Pressure and temperature composite sensor for automobile air conditioner

Abstract

The utility model discloses a pressure and temperature composite sensor for an automobile air conditioner. Comprising a shell, an elastic tube, a pressure channel, a stress isolation groove, a first insulation sheet connected to the bottom of the elastic tube, a second insulation sheet connected to the bottom of the shell, a third insulation sheet, a fourth insulation sheet connected to the bottom of the second insulation sheet, a movable electrode sheet, a fifth insulation sheet, a fixed electrode sheet and a conductive piece. The movable electrode plate and the fixed electrode plate correspond to each other up and down, a gap is kept between the movable electrode plate and the fixed electrode plate, the sheath tube is arranged in the elastic tube, the lower end of the sheath tube is fixedly connected with a tube end, and the tube end is welded with the elastic tube. According to the technical scheme, the NTC thermistor is wrapped in the protective sleeve through the heat conduction gel, the protective sleeve is arranged in the elastic pipe, the upper end of the protective sleeve extends out of the sensor, when a fluid medium flows through the upper end of the protective sleeve from the upper portion of the pressure sensor, heat is transmitted to the NTC thermistor through the protective sleeve, temperature measurement can be rapidly achieved, and the response time of temperature measurement is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to a pressure-temperature composite sensor for automotive air conditioning. Background Technology

[0002] Chinese patent application number 202422160384.5 protects a novel pressure-temperature composite sensor. In this sensor, the NTC thermistor is placed inside a stress isolation groove, and the elastic tube used for pressure measurement is also used as a protective sleeve for the temperature sensor. Although the structure is simplified, the response time for temperature measurement is prolonged because the NTC thermistor, which is the temperature sensing element, is located inside the pressure sensor. Utility Model Content

[0003] In order to overcome the existing technical defects, the purpose of this utility model is to provide a pressure-temperature composite sensor for automotive air conditioning to solve the above-mentioned technical problems.

[0004] The technical solution adopted by this utility model to solve the technical problem is as follows:

[0005] According to one aspect of this utility model, a pressure-temperature composite sensor for automotive air conditioning is designed, comprising: a housing, an elastic tube connected within the housing, a pressure channel, a stress isolation groove, a first insulating sheet connected to the bottom of the elastic tube by an adhesive and a second insulating sheet connected to the bottom of the housing, a third insulating sheet connected to the bottom of the first insulating sheet by an adhesive and a fourth insulating sheet connected to the bottom of the second insulating sheet, a movable electrode sheet disposed at the bottom of the third insulating sheet, a fifth insulating sheet connected to the fourth insulating sheet by a sealant, a fixed electrode sheet disposed at the top of the fifth insulating sheet, a conductive element having one end electrically connected to the movable electrode sheet and the other end extending to the outside of the housing and having a bent structure within the stress isolation groove, a fixed electrode lead electrically connected to the fixed electrode sheet, and an NTC thermistor wrapped inside the upper end of a sheath tube by a thermally conductive gel. The movable electrode sheet and the fixed electrode sheet are vertically aligned and maintain a gap. The sheath tube is disposed within the elastic tube, and a tube end is fixedly connected to the lower end of the sheath tube, the tube end being welded to the elastic tube.

[0006] Using the above technical solution, the NTC thermistor is wrapped inside the upper end of a sheath tube with thermally conductive gel. The sheath tube is located inside an elastic tube with its upper end extending out of the sensor. When the fluid medium flows from above the pressure sensor through the upper end of the sheath tube, heat is transferred to the NTC thermistor through the sheath tube, enabling rapid temperature measurement and improving the response time. In addition, the tube end and the elastic tube are welded together, improving the sealing performance of the connection between the two and reducing the leakage rate of the measured fluid at the connection point by two orders of magnitude. When the measured fluid medium enters the pressure channel, it acts on the elastic tube, causing a change in the gap between the movable electrode and the fixed electrode, resulting in a change in capacitance, thereby measuring the fluid medium pressure.

