CN210347892U

CN210347892U - Short-circuit discharge device for polypropylene film capacitor

Info

Publication number: CN210347892U
Application number: CN201921001519.6U
Authority: CN
Inventors: 周定毅; 匡永正; 赵志明; 唐晓雯
Original assignee: WUXI HONGGUANG CAPACITOR CO Ltd
Current assignee: WUXI HONGGUANG CAPACITOR CO Ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2020-04-17
Anticipated expiration: 2029-06-28

Abstract

The utility model belongs to the technical field of the capacitor equipment, a polypropylene film is short circuit discharge device for electric capacity is related to, comprising a base plate, bottom plate surface fastening connects the fixed bolster, and the last cylinder of installing of fixed bolster corresponds to the fixed vacuum interrupter that sets up of the piston rod end of cylinder on the bottom plate, and vacuum interrupter is fixed on the bottom plate through fifth fixation nut, sixth fixation nut, seventh fixation nut and corresponding fix with screw by its afterbody from the support of taking, corresponds to the fixed ac contactor that sets up of vacuum interrupter's outer end on the bottom plate. The discharge device upgrades the original short-circuit discharge device with low safety and easy damage into a novel short-circuit discharge device with high safety, high test precision, long service life and low cost, and has an elastic contact electrode for protecting the leading-out end of the capacitor from being crushed, so as to screen out a product with hidden trouble of false connection between a gold spraying layer and a polypropylene film thickening metal area in the polypropylene film capacitor, and ensure the reliability of the long-term service life of the polypropylene film capacitor.

Description

Short-circuit discharge device for polypropylene film capacitor

Technical Field

The utility model belongs to the technical field of the electric capacity equipment, a polypropylene film is short circuit discharge device for electric capacity is related to.

Background

In recent years, with the economic development, the market demands higher and higher product quality, which presents a great challenge to the stability of the quality of polypropylene film capacitors.

The metal spraying process is a key process in the production process of the polypropylene film capacitor, the metal spraying layer is connected with a thickened metal area on the polypropylene film surface of the capacitor element through metal particles of the metal spraying, and a lead is welded on the metal spraying layer and is connected with a leading-out end on an end cover of the capacitor, so that the quality of the metal spraying layer directly determines the quality of the connection between the capacitor element and the leading-out end of the capacitor, and the quality of the polypropylene film capacitor is influenced. If the contact state of the metal spraying layer and the thickened metal area on the surface of the polypropylene film is poor, namely a false connection phenomenon exists, the conventional alternating current withstand voltage test of the capacitor cannot be screened out, and the overhigh alternating current voltage in the test can possibly reduce the withstand voltage of the film and influence the stability of the product quality of the polypropylene film capacitor. In addition, if the capacitor with poor contact state between the gold-sprayed layer and the thickened metal region on the surface of the polypropylene film is put into normal use, the contact loss of the capacitor is increased, the heat generation amount is increased when the capacitor is electrified for use, and the capacitor is easy to fail. And the direct-current high-voltage power supply is adopted in the short-circuit discharge test, so that the capacitor with poor contact state between the metal spraying layer and the thickened metal area on the polypropylene film surface can be effectively screened out, and the polypropylene film surface can not be damaged. Therefore, the short circuit discharge test is an important detection means for detecting the performance of the polypropylene film capacitor.

At present, the most commonly used short circuit discharge test devices in the market generally have two types, one is a lead, and the other is a copper electrode, but the two types of test devices have great problems. The lead test is unsafe and difficult to test, the copper electrode is easy to strike fire and is unsafe as well, the contact state is uncertain and easy to damage, the lead-out end of the capacitor is easy to crush, the two test modes are carried out in the air, the electrode is easy to weld and corrode after striking fire, the surface of the electrode is uneven, the contact resistance is large and small during the test, the current is unstable during the test, and therefore the two test modes can not meet the requirement of the market for the increasingly improved short-circuit discharge detection of the polypropylene film capacitor.

Disclosure of Invention

The utility model is directed to the above problem, the utility model provides a short circuit discharge device for polypropylene film electric capacity, this discharge device upgrades the low and fragile short circuit discharge device of original security to the security height, the measuring accuracy is high, long service life, with low costs and have the novel short circuit discharge device of the elastic contact electrode that the protection condenser draws forth the end and is not crushed, with the product that has "fake" hidden danger in the gold-spraying layer and polypropylene film thickening metal area in selecting polypropylene film electric capacity, ensure the long-term life reliability of polypropylene film capacitor.

