A contactor structure

Abstract

The application discloses a contactor structure, which comprises a shell and a moving iron core, an electromagnetic coil, a neutral line static contact, a neutral line moving contact, a phase line static contact and a phase line moving contact which are arranged in the shell; the neutral line moving contact and the phase line moving contact are fixedly arranged on the moving iron core; the neutral line static contact and the phase line static contact are arranged in the shell in correspondence with the neutral line moving contact and the phase line moving contact; one end of the neutral line static contact close to the neutral line moving contact and / or one end of the neutral line moving contact close to the neutral line static contact are elastically deformable structures; a first distance between the neutral line static contact and the neutral line moving contact is smaller than a second distance between the phase line static contact and the phase line moving contact; and the electromagnetic coil is arranged in correspondence with the moving iron core. The neutral point voltage drift problem caused by the neutral line being separated first or the neutral line being combined last compared with the other three phases is effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and more particularly to a contactor structure. Background Technology

[0002] The electrical equipment in a substation generally includes single-phase loads and three-phase loads. Especially for important loads, such as transformer air-cooling systems and DC systems used in substations, dual power supply methods are adopted to ensure their operational reliability.

[0003] like Figure 1 As shown, during normal system power supply, to prevent circulating currents and mutual interference from faults in the two power supply systems S1 and S2, the bus tie switch QS is set to the open state. When the dual-power supply load L5 (transformer air-cooled system, substation DC system, etc.) is operating normally, the selector switch K controls one of the contactors KM5 or KM6 to close while the other opens. When the main power supply to L5 fails, K detects and controls the main power supply switch to open while the other power supply switch closes to ensure uninterrupted power supply to critical loads. However, due to manufacturing processes and mechanical wear, it is impossible to guarantee that the three-phase switch contacts operate simultaneously during the closing and opening of contactors KM5 and KM6. Therefore, in the existing technology, to prevent uneven power flow distribution within the power system caused by inconsistent operation of the three-phase switch contacts, the load neutral line N must remain connected throughout the closing and opening of the three-phase switches.

[0004] However, for dual-powered loads, this method requires the neutral lines N of both power sources to be always connected. This results in the neutral lines S1 and S2 of the two power systems being connected at the load end, causing various signals in the two systems to interfere with each other. Furthermore, since the two single-phase loads L3 and L4 are powered from different phases, an unbalanced current will be generated between the two power sources. This unbalanced current will form a loop with the neutral line N through grounding points GND1 and GND2. When this unbalanced current is too large, it will cause the protection system to misjudge and issue a trip command, leading to a power outage. Connecting the neutral lines of two completely independent power systems at the load end reduces the accuracy of the circuit protection system's judgment and may even cause the protection system to malfunction, disconnecting the power supply to both the normal and faulty systems, expanding the fault range, and severely affecting the reliability of the power supply. Summary of the Invention

[0005] The purpose of this invention is to provide a contactor structure that can effectively avoid the neutral point voltage drift problem caused by the neutral line separating earlier than the other three phases.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Provided is a contactor structure, comprising a shell and a moving iron core, an electromagnetic coil, a neutral line static contact, a neutral line moving contact, a phase line static contact and a phase line moving contact mounted inside the shell;

[0008] The neutral line moving contact and the phase line moving contact are fixedly mounted on the moving iron core;

[0009] The neutral line static contact and the phase line static contact are correspondingly arranged inside the shell, one end of the neutral line static contact close to the neutral line moving contact and / or one end of the neutral line moving contact close to the neutral line static contact is an elastically deformable structure, and a first distance between the neutral line static contact and the neutral line moving contact is smaller than a second distance between the phase line static contact and the phase line moving contact;

[0010] The electromagnetic coil is arranged corresponding to the moving iron core, and is used to generate a strong magnetic field to drive the moving iron core to move when energized, so that the neutral line moving contact and the neutral line static contact and the phase line moving contact and the phase line static contact are in abutment and conductive.

[0011] Optionally, the neutral line static contact, the neutral line moving contact, the phase line static contact and the phase line moving contact are spring sheet structures, and the neutral line static contact, the neutral line moving contact, the phase line static contact and the phase line moving contact are elastically deformable.

[0012] Optionally, one end of the neutral line static contact away from the neutral line moving contact is a rotatable structure, so that the neutral line static contact can rotate around the end away from the neutral line moving contact.

[0013] Optionally, a rotating shaft is arranged on the shell corresponding to the end of the neutral line static contact away from the neutral line moving contact, and the neutral line static contact is rotatably connected with the rotating shaft.

