Low-voltage fixed switchgear

Abstract

This application relates to the technical field of switchgear. A low-voltage fixed switchgear includes a cabinet, a door, and a fixing mechanism. Three cabinets are arranged vertically in sequence. Each cabinet has a receiving cavity. The door is rotatably connected to the cabinet and covers the opening of the receiving cavity. A first connecting block is connected to the side of the middle and lower cabinets away from the door, and a second connecting block is connected to the side of the upper and middle cabinets away from the door. The fixing mechanism is connected to the middle and lower cabinets and is used to fix the first and second connecting blocks to achieve fixation between adjacent cabinets. The switchgear is constructed by assembling the three cabinets vertically, facilitating the handling and installation of the switchgear. The fixing mechanism secures the first and second connecting blocks on adjacent cabinets, thereby achieving fixation between adjacent cabinets, simplifying the assembly process and improving work efficiency.

Description

Technical Field

[0001] This application relates to the technical field of switchgear, and in particular to a low-voltage fixed switchgear. Background Technology

[0002] A switchgear is an electrical device whose main function is to open, close, control, and protect electrical equipment during power generation, transmission, distribution, and energy conversion in a power system. Switchgear can be classified in many ways, such as by circuit breaker installation method (removable switchgear and fixed switchgear); or by cabinet structure (open switchgear, metal-enclosed switchgear, and metal-enclosed armored switchgear); and by voltage level (high-voltage switchgear, medium-voltage switchgear, and low-voltage switchgear). It is mainly suitable for various applications including power plants, substations, petrochemical plants, metallurgical steel rolling mills, light industry and textiles, factories and mines, residential communities, and high-rise buildings.

[0003] However, current switch cabinets are of a single integrated structure, which is inconvenient to assemble, thus making them difficult to store and transport, resulting in unsatisfactory performance. Summary of the Invention

[0004] To simplify the assembly process and improve work efficiency, this application provides a low-voltage fixed switchgear.

[0005] The low-voltage fixed switchgear provided in this application adopts the following technical solution:

[0006] A low-voltage fixed switchgear includes a cabinet body, a cabinet door, and a fixing mechanism. Three cabinet bodies are arranged vertically in sequence. Each cabinet body has a receiving cavity. The cabinet door is rotatably connected to the cabinet body and covers the opening of the receiving cavity. A first connecting block is connected to the side of the middle and lower cabinet bodies away from the cabinet door, and a second connecting block is connected to the side of the upper and middle cabinet bodies away from the cabinet door. The fixing mechanism is connected to the middle and lower cabinet bodies and is used to fix the first and second connecting blocks to achieve fixation between adjacent cabinet bodies.

[0007] By adopting the above technical solution, the switch cabinet is assembled vertically by three cabinets, which facilitates the handling and installation of the switch cabinet; the fixing mechanism realizes the fixing between the first connecting block and the second connecting block on two adjacent cabinets, thereby realizing the fixing between two adjacent cabinets, simplifying the assembly process of the switch cabinet and improving work efficiency.

[0008] Preferably, the fixing mechanism includes a worm gear, a worm wheel, a lead screw, and a fixing block. The worm wheel is rotatably connected to the cabinet body and meshes with the worm gear. The lead screw is coaxially fixedly connected to the worm wheel. The fixing block is slidably connected to the cabinet body, and the sliding direction of the fixing block is parallel to the axial direction of the lead screw. The fixing block is threadedly connected to the lead screw. The first connecting block is provided with a first limiting hole, and the second connecting block is provided with a second limiting hole. The fixing block is embedded in the first limiting hole and the second limiting hole to achieve fixing between two adjacent cabinet bodies.

[0009] By adopting the above technical solution, rotating the worm gear drives the worm wheel to rotate, which in turn drives the fixed block to slide, so that the fixed block is embedded in the first limit hole and the second limit hole, thereby fixing the first connecting block and the second connecting block, and thus fixing the two adjacent cabinets. The worm wheel and worm gear have a self-locking feature, which reduces the possibility of the fixed block being dislodged from the first limit hole and the second limit hole due to vibration, allowing relative movement between the two adjacent cabinets and improving the reliability of the switch cabinet.

[0010] Preferably, the device further includes a protective cover connected to the cabinet. The protective cover has a mounting cavity in which the worm gear and worm are embedded. The end of the lead screw away from the cabinet extends out of the protective cover. The fixing mechanism also includes a handle, a clamping block, a second resetting member, and a fixing member. The clamping block is slidably connected to the protective cover, and the sliding direction of the clamping block is parallel to the radial direction of the worm. The second resetting member is connected between the clamping block and the protective cover, and the second resetting member causes the clamping block to tend to press against the outer wall of the worm. The handle is slidably connected to the worm, and the sliding direction of the handle is parallel to the axial direction of the worm. The side of the clamping block away from the cabinet has a first chamfer, which is located on the side of the clamping block closest to the worm. The first chamfer is used for the handle to abut against the worm. The fixing member is connected to the worm and is used to achieve relative fixation of the handle and the worm along the axial direction.

