A heat dissipation device and a zero-loss depth current limiter

Abstract

The present invention belongs to the technical field of electrical equipment, and specifically relates to a heat dissipation device and a zero-loss depth current limiter, the heat dissipation device comprising: a shell, which is cylindrical and has a plurality of exhaust holes spaced apart along the circumferential direction on the cylinder, and one end of which is open and the other end is a fixed portion; an exhaust fan, which is arranged in the shell; an inner frame assembly, which is arranged between the exhaust fan and the inner wall of the shell, and is provided with a plurality of air ducts arranged along the outer circumferential direction of the exhaust fan, and the plurality of air ducts correspond to the exhaust holes, and are used to evenly disperse the blown air from the exhaust fan in the circumferential direction to the outside of the exhaust holes; a plurality of cooling annular pipes, which surround the outer circumferential direction of the exhaust fan and are located in the plurality of air ducts, and are spaced apart from the outside to the inside and from the top to the bottom, and are used to cool the air in the air ducts. The present invention has a reasonable structural arrangement, occupies a small space, has a good heat dissipation effect, and can meet the heat dissipation requirements of the lossless depth current limiting device of a large-capacity system.

Description

Technical Field

[0001] The invention belongs to the technical field of electrical equipment, and in particular relates to a heat dissipation device and a zero-loss depth current limiter. Background Art

[0002] With the growth of modern power system capacity and load levels, coupled with the expansion of power grids, short-circuit current levels in power supply and distribution systems are increasing. As a result, the switching capacity of existing switch circuit breakers in many power grids is no longer able to meet the system's short-circuit current limiting needs. Furthermore, increased short-circuit currents pose numerous threats to the safe and stable operation of power systems. Rapidly switching current-limiting devices to reduce short-circuit current levels is essential to prevent fault expansion and ensure grid safety. Therefore, research on current-limiting devices for high-speed switches is a critical issue that needs to be addressed in power grid systems.

[0003] At present, lossless deep current limiting devices based on fast vacuum circuit breakers have been increasingly used in power systems. During operation, the lossless deep current limiting devices used in large-capacity systems generate heat due to the flow of current in the main circuit, causing the temperature of the conductive part of the device and the internal temperature of the sealed cavity to be unable to reach equilibrium under natural cooling. The existing heat dissipation devices often cannot meet the heat dissipation requirements, resulting in safety hazards caused by overheating when the lossless deep current limiting devices are operated for a long time at high current and full load, causing the current limiter to be prone to electric sparks or open flames, which is prone to fire problems. It also affects the use effect and service life of the current limiter.

[0004] Therefore, it is necessary to provide a new heat dissipation device based on a zero-loss depth current limiter to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defect that the existing heat dissipation device cannot meet the heat dissipation requirements of the lossless deep current limiting device of the large-capacity system, and to provide a heat dissipation device and a zero-loss deep current limiter. The heat dissipation device has a reasonable structure, occupies a small space, has a good heat dissipation effect, and can meet the heat dissipation requirements of the lossless deep current limiting device of the large-capacity system.

[0006] In order to achieve the above objectives, in a first aspect, the present invention provides a heat dissipation device, comprising:

[0007] The shell is cylindrical and has a plurality of exhaust holes spaced apart along the circumferential direction. One end of the shell is open and the other end is closed and provided with a fixing portion for fixing the heat dissipation device.

[0008] an exhaust fan, disposed in the housing;

[0009] an inner frame assembly, which is disposed between the exhaust fan and the inner wall of the housing and is provided with a plurality of air ducts arranged along the outer circumference of the exhaust fan, the plurality of air ducts corresponding to the exhaust holes, and is used to evenly disperse the air blown from the exhaust fan in the circumferential direction to the heat dissipation device outside the exhaust holes;

[0010] A plurality of cooling annular tubes surround the exhaust fan in the outer circumferential direction and are located in a plurality of air ducts. The cooling annular tubes are arranged at intervals from outside to inside and from top to bottom, and are used to cool the air in the air ducts to accelerate heat dissipation.

[0011] In some preferred embodiments, the inner frame assembly includes:

[0012] An inner sleeve, which is sleeved outside the exhaust fan and installed on the housing, and is provided with a plurality of diversion holes;

[0013] A plurality of partition plates are spaced apart along the outer circumference of the inner sleeve, one end of which is connected to the inner sleeve and the other end extends to the shell. Two adjacent partition plates are arranged corresponding to the diversion holes and the exhaust holes to form a plurality of air ducts.

