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In-depth Analysis: New Developments of Chinese Solenoid Core Material Technology

As an actuator for automated meters, solenoid valve iron core material has increased rapidly in recent years. This paper analyzes the main characteristics of the electromagnetic valve core material, and focuses on the perspective of the application of the domestic development of mature technology, a brief summary of the refinement, intelligence, generalization, specialization direction was investigated, and slightly impact The social factors of the development of electromagnetic valve core material technology are discussed.
First, the main characteristics of the electromagnetic valve core material
(1) External leakage is blocked, internal leakage is easy to control, and safety is used. Internal and external leaks are elements that endanger safety. Other self-controlled valves usually extend the valve stem and the spool, which is controlled by the electric, pneumatic and hydraulic actuators, can rotate or move. This must solve the problem of external leakage of the valve stem dynamic seal during long-term operation. Only the core material of the electromagnetic valve is completed by the electromagnetic force acting on the core sealed in the magnetic isolation sleeve, and there is no dynamic seal, so the external leakage is easy to block. . Electric valve torque control is not easy, easy to produce internal leakage, and even pull off the stem head; electromagnetic valve core material structure type is easy to control the internal leakage until it is reduced to zero. Therefore, the solenoid valve core material is particularly safe to use, especially for corrosive, toxic or high temperature medium.
(2) The system is simple, then it is connected to the computer, the price is low and modest. The solenoid valve core material itself has a simple structure and a low price, and is easier to install and maintain than other types of actuators such as regulating valves. What is even more remarkable is that the automatic control system that is composed of them is much simpler and the price is much lower. Because the solenoid valve core material is a switch signal control, it is very convenient to connect with an industrial control computer. In today's era of widespread computer use, the price of electromagnetic valve iron core material has become even more pronounced.
(3) Action express, small power, light weight. Solenoid valve core material response time can be as short as a few milliseconds, even if the pilot solenoid valve core material can be controlled within tens of milliseconds. Because of self-looping, it reacts more sensitively than other self-controlled valves. Well-designed solenoid valve core material coil power consumption is very low, is an energy-saving product; can also be achieved simply trigger action, automatically maintain the valve position, usually no power at a time. The electromagnetic valve iron core material has a small external dimension, which saves space and is light and beautiful.
(4) The adjustment accuracy is limited and the applicable medium is limited. Solenoid valve iron core material usually only two kinds of switch state, the valve core can only be in two extreme positions, can not be continuously adjusted, (a lot of new ideas trying to break through, but still in the experimental trial phase) so the adjustment accuracy is also subject to certain restrictions .
Solenoid valve iron core material has higher requirements on the cleanliness of the medium, and the granular medium can not be applied. If it is an impurity, it must be filtered first. In addition, viscous media cannot be used, and the specific product is suitable for a relatively narrow range of media viscosity.
(5) Models are diverse and widely used. Although the solenoid valve core material is congenitally deficient, the advantages are still very prominent, so it is designed into a variety of products to meet a variety of different needs, the use of a very wide range. The advances in the technology of core materials for solenoid valves are also centered around how to overcome congenital deficiencies and how to better utilize their inherent advantages.
Second, the development of electromagnetic valve core material technology more electromagnetic valve core material technology
2.1. The development of refinement and simplification To the essence must be simple, only simple can be long-term spread. This is also the permanent pursuit of scientists and engineers.
