Electromagnetic shield type wire harness seal plug for vacuum pump motor

Abstract

This utility model relates to an electromagnetic shielding type wire harness sealing plug for a vacuum pump motor. It is installed at the outlet hole of the vacuum pump motor housing and includes a conductive silicone rubber wire harness plug. A receiving hole is provided through one side of the conductive silicone rubber wire harness plug for the connecting wire harness of the vacuum pump motor to pass through, forming a distributed capacitance between the connecting wire harness and the conductive silicone rubber wire harness plug. The conductive silicone rubber wire harness plug is press-fitted into the outlet hole of the vacuum pump motor housing, allowing an electromagnetic shielding grounding circuit to be formed between the conductive silicone rubber wire harness plug and the vacuum pump motor housing. In this electromagnetic shielding type wire harness sealing plug for a vacuum pump motor, the outer plate of the conductive silicone rubber wire harness plug directly conductively contacts the paint-removed portion on the outside of the vacuum pump motor housing, while its inner plate directly conductively contacts the inner surface of the vacuum pump motor housing, allowing an electromagnetic shielding grounding circuit to be formed between the conductive silicone rubber wire harness plug and the vacuum pump motor housing.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump motor technology, specifically to an electromagnetically shielded wire harness sealing plug for vacuum pump motors. Background Technology

[0002] In the design and application of vacuum pump motors, ensuring their internal airtightness is crucial. Therefore, it is usually necessary to install a wire harness sealing plug at the wire outlet of the motor housing to prevent air leakage during operation. Traditional technology commonly uses wire harness plugs made of NBR (nitrile rubber). This insulating elastomer material can provide good physical sealing performance. Through the interference fit with the wire outlet of the housing, it effectively isolates the external environment from the motor interior, ensuring the stability and reliability of the vacuum pump operation.

[0003] However, with increasingly stringent electromagnetic compatibility (EMC) standards for electrical and electronic equipment, this traditional design has revealed significant technical flaws. When a vacuum pump motor is in operation, the processes of brush commutation and rapid switching of winding current generate high-frequency electromagnetic interference, especially common-mode interference. These interference currents are conducted along the internal wiring harness of the motor to the outlet holes of the housing. Since NBR material is an excellent insulator with extremely high volume resistivity, it cannot provide a low-impedance grounding path for these high-frequency interference currents. As a result, the motor often experiences problems such as excessive radiated emissions (REs) or failure of immunity tests during EMC testing.

[0004] To compensate for this deficiency, existing technical solutions often adopt patchwork remedial measures, such as adding an extra shielding layer and shielding connector to the connecting wire harness; installing an independent metal shielding cover on the outside of the motor; or performing complex conductive spraying treatment on the entire motor. Although these methods can theoretically improve EMC performance, they undoubtedly increase the material cost of the motor, the complexity of production and assembly, and the overall size and weight. Therefore, an electromagnetic shielding type wire harness sealing plug for vacuum pump motors is proposed. Summary of the Invention

[0005] Based on the above description, this utility model provides an electromagnetically shielded wire harness sealing plug for a vacuum pump motor, which solves the technical problems pointed out in the background art.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: An electromagnetic shielding type wire harness sealing plug for a vacuum pump motor, disposed at the wire outlet hole of the vacuum pump motor housing, comprising: The conductive silicone rubber wire harness plug has a through-hole on one side for the connecting wire harness of the vacuum pump motor body to pass through, so that a distributed capacitance is formed between the connecting wire harness and the conductive silicone rubber wire harness plug. The conductive silicone rubber wire harness plug is pressed into the outlet hole of the vacuum pump motor body housing, so that an electromagnetic shielding grounding circuit can be formed between the conductive silicone rubber wire harness plug and the vacuum pump motor body.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the conductive silicone rubber wire harness plug includes an outer plate, an adapter, and an inner plate. The adapter is adapted to the wire outlet hole, and the outer plate and the inner plate are disposed on both sides of the adapter.

[0009] Furthermore, the outer plate is disposed on the outside of the vacuum pump motor housing, allowing the outer plate to directly conduct electricity with the vacuum pump motor housing, and the inner plate is disposed on the inside of the vacuum pump motor housing, allowing the inner plate to directly conduct electricity with the inner surface of the vacuum pump motor housing.