[0014] More preferably, a plurality of partition plates are arranged in a fan shape along the vertical direction of the inner sleeve.

[0015] More preferably, the diversion hole and the exhaust hole in the same air duct are located on the vertical axis of the inner sleeve.

[0016] More preferably, the diversion hole is extended along the height direction of the inner sleeve.

[0017] More preferably, the exhaust hole is plum blossom-shaped and located at the center of the corresponding air duct.

[0018] In some preferred embodiments, the cooling annular pipe comprises an annular pipe with built-in cooling liquid.

[0019] In some preferred embodiments, the heat dissipation device further includes: a heat dissipation element, which is annularly mounted outside the shell and correspondingly arranged in the outer circumferential direction of the exhaust hole.

[0020] Further preferably, the heat dissipation element includes:

[0021] Two annular mounting plates, which are vertically fixedly sleeved outside the shell and are respectively located on both sides of the exhaust hole;

[0022] A plurality of heat dissipation fins are installed between two annular mounting plates and are distributed at intervals. The heat dissipation fins are distributed in an annular shape as a whole.

[0023] In some preferred embodiments, the heat dissipation device further comprises:

[0024] an annular cover plate, which is sleeved on the inner frame assembly and covers the plurality of air ducts;

[0025] a flame retardant assembly mounted on a side of the annular cover plate away from the inner frame assembly;

[0026] A trigger is mounted on the annular cover plate and arranged close to the exhaust fan, and is located on the inner side of the flame retardant component, and is used to trigger the flame retardant component to extinguish the fire when electric sparks or open flames occur.

[0027] Further preferably, the flame retardant assembly includes a mounting frame and an airbag, the airbag contains a fire extinguishing agent, and the airbag is mounted on the annular cover plate through the mounting frame.

[0028] Further preferably, the trigger includes a plurality of heating resistors and a smoke sensor, and the plurality of heating resistors are spaced apart along the inner circumference of the airbag and contact the airbag, and are used to trigger the heating resistors to heat and melt the airbag at the corresponding position when receiving a smoke signal, thereby releasing the fire extinguishing agent to extinguish the fire.

[0029] More preferably, the trigger further includes:

[0030] A mounting tube, which is fixedly mounted on the annular cover plate and extends in a direction perpendicular to the annular cover plate; the smoke sensor is mounted on the mounting tube;

[0031] a ring-shaped wire, which is installed around the outside of the installation cylinder and is electrically connected to the plurality of heating resistors respectively;

[0032] A controller is electrically connected to the ring wire and the smoke sensor respectively, and is mounted on the mounting tube.

[0033] In a second aspect, the present invention provides a zero-loss deep current limiter, comprising the heat dissipation device described in the first aspect.

[0034] The present invention adopts the above technical solution, has a reasonable structure and occupies a small space. The wind from the exhaust fan is formed into several small gusts through the inner frame assembly and enters several annularly distributed air ducts, and then blows from the exhaust hole to the conductive part and the sealed cavity in the heat dissipation device of the current limiter. Since a plurality of cooling annular tubes with decreasing inner diameters are installed in the air duct, the small gusts of wind can be quickly cooled and the heat dissipation effect on the current limiter is enhanced. The wind from the exhaust fan can be stably discharged in an annular, uniformly dispersed manner, so that the current limiter can be quickly and efficiently cooled in all directions inside the heat dissipation device, and the heat dissipation effect is good. The present invention is particularly suitable for the heat dissipation of zero-loss depth current limiters, and can meet the heat dissipation requirements of lossless depth current limiting devices of large-capacity systems, thereby improving the use effect and service life of the current limiter.

[0035] In the scheme of the present invention in which a flame retardant component and a trigger are preferably provided, when the internal components of the current limiter are waiting for the heat dissipation device to have problems such as electric sparks or open flames due to excessive power consumption or excessive heat accumulation, the heat dissipation mechanism can use the trigger to enable the flame retardant component to quickly extinguish the electric sparks or open flames of the internal components of the current limiter from multiple locations in the circumferential direction, thereby greatly improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 A schematic structural diagram of a preferred embodiment of the heat dissipation device provided by the present invention;

[0038] Figure 2 for Figure 1 A schematic diagram of the installation structure of the inner frame assembly in the shell is shown;

[0039] Figure 3 for Figure 2 Schematic diagram of the installation structure of the exhaust fan in the inner frame assembly shown;

[0040] Figure 4 for Figure 1 A schematic diagram of the structure of the flame retardant component on the cover shown;

[0041] Figure 5 for Figure 1 A schematic structural diagram of a partial cross-section of the shell shown.

