Device for measuring power of Stirling engine model and control system

Abstract

The utility model 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, comprising a support 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 utility model relates to stirling engine model measurement technical field especially a device and control system of measuring stirling engine model power. BACKGROUND

[0002] A stirling engine model is a heat engine that converts thermal energy into mechanical work by expanding and compressing a working gas driven by an external heat source. It typically 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 a stirling engine is based on the stirling cycle, which involves the processes of heating, expanding, cooling, and compressing the gas to achieve the mutual conversion between thermal energy and mechanical energy.

[0003] The main advantage of a stirling engine is its high efficiency in converting thermal energy, especially when the external heat source is stable, its thermal efficiency can approach the Carnot efficiency. This makes the stirling engine have broad application prospects in some applications that require efficient thermal energy utilization, such as micro-power generation, portable energy systems, and aerospace, etc. In addition, the design of the stirling engine is relatively compact, low noise, suitable for scenes that require quiet and stable power output.

[0004] However, the power of a stirling engine model is usually low, generally between a few milliwatts and a few hundred milliwatts, and this low power level brings significant challenges to power measurement. Because the power change range is small, existing measurement techniques often have difficulty capturing such small fluctuations, especially in real-time monitoring and accurate measurement processes, there may be some errors. Therefore, it is particularly important to develop high-precision, high-sensitivity power measurement equipment to accurately reflect the output power of the stirling engine under different working conditions.

[0005] At the same time, the stirling engine model is widely welcomed in various applications due to its compact design, especially in environments with limited space. However, this small volume 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 a long time of work, the temperature of the engine housing may rise significantly, causing overheating problems. High temperature not only affects the performance of the engine, reduces its power output and thermal efficiency, but also may cause thermal damage to the materials. 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 compact design is the key to improving the reliability of the stirling engine and prolonging its service life. SUMMARY

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

[0007] Therefore, the utility model discloses a kind of device for measuring Stirling engine model power.

[0008] To solve the above technical problems, the utility model provides the following technical scheme: a kind of device for measuring Stirling engine model power, including support mechanism, conversion mechanism, adjusting mechanism and electronic scale;

[0009] The support mechanism includes a bottom plate and a support frame fixedly connected to the top end of the bottom plate, the conversion mechanism is adapted to be installed inside the support frame, the adjusting mechanism is adapted to be installed outside the conversion mechanism, and the electronic scale is adapted to be installed at the top end of the bottom plate.

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

[0011] As a preferred scheme of the device for measuring Stirling engine model power of the utility model, wherein: the support frame includes a support plate fixedly connected to the top end of the bottom plate, side plates fixedly connected to both sides of the support plate, and bearings adapted to be installed inside the two groups of side plates.

[0012] As a preferred scheme of the device for measuring Stirling engine model power of the utility model, wherein: the conversion mechanism includes a low-resistance DC motor adapted to be installed outside one group of side plates, a rotating shaft fixedly connected to the output end of the low-resistance DC motor, and a transmission gear fixedly connected outside the rotating shaft.

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

[0014] As a preferred scheme of the device for measuring Stirling engine model power of the utility model, wherein: the adjusting force arm includes an arm lever adapted to be installed with the low-resistance DC motor, a sliding cavity opened inside the arm lever, and a guide rail opened in the inner wall of the sliding cavity.

[0015] As a preferred scheme of the device for measuring Stirling engine model power of the utility model, wherein: the adjusting pressure rod includes a sliding block slidingly connected inside the sliding cavity, a knob rotatably connected to the top end of the sliding block, and rubber blocks fixedly connected to both sides of the sliding block, and a rod body is adapted to be installed inside the knob.

[0016] The rubber blocks are located inside the guide rails, and the rubber blocks slide along the guide rails.

[0017] As a preferred scheme of the device for measuring power of the Stirling engine model, the rod body comprises a threaded rod, a taper head fixedly connected to the bottom end of the threaded rod, and a groove opened on the outer side of the threaded rod.

[0018] The threaded rod is in threaded connection with the knob, and the threaded rod is in sliding connection with the slider through the groove.

[0019] Meanwhile, in view of the problem of low heat dissipation efficiency of the Stirling engine model due to small volume in the prior art, the utility model is provided.

[0020] Therefore, the utility model also provides a control system.

[0021] To solve the above technical problems, the utility model further provides the following technical scheme: a control system, the device for measuring power of the Stirling engine model further comprises two groups of direct current power supplies, a heating end temperature control unit, a cooling end temperature control unit and an electric power torque meter circuit unit.

[0022] The two groups of direct current power supplies supply energy for the heating end temperature control unit and the cooling end temperature control unit respectively, 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 power torque meter circuit unit adjusts the low-resistance direct current motor.

