CN-122018598-A - Air cooling system and cooling medium temperature control method at air cooling outlet

CN122018598ACN 122018598 ACN122018598 ACN 122018598ACN-122018598-A

Abstract

A cooling medium temperature control method at an air cooling system and an air cooling outlet belongs to the technical field of temperature control systems, and comprises a heat treatment furnace, a circulating pipeline, a bypass pipeline, a first temperature measuring element and a first temperature control unit, wherein the inlet end of the circulating pipeline is communicated with an air outlet of the heat treatment furnace, the outlet end of the circulating pipeline is communicated with an air inlet of the heat treatment furnace through a heat exchanger and is used for conveying cold medium gas cooled through the heat exchanger to form circulation of the cold medium gas, the bypass pipeline is arranged in parallel with the heat exchanger and is used for conveying hot medium gas which is not cooled through the heat exchanger, a temperature control valve is arranged on the bypass pipeline, the first temperature measuring element is arranged at the air cooling outlet of the circulating pipeline and is used for detecting the temperature of the medium gas after the cold medium gas and the hot medium gas are mixed, and the first temperature control unit is pre-stored with a cooling process curve and is respectively connected with the first temperature measuring element and the temperature control valve and is used for controlling the opening degree of the temperature control valve according to the set value of the cooling process curve and the detected temperature of the first temperature measuring element.

Inventors

YANG SHUO
LIU SHUNGANG
HE HONGFENG

Assignees

沈阳广泰真空科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (10)

1. An air cooling system, comprising: heat treatment furnace; The inlet end of the circulating pipeline is communicated with the air outlet of the heat treatment furnace, the outlet end of the circulating pipeline is communicated with the air inlet of the heat treatment furnace through a heat exchanger, and the circulating pipeline is used for conveying the cold medium gas cooled by the heat exchanger and forming circulation of the cold medium gas; The bypass pipeline is used for conveying hot medium gas which is not cooled by the heat exchanger, so that the hot medium gas is mixed with the cold medium gas in the circulation pipeline, and a temperature control valve is arranged on the bypass pipeline; the first temperature measuring element is arranged at the air cooling outlet of the circulating pipeline and is used for detecting the medium gas temperature after the cold medium gas and the hot medium gas are mixed; the first temperature control unit is pre-stored with a cooling process curve and is respectively connected with the first temperature measuring element and the temperature control valve, and the first temperature control unit is used for controlling the opening of the temperature control valve according to the set value of the cooling process curve and the detected temperature of the first temperature measuring element.
2. The system of claim 1, wherein the air outlet of the heat treatment furnace is disposed at an upper portion of the heat treatment furnace and the air inlet of the heat treatment furnace is disposed at a lower portion of the heat treatment furnace.
3. The system of claim 1, further comprising: the circulating power piece is arranged on the main road of the circulating pipeline close to the air inlet of the heat treatment furnace, is not connected with the bypass pipeline in parallel and is used for driving medium gas to forcedly circulate between the pipeline and the heat treatment furnace.
4. The system of claim 1, further comprising: And the second temperature measuring element is used for detecting the temperature in the heat treatment furnace.
5. The system of claim 4, wherein the second temperature sensing element is disposed at a top of the heat treatment furnace.
6. The system of claim 4, further comprising: The second temperature control unit is connected with the second temperature measuring element and is used for acquiring the temperature detected in the heat treatment furnace.
7. The system of claim 6, further comprising: the controller is respectively connected with the second temperature control unit and the first temperature control unit, and is used for judging a cooling process according to the temperature detected in the furnace and controlling the first temperature control unit to start the cooling process curve of middle section slow cooling when the preset switching temperature is reached.
8. A method for controlling the temperature of a cooling medium at an air-cooled outlet, applied to the system as claimed in any one of claims 1 to 7, comprising: Collecting the actual temperature of the medium gas after the cold medium gas and the hot medium gas are mixed; Comparing the set value of the cooling process curve with the acquired actual temperature; and adjusting the opening of the temperature control valve arranged on the bypass pipeline according to the comparison result, and adjusting the proportion of the mixed heat medium gas to ensure that the temperature of the cooling medium at the air cooling outlet changes along with the cooling process curve.
9. The method of claim 8, wherein prior to performing the cooling medium temperature adjustment, the method further comprises: acquiring the temperature detected in the heat treatment furnace; Judging a cooling process according to the temperature detected in the furnace; when the temperature detected in the furnace reaches a preset switching temperature, the first temperature control unit is controlled to start the cooling process curve adapting to the slow cooling of the middle section.
10. The method of claim 9, wherein prior to initiating the cool down process profile for the midsection slow cooling, the method further comprises: and keeping the temperature control valve in a closed state, and performing initial rapid cooling on the workpiece.

