Novel azotometer

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By using a spherical buffer and steam cup in the fixed nitrogen instrument to achieve the air pressure balance of the steam process, the problem of steam inverted and bubble formation in the nitrogen instrument is solved, and the drip accuracy and the reliability of the instrument are improved.

CN222420122UActive Publication Date: 2025-01-28JINAN DUSHANG SCI INSTR CO LTD

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Patent Information

Application Number: CN202323658161.3
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2023-12-29
Publication Date: 2025-01-28
Estimated Expiration: 2033-12-29

AI Technical Summary

Technical Problem

The existing nitrogen fixing instruments are prone to inverting during the steam generation process, contaminating the steam in the steam cup, and bubbles appearing in the nitrogen-containing steam from the nitrogen fixing tube, affecting the titration accuracy.

Method used

A new type of nitrogen instrument is designed, which uses a spherical buffer tube and a steam cup. The steam is directly disintegrated in the tube through the steam catheter, and the steam valve and exhaust valve are controlled to make the steam cup and the elimination tube. , Buffer atmospheric balance to avoid suction.

Benefits of technology

Effectively avoid steam inverted and bubble formation, improve the precision of titration, and ensure the accuracy and reliability of the nitrogen instrument.

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Abstract

The utility model relates to a novel azotometer, including bracing frame, steam generation cup, azotometry tube, condenser tube, azotometry tube includes buffer tube, digestion tube, buffer tube top is provided with first interface, in the buffer tube is provided with steam conduit, the upper end of steam conduit is communicated with second interface, and the lower end of steam conduit is communicated with the condenser tube. The second connector is communicated with an air outlet of the steam generation cup through a pipeline, the side wall of the buffer pipe is provided with a third connector, a fourth connector and a fifth connector respectively, the third connector, the fourth connector and the fifth connector are communicated with an inner cavity of the buffer pipe, the third connector is connected with a pure water pump, the fourth connector is connected with an alkali liquor pump, and the alkali liquor pump is connected with an air outlet of the steam generation cup. And the fifth interface is connected with an acid liquid pump, and the acid liquid pump is connected with a container filled with an alkaline solution through a pipeline. According to the utility model, the condition of suck-back can be effectively avoided, the steam in the steam cup is prevented from being polluted, the nitrogen-containing steam from the nitrogen determination pipe is buffered by the spherical structure at the top of the buffer tank, bubbles are eliminated, and the titration precision is ensured.

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Description

Technical Field

[0001] The utility model relates to the technical field of experimental instruments, in particular to a novel nitrogen determination instrument. Background Art

[0002] The nitrogen analyzer is a special instrument for detecting the nitrogen content in seeds, dairy products, beverages, feed, soil and other agricultural and sideline products. It can calculate the protein content by measuring the nitrogen content in the sample based on the principle that the nitrogen content in protein is constant.

[0003] The basic principle followed by the current nitrogen analyzer is the Kjeldahl method, which is to heat and digest food with sulfuric acid and a catalyst to decompose protein. The decomposed ammonia combines with sulfuric acid to form ammonium sulfate, and then alkalize and distill to free ammonia. After absorbing it with boric acid, it is titrated with sulfuric acid or hydrochloric acid standard solution. The protein content is obtained by multiplying the acid consumption by the conversion factor. The steam of the commonly used nitrogen analyzer is prone to back-absorption, which pollutes the steam in the steam cup, and bubbles appear in the nitrogen-containing steam coming out of the nitrogen determination tube, affecting the titration accuracy. Summary of the invention

[0004] In order to overcome the above-mentioned shortcomings, the purpose of the utility model is to provide a novel nitrogen determination instrument.

[0005] The utility model solves the technical problem by adopting the following technical solution: a novel nitrogen determination instrument, comprising a support frame, a steam generating cup, a nitrogen determination tube, and a condenser; the nitrogen determination tube comprises a buffer tube and a digestion tube; the buffer tube is connected to the digestion tube through a rubber connecting pipe; a first interface is provided on the top of the buffer tube; the first interface is connected to the sample liquid inlet pipe of the condenser; a steam conduit is provided in the buffer tube; the upper end of the steam conduit is connected to the second interface; the lower end of the steam conduit is passed into the digestion tube; the second interface is connected to the gas outlet of the steam generating cup through a pipeline; An air intake valve is provided between the second interface and the steam generating cup, and a third interface, a fourth interface and a fifth interface are respectively provided on the side walls of the buffer tube, and the third interface, the fourth interface and the fifth interface are connected to the inner cavity of the buffer tube, the third interface is connected to the pure water pump, and the pure water pump is connected to the pure water adapter through a pipeline, the fourth interface is connected to the alkali liquid pump, and the alkali liquid pump is connected to the container containing the alkali solution through a pipeline, the fifth interface is connected to the acid liquid pump, and the acid liquid pump is connected to the container containing the alkali solution through a pipeline, and the sample liquid outlet pipe below the condenser is connected to the receiving bottle.

