CN215953659U - Charge output element and piezoelectric acceleration sensor - Google Patents

Abstract

The utility model relates to a charge output element and a piezoelectric acceleration sensor. The support includes adapting unit, and piezoelectric assembly cup joints on adapting unit, and piezoelectric assembly includes two at least piezoelectric element, and two at least piezoelectric element distribute along adapting unit circumference, and the mass block subassembly cup joints at piezoelectric assembly's outer peripheral face, and the pretension ring cup joints in the periphery of mass block subassembly wherein, and piezoelectric assembly and mass block subassembly are fixed in adapting unit through the pretension ring. The utility model can ensure the rigidity of the charge output element, thereby improving the frequency response characteristic and resonance of the piezoelectric acceleration sensor.

Description

Charge output element and piezoelectric acceleration sensor

Technical Field

The utility model relates to the technical field of sensors, in particular to a charge output element and a piezoelectric acceleration sensor.

Background

The piezoelectric acceleration sensor is also called as a piezoelectric accelerometer, and also belongs to an inertial sensor. The principle of the piezoelectric acceleration sensor is that the piezoelectric effect of the piezoelectric element is utilized, and when the accelerometer is vibrated, the force of the mass block on the piezoelectric element is changed. When the measured vibration frequency is much lower than the natural frequency of the accelerometer, then the force change is directly proportional to the measured acceleration.

Be provided with charge output element in the piezoelectricity acceleration sensor, among the prior art, adopt the connecting layer to connect between each part of charge output element, though can make each part assembly combination of charge output element through the mode that the connecting layer is connected, but adopt the connecting layer to connect the mode extremely high to the quality and the assembly operation requirement of connecting layer, misoperation when containing impurity in the connecting layer or assembling, then can lead to the joint strength low between each part of charge output element, make charge output element's bulk rigidity not enough, and then lead to piezoelectricity acceleration sensor's frequency response characteristic and resonance to hang down.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a charge output element and a piezoelectric acceleration sensor, which can ensure the rigidity of the charge output element, and further improve the frequency response characteristic and resonance of the piezoelectric acceleration sensor.

In one aspect, an embodiment of the present invention provides a charge output device, including a support, a piezoelectric assembly, a mass assembly, and a pre-tightening ring. The support includes adapting unit, and piezoelectric assembly cup joints on adapting unit, and piezoelectric assembly includes two at least piezoelectric element, and two at least piezoelectric element distribute along adapting unit circumference, and the mass block subassembly cup joints at piezoelectric assembly's outer peripheral face, and the pretension ring cup joints in the periphery of mass block subassembly wherein, and piezoelectric assembly and mass block subassembly are fixed in adapting unit through the pretension ring.

According to an aspect of the present invention, the mass block assembly includes at least two mass blocks, each mass block is distributed around the piezoelectric assembly, and at least one mass block is correspondingly disposed on an outer circumferential surface of each piezoelectric element.

According to an aspect of the present invention, the piezoelectric assembly, the mass block assembly, and the pre-tightening ring are each in an annular structure, and at least two piezoelectric elements constituting the piezoelectric assembly are integrally distributed in an annular shape on the outer periphery of the connecting member, the piezoelectric elements constituting the segmented structure of the annular member.

According to an aspect of the utility model, the pre-tightening ring is a heat-shrinkable or cold-shrink ring.

According to an aspect of the present invention, the bracket further includes a support member, the connection member has a columnar structure, and the support member is a disk-like structure disposed around the connection member and located at one end of the connection member.

On the other hand, the embodiment of the utility model also provides a piezoelectric acceleration sensor, which comprises the charge output element, a shell and a signal output assembly. The shell is provided with a hollow accommodating space, the charge output element is arranged in the accommodating space, the signal output assembly is arranged outside the shell and is electrically connected with the charge output element, and the signal output assembly comprises a connector formed outside the shell and a cable electrically connecting the connector and the charge output element.

