Heat exchanger

Abstract

The utility model provides a heat exchanger, which relates to the technical field of heat exchangers, and comprises a first surface plate, a second surface plate, a gas-liquid separation chamber, a gas inlet pipe and a gas outlet pipe, a plurality of heat exchange pipes are arranged between the first surface plate and the second surface plate, and backflow heating pipe bodies are arranged above the heat exchange pipes and between the adjacent heat exchange pipes. Cooling pipe bodies are arranged on the lower portions of the heat exchange pipes and between the adjacent heat exchange pipes, the gas-liquid separation chambers are arranged on the side lower portions of the first surface plate and the second surface plate, and the gas inlet pipe, the heat exchange pipes and the gas-liquid separation chambers are communicated to form a hot fluid cooling channel. And the gas-liquid separation chamber, the backflow heating pipe body and the gas outlet pipe are communicated to form a cold fluid backflow heating channel. The heat exchanger has the advantages that the heat exchange tubes, the backflow heating tube body and the cooling tube body are all the integrally-formed flat tubes, aluminum plate-fin structures are replaced by the flat tubes, the strength is higher, the failure rate is reduced, the production process is simple, and the production efficiency can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to a heat exchanger. Background Technology

[0002] A heat exchanger is an energy-saving device that enables heat transfer between two or more fluids at different temperatures. It transfers heat from a higher-temperature fluid to a lower-temperature fluid, bringing the fluid temperature to the specified parameters of the process to meet the requirements of the process conditions. It is also one of the main devices for improving energy utilization efficiency.

[0003] Currently, there are numerous publicly available patents related to heat exchangers. For example, the technical solution of Chinese patent document (publication number: CN210108093U, patent name: A simplified plate-fin heat exchanger) discloses that it "includes a heat exchanger inlet, a heat exchange chamber, a gas-liquid separation chamber, and a heat exchanger outlet. The heat exchanger inlet and the heat exchanger outlet are respectively connected to independent flow chambers. The flow chambers are installed on both sides of the upper part of the heat exchange chamber and communicate with the heat exchange chamber. The heat exchange chamber includes a first heat exchange channel, a second heat exchange channel, and a third heat exchange channel. The first heat exchange channel is set separately on one side, and the second and third heat exchange channels are located on the other side. The second heat exchange channel communicates with the upper part of the gas-liquid separation chamber and the heat exchanger outlet, and the first heat exchange channel communicates with the lower part of the gas-liquid separation chamber and the heat exchanger inlet."

[0004] Based on the description and drawings in the patent document, the heat exchanger is an aluminum plate-fin heat exchanger. Aluminum plate-fin heat exchangers use a vacuum brazing furnace, which is a complex process with slow production speed. Moreover, the fins may deform or be damaged during continuous high-pressure operation, resulting in low structural strength. Utility Model Content

[0005] This invention overcomes the shortcomings of the prior art and provides a heat exchanger that replaces the aluminum plate-fin structure with a flat tube, which not only effectively improves the production efficiency of the heat exchanger, but also enhances the structural strength of the heat exchanger.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] A heat exchanger includes a first surface plate, a second surface plate, a gas-liquid separation chamber, an inlet pipe, and an outlet pipe. A plurality of heat exchange tubes are arranged between the first and second surface plates. A reflux heating tube is arranged between adjacent heat exchange tubes above the heat exchange tubes, and a cooling tube is arranged between adjacent heat exchange tubes below the heat exchange tubes. The gas-liquid separation chamber is located below the first and second surface plates. The inlet pipe, heat exchange tubes, and gas-liquid separation chamber are connected to form a hot fluid cooling channel, and the gas-liquid separation chamber, reflux heating tube, and outlet pipe are connected to form a cold fluid reflux heating channel.

[0008] Furthermore, several baffles are arranged inside the heat exchange tube, the reflux heating tube, and the cooling tube.

[0009] Furthermore, the reflux heating tube body includes a reflux straight pipe, a first bend pipe is provided above the reflux straight pipe, a second bend pipe is provided below the reflux straight pipe, a flow element is provided on the side of the first bend pipe, and a gas-liquid separation chamber is provided on the side of the second bend pipe.

[0010] Furthermore, the flow element extends upward at an angle to form a triangular shape, and the upper surface of the flow element is positioned below the air outlet pipe.

[0011] Furthermore, the gas-liquid separation chamber, the second bend pipe, the return straight pipe, the first bend pipe, the flow element, and the gas outlet pipe are connected together.

[0012] Furthermore, the gas-liquid separation chamber is formed by connecting a first chamber and a second chamber to form an L-shape. The first chamber is located below the heat exchange tube, and the second chamber is located on the side of the second bend tube.

[0013] Furthermore, a water outlet is connected to the lower part of the first cavity, and a drainage channel is provided inside the water outlet, which is connected to the first cavity.

[0014] Furthermore, the cooling pipe body includes a cooling straight pipe, a third bend pipe above the cooling straight pipe, a fourth bend pipe below the cooling straight pipe, a coolant outlet on the side of the third bend pipe, a coolant inlet on the side of the fourth bend pipe, and the coolant inlet is located below the coolant outlet.

