An auxiliary fuse

Abstract

A novel auxiliary fuse comprises a shell, a fuse guide post, a spring, a micro switch, an indicator particle, a connector, a base, an auxiliary fuse, and a gasket. The auxiliary fuse of the auxiliary fuse does not need to be installed in the fuse tube body, and the mounting bracket (connector) does not need to be designed with different lengths according to the different lengths of the fuse tube. During installation and use, the mounting bracket (connector) can be adjusted to adapt to different length requirements by adjusting the connection length, thereby meeting the requirement of one specification and multiple lengths. In addition, an auxiliary contact is provided on the tube body of the micro switch. After the contact is connected to the background system, the working status of the fuse can be remotely observed and monitored. For a fuse in use, if it needs to be changed to have an auxiliary fuse, this device can be directly installed on the tube body, which greatly facilitates upgrades and modifications, reduces replacement and upgrade costs, and improves the reliability of observing and monitoring the working status of the fuse.

Description

Technical Field

[0001] The present invention relates to the field of electrical equipment protection, in particular to a fuse used for protecting electrical circuits and electrical equipment. Background Art

[0002] A fuse is an electrical device that generates heat to melt its fuse element, disconnecting the circuit when the current exceeds a specified value. When in use, the fuse is connected in series with the circuit being protected. When an overload or short-circuit current flows through the fuse element, it heats up and melts, thus providing protection for power systems, various electrical equipment, and household appliances. To facilitate observation and judgment of the fuse's operating status, particularly whether the fuse has blown due to a circuit overload or short circuit, an auxiliary fuse is typically installed on the fuse's outer tube. This can be determined by checking whether the indicator light on the auxiliary fuse is off or the indicator bulb is popped up.

[0003] The auxiliary fuses currently available on the market are also called micro switches in the industry. The fuses used to install micro switches must be pre-set with one to three mounting springs and auxiliary fuses connected to the micro switch (mostly made of constantan wire) on the fuse body when the fuse is manufactured, and the holes for the springs must be tightened (ceramic fuses are set during firing, and epoxy fuses are drilled on the tube body). During production and installation, first tie an auxiliary fuse to the spring to be installed in the middle hole of the fuse, then insert the auxiliary fuse into the tube through the hole, and then press the spring into the fuse body. Insert the auxiliary fuse link into the hole, tighten the auxiliary fuse link along the length of the tube, and fully embed the spring into the tube. Next, wrap the auxiliary fuse link around the contacts at both ends of the fuse tube (or pull it out from the holes on both sides of the center hole of the tube and wrap it around the auxiliary fuse mounting bracket), ensuring the spring surface is parallel to the tube. Next, install the microswitch on the fuse tube, aligning the indicator or indicator light contact with the spring. The indicator or indicator light contact is fully in contact with the spring and pressed firmly against the spring. This completes the production of the fuse with a microswitch. When the high current or high voltage generated by a short circuit or overload causes the fuse link to melt, the auxiliary fuse link on the microswitch also melts due to the overload current or voltage. The spring embedded in the tube hole loses its tension and springs up, hitting the indicator on the microswitch, causing it to bounce up, or the indicator light to go out due to power failure, thus reporting or indicating that the fuse has blown.

[0004] However, current fuses with auxiliary fuses have several drawbacks. First, during production, a hole for inserting a spring must be reserved in the fuse tube. The spring, already attached to the auxiliary fuse, is inserted into the hole. The auxiliary fuse is then inserted into the hole and into the tube body. The spring is pressed into the hole, and both sides of the auxiliary fuse are tightened so that the spring is completely embedded in the tube body. The auxiliary fuse is then wrapped around the contacts at both ends of the fuse tube (or contact bolts). Only then can a fuse with micro-movement be produced. If this is done, the fuse tube becomes, to a certain extent, a dedicated fuse tube with micro-movement (auxiliary). When auxiliary fuses are not required for production, one solution is to fire / purchase a batch of fuse tubes without the hole (which is then scrapped). Another workaround is to plug the hole with sealing material. Either method increases production costs. Firing the fuse tube requires a separate mold, and plugging the hole requires additional materials and processes. Furthermore, technical indicators such as density, crack resistance, and impact resistance are reduced. Second, if existing installed fuses are to be replaced with fuses with auxiliary functions, all fuses will need to be replaced, significantly increasing costs and wasting resources. Third, the auxiliary fuse (micro switch) mounting plate needs to be set to different sizes according to different voltages or fuse tube lengths, and installed and used one by one. As a result, auxiliary fuse accessory manufacturers need to design multiple molds of different dimensions to produce auxiliary fuses, and fuse manufacturers need to purchase and stockpile auxiliary fuses of various specifications to meet production needs, which increases production costs, increases resource investment, and also increases management costs. Summary of the Invention