According to another aspect of the present invention, the housing has openings at both ends thereof, the receiving space is penetrated through the openings, the openings are respectively provided with the upper cover and the support member, and the connecting member has a columnar structure, wherein the support member is a disk-like structure disposed around the connecting member and is located at one end of the connecting member.

According to another aspect of the present invention, both ends of the cable are provided with a first terminal and a second terminal, respectively, and one end of the cable is fixedly connected to the housing through the first terminal and the other end is fixed to the connector through the second terminal.

According to another aspect of the present invention, the connector includes a sleeve, a circuit board and a conductive terminal, the sleeve has a hollow accommodating space and at least one end has an opening, the circuit board is disposed in the sleeve, the conductive terminal is disposed in the opening and closes the accommodating space, and the conductive terminal is electrically connected to the cable through the circuit board.

According to another aspect of the present invention, a pre-tightening sleeve is disposed at a connection portion of the cable and the first and second terminals, and the pre-tightening sleeve is a heat-shrinkable sleeve or a cold-shrinkable sleeve.

The charge output element provided by the embodiment of the utility model comprises a support, a piezoelectric assembly and a mass block assembly, wherein the piezoelectric assembly and the mass block assembly are fixed on a connecting part through a pre-tightening ring and are not connected with each other, namely the piezoelectric assembly, the mass block assembly and the support are in rigid contact, the connecting strength is high, the overall rigidity of the charge output element can be effectively improved, and the frequency response characteristic and the resonance of a piezoelectric acceleration sensor are improved. In addition, the piezoelectric assembly comprises at least two piezoelectric elements, so that the mass block assembly, the piezoelectric assembly and the support are convenient to assemble, and the assembling efficiency of the charge output element can be improved.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic perspective view of a charge output element according to an embodiment of the present invention;

fig. 2 shows a schematic cross-sectional structure of the charge output element of fig. 1;

fig. 3 shows a schematic structural view of a support of the charge output element of fig. 1;

fig. 4 shows a schematic structural view of a piezoelectric assembly of the charge output element of fig. 1;

FIG. 5 shows a schematic diagram of the pre-tensioning loop of the charge output element of FIG. 1;

FIG. 6 shows a schematic structural diagram of a mass block assembly of the charge output element of FIG. 1;

fig. 7 shows a schematic perspective view of a piezoelectric acceleration sensor according to an embodiment of the present invention;

fig. 8 shows a schematic cross-sectional structure diagram of a piezoelectric acceleration sensor according to an embodiment of the present invention.

Wherein:

10-charge output element, 11-support, 111-connecting member, 112-support member, 12-preload ring, 13-piezoelectric element, 14-mass;

20-piezoelectric acceleration sensor, 21-shell, 211-upper cover, 22-connector, 221-sleeve, 222 circuit board, 223 conductive terminal, 23-cable, 231-first terminal, 232-second terminal, and 24-pre-tightening sleeve.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not to be construed as limiting the utility model. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

It will be understood that when a layer, region or layer is referred to as being "on" or "over" another layer, region or layer in describing the structure of the component, it can be directly on the other layer, region or layer or intervening layers or regions may also be present. Also, if the component is turned over, one layer or region may be "under" or "beneath" another layer or region.

Referring to fig. 1 to 5 together, fig. 1 illustrates a schematic perspective structure of a charge output device according to an embodiment of the present invention, fig. 2 illustrates a schematic cross-sectional structure of the charge output device of fig. 1, fig. 3 illustrates a schematic structural diagram of a support of the charge output device of fig. 1, fig. 4 illustrates a schematic structural diagram of a piezoelectric element of the charge output device of fig. 1, and fig. 5 illustrates a schematic structural diagram of a pre-tightening ring of the charge output device of fig. 1. The structural schematic diagrams in the application are all schematic diagrams on the structural principle, and the actual size, the detail position and the like of each part contained in the charge output element can be adjusted according to the actual situation.