[0006] Specifically, the top of the buffer tube is configured as a spherical structure.

[0007] Specifically, the water inlet of the steam generating cup is connected to the water outlet of the liquid level switch, the water inlet of the liquid level switch is connected to the water outlet of the water replenishment pump, the water inlet of the water replenishment pump is connected to the water source through a pipeline, and a water replenishment valve is installed on the pipeline at the front end of the water replenishment pump.

[0008] Specifically, the bottom of the steam generating cup is connected to the drainage adapter through a pipeline.

[0009] Specifically, an exhaust port is also provided on the top of the steam generating cup, and a one-way exhaust valve is installed at the exhaust port.

[0010] Specifically, the condensate water inlet of the condenser is connected to the condensate water inlet pipe, the condensate water inlet pipe is connected to the condensate water source through an external condensate water circulation pump, or the condensate water inlet pipe is connected to the tap water source.

[0011] Specifically, a rear shell is provided at the rear of the support frame, a front shell is provided at the upper front side of the support frame, a tray is provided at the lower front side of the support frame, and a receiving and positioning device is provided on the tray.

[0012] Specifically, the buffer tube and the condenser tube are fixedly mounted on a support frame and are located in the front shell, and the digestion tube is detachably connected to the buffer tube.

[0013] Specifically, a clamping device is provided on the front side of the support frame.

[0014] Specifically, one side of the rear shell is provided with a condensate inlet adapter, a condensate outlet adapter, a water replenishment adapter, an alkali solution adapter, and an acid solution adapter, wherein:

[0015] The condensate water inlet pipe is connected to the condensate water inlet adapter, the condensate water outlet pipe is connected to the condensate water outlet adapter on the shell, and the water inlet of the water supply pump is connected to the water supply adapter through a pipeline;

[0016] The alkali solution pump is connected to the alkali solution adapter through a pipeline, the alkali solution adapter is connected to a container containing an alkali solution, and the acid solution pump is connected to the acid solution adapter through a pipeline.

[0017] Specifically, a pure water valve is installed on the pipeline at the water inlet end of the pure water pump, an alkali valve is installed on the pipeline at the liquid inlet end of the alkali pump, and an acid valve is installed on the pipeline at the liquid inlet end of the acid pump.

[0018] Specifically, it also includes a first position sensor, which is installed on the tray and placed at the receiving positioning device or inside the receiving positioning device, and is connected to the PLC controller.

[0019] Specifically, the clamping device includes a positioning side plate, a clamping plate, and a connecting rod. The front side of the support frame is provided with two mutually parallel positioning side plates. The inner side of the positioning side plate is installed with a clamping plate through a rotating shaft. The inner side of the clamping plate is provided with a gradually thickening step block. The step block is arranged around the rotating shaft and gradually thickens along its circumferential direction. A connecting rod is provided between the two clamping plates.

[0020] Specifically, a first positioning block is provided below the clamping device, a second limit sensor is provided inside the first positioning block, and the second limit sensor is connected to the PLC controller.

[0021] The beneficial effects of the utility model are as follows: the top of the buffer tube of the nitrogen determination instrument of the utility model is set as a spherical structure, and the steam generated by the steam generating cup is directly introduced into the digestion tube to perform thermal digestion on the substances in the digestion tube to decompose the protein, and the decomposed ammonia is combined with sulfuric acid to generate ammonium sulfate, and then the alkalized distilled gas passes through the buffer tube and enters the condenser tube, and the air pressure of the steam generating cup, the digestion tube and the buffer tube is balanced and controllable through the control of the air inlet valve and the exhaust valve, which can effectively avoid the situation of back suction and avoid contamination of the steam in the steam cup, and the nitrogen-containing steam coming out of the nitrogen determination tube is buffered by the spherical structure on the top of the buffer tank to eliminate bubbles and ensure the titration accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The structure of the utility model is shown in FIG. Figure 1 .

