Switching device of fuse for protecting voltage transformer
By using an insulating wire to connect the melt and trigger in the switching device of the fuse for voltage transformer protection, the problem of the melt cannot be alarmed after the melt is fuse of the small rated current, and a sensitive alarm for smaller current is achieved. Reduces costs and increases security.
Patent Information
- Application Number
- CN202421091371.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-17
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-05-17
AI Technical Summary
The high-voltage current limiting fuse used for voltage transformer protection is a small rated current, overload or short-circuit current, which makes it difficult for the Conco copper wire to fuse after the melt is fuse and cannot give an alarm signal.
A switching device for voltage transformer protection fuse is designed, and an insulating wire is connected to the melt and trigger. When the melt is working normally, the insulating wire is in a tension state, driving the spring to remain compressed, indicating that the slide rod is contracted. . When the overload or short-circuit current passes, the insulating line breaks after the melt is fused, and the spring extends, indicating that the slide rod extends, giving a fuse signal.
It improves the alarm accuracy and sensitivity of the fuse, can effectively give alarm signals under smaller current conditions, reduces production and maintenance costs, and improves safety through good insulation.
Smart Images
Figure CN222462812U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of fuses, and in particular to a switch device of a fuse for protecting a voltage transformer. Background Art
[0002] A fuse is an electrical component used to protect circuits. Its main function is to quickly blow and cut off the circuit when faults such as overload or short circuit occur in the circuit to prevent the fault from further expanding, thereby protecting the safety of electrical equipment and circuits.
[0003] In the related art, most specifications of fuses have an automatic alarm function, that is, when the fuse is running in the equipment, when an overload current or a short-circuit current passes through, the switch device of the fuse will often pop out and send a signal after the fuse melts, reminding the staff to check the equipment or replace the fuse or fuse in time. Its switch device generally uses a control method of a constantan wire and a fuse in parallel with a striker. Under normal circumstances, due to the large resistance of the constantan wire, the current basically flows through the fuse. When the fuse melts, the current flows through the constantan wire, causing it to melt quickly. At this time, the indicator immediately pops out under the action of the spring, and a striking red signal appears to remind the alarm.
[0004] However, in actual operation, the high-voltage current-limiting fuse used for voltage transformer protection has a small rated current (0.5-3A), so the overload current and short-circuit current in the equipment system are relatively small. When the fuse blows, the small overload current and short-circuit current are difficult to cause the constantan wire to melt, so no alarm signal can be given. Utility Model Content
[0005] In order to improve the alarm accuracy and sensitivity of a switching device of a fuse, the present application provides a switching device of a fuse for voltage transformer protection.
[0006] The present application provides a switch device for a voltage transformer protection fuse adopts the following technical solution:
[0007] A switch device for a fuse for voltage transformer protection, comprising a support column, a fuse, a conductor and an alarm mechanism;
[0008] The support column is coaxially hollow inside;
[0009] The melt is installed on the surface of the support column, and the wire is spirally wound on the surface of the support column and electrically connected to the melt;
[0010] The alarm mechanism includes an insulating wire and a triggering member. The triggering member is located at one end inside a support column. One end of the insulating wire passes through the support column and is connected to the fuse, while the other end is connected to the triggering member. When the fuse works normally, the insulating wire is in a tensioned state, and the triggering member is used to send a signal that the fuse has blown.
[0011] Preferably, the trigger member includes a spring and an indicator slide rod, a mounting hole is coaxially opened at one end of the support column, the spring is located in the mounting hole, the indicator slide rod and the spring are fixedly connected at one end facing outside the mounting hole, one end of the insulating wire is connected to the fuse, and the other end is connected to the spring. When the fuse works normally, the insulating wire drives the spring to maintain a compressed state, and the indicator slide rod is then retracted into the mounting hole.
[0012] Preferably, a slot is axially provided on the surface of the support column, the melt is installed in the slot, the bottom of the slot is connected to the interior of the support column, the end of the insulating wire facing away from the trigger member passes through the bottom of the slot and is connected to the melt, and a strip for sealing the slot is clamped in the slot.
