A switch cabinet with overheat instant power-off protection and its protection method

Abstract

The present invention relates to the technical field of overheat power-off, and specifically to a switch cabinet with instant overheat power-off protection and its protection method, including a cabinet body; and a knife switch rotatably installed on the cabinet body; a static contact fixedly installed on the cabinet body; a temperature sensing mechanism and a heat dissipation mechanism are provided on the cabinet body; the temperature sensing mechanism includes a temperature sensing tank body; a first connecting rod is arranged on the temperature sensing tank body; the heat dissipation mechanism includes a heat dissipation fan; a power-off mechanism is arranged on the knife switch; the power-off mechanism includes a first telescopic column; when the temperature in the cabinet body rises, the temperature sensing mechanism can drive the first connecting rod away from the temperature sensing tank body; and during the process of the first connecting rod moving away, the heat dissipation mechanism will be powered on; the heat dissipation fan will act to accelerate the air circulation in the cabinet body; and when the first connecting rod moves away from the temperature sensing tank body to a set position, the power-off mechanism will drive the first telescopic column to move, so as to drive the knife switch to rotate, thereby driving the knife switch to separate from the static contact; so that the switch cabinet is in a power-off state; to avoid damage to the components in the switch cabinet caused by excessive temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of overheat power-off, and specifically to a switch cabinet with instant overheat power-off protection and its protection method. Background Art

[0002] The switch cabinet plays an important role in distributing electric energy and protecting circuits in the power system. Once faults such as overload, short circuit, and poor contact occur, it will cause overheating of the circuit and equipment, leading to fires. There are many factors affecting the stability of the switch cabinet, such as the quality of internal components, wiring quality, and operating temperature; when the switch cabinet operates in a high-temperature environment for a long time, electrical components are prone to aging, resulting in a decline in the performance and shortening of the lifespan of the switch cabinet, and high temperature will cause a decline in the performance of insulating materials, increasing the risk of short circuit and electric leakage, affecting the safe operation of the equipment. Therefore, when the temperature in the switch cabinet is too high, certain heat dissipation and cooling measures need to be taken, and power should be cut off when the temperature continues to rise to a dangerous value to protect the switch cabinet; a temperature control system is commonly used in the switch cabinet to monitor the temperature.

[0003] Common temperature control systems include temperature sensing components, electromagnetic switch components, etc.; the temperature sensing components continuously monitor the temperature change in the switch cabinet, and when the temperature reaches a dangerous value, a power-off operation is performed through the electromagnetic switch components. Generally speaking, it is relatively reliable and stable; in some specific usage environments (such as high-temperature environments or when the temperature of the switch cabinet changes frequently), when the sensing components work for a long time, signal lag, insensitive induction, etc. will inevitably occur; affecting the accuracy of the power-off operation of the electromagnetic switch components, resulting in damage to the components in the switch cabinet and even huge economic losses and personal injuries. Summary of the Invention

[0004] The purpose of the present invention is to provide a switch cabinet with instant overheat power-off protection and its protection method to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A switch cabinet with instant overheat power-off protection includes a cabinet body; and a knife switch rotatably installed on the cabinet body; a static contact cooperating with the knife switch is fixedly installed on the cabinet body.

[0007] A temperature sensing mechanism and a heat dissipation mechanism are arranged on the cabinet body.

[0008] The temperature sensing mechanism includes a temperature sensing tank body fixedly installed in the cabinet body; a first connecting rod is arranged on the temperature sensing tank body.

[0009] The heat dissipation mechanism includes a cooling fan.

[0010] A power-off mechanism is provided on the knife switch; the power-off mechanism includes a first telescopic column;

[0011] When the temperature in the cabinet rises, the temperature sensing mechanism can drive the first connecting rod away from the temperature sensing tank body; and during the process of the first connecting rod moving away, the heat dissipation mechanism will be powered on; through the operation of the heat dissipation fan, the air circulation in the cabinet can be accelerated;

[0012] And when the first connecting rod moves away from the temperature sensing tank body to a set position, the power-off mechanism will drive the first telescopic column to move, so as to drive the knife switch to rotate, thereby driving the knife switch to separate from the static contact.

[0013] As a further scheme of the present invention: the temperature sensing mechanism further includes a piston slidably fitted in the temperature sensing tank body; a guide rod fixedly installed on the piston and fixedly connected to the first connecting rod; a rotating connecting rod rotatably installed on the cabinet body; a first hinge block rotatably installed on the rotating connecting rod and hinged to the first connecting rod. The temperature sensing mechanism further includes a piston slidably fitted in the temperature sensing tank body; a guide rod fixedly installed on the piston and fixedly connected to the first connecting rod; a rotating connecting rod rotatably installed on the cabinet body; a first hinge block rotatably installed on the rotating connecting rod and hinged to the first connecting rod.

[0014] As a further scheme of the present invention: a connecting plate is fixedly installed on the first connecting rod; a sliding rod is slidably installed on the connecting plate; a moving contact is fixedly installed on the sliding rod; a buffer spring is wound around the sliding rod; both ends of the buffer spring are in contact with the moving contact and the connecting plate respectively; a static contact cooperating with the moving contact is fixedly installed on the cabinet body.

[0015] As a further scheme of the present invention: a plurality of heat dissipation channels are opened on the cabinet body; the heat dissipation mechanism further includes a sealing disc rotatably installed on the cabinet body and cooperating with the heat dissipation channels; a rotating sleeve is fixedly installed on the sealing disc, and a protruding column is fixedly installed in the rotating sleeve; a fixed shaft is fixedly installed on the cabinet body, and a second sliding groove is opened on the fixed shaft; a sliding sleeve is arranged on the fixed shaft; a protrusion slidably fitted with the second sliding groove is fixedly installed on the sliding sleeve; an inclined groove slidably fitted with the protruding column is opened on the sliding sleeve; a return spring is wound around the fixed shaft; both ends of the return spring are in contact with the cabinet body and the sliding sleeve respectively.

[0016] As a further solution of the present invention: The heat dissipation mechanism further includes a motor, and a main rotating shaft fixedly connected to the heat dissipation fan is fixedly installed on the output end of the motor; A turntable is fixedly installed on the main rotating shaft; A counterweight block is slidably fitted on the turntable; A second telescopic column is fixedly installed on the counterweight block; A pressing sleeve is slidably installed on the main rotating shaft; A second telescopic sleeve fixedly connected to the second telescopic column is fixedly installed on the pressing sleeve.

[0017] As a further solution of the present invention: The power-off mechanism further includes a first telescopic sleeve fixedly installed on the cabinet body, and the first telescopic sleeve is slidably fitted with the first telescopic column; A second hinge block hinged to the knife switch is rotatably installed on the first telescopic column; A power-off spring is wound around the first telescopic column; Both ends of the power-off spring respectively abut against the first telescopic column and the first telescopic sleeve; A limiting chute is opened on the first telescopic column; A limiting block is slidably fitted in the limiting chute; A limiting spring is arranged in the limiting chute; Both ends of the limiting spring respectively abut against the first telescopic column and the limiting block; A limiting groove matched with the limiting block is opened on the first telescopic sleeve.

[0018] As a further solution of the present invention: A heat conducting rod with a relatively large heat conductivity coefficient is fixedly installed on the temperature sensing tank body.

[0019] As a further solution of the present invention: The temperature sensing tank body is in a frustum shape; And the diameter of the surface matched with the piston is smaller.

[0020] As a further solution of the present invention: The rotating directions of the heat dissipation fans arranged on both sides of the cabinet body are opposite.

[0021] A protection method for a switch cabinet with overheat instant power-off protection as described above when the temperature inside the switch cabinet rises, including the following steps:

[0022] The first step: The temperature sensing tank body continuously monitors the temperature change inside the cabinet body, and according to the temperature change inside the cabinet body, the position of the first connecting rod is changed in real time;

[0023] The second step: As the temperature inside the cabinet body rises, the first connecting rod gradually moves away from the temperature sensing tank body. When the first connecting rod moves to the set position, the moving contact touches the static contact, and the heat dissipation mechanism is electrified; The cabinet body is cooled by the heat dissipation mechanism.

[0024] The third step; The heat dissipation mechanism continuously cools the cabinet body; To slow down the temperature rising rate inside the switch cabinet;

[0025] Step 4: When the temperature inside the cabinet rises and the first connecting rod moves to another set position, the power-off mechanism will actuate; the power-off mechanism drives the knife switch to rotate, so that the knife switch separates from the static contact; making the entire cabinet in a power-off state to protect the switch cabinet from damage caused by high temperature.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: The temperature change inside the switch cabinet is monitored in real time through the temperature sensing mechanism, and the position of the first connecting rod is changed in real time according to the temperature change inside the switch cabinet; and during the process of the position change of the first connecting rod, by changing the power-on state of the heat dissipation mechanism, the switch cabinet is cooled by the heat dissipation mechanism to reduce the rate of temperature rise of the switch cabinet; and when the temperature inside the switch cabinet reaches the set value, the power-off mechanism is driven to actuate to drive the knife switch to separate from the static contact, so that the switch cabinet is in a power-off state; to avoid damage to the components inside the switch cabinet caused by too high temperature, and then avoid the occurrence of safety accidents; and the temperature sensing mechanism controls the actions of the heat dissipation mechanism and the power-off mechanism by the heat absorption collision of the heat conduction medium, and the heat absorption expansion coefficient of the heat conduction medium is relatively stable, so the temperature can be monitored more accurately, and it can effectively avoid the situation of power-off delay or non-power-off of the switch cabinet due to overheating; effectively improving the safety of the switch cabinet. Description of the Drawings

[0027] Figure 1 Structural schematic diagram of an embodiment of a switch cabinet with overheat instant power-off protection and its protection method.

[0028] Figure 2 Structural schematic diagram of the temperature sensing tank body in an embodiment of a switch cabinet with overheat instant power-off protection and its protection method.

[0029] Figure 3 For Figure 2 Structural schematic diagram at position A in

[0030] Figure 4 Structural schematic diagram of the power-off mechanism in an embodiment of a switch cabinet with overheat instant power-off protection and its protection method.

[0031] Figure 5 For Figure 4 Structural schematic diagram from another perspective of

[0032] Figure 6 For Figure 4 Structural schematic diagram in the sectional view of

[0033] Figure 7 For Figure 6 Structural schematic diagram at position B in

[0034] Figure 8 Structural schematic diagram of the first connecting rod in an embodiment of a switch cabinet with overheat instant power-off protection and its protection method.

[0035] Figure 9 Structural schematic diagram of the heat dissipation mechanism in an embodiment of a switch cabinet with instant power-off protection against overheating and its protection method.

[0036] Figure 10 For Figure 9 Structural schematic diagram at position C in

[0037] Figure 11 Structural schematic diagram of the rotating sleeve and the sliding sleeve in an embodiment of a switch cabinet with instant power-off protection against overheating and its protection method.

[0038] In the figure: 1. Cabinet body; 101. Heat dissipation channel;

[0039] 2. Static contact;

[0040] 3. Knife switch;

[0041] 4. Temperature-sensitive tank body; 401. Heat conduction rod;

[0042] 5. Piston; 501. Guide rod;

[0043] 6. First connecting rod; 601. Connecting plate;

[0044] 7. First hinge block;

[0045] 8. Rotating connecting rod;

[0046] 9. Second hinge block;

[0047] 10. First telescopic column; 1001. Limit sliding groove;

[0048] 11. First telescopic sleeve; 1101. Limit groove;

[0049] 12. Power-off spring;

[0050] 13. Limit spring;

[0051] 14. Limit block;

[0052] 15. Slide bar; 1501. Moving contact;

[0053] 16. Static contact;

[0054] 17. Buffer spring;

[0055] 18. Cooling fan;

[0056] 19. Motor;

[0057] 20. Main rotating shaft;

[0058] 21. Turntable;

[0059] 22. Counterweight; 2201. Second telescopic column;

[0060] 23. Extrusion sleeve; 2301. Second telescopic sleeve;

[0061] 24. Fixed shaft; 2401. Second chute;

[0062] 25. Sliding sleeve; 2501. Protrusion; 2502. Tilted groove;

[0063] 26. Rotating sleeve; 2601. Protruding column;

[0064] 27. Sealing disc;

[0065] 28. Return spring. Detailed implementation manners

[0066] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0067] In addition, an element in the present invention is referred to as being "fixed to" or "disposed on" another element, and it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manners.

[0068] Please refer to Figures 1 to 11 , in the embodiment of the present invention, a switch cabinet with overheat instant power-off protection includes a cabinet body 1; and a knife switch 3 rotatably installed on the cabinet body 1; a static contact 2 cooperated with the knife switch 3 is fixedly installed on the cabinet body 1;

[0069] A temperature sensing mechanism and a heat dissipation mechanism are provided on the cabinet body 1;

[0070] The temperature sensing mechanism includes a temperature sensing tank body 4 fixedly installed in the cabinet body 1; a first connecting rod 6 is provided on the temperature sensing tank body 4;

[0071] The heat dissipation mechanism includes a heat dissipation fan 18;

[0072] A power-off mechanism is provided on the knife switch 3; the power-off mechanism includes a first telescopic column 10;

[0073] The temperature sensing mechanism can drive the first connecting rod 6 away from the temperature sensing tank 4 when the temperature in the cabinet 1 rises; and when the first connecting rod 6 moves away, the heat dissipation mechanism will be energized; the heat dissipation fan 18 will be activated to speed up the air circulation in the cabinet 1;

[0074] When the first connecting rod 6 moves away from the temperature sensing tank 4 to a set position, the power-off mechanism drives the first telescopic column 10 to move, so as to drive the switch blade 3 to rotate, thereby driving the switch blade 3 to separate from the static contact 2 .

