External heating type isothermal quenching and tempering device

Abstract

The embodiment of the utility model relates to the technical field of metal material heat treatment equipment, and provides an external heating type isothermal quenching and tempering device which comprises a box body, and the box body is provided with a quenching tank; the partition cylinder is arranged in the quenching tank, and the wall of the partition cylinder is provided with a flow guide opening; and the first circulating pump extends into the quenching tank and / or the partition cylinder and is used for driving the cooling liquid in the quenching tank to circulate so as to enable the cooling liquid to be isothermal. The flow guide opening comprises an upper flow guide opening and a lower flow guide opening, the upper flow guide opening is communicated with the quenching tank and the upper part in the partition cylinder, and through the technical scheme, the technical problem of inconsistent hardness caused by non-uniform heating of different positions of workpieces in the quenching process in the related technology is solved. The nitrate cooling liquid in the quenching tank can rapidly reach and maintain an isothermal state through the flow guide effect of the flow guide opening in the partition cylinder on the cooling liquid and the forced circulation of the first circulating pump.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the technical field of heat treatment equipment for metallic materials, and more specifically, to an externally heated isothermal quenching and tempering device. Background Technology

[0002] The heat treatment process for workpieces commonly suffers from uneven hardness during quenching and high energy consumption. In traditional equipment, uneven flow of the cooling medium during quenching leads to uneven heating and inconsistent hardness in different parts of the workpiece, as seen in the quenching and tempering of bearing rings. Furthermore, the large amount of residual heat generated during quenching is usually directly discharged, resulting in energy waste. Current technologies lack effective heat recovery systems, failing to effectively utilize the preheating from quenching for tempering or other processes, leading to overall low energy efficiency. Utility Model Content

[0003] To overcome the above-mentioned defects, the embodiments of this disclosure provide an externally heated isothermal quenching and tempering device, which solves the technical problem of uneven heating at different positions of workpieces during the quenching process, resulting in inconsistent hardness.

[0004] According to one aspect, at least one embodiment of this disclosure provides an externally heated isothermal quenching and tempering apparatus, comprising:

[0005] Box body: The box body has a quenching tank;

[0006] Partition cylinder: The partition cylinder is disposed inside the quenching tank, and the cylinder wall has a flow guide port;

[0007] First circulation pump: The first circulation pump extends into the quenching tank and / or the partition cylinder to drive the coolant in the quenching tank to circulate so that the coolant is at an isothermal temperature.

[0008] For example, at least one embodiment of this disclosure provides an externally heated isothermal quenching and tempering device, wherein the flow guide includes an upper flow guide and a lower flow guide, the upper flow guide connects the quenching tank to the upper part of the partition cylinder, and the lower flow guide connects the quenching tank to the lower part of the partition cylinder.

[0009] For example, at least one embodiment of this disclosure provides an externally heated isothermal quenching and tempering device, wherein the bottom or lower part of the partition cylinder has a plurality of arrayed bottom guide holes, and the first circulation pump is an axial flow circulation pump and is disposed in the quenching tank, for circulating coolant in the quenching tank, the upper guide port, the partition cylinder and the lower guide port.

[0010] For example, at least one embodiment of this disclosure provides an externally heated isothermal quenching and tempering apparatus, wherein the upper part of the partition cylinder has a first discharge port, the first discharge port penetrating the housing and thus located outside the housing; further comprising:

[0011] First cover: The first cover is used to cover the first discharge port.

[0012] For example, at least one embodiment of this disclosure provides an externally heated isothermal quenching and tempering apparatus, wherein the housing has a second discharge port, and further includes:

[0013] Draining grid: The draining grid is disposed in the upper part of the quenching tank and located below the second discharge port, and the draining grid is arranged at intervals with the partition cylinder;

[0014] Second cover: The second cover is used to cover the second discharge port;

[0015] First partition: There are several first partitions, which are arranged in the quenching tank to divide the quenching tank. The first partition has a first communication port for communication.

[0016] For example, at least one embodiment of this disclosure provides an externally heated isothermal quenching and tempering device, wherein the second cover is formed by merging two semi-circular covers; the box has a thermal insulation layer and further includes a ventilation heater, which is disposed within the thermal insulation layer.

[0017] For example, at least one embodiment of this disclosure provides an externally heated isothermal quenching and tempering apparatus, wherein the housing further comprises a tempering tank and a plurality of third discharge ports, the third discharge ports being located above the tempering tank, and further comprising:

[0018] Second partition: The second partition is disposed in the tempering tank and divides the tempering tank. The second partition has a second communication port for communication.

[0019] Third cover: The third discharge port is provided with a third cover, which is used to cover the third discharge port.

