Vacuum tempering furnace with rapid cooling function

Abstract

The utility model provides a vacuum tempering furnace capable of rapidly cooling. The tempering furnace comprises a furnace frame, a furnace tank mounted on the furnace frame, a furnace door covering the furnace tank, vacuumizing equipment mounted on the furnace frame and communicated with an inner cavity of the furnace tank, nitrogen filling equipment mounted on the furnace frame and communicated with the inner cavity of the furnace tank, and a heat exchanger mounted on the furnace frame and communicated with the inner cavity of the furnace tank, a closed end cover is arranged at the first end of the flow guide cover, an opening communicated with an inner cavity of the furnace tank is formed in the other end of the flow guide cover, and circulation channels for gas circulation are arranged between the end cover and the furnace tank and between the flow guide cover and the furnace tank. An air inlet of the heat exchanger is communicated with the furnace tank through a first pipe body, an air outlet of the heat exchanger is communicated with the furnace tank through a second pipe body, the first pipe body penetrates through the side wall of the furnace tank and the side wall of the flow guide cover to be inserted into the flow guide cover, and the second pipe body penetrates through the side wall of the furnace tank and extends into a circulation channel between the end cover and the furnace tank.

Description

Technical Field

[0001] This utility model belongs to the field of tempering furnaces, specifically relating to a rapid cooling vacuum tempering furnace. Background Technology

[0002] Tempering is a metal heat treatment process in which a quenched workpiece is reheated to a suitable temperature, held at that temperature for a certain period of time, and then cooled in a medium such as air, water, or oil. It is generally used to reduce or eliminate internal stress in quenched steel parts, reduce hardness and strength, and improve their ductility or toughness. Among them, using a vacuum tempering furnace to temper metal workpieces has the advantages of no oxidation, no decarburization, bright surface, and no corrosion pollution. However, traditional vacuum tempering furnaces mostly rely on natural cooling or single air cooling, which results in slow cooling rate and affects production efficiency. During the cooling process, the cooling gas is blown directly onto the workpiece, causing uneven cooling temperature, and there is also the problem of easy oxidation by air during tempering. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a vacuum tempering furnace with rapid cooling.

[0004] To achieve the above and other related objectives, this utility model provides a rapid cooling vacuum tempering furnace, which includes a furnace frame, a furnace tank mounted on the furnace frame, a furnace door covering the furnace tank, a vacuum pumping device mounted on the furnace frame and communicating with the inner cavity of the furnace tank, a nitrogen filling device mounted on the furnace frame and communicating with the inner cavity of the furnace tank, and a heat exchanger mounted on the furnace frame and communicating with the inner cavity of the furnace tank. The furnace tank is provided with a cylindrical flow guide hood, the first end of which is provided with a sealed end cap, and the other end of which is provided with an opening communicating with the inner cavity of the furnace tank. There are flow channels for gas to flow between the end cap and the furnace tank, and between the flow guide hood and the furnace tank.

[0005] The air inlet of the heat exchanger is connected to the furnace tank through a first pipe, and the air outlet of the heat exchanger is connected to the furnace tank through a second pipe. The first pipe passes through the side wall of the furnace tank and the side wall of the flow guide and is inserted into the flow guide. The second pipe passes through the side wall of the furnace tank and extends into the flow channel between the end cap and the furnace tank.

[0006] Optionally, the vacuuming device is connected to the furnace via a third pipe, and the vacuuming device is a vacuum pump.

[0007] Optionally, the nitrogen filling device includes a nitrogen tank, a pressure reducing valve disposed on the nitrogen tank, and a fourth pipe connecting the pressure reducing valve and the furnace tank.

[0008] Optionally, the first tube is equipped with a first suction pump that draws nitrogen gas from the furnace tank to the heat exchanger.

