Centrifugal machine on-line oxygen content detection system and nitrogen protection device

Abstract

The invention discloses a centrifugal machine online oxygen content detection system and a nitrogen protection device, and relates to the technical field of centrifugal machine oxygen content detection and nitrogen protection. The small nitrogen valve assembly and the large nitrogen valve assembly are the same in structure, and the difference is that the cross section area of a nitrogen inlet of the large nitrogen valve assembly is twice that of a nitrogen inlet of the small nitrogen valve assembly; each nitrogen valve assembly comprises a mounting frame welded to the outer wall of the centrifugal machine body, one end of each mounting frame penetrates through the outer wall of the centrifugal machine body to an inner cavity of the centrifugal machine body, a mounting groove is formed in one side of each mounting frame, and a valve plate is movably mounted in each mounting groove. The nitrogen injection amount can be accurately controlled in a nitrogen protection mode, the nitrogen injection amount is controlled by controlling the temperature, the nitrogen consumption cost is reduced, nitrogen protection operation is conducted through the double nitrogen valve assemblies, the oxygen content danger upper limit in the centrifugal machine is greatly improved, and the service life of the centrifugal machine is prolonged. And the oxygen content in the centrifugal machine can be rapidly controlled.

Description

Technical Field

[0001] The invention belongs to the technical field of centrifuge oxygen content detection and nitrogen protection, and in particular relates to an online centrifuge oxygen content detection system and a nitrogen protection device. Background Art

[0002] As a general filtering and separation equipment, centrifuges are widely used in industries such as fertilizers, chemicals, oil refining, pharmaceuticals, food and national defense. Since centrifuges process a wide variety of materials, and many of them are flammable and explosive materials (such as toluene, acetone, ethanol and other organic solvents), the possibility of causing combustion and explosion accidents is relatively high. At the same time, due to its extremely high speed, it is easy to generate and accumulate static electricity when rotating at high speed, which can easily cause combustion and explosion accidents when encountering combustible materials and suitable environmental conditions; if the operation is careless or illegal, it will come into contact with the materials in the rotating centrifuge drum, which can easily cause personal injury accidents such as finger and arm amputation. Therefore, the internal oxygen concentration of the centrifuge during operation becomes the primary safety issue of concern.

[0003] At present, the oxygen content of the centrifuge is detected when it is working by an oxygen sensor installed inside the centrifuge. The nitrogen valve is opened according to the measured oxygen content data, and nitrogen is injected into the centrifuge for protection. In fact, most centrifuge nitrogen protection devices only have a nitrogen inlet pipe and a nitrogen outlet pipe on the casing. When the centrifuge is working, the inner cavity is filled with nitrogen. There is no quantitative control as to whether the nitrogen concentration can reach the safety range, so the reliability of nitrogen protection is very poor.

[0004] The existing centrifuge oxygen content detection system and nitrogen protection device cannot be combined with each other to accurately measure the oxygen content inside the centrifuge when it is working, and the injection amount of nitrogen cannot be quantitatively controlled. For this reason, we propose an online centrifuge oxygen content detection system and nitrogen protection device. Summary of the invention

[0005] The purpose of the present invention is to provide an online oxygen content detection system and a nitrogen protection device for a centrifuge, so as to solve the problem that the existing centrifuge oxygen content detection system and the nitrogen protection device cannot be combined with each other to accurately measure the oxygen content inside the centrifuge when it is working, and the injection amount of nitrogen cannot be quantitatively controlled.