[0020] For example, at least one embodiment of this disclosure provides an externally heated isothermal quenching and tempering apparatus, which further includes a second circulation pump for circulating the coolant in the tempering tank.

[0021] For example, at least one embodiment of this disclosure provides an externally heated isothermal quenching and tempering apparatus, which further includes:

[0022] Guide pipe: Both the first circulation pump and the second circulation pump are connected to the guide pipe, which is used to guide the coolant pumped by the first circulation pump and the second circulation pump.

[0023] For example, at least one embodiment of this disclosure provides an externally heated isothermal quenching and tempering apparatus, wherein the housing further includes a washing tank, and also includes:

[0024] Steam jetting component: The steam jetting component is installed in the washing liquid tank and is used to place the workpiece in the washing liquid tank for steam cleaning;

[0025] Heat exchange assembly: The heat exchange assembly is configured to exchange heat from the quenching tank to the tempering tank and / or the washing liquid tank;

[0026] Temperature measuring component: The temperature measuring component is configured to measure the temperature of the quenching tank and / or the tempering tank and / or the washing liquid tank.

[0027] The beneficial effects of the embodiments disclosed herein are as follows:

[0028] In this disclosure, the nitrate coolant in the quenching tank can quickly reach and maintain an isothermal state through the guiding effect of the guide port on the baffle and the forced circulation of the first circulation pump. Under this environment, whether it is a regularly shaped bearing ring or other complex-shaped workpieces, all parts of the workpiece can fully contact the coolant at the same temperature during the quenching process, thereby achieving uniform cooling and significantly improving the uniformity of the quenching hardness of the workpiece. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0030] Figure 1 This is a top view of an externally heated isothermal quenching and tempering apparatus according to one embodiment of the present disclosure;

[0031] Figure 2 for Figure 1 A three-dimensional structural schematic diagram of the external heating isothermal quenching and tempering device in the embodiment;

[0032] Figure 3 for Figure 1 Schematic diagram of the sectional structure of the middle AA section;

[0033] Figure 4 for Figure 3 A magnified schematic diagram of part of the B section;

[0034] Figure 5 for Figure 3 A magnified schematic diagram of the C-shaped structure.

[0035] In the figure: box body (100) (including quenching tank (101), second discharge port (102), insulation layer (103), tempering tank (104), third discharge port (105), washing liquid tank (106)), partition cylinder (200) (including guide port (upper guide port (201), lower guide port (202)), bottom guide hole (203), first discharge port (204)), first circulation pump (300), first cover (400), drain grid (500), second cover (600), first partition (700) (including first connecting port (701)), ventilation heater (800), second partition (900) (including second connecting port (901)), third cover (1000), second circulation pump (1100), guide pipe (1200), steam injection component (1300), heat exchange component (1400), temperature measuring component (1500). Detailed Implementation

[0036] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0037] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0038] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0039] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0041] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] like Figures 1-5 As shown, this embodiment illustrates an externally heated isothermal quenching and tempering apparatus. Traditional heat treatment processes for workpieces suffer from drawbacks such as uneven quenching hardness and high energy consumption, primarily due to disordered flow of the cooling medium and ineffective recovery of residual heat. This externally heated isothermal quenching and tempering apparatus aims to precisely control the circulation path and speed of the coolant in the quenching tank through a partition and a first circulating pump, achieving an isothermal effect for the coolant. This ensures uniform heating of all parts of the workpiece and creates favorable conditions for subsequent residual heat recovery, thereby improving the quality and energy efficiency of the heat treatment process.

[0043] In some examples, the housing 100 serves as the main support for the entire device, and the quenching tank 101 inside it uses nitrate as the coolant. Nitrate possesses good thermal conductivity and relatively stable physicochemical properties, providing a suitable cooling environment for workpiece quenching. The housing 100 not only provides physical support for the quenching tank 101, but also has an external insulation layer to reduce heat loss and maintain the thermal stability of the quenching tank 101 during operation.

[0044] A baffle 200 is housed inside the quenching tank 101. The baffle 200 has flow guides 210 distributed along its wall. These flow guides 210 are strategically placed and spaced apart. When the first circulation pump 300 drives the coolant flow, the flow guides 210 guide the coolant to form an orderly circulation pattern. For example, if the coolant enters from the bottom side of the baffle 200, it will spiral upwards along the wall of the baffle 200 under the influence of the flow guides 210, and then diffuse with a uniform flow rate and direction to all areas of the quenching tank 101, thus ensuring a uniform temperature distribution of the coolant within the quenching tank 101.

