A digestion apparatus for determining chemical oxygen demand

Abstract

The utility model discloses a kind of for determining chemical oxygen demand digestion device, including liquid pipeline module, pump, dosing tube, digestion tube, for fixing digestion tube digestion support, the side of digestion support is connected light source fixing part, and the other side is connected sensor fixing part.Liquid pipeline module is driven under the pump, after reagent is quantitatively volumed by dosing tube, it flows into digestion tube, and then sample liquid is extracted;Air is entered into digestion tube by air passage, heating wire in the inner chamber of digestion support is provided to provide temperature, high-pressure valve prevents high-temperature condition under which liquid in digestion tube leaks, digestion reaction starts;After reaching set time, heating wire stops working, fan starts to cool digestion tube, light source is opened, light is transmitted to sensor through liquid in digestion tube.The device uses an integrated structural member to replace complex pipeline connection, and the volume is greatly reduced by reasonable compact design, so that the use amount of reagent and sample is reduced, therefore waste liquid quantity after reaction is reduced, and use cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection testing, and in particular to a digestion device for determining chemical oxygen demand. Background Technology

[0002] Currently, commercially available online chemical oxygen demand (COD) analyzers are generally large in size, requiring significant amounts of reagents and samples, resulting in high wastewater output, high operating costs, and unsuitability for installation in confined spaces. Chinese invention application CN201010243373.3 discloses a device for automatically determining the COD of liquid samples. This device utilizes a pumping principle to achieve in-situ transport and removal of various liquids, avoiding frequent movement of digestion bottles and condensers, making it convenient to use and relatively simple in structure. However, this invention requires various input and output pipelines, making the structure still complex. Furthermore, the entry and exit of the same liquid require multiple pipelines and inlets / outlets, further complicating the operation. Therefore, there is still room for improvement.

[0003] Therefore, there is a need for a digestion device that has simple pipeline connections, can reduce volume through reasonable design to reduce the amount of waste liquid after the reaction, and has low operating costs. Utility Model Content

[0004] Purpose of the utility model: The purpose of this utility model is to provide a digestion device for determining chemical oxygen demand that is small in size and low in operating cost.

[0005] Technical Solution: The present invention relates to a digestion device for determining chemical oxygen demand, comprising a liquid pipeline module, a pump for driving the liquid in the liquid pipeline module to flow in the forward or reverse direction, a metering tube, and a digestion tube. The device is characterized in that, driven by the pump, the reagent flows into the digestion tube after a measured volume is obtained from the metering tube, and then a sample solution is drawn into the digestion tube to undergo a digestion reaction. The digestion tube is connected to a high-pressure valve to prevent leakage of liquid from the digestion tube during the digestion reaction. The digestion tube is fixedly installed inside the device via a digestion support.

[0006] Furthermore, the digestion support includes a central hole through which the digestion tube can pass, an upper adapter plate positioned above the digestion support, and a lower adapter plate positioned below the digestion support. The upper and lower adapter plates clamp the upper and lower ends of the digestion tube. There are two high-pressure valves: a first high-pressure valve is mounted on the upper adapter plate, and a second high-pressure valve is mounted on the lower adapter plate. The inner cavity of the digestion support also contains a heating wire for providing the temperature required for the digestion reaction and a temperature sensor that adjusts the output power of the heating wire in real time based on the temperature of the digestion tube.

[0007] Furthermore, one side of the digestion bracket is connected to a light source mounting bracket for mounting a light source, and the other side is connected to a sensor mounting bracket for mounting a sensor. The light source mounting bracket has a light source hole through which light from the light source can pass; the sensor mounting bracket has a corresponding sensor hole for receiving light from the light source.

[0008] Furthermore, the liquid pipeline module includes connectors and channels connecting the connectors and the metering tube, with the channels located on the valve baffle; the connectors include sample liquid connectors, reagent connectors, waste liquid connectors, and air intake connectors, and the channels include sample liquid channels, reagent channels, waste liquid channels, and air channels.