[0006] To solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a centrifuge nitrogen protection device, comprising a zirconia oxygen analyzer, a small nitrogen valve assembly and a large nitrogen valve assembly arranged on the outer surface of the centrifuge body, wherein the zirconia oxygen analyzer and the two nitrogen valve assemblies are connected via a heating assembly; a gas sampling pump at one end of the zirconia oxygen analyzer penetrates the outer wall of the centrifuge body to its inner cavity; The small nitrogen valve assembly has the same structure as the large nitrogen valve assembly, except that the cross-sectional area of ​​the nitrogen inlet of the large nitrogen valve assembly is twice that of the nitrogen inlet of the small nitrogen valve assembly; both nitrogen valve assemblies include a mounting frame, the mounting frame is welded to the outer wall of the centrifuge body, and one end thereof penetrates the outer wall of the centrifuge body to its inner cavity, a mounting groove is provided on one side of the mounting frame, a valve plate is movably installed inside the mounting groove, a circular hole is provided inside the valve plate, a connecting rod penetrates inside the circular hole, one end of the connecting rod is fixedly connected to the inner wall of one side of the mounting frame, and a spring is sleeved on the peripheral side of the connecting rod, and one end of the spring is fixedly connected to the inner wall of one end of the circular hole; the outer wall of one side of the mounting frame is fixedly connected to the electromagnet; a movable magnet is fixedly connected to the side of the valve plate adjacent to the electromagnet.

[0007] Preferably, the electromagnets of the zirconium oxide oxygen analyzer and the two nitrogen valve assemblies are respectively provided with mounting holes, a copper tube passes through the three mounting holes respectively, and a coil is sleeved on the side surface of the copper tube.

[0008] Preferably, the zirconia oxide oxygen analyzer uses a gas sampling pump to mix the nitrogen entering the inner cavity of the centrifuge with air and then sucks the gas into the inner cavity sensor of the zirconia oxide oxygen analyzer to detect the oxygen content inside the centrifuge. The zirconia oxide oxygen analyzer is within the operating range temperature. The higher the temperature, the more accurate the oxygen content measurement.

[0009] Preferably, the other end of the connecting rod is fixedly connected to the side of the fixed plate, and the fixed plate is fixedly connected to the outer side of the centrifuge body; the side of the fixed plate is fixedly connected to the other end of the spring; the electromagnets of the two nitrogen valve assemblies are fixedly connected to one side of the power supply and are electrically connected to the power supply, and the power supply is fixedly connected to the centrifuge body.

[0010] An online oxygen content detection system for a centrifuge includes a processing module, and a temperature control module, a collection module, and a decision module that are respectively connected to the processing module in communication with the processing module; Processing module: used to provide a centralized interface for the system administrator of the oxygen detection system to configure and maintain the various functions of the system. It is also used to manage the operation of each module of the oxygen detection system and summarize the operation data of each module and display it on the centralized interface; Temperature control module: used to control the heating temperature of the heating component to achieve the working temperature range of the zirconia oxygen analyzer and the demagnetization temperature range of the electromagnet; the working temperature range of the zirconia oxygen analyzer is 600-850℃, the demagnetization temperature range of the electromagnet in the small nitrogen valve assembly is 600-700℃, and the demagnetization temperature range of the electromagnet in the large nitrogen valve assembly is 700-850℃; Acquisition monitoring module: used to control the zirconia oxygen analyzer to collect the oxygen content in the centrifuge body cavity in real time when it is working; and output the collected real-time oxygen content data to the decision-making module; Decision module: used to receive the collected real-time oxygen content, and issue corresponding decision commands to the operation module according to the decision plan and the real-time oxygen content. The decision plan includes the following contents: when the real-time working oxygen content in the centrifuge cavity is lower than 6%, the centrifuge is started. At this time, the heating temperature of the heating component is 600°C, reaching the working temperature of the zirconia oxygen analyzer, and the electromagnet in the small nitrogen valve assembly reaches the minimum value of the demagnetization temperature range, and the small nitrogen valve assembly is opened to inject nitrogen into the centrifuge cavity; when the real-time working oxygen content in the centrifuge cavity is higher than 8%, the heating temperature of the heating component is increased to above 700°C, and the two nitrogen valve assemblies are opened to inject nitrogen into the centrifuge cavity; when the two nitrogen valve assemblies are fully opened to inject nitrogen into the centrifuge for a period of time, the oxygen content continues to rise and exceeds 10%, the centrifuge is stopped.

