Multi-channel digital display temperature control circuit breaker

Abstract

The invention relates to the field of power utilization protection equipment, in particular to a multi-channel digital display temperature control circuit breaker. Comprising a shell, a shell cover, an operating rod, a first rectangular ring, a first spring, a center lever, a second rectangular ring, a second spring, a first conductive plate, a wire outlet module, a first bimetal, a C-shaped lever, a second conductive plate, a lower contact, an upper contact, an arc chute, a fixing frame, a wire inlet module, a magnetic pin, a first coil, a third spring, a trigger module and a shunting channel. The shunting channel comprises a circuit board, a contact, a fixed-value resistor, a temperature control assembly and a gauge outfit, the trigger module divides the current in the main circuit to the shunting channel, the current of the shunting channel is positively correlated with the environment temperature, and the change of the current on the first bimetal is opposite to the change of the current on the shunting channel. According to the invention, through a mode of multi-channel shunting and adjusting the shunting size according to the environment temperature, the digital display reminding can be realized before the circuit breaker trips so as to avoid the damage to electric equipment.

Description

Technical Field

[0001] The invention relates to the field of power protection equipment, in particular to a multi-channel digital display temperature control circuit breaker. Background Art

[0002] Electricity has long become an indispensable energy source for human society and is present in all aspects of human life. However, improper use can also bring great risks, such as overload causing line fires, damage to electrical appliances, and even fire hazards. Therefore, power protection equipment has emerged, and circuit breakers are a very common type among them. Circuit breakers can be divided into low-voltage, high-voltage, and special-field types according to their application areas. The high-voltage type is generally used for high-voltage transmission lines. Although it is closely related to daily life, it is not common, and the same is true for the special-field type. Therefore, the present invention focuses on low-voltage circuit breakers that are more common in daily life.

[0003] Low voltage circuit breakers usually have two functions: short circuit protection and overload protection. Figure 1 and Figure 2 When short-circuited, a large amount of current passes through the coil, causing its own magnetism to increase, which in turn causes the magnetic pin to fall to the set position, pushing the center lever and disconnecting the path in the circuit breaker (i.e. "tripping"); when overloaded, the current passing through the coil is not large enough to make the magnetic pin fall to the set position, but the larger current will increase the temperature of the double gold sheet, which will then bend and deform the double gold sheet, involving the C-shaped lever to pull the center lever, thereby causing the circuit breaker to "trip". Obviously, the actual performance of the double gold structure that relies on its own temperature to "trip" is easily affected by the ambient temperature. As a result, when the circuit breaker is overloaded in a low temperature environment, the double gold cannot be fully deformed and "does not trip"; when it is not overloaded in a high temperature environment, the double gold is excessively deformed and "trips by mistake". Long-term "no tripping" will increase the accident rate, which is not conducive to electrical safety, and the excessive current in this process will damage electrical appliances, which is not conducive to electrical safety; and although "false tripping" will not induce accidents, frequent tripping will also aggravate the damage to electrical appliances. Therefore, the prior art adds a temperature compensation device to the low-voltage circuit breaker to make the circuit breaker more sensitive and avoid the influence of temperature within a certain range, thereby ensuring the safety of electricity and electrical appliances. For example, in the patent with publication number CN106169400B, the auxiliary double metal is used to compensate the influence of temperature on the main double metal to ensure the stability of the circuit breaker under various ambient temperatures.

[0004] The existing technology relies on a purely mechanical structure to achieve temperature compensation, and its function is relatively simple. It can only make the double metal trigger the "trip" more stably and stabilize the overload protection function of the circuit breaker, but it cannot give an external warning before the "trip" to avoid the occurrence of the "trip". "Tripping" itself is harmful to a certain extent, especially in factories with hot weather and lack of heat dissipation, the probability of tripping will increase significantly, and its harmfulness is mainly manifested as follows: on the one hand, some high-power machines need to be started and stopped gradually, and sudden power outages will cause the machine's stopping steps to be out of order and cause machine damage. On the other hand, restarting the machine after the "trip" is time-consuming and labor-intensive, which is not conducive to improving production efficiency.