The embodiment of the utility model provides a charge output element 10, which comprises a bracket 11, a piezoelectric assembly, a mass block assembly and a pre-tightening ring 12.

The support 11 comprises a connecting part 111 and a piezoelectric assembly sleeved on the connecting part 111, the piezoelectric assembly comprises at least two piezoelectric elements 13, the at least two piezoelectric elements 13 are distributed along the circumferential direction of the connecting part 111, the mass block assembly is sleeved on the outer circumferential surface of the piezoelectric assembly, and the pre-tightening ring 12 is sleeved on the outer circumferential surface of the mass block assembly; the piezoelectric assembly and the mass assembly are fixed to the connecting member 111 through the pre-tightening ring 12.

The charge output element provided by the embodiment of the utility model comprises a support 11, a piezoelectric assembly and a mass block assembly, wherein the piezoelectric assembly and the mass block assembly are fixed on a connecting part 111 through a pre-tightening ring 12 and are not connected with each other, namely the piezoelectric assembly, the mass block assembly and the support are in rigid contact, the connecting strength is high, the integral rigidity of the charge output element can be effectively improved, and the frequency response characteristic and the resonance of a piezoelectric acceleration sensor are improved.

In addition, the piezoelectric assembly comprises at least two piezoelectric elements 13, so that the assembly among the mass block assembly, the piezoelectric assembly and the support 11 is facilitated, and the assembly efficiency of the charge output element can be improved.

It is understood that the piezoelectric assembly includes at least two piezoelectric elements 13, and the number of the piezoelectric elements 13 can be selected according to actual needs, which is not specifically limited in the present application.

Alternatively, the support 11 may be INCONEL, which ensures that the charge delivery element 1 has a linear modulus of elasticity at high temperatures.

The piezoelectric assembly may be made of piezoelectric ceramics, and includes an inner circumferential surface and an outer circumferential surface opposite to each other, the inner circumferential surface and the outer circumferential surface are provided with conductive layers for facilitating transmission of an electrical signal of the piezoelectric element 13, and the conductive layers may be gold plating layers.

The mass block component can be made of tungsten alloy or 16L stainless steel, and has strong corrosion resistance and heat resistance.

It will be appreciated that the diameter of the inner circumferential surface of the preload ring 12 is smaller than the diameter of the outer circumferential surface of the mass assembly so that the preload ring and the mass assembly are an interference fit.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a mass block assembly of the charge output device of fig. 1.

In some alternative embodiments, the mass assembly includes at least two masses 14, each mass 14 is distributed around the piezoelectric assembly, and at least one mass 14 is correspondingly disposed on the outer periphery of each piezoelectric element 13. Each mass block 14 is arranged on the outer peripheral surface of the piezoelectric element 13, which is equivalent to that the whole mass block assembly is arranged in a disconnected manner in the circumferential direction, so that the position of each mass block 14 is convenient to adjust, and the interference fit between each mass block 14 and the piezoelectric element is realized.

It is understood that the mass assembly includes at least two masses 14, and the number of the masses 14 can be selected according to actual needs, which is not specifically limited in this application.

In some alternative embodiments, the piezoelectric assembly, the mass assembly, and the pre-tightening ring 12 are all in an annular structure, at least two piezoelectric elements 13 constituting the piezoelectric assembly are integrally distributed in an annular shape on the periphery of the connecting part 111, and the piezoelectric elements 13 constitute a segmented structure of the annular structure, so as to facilitate processing and assembly.

Optionally, the piezoelectric element assembly and the mass assembly are further circular ring-shaped structures to facilitate processing and assembly.

Of course, the structures of the piezoelectric module and the mass module are not limited to the circular ring structures, and polygonal ring structures may be used correspondingly.

Specifically, the piezoelectric assembly includes two semicircular piezoelectric elements 13, and the mass block assembly includes two semicircular masses 14 to facilitate processing and assembly.

