Automatic power-off normal pressure switchgear based on overload protection

Abstract

The present invention discloses an automatic power-off normal-pressure switch cabinet based on overload protection, comprising a base and a switch cabinet frame arranged on the base, a cabinet door connected to the front door frame of the switch cabinet frame, an opening and closing connector installed between the switch cabinet frame and the cabinet door, a top frame installed at the top of the switch cabinet frame, an input wire connection terminal installed at the tail of the top frame, the power supply part of the input wire connection terminal end is electrically connected to a power transmission copper rod, and a temperature change is detected by a thermistor and a command is sent to the solenoid valve to cut off the power of the solenoid valve. When the solenoid valve is cut off, the trip rod and the breaking conductive copper rod will be reconnected together under the action of reverse suction to achieve the closure of electric energy. In the whole process, the output wire connection terminal of the normal-pressure switch cabinet will transmit or block electric energy according to the state of the breaking contact, and the heat generated by the normal-pressure switch cabinet during operation will be efficiently dissipated through the heat dissipation mechanism.

Description

Technical Field

[0001] The invention relates to an automatic power-off normal-voltage switch cabinet based on overload protection. Background Art

[0002] Normal-pressure switchgear is an electrical device used to connect, carry and disconnect AC circuits in power systems. The main function of normal-pressure switchgear is to protect the equipment and personal safety in power systems. Normal-pressure switchgear is generally installed in the power distribution cabinet of the power system to distribute and control the power load. According to the occasion and purpose of use, normal-pressure switchgear can be divided into many types, such as small circuit breakers for residential use, high-voltage circuit breakers for industrial use, and high-voltage normal-pressure switchgear for power distribution.

[0003] However, the existing normal-pressure switchgear has some shortcomings in the process of use that need to be improved. First, the tripping mechanism of the existing normal-pressure switchgear is damaged or fails when overloaded, and the protector cannot trip. When the protector cannot trip, there is a lack of secondary disconnection protection mechanism, which may lead to serious overload conditions and, in severe cases, fires. Secondly, when the switchgear is in operation, the electrical components in the cabinet will generate heat, which will cause the temperature inside the switchgear to rise, and then cause the performance of the electrical components to decline, thereby affecting its normal operation and even causing operating accidents. Therefore, we have made improvements to this and proposed an automatic power-off normal-pressure switchgear based on overload protection. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an automatic power-off normal pressure switch cabinet based on overload protection, comprising a base and a switch cabinet frame arranged on the base, a cabinet door being connected to the front door frame of the switch cabinet frame, an opening and closing connector being installed between the switch cabinet frame and the cabinet door, a top frame being installed at the top of the switch cabinet frame, an input wire connection terminal being installed at the tail of the top frame, a power supply part at the end of the input wire connection terminal being electrically connected to a power transmission copper rod, the other end of the power transmission copper rod being connected to a trip rod, an insulator body being arranged below the trip rod, a breaking contact being arranged at the bottom of the insulator body, a thermistor being fixed on the middle section of the inner wall on the left side of the switch cabinet frame, a solenoid valve being connected to the front end of the thermistor, and a breaking conductive copper rod being arranged on the surface of the solenoid valve.

[0005] With the above structure, the base is the basic structure of the normal pressure switch cabinet, which plays a role in supporting the weight of the entire cabinet and provides a stable working environment for various internal components. The switch cabinet frame is the skeleton of the entire cabinet, supporting the base and cabinet door structure, and providing installation space for internal components. The cabinet door is the entry and exit interface of the normal pressure switch cabinet, which is used for the operator to open the cabinet door for inspection, maintenance or replacement of internal components when necessary. The opening and closing connector connects the cabinet door and the switch cabinet frame, so that the cabinet door opens and closes smoothly. The signal indicator light is used to display the electrical status inside the normal pressure switch cabinet. The transparent glass panel is located inside the cabinet door, and the electrical components inside the switch cabinet are observed, which is convenient for the operator to understand the status of the equipment. The top frame is located above the switch cabinet frame and is used to support the heat dissipation hole and the input wire terminal structure. The heat dissipation hole is located on the top frame to dissipate the heat generated by the internal components of the normal pressure switch cabinet to ensure the normal operation of the equipment. The input wire terminal is used to connect the power input terminal of the normal pressure switch cabinet to introduce the power into the cabinet. The transmission copper rod is connected between the input wire terminal and the breaking contact to transmit electrical energy. The trip rod is connected to the power transmission copper rod to control the action of breaking the conductive copper rod. The insulator body is located near the switch contacts and is used to insulate and support the breaking contacts. The breaking contacts are located on the insulator body and are used to achieve the breaking of electric energy.

