Double-break isolating switch

Abstract

The utility model provides a double-break isolating switch. The double-break disconnecting switch comprises a first static contact and a second static contact; a first moving contact and a second moving contact, wherein the first moving contact and the second moving contact are suitable for moving in opposite directions so as to be connected with or separated from the first static contact and the second static contact respectively; the driving mechanism comprises a lead screw, a first nut and a second nut, the lead screw comprises a first thread part section and a second thread part section which are connected with each other and are opposite in thread rotation direction, and the first nut and the second nut are matched with the first thread part section and the second thread part section respectively; the first moving contact and the second moving contact are respectively fixed to the first nut and the second nut. The lead screw can rotate to drive the first nut and the second nut to move in opposite directions along the axial direction of the lead screw, and then the first moving contact and the second moving contact are driven to move in opposite directions. The double-break isolating switch is simple in structure, and can easily realize synchronous reverse movement of the two moving contacts.

Description

Technical Field

[0001] This utility model relates generally to the field of disconnecting switch technology, and more specifically to a double-break disconnecting switch. Background Technology

[0002] Disconnecting switches are primarily used to reliably isolate energized sections of high-voltage facilities from energized sections, ensuring safety for tasks such as maintenance. Double-break disconnecting switches have two breaks connected in series, requiring both breaks to close or open simultaneously. Currently, the transmission mechanism controlling the closing or opening of the two breaks in double-break disconnecting switches is relatively complex, and its application in gas-insulated switchgear may lead to an unreasonable electric field distribution, affecting the insulation performance of the gas-insulated switchgear. Utility Model Content

[0003] The purpose of this invention is to solve the problems existing in the prior art and to propose an improved double-break disconnect switch.

[0004] To address this, the present invention provides a double-break disconnect switch, comprising: a first stationary contact and a second stationary contact; a first moving contact and a second moving contact, the first moving contact and the second moving contact being disposed between the first stationary contact and the second stationary contact and adapted to move in opposite directions to engage or disengage with the first stationary contact and the second stationary contact respectively; and a drive mechanism comprising a lead screw, a first nut and a second nut, the lead screw comprising a first threaded section and a second threaded section connected to each other, the threads of the first threaded section and the threads of the second threaded section having opposite directions of rotation, the first nut and the second nut respectively engaging with the first threaded section and the second threaded section; wherein, the first moving contact is fixed to the first nut, the second moving contact is fixed to the second nut, and the drive mechanism is configured such that: the lead screw can rotate to drive the first nut and the second nut to move in opposite directions along the axial direction of the lead screw, thereby driving the first moving contact and the second moving contact to move in opposite directions along the axial direction of the lead screw.

[0005] Based on the above technical concept, the present invention may further include any one or more of the following optional embodiments.

[0006] In some alternative embodiments, the drive mechanism includes a drive spindle, a first bevel gear driven by the drive spindle, and a second bevel gear that cooperates with the first bevel gear, the second bevel gear being coaxially fixed on the lead screw.

[0007] In some alternative embodiments, the lead screw includes a transition section, through which the first threaded section is connected to the second threaded section, wherein the second bevel gear is fixed on the transition section.

[0008] In some alternative embodiments, the lead screw is formed as a single piece, and / or the threads of the first threaded section and the threads of the second threaded section have the same pitch.

[0009] In some alternative embodiments, the double-break disconnector includes a contact seat with a hollow structure. The contact seat includes a first receiving chamber for receiving the first moving contact and the first nut, and a second receiving chamber for receiving the second moving contact and the second nut. The circumferential wall of the first receiving chamber is provided with a first guide portion for guiding the first moving contact to move along the axial direction of the lead screw, and the circumferential wall of the second receiving chamber is provided with a second guide portion for guiding the second moving contact to move along the axial direction of the lead screw.

