Piezoelectric stacking device for realizing deflection motion

Abstract

The utility model discloses a piezoelectric stacking device capable of realizing deflection motion. The piezoelectric stacking device comprises at least two first electrode layers, at least one second electrode layer and at least two piezoelectric dielectric layers, the first electrode layers and the second electrode layers are alternately stacked in the first direction, and the piezoelectric dielectric layer is located between any adjacent first electrode layer and second electrode layer; the first electrode layer comprises a first electrode plate and a second electrode plate which are arranged on the same layer, and the first electrode plate and the second electrode plate are arranged in an insulating manner; the piezoelectric stacking device further comprises a through hole penetrating through the piezoelectric stacking device in the first direction. According to the utility model, a three-wire system power supply mode can be adopted, installation and fixation are facilitated through the arrangement of the through holes penetrating through the piezoelectric stacking device, and the problems of complex wiring and complex mechanical installation mode of the existing piezoelectric stacking device are solved while deflection motion is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of piezoelectric stacks, in particular to a piezoelectric stack device for realizing deflection motion. Background Art

[0002] Piezoelectric materials are widely used in sensing and driving fields, and piezoelectric stacks are one of the most widely used forms of piezoelectric materials.

[0003] Although the existing piezoelectric stack device can realize deflection motion, since each electrode layer is composed of two mutually insulated electrode sheets, its power supply method usually adopts a four-wire system, which has many wirings and complex mechanical installation methods.

[0004] Therefore, there is an urgent need for a piezoelectric stack device to solve the above problems. Utility Model Content

[0005] The utility model provides a piezoelectric stack device for realizing deflection motion, so as to solve the problems of complicated wiring and complicated mechanical installation of the existing piezoelectric stack device.

[0006] The embodiment of the utility model provides a piezoelectric stack device, which comprises at least two first electrode layers, at least one second electrode layer and at least two piezoelectric dielectric layers;

[0007] Along a first direction, the first electrode layers and the second electrode layers are alternately stacked, and the piezoelectric dielectric layer is located between any adjacent first electrode layers and second electrode layers;

[0008] The first electrode layer includes a first electrode sheet and a second electrode sheet arranged in the same layer, and the first electrode sheet and the second electrode sheet are insulated from each other;

[0009] The piezoelectric stack device also includes a through hole;

[0010] Along the first direction, the through hole penetrates the piezoelectric stack device.

[0011] Furthermore, the piezoelectric dielectric layer includes a first dielectric section and a second dielectric section arranged in the same layer;

[0012] Along the first direction, the first dielectric section at least partially overlaps with the first electrode sheet, and the second dielectric section at least partially overlaps with the second electrode sheet;

[0013] The polarization direction of the first dielectric portion is opposite to the polarization direction of the second dielectric portion.

[0014] Furthermore, the polarization direction of the first dielectric section is parallel to the first direction, and the polarization direction of the second dielectric section is parallel to the first direction.

[0015] Further, the piezoelectric stack device also includes a first lead, a second lead and a third lead;

[0016] The first lead is electrically connected to the first electrode sheet and is used to transmit a first voltage to the first electrode sheet;

[0017] The second lead is electrically connected to the second electrode sheet and is used to transmit a second voltage to the second electrode sheet;

[0018] The third lead is electrically connected to the second electrode layer and is used to transmit a third voltage to the second electrode layer;

[0019] Among them, V1>V2, V2=0V, V2≤V3≤V1, V1 represents the first voltage, V2 represents the second voltage, and V3 represents the third voltage.

[0020] Further, the through hole comprises an elliptical hole;

[0021] Alternatively, the through hole includes an oblong hole, and the oblong hole includes a first through hole section, a second through hole section and a third through hole section; the first through hole section and the second through hole section are located on two opposite sides of the third through hole section; the first through hole section includes a semicircular hole, the second through hole section includes a semicircular hole, and the third through hole section includes a rectangular hole.

