Controllable current limiting device with multi-time automatic reclosing function

Abstract

The invention relates to the technical field of electric power, and particularly discloses a controllable current limiting device with a multi-time automatic reclosing function, which comprises a controller, the number of the power supply system modules is three, and loops are formed between the three power supply system modules and the controller through wires respectively; the circuit breaker is respectively connected with the three power supply system modules through three wires and is used for quickly cutting off a circuit and closing; and the electric reactor is connected with the circuit breaker in the electric power system, and when short circuit occurs, the electric reactor increases the impedance of a short-circuit loop by using the inductance characteristic of the electric reactor so as to limit the magnitude of short-circuit current. Impedance of a short-circuit loop is increased through the electric reactor by utilizing inductance characteristics of the electric reactor, so that the short-circuit current is limited, impact of the short-circuit current on power equipment and a system is reduced, and when the short-circuit current exceeds a rated value of the circuit breaker, the circuit breaker can quickly cut off the circuit to prevent the current from continuously flowing through a fault point; and the safety of power equipment and a system is protected.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a current limiting device with controllable and multiple automatic reclosing functions. Background Art

[0002] The current limiting device, as an electrical component or device, is mainly used to limit the flow of current to protect circuits and electrical equipment from damage caused by excessive current. Its working principle is usually to limit the flow of current by introducing additional resistance or other forms of impedance. When the current exceeds the set threshold, the current limiting device will automatically start, thereby protecting the components in the circuit from adverse conditions such as overload and short circuit faults. One of the important components in the current limiting device is the reactor. When the reactor is in use, it will generate heat, which is determined by its working principle and physical properties. As an important component in the power system, the reactor is mainly used to limit the rate of change of current, filter harmonics, and suppress voltage fluctuations. During use, energy conversion and loss will occur inside the reactor, thereby generating heat. When the load current increases, the current in the reactor will also increase accordingly, thereby increasing the winding loss and core loss, and increasing the heat generated by the reactor;

[0003] For example, the prior art publication number "CN102664393B" discloses a patent named "short-circuit current limiting device", which reduces the short-circuit current by connecting a current-limiting inductor to a short-circuit loop. It has the characteristics of fast response speed and can quickly and effectively limit the short-circuit current of the power grid system in conjunction with a relay protection device.

[0004] The reactor of the existing device is usually exposed to the air. The advantage of exposing the reactor to the air is that the cold air of nature can be used to dissipate the heat, and good heat dissipation performance can be obtained. However, the disadvantage is that, precisely because the reactor is always exposed to the air, the fine dust particles in the air will also be adsorbed on the surface of the reactor due to the effect of electrostatic adsorption, causing the cooling fins on the surface of the reactor to be blocked by dust, affecting the heat dissipation performance of the reactor itself, so it needs to be improved. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] The present invention provides a controllable current limiting device with multiple automatic reclosing functions, which can solve the problem of excessive heating of the reactor. The specific scheme is as follows:

[0007] A current limiting device with controllable and multiple automatic reclosing functions, comprising:

[0008] Controller;

[0009] There are three power system modules, and the three power system modules respectively form a loop with the controller through wires;

[0010] The circuit breaker is connected to the three power system modules through three wires respectively, and is used to quickly cut off the circuit and close the circuit;

[0011] The reactor is connected to the circuit breaker in the power system. When a short circuit occurs, the reactor increases the impedance of the short circuit loop by using its inductance characteristics to limit the magnitude of the short circuit current. A heat dissipation component is provided outside the reactor, and the heat dissipation component includes:

[0012] first side panel;

[0013] A second side plate, wherein the second side plate and the first side plate are symmetrically mounted on both sides of the reactor, and the first side plate and the second side plate can surround the reactor;

[0014] A fan housing, fixedly mounted on one end of the first side plate and the second side plate;

[0015] The fan blade has a rotating shaft in the middle thereof rotatably mounted at one end of the fan housing through a bearing;

[0016] An air outlet is formed at the other end of the first side plate and the second side plate, and hot air after the cold air blown in by the fan blades undergoes heat exchange with the reactor is discharged from the air outlet to form a heat dissipation duct.