[0015] Furthermore, the coolant inlet, the fourth bend pipe, the cooling straight pipe, the third bend pipe, and the coolant outlet are connected to form a coolant flow channel.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] The heat exchange tubes, reflux heating tubes, and cooling tubes are all made of one-piece flat tubes. By replacing the aluminum plate-fin structure with flat tubes, the strength is greater and the failure rate is reduced. Moreover, the flat tubes are welded together by continuous fiber welding. Compared with the vacuum brazing used in aluminum plate-fin structures, continuous fiber welding is more efficient and simpler in production process, which can effectively improve production efficiency. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and, together with the embodiments of the present invention, are used to explain the present invention. They do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is the overall heat exchanger of this utility model embodiment. Figure 1 ;

[0020] Figure 2 This is the overall heat exchanger of this utility model embodiment. Figure 2 ;

[0021] Figure 3 This is a schematic diagram of the heat exchange tube and the reflux heating tube body according to an embodiment of the present utility model;

[0022] Figure 4 This is a schematic diagram of the heat exchange tube and cooling tube body according to an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the hot fluid cooling channel according to an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the cold fluid reflux heating channel and the coolant flow channel according to an embodiment of the present invention.

[0025] In the diagram: 1-Inlet pipe, 2-Outlet pipe, 3-Heat exchange pipe, 4-Second surface plate, 5-Recirculation heating pipe body, 501-Recirculation straight pipe, 502-First bend pipe, 503-Second bend pipe, 6-Cooling pipe body, 601-Cooling straight pipe, 602-Third bend pipe, 603-Fourth bend pipe, 7-Gas-liquid separation chamber, 701-First cavity, 702-Second cavity, 8-Water outlet, 801-Drainage channel, 9-Coolant outlet, 10-Coolant inlet, 11-Flow component, 12-First surface plate, 13-Baffle plate. Detailed Implementation

[0026] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0027] like Figures 1 to 2As shown, a heat exchanger includes a first surface plate 12, a second surface plate 4, a gas-liquid separation chamber 7, an inlet pipe 1, and an outlet pipe 2. A plurality of heat exchange tubes 3 are arranged between the first surface plate 12 and the second surface plate 4. Above the heat exchange tubes 3, a reflux heating pipe 5 is arranged between adjacent heat exchange tubes 3. Below the heat exchange tubes 3, a cooling pipe 6 is arranged between adjacent heat exchange tubes 3. The gas-liquid separation chamber 7 is located below and to the side of the first surface plate 12 and the second surface plate 4. The inlet pipe 1, the heat exchange tubes 3, and the gas-liquid separation chamber 2... The heat exchanger 7 is connected to form a hot fluid cooling channel, and the gas-liquid separation chamber 7, the reflux heating tube 5, and the outlet pipe 2 are connected to form a cold fluid reflux heating channel. The heat exchanger 3, the reflux heating tube 5, and the cooling tube 6 are all made of one-piece flat tubes. By replacing the aluminum plate-fin structure with flat tubes, the strength is greater and the failure rate is reduced. Moreover, the flat tubes are welded together by continuous fiber welding. Compared with the vacuum brazing used in the aluminum plate-fin structure, continuous fiber welding is more efficient and simpler in production process, which can effectively improve production efficiency.

[0028] Specifically, such as Figures 3 to 4 As shown, several baffles 13 are arranged inside the heat exchange tube 3, the reflux heating tube 5, and the cooling tube 6. The baffles 13 not only serve as a separator but also increase the heat exchange area, resulting in better gas heat exchange.

[0029] The reflux heating tube body 5 includes a reflux straight pipe 501, a first bend pipe 502 is provided above the reflux straight pipe 501, a second bend pipe 503 is provided below the reflux straight pipe 501, a flow element 11 is provided on the side of the first bend pipe 502, and a gas-liquid separation chamber 7 is provided on the side of the second bend pipe 503. The gas-liquid separation chamber 7, the second bend pipe 503, the reflux straight pipe 501, the first bend pipe 502, the flow element 11, and the gas outlet pipe 2 are connected. The gas-liquid separation chamber 7 is formed by connecting the first cavity 701 and the second cavity 702 to form an L-shape. The first cavity 701 is provided below the heat exchange tube 3, and the second cavity 702 is provided on the side of the second bend pipe 503. A water outlet 8 is connected below the first cavity 701, and a drainage channel 801 is provided in the water outlet 8. The drainage channel 801 is connected to the first cavity 701.

[0030] The flow element 11 extends upward at an angle to form a triangle. The upper surface of the flow element 11 is located below the gas outlet pipe 2. The triangular design can guide the gas. When the gas collides with the inclined surface of the flow element 11, it will bounce to the gas outlet pipe 2, thereby improving the gas outlet efficiency.

