Small-size isolated acceleration sensor and assembling method thereof

Abstract

The invention relates to a small-size isolation type acceleration sensor and an assembling method thereof, the small-size isolation type acceleration sensor comprises an isolation base and a piezoelectric assembly, and the isolation base is used for insulating and isolating the piezoelectric assembly from a tested structure; the piezoelectric assembly comprises a support, a blind hole is formed in the bottom of the support, and the isolation base is embedded into the blind hole so as to be embedded, assembled and fixed with the piezoelectric assembly.

Description

Technical Field

[0001] The present application relates to an acceleration sensor, and more particularly, to a small-sized isolated acceleration sensor and an assembly method thereof. Background Art

[0002] The working principle of a piezoelectric acceleration sensor is to convert the physical quantity of acceleration into an electrical signal by using the direct piezoelectric effect of piezoelectric materials. At present, according to whether the sensor signal is isolated from the measured structure, it can be divided into an isolated acceleration sensor and a non-isolated acceleration sensor. Since the isolated acceleration sensor adds an isolation base structure, it is often large in size and cannot meet the installation requirements in a limited and narrow space. Summary of the Invention

[0003] The object of the present application is to provide a small-sized isolated acceleration sensor and an assembly method thereof, which can meet the installation requirements in a limited and narrow space while realizing the isolation between the acceleration sensor and the measured structure.

[0004] To achieve the above object, in a first aspect, the present invention provides a small-sized isolated acceleration sensor, including:

[0005] An isolation base and a piezoelectric component, wherein the isolation base is used to insulate and isolate the piezoelectric component from the measured structure;

[0006] The piezoelectric component includes a bracket, and a blind hole is provided at the bottom of the bracket. The isolation base is embedded in the blind hole to be fixedly assembled with the piezoelectric component in a nested manner.

[0007] The small-sized isolated acceleration sensor of the present application can realize the nested assembly and fixation of the isolation base and the piezoelectric component by embedding the isolation base into the blind hole at the bottom of the bracket of the piezoelectric component. In this way, while insulating and isolating the piezoelectric component from the measured structure by using the isolation base, the volume of the isolated acceleration sensor can be reduced by using the nested assembly and fixation of the isolation base and the piezoelectric component to meet the installation requirements in a limited and narrow space.

[0008] In an optional embodiment, an insulating gasket is further included, and the isolation base is in interference fit with the piezoelectric component through the insulating gasket.

[0009] In this optional embodiment, through the insulating gasket, on the one hand, the isolation base can be insulated and isolated from the blind hole of the piezoelectric component by the insulating gasket, and on the other hand, the isolation base can be in interference fit with the piezoelectric component, so as to improve the overall fixing stiffness of the isolated acceleration sensor through the interference fit and meet the requirements of high installation resonance and high-frequency frequency response of the isolated acceleration sensor.

[0010] In an alternative embodiment, the insulating gasket ring includes a circular ring or a slotted circular ring structure, and the isolation base is press-fitted with the insulating gasket ring through the circular ring or the slotted circular ring structure.

[0011] In this alternative, the isolation base and the insulating gasket ring can be press-fitted through the circular ring or the slotted circular ring structure.

[0012] In an alternative embodiment, the insulating gasket ring is a metal material with an insulated surface.

[0013] In this alternative embodiment, using a metal material with an insulated surface as the insulating gasket ring can achieve the insulating isolation function of the insulating gasket ring. At the same time, the advantage of the relatively high stiffness of the metal material can be utilized to improve the overall fixing stiffness of the sensor.

[0014] In an alternative embodiment, glue is filled in the gap between the bracket and the isolation base.

[0015] In this alternative embodiment, on the premise of using the insulating gasket ring to improve the overall fixing stiffness of the isolated accelerometer, the gap between the bracket and the isolation base is filled with glue, so as to further fasten the isolation base and the piezoelectric component, thereby further improving the overall fixing stiffness of the isolated accelerometer.

[0016] In an alternative embodiment, an insulating sheet is further included;

[0017] The insulating sheet is installed at the bottom of the blind hole. Among them, the bottom surface of the insulating sheet abuts against the top of the isolation base, and the top surface of the insulating sheet abuts against the blind hole, so as to insulate and isolate the top of the isolation base from the piezoelectric component.

