High and low frequency dynamic and static waterproof pressure sensor

Abstract

The application discloses a high and low frequency dynamic and static waterproof pressure sensor, which comprises a liquid level cable, two sides of the liquid level cable are sequentially and hermetically connected with a test mechanism and a plug mechanism, the test mechanism comprises a strain gauge electrically connected with the liquid level cable, and the strain gauge is a structure directly receiving an external test medium. And a reinforcing body is arranged on the outer side of the strain gauge. The strain gauge is of a flat membrane structure, the reinforcing body is an elastic body attached to the outer surface of the strain gauge, and the plug mechanism comprises a waterproof plug connected with the other end of the liquid level cable and the like. The strain gauge provided by the utility model adopts a flat membrane structure, can capture an instant dynamic state, achieves the measurement of dynamic and static pressure, and solves a problem that the measurement delay of a conventional sensor affects the subsequent further research. And according to the arranged waterproof structure, lake and sea instant diving measurement can be carried out, and the application range of the sensor is widened.

Description

Technical Field

[0001] The present application relates to the technical field of pressure sensors, and in particular to a high- and low-frequency dynamic and static waterproof pressure sensor. Background Art

[0002] A pressure sensor is a device or apparatus that can sense pressure signals and convert them into usable output electrical signals according to certain rules. A pressure sensor is usually composed of a pressure sensitive element and a signal processing unit. It can measure various types of pressure, including liquid pressure, gas pressure, static pressure and dynamic pressure. Pressure sensors are widely used in various industrial automatic control environments, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military industry, petrochemicals, oil wells, electricity, ships, machine tools, pipelines and many other industries. Especially in hydraulic systems, pressure sensors are used to complete closed-loop control of force; in safety control systems, pressure sensors are also often used, such as in the safety management system of air compressors themselves.

[0003] At present, static pressure sensors are commonly used in various industries. The pressure collection structure of the pressure sensor usually has a pressure collection hole. The pressure can only be collected after the collected medium enters through the pressure collection hole. The pressure collection hole causes a certain hysteresis in the pressure collection process due to the circulation of the collected medium. The collection time is usually 200-300ms. In some collection environments where the pressure decreases over time (such as explosions), the collection hysteresis of the sensor cannot collect accurate pressure values, which affects subsequent further research; and due to the measurement hysteresis of the sensor, the pressure sensor can only measure static pressure after stabilizing the pressure, and cannot collect dynamic pressure instantly. Therefore, the current pressure sensors are insufficient in the timeliness, accuracy and dynamic pressure collection of data collection. Summary of the invention

[0004] In response to the above-mentioned problems, the present application aims to provide a high- and low-frequency dynamic and static waterproof pressure sensor, whose strain gauge adopts a flat membrane structure, which can capture instantaneous dynamics and realize the measurement of dynamic and static pressure, thereby solving the problem that the current sensor has measurement hysteresis and affects subsequent further research.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted in the present application is as follows: a high-low frequency dynamic-static waterproof pressure sensor, including a liquid level cable, characterized in that: a testing mechanism and a plug mechanism are sealed and connected on both sides of the liquid level cable in sequence, and the testing mechanism includes a strain gauge electrically connected to the liquid level cable, and the strain gauge is a structure that directly accepts external test media, and a reinforcement body is also arranged on the outside of the strain gauge.

[0006] Preferably, the strain gauge is a flat membrane structure.

[0007] Preferably, the reinforcement is an elastomer adhered to the outer surface of the strain gauge.

[0008] Preferably, the testing mechanism also includes a base connected to the elastomer, in which a wire connected to the strain gauge is passed, and a circuit board connecting the wire to the liquid level cable is embedded on the side of the base away from the elastomer, while on the other side of the base is a first shell that is detachably connected and closed to lock the liquid level cable.

[0009] Preferably, the plug mechanism includes a waterproof plug connected to the other end of the liquid level cable, and a second shell that locks the liquid level cable and the waterproof plug.

