High-protection temperature and pressure sensor

Abstract

Provided in the present application is a high-protection temperature and pressure sensor, comprising a housing, a temperature sensing element, a support member, a pressure sensing element, a flexible printed circuit and an electrical connector, wherein the electrical connector and the housing define an accommodating cavity; the temperature sensing element, the support member and the flexible printed circuit are sequentially arranged in the accommodating cavity in a direction from the housing to the electrical connector; an accommodating recess is provided at the end of the support member that faces the flexible printed circuit; the pressure sensing element is located in the accommodating recess; a columnar temperature sensing section is provided at the end of the housing that faces away from the electrical connector; the temperature sensing element extends into the columnar temperature sensing section; the columnar temperature sensing section is filled with a thermally conductive adhesive; first medium holes allowing an external medium to flow toward the pressure sensing element are provided in the housing; second medium holes allowing the external medium to flow toward the pressure sensing element are provided in the support member; each first medium hole is in communication with the corresponding second medium hole; the temperature sensing element and the pressure sensing element are both electrically connected to the flexible printed circuit; and the flexible printed circuit is electrically connected to the electrical connector.

Description

High-protection temperature and pressure sensor

[0001] The present application claims priority to the Chinese patent application No. CN202410643467.1, filed on May 23, 2024, and entitled "High-protection temperature and pressure sensor", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of pressure sensor, in particular to a high-protection temperature and pressure sensor. BACKGROUND

[0003] Sensor technology is one of the important technologies of modern measurement and automation systems, from process control in production to modern technological life, almost every technology cannot do without sensors. Temperature and pressure sensors can be said to be the two most widely used sensors in the sensor industry, often need to be used together, especially in some places need to measure temperature and pressure in multiple places, the use of temperature and pressure sensors alone will make the system more complex, and the cost is also higher. The temperature and pressure sensor solves this problem very well, especially in limited space, the temperature and pressure sensor shows its unique charm. As a new type of sensor, the temperature and pressure sensor meets the needs of development, not only can better meet the needs of customers, but also is a breakthrough in the sensor industry, a new research hotspot.

[0004] In order to improve the response speed of temperature, the temperature sensing element is often exposed to the medium environment in the design of the existing temperature and pressure sensor, but this scheme is not suitable for the environment where the medium is water and other conductive media, which will cause the temperature sensing element to fail; other water-resistant structures such as temperature sensing elements wrapped in plastic can resist water and other conductive media, but the temperature response time is longer and cannot quickly respond to temperature changes.

[0005] Therefore, it is necessary to design a new temperature and pressure sensor which can be applied to various medium environments, has high protection, small component size, compact structure and fast temperature response time.

[0006] SUMMARY

[0007] The present application aims to overcome the defects of the prior art and provides a high-protection temperature and pressure sensor, which at least solves some problems in the prior art.

[0008] The present application is implemented as follows:

[0009] The application provides a high-protection temperature pressure sensor, which comprises a shell, a temperature sensing element, a support, a pressure sensing element, a flexible circuit board and an electrical connector electrically connected with an external circuit, the electrical connector and the shell form a containing cavity, the temperature sensing element, the support and the flexible circuit board are sequentially arranged in the containing cavity from the shell to the electrical connector, an accommodation groove is formed in one end of the support facing the flexible circuit board, the pressure sensing element is located in the accommodation groove, a columnar temperature sensing section is arranged at one end of the shell away from the electrical connector, the temperature sensing element extends into the columnar temperature sensing section, the columnar temperature sensing section is filled with heat-conducting glue, a first medium hole is formed in the shell for allowing external medium to flow to the pressure sensing element, a second medium hole is formed in the support for allowing external medium to flow to the pressure sensing element, the first medium hole is communicated with the second medium hole, the temperature sensing element and the pressure sensing element are electrically connected with the flexible circuit board, and the flexible circuit board is electrically connected with the electrical connector.

