An intelligent switching electrical apparatus with adjustable double reaction force and opening distance and its working method

Abstract

The present invention provides an intelligent switching electrical appliance with adjustable double reaction force and opening distance and its working method, which includes an electromagnetic mechanism, a contact mechanism, a control module, a connecting mechanism and a base; the electromagnetic mechanism includes a moving iron core, a static iron core, a coil, a first reaction force spring and a second reaction force spring; the length of the first reaction force spring is longer than that of the second reaction force spring, and the stiffness coefficient of the first reaction force spring is smaller than that of the second reaction force spring; the contact mechanism is composed of a moving contact, a static contact and a contact spring; the distance between the moving contact and the static contact is the opening distance. By compressing the first and second reaction force springs, the suction impact force of the iron core is reduced; during breaking, a large reaction force is generated by releasing the first and second reaction force springs to improve the contact breaking speed. By detecting the magnitude and type of the breaking current through the control module, the size of the contact opening distance is adjusted according to requirements to realize the intelligent control of the breaking process, so as to achieve the purpose of improving the service life of the switching electrical appliance.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage switch appliances, and particularly to an intelligent switch appliance with adjustable double reaction force and opening distance and its working method. Background Art

[0002] With the continuous improvement of people's demand for switch appliances, control appliances and protection appliances are no longer two independent switch appliances. The integrated switch on the market is a modular combination type control and protection system, which can connect and disconnect current under normal or abnormal circuit conditions. However, it is expensive, and the combination of multiple devices will inevitably reduce the reliability of the system, with certain limitations. The integrated electromagnetic control and protection switch appliance as a whole does not have a complex tripping mechanism, and the number of parts is greatly reduced compared with the modular combination type control and protection switch appliance. The simpler structure ensures the low failure rate of the switch and higher operation stability. However, most of the current electromagnetic control and protection switches use large opening distance of the contact to break the short-circuit current. When closing the switch at a large opening distance, the power consumption is high, the impact force of the moving iron core is large, the iron core wears seriously, and at the same time, it also causes secondary bounce of the contact, making the contact easy to weld. Currently, there is a type of electromagnetic control and protection switch that uses the cooperation of a return spring and a limit mechanism to make the contact return to a balance position slightly smaller than the opening distance after breaking the short-circuit current with a large opening distance, improving the closing characteristics. However, the disadvantage of this solution is that whether it is breaking a short-circuit fault, an overload fault or normal frequent breaking, it must reach the maximum opening distance. After frequently breaking the current with a large opening distance and then using the return spring to reset, it will cause the return spring to age rapidly and cause serious mechanical wear, affecting the service life of the electromagnetic control and protection switch and being not suitable for occasions of frequently switching on and off the normal rated current. In addition, these solutions do not achieve intelligent control of the breaking process. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide an intelligent switch appliance with adjustable double reaction force and opening distance and its working method. Through the combined action of the first reaction spring and the second reaction spring, the collision force of the iron core during suction can be effectively reduced. During breaking, the control module detects the circuit current, and intelligently adjusts the opening distance of the contact according to the magnitude of the current and the type of breaking, breaking normal current, overload current, and short-circuit current, so as to achieve the purpose of reducing the impact force of the iron core during frequent switching of the normal current and improving the service life of the switch appliance.

[0004] To achieve the above object, the present invention adopts the following technical solutions: An intelligent switching electrical apparatus with double reaction force adjustable opening distance and its working method, including an electromagnetic mechanism, a contact mechanism, a control module, a connecting mechanism and a base; the electromagnetic mechanism includes a moving iron core, a static iron core, a coil, a first reaction force spring and a second reaction force spring; the contact mechanism includes a moving contact, a static contact and a contact spring; the control module consists of a control unit and a sensor; the static iron core is fixed on the base; the coil is sleeved on the static iron core; the moving iron core is fixed on one side of the connecting mechanism facing the base; the moving contact is connected to the connecting mechanism, and the moving contact moves synchronously with the connecting mechanism and the moving iron core; the static contact is arranged between the moving iron core and the moving contact; there is an air gap between the moving iron core and the static iron core; there is an opening distance between the moving contact and the static contact; the first reaction force spring and the second reaction force spring are compressed or stretched in the moving direction of the moving iron core; the length of the first reaction force spring is longer than that of the second reaction force spring, and the spring constant of the first reaction force spring is smaller than that of the second reaction force spring;

