Corrugated diaphragm

Abstract

The utility model relates to the technical field of pressure sensors, and discloses a corrugated diaphragm, which comprises an outer edge, a transition part and a central part which are integrally formed and sequentially annularly connected from outside to inside, the two sides of the transition part are respectively connected with a pressing ring and a base of an oil-filled pressure core body in an attached manner, and the installation of the corrugated diaphragm and the oil-filled pressure core body is completed; the central pressure sensing area and the central part are coaxially arranged, and the edge pressure sensing areas are distributed around the central pressure sensing area at intervals in the circumferential direction of the central part in a surrounding mode. The edge pressure sensing area is provided with a first arc-shaped corrugation which is concentric with the edge pressure sensing area, so that the axial stress can be buffered, the mechanical strength of the corrugated diaphragm is increased, and the sensitivity of the corrugated diaphragm is improved; second arc-shaped ripples are arranged between two adjacent edge pressure sensing areas and are concentric with the central pressure sensing area, so that radial stress can be buffered, extrusion deformation in the manufacturing process is avoided, and the machining yield and the product performance are improved; the stress and strength of the corrugated diaphragm are improved, and the application pressure range of the corrugated diaphragm is optimized.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure sensor technical field especially relates to a corrugated diaphragm. BACKGROUND

[0002] Oil-filled pressure core is a kind of core component acting on pressure sensor, it is a sealed cavity structure filled with oil inside, which contains a sensitive element, i.e. pressure chip, and the pressure felt by the outside is transmitted inward through diaphragm. The oil inside has the characteristics of low viscosity, high thermal stability, not easy to volatilize and chemical inertness, which plays a role in transmitting pressure between diaphragm and pressure chip.

[0003] When external pressure acts on oil-filled pressure core, pressure is first transmitted to the oil in the cavity. Since the oil is almost incompressible, it will immediately transmit the pressure uniformly to the sensitive element. The sensitive element deforms after feeling the pressure, and this deformation will produce a change in pressure signal. The pressure-transmitting element of the oil-filled pressure core can be selected as a diaphragm, which will deform when subjected to external pressure, and the degree of deformation is proportional to the applied pressure, which plays a role in transmitting pressure and isolating medium.

[0004] The current conventional design is to form one or more concentric circular ring structures with a certain spacing on the surface of the diaphragm, and in order to improve the sensitivity of the diaphragm, the thickness of the diaphragm needs to be reduced, but this design cannot balance the strength and reliability of the diaphragm, causing the diaphragm to be easily deformed, unstable structure and other problems. INVENTION CONTENTS

[0005] The utility model aims at providing a corrugated diaphragm, which improves the axial and radial pressure resistance, improves the strength and improves the durability and reliability; effectively reduces the mechanical stress, improves the processing yield and product performance.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The corrugated diaphragm for oil-filled pressure core comprises an outer edge, a transition part and a central part which are integrally formed and connected in turn from outside to inside, the two sides of the transition part are connected with the pressure ring and the base of the oil-filled pressure core respectively, the central part comprises a central pressure sensing area and a plurality of edge pressure sensing areas, the central pressure sensing area is coaxially arranged with the central part, and the edge pressure sensing areas are arranged at a preset distance along the circumference of the central part, the edge pressure sensing areas are provided with first arc-shaped corrugations, second arc-shaped corrugations are arranged between adjacent two edge pressure sensing areas, the first arc-shaped corrugations are concentrically arranged with the edge pressure sensing areas, and the second arc-shaped corrugations are concentrically arranged with the central pressure sensing area.

[0008] As an optional technical solution for corrugated diaphragms, the number of edge pressure-sensitive zones is greater than 3.

[0009] As an optional technical solution for corrugated diaphragms, the first arc-shaped corrugation and the second arc-shaped corrugation have opposite bending directions.

[0010] As an optional technical solution for the corrugated diaphragm, one or more of the first arc-shaped corrugations are provided, and the plurality of the first arc-shaped corrugations are distributed in an envelope shape, and the spacing between two adjacent first arc-shaped corrugations is equal.

