Feed-through filter structure

Abstract

The utility model discloses a feed-through filter structure, comprising a screw rod which extends along an axial direction; the magnetic core is arranged on the screw rod in a sleeving manner; the feed-through capacitor is arranged on the screw rod in a sleeving manner, and the feed-through capacitor is arranged on one side of the magnetic core; the shell is used for accommodating the magnetic core, the feed-through capacitor and at least part of the screw rod; wherein the shell comprises a first shell body and a second shell body, the first shell body is mechanically connected with the second shell body, and the connecting position of the first shell body and the second shell body is arranged at the magnetic core in the axial direction. According to the structure of the utility model, rapid assembly can be realized and the processing efficiency can be improved through the housing designed by split mechanical connection and by means of the characteristic that the magnetic core has low requirement on the sealing performance.

Description

Technical Field

[0001] The utility model relates to a filter, in particular to a feed-through filter structure. Background Art

[0002] The description in this section merely provides background information related to the disclosure of the present utility model and does not constitute prior art.

[0003] A filter is a component or device in an electronic circuit that allows signals in a specific frequency range to pass through while blocking signals in other frequency ranges. Filters can be divided into low-pass, high-pass, band-pass and band-stop filters. The above filters are widely used in various electronic devices, such as signal processing in communication systems and sound equalization in audio systems. Among them, the feedthrough filter is a special type of filter, which is usually used for EMI (electromagnetic interference) filtering of power lines or signal lines. The characteristic of the feedthrough filter is that it is directly installed on the line that needs to be filtered, allowing direct current or signals to pass through while blocking high-frequency noise. The design of the feedthrough filter usually contains capacitors and inductor components, which can provide a low impedance path at high frequencies, so that high-frequency noise is effectively attenuated. It has the characteristics of excellent performance and compactness.

[0004] However, due to the small size of the feed-through filter, the components inside the feed-through filter are arranged very tightly, so it takes very skilled workers to spend a lot of time to assemble it. In addition, existing feed-through filters generally require welding operations on the shell, and multiple welding operations are required during assembly, which increases the assembly time and also increases the risk of capacitor failure during the welding process. At the same time, welding and other connection methods require positioning of the feed-through filter shell, and additional fixture costs are required.

[0005] Currently, there is no feedthrough filter structure that can solve the above problems. Utility Model Content

[0006] The utility model aims to provide a feed-through filter structure, which can realize rapid assembly and improve processing efficiency by means of a housing designed with split mechanical connection and low sealing performance requirements at the magnetic core.

[0007] In order to achieve the above object, the utility model discloses the following feed-through filter structure; the feed-through filter structure comprises:

[0008] A screw rod extending in an axial direction;

[0009] A magnetic core, wherein the magnetic core is sleeved on the screw;

[0010] A through-hole capacitor, wherein the through-hole capacitor is sleeved on the screw rod and is arranged on one side of the magnetic core;

[0011] A housing, the housing being used to accommodate the magnetic core, the through-hole capacitor and at least a portion of the screw;

[0012] The housing includes a first shell and a second shell, the first shell is mechanically connected to the second shell, and the connection position between the first shell and the second shell is arranged at the magnetic core along the axial direction.

[0013] Furthermore, it also includes a gasket, which is sleeved on the screw rod and arranged between the magnetic core and the through-hole capacitor, and the through-hole capacitor is electrically connected to the screw rod through the gasket.

[0014] Further, one end of the first shell has an internal thread, and one end of the second shell has an external thread matching the internal thread, so that the first shell and the second shell are threadedly connected.

[0015] Furthermore, a cavity is provided inside the first shell and the second shell after mechanical connection, and the cavity is used to accommodate the magnetic core and the through-hole capacitor.

[0016] Furthermore, the number of the through-hole capacitors is two, and the two through-hole capacitors are respectively arranged at two ends of the magnetic core along the axial direction.

[0017] Furthermore, it also includes a terminal, which is sleeved on the screw rod and arranged on a side of the through-hole capacitor away from the magnetic core along the axial direction, and at least part of the terminal extends to the outside of the shell along the axial direction.

[0018] Furthermore, the number of the terminals is two, and the two terminals are respectively arranged at two ends of the housing along the axial direction.

[0019] Furthermore, the housing has glue potting at the position of each of the terminals, so that the housing is sealed by the glue potting on one side of each of the terminals.