[0010] In some alternative embodiments, the first moving contact is sleeved outside the first nut and connected to the first nut via a first connector, and the second moving contact is sleeved outside the second nut and connected to the second nut via a second connector. The first connector and the second connector are respectively provided with a first mating part and a second mating part, wherein the first mating part and the second mating part are adapted to engage with the first guide part and the second guide part respectively to guide the first moving contact and the second moving contact to move along the axial direction of the lead screw.

[0011] In some alternative embodiments, the first connector and the second connector are in the form of flanges, and / or the first guide portion and the second guide portion are in the form of grooves and the first mating portion and the second mating portion are in the form of protrusions.

[0012] In some alternative embodiments, the contact seat has a bearing inside, wherein the lead screw is rotatably supported by the bearing.

[0013] In some alternative embodiments, the free end of the first threaded section is provided with a first stop to prevent the first nut from falling off the first threaded section, and the free end of the second threaded section is provided with a second stop to prevent the second nut from falling off the second threaded section.

[0014] In some alternative embodiments, the double-break disconnector includes a housing filled with insulating gas, wherein the housing includes a cylindrical body and a first insulator and a second insulator respectively covering opposite ends of the cylindrical body, wherein the first moving contact and the second moving contact are disposed within the housing, and wherein the first stationary contact and the second stationary contact are respectively mounted on the first insulator and the second insulator within the housing.

[0015] The lead screw of the double-break disconnector according to this utility model has a first threaded section and a second threaded section with opposite thread directions. Simply by rotating the lead screw, the first nut, which engages with the first threaded section, and the second nut, which engages with the second threaded section, can be driven to move simultaneously in opposite directions. This, in turn, causes the first moving contact and the second moving contact to move simultaneously in opposite directions, thereby achieving simultaneous engagement or disengagement of the first moving contact with the first stationary contact and the second moving contact with the second stationary contact. This double-break disconnector has a simple structure and can easily achieve synchronous reverse movement of the first and second moving contacts, thus exhibiting good reliability and durability. Attached Figure Description

[0016] Other features and advantages of this utility model will be better understood through the following detailed description of optional embodiments in conjunction with the accompanying drawings, in which the same reference numerals identify the same or similar parts, wherein:

[0017] Figure 1 This is a cross-sectional view of a double-break disconnect switch according to an exemplary embodiment of the present invention, wherein the double-break disconnect switch is in the closed state;

[0018] Figure 2 This is a cross-sectional view of a double-break disconnect switch according to an exemplary embodiment of the present invention, wherein the double-break disconnect switch is in the open state;

[0019] Figure 3 yes Figure 2 A magnified view of region A in the image; and

[0020] Figure 4A and Figure 4B These are, respectively, a partial perspective view and a partial sectional view of the contact seat area of ​​a double-break disconnector according to an exemplary embodiment of the present invention. Detailed Implementation

[0021] The implementation and use of the embodiments are discussed in detail below. However, it should be understood that the specific embodiments discussed are merely illustrative of specific ways of implementing and using this utility model, and are not intended to limit the scope of this utility model. In the description, the structural positions of the various components, such as upper, lower, top, bottom, etc., are not absolute, but relative. These orientations are appropriate when the various components are arranged as shown in the figures, but these orientations change accordingly when the positions of the various components in the figures change.

[0022] In this utility model, the axial direction of the cylindrical or rod-shaped component refers to the direction of the central axis of the component, the circumferential direction of the cylindrical or rod-shaped component refers to the direction along the circumference of the component, and the radial direction of the cylindrical or rod-shaped component refers to the direction that passes through the central axis of the component and is perpendicular to the axial direction of the component.

[0023] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In this utility model, unless otherwise expressly specified, the terms "installed," "connected," "joined," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] Figures 1 to 4B A double-break disconnect switch 10 and its components according to an exemplary embodiment of the present invention are shown.

