CN210041768U

CN210041768U - Feed-through filter with non-offset central screw

Info

Publication number: CN210041768U
Application number: CN201921087631.6U
Authority: CN
Inventors: 李伟
Original assignee: SHANGHAI AERODEV ELECTROMAGNETIC CO Ltd
Current assignee: SHANGHAI AERODEV ELECTROMAGNETIC CO Ltd
Priority date: 2019-07-10
Filing date: 2019-07-10
Publication date: 2020-02-07
Anticipated expiration: 2029-07-10

Abstract

The utility model provides a feed-through filter that central screw rod does not squint, including the wave filter main part, the wave filter main part includes the casing, is equipped with feedthrough electric capacity in the casing, is equipped with the electric capacity clamp plate on the feedthrough electric capacity, is equipped with nut one on the electric capacity clamp plate, and central screw rod from the top down passes casing, nut one, electric capacity clamp plate and feedthrough electric capacity in proper order, is equipped with the location junk ring between electric capacity clamp plate and the nut one, and the location junk ring is overlapped on central screw rod, and the location junk ring is equipped with the jack catch that is used for blocking feedthrough electric capacity and electric capacity clamp plate towards. The central screw rod of the utility model is always positioned on the central line of the filter, so that the offset can not occur, on one hand, the large nut and the shell can not generate large stress when the filter is installed, and the feedthrough capacitor in the shell can not be damaged; on the other hand, the contact area between the filter shell and the installation metal plate can be increased, so that the shell and the metal plate are in low-impedance contact, and the bypass effect of the filter capacitor is ensured.

Description

Feed-through filter with non-offset central screw

Technical Field

The utility model relates to a feed-through filter that central screw rod does not squint, mainly used restraines the interference of high frequency harmonic to signal, power cord etc. belongs to information security technical field.

Background

With the rapid increase of the operating frequency of electronic devices, the frequency of electromagnetic interference is also higher and higher, and the interference frequency usually reaches hundreds of MHz, even GHz. It is these very high frequency interference signals that cause the radiated interference to be increasingly serious, and therefore, a basic requirement for a filter for solving the radiated interference is to be able to attenuate these high frequency interference signals greatly, and the filter with effective filtering frequency ranging from several KHz to GHz is a feed-through filter.

The way in which the feed-through filter is mounted has a great influence on the performance of the filter. First, the feed-through filter must have a metal plate as an isolation plate to isolate the input and output of the filter. Secondly, the filter is required to be in low-impedance contact with the metal plate so as to ensure the bypass effect of the filter capacitor. In order to achieve the low-impedance contact between the filter and the metal plate and achieve the bypass effect of the filter capacitor, it is necessary to ensure that the central screw rod is positioned on the central line of the filter main body and does not deviate.

Currently, there are a large number of feed-through filters on the market with defects. Referring to fig. 2, a prior art filter is assembled inside, and a screw 29 passes through the flat washer 27, the insulator 26, the housing 24, the feedthrough capacitor 23, and the large flat washer 22 in this order. The grounded installation side of the filter, namely the side close to the large nut 25, can ensure that the screw 29 is positioned on the central line by opening a hole with the same diameter as the screw 29 through the insulator 26; however, inside the housing 24, when the nut four 28 and the nut three 21 are tightened, the feedthrough capacitor 23 or the large flat washer 22 is stressed, causing the screw 29 to deflect on the side remote from the large nut 25. When the screw 29 is displaced, high impedance is generated between the filter and the mounting metal plate when the filter is mounted in a grounding mode, the filter cannot achieve the desired bypass filtering effect, the filtering efficiency is affected, and even the filter shell is deformed to damage an internal feedthrough capacitor.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: the problems of increased installation stress, reduced filtering efficiency and the like caused by the deviation of a central screw rod of the conventional feed-through filter from a central line.

In order to solve the technical problem, the technical scheme of the utility model provides a feed-through filter that central screw rod does not squint, including the wave filter main part, the wave filter main part includes the casing, be equipped with feedthrough electric capacity in the casing, be equipped with the electric capacity clamp plate on the feedthrough electric capacity, be equipped with nut one on the electric capacity clamp plate, central screw rod from the top down passes the casing in proper order, nut one, electric capacity clamp plate and feedthrough electric capacity, the central screw rod both ends are located the outside of wave filter main part, it is fixed with the wave filter main part that central screw rod passes through the central screw rod fastener, central screw rod lower extreme is equipped with the insulator and is used for installing the big nut on: and a positioning lining ring is arranged between the capacitor pressing plate and the first nut, the positioning lining ring is sleeved on the central screw rod, a clamping jaw for clamping the through capacitor and the capacitor pressing plate is arranged on one side of the positioning lining ring facing the capacitor pressing plate, the diameter of the circumference of the inner side of the clamping jaw is equal to the outer diameter of the capacitor pressing plate, and the diameter of the circumference of the outer side of the clamping jaw is equal to the inner diameter of the shell.

Preferably, the jaws are annular and are arranged on the circumference of the positioning collar.

Preferably, the number of the jaws is at least three.

Preferably, the jaws are arcuate.

Preferably, the jaws are uniformly distributed on the positioning ring.

Preferably, the outer side of the claw is provided with a chamfer which is convenient for installing and positioning the lining ring.

Preferably, the central screw fastener comprises a second nut, and a flat washer is arranged between the second nut and the filter body.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a location junk ring fixed center screw rod has customized the electric capacity clamp plate. Although the positioning lining rings and the capacitor pressing plates need to be customized, the structure is simple, the cost is low, and the mold can be opened for mass production.