[0017] Preferably, a support base is provided under the controller, and the controller is fixedly mounted on the support base. The support base is made of insulating material, and a plurality of long grooves penetrating both ends of the support base are provided on the top of the support base. The plurality of long grooves can allow external air to flow therein to dissipate heat for electrical components on the support base.

[0018] Preferably, the tops of the first side plate and the second side plate are open in design, and the heat generated by the reactor can be discharged from the open openings at the tops of the first side plate and the second side plate.

[0019] Preferably, a slider is connected to the bottom of the first side plate and the second side plate, and the slider is slidably installed in the long groove on the top of the support seat.

[0020] Preferably, one end of the fan blade is connected to a motor, and when the fan blade rotates, external air can be sucked into the fan housing, and the wind is blown toward the outer wall of the reactor to dissipate heat from the surface of the reactor.

[0021] Preferably, an air inlet is provided at the air inlet end of the fan housing, and a filter is fixedly installed inside the air inlet, and the filter is used to filter dust in the external air.

[0022] Preferably, the inner walls of the first side panel and the second side panel are connected with an arc-shaped plate, which guides the wind to the side of the reactor. An opening is provided at one end of the arc-shaped plate near one end of the air outlet slot. When the wind blows toward the arc-shaped plate near one end of the air outlet slot, the wind blows toward the next arc-shaped plate through the opening, thereby allowing the wind to blow evenly toward both sides of the reactor.

[0023] Preferably, a reciprocating assembly is installed on the heat sink fin, and the reciprocating assembly includes:

[0024] An annular member is installed in the gap between two adjacent heat dissipation fins, and the width of the annular member matches the width of the gap between the two adjacent heat dissipation fins;

[0025] The heat-conducting column is connected to both ends of the plurality of annular parts, and can fix the plurality of annular parts into one body so that the plurality of annular parts can move synchronously. A heat-conducting cavity is provided inside the heat-conducting column, and the heat-conducting cavity is filled with heat-conducting liquid.

[0026] Preferably, through holes are opened on both sides of the annular member, and there are a plurality of through holes. When the annular member moves back and forth, the inner side of the annular member can scrape off dust on the side walls of the cooling fins and the outer wall of the reactor, so that the reactor and the cooling fins on its surface remain clean.

[0027] Preferably, the reciprocating assembly further comprises:

[0028] A rack fixedly connected to the bottom of the heat-conducting column;

[0029] A residual gear is arranged on one side of the rack, the residual gear is meshed with the rack, and the residual gear is rotatably connected to the upper and lower ends of the reactor through a rotating rod in the middle thereof;

[0030] The blade is connected to the top of the residual gear, and the wind blown out of the air outlet slot can blow to one side of the blade, driving the blade to rotate in one direction;

[0031] A sliding rod is connected to one end of one of the heat-conducting columns, and a spring is sleeved on the outside of the sliding rod. The bottom of the reactor is connected to a limiting seat, and the sliding rod is slidably connected to one end of the limiting seat. The two ends of the spring are respectively connected to one end of the heat-conducting column and one end of the limiting seat. The bottom of the heat-conducting column is connected to a limiting rod, and the limiting rod is slidably connected to the limiting seat.

[0032] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0033] 1. The inductance characteristics of the reactor are used to increase the impedance of the short-circuit loop, thereby limiting the size of the short-circuit current, which helps to reduce the impact of the short-circuit current on power equipment and systems. When the short-circuit current exceeds the rated value of the circuit breaker, the circuit breaker will quickly cut off the circuit to prevent the current from continuing to flow through the fault point, thereby protecting the safety of power equipment and systems.

