External water cooling device for high-temperature brazing

Abstract

The utility model relates to an external water cooling device for high-temperature brazing, which comprises an exhaust fan for driving high-temperature gas to flow, a high-temperature air inlet pipeline, an air inlet connecting pipe, a heat exchanger and a low-temperature air return pipeline, the high-temperature air inlet pipeline adopts a pipeline provided with an air outlet port communicated with the hearth, the high-temperature air inlet pipeline is further provided with a water-cooling interlayer, and water injection ports are formed in the two ends of a shell of the water-cooling interlayer respectively; the air inlet connecting pipe is a pipeline provided with a water-cooling interlayer, and the two ends of a shell of the water-cooling interlayer are respectively provided with a water injection port; the low-temperature air return pipeline adopts a pipeline provided with an air inlet port communicated with the hearth, the technical problem that the high-temperature section pipeline is prone to overheating deformation is solved, water cooling outside the furnace can be carried out when gas in the furnace is at a high temperature, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of heat treatment equipment, in particular to a gas water cooling device for a high-temperature furnace. Background Art

[0002] High temperature brazing furnaces are widely used in brazing and other bright heat treatment of stainless steel, carbon steel, brass, copper, ceramic and other parts in industries such as automobiles, diesel engines, aviation, aerospace, air conditioning and refrigeration, gas water heaters, electronics, microwave magnetrons, etc. The furnace temperature can reach thousands of degrees during operation. After the heat treatment process is completed, the vacuum chamber is filled with high-purity nitrogen for cooling to complete the entire process.

[0003] Because the temperature inside the furnace is too high when the hot working process is just completed, if external water cooling is used at this time, the connecting pipes will be deformed due to the high heat. Therefore, most of the water cooling of domestic brazing furnaces currently adopts internal cooling, and external water cooling can only be used in the low temperature section, which affects production efficiency. Utility Model Content

[0004] The utility model aims to provide an external water cooling device for high temperature brazing to solve the above technical problems.

[0005] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0006] The external water cooling device for high-temperature brazing includes an exhaust fan for driving the high-temperature gas flow, a high-temperature air inlet duct, an air inlet connecting pipe, a heat exchanger and a low-temperature return air duct; the high-temperature air inlet duct adopts a pipe provided with an air outlet port connected to the furnace, and is also provided with a water-cooled interlayer, and water injection ports are respectively provided at both ends of the outer shell of the water-cooled interlayer; the air inlet connecting pipe is a pipe provided with a water-cooled interlayer, and water injection ports are also respectively provided at both ends of the outer shell of the water-cooled interlayer; the low-temperature return air duct adopts a pipe provided with an air inlet port connected to the furnace; the heat exchanger adopts a tube-in-tube heat exchanger, including a tube shell, and a heat source inlet and a heat source outlet are provided at both ends of the tube shell. A cold source inlet and a cold source outlet are arranged at both ends of the outer wall of the shell, and a guide pipe is arranged axially inside the tube-in-tube heat exchanger. The cold source fluid enters the tube shell through the cold source inlet, flows through the guide pipe and then flows out from the cold source outlet; the high-temperature air inlet duct is connected to the heat source inlet of the heat exchanger through the air inlet connecting pipe; the heat source outlet of the heat exchanger is connected to the air inlet of the exhaust fan; the air outlet of the exhaust fan is connected to the air inlet of the low-temperature return air duct; a gas passage for circulating and cooling high-temperature gas is formed in sequence; a radiator is also arranged on the outer wall of the shell of the air inlet connecting pipe, and a radiator is also arranged on the outer wall of the shell of the high-temperature air inlet duct; a cooling fan is also arranged, and the air outlet of the cooling fan faces the two radiators.

