A micro distillation range measuring device

Abstract

The utility model discloses a trace distillation measuring device, include: the distillation flask is equipped with the distillation cavity for containing the liquid to be distilled, and with the first branch pipe of distillation cavity intercommunication, and the first branch pipe has the first export end, is equipped with the waste liquid discharge branch pipe on the first branch pipe, the integrated sensing assembly is connected in the first export end through the sealed interface, and the integrated sensing assembly includes: liquid temperature detection department dips into the liquid level below the liquid to be distilled in the distillation cavity, the steam temperature detection department is suspended in the steam area in the distillation cavity, the steam pressure detection department is used for detecting the pressure in the distillation cavity, and the first protection frame is sleeved in the distillation flask outside, and is connected with the integrated sensing assembly, is used for protecting the distillation flask. The structure is through with liquid temperature detection department, steam temperature detection department and steam pressure detection department integration in an integrated sensing assembly, and through single sealed interface is connected in the first export end, has realized the modularization and miniaturization of sensor, has improved trace test precision.

Description

Technical Field

[0001] This application relates to the field of distillation range determination technology, specifically to a micro-distillation range determination device. Background Technology

[0002] Distillation range determination is an important method for evaluating the volatility, component distribution, and purity of liquid mixtures (especially petroleum products, solvents, and chemicals) in the fields of petrochemicals, fine chemicals, and pharmaceuticals. Traditional distillation range determination apparatus (such as Engler distillation and ASTM D86 apparatus) are usually designed for larger sample volumes (such as 100 mL), and their core structure includes a distillation flask, condenser, thermometer, and graduated cylinder.

[0003] However, in scientific research, quality control, or analysis of precious samples, it is often necessary to determine the distillation range of trace samples (such as a few milliliters or even less). Traditional apparatuses used for trace samples suffer from sensor interference and accuracy issues. Specifically, when measuring the liquid phase temperature, gas phase temperature, and system pressure during distillation, traditional methods require installing independent thermometers (such as liquid phase thermometers and gas phase thermometers) and pressure gauges at different locations on the distillation flask. These independent sensors and their interfaces not only occupy a large amount of space, but for trace samples, their volume and heat capacity themselves can significantly interfere with the distillation process (e.g., altering thermodynamic equilibrium, increasing dead volume), leading to distorted measurement results. Furthermore, the installation positions of multiple sensors are difficult to control precisely (especially the immersion depth of the liquid phase thermometer), and this increases sealing difficulties and the risk of leakage. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, this application aims to provide a micro-distillation range measuring device to achieve accurate determination of the distillation range of micro-samples; the device includes: A distillation flask, which has a distillation chamber for containing the liquid to be distilled and a first branch tube connected to the distillation chamber. The first branch tube has a first outlet end and a waste liquid discharge branch tube is provided on the first branch tube. An integrated sensing component is connected to the first outlet end via a sealed interface. The integrated sensing component includes: The liquid temperature detection unit extends into the distillation chamber below the surface of the liquid to be distilled; Steam temperature detection unit, which is suspended in the steam area within the distillation chamber; Steam pressure detection unit, used to detect the pressure inside the distillation chamber; The first protective frame is fitted over the distillation flask and connected to the integrated sensing assembly to protect the distillation flask.

[0005] According to the technical solution provided in the embodiments of this application, the integrated sensing component includes a first housing, the first housing having a first space, one end of the liquid temperature detection unit and the steam temperature detection unit are both installed in the first space, and the other end of both extend out of the first space; a first protective frame is connected to the bottom of the first housing, and a sealing interface is installed at the bottom of the first housing and is located in the space enclosed by the first protective frame.

[0006] According to the technical solution provided in the embodiments of this application, the steam pressure detection unit includes a first pressure inlet hole disposed on the side wall of the first housing and a built-in microchannel communicating with the first pressure inlet hole. The built-in microchannel is used to conduct the pressure of the distillation chamber.

