Thermal insulation protection structure of pressure sensor

Abstract

The invention discloses a pressure sensor heat insulation protection structure, which comprises a pressure sensor connector, an aluminum foil sleeve and a cover plate, and is characterized in that the pressure sensor connector is inserted into a crankcase pressure sensor; the aluminum foil sleeve is a cylinder with two open ends, a receding opening is formed in the front end of the aluminum foil sleeve, and the cover plate is arranged at the rear end of the aluminum foil sleeve. The cover plate is provided with a central through hole, and a plurality of radial grooves are formed in the periphery of the central through hole. The invention has the advantages of simple structure, good heat insulation effect, stable fixation, no displacement and the like.

Description

Technical Field

[0001] The invention relates to the technical field of engine accessories, and in particular to a heat insulation protection structure for a pressure sensor. Background Art

[0002] On the exhaust side of the engine, pressure sensors are installed on the pipes and arranged in the air, such as crankcase pressure sensors and oil pressure and temperature sensors. They are close to the exhaust pipe and supercharger, the heat source on the exhaust side, within 180mm. Since the heat insulation capacity of the exhaust pipe and the lower side of the supercharger is weak, the dissipated heat damages the crankcase pressure sensor. At present, aluminum foil and glass fiber are woven into an aluminum foil sleeve to cover the crankcase pressure sensor for heat insulation. However, this insulation solution is complicated to assemble, and because the aluminum foil sleeve is too thin at 0.5mm, the sensor seat is easily deformed after being cut and rinsed by a high-pressure water gun, resulting in ineffective protection.

[0003] For example, if the oil pressure temperature sensor is equipped with a metal buckle-type high-temperature insulation cotton aluminum foil and glass fiber cloth to cover the crankcase pressure sensor for insulation, because the connection between the sensor and the mounting base is an L-shaped structure, the insulation sleeve has no limit at the end of the sensor connector, causing it to loosen at the wiring harness end, and cannot ensure long-term effective insulation protection.

[0004] If the crankcase pressure sensor is covered with a metal buckle type high temperature insulation cotton aluminum foil glass fiber cloth with a give way oil pressure temperature sensor for heat insulation, the insulation sleeve needs to have a large installation space at the tail of the sensor connector, but the layout space of this part on the engine is limited, which affects the assembly. If pre-installed in advance, it will affect the locking of the connector CPA lock.

[0005] The disclosure of the above background technology content is only used to assist in understanding the concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0006] The (main) purpose of the present invention is to provide a heat-insulating protection structure for a pressure sensor with a simple structure and good heat-insulating effect.

[0007] To this end, the present invention proposes a heat insulation protection structure for a pressure sensor.

[0008] Preferably, the present invention may also have the following technical features:

[0009] A heat-insulating protection structure for a pressure sensor comprises a pressure sensor connector, an aluminum foil sleeve and a cover plate, wherein the pressure sensor connector is plugged into a crankcase pressure sensor; the aluminum foil sleeve is a cylinder with openings at both ends, a clearance opening is provided at the front end, and the cover plate is provided at the rear end; the cover plate is provided with a central through hole, and a plurality of radial grooves are provided around the central through hole.

[0010] Furthermore, the length L of the radial groove is smaller than the difference between the inner diameter D of the aluminum foil sleeve and the diameter S of the central through hole, that is, L<DS.

[0011] Furthermore, the cover plate is temperature-resistant at 170-180° C. and is fixed to the rear end of the aluminum foil sleeve by glue.

[0012] Furthermore, the glue is temperature resistant to 200°C.

[0013] Furthermore, the aluminum foil sleeve includes two layers, wherein the inner layer is a non-woven fabric material with a temperature resistance of 150°C, and the outer layer is an aluminum foil material with a temperature resistance of 200°C.

[0014] Furthermore, the non-woven fabric and the aluminum foil are bonded by the glue.

[0015] Furthermore, it also includes a high-temperature cable tie, which is wound around the outside of the aluminum foil sleeve.

[0016] Furthermore, the clearance opening extends backward from the front end of the aluminum foil sleeve, and the width of the opening is smaller than the diameter of the aluminum foil sleeve.

[0017] Furthermore, the inner diameter of the aluminum foil sleeve is larger than the outer diameter of the pressure sensor connector.