[0022] Furthermore, the piezoelectric stack device further includes a first insulating layer and a second insulating layer;

[0023] Along the first direction, the first insulating layer and the second insulating layer are located at two opposite ends of the piezoelectric stack device.

[0024] The technical solution of the embodiment of the utility model provides a piezoelectric stack device for realizing deflection motion, the piezoelectric stack device includes at least two first electrode layers, at least one second electrode layer and at least two piezoelectric dielectric layers, wherein the first electrode layer and the second electrode layer are alternately stacked along the first direction, the piezoelectric dielectric layer is located between any adjacent first electrode layer and second electrode layer, the first electrode layer includes a first electrode sheet and a second electrode sheet arranged in the same layer, the first electrode sheet and the second electrode sheet are insulated, and the piezoelectric stack device also includes a through hole that penetrates the piezoelectric stack device along the first direction. The embodiment of the utility model adopts the above-mentioned piezoelectric stack device, and the deflection motion of the piezoelectric stack device can be realized by setting the voltage values ​​on the first electrode sheet, the second electrode sheet and the second electrode layer, that is, adopting a three-wire power supply method, and at the same time, by setting a through hole that penetrates the piezoelectric stack device, it is easy to install and fix, which solves the problem of complex wiring and complex mechanical installation methods of the existing piezoelectric stack device, and has the beneficial effects of simplifying the wiring method, reducing the difficulty of installation, and simplifying the control method.

[0025] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A three-dimensional assembly diagram of a piezoelectric stack device provided in an embodiment of the utility model;

[0028] Figure 2 A schematic diagram of the structure of a piezoelectric stack device provided in an embodiment of the utility model;

[0029] Figure 3 An electrical schematic diagram of a piezoelectric stack device provided by an embodiment of the utility model;

[0030] Figure 4 A top view of a piezoelectric stack device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only used to illustrate the relative positional relationship between each component or component, and does not particularly limit the specific installation orientation of each component or component.

[0033] Figure 1 A three-dimensional assembly diagram of a piezoelectric stack device provided by an embodiment of the utility model, Figure 2 A schematic diagram of a piezoelectric stack device provided in an embodiment of the utility model, referring to Figure 1 and Figure 2 The piezoelectric stack device in the embodiment of the utility model includes at least two first electrode layers 10, at least one second electrode layer 20 and at least two piezoelectric dielectric layers 30. Along the first direction Y, the first electrode layers 10 and the second electrode layers 20 are alternately stacked, and the piezoelectric dielectric layer 30 is located between any adjacent first electrode layers 10 and second electrode layers 20. The first electrode layer 10 includes a first electrode sheet 11 and a second electrode sheet 12 arranged in the same layer, and the first electrode sheet 11 and the second electrode sheet 12 are insulated. The piezoelectric stack device also includes a through hole 70, and along the first direction Y, the through hole 70 runs through the piezoelectric stack device.

[0034] Exemplarily, the two sides of any piezoelectric dielectric layer 30 are respectively the first electrode layer 10 and the second electrode layer 20, and any two adjacent piezoelectric dielectric layers 30 share one first electrode layer 10 or one second electrode layer 20. Each first electrode layer 10 includes a first electrode sheet 11 and a second electrode sheet 12 arranged in the same layer, and the first electrode sheet 11 and the second electrode sheet 12 arranged in the same layer are insulated from each other. By applying voltage to the first electrode sheet 11, the second electrode sheet 12 and the second electrode layer 20, and controlling the voltage difference between the first electrode sheet 11 and the second electrode layer 20 to be different from the voltage difference between the second electrode sheet 12 and the second electrode layer 20, the expansion and contraction amount of the piezoelectric dielectric layer 30 corresponding to the first electrode sheet 11 can be different from the expansion and contraction amount of the piezoelectric dielectric layer 30 corresponding to the second electrode sheet 12, so as to realize the deflection movement of the piezoelectric stack device. Specifically, the piezoelectric stack device in the embodiment of the utility model can adopt a three-wire power supply method, that is, all the first electrode sheets 11 are connected to the same lead, all the second electrode sheets 12 are connected to the same lead, and all the second electrode layers 20 are connected to the same lead. Under the premise of controlling the voltage applied to the first electrode sheets and the second electrode sheets to remain unchanged, the deflection movement of the piezoelectric stack device can be controlled by controlling the voltage applied to the second electrode layer.

