Horizontal vacuum furnace with uniform heating function

Abstract

The invention discloses a horizontal vacuum furnace with a uniform heating function, and relates to the technical field of vacuum furnaces, the horizontal vacuum furnace comprises a furnace body, a furnace door, a vacuum system, an atmosphere panel, a cooling water system, a pneumatic system, a circulating system, a detecting and adjusting system and a base, the furnace door is hinged to the furnace body, the vacuum system is communicated with the furnace body, the atmosphere panel is connected with the furnace body, and the cooling water system is connected with the base. The atmosphere panel is used for controlling the gas environment in the furnace body, the cooling water system is communicated with the furnace body, the pneumatic system is used for controlling opening and closing of the furnace door, the circulating system is connected with the furnace body and achieves uniform heating through forced gas circulation, and the detecting and adjusting system is connected with the furnace body and used for guaranteeing the uniformity of the temperature in the furnace body. The base is fixedly connected with the furnace body; in the heating process, the temperature of all positions in the furnace body is detected through the detecting and adjusting system, the positions where the temperature is not uniform in the furnace body are adjusted, and therefore it is guaranteed that the temperature of all positions in the furnace body is kept consistent.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum furnaces, in particular to a horizontal vacuum furnace with a uniform heating function. Background Art

[0002] As heat treatment equipment, horizontal vacuum furnaces are widely used in oxygen-free tempering processes for workpieces. However, existing technologies still have significant drawbacks: Insufficient temperature uniformity: Traditional furnaces rely on natural convection or simple fan circulation, resulting in uneven distribution of hot air flow. Hot and cold zones are easily formed in the furnace, leading to large differences in the heating of the workpieces. This is especially true for large-sized or complex-structured workpieces, which are prone to quality problems such as uneven hardness and deformation.

[0003] Poor reliability of high-temperature sensing: Conventional electronic temperature sensors (such as thermocouples and resistance thermometers) are prone to drift or failure in long-term high-temperature environments and require frequent calibration or even replacement, which not only increases maintenance costs but also directly affects temperature control accuracy due to measurement inaccuracies.

[0004] Energy consumption and efficiency bottlenecks: To compensate for uneven temperatures, it is often necessary to extend the heating time or increase the overall furnace temperature, resulting in energy waste. At the same time, the lack of zoned temperature control capabilities makes it impossible to accurately intervene in local overheating or overcooling areas. The cooling system often needs to operate across the entire area, further increasing energy consumption. Summary of the Invention

[0005] The object of the present invention is to provide a horizontal vacuum furnace with a uniform heating function to solve the problems raised in the prior art.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a horizontal vacuum furnace includes a furnace body, a furnace door, a vacuum system, an atmosphere panel, a cooling water system, a pneumatic system, a circulation system, a detection and adjustment system and a base. The furnace door is hinged to the furnace body, the vacuum system is connected to the furnace body, the atmosphere panel is connected to the furnace body, the atmosphere panel is used to control the gas environment inside the furnace body, the cooling water system is connected to the furnace body, the pneumatic system is used to control the opening and closing of the furnace door, the circulation system is connected to the furnace body, the circulation system achieves uniform heating through forced gas circulation, the detection and adjustment system is connected to the furnace body, the detection and adjustment system is used to ensure the uniformity of the temperature inside the furnace body, and the base is firmly connected to the furnace body.

[0007] The base is placed on the ground to provide stable support for the vacuum furnace. The horizontal vacuum furnace is used to temper the workpiece. When performing the tempering operation, the workpiece is first placed in the furnace body and the furnace door is closed. The interior of the furnace body is then evacuated through the vacuum system to ensure an oxygen-free environment inside the furnace body, and inert gas is added to the furnace body through the atmosphere panel. The workpiece in the furnace body is then heated, and the inert gas is forced to circulate in the furnace body through the circulation system, thereby promoting the circulation of hot air flow in the furnace body. In addition, during heating, the temperature of various parts of the furnace body is detected by the detection and adjustment system, and the positions with uneven temperature in the furnace body are adjusted to ensure that the temperature of the furnace body remains consistent.