[0007] To better address the aforementioned technical deficiencies, this utility model also offers a superior technical solution:

[0008] In some embodiments, the NTC thermistor is electrically connected to an NTC lead. The portion of the NTC lead located in the stress isolation groove has a bent structure, and the other lower end of the NTC lead extends to the outside of the housing through the adhesive between the first and third insulating sheets and the adhesive between the second and fourth insulating sheets. By providing a bent structure in the portion of the NTC lead located in the stress isolation groove, when the fluid medium enters the pressure channel and causes vertical elastic deformation of the elastic tube, the bent structure can prevent the NTC lead from being stretched, thus preventing any impact on pressure measurement and ensuring the accuracy of pressure measurement.

[0009] In some embodiments, a corrugated sheet is connected to the open portion of the pressure channel. The upper end of the sheath extends through a through-hole in the corrugated sheet to the top of the housing. The corrugated sheet has several openings for the medium to enter the elastic tube. The NTC thermistor is located inside the upper end of the sheath. The corrugated sheet enhances the vibration and impact resistance without affecting the mechanical properties of the elastic tube, while also preventing the upper end of the sheath from swaying. With the upper end of the sheath extending to the top of the housing, the fluid medium being measured directly contacts the upper end of the sheath before entering the pressure channel. The heat is conducted to the NTC thermistor encased within it via the thermally conductive gel, further improving the temperature measurement response time.

[0010] In some embodiments, the lower end of the sheath tube is open, and its material is any one of stainless steel, copper, aluminum alloy, or ceramic.

[0011] In some embodiments, the lower end of the sheath extends below the tube end. Attached Figure Description

[0012] Figure 1 A schematic diagram of the structure of a pressure-temperature composite sensor for automotive air conditioning according to one embodiment of this utility model;

[0013] Figure label:

[0014] 1. Housing; 101. Elastic tube; 102. Pressure channel; 103. Stress isolation groove; 2. First insulating sheet; 3. Second insulating sheet; 4. Third insulating sheet; 5. Fourth insulating sheet; 51. Sealant; 6. Movable electrode sheet; 7. Fifth insulating sheet; 8. Fixed electrode sheet; 81. Fixed electrode lead; 9. Conductive component; 91. Movable electrode lead; 10. Thermal conductive gel; 11. Sheath tube; 12. NTC thermistor; 13. NTC lead; 14. Tube end; 15. Corrugated sheet; 161. Upper support; 162. Lower support; N1. Adhesive one; N2. Adhesive two. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0016] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] In the description of this utility model, unless otherwise explicitly defined, terms such as setting, installing, connecting, and fixing should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0018] refer to Figure 1As shown, this utility model provides a pressure-temperature composite sensor for automotive air conditioning, comprising: a housing 1; an elastic tube 101 connected inside the housing 1 and having a thin-walled cylindrical structure; a pressure channel 102 extending from the inside of the elastic tube 101 to the outside of the housing 1; a stress isolation groove 103 formed between the elastic tube 101 and the housing 1; a first insulating sheet 2 connected to the bottom of the elastic tube 101 by adhesive N1; a second insulating sheet 3 connected to the bottom of the housing 1 by adhesive N1; a third insulating sheet 4 connected to the bottom of the first insulating sheet 2 by adhesive N2; a fourth insulating sheet 5 connected to the bottom of the second insulating sheet 3 by adhesive N2; a movable electrode sheet 6 disposed at the bottom of the third insulating sheet 4; a fifth insulating sheet 7 disposed below the fourth insulating sheet 5 and connected to the fourth insulating sheet 5 by sealant 51; a fixed electrode sheet 8 disposed at the top of the fifth insulating sheet 7; a conductive element 9, one end electrically connected to the movable electrode sheet 6 and the other end extending to the outside of the housing 1; and... The fixed electrode plate 8 is electrically connected to the fixed electrode lead 81, which extends to the outside at its lower end, and the NTC thermistor 12 is wrapped inside the upper end of the sheath tube 11 by the thermally conductive gel 10. The movable electrode plate 6 corresponds to the fixed electrode plate 8 vertically and maintains a gap, forming a measuring capacitor. The sheath tube 11 is made of any one of stainless steel, copper, aluminum alloy, and ceramic, but is not limited to these. It can also be made of other materials. In this embodiment, the sheath tube 11 is preferably made of stainless steel. The sheath tube 11 is located inside the elastic tube 101. The lower end of the sheath tube 11 passes through the tube end 14 and extends below the tube end 14. The lower end of the sheath tube 11 is open. The tube end 14 is made of the same material as the sheath tube 11. The tube end 14 and the sheath tube 11 are fixedly connected. Specifically, the tube end 14 and the sheath tube 11 are welded, glued, or fixed by screws, etc. In this embodiment, the tube end 14 and the sheath tube 11 are preferably sealed and welded, and the outer periphery of the tube end 14 is sealed and welded to the elastic tube 101.

