阅读说明：本技术 一种具有加热功能的sf6负荷开关 (SF6 load switch with heating function ) 是由 陈登鹏 许耀林 陈翰 吴庆煌 于 2020-12-29 设计创作，主要内容包括：本申请涉及一种具有加热功能的SF6负荷开关,其包括开关本体和安装板,所述开关本体底部间隔设置有三个下端子,所述安装板上沿长度方向间隔开设有三个与下端子适配的安装孔,所述安装板内设置有用于将下端子固定在安装孔内的固定组件；所述安装板内沿长度方向开设有安装槽,所述安装槽一端与安装板外侧连通,所述安装槽内设置有加热管,所述安装槽与三个安装孔连通,所述加热管紧贴在三个下端子的侧壁上；所述开关本体上设置有温度传感器,当所述温度传感器检测到预设的下限温度值时,所述加热管开始加热,当所述温度传感器检测到预设的上限温度值时,所述加热管停止加热。本申请具有自动对开关本体进行加热从而预防SF6气体液化的效果。(The application relates to an SF6 load switch with a heating function, which comprises a switch body and a mounting plate, wherein three lower terminals are arranged at the bottom of the switch body at intervals, three mounting holes matched with the lower terminals are formed in the mounting plate at intervals along the length direction, and a fixing component used for fixing the lower terminals in the mounting holes is arranged in the mounting plate; an installation groove is formed in the installation plate along the length direction, one end of the installation groove is communicated with the outer side of the installation plate, a heating pipe is arranged in the installation groove, the installation groove is communicated with the three installation holes, and the heating pipe is tightly attached to the side walls of the three lower terminals; the switch is characterized in that a temperature sensor is arranged on the switch body, when the temperature sensor detects a preset lower limit temperature value, the heating pipe starts to heat, and when the temperature sensor detects a preset upper limit temperature value, the heating pipe stops heating. The gas liquefaction effect of thereby preventing SF6 is heated to the switch body automatically to this application.)

1. An SF6 load switch with heating function, characterized by: the switch comprises a switch body (1) and a mounting plate (3), wherein three lower terminals (4) are arranged at the bottom of the switch body (1) at intervals, three mounting holes (5) matched with the lower terminals (4) are formed in the mounting plate (3) at intervals along the length direction, and fixing assemblies for fixing the lower terminals (4) in the mounting holes (5) are arranged in the mounting plate (3);

a mounting groove (12) is formed in the mounting plate (3) along the length direction, one end of the mounting groove (12) is communicated with the outer side of the mounting plate (3), a heating pipe (13) is arranged in the mounting groove (12), the mounting groove (12) is communicated with the three mounting holes (5), and the heating pipe (13) is tightly attached to the side walls of the three lower terminals (4);

be provided with temperature sensor (14) on switch body (1), when temperature sensor (14) detect predetermined lower limit temperature value, heating pipe (13) begin to heat, when temperature sensor (14) detect predetermined upper limit temperature value, heating pipe (13) stop heating.

2. The SF6 load switch with heating function of claim 1, wherein: the fixing assembly comprises a clamping block (6), a circular ring (7) and a torsion spring (8), the clamping block (6) is arranged on the side wall of the lower terminal (4), the circular ring (7) is rotatably connected to the side wall of the upper end part of the mounting hole (5), a first annular groove (9) is formed between the upper surface and the lower surface of the circular ring (7), and the first annular groove (9) is communicated with the mounting hole (5);

ring (7) upper surface is seted up downwards draw-in groove (10) with fixture block (6) adaptation, draw-in groove (10) and fixture block (6) dislocation set, draw-in groove (10) and first ring channel (9) and mounting hole (5) intercommunication are located set up second ring channel (11) in mounting panel (3) of ring (7) below, torsional spring (8) set up in second ring channel (11), torsional spring (8) one end is connected on ring (7), and the other end is connected in mounting panel (3), fixture block (6) are inlayed in first ring channel (9) through draw-in groove (10).

3. The SF6 load switch with heating function of claim 2, wherein: and a rotating block (15) is arranged on the upper surface of the circular ring (7).

4. The SF6 load switch with heating function of claim 2, wherein: the heating pipe (13) is provided with two lower terminals (4) which are symmetrically arranged below the second annular groove (11).