[0034] 2. The controller samples the data of the three power system modules in real time and determines which group or groups have completed energy storage and can execute actions at any time. In this way, it can accept external commands or internal automatic logic commands to drive the closing and opening actions of the circuit breaker, and can realize automatic and unlimited cyclic actions within a certain interval period.

[0035] 3. By setting up the annular component and the heat-conducting column, the heat of the reactor can be transferred to the annular component first, and then the heat of the annular component is transferred to the heat-conducting column. Finally, the wind blows to the heat-conducting column to dissipate the heat, thereby achieving the purpose of efficient heat dissipation.

[0036] 4. The remaining gear drives the rack and the heat-conducting column to move to one side. When the rack reaches the limit position, the teeth of the remaining gear separate from the teeth of the rack. Under the restoring action of the spring, the rack and the heat-conducting column return to the other side. When the remaining gear continues to rotate until it can mesh with the rack, the remaining gear continues to drive the rack and the heat-conducting column to move back and forth, so that the heat-conducting column and the ring move back and forth along the side of the heat sink fin. When the ring moves back and forth along one side of the heat sink fin, the dust on the side of the heat sink fin can be brought out, thereby cleaning the heat sink fin.

[0037] Other features and advantages of the present invention will be described in the following description, and part of them will become obvious from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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 labor. Among them:

[0039] Figure 1 It is an overall stereogram of the present invention;

[0040] Figure 2 It is another perspective stereogram of the present invention;

[0041] Figure 3An exploded view of the heat dissipation assembly of the present invention;

[0042] Figure 4 An exploded view of the heat dissipation assembly of the present invention from another perspective;

[0043] Figure 5 is a top view of the heat dissipation assembly of the present invention;

[0044] Figure 6 is a top cross-sectional view of a fan housing of the present invention;

[0045] Figure 7 It is a three-dimensional partial cross-sectional view of the fan housing of the present invention;

[0046] Figure 8 is a cross-sectional view of the fan housing of the present invention from another viewing angle;

[0047] Fig. 9 It is a position change diagram of the reciprocating assembly of the present invention;

[0048] Fig.10 For the present invention Fig. 9 Enlarged view of point A in the middle;

[0049] Fig.11 is a three-dimensional diagram of the reactor of the present invention;

[0050] Fig.12 A partial cross-sectional view of the annular member of the present invention;

[0051] Fig.13 is a three-dimensional diagram of the ring member of the present invention;

[0052] Fig.14 A top view of the reciprocating assembly of the present invention;

[0053] Fig.15 It is a circuit connection schematic diagram of the present invention.

[0054] The reference numerals are as follows:

[0055] 101. controller; 102. power system module; 103. circuit breaker; 104. protective shell; 105. reactor; 106. heat sink fins; 2. heat dissipation assembly; 201. first side panel; 202. second side panel; 203. mounting slot; 204. air outlet; 205. bolt; 206. fan housing; 207. fan blade; 208. air inlet; 209. filter element; 210. motor; 211. air outlet slot; 212. convex surface; 213. arc plate; 214. through opening; 3. support seat; 4. reciprocating assembly; 401. annular member; 402. heat conducting column; 403. heat conducting cavity; 404. through hole; 405. rack; 406. residual gear; 407. blade; 408. sliding rod; 409. spring; 410. limit seat; 411. limit rod. DETAILED DESCRIPTION

[0056] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used to explain the principles of the present invention together with the embodiments of the present invention.

[0057] Example 1: See Figure 1 , Figure 2 , Fig.15 This embodiment provides a controllable and multiple automatic reclosing current limiting device, which has the functions of controllable, automatic reclosing and zero-loss deep current limiting, and includes the following parts:

[0058] The controller 101 is fixedly mounted on the support base 3, and the support base 3 is made of insulating material;

[0059] The power system modules 102 have three components. The three power system modules 102 form a loop with the controller 101 through wires. The controller 101 and the three power system modules 102 are connected to an AC220V power supply through a transformer, and are converted into a stable DC220V power supply through the transformer to provide power for the controller 101 and the power system modules 102.

