CN115579817B

CN115579817B - Temperature-sensing protection type bus duct structure and protection method thereof

Info

Publication number: CN115579817B
Application number: CN202211329493.4A
Authority: CN
Inventors: 杨卫彬; 马玉建; 田厚虎
Original assignee: ZHENJIANG CITY YADONG HIGH VOLTAGE ELECTRIC APPLIANCE FACTORY
Current assignee: ZHENJIANG CITY YADONG HIGH VOLTAGE ELECTRIC APPLIANCE FACTORY
Priority date: 2022-10-27
Filing date: 2022-10-27
Publication date: 2023-05-30
Anticipated expiration: 2042-10-27
Also published as: CN115579817A

Abstract

The invention relates to a temperature-sensing protection type bus duct structure and a protection method thereof, wherein a closed box body structure is formed by two joint sealing pieces in butt joint in the bus duct structure; the temperature monitoring mechanism and the power-off protection mechanism are mutually matched, so that an alarm signal is sent out when the surface temperature of the copper bar reaches an alarm value, and the copper bar is powered off when the surface of the copper bar reaches the trigger temperature of the power-off protection mechanism; the trigger temperature of the power-off protection mechanism is lower than the reset temperature thereof. The trigger temperature and the reset temperature of the power-off protection mechanism have a difference value; the problem that equipment is damaged due to the fact that equipment connected with the bus duct power supply system is frequently started and stopped is solved.

Description

Temperature-sensing protection type bus duct structure and protection method thereof

Technical Field

The invention relates to a temperature-sensing protection type bus duct structure and a protection method thereof.

Background

The bus duct is a comprehensive device for a metal enclosed bus, and is a structure for enclosing three-phase conductors in a metal shell. The device applied to the large power supply scene can replace the traditional bare wire arrangement mode.

The bus duct power supply system is usually equipped with a switch to control the on-off of the bus duct power supply system and the power grid set (substation). The plurality of devices powered by the bus duct power supply system inevitably increases the conductive load of the bus duct power supply system when a plurality of devices are started simultaneously, thereby causing the copper bars in the bus duct structure to generate heat. The principle is the same as that of the tripping of a household power grid, and when a plurality of electric equipment in the household are started at the same time (especially in summer), the gate can be automatically cut off so as to protect the safety of electricity.

In order to ensure the safety of bus duct power transmission, a protection switch, namely a temperature control switch, is generally arranged in a wire duct in a bus duct power supply system; the copper bar is prevented from running at an ultra-high temperature; however, the existing temperature control switch can automatically power off the bus duct power supply system after the temperature exceeds a set value, but the copper bar is cooled after power off, and the power supply is automatically switched on after the temperature is lower than the set temperature, so that the equipment powered by the bus duct power supply system is frequently started, the power supply stability is not high, and the equipment is easy to damage.

Disclosure of Invention

The invention aims to provide a temperature-sensing protection type bus duct structure and a protection method thereof, which are used for solving the problems in the background technology.

In order to achieve the above purpose, the present invention provides the following technical solutions:

the utility model provides a temperature-sensing protection type bus duct structure, includes cell body structure, the both ends of cell body structure set up a joint sealing member respectively, seal the inside of cell body structure through setting up a joint sealing member respectively at cell body structure's both ends; the groove body structure comprises two cover plates and two shells, wherein the two shells are oppositely arranged, and the two cover plates are arranged on two sides of the shells to form a square groove structure with two through ends;

the bus duct structure further comprises copper bars, the copper bars are arranged in the duct body structure, and two ends of the copper bars penetrate through joint sealing pieces arranged at two ends of the duct body structure respectively. A plurality of mica insulation pieces are equidistantly arranged on the inner wall of the shell along the length direction of the shell, and a plurality of bayonets are equidistantly arranged on the mica insulation pieces along the width direction of the shell; the copper bars are parallel and are clamped in bayonets in the groove body in parallel;

a through hole for the copper bar to pass through is formed in one surface of the joint sealing piece, which is opposite to the copper bar, and sealing rubber strips are arranged on two sides of the through hole; filling channels are formed in the edge of one face, away from the groove body structure, of each joint sealing piece, and when two adjacent bus groove structures are in butt joint installation, a fireproof sealing ring is sealed and embedded between the filling channels on the two joint sealing pieces at the butt joint ends; and two joint sealing elements which are in butt joint form a closed box body structure;

The temperature monitoring mechanism and the power-off protection mechanism are mutually matched to send an alarm signal when the surface temperature of the copper bar reaches an alarm value, and power-off the copper bar when the surface of the copper bar reaches the trigger temperature of the power-off protection mechanism;

the triggering temperature of the power-off protection mechanism is lower than the resetting temperature of the power-off protection mechanism, and when the surface temperature of the copper bar reaches the triggering temperature, the power-off protection mechanism cuts off the power of the bus duct power supply system; and when the surface temperature of the copper bar is lower than the reset temperature, the power-off protection mechanism resumes the power supply of the bus duct power supply system.

The temperature-sensing protection type bus duct structure comprises the following components: the copper bar is provided with three straight sections, and circular arcs among the three straight sections are in smooth transition; the straight parts at the two ends are end fitting parts, and the straight part at the middle section is a clamping part; the clamping part is clamped with a bayonet on the mica insulating piece;

the end fitting parts at the two ends are respectively positioned at the two sides of the clamping part; the height difference between the clamping part and the end fitting part is smaller than half of the thickness of the copper bar; the joint parts at two ends of the same copper bar are respectively arranged in the through holes on the joint sealing parts at two ends of the groove body structure and penetrate into the closed box body structure; and connecting pieces are arranged at the outer sides of two ends of the cover plate and are respectively fixed with the shell, the cover plate and the joint sealing piece, so that the joint sealing piece and the groove body structure form a whole.

The temperature-sensing protection type bus duct structure comprises the following components: the temperature monitoring mechanism and the power-off protection mechanism are connected with the thermal expansion driving structure; the thermal expansion driving structure, the power-off protection mechanism and the temperature monitoring mechanism are all arranged in the closed box body structure;

the thermal expansion driving structure comprises a low expansion pipe arranged on the inner wall of the joint sealing piece, a temperature sensing piece attached to the end head attaching part, a flow guide pipe with one end communicated with the low expansion pipe and a sealing cylinder arranged on the inner wall of the joint sealing piece;

the low-expansion pipe and the flow guide pipe are filled with flowable temperature sensing agents, and the other end of the flow guide pipe is communicated with the tail end of the sealing cylinder; the temperature sensing piece is in a C shape, an inserting piece is integrally arranged at the middle position of the temperature sensing piece, and the inserting piece is inserted into the low-expansion pipe in a sealing way; the head end of the sealing cylinder is slidably and telescopically provided with a pressure release rod, one end of the pressure release rod is positioned in the sealing cylinder, and the other end of the pressure release rod extends out of the sealing cylinder;

a plunger is arranged at one end of the pressure release rod, which is positioned in the sealing cylinder, and the plunger is in sealing sliding fit with the inner wall of the sealing cylinder; and one end of the pressure release rod, which extends out of the sealing cylinder, is provided with an extension piece, and the power-off protection mechanism and the temperature monitoring mechanism are both connected with the extension piece.