[0005] There are different opening distances in the off state between the moving contact and the static contact, which are respectively the maximum opening distance reached when breaking the short-circuit fault current, i.e., the short-circuit opening distance, the larger opening distance for breaking the overload current, i.e., the overload opening distance, and the opening distance for breaking the rated current, i.e., the normal state opening distance; the short-circuit opening distance is greater than the overload opening distance, and the overload opening distance is greater than the normal state opening distance;

[0006] The working method of an intelligent switching electrical apparatus with double reaction force adjustable opening distance is specifically as follows: During the closing process of the switching electrical apparatus, the coil is energized to generate electromagnetic suction. The moving iron core needs to overcome the reaction force of the first reaction force spring under the action of the electromagnetic suction. Since the electromagnetic suction generated by the large air gap between the moving iron core and the static iron core is small, the initial reaction force generated when the first reaction force spring is compressed is small, and the moving iron core can continue to move; when the air gap between the moving iron core and the static iron core decreases, the suction increases significantly, and the first reaction force spring and the second reaction force spring are compressed simultaneously, resulting in a significant increase in the reaction force, which significantly reduces the core collision speed when the moving iron core and the static iron core are closed, thereby reducing the contact bounce caused by the core collision;

[0007] When the sensor detects a short-circuit current, the control unit controls the coil to be powered off, the electromagnetic suction is eliminated, and the first reaction force spring and the second reaction force spring are released simultaneously and act on the moving iron core. The moving contact quickly breaks. When the moving contact reaches the normal state opening distance, due to inertia, the moving iron core will continue to drive the contact to move upward and stretch the first reaction force spring until the short-circuit opening distance, and then the moving contact is pulled back to the normal state opening distance under the restoring force of the first reaction force spring;

[0008] When the sensor detects an overload current, the control unit controls the coil to cut off the power, the electromagnetic suction force is eliminated, and the first reaction spring and the second reaction spring are released simultaneously and act on the moving iron core. The moving contact quickly breaks. Before and after the moving contact reaches the normal state opening distance, the control module applies a short-time current pulse to the coil to excite the coil to generate an electromagnetic suction force. Under the influence of this transient electromagnetic suction force, the moving iron core slows down, so that after the moving contact reaches the overload opening distance, it returns to the normal state opening distance under the restoring force of the first reaction spring; the pulse width is inversely proportional to the magnitude of the overload current.

[0009] When the switch device needs to break the normal rated current, the control unit controls the coil to cut off the power, the electromagnetic suction force is eliminated, and the first reaction spring and the second reaction spring are released simultaneously and act on the moving iron core. The moving contact quickly breaks. Before the moving contact reaches the normal state opening distance, the control module applies a short-time current pulse to the coil to excite the coil to generate an electromagnetic suction force. Under the influence of this transient electromagnetic suction force, the moving iron core slows down, so that when the contact reaches the normal state opening distance, it stops moving.

[0010] Further: It is characterized in that: the electromagnetic mechanism is specifically a U-shaped structure or an E-shaped structure.

[0011] Further: When the electromagnetic mechanism is a U-shaped structure, the moving iron core is fixed on the side of the connecting mechanism facing the base; one ends of the first reaction spring and the second reaction spring are fixed on the base; the other end of the first reaction spring is fixedly connected to the side of the connecting mechanism facing the base; when the moving iron core moves downward, both ends of the first reaction spring and the second reaction spring are compressed by the connecting mechanism and the base respectively.