Description

Air cooling system and cooling medium temperature control method at air cooling outlet Technical Field The application belongs to the technical field of temperature control systems, and particularly relates to an air cooling system and a cooling medium temperature control method at an air cooling outlet. Background In the field of metal material heat treatment quenching process, the workpiece after heat treatment is required to be rapidly cooled at a high temperature stage, and the surface of the workpiece is enabled to form a fine grain structure through rapid cooling, so that the surface hardness of the workpiece is effectively improved, and the performance requirements of subsequent processing and use are met. However, in the actual quenching cooling process, the cooling rate of the workpiece is not as high as possible, if a very fast cooling mode is adopted in the whole process, the internal crystal grains of the workpiece are too fine, and negative effects such as deformation, cracking, insufficient toughness and the like of the workpiece are caused, so that the cooling rhythm is usually adjusted in the middle section of quenching cooling in the industry, and the sectional cooling of early-stage fast cooling and middle section slow cooling temperature control is realized by adopting a temperature-controllable air cooling process, thereby taking the hardness and internal tissue stability of the workpiece into consideration. In the related art, two conventional operation modes exist, namely, one is to synchronously carry out auxiliary heating on a workpiece in the air cooling process, and maintain the cooling temperature through heating compensation, and the other is to simply reduce the air speed of an air cooling fan without carrying out auxiliary heating, so as to slow down the cooling rate and realize slow cooling. On the one hand, the auxiliary heating and air cooling mode can lead to turbulence of air flow in a temperature field in a furnace, irregular mixing of cold and hot air flows, incapability of forming uniform and stable temperature field environments, large temperature difference at different positions in a heat treatment furnace, large temperature real-time fluctuation range, difficulty in realizing accurate control, and on the other hand, the slow cooling mode of simply reducing air speed cannot effectively regulate and control the ratio of cold air to hot air, the cooling rate of each part of the surface of a workpiece is inconsistent, the uniformity of the surface temperature is poor, the problem that the local hardness of the workpiece does not reach the standard easily occurs, meanwhile, the unstable temperature control mode can prolong the whole quenching processing time, additionally increase the electric energy consumption, cause energy waste and production cost increase, and also cannot guarantee the uniformity of the processing quality of batch workpieces. Disclosure of Invention In view of the above, the application aims to provide an air cooling system and a cooling medium temperature control method at an air cooling outlet, so as to adapt to the process requirement of heat treatment quenching sectional cooling, realize the accurate controllable adjustment of the temperature in the quenching cooling middle section, optimize the temperature field and air flow distribution state in a furnace, ensure the uniformity of the cooling temperature of the surface of a workpiece, simultaneously optimize the process energy consumption control, shorten the whole processing time length and improve the quality stability and the production efficiency of batch workpiece heat treatment. In order to achieve the above purpose, the present application mainly provides the following technical solutions: In one aspect of the present application, there is provided an air cooling system, including: heat treatment furnace; The inlet end of the circulating pipeline is communicated with the air outlet of the heat treatment furnace, the outlet end of the circulating pipeline is communicated with the air inlet of the heat treatment furnace through a heat exchanger, and the circulating pipeline is used for conveying the cold medium gas cooled by the heat exchanger and forming circulation of the cold medium gas; The bypass pipeline is used for conveying hot medium gas which is not cooled by the heat exchanger, so that the hot medium gas is mixed with the cold medium gas in the circulation pipeline, and a temperature control valve is arranged on the bypass pipeline; the first temperature measuring element is arranged at the air cooling outlet of the circulating pipeline and is used for detecting the medium gas temperature after the cold medium gas and the hot medium gas are mixed; the first temperature control unit is pre-stored with a cooling process curve and is respectively connected with the first temperature measuring element and the temperature control valve, and the first temperature control unit is used