A piezoelectric vibration sensor with radiation resistance

Abstract

The present invention relates to a piezoelectric vibration sensor with radiation resistance applied in the field of vibration sensor technology. The sensor comprises a base, a shielding base shell, a shielding cover, a colloid bushing, an inductor foil, an on-off detection circuit and an ionization alarm module. The present invention forms an ionizing radiation shielding structure by combining the shielding base shell and the shielding cover, thereby effectively improving the protection capability of the sensitive piezoelectric chip unit. When the shielding cover is broken, the inductor foil tightly attached to the inner wall of the shielding cover is torn, thereby disconnecting the inductor foil from the on-off detection circuit, and then an alarm is issued through the ionization alarm module. At the same time, the broken shielding cover is attached to the outer surface of the colloid bushing, so that the shielding cover maintains its original state outside the colloid bushing, and the shielding cover continues to provide shielding capability, which facilitates the staff to handle the fault in a timely manner.

Description

Technical Field

[0001] The present invention relates to a piezoelectric vibration sensor, in particular to a piezoelectric vibration sensor with radiation resistance function applied in the technical field of vibration sensors. Background Art

[0002] A piezoelectric vibration sensor is a sensor based on the piezoelectric effect. The sensitive element of the vibration sensor is made of piezoelectric material. When the piezoelectric material is subjected to force, an electric charge is generated on the surface. After the charge is amplified and the impedance is transformed by the charge amplifier and measurement circuit, it becomes an electrical output proportional to the external force. The piezoelectric material in the vibration sensor is easily damaged by radiation, affecting the use of the vibration sensor in high-radiation environments.

[0003] Chinese patent CN109269626A discloses a piezoelectric vibration sensor, wherein the piezoelectric element includes an upper electrode layer, at least two ceramic sheets, a conductive layer arranged between adjacent ceramic sheets, and a lower electrode layer. In this embodiment, the piezoelectric element includes an upper electrode layer, a first ceramic sheet, a conductive layer, a second ceramic sheet, and a lower electrode layer arranged in sequence. Chinese patent CN115980723A discloses a high-temperature, radiation-resistant ultrasonic ranging sensor, which protects the alloy matching component, piezoelectric ceramic component, and backing through a control component to delay damage to the expansion of the entire device caused by use in a high-temperature environment. At the same time, the ceramic characteristics of the piezoelectric ceramic component are utilized to enhance adaptability to the radiation environment, and metal and alloy materials are used to enhance the radiation resistance of the device, thereby improving the high-temperature resistance of the sensor.

[0004] Ceramics are often used as a shielding layer against radiation. The core value of ceramic shielding layers in vibration sensors is protection against extreme high temperatures, radiation, and corrosive environments. However, ceramics are brittle and easily crack under mechanical stress. At the same time, after the ceramic shielding layer cracks, staff cannot receive timely fault alerts, making it difficult to handle the fault in a timely manner. Summary of the Invention

[0005] In view of the above-mentioned existing technology, the technical problem to be solved by the present invention is that the brittleness of ceramics makes it easy for them to break under mechanical stress. At the same time, after the ceramic shielding layer breaks, the staff cannot receive the fault reminder in time, making it difficult to handle the fault in time.

[0006] To solve the above problems, the present invention provides a piezoelectric vibration sensor with radiation resistance, comprising a base, a shielding base shell fixedly connected to the interior of the base, a wire core module fixedly connected to the interior of the shielding base shell, a central shaft fixedly connected to the middle of the wire core module, a sensitive piezoelectric chip unit sleeved in the middle of the central shaft, and mass blocks sleeved on the top and bottom of the central shaft, the two mass blocks respectively contacting the top and bottom ends of the sensitive piezoelectric chip unit;

[0007] The top of the shielding base shell is fixedly connected to a shielding cover shell. Both the shielding base shell and the shielding cover shell are made of ceramic material. The sensitive piezoelectric chip unit and the mass block are both located inside the shielding cover shell. A colloid bushing is provided inside the shielding cover shell. The outer surface of the colloid bushing is fixedly inlaid with an inductor foil. The inductor foil is fixedly bonded to the inner wall of the shielding cover shell. The wire core module includes an on-off detection circuit. The inductor foil is fixedly connected to the on-off detection circuit. The output end of the on-off detection circuit is connected to the ionization alarm module.

