CN114427886A

CN114427886A - Quick temperature-sensing square capacitive temperature and pressure sensor

Info

Publication number: CN114427886A
Application number: CN202210066966.XA
Authority: CN
Inventors: 何文超; 何俊
Original assignee: Xiaogan Huagong Gaoli Electron Co Ltd
Current assignee: Xiaogan Huagong Gaoli Electron Co Ltd
Priority date: 2022-01-20
Filing date: 2022-01-20
Publication date: 2022-05-03

Abstract

The invention provides a rapid temperature-sensing square capacitive temperature and pressure sensor which comprises a shell, a protective cover, a temperature sensing element, a supporting piece, a pressure sensing element, a flexible circuit board and an electric connector, wherein the electric connector and the shell are enclosed to form an accommodating cavity, the supporting piece is positioned in the accommodating cavity, a first groove for placing the pressure sensing element is formed in one end, close to the electric connector, of the supporting piece, the flexible circuit board is positioned between the pressure sensing element and the electric connector, one end, away from the electric connector, of the supporting piece is connected with the protective cover, the protective cover extends out of the shell, the temperature sensing element is positioned in the protective cover, and an opening for allowing an external medium to flow in to contact with the temperature sensing element is formed in one end, extending out of the shell, of the protective cover.

Description

Quick temperature-sensing square capacitive temperature and pressure sensor

Technical Field

The invention relates to the technical field of pressure sensors, in particular to a square capacitance type temperature and pressure sensor capable of sensing temperature quickly.

Background

Sensor technology is one of the important technologies of modern measurement and automation systems, and almost every technology cannot be separated from a sensor from the process control of production to the life of modern science and technology. Temperature and pressure sensors are two of the most widely used sensors in the sensor industry, and are often used together, especially in some places, temperature and pressure are measured at multiple positions, and the use of the temperature and pressure sensors alone makes the system more complicated and costly. The temperature and pressure sensor well solves the problem, and particularly shows unique charm in places with limited space. The temperature and pressure sensor is a novel sensor, conforms to the development requirement, can better meet the requirement of a customer, is a breakthrough in the sensor industry, and is a new research hotspot.

Existing temperature and pressure sensors, the temperature sensor element resides in a tubular element, which is a hollow metal probe filled with a thermally conductive material. The tubular element structure enables the temperature sensor element not to directly sense the temperature of the medium, the medium temperature is required to be firstly conducted to the metal probe and then conducted to the heat conduction material, and finally the temperature sensor element senses the temperature of the heat conduction material to transmit the temperature signal, so that the efficiency is low, and the response is not rapid and timely enough. After the tubular element is formed, the length of the tubular element cannot be changed at will, the tubular element is difficult to flexibly adapt to various environments, and if the length of the temperature sensing element needs to be adjusted, a mold needs to be opened again to manufacture the tubular element with a new specification, so that the cost is increased. Moreover, the existing temperature and pressure sensors are complex in assembly process.

Therefore, there is a need to design a new temperature and pressure sensor to overcome the above problems.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a temperature and pressure sensor which has the advantages of quick response of temperature signals, suitability for various environments, small component size, compact structure and convenient assembly.

The invention is realized by the following steps:

Furthermore, the temperature sensing element comprises a temperature sensing chip and a lead, a contact pin is arranged in the support piece, one end of the lead is electrically connected with the temperature sensing chip, the other end of the lead is coupled with the flexible circuit board through the contact pin, the electric connector is coupled with the flexible circuit board, and the pressure sensing element is coupled with the flexible circuit board through a clip.

Furthermore, the end face, facing the electrical connector, of the support piece is provided with a glue filling hole, and one end, coupled with the flexible circuit board, of the contact pin extends out of the glue filling hole.

Further, support piece deviates from the one end of electrical connector is equipped with a lug, the contact pin stretches out the lug with the lead wire links to each other, set up two semicircular groove of relative setting on the lug, the safety cover with be equipped with two semicircular bulge on the inside wall of the continuous one end of lug, semicircular bulge with semicircular groove one-to-one block.

Furthermore, one end of the protective cover connected with the convex block is provided with a V-shaped notch.

Furthermore, one end, extending out of the shell, of the protective cover is provided with a plurality of square notches along the circumferential direction, and the temperature sensing chip is close to the square notches.

Furthermore, the electric connector is provided with a limiting structure for limiting and fixing the support piece, and the support piece is provided with a buckle guide square groove for allowing the limiting structure to stretch into the clamping.