[0005] In order to enable the temperature compensation device to have an early warning function while realizing basic functions, a multi-channel digital display temperature control circuit breaker is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a multi-channel digital display temperature-controlled circuit breaker, which solves the problem that the existing circuit breaker can only disconnect the circuit in a single manner, but cannot give an early warning to avoid tripping, thereby damaging electrical equipment. Through multi-channel shunting and adjusting the shunting size according to the ambient temperature, the circuit breaker can detect the circuit overload state to give an early warning while having a temperature compensation function, thereby avoiding tripping to protect electrical equipment.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A multi-channel digital display temperature-controlled circuit breaker comprises a shell, a shell cover, a joystick, a first rectangular ring, a first spring, a central lever, a second rectangular ring, a second spring, a first conductive plate, an outlet module, a first double metal, a C-shaped lever, a second conductive plate, a lower contact, an upper contact, an arc extinguishing grid, a fixing frame, an incoming module, a magnetic pin, a first coil, a third spring, a trigger module, and a shunt channel. The shunt channel comprises a circuit board, a contact, a fixed value resistor, a temperature control component, and a meter. The trigger module is connected below the magnetic pin, and the circuit board is installed on the right side of the first conductive plate. The contact, the fixed value resistor, the temperature control component, and the meter are electrically connected to the circuit board in sequence from left to right, and the meter displays the current on the shunt channel in real time.

[0009] When the current in the total circuit reaches a set value, the trigger module contacts the contacts and diverts the current in the total circuit to a shunt channel. When the current in the total circuit is stable, the current in the shunt channel is adjusted by the temperature control component and is positively correlated with the ambient temperature. The change trend of the current on the first pair of metals is opposite to that of the shunt channel.

[0010] Most of the existing temperature compensation devices add additional structures to make it easier for the double gold to trip when the low-temperature deformation is insufficient, and more difficult to trip when the high-temperature deformation is excessive. However, such a structural design is complex and requires high precision, so the complexity and precision of the installation are also increased, resulting in reduced production efficiency. Moreover, the difficulty of installation will make it difficult to ensure the quality of the product, and it is difficult to maintain uniformity in its actual use effect, so there are differences in the protection functions of the circuit and electrical appliances. In this scheme, the circuit shunting method is adopted, and the channel where the first double gold is located is used as the main current channel, and another shunt channel is configured as the auxiliary current channel. The current divided by the shunt channel will be positively correlated with the ambient temperature, that is, when the main current is constant, the lower the ambient temperature, the greater the current passing through the first double gold, and the higher the ambient temperature, the smaller the current passing through the first double gold. As a result, the deformation of the first double gold in a low-temperature environment is increased, making it easier for the first double gold to trigger a trip; the deformation of the first double gold in a high-temperature environment is reduced, making it less likely for the first double gold to trigger a trip. This function can be realized with only one circuit board. Compared with the complicated installation of existing temperature compensation devices and the various problems caused by the complicated installation, this solution has absolute advantages. While realizing temperature compensation, the circuit board also provides installation conditions for various electrical components.

[0011] Preferably, the regulation of the current on the shunt channel with respect to the ambient temperature is achieved through a temperature control component. The temperature control component is an NTC thermistor, and the resistance of the NTC thermistor decreases as the ambient temperature increases. According to I=U / R, the current on the shunt channel increases as the ambient temperature increases, thereby compensating for the insufficient deformation of the first double metal at low temperatures and reducing its excessive deformation at high temperatures, so as to achieve temperature compensation, thereby protecting electricity and electrical appliances. In addition, in the circuit, high-temperature environments are more common than low-temperature environments. In order to make the shunt channel work better in a low-temperature environment (so that the current is smaller at low temperatures), the maximum resistance of the temperature control component is not less than 5 times the minimum resistance. The temperature control component and the first double metal will both emit heat when working, so the temperature control component is arranged on the side away from the first double metal, so as to avoid the mutual influence of the temperature of the temperature control component and the first double metal, so as to cause the insensitivity of the circuit breaker and affect its safety performance.

[0012] Preferably, the resistance of the fixed resistor is not less than the minimum resistance of the temperature control component, and the fixed resistor is connected in series with the temperature control component. The shunt channel is used as an auxiliary channel to achieve temperature compensation for the main channel where the first double metal is located. Its own current should not be too large, so there should be a basic resistance in the shunt channel. If this basic resistance is placed on the temperature control component, it will inevitably cause the temperature control component to generate a lot of heat, and then its resistance will be affected by the change of temperature. Therefore, by arranging additional fixed resistors, the current limiting of the shunt channel is achieved, and the heat generated by the temperature control component is shared, so that it can work more stably.

[0013] Short circuit protection and overload protection are the most basic functions of circuit breakers. Even with the existing temperature compensation device, it is also a perfection of its basic functions. However, no matter how sensitive and stable the tripping action is, tripping is inevitable, especially for factories that lack circuit design under extreme temperatures. In hot weather, tripping will occur more frequently. Although the electrical appliances in the factory may be equipped with power-off protection devices, the role of the device is limited, and the maintenance work caused by tripping will greatly reduce production efficiency. In addition, if the problem is simply solved by replacing a larger-sized circuit breaker at this time, it is easy to cause difficulties in level matching (that is, the upper-level switch trips across the level when the lower-level fault occurs), causing a greater risk of accidents. In order to extend the service life of electrical appliances and ensure production efficiency, power outages caused by tripping should be avoided as much as possible. In this solution, the update of the circuit breaker working logic is realized by adding a digital display function, so that it can detect the trend of circuit overload before tripping.