[0010] Furthermore, the length and height of the outer plate and inner plate are greater than the length and width of the adapter, respectively, and the thickness of the adapter is equal to the width of the outlet hole, so that the conductive silicone rubber wire harness plug can be fitted into the outlet hole.

[0011] Furthermore, it also includes a wire support structure, which is detachably installed on the outside of the outer panel to support the connecting wire harness of the vacuum pump motor body, so that the connecting wire harness of the vacuum pump motor body is not excessively bent.

[0012] Furthermore, two sets of slots are provided on the outer side of the outer panel, and the cable tray structure is detachably connected to the outer panel through the slots.

[0013] Furthermore, the card slot consists of a lifting slide and two sets of card chambers, with the card chambers located on both sides of the top of the lifting slide.

[0014] Furthermore, the cable tray structure includes a cable tray plate, which consists of a horizontal platform and an inclined section. A support platform for accommodating the connecting cable bundle is provided on the horizontal platform. Slider blocks that are slidably connected to the lifting slide are fixed on both sides of the cable tray plate by extension strips. Two sets of clips that can be bent inwards are provided on the sliders. The clips have clip blocks that are adapted to the clip slots, allowing the cable tray structure to be detachably connected to the outer plate section through the clip slots.

[0015] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: This electromagnetic shielding wire harness sealing plug for vacuum pump motors, through its structural design, allows the outer plate of the conductive silicone rubber wire harness plug to make direct conductive contact with the paint-removed portion on the outside of the vacuum pump motor housing, while its inner plate makes direct conductive contact with the inner surface of the vacuum pump motor housing. After installation, this allows an electromagnetic shielding grounding loop to be formed between the conductive silicone rubber wire harness plug and the vacuum pump motor housing, significantly improving the shielding effectiveness. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an electromagnetic shielding wire harness sealing plug for a vacuum pump motor provided in Embodiment 1 of this utility model; Figure 2 for Figure 1 A partial structural diagram of the structure installed behind the vacuum pump motor; Figure 3 This is a schematic diagram of the structure of the adapter in an embodiment of the present utility model; Figure 4 for Figure 1 A schematic diagram of the structure installed behind the carbon brush cover assembly; Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 6 for Figure 5 A cross-sectional view; Figure 7 for Figure 5 A schematic diagram of the structure of the middle support frame.

[0017] The attached diagram lists the components represented by each number as follows: 1. Vacuum pump motor body; 11. Connecting wire harness; 12. Housing; 13. Front cover; 2. Conductive silicone rubber wire harness plug; 21. Receiving hole; 22. Outer plate; 23. Adapter; 24. Inner plate; 25. Slot; 3. Wire support structure; 31. Wire support plate; 32. Support platform; 33. Slider; 34. Clip. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Example 1

[0019] like Figure 1-4As shown in this embodiment, an electromagnetic shielding wire harness sealing plug for a vacuum pump motor is disposed at the outlet hole of the vacuum pump motor body 1 housing. It is used to provide a grounding path for the interference circuit at the outlet hole to form electromagnetic shielding. It should be noted that the vacuum pump motor body 1 housing itself has a grounding setting. Therefore, the electromagnetic shielding wire harness sealing plug for a vacuum pump motor utilizes the grounding setting of the vacuum pump motor body 1 housing itself. Through this electromagnetic shielding wire harness sealing plug for a vacuum pump motor, the electromagnetic shielding wire harness sealing plug for a vacuum pump motor can form an electromagnetic shielding grounding circuit with the vacuum pump motor body 1 housing.

[0020] The electromagnetic shielding type wire harness sealing plug for a vacuum pump motor includes a conductive silicone rubber wire harness plug 2, and a receiving hole 21 is provided through one side of the conductive silicone rubber wire harness plug 2 for the connecting wire harness 11 of the vacuum pump motor body 1 to pass through, so that a distributed capacitance is formed between the connecting wire harness 11 and the conductive silicone rubber wire harness plug 2. The conductive silicone rubber wire harness plug 2 is pressed into the wire outlet hole of the housing of the vacuum pump motor body 1, so that an electromagnetic shielding grounding circuit can be formed between the conductive silicone rubber wire harness plug 2 and the vacuum pump motor body 1.

