Double-loop heat exchanger

Abstract

The utility model belongs to the technical field of exchangers, and particularly relates to a double-loop heat exchanger which comprises a plurality of circulating pipelines, liquid inlets are formed in the two ends of the lower side of each circulating pipeline respectively, liquid outlets are formed in the two ends of the upper side of each circulating pipeline respectively, and a protective fence is arranged on the periphery of each circulating pipeline. And an air supply channel for air circulation is arranged in the protective enclosure and passes through the plurality of circulating pipelines. Each liquid passing pipeline in the protective fence is matched with a liquid passing pipeline opposite to the liquid passing pipeline, the directions of oil in the two pipelines are completely symmetrical, the low-temperature far end of one pipeline is close to the near end of the other pipeline, and the low-temperature area and the high-temperature area of the two pipelines can be mutually balanced and complemented. The temperatures of all the areas in the protective fence are kept relatively balanced, and the temperature difference of the hot flow air outlet is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of exchangers, and in particular relates to a double-circuit heat exchanger. Background Art

[0002] A heat exchanger, also known as a heat exchanger or heat exchange equipment, is a device used to transfer heat from a hot fluid to a cold fluid to meet specified process requirements. It is an industrial application of convective heat transfer and heat conduction.

[0003] A gas heater disclosed in patent CN211060396U includes an air duct cover, a flame spraying component, a heat exchange component, a heat conduction component, and a fan component. The two ends of the flame spraying component are respectively connected to the gas source and the heat exchange component. The two ends of the heat exchange component are respectively located on the outside of the air duct cover, and the middle part is located in the air duct cover. The heat exchange component is located at one end of the air inlet of the fan component in the air duct cover, and the heat conduction component is fixed on the outside of the heat exchange component. When the fan component is working, the air flow flows from one end of the air inlet to one end of the air outlet. Gas is used for heating, and the heat generation is large. The heat exchange component is arranged on the outside of the flame spraying component, so that the flame can be directly sprayed into the heat exchange component, thereby improving the heat utilization effect. A spoiler reduction component is arranged in the heat exchange component. Under the condition of the same heat generation, the length of the heat exchange component can be reduced, thereby reducing the volume of the overall heater.

[0004] In the above scheme, the heat exchange tube extends from one side of the air duct cover to the other side of the box body, and presents a U-shaped bending structure in the air duct cover to improve the heat exchange effect. However, the heat source material in the heat exchange tube only flows from one end of the pipe to the other end. The heat source material will gradually lose heat as it flows in the pipe. Therefore, there will be a large temperature difference between the heat that can be provided at the rear end of the heat exchange tube and the front end. This will cause the airflow discharged from the air duct cover to have an uneven temperature. Especially in the coating process, for the heating after glue coating, it will cause the workpiece to have an uneven texture, which will seriously affect the product quality. Utility Model Content

[0005] The purpose of the utility model is to provide a double-circuit heat exchanger that can solve the above technical problems.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A dual-circuit heat exchanger, characterized in that it includes a heat exchanger body formed by a combination of two serpentine circulation pipes, wherein the liquid inlet and the liquid outlet of one of the circulation pipes are located on one side of the heat exchanger body and extend radially from the protective enclosure, and the liquid inlet and the liquid outlet of the other circulation pipe are located on the other side of the heat exchanger body and extend radially from the protective enclosure, the one side and the other side are relatively distributed, and the two circulation pipes exchange heat with each other.

[0008] In the double-circuit heat exchanger, the circulation pipeline includes a plurality of straight pipes and bent pipes, and the bent pipe connects two adjacent straight pipes to form a reciprocating serpentine pipeline channel between the liquid inlet and the liquid outlet.

[0009] In the double-circuit heat exchanger, the straight tubes are sleeved with heat dissipation fins, and the heat dissipation fins overlap the upper and lower straight tubes.

[0010] In the dual-circuit heat exchanger, the curved pipe is in a semicircular shape with a 180° bend angle, and the straight pipes are parallel to each other and maintain the same spacing.

[0011] In the dual-circuit heat exchanger, the protective enclosure includes a filter and a partition, the partition is set up on both sides of the liquid inlet and the liquid outlet, and the filter connects the two partitions together in a ring shape.

[0012] In the dual-circuit heat exchanger, the filter screen and the partition plate together form the air supply channel, and a plurality of the circulation pipes are evenly arranged horizontally in the air supply channel.

[0013] In the dual-circuit heat exchanger, a transition cavity is provided at the connection between the circulation pipeline and the liquid inlet and the liquid outlet, and the transition cavity has an inner diameter larger than that of the circulation pipeline.

