A strong convection cover type furnace for annealing transformer core silicon steel

Abstract

The utility model discloses a strong convection cover type furnace for transformer core silicon steel annealing, including furnace table, top surface center is provided with fan, inner cover, cover is established on the furnace table, annular board, in the inner cover's inner top wall horizontal setting has a plurality, each annular board is along vertical interval distribution, and the outer diameter of each annular board is sequentially reduced along vertical downward, and each annular board four quarters periphery all curved extension formation drainage portion, and the pad board is set between two adjacent coiled material, and the pad board has the interlayer space that can supply airflow to pass. The utility model forms the passage between each annular board can guide the airflow that spreads horizontally to all around from each position of top even downward flow, make the airflow can reach the end surface of coiled material, then through the interlayer gap of coiled material, promote the evenness of coiled material temperature control, to promote the annealing effect of coiled material, the setting of pad board makes the airflow can pass between the stacked coiled material, further promotes the evenness of coiled material temperature control, promotes the annealing effect of coiled material.

Description

Technical Field

[0001] This utility model belongs to the technical field of bell-type furnaces, and in particular relates to a strong convection bell-type furnace for annealing silicon steel in transformer cores. Background Technology

[0002] Bell-type furnaces are widely used in the metallurgical industry for annealing steel wire, steel pipe, copper strip, copper wire, and silicon steel sheets. Among them, copper strip is mainly suitable for heat treatment of materials such as brass strip, bronze strip, shaped copper strip, and red copper strip.

[0003] Patent CN204356365U discloses a high-convection all-hydrogen bell-type furnace. Inside this furnace, the airflow flows upward from the center to the top and then diffuses outwards, before flowing downwards along the inner walls of the inner shroud to the bottom, thus achieving circulation. However, for coils placed inside the bell-type furnace, this circulation method means the airflow can only circulate around the outer perimeter of the coil and cannot cover the gaps between the coil layers, thereby affecting the annealing effect on the coil.

[0004] Therefore, it is necessary to improve the existing bell-type furnace. Utility Model Content

[0005] The purpose of this invention is to overcome the defects in the existing technology and provide a strong convection bell-type furnace for annealing silicon steel in transformer cores, thereby improving the annealing effect of coils in the bell-type furnace.

[0006] To achieve the above objectives, the specific technical solution of the high-convection hood furnace for annealing silicon steel transformer cores of this utility model is as follows: A high-convection hood furnace for annealing silicon steel transformer cores, comprising: The furnace platform has a fan installed at the center of its top surface and is used for stacking and placing rolled materials. An inner cover is placed over the furnace platform and encloses the furnace platform to form an annealing chamber. Multiple annular plates are horizontally arranged on the inner top wall of the inner cover. Each annular plate is distributed vertically at intervals. The outer diameter of each annular plate decreases sequentially downwards vertically. The outer edges of each annular plate are bent downwards to form a drainage section. An annular pad is placed between two adjacent rolls of material, the pad having an interlayer space through which airflow can pass.

[0007] Preferably, the annular plate and the drainage portion are connected by an arc transition.

[0008] Preferably, the annular plates are distributed at equal intervals along the vertical direction, with the uppermost annular plate spaced apart from the inner wall of the furnace platform.

[0009] Preferably, the inner top wall of the furnace platform is provided with a conical guide block, and the guide block is coaxially arranged with each of the annular plates.

[0010] Preferably, the furnace platform is a columnar structure, and the top surface of the furnace platform has multiple reflux grooves along its radial direction.

[0011] Preferably, the pad includes a top plate and a bottom plate that are parallel to each other, and the top plate and the bottom plate are fixedly connected to each other by a fixing ring, the fixing ring having a notch.

[0012] Preferably, multiple fixing rings are provided, each fixing ring is a concentric ring, and each fixing ring has a notch.

[0013] Preferably, the notches are evenly distributed circumferentially on the fixing ring, and the notches on adjacent fixing rings are staggered.

[0014] Preferably, the base plate has a plurality of ventilation holes evenly distributed thereon.

[0015] Preferably, the top surface of the top plate has multiple guide grooves along its radial direction.

