High-voltage switchgear

Abstract

The present invention relates to a high-voltage switch cabinet, comprising a main cabinet, an inner cabinet, a buffer mechanism and a pressure relief mechanism. The inner cabinet is arranged in a accommodating cavity of the main cabinet, and a first accommodating groove is provided in the inner cabinet. The bottom of the first accommodating groove is provided with an installation platform for installing a switch element. The buffer mechanism comprises a first spring and a buffer plate. Four buffer plates are surrounded by the installation platform. The buffer plates are connected to the groove wall of the first accommodating groove through the first spring. The space enclosed by the four buffer plates and the installation platform constitute a closed buffer cavity. The switch element is located in the buffer cavity. A pressure relief port is provided on the inner cabinet body. When the switch element fails, the high-pressure gas generated can push the buffer plate, so that the buffer plate overcomes the elastic force of the first spring to absorb part of the energy. At the same time, the high-pressure gas can push the pressure relief mechanism to open the pressure relief port, so that the high-pressure gas enters the expansion chamber from the buffer cavity for release, effectively preventing the inner cabinet body from exploding due to excessive internal pressure, thereby improving the safety of the high-voltage switch cabinet.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage equipment, and in particular to a high-voltage switch cabinet. Background Art

[0002] A switch cabinet is an electrical device. The external line of the switch cabinet first enters the cabinet and is connected to the main control switch, and then enters the sub-control switch. Each branch is set according to its needs, such as instruments, automatic control, motor magnetic switches and various AC contactors.

[0003] At present, the electrical equipment inside the 10kV high-voltage switchgear has been working under high voltage and high current for a long time, and the high-voltage switchgear is prone to faults. When a serious electrical fault occurs inside the high-voltage switchgear, the high temperature generated by the electric arc can quickly decompose the surrounding air and insulating materials, producing a large amount of gas, causing the pressure to rise sharply instantly, and then causing the switchgear to explode, causing damage to the switchgear cabinet structure and even causing injuries to the operators, resulting in low safety of use. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a high-voltage switchgear with good protection performance and high safety in use.

[0005] To achieve this purpose, the embodiment of the present invention adopts the following technical solutions:

[0006] A high-voltage switchgear is provided, comprising a main cabinet, an inner cabinet, a buffer mechanism and a pressure relief mechanism, wherein a receiving cavity is provided in the main cabinet, the inner cabinet is provided in the receiving cavity and is separated from the cavity wall of the receiving cavity to form an expansion chamber, the main cabinet is further provided with a heat dissipation port communicating with the expansion chamber, the inner cabinet comprises an inner cabinet body and an inner cabinet door, the inner cabinet body is recessed with a first receiving groove, the inner cabinet door is used to block the groove opening of the first receiving groove, the bottom of the first receiving groove is protruding with a mounting platform for mounting a switch element, the buffer mechanism comprises a first spring and four buffer plates, the four buffer plates are respectively surrounded by the periphery of the mounting platform, and each of the buffer plates is connected to the groove wall of the first receiving groove by at least one first spring, the four buffer plates The enclosed space is located between the inner cabinet door and the mounting platform to form a closed buffer chamber, the switching element is located in the buffer chamber, the pressure relief mechanism includes a clamping block and a second spring, and the inner cabinet body is also provided with a pressure relief port connected to the first receiving groove, the clamping block is connected to the main cabinet through the second spring, and the second spring always has a tendency to push the clamping block to block the pressure relief port. When the switching element fails, the high-pressure gas generated can push the buffer plate, so that the buffer plate overcomes the elastic force of the first spring and moves toward the groove wall of the first receiving groove to absorb part of the energy. At the same time, the high-pressure gas can push the clamping block to separate from the pressure relief port, so that the high-pressure gas can enter the expansion chamber from the buffer chamber for release.

