Water level detection device based on memory alloy material

Abstract

The utility model discloses a water level detection device based on memory alloy material belongs to building engineering safety monitoring technical field, include: casing, be provided with the flow guide hole for medium through on the casing, diaphragm, fixed mounting in the casing and closed flow guide hole setting, transmission shaft, slidingly installed in the casing and with diaphragm fixed connection, two terminals, fixed mounting in the casing and are connected with signal processing module through cable, memory alloy wire, two ends are connected in two terminals respectively, and transmission shaft is connected in the middle section of memory alloy wire away from diaphragm end, medium flows into and extrudes diaphragm by flow guide hole can make transmission shaft remove to the direction of flow guide hole to stretch memory alloy wire to make the resistance of memory alloy wire between two terminals with strain linear variation, signal processing module is based on resistance value change calculation water level height. The application can realize the automatic continuous monitoring and intelligent control of water level based on the resistance of memory alloy wire with strain linear variation.

Description

Technical Field

[0001] This utility model relates to the field of building engineering safety monitoring technology, and in particular to a foundation pit water level detection device and method based on nickel-titanium shape memory alloy, which is applicable to real-time and automated monitoring and early warning of groundwater level in deep foundation pit dewatering projects. Background Technology

[0002] With the accelerating pace of urbanization and the continuous expansion of urban space, the construction environment for underground engineering projects is becoming increasingly complex. In deep foundation pit projects, the control of confined water in the dewatering process is a crucial step, directly impacting slope stability and the prevention of risks such as quicksand or sudden inrush. Traditional dewatering control methods primarily rely on manual, periodic monitoring of water levels and operation of pumps, which is inefficient and lacks timeliness. As the scale of foundation pits increases and the number of wells grows (sometimes reaching hundreds or more), manual management becomes difficult and costly, and human factors easily introduce uncertainty.

[0003] While automated precipitation monitoring technology offers advantages such as real-time monitoring, accuracy, and early warning capabilities, it remains in its early stages. Existing automated devices primarily focus on early warning and lack automatic intervention capabilities. Furthermore, water level monitoring devices are structurally complex, and their accuracy, failure rate, and durability have significant room for improvement under harsh construction environments, long-term monitoring, and frequent turnover conditions. Therefore, there is an urgent need for a simplified, highly reliable, and intelligent water level detection device to enhance the automation level of foundation pit dewatering projects.

[0004] To address the aforementioned problems, this invention proposes a device and method for detecting water levels in foundation pits based on nickel-titanium shape memory alloy (NiTiSMA) material. Through material innovation and structural optimization, it enables real-time monitoring and intelligent control of water levels. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a water level detection device based on shape memory alloy materials to solve the problems of low efficiency of manual monitoring and complex structure and poor durability of existing automated devices. This device achieves high-sensitivity water level detection by utilizing the linear strain-resistance characteristics of shape memory alloy materials.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model provides a water level detection device based on shape memory alloy material, comprising:

[0008] The housing has a flow guide hole that communicates with the outside world, and the flow guide hole is used for the passage of medium;

[0009] The diaphragm is fixedly installed inside the housing and the flow guide hole is sealed.

[0010] A drive shaft is slidably installed inside the housing, and the first end of the drive shaft is fixedly connected to the diaphragm.

[0011] Two terminals are fixedly installed inside the housing, and the terminals are connected to a signal processing module via cables;

[0012] A shape memory alloy wire is connected at both ends to two terminals, and the second end of the drive shaft is connected to the middle section of the shape memory alloy wire. The medium flows in through the guide hole and squeezes the diaphragm, which can move the drive shaft away from the guide hole to stretch the shape memory alloy wire, so that the resistance of the shape memory alloy wire between the two terminals changes linearly with the strain. The signal processing module calculates the water level height based on the change in resistance value.

[0013] In some embodiments, the shape memory alloy wire is made of a nickel-titanium alloy material having an amorphous and nanocrystalline multiphase structure.

