 and is connected to the water tank through the first return port 1001. The second circulation branch 802 passes through the detection component 9 and is connected to the water tank through the second return port 1002.

[0029] This embodiment includes three circulation loops. The liquid is pumped out from one side of the water tank, passes through the magnetic pump 2 and the ion exchanger 3 for pumping liquid in sequence through the pipeline, and then flows into the pressure-stabilizing reflux pipe 4 from the other side of the water tank to form a cycle, which is the main loop 15; two circulation branches are branched out from the pressure-stabilizing reflux pipe 4, namely the first circulation branch 801 and the second circulation branch 802.

[0030] The detection component 9 includes a membrane filter 901 , an electrode assembly 902 and a two-way solenoid valve 903 .

[0031] A first pipe joint 11 is provided between the first circulation branch 801 and the pressure-stabilizing reflux pipe 4; a second pipe joint 12 is provided between the second circulation branch 802 and the pressure-stabilizing reflux pipe 4. The first pipe joint 11 and the second pipe joint 12 are connected to the membrane filter 901, the motor assembly 902, the two-way solenoid valve 903 and the reflux port 10 in sequence.

[0032] Preferably, the magnetic pump 2 is a brushless DC magnetic pump, and the power source of the main circuit is a brushless DC magnetic pump, which has the advantages of high efficiency, low energy consumption, and quietness. The ion exchanger 3 is used to purify the water source and improve the purity of the water. The voltage-stabilizing reflux pipe 4 is provided with a current limiting column 5 for adjusting the flow rate. Preferably, the inner diameter of the current limiting column is ≤ 1 / 2 of the inner diameter of the voltage-stabilizing reflux pipe.

[0033] A flow limiting column is used as a throttling device to increase the pressure in the liquid circuit. The height of the outlet end 6 of the main circuit is lower than the lowest scale 7 of the liquid level inside the tank. The liquid level inside the water tank is a range. The outlet end 6 is lower than the lowest scale of the liquid level. In the overall internal circulation without leakage, the liquid capacity of the water tank remains unchanged, the height of the outlet end 6 of the main circuit remains unchanged, the back pressure of the outlet end 6 is always constant during circulation, and the pressure of the entire main circuit is stable. At the same time, as part of the main circuit, the pressure of the pressure-stabilizing reflux pipe 4 is constant, that is, the pressure of the first pipe joint 11 and the second pipe joint 12 branched from the pressure-stabilizing reflux pipe 4 is constant.

[0034] The first reflux port 1001 and the second reflux port 1002 are of the same height, both higher than the lowest mark 7 of the liquid level inside the water tank. The first and second reflux ports are of the same height and unchanged, that is, the pressure of the first and second reflux ports is constant. The pressure difference between the inlet (first pipe joint) and the outlet (first reflux port) of the first circulation branch 801 is constant, and the flow rate stability of the entire first circulation branch 801 is high. Similarly, the flow rate stability of the entire second circulation branch 802 is also high. At the same time, since the first and second reflux ports are of the same height and both are branched out from the pressure-stabilizing reflux pipe 4, the flow rate and flow rate of the first and second circulation branches are consistent.

[0035] The first and second circulation branches pass through the test assembly to test the organic carbon content of the liquid flowing through. The two branches are tested simultaneously to obtain two sets of data for comparison, making the test data more accurate. Since the flow rate is stable during the test, the accuracy of the test data is further guaranteed.

[0036] Furthermore, the water tank 1 is provided with a water injection hole 13, which is sealed with rubber. The water tank is also provided with an air vent 14 around the water injection hole.

[0037] During the first use, due to the presence of gas in the pipeline, the DC brushless magnetic pump 2 will produce pressure changes when pumping out the liquid in the water tank. Since the pipeline is not filled with liquid, part of the gas will be trapped and compressed, and there will be a negative pressure in the water tank relative to the outside. The gas dissolved in the water will precipitate. When it is pressurized again, the amount of gas dissolved will increase, making it easier to dissolve the gas into the liquid during the enrichment process.

[0038] In the subsequent use process, when the gas content in the water tank reaches the maximum value, the internal air pressure is high, and the gas will pass through the rubber and be discharged from the exhaust hole 14. The water tank is in a positive pressure state relative to the outside world, so that microorganisms in the air cannot enter the water tank through the small hole. The internal liquid path is not polluted, and the detection accuracy is high.

[0039] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A highly stable internal circulation flow path, comprising a water tank (1) for storing liquid, characterized in that: The invention comprises a main circuit (15), wherein the main circuit comprises a magnetic pump (2) for pumping liquid and an ion exchanger (3) which are connected to a water tank (1) in sequence through pipelines, and also comprises a pressure-stabilizing reflux pipe (4) which enters from one side and penetrates the water tank (1), then exits from the other side and flows back to the water tank again, wherein the pressure-stabilizing reflux pipe (4) is connected to the ion exchanger (3) through a pipeline, wherein the outlet end (6) of the pressure-stabilizing reflux pipe (4) is lower than the lowest scale (7) of the liquid level inside the water tank, wherein the pressure-stabilizing reflux pipe (4) is located inside the water tank and divides at least one circulation branch (8), wherein the circulation branch (8) is connected to the water tank through a reflux port (10) after passing through a detection component (9).

2. The highly stable internal circulation flow path according to claim 1, characterized in that: A flow-limiting column (5) for adjusting the flow rate is provided in the pressure-stabilizing reflux pipe (4), and the inner diameter of the flow-limiting column (5) is less than or equal to 1 / 2 of the inner diameter of the pressure-stabilizing reflux pipe (4).

3. The highly stable internal circulation flow path according to claim 1, characterized in that: The circulation branch (8) comprises a first circulation branch (801) and a second circulation branch (802); the first circulation branch (801) is connected to the water tank through a first return port (1001) after passing through the detection component (9); and the second circulation branch (802) is connected to the water tank through a second return port (1002) after passing through the detection component (9).

4. A highly stable internal circulation flow path as claimed in claim 3, characterized in that: The first reflux port (1001) and the second reflux port (1002) are at the same height, and are both higher than the lowest mark (7) on the liquid level inside the water tank.

5. The highly stable internal circulation flow path according to claim 1, characterized in that: The detection component (9) comprises a membrane filter (901), an electrode assembly (902) and a two-way solenoid valve (903).

6. The highly stable internal circulation flow path according to claim 3, characterized in that: A first pipeline joint (11) is provided between the first circulation branch (801) and the pressure-stabilizing reflux pipe (4); and a second pipeline joint (12) is provided between the second circulation branch (802) and the pressure-stabilizing reflux pipe (4).

7. The highly stable internal circulation flow path according to claim 3, characterized in that: A first pipeline joint (11) is provided between the first circulation branch (801) and the pressure-stabilizing reflux pipe (4); a second pipeline joint (12) is provided between the second circulation branch (802) and the pressure-stabilizing reflux pipe (4), and the first pipeline joint and the second pipeline joint are connected in sequence to the membrane filter (901), the electrode assembly (902), the two-way solenoid valve (903) and the corresponding reflux port (10) of the detection component (9).

8. The highly stable internal circulation flow path according to claim 1, characterized in that: The water tank (1) is provided with a water injection hole (13), and the water injection hole is sealed with rubber.

9. A highly stable internal circulation flow path as claimed in claim 8, characterized in that: The water tank is also provided with exhaust holes (14) around the water injection hole (13).

10. The highly stable internal circulation flow path according to claim 1, characterized in that: The magnetic pump (2) is a DC brushless magnetic pump.

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