Vacuum heat treatment equipment

Abstract

The vacuum heat treatment equipment comprises a furnace body, a heat preservation box and a heat exchanger, the periphery of the furnace body is covered with the heat preservation box, an outer cold air duct is formed between the heat preservation box and the furnace body, and the outer cold air duct communicates with the outside; external normal-temperature airflow flows through the outer surface of the furnace body along the outer cold air duct, the normal-temperature airflow and the outer surface of the furnace body are subjected to forced convection heat dissipation, heat of the outer surface of the furnace body is taken away in an external air cooling mode, and the outside of the furnace body is cooled. The heat exchanger is communicated with an inner cavity of the furnace body through a heat exchange pipeline, high-temperature airflow in the furnace body flows into the heat exchanger along the heat exchange pipeline and becomes low-temperature airflow after heat exchange, and the low-temperature airflow flows into the furnace body along the heat exchange pipeline to cool the interior of the furnace body in a circulating heat exchange mode. The mode that external air cooling and circulating heat exchange are combined is adopted, the exterior and the interior of the furnace body are cooled at the same time, the cooling time of the furnace body is effectively shortened, the cooling speed of the furnace body is high, and the cooling efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum heat treatment, in particular to a vacuum heat treatment device. Background Art

[0002] Vacuum heat treatment technology is an innovative combination of vacuum technology and traditional heat treatment processes. By establishing a controllable vacuum environment and completely isolating oxygen, it effectively solves surface defects such as oxidation and decarburization in traditional heat treatment, ensuring that the workpiece surface remains bright and clean. It also achieves targeted regulation of the material microstructure through precise control of temperature and cooling rate, improving key indicators such as the workpiece's hardness, wear resistance, and fatigue strength. It is widely used in fields such as aerospace, automotive manufacturing, and the electronics industry.

[0003] Vacuum heat treatment technology must be implemented through a vacuum heat treatment furnace. The working principle of a vacuum heat treatment furnace includes the vacuum preparation stage, the atmosphere protection stage, the heat treatment stage, and the rapid cooling stage. The vacuum preparation stage is to evacuate the furnace to a vacuum state to completely remove interfering gases such as oxygen and water vapor in the furnace; the atmosphere protection stage is to fill the furnace with inert gases such as argon or nitrogen to establish an oxygen-free protective environment; the heat treatment stage is to heat treat the workpiece under the protection of the inert gas; the rapid cooling stage is to fill the furnace with high-purity nitrogen through a heat exchanger for rapid cooling to fix the final microstructure and performance state of the workpiece.

[0004] The rapid cooling stage of a vacuum heat treatment furnace is a critical step in the heat treatment process, directly affecting the workpiece's microstructure, dimensional accuracy, and surface quality. A common cooling method is gas cooling, which involves introducing an inert gas into the vacuum furnace to remove heat through forced convection. However, this method results in slow cooling and low efficiency. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a vacuum heat treatment equipment that adopts a combination of external air cooling and circulating heat exchange to cool the outside and inside of the furnace body at the same time, effectively shortening the cooling time of the furnace body and solving the technical problem of low cooling efficiency of existing vacuum heat treatment furnaces.

[0006] To achieve the above object, the present invention provides a vacuum heat treatment device, comprising:

[0007] furnace body;

[0008] The heat preservation box and the heat preservation box cover are arranged on the outer periphery of the furnace body. An external cooling air duct is formed between the heat preservation box and the furnace body, and the external cooling air duct is connected to the outside world; the outside normal temperature air flows through the outer surface of the furnace body along the external cooling air duct;

[0009] A heat exchanger, the inner cavity of the heat exchanger is connected to the inner cavity of the furnace body through a heat exchange pipeline, and the high-temperature gas flow in the furnace body flows into the heat exchanger along the heat exchange pipeline and becomes a low-temperature gas flow after heat exchange.

[0010] In some embodiments, the insulation box is fixedly provided with an external air inlet pipe and an external air outlet pipe, and the external air inlet pipe and the external air outlet pipe are respectively connected to both ends of the external cold air duct; the external air inlet pipe is provided with an external cold air fan, and the external cold air fan drives the normal-temperature air flow to flow through the external air inlet pipe, the external cold air duct and the external air outlet pipe in sequence.

[0011] In some embodiments, a spiral guide plate is fixedly provided on the outer surface of the furnace body, and the spiral guide plate is used to guide the normal-temperature air flow in the external cold air duct to flow along a spiral line around the outer surface of the furnace body.

