Switch cabinet with instant power-off protection in case of overheating and protection method thereof

Abstract

The invention relates to the technical field of overheating power-off, in particular to a switch cabinet with overheating instant power-off protection and a protection method of the switch cabinet. The switch blade is rotationally arranged on the cabinet body; a static contact is fixedly arranged on the cabinet body; a temperature sensing mechanism and a heat dissipation mechanism are arranged on the cabinet body; the temperature sensing mechanism comprises a temperature sensing tank body; a first connecting rod is arranged on the temperature sensing tank body; the heat dissipation mechanism comprises a heat dissipation fan; a power-off mechanism is arranged on the knife switch; the power-off mechanism comprises a first telescopic column; the temperature sensing mechanism can drive the first connecting rod to be away from the temperature sensing tank body when the temperature in the cabinet body rises; in the process that the first connecting rod gets away, the heat dissipation mechanism is powered on; through the action of the cooling fan, the air circulation in the cabinet body is accelerated; when the first connecting rod is far away from the temperature sensing tank body to a set position, the power-off mechanism drives the first telescopic column to move so as to drive the knife switch to rotate, so that the knife switch is driven to be separated from the static contact; the switch cabinet is in a power-off state; therefore, components in the switch cabinet are prevented from being damaged due to over-high temperature.

Description

Technical Field

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

[0002] Switchgear plays an important role in distributing electrical energy and protecting circuits in power systems. Once faults such as overload, short circuit, and poor contact occur, the circuit and equipment will overheat and cause a fire. There are many factors that affect the stability of the switchgear, such as the quality of internal components, wiring quality, and operating temperature. When the switchgear is operated in a high temperature environment for a long time, the electrical components are prone to aging, resulting in a decrease in the performance and shortened life of the switchgear. High temperature will cause the performance of the insulation material to decrease, increase the risk of short circuit and leakage, and affect the safe operation of the equipment. Therefore, when the temperature in the switchgear is too high, certain heat dissipation and cooling measures are required, and when the temperature continues to rise to a dangerous value, the power must be cut off to protect the switchgear. Temperature control systems are often used to monitor the temperature in common switchgear.

[0003] Common temperature control systems include temperature sensing components, electromagnetic switch assemblies, etc.; temperature sensing components monitor temperature changes in the switch cabinet in real time, and when the temperature reaches a dangerous value, the electromagnetic switch assembly performs a power-off operation. Generally speaking, they are more reliable and stable; when in certain specific usage environments (such as high temperature environments or frequent temperature changes in the switch cabinet), the sensing components will work for a long time, and signal delays and insensitivity will inevitably occur; affecting the accuracy of the electromagnetic switch assembly's power-off operation, causing damage to components in the switch cabinet and even huge economic losses and personal injury. ‌‌‌ Summary of the invention

[0004] The object of the present invention is to provide a switch cabinet with instant overheating power-off protection and a protection method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A switch cabinet with instant overheating power-off protection, comprising a cabinet body; and a switch knife rotatably mounted on the cabinet body; and a static contact matched with the switch knife fixedly mounted on the cabinet body; The cabinet is provided with a temperature sensing mechanism and a heat dissipation mechanism; The temperature sensing mechanism comprises a temperature sensing tank body fixedly installed in the cabinet; a first connecting rod is arranged on the temperature sensing tank body; The heat dissipation mechanism includes a heat dissipation fan; The switch blade is provided with a power-off mechanism; the power-off mechanism comprises a first telescopic column; The temperature sensing mechanism can drive the first connecting rod away from the temperature sensing tank when the temperature inside the cabinet increases; and during the process of the first connecting rod moving away, the heat dissipation mechanism will be energized; and the heat dissipation fan will be activated to accelerate the air circulation inside the cabinet; When the first connecting rod moves away from the temperature sensing tank to a set position, the power-off mechanism drives the first telescopic column to move, so as to drive the switch blade to rotate, thereby driving the switch blade to separate from the static contact.