[0023] As a preferred scheme of the control system, the heating end temperature control unit comprises 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 adaptively 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 adjusts the temperature of the heating end by turning on and off the annular electric heater through the K-type high-temperature thermocouple temperature probe.

[0024] As a preferred scheme of the control system, the cooling end temperature control unit comprises a copper pipe, a K-type thermocouple temperature probe, a second temperature control module, a circulating water pump, a water cooling head, a semiconductor refrigeration sheet, a radiator and a forward-reverse switching switch, the copper pipe and the K-type thermocouple temperature probe are bonded to the outer side of the cooling end of the Stirling engine model, and the forward-reverse switching switch adjusts the current direction of the semiconductor refrigeration sheet and adjusts the cooling or heating of water circulation.

[0025] As a preferred scheme of the control system, the electric power torque meter circuit unit comprises a stabilized power supply, a control switch and a potentiometer.

[0026] The utility model has the advantages that:

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

[0028] 2. By coordinating the Stirling engine model with the control system, not only can the temperature of the cold and heat sources be controlled conveniently and accurately, but the problem of overheating during long-term operation of the Stirling engine model can also be solved, increasing its lifespan. Furthermore, the stable temperature of the Stirling engine model can further improve the accuracy of power measurement. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0030] Figure 1 This is a frontal view of the entire utility model.

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

[0032] Figure 3 This is a top view of the entire utility model.

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

[0034] Figure 5 This is a schematic diagram of the system of this utility model.

[0035] Figure 6 This is a schematic diagram of the circuit unit of the electro-torque meter of this utility model. Detailed Implementation

[0036] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0037] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the "one embodiment" or "embodiment" referred to herein is intended to mean a specific feature, structure, characteristic, or combination of features and characteristics described herein that is included in at least one implementation of the present application. The various appearances of "in one embodiment" or "in an embodiment" in the specification are not necessarily all referring to the same embodiment.

[0039] Embodiment 1

[0040] With reference to Figures 1-3 For the first embodiment of the present application, the embodiment provides a device for measuring power of a Stirling engine model, comprising a supporting mechanism 100, a conversion mechanism 200, an adjusting mechanism 300 and an electronic scale 400.

[0041] The supporting mechanism 100 comprises a bottom plate 101 and a supporting frame 102 fixedly connected to the top end of the bottom plate 101, the conversion mechanism 200 is adaptively installed inside the supporting frame 102, the adjusting mechanism 300 is adaptively installed outside the conversion mechanism 200, and the electronic scale 400 is adaptively installed at the top end of the bottom plate 101.

[0042] The adjusting mechanism 300 comprises an adjusting force arm 301 and an adjusting pressure rod 302, and the adjusting pressure rod 302 is slidingly connected inside the adjusting force arm 301.

[0043] Specifically, the supporting frame 102 comprises a supporting plate 102a fixedly connected to the top end of the bottom plate 101, side plates 102b fixedly connected to both sides of the supporting plate 102a, and bearings 102c adaptively installed inside the two groups of side plates 102b.

[0044] Further, the conversion mechanism 200 comprises a low-resistance DC motor 201 adaptively installed outside one 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.

[0045] Among them, the rotating shaft 202 is arranged inside the two groups of bearings 102c.

[0046] The electric power torque meter is engaged with the transmission gear 203 through the output gear D of the Stirling engine model A, so as to receive the power output by the Stirling engine model A. At the same time, the engagement of the two gears makes the transmission efficiency of the power 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 through the design of the bearings 102c, the overall rotation resistance is very low, the power loss is small, the total energy loss of the electric power torque meter is low, and the relative accuracy of the torque measurement can be guaranteed.

[0047] In summary, the electric power torque meter receives power by engaging with the output gear D of the Stirling engine model A, and 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 rotating shaft 202 is connected at both ends through the bearing 102c, which reduces the overall rotational resistance and power loss, thereby ensuring the relative accuracy of the torque measurement.

[0048] Embodiment 2

[0049] With reference to Figures 1-4 For the second embodiment of the utility model, unlike the previous embodiment, this embodiment provides an adjusting force arm 301 which includes an arm rod 301a adapted and installed with the low-resistance DC motor 201, a sliding cavity 301b opened in the arm rod 301a, and a guide rail 301c opened in the inner wall of the sliding cavity 301b.

[0050] It should be noted that the adjusting pressure rod 302 includes a sliding block 302a slidingly connected in the sliding cavity 301b, a knob 302b rotatably connected at the top end of the sliding block 302a, and rubber blocks 302c fixedly connected on both sides of the sliding block 302a, and the inside of the knob 302b is adapted and installed with a rod body 302d.

