Isolated acceleration sensor

Abstract

The utility model relates to an isolation type acceleration sensor which comprises a sensor body, the lower end of the sensor body is provided with a threaded hole, the lower end of the sensor body is correspondingly provided with an installation base plane, an insulation screw is arranged between the sensor body and a conversion screw, and field installation is convenient. According to the scheme, the sensor body is installed on the conversion screw through the insulation screw and then installed on the measured object, electrical isolation of the sensor and the measured object is achieved, the anti-interference capability of the sensor body is improved, safe and tight installation is ensured through double connection of threads and glue, and the reliability of the sensor is improved. And the stability of the sensor body during data detection can be guaranteed.

Description

Technical Field

[0001] The utility model relates to an isolated acceleration sensor, in particular to an isolated acceleration sensor applied in the field of acceleration sensors. Background Art

[0002] The isolated shear built-in IC technology in the acceleration sensor is composed of an isolated shear piezoelectric acceleration sensor and a miniature IC amplifier. The isolated shear can use multiple piezoelectric crystal elements and passive compensation sheets to greatly expand the sensitivity and operating temperature range, but the installation method of this acceleration sensor cannot achieve electrical isolation.

[0003] In order to solve the electrical isolation of the acceleration sensor, the market can use a split insulation pad adhesive installation, which has a great impact on the high-frequency characteristics.

[0004] In addition, the above installation method requires on-site bonding, and additional glue needs to be applied to the installation base surface, which makes the installation method inconvenient. Utility Model Content

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is the electrical isolation problem of the acceleration sensor.

[0006] In order to solve the above problems, the utility model provides an isolated acceleration sensor, including a sensor body, a threaded hole is opened at the lower end of the sensor body, a mounting base surface is correspondingly arranged at the lower end of the sensor body, an insulating screw is arranged between the sensor body and the conversion screw, the threaded hole of the sensor body is connected to the insulating screw external thread of the insulating screw, the insulating screw internal thread of the insulating screw is connected to the conversion screw external thread of the conversion screw, a glue storage groove is arranged between the threaded hole of the sensor body and the conversion screw upper surface of the conversion screw and the insulating screw internal thread of the insulating screw, and a glue blocking layer is arranged between the mounting base surface of the sensor body, the conversion screw connecting surface of the mounting screw and the insulating screw external thread of the insulating screw.

[0007] In the above-mentioned isolated acceleration sensor, this solution realizes electrical isolation between the sensor body and the object to be measured by mounting the sensor body on the conversion screw through the insulating screw.

[0008] As a further improvement of the present application, the threaded hole at the lower end of the sensor body is connected to an insulating screw, and the insulating screw is connected to a conversion screw.

[0009] As a further improvement of the present application, the insulating screw is threadedly connected to the conversion screw.

[0010] As a further improvement of the present application, the inner end of the glue storage tank is filled with glue liquid, and the glue liquid is in contact with the bottom of the sensor body hole and the upper base surface of the insulating screw.

[0011] As a further improvement of the present application, the glue is in contact with the bottom of the hole of the sensor body, the conversion screw connecting surface of the conversion screw, and the external thread of the insulating screw.

[0012] As a further improvement of the present application, an output line is fixedly connected to the right end of the sensor body, and an outer sheath is provided between the output line and the sensor body.

[0013] In summary, this solution installs the sensor body on the conversion screw through an insulating screw, and then installs it on the object to be measured, thereby achieving electrical isolation between the sensor and the object to be measured and improving the anti-interference ability of the sensor body. The double connection of thread and adhesive ensures a safe and tight installation, which is beneficial to ensuring the stability of the sensor body when detecting data. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a side view of the isolated acceleration sensor in this application;

[0015] Figure 2 It is a side view of the sensor body in this application;

[0016] Figure 3 It is a side view of the insulating screw in this application;

[0017] Figure 4 This is a side view of the conversion screw in this application.

[0018] Description of the numbers in the figure:

[0019] 1. Sensor body; 2. Output line; 3. Outer sheath; 4. Glue; 5. Insulating screw; 6. Glue plugging layer; 13. Glue storage tank; 7. Conversion screw; 11. Threaded hole; 12. Mounting base; 51. Insulating screw internal thread; 52. Insulating screw upper base; 53. Insulating screw external thread; 54. Insulating screw lower base; 71. Conversion screw upper surface; 72. Conversion screw external thread; 73. Conversion screw connection surface; 74. Conversion screw base; 75. Conversion screw internal thread. DETAILED DESCRIPTION

[0020] The application is described in detail below with reference to the accompanying drawings.

[0021] Figure 1The overall structure of the isolated acceleration sensor is shown, which includes a sensor body 1. The sensor body 1 can effectively prevent interference from the ground loop, has low impedance output, is anti-interference, has low noise, is cost-effective, is easy to install, and is particularly suitable for multi-point measurement. In addition, it has the advantages of a sturdy structure and is suitable for large vibration and impact measurement. With the use of low-noise cables and the integration of the cables on the sensor base, the disadvantages of poor connection caused by large acceleration signals are avoided. The cable output adopts the US military standard MIL-C-5015 plug, which is reliable and more suitable for industrial sites. A threaded hole 11 is opened at the lower end of the sensor body 1, and an insulating screw (5) is connected between the threaded hole 11 and the external thread (72) of the conversion screw (7). The right end of the sensor body 1 is fixedly connected with an output line 2, and an outer sheath 3 is provided between the output line 2 and the sensor body 1.

