CN113789436A

CN113789436A - Workpiece heating and circulating system in atmospheric environment

Info

Publication number: CN113789436A
Application number: CN202111196315.4A
Authority: CN
Inventors: 马贺; 徐婷婷; 王树伟; 郭赛南; 吴庆民; 韩彦章
Original assignee: Aifake Vacuum Technology Shenyang Co ltd
Current assignee: Aifake Vacuum Technology Shenyang Co ltd
Priority date: 2021-10-14
Filing date: 2021-10-14
Publication date: 2021-12-14

Abstract

The invention relates to a workpiece heating circulation system in an atmospheric environment, wherein a heater is fixed on the inner surface of a cavity, the heater is an armored or banded resistance heater, and the upper part and the lower part of the left side and the right side of the cavity are both provided with openings for installing a fan and a pipeline; the fan and the pipeline are symmetrically arranged on the left side and the right side of the cavity, and a frequency converter is further arranged on one side of the fan; four pipelines are arranged in the cavity, each pipeline is provided with a fan and a frequency converter, each heater, one pipeline and the workpiece form a set of heating circulation system, and each set of heating circulation system forms a square loop; the workpiece heating circulation system in the atmospheric environment can realize the function of heating workpieces in the atmospheric environment, and the temperature uniformity of the workpieces can be kept through the workpiece heating circulation structure in the atmospheric environment, so that different process requirements are met.

Description

Workpiece heating and circulating system in atmospheric environment

Technical Field

The invention belongs to the technical field of heating, and particularly relates to a workpiece heating circulation system in an atmospheric environment.

Background

In the heating technical field, the conventional heating of a workpiece is generally carried out under a vacuum condition, and during heat treatment, particularly in a quenching process of the workpiece, the volume of each part of the section of the workpiece expands and contracts unevenly due to the temperature difference caused by the heating and cooling speed inconsistency of each part of the section of the workpiece, the anisochronogenesis of the structure transformation and the like, so that the structure stress and the thermal stress caused by the temperature difference between the inside and the outside of the workpiece are caused. Distortion is caused when the internal stress exceeds the yield limit of the workpiece. The heat transfer in the vacuum state is single radiation heat transfer, the temperature rise is slow, the temperature difference between the surface of the workpiece and the core is small, the thermal stress is small, the heating rate needs to be reduced at a low temperature stage, and the slow heating of the core is avoided.

However, when the heating temperature is lower than the oxidation temperature of the material of the workpiece, the heating cost is lower in the atmospheric state, but the heating is affected by factors such as air convection and heat conduction in the atmospheric state, so that the heated workpiece inevitably has the phenomena of high upper temperature and low lower temperature, the heated workpiece cannot be uniformly heated, and the process requirements cannot be met.

Disclosure of Invention

The application provides a work piece heating cycle system under atmospheric environment to solve current work piece and can't realize the even problem of temperature in heating process.

In order to achieve the purpose, the invention relates to a workpiece heating circulation system in an atmospheric environment, which comprises a cavity and is characterized in that: a heater is fixed on the inner side of the cavity, openings are formed in the upper portion and the lower portion of the left side and the right side of the cavity and used for installing pipelines, and fans are arranged on the pipelines; the fan and the pipeline are symmetrically arranged on the left side and the right side of the cavity, and a frequency converter is further arranged on one side of the fan.

Preferably, the heaters are positioned in the cavity, the number of the heaters is two, and the heaters are symmetrically arranged on two sides in the cavity.

Preferably, four pipelines are arranged in the cavity, and each pipeline is provided with a fan and a frequency converter.

Preferably, the material of the outer wall of the pipeline is zirconium-containing alumina.

Preferably, the pipelines are uniformly provided with temperature sensors, and the number of the temperature sensors is five.

Preferably, temperature sensors are uniformly arranged on the pipeline, and the number of the temperature sensors is nine.

