Temperature measuring device for crucible outlet

Abstract

The utility model relates to a crucible outlet temperature measuring device, and relates to the field of isotope electromagnetic separation technologies. The device comprises a thermocouple used for measuring the temperature of an outlet of a crucible, a bulb arranged at the joint of the crucible and an arc discharge chamber, a protection line pipe connected with the bulb, an insulation protection piece used for protecting a wire of the thermocouple, and a measuring instrument connected with the wire of the thermocouple. A hot contact of the thermocouple is embedded in the fritillary bulb, the fritillary bulb is in threaded connection with the outer wall of an outlet of the crucible, a wire part of the thermocouple is embedded in the protective line pipe, and the protective line pipe extends in the direction away from an arc discharge chamber. And a wire of the thermocouple extends out of the protective wire tube, and a part of the wire, which is positioned in the ion source, is connected with the insulating protective piece. The temperature of the crucible outlet can be measured in real time, so that the cooling and stacking phenomena at the crucible outlet are effectively reduced.

Description

Technical Field

[0001] The present application relates to the field of isotope electromagnetic separation technology, and in particular to a temperature measuring device for a crucible outlet. Background Art

[0002] Isotope electromagnetic separation is a widely used isotope separation technology. The basic working principle of an isotope electromagnetic separator is that an ion source emits ions, which are accelerated by an electric field and then enter a magnetic field. Under the action of the magnetic field, the ions are deflected. Isotopes of different masses have different deflection radii, which allows isotope separation. The crucible and arc discharge chamber are key components of the ion source. The ion source includes a crucible, a support tube, a rectangular flange, and an arc discharge chamber. A heating element is provided on the outside of the crucible, and a reflector tube is provided on the outside of the heating element. The rectangular flange is provided on the outside of the reflector tube, one end of the rectangular flange is connected to the support tube, and the end of the rectangular flange away from the support tube is connected to the arc discharge chamber. A thermocouple temperature measurement assembly is provided in the ion source. The thermocouple temperature measurement assembly is used to measure the temperature at the tail of the crucible. The thermocouple temperature measurement assembly includes a thermocouple guide rod provided in the center of the ion source.

[0003] The traditional crucible is directly connected to the arc discharge chamber via a threaded connection. After the crucible is heated, the ytterbium chloride vapor enters the ionization chamber through the boat plate and gas distribution plate. The filament emits electrons, which, under the influence of the magnetic and electric fields, rotate into the arc discharge chamber and ionize the ytterbium chloride vapor to form a plasma. The traditional interface between the crucible outlet and the arc discharge chamber does not have a heating device, which results in heat loss. If the temperature at the crucible outlet is lower than 800°C, the ytterbium chloride vapor will cool and condense at the interface, affecting the arc starting process. Currently, there is no temperature measuring device at the crucible outlet. Workers usually judge whether the crucible outlet temperature is lower than 800°C based on the temperature at the crucible tail and experience. However, this judgment method is not accurate enough, which can lead to cooling piles at the interface between the crucible and the arc discharge chamber.

[0004] Regarding the above-mentioned related technologies, the inventors believe that there is an inaccuracy problem in judging the temperature at the crucible outlet based on the temperature at the crucible tail and experience, which may lead to cooling piles at the interface between the crucible and the arc discharge chamber. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a temperature measuring device for a crucible outlet.

[0006] The present application provides a crucible outlet temperature measuring device, which adopts the following technical solution:

[0007] A temperature measuring device for a crucible outlet comprises a thermocouple for measuring the temperature of the crucible outlet, a mother-of-pearl arranged at the interface between the crucible and an arc discharge chamber, a protective wire tube connected to the mother-of-pearl, an insulating protective member for protecting the wires of the thermocouple, and a measuring instrument connected to the wires of the thermocouple; the hot junction of the thermocouple is embedded in the mother-of-pearl, the mother-of-pearl is threadedly connected to the outer wall of the crucible outlet, the wire portion of the thermocouple is embedded in the protective wire tube, the protective wire tube extends in a direction away from the arc discharge chamber, and the portion of the wire of the thermocouple that extends out of the protective wire tube and is located in an ion source is connected to the insulating protective member.

[0008] Preferably, the material of the mother-of-pearl and the protective wire tube is boron nitride, and the mother-of-pearl and the protective wire tube are an integrally formed structure.

[0009] Preferably, the protective wire tube extends through the gap between the heating element and the reflective cylinder, and the protective wire tube is arranged inside the reflective cylinder.