In some optional embodiments, the pre-tightening ring 12 is a heat-shrinkable sleeve or a cold-shrinkable sleeve, and the heat-shrinkable sleeve and the cold-shrinkable sleeve are conveniently fixed and are easy to operate.

Optionally, the material of the heat-shrinkable ring can be nickel titanium memory alloy, and the heat-shrinkable ring is subjected to cold expansion and heat shrinkage. The thermal shrinkage ring of this embodiment can increase the pretightning force at the outer peripheral face of quality piece 14 for adapting to each other of adapting unit 11, piezoelectric assembly and quality piece subassembly, so as to strengthen the holistic rigidity of charge output element.

In some optional embodiments, the bracket 11 further includes a supporting member 112, and the supporting member 112 is a disk-like structure disposed around the connecting member 111 and is located at one end of the connecting member 111.

Alternatively, the connecting member 111 may have a columnar structure to facilitate processing and assembly.

Referring to fig. 7 and 8, fig. 7 is a schematic perspective view of a piezoelectric acceleration sensor according to an embodiment of the present invention, and fig. 8 is a schematic cross-sectional view of the piezoelectric acceleration sensor according to the embodiment of the present invention.

The embodiment of the present invention further provides a piezoelectric acceleration sensor 20, which includes the above-mentioned charge output element 10, a housing 21, and a signal output component.

The housing 21 has a hollow accommodating space, the charge output element 10 is disposed in the accommodating space, the signal output unit is disposed outside the housing and electrically connected to the charge output element 10, and the signal output unit 10 includes a connector 22 formed outside the housing and a cable 23 electrically connecting the connector 22 and the charge output element 10.

In some alternative embodiments, the housing 21 has openings at both ends thereof, and the accommodating space is penetrated through the openings, and the openings are respectively provided with the upper cover 211 and the supporting member, wherein the supporting member may be the supporting member 112 of the charge output element 10. The housing 21 can protect the charge output element 10 in the accommodating space and can shield external signals to some extent.

It will be appreciated that the outer contours of the upper cover 211 and the support member 112 correspond to the inner contour of the opening, so that the upper cover 211 and the support member 112 can conveniently close the receiving space. In addition, the supporting component can be the supporting component 112 of the charge output element 10, and the supporting component 112 of the charge output element 10 is used for replacing other sealing covers, so that the charge output element 10 is conveniently fixed in the accommodating space, the installation process of the charge output element 10 is simplified, materials can be saved, and the cost can be reduced.

In some alternative embodiments, the two ends of the cable 23 are respectively provided with a first terminal 231 and a second terminal 232, one end of the cable 23 is fixedly connected to the housing 21 through the first terminal 231, and the other end is fixed to the connector 22 through the second terminal 232.

Alternatively, the first terminal 231 and the second terminal 232 may be connection sleeves, the first terminal 231 and the second terminal 232 may be fixedly connected to the housing 21 and the connector 22 by welding, and the first terminal 231 and the second terminal 232 may be fixedly connected to the cable by welding.

It will be appreciated that to increase the stability of the connection of the cable 23 to the housing 21 and connector 22, the cable 23 extends partially into the housing 21 and connector 22.

In some alternative embodiments, the connector 22 includes a sleeve 221, a circuit board 222 and a conductive terminal 223, the sleeve 221 has a hollow accommodating space and at least one end has an opening, the circuit board 222 is disposed in the sleeve 221, the conductive terminal 223 is disposed in the opening and closes the accommodating space, and the conductive terminal 223 is electrically connected to the cable 23 through the circuit board 222.

By arranging the circuit board 222, weak electric signals generated after the piezoelectric element 13 is stressed can be processed, so that the piezoelectric acceleration sensor forms a voltage output type piezoelectric acceleration sensor to meet the use requirement.

