A piezoelectric pressure sensor

Abstract

The application relates to the technical field of pressure sensors, and discloses a piezoelectric pressure sensor which comprises a connecting chamber, the left side of the connecting chamber is provided with a pumping assembly, the right side of the connecting chamber is provided with a mounting protection assembly, the front side of the connecting chamber is provided with a liquid level observation assembly, the liquid level observation assembly comprises a hollow box body, the right side of the hollow box body is fixedly connected with a connecting frame, and the front side of the hollow box body is fixedly connected with a liquid level display tube. The piezoelectric pressure sensor is provided with the liquid level observation assembly, the internal liquid level is displayed by the liquid level display tube on the front side, the scale range of the scale bar is calibrated according to the compressibility of the liquid and the expected pressure range of measurement, the optical magnifying glass can be used for facilitating observation of data during use, the data can be intuitively observed, optical liquid level display is realized, the pressure size can be converted according to the liquid level height, and the effect during use is good.

Description

Technical Field

[0001] This invention relates to the field of pressure sensor technology, specifically to a piezoelectric pressure sensor. Background Technology

[0002] In the vast field of modern technology, pressure measurement, as a key means of obtaining physical parameters, is widely used in various aspects such as industrial production, aerospace, medical equipment, automobile manufacturing, and daily life. Accurate and reliable pressure measurement plays a vital role in ensuring the safe operation of systems, optimizing production processes, improving product quality, and realizing intelligent control.

[0003] The prior art discloses a piezoelectric pressure sensor with announcement number CN220625562U, comprising a pressure sensor body. The pressure sensor body includes a fixed tube, a fixed seat movably mounted on the top of the fixed tube, a movable seat movably mounted on the side of the fixed seat, a movable ring movably mounted on the side of the movable seat, a fixed ring welded to the top of the movable ring, a slot on the fixed ring, a movable plate movably mounted inside the slot, a sliding groove on the side of the movable plate, and a slider welded inside the slot. The slider is slidably mounted inside the sliding groove via a reset mechanism. In this piezoelectric pressure sensor, the fixed tube is movably mounted on a support tube via a fixed post during use. Later, when the electronic components inside the fixed tube and the threaded tube are damaged, the fixed tube can be quickly disassembled from the support tube, thus only the fixed tube needs to be replaced, reducing maintenance costs.

[0004] The piezoelectric pressure sensor described above can move the movable ring up and down during use, and make one end of the movable rod contact the movable seat and the fixed seat respectively, thereby adjusting the exposed length of the movable plate, thereby increasing or decreasing the contact area between the device and the outside. However, the pressure sensor described above cannot provide an optical liquid level display of the internal liquid, and cannot calculate the pressure based on the liquid level height. Its performance during use is not good and needs to be improved. Summary of the Invention

[0005] The purpose of this invention is to provide a piezoelectric pressure sensor to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a piezoelectric pressure sensor, comprising a connecting chamber, an extraction component disposed on the left side of the connecting chamber, an installation and protection component disposed on the right side of the connecting chamber, and a liquid level observation component disposed on the front of the connecting chamber. The liquid chamber is constructed to form a closed liquid chamber, which is made of high-strength, transparent acrylic material. The acrylic plate on the side of the chamber is 3-5 mm thick, which can ensure sufficient strength to withstand pressure and meet the requirement of transparent observation.

[0007] The liquid level observation assembly includes a hollow box. A connecting bracket is fixedly connected to the right side of the hollow box. A liquid level display tube is fixedly connected to the front of the hollow box. A scale strip is fixedly connected to the left side of the front of the hollow box. A fixing plate is fixedly connected to the bottom left side of the front of the hollow box. A limit slide rod is fixedly connected to the top of the fixing plate. A limit carriage is fixedly connected to the front of the hollow box. A stepper motor is fixedly connected to the front of the limit carriage. A screw is fixedly connected to the output shaft of the stepper motor. A threaded sleeve is threaded onto the surface of the screw. The threaded sleeve is slidably connected to the surface of the limiting slide rod. A bearing plate is fixedly connected to the top front of the limiting slide, and a bearing plate is fixedly connected to the side of the threaded sleeve. The bearing plate is slidably connected to the inside of the limiting slide. An optical magnifying glass is fixedly connected to the front of the bearing plate. The liquid level observation component allows for intuitive data observation and optical liquid level display. It can calculate the pressure based on the liquid level height, providing good performance in use. A graduated scale is installed next to the liquid level display tube. The scale is made of stainless steel and has a graduation accuracy of 0.1 mm. The scale range is calibrated based on the compressibility of the liquid and the expected pressure range to be measured.