[0014] Optionally, a spring is arranged on one side of the neutral line static contact close to the neutral line moving contact, one end of the spring is fixedly connected with the neutral line static contact, and the other end is fixedly connected with the shell.

[0015] Optionally, when the spring is not compressed, the first distance between the neutral line static contact and the neutral line moving contact is smaller than the second distance.

[0016] Optionally, the phase line static contact comprises an A-phase static contact, a B-phase static contact and a C-phase static contact; and the phase line moving contact comprises an A-phase moving contact, a B-phase moving contact and a C-phase moving contact.

[0017] Optionally, the contactor structure further comprises a normally closed auxiliary moving contact, a normally closed auxiliary static contact, a normally open auxiliary moving contact and a normally open auxiliary static contact.

[0018] Optionally, a static iron core is arranged inside the electromagnetic coil to enhance the electromagnetic intensity of the strong magnetic field generated by the electromagnetic coil.

[0019] Optionally, the bottom of the shell is further provided with a fixed clamping seat, and the fixed clamping seat is provided with a dovetail groove away from one side of the shell.

[0020] The beneficial effects of the present application are: by setting the first distance between the neutral line static contact and the neutral line dynamic contact to be smaller than the second distance between the phase line static contact and the phase line dynamic contact, the closure of the neutral line dynamic contact and the neutral line static contact is before the closure of the phase line static contact and the phase line dynamic contact, and the neutral line dynamic contact and the neutral line static contact are conducted before the phase line static contact and the phase line dynamic contact are conducted during the closing process of the contactor; during the opening process of the contactor, the phase line static contact and the phase line dynamic contact are separated before the neutral line dynamic contact and the neutral line static contact, thereby effectively avoiding the neutral point voltage drift problem caused by the neutral line being separated earlier than the other three phases or the neutral line being connected later than the other three phases. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application will be further described in detail below according to the drawings and embodiments.

[0022] Figure 1 It is a schematic diagram of a circuit powered by dual power supply in the prior art.

[0023] Figure 2 It is a structural schematic diagram of the contactor structure described in the embodiment of the present application.

[0024] Figure 3 It is a structural diagram of the contactor structure described in the embodiment of the present application.

[0025] Figure 4 It is an internal structural schematic diagram of the contactor structure described in the embodiment of the present application.

[0026] Figure 5 It is a top view schematic diagram of the contactor structure described in the embodiment of the present application.

[0027] In the drawings:

[0028] 1, housing; 101, fixed seat; 102, A-phase outgoing line terminal; 103, B-phase outgoing line terminal; 104, C-phase outgoing line terminal; 105, A-phase incoming line terminal; 106, B-phase incoming line terminal; 107, C-phase incoming line terminal; 108, N-phase outgoing line terminal; 109, N-phase incoming line terminal; 110, electromagnetic coil power supply A1 terminal; 111, electromagnetic coil power supply A2 terminal; 112, normally open auxiliary contact terminal; 113, normally closed auxiliary contact terminal; 2, moving iron core; 3, stationary iron core; 4, electromagnetic coil; 5, neutral line stationary contact; 51, spring; 6, neutral line moving contact; 7, phase line stationary contact; 71, A-phase stationary contact; 72, B-phase stationary contact; 73, C-phase stationary contact; 8, phase line moving contact; 81, A-phase moving contact; 82, B-phase moving contact; 83, C-phase moving contact; 9, normally closed auxiliary moving contact; 10, normally closed auxiliary stationary contact; 11, normally open auxiliary moving contact; 12, normally open auxiliary stationary contact. DETAILED DESCRIPTION

[0029] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0030] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] The contactor refers to an electric appliance in industrial electricity which uses the current flowing through the coil to generate a magnetic field, so that the contact is closed to achieve the control of the load. The working principle of the contactor is: when the contactor coil is powered on, the coil current will generate a magnetic field, the generated magnetic field will generate electromagnetic attraction force to attract the moving iron core, and drive the contactor contact to act, the normally closed contact is opened, the normally open contact is closed, and the two are linked. When the coil is powered off, the electromagnetic attraction force disappears, and the armature releases under the action of the release spring, so that the contact is restored, the normally open contact is opened, and the normally closed contact is closed.

[0032] As Figures 2 to 5As shown in this embodiment, the contactor structure of the present invention includes a housing 1, a moving iron core 2, an electromagnetic coil 4, a neutral line stationary contact 5, a neutral line moving contact 6, a phase line stationary contact 7, and a phase line moving contact 8.