[0012] In some embodiments, along the axial direction of the furnace body, the external air inlet pipe and the external air outlet pipe are respectively fixedly provided at both ends of the insulation box;

[0013] The cross section of the insulation box is rectangular; along the circumferential direction of the furnace body, the external air inlet pipe and the external air outlet pipe are diagonally distributed.

[0014] In some embodiments, the insulation box includes an upper side plate, a left side plate, a lower side plate and a right side plate that are vertically connected in sequence; the external air inlet pipe is fixedly provided on the side of the left side plate away from the upper side plate; the external air outlet pipe is fixedly provided on the side of the upper side plate away from the left side plate.

[0015] In some embodiments, the insulation box further includes a front end plate and a rear end plate that are oppositely arranged; a furnace door is provided at the front end of the furnace body, and a flange is provided at the rear end of the furnace body;

[0016] Along the axial direction of the furnace body, the front end of the furnace body passes through the front end plate until the furnace door of the furnace body is located outside the insulation box; the rear end of the furnace body is opposite to the rear end plate, and the flange passes through the rear end plate.

[0017] In some embodiments, external heaters are provided on the upper side plate, the left side plate, the lower side plate and the right side plate; further included are:

[0018] An external temperature detection component, which is used to detect the current external temperature of the outer surface of the furnace body; the external temperature detection component, the external heater and the external cold air fan are respectively connected to a controller;

[0019] When the current external temperature is within the set heating temperature range, the controller adjusts the power of the external heater according to the signal fed back by the external temperature detection component and turns off the external cold air fan;

[0020] When the current external temperature is within the set cooling temperature range, the controller turns off the external heater according to the signal fed back by the external temperature detection component and turns on the external cold air fan.

[0021] In some embodiments, the heat exchange pipeline includes an air inlet pipeline and an air return pipeline; the air inlet pipeline is connected between the air inlet of the heat exchanger and the inner cavity of the furnace body; the air return pipeline is connected between the air return port of the heat exchanger and the inner cavity of the furnace body; further included are:

[0022] A heat exchange fan, which is arranged in the air inlet pipeline; the high-temperature air flow in the furnace body is drawn into the air inlet pipeline by the heat exchange fan, flows into the heat exchanger along the air inlet pipeline, and the low-temperature air flow generated by heat exchange is blown into the inner cavity of the furnace body along the air return pipeline.

[0023] In some embodiments, an air inlet control valve is provided in the air inlet pipeline, and an air return control valve is provided in the air return pipeline; further included are:

[0024] An in-furnace temperature detection component, which is used to detect the current in-furnace temperature in the furnace body; the in-furnace temperature detection component, the air inlet control valve, the air return control valve and the heat exchange fan are all connected to the controller;

[0025] A cooling time detection component, which is used to detect whether the current temperature of the furnace body is maintained within the set cooling temperature range within the set time period;

[0026] When the current in-furnace temperature is within the set heating temperature range, the controller closes the air inlet control valve, the air return control valve and the heat exchange fan according to the signal fed back by the in-furnace temperature detection component;

[0027] When the current in-furnace temperature is within the set cooling temperature range and the current in-furnace temperature is maintained within the set cooling temperature range within the set time period, the controller opens the air inlet control valve, the air return control valve and the heat exchange fan according to the signals fed back by the in-furnace temperature detection component and the cooling time detection component.

[0028] In some embodiments, further included are:

[0029] A furnace door detection component, which is used to detect whether the furnace door is in an open state;

[0030] A furnace door driving component, which is connected to the furnace door and is used to drive the furnace door to flip;

[0031] A furnace door auxiliary frame, which is fixedly arranged, and the furnace door driving component is fixedly arranged on the top of the furnace door auxiliary frame;

[0032] An alarm, which is used to give an alarm;

[0033] The furnace door detection component, the furnace door driving component and the alarm are all connected to the controller;

[0034] When the furnace door detection component detects that the furnace door is in an open state, the controller starts the furnace door driving component and the alarm according to the signal fed back by the furnace door detection component, and closes the air inlet control valve, the air return control valve, the heat exchange fan and the external cooling fan.

[0035] Compared with the background art, the structure of the vacuum heat treatment equipment of the present invention is optimized. A heat preservation box is arranged outside the furnace body, and an external cold air duct is formed between the heat preservation box and the furnace body; and the inner cavity of the furnace body is connected to a heat exchanger through a heat exchange pipeline; thus, two heat exchange channels are formed. One is that the normal temperature air flow in the outside world flows along the external cold air duct. When the normal temperature air flow flows through the outer surface of the furnace body, the normal temperature air flow and the outer surface of the furnace body perform forced convection heat dissipation, and the heat of the outer surface of the furnace body is taken away in the way of external air cooling, so as to cool the outside of the furnace body; the other is that the high-temperature air flow in the furnace body flows into the heat exchanger along the heat exchange pipeline, becomes a low-temperature air flow after heat exchange, and then the low-temperature air flow flows back into the furnace body along the heat exchange pipeline, and the inside of the furnace body is cooled in the way of circulating heat exchange.