[0008] Preferably, the installation protection assembly includes a connecting box, a groove, a circuit element, a waterproof pad, a magnetic plate, a sealing cover, a magnetic plate, and a mating block. The connecting box is fixedly connected to the right side of the connecting chamber. The groove is formed on the right side of the connecting box. The circuit element is connected to the bottom of the connecting box. The waterproof pad is fixedly connected to the inner wall of the connecting box. The magnetic plate is fixedly connected to the back of the waterproof pad near the top. The magnetic plate is fixedly connected to the bottom of the sealing cover. The mating block is fixedly connected to the right side of the sealing cover. The installation protection assembly is configured such that the mating block can be inserted into the groove during placement. The cover slides downwards until the magnetic plate contacts the magnetic suction plate, and the two magnetically connect to lock and secure the sealed cover. This seals and protects the internal circuit components, ensuring normal operation. The connecting box also contains a shape memory alloy element, a pressure-sensitive element made of nickel-titanium shape memory alloy. The shape memory alloy element is straight, and by adjusting the composition and processing technology, its trigger pressure threshold is precisely controlled between 1-10 MPa. The shape memory alloy element is connected to a simple circuit consisting of a DC power supply, a resistor, and an alarm device connected in series. The DC power supply voltage is 3-12 volts, and the resistance value is selected according to the operating voltage and current requirements of the alarm device, generally between 100-1000 ohms. When the shape memory alloy element deforms and connects the circuit, the alarm device emits an alarm signal.

[0009] Preferably, the extraction assembly includes a connecting pipe, a threaded connecting section, a connector, a connecting ring, and an extraction tube. The connecting pipe is fixedly connected to the left side of the connecting chamber, the connector is fixedly connected to the left side of the threaded connecting section, the connecting ring is fixedly connected to the left side of the connector, and the extraction tube is fixedly connected to the left side of the connecting ring.

[0010] Preferably, the width of the mating block is adapted to the width of the groove, and the mating block is slidably connected to the right side of the connecting box.

[0011] Preferably, the area of ​​the sealing cover is adapted to the inner area of ​​the connecting box, so that it can be placed on top to block and seal the internal circuit components, ensuring normal operation.

[0012] Preferably, the limiting slide has a groove inside, the width of which can be adapted to the thickness of the support plate. This groove can drive the support plate to slide up and down inside the limiting slide, adjusting the position of the optical magnifying glass. The limiting slide can limit the sliding of the support plate, preventing its lateral sliding from affecting the normal use of the device.

[0013] Preferably, a bearing component is fixedly connected to the bottom of the bearing plate, and the top end of the screw is fixedly connected to the inner ring of the bearing component.

[0014] Preferably, the inner ring of the connecting pipe fitting has a threaded connection groove, and the threaded connection section is threaded into the inside of the connecting pipe fitting. Before being pulled in, the threaded connection section can be aligned with the threaded connection groove inside the connecting pipe fitting and then screwed in, which serves as a positioning function.

[0015] Preferably, the threaded sleeve has a circular groove inside, the diameter of which is adapted to the diameter of the limiting slide rod. The circular groove allows the threaded sleeve to pass through the limiting slide rod and slide to achieve limiting treatment, so that the threaded sleeve can rise and fall on the surface of the screw instead of spinning freely, ensuring the normal use of the device.