[0005] In order to solve the above shortcomings, the purpose of the present invention is to provide an auxiliary fuse to replace the auxiliary fuses currently commonly used in the market. The new auxiliary fuse designed and provided by the present invention can be used in the current manner on a fuse tube with a micro switch spring mounting hole reserved to digest the existing inventory and avoid waste. It can also be installed and used on a fuse tube body of a fuse without a reserved spring mounting hole. Moreover, the mounting bracket (connector) does not need to be designed to different lengths according to the different lengths of the fuse tube or the different lengths of the fuse links used for different voltage designs. It only needs to be designed and manufactured to the most commonly used (or shortest) length size. Then, during installation and use, the connection length of the mounting bracket (connector) can be adjusted according to the different voltages of the fuse or the different tube lengths. It can adapt to different length requirements and achieve one specification, which is suitable for the installation and use of fuses of various specifications; and on this basis, an auxiliary contact is set on the tube body of the micro switch, which can be connected to the background control system with a wire. When the fuse blows, the background system can detect and deal with it in time, thereby reducing the duration of the system fault; in addition, this new auxiliary fuse can be installed and used for both newly manufactured fuses and fuses that are already in use. It not only provides great convenience to production enterprises and helps reduce inventory and capital occupation, but also provides great convenience for the upgrade and transformation of electrical lines and electrical equipment that have been installed without auxiliary fuses, reduces replacement and upgrade costs, and improves the observation and monitoring reliability of the working status of the fuse.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] 1. An auxiliary fuse, comprising a housing, a fuse guide post, a spring, a micro switch, a micro switch auxiliary contact, an indicator particle, a fastening nut, a nut, a connector, a connector fastening bolt, a base, an auxiliary fuse, a washer, and a base fastening bolt. The spring is placed into a recessed portion of the housing surface, and the auxiliary fuse is then passed through a hole reserved in the housing and through the spring to tighten it. The auxiliary fuse is then placed on the auxiliary fuse guide post in the housing cavity, with both ends connected and fixed to the connector fastening bolts.

[0008] The indicator particle is fixed above the spring on the sunken platform on the surface of the shell (so that it has a rebound effect when the fuse is blown), and is fixed inside by a fastening nut; the base is installed into the bottom of the shell (fixed by bolts), the upper end of the connecting piece is fixed to the surface of the shell by bolts, and the other end is fixed to the fuse;

[0009] The characteristic is that the auxiliary fuse is arranged and installed in the auxiliary fuse and does not need to be installed in the fuse tube.

[0010] 2. The auxiliary fuse guide pin in the inner cavity of the shell is provided with multiple turns of fuse guide grooves and an auxiliary fuse extension guide pin to facilitate the winding and arrangement of the auxiliary fuse.

[0011] 3. The auxiliary fuse wound in the inner cavity of the housing can be set to different lengths as needed to meet different model and specification requirements.

[0012] 4. The connecting piece can be set to different lengths according to the different external dimensions of the melting tube, and the connecting hole with the shell includes a circular hole and a waist-shaped hole to facilitate fine-tuning; and the connecting hole includes two types: with thread and without thread.

[0013] 5. The fastening nuts installed in the housing include embedded type and external type to meet different installation requirements.

[0014] 6. The micro switch is provided with auxiliary contacts, which can be connected to the equipment / line background control system with wires, so as to facilitate observation of the working status of the fuse and timely detection and handling of system faults.

[0015] 7. The auxiliary fuse is made of metal material.

[0016] 8. The gasket is made of high temperature resistant elastic material.

[0017] The present invention provides a new auxiliary fuse that does not require the auxiliary fuse to be installed in the fuse tube body, and is used to replace the auxiliary fuse commonly used in the market. The invention is convenient to manufacture, has a reduced number of steps, is simple to operate, and is easy to replace. Moreover, the mounting bracket (connector) does not need to be designed with different lengths according to different lengths of the fuse tube or different lengths of fuse links used for different voltage designs. Only one most commonly used (or shortest) length size needs to be designed and manufactured. Then, during installation and use, the connection length of the mounting bracket (connector) can be adjusted according to different voltages or fuse tube lengths to adapt to different length requirements and meet the installation and use requirements of fuses of various specifications. On this basis, a micro-connector is also provided. An auxiliary contact is set on the tube body of the dynamic switch. When this auxiliary contact is connected to the line / equipment background control system with a wire, it can be remotely observed and monitored. When the fuse blows, it can be discovered and handled quickly in time, reducing the duration of the system fault. In particular, this new auxiliary fuse is suitable for fuses that have been installed in electrical lines and electrical equipment and are in use. If they need to be upgraded and replaced with fuses with microswitch indication, this device can be directly installed on the tube body. This greatly facilitates the upgrade and transformation of electrical lines and electrical equipment that have been installed without auxiliary fuses, reduces replacement and upgrade costs, and improves the reliability of observing and monitoring the working status of the fuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 An exploded view of the components of an embodiment of the present invention.