[0011] By adopting the above technical solution, the protective cover is used to prevent external objects from directly contacting the worm gear and worm, reducing the possibility of damage to the worm gear and worm and improving the service life of the switchgear; the clamping block clamps against the outer wall of the worm, reducing the possibility of the worm rotating under external force, improving the stability of the fixed component connection, and thus improving the reliability of the switchgear; the handle abuts against the first chamfer, causing the clamping block to move away from the worm, making it easier to rotate the handle, drive the worm to rotate, and thus drive the fixed block to slide.

[0012] Preferably, the fixing member includes an insert and a third reset member. The insert is slidably connected to the worm gear, and the sliding direction of the insert is parallel to the radial direction of the worm gear. The inner circumference of the handle is provided with a groove for the insert to be inserted. The third reset member is connected between the insert and the worm gear, and the third reset member makes the insert tend to be inserted into the groove. The bottom of the groove is provided with a connecting hole, and the connecting hole connects the groove to the outside.

[0013] By adopting the above technical solution, the insert is embedded in the groove to fix the handle and the worm gear relatively along the axial direction. The connecting hole is connected to the outside, which makes it easy to push the insert to overcome the elastic force of the third reset member and disengage from the groove by the push rod, thereby unlocking the handle and the worm gear and reducing the cost of use.

[0014] Preferably, the upper ends of the middle and lower cabinets are connected to positioning strips, and the lower ends of the middle and upper cabinets are provided with positioning grooves for the positioning strips to be embedded.

[0015] By adopting the above technical solution, the positioning strip is embedded in the positioning groove to achieve initial fixation between two adjacent cabinets, which facilitates subsequent fixation between the two adjacent cabinets through the fixing mechanism.

[0016] Preferably, it further includes a heat dissipation mechanism. The heat dissipation component includes a sliding plate, a first reset member, and a thermal expansion block. The sliding plate is slidably connected to the receiving cavity. A plurality of first heat dissipation holes are evenly distributed on the cavity wall. The sliding plate is evenly distributed with a plurality of first vent holes and second vent holes. The first vent holes and second vent holes are used to communicate with the first heat dissipation holes. The diameter of the first vent hole is equal to the diameter of the first heat dissipation hole, and the diameter of the second vent hole is smaller than the diameter of the first heat dissipation hole. The first reset member is connected between the sliding plate and the cabinet. The first reset member causes the sliding plate to tend to communicate with the first heat dissipation holes. The thermal expansion block is connected to the cabinet and is used to drive the sliding plate to slide.

[0017] By adopting the above technical solution, the hot air in the cavity is discharged through the first heat dissipation hole and the second air passage hole. When the heat dissipation efficiency of the first heat dissipation hole and the second air passage hole is insufficient, the heated expansion block expands due to heat, pushing the sliding plate to slide, so that the first air passage hole and the first heat dissipation hole are aligned, thereby improving the heat dissipation efficiency of the switch cabinet.

[0018] Preferably, the heat dissipation mechanism further includes a cooling fan, which is connected to the outside of the cabinet and communicates with the first heat dissipation hole. The cooling fan is used to draw air out of the accommodating cavity to the outside of the cabinet.

[0019] By adopting the above technical solution and installing a cooling fan, the hot air inside the housing cavity is drawn out, increasing the airflow rate inside the housing cavity, which helps to allow cooler outside air to enter, thereby improving the heat dissipation efficiency of the switch cabinet.

[0020] Preferably, the heat dissipation mechanism further includes a contact switch, which is embedded in the receiving cavity, electrically connected to the heat dissipation fan, used for the sliding plate to abut, and controls the opening and closing of the heat dissipation fan.

[0021] By adopting the above technical solution, when the temperature inside the cavity is too high, the first vent hole connects with the first heat dissipation hole, the contact plate contacts the contact switch, and the cooling fan is turned on, which automatically improves the heat dissipation efficiency of the switch cabinet, reduces the possibility of equipment inside the switch cabinet being damaged due to excessive temperature, and increases the service life of the switch cabinet.

[0022] Preferably, the heat dissipation mechanism further includes a fixing component, which includes a transmission block, a slider, and a fourth reset member. The side of the sliding plate away from the receiving cavity is provided with a receiving groove. The slider is slidably embedded in the receiving groove, and the sliding direction of the slider is perpendicular to the sliding direction of the sliding plate. The fourth reset member is connected between the slider and the sliding plate, and the fourth reset member makes the slider tend to extend out of the receiving groove. The transmission block is slidably connected to the cabinet, and the sliding direction of the transmission block is perpendicular to the sliding direction of the slider. The end of the transmission block near the sliding plate abuts against the end of the slider away from the bottom of the receiving groove. The end of the transmission block away from the sliding plate is provided with a second chamfer, which is located on the side of the transmission block away from the bottom of the positioning groove. The second chamfer is used for the positioning strip to abut against.

