Sensor protection device, sensor with protection device and installation method thereof

Abstract

The present invention discloses a sensor protection device, a sensor with a protection device, and an installation method thereof, which solves the problem that existing sensor protection devices do not have high-frequency and high-amplitude wave head filtering and fragment protection functions, and the reliability of signal measurement is difficult to ensure. Specifically, it includes a protective cover and a filtering insulation mechanism located inside the protective cover; a plurality of first through holes corresponding to the sensitive surfaces of the sensors to be protected are provided at the center of the top of the protective cover, and a second through hole for the cables of the sensors to be protected to pass through is provided on the side wall; the filtering insulation mechanism includes a mounting sleeve coaxially sleeved inside the protective cover, an insulating layer coaxially sleeved inside the mounting sleeve, and a reinforcement sleeve coaxially sleeved inside the insulation layer; one end of the mounting sleeve is fixed at the top of the protective cover, and a third through hole is provided at the center of the other end; the insulating layer is pressed between the mounting sleeve and the reinforcement sleeve, and between the reinforcement sleeve and the inner wall of the top of the protective cover; the inner wall of the reinforcement sleeve matches the shape of the sensor to be protected.

Description

Technical Field

[0001] The invention relates to a protective device, in particular to a sensor protective device for measuring surface overpressure in an explosion vicinity, a sensor with the protective device and an installation method thereof. Background Art

[0002] During a near-ground explosion, the explosive energy propagates outward in the form of a shock wave and interacts with the ground. The load history at the ground surface serves as a key indicator for evaluating the intensity of the ground shock wave and the coupling of explosive energy. Reliably acquiring the surface shock wave waveform at different locations is crucial for studying the ground shock load of ground explosions. A typical near-ground explosion shock wave waveform typically consists of a high-frequency wavefront followed by a subsequent low-frequency decay process. The wavefront typically has a high amplitude but a small energy contribution. After coupling to the ground surface, it rapidly decays and dissipates. The subsequent low-frequency decay process of overpressure is the primary component of the explosive energy, and its decay time history is the primary factor in the formation of the ground shock wave. In actual measurements, sensors must survive the high-amplitude wavefront and the loading of explosion product fragments to capture the subsequent overpressure time history. To address this technical issue, the traditional approach is to install a porous structure on the sensitive surface of the sensor. This porous structure can filter out the high-frequency components of the explosion shock wave and provide some protection against the resulting fragments. However, these sensors are expensive, and in practice, the structure is often buried in dust, resulting in clogged measurement holes and difficulty in cleaning, making the entire measurement device essentially unreusable. Inexpensive sensors lack high-frequency, high-amplitude wave head filtering and fragment protection. Moreover, if the sensor is buried directly in the ground, its measurement circuit is easily short-circuited by the ground medium, causing distortion in the sensor's measurement signal and making it difficult to ensure signal measurement reliability. Summary of the Invention

[0003] The purpose of the present invention is to provide a sensor protection device, a sensor with a protection device and an installation method thereof, so as to solve the technical problems that the existing sensor protection device does not have high-frequency and high-amplitude wave head filtering and fragment protection functions, and that after the sensor is directly buried in the ground, its measurement circuit is easily short-circuited by the ground medium, which leads to distortion of the sensor measurement signal and difficulty in ensuring the reliability of signal measurement.

[0004] In order to achieve the above object, the present invention provides a sensor protection device, which has the following features: it includes a protection cover and a filter insulation mechanism located inside the protection cover;

[0005] The protective cover is cylindrical with closed ends, and a plurality of first through holes corresponding to the sensitive surfaces of the sensors to be protected are provided at the center of the top thereof, and second through holes for the cables of the sensors to be protected to pass through are provided on the side walls thereof;

[0006] The filtering insulation mechanism includes a mounting sleeve coaxially sleeved in the protective cover and with an opening at the upper end, a semi-enclosed insulating layer coaxially sleeved in the mounting sleeve, and a reinforcement sleeve coaxially sleeved in the insulating layer; one end of the mounting sleeve is fixed at the top of the protective cover, and a third through hole for the cable of the sensor to be protected to pass through is provided in the center of the other end of the mounting sleeve; the insulating layer is pressed between the mounting sleeve and the reinforcement sleeve and between the reinforcement sleeve and the inner wall of the top end of the protective cover; the inner wall of the reinforcement sleeve matches the shape of the sensor to be protected.

[0007] Furthermore, in order to prevent small particles from damaging the sensor to be protected, the present invention makes the following improvements:

[0008] A copper mesh is provided between the inner wall of the top of the protective cover and the sensitive surface of the sensor to be protected;

[0009] The edge of the copper mesh is pressed tightly between the insulating layer and the inner wall of the top end of the protective cover.