[0009] Beneficial effects: Compared with the prior art, the present invention has the following advantages: (1) It replaces the complex pipeline connection in the prior art with an integrated structural component. Through reasonable and compact design, the overall volume of the device is reduced, making it suitable for installation in small spaces; (2) Microfluidic liquid control reduces the amount of reagents and sample solutions used, lowers the cost of use, reduces the amount of waste liquid after reaction, and is environmentally friendly; (3) A high-pressure valve is adopted to prevent the leakage of high-pressure liquid in the digestion tube after heating, making it safer. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model;

[0011] Figure 2 This is a rear view of the present invention;

[0012] Figure 3 This is a side view of the present invention;

[0013] Figure 4 This is a schematic diagram of the digestion support structure in this utility model;

[0014] Figure 5 This is a schematic diagram of the upper adapter plate in this utility model;

[0015] Figure 6 This is a schematic diagram of the structure of the lower adapter plate in this utility model.

[0016] Figure 7 This is a schematic diagram of the structure of the light source fixing component in this utility model;

[0017] Figure 8 This is a schematic diagram of the sensor fixing component in this utility model. Detailed Implementation

[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0019] As shown in the figure, the digestion device of this utility model is assembled from multiple components, including a liquid pipeline module 1, a pump 2, a metering tube 3, a digestion tube 4, a first high-pressure valve 51, a second high-pressure valve 52, a digestion bracket 6, a light source fixing component 7, a sensor fixing component 8, a housing 9, and a rear cover 10. The housing 9 and the rear cover 10 together form a space to accommodate the internal components of the device. The housing 9 is made of corrosion-resistant metal such as 316L or titanium alloy, and is fixed by bending and welding or screws to ensure the structural strength requirements of the housing 9. The surface of the housing 9 is provided with multiple heat dissipation holes; the lower end of the housing 9 is connected to an aviation connector 91 for data transmission with the outside; the lower surface of the housing 9 is also provided with a positioning hole for the connector 11 in the liquid pipeline module 1 to pass through. The rear cover 10 is made of corrosion-resistant metal such as 316L or titanium alloy, and is provided with a mounting bracket 101 for quick installation and disassembly of the digestion device from other modules.

[0020] The liquid pipeline module 1 includes a connector 11, a connecting connector 11, a channel 12 for the metering tube 3, and a solenoid valve 13 for controlling the opening and closing of the channel 12. Both the channel 12 and the solenoid valve 13 are integrated onto a valve baffle 14. The connector 11 includes a sample liquid connector 111, a reagent connector 112, a waste liquid connector 113, and a gas path connector 114 for drawing air. The channel 12 includes a sample liquid channel 121, a reagent channel 122, a waste liquid channel 123, and a gas path channel 124. The connector 11 and the channel 12 are connected by a flexible hose. The pump 2 drives the liquid and gas in the liquid pipeline module 1 to flow bidirectionally, either forward or reverse. The reagent drawn through the liquid pipeline module 1 first passes through the metering tube 3 to measure its volume. The metering tube 3 can carry both liquid and gas and is made of materials such as quartz; other corrosion-resistant and strength-compliant materials are also acceptable. The metering tube 3 is fixed inside the device by a clip.