[0011] As an optional technical solution for the corrugated diaphragm, one or more of the second arc-shaped corrugations are provided, and the multiple second arc-shaped corrugations are distributed in an envelope shape, and the spacing between two adjacent second arc-shaped corrugations is equal.

[0012] As an optional technical solution for the corrugated diaphragm, the central pressure-sensitive area and the edge pressure-sensitive area are on the same horizontal plane and protrude from the plane of the transition portion.

[0013] As an optional technical solution for the corrugated diaphragm, the central pressure-sensitive area and the edge pressure-sensitive area are on the same horizontal plane as the transition portion.

[0014] As an optional technical solution for the corrugated diaphragm, the second arc-shaped corrugation includes circumferential corrugations, which surround the outer periphery of the central pressure-sensitive area.

[0015] As an optional technical solution for the corrugated diaphragm, the diameter of the outer edge is greater than or equal to 6 mm.

[0016] As an optional technical solution for the corrugated diaphragm, the outer edge is integrally welded to the pressure ring and base of the oil-filled pressure core.

[0017] The beneficial effects of this utility model are:

[0018] The corrugated diaphragm provided by this utility model is used for an oil-filled pressure core, comprising an integrally formed outer edge, a transition portion, and a central portion that are sequentially connected from the outside to the inside. The inner and outer rings of the transition portion are respectively connected to the central portion and the outer edge. The two sides of the transition portion are respectively fitted and connected to the pressure ring and base of the oil-filled pressure core to complete the installation of the corrugated diaphragm and the oil-filled pressure core. The central portion includes a central pressure-sensing area and multiple edge pressure-sensing areas. The central pressure-sensing area is coaxially arranged with the central portion, and the edge pressure-sensing areas are arranged at preset distances along the circumference of the central portion, surrounding the central pressure-sensing area to disperse the sensed pressure. The edge pressure-sensing areas are provided with a first arc-shaped corrugation, which is concentric with the edge pressure-sensing areas. This first arc-shaped corrugation can buffer the axial stress on the corrugated diaphragm, while increasing the mechanical strength of the corrugated diaphragm and improving its sensitivity. A second arc-shaped corrugation is provided between two adjacent edge pressure-sensing zones. This second arc-shaped corrugation is concentric with the central pressure-sensing zone, which buffers the radial stress on the corrugated diaphragm, preventing stress-induced deformation during manufacturing and improving processing yield and product performance. This corrugated diaphragm improves axial and radial pressure resistance, allowing for a reduction in thickness and mechanical stress while maintaining strength. This optimizes the diaphragm's application pressure range, sensitivity, repeatability, nonlinearity, and hysteresis, resulting in higher durability and reliability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of one embodiment of the corrugated diaphragm provided in a specific embodiment of this utility model;

[0020] Figure 2 This is an isometric view of one embodiment of the corrugated diaphragm provided in a specific embodiment of this utility model;

[0021] Figure 3 This is a schematic diagram of another embodiment of the corrugated diaphragm provided in a specific embodiment of this utility model;

[0022] Figure 4 This is an isometric view of another embodiment of the corrugated diaphragm provided in a specific embodiment of this utility model.

[0023] In the picture:

[0024] 1. Outer edge; 2. Transition section; 3. Central section; 41. Central pressure-sensitive area; 42. Edge pressure-sensitive area; 51. First arc-shaped ripple; 52. Second arc-shaped ripple. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0026] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0029] like Figures 1 to 4 As shown, this utility model discloses a corrugated diaphragm for an oil-filled pressure core, comprising an integrally formed outer edge 1, a transition portion 2, and a central portion 3 sequentially connected from the outside to the inside. The inner and outer rings of the transition portion 2 are respectively connected to the central portion 3 and the outer edge 1. The two sides of the transition portion 2 are respectively fitted and connected to the pressure ring and base of the oil-filled pressure core, mainly for completing the installation of the corrugated diaphragm and the oil-filled pressure core. Exemplarily, the corrugated diaphragm can be made of a combination of various metal materials, all of which must have excellent corrosion resistance, such as stainless steel, titanium, tantalum, etc.

