CN210199140U

CN210199140U - Piezoelectric sensor

Info

Publication number: CN210199140U
Application number: CN201920823563.9U
Authority: CN
Inventors: Yongzhong Nie; 聂泳忠; Chuan Nie; 聂川
Original assignee: Xirenma (xiamen) Technology Co Ltd
Current assignee: XIRENMA COMBINED MEASUREMENT AND CONTROL (QUANZHOU) TECHNOLOGY Co.,Ltd.
Priority date: 2019-06-03
Filing date: 2019-06-03
Publication date: 2020-03-27
Anticipated expiration: 2029-06-03

Abstract

An embodiment of the utility model provides a piezoelectric sensor, include: the piezoelectric crystal cylinder, the piezoelectric crystal cylinder is including a plurality of crystal layers of range upon range of setting, the crystal layer has two terminal surfaces that the axial is relative, two terminal surfaces all include electrode membrane district and terminal membrane district, expose the district through the crystal between the electrode membrane district of same terminal surface and the terminal membrane district and separate, the electrode membrane district of two terminal surfaces is connected with the terminal membrane district electricity of relative terminal surface respectively in every crystal layer, correspond the contact and form the electricity between the terminal membrane district on the adjacent terminal surface of adjacent crystal layer and between the electrode membrane district. The embodiment of the utility model provides a piezoelectric sensor structure rigidity is high, and it is little to pile up the size, and compact structure, wholeness are good.

Description

Piezoelectric sensor

Technical Field

The utility model relates to a sensor technical field especially relates to a piezoelectric sensor.

Background

The signal output by the piezoelectric acceleration sensor is in direct proportion to the vibration acceleration borne by the system, and the piezoelectric acceleration sensor with high performance index requirement, such as a standard piezoelectric acceleration sensor used for calibrating the acceleration sensor, is required to have better linearity, annual stability and higher resonant frequency.

When the piezoelectric acceleration sensor is used, the frequency response characteristic is low, the integral contact rigidity is insufficient, and the stability needs to be improved.

Therefore, a new piezoelectric sensor is needed.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a piezoelectric sensor aims at realizing that structural rigidity is high, and it is little to pile up the size, compact structure.

An aspect of the embodiment of the present invention provides a piezoelectric sensor, include:

the piezoelectric crystal cylinder, the piezoelectric crystal cylinder is including a plurality of crystal layers of range upon range of setting, the crystal layer has two terminal surfaces that the axial is relative, two terminal surfaces all include electrode membrane district and terminal membrane district, expose the district through the crystal between the electrode membrane district of same terminal surface and the terminal membrane district and separate, the electrode membrane district of two terminal surfaces is connected with the terminal membrane district electricity of relative terminal surface respectively in every crystal layer, correspond the contact and form the electricity between the terminal membrane district on the adjacent terminal surface of adjacent crystal layer and between the electrode membrane district.

According to an aspect of the embodiment of the present invention, the electrode film region of the end face in each crystal layer is electrically connected to the terminal film region of the opposite end face through the side electrode film layer.

According to an aspect of the embodiments of the present invention, the area occupied by the electrode film area in each end surface is larger than the area occupied by the terminal film area.

According to an aspect of the embodiments of the present invention, the electrode film regions of the two end faces of each crystal layer are opposite in polarity.

According to the utility model discloses an aspect still includes casing, adapting unit and quality piece, and the casing has the locating hole, and in the casing was arranged in to piezoelectric crystal cylinder and quality piece, adapting unit passed the locating hole and compressed tightly piezoelectric crystal cylinder and quality piece to the casing along the axial direction of piezoelectric crystal cylinder.

According to the utility model discloses an aspect, adapting unit includes first connecting piece and second connecting piece, and piezoelectric crystal cylinder and quality piece have central through-hole, and first connecting piece passes locating hole and central through-hole and second connecting piece fastening connection.

According to the utility model discloses an aspect, the casing has the mounting hole, and the mounting hole is coaxial with the piezoelectric crystal cylinder to be located the one end of keeping away from the locating hole of casing.

According to the utility model discloses an aspect, the casing includes a plurality of casing portions, and locating hole and mounting hole are located the different casing portions of casing respectively.