[0014] In some embodiments, a support frame is fixedly installed inside the housing, the drive shaft is slidably connected to the support frame, a roller is rotatably installed on the drive shaft away from the diaphragm end, two winding wheels are rotatably installed on the support frame near the diaphragm side, the terminal is fixedly installed on the support frame, the line connecting the two terminals and the two winding wheels is rectangular, the two ends of the shape memory alloy wire are respectively fixed on the terminal, and the shape memory alloy wire is arranged in an M-shape around the two winding wheels and the roller.

[0015] In some embodiments, the housing includes an installation cylinder, a cavity sealing cover, and a medium guide cover that are fixedly connected in sequence. The support frame is disposed inside the installation cylinder and fixedly connected to the cavity sealing cover. The cavity sealing cover is provided with a sliding hole for the drive shaft to pass through. The guide hole is disposed on the medium guide cover. The medium guide cover and the cavity sealing cover are fixedly connected to clamp and fix the diaphragm between the medium guide cover and the cavity sealing cover.

[0016] In some embodiments, a connecting flange is fixedly provided at the first end of the mounting cylinder, the cavity sealing cover is fixedly connected to the connecting flange, and a connection port for cable passage is provided at the second end of the mounting cylinder.

[0017] In some embodiments, the cavity sealing cover is provided with a tapered hole coaxially arranged with the sliding hole, the large-diameter end of the tapered hole is located away from the sliding hole, and the diaphragm is provided with an embedding part that can cooperate with the inner peripheral wall of the tapered hole and a drive shaft embedding groove that cooperates with the drive shaft. The embedding part and the drive shaft embedding groove are provided to make the diaphragm M-shaped.

[0018] In some embodiments, O-rings are fixedly installed between the connecting flange and the cavity sealing cover, and between the cavity sealing cover and the medium guide cover.

[0019] In some embodiments, a support frame is fixedly installed inside the housing, the drive shaft is slidably connected to the support frame, a roller is rotatably installed on the drive shaft away from the diaphragm end, two terminals are installed on the support frame near the diaphragm side, the two ends of the shape memory alloy wire are respectively fixed on the terminals, and the shape memory alloy wire is arranged in a V-shape around the roller.

[0020] The beneficial effects of this utility model are as follows:

[0021] 1. Water pressure is applied to the diaphragm, causing it to deform and drive the drive shaft, which in turn linearly stretches the shape memory alloy wire. The resistance value of the shape memory alloy wire changes linearly with the tensile strain. By measuring the resistance value, the signal processing module can calculate the initial water level height that caused the deformation, thus possessing high sensitivity and real-time performance, enabling automated continuous monitoring and intelligent control of the water level.

[0022] 2. The tensile element uses shape memory alloy material, which greatly simplifies the device structure and reduces the failure rate and cost. Compared with traditional sensors that use springs as tensile elements, the amorphous and nanocrystalline structure of shape memory alloy material ensures long-term stability, with no performance degradation after 2000 repeated cycles, making it better suited for harsh construction environments;

[0023] 3. The shape memory alloy wire is made of nickel-titanium shape memory alloy material. Its low temperature coefficient resistance characteristics can effectively reduce the influence of ambient temperature and improve measurement accuracy.

[0024] 4. By using an M-shape to wind the shape memory alloy wire around the winding wheel and roller, a longer wire can be obtained within a limited space, resulting in higher resistance, greater fluctuation during stretching, and higher accuracy in data acquisition. Furthermore, connecting two terminals with a single shape memory alloy wire ensures uniform stress distribution across the wire, thus improving the accuracy of test results.

[0025] 5. The modular design supports quick disassembly and flexible turnover. The equipment is waterproof and durable, making it suitable for long-term deployment.