[0023] By adopting the above technical solution, during transportation, the slider extends out of the receiving groove and abuts against the cabinet, realizing the relative fixation between the sliding plate and the cabinet, reducing the possibility of the sliding plate sliding randomly and being damaged during transportation, and improving the service life of the switch cabinet; when the positioning strip is embedded in the positioning groove, the positioning strip abuts against the second chamfer, causing the transmission block to move towards the sliding plate, driving the slider to embed into the receiving groove, realizing the unlocking between the sliding plate and the cabinet, so that the sliding plate can slide according to the temperature change in the receiving cavity.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. The switch cabinet is constructed by assembling three cabinets vertically, which facilitates the handling and installation of the switch cabinet; the fixing mechanism enables the first connecting block and the second connecting block on two adjacent cabinets to be fixed together, thereby fixing the two adjacent cabinets together, simplifying the assembly process of the switch cabinet and improving work efficiency.

[0026] 2. By rotating the worm gear, the worm wheel rotates, causing the fixed block to slide, so that the fixed block is embedded in the first limit hole and the second limit hole, thereby fixing the first connecting block and the second connecting block, and thus fixing the two adjacent cabinets. The worm wheel and worm gear have a self-locking feature, which reduces the possibility of the fixed block being dislodged from the first limit hole and the second limit hole due to vibration, allowing relative movement between the two adjacent cabinets and improving the reliability of the switch cabinet.

[0027] 3. When the temperature inside the cavity is too high, the first vent hole connects with the first heat dissipation hole, and the contact plate contacts the contact switch to turn on the cooling fan. This automatically improves the heat dissipation efficiency of the switch cabinet, reduces the possibility of damage to the equipment inside the switch cabinet due to excessive temperature, and extends the service life of the switch cabinet. Attached Figure Description

[0028] Figure 1 This is a structural schematic diagram of a low-voltage fixed switchgear.

[0029] Figure 2 This is a sectional view of a low-voltage fixed switchgear.

[0030] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0031] Figure 4 This is a sectional view of a low-voltage fixed switchgear.

[0032] Figure 5 yes Figure 4 Enlarged view of point B in the middle.

[0033] Figure 6 This is a structural schematic diagram of a low-voltage fixed switchgear.

[0034] Figure 7 This is a partial sectional view of a low-voltage fixed switchgear.

[0035] Figure 8 It is a partial sectional view of the cabinet and fixing mechanism.

[0036] Figure 9 This is a partial sectional view of a low-voltage fixed switchgear.

[0037] Figure 10 yes Figure 9 Enlarged view of point C in the middle.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Switch cabinet; 11. Cabinet body; 111. Receiving cavity; 112. First connecting block; 1121. First limiting hole; 1122. Limiting groove; 113. Second connecting block; 1131. Second limiting hole; 114. Positioning strip; 115. Positioning groove; 116. First heat dissipation hole; 117. Mounting groove; 118. Rotating seat; 1181. Rotating groove; 119. Second heat dissipation hole; 1110. Third sliding groove; 1111. Guide column; 1112. Connecting cavity; 1113. Support seat; 12. Cabinet door; 121. Clearance groove; 122. Fixing groove; 123. Adjustment groove; 13. Protective cover; 131. Mounting cavity; 132. First sliding groove; 14. Door handle; 15. Rotating shaft; 151. Rounded corner; 152. Adjusting block; 16. Fifth reset component;

[0040] 2. Fixing mechanism; 21. Worm gear; 211. Abutment bar; 212. Second slide groove; 22. Worm wheel; 23. Lead screw; 24. Fixing block; 241. Sliding seat; 242. Limiting rod; 25. Handle; 251. Connecting ring; 2511. Abutment groove; 2512. Embedded groove; 2513. Communicating hole; 252. Adjusting rod; 253. Abutment ring; 26. Pressing block; 261. First chamfer; 262. First positioning block; 27. Second reset component; 28. Fixing component; 281. Embedded block; 282. Third reset component; 29. ​​Pad block;

[0041] 3. Heat dissipation mechanism; 31. Sliding plate; 311. First vent; 312. Second vent; 313. Receiving groove; 314. Guide hole; 32. First reset component; 33. Thermal expansion block; 331. Through hole; 34. Cooling fan; 35. Contact switch; 36. Fixing component; 361. Transmission block; 3611. Connecting section; 3612. Pushing section; 3613. Abutting section; 36131. ​​Second chamfer; 362. Slider; 363. Fourth reset component. Detailed Implementation

[0042] The present application will be further described in detail below with reference to the accompanying drawings.

[0043] Reference Figure 1 This application discloses a low-voltage fixed switchgear including a switchgear 1. The switchgear 1 includes a cabinet body 11 and cabinet doors 12. There are three cabinet bodies 11, which are arranged vertically in sequence. One side of each cabinet body 11 along its width direction has a receiving cavity 111, and the receiving cavities 111 of the three cabinet bodies 11 are connected. The number of cabinet doors 12 is the same as the number of cabinet bodies 11 and corresponds one-to-one. The cabinet doors 12 are rotatably connected to the cabinet bodies 11 and cover the opening of the receiving cavity 111. The rotation axis of the cabinet doors 12 is vertical. A mounting groove 117 is provided on the cavity wall of the cabinet body 11 on the side away from the bottom of the receiving cavity 111, and the mounting groove 117 is used for embedding the cabinet doors 12.

