Box-type furnace equipment with gas preheating device

Abstract

The utility model discloses box-type furnace equipment with a gas preheating device. The box-type furnace equipment comprises an upper furnace body, a lower furnace body; the concentric-square-shaped cavity is formed in the lower furnace body, and the concentric-square-shaped cavity is communicated with the upper furnace body; the air inlet pipe is arranged at the lower end of the concentric-square-shaped cavity; the second thermocouple is arranged at the upper end of the concentric-square-shaped cavity; the second heating rod is arranged in the concentric-square-shaped cavity; a partition cavity is formed in the side wall of the upper furnace body; a plurality of circulating holes are formed in the inner top end and the inner bottom end of the partition cavity respectively; and a heat dissipation fan is arranged in the circulation hole in the inner bottom end. The equipment is compact in structure, small in size, simple to operate and convenient to use and maintain. The refractory bricks enclose to form the hollow-square-shaped cavity for heating gas, and meanwhile, the refractory bricks also serve as a base of the upper furnace body, so that the structure is compact, the size is small, a heating path is arranged in the hollow-square-shaped cavity in a bent manner, and the heating time of process gas is prolonged.

Description

Technical Field

[0001] This utility model belongs to the technical field of sintering furnace equipment, and in particular relates to a box furnace equipment with a gas preheating device. Background Technology

[0002] Sintering box furnaces play a crucial role in many industrial production fields, such as powder metallurgy and ceramic sintering. During the sintering process, various gases are required to enter the furnace, including gases needed for the reaction and inert gases for protection. The temperature difference between these externally introduced gases and the temperature inside the furnace can have a significant impact on the quality of the sintered products.

[0003] Traditional box-type furnace gas inlet devices are often located directly inside the main heating furnace body, which has several shortcomings. For example, the gas may not reach the reaction temperature, failing to meet the requirements of some high-efficiency sintering processes. Uneven temperature distribution within the furnace can lead to quality issues in some sintering processes and even affect the lifespan of the sintering equipment. Furthermore, existing preheating devices lack flexibility in adjusting and monitoring furnace temperature, and cannot be precisely adjusted according to different sintering process requirements.

[0004] Chinese patent document CN215337701U discloses a sintering furnace with uniform heating, including a furnace body and a support frame. The furnace body includes a furnace shell and a furnace lining. The furnace lining has an internal cavity, and the internal cavity is equipped with heating tubes. The sintering furnace also includes a rotating device, which includes a driving device, a transmission device, a positioning device, and a material receiving platform. The material receiving platform is located inside the internal cavity. The driving device drives the material receiving platform to rotate through the transmission device. The sintering furnace also includes a preheating device, which includes a heating blower and several air inlet pipes. The air inlet pipes are located inside the internal cavity and have several through holes.

[0005] In the aforementioned patented solution, the heating blower heats the gas while driving it into the sintering furnace cavity. However, due to the short residence time of the gas within the blower, i.e., the short heating time, the preheating temperature of the gas is limited. Reducing the gas flow rate within the blower and increasing the heating time will result in a slower gas flow rate or a smaller flow rate into the sintering furnace cavity, affecting sintering efficiency and sintering quality. Utility Model Content

[0006] To overcome the technical problems of limited preheating temperature or slow gas flow rate and small flow volume in existing sintering box furnaces, this invention aims to provide a box furnace with a gas preheating device. This is achieved by setting a preheating cavity for the process gas within the lower furnace body, extending the preheating path and time, and meeting the diverse process gas requirements of the upper furnace body. Furthermore, the side walls of the upper furnace body are designed as cavities to facilitate airflow and control the temperature of the upper furnace shell, increasing ease of use.

[0007] To achieve the above objectives, this utility model adopts the following technical solution: a box-type furnace with a gas preheating device, comprising an upper furnace body; a lower furnace body disposed at the lower end of the upper furnace body; a cavity disposed within the lower furnace body, the upper end of which communicates with the inner cavity of the upper furnace body; an inlet pipe disposed at the lower end of the cavity; a second thermocouple disposed at the upper end of the cavity; and a second heating rod disposed within the cavity. The upper furnace body has a partition cavity within its side wall; the top and bottom ends of the partition cavity each have multiple flow holes communicating with the outside; and a cooling fan is disposed within the flow hole at the bottom end.