[0026] Other advantages, objectives, and features of this invention will be set forth in the following description and will be apparent to those skilled in the art to some extent, or may be learned by practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0027] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration:

[0028] Figure 1 This is a cross-sectional view of the water level detection device according to an embodiment of the present invention;

[0029] Figure 2 This is a cross-sectional view of the diaphragm mounting structure according to an embodiment of the present invention.

[0030] The following labels are shown in the attached diagram:

[0031] Housing 100, flow guide hole 101, diaphragm 102, embedded part 1021, drive shaft embedded groove 1022, mounting cylinder 103, connecting flange 1031, connecting port 1032, cavity sealing cover 104, sliding hole 1041, tapered hole 1042, medium flow guide cover 105, O-ring seal 106, drive shaft 200, roller 201, shape memory alloy wire 300, terminal 301, cable 400, support frame 500, winding wheel 501. Detailed Implementation

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0033] To keep the drawings concise, each figure only schematically shows the parts relevant to the utility model, and these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0034] It should also be understood in some embodiments that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0035] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] like Figures 1-2 As shown, this utility model provides a water level detection device based on shape memory alloy material, including: a housing 100, with a flow guide hole 101 communicating with the outside, the flow guide hole 101 being used for medium passage; a diaphragm 102 made of silicone rubber fixedly installed inside the housing 100, the diaphragm 102 being able to close the flow guide hole 101; a drive shaft 200 slidably connected to the housing 100, the drive shaft 200 being fixedly connected to the diaphragm 102, the fixing method being: a connecting hole is provided on the diaphragm 102, a threaded hole is provided inside the drive shaft 202, and a bolt is used to fix it by threaded engagement between the connecting hole and the threaded hole; when the medium enters the flow guide hole 101, it can squeeze the diaphragm 102 to move the drive shaft 200; a shape memory alloy wire 300 is connected to the end of the drive shaft 200 away from the diaphragm 102, and a terminal 301 is fixedly connected to the other end of the shape memory alloy wire 300, the terminal 301 being connected to a signal processing module through a cable 400.

[0038] In this scheme, during water level detection, the medium (water) acts on the silicone rubber diaphragm 102, causing the diaphragm 102 to deform. This causes the drive shaft 200 to move, stretching the shape memory alloy wire 300. The shape memory alloy wire 300 is made of nickel-titanium shape memory alloy (NiTi SMA) material, possessing an amorphous and nanocrystalline multiphase structure. This allows the stress-strain of the shape memory alloy wire 300 to change linearly, while the stress-strain of conventional Ni-Ti alloys, which do not possess an amorphous and nanocrystalline multiphase structure, changes non-linearly. During the stretching process, the shape memory alloy wire 300 causes a change in the resistance of the terminal 301, where the resistance changes linearly with strain. By detecting the resistance change through a signal processing module, the water level height can be calculated to achieve water level detection. It is worth noting that the shape memory alloy wire 300 can also be made of other materials with linearly related resistance, such as nickel-free high-entropy shape memory alloys, iron-based shape memory alloys, and NiTi-Nb nanowire composites.

[0039] In one embodiment of this utility model, a support frame 500 is fixedly installed inside the housing 100, and a drive shaft 200 is slidably connected to the support frame 500. A roller 201 is rotatably installed on the end of the drive shaft 200 away from the diaphragm 102. Two winding wheels 501 are rotatably installed on the support frame 500 near the diaphragm 102. Two terminals 301 are fixedly installed on the support frame 500 and the side away from the diaphragm 102. The line connecting the two terminals 301 and the two winding wheels 501 forms a rectangle. The two ends of the shape memory alloy wire 300 are respectively fixed on the terminals 301, and the shape memory alloy wire 300 is arranged in an M-shape around the two winding wheels 501 and the roller 201.

[0040] In this scheme, by setting the shape memory alloy wire 300 to an M-shape by wrapping it around the winding wheel 501 and roller 201, a longer wire can be obtained within a limited space, resulting in higher resistance, greater fluctuation during stretching, and higher accuracy of data acquisition. Furthermore, by connecting two terminals 301 with a single shape memory alloy wire 300, the force distribution on the single wire is made uniform, thereby improving the accuracy of test results.

