Nitrogen-protected hardening furnace
Patent Information
- Application Number
- CN202522507995.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-26
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-11-26
AI Technical Summary
[0004]然而目前的氮气循环装置在进行气体循环时，其循环路径的进气道为单点式，从而使氮气分布至炉体内部时的速度较慢，从而导致炉内部分区域的氧气置换速度较慢，氧含量偏差较高，使炉内底部到上部的氮气浓度不均衡，从而影响产品质量，为解决上述问题，现提出一种氮气保护硬化炉来解决上述问题
1、通过供氮管道使风机把氮气输送至存气仓内，通过把气仓作为氮气缓冲腔，再通过连通管使多个存气仓连为一体形成连通结构，利用连通结构使氮气在存气仓内充分混合，再通过放置板上的通气口均匀的向上喷射，从而可快速置换炉内氧气，使炉内底部到上部的氮气浓度更均匀，从而稳定产品生产的质量。
Smart Images
Figure CN224905661U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of nitrogen hardening furnace technology, and specifically to a nitrogen-protected hardening furnace. Background Technology
[0002] Unsaturated bonds in resins are prone to react with oxygen under high temperatures or ultraviolet radiation, leading to yellowing, embrittlement, or decreased mechanical strength. For example, automotive coating resins may experience reduced surface gloss and poorer weather resistance after air curing. Oxygen inhibits free radical polymerization, causing UV-cured resins to become sticky on the surface and incompletely cured internally. While traditional mercury lamp curing ovens provide energy, they cannot solve the problem of oxygen-inhibited polymerization.
[0003] In related technologies, high-purity nitrogen (≥99.99%) is introduced to replace the oxygen in the furnace, controlling the oxygen concentration below 100ppm (≤50ppm is required in the electronics industry), fundamentally eliminating the risk of oxidation. The nitrogen environment is not only suitable for thermosetting resins (such as epoxy resins), but can also significantly improve the UV curing effect. The air inlet of the traditional box-type curing furnace adopts a single-point air inlet, which is connected to the nitrogen supply pipeline through the waste heat recovery device at the back of the curing furnace. The nitrogen supply pipeline is introduced into the furnace, and then a recovery pipeline is connected to the waste heat recovery device at the bottom of the furnace, so that the nitrogen in the curing furnace is circulated, thereby improving the energy utilization rate.
[0004] However, current nitrogen circulation devices use a single-point inlet for the circulation path, which slows down the distribution of nitrogen into the furnace. This results in slower oxygen replacement in some areas of the furnace, leading to higher oxygen content deviations and uneven nitrogen concentration from the bottom to the top of the furnace, thus affecting product quality. To address these issues, a nitrogen-protected hardening furnace is proposed. Utility Model Content
[0005] In view of this, the present invention provides a nitrogen-protected hardening furnace. The present invention uses a nitrogen supply pipeline to deliver nitrogen to the gas storage chamber via a blower. The gas storage chamber is used as a nitrogen buffer chamber, and multiple gas storage chambers are connected together by a connecting pipe to form a connected structure. The connected structure allows the nitrogen to be fully mixed in the gas storage chamber, and then it is evenly sprayed upward through the air vents on the placement plate. This can quickly replace the oxygen in the furnace, making the nitrogen concentration more uniform from the bottom to the top of the furnace, thereby stabilizing the quality of product production.
[0006] To solve the above-mentioned technical problems, this utility model provides a nitrogen-protected hardening furnace, including a sealed door on the front of the box-type hardening furnace, a waste heat recovery device fixedly installed on the back of the box-type hardening furnace, a pair of nitrogen supply pipes connected to the top of the waste heat recovery device, a recovery pipe connected to the bottom of the waste heat recovery device, heating components installed on the left and right sides inside the box-type hardening furnace, a pair of fans installed on the top of the box-type hardening furnace, the fans being connected to the nitrogen supply pipes on the same side, a placement plate installed at the bottom of the box-type hardening furnace, several vents on the placement plate, multiple gas storage chambers installed at the bottom of the placement plate, and multiple connecting pipes connecting every two gas storage chambers. The air outlet of the fan passes through the nearest vent and is connected to the gas storage chamber.