[0036] In summary, the present invention adopts a combination of external air cooling and circulating heat exchange to cool the outside and inside of the furnace body at the same time, effectively shortening the cooling time of the furnace body, with a relatively high cooling speed of the furnace body, and realizing the improvement of cooling efficiency. Description of the Drawings

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative efforts.

[0038] Figure 1 It is a horizontal cross-sectional view of the vacuum heat treatment equipment provided by a specific embodiment of the present invention;

[0039] Figure 2 It is a longitudinal cross-sectional view of the vacuum heat treatment equipment provided by a specific embodiment of the present invention.

[0040] The reference numerals are as follows:

[0041] Furnace body 1, heat preservation box 2, external cold air duct 3, heat exchanger 4, heat exchange pipeline 5, external air inlet pipe 6, external air outlet pipe 7, external cold air fan 8 and heat exchange fan 9;

[0042] Furnace door 11, flange 12, furnace door driving member 13 and furnace door auxiliary frame 14;

[0043] Upper side plate 21, left side plate 22, lower side plate 23, right side plate 24, front end plate 25 and rear end plate 26;

[0044] Air inlet pipeline 51 and air return pipeline 52;

[0045] Air inlet control valve 511;

[0046] Return air control valve 521. Detailed implementation manners

[0047] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0048] In order to enable those skilled in the art to better understand the solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] First of all, it should be noted that the four directions of "up", "down", "left", and "right" in the text respectively correspond to the upper side, lower side, left side, and right side of the heat preservation box 2 in the accompanying drawings. The two directions of "front" and "back" respectively correspond to the front end and the rear end of the heat preservation box 2 in the accompanying drawings. Figure 1 Figure 2 The embodiments of the present invention disclose a vacuum heat treatment device. As shown in the accompanying drawings, it includes a furnace body 1, a heat preservation box 2, and a heat exchanger 4. The furnace body 1 is specifically the furnace body 1 of a vacuum heat treatment furnace. The inner cavity of the furnace body 1 is a vacuum chamber for heat-treating workpieces in a vacuum environment. The furnace body 1 is cylindrical, with a furnace door 11 at one end and a flange 12 at the other end. The flange 12 is used to externally connect various detection components, etc.

[0050] Figure 1 The heat preservation box 2 covers the outer periphery of the furnace body 1, preventing the furnace wall from conducting heat to the outside, reducing heat dissipation, ensuring the stability of the heating temperature inside the furnace body 1, and avoiding affecting the material properties of the workpiece due to uneven temperature inside the furnace body 1. An external cold air duct 3 is formed between the heat preservation box 2 and the furnace body 1. The external cold air duct 3 is connected to the outside. The normal-temperature air flow from the outside flows along the external cold air duct 3 through the outer surface of the furnace body 1. Specifically, the normal-temperature air flow from the outside flows into the heat preservation box 2 from one end of the external cold air duct 3, flows along the external cold air duct 3 in the heat preservation box 2, and the normal-temperature air flow flows around the outer surface of the furnace body 1. When the temperature of the outer surface of the furnace body 1 is higher than the temperature of the normal-temperature air flow, the normal-temperature air flow exchanges heat with the outer surface of the furnace body 1. After the exchange, the normal-temperature air flow becomes a high-temperature air flow and is discharged from the other end of the external cold air duct 3 to the outside of the heat preservation box 2. The temperature of the outer surface of the furnace body 1 decreases, avoiding the excessive temperature of the outer surface of the furnace body 1 from affecting the temperature uniformity inside the furnace, and being beneficial to improving the heat treatment quality of the furnace body 1. 2 And

[0051]

