Small earthquake acceleration sensor

Abstract

The utility model discloses a small earthquake acceleration sensor comprising a first direction sensitive element, a second direction sensitive element and a third direction sensitive element which are connected with a common mass block together. And the displacement of the common mass block acts on the first direction sensitive element, the second direction sensitive element and the third direction sensitive element at the same time. According to the three-axis acceleration sensor, the common mass block is arranged to jointly act on the sensitive elements in the three directions, the acceleration in the three directions can be measured at the same time when the sensor is subjected to external force, acceleration measurement in the three-dimensional space direction is achieved, only one common mass block is needed, and therefore the three-axis acceleration sensor is compact in structure, small in size, light in weight and high in reliability. And the installation space can be saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to acceleration sensor technical field more specifically, it is a kind of small earthquake acceleration sensor. BACKGROUND

[0002] At present, acceleration vibration sensor used in earthquake monitoring is mostly single-axis design, can only measure vibration in single direction. To realize all-around monitoring, three single-axis sensors are needed to be installed to detect vibration in X, Y, Z three directions respectively, which not only increases equipment volume and space occupation, but also improves installation and maintenance difficulty and cost.

[0003] Although integrating three single-axis sensors into one device can reduce space occupation, electromagnetic interference between sensors after integration can cause background noise to increase, thereby reducing sensor sensitivity, making it difficult for sensor to detect weak seismic signals, and only strong signals can be responded, limiting its application effect in earthquake monitoring.

[0004] The above shortcomings need to be improved. UTILITY MODEL CONTENT

[0005] In order to solve or alleviate the problem of limited monitoring function and large size of acceleration sensor in the prior art, the utility model provides a small earthquake acceleration sensor.

[0006] The utility model technical scheme is as follows:

[0007] A small earthquake acceleration sensor, comprising a support seat, a connecting column is arranged on the support seat, a plurality of direction sensitive elements are coaxially sleeved and arranged between the support seat and the connecting column, a common mass block is connected together, and the common mass block is displaced and acts on each direction sensitive element.

[0008] Further, the direction sensitive element includes a first direction sensitive element, a second direction sensitive element and a third direction sensitive element, and the polarity directions of the first direction sensitive element, the second direction sensitive element and the third direction sensitive element are perpendicular to each other.

[0009] Further, the support seat and the connecting column are detachable, and the connecting column is used for grounding signal negative pole of the first direction sensitive element, the second direction sensitive element and the third direction sensitive element.

[0010] Further, the first direction sensitive element, the second direction sensitive element, the third direction sensitive element and the common mass block are annular, and the first direction sensitive element, the second direction sensitive element, the third direction sensitive element and the common mass block are coaxially sleeved on the connecting column, and the inner diameters of the first direction sensitive element, the second direction sensitive element, the third direction sensitive element and the common mass block are greater than the diameter of the connecting column.

[0011] Further, an insulating piece is arranged between the first direction sensitive element and the second direction sensitive element, and a supporting piece is arranged between the second direction sensitive element and the third direction sensitive element; the insulating piece and the supporting piece are annular, and the inner diameters of the insulating piece and the supporting piece are greater than the diameter of the connecting column.

[0012] Further, the first direction sensitive element, the insulating piece, the second direction sensitive element and the supporting piece are sequentially sleeved on the outer side of the connecting column from bottom to top; a limiting part is arranged at the top of the connecting column, and the limiting part is used for pressing the first direction sensitive element, the insulating piece, the second direction sensitive element and the supporting piece on the supporting seat; the third direction sensitive element is sleeved on the outer side of the supporting piece, and the third direction sensitive element and the supporting piece are in interference fit; the common mass block is sleeved on the outer side of the third direction sensitive element, and the common mass block and the third direction sensitive element are bonded.

