Novel pressure and temperature composite sensor

Abstract

The utility model discloses a novel pressure and temperature composite sensor. Comprising a shell, an elastic tube, a carrying table, a pressure channel, a stress isolation groove, a first insulating sheet, a second insulating sheet, a third insulating sheet, a fourth insulating sheet, a movable electrode sheet, a fifth insulating sheet, a fixed electrode sheet and a conductive piece, wherein the conductive piece is arranged in the stress isolation groove in a bending manner; one end of the conductive piece is electrically connected with the movable electrode sheet; the fixed electrode lead is electrically connected with the fixed electrode slice; the NTC thermistor is wrapped by heat-conducting gel and is arranged in the stress isolation groove; one end of the connecting lead is connected with the NTC thermistor, and the other end of the connecting lead extends to the outside of the shell. By adopting the technical scheme, the elastic tube of the pressure sensor is also used as a protective sleeve of the NTC thermistor, so that a single pressure sensor is changed into a temperature and pressure integrated composite sensor; the conductive piece arranged in the stress isolation groove in a bent mode changes the previous two capacitor structures connected in series into a single capacitor structure, and the size can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field related to sensors, and in particular to a novel pressure-temperature composite sensor. Background Art

[0002] Current temperature and pressure combination sensors used in automotive air conditioning heat pumps mostly consist of a ceramic capacitor pressure sensor and an NTC probe. The NTC probe head is typically overmolded or welded with a metal sleeve. After the NTC head is overmolded, the leads require specialized structural molding and sealing, which is a complex process. Welding the metal sleeve to the head is also challenging and carries the risk of fluid and air leakage.

[0003] Chinese patent CN116625568A discloses a high-range integrated capacitive pressure sensor. Due to limitations in the electrode lead-out method, a disc-shaped insulating sheet is coated with a metal film to serve as the upper plate of a variable capacitor. The metal film on the other insulating sheet consists of two separated semicircular metal films, each corresponding to the upper plate and serving as the lower plate of the variable capacitor. Together with the upper plate, they form two capacitors connected in series, equivalent to a single variable capacitor. Two metallized leads are connected to the two semicircular metal films, serving as lead-out leads for the variable capacitor. Because the two capacitors are divided into two capacitors on the same area, their capacitance is reduced to 1 / 2. Furthermore, because the two capacitors are connected in series, their equivalent capacitance is only 1 / 4 that of a single capacitor of the same area. The capacitance signal processing circuit requires a full-scale capacitance variation of at least 4 pF, which requires a relatively large plate area for the variable capacitor. Consequently, this method of electrically connecting and leading the capacitor plates results in a relatively large pressure sensor for the same capacitance, hindering its miniaturization. Utility Model Content

[0004] In order to overcome the existing technical defects, the purpose of the present invention is to provide a new pressure-temperature composite sensor to solve the above technical problems.

[0005] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0006] According to one aspect of the present utility model, a novel pressure-temperature composite sensor is designed, comprising: a shell, an elastic tube connected to the shell, a carrier located at the lower end of the elastic tube, a pressure channel, a stress isolation groove, a first insulating sheet connected to the bottom of the carrier by adhesive 1 and a second insulating sheet connected to the bottom of the shell, a third insulating sheet connected to the bottom of the first insulating sheet by adhesive 2 and a fourth insulating sheet connected to the bottom of the second insulating sheet, a movable electrode sheet arranged at the bottom of the third insulating sheet, a fifth insulating sheet connected to the fourth insulating sheet by sealant, a fixed electrode sheet arranged at the top of the fifth insulating sheet, a conductive member having one end electrically connected to the movable electrode sheet and the other end extending to the outside of the shell and having a bend in the corresponding part of the stress isolation groove, and a fixed electrode lead electrically connected to the fixed electrode sheet, wherein the movable electrode sheet corresponds to the fixed electrode sheet up and down and maintains a gap.

[0007] By adopting the above technical solution, a conductive part is added to the existing structure, which is bent in the stress isolation groove and electrically connected to the movable electrode sheet at one end and extends to the outside of the shell at the other end. The previous two series-connected capacitor structures are changed into a single capacitor structure. When the sensor has the same capacitance value, the volume can be reduced to meet the needs of miniaturization.