[0007] One end of the nitrogen supply pipeline is connected to the waste heat recovery device, and the other end of the nitrogen supply pipeline is connected to the air inlet of the fan. The air outlet of the fan is equipped with a connector, which is used to connect the vertical pipe to the air outlet of the fan, so that the nitrogen gas delivered by the fan enters the vent connected to the vertical pipe. The air outlet of the connector is equipped with a vertical pipe connected to the vent.
[0008] A pair of lower exhaust pipes are respectively installed on the left and right side walls near the bottom of the box-type hardening furnace. The lower exhaust pipes are used to discharge oxygen from the bottom of the box-type hardening furnace. The lower exhaust pipes pass through the side walls of the box-type hardening furnace and are located above the placement plate. The exhaust end of the lower exhaust pipe is equipped with a first exhaust valve, which is used to control the opening and closing of the lower exhaust pipe.
[0009] A top exhaust pipe is symmetrically arranged at the top of the box-type hardening furnace. The top exhaust pipe is used to discharge oxygen from the top of the box-type hardening furnace. The top exhaust pipe passes through the rear wall of the box-type hardening furnace. A second exhaust valve is provided at the exhaust end of the top exhaust pipe. The second exhaust valve is used to control the opening and closing of the top exhaust pipe.
[0010] Several through holes are provided on one side of the upper exhaust pipe. The through holes are used to increase the oxygen intake area of the upper exhaust pipe and to allow oxygen from the top of the box-type hardening furnace to flow quickly into the upper exhaust pipe. A clamp is provided at the end of the upper exhaust pipe. The clamp is used to connect the top wall of the box-type hardening furnace to the upper exhaust pipe, thereby supporting the upper exhaust pipe. The clamp is connected to the top wall of the box-type hardening furnace.
[0011] A sealing ring is fixedly installed between the gas storage chamber and the vent. The sealing ring is used to reinforce the connection between the gas storage chamber and the vent, so that nitrogen can only be discharged from the vent.
[0012] A heating pipe is symmetrically arranged at the bottom of the placement plate. The heating pipe is used to heat the nitrogen flowing at the bottom of the placement plate. The heating pipe is located at the bottom of the connecting pipe. The end of the heating pipe passes through the rear wall of the box-type hardening furnace. The air inlet end of the heating pipe is equipped with a connector for connecting a hot air blower. The connector is used to connect the heating pipe to an external hot air blower, so that the hot air generated by the hot air blown into the wall of the gas storage chamber through the heating pipe to heat the nitrogen and the placement plate. The air outlet end of the heating pipe is equipped with an air diffuser to increase the air outlet area of the heating pipe.
[0013] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects: 1. Nitrogen is delivered to the gas storage chamber by a blower through a nitrogen supply pipeline. The gas storage chamber serves as a nitrogen buffer chamber, and multiple gas storage chambers are connected together through a connecting pipe to form a connected structure. The connected structure allows the nitrogen to be fully mixed in the gas storage chamber, and then it is evenly sprayed upward through the air vents on the placement plate. This can quickly replace the oxygen in the furnace, making the nitrogen concentration more uniform from the bottom to the top of the furnace, thereby stabilizing the quality of product production.
[0014] 2. The through hole is used to accelerate the oxygen intake area of the upper exhaust pipe. The through hole is used to allow oxygen at the top of the box-type hardening furnace to flow quickly into the upper exhaust pipe. The clamp is used to connect the top wall of the box-type hardening furnace with the upper exhaust pipe, thereby supporting the upper exhaust pipe.
[0015] 3. The sealing ring is used to reinforce the connection between the gas storage chamber and the vent, so that nitrogen can only be discharged from the vent. The sealing ring is also used to connect the various gas storage chambers into a whole. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a front sectional view of the present invention; Figure 3 This is a side sectional view of the present invention; Figure 4 This is a side sectional view of the present invention; Figure 5 This is a side sectional view of the present invention.
[0017] Explanation of reference numerals in the attached drawings: 100, box-type hardening furnace; 101, sealing door; 102, waste heat recovery device; 103, nitrogen supply pipeline; 104, recovery pipeline; 105, heating component; 200, fan; 300, placement plate; 301, vent; 302, gas storage chamber; 303, communicating vessel; 304, vertical pipe; 305, sealing ring; 306, connecting pipe; 400, lower exhaust pipe; 401, first exhaust valve; 402, upper exhaust pipe; 403, second exhaust valve; 404, through hole; 405, clamp; 500, heating pipe; 501, connector; 502, air diffuser. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of this utility model. Figure 1-5 The technical solutions of the embodiments of this utility model are clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.