The utility model discloses the size of punching electric capacity, electric capacity clamp plate, location junk ring, central screw rod in wave filter main part casing and the casing mutually supports, has ensured that central screw rod is located not squint on wave filter casing's the central line. On the basis of not improving the production cost and the production efficiency of the filter, on one hand, the large nut and the shell can not generate large stress when the filter is installed, and the feedthrough capacitor in the shell can not be damaged; on the other hand, the contact area between the filter shell and the installation metal plate can be increased, so that the shell and the metal plate are in low-impedance contact, and the bypass effect of the filter capacitor is ensured.

Drawings

Fig. 1 is an external view of the filter of the present invention.

FIG. 2 is a cross-sectional view of the interior of a prior art filter;

figure 3 is an internal cross-sectional view of the filter of the present invention;

fig. 4 is a schematic perspective view of the positioning lining ring of the filter of the present invention.

Detailed Description

In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

As shown in fig. 1 and 3, the present invention relates to a feed-through filter with non-offset central screw, which comprises a filter body, a central screw 9, a central screw fastener, an insulator 6 and a large nut 5 for mounting the filter on a metal plate. The central screw 9 is fixed with the filter body through a central screw fastener, and the central screw fastener is a second nut 8 and a flat washer 7 in the embodiment. The filter main part includes casing 4, and the capacitor 3 that pierces through is established in casing 4, is equipped with electric capacity clamp plate 2 on the capacitor 3 that pierces through, and electric capacity clamp plate 2's external diameter equals the external diameter of capacitor 3 that pierces through, and electric capacity clamp plate 2's internal diameter equals the diameter of central screw rod 9. The capacitor pressing plate 2 is provided with a first nut 1, a positioning lining ring 10 is arranged between the capacitor pressing plate 2 and the first nut 1, the positioning lining ring 10 is sleeved on the central screw rod 9, the positioning lining ring is a plastic part in the embodiment, and the capacitor pressing plate 2 is a metal part. Three clamping claws 101 for clamping the feed-through capacitor 3 and the capacitor pressing plate 2 are processed on one side of the positioning lining ring 10 facing the capacitor pressing plate 2, and the clamping claws 101 are arc-shaped and are uniformly distributed on the positioning lining ring 10. The number of the claws 101 may be more or may be an integral ring shape. The diameter of the circumference of the inner side of the clamping jaw 101 is equal to the outer diameter of the capacitor pressing plate 2, namely, the outer diameter of the feedthrough capacitor 3, the diameter of the circumference of the outer side of the clamping jaw 101 is equal to the inner diameter of the shell 4, and the depth of the clamping jaw 101 is larger than the thickness of the capacitor pressing plate 2, so that the part of the feedthrough capacitor 3 can be wrapped. The outside of the jaws 101 is chamfered to facilitate the mounting of the positioning bushing 10 between the housing 4 and the feedthrough capacitor 3. The screw 9 sequentially penetrates through the shell 4, the first nut 1, the positioning lining ring 10, the capacitance pressing plate 2, the feedthrough capacitor 3, the insulator 6, the flat washer 7 and the second nut 8 from top to bottom. The central screw 9 penetrates through the whole filter body, and the parts of the central screw 9 exposed out of the two ends of the shell 4 are used as input and output to receive input and output electric signals. The two ends of the shell 4 are provided with potting materials, and the potting materials in the embodiment are epoxy resin and are sealed by resin to provide good environmental protection.

After the requirements are met, when the nut II 8 and the nut I1 are tightened, force interaction exists among the screw 9, the capacitor pressing plate 2, the feedthrough capacitor 3, the positioning lining ring 10 and the shell 4, and the central screw 9 can be ensured to be always positioned on the central line of the filter and not to deviate.

Claims

1. The utility model provides a feed-through filter that central screw rod does not squint, including the wave filter main part, the wave filter main part includes casing (4), be equipped with feedthrough electric capacity (3) in casing (4), be equipped with electric capacity clamp plate (2) on feedthrough electric capacity (3), be equipped with nut (1) on electric capacity clamp plate (2), central screw rod (9) from the top down passes casing (4) in proper order, nut (1), electric capacity clamp plate (2) and feedthrough electric capacity (3), central screw rod (9) both ends are located the outside of wave filter main part, central screw rod (9) are fixed with the wave filter main part through central screw rod fastener, central screw rod (9) lower extreme is equipped with insulator (6) and is used for installing big nut (5) on the metal sheet with the wave filter, its characterized: be equipped with location junk ring (10) between electric capacity clamp plate (2) and nut (1), location junk ring (10) cover is on central screw rod (9), and one side of location junk ring (10) towards electric capacity clamp plate (2) is equipped with jack catch (101) that are used for blocking through electric capacity (3) and electric capacity clamp plate (2), and the diameter of jack catch (101) inboard place circumference equals the external diameter of electric capacity clamp plate (2), and the diameter of jack catch (101) outside place circumference equals the internal diameter of casing (4).

2. A feedthrough filter having a center screw that is not offset as defined in claim 1, wherein: the claws (101) are annular and are arranged on the circumference of the positioning lining ring (10).

3. A feedthrough filter having a center screw that is not offset as defined in claim 1, wherein: the number of the claws (101) is at least three.

4. A feedthrough filter having a center screw that is not offset as defined in claim 3, wherein: the clamping jaw (101) is arc-shaped.

5. A feedthrough filter having a center screw that is not offset as defined in claim 3, wherein: the claws (101) are uniformly distributed on the positioning lining ring (10).

6. A feedthrough filter having a center screw that is not offset as defined in claim 1, wherein: and chamfers convenient for mounting and positioning the lining rings (10) are arranged on the outer sides of the claws (101).

7. A feedthrough filter having a center screw that is not offset as defined in claim 1, wherein: the central screw fastener comprises a second nut (8), and a flat washer (7) is arranged between the second nut (8) and the filter main body.