CN211595729U - Supercritical nitrogen quenching circulating cooling system for vacuum furnace - Google Patents
Supercritical nitrogen quenching circulating cooling system for vacuum furnace Download PDFInfo
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- CN211595729U CN211595729U CN202020148148.0U CN202020148148U CN211595729U CN 211595729 U CN211595729 U CN 211595729U CN 202020148148 U CN202020148148 U CN 202020148148U CN 211595729 U CN211595729 U CN 211595729U
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 238000001816 cooling Methods 0.000 title claims abstract description 89
- 238000010791 quenching Methods 0.000 title claims abstract description 81
- 230000000171 quenching effect Effects 0.000 title claims abstract description 72
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 50
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 238000012546 transfer Methods 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 239000010959 steel Substances 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 40
- 230000001105 regulatory effect Effects 0.000 claims description 19
- 239000007921 spray Substances 0.000 claims description 17
- 238000012544 monitoring process Methods 0.000 claims description 11
- 230000001276 controlling effect Effects 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 5
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 4
- 229910001315 Tool steel Inorganic materials 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000000712 assembly Effects 0.000 claims description 2
- 238000000429 assembly Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 12
- 239000002826 coolant Substances 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 229910001873 dinitrogen Inorganic materials 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/613—Gases; Liquefied or solidified normally gaseous material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
The utility model provides a supercritical nitrogen quenching circulating cooling system for a vacuum furnace, which comprises a heating chamber, a transfer chamber and a quenching chamber which are arranged in sequence, wherein the quenching chamber is a pressure-resistant sealed cavity, and is internally provided with a fan, a heat exchanger and nozzle components arranged around a workpiece; the nozzle assembly is communicated with a supercritical tank arranged outside the quenching chamber through a pipeline, and the quenching chamber is communicated with the supercritical tank through a condensing chamber, a liquid nitrogen tank and a pressure/temperature regulator through a pipeline. The utility model discloses a supercritical nitrogen quenching circulative cooling system adopts supercritical nitrogen gas as the coolant, and cooling speed is fast, the cooling is even, cooling rate is controllable, can be used to steel material and non ferrous metal vacuum heat treatment quenching, has solved the not enough and inhomogeneous problem of cooling of traditional vacuum heat treatment quenching process work piece cooling rate.
Description
Technical Field
The utility model relates to the technical field of heat treatment, in particular to a supercritical nitrogen quenching circulating cooling system for a vacuum furnace.
Background
The vacuum heat treatment is mainly used for products with strict requirements on the deformation rate of workpieces in the material heat treatment process, and is widely applied to the treatment of tool and die steel and aluminum alloy T7. However, the currently widely used vacuum furnace relies on nitrogen gas internal circulation cooling, and has the problems of insufficient cooling rate, uneven cooling, uncontrollable cooling rate, low production efficiency and the like. Therefore, how to provide a cooling technology of a vacuum heat treatment furnace with high cooling efficiency and controllable cooling rate is a technical problem which is solved by the technical proposal of the technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: aiming at the defects of the prior art, the supercritical nitrogen quenching circulating cooling system for the vacuum furnace is high in cooling efficiency and controllable in cooling rate.
The utility model discloses a solve above-mentioned technical problem and adopt following technical scheme:
the utility model provides a supercritical nitrogen quenching circulating cooling system for a vacuum furnace, which comprises a heating chamber, a transfer chamber and a quenching chamber which are arranged in sequence, wherein the quenching chamber is a pressure-resistant sealed cavity, and is internally provided with a fan, a heat exchanger and nozzle assemblies arranged around a workpiece; the nozzle assembly is communicated with a supercritical tank arranged outside the quenching chamber through a pipeline, and the quenching chamber is communicated with the supercritical tank through a condensing chamber, a liquid nitrogen tank and a pressure/temperature regulator through a pipeline.
Further, in the supercritical nitrogen quenching circulating cooling system, the system also comprises a high-pressure gas tank which is respectively connected with the condensing chamber, the liquid nitrogen tank, the pressure regulating/temperature regulating device and the supercritical tank.
Further, in the supercritical nitrogen quenching circulating cooling system, the nozzle assembly consists of a plurality of spray heads with different sizes, and the spraying direction and the flow rate of the spray heads are adjustable.
