Water-free full-automatic Kjeldahl apparatus

Abstract

The utility model provides a water-free full-automatic Kjeldahl apparatus. The water-free full-automatic Kjeldahl apparatus comprises a cabinet body, a nitrogen determination pipe, a liquid inlet and waste discharge mechanism, a fixing mechanism, a distillation mechanism, a condensation mechanism and a titration mechanism, the cabinet body is provided with a cavity, a first chamber, a second chamber and a third chamber, the cabinet body is provided with a first protective door, a second protective door and a third protective door, the first protective door movably covers the first chamber, the second protective door movably covers the second chamber, and the third protective door movably covers the third chamber; the nitrogen determination pipe and the fixing mechanism are both arranged in the first cavity, the liquid inlet and waste discharge mechanism and the condensation mechanism are both arranged in the cavity, the distillation mechanisms are respectively arranged in the first cavity, the third cavity and the cavity, and the titration mechanism is arranged in the second cavity. The device does not need to be externally connected with tap water to condense steam, reduces waste of water resources, automatically adds titration acid, determines a titration end point by judging the color of a titrated solution, and then automatically calculates the nitrogen content and the protein content according to the amount of digested titration acid.

Description

TECHNICAL FIELD

[0001] The utility model relates to experimental equipment technical field especially relates to a water -free full -automatic kjeldahl determination of nitrogen appearance. BACKGROUND

[0002] With the rapid development of economy of each region and the progress of science and technology, the fine detection demand of agricultural products is increasing, the quality control of raw materials and finished products of food industry is more and more strict, and the monitoring of nitrogen pollution in soil and water in the field of environmental protection is more and more valued, so a precise nitrogen content detection equipment is urgently needed, and kjeldahl determination of nitrogen appears.

[0003] The existing full -automatic kjeldahl determination of nitrogen basically adopts tap water condensation in the condensation step, therefore needs to consume a large amount of water resources, does not meet the water -saving requirement advocated by the country, and is greatly influenced by external environment, and when the temperature of water is too high in summer or the water pressure is low in water -shortage area, the condensation effect is poor, the detection result is influenced, and moreover, the existing water -free kjeldahl determination of nitrogen on the market is semi -automatic, needs manual titration and judgment of titration end point, not only increases the detection time, but also easily introduces artificial error. UTILITY MODEL CONTENTS

[0004] To solve the above -mentioned problems, the utility model adopts the following technical scheme: a water -free full -automatic kjeldahl determination of nitrogen, comprising: cabinet, nitrogen determination pipe, liquid inlet and waste discharge mechanism, fixing mechanism, distillation mechanism, condensation mechanism and titration mechanism;

[0005] The cabinet is provided with a cavity, a first chamber, a second chamber and a third chamber, and the cabinet is provided with a first protective door, a second protective door and a third protective door, the first protective door covers the first chamber, the second protective door covers the second chamber, and the third protective door covers the third chamber.

[0006] The nitrogen determination pipe and the fixing mechanism are arranged in the first chamber, the liquid inlet and waste discharge mechanism and the condensation mechanism are arranged in the cavity, the distillation mechanism is arranged in the first chamber, the third chamber and the cavity respectively, and the titration mechanism is arranged in the second chamber.

[0007] Further, the liquid inlet and waste discharge mechanism includes an interface assembly and a diaphragm pump, and the diaphragm pump is connected with an external solution bottle through the interface assembly.

[0008] Further, the fixing mechanism includes a presser and a pressing handle, the presser is used for pressing the nitrogen determination pipe, and the pressing handle is arranged on the presser.

[0009] Further, the distillation mechanism comprises a gas-liquid separation plug, a gas-liquid separation bottle, a steam solenoid valve, a steam generator assembly and a buffer bottle, the gas-liquid separation plug is used to seal the nitrogen-fixing tube, the gas-liquid separation bottle is used to add liquid to the nitrogen-fixing tube, the steam generator assembly is connected with the buffer bottle through the steam solenoid valve.

