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About the use of sewage treatment equipment metering pumps and troubleshooting
As one of the sewage treatment equipment, metering pumps, for it, you know how much it? Any sewage treatment can not be separated from the pump, this article on the details for everyone to talk about metering pumps. Metering pump 1, Metering pump Description Metering pump, also known as quantitative pump or proportional pump. Dosing pump is a kind of special volume pump which can meet the needs of a variety of strict process flow, the flow can be steplessly adjusted within the range of 0-100% and used to transport liquid (especially corrosive liquid). Metering pump control Metering pump fluid volume per pump determines its measurement capacity. Metering pump is a one-way displacement pump, the pump chamber pressure is greater than the external pressure when the metering pump can play a liquid. When the external pressure is higher than the pressure on the sign, the metering pump is in overloaded condition. If the electromagnetic diaphragm metering pump, the flow will drop a lot, or even hit the liquid; if the motor-driven metering pump, the motor may overheat damage. 2, metering pump mechanism features and instructions Pump is divided into two categories, one is the plunger metering pump, one is the diaphragm metering pump. Below we do a brief description of the mechanism of these two metering pumps. Plunger metering pump: The motor drives the worm gear pair to make variable-speed motion through the direct drive, and converts the rotational motion into the reciprocating linear motion under the action of the crank and connecting rod mechanism. Plunger reciprocating linear motion, directly with the media in contact, through the pump head opening and closing the role of one-way valve to complete suction purposes. Achieve the function of transporting liquid. A plunger for the principle of introduction, a piston pump has two one-way valve, and the opposite direction, the piston moves to a negative pressure within the cylinder, then a one-way valve to open the liquid is sucked into the cylinder, When the plunger moves in the other direction, the other one-way valve after the liquid is compressed is opened, and the liquid sucked into the cylinder is discharged. This work continues to form a continuous campaign after the solution. Diaphragm metering pump: motor driven by direct drive worm gear for variable speed movement, the role of the crank connecting rod mechanism, the rotary motion into a reciprocating linear motion. Sliding bar and diaphragm directly connected to the work when the slide bar reciprocating push (pull) move the diaphragm back and forth, through the pump head opening and closing the role of one-way valve to complete suction purposes. Achieve the function of transporting liquid. Instructions for use are as follows: 1 plunger metering pump: Plunger reciprocating linear motion, directly with the media in contact with the import and export of one-way valve to complete suction and discharge liquid. For a variety of high-pressure, low pressure (pressure 0-60Mpa), strong corrosive occasions. Measurement accuracy of less than 0.5%. 2 hydraulic diaphragm metering pump: With plunger reciprocating motion in the cylinder, the cavity produces oil pulsating force, pushing the diaphragm back and forth agitation, in the import and export of the role of the valve to complete the purpose of suction and discharge liquid. Because the diaphragm completely separates the plunger from the medium being delivered, liquid can be prevented from leaking outwards. Its pressure range of use is 0-35Mpa. Hydraulic diaphragm metering pump each configuration of three valves or two valve device: automatic charge valve, safety valve, exhaust valve. Accurate metering, high pressure, corrosion-resistant and completely leak-free is its significant advantage. 3 Mechanical Diaphragm Metering Pump: It is different from the hydraulic diaphragm is the direct connection of the slider and the diaphragm, the work of the slider reciprocating push (pull) move the diaphragm back and forth directly, through the pump head check valve Opening and closing the role of suction to complete suction. It has the hydraulic diaphragm pump does not leak, strong corrosion-resistant outstanding advantages, but also cheap. Suitable for low pressure and small and medium flow applications. 