[0016] Preferably, the sealing cover is inserted into the top of the connecting box. When the sealing cover is placed on top of the connecting box, the mating block can be inserted into the groove, which can seal and protect the internal circuit components and ensure normal operation.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This piezoelectric pressure sensor features a liquid level observation component. The liquid level is displayed on the front of the sensor via a liquid level display tube. The scale range is calibrated based on the compressibility of the liquid and the expected pressure range. For convenient data observation, an optical magnifying glass can be used, allowing for direct observation of the data and optical liquid level display. The pressure can be calculated from the liquid level height, resulting in good performance. When the liquid level observation component is operational, the stepper motor starts, and its output shaft drives the screw to rotate. The threaded sleeve, connected to the screw, has an internal groove that matches the diameter of the limiting slide rod. Under the constraint of the limiting slide rod, it does not rotate freely with the screw but slides down its surface. The support plate fixed to the side of the threaded sleeve slides within the groove inside the limiting slide. Because the groove width matches the thickness of the support plate, lateral movement of the support plate is prevented, ensuring stable vertical movement. The position of the optical magnifying glass fixed to the front of the support plate is also adjusted.

[0019] This piezoelectric pressure sensor features a protective mounting assembly and a waterproof gasket, which provides excellent insulation and waterproofing for the connecting housing. During use, the sealing cover is placed on top of the connecting housing. When the cover is placed, the mating block is inserted into the groove and slides down until the magnetic plate contacts the magnetic suction plate. The two contact and magnetically connect, locking the sealing cover in place. This provides sealing protection for the internal circuit components, ensuring normal operation.

[0020] This piezoelectric pressure sensor is equipped with an extraction component. The threaded connection section is aligned with the threaded groove inside the connecting pipe and screwed in. The threaded connection section is screwed into the inside of the connecting pipe, and then liquid is introduced using the extraction tube. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional side view structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the three-dimensional structure of the extraction component of the present invention;

[0023] Figure 3 This is a schematic diagram of the overall three-dimensional front view structure of the present invention;

[0024] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0025] Figure 5 This is a three-dimensional structural diagram of the protective components installed in this invention;

[0026] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point B;

[0027] Figure 7 This is a three-dimensional structural diagram of the liquid level observation component of the present invention;

[0028] Figure 8 For the present invention Figure 7 Enlarged structural diagram at point C.

[0029] In the diagram: 1. Connecting chamber; 2. Extraction assembly; 201. Connecting pipe fitting; 202. Threaded connection section; 203. Connector; 204. Connecting ring; 205. Extraction tube; 3. Installation and protection assembly; 301. Connecting box; 302. Groove; 303. Circuit component; 304. Waterproof pad; 305. Magnetic suction plate; 306. Sealing cover; 307. Magnetic plate; 308. Connecting block; 4. Liquid level observation assembly; 401. Hollow box; 402. Connecting frame; 403. Liquid level display tube; 404. Scale bar; 405. Stepper motor component; 406. Limiting slide; 407. Fixing plate; 408. Limiting slide rod; 409. Threaded sleeve; 410. Screw; 411. Support plate; 412. Optical magnifying glass. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] Please see Figure 1-8 The present invention provides the following technical solutions:

[0033] A piezoelectric pressure sensor includes a connecting chamber 1, an extraction component 2 on the left side of the connecting chamber 1, a mounting and protective component 3 on the right side of the connecting chamber 1, and a liquid level observation component 4 on the front of the connecting chamber 1. The liquid chamber is constructed to form a closed liquid chamber, which is made of high-strength, transparent acrylic material. The acrylic plate on the side of the chamber is 3-5 mm thick, which can ensure sufficient strength to withstand pressure and meet the requirements of transparent observation.

