Heat exchanger and bell furnace with the heat exchanger

Abstract

The present invention discloses a heat exchanger and a bell furnace with the heat exchanger. The heat exchanger includes a shell and a water-cooling pipe for cooling water to pass through. The shell has a heat exchange cavity for gas to pass through. The heat exchange cavity is divided into a plurality of air chambers. The plurality of air chambers are interconnected through a connecting hole. The shell is provided with an air inlet connected to one of the air chambers and an air outlet connected to another air chamber. The water-cooling pipe passes through at least two air chambers. It has the advantages of compact structure, low cost, good heat exchange efficiency and heat exchange effect. The bell furnace includes a furnace body, a kiln car, a heating system, an air intake system and a cooling system. The cooling system includes a fan, a water cooler and the above-mentioned heat exchanger. The air inlet is connected to the furnace of the furnace body through an air intake pipeline, and the air outlet is connected to the furnace of the furnace body through an air outlet pipeline. Both ends of the water cooling pipe are connected to the water cooler, and the fan is arranged on the air outlet pipeline. It has the advantages of simple and compact structure, low cost, and good heat exchange performance.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment equipment, in particular to a heat exchanger and a bell furnace with the heat exchanger. Background Art

[0002] The bell-shaped furnace has excellent characteristics such as good temperature uniformity, flexible atmosphere furnace pressure control, easy maintenance, and high automation level. It is widely used in magnetic materials, special ceramics, functional ceramics, electronic components and other fields. Especially for high-end products in certain segments, the bell-shaped furnace is an indispensable key sintering equipment. At present, the development of new materials is changing with each passing day. From the beginning of research and development, a new product must be repeatedly verified in multiple stages such as small-scale tests and pilot tests before it can be put on the market. Among them, small-scale tests and pilot tests are crucial. At present, small experimental furnaces such as tubular furnaces and muffle furnaces are usually used for sintering tests. On the one hand, these small experimental furnaces have low performance and cannot meet the sintering process requirements of high-end materials. On the other hand, when the process is transplanted to the large-scale production bell-shaped furnace in the later stage, due to the difference in furnace design concepts, the verified process curve will inevitably be combined with the characteristics of the bell-shaped furnace. A lot of adjustments will be made, which will also lengthen the pilot verification cycle and increase the new product development cycle, which is not conducive to the rapid market launch of new products developed by enterprises.

[0003] Therefore, it is very important to develop a new test furnace with a bell furnace as a research and development test platform. On the one hand, the excellent performance of the bell furnace is more in line with the process requirements of new material research and development, and on the other hand, it is more convenient to transplant the process to large-scale production furnaces. However, the bell furnace is a complex thermal system that integrates temperature, atmosphere, and pressure. Not only does the furnace body include multiple systems such as heating system, atmosphere system, cooling system, and control system, but it also needs additional auxiliary systems such as cooling towers and rails. This undoubtedly increases the cost of use and raises the threshold for users to use experimental bell furnaces, especially for scientific research institutes. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide a heat exchanger with compact structure, low cost, good heat exchange efficiency and heat exchange effect, and correspondingly provide a bell furnace with the heat exchanger.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A heat exchanger comprises a shell and a water-cooling pipe for cooling water to pass through, the shell having a heat exchange cavity for gas to pass through, the heat exchange cavity being divided into a plurality of air chambers, the plurality of air chambers being interconnected through connecting holes, the shell being provided with an air inlet connected to one of the air chambers and an air outlet connected to another air chamber, the water-cooling pipe passing through at least two of the air chambers.

[0007] In the above-mentioned heat exchanger, preferably, a transverse partition is provided in the heat exchange cavity to divide the heat exchange cavity into two layers of cavities, and each cavity is divided into two or more air chambers arranged in sequence by one or more longitudinal partitions provided in the heat exchange cavity. Two adjacent air chambers in each layer of the cavity are connected by one or more connecting holes provided on the longitudinal partition, and at least one air chamber in each layer of the cavity is connected to an air chamber in another layer of the cavity through one or more connecting holes provided on the longitudinal partition, the air inlet is connected to an air chamber in one layer of the cavity, and the air outlet is connected to an air chamber in another layer of the cavity.

