Device for testing saturated vapor pressure of substance

Abstract

The utility model provides a device for testing saturated vapor pressure of a substance, which comprises a testing container and a top cover, the top cover is arranged at the upper end of the testing container, the detachable testing container is arranged below the top cover, an airtight pad is arranged at the upper end of the testing container, a first heating plate is arranged on the inner surface of the testing container, and a second heating plate is arranged in the top cover. A heating wire is wound on the outer side of the test container; the top cover is provided with a four-way pipe, the end a of the four-way pipe is communicated with the test container, the end b is communicated with the pressure sensor, the end c is communicated with the vacuum pump, and the end d is communicated with the temperature sensor. The utility model has the beneficial effects that the temperature of a test system is accurately controlled, the heat loss is effectively reduced, a stable heat test environment is formed, and the interference of an external environment on a test result is avoided, so that the reliability of test data is improved. The pressure fluctuation of the test container is avoided, and the accuracy of a test result is further ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of air pressure testing devices, specifically to a device for testing the saturated vapor pressure of a substance. Background Technology

[0002] Saturated vapor pressure is the pressure at which a liquid or solid reaches a state of phase equilibrium with its vapor, and it is one of the fundamental properties of matter. According to the Claber-Paassens-Klauber-Krauthammer equation, in a vacuum-sealed container with a constant temperature, the rates at which vapor molecules condense towards the liquid surface and the rates at which liquid molecules escape from the surface are equal, meaning a dynamic equilibrium is established between the liquid and the vapor. The vapor pressure at this point is the saturated vapor pressure of the substance at that temperature.

[0003] The methods for determining saturated vapor pressure vary depending on the substance and conditions. Commonly used methods include static methods, dynamic methods, saturated gas flow methods, Knudsen gap permeation methods, Reid methods, three-stage expansion methods, and gas chromatography.

[0004] The static method is a commonly used approach that involves placing the analyte in a closed system and directly measuring its saturated vapor pressure at different temperatures. It is the most basic method for measuring vapor pressure, directly measuring the vapor pressure in equilibrium with a liquid or solid phase. However, factors such as air inclusions in the system, temperature fluctuations, or system leaks can lead to pressure instability, preventing the vapor pressure from reaching saturation, resulting in inaccurate pressure gauge readings and making accurate measurements impossible. Therefore, the accuracy of the vapor pressure value cannot be guaranteed.

[0005] Therefore, saturated vapor pressure testing experiments must be conducted in a vacuum-sealed system to ensure constant pressure and temperature. Before the experiment, the experimental system needs to be pressure tested to ensure its airtightness. The system needs to be vacuumed to avoid interference from air on the system temperature. Furthermore, the system temperature should be strictly controlled during the experiment. Utility Model Content

[0006] To address the problem that current devices for testing saturated vapor pressure cannot control the temperature of the system while ensuring airtightness;

[0007] This utility model proposes an apparatus for testing the saturated vapor pressure of a substance, comprising a main body and a top cover, wherein the top cover is disposed on the upper end of the main body;

[0008] A detachable test container is provided below the top cover, and an airtight gasket is provided at the top of the test container. A first heating plate is provided on the inner surface of the main body of the device, a second heating plate is provided inside the top cover, and heating wires are wound around the outside of the test container.

[0009] The top cover is equipped with a four-way pipe, with end a connected to the test container, end b connected to the pressure sensor, end c connected to the vacuum pump, and end d connected to the temperature sensor.

[0010] As a preferred embodiment, the test container includes a connecting pipe and a test pool that are fixedly connected at the top and bottom. The upper end of the connecting pipe is threaded, and a screw hole is provided below the top cover to fit the connecting pipe. The a end of the four-way pipe is located in the screw hole.

[0011] As a preferred embodiment, the heating wire is wound around the outside of the test cell, and an airtight gasket is provided on the outer periphery of the upper end of the connecting pipe.

[0012] As a preferred embodiment, a backflow preventer is provided inside the connecting tube to prevent sample backflow. The backflow preventer is a structure that prevents gas leakage, such as a one-way valve or a mechanical baffle.

[0013] As a preferred embodiment, a valve is installed at the c-end of the four-way pipe to control the vacuum pump.

[0014] As a preferred embodiment, the b-end of the four-way pipe is provided with a piston fitting to buffer the internal pressure.

[0015] As a preferred option, it also includes a PID control center, which is electrically connected to the first heating plate, the second heating plate, and the heating wire to control heating.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. This utility model achieves precise temperature control of the test system by setting a first heating plate, a second heating plate, and a heating wire wound around the outside of the test container. This effectively reduces heat loss, creates a stable thermal test environment, avoids interference from the external environment on the test results, and thus improves the reliability of the test data. By setting a sealing ring at the top of the test container, pressure fluctuations in the test container are avoided, further ensuring the accuracy of the test results.

[0018] 2. This invention, through the design of a four-way tube, achieves connection with pressure sensors, vacuum pumps, and temperature sensors, enabling the direct acquisition of saturated vapor pressure data of materials at multiple temperature points in a single test. This not only saves testing time but also improves testing efficiency, providing convenience for studying the saturated vapor pressure characteristics of materials at different temperatures.

