Device for measuring power of Stirling engine model and control system

Abstract

The invention relates to the technical field of Stirling engine model measurement, in particular to a device for measuring the power of a Stirling engine model and a control system.The device for measuring the power of the Stirling engine model comprises a supporting mechanism, a conversion mechanism, an adjusting mechanism and an electronic scale; the control system comprises two groups of direct-current power supplies, a heating end temperature control unit, a cooling end temperature control unit and an electrodynamic torque meter circuit unit; the Stirling engine model and the testing device are combined and assembled, so that the power efficiency can be conveniently and accurately measured; through cooperation of the Stirling engine model and the control system, the cold and heat source temperature can be conveniently and accurately controlled, and meanwhile the problem that the Stirling engine model is overheated after running for a long time is solved.

Description

Technical Field

[0001] The invention relates to the technical field of Stirling engine model measurement, in particular to a device and a control system for measuring the power of a Stirling engine model. Background Art

[0002] The Stirling engine model is a heat engine that generates mechanical work by expanding and compressing a working gas driven by an external heat source. It usually consists of two main parts: a hot end and a cold end, between which the working gas circulates, absorbing heat energy and converting it into mechanical energy. The working principle of the Stirling engine is based on the Stirling cycle, which realizes the mutual conversion between thermal energy and mechanical energy through the process of heating, expansion, cooling and compression of the gas.

[0003] The main advantage of the Stirling engine is its efficient heat energy conversion capability, especially when the external heat source is stable, its thermal efficiency can be close to the Carnot efficiency. This makes the Stirling engine have broad application prospects in some applications that require efficient thermal energy utilization, such as micro-generation, portable energy systems and aerospace. In addition, the Stirling engine is relatively compact and low-noise, suitable for scenarios that require quiet and stable power output.

[0004] However, the power of Stirling engine models is usually low, generally between a few milliwatts and hundreds of milliwatts. This low power level poses a significant challenge to power measurement. Due to the small power variation range, existing measurement technologies often have difficulty capturing such small fluctuations, especially in real-time monitoring and precise measurement, where there may be certain errors. Therefore, it is particularly important to develop high-precision and high-sensitivity power measurement equipment in order to accurately reflect the output power of the Stirling engine under different working conditions.

[0005] At the same time, the Stirling engine model is popular in various applications due to its compact design, especially in environments with limited space. However, this small size also brings some challenges to design and use. First, due to the small size of the engine, its heat dissipation capacity is relatively limited. After working for a long time, the temperature of the engine case may increase significantly, leading to overheating problems. High temperature not only affects the performance of the engine, reducing its power output and thermal efficiency, but may also cause thermal damage to the material. Long-term high temperature working environment may cause material aging, deformation or embrittlement, further reducing the service life of the engine. Therefore, how to effectively control heat and improve heat dissipation performance while ensuring a compact design is the key to improving the reliability of the Stirling engine and extending its service life. Summary of the invention

[0006] In view of the problem in the prior art that the power of the Stirling engine model cannot be accurately measured, the present invention is proposed.

[0007] Therefore, an object of the present invention is to provide a device for measuring the power of a Stirling engine model.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: a device for measuring the power of a Stirling engine model, comprising a supporting mechanism, a conversion mechanism, an adjusting mechanism and an electronic scale;

[0009] The support mechanism includes a bottom plate and a support frame fixedly connected to the top of the bottom plate, the conversion mechanism is adapted to be installed on the inner side of the support frame, the adjustment mechanism is adapted to be installed on the outer side of the conversion mechanism, and the electronic scale is adapted to be installed on the top of the bottom plate;

[0010] The adjusting mechanism comprises an adjusting force arm and an adjusting pressure rod, and the adjusting pressure rod is slidably connected inside the adjusting force arm.

[0011] As a preferred solution of the device for measuring the power of a Stirling engine model of the present invention, the support frame includes a support plate fixedly connected to the top of the base plate, side plates fixedly connected to both sides of the support plate, and bearings adapted to be installed on the inner sides of the two groups of side plates.

[0012] As a preferred solution of the device for measuring the power of the Stirling engine model of the present invention, wherein: the conversion mechanism comprises a low-resistance DC motor adapted to be mounted on the outer side of a group of the side plates, a rotating shaft fixedly connected to the output end of the low-resistance DC motor, and a transmission gear fixedly connected to the outer side of the rotating shaft;

[0013] Wherein, the rotating shaft is arranged inside the two groups of bearings.

[0014] As a preferred solution of the device for measuring the power of a Stirling engine model of the present invention, the adjusting force arm includes an arm rod adapted to be installed with the low-resistance DC motor, a sliding cavity opened inside the arm rod, and a guide rail opened on the inner wall of the sliding cavity.

