Single break vacuum switch

Abstract

The present application discloses a single-break vacuum switch, comprising: a single-break arc extinguishing chamber, an electromagnetic repulsion mechanism, and an insulating transmission mechanism; the single-break arc extinguishing chamber comprises: an insulating housing, and two movable contacts movably arranged in the insulating housing; the electromagnetic repulsion mechanism drives the two movable contacts to move synchronously through the insulating transmission mechanism to achieve closing and opening. The above-mentioned single-break vacuum switch adopts a single-break arc extinguishing chamber, and both contacts of the single-break arc extinguishing chamber are movable contacts. The electromagnetic repulsion mechanism drives the two movable contacts to move synchronously through the insulating transmission mechanism to achieve closing and opening. In this way, the electromagnetic repulsion mechanism is applied to the single-break vacuum switch; both movable contacts move, which increases the distance between the two movable contacts in the open state, that is, increases the full opening distance of the single-break vacuum switch, so that the single-break vacuum switch can be used as a transmission-grade vacuum switch.

Description

Technical Field

[0001] The present application relates to the technical field of fast vacuum switches, and more specifically, to a single-break vacuum switch. Background Art

[0002] A vacuum switch primarily consists of a vacuum interrupter, an operating mechanism, and a bracket. The operating mechanism drives the contacts of the vacuum interrupter to open and close the switch. A narrow opening distance can compromise the breaking capacity and withstand voltage of the vacuum switch. The electromagnetic repulsion mechanism is a relatively new operating mechanism. It offers advantages such as short opening time, high initial opening speed, and low opening time dispersion. This significantly shortens short-circuit current removal time and improves power system transient stability.

[0003] When the vacuum switch is in the open position, the distance between the moving and static contacts of the vacuum interrupter is the opening distance. Due to the electromagnetic repulsion mechanism, the maximum full-open distance that the vacuum interrupter can reach is relatively small. Usually, the maximum full-open distance is often less than 40mm, which affects the breaking capacity and withstand voltage level of the vacuum switch, making the electromagnetic repulsion mechanism unable to be applied to transmission-grade vacuum switches.

[0004] In summary, how to drive the movement of contacts through the electromagnetic repulsion mechanism to increase the full-open distance of the vacuum switch so as to apply the electromagnetic repulsion mechanism to a transmission-grade vacuum switch is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a single-break vacuum switch, which drives the contact to move through an electromagnetic repulsion mechanism to increase the full-open distance of the vacuum switch, so as to apply the electromagnetic repulsion mechanism to a transmission-level vacuum switch.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] A single-break vacuum switch, comprising: a single-break arc extinguishing chamber, an electromagnetic repulsion mechanism and an insulation transmission mechanism;

[0008] The single-break arc extinguishing chamber comprises: an insulating shell, two movable contacts movably arranged on the insulating shell;

[0009] The electromagnetic repulsion mechanism drives the two moving contacts to move synchronously through the insulating transmission mechanism to achieve closing and opening.

[0010] Optionally, the electromagnetic repulsion mechanism includes: a first repulsion disk, a second repulsion disk and a repulsion coil assembly;

[0011] There are two insulating transmission mechanisms, namely a first insulating transmission mechanism and a second insulating transmission mechanism. The first repulsive disk is connected to one of the moving contacts via the first insulating transmission mechanism, and the second repulsive disk is connected to the other moving contact via the second insulating transmission mechanism.

[0012] The repulsion coil assembly has: a first energized state in which the first repulsion disk and the second repulsion disk are driven to move toward each other and drive the two moving contacts to move away from each other, and a second energized state in which the first repulsion disk and the second repulsion disk are driven to move away from each other and drive the two moving contacts to move toward each other.

[0013] Optionally, the repulsion coil assembly includes: a first repulsion coil, a second repulsion coil and a third repulsion coil;

[0014] The first repulsion coil, the second repulsion coil, and the third repulsion coil are sequentially distributed along the sliding direction of the first repulsion disk, the first repulsion disk is located between the first repulsion coil and the second repulsion coil, and the second repulsion disk is located between the second repulsion coil and the third repulsion coil;

[0015] The first repulsion coil and the third repulsion coil are connected in series; when the first repulsion coil and the third repulsion coil are energized at the same time, the repulsion coil assembly is in the first energized state; when the second repulsion coil is energized, the repulsion coil assembly is in the second energized state.

[0016] Optionally, the first repulsion disk and the second repulsion disk both include: a repulsion disk connecting sleeve and a repulsion disk body;

[0017] Wherein, the repulsion disc main body is fixedly connected to one end of the repulsion disc connecting sleeve, and the repulsion disc main body is externally fitted on the repulsion disc connecting sleeve;

[0018] The repulsion disc body of the first repulsion disc and the repulsion disc body of the second repulsion disc are arranged opposite to each other; the repulsion disc body of the first repulsion disc is located between the first repulsion coil and the second repulsion coil, and the repulsion disc body of the second repulsion disc is located between the second repulsion coil and the third repulsion coil;

[0019] The first repulsion coil is externally mounted on the repulsion disk connecting sleeve of the first repulsion disk, and the third repulsion coil is externally mounted on the repulsion disk connecting sleeve of the second repulsion disk.

