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Application of pressure sensor in non-negative pressure water supply system

Application of pressure sensor in non-negative pressure water supply system

2016-10-21

At present, in order to eliminate the impact on residential water use in urban water supply, the relevant urban water supply regulations drafted by my country stipulate that it is not allowed to install domestic and production water pumps directly on the municipal pipeline network. Resident water supply equipment is connected in series to the municipal water supply pipe network, and a non-negative pressure water supply system is required. A flow controller and a sub-cavity stabilized pressure compensation tank should be added between the pump inlet and the municipal pipe network. The flow controller constantly monitors the municipal pipes. Net pressure. While ensuring that the municipal pipe network does not produce negative pressure, it can also make full use of the original pressure of the municipal pipe network.   　　The non-negative pressure water supply system detects the pressure change of the water supply pipe network when the water consumption changes through the high-sensitivity pressure sensor or pressure switch installed on the water supply pipe network, and continuously transmits the changed signal to the microcomputer. According to different operating conditions, the compensation amount is dynamically controlled to achieve dynamic pressure balance and ensure a constant pressure in the water supply pipe network to meet the water needs of users. When municipal piped tap water enters the regulating tank at a certain pressure, the air in the pressure stabilizing compensation tank is discharged from the vacuum eliminator, and the vacuum eliminator is automatically closed after the water is full. When the tap water can meet the water pressure and water volume requirements, the water supply equipment directly supplies water to the water pipe network through the bypass check valve; when the pressure of the tap water pipe network cannot meet the water requirements, the system will pass the pressure sensor, or the pressure switch, the electricity The contact pressure gauge gives the pump signal to start the pump operation.     　　In addition, when the water is supplied by the pump, if the water volume of the tap water pipe network is greater than the pump flow rate, the system maintains normal water supply. During the peak period of water use, if the water volume of the tap water pipe network is less than the pump flow rate, the water in the regulating tank can still be used as a supplementary water source to supply water normally. At this time, the air enters the regulating tank from the vacuum eliminator, which eliminates the negative pressure of the tap water pipe network. After the peak period of water use, the system returns to its normal state. If the tap water supply is insufficient or the water supply of the pipe network is stopped, which causes the water level in the regulating tank to drop continuously, the liquid level controller will give a water pump shutdown signal to protect the water pump unit. This process circulates in this way, and finally achieves the purpose of water supply without negative pressure.

21

2016

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10

China's key sensors for reconnaissance unmanned vehicles need to be imported and localized in 3-5 years

China's key sensors for reconnaissance unmanned vehicles need to be imported and localized in 3-5 years

