A general-purpose pressure sensor

Abstract

The application discloses a universal pressure sensor, which comprises a pressure seat provided with a measuring hole at the bottom end, and a shell fixedly connected with the top edge of the pressure seat at the bottom end, wherein the top end of the pressure seat is provided with a limiting groove, the opening of the shell is downwardly arranged, the top end of the pressure seat and the inner wall of the shell enclose a cavity, the top end of the pressure seat is fixedly provided with a binding plate and a strain gauge, the binding plate is provided with mounting holes and limiting holes, the strain gauge is arranged in the mounting hole, a metal wire is arranged between the strain gauge and the binding plate, a compensation plate is arranged above the binding plate and fixedly connected with the binding plate through a support, the lower end of the support is provided with a limiting block and a containing cavity, the limiting block is inserted into the limiting groove through the limiting hole, the opening of the containing cavity is downwardly arranged to contain the strain gauge and the metal wire, and a plurality of vertical wires are fixedly connected with the compensation plate. The application improves the overload capacity and the sealing performance of the pressure sensor and expands the range of the pressure sensor.

Description

Technical Field

[0001] This application relates to the field of sensor technology, and in particular to a general-purpose pressure sensor. Background Technology

[0002] General-purpose pressure sensors measure pressure by creating resistance through the diffusion of impurities onto silicon material and utilizing the change in resistance of the silicon material under pressure. Existing general-purpose pressure sensors typically have narrow measurement ranges, requiring the use of different structures for varying range requirements. Furthermore, existing general-purpose pressure sensors have weak overload capacity, and strain gauges are easily damaged during installation, leading to decreased measurement accuracy and potentially causing production stoppages, product scrapping, or even serious safety accidents. Utility Model Content

[0003] In view of the deficiencies in the prior art, this application provides a general-purpose pressure sensor to solve the technical problems of narrow range, weak overload capacity and easy damage of strain gauges in the prior art.

[0004] To achieve the objectives of the above application, the technical solution provided in this application is as follows:

[0005] A general-purpose pressure sensor includes a pressure base and a housing. The pressure base has a measurement hole at its bottom end, which is a blind hole for contact with external fluid. The measurement hole is vertically oriented. A limiting groove is provided at the top end of the pressure base. The housing has an opening facing downwards, and its bottom end is fixedly connected to the top edge of the pressure base. The housing and pressure base form a cylindrical shape. The top end of the pressure base and the inner wall of the housing form a cavity. A binding plate and a strain gauge are fixedly mounted at the top end of the pressure base. The binding plate has a mounting hole and a limiting hole, both of which are through holes. The mounting hole is located directly above the measurement hole. A limiting hole is located directly above the limiting groove. The strain gauge is installed in the mounting hole. A metal wire is installed between the strain gauge and the binding plate to connect the strain gauge and the binding plate. A compensation plate is installed above the binding plate and is fixedly connected to the binding plate by a bracket. A limiting block is installed at the lower end of the bracket. The limiting block passes through the limiting hole and is inserted into the limiting groove. There is a certain distance between the bottom end of the limiting block and the bottom end of the limiting groove. Multiple vertically arranged wires are fixedly connected to the compensation plate and pass through the housing. Sealant is installed between the wires, the housing, and the compensation plate to seal them.

[0006] In one embodiment, the bottom end of the pressure seat is further provided with an annular groove, which is concentric with the measuring hole, and the pressure seat is integrally formed.

[0007] In one embodiment, the central axes of the measuring hole and the mounting hole coincide with the central axis of the pressure seat, and the limiting grooves are symmetrically arranged on both sides of the measuring hole about the center of the pressure seat.

[0008] In one embodiment, the distance between the top of the measuring hole and the top of the pressure seat is 0.3-1.2 mm, the pressure seat and the outer shell are coaxially arranged, and the outer diameter of both the pressure seat and the outer shell is 19 mm.

[0009] In one embodiment, the metal wire is an aluminum wire, and the bottom end of the housing is welded to the top edge of the pressure seat.

[0010] In one embodiment, the compensation plate and the bonding plate are connected by a flexible plate, which is used to connect the circuits in the compensation plate and the bonding plate.

[0011] In one embodiment, a gasket is provided between the compensation plate and the top of the housing.

[0012] In one embodiment, the top of the outer shell is further provided with a vent hole, which is a through hole with its bottom end facing the compensation plate. The central axis of the vent hole coincides with the central axis of the pressure seat, and the wires are symmetrically arranged on both sides of the vent hole about the center of the pressure seat.

[0013] In one embodiment, the outer wall of the pressure seat is provided with an annular groove, a sealing ring is provided in the annular groove, and a retaining ring is provided between the upper side of the sealing ring and the annular groove.

[0014] In one embodiment, the top surface of the pressure seat is provided with glass glue, and the strain gauge is fixed to the pressure seat by the glass glue.

