A fusible resistor and a manufacturing method thereof

Abstract

The application provides a fusible resistor and a manufacturing method thereof, comprising a pressure-divided rod, the outer wall of the pressure-divided rod is provided with a notch, the both ends of the pressure-divided rod are tin soldered with a cap, the outer wall center of each cap is provided with a lead positioning piece, the inside of each lead positioning piece is penetrated by a lead, and the inner end of the lead is tin soldered with the cap; the outer wall of the pressure-divided rod and the cap is sprayed with an insulating protective layer; the manufacturing method comprises the following steps: selecting a pressure-divided rod; notching the pressure-divided rod; firmly welding the lead and the cap together; uniformly coating the outer wall of the pressure-divided rod and the cap with an insulating protective layer; and marking a color ring on the outer surface of the insulating protective layer. The application releases the impact force in the moment of fusing by adjusting the film-forming structure of the coating, so as to achieve the effect of preventing the coating from being broken and preventing fire; the pressure-divided rod is selected to be a pulse-resistant pressure-divided rod, so that the resistor can meet the pulse and be fused under the specified voltage; the resistor is convenient to manufacture, simple in structure, low in price and low in production cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of resistor, in particular to a fusible resistor and a manufacturing method thereof. BACKGROUND

[0002] The anti-burst and anti-fire resistor which can meet pulse and fusing is a special element with dual functions of resistor and fuse, and the resistor requires that it can withstand the sudden high voltage in the circuit and fuse in a specified time to protect the working environment. The anti-burst and anti-fire resistor which can meet pulse and fusing is widely used in industrial field, household appliance field and the like. The anti-burst and anti-fire resistor which can meet pulse and fusing requires high-voltage pulse resistance and fusing, and there is no such product in China at present, and imported products are used at the use end, which are high in price. SUMMARY

[0003] In view of the defects in the prior art, the present application aims to provide a fusible resistor, which can solve the problem that the existing resistor cannot meet fusing, anti-burst and anti-fire at low cost.

[0004] In order to achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0005] The present application is realized by the following technical scheme: a fusible resistor, comprising a pressure dividing rod, a groove is formed in the outer wall of the pressure dividing rod, a cap is tin soldered at each end of the pressure dividing rod, a lead positioning piece is arranged at the center of the outer wall of each cap, a lead is penetrated through the inside of each lead positioning piece, and the inner end of the lead is tin soldered to the cap; and an insulating protective layer is sprayed on the outer walls of the pressure dividing rod and the cap.

[0006] Further, the groove is continuous spiral, and the edges of the groove are smooth structures.

[0007] Further, the groove width of the groove is less than 0.3mm.

[0008] Further, the lead is a galvanized copper wire.

[0009] Further, the ingredient ratio of the insulating protective layer is: silicone resin: quartz sand: coupling agent; modified imidazole = 1kg: 20g: 10g: 1g.

[0010] Further, the lead positioning piece comprises an outer cover body, a wire hole is formed in the center of the outer cover body for the lead to penetrate through; the outer cover body comprises a front ring body, a cone body and a rear ring body, the outer end of the cone body is provided with the front ring body, the rear end is provided with the rear ring body, the outer diameter of the front ring body is greater than that of the rear ring body, and the rear ring body is welded to the cap.

[0011] Further, the outer wall of the cone is symmetrically provided with a first operation window and a second operation window, the first operation window and the second operation window are oppositely arranged outside the lead wire, a first sealing plug is embedded in the first operation window, and a second sealing plug is embedded in the second operation window.

[0012] Further, a plurality of first connecting ribs are arranged in the first operation window along the axial direction, the inner wall of the first connecting rib is flush with the inner wall of the cone, and the thickness of the first connecting rib is smaller than the thickness of the cone; each first connecting rib is glued to the lead wire; the first sealing plug abuts against the outer wall of the first connecting rib; a plurality of second connecting ribs are arranged in the second operation window along the axial direction, the inner wall of the second connecting rib is flush with the inner wall of the cone, and the thickness of the second connecting rib is smaller than the thickness of the cone; and the second sealing plug abuts against the outer wall of the second connecting rib.

