To know electric circulating pump usage, we must know the structure and function of main components of electric circulating pump. Electric circulating pump is mainly composed of suction parts, exhaust parts, impeller and shaft, shaft seal, diffuser, and four major part pump shell, etc.
1. The impeller is the main part of pumping liquid and it is one of the most important parts of electric circulating pump, which is driven by impeller centrifugal force effect to give the pumping fluid velocity. Do you know china solar collector and solar water heater collector ? Besides, it can increase the pressure and speed of the fluid to complete the process of liquid pump. The shape of the pump impeller has different difference with different revolutions. By the order of the impeller and the direction of liquid flow in the impeller, they can be divided into radial flow, mixed flow impeller, oblique flow, and axial flow impeller. By the impeller structure they can be divided into closed impeller, open impeller, idler full open impeller, and half open impeller.
2. To know electric circulating pump usage, we must know the pump casing. Pump casing is the center of the solar hot water heater system structure, it has many types.
2.1 horizontal split styles
This type of pump shell can be separated by the level of the axis of subdivision surface. Removing the pump shell has nothing to do with suction and discharge piping, making the maintenance more convenient.
2.2 vertical split styles
This type of pump shell can be separated by the vertical axis of planar subdivision, making it not easy to leak. When maintenance it we must remove the import and export pipeline, making it not as convenient as horizontal split pump shell.
2.3 barrel postures style
This type of pump is made pump shell into the tube postures, for pump that pressure is very high, using a single solar circulating pump body is difficult to bear the pressure, so we adopt the double pump body. You will know how to make a passive solar collector manufacturer well. Cylinder style pump shell can bear high pressure, it has standard split or vertical split rotor, and most pumps of chemical fertilizer plant pumps are this kind of pump.
3. To know electric circulating pump usage, we must know its packing and seal. For small capacity, low head of solar hot water heater system, we always use sealing packing to seal. The sealing mechanism can be described as followed: Packing is installed inside a stuffing box, between packing and shaft, packing and stuffing box wall there was a ring shaped tiny space between the contact surface, the size of the gap is the main factor related to the leakage of medium. Packing in the packing box deformation due to the effect of clamping force to fill the annular space and prevent the leakage of the medium. Under the pre-loaded pressure transmission, due to a lot of resistance, it makes each packing ring under the same radial force from different size and direction. When the radial force is greater than medium pressure, we can prevent leakage of medium. If we use woven packing, medium leakage may have the following situation. Filler itself after penetrating could cause leakage of medium. This requires us choosing ring and poltfeet packing that cannot penetrate the metal.