A vacuum drying furnace body

Abstract

This utility model discloses a vacuum drying furnace body, belonging to the technical field of drying equipment. The vacuum drying furnace body includes a furnace body and reinforcing ribs. The furnace body has a vacuum cavity. The outer wall surface of the furnace body has a protrusion that protrudes from the inside to the outside. The protrusion forms a groove on the inner wall surface of the furnace body that communicates with the vacuum cavity. Multiple reinforcing ribs are connected to the outer wall surface of the furnace body, and at least one reinforcing rib is arranged at an angle to the protrusion and is fixedly connected. This is beneficial for reducing material costs and the number of welds, simplifying the manufacturing process, and improving production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of drying equipment technology, and in particular to a vacuum drying furnace body. Background Technology

[0002] The vacuum furnace body is the core component of industrial vacuum baking equipment, and its performance directly determines the precision, reliability, and ultimate capacity of the entire equipment. To maintain a high vacuum, the furnace wall must have sufficient strength and rigidity to resist the stress and strain caused by atmospheric pressure. Insufficient strength will cause the furnace body to break, while insufficient rigidity will cause excessive deformation of the furnace body, affecting the sealing and vacuum level.

[0003] In related technologies, the outer wall of the vacuum furnace body is welded with staggered transverse and longitudinal reinforcing ribs to meet the strength and rigidity requirements of the vacuum furnace body. However, since the transverse reinforcing ribs need to be welded to the outer wall of the furnace body, the longitudinal reinforcing ribs need to be welded to the outer wall of the furnace body, and the transverse and longitudinal reinforcing ribs also need to be welded, a large number of weld points are generated, the welding process becomes more difficult, and the risk of incomplete welds, false welds, and missing welds also increases accordingly. Utility Model Content

[0004] This invention aims to at least solve the technical problems existing in related technologies. To this end, this invention proposes a vacuum drying furnace body, which helps reduce material costs and the number of welds, simplifies the manufacturing process, and improves production efficiency.

[0005] The vacuum drying furnace body of this utility model embodiment includes: a furnace body having a vacuum cavity, the outer wall surface of the furnace body having a protrusion protruding from the inside out, the protrusion forming a groove communicating with the vacuum cavity on the inner wall surface of the furnace body, the protrusion being integrally formed and connected to the furnace body; and reinforcing ribs, multiple reinforcing ribs being connected to the outer wall surface of the furnace body, and at least one reinforcing rib being arranged at an angle to the protrusion and fixedly connected.

[0006] According to the embodiments of the present invention, the vacuum drying furnace body has at least the following beneficial effects: the outer wall surface of the furnace body has a protrusion that protrudes from the inside out, and the protrusion forms a groove communicating with the vacuum cavity on the inner wall surface of the furnace body. The wall of the furnace body protrudes from the inside out, thereby forming the protrusion. The protrusion can be part of the furnace body. The vacuum drying furnace body is provided with multiple reinforcing ribs, all of which are connected to the outer wall surface of the furnace body. At least one reinforcing rib is arranged at an angle to the protrusion and is fixedly connected to it, so as to improve the compressive and bending stiffness of the vacuum drying furnace body and improve the reliability of the vacuum drying furnace body. The protrusion of the vacuum drying furnace body can be formed by an integral molding process, which can effectively reduce the number of welds, simplify the manufacturing process, save the cost of welded pipes, and improve the production efficiency of the vacuum drying furnace body.

[0007] According to some embodiments of the present invention, the protrusion includes a plurality of straight protrusions.

[0008] According to some embodiments of the present invention, the protrusion includes a left protruding strip disposed on the left wall of the furnace body; And / or, the protrusion includes a right protrusion strip provided on the right wall of the furnace body; And / or, the protrusion includes an upper protrusion strip provided on the upper wall of the furnace body; And / or, the protrusion includes a lower protrusion strip provided on the lower wall of the furnace body; And / or, the protrusion includes a rear protrusion strip provided on the rear wall of the furnace body.