[0019] like Figure 1-5 As shown: This embodiment provides a nitrogen-protected hardening furnace, including a sealed door 101 on the front of a box-type hardening furnace 100, a waste heat recovery device 102 fixedly installed on the back of the box-type hardening furnace 100, a pair of nitrogen supply pipes 103 connected to the top of the waste heat recovery device 102, a recovery pipe 104 connected to the bottom of the waste heat recovery device 102, heating components 105 respectively installed on the left and right sides inside the box-type hardening furnace 100, and a pair of fans 200 installed on the top of the box-type hardening furnace 100, one fan 200 located at the front of the furnace and the other fan 200 located at the rear of the furnace. The fans 200 can be FLD type fans 200, and high-temperature filters can be installed on the fans 200. The blower 200 is connected to the nitrogen supply pipeline 103 on the same side. The bottom of the box-type hardening furnace 100 is provided with a placement plate 300, which is welded to the inner wall of the box-type hardening furnace 100. The placement plate 300 is provided with several vents 301. When the vents 301 are evenly distributed on the surface of the placement plate 300, the gas discharged may not fill the entire furnace cavity of the box-type hardening furnace 100. The vents 301 also pass through the top wall of the gas storage chamber 302. The bottom of the placement plate 300 is provided with multiple gas storage chambers 302. Each pair of gas storage chambers 302 can be welded together by multiple connecting pipes 306. The air outlet of the blower 200 passes through the nearest vent 301 and is connected to the gas storage chamber 302.
[0020] In use, nitrogen is delivered to the vertical pipe 304 by the blower 200 through the nitrogen supply pipeline, and then to the gas storage chamber 302 through the vertical pipe 304. The gas storage chamber 302 is rectangular and serves as a nitrogen buffer chamber. Multiple gas storage chambers 302 are connected into a single interconnected structure through the connecting pipe 306. The interconnected structure allows the nitrogen to be fully mixed in the gas storage chamber 302, and then evenly sprayed upwards through the vent 301 on the placement plate 300. This quickly replaces the oxygen in the furnace, making the nitrogen concentration more uniform from the bottom to the top of the furnace, thereby stabilizing the quality of product production.
[0021] This embodiment provides a nitrogen-protected hardening furnace. like Figure 1 , 2 As shown in Figures 3 and 4: One end of the nitrogen supply pipeline 103 is connected to the waste heat recovery device 102, and the other end of the nitrogen supply pipeline 103 can be welded to the air inlet of the fan 200. The air outlet of the fan 200 is provided with a connector 303, which is cylindrical in shape. One end of the connector 303 is welded to the air outlet of the fan 200 through a pipe, and the other end of the connector 303 is welded to the vertical pipe 304. The connector 303 is used to connect the vertical pipe 304 to the air outlet of the fan 200, so that the nitrogen gas delivered by the fan 200 enters the vent 301 connected to the vertical pipe 304. The air outlet of the connector 303 is provided with a vertical pipe 304 connected to the vent 301, and the vertical pipe 304 is welded to the vent 301.
[0022] Its effect is as follows: the communicating vessel 303 is used to connect the vertical pipe 304 to the air outlet of the fan 200, so that the nitrogen gas delivered by the fan 200 enters the vent 301 connected to the vertical pipe 304.
[0023] like Figure 1 , 2 As shown: A pair of lower exhaust pipes 400 are respectively installed on the left and right side walls near the bottom of the box-type hardening furnace 100. The lower exhaust pipes 400 can be made of stainless steel. The lower exhaust pipes 400 pass through the furnace wall to support the lower exhaust pipes 400. The lower exhaust pipes 400 are used to discharge oxygen from the bottom of the box-type hardening furnace 100. The lower exhaust pipes 400 pass through the side walls of the box-type hardening furnace 100. The lower exhaust pipes 400 are located on the upper part of the placement plate 300. The exhaust end of the lower exhaust pipes 400 is provided with a first exhaust valve 401. The first exhaust valve 401 and the lower exhaust pipes 400 can be connected by a threaded seal. The first exhaust valve 401 is used to control the opening and closing of the lower exhaust pipes 400.