[0051] Among them, the rubber block 302c is located in the inside of 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 tapered head 302d-2 fixedly connected at the bottom end of the threaded rod 302d-1, and a groove 302d-3 opened on the outside of the threaded rod 302d-1.

[0053] Among them, the threaded rod 302d-1 is threadedly connected with the knob 302b, and the threaded rod 302d-1 is slidingly connected with the inside of the sliding block 302a through the groove 302d-3.

[0054] By rotating the knob 302b, the height of the threaded rod 302d-1 can be adjusted by limiting the threaded rod 302d-1 and the sliding block 302a. By pulling the sliding block 302a, the adjusting pressure rod 302 can be slid on the adjusting force arm 301 as a whole, and the stability after adjustment can be ensured by the internal friction between the rubber block 302c and the guide rail 301c.

[0055] During calibration, the effective force arm length is adjusted and measured, the engagement between the output gear D of the Stirling engine model A and the transmission gear 203 is disconnected, the electronic scale 400 is set to zero, the taper head 302d-2 of the adjusting pressure rod 302 is pressed on the electronic scale 400, the height of the adjusting pressure rod 302 and the position of the adjusting pressure rod 302 in the adjusting force arm 301 are adjusted so that the arm rod 301a is kept horizontal, the taper head 302d-2 of the adjusting pressure rod 302 is pressed on the electronic scale 400 for several times, and the average value of the readings of the electronic scale 400 is recorded. During measurement, the taper head 302d-2 of the adjusting pressure rod 302 is pressed on the electronic scale 400, the engagement between the output gear D of the Stirling engine model A and the transmission gear 203 is re-engaged, the temperature of the heating end B and the cooling end C of the Stirling engine model A is controlled to reach the set value, then the Stirling engine model A is started, after the rotating speed of the Stirling engine model A is stabilized, the reading of the electronic scale 400 is adjusted through the potentiometer 803 and the control switch 802, the true reading of the electronic scale 400 is obtained by subtracting the average value from the reading of the electronic scale 400, and the output power of the Stirling engine model A is obtained through the true reading, the effective force arm length, the rotating speed of the Stirling engine model A and the gear ratio between the output gear D of the Stirling engine model A and the transmission gear 203.

[0056] In summary, during calibration, the effective force arm length is adjusted and measured, then the engagement between the output gear D of the Stirling engine model A and the transmission gear 203 is disconnected, and the electronic scale 400 is set to zero. Then, the height and position of the adjusting pressure rod 302 are adjusted to ensure that the arm rod 301a is horizontal, and the average value of the readings of the electronic scale 400 is recorded. During measurement, the engagement between the gears is re-engaged, the temperature of the Stirling engine model A is controlled, the engine is started and waits for the rotating speed to stabilize, then the reading of the electronic scale 400 is adjusted through the potentiometer 803 and the control switch 802, the true reading is obtained by subtracting the average value from the reading of the electronic scale 400, and the output power of the Stirling engine model A is calculated.

[0057] Embodiment 3

[0058] Reference Figure 5 , Figure 6 The third embodiment of the utility model differs from the previous embodiment in that the embodiment provides a control system for measuring the power of a Stirling engine model, and further comprises two groups of direct current power supplies 500, a heating end temperature control unit 600, a cooling end temperature control unit 700 and an electric power torque meter circuit unit 800.

[0059] Two groups of direct current power supply 500 respectively supply power for heating end temperature control unit 600 and 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 power torque meter circuit unit 800 adjusts the low-resistance direct current motor 201.

[0060] Specifically, the heating end temperature control unit 600 comprises a ring-shaped electric heater 601, a K-type high-temperature thermocouple temperature probe 602, a first temperature control module 603 and a coulomb meter 604, the ring-shaped electric heater 601 is adaptively 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 ring-shaped electric heater 601 and the heating end B, and the first temperature control module 603 is connected to the ring-shaped electric heater 601 through the K-type high-temperature thermocouple temperature probe 602 to adjust the temperature of the heating end B.

[0061] Further, the cooling end temperature control unit 700 comprises a copper pipe 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 refrigeration piece 706, a radiator 707 and a positive-negative switching switch 708, the copper pipe 701 and the K-type thermocouple temperature probe 702 are bonded outside the cooling end C of the Stirling engine model A, and the positive-negative switching switch 708 adjusts the current direction of the semiconductor refrigeration piece 706 and adjusts the cooling or heating of the water circulation.

[0062] The ring-shaped electric heater 601 is wrapped with heat-resistant insulation material, which reduces heat loss and improves safety in use.