[0044] Reference Figure 1 and Figure 2 A door handle 14 is fixedly connected to the side of the cabinet door 12 away from the receiving cavity 111 to facilitate opening the cabinet door 12. A rotating seat 118 is fixedly connected to the groove wall of the mounting groove 117 near the rotation axis of the cabinet door 12. A clearance groove 121 is provided on the side of the cabinet door 12 near the rotating seat 118, which is used for the rotating seat 118 to rotate and fit into. The rotation axis of the rotating seat 118 coincides with the rotation axis of the cabinet door 12. One cabinet door 12 corresponds to two rotating seats 118, which are located on both sides of the cabinet door 12 along the vertical direction. The number of clearance grooves 121 is the same as the number of rotating seats 118 and they correspond one-to-one.

[0045] Reference Figure 2 and Figure 3 The switch cabinet 1 also includes a rotating shaft 15 and a fifth reset member 16. The number of rotating shafts 15 and fifth reset members 16 is the same as the number of rotating seats 118 and they correspond one-to-one. The cabinet door 12 has fixing grooves 122 on both sides along the vertical direction, and the axis of the fixing grooves 122 coincides with the rotation axis of the cabinet door 12. The rotating shaft 15 is slidably embedded in the fixing groove 122, and the sliding direction of the rotating shaft 15 is parallel to the axis of the fixing groove 122. The rotating seat 118 has a rotating groove 1181 on the side near the cabinet door 12, and the axis of the rotating groove 1181 coincides with the axis of the fixing groove 122. The rotating groove 1181 is used for the rotating shaft 15 to be embedded in, and the end of the rotating shaft 15 away from the bottom of the fixing groove 122 has a rounded corner 151. The fifth reset member 16 connects the rotating shaft 15 and the cabinet door 12, and the fifth reset member 16 makes the rotating shaft 15 tend to extend out of the fixing groove 122. In this embodiment, the fifth reset member 16 is a spring. One end of the fifth reset member 16 is connected to the end of the rotating shaft 15 near the bottom of the fixed groove 122, and the other end of the fifth reset member 16 is connected to the bottom of the fixed groove 122. An adjustment groove 123 is provided on the side of the fixed groove 122 away from the receiving groove 313. The adjustment groove 123 is connected to the outside. An adjustment block 152 is fixedly connected to the outer wall of the rotating shaft 15 near the bottom of the fixed groove 122. The adjustment block 152 is slidably embedded in the adjustment groove 123, and the sliding direction of the adjustment block 152 is parallel to the sliding direction of the rotating shaft 15.

[0046] Reference Figure 4 and Figure 5 The upper ends of the middle and lower cabinets 11 are fixedly connected with positioning strips 114, and the lower ends of the upper and middle cabinets 11 are provided with positioning grooves 115, which are used for the positioning strips 114 of adjacent cabinets 11 to be embedded.

[0047] Reference Figure 1 and Figure 6A low-voltage fixed switchgear also includes a heat dissipation mechanism 3. Two heat dissipation mechanisms 3 are provided, each embedded in a receiving cavity 111 of the middle and lower cabinet bodies 11, respectively. A plurality of first heat dissipation holes 116 are evenly distributed on the side of the receiving cavity 111 of the upper and middle cabinet bodies 11 near the rotating seat 118. Second heat dissipation holes 119 are evenly distributed on the other side wall of the receiving cavity 111 of the upper and middle cabinet bodies 11, the diameter of the second heat dissipation holes 119 being smaller than the diameter of the first heat dissipation holes 116. Second heat dissipation holes 119 are evenly distributed on both sides of the receiving cavity 111 of the lower cabinet body 11 along the length of the cabinet body 11.

[0048] The heat dissipation mechanism 3 includes a sliding plate 31. A third sliding groove 1110 is provided on the cavity wall of the receiving groove 313, and the third sliding groove 1110 communicates with the first heat dissipation hole 116. The sliding plate 31 is slidably embedded in the third sliding groove 1110, and the sliding direction of the sliding plate 31 is vertical. The sliding plate 31 has evenly distributed first vent holes 311 and second vent holes 312, which communicate with the first heat dissipation hole 116. The diameter of the first vent hole 311 is equal to the diameter of the first heat dissipation hole 116, and the diameter of the second vent hole 312 is equal to the diameter of the second heat dissipation hole 119.

[0049] Reference Figure 1 and Figure 7 A guide post 1111 is fixedly connected within the third slide groove 1110. The axis of the guide post 1111 is vertical, and there are two guide posts 1111, which are symmetrically distributed along the width of the cabinet 11. The sliding plate 31 is provided with guide holes 314, the number of which is the same as the number of guide posts 1111 and they correspond one-to-one. The guide holes 314 are used for the guide posts 1111 to slide into the sliding plate 31, and the sliding direction of the guide posts 1111 is parallel to the sliding direction of the sliding plate 31.

