Shell type fin heat exchange device for drying machine

Abstract

The utility model discloses a shell type fin heat exchange device for a drying machine, which comprises an outer shell and two fin heat exchangers, the outer shell is respectively provided with an air inlet pipe and an air outlet pipe, and a partition plate is arranged inside the outer shell; according to the device, gas needing to be dried is discharged into the first heat exchange cavity through the gas inlet pipe, the gas is cooled through the fin type heat exchanger in the first heat exchange cavity, water in the gas is cooled and condensed to form water, in this way, the water content of the gas can be reduced, and the gas is discharged through the drainage valve connected with the first heat exchange cavity; and then the cooled gas enters the second heat exchange chamber and is matched with the other fin heat exchanger to heat the gas, and then the gas is exhausted through the gas outlet pipe, so that the gas is dried, meanwhile, in the device, only the fin heat exchanger in the second heat exchange chamber needs to be connected with the compressor, and the other fin heat exchanger does not need to be connected with the condenser; therefore, parts such as a condenser and a fan are reduced, and the cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange technology, and in particular to a shell-type finned heat exchange device for a dryer. Background Technology

[0002] Currently, the heat exchange devices used in refrigerated dryers on the market are all integrated systems consisting of two independent components: a condenser and an evaporator. A typical condenser comprises a fan, condenser tubes, a heat sink housing, etc., while the evaporator consists of condenser tubes, heat sinks, and a housing. Some refrigerated dryers use a shell-and-tube structure as the evaporator housing. Because the heat exchange systems of commonly used dryers consist of two independent components, the overall size of existing refrigerated dryers is relatively large. Due to different requirements, the condenser needs to be compatible with fans of different power ratings, which increases the overall cost and energy consumption. Furthermore, according to the working principle of existing refrigerated dryers, the compressed air becomes very cold after passing through the evaporator and cannot directly enter the air storage tank. Therefore, a separate temperature recovery device needs to be installed at the evaporator. Research and development are needed to address the space and cost issues of existing refrigerated dryers to achieve a stable and cost-effective integrated heat exchange device. Publication number CN102654366A discloses a finned heat exchanger, which includes a front cavity, a shell, a sealing element, a rear cavity, and supports, as well as a tube bundle composed of a front flange, heat exchange tubes, fins, baffles, and a rear flange. The right end face of the shell and the mating end face of the rear cavity are sealed together by the sealing element. The tube bundle is inserted from the left end of the shell, and the outer wall of the rear flange is clearance-fitted with the inner wall of the right end of the shell. The front flange of the tube bundle is located between the left end face of the shell and the end face of the front cavity and provides a sealing connection. This heat exchanger only has one heat exchanger, does not have a gas drying function, and has a large overall structure and high cost. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a shell-type finned heat exchange device for dryers that is low in cost and occupies a small space.

[0004] To achieve the above objectives, the present invention provides the following solution: a shell-type finned heat exchanger for a dryer, comprising an outer shell and two finned heat exchangers. The outer shell is provided with an inlet pipe and an outlet pipe. A partition plate is provided inside the outer shell to divide the interior of the outer shell into a first heat exchange chamber and a second heat exchange chamber. The partition plate is provided with an air guide hole. The first heat exchange chamber is connected to the second heat exchange chamber through the air guide hole. The inlet pipe is connected to the first heat exchange chamber, and the outlet pipe is connected to the second heat exchange chamber. Finned heat exchangers are provided in both the first and second heat exchange chambers. The first heat exchange chamber is connected to a drain valve.

[0005] The beneficial effects of this invention are as follows: It reduces the overall volume. The device discharges the gas to be dried into the first heat exchange chamber through an inlet pipe. The gas is cooled by a finned heat exchanger within the first heat exchange chamber, causing water in the gas to condense and form water. This reduces the water content of the gas. The water is then discharged through a drain valve connected to the first heat exchange chamber. The cooled gas then enters the second heat exchange chamber, where it is heated by another finned heat exchanger before being discharged through an outlet pipe. This achieves gas drying. Furthermore, in this device, only the finned heat exchanger in the second heat exchange chamber needs to be connected to the compressor; the other finned heat exchanger does not need to be connected to the condenser. This reduces the number of components such as the condenser and fan, lowering costs. The reduced number of components and the integration of the two finned heat exchangers into a single structure also results in a correspondingly smaller overall volume. This design can meet the heat exchange requirements for drying most gases and has broad application prospects.