[0006] As a preferred technical solution of the present invention, a fuse is electrically connected below the thermistor, a conductive rod is installed at the bottom of the fuse, the other end of the conductive rod is connected to an output wire terminal, and a grounding terminal is arranged below the output wire terminal.

[0007] With the above structure, the thermistor is used to detect the temperature inside the normal pressure switch cabinet as the basis for the action of the protection element. The solenoid valve is used to control the action of the trip rod and the breaking conductive copper rod to realize the breaking function of the normal pressure switch.

[0008] As a preferred technical solution of the present invention, a manual switch contact rod is connected to the front end of the grounding terminal, the end of the manual switch contact rod contacts the switch contact, and the switch contact is installed on the right side wall inside the switch cabinet frame.

[0009] With the above structure, the grounding terminal is located near the output wire terminal and is used to connect the grounding terminal of the normal pressure switch cabinet to ensure the safe operation of the equipment.

[0010] As a preferred technical solution of the present invention, a switch cabinet manual switch is electrically installed on the front plate of the switch cabinet frame, a switch wrench is installed on the shaft body in the manual switch groove of the switch cabinet, and the switch wrench is connected to the switch contacts.

[0011] With the above structure, the manual switch contact rod is located on the manual switch of the switch cabinet to operate the opening and closing of the normal pressure switch. The switch contact is located near the manual switch contact rod to realize the opening and closing of the manual switch and to manually disconnect the circuit in an emergency.

[0012] As a preferred technical solution of the present invention, the cabinet doors are longitudinally symmetrical, a signal indicator light is electrically connected to the front panel of the cabinet door, and a transparent glass panel is provided on the front panel of the cabinet door, and the transparent glass panel is made of tempered glass.

[0013] With the above structure, a signal indicator light is electrically connected to the cabinet door front panel for signal indication, and a transparent glass panel is provided on the cabinet door front panel so that the circuit inside the switch cabinet can be effectively seen through the transparent glass panel for easy maintenance.

[0014] As a preferred technical solution of the present invention, it also includes a heat dissipation mechanism, which is arranged at the bottom of the switch cabinet frame; the heat dissipation mechanism includes a heat dissipation box, coolant, and a cooling pipe, the heat dissipation box is provided with a cooling pipe, and the cooling pipe stores coolant.

[0015] With the above structure, a cooling pipe is arranged in the heat dissipation box, and coolant is stored in the cooling pipe to cool the switch cabinet. The coolant in the cooling pipe is connected to an externally connected cold and hot exchanger, thereby realizing the exchange of heat energy.

[0016] As a preferred technical solution of the present invention, a heat conducting sheet is provided at the connection between the heat dissipation box and the base.

[0017] With the above structure, the heat conduction of the heat of the heat dissipation box itself can be improved by providing a heat conducting sheet at the connection between the heat dissipation box and the base.

[0018] As a preferred technical solution of the present invention, a heat sink is provided on the front frame of the top frame, and heat sink holes are provided on the heat sink.

[0019] With the above structure, a heat sink is arranged on the top frame and the front frame, and heat sinks are arranged on the heat sink. Through the heat sinks, the switch cabinet exchanges heat inside the cabinet with the outside.

[0020] As a preferred technical solution of the present invention, the breaking conductive copper rod is inclined to the right at an angle of forty-five degrees, and the breaking conductive copper rod top rod is located on the right side of the breaking contact.

[0021] With the above structure, the contact of the breaking contact point can be effectively facilitated by the breaking conductive copper rod being tilted to the right at an angle of forty-five degrees.

[0022] As a preferred technical solution of the present invention, the opening and closing connectors are arranged in a linear array, and a pin is embedded in the axial hole of each opening and closing connector.