[0014] In the double-circuit heat exchanger, the pipeline ports of the circulation pipelines in the same direction are connected to the same transition chamber, and the transition chamber is also provided with an oil seepage flange.

[0015] The advantages of the utility model are:

[0016] Each liquid pipeline in the protective enclosure is matched with a corresponding liquid pipeline. The direction of the oil in the two pipelines is arranged completely symmetrically, so that the lower temperature far end of one pipeline is close to the near end of the other pipeline. The low temperature and high temperature areas of the two pipelines can balance and complement each other, so that the temperature of each area in the protective enclosure remains relatively balanced, avoiding temperature differences at the hot flow outlets.

[0017] Each pipeline is set to the liquid inlet mode of the lower inlet and upper outlet, so that the heat of the lower high-temperature section contacts the upper low-temperature section during the rising process, thereby making up for the insufficient temperature of the upper end and avoiding the heat waste caused by the liquid inlet of the upper section. At the same time, a transition chamber is set at the liquid inlet to aggregate and connect various oil pipes to avoid the heat difference in each oil pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the front view of the utility model.

[0019] Figure 2 It is a top view of the utility model.

[0020] Figure 3 It is a side view of the utility model.

[0021] Figure 4 This is a schematic diagram of the circulation pipeline structure of the utility model.

[0022] In the figure, there are a liquid inlet 1, a liquid outlet 2, a protective enclosure 3, a filter 31, a partition 32, an air supply channel 4, a circulation pipeline 5, a straight pipe 51, a curved pipe 52, and a transition chamber 6. DETAILED DESCRIPTION

[0023] The following are specific embodiments of the utility model and the accompanying drawings to further describe the technical solution of the utility model, but the utility model is not limited to these embodiments.

[0024] Example 1

[0025] like Figure 1-Figure 4 As shown, the double-circuit heat exchanger is characterized in that it includes a heat exchanger body formed by combining two serpentine circulation pipes 5, wherein the liquid inlet 1 and the liquid outlet 2 of one of the circulation pipes 5 are located on one side of the heat exchanger body and extend radially from the protective enclosure 3, and the liquid inlet 1 and the liquid outlet 2 of the other circulation pipe 5 are located on the other side of the heat exchanger body and extend radially from the protective enclosure 3, the one side and the other side are relatively distributed, and the two circulation pipes 5 exchange heat with each other.

[0026] That is, each liquid pipeline in the protective enclosure is matched with a corresponding liquid pipeline, and the direction of the oil in the two pipelines is arranged completely symmetrically, so that the lower temperature far end of one pipeline is close to the proximal end of the other pipeline. The low temperature zone and high temperature zone of the two pipelines can balance and complement each other, so that the temperature of each area in the protective enclosure remains relatively balanced, avoiding temperature difference at the hot flow outlet.

[0027] The liquid inlet 1 and the liquid outlet 2 of the circulation pipe 5 are arranged on the same side, and the two circulation pipes 5 are respectively connected to a circulation heating system, so that the oil circulation heating system can be installed on one side of the protective enclosure 3, reducing the length of the pipeline outside the protective enclosure 3 to avoid ineffective heat loss.

[0028] Preferably, the circulation pipeline 5 includes a plurality of straight pipes and bent pipes. The bent pipe connects two adjacent straight pipes to form a reciprocating serpentine pipeline channel between the liquid inlet 1 and the liquid outlet 2 to increase the contact area with the air, thereby greatly improving the efficiency of heat exchange without increasing the occupied space.

[0029] Preferably, heat dissipation fins are provided on the straight tubes, and the heat dissipation fins overlap the upper and lower straight tubes.

[0030] The heat dissipation fins not only increase the contact area between the pipeline and the air, but also strengthen the temperature exchange between different sections of the pipeline, making the heat in each section of the pipeline more uniform.

[0031] Preferably, the curved pipe is in a semicircular shape with a 180° bend angle, and the straight pipes are parallel to each other and maintain the same spacing.

[0032] Maintaining the same spacing between the straight tubes can control the heat accumulated at various positions in the protective enclosure 3 to remain within a stable value.

[0033] In this embodiment, the protective enclosure 3 includes a filter screen 31 and a partition plate 32 . The partition plate 32 is arranged on both sides of the liquid inlet 1 and the liquid outlet 2 . The filter screen 31 connects the two partition plates 32 together in a ring shape.