[0060] The circuit breaker 103 is connected to the three power system modules 102 through three wires respectively, and is used for quickly cutting off the circuit and closing the circuit. A protective shell 104 is fixedly installed on the outside of the circuit breaker 103;

[0061] In the above scheme: the controller 101 will sample the data of the three power system modules 102 in real time, and determine which group or groups have completed energy storage and can execute actions at any time, so that it can accept external commands or internal automatic logic commands to drive the closing and opening actions of the circuit breaker 103, and can realize automatic and unlimited cyclic actions within a certain interval period;

[0062] Reactor 105 is connected to circuit breaker 103 in the power system. When a short circuit occurs, reactor 105 increases the impedance of the short circuit loop by using its inductance characteristics, thereby limiting the magnitude of the short circuit current, which helps to reduce the impact of the short circuit current on power equipment and systems. When the short circuit current exceeds the rated value of circuit breaker 103, circuit breaker 103 will quickly cut off the circuit to prevent the current from continuing to flow through the fault point, thereby protecting the safety of power equipment and systems.

[0063] When a large current passes through the reactor 105, the reactor will heat up. This is because the reactor 105 mainly plays the role of limiting the current change rate or providing reactive power compensation in the power system, and it is an inductor element, which consists of a coil and an iron core (if any). When a large current passes through the coil of the reactor 105, the following effects that cause heating will occur:

[0064] Joule heating effect: According to Joule's law, when current passes through a conductor, heat is generated. The amount of heat is proportional to the square of the current, the resistance of the conductor, and the power-on time. The coil of the reactor 105 is wound by a wire, and the wire itself has a certain resistance. Therefore, when a large current passes through, a large amount of heat will be generated in the wire.

[0065] Hysteresis loss: The iron core (if any) of the reactor 105 will be repeatedly magnetized in the alternating magnetic field. In this process, part of the energy will be lost in the form of heat energy, which is called hysteresis loss. Although the proportion of hysteresis loss in the reactor 105 may not be as large as the Joule heating effect, it is also a factor that causes the reactor 105 to heat up.

[0066] Eddy current loss: When an alternating current passes through the coil of the reactor 105, an alternating magnetic flux is generated in the iron core. This alternating magnetic flux will induce eddy currents in the iron core, and when the eddy currents flow in the iron core, they will also generate heat, which is called eddy current loss. Eddy current loss is also a reason for the heating of the reactor 105;

[0067] In summary, when a large current passes through the inductor 105, the inductor 105 will generate heat due to the combined effects of Joule heating effect, hysteresis loss and eddy current loss. In order to ensure the normal operation of the inductor 105 and extend its service life, it is usually necessary to take heat dissipation measures, such as increasing the heat dissipation area, using heat sinks, etc., so as to dissipate the heat generated by the inductor 105 in time.

[0068] Embodiment 2: In order to achieve efficient heat dissipation of the reactor 105, the technical solution of this embodiment is different from that of the embodiment 1 in that a heat dissipation component 2 is provided outside the reactor 105, such as Figure 3 , Figure 4 As shown, the heat dissipation component 2 includes the following parts:

[0069] The first side plate 201 and the second side plate 202 are symmetrically mounted on both sides of the reactor 105. The first side plate 201 and the second side plate 202 can surround the reactor 105. However, a heat dissipation space is formed between the outer wall of the reactor 105 and the inner walls of the first side plate 201 and the second side plate 202. The tops of the first side plate 201 and the second side plate 202 are open. The heat generated by the reactor 105 can be discharged from the open openings at the tops of the first side plate 201 and the second side plate 202 to achieve a heat dissipation effect.