[0063] The current direction of the semiconductor refrigeration piece 706 can be controlled through the positive-negative switching switch 708, the water circulation system can keep the cooling end C of the Stirling engine model A at a stable temperature, the problem of excessively high temperature of the Stirling engine model A can be avoided, the safety in use and the continuous running time of the Stirling engine model are increased, and the service life of the Stirling engine model is prolonged.

[0064] The average heating power of the ring-shaped electric heater 601 obtained by the coulomb meter 604 can be used to obtain the thermal efficiency of the Stirling engine model.

[0065] Embodiment 4

[0066] Reference Figure 6 The fourth embodiment of the utility model is different from the previous embodiment, and the electric power torque meter circuit unit 800 is provided, which comprises a stabilized power supply 801, a control switch 802 and a potentiometer 803.

[0067] The electric power torque meter circuit unit 800 can adjust the torque received by the low-resistance DC motor 201 in sections. When the control switch 802 is open, the size of 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 low-resistance DC motor 201 rotor is rotated by gear engagement, so that the low-resistance DC motor 201 becomes a DC generator. In order to control the size of the external circuit resistance, the size of the current passing through the low-resistance DC motor 201 can be controlled, so as to adjust the torque applied to the low-resistance DC motor 201 rotor. When the control switch 802 is closed, the low-resistance DC motor 201 is connected to the potentiometer 803 in a voltage division mode. The voltage of the low-resistance DC motor 201 can be adjusted by controlling the potentiometer 803, so as to increase the torque resisting the rotation of the low-resistance DC motor 201 rotor in the opposite direction.

Claims

1. An apparatus for measuring power of a Stirling engine model, characterized by: The support mechanism (100), the conversion mechanism (200), the adjustment mechanism (300) and the electronic scale (400) are included. The support mechanism (100) includes a bottom plate (101) and a support frame (102) fixedly connected to the top end of the bottom 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 at the top end of the bottom plate (101). The adjustment mechanism (300) includes an adjustment force arm (301) and an adjustment pressure rod (302), and the adjustment pressure rod (302) is slidingly connected inside the adjustment force arm (301).

2. The apparatus for measuring the power of a Stirling engine model as claimed in claim 1, wherein: The support frame (102) includes a support plate (102a) fixedly connected to the top end 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 inside the two groups of side plates (102b).

3. The apparatus for measuring the power of a Stirling engine model as claimed in claim 2, wherein: The conversion mechanism (200) includes a low-resistance DC motor (201) adapted to be installed outside 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). The rotating shaft (202) is arranged inside the two groups of bearings (102c).

4. The apparatus for measuring the power of a Stirling engine model of claim 3, wherein: The adjustment force arm (301) includes 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 in the inner wall of the sliding cavity (301b).

5. The apparatus for measuring the power of a Stirling engine model of claim 4, wherein: The adjustment pressure rod (302) includes a sliding block (302a) slidingly connected inside the sliding cavity (301b), a knob (302b) rotatably connected to the top end of the sliding block (302a), and rubber blocks (302c) fixedly connected to both sides of the sliding block (302a), and a rod body (302d) adapted to be installed inside the knob (302b). The rubber blocks (302c) are located inside the guide rail (301c), and the rubber blocks (302c) slide along the guide rail (301c).

6. The apparatus for measuring power of a Stirling engine model as claimed in claim 5, wherein: The rod body (302d) includes a threaded rod (302d-1), a tapered head (302d-2) fixedly connected to the bottom end of the threaded rod (302d-1), and a groove (302d-3) opened outside the threaded rod (302d-1). The threaded rod (302d-1) is threadedly connected with the knob (302b), and the threaded rod (302d-1) is slidingly connected with the inside of the sliding block (302a) through the groove (302d-3).

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

8. The control system of claim 7, wherein: 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 coulomb meter (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) is used to turn on and off the annular electric heater (601) through the K-type high-temperature thermocouple temperature probe (602) to adjust the temperature of the heating end (B).

9. The control system of claim 8, wherein: The cooling end temperature control unit (700) comprises a copper pipe (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 refrigeration sheet (706), a heat sink (707) and a forward-reverse switching switch (708), the copper pipe (701) and the K-type thermocouple temperature probe (702) are bonded outside the cooling end (C) of the Stirling engine model (A), and the forward-reverse switching switch (708) is used to adjust the current direction of the semiconductor refrigeration sheet (706) and adjust the cooling or heating of water circulation.

10. The control system of claim 9, wherein: The electric power torque meter circuit unit (800) comprises a stabilized power supply (801), a control switch (802) and a potentiometer (803).

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