Sulfur dioxide distillation apparatus
By combining electromagnetic induction heating with a temperature control probe, the problems of uneven heating and inaccurate temperature control in food testing are solved, achieving rapid and uniform heating and improving the safety and accuracy of testing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEILONGJIANG PROVINCE BEITEST TESTING EVALUATION CONSULTING & CERTIFICATION CO LTD
- Filing Date
- 2025-09-03
- Publication Date
- 2026-07-03
AI Technical Summary
In current food testing methods, both direct contact and indirect heating suffer from uneven heating, low efficiency, and inaccurate temperature control, which affect the release of sulfur dioxide and the accuracy of detection. Furthermore, there are risks of glass distillation flasks shattering and chemical reactions.
Employing the principle of electromagnetic induction heating, the metal block generates eddy currents in an alternating magnetic field, using a test tube as an intermediate heating source and combining it with a temperature control probe to control the heating in real time. This avoids direct contact and achieves uniform heating, reducing heat loss and the risk of localized overheating.
It achieves rapid and uniform heating, improves heating efficiency and testing safety, ensures the accuracy of test results and the safety of experimental equipment, and is suitable for distillation flasks made of fragile materials such as glass.
Smart Images
Figure CN224442189U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of food testing, and in particular to a sulfur dioxide distillation apparatus. Background Technology
[0002] In the field of food testing, detecting sulfur dioxide content in food is a crucial step in ensuring food safety. The testing process often involves heating and distilling the sample extract (stored in a distillation flask or similar vessel) to release and capture sulfur dioxide, enabling quantitative analysis. The temperature range is typically controlled around 100℃. At this temperature, sulfur dioxide (and its sulfite and other forms) in the sample are effectively released and escape with the distillation vapors. This avoids excessive volatilization of other volatile components due to excessively high temperatures, or incomplete release of sulfur dioxide due to excessively low temperatures, thus ensuring the accuracy and efficiency of the detection. In practice, the temperature range of 95-105℃ is fine-tuned depending on the sample matrix, such as fruits, vegetables, or alcoholic beverages, to achieve optimal distillation results. Currently, commonly used heating methods present several problems in this scenario.
[0003] Direct contact heating, such as using heating wires or heating rods to directly contact the distillation flask or extract, can easily cause a sudden increase in the local temperature of the distillation flask. For glass distillation flasks commonly used in this type of detection, excessive local temperature differences can easily cause them to crack, which not only affects the detection process but may also cause sample loss or injury to the experimental personnel. At the same time, direct contact between the heating device and the extract may trigger a chemical reaction, interfering with the release and capture of sulfur dioxide, leading to deviations in the detection results.
[0004] Indirect heating methods, such as water baths and oil baths, can alleviate localized overheating to some extent, but their heating efficiency is low and the heating rate is slow, making it difficult to meet the distillation rate requirements for sulfur dioxide detection. Furthermore, their temperature control precision is insufficient, and unstable heating can easily lead to incomplete or excessive release of sulfur dioxide, affecting detection accuracy. In addition, while some electromagnetic induction-based heating devices achieve indirect heating through metal heating elements, the direct placement of these elements in the extract still poses a risk of metal-liquid reaction. Moreover, they lack convenient heating control mechanisms and cannot flexibly adjust the heating state according to the distillation process, resulting in poor adaptability. Utility Model Content
[0005] To overcome the shortcomings of the existing technology, this utility model provides a sulfur dioxide distillation apparatus that can directly contact the heating source with the liquid medium for heating, ensuring uniform heating while reducing the occurrence of local overheating of the apparatus.
[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a sulfur dioxide distillation apparatus. The distillation apparatus is placed on a cabinet, characterized in that: the distillation apparatus includes a distillation flask for holding the medium to be tested and a heating component for heating the distillation flask. The heating component includes a sleeve, a heating coil and a metal block. The sleeve is set on the cabinet, the heating coil is coiled inside the sleeve, and a receiving space is formed inside the heating coil. The distillation flask is placed in the receiving space, and a metal block is set inside the distillation flask.
[0007] Furthermore, the heating assembly also includes a test tube containing a metal block, and a distillation flask having a first channel and a second channel, with the test tube inserted into the distillation flask through the first channel.
[0008] Furthermore, the gap between the first channel and the test tube is filled with a sealing component.
[0009] Furthermore, the sealing component is a rubber stopper.
[0010] Furthermore, the heating assembly also includes a positioning rod, a slider, and a collar. The positioning rod is mounted on the cabinet, the slider can be slidably fixed at any position on the positioning rod, and the collar is fixed to the slider via a connecting rod. The test tube is fitted onto the collar.