[0014] Preferably, the current value in the shunt channel is measured by the meter head to determine the load condition of the shunt channel so as to reasonably plan the power consumption and prevent tripping caused by overload. The meter head is connected in series with the fixed value resistor and the temperature control component. The meter head includes a meter body, a dial, and a needle. The dial is provided with color indication and text indication. On the one hand, the safety condition of the current circuit can be directly judged by the color indication; on the other hand, the power consumption can be accurately planned by the specific text indication.

[0015] The shunt channel itself will also generate a certain amount of power consumption, so the shunt channel cannot be kept powered on to save energy. In this solution, a trigger module is set up so that when the total current on the main line reaches the set value (close to the overload value), the shunt channel can be connected through the trigger module to perform temperature compensation and digital display.

[0016] Preferably, the contact includes a fourth spring and a conductive sheet. The fourth spring is inserted into the circuit board, and the fourth spring is connected in series with the fixed resistor, the temperature control component, and the meter head. On the one hand, the contact between the gear and the first rack is discontinuous, so the action of the trigger module is intermittent, and the fourth spring can buffer the temporary separation between itself and the right arm caused by this intermittent by its own deformation, so that the current in the shunt channel is stable to better protect the safety of electricity use; on the other hand, it can accelerate the speed at which the shunt channel is disconnected from the circuit. The conductive sheet is connected to the upper end of the fourth spring, and the trigger module includes a trigger lever, a support rod, and a gear. The trigger lever includes a fulcrum, a left arm, and a right arm. The fulcrum is hinged on the shell, and the left arm and the right arm are respectively located on the left and right sides of the fulcrum, and the length of the left arm is greater than that of the right arm.

[0017] Preferably, the support rod includes a main body, an upper supporting part, a conductive part, and a first rack. A fixing frame and a pillar are arranged on the housing. The main body is inserted into the fixing frame. The upper supporting part, the conductive part, and the first rack are arranged on the main body from bottom to top. A protrusion is arranged on the right side of the second conductive plate. The protrusion is arranged in an arc structure. The small contact area reduces friction and avoids the influence of thermal bending on the first double metal. The protrusion presses against the conductive part, so that the current is diverted through the conductive part.

[0018] Preferably, the magnetic pin includes a counterweight portion and a stretching rod portion from top to bottom, and the stretching rod portion includes a cylindrical portion and a square column portion from top to bottom. The square column portion makes processing more convenient, and there is no need to perform milling on the entire stretching rod portion. The side edges of the square column portion are rounded. A second rack is provided inside the square column portion, and the processing of the second rack is easier to complete on the plane provided by the square column.

[0019] Preferably, the upper supporting part is located below the left arm, and the left and right edges of the upper supporting part are rounded to make the contact between the upper supporting part and the trigger lever smoother, ensuring the life of the structure while making the linkage between the structures smoother. The gear is installed below the fixed frame, and the first rack and the second rack are both meshed with the gear, and the number of teeth of the first rack is smaller than that of the second rack, so that the upward distance of the support rod is limited, thereby controlling the downward pressure of the fourth spring, on the one hand to extend the life of the spring, and on the other hand to prevent the downward movement of the magnetic pin from being subject to excessive resistance, resulting in tripping delay or no tripping. When the circuit is close to overload, that is, when the current in the circuit reaches the set value, the magnetic pin will be subjected to the set magnetic force and produce a corresponding downward movement, so that the shunt channel is energized. When the circuit is in a safe state, the shunt channel will be disconnected, thereby better extending the life of the shunt channel and also reducing energy consumption.

[0020] Preferably, the first rack and the second rack have the same width, and the width of the first rack and the second rack is smaller than the width of the gear. On the one hand, compared with the rack, the gear bears greater force and torque and is more susceptible to damage, so its life is extended by increasing the width; on the other hand, the gear is wider than the rack, which can form a positioning for the square column, making the meshing of the rack and the gear more stable.

[0021] Preferably, a through hole is provided at the lower end of the fixing frame, the through hole is located on the projection of the contour of the third spring in the vertical direction of the fixing frame, and the through hole is arranged at the position where the lower end of the third spring and the fixing frame are not in contact, the through hole is fitted with the first rack going up, the third spring can buffer the first rack going up, and can also accelerate its downward movement, so that the meshing between the rack and the gear is tighter, and the upward stroke of the first rack is longer, which is conducive to the stable triggering of the contact. The distance from the upper end surface of the first rack to the lower end of the third spring is not greater than the upward stroke of the first rack, so that the first rack going up can be buffered and accelerated by the third spring.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention provides a temperature compensation function for the circuit breaker by setting a temperature control component in the shunt channel, and enhances the stability of the compensation by connecting it in series with a fixed value resistor and a meter head, and also enables the shunt channel to have an overload detection function. As a result, the circuit breaker can trip more stably to protect electricity consumption, and can also avoid tripping to a certain extent by detecting and giving advance warnings, thereby protecting the safety of electrical appliances and ensuring production efficiency.