[0020] Optionally, the repulsion coil assembly further includes a sliding guide, the repulsion disc connecting sleeve is slidably mounted on the sliding guide, and the second repulsion coil is mounted on the sliding guide;

[0021] Wherein, the first repulsion coil, the second repulsion coil and the third repulsion coil are all relatively fixed to the sliding conductive member;

[0022] And / or, one of the repulsion disk connecting sleeve and the sliding guide is provided with a protrusion, and the other is provided with a sliding groove that slides with the protrusion.

[0023] Optionally, the single-break vacuum switch further includes a control circuit;

[0024] Wherein, when the single-break vacuum switch needs to be opened, the control circuit is used to control the first repulsion coil and the third repulsion coil to be energized at the same time; when the single-break vacuum switch needs to be closed, the control circuit is used to control the second repulsion coil to be energized.

[0025] Optionally, the control circuit includes: a charging power supply, an energy storage capacitor, a first switch, a second switch, a third switch, a first controller, a second controller and a third controller;

[0026] The charging power supply and the first switch are connected in series to form a first branch, the second switch, the first repulsion coil, and the third repulsion coil are connected in series to form a second branch, and the third switch and the second repulsion coil form a third branch; the first branch, the second branch, the third branch, and the capacitor are all connected in parallel;

[0027] The control end of the first switch is connected to the first controller, the control end of the second switch is connected to the second controller, and the control end of the third switch is connected to the third controller;

[0028] When the single-break vacuum switch needs to be opened, the first controller is used to control the first switch to be closed, the second controller is used to control the second switch to be opened, and the third controller is used to control the third switch to be opened, so that the charging power supply charges the capacitor; when the voltage of the capacitor reaches U1, the first controller is used to control the first switch to be opened, and the second controller is used to control the second switch to be closed, so that the capacitor supplies power to the first repulsion coil and the third repulsion coil; when the voltage of the capacitor drops to U2, the second controller is used to control the second switch to be opened, and the third controller is used to control the third switch to be closed, so that the capacitor supplies power to the second repulsion coil; when the voltage of the capacitor drops to zero, the third controller is used to control the third switch to be opened;

[0029] Wherein, (U1-U2) / (Z1+Z3)=U2 / Z2, Z1 is the impedance of the first repulsion coil, Z2 is the impedance of the second repulsion coil, and Z3 is the impedance of the third repulsion coil. Optionally, the first switch is a DC contactor, and the second switch and the third switch are both IGBTs;

[0030] And / or, the second controller and the third controller are integrated into a first control module, or the first controller, the second controller and the third controller are integrated into a second control module;

[0031] And / or, Z1=Z2=Z3.

[0032] Optionally, the first repulsion disk and the second repulsion disk are both repulsion disks;

[0033] The insulating transmission mechanism comprises: a first connecting rod, a second connecting rod and a transmission fixing member;

[0034] Particularly, the first end of the first connecting rod is hinged to the moving contact, the second end of the first connecting rod is hinged to the first end of the second connecting rod, the second end of the second connecting rod is hinged to the repulsion disk, and the middle part of the first connecting rod is hinged to the transmission fixing member; at least one of the first connecting rod and the second connecting rod is an insulating member.

[0035] Optionally, the first end of the first connecting rod is farther away from a hinged position between the first connecting rod and the transmission fixing member than the second end;

[0036] And / or, the second end of the second connecting rod and the repulsion disk are hingedly connected by a connecting pin, the sliding guide is provided with a clearance cavity, and a first clearance hole and a second clearance hole both communicating with the clearance cavity, the connecting pin passes through the clearance cavity and the second clearance hole, the connecting pin and the second clearance hole are slidably engaged, and one end of the second connecting rod extends into the clearance cavity through the first clearance hole and is hingedly connected to the connecting pin;

[0037] And / or, the repulsion disk is provided with a slot, and the second end of the second connecting rod is located in the slot;

[0038] And / or, the insulating transmission mechanism further comprises: a guide fixing member, the guide fixing member and the sliding guide member are relatively fixed, and the guide fixing member and the moving contact are in sliding cooperation.

[0039] In the single-break vacuum switch provided in the present application, a single-break arc extinguishing chamber is adopted, and both contacts of the single-break arc extinguishing chamber are moving contacts. The electromagnetic repulsion mechanism drives the two moving contacts to move synchronously through the insulating transmission mechanism, thereby realizing the closing and opening of the single-break vacuum switch. In this way, the electromagnetic repulsion mechanism is applied to the single-break vacuum switch; at the same time, the electromagnetic repulsion mechanism drives the two moving contacts to move synchronously through the insulating transmission mechanism, so that both moving contacts move, effectively increasing the distance between the two moving contacts in the opening state, that is, increasing the full opening distance of the single-break vacuum switch, so that the above-mentioned single-break vacuum switch can be used as a transmission-grade vacuum switch, that is, the electromagnetic repulsion mechanism can be applied to the transmission-grade vacuum switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0041] Figure 1 A schematic diagram of the structure of a single-break vacuum switch in an open state provided in an embodiment of the present application;