[0010] Further, a rectangular protrusion is arranged at one end of the support away from the flexible circuit board, a rectangular groove is arranged on the inner wall of the shell and matched with the rectangular protrusion, and the columnar temperature sensing section is opposite to the rectangular groove.

[0011] Further, a pin is arranged on the support, the temperature sensing element is electrically connected with the flexible circuit board through the pin, and the pin extends from the rectangular protrusion.

[0012] Further, the first medium hole and the second medium hole are both two, the first medium hole is one-to-one corresponding to the second medium hole, and the two second medium holes are located on the two sides of the rectangular protrusion.

[0013] Further, two sealing grooves are arranged on the inner wall of the shell, the first medium hole is one-to-one corresponding to the sealing groove, the two sealing grooves are located on the two sides of the rectangular groove, the first medium hole is communicated with the second medium hole through the sealing groove, and a first sealing ring is arranged in each sealing groove.

[0014] Further, a second sealing ring is arranged in the accommodation groove, the second sealing ring surrounds the two second medium holes, and the second sealing ring is located on the side of the pressure sensing element away from the flexible circuit board.

[0015] Further, the columnar temperature sensing section is in a stepped shaft structure, comprising a small-diameter section and a large-diameter section for installation, the small-diameter section and the large-diameter section are sequentially arranged from the shell to the electrical connector, the temperature sensing element extends into the small-diameter section, a first groove is arranged on the outer wall of the large-diameter section, the first groove surrounds the large-diameter section, and a third sealing ring is arranged in the first groove.

[0016] Further, a second groove is arranged on the outer wall of the large-diameter section, the second groove is arranged around the large-diameter section, and the first groove and the second groove are arranged in sequence and are spaced apart in the direction from the shell to the electrical connector.

[0017] Further, the shell comprises a plastic part and a metal thin ring, the metal thin ring is integrally injection molded with the plastic part, the metal thin ring is arranged at one end of the shell facing the electrical connector, one end of the metal thin ring outside the plastic part is provided with a bending part pressing the electrical connector, and one end of the metal thin ring inside the plastic part is provided with a Z-shaped bending part.

[0018] Further, the electrical connector is provided with a limiting structure for limiting and fixing a support, the limiting structure is located in the accommodation cavity, the support is provided with a limiting groove matched with the limiting structure, the limiting groove is provided with a buckle, and the limiting structure is provided with a buckle groove matched with the buckle.

[0019] The present application has the following beneficial effects:

[0020] 1. The first sealing ring limits the external medium, so that the external medium can only move to the pressure sensing end of the pressure sensing element, the temperature sensing element does not contact the medium, and the risk of temperature sensing failure caused by contact between the temperature sensing element and some external medium with conductivity can be prevented.

[0021] 2. In the present application, the temperature sensing element is located in the shell filled with heat-conducting glue, which can be applied to various medium environments, has high protection, and has fast temperature response time.

[0022] 3. The diameter and height of the pressure sensing element are reduced, the pressure sensing element is installed inside the support, the structure is more compact, the overall size of the temperature and pressure sensor is reduced, the pressure sensing end of the pressure sensing element contacts the second sealing ring, the second sealing ring is made of rubber material, and the pressure sensing end of the pressure sensing element is not affected during the process of extrusion between the pressure sensing element and the second sealing ring to form a sealing force, so that the product precision is not deviated.

[0023] 4. The main material of the shell is plastic, the upper bending part is metal material, the metal injection molding process is adopted, one metal part is reduced, the product is integrally formed without machining, the production cost is reduced, the assembly process is simplified, and the efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0025] Fig. 1 is a cross-sectional view of a high-protection temperature and pressure sensor according to an embodiment of the present application;

[0026] Fig. 2 is an exploded view of a high-protection temperature and pressure sensor according to an embodiment of the present application;

[0027] Fig. 3 is a schematic view of a housing according to an embodiment of the present application;

[0028] Fig. 4 is a schematic view of a support according to an embodiment of the present application.