[0007] As a preferred solution for a high-voltage switchgear, the length of the pressure relief port extends along a first direction, two first slide grooves are arranged on the inner cabinet body at intervals along the first direction, the first slide grooves are connected to the pressure relief port, and two sliders are provided on the side of the clamping block facing the inner cabinet body corresponding to the two first slide grooves, the sliders are slidably connected to the first slide grooves, and the side of the slider away from the clamping block abuts against the buffer plate.

[0008] As a preferred solution for a high-voltage switchgear, there are four pressure relief ports, each of which passes through two adjacent groove walls of the first accommodating groove, and each pressure relief port is correspondingly provided with a pressure relief mechanism. The high-voltage switchgear also includes a third spring, a linkage assembly and four recoil plates. The four recoil plates are arranged around the outer periphery of the inner cabinet body, and a connecting port is provided on the inner cabinet body. The third spring is provided at the connecting port. Each recoil plate is connected to a buffer plate through at least one third spring. The recoil plate is provided with the linkage assembly at both ends along its own length direction, and the linkage assembly is connected to the slider. Under the push of the high-pressure gas, the buffer plate pushes the slider toward the main cabinet, and the slider pushes the recoil plate toward the inner cabinet body through the linkage assembly, and the third spring provides a force toward the switching element to the buffer plate.

[0009] As a preferred solution for a high-voltage switchgear, two linkage assemblies are provided on each of the sliders, and the two linkage assemblies are respectively connected to two adjacent recoil plates. The linkage assembly includes a support seat, a swing arm, a first connecting rod and a second connecting rod. The support seat is provided on the cavity wall of the accommodating cavity, and the swing arm is rotatably connected to the support seat. The swing arm has a first section and a second section located on both sides of its own rotation center along its own length direction. One end of the first connecting rod is fixedly connected to the slider, and the other end of the first connecting rod is slidably connected to the first section. One end of the second connecting rod is fixedly connected to the recoil plate, and the other end of the second connecting rod is slidably connected to the second section.

[0010] As a preferred solution for the high-voltage switchgear, the linkage assembly also includes a torsion spring, a connecting shaft protruding from the support seat, the swing arm is rotatably connected to the connecting shaft, the torsion spring is sleeved on the outer periphery of the connecting shaft, and the two ends of the torsion spring are respectively connected to the support seat and the swing arm.

[0011] As a preferred solution of the high-voltage switchgear, a second chute is provided on the first section, the length of the second chute extends along the length direction of the swing arm, and the first connecting rod is provided with a first guide rod protruding toward one side of the swing arm, and the first guide rod is inserted into the second chute; and / or,

[0012] A third sliding groove is provided on the second section, and the length of the third sliding groove extends along the length direction of the swing arm. The second connecting rod is provided with a second guide rod protruding toward one side of the swing arm, and the second guide rod is inserted into the third sliding groove.

[0013] As a preferred solution for the high-voltage switchgear, the recoil plate is provided with a first positioning flange protruding toward the side of the buffer plate and relative to the connecting port, and the buffer plate is provided with a second positioning flange protruding toward the side of the recoil plate and relative to the connecting port, and the two ends of the third spring are respectively inserted into the first positioning flange and the second positioning flange.

[0014] As a preferred solution for the high-voltage switchgear, a third guide rod is protruding from the clamping block toward one side of the main cabinet, a first guide hole is recessed on the main cabinet, the third guide rod is inserted into the first guide hole, and the second spring is sleeved on the outer periphery of the third guide rod.

[0015] As a preferred solution for the high-voltage switchgear, a fourth guide rod is protruding from the side of the buffer plate away from the mounting platform, a second guide hole is recessed on the inner cabinet body, the fourth guide rod is inserted into the second guide hole, and the first spring is sleeved on the outer periphery of the fourth guide rod.

[0016] As a preferred solution for the high-voltage switchgear, the high-voltage switchgear also includes a fixed shaft and heat dissipation fins. The inner cabinet body is arranged on the cavity wall of the accommodating cavity through the fixed shaft, and part of the fixed shaft extends into the mounting platform. The heat dissipation fins are sleeved on the outer periphery of the fixed shaft, and the heat dissipation openings are evenly distributed around the fixed shaft.