[0008] Furthermore, a heater is provided in the furnace body, which is used to heat the workpiece in the furnace body. The main function of the cooling water system is to control and take away the heat generated during the operation of the vacuum furnace to ensure that key components operate at a safe temperature.

[0009] The heater heats the workpiece in the furnace by means of thermal radiation. The heat generated by heating the workpiece will increase the temperature of the furnace shell due to heat conduction. Excessive temperature will cause the furnace body to deform and reduce its sealing. The cooling water system can remove heat through a water-cooling jacket or coil around the furnace body to maintain the furnace body at a safe temperature.

[0010] Furthermore, the detection and adjustment system includes a fixed box, a detection component and an adjustment fan. Several partitions and adjustment channels are provided in the furnace body. An annular flow channel is formed between the several partitions. The annular flow channel and the adjustment flow channel cooperate to make the hot air flow in the furnace body flow in a circular shape. The fixed box is tightly connected to the furnace body. The fixed box is located in the adjustment flow channel. An air inlet is provided in the fixed box. The detection component is installed at the air inlet. The adjustment fan is tightly connected to the inner wall of the air inlet.

[0011] The fixed box is fixed in the regulating flow channel to provide support for the detection and regulation system. When the vacuum furnace is working, the regulating fan is started, and the regulating fan forms a negative pressure at the air inlet, thereby sucking in the hot air flow from the inlet of the regulating flow channel and discharging it through the outlet of the regulating flow channel. An annular flow channel is then formed between several partitions to guide the outflowing hot air flow, so that the hot air flow flows in a circular manner along several annular flow channels. The hot air flow that separates the annular flow forms several annular heating areas in the furnace body. When the detection component detects that the hot air flow temperature in a certain area has changed, the hot air flow temperature in this area is adjusted by the corresponding component to keep the temperature uniform everywhere.

[0012] Furthermore, an exhaust flow channel, a heating flow channel and a cooling flow channel are further provided in the fixed box. Regulating valves are provided at the inlets of the exhaust flow channel, the heating flow channel and the cooling flow channel. The heating flow channel and the cooling flow channel are symmetrically arranged on both sides of the exhaust flow channel. When the hot gas temperature is suitable: the air inlet is connected to the exhaust flow channel; When the hot gas temperature is low: the air inlet is connected to the heating flow channel; When the hot air temperature is high: the air inlet is connected to the cooling channel.

[0013] The regulating valve can automatically control the opening and closing according to the temperature data detected by the detection component. When the hot gas temperature is suitable, the regulating valve located at the exhaust flow channel opens, and the airflow flows into the exhaust flow channel along the air inlet and then flows out from the regulating flow channel; when the hot gas temperature is low, the regulating valve located at the heating flow channel opens, and the airflow flows into the heating flow channel along the air inlet for heating treatment; when the hot gas temperature is high, the regulating valve located at the cooling flow channel opens, and the airflow flows into the cooling flow channel along the air inlet for cooling treatment; that is, the automatic adjustment of the hot air flow temperature in the furnace body is achieved through the switchable flow channel, so that the temperature of each part of the furnace body is kept consistent.

[0014] Furthermore, a heating wire is provided in the temperature-increasing flow channel, a cooling pipe is provided around the outside of the temperature-decreasing flow channel, and the cooling pipe is externally connected to a cooling water system.

[0015] The heating channel heats the cooler airflow through the heating wire, and the cooling channel cools the higher temperature airflow through the cooling water in the cooling pipe.