[0045] One end of the first circulation pump 300 extends into the quenching tank 101 or the baffle 200. This pump can be configured with different power and flow rates to meet the requirements of different workpieces during quenching, considering the required coolant circulation speed and pressure. When the first circulation pump 300 is turned on, it draws coolant from a specific location in the quenching tank 101, such as from the area near the baffle 200 at the bottom of the quenching tank 101. The coolant is then pressurized by the pump body and sprayed at high speed into the baffle 200 or other areas of the quenching tank 101. When quenching bearing rings, the first circulation pump 300 can quickly circulate the coolant, ensuring uniform cooling of the bearing rings in the nitrate coolant and preventing inconsistent hardness caused by differences in localized cooling rates.

[0046] Through the guiding effect of the coolant via the guide port 210 on the baffle 200 and the forced circulation of the first circulation pump 300, the nitrate coolant in the quenching tank 101 can quickly reach and maintain an isothermal state. In this environment, whether it's a regularly shaped bearing ring or other complex-shaped workpieces, all parts can fully contact the coolant at a uniform temperature during the quenching process, thus achieving uniform cooling and significantly improving the uniformity of the workpiece's quenching hardness. Actual testing shows that the hardness deviation range of bearing rings treated with this device is significantly reduced compared to traditional processes, greatly improving the stability and consistency of product quality.

[0047] The isothermal stability of the coolant facilitates the design and integration of subsequent waste heat recovery systems. Because the isothermal coolant maintains a relatively stable temperature after quenching and is easy to measure and control, the heat carried by the coolant can be calculated and utilized more accurately when designing waste heat recovery devices. For example, it can be introduced into the preheating stage of the tempering process or used in other processes requiring preheating, thus laying the foundation for reducing overall energy consumption.

[0048] Consider integrating a high-efficiency waste heat recovery device into the enclosure 100. For example, a high-efficiency heat exchanger can be installed between the quenching tank 101 and the tempering tank. Through a pipeline connection, the high-temperature nitrate coolant after quenching can be introduced into the heat exchanger to exchange heat with the low-temperature workpiece or tempering medium in the tempering tank, achieving effective heat transfer and reducing dependence on external energy sources during the tempering process. Simultaneously, temperature sensors and flow control valves can be equipped on the heat exchanger to control the heat transfer efficiency and coolant flow rate during the heat exchange process according to the real-time requirements of the tempering process.

[0049] The guide port 210 can be used to make the circulation of coolant in the quenching tank 101 more efficient and uniform, further improving the consistency of the quenching hardness of the workpiece. In addition, a turbulence structure, such as a spiral baffle, can be set inside the baffle 200 to further enhance the mixing effect of the coolant and make the isothermal effect more ideal.

[0050] In some examples, the upper guide port 201 and lower guide port 202 on the wall of the baffle 200 serve as guide ports for coolant at different levels. The upper guide port 201 connects the quenching tank 101 with the upper part of the baffle 200. Its opening shape can be designed as a long strip, and the opening direction can be horizontal or diagonally upward. This design allows the coolant flowing from the quenching tank 101 to enter the upper part of the baffle 200 in a rotating manner, enhancing the turbulence and mixing of the coolant in this area.

[0051] The lower guide port 202 connects the quenching tank 101 with the lower part of the partition cylinder 200. The opening direction of the lower guide port 202 is also horizontal or obliquely downward, so that the coolant flowing in from the bottom of the quenching tank 101 can impact the original coolant in the lower part of the partition cylinder 200 at a specific angle, promote the tumbling and mixing of the lower coolant, and thus enhance the convection circulation with the upper coolant.

[0052] The differentiated design of the upper guide port 201 and the lower guide port 202 guides the coolant to form a more orderly and efficient convection circulation pattern between the quenching tank 101 and the baffle 200. The upper guide port 201 causes the coolant to form a rotating flow in the upper part of the baffle 200, while the lower guide port 202 induces impact mixing of the coolant in the lower part. The synergistic effect of the two greatly enhances the temperature uniformity of the coolant throughout the quenching zone.

[0053] Because the coolant exhibits a more uniform and stable temperature distribution during quenching, the residual heat distribution after quenching is also more regular. This allows for more precise calculation and utilization of residual heat during recovery. For example, when applying residual heat to the tempering process, the introduced residual heat can be more accurately controlled according to the required tempering temperature, reducing temperature fluctuations during tempering and improving the efficiency of residual heat utilization.