[0007] According to the technical solution provided in the embodiments of this application, the first protective frame includes: The first mounting base is connected to the first housing. Multiple first protective rods are arranged in a circumferential array outside the first branch pipe and are vertically mounted on the first mounting base; The first protective ring is connected to the end of the first protective rod away from the first mounting seat and is used to be sleeved on the outer tube wall of the first branch tube near the distillation chamber. The first protective ring has a first clearance end and a second clearance end that are isolated from each other, and a first clearance opening is formed between the first clearance end and the second clearance end. An arc-shaped connecting rod is provided at the first clearance opening, with one end connected to the first clearance end and the other end connected to the second clearance end. The arc-shaped connecting rod arches towards the first mounting base to protect the waste liquid discharge branch pipe.

[0008] According to the technical solution provided in the embodiments of this application, it also includes a host, the host includes a second housing, the second housing is provided with a sensor socket, a measurement space is formed inside the second housing, a protective cover is provided outside the measurement space and hinged to the second housing, the measurement space is used to place a distillation flask, and the integrated sensing component is fixed to the sensor socket by a plug-in method.

[0009] According to the technical solution provided in the embodiments of this application, the space is equipped with: Heating wires are located at the bottom of the measuring space and are used to support the distillation flask. Waste liquid outlet is located on the side wall of the second shell within the measurement space and is connected to the waste liquid discharge branch pipe; The second pressure port is used to seal and connect with the first pressure port of the integrated sensing component when the integrated sensing component is inserted into the sensor socket to receive pressure signals. The main unit is equipped with a pressure sensor connected to the second pressure inlet to detect the pressure in the distillation chamber.

[0010] According to the technical solution provided in the embodiments of this application, the heating element is connected to a lifting rod, which is used to control the lifting and lowering of the heating element.

[0011] According to the technical solution provided in the embodiments of this application, a waste liquid bottle is provided outside the second shell, and the waste liquid bottle is connected to the waste liquid outlet.

[0012] According to the technical solution provided in the embodiments of this application, the second housing is provided with a sensor placement rack interface for installing a sensor placement rack. The integrated sensing component can be fixed by inserting the sensor placement rack during the unmeasured stage.

[0013] According to the technical solution provided in the embodiments of this application, the host also integrates a touch screen and a data processing module. The touch screen displays the liquid temperature, steam temperature, and steam pressure curves in real time, and the data processing module receives the liquid temperature, steam temperature, and steam pressure data and generates a distillation range curve.

[0014] This utility model has the following beneficial effects: This invention features high integration, significantly reducing interference and improving the accuracy of micro-sample testing. By integrating the liquid temperature detection unit, steam temperature detection unit, and steam pressure detection unit into a single integrated sensing component, connected to the first outlet end via a single sealed interface, it achieves modularization and miniaturization of the sensor. This greatly reduces the physical space and heat capacity occupied by the sensor system within the distillation chamber. This is crucial for determining the distillation range of micro-samples, minimizing the sensor's own interference with the distillation thermodynamic process and ensuring the representativeness and accuracy of the test results. Simultaneously, it simplifies the installation process. Meanwhile, this structure also enables precise control of sensor positions, ensuring data reliability. It clearly defines that the liquid temperature detection unit extends below the liquid surface of the liquid to be distilled in the distillation chamber, while the vapor temperature detection unit is suspended in the vapor region within the distillation chamber. This precise position control ensures the accuracy of liquid phase temperature measurement (direct contact with the liquid) and the representativeness of vapor phase temperature measurement (located in the vapor region, unaffected by cold wall effects, etc.). Since the liquid temperature detection unit, vapor temperature detection unit, and vapor pressure detection unit are integrated into a single sensing component, the relative positions of these detection units are immediately determined when the integrated sensing component is installed at the first outlet end of the distillation flask. Compared to traditional separate installations, this is not only simpler but also ensures the uniformity of installation positions.

