Brake device

Abstract

The utility model provides a braking device, and relates to the technical field of flywheel energy storage, the braking device comprises an incoming line switch, one end of the incoming line switch is used for being connected to a power supply bus in parallel, and the power supply bus is used for providing power for a flywheel; and the brake unit comprises at least two brake branches, each brake branch comprises a brake resistor and a brake switch, one end of the brake switch is connected to the other end of the wire inlet switch, the other end of the brake switch is connected to one end of the brake resistor in the brake branch, and the other end of the brake resistor is grounded. According to the brake device, the brake device can be adjusted.

Description

Technical Field

[0001] This utility model relates to the technical field of flywheel energy storage, and in particular to a braking device. Background Technology

[0002] In recent years, new energy storage technologies have developed rapidly, among which flywheel energy storage technology has attracted particular attention. As a physical energy storage method, flywheel energy storage relies on a high-speed rotating flywheel rotor under vacuum magnetic levitation to store energy. In a magnetic levitation flywheel energy storage device, electrical energy and kinetic energy can be efficiently converted. During charging, the motor mode converts electrical energy into kinetic energy, and the flywheel speed can reach tens of thousands of revolutions per minute. During discharging, the generator mode converts kinetic energy back into electrical energy to supply the load. However, when the flywheel energy storage system encounters emergencies such as the main circuit not being able to flow energy in both directions, main circuit failure, or flywheel magnetic levitation falling off, the braking device must be activated to release the flywheel energy. At this time, the main circuit will be cut off, the braking circuit will be activated, and the energy will be rapidly released at the maximum power of the braking device and gradually decrease. However, most braking devices at present are single braking resistors, which cannot achieve regulation. Utility Model Content

[0003] In view of this, this application provides a braking device designed to achieve adjustability of the braking device.

[0004] The braking device provided in this application includes an input switch, one end of which is connected in parallel to a power supply bus, the power supply bus being used to provide power to the flywheel; and a braking unit, the braking unit including at least two braking branches, each braking branch including a braking resistor and a braking switch, one end of which is connected to the other end of the input switch, the other end of which is connected to one end of the braking resistor in its respective braking branch, and the other end of which is grounded.

[0005] Preferably, the braking resistor includes a plurality of braking resistors, which are connected in series or in parallel.

[0006] Preferably, the braking circuit includes three circuits, which are connected in parallel.

[0007] Preferably, the braking device further includes a controller, the output of which is connected to the control terminal of the incoming line switch for controlling the incoming line switch.

[0008] Preferably, the braking device further includes: at least two thermocouples, the number of thermocouples being the same as the number of braking branches, the hot junction of each thermocouple being attached to the surface of a corresponding braking resistor for detecting the temperature value of each braking resistor, and the cold junction of each thermocouple being connected to the input terminal of the controller for transmitting the detected temperature value to the controller, wherein the first output terminal of the controller is respectively connected to the first control terminal of the braking switch in each braking branch for controlling the braking switch to be turned on or off according to the temperature value.

[0009] Preferably, the braking device further includes: a digital display connected to the controller for displaying the temperature value of each braking resistor received by the controller from the thermocouple; at least two buttons, the number of buttons being the same as the number of braking switches, one end of each button being connected to the second output terminal of the controller, and the other end of each button being connected to the second control terminal of the corresponding braking switch, so as to control the braking switch to be turned on or off by pressing the button.

[0010] Preferably, the braking device further includes: a cabinet, the cabinet being divided into a first space and a second space by a partition, the first space being used to place the braking unit, the cabinet having a heat dissipation hole formed on the top wall of the first space, the second space being used to place the controller, the at least two thermocouples and the digital display, the cabinet having a through hole formed in the second space so that the incoming line switch can be led out from the through hole.

[0011] Preferably, the braking device further includes a heat insulation plate disposed on the side wall of the first space to insulate the heat generated by the braking resistor.

[0012] Preferably, the braking device further includes: at least one air outlet hole formed on the top wall of the second space; the braking device further includes: at least one centrifugal fan, the number of centrifugal fans being the same as the number of air outlet holes; the at least one centrifugal fan is disposed on the top wall of the cabinet in the second space; the air outlet of each centrifugal fan is connected to a corresponding air outlet hole, for blowing air into the first space to generate airflow, so as to blow the heat generated by the braking resistor out of the cabinet through the heat dissipation hole.

[0013] Preferably, the braking device further includes an air duct connected to the heat dissipation hole, used to guide the heat blown out by the centrifugal fan along the air duct out of the cabinet.

[0014] This application provides a braking device, relating to the technical field of flywheel energy storage. The braking device includes an input switch, one end of which is connected in parallel to a power supply bus, which provides power to the flywheel; and a braking unit, comprising at least two braking branches, each including a braking resistor and a braking switch. One end of the braking switch is connected to the other end of the input switch, and the other end of the braking switch is connected to one end of the braking resistor in its respective braking branch. The other end of the braking resistor is grounded. This application achieves adjustable braking device functionality.