[0013] Preferably, at least two card slots are provided.
[0014] Preferably, the outer coaxial cover of the support column is provided with a porcelain tube, the inner diameter of the porcelain tube is larger than the outer diameter of the support column, and the gap between the porcelain tube and the support column is filled with quartz sand.
[0015] Preferably, both ends of the porcelain tube are respectively clamped with inner clips, which seal the gap between the porcelain tube and the support column. The inner clip located on one side of the trigger member is provided with a sliding hole for the indicating slide rod to extend out, and the end of the wire facing away from the melt is welded to the inner clip.
[0016] Preferably, the inner clip outer sleeve is provided with an outer cap.
[0017] Preferably, a flat pad is provided between the outer cap and the inner clip.
[0018] The present application includes at least one of the following beneficial technical effects:
[0019] 1. The switch device of the present application connects one end of the insulating wire to the fuse and the other end to the spring of the trigger member. During normal operation, the insulating wire is in a tensioned state and drives the spring to be in a compressed state. At this time, the indicator slide bar is retracted inside the support column. When an overload current or a short-circuit current passes through the fuse, the fuse of the fuse will instantly blow due to excessive current. At this time, one end of the insulating wire is separated from the fuse, and then the spring stretches without the tension of the insulating wire. The indicator slide bar connected to it extends with the spring, giving a signal that the fuse is blown. The switch device of the present application also has good alarm accuracy for smaller currents. On the one hand, it improves the alarm accuracy and sensitivity of the switch device of the fuse. On the other hand, there is no need to additionally set up constantan wire, which effectively reduces the production and maintenance costs of the fuse.
[0020] 2. The present application can maintain good insulation of the switch device as a whole by providing quartz sand and porcelain tubes, thereby improving the safety of the switch device during use;
[0021] 3. The present application sets card slots and card strips. Setting multiple card slots facilitates the installation and maintenance of the fuse. Setting the card strips can seal the card slots, thereby preventing fillers from entering the card slots, thereby avoiding affecting the normal operation of the switch device. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is an overall cross-sectional view of a switch device of a voltage transformer protection fuse according to an embodiment of the present application;
[0023] Figure 2 It is a cross-sectional view of a support column of a switch device of a voltage transformer protection fuse according to an embodiment of the present application;
[0024] Figure 3 This is a schematic diagram of the connection structure of the fuse and the conductor of a switch device of a voltage transformer protection fuse according to an embodiment of the present application;
[0025] Figure 4 It is a schematic diagram of the overall external inductance of a switch device of a fuse for voltage transformer protection according to an embodiment of the present application.
[0026] Explanation of the reference numerals: 1. Support column; 11. Card slot; 12. Card strip; 13. Mounting hole; 14. Porcelain tube; 141. Quartz sand; 15. Inner clip; 151. Sliding hole; 16. Outer cap; 17. Flat pad; 2. Melt; 3. Wire; 31. Copper tube; 4. Alarm mechanism; 41. Insulated wire; 42. Spring; 43. Indicator slide bar. DETAILED DESCRIPTION
[0027] The following is combined with Figure 1-4 This application is described in further detail.
[0028] In the description of this application: unless otherwise specified, the meaning of "plurality" is two or more. The terms "first", "second", "third", etc. in this application are intended to distinguish the objects referred to, and do not have special meanings in terms of technical connotations (for example, they should not be understood as emphasizing the importance or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).
[0029] The terms such as "upper", "lower", "left", "right", "middle", etc. used in this application are usually used to facilitate intuitive understanding by comparing with the accompanying drawings, and are not absolute limitations on the positional relationship in the actual product. Without departing from the technical concept disclosed in this application, changes in these relative positional relationships should also be regarded as the scope of this application.
[0030] The embodiment of the present application discloses a switch device for a fuse used for voltage transformer protection. Figure 1 A switch device for a voltage transformer protection fuse includes a support column 1, a fuse 2, a conductor 3 and an alarm mechanism 4.