[0035] The piezoelectric stack device in the embodiment of the utility model can realize deflection movement. In actual use, it is usually necessary to cooperate with an amplifying device or other linkage devices to realize the driving of the driven device. In order to facilitate its connection with other devices, the embodiment of the utility model provides a through hole 70 that penetrates the piezoelectric stack device. When it is necessary to connect with other devices, it is only necessary to provide a bolt with a size matching the through hole 70 to pass through the through hole 70 and fix it to other devices, so as to realize the connection between the piezoelectric stack device and other devices.

[0036] Compared with the prior art that adopts a four-wire power supply method, the embodiment of the utility model adopts a technical solution in which only the first electrode layer 10 includes a first electrode sheet 11 and a second electrode sheet 12 arranged on the same layer, and the second electrode layer 20 is arranged in a whole layer. This enables the piezoelectric stack device in the embodiment of the utility model to adopt a three-wire power supply method, which is simple to connect and is beneficial to reducing the production cost. In addition, the method for controlling the deflection movement of the piezoelectric stack device is also simpler, and only the voltage change applied to the second electrode layer needs to be controlled, which is beneficial to improving the accuracy and precision of the control.

[0037] refer to Figure 1 The piezoelectric dielectric layer 30 includes a first dielectric section 31 and a second dielectric section 32 arranged in the same layer. Along the first direction Y, the first dielectric section 31 at least partially overlaps with the first electrode sheet 11, and the second dielectric section 32 at least partially overlaps with the second electrode sheet 12. The polarization direction of the first dielectric section 31 is opposite to the polarization direction of the second dielectric section 32.

[0038] Specifically, the polarization direction of the first dielectric portion 31 is parallel to the first direction Y, and the polarization direction of the second dielectric portion 32 is parallel to the first direction Y.

[0039] In a feasible embodiment, the surface of the polarized first dielectric division 31 close to the first electrode sheet 11 accumulates negative charges, and the surface of the polarized first dielectric division 31 close to the second electrode sheet 20 accumulates positive charges, and the polarization direction thereof points from negative charges to positive charges, and is parallel to the first direction Y. The surface of the polarized second dielectric division 32 of the same layer close to the second electrode sheet 12 accumulates positive charges, and the surface of the polarized second dielectric division 32 far from the second electrode sheet 20 accumulates negative charges, and the polarization direction thereof points from negative charges to positive charges, and is also parallel to the first direction Y, but opposite to the polarization direction of the first dielectric division 31.

[0040] It should be noted that when the direction of the voltage applied to the first dielectric division 31 is the same as the polarization direction of the first dielectric division 31, the first dielectric division 31 will stretch, and when the direction of the voltage applied to the second dielectric division 32 is the same as the polarization direction of the second dielectric division 32, the second dielectric division 32 will stretch.

[0041] Figure 3 The electrical schematic diagram of a piezoelectric stack device provided by the embodiment of the utility model is shown in FIG. Figure 1-3 The piezoelectric stack device further includes a first lead 40 , a second lead 50 and a third lead 60 .

[0042] The first lead 40 is electrically connected to the first electrode sheet 11 and is used to transmit a first voltage to the first electrode sheet 11 .

[0043] The second lead 50 is electrically connected to the second electrode sheet 12 and is used for transmitting a second voltage to the second electrode sheet 12 .

