Low-temperature cryogenic tempering integrated furnace

Abstract

The utility model relates to the field of heat treatment equipment. A low-temperature cryogenic tempering integrated furnace comprises a furnace body, a heating rod and a temperature control system, the furnace body comprises a double-layer furnace shell and an inner container, the double-layer furnace shell comprises an inner layer and an outer layer, and a heat preservation structure is arranged between the inner layer and the outer layer; the two sides of the inner container are respectively provided with a heating rod, and the device further comprises a liquid nitrogen distribution system and a liquid nitrogen container. According to the utility model, the low tempering temperature is realized by adopting the heating rod, and deep cooling is realized by adopting a liquid nitrogen evaporation refrigeration technology, so that an expected tempering furnace temperature control index is achieved; a thickened heat preservation structure is adopted between the inner layer and the outer layer, so that energy consumption is effectively reduced, and the effects of energy conservation and emission reduction are achieved; and after being gasified and refrigerated, the liquid nitrogen is recycled through a pipeline, so that nitrogen is effectively utilized, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of heat treatment equipment, in particular to a tempering furnace. Background Art

[0002] Tempering furnaces are mainly used for low-temperature tempering, aging or deep cooling of metal materials. Generally, low-temperature tempering is achieved by heating the temperature to a maximum of +400 degrees Celsius through a heating rod, which requires a large amount of electrical energy; deep cooling is achieved by evaporating liquid nitrogen, which is generally consumed once.

[0003] With the continuous upgrading of domestic industrial industries, there are increasingly higher requirements for energy saving, consumption reduction and multi-purpose of equipment. Therefore, it is necessary to upgrade the technology of tempering furnaces, reduce heating energy consumption, and recycle liquid nitrogen used for refrigeration for secondary use. Utility Model Content

[0004] The purpose of the utility model is to provide a low-temperature deep-cold tempering integrated furnace to solve the above technical problems.

[0005] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0006] A low-temperature deep-cold tempering integrated furnace comprises a furnace body, a heating rod and a temperature control system, wherein the furnace body comprises a double-layer furnace shell and an inner tank, the double-layer furnace shell comprises an inner layer and an outer layer, and a composite insulation layer is arranged between the inner layer and the outer layer; heating rods are respectively arranged on both sides of the inner tank, and each heating rod is arranged between the inner tank and the double-layer furnace shell; the heating rods are connected to a driving power supply; a liquid nitrogen distribution system and a liquid nitrogen container are also included; the liquid nitrogen distribution system comprises a liquid nitrogen delivery pipeline and an electronic regulating valve arranged in the liquid nitrogen delivery pipeline; the liquid nitrogen input port of the liquid nitrogen distribution system is connected to the liquid nitrogen container; the liquid nitrogen output port of the liquid nitrogen distribution system is connected to a liquid nitrogen evaporator; the signal output end of the temperature control system is connected to the control signal input end of the driving power supply and the control switch signal input end of the electronic regulating valve.

[0007] The heating rod combined with the temperature control system can maintain the temperature of the tempering furnace to a low-temperature tempering temperature of +400°C, and the mechanism of absorbing heat energy when liquid nitrogen evaporates can allow the tempering furnace to reach a deep cold temperature of -160°C. There is a composite insulation structure between the double-layer furnace shells. Regardless of the temperature inside the equipment, the temperature outside the equipment is basically the same as the ambient temperature, with low energy loss, which can effectively save energy and reduce emissions.

[0008] Furthermore, the inner tank has a guide structure at the top, which includes a convection fan, a turbo fan and an air duct; the convection fan is located at the top of the double-layer furnace shell, the fan shaft passes through the air duct, and the turbo fan is installed at the end of the fan shaft.

[0009] The flow guide system is used for air circulation during cooling and heating to ensure the temperature uniformity of the equipment, so that each workpiece in the inner tank can be at a similar temperature.

[0010] Furthermore, a liquid nitrogen evaporator is arranged in the interlayer between the inner tank and the air duct, and stainless steel fins are arranged on the liquid nitrogen evaporator.