The temperature-sensing protection type bus duct structure comprises the following components: the temperature monitoring mechanism comprises an extrusion frame arranged below the extension piece, a guide sleeve arranged on the inner wall of the joint sealing piece, a trigger rod penetrating through the guide sleeve in a sliding manner, and an alarm switch arranged on the inner wall of the joint sealing piece;

the extrusion frame is in a right trapezoid shape, and one section of the extrusion frame, which faces the trigger rod, is an isosceles trapezoid inclined waist edge; the upper end of the trigger rod is provided with a section of cylinder, and a second pulley is rotatably arranged at the top of the cylinder; a first pressure spring is arranged between the lower part of the cylinder and the guide sleeve, and the first pressure spring is sleeved outside the trigger rod; the second pulley is in rolling fit with the edge of the extrusion frame;

a buzzer is further arranged in the joint sealing piece, and the buzzer is electrically connected with the alarm switch through a wire; the lower end of the trigger rod is provided with a flat frame, and the lower part of the flat frame is provided with a movable contact towards the position of the alarm switch.

The temperature-sensing protection type bus duct structure comprises the following components: the power-off protection mechanism comprises a first pulley rotatably installed at one end of the extension piece far away from the sealing cylinder, a sliding frame arranged in the joint sealing piece, a sliding block in sliding fit with the sliding frame, a swing arm with one end rotatably arranged at the upper end of the sliding frame, and a tension spring for connecting the swing arm and the sliding block;

The sliding block is arranged in the sliding groove in a sliding manner, and the rear part of the sliding block is fixed with the flat frame; one end of the swing arm is provided with a rotating shaft and is in running fit with the upper end of the sliding frame through the rotating shaft;

the central positions of the sliding block and the swing arm are respectively provided with a pull column in a protruding mode, and two ends of the tension spring are respectively hung on the two pull columns; be provided with the gag lever post in the joint sealing member, the oscillating arm laminating gag lever post under the initial state still installs micro-gap switch assembly in the joint sealing member, micro-gap switch assembly connects bus duct power supply system.

The temperature-sensing protection type bus duct structure comprises the following components: the micro-switch assembly is arranged in the joint sealing piece and is provided with a power-off contact and a conductive contact respectively;

a switching key is rotatably arranged above the micro switch, one side of the switching key is elastically connected with the micro switch through an elastic sheet, and the elastic sheet is kept in a pressed state; the micro switch is connected with the electric switch, and the electric switch is connected with the bus duct power supply system.

The temperature-sensing protection type bus duct structure comprises the following components: the power-off protection mechanism further comprises a reset assembly, wherein the reset assembly is used for driving the swing arm to reset to be attached to the limiting rod; the reset component comprises a follow-up frame arranged on one side of the extension piece, a toothed plate arranged on the lower part of the follow-up frame, a gear rotationally arranged in the joint sealing piece and matched with the toothed plate, and a meshing tooth group used for connecting the gear with the rotating shaft;

The meshing teeth set can only drive in a single direction, and the toothed plate is partially matched with the gear.

The temperature-sensing protection type bus duct structure comprises the following components: the meshing tooth group comprises a first inclined tooth clamping wheel coaxially arranged with the gear, a second inclined tooth clamping wheel coaxially and slidably matched with the rotating shaft, and a second pressure spring elastically connecting the second inclined tooth clamping wheel with the upper end of the sliding frame;

the outer edge of one side surface of the first inclined tooth clamping wheel, which is close to the second inclined tooth clamping wheel, is provided with a circle of triangular teeth; the outer edge of one side surface of the second inclined tooth clamping wheel, which is close to the first inclined tooth clamping wheel, is provided with a circle of inverted triangle teeth, and the inverted triangle teeth are matched with the triangle teeth;

one end of the second pressure spring is attached to the second inclined tooth clamping wheel, the other end of the second pressure spring is attached to the side wall of the upper end of the sliding frame, and the second pressure spring is pressed.

The temperature-sensing protection type bus duct structure comprises the following components: the surface of pivot is provided with the feather key along its axial, and the second is inclined tooth clamping wheel's central authorities seted up with the jack that the pivot slides and inserts is established, set up on the inner wall of jack with feather key sliding block's keyway.

A protection method of a temperature-sensing protection type bus duct structure comprises the following steps:

step one, pre-expanding, wherein when the copper bar in the bus duct structure is powered off, the temperature sensing agent in the low-expansion pipe is in a normal temperature state; when the copper bar in the bus duct structure is electrified and is in a rated current state, the copper bar heats, the temperature of the surface of the copper bar is conducted into the low-expansion pipe through the temperature sensing piece, so that the temperature sensing agent in the low-expansion pipe is expanded and is filled with the diversion pipe;

Step two, the expansion action, when the copper bar is overloaded and conducts electricity, the temperature of the surface of the copper bar is further increased, so that the temperature sensing agent is further expanded and discharged into the sealing cylinder, and the plunger and the pressure release rod are pushed to further extend out of the sealing cylinder so as to drive the extension piece, the extrusion frame, the first pulley, the follow-up frame and the toothed plate to be far away from the sealing cylinder;

the extrusion frame drives the trigger rod, the flat frame and the movable contact to move downwards under the action of the guide sleeve through the second pulley and extrudes a first pressure spring; the following frame and the toothed plate are far away from the sealing cylinder to drive the gear and the first helical gear to rotate; however, the first helical gear can not drive the second helical gear to rotate; the flat rack drives the sliding block to slide downwards along the sliding groove, so that the tension spring is further stretched, and the elasticity of the tension spring is increased;

triggering an alarm, wherein when the second pulley moves to the end point of the inclined waist edge of the extrusion frame, the sliding block reaches the lowest part of the sliding groove; meanwhile, the movable contact triggers an alarm switch, the buzzer is connected with a power supply, and an alarm signal is sent out;

step four, power-off protection, wherein when the copper bar conducts electricity under ultrahigh load, the temperature of the surface of the copper bar is further increased on the basis of overload conduction, and the temperature sensing agent is further expanded; the extension piece, the extrusion frame, the first pulley, the follow-up frame and the toothed plate are further far away from the sealing cylinder;

The second pulley rolls along the lower edge of the extrusion frame, the sliding block is kept at the lowest part of the sliding groove, and the movable contact always triggers the alarm switch; the first pulley is continuously close to the swing arm; when the first pulley is attached to the swing arm, the first pulley extrudes the swing arm to enable the swing arm to swing in the vertical direction; after the swing arm swings to the vertical position, the swing arm rapidly acts under the action of a tension spring to trigger the power-off contact, so that the bus duct power supply system is powered off;

step five, cooling and resetting, and gradually cooling the copper bar after power failure; the temperature sensing agent contracts in the cooling process, so that the plunger, the pressure release rod, the extension piece, the extrusion frame, the first pulley, the follow-up frame and the toothed plate are reset;

in the resetting process of the extrusion frame, the second pulley rolls from the lower edge of the extrusion frame to the inclined waist edge of the extrusion frame, the movable contact is separated from the alarm switch, and the buzzer is contacted for alarm; simultaneously, the sliding block slides upwards, so that the elasticity of the tension spring is reduced; when the second pulley rolls to the midpoint of the inclined waist edge of the extrusion frame, the toothed plate starts to be meshed with the gear; the sliding block is positioned at the middle position of the sliding groove, the elasticity of the tension spring is reduced, the rotating shaft is driven to reset through the meshing tooth group under the action of the gear, the swing arm starts to reset, and the conductive contact is switched on again under the action of the elastic sheet; when the plunger, the pressure release rod, the extension piece, the extrusion frame, the first pulley, the follow-up frame and the toothed plate are completely reset, the sliding block is positioned at the highest position of the sliding groove; and the swing arm swings to be attached to the limit column.