[0044] The third lead 60 is electrically connected to the second electrode layer 20, and is used to transmit a third voltage to the second electrode layer 20. Wherein, V1>V2, V2=0V, V2≤V3≤V1, wherein V1 represents the first voltage, V2 represents the second voltage, and V3 represents the third voltage.

[0045] Take the example that the surface of the polarized first dielectric division 31 close to the first electrode sheet 11 accumulates negative charges, the surface of the polarized first dielectric division 31 close to the second electrode sheet 20 accumulates positive charges, the surface of the polarized second dielectric division 32 of the same layer close to the second electrode sheet 12 accumulates positive charges, and the surface of the polarized second dielectric division 32 away from the second electrode sheet 20 accumulates negative charges. Since the first voltage applied to the first electrode sheet 11 is greater than the third voltage applied to the second electrode layer 20, that is, the direction of the voltage applied to the first dielectric division 31 is the same as the polarization direction of the first dielectric division 31, the first dielectric division 31 will stretch. Since the second voltage applied to the second electrode sheet 11 is less than the third voltage applied to the second electrode layer 20, that is, the direction of the voltage applied to the second dielectric division 32 is the same as the polarization direction of the second dielectric division 32, the second dielectric division 32 will stretch. In this way, the magnitude relationship between the elongation of the first dielectric portion 31 and the elongation of the second dielectric portion 32 can be controlled by controlling the magnitude of the third voltage applied, thereby achieving control over the deflection movement of the piezoelectric stack device.

[0046] Specifically, when V3=V1 / 2, the magnitude of the voltage applied to the first dielectric division 31 is equal to the magnitude of the voltage applied to the second dielectric division 32, and in the first direction Y and the direction opposite to the first direction Y, the elongation of the first dielectric division 31 is equal to the elongation of the second dielectric division 32, and the piezoelectric stack device does not deflect.

[0047] When V2≤V3<V1 / 2, the voltage applied to the first dielectric division 31 is greater than the voltage applied to the second dielectric division 32, and in the first direction Y and the direction opposite to the first direction Y, the elongation of the first dielectric division 31 is greater than the elongation of the second dielectric division 32, and the piezoelectric stack device will deflect counterclockwise around the line of symmetry between the first dielectric division 31 and the second dielectric division 32.

[0048] When V1 / 2<V3≤V1, the voltage applied to the first dielectric division 31 is smaller than the voltage applied to the second dielectric division 32, and in the first direction Y and the direction opposite to the first direction Y, the elongation of the first dielectric division 31 is smaller than the elongation of the second dielectric division 32, and the piezoelectric stack device will deflect clockwise around the line of symmetry between the first dielectric division 31 and the second dielectric division 32.

[0049] Figure 4 A top view of a piezoelectric stack device provided in an embodiment of the utility model, referring to Figure 4The through hole 70 includes an oblong hole 71, and the oblong hole 71 includes a first through hole section 711, a second through hole section 712, and a third through hole section 713. The first through hole section 711 and the second through hole section 712 are located on two opposite sides of the third through hole section 713. The first through hole section 711 includes a semicircular hole, and the second through hole section 712 includes a semicircular hole. The third through hole section 713 includes a rectangular hole.

[0050] Figure 4 The through hole 70 shown is an oblong hole 71. It should be noted that the embodiment of the utility model does not limit the type of the through hole 70. In other feasible implementations, the through hole 70 can also be an elliptical hole.

[0051] It can be understood that in the piezoelectric dielectric layer 30, only the first dielectric section 31 corresponding to the first electrode sheet 11 and the second dielectric section 32 corresponding to the second electrode sheet 12 can expand and contract, while other dielectric sections except the first dielectric section 31 and the second dielectric section 32 will not expand and contract. The provision of the through hole 70 can also reduce the proportion of the dielectric part that cannot expand and contract in the piezoelectric dielectric layer 30, which is beneficial to improving the deflection capacity of the piezoelectric stack device. Compared with the technical solution of using a circular hole for the through hole 70, the embodiment of the utility model improves the provision of the through hole using an oblong hole or an elliptical hole, which can further reduce the proportion of the dielectric part that cannot expand and contract in the piezoelectric dielectric layer 30, and further improve the deflection capacity of the piezoelectric stack device.

