Is anyone familiar with AERZEN blowers? Why is this place so great? !
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This post was last edited by blade_wzy on 2021-9-1 22:31. An AERZEN Roots blower used for aeration in the sewage tank at the company has broken down; its model is GM35S. It is manifested as the lubricating oil being contaminated by black impurities such as ball-milled cast iron powder, as well as abnormal noises resulting from friction between the drive side wall plates and the rotor. Equipment imported from Germany; originally plans were to carry out maintenance, but upon checking the documents, there was only a general explosion diagram showing all the models. There are no detailed assembly diagrams, no requirements regarding assembly tolerances, and nothing at all about the methods of disassembly and assembly. There’s German text everywhere in the documentation, which is frustrating; when I asked the supplier, they said they wouldn’t provide it and advised against attempting to disassemble and repair it myself, recommending instead that it be sent back to the manufacturer for repair. . . :L would like to ask if everyone is the same? Despite the arrogant attitude, it’s undeniable that this device is indeed impressive: with a capacity of 38 cubic meters and an operating pressure of 0.7 Bar, it’s extremely compact compared to domestic fans. I’m not sure if there are any manufacturers that can produce even smaller fans ； Flexible movable base plate; the belt is automatically tensioned by the weight of the motor itself ； The speed at full load is as high as 3800 r/min; the temperature of the machine body during operation exceeds 80 degrees, while the temperature in the oil reservoir reaches 90-100 degrees or more. And yet, there is no cooling water used – the only means of cooling is a small fan mounted on the input shaft. It’s hard to understand how it’s possible for the machine to keep operating for such long periods of time ； The viscosity of the lubricant used is 150, which is much higher than the typical 68. Is it because there are no domestic manufacturers of this type of compact, high-performance Roots blower that this German company is so confident? Is it really impossible to produce such devices? !
I searched the Internet, but there was very little information available; most of it were operation instructions, with almost no content related to maintenance. . .
This is what’s called technological monopoly, intellectual property rights. It’s unreasonable to complain at this point; the terms of the technical agreement in the contract should be detailed before procurement. If there is a special need for miniaturization, one must endure such an attitude. For reference.
This post was last edited by blade_wzy on 2021-9-2 09:27. No input from the maintenance team was sought at the time of device design, and now that problems have arisen, we’re forced to carry out the repairs ourselves in order to save money. Without any maintenance documentation, one has to figure things out on their own; in the event of damage, responsibility still lies with them. . . To be honest, it’s understandable to complain a bit. Of course, complaining won’t solve the problem; I’m just surprised that even for an old type of equipment like rotary blowers, high-end products cannot still be manufactured in China. It’s strange considering all the development that has taken place over these decades. Is it because there is no demand for such products in China? ! :L
Aijen’s Roots pumps are still okay – well, relative to domestic ones that is! Compared to a few foreign ones, they are all more or less the same. As for domestic products, they always seem to be of lower quality in practical use, and that’s because they are all copies; there is no original design involved. The so-called design merely involves enlarging, shrinking, or modifying certain components based on the original design. If you asked domestic manufacturers to discard the existing blueprints and create a product with an independent technical style from scratch, they wouldn’t be able to do it... Of course, we are also from China, but the above mention of domestic manufacturers does not include our company……
There is indeed a large gap in domestic fans; many of them are mere imitations, with very few that have been perfected to the highest standard. This is a reflection of the national conditions, and it’s also a pity for real enterprises
You see, your view on this product represents that of a significant number of domestic mechanical product designers and manufacturers – people who are quite knowledgeable in terms of technology... But in reality, the real problem arises when the temperature of the machine body is too high. If the temperature of the oil reservoir is high, one might think of lowering it, but that will only lead to faster damage. The viscosity of the lubricating oil is chosen based on temperature, not on whether it’s a common or uncommon issue; it’s determined by the product design itself. Compact designs have a significantly lower design life and reliability – this is determined by the expected design life specified at the stage of product design; if maintenance is required on a short-term basis, then a compact design can be adopted, such as one that requires maintenance only once a year... Apart from this, for most users, whether such equipment is compact or not has little actual impact on production efficiency. Of course, there are specific exceptions, such as lithography machines, where the limited internal space of the equipment necessitates a compact design……
A person's abilities are limited; one must be brave enough to face oneself honestly. Do your best on what can be done; for what cannot be done, just hand it over. Because leaders exist for that purpose. It is recommended to look for other alternative devices on the market that meet the process requirements, which would be the best approach. It seems there are requirements regarding the size of the equipment. For reference. Hehe, it’s the leaders who create the problems, and then they pass the burden on to those below them,,,, Such things used to happen a lot.
Our company has 8 AiZhen fans, and the quality of these devices is really excellent. However, all our documentation is in English, including the drawings for the GM90S model; I can lend them to you for reference – they should be similar
Aijen’s fans indeed have excellent quality; the main units come from Germany, while the motors are from domestic joint-venture brands such as Siemens and ABB
Is the service life of Aijen bearings 25,000 hours? It is said that the usage time has been exceeded, and the malfunction is dangerous. I have 12 AiZhen units here; the original couplings were of the rubber type, and there were instances where the rubber cracked and flew off. Later, the manufacturer switched to coupling-driven systems for all of them.