Hairpin type heat exchanger

Abstract

The invention provides a hairpin type heat exchanger and relates to the technical field of heat exchangers, the hairpin type heat exchanger comprises a U-shaped shell and a U-shaped inner pipe arranged in the U-shaped shell in a sleeved mode, the two ends of the U-shaped inner pipe both extend to the outside of the U-shaped shell, and the two ends of the U-shaped shell are fixed to the outer surface of the U-shaped inner pipe in a sealed mode through plugging plates respectively; the two ends of the U-shaped shell are fixedly communicated with a water inlet pipe and a water outlet pipe respectively, and the air outlet end of the U-shaped inner pipe is fixedly communicated with a thermosensitive adjusting valve. When the hairpin type heat exchanger recovers heat of chemical waste gas, the circulation speed of the chemical waste gas in the U-shaped inner pipe can be adjusted according to the temperature of the discharged chemical waste gas, so that the heat of the chemical waste gas can be effectively recovered, and the utilization rate of the heat of the chemical waste gas is increased.

Description

Technical Field

[0001] The invention relates to a heat exchanger, in particular to a hairpin type heat exchanger, belonging to the technical field of heat exchangers. Background Art

[0002] A heat exchanger is a device that transfers heat between two or more fluids at different temperatures, so that heat is transferred from a higher temperature fluid to a lower temperature fluid. This application is a hairpin heat exchanger, which is a U-shaped heat exchanger, and is a type of partition heat exchanger.

[0003] The hairpin heat exchanger has a simple structure, small flow resistance, and low manufacturing cost. It is mostly used for heat recovery of chemical waste gas. That is, in the process of treating chemical waste gas, the heat in the waste gas is transferred to the water circuit through the hairpin heat exchanger, so that the water is heated up for other production uses. However, the heat exchange efficiency of the hairpin heat exchanger is poor. Since the water temperature at the water inlet end of the hairpin heat exchanger is constantly changing due to the influence of the water source, the waste gas temperature at the air inlet end is also constantly changing. When the chemical waste gas temperature at the air inlet end is high and the water temperature at the water inlet end is high, the temperature of the chemical waste gas discharged through the air outlet end will also be high, which will result in the heat of the chemical waste gas cannot be effectively recovered, and affect the utilization rate of the heat of the chemical waste gas. Therefore, a hairpin heat exchanger is proposed herein. Summary of the invention

[0004] The present invention proposes a hairpin heat exchanger, which can adjust the flow speed of the chemical waste gas in a U-shaped inner tube according to the temperature of the discharged chemical waste gas when recovering the heat of the chemical waste gas, so that the heat of the chemical waste gas can be effectively recovered and the utilization rate of the heat of the chemical waste gas is improved.

[0005] The present invention is implemented through the following technical scheme: a hairpin type heat exchanger, including a U-shaped outer shell and a U-shaped inner tube sleeved inside the U-shaped outer shell, both ends of the U-shaped inner tube extend to the outside of the U-shaped outer shell, and the two ends of the U-shaped outer shell are sealed and fixed to the outer surface of the U-shaped inner tube through a sealing plate respectively.

[0006] Specifically, two ends of the U-shaped shell are respectively fixedly connected with a water inlet pipe and a water outlet pipe, and a connecting plate is fixedly provided in the middle of the U-shaped shell.

[0007] Furthermore, two spiral heat-conducting sheets are fixedly sleeved on the outer surface of the U-shaped inner tube, and the outer peripheries of the two spiral heat-conducting sheets are in contact with the inner wall of the U-shaped outer shell.

[0008] Furthermore, the outer surface of the U-shaped inner tube is rotatably connected to two impellers A, and the two impellers A are located between two spiral heat conducting plates.

[0009] Furthermore, a heat-conducting convex strip is fixedly provided on the inner wall of the U-shaped inner tube, a connecting frame is fixed on the inner wall of the U-shaped inner tube, and an impeller B is rotatably connected to the middle part of the connecting frame.

[0010] The air outlet end of the U-shaped inner tube is fixedly connected to a thermal regulating valve, and the thermal regulating valve includes a valve housing, an exhaust cavity connected to the air outlet end of the U-shaped inner tube is provided inside the valve housing, a heat conduction box is provided inside the exhaust cavity, and the top end of the heat conduction box is fixedly passed through the top wall of the valve housing and extends to the top of the valve housing.

[0011] The inner wall of the heat-conducting box is rotatably connected to an outer gear ring, a fixed column is fixed to the inner wall of the heat-conducting box, a heat expansion strip is fixed to the outer surface of the fixed column, the heat expansion strip is spirally linearly sleeved on the outside of the fixed column, and the heat expansion strip is located inside the outer gear ring, and a plurality of limit rods are rotatably connected to the inner wall of the heat-conducting box, and when the spirally linear heat expansion strip expands and contracts due to heat, the change in its pitch is reduced by the plurality of limit rods.