[0011] Preferably, the zirconia oxygen analyzer uses a zirconia solid electrolyte with a certain proportion of yttrium trioxide stabilizer added as the core element and platinum material as the electrode. It is designed by utilizing the oxygen ion conductivity of zirconia in an environment above 650°C. When there is a difference in oxygen concentration on both sides of the zirconia, under the catalysis of the platinum electrode, the oxygen molecules near the wall obtain electrons to generate oxygen ions. The side with high oxygen ion concentration diffuses to the side with low concentration through the oxygen ion vacancies inside the zirconia material, releases electrons on the low concentration side and combines with oxygen ions to precipitate oxygen molecules; the high oxygen side is positively charged due to the loss of electrons, and the low oxygen side is negatively charged due to the release of electrons. The accumulation of positive and negative charges forms an electromotive force. The relationship between the electromotive force and the oxygen concentration difference on both sides conforms to the Nernst equation; the zirconia oxygen analyzer calculates the oxygen content in the sample gas according to the Nernst equation, as shown in formula (1): (1) Where: E is the output electromotive force, R is the gas constant; T is the working temperature of zirconia; K is the correction coefficient; F is the Faraday constant; is the oxygen content of the reference gas; P is the oxygen content in the sample gas.

[0012] Preferably, the decision scheme in the decision module also includes the following specific contents: when the real-time working oxygen content in the centrifuge cavity is lower than 6%, the heating temperature of the heating component is 600°C; when the real-time working oxygen content in the centrifuge cavity exceeds 6%, the heating temperature of the heating component increases by 10°C for every 0.2% increase; when the oxygen content reaches 8%, the small nitrogen valve assembly is fully opened to inject nitrogen into the centrifuge cavity; when the real-time working oxygen content in the centrifuge cavity exceeds 8%, the heating temperature of the heating component increases by 15°C for every 0.2% increase; when the oxygen content reaches 10%, the large nitrogen valve assembly is fully opened to inject nitrogen into the centrifuge cavity.

[0013] Preferably, after the centrifuge is started, the acquisition monitoring module extracts sample gas from the inner cavity of the centrifuge into the inner cavity of the zirconium oxide analyzer through a gas sampling pump every 10 minutes to perform online oxygen content detection.

[0014] Preferably, the online oxygen content detection system further includes an alarm module and a storage module; Alarm module: used to sound an alarm when the oxygen content in the centrifuge cavity exceeds 10%, and automatically stop the centrifuge; Storage module: used to store the real-time oxygen content data of the inner cavity when the centrifuge is working, and for the administrator to review.

[0015] The present invention has the following beneficial effects: The present invention sets a heating component, which is composed of a copper tube and a coil and passes through a zirconia oxygen analyzer, a small nitrogen valve component and a large nitrogen valve component in sequence. When the heating component is heated to 600°C, the working temperature of the zirconia oxygen analyzer is just reached. At this time, the oxygen content of the gas in the inner cavity of the centrifuge is detected by the zirconia oxygen analyzer. At the same time, the electromagnet in the small nitrogen valve component just reaches the lowest value of the demagnetization temperature range at 600°C. At this time, the temperature continues to rise, and the electromagnet in the small nitrogen valve component is continuously demagnetized until the Curie temperature is reached and the electromagnet is completely demagnetized. Because the Curie temperatures of different types of electromagnets are also different, the types of electromagnets in the small nitrogen valve component and the large nitrogen valve component are distinguished. The Curie temperature of the electromagnet in the small nitrogen valve component is lower than the Curie temperature of the electromagnet in the large nitrogen valve component, so that the opening and closing of the two valve components are controlled according to the different temperatures. When the temperature is below 600°C, the zirconia oxygen analyzer and the two nitrogen valve components do not work. When the temperature is between 600 and 700 °C, the zirconia oxygen analyzer starts to work, and the electromagnet in the small nitrogen valve assembly gradually loses its magnetism and gradually loses its attraction to the active magnet, so that the valve plate with the active magnet fixed on one side is pulled by the spring to slide outside the installation frame during the elastic reset process of the spring, so that nitrogen enters the inner cavity of the centrifuge from the installation frame. When the temperature is between 700 and 850 °C, not only does the electromagnet in the small nitrogen valve assembly completely lose its magnetism, the small nitrogen valve assembly is fully opened to inject nitrogen into the centrifuge, but the electromagnet in the large nitrogen valve assembly also gradually loses its magnetism, and the large nitrogen valve assembly also gradually opens to inject nitrogen into the inner cavity of the centrifuge. This nitrogen protection method can accurately control the amount of nitrogen injected, and control the amount of nitrogen injected by controlling the temperature, reducing the nitrogen consumption cost, and using the double nitrogen valve assembly to perform nitrogen protection operations, greatly increasing the dangerous upper limit of the oxygen content inside the centrifuge, and being able to quickly control the oxygen content inside the centrifuge.