5. The SF6 load switch with heating function of claim 1, wherein: and the outer side wall of the lower terminal (4) is provided with a heat conduction layer (16).

6. The SF6 load switch with heating function of claim 1, wherein: and the outer surface of the mounting plate (3) is provided with a heat-insulating layer (17).

7. The SF6 load switch with heating function of claim 1, wherein: the automatic switch is characterized by further comprising an operating mechanism (2), wherein the operating mechanism (2) is arranged on the side wall of one side of the switch body (1), a pressure gauge (18) used for detecting air pressure inside the switch body (1) is arranged on the operating mechanism (2), and a manual closing button (19) and a manual opening button (20) are arranged on the operating mechanism (2);

be provided with in operating device (2) with manometer (18) complex control circuit (21), SF6 load switch's electronic combined floodgate and separating brake can be controlled in control circuit (21), work as when manometer (18) detect the low pressure, control circuit (21) response is prohibited manual combined floodgate button (19) and manual separating brake button (20) and is pressed, and SF6 load switch can't realize electronic combined floodgate and separating brake.

8. The SF6 load switch with heating function of claim 7, wherein: the control circuit (21) comprises a switch control loop (22), and the switch control loop (22) comprises a first control small bus (KMa), an electric closing button (SBC), an electric opening button (SBS), a travel switch (S1), a motor (M), a low-voltage alarm switch, an automatic switch (S2), a locking electromagnet (Y1) and a second control small bus (KMc);

the locking electromagnet (Y1) is arranged at an operation hole of a closing button and an opening button, the output end of the first control small bus (KMa) is sequentially connected with an electric closing button (SBC), a stroke switch (S1), a motor (M) and a second control small bus (KMc) in series, the electric opening button (SBS) is connected to two ends of the electric closing button (SBC) in parallel, and the low-voltage alarm switch normally-closed contact (SB1), an automatic switch (S2) and the locking electromagnet (Y1) are sequentially connected to two ends of the electric closing button (SBC) and the motor (M) in parallel;

when manometer (18) detect the low pressure, low pressure alarm switch normally closed contact (SB1) disconnection, shutting electromagnet (Y1) loses the electricity, travel switch (S1) disconnection, the handle hole of manual closing button (19) and manual separating brake button (20) is blockked up to the iron sheet of shutting electromagnet (Y1).

9. The SF6 load switch with heating function of claim 8, wherein: control circuit (21) still includes warning circuit (23), warning circuit (23) include bee calling organ (HA), low pressure alarm switch normally open contact (SB2) and bee calling organ (HA) connect in parallel in proper order at low pressure alarm switch normally closed contact (SB1) and shutting electro-magnet (Y1) both ends.

Technical Field

The application relates to the field of load switches, in particular to an SF6 load switch with a heating function.

Background

The SF6 load switch is a load switch using SF6 gas as an insulating and arc extinguishing medium, and has been widely used in recent years because of the advantage that the SF6 load switch easily realizes three operating positions.

At present, an SF6 gas insulated load switch in the related art generally comprises a switch body and an operating mechanism, wherein epoxy resin is injected on the outer layer of the switch body to serve as an insulating layer, the operating mechanism is arranged on one side of the switch body and is used for realizing three-station operation of the SF6 load switch, and three lower terminals for wiring are arranged at the bottom of the switch body. Through above-mentioned technical scheme, on the mounting panel of switch body fixed to the switch board, the lower terminal extends to the mounting panel below and is used for the wiring, and operating device extends the switch board outside again and makes into control panel to utilize control panel to realize the operation of three stations.

In view of the above-mentioned related technologies, the inventor believes that the currently used SF6 load switch has an inflation pressure of about 0.45Mpa at 20 ℃, and a corresponding liquefaction temperature of SF6 is-40 ℃, however, in some severe cold regions, the temperature often drops below-40 ℃, so that the defect that the SF6 gas is liquefied under low temperature conditions to cause the SF6 load switch to be arcing exists.

Disclosure of Invention

In order to prevent the liquefaction of SF6 gas, the application provides an SF6 load switch with heating function.