[0006] As a further solution of the present invention: the temperature sensing mechanism also includes a piston slidably embedded in the temperature sensing tank body; a guide rod fixedly connected to the first connecting rod is fixedly installed on the piston; a rotating connecting rod is rotatably installed on the cabinet body; a first hinge block hinged to the first connecting rod is rotatably installed on the rotating connecting rod. The temperature sensing mechanism also includes a piston slidably embedded in the temperature sensing tank body; a guide rod fixedly connected to the first connecting rod is fixedly installed on the piston; a rotating connecting rod is rotatably installed on the cabinet body; a first hinge block hinged to the first connecting rod is rotatably installed on the rotating connecting rod.

[0007] As a further solution 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 wrapped around the sliding rod; two ends of the buffer spring respectively contact with the moving contact and the connecting plate; a static contact cooperating with the moving contact is fixedly installed on the cabinet body.

[0008] As a further solution of the present invention: the cabinet is provided with multiple groups of heat dissipation channels; the heat dissipation mechanism also includes a sealing disk rotatably mounted on the cabinet and cooperating with the heat dissipation channels; a rotating sleeve is fixedly mounted on the sealing disk, and a protruding column is fixedly mounted inside the rotating sleeve; a fixed shaft is fixedly mounted on the cabinet, and a second sliding groove is provided on the fixed shaft; a sliding sleeve is provided on the fixed shaft; a protrusion slidably engaged with the second sliding groove is fixedly mounted on the sliding sleeve; an inclined groove slidably engaged with the protruding column is provided on the sliding sleeve; a reset spring is wrapped around the fixed shaft; and the two ends of the reset spring respectively contact the cabinet and the sliding sleeve.

[0009] As a further solution of the present invention: the heat dissipation mechanism also includes a motor, and a main rotating shaft fixedly connected to the cooling 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 engaged on the turntable; a second telescopic column is fixedly mounted on the counterweight block; an extrusion 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 extrusion sleeve.

[0010] As a further solution of the present invention: the power-off mechanism also includes a first telescopic sleeve fixedly mounted on the cabinet, and the first telescopic sleeve is slidably engaged 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 wrapped around the first telescopic column; the two ends of the power-off spring respectively conflict with the first telescopic column and the first telescopic sleeve; a limiting groove is provided on the first telescopic column; a limiting block is slidably engaged in the limiting groove; a limiting spring is arranged in the limiting groove; the two ends of the limiting spring respectively conflict with the first telescopic column and the limiting block; a limiting groove is provided on the first telescopic sleeve to cooperate with the limiting block.

[0011] As a further solution of the present invention: a heat-conducting rod with a large thermal conductivity coefficient is fixedly installed on the temperature-sensing tank body.

[0012] As a further solution of the present invention: the temperature sensing tank body is in a frustum shape; and the diameter of the surface matching with the piston is relatively small.

[0013] As a further solution of the present invention: the cooling fans arranged on both sides of the cabinet rotate in opposite directions.

[0014] A method for protecting a switch cabinet with instant overheating power-off protection as described above when the temperature inside the switch cabinet rises comprises the following steps: Step 1: The temperature sensing tank constantly monitors the temperature changes in the cabinet, and changes the position of the first connecting rod in real time according to the temperature changes in the cabinet; Step 2: As the temperature inside the cabinet increases, the first connecting rod gradually moves away from the temperature sensing tank. When the first connecting rod moves to the set position, the moving contact and the static contact collide, and the heat dissipation mechanism is energized; the cabinet is cooled down by the heat dissipation mechanism; Step 3: The heat dissipation mechanism continues to dissipate heat and cool the cabinet to slow down the rate of temperature rise in the switch cabinet; Step 4: As the temperature inside the cabinet increases, when the first connecting rod moves to another set position, the power-off mechanism will be activated; the power-off mechanism drives the knife to rotate to separate the knife from the static contact; the cabinet as a whole is in a power-off state to protect the switch cabinet from damage by high temperature.

