A structure for rapid air cooling after heat treatment of sintered neodymium-iron-boron

Abstract

This utility model discloses a structure for rapid air cooling of sintered NdFeB after heat treatment, belonging to the field of NdFeB cooling technology. It includes a furnace body, a cooling chamber within the furnace body, and an annular air duct surrounding the cooling chamber. The first end of the annular air duct is connected to a blower. Multiple air inlet pipe groups are arranged side-by-side along the furnace body axis. Each air inlet pipe group includes multiple air inlets arranged circumferentially around the furnace body axis. The annular air duct communicates with the cooling chamber through the air inlets. An annular baffle is slidably installed within the annular air duct. An elastic element is fixedly connected between the annular baffle and the inner wall of the second section of the annular air duct. A valve cylinder is fixedly connected to the end of the annular baffle away from the elastic element. The valve cylinder has multiple valve holes corresponding one-to-one with the air inlets. This utility model ensures that the airflow from each air inlet pipe to the cooling chamber is consistent during the initial air intake process by opening or closing all air inlets through the sliding valve cylinder, thus improving the cooling uniformity of the NdFeB.

Description

Technical Field

[0001] This utility model belongs to the field of NdFeB cooling technology, specifically relating to a structure for rapid air cooling of sintered NdFeB after heat treatment. Background Technology

[0002] Horizontal vacuum sintering furnaces are widely used in the heat treatment process of sintered NdFeB. Cooling is one of the important processes in the heat treatment process. Sintered NdFeB generally needs to undergo high-temperature sintering and cooling, plus multi-stage tempering and air cooling. The cooling rate of the material will have a significant impact on the magnetic properties.

[0003] Existing technologies, such as Chinese Patent Publication No. CN206774389U, disclose a sintering device for sintering NdFeB magnets. By changing the blowing direction of the air inlet pipe, a gas transition zone is directly formed between the cooling gas and the product, reducing the temperature difference between the cooling gas and the product and effectively preventing the product from cracking due to a large temperature difference. However, because it has multiple air inlet pipes along the furnace axis, during the initial air intake process, the air inlet pipe at the front end of the air inlet will inject cooling gas first. This results in uneven air intake at the front and rear of the furnace during the initial cooling stage, thus affecting the cooling effect.

[0004] Therefore, it is necessary to propose a structure for rapid air cooling after heat treatment of sintered NdFeB to solve the above problems. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a structure for rapid air cooling after heat treatment of sintered NdFeB, in order to solve the problem in the prior art that the air intake volume of the air intake pipes before and after the furnace body is uneven during the initial air intake process, thereby affecting the cooling effect.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model provides a structure for rapid air cooling after heat treatment of sintered NdFeB iron boron iron oxide, including a furnace body. The furnace body is provided with a cooling chamber and an annular air duct surrounding the cooling chamber. The first end of the annular air duct is connected to a blower for injecting cooling air into the annular air duct. Multiple air inlet pipe groups are arranged side by side along the furnace body axis. Each air inlet pipe group includes multiple air inlet pipes arranged circumferentially with the furnace body axis as the center. The annular air duct is connected to the cooling chamber through the air inlet pipes. An annular baffle is slidably arranged inside the annular air duct. An elastic element is fixedly connected between the annular baffle and the inner wall of the second section of the annular air duct. A valve cylinder is fixedly connected to the end of the annular baffle away from the elastic element. The valve cylinder is provided with multiple valve holes corresponding one-to-one with the air inlet pipes. Sliding the valve cylinder can open or close all air inlet pipes.

[0008] Furthermore, an annular groove surrounding the cooling chamber is provided in the annular air duct near the cooling chamber side, and the valve cylinder is slidably disposed in the annular groove, with the outer wall of the valve cylinder and the inner wall of the annular air duct located on the same circumferential surface.

[0009] Furthermore, a limiting ring is fixedly connected inside the annular air duct, and the outer wall of the valve cylinder away from the annular baffle is slidably connected to the inner wall of the limiting ring.