[0025] Reference Figure 1 and Figure 2The double-break disconnect switch 10 may include a first stationary contact 102 and a second stationary contact 104, a first moving contact 106 and a second moving contact 108, and a drive mechanism 110. The first moving contact 106 and the second moving contact 108 are disposed between the first stationary contact 102 and the second stationary contact 104 and are adapted to move in opposite directions to engage or disengage with the first stationary contact 102 and the second stationary contact 104, respectively. The drive mechanism 110 includes a lead screw 112, a first nut 114 and a second nut 116. The lead screw 112 includes a first threaded section 118 and a second threaded section 120 connected to each other. The threads of the first threaded section 118 and the second threaded section 120 have opposite directions of rotation. The first nut 114 and the second nut 116 respectively mate with the first threaded section 118 and the second threaded section 120. The first moving contact 106 is fixed to the first nut 114, the second moving contact 108 is fixed to the second nut 116, and the drive mechanism 110 is configured such that the lead screw 112 can rotate to drive the first nut 114 and the second nut 116 to move in opposite directions along the axial direction of the lead screw 112, thereby driving the first moving contact 106 and the second moving contact 108 to move in opposite directions along the axial direction of the lead screw 112.

[0026] The lead screw 112 of the aforementioned double-break disconnect switch 10 has a first threaded section 118 and a second threaded section 120 with opposite thread directions. Simply by rotating the lead screw 112, the first nut 114, which engages with the first threaded section 118, and the second nut 116, which engages with the second threaded section 120, can be driven to move in opposite directions. This, in turn, causes the first moving contact 106 and the second moving contact 108 to move in opposite directions, thereby enabling the engagement or disengagement of the first moving contact 106 with the first stationary contact 102, and the second moving contact 108 with the second stationary contact 104. This double-break disconnect switch 10 has a simple structure and can easily achieve synchronous reverse movement of the first moving contact 106 and the second moving contact 108, thus exhibiting good reliability and durability.

[0027] Reference Figure 1 and Figure 2The double-break disconnector 10 can be used in a gas-insulated switchgear (GIS). The double-break disconnector 10 may include a housing 122 filled with an insulating gas. The housing 122 includes a cylindrical body 124 and a first insulator 126 and a second insulator 128 covering opposite ends of the cylindrical body 124, respectively. In the illustrated embodiment, the first insulator 126 and the second insulator 128 are basin-type insulators. The first insulator 126 includes a first metal insert 130 for electrical connection at its center. The second insulator 128 includes a second metal insert 132 for electrical connection at its center. In the illustrated embodiment, the cylindrical body 124 also has a first opening 134 and a second opening 136 at its top and bottom, respectively. Accordingly, the housing 122 also includes a first cover plate 138 and a second cover plate 140 for covering the first opening 134 and the second opening 136, respectively. The cylindrical body 124, the first cover plate 138, and the second cover plate 140 may be made of metal. The first moving contact 106 and the second moving contact 108 are disposed within the housing 122. The first stationary contact 102 and the second stationary contact 104 are respectively installed within the housing 122 and electrically connected to the first metal insert 130 of the first insulator 126 and the second metal insert 132 of the second insulator 128.

[0028] The drive mechanism 110 of the double-break disconnect switch 10 may include a drive spindle 142, an insulating rod 144, a first bevel gear 146, and a second bevel gear 148. The drive spindle 142 may extend through a first cover plate 138 in a sealed manner and is connected to the insulating rod 144. The first bevel gear 146 is fixed to the end of the insulating rod 144, and the second bevel gear 148 is coaxially fixed to the lead screw 112 and engages / meets with the first bevel gear 146. The drive spindle 142 may be driven to rotate by a device outside the housing 122 to rotate the insulating rod 144 and the first bevel gear 146, and then, through the engagement of the first bevel gear 146 and the second bevel gear 148, to rotate the second bevel gear 148 and the lead screw 112. In the illustrated embodiment, the lead screw 112 is formed as a single piece. The lead screw 112 includes a transition section 150, through which a first threaded section 118 is connected to a second threaded section 120. The second bevel gear 148 is fixed on the transition section 150. The first threaded section 118 may have a left-hand thread and the second threaded section 120 may have a right-hand thread, or the first threaded section 118 may have a right-hand thread and the second threaded section 120 may have a left-hand thread.