[0042] Figure 2 A schematic structural diagram of a single-break vacuum switch in a closed state provided in an embodiment of the present application;

[0043] Figure 3 A schematic diagram of the structure of a repulsion disk in a single-break vacuum switch provided in an embodiment of the present application;

[0044] Figure 4 A schematic diagram illustrating the connection between the repulsive disk, the second connecting rod, and the sliding guide member in the single-break vacuum switch provided in an embodiment of the present application;

[0045] Figure 5 A front view of a sliding guide member in a single-break vacuum switch provided in an embodiment of the present application;

[0046] Figure 6 A top view of a sliding guide member in a single-break vacuum switch provided in an embodiment of the present application;

[0047] Figure 7 A schematic diagram of a control circuit in a single-break vacuum switch provided in an embodiment of the present application.

[0048] Description of reference numerals:

[0049] 1 is a single-port arc extinguishing chamber, 2 is an electromagnetic repulsion mechanism, 3 is an insulating transmission mechanism, 3a is a first insulating transmission mechanism, and 3b is a second insulating transmission mechanism;

[0050] 11 is a moving contact, 12 is a shielding cover, and 13 is an insulating shell;

[0051] 21 is a first repulsion coil, 22 is a second repulsion coil, 23 is a third repulsion coil, 24 is a repulsion disk, 24a is a first repulsion disk, 24b is a second repulsion disk, 25 is a sliding guide, 26 is a connecting wire, 27 is a charging power supply, 28 is a first switch, 29 is an energy storage capacitor, 210 is a second switch, 211 is a third switch, and 212 is a first control module;

[0052] 241 is the repulsion disk connecting sleeve, 242 is the repulsion disk body, 243 is the hinge hole, and 244 is the slot;

[0053] 251 is the sliding guide fixed end, 252 is the first clearance hole, and 253 is the second clearance hole;

[0054] 31 is a first connecting rod, 32 is a second connecting rod, 33 is a transmission fixing member, 34 is a guide fixing member, and 35 is a hinge shaft. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0056] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to be limiting of the present application. As used in the specification and appended claims of the present application, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context. It should also be understood that in the embodiments of the present application, "one or more" refers to one, two or more; "and / or" describes the association relationship of associated objects, indicating that three relationships may exist; for example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the related objects before and after are in an "or" relationship.

[0057] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0058] The "multiple" involved in the embodiments of the present application means greater than or equal to two. It should be noted that in the description of the embodiments of the present application, the words "first" and "second" are only used for the purpose of distinguishing the description and cannot be understood as indicating or implying relative importance or order.

[0059] The terms "parallel" and "perpendicular" in this application refer to "substantially parallel" and "substantially perpendicular" in actual operation. "Substantially parallel" can be understood as parallel with a certain error, and similarly, "substantially perpendicular" can be understood as perpendicular with a certain error.

[0060] For ease of understanding, the technical terms involved in this application are explained and described below.

[0061] The break of a vacuum switch refers to the contact section between the moving contact and the static contact (the two contacts used to open and close the switch). One contact section is called a single break, two contact sections are called a double break, and more than two contact sections are called multiple break.

[0062] The main working principle of the electromagnetic repulsion mechanism of the vacuum switch is to use the external circuit capacitor to discharge to the driving coil (repulsion coil), so that the driving coil generates pulses to form an alternating magnetic field nearby. The eddy current effect generates induced eddy currents in the corresponding repulsion disk. The magnetic field generated by the coil current and the eddy current forms an electromagnetic repulsion force under the interaction, thereby driving the moving contact of the arc extinguishing chamber to realize the opening and closing of the switch.

[0063] The opening distance of a vacuum switch refers to the distance between the moving and static contacts of the arc extinguishing chamber when the vacuum switch is in the open position.

[0064] The opening time refers to the time between the vacuum switch receiving the opening command and the moment the moving and static contacts separate.

[0065] The dispersion of the opening time refers to the maximum difference in the opening time measured after multiple opening operations of the vacuum switch.

[0066] The initial opening speed refers to the average speed of the vacuum switch in the initial opening stage.

[0067] The single-break vacuum switch provided in the embodiment of the present application is described in detail below.

[0068] The single-break vacuum switch provided in the embodiment of the present application adopts a bidirectional repulsion device (electromagnetic repulsion mechanism) as the circuit breaker driving source, a double-action single-break arc extinguishing chamber as the arc extinguishing device, and an insulating transmission mechanism as the connection mechanism between the driving source and the arc extinguishing chamber device (moving contact). It can not only greatly shorten the circuit breaker opening time and improve the circuit breaker opening speed, but also increase the achievable full opening distance, and apply the electromagnetic repulsion mechanism to the single-break power transmission level.

[0069] like Figure 1 and Figure 2 As shown, the single-break vacuum switch provided in the embodiment of the present application includes: a single-break arc extinguishing chamber 1, an electromagnetic repulsion mechanism 2 and an insulation transmission mechanism 3.

