Self-priming sewage pump self-priming performance of how to improve the first: self-priming sewage pump suction pipe end of the installation of suction valve. Suction valve is actually a check valve, which ensures that water can only enter the suction pipe from the pool and can not reverse, so if the suction pipe filled with water, although the pump shaft elevation above the working level of the pool, but due to suction bottom The role of the valve, the suction pipe water will not flow into the pool, the suction pipe has been filled with water, to ensure that the pump can automatically and quickly start. The reliability of this way of absorbing water is affected by the quality of the suction bottom valve. For example, the water in the suction pipe slowly flows into the pool due to the lax shut-off and water leakage, and there is no water in the suction pipe. As a result, Need artificial irrigation. Second: self-priming sewage pump to reduce the water pipe bend, drop height and horizontal distance. Third: self-priming sewage pump set pump suction tank. In this way, a water suction tank needs to be set on the water suction pipe of the water pump. Before the first operation of the water pump, the water in the tank should be manually filled with water. After the first operation is stopped, because the height of the water inlet pipe of the water suction tank is higher than the water level in the pipe, Therefore, the water tank can store a certain amount of water, and because of the suction tank outlet pipe (ie, the suction pipe of the water pump), the height of the water tank Below the surface of the water tube, it can ensure that the pump suction pipe full of water, after the pump and then run, the water tank was pumped water pump, tank negative pressure, the pool of water under the action of atmospheric pressure added to Suction tank, through the sump tank inside. Fourth: self-priming sewage pump set in the pump suction pipe vacuum pump, pump start, the vacuum pump first start, so that the pump suction pipe filled with water, to ensure that the pump automatically, quickly started. This kind of water absorption method needs perfect automatic control system to ensure normal work. Self-priming pump self-priming principle: Self-priming pump is commonly used in the South a pump. The principle is the use of water flow momentum, impeller driven pump impeller to the river above the water. The pump can be pumped into the river to pump water, but it must be in immediate rush or fall. Self-priming pump self-priming refers to the suction tube without filling the liquid (but the pump body must have enough liquid) to start the pump, the pump itself can automatically remove the suction tube gas, and then into normal work, the pump at the first start Must be filled with enough liquid, after start by the liquid stored in the pump body to ensure that the pump can start again.Self-priming pump self-priming time refers to the pumping pump to clean the liquid at room temperature, the installation height is to allow suction vacuum Going to 0.5, the minimum time it takes for the pump to start to stabilize the pressure, which is the time it takes for the pump to drain the tube of air, is the length of the suction line between the suction side of the centrifugal pump and the pump inlet Less than the installation height of the pump plus 20D (suction pipe hole diameter); the suction pipe length between the suction surface of the vortex self-priming pump and the inlet of the pump should be less than the installation height of the pump plus 2. The ordinary centrifugal pump in the suction pipe Bottom valve is installed at the bottom, more water needs to be filled into the entire suction pipe before starting, and the bottom valve often breaks down due to clutter or closing itself, and sometimes it takes a lot of labor to eliminate these faults, Especially in winter . Self-priming pump suction port is generally higher than the impeller suction port, as long as the pump body can be started in irrigation, without the above defects. Self-priming pumps are convenient for mobile irrigation and drainage, mobile work, frequent start-ups and difficult irrigation. Self-priming pumps are used in many places such as agriculture, construction, tank truck unloading, oil depots, fire fighting and shipbuilding. Self-priming sewage pump self-priming performance: 1. The determination of the liquid storage volume and the height of the liquid storage tank is the volume of the liquid part of the pump body can be stored after the pump is stopped, that is, the pump below the lowest point of the pump body Volume, this part of the volume is mainly the pressure chamber and gas-liquid separation chamber part. The volume of the reservoir should be not less than half of the pump design flow in seconds (for example, if the pump design flow is not less than the volume of the reservoir and the volume of the reservoir is too small (too little liquid is stored in the pump), self-priming Time increases, or even self-absorption; over, making the pump bulky. In addition to having a sufficient reservoir volume, there must also be a reservoir height, which is the height at which the pump sucks in to the center of the impeller, usually approximately equal to the impeller radius. 2 · Determination of the volume of the gas-liquid separation chamber and the height of the outlet of the pump Gas-liquid separation refers to the part outside the pressure chamber of the pump. The larger the volume, the better the separation effect of gas and liquid and the faster the separation. Liquid separation chamber volume to a certain extent, then increase the effect is not significant, the reverse will make the pump body bulky, so the gas-liquid separation chamber has an optimal volume value, according to the experience of its value is equal to or slightly larger than the storage Liquid volume, in ensuring gas-liquid separation chamber capacity case, the pump outlet to the impeller centerline height according to the liquid storage volume and gas-liquid separation chamber volume at the time of drawing to determine the height. 3. Determination of liquid flow rate out of the chamber Centrifugal pump self-priming pump out of the chamber liquid flow rate than the average centrifugal pump is lower, about equal to the general centrifugal pump out of the chamber liquid flow rate of 80-90%. 4 · Determination of the gap between the tongue and the impeller gap For the centrifugal self-priming pump, the gap between the tongue and the impeller has a great influence on the self-priming performance, the gap between the tongue and the impeller in the upper pressure chamber is smaller, Shorter, this gap is usually mixed outside; take mixed inside. If the design of the double cochlear chamber then the lower part of the pressure chamber separating the gap between the tongue and the impeller, usually according to the general centrifugal pump pressure chamber to determine the gap between the tongue and impeller to determine that the lower diaphragm located in the base of the volute chamber, and . 5. Turning of the impeller rear cover For external mixing centrifugal self-priming pumps, when the impeller outer circle speed is less than the self-priming effect, the method of turning the impeller rear cover may be used to improve the self-priming capability because of the ease of self- Suction process of liquid and gas mixture. Turn the amount can not be too large, otherwise it will significantly reduce the pump head and efficiency. At that time, the impeller rear cover diameter after cutting; at that time, and in the separation of the tongue at the ribs to prevent bubbles with liquid in the cut off the back cover at the cycle, affecting self-absorption effect. 6. Area of ​​Backflow Hole For the inner mixing centrifugal self-priming pump, the area of ​​the backflow hole has a great influence on the self-priming performance and the area is large so that the liquid that returns to the inlet of the impeller through the backflow hole is large, so the self-priming time is short but The maximum vacuum degree of self-priming decreases; self-priming time is longer when the backflow hole area is small, and the height of the maximum self-priming vacuum is high. In summary, to determine the area of ​​the backflow hole, we must consider the self-priming time and self-priming height requirements.
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