[0054] Consider installing different types of auxiliary flow-dispersing structures at the upper part near the upper guide port 201 and the lower part near the lower guide port 202 inside the baffle 200. For example, a spiral baffle is installed at the upper part to enhance the rotation effect of the coolant; a mesh baffle is installed at the lower part to further enhance the impact mixing of the coolant. Through the synergistic effect of these auxiliary structures and the guide ports, the circulation effect of the coolant is optimized, and the quenching quality of the workpiece is improved.

[0055] In some examples, the bottom or lower part of the partition cylinder 200 is provided with a plurality of bottom guide holes 203 arranged in an array. These bottom guide holes 203 can be circular in shape, with the diameter set according to actual needs, and are arranged in a regular matrix in the bottom or lower part of the partition cylinder 200. The spacing between adjacent guide holes is consistent. The array distribution design allows the coolant flowing upward from the bottom of the quenching tank 101 to enter the lower part of the partition cylinder 200 evenly through the bottom guide holes 203, increasing the flow diversity of the coolant in this area and promoting thorough mixing with the coolant flowing in through the lower guide port 202.

[0056] The first circulating pump 300 is an axial flow circulating pump, installed inside the quenching tank 101. The axial flow circulating pump features a large flow rate and strong axial thrust. When its impeller rotates, it can push a large amount of coolant in the axial direction. The inlet of the axial flow circulating pump is located at the bottom of the quenching tank 101 near the partition cylinder 200, and the outlet faces the upper part of the quenching tank 101 near the partition cylinder 200. When the axial flow circulating pump starts, it draws coolant from the bottom of the quenching tank 101 and pushes the coolant at high speed along the axial direction to the upper part of the quenching tank 101. A portion of the coolant enters the upper part of the partition cylinder 200 through the upper guide port 201, forming a rotating flow within the partition cylinder 200; the other portion of the coolant mixes with the coolant outside the partition cylinder 200 within the quenching tank 101. Meanwhile, the coolant entering the lower part of the partition cylinder 200 through the lower guide port 202 and the bottom guide hole 203 forms a stronger convection circulation with the upper coolant under the action of the flow field generated by the axial flow circulation pump, thereby enabling the coolant to quickly achieve isothermal conditions in the quenching tank 101 and the partition cylinder 200.

[0057] The synergistic effect of the bottom guide hole 203 and the axial flow circulation pump greatly optimizes the circulation path and mixing effect of the coolant. The coolant can mix more quickly and evenly in the quenching tank 101 and the baffle 200, further reducing the temperature difference throughout the quenching area. Through actual testing, it was found that with this structure, the hardness deviation of different parts of the workpiece was significantly improved, resulting in better product quality consistency compared to when only upper and lower guide holes were used.

[0058] Because the coolant achieves isothermal conditions more quickly and with a more uniform and stable temperature distribution, the residual heat after quenching is also more evenly distributed and easier to utilize. This allows for more efficient transfer of residual heat to other process stages, such as the tempering process, during subsequent waste heat recovery. For example, in the tempering preheating stage, using the residual heat from quenching after quenching can reduce the fluctuation range of the tempering temperature, improving the efficiency and stability of waste heat recovery and further reducing overall energy consumption.

[0059] In some examples, a first discharge port 204 is provided at the upper part of the partition cylinder 200. The shape of the first discharge port 204 can be designed to be circular or square, and its size is planned according to the size of common workpieces to ensure that various workpieces requiring quenching can pass through smoothly. The first discharge port 204 penetrates through the box body 100 and extends to the outside of the box body, forming a channel from the outside of the box body directly to the inside of the partition cylinder 200. This design allows the operator to conveniently place the workpiece in a specific position inside the partition cylinder 200 for quenching without opening the entire box body.

[0060] The first cover 400 is adapted to the first discharge port 204 and is used to cover the first discharge port 204. The cover is designed to be rotatable, so as to be easy to open when discharging material and close in time after discharging.

[0061] The design of the first discharge port 204 significantly improves the ease of operation for placing workpieces into the partition cylinder 200. Operators can directly insert workpieces from outside the box through the discharge port without complicated opening operations, saving time and labor costs. Especially in mass production, this can greatly improve production efficiency.

[0062] After the material is unloaded, the first cover 400 promptly covers the first discharge port 204, effectively reducing heat loss from the quenching tank 101 through sealing. This helps maintain a stable temperature within the quenching tank 101, allowing the coolant to remain in an isothermal state, thereby further improving the uniformity of the workpiece's quenching hardness. Actual testing showed that using this discharge port and cover structure reduced the temperature fluctuation range within the quenching tank 101 compared to when this structure was not present, resulting in a significant improvement in the workpiece's quenching quality.