[0070] The single-break arc extinguishing chamber 1 comprises an insulating housing 13, a shielding cover 12, and two movable contacts 11 movably mounted within the insulating housing 13. The shielding cover 12 covers the contact ends of the two movable contacts 11 to protect the insulating housing 13 and assist in arc extinguishing. The movable contacts 11 comprise fixedly connected contact ends and movable contact guide rods. The contact ends are located within the insulating housing 13, while the movable contact guide rods are located outside the insulating housing 13.

[0071] The electromagnetic repulsion mechanism 2 drives the two moving contacts 11 to move synchronously through the insulating transmission mechanism 3 to achieve closing and opening. It should be noted that the two moving contacts 11 are in contact to achieve closing, and the two moving contacts 11 are separated to achieve opening.

[0072] The insulating transmission mechanism 3 insulates and connects the electromagnetic repulsion mechanism 2 and the moving contact 11 .

[0073] In the single-break vacuum switch provided in the above embodiment, a single-break arc extinguishing chamber 1 is adopted, and both contacts of the single-break arc extinguishing chamber 1 are moving contacts 11. The electromagnetic repulsion mechanism 2 drives the two moving contacts 11 to move synchronously through the insulating transmission mechanism 3, thereby realizing the closing and opening of the single-break vacuum switch. In this way, the electromagnetic repulsion mechanism 2 is applied to the single-break vacuum switch; at the same time, the electromagnetic repulsion mechanism 2 drives the two moving contacts 11 to move synchronously through the insulating transmission mechanism 3, so that both moving contacts 11 move, effectively increasing the distance between the two moving contacts 11 in the opening state, that is, increasing the full opening distance of the single-break vacuum switch, so that the above-mentioned single-break vacuum switch can be used as a transmission-grade vacuum switch, that is, the electromagnetic repulsion mechanism can be applied to a transmission-grade vacuum switch.

[0074] In some embodiments, the electromagnetic repulsion mechanism 2 includes: a first repulsion disk 24a, a second repulsion disk 24b and a repulsion coil assembly.

[0075] There are two insulating transmission mechanisms 3, namely the first insulating transmission mechanism 3a and the second insulating transmission mechanism 3b; the first repulsive disk 24a is connected to a moving contact 11 through the first insulating transmission mechanism 3a, and the second repulsive disk 24b is connected to another moving contact 11 through the second insulating transmission mechanism 3b.

[0076] The repulsion coil assembly has a first energized state and a second energized state. When the repulsion coil assembly is in the first energized state, the first repulsion disk 24a and the second repulsion disk 24b move toward each other and drive the two moving contacts 11 to move away from each other to achieve opening; when the repulsion coil assembly is in the second energized state, the first repulsion disk 24a and the second repulsion disk 24b move away from each other and drive the two moving contacts 11 to move toward each other to achieve closing.

[0077] The first repulsive disk 24 a and the second repulsive disk 24 b slide in the same direction, that is, the first repulsive disk 24 a and the second repulsive disk 24 b slide along the same straight line.

[0078] In the above embodiment, the repulsion coil assembly includes: a first repulsion coil 21, a second repulsion coil 22 and a third repulsion coil 23; wherein the first repulsion coil 21, the second repulsion coil 22 and the third repulsion coil 23 are distributed in sequence along the sliding direction of the first repulsion disk 24a, the first repulsion disk 24a is located between the first repulsion coil 21 and the second repulsion coil 22, and the second repulsion disk 24b is located between the second repulsion coil 22 and the third repulsion coil 23; the first repulsion coil 21 and the third repulsion coil 23 are connected in series; when the first repulsion coil 21 and the third repulsion coil 23 are energized at the same time, the repulsion coil assembly is in a first energized state; when the second repulsion coil 22 is energized, the repulsion coil assembly is in a second energized state.

[0079] It should be noted that after the first and third repulsion coils 21 and 23 are activated, the currents flowing through them vary. After the first repulsion coil 21 is activated, the current variation generates an induced current in the first repulsion disc 24a. The current in the first repulsion coil 21 is in the opposite direction to the current in the first repulsion disc 24a. The first repulsion coil 21 and the first repulsion disc 24a repel each other, causing the first repulsion disc 24a to move away from the first repulsion coil 21. Correspondingly, after the third repulsion coil 23 is activated, the current variation generates an induced current in the second repulsion disc 24b. The current in the third repulsion coil 23 is in the opposite direction to the current in the second repulsion disc 24b. The third repulsion coil 23 and the second repulsion disc 24b repel each other, causing the second repulsion disc 24b to move away from the third repulsion coil 23, thereby achieving tripping.

[0080] After the second repulsion coil 22 is energized, the current flowing through the second repulsion coil 22 changes. After the second repulsion coil 22 is energized, due to the change in current, both the first repulsion disc 24a and the second repulsion disc 24b generate induced currents. The directions of the currents in the first repulsion disc 24a and the second repulsion disc 24b are opposite to the direction of the current in the second repulsion coil 22. The second repulsion coil 22 and the first repulsion disc 24a repel each other, and the second repulsion coil 22 and the second repulsion disc 24b repel each other, causing both the first repulsion disc 24a and the second repulsion disc 24b to move away from the second repulsion coil 22, thereby achieving circuit closure.