[0009] According to some embodiments of this utility model, the vacuum cavity is arranged to be open to the front, and the protrusion includes a left protrusion on the left wall of the furnace body, a right protrusion on the right wall of the furnace body, an upper protrusion on the upper wall of the furnace body, and a lower protrusion on the lower wall of the furnace body. The length direction of the left protrusion, right protrusion, upper protrusion and lower protrusion is the front-back direction.

[0010] According to some embodiments of the present invention, the plurality of reinforcing ribs include a first reinforcing rib, which is arranged around the furnace body in a front-back direction and connected to the furnace body. The left convex strip, the lower convex strip, the right convex strip and the upper convex strip are all arranged at an angle to the first reinforcing rib and are fixedly connected.

[0011] According to some embodiments of the present invention, the protrusion includes a left protruding strip on the left wall of the furnace body, a rear protruding strip on the rear wall of the furnace body, and a right protruding strip on the right wall of the furnace body. The length direction of the rear protruding strip is the left-right direction, and the length directions of the left and right protruding strips are both the front-back direction.

[0012] According to some embodiments of the present invention, the plurality of reinforcing ribs include a second reinforcing rib, which is arranged around the furnace body in the vertical direction and connected to the furnace body.

[0013] According to some embodiments of the present invention, the protrusion includes an upper protrusion strip on the upper wall of the furnace body, a rear protrusion strip on the rear wall of the furnace body, and a lower protrusion strip on the lower wall of the furnace body. The length direction of the rear protrusion strip is the left-right direction, and the length directions of the upper and lower protrusion strips are both the front-back direction.

[0014] According to some embodiments of the present invention, the plurality of reinforcing ribs include a third reinforcing rib, which is arranged around the furnace body in the left-right direction and connected to the furnace body. The rear protrusion is arranged at an angle to the third reinforcing rib and is fixedly connected.

[0015] According to some embodiments of the present invention, the protrusion includes a left protruding strip on the left wall of the furnace body, a right protruding strip on the right wall of the furnace body, an upper protruding strip on the upper wall of the furnace body, a lower protruding strip on the lower wall of the furnace body, and a rear protruding strip on the rear wall of the furnace body. The left protruding strip, right protruding strip, upper protruding strip, lower protruding strip and rear protruding strip have the same geometric feature parameters. And / or, the reinforcing rib connected to the protrusion is provided with a first groove, the first groove fitting into the protrusion.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a three-dimensional structural diagram of a vacuum drying furnace body according to an embodiment of the present invention; Figure 2 This is a front view of a vacuum drying furnace body according to an embodiment of the present invention; Figure 3 This is a right view of a vacuum drying furnace body according to an embodiment of the present invention; Figure 4 This is a left view of a vacuum drying furnace body according to an embodiment of the present invention; Figure 5 This is a top view of a vacuum drying furnace body according to an embodiment of the present invention; Figure 6 This is a bottom view of a vacuum drying furnace body according to an embodiment of the present invention; Figure 7 This is a rear view of a vacuum drying furnace body according to an embodiment of the present invention.

[0018] Icon labels: 100. Furnace body; 110. Vacuum chamber; 120. Right wall; 130. Lower wall; 140. Left wall; 150. Upper wall; 160. Rear wall; 210. Right convex strip; 220. Lower convex strip; 230. Left convex strip; 240. Upper convex strip; 250. Rear convex strip; 310. First reinforcing rib; 320. Second reinforcing rib; 330. Third reinforcing rib. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are 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, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0022] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0023] Reference Figures 1 to 7 As shown, a vacuum drying furnace body according to an embodiment of the present invention includes: furnace body 100 and reinforcing ribs.

[0024] Reference Figure 1 , Figure 2 and Figure 3 As shown, the furnace body 100 has a vacuum chamber 110. This vacuum drying furnace body can be used for drying lithium batteries. The lithium batteries can be placed inside the vacuum chamber 110. With the help of external vacuum pumping device and heating device, the vacuum chamber 110 is vacuumed and heated to achieve the drying of the lithium batteries.