3, the characteristics of metering pump stroke adjustment Metering pump is designed to measure the liquid pump. The vast majority of metering pumps use both piston and diaphragm pumps (see reciprocating pumps) and are also useful gear pumps because they maintain a constant flow independent of discharge pressure. There are two kinds of metering pump flow can be adjusted and can not be adjusted, the former is more applicable. The flow rate is mainly adjusted by changing the stroke length, such as changing the radius of the crank, the position of the back stop point on the plunger return stroke and the gap between the plunger rod and the crosshead. The flow rate can also be adjusted by changing the reciprocating frequency or both. Although the stroke length can be adjusted from zero to maximum, but in order to ensure measurement accuracy, are generally limited to 30 ~ 100% range. 4, the selection of metering pumps 1 to determine the pressure The selected metering pump rated pressure slightly higher than the actual maximum pressure required, generally higher than 10 to 20%. Do not choose too high, the pressure is too high will waste energy, increase equipment investment and operating costs. 2 Determine flow The flow of the metering pump selected should be equal to or slightly larger than the flow required for the process. Dosing pump flow range of use in the metering pump rated flow range of 30 to 100% better, then the metering pump repeated reproduction of high precision. Considering economical and practical, it is suggested that the actual required flow rate of the metering pump should be selected to be 70-90% of the rated flow rate of the metering pump. 3 to determine the pump head (hydraulic end) material metering pump specific model specifications are determined, and then select the flow of over-flow medium according to the properties of the material part of this step is very important, if not properly selected, will result in dielectric erosion damage over-current Components or media leak contaminated systems. Serious accidents may also result. Other aspects of the choice of metering pumps, but also need to consider the required level of precision metering pumps, the higher the level of precision into more. Metering pump general operating temperature -30 ~ 100 ℃, special metering pump its working temperature range is wider (such as high temperature liquid metering pump with insulation jacket, the delivery temperature up to 500 ℃). For the media size, the requirement should be less than 0.1mm, for media greater than 0.1mm, can be targeted to the pump overcurrent structure to be changed to meet the needs. The viscosity of the medium should generally be 0 ~ 1000mm / s, special metering pump up to 6000mm2 / s, the flow of mechanical diaphragm metering pump is the maximum flow rate measured under the rated pressure (at room temperature, water delivery ), If the pressure drops, the output of the flow rate will be higher than the calibration. Note: Does the motor need to be explosion-proof! 1. The outlet is higher than the inlet to avoid the siphon phenomenon. 2. The pump head and the injection valve are required to be installed vertically. 3. The attached pipe can be tightened by hand. Do not use the tool. Use the raw material tape; 4. The power supply voltage is stable and grounded; 5. The installation environment is clean, spacious and well-ventilated. 6 most people do not know the treatment of metering pump failure 1) metering pump suction fluid is not properly rotated to 100% stroke length position. This will rotate the entire assembly to the backplane drain vent and align with the bottom of the pump. Adjust hydraulic end and diaphragm to proper position during pump operation. The pulse duration may not be long enough for the reaction time. With respect to the standard pulse width of 80 msec, the flow monitor pulse width extension can be activated, increasing the pulse width to 300 msec. Activate the smart change-over switch, remove the cover of the fixed circuit board and remove jumper X-1. This activates the extended function, allowing more time before the fault indication. Dosing pump is installed from the exhaust pump head, using self-filling liquid suction. Keep the pipette as short as possible. 2) Dismounting the dosing pump diaphragm When removing the old diaphragm, it is often troublesome. Now provide some additional tips on how to remove the old diaphragm. 1 After the pump head is loose, adjust the stroke length to 0% before removing the pump head. You can ensure that the solenoid shaft has enough pressure to keep it firmly connected, so that you can unscrew the diaphragm. 2 Pull the hydraulic end outward to disengage the screw from the socket. Hold the liquid side counterclockwise. Slightly more resistance, you can spin the diaphragm. 3 Metering chemicals may crystallize on the hydraulic side, causing the check valve ball and seat to not work properly. 4 There may be a gas leak at the suction side of the metering pump. Fluid side suction side connections may lack o-rings or suction valve connections loose. (Editor: LLX QQ:) Recommended reading: 2017 Exhibition Information 2016 Yiwu Fair