[0023] With the above structure, the stability of the cabinet door during maintenance can be effectively facilitated by arranging the opening and closing connecting members in a linear array. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a main structural diagram of the present invention;

[0025] Figure 2 It is the left sectional structural diagram of the present invention;

[0026] Figure 3 This is a structural diagram of the heat dissipation box of the present invention;

[0027] Figure 4 A top view of the present invention;

[0028] Figure 5 It is a cross-sectional view of the fuse in the present invention. DETAILED DESCRIPTION

[0029] The embodiment of the automatic power-off normal pressure switch cabinet based on overload protection of the present invention is as follows: Figure 1-5 As shown: it includes a base 1 and a switch cabinet frame 2 arranged on the base 1, a cabinet door 3 is connected to the front door frame of the switch cabinet frame 2, an opening and closing connector 4 is installed between the switch cabinet frame 2 and the cabinet door 3, a top frame 7 is installed on the top of the switch cabinet frame 2, an input wire terminal 9 is installed at the tail of the top frame 7, the power supply part of the end of the input wire terminal 9 is electrically connected to a transmission copper rod 10, the other end of the transmission copper rod 10 is connected to a trip rod 11, an insulator body 12 is arranged below the trip rod 11, and a breaking contact 13 is arranged at the bottom of the insulator body 12, a thermistor 14 is fixed on the middle section of the inner wall on the left side of the switch cabinet frame 2, the front end of the thermistor 14 is connected to a solenoid valve 15, and a breaking conductive copper rod 16 is arranged on the surface of the solenoid valve 15.

[0030] A fuse 17 is electrically connected to the bottom of the thermal sensor 14, and a conductive rod 18 is installed at the bottom of the fuse 17. The other end of the conductive rod 18 is connected to the output wire terminal 19, and a grounding terminal 20 is arranged below the output wire terminal 19. A manual switch contact rod 21 is connected to the front end of the grounding terminal 20, and the end of the manual switch contact rod 21 contacts the switch contact 22, and the switch contact 22 is installed on the right side wall inside the switch cabinet frame 2. A switch cabinet manual switch 23 is electrically installed on the front plate of the switch cabinet frame 2, and a switch wrench 24 is installed on the shaft body in the groove of the switch cabinet manual switch 23, and the switch wrench 24 is connected to the switch contact 22. The switch cabinet manual switch 23 can be started by the switch wrench 24 to manually disconnect the circuit in an emergency. The cabinet doors 3 are longitudinally symmetrical, and a signal indicator light 5 is electrically connected to the front plate of the cabinet door 3. A transparent glass panel 6 is arranged on the front plate of the cabinet door 3, and the transparent glass panel 6 is made of tempered glass.

[0031] The fuse 17 includes a fuse housing 171 and a fuse assembly 172 arranged in the fuse housing 171. A ceramic housing 173 is provided between the fuse assembly 172 and the fuse housing 171. Conductive plates 174 are provided on both inner and outer sides of the ceramic housing 173 at the upper and lower ends of the fuse assembly 172, and the inner and outer conductive plates 174 pass through the ceramic housing 173 for electrical connection. The upper and lower ends of the fuse housing 171 are provided with connecting terminals 175 connected to the wires, and a filling portion 176 is further provided between the connecting terminal 175 and the fuse housing 171. A filling chamber is formed in the filling portion 176, and the filling chamber is filled with a sealed conductive material; the connecting terminal 175 is electrically connected to the outer conductive plate 1741 through the filling portion 176, and the fuse assembly 172 is electrically connected to the inner conductive plate 1742.

[0032] The fuse assembly 172 includes a substrate 1721, a fuse 1722 and two connecting elements 1723. The two connecting elements 1723 are respectively connected to the upper and lower sides of the substrate 1721. The fuse 1722 passes through the substrate 1721 and the upper and lower ends of the fuse 1722 extend out of the upper and lower sides of the substrate 1721 and are connected to the connecting elements 1723. Evenly distributed honeycomb welding points are arranged inside the fuse 1722; magnets 1724 are arranged on the left and right sides of the substrate 1721, and the magnetic properties of the two magnets 1724 are consistent; a chamber filled with gas is arranged inside the substrate 1721, and a relay for controlling the switch of the chamber is also arranged on the substrate 1721. The relay is connected in parallel with a section of fuse. When the fuse is blown, the voltage at both ends of the relay changes, so that the switch state of the chamber changes; the substrate is an insulating material.