[0019] The NTC thermistor 12 is electrically connected to an NTC lead 13. The portion of the NTC lead 13 located in the stress isolation groove 103 has a bent structure. The other lower end of the NTC lead 13 passes through the adhesive N1 between the first insulating sheet 2 and the third insulating sheet 4, and the adhesive N2 between the second insulating sheet 3 and the fourth insulating sheet 5, extending to the outside of the housing 1, and finally extending to the fifth insulating sheet 7 to form the NTC pin line 131.

[0020] A corrugated sheet 15 is provided at the open position of the pressure channel 102. The corrugated sheet 15 is made of stainless steel, alloy steel, aluminum alloy, etc. In this embodiment, the corrugated sheet 15 is preferably made of stainless steel. The corrugated sheet 15 is welded to the shell 1. The upper end of the sheath tube 11 extends through the through hole on the corrugated sheet 15 to the top of the shell 1. The corrugated sheet 15 is provided with a number of openings for the fluid medium to enter the elastic tube 101.

[0021] When the fluid medium passes through the opening on the corrugated sheet 15 from above the pressure channel 102 and enters the elastic tube 101, the pressure generated by the fluid medium is transmitted to the tube end 14. The tube end 14 is subjected to pressure, which causes the elastic tube 101 to undergo elastic deformation. Since the elastic tube 101 is a thin-walled cylindrical structure, the lower end of the elastic tube 101 moves up and down with the deformation of the elastic tube 101, changing the distance between the movable electrode 6 and the fixed electrode 8, causing a change in capacitance. The pressure of the fluid medium can be measured by measuring the change in capacitance. The temperature change of the fluid medium can be measured by the NTC thermistor 12.

[0022] The housing 1 is made of aluminum, aluminum alloy, or stainless steel, etc. In this embodiment, the housing 1 is preferably made of stainless steel.

[0023] The first insulating sheet 2, the third insulating sheet 4, the movable electrode sheet 6, and the fixed electrode sheet 8 have a circular, elliptical, quadrilateral, or hexagonal structure. In this embodiment, it is preferred that the first insulating sheet 2, the third insulating sheet 4, the movable electrode sheet 6, and the fixed electrode sheet 8 all have a circular structure. The first insulating sheet 2 has a circular hole inside. The second insulating sheet 3 and the fourth insulating sheet 5 have a ring-shaped or ring-shaped structure. In this embodiment, it is preferred that the second insulating sheet 3 and the fourth insulating sheet 5 both have a ring-shaped structure. The fifth insulating sheet 7 has a circular, quadrilateral, or hexagonal structure. In this embodiment, it is preferred that the fifth insulating sheet 7 has a circular structure.