[0018] In this alternative embodiment, through the insulating sheet, the top of the isolation base can be insulated and isolated from the piezoelectric component. On the other hand, the insulating sheet can axially limit the isolation base.

[0019] Second, the present invention provides an assembly method for an isolated accelerometer. The method is applied to the small-volume isolated accelerometer described in any of the foregoing embodiments. The method includes:

[0020] Invert the bracket of the piezoelectric component so that the blind hole of the bracket faces upward;

[0021] Insert the isolation base into the blind hole so that the piezoelectric component and the piezoelectric component are nested and assembled and fixed.

[0022] The method of the present application can invert the bracket of the piezoelectric component so that the blind hole of the bracket faces upward, and then the isolation base can be sleeved into the blind hole to fixedly assemble and nest the piezoelectric component with the piezoelectric component. Furthermore, the small-sized isolated acceleration sensor of the present application can embed the isolation base into the blind hole at the bottom of the bracket of the piezoelectric component, thereby realizing the nested assembly and fixation of the isolation base and the piezoelectric component. In this way, while insulating and isolating the piezoelectric component from the measured structure by using the isolation base, the isolation base can be fixedly assembled and nested with the piezoelectric component to reduce the volume of the isolated acceleration sensor and meet the installation requirements in a limited and narrow space.

[0023] In an alternative embodiment, after inverting the bracket of the piezoelectric component so that the blind hole of the bracket faces upward and before sleeving the isolation base into the blind hole to fixedly assemble and nest the piezoelectric component with the piezoelectric component, the method further includes:

[0024] Install an insulating gasket ring into the blind hole and coaxially mount the insulating gasket ring to the bottom of the bracket in the blind hole;

[0025] Press the isolation base into the insulating gasket ring, coaxially mount the isolation base and the insulating gasket ring to the bottom of the bracket, and make the isolation base have an interference fit with the piezoelectric component through the insulating gasket ring.

[0026] This alternative embodiment can install the insulating gasket ring into the blind hole and coaxially mount the insulating gasket ring to the bottom of the bracket in the blind hole. Then, the isolation base can be pressed into the insulating gasket ring, coaxially mount the isolation base and the insulating gasket ring to the bottom of the bracket, and make the isolation base have an interference fit with the piezoelectric component through the insulating gasket ring. On the one hand, this alternative embodiment method can insulate and isolate the isolation base from the blind hole of the piezoelectric component through the insulating gasket ring. On the other hand, it can make the isolation base have an interference fit with the piezoelectric component, thereby increasing the overall fixing stiffness of the isolated acceleration sensor through the interference fit and enabling the isolated acceleration sensor to meet the requirements of high installation resonance and high-frequency frequency response.

[0027] In an alternative embodiment, after sleeving the isolation base into the blind hole to fixedly assemble and nest the piezoelectric component with the piezoelectric component, the method further includes:

[0028] Fill glue in the gap between the bracket and the isolation base.

[0029] This optional implementation can fill the gap between the bracket and the isolation base with glue. Thus, on the premise of using an insulating gasket to improve the overall fixing stiffness of the isolated accelerometer, the gap between the bracket and the isolation base can be filled with glue, further fastening the isolation base to the piezoelectric component, thereby further improving the overall fixing stiffness of the isolated accelerometer. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 FIG. 1 is a three-dimensional schematic diagram of a small-volume isolated accelerometer disclosed in an embodiment of the present application;

[0032] Figure 2 FIG. 2 is an exploded schematic diagram of a small-volume isolated accelerometer disclosed in an embodiment of the present application;

[0033] Figure 3 FIG. 3 is a cross-sectional view of a small-volume isolated accelerometer disclosed in an embodiment of the present application;

[0034] Figure 4 FIG. 4 is an exploded schematic diagram of another small-volume isolated accelerometer disclosed in an embodiment of the present application;

[0035] Figure 5 FIG. 5 is a cross-sectional view of another small-volume isolated accelerometer disclosed in an embodiment of the present application;

[0036] Figure 6 FIG. 6 is an exploded schematic diagram of yet another small-volume isolated accelerometer disclosed in an embodiment of the present application;

[0037] Figure 7 FIG. 7 is a cross-sectional view of yet another small-volume isolated accelerometer disclosed in an embodiment of the present application.