[0008] Specifically, the cavity is formed by refractory bricks; the cavity includes multiple horizontal grooves arranged evenly in the longitudinal direction and multiple vertical grooves arranged evenly in the longitudinal direction; the horizontal grooves and the vertical grooves are connected end to end in sequence; and the second heating rod is respectively arranged in each of the horizontal grooves.

[0009] Specifically, the cavity includes a connecting pipe located at the center of the bottom end of the upper furnace body; the lower part of the connecting pipe is connected to the middle position of the uppermost horizontal groove; the second thermocouple is disposed inside the connecting pipe.

[0010] The process gas entering through the inlet pipe passes through the horizontal slot and the vertical slot in sequence, and then enters the inner cavity of the upper furnace body through the connecting pipe. The second thermocouple is used to monitor the temperature of the process gas entering the inner cavity.

[0011] Furthermore, it includes multiple bottom shells respectively disposed on the outer wall of the upper furnace body and the outer wall of the lower furnace body; multiple terminals are disposed on the side wall of the bottom shell; a sealing plate for closing the opening of the bottom shell is detachably connected to the bottom shell; and a cover for shielding the terminals is detachably connected to the bottom shell.

[0012] Specifically, the shield is slidably connected to the bottom shell; the shield has two symmetrically arranged sides along its sliding direction; the bottom shell has a plurality of track plates that are slidably connected to the corresponding sides.

[0013] Specifically, the track plate is provided with three folded plates that are evenly distributed in a linear manner, wherein there is a gap between the folded plate located in the middle and the folded plates located on both sides; the side slides within the gap.

[0014] Specifically, the cover is provided with a U-shaped opening; the U-shaped opening is directly opposite the terminal block; the opening of the U-shaped opening faces the upper furnace body.

[0015] Furthermore, a top plate is provided on the upper part of the upper furnace body; an exhaust pipe communicating with the inner cavity is provided at the center of the upper end of the top plate; a valve is provided on the exhaust pipe; two handles are symmetrically arranged at the upper end of the top plate; the exhaust pipe is located between the two handles.

[0016] Furthermore, multiple uniformly arranged rollers are horizontally arranged inside the upper furnace body; multiple first heating rods are respectively arranged above and below the rollers inside the upper furnace body; a support rod is arranged above the uppermost first heating rod inside the upper furnace body; the support rod is used to support the refractory material.

[0017] Furthermore, each of the cooling fans is evenly distributed along the circumference at the lower end of the upper furnace body; the lower furnace body is located in the middle of the circumference where the cooling fans are distributed.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. The process gas is heated as it flows through the mold cavity. The second thermocouple detects the temperature of the gas entering the upper furnace body. The equipment has a compact structure, small size, light weight, simple operation, and convenient use and maintenance. It can be used for sintering of various materials.

[0020] 2. The refractory bricks enclose the cavity for heating the gas, and at the same time, the refractory bricks also serve as the base of the upper furnace body, achieving a compact structure and small size. The curved heating path in the cavity increases the heating time of the process gas, and can provide a larger gas intake volume and gas intake rate under the specified temperature requirements.

[0021] 3. The terminal block of this utility model is covered by a shield, which is easy to remove, making it convenient to install and debug the terminal block. It also increases safety and prevents accidental contact. The shield has a simple structure and is easy to manufacture and assemble. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0024] Figure 3 For the present utility model Figure 2 Enlarged structural diagram of section A in the middle;

[0025] Figure 4 This is an exploded view of the junction box of this utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the shield and track plate of this utility model.

[0027] In the diagram: 1. Upper furnace body; 11. Inner cavity; 12. Partition cavity; 121. Flow hole; 13. Roller; 14. First heating rod; 15. Cooling fan; 16. Top plate; 161. Exhaust pipe; 162. Handle; 17. Support rod; 18. First thermocouple; 2. Lower furnace body; 21. U-shaped cavity; 211. Connecting pipe; 22. Second heating rod; 23. Inlet pipe; 24. Second thermocouple; 25. Refractory brick; 3. Junction box; 31. Bottom shell; 32. Sealing plate; 33. Cover; 331. U-shaped opening; 332. Side; 333. Array hole; 34. Track plate; 341. Folding plate; 35. Terminal post. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0029] In the description of this utility model, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" are based on the orientation or positional relationship shown in the accompanying 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. They should not be construed as limiting the specific protection scope of this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In this description of the utility model, "a number" means two or more, unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, terms such as "set" and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] See Figures 1-5 A box-type furnace device with a gas preheating device includes an upper furnace body 1, a lower furnace body 2 located at the center of the lower end of the upper furnace body 1, and three junction boxes 3; wherein, two of the junction boxes 3 are located on the side wall of the upper furnace body 1, and one of the junction boxes 3 is located on the side wall of the lower furnace body 2.

