Smart meter developed many years now. Intelligent water meter for many years to put into use on the market the some quality technical problems. These issues are ultimately focused on the actuator. The developer of the actuator is more or less done the basic function of the experimental, to verify the reliability of its function in actual use. Why will appear in the official use of the user actuator proven unexpected problems? I think the structure design, test methods, test environment on the synthesis problem. The following valve issues elaborated my personal view. Structural design: (a) valve structure design:
The basic principle of the valve work
Types of valves on the market currently include: valve solenoid pilot valve, motor, pilot valve, motor valve, flat stack.
1), the solenoid pilot valve works: When the solenoid valve is open, the pressure chamber of the valve seal pressure relief, the water pressure inside the pipe valve sealing pushing smart meter is working properly; solenoid valve is closed, turn off the vent the hole of the pressure chamber, the valve sealed in the cavity of the hydraulic quick rise, until the valve seal pressed valve port, to close the outlet. 2), the electrical pilot valve is a deceleration mechanism, in order to solve the sealing problem of the moving member, the moving rod with the principles of the magnetic driving manipulation of the opening and closing of the relief hole, so as to achieve the open and shut of the valve seal. It is similar to the principle of solenoid pilot valve, just time and speed of response is slower than the solenoid pilot valve. The problems with the solenoid pilot valve is the same. 3), motor Ball Valve works: deceleration mechanism slows down the speed of the motor, the torque increase for the promotion of the ball rotates to open and close the function. Rotating ball valve for ball valve manufacturing process requirements are relatively high, efforts to rotate the ball valve to have a very standard parameters must be controlled in the range of a set of process parameters. Further, the sealing of the drive balls operation lever is a key, which uses the basic rubber O-ring seal, rubber ring will increase the torque is too tight, too loose will result in poor sealing and leakage. 4), the plane stack valve works: slow down the speed of the motor by deceleration mechanism, the torque increase for the promotion of planar stack valves rotate to open and close the function. The tightness is guaranteed by the water pressure poorly at. Plane stack valves on the valve plate friction plane flatness and smoothness requirements quite high, and also has a very high demand for material requirements. To solve these problems, a flat-stack valves under laminations uses a ceramic substrate, topsheet with other high strength wear-resistant material, manufacturing and processing of the completely sealed by Chemical Machinery principle, both to ensure a reasonable contact surface, and ensure that a minimum coefficient of friction.
Structure Analysis:
Solenoid pilot valves and motors pilot valve has appeared in the actual use of the water pipe, the adsorption of iron particles clogged, pressure relief valve stem caused the stem stuck through the use of market result in the pilot hole due to prolonged water quality problems feedback information, developers have to understand that the implementation of such a structure is not suitable for the current water quality use of China's Water Division. Thus, the developers turned to the ball and flat stack valves. Now use a little more of the ball valve. Following a comprehensive analysis of the structure of ball valve, flat stack valves:
1), the motor ball valve: the structure of the ball valve and improve the level of technology, the torque control of the ball valve in one does not leak and the torque in a certain range of parameters. A process request contains two requirements, first, between the clamping ring of the ball and sealing tightness, both to be held under a certain pressure when closed does not leak; also used by the outer force to rotate the torque in the range of a parameter. This parameter value should be:
F> f1 + f2 + f3 type: F - motor drive the deceleration mechanism output torque force;
f1 - ball spin torque force; f2 - rotating rod rubber seal torque force; f3 - pipeline dynamic force of the water pressure on the ball valve;
The market motor ball valves switch time: 8-14 seconds have several, which test THEFT-structure in about eight seconds and about 14 seconds of motor ball valves. The test environment is 1.0MPa, the power supply directly to the battery supply. The test was performed using a new battery. Test results: 8 seconds motor ball valves in the the 0.6MPa dynamic environment off valve is very difficult, and sometimes does not close on more normal; 14 seconds THEFT-off valve 1.0MPa dynamic environment, and closing valves mistakes phenomenon.
According to the results of the two trials, we can see, the torque of the ball valve is very important. We assume that: the motor is the same parameter, then if 8 seconds than the speed than the speed of 1 to 14 seconds of time is 1.75. Motor ball valves, so the key is deceleration than the speed of the size of the problem, but said earlier, several process issues is very important.
2), flat stack valves: a valve developed on the basis of the mechanical seal structure. The characteristics of the valve is horizontal, and the flows to progress under a Therefore, the valve is closed, the water pressure on a valve piece play a large role, the higher the pressure the better the sealing performance. Valve sheet when working for planar rotational movement, the need to overcome the coefficient of friction between the valve plate, and the ball valve as large hydraulic affect it. But to overcome the frictional force on the laminations in the water under a pressure. Through the actual test, Fu did not add how much force was friction between the laminations. The test was carried out according to the following method on the same only meters:
⑴ the ammeter connected in series to the switch circuit manipulation open valve, closing the valve switch control; ⑵ IC card water meter installed in the 105m lift pump pipe before the meter interface connected to a pressure gauge and three-way valve to regulate pipeline water supply the valve switch running test, the pressure; ⑶ on the water pump to adjust the pressure at 1.0MPa about; (4) by adjusting the valve pressure gradually adjusted to 1.5MPa.
The test is carried out in a dynamic environment, fully consistent with the actual use of mining, at 1.0MPa or the current required is: OFF valve starting 50mA, when to be closed, the current is suddenly increased to 110mA; current valve opening time: open valve started about current 110mA current rapidly dropped to 50mA when the valve opens.
The current required at hydrostatic 1.5MPa: off valve starting 55mA, and when to be closed, the current is suddenly increased to 120mA; current valve opening time: Open the valve at the start, about current 120mA, when the valve opens the outflow of water from the table The current rapid decline to 55mA. Seen from the test results, the water pressure on the influence of the lamination valve is small, the reaction is carried out in the current change is from 5mA to 10mA. The water pressure is increased from 1.0MPa to 1.5MPa increased by 50%; current increased from 50mA to 55mA and rose from 110mA to 120mA, and an increase of about 10% and, therefore, the water pressure in the lamination valve on the valve-opening force The impact is relatively small, and the relationship is 1:5. Of course, this must be on the basis of the specific material and the friction coefficient.
The plane stack valve deceleration switching time of 8 seconds and 14 seconds. Two time valve test, the test environment to 1.0MPa supply direct supply to the battery. The test was performed using a new battery. Test results: 8 seconds flat stack valves the normal the 1.0MPa dynamic environment switch; 14 seconds flat stack valve normal the 1.5MPa dynamic environment switch.
Summary
We already know from the test results and the results of theoretical calculations, the plane stack valve structure to adapt to the smart meter with the actuator. In the mountain city water supply pressure of the Division and the the ordinary plains of the city's water pressure, the current high-rise buildings of the city's water supply pressure will be higher than normal floor water pressure, not subjected to a rigorous validation of the valve should be lost in a high pressure environment function. The smart meter is a modern high-tech products, representing the level of automation of instrument development, as a developer, the smart meter development to meet the requirements of the user in the first place, the product should be able to cover all the use environment.
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