[0029] In the illustrated embodiment, the first stationary contact 102, the second stationary contact 104, the first moving contact 106, and the second moving contact 108 are all cylindrical in shape and have a central axis collinear with the axis of the lead screw 112. The first stationary contact 102 and the second stationary contact 104 are symmetrically arranged, and the first moving contact 106 and the second moving contact 108 are also symmetrically arranged. This coaxial and symmetrical arrangement of the two pairs of contacts will form a coaxial electric field inside the housing 122, resulting in a more uniform electric field distribution and a relatively smaller electric field strength, which is beneficial to improving the insulation performance inside the double-break disconnect switch 10.

[0030] The first moving contact 106 and the first stationary contact 102 form a first break. The second moving contact 108 and the second stationary contact 104 form a second break. The first and second breaks are connected in series, which will be more easily understood in conjunction with the following text. A first spring contact 152 and a second spring contact 154 are also respectively provided at the first stationary contact 102 and the second stationary contact 104 to ensure good electrical connection between the first stationary contact 102 and the first moving contact 106, and between the second stationary contact 104 and the second moving contact 108, when the first and second breaks are closed.

[0031] Reference Figures 1 to 4B The double-break disconnector 10 includes an insulating support 156 and a contact seat 158. The insulating support 156 is disposed on the second cover plate 140 and supports the contact seat 158. The contact seat 158 ​​may be made of metal. The contact seat 158 ​​includes a first receiving chamber 160 for receiving a first moving contact 106 and a first nut 114, and a second receiving chamber 162 for receiving a second moving contact 108 and a second nut 116.

[0032] In the illustrated embodiment, the contact seat 158 ​​has a hollow structure and a bearing 172 is disposed therein. The lead screw 112 is rotatably supported within the contact seat 158 ​​by the bearing 172. A first threaded section 118 of the lead screw 112 extends into a first receiving chamber 160 to engage with a first nut 114. A second threaded section 120 of the lead screw 112 extends into a second receiving chamber 162 to engage with a second nut 116.

[0033] The first receiving chamber 160 and the second receiving chamber 162 are generally cylindrical in shape. The first moving contact 106 is slidable along the circumferential wall of the first receiving chamber 160 and maintains good electrical connection with the circumferential wall of the first receiving chamber 160 via a third spring contact 164. The second moving contact 108 is slidable along the circumferential wall of the second receiving chamber 162 and maintains good electrical connection with the circumferential wall of the second receiving chamber 162 via a fourth spring contact 166. Thus, the first moving contact 106 and the second moving contact 108 can be electrically connected to each other via a contact seat 158, thereby connecting the first break and the second break in series via the contact seat 158.

[0034] In the illustrated embodiment, the first moving contact 106 is sleeved on the outside of the first nut 114 and connected to the first nut 114 via the first connector 174. The second moving contact 108 is sleeved on the outside of the second nut 116 and connected to the second nut 116 via the second connector 176. In the illustrated embodiment, the first connector 174 and the second connector 176 may be in the form of an annular member / flange. It is conceivable that in other embodiments not shown, the first moving contact may be directly connected to the first nut, and the second moving contact may be directly connected to the second nut, without the need for the first and second connectors.

[0035] In the illustrated embodiment, the circumferential wall of the first receiving chamber 160 is provided with a first guide portion 178 for guiding the first moving contact 106 to move along the axial direction of the lead screw 112, and the circumferential wall of the second receiving chamber 162 is provided with a second guide portion 180 for guiding the second moving contact 108 to move along the axial direction of the lead screw 112, thereby preventing the first moving contact 106, the first nut 114, the second moving contact 108, and the second nut 116 from rotating about the axis of the lead screw 112. Correspondingly, the first connecting member 174 and the second connecting member 176 are respectively provided with a first mating portion 182 and a second mating portion 184. The first mating portion 182 and the second mating portion 184 are adapted to engage with the first guide portion 178 and the second guide portion 180 respectively to guide the first moving contact 106 and the second moving contact 108 to move along the axial direction of the lead screw 112. In the illustrated embodiment, the first guide portion 178 and the second guide portion 180 are in the form of grooves extending in the axial direction parallel to the lead screw 112, and the first mating portion 182 and the second mating portion 184 are in the form of protrusions. The first mating portion 182 and the second mating portion 184 are respectively parts of bolts screwed onto the first connector 174 and the second connector 176.

