An acetylene gas concentration estimation device, an acetylene gas appropriate amount estimation device, and a vacuum carburizing device equipped with the device.

摘要

To provide an acetylene gas concentration estimation device capable of simply estimating concentration of acetylene gas, and a vacuum carburization device with the device.SOLUTION: An acetylene gas concentration estimation device 20 comprises: an acetylene gas decomposition part 21 for decomposing acetylene gas to a carbon component and hydrogen gas; a first sensor 22 arranged on an upstream side of the acetylene gas decomposition part and measuring hydrogen gas concentration on an upstream side of the acetylene gas decomposition part; and a second sensor 23 arranged on a downstream side of the acetylene gas decomposition part and measuring the hydrogen gas concentration on the downstream side of the acetylene gas decomposition part. A vacuum carburization device 1 comprises a vacuum carburization chamber 6 for performing vacuum carburization by acetylene gas, and the acetylene gas concentration estimation device 20. The acetylene gas concentration estimation device is arranged on a gas exhaust passage 17 communicated with the vacuum carburization chamber and reducing pressure of the vacuum carburization chamber.SELECTED DRAWING: Figure 2