A heating and cooling cycle device for a large coil

Abstract

This utility model discloses a heating and cooling circulation device for large coils, belonging to the field of large coil testing technology, and solves the technical problem of slow cooling speed in existing heating and cooling circulation testing equipment. The device includes a test platform for mounting the coil, a controller, a heating power supply, and a temperature sensor for detecting the coil's temperature. The test platform is covered with ventilation holes running through its top and bottom sides. A connector for electrically connecting the coil and the heating power supply is electrically connected to the connector on the top of the test platform. A housing cover covers the top of the test platform, and a support frame is provided around the perimeter of the test platform. A drive mechanism for opening and closing the housing cover is located in the middle of the top of the support frame. An air supply mechanism and a cooling mechanism are located at the bottom of the test platform, and an exhaust mechanism is located at the top of the housing cover. The controller controls the air supply mechanism, cooling mechanism, and exhaust mechanism to work together, accurately controlling the coil's cooling rate.

Description

Technical Field

[0001] This utility model relates to the field of large coil testing technology, and more specifically, it relates to a heating and cooling circulation device for a large coil. Background Technology

[0002] The coils (coils) used in large generators need to undergo thermal cycling tests, that is, heating and cooling cycle tests. Only those that pass the tests can be used to ensure the working life and stability of large generators.

[0003] Patent publication document CN112269081A discloses a multi-factor aging stress control platform for stator bars of large hydro generators, including a vibrator cement base, an intelligent signal generator, a power amplifier, an electric vibrator, a piezoelectric force sensor, a charge amplifier, a heating plate, a stator bar multi-factor aging stress control platform body, a whole stator bar, a high-voltage cable, a thermocouple, a temperature control box, a vibrator cooling system, a parallel welding block, a stator bar fixing bracket, a supporting insulator, a transformer, and a vibrator ventilation slot.

[0004] Because the test requires a certain heating and cooling rate for the coil (e.g., heating and cooling rate: (2.5±1)℃ / min), the above scheme, through the exciter ventilation slot, can no longer achieve cooling at the heating and cooling rate when the coil temperature is close to the ambient temperature, that is, the cooling rate is slower. Utility Model Content

[0005] The technical problem to be solved by this utility model is to address the above-mentioned shortcomings of the prior art. The purpose of this utility model is to provide a heating and cooling circulation device for large coils.

[0006] The technical solution of this utility model is: a heating and cooling circulation device for a large coil, including a test platform for mounting the coil, a controller, a heating power supply, and a temperature sensor for detecting the temperature of the coil. The test platform is covered with ventilation holes running through its upper and lower sides. The top of the test platform is provided with a connector for electrically connecting the coil. The heating power supply is electrically connected to the connector. The top of the test platform is covered with a box cover. A support frame is provided around the test platform. A drive mechanism for opening / closing the box cover is provided in the middle of the top of the support frame. The bottom of the test platform is provided with an air supply mechanism and a cooling mechanism. The top of the box cover is provided with an exhaust mechanism. The controller is electrically connected to the heating power supply, temperature sensor, drive mechanism, air supply mechanism, cooling mechanism, and exhaust mechanism.

[0007] As a further improvement, the drive mechanism includes a lead screw connected to the housing cover, a lead screw nut seat threadedly connected to the lead screw is rotatably provided on the top of the support frame, a motor that drives the lead screw nut seat to rotate, and the controller is electrically connected to the motor.

[0008] Furthermore, the driving mechanism is an electric push rod, a pneumatic cylinder, an electric hydraulic cylinder, or an electric hoist.

[0009] Furthermore, the test platform is equipped with a guide rail that is slidably connected to the box cover.

[0010] Furthermore, the inner wall of the box cover is provided with a heat insulation layer.

[0011] Furthermore, the air supply mechanism includes multiple blowers evenly arranged at the bottom of the test platform, and the controller is electrically connected to the blowers.

[0012] Furthermore, the refrigeration mechanism includes cooling coils located below the air supply mechanism and evenly distributed, a refrigeration unit is provided on the outside of the test platform, the refrigeration unit sends cold air into the cooling coils through an axial flow fan, and the controller is electrically connected to the refrigeration unit and the axial flow fan.

[0013] Furthermore, the ventilation mechanism includes a plurality of exhaust fans evenly arranged on the top of the housing cover, and the controller is electrically connected to the exhaust fans.

[0014] Furthermore, the temperature sensor is a thermocouple in contact with the coil, or an infrared temperature sensor installed on the inner wall of the housing cover.

[0015] Furthermore, it also includes an over-temperature protector, an alarm electrically connected to the over-temperature protector, the probe of the over-temperature protector being in contact with the coil, the alarm being mounted on the housing cover or support frame, and the controller being electrically connected to the over-temperature protector.

[0016] Beneficial effects

[0017] Compared with the prior art, the advantages of this utility model are as follows:

[0018] This invention utilizes a supply air mechanism and an exhaust air mechanism to create convection airflow, ensuring uniform air pressure and velocity across the coil. When the coil temperature is high, the supply air mechanism and exhaust air mechanism alone are sufficient to guarantee the cooling rate. When the coil temperature approaches ambient temperature, a cooling mechanism is required to supplement the cooling rate. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the left-side structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the drive mechanism, which is an electric push rod, in this utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the box cover in this utility model;

[0023] Figure 5 This is a schematic diagram of the ventilation holes and cooling coils of the test platform in this utility model;

[0024] Figure 6 This is a schematic diagram of the coil installation in this utility model.