[0029] The reference signs are shown as follows: 1-housing; 2-temperature sensing element; 3-thermally conductive glue; 4-first sealing ring; 5-support; 6-second sealing ring; 7-pressure sensing element; 8-flexible circuit board; 9-electrical connector; 10-metal thin circular ring; 11-first groove; 12-second groove; 13-first medium hole; 14-second medium hole; 15-rectangular protrusion. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort fall within the scope of protection of the present application.

[0031] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0032] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features; in the description of the present application, unless otherwise stated, the meaning of "several" is two or more.

[0033] As shown in FIG. 1-4, the application provides a high protection temperature and pressure sensor, which comprises a shell 1, a temperature sensing element 2, a support 5, a pressure sensing element 7, a flexible circuit board 8, and an electrical connector 9 electrically connected with an external circuit. The electrical connector 9 and the shell 1 form a receiving cavity. The temperature sensing element 2, the support 5, and the flexible circuit board 8 are sequentially arranged in the receiving cavity from the shell 1 to the electrical connector 9. The support 5 is provided with a receiving groove at one end facing the flexible circuit board 8, and the pressure sensing element 7 is arranged in the receiving groove. The shell 1 is provided with a columnar temperature sensing section at one end away from the electrical connector 9, and the temperature sensing element 2 extends into the columnar temperature sensing section. The columnar temperature sensing section is filled with a heat-conducting glue 3, which accelerates the thermal response speed of the temperature sensing element 2, fixes the temperature sensing element 2, and enhances the stability of the product. The shell 1 is provided with a first medium hole 13 for allowing external medium to flow to the pressure sensing element 7. The support 5 is provided with a second medium hole 14 for allowing external medium to flow to the pressure sensing element 7. The first medium hole 13 and the second medium hole 14 are in communication. The temperature sensing element 2 and the pressure sensing element 7 are electrically connected with the flexible circuit board 8, respectively transmitting temperature signals and pressure signals to the flexible circuit board 8. The flexible circuit board 8 is electrically connected with the electrical connector 9. In the application, the temperature sensing element is arranged in the shell filled with the heat-conducting glue, which is applicable to various medium environments, has high protection, and has fast temperature response time.

[0034] As shown in FIG. 1 and FIG. 4, in the embodiment, the support 5 is provided with a rectangular protrusion 15 at one end away from the flexible circuit board 8. The inner wall of the shell 1 is provided with a rectangular groove matched with the rectangular protrusion 15, and the columnar temperature sensing section is opposite to the rectangular groove. The rectangular protrusion 15 and the rectangular groove in the shell 1 are matched, so that the shell 1 and the support 5 are matched in a fixed direction, preventing the corresponding medium holes of the shell 1 and the support 5 from leaking due to misalignment. Meanwhile, the matching of the rectangular protrusion 15 of the shell 1 and the support 5 can prevent the electrical connector 9 from rotating after the shell 1 is bent, thereby preventing the product from being affected by poor precision. The support 5 is provided with a pin, the temperature sensing element 2 is electrically connected with the flexible circuit board 8 through the pin, the top end of the pin extends out of the support 5 and is welded with the flexible circuit board 8, and the bottom end of the pin extends out of the rectangular protrusion 15, and the temperature sensing element 2 is welded with the pin.

[0035] In the embodiment, the first medium hole 13 and the second medium hole 14 are both two, the first medium hole 13 and the second medium hole 14 correspond one by one, and the two second medium holes 14 are located on the two sides of the rectangular protrusion 15 respectively. Two sealing grooves are arranged on the inner wall of the shell 1, the first medium hole 13 and the sealing groove correspond one by one, and the two sealing grooves are located on the two sides of the rectangular groove respectively. The first medium hole 13 communicates with the second medium hole 14 through the sealing groove, and a first sealing ring 4 is arranged in each sealing groove. As shown in FIG. 1, the first sealing ring 4 enables the external medium to enter the product only after entering the pressure sensing end of the pressure sensing element 7, and cannot overflow to the electrical connection part of the product and the temperature sensing element 2, thereby preventing the external medium from corroding the temperature sensing element and causing the risk of poor temperature sensing.