Compared with the prior art, the invention has the beneficial effects that: because the end fitting part of the copper bar end is limited by the through hole, a section of the copper bar penetrating out of the groove body structure cannot be bent; and because the height difference between the clamping part and the end fitting part is less than half of the thickness of the copper bars, after the end fitting part penetrates into the closed box body structure, the corresponding copper bars in the bus duct structures at the two ends which are connected can be mutually fitted, and the mutual fitting conduction between the two copper bars which are butted can be realized on the premise of not needing a split bolt.

And because the end fitting part penetrates into the through hole, the copper bar can be kept stably fixed in the groove body structure under the constraint of the arc smooth transition part on the copper bar and the through hole, and the movement can not be generated along the length direction of the groove body structure.

The bus duct structure is provided with the temperature monitoring mechanism and the power-off protection mechanism, so that an alarm can be given out when the copper bar is in overload power supply and heating during use, and the whole bus duct structure is powered off when the copper bar is in ultrahigh load power supply, so that the bus duct structure is prevented from being damaged due to long-time ultrahigh load or overload operation.

The trigger temperature and the reset temperature of the power-off protection mechanism have a difference value; the problem that equipment is damaged due to the fact that equipment connected with the bus duct power supply system is frequently started and stopped is solved.

Drawings

FIG. 1 is a schematic diagram of a temperature-sensing protective busway structure;

FIG. 2 is an exploded view of a temperature-sensitive protective busway structure;

FIG. 3 is a schematic diagram of a structure of a temperature-sensitive protective bus duct after one of the cover plates is removed after the explosion;

FIG. 4 is a schematic view of the structure of the connection member and the closed box in the structure of the temperature-sensing protection type bus duct;

FIG. 5 is a schematic view of one of the joint seals removed from the base of FIG. 4;

FIG. 6 is a schematic view of the structure of FIG. 5 after one of the copper bars is removed;

FIG. 7 is a schematic illustration of the low expansion tube, temperature sensing strip, and baffle being removed from the joint seal;

FIG. 8 is a schematic view of the temperature sensing sheet separated from the low expansion tube based on FIG. 7;

FIG. 9 is a schematic view of the low expansion tube, temperature sensing sheet, and baffle of FIG. 8 with portions broken away;

FIG. 10 is a schematic view of the compression release lever, extension member, and compression frame of FIG. 9 shown separated;

FIG. 11 is a schematic illustration of a portion of the temperature monitoring mechanism and the power-off protection mechanism separated from the joint seal;

FIG. 12 is a schematic view of the joint seal after removal of the joint seal from FIG. 11;

FIG. 13 is a schematic view of the structure of FIG. 12 in another orientation;

Fig. 14 is an enlarged view at a in fig. 13;

FIG. 15 is a partial exploded view of FIG. 13;

FIG. 16 is a schematic view of the structure of FIG. 15 in another orientation;

FIG. 17 is a schematic view of the structure of the combination of the biting teeth;

FIG. 18 is a schematic view of the structure of the bite teeth assembly in combination with the disassembly;

FIG. 19 is a plan view of a single copper bar;

FIG. 20 is a partial cutaway view of two adjacent copper bars about to be assembled;

in the figure: 1-a cover plate; 2-a housing; 3-joint seals; 4-connecting piece; a 5-mica insulation; 6-guard; 7-copper bars; 8-a low expansion tube; 9-a temperature sensing sheet; 10-a flow guiding pipe; 11-a sealing cylinder; 12-a pressure release lever; 13-an extension; 14-pressing the frame; 15-a first pulley; 16-a second pulley; 17-a trigger lever; 18-guiding sleeve; 19-a first pressure spring; 20-flat rack; 21-a movable contact; 22-an alarm switch; 23-a buzzer; 24-sliding blocks; 25-carriage; 26-a chute; 27-a tension spring; 28-swing arm; 29-a switch key; 30-a micro switch; 31-shrapnel; 32-breaking contacts; 33-conductive contacts; 34-a follower rack; 35-tooth plate; 36-gear; 37-a first helical gear; 38-a second helical gear; 39-second compression spring; 40-limiting rods; 41-a rotating shaft; 42-sliding key; 43-keyway; 44-a refractory seal ring; 45-filling the channel.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.

Referring to fig. 1 to 18, as an embodiment of the present invention, the temperature-sensing protection bus duct structure includes a duct structure, two ends of the duct structure are respectively provided with a joint sealing member 3, and two ends of the duct structure are respectively provided with a joint sealing member 3 to seal the interior of the duct structure so as to prevent electric leakage or external conductive medium, especially conductive fluid, from flowing into the duct structure to generate short circuit;

the groove body structure comprises two cover plates 1 and two shells 2, wherein two shells 2 are oppositely arranged, and the two cover plates 1 are arranged on two sides of the shells 2 to form a square groove structure with two through ends.

The bus duct structure further comprises copper bars 7, the copper bars 7 are arranged in the duct body structure, and two ends of the copper bars 7 penetrate through joint sealing pieces 3 arranged at two ends of the duct body structure respectively. A plurality of mica insulation pieces 5 are equidistantly arranged on the inner wall of the shell 2 along the length direction of the shell, and a plurality of bayonets are equidistantly arranged on the mica insulation pieces 5 along the width direction of the shell 2; the copper bars 7 are parallel and are clamped in bayonets in the groove body.

The plurality of copper bars 7 can be guaranteed to be parallel to each other through the bayonet socket on the mica insulating part 5 and the mica insulating part 5 that set up, and the interval between two next copper bars 7 reaches safe winding displacement distance, avoids the mutual contact to produce the short circuit between the different copper bars 7 in the same cell body structure.

The joint sealing piece 3 is provided with a through hole for the copper bar 7 to pass through on one surface opposite to the copper bar 7, and sealing rubber strips are arranged on two sides of the through hole.

A filling channel 45 is formed in the edge of one surface of the joint sealing piece 3, which is away from the groove body structure, and a refractory sealing ring 44 is sealed and embedded between the filling channels 45 on the two joint sealing pieces 3 at the butt joint end when the two adjacent bus duct structures are in butt joint installation; and the two joint seals 3 in butt joint form a closed box structure.

Because the edges of the two joint sealing pieces 3 are provided with the filling channels 45, and when the two joint sealing pieces 3 are in butt joint, the corresponding two filling channels 45 are sealed and embedded with the fireproof sealing ring 44; there is no leakage gap between the two abutting joint seals 3.

Copper bar 7 ends in two adjacent bus duct structures are butted in a closed box body structure; and because both sides of the through hole are provided with sealing rubber strips, the end heads of the copper bars 7 penetrate into the closed box body structure from the groove body structure under the action of the sealing rubber strips, namely the closed box body structure is always in a sealing state.

In order to further improve the insulation performance of the groove body structure, the protection piece 6 is installed on the inner side wall of the cover plate 1, and the protection piece 6 is made of an insulation material, so that electric leakage between the copper bar 7 and the cover plate 1 can be avoided.

The sealed box body structure is internally provided with a temperature monitoring mechanism and a power-off protection mechanism, and the temperature monitoring mechanism and the power-off protection mechanism are mutually matched to send out an alarm signal when the surface temperature of the copper bar 7 reaches an alarm value and to power off the copper bar 7 when the surface of the copper bar 7 reaches the trigger temperature of the power-off protection mechanism;

the triggering temperature of the power-off protection mechanism is lower than the resetting temperature of the power-off protection mechanism, and when the surface temperature of the copper bar 7 reaches the triggering temperature, the power-off protection mechanism cuts off the power of the bus duct power supply system; and when the surface temperature of the copper bar is lower than the reset temperature, the power-off protection mechanism resumes the power supply of the bus duct power supply system.