Further, in the supercritical nitrogen quenching circulation cooling system, the heat exchanger is arranged between the fan and the workpiece to be quenched.
Further preferably, in the supercritical nitrogen quenching circulation cooling system, the heat exchanger is a water/gas heat exchanger.
Further, in the supercritical nitrogen quenching cycle cooling system, the method further comprises the following steps:
the temperature sensor is arranged in the quenching chamber and used for monitoring the gas temperature and the surface temperature of the workpiece;
the pressure sensor is arranged in the quenching chamber and used for monitoring gas pressure;
the flow velocity sensor is arranged on the nozzle assembly and used for monitoring the flow velocity of each sprayer gas; and
and the electromagnetic regulating valve is arranged on the nozzle assembly and is used for regulating the gas injection size of each spray head.
Further preferably, in the supercritical nitrogen quenching cycle cooling system, a PID controller for controlling the cooling rate of the workpiece is further included, and the PID controller is electrically connected to each of the temperature sensor, the pressure sensor, the flow rate sensor and the electromagnetic regulating valve.
Further, in the supercritical nitrogen quenching circulating cooling system, the pressure of the supercritical nitrogen in the supercritical tank is more than or equal to 3.4MPa, and the temperature is more than or equal to-146 ℃.
Further, in the supercritical nitrogen quenching circulating cooling system, quick-opening doors are arranged between the heating chamber and the transfer chamber and between the transfer chamber and the quenching chamber.
Further, in the supercritical nitrogen quenching circulating cooling system, the workpiece is tool steel, die steel or aluminum alloy.
The utility model adopts the above technical scheme, compare with prior art, have following technological effect:
(1) the heat transfer efficiency is high, and the cooling rate is fast: by adopting jet cooling, the thermal boundary layer on the surface of the workpiece can be effectively damaged, and the cooling rate is improved;
(2) cooling uniformly: the plurality of spray heads arranged around the workpiece are adopted for high-pressure spray cooling, so that any surface of the workpiece can be effectively ensured to obtain effective turbulent heat exchange;
(3) controllable cooling: theoretical analysis and simulation are carried out on the workpiece before heat treatment, the cooling characteristics of all parts of the workpiece are determined, and the thermal junction and the thermal stress of the workpiece are analyzed; the PID controller is used for accurately regulating and controlling the cooling rate of the workpiece, so that the ideal cooling of the workpiece can be realized;
(4) the supercritical nitrogen is adopted as the coolant, so that the environment is friendly, and the uniformity of the coolant medium provides guarantee for uniform cooling;
(5) the refrigeration system realizes controllable cooling by accurately controlling the cooling process, and solves the problems of insufficient cooling capacity and uneven cooling of the prior art; can be widely applied to the vacuum heat treatment of tool steel, die steel and aluminum alloy.
Drawings
FIG. 1 is a schematic structural diagram of a supercritical nitrogen quenching circulating cooling system for a vacuum furnace according to the present invention;
FIG. 2 is a structural diagram of the arrangement of the nozzle assembly in the supercritical nitrogen quenching circulating cooling system for the vacuum furnace of the present invention;
FIG. 3 is a structural diagram of the surface temperature control of a workpiece in a supercritical nitrogen quenching circulating cooling system for a vacuum furnace according to the present invention;
wherein the reference symbols are:
1-workpiece, 2-heating chamber, 3-transfer chamber, 4-quenching chamber, 5-condensation chamber, 6-liquid nitrogen tank, 7-pressure regulating/temperature regulating device, 8-supercritical tank, 9-high pressure gas tank, 10-fan, 11-heat exchanger, 12-nozzle assembly, 13-first spray head, 14-second spray head, 15-third spray head, 16-fourth spray head, 17-first electromagnetic regulating valve, 18-second electromagnetic regulating valve, 19-third electromagnetic regulating valve and 20-fourth electromagnetic regulating valve.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings.