The SF6 load switch with the heating function adopts the following technical scheme:

an SF6 load switch with a heating function comprises a switch body and a mounting plate, wherein three lower terminals are arranged at the bottom of the switch body at intervals, three mounting holes matched with the lower terminals are formed in the mounting plate at intervals along the length direction, and fixing assemblies used for fixing the lower terminals in the mounting holes are arranged in the mounting plate;

an installation groove is formed in the installation plate along the length direction, one end of the installation groove is communicated with the outer side of the installation plate, a heating pipe is arranged in the installation groove, the installation groove is communicated with the three installation holes, and the heating pipe is tightly attached to the side walls of the three lower terminals;

the switch is characterized in that a temperature sensor is arranged on the switch body, when the temperature sensor detects a preset lower limit temperature value, the heating pipe starts to heat, and when the temperature sensor detects a preset upper limit temperature value, the heating pipe stops heating.

By adopting the technical scheme, when a worker installs the SF6 load switch, the three lower terminals of the switch body are inserted into the mounting holes firstly, the three lower terminals are fixed in the three mounting holes respectively through the fixing assemblies, the switch body is further fixed with the mounting plate, then the whole mounting plate and the switch body are fixed in the power distribution cabinet together, so that the position of a part inside the switch body in the installation process can be prevented from deviating, and by arranging the heating pipe and the temperature sensor, when the temperature of a use environment is lowered to a certain value, the temperature sensor senses and enables the heating pipe to start heating, the heat of the heating pipe is transferred to the lower terminals, the lower terminals transfer the heat to the metal shell of the whole switch body in an insulating heat conduction mode, so that the SF6 gas liquefaction caused by too low temperature in the switch body is avoided; after the heating pipe is used for heating, when the surface temperature of the switch body reaches a certain value, the temperature sensor senses and enables the heating pipe to stop heating, and damage to the switch body due to overhigh temperature is avoided.

Preferably, the fixed subassembly includes fixture block, ring and torsional spring, the fixture block sets up on the lateral wall of terminal down, the ring rotates to be connected on the lateral wall of mounting hole upper end, first ring channel has been seted up between the upper surface of ring and the lower surface, first ring channel and mounting hole intercommunication, the ring upper surface down set up with the draw-in groove of fixture block adaptation, draw-in groove and fixture block dislocation set, draw-in groove and first ring channel and mounting hole intercommunication are located the second ring channel has been seted up in the mounting panel of ring below, the torsional spring sets up in the second ring channel, torsional spring one end is connected on the ring, and the other end is connected in the mounting panel, the fixture block inlays through the draw-in groove and establishes in first ring channel.

Through adopting above-mentioned technical scheme, it makes draw-in groove and fixture block align to rotate the ring earlier, torsional spring is rotatory to have a moment of torsion power, will descend terminal and fixture block to aim at respectively and insert mounting hole and draw-in groove, the fixture block gets into first ring channel, then loosen the ring, the ring resets under the moment of torsion effect of torsional spring, draw-in groove and fixture block dislocation again, the lower terminal is just fixed in the mounting hole, thereby the fixing of switch body and mounting panel has been realized, whole installation is simple, can not produce great vibrational force, can avoid the inside part position of switch body to take place the skew.

Preferably, the upper surface of the circular ring is provided with a rotating block.

Through adopting above-mentioned technical scheme, can more conveniently rotate the ring through the turning block.

Preferably, the heating pipe is provided with two lower terminals which are symmetrically arranged below the second annular groove.

Through adopting above-mentioned technical scheme, set up two heating pipes through the symmetry can be more even heat the terminal down to make better transmission of heat to whole switch body shell.

Preferably, the outer side wall of the lower terminal is provided with a heat conduction layer.

Through adopting above-mentioned technical scheme, because the outmost epoxy of moulding plastics of switch body usually is as the insulating layer, and epoxy's heat conductivity is not good, consequently through setting up the heat-conducting layer, can make the better transmission of heat of heating pipe to the lower terminal on, improve heat conduction efficiency.

Preferably, the outer surface of the mounting plate is provided with an insulating layer.

Through adopting above-mentioned technical scheme, can prevent through setting up the heat preservation that the heat in the mounting panel scatters and disappears to avoid the waste of heat energy.

Preferably, still include operating device, operating device sets up on one side lateral wall of switch body, operating device is last to be provided with the manometer that is used for detecting the inside atmospheric pressure of switch body, operating device is last to be provided with manual closing button and manual separating brake button, be provided with in the operating device with manometer complex control circuit, control circuit can control SF6 load switch's electronic closing and separating brake, works as when the manometer detects the low pressure, control circuit responds and forbids manual closing button and manual separating brake button to press, and SF6 load switch can't realize electronic closing and separating brake.