[0015] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the braking device provided in an embodiment of this application is shown;

[0018] Figure 2 A schematic diagram of the flywheel energy storage system provided in an embodiment of this application is shown.

[0019] Reference numerals: 100-Braking device; 101-Braking resistor; 102-Braking switch; 103-Controller; 104-Incoming line switch; 105-Thermocouple; 106-Digital display; 107-Heat insulation plate; 108-Centrifugal fan; 200-Flywheel; 300-Power supply; 301-Grid-side converter; 302-Machine-side converter. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of the embodiments of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Flywheel energy storage technology utilizes a vacuum magnetic levitation flywheel rotor to efficiently convert electrical energy into kinetic energy. During charging, the electric motor mode converts electrical energy into high-speed rotating kinetic energy; during discharging, the generator mode converts kinetic energy back into electrical energy. However, in the event of a main circuit failure or flywheel magnetic levitation detachment, a braking device must be activated to release energy. At this time, the main circuit is cut off, the braking circuit is activated, and energy is released rapidly. However, the temperature of the braking device rises sharply, posing a safety risk to surrounding equipment and the environment.

[0025] like Figure 1 As shown, this application embodiment provides a braking device, including an incoming line switch 104 and a braking unit.

[0026] One end of the incoming line switch 104 is connected to the power supply bus via electrical switch KM1, such as Figure 2 As shown, this application embodiment provides a flywheel energy storage system. The power supply bus connects the power supply 300 and the motor of the flywheel 200. A grid-side converter 301, a machine-side converter 302, a first switch K1, and a second switch K2 are provided between the flywheel 200 and the power supply 300. The first switch K1 is located between the power supply 300 and the grid-side converter 301, and the second switch K2 is located between the grid-side converter 301 and the machine-side converter 302. All switches can be manually controlled.

[0027] Specifically, when the power supply 300 is in normal working condition and provides the required electrical energy to the flywheel 200, the incoming line switch 104 remains open to ensure that electrical energy is smoothly transmitted from the power supply to the flywheel 200. However, when the power supply 300 stops supplying power to the flywheel 200 due to a fault or other reasons, that is, when the flywheel energy storage system encounters a fault or abnormal condition, the incoming line switch 104 is closed to isolate the fault and simultaneously activate the system's braking mechanism.

[0028] The braking unit includes at least two braking branches, each equipped with a braking resistor 101 and a braking switch 102. One end of the braking switch 102 is connected to the other end of the incoming switch 104, and the other end is connected to one end of the braking resistor 101, while the other end of the braking resistor 101 is safely grounded. This design allows excess energy stored in the flywheel 200 to be directed to the braking resistor 101 by operating the braking switch 102 when needed, converting it into heat energy and dissipating it safely, thereby effectively controlling and reducing the speed of the flywheel 200 and ensuring system safety.

[0029] In a preferred embodiment of this application, the braking resistor 101 includes multiple resistors connected in series or parallel. The braking branch can be set to three, and the braking power is determined according to the rotational speed of the flywheel 200. When the flywheel 200 is at high speed, three sets of braking resistors 101 are engaged; when it is at a slightly higher speed, two sets of braking resistors 101 are engaged; and when it is at a low speed, one set of braking resistors is engaged. At the same time, the temperature between the braking resistors 101 in each braking branch can be monitored in real time. When the temperature exceeds the preset temperature protection value, the brake switch 102 on the braking branch that exceeds the preset temperature protection value is opened, and the brake switch 102 on the braking branch that is below the preset temperature protection value is closed, so as to ensure that the braking power is not reduced while significantly reducing the heat generation.

[0030] Preferably, the braking device 100 of this application further includes: a controller 103, an inlet switch 104, a thermocouple 105, a digital display 106, a heat insulation plate 107, and a centrifugal fan 108.

[0031] Specifically, the controller 103 is connected to the control terminal of the incoming line switch 104 and the control terminal of the brake switch 102 in each brake branch, to control the connection status of the incoming line switch 104 and the connection status of the brake switch 102. Thermocouples 105 correspond to the number of brake branches, with each thermocouple 105 attached to the surface of the brake resistor 101 in the corresponding brake branch. Thermocouples 105 are connected to the input terminal of the controller 103 to detect the temperature of the brake resistor 101 in each brake branch.

[0032] The controller 103 can control the opening and closing state of the brake switch 102 according to the temperature of the brake resistor 101 on each brake branch. The controller 103 is equipped with a PLC data acquisition device to collect the operating status of the flywheel energy storage system, the speed of the flywheel 200 unit, the temperature of the control room of the brake device 100, the temperature between the brake resistors 101, the output voltage and output current between the flywheel 200 unit and the brake resistor 101.

[0033] The cabinet is divided into a first space and a second space by a partition. The first space is used to place the braking unit. The cabinet has heat dissipation holes formed on the top wall of the first space. The second space is used to place the controller 103, at least two thermocouples 105 and a digital display 106. The cabinet has a through hole in the second space so that the incoming line switch 104 can be led out from the through hole.