According to the utility model discloses an aspect still includes the connector subassembly, is provided with the connector through-hole on the casing, and the casing is installed through the connector through-hole to the connector subassembly to insulating setting between connector subassembly and the casing.

According to an aspect of the embodiments of the present invention, a connector assembly includes:

the connector shell is insulated from the shell;

the contact pin is insulated from the connector shell and is electrically connected to the piezoelectric crystal cylinder.

The utility model provides a piezoelectric sensor, range upon range of setting between a plurality of crystal layers in the piezoelectric crystal cylinder to realize the electricity between the crystal layer and connect and do not set up the electrode layer alone through setting up electrode membrane district and terminal membrane district on the crystal layer, thereby improve the structural rigidity of piezoelectric crystal cylinder, reduced the pile up size, compact structure, the wholeness is good.

Drawings

Non-limiting embodiments will now be described in more detail with reference to the accompanying drawings, in which like or similar reference numerals refer to like or similar features.

Fig. 1 is a schematic structural diagram of a piezoelectric crystal cylinder of a piezoelectric sensor according to an embodiment of the present invention;

fig. 2 is a plan view of a crystal layer of the piezoelectric sensor according to the embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of the crystal layer of FIG. 2;

fig. 4 is a schematic structural diagram of a piezoelectric crystal cylinder of a piezoelectric sensor according to an embodiment of the present invention, in which a first side electrode and a second side electrode are shown;

fig. 5 is a partial structural cross-sectional view of an example of a piezoelectric crystal cylinder of a piezoelectric sensor according to an embodiment of the present invention;

fig. 6 is a partial structural cross-sectional view of another example of a piezoelectric crystal cylinder of a piezoelectric sensor according to an embodiment of the present invention;

fig. 7 is a sectional view of a piezoelectric sensor according to an embodiment of the present invention.

Description of reference numerals: 1. a piezoelectric crystal cylinder; 11. a crystalline layer; 111. an electrode membrane region; 112. a terminal film region; 113. a side electrode film layer; 12. a first side electrode; 13. a second side electrode; 2. a housing; 3. a connecting member; 31. a first connecting member; 32. a second connecting member; 4. a mass block; 5. an insulating member; 6. sealing gaskets; 7. a connector assembly; 71. a connector housing; 72. and (6) inserting pins.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, 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 invention by illustrating examples of the invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the features are not shown to scale for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The directional terms appearing in the following description are directions shown in the drawings and do not limit the specific structure of the embodiments of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as either a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as the case may be, by those of ordinary skill in the art.

For a better understanding of the present invention, a piezoelectric sensor according to an embodiment of the present invention is described in detail below with reference to fig. 1 to 7.

Fig. 1 is a schematic structural diagram of a piezoelectric crystal cylinder of a piezoelectric sensor according to an embodiment of the present invention. Fig. 2 is a plan view of a crystal layer of the piezoelectric sensor according to the embodiment of the present invention. Fig. 3 is a cross-sectional view of the crystal layer of fig. 2 taken along line a-a. Referring to fig. 1 to 3 together, according to the utility model discloses a piezoelectric sensor includes piezoelectric crystal cylinder 1, piezoelectric crystal cylinder 1 is including a plurality of crystal layers 11 of range upon range of setting, crystal layer 11 has two terminal surfaces that the axial is relative, two terminal surfaces all include electrode membrane area 111 and terminal membrane area 112, expose the district through the crystal between electrode membrane area 111 and the terminal membrane area 112 of same terminal surface and separate, the electrode membrane area 111 of two terminal surfaces is connected with the terminal membrane area 112 electricity of relative terminal surface respectively in every crystal layer 11, correspond the contact and form the electricity and connect between the terminal membrane area 112 on the adjacent terminal surface of adjacent crystal layer 11 and between the electrode membrane area 111.