[0025] Reference Figure 1 , Figure 2 and Figure 3 As shown, the outer wall of the furnace body 100 has a protrusion that bulges outward from the inside. This protrusion forms a groove on the inner wall of the furnace body 100 that communicates with the vacuum chamber 110. The protrusion is integrally connected to the furnace body 100, and the wall of the furnace body 100 protrudes outward from the inside, thus forming the protrusion, which is part of the furnace body 100. During production, the manufacturer can use a stamping process to stamp the protrusion on the wall of the furnace body 100, greatly improving its compressive and bending stiffness.

[0026] Reference Figure 1 , Figure 2 and Figure 3 As shown, multiple reinforcing ribs are provided, and all of the reinforcing ribs are connected to the outer wall of the furnace body 100. At least one reinforcing rib is arranged at an angle to the protrusion and is fixedly connected to it, so as to further improve the compressive and bending stiffness of the vacuum drying furnace body and improve the reliability of the vacuum drying furnace body.

[0027] Reference Figure 1 , Figure 2 and Figure 3 As shown, compared to the structure that welds transverse and longitudinal reinforcing ribs to the surface of the furnace body 100, the vacuum drying furnace body provided in this embodiment can be formed by stamping and integral molding of the protrusion, which can effectively reduce the number of welds and save the cost of welding pipes. Through the combination of the protrusion and the reinforcing rib, the preset strength and rigidity are achieved, which can effectively simplify the manufacturing process, improve the reliability of the cavity and the consistency of production, facilitate mass production and improve the production efficiency of the vacuum drying furnace body.

[0028] Reference Figure 1 , Figure 2 and Figure 3 As shown, specifically, compared to the structure of welding transverse and longitudinal reinforcing ribs to the surface of the furnace body 100, this vacuum drying furnace body, through structural optimization, can save about 35% of welding pipes and welding time while meeting the requirements of strength and rigidity, thus having better economic efficiency.

[0029] Reference Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, it can be understood that, specifically, the vacuum chamber 110 of the furnace body 100 is open to the front, and the protrusions include a left protrusion 230 on the left wall 140 of the furnace body 100, a right protrusion 210 on the right wall 120 of the furnace body 100, an upper protrusion 240 on the upper wall 150 of the furnace body 100, a lower protrusion 220 on the lower wall 130 of the furnace body 100, and a rear protrusion 250 on the rear wall 160 of the furnace body 100.

[0030] Reference Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, specifically, the left convex strip 230, right convex strip 210, upper convex strip 240, lower convex strip 220, and rear convex strip 250 are all straight convex strips, which can reduce the difficulty of processing and forming the convex parts. The left convex strip 230, right convex strip 210, upper convex strip 240, lower convex strip 220, and rear convex strip 250 respectively form strip-shaped grooves on the inner wall surface of the furnace body 100 that communicate with the vacuum cavity 110.

[0031] Reference Figure 1 , Figure 3 and Figure 4 As shown, specifically, the left protrusion 230, right protrusion 210, upper protrusion 240, lower protrusion 220 and rear protrusion 250 all have a tapering section that gradually narrows from the inside to the outside, so as to facilitate the ejection of the die after the stamping head is stamped, which can reduce the processing and forming difficulty of the protrusion and reduce the risk of damage to the edge of the protrusion.

[0032] Reference Figure 1 , Figure 3 and Figure 4 As shown, specifically, the length directions of the left convex strip 230, right convex strip 210, lower convex strip 220 and upper convex strip 240 are all arranged along the front-to-back direction, while the length direction of the rear convex strip 250 is arranged along the left-to-right direction.

[0033] Reference Figure 1 , Figure 3 and Figure 4 As shown, it is understandable that, specifically, the length directions of the left convex strip 230, right convex strip 210, upper convex strip 240, and lower convex strip 220 are all in the front-back direction, that is, the length directions of the left convex strip 230, right convex strip 210, lower convex strip 220, and upper convex strip 240 are consistent, which can further improve the processing efficiency of the left convex strip 230, right convex strip 210, upper convex strip 240, and lower convex strip 220.