[0031] The cooling tube body 6 includes a cooling straight pipe 601, a third bend pipe 602 above the cooling straight pipe 601, and a fourth bend pipe 603 below the cooling straight pipe 601. A coolant outlet 9 is located on the side of the third bend pipe 602, and a coolant inlet 10 is located on the side of the fourth bend pipe 603. The coolant inlet 10 is located below the coolant outlet 9. The coolant inlet 10, the fourth bend pipe 603, the cooling straight pipe 601, the third bend pipe 602, and the coolant outlet 9 are connected to form a coolant flow channel. Coolant enters the fourth bend pipe 603 from the coolant inlet 10, then enters the third bend pipe 602 through the cooling straight pipe 601, and finally exits from the coolant outlet 9, so as to reduce the temperature of the coolant flow channel and keep the area below the heat exchange tube 3 in a low-temperature region.

[0032] In this embodiment, during the flow of the high-temperature compressed gas in the hot fluid cooling channel, it first undergoes primary cooling with the low-temperature gas entering the return heating pipe 5, and then undergoes secondary cooling with the refrigerant entering the coolant flow channel. This results in the gas entering the first chamber 701 from the heat exchange pipe 3 being a low-temperature gas with temperatures as low as a few degrees Celsius. The low-temperature gas easily causes water vapor to increase to a saturated state. The supersaturated water vapor tends to condense into liquid water, causing water to cool and precipitate to the bottom of the first chamber 701 and be discharged through the drain channel 801. The low-temperature gas that has discharged water then rises into the return heating pipe 5 in the second chamber 702, where it exchanges heat with the high-temperature compressed gas that has just entered the hot fluid cooling channel, thus raising the temperature of the low-temperature gas. The gas is heated to a suitable temperature and then discharged from the outlet pipe 2 through the flow element 11. Typically, the gas after the two-stage cooling process is around 2 to 5 degrees Celsius. This low temperature helps to release the moisture in the gas, making it dry. Since the final practical application does not require such a low-temperature gas, the gas needs to be heated before being output. Therefore, before being output, it will exchange heat with the high-temperature gas entering from the heat exchange tube 3 while flowing through the return heating tube 5, and its temperature will rise to around 20 to 30 degrees Celsius before being output. That is, at the point where the heat exchange tube 3 and the return heating tube 5 overlap, the low-temperature gas is heated, and the high-temperature gas also achieves the effect of the first-stage cooling, making effective use of heat. The design is ingenious.

[0033] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heat exchanger, characterized in that, The system includes a first surface plate (12), a second surface plate (4), a gas-liquid separation chamber (7), an inlet pipe (1), and an outlet pipe (2). Several heat exchange tubes (3) are arranged between the first surface plate (12) and the second surface plate (4). A reflux heating pipe body (5) is arranged between adjacent heat exchange tubes (3) above the heat exchange tubes (3). A cooling pipe body (6) is arranged between adjacent heat exchange tubes (3) below the heat exchange tubes (3). The gas-liquid separation chamber (7) is located below the first surface plate (12) and the second surface plate (4). The inlet pipe (1), the heat exchange tubes (3), and the gas-liquid separation chamber (7) are connected to form a hot fluid cooling channel. The gas-liquid separation chamber (7), the reflux heating pipe body (5), and the outlet pipe (2) are connected to form a cold fluid reflux heating channel.

2. The heat exchanger according to claim 1, characterized in that, Several baffles (13) are arranged inside the heat exchange tube (3), the reflux heating tube (5) and the cooling tube (6).

3. The heat exchanger according to claim 1, characterized in that, The reflux heating tube body (5) includes a reflux straight tube (501), a first bend tube (502) is provided above the reflux straight tube (501), a second bend tube (503) is provided below the reflux straight tube (501), a flow element (11) is provided on the side of the first bend tube (502), and a gas-liquid separation chamber (7) is provided on the side of the second bend tube (503).

4. The heat exchanger according to claim 3, characterized in that, The flow element (11) extends upward at an angle to form a triangular shape, and the upper surface of the flow element (11) is located below the air outlet pipe (2).

5. The heat exchanger according to claim 4, characterized in that, The gas-liquid separation chamber (7), the second turning pipe (503), the return straight pipe (501), the first turning pipe (502), the flow element (11), and the gas outlet pipe (2) are connected.

6. The heat exchanger according to claim 5, characterized in that, The gas-liquid separation chamber (7) is formed by connecting a first chamber (701) and a second chamber (702) to form an L-shape. The first chamber (701) is located below the heat exchange tube (3), and the second chamber (702) is located on the side of the second turning tube (503).

7. The heat exchanger according to claim 6, characterized in that, A water outlet (8) is connected to the bottom of the first cavity (701), and a drainage channel (801) is provided inside the water outlet (8), which is connected to the first cavity (701).

8. The heat exchanger according to claim 1, characterized in that, The cooling pipe body (6) includes a cooling straight pipe (601), a third bend pipe (602) is provided above the cooling straight pipe (601), a fourth bend pipe (603) is provided below the cooling straight pipe (601), a coolant outlet (9) is provided on the side of the third bend pipe (602), a coolant inlet (10) is provided on the side of the fourth bend pipe (603), and the coolant inlet (10) is located below the coolant outlet (9).

9. The heat exchanger according to claim 8, characterized in that, The coolant inlet (10), the fourth bend pipe (603), the cooling straight pipe (601), the third bend pipe (602), and the coolant outlet (9) are connected to form a coolant flow channel.

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