[0012] Further: When the electromagnetic mechanism is an E-shaped structure, both ends of the first reaction spring are respectively fixed above the moving iron core and the coil, and one end of the second reaction spring is fixed above the coil; when the moving iron core moves downward, both ends of the first reaction spring and the second reaction spring are compressed by the moving iron core and the coil respectively.

[0013] Further: The first reaction spring and the second reaction spring are both in a free state when the switch device is not powered on.

[0014] Further: When breaking the short-circuit fault current to reach the short-circuit opening distance or breaking the overload current to reach the overload opening distance, the first reaction spring is in a stretched state, and then returns to the normal state opening distance under the restoring force of the first reaction spring. At this time, both the first reaction spring and the second reaction spring are in a free state.

[0015] Further: The connecting mechanism includes a fixed seat and a connecting rod; the connecting rod is fixed on a side of the fixed seat facing away from the base, and an abutting portion is fixed at an end of the connecting rod away from the fixed seat; a moving contact is arranged between the abutting portion and the fixed seat.

[0016] Further: A contact spring is arranged between the abutting portion and the moving contact, and the contact spring is sleeved outside the connecting rod.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention provides an intelligent switch electrical appliance with double reaction force adjustable opening distance, which is designed according to the idea of an intelligent switch electrical appliance that determines the opening distance of the contact according to the magnitude of the breaking current, and reduces the collision speed during iron core attraction and increases the contact breaking speed. For this intelligent switch electrical appliance with double reaction force adjustable opening distance, before the switch breaks, the control module can detect the magnitude and type of the breaking current, thereby controlling the coil to power off, and applying current pulses with different widths to the coil during the upward movement of moving components such as the moving contact and the moving iron core, so that the contact reaches different opening distances. Due to the existence of the double reaction force spring, the initial reaction force of the switch is small and the final reaction force is very large, which can effectively reduce the iron core collision speed without affecting the attraction speed; under the combined action of the double reaction force spring, the breaking speed is very large, enabling the contact to reach the maximum opening distance (short-circuit opening distance) to break the short-circuit current. After the arc is extinguished, the contact and the iron core return to the normal open position; the control module is used to detect the circuit, and different contact opening distances are adjusted according to different magnitudes of the breaking current and the breaking type, which can be used to break the normal current, overload current, and short-circuit current in the circuit; compared with other electromagnetic control and protection electromagnetic switch electrical appliances, the closing and breaking times are short during frequent on-off of the normal current, and the electrical life is longer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the intelligent switch electrical appliance with double reaction force adjustable opening distance according to the first preferred embodiment of the present invention;

[0020] Figure 2 It is a schematic structural diagram of the intelligent switch electrical appliance with double reaction force adjustable opening distance according to the second preferred embodiment of the present invention;

[0021] Figure 3 It is a schematic diagram of the closing state of the intelligent switch electrical appliance with double reaction force adjustable opening distance according to the second preferred embodiment of the present invention;

[0022] Figure 4 It is a schematic diagram of the opening state (one) of the intelligent switch electrical appliance with double reaction force adjustable opening distance according to the second preferred embodiment of the present invention;

[0023] Figure 5Schematic diagram (II) of the opening state of the intelligent switch with adjustable double reaction force and opening distance according to the preferred embodiment 2 of the present invention.

[0024] Reference signs: 1 - contact spring, 2 - static contact, 3 - moving contact, 4 - connecting mechanism, 5 - moving iron core, 6 - first reaction spring, 7 - coil, 8 - second reaction spring, 9 - static iron core. Detailed implementation mode

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanations for the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0027] It should be noted that the terms used herein are only for describing the specific implementation modes and are not intended to limit the exemplary implementation modes according to the present application; as used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprise" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0028] Embodiment 1