According to the technical scheme of the utility model: a short-circuit discharge device for a polypropylene film capacitor is characterized in that: the vacuum arc extinguishing chamber is fixedly arranged on the bottom plate corresponding to the end part of a piston rod of the cylinder, the vacuum arc extinguishing chamber is fixed on the bottom plate through a support at the tail of the vacuum arc extinguishing chamber and a fifth fixing nut, a sixth fixing nut, a seventh fixing nut and corresponding screws, an alternating current contactor is fixedly arranged on the bottom plate corresponding to the outer end of the vacuum arc extinguishing chamber, the cylinder and the vacuum arc extinguishing chamber are fixedly connected in an occluded manner through internal threads of a connecting rod, the alternating current contactor is fixed on the bottom plate through an eighth fixing nut, a ninth fixing nut and corresponding screws, a contact of the vacuum arc extinguishing chamber is externally connected with a first connecting wire and a second connecting wire, the fifth fixing nut is externally connected with a third connecting wire, the seventh fixing nut is externally connected with a fourth connecting wire, and the other end of the fourth connecting wire is connected with the alternating current contactor, the other end of the third connecting wire is welded with a first contact electrode, the other end of the fourth connecting wire is connected with an alternating current contactor, the alternating current contactor is also connected with a fifth connecting wire, and the other end of the fifth connecting wire is connected with a power supply; and the other end of the first connecting wire is welded with a second contact electrode, and the other end of the second connecting wire is connected with a power supply.

As a further improvement of the present invention, the cylinder is fastened to the fixing bracket by a third fixing nut and a fourth fixing nut.

As a further improvement, both structures of first contact electrode, second contact electrode are the same, and wherein first contact electrode includes coupling nut, fixed cover shell, protection spring, electrode tip, set up protection spring in the hole of fixed cover shell, the electrode tip runs through the setting of protection spring hole, and the electrode tip upper end is stretched out and is fixed through coupling nut locking from the downthehole of fixed cover shell top, protection spring upper end top is tight in the top of fixed cover shell, and the protection spring lower extreme compresses tightly on the step of motor head.

As a further improvement, the fixing bracket is fixedly connected to the bottom plate through a first fixing nut, a second fixing nut and a corresponding screw.

As a further improvement of the present invention, the waist-shaped groove on the fixing bracket is respectively fixedly connected to the bottom plate with the first fixing nut, the second fixing nut and the corresponding screw.

The technical effects of the utility model reside in that: the utility model discloses the product is provided with vacuum interrupter, and with the help of the good insulating and arc-extinguishing performance in vacuum of a pair of sealed in-vacuum of usefulness (contact) and other parts, the closing of realization circuit is closed or is divided absolutely, can extinguish arc rapidly and inhibit current after the cut-off power supply. The vacuum arc extinguish chamber replaces the design of a wire or a copper electrode adopted in the conventional short circuit discharge device, the unique vacuum design of the vacuum arc extinguish chamber enables the contact state to be more stable, the circuit can be switched off instantly, and the vacuum arc extinguish chamber is safer and more reliable.

The utility model discloses the vacuum interrupter of product setting, with the electrode protection in vacuum medium, electric arc does not expose, and its vacuum can reach more than 1.33 x 10-3Pa, and dielectric strength is high, and electric arc easily extinguishes, and arc extinguishing ability is strong promptly, so can not take place the phenomenon of striking sparks, just also can not have the phenomenon of welding erosion electrode after striking sparks to take place, so contact resistance value and current value during the test are the constant value, and the measuring accuracy is higher. Meanwhile, the electric arc is not exposed, so that the dust in a workshop can be effectively prevented from explosion accidents, and the method is safer and more reliable.

The utility model discloses the vacuum interrupter long service life of product setting, its mechanical life can reach 150 ten thousand times, so this short circuit discharge device's reusability is high, has solved the easy fragile drawback of current short circuit discharge device, has reduced manufacturing cost, accords with economic benefits.