The invention has the advantages and beneficial effects that: the workpiece heating circulation system under the atmospheric environment comprises a cavity, wherein a heater is arranged in the cavity to realize the purpose of heating the workpiece; the effect of uniformly heating the workpiece is achieved by arranging the fan and the frequency converter on the pipeline; the temperature sensors are uniformly arranged on the pipeline, so that the temperature change of the pipeline is controlled at any time, when the temperature is too high, the temperature sensors send signals to the frequency converter, and the frequency converter adjusts the air volume to keep the temperature of the cavity uniform; the workpiece heating circulation structure protected by the invention can realize the purpose of heating the workpiece in the atmospheric environment and ensuring the uniformity of the temperature of the workpiece through the circulation system; the frequency converter can be used for controlling the rotating speed of the fan, so that the speed of hot air circulation is adjusted, and the temperature of a workpiece meets different technological requirements.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1;

the reference numbers are as follows: 1. heater 2, cavity 3, fan 4, pipeline 5, converter 6, work piece.

Detailed Description

The invention relates to a workpiece heating circulation system in an atmospheric environment, which can meet the condition of heating a workpiece in the atmospheric environment, and when the workpiece is heated in the atmospheric environment, the workpiece is influenced by factors such as air convection, heat conduction and the like, so that the heated workpiece inevitably has the phenomena of high upper temperature and low lower temperature, and the heated workpiece cannot be uniformly heated.

The first embodiment is as follows: referring to fig. 1, the invention relates to a workpiece heating circulation system in an atmospheric environment, which comprises a cavity 2, wherein a heater 1 is fixed on the inner surface of the cavity, the heater is an armored or banded resistance heater, four heaters are arranged in the cavity, any two heaters are symmetrically arranged relative to a workpiece, openings are formed in the upper part and the lower part of the left side and the right side of the cavity and used for installing a fan 3 and a pipeline 4, and the caliber of the pipeline 4 is 100mm-400 mm; the fan 3 and the pipeline 4 are symmetrically arranged on the left side and the right side of the cavity, the frequency converter 5 is further arranged on one side of the fan, four pipelines are arranged in the cavity, each pipeline is provided with one fan and one frequency converter, each heater, one pipeline and a workpiece form one set of heating circulation system, and each set of heating circulation system forms a square loop.

Referring to fig. 2, four sets of heating circulation systems may be disposed in the cavity 2, and are respectively located on four sides of the cavity, the workpiece is located in the middle of the cavity, and the four sets of heating circulation systems are used to uniformly heat the workpiece, so that the temperature on the workpiece is kept uniform. When the workpiece needs to be heated, the heater in the cavity is electrified to heat the workpiece in the cavity, and the fan is started to circulate hot air at the upper part of the cavity through the pipeline to enter the lower part of the cavity. The hot air in the pipeline enters the pipeline from the bottom to the top of the workpiece, and is transferred to the bottom of the workpiece from top to bottom, and each pipeline and the workpiece form a circulation loop; the material of pipeline outer wall is zirconium-containing alumina, and zirconium-containing alumina parcel is at the skin of pipeline outer wall, and zirconium-containing alumina is insulation material, can reduce the heat dissipation of pipeline.

Be provided with inlet scoop and air exit on the fan 3, the pipeline passes inlet scoop and the air exit on the fan 3, inlet scoop upper portion trompil connecting line, air exit lower part trompil connecting line, and inlet scoop department pressure is less than atmospheric pressure, and air exit department pressure is higher than atmospheric pressure, and the air is by high-pressure department flow direction low pressure department, and hot-air flows to the top from the work piece bottom promptly for hot-air obtains the circulation in the pipeline.

The pipelines 4 are embedded at two sides of the cavity and are symmetrically arranged relative to the workpiece, the caliber range of the pipelines is 100mm-400mm, the caliber of the pipelines depends on the air quantity required by the heated workpiece, and when the heated workpiece needs larger air quantity, the pipelines with the caliber of 400mm are adopted; when the heated workpiece needs smaller air volume, a pipeline with the caliber of 100mm is adopted; besides the two pipeline calibers, the pipeline calibers can also be 200mm, 250mm, 300mm and other specifications; the hot air circulation direction in the pipeline is from top to bottom, when the hot air reaches the lower part of the pipeline, the fan positioned on one side of the lower part of the pipeline is adjusted through the frequency converter, the hot air enters from the air suction inlet of the fan and exits from the air outlet of the fan, the pressure difference determines the flow direction of the air in the pipeline as the pressure of the air outlet is higher than the atmospheric pressure, the hot air flows from the high pressure part to the low pressure part, namely the hot air flows to the top of the workpiece through the bottom of the workpiece and then flows into the pipeline, thereby forming a set of heating circulation system.