[0042] Description of Reference Numerals

[0043] 1. Shell; 2. Inner frame assembly; 21. Inner sleeve; 22. Diverter hole; 23. Partition plate; 3. Exhaust hole; 4. Exhaust fan; 5. Cooling annular pipe; 6. Annular cover; 7. Flame retardant assembly; 71. Air bag with built-in heptafluoromethane; 72. Mounting frame; 8. Trigger; 81. Mounting tube; 82. Annular wire; 83. Heating resistor; 84. Smoke sensor; 9. Heat sink; 91. Annular mounting plate; 92. Heat sink fins. DETAILED DESCRIPTION

[0044] In the present invention, unless otherwise specified, directional words such as "up, down, left, right" generally refer to the directions shown in the drawings and actual applications, and "inside and outside" refer to the inside and outside of the outline of the component.

[0045] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0046] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0047] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0048] In a first aspect, the present invention provides a heat dissipation device, such as Figure 1-Figure 5 Shown, including:

[0049] The housing 1 is cylindrical and has a plurality of exhaust holes 3 spaced apart along the circumference of the cylinder. One end of the housing is open, and the other end is closed and provided with a fixing portion for fixing the heat dissipation device.

[0050] an exhaust fan 4, which is arranged in the housing 1;

[0051] an inner frame assembly 2, which is disposed between the exhaust fan 4 and the inner wall of the housing 1 and is provided with a plurality of air ducts (not shown) arranged along the outer circumference of the exhaust fan 4, the plurality of air ducts corresponding to the exhaust holes 3, and configured to uniformly disperse the air blown from the exhaust fan 4 in the circumferential direction to the heat dissipation device outside the exhaust holes 3;

[0052] A plurality of cooling annular tubes 5 surround the exhaust fan 4 in the outer circumferential direction and are located in a plurality of air ducts. The cooling annular tubes 5 are arranged at intervals from outside to inside and from top to bottom, and are used to cool the air in the air ducts to accelerate heat dissipation.

[0053] A fixing flange can be installed on the fixing portion of the housing 1 so as to be installed on a device to be cooled.

[0054] In the present invention, it can be understood that the wind for heat dissipation enters from the open end of the housing 1 and exits from the exhaust duct such as the exhaust hole 3, thereby dissipating the heat to be dissipated from the heat dissipation device.

[0055] Those skilled in the art can install the heat dissipation device of the present invention as needed. For example, during use, the housing 1 can be mounted within the flow limiter using screws, with the exhaust holes 3 on the housing 1 facing the conductive portion of the flow limiter and the sealed cavity. The present invention exhausts air from the housing 1 through an exhaust fan 4 mounted on the inner frame assembly 2. The exhaust air is divided by the inner frame assembly 2 into multiple small streams and then discharged from the housing 1, thereby effectively cooling the conductive portion of the flow limiter and the sealed cavity.

[0056] The cooling annular tubes 5 are arranged at intervals from outside to inside and from top to bottom, such as Figure 5 As shown, it means that no matter in the up and down direction or in the inside and outside direction along the air duct, the cooling annular tubes 5 are arranged at intervals. The cooling annular tubes 5 are distributed in an annular shape with decreasing inner diameter from outside to inside, as shown in FIG. Figure 3 shown.

[0057] In some preferred embodiments, Figure 2 and Figure 3 As shown, the inner frame assembly 2 includes:

[0058] An inner sleeve 21 is sleeved outside the exhaust fan 4 and mounted on the housing 1 and is provided with a plurality of diversion holes 22;

[0059] A plurality of partition plates 23 are spaced apart along the outer circumference of the inner sleeve 21, and one end of each partition plate is connected (preferably fixedly embedded) to the inner sleeve 21, and the other end extends to the shell 1. Two adjacent partition plates 23 are arranged corresponding to the diversion hole 22 and the exhaust hole 3 to form a plurality of air ducts.

[0060] It should be understood that the other end of the partition plate 23 extends to contact the housing 1 for sealing, thereby forming an air duct closed on both sides to prevent air leakage from adjacent air ducts. Preferably, the other end of the partition plate 23 is fixedly embedded in the housing 1.

[0061] The two adjacent partition plates 23 are arranged corresponding to the diversion holes 22 and the exhaust holes 3 to form a plurality of air ducts, which means that in the same air duct, there are two corresponding partition plates 23, and the inner sleeve 21 between the two partition plates 23 is provided with a diversion hole 22, and the shell 1 between the two partition plates 23 is provided with an exhaust hole 3.