[0050] Reference Figure 6 and Figure 7The heat dissipation mechanism 3 also includes a thermal expansion block 33, a first reset member 32, a cooling fan 34, and a contact switch 35. The cooling fan 34 is fixedly connected to the outside of the cabinet 11 and communicates with the first heat dissipation hole 116. The cooling fan 34 is used to draw air out of the accommodating cavity 111 from the outside of the cabinet 11. The thermal expansion block 33 is fixedly connected to the upper wall of the third slide groove 1110. The lower end of the thermal expansion block 33 abuts against the upper end of the sliding plate 31, and the thermal expansion block 33 is used to drive the sliding plate 31 to slide. The contact switch 35 is fixedly connected to the lower wall of the third slide groove 1110 and is electrically connected to the cooling fan 34. The contact switch 35 is used to allow the sliding plate 31 to abut against the fan to control the opening and closing of the cooling fan 34. The thermal expansion block 33 has through holes 331, the number of which is the same as the number of guide posts 1111 and corresponds one-to-one. The first reset member 32 is embedded in the through hole 331 and sleeved on the outer periphery of the guide post 1111. The first reset member 32 is connected between the cabinet 11 and the sliding plate 31. The first reset member 32 causes the sliding plate 31 to tend to move away from the contact switch 35, and causes the second vent hole 312 to tend to communicate with the first heat dissipation hole 116. In this embodiment, the first reset member 32 is a spring. One end of the first reset member 32 is connected to the upper end of the sliding plate 31, and the other end of the first reset member 32 is connected to the upper groove wall of the third slide groove 1110.

[0051] Reference Figure 5The heat dissipation mechanism 3 also includes fixing components 36. The sliding plate 31 has two receiving slots 313 on the side facing the bottom of the third sliding groove 1110. These two receiving slots 313 are symmetrically distributed along the width direction of the cabinet 11. The number of fixing components 36 is the same as the number of receiving slots 313 and corresponds one-to-one. The fixing components 36 include a transmission block 361, a slider 362, and a fourth reset member 363. The slider 362 is slidably embedded in the receiving slot 313, and the sliding direction is parallel to the length direction of the cabinet 11. The fourth reset member 363 connects the sliding plate 31 and the slider 362, causing the slider 362 to tend to extend out of the receiving slot 313. In this embodiment, the fourth reset member 363 is a spring. One end of the fourth reset member 363 is connected to the end of the slider 362 near the bottom of the receiving slot 313, and the other end of the fourth reset member 363 is connected to the bottom of the receiving slot 313. The bottom of the third chute 1110 has a connecting cavity 1112, and the transmission block 361 is slidably embedded in the connecting cavity 1112. The sliding direction of the transmission block 361 is parallel to the sliding direction of the slider 362. The transmission block 361 includes a connecting section 3611, an abutting section 3613, and a pushing section 3612. The connecting section 3611 is slidably embedded in the connecting cavity 1112, and the sliding direction of the connecting section 3611 is parallel to the sliding direction of the slider 362. One end of the pushing section 3612 is fixedly connected to the side of the connecting section 3611 near the sliding plate 31, and the other end of the pushing section 3612 is used to abut against the end of the slider 362 away from the bottom of the receiving groove 313. One end of the abutment section 3613 is fixedly connected to the other side of the connecting section 3611. The end of the abutment section 3613 away from the connecting section 3611 extends into the positioning groove 115. The end of the abutment section 3613 away from the connecting section 3611 is provided with a second chamfer 36131, which is located at the lower end of the abutment section 3613 and is used for the positioning strip 114 to abut against. When the positioning strip 114 is embedded in the positioning groove 115, the surface of the slider 362 away from the bottom of the receiving groove 313 is flush with the surface of the sliding plate 31 facing the third sliding groove 1110.

[0052] Reference Figure 6 and Figure 8A low-voltage fixed switchgear also includes a fixing mechanism 2. Two fixing mechanisms 2 are provided, respectively connected to the middle and lower cabinet bodies 11 on the side away from the cabinet door 12, and used to fix adjacent cabinet doors 12 together. A first connecting block 112 is fixedly connected to the side of the upper and middle cabinet bodies 11 away from the cabinet door 12. The first connecting block 112 is located on the side of the cabinet body 11 near the lower end, with two first connecting blocks 112 corresponding to one cabinet body 11, and the two first connecting blocks 112 are symmetrically distributed along the length of the cabinet body 11. A second connecting block 113 is fixedly connected to the side of the middle and lower cabinet bodies 11 away from the cabinet door 12. The second connecting block 113 is located on the side of the cabinet body 11 near the upper end, and the number of second connecting blocks 113 is the same as the number of first connecting blocks 112, and they correspond one-to-one. A limiting groove 1122 is provided at the lower end of the first connecting block 112, which is used for the second connecting block 113 of adjacent cabinet bodies 11 to be inserted.