[0016] Furthermore, the detection component includes a bimetallic strip, a first telescopic rod, a connecting ball, a second telescopic rod, a slip ring and a resistor rod. One end of the bimetallic strip is fastened to the inner wall of the air inlet, the other end of the bimetallic strip is hinged to the first telescopic rod, the end of the first telescopic rod away from the bimetallic strip is fastened to the connecting ball, the connecting ball is rotatably connected to the fixed box, one end of the second telescopic rod is fastened to the connecting ball, the other end of the second telescopic rod is hinged to the slip ring, a movable groove is provided in the fixed box, the resistor rod is fastened to the inner wall of the movable groove, the slip ring is slidably connected to the resistor rod, the resistor rod and the slip ring are externally connected to a detection system, and the detection system is used to detect the resistance between the resistor rod and the slip ring.

[0017] Furthermore, the bimetallic strip is made by firmly bonding together two layers of metal sheets of different types, the two layers of metal sheets having different coefficients of thermal expansion; When the temperature rises: the bimetallic strip bends towards the metal strip with a lower thermal expansion coefficient.

[0018] Due to the high temperature inside a vacuum furnace, resistance thermometers may experience changes in their grain structure at high temperatures, causing a shift in the relationship between resistance and temperature. This drift is generally irreversible and requires regular calibration. This means that existing temperature sensors will inevitably experience a loss in accuracy when used for extended periods in the high-temperature environment of a vacuum furnace, resulting in inaccurate temperature measurements. The present invention utilizes a bimetallic strip composed of two layers of metal sheets with different thermal expansion coefficients to detect temperature changes. The bimetallic strip has excellent heat resistance and can be used for extended periods. Furthermore, the resistor rod is located in a movable groove, away from heat sources, which reduces the effect of temperature on the resistance value. When the temperature in a certain area of ​​the furnace is high, the bimetallic strip is heated, causing it to bend toward the metal sheet with the lower thermal expansion coefficient. This causes the first telescopic rod to deflect to one side along the connecting ball, thereby causing the second telescopic rod to deflect to the other side by a certain angle. This causes the slip ring to move a certain distance along the resistor rod, increasing the length of the resistor rod connected to the detection system and increasing the resistance value detected by the detection system. Furthermore, as the temperature increases, the bimetallic strip bends more and the slip ring moves further along the resistor rod. Consequently, the detection system detects a greater resistance on the resistor rod as the temperature increases.

[0019] Furthermore, the length of the second telescopic rod is greater than that of the first telescopic rod.

[0020] Since the deformation of the bimetallic strip due to heat is small, a lever system is formed by providing a first telescopic rod and a second telescopic rod of different lengths to amplify the deformation of the bimetallic strip, thereby facilitating detection.

[0021] Furthermore, the resistance rod is divided into E zone, F zone and G zone along the moving direction of the slip ring; When the slip ring is located in area E, the temperature of the hot air flow is lower; When the slip ring is located in area F, the temperature of the thermal airflow is moderate; When the slip ring is located in area G, the temperature of the hot air flow is higher.

[0022] The zones on the resistor rod correspond to the opening and closing of the regulating valves at different positions. When the slip ring is located in zone E, the temperature of the hot air flow is low, and the regulating valve at the heating flow channel is opened; when the slip ring is located in zone F, the temperature of the hot air flow is moderate, and the regulating valve at the exhaust flow channel is opened; when the slip ring is located in zone G, the temperature of the hot air flow is high, and the regulating valve at the cooling flow channel is opened. That is, by zoning the resistor rods, the accuracy of controlling the hot air flow temperature is improved.

[0023] Furthermore, the circulation system includes a drive motor and circulation blades. The drive motor is firmly connected to the furnace body, and the output end of the drive motor is transmission-connected to the circulation blades.

[0024] The driving motor is the main power source of the circulation system. The circulating fan blades are driven by the driving motor to form a circulation of hot air flow in the furnace body, thereby promoting heating uniformity, reducing energy consumption and improving environmental protection.

[0025] Compared with the prior art, the present invention has the following beneficial effects: 1. A forced gas circulation system accelerates the flow of inert gas within the furnace. Combined with a unique detection and regulation system featuring bimetallic temperature sensing, lever amplification, and resistance rod zone detection, this system enables real-time, zoned, and dynamic temperature regulation of the hot air flow within each zone of the furnace, heating low-temperature areas and cooling high-temperature areas. This intelligent temperature control mechanism ensures temperature uniformity within the furnace, significantly improving heating consistency and process quality during workpiece tempering.