[0034] The liquid level observation component 4 includes a hollow box 401. A connecting bracket 402 is fixedly connected to the right side of the hollow box 401. A liquid level display tube 403 is fixedly connected to the front of the hollow box 401. A scale bar 404 is fixedly connected to the left side of the front of the hollow box 401. A fixing plate 407 is fixedly connected to the bottom left side of the front of the hollow box 401. A limiting slide rod 408 is fixedly connected to the top of the fixing plate 407. A limiting slide 406 is fixedly connected to the front of the hollow box 401. A stepper is fixedly connected to the front of the limiting slide 406. The output shaft of the stepper motor 405 is fixedly connected to a screw 410. A threaded sleeve 409 is threadedly connected to the surface of the screw 410. The threaded sleeve 409 is slidably connected to the surface of the limiting slide 408. A bearing plate 411 is fixedly connected to the top front of the limiting slide 406. The bearing plate 411 is fixedly connected to the side of the threaded sleeve 409. The bearing plate 411 is slidably connected to the inside of the limiting slide 406. An optical magnifying glass 412 is fixedly connected to the front of the bearing plate 411. The liquid level observation component 4 is set up to provide a direct visual observation. The observation data is used for optical liquid level display, which can calculate the pressure based on the liquid level height. It performs well in use. The limiting slide 406 has an internal groove whose width is adapted to the thickness of the support plate 411, allowing the support plate 411 to slide up and down within the limiting slide 406. Adjusting the position of the optical magnifying lens 412, the limiting slide 406 limits the sliding of the support plate 411, preventing lateral slippage that could affect the normal operation of the device. The bottom of the support plate 411 is fixedly connected... A bearing is attached, and the top end of the screw 410 is fixedly connected to the inner ring of the bearing. A circular groove is formed inside the threaded sleeve 409, the diameter of which matches the diameter of the limiting slide rod 408. The groove allows the threaded sleeve 409 to pass through the limiting slide rod 408 for sliding and limiting, ensuring the threaded sleeve 409 can move up and down on the surface of the screw 410 instead of spinning freely, thus ensuring the normal operation of the device. A graduated scale is installed next to the liquid level display tube 403. The scale is made of stainless steel and has a graduation accuracy of 0.1 mm. The scale range is calibrated according to the compressibility of the liquid and the expected pressure range to be measured.

[0035] When the liquid level observation component 4 is working, the stepper motor component 405 starts, and its output shaft drives the screw 410 to rotate. The threaded sleeve 409, which is threaded to the screw 410, has an internal groove that matches the diameter of the limiting slide bar 408. Under the restriction of the limiting slide bar 408, it will not slide down the surface of the screw 410 without rotating freely. The support plate 411 fixed on the side of the threaded sleeve 409 slides in the groove inside the limiting slide 406. Because the width of the groove matches the thickness of the support plate 411, it can prevent the support plate 411 from moving laterally and ensure its stable up and down movement. The position of the optical magnifying glass 412 fixed on the front of the support plate 411 is also adjusted. At this time, the operator can directly observe the liquid level data through the scale made of stainless steel next to the liquid level display tube 403, which has a scale accuracy of 0.1 mm and is calibrated according to the compressibility of the liquid and the expected measurement pressure range. Then, based on the correspondence between the liquid level height and the pressure, the operator can calculate the current pressure, thereby realizing the functions of optical liquid level display and pressure measurement.