[0011] The liquid nitrogen evaporator is arranged in the interlayer between the inner tank and the air duct, and stainless steel fins are additionally arranged on the liquid nitrogen evaporator, both of which are for utilizing the thermal conductivity of stainless steel metal for evaporative cooling of liquid nitrogen.

[0012] Furthermore, it also includes a nitrogen recovery system, which includes a nitrogen recovery port, a recovery pipeline and a high-pressure gas storage tank, and the high-pressure gas storage tank is provided with an insulation layer; the input side of the recovery pipeline is connected to the nitrogen recovery port, and the output side of the recovery pipeline is connected to the high-pressure gas storage tank.

[0013] There is boost pressure in the liquid nitrogen container. Driven by pressure, the liquid nitrogen reaches the liquid nitrogen evaporator through the liquid nitrogen delivery pipeline. After being vaporized in the liquid nitrogen evaporator, the gaseous nitrogen continues to flow to the nitrogen recovery port under pressure drive. The nitrogen recovery port reaches the high-pressure gas storage tank through the recovery pipeline and is collected centrally. The collected nitrogen can be reused.

[0014] Furthermore, the inner layer is made of stainless steel plates that are airtightly welded; the outer layer is made of a profile frame structure, which is covered with cold-rolled steel plates and is rust-proofed.

[0015] The operating temperature of the tempering furnace is in the range of +400℃~-160℃. The stainless steel plate is welded airtightly, which has stability and reliability in high temperature and low cold environment. It can ensure the complete sealing effect in the furnace, reduce the risk of leakage and improve production safety.

[0016] The outer layer adopts profiles, which can effectively reduce the manufacturing cost.

[0017] Furthermore, the composite thermal insulation layer is composed of multiple layers of thermal insulation materials, which are, from the inner layer to the outer layer, high-silica cloth, Teflon, aluminum silicate wool, Teflon, and high-silica cloth.

[0018] High silica cloth and Teflon, with a thickness of 0.4mm, can play a flame retardant role. Aluminum silicate wool is filled in the middle, followed by Teflon and high silica cloth. The composite structure is sewn with an industrial sewing machine.

[0019] The main component of aluminum silicate wool is aluminum silicate, which is non-flammable and high temperature resistant. The operating temperature of aluminum silicate wool is between 800℃ and 1600℃.

[0020] Furthermore, four heating rods are alternately arranged on both sides of the inner tank.

[0021] The heating rods and liquid nitrogen delivery pipelines are staggered, preferably set on both sides of the inner tank. The staggered arrangement can prevent heat from accumulating and concentrating in one place, making the heat distribution more even.

[0022] Furthermore, a furnace door lifting mechanism is also included.

[0023] The furnace door lifting mechanism can replace manual flipping of the furnace door, which is beneficial to improving production efficiency. When opening and closing the furnace door, the operator does not need to stand near the furnace body, which can improve production safety.

[0024] Furthermore, the furnace door lifting mechanism includes a furnace door lifting frame composed of C-shaped steel, and a power device arranged on the upper part of the furnace door lifting frame; the furnace door lifting frame is fixedly connected to the shell, the power arm of the power device is connected to the upper end of the furnace door, and the furnace door moves up and down along the grooves of the C-shaped steel on both sides.

[0025] Two vertical C-shaped steels are arranged on both sides of the furnace door to form guide rails for accommodating the lifting of the furnace door. The vertical C-shaped steels are fixed to the shell through the furnace door clamping parts, and two horizontal C-shaped steels are fixedly connected to both ends of the vertical C-shaped steels to form a stable frame structure.

[0026] A power device is arranged on the C-shaped steel at the top of the frame structure. The power device can select a pneumatic cylinder, a hydraulic cylinder or an electric cylinder. The power arm of the power device is connected to the upper end of the furnace door. After the power device is started, the power arm can lift or lower the furnace door.

[0027] Furthermore, the power device is a bidirectional power cylinder; and a furnace door cover is arranged downward on the top of the furnace door lifting frame.

[0028] The preferred power device is a bidirectional power cylinder. Pneumatic cylinders have the characteristics of low cost, simple structure, high reliability, etc., and are more suitable for working in harsh environments.

[0029] The function of the furnace door cover is to cover the furnace door after it is lifted to prevent the high temperature remaining on the furnace door from touching the staff.