[0026] 2. The detection component utilizes a high-temperature-resistant bimetallic mechanical sensor combined with a resistance displacement detection scheme, effectively avoiding the drift problem of traditional electronic sensors at high temperatures, resulting in more reliable measurements and a longer lifespan. A lever mechanism amplifies minute temperature changes, and the resistor rod's partitioned design enables precise temperature detection. The system automatically controls the regulating valve to switch airflow paths, providing a fast and precise response. The heating wire or cooling water is activated only when needed, significantly reducing ineffective energy consumption and improving operational efficiency and cost-effectiveness.

[0027] 3. The cooling water system continuously removes heat generated during furnace operation, effectively preventing deformation of the furnace shell due to overheating and ensuring the integrity of the furnace structure and vacuum sealing performance. At the same time, the durable bimetallic temperature sensing element and the resistance rod detection design away from the heat source reduce the wear of the detection components in high-temperature environments, thereby improving the long-term operational stability and service life of the entire vacuum furnace system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 AA sectional view; Figure 3 It is a schematic diagram of the furnace structure of the present invention; Figure 4 It is a partial cross-sectional view of the furnace body of the present invention; Figure 5 Partial cross-sectional view of the detection and adjustment system; Figure 6 A schematic diagram of the detection component; Figure 7 for Figure 6 A partial enlarged view of point B; Figure 8 It is a schematic diagram of the action of the detection component; Figure 9 for Figure 8A partial enlarged view of point C.

[0029] In the figure: 1. Furnace body; 11. Partition; 12. Adjustment channel; 2. Furnace door; 3. Vacuum system; 4. Atmosphere panel; 5. Cooling water system; 6. Pneumatic system; 7. Circulation system; 71. Drive motor; 72. Circulation fan blade; 8. Detection and adjustment system; 81. Fixing box; 811. Air inlet; 812. Exhaust channel; 813. Heating channel; 814. Cooling channel; 815. Movable groove; 82. Detection component; 821. Bimetallic strip; 822. First telescopic rod; 823. Connecting ball; 824. Second telescopic rod; 825. Slip ring; 826. Resistance rod; 83. Adjustment fan; 84. Regulating valve; 85. Heating wire; 86. Cooling pipe; 9. Base. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] Example: Figures 1-9 As shown, the present invention provides a technical solution for a horizontal vacuum furnace with a uniform heating function. The horizontal vacuum furnace includes a furnace body 1, a furnace door 2, a vacuum system 3, an atmosphere panel 4, a cooling water system 5, a pneumatic system 6, a circulation system 7, a detection and adjustment system 8 and a base 9. The furnace door 2 is hinged to the furnace body 1, the vacuum system 3 is connected to the furnace body 1, the atmosphere panel 4 is connected to the furnace body 1, the atmosphere panel 4 is used to control the gas environment in the furnace body 1, the cooling water system 5 is connected to the furnace body 1, the pneumatic system 6 is used to control the opening and closing of the furnace door 2, the circulation system 7 is connected to the furnace body 1, the circulation system 7 achieves uniform heating by forced gas circulation, the detection and adjustment system 8 is connected to the furnace body 1, the detection and adjustment system 8 is used to ensure the uniformity of the temperature in the furnace body 1, and the base 9 is firmly connected to the furnace body 1.

[0032] The base 9 is placed on the ground to provide stable support for the vacuum furnace. The horizontal vacuum furnace is used to temper the workpiece. When performing the tempering operation, the workpiece is first placed in the furnace body 1 and the furnace door 2 is closed. The interior of the furnace body 1 is then evacuated through the vacuum system 3 to ensure an oxygen-free environment in the furnace body 1, and inert gas is added to the furnace body 1 through the atmosphere panel 4. The workpiece in the furnace body 1 is then heated, and the inert gas is forced to circulate in the furnace body 1 through the circulation system 7, thereby promoting the circulation of hot air flow in the furnace body 1; in addition, during heating, the temperature of various parts of the furnace body 1 is detected by the detection and adjustment system 8, and the positions with uneven temperature in the furnace body 1 are adjusted to ensure that the temperature of various parts of the furnace body 1 remains consistent.