(1) Simplified control loops In the past, actuators used a large number of pneumatic and electric control loops, which increased the complexity of the system, while the pilot-type solenoid valve core material formed a control loop using the working medium itself in the valve. For simplicity. In the past, many technical parameters of electromagnetic valve iron core materials at home and abroad were also limited. Now the diameter of the core material of electromagnetic valve in China has been extended to 30Omm; the medium temperature is as low as -200 °C and as high as 450 °C; the working pressure is from vacuum to 25MPa. . Action time from ten seconds to a few milliseconds. The new development of these technologies can completely replace the original large and expensive two-position fast cut-off valve and pneumatic switch valve. The electric switch valve can also partially replace continuously adjusted pneumatic and electric control valves. (How can we better meet the adjustment accuracy requirements, also mentioned below). Foreign industries such as textile, light industry, and urban construction have switched to electromagnetic valve iron core materials in large numbers, while metallurgy and chemical industries have taken the lead in using more and more electromagnetic valve iron core materials in auxiliary systems. Domestic self-controlled professional and technical personnel have increasingly paid attention to the electromagnetic valve core material.
(2) Simplified piping system When the automatic control valve is working, some auxiliary valves and fittings must be used on the piping. For example, the isolation bypass shown in FIG. 1 is a typical installation method and three manual valves are required. The manual valve 1 is a bypass valve and is manually replaced. The manual valves 2 and 3 are isolating valves to ensure online maintenance of the automatic control valve 5 . Of course, two three-way 4 and live connectors 6 are also required. This piping system occupies a large space, is time consuming to install and leaks easily. The ZDF series multi-function solenoid valve iron core material skillfully eliminates the need for these additional accessories to still have an isolated bypass and won the Geneva International New Technology Gold Award. A filter must be installed in front of the automatic control valve. The use of multiple self-control valves in combination also often requires the installation of check valves to prevent interference between pipes. Now, one-way solenoid valve core materials, combined solenoid valve core materials, and filtered solenoid valve core materials have all played a role in simplifying piping.
(3) Simplified valve structure and process Solenoid valve core material is a simple automatic control valve with a simple principle and structure, but it needs to be further simplified. The solenoid valve iron core material of household appliances industry washing machines and refrigerators is suitable for mass production in the structure and process of its parts and components. Ordinary electromagnetic valve core material coil components have been used plastic packaging to reduce the failure of lead wire breakage, while easy to achieve waterproof, explosion-proof and other protection requirements. Valve body, valve cover and other components have been used precision casting, forging and other processes, engineering plastic solenoid valve core material has also been listed on the market. The explosion-proof electromagnetic valve iron core material in China is not only a flameproof type, but also a sealed type and intrinsically safe type. High-pressure and high-temperature solenoid valve iron core materials also appear to simplify the structure and process.
2.2, the development of intelligent direction This mainly refers to the electromagnetic valve core material how to better match with the smart meter to improve the control accuracy and reliability of the system. It is generally believed that the position adjustment is difficult to achieve very high precision, but in many occasions the proper method can be used to achieve the required high precision, which greatly saves the cost. More electromagnetic valve core material technology
(1) Double combined electromagnetic valve core material. This is a combination of different sizes of solenoid valve core material. The use of a large number of dispensers on the oil measurement accuracy of up to 0.02%, are used dual solenoid valve iron core material. The large valve opens, allowing the refueling to be nearly completed within a short period of time; then the large valve is closed and the small valve is added to ensure the flow accuracy. This technology has been applied abroad for many years. The products are manufactured by ASCO Honeywell, a world-renowned company specializing in electromagnetic valve core materials. Now the company's production of dual solenoid valve iron core material has reached the target of imported products, as well as unique performance. By the way, it is pointed out that the measurement of large flow in domestic oil depots is still introducing or mimicking multi-stage shut-off valves with complicated structure and unstable performance in foreign countries. This kind of product is not manufactured by a world-famous professional company, because the market demand is not enough to attract them. interest. In fact, our oil depot will use domestically produced large-flow double manifold valves, and the effect will be much better. Double combination valve is also commonly used to control temperature, pressure, level and other parameters. The large valve guarantees the basic amount and the small valve provides the compensation amount. In systems with relatively stable parameters, this type of bit control can be quite accurate. For systems with large changes in parameters, the rate of change is still subject to certain constraints. For example, temperature control systems are still affected by thermal inertia. Therefore, a properly-operated double combined valve can significantly reduce costs relative to the control valve under the premise of satisfying control requirements.