[0033] The middle part of the inner conductive plate 1742 is convex inwards, the front end of the connecting element 1723 includes an edge part and a middle part, the middle part is concave inwards, and the connection between the edge part and the middle part is an inclined surface. The front end of the connecting element 1723 is adapted to the shape of the inner conductive plate 1742.

[0034] The width of the connecting element 1723 is narrower than the width of the base 1721; a fixing component 28 is provided outside the fuse assembly 172, and the fixing component 28 includes a cover body 281 arranged at the upper and lower ends and a connecting portion 282 in the middle, and the cover body 281 and the connecting portion 282 form a stepped structure adapted to the shape of the fuse assembly 172, and the connecting portion 282 is used to place the fuse assembly 172, and the cover body 281 wraps the connecting element 1723 inside, and a group of grooves 283 are arranged on the connecting portion 282.

[0035] A pressure relief shell 29 is fixedly connected to the outside of the fuse shell 171, a first pressure relief through hole 291 is arranged in the middle of the pressure relief shell 29, a slider 292 is arranged in the pressure relief shell 29 for sliding connection therewith, and gas is stored in the cavity of the slider 292 near the first pressure relief through hole 291; a plurality of evenly distributed second pressure relief through holes 293 are arranged in the middle of the ceramic shell 173, and the second pressure relief through holes 293 penetrate the fuse shell 171 and are connected with the pressure relief shell 29.

[0036] The heat dissipation mechanism 25 is arranged at the bottom of the switch cabinet frame 2; the heat dissipation mechanism 25 includes a heat dissipation box 251, a coolant 252, and a cooling pipe 253. The heat dissipation box 251 is provided with a cooling pipe 253, and the cooling pipe 253 stores the coolant 252. A heat conducting sheet 26 is arranged at the connection between the heat dissipation box 251 and the base 1. A heat dissipation plate is arranged on the front frame of the top frame 7, and a heat dissipation hole 8 is arranged on the heat dissipation plate. The breaking conductive copper rod 16 is tilted to the right at a 45-degree angle, and the top rod of the breaking conductive copper rod 16 is located on the right side of the breaking contact 13. The opening and closing connectors 4 are arranged in a linear array, and a pin is embedded in the axial hole of each opening and closing connector 4.

[0037] The base 1 is the basic structure of the normal-pressure switch cabinet, which plays a role in supporting the weight of the entire cabinet and provides a stable working environment for various internal components. The switch cabinet frame 2 is the skeleton of the entire cabinet, supporting the base 1 and the cabinet door 3 structure, and providing installation space for internal components. The cabinet door 3 is the entry and exit interface of the normal-pressure switch cabinet, which is used for the operator to open the cabinet door 3 to inspect, maintain or replace internal components when necessary. The opening and closing connector 4 connects the cabinet door 3 and the switch cabinet frame 2, so that the cabinet door 3 opens and closes smoothly. The signal indicator 5 is used to display the electrical status inside the normal-pressure switch cabinet. The transparent glass panel 6 is located inside the cabinet door 3, and the electrical components inside the switch cabinet are observed, which is convenient for the operator to understand the status of the equipment. The top frame 7 is located above the switch cabinet frame 2, and is used to support the heat dissipation hole 8 and the input wire terminal 9 structure. The heat dissipation hole 8 is located on the top frame 7, which is used to dissipate the heat generated by the components inside the normal-pressure switch cabinet to ensure the normal operation of the equipment. The input wire terminal 9 is used to connect the power input terminal of the normal-pressure switch cabinet to introduce the power supply into the cabinet. The transmission copper rod 10 is connected between the input wire terminal 9 and the disconnecting contact 13 for transmitting electric energy. The tripping rod 11 is connected to the transmission copper rod 10 for controlling the action of the disconnecting conductive copper rod 16. The insulator body 12 is located near the switch contact 22 for insulating and supporting the disconnecting contact 13. The disconnecting contact 13 is located on the insulator body 12 for realizing the disconnection of electric energy. The thermistor 14 is used to detect the temperature inside the normal pressure switch cabinet as a basis for the action of the protection element. The solenoid valve 15 is used to control the action of the tripping rod 11 and the disconnecting conductive copper rod 16 to realize the disconnecting function of the normal pressure switch. The disconnecting conductive copper rod 16 is connected between the disconnecting contact 13 and the solenoid valve 15 to realize the transmission and disconnecting functions of electric energy. The fuse 17 is located near the disconnecting conductive copper rod 16. When the tripping mechanism of the normal pressure switch cabinet is damaged or fails under overload, the circuit is disconnected by the melting of the fuse 17, thereby realizing the secondary circuit breaking protection of the circuit. The conductive rod 18 is located near the fuse 17 and is used to connect the fuse 17 and the disconnecting contact 13. The output wire terminal 19 is located near the conductive rod 18 and is used to connect the output terminal of the normal pressure switch cabinet to transmit the disconnected electric energy to the external circuit. The grounding terminal 20 is located near the output wire terminal 19 and is used to connect the grounding terminal of the normal pressure switch cabinet to ensure the safe operation of the equipment. The manual switch contact rod 21 is located on the manual switch 23 of the switch cabinet and is used to operate the opening and closing of the normal pressure switch. The switch contact 22 is located near the manual switch contact rod 21 and is used to realize the opening and closing of the manual switch, and is used to manually disconnect the circuit in an emergency.