The utility model discloses the product is provided with ac contactor, and after the control circuit circular telegram, the contactor actuation, the last main contact that the current-limiting resistance line was gone into in cluster are in advance main contact switch-on down to reach and restrain the effect of gushing current, the completion after disconnection in the twinkling of an eye resets, main contact gets into normal work down during it, then is accomplished by main contact down during the open circuit, each department its responsibility. When the vacuum arc-extinguishing chamber is switched on and operated, the short-circuit discharge device carries out short-circuit discharge on the capacitor to be tested, the vacuum arc-extinguishing chamber is equivalent to a conducting wire at the moment, a power supply is short-circuited, excessive electric heat is generated at the moment, the temperature is rapidly increased, and the possibility of fire is caused. Therefore, the alternating current contactor is directly connected beside the power supply, and when the vacuum arc-extinguishing chamber is connected and operated, the loop where the power supply is located is automatically disconnected, so that the safety of the test is ensured.

The utility model discloses the product is provided with the elastic contact electrode, and it is the nut, fixed cover shell, the combined design of protection spring and electrode tip, and single copper electrode of non-, the design of electrode tip overhead protection spring for when contact electrode is connected with the electric capacity that awaits measuring, can provide the buffering protection, can effectively prevent that the electric capacity terminal that awaits measuring from being crushed, thereby reduce the electric capacity terminal that awaits measuring and crush and lead to condemned unnecessary waste, promote the direct rate of production of polypropylene film capacitor.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a top view of fig. 1.

Fig. 3 is a schematic structural diagram of the first contact electrode or the second contact electrode of the present invention.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings.

In the figures 1 to 3, the device comprises a bottom plate 1, a fixed bracket 2, a cylinder 3, a vacuum arc-extinguishing chamber 4, an alternating current contactor 5, a power supply 6, a first contact electrode 7-1, a second contact electrode 7-2, a capacitor to be tested 8, a first connecting wire 9-1, a second connecting wire 9-2, a third connecting wire 9-3, a fourth connecting wire 9-4 and a fifth connecting wire 9-5, the device comprises a first fixing nut 10-1, a second fixing nut 10-2, a third fixing nut 10-3, a fourth fixing nut 10-4, a fifth fixing nut 10-5, a sixth fixing nut 10-6, a seventh fixing nut 10-7, an eighth fixing nut 10-8, a ninth fixing nut 10-9, a connecting nut 11, a fixing sleeve 12, a protection spring 13, an electrode tip 14 and the like.

As shown in figures 1-3, the utility model relates to a short circuit discharge device for polypropylene film capacitor, which comprises a bottom plate 1, wherein the surface of the bottom plate 1 is fastened and connected with a fixed bracket 2, a cylinder 3 is arranged on the fixed bracket 2, a vacuum arc extinguish chamber 4 is fixedly arranged on the bottom plate 1 corresponding to the end part of a piston rod of the cylinder 3, the vacuum arc extinguish chamber 4 is fixed on the bottom plate 1 through a bracket arranged at the tail part of the vacuum arc extinguish chamber by a fifth fixing nut 10-5, a sixth fixing nut 10-6, a seventh fixing nut 10-7 and corresponding screws, an AC contactor 5 is fixedly arranged on the bottom plate 1 corresponding to the outer end of the vacuum arc extinguish chamber 4, the cylinder 3 is fixedly occluded and connected with the vacuum arc extinguish chamber 4 through the internal threads of a connecting rod, the AC contactor 5 is fixed on the bottom plate 1 through an eighth fixing nut 10-8, a ninth, the contact of the vacuum arc extinguish chamber 4 is externally connected with a first connecting wire 9-1 and a second connecting wire 9-2, a fifth fixing nut 10-5 is externally connected with a third connecting wire 9-3, a seventh fixing nut 10-7 is externally connected with a fourth connecting wire 9-4, the other end of the fourth connecting wire 9-4 is connected with an alternating current contactor 5, a first contact electrode 7-1 is welded at the other end of the third connecting wire 9-3, the other end of the fourth connecting wire 9-4 is connected with the alternating current contactor 5, the alternating current contactor 5 is also connected with a fifth connecting wire 9-5, and the other end of the fifth connecting wire 9-5 is connected with a power supply 6; the other end of the first connecting wire 9-1 is welded with a second contact electrode 7-2, and the other end of the second connecting wire 9-2 is connected with a power supply 6.

The cylinder 3 is fastened and connected on the fixed bracket 2 through a third fixed nut 10-3 and a fourth fixed nut 10-4.