Through adopting above-mentioned technical scheme, through setting up manometer and on-off control circuit, when gaseous the taking place to reveal of SF6 in the switch body, the internal atmospheric pressure of switch diminishes, the manometer detects the low pressure, and control circuit responds at once and forbids SF6 load switch's manual combined floodgate, manual separating brake and all actions electronic and floodgate, electronic separating brake to avoid SF6 load switch because lost insulating medium and the phenomenon that appears drawing an arc, and then lead to the staff to electrocute.

Preferably, the control circuit comprises a switch control loop, the switch control loop comprises a first control small bus, an electric closing button, an electric opening button, a travel switch, a motor, a low-voltage alarm switch, an automatic switch, a locking electromagnet and a second control small bus, the locking electromagnet is arranged at the operating hole of the closing button and the operating hole of the opening button, the output end of the first control small bus is sequentially connected with the electric closing button, the travel switch, the motor and the second control small bus in series, the electric opening button is connected with two ends of the electric closing button in parallel, the low-voltage alarm switch normally-closed contact, the automatic switch and the locking electromagnet are sequentially connected with two ends of the electric closing button and the motor in parallel, when the pressure gauge detects low voltage, the low-voltage alarm switch normally-closed contact is disconnected, the locking electromagnet is powered off, and the travel switch is disconnected, and the iron sheet of the locking electromagnet blocks the operation holes of the manual closing button and the manual opening button.

By adopting the technical scheme, when the pressure gauge detects low pressure, the normally closed contact of the low-pressure alarm switch is disconnected, the latching electromagnet loses power, the travel switch is disconnected, and then the loops where the electric switching-on button and the electric switching-off button are located are all failed, and electric switching-on and electric switching-off are forbidden; due to the fact that the locking electromagnet is powered off, the iron sheet on the suction head of the locking electromagnet falls down, the iron sheet blocks the operation holes of the manual closing button and the manual opening button, and the manual opening button cannot be pressed down, and the phenomenon that an SF6 load switch is subjected to arc discharge due to the fact that a worker presses the manual opening button and the manual opening button due to operation errors can be avoided. The above steps can also be realized by the staff by actively switching off the automatic switch.

Preferably, the control circuit further comprises an alarm circuit, the alarm circuit comprises a buzzer, and the low-voltage alarm switch normally-open contact and the buzzer are sequentially connected in parallel at two ends of the low-voltage alarm switch normally-closed contact and the latching electromagnet.

By adopting the technical scheme, when the pressure gauge detects low pressure, the normally open contact of the low-pressure alarm switch is closed, the buzzer is electrified, and the buzzer gives an alarm.

In summary, the present application includes at least one of the following beneficial technical effects:

(1) when a worker installs the SF6 load switch, firstly, three lower terminals of a switch body are inserted into the mounting holes, the three lower terminals are respectively fixed in the three mounting holes through fixing components, then the switch body is fixed with the mounting plate, and then the whole mounting plate and the switch body are fixed in the power distribution cabinet together, so that the deviation of the positions of parts inside the switch body in the installation process can be avoided, and by arranging a heating pipe and a temperature sensor, when the temperature of a use environment is lowered to a certain value, the temperature sensor senses and enables the heating pipe to start heating, the heat of the heating pipe is transferred to the lower terminals, the lower terminals transfer the heat to a metal shell of the whole switch body in an insulating heat conduction mode, so that the phenomenon that SF6 gas is liquefied due to the fact that the temperature in the switch body is too low is; after the heating pipe is used for heating, when the surface temperature of the switch body reaches a certain value, the temperature sensor senses and enables the heating pipe to stop heating, and the switch body is prevented from being damaged due to overhigh temperature;

(2) the ring is rotated to enable the clamping groove to be aligned with the clamping block, the torsional spring rotates to have a torque force, the lower terminal and the clamping block are respectively aligned and inserted into the mounting hole and the clamping groove, the clamping block enters the first annular groove, then the ring is loosened, the ring resets under the torque force of the torsional spring, the clamping groove and the clamping block are dislocated again, and the lower terminal is fixed in the mounting hole, so that the switch body and the mounting plate are fixed, the whole mounting process is simple, large vibration force cannot be generated, and the position of a part in the switch body can be prevented from being deviated;