[0016] The high-convection bell-type furnace for annealing silicon steel transformer cores of this utility model has the following advantages: the channels formed between each annular plate can guide the horizontally diffused airflow to flow evenly downwards from various positions on the top, allowing the airflow to reach the end face of the coil and then pass through the interlayer gaps of the coil, thereby improving the uniformity of temperature control of the coil and thus improving the annealing effect of the coil; the setting of the pad plate allows the airflow to pass through the stacked coils, further improving the uniformity of temperature control of the coil and improving the annealing effect of the coil. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the bell-type furnace of this utility model; Figure 2 This is a cross-sectional view of the bell-type furnace of this utility model; Figure 3 This is a schematic diagram of the exploded structure of the bell-type furnace of this utility model; Figure 4 This is a schematic diagram of the structure of the furnace platform of this utility model; Figure 5 This is a schematic diagram of the structure of the inner cover of this utility model; Figure 6 This is a schematic diagram of the structure of the pad of this utility model; Figure 7 This is a cross-sectional view of the pad of this utility model; The markings in the diagram are as follows: 1. Furnace platform; 2. Inner cover; 3. Pad plate; 4. Roll material; 101. Fan; 102. Return channel; 201. Guide block; 202. Annular plate; 203. Drainage section; 301. Bottom plate; 302. Top plate; 303. Guide channel; 304. Vent hole; 305. Fixing ring; 306. Notch. Detailed Implementation

[0018] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0019] The terms "top surface," "bottom surface," and "full surface" are used with reference to the normal operating state of the bell-type furnace and are only for the convenience of describing this utility model and simplifying the description. They are not intended to indicate or imply that the device or component 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 utility model.

[0020] like Figure 1-4 As shown, a high-convection hood furnace for annealing silicon steel transformer cores includes: Furnace platform 1, with a fan 101 installed at the center of its top surface, is used to stack and place rolls 4; Inner cover 2 is placed on furnace platform 1 and encloses furnace platform 1 to form annealing chamber; Multiple annular plates 202 are horizontally arranged on the inner top wall of the inner cover 2. Each annular plate 202 is distributed vertically at intervals. The outer diameter of each annular plate 202 decreases vertically downwards. The outer edges of each annular plate 202 are bent downwards to form a drainage part 203. An annular pad 3 is placed between two adjacent rolls 4, and the pad 3 has an interlayer space through which airflow can pass.

[0021] The aforementioned bell-type furnace is suitable for annealing metal coils. A heating hood is also required to cover the inner hood 2. In use, the heating hood and the inner hood 2 are opened in sequence, and the coil 4 is stacked vertically on the top surface of the furnace platform 1. A pad 3 is placed between two adjacent coils 4. When stacking, the holes in the center of the coil 4 and the pad 3 need to be aligned vertically. Then, the inner hood 2 and the heating hood are covered in sequence. When the bell-type furnace is working, the blower 101 delivers airflow from the bottom to the top. When the airflow reaches the top of the inner hood 2, it spreads to the surroundings and then flows down along the inner wall of the inner hood 2 to achieve circulation. The airflow can make the temperature inside the bell-type furnace uniform and can remove residual moisture on the coil to improve the annealing effect on the coil 4.

[0022] Compared to existing bell-type furnaces, this bell-type furnace has an annular plate 202 at the top of the inner shroud 2. The gaps between the annular plates 202 form channels that guide the airflow direction. The inlets of each channel are annular and face horizontally, and the inlets of each channel are arranged vertically. The outlets of each channel are concentric annular rings facing downwards. In this way, the outlets of each channel can evenly cover the top part of the inner shroud 2 except for the central opening of the annular plate 202. The airflow inside the inner shroud 2 enters the central opening of the annular plate 202 through the central opening of each roll 4, and then diffuses horizontally to the surrounding area, thus entering the inlets of each channel. After that, the airflow is guided by the channels. The airflow flows downwards along the outlets of each channel. Through the guiding effect of the annular plate 202, the downward-flowing airflow can cover the area on the top surface of the inner cover 2 except for the central opening of the annular plate 202. This allows the downward airflow to flow through the outer periphery and end face of the roll 4, and allows the airflow to enter the gaps between the layers of the roll 4. This results in a uniform heat distribution on the roll 4 and can remove moisture from the surface and interlayer of the roll 4, improving the annealing effect of the bell furnace. Furthermore, the pad 3 set between the upper and lower rolls 4 allows the airflow to diffuse from the inside to the outside between the abutting end faces of the upper and lower rolls 4, thereby further improving the heating uniformity of the roll 4 and enhancing the annealing effect of the bell furnace.