[0016] The invention provides an oxygen content detection system and controls the working temperature of the zirconium oxide analyzer and two groups of nitrogen valve components through a temperature control module, thereby controlling the injection of nitrogen when the centrifuge is working. When the temperature is maintained at 600-700°C, the small nitrogen valve component starts to work to inject nitrogen into the inside. The higher the temperature, the higher the detection accuracy of the zirconium oxide analyzer. When the oxygen content exceeds 8%, the temperature is controlled at 700-850°C. At this time, the two nitrogen valve components are started at the same time to increase the injection amount of nitrogen, thereby ensuring that the oxygen content inside the centrifuge is less than 10%, thereby maintaining the working safety of the centrifuge. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the overall structure of the centrifuge nitrogen protection device provided by the present invention; Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 3 A schematic cross-sectional view of the structure of a first nitrogen valve assembly of a centrifuge nitrogen protection device provided by the present invention.

[0019] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Centrifuge body; 2. Coil; 3. Copper tube; 4. Fixed plate; 5. Connecting rod; 6. Spring; 7. Mounting frame; 8. Valve plate; 9. Movable magnet; 10. Electromagnet; 12. Power supply; 13. Zirconia oxygen analyzer. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0021] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] See also Figure 1-3The present invention is a centrifuge nitrogen protection device, comprising a zirconia oxygen analyzer 13, a small nitrogen valve assembly and a large nitrogen valve assembly arranged on the outer surface of a centrifuge body 1, the zirconia oxygen analyzer 13 and the two nitrogen valve assemblies are connected by a heating assembly; a gas sampling pump at one end of the zirconia oxygen analyzer 13 penetrates the outer wall of the centrifuge body 1 to its inner cavity; the heating assembly should be electrically connected to a power supply device to power the heating assembly, which is not described in detail in the present invention.

[0024] The small nitrogen valve assembly has the same structure as the large nitrogen valve assembly, except that the cross-sectional area of ​​the nitrogen inlet of the large nitrogen valve assembly is twice that of the nitrogen inlet of the small nitrogen valve assembly; both nitrogen valve assemblies include a mounting frame 7, which is welded to the outer wall of the centrifuge body 1, and one end of which penetrates the outer wall of the centrifuge body 1 to its inner cavity, a mounting groove is provided on one side of the mounting frame 7, a valve plate 8 is movably installed inside the mounting groove, a circular hole is provided inside the valve plate 8, a connecting rod 5 penetrates inside the circular hole, one end of the connecting rod 5 is fixedly connected to the inner wall of one side of the mounting frame 7, and a spring 6 is sleeved on the side surface of the connecting rod 5, and one end of the spring 6 is fixedly connected to the inner wall of one end of the circular hole; the outer wall of one side of the mounting frame 7 is fixedly connected to the electromagnet 10; a movable magnet 9 is fixedly connected to the side of the valve plate 8 adjacent to the electromagnet 10.

[0025] The zirconia oxygen analyzer 13 and the electromagnets 10 of the two nitrogen valve assemblies are respectively provided with mounting holes, a copper tube 3 passes through the three mounting holes respectively, and a coil 2 is sleeved on the side surface of the copper tube 3 .