[0033] A heater is provided in the furnace body 1 for heating the workpieces in the furnace body 1. The cooling water system 5 is mainly used to control and remove the heat generated during the operation of the vacuum furnace to ensure that key components operate at a safe temperature.

[0034] The heater heats the workpiece in the furnace body 1 by means of thermal radiation. The heat generated by heating the workpiece will increase the temperature of the outer shell of the furnace body 1 due to heat conduction. Excessive temperature will cause the furnace body 1 to deform and reduce its sealing performance. The cooling water system 5 can carry away the heat by surrounding the furnace body 1 with a water-cooling jacket or coil to maintain the furnace body 1 at a safe temperature.

[0035] The detection and adjustment system 8 includes a fixed box 81, a detection component 82 and an adjustment fan 83. Several partitions 11 and adjustment channels 12 are provided in the furnace body 1. An annular channel is formed between the several partitions 11. The annular channel and the adjustment channel 12 cooperate to make the hot air flow in the furnace body 1 flow in a circular shape. The fixed box 81 is tightly connected to the furnace body 1. The fixed box 81 is located in the adjustment channel 12. An air inlet 811 is provided in the fixed box 81. The detection component 82 is installed at the air inlet 811. The adjustment fan 83 is tightly connected to the inner wall of the air inlet 811.

[0036] The fixed box 81 is fixed in the regulating flow channel 12 to provide support for the detection and adjustment system 8. When the vacuum furnace is working, the regulating fan 83 is started, and the regulating fan 83 forms a negative pressure at the air inlet 811, thereby sucking in the hot air flow from the inlet of the regulating flow channel 12 and discharging it through the outlet of the regulating flow channel 12, and then forming an annular flow channel between several partitions 11 to guide the outflowing hot air flow, so that the hot air flow flows in a circular manner along the several annular flow channels, and the hot air flow that separates the annular flow is separated to form several annular heating areas in the furnace body 1. When the detection component 82 detects that the temperature of the hot air flow in a certain area has changed, the temperature of the hot air flow in this area is adjusted by the corresponding component to keep the temperature uniform everywhere.

[0037] The fixed box 81 is further provided with an exhaust flow channel 812, a heating flow channel 813 and a cooling flow channel 814. Regulating valves 84 are provided at the inlets of the exhaust flow channel 812, the heating flow channel 813 and the cooling flow channel 814. The heating flow channel 813 and the cooling flow channel 814 are symmetrically arranged on both sides of the exhaust flow channel 812. When the hot air temperature is suitable: the air inlet 811 is connected to the exhaust flow channel 812; When the hot air temperature is low: the air inlet 811 is connected to the temperature-increasing flow channel 813; When the hot air temperature is high, the air inlet 811 is connected to the cooling channel 814 .

[0038] The regulating valve 84 can be automatically controlled to open and close according to the temperature data detected by the detection component 82. When the hot gas temperature is suitable, the regulating valve 84 located at the exhaust flow channel 812 is opened, and the airflow flows into the exhaust flow channel 812 along the air inlet 811, and then flows out from the regulating flow channel 12; when the hot gas temperature is low, the regulating valve 84 located at the heating flow channel 813 is opened, and the airflow flows into the heating flow channel 813 along the air inlet 811 for heating treatment; when the hot gas temperature is high, the regulating valve 84 located at the cooling flow channel 814 is opened, and the airflow flows into the cooling flow channel 814 along the air inlet 811 for cooling treatment; that is, the automatic adjustment of the hot air flow temperature in the furnace body 1 is achieved through the switchable flow channel, so that the temperature of each place in the furnace body 1 is kept consistent.