Furthermore, a positioning opening is formed in the side wall of one end, facing the support piece, of the electrical connector, the extending portion of the flexible circuit board extends into the positioning opening, and a limiting protrusion matched with the positioning opening and used for limiting and positioning the extending portion of the flexible circuit board is arranged on the support piece.

Further, casing one end is equipped with the casing thread connection end with external connection, casing thread connection end is equipped with the casing through hole that supplies the safety cover to stretch out, the other end of casing is equipped with casing open cavity, support piece, pressure-sensitive element, flexible circuit board are located in the casing open cavity, the shutoff of electrical connector the casing open cavity, casing open cavity orientation the second recess has been seted up on support piece's the terminal surface, the built-in first sealing member of second recess.

Furthermore, a gap for flowing in of an external medium is formed between the protective cover and the through hole of the shell, a third groove is formed in the end face, close to the protective cover, of the first groove, a medium hole for flowing in of the external medium to contact the pressure sensing element is formed in the third groove, a second sealing element is arranged in the third groove, and the second sealing element is arranged around the medium hole.

The invention has the following beneficial effects:

the temperature sensing element is directly contacted with an external medium under the protection of the protective cover, the response speed of the temperature signal is high, and the problems that the temperature sensing element in the traditional sensor structure is wrapped in a plastic or metal material to indirectly sense the temperature signal and the response speed of the temperature signal is low are solved; the length of the lead of the temperature sensing element is convenient to adjust, the temperature sensing range of the temperature sensing element can be rapidly changed only by changing the length of the protective cover, and the application range is wide; the pressure sensing element is a square capacitor, the volume is smaller than that of a round capacitor, the whole structure is compact, materials are saved, and the cost is saved; the flexible circuit board has a simple structure, and can be coupled with a pressure sensing element and a temperature sensing element to process pressure and temperature signals at the same time by changing the flexible circuit board into a complex structural form different from the traditional sensor; the electric connector and the support piece are of a limiting and fixed structural design, and during assembly, the protective cover, the temperature sensing element, the support piece, the pressure sensing element, the flexible circuit board and the electric connector can be assembled into a whole firstly and are directly installed in the opening cavity of the shell, so that the electric connector is simple to assemble and convenient for batch production.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is an exploded view of a fast temperature-sensing square capacitive temperature and pressure sensor according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a fast temperature-sensing square capacitive temperature and pressure sensor according to an embodiment of the present invention;

FIG. 3 is a first schematic view of a support member according to an embodiment of the present invention;

FIG. 4 is a second schematic view of a supporting member according to an embodiment of the present invention;

FIG. 5 is a schematic view of a protective cover according to an embodiment of the invention;

FIG. 6 is a schematic view of an electrical connector according to an embodiment of the present invention;

FIG. 7 is a three-dimensional schematic view of the combination of the support member, pressure-sensitive element and protective covering of the present invention;

FIG. 8 is a schematic view of the combination of the electrical connector, the flexible circuit board, the pressure sensitive element, the support member, the temperature sensitive element, and the protective cover of the present invention.

The reference numbers are given as: 1-a shell; 101-a housing threaded end; 102-a housing open cavity; 103-housing through hole; 2-a protective cover; 201-semicircular bulge; 202-V shaped notch; 203-square notch; 3-a temperature sensing element; 301-temperature sensing chip; 302-lead; 4-a first seal; 5-a support member; 501-inserting pins; 502-a support base; 503-semicircular groove; 504-snap guide square groove; 505-media pores; 506-a seal ring groove; 507-glue pouring holes; 508-square groove; 509-a limit bump; 6-clamping and buckling; 7-a second seal; 8-a pressure sensing element; 9-a flexible circuit board; 10-an electrical connector; 1001-limit structure; 1002-positioning the opening.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that if the present embodiment relates to directional indications (such as upper, lower, front, and rear … …), the directional indications are only used to explain the relative relationship between the components in a specific posture (as shown in the figure), and if the specific posture changes, the directional indications also change accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature.