[0009] As described above, the quick cooling vacuum tempering furnace has the following beneficial effects: when the quick cooling vacuum tempering furnace is used, first, the workpiece to be processed is loaded into the furnace pot, the workpiece is placed neatly to avoid mutual contact. Close the furnace door, check the sealing performance of the equipment, and ensure that there is no leakage. Start the vacuumizing equipment, and vacuumize the inside of the furnace pot to a vacuum state to prevent the workpiece from oxidizing during cooling. Turn off the vacuumizing equipment, start the nitrogen filling equipment, and recharge nitrogen into the furnace pot until the pressure inside the furnace pot reaches normal pressure or slightly higher than normal pressure. Start the heat exchanger to extract nitrogen from the furnace pot, and quickly cool the nitrogen through the heat exchanger. The cooled nitrogen flows back to the flow-through channel between the end cover and the furnace pot through the second pipe body, and then enters the furnace pot through the opening, preventing low-temperature nitrogen from directly blowing to the workpiece. By arranging the flow guide cover, the low-temperature nitrogen can be uniformly circulated to the workpiece, ensuring that the workpiece is quickly and uniformly cooled. After cooling is completed, turn off the heat exchanger and stop the nitrogen circulation. Open the furnace door and take out the processed workpiece. BRIEF DESCRIPTION OF DRAWINGS

[0010] Fig. 1 A front structure schematic view of the quick cooling vacuum tempering furnace is shown.

[0011] Fig. 2 A cross-sectional structure schematic view of the quick cooling vacuum tempering furnace is shown.

[0012] Fig. 3 A side structure schematic view of the quick cooling vacuum tempering furnace is shown. DETAILED DESCRIPTION

[0013] The embodiments of the present application will be described in detail with specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. The present application can also be implemented or applied in different specific embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. When describing the embodiments of the present application, the cross-sectional view of the device structure is partially enlarged without following the general proportion, and the schematic view is only an example, which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in the actual manufacture.

[0014] For the sake of convenience, the terms "under", "below", "lower", "beneath", "above", "upper" and the like can be used herein to describe one element or feature's relationship to another element or feature as the device is used or operated in a particular orientation. The spatially relative terms are intended to encompass different orientations of the device in use or operation, for example, in the case of the device being inverted or rotated relative to the depicted orientation.

[0015] Need to explain, the embodiment provided by the diagram only in a schematic way illustrates the basic idea of the utility model, the drawing only shows the component related to the utility model in the actual implementation, not according to the number, shape and size of component draw, the type, quantity and proportion of each component in actual implementation can be a kind of arbitrary change, and its component layout type can be more complex. For the sake of the diagram as simple as possible, all the structures in each drawing are not all marked.

[0016] As Figs. 1-3 The embodiment provides a vacuum tempering furnace for rapid cooling, which comprises a furnace frame 11, a furnace tank 12 installed on the furnace frame 11, a furnace door 13 covering the furnace tank 12, a vacuumizing device 14 installed on the furnace frame 11 and communicating with the inner cavity of the furnace tank 12, a nitrogen filling device 15 installed on the furnace frame 11 and communicating with the inner cavity of the furnace tank 12, and a heat exchanger 16 installed on the furnace frame 11 and communicating with the inner cavity of the furnace tank 12. The furnace tank 12 is provided with a cylindrical flow guide cover 17, the first end of the flow guide cover 17 is provided with a sealed end cover 18, the other end of the flow guide cover 17 is provided with an opening 19 communicating with the inner cavity of the furnace tank 12, and a flow channel 20 for gas flow is arranged between the end cover 18 and the furnace tank 12 and between the flow guide cover 17 and the furnace tank 12.

[0017] The gas inlet of the heat exchanger 16 communicates with the furnace tank 12 through a first pipe body 21, and the gas outlet of the heat exchanger 16 communicates with the furnace tank 12 through a second pipe body 22, the first pipe body 21 penetrates through the side wall of the furnace tank 12 and the side wall of the flow guide cover 17 and is inserted into the flow guide cover 17, and the second pipe body 22 penetrates through the side wall of the furnace tank 12 and extends into the flow channel 20 between the end cover 18 and the furnace tank 12.