[0010] Further, the condensation mechanism comprises a compressor, a radiator assembly, a condensation titanium sleeve, a two-way valve, a filter, a fluorine needle valve and a capillary tube, the compressor is connected with the radiator assembly through a copper tube, the radiator assembly is connected with the filter and the capillary tube, the filter is connected with another branch of the capillary tube and the two-way valve, the other end of the capillary tube is connected with the condensation titanium sleeve, the condensation titanium sleeve is connected with the compressor through a copper tube, the fluorine needle valve is connected with the copper tube connected with the compressor, and the other end of the two-way valve is connected with the copper tube.

[0011] Further, the titration mechanism comprises a syringe pump, a titration acid liquid barrel, a shield, a receiving cup, a base, a rubber ring, a sensor, a light source, a motor, a stirring shaft and a cover, the titration acid liquid barrel is connected with the syringe pump, the receiving cup is placed on the base, the cover covers the receiving cup, the motor is arranged on the cover, the shield is arranged on the cover and covers the motor, the rubber ring is arranged on the cover and is connected with the receiving cup, the output shaft of the motor is connected with the stirring shaft, the stirring shaft is provided with a paddle, the paddle is located in the receiving cup, the shield, the rubber ring, the motor, the stirring shaft, the paddle and the cover are integrated and can be detached and separated from the receiving cup, the sensor and the light source are arranged in the interior of the base, and the light source faces the sensor.

[0012] Further, the shield can be detachably arranged on the side of the cover away from the receiving cup.

[0013] Further, the sensor is a color sensor.

[0014] Further, the light source is a white light source.

[0015] Further, a control system is further included, the control system has a touchable display screen, and the display screen is arranged on the counter.

[0016] The utility model discloses a beneficial effect is: use this water -free full -automatic kjeldahl determination nitrogen appearance, can not use external tap water to the steam condensation, greatly reduce the waste of water resources, and built -in has titration mechanism, can add titration acid automatically, and through the color judgment of the solution after titration to determine the titration end point, and then automatically according to the amount of digestion titration acid calculates the nitrogen content and protein content. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings further illustrate the utility model, but the embodiments in the drawings do not constitute any limitation to the utility model.

[0018] Figure 1 It is a direction schematic drawing of a water -free full -automatic kjeldahl determination nitrogen appearance provided for an embodiment;

[0019] Figure 2 It is another direction schematic drawing of a water -free full -automatic kjeldahl determination nitrogen appearance provided for an embodiment;

[0020] Figure 3 It is a direction schematic drawing of the internal structure of a water -free full -automatic kjeldahl determination nitrogen appearance provided for an embodiment;

[0021] Figure 4 It is another direction schematic drawing of the internal structure of a water -free full -automatic kjeldahl determination nitrogen appearance provided for an embodiment;

[0022] Figure 5 It is still another direction schematic drawing of the internal structure of a water -free full -automatic kjeldahl determination nitrogen appearance provided for an embodiment;

[0023] Figure 6 It is a direction connection schematic drawing of nitrogen determination pipe and gas -liquid separation bottle provided for an embodiment;

[0024] Figure 7 It is a direction schematic drawing of titration mechanism provided for an embodiment;

[0025] Figure 8 It is a direction schematic drawing of condensation mechanism provided for an embodiment. DETAILED DESCRIPTION

[0026] The technical scheme of the utility model will be further described below in conjunction with the drawings of the utility model embodiments, and the utility model is not limited to the following specific embodiments. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0027] As Figures 1 to 8The utility model discloses a kind of water-free full-automatic kjeldahl nitrogen determination apparatus, comprising: cabinet 13, nitrogen determination pipe 9, liquid inlet and waste discharge mechanism, fixing mechanism, distillation mechanism, condensing mechanism and titration mechanism;The cabinet 13 is opened with cavity, first chamber, second chamber and third chamber, and the cabinet 13 is provided with first protective door 1, second protective door 4 and third protective door 2, the first protective door 1 covers the first chamber, the second protective door 4 covers the second chamber, and the third protective door 2 covers the third chamber;The nitrogen determination pipe 9 and the fixing mechanism are both arranged in the first chamber, the liquid inlet and waste discharge mechanism and the condensing mechanism are both arranged in the cavity, the distillation mechanism is respectively arranged in the first chamber, the third chamber and the cavity, and the titration mechanism is arranged in the second chamber.