[0036] As shown in FIGS. 1-2, a second sealing ring 6 is arranged in the receiving groove of the support 5, the second sealing ring 6 surrounds the two second medium holes 14, and the second sealing ring 6 is located on the side of the pressure sensing element 7 away from the flexible circuit board 8. The cross section of the second sealing ring 6 is rectangular, the rectangular sealing ring has the advantages of good stability and strong anti-extrusion performance, the pressure sensing element 7 can be stably placed, and the rectangular sealing ring can be used to support the pressure sensing element 7, thereby avoiding the risk that the pressure sensing end of the pressure sensing element 7 is in contact with metal or plastic and generates a large extrusion stress to cause deviation of the pressure precision measurement. The pressure sensing element 7 is arranged in the receiving groove of the support 5, and the overall structure is more compact, thereby reducing the overall size of the product.

[0037] The side of the pressure sensing element 7 away from the flexible circuit board 8 is the sensing end of the pressure sensing element 7, and the external medium flows to the sensing end of the pressure sensing element 7 through the first medium hole 13 and the second medium hole 14.

[0038] As shown in FIGS. 1-3, in the embodiment, the cylindrical temperature sensing section of the shell 1 has a stepped shaft structure, including a small diameter section and a large diameter section for mounting. The small diameter section and the large diameter section are arranged in sequence along the direction from the shell 1 to the electrical connector 9, the temperature sensing element 2 extends into the small diameter section, a first groove 11 is arranged on the outer wall of the large diameter section, the first groove 11 surrounds the large diameter section, a third sealing ring is arranged in the first groove 11, and the first groove 11 plays a sealing role. A second groove 12 is also arranged on the outer wall of the large diameter section, the second groove 12 surrounds the large diameter section, the first groove 11 and the second groove 12 are arranged in sequence and are spaced apart along the direction from the shell 1 to the electrical connector 9, and a clamping spring for mounting and fixing is arranged in the second groove 12.

[0039] As shown in FIG. 1-3, in the present embodiment, the shell 1 comprises a plastic part and a metal thin ring 10, which is integrally injection molded with the plastic part, and is arranged at one end of the shell 1 facing the electrical connector 9. The end of the metal thin ring 10 outside the plastic part is provided with a bent part pressing the electrical connector 9, and the end of the metal thin ring 10 inside the plastic part is provided with a Z-shaped bent part, which facilitates close combination with the plastic part.

[0040] As shown in FIG. 2, in the present embodiment, the electrical connector 9 is provided with a limiting structure for limiting and fixing the support 5, which is arranged in the accommodating cavity. The support 5 is provided with a limiting groove matched with the limiting structure, and the limiting groove is provided with a buckle. The limiting structure is provided with a buckle groove matched with the buckle.

[0041] As shown in FIG. 1-2, one end of the shell 1 is a columnar structure, and the outer side of the columnar structure has two groove structures matched with external machinery. The first groove 11 near the lower end is a sealing ring groove, and an external sealing ring is arranged to form a radial seal with the client to prevent medium overflow. The second groove 12 is a clasp spring groove, and the clasp spring fixes the product with the external mechanical end.

[0042] As shown in FIG. 1-3, the shell 1 and the metal thin ring 10 are integrally injection molded. The main material is plastic material with high and low temperature resistance, corrosion resistance and certain strength. The lower end of the metal thin ring 10 is a Z-shaped structure with a step, so that the contact area of the metal thin ring and the plastic is larger, and the metal thin ring 10 has certain strength during the integrally injection molding process with the plastic, so that it can remain stable in the plastic. The upper end of the metal thin ring 10 extends out of the plastic shell by a certain length. During assembly, the support 5, the pressure sensing element 7 and the electrical connector 9 are fixed by bending treatment, and the first and second sealing rings are extruded to form a certain sealing force for sealing.