[0033] The housing 1 is used to house and fix the moving iron core 2, the electromagnetic coil 4, the neutral line stationary contact 5, the neutral line moving contact 6, the phase line stationary contact 7, and the phase line moving contact 8. The moving iron core 2, the electromagnetic coil 4, the neutral line stationary contact 5, the neutral line moving contact 6, the phase line stationary contact 7, and the phase line moving contact 8 are arranged inside the housing 1 to provide protection.

[0034] like Figure 2 As shown, in this embodiment of the invention, the neutral moving contact 6 and the phase moving contact 8 are fixedly mounted on the moving iron core 2, and the neutral moving contact 6 and the phase moving contact 8 can move with the movement of the moving iron core 2. For example, when the moving iron core 2 is attracted by the electromagnetic coil 4, it causes the neutral moving contact 6 to close and conduct with the neutral stationary contact 5, and the phase moving contact 8 to close and conduct with the phase stationary contact 7.

[0035] The neutral line stationary contact 5 and the neutral line moving contact 6 are correspondingly arranged inside the housing 1, and the phase line stationary contact 7 and the phase line moving contact 8 are correspondingly arranged inside the housing 1. The corresponding arrangement mainly refers to the fact that the contact points of the neutral line stationary contact 5 and the neutral line moving contact 6, and the phase line stationary contact 7 and the phase line moving contact 8 are directly opposite each other. When the moving iron core 2 drives the neutral line moving contact 6 and the phase line moving contact 8 to operate, the contact points of the neutral line moving contact 6 and the neutral line stationary contact 5, and the phase line moving contact 8 and the phase line stationary contact 7, can correctly make contact and conduct electricity.

[0036] The end of the neutral line stationary contact 5 near the neutral line moving contact 6 and / or the end of the neutral line moving contact 6 near the neutral line stationary contact 5 is an elastically deformable structure, and the first distance between the neutral line stationary contact 5 and the neutral line moving contact 6 is less than the second distance between the phase line stationary contact 7 and the phase line moving contact 8.

[0037] Specifically, in the contactor's de-energized state (non-operating state), the first distance between the neutral stationary contact 5 and the neutral moving contact 6 is less than the second distance between the phase stationary contact 7 and the phase moving contact 8. That is, during contactor closing, the neutral moving contact 6 and the neutral stationary contact 5 close before the phase stationary contact 7 and the phase moving contact 8 close; the neutral moving contact 6 and the neutral stationary contact 5 conduct before the phase stationary contact 7 and the phase moving contact 8 conduct. During contactor opening, the phase stationary contact 7 and the phase moving contact 8 separate before the neutral moving contact 6 and the neutral stationary contact 5, thus effectively avoiding neutral point voltage drift caused by the neutral line separating before or after the other three phases.

[0038] The neutral line static contact 5 and the neutral line dynamic contact 6 are at least one of an elastically deformable structure, so as to be deformed when the neutral line dynamic contact 6 and the neutral line static contact 5 are closed, so as to avoid hindering the movement of the dynamic iron core 2, and causing the phase line dynamic contact 8 and the phase line static contact 7 to be unable to be normally closed.

[0039] In the embodiment of the application, the electromagnetic coil 4 is arranged corresponding to the dynamic iron core 2, and is used to generate a strong magnetic field to drive the dynamic iron core 2 to move when being electrified, so as to make the neutral line dynamic contact 6 and the neutral line static contact 5 and the phase line dynamic contact 8 and the phase line static contact 7 abut and conduct. Further, the static iron core 3 is arranged corresponding to the electromagnetic coil 4 inside the electromagnetic coil 4, and is used to enhance the electromagnetic intensity of the strong magnetic field generated by the electromagnetic coil 4. By arranging the electromagnetic coil 4 and the static iron core 3, the dynamic iron core 2 can be attracted to the position of the static iron core 3 by the strong magnetic field generated by the electromagnetic coil 4 when the electromagnetic coil 4 is electrified, and then the neutral line dynamic contact 6 and the phase line dynamic contact 8 are driven to move, the contactor is closed, and when the electromagnetic coil 4 is de-energized, the dynamic iron core 2 is pushed back to the disconnected position by the compression spring arranged inside the shell 1, so that the neutral line dynamic contact 6 and the phase line dynamic contact 8 are separated from the neutral line static contact 5 and the phase line dynamic contact 8.