[0038] The pressure relief housing 29 and the slider 292 provided in the fuse 17 can be used together to prevent the problem that when the fuse 1722 in the fuse 17 melts, gas is generated, which increases the pressure in the fuse 17 and thus causes the fuse 17 to explode.

[0039] When the fuse 17 is damaged, a cover 281 is provided on the fixing assembly 28 to prevent maintenance personnel from accidentally touching the live connecting element 1723. At the same time, a group of grooves 283 are provided on the middle connecting portion 282 to enable maintenance personnel to hook the fixing assembly 28 and the fuse assembly 172 with a hook, thereby avoiding the problem of accidentally touching the fuse 17 with hands and reducing the risk of electric shock for maintenance personnel.

[0040] When the fuse 1722 melts, multiple short fuses are formed, and an arc is often formed between two short fuses. The arc is extinguished under the action of the magnet 1724. At the same time, a chamber for placing gas is provided in the base 1721. When the fuse 1722 melts and an arc is formed, the chamber will automatically open to release gas to extinguish the arc. The dual action of the magnet 1724 and the gas greatly reduces the risk of fire and / or explosion caused by the arc.

[0041] During the use of the present invention, the electromagnetic valve 15 of the normal pressure switch cabinet is first energized. When the electromagnetic valve 15 is energized, the electromagnetic valve 15 generates suction force, so that the trip rod 11 and the disconnecting conductive copper rod 16 are separated. Under the action of the trip rod 11, the disconnecting conductive copper rod 16 will disconnect the connection with the disconnecting contact 13, thereby realizing the disconnection of electric energy. After the disconnecting contact 13 is disconnected, the thermistor 14 will detect the change in temperature and send this information to the overload protection. After receiving the information from the thermistor 14, the overload protection will determine whether the next step of operation is required. If the overload protection determines that the next step of operation is required, it will send an instruction to the electromagnetic valve 15 to disconnect the electromagnetic valve 15. When the electromagnetic valve 15 is disconnected, the trip rod 11 and the disconnecting conductive copper rod 16 will be reconnected together under the action of the reverse suction force to realize the closing of electric energy. During the whole process, the output wire terminal 19 of the normal pressure switch cabinet will transmit or block electric energy according to the state of the disconnecting contact 13. The grounding terminal 20 is always grounded during the whole process to ensure the safe operation of the equipment. The manual switch contact rod 21 is controlled by the overload protection to realize the opening and closing of the normal pressure switch. The switch contact 22 realizes the disconnection of electric energy according to the state of the disconnected conductive copper rod 16. The switch cabinet manual switch 23 is used to realize the disconnection of the manual switch and is used to manually disconnect the circuit in an emergency.