[0010] Furthermore, the insulating layer includes a round insulating sleeve, an annular bakelite pad and an annular rubber pad;

[0011] The insulating sleeve is sleeved between the installation sleeve and the reinforcement sleeve;

[0012] The bakelite pad is placed between the inner wall of the bottom surface of the installation sleeve and the lower end surface of the insulating sleeve and between the inner wall of the bottom surface of the installation sleeve and the lower end surface of the reinforcement sleeve;

[0013] The rubber pad is placed between the upper end surface of the reinforcement sleeve and the inner wall of the top end of the protective cover, so that a cavity for uniform shock waves is formed between the sensitive surface of the sensor to be protected and the inner wall of the top end of the protective cover;

[0014] The edge of the copper mesh is pressed tightly between the inner wall of the top end of the protective cover and the rubber pad.

[0015] Furthermore, in order to isolate the contact and prevent the protected sensor from falling out, the present invention makes the following improvements:

[0016] The outer diameter of the bakelite pad is equal to the outer diameter of the insulating sleeve, and the inner diameter thereof is smaller than the outer diameter of the reinforcement sleeve;

[0017] The outer diameter of the rubber pad is equal to the inner diameter of the insulating sleeve, and its inner diameter is between the inner diameter of the reinforcement sleeve and the outer diameter of the sensitive surface of the sensor to be protected;

[0018] The diameter of the third through hole is smaller than the outer diameter of the reinforcement sleeve and larger than the maximum outer diameter of the sensor to be protected.

[0019] Furthermore, in order to protect the cables and facilitate replacement of external connection components, the present invention makes the following improvements:

[0020] It also includes transfer of custody;

[0021] One end of the adapter tube extends into the second through hole and is threadedly connected to the protective cover, and the other end is used to connect to the external cable protection tube;

[0022] An annular limiting protrusion is provided on the outer wall of the transfer tube, and the annular limiting protrusion contacts the outer wall of the protective cover.

[0023] Furthermore, the protective cover includes a protective tube and a lower cover plate and an upper cover plate mounted on both ends of the protective tube;

[0024] The first through hole is provided in the middle of the upper cover plate;

[0025] The second through hole is provided on the protective tube and is close to the lower cover plate;

[0026] One end of the installation sleeve is connected to the upper cover plate.

[0027] Furthermore, in order to reduce vibration, the present invention makes the following improvements:

[0028] Also includes cushioning and shock-resistant padding;

[0029] The buffering and anti-vibration filler is filled in the protective cover.

[0030] The present invention also provides a sensor with a protective device, which is special in that it comprises a sensor and the above-mentioned sensor protective device;

[0031] The sensor is sleeved in the reinforcement sleeve, with its sensitive surface facing the first through hole, and its cable is led out through the third through hole and the second through hole in sequence.

[0032] Furthermore, the sensor to be protected is a pressure sensor.

[0033] The present invention also provides a method for installing a sensor with a protective device, which is special in that it includes the following steps:

[0034] Step 1: Inspection and preparation before use;

[0035] Check that all components are intact and clean the inside of the protective tube, the inner and outer walls of the installation sleeve, the inner and outer walls of the reinforcement sleeve, and the first through hole on the upper cover;

[0036] Step 2: Assemble the filter insulation components;

[0037] Place the bakelite pad at the bottom of the mounting sleeve, and pass the sensor cable through the third through-hole and the second through-hole in sequence. Put the reinforcement sleeve on the outside of the sensor, and then put the insulating sleeve on the outside of the reinforcement sleeve. Then, put the sensor, reinforcement sleeve and insulating sleeve into the mounting sleeve as a whole, and place the rubber pad on the top of the reinforcement sleeve.

[0038] Step 3, assemble the protective cover;

[0039] Install the upper cover plate on the protective tube and the mounting sleeve, and install the lower cover plate on the lower end of the protective tube.

[0040] Furthermore, before installing the lower cover plate on the lower end of the protective tube in step 3, the step of filling the protective tube with a buffering and shock-resistant material is also included.

[0041] Beneficial effects of the present invention:

[0042] 1. The sensor protection device of the present invention includes a filtering insulation mechanism and a protective cover. The protection device can measure surface impact loads with a simple structure and low cost. The filtering insulation mechanism filters high-frequency spikes and prevents interference from fragments through multiple first through holes on the top of the protective cover. The semi-enclosed insulation layer prevents sensor loss and ensures the accuracy of measurement results. The protective cover protects the sensor to ensure its survival in harsh environments and improve its reuse rate.