[0010] Furthermore, the axial direction of the air inlet pipe extends radially along the furnace body, the end of the air inlet pipe extending to the cooling chamber is closed, and an air outlet is radially provided on the outer peripheral wall of the air inlet pipe.

[0011] Furthermore, the air outlet is arranged along the shear direction of the circumference of the cooling chamber.

[0012] Furthermore, the elastic element is a spring.

[0013] Furthermore, the valve cylinder is threadedly connected to the annular baffle.

[0014] The beneficial effects of this invention are as follows: by opening or closing all air intake pipes through the sliding valve cylinder, the air volume input to the cooling chamber from each air intake pipe is consistent during the initial air intake process, thereby improving the uniformity of cooling of NdFeB.

[0015] Other advantages, objectives, and features of this invention will be set forth in the following description and will be apparent to those skilled in the art to some extent, or may be learned by practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0016] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration:

[0017] Figure 1 This is a cross-sectional view of the furnace body structure according to an embodiment of the present utility model;

[0018] Figure 2 This is an embodiment of the present utility model. Figure 1 A magnified view of part A in the middle.

[0019] The following are the markings in the attached diagram: furnace body 1, cooling chamber 101, annular air duct 102, air inlet pipe 103, annular groove 104, air outlet 105, limiting ring 106, annular baffle 2, elastic element 201, valve cylinder 202, valve hole 203. Detailed Implementation

[0020] like Figures 1-2As shown, this utility model provides a structure for rapid air cooling after heat treatment of sintered NdFeB, comprising: a furnace body 1, wherein a cooling chamber 101 and an annular air duct 102 are arranged around the cooling chamber 101, the first end of the annular air duct 102 is connected to a blower for injecting cooling air into the annular air duct 102, the blower being a conventional technique in the art and will not be described in detail here; multiple air inlet pipe groups are arranged side by side along the axial direction of the furnace body 1, each air inlet pipe group including multiple circumferentially arranged around the axial direction of the furnace body 1. An air intake pipe 103 is provided, and the annular air duct 102 is connected to the cooling chamber 101 through the air intake pipe 103. An annular baffle 2 is slidably arranged inside the annular air duct 102. An elastic element 201, which is a spring, is fixedly connected between the annular baffle 2 and the inner wall of the second end of the annular air duct 102. The end of the annular baffle 2 away from the elastic element 201 is fixedly connected to a valve cylinder 202. The valve cylinder 202 is provided with a plurality of valve holes 203 that correspond one-to-one with the air intake pipe 103. Sliding the valve cylinder 202 can open or close all the air intake pipes 103.

[0021] In this scheme, before cooling, the valve cylinder 202 is set to close the air inlet pipe 103 under the action of the elastic element 201. When cooling the NdFeB, cooling air is injected into the cooling chamber 101 through the blower. The cooling air first passes through the annular air duct 102. After the annular air duct 102 is filled, the cooling air continues to be injected, causing the annular baffle 2 to move and drive the elastic element 201 to compress, thereby driving the valve cylinder 202 to move to open all the air inlet pipes 103. At this time, the cooling air in the annular air duct 102 flows into the cooling chamber 101 from the air inlet pipe 103 to cool the NdFeB, thereby ensuring that the air volume input from each air inlet pipe 103 to the cooling chamber 101 is consistent during the initial air intake process, and improving the cooling uniformity of the NdFeB.

[0022] In one embodiment of the present invention, an annular groove 104 is provided in the annular air duct 102 near the cooling chamber 101, and the valve cylinder 202 is slidably disposed in the annular groove 104. The outer wall of the valve cylinder 202 and the inner wall of the annular air duct 102 are located on the same circumferential surface.

[0023] In this solution, by setting an annular groove 104, the outer wall of the valve cylinder 202 and the inner wall of the annular air duct 102 are located on the same circumferential surface, so as to prevent the cooling air from flowing in from between the valve cylinder 202 and the inner wall of the annular air duct 102 when the cooling air is injected.