[0008] In order to better solve the above technical defects, the present invention also has a better technical solution:

[0009] In some embodiments, the conductive member is a copper wire or a long copper sheet, and a gap is maintained between the bent portion of the conductive member and the carrier.

[0010] In some embodiments, the device further includes an NTC thermistor and connecting wires. The NTC thermistor is disposed within the stress isolation groove and encapsulated in thermally conductive gel. The upper end of the connecting wire is connected to the NTC thermistor, and the lower end of the connecting wire extends through the adhesive between the second and fourth insulating sheets to the exterior of the housing, forming an NTC lead. By disposing the NTC thermistor encapsulated in thermally conductive gel within the stress isolation groove and providing corresponding connecting wires, a temperature-pressure composite sensor capable of detecting both pressure and temperature is formed. Encapsulating the NTC thermistor in thermally conductive gel simplifies the process and facilitates production and processing.

[0011] In some embodiments, one end of the conductive member passes through the adhesive 2 between the first insulating sheet and the third insulating sheet and the through hole on the third insulating sheet to be electrically connected to the movable electrode sheet, and the other end of the conductive member passes through the adhesive 2 between the second insulating sheet and the fourth insulating sheet to extend to the outside of the shell to constitute a movable electrode lead.

[0012] In some embodiments, the first insulating sheet, the third insulating sheet, the movable electrode sheet and the fixed electrode sheet have a circular structure, an elliptical structure, a quadrilateral structure or a hexagonal structure, and the second insulating sheet and the fourth insulating sheet have a circular structure or a C-shaped structure.

[0013] In some embodiments, the fifth insulating sheet has a circular structure, a quadrilateral structure, or a hexagonal structure.

[0014] In some embodiments, a support member is provided between the fourth insulating sheet and the fifth insulating sheet.

[0015] In some embodiments, the support member includes an upper support member formed by a metal coating plated on the bottom of the fourth insulating sheet and a lower support member formed by a metal coating plated on the top of the fifth insulating sheet. The upper support member is in surface contact with the lower support member, the upper support member is at the same height as the movable electrode sheet, and the top surface height of the lower support member is higher than the top surface height of the fixed electrode sheet.

[0016] In some embodiments, the upper support member and the lower support member are in a circular ring structure or a C-shaped structure.

[0017] In some embodiments, the elastic tube is a thin-walled cylindrical structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a novel pressure-temperature composite sensor according to an embodiment of the present invention;

[0019] Figure 2 Schematic diagram of the structure of the shell when viewed from above;

[0020] Figure 3 is a schematic structural diagram of the fifth insulating sheet and the fixed electrode sheet;

[0021] Reference numerals:

[0022] 1. Shell; 101. Elastic tube; 102. Carrier; 103. Pressure channel; 104. Stress isolation groove; 2. First insulating sheet; 3. Second insulating sheet; 4. Third insulating sheet; 5. Fourth insulating sheet; 6. Movable electrode sheet; 7. Fifth insulating sheet; 71. Sealant; 8. Fixed electrode sheet; 10. Conductive member; 1011. Movable electrode lead; 11. Fixed electrode lead; 12. Thermal conductive gel; 13. NTC thermistor; 15. Connecting wire; 151. NTC lead; 16. Support member; 161. Upper support member; 162. Lower support member; N1. Adhesive 1; N2. Adhesive 2. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0024] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0025] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, and fixing should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0026] refer to Figures 1 to 3 As shown, the utility model provides a novel pressure-temperature composite sensor, comprising: a housing 1, an elastic tube 101 connected to the housing 1 and having a thin-walled cylindrical structure, a carrier 102 located at the lower end of the elastic tube 101, a pressure channel 103 extending from the inside of the elastic tube 101 to the outside of the housing 1, a stress isolation groove 104 formed between the elastic tube 101 and the housing 1, a first insulating sheet 2 connected to the bottom of the carrier 102 via an adhesive N1, a second insulating sheet 3 connected to the bottom of the housing 1 via an adhesive N1, a third insulating sheet 4 connected to the bottom of the first insulating sheet 2 via an adhesive N2, a fourth insulating sheet 5 connected to the bottom of the second insulating sheet 3 via an adhesive N2, and a pressure channel 103 extending from the inside of the elastic tube 101 to the outside of the housing 1. The movable electrode sheet 6 at the bottom of the sheet 4, the fifth insulating sheet 7 provided below the fourth insulating sheet 5 and connected to the fourth insulating sheet 5 by a sealant 71, the fixed electrode sheet 8 provided on the top of the fifth insulating sheet 7, a conductive member 10 provided in the stress isolation groove 104 and electrically connected to the movable electrode sheet 6 at one end and extending to the outside of the shell 1 at the other end, a fixed electrode lead 11 electrically connected to the fixed electrode sheet 8 and extending to the outside at the lower end, an NTC thermistor 13 wrapped by a thermally conductive gel 12 and provided in the stress isolation groove 104, and a connecting wire 15 with one end electrically connected to the NTC thermistor 13 and the other end extending to the outside of the shell 1, the movable electrode sheet 6 corresponds to the fixed electrode sheet 8 up and down and maintains a gap, and constitutes a measuring capacitor.