[0075] Taking the embodiment of all the features recorded in this application as an example, when the static contact 2 and the knife 3 are in contact, the switch cabinet is in a powered-on state; and when the static contact 2 and the knife 3 are separated, the switch cabinet is in a powered-off state. Since the components in the switch cabinet have certain use conditions (they can work normally within a certain temperature range, and the working state is unstable when the temperature is too high), when the components are powered on in an unstable state, they are easily damaged and even cause safety accidents.

[0076] When in use, the operator rotates the switch blade 3 by means of a tool so that the switch blade 3 contacts the static contact 2 to energize the switch cabinet. The temperature inside the cabinet 1 will change due to the change in ambient temperature and the influence of the components inside the switch cabinet, and the temperature sensing tank 4 will monitor and sense the temperature change inside the cabinet 1 in real time.

[0077] When the temperature in the cabinet 1 rises, the temperature-sensing tank 4 will drive the first connecting rod 6 to move away from the temperature-sensing tank 4 ; as the temperature in the cabinet 1 continues to rise, the moving distance of the first connecting rod 6 will also continue to increase.

[0078] When the first connecting rod 6 moves to the set position, the temperature in the cabinet 1 reaches the warning value. At this time, the heat dissipation mechanism will be energized, and the heat dissipation fan 18 will be activated to accelerate the air circulation in the cabinet 1, thereby dissipating heat and cooling the cabinet 1 to prevent the temperature in the cabinet 1 from continuing to rise.

[0079] After the heat dissipation mechanism is activated, the temperature in the cabinet 1 continues to rise, and the first connecting rod 6 continues to move away from the temperature sensing tank 4; during this process, the heat dissipation mechanism will continue to dissipate heat and cool the cabinet 1 to reduce the rate of temperature rise in the cabinet 1.

[0080] When the temperature in the cabinet 1 reaches the set dangerous value, the temperature sensing mechanism will drive the power-off mechanism to operate, and drive the first telescopic column 10 to move, thereby driving the knife 3 to rotate, so that the knife 3 is separated from the static contact 2, so that the switch cabinet is in a power-off state; to avoid excessive temperature from damaging the components in the switch cabinet, and then avoid the occurrence of safety accidents.

[0081] The temperature change inside the switch cabinet is monitored in real time through the temperature sensing mechanism, and the position of the first connecting rod 6 is changed in real time according to the temperature change inside the switch cabinet. During the process of the change of the position of the first connecting rod 6, the power-on state of the heat dissipation mechanism is changed to dissipate heat from the switch cabinet through the heat dissipation mechanism, so as to reduce the rate of temperature rise of the switch cabinet. When the temperature inside the switch cabinet reaches the set value, the power-off mechanism is driven to act to drive the knife switch 3 to separate from the static contact 2, so that the switch cabinet is in a power-off state, so as to avoid damage to the components inside the switch cabinet caused by excessive temperature and then avoid the occurrence of safety accidents.

[0082] In another embodiment of the present invention, the temperature sensing mechanism further includes a piston 5 slidably fitted in the temperature sensing tank body 4; a guide rod 501 fixedly installed on the piston 5 and fixedly connected to the first connecting rod 6; a rotating connecting rod 8 is rotatably installed on the cabinet body 1; a first hinge block 7 hinged to the first connecting rod 6 is rotatably installed on the rotating connecting rod 8.

[0083] Taking the embodiment combined with all the features described in this application as an example, when in use, the temperature sensing tank body 4 is filled with a heat-conducting medium, and the heat-conducting medium expands when it absorbs heat.

[0084] When the temperature inside the cabinet body 1 rises, the heat-conducting medium expands, and its volume will increase; during the process of the increase of the volume of the heat-conducting medium, the piston 5 will be pushed to slide outwards in the temperature sensing tank body 4, so as to drive the first connecting rod 6 to gradually move away from the temperature sensing tank body 4 through the guide rod 501.

[0085] During the movement of the first connecting rod 6, the rotating connecting rod 8 will be driven to rotate and approach the first telescopic column 10, and the included angles between the first connecting rod 6 and the first hinge block 7 and between the first hinge block 7 and the rotating connecting rod 8 will both change.