According to the utility model discloses an embodiment, piezoelectric crystal cylinder 1 has the axial relative first end and second end, and a plurality of crystal layers 11 set up along piezoelectric crystal cylinder 1's axial range upon range of. The crystal layer 11 is a crystal slab of uniform thickness and may have any suitable cross-sectional shape including, but not limited to, circular, rectangular, oval, and the like. The bulk rigidity of the piezoelectric crystal cylinder 1 that the even crystal layer 11 of thickness was stacked up is higher, makes according to the utility model discloses piezoelectric sensor's stability is better. An intersecting edge is formed between the end face of the crystal layer 11 and the outer peripheral surface thereof. Crystal layer 11 may be composed of any suitable piezoelectric material, including but not limited to quartz single crystal, PZT (lead zirconate titanate), bismuth layered ceramic, lithium niobate, and the like. In one embodiment, the crystal layer 11 is a single crystal wafer of quartz.

According to an embodiment of the present invention, both end faces of each crystal layer 11 are applied with a patterned electrode film region 111 and a terminal film region 112. The electrode film region 111 and the terminal film region 112 of each end surface are separated by a crystal exposure region so that the electrode film region 111 and the terminal film region 112 of each end surface are not in communication. In a specific embodiment, the electrode film region 111 and the terminal film region 112 are metal-plated layers having an extremely thin thickness, and the metal layers are set to an extremely thin thickness so as to further reduce the thickness of the stacked crystal layers 11 while providing electrical conduction, and to improve the contact rigidity between the crystal layers 11, thereby further improving the rigidity of the piezoelectric crystal cylinder 1.

According to the utility model discloses an embodiment, the shared area of electrode membrane area 111 is greater than the shared area of terminal membrane area 112 in every terminal surface. In one embodiment, in each end face of each crystal layer 11, the electrode film region 111, the terminal film region 112, and the crystal-exposed region therebetween occupy the entire surface area of the end face. The electrode film region 111 and the terminal film region 112 have intersecting regions, such as points, lines, or line segments, respectively, with the edges of the end faces on which they are located. In other words, the electrode film region 111 and the terminal film region 112 of the crystal layer 11 are partially exposed to the outer peripheral surface of the crystal layer 11, respectively.

According to the embodiment of the present invention, each crystal layer 11 has the side electrode film layer 113 on the outer peripheral surface thereof, and the electrode film region 111 of the end face in each crystal layer 11 is electrically connected to the terminal film region 112 of the opposite end face through the side electrode film layer 113. The number of the side electrode film layers 113 is two or more per crystal layer 11. In a specific embodiment, each crystal layer 11 has two side electrode film layers 113 disposed at intervals on an outer peripheral surface thereof. The side electrode film layer 113 has two electrical connection terminals, one electrical connection terminal being electrically connected to the electrode film region 111 of one end face of the crystal layer 11 where it is located, and the other electrical connection terminal being electrically connected to the terminal film region 112 of the other end face of the crystal layer 11 where it is located. That is, electrical connection is made between the electrode film region 111 and the terminal film region 112 of each crystal layer 11 belonging to different end faces through the side electrode film layer 113.

According to the embodiment of the present invention, the polarity of the electrode film regions 111 of both end faces of each crystal layer 11 is opposite.

According to the embodiment of the present invention, the patterned films on the adjacent end surfaces of the adjacent crystal layers 11 correspond to each other, i.e., the corresponding contact and the electrical connection are formed between the terminal film regions 112, and the corresponding contact and the electrical connection are formed between the electrode film regions 111. And in the adjacent crystal layers 11, the pair of terminal film regions 112 of the corresponding contact are separated from the pair of electrode film regions 111 of the corresponding contact by the crystal exposure section.

According to the utility model discloses a piezoelectric sensor, range upon range of setting between a plurality of crystal layers 11 in the piezoelectric crystal cylinder 1 to realize the electricity between crystal layer 11 and connect and do not set up the electrode layer alone through setting up electrode membrane district 111 and terminal membrane district 112 on crystal layer 1, thereby improve piezoelectric crystal cylinder 1's structural rigidity, reduced and piled up the size, compact structure, the wholeness is good.