[0018] Furthermore, the cover plate is made of nylon.

[0019] Compared with the prior art, the beneficial effects of the present invention include: the design of the radial groove separates the cover plate into several sector-shaped areas, and the aluminum foil sleeve is positioned by interlocking and limiting the central clearance hole of the sector-shaped area with the rear shield of the connector and the corrugated tube covering the outer covering of the wiring harness. There are multiple high-temperature accessories arranged on the surface of the engine. Although heat insulation protection measures have been taken for the high-temperature accessories, the high-temperature accessories themselves must also consider heat dissipation, and there will be risks of high-temperature thermal radiation. The heat insulation protection structure of the present invention can greatly reduce the impact of heat radiation from high-temperature accessories on the pressure sensor, reduce the external temperature of the pressure sensor, and increase the service life of the pressure sensor. The structure of the present invention takes into account both positioning and heat insulation, has comprehensive functions, simple structure, low application cost, and significant effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 --4 is a schematic diagram of the structure of the present invention in different orientations.

[0021] Figure 5 It is a top view of the aluminum foil sleeve of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with specific implementations and with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope of the present invention and its application.

[0023] Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein like reference numerals refer to like parts unless otherwise specifically stated.

[0024] like Figure 1-5 A heat-insulating protection structure for a pressure sensor is shown, comprising a pressure sensor connector 5, an aluminum foil sleeve 1, and a cover plate 2. The pressure sensor connector 5 is plugged into the crankcase pressure sensor; the aluminum foil sleeve 1 is a cylinder with openings at both ends, with a clearance opening 4 at the front end and the cover plate 2 at the rear end; the cover plate 2 is provided with a central through hole 11, and a plurality of radial grooves 21 are evenly provided around the central through hole 11, and the radial grooves 21 extend a certain distance from the surroundings of the central through hole 11 to the edge of the cover plate 1. The length L of the radial groove 21 is less than the difference between the inner diameter D of the aluminum foil sleeve 1 and the diameter S of the central through hole 11, that is, L<DS. The outside of the wiring harness connected to the sensor connector 5 is a corrugated wiring harness shell 3, and the radial grooves 21 separate the cover plate 1 into a plurality of sector-shaped areas. When the protective structure is used, the sensor connector wiring harness passes through the central through hole 11, and the front end of the cover plate 1 fan-shaped area is inserted into the corrugated groove of the sensor connector wiring harness shell 3, thereby forming an interlocking limit, thereby limiting the movement of the aluminum foil sleeve 1. Preferably, the fan-shaped area includes a first fan-shaped area 35 and a second fan-shaped area 34, and the first fan-shaped area 35 and the second fan-shaped area 34 are staggered, that is, the two fan-shaped areas adjacent to the first fan-shaped area 35 are the second fan-shaped area 34, or the two fan-shaped areas adjacent to the second fan-shaped area 34 are the first fan-shaped area 35.

[0025] Furthermore, the lengths of the first sector 35 and the second sector 34 are different, that is, the front ends of the two are not on the same circular surface. Specifically, the front end of the first sector 35 extends to the periphery of the central perforation 11, with the central perforation 11 as the boundary. The diameter of the pitch circle surrounded by the front end of the second sector 34 is larger than the diameter of the central perforation 11. In other words, the distance from the front end of the first sector 35 to the bottom of the radial groove 21 is P, and the distance from the front end of the second sector 34 to the bottom of the radial groove 21 is Q, then P is greater than Q. The lengths of the first sector 35 and the second sector 35 are different, which facilitates the installation of the sensor connector harness. When in use, the front end of the longer first sector 35 is stuck in the corrugated groove I31 of the sensor connector harness shell 3, and the front end of the second sector 34 is stuck in the corrugated groove II32 of the sensor connector harness shell 3. Moreover, the corrugated groove I31 and the corrugated groove II32 are not in the same position, wherein the corrugated groove II32 coincides with the center perforation, and the front end of the second sector area 34 is straightly inserted into the corrugated groove II32; the corrugated groove I31 is away from the aluminum foil sleeve 1, and the front end of the first sector area 35 is obliquely inserted into the corrugated groove I31, so that the first sector area 35 is bent and has a certain elastic supporting force, which can enhance the connection stability between the aluminum foil sleeve 1 and the sensor connector wiring harness shell 3.