[0086] The temperature change inside the switch cabinet is monitored in real time through the temperature sensing mechanism, and the position of the first connecting rod 6 is changed in real time according to the temperature change inside the switch cabinet. During the process of the change of the position of the first connecting rod 6, the power-on state of the heat dissipation mechanism is changed to dissipate heat from the switch cabinet through the heat dissipation mechanism, so as to reduce the rate of temperature rise of the switch cabinet. When the temperature inside the switch cabinet reaches the set value, the power-off mechanism is driven to act to drive the knife switch 3 to separate from the static contact 2, so that the switch cabinet is in a power-off state, so as to avoid damage to the components inside the switch cabinet caused by excessive temperature and then avoid the occurrence of safety accidents.

[0087] In another embodiment of the present invention, a connecting plate 601 is fixedly installed on the first connecting rod 6; a sliding rod 15 is slidably installed on the connecting plate 601; a moving contact 1501 is fixedly installed on the sliding rod 15; a buffer spring 17 is wound around the sliding rod 15; both ends of the buffer spring 17 are in contact with the moving contact 1501 and the connecting plate 601 respectively; a static contact 16 cooperating with the moving contact 1501 is fixedly installed on the cabinet body 1.

[0088] Taking the embodiment combining all the features described in this application as an example, when in use, during the process of the first connecting rod 6 moving away from the temperature-sensitive tank body 4, it will drive the connecting plate 601 to move synchronously, and drive the sliding rod 15 to approach the static contact 16 through the buffer spring 17; so as to drive the moving contact 1501 to approach the static contact 16.

[0089] When the temperature inside the cabinet body 1 reaches the set warning value, the moving contact 1501 contacts the static contact 16; at this time, the switch cabinet can supply power to the heat dissipation mechanism, so as to cool down the switch cabinet through the heat dissipation mechanism.

[0090] When the temperature inside the switch cabinet still continues to rise after the heat dissipation mechanism operates, the first connecting rod 6 will continue to move. At this time, the connecting plate 601 will compress the buffer spring 17, and the static contact 16 and the moving contact 1501 still remain in contact; at this time, the heat dissipation mechanism will continue to operate to reduce the rising rate of the temperature inside the switch cabinet.

[0091] In another embodiment of the present invention, a plurality of heat dissipation channels 101 are opened on the cabinet body 1; the heat dissipation mechanism further includes a sealing disk 27 rotatably installed on the cabinet body 1 and cooperating with the heat dissipation channels 101; a rotating sleeve 26 is fixedly installed on the sealing disk 27, and a protruding column 2601 is fixedly installed inside the rotating sleeve 26; a fixed shaft 24 is fixedly installed on the cabinet body 1, and a second sliding groove 2401 is opened on the fixed shaft 24; a sliding sleeve 25 is arranged on the fixed shaft 24; a protrusion 2501 slidably engaged with the second sliding groove 2401 is fixedly installed on the sliding sleeve 25; an inclined groove 2502 slidably engaged with the protruding column 2601 is opened on the sliding sleeve 25; a return spring 28 is wound around the fixed shaft 24; both ends of the return spring 28 are in contact with the cabinet body 1 and the sliding sleeve 25 respectively.

[0092] Taking the embodiment combining all the features described in this application as an example, when in use, in the initial state, the sealing disk 27 cooperates with the heat dissipation channels 101 to block the air circulation between the switch cabinet and the outside world, and can effectively prevent external dust and moisture from entering the switch cabinet.

[0093] When the heat dissipation mechanism is powered on, the motor 19 will operate, thereby driving the main rotating shaft 20 to rotate, and driving the heat dissipation fan 18 to rotate accordingly to accelerate the air circulation inside the switch cabinet.

[0094] When the main rotating shaft 20 rotates, it will drive the sliding sleeve 25 to slide on the fixed shaft 24 in the direction of the heat dissipation channel 101. At this time, the protrusion 2501 will slide in the second chute 2401 and compress the return spring 28; when the sliding sleeve 25 slides, it will drive the protruding column 2601 to slide in the inclined groove 2502, and through the extrusion between the inclined groove 2502 and the protruding column 2601, drive the rotating sleeve 26 to rotate, thereby driving the sealing disc 27 to rotate on the cabinet body 1; when the protruding column 2601 slides from one end of the inclined groove 2502 to the other end, the sealing disc 27 rotates to the maximum stroke position. At this time, the heat dissipation channel 101 is opened; the air inside and outside the cabinet body 1 can circulate; the switch cabinet is cooled by the heat dissipation mechanism to reduce the rate of temperature rise of the switch cabinet.

[0095] When the heat dissipation fan 18 stops rotating, the elastic force of the return spring 28 can drive the sliding sleeve 25 to move away from the heat dissipation channel 101 on the fixed shaft 24, thereby driving the protruding column 2601 to slide reversely in the inclined groove 2502, and then driving the sealing disc 27 to rotate reversely and reset to close the heat dissipation channel 101.