[0012] A clamping block is fixed to one end of the heat expansion strip away from the fixing column, a clamping groove is formed on the inner wall of the outer gear ring, and the clamping block is clamped in the inner part of the clamping groove.

[0013] A support plate A and a support plate B are fixed to the top surface of the valve housing, a rotating rod is rotatably connected between the support plate A and the support plate B, a driven gear meshing with an external gear ring is fixedly sleeved on the outer surface of the rotating rod, a hollow worm is fixedly sleeved on the outer surface of the rotating rod, a worm wheel, gear A and gear B are rotatably connected to the top surface of the valve housing, the worm wheel meshes with the hollow worm, a gear C is fixedly sleeved on the central axis of the worm wheel, the gear A meshes with gear C and gear B respectively, and the rotating shaft of the gear B passes through the interior of the exhaust chamber and is fixedly connected to a baffle.

[0014] Furthermore, a sealing cover is installed on the top surface of the valve housing, and heat transfer oil is also provided inside the heat transfer box.

[0015] The present invention provides a hairpin heat exchanger, which has the following beneficial effects: The hairpin heat exchanger, when recovering the heat of chemical waste gas, is connected to a thermosensitive regulating valve fixedly connected to the outlet end of the U-shaped inner tube. When the chemical waste gas flows out through the thermosensitive regulating valve, the temperature of the heat expansion strip in the thermosensitive regulating valve changes with the temperature of the chemical waste gas, and it will stretch or shorten as its own temperature changes, and push the outer gear ring to rotate, and the outer gear ring drives the baffle to rotate together, so that the angle of the baffle in the exhaust chamber can be adjusted to adjust the flow gap of the chemical waste gas in the exhaust chamber, and then adjust the flow speed of the chemical waste gas in the U-shaped inner tube. That is to say, when the temperature of the chemical waste gas at the outlet end of the U-shaped inner tube is high, the temperature of the heat conduction box and the heat expansion strip rises, and the heat expansion strip becomes longer, so as to push the outer gear ring to rotate clockwise, so that the baffle rotates counterclockwise by a certain angle, so that the flow gap of the chemical waste gas in the exhaust chamber can be reduced, so that the flow speed of the chemical waste gas in the U-shaped inner tube can be reduced, and the heat exchange time of the chemical waste gas can be improved, so that the heat of the chemical waste gas can be effectively recovered, and the utilization rate of the heat of the chemical waste gas can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a front cross-sectional view of the internal structure of the U-shaped outer shell and the U-shaped inner tube in the present invention; Figure 3 It is a schematic diagram of the internal structure of the U-shaped housing in the present invention; Figure 4 It is a three-dimensional cross-sectional view of the internal structure of the U-shaped outer shell and the U-shaped inner tube in the present invention; Figure 5 For the present invention Figure 4 A magnified view of the structure at center A; Figure 6 It is a schematic diagram of the split structure of the thermal control valve in the present invention; Figure 7 It is a schematic diagram of the top surface structure of the thermal control valve in the present invention; Figure 8 It is a schematic diagram of the cross-sectional structure of the thermal control valve in the present invention; Fig. 9 It is a schematic diagram of the front cross-section structure of the medium thermal-sensitive regulating valve of the present invention; Fig.10 An exploded view of the internal structure of the thermal control valve of the present invention; Fig.11 It is an exploded view of the internal structure of the heat conduction box in the present invention.

[0017] Description of Reference Numerals 1. U-shaped housing; 101. blocking plate; 102. water inlet pipe; 103. water outlet pipe; 104. connecting plate; 2. U-shaped inner tube; 201. spiral heat conducting sheet; 202. impeller A; 203. heat conducting convex strip; 204. connecting frame; 205. impeller B; 3. Thermosensitive regulating valve; 301. Valve housing; 302. Exhaust chamber; 303, heat conduction box; 3031, outer gear ring; 3032, fixing column; 3033, thermal expansion strip; 3034, limiting rod; 3035, clamping block; 3036, clamping slot; 304, support plate A; 305, support plate B; 306, rotating rod; 307, driven gear; 308, hollow worm; 309, worm gear; 3091, gear C; 310. Gear A; 311. Gear B; 312. Baffle; 313. Sealing cover. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0019] See also Figures 1 to 11 The embodiment of the present invention provides a hairpin heat exchanger, comprising a U-shaped outer shell 1 and a U-shaped inner tube 2 sleeved inside the U-shaped outer shell 1, both ends of the U-shaped inner tube 2 extend to the outside of the U-shaped outer shell 1, and both ends of the U-shaped outer shell 1 are sealed and fixed to the outer surface of the U-shaped inner tube 2 through a sealing plate 101. Please refer to Figure 1 and Figure 4 The chemical waste gas passes through an external air pump or fan, flows into the inner cavity of the U-shaped inner tube 2 through the air inlet end at the top of the U-shaped inner tube 2, transfers the heat to the U-shaped inner tube 2, and then flows out through the air outlet end at the bottom of the U-shaped inner tube 2.