[0010] By adopting the above technical solution, the hot junction of the thermocouple is embedded in the mother-of-pearl made of boron nitride to form an armored thermocouple. The mother-of-pearl protects the thermocouple, so that the thermocouple can measure temperature under high temperature and high pressure conditions. The protective wire tube made of boron nitride effectively protects the wire of the thermocouple, and the protective wire tube is set in the gap between the heating element and the reflective tube. The part of the wire of the thermocouple that extends out of the protective wire tube and is located in the ion source is insulated and protected by an insulating protective member, so that the thermocouple can measure the temperature at the position of the crucible outlet and can monitor the temperature of the crucible outlet in real time. It has a great reference significance for the parameter adjustment of arc discharge chamber heating and crucible heating, and can effectively prevent the occurrence of cooling piles at the interface between the crucible and the arc discharge chamber.

[0011] Preferably, the insulating protective member is an insulating ceramic, which is sleeved on the outside of the wire of the thermocouple and is used to isolate the adjacent wires of the thermocouple.

[0012] Preferably, the insulating ceramic is arranged in a thermocouple guide rod, and the wire of the thermocouple extends out of the ion source through the thermocouple guide rod.

[0013] By adopting the above technical solution, the insulating ceramic exhibits high mechanical strength, wear resistance, excellent insulation properties under high-temperature conditions, and stable chemical and physical properties. Therefore, the insulating ceramic effectively protects the thermocouple wires, enabling the thermocouple to operate normally under high-temperature and high-pressure conditions, and further enabling real-time measurement and monitoring of the crucible outlet temperature. The insulating ceramic is disposed within the thermocouple guide rod, allowing the thermocouple wires to pass through the thermocouple guide rod and out of the ion source. The thermocouple guide rod supports and protects the insulating ceramic and the thermocouple wires.

[0014] Preferably, the wire of the thermocouple is connected to a voltage isolation device after extending out of the ion source, and the wire of the thermocouple is connected to the measuring instrument after passing through the voltage isolation device.

[0015] Preferably, the voltage isolation device is a photoelectric coupling isolator.

[0016] By adopting the above technical solution, the optocoupler isolator effectively protects the thermocouple and the measuring instrument, reducing the damage to the measuring instrument caused by high voltage.

[0017] In summary, this application has the following beneficial technical effects:

[0018] 1. The temperature at the crucible outlet can be measured in real time by thermocouple, which has great reference significance for the adjustment of arc discharge chamber heating and crucible heating parameters;

[0019] 2. By real-time monitoring of the temperature at the crucible outlet, the occurrence of cooling piles at the interface between the crucible and the arc discharge chamber can be effectively prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a temperature measuring device for a crucible outlet;

[0021] Figure 2 It is a partial structural diagram of the ion source;

[0022] Figure 3 It is a schematic diagram of the partial structure of a temperature measuring device at a crucible outlet and an ion source;

[0023] Figure 4 It is a schematic diagram of the structure of the protective wire tube and the heating element;

[0024] Figure 5 It is a schematic diagram of the structure of the mother-of-pearl, protective wire tube, heating element and reflector tube;

[0025] Figure 6 It is a schematic diagram of the partial cross-section structure of the support tube, thermocouple guide rod and insulating ceramic;

[0026] Figure 7 It is a schematic diagram of the cross-sectional structure of insulating ceramics and thermocouples.

[0027] Explanation of the accompanying symbols: 1. Thermocouple; 2. Mother-of-pearl; 3. Protective wire tube; 4. Insulating protective part; 41. Insulating ceramic; 411. Connecting hole; 5. Measuring instrument; 6. Ion source; 61. Crucible; 62. Support tube; 63. Rectangular flange; 64. Arc discharge chamber; 65. Heating element; 651. Gap hole; 66. Reflecting tube; 67. Thermocouple guide rod; 7. Voltage isolation device; 71. Optocoupler isolator. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-7 This application is described in further detail.

[0029] An embodiment of the present application discloses a temperature measuring device for a crucible outlet.

[0030] Reference Figure 1 、 Figure 2 and Figure 3 A temperature measuring device for a crucible outlet includes a thermocouple 1 for measuring the outlet temperature of a crucible 61, a mother-of-pearl 2 arranged at the interface between the crucible 61 and the arc discharge chamber 64, a protective wire tube 3 connected to the mother-of-pearl 2, an insulating protective member 4 for protecting the wires of the thermocouple 1, and a measuring instrument 5 connected to the wires of the thermocouple 1.

[0031] The ion source 6 comprises a crucible 61, a support tube 62, a rectangular flange 63, and an arc discharge chamber 64. A heating element 65 is sheathed around the crucible 61, and a reflector tube 66 is sheathed around the heating element 65. A clearance hole 651 is defined in the heating element 65. The rectangular flange 63 is sheathed around the reflector tube 66. One end of the rectangular flange 63 is connected to the support tube 62, and the end away from the support tube 62 is connected to the arc discharge chamber 64. A thermocouple guide rod 67 is provided within the ion source 6.

[0032] The insulating protective member 4 is an insulating ceramic 41, which is sleeved on the outside of the wire of the thermocouple 1 and is used to insulate the wire of the adjacent thermocouple 1. The insulating ceramic 41 is set in the thermocouple guide rod 67, and the wire of the thermocouple 1 extends out of the ion source 6 through the thermocouple guide rod 67.