[0015] Compared with the prior art, this application has at least the following beneficial effects:

[0016] The universal pressure sensor in this application reduces the impact of external forces on the strain gauge and binding wire during installation by utilizing the interaction between the limiting groove at the top of the pressure seat and the limiting block of the bracket, thus preventing damage to the strain gauge or binding wire. The integrally molded pressure seat improves the sealing and overload capacity of the universal pressure sensor, reducing the risk of leakage and media compatibility issues caused by welds or silicone oil. The annular groove at the bottom of the pressure seat releases mechanical stress, improving the output stability of the universal pressure sensor. The measuring hole top and pressure... The distance between the top of the pressure seat is 0.3-1.2mm, which expands the range of the general-purpose pressure sensor and meets the needs of different ranges. The strain gauge is fixed on the pressure seat by connecting it through glass micro-fusion process, which improves the stability, reliability and high and low temperature resistance, vibration resistance and other performance of the general-purpose pressure sensor structure. In this application, the outer shell and the pressure seat form a cylindrical pressure seat and the outer shell are coaxially arranged. The outer diameter of the pressure seat and the outer shell are both 19mm, so that the pressure sensor in this application is consistent with the general diffused silicon pressure sensor in appearance, which is conducive to improving the product applicability and consistency of the pressure sensor in this application. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the general-purpose pressure sensor in the embodiments of this application;

[0018] Figure 2 yes Figure 1 Enlarged view of frame A in the middle;

[0019] Figure 3 This is a top view of the binding plate in an embodiment of this application;

[0020] Reference numerals: 1. Pressure seat; 2. Bracket; 3. Compensating plate; 4. Washer; 5. Wire; 6. Sealant; 7. Housing; 8. Binding plate; 801. Mounting hole; 802. Limiting hole; 9. Retaining ring; 10. Sealing ring; 11. Measuring hole; 12. Annular groove; 13. Vent hole; 14. Limiting groove; 15. Metal wire; 16. Strain gauge; 17. Glass glue; 18. Flexible plate. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the application is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of this application. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of this application.

[0022] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0023] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0024] In the description of this application, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical connection or internal connection between two components. They can be direct connection or indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0025] To better understand the technical solution of this application, the application will be described in detail below with reference to the accompanying drawings.

[0026] This embodiment provides a general-purpose pressure sensor, as shown in the attached figure. Figure 1-3As shown, the device includes a pressure seat 1 and a housing 7. The pressure seat 1 has a measuring hole 11 at its bottom end. The measuring hole 11 is a blind hole for contact with external fluid and is vertically oriented. The pressure seat 1 has a limiting groove 14 at its top end. The housing 7 has its opening facing downwards. The bottom end of the housing 7 is fixedly connected to the top edge of the pressure seat 1 by welding. The housing and pressure seat form a cylindrical shape and are coaxially aligned. The outer diameter of both the pressure seat and housing is 19mm. The top end of the pressure seat 1 and the inner wall of the housing 7 form a cavity. A binding plate 8 and a strain gauge 16 are fixedly mounted on the top end of the pressure seat 1. The binding plate 8 has a mounting hole 801 and a limiting hole 802, both of which are through holes. The mounting hole 801 is located directly above the measuring hole 11, and the limiting hole 802... 2. The strain gauge 16 is installed in the mounting hole 801 and is positioned directly above the limiting groove 14. A metal wire 15 is provided between the strain gauge 16 and the binding plate 8 to connect the strain gauge 16 and the binding plate 8. A compensation plate 3 is provided above the binding plate 8 and is fixedly connected to the binding plate 8 by the bracket 2. The lower end of the bracket 2 is provided with a limiting block and a receiving cavity. The limiting block passes through the limiting hole 802 and is inserted into the limiting groove 14. The bottom end of the limiting block is a certain distance from the bottom end of the limiting groove 14. The opening of the receiving cavity is set downward to accommodate the strain gauge 16 and the metal wire 15. Multiple vertically arranged wires 5 are fixedly connected to the compensation plate 3 and pass through the outer shell 7. A sealant 6 is provided between the wires 5, the outer shell 7 and the compensation plate 3 and is sealed by the sealant 6.

[0027] An annular groove 12 is provided at the bottom of the pressure seat 1, and the annular groove 12 is concentrically arranged with the measuring hole 11. The pressure seat 1 is integrally formed. The annular groove 12 can release the stress of the pressure seat 1, thereby improving the output stability of the general-purpose pressure sensor. The central axes of the measuring hole 11 and the mounting hole 801 are both coincident with the central axis of the pressure seat 1. Two limiting grooves 14 are symmetrically arranged on both sides of the measuring hole 11 about the center of the pressure seat 1. The distance between the top of the measuring hole 11 and the top of the pressure seat 1 is 0.3-1.2mm to expand the measuring range of the general-purpose pressure sensor and meet the needs of different measuring ranges. The metal wire 15 is made of aluminum wire to reduce the manufacturing cost and weight of the sensor. The bottom of the housing 7 is welded to the top edge of the pressure seat 1. The pressure seat 1 is integrally formed without weld seams, which improves the sealing performance and overload capacity of the general-purpose pressure sensor.