[0019] Figure 2 Schematic diagram of the inner structure of the shell according to an embodiment of the present invention.

[0020] Figure 3 Schematic diagram of the installation assembly structure of an embodiment of the present invention.

[0021] Figure 4 Schematic diagram of the internal structure of the present invention.

[0022] Figure 5 This is a schematic diagram of the external structure of the micro switch implemented in the present invention.

[0023] Explanation of the accompanying reference numerals: 1. Housing, 2. Auxiliary fuse guide post, 3. Spring, 4. Micro switch, 5. Auxiliary contact of micro switch, 6. Indicator particle, 7. Fastening nut, 8. Nut, 9. Connecting plate, 10. Base, 11. Auxiliary fuse, 12. Washer, 13. Base fastening bolt, 14. Auxiliary fuse fixing bolt, 15. Micro switch fixing bolt, 16. Connecting plate fixing bolt, 17. Auxiliary fuse extension guide post, 18. Micro switch conductive plate bolt, 19. Fuse, 20. Micro switch conductive plate slider, 21. Micro switch fixing bolt through hole. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] Embodiment, an auxiliary fuse, such as Figures 1 to 5 As shown, it includes: housing 1, auxiliary fuse guide 2, spring 3, micro switch 4, micro switch auxiliary contact 5, indicator particle 6, fastening nut 7, nut 8, connecting plate 9, base 10, auxiliary fuse 11, washer 12, base fastening bolt 13, auxiliary fuse fixing bolt 14, micro switch fixing bolt 15, connecting plate fixing bolt 16, auxiliary fuse extension guide 17, micro switch conductive plate bolt 18, fuse 19, micro switch conductive plate slider 20 and micro switch fixing bolt through hole 21. In this embodiment, as shown in FIG. Figures 1 to 5 As shown, first place the spring into the sink of the housing 1 (in this embodiment, it is arranged in a U shape). Then, insert the auxiliary fuse 11 through the reserved through-hole (not marked in the figure) in the middle of the sink of the housing 1 and then through the spring 3. Then, the auxiliary fuse 11 is arranged in the inner cavity of the housing 1 through the auxiliary fuse guide 2 provided in the inner cavity of the housing. After tightening the spring 3 to fully engage the auxiliary fuse, the two ends of the auxiliary fuse 11 are wrapped around the auxiliary fuse fixing bolts 14 and fixed. Then, the auxiliary fuse fixing bolts 14 are tightened into the fastening nuts 7.

[0026] Next, place the washer 12 into the guide groove of the base 10, buckle the base 10 to the bottom of the housing 1, and then pass the base fastening bolts 13 through the reserved holes in the base (not marked in the figure) and tighten them to the auxiliary fuse guide post (the guide post has a nut embedded in it, not marked in the figure).

[0027] After completing the above steps, place the indicator particle 6 on the upper part of the spring 3 at the sinking platform of the shell 1, and then insert the micro switch 4 at the sinking platform position of the shell 1. When inserting, be careful to ensure that the micro switch point slider 20 is just above the indicator particle 6 and is in full contact. Then pass the fixing bolt 15 through the micro switch fixing bolt through-hole 21, put the nut 8 on the other end, and tighten it to fix the micro switch 4 above the sinking platform of the shell 1.

[0028] During installation and use, the upper end of the connecting plate 9 (the end connected to the auxiliary fuse) can be inserted into the fastening nut 7 using the connecting plate fixing bolt 16 to connect and fix it to the housing 1, and the other end can be connected and fixed to the contact (or outer cover) of the fuse 19. This completes the installation of the auxiliary fuse of the present invention.