[0024] Its effect is as follows: the lower exhaust pipe 400 passes through the furnace wall through the through-hole to support the lower exhaust pipe 400, and the first exhaust valve 401 is used to control the opening and closing of the lower exhaust pipe 400.
[0025] like Figure 1 , 2 As shown in Figures 3 and 4: A top exhaust pipe 402 is symmetrically arranged at the top of the box-type hardening furnace 100. The top exhaust pipe 402 is made of stainless steel and is used to exhaust oxygen from the top of the box-type hardening furnace 100. The top exhaust pipe 402 passes through the rear wall of the box-type hardening furnace 100. A second exhaust valve 403 is provided at the exhaust end of the top exhaust pipe 402. The second exhaust valve 403 and the top exhaust pipe 402 can be connected by a threaded seal. The second exhaust valve 403 is used to control the opening and closing of the top exhaust pipe 402.
[0026] Its function is as follows: the upper exhaust pipe 402 is used to discharge oxygen from the top of the box-type hardening furnace 100, and the second exhaust valve 403 is used to control the opening and closing of the upper exhaust pipe 402.
[0027] like Figure 2 , 3 As shown in Figure 4: Several through holes 404 are provided on one side of the upper exhaust pipe 402. The through holes 404 only penetrate one side of the upper exhaust pipe 402. The through holes 404 are designed along the axial direction of the upper exhaust pipe 402. The through holes 404 are used to increase the oxygen intake area of the upper exhaust pipe 402. The through holes 404 are used to allow oxygen at the top of the box-type hardening furnace 100 to flow quickly into the upper exhaust pipe 402. A clamp 405 is provided at the end of the upper exhaust pipe 402. The clamp 405 is U-shaped. The top of the clamp 405 is connected and fixed to the top of the furnace wall with a high-temperature resistant bolt. The clamp 405 is used to connect the top wall of the box-type hardening furnace 100 with the upper exhaust pipe 402, thereby supporting the upper exhaust pipe 402. The clamp 405 is connected to the top wall of the box-type hardening furnace 100.
[0028] Its effects are as follows: the through hole 404 is used to accelerate the oxygen intake area of the upper exhaust pipe 402, the through hole 404 is used to allow the oxygen at the top of the box-type hardening furnace 100 to flow quickly into the upper exhaust pipe 402, and the clamp 405 is used to connect the top wall of the box-type hardening furnace 100 with the upper exhaust pipe 402, thereby supporting the upper exhaust pipe 402.
[0029] like Figure 2 , 3 As shown in Figure 5, a sealing ring 305 is fixedly installed between the gas storage chamber 302 and the vent 301. The upper end of the sealing ring 305 is welded to the vent 301 on the placement plate 300, and the lower end of the sealing ring 305 is sealed to the gas storage chamber 302. The sealing ring 305 is used to reinforce the connection between the gas storage chamber 302 and the vent 301, so that nitrogen can only be discharged from the vent 301.
[0030] Its effect is as follows: the sealing ring 305 is used to reinforce the connection between the gas storage chamber 302 and the vent 301, so that nitrogen can only be discharged from the vent 301. The sealing ring 305 is also used to connect the various gas storage chambers 302 into a whole.
[0031] like Figure 2 , 3 As shown in Figures 4 and 5: A heating pipe 500 is symmetrically arranged at the lower part of the placement plate 300. The heating pipe 500 penetrates the furnace wall and is used to heat the nitrogen gas flowing at the bottom of the placement plate 300. The heating pipe 500 is located below the connecting pipe 306. The end of the heating pipe 500 passes through the rear wall of the box-type hardening furnace 100. The air inlet end of the heating pipe 500 is provided with a connector 501 for connecting to the hot air blower 200. The connector 501 and the heating pipe 500 can be sealed by a flange. The connector 501 is used to connect the heating pipe 500 to the external hot air blower 200, so that the hot air generated by the hot air blower 200 is blown into the wall of the gas storage chamber 302 through the heating pipe 500 to heat the nitrogen and the placement plate 300. The outlet end of the heating pipe 500 is provided with an air diffuser 502, which is truncated cone in shape. The air diffuser 502 can be welded to the heating pipe 500 or connected by a threaded seal. The air diffuser 502 is used to increase the air outlet area of the heating pipe 500.