[0015] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 A schematic diagram of the structure of the distillation flask and integrated sensing component provided in the embodiments of this application; Figure 2 This is a schematic diagram of the micro-distillation range measuring device provided in the embodiments of this application; Figure 3 This is a schematic diagram of the structure of the first pressure-injecting hole provided in an embodiment of this application.

[0017] Legend: 1. Distillation chamber; 2. First branch pipe; 3. Liquid temperature detection unit; 4. Arc-shaped connecting rod; 5. Waste liquid discharge branch pipe; 6. First protective ring; 7. First protective rod; 8. Skeleton oil seal; 9. First pressure tap; 10. Built-in microchannel; 11. First housing; 12. DB9 serial port; 13. First mounting base; 14. Waste liquid bottle; 15. Touch screen; 16. Second housing; 17. Protective cover; 18. Integrated sensing component; 19. Sensor placement rack; 20. Foot; 21. Steam temperature detection unit. Detailed Implementation

[0018] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] Those skilled in the art will understand that, unless specifically stated otherwise, the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, components, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, components, components, and / or combinations thereof. It should be understood that when we say a component is "connected" to another component, it can be directly connected to the other component or connected via an intermediate component. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items. The terms "first" and "second," etc., in this specification and claims are used to distinguish different objects, not to describe a particular order.

[0020] Example 1 As mentioned in the background section, in view of the problems in the prior art, this application proposes a micro-distillation range measuring device, such as... Figure 1-3 As shown, it includes: A distillation flask, which has a distillation chamber 1 for containing the liquid to be distilled, and a first branch pipe 2 connected to the distillation chamber 1. The first branch pipe 2 has a first outlet end and a waste liquid discharge branch pipe 5 is provided on the first branch pipe 2. An integrated sensing component 18 is connected to the first outlet end via a sealed interface. The integrated sensing component 18 includes: Liquid temperature detection unit 3 extends into the distillation chamber 1 below the surface of the liquid to be distilled; Specifically, the liquid layer of a trace sample is thin (approximately 10 mm). Traditional external temperature measurement methods suffer from a response delay of >3 seconds due to differences in heat capacity and are easily affected by gas phase thermal radiation. In this application, direct contact measurement is used: the tip of the Pt100 probe is only 2 mm from the bottom of the flask, and the immersion depth in the liquid phase is ≥8 mm, directly contacting the sample body. This shortens the thermal response time and avoids temperature oscillations caused by small sample volumes.

[0021] Steam temperature detection unit 21, which is suspended in the steam area inside the distillation chamber 1; Optionally, the end of the steam temperature detection unit 21 is 5 mm from the liquid surface and is located in the core steam flow region. The extension length of the steam temperature detection unit 21 is related to the height of the steam region, which is the region inside the distillation flask with a Reynolds number Re > 2300.

[0022] The steam pressure detection unit is used to detect the pressure inside the distillation chamber 1.

[0023] The first protective frame is fitted over the distillation flask and connected to the integrated sensing component 18 to protect the distillation flask.

[0024] Specifically, the protective frame effectively prevents damage to the glass distillation flask from accidental impacts during installation, relocation, or operation, especially protecting the neck (first branch) where the precision integrated sensing components are connected. This enhances the overall durability, stability, and operational safety of the apparatus.

[0025] Furthermore, a guide vane is provided on the integrated sensing component 18 at a height matching position with the waste liquid discharge branch pipe 5, which is used to guide the waste liquid to the flow restriction hole, and then discharge it from the waste liquid discharge branch pipe 5 through the flow restriction hole.