[0017] The beneficial effects of the embodiments of the present invention are as follows: by utilizing the four buffer plates enclosed on the periphery of the mounting platform and the inner cabinet door to form a closed buffer chamber to protect the switching element, the high-pressure gas generated when the switching element fails can first pass through the impact buffer plate, so that the buffer plate overcomes the elastic force of the first spring and absorbs part of the impact force generated by the high-pressure gas, thereby reducing the impact of the instantaneous impact of the high-pressure gas on the inner cabinet body; the buffer plate overcomes the elastic force of the first spring and moves toward the wall of the first accommodating groove to separate the abutment between the two adjacent buffer plates, and the high-pressure gas in the buffer chamber pushes the tightening block to separate from the pressure relief port, so that the high-pressure gas can enter the expansion chamber from the buffer chamber and be released from the heat dissipation port, effectively preventing the inner cabinet body from exploding due to excessive internal pressure and causing structural damage, thereby improving the use safety of the high-voltage switch cabinet and reducing the occurrence of damage to the cabinet structure of the switch cabinet or injury to operators due to explosion caused by switching element failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0019] Figure 1 Schematic diagram of the structure of a high-voltage switchgear according to an embodiment of the present invention.

[0020] Figure 2A cross-sectional view of a high-voltage switchgear according to an embodiment of the present invention Figure 1 .

[0021] Figure 3 A cross-sectional view of a high-voltage switchgear according to an embodiment of the present invention Figure 2 .

[0022] Figure 4 Schematic diagram of an explosion of a high-voltage switchgear according to an embodiment of the present invention.

[0023] Figure 5 A cross-sectional view of a high-voltage switchgear according to an embodiment of the present invention Figure 3 .

[0024] Figure 6 for Figure 5 An enlarged schematic diagram of point A.

[0025] Figure 7 A cross-sectional view of a high-voltage switchgear according to an embodiment of the present invention Figure 4 .

[0026] Figure 8 for Figure 7 An enlarged schematic diagram of point B.

[0027] Figure 9 Schematic diagram of the internal structure of the high-voltage switchgear according to an embodiment of the present invention Figure 1 .

[0028] Figure 10 for Figure 9 An enlarged schematic diagram of point C.

[0029] Figure 11 Schematic diagram of the internal structure of the high-voltage switchgear according to an embodiment of the present invention Figure 2 .

[0030] Figure 12 for Figure 11 An enlarged schematic diagram of point D.

[0031] Figure 13 for Figure 11 Enlarged schematic diagram of point E.

[0032] In the picture:

[0033] 1. Main cabinet; 11. Accommodation cavity; 12. Heat dissipation vent; 13. First guide hole; 2. Inner cabinet; 21. Inner cabinet body; 211. First accommodation slot; 212. Pressure relief vent; 213. First slide; 22. Inner cabinet door; 23. Mounting platform; 3. Buffer mechanism; 31. First spring; 32. Buffer plate; 33. Fourth guide rod; 4. Pressure relief mechanism; 41. Tightening block; 42. Second spring; 43. Slider; 44. Three guide rods; 5. Buffer chamber; 6. Third spring; 7. Linkage assembly; 71. Support seat; 711. Connecting shaft; 72. Swing arm; 721. First section; 7211. Second slide groove; 722. Second section; 7221. Third slide groove; 73. First connecting rod; 731. First guide rod; 74. Second connecting rod; 741. Second guide rod; 75. Torsion spring; 8. Recoil plate; 9. Fixed shaft; 10. Heat dissipation fin. DETAILED DESCRIPTION