[0029] An intelligent switch with adjustable double reaction force and opening distance, referring to Figure 1 , includes an electromagnetic mechanism, a contact mechanism, a connecting mechanism 4 and a control module; the electromagnetic mechanism includes a moving iron core 5, a static iron core 9, a coil 7, a first reaction spring 6 and a second reaction spring 8; the moving iron core 5 and the static iron core 9 are of E type, the static iron core 9 is placed on a base, there is an air gap between the moving iron core 5 and the static iron core 9, there is an opening distance between the moving contact 3 and the static contact 2, the coil 7 is sleeved on the static iron core 9, and the first reaction spring 6 and the second reaction spring 8 are compressed or stretched in the moving direction of the moving iron core 5; the length of the first reaction spring 6 is longer than that of the second reaction spring 8, and the spring constant of the first reaction spring 6 is smaller than that of the second reaction spring 8; the contact mechanism includes a moving contact 3, a static contact 2 and a contact spring 1; the static contact 2 is arranged between the moving iron core 5 and the moving contact 3; the connecting mechanism 4 connects the moving iron core 5 and the moving contact 3; the control module is composed of a control unit and a sensor.

[0030] The second reaction spring 8 is sleeved outside the first reaction spring 6, and both the first reaction spring 6 and the second reaction spring 8 are in a free state when the switch is not powered on.

[0031] Both ends of the first reaction spring 6 are respectively connected to the moving iron core 5 and the coil 7, and one end of the second reaction spring 8 is fixed above the coil 7. In this embodiment, the first reaction spring 6 and the second reaction spring 8 are arranged above the coil 7; when the moving iron core 5 moves downward, the moving iron core 5 compresses the first reaction spring 6 and the second reaction spring 8.

[0032] Embodiment 2

[0033] The main difference between this embodiment and Embodiment 1 lies in the iron core shape and the setting position of the reaction spring. Refer to Figure 2 , the moving iron core 5 and the static iron core 9 are U-shaped; the second reaction spring 8 is sleeved outside the first reaction spring 6, and one ends of the first reaction spring 6 and the second reaction spring 8 are fixed on the base; the other end of the first reaction spring 6 is fixedly connected to the surface of the connecting mechanism 4 facing the base; the surface of the connecting mechanism 4 facing the base is also fixedly connected with the moving iron core 5; when the moving iron core 5 moves downward, both ends of the first reaction spring 6 and the second reaction spring 8 are compressed by the connecting mechanism 4 and the base respectively. In this embodiment, the second reaction spring 8 is sleeved outside the first reaction spring 6 to form a set of reaction springs, and a set of reaction springs are arranged on both sides of the coil 7.

[0034] The connecting mechanism 4 includes a fixed seat and a connecting rod; a receiving cavity is arranged on the surface of the fixed seat facing the base, and the receiving cavity is used for receiving the moving iron core 5. The connecting rod is fixed on the surface of the fixed seat facing away from the base, and a top portion is fixed at the end of the connecting rod away from the fixed seat; a moving contact 3 is arranged between the top portion and the fixed seat. A contact spring 1 is arranged between the top portion and the moving contact 3, and the contact spring 1 is sleeved outside the connecting rod.

[0035] During the closing process of the switch electrical appliance, the coil 7 is energized to generate electromagnetic suction. The moving iron core 5 has to overcome the reaction force of the first reaction spring 6 under the action of the electromagnetic suction. Since the electromagnetic suction in the large air gap between the moving iron core 5 and the static iron core 9 is small, the initial reaction force generated when the first reaction spring 6 is compressed is small, and the moving iron core 5 can continue to move; when the moving iron core 5 and the static iron core 9 are closed into a small air gap, the suction increases significantly, and the first reaction spring 6 and the second reaction spring 8 are compressed simultaneously, so that the reaction force increases significantly, and the iron core collision speed when the moving iron core 5 and the static iron core 9 are closed is significantly reduced, thereby reducing the contact bounce caused by the iron core collision; specifically as Figure 3As shown, after the control unit energizes the coil 7, an electromagnetic force is generated. The static iron core 9 attracts the moving iron core 5 to move downward and compress the first reaction spring 6, and drives the moving contact 3 and the contact spring 1 to move downward through the connecting mechanism 4. Since the elastic coefficient of the first reaction spring 6 is small, the reaction force to be overcome in the initial stage of the closing process is very small. When the moving part moves downward to the free length range of the second reaction spring 8, the iron core that continues to move downward simultaneously compresses the second reaction spring 8 and the first reaction spring 6. The spring reaction forces of the second reaction spring 8 and the first reaction spring 6 act together on the moving iron core 5. At this time, the reaction force surges, greatly reducing the closing speed of the moving iron core 5 until the closing action is completed. The moving contact 3 contacts the static contact 2, the main circuit is connected, and the moving iron core 5 continues to move downward, compressing the contact spring 1 until it fits against the pole face of the static iron core 9. Because the speed of the moving iron core 5 before closing is reduced, the impact force of the iron core collision is greatly reduced, and the secondary bounce of the contact caused by the iron core collision is significantly reduced.

