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Is a bladder-type accumulator suitable for use in series with gas cylinders or cylinder banks?
Published Time:
2024-11-15 17:19
Category:
Case study
1. Diaphragms typically have a shorter service life (compared to piston-type designs), and their quality varies significantly across different brands.
2. Many factors can shorten the diaphragm’s service life and lead to rupture, including variations in the diaphragm’s intrinsic quality and lifespan, improper handling during assembly (such as failure to pre‑fill with fluid for lubrication), incorrect procedures during pre‑inflation (e.g., insufficiently slow inflation), errors in calculating the pre‑inflation pressure, oil‑port flow velocities approaching or exceeding 7 m/s, single‑stroke reciprocation times of 10 seconds or less when used for energy storage, collisions between the diaphragm and check valves during operation, significant temperature fluctuations (including large seasonal temperature differences), prolonged lateral vibration, fluid‑induced corrosion, and inertial impacts from minute solid impurities in the working medium, among others.
3. When the bladder ruptures, the accumulator may fail suddenly, while the reservoir may experience oil spray and gas explosion, leading to system failures or losses due to repairs and shutdowns.
4. The bladder should not be made too large, as this would reduce its service life; under the U.S. ASME standard, the maximum capacity is typically 60 liters.
5. Operating pressure should not be excessively high; in China, the maximum allowable pressure is typically 31.5 MPa (with a safety factor of 3 or greater), while bladder-type accumulators are rated at 51.8 MPa (with a safety factor of 4).
6. When fluid is rapidly released, the poppet valve of a bladder-type accumulator may close prematurely, causing the accumulator to temporarily fail suddenly.
7. Since the bladder is made of rubber, it has relatively low strength and cannot withstand significant pressure fluctuations (note the bladder’s compression ratio); excessive pressure variations will substantially shorten its service life.
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What are the causes of severe pressure drop and shortened service life in bladder-type accumulators?
What are the causes of severe pressure drop and short service life in bladder-type accumulators? The structure of a bladder-type accumulator is quite simple, consisting mainly of an oil chamber surrounding the bladder and a gas chamber equipped with a gas‑tight seal. During operation, the hydraulic fluid must be connected to the hydraulic circuit; when the system pressure rises, the fluid flows into the accumulator, compressing the gas until the pressure in the system pipeline stabilizes.
How can we reduce failures when an accumulator malfunctions?
If an accumulator malfunctions, its performance will be directly affected, potentially leading to abnormal pressures and system failure. Therefore, it should receive close attention during routine operation, and appropriate measures must be implemented to mitigate risks. So, how can we minimize failures when an accumulator malfunctions? The following sections address this issue.
Accumulators are intriguing components in hydraulic systems, analogous to capacitors in electrical circuits or springs in mechanical systems. As critical energy‑storage elements, they serve a variety of sophisticated functions, including hybrid‑power applications, shock absorption, pressure stabilization (and sometimes flow‑rate regulation), and the rapid release of stored energy to simulate impacts.
Is a bladder-type accumulator suitable for use in series with gas cylinders or cylinder banks?
1. Bladders typically have a shorter service life than piston‑type accumulators, and their quality varies significantly among different manufacturers. 2. Many factors can shorten a bladder’s lifespan and lead to rupture, including variations in the bladder’s intrinsic quality and durability; improper handling during assembly (e.g., failure to pre‑fill with fluid for lubrication); incorrect procedures during pre‑charging (e.g., insufficiently slow inflation); errors in calculating the pre‑charge pressure; oil‑port flow velocities approaching or exceeding 7 m/s; single‑stroke reciprocation times of 10 seconds or less when used for energy storage; collisions between the bladder and check valves during operation; large temperature fluctuations (including significant seasonal differences); prolonged lateral vibration; fluid‑induced corrosion; and inertial impacts from minute solid contaminants in the working medium, among others.
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