[0052] ​​​The heat exchanger 4 is connected to the inner cavity of the furnace body 1 through a heat exchange pipeline 5. The high-temperature gas flow in the furnace body 1 flows into the heat exchanger 4 along the heat exchange pipeline 5 and becomes a low-temperature gas flow after heat exchange. Specifically, the heat exchanger 4 is located outside the heat preservation box 2. Both ends of the heat exchange pipeline 5 pass through the heat preservation box 2 and extend into the interior of the furnace body 1 until they are connected to the inner cavity of the furnace body 1, forming a circulating heat exchange between the interior of the furnace body 1 and the heat exchanger 4. When the high-temperature gas flow in the furnace body 1 flows into the heat exchange pipeline 5 from one end of the heat exchange pipeline 5, the high-temperature gas flow flows along the heat exchange pipeline 5 until it flows into the heat exchanger 4. The high-temperature gas flow exchanges heat with the cooling medium in the heat exchanger 4. After heat exchange, the high-temperature gas flow becomes a low-temperature gas flow. The low-temperature gas flow continues to flow along the heat exchange pipeline 5 until it flows into the furnace body 1 from the other end of the heat exchange pipeline 5. The low-temperature gas flow continues to exchange heat with the high-temperature gas flow in the furnace body 1, reducing the internal temperature of the furnace body 1 and avoiding affecting the material properties of the workpiece due to the internal temperature of the furnace body 1 exceeding the tolerance limit of the workpiece material, effectively improving the heat treatment quality. In addition, it can also avoid high-temperature damage to the components inside the furnace body 1, such as the furnace chamber support or the sealing ring, etc., which is beneficial to extending the service life of the furnace body 1.

[0053] The present invention optimizes the structure of the vacuum heat treatment equipment to form two heat exchange channels. One is that the normal-temperature gas flow from the outside flows along the external cold air duct 3. When the normal-temperature gas flow flows through the outer surface of the furnace body 1, the normal-temperature gas flow conducts forced convection heat dissipation with the outer surface of the furnace body 1, taking away the heat of the outer surface of the furnace body 1 in the way of external air cooling to cool down the outside of the furnace body 1. The other is that the high-temperature gas flow in the furnace body 1 flows into the heat exchanger 4 along the heat exchange pipeline 5, becomes a low-temperature gas flow after heat exchange, and then the low-temperature gas flow flows into the furnace body 1 along the heat exchange pipeline 5 to cool down the interior of the furnace body 1 in the way of circulating heat exchange.

[0054] In summary, the present invention adopts the combination of external air cooling and circulating heat exchange to cool the outside and inside of the furnace body 1 at the same time, effectively shortening the cooling time of the furnace body 1, with a relatively high cooling speed of the furnace body 1, realizing the improvement of the cooling efficiency.

[0055] As a preferred embodiment, an external air inlet duct 6 and an external air outlet duct 7 are fixedly provided inside the heat preservation box 2, and specifically, they can be fixed on the heat preservation box 2 by welding. The external air inlet duct 6 and the external air outlet duct 7 are respectively connected to both ends of the external cold air duct 3. The external air inlet duct 6 is used to guide the normal temperature air flow into the external cold air duct 3, and the external air outlet duct 7 is used to guide the high-temperature air flow after heat exchange out of the external cold air duct 3. The cross-sectional area of the external air inlet duct 6 is smaller than that of the external air outlet duct 7, ensuring that the air inlet speed of the external air inlet duct 6 is greater than the air outlet speed of the external air outlet duct 7, prolonging the residence time of the normal temperature air flow in the external cold air duct 3, enabling the normal temperature air flow to fully exchange heat with the outer surface of the furnace body 1, taking away more heat, and improving the heat exchange efficiency. A filter can be provided at the air inlet of the external air inlet duct 6 to filter out impurities carried in the normal temperature air flow, preventing a large amount of impurities from adhering to the inner wall of the heat preservation box 2 and affecting the heat preservation effect.

[0056] An external cold air fan 8 is provided on the external air inlet duct 6. The external cold air fan 8 can specifically be a centrifugal fan, which is suitable for the high-resistance working conditions inside the heat preservation box 2. The external cold air fan 8 is located outside the heat preservation box 2 for convenient maintenance. The external cold air fan 8 drives the normal temperature air flow to flow through the external air inlet duct 6, the external cold air duct 3, and the external air outlet duct 7 in sequence. Specifically, when the external cold air fan 8 is started, the external cold air fan 8 sucks the normal temperature air flow into the external air inlet duct 6. The normal temperature air flow flows along the external air inlet duct 6 into the external cold air fan 8, is pressurized by the external cold air fan 8 and then flows into the external cold air duct 3, exchanges heat with the outer surface of the furnace body 1 in the external cold air duct 3 and then flows into the external air outlet duct 7, and finally is discharged out of the heat preservation box 2 along the external air outlet duct 7. In the present invention, by providing the external cold air fan 8 in the external cold air duct 3, the pressure of the normal temperature air flow is increased, ensuring that the normal temperature air flow can smoothly bypass the outer surface of the furnace body 1.