[0020] Please refer to Figure 1 to Figure 4 As a specific solution, the two ends of the U-shaped shell 1 are respectively fixedly connected with a water inlet pipe 102 and a water outlet pipe 103, and a connecting plate 104 is fixed in the middle of the U-shaped shell 1. The water source is driven by an external water pump, flows into the interior of the U-shaped shell 1 through the water inlet pipe 102, absorbs the heat of the U-shaped inner tube 2, and then flows out through the water outlet pipe 103 to realize the wall-type heat exchange process between water and chemical waste gas.

[0021] Please refer to Figure 2 to Figure 5As a further solution, two spiral heat conducting sheets 201 are fixedly sleeved on the outer surface of the U-shaped inner tube 2, and the outer peripheries of the two spiral heat conducting sheets 201 are in contact with the inner wall of the U-shaped outer shell 1. The spiral heat conducting sheets 201 can make water flow around the outer surface of the U-shaped inner tube 2 inside the U-shaped outer shell 1, forming a rotating flow state, ensuring uniform heating of the water and improving heat exchange efficiency.

[0022] The outer surface of the U-shaped inner tube 2 is rotatably connected to two impellers A202, and the two impellers A202 are located between the two spiral heat conducting fins 201. The impellers A202 are driven to rotate by the power of the water flow to stir the water flow, further ensuring uniform heating of the water and improving the heat exchange efficiency.

[0023] The inner wall of the U-shaped inner tube 2 is fixedly provided with heat-conducting convex strips 203 to increase the heat-conducting area between the exhaust gas and the U-shaped inner tube 2. A connecting frame 204 is fixedly provided on the inner wall of the U-shaped inner tube 2. The middle part of the connecting frame 204 is rotatably connected with an impeller B205. The impeller B205 is rotated by the power of the chemical waste gas to stir the chemical waste gas, thereby increasing the heat exchange rate between the chemical waste gas and the U-shaped inner tube 2, and further increasing the heat exchange efficiency between the chemical waste gas and the water flow.

[0024] The above-mentioned U-shaped inner tube 2, spiral heat conductive sheet 201, heat conductive convex strip 203, connecting frame 204 and impeller B205 are all made of metal materials with good heat conductive effect, and anti-corrosion treatment is performed according to conventional requirements.

[0025] Please refer to Figure 1 The outlet end of the U-shaped inner tube 2 is fixedly connected with a thermal regulating valve 3, which includes a valve housing 301. The valve housing 301 is provided with an exhaust cavity 302 connected with the outlet end of the U-shaped inner tube 2. A heat-conducting box 303 is provided inside the exhaust cavity 302. The top of the heat-conducting box 303 is fixedly passed through the top wall of the valve housing 301 and extends to the top of the valve housing 301. The heat-conducting box 303 is made of a metal material with good thermal conductivity, and an anti-corrosion coating is provided on its outer surface. When the chemical waste gas is discharged into the exhaust cavity 302 through the outlet end of the U-shaped inner tube 2, it can exchange heat with the heat-conducting box 303, so that the temperature of the heat-conducting box 303 changes with the temperature of the chemical waste gas.

[0026] Please refer to Figure 6 to Figure 11The inner wall of the heat-conducting box 303 is rotatably connected with an outer toothed ring 3031, a fixed column 3032 is fixed to the inner wall of the heat-conducting box 303, a heat expansion strip 3033 is fixed to the outer surface of the fixed column 3032, and the heat expansion strip 3033 is spirally sleeved on the outside of the fixed column 3032, and the heat expansion strip 3033 is located inside the outer toothed ring 3031. Among them, the heat expansion strip 3033 can be made of an alloy material with a high thermal expansion coefficient, such as Cu60Zn40 copper-zinc alloy. When the temperature of the heat-conducting box 303 changes with the temperature of the chemical waste gas, the temperature of the heat expansion strip 3033 will also change, and it will stretch or shorten as its own temperature changes.

[0027] A plurality of limiting rods 3034 are rotatably connected to the inner wall of the heat-conducting box 303 . When the spiral-shaped heat expansion strip 3033 is in a process of thermal expansion and contraction, the plurality of limiting rods 3034 are used to reduce the change in the pitch thereof.