[0043] 2. The present invention places a copper mesh between the upper cover plate and the rubber pad. The porous structure of the copper mesh can filter fine particles to prevent damage to the sensitive surface of the sensor.

[0044] 3. The present invention uses an annular bakelite pad made of hard material and places the bakelite pad between the reinforcement sleeve and the installation sleeve, which can not only isolate the contact but also reduce the vibration of the sensor during the impact measurement process.

[0045] 4. The present invention forms a cavity between the sensitive surface of the sensor to be protected and the inner wall of the top of the protective cover through the rubber pad. The cavity can homogenize the filtered shock wave so that it hits the sensor evenly.

[0046] 5. The present invention provides a transfer tube on the protective tube, which is threadedly connected to the protective tube, making it easy to process, install and replace external connecting parts.

[0047] 6. The present invention provides a third through hole at the lower end of the mounting sleeve, which facilitates the sensor to be protected to pass through from below the mounting sleeve, reduces the threading workload, and can prevent the reinforced sensor to be protected from falling off from the mounting sleeve.

[0048] 7. The present invention also fills the protective cover with buffering and shock-resistant materials to buffer and reduce vibrations, thereby protecting the cables and allowing the sensor to be placed closer to the ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a partial cross-sectional view of a sensor protection device of the present invention;

[0050] Figure 2 is a cross-sectional view of a sensor protection device of the present invention;

[0051] Figure 3 is a top view of a sensor protection device of the present invention;

[0052] Figure 4 is a top view of the mounting sleeve in an embodiment of the present invention;

[0053] Figure 5 yes Figure 4 Middle AA cross-section;

[0054] Figure 6 is a top view of the upper cover plate in an embodiment of the present invention;

[0055] Figure 7 yes Figure 6 Middle AA cross-section.

[0056] Figure Number:

[0057] 1. Lower cover, 2. Countersunk screws, 3. Protective tube, 4. Mounting sleeve, 5. Bakelite pad, 6. Insulating sleeve, 7. Reinforcement sleeve, 8. Rubber pad, 9. Sensor, 10. Screws, 11. Upper cover, 12. Adapter tube, 13. Cable protection tube. DETAILED DESCRIPTION

[0058] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0059] A sensor protection device, combined with Figure 1 and Figure 2 As shown, the protective device includes a protective cover made of aluminum alloy and a filter insulation mechanism located inside the protective cover; the protective cover includes a protective tube 3 and a lower cover plate 1 and an upper cover plate 11 mounted on the upper and lower ends of the protective tube 3. The upper and lower end surfaces of the protective tube 3 are provided with screw holes corresponding to the circumferences of the lower cover plate 1 and the upper cover plate 11, and the protective cover is fixed by countersunk screws 2 to form a protective cover; Figure 3As shown, nine primary through-holes, corresponding to the sensitive surfaces of the sensors 9 to be protected, are evenly distributed throughout the center of the upper cover 11. The protective tube 3 is provided with secondary through-holes for the cables of the sensors 9 to be protected. These secondary through-holes are located near the lower cover 1. A transfer tube 12 is connected to the secondary through-holes. One end of the transfer tube 12 extends into the secondary through-holes and is threadedly connected to the protective cover. The other end is connected to an external cable protection tube 13. An annular stopper protrusion is provided on the outer wall of the transfer tube 12, which contacts the outer wall of the protective tube 3 to provide position control. A copper mesh is placed between the upper cover 11 and the sensitive surface of the sensors 9 to be protected. The protective cover is also filled with a cushioning and anti-vibration filler.