[0029] When installing and using on electrical lines or electrical equipment, first install the fuse 19 in the base of the power distribution facility (if it is a bolt connection method, fix it to the line busbar with bolts), then connect the wire to the auxiliary contact 5 of the micro switch, and connect the other end of the wire to the background control system (a red and green indicator light can be used to display the working status of the fuse 19). After the fuse 19 is energized and enters the working state, since the microswitch 4 is provided with a conductive circuit (not shown in the figure) inside and is fixed with the microswitch conductive plate bolt 18, during normal power-on, the conductive circuit is connected to the first contact and the green indicator light is on. When the fuse 19 is blown due to overload or short circuit, the auxiliary fuse body 11 arranged on the auxiliary fuse also melts due to the current or voltage exceeding the load. At this time, the spring 3 bounces up, lifting the indicator particle 6, and the indicator particle jointly lifts the microswitch conductive plate slider 20. The microswitch conductive plate slider 20 pushes up, lifting the conductive plate (elastic copper sheet) on the conductive circuit inside the microswitch 4, so that it is connected to the second contact. At this time, the red indicator light of the background control system lights up, indicating that the line (or equipment) where the fuse is located has a fault, and the staff can discover and handle it in time.

[0030] The most notable feature of the present invention is that the fuse element used in the auxiliary fuse does not need to be installed in the fuse tube, but is directly installed in the auxiliary fuse shell, which saves labor, reduces manufacturing costs, and can be replaced at will.

[0031] Another notable feature of the present invention is that the auxiliary fuse 11 arranged on the auxiliary fuse can be set to different lengths according to the different voltage and current requirements of the fuse. To meet different length requirements, the auxiliary fuse guide post 2 provided in the inner cavity of the housing 1 is provided with multiple fuse guide grooves along the height direction, so that the auxiliary fuse 11 can be arranged by winding multiple times along the height direction. On this basis, an auxiliary fuse extension guide post 17 is also provided, and the auxiliary fuse 11 can be extended and lengthened through the auxiliary fuse extension guide groove 17.

[0032] Another notable feature of the present invention is that the external dimensions of the auxiliary fuse are fixed. The auxiliary fuse guide post 2 and the auxiliary fuse extension guide post 17 are provided inside the housing 1 to achieve different length (resistance) requirements for the fuse 11 for different currents and voltages. On the outside, the different lengths of the connecting plate 9 and the waist-shaped holes are provided to meet the requirements for installation on fuse tubes of different lengths, thereby achieving multi-purpose use, saving costs, and facilitating replacement.

[0033] Because the solution provided by the present invention is to install and arrange the auxiliary fuse in the inner cavity of the auxiliary fuse shell rather than in the fuse tube, when a fuse installed in series on a line or equipment blows, the auxiliary fuse can be removed, the base opened, and a specified length of auxiliary fuse reinstalled as required to complete the repair and then installed on the fuse for use again. The operation is simple and fast. This reusable feature has a good promoting effect on saving resources, reducing waste, lowering costs, and improving work efficiency.

[0034] In large-scale power supply systems, or systems with multiple electrical devices and multiple lines, there are typically multiple sets of power control equipment, and the number of installed fuses can be numerous, even hundreds or even thousands. Without auxiliary fuses, when a line or device fails, workers / maintenance personnel must investigate each one individually, which is not only labor-intensive but also time-consuming, hindering timely troubleshooting and significantly impacting production and daily life, and can even lead to major safety incidents and significant economic losses. However, if the new auxiliary fuses designed in the present invention were installed on all fuses in use in existing power supply systems, the power supply system could be significantly upgraded with minimal investment, minimal workload, and reduced replacement time. This significantly facilitates observing and monitoring the operating status of the power supply system, promptly troubleshooting faults, and restoring power after a fault occurs. This upgrade method, which does not require replacing existing fuses, is particularly suitable for large-scale power supply systems and large-scale industries such as chemical, energy, machinery, transportation, and water conservancy, providing a low-cost and rapid upgrade method.

[0035] Auxiliary fuses currently used in the industry have a major flaw that has plagued many manufacturers and users. This defect is that when a line or electrical equipment causes a fuse to blow due to a short circuit or overload, the spring embedded in the fuse tube does not spring in, failing to provide an alarm or prompt. This causes the system to misjudge the situation, increasing the difficulty of troubleshooting and prolonging the fault duration. This defect is caused by two factors: one is that the spring is stuck (locked), and the other is that the auxiliary fuse does not melt simultaneously in the fuse tube due to the density of the arc-extinguishing filler, or the spring tension is insufficient after the fuse blows, causing the spring to remain taut, resulting in the spring not rebounding and the indicator bead installed on the auxiliary fuse (micro switch) not being lifted by the spring. This defect is particularly significant in high-current, high-break fuses that have undergone curing treatment, because the fuses that require curing treatment need to inject curing liquid into the arc-extinguishing filler. After the arc-extinguishing filler solidifies (generally at high temperature), the fuse embedded in the arc-extinguishing filler in the breaker tube and the auxiliary fuse connected to the spring are cured in the arc-extinguishing filler. After the fuse blows under overload or short-circuit current impact, if the arc-extinguishing filler at the position of the fuse spring is not broken or cracked due to the arc impact, the auxiliary fuse will not lose the pulling force on the spring, and the spring will not rebound; there is also a phenomenon that when the curing liquid is injected into the fuse tube, some curing liquid penetrates into the spring, so that during the high-temperature curing process of the arc-extinguishing filler in the fuse tube, the spring is also cured, and the spring loses its elastic force.