[0052] Embodiments of the utility model Figure 1-4 The overall shape of the piezoelectric stack device shown is square. It should be noted that the embodiment of the utility model does not limit the overall shape of the piezoelectric stack device, and it can also be cylindrical. Those skilled in the art can set it according to actual needs.

[0053] refer to Figure 1 The piezoelectric stack device further includes a first insulating layer 80 and a second insulating layer 90. Along the first direction Y, the first insulating layer 80 and the second insulating layer 90 are located at two opposite ends of the piezoelectric stack device.

[0054] Figure 1 The first insulating layer 80 is arranged on the upper side of the Piezoelectric stack device, and the second insulating layer 90 is arranged on the lower side of the Piezoelectric stack device. The first insulating layer 80 and the second insulating layer 90 are used to prevent the Piezoelectric stack device from leaking electricity.

[0055] As a feasible implementation, the first insulating layer 80 and the second insulating layer 90 may be made of insulating ceramics. In other feasible implementations, the first insulating layer 80 and the second insulating layer 90 may also be made of other insulating materials, which is not limited in the embodiment of the utility model.

[0056] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A piezoelectric stack device for realizing deflection motion, characterized in that: comprising at least two first electrode layers, at least one second electrode layer and at least two piezoelectric dielectric layers; Along a first direction, the first electrode layers and the second electrode layers are alternately stacked, and the piezoelectric dielectric layer is located between any adjacent first electrode layers and second electrode layers; The first electrode layer includes a first electrode sheet and a second electrode sheet arranged in the same layer, and the first electrode sheet and the second electrode sheet are insulated from each other; The piezoelectric stack device also includes a through hole; Along the first direction, the through hole penetrates the piezoelectric stack device.

2. The piezoelectric stack device according to claim 1, characterized in that: The piezoelectric dielectric layer includes a first dielectric section and a second dielectric section arranged in the same layer; Along the first direction, the first dielectric section at least partially overlaps with the first electrode sheet, and the second dielectric section at least partially overlaps with the second electrode sheet; The polarization direction of the first dielectric portion is opposite to the polarization direction of the second dielectric portion.

3. The piezoelectric stack device according to claim 2, characterized in that: The polarization direction of the first dielectric section is parallel to the first direction, and the polarization direction of the second dielectric section is parallel to the first direction.

4. The piezoelectric stack device according to claim 1, characterized in that: The piezoelectric stack device further includes a first lead, a second lead and a third lead; The first lead is electrically connected to the first electrode sheet and is used to transmit a first voltage to the first electrode sheet; The second lead is electrically connected to the second electrode sheet and is used to transmit a second voltage to the second electrode sheet; The third lead is electrically connected to the second electrode layer and is used to transmit a third voltage to the second electrode layer; Among them, V1>V2, V2=0V, V2≤V3≤V1, V1 represents the first voltage, V2 represents the second voltage, and V3 represents the third voltage.

5. The piezoelectric stack device according to claim 1, characterized in that: The through hole comprises an elliptical hole; Alternatively, the through hole includes an oblong hole, and the oblong hole includes a first through hole section, a second through hole section and a third through hole section; the first through hole section and the second through hole section are located on two opposite sides of the third through hole section; the first through hole section includes a semicircular hole, the second through hole section includes a semicircular hole, and the third through hole section includes a rectangular hole.

6. The piezoelectric stack device according to claim 1, characterized in that: The piezoelectric stack device also includes a first insulating layer and a second insulating layer; Along the first direction, the first insulating layer and the second insulating layer are located at two opposite ends of the piezoelectric stack device.

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