[0018] When the vacuum tempering furnace for rapid cooling is used, first, the workpiece to be treated is loaded into the furnace pot 12, and the workpiece is placed in order to avoid mutual contact. The furnace door 13 is closed, the sealing of the equipment is checked, and no leakage is ensured. The vacuumizing equipment 14 is started, the inside of the furnace pot 12 is vacuumized, and the workpiece is prevented from being oxidized during the cooling process. The vacuumizing equipment 14 is closed, the nitrogen filling equipment 15 is started, nitrogen is filled into the furnace pot 12, and the pressure inside the furnace pot 12 reaches normal pressure or slightly higher than normal pressure. The heat exchanger 16 is started to extract the nitrogen in the furnace pot 12 and rapidly cool the nitrogen through the heat exchanger 16. The cooled nitrogen flows back to the flow passage 20 between the end cover 18 and the furnace pot 12 through the second pipe body 22, and then enters the furnace pot 12 through the opening 19, so as to prevent the low-temperature nitrogen from directly blowing to the workpiece. By arranging the flow guide cover 17, the low-temperature nitrogen can be uniformly guided and circulated to the workpiece, so as to ensure that the workpiece is rapidly and uniformly cooled. After the cooling is completed, the heat exchanger 16 is closed, and the nitrogen circulation is stopped. The furnace door 13 is opened, and the workpiece treated is taken out.

[0019] Specifically, the vacuumizing equipment 14 is communicated with the furnace pot 12 through a third pipe body, and the vacuumizing equipment 14 is a vacuumizing pump.

[0020] In the embodiment, the nitrogen filling equipment 15 comprises a nitrogen tank, a pressure reducing valve arranged on the nitrogen tank, and a fourth pipe body communicating the pressure reducing valve and the furnace pot 12.

[0021] Further, the first pipe body 21 is provided with a first air pump for extracting the nitrogen in the furnace pot 12 to the heat exchanger 16. The first air pump extracts the nitrogen from the furnace pot 12, and after the nitrogen is cooled in the heat exchanger 16, the nitrogen is returned to the furnace pot 12 through the second pipe body 22.

[0022] The above embodiment only exemplarily illustrates the principle and effect of the utility model, and is not used for limiting the utility model. Any person skilled in the art can modify or change the above embodiment without departing from the spirit and category of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A rapid cooling vacuum tempering furnace, characterized in that, The tempering furnace includes a furnace frame, a furnace tank mounted on the furnace frame, a furnace door covering the furnace tank, a vacuum pump mounted on the furnace frame and communicating with the inner cavity of the furnace tank, a nitrogen filling device mounted on the furnace frame and communicating with the inner cavity of the furnace tank, and a heat exchanger mounted on the furnace frame and communicating with the inner cavity of the furnace tank. A cylindrical flow guide hood is provided inside the furnace tank. The first end of the flow guide hood is provided with a sealed end cap, and the other end of the flow guide hood is provided with an opening communicating with the inner cavity of the furnace tank. Flow channels for gas flow are provided between the end cap and the furnace tank, and between the flow guide hood and the furnace tank. The air inlet of the heat exchanger is connected to the furnace tank through a first pipe, and the air outlet of the heat exchanger is connected to the furnace tank through a second pipe. The first pipe passes through the side wall of the furnace tank and the side wall of the flow guide and is inserted into the flow guide. The second pipe passes through the side wall of the furnace tank and extends into the flow channel between the end cap and the furnace tank.

2. The rapid cooling vacuum tempering furnace according to claim 1, characterized in that, The vacuum pump is connected to the furnace via a third pipe.

3. The rapid cooling vacuum tempering furnace according to claim 1, characterized in that, The nitrogen filling equipment includes a nitrogen tank, a pressure reducing valve disposed on the nitrogen tank, and a fourth pipe connecting the pressure reducing valve and the furnace tank.

4. The rapid cooling vacuum tempering furnace according to claim 1, characterized in that, The first tube is equipped with a first suction pump that draws nitrogen gas from the furnace tank to the heat exchanger.

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