Fig. 4 is a schematic structural diagram of a piezoelectric crystal cylinder of a piezoelectric sensor according to an embodiment of the present invention, in which a first side electrode and a second side electrode are shown. As shown in fig. 4, according to the embodiment of the present invention, the first side electrode 12 and the second side electrode 13 formed by the side electrode film layer 113 are formed on the outer peripheral surface of the piezoelectric crystal cylinder 1, and the first side electrode 12 and the second side electrode 13 extend from the first end to the second end respectively and are disposed at intervals on the outer peripheral surface of the piezoelectric crystal cylinder 1. A part of the electrode film region 111 in the piezoelectric crystal cylinder 1 is electrically connected to the first side electrode 12, and another part is electrically connected to the second side electrode 13. The electrode membrane region 111 electrically connected to the first side electrode 12 constitutes one plate of a parallel capacitor, and the electrode membrane region 111 electrically connected to the second side electrode 13 constitutes the other plate of the parallel capacitor. In one embodiment, the first side electrode 12 may serve as a positive electrode lead, and the second side electrode 13 may serve as a negative electrode lead. In another embodiment, the first side electrode 12 may serve as a negative electrode lead, and the second side electrode 13 may serve as a positive electrode lead.

Fig. 5 is a partial structural sectional view of an example of a piezoelectric crystal cylinder of a piezoelectric sensor according to an embodiment of the present invention. As shown in fig. 5, according to an embodiment of the present invention, the first side electrode 12 or the second side electrode 13 is provided in a disconnected manner on the outer peripheral surface of the piezoelectric crystal cylinder 1. That is, the plurality of side electrode film layers 113 constituting the first side electrode 12 (or the second side electrode 13) are not connected to each other, and are electrically connected to each other through the corresponding electrode film region 111 or the terminal film region 112. Such a disconnection arrangement can reduce stress concentration of the first side electrode 12 and the second side electrode 13 in the axial direction, and can avoid or cope with breakage of the first side electrode 12 and the second side electrode 13 in the axial direction to some extent, thereby improving stability and reliability of the sensor.

Fig. 6 is a partial structural sectional view of another example of a piezoelectric crystal cylinder of a piezoelectric sensor according to an embodiment of the present invention. As shown in fig. 6, according to another embodiment of the present invention, the first side electrode 12 or the second side electrode 13 is continuously provided on the outer peripheral surface of the piezoelectric crystal cylinder 1. That is, the plurality of side electrode film layers 113 constituting the first side electrode 12 (or the second side electrode 13) are connected in sequence, and are electrically connected to the corresponding electrode film regions 111 or the corresponding terminal film regions 112. This continuous arrangement makes it possible to more conveniently arrange the first side electrode 12 and the second side electrode 13 by integrally laying the first side electrode 12 and the second side electrode 13 on the outer peripheral surface of the piezoelectric crystal cylinder 1.

According to the embodiment of the present invention, the shape of the piezoelectric crystal cylinder 1 is a cylinder, and in another embodiment, the shape of the piezoelectric crystal cylinder 1 is a polygonal cylinder.

According to the embodiment of the present invention, the outer circumferential surface of the piezoelectric crystal cylinder 1 has a side electrode accommodating portion for accommodating the first side electrode 12 or the second side electrode 13. In one embodiment, the side electrode receptacles are two flush facets disposed on the outer circumferential surface of the piezoelectric crystal cylinder 1, extending from a first end to a second end in the axial direction and spaced apart from each other. Preferably, the two flush facets are opposite in the radial direction of the piezoelectric crystal cylinder 1. The first side electrode 12 and the second side electrode 13 are respectively laid on a flush section, that is, the first side electrode 12 corresponds to one flush section, and the second side electrode 13 corresponds to the other flush section. The side electrode receiving portions may also be arc-shaped cut surfaces or conform to the contour of the outer circumferential surface of the piezoelectric crystal cylinder 1. Providing the side electrode accommodating portion enables the first side electrode 12 and the second side electrode 13 to be laid more easily, and facilitates alignment between the crystal layers 11 when the crystal layers 11 are stacked to form the piezoelectric crystal cylinder 1.

Fig. 7 is a sectional view of a piezoelectric sensor according to an embodiment of the present invention. As shown in fig. 7, the piezoelectric sensor according to the present invention further includes a housing 2, a connection member 3, and a mass block 4, the housing 2 has a positioning hole, the piezoelectric crystal cylinder 1 and the mass block 4 are disposed in the housing 2, and the connection member 3 passes through the positioning hole and compresses tightly the piezoelectric crystal cylinder 1 to the housing 2 along the axial direction of the mass block 4. The piezoelectric crystal cylinder 1 is arranged between the mass block 4 and the shell 2, and the two axial ends of the piezoelectric crystal cylinder 1 are provided with insulating parts 5. That is, the insulating members 5 are provided between the piezoelectric crystal cylinder 1 and the case 2, and between the piezoelectric crystal cylinder 1 and the mass block 4, respectively. The insulating member 5 may be an insulating spacer.

