A rapid cooling device for sintering of neodymium-iron-boron magnets

Abstract

The utility model discloses a kind of for neodymium-iron-boron magnet sintering's quick cooling device, including inlet-outlet structure and reflux structure, the inlet-outlet structure is set on the furnace body and furnace cover of sintering furnace, it includes first air inlet main pipe, second air inlet main pipe and air outlet pipe, two air inlet main pipes are all provided with an air inlet and multiple evenly distributed air outlets, and every air outlet is connected furnace body by pipeline, it is communicated by first valve between these two air inlet main pipes, the air inlet of first air inlet main pipe is connected with argon gas pipe, the air inlet of second air inlet main pipe is connected with reflux pipe, air outlet pipe is connected on furnace cover, air outlet pipe is connected first exhaust pipe and connecting pipe respectively by tee joint;The quick cooling device of the utility model can make argon simultaneously enter furnace body from multiple positions by setting multiple air outlets on air inlet main pipe, connect the furnace body of sintering furnace, ensure that argon is evenly distributed inside furnace body, to effectively avoid that local temperature difference in furnace body is too large.

Description

Technical Field

[0001] This utility model relates to the field of neodymium iron boron magnet production technology, specifically to a rapid cooling device for sintering neodymium iron boron magnets. Background Technology

[0002] In the production of NdFeB magnets, the sintering process is a crucial step, directly affecting the final performance and quality of the magnets. After sintering, the NdFeB magnets require rapid cooling. The traditional method involves first evacuating the sintering furnace and then introducing flowing argon gas into the furnace to quickly cool the magnets. However, this traditional cooling method has some drawbacks. Uneven distribution of argon gas inside the furnace can lead to excessive localized temperature differences, potentially causing magnet deformation or cracking. Furthermore, traditional cooling methods consume large amounts of argon gas, increasing the production cost of NdFeB magnets. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a rapid cooling device for sintering neodymium iron boron magnets, thereby solving the problems mentioned in the background art.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A rapid cooling device for sintering neodymium iron boron magnets includes an inlet / outlet structure and a reflux structure. The inlet / outlet structure is installed on the furnace body and furnace cover of the sintering furnace. It includes a first inlet main pipe, a second inlet main pipe, and an outlet pipe. Each of the two inlet main pipes is provided with an inlet and multiple evenly distributed outlets. Each outlet is connected to the furnace body through a pipe. The two inlet main pipes are connected to each other through a first valve. The inlet of the first inlet main pipe is connected to an argon gas supply pipe, and the inlet of the second inlet main pipe is connected to a reflux pipe. The outlet pipe is connected to the furnace cover and is connected to a first exhaust pipe and a connecting pipe through a tee.

[0006] The reflux structure includes a filter structure, a heat exchanger, and an air pump. A connecting pipe connects to the inlet of the filter structure, and the outlet of the filter structure is connected to the tube-side inlet of the heat exchanger via a pipe. The tube-side outlet of the heat exchanger is connected to the input end of the air pump via a pipe, and the output end of the air pump is connected to the reflux pipe and the second exhaust pipe via a tee.

[0007] As a preferred embodiment of a rapid cooling device for sintering NdFeB magnets, the filter structure includes a barrel body and a barrel cover. The inlet of the filter structure is located on the side of the barrel body near the bottom, and the outlet of the filter structure is located on the barrel cover. A cup-shaped filter screen is fixed inside the barrel body near the top opening. An air hammer is installed on the outside of the barrel body. An ash discharge port is provided at the bottom of the barrel body, and a gate is installed on the ash discharge port. The barrel cover is installed at the top opening of the barrel body via a flange.

[0008] As a preferred embodiment of a rapid cooling device for sintering NdFeB magnets, the argon supply pipe is equipped with a second valve and a first flow meter.

[0009] As a preferred embodiment of a rapid cooling device for sintering NdFeB magnets, the reflux pipe is equipped with a third valve and a second flow meter.

[0010] As a preferred embodiment of a rapid cooling device for sintering NdFeB magnets, a fourth valve is installed on the first exhaust pipe.

[0011] As a preferred embodiment of a rapid cooling device for sintering NdFeB magnets, a fifth valve is installed on the connecting pipe.

[0012] As a preferred embodiment of a rapid cooling device for sintering NdFeB magnets, a sixth valve is installed on the second exhaust pipe.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The rapid cooling device of this utility model can make argon gas enter the furnace body from multiple positions at the same time by setting multiple gas outlets on the gas inlet pipe to connect the furnace body of the sintering furnace, ensuring that the argon gas is evenly distributed inside the furnace body, thereby effectively avoiding excessive local temperature difference inside the furnace body, preventing the neodymium iron boron magnet from deforming or cracking due to temperature difference, and ensuring the cooling quality of the magnet.