It is noted that the bus duct structure is provided with the temperature monitoring mechanism and the power-off protection mechanism, so that an alarm can be given out when the copper bar 7 is in overload power supply and heating during use, and the whole bus duct structure is powered off when the copper bar 7 is in ultrahigh load power supply, so that damage to the bus duct structure caused by long-time ultrahigh load or overload operation is avoided.

Different from the existing mechanical temperature controller, the trigger temperature and the reset temperature of the power-off protection mechanism have a difference value. Namely, the trigger temperature and the reset temperature of the power-off protection mechanism are different, and particularly, the trigger temperature of the power-off protection mechanism is higher than the reset temperature.

The purpose of this setting is to avoid bus duct power supply system to switch on frequently and the outage to overcome the equipment that is connected with bus duct power supply system and frequently open and close, cause the damage of equipment.

In detail, the construction principle of the existing mechanical temperature controller is different in size and comprises a temperature sensing element; when the temperature is increased, heat generated by the increase of the ambient temperature is transferred to the temperature sensing element, the temperature sensing element deforms, when the temperature reaches a preset temperature value, the deformation of the temperature sensing element enables the contact to be opened or closed, when the temperature is reduced to the preset temperature value, the temperature sensing element is restored to be in a shape, the contact is enabled to be closed or opened, and the purpose of switching on or off a circuit is achieved, so that the circuit is controlled.

It is easy to find that the existing mechanical temperature controller realizes the on-off of a temperature control circuit by utilizing the principle of thermal expansion and cold contraction, when the temperature increases to a preset temperature, the temperature sensing element expands and triggers the contact to enable the switch to be powered off or powered on; when the temperature is cooled to a preset temperature, the temperature sensing element is contracted and separated from the contact, so that the switch is turned on or off.

As is well known, the temperature sensing element heats up and expands when energized, and cools down and contracts when deenergized; the internal energy of thermal expansion is mainly derived from the heat generated when the circuit is energized.

Therefore, if the existing mechanical temperature controller is directly applied to the bus duct structure, the problem of frequently starting the equipment can occur when the temperature of the copper bar 7 in the bus duct structure is monitored.

Assuming that the preset critical temperature of the copper bar 7 is 60 ℃ and the temperature of the copper bar 7 under the rated load is 40 ℃, when the current in the bus duct power supply system is increased relative to the rated current (overload power supply), the surface temperature of the copper bar 7 is increased on the basis of 40 ℃; when the surface temperature of the copper bar 7 reaches 60 ℃, the bus duct power supply system is indicated to be at the limit of safe power supply.

When the existing mechanical temperature controller is applied to a bus duct power supply system, the whole bus duct power supply system is powered off when the temperature of the copper bar 7 reaches 60 ℃, and equipment electrically connected with the power supply system is stopped; after the power is off, the copper bar 7 starts to cool down, and when the temperature is lower than 60 ℃, the power is supplied again, and the equipment is restarted.

In the practical application process, the overload power supply leads the copper bar 7 to be possibly powered off when the temperature reaches 60.1 ℃, and the bus duct power supply system is powered off and the equipment is stopped; after the power is off, the temperature of the copper bar 7 is reduced to 59.9 ℃, and when the temperature is reduced to 59.9 ℃, the bus duct power supply system is electrified again, and the equipment is started; this has the problem of frequent start-up of the device as described above.

The power-off protection mechanism can power off the bus duct power supply system when the temperature of the copper bar 7 reaches 60 ℃, and can power on the bus duct power supply system again when the temperature of the copper bar 7 is cooled to 50 ℃; therefore, the problem that the bus duct power supply system is frequently powered on and powered off can be avoided, and the problem of frequent starting of equipment is solved.

As a further aspect of the present invention, referring to fig. 2, 3, and 5, the copper bar 7 has three straight sections, and the circular arcs between the three straight sections are in smooth transition; the flat parts at the two ends are end fitting parts 46, and the flat part at the middle section is a clamping part 47; the clamping part 47 is clamped with a bayonet on the mica insulator 5;

referring to fig. 19, the end fitting portions 46 at the two ends are respectively located at two sides of the engaging portion 47.

Referring to fig. 20, the height difference between the clamping portion 47 and the end fitting portion 46 is less than half the thickness of the copper bar 7, i.e. h1 in fig. 20 is slightly less than h2; the purpose of the arrangement is that when copper bars 7 in two adjacent bus duct structures are in butt joint, the ends can be mutually attached, so that split bolts in the existing bus duct structures are omitted;

in addition, the end fitting parts 46 at the two ends of the same copper bar 7 are respectively arranged in the penetrating openings on the joint sealing pieces 3 at the two ends of the groove body structure and penetrate into the closed box body structure.

Because the end fitting part 46 of the end of the copper bar 7 is limited by the through hole, a section of the copper bar 7 penetrating out of the groove body structure cannot be bent; and because the height difference between the clamping part 47 and the end fitting part 46 is smaller than half of the thickness of the copper bars 7, after the end fitting part 46 penetrates into the closed box body structure, the corresponding copper bars 7 in the connected two-end bus duct structure can be mutually fitted, and the mutual fitting and conduction between the two copper bars 7 in butt joint can be realized on the premise of not needing a split bolt.

In addition, referring to fig. 4, since the end fitting portion 46 penetrates into the through hole, the copper bar 7 can be kept stably fixed in the groove structure under the constraint of the circular arc smooth transition portion and the through hole on the copper bar 7, and the movement cannot occur along the length direction of the groove structure.

In order to facilitate the assembly of the tank structure and the closed box structure, connecting pieces 4 are arranged at the outer sides of two ends of the cover plate 1, and the connecting pieces 4 are respectively fixed with the shell 2, the cover plate 1 and the joint sealing piece 3, so that the joint sealing piece 3 and the tank structure form a whole.

As a further aspect of the present invention, referring to fig. 6 to 10, the temperature monitoring mechanism and the power-off protection mechanism are both connected to the thermal expansion driving structure; the thermal expansion driving structure, the power-off protection mechanism and the temperature monitoring mechanism are all arranged in the closed box body structure;

The thermal expansion driving structure comprises a low expansion pipe 8 arranged on the inner wall of the joint sealing piece 3, a temperature sensing piece 9 attached to the end head attaching part 46, a flow guide pipe 10 with one end communicated with the low expansion pipe 8 and a sealing cylinder 11 fixed on the inner wall of the joint sealing piece 3;

the low expansion pipe 8 and the flow guide pipe 10 are filled with flowable temperature sensing agents, and the other end of the flow guide pipe 10 is communicated with the tail end of the sealing cylinder 11; the temperature sensing piece 9 is in a C shape, an inserting piece is integrally arranged at the middle position of the temperature sensing piece 9, and the inserting piece is inserted into the low expansion pipe 8 in a sealing way; the head end of the sealing cylinder 11 is slidably and telescopically provided with a pressure release rod 12, one end of the pressure release rod 12 is positioned in the sealing cylinder 11, and the other end extends out of the sealing cylinder 11;

a plunger is arranged at one end of the pressure release rod 12 in the sealing cylinder 11, and the plunger is in sealing sliding fit with the inner wall of the sealing cylinder 11; an extension piece 13 is fixed at one end of the pressure release rod 12 extending out of the sealing cylinder 11, and the power-off protection mechanism and the temperature monitoring mechanism are both connected with the extension piece 13.