[0013] A manufacturing method of a fusible resistor, the manufacturing method comprising the following steps:

[0014] A pressure dividing rod capable of meeting pulse impact and melting at a specified voltage is selected;

[0015] Grooves are engraved on the pressure dividing rod, the appearance of the grooves should be continuous, uniformly distributed, and the edges should be smooth, without phenomena such as broken grooves, sawteeth, burrs, and concave-convex surfaces, the groove depth is limited to engraving through the film layer, and should not be too deep or not engraved through;

[0016] The lead wire and the cap are firmly welded together, and lead-out ends are added to both ends of the pressure dividing rod;

[0017] An insulating protective layer is uniformly coated on the outer wall of the pressure dividing rod and the cap;

[0018] A color ring mark is made on the outer surface of the insulating protective layer.

[0019] Further, the lead wire positioning member is sleeved on the lead wire, and the lead wire positioning member is welded on the cap; the first connecting rib is glued to the lead wire; and the first sealing plug and the second sealing plug are loaded.

[0020] Compared with the prior art, the beneficial effects of the present application include:

[0021] The present application releases the impact force at the moment of melting by adjusting the film structure of the coating, thereby achieving the effect of preventing the coating layer from exploding and preventing fire;

[0022] The pressure dividing rod of the present application is selected from pulse-resistant pressure dividing rods, so that the resistor can meet the pulse and melt at a specified voltage;

[0023] The resistor of the present application is convenient to manufacture, simple in structure, low in price, and low in production cost. BRIEF DESCRIPTION OF DRAWINGS

[0024] The disclosure of the present application will be described with reference to the accompanying drawings. It is to be noted that the drawings are only for the purpose of illustration and are not intended to limit the scope of protection of the present application, in which the same reference numerals are used to refer to the same components. Among them:

[0025] Figure 1 It is a schematic diagram of the overall structure of a fusible resistor of the present application;

[0026] Figure 2 It is a schematic diagram of the structure of a pressure distribution rod of the present application;

[0027] Figure 3 It is a schematic diagram of the manufacturing method of a fusible resistor of the present application;

[0028] Figure 4 It is a schematic diagram of the internal cross-sectional structure of a lead positioning member of the present application;

[0029] Figure 5 It is a schematic diagram of the structure of a lead positioning member of the present application;

[0030] The figure is marked as follows: 1, pressure distribution rod; 11, groove; 2, cap; 3, insulating protective layer; 4, lead positioning member; 41, front ring body; 42, cone; 421, first operation window; 4211, first connecting rib; 422, second operation window; 4221, second connecting rib; 43, rear ring body; 44, wire hole; 5, lead; 6, first sealing plug; 7, second sealing plug. DETAILED DESCRIPTION

[0031] It is easy to understand that according to the technical scheme of the present application, a person skilled in the art can propose a plurality of structure modes and implementation modes which can be replaced with each other without changing the essential spirit of the present application. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical scheme of the present application, and should not be regarded as the whole or as a limitation or restriction on the technical scheme of the present application.

[0032] Example one

[0033] A fusible resistor, as shown in Figure 1 and Figure 2 , comprises a pressure distribution rod 1, the outer wall of the pressure distribution rod 1 is provided with a groove 11, and the two ends of the pressure distribution rod 1 are both tin soldered with a cap 2, the outer wall center of each cap 2 is provided with a lead positioning member 4, the inside of each lead positioning member 4 is penetrated by a lead 5, and the inner end of the lead 5 is tin soldered to the cap 2; the outer walls of the pressure distribution rod 1 and the cap 2 are sprayed with an insulating protective layer 3.

[0034] In this embodiment, the groove 11 is continuous spiral, and the edges of the groove 11 are smooth structures.

[0035] In this embodiment, the groove width of the groove 11 is less than 0.3 mm. The groove depth is limited to penetrating the outermost film layer of the pressure dividing rod 1; it should not be too deep, nor should it be incomplete.

[0036] In this embodiment, the lead wire 5 is a galvanized copper wire.

[0037] In this embodiment, the ratio of silicone resin: quartz sand: coupling agent; modified imidazole is 1 kg: 20 g: 10 g: 1 g.