[0034] Reference Figure 1 , Figure 3 and Figure 4 As shown, the multiple reinforcing ribs include a first reinforcing rib 310, which is arranged around the furnace body 100 in the front-back direction and connected to the furnace body 100. The first reinforcing rib 310 includes a first rib, a second rib, a third rib, and a fourth rib connected in sequence. The first rib, the second rib, the third rib, and the fourth rib are respectively connected to the left wall 140, the lower wall 130, the right wall 120, and the upper wall 150 of the furnace body 100.

[0035] Reference Figure 1 , Figure 5 and Figure 6 As shown, specifically, the first and third ribs extend vertically, and the second and fourth ribs extend horizontally, such that the left convex rib 230, the lower convex rib 220, the right convex rib 210, and the upper convex rib 240 are all arranged at right angles to the first reinforcing rib 310. That is, the first rib is welded to the left convex rib 230, the second rib is welded to the lower convex rib 220, the third rib is welded to the right convex rib 210, and the fourth rib is welded to the upper convex rib 240, thereby achieving the welding and fixing of the left convex rib 230, the lower convex rib 220, the right convex rib 210, and the upper convex rib 240 to the first reinforcing rib 310.

[0036] Reference Figure 1 , Figure 5 and Figure 6 As shown, it should be noted that the first reinforcing rib 310 can be formed into the first rib, the second rib, the third rib and the fourth rib by bending process.

[0037] Reference Figure 1 , Figure 5 and Figure 6As shown, it can be understood that multiple left convex bars 230 and multiple right convex bars 210 are provided. Multiple left convex bars 230 are arranged in the vertical direction, and multiple right convex bars 210 are arranged in the vertical direction. Multiple upper convex bars 240 and multiple lower convex bars 220 are provided. Multiple upper convex bars 240 are arranged in the horizontal direction, and multiple lower convex bars 220 are arranged in the horizontal direction.

[0038] Reference Figure 1 , Figure 5 and Figure 6 As shown, the first reinforcing rib 310 is sequentially connected to multiple left convex strips 230, multiple lower convex strips 220, multiple right convex strips 210 and multiple upper convex strips 240 to improve the compressive and bending stiffness of the vacuum drying furnace body and thus improve the reliability of the vacuum drying furnace body.

[0039] Reference Figure 1 , Figure 3 and Figure 6 As shown, specifically, the first reinforcing rib 310 is provided with a plurality of first grooves, which can be used to engage with the left protrusion 230, the lower protrusion 220, the right protrusion 210 or the upper protrusion 240, so that the first reinforcing rib 310 can fit against the outer wall surface of the furnace body 100, thereby improving the connection stability between the first reinforcing rib 310 and the furnace body 100.

[0040] Reference Figure 1 , Figure 3 and Figure 6 As shown, it can be understood that the multiple reinforcing ribs include a second reinforcing rib 320, which is arranged around the furnace body 100 in the vertical direction and connected to the furnace body 100.

[0041] Reference Figure 5 , Figure 6 and Figure 7 As shown, specifically, the second reinforcing rib 320 includes a fourth, fifth, and sixth rib connected in sequence. The fourth, fifth, and sixth ribs are connected to the left wall 140, rear wall 160, and right wall 120 of the furnace body 100, respectively, to achieve welding of the second reinforcing rib 320 to the furnace body 100. The length directions of the fourth and sixth ribs are both front-to-back, that is, the fourth and sixth ribs are parallel to the left protruding rib 230 and right protruding rib 210, respectively. The length direction of the fifth rib is left-to-right, that is, the fifth rib is parallel to the rear protruding rib 250, to achieve the surrounding and welding fixation of the second reinforcing rib 320 to the furnace body 100.

[0042] Reference Figure 5 , Figure 6 and Figure 7As shown, specifically, multiple rear protrusions 250 are provided, and the multiple rear protrusions 250 are arranged in a vertical direction to improve the compressive and bending stiffness of the vacuum drying furnace body, thereby improving the reliability of the vacuum drying furnace body.

[0043] Reference Figure 5 , Figure 6 and Figure 7 As shown, it should be noted that the second reinforcing rib 320 can be formed into the fourth, fifth and sixth ribs through a bending process.