[0020] Furthermore, the housing has a radially extending limiting portion at the position of each terminal in the direction of the capacitor to limit the movement of the capacitor relative to the housing.

[0021] By means of the above technical solution, the beneficial effects of the utility model are as follows:

[0022] The feed-through filter structure of the utility model can be composed of a first shell and a second shell by means of a split-type mechanical connection design. The opposite ends of the first shell and the second shell can be detachably combined together by means of a mechanical connection. In the process of installing the feed-through filter structure of the utility model, it is only necessary to insert the magnetic core, the through-core capacitor, etc. on the screw rod, and then directly put on the first shell and the second shell to achieve complete fixation. The mechanical connection between the first shell and the second shell is set at the magnetic core, and the sealing requirement is relatively low. On the basis of meeting the requirement of quick installation, the requirements of electrical performance can be effectively met. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 is a cross-sectional view of a feed-through filter structure provided in an embodiment of this specification;

[0025] Figure 2 is a side view of a feedthrough filter structure provided in an embodiment of this specification;

[0026] In the figure: 1, screw; 2, magnetic core; 3, through-hole capacitor; 4, shell; 41, first shell; 42, second shell; 43, limit part; 5, gasket; 6, terminal. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0028] In the description of the present utility model, it should be noted that the terms "upper", "middle", "lower", "inner", "outer", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. The terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The following describes the implementation method of the present utility model based on its overall structure.

[0029] See also Figure 1-2 , is a feedthrough filter structure of this embodiment; wherein the feedthrough filter structure includes:

[0030] Screw 1, screw 1 extends in the axial direction;

[0031] A magnetic core 2, wherein the magnetic core 2 is sleeved on the screw 1;

[0032] A through-hole capacitor 3 is sleeved on the screw rod 1, and the through-hole capacitor 3 is arranged on one side of the magnetic core 2;

[0033] A housing 4, the housing 4 is used to accommodate the magnetic core 2, the through-hole capacitor 3 and at least a part of the screw 1;

[0034] The housing 4 includes a first shell 41 and a second shell 42 . The first shell 41 and the second shell 42 are mechanically connected, and the connection position between the first shell 41 and the second shell 42 is set at the magnetic core 2 along the axial direction.

[0035] Through the above structure, during installation, the operator only needs to prepare a screw rod 1 of a preset size, and sleeve the magnetic core 2 on the screw rod 1 along one end of the screw rod 1, and push the magnetic core 2 to slide along the screw rod 1 until the magnetic core 2 is placed at a preset position; after the magnetic core 2 is sleeved, the operator picks up the through-core capacitor 3 and sleeves it on the screw rod 1 in the same manner, and pushes the magnetic core 2 to slide along the screw rod 1 until the through-core capacitor 3 is placed on one side of the magnetic core 2 and is close to the magnetic core 2. After the through-hole capacitor 3 is installed, the operator picks up the first shell 41 and the second shell 42 in the shell 4 respectively, and installs the first shell 41 along the designated one side along the axial direction to cover part of the magnetic core 2 and the through-hole capacitor 3, and installs the first shell 41 along the designated other side along the axial direction to cover the remaining part of the magnetic core 2 and the through-hole capacitor 3. At this time, the first shell 41 is partially in contact with the second shell 42, and then the operator performs alignment installation through the preset mechanical structure on the first shell 41 and the second shell 42, so that the first shell 41 and the second shell 42 are mechanically connected and tightly buckled together to achieve a certain degree of sealing effect. At this time, the magnetic core 2, the through-hole capacitor 3 and part of the screw 1 are covered and accommodated by the first shell 4 and the second shell 42 of the shell 4.

[0036] In the above installation process, since the connection position between the first shell 41 and the second shell 42 of the shell 4 is set at the position of the magnetic core 2 in the axial direction, generally speaking, in the feed-through filter, the sealing effect at the magnetic core 2 can meet the basic requirements. Therefore, in this embodiment, the mechanical connection between the first shell 41 and the second shell 42 at the magnetic core 2 can obviously be sealed through the mechanical connection, and the interior of the magnetic core 2 is in a sealing effect that meets the expectations.