[0041] In a modified embodiment, a support frame 500 is fixedly installed inside the housing 100. A drive shaft 200 is slidably connected to the support frame 500. A roller 201 is rotatably mounted on the end of the drive shaft 200 away from the diaphragm 102. Two terminals 301 are installed on the support frame 500 near the diaphragm 102. The two ends of the shape memory alloy wire 300 are respectively fixed to the terminals 301, and the shape memory alloy wire 300 is arranged in a V-shape around the roller 201. That is, at this time, the terminals 301 are located at the position of the winding wheel 501 in the above embodiment and fix the two ends of the shape memory alloy wire 300. The roller 201 is located at the apex of the shape memory alloy wire 300 and connected to the drive shaft 200. The drive shaft 200 slides and drives the shape memory alloy wire 300 to be stretched outward from its apex. It is worth noting that the shape memory alloy wire 300 can also be in a Z-shaped or other bent shape with vertices. This application will not elaborate further on this, as long as the second end of the drive shaft 200 can abut against the vertices of the shape memory alloy wire 300, and the movement of the drive shaft 200 can drive the shape memory alloy wire 300 to be stretched outwards from its vertices. Even in special cases, the shape memory alloy wire 300 can be set straight, with the movement of the drive shaft 200 driving the shape memory alloy wire 300 to bend and stretch. These are all variations of this application, and this application will not further limit them.

[0042] In one embodiment of this utility model, the housing 100 includes a mounting cylinder 103, a cavity sealing cover 104, and a medium guiding cover 105, wherein,

[0043] A connecting flange 1031 is fixedly provided at the first end of the mounting cylinder 103, and a connecting port 1032 for the cable 400 to pass through is provided at the other end of the mounting cylinder 103.

[0044] The cavity sealing cover 104 is fixedly connected to the connecting flange 1031 by bolts. The support frame 500 is fixedly connected to the cavity sealing cover 104. The diaphragm 102 is fixedly installed on the cavity sealing cover 104. The cavity sealing cover 104 is provided with a sliding hole 1041 for the drive shaft 200 to pass through. The first end of the drive shaft 200 abuts against the diaphragm 102, and the second end of the drive shaft 200 extends into the mounting cylinder 103 and is connected to the shape memory alloy wire 300.

[0045] The medium guide cover 105 is fixedly connected to the cavity sealing cover 104 on the side away from the mounting cylinder 103. The guide hole 101 is provided on the medium guide cover 105. The medium guide cover 105 and the cavity sealing cover 104 are fixedly connected to clamp and fix the diaphragm 102 between the medium guide cover 105 and the cavity sealing cover 104.

[0046] In this design, the housing 100 is designed to be detachable, which facilitates the replacement of the diaphragm 102. O-rings 106 are fixedly installed between the connecting flange 1031 and the cavity sealing cover 104, and between the cavity sealing cover 104 and the medium guide cover 105, to improve the sealing performance of the housing 100.

[0047] In one embodiment of this utility model, the cavity sealing cover 104 is provided with a tapered hole 1042 coaxially arranged with the sliding hole 1041, wherein the large diameter end of the tapered hole 1042 is disposed away from the sliding hole 1041. The diaphragm 102 is provided with an embedding part 1021 that can cooperate with the inner peripheral wall of the tapered hole 1042 and a drive shaft embedding groove 1022 that cooperates with the drive shaft 200. The embedding part 1021 and the drive shaft embedding groove 1022 are arranged to make the diaphragm 102 M-shaped. When installing the diaphragm 102, the embedding part 1021 needs to be placed in the tapered hole 1042 to limit the radial displacement of the diaphragm 102. Then, the medium guide cover 105 is fixed to the cavity sealing cover 104 to limit the axial displacement of the diaphragm 102 and fix the diaphragm 102.