[0013] Further, the outer side of the supporting piece is a stepped shaft, and the outer diameters of the stepped shaft decrease from top to bottom; the third direction sensitive element is sleeved on the upper stepped shaft, and a gap is arranged between the lower end surface of the third direction sensitive element and the upper end surface of the lower stepped shaft; the inner side of the common mass block is a stepped hole, and the hole diameters of the stepped hole increase from top to bottom; one of the stepped holes is in interference fit with the outer side of the third direction sensitive element, the lower end surface of the upper stepped hole abuts against the upper end surface of the third direction sensitive element, and gaps are arranged between the common mass block and the supporting seat, the connecting column, the first direction sensitive element, the insulating piece, the second direction sensitive element and the supporting piece.

[0014] Further, a circuit board is arranged on the common mass block, and the circuit board is electrically connected with the first direction sensitive element, the second direction sensitive element and the third direction sensitive element respectively.

[0015] Further, an outer shell is arranged on the outer side of the common mass block, and a gap is arranged between the outer shell and the common mass block; the outer shell is connected with the supporting seat; a limiting groove is arranged at the edge of the supporting seat, and the width of the limiting groove is equivalent to the thickness of the outer shell; a connecting terminal is arranged on the outer shell, and the connecting terminal is electrically connected with the circuit board.

[0016] Further, the bottom of the support seat is provided with a mounting seat, which is insulatedly connected with the support seat, and four corners of the mounting seat are provided with mounting holes.

[0017] Further, the mounting seat is provided with a mounting groove for placing the support seat, and the mounting groove is provided with a first positioning part, and the bottom of the support seat is provided with a second positioning part which is clamped with the first positioning part.

[0018] The three-axis acceleration sensor has the advantages that the common mass block is arranged to act on the three direction sensitive elements, the sensor can measure the acceleration in three directions simultaneously when the sensor is subjected to external force, the acceleration in three-dimensional space direction is measured, only one common mass block is needed, the three-axis acceleration sensor has compact structure, small volume and light weight, installation space can be saved, and the three-axis acceleration sensor has wide application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0020] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0021] Figure 2 is an exploded schematic diagram of the front structure of the present application;

[0022] Figure 3 is an exploded schematic diagram of the bottom structure of the present application

[0023] Figure 4 is a schematic diagram of the internal structure of the present application.

[0024] Wherein, the reference signs in the figure: 1, first direction sensitive element; 2, second direction sensitive element; 3, third direction sensitive element; 4, common mass block; 5, support seat; 501, limiting groove; 502, second positioning part; 6, connecting column; 601, limiting part; 7, insulating piece; 8, support piece; 9, circuit board; 10, shell; 1001, connecting terminal; 11, mounting seat; 1101, mounting hole; 1102, mounting groove; 1103, first positioning part. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical schemes and beneficial effects to be solved by the utility model more clearly understood, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and not to limit the utility model.

[0026] It should be noted that when a component is referred to as "fixed" or "provided" or "connected" to another component, it can be directly or indirectly located on the other component. The terms "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or position based on the orientation or position shown in the drawings, and are only for convenience of description, and cannot be understood as a limitation on the technical solutions. The terms "first", "second", etc. are only for the purpose of convenience, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "multiple" is two or more, unless otherwise specifically limited. The meaning of "several" is one or more, unless otherwise specifically limited.

[0027] As Figures 1 to 4 shown, the utility model discloses a small earthquake acceleration sensor in one embodiment, including first direction sensitive element 1, second direction sensitive element 2 and third direction sensitive element 3, first direction sensitive element 1, second direction sensitive element 2 and third direction sensitive element 3 are connected to a common mass block 4 in common, and the common mass block 4 displacement acts on first direction sensitive element 1, second direction sensitive element 2 and third direction sensitive element 3 simultaneously.

[0028] It should be noted that the connection of first direction sensitive element 1, second direction sensitive element 2 and third direction sensitive element 3 and common mass block 4 can be direct contact or indirect contact.