[0053] The switch cabinet 1 also includes a protective cover 13, which is fixedly connected to the side of the cabinet body 11 away from the cabinet door 12. The number of protective covers 13 is the same as the number of fixing mechanisms 2 and they correspond one-to-one. The fixing mechanism 2 also includes a worm gear 21, a worm wheel 22, a lead screw 23, and a fixing block 24. The protective cover 13 has a mounting cavity 131 on the side near the cabinet body 11. The worm gear 21 is rotatably embedded in the mounting cavity 131, and the rotation axis of the worm gear 21 is parallel to the width direction of the cabinet body 11. The worm wheel 22 is rotatably embedded in the mounting cavity 131, and the rotation axis of the worm wheel 22 is parallel to the length direction of the cabinet body 11. The worm wheel 22 meshes with the worm gear 21. The lead screw 23 is coaxially fixedly connected to the worm wheel 22. Both ends of the lead screw 23 extend out of the protective cover 13 in the axial direction. A support base 1113 is fixedly connected to the side of the cabinet body 11 near the protective cover 13. There are two support bases 1113, which are symmetrically distributed along the axial direction of the lead screw 23. Both ends of the lead screw 23 are rotatably connected to the support base 1113. The first connecting block 112 is provided with a first limiting hole 1121, the axis of which is parallel to the axis of the lead screw 23. The second connecting block 113 is provided with a second limiting hole 1131. When the second connecting block 113 is embedded in the limiting groove 1122, the axis of the second limiting hole 1131 coincides with the axis of the first limiting hole 1121. The fixing block 24 is slidably connected to the cabinet 11, and the sliding direction of the fixing block 24 is parallel to the axis of the lead screw 23. The number of fixing blocks 24 is the same as the number of second connecting blocks 113 and they correspond one-to-one. The fixing blocks 24 are used to be embedded in the first limiting hole 1121 and the second limiting hole 1131 to achieve fixation between two adjacent cabinets 11. The fixing block 24 includes a sliding seat 241 and a limiting rod 242. The sliding seat 241 is slidably connected to the cabinet 11, and the sliding direction of the sliding seat 241 is parallel to the axial direction of the lead screw 23. The sliding seat 241 is threadedly connected to the lead screw 23. In this embodiment, the threaded sections of the lead screw 23 on both sides of the worm gear 22 have opposite directions of rotation. One end of the limiting rod 242 is fixedly connected to the side of the sliding seat 241 away from the protective cover 13, and the limiting rod 242 is used to be embedded in the first limiting hole 1121 and the second limiting hole 1131.

[0054] Reference Figure 9 and Figure 10The fixing mechanism 2 also includes a clamping block 26, a second reset member 27, and a pad 29. Two clamping blocks 26 are provided, evenly distributed circumferentially around the axis of the worm gear 21. The number of second reset members 27 and pads 29 is the same as the number of clamping blocks 26 and they correspond one-to-one. The end of the worm gear 21 away from the cabinet 11 extends out of the protective cover 13. The clamping block 26 is slidably embedded in the side of the protective cover 13 away from the cabinet 11, with the sliding direction of the clamping block 26 parallel to the radial direction of the worm gear 21. The pad 29 is fixedly connected to the inner side of the clamping block 26, and the inner wall of the pad 29 is used to clamp the outer wall of the worm gear 21. A first sliding groove 132 is provided on the side of the protective cover 13 away from the cabinet 11. A first positioning block 262 is fixedly connected to the end of the clamping block 26 near the protective cover 13, with the first positioning block 262 slidably embedded in the first sliding groove 132, and the sliding direction of the first positioning block 262 parallel to the sliding direction of the clamping block 26. The second reset member 27 connects the abutment block 26 and the protective cover 13, and the second reset member 27 causes the abutment block 26 to tend to abut against the worm gear 22. In this embodiment, the second reset member 27 is a spring. One end of the second reset member 27 is connected to the surface of the first positioning block 262 away from the worm 21, and the other end of the second reset member 27 is connected to the groove wall of the first slide groove 132 away from the worm 21.

[0055] The fixing mechanism 2 also includes a handle 25. The handle 25 includes a connecting ring 251 and an adjusting rod 252. The connecting ring 251 is slidably connected to the outer periphery of the worm gear 21, and the sliding direction of the connecting ring 251 is parallel to the axial direction of the lead screw 23. One end of the adjusting rod 252 is fixedly connected to the outer periphery of the connecting ring 251. An abutment ring 253 is coaxially connected to the side of the connecting ring 251 near the protective cover 13. A first chamfer 261 is provided on the side of the abutment block 26 away from the protective cover 13. The first chamfer 261 is located inside the abutment block 26 and is used for the abutment ring 253 to abut against. An abutment strip 211 is connected to the outer periphery of the end of the worm gear 21 away from the cabinet 11. The abutment strip 211 extends along the axial direction of the worm gear 21. The connecting ring 251 has an abutment groove 2511 on its inner side, and the abutment strip 211 is slidably embedded in the abutment groove 2511. The sliding direction of the abutment strip 211 is parallel to the axis of the worm 21. The side wall of the abutment strip 211 is in contact with the groove wall of the abutment groove 2511.