[0063] In some examples, a second discharge port 102 is provided on the housing 100. A second cover 600 fits snugly into the second discharge port 102 and can be connected to the housing 100 via hinges, similar to a door structure, for easy opening and closing. When closed, a good sealing effect is achieved through magnetic sealing or a rubber sealing ring to prevent heat loss during quenching.

[0064] The drain grid 500 is positioned at the upper part of the quenching tank 101, directly below the second discharge port 102. The spacing between its grid bars is designed to prevent quenched workpieces from falling off while allowing the nitrate coolant to drain smoothly. The drain grid 500 and the baffle cylinder 200 are arranged alternately, providing a platform for temporary storage and drainage of workpieces before and after quenching.

[0065] There are multiple, for example six, first partitions 700, made of a heat-resistant and corrosion-resistant alloy material. These first partitions 700 divide the quenching tank 101 into multiple independent first partition areas, each serving as an independent quenching zone. Each first partition 700 is provided with a first connecting port 701, the shape of which can be circular or square, and the size is determined according to the size of the quenching tank 101 and the flow rate requirements of the nitrate coolant. When the first circulating pump 300 is working, the nitrate solution circulates in the pipes, forming a uniform hydrodynamic field between the various first partition areas through the first connecting ports 701. For example, the diameter of the first connecting ports 701 needs to ensure that the nitrate solution can flow smoothly between the areas, thereby ensuring uniform cooling of each layer of workpieces within the multi-layer material frame composed of the first partitions 700.

[0066] The combined design of the second discharge port 102 and the drain grid 500 greatly improves the ease of operation for workpieces entering and exiting the quenching tank. Before quenching, the workpiece can be placed directly on the drain grid 500 through the second discharge port 102 and then transferred to the quenching area; after quenching, the workpiece can be placed on the drain grid 500 again for draining, reducing the amount of residual nitrate coolant on the workpiece surface. This not only improves work efficiency but also avoids the impact of residual coolant on subsequent processes.

[0067] The first partition 700 divides the quenching tank 101 into multiple independent quenching zones, and works in conjunction with the first circulating pump 300 through the first connecting port 701 to form a uniform and stable hydrodynamic field in each zone. Regardless of which independent quenching zone the workpiece is placed in, it can receive uniform cooling during the quenching process, effectively solving the problem of uneven cooling of workpieces in different zones.

[0068] In some examples, the second cover 600 consists of two semi-circular covers, each made of a high-temperature resistant and heat-insulating material, such as a high-strength alloy with added ceramic fibers. The edges of the semi-circular covers are designed with sealing grooves, within which high-temperature resistant rubber sealing rings are installed. When the two semi-circular covers are joined together, they are tightly connected by bolts or clips, achieving a seal on the second discharge port 102. A heat-insulating gasket can also be placed at the joint of the two semi-circular covers to prevent heat loss. The semi-circular covers are connected to the housing 100 via movable hinges for easy opening and closing. A handle can be used for assistance during operation, making the opening and closing of the semi-circular covers even easier and more convenient.

[0069] The insulation layer 103 of the enclosure 100 is located between the inner and outer walls of the enclosure. The insulation layer 103 is filled with insulation material, such as rock wool, glass wool, or polyurethane foam. These insulation materials have good thermal insulation properties and can effectively prevent heat from being conducted away through the enclosure walls. The thickness of the insulation layer 103 is determined according to actual needs, generally between 5 and 10 centimeters, to ensure sufficient thermal insulation.

[0070] A ventilation heater 800 is installed within the insulation layer 103 and consists of a heating element and a ventilation device. The heating element can be a resistance wire or an infrared heating tube, while the ventilation device can be a small fan. The ventilation heater 800 is connected to the control system via a temperature sensor and can automatically adjust the heating power and ventilation volume according to temperature changes within the quenching tank 101. When the temperature sensor detects a drop in temperature within the quenching tank 101, the control system activates the ventilation heater 800, the heating element begins operation, and the ventilation device circulates the heated air within the insulation layer 103 to maintain a stable temperature within the insulation layer 103, thereby reducing heat loss from the quenching tank 101.

[0071] The two semi-circular covers of the second cover 600 significantly improve the operational flexibility of workpiece loading and unloading, especially suitable for large or irregularly shaped workpieces. At the same time, the combined sealing structure effectively reduces heat loss from the second discharge port 102. Compared with the traditional integral cover, the sealing effect is improved, further stabilizing the temperature of the quenching environment and helping to improve the consistency of workpiece quenching quality.

[0072] The combination of the insulation layer 103 and the ventilation heater 800 significantly improves the insulation performance and temperature stability of the device. The insulation material within the insulation layer 103 effectively reduces heat conduction loss, while the ventilation heater 800 can promptly replenish the heat lost due to heat dissipation. This not only ensures the stability of the quenching process but also improves energy efficiency, resulting in reduced energy consumption compared to insulation structures without ventilation heaters.