[0034] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention more clearly understood, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It is apparent that the described embodiments are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0035] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] like Figures 1 to 13As shown, the high-voltage switchgear of the embodiment of the present invention includes a main cabinet 1, an inner cabinet 2, a buffer mechanism 3 and a pressure relief mechanism 4. The main cabinet 1 is provided with a receiving chamber 11, the inner cabinet 2 is provided in the receiving chamber 11 and is separated from the cavity wall of the receiving chamber 11 to form an expansion chamber. The main cabinet 1 is also provided with a heat dissipation port 12 communicating with the expansion chamber. The inner cabinet 2 includes an inner cabinet body 21 and an inner cabinet door 22. The inner cabinet body 21 is recessed with a first receiving groove 211. The inner cabinet door 22 is used to block the notch of the first receiving groove 211. The bottom of the first receiving groove 211 is protruding with an installation platform 23 for installing a switch element. The buffer mechanism 3 includes a first spring 31 and four buffer plates 32. The four buffer plates 32 are respectively enclosed on the sides of the mounting platform 23, and each buffer plate 32 is connected to the groove wall of the first accommodating groove 211 through at least one first spring 31. The space enclosed by the four buffer plates 32 and the closed space between the inner cabinet door 22 and the mounting platform 23 is the buffer cavity 5. The switching element is located in the buffer cavity 5. The pressure relief mechanism 4 includes a tightening block 41 and a second spring 42. A pressure relief port 212 communicating with the first accommodating groove 211 is also provided on the inner cabinet body 21. The tightening block 41 is connected to the main cabinet 1 through the second spring 42. The second spring 42 always has a tendency to push the tightening block 41 to block the pressure relief port 212.

[0038] It is understood that the main cabinet 1 includes a main cabinet body and a main cabinet door. The main cabinet body is provided with a second receiving groove. The main cabinet door blocks the notch of the second receiving groove to form a first receiving chamber 11. The main cabinet door is spaced apart on one side of the inner cabinet door 22. The switch element is installed by opening the main cabinet door and the inner cabinet door 22. In this embodiment, the mounting platform 23 is a square structure. When the switch element is in normal use, the two adjacent buffer plates 32 fit together to ensure the closure of the buffer chamber 5. The abutment block 41 abuts against the inner cabinet body 21 under the drive of the second spring 42 to block the pressure relief port 212, ensuring a closed environment within the inner cabinet body 21, thereby enhancing the safety protection of the inner cabinet body 21. When the switch element fails, the high-pressure gas generated can push the buffer plate 32, causing the buffer plate 32 to overcome the elastic force of the first spring 31 and move toward the groove wall of the first receiving groove 211 to absorb some energy. At the same time, the high-pressure gas can push the abutment block 41 to separate from the pressure relief port 212, so that the high-pressure gas can enter the expansion chamber from the buffer chamber 5 for release.

[0039] The switch element is protected by forming a closed buffer chamber 5 with the four buffer plates 32 enclosed on the side of the mounting platform 23 and the inner cabinet door 22. The high-pressure gas generated when the switch element fails can first pass through the impact buffer plate 32, so that the buffer plate 32 overcomes the elastic force of the first spring 31 to absorb part of the impact force generated by the high-pressure gas, reducing the impact of the instantaneous impact of the high-pressure gas on the inner cabinet body 21; the buffer plate 32 overcomes the elastic force of the first spring 31 and moves toward the wall of the first accommodating groove 211 to separate the abutment between the two adjacent buffer plates 32, and the high-pressure gas in the buffer chamber 5 enters the first accommodating groove 211 to push the tightening block 41 to separate from the pressure relief port 212, so that the high-pressure gas can enter the expansion chamber from the buffer chamber 5 and be released from the heat dissipation port 12, effectively preventing the inner cabinet body 21 from exploding due to excessive internal pressure and causing structural damage, thereby improving the use safety of the high-voltage switch cabinet and reducing the occurrence of cabinet structure damage or injury to operators caused by explosion due to switch element failure.