[0024] In one embodiment of the present invention, a limiting ring 106 is fixedly connected inside the annular air duct 102, and the outer wall of the valve cylinder 202 away from the annular baffle 2 is slidably connected to the inner wall of the limiting ring 106.

[0025] In this solution, a limit ring 106 is set to ensure the sliding stability of the valve cylinder 202 and prevent the valve cylinder 202 from warping.

[0026] In one embodiment of the present invention, the axial direction of the air inlet pipe 103 extends radially along the furnace body 1, and the end of the air inlet pipe 103 extending to the cooling chamber 101 is closed. An air outlet 105 is radially provided on the outer peripheral wall of the air inlet pipe 103.

[0027] In this design, the air outlet 105 is radially positioned to prevent the cooling air from blowing directly onto the NdFeB product, thus preventing the product from cracking due to a large temperature difference. Furthermore, the air outlet 105 is positioned directly opposite the inner wall of the cooling chamber 101, and the cooling air blown out from the air outlet 105 collides with the inner wall of the cooling chamber 101 to form turbulence, thereby improving the cooling effect.

[0028] In one embodiment of this utility model, the air outlet 105 is arranged along the shear direction of the circumference of the cooling chamber 101.

[0029] In this design, the outlet air 105 of each intake pipe 103 in the intake pipe group is arranged in a circumferential direction, so that the outlet air direction is set around the NdFeB product, thereby improving the cooling effect on the NdFeB product.

[0030] In one embodiment of this utility model, the valve cylinder 202 is threadedly connected to the annular baffle 2.

[0031] In this design, the valve cylinder 202 and the annular baffle 2 are detachable via a threaded internal connection, facilitating replacement.

[0032] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A structure for rapid air cooling after heat treatment of sintered NdFeB iron boron iron, comprising a furnace body, characterized in that: The furnace body is provided with a cooling chamber and an annular air duct surrounding the cooling chamber. The first end of the annular air duct is connected to a blower for injecting cooling air into the annular air duct. Multiple air inlet pipe groups are arranged side by side along the furnace body axis. Each air inlet pipe group includes multiple air inlet pipes arranged circumferentially with the furnace body axis as the center. The annular air duct is connected to the cooling chamber through the air inlet pipes. An annular baffle is slidably arranged inside the annular air duct. An elastic element is fixedly connected between the annular baffle and the inner wall of the second section of the annular air duct. A valve cylinder is fixedly connected to the end of the annular baffle away from the elastic element. The valve cylinder is provided with multiple valve holes corresponding one-to-one with the air inlet pipes. Sliding the valve cylinder can open or close all air inlet pipes.

2. The structure for rapid air cooling of sintered NdFeB after heat treatment according to claim 1, characterized in that: An annular groove surrounding the cooling chamber is provided in the annular air duct near the cooling chamber side. The valve cylinder is slidably disposed in the annular groove, and the outer wall of the valve cylinder and the inner wall of the annular air duct are located on the same circumferential surface.

3. The structure for rapid air cooling of sintered NdFeB after heat treatment according to claim 2, characterized in that: A limiting ring is fixedly connected inside the annular air duct, and the outer wall of the valve cylinder away from the annular baffle is slidably connected to the inner wall of the limiting ring.

4. The structure for rapid air cooling of sintered NdFeB after heat treatment according to claim 3, characterized in that: The air inlet pipe extends radially along the furnace body along its axial direction. The end of the air inlet pipe extending to the cooling chamber is closed. An air outlet is radially provided on the outer peripheral wall of the air inlet pipe.

5. The structure for rapid air cooling of sintered NdFeB after heat treatment according to claim 4, characterized in that: The air outlet is arranged along the shear direction of the circumference of the cooling chamber.

6. The structure for rapid air cooling of sintered NdFeB after heat treatment according to claim 1, characterized in that: The elastic element is a spring.

7. The structure for rapid air cooling of sintered NdFeB after heat treatment according to claim 1, characterized in that: The valve cylinder is threadedly connected to the annular baffle.

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