[0008] In the above-mentioned piezoelectric vibration sensor with radiation resistance function, when the shielding shell is broken, the inductor foil is torn along with the breaking of the shielding shell, thereby disconnecting the inductor foil from the on-off detection circuit, and realizing the shielding shell breaking alarm.

[0009] As a further improvement of the present application, the outer surface of the colloid bushing is provided with annularly distributed recessed grooves. The colloid bushing is made of silicone rubber material. The recessed groove design of the colloid bushing enables it to shrink radially, which facilitates the colloid bushing to be inserted into the shielding cover. Moreover, due to the elasticity of the colloid bushing made of silicone rubber material, the shielding cover remains attached to the colloid bushing after rupture, thereby maintaining the partial shielding capability of the shielding cover, making it convenient for staff to deal with faults in a timely manner.

[0010] As a further improvement of the present application, the inductor foil is bent in a U-shape and is made of aluminum foil material, so that the inductor foil can be arranged over a larger area. The aluminum foil material has excellent conductive properties and is convenient for the inductor foil to tear following the rupture of the shielding shell.

[0011] As a further improvement of the present application, the outer sleeve of the shielding shell is provided with a protective shell, which is fixedly connected to the base, and the bottom of the base is fixedly connected with a grounding wire. The protective shell provides protection for the shielding shell and shields electromagnetic radiation.

[0012] As another improvement of the present application, a buffer ring is fixedly provided between the protective shell and the shielding cover shell. The buffer ring is made of aerogel material, and the protective shell is made of boron-aluminum alloy and boron-steel alloy material. The protective shell made of boron-aluminum alloy and boron-steel alloy material effectively improves the electromagnetic radiation shielding capability, and the buffer ring effectively realizes the buffering capability of the protective shell and the shielding base shell, further improving the protection effect of the shielding base shell.

[0013] As another improved supplement to the present application, a tensile copper mesh is embedded inside the colloid bushing, and the grounding wire is fixedly connected to the tensile copper mesh. The tensile copper mesh is used to effectively improve the tensile strength of the colloid bushing and effectively avoid excessive cracking and dislocation of the shielding shell.

[0014] As another improved supplement to the present application, the wire core module also includes a current detection circuit. The tensile copper mesh is fixedly connected to the current detection circuit. The output end of the current detection circuit is connected to an electromagnetic alarm module. The tensile copper mesh is used to achieve a second shielding against electromagnetic radiation. The current detection circuit detects whether there is current in the tensile copper mesh to determine whether the protective casing is damaged.

[0015] In summary, the present invention forms an ionizing radiation shielding structure by combining a shielding base shell and a shielding cover shell, thereby effectively improving the protection capability of sensitive piezoelectric chip units. When the shielding cover shell is broken, the inductor foil tightly attached to the inner wall of the shielding cover shell is torn, thereby disconnecting the inductor foil from the on-off detection circuit, and then an alarm is issued through the ionization alarm module. At the same time, the broken shielding cover shell is attached to the outer surface of the colloidal sleeve, so that the shielding cover shell maintains its original state outside the colloidal sleeve, and the shielding cover shell continues to provide shielding capability, which is convenient for staff to handle faults in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional structural diagram of the first embodiment of the present application;

[0017] Figure 2 This is a sectional three-dimensional structural diagram of the first embodiment of the present application;

[0018] Figure 3 This is a three-dimensional structural diagram of the colloid bushing according to the first embodiment of the present application;

[0019] Figure 4 This is a three-dimensional structural diagram of the inductor foil according to the first embodiment of the present application;

[0020] Figure 5 This is a system diagram of the ionization alarm module according to the first embodiment of the present application;

[0021] Figure 6 This is a three-dimensional structural diagram of the second embodiment of the present application;

[0022] Figure 7 This is a cross-sectional perspective structural diagram of the second embodiment of the present application;

[0023] Figure 8 This is a three-dimensional structural diagram of the tensile copper mesh according to the second embodiment of the present application;

[0024] Figure 9 This is a system diagram of the electromagnetic alarm module according to the second embodiment of the present application.