The embodiment provides a supercritical nitrogen quenching circulating cooling system for a vacuum furnace, which adopts supercritical nitrogen as a coolant, the pressure range of the supercritical nitrogen is larger than or equal to 3.4MPa, the temperature is larger than or equal to-146 ℃, the cooling speed is high, the cooling is uniform, the cooling rate is controllable, the system can be used for vacuum heat treatment quenching of steel materials and nonferrous metals, and the problems of insufficient cooling rate and nonuniform cooling of workpieces in the traditional vacuum heat treatment quenching process are solved. The method can be used for the controllable cooling of the vacuum quenching process of die steel and tool steel, and can also be used for the controllable cooling of T7 treatment of aluminum alloy.
Specifically, referring to fig. 1, the supercritical nitrogen quenching circulating cooling system includes a heating chamber 2, a transfer chamber 3 and a quenching chamber 4 which are sequentially arranged, wherein the quenching chamber 4 is a pressure-resistant sealed cavity, and a fan 10, a heat exchanger 11 and a nozzle assembly 12 arranged around a workpiece 1 are arranged in the quenching chamber 4; the nozzle assembly 12 is communicated with a supercritical tank 8 arranged outside the quenching chamber 4 through a pipeline, and the quenching chamber 4 is communicated with the supercritical tank 8 through a condensing chamber 5, a liquid nitrogen tank 6 and a pressure/temperature regulator 7 through pipelines.
In this embodiment, please refer to fig. 1, the supercritical nitrogen quenching cycle cooling system further includes a high pressure gas tank 9 connected to the condensing chamber 5, the liquid nitrogen tank 6, the pressure regulating/temperature regulating device 7 and the supercritical tank 8, respectively. The high-pressure air tank 9 is filled with high-pressure air for providing cooling air with certain pressure and temperature for the cooling system to compensate the system pressure.
As a preferable scheme of this embodiment, please refer to fig. 2, the nozzle assembly 12 is composed of a plurality of nozzles with different sizes, and the spraying direction and the flow rate of the nozzles are adjustable. The nozzle assembly 12 is composed of four first nozzles 13, four second nozzles 14, four third nozzles 15 and four fourth nozzles 16 which are respectively arranged at four corners of the workpiece 2, and the first nozzles 13, the second nozzles 14, the third nozzles 15 and the fourth nozzles 16 are different in size and are specifically selected to be arranged according to actual needs. The large-size spray head is selected to realize rapid air inlet in the early quenching stage, and the temperature of the coolant can be adjusted by injecting liquid nitrogen in the quenching process; the small-size spray head is selected to directly spray coolant to the surface of a workpiece, the spraying process of the small-size spray head at the initial quenching stage is a main factor for cooling the workpiece, and the heat transfer coefficient of the surface of the workpiece can be adjusted in a micro-scale manner by injecting a small amount of supercritical nitrogen in the quenching process. The air flow sprayed on the surface of the workpiece 1 can damage an air film on the surface of the workpiece, the turbulence on the surface of the workpiece 1 is strengthened, a thermal boundary layer is reduced, and the thermal resistance of convection heat exchange is reduced.
In this embodiment, the clamping, moving and rotating of each nozzle can be realized by using the existing mechanical mechanism, and the specific arrangement of the nozzles needs to consider the shape, material and heat treatment process specification requirements of the workpiece. Because of the relatively small nozzle size, the supercritical nitrogen gas is reduced by throttling through the nozzle chamber, which facilitates heat exchange between the workpiece and the gas. Therefore, more selectivity is provided for the working pressure of the quenching chamber, namely if the workpiece 1 can be directly sprayed and cooled, the low pressure of the quenching chamber can be selected, and thus the large jet velocity and the throttling expansion temperature reduction of the supercritical gas are fully utilized to strengthen the convection heat transfer.
In this embodiment, please continue to refer to fig. 1, the heat exchanger 11 is disposed between the fan 10 and the workpiece 1 to be quenched, the heat exchanger 11 is a water/air heat exchanger, and the fan 10 is a speed-adjustable fan. In addition to convection caused by gas injection, the fan 10 is arranged to improve the uniformity of gas flow, a speed-regulating fan 10 is arranged in the quenching chamber, the action of the fan 10 causes the gas to circulate along a certain gas channel as a whole, and when the gas flows across the surface of the workpiece 1, the gas and the workpiece 1 generate heat convection and exchange to absorb heat of the workpiece, so that the temperature of the workpiece is reduced. At the same time, the temperature of the gas increases due to the absorption ambient temperature. Therefore, a heat exchanger 11 is provided in the gas circulation path, and when the gas flows through the heat exchanger 11, the heat is transferred to water, and the heat absorbed by the cooling medium from the workpiece 1 is taken away, so that the temperature of the gas is maintained at the set temperature, and the cooling mechanism is maintained in the required temperature and pressure range.
