Film pressure sensor

Abstract

The utility model relates to the technical field of pressure measurement, in particular to a film pressure sensor, which comprises an upper sleeve, a lower sleeve, a film and a connecting sleeve, the upper sleeve is arranged at one end inside the connecting sleeve, the lower sleeve is arranged at one end inside the connecting sleeve opposite to the upper sleeve, and the film is fixedly mounted between the upper sleeve and the lower sleeve. The peripheries of the two sides of the thin film are attached to the end faces, close to each other, of the upper sleeve and the lower sleeve respectively, threads are arranged at the two ends of the inner wall of the connecting sleeve, and only the end faces, away from each other, of the upper sleeve and the lower sleeve of the device need to be attached to the two faces needing to be measured; through a simple structure, the upper sleeve and the lower sleeve can transmit pressure to the thin film when bearing pressure, the shape of the thin film is changed so as to achieve the purpose of measuring the pressure, and due to the special structure of the thin film, the strain is very rapid and sensitive when the thin film bears the pressure, and the strain capacity is much larger than that of a planar thin film.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure measurement, in particular to a thin film pressure sensor. Background Art

[0002] The membrane pressure sensor is a pressure sensor with excellent performance. It is a new type of sensor born with the development of thin film technology. With the development of industrial technology, pressure sensors are a very common sensor, which is used in various occasions and different fields. Thin film sensing sheets are widely used in the detection of industrial equipment due to their advantages of lightness, flexibility and ductility. Commonly used pressure sensors are generally made of metal structures, with relatively large volume and hard texture, and have certain limitations; thin film pressure sensors are flexible and small sensors with advantages that ordinary pressure sensors do not have. They can be used in wearable devices or smaller structures. Existing pressure sensors usually measure the test object by a single pressure sensing area, and data collection is slow and cumbersome. When multiple sets of data need to be compared, it will be very inconvenient. The data needs to be recorded in advance and then compared one by one, which greatly affects the measurement efficiency and is extremely inconvenient to use. Utility Model Content

[0003] The purpose of the utility model is to provide a thin film pressure sensor to solve the problems existing in the above-mentioned prior art.

[0004] The above technical objectives of the utility model are achieved through the following technical solutions:

[0005] A film pressure sensor comprises an upper sleeve, a lower sleeve, a film and a connecting sleeve, wherein the upper sleeve is arranged at one end inside the connecting sleeve, and the lower sleeve is arranged at one end inside the connecting sleeve opposite to the upper sleeve, the film is fixedly installed between the upper sleeve and the lower sleeve, and the peripheral edges on both sides of the film are respectively in contact with the end surfaces of the upper sleeve and the lower sleeve that are close to each other, and threads are arranged at both ends of the inner wall of the connecting sleeve.

[0006] By adopting the above technical solution, it is only necessary to make the end faces of the upper sleeve and the lower sleeve of the device that are far away from each other fit together with the two surfaces that need to be measured. Through a simple structure, the upper sleeve and the lower sleeve can transmit pressure to the film when under pressure, change the shape of the film and thus achieve the purpose of measuring pressure. The special structure of the film causes it to strain very quickly and sensitively when under pressure, and the strain amount is much larger than that of a planar film.

[0007] In a further embodiment, arc transition angles are provided at the positions where the outer annular portion, the connecting ring portion, the first wave portion, the first ring portion, the second wave portion, the second ring portion, the third wave portion and the central disk portion are connected to each other, and the film thickness is consistent.

[0008] By adopting the above technical solution, the problem of uneven strain caused by inconsistent thickness in some areas can be avoided.

[0009] In a further embodiment, an extension cylinder is inserted into one end of the upper sleeve away from the lower sleeve.

[0010] In a further embodiment, a stepped cylindrical surface is provided inside the upper sleeve, and a chamfered transition is provided on the surface where the stepped cylinder fits with the inner wall of the upper sleeve.

[0011] In a further embodiment, conductor wires are embedded inside the outer annular portion, the connecting annular portion, the first wavy portion, the first annular portion, the second wavy portion, the second annular portion, the third wavy portion and the center disk of the film.

[0012] In a further embodiment, sealing structures are provided at both ends of the upper sleeve and the lower sleeve.

[0013] In summary, the utility model has the following beneficial effects:

[0014] 1. It is sufficient to make the end faces of the upper sleeve and the lower sleeve of the device that are far away from each other fit with the two surfaces that need to be measured. Through a simple structure, the upper sleeve and the lower sleeve can transmit pressure to the film when under pressure, change the shape of the film, and thus achieve the purpose of measuring pressure. The special structure of the film causes it to strain very quickly and sensitively when under pressure, and the strain amount is much greater than that of a flat film. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the film of the utility model.

[0017] In the figure, 1, upper sleeve; 2, lower sleeve; 3, film; 31, outer annular portion; 32, connecting ring portion; 33, first wave portion; 34, first ring portion; 35, second wave portion; 36, second ring portion; 37, third wave portion; 38, center disk portion; 4, connecting sleeve. DETAILED DESCRIPTION

[0018] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0019] Among them, the same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the Figure 1 drawing, and the terms "bottom surface" and "top surface", "inner" and "outer" respectively refer to the directions facing or away from the geometric center of a specific component. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this specification, "a plurality" means two or more unless otherwise specifically defined.