Referring to fig. 1 to 8, an embodiment of the present invention provides a fast temperature-sensing square capacitive temperature and pressure sensor, including a housing 1, a protective cover 2, a temperature sensing element 3, a support member 5, a pressure sensing element 8, a flexible circuit board 9, and an electrical connector 10, where the electrical connector 10 and the housing 1 enclose a receiving cavity, the support member 5 is located in the receiving cavity, one end of the support member 5 near the electrical connector 10 is provided with a first groove (a square groove 508) for placing the pressure sensing element 8, the flexible circuit board 9 is located between the pressure sensing element 8 and the electrical connector 10, one end of the support member 5 away from the electrical connector 10 is connected to the protective cover 2, the protective cover 2 extends out of the housing 1, and the temperature sensing element 3 is located in the protective cover 2, one end of the protective cover 2 extending out of the shell 1 is provided with an opening for external media to flow in so as to contact the temperature sensing element 3.

The temperature sensing element 3 comprises a temperature sensing chip 301 and a lead 302, a pin 501 is arranged in the support member 5, one end of the lead 302 is electrically connected with the temperature sensing chip 301, the other end of the lead 302 is coupled (electrically connected) with the flexible circuit board 9 through the pin 501, the electrical connector 10 is coupled (electrically connected) with the flexible circuit board 9, the pressure sensing element 8 is coupled (electrically connected) with the flexible circuit board 9 through a clip 6, and the clip 6 is a clip-shaped conductive element. The outer layer of the temperature sensing chip 301 is wrapped with epoxy resin which can be exposed in external media, and the lead and the contact pin are wrapped with medium-resistant materials.

The end face, facing the electrical connector 10, of the support piece 5 is provided with a glue filling hole 507, the glue filling hole 507 is filled with sealant, the sealing performance is enhanced, and one end, coupled with the flexible circuit board 9, of the contact pin 501 extends out of the glue filling hole 507. Support piece 5 deviates from the one end of electrical connector 10 is equipped with a lug, contact pin 501 stretches out the lug with lead wire 302 links to each other, set up two semicircular groove 503 of relative setting on the lug, safety cover 2 with be equipped with two semicircular bulge 201 on the inside wall of the continuous one end of lug, semicircular bulge 201 with semicircular groove 503 one-to-one block. The one end that safety cover 2 with the lug links to each other is equipped with V-arrangement breach 202, is convenient for safety cover 2 with the equipment cooperation of support piece 5. The protective cover 2 extends out one end of the shell 1 is provided with a plurality of square notches 203 along the circumferential direction, and the temperature sensing chip 301 is close to the square notches 203.

The electrical connector 10 is provided with a limiting structure 1001 for limiting and fixing the support member 5, and the support member 5 is provided with a buckle guide square groove 504 for allowing the limiting structure 1001 to extend into the buckle. The side wall of the electrical connector 10 facing one end of the support member 5 is provided with a positioning opening 1002, the extending portion of the flexible circuit board extends into the positioning opening 1002, the support member 5 is provided with a limiting protrusion 509 which is matched with the positioning opening 1002 to limit and position the extending portion of the flexible circuit board, and the limiting protrusion 509 extends into the positioning opening 1002 to tightly push the extending portion of the flexible circuit board.

The utility model discloses a casing, including casing 1, casing threaded connection end 101, electrical connector 10, support piece 5, pressure-sensitive element 8, flexible circuit board 9, electrical connector 102, casing threaded connection end 101, casing threaded connection end is equipped with the casing through hole 103 that supplies safety cover 2 to stretch out, the other end of casing 1 is equipped with casing open chamber 102, support piece 5, pressure-sensitive element 8, flexible circuit board 9 are located in casing open chamber 102, casing open chamber 102 orientation the second recess has been seted up on support piece 5's the terminal surface, the built-in first sealing member 4 of second recess makes and forms the isolation medium passageway between casing and the support piece. A gap for the inflow of an external medium is formed between the protective cover 2 and the shell through hole 103, a third groove (a seal ring groove 506) is formed in the end face, close to the protective cover 2, of the first groove, a medium hole 505 for the inflow of the external medium to contact the pressure sensing element 8 is formed in the third groove, a second sealing element 7 is arranged in the third groove, so that the pressure of the external medium can be transmitted to a pressure sensing area of the pressure sensing element through the medium hole and limited in the pressure sensing area and cannot flow to other areas, the product performance is affected, and the second sealing element 7 is arranged around the medium hole 505.

During assembly, the protective cover 2, the temperature sensing element 3, the supporting piece 5, the clamping buckle 6, the second sealing piece 7, the pressure sensing element 8, the flexible circuit board 9 and the electric connector 10 are assembled together, and then are directly installed in the shell 1 with the first sealing piece 4, so that the assembly is convenient and efficient.