[0026] Preferably, the cover plate 1 is made of nylon material, which has a temperature resistance of 170-180°C, such as 175°C, and is fixed to the rear end of the aluminum foil sleeve 1 by glue. The glue has a temperature resistance of 200°C.

[0027] The aluminum foil sleeve 1 comprises two layers, wherein the inner layer is a non-woven fabric material with a temperature resistance of 150° C., and the outer layer is an aluminum foil material with a temperature resistance of 200° C. The non-woven fabric and the aluminum foil are bonded by the glue.

[0028] Furthermore, a high temperature cable tie is included, which is wound around the outside of the aluminum foil sleeve 1 to fasten the aluminum foil sleeve 1 to the pressure sensor connector 5, thereby further preventing the aluminum foil sleeve 1 from loosening.

[0029] The clearance opening 4 extends backward from the front end of the aluminum foil sleeve 1, and the width of the opening is smaller than the diameter of the aluminum foil sleeve 1. The inner diameter of the aluminum foil sleeve 1 is larger than the outer diameter of the pressure sensor connector 5. During installation, the clearance opening 4 forms a clearance space, and the aluminum foil sleeve 1 does not affect the installation of the sensor connector. Generally speaking, when the sensor connector 5 is connected to the pressure sensor, the front end of the aluminum foil sleeve 1 completely covers the sensor connector 5, achieving a good heat insulation effect.

[0030] Those skilled in the art will appreciate that numerous variations to the above description are possible, and that the examples and figures are intended only to describe one or more specific implementations.

[0031] Although what is considered as exemplary embodiments of the present invention has been described and described, it will be understood by those skilled in the art that various changes and substitutions may be made thereto without departing from the spirit of the present invention. In addition, many modifications may be made to adapt specific situations to the teachings of the present invention without departing from the central concept of the present invention described herein. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but the present invention may also include all embodiments and their equivalents that fall within the scope of the present invention.

Claims

1. A heat insulation protection structure for a pressure sensor, characterized in that: It comprises a pressure sensor connector, an aluminum foil sleeve and a cover plate. The pressure sensor connector is plugged into the crankcase pressure sensor. The aluminum foil sleeve is a cylinder with openings at both ends, a clearance opening is provided at the front end, and the cover plate is provided at the rear end. The cover plate is provided with a central through hole, and a plurality of radial grooves are provided around the central through hole.

2. A heat-insulating protective structure for a pressure sensor as claimed in claim 1, characterized in that: The length L of the radial groove is smaller than the difference between the inner diameter D of the aluminum foil sleeve and the diameter S of the central through hole, that is, L<DS.

3. A heat-insulating protective structure for a pressure sensor as claimed in claim 1, characterized in that: The cover plate is temperature-resistant at 170-180° C. and is fixed to the rear end of the aluminum foil sleeve by glue.

4. A heat-insulating protective structure for a pressure sensor as claimed in claim 3, characterized in that: The glue is temperature resistant to 200°C.

5. A heat-insulating protective structure for a pressure sensor as claimed in claim 1, characterized in that: The aluminum foil sleeve comprises two layers, wherein the inner layer is a non-woven fabric material with a temperature resistance of 150°C, and the outer layer is an aluminum foil material with a temperature resistance of 200°C.

6. A heat-insulating protective structure for a pressure sensor as claimed in claim 5, characterized in that: The non-woven fabric and the aluminum foil are bonded by the glue.

7. A heat-insulating protective structure for a pressure sensor as claimed in claim 1, characterized in that: Also included is a high temperature cable tie which is wound around the outside of the aluminum foil sleeve.

8. A heat-insulating protective structure for a pressure sensor as claimed in claim 1, characterized in that: The clearance opening extends backward from the front end of the aluminum foil sleeve, and the width of the opening is smaller than the diameter of the aluminum foil sleeve.

9. A heat-insulating protective structure for a pressure sensor as claimed in claim 8, characterized in that: The inner diameter of the aluminum foil sleeve is greater than the outer diameter of the pressure sensor connector.

10. A heat-insulating protective structure for a pressure sensor according to claim 1, characterized in that: The material of the cover plate is nylon.

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