[0043] The contents not described in detail in the present specification belong to the prior art known to those skilled in the art.

[0044] The above only describes the preferred embodiments of the present application and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A high overpressure temperature pressure sensor characterized by: The temperature sensing element, the support, the flexible circuit board, and the electrical connector are sequentially arranged in the accommodating cavity from the shell to the electrical connector, an accommodation groove is formed in one end of the support facing the flexible circuit board, the pressure sensing element is located in the accommodation groove, one end of the shell away from the electrical connector is provided with a columnar temperature sensing section, the temperature sensing element extends into the columnar temperature sensing section, the columnar temperature sensing section is filled with heat-conducting glue, a first medium hole for allowing external medium to flow to the pressure sensing element is formed in the shell, a second medium hole for allowing external medium to flow to the pressure sensing element is formed in the support, the first medium hole and the second medium hole are communicated, the temperature sensing element and the pressure sensing element are electrically connected with the flexible circuit board, and the flexible circuit board is electrically connected with the electrical connector.

2. The intrinsically safe temperature pressure sensor of claim 1, wherein: The support is provided with a rectangular protrusion at one end away from the flexible circuit board, a rectangular groove matched with the rectangular protrusion is arranged on the inner wall of the shell, and the columnar temperature sensing section is opposite to the rectangular groove.

3. The intrinsically safe temperature pressure sensor of claim 2, wherein: The support is provided with a pin, the temperature sensing element is electrically connected with the flexible circuit board through the pin, and the pin extends from the rectangular protrusion.

4. The intrinsically safe temperature pressure sensor of claim 2, wherein: The first medium hole and the second medium hole are both two, the first medium hole and the second medium hole are one-to-one corresponding, and the two second medium holes are located on the two sides of the rectangular protrusion respectively.

5. The intrinsically safe temperature pressure sensor of claim 4, wherein: Two sealing grooves are arranged on the inner wall of the shell, the first medium hole and the sealing groove are one-to-one corresponding, the two sealing grooves are located on the two sides of the rectangular groove respectively, the first medium hole is communicated with the second medium hole through the sealing groove, and a first sealing ring is arranged in each sealing groove.

6. The intrinsically safe temperature pressure sensor of claim 4, wherein: A second sealing ring is arranged in the accommodation groove, the second sealing ring surrounds the two second medium holes, and the second sealing ring is located on the side of the pressure sensing element away from the flexible circuit board.

7. The intrinsically safe temperature pressure sensor of claim 1, wherein: The columnar temperature sensing section has a stepped shaft structure, including a small-diameter section and a large-diameter section for mounting, the small-diameter section and the large-diameter section are sequentially arranged from the shell to the electrical connector, the temperature sensing element extends into the small-diameter section, a first groove is arranged on the outer wall of the large-diameter section, the first groove surrounds the large-diameter section, and a third sealing ring is arranged in the first groove.

8. The intrinsically safe temperature pressure sensor of claim 7, wherein: A second groove is further arranged on the outer wall of the large-diameter section, the second groove surrounds the large-diameter section, the first groove and the second groove are sequentially and spacedly arranged from the shell to the electrical connector, and a snap spring for mounting and fixing is arranged in the second groove.

9. The intrinsically safe temperature pressure sensor of claim 1, wherein: The shell comprises a plastic part and a metal thin ring, the metal thin ring is integrally injection molded with the plastic part, the metal thin ring is arranged at one end of the shell facing the electrical connector, the end of the metal thin ring located outside the plastic part has a bending part pressing the electrical connector, and the end of the metal thin ring located inside the plastic part is provided with a Z-shaped bending part.

10. The intrinsically safe temperature pressure sensor of claim 1, wherein: The electrical connector is provided with a limiting structure for limiting and fixing a supporting piece, the limiting structure is located in the accommodating cavity, the supporting piece is provided with a limiting groove matched with the limiting structure, the limiting groove is provided with a buckle, and the limiting structure is provided with a buckle groove matched with the buckle.

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