[0038] like Figure 3 As shown, in this embodiment, the method for manufacturing a fusible resistor includes the following steps:

[0039] A pressure dividing rod 1 capable of withstanding pulse impacts and melting under specified voltage is selected. The product made from pressure dividing rod 1 has a 270uF capacitor connected in parallel after the resistor. After 10,000 pulses under AC power, the resistance change rate is <±1%, and it melts within a specified time under 220V AC voltage to protect the circuit. Grooves 11 are etched on pressure dividing rod 1. The grooves 11 should be continuous, evenly distributed, and have smooth edges, without any breaks, serrations, burrs, or uneven surfaces. The groove depth should be limited to penetrating the film layer; it should not be too deep or incomplete. Leads 5 are firmly welded to cap 2, and leads are added to both ends of pressure dividing rod 1. An insulating protective layer 3 is evenly coated on the outer walls of pressure dividing rod 1 and cap 2. The insulating protective layer 3 is a special coating that is explosion-proof and fire-proof. Color ring markings are affixed to the outer surface of the insulating protective layer 3.

[0040] This embodiment has the following technical effects: by adjusting the film-forming structure of the coating to release the impact force at the moment of melting, the coating layer is protected against cracking and fire; the selection of the pulse-resistant voltage divider 1 ensures that the resistor can meet the pulse requirements and melt under the specified voltage; the above resistor is easy to manufacture, has a simple structure, is inexpensive, and has low production cost.

[0041] To verify the above technical effects, the following comparative experiment was conducted: two traditional resistors were selected as comparative example 1 and comparative example 2, and a resistor made of pulse voltage divider bar and special coating layer in this embodiment was selected as comparative example 3.

[0042]

[0043] As can be seen from the table above, the resistor that can meet the requirements of pulse and melt under the specified voltage, and whose coating does not crack or catch fire during the melting process, has the best performance.

[0044] Example 2

[0045] like Figure 4 andFigure 5 On the basis of the above-mentioned embodiments, the present embodiment further gives the following contents:

[0046] The lead positioning member 4 comprises an outer cover body, a wire hole 44 is provided at the center of the outer cover body for the lead 5 to pass through; the outer cover body comprises a front ring body 41, a cone body 42, and a rear ring body 43, the outer end of the cone body 42 is provided with the front ring body 41, and the rear end is provided with the rear ring body 43, the outer diameter of the front ring body 41 is larger than that of the rear ring body 43, and the rear ring body 43 is welded on the cap 2; by designing the outer cover body, the tin soldering position of the lead 5 and the compression dividing rod 1 can be protected, thereby improving the strength of the position and solving the problem of easy breakage, and further improving the explosion-proof capability of the resistor.

[0047] The outer wall of the cone body 42 is symmetrically provided with a first operation window 421 and a second operation window 422, the first operation window 421 and the second operation window 422 are oppositely arranged outside the lead 5, a first sealing plug 6 is embedded in the inside of the first operation window 421 in interference, and a second sealing plug 7 is embedded in the inside of the second operation window 422 in interference. Since the outer cover body covers the connection position of the lead 5 and the resistor, the current value at the position cannot be detected when the equipment is overhauled, by providing the first operation window 421 and the second operation window 422, the current table probe can be inserted into the operation window to contact the lead 5, the current at the root of the lead 5 can be detected, and the performance of the resistor can be judged by the maintenance personnel; the sealing plug can seal the operation window when not in use, so as to avoid the entry of external impurities.

[0048] A plurality of first connecting ribs 4211 are arranged in the inside of the first operation window 421 along the axial direction, the inner wall of the first connecting rib 4211 is flush with the inner wall of the cone body 42, and the thickness of the first connecting rib 4211 is smaller than that of the cone body 42; each first connecting rib 4211 is glued to the lead 5; the first sealing plug 6 abuts against the outer wall of the first connecting rib 4211; a plurality of second connecting ribs 4221 are arranged in the inside of the second operation window 422 along the axial direction, the inner wall of the second connecting rib 4221 is flush with the inner wall of the cone body 42, and the thickness of the second connecting rib 4221 is smaller than that of the cone body 42; the second sealing plug 7 abuts against the outer wall of the second connecting rib 4221.

[0049] The first connecting rib 4211 and the second connecting rib 4221 can improve the strength of the operation window, at the same time, the first connecting rib 4211 is glued to the lead 5 to position the lead 5, thereby increasing the positioning surface of the lead 5 and further improving the strength of the lead 5, the first operation window 421 can facilitate the observation and gluing operation of the operator; the second operation window 422 is the main detection position. The lead positioning member 4 is welded after the lead is fixed.