[0023] Figure 2 The structure of the utility model is shown in FIG. Figure 2 .

[0024] Figure 3 The internal structure of the utility model is shown in FIG. Figure 1 .

[0025] Figure 4 The internal structure of the utility model is shown in FIG. Figure 2 .

[0026] Figure 5 The circuit principle of the utility model Figure 1 .

[0027] Figure 6 The circuit principle of the utility model Figure 2 .

[0028] Figure 7 This is a schematic diagram of the structure of the clamping device of the utility model.

[0029] In the figure, 1 support frame, 101 rear shell, 102 front shell, 103 switch door, 104 tray, 105 receiving positioning device, 106 alkali solution adapter, 107 acid solution adapter, 108 condensate water inlet adapter, 109 condensate water outlet adapter, 1010 water supply adapter, 2 display screen, 3 buffer tube, 301 first interface, 302 second interface, 303 third interface, 304 fourth interface, 305 fifth interface, 4 condenser, 401 sample liquid inlet pipe, 402 condensate water inlet, 403 condensate water outlet, 404 sample liquid outlet pipe, 5 pure water pump, 6 receiving Bottle, 7 digestion tube, 701 positioning side plate, 7011 clamping plate, 7012 connecting rod, 7013 step block, 702 rubber pipe, 8 steam generating cup, 9 water supply valve, 10 water supply pump, 11 switching power supply, 12 PLC controller, 13 circulating water valve, 14 pure water valve, 15 acid valve, 16 alkali valve, 17 air intake valve, 18 liquid level switch, 19 first positioning block, 20 second positioning block, 21 third positioning block, 22 fourth fixing block, 23 fifth positioning block, 24 alkali pump, 25 acid pump, 26 heating rod, 27 first position sensor, 28 second position sensor. DETAILED DESCRIPTION

[0030] The utility model will now be further described in detail with reference to the accompanying drawings.

[0031] like Figure 1-7 A novel nitrogen determination instrument shown in the figure comprises a support frame 1, a steam generating cup 8, a nitrogen determination tube, and a condenser 4. The nitrogen determination tube comprises a buffer tube 3 and a digestion tube 7. The buffer tube 3 is connected to the digestion tube 3 through a rubber connecting pipe 702. A first interface 301 is provided on the top of the buffer tube 3. The first interface 301 is connected to the sample liquid inlet pipe 401 of the condenser 4. A steam conduit is provided in the buffer tube 3. The upper end of the steam conduit is connected to the second interface 302. The lower end of the steam conduit is passed into the digestion tube 7. The second interface 302 is connected to the air outlet of the steam generating cup 8 through a pipeline. An air inlet valve 17 is provided between the second interface 302 and the steam generating cup 8. A heating rod 26 in the steam generating cup 8 is energized to heat the water in the cup. The generated water vapor is directly passed into the digestion tube 7 through the steam conduit. The heating rod 26 is connected to a PLC controller, as shown in FIG. Figure 5As shown, the solvent in the digestion tube is heated, and the side walls of the buffer tube 3 are respectively provided with a third interface 303, a fourth interface 304, and a fifth interface 305, which are connected to the inner cavity of the buffer tube 3, and the third interface 303 is connected to the pure water pump 5, and the pure water pump 5 is connected to the pure water adapter 1011 through a pipeline. When in use, the pure water adapter 1011 is connected to a container containing pure water through a pipeline, and the fourth interface 304 is connected to the alkali solution pump 24, and the alkali solution The pump 24 is connected to a container containing an alkaline solution through a pipeline, and is used to add a corresponding reaction solution into the nitrogen determination cavity composed of the buffer tube 3 and the digestion tube 7. The fifth interface 305 is connected to the acid pump 25, and the acid pump 25 is connected to a container containing an alkaline solution through a pipeline, and is used to add a corresponding reaction solution into the nitrogen determination cavity composed of the buffer tube 3 and the digestion tube 7. The sample liquid outlet pipe 404 below the condenser 4 is connected to the receiving bottle 6, and the gas cooled by the condenser 4 enters the absorption liquid in the receiving bottle 6, and then titration is performed.

[0032] Specifically, the top of the buffer tube 3 is configured as a spherical structure.