[0021] The following is an explanation of how the conductive silicone rubber wire harness plug 2 is press-fitted into the outlet hole of the vacuum pump motor housing 1: Figure 5 As shown, the vacuum pump motor body 1 housing includes a housing 12 and a front cover 13, and has a wire outlet hole. The conductive silicone rubber wire harness plug 2 is located at this wire outlet hole. When the front cover 13 is fixed by bolts, the front cover 13 presses down on the conductive silicone rubber wire harness plug 2, so that the conductive silicone rubber wire harness plug 2 is pressed into the wire outlet hole.

[0022] Further explanation: In this embodiment, the conductive silicone rubber wire harness plug 2 includes an outer plate portion 22, an adapter portion 23, and an inner plate portion 24. The adapter portion 23 is adapted to the wire outlet hole. The outer plate portion 22 and the inner plate portion 24 are disposed on both sides of the adapter portion 23. At this time, the outer plate portion 22 is in contact with the outer side of the vacuum pump motor body 1 housing. It should be noted that, in practice, the part of the outer side of the vacuum pump motor body 1 housing that contacts the outer plate portion 22 needs to be de-painted to allow the outer plate portion 22 to make direct conductive contact with the vacuum pump motor body 1 housing. The inner plate portion 24 is in contact with the inner side of the vacuum pump motor body 1 housing. Similarly, it should be noted that the part of the inner side of the vacuum pump motor body 1 housing that contacts the inner plate portion 24 also needs to be de-painted to allow the inner plate portion 24 to make direct conductive contact with the inner surface of the vacuum pump motor body 1 housing, thereby forming a complete electromagnetic shielding circuit.

[0023] Additionally, it should be noted that the length and height of the outer plate portion 22 and the inner plate portion 24 are greater than the length and width of the adapter portion 23, respectively. That is, the length and height of the outer plate portion 22 and the inner plate portion 24 are both greater than the length and width of the hole, so as to achieve sealing of the wire outlet hole. Furthermore, the thickness of the adapter portion 23 is equal to the width of the wire outlet hole, so that the conductive silicone rubber wire harness plug 2 can be snapped into the wire outlet hole. Example 2

[0024] To prevent excessive bending of the connecting harness 11 during use, based on Embodiment 1, such as Figure 5-7 As shown, the electromagnetic shielding type wire harness sealing plug for vacuum pump motor also includes a wire support structure 3. The wire support structure 3 is detachably disposed on the outside of the outer plate 22 to support the connecting wire harness 11 of the vacuum pump motor body 1, so that the connecting wire harness 11 of the vacuum pump motor body 1 can be prevented from being excessively bent.

[0025] To further explain, two sets of slots 25 are provided on the outer side of the outer panel 22. The cable tray structure 3 is detachably connected to the outer panel 22 through the slots 25. The slots 25 consist of a lifting slide and two sets of slot chambers, which are located on both sides of the top of the lifting slide.

[0026] In addition, the cable tray structure 3 includes a cable tray 31, which consists of a horizontal platform and an inclined section. The angle between the horizontal platform and the inclined section is, for example, 135 degrees. It is understood that the angle between the two can also be 150 degrees, as long as the connecting cable harness 11 is not allowed to swing excessively when it is used. A support platform 32 for accommodating the connecting cable harness 11 is provided on the horizontal platform. The two sides of the cable tray 31 are fixed with sliders 33 that are slidably connected in the lifting slide through the extension strip. Two sets of clips 34 that can be bent inwards are provided on the sliders 33. The clips 34 have clips that are adapted to the slots 25, so that the cable tray structure 3 can be detachably connected to the outer plate section 22 through the slots 25.

[0027] With this design, the cable tray structure 3 is fixed to the outside of the outer panel 22 by a snap-fit ​​method. Its support platform 32 can provide effective support for the connecting cable harness 11 after the cable exits, preventing it from bending or swinging excessively in a vibration environment, so as to avoid cable harness damage or loosening of connection points caused by stress concentration, and improve the overall durability of the product.

[0028] The following is an explanation of the electromagnetic shielding type wire harness sealing plug used in vacuum pump motors: During installation, the red and black wires of the connecting harness 11 are threaded through the receiving hole 21, such as... Figure 4 As shown, the wire harness 11 is soldered to the carbon brush cover assembly. Subsequently, as... Figure 2As shown, the electromagnetic shielded wire harness sealing plug for a vacuum pump motor is pressed into the opening of the housing 12 along with the carbon brush cover assembly. The front cover 13 is then installed on the housing 12 to compress the plug and form a seal. During operation, high-frequency noise such as common-mode interference generated inside the motor is coupled to the electromagnetic shielded wire harness sealing plug for the vacuum pump motor via the connecting wire harness 11, and then introduced into the housing of the vacuum pump motor 1 and grounded, which greatly attenuates the outward propagation of interference, thereby enabling the vacuum pump motor to pass the EMC test smoothly.