[0023] Further improvements include, for example Figure 5 As shown, the annular plate 202 and the flow guide 203 are connected by an arc transition. The arc transition makes the corners of the channel between the annular plates 202 smoother, reducing resistance to airflow and allowing airflow to pass more smoothly. This, in turn, improves the speed and effect of airflow circulation, enhances the uniformity of temperature inside the bell-shaped furnace, and improves its annealing effect.

[0024] Further improvements include, for example Figure 5 As shown, the annular plates 202 are distributed at equal intervals along the vertical direction, with the uppermost annular plate 202 spaced apart from the inner wall of the furnace platform 1. The equally spaced annular plates 202 ensure consistent air inlet openings in the channels formed between them, thereby reducing the difference in airflow entering each channel and making the exhaust volume at the outlet of each channel more uniform. This, in turn, improves the uniformity of airflow circulation within the inner cover 2 and enhances the heating uniformity of the bell-type furnace. The channels formed between the annular plates 202 and the inner wall of the inner cover 2 also allow airflow, enabling some airflow to circulate along the inner wall of the inner cover 2. This portion of airflow flows along the outer periphery of the coil 4, experiencing less resistance from the coil 4, which better promotes large-scale airflow circulation within the inner cover 2, further improving the heating uniformity of the bell-type furnace and enhancing the annealing effect.

[0025] Further improvements include, for example Figure 5As shown, the inner top wall of the furnace platform 1 is provided with a conical guide block 201, which is coaxially arranged with each annular plate 202. The guide block 201 can guide the airflow reaching the top of the inner cover 2 to diffuse horizontally, making the airflow turn more smoothly, so as to ensure the stability of the airflow speed, improve the speed and uniformity of heat conduction inside the bell furnace, and improve the annealing effect of the bell furnace.

[0026] Further improvements include, for example Figure 4 As shown, the furnace platform 1 is a columnar structure, and multiple return grooves 102 are formed radially on the top surface of the furnace platform 1. The airflow from the top to the bottom of the inner cover 2 can flow from the outside to the inside of the coil 4 through the return grooves, thereby realizing the up-and-down circulation of airflow inside the inner cover 2, improving the heat diffusion effect inside the bell-shaped furnace, and thus improving the annealing effect of the bell-shaped furnace.

[0027] Further improvements include, for example Figure 6 and 7 As shown, the pad 3 includes a top plate 302 and a bottom plate 301 that are parallel to each other. The top plate 302 and the bottom plate 301 are fixedly connected to each other by a fixing ring 305, which has a notch 306. The fixing ring 305 is used to fix the top plate 302 and the bottom plate 301 and to form a hollow interlayer channel between them that allows airflow. This allows airflow to circulate between the upper and lower rolls 4, improving the heat conduction effect. The notch 306 reduces the resistance of the fixing ring 305 to the airflow, making the airflow between the top plate 302 and the bottom plate 301 smoother and improving the heat conduction effect.

[0028] Further improvements include, for example Figure 6 and 7 As shown, multiple fixing rings 305 are provided, each fixing ring 305 is a concentric ring, and each fixing ring 305 has a notch 306. The arrangement of multiple fixing rings 305 can improve the overall strength of the pad 3, and the fixing rings 305 can also act as heat exchange fins, improving the heat exchange efficiency between the airflow and the pad 3, thereby improving the heating effect on the abutting end faces of the upper and lower rolls 4, so that the heat is evenly distributed on the rolls 4.