[0033] The upper furnace body 1 is enclosed by side walls to form an inner cavity 11; a hollow partition 12 is provided inside the side walls; flow holes 121 communicating with the outside are respectively provided at the upper and lower ends of the partition 12; a heat dissipation fan 15 is provided in the lower flow hole 121; each of the heat dissipation fans 15 is evenly distributed along the circumference; the lower furnace body 2 is located in the middle of the circumference where the heat dissipation fans 15 are distributed.

[0034] Multiple uniformly arranged rollers 13 are horizontally arranged in the middle of the inner cavity 11; multiple first heating rods 14 are respectively arranged above and below the rollers 13 in the inner cavity 11; a support rod 17 is arranged above the uppermost first heating rod 14 in the inner cavity 11; the support rod 17 is used to support the refractory material; two first thermocouples 18 are symmetrically arranged between the uppermost first heating rod 14 and the rollers 13.

[0035] The top of the inner cavity 11 is provided with a top plate 16; an air extraction pipe 161 communicating with the inner cavity 11 is provided at the center of the upper end of the top plate 16; a valve is provided on the air extraction pipe 161; two handles 162 are symmetrically arranged at the upper end of the top plate 16; the air extraction pipe 161 is located between the two handles 162.

[0036] The lower furnace body 2 is provided with a U-shaped cavity 21; the U-shaped cavity 21 is formed by refractory bricks 25; the U-shaped cavity 21 includes four longitudinally uniformly arranged horizontal grooves and three longitudinally uniformly arranged vertical grooves; the vertical grooves are located between two adjacent horizontal grooves, and the horizontal grooves and the vertical grooves are connected end to end in sequence; a second heating rod 22 is horizontally arranged in each of the horizontal grooves.

[0037] The cavity 21 includes a connecting pipe 211 vertically arranged at the center of the bottom of the upper furnace body 1; the lower part of the connecting pipe 211 is connected to the middle of the uppermost horizontal groove; a second thermocouple 24 is provided inside the connecting pipe 211; an air inlet pipe 23 is provided inside the lowermost horizontal groove; the other end of the air inlet pipe 23 is led out to the outside of the lower furnace body 2 by a pipeline.

[0038] The first heating rod 14 and the second heating rod 22 extend from the outer walls of the upper furnace body 1 and the lower furnace body 2, respectively. The first heating rod 14 and the second heating rod 22 are respectively directly opposite the adjacent junction box 3. The junction box 3 includes a bottom shell 31 respectively disposed on the outer wall of the upper furnace body 1 or the outer wall of the lower furnace body 2, a plurality of terminals 35 disposed on the bottom shell 31, a sealing plate 32 detachably connected to the bottom shell 31, and a cover 33 detachably connected to the bottom shell 31. The terminals 35 are electrically connected to the adjacent first heating rod 14 or second heating rod 22.

[0039] The shield 33 is slidably connected to the bottom shell 31; the shield 33 has two symmetrically arranged side edges 332 along its sliding direction; the bottom shell 31 has a plurality of track plates 34 respectively slidably connected to the corresponding side edges 332; the track plate 34 has three folded plates 341 evenly distributed linearly, wherein the folded plate 341 located in the middle is spaced apart from the folded plates 341 located on both sides; the side edges 332 slide within the spaced interval.

[0040] The shield 33 is provided with a U-shaped opening 331; the U-shaped opening 331 is directly opposite the terminal 35; the opening direction of the U-shaped opening 331 is towards the upper furnace body 1; the outer wall of the shield 33 is provided with a plurality of evenly distributed array holes 333.

[0041] Installation and commissioning: (1) During installation, the preheating device shall be installed in accordance with the design requirements. Ensure that the upper furnace body 1 and the lower furnace body 2 are tightly connected to prevent gas leakage. (2) During commissioning, first turn on the control system and set the initial flow rate adjustment degree and the operating parameters of the heating device. Then, monitor the gas pressure change and temperature in the sintering furnace through the second thermocouple 24 and the first thermocouple 18, and fine-tune the gas inlet device until the best preheating effect is achieved.