[0057] As a preferred embodiment, a spiral guide plate is fixedly provided on the outer surface of the furnace body 1. The spiral guide plate is used to guide the normal temperature air flow in the external cold air duct 3 to flow along a spiral line around the outer surface of the furnace body 1, prolonging the flow path of the normal temperature air flow, increasing the contact area between the normal temperature air flow and the outer surface of the furnace body 1, ensuring that the normal temperature air flow completely covers the outer surface of the furnace body 1, and improving the heat exchange efficiency.

[0058] As a preferred embodiment, along the axial direction of the furnace body 1, the external air inlet duct 6 and the external air outlet duct 7 are respectively fixedly provided at both ends of the heat preservation box 2. By increasing the axial distance between the external air inlet duct 6 and the external air outlet duct 7, the length of the external cold air duct 3 is prolonged, thereby prolonging the flow path of the normal temperature air flow, and further improving the heat exchange efficiency.

[0059] Furthermore, the cross-section of the heat preservation box 2 is rectangular; along the circumferential direction of the furnace body 1, the external air inlet duct 6 and the external air outlet duct 7 are diagonally distributed, increasing the circumferential distance between the external air inlet duct 6 and the external air outlet duct 7, and can also improve the heat exchange efficiency by prolonging the air flow path.

[0060] Specifically, the heat preservation box 2 includes an upper side plate 21, a left side plate 22, a lower side plate 23, and a right side plate 24 that are vertically connected in sequence. The four form a rectangular structure, and their lengths are equal, but are all less than the axial length of the furnace body 1. The external air inlet pipe 6 is fixedly arranged on the side of the left side plate 22 away from the upper side plate 21; the external air outlet pipe 7 is fixedly arranged on the side of the upper side plate 21 away from the left side plate 22 to ensure that the circumferential distance between the external air inlet pipe 6 and the external air outlet pipe 7 reaches the maximum.

[0061] As a preferred embodiment, the heat preservation box 2 further includes a front end plate 25 and a rear end plate 26 that are oppositely arranged; a furnace door 11 is provided at the front end of the furnace body 1, and a flange 12 is provided at the rear end of the furnace body 1. Along the axial direction of the furnace body 1, the front end of the furnace body 1 passes through the front end plate 25 until the furnace door 11 of the furnace body 1 is located outside the heat preservation box 2 to prevent the heat preservation box 2 from affecting the normal opening and closing of the furnace door 11. The rear end of the furnace body 1 is opposite to the rear end plate 26, and the flange 12 passes through the rear end plate 26 to facilitate the disassembly of each detection part.

[0062] External heaters are provided on the upper side plate 21, the left side plate 22, the lower side plate 23, and the right side plate 24 to compensate for the heat lost from the outer surface of the furnace body 1, maintain a constant temperature on the outer surface of the furnace body 1, control a stable temperature difference between the outside and the inside of the furnace body 1, and prevent the temperature difference between the outside and the inside of the furnace body 1 from being too large and affecting the heat treatment quality of the workpiece.

[0063] As a preferred embodiment, the vacuum heat treatment equipment further includes an external temperature detection part for detecting the current external temperature of the outer surface of the furnace body 1, which can specifically be a temperature sensor. The external temperature detection part, the external heater, and the external cooling fan 8 are respectively connected to the controller.

[0064] When the external temperature detection part detects that the current external temperature of the outer surface of the furnace body 1 is within the set heating temperature range, it is in the heating stage at this time. The external temperature detection part feeds back a signal to the controller. After the controller makes a judgment and processing, it sends a signal to the external heater and the external cooling fan 8, adjusts the power of the external heater, and turns off the external cooling fan 8 to automatically heat the outer surface temperature of the furnace body 1, preventing the outer surface temperature of the furnace body 1 from being too low, and further preventing the temperature difference between the inside and the outside of the furnace body 1 from being too large and affecting the heat treatment accuracy of the workpiece.

[0065] When the external temperature detection part detects that the current external temperature of the outer surface of the furnace body 1 is within the set cooling temperature range, it is in the cooling stage at this time. The external temperature detection part feeds back a signal to the controller. After the controller makes a judgment and processing, it sends a signal to the external heater and the external cooling fan 8, turns off the external heater, and turns on the external cooling fan 8 to automatically reduce the outer surface temperature of the furnace body 1 by means of forced convection, preventing the outer surface temperature of the furnace body 1 from being too high, avoiding damage to the outer surface of the furnace body 1 due to high temperature, and preventing the temperature difference between the inside and the outside of the furnace body 1 from being too large.

