Vapor-phase type heating method and vapor-phase type heating apparatus

Patent metadata

Field	Value
Publication number	US-10875114-B2
Application number	US-201916274183-A
Country	US
Kind code	B2
Filing date	Feb 12, 2019
Priority date	Apr 16, 2018
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

In a vapor-phase type heating method, an object is heated by a heated gas containing vapor in a heating furnace. The heat transfer fluid falling from a front surface of the object to a lower portion of the heating furnace is collected, after the vapor comes into contact with the object and cools to liquefy and latent heat of vaporization of the vapor is applied to the object through phase change. The heated gas obtained after heating the object is discharged from an inside of the heating furnace to the circulation route. In the circulation route, the heat transfer fluid is supplied as droplets to the discharged heated gas and is vaporized after heating, and the heated gas including the vapor is supplied to the heating furnace.

First claim

What is claimed is:

1. A vapor-phase type heating method of supplying vapor of a heat transfer fluid to a heating furnace and heating an object by using latent heat of vaporization of the supplied vapor, the method comprising:
heating the object with a heated gas containing the vapor of the heat transfer fluid in the heating furnace;
collecting the heat transfer fluid falling from a front surface of the object to a lower portion of the heating furnace, after the vapor comes into contact with the object and cools to liquefy, and latent heat of vaporization of the vapor is applied to the object through phase change;
discharging the heated gas after heating the object from the heating furnace to a circulation route;
supplying the heat transfer fluid as droplets in the circulation route to an upstream side from a heat source that heats the heated gas;
then, heating the droplets so as to be changed into vapor and supplying the heated gas containing the vapor from the circulation route again to the heating furnace; and
maintaining a predetermined amount of the vapor of the heat transfer fluid in the heating furnace by the collecting and the supplying and heating the object which is disposed in the heating furnace at a predetermined rate of temperature rise in a state of an even distribution of the vapor of the heat transfer fluid in the heating furnace,
wherein the heat transfer fluid having liquefied, when the latent heat of vaporization of the vapor of the heat transfer fluid is applied to the object, is re-heated by using a re-heating device disposed in the heating furnace, by contacting the heated gas containing the vapor of the heat transfer fluid with the object that is disposed in the heating furnace in the heating furnace, and the heat transfer fluid is changed into vapor.

2. A vapor-phase type heating method of supplying vapor of a heat transfer fluid to a heating furnace and heating an object by using latent heat of vaporization of the supplied vapor, the method comprising:
heating the object with a heated gas containing the vapor of the heat transfer fluid in the heating furnace;
collecting the heat transfer fluid falling from a front surface of the object to a lower portion of the heating furnace, after the vapor comes into contact with the object and cools to liquefy, and latent heat of vaporization of the vapor is applied to the object through phase change;
discharging the heated gas after heating the object from the heating furnace to a circulation route;
supplying the heat transfer fluid as droplets in the circulation route to an upstream side from a heat source that heats the heated gas;
then, heating the droplets so as to be changed into vapor and supplying the heated gas containing the vapor from the circulation route again to the heating furnace; and
maintaining a predetermined amount of the vapor of the heat transfer fluid in the heating furnace by the collecting and the supplying and heating the object which is disposed in the heating furnace at a predetermined rate of temperature rise in a state of an even distribution of the vapor of the heat transfer fluid in the heating furnace,

wherein an amount of the vapor of the heat transfer fluid in the circulation route is adjusted by supplying the heat transfer fluid as droplets to the circulation route from a single-fluid type sprayer,
wherein an amount of the vapor of the heat transfer fluid in the circulation route is adjusted by supplying the heat transfer fluid as droplets to the circulation route from a single-fluid type sprayer, and
wherein the heat transfer fluid having liquefied, when the latent heat of vaporization of the vapor of the heat transfer fluid is applied to the object, is re-heated by using a re-heating device disposed in the heating furnace, by contacting the heated gas containing the vapor of the heat transfer fluid with the object that is disposed in the heating furnace in the heating furnace, and the heat transfer fluid is changed into vapor.

3. A vapor-phase type heating apparatus comprising:
a heating furnace that holds an object inside and causes heated gas containing vapor of heat transfer fluid to come into contact with the object such that the object is heated by using latent heat of vaporization of the vapor;
a circulation route that discharges the heated gas after heating the object from the heating furnace and supplies the heated gas again to the heating furnace;
a blower that is disposed on the circulation route and sends the heated gas toward the heating furnace;
a supply device that is disposed on the circulation route and supplies the heat transfer fluid as droplets into the circulation route;
a heating device that is disposed on a downstream side from the supply device on the circulation route, heats the heated gas discharged after heating the object from the heating furnace, and heats the droplets of the heat transfer fluid supplied from the supply device so as to change the droplets into vapor of the heat transfer fluid;
a collecting device that collects the heat transfer fluid in the heating furnace;
a controller that controls each of the supply device and the collecting device of the heat transfer fluid and controls a supply amount and a collecting amount of the vapor of the heat transfer fluid with respect to the circulation route so as to adjust the vapor in the heating furnace to a predetermined amount;
a spray member that is disposed around the object in the heating furnace and performs substantially evenly blow of the heated gas in the heating furnace to the object; and
a re-heating device that is disposed below the heating furnace and re-heats the heat transfer fluid, which liquefies on a front surface of the object and falls down as droplets to a side below the object, such that the heat transfer fluid is changed into vapor.

4. The vapor-phase type heating apparatus of claim 3 , further comprising:
a single-fluid type sprayer that supplies the heat transfer fluid as the droplets to the circulation route and adjusts an amount of the vapor of the heat transfer fluid in the circulation route.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Nagai Koichi
• Hino Naofumi

Classifications

• B23K1/008

  Soldering within a furnace (B23K1/012 takes precedence) · CPC title

• B23K1/015 Primary

  Vapour-condensation soldering · CPC title

• B23K2101/42

  Printed circuits · CPC title

• B23K1/0016

  Soldering of electronic components · CPC title

• H05B1/0297 Primary

  Heating of fluids for non specified applications · CPC title