(3) when the pressure gauge detects low pressure, the normally closed contact of the low-pressure alarm switch is disconnected, the locking electromagnet loses power, the travel switch is disconnected, and then the loops where the electric closing button and the electric opening button are located are all failed, and electric closing and electric opening are forbidden; due to the fact that the locking electromagnet is powered off, the iron sheet on the suction head of the locking electromagnet falls down, the iron sheet blocks the operation holes of the manual closing button and the manual opening button, and the manual opening button cannot be pressed down, and the phenomenon that an SF6 load switch is subjected to arc discharge due to the fact that a worker presses the manual opening button and the manual opening button due to operation errors can be avoided. The above steps can also be realized by the staff by actively switching off the automatic switch.

Drawings

Fig. 1 is a schematic structural diagram of an SF6 load switch according to an embodiment of the present application;

fig. 2 is a front cross-sectional view of an SF6 load switch of an embodiment of the present application;

FIG. 3 is an enlarged view at A in FIG. 1;

FIG. 4 is an enlarged view at B in FIG. 2;

FIG. 5 is a side cross-sectional view of an SF6 load switch of an embodiment of the present application;

FIG. 6 is an enlarged view at C in FIG. 5;

fig. 7 is a schematic diagram of a control loop of an embodiment of the present application.

Description of reference numerals: KMa, a first control small bus; QF1, a first air switch; SBC, electric closing button; SBS, electric brake-separating button; s1, a travel switch; m, a motor; QF2, second air switch; KMc, a second control small bus; SB1, low-voltage alarm switch normally closed contact; SB2, low-voltage alarm switch normally open contact; s2, automatic switching; y1, latching electromagnet; HA. A buzzer; 1. a switch body; 2. an operating mechanism; 3. mounting a plate; 4. a lower terminal; 5. mounting holes; 6. a clamping block; 7. a circular ring; 8. a torsion spring; 9. a first annular groove; 10. a card slot; 11. a second annular groove; 12. mounting grooves; 13. heating a tube; 14. a temperature sensor; 15. rotating the block; 16. a heat conductive layer; 17. a heat-insulating layer; 18. a pressure gauge; 19. a manual closing button; 20. a manual brake-separating button; 21. a control circuit; 22. a switch control loop; 23. and an alarm circuit.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

The embodiment of the application discloses an SF6 load switch with a heating function. Referring to fig. 1 and 2, the SF6 load switch comprises a switch body 1, an operating mechanism 2 and a mounting plate 3, wherein the operating mechanism 2 is mounted on a side wall of the switch body 1, three lower terminals 4 are arranged at intervals at the bottom of the switch body 1, three mounting holes 5 which are in plug-in fit with the lower terminals 4 are arranged at intervals along the length direction on the corresponding positions of the upper surface of the mounting plate 3, a fixing component is arranged in the mounting plate 3, and the lower terminals 4 are fixed in the mounting holes 5 through the fixing component.

Specifically, referring to fig. 3 and 4, the fixing assembly includes two latch 6, a ring 7, and a torsion spring 8. The two latch blocks 6 are symmetrically fixed on the side wall of the lower terminal 4, and the two latch blocks 6 are arranged along the length direction of the mounting plate 3. The ring 7 is rotatably connected to the side wall of the upper end of the mounting hole 5, a first annular groove 9 is formed in the side wall of the middle of the ring 7, and the first annular groove 9 is communicated with the mounting hole 5. Two clamping grooves 10 which are matched with the clamping blocks 6 in an inserting mode are vertically and downwards formed in the upper surface of the circular ring 7, the two clamping grooves 10 are communicated with the first annular groove 9 and the mounting hole 5, and the two clamping grooves 10 are oppositely arranged and are respectively arranged in a staggered mode with the two clamping blocks 6. A second annular groove 11 is formed in the mounting plate 3 below the circular ring 7, the second annular groove 11 is not communicated with the mounting hole 5, the torsion spring 8 is arranged in the second annular groove 11, the upper end of the torsion spring 8 is fixed to the bottom of the circular ring 7, and the lower end of the torsion spring 8 is fixed to the mounting plate 3. The two clamping blocks 6 enter the first annular groove 9 through the clamping grooves 10.

