Inductive device connection cable isolation sealed exit device

Abstract

The application provides a kind of induction device connecting cable isolation sealing lead-out device, the device includes sealing plug and the connecting cable of induction device passing through sealing plug, the elastic sleeve segment with length shorter than the plug length of sealing plug is arranged on the connecting cable, and the connecting cable part where the elastic sleeve segment is located is cast in sealing plug by thermoplastic pressure casting sealing.The technical scheme realizes the excellent isolation sealing between the induction device working in the fluid medium closed filling environment and the medium closed environment and open space, and can also stably and reliably maintain the sealing and closed performance in the complex change of temperature high and low.

Description

TECHNICAL FIELD

[0001] The present application relates to a protective insulation sealing lead-out device of a functional device connecting cable, in particular to a sensor signal transmission cable and a signal transmission cable setting position sealing lead-out structure. BACKGROUND

[0002] A large number of various sensor devices, including temperature sensors, speed sensors, etc., are needed in intelligent, security protection, etc. devices or equipment. The sensor devices are various in types, and the use environment and installation method are also quite different. Among them, the sensor devices applied to the oil sealed space, the signal cable thereof needs to be well sealed, and also needs to be well sealed from the sealed space to the open space of the instrument side.

[0003] Taking an oil-cooled motor temperature protection device as an example. The oil-cooled motor overcomes the technical defects of poor heat dissipation effect and greater impact on the service life of the motor caused by the separation of temperature detection and cooling treatment of the water-cooled motor, and adopts a motor winding oil immersion heat dissipation structure. Therefore, to implement accurate temperature monitoring, the temperature sensing device installed in the motor winding with fast temperature change is the only choice for implementing accurate temperature control operation, but in this heat exchange medium filling closed environment, the sealing performance between the temperature sensing device and the connecting cable, and the sealing performance between the connecting cable and the sealing plug will directly affect the use effect and service life of the sensing performance, which is a key technology for evaluating and improving the product quality and performance of the oil-cooled motor.

[0004] The prior art generally adopts a connecting cable inserted in a nylon sheath, and then inserted in a nylon sealing plug body, and the cable and the plug body are pressure cast into an integral seal through a thermoplastic extrusion process, but in experiments: -40℃~+155℃, maintaining high and low temperatures for 48 hours for one cycle, after 8 cycles, the nylon sheath appears cracking phenomenon, 2MPa pressure gas tightness test, the connecting end of the sensor device and the cable, the sheath and the sealing plug between the sheath and the sealing plug all appear different degrees of air leakage phenomenon, which does not achieve the technical effect of complete sealing. SUMMARY

[0005] The application aims to solve the problem of the sensing device working in the fluid medium closed filling environment, and to provide a sensing device connecting cable isolation sealing lead-out device which can ensure good isolation and sealing between the closed environment and the open space.

[0006] Based on the above application purpose, the application further solves the technical problem of how to ensure that the sensing device and its connecting cable have good air tightness in the fluid medium filling closed environment, and can stably and reliably maintain the above performance in the complex change of temperature high and low.

[0007] The technical scheme of the application provides an inductive device connecting cable isolation sealing lead-out device, which mainly comprises a sealing plug and a connecting cable of an inductive device penetrating through the sealing plug.

[0008] In one preferred option of the above-mentioned overall technical scheme, a part of the connecting cable in the elastic sleeve segment is a bare section of a bare conductive core wire without an insulating outer layer, and the bare section is tightly wrapped by a heat-shrinkable sheath, penetrates through the elastic sleeve segment, and is tightly and sealingly cast in the sealing plug by hot-pressing and casting.

[0009] In one preferred option of the above-mentioned overall technical scheme, the bare section is filled and sealed by soldering tin.

[0010] In one preferred option of the above-mentioned overall technical scheme, the heat-shrinkable sheath is shorter than the sealing plug, and can be shorter than or longer than the elastic sleeve segment.

[0011] The technical scheme of the application realizes excellent isolation sealing between an inductive device working in a fluid medium closed filling environment and a medium closed environment and an open space, and can stably and reliably maintain the sealing and closed performance in complex changes of temperature, and further realizes excellent air tightness of the inductive device and its connecting cable in the fluid medium filling closed environment, and stably and reliably maintains the sealing and closed performance in complex changes of temperature. The technical scheme realizes the technical purpose of integrated sealing of the front-end inductive device and its lead-out, as described above, the temperature sensor application example of the cooling protection motor, the application of the technical scheme can ensure that the temperature sensing device is placed in the temperature sensing area of the motor winding immersed in cooling oil in all directions, and ensures that the oil-cooled motor is always in excellent temperature control protection with reliable and rapid response, and meets the stable operation demand of the high-multiple operation motor, such as being applied to a new energy vehicle, and greatly improves the product quality and performance of the new energy vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 The overall structure diagram of the application.