[0038] Reference numerals: 1 - isolation base; 2 - insulating gasket; 3 - insulating sheet; 4 - piezoelectric component; 401 - blind hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. The components of the embodiments of this application usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0040] In the description of this application, it should be noted that the orientation or positional relationship indicated by terms such as "inside" and "outside" is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In addition, terms such as "first" and "second" are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0041] In the description of this application, it should also be noted that unless otherwise clearly specified and limited, the terms "set" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0042] Embodiment 1

[0043] Please refer to Figure 1 and Figure 2 , Figure 1 which is a three-dimensional schematic diagram of a small-volume isolated acceleration sensor disclosed in the embodiments of this application, Figure 2 and Figure 1 is an exploded schematic diagram of a small-volume isolated acceleration sensor disclosed in the embodiments of this application. As shown in Figure 2 and

[0044] The small-volume isolated acceleration sensor of the embodiments of this application includes an isolation base 1 and a piezoelectric component 4. The isolation base 1 is used to insulate and isolate the piezoelectric component 4 from the measured structure, that is, the piezoelectric component 4 is isolated from the ground through the isolation base 1. Among them, being isolated from the ground can refer to being isolated from the surface of the measured part. Isolating the piezoelectric component 4 from the measured structure through the isolation base 1 can avoid such interference signals from being directly connected to the acquisition system when the measured structure has strong electromagnetic interference or the surface of the measured structure is charged. Especially when there is grounding in other places in the test chain, it will introduce ground loop noise and affect the acquisition result of the data.Furthermore, the piezoelectric component 4 includes a bracket. A blind hole 401 is provided at the bottom of the bracket. The isolation base 1 is embedded in the blind hole 401 for nested assembly and fixation with the piezoelectric component 4. Specifically, since the blind hole 401 at the bottom of the piezoelectric component 4 forms an installation space for the isolation base 1, the isolation base 1 can be nested into this installation space, thereby avoiding an increase in the overall volume of the sensor.

[0045] In the small-volume isolated acceleration sensor according to the embodiment of the present application, the isolation base 1 can be nested and assembled and fixed with the piezoelectric component 4 by being embedded in the blind hole 401 at the bottom of the bracket of the piezoelectric component 4. In this way, while using the isolation base 1 to insulate and isolate the piezoelectric component 4 from the measured structure, the isolation base 1 and the piezoelectric component 4 can be nested and assembled and fixed to reduce the volume of the isolated acceleration sensor and meet the installation requirements in a limited and narrow space.

[0046] In some alternative embodiments, please refer to Figure 3 , Figure 3 which is a cross-sectional view of a small-volume isolated acceleration sensor disclosed in the embodiment of the present application. As shown at A in Figure 3 , the piezoelectric component and the isolation base are assembled in an interference fit manner.

[0047] In some alternative embodiments, please refer to Figure 4 , Figure 4 which is an exploded view of another small-volume isolated acceleration sensor disclosed in the embodiment of the present application. As shown in Figure 4 , the small-volume isolated acceleration sensor further includes an insulating sheet 3. The insulating sheet 3 is installed at the bottom of the blind hole 401. Among them, the bottom surface of the insulating sheet 3 abuts against the top of the isolation base 1, and the top surface of the insulating sheet 3 abuts against the blind hole 401, so that the top of the isolation base 1 is insulated and isolated from the piezoelectric component 4.

[0048] In this alternative embodiment, through the insulating sheet 3, the top of the isolation base 1 can be insulated and isolated from the piezoelectric component 4. On the other hand, the insulating sheet 3 can axially limit the isolation base 1. Further, please refer to Figure 5 , Figure 5 which is a cross-sectional view of another small-volume isolated acceleration sensor disclosed in the embodiment of the present application. As shown at A in Figure 5 , the piezoelectric component and the isolation base are assembled by gluing.

