[Q&A] 4.23.2017
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Question: What are the characteristics of shielded pumps? Answer: A canned pump, also known as a sealless pump, has a compact design and prevents any external leakage; it is suitable for transporting flammable, explosive, toxic, radioactive, and valuable liquids. Shielded pumps do not have couplings, so there is no need to align their centers during disassembly and assembly; they are easy to operate and maintain, and their bearings do not require additional lubricating oil or grease. http://bbs.hcbbs.com/static/image/hrline/4.gif Petrochemical Zone—New Ideas for Energy Saving: The “Creative Thinking” Campaign (Sponsors sought; highest returns ever offered) http://bbs.hcbbs.com/thread-1666758-1-1.html Sponsors are being sought for this campaign; those interested can contact the event coordinator. The Petrochemical Deep Processing section—sharing pictures of chemical equipment has now started! A vast amount of wealth, as well as Hachuan coins, are waiting for you to claim them: http://bbs.hcbbs.com/thread-1760733-1-1.html. “Petroleum and Chemicals Section”: Notice regarding the collection of chemical industry-related technical materials: http://bbs.hcbbs.com/thread-1614796-1-1.html. http://bbs.hcbbs.com/hcdown/data/attachment/forum/201704/07/123053embbjkok61hz6vvz.jpg.thumb.jpg. [Haixin Chemical Cup ★ Spring has arrived for Hachuan Chemicals] Summary post of the 2017 scenery-sharing event (you can take a look at the local landscapes posted by users from various places in your free time): http://bbs.hcbbs.com/thread-1766484-1-1.html
The impeller of the pump and the rotor of the motor are on the same shaft and mounted within the same sealed housing; there are no couplings or shaft seal devices, which fundamentally eliminates the problem of leakage of the liquid being transported. Advantages: No medium leakage ； With a compact design, the vertical small-scale pipeline shielded pump can be installed directly on the pipeline without the need for a foundation ； Without a coupling, alignment is not required during installation and removal, making operation and maintenance convenient ； The bearings do not require additional lubricants or greases ； Suitable for transporting flammable, explosive, toxic, radioactive, and valuable liquids.
The shielded pump has a compact design and does not leak externally; it is used for transporting flammable, explosive, toxic, radioactive, and valuable liquids. Shielded pumps do not have couplings, so alignment is not required during installation or removal; they are easy to operate and maintain ； The bearings do not require additional lubricating oil or grease.
Integrated motor and pump design with fully static seals, ensuring complete leak-free operation of the electric pump； Its fully enclosed, leak-proof design enables the transport of toxic and hazardous liquid substances ； By using a shielded water-cooled motor and eliminating the cooling fan, this pump operates in a low-noise manner, making it suitable for applications with high requirements regarding environmental noise ； Graphite sliding bearings lubricated with a conveying medium result in lower operating noise and eliminate the need for manual oiling, thereby reducing maintenance costs ； In recent years, bearing materials have included silicon carbide SIC and superhard materials, which offer a longer service life than graphite bearings. The vertical structure can be installed on pipelines like a valve, making installation easy and fast; moreover, during maintenance, only the motor and impeller need to be removed, without the need to take down the pipelines. It can be installed and operated in conjunction with shock absorbers or shock pads, resulting in lower noise levels when the electric pump is in use
Fully sealed, without shaft seals, leak-free
The impeller of the shielded pump and the rotor of the motor are on the same shaft and located within the same sealed casing; there are no couplings or shaft seal devices, which fundamentally solves the problem of leakage of the liquid being transported. Structural feature: No medium leakage ； Compact in design, without couplings; no alignment is required during disassembly and assembly, making it easy to operate and maintain ； The bearings do not require additional lubricants or greases ； Suitable for transporting flammable, explosive, toxic, radioactive, and valuable liquids.
(1) Fully enclosed. There are no dynamic seals in the structure; only static seals are present at the pump’s casing, which enables complete leak-free operation. It is particularly suitable for transporting flammable, explosive, valuable liquids, as well as toxic, corrosive, and radioactive liquids. (2) High safety. Both the rotor and the stator are equipped with shielding sleeves to prevent them from coming into contact with the material; even if these shielding sleeves are damaged, there is no risk of external leakage. (3) Compact structure with low land footprint. The pump and motor are integrated as one unit; it requires minimal requirements for the base and foundation, and its daily maintenance is simple with low costs. (4) It operates smoothly, produces low noise, and requires no lubricating oil. Since there are no rolling bearings or motor fans, no lubricant is required, and it produces low noise. (5) Wide range of applications. It can meet the requirements for various operating conditions such as high temperature, high pressure, low temperature, and high melting point.
①Fully enclosed. There are no dynamic seals in the structure; only static seals are present at the pump’s casing, which enables complete leak-free operation. It is particularly suitable for transporting flammable, explosive, valuable liquids, as well as toxic, corrosive, and radioactive liquids. ②High security. Both the rotor and the stator are equipped with shielding sleeves to prevent them from coming into contact with the material; even if these shielding sleeves are damaged, there is no risk of external leakage. ③Compact structure with low space requirement. The pump and motor are integrated; no centering is required for disassembly or assembly. It has low requirements for the base and foundation, requires little routine maintenance, and results in low maintenance costs. ④It operates smoothly, with low noise, and requires no lubricant. Since there are no rolling bearings or motor fans, no lubricant is required, and it produces low noise. ⑤Wide range of applications. It can meet the requirements for various operating conditions such as high temperature, high pressure, low temperature, and high melting point.
In a conventional centrifugal pump, the drive mechanism connects the impeller shaft of the pump to the electric motor shaft through a coupling, allowing the impeller to rotate together with the motor in order to function. In contrast, a shielded pump is a type of seal-less pump; both the pump and the drive motor are enclosed within a pressure vessel filled with the medium to be pumped. This pressure vessel has only static seals, and an electrical winding set is used to generate a rotating magnetic field that drives the rotor. This design eliminates the rotating shaft sealing mechanism found in traditional centrifugal pumps, thereby achieving complete leaklessness. A shielded pump combines the pump and the motor together; the rotor of the motor and the impeller of the pump are mounted on the same shaft. A shielding sleeve is used to separate the rotor from the stator of the motor. The rotor rotates within the medium being transported, with power being transmitted to it through the magnetic field of the stator. Furthermore, the manufacturing of shielded pumps is not complex; their hydraulic section can be designed and manufactured according to the structural types commonly used in centrifugal pumps as well as relevant standard specifications.
Features: 1. Integrated motor and pump design, with all static seals in use, ensuring complete leakage-free operation of the electric pump； 2. A fully enclosed, leak-proof design that enables the transport of toxic and hazardous liquid substances ； 3. The use of a shielded water-cooled motor along with the elimination of cooling fans enables this pump to operate in a low-noise manner, making it suitable for applications where low environmental noise levels are required ； 4. Graphite sliding bearings lubricated by a conveying medium result in lower operating noise and eliminate the need for manual oiling, thereby reducing maintenance costs ； In recent years, bearing materials have included silicon carbide SIC and superhard materials, which offer a longer service life than graphite bearings. 5. The vertical structure can be installed on the pipeline like a valve, making installation easy and fast; moreover, during maintenance, only the motor and impeller need to be removed, without the need to disconnect the pipeline. 6. It can be installed and operated in conjunction with shock absorbers or shock pads, reducing the noise generated by the electric pump during operation.