As a preferred technical solution of this embodiment, the supercritical nitrogen quenching circulation cooling system further includes: the temperature sensor is arranged in the quenching chamber 4 and used for monitoring the gas temperature and the surface temperature of the workpiece 1; a pressure sensor arranged in the quenching chamber 4 for monitoring gas pressure; a flow rate sensor disposed on the nozzle assembly 12 for monitoring the flow rate of each showerhead gas; and an electromagnetic adjusting valve, not shown, disposed on the nozzle assembly 12 for adjusting the gas injection amount of each showerhead.
In addition, the supercritical nitrogen quenching circulating cooling system also comprises a PID controller used for controlling the cooling rate of the workpiece 1, and the PID controller is respectively and electrically connected with each temperature sensor, each pressure sensor, each flow rate sensor and each electromagnetic regulating valve. The PID controller, the temperature sensors, the pressure sensor, the flow rate sensor and the electromagnetic regulating valve form a control system of the cooling system, and the control system comprises the temperature control of cooling gas, the pressure control of gas, the automatic control of process parameters such as jet flow and the like. The temperature sensor, the pressure sensor and the speed sensor are used for monitoring the temperature, the pressure and the flow speed of gas in real time and monitoring the temperature of a workpiece in real time, and the PID controller matched with the control device can realize the test and control of the pressure, the temperature and the flow of the gas entering the quenching chamber, so that the cooling process of the workpiece 1 reaches a preset cooling curve and a preset cooling rate.
The working basis of the PID controller is the temperature of the workpiece, the temperature of gas, the pressure, the flow and other signals transmitted by the corresponding sensors, the heat transfer characteristics of each part of the surface of the workpiece are obtained by improving the computer simulation pair criticality before the workpiece is subjected to heat treatment, and an ideal cooling curve of each part of the surface of the workpiece is provided. The control system calculates the interpolation of the real-time temperature and the temperature on the ideal cooling curve according to the temperature signal measured by the workpiece in real time, and adjusts the speed of the jet gas and the rotating speed of the speed-adjusting fan according to the positive and negative sum of the difference value to strengthen or reduce the cooling rate, so that the error area of the actual cooling rate and the ideal cooling rate of the workpiece is minimized.
In the present embodiment, quick-opening doors may be provided between the heating chamber 2 and the transfer chamber 3 and between the transfer chamber 3 and the quenching chamber 4, depending on the plant space conditions, such as the quick-opening doors being disposed at the side or bottom of the heating chamber 2, at the junctions between the transfer chamber 3 and the heating chamber 2 and the quenching chamber 4. The workpiece 1 can be rapidly transferred to the quenching chamber 4, the volume of the transfer chamber 3 is small, and the atmosphere and the air pressure can be rapidly adjusted to ensure that the pressure difference between the workpiece 1 which comes out of the heating chamber 2 and enters the quenching chamber 4 meets the process requirements.
Referring to fig. 3, a schematic diagram of a workpiece cooling speed temperature-time control system is shown, wherein the control system includes a PID controller and a controlled object. The PID controller is a linear controller that performs process control based on an error e (t) between a set value r (t) and an actual output value c (t), r (t) -c (t). In the embodiment, the surface temperature y (t) of the workpiece is taken as a control object, the surface temperature of the workpiece is measured in real time by an infrared thermometer, a measured value c (t) is fed back to a PID controller, the controller outputs an analog quantity signal u (t) to a regulator through PID regulation operation according to an error value e (t), and the regulator regulates parameters such as the speed of a fluid influencing a heat transfer coefficient according to the output analog quantity signal u (t).