[0049] In an alternative embodiment, please refer to Figure 6 , Figure 6 which is an exploded view of yet another small-volume isolated acceleration sensor disclosed in the embodiment of the present application. As shown in Figure 6As shown, the small-sized isolated acceleration sensor further includes an insulating gasket ring 2. The insulating gasket ring 2 further improves the insulation performance and facilitates the interference fit between the piezoelectric component and the isolation base. Specifically, please refer to Figure 7 , Figure 7 which is a cross-sectional view of another small-sized isolated acceleration sensor disclosed in an embodiment of the present application. As Figure 7 shown, at position A, the isolation base 1 is in interference fit with the piezoelectric component 4 through the insulating gasket ring 2. On the other hand, as Figure 7 shown at B in

[0050] , the piezoelectric component and the isolation base are further fixed by gluing. That is, glue is filled in the gap between the bracket and the isolation base 1. Thus, on the premise of using the insulating gasket ring 2 to improve the overall fixing stiffness of the isolated acceleration sensor, the gap between the bracket and the isolation base 1 is filled with glue, so that the isolation base 1 and the piezoelectric component 4 are further fastened by the gluing of the glue, thereby further improving the overall fixing stiffness of the isolated acceleration sensor.

[0051] In an alternative embodiment, the insulating gasket ring 2 includes a circular ring or a slotted circular ring structure, and the isolation base 1 is crimped with the insulating gasket ring 2 through the circular ring or the slotted circular ring structure.

[0052] In this alternative embodiment, the isolation base 1 and the insulating gasket ring 2 can be crimped through the circular ring or the slotted circular ring structure.

[0053] In an alternative embodiment, the insulating gasket ring 2 is a metal material with its surface insulated.

[0054] In this alternative embodiment, using a metal material with its surface insulated as the insulating gasket ring 2 can achieve the insulation isolation function of the insulating gasket ring 2. At the same time, the advantage of the relatively high stiffness of the metal material can be utilized to improve the overall fixing stiffness of the sensor.

[0055] Embodiment 2

[0056] An embodiment of the present application provides an assembly method for an isolated acceleration sensor. The method is applied to the small-sized isolated acceleration sensor according to any one of the foregoing embodiments. The method of the embodiment of the present application includes the following steps:

[0057] Invert the bracket of the piezoelectric component 4 so that the blind hole 401 of the bracket faces upward;

[0058] Insert the isolation base 1 into the blind hole 401 so that the piezoelectric component 4 is nested and assembled and fixed with the piezoelectric component 4.

[0059] The method of the embodiment of the present application can invert the bracket of the piezoelectric component 4 so that the blind hole 401 of the bracket faces upward, and then the isolation base 1 can be inserted into the blind hole 401 so that the piezoelectric component 4 is nested and assembled and fixed with the piezoelectric component 4. Furthermore, the small-volume isolation type acceleration sensor of the present application can embed the isolation base 1 into the blind hole 401 at the bottom of the bracket of the piezoelectric component 4, so as to realize the nested assembly and fixation of the isolation base 1 and the piezoelectric component 4. In this way, while using the isolation base 1 to insulate and isolate the piezoelectric component 4 from the measured structure, the isolation base 1 and the piezoelectric component 4 can be nested and assembled and fixed, reducing the volume of the isolation type acceleration sensor and meeting the installation requirements in a limited and narrow space.

[0060] In an alternative embodiment, after inverting the bracket of the piezoelectric component 4 so that the blind hole 401 of the bracket faces upward and before inserting the isolation base 1 into the blind hole 401 so that the piezoelectric component 4 is nested and assembled and fixed, the method further includes:

[0061] Insert the insulating gasket ring 2 into the blind hole 401 and coaxially install the insulating gasket ring 2 to the bottom of the bracket with the blind hole 401.

[0062] Press the isolation base 1 into the insulating gasket ring 2, coaxially install the isolation base 1 and the insulating gasket ring 2 to the bottom of the bracket, and make the isolation base 1 have an interference fit with the piezoelectric component 4 through the insulating gasket ring 2.