[0036] Before the control coil 7 is de-energized, the control module is used to detect the loop current. If the current in the loop at this time is a short-circuit current, the control unit controls the coil 7 to be de-energized, the electromagnetic attraction is eliminated, and the first reaction spring 6 and the second reaction spring 8 are released simultaneously and act together on the moving iron core 5 to make it move upward, driving the moving contact 3 to move upward through the connecting mechanism 4. Because the elastic coefficient of the second reaction spring 8 is large, the initial reaction force during the breaking process is very large, which can quickly break the contact to reach the normal state opening distance. Due to inertia, the moving iron core 5 will continue to drive the moving contact 3 to move upward and stretch the first reaction spring 6 until the short-circuit opening distance is reached. At the same time, the large opening distance of the contact during breaking is used to break the short-circuit current. For specific reference Figure 4 , the dotted line is the normal state opening distance of the contact. After breaking the short-circuit current at the large opening distance, the first reaction spring 6 connected to the moving iron core 5 pulls the moving contact 3, the moving iron core 5 and other moving parts back to the normal state opening distance until stable. The moving contact 3 separates from the static contact 2. At this time, the breaking action is completed, and the main circuit successfully breaks the short-circuit current.

[0037] If the loop current detected by the control module is an overload current, the control unit controls the coil 7 to be de-energized, the electromagnetic attraction is eliminated, and the first reaction spring 6 and the second reaction spring 8 are released simultaneously and act together on the moving iron core 5 to make it move upward, driving the moving contact 3 to move upward through the connecting mechanism 4. Because the elastic coefficient of the second reaction spring 8 is large, the initial reaction force during the breaking process is very large, which can quickly break the contact. Before and after the moving contact 3 reaches the normal state opening distance, the control module applies a short-time current pulse to the coil 7 to make the coil 7 excited to generate an electromagnetic attraction, so that under the influence of this transient electromagnetic attraction, the moving iron core 5 slows down, and after the moving contact 3 reaches the overload opening distance, it returns to the normal state opening distance under the restoring force of the first reaction spring 6; the pulse width is inversely proportional to the magnitude of the overload current.

[0038] If the loop current detected by the control module is the rated current, the control unit controls the electromagnetic coil 7 to be powered off, eliminating the electromagnetic attraction. The first reaction spring 6 and the second reaction spring 8 are released simultaneously and act together on the moving iron core 5 to move it upward, driving the moving contact 3 to move upward through the connecting mechanism 4. Because the elastic coefficient of the second reaction spring 8 is large, the initial reaction force during the breaking process is very large, enabling the contacts to be quickly broken. Before the moving contact 3 reaches the normal opening distance state, the control module applies a short-time current pulse to the coil 7 (with a larger pulse width compared to when breaking the overload current), causing the coil 7 to be excited to generate electromagnetic attraction. Under the influence of this transient electromagnetic attraction, the moving iron core 5 slows down, enabling the switchgear to break the rated current at the normal opening distance. For specific reference Figure 5 。

[0039] To more intuitively observe the changes in the first reaction spring 6 and the second reaction spring 8, Figures 3 to 5 the first reaction spring 6 and the second reaction spring 8 shown in Figures 3 to 5 are in a separated state. In the actual use process, the second reaction spring 8 is sleeved outside the first reaction spring 6.