[0025] The components are as follows: 1-coil, 2-test platform, 3-heating power supply, 4-temperature sensor, 5-ventilation hole, 6-connector, 7-box cover, 8-support frame, 9-drive mechanism, 10-lead screw, 11-lead screw nut seat, 12-motor, 13-guide rail, 14-blower, 15-cooling coil, 16-refrigeration unit, 17-axial flow fan, 18-exhaust fan, 19-thermocouple, 20-alarm, 21-probe, 22-mounting hole, 23-connecting copper busbar, 24-connector, 25-connecting pipe, 26-foot, 27-bottom cover, 28-slider, 29-conductor, 30-insulation layer. Detailed Implementation

[0026] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0027] See Figures 1-6 A heating and cooling circulation device for a large coil includes a test platform 2 for mounting a coil 1 (i.e., a wire bar, the coil 1 being composed of a conductor 29 and an insulation layer 30). The test platform 2 has support legs 26 around its bottom. It also includes a controller, a heating power supply 3, and a temperature sensor 4 for detecting the temperature of the coil 1. The test platform 2 is covered with ventilation holes 5 penetrating its upper and lower sides. The top of the test platform 2 is provided with a connecting seat 6 for electrically connecting the coil 1. The heating power supply 3 is electrically connected to the connecting seat 6. The top of the test platform 2 is covered with a box cover 7. The test platform 2 is surrounded by a support frame 8. The top of the support frame 8 is provided with a drive mechanism 9 for opening / closing the box cover 7. The bottom of the test platform 2 is provided with an air supply mechanism and a cooling mechanism. The top of the box cover 7 is provided with an exhaust mechanism. The controller is electrically connected to the heating power supply 3, the temperature sensor 4, the drive mechanism 9, the air supply mechanism, the cooling mechanism, and the exhaust mechanism.

[0028] In one embodiment, the drive mechanism 9 includes a lead screw 10 connected to the housing cover 7, a lead screw nut seat 11 threadedly connected to the lead screw 10 and a motor 12 driving the lead screw nut seat 11 to rotate, and a controller electrically connected to the motor 12. Specifically, the motor 12 drives the lead screw nut seat 11 through a worm gear mechanism, that is, the motor 12 is connected to the worm, the worm gear is fixedly sleeved on the periphery of the lead screw nut seat 11, and the worm and the worm gear mesh.

[0029] In one embodiment, the drive mechanism 9 is an electric push rod, a pneumatic cylinder, an electric hydraulic cylinder, or an electric hoist, such as... Figure 3 As shown.

[0030] The test platform 2 is equipped with guide rails 13 that are slidably connected to the box cover 7. Specifically, guide rails 13 are provided at the four corners of the test platform 2. The upper end of the guide rails 13 is connected to the support frame 8. The box cover 7 is equipped with sliders 28 that are slidably connected to the guide rails 13, which can improve the stability of the box cover 7 moving up and down.

[0031] Box cover 7 Figure 4 As shown, the inner wall of the box cover 7 is equipped with an insulation layer, which can reduce heat loss during the heating process.

[0032] The air supply mechanism includes multiple blowers 14 evenly arranged at the bottom of the test platform 2, and a controller electrically connected to the blowers 14. Specifically, four blowers 14 are evenly arranged at the bottom of the test platform 2 to improve the uniformity of air supply.

[0033] The refrigeration mechanism includes cooling coils 15 evenly distributed below the air supply mechanism. A refrigeration unit 16 is installed on the outside of the test platform 2. The refrigeration unit 16 adopts existing refrigeration equipment. The refrigeration unit 16 delivers cold air into the cooling coils 15 through an axial flow fan 17. The controller is electrically connected to the refrigeration unit 16 and the axial flow fan 17. Specifically, the cold air output end of the refrigeration unit 16 is connected to the cooling coils 15 through a connecting pipe 25, and the axial flow fan 17 is installed on the connecting pipe 25.

[0034] The bottom of the test platform 2 is provided with a bottom cover 27, and the air supply mechanism and the cooling mechanism are both installed inside the bottom cover 27.

[0035] The ventilation mechanism includes multiple exhaust fans 18 evenly arranged on the top of the housing cover 7. The controller is electrically connected to the exhaust fans 18 to improve the uniformity of ventilation. Specifically, four exhaust fans 18 are evenly arranged on the top of the housing cover 7, and the top of the housing cover 7 is provided with mounting holes 22 for installing the exhaust fans 18.

[0036] The air supply and exhaust mechanisms create convection airflow, ensuring uniform air pressure and velocity across the coil. When the coil temperature is high, the cooling rate can be maintained simply by the combined operation of the air supply and exhaust mechanisms. When the coil temperature approaches ambient temperature, a cooling system is required to supplement the cooling rate.