[0011] Furthermore, a temperature acquisition device is attached to the outer wall of the distillation flask.
[0012] Furthermore, the temperature acquisition device is a temperature control probe, which is the temperature detection module of an electronic temperature controller. The electronic temperature controller is also used to control the on / off state of the power supply connected to the heating coil.
[0013] Furthermore, a support base is placed at the bottom of the distillation flask, and the support base is located outside the receiving space where the coil is inserted. The temperature control probe is fixed to the bottom of the distillation flask, and when the distillation flask is placed on the support base, the temperature control probe is in contact with its outer wall.
[0014] Furthermore, a condenser is connected to the second channel.
[0015] Furthermore, multiple sets of sleeves and heating components that correspond to and cooperate with the sleeves can be arranged in an array at equal intervals along the length of the cabinet.
[0016] Compared with the prior art, the beneficial effects that this utility model can achieve are:
[0017] 1. Employing the principle of electromagnetic induction heating, the metal block directly generates eddy currents in an alternating magnetic field, bypassing the multiple heat transfer stages of "heat source → container → medium" in traditional heating. This reduces heat loss and allows the medium to quickly reach the target temperature, significantly improving heating efficiency. By setting the metal block to generate heat through electromagnetic induction, the heat is first transferred to the test tube, which acts as an intermediate heating source, achieving uniform heat dissipation. This avoids the problem of container breakage due to localized overheating in traditional direct heating methods, making it particularly suitable for distillation flasks made of fragile materials such as glass, thus improving experimental safety.
[0018] 2. The control mechanism, consisting of a positioning rod, a slider, and a collar, can conveniently drive the test tube to move along the axial direction of the positioning rod, and further optimize the detection method.
[0019] 3. The heating can be flexibly controlled by detecting the temperature of the outer wall of the distillation flask through a temperature acquisition device, which makes it easier for staff to accurately control the heating time according to experimental needs and improves the convenience of operation. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0021] Figure 2 for Figure 1 A cross-sectional view;
[0022] Figure 3 A schematic diagram showing the positional structure of the positioning rod, slider, and collar mounted on the cabinet.
[0023] Figure 4 A cross-sectional view of a distillation flask assembled inside a sleeve;
[0024] Figure 5 This is a cross-sectional view of the test tubes assembled inside the sleeve.
[0025] The components include: cabinet 1; positioning rod 11; slider 12; collar 13; test tube 14; metal block 15; sleeve 2; heating coil 21; distillation flask 3; first channel 31; second channel 32; rubber stopper 4; support base 5; and temperature control probe 6. Detailed Implementation
[0026] To address the technical problems mentioned in the background art, this application provides a non-direct contact heating device to avoid direct contact between the heating device and the container holding the sample, thereby preventing the container from becoming excessively hot in certain areas.
[0027] This application includes, for example Figure 1The cabinet 1 shown is used to store the equipment used in the entire device. The cabinet 1 is equipped with heating components for heating the medium to be tested. Multiple sets of heating components are arranged in an array at equal intervals along the length of the cabinet 1. The heating components include, for example,... Figure 2 The sleeve 2 and the heating coil 21 disposed within the sleeve 2 are shown. The axis of the sleeve 2 is collinear with the axis of the heating coil 21. The cabinet 1 is equipped with a power supply for providing power to the heating coil 21, which can be a battery or an external power source. The heating coil 21 is arranged in a ring-shaped structure within the sleeve 2, forming an internal space adapted to the size of the distillation flask 3. The distillation flask 3 is stably placed within this space, and the medium to be tested (such as chemical reagents, biological samples, or other temperature-controlled fluids) is contained within the distillation flask 3. To achieve efficient heating of the medium to be tested, a metal block 15 made of a magnetically conductive metal (such as iron, stainless steel, etc.) is placed inside the distillation flask 3, and the main body of the metal block 15 is completely within the magnetic field region surrounded by the heating coil 21, ensuring that it can fully receive the electromagnetic energy generated by the coil.
[0028] When the heating coil 21 is connected to a high-frequency alternating current, a high-frequency alternating magnetic field is immediately generated around it. This magnetic field diffuses into the internal space centered on the heating coil 21, and the free electrons inside the metal block 15 within the magnetic field range are affected by the Lorentz force under the action of the alternating magnetic field. As the direction of the magnetic field changes frequently with the direction of the current, the direction of movement of the free electrons also changes rapidly, forming eddy currents—that is, closed loops generated by the metal block 15.