According to the utility model discloses an embodiment, adapting unit 3 includes first connecting piece 31 and second connecting piece 32, and piezoelectric crystal cylinder 1 and quality piece 4 have central through-hole, and first connecting piece 31 passes locating hole and central through-hole and second connecting piece 32 fastening connection. The hole walls of the central through holes of the piezoelectric crystal cylinder 1 and the mass block 4 are in insulation arrangement or clearance fit with the first connecting piece 31. The first connector 31 may be a bolt and the second connector 32 may be a mating nut. The rod portion of the first connecting member 31 passes through the positioning hole, and the second connecting member 32 is engaged with the screw thread on the rod portion of the first connecting member 31. The first connector 31 has a shoulder portion having a radial dimension greater than the diameter of the positioning hole so that the first connector 31 is retained at the positioning hole. And the positioning hole can be also provided with an annular groove for accommodating the shoulder part. Optionally, the piezoelectric sensor provided in this embodiment may further include a sealing gasket 6, and the positioning hole of the housing 2 further includes a receiving portion capable of receiving the sealing gasket 6, specifically, an annular groove formed at the positioning hole of the housing 2.

According to the utility model discloses an embodiment, casing 2 has the mounting hole, and the mounting hole is coaxial with piezoelectric crystal cylinder 1 to be located casing 2's the one end of keeping away from the locating hole. That is, the mounting holes and the positioning holes are respectively formed near the opposite ends of the piezoelectric crystal cylinder 1, and the region of the housing 2 where the mounting holes are formed is far from the region of the housing 2 where the positioning holes are formed. Thus, as shown in FIG. 1, in the orientation shown in FIG. 1, the piezoelectric crystal cylinder 1 is flipped over with respect to the mounting holes. Thus, in the case where the piezoelectric sensor provided in the present embodiment is mounted on a device under test through the mounting hole, the influence of strain on the piezoelectric crystal cylinder 1 at the mounting hole can be reduced or eliminated.

According to the utility model discloses an embodiment, casing 2 includes a plurality of casing portions, and locating hole and mounting hole are located casing 2's different casing portions respectively. As shown in fig. 1, the housing 2 includes a first housing portion on which the positioning hole is provided and a second housing portion on which the mounting hole is provided. The first and second housing parts may be assembled to the housing 2. The first and second housing parts may be arranged in a detachable connection, for example a threaded connection. The part of the housing 2 where the positioning hole is located may be formed as a first base on which the positioning hole is located. The part of the housing 2 where the mounting hole is located may be formed as a second base on which the mounting hole is located. The first and second bases are thicker relative to the rest of the housing 2.

According to the utility model discloses a piezoelectric sensor still includes connector assembly 7, is provided with the connector through-hole on the casing 2, and casing 2 is installed through the connector through-hole to connector assembly 7 to it sets up to insulate between connector assembly 7 and the casing 2. A part of the connector assembly 7 passes through the connector through-hole into the inside of the housing 2, and another part is outside the housing 2. The connector through holes may be in the same part of the housing 2 as the mounting holes, i.e. both on the second housing part.

According to an embodiment of the present invention, the connector assembly 7 includes a connector housing 71 and a pin 72, and the connector housing 71 is insulated from the housing 2 and is electrically connected to one of the first side electrode 12 and the second side electrode 13. The pin 72 is provided with insulation from the connector housing 71 and is electrically connected to the other of the first side electrode 12 and the second side electrode 13. The connector assembly 7 may be a single core connector. The electrical connection between the connector assembly 7 and the first and

second side electrodes

12 and 13 may be through wires. The connector housing 71 and the housing 2 may be fixed by glass frit. The pins 72 and the connector housing 71 may be fixed by glass frit. The connector housing 71 and the housing 2 are arranged in an insulating mode, so that the housing 2 is isolated from signals, and the external interference resistance of the piezoelectric sensor provided by the embodiment is improved.