[0026] Furthermore, the inner diameter of the waste liquid discharge branch pipe 5 is constructed as a capillary structure to form a flow-limiting orifice; the orifice diameter is set such that a stable liquid seal is formed in the flow-limiting orifice by the gravity of the trace amount of waste liquid during the distillation process, and the trace amount of waste liquid generated during the distillation process is allowed to be discharged through the flow-limiting orifice under the action of gravity. Specifically, this device supports oil sample testing of 10ml, much smaller than the traditional 100ml. During use, a quantitative amount (10ml ± 0.3ml) of oil sample is added to the flask using a 10ml syringe or pipette. There is an angle (slanted downwards) between the waste liquid discharge branch 5 and the first branch 2. The core design principle of the flow-limiting orifice is: Objective: Under the condition of gravity discharge of trace amounts of waste liquid (e.g., <1ml / min), simultaneously achieve: a stable liquid seal (preventing vapor escape / air backflow) and controllable waste liquid discharge (without interfering with distillation pressure balance); Implementation principle: Utilizing the balance between capillary effect and gravity-driven flow, a dynamic liquid seal is formed in a pipe with an extremely small orifice: Liquid seal formation: The waste liquid forms a concave meniscus on the inner wall of the capillary (under the action of surface tension), generating additional pressure pointing towards the interior of the liquid, preventing vapor from penetrating the liquid column. Waste liquid discharge: When the waste liquid accumulates to the gravity head P... g >Capillary pressure P c When the flow resistance is increased, the waste liquid is discharged in the form of droplets or continuous thin streams, and the liquid seal is instantly rebuilt.

[0027] Furthermore, the key criteria for size selection are: the upper limit of the orifice diameter must ensure stable liquid seal formation, and the stability of the liquid seal must meet the following requirements: capillary pressure P. c ≥ Maximum vapor pressure difference ΔP vap ;in: Where σ represents the surface tension of the waste liquid (N / m, such as the typical value of 0.02~0.03 N / m for petroleum products), θ represents the contact angle between the waste liquid and the pipe wall (degrees), r represents the capillary radius (m), and ΔP vap This indicates the pressure difference (Pa) between distillation chamber 1 and the external environment, which is typically <500 Pa (5 mbar). Based on this, we can derive: , that is, , where d max The upper limit of the capillary tube diameter is indicated; then, the lower limit of the orifice diameter is determined: to ensure gravity discharge of waste liquid, the waste liquid must be able to be discharged under gravity to avoid clogging: minimum driving pressure P. g, min >Flow resistance P f Among them, P g, min =ρgh, where ρ represents the density of the waste liquid (kg / m³). 3 For example, 800 kg / m 3 h represents the liquid level height (m, typically 0.05~0.1 m), P f Calculate using the Hagen-Poiseuille equation: Where Q represents volumetric flow rate, and the dynamic equilibrium condition is: ,in, Let L be the dynamic viscosity of the waste liquid and L be the length of the capillary section. The lower limit of the capillary diameter can be obtained from this inequality.

[0028] For example, taking an oil sample, σ=0.025 N / m, θ=0°, ΔP vap =300 Pa, from the above formula, the upper limit of the capillary diameter is 0.333 mm; let Q = 0.2 ml / min, L = 10 mm, h = 0.08 m, the lower limit of r is 0.05, corresponding to a lower limit of the capillary diameter of 0.1 mm. After obtaining the upper and lower limits of the capillary diameter, the final pore size is determined by comprehensively considering the liquid seal stability and discharge feasibility. That is, capillary tubes of multiple diameters can be made to observe the measurement process and effect, and the pore size with better measurement effect can be selected as the final pore size. Alternatively, liquid seal stability (passing through 500 Pa compressed air and observing the bubble penetration phenomenon; no bubble penetration is qualified) and discharge continuity (injecting simulated waste liquid; no droplet suspension and smooth discharge without interruption are qualified) experiments can be carried out to verify the pore size. The pore size with qualified liquid seal stability and discharge continuity can be selected as the final pore size.

[0029] In a preferred embodiment, the integrated sensing component 18 includes a first housing 11, which has a first space. One end of the liquid temperature detection unit 3 and the steam temperature detection unit 21 are both installed in the first space, and the other end of both extend out of the first space. A first protective frame is connected to the bottom of the first housing 11, and a sealing interface is installed at the bottom of the first housing 11 and located within the space enclosed by the first protective frame.