[0050] The present application releases the impact force in the moment of fusing by adjusting the film forming structure of the paint, so as to achieve the effect of preventing the coating layer from being broken and catching fire.

[0051] The pulse-resistant pressure distribution rod is selected for the resistor, so that the resistor can meet the pulse and be fused at a specified voltage.

[0052] The resistor is convenient to manufacture, simple in structure, low in price and production cost.

[0053] The technical scope of the present application is not limited to the above description, and those skilled in the art can make various modifications and changes to the above embodiments without departing from the technical idea of the present application, and these modifications and changes should be within the protection scope of the present application.

Claims

1. A fusible resistor, characterized in that: The test includes a pressure dividing rod (1), the outer wall of which is provided with grooves (11), and caps (2) are soldered to both ends of the pressure dividing rod (1). Each cap (2) has a lead wire positioning component (4) at the center of its outer wall, and a lead wire (5) runs through the interior of each lead wire positioning component (4). The inner end of the lead wire (5) is soldered to the cap (2). The outer walls of the pressure dividing rod (1) and the caps (2) are coated with an insulating protective layer (3). The mixing ratio of the insulating protective layer (3) is: silicone resin: quartz sand: coupling agent; modified imidazole = 1kg: 20g: 10g: 1g; The lead wire positioning component (4) includes an outer cover, and a wire hole (44) for the lead wire to pass through is provided at the center of the outer cover; the outer cover includes a front ring (41), a cone (42), and a rear ring (43), and a first operating window (421) and a second operating window (422) are symmetrically provided on the outer wall of the cone (42). The first operating window (421) has a plurality of first connecting ribs (4211) spaced apart along the axial direction inside. The inner wall of the first connecting rib (4211) is flush with the inner wall of the cone (42), and the thickness of the first connecting rib (4211) is less than the thickness of the cone (42). Each first connecting rib (4211) is bonded to the lead wire. The first sealing plug (6) abuts against the outer wall of the first connecting rib (4211). The interior of the second operation window (422) is provided with a plurality of second connecting ribs (4221) spaced apart along the axial direction. The inner wall of the second connecting rib (4221) is flush with the inner wall of the cone (42), and the thickness of the second connecting rib (4221) is less than the thickness of the cone (42). The second sealing plug (7) abuts against the outer wall of the second connecting rib (4221).

2. The fusible resistor according to claim 1, characterized in that: The groove (11) is a continuous spiral shape, and the edges of the groove (11) are all smooth.

3. A fusible resistor according to claim 1, characterized in that: The groove width of the groove (11) is less than 0.3 mm.

4. A fusible resistor according to claim 1, characterized in that: The lead wire (5) is a galvanized copper wire.

5. A fusible resistor according to claim 1, characterized in that: The cone (42) has a front ring (41) at its outer end and a rear ring (43) at its rear end. The outer diameter of the front ring (41) is larger than the outer diameter of the rear ring (43), and the rear ring (43) is welded to the cap (2).

6. A fusible resistor according to claim 5, characterized in that: The first operating window (421) and the second operating window (422) are positioned opposite each other outside the lead wire (5). The first operating window (421) has a first sealing plug (6) embedded inside, and the second operating window (422) has a second sealing plug (7) embedded inside.

7. The method for manufacturing a fusible resistor according to claim 1, characterized in that: The manufacturing method includes the following steps: Select a pressure-breaking bar that can withstand pulse impact and melt under specified voltage (1); Grooves (11) are engraved on the pressure bar (1). The grooves (11) should be continuous, evenly distributed, and have smooth edges. Weld the lead wire (5) firmly to the cap (2) and add lead-out ends to both ends of the pressure bar (1); An insulating protective layer (3) is evenly applied to the outer wall of the pressure bar (1) and the cap (2); Color rings are marked on the outer surface of the insulating protective layer (3).

8. The method for manufacturing a fusible resistor according to claim 7, characterized in that: The manufacturing method further includes: fitting the lead wire positioning piece (4) onto the lead wire (5) and welding the lead wire positioning piece (4) onto the cap (2); gluing the first connecting rib (4211) to the lead wire (5); and installing the first sealing plug (6) and the second sealing plug (7).

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