Referring to fig. 5 and 6, a mounting groove 12 is formed in the mounting plate 3 on one side of the mounting hole 5 along the length direction, one side of the mounting groove 12 communicates with the outside of the mounting plate 3, and the mounting groove 12 communicates with the three mounting holes 5.

Referring to fig. 1 and 6, a heating pipe 13 is arranged in the mounting groove 12, a lead of one end of the heating pipe 13 extends to the outside of the mounting plate 3, and the other end of the heating pipe 13 penetrates through the mounting groove 12 and is tightly attached to the side walls of the three lower terminals 4. The side wall of the switch body 1 opposite to the operating mechanism 2 is provided with a temperature sensor 14, when the temperature sensor 14 detects a preset lower limit temperature value, the heating pipe 13 starts to heat, and when the temperature sensor 14 detects a preset upper limit temperature value, the heating pipe 13 stops heating.

Through the above scheme, on the one hand, the staff rotates earlier ring 7 makes two draw-in grooves 10 align with two fixture blocks 6 respectively, torsional spring 8 takes place to deform and produces a moment of torsion power, then insert fixture block 6 draw-in groove 10, fixture block 6 inlays through draw-in groove 10 and establishes in first ring channel 9, loosen ring 7 this moment, ring 7 resets under torsional spring 8's moment of torsion power, draw-in groove 10 once more misplaces with fixture block 6 and can't break away from in first ring channel 9, switch body 1 just fixes in mounting panel 3, can install mounting panel 3 and switch body 1 in the switch board together in follow-up installation, thereby avoid producing great vibration because of switch body 1 is too big in the installation, further the part position that leads to switch body 1 inside takes place to deviate.

On the other hand, the three lower terminals 4 are fixed in the mounting holes 5, the heating pipe 13 is tightly attached to the side walls of the three lower terminals 4, when the temperature sensor 14 detects that the temperature of the shell of the switch body 1 is lower than the lower limit value, the temperature sensor 14 sends a signal to a controller (not shown in the figure), the controller sends the signal again to enable the heating pipe 13 to start heating, and the heat of the heating pipe 13 is transferred to the lower terminals 4 in an insulation heat conduction mode and further transferred to the whole switch body 1, so that a heat preservation effect is achieved inside the switch body 1, and the phenomenon that an SF6 load switch is subjected to arc discharge due to loss of an insulation medium because of liquefaction of low temperature of SF6 gas is avoided; when the temperature sensor 14 detects that the temperature of the shell of the switch body 1 reaches a certain upper limit value, the temperature sensor 14 sends a signal to the controller again, and the controller stops heating the heating pipe 13 again, so that the influence on the use of the SF6 load switch due to overhigh external temperature is avoided.

In this embodiment, the lower limit temperature value and the upper limit temperature value detected by the temperature sensor 14 are-20 ℃ and 35 ℃, respectively; the heating pipes 13 are symmetrically arranged on the side walls of the three lower terminals 4, and the two heating pipes 13 are uniformly arranged to more uniformly transfer heat to the lower terminals 4, so that the heat can be transferred to the whole switch body 1 more quickly and uniformly.

Referring to fig. 3, the rotating block 15 is disposed on the upper surface of the ring 7 located at the engaging position of the engaging block 6, the rotating block 15 is arc-shaped, and the ring 7 can be rotated more easily by the rotating block 15.

Referring to fig. 5 and 6, because the outer layer of the conventional switch body 1 can be molded with an epoxy resin layer as an insulating layer, and the thermal conductivity of the epoxy resin is poor, in this embodiment, the outer layer of the lower terminal 4 is molded into the heat conduction layer 16, the heating pipe 13 is tightly attached to the heat conduction layer 16, and by arranging the heat conduction layer 16, the heat of the heating pipe 13 can be better transferred to the lower terminal 4, so that the heat conduction efficiency is improved. The surface of mounting panel 3 except the one side towards switch body 1, other five all claddings have one deck heat preservation 17, can reduce heating pipe 13 in the thermal giving off of in-process that generates heat through heat preservation 17 to heating pipe 13 stops to heat the back, utilizes the inside waste heat of mounting panel 3 can continue to terminal 4 transfer heat down, thereby improves thermal utilization ratio.