[0096] In another embodiment of the present invention, the heat dissipation mechanism further includes a motor 19, and a main rotating shaft 20 fixedly connected to the heat dissipation fan 18 is fixedly installed on the output end of the motor 19; a turntable 21 is fixedly installed on the main rotating shaft 20; a counterweight 22 is slidably fitted on the turntable 21; a second telescopic column 2201 is fixedly installed on the counterweight 22; an extrusion sleeve 23 is slidably installed on the main rotating shaft 20; and a second telescopic sleeve 2301 slidably connected to the second telescopic column 2201 is fixedly installed on the extrusion sleeve 23.

[0097] Taking the embodiment combined with all the features described in this application as an example, when in use, when the main rotating shaft 20 rotates, it will drive the turntable 21 to rotate, thereby driving the counterweight 22 to rotate synchronously. Under the action of centrifugal force, the counterweight 22 will slide on the turntable 21 in the direction away from the main rotating shaft 20.

[0098] During the sliding process of the counterweight 22, it will drive the second telescopic column 2201 to slide outwards in the second telescopic sleeve 2301, thereby driving the extrusion sleeve 23 to slide towards the sliding sleeve 25, so as to drive the sliding sleeve 25 to slide synchronously in the direction of the heat dissipation channel 101, thereby driving the sealing disc 27 to rotate to conduct the heat dissipation channel 101, thus accelerating the air flow inside and outside the switch cabinet.

[0099] When the main rotating shaft 20 stops rotating, the elastic force of the reset spring 28 will squeeze the sliding sleeve 25 to drive the extrusion sleeve 23 to reset synchronously; during the reset process, the second telescopic column 2201 will slide inward in the second telescopic sleeve 2301 to drive the counterweight 22 to approach the main rotating shaft 20 to complete the reset.

[0100] The switch cabinet is cooled by a heat dissipation mechanism to reduce the rate of temperature rise of the switch cabinet.

[0101] In another embodiment of the present invention, the power-off mechanism further includes a first telescopic sleeve 11 fixedly installed on the cabinet body 1, and the first telescopic sleeve 11 is slidably fitted with the first telescopic column 10; a second hinge block 9 hinged to the knife switch 3 is rotatably installed on the first telescopic column 10; a power-off spring 12 is wound around the first telescopic column 10; both ends of the power-off spring 12 are in contact with the first telescopic column 10 and the first telescopic sleeve 11 respectively; a limit chute 1001 is provided on the first telescopic column 10; a limit block 14 is slidably fitted in the limit chute 1001; a limit spring 13 is provided in the limit chute 1001; both ends of the limit spring 13 are in contact with the first telescopic column 10 and the limit block 14 respectively; a limit groove 1101 cooperating with the limit block 14 is provided on the first telescopic sleeve 11.

[0102] Taking the embodiment combined with all the features described in this application as an example, when in use, during the process of applying an external force to make the knife switch 3 contact the static contact 2, the knife switch 3 will drive the first telescopic column 10 to approach the knife switch 3 direction in the first telescopic sleeve 11 through the second hinge block 9; during the approaching process, the limit block 14 will be in contact with and slidably cooperate with the inner wall of the first telescopic sleeve 11 under the elastic force of the limit spring 13; at the same time, the power-off spring 12 will be compressed; when the knife switch 3 contacts the static contact 2, the limit block 14 will separate from the inner wall of the first telescopic sleeve 11 and slide outward in the limit chute 1001 under the elastic force of the limit spring 13 to enter the limit groove 1101, and through the contact action between the limit groove 1101 and the limit block 14, to prevent the knife switch 3 from separating from the static contact 2; it can effectively avoid the influence of external interferences such as vibration, shaking and collision on the switch cabinet (prevent the situation that the static contact 2 and the knife switch 3 are automatically separated due to external interference, resulting in power-off of the switch cabinet), and effectively improve the stability of the switch cabinet.