[0040] Optionally, the length of the pressure relief port 212 extends along a first direction, and two first chutes 213 are provided on the inner cabinet 21 at intervals along the first direction (the first direction is the X direction in the figure). The first chutes 213 are connected to the pressure relief port 212. Two sliders 43 are provided on the side of the abutting block 41 facing the inner cabinet 21, corresponding to the two first chutes 213. The sliders 43 are slidably connected to the first chutes 213, and the side of the slider 43 away from the abutting block 41 abuts against the buffer plate 32. The sliding cooperation between the sliders 43 and the first chutes 213 strengthens the movement guidance of the abutting block 41, ensures smooth movement of the abutting block 41, and improves the matching accuracy between the abutting block 41 and the inner cabinet 21. It should be noted that, in this embodiment, the length of the clamping block 41 extends along the first direction, and the two sliders 43 on each clamping block 41 are respectively arranged at the two ends of the length direction of the clamping block 41, and the two first slide grooves 213 are arranged at the two ends of the length direction of the pressure relief port 212. The first slide groove 213 is communicated with the first accommodating groove 211, and the first slide groove 213 is used for allowing the slider 43 to pass through the inner cabinet 21 and abut against the buffer plate 32.

[0041] In this embodiment, there are four pressure relief ports 212, each of which passes through two adjacent groove walls of the first accommodating groove 211. Each pressure relief port 212 is correspondingly provided with a pressure relief mechanism 4. The high-voltage switchgear further includes a third spring 6, a linkage assembly 7 and four recoil plates 8. The four recoil plates 8 are arranged around the outer periphery of the inner cabinet 21. A connecting port is provided on the inner cabinet 21, and a third spring 6 is provided at the connecting port. Each recoil plate 8 is connected to a buffer plate 32 through at least one third spring 6. The recoil plate 8 is provided with a linkage assembly 7 at both ends along its own length direction, and the linkage assembly 7 is connected to the slider 43. That is, the pressure relief ports 212 are provided at the four corner ends of the inner cabinet 21, and a recoil plate 8 is provided between two adjacent pressure relief mechanisms 4. The high-pressure gas generated when a switching element fails will instantly generate an outward impact force to push the buffer plate 32, so that the buffer plate 32 pushes the slider 43 toward the main cabinet 1, and the slider 43 pushes the recoil plate 8 toward the inner cabinet body 21 through the linkage assembly 7. The recoil plate 8 provides a force toward the switching element to the buffer plate 32 through the third spring 6, that is, provides the buffer plate 32 with a resisting force opposite to the instantaneous impact force brought by the high-pressure gas generated by the switching element failure, so that the buffer plate 32 can perform a secondary buffering of the impact force generated by the switching element failure, further consume the impact energy generated by the high-pressure gas, and enhance the buffering effect of the buffer plate 32 against the instantaneous impact caused by the switching element failure, that is, further enhance the buffering performance of the buffer mechanism 3, thereby enhancing the safety protection of the high-voltage switch cabinet.

[0042] Furthermore, each slider 43 is provided with two linkage assemblies 7, which are respectively connected to two adjacent recoil plates 8. The linkage assemblies 7 include a support base 71, a swing arm 72, a first connecting rod 73, and a second connecting rod 74. The support base 71 is provided on the cavity wall of the accommodating cavity 11. The swing arm 72 is rotatably connected to the support base 71. The swing arm 72 has a first section 721 and a second section 722 located on either side of its rotation center along its length. One end of the first connecting rod 73 is fixedly connected to the slider 43, and the other end of the first connecting rod 73 is slidably connected to the first section 721. One end of the second connecting rod 74 is fixedly connected to the recoil plate 8, and the other end of the second connecting rod 74 is slidably connected to the second section 722. In other words, a pressure relief mechanism 4 can synchronously push the recoil plates 8 on both sides of the pressure relief mechanism 4, thereby improving the synchronization of the pushing of the recoil plates 8.

