Performance test platform for low-temperature Stirling cycle

Abstract

The utility model provides a low-temperature Stirling cycle performance test platform which comprises a low-temperature Stirling heat engine and further comprises a heat preservation barrel, hot water with a preset amount of temperature is contained in the heat preservation barrel, a bearing table is arranged in the heat preservation barrel in an up-down sliding mode, and the low-temperature Stirling heat engine is placed on the bearing table. The measuring module comprises a pressure intensity sensor, and the pressure intensity sensor is arranged on an exhaust port of an air cylinder of the low-temperature Stirling heat engine in a threaded connection mode; the displacement sensor is arranged on the heat preservation barrel through a fixing support and located above the low-temperature Stirling heat engine, and an acquisition window of the displacement sensor points to the surface of the upper end of a piston of the low-temperature Stirling heat engine; the temperature sensor is arranged on the heat preservation barrel through a fixing support, and an acquisition head of the temperature sensor is located in the heat preservation barrel.

Description

Technical Field

[0001] The utility model relates to the technical field of physical experiment instrument testing equipment, in particular to a low-temperature Stirling cycle performance testing platform. Background Art

[0002] A Stirling heat engine is a piston-type heat engine based on the Stirling cycle. The ideal Stirling cycle consists of four processes: isothermal expansion, isochoric cooling, isothermal compression, and isochoric heating. The Stirling heat engine operates according to this four-process cycle.

[0003] Stirling heat engines play a crucial role in thermal science teaching, including understanding their working principles, demonstrating heat engine cycles, and measuring their power and efficiency. Traditional Stirling heat engines only provide a graph showing the relationship between gas pressure and cylinder volume, but are unable to comprehensively test and evaluate other physical properties of the Stirling engine. Utility Model Content

[0004] To solve the above problems, the present invention provides a low-temperature Stirling cycle performance test platform, which is implemented as follows:

[0005] A performance testing platform for a low-temperature Stirling cycle, comprising a low-temperature Stirling heat engine, and further comprising:

[0006] A heat preservation barrel, wherein the heat preservation barrel contains hot water of a predetermined temperature, wherein a supporting platform is provided in the heat preservation barrel so as to slide up and down, and the low-temperature Stirling heat engine is placed on the supporting platform;

[0007] A measurement module, comprising:

[0008] a pressure sensor, the pressure sensor being threadedly connected to the exhaust port of the cylinder of the low-temperature Stirling heat engine;

[0009] a displacement sensor, the displacement sensor being located above the low-temperature Stirling heat engine, and a collection window of the displacement sensor pointing toward an upper end surface of a piston of the low-temperature Stirling heat engine;

[0010] A temperature sensor, wherein the collecting head of the temperature sensor is located in the heat preservation barrel.

[0011] As a further improvement, the supporting platform is made of a hard material and is provided with a plurality of mesh holes through which steam or water can pass.

[0012] As a further improvement, an adjustment platform is provided in the heat preservation barrel, a screw rod is rotatably provided on the adjustment platform, the screw rod is threadedly connected to the supporting platform, and the supporting platform adjusts the upper and lower positions by rotating the screw rod.

[0013] As a further improvement, the collection head of the temperature sensor includes a steam temperature collection head arranged on the lower end surface of the supporting platform and a water temperature collection head arranged on the bottom of the insulation barrel.

[0014] The beneficial effects of the present invention are:

[0015] By setting up pressure sensors, displacement sensors and temperature sensors, during the experiment, the volume change of the cylinder is measured by using the displacement sensor, which is then converted into gas volume change data. This avoids the low precision problem caused by the traditional spiral winding method, improves the measurement accuracy, and provides more accurate control over the performance of the experimental instrument.

[0016] In addition to outputting pV images, the sensor can also output Wt images, Pt images, and η-t images. This provides a more comprehensive detection dimension for the experimental instrument being tested, can more effectively discover problems with the experimental instrument being tested, and can provide more timely feedback and make corresponding optimization adjustments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the explosion structure of the utility model.

[0018] Figure 2 This is a schematic diagram of the overall structure of the low-temperature Stirling heat engine of the present invention.

[0019] Figure 3 It is a schematic cross-sectional view of the heat preservation barrel of the present invention.

[0020] Figure 4 The pV image drawn for the embodiment of the utility model;

[0021] Figure 5 The Wt image drawn for the embodiment of the present utility model;

[0022] Figure 6 The Pt image drawn for the embodiment of the present invention;

[0023] Figure 7 The η-t image drawn for the embodiment of the present utility model. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for which protection is claimed, but merely represents selected embodiments of the present invention.

[0025] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, the terms "first" and "second" may explicitly or implicitly include one or more of the features.