[0029] The wire core of the connecting harness 11 is separated from the conductive silicone rubber harness plug 2 that wraps it by the insulating sheath of the connecting harness 11, forming a natural "distributed capacitance". For high-frequency interference signals, the impedance of this capacitance is very low. The high-frequency interference voltage is effectively coupled to the conductive silicone rubber harness plug 2 in the form of displacement current through this distributed capacitance. The conductive silicone rubber harness plug 2 flows rapidly into the vacuum pump motor body 1 housing through its contact surface with the vacuum pump motor body 1 housing. Finally, the interference current is conducted to the ground through the housing 12, realizing electromagnetic shielding interference.

[0030] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. An electromagnetically shielded wire harness sealing plug for a vacuum pump motor, disposed at the wire outlet hole of the housing (1) of the vacuum pump motor, characterized in that, include: The conductive silicone rubber wire harness plug (2) has a receiving hole (21) through one side for the connecting wire harness (11) of the vacuum pump motor body (1) to pass through, so that a distributed capacitance is formed between the connecting wire harness (11) and the conductive silicone rubber wire harness plug (2). The conductive silicone rubber wire harness plug (2) is pressed into the outlet hole of the housing of the vacuum pump motor body (1), so that an electromagnetic shielding grounding circuit can be formed between the conductive silicone rubber wire harness plug (2) and the vacuum pump motor body (1).

2. The electromagnetic shielding type wire harness sealing plug for a vacuum pump motor according to claim 1, characterized in that: The conductive silicone rubber wire harness plug (2) includes an outer plate (22), an adapter (23) and an inner plate (24). The adapter (23) is adapted to the wire outlet hole, and the outer plate (22) and the inner plate (24) are disposed on both sides of the adapter (23).

3. The electromagnetic shielding type wire harness sealing plug for a vacuum pump motor according to claim 2, characterized in that: The outer plate (22) is disposed on the outside of the housing of the vacuum pump motor body (1), so that the outer plate (22) is in direct conductive contact with the housing of the vacuum pump motor body (1), and the inner plate (24) is disposed on the inside of the housing of the vacuum pump motor body (1), so that the inner plate (24) is in direct conductive contact with the inner surface of the housing of the vacuum pump motor body (1).

4. The electromagnetic shielding type wire harness sealing plug for a vacuum pump motor according to claim 3, characterized in that: The length and height of the outer plate (22) and inner plate (24) are greater than the length and width of the adapter (23), respectively. The thickness of the adapter (23) is equal to the width of the wire outlet hole, so that the conductive silicone rubber wire harness plug (2) can be fitted into the wire outlet hole.

5. An electromagnetically shielded wire harness sealing plug for a vacuum pump motor according to any one of claims 1-4, characterized in that: It also includes a wire support structure (3), which is detachably installed on the outside of the outer plate (22) to support the connecting wire harness (11) of the vacuum pump motor body (1) so that the connecting wire harness (11) of the vacuum pump motor body (1) is not excessively bent.

6. The electromagnetic shielding type wire harness sealing plug for a vacuum pump motor according to claim 5, characterized in that: Two sets of slots (25) are provided on the outer side of the outer plate (22), and the cable tray structure (3) is detachably connected to the outer plate (22) through the slots (25).

7. The electromagnetic shielding type wire harness sealing plug for a vacuum pump motor according to claim 6, characterized in that: The card slot (25) consists of a lifting slide and two sets of card chambers, with the card chambers located on both sides of the top of the lifting slide.

8. The electromagnetic shielding type wire harness sealing plug for a vacuum pump motor according to claim 7, characterized in that: The cable tray structure (3) includes a cable tray plate (31), which is composed of a horizontal platform and an inclined section. A support platform (32) for accommodating the connecting wire harness (11) is provided on the horizontal platform. The two sides of the cable tray plate (31) are fixed with sliders (33) that are slidably connected in the lifting slide through extension strips. Two sets of clips (34) that can be bent inwards are provided on the sliders (33). The clips (34) have clips that are adapted to the slots (25), so that the cable tray structure (3) can be detachably connected to the outer plate section (22) through the slots (25).

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