[0039] A heating wire 85 is provided in the temperature-increasing flow channel 813 , and a cooling pipe 86 is provided around the outside of the temperature-decreasing flow channel 814 . The cooling pipe 86 is externally connected to the cooling water system 5 .

[0040] The heating channel 813 heats the cooler airflow through the heating wire 85 , and the cooling channel 814 cools the higher temperature airflow through the cooling water in the cooling pipe 86 .

[0041] The detection assembly 82 includes a bimetallic strip 821, a first telescopic rod 822, a connecting ball 823, a second telescopic rod 824, a slip ring 825 and a resistor rod 826. One end of the bimetallic strip 821 is fastened to the inner wall of the air inlet 811, and the other end of the bimetallic strip 821 is hinged to the first telescopic rod 822. The end of the first telescopic rod 822 away from the bimetallic strip 821 is fastened to the connecting ball 823, and the connecting ball 823 is rotatably connected to the fixed box 81. One end of the second telescopic rod 824 is fastened to the connecting ball 823, and the other end of the second telescopic rod 824 is hinged to the slip ring 825. A movable groove 815 is provided in the fixed box 81. The resistor rod 826 is fastened to the inner wall of the movable groove 815. The slip ring 825 is slidably connected to the resistor rod 826. The resistor rod 826 and the slip ring 825 are externally connected to a detection system, and the detection system is used to detect the resistance between the resistor rod 826 and the slip ring 825.

[0042] The bimetallic strip 821 is made of two layers of different types of metal sheets firmly bonded together, and the two layers of metal sheets have different thermal expansion coefficients; When the temperature rises, the bimetallic strip 821 bends toward the metal strip on the side with a lower thermal expansion coefficient.

[0043] Since the temperature inside the vacuum furnace is relatively high, the grain structure of the resistance thermometer may change at high temperatures, causing the relationship between its resistance and temperature to shift. This drift is usually irreversible and requires regular calibration. In other words, the accuracy of existing temperature sensors will inevitably decrease when used in the high temperature environment of a vacuum furnace for a long time, resulting in inaccurate temperature detection. The present application detects temperature changes through a bimetallic strip 821 composed of two layers of metal sheets with different thermal expansion coefficients. The bimetallic strip 821 has good heat resistance and can be used for a long time. In addition, the resistance rod 826 is in the movable groove 815, away from the heat source, which can reduce the effect of temperature on the resistance value. Influence: When the temperature of a certain area in the furnace body 1 is high, the bimetallic strip 821 is heated, thereby bending toward the metal sheet on the side with a lower thermal expansion coefficient, and driving the first telescopic rod 822 to deflect to one side along the connecting ball 823, thereby driving the second telescopic rod 824 to deflect to the other side by a certain angle, so that the slip ring 825 moves a certain distance along the resistor rod 826, the length of the resistor rod 826 connected to the detection system becomes longer, and the resistance value detected by the detection system is greater; and the higher the temperature, the greater the bending degree of the bimetallic strip 821, and the greater the distance the slip ring 825 moves along the resistor rod 826, that is, the greater the resistance value on the resistor rod 826 detected by the detection system is, the higher the temperature.

[0044] The second telescopic rod 824 is longer than the first telescopic rod 822 .

[0045] Since the deformation of the bimetallic strip 821 due to heat is small, a lever system is formed by providing a first telescopic rod 822 and a second telescopic rod 824 of different lengths to amplify the deformation of the bimetallic strip 821, thereby facilitating detection.

[0046] The resistor rod 826 is divided into E zone, F zone and G zone in the moving direction of the slip ring 825; When the slip ring 825 is located in the E region, the temperature of the hot air flow is low; When the slip ring 825 is located in the F region, the temperature of the thermal airflow is moderate; When the slip ring 825 is located in the G region, the temperature of the hot air flow is higher.