[0030] The utility model adopts a heating rod to achieve the low-temperature tempering temperature, and realizes deep cooling through the liquid nitrogen evaporation refrigeration technology, thereby achieving the expected temperature control index of the tempering furnace; a thickened insulation structure is adopted between the inner and outer layers, which effectively saves energy consumption and achieves the effect of energy saving and emission reduction; after the liquid nitrogen is gasified and refrigerated, it is recovered through a pipeline, which effectively utilizes nitrogen, reduces production costs, obtains beneficial technical effects, and has certain progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0032] Figure 1 It is a partial cross-sectional view of the utility model;

[0033] Figure 2 It is a front view of the utility model;

[0034] Figure 3 It is a side view schematic diagram of the utility model;

[0035] Figure 4 This is a thermal insulation structure diagram of the utility model.

[0036] Explanation of symbols:

[0037] 1. Double-layer furnace shell; 2. Inner tank; 3. Composite insulation layer; 4. Guide structure; 5. Heating rod; 6. Liquid nitrogen distribution system; 8. Furnace door; 9. Furnace door clamp; 10. Two-way power cylinder; 11. Power arm; 12. Furnace door cover; 13. Convection fan; 14. Nitrogen recovery port; 15. High silica cloth; 16. Teflon; 17. Aluminum silicate wool. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned purposes, features and advantages of the present invention more understandable, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0040] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0041] Secondly, the "one embodiment" or "embodiment" referred to herein refers to a specific feature, structure or characteristic that can be included in at least one implementation of the utility model. The "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0042] Example 1

[0043] Reference Figure 1 As shown, the low-temperature deep-cold tempering integrated furnace includes a furnace body, a heating rod 5 and a temperature control system. The furnace body includes a double-layer furnace shell 1 and an inner tank 2. The double-layer furnace shell 1 includes an inner layer and an outer layer, and a composite insulation layer 3 is provided between the inner layer and the outer layer; heating rods 5 are respectively arranged on both sides of the inner tank 2, and each heating rod 5 is arranged between the inner tank 2 and the double-layer furnace shell 1; the heating rod 5 is connected to a driving power supply; it also includes a liquid nitrogen distribution system 6 and a liquid nitrogen container; the liquid nitrogen distribution system 6 includes a liquid nitrogen delivery pipeline and an electronic regulating valve arranged in the liquid nitrogen delivery pipeline; the liquid nitrogen input port of the liquid nitrogen distribution system 6 is connected to the liquid nitrogen container; the liquid nitrogen output port of the liquid nitrogen distribution system 6 is connected to the liquid nitrogen evaporator; the signal output end of the temperature control system is connected to the control signal input end of the driving power supply and the control switch signal input end of the electronic regulating valve.

[0044] In this embodiment, the heating rod 5 is combined with the temperature control system to maintain the temperature of the tempering furnace at a low-temperature tempering temperature of +400°C, and the tempering furnace can reach a deep-cold temperature of -160°C by utilizing the mechanism that liquid nitrogen absorbs heat energy when evaporating. The composite insulation layer 3 is between the inner layer and the outer layer, and the composite insulation structure is filled. No matter what the temperature inside the equipment is, the temperature outside the equipment is basically equivalent to the ambient temperature, the energy loss is small, and energy saving and emission reduction can be effectively achieved.

[0045] like Figure 1 , Figure 3 As shown, there is a guide structure 4 on the top of the inner tank 2, and the guide structure 4 includes a convection fan 13, a turbo fan and an air duct; the convection fan 13 is located on the top of the double-layer furnace shell 1, the fan shaft passes through the air duct, and a turbo fan is installed at the end of the fan shaft.

[0046] The flow guiding system 4 is used for air circulation during cooling and heating to ensure the temperature uniformity of the equipment, so that each workpiece in the inner tank 2 can be at a similar temperature.

[0047] A liquid nitrogen evaporator is arranged in the interlayer between the inner tank 2 and the air duct; and stainless steel fins are arranged on the liquid nitrogen evaporator.

[0048] The liquid nitrogen evaporator is arranged in the interlayer between the inner tank 2 and the air duct, and stainless steel fins are additionally arranged on the liquid nitrogen evaporator, both of which are for utilizing the thermal conductivity of stainless steel metal for evaporative cooling of liquid nitrogen.