[0036] It is conceivable that, in some embodiments not shown, the first mating portion can be integrally formed with the first connecting member, and the second mating portion can be integrally formed with the second connecting member. It is also conceivable that, in some embodiments not shown, a first mating portion cooperating with the first guide portion can be provided on the first moving contact, and a second mating portion cooperating with the second guide portion can be provided on the second moving contact; in some embodiments not shown, for example, where the first and second mating portions are respectively provided on the first and second moving contacts, the first and second guide portions can be in the form of protrusions, and the first and second mating portions can be in the form of grooves.

[0037] The threads of the first threaded section 118 and the second threaded section 120 of the lead screw 112 can have the same pitch, so that when the lead screw rotates, the first nut 114 and the second nut 116 can move synchronously in opposite directions at the same speed along the axis of the lead screw 112. This facilitates the simultaneous engagement and disengagement of the first moving contact 106 and the first stationary contact 102, and the second moving contact 108 and the second stationary contact 104. In other words, it enables the simultaneous closing and opening of the first and second breaks. When the first nut 114 and the second nut 116 move away from each other in opposite directions and are in position, the first moving contact 106 and the second moving contact 108 can simultaneously engage the first stationary contact 102 and the second stationary contact 104, respectively, so that the first and second breaks are in the closed state. In other words, the double-break disconnect switch 10 is in the closed state. Figure 1 The diagram shows the closed state. When the first nut 114 and the second nut 116 move closer to each other in opposite directions and into position, the first moving contact 106 and the second moving contact 108 can simultaneously separate from the first stationary contact 102 and the second stationary contact 104, respectively, so that the first and second breaks are in the open state. In other words, the double-break disconnector 10 is in the closed state. Figure 2 The shown is the on / off state.

[0038] In the illustrated embodiment, the free end of the first threaded section 118 may be provided with a first stop 186 to prevent the first nut 114 from accidentally falling off the first threaded section 118, and the free end of the second threaded section 120 may be provided with a second stop 188 to prevent the second nut 116 from accidentally falling off the second threaded section 120. The first stop 186 and the second stop 188 may be in the form of tabs.

[0039] It should be understood that the various components and features described herein may be made of a variety of materials, including but not limited to polymers, rubber, metals, and other suitable materials or combinations thereof known to those skilled in the art. Figures 1 to 4BThe embodiments shown only illustrate the shape, quantity, size and arrangement of the various optional components of the double-break disconnect switch according to the present invention. However, they are only illustrative and not limiting. Other shapes, sizes and arrangements may be adopted without departing from the spirit and scope of the present invention.

[0040] The technical content and features of this utility model have been disclosed above. However, it is understood that, under the inventive concept of this utility model, those skilled in the art can easily make modifications, variations, and equivalents of these embodiments based on the disclosed content. For example, features shown or described as part of one embodiment can be used with another embodiment to produce yet another embodiment. This disclosure is intended to cover these modifications, variations, and equivalents. The description of the above embodiments is exemplary and not restrictive, and the scope of protection of this utility model is determined by the claims.