[0070] In order to achieve air circulation, Figure 1 , Figure 2As shown, a plurality of long slots penetrating the two ends of the support seat 3 are provided on the top of the support seat 3. By providing a plurality of long slots, the external air can flow therein, dissipate the heat of the electrical components on the support seat 3, and take away the heat to achieve the heat dissipation effect. When the external cold air passes under the first side plate 201 and the second side plate 202, the cold air exchanges heat with the reactor 105 to form hot air. According to the principles of thermodynamics and fluid mechanics, a part of the hot air will rise from the inside of the first side plate 201 and the second side plate 202, and then be discharged from the open ports above the two, thereby achieving the purpose of heat dissipation. The specific principle is as follows:

[0071] The relationship between temperature and density: Under the same pressure, the higher the temperature of the gas, the greater the average kinetic energy of its molecules, which leads to an increase in the average distance between gas molecules, that is, the volume of the gas expands and the density decreases. On the contrary, the gas with a lower temperature has a greater density;

[0072] The role of buoyancy: According to Archimedes' principle, any object surrounded by a fluid (such as a gas or liquid) will experience an upward buoyancy equal to the weight of the fluid it displaces. Since the density of hot air is less than that of cold air, when hot air is surrounded by cold air, the buoyancy it experiences is greater than its gravity, so it will float upward.

[0073] Convection phenomenon: When hot air rises, the surrounding cold air will flow in to fill the space it leaves. This gas flow caused by temperature differences is called convection;

[0074] In order to achieve more efficient heat exchange, the material of the first side plate 201 and the second side plate 202 can be set to a high-performance thermal conductive material, and special shapes can be set on the surfaces of the two (for example, multiple convex parts or concave parts are set to increase the heat exchange area), so as to further improve the heat dissipation effect. It should be noted that the material of the first side plate 201 and the second side plate 202 can be: copper, aluminum, and alloy materials formed by them and other metal materials, graphite or high thermal conductivity ceramics;

[0075] like Figure 3 As shown, a slider is connected to the bottom of the first side plate 201 and the second side plate 202, and the slider can be slidably installed in the long groove on the top of the support seat 3, and then further fixed by a connecting piece. The two ends of the first side plate 201 and the second side plate 202 are fixed by bolts 205.

[0076] Embodiment 3: Figure 3 , Figure 4 , Figure 5 As shown, the technical solution of this embodiment is different from that of the second embodiment in that an active heat dissipation component is provided on one side of the reactor 105, and the active heat dissipation component includes the following parts:

[0077] The fan housing 206 is fixedly mounted on one end of the first side plate 201 and the second side plate 202. In order to fit with the fan housing 206, a mounting groove 203 is formed on one end of the first side plate 201 and the second side plate 202. The outer wall of the fan housing 206 can be fixed in the mounting groove 203.

[0078] The fan blade 207 has a rotating shaft in the middle thereof rotatably mounted on one end of the fan housing 206 via a bearing. Figure 6 As shown, one end of the fan blade 207 is connected to the motor 210. When the fan blade 207 rotates, it can inhale external air and blow the wind toward the reactor 105, so as to dissipate heat on the surface of the reactor 105. The other end of the first side plate 201 and the second side plate 202 is formed with an air outlet 204. The hot air after the cold air blown in by the fan blade 207 and the reactor 105 undergo heat exchange can be discharged from the air outlet 204, so as to form a heat dissipation air duct;

[0079] like Figure 6 , Figure 7 , Figure 8 As shown, the active heat dissipation component also includes:

[0080] The filter element 209 is installed at the air inlet end of the fan housing 206. The air inlet end of the fan housing 206 is provided with an air inlet 208. The filter element 209 is snap-fitted and installed in the air inlet 208 to filter dust in the external air. Furthermore, the filter element 209 may have multiple filter elements 209, which may include filter cotton, electrostatic adsorption plates, activated carbon and other components capable of filtering fine particles. One end of the fan blade 207 is rotatably installed in the middle of the filter element 209.