[0081] The above-mentioned repulsion coil assembly only requires three coils, namely the first repulsion coil 21, the second repulsion coil 22 and the third repulsion coil 23, which simplifies the structure of the repulsion coil assembly, reduces the volume of the repulsion coil assembly, and reduces the cost of the repulsion coil assembly, thereby reducing the volume and cost of the entire single-port vacuum switch.

[0082] In actual situations, the repulsion coil assembly may also be selected to have other structures, which is not limited in this embodiment.

[0083] In the above embodiment, the first repulsive disk 24a and the second repulsive disk 24b are both repulsive disks 24. Figure 3 As shown, the repulsion disk 24 includes: a repulsion disk connecting sleeve 241 and a repulsion disk body 242 ; wherein, the repulsion disk body 242 is fixedly connected to one end of the repulsion disk connecting sleeve 241 , and the repulsion disk body 242 is externally mounted on the repulsion disk connecting sleeve 241 .

[0084] Combine Figure 1-Figure 3 As shown, the repulsion disk body 242 of the first repulsion disk 24a and the repulsion disk body 242 of the second repulsion disk 24b are arranged opposite to each other; the repulsion disk body 242 of the first repulsion disk 24a is located between the first repulsion coil 21 and the second repulsion coil 22, and the repulsion disk body 242 of the second repulsion disk 24b is located between the second repulsion coil 22 and the third repulsion coil 23; the first repulsion coil 21 is externally mounted on the repulsion disk connecting sleeve 241 of the first repulsion disk 24a, and the third repulsion coil 23 is externally mounted on the repulsion disk connecting sleeve 241 of the second repulsion disk 22.

[0085] In order to ensure that the first repulsion disk 24a and the second repulsion disk 24b move along the set direction, the repulsion coil assembly also includes a sliding guide 25. The repulsion disk connecting sleeve 241 of the first repulsion disk 24a and the second repulsion disk 24b can be slidably mounted on the sliding guide 25, and the second repulsion coil 22 is mounted on the sliding guide 25.

[0086] For the convenience of sliding sleeve setting, can select sliding guide 25 to be rod, the cross section of this rod is circular. Certainly, also can select sliding guide 25 to be other structures, present embodiment does not limit this.

[0087] In order to prevent the first repulsion coil 21 , the second repulsion coil 22 and the third repulsion coil 23 from moving during operation, the first repulsion coil 21 , the second repulsion coil 22 and the third repulsion coil 23 may be fixed relative to the sliding conductive member 25 .

[0088] like Figure 4 and Figure 5 As shown, both ends of the sliding conductive member 25 are sliding guide fixed ends 251 , and the sliding guide fixed ends 251 are fixed on a certain component, that is, both ends of the sliding conductive member 25 are fixedly arranged.

[0089] In order to improve the guiding function of the sliding guide 25, it is possible to select one of the repulsive disk connecting sleeve 241 and the sliding guide 25 to be provided with a protrusion and the other to be provided with a sliding groove that slides with the protrusion.

[0090] In order to simplify the structure, the moving directions of the first repulsive disk 24a and the second repulsive disk 24b can be selected to be parallel to the moving direction of the movable contact 11, so that a stable bidirectional driving repulsive force can be output in the horizontal direction.

[0091] Of course, the moving directions of the first repulsive disk 24 a and the second repulsive disk 24 b and the moving direction of the movable contact 11 may be relatively inclined or perpendicular, and this embodiment does not limit this.

[0092] During the opening process of the single-break vacuum switch, the first repulsion coil 21 and the third repulsion coil 23 are energized simultaneously, generating a repulsive force that pushes the first repulsion disc 24a and the second repulsion disc 24b to slide toward the center on the sliding guide 25, driving the insulation transmission mechanism 3 to move, causing the moving contact of the single-port interrupter (double-action interrupter) 1 to move toward the sides, completing the opening process. During the closing process, the second repulsion coil 22 is energized, generating a repulsive force that pushes the first repulsion disc 24a and the second repulsion disc 24b to slide toward the center on the sliding guide 25, driving the insulation transmission mechanism 3 to move, causing the moving contact 11 of the single-port interrupter (double-action interrupter) 1 to move toward the center, completing the closing process.

[0093] In the embodiment of the present application, the single-break vacuum switch further includes a control circuit to facilitate control of the energization of the first repulsion coil 21, the second repulsion coil 22, and the third repulsion coil 23. When the single-break vacuum switch needs to be opened, the control circuit is configured to simultaneously energize the first repulsion coil 21 and the third repulsion coil 23; when the single-break vacuum switch needs to be closed, the control circuit is configured to energize the second repulsion coil 22.

[0094] like Figure 7As shown, the control circuit includes: a charging power supply 27, an energy storage capacitor 29, a first switch 28, a second switch 210, a third switch 211, a first controller, a second controller and a third controller.

[0095] In the control circuit, the charging power supply 27 and the first switch 28 are connected in series to form a first branch, the second switch 28, the first repulsion coil 21 and the third repulsion coil 23 are connected in series to form a second branch, and the third switch 211 and the second repulsion coil 22 form a third branch; the first branch, the second branch, the third branch and the capacitor 29 are all arranged in parallel; the control end of the first switch 28 is connected to the first controller, the control end of the second switch 210 is connected to the second controller, and the control end of the third switch 211 is connected to the third controller.