[0007] The utility model is mainly used for external water cooling in the high temperature section, so it is necessary to solve the problem of overheating and deformation of the connecting pipes caused by high temperature. The utility model perfectly solves the problem of overheating and deformation of the pipes by adopting a water-cooled interlayer for the high temperature section pipes. Flowing cooling water is injected into the interlayer of the high temperature air inlet pipe and the air inlet connecting pipe to achieve forced water cooling of the high temperature section pipes to prevent overheating and deformation. In addition, for the high temperature section pipes, including the high temperature air inlet pipe and the air inlet connecting pipe, a radiator is also arranged on the outer wall of the shell, and a cooling fan is arranged to perform air cooling on the radiator, which further reduces the problem of overheating and deformation.

[0008] After passing through the high-temperature section of the pipeline, the high-temperature gas enters the heat exchanger to exchange heat and cool the high-temperature gas. The heat exchanger adopts a tube-column heat exchanger, which has the advantages of simple structure, small size, and easy and convenient cleaning and maintenance. In the tube-column heat exchanger, the high-temperature gas passes through multiple guide tubes, and a cold source fluid is immersed outside the guide tube. The high-temperature gas exchanges heat and cools down through the guide tube and the cold source fluid. The cooled gas returns to the brazing furnace through the exhaust fan outlet and the return air duct, achieving a cooling effect on the high-temperature gas in the brazing furnace.

[0009] Furthermore, a corrugated pipe is installed between the high-temperature air inlet duct and the air inlet connecting pipe.

[0010] The high-temperature section of the pipeline is used to guide high-temperature gas. During the guidance process, it is heated and the thermal expansion and contraction will cause the pipeline to expand. Therefore, the entire high-temperature section of the pipeline is decomposed into two parts: the high-temperature air inlet pipeline and the air inlet connecting pipe. A bellows is connected in the middle. The expansion deformation caused by thermal expansion and contraction is absorbed through the elasticity of the bellows to eliminate the damage caused by thermal stress in the pipeline.

[0011] Furthermore, a detachable plate heat exchanger is provided between the air outlet of the exhaust fan and the low-temperature return air duct; the detachable plate heat exchanger comprises a fixed front end plate and a movable rear end plate, plates and gaskets are arranged in sequence between the fixed front end plate and the movable rear end plate, the fixed front end plate is detachably connected to the movable rear end plate by clamping bolts and nuts, and the plates and gaskets arranged in sequence are fixed between the fixed front end plate and the movable rear end plate, the four corner holes of the plates and gaskets arranged in sequence separate the hot and cold fluids to flow in the flow channels on both sides of each plate, and heat exchange is performed across the plates; a heat source inlet, a heat source outlet, a cold source inlet, and a cold source outlet are provided at positions of the fixed front end plate corresponding to the four corner holes of the plates; the air outlet of the exhaust fan is connected to the heat source inlet, and the heat source outlet is connected to the low-temperature return air duct; a secondary high-temperature gas circulation cooling gas passage is formed in sequence.

[0012] The utility model adds a heat exchanger device after the tube array heat exchanger to further improve the cooling effect.

[0013] The detachable plate heat exchanger is equipped with multiple groups of heat exchange plates. Through the concave and convex patterns on the surface of the plates, the through holes at the four corners, and the gaskets, the cold and hot fluids are separated on both sides of the heat exchange plates for heat exchange. The contact area of ​​the heat exchange plates is large, so the plate heat exchanger has a very high heat exchange effect. Its heat transfer coefficient is 3-5 times higher than that of the tube heat exchanger, and the heat recovery rate can be as high as 90%. Moreover, the structure is compact and light, and the floor space is one-third of that of the tube heat exchanger, so the cooling effect is extremely efficient.

[0014] The detachable plate heat exchanger can also flexibly add or reduce heat exchange plates between the fixed front plate and the movable rear plate according to the flow and temperature of the high-temperature gas to meet the actual cooling needs.

[0015] Furthermore, the plate area of ​​the detachable plate heat exchanger is 0.24 to 1.6 square meters, with 30 to 60 plates per square meter.