[0015] As a preferred solution of the device for measuring the power of the Stirling engine model of the present invention, the regulating pressure rod comprises a slider slidably connected to the inside of the sliding cavity, a knob rotatably connected to the top of the slider, and rubber blocks fixedly connected to both sides of the slider, and a rod body is adapted to be installed inside the knob;

[0016] Wherein, the rubber block is located inside the guide rail, and the rubber block slides along the guide rail.

[0017] As a preferred solution of the device for measuring the power of a Stirling engine model of the present invention, wherein: the rod body comprises a threaded rod, a cone head fixedly connected to the bottom end of the threaded rod, and a groove provided on the outer side of the threaded rod;

[0018] Wherein, the threaded rod is threadedly connected to the knob, and the threaded rod is slidably connected to the inside of the slider via a groove.

[0019] Meanwhile, in view of the problem that the Stirling engine model in the prior art has a small volume and a low heat dissipation efficiency, the present invention is proposed.

[0020] Therefore, an object of the present invention is also to provide a control system.

[0021] In order to solve the above technical problems, the present invention also provides the following technical solutions: a control system, wherein the device for measuring the power of a Stirling engine model further comprises two sets of DC power supplies, a heating end temperature control unit, a cooling end temperature control unit and an electric power torque meter circuit unit;

[0022] Among them, the two groups of DC power supplies respectively power the heating end temperature control unit and the cooling end temperature control unit, the heating end temperature control unit is installed at the heating end of the Stirling engine model, the cooling end temperature control unit is installed at the cooling end of the Stirling engine model, and the electric torque meter circuit unit adjusts the low resistance DC motor.

[0023] As a preferred solution of the control system of the present invention, the heating end temperature control unit includes an annular electric heater, a K-type high-temperature thermocouple temperature probe, a first temperature control module and a coulomb meter, the annular electric heater is adapted to be installed at the heating end of the Stirling engine model, the K-type high-temperature thermocouple temperature probe is installed between the annular electric heater and the heating end, and the first temperature control module switches the annular electric heater on and off through the K-type high-temperature thermocouple temperature probe to adjust the temperature of the heating end.

[0024] As a preferred solution of the control system of the present invention, the cooling end temperature control unit includes a copper tube, a K-type thermocouple temperature probe, a second temperature control module, a circulating water pump, a water cooling head, a semiconductor refrigeration plate, a radiator and a forward and reverse switching switch. The copper tube and the K-type thermocouple temperature probe are bonded to the outside of the cooling end of the Stirling engine model. The forward and reverse switching switch adjusts the current direction of the semiconductor refrigeration plate and adjusts the cooling or heating of the water circulation.

[0025] As a preferred solution of the control system of the present invention, the electric torque meter circuit unit includes a voltage-stabilized power supply, a control switch and a potentiometer.

[0026] Beneficial effects of the present invention:

[0027] 1. By combining the Stirling engine model with the measuring device, the power efficiency can be measured conveniently and accurately.

[0028] 2. Through the coordination of the Stirling engine model and the control system, not only can the temperature of the cold and hot sources be controlled conveniently and accurately, but also the problem of overheating of the Stirling engine model during long-term operation can be solved, and the life of the Stirling engine model can be increased. At the same time, due to the stability of the temperature of the Stirling engine model, the accuracy of the power measurement of the Stirling engine model can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing 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 creative work. Among them:

[0030] Figure 1 It is an overall front schematic diagram of the present invention.

[0031] Figure 2 It is the overall rear view of the present invention.

[0032] Figure 3 It is an overall top view of the present invention.

[0033] Figure 4 It is a partial cross-sectional schematic diagram of the present invention.

[0034] Figure 5 It is a system schematic diagram of the present invention.

[0035] Figure 6 It is a schematic diagram of the circuit unit of the electric torque meter of the present invention. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0039] Example 1

[0040] Reference Figure 1 to Figure 3 , which is the first embodiment of the present invention, and provides a device for measuring the power of a Stirling engine model, comprising a supporting mechanism 100, a conversion mechanism 200, an adjustment mechanism 300 and an electronic scale 400;

[0041] The support mechanism 100 includes a base plate 101 and a support frame 102 fixedly connected to the top of the base plate 101, the conversion mechanism 200 is adapted to be installed inside the support frame 102, the adjustment mechanism 300 is adapted to be installed outside the conversion mechanism 200, and the electronic scale 400 is adapted to be installed on the top of the base plate 101;

[0042] The adjustment mechanism 300 includes an adjustment arm 301 and an adjustment pressure rod 302 . The adjustment pressure rod 302 is slidably connected inside the adjustment arm 301 .