[0096] When the single-break vacuum switch needs to be opened, the first controller is used to control the first switch 28 to be closed, the second controller is used to control the second switch 210 to be opened, and the third controller is used to control the third switch 211 to be opened, so that the charging power supply can charge the capacitor 29. When the voltage of the capacitor 29 reaches U1, the first controller is used to control the first switch 28 to be opened, and the second controller is used to control the second switch 210 to be closed, so that the capacitor 29 can supply power to the first repulsion coil 21 and the third repulsion coil 23. When the voltage of the capacitor 29 drops to U2, the second controller is used to control the second switch 210 to be opened, and the third controller is used to control the third switch 211 to be closed, so that the capacitor 29 can supply power to the second repulsion coil 22. When the voltage of the capacitor 29 drops to zero, the third controller is used to control the third switch 211 to be opened. Wherein, (U1-U2) / (Z1+Z3)=U2 / Z2, Z1 is the impedance of the first repulsion coil 21, Z2 is the impedance of the second repulsion coil 22, and Z3 is the impedance of the third repulsion coil 23.

[0097] It should be noted that the process in which the capacitor 29 supplies power to the first repulsion coil 21 and the third repulsion coil 23 is the discharge process of the capacitor 29 .

[0098] The control circuit enables the opening and closing of a single-break vacuum switch to be completed with a single charge of the capacitor, thereby effectively simplifying the control.

[0099] The types of the first switch 28, the second switch 210, and the third switch 211 are selected based on actual conditions. For example, the first switch 28 is a DC contactor, and the second switch 210 and the third switch 211 are both IGBTs. Of course, the first switch 28, the second switch 210, and the third switch 211 may also be of other types, and this embodiment is not limited thereto.

[0100] The first controller, the second controller and the third controller can be arbitrarily combined and integrated. For example, the second controller and the third controller are integrated into the first control module 212, or the first controller, the second controller and the third controller are integrated into the second control module.

[0101] In the single-break vacuum switch described above, the impedances of the first repulsion coil 21, the second repulsion coil 22, and the third repulsion coil 23 are selected based on actual conditions. To simplify control, the impedances of the first repulsion coil 21, the second repulsion coil 22, and the third repulsion coil 23 can be equal, i.e., Z1 = Z2 = Z3. Of course, the impedances of at least two of the first repulsion coil 21, the second repulsion coil 22, and the third repulsion coil 23 can also be unequal, but this is not a limitation in the present embodiment.

[0102] In actual situations, the control circuit may be selected to have other structures, and is not limited to the above embodiment. In other embodiments, the electromagnetic repulsion mechanism 2 may be selected to have other structures, which is not limited in this embodiment.

[0103] In some embodiments, the insulating transmission mechanism 3 includes: a first connecting rod 31, a second connecting rod 32 and a transmission fixing member 33, wherein the first end of the first connecting rod 31 is hinged to the moving contact 11, the second end of the first connecting rod 31 is hinged to the first end of the second connecting rod 32, the second end of the second connecting rod 32 is hinged to the repulsion disk 24, the middle part of the first connecting rod 31 is hinged to the transmission fixing member 33, and at least one of the first connecting rod 31 and the second connecting rod 32 is an insulating member.

[0104] It should be noted that the transmission fixing member 33 is fixed. When the electromagnetic repulsion mechanism 2 includes the sliding guide member 25, the transmission fixing member 33 and the sliding guide member 25 are relatively fixed. Components other than the first connecting rod 31 and the second connecting rod 32 in the insulating transmission mechanism 3 may also be insulating members to provide insulation.

[0105] In the above embodiment, the hinge position between the first connecting rod 31 and the moving contact 11 is the first hinge position, the hinge position between the second connecting rod 32 and the repulsive disk 24 is the second hinge position, and the hinge position between the first connecting rod 31 and the transmission fixing member 33 is the third hinge position. In the open state, the second hinge position, the third hinge position, and the first hinge position are sequentially distributed in the direction of movement of the moving contact 11. Alternatively, in the open state, the third hinge position and the first hinge position are distributed perpendicularly to the direction of movement of the moving contact 11, that is, the first connecting rod 31 is perpendicular to the direction of movement of the moving contact 11. In the closed state, the second hinge position, the first hinge position, and the third hinge position are sequentially distributed in the direction of movement of the moving contact 11.

[0106] In the above embodiment, the insulating transmission mechanism 3 is provided so that the electromagnetic repulsion mechanism 2 can output a stable bidirectional driving repulsion in the horizontal direction; moreover, the full opening distance of the single-break vacuum switch can be changed by changing the transmission ratio of the insulating transmission mechanism 3.

[0107] The insulating transmission mechanism 3 can amplify the displacement of the repulsion disk 24. Specifically, the first end of the first connecting rod 31 is farther from the hinge position between the first connecting rod 31 and the transmission fixing member 33 than the second end. This can reduce the size of the electromagnetic repulsion mechanism 2, thereby reducing its volume and cost.