[0016] The detachable plate heat exchanger is a new type of high-efficiency heat exchanger composed of a series of metal plates with a certain corrugated shape. Thin rectangular channels are formed between the metal plates, and heat is exchanged through the metal plates. Metal plates of different areas can be used according to actual needs, and the number of metal plates can be flexibly increased or decreased. The overall structure is compact and flexible, and it is simple and convenient to clean and maintain. The heat exchange temperature can be accurately controlled, and the heat exchange area is relatively large, so it has a higher heat exchange rate.

[0017] Furthermore, the cold source fluid is cooling water, and the cooling water after heat exchange and temperature increase is cooled by air in a cooling tower; the cooling tower includes a cooling water recovery interface, a cooling fan, a circulation pump, a cooling water output port and a water supply booster pump.

[0018] A cooling tower is a device that uses air to recycle and cool the heated cooling water. A circulating pump is installed inside the cooling tower to transport the water to a high place, and then the water falls freely. During the falling process, it contacts the air to cool down. The cooled circulating water is output to the outside through a booster pump and used as a cold source fluid to exchange heat with the high-temperature gas. The cooling water is recycled through the cooling tower to save water resources and reduce production costs.

[0019] Furthermore, an asbestos filter for filtering gas is provided between the air inlet connecting pipe and the heat source inlet of the heat exchanger.

[0020] The utility model utilizes the asbestos filter to filter tiny particles in high-temperature gas or harmful substances produced in brazing to purify the protective gas returned to the furnace.

[0021] Furthermore, O-rings are used to seal the high-temperature air inlet duct, the air inlet connecting pipe, the heat exchanger, and the exhaust fan.

[0022] O-rings are used to seal the external water cooling devices to prevent the protective gas filled in the brazing furnace from leaking out of the furnace during the circulation cooling process and to prevent the gas outside the furnace from mixing in, so as to protect the product quality of the heat-treated workpieces in the furnace from being affected.

[0023] The utility model adopts a water-cooled interlayer method for the high-temperature section pipeline to solve the technical problem that the high-temperature section pipeline is easy to overheat and deform, and then a radiator is arranged outside the high-temperature section pipeline shell and an air-cooling fan is introduced for forced air cooling, so as to realize a water-cooling and air-cooling mixed mode on the basis of water cooling, and further perfectly solves the problem that the high-temperature section pipeline is easy to deform after contacting the high-temperature gas, so that after the brazing furnace finishes the heat treatment work, it can enter the external cooling and cooling, and it is not necessary to wait until the low temperature before the external water cooling and cooling, which improves the work efficiency of the heat treatment. In terms of heat exchange, a tube-type heat exchanger is used for the first-level heat exchange, and a plate-type heat exchanger is used for the second-level heat exchange, which realizes the water cooling efficiency of the high-temperature gas very efficiently and improves the work efficiency. A cooling tower device for circulating cooling of cooling water is also introduced to realize circulating water use, save water resources, and reduce production and manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0025] Figure 1 It is a structural schematic diagram of the utility model.

[0026] Explanation of symbols:

[0027] 1. High-temperature air inlet duct; 2. Bellows; 3. Water inlet; 4. Air inlet connecting pipe; 5. Heat exchanger; 6. Exhaust fan; 7. Low-temperature return air duct. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present invention more understandable, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0031] Secondly, the "one embodiment" or "embodiment" referred to herein refers to a specific feature, structure or characteristic that can be included in at least one implementation of the utility model. The "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0032] Reference Figure 1 As shown, the external water cooling device for high-temperature brazing includes an exhaust fan 6 for driving the high-temperature gas flow, a high-temperature air inlet duct 1, an air inlet connecting pipe 4, a heat exchanger 5 and a low-temperature return air duct 7; the high-temperature air inlet duct 1 adopts a pipe provided with an air outlet port connected to the furnace, and is also provided with a water-cooled interlayer, and water injection ports 3 are respectively provided at both ends of the shell of the water-cooled interlayer; the air inlet connecting pipe 4 is a pipe provided with a water-cooled interlayer, and water injection ports 3 are also respectively provided at both ends of the shell of the water-cooled interlayer; the low-temperature return air duct 7 adopts a pipe provided with an air inlet port connected to the furnace; the heat exchanger 5 adopts a tube-in-tube heat exchanger, including a tube shell, and a heat source inlet and a heat source outlet are provided at both ends of the tube shell, A cold source inlet and a cold source outlet are arranged at both ends of the outer wall of the tube shell, and a guide pipe is arranged axially inside the tube-in-tube heat exchanger. The cold source fluid enters the tube shell through the cold source inlet, flows through the guide pipe and then flows out from the cold source outlet; the high-temperature air inlet duct 1 is connected to the heat source inlet of the heat exchanger 5 through the air inlet connecting pipe 4; the heat source outlet of the heat exchanger 5 is connected to the air inlet of the exhaust fan 6; the air outlet of the exhaust fan 6 is connected to the air inlet of the low-temperature return air duct 7; a gas passage for circulating and cooling the high-temperature gas is formed in sequence; a radiator is also arranged on the outer wall of the shell of the air inlet connecting pipe 4, and a radiator is also arranged on the outer wall of the shell of the high-temperature air inlet duct 1; a cooling fan is also arranged, and the air outlet of the cooling fan faces the two radiators.

[0033] The utility model is mainly used for external water cooling in the high temperature section, so it is necessary to solve the problem of overheating and deformation of the connecting pipes caused by high temperature. In this embodiment, the water-cooled interlayer method is used for the high temperature section pipe to perfectly solve the problem of pipe overheating and deformation. Flowing cooling water is injected into the interlayer of the high temperature air inlet pipe 1 and the air inlet connecting pipe 4 to achieve forced water cooling of the high temperature section pipe to prevent overheating and deformation. In addition, for the high temperature section pipe, including the high temperature air inlet pipe 1 and the air inlet connecting pipe 4, a radiator is also arranged on the outer wall of the shell, and a cooling fan is arranged to perform air cooling on the radiator, which further reduces the problem of overheating and deformation.

[0034] In this embodiment, the high-temperature gas enters the heat exchanger 5 after passing through the high-temperature section pipeline to exchange heat and cool the high-temperature gas. The heat exchanger 5 adopts a tube-row heat exchanger, which has the advantages of simple structure, small size, and simple and convenient cleaning and maintenance. In the tube-row heat exchanger, the high-temperature gas passes through a plurality of guide tubes, and a cold source fluid is immersed outside the guide tube. The high-temperature gas exchanges heat and cools down through the guide tube and the cold source fluid. The cooled gas returns to the brazing furnace through the air outlet of the exhaust fan 6 and the return air duct, thereby achieving a cooling effect on the high-temperature gas in the brazing furnace.

[0035] A corrugated pipe 2 is also installed between the high-temperature air inlet duct 1 and the air inlet connecting pipe 4 .

[0036] In this embodiment, the high-temperature section of the pipeline is used to guide the high-temperature gas. During the guiding process, it is heated itself, and the thermal expansion and contraction phenomenon will cause the pipeline to expand. Therefore, the entire high-temperature section of the pipeline is decomposed into two parts: a high-temperature air inlet pipeline 1 and an air inlet connecting pipe 4. The bellows 2 is connected in the middle. The expansion deformation caused by thermal expansion and contraction is absorbed by the elasticity of the bellows 2, thereby eliminating the damage caused by thermal stress of the pipeline.