[0060] The filtering insulation mechanism includes a mounting sleeve 4 coaxially sleeved in the protective cover and with an opening at the upper end, a semi-enclosed insulating layer coaxially sleeved in the mounting sleeve 4, and a reinforcement sleeve 7 coaxially sleeved in the insulating layer; one end of the mounting sleeve 4 is connected to the upper cover plate 11, and a third through hole for the cable of the sensor to be protected 9 to pass through is provided in the center of the other end of the mounting sleeve 4; the diameter of the third through hole is smaller than the outer diameter of the reinforcement sleeve 7 and larger than the maximum outer diameter of the sensor to be protected 9. The insulating layer is pressed between the installation sleeve 4 and the reinforcement sleeve 7 and between the reinforcement sleeve 7 and the inner wall of the top of the protective cover to isolate the contact. The insulating layer includes a round insulating sleeve 6, an annular bakelite pad 5 and an annular rubber pad 8. The insulating sleeve 6, bakelite pad 5 and rubber pad 8 form a semi-enclosed insulating layer; the insulating sleeve 6 is sleeved between the installation sleeve 4 and the reinforcement sleeve 7; the outer diameter of the bakelite pad 5 is equal to the outer diameter of the insulating sleeve 6, and its inner diameter is smaller than the outer diameter of the reinforcement sleeve 7; the bakelite pad 5 is padded between the inner wall of the bottom surface of the installation sleeve 4 and the lower end surface of the insulating sleeve 6. and between the inner wall of the bottom surface of the mounting sleeve 4 and the lower end surface of the reinforcement sleeve 7; it can be understood that the bakelite pad 5 is arranged around the third through hole; the outer diameter of the rubber pad 8 is equal to the inner diameter of the insulating sleeve 6, and its inner diameter is between the inner diameter of the reinforcement sleeve 7 and the outer diameter of the sensitive surface of the sensor 9 to be protected; the rubber pad 8 is placed between the upper end surface of the reinforcement sleeve 7 and the inner wall of the upper cover 11, and its thickness is slightly larger than the gap between the upper cover 11 and the reinforcement sleeve 7, so that a cavity for uniform shock waves is formed between the sensitive surface of the sensor 9 to be protected and the inner wall of the upper cover 11. The edge of the copper mesh is pressed between the inner wall of the upper cover 11 and the rubber pad 8; the inner wall of the reinforcement sleeve 7 matches the shape of the sensor 9 to be protected, that is, the sensor 9 to be protected is installed in the reinforcement sleeve 7, and the two are connected by threads and placed in a semi-enclosed structure formed by the insulating layer;.

[0061] A sensor with a protective device includes a sensor 9 and the above-mentioned sensor protective device; the sensor 9 is sleeved in the reinforcement sleeve 7, with its sensitive surface facing the first through hole, and its cable passes through the third through hole and the second through hole in sequence.

[0062] A sensor method with a protective device comprises the following steps:

[0063] Step 1: Inspection and preparation before use;

[0064] First, check whether all components are intact and clean the inside of the protective tube 3, the inner and outer walls of the installation sleeve 4, the inner and outer walls of the reinforcement sleeve 7, and the first through hole on the upper cover plate 11;

[0065] Step 2: Assemble the filter insulation components;

[0066] Place the bakelite pad 5 at the bottom of the installation sleeve 4, and pass the cable of the sensor 9 through the third through hole and the second through hole in sequence. Put the reinforcement sleeve 7 on the outside of the sensor 9, and then put the insulating sleeve 6 on the outside of the reinforcement sleeve 7. Then, put the sensor 9, reinforcement sleeve 7 and insulating sleeve 6 into the installation sleeve 4 as a whole, and place the rubber pad 8 on the top of the reinforcement sleeve 7;

[0067] Step 3, assemble the protective cover;

[0068] Install the upper cover plate 11 on the protective tube 3 and the mounting sleeve 4, connect the upper cover plate 11 to the protective tube with the countersunk screws 2, connect the upper cover plate 11 to the mounting sleeve 4 with the screws 10, fill the protective tube 3 with buffering and shock-resistant material, and install the lower cover plate 1 on the lower end of the protective tube 3 with the countersunk screws 2.

[0069] With its simple structure and low cost, the present invention ensures the reliable survival of pressure sensors in environments impacted by shock waves and fragments, enabling the measurement of surface overpressure decay during near-surface explosion experiments. It also filters out high-frequency, high-amplitude spikes in surface impact loads, preventing sensor charge leakage during measurement and reducing external environmental interference, ensuring the accuracy and reliability of experimental data and meeting experimental design requirements. Furthermore, the protective system utilizes screw connections and snap-on connections, making assembly and disassembly easy and time-saving. The present invention boasts a simple structure, low cost, easy installation, excellent compatibility, and ease of use.