[0044] Reference Figure 3 , Figure 4 and Figure 7 As shown, it can be understood that the multiple reinforcing ribs include a third reinforcing rib 330, which is arranged around the furnace body 100 in the left-right direction and connected to the furnace body 100. The rear protrusion 250 is arranged at an angle to the third reinforcing rib 330 and is fixedly connected.

[0045] Reference Figure 3 , Figure 4 and Figure 7 As shown, specifically, the third reinforcing rib 330 includes a seventh rib, an eighth rib, and a ninth rib connected in sequence, wherein the seventh rib, the eighth rib, and the ninth rib are respectively connected to the upper wall 150, the rear wall 160, and the lower wall 130 of the furnace body 100 to enhance the stability of the furnace body 100.

[0046] Reference Figure 3 , Figure 4 and Figure 7 As shown, the length directions of the seventh and ninth ribs are both front-to-back, that is, the seventh and ninth ribs are parallel to the upper convex rib 240 and the lower convex rib 220 respectively. The length direction of the eighth rib is up-to-down, that is, the eighth rib is arranged at a right angle to the rear convex rib 250 and welded together, so as to realize the surrounding and connection of the third reinforcing rib 330 with the furnace body 100.

[0047] Multiple rear protruding strips 250 are arranged at right angles to the eighth rib and are welded and fixed, which can improve the compressive and bending stiffness of the vacuum drying furnace body, thereby improving the reliability of the vacuum drying furnace body.

[0048] Reference Figure 3 , Figure 4 and Figure 7 As shown, it should be noted that the third reinforcing rib 330 can be formed into the seventh, eighth and ninth ribs through a bending process.

[0049] Reference Figure 1 , Figure 3 and Figure 4As shown, specifically, the first reinforcing rib 310 is arranged at right angles to the second reinforcing rib 320 on the left wall 140 and the right wall 120 and is welded thereto. One of the first reinforcing rib 310 and the second reinforcing rib 320 is provided with a second groove, which can be fitted into the other of the first reinforcing rib 310 and the second reinforcing rib 320, thereby realizing the right angle arrangement of the first reinforcing rib 310 and the second reinforcing rib 320 and enabling both the first reinforcing rib 310 and the second reinforcing rib 320 to be fitted and connected to the wall surface of the furnace body 100.

[0050] Reference Figure 1 , Figure 5 and Figure 6 As shown, specifically, the first reinforcing rib 310 is arranged at right angles to the third reinforcing rib 330 on the upper wall 150 and lower wall 130 of the furnace body 100 and is welded thereto. One of the first reinforcing rib 310 and the third reinforcing rib 330 is provided with a second groove, which can be fitted into the other of the first reinforcing rib 310 and the third reinforcing rib 330, thereby realizing the right-angle arrangement of the first reinforcing rib 310 and the third reinforcing rib 330 and enabling both the first reinforcing rib 310 and the third reinforcing rib 330 to be attached to the wall surface of the furnace body 100.

[0051] Reference Figure 1 , Figure 2 and Figure 7 As shown, specifically, the second reinforcing rib 320 is arranged at a right angle to the third reinforcing rib 330 on the rear wall 160 of the furnace body 100 and welded thereto. One of the second reinforcing rib 320 and the third reinforcing rib 330 is provided with a second groove, which can be fitted into the other of the second reinforcing rib 320 and the third reinforcing rib 330, thereby realizing the right angle arrangement of the second reinforcing rib 320 and the third reinforcing rib 330 and enabling both the second reinforcing rib 320 and the third reinforcing rib 330 to be attached to the wall surface of the furnace body 100.

[0052] Reference Figure 1 , Figure 2 and Figure 3 As shown, it is understandable that the left convex strip 230, right convex strip 210, upper convex strip 240, lower convex strip 220 and rear convex strip 250 have the same geometric feature parameters, which can be parameters such as length, width, and thickness. That is, the shape and size of the left convex strip 230, right convex strip 210, upper convex strip 240, lower convex strip 220 and rear convex strip 250 are consistent, so as to make the processing and forming of the vacuum drying furnace body easier.