[0024] 2. The present invention realizes current limiting of the shunt channel by connecting a fixed value resistor and a temperature control component in series on the shunt channel, so as to avoid the arc risk caused by controlling excessive current. At the same time, the temperature control component reduces its own heat generation by means of voltage division, thereby making the temperature control function more stable.

[0025] 3. In the present invention, by setting the through hole of the fixing frame, the number of teeth of the first rack can be set to be more, so that the upward stroke of the support rod is more sufficient, so as to drive the trigger lever to contact with the contact more closely, so that the shunt circuit is energized stably, and thus the stability of the circuit breaker function is ensured; the support rod can also contact with the third spring. Under the elastic force of the third spring, the first rack and the gear are more closely engaged, and then the gear and the second rack are closely engaged, thereby making the downward movement of the magnetic pin stable and reducing the impact between the gear and the rack, so as to ensure the durability of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the circuit breaker structure in the prior art;

[0027] Figure 2 It is a circuit breaker overload tripping state diagram in the prior art;

[0028] Figure 3 It is a schematic diagram of the overall front view structure of the present invention;

[0029] Figure 4 It is a schematic diagram of the structure of the table header of the present invention;

[0030] Figure 5 It is a schematic diagram of the overall isometric structure of the present invention;

[0031] Figure 6 For the present invention Figure 5 Schematic diagram of the structure of part B;

[0032] Figure 7 For the present invention Figure 5 Schematic diagram of the structure of part C;

[0033] Figure 8 This is a diagram of the connected state of the shunt channel of the present invention.

[0034] In the figure: 1, housing; 101, fixing frame; 102, pillar; 2, housing cover; 3, joystick; 4, first rectangular ring; 5, first spring; 6, center lever; 7, second rectangular ring; 8, second spring; 9, first conductive plate; 10, outlet module; 11, first double metal; 12, C-shaped lever; 13, second conductive plate; 131, protrusion; 14, lower contact; 15, upper contact; 16, arc extinguishing grid; 17, fixing frame; 171, through hole; 18, incoming module; 19, magnetic pin; 191, counterweight; 192, extension rod; 1921, cylindrical; 1922, square column; 19221, second rack; 20, The first coil; 21. The third spring; 22. The trigger module; 221. The trigger lever; 2211. The fulcrum; 2212. The left arm; 2213. The right arm; 222. The support rod; 2221. The main body; 2222. The upper support part; 2223. The conductive part; 2224. The first rack; 223. The gear; 23. The shunt channel; 231. The circuit board; 232. The contact; 2321. The fourth spring; 2322. The conductive sheet; 233. The fixed resistor; 234. The temperature control component; 235. The meter head; 2351. The meter body; 2352. The dial; 23521. The color indication; 23522. The text indication; 2353. The pointer. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figures 1 to 8 The present invention provides a multi-channel digital display temperature control circuit breaker, and the technical solution is as follows:

[0037] A multi-channel digital display temperature control circuit breaker includes a shell 1, a shell cover 2, a joystick 3, a first rectangular ring 4, a first spring 5, a center lever 6, a second rectangular ring 7, a second spring 8, a first conductive plate 9, an outlet module 10, a first double metal 11, a C-shaped lever 12, a second conductive plate 13, a lower contact 14, an upper contact 15, an arc extinguishing grid 16, a fixing frame 17, an incoming module 18, a magnetic pin 19, a first coil 20, a third spring 21, a trigger module 22, and a shunt channel 23. The shell 1 and the shell cover 2 are integrally formed by injection molding, and in order to ensure safety, the shell 1 and the shell cover 2 are connected in a non-detachable manner. During assembly, the position of the first double metal 11 should be adjusted to a suitable position by the bolts connected to its left side to well adapt to the working environment. In this method, the current on the first double gold 11 after the shunt channel 23 is shunted is less than the total current of the main line, so at this time, the sensitivity of the first double gold 11 to trigger the tripping should be appropriately increased, so that when the total current of the main line is in the overload range, the circuit breaker can be disconnected in time. Therefore, the first double gold 11 is appropriately adjusted downward by bolts. The second conductive plate 13 is responsible for transmitting the current of the main line to the main channel where the first double gold 11 is located and the shunt channel 23, and the stability of its connection with the first double gold 11 must be ensured. The C-shaped lever 12 is fixedly connected to the contact end of the center lever 6, and is not connected to the contact point with the first double gold 11, so as to avoid the influence on the deformation of the first double gold 11. The shunt channel 23 includes a circuit board 231, a contact 232, a fixed resistor 233, a temperature control component 234, and a meter 235. The trigger module 22 is connected below the magnetic pin 19. The circuit board 231 is installed on the right side of the first conductive plate 9. A conductive material is arranged on the contact surface between the circuit board 231 and the first conductive plate 9. Moreover, more electrical components can be installed on the circuit board 231 to achieve more functions, such as connecting a wireless module to achieve remote alarm when the shunt channel 23 is connected. The contact 232, the fixed resistor 233, the temperature control component 234, and the meter 235 are electrically connected to the circuit board 231 from left to right, and the meter 235 displays the current on the shunt channel 23 in real time.