[0030] In this embodiment, the pressure ring and base of the oil-filled pressure core are welded together with the corrugated diaphragm at the outer edge 1. The outer edge 1 is circular in shape, and its diameter can be designed to correspond to the specifications of the oil-filled pressure core, such as φ8mm, φ10mm, φ12mm, etc., depending on the application scenario. The smallest diameter of the outer edge 1 can be φ6mm. Unlike conventional diaphragms, which are limited by factors such as thickness and stress and cannot have a very small diameter, this corrugated diaphragm can further reduce its size, enabling more miniaturized applications.

[0031] Specifically, the central portion 3 is used to sense external pressure. The central portion 3 includes a central pressure-sensing area and multiple edge pressure-sensing areas. The central pressure-sensing area is coaxially arranged with the central portion 3, and the edge pressure-sensing areas are arranged at preset distances along the circumference of the central portion 3, evenly distributed around the central pressure-sensing area, which can disperse the sensed pressure. For example, the number of edge pressure-sensing areas should be greater than 3, and the edge pressure-sensing areas can be set in a symmetrical form radiating from the center to further improve the stability of the corrugated diaphragm.

[0032] In this embodiment, the edge pressure-sensitive area is provided with a first arc-shaped corrugation 51. The first arc-shaped corrugation 51 is concentrically arranged with the edge pressure-sensitive area, which can buffer the axial stress on the corrugated diaphragm, while increasing the mechanical strength of the corrugated diaphragm and improving its sensitivity. Exemplarily, the number of first arc-shaped corrugations 51 can be designed to be at least one or more depending on the overall size of the corrugated diaphragm, and the multiple first arc-shaped corrugations 51 are distributed in an enveloping spring structure, with the spacing between two adjacent first arc-shaped corrugations 51 being equal.

[0033] Understandably, a second arc-shaped corrugation 52 is provided between two adjacent edge pressure-sensitive areas. This second arc-shaped corrugation 52 is concentrically positioned with the central pressure-sensitive area, which buffers the radial stress on the corrugated diaphragm, preventing stress from causing extrusion deformation during manufacturing and improving processing yield and product performance. Similarly, the number of second arc-shaped corrugations 52 can be designed to be at least one or more, depending on the overall size of the corrugated diaphragm. These multiple second arc-shaped corrugations 52 are distributed in an enveloping spring structure, and the spacing between adjacent second arc-shaped corrugations 52 is equal.

[0034] The first arc-shaped corrugation 51 and the second arc-shaped corrugation 52 are evenly distributed in the circumferential direction of the corrugated diaphragm, which can play a buffering role. When the corrugated diaphragm is subjected to violent vibration caused by high-pressure impact or drop, the first arc-shaped corrugation 51 and the second arc-shaped corrugation 52 can be driven by the diaphragm to release the stress towards the edge of the corrugated diaphragm, reducing the possibility of the corrugated diaphragm breaking and permanent deformation.

[0035] Furthermore, the first arc-shaped corrugation 51 and the second arc-shaped corrugation 52 have opposite bending directions. While maintaining the deformation amplitude of the central pressure-sensitive area in response to external pressure, the structural stability of the edge pressure-sensitive area can be maintained, thereby improving the reliability of the product.

[0036] This corrugated diaphragm improves axial and radial pressure resistance, and can appropriately reduce thickness and mechanical stress while ensuring strength. This optimizes the application pressure range, sensitivity, repeatability, nonlinearity, hysteresis and other properties of the corrugated diaphragm. With the improvement of stress and strength of the corrugated diaphragm, it has higher durability and reliability.

[0037] In one embodiment of this example, specifically as follows: Figure 1 and Figure 2 As shown, the central pressure-sensitive area and the edge pressure-sensitive area are on the same horizontal plane, but they are both convex relative to each other on the plane of the transition part 2.