[0047] The zones on the resistor rod 826 correspond to the opening and closing of the regulating valve 84 at different positions. When the slip ring 825 is located in zone E, the temperature of the hot air flow is low, and the regulating valve 84 at the heating flow channel 813 is opened; when the slip ring 825 is located in zone F, the temperature of the hot air flow is moderate, and the regulating valve 84 at the exhaust flow channel 812 is opened; when the slip ring 825 is located in zone G, the temperature of the hot air flow is high, and the regulating valve 84 at the cooling flow channel 814 is opened. That is, by zoning the resistor rod 826, the accuracy of controlling the temperature of the hot air flow is improved.

[0048] The circulation system 7 includes a driving motor 71 and a circulation fan 72 . The driving motor 71 is firmly connected to the furnace body 1 , and an output end of the driving motor 71 is transmission-connected to the circulation fan 72 .

[0049] The driving motor 71 is the main power source of the circulation system 7. Driven by the driving motor 71, the circulating blades 72 form a circulation of hot air flow in the furnace body 1, thereby promoting heating uniformity, reducing energy consumption and improving environmental protection.

[0050] The working principle of the present invention is as follows: when the horizontal vacuum furnace is working, the workpiece is first placed in the furnace body 1 and the furnace door 2 is closed. The vacuum system 3 is used to evacuate the workpiece to create an oxygen-free environment, and then an inert gas is injected through the atmosphere panel 4. Subsequently, the heater heats the workpiece by heat radiation. At the same time, the driving motor 71 in the circulation system 7 drives the circulation fan blades 72 to rotate, forcing the inert gas to circulate in the furnace body and promote heat distribution. During this process, the detection and adjustment system 8 detects the air flow temperature in each area through the bimetallic strip 821, and its deformation is composed of the first telescopic rod 822, the second telescopic rod 824 and the connecting ball 823. After the lever system is amplified, it is converted into the displacement of the slip ring 825 on the resistor rod 826. The temperature is accurately judged by the change of the resistance value, that is, low temperature in area E, moderate temperature in area F, and high temperature in area G. Based on this, the regulating valve 84 is automatically controlled to switch the airflow path. When the temperature is moderate, the airflow is directly circulated through the exhaust flow channel 812; when the temperature is too low, the airflow is introduced into the heating flow channel 813 to be heated by the heating wire; when the temperature is too high, the airflow is introduced into the cooling flow channel 814 to be cooled by the cooling pipe, thereby dynamically adjusting the airflow temperature in each area to ensure highly uniform temperature in the furnace; in addition, the cooling water system continuously takes away the heat from the furnace body to maintain structural safety.

[0051] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A horizontal vacuum furnace with uniform heating function, characterized by: The horizontal vacuum furnace comprises a furnace body (1), a furnace door (2), a vacuum system (3), an atmosphere panel (4), a cooling water system (5), a pneumatic system (6), a circulation system (7), a detection and adjustment system (8) and a base (9), wherein the furnace door (2) is hinged to the furnace body (1), the vacuum system (3) is communicated with the furnace body (1), the atmosphere panel (4) is connected to the furnace body (1), the atmosphere panel (4) is used to control the gas environment in the furnace body (1), the cooling water system (5) is communicated with the furnace body (1), the pneumatic system (6) is used to control the opening and closing of the furnace door (2), the circulation system (7) is connected to the furnace body (1), the circulation system (7) realizes uniform heating by forced gas circulation, the detection and adjustment system (8) is connected to the furnace body (1), the detection and adjustment system (8) is used to ensure the uniformity of temperature in the furnace body (1), and the base (9) is firmly connected to the furnace body (1).

2. The horizontal vacuum furnace with uniform heating function according to claim 1, characterized in that: A heater is provided in the furnace body (1), and the heater is used to heat the workpiece in the furnace body (1). The cooling water system (5) mainly controls and removes the heat generated during the operation of the vacuum furnace, ensuring that key components operate at a safe temperature.