[0038] When the current in the total circuit reaches a set value, the trigger module 22 contacts the contact 232 and diverts the current in the total circuit to the shunt channel 23. When the current in the total circuit is stable, the current in the shunt channel 23 is adjusted by the temperature control component 234 and is positively correlated with the ambient temperature. The change trend of the current on the first double metal 11 is opposite to that of the shunt channel 23.

[0039] As an embodiment of the present invention, refer to Figure 3, the regulation of the current on the shunt channel 23 with respect to the ambient temperature is achieved through the temperature control component 234. The temperature control component 234 is an NTC thermistor, and the resistance of the NTC thermistor decreases as the ambient temperature increases. According to I=U / R, the current on the shunt channel 23 increases as the ambient temperature increases, thereby compensating for the insufficient deformation of the first double metal 11 at low temperatures and reducing its excessive deformation at high temperatures, so as to achieve temperature compensation, thereby protecting electricity and electrical appliances. Moreover, the resistance of the fixed resistor 233 is not less than the minimum resistance of the temperature control component 234, and the fixed resistor 233 and the temperature control component 234 are kept in series. The shunt channel 23 is used as an auxiliary channel to achieve temperature compensation for the main channel where the first double gold 11 is located. The current itself should not be too large, so there should be a basic resistance in the shunt channel 23. If this basic resistance is placed on the temperature control component 234, it is bound to cause the temperature control component 234 to generate a lot of heat, and then its resistance is affected by the change of temperature. Therefore, through the arrangement of the additional fixed value resistor 233, the current limiting of the shunt channel 23 is achieved, and the heat generated by the temperature control component 234 is shared, so that it works more stably. In addition, in the circuit, high temperature environment is more common than low temperature environment. In order to make the shunt channel 23 work better in a low temperature environment (so that the current is smaller at low temperature), the maximum resistance of the temperature control component 234 is not less than 5 times the minimum resistance. The first double gold 11 will emit heat when working, so the temperature control component 234 is arranged on the side away from the first double gold 11 and keeps a certain distance from the fixed value resistor 233, so as to avoid the first double gold 11 and the fixed value resistor 233 from affecting their own temperature, so as to improve the stability of the circuit breaker. When using the NTC thermistor and the fixed value resistor 233, they should be reasonably selected according to the allowable current of the shunt channel 23. In this mode, the allowable current of the shunt channel 23 is 0-2.5A, so in order to leave a margin, the fixed value resistor 233 is 100Ω, the minimum resistance of the NTC thermistor is 100Ω, and the maximum resistance is 500Ω.

[0040] As an embodiment of the present invention, refer to Figure 4, the current value in the shunt channel 23 is measured through the meter head 235, and the load condition of the shunt channel 23 is judged to reasonably plan the circuit, thereby preventing tripping caused by overload. The meter head 235 is connected in series with the fixed value resistor 233 and the temperature control component 234. The meter head 235 includes a meter body 2351, a dial 2352, and a needle 2353. The dial 2352 is provided with a color indication 23521 and a text indication 23522. The color indication 23521 is divided into two groups, which are used for low temperature environment (outer circle) and high temperature environment (inner circle), respectively, and has three colors: red, yellow, and green. Green represents absolute safety, and the circuit has a large load margin; yellow represents transition, and as the area of ​​the yellow area swept by the needle 2353 increases, the circuit's load margin gradually decreases; red represents danger, and the circuit has a tendency to be overloaded. On the one hand, the safety condition of the current circuit can be directly judged through the color indication 23521; on the other hand, the power consumption can be accurately planned through the specific text indication 23522. The digital display function alone may not be able to promptly feedback the circuit overload trend to the outside world, so a buzzer can be added to the external meter 235 to achieve early warning, thereby better avoiding tripping caused by overload.