[0049] It also includes a nitrogen recovery system, which includes a nitrogen recovery port 14, a recovery pipeline and a high-pressure gas storage tank, and the high-pressure gas storage tank is provided with an insulation layer; the input side of the recovery pipeline is connected to the nitrogen recovery port 14, and the output side of the recovery pipeline is connected to the high-pressure gas storage tank.

[0050] In this embodiment, there is a boost pressure in the liquid nitrogen container. The liquid nitrogen reaches the liquid nitrogen evaporator through the liquid nitrogen delivery pipeline under pressure driving. After being vaporized in the liquid nitrogen evaporator, the gaseous nitrogen continues to flow to the nitrogen recovery port 14 under pressure driving. The nitrogen recovery port 14 is connected to the recovery pipeline to reach the high-pressure gas storage tank for centralized collection. The collected nitrogen can be reused.

[0051] The inner layer is made of stainless steel plates that are airtightly welded; the outer layer 1 is a profile frame structure that is covered with cold-rolled steel plates and is rust-proofed.

[0052] In this embodiment, the operating temperature of the tempering furnace is in the range of +400℃ to -160℃, and the stainless steel plate is welded airtightly, which has stability and reliability in a high temperature and low temperature environment, can ensure the complete sealing effect in the furnace, reduce the risk of leakage, and improve production safety.

[0053] The outer layer 1 is made of profiles, which can effectively reduce the manufacturing cost.

[0054] Reference Figure 4 As shown, the composite thermal insulation layer 3 is composed of multiple layers of thermal insulation materials, which are, from the inner layer to the outer layer, high silica cloth 15 , Teflon 16 , aluminum silicate wool 17 , Teflon 16 , and high silica cloth 15 .

[0055] In this embodiment, the high-silica cloth 15 and Teflon have a thickness of 0.4 mm. The high-silica cloth 15 and Teflon can play a flame retardant role. Aluminum silicate wool 17 is filled in the middle, followed by Teflon and high-silica cloth 15. The composite structure is sewn with an industrial sewing machine.

[0056] The main component of aluminum silicate wool 17 is aluminum silicate, which has the properties of being non-flammable in open flames and being resistant to high temperatures. The operating temperature of aluminum silicate wool 17 is between 800°C and 1600°C.

[0057] The heating rods 5 are staggeredly arranged in four numbers on both sides of the inner container 2 .

[0058] In this embodiment, the heating rod 5 and the liquid nitrogen delivery pipeline are staggered, preferably arranged on both sides of the inner tank 2. The staggered arrangement can prevent the heat from accumulating and concentrating in a certain place, making the heat distribution more uniform.

[0059] Reference Figure 2 As shown, a furnace door 8 lifting mechanism is also included.

[0060] In this embodiment, the furnace door 8 lifting mechanism can replace manual turning of the furnace door 8, which is beneficial to improving production efficiency. When opening and closing the furnace door 8, the operator does not need to stand near the furnace body, which can improve production safety.

[0061] The furnace door 8 lifting mechanism includes a furnace door 8 lifting frame composed of C-shaped steel, and a power device arranged on the upper part of the furnace door 8 lifting frame; the furnace door 8 lifting frame is fixedly connected to the shell 1, and the power arm 11 of the power device is connected to the upper end of the furnace door 8, and the furnace door 8 moves up and down along the grooves of the C-shaped steel on both sides.

[0062] In this embodiment, two vertical C-shaped steels are arranged on both sides of the furnace door 8 to form guide rails for accommodating the lifting and lowering of the furnace door 8. The vertical C-shaped steels are fixed to the shell 1 through the furnace door clamping parts 9, and two horizontal C-shaped steels are fixedly connected at both ends of the vertical C-shaped steels to form a stable frame structure.

[0063] A power device is arranged on the C-shaped steel at the top of the frame structure. The power device can select a pneumatic cylinder, a hydraulic cylinder or an electric cylinder. The power arm 11 of the power device is connected to the upper end of the furnace door 8. After the power device is started, the power arm 11 can lift the furnace door 8 or lower the furnace door 8.