A quick temperature-sensing square capacitive temperature and pressure sensor comprises a shell, a protective cover, a temperature sensing element, a supporting piece, a clamp fastener, a pressure sensing element, a flexible circuit board, an electrical connector and the like. One end of the shell is in a thread form and is connected with the outside, and the other end of the shell is an open cavity; one end of the protective cover is matched with the supporting piece and sleeved outside the temperature sensing element to play a role in protecting the temperature sensing element, and the other end of the protective cover penetrates through the opening cavity; the temperature sensing element is welded with the lower end contact pin of the support piece and extends out of the opening of the threaded connecting end of the shell; the supporting piece is provided with a medium channel, so that the external medium pressure can be transmitted to the pressure sensing area of the pressure sensing element; the support part is provided with a square groove for placing the pressure sensing element, a sealing part is arranged between the pressure sensing element and the support part, and a sealing part is arranged between the lower end of the support part and the shell for limiting the flowing area of an external medium in the shell; two contact pins extend out of the upper end of the supporting piece, are coupled with the flexible circuit board and transmit temperature signals; the pressure sensing element is arranged in the supporting piece, is coupled with the flexible circuit board and transmits a pressure signal; one end of the flexible circuit board is coupled with the temperature sensing element and the pressure sensing element to process and convert the temperature signal and the pressure signal, and the other end of the flexible circuit board is coupled with the electrical connector; the electric connector is designed with a limiting structure, and can limit and fix the supporting piece.

Preferably, the housing is a generally metal housing having a threaded end for connection to the exterior and an open cavity at the other end for receiving the support member, the pressure sensitive element, the flexible circuit board and a portion of the electrical connector.

Preferably, the protective cover is of a tubular structure, a semicircular protruding structure is arranged on the inner wall of one end of the protective cover, deep V-shaped notches are formed in two sides of the protective cover and are conveniently matched and connected with the semicircular groove in the lower portion of the supporting piece, and a square notch is formed in the side wall of the other end of the protective cover and is convenient for an external medium to contact with the temperature sensing element, so that the response speed of a temperature signal is improved.

Preferably, the temperature sensing element comprises a temperature sensing chip and a lead, wherein the temperature sensing chip can be a thermistor and other sensitive parts, extends out of the opening end of the shell thread and senses a temperature signal; the lead wire extends from the temperature sensing chip and is welded with the lower end contact pin of the support piece.

Preferably, the inner end face of the open cavity of the shell is provided with a groove, and a first sealing member is arranged in the groove, so that an isolating medium channel is formed between the shell and the support member.

Preferably, the support member includes a support base and a pin, and the support base and the pin are integrally formed.

Preferably, the upper end surface of the supporting base is provided with a square groove for accommodating the pressure sensing element.

Preferably, a circular groove is formed below the square groove of the supporting base, a medium hole is formed in the circular groove, and the second sealing element is arranged in the circular groove, so that external medium pressure can be transmitted to the pressure sensing area of the pressure sensing element through the medium hole and limited in the pressure sensing area and cannot flow to other areas to influence the performance of the product.

Preferably, the lower part of the supporting base is provided with a semicircular groove structure which is connected with the protective cover.

Preferably, the upper end face of the support base is provided with a limiting convex structure which is matched with the side positioning opening structure of the electric connector to limit and position the extending part of the flexible circuit board.

Preferably, the two sides of the support base are provided with guide buckle square grooves which are matched with the limit structure of the electric connector to play the role of limiting and fixing.

Preferably, the contact pin is fixed in the support base, the lower end of the contact pin is welded with the temperature sensing element and communicated with the temperature sensing element, and the upper end of the contact pin is coupled with the flexible circuit board to transmit temperature signals.

Preferably, the pressure sensing element is of a square structure, is small in size and is arranged in the support. The lower end of the pressure sensing element is a pressure sensing area which can sense pressure signals.

Preferably, the pressure sensing element and the flexible circuit board are coupled through the clip to transmit a pressure signal.

Preferably, one end of the flexible circuit board is arranged on the pressure sensing element, is coupled with the temperature sensing element and the pressure sensing element, processes the temperature signal and the pressure signal at the same time, processes and converts the temperature signal and the pressure signal, and the other end of the flexible circuit board is coupled with the electrical connector to output the temperature signal and the pressure signal.

Preferably, the protective cover, the temperature sensing element, the support member, the pressure sensing element, the flexible circuit board, the electrical connector and the like may be assembled into a single body and then installed in the opening of the housing, so that the assembly is simple.