[0066] That is to say, when the outer surface temperature of the furnace body 1 is relatively low, the power of the external heater is automatically adjusted to heat the outer surface of the furnace body 1; when the outer surface temperature of the furnace body 1 is relatively high, the external cooling fan 8 is automatically turned on to cool the outer surface of the furnace body 1. By monitoring the outer surface temperature of the furnace body 1, the present invention realizes the automatic opening and closing of the external heater and the external cooling fan 8, thereby automatically adjusting the outer surface temperature of the furnace body 1 to ensure that a constant temperature difference is maintained between the inside and the outside of the furnace body 1 and improving the heat treatment accuracy of the workpiece.

[0067] As a preferred embodiment, the heat exchange pipeline 5 is divided into two sections, including an air inlet pipeline 51 and an air return pipeline 52; the air inlet pipeline 51 is connected between the air inlet of the heat exchanger 4 and the inner cavity of the furnace body 1, and the high-temperature air flow in the furnace body 1 flows along the air inlet pipeline 51 to the heat exchanger 4. The air return pipeline 52 is connected between the air return port of the heat exchanger 4 and the inner cavity of the furnace body 1, and the low-temperature air flow after heat exchange flows back into the furnace body 1 through the air return pipeline 52.

[0068] As a preferred embodiment, the vacuum heat treatment equipment further includes a heat exchange fan 9. The heat exchange fan 9 is arranged in the air inlet pipeline 51, and the heat exchange fan 9 can also be a centrifugal fan. The heat exchange fan 9 is also arranged outside the heat preservation box 2 for convenient maintenance. The high-temperature air flow in the furnace body 1 is drawn into the air inlet pipeline 51 by the heat exchange fan 9, flows into the heat exchanger 4 along the air inlet pipeline 51, and the low-temperature air flow generated by heat exchange is blown into the inner cavity of the furnace body 1 along the air return pipeline 52. Specifically, when the heat exchange fan 9 is started, the heat exchange fan 9 draws the high-temperature air flow in the furnace body 1 into the air inlet pipeline 51. The high-temperature air flow flows into the heat exchange fan 9 along the air inlet pipeline 51, is pressurized by the heat exchange fan 9, then flows into the heat exchanger 4 along the air inlet pipeline 51, is heat-exchanged with the heat exchanger 4 into a low-temperature air flow, then flows into the air return pipeline 52, and finally flows back into the furnace body 1 along the air return pipeline 52. By arranging the heat exchange fan 9 in the heat exchange pipeline 5, the present invention increases the pressure of the high-temperature air flow, enabling the high-temperature air flow and the low-temperature air flow to circulate alternately in the heat exchanger 4 and the furnace body 1.

[0069] The air inlet pipeline 51 is provided with an air inlet control valve 511 for controlling the on-off of the air inlet pipeline 51. The air return pipeline 52 is provided with an air return control valve 521 for controlling the on-off of the air return pipeline 52. Both the air inlet pipeline 51 and the air return pipeline 52 can be solenoid valves.

[0070] As a preferred embodiment, the vacuum heat treatment equipment further includes an in-furnace temperature detection component and a cooling time detection component. The in-furnace temperature detection component is used to detect the current in-furnace temperature in the furnace body 1, and specifically can be a temperature sensor. The cooling time detection component is used to detect whether the current temperature of the furnace body 1 is maintained within a set cooling temperature range within a set time period, and the cooling time detection component can specifically be a timer. The in-furnace temperature detection component, the air inlet control valve 511, the air return control valve 521, the heat exchange fan 9, and the cooling time detection component are all connected to the controller.

[0071] When the in-furnace temperature detector detects that the current in-furnace temperature in the furnace body 1 is within the set heating temperature range, it is in the heating stage at this time. The in-furnace temperature detector feeds back a signal to the controller. After the controller judges and processes, it sends a signal to the air inlet control valve 511, the air return control valve 521 and the heat exchange fan 9, closes the air inlet control valve 511, the air return control valve 521 and the heat exchange fan 9, and the heat exchanger 4 automatically stops heat exchange with the inside of the furnace body 1 to prevent the temperature in the furnace body 1 from being too low and affecting the heat treatment quality of the workpiece.