[0034] The digital display 106 is connected to the controller 103 and is used to display the temperature of each braking resistor 101. It can also display data such as the voltage and current between the flywheel 200 and the braking unit, and the temperature between the braking resistors 101. The controller 103 can be connected to at least two buttons, the number of which is the same as the number of brake switches 102. One end of each button is connected to the second output terminal of the controller 103, and the other end of each button is connected to the second control terminal of the corresponding brake switch 102. If a braking resistor 101 exceeds the preset temperature, the brake switch 102 can be turned on or off by pressing the button corresponding to the braking resistor 101.

[0035] The heat insulation plate 107 is disposed on the side wall of the first space to insulate the heat generated by the braking resistor 101. The purpose is to insulate the heat generated by the braking resistor 101 during operation and prevent this heat from adversely affecting other components.

[0036] In this second space, at least one air outlet is formed on the top wall. The number of centrifugal fans 108 is the same as the number of air outlets. At least one centrifugal fan 108 is installed on the top wall of the cabinet in the second space. The air outlet of each centrifugal fan 108 is connected to the corresponding air outlet to blow air into the first space to generate airflow, so as to blow the heat generated by the braking resistor 101 out of the cabinet through the heat dissipation holes.

[0037] The air duct, connected to the heat dissipation holes, ensures that the heat blown out of the cabinet by the centrifugal fan 108 flows out along a specific and efficient path. This helps optimize heat dissipation, reduce heat buildup within the system, thereby extending component lifespan and improving overall system performance.

[0038] This application achieves precise control of the braking process of the flywheel energy storage system. By monitoring key parameters such as flywheel speed and braking resistor temperature in real time, and dynamically adjusting the number and sequence of braking resistors based on these parameters, the heat generated during the braking process is effectively reduced, the braking efficiency is improved, and the system safety is significantly enhanced.

[0039] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims.

Claims

1. A brake device characterized by comprising: The application relates to a brake device for a flywheel. The brake device comprises an incoming line switch, one end of which is connected in parallel to a power supply bus for supplying power to the flywheel; and a brake unit comprising at least two brake branches, each of which comprises a brake resistor and a brake switch, one end of the brake switch being connected to the other end of the incoming line switch, the other end of the brake switch being connected to one end of the brake resistor in the corresponding brake branch, and the other end of the brake resistor being grounded. The brake resistor comprises a plurality of brake resistors connected in series or in parallel.

2. The brake device according to claim 1, characterized by The brake device further comprises:

3. The brake device according to claim 1, characterized by a controller, the output end of which is connected to the control end of the incoming line switch, for controlling the incoming line switch.

4. The brake device according to claim 1, characterized by The brake device further comprises: at least two thermocouples, the number of which is the same as the number of brake branches, the hot end of each thermocouple being attached to the surface of the corresponding brake resistor, for detecting the temperature value of each brake resistor, and the cold end of each thermocouple being connected to the input end of the controller, for transmitting the detected temperature value to the controller, 5. The brake device according to claim 4, characterized in that wherein the first output end of the controller is connected to the first control end of the brake switch in each brake branch, for controlling the conduction or disconnection of the brake switch according to the temperature value. The brake device further comprises: a digital display connected to the controller, for displaying the temperature value of each brake resistor received by the controller from the thermocouples; 6. The brake device according to claim 5, characterized by at least two buttons, the number of which is the same as the number of brake switches, one end of each button being connected to the second output end of the controller, and the other end of each button being connected to the second control end of the corresponding brake switch, for controlling the conduction or disconnection of the brake switch by pressing the button. The brake device further comprises: a cabinet body, which is divided into a first space and a second space by a partition, the first space being used for placing the brake unit, the cabinet body being formed with a heat dissipation through hole in the top wall of the first space, and the second space being used for placing the controller, the at least two thermocouples and the digital display, the cabinet body being formed with a through hole at the second space, so that the incoming line switch is led out from the through hole.

7. The brake device according to claim 6, characterized in that The brake device further comprises: a heat insulation plate arranged on the side wall of the first space, for insulating the heat generated by the brake resistors.

8. The brake device according to claim 7, characterized by The top wall of the second space is formed with at least one air outlet through hole, The brake device further comprises:

9. The brake device according to claim 8, characterized in that at least one centrifugal fan, the number of which is the same as the number of air outlet through holes, the at least one centrifugal fan being arranged on the top wall of the second space of the cabinet body, the air outlet of each centrifugal fan being connected to the corresponding air outlet through hole, for blowing air to generate an air flow to the first space, so that the heat generated by the brake resistors is blown out of the cabinet body through the heat dissipation through hole. The brake device further comprises: an air duct connected to the heat dissipation through hole, for guiding the heat blown out by the centrifugal fan to flow out of the cabinet body along the air duct.

10. The brake device according to claim 9, characterized by ​ ​

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