Referring to fig. 1, the supercritical nitrogen quenching cycle cooling system for a vacuum furnace according to the present embodiment has the following working principle: the workpiece 1 is conveyed to the heating furnace from one side of the heating chamber 2, is heated, insulated, carburized and the like, and is firstly conveyed to the transfer chamber 3, so that the workpiece 1 and the transfer chamber 3 can be quickly transferred to the quenching chamber 4; in the initial quenching stage, the quenching chamber 4 is inflated through the supercritical tank 8 and the nozzle assembly 12, the flow rate and the direction of gas ejected by each nozzle can be flexibly adjusted according to the heat treatment requirement of the workpiece 1, and the gas can be directly ejected towards the surface of the workpiece 1 or ejected into an air passage; for the gas flow which can be directly sprayed on the surface of the workpiece 1 and sprayed on the surface of the workpiece 1, the gas film on the surface of the workpiece can be damaged, the thickness of the heat generated by convection heat transfer of the workpiece is reduced, the heat transfer rate can be greatly improved, so that the rapid cooling can be realized in the gas charging stage, and meanwhile, the cooling speed of the workpiece can be adjusted by controlling the flow rate and the angle of the nozzle assembly 12.
The present invention has been described in detail with reference to the specific embodiments, but the present invention is only by way of example and is not limited to the specific embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are intended to be within the scope of the present invention. Accordingly, variations and modifications in equivalents may be made without departing from the spirit and scope of the invention, which is intended to be covered by the following claims.
Claims (10)
1. A supercritical nitrogen quenching circulating cooling system for a vacuum furnace is characterized by comprising a heating chamber (2), a transfer chamber (3) and a quenching chamber (4) which are sequentially arranged, wherein the quenching chamber (4) is a pressure-resistant sealed cavity and is internally provided with a fan (10), a heat exchanger (11) and nozzle assemblies (12) arranged on the periphery of a workpiece (1); the nozzle assembly (12) is communicated with a supercritical tank (8) outside the quenching chamber (4) through a pipeline, and the quenching chamber (4) is communicated with the supercritical tank (8) through a condensing chamber (5), a liquid nitrogen tank (6) and a pressure/temperature regulator (7) through a pipeline.
2. The supercritical nitrogen quench cycle cooling system of claim 1 further comprising a high pressure gas tank (9) connected to the condensing chamber (5), liquid nitrogen tank (6), pressure/temperature regulator (7) and supercritical tank (8), respectively.
3. The supercritical nitrogen quench cycle cooling system of claim 1 wherein the nozzle assembly (12) is comprised of several different sized spray heads with adjustable spray direction and flow rate.
4. The supercritical nitrogen quench cycle cooling system of claim 1 wherein the heat exchanger (11) is arranged between the fan (10) and the workpiece (1) to be quenched.
5. The supercritical nitrogen quench cycle cooling system of claim 4 wherein the heat exchanger (11) is a water/gas heat exchanger.
6. The supercritical nitrogen quench cycle cooling system of claim 1 further comprising:
the temperature sensor is arranged in the quenching chamber (4) and used for monitoring the gas temperature and the surface temperature of the workpiece (1);
a pressure sensor arranged in the quenching chamber (4) and used for monitoring gas pressure;
the flow rate sensor is arranged on the nozzle assembly (12) and used for monitoring the flow rate of each spray head gas; and
and the electromagnetic regulating valve is arranged on the nozzle assembly (12) and is used for regulating the gas injection size of each spray head.
7. The supercritical nitrogen quenching cycle cooling system according to claim 6, further comprising a PID controller for controlling the cooling rate of the workpiece (1), wherein the PID controller is electrically connected with each temperature sensor, pressure sensor, flow rate sensor and electromagnetic regulating valve.
8. The supercritical nitrogen quenching circulation cooling system according to claim 1, wherein the pressure of the supercritical nitrogen in the supercritical tank (8) is not less than 3.4MPa, and the temperature is not less than-146 ℃.
9. The supercritical nitrogen quench cycle cooling system of claim 1 wherein quick-opening doors are provided between the heating chamber (2) and the transfer chamber (3) and between the transfer chamber (3) and the quench chamber (4).