According to the piezoelectric sensor of the utility model, a plurality of crystal layers 11 in the piezoelectric crystal cylinder 1 are stacked, and the electric connection between the crystal layers 11 is realized through the electrode film region 111 and the terminal film region 112 arranged on the crystal layers 1 without independently arranging electrode layers, so that the structural rigidity of the piezoelectric crystal cylinder 1 is improved, the stacking size is reduced, the structure is compact, and the integrity is good; the mounting hole and the positioning hole are relatively far away from each other, so that the influence of strain of the piezoelectric crystal cylinder 1 at the mounting hole can be reduced or even eliminated under the condition that the piezoelectric sensor provided by the embodiment is mounted on a tested device through the mounting hole; the connector housing 71 and the housing 2 are arranged in an insulating mode, so that the housing 2 is isolated from signals, and the external interference resistance of the piezoelectric sensor provided by the embodiment is improved.

It should be understood that the description herein of specific embodiments of the invention is exemplary and should not be construed as an undue limitation on the scope of the invention. The scope of the invention is defined by the claims appended hereto, and encompasses all embodiments falling within its scope and obvious equivalents thereof.

Claims

1. A piezoelectric sensor, comprising:

the piezoelectric crystal cylinder (1), the piezoelectric crystal cylinder (1) includes a plurality of crystal layers (11) that are stacked, the crystal layer (11) has two end faces that are opposite in the axial direction, two the end faces all include electrode membrane area (111) and terminal membrane area (112), the same electrode membrane area (111) of end face and the terminal membrane area (112) are separated by the crystal exposure area, the electrode membrane area (111) of two the end faces in each crystal layer (11) is respectively electrically connected with the terminal membrane area (112) that is opposite to the end face, the terminal membrane area (112) on the adjacent end face of adjacent crystal layer (11) and the electrode membrane area (111) are correspondingly contacted and electrically connected.

2. The piezoelectric sensor according to claim 1, wherein each of the crystal layers (11) has a side electrode film layer (113) on an outer peripheral surface thereof, and the electrode film region (111) of the end face in each of the crystal layers (11) is electrically connected to the terminal film region (112) opposite to the end face through the side electrode film layer (113).

3. The piezoelectric sensor according to claim 2, wherein an area occupied by the electrode film region (111) in each of the end faces is larger than an area occupied by the terminal film region (112).

4. The piezoelectric sensor according to claim 1, wherein the electrode film regions (111) of the two end faces of each of the crystal layers (11) are opposite in polarity.

5. The piezoelectric sensor according to claim 1, further comprising a housing (2), a connecting member (3), and a mass (4), wherein the housing (2) has a positioning hole, the piezoelectric crystal cylinder (1) and the mass (4) are placed in the housing (2), and the connecting member (3) presses the piezoelectric crystal cylinder (1) and the mass (4) to the housing (2) through the positioning hole in an axial direction of the piezoelectric crystal cylinder (1).

6. The piezoelectric transducer according to claim 5, wherein the connecting member (3) comprises a first connecting member (31) and a second connecting member (32), the piezoelectric crystal cylinder (1) and the mass (4) have a central through hole, and the first connecting member (31) is fixedly connected with the second connecting member (32) through the positioning hole and the central through hole.

7. The piezoelectric sensor according to claim 5, wherein the housing (2) has a mounting hole coaxial with the piezoelectric crystal cylinder (1) and located at an end of the housing (2) remote from the positioning hole.

8. The piezoelectric sensor according to claim 7, wherein the housing (2) comprises a plurality of housing portions, and the positioning hole and the mounting hole are respectively located on different housing portions of the housing (2).

9. The piezoelectric sensor according to claim 5, further comprising a connector assembly (7), wherein a connector through hole is provided in the housing (2), the connector assembly (7) is mounted to the housing (2) through the connector through hole, and the connector assembly (7) is provided in an insulated manner from the housing (2).

10. The piezoelectric sensor according to claim 9, wherein the connector assembly (7) comprises:

a connector housing (71) insulated from the housing (2);

and the contact pin (72) is insulated from the connector shell (71) and is electrically connected to the piezoelectric crystal cylinder (1).