[0030] Specifically, the first housing 11 adopts a stainless steel cylindrical structure, forming a cylindrical first space inside, with a sealing cover plate on the top for wiring. The Pt100 platinum resistance probe of the liquid temperature detection unit 3 and the K-type thermocouple probe of the vapor temperature detection unit 21 are both fixed in the first space by epoxy resin potting. The probe end of the liquid temperature detection unit 3 extends downwards by a corresponding length through the bottom of the housing and into the distillation chamber 1 below the liquid surface of the liquid to be distilled. The probe end of the vapor temperature detection unit 21 extends downwards by a corresponding length through the bottom of the housing and is suspended in the vapor area of ​​the distillation chamber 1. When the distillation chamber 1 contains the liquid to be distilled, five boiling stones are placed inside. The first protective frame is connected to the bottom of the first housing 11. The first protective frame has a through hole in its center, with a fluororubber sealing ring embedded in the through hole to form a sealing interface, which is interference-fitted with the first frosted glass first outlet end of the first branch tube 2 of the distillation flask (fit tolerance H7 / g6).

[0031] In a preferred embodiment, the steam pressure detection unit includes a first pressure inlet 9 disposed on the side wall of the first housing 11 and a built-in microchannel 10 communicating with the first pressure inlet 9. The built-in microchannel 10 is used to conduct the pressure of the distillation chamber 1.

[0032] In a preferred embodiment, the first protective frame includes: First mounting base 13, the first mounting base 13 is connected to the first housing 11; Multiple first protective rods 7 are arranged in an axial array outside the first branch pipe 2 and are vertically mounted on the first mounting base 13; The first protective ring 6 is connected to the end of the first protective rod 7 away from the first mounting seat 13 and is used to be sleeved on the outer tube wall of the first branch pipe 2 near the distillation chamber 1. The first protective ring 6 has a first clearance end and a second clearance end that are isolated from each other, and a first clearance opening is formed between the first clearance end and the second clearance end. The arc-shaped connecting rod 4 is located at the first clearance opening, with one end connected to the first clearance end and the other end connected to the second clearance end. The arc-shaped connecting rod 4 arches towards the first mounting base 13 to protect the waste liquid discharge branch pipe 5.

[0033] Specifically, the first mounting base 13 is fixed to the bottom of the first housing 11. The first protective rod 7 consists of three stainless steel rods of different diameters, arranged in a circumferential array and vertically welded to the first mounting base 13. The first protective ring 6 is welded to the end of the first protective rod 7, and a silicone buffer layer can be attached to the inner side of the ring. The arc-shaped connecting rod 4 is a U-shaped steel rod, with both ends welded to the break points of the first protective ring 6 (i.e., the first clearance end and the second clearance end). The arch height completely covers the capillary section of the waste liquid discharge branch pipe 5. The gap between the arch of the arc-shaped connecting rod 4 and the outer wall of the capillary is 2mm, which both prevents collisions and ensures heat dissipation. Furthermore, the side of the first mounting base 13 near the first protective rod 7 also has a skeleton oil seal.

[0034] In a preferred embodiment, the system further includes a host unit, which includes a second housing 16. The second housing 16 has a sensor port and a measurement space is formed inside the second housing 16. A protective cover 17 is hinged to the second housing 16 outside the measurement space. The measurement space is used to place a distillation flask. An integrated sensing component 18 is fixed to the sensor port by a plug-in connection.

[0035] Specifically, the integrated sensing component 18 has a DB9 serial port 12, which is fixed to the sensor port via a plug-in connection. The bottom of the second housing 16 is also provided with feet 20.

[0036] In a preferred embodiment, the measuring space is provided with: Heating wires are located at the bottom of the measuring space and are used to support the distillation flask. Waste liquid outlet is located on the side wall of the second shell 16 in the measuring space and is connected to the waste liquid discharge branch pipe 5. The second pressure port is used to seal and connect with the first pressure port 9 of the integrated sensing component 18 when the integrated sensing component 18 is inserted into the sensor socket to receive pressure signals. The main unit is equipped with a pressure sensor connected to the second pressure inlet to detect the pressure in the distillation chamber 1.

[0037] Specifically, the steam pressure detection system consists of a pressure transmission module of an integrated sensing component 18 and a pressure receiving module of the main unit. The specific assembly relationship is as follows: On the integrated sensing component 18 side: a built-in microchannel 10 is connected to the first outlet end of the first branch pipe 2. The built-in microchannel 10 is located inside the first housing 11, and the side of the built-in microchannel 10 furthest from the first outlet end is connected to a first pressure-sensing hole 9 integrated into the side wall of the first housing 11 (which is the lateral outlet of the built-in microchannel 10). On the main unit side: a second pressure-sensing hole is located on the side wall of the second housing 16 within the measurement space, with an embedded magnetic sealing ring. When the integrated sensing component 18 is inserted, its first pressure-sensing hole 9 and the second pressure-sensing hole automatically align and seal. The pressure sensor is fixed to the internal support of the main unit and connected to the back interface of the second pressure-sensing hole via a PU conduit. The steam pressure transmission path is: distillation chamber 1 → first branch pipe 2 → first outlet end → sealing interface → built-in microchannel 10 → first pressure-sensing hole 9 → second pressure-sensing hole → pressure sensor.

[0038] Furthermore, the heating element is connected to a lifting rod, which is used to control the raising and lowering of the heating element.

[0039] Specifically, the heating wire is a nickel-chromium alloy spiral wire (500W), embedded in a ceramic bracket. The central groove of the bracket is adapted to the spherical bottom of the distillation flask. The heating wire can be raised and lowered to move closer to or further away from the bottom of the distillation flask. The lifting rod is driven by a stepper motor via a coupling, which rotates the lifting rod, causing the heating wire bracket to move up and down along the guide rail with a stroke of 0-50mm, allowing for precise control of the distance between the bottom of the distillation flask and the heating wire.

[0040] In a preferred embodiment, a waste liquid bottle 14 is provided outside the second housing 16, and the waste liquid bottle 14 is connected to the waste liquid outlet.

[0041] Specifically, the waste liquid bottle 14 is a 100ml glass bottle, which is placed in the slot on the side of the main unit. The flow path of the waste liquid is: waste liquid discharge branch pipe 5 → waste liquid outlet → PTFE conduit → inlet of the sealing cap of waste liquid bottle 14 → waste liquid bottle 14.

[0042] In a preferred embodiment, the second housing 16 is provided with a sensor placement rack 19 interface for mounting the sensor placement rack 19, and the integrated sensing assembly 18 can be fixed by inserting the sensor placement rack 19 during the unmeasured stage.

[0043] In a preferred embodiment, the host integrates a touch screen 15 and a data processing module. The touch screen 15 displays the liquid temperature, steam temperature, and steam pressure curves in real time, and the data processing module receives the liquid temperature, steam temperature, and steam pressure data and generates a distillation range curve.

[0044] Specifically, this micro-distillation range determination device, through its unique integrated sensing components 18 precisely positioned at key locations, a distillation flask design with a waste discharge branch pipe 5, and an external protective frame (first protective frame), systematically solves the core problems faced by traditional devices in micro-distillation range determination, such as significant sensor interference, cumbersome operation (especially waste discharge), low safety, and equipment fragility. Its core benefit is achieving high-precision, high-reliability distillation range determination of micro-samples, while significantly improving operational convenience, efficiency, and equipment safety. This meets the growing demand of modern laboratories for micro-volume, high-efficiency, and automated analysis.