[0036] The new auxiliary fuse provided by the present invention avoids the possibility of such defects because the auxiliary fuse is not installed in the fuse tube body but installed outside the fuse. This greatly improves the accuracy of judging the working status of the fuse and promptly handling line or equipment faults, thereby reducing misjudgments and erroneous judgments.

[0037] In summary, the present invention provides a new auxiliary fuse that does not require the fuse to be installed in the fuse tube body, and is used to replace the auxiliary fuse commonly used in the market. It is easy to manufacture, has a reduced number of steps, is simple to operate, and is easy to replace. Moreover, the mounting bracket (connector) does not need to be designed with different lengths according to the different lengths of the fuse tube or the different lengths of the fuse links used for different voltage designs. Only one most commonly used (or shortest) length size needs to be designed and manufactured. Then, during installation and use, the connection length of the mounting bracket (connector) can be adjusted according to the different voltages of the fuse or the different tube lengths to adapt to different length requirements, so that a single specification can be used to install and use fuses of various specifications. In addition, an auxiliary contact is set on the tube body of the microswitch. When this auxiliary contact is connected to the line / equipment background control system with a wire, it can be remotely observed and monitored. When the fuse blows, it can be discovered and handled quickly in time, reducing the duration of the system fault. In particular, this new auxiliary fuse is for fuses that have been installed in electrical lines and electrical equipment and are in use. If it needs to be upgraded and replaced with a microswitch indicating fuse, it is only necessary to install the device directly on the tube body. This provides great convenience for the upgrade and transformation of electrical lines and electrical equipment that have been installed without auxiliary fuses, reduces the replacement and upgrade costs, and improves the reliability of observation and monitoring of the working status of the fuse.

[0038] The above description is only an embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the design concept of the present invention should be included in the scope of protection of the present invention.

Claims

1. An auxiliary fuse, comprising a housing, an auxiliary fuse guide post, a spring, a microswitch, an auxiliary contact of the microswitch, an indicator particle, a fastening nut, a connector, a connector fastening bolt, a base, an auxiliary fuse, a washer, and a base fastening bolt. The spring is placed into a recessed portion on the housing surface, the auxiliary fuse is then passed through a hole reserved in the housing and through the spring, tightened, and the auxiliary fuse is then arranged on the guide post in the housing cavity, with both ends connected and fixed to the connector fastening bolts. The indicator particle is mounted and fixed above the spring on the recessed portion on the housing surface and is internally secured by a fastening nut. The base is mounted into the bottom of the housing, the upper end of the connector is fixed to the housing surface by bolts, and the other end is mounted and fixed to the fuse. Characterized in that: The auxiliary fuse is arranged and installed in the auxiliary fuse and does not need to be installed in the fuse tube; The housing inner cavity guide pin is provided with multiple turns of fuse guide grooves and an auxiliary fuse extension guide pin to facilitate winding and arranging the auxiliary fuse; The connecting piece can be set to different lengths according to the different external dimensions of the melting tube, and the connecting hole with the shell includes a circular hole and a waist-shaped hole to facilitate fine-tuning; and the connecting hole includes two types: with thread and without thread.

2. An auxiliary fuse according to claim 1, characterized in that: The auxiliary fuse-link wound and arranged in the inner cavity of the housing can be arranged in different lengths as required to meet the requirements of different models and specifications.

3. The auxiliary fuse according to claim 1, characterized in that: The fastening nuts installed in the housing include internally embedded types and externally added types to meet different installation requirements.

4. The auxiliary fuse according to claim 1, characterized in that: The micro switch is provided with auxiliary contacts, which can be connected to the equipment / line background control system with wires, so as to facilitate observation of the working status of the fuse and timely detection and handling of system faults.

5. The auxiliary fuse according to claim 1, characterized in that: The auxiliary fuse is made of metal material.

6. The auxiliary fuse according to claim 1, characterized in that: The gasket is made of high-temperature resistant elastic material.

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