[0040] In the embodiment of the application, the first distance between the neutral line static contact 5 and the neutral line dynamic contact 6 is arranged to be smaller than the second distance between the phase line static contact 7 and the phase line dynamic contact 8, so that in the process of closing the contactor, the neutral line dynamic contact 6 and the neutral line static contact 5 are closed before the phase line static contact 7 and the phase line dynamic contact 8, and the neutral line dynamic contact 6 and the neutral line static contact 5 are conducted before the phase line static contact 7 and the phase line dynamic contact 8 are conducted; in the process of disconnecting the contactor, the phase line static contact 7 and the phase line dynamic contact 8 are separated before the neutral line dynamic contact 6 and the neutral line static contact 5, thereby effectively avoiding the problem of neutral point voltage drift caused by the neutral line being separated before the other three phases or the neutral line being connected after the other three phases.

[0041] In an optional example, the neutral line static contact 5, the neutral line dynamic contact 6, the phase line static contact 7 and the phase line dynamic contact 8 are spring sheet structures, and the neutral line static contact 5, the neutral line dynamic contact 6, the phase line static contact 7 and the phase line dynamic contact 8 can be elastically deformed.

[0042] By setting the neutral line static contact 5, the neutral line moving contact 6, the phase line static contact 7 and the phase line moving contact 8 as spring sheet structures, and setting the stroke of the moving iron core 2 slightly larger than the second distance between the phase line static contact 7 and the phase line moving contact 8, a certain deformation is generated when the neutral line static contact 5, the neutral line moving contact 6, the phase line static contact 7 and the phase line moving contact 8 are closed, so that better contact closing is achieved, the closing effect of the neutral line static contact 5, the neutral line moving contact 6, the phase line static contact 7 and the phase line moving contact 8 is ensured, and further, the problem of poor contact of the neutral line static contact 5, the neutral line moving contact 6, the phase line static contact 7 and the phase line moving contact 8 caused by the distance between the neutral line static contact 5 and the neutral line moving contact 6 and the distance between the phase line static contact 7 and the phase line moving contact 8 becoming larger due to wear during use is avoided.

[0043] In an optional example of the application, the end of the neutral line static contact 5 away from the neutral line moving contact 6 is a rotatable structure, so that the neutral line static contact 5 can rotate around the end away from the neutral line moving contact 6.

[0044] By setting the end of the neutral line static contact 5 as a rotatable structure, the resistance to the movement of the moving iron core 2 can be reduced under the premise of ensuring the closing effect of the neutral line static contact 5 and the neutral line moving contact 6 during the operation of the contactor.

[0045] Further, the rotatable structure can be a rotating shaft provided on the shell 1 corresponding to the end of the neutral line static contact 5 away from the neutral line moving contact 6, and the neutral line static contact 5 is rotatably connected to the rotating shaft.

[0046] Further, a spring 51 is provided on the side of the neutral line static contact 5 close to the neutral line moving contact 6, one end of the spring 51 is fixedly connected to the neutral line static contact 5, and the other end is fixedly connected to the shell 1, and the first distance between the neutral line static contact 5 and the neutral line moving contact 6 is smaller than the second distance when the spring 51 is not compressed. By setting the spring 51, the reset of the neutral line static contact 5 can be assisted, and the working reliability of the neutral line static contact 5 is ensured.

[0047] As shown in Figure 3 , 4 , the phase line static contact 7 includes an A-phase static contact 71, a B-phase static contact 72 and a C-phase static contact 73; the phase line moving contact 8 includes an A-phase moving contact 81, a B-phase moving contact 82 and a C-phase moving contact 83. The contactor further includes a normally closed auxiliary moving contact 9, a normally closed auxiliary static contact 10, a normally open auxiliary moving contact 11 and a normally open auxiliary static contact 12.