The first contact electrode 7-1 and the second contact electrode 7-2 have the same structure, wherein the first contact electrode 7-1 comprises a connecting nut 11, a fixed casing 12, a protection spring 13 and an electrode tip 14, the protection spring 13 is arranged in an inner hole of the fixed casing 12, the electrode tip 14 penetrates through the inner hole of the protection spring 13, the upper end of the electrode tip 14 extends out of the hole at the top of the fixed casing 12 and is locked and fixed through the connecting nut 11, the upper end of the protection spring 13 abuts against the top of the fixed casing 12, and the lower end of the protection spring 13 is pressed on a step of the motor tip 14.

The fixed bracket 2 is fixedly connected to the bottom plate 1 through a first fixed nut 10-1, a second fixed nut 10-2 and corresponding screws.

The waist-shaped groove on the fixing bracket 2 is respectively fixedly connected with the first fixing nut 10-1, the second fixing nut 10-2 and the corresponding screw on the bottom plate 1.

Claims

1. A short-circuit discharge device for a polypropylene film capacitor is characterized in that: the vacuum arc extinguishing device comprises a bottom plate (1), wherein the bottom plate (1) is fastened and connected with a fixed support (2), a cylinder (3) is installed on the fixed support (2), a vacuum arc extinguishing chamber (4) is fixedly arranged on the bottom plate (1) corresponding to the end part of a piston rod of the cylinder (3), the vacuum arc extinguishing chamber (4) is fixed on the bottom plate (1) through a fifth fixing nut (10-5), a sixth fixing nut (10-6), a seventh fixing nut (10-7) and corresponding screws by a support arranged at the tail part of the vacuum arc extinguishing chamber, an alternating current contactor (5) is fixedly arranged on the bottom plate (1) corresponding to the outer end of the vacuum arc extinguishing chamber (4), the cylinder (3) is fixedly meshed and connected with the vacuum arc extinguishing chamber (4) through internal threads of a connecting rod, and the alternating current contactor (5) is fixed on the bottom plate (1) through an eighth fixing nut (10-8), a ninth, the contact of the vacuum arc-extinguishing chamber (4) is externally connected with a first connecting wire (9-1) and a second connecting wire (9-2), a fifth fixing nut (10-5) is externally connected with a third connecting wire (9-3), a seventh fixing nut (10-7) is externally connected with a fourth connecting wire (9-4), the other end of the fourth connecting wire (9-4) is connected with an alternating current contactor (5), a first contact electrode (7-1) is welded at the other end of the third connecting wire (9-3), the other end of the fourth connecting wire (9-4) is connected with the alternating current contactor (5), the alternating current contactor (5) is further connected with a fifth connecting wire (9-5), and the other end of the fifth connecting wire (9-5) is connected with a power supply (6); the other end of the first connecting wire (9-1) is welded with a second contact electrode (7-2), and the other end of the second connecting wire (9-2) is connected with a power supply (6).

2. The short circuit discharge device for polypropylene film capacitor as claimed in claim 1, wherein: the air cylinder (3) is fixedly connected to the fixed support (2) through a third fixed nut (10-3) and a fourth fixed nut (10-4).

3. The short circuit discharge device for polypropylene film capacitor as claimed in claim 1, wherein: the structure of the first contact electrode (7-1) and the second contact electrode (7-2) are the same, wherein the first contact electrode (7-1) comprises a connecting nut (11), a fixed casing (12), a protection spring (13) and an electrode tip (14), the protection spring (13) is arranged in an inner hole of the fixed casing (12), the electrode tip (14) penetrates through the inner hole of the protection spring (13), the upper end of the electrode tip (14) extends out of the inner hole in the top of the fixed casing (12) and is locked and fixed through the connecting nut (11), the upper end of the protection spring (13) is tightly pressed against the top of the fixed casing (12), and the lower end of the protection spring (13) is tightly pressed on a step of the electrode tip (14).

4. The short circuit discharge device for polypropylene film capacitor as claimed in claim 1, wherein: the fixing support (2) is fixedly connected to the bottom plate (1) through a first fixing nut (10-1), a second fixing nut (10-2) and corresponding screws.

5. The short circuit discharge device for polypropylene film capacitor as claimed in claim 4, wherein: the waist-shaped groove on the fixing support (2) is respectively fixedly connected with the first fixing nut (10-1), the second fixing nut (10-2) and the corresponding screw on the bottom plate (1).