[0041] As an embodiment of the present invention, refer to Figure 5 and Figure 6 The contact 232 includes a fourth spring 2321 and a conductive sheet 2322. The fourth spring 2321 is inserted into the circuit board 231, and the fourth spring 2321 is connected in series with the fixed resistor 233, the temperature control component 234, and the meter head 235. On the one hand, the meshing between the gear 223 and the first rack 2224 is discontinuous, so the action of the trigger module 22 is intermittent, and the fourth spring 2321 can buffer the temporary separation between itself and the right arm 2213 caused by this intermittent by its own deformation, so that the current of the shunt channel 23 is stable to better protect the safety of electricity use; on the other hand, it can accelerate the speed of disconnecting the shunt channel 23 from the circuit. The conductive sheet 2322 is connected to the upper end of the fourth spring 2321, and their connection method is similar to the negative terminal in the battery compartment of the remote control. The trigger module 22 includes a trigger lever 221, a support rod 222, and a gear 223. The trigger lever 221 includes a fulcrum 2211, a left arm 2212, and a right arm 2213. The fulcrum 2211 is hinged on the shell 1, and the left arm 2212 and the right arm 2213 are respectively located on the left and right sides of the fulcrum 2211, and the length of the left arm 2212 is greater than the right arm 2213, so that the support rod 222 can trigger the contact 232 more labor-saving, so as to avoid interference with the downward movement of the magnetic pin 19 and ensure the normal basic functions of the circuit breaker. In addition, the longer left arm 2212 makes the center of the trigger lever 221 biased to the left, so that the right side is separated from the contact 232 in a natural state.

[0042] As an embodiment of the present invention, refer to Figures 5 to 7The support rod 222 includes a main body 2221, an upper support portion 2222, a conductive portion 2223, and a first rack 2224. The housing 1 is provided with a fixed frame 101 and a pillar 102. The main body 2221 is inserted into the fixed frame 101. The upper support portion 2222, the conductive portion 2223, and the first rack 2224 are arranged on the main body 2221 from bottom to top. A protrusion 131 is provided on the right side of the second conductive plate 13. The protrusion 131 is set as an arc structure. The small contact area reduces friction and avoids the influence of the first double gold 11 being bent by heat. The protrusion 131 presses against the conductive portion 2223, thereby realizing shunting through the conductive portion 2223. As the name implies, the conductive portion 2223 is conductive. In order to make the power source of the shunting channel 23 unique, most of the support rod 222 should be insulated, and only the conductivity from the conductive portion 2223 to the contact point with the trigger lever 221 is maintained. The second conductive part 2223 has a certain flexibility. On the one hand, it can be deformed along with the deformation of the first double metal 11; on the other hand, it can make the contact with the conductive part 2223 closer, so as to better transmit electricity.

[0043] As an embodiment of the present invention, refer to Figure 5 and Figure 7 The magnetic pin 19 includes a counterweight portion 191 and a stretching rod portion 192 from top to bottom. The stretching rod portion 192 includes a cylindrical portion 1921 and a square column portion 1922 from top to bottom. The setting of the square column portion 1922 makes processing more convenient, and there is no need to perform milling processing on the entire stretching rod portion 192. In actual processing, in order to save costs, the square column portion 1922 is as short as possible while achieving the function of pushing the support rod 222 upward. The side edges of the square column portion 1922 are rounded, so that it can maintain a sliding connection with the fixed frame 17 more smoothly. A second rack 19221 is provided inside the square column portion 1922, and the processing of the second rack 19221 is easier to complete on the plane provided by the square column.

[0044] As an embodiment of the present invention, refer to Figure 6 and Figure 7The upper support part 2222 is located below the left arm 2212, and the left and right edges of the upper support part 2222 are rounded to make the contact between the upper support part 2222 and the trigger lever 221 smoother, ensuring the life of the structure while making the linkage between the structures smoother. The gear 223 is installed below the fixed frame 17, and the first rack 2224 and the second rack 19221 are both meshed with the gear 223, and the number of teeth of the first rack 2224 is less than that of the second rack 19221, so that the upward distance of the support rod 222 is limited, thereby controlling the downward pressure of the fourth spring 2321, on the one hand, extending the life of the spring, and on the other hand, preventing the downward movement of the magnetic pin 19 from excessive resistance, resulting in delayed tripping or no tripping. The widths of the first rack 2224 and the second rack 19221 are the same, and the widths of the first rack 2224 and the second rack 19221 are less than the widths of the gear 223. On the one hand, compared with the rack, the gear 223 is subjected to greater force and torque and is more susceptible to damage, so its life is extended by increasing its width; on the other hand, the gear 223 is wider than the rack, which can form a positioning for the square column 1922, so that the meshing of the rack and the gear 223 is more stable. During manufacturing, in order to avoid friction between the end face of the gear 223 and the rack groove surface, multiple flush protrusions 131 can be arranged on the end face of the gear 223. When the circuit is close to overload, that is, when the current in the circuit reaches the set value, the magnetic pin 19 will be subjected to the set magnetic force and produce a corresponding downward movement to drive the second rack 19221 upward, lift the left end so that the right end contacts the contact 232, and then energize the shunt channel 23. When the circuit is in a safe state, the travel of the first rack 2224 to drive the second rack 19221 upward is not enough to make the right end contact the contact 232, so the shunt channel 23 will be disconnected, thereby better extending the life of the shunt channel 23 and reducing the power consumption.