[0033] Specifically, the water inlet of the steam generating cup 8 is connected with the water outlet of the liquid level switch 18, the water inlet of the liquid level switch 18 is connected with the water outlet of the water replenishment pump 10, and the water inlet of the water replenishment pump 10 is connected with the water source through a pipeline. For the convenience of control, a water replenishment valve 9 is installed on the pipeline at the front end of the water replenishment pump 10. The liquid level switch 18 can adopt a float type liquid level switch cup, which is the existing technology and the specific structure will not be repeated.

[0034] Specifically, the bottom of the steam generating cup 8 is connected to the drainage adapter 1011 through a pipeline for drainage. In order to facilitate the control of drainage, a drainage valve is installed on the pipeline between the steam generating cup 8 and the drainage adapter 1011.

[0035] Specifically, an exhaust port 801 is further provided at the top of the steam generating cup 8, and a one-way exhaust valve is installed at the exhaust port 801. When the air pressure in the steam generating cup 8 is too high, the air is exhausted to maintain the air pressure balance.

[0036] Specifically, the condensation water inlet 402 of the condenser tube 4 is connected to the condensation water inlet pipe, and the condensation water inlet pipe is connected to the condensation water source through an external condensation water circulation pump, or the condensation water inlet pipe is connected to the tap water source for condensation circulation, and the condensation water outlet 403 of the condenser tube 4 is connected to the condensation water outlet pipe for discharging water after the condensation circulation.

[0037] Specifically, a rear shell 101 is provided at the rear of the support frame 1, a front shell 102 is provided on the upper front side of the support frame 1, a tray 104 is provided at the front lower part of the support frame 1, a receiving positioning device 105 is provided on the tray 104, and a receiving bottle 6 is placed in the receiving positioning device 105. The receiving bottle 6 can be a variety of containers such as a conical bottle.

[0038] Specifically, the buffer tube 3 and the condenser tube 4 are fixedly mounted on the support frame 1 and are located in the front shell 102. The digestion tube 7 is detachably connected to the buffer tube 3. A switch door 103 is provided on the front shell 102 outside the digestion tube 7 for dust prevention.

[0039] Specifically, a clamping device is provided on the front side of the support frame 1 .

[0040] Specifically, one side of the rear housing 101 is provided with a condensate inlet adapter 108, a condensate outlet adapter 109, a water replenishment adapter 1010, an alkali solution adapter 106, and an acid solution adapter 107, wherein:

[0041] The condensate water inlet pipe is connected to the condensate water inlet adapter 107, the condensate water outlet pipe is connected to the condensate water outlet adapter 109 on the housing 1, and the water inlet of the water supply pump 10 is connected to the water supply adapter 1010 through a pipeline;

[0042] The alkali solution pump 24 is connected to the alkali solution adapter 106 through a pipeline, the alkali solution adapter 106 is connected to a container filled with alkali solution, and the acid solution pump 25 is connected to the acid solution adapter 107 through a pipeline, and the acid solution adapter 107 is connected to a container filled with alkali solution.

[0043] Specifically, a pure water valve 5 is installed on the pipeline at the water inlet end of the pure water pump 5, an alkali valve 14 is installed on the pipeline at the liquid inlet end of the alkali pump 24, and an acid valve 16 is installed on the pipeline at the liquid inlet end of the acid pump 25. When in use, start the corresponding valve first and then start the pump.

[0044] Specifically, it also includes a first position sensor 27 , which is installed on the tray 104 and placed at the receiving positioning device 105 or inside the receiving positioning device 105 , and is used to detect whether there is a receiving bottle 6 . The first position sensor 27 is connected to the PLC controller 12 .

[0045] Specifically, the PLC controller 12 is connected to the control power supply 11, and controls the start and stop of the pure water pump 5, the water supply pump 10, the alkali liquid pump 24, and the acid liquid pump 25, and controls the opening and closing of the water supply valve 9, the circulating water valve 13, the pure water valve 14, the alkali liquid valve 15, the acid liquid valve 16, and the gas valve 17. Figure 5 , Figure 6 As shown, a display screen 2 may be additionally provided according to the situation, and the PLC controller 12 is connected to the display screen 2 .

[0046] Specifically, the clamping device includes a positioning side plate 701, a clamping plate 7011, and a connecting rod 7012. Two mutually parallel positioning side plates 7011 are provided on the front side of the support frame. The inner side of the positioning side plate 7011 is installed with a clamping plate 7011 through a rotating shaft. The inner side of the clamping plate 7011 is provided with a gradually thickening step block 7013. The step block 7013 is arranged around the rotating shaft and gradually thickens along its circumferential direction. A connecting rod 7012 is provided between the two clamping plates 7011. After the digestion tube 7 is placed between the two clamping plates 7011, a force is applied to the connecting rod 7012 to rotate the clamping plate, rotate the step block, and gradually clamp the digestion tube 7 to achieve a fixing effect.