[0033] The wire of the thermocouple 1 extends out of the ion source 6 and is connected to a voltage isolating device 7 . The wire of the thermocouple 1 is connected to the measuring instrument 5 after passing through the voltage isolating device 7 . The voltage isolating device 7 is a photoelectric coupling isolator 71 .

[0034] The hot contact of the thermocouple 1 is embedded in the mother-of-pearl 2, and the mother-of-pearl 2 is threadedly connected to the outer wall of the outlet of the crucible 61. The wire portion of the thermocouple 1 is embedded in the protective wire tube 3, and the protective wire tube 3 extends in a direction away from the arc discharge chamber 64. The wire of the thermocouple 1 extends out of the protective wire tube 3 and the part located in the ion source 6 is connected to the insulating protective part 4.

[0035] Reference Figure 4 and Figure 5 The material of the mother-of-pearl 2 and the protective wire tube 3 are both boron nitride, and the mother-of-pearl 2 and the protective wire tube 3 are an integrally formed structure.

[0036] The protective wire tube 3 extends through the gap between the heating element 65 and the reflective cylinder 66 and is disposed inside the reflective cylinder 66. The protective wire tube 3 is disposed in the gap hole 651 of the heating element 65.

[0037] Reference Figure 6 and Figure 7 The thermocouple guide rod 67 is set in the middle position of the support tube 62, and the insulating ceramic 41 is set in the middle position of the thermocouple guide rod 67. Two connecting holes 411 are opened on the insulating ceramic 41, and the two wires of the thermocouple 1 pass through one connecting hole 411 respectively.

[0038] The implementation principle of a temperature measurement device for a crucible outlet in an embodiment of the present application is as follows: the hot contact of the thermocouple 1 is embedded in a mother-of-pearl 2 made of boron nitride. Boron nitride has good thermal conductivity, high temperature resistance, and insulation properties, and thus can effectively protect the thermocouple 1, allowing the thermocouple 1 to measure the temperature at the outlet of the crucible 61. The insulating ceramic 41 insulates and protects the wires of the thermocouple 1, and the thermocouple guide rod 67 supports and protects the insulating ceramic 41 and the wires of the thermocouple 1, thereby allowing the wires of the thermocouple 1 to pass through the support tube 62 and extend out of the ion source 6. The photoelectric coupling isolator 71 protects the measuring instrument 5, thereby reducing the impact of high voltage on the measuring instrument 5.

[0039] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A crucible outlet temperature measuring device, characterized in that: The invention comprises a thermocouple (1) for measuring the temperature of the crucible (61) outlet, a mother-of-pearl (2) arranged at the interface between the crucible (61) and the arc discharge chamber (64), a protective wire tube (3) connected to the mother-of-pearl (2), an insulating protective member (4) for protecting the wire of the thermocouple (1), and a measuring instrument (5) connected to the wire of the thermocouple (1); the hot junction of the thermocouple (1) is embedded in the mother-of-pearl (2), the mother-of-pearl (2) is threadedly connected to the outer wall of the outlet of the crucible (61), the wire portion of the thermocouple (1) is embedded in the protective wire tube (3), the protective wire tube (3) extends in a direction away from the arc discharge chamber (64), and the wire of the thermocouple (1) extends out of the protective wire tube (3) and is located in the ion source (6) and is connected to the insulating protective member (4).

2. The crucible outlet temperature measuring device according to claim 1, characterized in that: The material of the mother-of-pearl (2) and the protective wire tube (3) is boron nitride, and the mother-of-pearl (2) and the protective wire tube (3) are an integrally formed structure.

3. The crucible outlet temperature measuring device according to claim 2, characterized in that: The protective wire tube (3) extends through the gap between the heating element (65) and the reflective cylinder (66), and the protective wire tube (3) is arranged inside the reflective cylinder (66).

4. The crucible outlet temperature measuring device according to claim 3, characterized in that: The insulating protective member (4) is an insulating ceramic (41), and the insulating ceramic (41) is sleeved on the outside of the wire of the thermocouple (1). The insulating ceramic (41) is used to isolate the wires of adjacent thermocouples (1).

5. The crucible outlet temperature measuring device according to claim 4, characterized in that: The insulating ceramic (41) is arranged in a thermocouple guide rod (67), and the wire of the thermocouple (1) extends out of the ion source (6) through the thermocouple guide rod (67).

6. The crucible outlet temperature measuring device according to claim 1, characterized in that: The wire of the thermocouple (1) extends out of the ion source (6) and is connected to a voltage isolation device (7). The wire of the thermocouple (1) passes through the voltage isolation device (7) and is connected to the measuring instrument (5).

7. The crucible outlet temperature measuring device according to claim 6, characterized in that: The voltage isolation device (7) is a photoelectric coupling isolator (71).

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