[0010] The beneficial effects of the present application are as follows: the strain gauge of the present application adopts a flat membrane structure, which can capture instantaneous dynamics and realize the measurement of dynamic and static pressure, solving the problem that the current sensor has measurement hysteresis and affects subsequent further research; and according to the set waterproof structure, instantaneous diving measurements in lakes and seas can be carried out, thereby increasing the application scope of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a diagram of the overall structure of the pressure sensor of this application.

[0012] Figure 2 For this application Figure 1 Enlarged view of the structure at point A in the middle.

[0013] Figure 3 For this application Figure 1 Enlarged view of the structure at point B.

[0014] Figure 4 This is a diagram of the waterproof structure of the base and the first shell end of the present application.

[0015] In the figure: annular groove-4a; rectangular ring-8; copper ring-9; locking cap-10; sealing ring-12. DETAILED DESCRIPTION

[0016] In order to enable ordinary technicians in the field to better understand the technical solution of the present application, the technical solution of the present application is further described below in conjunction with the accompanying drawings and embodiments.

[0017] See attached Figures 1 to 4A high-low frequency dynamic and static waterproof pressure sensor is shown, including a liquid level cable 11 (preferably a polyurethane cable), through which the circuit can be connected and the collected data can be transmitted. In order to solve the shortcomings of the current pressure sensor, the pressure sensor of the present application is sealed and connected with a test mechanism and a plug mechanism on both sides of the liquid level cable 11 in sequence, and the test mechanism includes a strain gauge 2 electrically connected to the liquid level cable 11. The strain gauge 2 is a structure that directly accepts external test media. This structure enables the strain gauge 2 to receive the measured medium in real time, thereby realizing real-time feedback of the measured pressure, solving the problem of measurement hysteresis in the current sensor, and realizing instantaneous measurement of dynamic pressure.

[0018] Since the strain gauge 2 of this structure can accept instantaneous measurement media, in order to improve its strength and enhance its durability, a reinforcement body is also provided on the outside of the strain gauge 2. The reinforcement body can effectively enhance the resistance strength of the strain gauge 2. At the same time, the two are preferably in close contact to reduce the hysteresis effect caused by the gap.

[0019] The test mechanism and the plug mechanism are connected and separated by a liquid level cable 11, such as Figure 1 As shown, the flexible structure of the liquid level cable 11 can also be used to change the test position of the test mechanism, thereby increasing the dynamic measurement range of the sensor.

[0020] Preferably, Figure 2 As shown, the strain gauge 2 is a flat membrane structure (preferably with a specification of φ6mm). The strain gauge 2 with the flat membrane structure can capture instantaneous dynamics and can effectively solve the acquisition hysteresis problem of the current conventional sensors due to the acquisition holes. In addition, the flat membrane structure has a larger acquisition contact area, which can further increase the pressure acquisition range, thereby obtaining real-time acquisition of pressure.

[0021] like Figure 2 As shown, the reinforcement is an elastic body 1 attached to the outer surface of the strain gauge 2. The elastic body is preferably 17-4H stainless steel, which has good body strength and corrosion resistance. According to the structure of the strain gauge 2, it is also made into a flat shape, and the whole is a U-shaped groove, which is used for assembly and connection with the base 4 described later. Figure 2 As shown, the elastic body 1 is flat against the strain gauge 2, thereby protecting the strain gauge 2 and reducing the hysteresis effect on the acquisition.

[0022] Specifically, Figure 2As shown, the test mechanism also includes a base 4 (preferably made of 316L material) connected to the elastic body 1, and a wire 3 (preferably a high-temperature conductive silver wire) connected to the strain gauge 2 is inserted into the base 4. The wire 3 is used to turn on the strain gauge 2 during measurement for measurement and transmission. On the side of the base 4 away from the elastic body 1, a circuit board 6 (preferably made of aviation sheet material) is embedded to connect the wire 3 to the liquid level cable 11, and an insulating pad 5 (preferably made of polytetrafluoroethylene) is also arranged between the inner side of the circuit board 6 and the base 4. The circuit board 6 is used to set and control the strain gauge circuit. On the other side of the base 4, a first shell 7 (which and the second shell 13 described below are both made of 316L material) is detachably connected to lock the liquid level cable 11. The first shell 7 and the end of the base 4 are preferably threaded and sealed. After connection, the embedded sealing protection of the circuit board 6 is realized to improve the waterproofness of the sensor.