[0028] Specifically, the liquid inlet and waste discharge mechanism comprises an interface assembly 22 and a diaphragm pump 23, and the diaphragm pump 23 is connected with the external solution bottle through the interface assembly 22. Specifically, the number of diaphragm pumps 23 is specifically set according to the number of external solution bottles, and no redundant description is made in the embodiment. The fixing mechanism comprises a presser 7 for pressing the nitrogen-fixing pipe 9 and a pressing handle 8 arranged on the presser 7. The distillation mechanism comprises a gas-liquid separation rubber plug 11 for sealing the nitrogen-fixing pipe 9, a gas-liquid separation bottle 12 for adding liquid to the nitrogen-fixing pipe 9, a steam electromagnetic valve 19, a steam generator assembly 21 and a buffer bottle 25, and the steam generator assembly 21 is connected with the buffer bottle 25 through the steam electromagnetic valve 19. The condensation mechanism comprises a compressor 18, a heat sink assembly 20, a condensation titanium sleeve pipe 24, a two-way valve 33, a filter 34, a fluorine-added needle valve 35 and a capillary tube 36, the compressor 18 is connected with the heat sink assembly 20 through a copper pipe, the heat sink assembly 20 is connected with the capillary tube 36 through the filter 34, the filter 34 is connected with another branch of the capillary tube 36 and the two-way valve 33, the other end of the capillary tube 36 is connected with the condensation titanium sleeve pipe 24, the condensation titanium sleeve pipe 24 is connected with the compressor 18 through a copper pipe, the fluorine-added needle valve 35 and the condensation titanium sleeve pipe 24 are connected with the copper pipe connected with the compressor 18, and the other end of the two-way valve 33 is connected with the copper pipe. The titration mechanism comprises a syringe pump 10, a titration acid liquid barrel 14, a shield 15, a receiving cup 16, a base 17, a rubber ring 26, a sensor 27, a light source 28, a motor 32, a stirring shaft 30 and a cover 31, the titration acid liquid barrel 14 is connected with the syringe pump 10, the receiving cup 16 is placed on the base 17, the cover 31 covers the receiving cup 16, the motor 32 is arranged on the cover 31, the shield 15 is arranged on the cover 31 and covers the motor 32, the rubber ring 26 is arranged on the cover 31 and is connected with the receiving cup 16, the output shaft of the motor 32 is connected with the stirring shaft 30, the stirring shaft 30 is provided with a paddle 29 located in the receiving cup 16, the shield 15, the rubber ring 26, the motor 32, the stirring shaft 30, the paddle 29 and the cover 31 are integrated and can be detached from the receiving cup 16, the sensor 27 and the light source 28 are arranged inside the base 17, and the light source 28 faces the sensor 27. The shield 15 can be detachably arranged on the side of the cover 31 away from the receiving cup 16. The sensor 27 is a color sensor 27. The light source 28 is a white light source 28.

[0029] In the above embodiment, the water-free automatic Kjeldahl nitrogen determination apparatus further comprises a control system, wherein the control system has a touchable display screen 3, and the display screen 3 is arranged on the counter.