2016-10-21

On October 17, the finals of the "Over Dangers 2016" Ground Unmanned System Challenge held by the Chinese Army Equipment Department was held in Beijing. Tang Jin, deputy director of the Scientific Research Ordering Bureau of the Army Armament Department, stated at the final press conference that unmanned technology has broad application prospects in the military field and will profoundly change the shape and style of future wars. In layman's terms, people expect that unmanned systems can complete some high-risk tasks or tasks that humans cannot complete in non-war military operations such as war or rescue and disaster relief.   　　Tang Jin said that this competition represents the highest level of unmanned technology in China in terms of scale and subject difficulty. According to the reporter's understanding, a total of 22 teams stood out from 73 teams from all over the country and advanced to the finals. Their scientific research strength is at the leading level in China. Therefore, industry leaders who come to participate and watch the competition have a considerable say in the development status of unmanned systems and the prospects of their application in future military operations.   　　Modeling the unknown environment is a worldwide problem 　　The guest, Deng Zongquan, vice president of Harbin Institute of Technology, was one of the earliest scholars engaged in lunar rover research. In his view, unmanned systems still have a long way to go before they become tools on the battlefield. 　　Wu Tao, an associate professor at the National University of Defense Technology, interprets the development status of unmanned systems in a popular way as "it can be applied in a known environment, but cannot be modeled in an unknown environment." In this research field, the adaptability of unmanned systems to unstructured environments is a recognized problem, that is, how to improve the adaptability of unmanned systems to unknown environments. 　　In the competition, Professor Xu Youchun from the Military Transportation Academy led the "Mengshi Intelligent No. 1" team to take the lead in the field battlefield reconnaissance category A and B competitions. In fact, this car not only performed well in this competition, but its previous generations of principle prototypes have already won 3 championships and 3 runner-ups in the "China Smart Car Future Challenge". 　　Xu Youchun told a reporter from China Youth Daily and China Youth Online that “every cross-country road that can be driven by humans can basically be walked”, and the “Fierce Lion” also has a “walking” function, that is, it can also be used when GPS positioning and navigation are temporarily lost. "Try to find your way" yourself.But in general, the "Fierce Lion" is still in the cub stage, and can only complete the set tasks in the known environment, and does not have the corresponding adaptive ability to the unknown environment.        For example, if the reconnaissance target is set as an oil barrel, Xu Youchun and his teammates can take hundreds of images of oil barrels with different shapes, positions, and lighting conditions, etc., and save them in the system for comparison and recognition by the "Fierce Lion". By designing a fixed route and procedures for how to overcome known obstacles, the "Fierce Lion" can basically complete the task successfully. But the reality is that people cannot predict all the routes and obstacles in the area to be surveyed. 　　This is not only a problem facing Xu Youchun's team, but the world's unmanned technology research field is facing the dilemma that it cannot model the unknown environment. 　　Yang Jingyu, a professor at Nanjing University of Science and Technology, has been engaged in unmanned systems research for 25 years. He explained that structured environments can be simulated by non-stop modeling. For example, environmental data on highways can be measured, and machines can be collected and identified. And judgment. "Artificial intelligence has something to do with structured environments. But unstructured environments are difficult to simulate, and the world has not done a good job of modeling in unstructured environments." 　　For this reason, interviewed professionals such as Wu Tao, Deng Zongquan, and Yang Jingyu all said that from this perspective, China and the United States, the leader in unmanned technology, are not much different. They all need to strengthen theoretical design research on unstructured environments, that is, unknown environments.    　　My country's R&D strength of basic components needs to be improved 　　Specific to the current status of domestic unmanned system research and development, the main research and development forces who came to participate and watch the competition clearly saw their own advantages and shortcomings. 　　Professionals usually use three dimensions to investigate unmanned systems, including environmental perception, planning and decision-making, and low-level co

21

2016

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10

Looking at the future development trend of sensors from three application areas

Looking at the future development trend of sensors from three application areas

2016-10-18

The sensor is a detection device with a wide range of applications, such as industrial automation, agricultural modernization, aerospace technology, military engineering, robotics, environmental monitoring, security, medical diagnosis, transportation, household appliances, etc. It can feel the measured Information, and can transform the sensed information into electrical signals or other required forms of information output according to certain rules to meet the requirements of information transmission, processing, storage, display, recording, and control.   　　With the requirements of miniaturization, digitization, intelligence, multi-function, systemization, and networking, sensors are also developing in the direction of small, fast, and flexible. I love solution network predicts that sensors will be large in the following three areas in the future Shine.

18

2016

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10

The Ministry of Industry and Information Technology is formulating a sensor development plan-MEMS welcomes new opportunities

The Ministry of Industry and Information Technology is formulating a sensor development plan-MEMS welcomes new opportunities