[0045] As an embodiment of the present invention, refer to Figure 7 , a through hole 171 is provided at the lower end of the fixing frame 17. For the convenience of drilling, the through hole 171 is set as a circular hole in this method. The through hole 171 is located on the projection of the outline of the third spring 21 in the vertical direction of the fixing frame 17, and the through hole 171 is set at the position where the lower end of the third spring 21 and the fixing frame 17 are not in contact. The through hole 171 fits the first rack 2224 on the upper side. Therefore, when manufacturing the fixing frame 17, the position of the through hole 171 is first determined, and then the contact position of the third spring 21 is selected. The third spring 21 can buffer the first rack 2224 on the upper side, and can also accelerate its downward movement, so that the meshing between the rack and the gear 223 is tighter, and the upward travel of the first rack 2224 is longer, which is conducive to the stable triggering of the contact 232. The distance from the upper end surface of the first rack 2224 to the lower end of the third spring 21 is not greater than the upward stroke of the first rack 2224 , so that the upward first rack 2224 can be buffered and accelerated by the third spring 21 .

[0046] Working principle: By increasing the current channel, two basic problems are first solved: one is that when the circuit breaker is in a low temperature environment, the first pair of gold 11 is affected by temperature and is difficult to deform due to heat, which leads to the first pair of gold 11 being unable to fully deform to trigger tripping when the circuit is overloaded, that is, "no tripping"; the other is that when the circuit breaker is in a high temperature environment, the first pair of gold 11 is affected by temperature and deforms excessively, which leads to the first pair of gold 11 triggering tripping in advance when the circuit is not overloaded, that is, "false tripping".

[0047] The solution is as follows: divide the original circuit channel into two, and connect the two channels in parallel. Among them, the original structure including the first double gold 11 is the main channel, passing a large amount of current; the other is an auxiliary channel, called the shunt channel 23. Affected by the temperature control component 234, the current on the shunt channel 23 is positively correlated with the ambient temperature. From this, a specific solution is derived: in a low temperature environment, the shunt channel 23 divides less current, and the main channel passes more current, thereby causing more heat to be generated on the first double gold 11, so that it can produce sufficient deformation, thereby avoiding the first double gold 11 from "not tripping" due to insufficient deformation when the temperature is low. In a high temperature environment, the shunt channel 23 divides more current, and the main channel passes less current, thereby causing the first double gold 11 to generate less heat, so as to avoid "false tripping" caused by excessive deformation.

[0048] On the basis of the temperature compensation function, the shunt channel 23 is further optimized by adding a fixed value resistor 233 and a meter head 235, respectively, so that the circuit breaker temperature compensation is more stable and has a digital display function. The meter head 235 is connected in series with the shunt channel 23, and can display the current of the shunt channel 23 in real time, providing information reference for the outside world.

[0049] Reference Figure 5 and Figure 8 In order to reduce the power consumption of the shunt channel 23, it is only connected when the circuit is close to overload. The design is as follows: the downward movement of the magnetic pin 19 is due to the magnetic attraction of the first coil 20, and the stronger the current in the circuit, the greater the downward distance of the magnetic pin 19. Therefore, when the descending distance of the magnetic pin 19 reaches the set value (that is, the current in the circuit is close to overload at this time), the shunt channel 23 is connected through the trigger module 22. The downward movement of the magnetic pin 19 serves as the power of this set of actions. When the magnetic pin 19 descends, the support rod 222 is driven upward through the connection between the first rack 2224, the second rack 19221 and the gear 223, thereby lifting the left arm 2212 of the trigger lever 221, and then the right arm 2213 is moved downward and contacts with the contact 232 on the circuit board 231, so that the shunt channel 23 is energized.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-channel digital display temperature control circuit breaker, comprising a housing (1), a housing cover (2), a joystick (3), a first rectangular ring (4), a first spring (5), a central lever (6), a second rectangular ring (7), a second spring (8), a first conductive plate (9), an outlet module (10), a first double metal (11), a C-shaped lever (12), a second conductive plate (13), a lower contact (14), an upper contact (15), an arc extinguishing grid (16), a fixing frame (17), an incoming module (18), a magnetic pin (19), a first coil (20), and a third spring (21), characterized in that: It also includes a trigger module (22) and a shunt channel (23), wherein the shunt channel (23) includes a circuit board (231), a contact (232), a fixed value resistor (233), a temperature control component (234), and a meter (235), wherein the trigger module (22) is connected below the magnetic pin (19), the circuit board (231) is installed on the right side of the first conductive plate (9), the contact (232), the fixed value resistor (233), the temperature control component (234), and the meter (235) are electrically connected to the circuit board (231) in sequence from left to right, and the meter (235) displays the current on the shunt channel (23) in real time; The trigger module (22) contacts the contactor (232) when the current in the total circuit reaches a set value and diverts the current in the total circuit to the diversion channel (23); the current in the diversion channel (23) is adjusted by the temperature control component (234) and is positively correlated with the ambient temperature when the current in the total circuit is stable; and the change trend of the current on the first double metal (11) is opposite to that of the diversion channel (23).