[0029] When the sensor is subjected to external force, acceleration is generated, causing the common mass 4 to displace. Since the common mass 4 is connected to the three-direction sensitive elements, the displacement will simultaneously act on the three-direction sensitive elements. The sensitive elements are shear crystals, specifically piezoelectric ceramics or quartz crystals. By using the piezoelectric effect, when the acceleration sensor is subjected to vibration, the force of the common mass 4 acting on the sensitive elements also changes. The sensitive elements deform under force in the corresponding direction, and polarization occurs inside, while opposite charges are generated on its two surfaces. When the external force is removed, it returns to the uncharged state. By monitoring the change in the electric signal, the acceleration in the X-axis, Y-axis and Z-axis directions can be measured.

[0030] In this embodiment, by setting the common mass 4 to act on the three-direction sensitive elements, the sensor can simultaneously measure the acceleration in three directions when subjected to external force, achieving three-dimensional spatial direction acceleration measurement. Only one common mass 4 is needed, making the three-axis acceleration sensor compact in structure, small in size, light in weight, saving installation space, and having a broad application prospect. In addition, multiple sensors are not needed to measure the spatial direction acceleration, and the length of the signal lines connected to each sensitive element can be shortened, thereby reducing the background noise, improving the resolution and sensitivity of the sensor, and enabling the sensor to effectively monitor weaker seismic signals, improving the accuracy and reliability of seismic monitoring.

[0031] As shown in FIG. 1, Figures 2 to 4 In a preferred embodiment, the compact three-axis acceleration sensor described above further comprises a support seat 5, the support seat 5 is provided with a connecting column 6, the first-direction sensitive element 1, the second-direction sensitive element 2, the third-direction sensitive element 3 and the common mass 4 are all annular, and the first-direction sensitive element 1, the second-direction sensitive element 2, the third-direction sensitive element 3 and the common mass 4 are coaxially sleeved and installed on the connecting column 6.

[0032] In this embodiment, by setting the connecting column 6 on the support seat 5, the X-axis, Y-axis and Z-axis three-direction sensitive elements and the common mass 4 are coaxially installed together, which can further save space and improve the structural stability of the sensor, preventing relative movement or misplacement of the components due to loose connection, thereby further improving the measurement accuracy and sensitivity of the sensor.

[0033] As shown in FIG. 1, Figures 2 to 4 In a preferred embodiment, the connecting column 6 is detachably connected with the support seat 5. Specifically, the connecting column 6 is a bolt, the support seat 5 is provided with a boss, and the connecting column 6 is threadedly connected with the boss.

[0034] In the embodiment, the connecting column 6 is detachably connected, facilitating installation and disassembly, thereby facilitating production and maintenance. In addition, the threaded connection allows the common mass 4 to sway within a certain range, and slight vibration can act on the common mass 4 to move, thereby being able to more sensitively respond to changes in external acceleration, thereby significantly improving the sensitivity of the sensor. In addition, the connecting column 6 connects the first direction sensitive element 1, the second direction sensitive element 2, and the third direction sensitive element 3 to the support seat 5, wherein the first direction sensitive element 1 is in direct electrical contact with the support seat 5, and the second direction sensitive element 2 and the third direction sensitive element 3 are in electrical contact with the support seat 5 through the connecting column 6, thereby connecting the signal negative poles of the first direction sensitive element 1, the second direction sensitive element 2, and the third direction sensitive element 3 to the signal ground, further reducing the volume, reducing the space occupation, and shortening the signal line length, thereby reducing the background noise.

[0035] In a preferred embodiment, the inner diameters of the first direction sensitive element 1, the second direction sensitive element 2, the third direction sensitive element 3, and the common mass 4 are all greater than the diameter of the connecting column 6.

[0036] In the embodiment, since the inner diameters of the X-axis, the Y-axis, the third direction sensitive element 3, and the common mass 4 are all greater than the diameter of the connecting column 6, unnecessary contact between the non-working surface of the sensitive element and other structures is effectively avoided, interference and error sources are reduced, sufficient deformation space is provided for the sensitive element, the sensitive element can freely respond to external stimuli without obstruction, and the measurement accuracy is ensured.