[0036] Preferably, the installation protective assembly 3 includes a connecting box 301, a groove 302, a circuit element 303, a waterproof pad 304, a magnetic plate 305, a sealing cover 306, a magnetic plate 307, and a docking block 308. The connecting box 301 is fixedly connected to the right side of the connecting chamber 1. The groove 302 is formed on the right side of the connecting box 301. The circuit element 303 is connected to the bottom of the inside of the connecting box 301. The waterproof pad 304 is fixedly connected to the inner wall of the connecting box 301. The magnetic plate 305 is fixedly connected to the back of the waterproof pad 304 near the top. The magnetic plate 307 is fixedly connected to the bottom of the sealing cover 306. The docking block 308 is fixedly connected to the right side of the sealing cover 306. The installation protective assembly 3 is positioned such that when placed... The connector 308 can be inserted into the groove 302 and slide down until the magnet plate 307 contacts the magnetic plate 305. The two contact and magnetically connect to lock and fix the sealing cover 306, which can seal and protect the internal circuit components 303 to ensure normal operation. The inside of the connecting box 301 is also equipped with a shape memory alloy element. The pressure sensitive element is made of nickel-titanium shape memory alloy. The shape memory alloy element is straight. By adjusting the composition and processing technology of the shape memory alloy, its trigger pressure threshold is precisely controlled between 1-10 MPa. The shape memory alloy element is connected to a simple circuit, which consists of a DC power supply, a resistor and an alarm device connected in series. The DC power supply voltage is 3-12 volts. The resistance value is selected according to the working voltage and current requirements of the alarm device, generally between 100-1000 ohms. When the shape memory alloy element deforms and connects the circuit, the alarm device emits an alarm signal. The sealing cover 306 is inserted into the top of the connecting box 301. When the sealing cover 306 is placed on the top of the connecting box 301, the mating block 308 can be inserted into the inside of the groove 302, which can seal and protect the internal circuit element 303 to ensure normal operation. The width of the mating block 308 is adapted to the width of the groove 302. The mating block 308 is slidably connected to the right side of the connecting box 301. The area of ​​the sealing cover 306 is adapted to the inner area of ​​the connecting box 301, which can be placed on top to block and seal and protect the internal circuit element 303 to ensure normal operation.

[0037] When installing the protective component 3, the sealing cover 306 is placed on top of the connecting box 301. At this time, the mating block 308, with its width adapted to the groove 302, is precisely inserted into the groove 302 and slides down along the right side of the connecting box 301 until the magnetic plate 307 fixed at the bottom of the sealing cover 306 contacts the magnetic suction plate 305 on the top back of the waterproof gasket 304 on the inner wall of the connecting box 301. The two are tightly connected by magnetic attraction, thereby firmly locking the sealing cover 306 and achieving sealing protection for the internal circuit components 303 of the connecting box 301. The waterproof gasket 304 further enhances the sealing effect and isolates external interference. Meanwhile, the nickel-titanium shape memory alloy pressure-sensitive element inside the connecting box 301 is in the shape of a straight strip. Through composition and process adjustment, the trigger pressure threshold is controlled at 1-10 MPa. It is connected to a circuit consisting of a 3-12 volt DC power supply, a 100-1000 ohm resistor and an alarm device connected in series. When the pressure causes the shape memory alloy element to deform and connect the circuit, the alarm device immediately issues an alarm signal, realizing the function of pressure abnormality monitoring and alarm, and ensuring the stability and reliability of the pressure sensor.

[0038] The extraction assembly 2 includes a connecting pipe 201, a threaded connecting section 202, a connector 203, a connecting ring 204, and an extraction tube 205. The connecting pipe 201 is fixedly connected to the left side of the connecting chamber 1, the connector 203 is fixedly connected to the left side of the threaded connecting section 202, the connecting ring 204 is fixedly connected to the left side of the connector 203, and the extraction tube 205 is fixedly connected to the left side of the connecting ring 204. The inner ring of the connecting pipe 201 has a threaded connecting groove. The threaded connecting section 202 is threaded into the inside of the connecting pipe 201. Before extraction, the threaded connecting section 202 can be aligned with the threaded connecting groove inside the connecting pipe 201 and then screwed in to serve a positioning function.

[0039] A piezoelectric pressure sensor includes a connecting chamber 1, an extraction component 2 on the left side of the connecting chamber 1, a mounting and protective component 3 on the right side of the connecting chamber 1, and a liquid level observation component 4 on the front of the connecting chamber 1. The liquid chamber is constructed to form a closed liquid chamber, which is made of high-strength, transparent acrylic material. The acrylic plate on the side of the chamber is 3-5 mm thick, which can ensure sufficient strength to withstand pressure and meet the requirements of transparent observation.