[0015] Compared with the prior art, the beneficial effects of the present invention are: the temperature change in 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 in the switch cabinet; and in the process of changing the position of the first connecting rod, the power-on state of the heat dissipation mechanism is changed to dissipate heat and cool the switch cabinet through the heat dissipation mechanism to reduce the rate of temperature increase of the switch cabinet; and when the temperature in the switch cabinet reaches the set value, the power-off mechanism is driven to operate to drive the knife and the static contact to separate, so that the switch cabinet is in a power-off state; to avoid damage to the components in the switch cabinet due to excessive temperature, and then to avoid the occurrence of safety accidents; and the temperature sensing mechanism controls the operation of the heat dissipation mechanism and the power-off mechanism through the heat absorption collision of the heat-conducting medium. The heat absorption expansion coefficient of the heat-conducting medium is relatively stable, so the temperature monitoring can be performed more accurately, and the overheating of the switch cabinet and the power-off delay or non-power-off of the power-off mechanism can be effectively avoided; the safety of the switch cabinet is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of an embodiment of a switch cabinet with instant overheating power-off protection and a protection method thereof.

[0017] Figure 2 A schematic structural diagram of a temperature sensing tank in an embodiment of a switch cabinet with instant overheating power-off protection and a protection method thereof.

[0018] Figure 3 for Figure 2 Schematic diagram of the structure at A in the middle.

[0019] Figure 4 A schematic structural diagram of a power-off mechanism in an embodiment of a switch cabinet with instant overheat power-off protection and a protection method thereof.

[0020] Figure 5 for Figure 4 A schematic diagram of the structure from another perspective.

[0021] Figure 6 for Figure 4 Schematic diagram of the structure from a cross-sectional perspective.

[0022] Figure 7 for Figure 6 Schematic diagram of the structure at B in the figure.

[0023] Figure 8 A schematic structural diagram of a first connecting rod in an embodiment of a switch cabinet with instant overheating power-off protection and a protection method thereof.

[0024] Fig. 9 A schematic structural diagram of a heat dissipation mechanism in an embodiment of a switch cabinet with instant overheating power-off protection and a protection method thereof.

[0025] Fig.10 for Fig. 9 Schematic diagram of the structure at C in the middle.

[0026] Fig.11 A schematic structural diagram of a rotating sleeve and a sliding sleeve in an embodiment of a switch cabinet with instant overheating power-off protection and a protection method thereof.

[0027] In the figure: 1, cabinet; 101, heat dissipation channel; 2. Stationary contact; 3. Switch knife; 4. Temperature sensing tank; 401. Heat conducting rod; 5. Piston; 501. Guide rod; 6. first connecting rod; 601. connecting plate; 7. The first hinge block; 8. Rotate the connecting rod; 9. The second hinge block; 10. first telescopic column; 1001. limiting slide groove; 11. first telescopic sleeve; 1101. limiting groove; 12. Power-off spring; 13. Limit spring; 14. Limit block; 15. Sliding rod; 1501. Moving contact; 16. Static contact; 17. Buffer spring; 18. Cooling fan; 19. Motor; 20. Main shaft; 21. Turntable; 22. counterweight block; 2201. second telescopic column; 23. Extrusion sleeve; 2301. Second telescopic sleeve; 24. Fixed shaft; 2401. Second slide groove; 25. sliding sleeve; 2501. protrusion; 2502. inclined groove; 26. Rotating sleeve; 2601. Protruding column; 27. Sealing plate; 28. Return spring. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0030] See also Figure 1 to Figure 11 In an embodiment of the present invention, a switch cabinet with instant overheating power-off protection includes a cabinet body 1; and a switch blade 3 rotatably mounted on the cabinet body 1; a static contact 2 cooperating with the switch blade 3 is fixedly mounted on the cabinet body 1; The cabinet 1 is provided with a temperature sensing mechanism and a heat dissipation mechanism; The temperature sensing mechanism comprises a temperature sensing tank body 4 fixedly installed in the cabinet body 1; a first connecting rod 6 is arranged on the temperature sensing tank body 4; The heat dissipation mechanism includes a heat dissipation fan 18; The switch blade 3 is provided with a power-off mechanism; the power-off mechanism comprises a first telescopic column 10; 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; 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 .