[0022] Figure 2 The sensor body (1) is shown to be composed of an isolated shear piezoelectric acceleration sensor and a micro IC amplifier to form an isolated shear structure. It uses multiple piezoelectric crystal elements and passive compensation sheets, which greatly expands the sensitivity and operating temperature range. It can also use piezoelectric materials in a wider range to ensure the best temperature performance and the best stability. At the same time, it can have a high signal-to-noise ratio in various working environments (such as large base strain, strong noise, large lateral vibration, large transient temperature and strong electromagnetic interference). The micro IC amplifier is basically composed of a MOS field effect tube, and is composed of a high-resistance resistor at the input end and a sensor. The capacitor forms a first-order high-pass filter, thereby determining the low-frequency cutoff frequency in the sensor measurement. The micro IC amplifier has the advantages of high integration, small size, high upper frequency limit (greater than 100kHz), low noise (less than 1uV equivalent to the input noise), wide operating temperature range, long-term stability and reliability, etc. The signal output of the built-in IC sensor has a two-wire connection feature, that is, the signal output line and the constant current source input line for the micro IC amplifier are the same line, and the other line is the ground line. The signal output line can use a low-noise coaxial cable with good shielding effect, and in the case of not very harsh environment, ordinary coaxial cable can also be used.

[0023] Figure 3 The insulating screw (5) shown has an insulating screw external thread (53) connected to the threaded hole (11) of the sensor body (1), an insulating screw internal thread (51) connected to the conversion screw external thread (72) of the conversion screw (7), an insulating screw upper base surface (52) connected to the bottom of the threaded hole of the sensor body (1), and a lower base surface (54) of the insulating screw lower base surface connected to the conversion screw connection surface (73).

[0024] Figure 4The conversion screw (7) shown has an external thread (72) connected to the insulating screw internal thread (51) of the insulating screw (5), and the conversion screw internal thread (75) is connected to the object to be measured through the mounting screw; the conversion screw upper surface (71) is connected to the bottom of the threaded hole (11) of the sensor body (1) and the insulating screw internal thread (51) of the insulating screw (5) through the glue storage groove; the conversion screw connection surface (73) is connected to the mounting base surface (12) of the sensor body (1) and the insulating screw external thread (53) of the insulating screw (5) through the glue storage groove, the conversion screw internal thread (75) is connected to the object to be measured through the mounting screw, and the base surface (74) is in contact with the surface of the object to be measured.

[0025] Figure 1-4 The present solution shows that the sensor body (1) is mounted on the conversion screw (7) by means of the insulating screw (5), and then mounted on the object to be measured, thereby achieving electrical isolation between the sensor and the object to be measured, improving the anti-interference capability of the sensor body, and the double connection of thread and adhesive ensures a safe and tight installation, which is conducive to ensuring the stability of the sensor body when detecting data.

[0026] In view of current practical needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of this utility model.

Claims

1. An isolated acceleration sensor, Features: The invention comprises a sensor body (1), wherein a threaded hole (11) is formed at the lower end of the sensor body (1), and a mounting base surface (12) is correspondingly provided at the lower end of the sensor body (1); an insulating screw (5) is provided between the sensor body (1) and the conversion screw (7); the threaded hole (11) of the sensor body (1) is connected to an insulating screw outer thread (53) of the insulating screw (5); an insulating screw inner thread (51) of the insulating screw (5) is connected to an insulating screw outer thread (72) of the conversion screw (7); a glue storage groove (13) is provided between the threaded hole (11) of the sensor body (1), an upper surface (71) of the conversion screw (7) and an insulating screw inner thread (51) of the insulating screw (5); and a glue blocking layer (6) is provided between the mounting base surface (12) of the sensor body (1), a conversion screw connection surface (73) of the mounting screw (7) and an insulating screw outer thread (53) of the insulating screw (5).

2. The isolated acceleration sensor according to claim 1, Features: An insulating screw (5) is connected to the threaded hole (11) at the lower end of the sensor body (1), and a conversion screw (7) is connected to the insulating screw (5).

3. An acceleration sensor according to claim 2, Features: The insulating screw (5) is threadedly connected to the conversion screw (7).

4. The isolated acceleration sensor according to claim 1, Features: The inner end of the glue storage groove (13) is filled with glue liquid (4), and the glue liquid (4) is in contact with the bottom of the hole of the sensor body (1) and the upper base surface (52) of the insulating screw.

5. The isolated acceleration sensor according to claim 4, Features: The glue is in contact with the bottom of the hole of the sensor body (1), the conversion screw connection surface (73) of the conversion screw (7), and the insulating screw external thread (53) of the insulating screw (5).

6. The isolated acceleration sensor according to claim 1, Features: An output line (2) is fixedly connected to the right end of the sensor body (1), and an outer sheath (3) is sleeved between the output line (2) and the sensor body (1).

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