PTC heater wire harness whip seal structure

Abstract

The utility model discloses a PTC heater wire harness flails line type sealing structure. It includes high pressure connector, high pressure wire harness and be used for installing fixed casing, and one end of high pressure wire harness is connected with high pressure connector electricity, still include the silica gel sealing washer for sealing waterproof and be used for the plastic fixing spare of pressure tight fixed, and the other end of high pressure wire harness passes through silica gel sealing washer and plastic fixing spare in proper order and is fixedly connected with plastic fixing spare, the part of high pressure wire harness that goes out is fixed in the casing through plastic fixing spare and is sealed through silica gel sealing washer pressure tight. Advantage is: through introducing plastic fixing spare and sealing groove structure, and in the sealing groove pours two components sealant, makes plastic fixing spare and silica gel sealing washer form integrated close -fitting waterproof interface after solidification, blocks the passageway of water vapor along high pressure wire harness wire core infiltration from structure, significantly improves the sealing performance, can satisfy the protection level requirement of IP67&IP6K9K effectively.

Description

Technical Field

[0001] This utility model relates to the application field of PTC heaters for new energy vehicles, and in particular to a PTC heater lead wire harness PTC heater wire harness spin-type sealing structure. Background Technology

[0002] Existing PTC heaters in electric vehicles are mainly integrated into the heating core circuit for passenger compartment heating and battery pack preheating at low temperatures. Due to the limitations of the vehicle's overall layout, some PTC heater leads need to adopt a stranded wire structure. However, this structure requires sealing the PTC heater leads, completely sealing the stranded part to the heater's interior with silicone gaskets. This prevents condensation or cooling water caused by environmental factors in extreme areas and operating conditions from flowing through the wiring harness into the PTC heater, leading to poor insulation and causing the vehicle to malfunction and become inoperable. However, currently, sealing the wiring harness solely with silicone gaskets cannot completely prevent moisture from seeping into the wire core and entering the core, causing insulation failure. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a PTC heater wire harness spin-type sealing structure that can reduce the overall sealing failure rate, improve the sealing effect, and enhance the insulation performance.

[0004] To solve the above-mentioned technical problems, the PTC heater wiring harness spin-out sealing structure of this utility model includes a high-voltage connector, a high-voltage wiring harness, and a housing for installation and fixing. One end of the high-voltage wiring harness is electrically connected to the high-voltage connector. It also includes a silicone sealing gasket for sealing and waterproofing and a plastic fixing component for pressing and fixing. The other end of the high-voltage wiring harness passes through the silicone sealing gasket and the plastic fixing component in sequence and is fixedly connected to the plastic fixing component. The protruding part of the high-voltage wiring harness is fixed in the housing by the plastic fixing component and pressed and sealed by the silicone sealing gasket.

[0005] The sealing surface of the silicone sealing gasket is attached to the plastic fastener. The silicone sealing gasket has a through hole for passing through the high-voltage wire harness. A closed sealing groove is provided around the sealing surface outside the through hole, and the sealing groove is filled with sealant.

[0006] The number of through holes is two.

[0007] The outer surface of the silicone sealing gasket is provided with several annular sealing ribs for interference fit with the inner cavity of the housing.

[0008] The sealing ribs are spaced 3mm apart.

[0009] The plastic fastener has a metal shielding ring inside its cavity that is fitted onto the high-voltage wire harness.

[0010] The shell is a cast aluminum shell.

[0011] The plastic fastener is engaged with the housing by screws and applies axial pressure to the silicone sealing gasket.

[0012] The sealing groove has an inner cavity for filling with sealant, the depth of which ranges from 1.5mm to 2.5mm and the width ranges from 1mm to 2mm.

[0013] Advantages of this utility model: 1. By introducing a plastic fastener and sealing groove structure, and injecting a two-component sealant into the sealing groove, the plastic fastener and silicone sealing gasket form an integrated and tightly bonded waterproof interface after curing. This structurally blocks the channel for water vapor to seep in along the high-voltage wire harness core, significantly improving the sealing performance and effectively meeting the protection level requirements of IP67 & IP6K9K. 2. By setting a surrounding sealed groove on the silicone sealing gasket, the sealant spreads evenly along the groove after being compressed, and forms a continuous and complete covering layer after curing, achieving full coverage and sealing of the shielding layer and interface area, effectively eliminating the hidden danger of local leakage caused by assembly gaps in traditional structures. 3. By combining pre-applied sealant with interference-locking of plastic fasteners, the assembly process is simplified and highly controllable. The sealing effect does not depend on manual pressure or tightness, significantly reducing the sealing failure rate during production and improving product consistency and pass rate. Attached Figure Description

[0014] Figure 1 This is an exploded view of the PTC heater wiring harness spin-type sealing structure of this utility model; Figure 2 This is a schematic diagram of the silicone sealing gasket in the PTC heater wire harness spin-type sealing structure of this utility model. Detailed Implementation