2016-10-14

The Internet of Things (IOT), smart hardware, automotive electronics, and Industry 4.0 have brought huge market opportunities to sensors. At the "3rd Global Sensor Summit Forum and China Internet of Things Application Summit" that ended yesterday, how sensors become the "eagle" instead of the "pig" on the "outlet" has become the focus of heated discussion and attention by many participating experts. According to industry insiders, based on huge opportunities and fragmented market demand, MEMS sensors have become a new opportunity for sensor development, and platform companies focusing on serving small and medium-sized companies have begun to emerge. 　　As the most important component of the perception layer of the Internet of Things, sensors have become one of the focus of policy support. At the forum, Ding Wenwu, general manager of the National Integrated Circuit Industry Investment Fund (hereinafter referred to as the "big fund"), said that the big fund will support the development of the Internet of Things, focusing on investment in sensors, MEMS sensors and other fields. Ren Aiguang, director of the Integrated Circuit Division of the Electronics Department of the Ministry of Industry and Information Technology, revealed that the Ministry of Industry and Information Technology is formulating a sensor development plan, which will be released soon.

14

2016

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10

Application of Firstrate Pressure Sensor in Water Treatment

Application of Firstrate Pressure Sensor in Water Treatment

2016-10-14

Water is the source of life and a precious natural resource indispensable for social and economic development. However, as the world environment continues to deteriorate, freshwater resources are showing a trend of sharp decline, which severely hinders the development of the world economy. Therefore, the water treatment industry is getting more and more attention, and is constantly being promoted to carry out technological innovation and the development of the entire industry. Although the environmental protection water treatment industry in my country started relatively late, with the continuous development of the economy and the lack of attention from the government, it has developed rapidly in recent years and has a bright future.     　　In the water supply and sewage treatment process, the pressure sensor is used to provide important control and monitoring methods for system protection and quality control. The sensor design not only needs to consider its withstand extremely harsh working conditions, such as extreme temperature, mechanical shock and vibration. , But also need to be able to provide normal output conditions. For example, when the single-stage centrifugal high-speed fan is running, the oil pressure of the cooling/lubricating oil must be greater than 2.5KG/per square centimeter. If the oil pressure is lower than this value, the blower is not allowed to start. It should be pointed out that the unipolar high-speed centrifugal blower originally used the electric contact spring tube pressure gauge to measure the oil pressure and constitute the point-open interlock, but its node capacity is only 10VA, so the general pressure sensor is easy to damage and the failure rate is high. The pressure transmitter with high performance, high stability and limited setting alarm relay output function provided by the company in the product selection not only improves the damage rate of customers, but also can make early warning and alarm settings for oil pressure. Once triggered At the appropriate pressure point, there will be a pre/alarm prompt, which effectively alleviates the possibility of super-nuclear operation of the fan.   　　The pressure sensor converts the pressure (generally the pressure of a liquid or gas) into an electrical signal output. The pressure electrical signal can also be used to measure the liquid level of a static fluid, so it can be used to measure the liquid level. The sensitive components of the pressure sensor are mainly composed of a silicon cup sensor, silicone oil, isolation diaphragm and air duct. The measured medium pressure P is transmitted to one side of the silicon cup component through the isolation diaphragm and silicone oil (see right picture 1), atmospheric reference The pressure po is applied to the other side of the silicon cup element through the air duct. The silicon cup element is a cup-shaped single crystal silicon wafer with a very thin bottom. The bottom diaphragm of the cup produces elastic deformation with very small displacement under pressure P and Po. Monocrystalline silicon is an ideal elastic body, its deformation is strictly proportional to pressure, and its recovery performance is excellent. The four bridge resistors formed by the semiconductor diffusion process on the silicon diaphragm are arranged so that when the silicon diaphragm is deformed by pressure, the two resistors on the diagonal are under compressive stress, and the other two resistors are under tensile stress. Due to the piezoresistive effect of diffused silicon, the resistance of the two opposite resistors increases, and the resistance of the other two resistors decreases. If a voltage is applied to the two ends of A-A (see Figure 1), there will be a P-Po differential voltage proportional to the output voltage signal between C and D.     　　电子技术的进步同样也对压力传感器的功效产生了积极而深远的影响。近年来，这类装置在集成电子信号调节电路中通常使用现金的ASIC（特定用途集成电路）技术，这使得每个客户都可以根据自己的具体要求来调节每个产品的性能和功能，从而为在许多行的应用开辟了道路。菲尔斯特传感器有限公司运用ASIC技术制造一系列的压力传感器，这些产品用于泵站和水处理，提供多种外壳选项，防护等级高达IP65或更高，性能精确稳定。