[0042] The above embodiment is only a preferred specific embodiment of the present invention, an automatic power-off normal pressure switch cabinet based on overload protection. The usual changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. An automatic power-off normal-pressure switch cabinet based on overload protection, comprising a base and a switch cabinet frame arranged on the base, characterized in that: A cabinet door is connected to the front door frame of the switch cabinet frame, an opening and closing connector is installed between the switch cabinet frame and the cabinet door, a top frame is installed at the top of the switch cabinet frame, an input wire terminal is installed at the tail of the top frame, the power supply part of the input wire terminal end is electrically connected to a power transmission copper rod, the other end of the power transmission copper rod is connected to a trip rod, an insulator body is arranged below the trip rod, and a breaking contact is arranged at the bottom of the insulator body, a thermistor is fixed on the middle section of the left inner wall of the switch cabinet frame, the front end of the thermistor is connected to a solenoid valve, and a breaking conductive copper rod is arranged on the surface of the solenoid valve; a fuse is electrically connected to the bottom of the thermistor, a conductive rod is installed at the bottom of the fuse, the other end of the conductive rod is connected to the output wire terminal, and a grounding terminal is arranged below the output wire terminal; The fuse includes a fuse housing and a fuse assembly arranged in the fuse housing, a ceramic housing is arranged between the fuse assembly and the fuse housing, the fuse assembly includes a substrate and a fuse, the fuse passes through the substrate and the upper and lower ends of the fuse extend out of the upper and lower sides of the substrate, magnets are arranged on the left and right sides of the substrate, and the magnetic properties of the two magnets are consistent; a chamber filled with gas is arranged in the substrate, and a relay for controlling the switch of the chamber is also arranged on the substrate, the relay is connected in parallel with a section of fuse, when the fuse is blown, the voltage at both ends of the relay changes so that the switch state of the chamber changes; the substrate is an insulating material; A pressure relief shell is fixedly connected to the outside of the fuse shell, a first pressure relief through hole is arranged in the middle of the pressure relief shell, a slider slidably connected to the pressure relief shell is arranged in the pressure relief shell, and gas is stored in the cavity of the slider close to the first pressure relief through hole; a plurality of evenly distributed second pressure relief through holes are arranged in the middle of the ceramic shell, and the second pressure relief through holes penetrate the fuse shell and are connected with the pressure relief shell.

2. The automatic power-off normal pressure switch cabinet based on overload protection according to claim 1 is characterized in that: A manual switch contact rod is connected to the front end of the grounding terminal, the end of the manual switch contact rod contacts the switch contact, and the switch contact is installed on the right side wall inside the switch cabinet frame.

3. The automatic power-off normal pressure switch cabinet based on overload protection according to claim 2 is characterized in that: A switch cabinet manual switch is electrically installed on the front plate of the switch cabinet frame, a switch wrench is installed on the shaft body in the groove of the switch cabinet manual switch, and the switch wrench is connected to the switch contact.

4. The automatic power-off normal pressure switch cabinet based on overload protection according to claim 1 is characterized in that: The cabinet doors are longitudinally symmetrical, a signal indicator light is electrically connected to the front panel of the cabinet door, and a transparent glass panel is arranged on the front panel of the cabinet door. The transparent glass panel is made of tempered glass.

5. The automatic power-off normal-pressure switch cabinet based on overload protection according to claim 1 is characterized in that: It also includes a heat dissipation mechanism, which is arranged at the bottom of the switch cabinet frame; the heat dissipation mechanism includes a heat dissipation box, coolant, and a cooling pipe. The heat dissipation box is provided with a cooling pipe, and the cooling pipe stores coolant.

6. The automatic power-off normal-pressure switch cabinet based on overload protection according to claim 5 is characterized in that: A heat conducting sheet is arranged at the connection between the heat dissipation box and the base.

7. The automatic power-off normal-pressure switch cabinet based on overload protection according to claim 1 is characterized in that: The top frame front frame is provided with a heat dissipation plate, and the heat dissipation plate is provided with heat dissipation holes.

8. The automatic power-off normal-pressure switch cabinet based on overload protection according to claim 1 is characterized in that: The breaking conductive copper rod is inclined to the right at an angle of forty-five degrees, and the breaking conductive copper rod top rod is located on the right side of the breaking contact.

9. The automatic power-off normal-pressure switch cabinet based on overload protection according to claim 1 is characterized in that: The opening and closing connecting pieces are arranged in a linear array, and a pin is embedded in the axial hole of each opening and closing connecting piece.

Images