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] The temperature change in the switch cabinet is monitored in real time by the temperature sensing mechanism, and the position of the first connecting rod 6 is changed in real time according to the temperature change in the switch cabinet; and in the process of position change of the first connecting rod 6, the power-on state of the heat dissipation mechanism is changed to dissipate heat and cool the switch cabinet through the heat dissipation mechanism, so as to reduce the rate of temperature increase of the switch cabinet; and when the temperature in the switch cabinet reaches the set value, the power-off mechanism is driven to operate, so as to drive the knife 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 components in the switch cabinet due to excessive temperature, and then avoid the occurrence of safety accidents.

[0038] In another embodiment of the present invention, the temperature sensing mechanism also includes a piston 5 slidably embedded in the temperature sensing tank body 4; a guide rod 501 fixedly connected to the first connecting rod 6 is fixedly installed on the piston 5; 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.

[0039] Taking the embodiment combining all the features described in the present application as an example, when in use, the temperature sensing tank body 4 contains a heat-conducting medium, and the heat-conducting medium expands when absorbing heat.

[0040] When the temperature in the cabinet 1 rises, the heat-conducting medium expands and its volume increases. During the increase in the volume of the heat-conducting medium, the piston 5 is pushed to slide outward in the temperature-sensing tank 4, thereby driving the first connecting rod 6 to gradually move away from the temperature-sensing tank 4 through the guide rod 501.

[0041] During the movement of the first connecting rod 6 , the rotating connecting rod 8 will be driven to rotate toward the first telescopic column 10 , and the 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 change.

[0042] The temperature change in the switch cabinet is monitored in real time by the temperature sensing mechanism, and the position of the first connecting rod 6 is changed in real time according to the temperature change in the switch cabinet; and in the process of position change of the first connecting rod 6, the power-on state of the heat dissipation mechanism is changed to dissipate heat and cool the switch cabinet through the heat dissipation mechanism, so as to reduce the rate of temperature increase of the switch cabinet; and when the temperature in the switch cabinet reaches the set value, the power-off mechanism is driven to operate, so as to drive the knife 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 components in the switch cabinet due to excessive temperature, and then avoid the occurrence of safety accidents.

[0043] 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 wrapped around the sliding rod 15; the two ends of the buffer spring 17 respectively contact with the moving contact 1501 and the connecting plate 601; a static contact 16 that cooperates with the moving contact 1501 is fixedly installed on the cabinet body 1.

[0044] Taking the embodiment combining all the features recorded in this application as an example, when in use, when the first connecting rod 6 moves away from the temperature sensing tank body 4, it will drive the connecting plate 601 to move synchronously, and drive the sliding rod 15 toward the static contact 16 through the buffer spring 17; thereby driving the moving contact 1501 to move toward the static contact 16.

[0045] When the temperature in the cabinet 1 reaches the set warning value, the moving contact 1501 contacts the stationary contact 16; at this time, the switch cabinet can energize the heat dissipation mechanism, thereby dissipating heat and cooling the switch cabinet through the heat dissipation mechanism.

[0046] When the heat dissipation mechanism is activated and the temperature in the switch cabinet continues to rise, 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 will still maintain a contact state; at this time, the heat dissipation mechanism will continue to operate to reduce the rate of temperature rise in the switch cabinet.

[0047] In another embodiment of the present invention, the cabinet 1 is provided with a plurality of heat dissipation channels 101; the heat dissipation mechanism further comprises a sealing disk 27 rotatably mounted on the cabinet 1 and cooperating with the heat dissipation channels 101; a rotating sleeve 26 is fixedly mounted on the sealing disk 27, and a protruding column 2601 is fixedly mounted inside the rotating sleeve 26; a fixed shaft 24 is fixedly mounted on the cabinet 1, and a second slide groove 2401 is provided on the fixed shaft 24; a sliding sleeve 25 is provided on the fixed shaft 24; a protrusion 2501 slidably engaged with the second slide groove 2401 is fixedly mounted on the sliding sleeve 25; an inclined groove 2502 slidably engaged with the protruding column 2601 is provided on the sliding sleeve 25; a reset spring 28 is wrapped around the fixed shaft 24; and the two ends of the reset spring 28 respectively contact the cabinet 1 and the sliding sleeve 25.