[0040] The moving contact 3 and the static contact 2 have different opening distances in the disconnected state, namely the maximum opening distance reached when breaking the short-circuit fault current is the short-circuit opening distance, the larger opening distance when breaking the overload current is the overload opening distance, and the opening distance when breaking the rated current is the normal state opening distance; the short-circuit opening distance is greater than the overload opening distance, and the overload opening distance is greater than the normal state opening distance. When breaking the short-circuit fault current to reach the short-circuit opening distance or breaking the overload current to reach the overload opening distance, the first reaction spring 6 is in a stretched state, and then returns to the normal state opening distance under the restoring force of the first reaction spring 6. At this time, both the first reaction spring 6 and the second reaction spring 8 are in a free state.

[0041] In any of the technical solutions disclosed in the above embodiments, the terms used to represent the positional relationship or shape, unless otherwise stated, include states or shapes that are approximate, similar, or close to it. Different installation distributions of the double-spring structure, different control module compositions, and different models of the electromagnetic system are not the only combinations for the design and invention of this switchgear. Switchgears with the same effect but using different combinations of components all fall within the scope of this design. This patent is not limited to the above optimal implementation manner. Anyone can obtain various other forms of intelligent switchgears based on double reaction springs and their working methods under the inspiration of this patent. All equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope covered by this patent.

Claims

1. A working method of an intelligent switching electrical apparatus with adjustable double reaction force and opening distance, characterized in that, The intelligent switching electrical apparatus with double reaction force adjustable opening distance includes an electromagnetic mechanism, a contact mechanism, a control module, a connecting mechanism and a base; the electromagnetic mechanism includes a moving iron core, a static iron core, a coil, a first reaction spring and a second reaction spring; the contact mechanism includes a moving contact, a static contact and a contact spring; the control module consists of a control unit and a sensor; the static iron core is fixed on the base; the coil is sleeved on the static iron core; the moving iron core is fixed on one side of the connecting mechanism facing the base; the moving contact is connected to the connecting mechanism, and the moving contact moves synchronously with the connecting mechanism and the moving iron core; the static contact is arranged between the moving iron core and the moving contact; there is an air gap between the moving iron core and the static iron core; there is an opening distance between the moving contact and the static contact; the first reaction spring and the second reaction spring are compressed or stretched in the moving direction of the moving iron core; the length of the first reaction spring is longer than that of the second reaction spring, and the spring constant of the first reaction spring is smaller than that of the second reaction spring; There are different opening distances in the off state between the moving contact and the static contact, which are the maximum opening distance reached when breaking the short-circuit fault current, i.e., the short-circuit opening distance, the larger opening distance for breaking the overload current, i.e., the overload opening distance, and the opening distance for breaking the rated current, i.e., the normal state opening distance; the short-circuit opening distance is greater than the overload opening distance, and the overload opening distance is greater than the normal state opening distance; The working method of the intelligent switching electrical apparatus with double reaction force adjustable opening distance is as follows: during the closing process of the switching electrical apparatus, the coil is energized to generate electromagnetic suction. The moving iron core needs to overcome the reaction force of the first reaction spring under the action of the electromagnetic suction. Since the electromagnetic suction generated by the large air gap between the moving iron core and the static iron core is small, the initial reaction force generated when the first reaction spring is compressed is small, and the moving iron core can continue to move; when the air gap between the moving iron core and the static iron core decreases, the suction increases significantly, and the first reaction spring and the second reaction spring are compressed simultaneously, so that the reaction force increases significantly, resulting in a significant reduction in the core collision speed when the moving iron core and the static iron core are closed, thereby reducing the contact bounce caused by the core collision; When the sensor detects a short-circuit current, the control unit controls the coil to be powered off, the electromagnetic suction is eliminated, and the first reaction spring and the second reaction spring are released simultaneously and act on the moving iron core. The moving contact quickly breaks. When the moving contact reaches the normal state opening distance, due to inertia, the moving iron core will continue to drive the contact to move upward and stretch the first reaction spring until the short-circuit opening distance, and then the moving contact is pulled back to the normal state opening distance under the restoring force of the first reaction spring; When the sensor detects an overload current, the control unit controls the coil to cut off power, the electromagnetic suction force is eliminated, and the first reaction spring and the second reaction spring are simultaneously released and act on the moving iron core. The moving contact quickly breaks. Before and after the moving contact reaches the normal open distance, the control module applies a short-time current pulse to the coil to excite the coil to generate electromagnetic suction force. Under the influence of this transient electromagnetic suction force, the moving iron core slows down, so that after the moving contact reaches the overload open distance, it returns to the normal open distance under the restoring force of the first reaction spring; the pulse width is inversely proportional to the magnitude of the overload current. When the switch device needs to break the normal rated current, the control unit controls the coil to cut off power, the electromagnetic suction force is eliminated, and the first reaction spring and the second reaction spring are simultaneously released and act on the moving iron core. The moving contact quickly breaks. Before the moving contact reaches the normal open distance, the control module applies a short-time current pulse to the coil to excite the coil to generate electromagnetic suction force. Under the influence of this transient electromagnetic suction force, the moving iron core slows down, so that when the contact reaches the normal open distance, it stops moving.