[0037] Similarly, since the first shell 41 and the second shell 42 of the shell 4 are mechanically connected at the magnetic core 2 sections at the relatively middle position, that is, the shell 4 adopts an integrated seamless shell structure design at the two ends of the feed-through filter structure along the axial direction, the sealing performance is better, and there is no need for the operator to perform welding and other treatments. It is only necessary to perform glue sealing on the important nodes at both ends of the first shell 41 and the second shell 42 after installing the first shell 41 and the second shell 42, respectively, to achieve a better sealing effect. The sealing requirements and structural strength requirements of the end point structure of the general feed-through filter structure are higher. Therefore, in this embodiment, the shell 4 is split into the first shell 41 and the second shell 42, and assembled at the middle position, which is not only easier to assemble, but also does not need to undergo additional large amounts of sealing connection treatments at both ends of the shell 4. The structural strength at both ends of the shell 4 is also strong enough, and the sealing effect is better than that of the traditional feed-through filter structure that needs to be spliced ​​and installed at both ends of the shell 4 along the axial direction, achieving the effect of killing two birds with one stone.

[0038] At the same time, it is worth noting that compared with the traditional shell structure, a complete shell body is generally provided. After the shell body is set, welding or sealing is performed from both ends of the shell. Generally, a specific clamp is required to clamp the shell 4 during welding and installation. In the present embodiment, since the shell 4 is composed of a first shell 41 and a second shell 42 that are mechanically connected and can be manually detached, there is no need to weld the two ends of the shell 4. The operator only needs to pick up the first shell 41 and the second shell 42 respectively, and then manually rotate or press the first shell 41 and the second shell 42 to each other and splice them together. During the splicing process, the magnetic core 2, the through-hole capacitor 3, etc. inside the shell 4 are automatically positioned, and can obviously be combined into a complete feed-through filter structure, and no external fixture is required for fixing, which significantly saves program costs and improves installation efficiency.

[0039] Furthermore, if Figure 1 As shown, it also includes a gasket 5, which is sleeved on the screw 1, and the gasket 5 is arranged between the magnetic core 2 and the through-hole capacitor 3, and the through-hole capacitor 3 is electrically connected to the screw 1 through the gasket 5. The gasket 5 is set as a ring extending in the radial direction, and its main function is to achieve the electrical connection between the through-hole capacitor 3 and the screw 1. At the same time, the gasket 5 can also provide mechanical support to achieve the positioning of the through-hole capacitor 3, and can also form a certain buffer and shock absorption space between the magnetic core 2 and the through-hole capacitor 3.

[0040] Further, one end of the first shell 41 has an internal thread, and one end of the second shell 42 has an external thread matching the internal thread, so that the first shell 41 and the second shell 42 are threadedly connected. The threaded connector is highly standardized and has a self-locking characteristic. When the feed-through filter structure is subjected to vibration and impact, it can remain in a fastened state, which is convenient for production and use. At the same time, the shell 4 in this embodiment is generally set as a cylindrical structure, which is convenient for the operator to hold and rotate. The mechanical combination of threaded connection can significantly improve the installation efficiency. At the same time, the first shell 41 and the second shell 42 after mechanical connection have a cavity inside, and the cavity is used to accommodate the magnetic core 2 and the through-core capacitor 3. Since the main part of the shell 4 is set as a cylinder, the cavity is also set as a corresponding cylindrical space. In the process of threaded connection between the first shell 41 and the second shell 42, the magnetic core 2 and the through-core capacitor 3 inside the cavity will be limited by the inner wall of the cavity during the process of resetting the cavity until they are completely reset and the installation is completed. Positioning and calibration are achieved in the process of installing the shell 4.

[0041] Furthermore, in the present embodiment, the number of through-hole capacitors 3 is two, and the two through-hole capacitors 3 are respectively arranged at the two ends of the magnetic core 2 in the axial direction. At the same time, it also includes a terminal 6, which is sleeved on the screw 1, and the terminal 6 is arranged on the side of the through-hole capacitor 3 away from the magnetic core 2 in the axial direction, and at least part of the terminal 6 extends to the outside of the shell 4 in the axial direction, and the number of terminals 6 is two, and the two terminals 6 are respectively arranged at the two ends of the shell 4 in the axial direction. Specifically, a through-hole capacitor 3 is respectively arranged in front and behind the magnetic core 2, and is directly connected to the outside through the front and rear terminals 6, so as to form a more effective filtering network, the front through-hole capacitor 3 is responsible for bypassing the high-frequency interference entering the circuit, and the magnetic core 2 further attenuates the remaining high-frequency signal, while the rear through-hole capacitor 3 is responsible for bypassing the high-frequency signal that still exists after passing through the magnetic core 2, providing a stronger high-frequency filtering effect, with the purpose of providing a stronger high-frequency interference suppression capability. The feedthrough filter structure of the present embodiment is mainly used in medical equipment, and the requirements for filtering effect can be met.

