Explosion-proof capacitor

Abstract

The utility model provides an explosion-proof capacitor, belongs to the technical field of capacitors, and solves the problem that an existing explosion-proof capacitor cannot be reused after triggering an explosion-proof function. The explosion-proof shell is provided with a mounting seat, a mounting seat mounting core body, a through hole formed in the mounting seat, a cover plate mounted on the top of the explosion-proof shell, a vent hole formed in the bottom of the explosion-proof shell, a vent valve mounted in the vent hole, mounting grooves formed in the two sides of the vent hole, limiting plates mounted in the mounting grooves, and corresponding limiting grooves formed in the top of the vent valve; the limiting plate is provided with a fracture belt, the vent valve is provided with a reset part, a first spring is installed between the reset part and the anti-explosion shell, and the limiting plate is connected to the installation groove in a clamped mode. The air vent valve has the advantages that the air vent valve is reset through the cooperation of the first spring and the reset part, so that the air vent valve can be used after exhausting; and the limiting plate is clamped with the mounting groove, so that after the limiting plate is broken due to ejection of the vent valve, the limiting plate can be replaced, and the normal running of the explosion-proof function is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the capacitor field relates to a capacitor, especially to a kind of explosion-proof capacitor. BACKGROUND

[0002] The operation of capacitor is over the service life, due to the excessive self-healing of metallized film and the aging of polypropylene film under the action of electric field for a long time, more heat is generated, polypropylene and impregnant will decompose and produce a large amount of gas, the gas makes the internal pressure of shell rise, and then lead to explosion.

[0003] In order to prevent capacitor explosion, manufacturers have taken various measures, such as setting fragile welding points on the cover plate of the shell, so that when the gas pressure in the shell increases, the welding points break, the cover plate lifts together with the pins, disconnects the connection between the pins and the core, and releases the internal gas, which eliminates the explosion-proof function, but this function can only be used once, and cannot be used repeatedly.

[0004] For example, the application number CN201721113619.9 is a kind of capacitor, including connecting shaft, cover plate and electrode sheet, cover plate is equipped with perforation, connecting shaft passes through perforation, electrode sheet is welded at the end of connecting shaft, and insulating ejection mechanism is arranged on the inner wall of perforation for separating electrode sheet and connecting shaft.

[0005] The above-mentioned patent prevents the pins from contacting the core after the explosion-proof function is triggered by setting the insulating ejection mechanism, which causes the capacitor to continue to work, but the explosion-proof function of the capacitor is invalid, and it needs to be replaced completely, which has high cost. UTILITY MODEL CONTENTS

[0006] The utility model aims at the above-mentioned problems existing in prior art, and provides a kind of capacitor that can discharge gas due to gas pressure and can repeatedly use explosion-proof function.

[0007] The utility model can be realized by the following technical scheme: an explosion-proof capacitor, including explosion-proof shell, installation seat is set on the explosion-proof shell, the core is installed on the installation seat, the air hole is opened in the installation seat, the cover plate is installed on the top of explosion-proof shell, the air hole is opened in the bottom of explosion-proof shell, the air valve is installed in the air hole, the installation groove is opened in the air hole two sides, the limit plate is installed in the installation groove, the limit slot is opened in the top of air valve, the break zone is set on the limit plate.

[0008] In the above-mentioned explosion-proof capacitor, the dust screen is installed on the air hole.

[0009] In the above-mentioned explosion-proof capacitor, the taper part is set on the air valve, and the sealing pad is sleeved on the taper part.

[0010] The vent pipe is provided below the conical part, and a gas outlet hole is formed in the vent pipe.

[0011] The reset part is provided below the vent pipe, and a spring one is arranged between the reset part and the explosion-proof shell.

[0012] The reset part is provided below the vent pipe, and a spring one is arranged between the reset part and the explosion-proof shell.

[0013] The mounting groove is provided with a clamping groove, the limiting plate is provided with a clamping rod, and a groove is formed in the mounting groove away from the vent valve.

[0014] The mounting groove is provided with a clamping groove, the limiting plate is provided with a clamping rod, and a groove is formed in the mounting groove away from the vent valve.

[0015] Compared with the prior art, the explosion-proof shell is provided with a resettable vent valve, which ensures that the vent valve can be reset after releasing gas, and a replaceable limiting plate is arranged, which can be replaced through the reserved groove after the fracture belt breaks, so that the explosion-proof function can be used again. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the bottom view of the explosion-proof capacitor;

[0017] Figure 2 is the first sectional view of the explosion-proof capacitor;

[0018] Figure 3 is the second sectional view of the explosion-proof capacitor;

[0019] Figure 4 is the perspective view of the fixing strip of the explosion-proof capacitor;

[0020] 1, explosion-proof shell; 11, vent hole; 12, mounting groove; 121, clamping groove; 122, groove; 13, guide hole; 2, mounting seat; 21, through hole; 3, core; 4, cover plate; 5, vent valve; 51, conical part; 511, sealing gasket; 52, vent pipe; 521, gas outlet hole; 53, reset part; 531, guide rod; 54, spring one; 6, limiting plate; 61, fracture belt; 62, clamping rod; 7, dust screen; 8, fixing strip; 81, limiting hole; 9, limiting block; 91, spring two. DETAILED DESCRIPTION

[0021] The utility model discloses a specific embodiment as follows and further describes the technical scheme of the utility model in connection with the drawings, but the utility model is not limited to these embodiments.

[0022] As Figures 1 to 4 The utility model discloses a kind of explosion-proof capacitors, including explosion-proof shell 1, installation seat 2 is provided on explosion-proof shell 1, core body 3 is installed on installation seat 2, through-hole 21 is opened in installation seat 2, cover plate 4 is installed on the top of explosion-proof shell 1, vent hole 11 is opened in the bottom of explosion-proof shell 1, vent valve 5 is installed in vent hole 11, installation groove 12 is opened in the both sides of vent hole 11, limit plate 6 is installed in installation groove 12, corresponding limit slot is opened in the top of vent valve 5, limit plate 6 is provided with fracture zone 61.