[0048] As shown in Figure 5As shown, the shell 1 is also provided with an A-phase outgoing line terminal hole 102, a B-phase outgoing line terminal hole 103, a C-phase outgoing line terminal hole 104, an N-phase outgoing line terminal hole 108 (neutral line), an A-phase incoming line terminal hole 105, a B-phase incoming line terminal hole 106, a C-phase incoming line terminal hole 107, an N-phase incoming line terminal hole 109, an electromagnetic coil 4 power supply A1 terminal hole 110, an electromagnetic coil 4 power supply A2 terminal hole 111, a normally open auxiliary contact terminal hole 112, a normally closed auxiliary contact terminal hole 113, an A-phase incoming line fastening bolt, a B-phase incoming line fastening bolt, a C-phase incoming line fastening bolt, an N-phase incoming line fastening bolt, an A-phase outgoing line fastening bolt, a B-phase outgoing line fastening bolt, a C-phase outgoing line fastening bolt, an N-phase outgoing line fastening bolt, an electromagnetic coil power supply A1 terminal fastening bolt, a normally closed auxiliary contact incoming line fastening bolt, a normally open auxiliary contact incoming line fastening bolt, a normally open auxiliary contact outgoing line fastening bolt, a normally closed auxiliary contact outgoing line fastening bolt, and an electromagnetic coil power supply A2 terminal fastening bolt.

[0049] As shown in the drawings, Figure 2 As shown, the bottom of the shell 1 is also provided with a fixed clamping seat 101, which is provided with a dovetail groove away from the side of the shell 1, for being installed in the electrical cabinet in cooperation with the mounting position in the electrical cabinet.

[0050] In the description herein, it should be understood that the terms "upper", "lower", "left", "right", and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", are only used to distinguish in the description, and have no special meaning.

[0051] In the description of the present specification, the description referring to the terms "an embodiment", "an example", and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0052] In addition, it should be understood that although the present specification is described in terms of embodiments, each embodiment does not necessarily contain only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

[0053] The technical principles of the present application are described above in combination with specific embodiments. These descriptions are only for explaining the principles of the present application, and cannot be interpreted as limiting the protection scope of the present application in any way. Based on the explanations herein, other specific embodiments of the present application can be conceived by those skilled in the art without any creative effort, and these embodiments will all fall within the protection scope of the present application.

Claims

1. A contactor structure, characterized in that, It includes a housing and a moving iron core, an electromagnetic coil, a neutral line stationary contact, a neutral line moving contact, a phase line stationary contact, and a phase line moving contact installed inside the housing; The neutral line moving contact and the phase line moving contact are fixedly installed on the moving iron core; The neutral line stationary contact and the neutral line moving contact are respectively disposed inside the housing, and the phase line stationary contact and the phase line moving contact are respectively disposed inside the housing. The end of the neutral line stationary contact near the neutral line moving contact and / or the end of the neutral line moving contact near the neutral line stationary contact is an elastically deformable structure, and the first distance between the neutral line stationary contact and the neutral line moving contact is less than the second distance between the phase line stationary contact and the phase line moving contact. The end of the neutral line stationary contact away from the neutral line moving contact is a rotatable structure, allowing the neutral line stationary contact to rotate around the end away from the neutral line moving contact. A spring is provided on the side of the neutral line stationary contact near the neutral line moving contact. One end of the spring is fixedly connected to the neutral line stationary contact, and the other end is fixedly connected to the housing. The electromagnetic coil is configured corresponding to the moving iron core and is used to generate a strong magnetic field when energized to drive the moving iron core to move, so that the neutral moving contact and the neutral stationary contact, and the phase moving contact and the phase stationary contact, come into contact and conduct.

2. The contactor structure according to claim 1, characterized in that, The neutral line stationary contact, the neutral line moving contact, the phase line stationary contact, and the phase line moving contact are all spring sheet structures, and they are elastically deformable.

3. The contactor structure according to claim 1, characterized in that, A rotating shaft is provided on the housing at the end of the neutral line stationary contact away from the neutral line moving contact, and the neutral line stationary contact is rotatably connected to the rotating shaft.

4. The contactor structure according to claim 1, characterized in that, When the spring is not compressed, the first distance between the stationary neutral contact and the moving neutral contact is less than the second distance.

5. The contactor structure according to claim 1, characterized in that, The phase line stationary contact includes phase A stationary contact, phase B stationary contact, and phase C stationary contact; the phase line moving contact includes phase A moving contact, phase B moving contact, and phase C moving contact.

6. The contactor structure according to claim 1, characterized in that, It also includes normally closed auxiliary moving contacts, normally closed auxiliary stationary contacts, normally open auxiliary moving contacts, and normally open auxiliary stationary contacts.

7. The contactor structure according to claim 1, characterized in that, It also includes a stationary iron core, which is disposed inside the electromagnetic coil to enhance the electromagnetic strength of the strong magnetic field generated by the electromagnetic coil.

8. The contactor structure according to claim 1, characterized in that, The bottom of the housing is also provided with a fixing bracket, and the fixing bracket has a dovetail groove on the side away from the housing.

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