[0048] Taking the embodiment combining all the features recorded in the present application as an example, when in use, in the initial state, the sealing disk 27 cooperates with the heat dissipation channel 101 to block the circulation of air between the switch cabinet and the outside world, which can effectively prevent external dust and moisture from entering the switch cabinet.

[0049] When the heat dissipation mechanism is powered on, the motor 19 will start to drive the main shaft 20 to rotate, thereby driving the heat dissipation fan 18 to rotate, so as to speed up the air circulation in the switch cabinet.

[0050] When the main shaft 20 rotates, it will drive the sliding sleeve 25 to slide on the fixed shaft 24 toward the heat dissipation channel 101. At this time, the protrusion 2501 will slide in the second slide groove 2401 and compress the reset 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 squeezing effect of the inclined groove 2502 and the protruding column 2601, it will drive the rotating sleeve 26 to rotate, thereby driving the sealing disk 27 to rotate on the cabinet 1; when the protruding column 2601 slides from one end of the inclined groove 2502 to the other end, the sealing disk 27 rotates to the maximum stroke position, at this time, the heat dissipation channel 101 is opened; the air inside and outside the cabinet 1 can circulate; the switch cabinet is cooled and cooled by the heat dissipation mechanism to reduce the rate of temperature increase of the switch cabinet.

[0051] When the cooling fan 18 stops rotating, the elastic force of the reset spring 28 can drive the sliding sleeve 25 on the fixed shaft 24 away from the cooling channel 101, thereby driving the protruding column 2601 to slide in the inclined groove 2502 in the opposite direction, thereby driving the sealing disk 27 to rotate in the opposite direction and reset to close the cooling channel 101.

[0052] In another embodiment of the present invention, the heat dissipation mechanism also includes a motor 19, and a main rotating shaft 20 fixedly connected to the cooling fan 18 is fixedly mounted on the output end of the motor 19; a turntable 21 is fixedly mounted on the main rotating shaft 20; a counterweight block 22 is slidably engaged on the turntable 21; a second telescopic column 2201 is fixedly mounted on the counterweight block 22; an extrusion sleeve 23 is slidably mounted on the main rotating shaft 20; a second telescopic sleeve 2301 slidably connected to the second telescopic column 2201 is fixedly mounted on the extrusion sleeve 23.

[0053] Taking the embodiment combining all the features recorded in this application as an example, when in use, when the main shaft 20 rotates, it will drive the turntable 21 to rotate, thereby driving the counterweight block 22 to rotate synchronously. Under the action of centrifugal force, the counterweight block 22 will slide on the turntable 21 away from the main shaft 20.

[0054] During the sliding process of the counterweight block 22, the second telescopic column 2201 will be driven to slide outward in the second telescopic sleeve 2301, thereby driving the extrusion sleeve 23 to slide in the direction of the sliding sleeve 25, thereby driving the sliding sleeve 25 to slide in the direction of the heat dissipation channel 101 synchronously, thereby driving the sealing disk 27 to rotate, so as to open the heat dissipation channel 101, thereby accelerating the air flow inside and outside the switch cabinet.

[0055] 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 to the synchronous displacement; during the reset process, the second telescopic column 2201 will slide inward in the second telescopic sleeve 2301 to drive the counterweight block 22 to move closer to the main rotating shaft 20 to complete the reset.

[0056] The switch cabinet is cooled by a heat dissipation mechanism to reduce the rate at which the temperature of the switch cabinet increases.