[0108] In actual situations, the insulating transmission mechanism 3 may not amplify the displacement of the repulsive disk 24 , or the insulating transmission mechanism 3 may reduce the displacement of the repulsive disk 24 . The present invention is not limited to the above embodiments.

[0109] In the above embodiment, the second end of the second connecting rod 32 and the repulsion disk 24 are hingedly connected via a connecting pin 35. To ensure that the repulsion disk 24 slides along the sliding guide 25, the sliding guide 25 is provided with a clearance cavity, a first clearance hole 252, and a second clearance hole 253. The first clearance hole 252 and the second clearance hole 253 are both connected to the clearance cavity. The connecting pin 35 passes through the clearance cavity and the second clearance hole 253. The connecting pin 35 and the second clearance hole 253 slidably engage with each other. One end of the second connecting rod 32 extends into the clearance cavity through the first clearance hole 252 and is hingedly connected to the connecting pin 35. In this way, the sliding engagement of the connecting pin 35 and the second clearance hole 253 forms a guide structure to ensure that the repulsion disk 24 slides along the sliding guide 25.

[0110] The first paving hole 252 and the second paving hole 253 are both bar-shaped holes. For example, the first paving hole 252 and the second paving hole 253 can be waist-shaped holes or holes of other shapes, which is not limited in this embodiment.

[0111] It should be noted that the hinges mentioned in this article can all be achieved through connecting pins.

[0112] In the above embodiment, in order to facilitate the connection between the second connecting rod 32 and the repulsive disk 24, the repulsive disk 24 is provided with a slot 244, and the second end of the second connecting rod 32 is located in the slot 244. It should be noted that the connecting pin 35 connecting the second connecting rod 32 and the repulsive disk 24 passes through the slot 244. Figure 6 As shown, in order to ensure that the connecting pin 35 connecting the second connecting rod 32 and the repulsion disk 24 passes through the slot 244, the repulsion disk 24 is provided with a hinge hole 243, and the connecting pin 35 connecting the second connecting rod 32 and the repulsion disk 24 is arranged in the hinge hole 243, and the hinge hole 243 and the slot 244 are connected.

[0113] In order to ensure that the moving contact 11 moves along a set direction, the insulating transmission mechanism 3 further includes a guide fixing member 34 , which is in sliding fit with the moving contact 11 .

[0114] The guide fixing member 34 is fixedly disposed. When the electromagnetic repulsion mechanism 2 includes a sliding guide member 25, the guide fixing member 34 and the sliding guide member 25 are relatively fixed. For example, one end of the guide fixing member 34 is fixedly disposed, and the other end of the guide fixing member 34 is provided with a guide hole, through which the movable contact 11 passes, and the movable contact 11 and the guide hole are slidably engaged.

[0115] The guide fixing member may be a rod, and the cross section of the rod may be circular or square, etc., which is not limited in this embodiment.

[0116] In the above embodiment, in order to simplify the structure, the guide fixing member 34, the sliding guide member 25 and the transmission fixing member 33 may be fixed on the same component.

[0117] Based on the above content, in the single-break vacuum switch provided in the embodiment of the present application, the full-open distance of the vacuum switch can be increased to more than twice that of the conventional repulsion mechanism, and the electromagnetic repulsion mechanism can be expanded to be applied to the vacuum switch of the single-break power transmission level; the insulating transmission mechanism can transmit the repulsive force generated by the electromagnetic repulsion mechanism to the two moving contacts 11 of the single-break arc extinguishing chamber 1 to realize the opening and closing operations, and also has the function of electrically connecting the isolation mechanism and the arc extinguishing chamber.

[0118] The single-break vacuum switch provided in the embodiment of the present application may be a vacuum circuit breaker or a vacuum load switch, which is not limited in this embodiment.