In this embodiment, the heat conducting layer 16 is a pouring sealant layer, and the pouring sealant has good heat conductivity, strong adhesive force, and moisture resistance; the material of heat preservation 17 is polyurethane heated board, and polyurethane thermos cup coefficient of heat conductivity is lower to it is fine dampproofing effect still to have.

Referring to fig. 1, the operating mechanism 2 is provided with a pressure gauge 18, a manual closing button 19 and a manual opening button 20, the pressure gauge 18 is used for detecting gas pressure inside the switch body 1, and the manual closing button 19 and the manual opening button 20 are used for manual closing and opening.

Referring to fig. 7, the operating mechanism 2 is internally provided with a control circuit 21 cooperating with the pressure gauge 18, when the pressure gauge 18 detects a low pressure, the control circuit 21 responds to and prohibits the manual closing button 19 and the manual opening button 20 from being pressed, and the SF6 load switch cannot realize electric closing and opening.

The control circuit 21 comprises a switch control circuit 22, and the switch control circuit 22 comprises a first control small bus KMa, a first air switch QF1, an electric closing button SBC, an electric opening button SBS, a travel switch S1, a motor M, a low-voltage alarm switch, an automatic switch S2, a latching electromagnet Y1, a second air switch QF2 and a second control small bus KMc. The latching electromagnet Y1 is arranged at the operation holes (not shown in the figure) of the manual closing button 19 and the manual opening button 20, the output end of the first control small bus KMa is sequentially connected with the electric closing button SBC, the travel switch S1, the motor M and the second control small bus KMc in series, the electric opening button SBS is connected with two ends of the electric closing button SBC in parallel, and the low-voltage alarm switch normally-closed contact SB1, the automatic switch S2 and the latching electromagnet Y1 are sequentially connected with two ends of the electric closing button SBC and the motor M in parallel.

When the pressure gauge 18 detects low pressure, the normally closed contact SB1 of the low-pressure alarm switch is disconnected, the locking electromagnet Y1 loses power, the iron sheet of the locking electromagnet Y1 blocks the operation holes of the manual closing button 19 and the manual opening button 20, the manual closing button 19 and the manual opening button 20 cannot be pressed, and manual closing and opening cannot be performed at the moment; the locking electromagnet Y1 loses power, the travel switch S1 is disconnected, two loops where the electric closing button SBC and the electric opening button SBS are located are all broken, at the moment, the switch body 1 cannot perform electric closing and electric opening, and all closing and opening actions of the SF6 load switch are all locked, so that the phenomenon of arc discharge caused by closing and opening of the SF6 load switch due to misoperation of a worker is avoided, and the life safety of the worker is protected. Similarly, when the requirement is special, the staff can also lock all closing and opening actions of the SF6 load switch by directly opening the automatic switch S2.

The control circuit 21 further comprises an alarm circuit 23, the alarm circuit 23 comprises a buzzer HA, and the low-voltage alarm switch normally-open contact SB2 and the buzzer HA are sequentially connected in parallel at two ends of the low-voltage alarm switch normally-closed contact SB1 and the locking electromagnet Y1. When the pressure gauge 18 detects low pressure, the normally open contact SB2 of the low pressure alarm switch is closed, the buzzer HA is electrified, and the buzzer HA gives an alarm, so that the staff is reminded that the SF6 gas pressure in the switch body 1 is leaked at the moment.

The implementation principle of the SF6 load switch with the heating function in the embodiment of the application is as follows: the switch comprises a switch body 1, a mounting plate 3, a lower terminal 4, a fixing assembly, a heating pipe 13, a temperature sensor 14 and a temperature sensor 14, wherein the mounting plate 3 is arranged, the lower terminal 4 is fixed in the mounting plate 3 through the fixing assembly, the switch body 1 is fixed in the mounting plate 3, and when the mounting plate 3 and the switch body 1 are subsequently mounted in a power distribution cabinet together, the vibration generated by the switch body 1 in the mounting process can be reduced through the transitional action of the mounting plate 3; the operating mechanism 2 is provided with the pressure gauge 18 and the control circuit 21, when SF6 gas in the switch body 1 leaks, the pressure gauge 18 detects low pressure, the control circuit 21 responds to and locks all closing and opening actions of the SF6 load switch, the phenomenon of arc discharge caused by closing and opening of the SF6 load switch due to misoperation of workers is avoided, and the life safety of the workers is guaranteed.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.