[0008] In the above heat exchanger, preferably, in each layer of the cavity, any connecting hole on one of two adjacent longitudinal partitions is staggered with the connecting holes on the other longitudinal partition in a non-opposite manner.

[0009] In the above-mentioned heat exchanger, preferably, the water-cooling pipe passes through each of the air chambers, and all the air chambers in each layer of the cavity are connected in sequence, wherein the last air chamber in one layer of the cavity is connected with the last air chamber in another layer of the cavity through one or more connecting holes provided on the transverse partition, the air inlet is connected with the first air chamber in one layer of the cavity, and the air outlet is connected with the first air chamber in another layer of the cavity.

[0010] In the above-mentioned heat exchanger, preferably, any two adjacent air chambers separated by the transverse partition are connected through one or more connecting holes provided on the transverse partition.

[0011] In the above-mentioned heat exchanger, preferably, all the air chambers are connected in sequence, the air inlet is connected to the first air chamber, and the air outlet is connected to the last air chamber.

[0012] In the above-mentioned heat exchanger, preferably, the diameter of the air inlet is smaller than the diameter of the air outlet.

[0013] As a general technical concept, the present invention also provides a bell furnace, including a furnace body, a kiln car, a heating system, an air intake system and a cooling system, the cooling system including a fan, a water cooler and the above-mentioned heat exchanger, the air inlet is connected to the furnace of the furnace body through an air inlet pipeline, the air outlet is connected to the furnace of the furnace body through an air outlet pipeline, both ends of the water cooling pipe are connected to the water cooler, and the fan is arranged on the air outlet pipeline.

[0014] In the bell-shaped furnace mentioned above, preferably, the cooling system further comprises a reflux pipeline connecting the air inlet pipeline and the air outlet pipeline, and the reflux pipeline is provided with a reflux valve for controlling the on-off of the reflux pipeline.

[0015] Preferably, the bell-shaped furnace described above is provided with an exhaust valve and a pressure regulating valve on the gas outlet pipeline.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] The heat exchanger of the present invention allows cooling water to pass through the water-cooling pipe during operation, and the gas to be cooled is passed from the air inlet to the heat exchange chamber. The gas to be cooled passes through the heat exchange chamber and is discharged from the air outlet. In the process, the gas contacts with the water-cooling pipe for heat exchange, thereby achieving the purpose of cooling and lowering the temperature. Since the heat exchange chamber is divided into a plurality of air chambers, and the plurality of air chambers are interconnected through connecting holes, and the water-cooling pipe passes through at least two air chambers, after the gas to be cooled enters the air chamber connected to the air inlet, it enters other air chambers through the connecting holes, and is finally discharged from the air outlet. Since the gas to be cooled enters another air chamber from one air chamber through the connecting holes, the gas to be cooled can be more fully contacted with the water-cooling pipe, and the residence time of the gas to be cooled in each air chamber is increased, thereby improving the heat exchange efficiency and heat exchange effect. The heat exchanger also has the advantages of compact structure and low cost, and is particularly suitable for small test furnaces.

[0018] The bell-shaped furnace of the present invention, due to the use of the heat exchanger of the present invention, also has the advantages of the heat exchanger. At the same time, the cooling system of the bell-shaped furnace adopts a combination of a heat exchanger, a fan and a water cooler, making the overall equipment simpler and more compact, and saving a large number of pipelines, cooling towers and other devices, with lower production costs and use costs, which is convenient for large-scale application in scientific research institutes, and also has excellent heat exchange performance and effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main cross-sectional structure of the heat exchanger.

[0020] Figure 2 It is a schematic diagram of the side cross-sectional structure of the heat exchanger.

[0021] Figure 3 It is a schematic diagram of the top cross-sectional structure of the heat exchanger (without the longitudinal partition).

[0022] Figure 4 It is a schematic diagram of the main structure of the bell furnace.

[0023] Figure 5 This is the schematic diagram of the bell furnace.