[0043] Specifically, taking a buffer plate 32, a pressure relief mechanism 4, a linkage assembly 7, and a recoil plate 8 as examples, the first section 721 is provided with a second chute 7211, the length of which extends along the length of the swing arm 72. The first connecting rod 73 is provided with a first guide rod 731 protruding toward one side of the swing arm 72, and the first guide rod 731 is inserted into the second chute 7211. The second section 722 is provided with a third chute 7221, the length of which extends along the length of the swing arm 72. The second connecting rod 74 is provided with a second guide rod 741 protruding toward one side of the swing arm 72, and the second guide rod 741 is inserted into the third chute 7221. When the cam 721 is in the unlocked position, the first guide rod 731 is in the unlocked position, and the second guide rod 732 is in the unlocked position, so that the cam 721 is unlocked and the second guide rod 733 is unlocked. In actual application, each clamping block 41 is provided with two sliders 43 in the length direction, and each slider 43 is provided with two linkage components 7, that is, each clamping block 41 simultaneously links the two adjacent recoil plates 8 on both sides of the clamping block 41, and each recoil plate 8 is provided with a clamping block 41 on both sides, that is, each recoil plate 8 is connected to the four corner ends of each recoil plate 8 with a linkage component 7 to ensure the smooth pushing of the recoil plate 8.

[0044] Furthermore, the linkage assembly 7 further includes a torsion spring 75. A connecting shaft 711 protrudes from the support base 71, and the swing arm 72 is rotatably connected to the connecting shaft 711. The torsion spring 75 is sleeved around the outer periphery of the connecting shaft 711, and the two ends of the torsion spring 75 are respectively connected to the support base 71 and the swing arm 72. After the slider 43 pushes the linkage assembly 7 to move the recoil plate 8 toward the mounting platform 23, the torsion spring 75 is in a torsion state. After the pressure in the buffer chamber 5 returns to normal, the elasticity of the torsion spring 75 facilitates driving the swing arm 72 and the slider 43 and recoil plate 8 connected thereto to return to their normal state. That is, the provision of the torsion spring 75 facilitates ensuring that the linkage assembly 7 can return to its initial position after the pressure in the buffer chamber 5 is balanced.

[0045] Preferably, a first positioning flange is provided on the side of the recoil plate 8 facing the buffer plate 32 and opposite the communication port, and a second positioning flange is provided on the side of the buffer plate 32 facing the recoil plate 8 and opposite the communication port. The ends of the third spring 6 are respectively inserted into the first and second positioning flanges. The provision of the first and second positioning flanges ensures the positioning of the third spring 6, prevents it from being dislodged from the assembly position, and improves the convenience of connecting the third spring 6.

[0046] In other embodiments, a third guide rod 44 is provided on the side of the abutting block 41 protruding toward the main cabinet 1, a first guide hole 13 is recessed on the main cabinet 1, the third guide rod 44 is inserted into the first guide hole 13, and the second spring 42 is sleeved around the outer circumference of the third guide rod 44. The sliding fit between the third guide rod 44 and the first guide hole 13 effectively improves the movement guidance and movement stability of the abutting block 41, thereby ensuring the stability of the abutment between the abutting block 41 and the inner cabinet body 21, that is, the positional accuracy of the abutting block 41 in blocking the pressure relief port 212. In addition, the third guide rod 44 guides the second spring 42, reducing the deformation of the second spring 42 in other directions, and effectively ensuring the service life of the second spring 42.

[0047] Optionally, a fourth guide rod 33 protrudes from the side of the buffer plate 32 away from the mounting platform 23. A second guide hole is recessed in the inner cabinet 21. The fourth guide rod 33 is inserted into the second guide hole, and the first spring 31 is sleeved around the outer periphery of the fourth guide rod 33. The sliding fit between the fourth guide rod 33 and the second guide hole effectively ensures the smooth movement of the buffer plate 32 and ensures that the force release direction of the abutment block 41 is along the length of the first guide rod 731. This ensures that the direction of force during the subsequent reverse push of the recoil plate 8 is consistent, maximizing the impact force offset. Furthermore, the fourth guide rod 33's guidance of the first spring 31 reduces deformation of the first spring 31 in other directions, effectively ensuring the service life of the first spring 31.