[0072] When the in-furnace temperature detector detects that the current in-furnace temperature in the furnace body 1 is within the set cooling temperature range and the current in-furnace temperature remains within the set cooling temperature range within the set time period, it is in the cooling stage at this time. The in-furnace temperature detector and the cooling time detector simultaneously feed back signals to the controller. After the controller judges and processes, it sends a signal to the air inlet control valve 511, the air return control valve 521 and the heat exchange fan 9, opens the air inlet control valve 511, the air return control valve 521 and the heat exchange fan 9, and the heat exchanger 4 automatically starts heat exchange with the inside of the furnace body 1 to prevent the temperature in the furnace body 1 from being too high.

[0073] The present invention monitors the temperature in the furnace body 1, controls the automatic opening or closing of the air inlet control valve 511, the air return control valve 521 and the heat exchange fan 9, realizes the automatic adjustment of the temperature in the furnace body 1, keeps the temperature in the furnace body 1 stable, prevents workpiece damage caused by unstable temperature in the furnace body 1, and is beneficial to improving the heat treatment precision.

[0074] As a preferred embodiment, the vacuum heat treatment equipment further includes a furnace door detector, a furnace door driving member 13, a furnace door auxiliary frame 14 and an alarm. The furnace door detector is used to detect whether the furnace door 11 is in an open state, specifically, it can be a contact sensor or an infrared probe, etc. The furnace door driving member 13 is connected to the furnace door 11. The furnace door 11 and the furnace body 1 are rotationally connected through a rotating shaft. The furnace door driving member 13 is used to drive the furnace door 11 to flip around the rotating shaft to make the furnace door 11 in an open state or a closed state. The furnace door driving member 13 can specifically be a driving cylinder. The furnace door auxiliary frame 14 is fixedly arranged, and the furnace door driving member 13 is fixedly provided at the top of the furnace door auxiliary frame 14 to stably support the furnace door driving member 13 by using the furnace door auxiliary frame 14. The alarm is used to give an alarm. The furnace door detector, the furnace door driving member 13 and the alarm are all connected to the controller;

[0075] When the furnace door detection component detects that the furnace door 11 is in the open state, the furnace door detection component feeds back a signal to the controller. After judgment and processing by the controller, signals are sent to the furnace door driving component 13, the alarm, the air inlet control valve 511, the air return control valve 521, the heat exchange fan 9, and the external cooling fan 8. The furnace door driving component 13 and the alarm are automatically started, and the air inlet control valve 511, the air return control valve 521, the heat exchange fan 9, and the external cooling fan 8 are automatically closed. That is, when taking and placing workpieces or in case of an accident, once the furnace door 11 is opened, both the external cold air duct 3 and the heat exchanger 4 automatically stop heat exchange, avoiding energy waste, facilitating energy conservation, and improving the heat treatment efficiency.

[0076] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0077] Specific examples are used in this article to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A vacuum heat treatment device, characterized in that, Comprising: A furnace body (1); A heat preservation box (2), the heat preservation box (2) is sleeved on the outer periphery of the furnace body (1), an outer cold air duct (3) is formed between the heat preservation box (2) and the furnace body (1), and the outer cold air duct (3) is communicated with the outside; the normal temperature air flow of the outside flows along the outer cold air duct (3) through the outer surface of the furnace body (1); A heat exchanger (4), the heat exchanger (4) is communicated with the inner cavity of the furnace body (1) through a heat exchange pipeline (5), the high-temperature air flow in the furnace body (1) flows into the heat exchanger (4) along the heat exchange pipeline (5), and becomes a low-temperature air flow after heat exchange.

2. The vacuum heat treatment equipment according to claim 1, characterized in that, The heat preservation box (2) is fixedly provided with an outer air inlet pipe (6) and an outer air outlet pipe (7), the outer air inlet pipe (6) and the outer air outlet pipe (7) are respectively communicated with two ends of the outer cold air duct (3); the outer air inlet pipe (6) is provided with an outer cold air fan (8), and the outer cold air fan (8) drives the normal temperature air flow to flow through the outer air inlet pipe (6), the outer cold air duct (3) and the outer air outlet pipe (7) in sequence.

3. The vacuum heat treatment equipment according to claim 2, characterized in that, A spiral guide plate is fixedly arranged on the outer surface of the furnace body (1), and the spiral guide plate is used for guiding the normal temperature air flow in the outer cold air duct (3) to flow along a spiral line around the outer surface of the furnace body (1).

4. The vacuum heat treatment equipment according to claim 2, characterized in that, Along the axial direction of the furnace body (1), the outer air inlet pipe (6) and the outer air outlet pipe (7) are respectively fixedly arranged at two ends of the heat preservation box (2); The cross section of the heat preservation box (2) is rectangular; along the circumferential direction of the furnace body (1), the outer air inlet pipe (6) and the outer air outlet pipe (7) are diagonally distributed.