[0021] The digestion support 6 has a central hole 61 through which the digestion tube 4 can pass. The upper and lower ends of the digestion tube 4 are fixed by clamping them with an upper adapter plate 62 and a lower adapter plate 63, respectively. Figure 4 , Figure 5 , Figure 6As shown, the upper adapter plate 62 and the lower adapter plate 63 are similar in shape and are fixedly connected to the digestion support 6 through the upper mounting hole 601 and the lower mounting hole 602, respectively. The lower adapter plate 63 includes a lower flow path connector 632 that connects to the quantitative tube 3, and then connects to the digestion tube 4 and the second high-pressure valve 52 through the lower adapter plate flow channel 631. After the sample solution and reagent complete the digestion reaction in the digestion tube 4, they are connected to the pump 2 through the upper flow path connector 622 of the upper adapter plate 62. The pump works in reverse, and the driving force generated by the pump 2 enters the first high-pressure valve 51 and the digestion tube 4 along the upper adapter plate flow channel 621, causing the reaction liquid in the digestion tube 4 to be discharged from the waste liquid connector 113 along the waste liquid channel 123. The upper adapter plate 62 and the lower adapter plate 63 are respectively provided with a first groove 623 and a second groove 633, which can be used to install sealing rings to achieve a sealing effect. The inner cavity of the digestion support 6 is also equipped with a heating wire 64 for providing the temperature required for the digestion reaction, and a temperature sensor 65 for adjusting the output power of the heating wire in real time according to the temperature of the digestion tube 4.

[0022] The light source fixing component 7 is fixedly connected to the digestion bracket 6 via the light source fixing component mounting hole 603 on the digestion bracket 6. The other side of the digestion bracket 6 is connected to the sensor fixing component 8, which is fixed via the sensor fixing component mounting hole 604. The fan 66 is mounted on the digestion bracket 6 via the fan mounting hole 605. The digestion bracket 6 also has a fixing mounting hole 606, which is fixed to the housing 9 with screws. The left boss 75 of the light source fixing component 7 is inserted into a square hole on one side of the digestion bracket 6, and the right boss 76 of the sensor fixing component 8 is inserted into a square hole on the other side of the digestion bracket 6. The light source fixing component 7 includes a light source mounting hole 74 for mounting the light source 71. The light emitted by the light source 71 passes through the light source hole 72 and is received by the sensor 81 via the sensor hole 82 on the sensor fixing component 8. The sensor 81 is fixed to the sensor fixing component 8 via the sensor mounting hole 84. The light source fixing component 7 and the sensor fixing component 8 are respectively provided with a first height adjustment hole 73 and a second height adjustment hole 83, which can adjust the position height relative to the digestion bracket 6.

[0023] In the first step, pump 2 operates in the forward direction, the first high-pressure valve 51 and the second high-pressure valve 52 open, the solenoid valve connecting to the agent channel 122 opens, and the solenoid valves controlling other channels close. The agent is drawn in and passes through agent connector 112, hose, agent channel 122, solenoid valve 13, and enters the metering tube 3. Then, it passes through hose, lower flow path connector 632, second high-pressure valve 52, and lower adapter plate flow channel 631 into the digestion tube 4. Sensor 81 detects the change in the light source 71 and the metering agent volume. After reaching the target value, pump 2, the first high-pressure valve 51, the second high-pressure valve 52, and the solenoid valve connecting to the agent channel 122 close, and excess agent is discharged.

[0024] In the second step, pump 2 operates in the forward direction, opening the first high-pressure valve 51 and the second high-pressure valve 52, opening the solenoid valve connecting to sample channel 121, and closing the solenoid valves controlling other channels, thus drawing the sample. The sample flows through sample connector 111, hose, sample channel 121, solenoid valve 13, hose, lower flow path connector 632, second high-pressure valve 52, and lower adapter plate flow channel 631 into digestion tube 4. Sensor 81 detects the change in light source 71, quantifies the sample volume, and once the target value is reached, pump 2, the first high-pressure valve 51, the second high-pressure valve 52, and the solenoid valve connecting to sample channel 121 close, discharging excess sample.

[0025] Third, pump 2 operates in the forward direction, opening the first high-pressure valve 51 and the second high-pressure valve 52, opening the solenoid valve connecting to the gas passage 124, and closing the solenoid valves controlling other passages. The liquid in the digestion tube 4 will continuously bubble, achieving uniform mixing. Next, pump 2, the first high-pressure valve 51, the second high-pressure valve 52, and solenoid valve 13 stop operating, and heating wire 64 begins heating, initiating the digestion reaction in the liquid in the digestion tube 4. Temperature sensor 65 monitors the temperature of the digestion tube 4 and adjusts the output power of heating wire 64 in real time. After the set time is reached, heating wire 64 stops operating, and fan 66 turns on to cool the digestion tube 4. Fourth, when the temperature of the liquid in the digestion tube 4 drops to normal, light source 71 turns on, and light passes through the liquid in the digestion tube 4 to sensor 81. Sensor 81 receives the signal and transmits it to the data terminal via aviation connector 101 for analysis and data recording.