[0006] Furthermore, the top and bottom surfaces of the partition plate are provided with a front baffle and a rear baffle, which are spaced apart from each other. The front baffle, the rear baffle, and the partition plate together constitute a first heat exchange chamber or a second heat exchange chamber, wherein the front baffle and the rear baffle together clamp and fix the finned heat exchanger.

[0007] Furthermore, the finned heat exchanger includes a heat exchange tube and multiple heat exchange fins, which are disposed on the heat exchange tube and arranged at intervals along the length of the heat exchange tube. The heat exchange tube is provided with two refrigerant inlet and outlet pipes. With the above structure, this invention allows for the input and output of refrigerant to facilitate heat exchange in the heat exchange tube.

[0008] Furthermore, the front baffle has multiple first mounting holes, and the outer casing has two second mounting holes, with both refrigerant inlet and outlet pipes passing through the first mounting holes and the second mounting holes in sequence.

[0009] Furthermore, both the first heat exchange chamber and the second heat exchange chamber are equipped with multiple first airflow baffles and multiple second airflow baffles. The multiple first airflow baffles and multiple second airflow baffles are arranged alternately. Every pair of adjacent first airflow baffles divides the outer side of the finned heat exchanger into multiple first flow channels, and every pair of adjacent second airflow baffles divides the inner side of the finned heat exchanger into multiple second flow channels. The first flow channels and the second flow channels are connected through the gaps between the multiple heat exchange fins.

[0010] Furthermore, one of the second flow channels in the first heat exchange chamber is connected to one of the second flow channels in the second heat exchange chamber through an air guide hole.

[0011] Furthermore, the air guide hole is equipped with a grille. With the above structure, this invention reduces the amount of water entering the second heat exchange chamber. Attached Figure Description

[0012] Figure 1 This is a three-dimensional view of the overall structure of this utility model.

[0013] Figure 2 This is an exploded view of the overall structure of this utility model.

[0014] Figure 3 This is a diagram of the internal structure of this utility model.

[0015] Wherein, 1 is the outer shell, 11 is the partition plate, 111 is the air duct, 12 is the first heat exchange chamber, 13 is the second heat exchange chamber, 14 is the air inlet pipe, 15 is the air outlet pipe, 16 is the drain pipe, 17 is the second mounting hole, 21 is the heat exchange pipe, 211 is the refrigerant inlet and outlet pipe, 22 is the heat exchange fin, 31 is the front baffle, 311 is the first mounting hole, 32 is the rear baffle, 33 is the first airflow baffle, 34 is the second airflow baffle, 3a is the first flow guide channel, and 3b is the second flow guide channel. Detailed Implementation

[0016] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0017] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0018] See appendix Figure 1 To be continued Figure 3As shown, a shell-type finned heat exchanger for a dryer includes an outer shell 1 and two finned heat exchangers. The outer shell 1 has an inlet pipe 14 and an outlet pipe 15. A partition plate 11 is provided inside the outer shell 1 to divide the interior of the outer shell 1 into a first heat exchange chamber 12 and a second heat exchange chamber 13. The partition plate 11 has a guide hole 111. The first heat exchange chamber 12 is connected to the second heat exchange chamber 13 through the guide hole 111. The inlet pipe 14 is connected to the first heat exchange chamber 12, and the outlet pipe 15 is connected to the second heat exchange chamber 13. Finned heat exchangers are provided in both the first heat exchange chamber 12 and the second heat exchange chamber 13. The first heat exchange chamber 12 is connected to a drain valve 16.

[0019] The finned heat exchanger located in the second heat exchange chamber 13 is connected to the compressor.

[0020] In this embodiment, a front baffle 31 and a rear baffle 32 are provided on the top and bottom surfaces of the partition plate 11. The front baffle 31 and the rear baffle 32 are spaced apart from each other. The front baffle 31, the rear baffle and the partition plate 11 together constitute the first heat exchange chamber 12 or the second heat exchange chamber 13. The front baffle 31 and the rear baffle 32 together hold and fix the finned heat exchanger.