[0103] When the temperature inside the switch cabinet is about to rise to the set dangerous value, the temperature sensing mechanism will drive the first connecting rod 6 to move, so as to drive the rotating connecting rod 8 to rotate. At this time, the rotating connecting rod 8 just touches the limiting block 14; as the temperature continues to rise, the first connecting rod 6 continues to move, thus driving the rotating connecting rod 8 to continue to rotate. At this time, the rotating connecting rod 8 will squeeze the limiting block 14, so that the limiting block 14 slides inwards in the limiting chute 1001 to compress the limiting spring 13; when the limiting block 14 moves to disengage from the limiting groove 1101, the elastic force of the power-off spring 12 will drive the first telescopic column 10 to slide in the first telescopic sleeve 11 in the direction away from the knife switch 3; during the sliding process of the first telescopic column 10, it will drive the knife switch 3 to rotate through the second hinge block 9; at this time, the included angles between the second hinge block 9, the first telescopic column 10 and the knife switch 3 will change; when the knife switch 3 rotates, it will move away from the static contact 2, so that the knife switch 3 and the static contact 2 are separated, thereby powering off the switch cabinet to prevent the components inside the switch cabinet from working at too high a temperature, so as to avoid damage to the switch cabinet and even avoid the occurrence of safety accidents.

[0104] In another embodiment of the present invention, a heat conducting rod 401 with a relatively large heat conductivity is fixedly installed on the temperature sensing tank body 4.

[0105] Taking the embodiment combined with all the features described in this application as an example, during use, the heat conducting rod 401 can effectively improve the perception of the temperature change inside the switch cabinet by the temperature sensing tank body 4, and avoid damage to the switch cabinet caused by the lag of the temperature sensing tank body 4 monitoring.

[0106] In another embodiment of the present invention, the temperature sensing tank body 4 is in a frustum shape; and the diameter of the surface cooperating with the piston 5 is smaller.

[0107] Taking the embodiment combined with all the features described in this application as an example, during use, when the heat conducting medium in the temperature sensing tank body 4 absorbs heat and expands by spraying, its volume will become larger. Since the diameter cooperating with the piston 5 is smaller, the extrusion force on the piston 5 becomes larger, so that the piston 5 can overcome the elastic force of the buffer spring 17 and the sliding resistance of the limiting block 14, so as to drive the rotating connecting rod 8 to rotate through the first connecting rod 6 to drive the limiting block 14 to slide inwards in the limiting chute 1001.

[0108] In another embodiment of the present invention, the rotating directions of the heat dissipation fans 18 arranged on both sides of the cabinet body 1 are opposite.

[0109] Taking the embodiment combined with all the features described in this application as an example, during use, one side of the heat dissipation fan 18 can suck the air with a lower temperature outside the switch cabinet into the switch cabinet through the heat dissipation channel 101; the heat dissipation fan 18 on the other side can blow the air with a higher temperature inside the switch cabinet to the outside through the heat dissipation channel 101; thereby reducing the rate of temperature rise inside the switch cabinet.

[0110] A protection method for a switch cabinet with overheat instant power-off protection as described above, when the temperature inside the switch cabinet rises, includes the following steps:

[0111] First step: The temperature sensing tank body 4 continuously monitors the temperature change inside the cabinet body 1, and according to the temperature change inside the cabinet body 1, the position of the first connecting rod 6 is changed in real time;

[0112] Second step: As the temperature inside the cabinet body 1 rises, the first connecting rod 6 gradually moves away from the temperature sensing tank body 4. When the first connecting rod 6 moves to the set position, the moving contact 1501 contacts the static contact 16, and the heat dissipation mechanism is powered on; the cabinet body 1 is cooled by the heat dissipation mechanism;

[0113] Third step; The heat dissipation mechanism continuously cools the cabinet body 1; to slow down the temperature rising rate inside the switch cabinet;

[0114] Fourth step: As the temperature inside the cabinet body 1 rises, when the first connecting rod 6 moves to another set position, the power-off mechanism will act; the knife switch 3 is driven to rotate by the power-off mechanism, so that the knife switch 3 is separated from the static contact 2; the whole cabinet body 1 is in a power-off state to protect the switch cabinet from high temperature damage.