2. The working method of an intelligent switching electrical apparatus with double reaction force adjustable opening distance according to claim 1, characterized in that: The electromagnetic mechanism is specifically a U-shaped structure or an E-shaped structure.

3. The working method of an intelligent switching electrical apparatus with double reaction force adjustable opening distance according to claim 2, characterized in that: When the electromagnetic mechanism is a U-shaped structure, the moving iron core is fixed on the side of the center of the connecting mechanism facing the base; one ends of the first reaction spring and the second reaction spring are fixed on the base; the other end of the first reaction spring is fixedly connected to the side of the connecting mechanism facing the base; when the moving iron core moves downward, both ends of the first reaction spring and the second reaction spring are compressed by the connecting mechanism and the base respectively.

4. The working method of an intelligent switching electrical apparatus with double reaction force adjustable opening distance according to claim 2, characterized in that: When the electromagnetic mechanism is an E-shaped structure, both ends of the first reaction spring are respectively fixed above the moving iron core and the coil, and one end of the second reaction spring is fixed above the coil; when the moving iron core moves downward, both ends of the first reaction spring and the second reaction spring are compressed by the moving iron core and the coil respectively.

5. The working method of an intelligent switching electrical apparatus with a double reaction force adjustable opening distance according to claim 1, characterized in that: Both the first reaction spring and the second reaction spring are in a free state when the switch device is not powered on.

6. The working method of an intelligent switching electrical apparatus with a double reaction force adjustable opening distance according to claim 1, characterized in that: When breaking the short-circuit fault current to reach the short-circuit open distance or breaking the overload current to reach the overload open distance, the first reaction spring is in a stretched state, and then returns to the normal open distance under the restoring force of the first reaction spring. At this time, both the first reaction spring and the second reaction spring are in a free state.

7. The working method of an intelligent switching electrical apparatus with a double reaction force adjustable opening distance according to claim 1, characterized in that: The connecting mechanism includes a fixed seat and a connecting rod; the connecting rod is fixed on the side of the fixed seat facing away from the base, and a top part is fixed at the end of the connecting rod far away from the fixed seat; the moving contact is arranged between the top part and the fixed seat.

8. The working method of an intelligent switching electrical apparatus with a double reaction force adjustable opening distance according to claim 7, characterized in that: A contact spring is arranged between the top part and the moving contact, and the contact spring is sleeved outside the connecting rod.

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