[0043] Specifically, the support frame 102 includes a support plate 102a fixedly connected to the top of the bottom plate 101, side plates 102b fixedly connected to both sides of the support plate 102a, and bearings 102c adapted to be installed on the inner sides of the two sets of side plates 102b.

[0044] Further, the conversion mechanism 200 includes a low-resistance DC motor 201 adapted to be mounted on the outside of a set of side plates 102b, a rotating shaft 202 fixedly connected to the output end of the low-resistance DC motor 201, and a transmission gear 203 fixedly connected to the outside of the rotating shaft 202;

[0045] The rotating shaft 202 is disposed inside the two sets of bearings 102c.

[0046] The electric torque meter is meshed with the transmission gear 203 through the output gear D of the Stirling engine model A to receive the power output by the Stirling engine model A. At the same time, the meshing of the two sets of gears makes the power transmission efficiency high. The transmission gear 203 is installed on the rotating shaft 202 at the output end of the low-resistance DC motor 201. Since the two ends of the rotating shaft 202 are connected by the design of bearings 102c, the overall rotation resistance is very low, the power loss is small, and the total energy loss of the electric torque meter is low, which can ensure the relative accuracy of torque measurement.

[0047] In summary, the electric torque meter receives power by meshing with the output gear D of the Stirling engine model A. This design makes the power transmission efficiency high. The transmission gear 203 is installed on the rotating shaft 202 at the output end of the low-resistance DC motor 201, and the two ends of the rotating shaft 202 are connected by bearings 102c, which reduces the overall rotation resistance and power loss, thereby ensuring the relative accuracy of torque measurement.

[0048] Example 2

[0049] Reference Figure 1 to Figure 4 , which is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides an adjustment arm 301 including an arm rod 301a adapted to be installed with the low resistance DC motor 201, a sliding cavity 301b opened inside the arm rod 301a, and a guide rail 301c opened on the inner wall of the sliding cavity 301b.

[0050] It should be noted that the adjustment pressure rod 302 includes a slider 302a slidably connected to the inside of the sliding cavity 301b, a knob 302b rotatably connected to the top of the slider 302a, and rubber blocks 302c fixedly connected to both sides of the slider 302a. The inside of the knob 302b is adapted to be installed with a rod body 302d.

[0051] The rubber block 302c is located inside the guide rail 301c, and the rubber block 302c slides along the guide rail 301c.

[0052] Preferably, the rod body 302d includes a threaded rod 302d-1, a cone head 302d-2 fixedly connected to the bottom end of the threaded rod 302d-1, and a groove 302d-3 opened on the outer side of the threaded rod 302d-1;

[0053] The threaded rod 302d-1 is threadedly connected to the knob 302b, and the threaded rod 302d-1 is slidably connected to the inside of the slider 302a through the groove 302d-3.

[0054] By turning the knob 302b, the height of the threaded rod 302d-1 can be adjusted through the limit of the threaded rod 302d-1 and the slider 302a. By pulling the slider 302a, the adjustment pressure rod 302 can be driven to slide on the adjustment force arm 301 as a whole, and the stability after adjustment is ensured by the internal friction between the rubber block 302c and the guide rail 301c.

[0055] During calibration, first adjust and measure the effective force arm length, disconnect the meshing between the output gear D of the Stirling engine model A and the transmission gear 203, return the reading of the electronic scale 400 to zero, press the cone head 302d-2 of the adjusting pressure rod 302 onto the electronic scale 400, adjust the height of the adjusting pressure rod 302 itself and the position of the adjusting pressure rod 302 on the adjusting force arm 301 so that the arm 301a remains horizontal, press the cone head 302d-2 of the adjusting pressure rod 302 onto the electronic scale 400 several times, record the reading of the electronic scale 400, and take the average value. During measurement, the cone head 302d-2 of the adjusting pressure rod 302 is pressed onto the electronic scale 400, and the output gear D of the Stirling engine model A is meshed with the transmission gear 203 again, and the temperatures of the heating end B and the cooling end C of the Stirling engine model A are controlled to reach the set values. Then, the Stirling engine model A is started, and after its speed stabilizes, the indication of the electronic scale 400 is adjusted by the potentiometer 803 and the control switch 802. The indication of the electronic scale 400 minus the average value is the true indication. The output power of the Stirling engine model A can be obtained by the true indication, the effective force arm length, the speed of the Stirling engine model A, and the tooth number ratio of the output gear D of the Stirling engine model A to the transmission gear 203.