Of course, the "C" type temperature sensing piece 9 has elasticity, so that both sides thereof can be bonded to the surface of the end bonding portion 46; when the copper bar 7 is overloaded and conducts electricity, the heat generated on the surface of the copper bar 7 is necessarily increased, the heat on the surface of the copper bar 7 is conducted to the temperature sensing agent in the low expansion pipe 9 through the temperature sensing piece 9, the temperature of the temperature sensing agent is increased, so that the temperature sensing agent expands, the plunger is pushed to move in the sealing cylinder 11, and then the pressure release rod 12 and the extension piece 13 are driven to move, so that the extension piece 13 moves in a direction away from the sealing cylinder 11.

As a still further aspect of the present invention, please refer to fig. 9, 10, 11, 12, and 13; the temperature monitoring mechanism comprises an extrusion frame 14 fixed below the extension piece 13, a guide sleeve 18 fixed on the inner wall of the joint sealing piece 3, a trigger rod 17 penetrating through the guide sleeve 18 in a sliding manner, and an alarm switch 22 arranged on the inner wall of the joint sealing piece 3;

the extrusion frame 14 is in a right trapezoid shape, and a section of the extrusion frame 14 facing the trigger rod 17 is an isosceles trapezoid-shaped inclined waist edge; the upper end of the trigger rod 17 is provided with a section of cylinder, and a second pulley 16 is rotatably arranged at the top of the cylinder; a first pressure spring 19 is arranged between the lower part of the cylinder and the guide sleeve 18, and the first pressure spring 19 is sleeved outside the trigger rod 17; the second pulley 16 is in rolling engagement with the edge of the press frame 14;

a buzzer 23 is further installed in the joint sealing piece 3, and the buzzer 23 is electrically connected with the alarm switch 22 through a wire; a flat frame 20 is arranged at the lower end of the trigger rod 17, and a movable contact 21 is arranged at the position of the lower part of the flat frame 20 towards an alarm switch 22.

When the extension piece 13 moves in a direction away from the sealing cylinder 11, the extrusion frame 14 is driven to move along, and the inclined waist edge of the extrusion frame 14 is contacted with the second pulley 16; when the extrusion frame 14 moves in a direction away from the sealing cylinder 11, the second pulley 16 is extruded by the inclined waist edge, so that the trigger rod 17 is driven to move downwards under the guiding action of the guide sleeve 18, and the first pressure spring 19 is compressed; when the trigger rod 17 moves downwards, the flat frame 20 is driven to move downwards, and then the movable contact 21 is driven to move downwards;

When the movable contact 21 moves downwards to be in contact with the alarm switch 22, the second pulley 16 moves to the end point of the inclined waist edge of the extrusion frame 14, and the buzzer 23 gives an alarm; after that, the pressing frame 14 continues to move again, and then the second pulley 16 is attached to the lower edge of the pressing frame 14, so that the trigger rod 17 is kept still, that is, the movable contact 21 always triggers the alarm switch 22.

As a still further aspect of the present invention, referring to fig. 11 to 16, the power-off protection mechanism includes a first pulley 15 rotatably mounted at an end of the extension member 13 remote from the seal cylinder 11, a carriage 25 fixed inside the joint seal 3, a slider 24 slidably engaged with the carriage 25, a swing arm 28 having one end rotatably provided at an upper end of the carriage 25, and a tension spring 27 connecting the swing arm 28 and the slider 24;

a sliding groove 26 is vertically formed in the lower portion of the sliding frame 25, the sliding block 24 is slidably arranged in the sliding groove 26, and the rear portion of the sliding block 24 is fixed with the flat frame 20; a rotating shaft 41 is fixed to one end of the swing arm 28, and is rotatably fitted to the upper end of the carriage 25 via the rotating shaft 41.

A pull column is fixedly protruded at the central positions of the sliding block 24 and the swing arm 28, and two ends of the tension spring 27 are respectively hung on the two pull columns; the connector sealing piece 3 is internally fixed with a limiting rod 40, the swinging arm 28 is attached to the limiting rod 40 in an initial state, and a micro-switch assembly is further installed in the connector sealing piece 3 and is connected with a bus duct power supply system.

When the trigger rod 17 moves downwards under the guiding action of the guide sleeve 18, the flat frame 20 is driven to move downwards, the flat frame 20 drives the sliding block 24 to move downwards along the sliding groove 26, so that the tension spring 27 between the two pull columns is further lengthened, and the elasticity of the tension spring 27 is increased.

In the initial state, the swing arm 28 is attached to the stop lever 40, and at this time, the swing arm 28 is slightly biased toward the first pulley 15, that is, the swing arm 28 is biased toward the first pulley 15, and at this time, a small angle (for example, 5 °, 6 °, 7 °) is formed between the swing arm 28 and the plumb line. The first pulley 15 is continuously approaching the swing arm 28 during the movement of the extension 13 in a direction away from the seal cartridge 11; simultaneously, the extrusion frame 14 also moves in a direction continuously far away from the sealing cylinder 11, and the second pulley 16 is extruded by the inclined waist edge of the extrusion frame 14 to drive the trigger rod 17 to move downwards; when the second pulley 16 moves to the end point of the inclined waist edge of the extrusion frame 14, the movable contact 21 turns on the alarm switch 22, and the buzzer 23 gives an alarm; at this time, the flat frame 20 also drives the sliding block 24 to be at the lowest part of the sliding groove 26, and the static elastic potential energy stored by the tension spring 27 reaches the maximum.

After that, the extension piece 13 and the extrusion frame 14 continue to move, the second pulley 16 is attached to the lower edge of the extrusion frame 14, and the movable contact 21 always triggers the alarm switch 22; the first pulley 15 gradually approaches the swing arm 28 until being attached to the swing arm 28; then, the extension piece 13 and the pressing frame 14 continue to move, and the swinging arm 28 is pressed by the first pulley 15, so that the swinging arm 28 deflects around the rotating shaft 41 in a direction deviating from the extension piece 13;

During the deflection of the oscillating arm 28 about the rotation axis 41, the tension spring 27 is stretched still further; when the swing arm 28 deflects to a vertical state, the dynamic elastic potential energy stored by the tension spring 27 reaches the maximum, and the swing arm 28 is at an elastic balance position; after that, the extension piece 13 moves a little more, so that the swing arm 28 is pushed to pass through the balance position by the first pulley 15, and after the swing arm 28 passes through the balance position, the swing arm 28 is driven to swing rapidly under the strong elastic tension of the tension spring 27, and the micro switch assembly is triggered, so that the bus duct power supply system is powered off by the micro switch assembly, and the protection function is achieved.

In summary, in the process, the movable contact 21 triggers the alarm switch 22 to make the buzzer 23 give an alarm, and then the buzzer keeps alarming along with the continuous rising of the temperature; when the temperature rises to the limit temperature, the swing arm 28 is quickly operated, and the bus duct power supply system is powered off through the micro switch assembly.

As a still further aspect of the present invention, referring to fig. 13 and 14, the micro switch assembly is a micro switch 30 installed in the joint seal 3, and the micro switch 30 is provided with a power-off contact 32 and a conductive contact 33 respectively;

A switch key 29 is rotatably installed above the micro switch 30, one side of the switch key 29 is elastically connected with the micro switch 30 through a spring piece 31, and the spring piece 31 is kept in a pressed state;

specifically, the micro switch 30 is connected to an electric brake, which is connected to a bus duct power supply system.