(2) Three-position solenoid valve core material and digital valve Three-position solenoid valve core material The spool has three working positions, usually no power, in the slightly-open state, the valve provides the initial flow; to an electrical signal, solenoid valve The core material is fully open, providing a large flow; to another kind of electrical signal, the valve closes the valve.

The valve is also equipped with a manual device, so that it does not require power consumption when the valve is closed for a long period of time. The three-position solenoid valve core material can be regarded as a more compact double solenoid valve core material. It is very convenient to achieve three-position adjustment and has been used in many applications. ZDF multi-function solenoid valve core material The further idea is that n size to a certain proportion of the electromagnetic valve core material composition of 2n kinds of flow, similar to digital circuits, said this combination valve is a digital valve. Actually, two different sizes of double valves or three-position valves can generate 24=16 or 32=9 flows, which can already achieve very high accuracy. In principle, it has the advantage of supporting industrial control computers. However, due to the fact that there has not been a large number of applications in the application field, this technology is still in an experimental stage.
(3) Self-retaining solenoid valve core material Self-retaining solenoid valve core material is just a momentary power to complete the valve switching action, the spool position without electricity to maintain. Its advantage lies in energy conservation, especially when the battery is used as a power source, and the temperature rise may not be taken into account, so that the coil has a long service life and a high degree of safety in high and low temperature and explosion-proof applications. Mechanical holding and permanent magnets are common, and they are divided into double coils and single coils. The single-coil magnetic holding structure is the simplest. It is to change the polarity of the DC power supply to correspond to the two states of the valve switch. This kind of solenoid valve core material separately installed coil external wiring needs to add the conversion switch, but with the intelligent instrument is very convenient. The magnetic core material of the electromagnetic valve equipped with the IC card pre-paid gas meter and water meter is one of the keys to the success or failure of the instrument. The self-maintaining technology is an important factor in the success or failure of the electromagnetic valve core material. The domestic self-sustaining electromagnetic technology has become increasingly mature. , The company has provided support for a number of smart watch factory.
2.3. Development in the generalization direction The electromagnetic valve iron core material has a wide range of applications, but the use of the material is very different, and enhance the general performance to reduce the manufacturing, purchase and sale, storage, installation, maintenance costs, in recent years this has taken a big step .
(1) Adjustable response time The time from when the electrical signal is sent to the completion of the spool is called the response time. Different occasions want different switching speeds, there are four combinations: fast opening and fast closing - for rapid reaction system; fast opening and slow closing - for preventing water hammer; slow opening and closing - for slow Kai-off; slow opening and slow closing for a smooth transition. ZDF multi-function solenoid valve core material can be adjusted to any state, application is very flexible.
(2) Expansion medium is suitable for application. Solenoid valve core material differs from other self-control valves in that the range of application of medium viscosity is narrow, so the air, water, steam, and oil media have different structural parameters for the pilot-operated solenoid valve core material; in general, it cannot be universal. . The ZDF multi-function solenoid valve core material uses only a small screw, but it has achieved universal gas, water, oil, but also greatly widens the viscosity of the oil, which is very popular.
(3) The opening degree can be adjusted to the dynamic kiln The solenoid valve iron core material often uses the manual function when it is used, and is used as a power outage or failure. More solenoid valve core material technology Manually operated devices can only be manually opened or closed manually, and both are fully manual. The manual device can also preset the valve opening. Generally, the manual can only preset the maximum or minimum opening of the valve, and the full manual can preset the maximum or minimum opening respectively. ZDF multi-function solenoid valve core material is completely manual. Other models of solenoid valve iron core material can be equipped with simple manual devices as required.