[0032] Its effect is as follows: the heating pipe 500 is used to heat the nitrogen flowing at the bottom of the placement plate 300. The air inlet end of the heating pipe 500 is provided with a connector 501 for connecting the hot air blower 200. The connector 501 is used to connect the heating pipe 500 to the external hot air blower 200, so that the hot air generated by the hot air blower 200 is blown into the wall of the gas storage chamber 302 through the heating pipe 500 to heat the nitrogen and the placement plate 300. The air diffuser 502 is used to expand the air outlet area of the heating pipe 500.
[0033] Working principle: Nitrogen gas is delivered to the vertical pipe 304 by the blower 200 through the nitrogen supply pipeline, and then to the gas storage chamber 302 through the vertical pipe 304. The gas storage chamber is used as a nitrogen buffer chamber, and multiple gas storage chambers 302 are connected into one through the connecting pipe 306 to form a connected structure. The connected structure allows the nitrogen gas to be fully mixed in the gas storage chamber 302, and then it is evenly sprayed upward through the vent 301 on the placement plate 300, which can quickly replace the oxygen in the furnace and make the nitrogen concentration from the bottom to the top of the furnace more uniform, thereby stabilizing the quality of product production.
[0034] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and 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.
[0035] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.
Claims
1. A nitrogen-protected hardening furnace, comprising a sealed door (101) on the front of a box-type hardening furnace (100), a waste heat recovery device (102) fixedly disposed on the back of the box-type hardening furnace (100), a pair of nitrogen supply pipes (103) connected to the top of the waste heat recovery device (102), a recovery pipe (104) connected to the bottom of the waste heat recovery device (102), and heating components (105) respectively disposed on the left and right sides inside the box-type hardening furnace (100), characterized in that: The box-type hardening furnace (100) is equipped with a pair of fans (200) on the top. The fans (200) are connected to the nitrogen supply pipeline (103) on the same side. The box-type hardening furnace (100) is equipped with a placement plate (300) at the bottom. The placement plate (300) is provided with several air vents (301). The placement plate (300) is provided with multiple gas storage chambers (302) at the bottom. Each pair of gas storage chambers (302) is connected by multiple connecting pipes (306). The air outlet of the fans (200) passes through the nearest air vent (301) and is connected to the gas storage chamber (302).
2. The nitrogen-protected hardening furnace as described in claim 1, characterized in that: One end of the nitrogen supply pipeline (103) is connected to the waste heat recovery device (102), and the other end of the nitrogen supply pipeline (103) is connected to the air inlet of the fan (200). The air outlet of the fan (200) is provided with a connector (303), and the air outlet of the connector (303) is provided with a vertical pipe (304) connected to the vent (301).
3. The nitrogen-protected hardening furnace as described in claim 2, characterized in that: A pair of lower exhaust pipes (400) are respectively provided on the left and right side walls near the bottom of the box-type hardening furnace (100). The lower exhaust pipes (400) pass through the side walls of the box-type hardening furnace (100). The lower exhaust pipes (400) are located on the upper part of the placement plate (300). The exhaust end of the lower exhaust pipe (400) is provided with a first exhaust valve (401).
4. A nitrogen-protected hardening furnace as described in claim 3, characterized in that: A top exhaust pipe (402) is symmetrically arranged at the top of the box-type hardening furnace (100). The top exhaust pipe (402) passes through the rear wall of the box-type hardening furnace (100), and a second exhaust valve (403) is provided at the exhaust end of the top exhaust pipe (402).
5. A nitrogen-protected hardening furnace as described in claim 4, characterized in that: The upper exhaust pipe (402) has several through holes (404) on one side of its pipe wall, and a clamp (405) is provided at the end of the upper exhaust pipe (402), which is connected to the inner top wall of the box-type hardening furnace (100).
6. A nitrogen-protected hardening furnace as described in claim 5, characterized in that: A sealing ring (305) is fixedly installed between the gas storage chamber (302) and the air vent (301).
7. A nitrogen-protected hardening furnace as described in claim 6, characterized in that: A heating pipe (500) is symmetrically arranged at the lower part of the placement plate (300). The heating pipe (500) is located at the lower part of the connecting pipe (306). The end of the heating pipe (500) passes through the rear wall of the box-type hardening furnace (100). The air inlet end of the heating pipe (500) is provided with a connector (501) for connecting to the hot air blower (200), and the air outlet end of the heating pipe (500) is provided with an air diffuser (502).