[0081] like Figure 6 As shown, in order to allow the wind generated by the fan blades 207 to blow toward both sides of the reactor 105, a convex surface 212 is provided on the inner wall of the fan housing 206 at one end close to the reactor 105, and an air outlet slot 211 is opened at the end of the fan housing 206 close to the reactor 105. Through the above structure, when the fan blades 207 generate wind, the wind can be blown out from the air outlet slots 211 at both ends of the fan housing 206, blow toward the inner walls of the first side plate 201 and the second side plate 202, and then bounce back to the side of the reactor 105, thereby dissipating heat on both sides of the reactor 105.

[0082] like Figure 5As shown, the inner walls of the first side plate 201 and the second side plate 202 are connected with an arc plate 213, which can direct wind force to the side of the reactor 105. One end of the arc plate 213 close to one end of the air outlet slot 211 is provided with a through opening 214. When wind blows toward the arc plate 213 close to one end of the air outlet slot 211, the wind blows toward the next arc plate 213 through the through opening 214, so that the wind force is evenly blown toward both sides of the reactor 105, thereby achieving the purpose of efficient heat dissipation.

[0083] Embodiment 3: The technical solution of this embodiment is different from that of Embodiment 2 in that a reciprocating assembly 4 is installed on the heat dissipation fins 106 on the outer wall of the reactor 105. The reciprocating assembly 4 includes the following parts:

[0084] The ring member 401 is installed in the gap between two adjacent heat sink fins 106, and the width of the ring member 401 matches the width of the gap between two adjacent heat sink fins 106. Fig. 9 As shown, the ring member 401 can reciprocate along the direction of the hollow arrow, as shown in FIG. Fig.12 As shown, there are a plurality of annular members 401, and each of the plurality of annular members 401 matches the gap between two adjacent heat sink fins 106;

[0085] The heat-conducting column 402 is connected to both ends of the plurality of ring members 401, and can fix the plurality of ring members 401 into one body, so that the plurality of ring members 401 can move synchronously. A heat-conducting cavity 403 is provided inside the heat-conducting column 402, and the heat-conducting cavity 403 is filled with heat-conducting liquid. State 1: When the ring member 401 is in Fig. 9 In the middle left state, the rear end of the ring 401 is located inside two adjacent heat sink fins 106 at the rear end of the reactor 105, and the front end of the ring 401 is located outside the heat sink fins 106; State 2: When the ring 401 is in Fig. 9 In the middle right state, the rear end of the annular member 401 is located outside the heat dissipation fins 106, and the front end of the annular member 401 is located inside two adjacent heat dissipation fins 106 at the front end of the reactor 105;

[0086] In the above scheme, by providing the annular member 401 and the heat-conducting column 402, the heat of the reactor 105 can be first transferred to the annular member 401, and then the heat of the annular member 401 is transferred to the heat-conducting column 402, and finally the wind blows to the heat-conducting column 402 to dissipate the heat, thereby achieving the purpose of efficient heat dissipation;

[0087] like Fig.12 As shown, through holes 404 are provided on both sides of the annular member 401. The through holes 404 include a plurality of through holes 404. The through holes 404 may be perpendicular to the annular member 401 or may form an angle ( Fig.12The advantage of providing the through hole 404 is that when the ring 401 moves back and forth, the dust on the side walls of the heat sink fins 106 and the outer wall of the reactor 105 can be scraped off through the inner side of the ring 401, so that the reactor 105 and the heat sink fins 106 on its surface are kept clean, thereby ensuring good heat dissipation performance.

[0088] like Fig.10 , Fig.11 , Fig.12 , Fig.13 , Fig.14 As shown, as a way to drive the annular member 401 to move back and forth, the following components may be included:

[0089] The rack 405 is fixedly connected to the bottom of the heat conducting column 402;

[0090] The residual gear 406 is arranged on one side of the rack 405, the residual gear 406 is meshed with the rack 405, and the residual gear 406 is rotatably connected to the upper and lower ends of the reactor 105 through a rotating rod in the middle thereof;

[0091] The blade 407 is connected to the top of the residual gear 406. The wind blown out of the air outlet slot 211 can blow to one side of the blade 407, driving the blade 407 to rotate in one direction. When the blade 407 rotates in one direction, it can drive the residual gear 406 to rotate. When the residual gear 406 rotates, it can drive the rack 405 to move synchronously, thereby driving the heat conducting column 402 and the plurality of ring members 401 to move to one side.