[0048] In this design, the M-shaped diaphragm 102 provides pre-support for the diaphragm 102 during installation. Furthermore, the M-shaped diaphragm 102 cooperates with the tapered hole 1042 to provide space for the deformation of the diaphragm 102 when the medium enters the extrusion diaphragm 102 through the guide hole 101.

[0049] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this utility model. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A water level detection device based on shape memory alloy material, characterized in that, include: The housing has a flow guide hole that communicates with the outside world, and the flow guide hole is used for the passage of medium; The diaphragm is fixedly installed inside the housing and the flow guide hole is sealed. A drive shaft is slidably installed inside the housing, and the first end of the drive shaft is fixedly connected to the diaphragm. Two terminals are fixedly installed inside the housing, and the terminals are connected to a signal processing module via cables; A shape memory alloy wire is connected at both ends to two terminals, and the second end of the drive shaft is connected to the middle section of the shape memory alloy wire. The medium flows in through the guide hole and squeezes the diaphragm, which can move the drive shaft away from the guide hole to stretch the shape memory alloy wire, so that the resistance of the shape memory alloy wire between the two terminals changes linearly with the strain. The signal processing module calculates the water level height based on the change in resistance value.

2. The water level detection device based on shape memory alloy material according to claim 1, characterized in that, The shape memory alloy wire is made of nickel-titanium alloy material with an amorphous and nanocrystalline multiphase structure.

3. The water level detection device based on shape memory alloy material according to claim 2, characterized in that, A support frame is fixedly installed inside the housing. The drive shaft is slidably connected to the support frame. A roller is rotatably installed on the drive shaft away from the diaphragm end. Two winding wheels are rotatably installed on the support frame near the diaphragm side. The terminal is fixedly installed on the support frame. The line connecting the two terminals and the two winding wheels is rectangular. The two ends of the shape memory alloy wire are respectively fixed on the terminal, and the shape memory alloy wire is arranged in an M-shape around the two winding wheels and the roller.

4. The water level detection device based on shape memory alloy material according to claim 3, characterized in that, The housing includes an installation cylinder, a cavity sealing cover, and a medium guide cover that are fixedly connected in sequence. The support frame is disposed inside the installation cylinder and fixedly connected to the cavity sealing cover. The cavity sealing cover is provided with a sliding hole for the drive shaft to pass through. The guide hole is disposed on the medium guide cover. The medium guide cover and the cavity sealing cover are fixedly connected to clamp and fix the diaphragm between the medium guide cover and the cavity sealing cover.

5. The water level detection device based on shape memory alloy material according to claim 4, characterized in that, The first end of the mounting cylinder is fixedly provided with a connecting flange, the cavity sealing cover is fixedly connected to the connecting flange, and the second end of the mounting cylinder is provided with a connection port for cable passage.

6. The water level detection device based on shape memory alloy material according to claim 4, characterized in that, The cavity sealing cover is provided with a tapered hole coaxial with the sliding hole. The large diameter end of the tapered hole is located away from the sliding hole. The diaphragm is provided with an embedding part that can cooperate with the inner peripheral wall of the tapered hole and a drive shaft embedding groove that cooperates with the drive shaft. The embedding part and the drive shaft embedding groove are provided to make the diaphragm M-shaped.

7. The water level detection device based on shape memory alloy material according to claim 5, characterized in that, O-rings are fixedly installed between the connecting flange and the cavity sealing cover, as well as between the cavity sealing cover and the medium guide cover.

8. The water level detection device based on shape memory alloy material according to claim 2, characterized in that, A support frame is fixedly installed inside the housing. The drive shaft is slidably connected to the support frame. A roller is rotatably installed on the drive shaft away from the diaphragm end. Two terminals are installed on the support frame near the diaphragm side. The two ends of the shape memory alloy wire are respectively fixed on the terminals, and the shape memory alloy wire is arranged in a V-shape around the roller.

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