[0053] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A vacuum drying furnace body, characterized in that, include: The furnace body (100) has a vacuum chamber (110). The outer wall surface of the furnace body (100) has a protrusion that protrudes from the inside to the outside. The protrusion forms a groove on the inner wall surface of the furnace body (100) that communicates with the vacuum chamber (110). The reinforcing ribs are connected to the outer wall of the furnace body (100), and at least one of the reinforcing ribs is arranged at an angle to the protrusion and is fixedly connected.

2. The vacuum drying furnace body according to claim 1, characterized in that, The protrusion includes multiple straight protrusions.

3. The vacuum drying furnace body according to claim 2, characterized in that, The protrusion includes a left protruding strip (230) provided on the left wall (140) of the furnace body (100); And / or, the protrusion includes a right protrusion (210) provided on the right wall (120) of the furnace body (100); And / or, the protrusion includes an upper protrusion (240) provided on the upper wall (150) of the furnace body (100); And / or, the protrusion includes a lower protrusion (220) provided on the lower wall (130) of the furnace body (100); And / or, the protrusion includes a rear protrusion (250) provided on the rear wall (160) of the furnace body (100).

4. The vacuum drying furnace body according to claim 3, characterized in that, The vacuum chamber (110) is open to the front. The protrusions include a left protrusion (230) on the left wall (140) of the furnace body (100), a right protrusion (210) on the right wall (120) of the furnace body (100), an upper protrusion (240) on the upper wall (150) of the furnace body (100), and a lower protrusion (220) on the lower wall (130) of the furnace body (100). The length directions of the left protrusion (230), the right protrusion (210), the upper protrusion (240), and the lower protrusion (220) are all in the front-back direction.

5. The vacuum drying furnace body according to claim 4, characterized in that, The plurality of reinforcing ribs include a first reinforcing rib (310), which is arranged around the furnace body (100) in the front-back direction and connected to the furnace body (100). The left convex strip (230), the lower convex strip (220), the right convex strip (210) and the upper convex strip (240) are all arranged at an angle to the first reinforcing rib (310) and fixedly connected.

6. The vacuum drying furnace body according to claim 3, characterized in that, The protrusions include a left protruding strip (230) on the left wall (140) of the furnace body (100), a rear protruding strip (250) on the rear wall (160) of the furnace body (100), and a right protruding strip (210) on the right wall (120) of the furnace body (100). The length direction of the rear protruding strip (250) is left-right, and the length directions of the left protruding strip (230) and the right protruding strip (210) are front-back.

7. The vacuum drying furnace body according to claim 6, characterized in that, The plurality of reinforcing ribs include a second reinforcing rib (320), which is arranged around the furnace body (100) in the vertical direction and connected to the furnace body (100).

8. The vacuum drying furnace body according to claim 3, characterized in that, The protrusions include an upper protrusion (240) on the upper wall (150) of the furnace body (100), a rear protrusion (250) on the rear wall (160) of the furnace body (100), and a lower protrusion (220) on the lower wall (130) of the furnace body (100). The length direction of the rear protrusion (250) is left-right, and the length directions of the upper protrusion (240) and the lower protrusion (220) are front-back.

9. The vacuum drying furnace body according to claim 8, characterized in that, The plurality of reinforcing ribs include a third reinforcing rib (330), which is arranged around the furnace body (100) in a left-right direction and connected to the furnace body (100). The rear protruding strip (250) is arranged at an angle to the third reinforcing rib (330) and is fixedly connected.

10. The vacuum drying furnace body according to claim 2, characterized in that, The protrusions include a left protruding strip (230) on the left wall (140) of the furnace body (100), a right protruding strip (210) on the right wall (120) of the furnace body (100), an upper protruding strip (240) on the upper wall (150) of the furnace body (100), a lower protruding strip (220) on the lower wall (130) of the furnace body (100), and a rear protruding strip (250) on the rear wall (160) of the furnace body (100). The left protruding strip (230), the right protruding strip (210), the upper protruding strip (240), the lower protruding strip (220), and the rear protruding strip (250) have the same geometric feature parameters. And / or, the reinforcing rib connected to the protrusion is provided with a first groove, the first groove being fitted into the protrusion.

Images