[0056] The fixing mechanism 2 also includes a fixing member 28, which includes an insert 281 and a third reset member 282. A second groove 212 is provided on the side of the abutment bar 211 away from the worm 21. The insert 281 is slidably embedded in the second groove 212, and the sliding direction of the insert 281 is parallel to the radial direction of the worm 21. The third reset member 282 connects the insert 281 and the worm 21, and the third reset member 282 causes the insert 281 to tend to extend out of the second groove 212. In this embodiment, the third reset member 282 is a spring, with one end connected to the end of the insert 281 near the bottom of the second groove 212, and the other end connected to the bottom of the second groove 212. The bottom of the abutment groove 2511 is provided with a groove 2512 for inserting the insert 281. The groove 2512 is provided with a connecting hole 2513 on the side wall away from the worm 21. The connecting hole 2513 is connected to the outside and is used for an external push rod to insert into the abutment insert 281 so that the insert 281 is disengaged from the groove 2512.

[0057] The implementation principle of a low-voltage fixed switchgear according to an embodiment of this application is as follows: During transportation, the slider 362 extends out of the receiving groove 313 and is embedded in the connecting cavity 1112, thereby fixing the sliding plate 31 and the cabinet 11 relatively and reducing the possibility of collision between the sliding plate 31 and the cabinet door 12 during transportation.

[0058] During installation, the middle cabinet 11 is installed above the lower cabinet 11. When the positioning strip 114 is embedded in the positioning groove 115, the positioning strip 114 abuts against the second chamfer 36131, pushing the transmission block 361 to slide, causing the slider 362 to slide, so that the slider 362 is embedded in the receiving groove 313, thereby unlocking the sliding plate 31 and the cabinet 11. The handle 25 is sleeved on the outer circumference of the worm 21 along the axis of the worm 21. The abutment strip 211 and the abutment groove 2511 fix the handle 25 and the worm 21 circumferentially. The abutment ring 253 abuts against the first chamfer 261, pushing the clamping block 26 to move away from the worm 21, causing the pad block 29 to disengage from the worm 21. When the insert block 281 is embedded in the insert groove 2512, the handle 25 and the worm 21 are axially fixed. Rotating handle 25 causes worm gear 21 to rotate, which in turn rotates worm wheel 22, leading screw 23 to rotate. This causes fixing block 24 to slide, allowing limiting rod 242 to engage with the first limiting hole 1121 and the second limiting hole 1131, thus securing the first connecting block 112 and the second connecting block 113, and consequently securing the middle and lower cabinet 11. A push rod passes through connecting hole 2513 and abuts against insert 281, disengaging insert 281 from groove 2512 and unlocking handle 25 and worm gear 21. Repeating this process completes the installation between the middle and upper cabinet 11.

[0059] During use, the air inside the housing 111 is cooled through the second vent 312, the first heat dissipation hole 116, and the second heat dissipation hole 119. When the temperature inside the housing 111 rises, the thermal expansion block 33 expands due to heat, pushing the sliding plate 31 to slide, so that the first vent 311 connects with the first heat dissipation hole 116 and abuts against the contact switch 35, controlling the cooling fan 34 to turn on, expelling the hot air inside the housing 111 to the outside of the cabinet 11, thereby cooling the housing 111.

[0060] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A low-voltage fixed switchgear, characterized in that: The system includes a cabinet (11), a cabinet door (12), and a fixing mechanism (2); there are three cabinets (11); the three cabinets (11) are arranged in sequence along the vertical direction; each cabinet (11) has a receiving cavity (111); the cabinet door (12) is rotatably connected to the cabinet (11) and covers the opening of the receiving cavity (111); the middle and lower cabinets (11) are connected to a first connecting block (112) on the side away from the cabinet door (12); the upper and middle cabinets (11) are connected to a second connecting block (113) on the side away from the cabinet door (12); the fixing mechanism (2) is connected to the middle and lower cabinets (11); the fixing mechanism (2) is used to fix the first connecting block (112) and the second connecting block (113) to achieve fixation between two adjacent cabinets (11); The upper end of the middle and lower cabinet (11) is connected with a positioning strip (114); the lower end of the middle and upper cabinet (11) is provided with a positioning groove (115); the positioning groove (115) is used for the positioning strip (114) to be embedded; It also includes a heat dissipation mechanism (3); the heat dissipation mechanism (3) includes a sliding plate (31), a first reset member (32), and a thermal expansion block (33); the sliding plate (31) is slidably connected to the receiving cavity (111); a plurality of first heat dissipation holes (116) are evenly distributed on the cavity wall of the receiving cavity (111); the sliding plate (31) is evenly distributed with a plurality of first vent holes (311) and second vent holes (312); the first vent holes (311) and second vent holes (312) are used to communicate with the first heat dissipation holes (116); the first vent holes (311) and second vent holes (312) are evenly distributed on the sliding plate (31 ... The diameter of the first vent (311) is equal to the diameter of the first heat dissipation hole (116); the diameter of the second vent (312) is smaller than the diameter of the first heat dissipation hole (116); the first reset member (32) is connected between the sliding plate (31) and the cabinet (11); the first reset member (32) makes the sliding plate (31) tend to connect the second vent (312) with the first heat dissipation hole (116); the heated expansion block (33) is connected to the cabinet (11); the heated expansion block (33) is used to drive the sliding plate (31) to slide; The heat dissipation mechanism (3) further includes a fixing component (36); the fixing component (36) includes a transmission block (361), a slider (362), and a fourth reset component (363); the sliding plate (31) has a receiving groove (313) on the side away from the receiving cavity (111); the slider (362) is slidably embedded in the receiving groove (313); the sliding direction of the slider (362) is perpendicular to the sliding direction of the sliding plate (31); the fourth reset component (363) is connected between the slider (362) and the sliding plate (31); the fourth reset component (363) enables the slider (362) to extend out of the receiving groove (311). The trend of 13); the transmission block (361) is slidably connected to the cabinet (11); the sliding direction of the transmission block (361) is perpendicular to the sliding direction of the slider (362); the end of the transmission block (361) near the sliding plate (31) abuts against the end of the slider (362) away from the bottom of the receiving groove (313); the end of the transmission block (361) away from the sliding plate (31) is provided with a second chamfer (36131); the second chamfer (36131) is located on the side of the transmission block (361) away from the bottom of the positioning groove (115); the second chamfer (36131) is used for the positioning strip (114) to abut.