[0057] In another embodiment of the present invention, the power-off mechanism also includes a first telescopic sleeve 11 fixedly mounted on the cabinet 1, and the first telescopic sleeve 11 is slidably engaged with the first telescopic column 10; a second hinge block 9 hinged to the knife switch 3 is rotatably mounted on the first telescopic column 10; a power-off spring 12 is wrapped around the first telescopic column 10; the two ends of the power-off spring 12 respectively conflict with the first telescopic column 10 and the first telescopic sleeve 11; a limiting groove 1001 is provided on the first telescopic column 10; a limiting block 14 is slidably engaged in the limiting groove 1001; a limiting spring 13 is arranged in the limiting groove 1001; the two ends of the limiting spring 13 respectively conflict with the first telescopic column 10 and the limiting block 14; a limiting groove 1101 cooperating with the limiting block 14 is provided on the first telescopic sleeve 11.

[0058] Taking the embodiment in which all the features recorded in the present application are combined as an example, when in use, an external force is applied to make the knife switch 3 contact the stationary contact 2, the knife switch 3 will drive the first telescopic column 10 to approach the knife switch 3 in the first telescopic sleeve 11 through the second hinge block 9; during the approaching process, the limit block 14 will contact and slide 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 stationary contact 2, the limit block 14 and the first telescopic sleeve 11 will be pressed together. The inner wall of the sleeve 11 is separated, and under the elastic force of the limit spring 13, it slides outward in the limit slot 1001 to enter the limit slot 1101, and the limit slot 1101 and the limit block 14 interfere with each other to prevent the switch knife 3 from separating from the static contact 2; it can effectively avoid the influence of external interference such as vibration, shaking and collision on the switch cabinet (prevent the static contact 2 and the switch knife 3 from automatically separating due to external interference, causing the switch cabinet to be powered off), and effectively improve the stability of the switch cabinet.

[0059] When the temperature in 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 contacts with the limit block 14; as the temperature continues to rise, the first connecting rod 6 continues to move, thereby driving the rotating connecting rod 8 to continue to rotate. At this time, the rotating connecting rod 8 will squeeze the limit block 14, so that the limit block 14 slides inward in the limit slot 1001 to compress the limit spring 13; when the limit block 14 moves to disengage from the limit slot 1101, the power-off spring 13 is The elastic force of 12 will drive the first telescopic column 10 to slide in the first telescopic sleeve 11 in the direction away from the switch knife 3; during the sliding process of the first telescopic column 10, the switch knife 3 will be driven to rotate through the second hinge block 9; at this time, the angle between the second hinge block 9, the first telescopic column 10 and the switch knife 3 will change; when the switch knife 3 rotates, it will move away from the static contact 2, so that the switch knife 3 and the static contact 2 are separated, thereby cutting off the power to the switch cabinet to prevent the components in the switch cabinet from working at an excessively high temperature, thereby avoiding damage to the switch cabinet and even avoiding the occurrence of safety accidents.

[0060] In another embodiment of the present invention, a heat conducting rod 401 with a large thermal conductivity coefficient is fixedly mounted on the temperature sensing tank body 4 .

[0061] Taking the embodiment combining all the features recorded in this application as an example, when in use, the heat conductive rod 401 can effectively improve the perception of the temperature sensing tank 4 to the temperature change in the switch cabinet, and avoid damage to the switch cabinet due to the hysteresis of the monitoring of the temperature sensing tank 4.

[0062] In another embodiment of the present invention, the temperature sensing tank body 4 is in a frustum shape; and the diameter of the surface matching with the piston 5 is relatively small.

[0063] Taking the embodiment combining all the features recorded in the present application as an example, when in use, the heat-conducting medium in the temperature-sensing tank body 4 absorbs heat and expands, and its volume will increase. Since the diameter matched with the piston 5 is smaller, the squeezing force on the piston 5 becomes larger, so that the piston 5 can overcome the elastic force of the buffer spring 17 and the resistance of the sliding of the limit block 14, so that the first connecting rod 6 can drive the rotating connecting rod 8 to rotate to drive the limit block 14 to slide in the inner box of the limit slide groove 1001.