[0073] In some examples, a tempering tank 104 is provided inside the housing 100. The tempering tank 104 uses nitrate as the tempering medium, utilizing the good thermal conductivity of nitrate to achieve uniform heating of the workpiece. Several third discharge ports 105 are provided above the tempering tank 104, the number and size of which are determined according to the size and batch of workpieces in actual production. These third discharge ports need to facilitate operators to quickly place the quenched workpieces into the appropriate position in the tempering tank 104.

[0074] The tempering tank 104 is equipped with multiple layers of second baffles 900, which are made of high-temperature and corrosion-resistant alloy materials, such as stainless steel or nickel-based alloys. The second baffles 900 divide the tempering tank 104 into multiple tempering zones, increasing the number of workpieces that can be processed per unit volume. Each second baffle 900 is provided with a second connecting port 901. When the nitrate circulates within the tempering tank 104, a uniform fluid field is formed between the various tempering zones through the second connecting ports 901, ensuring consistent nitrate temperature and flow state in each zone, thereby enabling workpieces in different zones to undergo uniform tempering treatment.

[0075] Each third discharge port 105 is equipped with a third cover 1000. The third cover 1000 is sealed to the third discharge port 105 through a sealing gasket to ensure that heat is not lost excessively from the discharge port during tempering. The third cover 1000 can be directly placed on the third discharge port 105 for easy opening and closing. Handles and other auxiliary devices can be used to improve the ease of operation.

[0076] Integrating quenching and tempering processes into the same device reduces the time and labor costs of transferring workpieces between different equipment, thus optimizing the production process. Meanwhile, the multi-layered second baffle 900 design within the tempering tank 104 significantly increases the workpiece throughput per unit volume. Compared to the traditional single tempering tank structure, production efficiency is improved, effectively meeting the needs of large-scale production.

[0077] The synergistic effect of the second partition 900 and the second connecting port 901 ensures that the nitrate salt forms a uniform and stable fluid field among the various tempering zones within the tempering tank 104, guaranteeing a consistent tempering environment for the workpieces in each zone. The effective sealing of the third discharge port 105 by the third cover 1000 reduces heat loss from the discharge port during tempering, helps maintain temperature stability within the tempering tank 104, and further improves the stability and energy efficiency of the tempering process.

[0078] In some examples, a second circulation pump 1100 is installed, typically with the pump's suction inlet located on one side of the bottom of the tempering tank 104. This effectively extracts the nitrate solution, which may contain impurities and has a relatively low temperature at the bottom. The discharge outlet is located at the upper part of the tempering tank 104, near the second baffle 900, ensuring that the discharged nitrate solution impacts the second baffle 900 at a suitable flow rate and angle, promoting mixing and heat transfer of nitrates within each tempering zone.

[0079] Circulation Path and Effect: When the second circulation pump 1100 starts, the nitrate solution is drawn into the pump body from the bottom of the tempering tank 104. After pressurization, it is sprayed at high speed to the upper part of the tempering tank 104. This high-speed flowing nitrate solution first impacts the second baffle 900 near the discharge port, and then flows between the various tempering zones through the second connecting port 901. In this process, the nitrate solutions at different temperatures are thoroughly mixed, making the temperature within the entire tempering tank 104 more uniform. For example, for some complex-shaped or large-sized workpieces placed in different positions in the tempering tank 104, due to the nitrate circulation driven by the second circulation pump 1100, they can all obtain the same tempering temperature, avoiding tempering quality problems caused by local temperature differences.

[0080] The operation of the second circulating pump 1100 significantly improves the temperature uniformity of the nitrate in the tempering tank 104. This improvement ensures that all parts of the workpiece are heated evenly during tempering, greatly enhancing the consistency of tempering quality. Due to the more stable and uniform tempering temperature, the tempering quality of each batch of workpieces can be reliably guaranteed during mass production. The scrap rate during production is significantly reduced, and the stable tempering conditions also lead to a more stable production cycle and effectively improved production efficiency.

[0081] In some examples, one end of the guide pipe 1200 is tightly connected to the outlet of the first circulating pump 300. Extending from the outlet of the first circulating pump, the guide pipe 1200 guides the nitrate coolant to the desired location according to the structural layout of the quenching tank 101 and the partition cylinder 200. For example, the guide pipe can deliver the coolant to the lower part of the partition cylinder 200, enhancing the flow and mixing of the coolant within the partition cylinder and promoting a more uniform temperature within the quenching tank.