[0027] When the fluid medium enters from the upper end of the pressure channel 103, the pressure generated by the fluid medium is transmitted to the upper carrier 102. The carrier 102 is subjected to pressure, which causes the elastic tube 101 to produce elastic deformation. Since the elastic tube 101 is a thin-walled cylindrical structure, the carrier 102 moves up and down with the deformation of the elastic tube 101, changing the distance between the movable electrode sheet 6 and the fixed electrode sheet 8, causing the capacitance to change. By measuring the change in capacitance, the pressure of the fluid medium being measured can be measured, and the temperature change can be measured through the NTC thermistor 13.

[0028] The housing 1 is made of aluminum, aluminum alloy, stainless steel or other materials. In this embodiment, the housing 1 is preferably made of stainless steel.

[0029] The first insulating sheet 2, the third insulating sheet 4, the movable electrode sheet 6, and the fixed electrode sheet 8 have a circular structure, an elliptical structure, a quadrilateral structure, or a hexagonal structure. In this embodiment, preferably, 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 second insulating sheet 3 and the fourth insulating sheet 5 have a circular ring structure or a C-shaped structure. In this embodiment, preferably, the second insulating sheet 3 and the fourth insulating sheet 5 both have a circular ring structure. The fifth insulating sheet 7 has a circular structure, a quadrilateral structure, or a hexagonal structure. In this embodiment, preferably, the fifth insulating sheet 7 has a circular structure.

[0030] The conductive member 10 is made of a flexible material. Furthermore, the conductive member 10 is a copper wire or a long copper sheet. The conductive member 10 is placed in a bent shape within the stress isolation groove 104. A gap is maintained between the bent portion of the conductive member 10 and the carrier 102 to prevent contact with the bent portion during the vertical movement of the carrier 102, which could cause measurement inaccuracies. One end of the conductive member 10 passes through the adhesive 2 N2 between the first insulating sheet 2 and the third insulating sheet 4 and through a through-hole in the third insulating sheet 4 to electrically connect to the movable electrode sheet 6. The other end of the conductive member 10 passes through the adhesive 2 N2 between the second insulating sheet 3 and the fourth insulating sheet 5 and extends to the exterior of the housing 1, forming a movable electrode lead 1011.

[0031] A support member 16 is provided between the fourth insulating sheet 5 and the fifth insulating sheet 7. The support member 16 includes an upper support member 161 formed by a metal coating plated on the bottom of the fourth insulating sheet 5 and a lower support member 162 formed by a metal coating plated on the top of the fifth insulating sheet 7. The upper support member 161 is in surface contact with the lower support member 162. The upper support member 161 and the lower support member 162 are in a circular ring structure or a C-shaped structure. In this embodiment, the upper support member 161 and the lower support member 162 are preferably in a circular structure. The upper support member 161 is at the same height as the movable electrode sheet 6, and the top surface of the lower support member 162 is higher than the top surface of the fixed electrode sheet 8.