[0040] The liquid level observation component 4 includes a hollow box 401. A connecting bracket 402 is fixedly connected to the right side of the hollow box 401. A liquid level display tube 403 is fixedly connected to the front of the hollow box 401. A scale bar 404 is fixedly connected to the left side of the front of the hollow box 401. A fixing plate 407 is fixedly connected to the bottom left side of the front of the hollow box 401. A limiting slide rod 408 is fixedly connected to the top of the fixing plate 407. A limiting slide 406 is fixedly connected to the front of the hollow box 401. A stepper is fixedly connected to the front of the limiting slide 406. The output shaft of the stepper motor 405 is fixedly connected to a screw 410. A threaded sleeve 409 is threadedly connected to the surface of the screw 410. The threaded sleeve 409 is slidably connected to the surface of the limiting slide 408. A bearing plate 411 is fixedly connected to the top front of the limiting slide 406. The bearing plate 411 is fixedly connected to the side of the threaded sleeve 409. The bearing plate 411 is slidably connected to the inside of the limiting slide 406. An optical magnifying glass 412 is fixedly connected to the front of the bearing plate 411. The liquid level observation component 4 is set up to provide a direct visual observation. The observation data is used for optical liquid level display, which can calculate the pressure based on the liquid level height. It performs well in use. The limiting slide 406 has an internal groove whose width is adapted to the thickness of the support plate 411, allowing the support plate 411 to slide up and down within the limiting slide 406. Adjusting the position of the optical magnifying lens 412, the limiting slide 406 limits the sliding of the support plate 411, preventing lateral slippage that could affect the normal operation of the device. The bottom of the support plate 411 is fixedly connected... A bearing is attached, and the top end of the screw 410 is fixedly connected to the inner ring of the bearing. A circular groove is formed inside the threaded sleeve 409, the diameter of which matches the diameter of the limiting slide rod 408. The groove allows the threaded sleeve 409 to pass through the limiting slide rod 408 for sliding and limiting, ensuring the threaded sleeve 409 can move up and down on the surface of the screw 410 instead of spinning freely, thus ensuring the normal operation of the device. A graduated scale is installed next to the liquid level display tube 403. The scale is made of stainless steel and has a graduation accuracy of 0.1 mm. The scale range is calibrated according to the compressibility of the liquid and the expected pressure range to be measured.

[0041] Preferably, the installation protective assembly 3 includes a connecting box 301, a groove 302, a circuit element 303, a waterproof pad 304, a magnetic plate 305, a sealing cover 306, a magnetic plate 307, and a docking block 308. The connecting box 301 is fixedly connected to the right side of the connecting chamber 1. The groove 302 is formed on the right side of the connecting box 301. The circuit element 303 is connected to the bottom of the inside of the connecting box 301. The waterproof pad 304 is fixedly connected to the inner wall of the connecting box 301. The magnetic plate 305 is fixedly connected to the back of the waterproof pad 304 near the top. The magnetic plate 307 is fixedly connected to the bottom of the sealing cover 306. The docking block 308 is fixedly connected to the right side of the sealing cover 306. The installation protective assembly 3 is positioned such that when placed... The connector 308 can be inserted into the groove 302 and slide down until the magnet plate 307 contacts the magnetic plate 305. The two contact and magnetically connect to lock and fix the sealing cover 306, which can seal and protect the internal circuit components 303 to ensure normal operation. The inside of the connecting box 301 is also equipped with a shape memory alloy element. The pressure sensitive element is made of nickel-titanium shape memory alloy. The shape memory alloy element is straight. By adjusting the composition and processing technology of the shape memory alloy, its trigger pressure threshold is precisely controlled between 1-10 MPa. The shape memory alloy element is connected to a simple circuit, which consists of a DC power supply, a resistor and an alarm device connected in series. The DC power supply voltage is 3-12 volts. The resistance value is selected according to the working voltage and current requirements of the alarm device, generally between 100-1000 ohms. When the shape memory alloy element deforms and connects the circuit, the alarm device emits an alarm signal. The sealing cover 306 is inserted into the top of the connecting box 301. When the sealing cover 306 is placed on the top of the connecting box 301, the mating block 308 can be inserted into the inside of the groove 302, which can seal and protect the internal circuit element 303 to ensure normal operation. The width of the mating block 308 is adapted to the width of the groove 302. The mating block 308 is slidably connected to the right side of the connecting box 301. The area of ​​the sealing cover 306 is adapted to the inner area of ​​the connecting box 301, which can be placed on top to block and seal and protect the internal circuit element 303 to ensure normal operation.

