The improper removal of the stator rubber in a screw pump is primarily caused by incorrect selection or poor treatment of the inner surface of the bonded pump casing. ![Single screw pump]()
One of the main causes of this issue is the failure to properly prepare or clean the inner surface of the pump casing before bonding. This can lead to weak adhesion between the rubber and the metal, causing premature detachment. Another key factor is the improper selection of the rubber material for the stator. If the hardness is too high or if the vulcanization process is not properly controlled—such as over-vulcanization or early vulcanization—it can significantly reduce the service life of the stator. Additionally, excessive interference between the stator and rotor can cause mechanical stress that leads to rubber failure. In many cases, the stator rubber is exposed to media containing abrasive particles, which can penetrate the rubber surface and cause damage. Since the tensile strength of the rubber is much lower than its compressive strength, these hard particles can stretch and eventually break the molecular chains, leading to cracks and further deterioration. Moreover, during operation, the stator may be subjected to cutting action from these hard particles, resulting in significant wear. Choosing the right rubber compound is therefore crucial. If the compound is not suitable for the application, the stator will wear out more quickly. Other contributing factors include an inappropriate rubber formula, low rubber content, incorrect hardness selection, uneven interference between the stator and rotor, poor-quality media, or rubber aging due to improper storage conditions. Another common issue is the deformation of the screw tooth shape in the stator. This often occurs when the rubber has poor compression set resistance, or when the production process is not properly controlled. Insufficient vulcanization, inaccurate shaping of the stator core, or misalignment during pressing can all contribute to this problem. Additionally, poor surface quality of the stator core or the rubber cavity can lead to structural issues. To ensure the quality of the rubber stator, it is essential to select the appropriate rubber type based on the operating conditions and the nature of the medium being pumped. Proper storage is also critical—stators should be kept away from direct sunlight, extreme temperatures, dust, oil, and corrosive substances. They should also not be stored beyond their recommended shelf life, typically around six months for most plastic-based materials. Finally, when manufacturing the stator, it’s important to accurately calculate the volume of rubber required. This includes the spiral cavity within the stator and any additional material needed for gates and risers. While precise calculation can be challenging, an approximate method is usually sufficient. Source: China Hardware Business Network http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
One of the main causes of this issue is the failure to properly prepare or clean the inner surface of the pump casing before bonding. This can lead to weak adhesion between the rubber and the metal, causing premature detachment. Another key factor is the improper selection of the rubber material for the stator. If the hardness is too high or if the vulcanization process is not properly controlled—such as over-vulcanization or early vulcanization—it can significantly reduce the service life of the stator. Additionally, excessive interference between the stator and rotor can cause mechanical stress that leads to rubber failure. In many cases, the stator rubber is exposed to media containing abrasive particles, which can penetrate the rubber surface and cause damage. Since the tensile strength of the rubber is much lower than its compressive strength, these hard particles can stretch and eventually break the molecular chains, leading to cracks and further deterioration. Moreover, during operation, the stator may be subjected to cutting action from these hard particles, resulting in significant wear. Choosing the right rubber compound is therefore crucial. If the compound is not suitable for the application, the stator will wear out more quickly. Other contributing factors include an inappropriate rubber formula, low rubber content, incorrect hardness selection, uneven interference between the stator and rotor, poor-quality media, or rubber aging due to improper storage conditions. Another common issue is the deformation of the screw tooth shape in the stator. This often occurs when the rubber has poor compression set resistance, or when the production process is not properly controlled. Insufficient vulcanization, inaccurate shaping of the stator core, or misalignment during pressing can all contribute to this problem. Additionally, poor surface quality of the stator core or the rubber cavity can lead to structural issues. To ensure the quality of the rubber stator, it is essential to select the appropriate rubber type based on the operating conditions and the nature of the medium being pumped. Proper storage is also critical—stators should be kept away from direct sunlight, extreme temperatures, dust, oil, and corrosive substances. They should also not be stored beyond their recommended shelf life, typically around six months for most plastic-based materials. Finally, when manufacturing the stator, it’s important to accurately calculate the volume of rubber required. This includes the spiral cavity within the stator and any additional material needed for gates and risers. While precise calculation can be challenging, an approximate method is usually sufficient. Source: China Hardware Business Network http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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