[0037] As shown in FIG. 1, Figures 2 to 4 In a preferred embodiment, an insulating member 7 is arranged between the first direction sensitive element 1 and the second direction sensitive element 2, and a support member 8 is arranged between the second direction sensitive element 2 and the third direction sensitive element 3, the insulating member 7 and the support member 8 are annular, and the inner diameters of the insulating member 7 and the support member 8 are greater than the diameter of the connecting column 6.

[0038] In the embodiment, the insulating member 7 is arranged between the first direction sensitive element 1 and the second direction sensitive element 2 to achieve electrical isolation between the first direction sensitive element 1 and the second direction sensitive element 2, prevent mutual interference between the first direction sensitive element 1 and the second direction sensitive element 2, avoid measurement errors caused by electrical crosstalk, thereby improving the measurement accuracy and stability of the sensor. In addition, the second direction sensitive element 2 and the third direction sensitive element 3 are in contact with the support member 8, and the support member 8 is in contact with the connecting column 6, thereby allowing the second direction sensitive element 2 and the third direction sensitive element 3 to be connected to the signal ground. In addition, the insulating member 7 and the support member 8 are annular, and the inner diameters thereof are greater than the diameter of the connecting column 6, thereby ensuring sufficient space for the sensitive elements to deform freely.

[0039] As shown in FIG. 1, Figure 4As shown, in a preferred embodiment, the first direction sensitive element 1, the insulating piece 7, the second direction sensitive element 2, and the support piece 8 are sequentially sleeved outside the connecting column 6 from bottom to top, the top of the connecting column 6 is provided with a limiting part 601, the limiting part 601 is used for pressing the first direction sensitive element 1, the insulating piece 7, the second direction sensitive element 2, and the support piece 8 on the support base 5, the third direction sensitive element 3 is sleeved outside the support piece 8, the third direction sensitive element 3 and the support piece 8 are in interference fit, and the common mass block 4 is sleeved outside the third direction sensitive element 3, and the common mass block 4 and the third direction sensitive element 3 are bonded.

[0040] In the embodiment, the limiting part 601 (the head of the bolt) at the top of the connecting column 6 is used for pressing each component on the boss of the support base 5, so that the stability of the structure is ensured. Meanwhile, the support piece 8 and the third direction sensitive element 3 are connected in interference fit, the third direction sensitive element 3 is bonded with the common mass block 4, the close assembly improves the connection strength between components, prevents errors caused by loose connection, and improves the stability and measurement accuracy of the sensor.

[0041] As shown in the figure, Figure 4 In a preferred embodiment, the outer side of the support piece 8 is a stepped shaft, the outer diameter decreases from top to bottom, the third direction sensitive element 3 is sleeved on the upper stepped shaft, a gap is arranged between the lower end surface of the third direction sensitive element 3 and the upper end surface of the lower stepped shaft, the inner side of the common mass block 4 is a stepped hole, the hole diameter increases from top to bottom, one of the stepped holes is in interference fit with the outer side of the third direction sensitive element 3, the lower end surface of the upper stepped hole abuts against the upper end surface of the third direction sensitive element 3, and gaps are arranged between the common mass block 4 and the support base 5, the connecting column 6, the first direction sensitive element 1, the insulating piece 7, the second direction sensitive element 2, and the support piece 8.

[0042] In the embodiment, by setting the outer side of the support piece 8 as a stepped shaft, the part with smaller outer diameter of the support piece 8 is used for connecting the third direction sensitive element 3, and the part with larger outer diameter can prevent the third direction sensitive element 3 from being separated from the support piece 8. The gap between the third direction sensitive element 3 and the support piece 8 effectively avoids the direct contact between the non-working surface of the third direction sensitive element 3 and other components, reduces interference, and ensures the sensitivity of the sensor.