[0021] In this embodiment, the finned heat exchanger includes a heat exchange tube 21 and multiple heat exchange fins 22. The multiple heat exchange fins 22 are disposed on the heat exchange tube 21 and are arranged sequentially at intervals along the length of the heat exchange tube 21. The heat exchange tube 21 is provided with two refrigerant inlet and outlet pipes 211. The front baffle 31 has multiple first mounting holes 311, and the outer casing 1 has two second mounting holes. The two refrigerant inlet and outlet pipes 211 pass through the first mounting holes 311 and the second mounting holes in sequence.

[0022] The compressor is connected to one of the refrigerant inlet / outlet pipes 211 of the finned heat exchanger in the second heat exchange chamber 13.

[0023] In this embodiment, both the first heat exchange chamber 12 and the second heat exchange chamber 13 are provided with multiple first airflow baffles 33 and multiple second airflow baffles 34. The multiple first airflow baffles 33 and multiple second airflow baffles 34 are arranged alternately. Every pair of adjacent first airflow baffles 33 divides the outer side of the finned heat exchanger into multiple first flow channels 3a, and every pair of adjacent second airflow baffles 34 divides the inner side of the finned heat exchanger into multiple second flow channels 3b. The first flow channels 3a and the second flow channels 3b are connected through the gaps between the multiple heat exchange fins 22.

[0024] In this embodiment, one of the second flow channels 3b in the first heat exchange chamber 12 and one of the second flow channels 3b in the second heat exchange chamber 13 are connected through an air guide hole 111; the air guide hole 111 is provided with a grid.

[0025] In this embodiment, the front baffle 31, the rear baffle 32, the first airflow baffle 33, and the second airflow baffle 34 are fixedly connected to the partition plate 11 by welding.

[0026] In this embodiment, the outer shell 1 has a cylindrical structure, which has significant pressure resistance.

[0027] In this embodiment, the specific heat exchange process is as follows: First, the dry gas enters a section of the first guide channel 3a in the first heat exchange chamber 12 through the air inlet pipe 13 of the outer shell 1. Then, after passing through the gaps between multiple heat exchange fins 22, the gas enters the second guide channel 3b. The gas flows in the second guide channel 3b until it reaches the end. Then, after passing through the gaps between multiple heat exchange fins 22, it enters the next section of the first guide channel 3a, forming a wave-shaped airflow.

[0028] The above steps are repeated until the air flows to the second guide channel 3b at the very end of the first heat exchange chamber 12. Then, it enters the second guide channel 3b at the end of the second heat exchange chamber 13 through the air guide hole 111. After passing through the gaps between multiple heat exchange fins 22, it enters the first guide channel 3a. The air flows in the first guide channel 3a. When it reaches the end, it enters the next second guide channel 3b through the gaps between multiple heat exchange fins 22. The above steps are repeated until the heat-exchanged gas enters the first guide channel 3a at the very end and is then discharged through the air outlet pipe 15.

[0029] In the first heat exchange chamber 12, the gas flows through multiple first flow guide channels 3a and multiple second flow guide channels 3b formed by multiple first flow baffles 33 and multiple second flow baffles 34. The gas flows according to the guide and is cooled during the process. The low-temperature refrigerant enters the heat exchange tube 21 through a refrigerant inlet / outlet pipe 211. The gas is cooled by heat exchange as it passes through the gaps between multiple heat exchange fins 22, and the water vapor in the gas condenses into liquid. The gas after heat exchange in the first heat exchange chamber 12 enters the second heat exchange chamber 13 through the air guide hole 111. The compressor supplies one type of refrigerant to the finned heat exchanger in the second heat exchange chamber 13. High-temperature refrigerant is introduced through pipe 211, while the dried gas is at a low temperature after heat exchange in the finned heat exchanger in the first heat exchange chamber 12. When the gas enters the second heat exchange chamber 13, it exchanges heat with the high-temperature refrigerant in the finned heat exchanger in the second heat exchange chamber 13, forming a heat exchange condition. This causes the temperature of the dried gas entering the second heat exchange chamber 13 to rise, and the temperature of the refrigerant in the finned heat exchanger in the second heat exchange chamber 13 to decrease. After passing through multiple sections of the first guide channel 3a and multiple sections of the second guide channel 3b, the gas is discharged through the outlet pipe 15. Thus, the gas completes the drying process and can directly enter the next process.