[0015] The PTC heater harness wire-spinning sealing structure of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] Example: The PTC heater wiring harness spin-out sealing structure includes a high-voltage connector 1, a high-voltage wiring harness 2, a housing 6 for installation and fixing, a silicone sealing gasket 4 for sealing and waterproofing, and a plastic fixing component 5 for compression and fixing. One end of the high-voltage wiring harness 2 is electrically connected to the high-voltage connector 1, and the other end of the high-voltage wiring harness 2 passes through the silicone sealing gasket 4 and the plastic fixing component 5 in sequence and is fixedly connected to the plastic fixing component 5. The protruding part of the high-voltage wiring harness 2 is fixed in the housing 6 by the plastic fixing component 5 and is compressed and sealed by the silicone sealing gasket 4. The sealing surface of the silicone sealing gasket 4 is in contact with the plastic fixing component 5. The silicone sealing gasket 4 has two through holes 8 for passing the high-voltage wiring harness, and the periphery of the through holes 8 has a closed surrounding sealing groove 7 along the edge of the sealing surface. The sealing groove 7 is filled with sealant, which is a two-component sealant; the sealing groove 7 has an inner cavity for filling the sealant, the depth of which ranges from 1.5mm to 2.5mm and the width ranges from 1mm to 2mm; the outer surface of the silicone sealing gasket 4 has several annular sealing ribs 9 for interference fit with the inner cavity of the housing 6, the sealing ribs 9 are spaced 3mm apart; the inner cavity of the plastic fastener 5 has a metal shielding ring 3 that is sleeved on the high-voltage wire harness 2; the housing 6 is a cast aluminum housing; the plastic fastener 5 is locked with the housing 6 by screws and applies axial pressure to the silicone sealing gasket 4; the sealing groove 7 has an inner cavity for filling the sealant, the depth of which ranges from 1.5mm to 2.5mm and the width ranges from 1mm to 2mm.

[0017] Usage procedure: Before sealing, apply a ring of two-component sealant to the sealing groove, then press the plastic fastener and silicone sealing gasket together. The sealant will tightly wrap and adhere the plastic fastener and silicone sealing gasket along the groove. After the sealant cures, the two parts will be in a tight fit, preventing moisture from penetrating. At this point, the upper plastic fastener is secured with screws using an interference fit to ensure the heater meets the IP67 & IP6K9K performance requirements.

Claims

1. A PTC heater wiring harness spin-off sealing structure, comprising a high-voltage connector (1), a high-voltage wiring harness (2), and a housing (6) for mounting and fixing, wherein one end of the high-voltage wiring harness (2) is electrically connected to the high-voltage connector (1), characterized in that: It also includes a silicone sealing gasket (4) for sealing and waterproofing and a plastic fastener (5) for pressing and fixing. The other end of the high-voltage wire harness (2) passes through the silicone sealing gasket (4) and the plastic fastener (5) in sequence and is fixedly connected to the plastic fastener (5). The protruding part of the high-voltage wire harness (2) is fixed in the housing (6) by the plastic fastener (5) and pressed and sealed by the silicone sealing gasket (4).

2. The PTC heater wiring harness spin-type sealing structure according to claim 1, characterized in that: The sealing surface of the silicone sealing gasket (4) is attached to the plastic fastener (5). The silicone sealing gasket (4) is provided with a through hole (8) for passing through the high voltage wire harness. The outer periphery of the through hole (8) is provided with a closed sealing groove (7) along the edge of the sealing surface. The sealing groove (7) is filled with sealant.

3. The PTC heater wiring harness spin-type sealing structure according to claim 2, characterized in that: The number of through holes (8) is two.

4. The PTC heater wiring harness spin-type sealing structure according to claim 1, characterized in that: The outer surface of the silicone sealing gasket (4) is provided with several annular sealing ribs (9) for interference fit with the inner cavity of the housing (6).

5. The PTC heater wiring harness spin-type sealing structure according to claim 4, characterized in that: The sealing ribs (9) are spaced 3mm apart.

6. The PTC heater wiring harness spin-type sealing structure according to claim 1, characterized in that: The plastic fastener (5) has a metal shielding ring (3) that is sleeved on the high-voltage wire harness (2) inside its cavity.

7. The PTC heater wiring harness spin-type sealing structure according to claim 1, characterized in that: The housing (6) is a cast aluminum housing.

8. The PTC heater wiring harness spin-type sealing structure according to claim 1, characterized in that: The plastic fastener (5) is engaged with the housing (6) by means of screw locking and applies axial pressure to the silicone sealing gasket (4).

9. The PTC heater wiring harness spin-type sealing structure according to claim 2, characterized in that: The sealing groove (7) is provided with an inner cavity for filling with sealant. The depth of the inner cavity ranges from 1.5mm to 2.5mm, and the width ranges from 1mm to 2mm.

Images