[0062] It is understood that the annular tube 5 is fixedly embedded in the partition plate 23 on the inner sleeve 21, and multiple annular tubes 5 with decreasing inner diameters and containing coolant are installed on the partition plate 23. The annular tubes 5 on the partition plate 23 can be increased to multiple annular tubes 5 and distributed in an up-and-down manner, with a certain gap reserved between adjacent annular tubes 5 to allow small gusts of air to pass smoothly.

[0063] Preferably, the exhaust fan 4 has its air outlet facing the other end of the housing 1; more preferably, the exhaust fan 4 is fixedly engaged with the opening of the inner sleeve 21 via a frame, and the exhaust fan 4 has its air outlet facing the bottom of the inner sleeve 21. This preferred solution is more conducive to concentrating the air from the exhaust fan 4 and discharging it from the plurality of diverter holes 22 and their corresponding air ducts and exhaust holes 3, thereby minimizing air leakage from the open end of the housing 1.

[0064] In some specific embodiments of the present invention, the exhaust fan 4 is mounted in the middle of the shell 1 through the inner sleeve 21 in the inner frame assembly 2, and the blown wind enters a number of small air ducts formed by the partition plate 23, and then blows toward the conductive part of the current limiter and the sealed cavity through the plum blossom-shaped exhaust hole 3. Since a plurality of annular tubes 5 with decreasing inner diameters and built-in coolant are installed on the partition plate 23, the small wind can be cooled and the heat dissipation effect on the current limiter is enhanced, and the wind from the exhaust fan 4 can be discharged in a circular shape, so that efficient air cooling can be performed in all directions inside the current limiter.

[0065] More preferably, if Figure 2 As shown, a plurality of partition plates 23 are arranged in a fan shape along the vertical direction of the inner sleeve 21, which is more conducive to sufficient and rapid cooling of the air in the air duct, thereby improving the heat dissipation efficiency.

[0066] More preferably, the inner sleeve 21 is fixedly embedded in the housing 1 and is coaxially arranged with the housing 1 .

[0067] More preferably, the diversion hole 22 and the exhaust hole 3 in the same air duct are located on the vertical axis of the inner sleeve 21, which is more conducive to the rapid in and out of blowing air and accelerates the circulation of air.

[0068] More preferably, the diversion hole 22 is extended along the height direction of the inner sleeve 21 .

[0069] More preferably, the exhaust hole 3 is plum blossom-shaped.

[0070] More preferably, the exhaust hole 3 is located at the center of the corresponding air duct. It can be understood that the exhaust hole 3 is located at the center of the portion of the housing 1 corresponding to the corresponding air duct.

[0071] In some preferred embodiments, the cooling annular pipe 5 comprises an annular pipe with built-in coolant, which can be, for example, an annular copper pipe.

[0072] In some preferred embodiments, the heat dissipation device further includes: a heat dissipation member 9 , which is annularly mounted outside the housing 1 and correspondingly arranged in the outer circumferential direction of the exhaust hole 3 .

[0073] Those skilled in the art can select the specific structure of the heat sink 9 as long as it is conducive to quickly dissipating the cold air coming out of the exhaust hole 3 and concentrating it on the components to be cooled.

[0074] Further preferably, the inventors of the present invention creatively proposed a preferred structure based on the demand for efficient heat dissipation, such as Figure 2 and Figure 5 As shown, the heat sink 9 includes:

[0075] Two annular mounting plates 91 are vertically fixedly sleeved outside the housing 1 and are respectively located on both sides of the exhaust hole 3;

[0076] A plurality of heat dissipation fins 92 are installed between the two annular mounting plates 91 and are spaced apart, and are distributed in an annular shape as a whole. Under this preferred embodiment, the air blown out of the exhaust hole 3 can dissipate heat well after passing through the heat dissipation fins 92, further improving the heat dissipation effect in the flow restrictor.

[0077] The heat dissipation fins 92 preferably have the same specifications.

[0078] Preferably, if Figure 5 As shown, a plurality of heat dissipation fins 92 are arranged perpendicular to the annular mounting plate 91 and are installed on the outer edge of the annular mounting plate 91 .

[0079] In some preferred embodiments, the heat dissipation device further comprises:

[0080] An annular cover plate 6 is sleeved on the inner frame assembly 2 and covers the plurality of air ducts. It can be understood that the annular cover plate 6 covers the gap between the housing 1 and the inner sleeve 21.