[0056] In summary, during the calibration process, first adjust and measure the effective force arm length, then disconnect the meshing between the output gear D of the Stirling engine model A and the transmission gear 203, and reset the electronic scale 400. Next, by adjusting the height and position of the pressure rod 302, ensure that the arm 301a is horizontal, and record and take the average value of the reading of the electronic scale 400. During measurement, re-engage the gears, control the temperature of the Stirling engine model A, start the engine and wait for the speed to stabilize, adjust the reading of the electronic scale 400 through the potentiometer 803 and the control switch 802, and finally subtract the average value from the reading of the electronic scale 400 to obtain the real reading, and then calculate the output power of the Stirling engine model A.

[0057] Example 3

[0058] Reference Figure 5 , Figure 6 , which is the third embodiment of the present invention. Different from the previous embodiment, this embodiment provides a control system, a device for measuring the power of a Stirling engine model, and also includes two sets of DC power supplies 500, a heating end temperature control unit 600, a cooling end temperature control unit 700 and an electric torque meter circuit unit 800;

[0059] Among them, two sets of DC power supplies 500 respectively provide energy for the heating end temperature control unit 600 and the cooling end temperature control unit 700. The heating end temperature control unit 600 is installed at the heating end B of the Stirling engine model A, and the cooling end temperature control unit 700 is installed at the cooling end C of the Stirling engine model A. The electric torque meter circuit unit 800 adjusts the low resistance DC motor 201.

[0060] Specifically, the heating end temperature control unit 600 includes an annular electric heater 601, a K-type high-temperature thermocouple temperature probe 602, a first temperature control module 603 and a coulomb meter 604. The annular electric heater 601 is adapted to be installed at the heating end B of the Stirling engine model A, and the K-type high-temperature thermocouple temperature probe 602 is installed between the annular electric heater 601 and the heating end B. The first temperature control module 603 switches the annular electric heater 601 on and off through the K-type high-temperature thermocouple temperature probe 602 to adjust the temperature of the heating end B.

[0061] Furthermore, the cooling end temperature control unit 700 includes a copper tube 701, a K-type thermocouple temperature probe 702, a second temperature control module 703, a circulating water pump 704, a water cooling head 705, a semiconductor cooling plate 706, a radiator 707 and a forward and reverse switching switch 708. The copper tube 701 and the K-type thermocouple temperature probe 702 are bonded to the outside of the cooling end C of the Stirling engine model A. The forward and reverse switching switch 708 adjusts the current direction of the semiconductor cooling plate 706 and adjusts the cooling or heating of the water circulation.

[0062] The annular electric heater 601 is wrapped with heat-resistant and heat-insulating materials on the outside, which reduces heat loss and improves safety in use.

[0063] The current direction of the semiconductor refrigeration plate 706 can be controlled by the forward and reverse switching switch 708 to achieve cooling or heating of the water circulation. The water circulation system can keep the cooling end C of the Stirling engine model A at a stable temperature and avoid the problem of excessive temperature of the Stirling engine model A casing, thereby increasing the safety of use and the continuous operation time of the Stirling engine model, and extending the life of the Stirling engine model.

[0064] The thermal efficiency of the Stirling engine model can be obtained by the average heating power of the annular electric heater 601 obtained by the coulomb meter 604.

[0065] Example 4

[0066] Reference Figure 6 , which is the fourth embodiment of the present invention. Different from the previous embodiment, this embodiment provides an electric torque meter circuit unit 800, including a stabilized power supply 801, a control switch 802 and a potentiometer 803.

[0067] The electric torque meter circuit unit 800 can adjust the torque applied to the low-resistance DC motor 201 in sections. When the control switch 802 is disconnected, the external circuit resistance of the low-resistance DC motor 201 can be controlled by controlling the potentiometer 803. When the Stirling engine model A is working, the rotor of the low-resistance DC motor 201 is driven to rotate by gear meshing, so that the low-resistance DC motor 201 is converted into a DC generator. In order to control the resistance of the external circuit, the current passing through the low-resistance DC motor 201 can be controlled, thereby adjusting the torque applied to the rotor of the low-resistance DC motor 201. When the control switch 802 is closed, the low-resistance DC motor 201 is connected to the potentiometer 803 in a voltage divider connection. The voltage of the low-resistance DC motor 201 can be adjusted by controlling the potentiometer 803, thereby increasing the torque that resists the rotor of the low-resistance DC motor 201 from rotating in the opposite direction.