The frequency converter 5 controls the rotating speed of the fan, adjusts the speed of hot air circulation, the rotating speed of a motor driving the fan is positively correlated with the wind speed, namely the rotating speed of the motor is high, the wind speed is high, the rotating speed of the motor is low, the wind speed is low, the rotating speed of the motor is determined by the frequency, and the frequency converter is used for adjusting the frequency of the motor, so that the rotating speed of the motor of the fan is adjusted, the wind speed can be adjusted, and the temperature of a workpiece meets different technological requirements.

The invention also provides a workpiece heating circulation method in the atmospheric environment, which comprises the following steps:

s1: electrifying the heater in the cavity to enable the heater to start working and provide a heating effect for the workpiece; s2: starting the fan to circulate hot air at the upper part of the cavity through the pipeline to enter the lower part of the cavity, and repeatedly circulating the hot air in such a way to keep the surface temperature of the workpiece in the cavity uniform;

s3: the rotating speed of the fan is controlled at any time through the frequency converter, and the circulating speed of air in the pipeline is adjusted, so that the surface temperature of the workpiece in the cavity is kept uniform.

The gas medium in the atmospheric environment is air, the workpiece heating circulation system heats the workpiece in the cavity to form a circulation structure by electrifying the heater, and the fan is started to circularly stir the hot air in the cavity, so that the uniformity of the temperature in the cavity is controlled; the fans and the pipelines are symmetrically arranged on the left side and the right side of the cavity, the fans are positioned on the lower bottom side, or the left side or the right side of the cavity, and the number of the fans and the pipelines arranged on each side of the cavity is determined according to the length of the cavity. The cavity can be also internally provided with five or nine temperature sensors, the temperature sensors are positioned in the pipeline and can be uniformly arranged along the pipeline, at least one temperature sensor is arranged in the pipeline of each circulation loop, and a certain distance is kept between every two adjacent temperature sensors; the temperature sensor is used for controlling the heating temperature of the heater, when the temperature is too high, the temperature sensor sends a signal to the frequency converter, and the frequency converter adjusts the air volume to keep the temperature of the cavity uniform.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a work piece heating cycle system under atmospheric environment, includes the cavity, its characterized in that: a heater is fixed on the inner side of the cavity, openings are formed in the upper portion and the lower portion of the left side and the right side of the cavity and used for installing pipelines, and fans are arranged on the pipelines; the fan and the pipeline are symmetrically arranged on the left side and the right side of the cavity, and a frequency converter is further arranged on one side of the fan.

2. The atmospheric workpiece heating cycle system of claim 1, further comprising: the heater is positioned in the cavity, and the two sides in the cavity are symmetrically arranged.

3. An atmospheric workpiece heating cycle system as defined in claim 2, further comprising: four pipelines are arranged in the cavity, and each pipeline is provided with a fan and a frequency converter.

4. The atmospheric workpiece heating cycle system of claim 1, further comprising: the outer wall of the pipeline is made of zirconium-containing alumina.

5. The atmospheric workpiece heating cycle system of claim 4, further comprising: the caliber of the pipeline is 100mm-400 mm.

6. The atmospheric workpiece heating cycle system of claim 1, further comprising: temperature sensors are evenly arranged on the pipeline, and the number of the temperature sensors is five.

7. An atmospheric workpiece heating cycle system as defined in claim 6, further comprising: temperature sensors are uniformly arranged on the pipeline, and the number of the temperature sensors is nine.

8. A workpiece heating circulation method in an atmospheric environment is characterized in that: the method comprises the following steps:

s1: electrifying the heater in the cavity to enable the heater to start working and provide a heating effect for the workpiece;

s2: starting the fan to circulate hot air at the upper part of the cavity through the pipeline to enter the lower part of the cavity, and repeatedly circulating the hot air in such a way to keep the surface temperature of the workpiece in the cavity uniform;