[0082] Similarly, the other end of the guide pipe 1200 is connected to the outlet of the second circulation pump 1100. The connection structure is similar to that at the first circulation pump, employing a reliable sealing connection. The guide pipe leading from the outlet of the second circulation pump guides the nitrate coolant to a specific area within the tempering tank 104. For example, the guide pipe can direct the coolant to a higher position within the tempering tank 104, allowing the coolant to impact the second baffle 900 at a suitable angle and speed, promoting the circulation and mixing of nitrates in each tempering zone, and improving the uniformity of the tempering temperature.

[0083] The layout of the guide pipe 1200 within the housing 100 is carefully designed to minimize bends and resistance, ensuring smooth coolant flow. Simultaneously, the diameter of the guide pipe is rationally selected based on the flow rates of the first and second circulation pumps to ensure an appropriate coolant velocity within the pipe. For example, for circulation pumps with higher flow rates, a larger diameter guide pipe is selected to avoid problems such as excessively high flow rates and excessive pressure loss due to an insufficiently small diameter.

[0084] The 1200 guide tube significantly improves the flow of coolant during quenching and tempering. During quenching, more precise coolant guidance further enhances the temperature uniformity within the quenching tank, improving the consistency of workpiece hardness. During tempering, the guide tube helps to achieve a more balanced temperature across different areas of the tempering tank, further improving tempering quality and resulting in more stable workpiece performance.

[0085] By standardizing the coolant flow path through guide pipes, localized overheating or undercooling caused by uncontrolled coolant flow is reduced, improving the stability of the entire heat treatment system. This results in more stable quenching and tempering process parameters during long-term operation, eliminating the need for frequent adjustments, reducing operator workload, and minimizing product quality issues caused by process fluctuations, thereby increasing production efficiency and product qualification rate.

[0086] In some examples, the washing solution tank 106 is located in a suitable position within the housing 100, and its material is stainless steel that is resistant to acid and alkali corrosion, in order to adapt to the environment of the cleaning solution and steam.

[0087] The steam spray unit 1300 is installed inside the washing solution tank 106. The steam spray unit can be a steam nozzle with multiple fine orifices, and the steam source is connected to the steam spray unit via a pipe. When the workpiece needs cleaning, the steam valve is opened, and high-temperature steam is evenly sprayed from the fine orifices of the steam spray unit, covering the workpiece from all directions and cleaning its surface. For example, the steam nozzle can be installed at the top of the washing solution tank, spraying steam downwards to ensure that all parts of the workpiece are rinsed by steam. Simultaneously, a drain outlet can be provided at the bottom of the washing solution tank to drain wastewater after cleaning.

[0088] The heat exchange assembly 1400 mainly consists of a heat exchanger and connecting pipes. The heat exchanger is a high-efficiency plate heat exchanger, which is characterized by its small size and high heat exchange efficiency.

[0089] The heat exchanger is connected to the quenching tank 101, tempering tank 104, and washing tank 106 via high-temperature and corrosion-resistant pipes. A pipe leading from the quenching tank 101 transports the high-temperature nitrate coolant to one side of the heat exchanger, while the tempering tank 104 and washing tank 106 are connected to the other side of the heat exchanger via pipes. Inside the heat exchanger, the high-temperature quenching tank coolant exchanges heat with the low-temperature media in the tempering and washing tanks, raising the temperature in these tanks and achieving waste heat recovery. For example, the piping layout of the heat exchanger can be designed as a counter-current heat exchange method to improve heat exchange efficiency.

[0090] The temperature measuring assembly 1500 employs temperature sensors, which are installed at appropriate locations within the quenching tank 101, tempering tank 104, and washing tank 106. For example, in the quenching tank 101, the temperature sensor can be installed near the baffle 200 to accurately measure the temperature of the coolant during quenching; in the tempering tank 104, the temperature sensor is installed near the second baffle 900 to monitor the temperature of the nitrate salts during tempering; and in the washing tank 106, the temperature sensor is installed near the steam jet to measure the temperature during steam cleaning.

[0091] Temperature sensors are connected to the control system's display panel via signal cables. Operators can view the real-time temperature values ​​of each tank on the display panel and set upper and lower temperature alarm limits according to process requirements. When the temperature of any tank exceeds the set range, the control system will issue an alarm, reminding operators to adjust the equipment parameters promptly.

[0092] The placement of the steam jet components within the cleaning tank allows for highly efficient steam cleaning of the workpieces. The high temperature and impact force of the steam rapidly dissolve and remove residual nitrates and other impurities from the workpiece surface, resulting in significantly improved surface cleanliness and enhancing the subsequent performance and lifespan of the workpiece.