[0030] That is, using the water-free automatic Kjeldahl nitrogen determination apparatus, first, a certain amount of the to-be-tested liquid after digestion is sucked into the nitrogen determination tube 9, and then the nitrogen determination tube 9 is tightly sealed by the presser 7 and the gas-liquid separation plug 11. The press handle 8 is arranged to increase the force arm, thereby achieving the effect of saving labor. Through the operation of the staff on the display screen 3, the amount of dilution water, alkali and boracic acid solution mixed with indicator to be added is set, and then different diaphragm pumps 23 are started in sequence, and are connected to different external solution bottles through the joint of the interface assembly 22. The distilled water and the alkali are respectively drawn by different diaphragm pumps 23, and are then added into the nitrogen determination tube 9 through the gas-liquid separation bottle 12. The boracic acid solution with the indicator is drawn by another diaphragm pump 23, and is then delivered to the joint of the cover 31 along the pipeline, and the solution reaches the receiving cup 16 below the cover 31, and waits for the absorption of the condensed ammonia. At the same time, the motor 32 installed in the cover 31 and the shield 15 is started, and drives the stirring shaft 30 to rotate, so that the paddle 29 also rotates, thereby stirring the liquid in the receiving cup 16, and making the reaction sufficient.

[0031] Then, the heating wire in the steam generator assembly 21 is started, and the distilled water in the steam generator assembly 21 is boiled to generate steam. The steam is sent out from the opened steam electromagnetic valve 19, passes through the buffer bottle 25, reaches the right side of the gas-liquid separation bottle 12, enters the pagoda-shaped joint, reaches the bottom of the nitrogen determination tube 9, contacts the to-be-tested liquid with the added dilution water and alkali, and starts distillation to make ammonia free.

[0032] Next, the steam, carrying ammonia, flows upwards through the nitrogen-fixing tube 9, the gas-liquid separator stopper 11, and the gas-liquid separator bottle 12 to the condensing titanium sleeve 24. Subsequently, the high-temperature steam and ammonia enter from the horizontal joint above the spiral condensing titanium sleeve 24, condense into liquid along the inner tube of the condensing titanium sleeve 24, and then flow out from the horizontal joint below. Because the condensing titanium sleeve 24 has a double-layered tube-tube structure, with the refrigerant flowing through the outer tube and the high-temperature steam and ammonia flowing through the inner tube, the low-temperature refrigerant in the outer tube absorbs heat, causing the high-temperature steam and ammonia in the inner tube to cool down and condense. Furthermore, the compressor 18 transforms the refrigerant into a high-temperature, high-pressure gas. This high pressure forces the gas through copper pipes to the radiator assembly 20. Under the action of the radiator and fan, heat dissipation transforms the refrigerant from gas to liquid. It then flows through filter 34 and then through capillary tube 36. The copper pipe connecting capillary tube 36 and condensing titanium sleeve 24 has an inner diameter much larger than that of capillary tube 36, thus acting as an expansion valve. The high-pressure refrigerant initially sprays out as water mist. At this point, the refrigerant pressure drops and the temperature drops sharply. It then enters again through the outer pipe interface at the bottom of the condensing titanium sleeve 24, absorbing heat to cool the high-temperature vapor and ammonia gas inside the condensing titanium sleeve 24, thereby liquefying the vapor and ammonia gas, achieving a waterless condensation effect. After absorbing heat, the gaseous refrigerant returns to the compressor 18, and the cycle repeats through the compressor 18 to achieve the cooling effect. When the temperature of the condensing titanium sleeve 24 is too low, the inner tube may freeze, causing blockage and reducing refrigeration efficiency. In this case, the two-way valve 33 needs to be opened to allow some refrigerant to return directly to the compressor 18. The refrigerant charging needle valve 35 adds refrigerant to the waterless condensing mechanism. A back plate 5 and a side disassembly plate 6 are also provided, both used to cover the cavity.

[0033] Then, the steam and ammonia gas condense and liquefy, becoming distilled water and ammonia, which flow through the pipe to the side interface below the receiving cup 16. There, they are absorbed by the boric acid solution in the receiving cup 16. Because a mixing indicator is added to the boric acid solution, the boric acid solution changes color after absorbing ammonia. When illuminated by the white light source 28, the light passes through the solution and is detected by the color sensor 27, which reads the color to determine the solution's color. The base 17 serves to house the receiving cup 16, the color sensor 27, and the white light source 28, and also shields the color sensor 27 from external light interference.