[0028] The compensation plate 3 and the binding plate 8 are connected by a flexible plate 18, which connects the circuits in the compensation plate 3 and the binding plate 8. A gasket 4 is provided between the compensation plate 3 and the top of the housing 7 to protect the compensation plate. A vent 13 is also provided at the top of the housing 7. The vent 13 is a through hole with its bottom end facing the compensation plate 3. The vent 13 helps to balance the atmospheric pressure of the pressure sensor. The central axis of the vent 13 coincides with the central axis of the pressure seat 1. The wires 5 are symmetrically arranged on both sides of the vent 13 about the center of the pressure seat 1.

[0029] The outer wall of the pressure seat 1 is provided with an annular groove, and a sealing ring 10 is provided in the annular groove. A retaining ring 8 is provided between the upper side of the sealing ring 10 and the annular groove 8. The sealing performance of the general-purpose pressure sensor is ensured by the sealing ring 10 and the retaining ring 9.

[0030] like Figure 2 As shown, the top surface of the pressure seat 1 is provided with glass glue 17, and the strain gauge 16 is fixed to the pressure seat 1 by the glass glue. The glass glue 17 is used to connect the strain gauge 16 and the pressure seat 1 through the glass micro-fusion process, which improves the stability, reliability and high and low temperature resistance, vibration resistance and other performance of the general-purpose pressure sensor structure.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and not to limit them; although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation methods of the application or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of this application, and all of them should be covered within the scope of the technical solutions claimed in this application.

Claims

1. A general-purpose pressure sensor, characterized in that, The device includes a pressure seat and a housing. The pressure seat has a measuring hole at its bottom end; this hole is a blind hole for contact with external fluid and is vertically oriented. A limiting groove is provided at the top of the pressure seat. The housing opens downwards and its bottom end is fixedly connected to the top edge of the pressure seat. The housing and pressure seat form a cylindrical shape. The top of the pressure seat and the inner wall of the housing form a cavity. A binding plate and a strain gauge are fixedly mounted at the top of the pressure seat. The binding plate has a mounting hole and a limiting hole; both are through holes. The mounting hole is located directly above the measuring hole, and the limiting hole is located directly above the limiting groove. The strain gauge is... A metal wire is installed between the strain gauge and the bonding plate inside the mounting hole. The metal wire is used to connect the strain gauge and the bonding plate. A compensation plate is installed above the bonding plate. The compensation plate is fixedly connected to the bonding plate by a bracket. The lower end of the bracket is provided with a limit block and a receiving cavity. The limit block passes through the limit hole and is inserted into the limit groove. There is a certain distance between the bottom end of the limit block and the bottom end of the limit groove. The opening of the receiving cavity is set downward to accommodate the strain gauge and the metal wire. Multiple vertically arranged wires are fixedly connected to the compensation plate. The wires pass through the housing. Sealant is applied between the wires, the housing, and the compensation plate. The wires, the housing, and the compensation plate are sealed with sealant.

2. The universal pressure sensor according to claim 1, characterized in that, The bottom end of the pressure seat is also provided with an annular groove, which is concentric with the measuring hole, and the pressure seat is integrally formed.

3. The universal pressure sensor according to claim 1, characterized in that, The central axes of the measuring hole and the mounting hole coincide with the central axis of the pressure seat, and the limiting grooves are symmetrically arranged on both sides of the measuring hole about the center of the pressure seat.

4. The universal pressure sensor according to claim 1, characterized in that, The distance between the top of the measuring hole and the top of the pressure seat is 0.3-1.2mm. The pressure seat and the outer shell are coaxially arranged, and the outer diameter of both the pressure seat and the outer shell is 19mm.

5. The universal pressure sensor according to claim 1, characterized in that, The metal wire is aluminum wire, and the bottom end of the outer shell is welded to the top edge of the pressure seat.

6. The universal pressure sensor according to claim 1, characterized in that, The compensation plate and the binding plate are connected by a flexible plate, which is used to connect the circuits in the compensation plate and the binding plate.

7. The universal pressure sensor according to claim 1, characterized in that, A gasket is provided between the compensation plate and the top of the outer shell.

8. The universal pressure sensor according to claim 1, characterized in that, The top of the outer shell is also provided with a vent hole, which is a through hole. The bottom end of the vent hole faces the compensation plate. The central axis of the vent hole coincides with the central axis of the pressure seat. The wires are symmetrically arranged on both sides of the vent hole about the center of the pressure seat.

9. The universal pressure sensor according to claim 7, characterized in that, The outer wall of the pressure seat is provided with an annular groove, a sealing ring is provided in the annular groove, and a retaining ring is provided between the upper side of the sealing ring and the annular groove.

10. The universal pressure sensor according to claim 7, characterized in that, The top surface of the pressure seat is covered with glass glue, and the strain gauge is fixed to the pressure seat by the glass glue.

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