[0024] Legend:

[0025] 1. Water-cooling pipe; 2. Shell; 20. Air chamber; 21. Connecting hole; 22. Air inlet; 23. Air outlet; 24. Longitudinal partition; 25. Transverse partition; 3. Furnace body; 4. Kiln car; 5. Cooling system; 51. Fan; 52. Water cooler; 53. Air inlet pipeline; 54. Air outlet pipeline; 55. Return pipeline; 56. Return valve; 57. Exhaust valve; 58. Pressure regulating valve. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Embodiment 1:

[0028] like Figures 1 to 3 As shown, the heat exchanger of this embodiment includes a shell 2 and a water-cooling pipe 1 for cooling water to pass through. The shell 2 has a heat exchange cavity for gas to pass through. The heat exchange cavity is divided into a plurality of air chambers 20. The plurality of air chambers 20 are interconnected through a connecting hole 21. The shell 2 is provided with an air inlet 22 connected to one of the air chambers 20 and an air outlet 23 connected to another air chamber 20. The water-cooling pipe 1 passes through at least two air chambers 20. When the heat exchanger is working, cooling water passes through the water-cooling pipe 1, and the gas to be cooled is passed from the air inlet 22 to the heat exchange cavity. The gas to be cooled is discharged from the air outlet 23 through the heat exchange cavity. In the process, the gas contacts the water-cooling pipe 1 for heat exchange, thereby achieving the purpose of cooling and lowering the temperature. Since the heat exchange cavity is divided into a plurality of air chambers 20, the plurality of air chambers 20 are interconnected through the connecting holes 21, and the water cooling pipe 1 passes through at least two air chambers 20, the gas to be cooled enters the air chamber 20 connected to the air inlet 22, and then enters other air chambers 20 through the connecting holes 21, and finally is discharged from the air outlet 23. Since the gas to be cooled enters another air chamber 20 from one air chamber 20 through the connecting holes 21, the gas to be cooled can be more fully contacted with the water cooling pipe 1, and the residence time of the gas to be cooled in each air chamber 20 is increased, thereby improving the heat exchange efficiency and heat exchange effect. The heat exchanger also has the advantages of compact structure and low cost.

[0029] In this embodiment, a transverse partition 25 is provided in the heat exchange cavity to divide the heat exchange cavity into two layers of cavities, each cavity is divided into two or more gas chambers 20 arranged in sequence by one or more longitudinal partitions 24 provided in the heat exchange cavity, two adjacent gas chambers 20 in each layer of cavity are connected by one or more connecting holes 21 provided on the longitudinal partition 24, at least one gas chamber 20 in each layer of cavity is connected with one gas chamber 20 in another layer of cavity through one or more connecting holes 21 provided on the longitudinal partition 24, the air inlet 22 is connected with one gas chamber 20 in one layer of cavity, and the air outlet 23 is connected with one gas chamber 20 in another layer of cavity. The heat exchange cavity is divided into a plurality of gas chambers 20 by using transverse partitions 25 and longitudinal partitions 24, which is simple to manufacture and low in cost.

[0030] In this embodiment, in each layer of the cavity, any one of the connecting holes 21 on one of the two adjacent longitudinal partitions 24 is staggered with the connecting holes 21 on the other longitudinal partition 24 in a non-opposite manner. After the gas to be cooled enters the air chamber 20 through the connecting hole 21 on one longitudinal partition 24, it will not be discharged directly from the connecting hole 21 on the other longitudinal partition 24 along a straight path, which can further increase the retention time of the gas to be cooled in the air chamber 20, and the gas to be cooled is more fully in contact with the water-cooling pipe 1, further improving the heat exchange efficiency and heat exchange effect.

[0031] In this embodiment, the water-cooling pipe 1 passes through each air chamber 20, and all the air chambers 20 of each layer of the cavity are connected in sequence, and the last air chamber 20 of one layer of the cavity is connected with the last air chamber 20 of another layer of the cavity through one or more connecting holes 21 provided on the transverse partition 25, the air inlet 22 is connected with the first air chamber 20 in one layer of the cavity, and the air outlet 23 is connected with the first air chamber 20 in another layer of the cavity. In this way, the gas to be cooled will pass through each air chamber 20 in sequence and contact the water-cooling pipe 1 in each air chamber 20 for heat exchange, so that the overall heat exchange efficiency of the heat exchanger is further improved.