[0031] Reference Figure 1 and Figure 2 The support column 1 is a hollow tube, and at least two slots 11 are provided on the outer wall of the support column 1 along the axial direction, and the bottom of the slots 11 is connected to the inside of the support column 1. In this embodiment, there are two slots 11, and the two slots 11 are evenly spaced along the circumference of the support column 1. In this embodiment, the number of slots 11 can be three, four, etc., and the number is not a limitation of the present application. A strip 12 is provided in the slot 11, and the strip 12 is an elastic rubber strip.
[0032] Reference Figure 1 and Figure 3 There are two wires 3, and the two wires 3 are electrically connected to the two ends of the melt 2 by copper tubes 31. When connecting the wire 3 and the melt 2, take a piece of melt 2 of appropriate length, take two pieces of wire 3 of appropriate equal length, with the melt 2 in the middle and the wires 3 on both sides. The joint of the wire 3 and the melt 2 is passed through the copper tube 31, and then the copper tube 31 is flattened to complete the connection between the wire 3 and the melt 2.
[0033] Reference Figure 1 and Figure 3 The wire 3 and the copper tube 31 are both located in the clamping groove 11, the clamping strip 12 seals the clamping groove 11 and clamps the melt 2 and the copper tube 31 tightly, and the end of the wire 3 away from the melt 2 is spirally wound on the surface of the support column 1. The two clamping grooves 11 are provided to facilitate the installation and maintenance of the melt 2.
[0034] Reference Figure 1 and Figure 3 The alarm mechanism 4 includes an insulating wire 41 and a trigger, and the trigger includes a spring 42 and an indicating slide bar 43. A mounting hole 13 is coaxially opened at one end of the support column 1. The diameter of the mounting hole 13 is larger than the inner diameter of the support column 1. The spring 42 is located in the mounting hole 13. The telescopic axis of the spring 42 is consistent with the axial direction of the support column 1. The indicating slide bar 43 and the spring 42 are fixedly connected at one end facing the outside of the mounting hole 13. The insulating wire 41 is located in the support column 1. One end of the insulating wire 41 passes through the bottom of the card slot 11 and is fastened to the melt 2, and the other end is fixedly connected to the spring 42.
[0035] Reference Figure 1 and Figure 3 When the fuse 2 works normally, the insulating wire 41 drives the spring 42 to maintain a compressed state, and the indicating slide bar 43 is retracted in the mounting hole 13. When an overload current or a short-circuit current passes through the fuse, the fuse 2 of the fuse will be instantly blown due to the excessive current. At this time, one end of the insulating wire 41 is separated from the fuse 2, and then the spring 42 is extended without the tension of the insulating wire 41, and the indicating slide bar 43 connected to it is extended along with the spring 42, giving a signal that the fuse is blown.
[0036] Reference Figure 1 and Figure 4 A porcelain tube 14 is coaxially disposed outside the support column 1 . The inner diameter of the porcelain tube 14 is larger than the outer diameter of the support column 1 . The gap between the porcelain tube 14 and the support column 1 is filled with quartz sand 141 .
[0037] Reference Figure 1 and Figure 4 The two ends of the porcelain tube 14 are respectively clamped with inner clips 15, the longitudinal section of the inner clip 15 is U-shaped, the outer edge of the inner clip 15 is clamped on the outside of the porcelain tube 14, and the inner clip 15 is interference fit with the outer wall of the porcelain tube 14. The inner clip 15 is provided to maintain the connection stability between the support column 1 and the porcelain tube 14, and to prevent the quartz sand 141 from leaking out. The end of the wire 3 away from the melt 2 and the inner clip 15 are soldered.
[0038] Reference Figure 1 and Figure 4 The inner clip 15 is sleeved with an outer cap 16, and the outer cap 16 and the inner clip 15 are interference fit. The inner clip 15 and the outer cap 16 on the triggering member side are penetrated with a slide hole 151 for the indicating slide rod 43 to extend out. A flat pad 17 is arranged between the outer cap 16 and the inner clip 15, and the outer cap 16 is arranged so that the components of the switch device maintain good integrity.