[0064] In another embodiment of the present invention, the cooling fans 18 disposed on two sides of the cabinet 1 rotate in opposite directions.

[0065] Taking an embodiment combining all the features recorded in the present application as an example, when in use, the cooling fan 18 on one side can draw air with a lower outside temperature into the switch cabinet through the cooling channel 101; the cooling fan 18 on the other side can blow the air with a higher temperature in the switch cabinet to the outside through the cooling channel 101, thereby reducing the rate of temperature increase in the switch cabinet.

[0066] A method for protecting a switch cabinet with instant overheating power-off protection as described above when the temperature inside the switch cabinet rises comprises the following steps: Step 1: The temperature sensing tank 4 constantly monitors the temperature change in the cabinet 1, and changes the position of the first connecting rod 6 in real time according to the temperature change in the cabinet 1; Step 2: As the temperature in the cabinet 1 increases, the first connecting rod 6 gradually moves away from the temperature sensing tank 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 energized; the cabinet 1 is cooled by the heat dissipation mechanism; Step 3: The heat dissipation mechanism continues to dissipate heat and cool the cabinet 1 to slow down the rate of temperature rise in the switch cabinet; Step 4: As the temperature inside the cabinet 1 increases, when the first connecting rod 6 moves to another set position, the power-off mechanism will be activated; the power-off mechanism drives the knife 3 to rotate so that the knife 3 is separated from the static contact 2; so that the cabinet 1 is in a power-off state as a whole to protect the switch cabinet from being damaged by high temperature.

[0067] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and range of equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0068] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A switch cabinet with instant overheating power-off protection, comprising a cabinet body (1); and a switch blade (3) rotatably mounted on the cabinet body (1); a stationary contact (2) cooperating with the switch blade (3) is fixedly mounted on the cabinet body (1); It is characterized in that The cabinet (1) is provided with a temperature sensing mechanism and a heat dissipation mechanism; The temperature sensing mechanism comprises a temperature sensing tank body (4) fixedly mounted in the cabinet body (1); a first connecting rod (6) is arranged on the temperature sensing tank body (4); The heat dissipation mechanism comprises a heat dissipation fan (18); The switch blade (3) is provided with a power-off mechanism; the power-off mechanism comprises a first telescopic column (10); The temperature sensing mechanism is capable of driving 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 is energized; and the heat dissipation fan (18) is activated to accelerate the air circulation in the cabinet (1); 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, thereby driving the switch (3) to rotate, thereby driving the switch (3) to separate from the static contact (2).

2. A switch cabinet with instant overheating power-off protection according to claim 1, characterized in that: The temperature sensing mechanism further comprises a piston (5) slidably engaged in the temperature sensing tank body (4); a guide rod (501) fixedly mounted on the piston (5) and fixedly connected to the first connecting rod (6); a rotating connecting rod (8) rotatably mounted on the cabinet body (1); and a first hinge block (7) hinged to the first connecting rod (6) rotatably mounted on the rotating connecting rod (8).

3. A switch cabinet with instant overheating power-off protection according to claim 2, characterized in that: A connecting plate (601) is fixedly mounted on the first connecting rod (6); a sliding rod (15) is slidably mounted on the connecting plate (601); a moving contact (1501) is fixedly mounted on the sliding rod (15); a buffer spring (17) is wrapped around the sliding rod (15); two ends of the buffer spring (17) respectively contact the moving contact (1501) and the connecting plate (601); and a stationary contact (16) cooperating with the moving contact (1501) is fixedly mounted on the cabinet body (1).