[0070] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A sensor protection device, characterized in that: It includes a protective cover and a filter insulation mechanism located in the protective cover; The protective cover is cylindrical with both ends closed, and a plurality of first through holes corresponding to the sensitive surfaces of the sensors (9) to be protected are provided at the center of the top end thereof, and a second through hole for the cables of the sensors (9) to be protected to pass through is provided on the side wall thereof; The filtering insulation mechanism comprises a mounting sleeve (4) coaxially sleeved in the protective cover and having an upper opening, a semi-enclosed insulating layer coaxially sleeved in the mounting sleeve (4), and a reinforcing sleeve (7) coaxially sleeved in the insulating layer; one end of the mounting sleeve (4) is fixed at the top of the protective cover, and a third through hole for the cable of the sensor to be protected (9) to pass through is provided at the center of the other end of the mounting sleeve (4); the insulating layer is compressed between the mounting sleeve (4) and the reinforcing sleeve (7) and between the reinforcing sleeve (7) and the inner wall of the top of the protective cover; the inner wall of the reinforcing sleeve (7) matches the outer shape of the sensor to be protected (9); A copper mesh is provided between the inner wall of the top end of the protective cover and the sensitive surface of the sensor (9) to be protected; The edge of the copper mesh is pressed tightly between the insulating layer and the inner wall of the top of the protective cover; The insulating layer comprises an insulating sleeve (6), an annular bakelite pad (5) and an annular rubber pad (8); The insulating sleeve (6) is sleeved between the installation sleeve (4) and the reinforcement sleeve (7); The bakelite pad (5) is placed between the inner wall of the bottom surface of the installation sleeve (4) and the lower end surface of the insulating sleeve (6), and between the inner wall of the bottom surface of the installation sleeve (4) and the lower end surface of the reinforcement sleeve (7); The rubber pad (8) is placed between the upper end surface of the reinforcement sleeve (7) and the inner wall of the top end of the protective cover, so that a cavity for uniform shock waves is formed between the sensitive surface of the sensor (9) to be protected and the inner wall of the top end of the protective cover; The edge of the copper mesh is pressed tightly between the inner wall of the top end of the protective cover and the rubber pad (8).

2. The sensor protection device according to claim 1, characterized in that: The outer diameter of the bakelite pad (5) is equal to the outer diameter of the insulating sleeve (6), and the inner diameter thereof is smaller than the outer diameter of the reinforcing sleeve (7); The outer diameter of the rubber pad (8) is equal to the inner diameter of the insulating sleeve (6), and its inner diameter is between the inner diameter of the reinforcement sleeve (7) and the outer diameter of the sensitive surface of the sensor to be protected (9); The diameter of the third through hole is smaller than the outer diameter of the reinforcement sleeve (7) and larger than the maximum outer diameter of the sensor to be protected (9).

3. The sensor protection device according to claim 1 or 2, characterized in that: Also included is a transfer tube (12); One end of the transfer tube (12) extends into the second through hole and is threadedly connected to the protective cover, and the other end is used to connect to an external cable protection tube (13); An annular limiting protrusion is provided on the outer wall of the transfer tube (12), and the annular limiting protrusion contacts the outer wall of the protective cover.

4. The sensor protection device according to claim 3, characterized in that: The protective cover comprises a protective tube (3) and a lower cover plate (1) and an upper cover plate (11) mounted on both ends of the protective tube (3); The first through hole is provided in the middle of the upper cover plate (11); The second through hole is provided on the protective tube (3) and is arranged close to the lower cover plate (1); One end of the mounting sleeve (4) is connected to the upper cover plate (11).

5. The sensor protection device according to claim 1, characterized in that: Also included are cushioning and shock-resistant padding; The buffering and shock-resistant filler is filled in the protective cover.

6. A sensor with a protective device, characterized in that: comprising a sensor (9) and a sensor protection device according to any one of claims 1 to 5; The sensor (9) is sleeved in the reinforcement sleeve (7), with its sensitive surface facing the first through hole, and its cable is led out through the third through hole and the second through hole in sequence.

7. A method for installing a sensor with a protective device, used for the sensor protective device according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Inspection and preparation before use; Check that all components are intact and clean the inside of the protective tube (3), the inner and outer walls of the mounting sleeve (4), the inner and outer walls of the reinforcement sleeve (7), and the first through hole on the upper cover (11); Step 2: Assemble the filter insulation components; Place the bakelite pad (5) at the bottom of the installation sleeve (4), and pass the cable of the sensor (9) through the third through hole and the second through hole in sequence, put the reinforcement sleeve (7) on the outside of the sensor (9), and then put the insulating sleeve (6) on the outside of the reinforcement sleeve (7), and then put the sensor (9), the reinforcement sleeve (7) and the insulating sleeve (6) into the installation sleeve (4) as a whole, and place the rubber pad (8) on the top of the reinforcement sleeve (7); Step 3, assemble the protective cover; The upper cover plate (11) is mounted on the protective tube (3) and the mounting sleeve (4), and the lower cover plate (1) is mounted on the lower end of the protective tube (3).

8. The method for installing a sensor with a protective device according to claim 7, wherein: Before the lower cover plate (1) is installed on the lower end of the protective tube (3) in step 3, the step of filling the protective tube (3) with a buffering and anti-vibration material is also included.

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