[0042] Furthermore, after the first shell 41 and the second shell 42 of the shell 4 are threadedly connected, the shell 4 has glue filling at the position of each terminal 6, so that the shell 4 is sealed by glue filling at one side of each terminal 6. Specifically, in this embodiment, since the magnetic core 2 in the middle part of the shell 4 is assembled by threaded connection, and the sealing at the magnetic core 2 has met the basic requirements, it is only necessary to fill the terminals 6 at both ends of the shell 4 with glue toward the middle position to meet the further fixing operation of the terminals 6, the through-hole capacitor 3, etc., and achieve a stabilizing effect.

[0043] Furthermore, if Figure 1 As shown, the housing 4 has a radially extending limiter 43 at each terminal 6 in the direction of the capacitor 3 to limit the movement of the capacitor 3 relative to the housing 4. Among them, one side of the first housing 41 and the second housing 42 has a limiter 43 for isolating and limiting the through-hole capacitor 3, so that after the first housing 41 and the second housing 42 of the housing 4 are threadedly connected, the two limiters 43 just limit the two through-hole capacitors 3 at the front and rear of the housing 4 to the specified positions, so that the preliminary fixation of the through-hole capacitor 3 is completed, which can facilitate the subsequent glue filling operation and save glue.

[0044] Although different specific embodiments are mentioned in the content of this application, this application is not limited to the situations described in the industry standards or embodiments, etc. Some industry standards or slightly modified implementation plans based on the implementation of the custom methods or embodiments can also achieve the same, equivalent or similar, or predictable implementation effects after deformation of the above embodiments. The embodiments of data acquisition, processing, output, judgment methods, etc. after these modifications or deformations can still fall within the scope of the optional implementation plans of this application.

[0045] Although the present application has been described through embodiments, those skilled in the art will appreciate that there are many modifications and changes to the present application without departing from the spirit of the present application. It is intended that the attached embodiments include these modifications and changes without departing from the present application.

Claims

1. A feedthrough filter structure; characterized in that, The feedthrough filter structure comprises: A screw rod extending in an axial direction; A magnetic core, wherein the magnetic core is sleeved on the screw; A through-hole capacitor, wherein the through-hole capacitor is sleeved on the screw rod and is arranged on one side of the magnetic core; A housing, the housing being used to accommodate the magnetic core, the through-hole capacitor and at least a portion of the screw; The housing includes a first shell and a second shell, the first shell is mechanically connected to the second shell, and the connection position between the first shell and the second shell is arranged at the magnetic core along the axial direction.

2. The feedthrough filter structure according to claim 1, characterized in that: It also includes a gasket, which is sleeved on the screw rod and arranged between the magnetic core and the through-hole capacitor. The through-hole capacitor is electrically connected to the screw rod through the gasket.

3. The feedthrough filter structure according to claim 1, characterized in that: One end of the first shell has an internal thread, and one end of the second shell has an external thread matching the internal thread, so that the first shell and the second shell are threadedly connected.

4. The feedthrough filter structure according to claim 1, characterized in that: The first shell and the second shell after mechanical connection have a cavity inside, and the cavity is used to accommodate the magnetic core and the through-hole capacitor.

5. The feedthrough filter structure according to claim 1, characterized in that: The number of the through-hole capacitors is two, and the two through-hole capacitors are respectively arranged at two ends of the magnetic core along the axial direction.

6. The feedthrough filter structure according to claim 5, characterized in that: It also includes a terminal, which is sleeved on the screw rod and arranged on a side of the through-hole capacitor away from the magnetic core along the axial direction, and at least part of the terminal extends to the outside of the shell along the axial direction.

7. The feedthrough filter structure according to claim 6, characterized in that: The number of the terminals is two, and the two terminals are respectively arranged at two ends of the housing along the axial direction.

8. The feedthrough filter structure according to claim 7, characterized in that: The housing has potting glue at the position of each of the terminals, so that the housing is sealed by the potting glue on one side of each of the terminals.

9. The feedthrough filter structure according to claim 7, characterized in that: The housing has a radially extending limiting portion at the position of each terminal in the direction of the capacitor to limit the movement of the capacitor relative to the housing.

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