[0042] The extraction assembly 2 includes a connecting pipe 201, a threaded connecting section 202, a connector 203, a connecting ring 204, and an extraction tube 205. The connecting pipe 201 is fixedly connected to the left side of the connecting chamber 1, the connector 203 is fixedly connected to the left side of the threaded connecting section 202, the connecting ring 204 is fixedly connected to the left side of the connector 203, and the extraction tube 205 is fixedly connected to the left side of the connecting ring 204. The inner ring of the connecting pipe 201 has a threaded connecting groove. The threaded connecting section 202 is threaded into the inside of the connecting pipe 201. Before extraction, the threaded connecting section 202 can be aligned with the threaded connecting groove inside the connecting pipe 201 and then screwed in to serve a positioning function.

[0043] In use, the liquid to be pressure tested is drawn into the connecting chamber 1 using the extraction component 2. Before extraction, the threaded connection section 202 can be aligned with the threaded groove inside the connecting pipe fitting 201 and then screwed in. After the threaded connection section 202 is screwed into the connecting pipe fitting 201, the liquid is introduced using the extraction tube 205. After the liquid is introduced into the connecting chamber 1, the liquid level can be observed using the liquid level observation component 4. The hollow box 401 is connected to the connecting chamber 1, so the liquid will also enter the connecting chamber 1. The liquid level can then be displayed using the liquid level display tube 403 on the front. The graduation range of the scale bar 404 is calibrated according to the compressibility of the liquid and the expected pressure range to be measured. For convenient data observation, it can be used with an optical magnifying glass 412. During use, the positions of the support plate 411 and the optical magnifying glass 412 can be adjusted in real time according to the liquid level. During adjustment, the stepper motor 405 can be activated to drive the screw 410 to rotate, allowing the threaded sleeve 409 to slide up and down along the surface of the screw 410. This allows the support plate 411 to slide up and down against the inside of the limiting slide 406. The position of the optical magnifying glass 412 is adjusted using a magnifying glass structure with a focal length of [missing information]. With a height of 3-5 cm and a diameter of 4-6 cm, it allows for intuitive observation of data and optical liquid level display. It can calculate the pressure based on the liquid level, providing good performance during use. A protective assembly 3 is installed on the right side of the connecting chamber 1. Circuit components 303 are placed inside the connecting housing 301. The waterproof gasket 304 provides excellent insulation and waterproofing for the connecting housing 301. During use, the sealing cover 306 can be placed on top of the connecting housing 301. When placing the housing, the mating block 308 can be inserted into the groove 302 and slide downwards until the magnetic plate 307 aligns with the magnetic suction plate. Contact 305 allows for magnetic connection, locking and securing the sealed cover 306. This seals and protects the internal circuit components 303, ensuring proper operation. The connecting housing 301 also houses a shape memory alloy element, a pressure-sensitive element made of nickel-titanium shape memory alloy. The shape memory alloy element is linear, and its trigger pressure threshold is precisely controlled between 1-10 MPa by adjusting its composition and processing technology. The shape memory alloy element is connected to a simple circuit consisting of a DC power supply, a resistor, and an alarm device connected in series. The DC power supply voltage is 3-12 volts, and the resistor value is selected based on the alarm device's operating voltage and current requirements, typically between 100-1000 ohms. When the shape memory alloy element deforms and connects to the circuit, the alarm device emits an alarm signal.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A piezoelectric pressure sensor comprising a connecting chamber (1), characterized in that: The front of the connecting chamber (1) is provided with a liquid level observation assembly (4); the liquid level observation assembly (4) comprises a hollow box body (401), the front of the hollow box body (401) is fixedly connected with a liquid level display tube (403), the front of the hollow box body (401) is fixedly connected with a limiting slide (406), the front of the limiting slide (406) is fixedly connected with a stepping motor (405), the output shaft of the stepping motor (405) is fixedly connected with a screw rod (410), the surface of the screw rod (410) is threadedly connected with a threaded sleeve (409), the threaded sleeve (409) is slidingly connected to the surface of a limiting slide rod (408), the front top of the limiting slide (406) is fixedly connected with a bearing plate (411), the side of the threaded sleeve (409) is fixedly connected with a bearing plate (411), the bearing plate (411) is slidingly connected to the inside of the limiting slide (406), the front of the bearing plate (411) is fixedly connected with an optical magnifying glass (412); The right side of the hollow box body (401) is fixedly connected with a connecting frame (402), the front left side of the hollow box body (401) is fixedly connected with a scale bar (404), the front left bottom of the hollow box body (401) is fixedly connected with a fixed plate (407), and the top of the fixed plate (407) is fixedly connected with a limiting slide rod (408).