[0020] Embodiment 1:

[0021] As Figure 1 - Figure 2 shown, a thin-film pressure sensor includes an upper sleeve 1, a lower sleeve 2, a thin film 3, and a connecting sleeve 4. The upper sleeve 1 is disposed at one end inside the connecting sleeve 4, and the lower sleeve 2 is disposed at the end inside the connecting sleeve 4 opposite to the upper sleeve 1. The thin film 3 is fixedly installed between the upper sleeve 1 and the lower sleeve 2, and the peripheral edges on both sides of the thin film 3 are respectively attached to the end faces of the upper sleeve 1 and the lower sleeve 2 that are close to each other. Threads are provided at both ends of the inner wall of the connecting sleeve 4. The thin film 3 is integrally formed by sequentially arranging an outer ring portion 31, a connecting ring portion 32, a first wave portion 33, a first ring portion 34, a second wave portion 35, a second ring portion 36, a third wave portion 37, and a central disc portion 38 from the outside to the inside. Arc transition angles are provided at the positions where the outer ring portion 31, the connecting ring portion 32, the first wave portion 33, the first ring portion 34, the second wave portion 35, the second ring portion 36, the third wave portion 37, and the central disc portion 38 are connected to each other, and the thickness of the thin film 3 is uniform. An extension cylinder is inserted into the end of the upper sleeve 1 away from the lower sleeve 2. A stepped cylindrical surface is provided inside the upper sleeve 1, and a chamfer transition is provided on the surface of the stepped cylinder that fits the inner wall of the upper sleeve 1. Conductor wires are buried inside the outer ring portion 31, the connecting ring portion 32, the first wave portion 33, the first ring portion 34, the second wave portion 35, the second ring portion 36, the third wave portion 37, and the central disc of the thin film 3. Sealing structures are provided at both ends of the upper sleeve 1 and the lower sleeve 2.

[0022] Specific implementation process: It only needs to make the end faces of the upper sleeve and the lower sleeve of the device that are away from each other fit with the two surfaces to be measured. Through a simple structure, when the upper sleeve and the lower sleeve are under pressure, the pressure can be transmitted to the thin film, changing the shape of the thin film so as to achieve the purpose of measuring pressure. Moreover, the special structure of the thin film results in a very rapid and sensitive strain when it is under pressure and a much larger strain compared to a planar thin film.

[0023] During the use, the end faces where the upper sleeve and the lower sleeve move away from each other will simultaneously exert pressure on the outer ring portion 31 of the film 3. After the outer ring portion 31 of the film 3 is subjected to pressure, internal stress changes will occur. Since the film 3 of this device has multiple wavy connecting ring portions, it has a larger extension space compared to the traditional disc-shaped film 3, which means that the film 3 is more sensitive to changes in internal stress. Therefore, the film 3 of this solution is more sensitive than the prior art.

[0024] In the embodiments disclosed in the present utility model, terms such as "installation", "connection", "attachment", "fixation" and the like shall be understood in a broad sense. For example, "connection" may be a fixed connection, a detachable connection, or an integral connection; "attachment" may be a direct attachment or an indirect attachment through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments disclosed in the present utility model can be understood according to specific circumstances.

[0025] This specific embodiment is only an interpretation of the present utility model and does not limit the present utility model. Those skilled in the art can make modifications to this embodiment without creative contributions according to needs after reading this specification, but as long as they are within the scope of the claims of the present utility model, they are protected by the patent law.

Claims

1. A thin film (3) pressure sensor, comprising an upper sleeve (1), a lower sleeve (2), a thin film (3) and a connecting sleeve (4), characterized in that: The upper sleeve (1) is arranged at one end inside the connecting sleeve (4), the lower sleeve (2) is arranged at the end inside the connecting sleeve (4) opposite to the upper sleeve (1), the film (3) is fixedly installed between the upper sleeve (1) and the lower sleeve (2), and the peripheral edges on both sides of the film (3) are respectively attached to the end faces of the upper sleeve (1) and the lower sleeve (2) that are close to each other. Threads are provided at both ends of the inner wall of the connecting sleeve (4). The film (3) is integrally formed by sequentially arranging an outer ring portion (31), a connecting ring portion (32), a first wave portion (33), a first ring portion (34), a second wave portion (35), a second ring portion (36), a third wave portion (37), and a central disc portion (38) from outside to inside.

2. The thin film (3) pressure sensor according to claim 1, characterized in that: Arc transition angles are provided at the positions where the outer ring portion (31), the connecting ring portion (32), the first wave portion (33), the first ring portion (34), the second wave portion (35), the second ring portion (36), the third wave portion (37), and the central disc portion (38) are connected to each other, and the thickness of the film (3) is uniform.

3. The thin film (3) pressure sensor according to claim 1, characterized in that: An extension cylinder is inserted at the end of the upper sleeve (1) away from the lower sleeve (2).

4. The thin film (3) pressure sensor according to claim 1, characterized in that: A stepped cylindrical surface is provided inside the upper sleeve (1), and a chamfer transition is provided on the surface of the stepped cylinder that fits the inner wall of the upper sleeve (1).

5. A thin film (3) pressure sensor according to claim 1, characterized in that: Conductor wires are embedded inside the outer ring portion (31), the connecting ring portion (32), the first wave portion (33), the first ring portion (34), the second wave portion (35), the second ring portion (36), the third wave portion (37), and the central disc of the film (3).

6. The thin film (3) pressure sensor according to claim 1, wherein: Sealing structures are provided at both ends of the upper sleeve (1) and the lower sleeve (2).

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