[0013] Figures 2-6 The sealing plug part sectional view structure diagrams of the embodiments of the application. DETAILED DESCRIPTION

[0014] With oil-cooled motor application as an example, the induction device connecting cable isolation sealing lead-out device disclosed in the application, the induction device is a front temperature sensing device 3 arranged in the cooling oil circuit of the motor winding, the connecting cable 2 is isolated and sealed to lead out the cooling oil cavity through the induction device connecting cable isolation sealing lead-out device, and is connected to the signal acquisition unit on the detection instrument side in the open space to transmit the temperature signal in real time.

[0015] The induction device connecting cable isolation sealing lead-out device comprises a sealing plug 1 and a connecting cable 2 of the temperature sensing device 3 passing through the sealing plug 1.

[0016] The sealing plug 1 is combined with the connecting cable 2 through a thermoplastic pressure casting process, and the connecting cable 2 is sealed and led out from the inner oil circuit environment to the outer open space through the sealing plug 1.

[0017] Embodiment 1: as shown in Figure 2 and Figure 3 , an elastic sleeve segment 4 with a length shorter than the plug length of the sealing plug 1 is arranged on the connecting cable 2, and the elastic sleeve can be selected from the sleeve of elastic insulation materials such as silicone rubber, nitrile rubber and fluororubber. The elastic sleeve segment 4 and the connecting cable part where the elastic sleeve segment 4 is located are cast and embedded in the sealing plug 1 through thermoplastic pressure casting sealing and fastening, and the elasticity of the elastic sleeve segment 4 is tightly and fastenedly combined with the sealing plug 1 in the thermoplastic pressure casting of the sealing plug 1 to form an integrated body, and is sealed and combined with the connecting cable 2.

[0018] Experimental test: 100 finished products are sampled, and the experimental conditions are as follows: -40℃~+155℃, maintaining 48 hours at high and low temperature values in turn as one cycle, and after 8 cycles, 2MPa pressure tightness test is carried out again. The sealing plug 1 part is completely sealed, but most of the samples have air leakage phenomenon at the combined part of the temperature sensing device 3 and the connecting cable 2.

[0019] Embodiment 2: as shown in Figure 4 , a bare section 5 exposing the conductive core wire is formed by peeling off a section of the insulating outer layer of the connecting cable 2, the elastic sleeve segment 4 is arranged on the heat-shrinkable sheath 6 after the bare section 5 is tightly wrapped by the heat-shrinkable sheath 6, and finally the elastic sleeve segment 4 is cast and embedded in the sealing plug 1 through thermoplastic pressure casting fastening sealing.

[0020] The experimental results are the same as those of embodiment 1, that is, the sealing plug 1 part is completely sealed, but a few samples have air leakage phenomenon at the combined part of the temperature sensing device 3 and the connecting cable 2.

[0021] Embodiment 3: as shown in Figure 6 , the bare section 5 is filled and sealed by soldering tin, then the bare section 5 is tightly wrapped by the heat-shrinkable sheath 6, the elastic sleeve segment 4 is arranged on the heat-shrinkable sheath 6, and finally the elastic sleeve segment 4 is cast and embedded in the sealing plug 1 through thermoplastic pressure casting fastening sealing.

[0022] The sealing plug 1 and the temperature sensing device 3 are not leaked, and the sealing effect is the best.

[0023] The protection scope of the present application is not limited to the specific examples. In the examples, the connecting cable 2 can be an electric lead of one temperature sensing device 3, or electric leads of multiple temperature sensing devices 3. Figure 5 、 Figure 6 As shown in the figure, the connecting cables 2 of the multiple temperature sensing devices 3 are arranged in the same elastic sleeve segment 4. In the hot-pressing casting of the sealing plug 1, the elastic sleeve segment 4 is tightly fixed with the sealing plug 1 due to its elasticity, and is sealed with the connecting cables 2.

[0024] The heat-shrinkable sheath 6 is shorter than the sealing plug 1, and can be shorter or longer than the elastic sleeve segment 4.

Claims

1. An inductive device connecting cable isolation sealing lead-out device, comprising a sealing plug (1) and an inductive device connecting cable (2) running through the sealing plug (1); characterized in that an elastic sleeve section (4) with a length shorter than the length of the sealing plug (1) is arranged on the connecting cable (2), and a bare section (5) of the connecting cable (2) with the insulating outer layer removed and the conductive core wire exposed is tightly wrapped by a heat-shrinkable sheath (6) and then arranged in the elastic sleeve section (4), and the heat-shrinkable sheath (6) is tightly fixed and sealed in the sealing plug (1) by hot-pressing and casting; the bare section (5) is filled and sealed by soldering; the length of the heat-shrinkable sheath (6) is shorter than the length of the sealing plug (1); the elastic sleeve section (4) is made of silicone rubber, nitrile rubber or fluororubber elastic insulation material.

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