2. A multi-channel digital display temperature control circuit breaker according to claim 1, characterized in that: The temperature control component (234) is an NTC thermistor, and the maximum resistance of the temperature control component (234) is not less than 5 times the minimum resistance. The temperature control component (234) is arranged on a side away from the first double metal (11).

3. A multi-channel digital display temperature control circuit breaker according to claim 2, characterized in that: The resistance of the fixed-value resistor (233) is not less than the minimum resistance of the temperature control component, and the fixed-value resistor (233) and the temperature control component (234) are connected in series.

4. A multi-channel digital display temperature control circuit breaker according to claim 3, characterized in that: The meter head (235) is connected in series with the fixed value resistor (233) and the temperature control component (234); the meter head (235) comprises a meter body (2351), a dial (2352), and a meter needle (2353); and the dial (2352) is provided with a color indication (23521) and a text indication (23522).

5. A multi-channel digital display temperature control circuit breaker according to claim 4, characterized in that: The contact (232) comprises a fourth spring (2321) and a conductive sheet (2322); the fourth spring (2321) is inserted into the circuit board (231); the fourth spring (2321) is connected in series with the fixed value resistor (233), the temperature control component (234), and the meter head (235); the conductive sheet (2322) is connected to the upper end of the fourth spring (2321); the trigger module (22) comprises a trigger lever (221), a support rod (222), and a gear (223); the trigger lever (221) comprises a fulcrum (2211), a left arm (2212), and a right arm (2213); the fulcrum (2211) is hinged on the housing (1); the left arm (2212) and the right arm (2213) are respectively located on the left and right sides of the fulcrum (2211); and the length of the left arm (2212) is greater than that of the right arm (2213).

6. A multi-channel digital display temperature control circuit breaker according to claim 5, characterized in that: The support rod (222) comprises a main body (2221), an upper supporting portion (2222), a conductive portion (2223), and a first rack (2224); a fixing frame (101) and a support column (102) are arranged on the shell (1); the main body (2221) is inserted into the fixing frame (101); the upper supporting portion (2222), the conductive portion (2223), and the first rack (2224) are arranged on the main body (2221) in sequence from bottom to top; a protrusion (131) is arranged on the right side of the second conductive plate (13); the protrusion (131) is arranged in an arc-shaped structure, and the protrusion (131) is pressed against the conductive portion (2223).

7. A multi-channel digital display temperature control circuit breaker according to claim 6, characterized in that: The magnetic pin (19) comprises a counterweight portion (191) and a rod portion (192) from top to bottom, and the rod portion (192) comprises a cylindrical portion (1921) and a square column portion (1922) from top to bottom, the side edges of the square column portion (1922) are rounded, and a second rack (19221) is arranged inside the square column portion (1922).

8. A multi-channel digital display temperature control circuit breaker according to claim 7, characterized in that: The upper supporting portion (2222) is located below the left arm (2212), and the left and right edges of the upper supporting portion (2222) are rounded. The gear (223) is installed below the fixing frame (17), and the first rack (2224) and the second rack (19221) are both meshed with the gear (223), and the number of teeth of the first rack (2224) is less than that of the second rack (19221).

9. A multi-channel digital display temperature control circuit breaker according to claim 8, characterized in that: The first rack (2224) and the second rack (19221) have the same width, and the width of the first rack (2224) and the second rack (19221) is smaller than the width of the gear (223).

10. A multi-channel digital display temperature control circuit breaker according to claim 9, characterized in that: A through hole (171) is provided at the lower end of the fixing frame (17), and the through hole (171) is located on the projection of the contour of the third spring (21) in the upper and lower directions of the fixing frame (17), and the through hole (171) is arranged at a position where the lower end of the third spring (21) and the fixing frame (17) are not in contact, and the through hole (171) is fitted with the upward first rack (2224), and the distance from the upper end surface of the first rack (2224) to the lower end of the third spring (21) is not greater than the upward stroke of the first rack (2224).

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