[0026] Among them, the zirconia oxide oxygen analyzer 13 uses a gas sampling pump to mix the nitrogen entering the inner cavity of the centrifuge with air, and then inhales the gas into the inner cavity sensor of the zirconia oxide oxygen analyzer 13 to detect the oxygen content inside the centrifuge. The zirconia oxide oxygen analyzer 13 is within the working range temperature. The higher the temperature, the more accurate the oxygen content measurement.

[0027] Among them, the other end of the connecting rod 5 is fixedly connected to the side of the fixed plate 4, and the fixed plate 4 is fixedly connected to the outer side of the centrifuge body 1; the side of the fixed plate 4 is fixedly connected to the other end of the spring 6; the electromagnets 10 of the two nitrogen valve assemblies are fixedly connected to one side of the power supply 12 and are electrically connected to the power supply 12, and the power supply 12 is fixedly connected to the centrifuge body 1.

[0028] An online oxygen content detection system for a centrifuge includes a processing module, and a temperature control module, a collection module, and a decision module that are respectively connected to the processing module in communication with the processing module; Processing module: used to provide a centralized interface for the system administrator of the oxygen detection system to configure and maintain the various functions of the system. It is also used to manage the operation of each module of the oxygen detection system and summarize the operation data of each module and display it on the centralized interface; Temperature control module: used to control the heating temperature of the heating component so as to reach the working temperature range of the zirconium oxide oxygen analyzer 13 and the demagnetization temperature range of the electromagnet 10; wherein the working temperature range of the zirconium oxide oxygen analyzer 13 is 600-850°C, the demagnetization temperature range of the electromagnet 10 in the small nitrogen valve assembly is 600-700°C, and the demagnetization temperature range of the electromagnet 10 in the large nitrogen valve assembly is 700-850°C; The acquisition monitoring module is used to control the zirconium oxide oxygen analyzer 13 in real time to collect the oxygen content in the inner cavity of the centrifuge body 1 when it is working; and output the collected real-time oxygen content data to the decision module; Decision module: used to receive the collected real-time oxygen content, and issue corresponding decision commands to the operation module according to the decision plan and the real-time oxygen content. The decision plan includes the following contents: when the real-time working oxygen content in the centrifuge cavity is lower than 6%, the centrifuge is started. At this time, the heating temperature of the heating component is 600°C, reaching the working temperature of the zirconium oxide oxygen analyzer 13, and the electromagnet 10 in the small nitrogen valve assembly reaches the minimum value of the demagnetization temperature range, and the small nitrogen valve assembly is opened to inject nitrogen into the centrifuge cavity; when the real-time working oxygen content in the centrifuge cavity is higher than 8%, the heating temperature of the heating component is increased to above 700°C, and the two nitrogen valve assemblies are opened to inject nitrogen into the centrifuge cavity; when the two nitrogen valve assemblies are fully opened to inject nitrogen into the centrifuge for a period of time, the oxygen content continues to rise and exceeds 10%, the centrifuge is stopped.

[0029] Among them, the zirconia oxygen analyzer 13 uses a zirconia solid electrolyte with a certain proportion of yttrium trioxide stabilizer added as the core component and platinum material as the electrode. It is designed by utilizing the oxygen ion conductivity of zirconia in an environment above 650°C. When there is an oxygen concentration difference on both sides of the zirconia, under the catalysis of the platinum electrode, the oxygen molecules near the wall obtain electrons to generate oxygen ions. The side with high oxygen ion concentration diffuses to the side with low concentration through the oxygen ion vacancies inside the zirconia material, releases electrons on the low concentration side and combines with oxygen ions to precipitate oxygen molecules; the high oxygen side is positively charged due to the loss of electrons, and the low oxygen side is negatively charged due to the release of electrons. The accumulation of positive and negative charges forms an electromotive force. The relationship between the electromotive force and the oxygen concentration difference on both sides conforms to the Nernst equation; the zirconia oxygen analyzer 13 calculates the oxygen content in the sample gas according to the Nernst equation, as shown in formula (1): (1) Where: E is the output electromotive force, R is the gas constant; T is the working temperature of zirconia; K is the correction coefficient; F is the Faraday constant; is the oxygen content of the reference gas; P is the oxygen content in the sample gas.

[0030] Among them, the decision plan in the decision module also includes the following specific contents: when the real-time working oxygen content in the centrifuge cavity is lower than 6%, the heating temperature of the heating component is 600°C; when the real-time working oxygen content in the centrifuge cavity exceeds 6%, the heating temperature of the heating component increases by 10°C for every 0.2% increase; when the oxygen content reaches 8%, the small nitrogen valve assembly is fully opened to inject nitrogen into the centrifuge cavity; when the real-time working oxygen content in the centrifuge cavity exceeds 8%, the heating temperature of the heating component increases by 15°C for every 0.2% increase; when the oxygen content reaches 10%, the large nitrogen valve assembly is fully opened to inject nitrogen into the centrifuge cavity.

[0031] Among them, after the centrifuge is started, the collection and monitoring module extracts the sample gas from the inner cavity of the centrifuge through the gas sampling pump to the inner cavity of the zirconium oxide analyzer 13 for online oxygen content detection every 10 minutes.

[0032] Among them, the online oxygen content detection system also includes an alarm module and a storage module; Alarm module: used to sound an alarm when the oxygen content in the centrifuge cavity exceeds 10%, and automatically stop the centrifuge; Storage module: used to store the real-time oxygen content data of the inner cavity when the centrifuge is working, and for the administrator to review.

[0033] When personnel are using it, start the heating component to heat to above 600°C, the zirconium oxide oxygen analyzer 13 reaches the working temperature, and the sample gas in the centrifuge cavity is collected by the gas sampling pump and input into the inner cavity of the zirconium oxide analyzer 13 to detect the oxygen content data. When the detected oxygen content is lower than 6%, the centrifuge is started, and the small nitrogen valve assembly starts to work at the same time. When the temperature is above 600°C, the electromagnet 10 of the small nitrogen valve assembly begins to gradually lose its magnetism. The closer to the Curie temperature, the smaller the magnetism, and the smaller the magnetic attraction to the movable magnet 9. When the valve plate 8 is inside the mounting frame 8, the spring 6 is in tension. State, due to the pull of the spring 6 reset action, the valve plate 8 gradually moves to the outside of the installation frame 7 under the elastic action of the spring 6. At this time, the small nitrogen valve assembly gradually opens to inject nitrogen into the inner cavity of the centrifuge. The amount of nitrogen injected per unit time is related to the opening size of the small nitrogen valve assembly. The more the valve plate 8 slides to the outside of the installation frame 7, the more nitrogen is injected per unit time, until the spring 6 resets and no longer pulls the valve plate 8 to move. The operation mode of the large nitrogen valve is the same as that of the small nitrogen valve, so no further details are given here. At the same time, the minimum working temperature of the large nitrogen valve is 700°C.

[0034] When the heating component is started and heated to 600°C, the working temperature of the zirconium oxide oxygen analyzer 13 is just reached. At this time, the oxygen content of the gas in the centrifuge cavity is detected by the zirconium oxide oxygen analyzer 13. At the same time, the electromagnet 10 in the small nitrogen valve assembly just reaches the lowest value of the demagnetization temperature range at 600°C. At this time, the temperature continues to rise, and the electromagnet 10 in the small nitrogen valve assembly is continuously demagnetized until the Curie temperature is reached, and the electromagnet is completely demagnetized. The Curie temperature of the electromagnet 10 is different because of its different types. Therefore, the types of electromagnets in the small nitrogen valve assembly and the large nitrogen valve assembly are distinguished. The Curie temperature of the electromagnet 10 in the small nitrogen valve assembly is lower than the Curie temperature of the electromagnet in the large nitrogen valve assembly, so that the opening and closing of the two valve assemblies are controlled according to the different temperatures. When the temperature is 600°C When the temperature is below 600-700°C, the zirconia oxygen analyzer 13 and the two nitrogen valve assemblies do not work. When the temperature is 600-700°C, the zirconia oxygen analyzer 13 starts to work, and at the same time, the electromagnet 10 in the small nitrogen valve assembly gradually loses its magnetism and gradually loses its attraction to the active magnet 9, so that the valve plate 8 with the active magnet 9 fixed on one side is pulled by the spring 6 to slide to the outside of the mounting frame 7 during the elastic reset process of the spring 6, so that nitrogen enters the inner cavity of the centrifuge from the mounting frame 7. When the temperature is 700-850°C, not only does the electromagnet 10 in the small nitrogen valve assembly completely lose its magnetism, the small nitrogen valve assembly is fully opened to inject nitrogen into the centrifuge, but the electromagnet 10 in the large nitrogen valve assembly also gradually loses its magnetism, and the large nitrogen valve assembly also gradually opens to inject nitrogen into the inner cavity of the centrifuge.

[0035] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A centrifuge nitrogen protection device, characterized in that: It comprises a zirconia oxygen analyzer (13), a small nitrogen valve assembly and a large nitrogen valve assembly arranged on the outer surface of a centrifuge body (1), wherein the zirconia oxygen analyzer (13) and the two nitrogen valve assemblies are connected via a heating assembly; a gas sampling pump at one end of the zirconia oxygen analyzer (13) penetrates the outer wall of the centrifuge body (1) to its inner cavity; The small nitrogen valve assembly has the same structure as the large nitrogen valve assembly, except that the cross-sectional area of ​​the nitrogen inlet of the large nitrogen valve assembly is twice the cross-sectional area of ​​the nitrogen inlet of the small nitrogen valve assembly; both nitrogen valve assemblies comprise a mounting frame (7), the mounting frame (7) being welded to the outer wall of the centrifuge body (1), and one end of the mounting frame (7) passing through the outer wall of the centrifuge body (1) to its inner cavity; a mounting groove is provided on one side of the mounting frame (7), a valve plate (8) is movably mounted inside the mounting groove, a circular hole is provided inside the valve plate (8), a connecting rod (5) passes through the circular hole, one end of the connecting rod (5) is fixedly connected to the inner wall of one side of the mounting frame (7), and a spring (6) is sleeved on the circumferential side of the connecting rod (5), one end of the spring (6) is fixedly connected to the inner wall of one end of the circular hole; one side outer wall of the mounting frame (7) is fixedly connected to the electromagnet (10); and a movable magnet (9) is fixedly connected to the side of the valve plate (8) adjacent to the electromagnet (10).

2. A centrifuge nitrogen protection device according to claim 1, characterized in that: The zirconium oxide oxygen analyzer (13) and the electromagnets (10) of the two nitrogen valve assemblies are respectively provided with mounting holes, and a copper tube (3) passes through the three mounting holes respectively, and a coil (2) is sleeved on the side surface of the copper tube (3).

3. A centrifuge nitrogen protection device according to claim 1, characterized in that: The zirconium oxide oxygen analyzer (13) uses a gas sampling pump to mix the nitrogen entering the inner cavity of the centrifuge with air, and then inhales the gas into the inner cavity sensor of the zirconium oxide oxygen analyzer (13) to detect the oxygen content inside the centrifuge. The zirconium oxide oxygen analyzer (13) is within the working range temperature. The higher the temperature, the more accurate the oxygen content measurement.

4. A centrifuge nitrogen protection device according to claim 1, characterized in that: The other end of the connecting rod (5) is fixedly connected to the side of a fixing plate (4), and the fixing plate (4) is fixedly connected to the outer side of the centrifuge body (1); the side of the fixing plate (4) is fixedly connected to the other end of the spring (6); the electromagnets (10) of the two nitrogen valve assemblies are both fixedly connected to one side of a power supply (12) and are electrically connected to the power supply (12), and the power supply (12) is fixedly connected to the centrifuge body (1).