[0115] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0116] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A switch cabinet with overheat instant power-off protection, comprising a cabinet body; and a knife switch rotatably mounted on the cabinet body; a static contact cooperating with the knife switch is fixedly mounted on the cabinet body; It is characterized in that A temperature sensing mechanism and a heat dissipation mechanism are arranged on the cabinet body; The temperature sensing mechanism includes a temperature sensing tank fixedly mounted in the cabinet body; a first connecting rod is arranged on the temperature sensing tank; The heat dissipation mechanism includes a heat dissipation fan; A power-off mechanism is arranged on the knife switch; the power-off mechanism includes a first telescopic column; When the temperature in the cabinet body rises, the temperature sensing mechanism can drive the first connecting rod away from the temperature sensing tank; and during the process of the first connecting rod moving away, the heat dissipation mechanism will be powered on; through the action of the heat dissipation fan, the air circulation in the cabinet body is accelerated; And when the first connecting rod moves away from the temperature sensing tank to a set position, the power-off mechanism will drive the first telescopic column to move, so as to drive the knife switch to rotate, thereby driving the knife switch to separate from the static contact; The temperature sensing mechanism further includes a piston slidably fitted in the temperature sensing tank; a guide rod fixedly connected to the first connecting rod is fixedly mounted on the piston; a rotating connecting rod is rotatably mounted on the cabinet body; a first hinge block hinged to the first connecting rod is rotatably mounted on the rotating connecting rod; The power-off mechanism further includes a first telescopic sleeve fixedly mounted on the cabinet body, and the first telescopic sleeve is slidably fitted with the first telescopic column; a second hinge block hinged to the knife switch is rotatably mounted on the first telescopic column; a power-off spring is wound around the first telescopic column; two ends of the power-off spring respectively abut against the first telescopic column and the first telescopic sleeve; a limiting chute is opened on the first telescopic column; a limiting block is slidably fitted in the limiting chute; a limiting spring is arranged in the limiting chute; two ends of the limiting spring respectively abut against the first telescopic column and the limiting block; a limiting groove cooperating with the limiting block is opened on the first telescopic sleeve.

2. The switch cabinet with overheat instant power-off protection according to claim 1, characterized in that, A connecting plate is fixedly mounted on the first connecting rod; a sliding rod is slidably mounted on the connecting plate; a moving contact is fixedly mounted on the sliding rod; a buffer spring is wound around the sliding rod; two ends of the buffer spring respectively abut against the moving contact and the connecting plate; a static contact cooperating with the moving contact is fixedly mounted on the cabinet body.

3. The switch cabinet with overheat instant power-off protection according to claim 1, characterized in that, Multiple groups of heat dissipation channels are opened on the cabinet body; the heat dissipation mechanism further includes a sealing disc rotatably mounted on the cabinet body and cooperating with the heat dissipation channels; a rotating sleeve is fixedly mounted on the sealing disc, and a protruding column is fixedly mounted in the rotating sleeve; a fixed shaft is fixedly mounted on the cabinet body, and a second chute is opened on the fixed shaft; a sliding sleeve is arranged on the fixed shaft; a protrusion slidably fitted with the second chute is fixedly mounted on the sliding sleeve; an inclined groove slidably fitted with the protruding column is opened on the sliding sleeve; a return spring is wound around the fixed shaft; two ends of the return spring respectively abut against the cabinet body and the sliding sleeve.

4. The switch cabinet with overheat instant power-off protection according to claim 3, characterized in that, The heat dissipation mechanism further includes a motor, a main rotating shaft fixedly connected to the heat dissipation fan is fixedly mounted on the output end of the motor; a turntable is fixedly mounted on the main rotating shaft; a counterweight block is slidably fitted on the turntable; a second telescopic column is fixedly mounted on the counterweight block; a pressing sleeve is slidably mounted on the main rotating shaft; a second telescopic sleeve slidably connected to the second telescopic column is fixedly mounted on the pressing sleeve.

5. The switch cabinet with overheat instant power-off protection according to claim 1, characterized in that, A heat conduction rod with a relatively large heat conduction coefficient is fixedly installed on the temperature-sensitive tank body.

6. The switch cabinet with overheat instant power-off protection according to claim 1, characterized in that, The temperature-sensitive tank body is frustum-shaped; and the diameter of the surface that cooperates with the piston is smaller.

7. An switchgear cabinet with overheat instant power-off protection according to claim 1, characterized in that, The rotation directions of the heat dissipation fans arranged on both sides of the cabinet body are opposite.

8. A protection method for a switchgear cabinet with overheat instant power-off protection as described in any one of claims 1-7, when the temperature inside the switchgear cabinet rises, characterized in that, It includes the following steps: The first step: The temperature-sensitive tank body continuously monitors the temperature change in the cabinet body, and according to the temperature change in the cabinet body, the position of the first connecting rod is changed in real time. The second step: As the temperature in the cabinet body rises, the first connecting rod gradually moves away from the temperature-sensitive tank body. When the first connecting rod moves to the set position, the moving contact touches the static contact, and the heat dissipation mechanism is powered on; the cabinet body is cooled by the heat dissipation mechanism. The third step: The heat dissipation mechanism continuously cools the cabinet body to slow down the temperature rise rate in the switch cabinet. The fourth step: As the temperature in the cabinet body rises, when the first connecting rod moves to another set position, the power-off mechanism will act; the power-off mechanism drives the knife switch to rotate, so that the knife switch is separated from the static contact; the whole cabinet body is in a power-off state to protect the switch cabinet from high-temperature damage.

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