[0063] This alternative embodiment can insert the insulating gasket ring 2 into the blind hole 401 and coaxially install the insulating gasket ring 2 to the bottom of the bracket with the blind hole 401, and then press the isolation base 1 into the insulating gasket ring 2, coaxially install the isolation base 1 and the insulating gasket ring 2 to the bottom of the bracket, and make the isolation base 1 have an interference fit with the piezoelectric component 4 through the insulating gasket ring 2. On the one hand, this alternative embodiment method can insulate and isolate the isolation base 1 from the blind hole 401 of the piezoelectric component 4 through the insulating gasket ring 2. On the other hand, it can make the isolation base 1 have an interference fit with the piezoelectric component 4, thereby making the overall fixed stiffness of the isolation type acceleration sensor through the interference fit and enabling the isolation type acceleration sensor to meet the requirements of high installation resonance and high-frequency frequency response.

[0064] In an alternative embodiment, after inserting the isolation base 1 into the blind hole 401 so that the piezoelectric component 4 is nested and assembled and fixed, the method of the embodiment of the present application further includes the following steps:

[0065] Fill glue in the gap between the bracket and the isolation base 1.

[0066] This optional embodiment can fill glue in the gap between the bracket and the isolation base 1. Furthermore, on the premise of using the insulating gasket 2 to improve the overall fixing stiffness of the isolated accelerometer, the gap between the bracket and the isolation base 1 can be filled with glue, so that the isolation base 1 and the piezoelectric component 4 are further fastened, thereby further improving the overall fixing stiffness of the isolated accelerometer.

[0067] It should be noted that, without conflict, the features in the embodiments of the present application can be combined with each other.

[0068] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A small-volume isolated acceleration sensor, characterized in that: include: An isolation base and a piezoelectric component, wherein the isolation base is used to insulate and isolate the piezoelectric component from the structure under test; The piezoelectric component comprises a bracket, a blind hole is provided at the bottom of the bracket, and the isolation base is embedded in the blind hole to be nested, assembled and fixed with the piezoelectric component.

2. The small-volume isolated acceleration sensor according to claim 1, characterized in that: It also includes an insulating gasket, through which the isolation base is interference-fitted with the piezoelectric component.

3. The small volume isolated acceleration sensor as claimed in claim 2, characterized in that: The insulating gasket ring comprises a circular ring, and the isolation base is crimped to the insulating gasket ring through the circular ring.

4. The small-volume isolated acceleration sensor according to claim 2, characterized in that: The insulating gasket ring comprises a slotted circular ring structure, and the isolation base is crimped with the insulating gasket ring through the slotted circular ring structure.

5. The small-volume isolated acceleration sensor according to claim 2, characterized in that: The insulating gasket is made of a metal material with an insulating surface.

6. The small-volume isolated acceleration sensor according to claim 1, characterized in that: The gap between the bracket and the isolation base is filled with glue.

7. The small-volume isolated acceleration sensor according to claim 1, characterized in that: Also included is an insulating sheet; The insulating sheet is installed at the bottom of the blind hole, wherein the bottom surface of the insulating sheet abuts against the top of the isolation base, and the top surface of the insulating sheet abuts against the blind hole, so that the top of the isolation base is insulated and isolated from the piezoelectric component.

8. A method for assembling an isolated acceleration sensor, characterized in that: The method is applied to the small-volume isolated acceleration sensor according to any one of claims 1 to 7, and the method comprises: Inverting the support of the piezoelectric assembly so that the blind hole of the support faces upward; The isolation base is inserted into the blind hole so that the piezoelectric components are nested, assembled and fixed.

9. The method according to claim 8, characterized in that After the support of the piezoelectric component is inverted so that the blind hole of the support faces upward, and before the isolation base is inserted into the blind hole so that the piezoelectric component is nested and assembled with the piezoelectric component, the method further includes: Installing an insulating gasket into the blind hole, so that the insulating gasket and the blind hole are coaxially mounted to the bottom of the bracket; The isolation base is pressed into the insulating gasket, so that the isolation base and the insulating gasket are coaxially installed to the bottom of the bracket, and the isolation base is interference-fitted with the piezoelectric component through the insulating gasket.

10. The method according to claim 8, characterized in that After inserting the isolation base into the blind hole so that the piezoelectric component is nested and assembled with the piezoelectric component, the method further includes: The gap between the bracket and the isolation base is filled with glue.

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