[0029] Further improvements include, for example Figure 6 and 7 As shown, the notches 306 are evenly distributed around the circumference of the fixing rings 305, and the notches 306 on adjacent fixing rings 305 are staggered. The staggered notches 306 can extend the distance that the airflow travels between the top plate 302 and the bottom plate 301, thereby improving the heat exchange effect and further improving the uniformity of heating the roll material 4.

[0030] Further improvements include, for example Figure 6 and 7As shown, multiple ventilation holes 304 are evenly distributed on the base plate 301. Airflow can evenly enter the interlayer gaps of the coil 4 located below through the ventilation holes 304, so that airflow can pass through the interlayer gaps of each stacked coil 4, thereby improving the heating uniformity of each coil 4 and improving the annealing effect of the bell furnace.

[0031] Further improvements include, for example Figure 6 and 7 As shown, the top surface of the top plate 302 has multiple guide grooves 303 along its radial direction. The airflow between the layers of the roll 4 above the pad plate 3 can flow through the guide grooves 303 to the outside of the roll 4 and mix into the large circulating airflow inside the inner cover 2, thereby improving the heating effect on each roll 4 and improving the annealing effect of the bell furnace.

[0032] The inner shroud 2 of the bell-type furnace has a large circulating airflow that flows upward from the center opening of the coil 4 and flows downward along the inner wall of the inner shroud 2. The large circulating airflow can ensure that the heat is uniform throughout the entire space inside the inner shroud 2. At the same time, there is also airflow passing between the stacked upper and lower coils, and airflow flowing from above the individual coil 4 through the gaps between the layers of the coil 4 to the bottom, so that the heat is evenly distributed on the outer surface and between the layers of the individual coil. The strong convection formed by the above three airflows can improve the annealing effect of the bell-type furnace.

[0033] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A high-convection hood-type furnace for annealing silicon steel transformer cores, characterized in that, include: The furnace platform has a fan installed at the center of its top surface and is used for stacking and placing rolled materials. An inner cover is placed over the furnace platform and encloses the furnace platform to form an annealing chamber. Multiple annular plates are horizontally arranged on the inner top wall of the inner cover. Each annular plate is distributed vertically at intervals. The outer diameter of each annular plate decreases sequentially downwards vertically. The outer edges of each annular plate are bent downwards to form a drainage section. An annular pad is placed between two adjacent rolls of material, the pad having an interlayer space through which airflow can pass.

2. The high-convection hood furnace for annealing silicon steel transformer cores according to claim 1, characterized in that, The annular plate and the drainage section are connected by an arc transition.

3. The high-convection hood furnace for annealing silicon steel transformer cores according to claim 1, characterized in that, The annular plates are distributed at equal intervals along the vertical direction, with the uppermost annular plate spaced apart from the inner wall of the furnace platform.

4. The high-convection hood furnace for annealing silicon steel transformer cores according to claim 1, characterized in that, The inner top wall of the furnace platform is provided with a conical guide block, and the guide block is coaxially arranged with each of the annular plates.

5. The high-convection hood furnace for annealing silicon steel transformer cores according to claim 1, characterized in that, The furnace platform is a columnar structure, and multiple reflux grooves are formed on the top surface of the furnace platform along its radial direction.

6. The high-convection hood furnace for annealing silicon steel transformer cores according to claim 1, characterized in that, The pad includes a top plate and a bottom plate that are parallel to each other. The top plate and the bottom plate are fixedly connected to each other by a fixing ring, and the fixing ring has a notch.

7. The high-convection hood furnace for annealing silicon steel transformer cores according to claim 6, characterized in that, The fixing rings are provided in multiple ways, each of which is a concentric ring and each of which has a notch.

8. The high-convection hood furnace for annealing silicon steel transformer cores according to claim 7, characterized in that, The notches are evenly distributed around the circumference of the fixed ring, and the notches on adjacent fixed rings are staggered.

9. The high-convection hood furnace for annealing silicon steel transformer cores according to claim 8, characterized in that, The base plate has multiple ventilation holes evenly distributed.

10. The high-convection hood furnace for annealing silicon steel transformer cores according to claim 8, characterized in that, The top surface of the top plate has multiple guide grooves along its radial direction.

Images