[0029] When the eddy current passes through the resistance of the metal block 15, it generates a large amount of heat energy due to the Joule-Lenz law, causing the metal block 15 to heat up rapidly. At this time, the metal block 15 acts as an "internal heat source," transferring heat to the medium in contact with it through direct thermal conduction. Meanwhile, the heated medium diffuses the heat throughout the entire distillation flask 3 through natural convection or forced convection (such as gentle stirring), ultimately achieving uniform and efficient heating of the medium.
[0030] This method of heating the metal block 15 itself through electromagnetic induction skips the multi-layered heat transfer process of "heat source → container → medium" in traditional heating, reducing heat loss and allowing the medium to reach the target temperature in a shorter time. Furthermore, during the heating process, the outer wall of the distillation flask 3 receives heat only through the medium, effectively reducing the risk of the glass distillation flask cracking due to excessive local temperature differences.
[0031] Furthermore, to fundamentally avoid direct contact between the metal block 15 and the test medium inside the distillation flask 3, which could trigger unnecessary chemical reactions and affect the accuracy of experimental results or lead to the loss of experimental materials, the heating assembly also includes a test tube 14. The metal block 15 is placed inside the test tube 14, which is equipped with a heat-conducting medium to transfer the heat generated by the metal block 15 to the side wall of the test tube 14, and then to the test medium inside the distillation flask 3. Preferably, the heat-conducting medium is heat-conducting oil, and the distillation flask 3 is provided with a first channel 13 for inserting the test tube 14. When the metal block 15 generates heat through its own heating, the heat is first transferred to the test tube 14 through the heat-conducting oil, heating the test tube 14. The heated test tube 14 then becomes a special heat source. This heating source has two significant advantages. First, due to the material properties of the test tube 14, it will not react chemically with the test medium inside the distillation flask 3, thus preventing any adverse effects from the metal block 15 contacting the medium. Second, after absorbing the heat transferred by the metal block 15, the test tube 14 can achieve uniform heat dissipation, thereby providing a stable and uniform heating environment for the heat-conducting medium inside the distillation flask 3. The inner diameter of the first channel 31 is slightly larger than the outer diameter of the test tube 14 to reduce the space for steam from the heated liquid medium inside the distillation flask 3 to flow out of the first channel 31. Simultaneously, a sealing component is detachably connected to the top of the first channel 31. This sealing component fills the gap between the mouth of the first channel 31 and the test tube 14, ensuring that steam inside the distillation flask 3 does not flow out of the first channel 31. Preferably, the sealing component can be a ring-shaped rubber stopper 4.
[0032] Furthermore, to facilitate operator control of the heating time of the medium inside the distillation flask 3, the heating assembly also includes a positioning rod 11, a slider 12, and a collar 13, as shown below. Figure 3 In this case, the positioning rod 11 is fixed to the cabinet 1, which can be fixed to the cabinet 1 by means of serial mounting, base mounting, etc. The slider 12 is sleeved on the positioning rod 11 and has a threaded hole. After the set screw is tightened through the threaded engagement of the threaded hole, its end is tightly pressed against the surface of the positioning rod 11. With the help of the friction generated between the two, the slider 12 can be stably fixed at any position of the positioning rod 11. The slider 12 and the collar 13 are fixedly connected by a connecting rod. The bottom of the test tube 14 is connected to the collar 13 and the opening of the test tube 14 rests against the collar 13, so that the test tube 14 is suspended.
[0033] Furthermore, to promptly monitor the temperature inside the distillation flask 3 after heating, a temperature control probe 6 is installed inside the sleeve 2 to detect the temperature of the flask wall. The temperature control probe 6 is the detection component of an electronic temperature controller, which also controls the on / off state of the power supply to the heating coil 21. The electronic temperature controller is an existing product, such as the American Air Pt100, which includes a core control unit, a temperature detection module, an input setting module, an output control module, a display module, and a power supply module. The temperature control probe 6 in the temperature detection module is used to detect the temperature of the controlled object in real time (in this embodiment, the controlled object is the wall temperature of the distillation flask 3). It converts the physical quantity of temperature into an electrical signal and transmits it to the core control unit. After receiving the electrical signal, the core control unit converts it into a specific temperature value and compares it with the preset target temperature in the input setting module (the target temperature is in the range of 95-105℃, depending on the sample matrix). Based on the comparison result, the core control unit sends a command to the output control module to control the on / off state of the power supply connected to the heating coil 21. Specifically, if the detected temperature is lower than the preset target temperature, the power supply continues to supply power to the heating coil 21; if the detected temperature is higher than the set target temperature, the power supply to the heating coil 21 is cut off. Throughout the process, the display module synchronizes the current temperature and the target temperature in real time; however, the specific details depend on the actual product structure.