[0026] Fifth step, pump 2 reverses operation, the first high-pressure valve 51 and the second high-pressure valve 52 open, the solenoid valve connecting to the waste liquid channel 123 opens, the solenoid valve controlling other channels closes, the liquid in the digestion tube 4 is discharged together, the liquid is discharged through the second high-pressure valve 52, the lower adapter plate flow channel 631, the lower flow path connector 632, the hose, the waste liquid channel 123, the hose, and the waste liquid connector 113, and pump 2, the first high-pressure valve 51, the second high-pressure valve 52 and the solenoid valve 13 stop working.

[0027] This device employs chip-based experimental technology, ensuring stable pipeline flow and consistent test data. It boasts a fast response speed and accurate measurements, enabling remote calibration / verification. Its compact design significantly reduces the device's size, minimizing the amount of sample liquid and reagents fed in, thereby greatly reducing waste liquid volume. This not only makes it environmentally friendly but also lowers operating costs.

Claims

1. A digestion device for determining chemical oxygen demand, comprising a liquid pipeline module (1), a pump (2) for driving the liquid in the liquid pipeline module (1) to flow in a forward or reverse direction, a metering tube (3), and a digestion tube (4), characterized in that, Driven by the pump (2), the liquid pipeline module (1) receives a quantitative volume of the reagent through the metering tube (3) and then flows into the digestion tube (4). The sample liquid is then drawn into the digestion tube (4) to undergo a digestion reaction. The digestion tube (4) is connected to a high-pressure valve to prevent the liquid in the digestion tube (4) from leaking out during the digestion reaction. The digestion tube (4) is fixedly installed in the device by a digestion bracket (6).

2. The digestion apparatus according to claim 1, characterized in that, The digestion support (6) is provided with a central hole (61) through which the digestion tube (4) can pass, an upper adapter plate (62) above the digestion support (6) and a lower adapter plate (63) below the digestion support (6). The upper adapter plate (62) and the lower adapter plate (63) clamp the upper end and the lower end of the digestion tube (4).

3. The digestion apparatus according to claim 1, characterized in that, There are two high-pressure valves: the first high-pressure valve (51) is installed on the upper adapter plate (62), and the second high-pressure valve (52) is installed on the lower adapter plate (63).

4. The digestion apparatus according to claim 1, characterized in that, One side of the digestion bracket (6) is connected to a light source fixture (7) for mounting a light source, and the other side is connected to a sensor fixture (8) for mounting a sensor.

5. The digestion apparatus according to claim 4, characterized in that, The light source fixing component (7) is provided with a light source hole (71) through which light from the light source can pass; the sensor fixing component (8) is provided with a corresponding sensor hole (81) through which light from the light source can be received.

6. The digestion apparatus according to claim 1, characterized in that, The liquid pipeline module (1) includes a connector (11), a connecting connector (11) and a channel (12) for a metering tube (3), as well as a solenoid valve (13) for controlling the opening and closing of the channel (12). The channel (12) is located on a valve baffle (14). The connector (11) includes a sample liquid connector (111), a reagent connector (112), a waste liquid connector (113), and a gas path connector (114) for absorbing air. The channel (12) includes a sample liquid channel (121), a reagent channel (122), a waste liquid channel (123), and a gas path channel (124).

7. The digestion apparatus according to claim 1, characterized in that, The inner cavity of the digestion support (6) is also provided with a heating wire (64) for providing the temperature required for the digestion reaction and a temperature sensor (65) for adjusting the output power of the heating wire (64) in real time according to the temperature of the digestion tube (4).

Images