[0025] Description of the numbers in the figure:

[0026] 1. Base; 101. Shielding base shell; 102. Core module; 103. Center axis; 104. Sensitive piezoelectric chip unit; 105. Mass block; 2. Shielding cover; 201. Colloid bushing; 202. Inductor foil; 203. Recessed groove; 3. Protective shell; 301. Ground wire; 302. Buffer ring; 303. Tensile copper mesh. DETAILED DESCRIPTION

[0027] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0028] The first implementation method:

[0029] Figures 1 to 2 FIG1 shows a piezoelectric vibration sensor with radiation resistance, comprising a base 1, a shielding base shell 101 fixedly connected to the interior of the base 1, a core module 102 fixedly connected to the interior of the shielding base shell 101, the core module 102 is a signal circuit set of the vibration sensor, used to process the monitoring signal and transmit the signal to the control terminal of the vibration sensor, the control terminal of the vibration sensor is not described in detail in this technical solution, a central axis 103 fixedly connected to the middle of the core module 102, a sensitive piezoelectric chip unit 104 is sleeved in the middle of the central axis 103, a mass block 105 is sleeved on the top and bottom of the central axis 103, the two mass blocks 105 are respectively connected to the top and bottom of the sensitive piezoelectric chip unit 104, a shielding shell 2 is fixedly connected to the top of the shielding base shell 101, the shielding base shell 101 and the shielding shell 2 are both made of ceramic material, and the sensitive piezoelectric chip unit 104 and the mass block 105 are both inside the shielding shell 2;

[0030] The shielding base shell 101 and the shielding cover shell 2 are both made of ceramic material, which has excellent ionizing radiation shielding capabilities. Specifically, zirconia ceramic is preferred, which has strong resistance to HF acid, molten alkali metals, etc. The shielding base shell 101 and the shielding cover shell 2 are combined to form an ionizing radiation shielding structure, which effectively improves the ionizing radiation protection capability of the sensitive piezoelectric chip unit 104.

[0031] Figures 2 to 5It is shown that a colloid sleeve 201 is provided inside the shielding shell 2, and an inductive foil 202 is fixedly embedded on the outer surface of the colloid sleeve 201. The inductive foil 202 is fixedly bonded to the inner wall of the shielding shell 2. The core module 102 includes an on-off detection circuit. The inductive foil 202 is fixedly connected to the on-off detection circuit. The on-off detection circuit is a circuit design commonly used in this technical field. It determines whether the current can flow in the line by periodically transmitting current pulses to the line. The output end of the on-off detection circuit is connected to an ionization alarm module. In particular, the ionization alarm module includes a communication part and a working part. When the on-off detection circuit detects that there is no normal current flow, the information will be transmitted along with the signal of the vibration sensor in the form of a signal to the control terminal of the vibration sensor. The specific signal transmission method is selected according to the signal transmission method of the vibration sensor, wired transmission and wireless transmission. The communication part of the ionization alarm module receives the signal from the control terminal of the vibration sensor, and the working part of the ionization alarm module uses a buzzer and flashing light to alarm. The communication part and The model selection, specific connection and power supply method of the working part are all well-known technologies to those skilled in the art. Those skilled in the art can make reasonable selections according to actual usage conditions to meet the usage requirements of this application. The inductor foil 202 is bent in a U shape, and the inductor foil 202 is made of aluminum foil material, so that the inductor foil 202 can be arranged in a larger area. The U-shaped bent inductor foil 202 is more convenient for series connection. The aluminum foil material has excellent conductive properties and weak tear resistance, which is convenient for the inductor foil 202. Following the rupture of the shielding shell 2, tearing occurs. The outer surface of the gel bushing 201 is provided with annularly distributed concave grooves 203. The gel bushing 201 is made of silicone rubber material. The concave grooves 203 of the gel bushing 201 are designed to be radially shrinkable, which facilitates the gel bushing 201 to be inserted into the shielding shell 2. In addition, due to the elasticity of the gel bushing 201 made of silicone rubber material, the shielding shell 2 remains attached to the gel bushing 201 after rupture, maintaining the partial shielding capability of the shielding shell 2, and facilitating timely troubleshooting by staff.

