Before the use of fire pump, only all aspects of the sealing work can be used, because the pump is mainly with the help of pressure and other forces to complete its pumping, suction and other work. One of the conditions for performing these operations is good sealing. If there is no good sealing, it is easy to leak, so the use of equipment will be affected. What are the pump seals for this equipment?
1, packing: by the form of shaft seal water injection, kept inside the packing will certain pressure of water injection, to prevent fire pump pump body slurry leaking: pay for impeller shaft seal is not suitable for using multilevel series pump, need to use the shaft seal packing, and packing seal structure is simple, convenient maintenance, cheap, let people easy to accept.
2, pay impeller seal: is operated by a reverse centrifugal force impeller force, so as to prevent the occurrence of slurry leakage. In the pump inlet positive pressure value than the pump outlet pressure value is small, single stage fire pump pump or multistage pump can use the impeller shaft seal, and auxiliary impeller shaft seal has no dilution of the slurry, no shaft seal water, good sealing effect and other advantages, so in the slurry is prohibited to have dilution of the case, can consider this seal.
3, mechanical sealing: usually used in the case of high sealing requirements.
These three groups of sealing forms have their own in common is strong sealing, in the use of the fire pump, because the equipment is sealed, so there will not be other random impurities into the pump, choose the appropriate sealing form can not only strengthen the pump seal, but also eliminate the occurrence of leakage phenomenon.
There is a principle to buy a fire pump is to spend a little more money to buy brand new rather than spend a little less money to buy refurbished, this has some truth, because refurbished pumps look the same as new, in fact, many safety risks. How to judge whether the pump is refurbished?
First, the original pump or supporting manufacturers of product packaging are generally more standard, clear and formal writing, detailed product name, registered trademark, specifications and models, factory name, factory address and telephone number; Counterfeit accessories are generally coarse packaging, factory address, factory name printing is not clear, incomplete;
Two, qualified fire pump surface smooth, good workmanship. The more important parts, the higher the processing accuracy, the more strict the packaging rust prevention and corrosion. When purchasing, if it is found that the parts have rust spots or rubber parts cracking, losing elasticity or the surface of the journal has bright processing grain, it may not be the original accessories;
Three, although the appearance of the inferior pump is sometimes good. However, due to the poor production process, it is easy to be damaged. When buying, as long as you observe the hidden parts such as the edges and corners of the accessories, you can see the quality of the accessories process;
Four, some pumps are refurbished with waste accessories, as long as the accessories can be found after the surface paint. Important parts such as the brake system, driving system accessories if the use of such refurbished parts, it is easy to occur danger;
5. In order to ensure that the assembly relationship of the fire pump meets the technical requirements, some regular parts are coated with assembly marks to ensure the correct installation of accessories. If there is no mark or the mark is vague and cannot be identified, it is not qualified parts.
Six, to buy parts to the car, to see if it can and accessories have a good match. General original accessories can be well allocated to the car, and inferior accessories due to the process is not fine, processing error is large, so it is difficult to cooperate with the parts;
Seven, the normal fire pump parts must be complete and intact, to ensure the smooth loading and normal operation. Some small parts are missing, it is easy to start loading the car, which may be fake parts;
Eight, some important accessories, factory generally with instructions, certification, in order to guide the user installation, use and maintenance, counterfeit generally will not have a detailed installation instructions to guide these.
Post time: Aug-12-2022