[0034] Then, the syringe pump 10 starts to inject the titrating acid in the injector into the solution in the receiving cup 16 through the side interface below the receiving cup 16. The color sensor 27 determines whether the titration endpoint has been reached by judging the color. When the titration endpoint is reached, the syringe pump 10 stops dripping the titrating acid.

[0035] Finally, the nitrogen content is automatically calculated by reading the amount of titrating acid added by the syringe pump 10 and displayed on the display screen 3, thus completing the entire process of using the waterless fully automatic Kjeldahl nitrogen analyzer.

[0036] To sum up, the above-mentioned embodiments are not the limiting embodiments of the present application, and any modification or equivalent transformation made by those skilled in the art on the basis of the essential content of the present application is within the technical scope of the present application.

Claims

1. A water-free full-automatic Kjeldahl nitrogen determination apparatus, characterized by, The application relates to a nitrogen-determining cabinet. The cabinet body is provided with cavities, a first chamber, a second chamber and a third chamber, and is provided with a first protective door, a second protective door and a third protective door; the first protective door covers the first chamber, the second protective door covers the second chamber, and the third protective door covers the third chamber. The nitrogen-determining pipe and the fixing mechanism are arranged in the first chamber, the liquid inlet and waste discharge mechanism and the condensing mechanism are arranged in the cavities, and the distillation mechanism is arranged in the first chamber, the third chamber and the cavities respectively. The liquid inlet and waste discharge mechanism comprises an interface assembly and a diaphragm pump.

2. The water-free full-automatic Kjeldahl nitrogen determination apparatus according to claim 1, characterized in that: The fixing mechanism comprises a presser and a pressing handle.

3. The water-free full-automatic Kjeldahl nitrogen determination apparatus according to claim 1, characterized in that: The distillation mechanism comprises a gas-liquid separation rubber plug, a gas-liquid separation bottle, a steam electromagnetic valve, a steam generator assembly and a buffer bottle.

4. The water-free full-automatic Kjeldahl nitrogen determination apparatus according to claim 1, characterized in that: The condensing mechanism comprises a compressor, a radiator assembly, a condensing titanium sleeve, a two-way valve, a filter, a fluorine needle valve and a capillary tube.

5. The water-free full-automatic Kjeldahl nitrogen determination apparatus according to claim 1, characterized in that: The titration mechanism comprises a syringe pump, a titration acid liquid barrel, a shield, a receiving cup, a base, a rubber ring, a sensor, a light source, a motor, a stirring shaft and a cover; the titration acid liquid barrel is connected with the syringe pump; the receiving cup is placed on the base; the cover covers the receiving cup; the motor is arranged on the cover; the shield is arranged on the cover and covers the motor; the rubber ring is arranged on the cover and is connected with the receiving cup; the output shaft of the motor is connected with the stirring shaft; the stirring shaft is provided with a paddle; the paddle is located in the receiving cup; the shield, the rubber ring, the motor, the stirring shaft, the paddle and the cover are integrated and can be separated from the receiving cup; the sensor and the light source are arranged in the base; and the light source faces the sensor.

6. The water-free full-automatic Kjeldahl nitrogen determination apparatus according to claim 1, characterized in that: The shield is detachably arranged on the side of the cover away from the receiving cup.

7. The water-free full-automatic Kjeldahl nitrogen determination apparatus according to claim 6, characterized in that: The sensor is a color sensor.

8. The water-free full-automatic Kjeldahl nitrogen determination apparatus according to claim 7, characterized in that: The light source is a white light source.

9. The water-free full-automatic Kjeldahl nitrogen determination apparatus according to claim 8, characterized in that: The application further comprises a control system which is provided with a touchable display screen arranged on the cabinet body.

10. The water-free full-automatic Kjeldahl nitrogen determination apparatus according to claim 9, characterized in that: ​

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