[0032] When the shielding shell 2 is broken, the inductor foil 202 tightly attached to the inner wall of the shielding shell 2 is torn, thereby disconnecting the inductor foil 202 from the on-off detection circuit. The ionization alarm module connected to the on-off detection circuit sounds an alarm, reminding the staff to deal with the fault in time. At the same time, the broken shielding shell 2 is attached to the outer surface of the colloid bushing 201, and the shielding shell 2 maintains its original state outside the colloid bushing 201, which is similar to the spliced ​​ceramic state in the prior art. The radiation shielding ability of the spliced ​​ceramic is reduced compared to the complete ceramic, so that the shielding shell 2 continues to provide shielding ability, effectively avoiding the complete failure of the radiation shielding ability, and facilitating the staff to deal with the fault in time.

[0033] Second implementation method:

[0034] Figures 6 and 7 As shown, the outer sleeve of the shielding shell 2 is provided with a protective shell 3, which is fixedly connected to the base 1, and the bottom of the base 1 is fixedly connected to a grounding wire 301. The protective shell 3 provides protection for the shielding shell 2, and the protective shell 3 shields electromagnetic radiation. A buffer ring 302 is fixedly provided between the protective shell 3 and the shielding shell 2. The buffer ring 302 is made of aerogel material, and the protective shell 3 is made of boron aluminum alloy and boron steel alloy material. The protective shell 3 made of boron aluminum alloy and boron steel alloy material effectively improves the electromagnetic radiation shielding capability, and the buffer ring 302 effectively realizes the buffering capability of the protective shell 3 and the shielding base shell 101, further improving the protection effect of the shielding base shell 101;

[0035] The protective shell 3 is made of boron aluminum alloy and boron steel alloy materials, and is grounded and conductive through the grounding wire 301, which effectively improves the electromagnetic radiation shielding capability of the sensor and provides protection for the shielding cover 2. The buffer ring 302 effectively realizes the buffering capability of the protective shell 3 and the shielding base shell 101, effectively preventing the impact and collision of the protective shell 3 from being transmitted to the shielding cover 2, thereby effectively preventing the shielding cover 2 from rupture failure.

[0036] Figures 7 to 9 As shown, the interior of the colloid bushing 201 is inlaid with a tensile copper mesh 303, and the grounding wire 301 is fixedly connected to the tensile copper mesh 303. The tensile copper mesh 303 is used to effectively improve the tensile strength of the colloid bushing 201, and effectively avoid excessive rupture and dislocation of the shielding shell 2. The core module 102 also includes a current detection circuit, and the tensile copper mesh 303 is fixedly connected to the current detection circuit. The current detection circuit is a commonly used circuit design in this technical field, mainly used to determine whether there is current in the line. The output end of the current detection circuit is connected to an electromagnetic alarm module, and the electromagnetic alarm module is connected to the ionization alarm module in the first embodiment. The electromagnetic alarm module has the same structure and also includes a communication part and a working part. When the current detection circuit detects that there is current movement in the circuit, the communication part of the electromagnetic alarm module receives the signal from the control terminal of the vibration sensor, and the working part of the electromagnetic alarm module uses a buzzer and a flashing light to alarm, and the specific details of the buzzer and the flashing light are used to distinguish the alarm from the ionization alarm module. The model selection, specific connection and power supply method of the communication part and the working part of the electromagnetic alarm module are all well-known technologies to those skilled in the art. Those skilled in the art can make reasonable selections based on actual usage to meet the usage requirements of this application;