[0032] In other embodiments, any two adjacent air chambers 20 separated by the transverse partition 25 can be connected through one or more connecting holes 21 provided on the transverse partition 25. Each air chamber 20 has multiple air inlet points and air outlet points, and part of the gas to be cooled reciprocates between the multiple air chambers 20 for cooling, so that the heat exchange efficiency and heat exchange effect are higher.

[0033] In other embodiments, the multiple air chambers 20 may not be arranged in two layers, but all the air chambers 20 may be connected in sequence, the air inlet 22 may be connected to the first air chamber 20, and the air outlet 23 may be connected to the last air chamber 20, so that the gas to be cooled may pass through each air chamber 20 in sequence and contact the water cooling pipe 1 in each air chamber 20 for heat exchange. The multiple air chambers 20 may be arranged in any other form.

[0034] In this embodiment, the diameter of the air inlet 22 is smaller than the diameter of the air outlet 23, which is beneficial to increase the residence time of the gas in the heat exchange cavity and improve the heat exchange efficiency.

[0035] In this embodiment, the water cooling pipe 1 is extended in a non-linear manner through each gas chamber 20, that is, one end of the water cooling pipe 1 located in each gas chamber 20 is a non-linear segment, so as to increase the contact area with each gas chamber 20, so that the gas and the water cooling pipe 1 are fully in contact, and the heat exchange efficiency is improved. Preferably, the three-dimensional U-shaped coil is arranged in the heat exchange cavity. The above-mentioned water cooling pipe 1 is a metal pipe.

[0036] Embodiment 2:

[0037] like Figure 4 and Figure 5 As shown, a bell furnace comprises a furnace body 3, a kiln car 4, a heating system, an air intake system and a cooling system 5, wherein the cooling system 5 comprises a fan 51, a water cooler 52 and the heat exchanger in Example 1, wherein the air inlet 22 is communicated with the furnace of the furnace body 3 through an air inlet pipeline 53, and the air outlet 23 is communicated with the furnace of the furnace body 3 through an air outlet pipeline 54, and both ends of the water cooling pipe 1 are connected to the water cooler 52, and the fan 51 is arranged on the air outlet pipeline 54. When the fan 51 is started, the gas in the furnace enters the heat exchange cavity of the heat exchanger through the air inlet pipeline 53 and the air inlet 22 for cooling, and then returns to the furnace through the air outlet 23, the fan 51 and the air outlet pipeline 54 after cooling. The cooling system 5 of the bell furnace adopts a combination of a heat exchanger, a fan 51 and a water cooler 52, which makes the overall equipment simpler and more compact, and saves a large number of pipelines, cooling towers and other devices, with lower production and use costs, which is convenient for large-scale application in scientific research institutes, and also has excellent heat exchange performance and effect.

[0038] In this embodiment, the cooling system 5 further includes a return line 55 connecting the air inlet line 53 and the air outlet line 54, and a return valve 56 for controlling the opening and closing of the return line 55 is provided on the return line 55. When the temperature of the gas to be cooled introduced into the air inlet line 53 is too high, the return valve 56 can be controlled to be connected through the return valve 56, so that the gas cooled by the heat exchanger in the air inlet line 53 is introduced into the air inlet line 53 and mixed with the gas to be cooled in the air inlet line 53, thereby reducing the temperature of the gas entering the heat exchanger and further reducing the temperature of the gas output from the air outlet line 54, so as to avoid the gas temperature exceeding the tolerance range of the heat exchanger and affecting the life of the heat exchanger.