[0032] The upper end of the connecting wire 15 is wrapped by the thermal conductive gel 12 , and the lower end passes through the adhesive N2 between the second insulating sheet 3 and the fourth insulating sheet 5 and extends to the outside of the housing 1 to form the NTC lead 151 .

[0033] 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.

[0034] Adhesive 1 N1 and adhesive 2 N2 are both low linear expansion coefficient epoxy resin glue or low temperature sintered glass.

[0035] The above are only some embodiments of the present invention. For ordinary technicians in this field, several modifications and improvements can be made without departing from the creative concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A new type of pressure and temperature composite sensor, characterized in that: include: A shell, an elastic tube connected to the shell, a carrier located at the lower end of the elastic tube, a pressure channel, a stress isolation groove, a first insulating sheet connected to the bottom of the carrier by adhesive 1 and a second insulating sheet connected to the bottom of the shell, a third insulating sheet connected to the bottom of the first insulating sheet by adhesive 2 and a fourth insulating sheet connected to the bottom of the second insulating sheet, a movable electrode sheet arranged at the bottom of the third insulating sheet, a fifth insulating sheet connected to the fourth insulating sheet by sealant, a fixed electrode sheet arranged at the top of the fifth insulating sheet, a conductive member with one end electrically connected to the movable electrode sheet and the other end extending to the outside of the shell and having a bend in the corresponding part of the stress isolation groove, and a fixed electrode lead electrically connected to the fixed electrode sheet, the movable electrode sheet corresponds to the fixed electrode sheet up and down and maintains a gap.

2. A novel pressure-temperature composite sensor according to claim 1, characterized in that: The conductive member is a copper wire or a long copper sheet, and a gap is maintained between the bent portion of the conductive member and the carrier.

3. A novel pressure-temperature composite sensor according to claim 1, characterized in that: It also includes an NTC thermistor and a connecting wire. The NTC thermistor is arranged in the stress isolation groove and is wrapped by a thermal conductive gel. The upper end of the connecting wire is connected to the NTC thermistor, and the lower end passes through the adhesive between the second insulating sheet and the fourth insulating sheet and extends to the outside of the shell to form an NTC lead.

4. A novel pressure-temperature composite sensor according to claim 1, characterized in that: One end of the conductive member passes through the adhesive 2 between the first insulating sheet and the third insulating sheet and the through hole on the third insulating sheet to be electrically connected to the movable electrode sheet, and the other end of the conductive member passes through the adhesive 2 between the second insulating sheet and the fourth insulating sheet and extends to the part outside the shell to form a movable electrode lead.

5. The novel pressure-temperature composite sensor according to claim 1, characterized in that: The first insulating sheet, the third insulating sheet, the movable electrode sheet and the fixed electrode sheet are in a circular structure, an elliptical structure, a quadrilateral structure or a hexagonal structure, and the second insulating sheet and the fourth insulating sheet are in a circular ring structure or a C-shaped structure.

6. A novel pressure-temperature composite sensor according to claim 1, characterized in that: The fifth insulating sheet has a circular structure, a quadrilateral structure, or a hexagonal structure.

7. The novel pressure-temperature composite sensor according to claim 1, characterized in that: A support member is provided between the fourth insulating sheet and the fifth insulating sheet.

8. The novel pressure-temperature composite sensor according to claim 7, characterized in that: The support member includes an upper support member formed by a metal coating plated on the bottom of the fourth insulating sheet and a lower support member formed by a metal coating plated on the top of the fifth insulating sheet. The upper support member is in surface contact with the lower support member, the upper support member is at the same height as the movable electrode sheet, and the top surface height of the lower support member is higher than the top surface height of the fixed electrode sheet.

9. The novel pressure-temperature composite sensor according to claim 8, characterized in that: The upper support member and the lower support member are in a circular ring structure or a C-shaped structure.

10. The novel pressure-temperature composite sensor according to claim 1, characterized in that: The elastic tube is a thin-walled cylindrical structure.

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