Claims

1. A double-break disconnector, characterized in that The double-break disconnector (10) comprises: a first static contact (102) and a second static contact (104); a first moving contact (106) and a second moving contact (108), the first moving contact (106) and the second moving contact (108) being arranged between the first static contact (102) and the second static contact (104) and being adapted to move in opposite directions to engage or disengage the first static contact (102) and the second static contact (104), respectively; a drive mechanism (110) comprising a lead screw (112), a first nut (114) and a second nut (116), the lead screw (112) comprising a first threaded section (118) and a second threaded section (120) connected to each other, the threads of the first threaded section (118) and the threads of the second threaded section (120) being of opposite hand, the first nut (114) and the second nut (116) cooperating with the first threaded section (118) and the second threaded section (120), respectively; wherein the first moving contact (106) is fixed to the first nut (114), the second moving contact (108) is fixed to the second nut (116), and the drive mechanism (110) is configured such that the lead screw (112) can be rotated to move the first nut (114) and the second nut (116) in opposite directions along the axial direction of the lead screw (112), thereby moving the first moving contact (106) and the second moving contact (108) in opposite directions along the axial direction of the lead screw (112).

2. Double-break disconnector according to claim 1, characterized in that The drive mechanism (110) comprises a drive spindle (142), a first bevel gear (146) driven by the drive spindle (142), and a second bevel gear (148) cooperating with the first bevel gear (146), the second bevel gear (148) being fixed coaxially on the lead screw (112).

3. Double-break disconnector according to claim 2, characterized in that The lead screw (112) comprises a transition section (150) through which the first threaded section (118) is connected to the second threaded section (120), wherein the second bevel gear (148) is fixed on the transition section (150).

4. The double-break disconnector according to claim 1, characterized in that The lead screw (112) is formed as a one-piece part, and / or the threads of the first threaded section (118) and the threads of the second threaded section (120) have the same pitch.

5. Double-break disconnector according to any of claims 1 to 4, characterized in that The double-break disconnector (10) comprises a contact holder (158) having a hollow construction, the contact holder (158) comprising a first receiving chamber (160) for receiving the first moving contact (106) and the first nut (114) and a second receiving chamber (162) for receiving the second moving contact (108) and the second nut (116), wherein a circumferential wall of the first receiving chamber (160) is provided with a first guide (178) for guiding the first moving contact (106) in an axial direction of the screw (112) and a circumferential wall of the second receiving chamber (162) is provided with a second guide (180) for guiding the second moving contact (108) in an axial direction of the screw (112).

6. Double-break disconnector according to claim 5, characterized in that The first moving contact (106) is sleeved outside the first nut (114) and connected to the first nut (114) via a first connecting piece (174), and the second moving contact (108) is sleeved outside the second nut (116) and connected to the second nut (116) via a second connecting piece (176), wherein the first connecting piece (174) and the second connecting piece (176) are respectively provided with a first matching part (182) and a second matching part (184), wherein the first matching part (182) and the second matching part (184) are adapted to engage with the first guide (178) and the second guide (180), respectively, to guide the first moving contact (106) and the second moving contact (108), respectively, to move in an axial direction of the screw (112).

7. Double-break disconnector according to claim 6, characterized in that The first connecting piece (174) and the second connecting piece (176) are in the form of flanges, and / or The first guide (178) and the second guide (180) are in the form of grooves and the first matching part (182) and the second matching part (184) are in the form of protrusions.

8. The double-break disconnector according to claim 5, characterized in that The contact holder (158) is provided with a bearing (172) inside, wherein the screw (112) is rotatably supported by the bearing (172).

9. Double-break disconnector switch according to any of claims 1 to 4, characterized in that A free end of the first threaded section (118) is provided with a first stopper (186) to prevent the first nut (114) from falling off the first threaded section (118), and a free end of the second threaded section (120) is provided with a second stopper (188) to prevent the second nut (116) from falling off the second threaded section (120).

10. Double-break disconnector switch according to any of claims 1 to 4, characterized in that The double-break disconnector (10) comprises a housing (122) filled with an insulating gas, wherein the housing (122) comprises a cylindrical body (124) and a first insulator (126) and a second insulator (128) covering opposite ends of the cylindrical body (124), respectively, wherein the first moving contact (106) and the second moving contact (108) are arranged within the housing (122), and wherein the first stationary contact (102) and the second stationary contact (104) are mounted on the first insulator (126) and the second insulator (128), respectively, within the housing (122).

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