[0043] The step between the stepped holes in the inner wall of the common mass 4 can be used for limiting, preventing the common mass 4 from falling and separating from the third direction sensitive element 3. In addition, the common mass 4 is not in contact with other components except the third direction sensitive element 3, reducing the restraint on the common mass 4. On the one hand, the common mass 4 has sufficient space in each direction, so that it can act on each direction sensitive element, ensuring the sensitivity of the sensor. On the other hand, the gap between the common mass 4 and other components can be used for wiring, further making full use of the space, making the structure more compact. In addition, the middle part of the common mass 4 is connected with the third direction sensitive element 3, so that part of it is above the connection and part of it is below the connection, making full use of the space. In a limited space, a larger common mass 4 is arranged, so that the mass of the common mass 4 is larger and the inertia is larger, making the sensor more sensitive.

[0044] As shown in Figure 4 In a preferred embodiment, the common mass 4 is provided with a circuit board 9, the circuit board 9 is adhesively connected with the common mass 4, and the circuit board 9 is electrically connected with the first direction sensitive element 1, the second direction sensitive element 2 and the third direction sensitive element 3 respectively. The support seat 5 is connected to the circuit board 9 through a line, so as to connect the negative electrode of the first direction sensitive element 1, the second direction sensitive element 2 and the third direction sensitive element 3 to the circuit board 9. The positive electrode of the first direction sensitive element 1, the second direction sensitive element 2 and the third direction sensitive element 3 is respectively provided with an electrode sheet, and each electrode sheet is connected to the circuit board 9 through a line, so as to connect the positive electrode of the first direction sensitive element 1, the second direction sensitive element 2 and the third direction sensitive element 3 to the circuit board 9. It should be noted that the outer side of the connecting line is provided with an insulating layer.

[0045] The outer side of the common mass 4 is covered with a shell 10, and a gap is provided between the shell 10 and the common mass 4. The shell 10 is connected with the support seat 5, and the edge of the support seat 5 is provided with a limiting groove 501, the width of the limiting groove 501 is equivalent to the thickness of the shell 10. The shell 10 is provided with a connecting terminal 1001, and the connecting terminal 1001 is electrically connected with the circuit board 9.

[0046] In the embodiment, the shell 10 is arranged to protect the components such as the common mass 4 and the direction-sensitive element inside the shell 10 from external interference, and the gap between the shell 10 and the common mass 4 avoids the motion interference on the common mass 4, thereby ensuring the sensitivity of the sensor. In addition, the limiting groove 501 is arranged to tightly connect the shell 10 and the support base 5, and the shell 10 can be stably installed through the adhesive sealing, and the compactness of the structure is realized. In addition, the connecting terminal 1001 arranged on the shell 10 is electrically connected with the X, Y and Z three-axis direction-sensitive elements through the circuit board 9, thereby providing a reliable channel for the transmission of the sensor signal, and ensuring the accurate collection and transmission of the sensor data.

[0047] As shown in Figures 1 to 4 In a preferred embodiment, the bottom of the support base 5 is provided with a mounting seat 11, the mounting seat 11 is insulatively connected with the support base 5, and mounting holes 1101 are arranged at four corners of the mounting seat 11. Specifically, the support base 5 is connected with the mounting seat 11 through the insulating tape, and the insulating sand can be doped at the connection.

[0048] The mounting seat 11 is provided with a mounting groove 1102 for placing the support base 5, the first positioning part 1103 is arranged in the mounting groove 1102, and the second positioning part 502 is arranged at the bottom of the support base 5 and is clamped with the first positioning part 1103.

[0049] In the embodiment, the support base 5 is insulatively connected with the mounting seat 11, the electrical isolation is realized, the internal circuit of the sensor is protected from the external environment, and the mounting holes 1101 arranged at four corners facilitate the fixation and installation of the entire sensor module. In addition, the first positioning part 1103 arranged in the mounting groove 1102 is clamped with the second positioning part 502 at the bottom of the support base 5, so that the support base 5 is accurately positioned in the mounting groove 1102, the sensor is prevented from being deviated or misaligned during assembly, the assembly is facilitated, and the stability and reliability of the structure are improved. In addition, the first positioning part 1103 and the second positioning part 502 can orient the first direction-sensitive element 1 and the second direction-sensitive element 2, so that the polarity direction of the first direction-sensitive element 1 and the second direction-sensitive element 2 is ensured to be at the preset position, thereby ensuring the accuracy of the sensor detection.