[0064] The power device is a two-way power cylinder 10; a furnace door cover 12 is arranged downward from the top of the furnace door 8 lifting frame.

[0065] In this embodiment, the preferred power device is a bidirectional power cylinder 10. The pneumatic cylinder has the characteristics of low cost, simple structure, high reliability, etc., and is more suitable for working in harsh environments.

[0066] The function of the furnace door 8 cover is to shield the furnace door 8 after lifting, so as to prevent the high temperature remaining on the furnace door 8 from touching the staff.

[0067] Furthermore, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described, i.e., those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention.

[0068] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, the development effort will be a routine task of design, fabrication, and production without undue experimentation.

[0069] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. Low temperature deep cold tempering integrated furnace, including a furnace body, a heating rod and a temperature control system, the furnace body includes a double-layer furnace shell and an inner tank, the double-layer furnace shell includes an inner layer and an outer layer, characterized in that: A composite thermal insulation layer is provided between the inner layer and the outer layer; Heating rods are arranged on both sides of the inner container, and each heating rod is arranged between the inner container and the double-layer furnace shell; The heating rod is connected to a driving power source; Also included is a liquid nitrogen dispensing system and a liquid nitrogen container; The liquid nitrogen distribution system comprises a liquid nitrogen delivery pipeline and an electronic regulating valve arranged in the liquid nitrogen delivery pipeline; The liquid nitrogen input port of the liquid nitrogen distribution system is connected to the liquid nitrogen container; The liquid nitrogen output port of the liquid nitrogen distribution system is connected to the liquid nitrogen evaporator; The signal output end of the temperature control system is connected to the control signal input end of the driving power supply and the control switch signal input end of the electronic regulating valve.

2. The low temperature deep cooling and tempering integrated furnace according to claim 1, characterized in that: The top of the inner tank is provided with a flow guiding structure, which includes a convection fan, a turbo fan and an air duct; The convection fan is located on the top of the double-layer furnace shell, the fan shaft passes through the air duct, and a turbo fan is installed at the end of the fan shaft.

3. The low temperature deep cooling and tempering integrated furnace according to claim 2, characterized in that: A liquid nitrogen evaporator is arranged in the interlayer between the inner tank and the air duct, and stainless steel fins are arranged on the liquid nitrogen evaporator.

4. The low temperature deep cooling and tempering integrated furnace according to claim 1, characterized in that: It also includes a nitrogen recovery system, which includes a nitrogen recovery port, a recovery pipeline and a high-pressure gas storage tank, and the high-pressure gas storage tank is provided with an insulation layer; the input side of the recovery pipeline is connected to the nitrogen recovery port, and the output side of the recovery pipeline is connected to the high-pressure gas storage tank.

5. The low temperature deep cooling and tempering integrated furnace according to claim 1, characterized in that: The inner layer is formed by airtight welding of stainless steel plates; the outer layer is formed by a profile frame structure, which is covered with cold-rolled steel plates and subjected to rust-proof treatment.

6. The low temperature deep cooling and tempering integrated furnace according to claim 1, characterized in that: The composite thermal insulation layer is composed of multiple layers of thermal insulation materials, which are, from the inner layer to the outer layer, high silica cloth, Teflon, aluminum silicate wool, Teflon, and high silica cloth.

7. The low temperature deep cooling and tempering integrated furnace according to claim 1, characterized in that: The heating rods are arranged in four numbers in an alternating manner on both sides of the inner container.

8. The low temperature deep cooling and tempering integrated furnace according to claim 1, characterized in that: Also includes a furnace door lifting mechanism.

9. The low temperature deep cooling and tempering integrated furnace according to claim 8, characterized in that: The furnace door lifting mechanism includes a furnace door lifting frame composed of C-shaped steel and a power device arranged on the upper part of the furnace door lifting frame; the furnace door lifting frame is fixedly connected to the shell, the power arm of the power device is connected to the upper end of the furnace door, and the furnace door moves up and down along the grooves of the C-shaped steel on both sides.

10. The low temperature deep cooling and tempering integrated furnace according to claim 9, characterized in that: The power device is a bidirectional power cylinder; a furnace door cover is arranged downward from the top of the furnace door lifting frame.

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