[0037] A detachable plate heat exchanger is also arranged between the air outlet of the exhaust fan 6 and the low-temperature return air duct 7; the detachable plate heat exchanger includes a fixed front end plate and a movable rear end plate, and plates and gaskets are arranged in sequence between the fixed front end plate and the movable rear end plate, and the fixed front end plate is detachably connected to the movable rear end plate by clamping bolts and nuts, and the plates and gaskets arranged in sequence are fixed between the fixed front end plate and the movable rear end plate, and the four corner holes of the plates and gaskets arranged in sequence separate the hot and cold fluids to flow in the flow channels on both sides of each plate, and heat exchange is performed across the plates; the fixed front end plate is provided with a heat source inlet, a heat source outlet, a cold source inlet, and a cold source outlet at the positions corresponding to the four corner holes of the plates; the air outlet of the exhaust fan 6 is connected to the heat source inlet, and the heat source outlet is connected to the low-temperature return air duct 7; a secondary high-temperature gas circulation cooling gas passage is formed in sequence.

[0038] In this embodiment, a heat exchanger device is added after the tube-row heat exchanger to further improve the cooling effect.

[0039] The detachable plate heat exchanger is provided with multiple groups of heat exchange plates. Through the concave-convex patterns on the surface of the plates and the through holes at the four corners, as well as the gaskets, the cold and hot fluids are separated on both sides of the heat exchange plates for heat exchange. The contact area of ​​the heat exchange plates is large, so the plate heat exchanger has a very high heat exchange effect. Its heat transfer coefficient is 3-5 times higher than that of the tube heat exchanger 5, and the heat recovery rate can be as high as more than 90%. In addition, the structure is compact and light, and the floor space occupied is one-third of the tube heat exchanger 5, so the cooling effect is extremely efficient.

[0040] In this embodiment, the detachable plate heat exchanger can also flexibly add or reduce heat exchange plates between the fixed front end plate and the movable rear end plate according to the flow rate and temperature of the high-temperature gas to meet the actual cooling needs, so it is called detachable.

[0041] The plate area of ​​the detachable plate heat exchanger is 0.24 to 1.6 square meters, with 30 to 60 plates per square meter.

[0042] The detachable plate heat exchanger is a new type of high-efficiency heat exchanger composed of a series of metal plates with a certain corrugated shape. Thin rectangular channels are formed between the metal plates, and heat is exchanged through the metal plates. Metal plates of different areas can be used according to actual needs, and the number of metal plates can be flexibly increased or decreased. The overall structure is compact and flexible, and it is simple and convenient to clean and maintain. The heat exchange temperature can be accurately controlled, and the heat exchange area is relatively large, so it has a higher heat exchange rate.

[0043] The cold source fluid is cooling water, and the cooling water after heat exchange and temperature increase is cooled by air in a cooling tower; the cooling tower includes a cooling water recovery interface, a cooling fan, a circulation pump, a cooling water output port and a water supply booster pump.

[0044] In this embodiment, the cooling tower is a device that uses air to recycle and cool the heated cooling water. A circulating pump is provided in the cooling tower to transport the water to a high place, and then the water falls freely. During the falling process, the circulating water contacts the air to cool down. The cooled circulating water is output to the outside through a booster pump, and is used as a cold source fluid to exchange heat with the high-temperature gas. The cooling water is recycled through the cooling tower to save water resources and reduce production costs.

[0045] An asbestos filter for filtering gas is also provided between the air inlet connecting pipe 4 and the heat source inlet of the heat exchanger 5 .

[0046] In this embodiment, an asbestos filter is used to filter tiny particles in the high-temperature gas or harmful substances produced during brazing to purify the protective gas returned to the furnace.

[0047] The high-temperature air inlet duct 1, the air inlet connecting pipe 4, the heat exchanger 5, and the exhaust fan 6 are sealed and connected by an O-ring.

[0048] In this embodiment, O-rings are used for sealing connections between the external water cooling devices to prevent the protective gas filled in the brazing furnace from leaking out of the furnace during the circulation cooling process and to prevent mixing with the gas outside the furnace, so as to protect the product quality of the heat-treated workpieces in the furnace from being affected.

[0049] Furthermore, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described, i.e., those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention.