[0019] 3. The device of this utility model is equipped with a backflow blocker in the test container, which can effectively prevent the test material from flowing back during the test, avoid pressure fluctuations caused by material backflow, and further ensure the accuracy of the test results. Attached Figure Description

[0020] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] The numbers in the attached diagram are:

[0023] Based on the above technical solution, the numbered parts are extracted and sorted by number as follows:

[0024] 1. Test container; 11. Connecting pipe; 12. Test cell; 2. Main body of the device; 21. First heating plate; 3. Heating wire; 4. Top cover; 41. Second heating plate; 42. Four-way pipe; 5. Backflow interruptor; 6. Sample temperature sensor; 7. Piston fitting; 8. Pressure sensor; 9. Valve; 10. Vacuum pump. Detailed Implementation

[0025] To illustrate the features of this utility model, the following description, in conjunction with the accompanying drawings and embodiments, will further explain this utility model.

[0026] Example:

[0027] Please see Figure 1 This utility model provides an apparatus for testing the saturated vapor pressure of a substance, including a main body 2 and a top cover 4, with the top cover 4 disposed on the upper end of the main body 2;

[0028] A detachable test container 1 is located below the top cover 4. The specific connection structure is as follows: the test container 1 includes a connecting pipe 11 and a test pool 12 fixedly connected vertically. The upper end of the connecting pipe 11 is threaded, and a screw hole is provided below the top cover 4 to mate with the connecting pipe 11. The a end of the four-way pipe 42 is located inside the screw hole. An airtight gasket is provided at the upper end of the test container 1. A first heating plate 21 is provided on the inner surface of the main body 2 of the device, and a second heating plate 41 is provided inside the top cover 4. A heating wire 3 is wound around the outside of the test container 1, specifically around the outside of the test pool 12. An airtight gasket is provided on the outer periphery of the upper end of the connecting pipe 11. In particular, a PID control center is also included, which is electrically connected to the first heating plate 21, the second heating plate 41, and the heating wire 3 to control heating.

[0029] By setting up a first heating plate, a second heating plate, and heating wires wrapped around the outside of the test container, precise temperature control of the test system is achieved, effectively reducing heat loss and creating a stable thermal testing environment. This avoids interference from the external environment on the test results, thereby improving the reliability of the test data. Furthermore, by installing a sealing ring at the top of the test container, pressure fluctuations are prevented, further ensuring the accuracy of the test results.

[0030] The top cover 4 is equipped with a four-way pipe 42. End a of the four-way pipe 42 is connected to the test container 1, end b to the pressure sensor 8, end c to the vacuum pump 10, and end d to the temperature sensor 6. This four-way pipe design enables connection to the pressure sensor, vacuum pump, and temperature sensor, allowing for the direct acquisition of saturated vapor pressure data of the material at multiple temperature points in a single test. This not only saves testing time but also improves testing efficiency, providing convenience for studying the saturated vapor pressure characteristics of materials at different temperatures.

[0031] Preferably, in this embodiment, a backflow preventer 5 is provided inside the connecting pipe 11 to prevent sample backflow. This effectively prevents the test material from flowing back during the test, avoids pressure fluctuations caused by material backflow, and further ensures the accuracy of the test results.

[0032] Preferably, in this embodiment, a valve 9 is provided at end c of the four-way pipe 42 to control the vacuum pump 10.

[0033] Preferably, in this embodiment, a piston fitting 7 is provided at end b of the four-way pipe 42 to buffer the internal pressure.

[0034] The above embodiments and accompanying drawings are only used to illustrate the technical solutions of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions, or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model. Other related technical structures not disclosed in detail in this utility model are existing technologies in the art.

Claims

1. A device for testing saturated vapor pressure of a substance, comprising a device body (2) and a top cover (4) arranged on the upper end of the device body (2), characterized in that: a detachable test container (1) is arranged below the top cover (4), an airtight gasket is arranged on the upper end of the test container (1), a first heating plate (21) is arranged on the inner surface of the device body (2), a second heating plate (41) is arranged inside the top cover (4), and a heating wire (3) is wound outside the test container (1); The top cover (4) is provided with a four-way pipe (42), the a end of the four-way pipe (42) is communicated with the test container (1), the b end is communicated with a pressure sensor (8), the c end is communicated with a vacuum pump (10), and the d end is communicated with a temperature sensor (6). The test container (1) comprises a connecting pipe (11) and a test pool (12) fixedly connected in sequence, a thread is arranged on the upper end of the connecting pipe (11), a screw hole is arranged below the top cover (4) to match the connecting pipe (11), and the a end of the four-way pipe (42) is arranged in the screw hole.

2. The apparatus for testing the saturated vapor pressure of a substance according to claim 1, characterized by: The heating wire (3) is wound outside the test pool (12), and an airtight gasket is arranged on the outer periphery of the upper end of the connecting pipe (11).

3. The apparatus for testing the saturated vapor pressure of a substance according to claim 2, wherein: A backflow blocker (5) is arranged in the connecting pipe (11) to prevent backflow of the sample.

4. The apparatus for testing the saturated vapor pressure of a substance according to claim 2, wherein: A valve (9) is arranged at the c end of the four-way pipe (42) to control the vacuum pump (10).

5. The apparatus for testing the vapor pressure of a substance according to claim 1, wherein: A piston pipe (7) is arranged at the b end of the four-way pipe (42) to buffer the internal pressure.

6. The apparatus for testing the saturated vapor pressure of a substance according to claim 1, wherein: A PID control center is further included, and the PID control center is electrically connected with the first heating plate (21), the second heating plate (41) and the heating wire (3) to control heating.

7. The apparatus for testing the vapor pressure of a substance according to claim 1, wherein: ​

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