[0081] a flame retardant assembly 7, which is mounted on a side of the annular cover plate 6 away from the inner frame assembly 2;

[0082] The trigger 8 is mounted on the annular cover plate 6 and is arranged close to the exhaust fan 4. The trigger 8 is located on the inner side of the flame retardant component 7 and is used to trigger the flame retardant component 7 to extinguish the fire when an electric spark or open flame occurs.

[0083] In the above preferred embodiment, when the internal components of the current limiter have problems such as electric sparks or open flames due to excessive power consumption or excessive heat accumulation, the trigger 8 allows the flame retardant component 7 to quickly extinguish the electric sparks or open flames of the internal components of the current limiter, greatly improving safety.

[0084] It can be understood that the inner frame assembly 2 and the flame retardant assembly 7 are respectively located below and above the annular cover plate 6. This structure makes full use of the space and can achieve both efficient air cooling and rapid fire extinguishing.

[0085] More preferably, Figure 1 、 Figure 4 and Figure 5 As shown, the flame retardant assembly 7 includes a mounting bracket 72 and an airbag 71. The airbag 71 contains a fire extinguishing agent and is mounted on the annular cover plate 6 via the mounting bracket 72. The fire extinguishing agent can be a physical fire extinguishing agent or preferably a chemical fire extinguishing agent, such as heptafluoromethane. The airbag 71 discharges the fire extinguishing agent via a trigger 8.

[0086] The airbag 71 may be one or more. If there are more than one, the heating resistor 83 described below corresponds one to one with the airbag 71; preferably, it is in a ring shape.

[0087] The mounting frame 72 may be one or more, preferably the latter, and more preferably includes an L-shaped fixing plate and fixing ribs. The L-shaped fixing plate is arranged on the outside of the annular airbag 71 for supporting both sides and is fixed by fixing ribs. Figure 4 shown.

[0088] Further preferably, the trigger 8 includes a plurality of heating resistors 83 and a smoke sensor 84. The plurality of heating resistors 83 are spaced apart along the inner circumference of the annular airbag 71 and contact the airbag 71. Upon receiving a smoke signal, the heating resistors 83 are triggered to heat and rupture the corresponding airbag 71, thereby releasing the fire extinguishing agent to extinguish the fire. The plurality of heating resistors 83 preferably have the same specifications.

[0089] More preferably, if Figure 4 As shown, the trigger 8 also includes:

[0090] The mounting tube 81 is fixedly mounted on the annular cover plate 6 and extends in a direction perpendicular to the annular cover plate 6; the smoke sensor 84 is mounted on the mounting tube 81;

[0091] a ring-shaped wire 82, which is mounted around the outside of the mounting tube 81 and is electrically connected to the plurality of heating resistors 83;

[0092] A controller (not shown) is electrically connected to the ring wire 82 and the smoke sensor 84 , and is mounted on the mounting tube 81 .

[0093] In the above preferred scheme, when electric sparks or open flames occur in the internal components of the current limiter due to excessive power consumption or excessive heat accumulation, the smoke sensor 84 detects it and drives the ring wire 82 to be energized through the controller. After being energized, the heating resistor 83 on the ring wire 82 is heated and can quickly melt the airbag at the corresponding position, causing the airbag 71 with a built-in fire extinguishing agent to be damaged, so that the fire extinguishing agent inside the damaged airbag 71 tilts out, quickly extinguishing the electric sparks or open flames of the internal components of the current limiter, avoiding the problem of fire in the current limiter and greatly improving safety.

[0094] In a second aspect, the present invention provides a zero-loss deep current limiter, comprising the heat dissipation device described in the first aspect.

[0095] The zero-loss depth current limiter of the present invention can achieve efficient heat dissipation due to the use of the heat dissipation device, and can promptly and quickly handle the problem of electric sparks or open flames, thereby greatly improving safety and service life.