[0039] The implementation principle of the switch device of a voltage transformer protection fuse in the embodiment of the present application is as follows: when the fuse 2 is working normally, the insulating wire 41 drives the spring 42 to maintain a compressed state, and the indicating slide bar 43 is retracted in the mounting hole 13. When an overload current or a short-circuit current passes through the fuse, the fuse 2 of the fuse will instantly melt due to the excessive current. At this time, one end of the insulating wire 41 is separated from the fuse 2, and then the spring 42 is extended without the tension of the insulating wire 41, and the indicating slide bar 43 connected thereto is extended along with the spring 42, giving a signal that the fuse is melted, so that it is convenient for maintenance personnel to replace the fuse or the fuse 2 in time. When the fuse 2 needs to be replaced, the outer cap 16 and the inner clip 15 are disassembled in turn, and then the clamping strip 12 is opened, and the fuse and the fuse 2 are taken out from the clamping slot 11 for replacement.
[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A switch device for a voltage transformer protection fuse, characterized in that: It comprises a support column (1), a melt (2), a wire (3) and an alarm mechanism (4); The support column (1) is coaxially hollow inside; The melt (2) is mounted on the surface of the support column (1), and the wire (3) is spirally wound on the surface of the support column (1) and is electrically connected to the melt (2); The alarm mechanism (4) comprises an insulating wire (41) and a triggering member, wherein the triggering member is located at one end inside the support column (1), one end of the insulating wire (41) passes through the support column (1) and is connected to the fuse (2), and the other end is connected to the triggering member. When the fuse (2) works normally, the insulating wire (41) is in a tensioned state, and the triggering member is used to send a signal that the fuse (2) is blown.
2. A switch device for a voltage transformer protection fuse according to claim 1, characterized in that: The trigger member comprises a spring (42) and an indicating slide bar (43); a mounting hole (13) is coaxially opened at one end of the support column (1); the spring (42) is located in the mounting hole (13); the indicating slide bar (43) and the spring (42) are fixedly connected at one end facing outside the mounting hole (13); one end of the insulating wire (41) is connected to the fuse (2) and the other end is connected to the spring (42); when the fuse (2) works normally, the insulating wire (41) drives the spring (42) to maintain a compressed state, and at this time the indicating slide bar (43) contracts in the mounting hole (13).
3. A switch device for a voltage transformer protection fuse according to claim 2, characterized in that: A slot (11) is provided on the surface of the support column (1) along the axial direction, the melt (2) is installed in the slot (11), the bottom of the slot (11) is connected to the inside of the support column (1), the end of the insulating wire (41) away from the trigger member passes through the bottom of the slot (11) and is connected to the melt (2), and a clip strip (12) for sealing the slot (11) is clipped in the slot (11).
4. A switch device for a voltage transformer protection fuse according to claim 3, characterized in that: At least two card slots (11) are provided.
5. The switch device of a voltage transformer protection fuse according to claim 1, characterized in that: The outer coaxial cover of the support column (1) is provided with a porcelain tube (14), the inner diameter of the porcelain tube (14) is greater than the outer diameter of the support column (1), and the gap between the porcelain tube (14) and the support column (1) is filled with quartz sand (141).
6. A switch device for a voltage transformer protection fuse according to claim 5, characterized in that: The two ends of the porcelain tube (14) are respectively clamped with inner clips (15), and the inner clips (15) seal the gap between the porcelain tube (14) and the support column (1). The inner clip (15) located on one side of the trigger member is provided with a sliding hole (151) for the indicating sliding rod (43) to extend out, and the end of the wire (3) facing away from the melt (2) is welded to the inner clip (15).
7. A switch device for a voltage transformer protection fuse according to claim 6, characterized in that: The inner clip (15) is provided with an outer cap (16) on its outer shell.
8. A switch device for a voltage transformer protection fuse according to claim 7, characterized in that: A flat pad (17) is provided between the outer cap (16) and the inner clip (15).