In the initial state, under the elastic force of the elastic sheet 31, the switching key 29 presses the conductive contact 33, the micro switch 30 keeps the electrified state, and then the electric switch is kept in the normally closed state, and finally the bus duct power supply system is electrified; when the swing arm 28 swings to contact with the switch key 29 under the action of the elastic force of the tension spring 27, the swing arm 28 drives the switch key 29 to overcome the elastic force of the elastic sheet 31, so that the switch key 29 is separated from the conductive contact 33 and combined with the power-off contact 32, the micro switch 30 is powered off, and the electric brake is disconnected, so that the bus duct power supply system is powered off.

It is noted that, the sliding block 24 is driven to move downwards in the process of moving the trigger rod 17 downwards, so as to increase the static elastic force of the tension spring 27, so that the tension spring stores larger static elastic potential energy; the function is mainly two, on the one hand, to ensure that the oscillating arm 28 can act rapidly when passing the equilibrium position; on the other hand, in order to ensure that the swing arm 28 can drive the switch key 29 to overcome the elastic force of the elastic sheet 31 and trigger the power-off contact 30 when swinging to contact with the switch key 29.

Although the tension spring 27 is also stretched during the rotation of the swing arm 28 from the position of abutment with the stopper rod 40 to the vertical position (equilibrium position), the amount of stretching is very limited; when the swing arm 28 swings to contact with the power-off contact 32, since the swing arm 28 swings by a larger angle (slightly more than 90 °), the length of the tension spring 27 is shortened by a longer length than that of the balance position, if the slider 24 is not driven to move down, the tension spring 27 needs to have a larger elastic force when in the initial position (the swing arm 28 is attached to the limit lever 40); resulting in the need for the swing arm 28 to overcome a large spring force during the return.

As a still further aspect of the present invention, referring to fig. 15 to 17, the power-off protection mechanism further includes a reset component, where the reset component is used to drive the swing arm 28 to reset to be attached to the limit rod 40; the reset assembly comprises a follow-up frame 34 fixed on one side of the extension piece 13, a toothed plate 35 fixed on the lower part of the follow-up frame 34, a gear 36 rotatably arranged in the joint sealing piece 3 and matched with the toothed plate 35, and a meshing tooth group for connecting the gear 36 and the rotating shaft 41;

the meshing teeth set can only drive in a single direction, and the toothed plate 35 is partially matched with the gear 36; specifically, when the extension piece 13 moves in a direction away from the sealing cylinder 11, the follower 34 drives the toothed plate 35 to move along, and the toothed plate 35 only drives the gear 36 to rotate by a certain angle (for example, 95 °, 96 °, 97 °) due to the limited length of the toothed plate 35, and then the toothed plate 35 is separated from the gear 36; the gear 36 is driven to rotate in the process of combining the toothed plate 35 and the gear 36, and the gear 36 cannot drive the rotating shaft 41 to rotate through the meshing gear set, that is, the swing arm 28 is kept at the current position.

After the bus duct system is powered off, the copper bar 7 starts to radiate heat and cool, and the temperature sensing agent contracts, so that the plunger, the pressure release rod 12, the extension piece 13, the extrusion frame 14, the follow-up frame 34 and the toothed plate 35 move towards the direction close to the sealing cylinder 11 to perform reset movement. In the process, the second pulley 16 rolls along the lower edge of the extrusion frame 14, and when the second pulley 16 rolls along the lower edge of the extrusion frame 14 to the end point of the inclined waist edge of the extrusion frame 14 in a resetting manner, the trigger rod 17 is lifted up under the action of the elastic force of the first pressure spring 19 along with the continuous resetting of the extrusion frame 14 so as to ensure that the second pulley 16 is always attached to the edge of the extrusion frame 14; when the second pulley 16 rotates to be attached to the inclined waist edge of the extrusion frame 14, the movable contact 21 is continuously reset to be separated from the alarm switch 22, and the buzzer 23 releases the alarm;

when the second pulley 16 rolls to the midpoint position of the inclined waist edge of the extrusion frame 14, the toothed plate 35 is reset to be combined with the gear 36, then the gear 36 drives the gear 36 to rotate along with the continuous reset, and the gear 36 drives the rotating shaft 41 to rotate through the meshing tooth group; when the plunger, the pressure release lever 12, the extension member 13, the pressing frame 14, the follower 34, and the toothed plate 35 are completely reset, the toothed plate 35 is first idle and then the gear 36 is driven to rotate by an angle slightly greater than 90 ° (e.g., 95 °, 96 °, 97 °), and the swing arm 28 is reset to be in contact with the stopper rod 40.

During the rolling of the second pulley 16 from the end point of the inclined waist edge of the pressing frame 14 to the midpoint position of the inclined waist edge of the pressing frame 14, the slide block 24 has moved up along the slide groove 26 by half the distance, so that the elastic force of the tension spring 27 is reduced by half; then the gear 36, the meshing teeth group and the rotating shaft 41 drive the swing arm 28 to reset to be attached to the limit rod 40, so that the resistance of the swing arm 28 to reset can be greatly reduced.

As a still further solution of the present invention, referring to fig. 17 and 18, the engaging tooth set includes a first helical tooth clamping wheel 37 coaxially fixed with the gear 36, a second helical tooth clamping wheel 38 coaxially slidably engaged with the rotating shaft 41, and a second compression spring 39 elastically connecting the second helical tooth clamping wheel 38 and the upper end of the carriage 25;

a circle of triangular teeth are arranged on the outer edge of one side surface of the first inclined tooth clamping wheel 37, which is close to the second inclined tooth clamping wheel 38; the outer edge of one side surface of the second inclined tooth clamping wheel 38, which is close to the first inclined tooth clamping wheel 37, is provided with a circle of inverted triangle teeth which are matched with the triangle teeth;

one end of the second compression spring 39 is attached to the second helical gear 38, the other end is attached to the upper side wall of the carriage 25, and the second compression spring 39 is kept under compression.

When the extension piece 13 drives the follower 34 and the toothed plate 35 to be far away from the sealing cylinder 11, the toothed plate 35 drives the gear 36 to rotate, the gear 36 drives the first inclined tooth clamping wheel 37 to rotate, and the triangular teeth on the first inclined tooth clamping wheel 37 cannot drive the inverted triangular teeth on the second inclined tooth clamping wheel 38 to rotate, namely the second inclined tooth clamping wheel 38 cannot rotate in the process;

Referring to fig. 17 and 18, the specific analysis is as follows:

in the initial state, the gear 36 drives the first inclined tooth clamping wheel 37 to rotate when rotating anticlockwise, and the triangular teeth on the first inclined tooth clamping wheel 37 squeeze the inverted triangular teeth on the second inclined tooth clamping wheel 38, so that the second inclined tooth clamping wheel 38 squeezes the second pressure spring 39 to be separated from the second inclined tooth clamping wheel in a yielding way; because the tension spring 27 has an elastic force for pulling the swing arm 28 in the initial state, and the tension of the tension spring 27 is far greater than the elastic force of the second compression spring 39, if the second helical gear 38 is to be driven to rotate anticlockwise by the first helical gear 37, the elastic force of the tension spring 27 must be overcome; the spring force of the tension spring 27 is far greater than that of the second compression spring 39, so that the second helical gear 38 cannot be driven to rotate anticlockwise when the first helical gear 37 rotates anticlockwise;

when the first helical gear 37 drives the second helical gear 38 to rotate clockwise, the force bearing surfaces of the triangular teeth and the inverted triangular teeth are parallel to the axis of the rotating shaft 41, so that no radial component force is generated, and when the gear 36 and the first helical gear 37 rotate clockwise, the second helical gear 38 can be driven to rotate clockwise.