14

2016

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10

The application of the Firstrate temperature sensor in the automobile industry

The application of the Firstrate temperature sensor in the automobile industry

2016-10-12

As we all know, the application of temperature sensors is very wide, so in the automotive industry, its assembly, what has changed?Install temperature sensors on buses to prevent spontaneous combustion 　　During the high temperature in summer, spontaneous combustion of buses often occurs. How to prevent spontaneous combustion of buses is also extremely important. In order to prevent problems before they happen, the Taiyuan City Bus Company in Shanxi has installed temperature sensors for some buses to ensure the safety of buses. 　　Generally speaking, spontaneous combustion accidents of buses are not unrelated to the long operating life of the vehicles and the aging of internal lines. In general, vehicles with a long operating life and rear-engined vehicles are prone to excessive temperature in the engine compartment and cause fires and other accidents during operation. 　　It is difficult for drivers of rear-engined vehicles to find problems such as excessive engine temperature, so installing a temperature sensor to give an alarm can play a greater role. The bus company installs temperature sensors on some buses. When the engine temperature reaches a set threshold, it will automatically alarm. The installation of temperature sensors can effectively improve various potential safety hazards of the engine, thereby ensuring the safety of driving and the personal safety of passengers. 　　New energy vehicles: energy saving and emission reduction 　　At present, "energy saving and emission reduction" is one of the main directions of global industrial development. On the one hand, it refers to the need to continue research and development of "energy saving and emission reduction" technologies for internal combustion engines; on the other hand, it refers to the need to strengthen the development of new energy vehicles. 　　The sensors used in hybrid/electric vehicles mainly include sensors for detecting battery temperature, temperature sensors for monitoring motors, and temperature sensors for battery cooling systems. The battery of a hybrid/electric vehicle can only provide the best energy output at a precisely defined operating temperature. Therefore, it is required to reliably monitor and adjust the battery temperature to prevent the battery from overheating and maximize its working life. At present, most hybrid/electric vehicle battery designs use NTC temperature sensors to measure their temperature. 　　Electric motors are another basic component of hybrid/electric vehicles. In order to ensure the long life of the motor and its best performance, the temperature of the electric motor also needs to be continuously monitored, and it is as accurate as possible to work in the temperature range above 140℃, so it is also very important to determine the temperature of the stator winding. , This is the only way that the motor can take full advantage of its advantages without the risk of overheating. In order to measure the temperature of the stator, it is also required that the sensor should be easy to install, and to ensure that the sensor is protected from mechanical pressure during installation and operation and has a high dielectric strength. The latter can prevent the driver current circuit from the measuring current circuit. Flashover phenomenon. 　　In addition, in practical applications, since the battery and driver are also important safety components of hybrid/electric vehicles, the reliability and shock resistance requirements of the sensor are also high, which requires the selection of electronic components, process and reliability verification Start with other aspects to provide the best comprehensive solution.     　　Due to the importance of sensors in electronic control systems, in a sense, the competition of advanced cars is the competition of sensors, and countries all over the world attach great importance to its theoretical research, new material application, and product development. 　　The Firstrate temperature sensor has a built-in high-performance digital circuit, which is carefully designed for the working conditions of radio frequency, electromagnetic interference, and surge voltage. It has the characteristics of strong anti-interference ability, wide power supply range, and polarity protection. It conforms to IEC, CE (EMC) ) Standard, with anti-radio frequency and electromagnetic interference. A precise conversion circuit is used to convert the resistance signal into a standard current, voltage or digital signal. 　　The Firstrate temperature sensor has an exquisite structure, the probe and connector are made of 316L stainless steel, and the shell is made of superb laser welding. The overall structure meets the IP65 standard (up to IP68), and has the characteristics of fast response, high accuracy, and long-term stability. , It is suitable for the temperature detection of liquid and gas, and meets the needs of aerospace, military industry, engineering machinery, automobile industry, air