[0050] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, the development effort will be a routine task of design, fabrication, and production without undue experimentation.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. An external water cooling device for high temperature brazing, including an exhaust fan for driving the high temperature gas flow, characterized in that: It also includes a high-temperature air inlet duct, an air inlet connecting pipe, a heat exchanger and a low-temperature return air duct; The high-temperature air inlet duct is a duct provided with an air outlet port connected to the furnace, and is also provided with a water-cooling interlayer, and water injection ports are respectively provided at both ends of the outer shell of the water-cooling interlayer; The air inlet connecting pipe is a pipe provided with a water-cooling interlayer, and water injection ports are also provided at both ends of the outer shell of the water-cooling interlayer; The low-temperature return air duct is a duct provided with an air inlet port connected to the furnace; The heat exchanger adopts a tube-column heat exchanger, including a tube shell, a heat source inlet and a heat source outlet are arranged at both ends of the tube shell, a cold source inlet and a cold source outlet are arranged at both ends of the outer wall of the tube shell, and a guide pipe is arranged inside the tube-column heat exchanger along the axial direction. The cold source fluid enters the tube shell through the cold source inlet, flows through the guide pipe and flows out from the cold source outlet; The high-temperature air inlet duct is connected to the heat source inlet of the heat exchanger through the air inlet connecting pipe; The heat source outlet of the heat exchanger is connected to the air inlet of the exhaust fan; The air outlet of the exhaust fan is connected to the air inlet of the low-temperature return air duct; A gas passage for circulating and cooling high-temperature gas is sequentially formed; The outer wall of the shell of the air inlet connecting pipe is also provided with a radiator, and the outer wall of the shell of the high-temperature air inlet duct is also provided with a radiator; A cooling fan is also provided, and an air outlet of the cooling fan faces the two radiators.

2. The external water cooling device for high temperature brazing according to claim 1, characterized in that: A corrugated pipe is also installed between the high-temperature air inlet duct and the air inlet connecting pipe.

3. The external water cooling device for high temperature brazing according to claim 1, characterized in that: A detachable plate heat exchanger is also provided between the air outlet of the exhaust fan and the low-temperature return air duct; The detachable plate heat exchanger includes a fixed front end plate and a movable rear end plate, plates and gaskets are sequentially arranged between the fixed front end plate and the movable rear end plate, the fixed front end plate is detachably connected to the movable rear end plate through clamping bolts and nuts, and the sequentially arranged plates and gaskets are fixed between the fixed front end plate and the movable rear end plate, and the four corner holes of the sequentially arranged plates and gaskets separate the cold and hot fluids to flow in the flow channels on both sides of each plate, so as to perform heat exchange across the plates; The positions of the four corner holes of the fixed front end plate corresponding to the plate are provided with a heat source inlet, a heat source outlet, a cold source inlet, and a cold source outlet; The air outlet of the exhaust fan is connected to the heat source inlet, and the heat source outlet is connected to the low-temperature return air duct; A secondary high-temperature gas circulation cooling gas passage is formed in turn.

4. The external water cooling device for high temperature brazing according to claim 3, characterized in that: The plate area of ​​the detachable plate heat exchanger is 0.24 to 1.6 square meters, with 30 to 60 plates per square meter.

5. The external water cooling device for high temperature brazing according to claim 1, characterized in that: The cold source fluid is cooling water, and the cooling water after heat exchange and temperature increase is cooled by air in a cooling tower; The cooling tower comprises a cooling water recovery interface, a cooling fan, a circulation pump, a cooling water output port and a water supply booster pump.

6. The external water cooling device for high temperature brazing according to claim 1, characterized in that: An asbestos filter for filtering gas is also arranged between the air inlet connecting pipe and the heat source inlet of the heat exchanger.

7. The external water cooling device for high temperature brazing according to claim 1, characterized in that: O-rings are used to seal the air inlet duct, air inlet connecting pipe, heat exchanger and exhaust fan.

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