[0048] Furthermore, the high-voltage switchgear cabinet also includes a fixed shaft 9 and heat dissipation fins 10. The inner cabinet body 21 is set on the cavity wall of the accommodating cavity 11 through the fixed shaft 9, and part of the fixed shaft 9 extends into the mounting platform 23. The heat dissipation fins 10 are sleeved on the outer periphery of the fixed shaft 9, and the heat dissipation vents 12 are evenly distributed around the fixed shaft 9. The provision of the fixed shaft 9 enables the inner cabinet 2 to be spaced apart within the accommodating cavity 11, ensuring communication between the expansion chamber and the heat dissipation vents 12. Of course, to ensure the connection strength between the inner cabinet 2 and the accommodating cavity 11, multiple fixed shafts 9 can be provided. For example, a fixed shaft 9 is provided on each wall of the second accommodating groove and connected to the inner cabinet body 21. The heat generated by the switch element during operation is transferred to the fixed shaft 9 through the mounting platform 23 and then dissipated by the main cabinet 1. That is, the fixed shaft 9 can also improve the heat dissipation effect of the mounting platform 23. The provision of the heat dissipation fins 10 can further enhance the heat dissipation efficiency of the fixed shaft 9. In addition, the heat dissipation fins 10 help to improve the heat dissipation efficiency in the main cabinet 1, reduce the temperature of the high-pressure gas transferred to the expansion chamber, reduce the risk of sudden pressure increase due to high temperature, and ensure the safe and stable operation of the entire electrical equipment. Finally, the cooled gas flows out from the heat dissipation port 12, releasing the pressure while dissipating the heat in the expansion chamber.

[0049] In the description of this article, it should be understood that the terms "upper", "lower", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0050] In the description of this specification, the description of reference terms such as "an embodiment" means that the specific features, structures, materials, or characteristics of the embodiment are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment.

[0051] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method 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 can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0052] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and are not to be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will readily conceive of other specific embodiments of the present invention without inventive effort, and such embodiments will fall within the scope of protection of the present invention.

Claims

1. A high-voltage switchgear, characterized in that: The utility model comprises a main cabinet, an inner cabinet, a buffer mechanism and a pressure relief mechanism, wherein a receiving cavity is provided in the main cabinet, the inner cabinet is provided in the receiving cavity and is separated from the cavity wall of the receiving cavity to form an expansion chamber, and the main cabinet is also provided with a heat dissipation port communicating with the expansion chamber, the inner cabinet comprises an inner cabinet body and an inner cabinet door, the inner cabinet body is recessed with a first receiving groove, the inner cabinet door is used to block the notch of the first receiving groove, the bottom of the first receiving groove is protruding with a mounting platform for mounting a switch element, the buffer mechanism comprises a first spring and four buffer plates, the four The buffer plates are respectively enclosed around the periphery of the mounting platform, and each of the buffer plates is connected to the groove wall of the first receiving groove through at least one first spring. The space enclosed by the four buffer plates is located between the inner cabinet door and the mounting platform to form a closed buffer cavity. The switch element is located in the buffer cavity. The pressure relief mechanism includes a tightening block and a second spring. The inner cabinet body is also provided with a pressure relief port communicating with the first receiving groove. The tightening block is connected to the main cabinet through the second spring. The second spring always has the function of pushing the tightening block. The tightening block blocks the tendency of the pressure relief port. When the switching element fails, the high-pressure gas generated can push the buffer plate, causing the buffer plate to overcome the elastic force of the first spring and move toward the wall of the first accommodating slot to absorb part of the energy. At the same time, the high-pressure gas can push the tightening block to separate from the pressure relief port, so that the high-pressure gas can enter the expansion chamber from the buffer cavity for release; the high-voltage switchgear also includes a third spring, a linkage assembly and four recoil plates. The four recoil plates are arranged around the outer periphery of the inner cabinet body. The inner cabinet body is provided with a connecting port, and the third spring is provided at the connecting port. Each recoil plate is connected to a buffer plate through at least one third spring. The recoil plate is provided with the linkage assembly at both ends along its own length. The linkage assembly is connected to the tightening block. Under the push of the high-pressure gas, the buffer plate pushes the tightening block to move toward the main cabinet. The tightening block pushes the recoil plate to move toward the inner cabinet body through the linkage assembly, and the third spring provides the buffer plate with a force toward the switching element.