[0038] In another embodiment of this example, specifically as follows: Figure 3 and Figure 4 As shown, the central pressure-sensitive area, the edge pressure-sensitive area, and the transition portion 2 are on the same horizontal plane. Meanwhile, the second arc-shaped corrugation 52 includes a circumferential corrugation that surrounds the outer periphery of the central pressure-sensitive area, adding one more circumferential corrugation to the central pressure-sensitive area compared to the previous embodiment. However, the two specific embodiments are functionally identical, differing only in their corrugation pattern design.

[0039] This utility model also provides a method for manufacturing the above-mentioned corrugated diaphragm. First, the required size of the corrugated diaphragm is determined according to the specifications of the oil-filled pressure core. Then, the material of the corrugated diaphragm is determined, and the punch and die of the stamping die are processed according to the stretching amount of the material and the preset corrugated pattern. The raw material sheet is placed into the stamping die and stamped to obtain the first arc-shaped corrugation 51 and the second arc-shaped corrugation 52 in the central part 3. Finally, the outer edge 1 is cut along the preset outer diameter of the corrugated diaphragm to form a complete corrugated diaphragm, which effectively improves the processing yield and product performance, and optimizes the size specifications of the corrugated diaphragm.

[0040] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A corrugated diaphragm for use in an oil-filled pressure core, characterized in that, The corrugated diaphragm includes an integrally formed outer edge (1), a transition portion (2), and a central portion (3) that are sequentially connected from the outside to the inside. The two sides of the transition portion (2) are respectively connected to the pressure ring and the base of the oil-filled pressure core. The central portion (3) includes a central pressure-sensing area (41) and multiple edge pressure-sensing areas (42). The central pressure-sensing area (41) is coaxially arranged with the central portion (3), and the edge pressure-sensing areas (42) are arranged at a predetermined distance along the circumference of the central portion (3). The edge pressure-sensing areas (42) are provided with a first arc-shaped corrugation (51), and a second arc-shaped corrugation (52) is provided between two adjacent edge pressure-sensing areas (42). The first arc-shaped corrugation (51) is concentrically arranged with the edge pressure-sensing area (42), and the second arc-shaped corrugation (52) is concentrically arranged with the central pressure-sensing area (41).

2. The corrugated diaphragm according to claim 1, characterized in that, The number of edge pressure-sensitive areas (42) is greater than 3.

3. The corrugated diaphragm according to claim 1, characterized in that, The first arc-shaped corrugation (51) has the opposite bending direction to the second arc-shaped corrugation (52).

4. The corrugated diaphragm according to claim 1, characterized in that, One or more of the first arc-shaped corrugations (51) are provided, and the multiple first arc-shaped corrugations (51) are distributed in an envelope shape, and the spacing between two adjacent first arc-shaped corrugations (51) is equal.

5. The corrugated diaphragm according to claim 1, characterized in that, One or more of the second arc-shaped corrugations (52) are provided, and the multiple second arc-shaped corrugations (52) are distributed in an envelope shape, and the spacing between two adjacent second arc-shaped corrugations (52) is equal.

6. The corrugated diaphragm according to claim 1, characterized in that, The central pressure-sensitive area (41) and the edge pressure-sensitive area (42) are on the same horizontal plane and protrude from the plane of the transition portion (2).

7. The corrugated diaphragm according to claim 1, characterized in that, The central pressure-sensitive area (41) and the edge pressure-sensitive area (42) are on the same horizontal plane as the transition portion (2).

8. The corrugated diaphragm according to claim 7, characterized in that, The second arc-shaped ripple (52) includes a circumferential ripple that surrounds the outer periphery of the central pressure-sensitive area (41).

9. The corrugated diaphragm according to claim 1, characterized in that, The diameter of the outer edge (1) is greater than or equal to 6 mm.

10. The corrugated diaphragm according to any one of claims 1-9, characterized in that, The outer edge (1) is integrally welded to the pressure ring and base of the oil-filled pressure core.

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