3. The horizontal vacuum furnace with uniform heating function according to claim 1, characterized in that: The detection and adjustment system (8) includes a fixed box (81), a detection component (82) and an adjustment fan (83). A plurality of partitions (11) and an adjustment channel (12) are provided in the furnace body (1). An annular channel is formed between the plurality of partitions (11). The annular channel cooperates with the adjustment channel (12) to enable the hot air flow in the furnace body (1) to flow in an annular manner. The fixed box (81) is firmly connected to the furnace body (1). The fixed box (81) is located in the adjustment channel (12). An air inlet (811) is provided in the fixed box (81). The detection component (82) is installed at the air inlet (811). The adjustment fan (83) is firmly connected to the inner wall of the air inlet (811).

4. The horizontal vacuum furnace with uniform heating function according to claim 3, characterized in that: An exhaust flow channel (812), a heating flow channel (813), and a cooling flow channel (814) are further provided in the fixing box (81). Regulating valves (84) are provided at the inlets of the exhaust flow channel (812), the heating flow channel (813), and the cooling flow channel (814). The heating flow channel (813) and the cooling flow channel (814) are symmetrically arranged on both sides of the exhaust flow channel (812). When the hot air temperature is suitable: the air inlet (811) is communicated with the exhaust flow channel (812); When the hot air temperature is low: the air inlet (811) is connected to the temperature-increasing flow channel (813); When the hot air temperature is high: the air inlet (811) is connected to the cooling channel (814).

5. The horizontal vacuum furnace with uniform heating function according to claim 4, characterized in that: A heating wire (85) is provided in the temperature-increasing flow channel (813), and a cooling pipe (86) is provided around the outside of the temperature-decreasing flow channel (814). The cooling pipe (86) is externally connected to a cooling water system (5).

6. The horizontal vacuum furnace with uniform heating function according to claim 5, characterized in that: The detection assembly (82) includes a bimetallic strip (821), a first telescopic rod (822), a connecting ball (823), a second telescopic rod (824), a slip ring (825) and a resistance rod (826). One end of the bimetallic strip (821) is fastened to the inner wall of the air inlet (811), and the other end of the bimetallic strip (821) is hinged to the first telescopic rod (822). The end of the first telescopic rod (822) away from the bimetallic strip (821) is fastened to the connecting ball (823), and the connecting ball (823) is rotated with the fixing box (81). The second telescopic rod (824) is connected to the connecting ball (823) in a dynamic manner, and one end of the second telescopic rod (824) is fastened to the connecting ball (823), and the other end of the second telescopic rod (824) is hinged to the slip ring (825). A movable groove (815) is provided in the fixed box (81), and the resistance rod (826) is fastened to the inner wall of the movable groove (815). The slip ring (825) is slidably connected to the resistance rod (826). The resistance rod (826) and the slip ring (825) are externally connected to a detection system, and the detection system is used to detect the resistance between the resistance rod (826) and the slip ring (825).

7. The horizontal vacuum furnace with uniform heating function according to claim 6, characterized in that: The bimetallic sheet (821) is made of two layers of metal sheets of different types firmly bonded together, and the two layers of metal sheets have different thermal expansion coefficients; When the temperature rises, the bimetallic strip (821) bends toward the metal strip on the side with a lower thermal expansion coefficient.

8. The horizontal vacuum furnace with uniform heating function according to claim 6, characterized in that: The second telescopic rod (824) is longer than the first telescopic rod (822).

9. The horizontal vacuum furnace with uniform heating function according to claim 6, characterized in that: The resistance rod (826) is divided into an E zone, an F zone, and a G zone in sequence along the moving direction of the slip ring (825); When the slip ring (825) is located in the E region, the temperature of the hot air flow is lower; When the slip ring (825) is located in the F region, the temperature of the hot air flow is moderate; When the slip ring (825) is located in the G region, the temperature of the hot air flow is higher.

10. The horizontal vacuum furnace with uniform heating function according to claim 1, characterized in that: The circulation system (7) comprises a driving motor (71) and a circulation fan (72); the driving motor (71) is firmly connected to the furnace body (1); and the output end of the driving motor (71) is transmission-connected to the circulation fan (72).

Images