[0037] A tensile copper mesh 303 is embedded in the colloid bushing 201, which effectively improves the tensile strength of the colloid bushing 201, and enables the shielding shell 2 to pull the broken shielding shell 2 together to maintain its original shape, thereby effectively avoiding excessive rupture and dislocation of the shielding shell 2, and effectively improving the shielding shell 2 after rupture to retain more radiation shielding ability. When the protective shell 3 is damaged due to corrosion, the tensile copper mesh 303 is used to construct a second layer of electromagnetic radiation shielding capability, and the current detection circuit is used to detect whether there is current in the tensile copper mesh 303, so as to determine whether the protective shell 3 is damaged, and then the electromagnetic alarm module is used to alarm, so that the staff can deal with the fault problem of the protective shell 3 in time.

[0038] In view of current actual 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 the present invention.

Claims

1. A piezoelectric vibration sensor with radiation resistance, characterized in that: The invention comprises a base (1), wherein the interior of the base (1) is fixedly connected to a shielding base shell (101), the interior of the shielding base shell (101) is fixedly connected to a wire core module (102), the middle of the wire core module (102) is fixedly connected to a central axis (103), the middle of the central axis (103) is sleeved with a sensitive piezoelectric chip unit (104), the top and bottom of the central axis (103) are sleeved with mass blocks (105), and the two mass blocks (105) are respectively in contact with the top and bottom of the sensitive piezoelectric chip unit (104); The top of the shielding base shell (101) is fixedly connected to a shielding cover shell (2), the shielding base shell (101) and the shielding cover shell (2) are both made of ceramic material, the sensitive piezoelectric chip unit (104) and the mass block (105) are both located inside the shielding cover shell (2), a colloid bushing (201) is provided inside the shielding cover shell (2), an inductor foil (202) is fixedly embedded on the outer surface of the colloid bushing (201), the inductor foil (202) is fixedly bonded to the inner wall of the shielding cover shell (2), the wire core module (102) includes an on-off detection circuit, the inductor foil (202) is fixedly connected to the on-off detection circuit, and the output end of the on-off detection circuit is connected to an ionization alarm module.

2. The piezoelectric vibration sensor with radiation resistance according to claim 1, characterized in that: The outer surface of the colloid bushing (201) is provided with annularly distributed concave grooves (203), and the colloid bushing (201) is made of silicone rubber material.

3. The piezoelectric vibration sensor with radiation resistance according to claim 1, characterized in that: The inductor foil (202) is bent in a U-shape, and the inductor foil (202) is made of aluminum foil material.

4. The piezoelectric vibration sensor with radiation resistance according to claim 1, characterized in that: The shielding shell (2) is externally sleeved with a protective shell (3), the protective shell (3) is fixedly connected to the base (1), and the bottom of the base (1) is fixedly connected to a grounding wire (301).

5. The piezoelectric vibration sensor with radiation resistance according to claim 4, characterized in that: A buffer ring (302) is fixedly provided between the protective shell (3) and the shielding cover (2); the buffer ring (302) is made of aerogel material, and the protective shell (3) is made of boron aluminum alloy and boron steel alloy material.

6. The piezoelectric vibration sensor with radiation resistance according to claim 4, characterized in that: A tensile copper mesh (303) is embedded in the interior of the colloid bushing (201), and the grounding wire (301) is fixedly connected to the tensile copper mesh (303).

7. The piezoelectric vibration sensor with radiation resistance according to claim 6, characterized in that: The wire core module (102) further comprises a current detection circuit, the tensile copper mesh (303) is fixedly connected to the current detection circuit, and the output end of the current detection circuit is connected to an electromagnetic alarm module.

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