As still further aspect of the present invention, referring to fig. 18, a sliding key 42 is disposed on the surface of the rotating shaft 41 along the axial direction thereof, a jack is disposed in the center of the second helical gear 38 and slidably inserted into the rotating shaft 41, and a key slot 43 slidably engaged with the sliding key 42 is disposed on the inner wall of the jack.

The second helical gear clamping wheel 38 can slide along the axial direction relative to the rotating shaft 41 through the matching of the key groove 43 and the sliding key 42, so that the second helical gear clamping wheel 38 extrudes the second pressure spring 39 to be separated from the first helical gear clamping wheel 37 in a yielding way; while ensuring that no relative rotation between the second helical gear 38 and the shaft 41 occurs.

The invention also provides a protection method of the temperature-sensing protection type bus duct structure, and particularly, when the copper bar 7 in the bus duct structure is overloaded and is conductive, the surface temperature of the copper bar 7 reaches the alarm temperature and sends out an alarm signal;

and when the copper bar in the bus duct structure conducts electricity under ultrahigh load, the surface temperature of the copper bar 7 reaches the alarm temperature and continuously rises, so that the alarm is kept, and when the surface temperature of the copper bar 7 reaches the critical temperature, the bus duct power supply system is powered off, so that the protection function is realized.

The method specifically comprises the following steps:

firstly, pre-expanding, wherein when the copper bar 7 in the bus duct structure is powered off, the temperature sensing agent in the low-expansion pipe 8 is in a normal temperature (for example, 23 ℃) state; when the copper bar 7 in the bus duct structure is electrified and is in a rated current state, the copper bar 7 heats (for example, 40 ℃), the temperature of the surface of the copper bar 7 is conducted into the low-expansion pipe 8 through the temperature sensing piece 9, so that the temperature sensing agent in the low-expansion pipe 8 is expanded and the flow guiding pipe 10 is filled;

Step two, the expansion action, when the copper bar 7 is overloaded and conducting, the temperature of the surface of the copper bar 7 is further increased (for example, 50 ℃), so that the temperature sensing agent is further expanded and discharged into the sealing cylinder 11, and the plunger and the pressure release rod 12 are pushed to further extend out of the sealing cylinder 11 so as to drive the extension piece 13, the extrusion frame 14, the first pulley 15, the follow-up frame 34 and the toothed plate 35 to be far away from the sealing cylinder 11;

the pressing frame 14 drives the trigger rod 17, the flat frame 20 and the movable contact 21 to move downwards under the action of the guide sleeve 18 through the second pulley 16, and presses the first pressure spring 19; the follower 34 and the toothed plate 35 are far away from the sealing cylinder 11 to drive the gear 36 and the first inclined tooth clamping wheel 37 to rotate; but the first helical gear clamping wheel 37 cannot drive the second helical gear clamping wheel 38 to rotate; the flat frame 20 drives the sliding block 24 to slide downwards along the sliding groove 26, so that the tension spring 27 is further stretched, and the elasticity of the tension spring 27 is increased;

step three, triggering an alarm, wherein when the second pulley 16 moves to the end point of the inclined waist edge of the extrusion frame 14 (for example, the surface temperature of the copper bar 7 reaches 55 ℃), the sliding block 24 reaches the lowest part of the sliding groove 26; meanwhile, the movable contact 21 triggers the alarm switch 22, the buzzer 23 is powered on, and an alarm signal is sent out;

step four, power-off protection, wherein when the copper bar 7 conducts electricity under ultrahigh load, the temperature of the surface of the copper bar 7 is further raised (for example, 60 ℃) on the basis of overload conduction, and the temperature sensing agent is further expanded; the extension 13, the pressing frame 14, the first pulley 15, the follower 34, and the toothed plate 35 are further away from the seal cylinder 11;

The second pulley 16 rolls along the lower edge of the extrusion frame 14, the sliding block 24 is kept at the lowest part of the sliding groove 26, and the movable contact 21 always triggers the alarm switch 22; while the first pulley 15 is continuously approaching the swing arm 28; when the first pulley 15 is attached to the swing arm 28, the first pulley 15 presses the swing arm 28 to swing the swing arm 28 in the vertical direction; after the swing arm 28 swings to the vertical position, the swing arm 28 rapidly acts under the action of the tension spring 27 to trigger the power-off contact 32 so as to power off the bus duct power supply system;

step five, cooling and resetting, and gradually cooling the copper bar 7 after power failure; the temperature sensing agent contracts during cooling, so that the plunger, the pressure release lever 12, the extension piece 13, the pressing frame 14, the first pulley 15, the follower 34, and the toothed plate 35 are reset (the toothed plate 35 at this time has passed over the gear 36, and the two are not combined any more);

during the resetting process of the extrusion frame 14, the second pulley 16 rolls from the lower edge of the extrusion frame 14 to the inclined waist edge of the extrusion frame 14 (the surface temperature of the copper bar 7 is reduced to 55 ℃), the contact 21 is separated from the alarm switch 22, and the contact buzzer 23 alarms; simultaneously, the sliding block 24 slides upwards, so that the elastic force of the tension spring 27 is reduced; when the second pulley 16 rolls to the midpoint of the beveled edge of the pressing frame 14 (the surface temperature of the copper bar 7 falls to 50 ℃), the toothed plate 35 starts to mesh with the gear 36; at this time, the sliding block 24 is positioned at the middle position of the sliding groove 26, the elasticity of the tension spring 27 is reduced, and the rotating shaft 41 is driven to reset by the meshing tooth set under the action of the gear 36, so that the swing arm 28 starts to reset, and the conductive contact 33 is powered on again under the action of the elastic sheet 31; when the plunger, the pressure release rod 12, the extension piece 13, the extrusion frame 14, the first pulley 15, the follower 34 and the toothed plate 35 are completely reset, the sliding block 24 is positioned at the highest position of the sliding groove 26; and the swing arm 28 swings to engage the stopper post 40.

The above-described embodiments are illustrative, not restrictive, and the technical solutions that can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention are included in the present invention.

Claims

1. A temperature-sensing protective busway structure, comprising:

the groove body structure is characterized in that two ends of the groove body structure are respectively provided with a joint sealing piece (3), and the interior of the groove body structure is sealed by arranging two joint sealing pieces (3) at the two ends of the groove body structure;

the temperature-sensing protection type bus duct structure is characterized by further comprising copper bars (7), wherein the copper bars (7) are arranged in the duct body structure, and two ends of each copper bar (7) respectively penetrate through joint sealing pieces (3) arranged at two ends of the duct body structure; a through hole for the copper bar (7) to pass through is formed on one surface of the joint sealing piece (3) opposite to the copper bar (7);

when two adjacent bus duct structures are in butt joint installation, two joint sealing pieces (3) in butt joint form a closed box body structure;

the sealed box body structure is internally provided with a temperature monitoring mechanism and a power-off protection mechanism, wherein the temperature monitoring mechanism and the power-off protection mechanism are mutually matched to send out an alarm signal when the surface temperature of the copper bar (7) reaches an alarm value, and power off the copper bar (7) when the surface of the copper bar (7) reaches the trigger temperature of the power-off protection mechanism; the triggering temperature of the power-off protection mechanism is lower than the resetting temperature of the power-off protection mechanism;