[0030] Meanwhile, the condensate formed during the entire heat exchange process will be discharged to the outside of the outer shell 1 through the drain valve 16 connected to the first heat exchange chamber 12 according to the control requirements.

[0031] Considering the different applications of the device in this embodiment, the outer shell 1 of this embodiment can adopt different specifications and materials, such as aluminum, stainless steel, etc. At the same time, the internal two-fin heat exchanger can also be selected with different structures according to the heat exchange area, such as microchannels, hydrophilic fins, etc. as heat exchange structures.

[0032] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any way. Any person skilled in the art can make more possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments, without departing from the scope of the technical solution of this utility model. Therefore, all equivalent changes made based on the concept of this utility model without departing from the content of the technical solution of this utility model should be covered within the protection scope of this utility model.

Claims

1. A shell-and-fin heat exchanger for a drying machine, comprising an outer shell (1) and two fin heat exchangers, characterized in that: The outer shell (1) is provided with an air inlet pipe (14) and an air outlet pipe (15), and a partition plate (11) is arranged in the outer shell (1), the partition plate (11) is used for separating the outer shell (1) into a first heat exchange chamber (12) and a second heat exchange chamber (13), the partition plate (11) is provided with a gas guide hole (111), the first heat exchange chamber (12) is communicated with the second heat exchange chamber (13) through the gas guide hole (111), the air inlet pipe (14) is connected with the first heat exchange chamber (12), the air outlet pipe (15) is connected with the second heat exchange chamber (13), and the first heat exchange chamber (12) and the second heat exchange chamber (13) are both provided with fin heat exchangers, wherein the first heat exchange chamber (12) is connected with a drain valve (16).

2. A shell and fin heat exchanging device for a drying machine according to claim 1, characterized in that: The top surface and the bottom surface of the partition plate (11) are both provided with a front baffle (31) and a rear baffle (32), the front baffle (31) and the rear baffle (32) are arranged in front of and behind each other, and the front baffle (31), the rear baffle and the partition plate (11) jointly form the first heat exchange chamber (12) or the second heat exchange chamber (13), wherein the front baffle (31) and the rear baffle (32) jointly clamp and fix the fin heat exchanger.

3. A shell and fin heat exchanger for a drying machine according to claim 2, wherein: The fin heat exchanger comprises a heat exchange pipe (21) and a plurality of heat exchange fins (22), the plurality of heat exchange fins (22) are arranged on the heat exchange pipe (21), and the plurality of heat exchange fins (22) are arranged in sequence and at intervals along the length direction of the heat exchange pipe (21), and the heat exchange pipe (21) is provided with two refrigerant inlet and outlet pipes (211).

4. A shell and fin heat exchanging device for a drying machine according to claim 3, characterized in that: The front baffle (31) is provided with a plurality of first mounting holes (311), and the outer shell (1) is provided with two second mounting holes, and the two refrigerant inlet and outlet pipes (211) sequentially pass through the first mounting holes (311) and the second mounting holes.

5. A shell and fin heat exchanger for a drying machine according to claim 3, wherein: The first heat exchange chamber (12) and the second heat exchange chamber (13) are both provided with a plurality of first airflow baffles (33) and a plurality of second airflow baffles (34), the plurality of first airflow baffles (33) and the plurality of second airflow baffles (34) are arranged in front of and behind each other in an interlaced and interval manner, every two adjacent first airflow baffles (33) divide the outer side of the fin heat exchanger into a plurality of first flow guide channels (3a), every two adjacent second airflow baffles (34) divide the inner side of the fin heat exchanger into a plurality of second flow guide channels (3b), and the first flow guide channels (3a) and the second flow guide channels (3b) are communicated through the gaps between the plurality of heat exchange fins (22).

6. A shell and fin heat exchanging device for a drying machine according to claim 5, wherein: One of the second flow guide channels (3b) in the first heat exchange chamber (12) and one of the second flow guide channels (3b) in the second heat exchange chamber (13) are communicated through the gas guide hole (111).

7. A shell and fin heat exchanger for a drying machine according to claim 1, wherein: The gas guide hole (111) is provided with a grille.

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