12

2016

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10

Pressure transmitters in the paper industry play different roles at different stages

Pressure transmitters in the paper industry play different roles at different stages

2016-10-09

Pressure transmitter is a commonly used flow measuring instrument, which is widely used in various industries. In the paper industry, pressure transmitter is also one of the indispensable parts. It is almost different in the paper industry. Different types of pressure transmitters are used in the stages. The pressure transmitter is the most frequently used in the entire paper industry, so what is the role of the pressure transmitter in each of the different stages? How does it work? Next, the pressure transmitter manufacturer will come to reveal the answer to everyone!     1. The pressure transmitter is used in the material preparation section.The pressure transmitter is mainly involved in the flow measurement of refining, water and acid or alkali in the pulping process. Generally, the temperature of the slurry after mechanical grinding should reach 80°C. However, when wood or grass materials are used as raw materials for pulping, a cooking process is usually required. Since the cooking liquid is generally alkaline, the lining of the pressure transmitter is mostly high temperature resistant PTFE, and the structure is split. The electrode material must have corrosion resistance, so you need to choose carefully when choosing the electrode material.   2. The pressure transmitter is used in the screening and bleaching section.There are about five kinds of pulp (chemical pulp, deinked pulp, CTMP, mechanical pulp, and damaged liquid pulp) from each material preparation workshop into the papermaking workshop to participate in the pulping process. Here, the temperature of the machine pulp and CTMP pulp is as high as 50 to 80°C, and the pressure transmitter lining material should be PFA or PTEE preferentially.   　　In order to obtain paper of different quality, the slurry ratio can be completed by using different slurry ratio concentrations. However, if the finished product is unqualified due to the fine ultra-tolerance of a slurry, it will cause great losses to the manufacturer. Therefore, the manufacturer pays special attention to this link. Each of the pipelines participating in the proportioning is equipped with a pressure transmitter to measure the instantaneous and total flow into the slurry distribution main pipe. At the same time, the online concentration is installed at the lower end of the slurry pipe Calculated to detect the effect of slurry preparation. If there is a deviation from the expected, adjust the corresponding slurry flow by adjusting the opening of the valve. This requires high accuracy requirements for pressure transmitters, as well as good repeatability and fast dynamic response.   　　Pressure transmitters generally use PTFE or other fluoroplastic linings in the papermaking field: electrodes are selected according to the acidity and alkalinity of the liquid. When selecting electrodes or lining materials, if there is a mismatch, the sensor may not operate normally, so it is very important to select a suitable pressure transmitter in the paper industry. In addition, the factors that affect the accuracy of the sensor include dissatisfied pipes, insufficient length of straight pipes, misalignment during small-diameter installations, and so on.   　　In addition to the above-mentioned paper preparation section and screening and bleaching section as representatives, it is also necessary to select a suitable pressure transmitter from the analysis of the environment of each section, etc., in order to reduce the error of the measurement process and ensure the normal operation of the sensor. The produced paper meets the predetermined requirements.

09

2016

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10

Problems to be solved in the localization of fire pressure sensors

Problems to be solved in the localization of fire pressure sensors

2016-09-28

Fire pressure sensors are the most widely used products in modern industrial production, and they are widely used in many industries. However, a large part of the domestic demand for pressure sensors still relies on imports, especially for precision pressure measurement occasions. In the past few years, domestic manufacturers have also continued to improve their technology, product performance has been improved, and the phenomenon of uneven quality has also appeared. On the other hand, it has also led to a reduction in the price of foreign products, but they are still very expensive compared with domestic products.

28

2016

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09

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