[0034] The fan blowing the hot flow operates toward the filter 31 to deliver the heat to the workpiece position, and the filter 31 can filter the debris carried in the air flow into the protective enclosure 3, thereby protecting the heating pipeline, and the partition 32 isolates the air flow from the oil pipeline outside the protective enclosure 3 to prevent the oil pipeline from contacting the air flow and causing heat loss in advance.

[0035] Preferably, the filter screen 31 and the partition plate 32 together form an air supply channel 4 , and a plurality of circulation pipes 5 are evenly arranged horizontally in the air supply channel 4 .

[0036] In this embodiment, a transition cavity 6 is provided at the connection between the circulation pipeline 5 and the liquid inlet 1 and the liquid outlet 2 . The transition cavity 6 has an inner diameter greater than that of the circulation pipeline 5 .

[0037] The oil in the pipeline enters the transition chamber 6 with a larger volume, and after being collected to a certain amount in the transition chamber 6, it is passed into the protective enclosure 3. During this process, the air that may be carried in the oil can be blocked in the transition chamber 6, thereby improving the heat exchange rate of the heat exchanger.

[0038] Preferably, the pipeline ports of each circulation pipeline 5 at the same position are connected to the same transition chamber 6, and the transition chamber 6 is also provided with an oil-seepage flange.

[0039] The oil in multiple pipelines is gathered into the same transition chamber 6 to integrate the temperature difference of the oil in each pipeline, so that the temperature difference of the oil in each pipeline that subsequently enters the protective enclosure 3 is reduced, ensuring that each position in the protective enclosure 3 has a balanced temperature.

[0040] Example 2

[0041] On the basis of Example 1, the arrangement of the circulation pipeline 5 is changed, and the circulation pipeline 5 includes two circulation pipelines 5 symmetrically stacked together, one end of the circulation pipeline 5 is connected to the liquid inlet 1, and the other end of the circulation pipeline 5 is connected to the liquid outlet 2 on the opposite side.

[0042] Similarly, a circulating heating system is connected to each side of the protective enclosure 3, except that the outlet of one pipeline is heated by the system and then passed into the inlet of another pipeline, changing the pipeline self-circulation mode to a cross-circulation mode, so that the oil can pass through two circulating heating systems, thereby balancing the difference between the two circulating heating systems again.

[0043] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. Double circuit heat exchanger, characterized in that: The invention comprises a heat exchanger body formed by combining two serpentine circulation pipes (5), wherein the liquid inlet (1) and the liquid outlet (2) of one of the circulation pipes (5) are located on one side of the heat exchanger body and extend radially from a protective enclosure (3), and the liquid inlet (1) and the liquid outlet (2) of the other circulation pipe (5) are located on the other side of the heat exchanger body and extend radially from the protective enclosure (3), the one side and the other side are arranged relative to each other, and the two circulation pipes (5) perform heat exchange with each other.

2. The dual-circuit heat exchanger according to claim 1, characterized in that: The circulation pipeline (5) comprises a plurality of straight pipes and bent pipes, wherein the bent pipe connects two adjacent straight pipes to form a reciprocating serpentine pipeline channel between the liquid inlet (1) and the liquid outlet (2).

3. The dual-circuit heat exchanger according to claim 2, characterized in that: The straight tubes are sleeved with heat dissipation fins, and the heat dissipation fins overlap the upper and lower straight tubes.

4. The dual-circuit heat exchanger according to claim 2, characterized in that: The curved pipe is in a semicircular shape with a 180° curved angle, and the straight pipes are parallel to each other and maintain the same spacing.

5. The dual-circuit heat exchanger according to claim 1, characterized in that: The protective enclosure (3) comprises a filter screen (31) and a partition plate (32), wherein the partition plate (32) is arranged on both sides of the liquid inlet (1) and the liquid outlet (2), and the filter screen (31) connects the two partition plates (32) together in a ring shape.

6. The dual-circuit heat exchanger according to claim 5, characterized in that: The filter screen (31) and the partition plate (32) together form the air supply channel (4), and a plurality of the circulation pipes (5) are evenly arranged horizontally in the air supply channel (4).

7. The dual-circuit heat exchanger according to claim 1, characterized in that: A transition cavity (6) is provided at the connection between the circulation pipeline (5) and the liquid inlet (1) and the liquid outlet (2); the transition cavity (6) has an inner diameter greater than that of the circulation pipeline (5).

8. The dual-circuit heat exchanger according to claim 7, characterized in that: The pipeline ports of the circulation pipelines (5) at the same position are connected to the same transition chamber (6), and the transition chamber (6) is also provided with an oil-seepage flange.

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