Question:Pressure Rise Rate: What is the achievable static pressure rise rate of the furnace body?

Detailed Answer:

The pressure rise rate is a key technical indicator for measuring the sealing performance of vacuum or pressure equipment and the integrity of the vacuum chamber. It is like a "physical examination" for the furnace body—the lower the value, the "healthier" the equipment and the better the sealing performance.

I. What is Pressure Rise Rate?

Simply put, it refers to the increase in pressure inside the furnace per unit time after all valves are closed and vacuum pumping or gas filling is stopped. It objectively reflects the leakage rate of the furnace body and its components (such as seals, electrodes, valves, etc.).

II. Our Technical Standards

Depending on the equipment's operating mode, we have corresponding pressure rise rate assessment standards:

• For Furnaces Operating Under Slight Positive Pressure:The standard is≤ 100 Pa/hour. This means that after closing the inlet and exhaust valves, the pressure inside the furnace rises no more than 100 Pascals per hour, indicating excellent sealing performance sufficient to maintain a long-term slight positive pressure protective atmosphere.

• For Vacuum Operating Furnaces:The requirement is more stringent, with a standard of≤ 0.67 Pa/minute (approximately 40 Pa/hour). This indicator ensures that the equipment can quickly reach and maintain the required vacuum level for processes demanding high vacuum.

III. Why is This Indicator Important?

• Ensuring Process Purity:A low pressure rise rate means external air struggles to infiltrate, ensuring high purity of the furnace atmosphere and safeguarding product quality.

• Reducing Operating Costs:For vacuum pumps, good sealing means shorter pumping times and lower power required to maintain vacuum, saving electricity costs and reducing pump wear in the long run.

• Acceptance Basis:The pressure rise rate is a mandatory test item before equipment delivery and during on-site acceptance, serving as a written performance commitment.

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