It is understood that the circuit board 222 is not limited to use with a printed circuit board, and in alternative embodiments, the circuit board 222 may be a thick film circuit board, which is small and lightweight.

In some optional embodiments, a pre-tightening sleeve 24 is disposed at the connection between the cable 23 and the first and second terminals 231 and 232 to increase the connection stability between the cable 23 and the first and second terminals 231 and 232.

Optionally, the pre-tightening sleeve 24 may be a heat-shrinkable sleeve or a cold-shrink sleeve, and the heat-shrinkable sleeve and the cold-shrink sleeve are conveniently fixed and are easy to operate. Optionally, the material of the heat-shrinkable sleeve ring can be nickel-titanium memory alloy, and the heat-shrinkable sleeve ring is subjected to cold expansion treatment and heat shrinkage.

In accordance with the above-described embodiments of the present invention, these embodiments do not set forth all of the details or limit the utility model to the specific embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best utilize the utility model and various embodiments with various modifications as are suited to the particular use contemplated. The utility model is limited only by the claims and their full scope and equivalents.

Claims (10)

1. A charge output element, comprising:

a bracket including a connection member;

the piezoelectric assembly is sleeved on the connecting part and comprises at least two piezoelectric elements which are distributed along the circumferential direction of the connecting part;

the mass block assembly is sleeved on the peripheral surface of the piezoelectric assembly;

the pre-tightening ring is sleeved on the peripheral surface of the mass block assembly;

the piezoelectric assembly and the mass block assembly are fixed on the connecting component through the pre-tightening ring.

2. The charge output element according to claim 1, wherein the mass block assembly comprises at least two mass blocks, each of the mass blocks is distributed around the piezoelectric assembly, and at least one of the mass blocks is provided on an outer peripheral surface of each of the piezoelectric elements.

3. The charge output element according to claim 2, wherein the piezoelectric assembly, the mass assembly, and the pre-tightening ring are each an annular structure;

the whole of at least two piezoelectric elements forming the piezoelectric component are distributed in a ring shape on the periphery of the connecting part;

the piezoelectric element constitutes a segmented structure of the annular member.

4. A charge output element according to any of claims 1 to 3, wherein the pre-tightening ring is a heat-shrink or cold-shrink ring.

5. A charge output element according to any one of claims 1 to 3, wherein the holder further comprises a support member, the connecting member has a columnar structure, and the support member is a disk-like structure provided around the connecting member and located at one end of the connecting member.

6. A piezoelectric acceleration sensor, characterized by comprising:

the charge output element according to any one of claims 1 to 4;

a housing having a hollow accommodating space in which the charge output element according to any one of claims 1 to 4 is disposed;

and the signal output assembly is arranged outside the shell and is electrically connected with the charge output element, and the signal output assembly comprises a connector formed outside the shell and a cable electrically connected with the connector and the charge output element.

7. The piezoelectric acceleration sensor according to claim 6, wherein the housing has openings at both ends thereof, the accommodation space is penetrated through the openings, and an upper cover and a support member are respectively provided on the openings, wherein the support member is a disk-like structure provided around the connection member and is located at one end of the connection member.

8. The piezoelectric acceleration sensor according to claim 6, characterized in that both ends of the cable are provided with a first terminal and a second terminal, respectively, and one end of the cable is fixedly connected to the housing through the first terminal and the other end is fixed to the connector through the second terminal.

9. The piezoelectric acceleration sensor according to claim 6, wherein the connector includes a sleeve having a hollow receiving space and having an opening at least one end, a circuit board disposed in the sleeve, and a conductive terminal disposed in the opening and closing the receiving space, the conductive terminal being electrically connected to the cable through the circuit board.

10. The piezoelectric acceleration sensor according to claim 8, characterized in that a pre-tightening sleeve is provided at the connection of the cable with the first terminal and the second terminal;

the pre-tightening sleeve is a heat-shrinkable sleeve or a cold-shrinkable sleeve.

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