Claims

1. A device for measuring the power of a Stirling engine model, characterized in that: It comprises a supporting mechanism (100), a conversion mechanism (200), an adjustment mechanism (300) and an electronic scale (400); The support mechanism (100) comprises a base plate (101) and a support frame (102) fixedly connected to the top of the base plate (101); the conversion mechanism (200) is adapted to be installed on the inner side of the support frame (102); the adjustment mechanism (300) is adapted to be installed on the outer side of the conversion mechanism (200); and the electronic scale (400) is adapted to be installed on the top of the base plate (101); The adjustment mechanism (300) comprises an adjustment force arm (301) and an adjustment pressure rod (302), wherein the adjustment pressure rod (302) is slidably connected inside the adjustment force arm (301).

2. The device for measuring the power of a Stirling engine model as claimed in claim 1, characterized in that: The support frame (102) comprises a support plate (102a) fixedly connected to the top of the bottom plate (101), side plates (102b) fixedly connected to both sides of the support plate (102a), and bearings (102c) adapted to be mounted on the inner sides of the two sets of side plates (102b).

3. The device for measuring the power of a Stirling engine model as claimed in claim 2, characterized in that: The conversion mechanism (200) comprises a low-resistance DC motor (201) adapted to be mounted on the outside of a group of side plates (102b), a rotating shaft (202) fixedly connected to the output end of the low-resistance DC motor (201), and a transmission gear (203) fixedly connected to the outside of the rotating shaft (202); Wherein, the rotating shaft (202) is arranged inside the two sets of bearings (102c).

4. The device for measuring the power of a Stirling engine model as claimed in claim 3, characterized in that: The regulating force arm (301) comprises an arm (301a) adapted to be mounted on the low-resistance DC motor (201), a sliding cavity (301b) provided inside the arm (301a), and a guide rail (301c) provided on the inner wall of the sliding cavity (301b).

5. The device for measuring the power of a Stirling engine model as claimed in claim 4, characterized in that: The regulating pressure rod (302) comprises a slider (302a) slidably connected to the inside of the sliding cavity (301b), a knob (302b) rotatably connected to the top of the slider (302a), and rubber blocks (302c) fixedly connected to both sides of the slider (302a); a rod body (302d) is adapted to be installed inside the knob (302b); The rubber block (302c) is located inside the guide rail (301c), and the rubber block (302c) slides along the guide rail (301c).

6. The device for measuring the power of a Stirling engine model as claimed in claim 5, characterized in that: The rod body (302d) comprises a threaded rod (302d-1), a cone head (302d-2) fixedly connected to the bottom end of the threaded rod (302d-1), and a groove (302d-3) provided on the outside of the threaded rod (302d-1); The threaded rod (302d-1) is threadedly connected to the knob (302b), and the threaded rod (302d-1) is slidably connected to the inside of the slider (302a) via a groove (302d-3).

7. A control system, characterized in that: The device for measuring the power of a Stirling engine model according to claim 6 further comprises two sets of DC power supplies (500), a heating end temperature control unit (600), a cooling end temperature control unit (700) and an electric torque meter circuit unit (800); The two groups of DC power supplies (500) respectively supply energy to the heating end temperature control unit (600) and the cooling end temperature control unit (700); the heating end temperature control unit (600) is installed at the heating end (B) of the Stirling engine model (A); the cooling end temperature control unit (700) is installed at the cooling end (C) of the Stirling engine model (A); and the electric torque meter circuit unit (800) adjusts the low resistance DC motor (201).

8. The control system according to claim 7, characterized in that: The heating end temperature control unit (600) comprises an annular electric heater (601), a K-type high temperature thermocouple temperature probe (602), a first temperature control module (603) and a coulometer (604); the annular electric heater (601) is adapted to be installed at the heating end (B) of the Stirling engine model (A); the K-type high temperature thermocouple temperature probe (602) is installed between the annular electric heater (601) and the heating end (B); and the first temperature control module (603) switches the annular electric heater (601) on and off through the K-type high temperature thermocouple temperature probe (602) to adjust the temperature of the heating end (B).

9. The control system according to claim 8, characterized in that: The cooling end temperature control unit (700) comprises a copper tube (701), a K-type thermocouple temperature probe (702), a second temperature control module (703), a circulating water pump (704), a water cooling head (705), a semiconductor cooling plate (706), a radiator (707) and a forward / reverse switching switch (708). The copper tube (701) and the K-type thermocouple temperature probe (702) are bonded to the outside of the cooling end (C) of the Stirling engine model (A). The forward / reverse switching switch (708) adjusts the current direction of the semiconductor cooling plate (706) and adjusts the cooling or heating of the water circulation.

10. The control system according to claim 9, characterized in that: The electric torque meter circuit unit (800) comprises a voltage-stabilized power supply (801), a control switch (802) and a potentiometer (803).

Images