4. A switch cabinet with instant overheating power-off protection according to claim 1, characterized in that: The cabinet (1) is provided with a plurality of heat dissipation channels (101); the heat dissipation mechanism further comprises a sealing disk (27) rotatably mounted on the cabinet (1) and cooperating with the heat dissipation channels (101); a rotating sleeve (26) is fixedly mounted on the sealing disk (27), and a protruding column (2601) is fixedly mounted inside the rotating sleeve (26); a fixed shaft (24) is fixedly mounted on the cabinet (1), and a second slide groove (2401) is provided on the fixed shaft (24); The fixed shaft (24) is provided with a sliding sleeve (25); a protrusion (2501) is fixedly mounted on the sliding sleeve (25) and is slidably engaged with the second sliding groove (2401); the sliding sleeve (25) is provided with an inclined groove (2502) that is slidably engaged with the protruding column (2601); a return spring (28) is wrapped around the fixed shaft (24); and two ends of the return spring (28) are respectively in contact with the cabinet (1) and the sliding sleeve (25).

5. A switch cabinet with instant overheating power-off protection according to claim 4, characterized in that: The heat dissipation mechanism further comprises a motor (19); a main rotating shaft (20) fixedly connected to the heat dissipation fan (18) is fixedly mounted on the output end of the motor (19); a rotating disk (21) is fixedly mounted on the main rotating shaft (20); a counterweight block (22) is slidably engaged on the rotating disk (21); a second telescopic column (2201) is fixedly mounted on the counterweight block (22); an extrusion sleeve (23) is slidably mounted on the main rotating shaft (20); and a second telescopic sleeve (2301) slidably connected to the second telescopic column (2201) is fixedly mounted on the extrusion sleeve (23).

6. The switch cabinet with instant overheating power-off protection according to claim 1, characterized in that: The power-off mechanism further comprises a first telescopic sleeve (11) fixedly mounted on the cabinet (1), and the first telescopic sleeve (11) is slidably engaged with the first telescopic column (10); a second hinge block (9) hinged to the switch (3) is rotatably mounted on the first telescopic column (10); a power-off spring (12) is wrapped around the first telescopic column (10); two ends of the power-off spring (12) respectively contact the first telescopic column (10) and the first telescopic sleeve (11); a limit slot (1001) is provided on the first telescopic column (10); a limit block (14) is slidably engaged in the limit slot (1001); a limit spring (13) is provided in the limit slot (1001); two ends of the limit spring (13) respectively contact the first telescopic column (10) and the limit block (14); a limit slot (1101) is provided on the first telescopic sleeve (11) and matches the limit block (14).

7. A switch cabinet with instant overheating power-off protection according to claim 1, characterized in that: A heat-conducting rod (401) with a relatively large thermal conductivity coefficient is fixedly mounted on the temperature-sensing tank body (4).

8. The switch cabinet with instant overheating power-off protection according to claim 2, characterized in that: The temperature sensing tank body (4) is in the shape of a cone, and the diameter of the surface that matches the piston (5) is relatively small.

9. The switch cabinet with instant overheating power-off protection according to claim 1, characterized in that: The cooling fans (18) arranged on both sides of the cabinet (1) rotate in opposite directions.

10. A method for protecting a switch cabinet with instant overheating power-off protection as claimed in any one of claims 1 to 9 when the temperature inside the switch cabinet rises, characterized in that: The steps include: Step 1: The temperature sensing tank (4) constantly monitors the temperature change in the cabinet (1), and changes the position of the first connecting rod (6) in real time according to the temperature change in the cabinet (1); Step 2: As the temperature inside the cabinet (1) increases, the first connecting rod (6) gradually moves away from the temperature sensing tank (4); when the first connecting rod (6) moves to a set position, the moving contact (1501) contacts the stationary contact (16), and the heat dissipation mechanism is energized; the cabinet (1) is cooled by the heat dissipation mechanism; Step 3: The heat dissipation mechanism continues to dissipate heat and cool the cabinet (1) to slow down the rate of temperature rise in the switch cabinet; Step 4: As the temperature inside the cabinet (1) increases, the first connecting rod (6) moves to another set position, and the power-off mechanism is activated; the power-off mechanism drives the knife switch (3) to rotate, so that the knife switch (3) is separated from the static contact (2); so that the cabinet (1) is in a power-off state as a whole, so as to protect the switch cabinet from damage by high temperature.

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