[0092] In order to allow the rack 405, the heat-conducting column 402 and the ring 401 to return to the opposite direction after moving to one side, the following components can be provided:

[0093] A sliding rod 408 is connected to one end of one of the heat-conducting columns 402, and a spring 409 is sleeved on the outside of the sliding rod 408. The bottom of the reactor 105 is connected to a limit seat 410, and the sliding rod 408 is slidably connected to one end of the limit seat 410. The two ends of the spring 409 are respectively connected to one end of the heat-conducting column 402 and one end of the limit seat 410. The bottom of the heat-conducting column 402 is connected to a limit rod 411, and the limit rod 411 is slidably connected to the limit seat 410.

[0094] Through the above scheme, when the remaining gear 406 drives the rack 405 and the heat-conducting column 402 to move to one side and reach the limit position, the teeth of the remaining gear 406 are separated from the teeth of the rack 405, and then under the restoring action of the spring 409, the rack 405 and the heat-conducting column 402 return to the other side. When the remaining gear 406 continues to rotate until it can engage with the rack 405, the remaining gear 406 continues to drive the rack 405 and the heat-conducting column 402 to move, and so on, so that the heat-conducting column 402 and the ring 401 move back and forth along the side of the heat sink 106. When the ring 401 moves along one side of the heat sink 106, the dust on the side of the heat sink 106 can be brought out, thereby achieving the purpose of cleaning the heat sink 106.

[0095] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0096] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A current limiting device with controllable and multiple automatic reclosing function, characterized in that: include: Controller (101); The power system modules (102) are three in number, and the three power system modules (102) are connected to the controller (101) via wires to form a loop. A circuit breaker (103) is connected to the three power system modules (102) through three wires respectively, and is used for quickly cutting off the circuit and closing the circuit; A reactor (105) is provided with heat dissipation fins (106) on its surface and is connected to the circuit breaker (103) in the power system. When a short circuit occurs, the reactor (105) increases the impedance of the short circuit loop by using its inductance characteristics to limit the magnitude of the short circuit current. A heat dissipation component (2) is provided outside the reactor (105), and the heat dissipation component (2) comprises: A first side plate (201); A second side plate (202), wherein the second side plate (202) and the first side plate (201) are symmetrically mounted on both sides of the reactor (105), and the first side plate (201) and the second side plate (202) are capable of surrounding the reactor (105); A fan housing (206) is fixedly mounted on one end of the first side plate (201) and the second side plate (202), and an air outlet slot (211) is provided at one end of the fan housing (206) close to the reactor (105); The fan blade (207) has a rotating shaft in the middle thereof rotatably mounted on one end of the fan housing (206) via a bearing; An air outlet (204) is formed at the other end of the first side plate (201) and the second side plate (202), and hot air is discharged from the air outlet (204) after heat exchange between the cold air blown in by the fan blades (207) and the reactor (105), thereby forming a heat dissipation air duct.

2. A current limiting device with controllable and multiple automatic reclosing function as claimed in claim 1, characterized in that: A support base (3) is provided below the controller (101), and the controller (101) is fixedly mounted on the support base (3). The support base (3) is made of insulating material, and a plurality of long slots penetrating through two ends of the support base (3) are provided on the top of the support base (3). The plurality of long slots can allow external air to flow through the slots to dissipate heat from electrical components on the support base (3).

3. A current limiting device with controllable and multiple automatic reclosing function as claimed in claim 1, characterized in that: The tops of the first side plate (201) and the second side plate (202) are open in design, and the heat generated by the reactor (105) can be discharged from the open openings at the tops of the first side plate (201) and the second side plate (202).