[0050] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A small seismic acceleration sensor, characterized by, The support seat is detachable from the connecting column, the direction-sensitive elements include a first direction-sensitive element, a second direction-sensitive element and a third direction-sensitive element, polar directions of the first direction-sensitive element, the second direction-sensitive element and the third direction-sensitive element are perpendicular to each other, and the connecting column is used for grounding negative poles of signals of the first direction-sensitive element, the second direction-sensitive element and the third direction-sensitive element.

2. A small seismic acceleration sensor according to claim 1, characterized in that The first direction-sensitive element, the second direction-sensitive element, the third direction-sensitive element and the common mass block are all annular, and inner diameters of the first direction-sensitive element, the second direction-sensitive element, the third direction-sensitive element and the common mass block are all greater than a diameter of the connecting column.

3. A small seismic acceleration sensor according to claim 2, characterized in that An insulating piece is arranged between the first direction-sensitive element and the second direction-sensitive element, and a support piece is arranged between the second direction-sensitive element and the third direction-sensitive element.

4. The small seismic acceleration sensor according to claim 2, wherein The insulating piece and the support piece are both annular, and inner diameters of the insulating piece and the support piece are both greater than the diameter of the connecting column. The first direction-sensitive element, the insulating piece, the second direction-sensitive element and the support piece are sequentially arranged outside the connecting column from bottom to top.

5. A small seismic acceleration sensor according to claim 4, characterized in that A limiting portion is arranged at a top of the connecting column, and the limiting portion is used for pressing the first direction-sensitive element, the insulating piece, the second direction-sensitive element and the support piece on the support seat. The third direction-sensitive element is arranged outside the support piece, and the third direction-sensitive element and the support piece are in interference fit. The common mass block is arranged outside the third direction-sensitive element, and the common mass block and the third direction-sensitive element are bonded. An outer side of the support piece is a stepped shaft, an outer diameter of the stepped shaft decreases from top to bottom, the third direction-sensitive element is arranged on an upper stepped shaft, and a gap is arranged between a lower end surface of the third direction-sensitive element and an upper end surface of a lower stepped shaft.

6. A small seismic acceleration sensor according to claim 5, characterized in that An inner side of the common mass block is a stepped hole, a hole diameter of the stepped hole increases from top to bottom, a middle stepped hole is in interference fit with an outer side of the third direction-sensitive element, a lower end surface of an upper stepped hole abuts against an upper end surface of the third direction-sensitive element, and gaps are arranged between the common mass block and the support seat, the connecting column, the first direction-sensitive element, the insulating piece, the second direction-sensitive element and the support piece. A circuit board is arranged on the common mass block, and the circuit board is electrically connected with the first direction-sensitive element, the second direction-sensitive element and the third direction-sensitive element respectively.

7. A small seismic acceleration sensor according to any one of claims 2-6, characterized in that An outer shell is arranged on an outer side of the common mass block, a gap is arranged between the outer shell and the common mass block, and the outer shell is connected with the support seat.

8. A small seismic acceleration sensor according to claim 7, characterized in that A limiting groove is arranged at an edge of the support seat, and a width of the limiting groove is equivalent to a thickness of the outer shell. ​ The housing is provided with a connecting terminal electrically connected with the circuit board.

9. A small seismic acceleration sensor according to any one of claims 2-6, characterized in that The bottom of the support base is provided with a mounting seat which is insulatedly connected with the support base, and four corners of the mounting seat are provided with mounting holes.

10. The small seismic acceleration sensor according to claim 9, wherein The mounting seat is provided with a mounting groove for placing the support base, the mounting groove is provided with a first positioning part, and the bottom of the support base is provided with a second positioning part which is clamped with the first positioning part.

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