5. The vacuum heat treatment equipment according to claim 4, characterized in that The heat preservation box (2) comprises an upper side plate (21), a left side plate (22), a lower side plate (23) and a right side plate (24) which are vertically connected in sequence; the outer air inlet pipe (6) is fixedly arranged on the side of the left side plate (22) away from the upper side plate (21); the outer air outlet pipe (7) is fixedly arranged on the side of the upper side plate (21) away from the left side plate (22).

6. The vacuum heat treatment equipment according to claim 5, wherein, The heat preservation box (2) further comprises a front end plate (25) and a rear end plate (26) which are oppositely arranged; a furnace door (11) is arranged at the front end of the furnace body (1), and a flange plate (12) is arranged at the rear end of the furnace body (1); Along the axial direction of the furnace body (1), the front end of the furnace body (1) passes through the front end plate (25) until the furnace door (11) of the furnace body (1) is located outside the heat preservation box (2); the rear end of the furnace body (1) is opposite to the rear end plate (26), and the flange plate (12) passes through the rear end plate (26).

7. The vacuum heat treatment equipment according to claim 6, characterized in that, External heaters are arranged on the upper side plate (21), the left side plate (22), the lower side plate (23) and the right side plate (24); Further comprising: An external furnace temperature detector for detecting the current external furnace temperature of the outer surface of the furnace body (1); the external furnace temperature detector, the external heater, and the external cooling fan (8) are respectively connected to a controller; when the current external furnace temperature is within the set heating temperature range, the controller adjusts the power of the external heater according to the signal fed back by the external furnace temperature detector and turns off the external cooling fan (8); When the current external furnace temperature is within the set cooling temperature range, the controller turns off the external heater and turns on the external cooling fan (8) according to the signal fed back by the external furnace temperature detector.

8. The vacuum heat treatment equipment according to claim 7, characterized in that, The heat exchange pipeline (5) includes an air inlet pipeline (51) and an air return pipeline (52); the air inlet pipeline (51) is connected between the air inlet of the heat exchanger (4) and the inner cavity of the furnace body (1); the air return pipeline (52) is connected between the air return port of the heat exchanger (4) and the inner cavity of the furnace body (1); further included are: A heat exchange fan (9) provided in the air inlet pipeline (51); the high-temperature air flow in the furnace body (1) is drawn into the air inlet pipeline (51) by the heat exchange fan (9), flows into the heat exchanger (4) along the air inlet pipeline (51), and the low-temperature air flow generated by heat exchange is blown into the inner cavity of the furnace body (1) along the air return pipeline (52).

9. The vacuum heat treatment equipment according to claim 8, characterized in that, The air inlet pipeline (51) is provided with an air inlet control valve (511), and the air return pipeline (52) is provided with an air return control valve (521); further included are: An internal furnace temperature detector for detecting the current internal furnace temperature in the furnace body (1); the internal furnace temperature detector, the air inlet control valve (511), the air return control valve (521), and the heat exchange fan (9) are all connected to the controller; A cooling time detector for detecting whether the current temperature of the furnace body (1) is maintained within the set cooling temperature range within a set time period; When the current internal furnace temperature is within the set heating temperature range, the controller closes the air inlet control valve (511), the air return control valve (521), and the heat exchange fan (9) according to the signal fed back by the internal furnace temperature detector; When the current internal furnace temperature is within the set cooling temperature range and the current internal furnace temperature is maintained within the set cooling temperature range within the set time period, the controller opens the air inlet control valve (511), the air return control valve (521), and the heat exchange fan (9) according to the signals fed back by the internal furnace temperature detector and the cooling time detector.

10. The vacuum heat treatment equipment according to claim 9, characterized in that, Further included are: A furnace door detector for detecting whether the furnace door (11) is in an open state; A furnace door driving member (13) connected to the furnace door (11) for driving the furnace door (11) to flip. The furnace door auxiliary frame (14), the furnace door auxiliary frame (14) is fixedly arranged, and the furnace door driving member (13) is fixedly arranged at the top of the furnace door auxiliary frame (14); An alarm, the alarm is used for giving an alarm; The furnace door detection member, the furnace door driving member (13) and the alarm are all connected to the controller; When the furnace door detection member detects that the furnace door (11) is in the open state, the controller starts the furnace door driving member (13) and the alarm according to the signal fed back by the furnace door detection member, and closes the air inlet control valve (511), the air return control valve (521), the heat exchange fan (9) and the external cooling fan (8).

Images