[0015] (2) The rapid cooling device of this utility model can filter and cool argon gas and pump it into the furnace body for recycling by setting up a filter structure, heat exchanger and gas pump, thereby greatly saving argon gas consumption and reducing the production cost of neodymium iron boron magnets. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly described below. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0017] Figure 1This is a schematic diagram of the structure of the rapid cooling device for sintering NdFeB magnets according to this utility model.

[0018] Figure 2 This is a schematic diagram of the structure of the rapid cooling device for sintering NdFeB magnets as described in this utility model from another perspective.

[0019] Figure 3 This is a schematic diagram of the filter structure described in this utility model.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. First main intake pipe; 2. Second main intake pipe; 3. Outlet pipe; 4. First valve; 5. Argon supply pipe; 6. Return pipe; 7. First exhaust pipe; 8. Connecting pipe; 9. Filter structure; 9-1. Barrel body; 9-2. Barrel lid; 9-3. Filter screen; 9-4. Air hammer; 10. Heat exchanger; 11. Air pump; 12. Second exhaust pipe; 13. Furnace body; 14. Furnace lid; 15. Second valve; 16. First flow meter; 17. Third valve; 18. Second flow meter; 19. Fourth valve; 20. Fifth valve; 21. Sixth valve. Detailed Implementation

[0022] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0024] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0025] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example 1:

[0027] like Figures 1 to 3 As shown, this utility model provides a rapid cooling device for sintering neodymium iron boron magnets, including an inlet / outlet structure and a reflux structure. The inlet / outlet structure is installed on the furnace body 13 and furnace cover 14 of the sintering furnace. Specifically, the inlet / outlet structure includes a first inlet main pipe 1, a second inlet main pipe 2, and an outlet pipe 3. The two inlet main pipes are both annular and concentrically arranged, and each inlet main pipe has an inlet and multiple evenly distributed outlets. Each outlet is connected to the furnace body 13 through a pipe. The position of each outlet connected to the furnace body 13 through the pipe can be designed and adjusted according to the actual situation. The two inlet main pipes are connected by a first valve 4. The inlet of the first inlet main pipe 1 is connected to an argon gas supply pipe 5. When argon gas is introduced into the inlet main pipe, the argon gas can enter the furnace body 13 simultaneously from the multiple outlets of the inlet main pipe to ensure that the argon gas is evenly distributed inside the furnace body 13 and to avoid excessive local temperature differences inside the furnace body 13.

[0028] Preferably, a second valve 15 and a first flow meter 16 are also installed on the argon supply pipe 5. By controlling the opening degree of the second valve 15 and cooperating with the first flow meter 16, the flow rate of argon entering the first inlet pipe 1 can be precisely controlled.

[0029] The inlet of the second intake pipe 2 is connected to the return pipe 6. The return pipe 6 is equipped with a third valve 17 and a second flow meter 18, which can control the flow rate of the return argon gas. The outlet pipe 3 is connected to the furnace cover 14. It is connected to the first exhaust pipe 7 and the connecting pipe 8 through a tee. The first exhaust pipe 7 is equipped with a fourth valve 19. The first exhaust pipe 7 can be connected to an external vacuum pump. The connecting pipe 8 is equipped with a fifth valve 20.

[0030] The reflux structure specifically includes a filter structure 9, a heat exchanger 10, and an air pump 11. The filter structure 9 includes a barrel body 9-1 and a barrel cover 9-2. The inlet of the filter structure 9 is located on the side of the barrel body 9-1 near the bottom, and the outlet of the filter structure 9 is located on the barrel cover 9-2. A cup-shaped filter screen 9-3 is fixed inside the barrel body 9-1 near the top opening. It can filter the argon gas entering the barrel body 9-1 and remove dust and other impurities. An air hammer 9-4 is installed on the outside of the barrel body 9-1. The air hammer 9-4 is connected to an external pneumatic system. After the filter structure 9 has been used for a period of time, the filter screen 9-3 can be cleaned by the pneumatic system. Specifically, the air hammer 9-4 can be used to knock the barrel body 9-1, which can make the dust attached to the filter screen 9-3 fall off. A dust discharge port is opened at the bottom of the barrel body 9-1, and a gate is installed on the dust discharge port to facilitate dust cleaning. The barrel cover 9-2 is installed at the top opening of the barrel body 9-1 through a flange.

[0031] The connecting pipe 8 is connected to the inlet of the filter structure 9. The outlet of the filter structure 9 is connected to the tube inlet of the heat exchanger 10 through a pipe. The tube outlet of the heat exchanger 10 is connected to the input end of the air pump 11 through a pipe. The shell inlet and outlet of the heat exchanger 10 are connected to an external circulating water cooling system. The output end of the air pump 11 is connected to the return pipe 6 and the second exhaust pipe 12 through a tee. The second exhaust pipe 12 is connected to an external waste gas treatment device. The sixth valve 21 is installed on the second exhaust pipe 12.