[0037] In one embodiment, the temperature sensor 4 is a thermocouple 19 in contact with the coil 1, such as... Figure 6 As shown.

[0038] In one embodiment, the temperature sensor 4 can also be an infrared temperature sensor installed on the inner wall of the housing cover 7, such as... Figure 1 As shown.

[0039] To prevent overheating, this device also includes an overheat protector and an alarm 20 electrically connected to the overheat protector. The probe 21 of the overheat protector is in contact with the coil 1. The alarm 20 is mounted on the housing cover 7 or the support frame 8. The controller is electrically connected to the overheat protector. When the temperature of the coil 1 reaches the alarm value, the overheat protector controls the alarm 20 to sound an alarm. At this time, the output of the heating power supply 3 can be directly cut off by the overheat protector to stop heating, or the controller can activate compensating cooling after receiving the alarm signal from the overheat protector. That is, the air supply mechanism, the exhaust mechanism, and the cooling mechanism work simultaneously to quickly lower the temperature of the coil 1.

[0040] In this embodiment, the controller uses an existing temperature control device, which has a built-in PID adjustment function.

[0041] During the thermal cycling test, coil 1 is installed on test platform 2. Both ends of coil 1 are connected via connecting seats 6, and the two connecting seats 6 are connected by a plate-shaped connector 24. Heating power supply 3 is connected to both ends of coil 1 via connecting copper busbars 23. During heating, the temperature control device uses its built-in PID control to power the coil 1 via the heating power supply 3, achieving a constant rate of temperature increase through the self-heating of coil 1. During cooling, the temperature control device uses its built-in PID control to coordinate the air supply mechanism, exhaust mechanism, and refrigeration mechanism to achieve a constant rate of temperature decrease.

[0042] The above are merely preferred embodiments of this utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these will not affect the implementation effect of this utility model or the practicality of the patent.

Claims

1. A heating and cooling cycle device for a large coil, comprising a test platform (2) for mounting a coil (1), characterized in that, It also includes a controller, a heating power supply (3), and a temperature sensor (4) for detecting the temperature of the coil (1). The test platform (2) is covered with ventilation holes (5) that run through its upper and lower sides. The top of the test platform (2) is provided with a connector (6) for electrically connecting the coil (1). The heating power supply (3) is electrically connected to the connector (6). The top of the test platform (2) is covered with a box cover (7). The periphery of the test platform (2) is provided with a support frame (8). The middle of the top of the support frame (8) is provided with a drive mechanism (9) for driving the box cover (7) to open / close. The bottom of the test platform (2) is provided with an air supply mechanism and a cooling mechanism. The top of the box cover (7) is provided with an exhaust mechanism. The controller is electrically connected to the heating power supply (3), the temperature sensor (4), the drive mechanism (9), the air supply mechanism, the cooling mechanism, and the exhaust mechanism.

2. The heating and cooling cycle device of a large coil according to claim 1, wherein The drive mechanism (9) includes a lead screw (10) connected to the housing cover (7), and the top of the support frame (8) is rotatably provided with a lead screw nut seat (11) threadedly connected to the lead screw (10) and a motor (12) that drives the lead screw nut seat (11) to rotate. The controller is electrically connected to the motor (12).

3. The heating and cooling cycle device of a large coil according to claim 1, wherein The drive mechanism (9) is an electric push rod, a pneumatic cylinder, an electric hydraulic cylinder, or an electric hoist.

4. The heating and cooling cycle device for a large coil according to claim 1, wherein The test platform (2) is provided with a guide rail (13) that is slidably connected to the box cover (7).

5. The heating and cooling cycle device for a large coil according to claim 1, wherein The inner wall of the box cover (7) is provided with a heat insulation layer.

6. The heating and cooling cycle device of a large coil according to claim 1, wherein The air supply mechanism includes multiple blowers (14) evenly arranged at the bottom of the test platform (2), and the controller is electrically connected to the blowers (14).

7. The heating and cooling cycle device of a large coil according to claim 1, wherein The refrigeration mechanism includes cooling coils (15) located below the air supply mechanism and evenly distributed. A refrigeration unit (16) is provided on the outside of the test platform (2). The refrigeration unit (16) sends cold air into the cooling coils (15) through an axial flow fan (17). The controller is electrically connected to the refrigeration unit (16) and the axial flow fan (17).

8. The heating and cooling cycle device of a large coil according to claim 1, wherein The ventilation mechanism includes a plurality of exhaust fans (18) evenly arranged on the top of the housing cover (7), and the controller is electrically connected to the exhaust fans (18).

9. The heating and cooling cycle device of a large coil according to claim 1, wherein The temperature sensor (4) is a thermocouple (19) in contact with the coil (1), or an infrared temperature sensor installed on the inner wall of the housing cover (7).

10. The heating and cooling cycle device of a large coil according to any one of claims 1 to 9, characterized by, It also includes an over-temperature protector, an alarm (20) electrically connected to the over-temperature protector, the probe (21) of the over-temperature protector being in contact with the coil (1), the alarm (20) being mounted on the housing cover (7) or support frame (8), and the controller being electrically connected to the over-temperature protector.

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