[0119] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A single-break vacuum switch, characterized in that: include: Single-break arc extinguishing chamber, electromagnetic repulsion mechanism and insulation transmission mechanism; The single-break arc extinguishing chamber comprises: an insulating shell, two movable contacts movably arranged on the insulating shell; The electromagnetic repulsion mechanism drives the two moving contacts to move synchronously through the insulating transmission mechanism to achieve closing and opening; The electromagnetic repulsion mechanism includes: a first repulsion disk, a second repulsion disk and a repulsion coil assembly; the repulsion coil assembly includes: a first repulsion coil, a second repulsion coil and a third repulsion coil; the repulsion coil assembly also includes a sliding guide; There are two insulating transmission mechanisms, namely a first insulating transmission mechanism and a second insulating transmission mechanism. The first repulsive disk is connected to one of the moving contacts via the first insulating transmission mechanism, and the second repulsive disk is connected to the other moving contact via the second insulating transmission mechanism. The repulsion coil assembly has: a first energized state in which the first repulsion disc and the second repulsion disc are driven to move toward each other and drive the two moving contacts to move away from each other; and a second energized state in which the first repulsion disc and the second repulsion disc are driven to move away from each other and drive the two moving contacts to move toward each other; the movement direction of the first repulsion disc and the second repulsion disc is parallel to the movement direction of the moving contact; The device further includes a control circuit; wherein, when the single-break vacuum switch needs to be opened, the control circuit is used to control the first repulsion coil and the third repulsion coil to be energized simultaneously; when the single-break vacuum switch needs to be closed, the control circuit is used to control the second repulsion coil to be energized; The control circuit includes: a charging power supply, an energy storage capacitor, a first switch, a second switch, a third switch, a first controller, a second controller and a third controller; The charging power supply and the first switch are connected in series to form a first branch, the second switch, the first repulsion coil, and the third repulsion coil are connected in series to form a second branch, and the third switch and the second repulsion coil form a third branch; the first branch, the second branch, the third branch, and the capacitor are all connected in parallel; The control end of the first switch is connected to the first controller, the control end of the second switch is connected to the second controller, and the control end of the third switch is connected to the third controller; When the single-break vacuum switch needs to be opened, the first controller is used to control the first switch to be closed, the second controller is used to control the second switch to be opened, and the third controller is used to control the third switch to be opened, so that the charging power supply charges the capacitor; when the voltage of the capacitor reaches U1, the first controller is used to control the first switch to be opened, and the second controller is used to control the second switch to be closed, so that the capacitor supplies power to the first repulsion coil and the third repulsion coil; when the voltage of the capacitor drops to U2, the second controller is used to control the second switch to be opened, and the third controller is used to control the third switch to be closed, so that the capacitor supplies power to the second repulsion coil; when the voltage of the capacitor drops to zero, the third controller is used to control the third switch to be opened; Where, (U1-U2) / (Z1+Z3)=U2 / Z2, Z1 is the impedance of the first repulsion coil, Z2 is the impedance of the second repulsion coil, and Z3 is the impedance of the third repulsion coil; Z1= Z2= Z3; The first repulsion disk and the second repulsion disk are both repulsion disks; The insulating transmission mechanism comprises: a first connecting rod, a second connecting rod and a transmission fixing member; The first end of the first connecting rod is hinged to the moving contact, the second end of the first connecting rod is hinged to the first end of the second connecting rod, the second end of the second connecting rod is hinged to the repulsive disk, and the middle portion of the first connecting rod is hinged to the transmission fixing member; at least one of the first connecting rod and the second connecting rod is an insulating member; The first end of the first connecting rod is farther away from the hinge position between the first connecting rod and the transmission fixing member than the second end; The second end of the second connecting rod and the repulsion disk are hingedly connected by a connecting pin. The sliding guide is provided with a clearance cavity, and a first clearance hole and a second clearance hole both communicating with the clearance cavity. The connecting pin passes through the clearance cavity and the second clearance hole. The connecting pin and the second clearance hole are slidably engaged. One end of the second connecting rod extends into the clearance cavity through the first clearance hole and is hingedly connected to the connecting pin. The repulsion disk is provided with a slot, and the second end of the second connecting rod is located in the slot; The insulating transmission mechanism further includes a guide fixing member, the guide fixing member and the sliding guide member are relatively fixed, and the guide fixing member and the moving contact are in sliding cooperation.

2. The single-break vacuum switch according to claim 1, characterized in that: in, The first repulsion coil, the second repulsion coil, and the third repulsion coil are sequentially distributed along the sliding direction of the first repulsion disk, the first repulsion disk is located between the first repulsion coil and the second repulsion coil, and the second repulsion disk is located between the second repulsion coil and the third repulsion coil; The first repulsion coil and the third repulsion coil are connected in series; when the first repulsion coil and the third repulsion coil are energized at the same time, the repulsion coil assembly is in the first energized state; when the second repulsion coil is energized, the repulsion coil assembly is in the second energized state.

3. The single-break vacuum switch according to claim 2, characterized in that: The first repulsion disk and the second repulsion disk both include: a repulsion disk connecting sleeve and a repulsion disk body; Wherein, the repulsion disc main body is fixedly connected to one end of the repulsion disc connecting sleeve, and the repulsion disc main body is externally fitted on the repulsion disc connecting sleeve; The repulsion disc body of the first repulsion disc and the repulsion disc body of the second repulsion disc are arranged opposite to each other; the repulsion disc body of the first repulsion disc is located between the first repulsion coil and the second repulsion coil, and the repulsion disc body of the second repulsion disc is located between the second repulsion coil and the third repulsion coil; The first repulsion coil is externally mounted on the repulsion disk connecting sleeve of the first repulsion disk, and the third repulsion coil is externally mounted on the repulsion disk connecting sleeve of the second repulsion disk.

4. The single-break vacuum switch according to claim 3, characterized in that: The repulsion disk connecting sleeve is slidably mounted on the sliding guide, and the second repulsion coil is mounted on the sliding guide; Wherein, the first repulsion coil, the second repulsion coil and the third repulsion coil are all relatively fixed to the sliding guide; And / or, one of the repulsion disk connecting sleeve and the sliding guide is provided with a protrusion, and the other is provided with a sliding groove that slides with the protrusion.

5. The single-break vacuum switch according to claim 1, characterized in that: The first switch is a DC contactor, and the second switch and the third switch are both IGBTs; And / or, the second controller and the third controller are integrated into a first control module, or the first controller, the second controller and the third controller are integrated into a second control module.

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