[0093] The heat exchange assembly successfully recovers and reuses the waste heat from the quenching tank. By transferring the heat from the quenching tank to the tempering tank and the washing tank, the tempering tank can reduce its dependence on external energy during the heating process, and the washing tank can also utilize waste heat for heating, thus reducing overall energy consumption.

[0094] The temperature monitoring system accurately monitors the temperature of each tank in real time, allowing operators to adjust equipment operating parameters promptly based on temperature changes. This ensures that the quenching, tempering, and cleaning processes are carried out under precise temperature control. This significantly improves the stability and reliability of the heat treatment process, resulting in a marked improvement in product quality consistency.

[0095] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. An externally heated isothermal quenching and tempering device, characterized in that, include: Box (100): The box (100) has a quenching groove (101); Partition cylinder (200): The partition cylinder (200) is disposed in the quenching tank (101), and the cylinder wall has a guide port (210). First circulation pump (300): The first circulation pump (300) extends into the quenching tank (101) and / or the partition cylinder (200) to drive the coolant in the quenching tank (101) to circulate so that the coolant is at an isothermal temperature.

2. The externally heated isothermal quenching and tempering device according to claim 1, characterized in that, The guide port (210) includes an upper guide port (201) and a lower guide port (202). The upper guide port (201) connects the quenching tank (101) to the upper part of the partition cylinder (200), and the lower guide port (202) connects the quenching tank (101) to the lower part of the partition cylinder (200).

3. The externally heated isothermal quenching and tempering device according to claim 2, characterized in that, The bottom or lower part of the partition cylinder (200) has a plurality of arrayed bottom guide holes (203). The first circulation pump (300) is an axial flow circulation pump and is disposed in the quenching tank (101) to allow the coolant to circulate in the quenching tank (101), the upper guide port (201), the partition cylinder (200) and the lower guide port (202).

4. The externally heated isothermal quenching and tempering device according to claim 1, characterized in that, The upper part of the partition cylinder (200) has a first discharge port (204), which penetrates the box body (100) and is located outside the box body; it also includes: First cover (400): The first cover (400) is used to cover the first discharge port (204).

5. The externally heated isothermal quenching and tempering device according to claim 3, characterized in that, The housing (100) has a second discharge port (102) and further includes: Drainage grid (500): The drainage grid (500) is disposed in the upper part of the quenching tank (101) and located below the second discharge port (102). The drainage grid (500) and the partition cylinder (200) are arranged at intervals. Second cover (600): The second cover (600) is used to cover the second discharge port (102); First partition (700): There are several first partitions (700) arranged in the quenching tank (101) to divide the quenching tank (101). The first partition (700) has a first communication port (701) for communication.

6. The externally heated isothermal quenching and tempering device according to claim 5, characterized in that, The second cover (600) is formed by merging two semi-circular covers; the box (100) has a thermal insulation layer (103) and also includes a ventilation heater (800), which is disposed inside the thermal insulation layer (103).

7. The externally heated isothermal quenching and tempering device according to claim 4, characterized in that, The housing (100) also has a tempering tank (104) and several third discharge ports (105), the third discharge ports (105) being located above the tempering tank (104), and further includes: Second partition (900): The second partition (900) is disposed in the tempering groove (104) to divide the tempering groove (104), and the second partition (900) has a second communication port (901) for communication. Third cover (1000): The third discharge port (105) is provided with the third cover (1000), which is used to cover the third discharge port (105).

8. The externally heated isothermal quenching and tempering device according to claim 7, characterized in that, It also includes a second circulation pump (1100) for circulating the coolant in the tempering tank (104).

9. The externally heated isothermal quenching and tempering device according to claim 8, characterized in that, Also includes: Guide pipe (1200): The first circulation pump (300) and the second circulation pump (1100) are both connected to the guide pipe (1200), which is used to guide the coolant delivered by the first circulation pump (300) and the second circulation pump (1100).

10. The externally heated isothermal quenching and tempering device according to claim 8, characterized in that, The housing (100) also includes a washing liquid tank (106), and further includes: Steam spraying component (1300): The steam spraying component (1300) is disposed in the washing liquid tank (106) for placing the workpiece in the washing liquid tank (106) for steam cleaning; Heat exchange assembly (1400): The heat exchange assembly (1400) is configured to exchange heat from the quenching tank (101) to the tempering tank (104) and / or the washing liquid tank (106). Temperature measuring component (1500): The temperature measuring component (1500) is configured to measure the temperature of the quenching tank (101) and / or the tempering tank (104) and / or the washing liquid tank (106).

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