[0096] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, various simple variations of the technical solution of the present invention may be made, including combining the various technical features in any other appropriate manner. These simple variations and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A heat dissipation device, characterized in that: include: The housing (1) is cylindrical and has a plurality of exhaust holes (3) spaced apart along the circumferential direction thereof, and one end of the housing is open and the other end is closed and provided with a fixing portion for fixing the heat dissipation device; an exhaust fan (4), which is arranged in the housing (1); An inner frame assembly (2) is arranged between the exhaust fan (4) and the inner wall of the housing (1), and is provided with a plurality of air ducts arranged along the outer circumference of the exhaust fan (4), the plurality of air ducts corresponding to the exhaust holes (3), and used for evenly distributing the air blown from the exhaust fan (4) in the circumferential direction to the heat dissipation device outside the exhaust holes (3); A plurality of cooling annular tubes (5) surround the exhaust fan (4) in the outer circumferential direction and are located in a plurality of air ducts, and are arranged at intervals from outside to inside and from top to bottom, for cooling the air in the air ducts to accelerate heat dissipation; The inner frame assembly (2) comprises: An inner sleeve (21) is sleeved outside the exhaust fan (4) and mounted on the housing (1), and is provided with a plurality of diversion holes (22); a plurality of partition plates (23) spaced apart along the outer circumference of the inner sleeve (21), one end of which is connected to the inner sleeve (21) and the other end of which extends to the housing (1); two adjacent partition plates (23) are arranged corresponding to the diversion hole (22) and the exhaust hole (3) to form a plurality of air ducts; The annular tube (5) is fixedly embedded in the partition plate (23) on the inner sleeve (21), and the annular tube (5) is filled with cooling liquid. The annular tubes (5) are distributed in an annular shape with decreasing inner diameters from the outside to the inside, and a certain gap is reserved between adjacent annular tubes (5) in the plurality of annular tubes (5) arranged at intervals in the upper and lower parts of the partition plate (23); The heat dissipation device further comprises: an annular cover plate (6) which is sleeved on the inner frame assembly (2) and covers the plurality of air ducts; a flame retardant assembly (7) mounted on a side of the annular cover plate (6) away from the inner frame assembly (2); A trigger (8) is mounted on the annular cover plate (6) and is disposed close to the exhaust fan (4). The trigger (8) is located inside the flame retardant component (7) and is used to trigger the flame retardant component (7) to extinguish the fire when an electric spark or open flame occurs.

2. The heat dissipation device according to claim 1, characterized in that: A plurality of partition plates (23) are arranged in a fan-shaped manner along the vertical direction of the inner sleeve (21); and / or, the diversion hole (22) and the exhaust hole (3) in the same air duct are located on the vertical axis of the inner sleeve (21); And / or, the diversion hole (22) is extended along the height direction of the inner sleeve (21); And / or, the exhaust hole (3) is plum blossom-shaped and located at the center of the corresponding air duct.

3. The heat dissipation device according to claim 1, wherein: The air outlet of the exhaust fan (4) faces the other end of the housing (1).

4. The heat dissipation device according to claim 1, wherein: The heat dissipation device further comprises: a heat dissipation element (9) which is annularly mounted outside the housing (1) and is correspondingly arranged in the outer circumferential direction of the exhaust hole (3).

5. The heat dissipation device according to claim 4, characterized in that: The heat sink (9) comprises: Two annular mounting plates (91) are vertically fixedly sleeved outside the housing (1) and are respectively located on both sides of the exhaust hole (3); A plurality of heat dissipation fins (92) are installed between two annular mounting plates (91) and are distributed at intervals, and are distributed in an annular shape as a whole.

6. The heat dissipation device according to any one of claims 1 to 5, characterized in that: The flame retardant assembly (7) comprises a mounting frame (72) and an airbag (71), the airbag (71) has a built-in fire extinguishing agent, and the airbag (71) is mounted on the annular cover plate (6) via the mounting frame (72); The trigger (8) comprises a plurality of heating resistors (83) and a smoke sensor (84). The plurality of heating resistors (83) are spaced apart and distributed along the inner circumference of the annular airbag (71) and contact the airbag (71). When a smoke signal is received, the heating resistors (83) are triggered to heat and melt the airbag (71) at a corresponding position, thereby releasing a fire extinguishing agent to extinguish the fire.

7. The heat dissipation device according to claim 6, characterized in that: The trigger (8) further comprises: A mounting tube (81) is fixedly mounted on the annular cover plate (6) and extends in a direction perpendicular to the annular cover plate (6); the smoke sensor (84) is mounted on the mounting tube (81); a ring-shaped wire (82) which is installed around the outside of the installation tube (81) and is electrically connected to the plurality of heating resistors (83); A controller is electrically connected to the ring wire (82) and the smoke sensor (84) respectively, and is mounted on the mounting tube (81).

8. A zero-loss deep current limiter, characterized in that: The heat dissipation device comprises the heat dissipation device according to any one of claims 1 to 7.

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