[0024] The conductive element 9 is made of a flexible material. Further, the conductive element 9 is a copper wire or a long strip of copper sheet. The portion of the conductive element 9 located within the stress isolation groove 103 has a bent structure, and a gap is maintained between the bent portion of the conductive element 9 and the first insulating sheet 2 and the second insulating sheet 3. One end of the conductive element 9 passes through the adhesive N2 between the first insulating sheet 2 and the third insulating sheet 4 and a through hole on the third insulating sheet 4, and is electrically connected to the movable electrode sheet 6. The other end of the conductive element 9 passes through the adhesive N2 between the second insulating sheet 3 and the fourth insulating sheet 5, extending to the outside of the shell 1, and finally to the fifth insulating sheet 7 to form the movable electrode lead 91.

[0025] A support member is provided between the fourth insulating sheet 5 and the fifth insulating sheet 7. The support member includes an upper support member 161 formed by a metal plating layer plated on the bottom of the fourth insulating sheet 5 and a lower support member 162 formed by a metal plating layer plated on the top of the fifth insulating sheet 7. The upper support member 161 and the lower support member 162 are in surface contact. The upper support member 161 and the lower support member 162 have a circular structure or a C-shaped structure. In this embodiment, it is preferred that both the upper support member 161 and the lower support member 162 have a circular structure. The upper support member 161 is at the same height as the movable electrode sheet 6, and the top surface height of the lower support member 162 is higher than the top surface height of the fixed electrode sheet 8.

[0026] The first insulating sheet 2, the second insulating sheet 3, the third insulating sheet 4, the fourth insulating sheet 5, and the fifth insulating sheet 7 are all ceramic insulating sheets or alumina ceramic insulating sheets.

[0027] Both adhesive one (N1) and adhesive two (N2) are low-coefficient epoxy resin adhesives or low-temperature sintered glass.

[0028] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A pressure-temperature composite sensor for automotive air conditioning, characterized in that, include: The system comprises a housing, an elastic tube connected within the housing, a pressure channel, a stress isolation groove, a first insulating sheet connected to the bottom of the elastic tube by an adhesive and a second insulating sheet connected to the bottom of the housing, a third insulating sheet connected to the bottom of the first insulating sheet by an adhesive and a fourth insulating sheet connected to the bottom of the second insulating sheet, a movable electrode sheet located at the bottom of the third insulating sheet, a fifth insulating sheet connected to the fourth insulating sheet by a sealant, a fixed electrode sheet located at the top of the fifth insulating sheet, a conductive component having a bent structure within the stress isolation groove and one end electrically connected to the movable electrode sheet and the other end extending to the outside of the housing, a fixed electrode lead electrically connected to the fixed electrode sheet, and an NTC thermistor wrapped inside the upper end of the sheath tube by a thermally conductive gel. The movable electrode sheet and the fixed electrode sheet are vertically aligned and maintain a gap. The sheath tube is located inside the elastic tube, and a tube end is fixedly connected to the lower end of the sheath tube. The tube end is welded to the elastic tube.

2. The pressure-temperature composite sensor for automotive air conditioning according to claim 1, characterized in that, The NTC thermistor is electrically connected to an NTC lead. The portion of the NTC lead located in the stress isolation groove has a bent structure. The other lower end of the NTC lead extends through the adhesive between the first insulating sheet and the third insulating sheet, and through the adhesive between the second insulating sheet and the fourth insulating sheet, to the outside of the housing.

3. A pressure-temperature composite sensor for automotive air conditioning according to claim 1 or 2, characterized in that, A corrugated sheet is connected to the open position of the pressure channel. The upper end of the sheath extends through the through hole on the corrugated sheet to the top of the housing. The corrugated sheet is provided with several openings for the medium to enter the elastic tube.

4. The pressure-temperature composite sensor for automotive air conditioning according to claim 1, characterized in that, The lower end of the sheath tube is open, and its material is any one of stainless steel, copper, aluminum alloy, or ceramic.

5. A pressure-temperature composite sensor for automotive air conditioning according to claim 1, characterized in that, The lower end of the sheath extends below the tube end.

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