2. The high-voltage switchgear according to claim 1, characterized in that: The length of the pressure relief port extends along a first direction, and two first slide grooves are arranged on the inner cabinet body at intervals along the first direction. The first slide grooves are connected to the pressure relief port, and two sliders are provided on the side of the tightening block facing the inner cabinet body corresponding to the two first slide grooves. The sliders are slidably connected to the first slide grooves, and the side of the slider away from the tightening block abuts against the buffer plate.

3. The high-voltage switchgear according to claim 2, characterized in that: There are four pressure relief ports, each of which penetrates two adjacent groove walls of the first accommodating groove. Each pressure relief port is correspondingly provided with a pressure relief mechanism. The linkage assembly is connected to the slider. Under the push of the high-pressure gas, the buffer plate pushes the slider toward the main cabinet, and the slider pushes the recoil plate toward the inner cabinet through the linkage assembly.

4. The high-voltage switchgear according to claim 3, characterized in that: Each of the sliders is provided with two linkage assemblies, and the two linkage assemblies are respectively connected to two adjacent recoil plates. The linkage assembly includes a support seat, a swing arm, a first connecting rod and a second connecting rod. The support seat is provided on the cavity wall of the accommodating cavity, and the swing arm is rotatably connected to the support seat. The swing arm has a first section and a second section located on both sides of its own rotation center along its own length direction. One end of the first connecting rod is fixedly connected to the slider, and the other end of the first connecting rod is slidably connected to the first section. One end of the second connecting rod is fixedly connected to the recoil plate, and the other end of the second connecting rod is slidably connected to the second section.

5. The high-voltage switchgear according to claim 4, characterized in that: The linkage assembly also includes a torsion spring. A connecting shaft is protruding from the support seat. The swing arm is rotatably connected to the connecting shaft. The torsion spring is sleeved on the outer circumference of the connecting shaft, and the two ends of the torsion spring are respectively connected to the support seat and the swing arm.

6. The high-voltage switchgear according to claim 4, characterized in that: A second chute is provided on the first section, the length of the second chute extends along the length direction of the swing arm, the first connecting rod is provided with a first guide rod protruding toward one side of the swing arm, and the first guide rod is inserted into the second chute; and / or, A third sliding groove is provided on the second section, and the length of the third sliding groove extends along the length direction of the swing arm. The second connecting rod is provided with a second guide rod protruding toward one side of the swing arm, and the second guide rod is inserted into the third sliding groove.

7. The high-voltage switchgear according to claim 3, characterized in that: The recoil plate is provided with a first positioning flange protruding toward the side of the buffer plate and relative to the communicating port, and the buffer plate is provided with a second positioning flange protruding toward the side of the recoil plate and relative to the communicating port, and the two ends of the third spring are respectively inserted into the first positioning flange and the second positioning flange.

8. The high-voltage switchgear according to any one of claims 1 to 7, characterized in that: A third guide rod is protruding from one side of the pressing block toward the main cabinet, a first guide hole is recessed on the main cabinet, the third guide rod is inserted into the first guide hole, and the second spring is sleeved on the outer periphery of the third guide rod.

9. The high-voltage switchgear according to any one of claims 1 to 7, characterized in that: A fourth guide rod is protruding from one side of the buffer plate away from the mounting platform, a second guide hole is recessed on the inner cabinet, the fourth guide rod is inserted into the second guide hole, and the first spring is sleeved on the outer periphery of the fourth guide rod.

10. The high-voltage switchgear according to any one of claims 1 to 7, characterized in that: The high-voltage switch cabinet also includes a fixed shaft and heat dissipation fins. The inner cabinet body is arranged on the cavity wall of the accommodating cavity through the fixed shaft, and part of the fixed shaft extends into the mounting platform. The heat dissipation fins are sleeved on the outer periphery of the fixed shaft, and the heat dissipation openings are evenly distributed around the fixed shaft.

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