[0047] Specifically, a first positioning block 19 is provided below the clamping device, a second positioning block 20 and a third positioning block 21 are provided above the clamping device, a second limit sensor 20 is provided in the first positioning block 19, and the second limit sensor 28 is connected to the PLC controller 12 for detecting whether the digestion tube 7 is in place.

[0048] The present invention is not limited to the described implementation modes, and anyone should be aware of the structural changes made under the inspiration of the present invention. Any technical solutions that are the same or similar to the present invention fall within the protection scope of the present invention.

[0049] The technology, shape and structure parts not described in detail in the present invention are all known technologies.

Claims

1. A novel nitrogen determination instrument, comprising a support frame, a steam generating cup, a nitrogen determination tube, and a condenser tube, wherein the nitrogen determination tube comprises a buffer tube and a digestion tube, and is characterized in that: The buffer tube is connected to the digestion tube through a rubber tube, a first interface is provided on the top of the buffer tube, the first interface is connected to the sample liquid inlet pipe of the condenser, a steam conduit is provided in the buffer tube, the upper end of the steam conduit is connected to the second interface, the lower end of the steam conduit passes into the digestion tube, the second interface is connected to the air outlet of the steam generating cup through a pipeline, an air intake valve is provided between the second interface and the steam generating cup, a third interface, a fourth interface and a fifth interface are respectively provided on the side walls of the buffer tube, the third interface is connected to the pure water pump, the pure water pump is connected to the pure water adapter through a pipeline, the fourth interface is connected to the alkali liquid pump, the alkali liquid pump is connected to the container containing the alkali solution through a pipeline, the fifth interface is connected to the acid pump, the acid pump is connected to the container containing the alkali solution through a pipeline, and the sample liquid outlet pipe below the condenser is connected to the receiving bottle.

2. A novel nitrogen analyzer according to claim 1, characterized in that: The top of the buffer tube is configured as a spherical structure.

3. A novel nitrogen determination instrument according to claim 1, characterized in that: The water inlet of the steam generating cup is connected to the water outlet of the liquid level switch, the water inlet of the liquid level switch is connected to the water outlet of the water replenishment pump, the water inlet of the water replenishment pump is connected to the water source through a pipeline, and a water replenishment valve is installed on the pipeline at the front end of the water replenishment pump.

4. A novel nitrogen determination instrument according to claim 1, characterized in that: The top of the steam generating cup is also provided with an exhaust port, and a one-way exhaust valve is installed at the exhaust port.

5. A novel nitrogen analyzer according to claim 1, characterized in that: A rear shell is arranged at the rear of the support frame, a front shell is arranged above the front side of the support frame, a tray is arranged at the front lower part of the support frame, and a receiving and positioning device is arranged on the tray.

6. A novel nitrogen analyzer according to claim 1, characterized in that: The buffer tube and the condenser tube are fixedly mounted on the support frame and are located in the front shell body. The digestion tube is detachably connected to the buffer tube.

7. A novel nitrogen analyzer according to claim 1, characterized in that: A pure water valve is installed on the pipeline at the water inlet end of the pure water pump, an alkali valve is installed on the pipeline at the liquid inlet end of the alkali pump, and an acid valve is installed on the pipeline at the liquid inlet end of the acid pump.

8. A novel nitrogen analyzer according to claim 1, characterized in that: It also includes a first position sensor, which is installed on the tray and placed at the receiving positioning device or inside the receiving positioning device, and is connected to the PLC controller.

9. A novel nitrogen analyzer according to claim 1, characterized in that: A clamping device is provided on the front side of the support frame, and the clamping device includes a positioning side plate, a clamping plate, and a connecting rod. Two positioning side plates parallel to each other are provided on the front side of the support frame, and a clamping plate is installed on the inner side of the positioning side plate through a rotating shaft. A gradually thickening step block is provided on the inner side of the clamping plate. The step block is arranged around the rotating shaft and gradually thickens along its circumferential direction. A connecting rod is provided between the two clamping plates.

10. A novel nitrogen analyzer according to claim 9, characterized in that: A first positioning block is arranged below the clamping device, a second limit sensor is arranged inside the first positioning block, and the second limit sensor is connected to the PLC controller.