[0023] Furthermore, a rectangular ring 8 (preferably made of nitrile) and a copper ring 9 (preferably made of red copper) are provided in the first housing 7. Since the copper ring 9 is softer than stainless steel and is easy to deform, the effect of the spacing between the rectangular ring 8 and the rectangular ring 8 is that both of them are deformed, that is, the spacing deformation, and the sealing effect will be better. A locking wire cap 10 (preferably made of 316L material) is also sealed and connected to the outer end of the first housing 7 and is sleeved on the liquid level cable 11 to lock the liquid level cable 11 with the first housing 7.

[0024] like Figure 3 As shown, the plug mechanism includes a waterproof plug 14 connected to the other end of the liquid level cable 11, through which the waterproof plug 14 can improve the waterproofness of the sensor when measuring in water. And a second housing 13 that locks the liquid level cable 11 with the waterproof plug 14, and the second housing 13 also contains the above-mentioned rectangular ring 8 and copper ring 9, as well as a locking cap that locks the other end of the liquid level cable 11 with the second housing 13.

[0025] In order to further improve the waterproof effect of the sensor, especially to avoid the problem of sensor acquisition failure caused by the circuit board 6 contacting water, it is necessary to further enhance the waterproofness between the base 4 and the first shell 7. Figure 4 As shown, an annular groove 4a is provided on the end face where the base 4 and the first shell 7 meet, and a sealing ring 12 is embedded in the annular groove and can be squeezed into contact with the end face of the first shell 7, thereby further improving the waterproofness of the circuit board 6 and ensuring the stability of the sensor when working underwater.

[0026] The principle of the present application is: the sensor sets the strain gauge 2 for collecting pressure as a flat membrane structure, through which the instantaneous dynamics can be captured, which can effectively solve the collection hysteresis problem existing in the current conventional sensors due to the collection hole, and the flat membrane structure has a large collection contact area, which can further increase the pressure collection range, thereby obtaining real-time pressure collection. The test mechanism and the plug mechanism are connected and separated by the liquid level cable 11, and the flexible structure of the liquid level cable 11 can also change the test position of the test mechanism, thereby increasing the dynamic measurement range of the sensor. And through the waterproof plug 14, the circuit board 6 is embedded, and the waterproof structure of the base 4 and the first shell 7 is set, the waterproof effect of the sensor is further improved, and the application range of the sensor is improved.

[0027] The above shows and describes the basic principles, main features and advantages of the present application. Without departing from the spirit and scope of the present application, the present application may have various changes and improvements, which fall within the scope of the present application to be protected.

Claims

1. A high-low frequency dynamic and static waterproof pressure sensor, comprising a liquid level cable (11), characterized in that: A testing mechanism and a plug mechanism are sealed and connected in sequence on both sides of the liquid level cable (11); the testing mechanism comprises a strain gauge (2) electrically connected to the liquid level cable (11); the strain gauge (2) is a structure that directly receives an external test medium; and a reinforcement body is also provided on the outside of the strain gauge (2).

2. The sensor according to claim 1, characterized in that: The strain gauge (2) is a flat membrane structure.

3. The sensor according to claim 2, characterized in that: The reinforcement body is an elastic body (1) attached to the outer surface of the strain gauge (2).

4. The sensor according to claim 3, characterized in that: The testing mechanism also includes a base (4) connected to the elastic body (1), a wire (3) connected to the strain gauge (2) is inserted into the base (4), and a circuit board (6) connecting the wire (3) and a liquid level cable (11) is embedded in the side of the base (4) away from the elastic body (1), while a first shell (7) for locking the liquid level cable (11) is detachably connected to the other side of the base (4).

5. The sensor according to claim 4, characterized in that: The plug mechanism comprises a waterproof plug (14) connected to the other end of the liquid level cable (11), and a second housing (13) for locking the liquid level cable (11) and the waterproof plug (14).

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