[0023] The installation of installation seat 2 is used to separate the space between core body 3 and explosion-proof shell 1, facilitate gas circulation;Vent hole 11 is the passage for gas release in explosion-proof shell 1, the setting of vent valve 5 makes gas release after reaching certain pressure;Limit plate 6 is used to limit vent valve 5 to send out vent hole 11 due to the push of gas;The opening of fracture zone 61 makes fracture zone 61 break when gas reaches certain condition, so that vent valve 5 is pushed out by gas.

[0024] As Figure 2 And Figure 3 Vent hole 11 is installed with dust screen 7, as shown in the drawings. Because explosion-proof shell 1 needs to be reused, so that vent valve 5 may bring external air during exhaust process, dust screen 7 can prevent impurities in external air from flowing into explosion-proof shell 1.

[0025] As Figure 2 And Figure 3 Tapered portion 51 is provided on vent valve 5, and sealing pad 511 is sleeved on tapered portion 51. Tapered portion 51 and sealing pad 511 cooperate to seal vent hole 11, to prevent external air from communicating with explosion-proof shell 1.

[0026] As Figure 2 And Figure 3 Vent pipe 52 is provided below tapered portion 51, and air outlet 521 is opened in vent pipe 52. Vent pipe 52 serves as a passage for discharging gas, and when vent valve 5 moves out of vent hole 11, gas is discharged through air outlet 521.

[0027] As Figure 3 Reset portion 53 extends below vent pipe 52, and spring one 54 is arranged between reset portion 53 and explosion-proof shell 1. Reset portion 53 is used to reset vent valve 5, so that vent valve 5 is reset by cooperating with spring one 54 after completing exhaust to reduce the internal pressure of explosion-proof gas, so that vent valve 5 can repeatedly exhaust.

[0028] As Figure 3 shown, the reset part 53 is provided with a guide rod 531, and the explosion-proof housing 1 is provided with a guide hole 13. The guide rod 531 cooperates with the guide hole 13 to guide the movement of the breather valve 5, preventing the breather valve 5 from deviating during movement, which causes the breather valve 5 and the breather hole 11 to fail to be in close contact.

[0029] As Figure 1 and Figure 2 shown, the mounting groove 12 is provided with a clamping groove 121, the limiting plate 6 is provided with a clamping rod 62, and the mounting groove 12 is provided with a recess 122 at the end away from the breather valve 5. The limiting plate 6 is installed in the mounting groove 12 by clamping the clamping rod 62 into the clamping groove 121, facilitating the replacement of the limiting plate 6; the recess 122 is provided to facilitate the user to take out the limiting plate 6.

[0030] As Figure 1 , Figure 2 and Figure 4 shown, the mounting groove 12 is rotatably provided with a fixing strip 8, the fixing strip 8 is provided with a limiting hole 81, the explosion-proof housing 1 is provided with a limiting block 9, and the limiting block 9 and the mounting groove 12 are provided with a spring 91. The fixing strip 8 is used to limit the rotation of the limiting plate 6, preventing the displacement of the limiting plate 6 caused by the pushing of the breather hole 11, which causes the breather valve 5 to be opened when the pressure in the explosion-proof housing 1 does not reach the set value; the limiting block 9 is used to clamp the explosion-proof housing 1 and the fixing strip 8; and the spring 91 is used to reset the limiting block 9.

[0031] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

[0032] Although various terms are used herein, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present application; any interpretation of them as any kind of additional limitation is contrary to the spirit of the present application.

Claims

1. An explosion-proof capacitor, characterized in that, The explosion-proof housing (1) includes a mounting base (2) on the explosion-proof housing (1), a core (3) on the mounting base (2), a through hole (21) on the mounting base (2), a cover plate (4) on the top of the explosion-proof housing (1), a vent hole (11) on the bottom of the explosion-proof housing (1), a vent valve (5) installed in the vent hole (11), mounting grooves (12) on both sides of the vent hole (11), a limiting plate (6) installed in the mounting groove (12), a corresponding limiting groove on the top of the vent valve (5), and a fracture band (61) on the limiting plate (6).

2. The explosion-proof capacitor according to claim 1, characterized in that, A dust-blocking net (7) is installed on the ventilation hole (11).

3. The explosion-proof capacitor according to claim 1, characterized in that, The vent valve (5) is provided with a conical part (51), and a sealing gasket (511) is provided on the conical part (51).

4. The explosion-proof capacitor according to claim 3, characterized in that, A vent pipe (52) is provided below the conical part (51), and an air outlet (521) is provided on the vent pipe (52).

5. The explosion-proof capacitor according to claim 4, characterized in that, A reset part (53) extends below the vent pipe (52), and a spring (54) is provided between the reset part (53) and the explosion-proof housing (1).

6. The explosion-proof capacitor according to claim 5, characterized in that, The reset part (53) is provided with a guide rod (531), and the explosion-proof housing (1) is provided with a guide hole (13).

7. The explosion-proof capacitor according to claim 1, characterized in that, The mounting groove (12) is provided with a slot (121), the limiting plate (6) is provided with a locking rod (62), and the mounting groove (122) is provided at the end away from the vent valve (5).

8. The explosion-proof capacitor according to claim 1, characterized in that, A fixing strip (8) is rotatably installed next to the mounting groove (12), and a limiting hole (81) is opened next to the fixing strip (8). A limiting block (9) is installed on the explosion-proof housing (1), and a spring (91) is installed between the limiting block (9) and the mounting groove (12).

Images