[0032] When using this rapid cooling device, firstly, the fourth valve 19 is opened, and the air inside the furnace body 13 is evacuated by the vacuum pump to reduce residual oxygen. Then, the first valve 4 and the second valve 15 are opened to introduce argon gas into the two main inlet pipes. The argon gas enters the furnace body 13 from the outlet of the two main inlet pipes to protect and initially cool the neodymium iron boron magnets. After a period of time, the third valve 17, the fifth valve 20, the sixth valve 21, and the gas pump 11 are opened, and the first valve 4, the fourth valve 19, and the external vacuum pump are closed. The argon gas in the furnace body 13 enters the filter structure 9 through the outlet pipe 3 and the connecting pipe 8. After filtration, it can re-enter the heat exchanger 10 for cooling. Part of the cooled gas enters the second main inlet pipe 2 through the return pipe 6 and re-enters the furnace body 13 for circulating cooling, while the other part is discharged through the second exhaust pipe 12. At this time, new argon gas and circulating argon gas can enter the furnace body 13 simultaneously for cooling. The operator can reduce the argon gas supply to the argon gas supply pipe 5 according to the actual situation, thereby saving argon gas consumption.

[0033] Example 2:

[0034] In actual operation, depending on the sintering condition and cooling requirements of the NdFeB magnet, the second valve 15 on the argon supply pipe 5 and the sixth valve 21 on the second exhaust pipe 12 can be closed, while the first valve 4 can be opened. The opening and closing states of other valves remain unchanged. The argon gas in the furnace body 13 is circulated by the gas pump 11 and cooled by the heat exchanger 10 in the reflux structure to cool the NdFeB magnet. When it is necessary to replenish protective gas or adjust the atmosphere in the furnace, the second valve 15 and the sixth valve 21 can be opened again to introduce argon gas into the gas inlet pipe.

[0035] It should be stated that the above-described specific embodiments are merely preferred embodiments of this utility model and the technical principles employed. Those skilled in the art should understand that various modifications, equivalent substitutions, and variations can be made to this utility model. However, such variations, as long as they do not depart from the spirit of this utility model, should be within the protection scope of this utility model. Furthermore, some terminology used in this application specification and claims is not limiting, but merely for ease of description.

Claims

1. A rapid cooling device for sintering NdFeB magnets, comprising an inlet / outlet gas structure and a reflux structure, characterized in that, The gas inlet and outlet structure is installed on the furnace body (13) and furnace cover (14) of the sintering furnace. It includes a first gas inlet main pipe (1), a second gas inlet main pipe (2) and an outlet pipe (3). Each of the two gas inlet main pipes is provided with an inlet and multiple evenly distributed outlets. Each outlet is connected to the furnace body (13) through a pipe. The two gas inlet main pipes are connected to each other through a first valve (4). The inlet of the first gas inlet main pipe (1) is connected to an argon gas supply pipe (5). The inlet of the second gas inlet main pipe (2) is connected to a return pipe (6). The outlet pipe (3) is connected to the furnace cover (14). The outlet pipe (3) is connected to the first exhaust pipe (7) and the connecting pipe (8) through a tee. The reflux structure includes a filter structure (9), a heat exchanger (10), and an air pump (11). The connecting pipe (8) is connected to the inlet of the filter structure (9), the outlet of the filter structure (9) is connected to the tube-side inlet of the heat exchanger (10) through a pipe, the tube-side outlet of the heat exchanger (10) is connected to the input end of the air pump (11) through a pipe, and the output end of the air pump (11) is connected to the reflux pipe (6) and the second exhaust pipe (12) through a tee.

2. The rapid cooling device for sintering NdFeB magnets according to claim 1, characterized in that, The filter structure (9) includes a barrel body (9-1) and a barrel cover (9-2). The inlet of the filter structure (9) is located on the side of the barrel body (9-1) near the bottom. The outlet of the filter structure (9) is located on the barrel cover (9-2). A cup-shaped filter screen (9-3) is fixed inside the barrel body (9-1) near the top opening. An air hammer (9-4) is installed on the outside of the barrel body (9-1). A ash discharge port is provided at the bottom of the barrel body (9-1), and a gate is installed on the ash discharge port. The barrel cover (9-2) is installed at the top opening of the barrel body (9-1) through a flange.

3. The rapid cooling device for sintering NdFeB magnets according to claim 1, characterized in that, The argon gas supply pipe (5) is equipped with a second valve (15) and a first flow meter (16).

4. The rapid cooling device for sintering NdFeB magnets according to claim 1, characterized in that, A third valve (17) and a second flow meter (18) are installed on the return pipe (6).

5. The rapid cooling device for sintering NdFeB magnets according to claim 1, characterized in that, A fourth valve (19) is installed on the first exhaust pipe (7).

6. The rapid cooling device for sintering NdFeB magnets according to claim 1, characterized in that, A fifth valve (20) is installed on the connecting pipe (8).

7. The rapid cooling device for sintering NdFeB magnets according to claim 1, characterized in that, A sixth valve (21) is installed on the second exhaust pipe (12).

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