As shown in fig. 1-4, the present embodiment provides a square capacitive temperature and pressure sensor with fast temperature sensing, which mainly includes a housing 1, a protective cover 2, a temperature sensing element 3, a supporting member 5, a clip 6, a pressure sensing element 8, a flexible circuit board 9, an electrical connector 10, and the like. One end of the shell 1 is a shell threaded connection end 101 and is connected with the outside, a shell through hole 103 is formed in the threaded connection end 101 of the shell 1, a medium can enter the shell 1 through the through hole 103 in the threaded connection end 101, and the other end of the shell is an open cavity (a shell open cavity 102); one end of the protective cover 2 is matched with the supporting piece 5 and sleeved outside the temperature sensing element 3 to play a role in protecting the temperature sensing element 3, and the other end of the protective cover extends to the outside of the threaded connection end 101 of the shell 1; the lead 302 of the temperature sensing element 3 is welded with the pin 501 of the support 5, and the temperature sensing chip 301 is arranged outside the threaded end 101 of the shell 1 according to the length of the lead 302 and senses the temperature of an external medium; in this embodiment, the temperature sensing chip 301 is a thermistor, and may be another temperature sensing sensitive component; the first sealing element 4 is arranged in an opening cavity of the shell 1, so that an isolated medium channel is formed between the shell 1 and the supporting element 5, and the influence on the precision caused by the interference of external media on the electrical connection is prevented; in this embodiment, the first sealing element 4 is an O-ring made of hydrogenated nitrile rubber or other high/low temperature resistant and corrosion resistant materials; the supporting member 5 is provided with a medium hole 505, so that the external medium pressure can be transmitted to the pressure sensing area of the pressure sensing element 8; the support piece 5 is provided with a square groove 508 for accommodating the pressure sensing element 8; the supporting piece 5 is provided with a sealing ring groove 506, a second sealing piece 7 is arranged in the sealing ring groove, so that an isolation medium channel is formed between the supporting piece 5 and the pressure sensing element 8, and the second sealing piece 7 is also an O-shaped sealing ring and is made of hydrogenated nitrile rubber or other high-low temperature resistant and corrosion resistant materials; the contact pin 501 of the support member 5 is coupled with the flexible circuit board 9, and transmits the temperature signal sensed by the temperature sensing chip 301; the flexible circuit board 9 is made of PI (polyimide) in this embodiment, and has the characteristics of high reliability, excellent flexible printed circuit board, high wiring density, light weight, thin thickness and good bending performance, one end of the flexible circuit board 9 is coupled with the temperature sensing element 3 and the pressure sensing element 8 to process and convert temperature signals and pressure signals, and the other end of the flexible circuit board is coupled with the electrical connector 10 to output temperature and pressure signals. In the present embodiment, the flexible circuit board 9 and the pressure sensing element 8 are coupled by soldering through the clip 6, and other suitable coupling forms may be applicable.

As shown in fig. 2 to 6, the supporting member 5 is composed of a pin 501 and a supporting base 502, in this embodiment, the pin 501 is made of a metal material with certain strength and corrosion resistance, and the base 502 is made of a plastic material with high and low temperature resistance, corrosion resistance and certain strength; the contact pin 501 and the support base 502 are integrally formed in an injection molding mode, extra processing is not needed, and the size precision is high; the upper end face of the supporting base 502 is provided with a glue filling hole 507, and sealant can be filled in the glue filling hole 507 to enhance the sealing property; the limiting convex structures 509 on the upper end surface of the supporting base 502 are matched with the positioning openings 1002 of the electric connector 10 to position the extending part of the flexible circuit board 9; a buckle guide square groove 504 is designed on the side edge of the support base 502, and the buckle guide square groove 504 can be connected with a limiting structure 1001 of the electrical connector 10 in a clamping manner to play roles of fixing and limiting; the semicircular groove structure 503 at the lower part of the support base 502 is connected with the semicircular bulge structure 201 of the protective cover 2, and the matching is reliable; the protective cover 2 is designed with a V-shaped notch 202 structure, so that the protective cover 2 and the support 5 are convenient to assemble and match; the lower end of the protective cover 2 is provided with a square notch 203, so that an external medium can be in contact with the temperature sensing chip 301 better, and the temperature response speed is further improved.