10. The supercritical nitrogen quench cycle cooling system of claim 1 wherein the workpiece (1) is tool steel, die steel or aluminum alloy.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020148148.0U CN211595729U (en) | 2020-01-30 | 2020-01-30 | Supercritical nitrogen quenching circulating cooling system for vacuum furnace |
| PCT/CN2021/074424 WO2021151393A1 (en) | 2020-01-30 | 2021-01-29 | Supercritical nitrogen quenching circulation cooling system for use in vacuum furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020148148.0U CN211595729U (en) | 2020-01-30 | 2020-01-30 | Supercritical nitrogen quenching circulating cooling system for vacuum furnace |
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| CN211595729U true CN211595729U (en) | 2020-09-29 |
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| CN202020148148.0U Expired - Fee Related CN211595729U (en) | 2020-01-30 | 2020-01-30 | Supercritical nitrogen quenching circulating cooling system for vacuum furnace |
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| CN (1) | CN211595729U (en) |
| WO (1) | WO2021151393A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021151393A1 (en) * | 2020-01-30 | 2021-08-05 | 上海复璐帝流体技术有限公司 | Supercritical nitrogen quenching circulation cooling system for use in vacuum furnace |
| CN113373286A (en) * | 2021-05-28 | 2021-09-10 | 吴江市新申铝业科技发展有限公司 | Liquid nitrogen cooling quenching equipment for aluminum alloy section extrusion production and aluminum alloy section cooling quenching process |
| CN114015857A (en) * | 2021-09-22 | 2022-02-08 | 中冶南方工程技术有限公司 | Ultrafast oxidation-free cooling method and device for pentane medium |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI784694B (en) * | 2021-08-31 | 2022-11-21 | 正修學校財團法人正修科技大學 | Method for metal treating |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1758672B1 (en) * | 1968-07-18 | 1970-12-17 | Peddinghaus Paul Ferd Fa | Method and device for surface hardening of strand-shaped workpieces in individual zones extending parallel to the longitudinal axis of the workpiece while avoiding distortion |
| RU2031963C1 (en) * | 1992-11-15 | 1995-03-27 | Институт черной металлургии | Method for production of rolled products of carbide and of alloyed steels having two-phase structure as finely dispersed ferrite and finely dispersed perlite |
| CN101476085B (en) * | 2009-01-08 | 2011-02-09 | 辽宁福鞍铸业集团有限公司 | Method for foundry production of ultra-supercritical main steam control valve for nuclear power unit |
| CN106498136B (en) * | 2016-12-30 | 2018-04-03 | 上海颐柏热处理设备有限公司 | A kind of device of high-pressure liquid or above-critical state quenching |
| CN211595729U (en) * | 2020-01-30 | 2020-09-29 | 洛阳麦透锋科技发展有限公司 | Supercritical nitrogen quenching circulating cooling system for vacuum furnace |
| CN112111630A (en) * | 2020-07-17 | 2020-12-22 | 洛阳耿工金属科技有限公司 | Supersonic air cooling method and device for high-pressure gas quenching vacuum furnace |
| CN111996338A (en) * | 2020-07-24 | 2020-11-27 | 洛阳麦透锋科技发展有限公司 | Gas controllable cooling induction quenching method and device |
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2020
- 2020-01-30 CN CN202020148148.0U patent/CN211595729U/en not_active Expired - Fee Related
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2021
- 2021-01-29 WO PCT/CN2021/074424 patent/WO2021151393A1/en active Application Filing
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021151393A1 (en) * | 2020-01-30 | 2021-08-05 | 上海复璐帝流体技术有限公司 | Supercritical nitrogen quenching circulation cooling system for use in vacuum furnace |
| CN113373286A (en) * | 2021-05-28 | 2021-09-10 | 吴江市新申铝业科技发展有限公司 | Liquid nitrogen cooling quenching equipment for aluminum alloy section extrusion production and aluminum alloy section cooling quenching process |
| CN114015857A (en) * | 2021-09-22 | 2022-02-08 | 中冶南方工程技术有限公司 | Ultrafast oxidation-free cooling method and device for pentane medium |
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| WO2021151393A1 (en) | 2021-08-05 |
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Effective date of registration: 20210128 Address after: 2050 Honghai Road, Miaozhen, Chongming District, Shanghai (Shanghai Miaozhen Economic Development Zone) Patentee after: Shanghai fuludi Fluid Technology Co.,Ltd. Address before: 471132 20 meters from the intersection of Xiaolangdi special line and Axin Avenue, Matun Town, Mengjin County, Luoyang City, Henan Province Patentee before: Luoyang maitoufeng Technology Development Co.,Ltd. |
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