2.4 Development in the direction of specialization In recent years, the sales volume of electromagnetic valve iron core material has surpassed the control valve, and the demand for iron core materials of various special electromagnetic valves has increased dramatically. The following describes the media types:
(1) Gas solenoid valve iron core materials Due to the adjustment of China's fuel structure, the proportion of gaseous fuels continues to increase, and the demand for gas solenoid valve iron core materials also continues to increase. Natural gas, industrial gas, city gas, liquefied petroleum gas, etc., have many different kinds of gas, including various impurities and corrosion, and the valve requirements are also different. Moreover, the pressure levels vary greatly, compressing natural gas as high as 21 to 25Mpa, and gas pressure as low as 2Kpa. Each of our country has mature products. The company's CE series of gas solenoid valve core materials have been exported to the European Union. It is worth mentioning that dual-fuel vehicles are continuously promoted in China with the soundness of environmental protection regulations. Twelve cities have already converted tens of thousands of vehicles. Nowadays, more than one set of imported fuel supply devices are used, among which are solenoid valve iron core materials. Also with the import of matching. In fact, these electromagnetic valve iron core materials are not produced by foreign companies specializing in electromagnetic valve iron core materials, and the performance test results do not fully comply with the relevant technical standards of China's gas industry. The company already has a more reliable and cheap dedicated solenoid valve core material, is gradually replacing the imported solenoid valve core material.
(2) steam valve core material iron core material steam solenoid valve first to solve the problem of high temperature, the sealing material, conductive and magnetic materials must be particularly selected. The corrosion of steam pipes is severe and must be taken seriously. More importantly, there is a lot of condensate in the steam pipe after the factory is off duty, and the solenoid valve core material needs to be able to operate reliably when the gas and liquid fluids pass through. The factory inspection has many strict procedures. The company's ZQDF-3 electromagnetic valve iron core material was listed as a national-level new product for 92 years. It has been tested by users and in recent years it has also introduced the CC series steam core valve core material.
(3) Water solenoid valve core material Water solenoid valve iron core material is always regarded as the simplest. In reality, water is divided into tap water, industrial pure water, industrial wastewater, irrigation water, seawater, and other types of corrosion. The performance and cleanliness are different. Different solenoid core materials should be selected.
Although the tap valve is the most common, the different applications have different requirements for the performance of the valve. For example, fire-fighting electromagnetic valve iron core material, the reliability of the operation is critical, in case of disastrous consequences can be disastrous. Even if an ordinary manual valve does not open and close for a long period of time, it is difficult to open it quickly. In recent years, high-rise buildings have mushroomed, and China's fire-fighting solenoid valve core material technology has also matured. Another example, the waterworks need to use the electromagnetic valve iron core material for the inverted siphon pipeline, but this kind of solenoid valve core material must work under vacuum in the state of pressure, and must work reliably, must not have inner leakage, but also in the water In the case of low cleanliness, it should still be flexible. The company's special electromagnetic valve core material for water plants has been applied in hundreds of water plants throughout the country. It is listed as the only recommended solenoid valve core material by China Water Association. In addition, the electromagnetic core material of the sprinkler solenoid valve is gradually applied along with the development of China's agriculture and gardening industry.
(4) Solenoid valve oil core material for oil There are a wide variety of oils and seal technology is one of the keys. Oil-resistant rubber is just a category name. Different oils and even impurities in the same kind of oil require different oil-resistant rubbers. For example, leaded gasoline is not necessarily resistant to unleaded gasoline. In recent years, with the increase in the sales volume of special electromagnetic valve core materials, the lifespan of special oil-resistant rubber has also been increasing. The viscosity of the oil varies greatly, and electromagnetic valve core materials with different structures must be used. High-viscosity oils also often circulate at high temperatures, so electromagnetic valve iron core materials also have to solve the problem of high temperature resistance. For fuel oil also need to meet the explosion-proof requirements. In recent years, the company has successively introduced various special solenoid valve iron core materials such as gasoline, diesel, and heavy oil, which have been widely used.
(5) Solenoid valve core material for air conditioning

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