As shown in fig. 7, the pressure sensing element 8 is disposed in the supporting member 5, in this embodiment, the pressure sensing element 8 is a square ceramic capacitive sensor element, and is made of a material such as ceramic or metal, and the square ceramic capacitive sensor element has a smaller volume than a circular ceramic capacitive sensor element, so that the space and the cost are saved. Although the pressure sensing element 8 is a square ceramic capacitive sensor element in the present embodiment, any suitable type of pressure sensor element may be suitable.

As shown in fig. 1 to 8, the protective cover 2 is tightly connected to the supporting member 5, the second sealing member 7 and the pressure-sensitive element 8 are disposed inside the supporting member 5, one end of the flexible circuit board 9 is coupled to the contact pin 501 and the pressure-sensitive element 8, the other end is coupled to the electrical connector 10, and the electrical connector 10 and the supporting member 5 are snap-connected together.

Details not described in this specification are within the skill of the art that are well known to those skilled in the art.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a square capacitanc temperature pressure sensor of quick temperature sensing which characterized in that: including casing, safety cover, temperature-sensing element, support piece, forced induction component, flexible circuit board, electrical connector with the casing encloses into one and accepts the cavity, support piece is located accept in the cavity, support piece is close to electrical connector's one end is equipped with places forced induction component's first recess, flexible circuit board is located forced induction component with between the electrical connector, support piece deviates from electrical connector's one end with the safety cover links to each other, the safety cover stretches out the casing, temperature-sensing element is located in the safety cover, the safety cover stretches out the one end of casing is equipped with the opening that supplies external medium to flow in with contact temperature sensing element.

2. The square capacitive temperature and pressure sensor of claim 1, wherein: the temperature sensing element comprises a temperature sensing chip and a lead, a contact pin is arranged in the support piece, one end of the lead is electrically connected with the temperature sensing chip, the other end of the lead is coupled with the flexible circuit board through the contact pin, the electric connector is coupled with the flexible circuit board, and the pressure sensing element is coupled with the flexible circuit board through a clamp.

3. The square capacitive temperature and pressure sensor of claim 2, wherein: the support piece faces the end face of the electrical connector and is provided with a glue filling hole, and one end of the contact pin coupled with the flexible circuit board extends out of the glue filling hole.

4. The square capacitance temperature pressure sensor of quick temperature sensing of claim 3, characterized in that: the support piece deviates from the one end of electrical connector is equipped with a lug, the contact pin stretches out the lug with the lead wire links to each other, set up two semicircular groove of relative setting on the lug, the safety cover with be equipped with two semicircle archs on the inside wall of the continuous one end of lug, semicircle arch with semicircular groove one-to-one block.

5. The square capacitive temperature and pressure sensor of claim 4, wherein: and a V-shaped notch is formed in one end, connected with the lug, of the protective cover.

6. The square capacitive temperature and pressure sensor of claim 5, wherein: the protective cover stretches out one end of the shell is provided with a plurality of square notches along the circumferential direction, and the temperature sensing chip is close to the square notches.

7. The square capacitive temperature and pressure sensor of claim 1, wherein: the electric connector is provided with a limiting structure for limiting and fixing the supporting piece, and the supporting piece is provided with a buckle guide square groove for allowing the limiting structure to stretch into the clamping.

8. The square capacitance-type temperature and pressure sensor of quick temperature sensing of claim 1, characterized in that: the electric connector is provided with a positioning opening on the side wall facing one end of the support piece, the extending part of the flexible circuit board extends into the positioning opening, and the support piece is provided with a limiting bulge which is matched with the positioning opening and used for limiting and positioning the extending part of the flexible circuit board.

9. The square capacitive temperature and pressure sensor of claim 1, wherein: casing one end is equipped with the casing thread connection end with external connection, casing thread connection end is equipped with the casing through hole that supplies the safety cover to stretch out, the other end of casing is equipped with casing opening chamber, support piece, pressure-sensitive element, flexible circuit board are located in the casing opening chamber, the shutoff of electrical connector the casing opening chamber, casing opening chamber orientation the second recess has been seted up on support piece's the terminal surface, the built-in first sealing member of second recess.

10. The rapid temperature-sensing square capacitive temperature and pressure sensor according to claim 9, wherein: the protective cover and the shell through hole are provided with a gap for external media to flow in, the first groove is close to the end face of the protective cover, a third groove is formed in the end face of the protective cover, a medium hole for external media to flow in to contact the pressure sensing element is formed in the third groove, a second sealing element is arranged in the third groove, and the second sealing element is arranged around the medium hole.