[0034] Furthermore, to improve the detection accuracy of the temperature control probe 6, a hollow support base 5 is provided on the inner bottom of the sleeve 2, such as... Figure 4 and Figure 5 As shown, the support base 5 is located outside the heating coil 21, maintaining a reasonable distance between the heating coil 21 and the temperature control probe 6, or using a shielded high-temperature control probe 6. The probe is connected to the controller via a shielded wire to reduce the impact of electromagnetic interference and heat conduction on temperature measurement accuracy. The support base 5 is made of plastic, and its top inner wall is flush with the bottom outer wall of the distillation flask 3. Through holes for serially mounting the temperature control probes 6 are machined at the bottom of the sleeve 2 and the top of the cabinet 1, respectively. The temperature control probes 6 are fixed to the inner wall of the support base 5. When the distillation flask 3 is placed on the support base 5, the temperature control probe 6 is flush with the distillation flask 3, allowing the temperature control probe 6 to provide real-time feedback on the temperature of the distillation flask wall.
[0035] The distillation flask 3 is provided with a second channel 32, and a condenser (not shown in the figure) is connected to the second channel 32 for condensing and collecting the heated gaseous medium.
[0036] When using the device:
[0037] According to the experimental requirements, the staff injects the test medium into the distillation flask 3, then places the distillation flask 3 into the sleeve 2, so that the entire distillation flask 3 is located in the magnetic field of the heating coil 21, and the bottom of the distillation flask 3 is in contact with the high temperature control probe 6. The heat-conducting medium is injected into the test tube 14, and a metal block 15 is placed in it. The slider 12 is moved along the positioning rod 11 so that the metal block 15 falls into the magnetic field of the heating coil 21. After the power is turned on, the electromagnetic field is used to heat the test medium in the distillation flask 3 with the heat generated by the metal block 15. A condenser is connected to the second channel 32 to condense and recover the steam generated after heating.
[0038] When the temperature control probe 6 detects that the surface of the distillation flask 3 has reached the preset value, the electronic temperature controller cuts off the power supply to the heating coil 21, thereby eliminating the heat source inside the distillation flask 3.
Claims
1. Sulfur dioxide distillation apparatus, placed on a cabinet (1), characterized in that: The distillation apparatus includes a distillation flask (3) for holding the medium to be tested and a heating assembly for heating the distillation flask (3). The heating assembly includes a sleeve (2), a heating coil (21) and a metal block (15). The sleeve (2) is set on the cabinet (1). The heating coil (21) is coiled inside the sleeve (2) and forms a receiving space inside the heating coil (21). The distillation flask (3) is placed in the receiving space. The metal block (15) is set inside the distillation flask (3).
2. The sulfur dioxide distillation apparatus according to claim 1, characterized in that: The heating assembly also includes a test tube (14), a metal block (15) is provided inside the test tube (14), and the distillation flask (3) is provided with a first channel (31) and a second channel (32). The test tube (14) is inserted into the distillation flask (3) through the first channel (31).
3. The sulfur dioxide distillation apparatus according to claim 2, characterized in that: The gap between the first channel (31) and the test tube (14) is filled with a sealing component.
4. The sulfur dioxide distillation apparatus according to claim 3, characterized in that: The sealing component is a rubber stopper.
5. The sulfur dioxide distillation apparatus according to claim 3, characterized in that: The heating assembly also includes a positioning rod (11), a slider (12), and a collar (13). The positioning rod (11) is set on the cabinet (1). The slider (12) can be slidably fixed at any position on the positioning rod (11). The collar (13) is fixed to the slider (12) through a connecting rod. The test tube (14) is sleeved on the collar (13).
6. The sulfur dioxide distillation apparatus according to claim 5, characterized in that: A temperature acquisition device is attached to the outer wall of the distillation flask (3).
7. The sulfur dioxide distillation apparatus according to claim 6, characterized in that: The temperature acquisition device is a temperature control probe (6), which is the temperature detection module of an electronic temperature controller. The electronic temperature controller is also used to control the power supply connected to the heating coil (21).
8. The sulfur dioxide distillation apparatus according to claim 6, characterized in that: A support base (5) is placed at the bottom of the distillation flask (3), and the support base (5) is located outside the receiving space of the coil (21). The temperature control probe (6) is connected in series at the bottom of the distillation flask (3) and fixed on the support base (5). When the distillation flask (3) is placed on the support base (5), the temperature control probe (6) is in contact with its outer wall.
9. The sulfur dioxide distillation apparatus according to claim 8, characterized in that: A condenser is connected to the second channel (32).
10. The sulfur dioxide distillation apparatus according to claim 8, characterized in that: Multiple sets of sleeves (2) and heating components that are used in conjunction with the sleeves (2) can be arranged in an array at equal intervals along the length of the cabinet (1).