[0039] In this embodiment, an exhaust valve 57 and a pressure regulating valve 58 are provided on the gas outlet pipeline 54. The exhaust valve 57 can realize the discharge of glue gas and waste gas in the furnace, and also plays a role in simplifying the structure. Compared with the traditional structure in which the high-temperature exhaust valve is opened above the furnace, it not only simplifies the exhaust valve assembly, but also eliminates the high-temperature refractory material structure such as the related chimney, so that the sealing of the entire kiln is better. This is a reasonable exhaust solution for a small bell furnace for experiments, which has the characteristics of high practicality, low cost, simple structure and easy maintenance. The pressure regulating valve 58 is used to control the furnace pressure in the furnace.

[0040] The furnace body 3, kiln car 4, heating system and air intake system of the bell furnace all adopt existing technologies and will not be described in detail here.

[0041] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. For those skilled in the art, improvements and changes obtained without departing from the technical concept of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A heat exchanger, characterized in that: The invention comprises a shell (2) and a water-cooling pipe (1) for cooling water to pass through, the shell (2) having a heat exchange cavity for gas to pass through, the heat exchange cavity being divided into a plurality of air chambers (20), the plurality of air chambers (20) being interconnected via a connecting hole (21), the shell (2) being provided with an air inlet (22) communicating with one of the air chambers (20) and an air outlet (23) communicating with another air chamber (20), the water-cooling pipe (1) passing through at least two of the air chambers (20); The heat exchange cavity is provided with a transverse partition (25) for dividing the heat exchange cavity into two layers of cavities, each cavity is divided into two or more air chambers (20) arranged in sequence by one or more longitudinal partitions (24) provided in the heat exchange cavity, two adjacent air chambers (20) in each layer of cavities are connected by one or more connecting holes (21) provided on the longitudinal partition (24), at least one air chamber (20) in each layer of cavities is connected with one air chamber (20) in another layer of cavities by one or more connecting holes (21) provided on the longitudinal partition (24), the air inlet (22) is connected with one air chamber (20) in one layer of cavities, and the air outlet (23) is connected with one air chamber (20) in another layer of cavities; All the air chambers (20) are connected in sequence, the air inlet (22) is connected to the first air chamber (20), and the air outlet (23) is connected to the last air chamber (20).

2. The heat exchanger according to claim 1, characterized in that: In each layer of the cavity, any one of the communication holes (21) on one of the two adjacent longitudinal partitions (24) is staggered with the communication holes (21) on the other longitudinal partition (24) in a non-aligned manner.

3. The heat exchanger according to claim 1, characterized in that: The water cooling pipe (1) passes through each of the air chambers (20), and all the air chambers (20) in each layer of the cavity are connected in sequence, wherein the last air chamber (20) in one layer of the cavity is connected to the last air chamber (20) in another layer of the cavity via one or more connecting holes (21) provided on the transverse partition (25), the air inlet (22) is connected to the first air chamber (20) in one layer of the cavity, and the air outlet (23) is connected to the first air chamber (20) in another layer of the cavity.

4. The heat exchanger according to claim 1, characterized in that: Any two adjacent air chambers (20) separated by the transverse partition (25) are connected via one or more connecting holes (21) provided on the transverse partition (25).

5. The heat exchanger according to claim 1, characterized in that: The caliber of the air inlet (22) is smaller than the caliber of the air outlet (23).

6. A bell furnace, comprising a furnace body (3), a kiln car (4), a heating system, an air intake system and a cooling system (5), characterized in that: The cooling system (5) comprises a fan (51), a water cooler (52) and a heat exchanger according to any one of claims 1 to 5, the air inlet (22) is connected to the furnace of the furnace body (3) through an air inlet pipeline (53), the air outlet (23) is connected to the furnace of the furnace body (3) through an air outlet pipeline (54), both ends of the water cooling pipe (1) are connected to the water cooler (52), and the fan (51) is arranged on the air outlet pipeline (54).

7. The bell furnace according to claim 6, characterized in that: The cooling system (5) further comprises a return pipeline (55) connecting the air inlet pipeline (53) and the air outlet pipeline (54), and a return valve (56) for controlling the on-off of the return pipeline (55) is provided on the return pipeline (55).

8. The bell furnace according to claim 6, characterized in that: The air outlet pipeline (54) is provided with an exhaust valve (57) and a pressure regulating valve (58).

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