The copper bar (7) is provided with three sections of straight parts, and circular arcs among the three sections of straight parts are in smooth transition; the straight parts at the two ends are end fitting parts (46), and the straight part at the middle section is a clamping part (47); the clamping part (47) is clamped with a bayonet on the mica insulator (5);

the end fitting parts (46) at the two ends are respectively positioned at two sides of the clamping part (47), and the height difference between the clamping part (47) and the end fitting parts (46) is smaller than half of the thickness of the copper bar (7); the end fitting parts (46) at two ends of the same copper bar (7) are respectively arranged in the penetrating openings on the joint sealing pieces (3) at two ends of the groove body structure and penetrate into the closed box body structure;

the temperature monitoring mechanism and the power-off protection mechanism are connected with the thermal expansion driving structure; the thermal expansion driving structure, the power-off protection mechanism and the temperature monitoring mechanism are all arranged in the closed box body structure;

the thermal expansion driving structure comprises a low expansion pipe (8) arranged on the inner wall of the joint sealing piece (3), a temperature sensing sheet (9) attached to the end head attaching part (46), a flow guide pipe (10) with one end communicated with the low expansion pipe (8), and a sealing cylinder (11) arranged on the inner wall of the joint sealing piece (3);

The low-expansion pipe (8) and the flow guide pipe (10) are filled with flowable temperature sensing agents, and the other end of the flow guide pipe (10) is communicated with the tail end of the sealing cylinder (11); an inserting sheet is integrally arranged at the middle position of the temperature sensing sheet (9), and the inserting sheet is inserted into the low-expansion pipe (8) in a sealing way; the head end of the sealing cylinder (11) is slidably and telescopically provided with a pressure release rod (12), one end of the pressure release rod (12) is positioned in the sealing cylinder (11), and the other end of the pressure release rod extends out of the sealing cylinder (11);

a plunger is arranged at one end of the pressure release rod (12) positioned in the sealing cylinder (11), and the plunger is in sealing sliding fit with the inner wall of the sealing cylinder (11); one end of the pressure release rod (12) extending out of the sealing cylinder (11) is provided with an extension piece (13), and the power-off protection mechanism and the temperature monitoring mechanism are both connected with the extension piece (13).

2. A temperature-sensitive protective bus duct structure according to claim 1, characterized in that the temperature monitoring mechanism comprises a pressing frame (14) arranged below an extension piece (13), a guide sleeve (18) arranged on the inner wall of the joint sealing piece (3), a trigger rod (17) penetrating through the guide sleeve (18) in a sliding manner, and an alarm switch (22) arranged on the inner wall of the joint sealing piece (3);

The extrusion frame (14) is in a right trapezoid shape, and one section of the extrusion frame (14) facing the trigger rod (17) is an isosceles trapezoid-shaped inclined waist edge; the upper end of the trigger rod (17) is provided with a section of cylinder, and a second pulley (16) is rotatably arranged at the top of the cylinder; a first pressure spring (19) is arranged between the lower part of the cylinder and the guide sleeve (18), and the first pressure spring (19) is sleeved outside the trigger rod (17); the second pulley (16) is in rolling fit with the edge of the extrusion frame (14);

a buzzer (23) is further arranged in the joint sealing piece (3), and the buzzer (23) is electrically connected with the alarm switch (22) through a wire; the lower end of the trigger rod (17) is provided with a flat frame (20), and the lower part of the flat frame (20) is provided with a movable contact (21) towards the position of the alarm switch (22).

3. A temperature-sensitive protective bus duct structure according to claim 2, characterized in that the power-off protection mechanism comprises a first pulley (15) rotatably mounted at one end of the extension member (13) far from the seal cylinder (11), a sliding frame (25) arranged inside the joint seal member (3), a sliding block (24) slidably fitted with the sliding frame (25), a swinging arm (28) rotatably arranged at one end at the upper end of the sliding frame (25), and a tension spring (27) connecting the swinging arm (28) and the sliding block (24);

A sliding groove (26) is vertically formed in the lower portion of the sliding frame (25), the sliding block (24) is arranged in the sliding groove (26) in a sliding mode, and the rear portion of the sliding block (24) is fixed with the flat frame (20); one end of the swing arm (28) is provided with a rotating shaft (41) and is in running fit with the upper end of the sliding frame (25) through the rotating shaft (41);

be provided with gag lever post (40) in joint sealing member (3), swing arm (28) laminating gag lever post (40) under the initial state still installs micro-gap switch assembly in joint sealing member (3), micro-gap switch assembly connects bus duct power supply system.

4. A temperature-sensing protective bus duct structure according to claim 3, characterized in that the micro-switch assembly is mounted in a micro-switch (30) in the joint sealing member (3), and the micro-switch (30) is provided with a power-off contact (32) and a conductive contact (33) respectively;

a switching key (29) is rotatably arranged above the micro switch (30), one side of the switching key (29) is elastically connected with the micro switch (30) through a spring piece (31), and the spring piece (31) is kept in a pressed state; the micro switch (30) is connected with an electric switch, and the electric switch is connected with a bus duct power supply system.

5. A temperature-sensing protective busway structure according to claim 3, wherein the power-off protection mechanism further comprises a reset assembly for driving the swing arm (28) to reset to be attached to the limit rod (40); the reset assembly comprises a follow-up frame (34) arranged on one side of the extension piece (13), a toothed plate (35) arranged on the lower part of the follow-up frame (34), a gear (36) rotatably arranged in the joint sealing piece (3) and matched with the toothed plate (35), and a meshing tooth group used for connecting the gear (36) and the rotating shaft (41); the toothed plate (35) is partially matched with the gear (36).

6. The temperature-sensing protection type bus duct structure according to claim 5, wherein the meshing gear group comprises a first helical gear (37) coaxially arranged with a gear (36), a second helical gear (38) coaxially and slidably matched with the rotating shaft (41), and a second compression spring (39) elastically connecting the second helical gear (38) with the upper end of the carriage (25);

a circle of triangular teeth are arranged on the outer edge of one side surface of the first inclined tooth clamping wheel (37) close to the second inclined tooth clamping wheel (38); a circle of inverted triangle teeth are arranged on the outer edge of the surface, close to the first inclined tooth clamping wheel (37), of the second inclined tooth clamping wheel (38), and the inverted triangle teeth are matched with the triangle teeth;

One end of the second pressure spring (39) is attached to the second helical tooth clamping wheel (38), the other end of the second pressure spring is attached to the upper end side wall of the sliding frame (25), and the second pressure spring (39) is kept pressed.

7. The temperature-sensing protection type bus duct structure according to claim 6, wherein a sliding key (42) is arranged on the surface of the rotating shaft (41) along the axial direction of the rotating shaft, a jack which is slidably inserted into the rotating shaft (41) is arranged in the center of the second inclined tooth clamping wheel (38), and a key groove (43) which is slidably clamped with the sliding key (42) is formed in the inner wall of the jack.

8. A method for protecting a bus duct power supply system by a temperature-sensitive protection type bus duct structure according to any one of claims 1 to 7, wherein when the copper bar in the bus duct structure is overloaded and conductive, the surface temperature of the copper bar reaches an alarm temperature and an alarm signal is sent; when the copper bar in the bus duct structure conducts electricity under ultrahigh load, the alarm is kept as the surface temperature of the copper bar reaches the alarm temperature and continues to rise, and the power supply system of the bus duct is powered off when the surface temperature of the copper bar reaches the critical temperature;

the method is characterized by comprising the following steps of: