Simple experimental device for measuring heat conductivity coefficient of liquid

Abstract

The invention discloses an experimental device for simply measuring the heat conductivity coefficient of liquid, comprising: a bottom plate, the top surface of which is provided with a support frame; the constant-temperature box is fixed on the top surface of the bottom plate, and the top of the constant-temperature box is detachably connected with a top cover; the four groups of side surrounding plates are arranged in the constant-temperature box; the base plate comprises an upper base plate and a lower base plate; four groups of temperature measuring columns are arranged, and the temperature measuring columns are vertically arranged between the upper base plate and the lower base plate; the temperature measuring system comprises a bearing frame and a mounting plate, a pressing rod is mounted on the bearing frame, a plurality of thermocouples are mounted on the mounting plate, the thermocouples correspond to the temperature measuring columns respectively, and the thermocouples are connected with the control system; a liquid filling bag is arranged between the surrounding plate and the temperature measuring column, and the liquid filling bag is connected with the liquid supply system; and heaters are respectively arranged on the coamings. According to the invention, multiple groups of independent temperature measuring columns and liquid filling bags are matched to carry out a variable control experiment, so that the application range of the device is widened.

Description

Technical Field

[0001] The invention relates to the technical field of experimental equipment, in particular to an experimental device for simply measuring the thermal conductivity of liquid. Background Art

[0002] Liquid thermal conductivity (also known as thermal conductivity) is a physical quantity that measures the ability of a liquid to conduct heat. It is defined as:

[0003] Under stable heat transfer conditions, when the temperature difference between the two surfaces of a 1-meter-thick liquid material is 1 Kelvin (K), the amount of heat transferred through an area of 1 square meter per unit time is measured in watts per meter Kelvin (W / (m·K)).

[0004] The mathematical expression is:

[0005]

[0006] q is the heat flux, λ is the thermal conductivity, ΔT is the temperature difference, and Δx is the material thickness.

[0007] The greater the thermal conductivity, the greater the liquid's ability to conduct heat. Thermal conductivity is an inherent physical property of liquids and is closely related to factors such as the type, structure, temperature, and pressure of the substance.

[0008] Methods for measuring the thermal conductivity of liquids include steady-state, unsteady-state, heat pipe, and comparative methods. The most commonly used method is the steady-state method. The steady-state method typically involves a cold surface and a hot surface, with a liquid placed between them. The liquid is clamped between two hot plates. After heating, temperature data is collected using thermocouples, ultimately leading to thermal conductivity calculation. Existing thermal conductivity measurement devices can only measure a single liquid and are unable to perform comparative experiments on multiple liquids or a single liquid under different pressures. Therefore, the present invention provides a simple experimental device for measuring the thermal conductivity of liquids. Summary of the Invention

[0009] The purpose of the present invention is to provide a simple experimental device for measuring the thermal conductivity of liquid to solve the problems existing in the prior art.

[0010] To achieve the above object, the present invention provides the following solution: The present invention provides a simple experimental device for measuring the thermal conductivity of liquid, comprising:

[0011] A bottom plate, a support frame being installed on the top surface of the bottom plate;

[0012] A constant temperature box, the constant temperature box is fixed to the top surface of the bottom plate, and the top of the constant temperature box is detachably connected to a top cover;

[0013] Side panels, wherein four groups of side panels are provided in the constant temperature box, and the four groups of side panels together form a rectangular frame structure;

[0014] A pad, the pad comprising an upper pad and a lower pad, the upper pad abutting against the top cover, the lower pad abutting against the bottom wall of the thermostat, and the four sets of side panels being located between the upper pad and the lower pad;

[0015] Temperature measuring columns, wherein four groups of temperature measuring columns are provided, and the cross-sectional shapes of the four groups of temperature measuring columns are all isosceles trapezoidal, and the temperature measuring columns are vertically arranged between the upper pad and the lower pad;

[0016] A temperature measurement system, comprising a carrier frame and a mounting plate, wherein the carrier frame is mounted on the support frame, the mounting plate is disposed between the temperature measuring column and the upper pad, a pressure rod is mounted on the carrier frame, one end of the pressure rod passes through the top cover and the upper pad and abuts against the mounting plate, a plurality of thermocouples are mounted on the mounting plate, the plurality of thermocouples are respectively disposed corresponding to the plurality of temperature measuring columns, and the thermocouples are connected to a control system;

[0017] A liquid supply system, wherein a liquid-filled bag is provided between the enclosure and the temperature measuring column, and the liquid-filled bag is connected to the liquid supply system;

[0018] Wherein, heaters are respectively installed on the enclosures.

[0019] According to the simple experimental device for measuring the thermal conductivity of liquid provided by the present invention, partitions are fixedly connected to opposite sides of the side panels, the partitions are isosceles trapezoidal structures, and are arranged at an angle of 45° to the side panels.

[0020] According to the simple experimental device for measuring the thermal conductivity of liquid provided by the present invention, the support frame includes columns and beams, the columns are provided in two groups, the two groups of columns are symmetrically and vertically fixedly connected to the top surface of the base plate, the beams are horizontally fixedly connected to the top of the columns, and the supporting frame is installed on the beams.

[0021] According to the simple experimental device for measuring the thermal conductivity of liquid provided by the present invention, the supporting frame includes an upper mounting frame and a lower mounting frame, and the upper mounting frame and the lower mounting frame are respectively arranged on the upper and lower sides of the cross beam, the upper mounting frame is vertically fixedly connected with a sliding rod, the lower mounting frame and the sliding rod are slidably connected, a spring is fixed between the lower mounting frame and the cross beam, the spring is sleeved on the sliding rod, the pressure rod is vertically fixedly connected to the lower mounting frame, a bracket is fixed on the top of the cross beam, a hydraulic push rod is fixed on the top of the bracket, and the top of the hydraulic push rod is vertically fixedly connected to the upper mounting frame.

[0022] According to the simple experimental device for measuring the thermal conductivity of liquid provided by the present invention, a temperature measuring hole is opened on the top of the temperature measuring column, and the thermocouple is placed in the temperature measuring hole.

[0023] According to the simple experimental device for measuring the thermal conductivity of liquid provided by the present invention, the liquid supply system includes a liquid storage tank, and a plurality of delivery pipes are fixedly connected to the liquid storage tank. The plurality of delivery pipes respectively pass through the constant temperature box and the enclosure and are connected to the liquid filling bag, and a pressure pump is installed on the delivery pipe.

[0024] According to the simple experimental device for measuring the thermal conductivity of liquid provided by the present invention, thermal insulation pads are respectively provided between the mounting plate and the temperature measuring column, and between the lower plate and the temperature measuring column.

[0025] According to the simple experimental device for measuring the thermal conductivity of liquid provided by the present invention, the top cover and the constant temperature box are detachably connected via positioning screws.

[0026] The present invention discloses the following technical effects:

[0027] Improve measurement accuracy by optimizing the cross-sectional shape of the temperature measuring column, increasing the contact area with the liquid, and improving the accuracy and sensitivity of temperature measurement.

[0028] The use of a liquid-filled capsule can ensure that the liquid remains stable during the temperature measurement process, reducing measurement errors caused by liquid flow or fluctuations.

[0029] Use high-precision thermocouples and advanced control systems to ensure the accuracy and real-time nature of temperature data.

[0030] Enhance experimental flexibility, the detachable design of the constant temperature box and top cover makes it easy to replace the liquid to be tested and perform cleaning and maintenance.

[0031] The connection design between the liquid filling capsule and the liquid supply system allows the experimenter to easily replace different types of liquids for testing.

[0032] Realize automated measurement, realize automatic collection and processing of temperature data through the control system, reduce manual operation errors and improve experimental efficiency.

[0033] Data analysis software can be further integrated to automatically calculate thermal conductivity and generate experimental reports.

[0034] By using multiple sets of independent temperature measuring columns and liquid-filled capsules, controlled variable experiments can be carried out, thereby improving the applicability of the device.

[0035] To expand the scope of application, this experimental device is not only suitable for measuring the thermal conductivity of liquids, but can also be used to measure other thermophysical properties or conduct other related experiments by adjusting the design of the temperature measuring column and liquid-filled capsule. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 This is an axonometric diagram of an experimental device for simply measuring the thermal conductivity of liquid according to the present invention;

[0038] Figure 2 This is a front view of an experimental device for simply measuring the thermal conductivity of liquid according to the present invention;

[0039] Figure 3 It is a top view of the thermostat of the present invention.

[0040] Among them, 1. bottom plate; 2. constant temperature box; 3. top cover; 4. side panel; 5. upper pad; 6. lower pad; 7. temperature measuring column; 8. mounting plate; 9. pressure rod; 10. partition; 11. column; 12. crossbeam; 13. upper mounting frame; 14. lower mounting frame; 15. sliding rod; 16. spring; 17. bracket; 18. hydraulic push rod; 19. temperature measuring hole; 20. liquid storage tank; 21. delivery pipe; 22. positioning screw; 23. thermal insulation pad. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] Reference Figure 1-3 The present invention provides a simple experimental device for measuring the thermal conductivity of liquid, comprising:

[0044] Base plate 1, with a support frame installed on the top surface of base plate 1;

[0045] The thermostat 2 is fixed to the top surface of the bottom plate 1, and a top cover 3 is detachably connected to the top of the thermostat 2;

[0046] Side panels 4, four groups of side panels 4 are provided in the constant temperature box 2, and the four groups of side panels 4 together form a rectangular frame structure;

[0047] The pads include an upper pad 5 and a lower pad 6. The upper pad 5 abuts against the top cover 3, and the lower pad 6 abuts against the bottom wall of the thermostat 2. The four sets of side panels 4 are located between the upper pad 5 and the lower pad 6.

[0048] Temperature measuring columns 7, there are four groups of temperature measuring columns 7, the cross-sectional shape of the four groups of temperature measuring columns 7 are all isosceles trapezoidal, and the temperature measuring columns 7 are vertically arranged between the upper pad 5 and the lower pad 6;

[0049] The temperature measurement system includes a carrier frame and a mounting plate 8. The carrier frame is installed on the support frame. The mounting plate 8 is arranged between the temperature measuring column 7 and the upper pad 5. A pressure rod 9 is installed on the carrier frame. One end of the pressure rod 9 passes through the top cover 3 and the upper pad 5 and abuts against the mounting plate 8. A plurality of thermocouples are installed on the mounting plate 8. The plurality of thermocouples are respectively arranged corresponding to the plurality of temperature measuring columns 7. The thermocouples are connected to the control system.

[0050] Liquid supply system, a liquid filling bag is provided between the enclosure and the temperature measuring column 7, and the liquid filling bag is connected to the liquid supply system;

[0051] Among them, heaters are respectively installed on the enclosures.

[0052] When the present invention is working, place the experimental device on a horizontal ground to ensure that the bottom plate 1 is stable. Install the top cover 3 of the thermostat 2 and ensure that it is well sealed to prevent heat loss. Install a heater on the side panel 4 and connect the power supply and control circuits. Place the liquid-filled bag between the panel and the temperature measuring column 7, and inject different pressures and / or different types of liquids to be tested through the liquid supply system. Install the carrier frame of the temperature measuring system on the support frame, and adjust the position of the pressure rod 9 so that it can be pressed evenly and stably on the mounting plate 8. Install the thermocouple on the mounting plate 8 and ensure that it corresponds one-to-one with the temperature measuring column 7, and connect the thermocouple and the control system circuit. Start the heater to heat the liquid in the thermostat 2. The power and heating time of the heater can be adjusted according to the experimental requirements. At the same time, start the temperature measuring system, and the control system begins to record the temperature data transmitted by the thermocouple. Since the cross-sectional shape of the temperature measuring column 7 is an isosceles trapezoid, the contact area with the liquid is increased, thereby improving the accuracy of the temperature measurement. During the heating process, the liquid expands due to the heat, but due to the restraining effect of the liquid-filled bladder, the liquid forms a stable heat conduction environment around the temperature measuring column 7. The control system calculates the liquid's temperature distribution and thermal conductivity in real time based on the temperature data transmitted by the thermocouples. After the heating and temperature measurement phases are completed, the heater and temperature measurement system are turned off. The temperature data is exported from the control system for processing and analysis. Using heat conduction theory and analytical methods, the thermal conductivity of the liquid is calculated from the temperature data. Based on these experimental results, the thermal conductivity of the liquid can be evaluated and compared.

[0053] As a further optimization, partitions 10 are fixedly connected to opposite sides of the side panels 4. These partitions 10 are isosceles trapezoidal in shape and arranged at a 45° angle to the side panels 4. The placement of partitions 10 prevents interference between adjacent liquid-filled bladders, ensuring the relative independence of the experiments.

[0054] To further optimize the solution, the support frame includes columns 11 and beams 12. There are two groups of columns 11. The two groups of columns 11 are symmetrically and vertically fixedly connected to the top surface of the base plate 1. The beams 12 are horizontally fixedly connected to the top of the columns 11, and the load-bearing frame is installed on the beams 12.

[0055] To further optimize the solution, the load-bearing frame includes an upper mounting frame 13 and a lower mounting frame 14, and the upper mounting frame 13 and the lower mounting frame 14 are respectively arranged on the upper and lower sides of the beam 12, and a sliding rod 15 is vertically fixedly connected to the upper mounting frame 13, and the lower mounting frame 14 is slidably connected to the sliding rod 15, and a spring 16 is fixed between the lower mounting frame 14 and the beam 12, and the spring 16 is sleeved on the sliding rod 15, and the pressure rod 9 is vertically fixedly connected to the lower mounting frame 14, and a bracket 17 is fixed on the top of the beam 12, and a hydraulic push rod 18 is fixedly connected to the top of the bracket 17, and the top of the hydraulic push rod 18 is vertically fixedly connected to the upper mounting frame 13.

[0056] The support frame consists of an upper mounting frame 13 and a lower mounting frame 14, respectively positioned above and below the crossbeam 12. The upper mounting frame 13 is slidably connected to the lower mounting frame 14 via a slide bar 15, while the lower mounting frame 14 is fixedly connected to the crossbeam 12 via a spring 16. The spring 16, mounted on the slide bar 15, provides an upward spring force to the lower mounting frame 14 while also allowing it to slide up and down on the slide bar 15. A pressure rod 9 is vertically fixed to the lower mounting frame 14, transmitting force to the mounting plate 8 and thermocouple, ensuring close contact between them and the temperature measuring column 7. When the experiment begins, the liquid supply system injects the test liquid into the liquid-filled bladder. Subsequently, the hydraulic push rod 18 begins operating, pushing the lower mounting frame 14 and pressure rod 9 downward until they are in close contact with the mounting plate 8 and thermocouple. During this process, the spring 16 is compressed, providing a stable support force for the lower mounting frame 14 and pressure rod 9. As the pressure rod 9 moves downward, the contact pressure between the mounting plate 8 and the thermocouple and the temperature measuring column 7 gradually increases, ensuring that the thermocouple can accurately measure the temperature of the temperature measuring column 7.

[0057] The top end of the hydraulic push rod 18 is vertically fixedly connected to the upper mounting frame 13, and the bottom end of the hydraulic push rod 18 is fixed to the top of the crossbeam 12 through the bracket 17. The hydraulic push rod 18 is used to adjust the relative position between the upper mounting frame 13 and the lower mounting frame 14, thereby achieving precise control of the pressure applied to the pressure rod 9.

[0058] To further optimize the solution, a temperature measuring hole 19 is opened on the top of the temperature measuring column 7, and a thermocouple is placed in the temperature measuring hole 19.

[0059] According to a further optimization scheme, the liquid supply system includes a liquid storage tank 20 , to which a plurality of delivery pipes 21 are fixedly connected. The plurality of delivery pipes 21 pass through the constant temperature box 2 and the enclosure and are connected to the liquid filling bag, and a pressure pump is installed on the delivery pipe 21 .

[0060] To further optimize the solution, thermal insulation pads 23 are respectively provided between the mounting plate 8 and the temperature measuring column 7 and between the lower pad 6 and the temperature measuring column 7 .

[0061] According to a further optimized solution, the top cover 3 and the thermostat box 2 are detachably connected via positioning screws 22 .

[0062] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying 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 a limitation on the present invention.

[0063] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A simple experimental device for measuring the thermal conductivity of liquid, characterized in that: include: A base plate (1), wherein a support frame is installed on the top surface of the base plate (1); A constant temperature box (2), the constant temperature box (2) being fixed on the top surface of the bottom plate (1), and a top cover (3) being detachably connected to the top of the constant temperature box (2); Side panels (4), four groups of side panels (4) are provided in the constant temperature box (2), and the four groups of side panels (4) are combined to form a rectangular frame structure; A pad, the pad comprising an upper pad (5) and a lower pad (6), the upper pad (5) abutting against the top cover (3), the lower pad (6) abutting against the bottom wall of the thermostatic box (2), and the four groups of side panels (4) are all located between the upper pad (5) and the lower pad (6); Temperature measuring columns (7), wherein four groups of the temperature measuring columns (7) are provided, and the cross-sectional shapes of the four groups of the temperature measuring columns (7) are all isosceles trapezoidal, and the temperature measuring columns (7) are vertically arranged between the upper pad (5) and the lower pad (6); A temperature measurement system, comprising a carrier frame and a mounting plate (8), wherein the carrier frame is mounted on the support frame, the mounting plate (8) is arranged between the temperature measuring column (7) and the upper pad (5), a pressure rod (9) is mounted on the carrier frame, one end of the pressure rod (9) passes through the top cover (3) and the upper pad (5) and abuts against the mounting plate (8), a plurality of thermocouples are mounted on the mounting plate (8), the plurality of thermocouples are respectively arranged corresponding to the plurality of temperature measuring columns (7), and the thermocouples are connected to a control system; A liquid supply system, wherein a liquid filling bag is provided between the enclosure and the temperature measuring column (7), and the liquid filling bag is connected to the liquid supply system; Wherein, heaters are respectively installed on the enclosures.

2. The experimental device for measuring the thermal conductivity of liquid according to claim 1, characterized in that: The side panels (4) are fixedly connected to partitions (10) on opposite sides, respectively. The partitions (10) are isosceles trapezoidal structures, and the partitions (10) are arranged at an angle of 45° to the side panels (4).

3. The experimental device for measuring the thermal conductivity of liquid according to claim 1, characterized in that: The support frame comprises columns (11) and crossbeams (12), wherein the columns (11) are provided in two groups, the two groups of columns (11) are symmetrically and vertically fixedly connected to the top surface of the base plate (1), the crossbeams (12) are horizontally fixedly connected to the tops of the columns (11), and the bearing frame is mounted on the crossbeams (12).

4. The experimental device for measuring the thermal conductivity of liquid according to claim 3, characterized in that: The bearing frame includes an upper mounting frame (13) and a lower mounting frame (14), the upper mounting frame (13) and the lower mounting frame (14) are respectively arranged on the upper and lower sides of the beam (12), a sliding rod (15) is vertically fixedly connected to the upper mounting frame (13), the lower mounting frame (14) and the sliding rod (15) are slidably connected, a spring (16) is fixed between the lower mounting frame (14) and the beam (12), the spring (16) is sleeved on the sliding rod (15), the pressure rod (9) is vertically fixedly connected to the lower mounting frame (14), a bracket (17) is fixed on the top of the beam (12), a hydraulic push rod (18) is fixedly connected to the top of the bracket (17), and the top of the hydraulic push rod (18) is vertically fixedly connected to the upper mounting frame (13).

5. The experimental device for measuring the thermal conductivity of liquid according to claim 1, characterized in that: A temperature measuring hole (19) is provided on the top of the temperature measuring column (7), and the thermocouple is placed in the temperature measuring hole (19).

6. The experimental device for measuring the thermal conductivity of liquid according to claim 1, characterized in that: The liquid supply system comprises a liquid storage tank (20), a plurality of delivery pipes (21) are fixedly connected to the liquid storage tank (20), the plurality of delivery pipes (21) respectively pass through the constant temperature box (2), the enclosure plate and are connected to the liquid filling bag, and a pressure pump is installed on the delivery pipes (21).

7. The experimental device for measuring the thermal conductivity of liquid according to claim 1, characterized in that: A heat insulation pad (23) is provided between the mounting plate (8) and the temperature measuring column (7), and between the lower pad (6) and the temperature measuring column (7).

8. The experimental device for measuring the thermal conductivity of liquid according to claim 1, characterized in that: The top cover (3) and the constant temperature box (2) are detachably connected via positioning screws (22).

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