2. A piezoelectric pressure sensor according to claim 1, characterised in that: The right side of the connecting chamber (1) is provided with a mounting protection assembly (3), the mounting protection assembly (3) comprises a connecting box (301), a groove (302) opened on the right side of the connecting box (301), a sealing cover plate (306) inserted on the top of the connecting box (301), and a butt joint block (308) fixedly connected on the right side of the sealing cover plate (306), the butt joint block (308) can be inserted into the inside of the groove (302).

3. A piezoelectric pressure sensor according to claim 2, characterised in that: It also includes a circuit element (303), a waterproof pad (304), a magnetic plate (305), and a magnet plate (307), the circuit element (303) is connected to the inside bottom end of the connecting box (301), the waterproof pad (304) is fixedly connected to the inner wall of the connecting box (301), the magnetic plate (305) is fixedly connected to the inside back of the waterproof pad (304) near the top, and the magnet plate (307) is fixedly connected to the bottom of the sealing cover plate (306).

4. A piezoelectric pressure sensor according to claim 2, wherein: The width of the butt joint block (308) is matched with the width of the groove (302), and the butt joint block (308) is slidingly connected to the right side of the connecting box (301).

5. A piezoelectric pressure sensor according to claim 2, wherein: The sealing cover plate (306) is inserted on the top of the connecting box (301), and the inside of the connecting box (301) is also provided with a shape memory alloy element, the shape memory alloy element is connected to a circuit, the circuit is composed of a direct current power supply, a resistor and an alarm device in series, when the shape memory alloy element is deformed to connect the circuit, the alarm device sends an alarm signal, and the sealing cover plate (306) is inserted on the top of the connecting box (301).

6. A piezoelectric pressure sensor according to claim 1, wherein: The bottom of the bearing plate (411) is fixedly connected with a bearing member, and the top end of the screw rod (410) is fixedly connected to the inner ring of the bearing member.

7. A piezoelectric pressure sensor according to claim 1, wherein: The interior of the threaded sleeve (409) is provided with a circular groove, and the diameter of the circular groove is matched with the diameter of the limiting sliding rod (408).

8. A piezoelectric pressure sensor according to claim 1, wherein: The left side of the connecting chamber (1) is provided with an extraction assembly (2), the extraction assembly (2) comprises a connecting pipe (201), a threaded connecting section (202), a connecting piece (203), a connecting ring (204) and an extraction pipe (205), the connecting pipe (201) is fixedly connected to the left side of the connecting chamber (1), the connecting piece (203) is fixedly connected to the left side of the threaded connecting section (202), the connecting ring (204) is fixedly connected to the left side of the connecting piece (203), and the extraction pipe (205) is fixedly connected to the left side of the connecting ring (204).

9. A piezoelectric pressure sensor according to claim 8, characterised in that: The inner ring of the connecting pipe (201) is provided with a threaded connecting groove, and the threaded connecting section (202) is threadedly connected to the interior of the connecting pipe (201).

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