[0026] A performance testing platform for a low-temperature Stirling cycle includes a low-temperature Stirling heat engine 1 and further includes:

[0027] A heat preservation barrel 2, wherein hot water of a predetermined temperature is contained in the heat preservation barrel 2, a supporting platform 21 is provided in the heat preservation barrel 2 so as to slide up and down, and the low-temperature Stirling heat engine 1 is placed on the supporting platform 21;

[0028] A measurement module, comprising:

[0029] A pressure sensor 31 is provided on the exhaust port 13 of the cylinder 11 of the low-temperature Stirling heat engine 1 through a threaded connection;

[0030] a displacement sensor 32 , the displacement sensor 32 being located above the low-temperature Stirling heat engine 1 , and a collection window of the displacement sensor 32 pointing toward the upper end surface of the piston 12 of the low-temperature Stirling heat engine 1 ;

[0031] The temperature sensor 33 has a collection head located in the heat preservation barrel 2 .

[0032] Furthermore, it also includes a data processing module, which is communicatively connected to the measurement modules and is used to receive data signals collected by each sensor in the measurement module.

[0033] Optionally, a fixing bracket can be provided on the outer periphery of the heat preservation barrel 2 to fix the displacement sensor 32 and the temperature sensor 33. Alternatively, the displacement bed and the temperature sensor 33 can be fixed by other independent brackets.

[0034] As a further improvement, the support platform 21 is made of a hard material and has a number of mesh holes that allow steam or water to pass through. By providing the support platform 21 and the mesh holes, the position of the low-temperature Stirling heat engine 1 being tested in the insulation barrel 2 can be adjusted, and it can be immersed in water or heated only by hot water steam. Because water has a high specific heat capacity and a small temperature fluctuation range, other parameters and performance tests to be tested are more accurate when tested immersed in water; when located on the water surface and heated by steam, more test environments can be provided for corresponding comparisons, providing a wider range of test dimensions for the performance of the equipment to be tested.

[0035] As a further improvement, an adjustment platform 22 is provided in the heat preservation barrel 2 , a screw rod 23 is rotatably provided on the adjustment platform 22 , the screw rod 23 is threadedly connected to the supporting platform 21 , and the supporting platform 21 is adjusted in up and down position by the rotation of the screw rod 23 .

[0036] As a further improvement, the collection head of the temperature sensor 33 includes a steam temperature collection head arranged on the lower end surface of the supporting platform 21 and a water temperature collection head arranged on the bottom of the heat preservation barrel 2.

[0037] In combination with the above content, the specific testing process of the utility model includes the following steps:

[0038] S1. Assembling a measuring sensor, the measuring sensor includes a pressure sensor 31, a displacement sensor 32 and a temperature sensor 33;

[0039] S2. Inject a predetermined amount of water at a predetermined temperature into the insulation barrel 2;

[0040] S3. Open the DAM3000M measurement and control system in the computer, the gas pressure p and volume V, the real-time water temperature T is measured by the pressure sensor 31, the displacement sensor 32 and the temperature sensor 33. During the process, the data acquisition card automatically collects gas pressure, displacement, and water temperature data and saves them in the form of csV files in the computer;

[0041] S4. Save the csv file in Excel format and use Python to read the displacement and pressure data in the Excel file. The data from the displacement sensor 32 can be converted into gas volume. The pressure p is plotted against the gas volume V and recorded as a pV graph.

[0042] S5. Using theoretical formulas, calculate the gas work W, output power P, and heat engine efficiency in Python. Graph the gas work W versus time t (Wt graph), the output power P versus time t (Pt graph), and the heat engine efficiency η versus time t (η-t graph).

[0043] S6. Perform performance analysis based on the pV image, Wt image, Pt image, and η-t image.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A performance test platform for a low-temperature Stirling cycle, comprising a low-temperature Stirling heat engine, characterized in that: Also includes: A heat preservation barrel, wherein the heat preservation barrel contains hot water of a predetermined temperature, wherein a supporting platform is provided in the heat preservation barrel so as to slide up and down, and the low-temperature Stirling heat engine is placed on the supporting platform; A measurement module, comprising: a pressure sensor, the pressure sensor being threadedly connected to the exhaust port of the cylinder of the low-temperature Stirling heat engine; a displacement sensor, the displacement sensor being located above the low-temperature Stirling heat engine, and a collection window of the displacement sensor pointing toward an upper end surface of a piston of the low-temperature Stirling heat engine; A temperature sensor, wherein the collecting head of the temperature sensor is located in the heat preservation barrel.

2. A low-temperature Stirling cycle performance testing platform as claimed in claim 1, characterized in that: The supporting platform is made of hard material and is provided with a plurality of mesh holes through which steam or water can pass.

3. A low-temperature Stirling cycle performance testing platform as claimed in claim 2, characterized in that: An adjustment platform is provided in the heat preservation barrel. A screw rod is rotatably provided on the adjustment platform. The screw rod is threadedly connected to the supporting platform. The upper and lower positions of the supporting platform are adjusted by rotating the screw rod.

4. A low-temperature Stirling cycle performance testing platform as claimed in claim 2, characterized in that: The collection head of the temperature sensor includes a steam temperature collection head arranged on the lower end surface of the supporting platform and a water temperature collection head arranged on the bottom of the heat preservation barrel.

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