[0045] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A micro-distillation range measuring device, characterized in that, include: A distillation flask is provided with a distillation chamber (1) for containing the liquid to be distilled and a first branch pipe (2) connected to the distillation chamber (1). The first branch pipe (2) has a first outlet end and a waste liquid discharge branch pipe (5) is provided on the first branch pipe (2). An integrated sensing component (18) is connected to the first outlet end via a sealed interface. The integrated sensing component (18) includes: Liquid temperature detection unit (3) extends into the distillation chamber (1) below the liquid surface of the liquid to be distilled; Steam temperature detection unit (21) is suspended in the steam area inside the distillation chamber (1); Steam pressure detection unit, used to detect the pressure inside the distillation chamber (1); The first protective frame is fitted over the distillation flask and connected to the integrated sensing component (18) to protect the distillation flask.

2. The micro-distillation range measuring device according to claim 1, characterized in that, The integrated sensing component (18) includes a first housing (11), which has a first space. One end of the liquid temperature detection unit (3) and the steam temperature detection unit (21) are installed in the first space, and the other end of each unit extends out of the first space. A first protective frame is connected to the bottom of the first housing (11), and a sealing interface is installed at the bottom of the first housing (11) and located within the space enclosed by the first protective frame.

3. The micro-distillation range measuring device according to claim 2, characterized in that, The steam pressure detection unit includes a first pressure inlet (9) located on the side wall of the first housing (11) and a built-in microchannel (10) connected to the first pressure inlet (9). The built-in microchannel (10) is used to conduct the pressure of the distillation chamber (1).

4. The micro-distillation range measuring device according to claim 2, characterized in that, The first protective frame includes: The first mounting base (13) is connected to the first housing (11); Multiple first protective rods (7) are arranged in an array around the first branch pipe (2) and are vertically mounted on the first mounting base (13); The first protective ring (6) is connected to the end of the first protective rod (7) away from the first mounting seat (13) and is used to be sleeved on the outer tube wall of the first branch pipe (2) near the distillation chamber (1). The first protective ring (6) has a first clearance end and a second clearance end that are isolated from each other, and a first clearance opening is formed between the first clearance end and the second clearance end. Arc-shaped connecting rod (4) is located at the first clearance opening, with one end connected to the first clearance end and the other end connected to the second clearance end. The arc-shaped connecting rod (4) arches towards the first mounting base (13) to protect the waste liquid discharge branch pipe (5).

5. The micro-distillation range measuring device according to claim 3, characterized in that, It also includes a main unit, which includes a second housing (16), a sensor port on the second housing (16), a measurement space is formed inside the second housing (16), a protective cover (17) hinged to the second housing (16) is provided outside the measurement space, a distillation flask is placed inside the measurement space, and an integrated sensing component (18) is fixed to the sensor port by a plug-in method.

6. The micro-distillation range measuring device according to claim 5, characterized in that, The measurement space is equipped with: Heating wires are located at the bottom of the measuring space and are used to support the distillation flask. Waste liquid outlet is located on the side wall of the second shell (16) in the measurement space and is connected to the waste liquid discharge branch pipe (5); The second pressure port is used to seal and connect with the first pressure port (9) of the integrated sensing assembly (18) to receive pressure signals when the integrated sensing assembly (18) is inserted into the sensor socket. The main unit is equipped with a pressure sensor connected to the second pressure port to detect the pressure in the distillation chamber (1).

7. The micro-distillation range measuring device according to claim 6, characterized in that, The heating element is connected to a lifting rod, which is used to control the raising and lowering of the heating element.

8. The micro-distillation range measuring device according to claim 6, characterized in that, The second housing (16) is provided with a waste liquid bottle (14), which is connected to the waste liquid outlet.

9. The micro-distillation range measuring device according to claim 5, characterized in that, The second housing (16) is provided with a sensor placement rack interface for installing a sensor placement rack (19). The integrated sensing component (18) can be fixed by inserting the sensor placement rack (19) during the unmeasured stage.

10. The micro-distillation range measuring device according to claim 5, characterized in that, It also includes a host integrated touch screen (15) and a data processing module. The touch screen (15) displays the liquid temperature, steam temperature and steam pressure curves in real time. The data processing module receives the liquid temperature, steam temperature and steam pressure data and generates the distillation range curve.

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