5. A centrifuge online oxygen content detection system, applied to the centrifuge nitrogen protection device according to claim 4, characterized in that: It includes a processing module, and a temperature control module, a collection module and a decision module that respectively establish communication connections with the processing module; Processing module: used to provide a centralized interface for the system administrator of the oxygen detection system to configure and maintain the various functions of the system. It is also used to manage the operation of each module of the oxygen detection system and summarize the operation data of each module and display it on the centralized interface; Temperature control module: used to control the heating temperature of the heating component so as to achieve the working temperature range of the zirconium oxide oxygen analyzer (13) and the demagnetization temperature range of the electromagnet (10); wherein the working temperature range of the zirconium oxide oxygen analyzer (13) is 600-850° C., the demagnetization temperature range of the electromagnet (10) in the small nitrogen valve component is 600-700° C., and the demagnetization temperature range of the electromagnet (10) in the large nitrogen valve component is 700-850° C.; The collection monitoring module is used to control the zirconium oxide oxygen analyzer (13) in real time to collect the oxygen content of the inner cavity of the centrifuge body (1) when it is working; and output the collected real-time oxygen content data to the decision module; The decision module is used to receive the collected real-time oxygen content and issue a corresponding decision command to the operation module according to the decision plan and the real-time oxygen content. The decision plan includes the following contents: when the real-time working oxygen content in the centrifuge cavity is lower than 6%, the centrifuge is started. At this time, the heating temperature of the heating component is 600°C, reaching the working temperature of the zirconium oxide oxygen analyzer (13), and the electromagnet (10) in the small nitrogen valve component reaches the minimum value of the demagnetization temperature range, and the small nitrogen valve component is opened to inject nitrogen into the centrifuge cavity; when the real-time working oxygen content in the centrifuge cavity is higher than 8%, the heating temperature of the heating component is increased to above 700°C, and the two nitrogen valve components are opened to inject nitrogen into the centrifuge cavity; when the two nitrogen valve components are fully opened to inject nitrogen into the centrifuge for a period of time, and the oxygen content continues to rise and exceeds 10%, the centrifuge is stopped.

6. The centrifuge online oxygen content detection system according to claim 5, characterized in that: The zirconium oxide oxygen analyzer (13) calculates the oxygen content in the sample gas according to the Nernst equation, as shown in formula (1): （1） Where: E is the output electromotive force, R is the gas constant; T is the working temperature of zirconia; K is the correction coefficient; F is the Faraday constant; is the oxygen content of the reference gas; P is the oxygen content in the sample gas.

7. The centrifuge online oxygen content detection system according to claim 6, characterized in that: The decision-making scheme in the decision-making module also includes the following specific contents: when the real-time working oxygen content in the centrifuge cavity is lower than 6%, the heating temperature of the heating component is 600°C; when the real-time working oxygen content in the centrifuge cavity exceeds 6%, the heating temperature of the heating component increases by 10°C for every 0.2% increase; when the oxygen content reaches 8%, the small nitrogen valve assembly is fully opened to inject nitrogen into the centrifuge cavity; when the real-time working oxygen content in the centrifuge cavity exceeds 8%, the heating temperature of the heating component increases by 15°C for every 0.2% increase; when the oxygen content reaches 10%, the large nitrogen valve assembly is fully opened to inject nitrogen into the centrifuge cavity.

8. The centrifuge online oxygen content detection system according to claim 7, characterized in that: After the centrifuge is started, the acquisition monitoring module extracts sample gas from the inner cavity of the centrifuge through a gas sampling pump into the inner cavity of the zirconium oxide analyzer (13) every 10 minutes to perform online oxygen content detection.

9. The centrifuge online oxygen content detection system according to claim 8, characterized in that: The online oxygen content detection system also includes an alarm module and a storage module; Alarm module: used to sound an alarm when the oxygen content in the centrifuge cavity exceeds 10%, and automatically stop the centrifuge; Storage module: used to store the real-time oxygen content data of the inner cavity when the centrifuge is working, and for the administrator to review.

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