2. The low-voltage fixed switchgear according to claim 1, characterized in that: The fixing mechanism (2) includes a worm (21), a worm wheel (22), a lead screw (23), and a fixing block (24); the worm wheel (22) is rotatably connected to the cabinet (11); the worm wheel (22) is rotatably connected to the cabinet (11); the worm wheel (22) meshes with the worm (21); the lead screw (23) is coaxially fixedly connected to the worm wheel (22); the fixing block (24) is slidably connected to the cabinet (11); the sliding direction of the fixing block (24) is parallel to the axial direction of the lead screw (23); the fixing block (24) is threadedly connected to the lead screw (23); the first connecting block (112) is provided with a first limiting hole (1121); the second connecting block (113) is provided with a second limiting hole (1131); the fixing block (24) is embedded in the first limiting hole (1121) and the second limiting hole (1131) to achieve fixing between two adjacent cabinets (11).

3. The low-voltage fixed switchgear according to claim 2, characterized in that: It also includes a protective cover (13); the protective cover (13) is connected to the cabinet (11); the protective cover (13) has a mounting cavity (131); the worm gear (22) and the worm (21) are embedded in the mounting cavity (131); the end of the lead screw (23) away from the cabinet (11) extends out of the protective cover (13); the fixing mechanism (2) also includes a handle (25), a clamping block (26), a second reset member (27) and a fixing member (28); the clamping block (26) is slidably connected to the protective cover (13); the sliding direction of the clamping block (26) is parallel to the radial direction of the worm (21); the second reset member (27) is connected between the clamping block (26) and the protective cover (13); the second reset member (27) causes the clamping block (26) to slide in a direction that ... 26) It tends to abut against the outer wall of the worm (21); the handle (25) is slidably connected to the worm (21); the sliding direction of the handle (25) is parallel to the axial direction of the worm (21); the abutting block (26) is provided with a first chamfer (261) on the side away from the cabinet (11); the first chamfer (261) is located on the side of the abutting block (26) close to the worm (21); the first chamfer (261) is used for the handle (25) to abut against; the fixing member (28) is connected to the worm (21); the fixing member (28) is used to realize the relative fixation of the handle (25) and the worm (21) along the axial direction.

4. The low-voltage fixed switchgear according to claim 3, characterized in that: The fixing member (28) includes an insert (281) and a third reset member (282); the insert (281) is slidably connected to the worm (21); the sliding direction of the insert (281) is parallel to the radial direction of the worm (21); the handle (25) has a groove (2512) on its inner circumference; the groove (2512) is used for the insert (281) to be inserted; the third reset member (282) is connected between the insert (281) and the worm (21); the third reset member (282) makes the insert (281) tend to be inserted into the groove (2512); the bottom of the groove (2512) has a connecting hole (2513); the connecting hole (2513) connects the groove (2512) to the outside.

5. The low-voltage fixed switchgear according to claim 1, characterized in that: The heat dissipation mechanism (3) also includes a heat dissipation fan (34); the heat dissipation fan (34) is connected to the outside of the cabinet (11); the heat dissipation fan (34) is connected to the first heat dissipation hole (116); the heat dissipation fan (34) is used to draw the air in the accommodating cavity (111) out to the outside of the cabinet (11).

6. The low-voltage fixed switchgear according to claim 5, characterized in that: The heat dissipation mechanism (3) also includes a contact switch (35); the contact switch (35) is embedded in the receiving cavity (111); the contact switch (35) is electrically connected to the cooling fan (34); the contact switch (35) is used for the sliding plate (31) to abut; the contact switch (35) controls the opening and closing of the cooling fan (34).

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