4. A current limiting device with controllable and multiple automatic reclosing function as claimed in claim 2, characterized in that: The bottoms of the first side plate (201) and the second side plate (202) are connected with sliding blocks, and the sliding blocks are slidably mounted in the long grooves at the top of the support seat (3).

5. A current limiting device with controllable and multiple automatic reclosing function as claimed in claim 1, characterized in that: One end of the fan blade (207) is connected to a motor (210). When the fan blade (207) rotates, external air can be sucked into the fan housing (206) and the wind can be blown toward the outer wall of the reactor (105) to dissipate heat from the surface of the reactor (105).

6. A current limiting device with controllable and multiple automatic reclosing function as claimed in claim 1, characterized in that: The air inlet end of the fan housing (206) is provided with an air inlet (208), and a filter element (209) is fixedly installed inside the air inlet (208), and the filter element (209) is used to filter dust in the external air.

7. A current limiting device with controllable and multiple automatic reclosing function as claimed in claim 1, characterized in that: The inner walls of the first side plate (201) and the second side plate (202) are connected with an arc-shaped plate (213), and the arc-shaped plate (213) guides wind toward the side of the reactor (105). An opening (214) is provided at one end of the arc-shaped plate (213) close to one end of the air outlet slot (211). When wind blows toward the arc-shaped plate (213) close to one end of the air outlet slot (211), the wind blows toward the next arc-shaped plate (213) through the opening (214), thereby allowing the wind to blow evenly toward both sides of the reactor (105).

8. A current limiting device with controllable and multiple automatic reclosing function as claimed in claim 1, characterized in that: A reciprocating assembly (4) is mounted on the heat dissipation fin (106), and the reciprocating assembly (4) comprises: An annular member (401) is installed in a gap between two adjacent heat dissipation fins (106), and a width of the annular member (401) matches a width of the gap between the two adjacent heat dissipation fins (106); The heat-conducting column (402) is connected to both ends of the plurality of annular members (401) and can fix the plurality of annular members (401) into one body so that the plurality of annular members (401) can move synchronously. A heat-conducting cavity (403) is provided inside the heat-conducting column (402) and a heat-conducting liquid is contained in the heat-conducting cavity (403).

9. A current limiting device with controllable and multiple automatic reclosing function as claimed in claim 8, characterized in that: Through holes (404) are provided on both sides of the annular member (401), and the through holes (404) have a plurality of through holes (404). When the annular member (401) moves back and forth, the inner side of the annular member (401) can scrape away dust on the side walls of the heat dissipation fins (106) and the outer wall of the reactor (105), so that the reactor (105) and the heat dissipation fins (106) on its surface are kept clean.

10. A current limiting device with controllable and multiple automatic reclosing function as claimed in claim 9, characterized in that: The reciprocating assembly (4) further comprises: A rack (405) fixedly connected to the bottom of the heat-conducting column (402); A residual gear (406) is arranged on one side of the rack (405), the residual gear (406) is meshed with the rack (405), and the residual gear (406) is rotatably connected to the upper and lower ends of the reactor (105) through a rotating rod in the middle thereof; The blade (407) is connected to the top of the residual gear (406), and the wind blown out of the air outlet slot (211) can blow toward one side of the blade (407), driving the blade (407) to rotate in one direction; A sliding rod (408) is connected to one end of one of the heat-conducting columns (402), and a spring (409) is sleeved on the outside of the sliding rod. The bottom of the reactor (105) is connected to a limiting seat (410), and the sliding rod (408) is slidably connected to one end of the limiting seat (410). The two ends of the spring (409) are respectively connected to one end of the heat-conducting column (402) and one end of the limiting seat (410). The bottom of the heat-conducting column (402) is connected to a limiting rod (411), and the limiting rod (411) is slidably connected to the limiting seat (410).

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