[0042] Operating process: (1) During the sintering process, the second heating rod 22 preheats the incoming gas. When the gas heating effect decreases to a certain extent, the thermocouple feedback control system will issue a warning signal, and the operator can replace the second heating rod 22 in time. (2) The gas inlet device adjusts the gas inlet flow rate in real time according to the instructions of the control system. For example, when the reaction in the sintering furnace is intense and more gas is required, the gas inlet speed is increased; when the reaction tends to be stable, the opening is appropriately reduced to maintain a suitable gas pressure in the upper furnace body 1. (3) The heating gas is heated from bottom to top to ensure that the temperature measured by the second thermocouple 24 is the temperature at which the gas enters the upper furnace body 1.

[0043] The above description is only a specific embodiment of the present utility model, but the technical features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A box furnace apparatus having a gas preheating device, characterized by: The upper furnace body; lower furnace body, the lower furnace body is arranged in the lower end of the upper furnace body; The return cavity is arranged in the lower furnace body, and the upper end of the return cavity is communicated with the inner cavity of the upper furnace body; The air inlet pipe is arranged at the lower end of the return cavity; The second thermocouple is arranged at the upper end of the return cavity; The second heating rod is arranged in the return cavity; The side wall of the upper furnace body is provided with a partition cavity; the inner top end and the inner bottom end of the partition cavity are respectively provided with a plurality of flow-through holes communicated with the outside; the flow-through holes located at the inner bottom end are provided with heat dissipation fans.

2. The box furnace installation of claim 1, wherein: The return cavity is surrounded by refractory bricks; the return cavity includes a plurality of longitudinally uniformly arranged horizontal grooves and a plurality of longitudinally uniformly arranged vertical grooves; the horizontal grooves and the vertical grooves are sequentially communicated in a head-to-tail manner; each of the horizontal grooves is respectively provided with the second heating rod.

3. The box furnace installation of claim 2, wherein: The return cavity includes a communication pipe arranged at the central position of the inner bottom end of the upper furnace body; the lower part of the communication pipe is communicated with the middle position of the uppermost horizontal groove; the second thermocouple is arranged in the communication pipe.

4. The box furnace installation according to any one of claims 1 to 3, characterized in that: A plurality of bottom shells are arranged on the outer wall of the upper furnace body and the outer wall of the lower furnace body respectively; the side wall of the bottom shell is provided with a plurality of terminal posts; the bottom shell is detachably connected with a sealing plate for sealing the opening of the bottom shell; the bottom shell is detachably connected with a cover for shielding the terminal posts.

5. The box furnace installation of claim 4, wherein: The cover is slidingly connected to the bottom shell; the cover is symmetrically provided with two side edges arranged along the sliding direction thereof; the bottom shell is provided with a plurality of track plates slidingly connected with corresponding side edges.

6. The box furnace installation of claim 5, wherein: The track plate is provided with three folding plates uniformly distributed along a line, wherein the folding plate located in the middle has a spacing between the folding plates located on both sides; the side edges slide in the spacing.

7. The box furnace installation of claim 4, wherein: The cover is provided with a U-shaped opening; the U-shaped opening is opposite to the terminal post; the opening direction of the U-shaped opening faces the upper furnace body.

8. The box furnace apparatus of any one of claims 1-3, wherein: The upper part of the upper furnace body is provided with a top plate; the top plate is provided with an air extraction pipe communicated with the inner cavity at the central position of the upper end thereof; the air extraction pipe is provided with a valve; the top plate is symmetrically provided with two handles at the upper end thereof; the air extraction pipe is located between the two handles.

9. The box furnace installation of any one of claims 1-3, wherein: A plurality of uniformly arranged roller rods are horizontally arranged in the upper furnace body; a plurality of first heating rods are arranged above and below the roller rods in the upper furnace body; a support rod is arranged above the uppermost first heating rod in the upper furnace body; the support rod is used to support the refractory material.

10. The box furnace apparatus of any one of claims 1-3, wherein: Each of the heat dissipation fans is uniformly distributed in the circumferential direction of the lower end of the upper furnace body; the lower furnace body is located in the middle part of the circumferential distribution of the heat dissipation fans.

Images