[0028] Please refer to Figures 9 to 11 A clamping block 3035 is fixed to one end of the heat expansion strip 3033 away from the fixing column 3032, and a clamping groove 3036 is provided on the inner wall of the outer gear ring 3031, and the clamping block 3035 is clamped in the inner part of the clamping groove 3036. When the heat expansion strip 3033 will extend or shorten as its own temperature changes, it can push the outer gear ring 3031 to rotate.

[0029] A support plate A304 and a support plate B305 are fixed to the top surface of the valve housing 301, a rotating rod 306 is rotatably connected between the support plate A304 and the support plate B305, a driven gear 307 meshing with the outer gear ring 3031 is fixedly sleeved on the outer surface of the rotating rod 306, a hollow worm 308 is fixedly sleeved on the outer surface of the rotating rod 306, a worm wheel 309, a gear A310 and a gear B311 are rotatably connected to the top surface of the valve housing 301, the worm wheel 309 meshes with the hollow worm 308, a gear C3091 is fixedly sleeved on the central axis of the worm wheel 309, the gear A310 meshes with the gear C3091 and the gear B311 respectively, the rotating shaft of the gear B311 passes through the interior of the exhaust chamber 302 and is fixedly connected to a baffle 312.

[0030] When the heat expansion strip 3033 will stretch or shorten as its own temperature changes and push the outer gear ring 3031 to rotate, it can drive the hollow worm 308 to rotate through the driven gear 307, and the hollow worm 308 drives the worm wheel 309, gear C3091, gear A310, gear B311 and baffle 312 to rotate together, so as to adjust the angle of the baffle 312 in the exhaust chamber 302 to adjust the flow gap of the chemical waste gas in the exhaust chamber 302, and then adjust the flow speed of the chemical waste gas in the U-shaped inner tube 2. That is to say, when the temperature of the chemical waste gas at the outlet end of the U-shaped inner tube 2 is high, the temperature of the heat conduction box 303 and the heat expansion strip 3033 increases, and the heat expansion strip 3033 becomes longer to promote the outer gear ring 3031 to rotate clockwise, so that the baffle 312 rotates counterclockwise by a certain angle, which can make the flow gap of the chemical waste gas in the exhaust chamber 302 smaller, so that the flow speed of the chemical waste gas in the U-shaped inner tube 2 is reduced, and the heat exchange time of the chemical waste gas is increased, so that the heat of the chemical waste gas can be effectively recovered, and the utilization rate of the heat of the chemical waste gas is improved; conversely, when the temperature of the chemical waste gas at the outlet end of the U-shaped inner tube 2 is low, the baffle 312 can rotate clockwise to increase the flow speed of the chemical waste gas in the U-shaped inner tube 2, thereby ensuring the normal processing speed of the chemical waste gas.

[0031] In addition, in the above scheme, through the transmission design of the hollow worm 308 and the worm wheel 309, one-way transmission between the outer gear ring 3031 and the baffle 312 can be achieved, that is, the outer gear ring 3031 can drive the baffle 312 to rotate, while the baffle 312 cannot drive the outer gear ring 3031 to rotate, so as to avoid the baffle 312 from rotating arbitrarily due to the thrust of chemical waste gas in the exhaust chamber 302.

[0032] As a further solution, a sealing cover 313 is installed on the top surface of the valve housing 301 to prevent the transmission components on the valve housing 301 from being corroded. Heat transfer oil is also provided inside the heat transfer box 303 to ensure the heat transfer effect between the chemical waste gas, the heat transfer box 303 and the thermal expansion strip 3033, which is conducive to the temperature of the thermal expansion strip 3033 changing with the temperature of the chemical waste gas.

[0033] The working principle has been shown above. It should be noted that as the temperature of the chemical waste gas in the exhaust chamber 302 changes, the thermal expansion strip 3033 will extend or shorten to drive the baffle 312 to rotate. In the actual implementation process, the rotation angle of the baffle 312 can be adjusted according to the thermal expansion coefficient of the thermal expansion strip 3033 and the gear ratio between the outer gear ring 3031, the driven gear 307, the gear C3091 and the gear B311. The specific setting needs to be combined with the implementation spirit of this application and related test data to achieve the implementation purpose of this application.

[0034] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A hairpin heat exchanger, comprising a U-shaped outer shell (1) and a U-shaped inner tube (2) sleeved inside the U-shaped outer shell (1), both ends of the U-shaped inner tube (2) extending to the outside of the U-shaped outer shell (1), and both ends of the U-shaped outer shell (1) being sealed and fixed to the outer surface of the U-shaped inner tube (2) via a sealing plate (101), characterized in that: The outlet end of the U-shaped inner tube (2) is fixedly connected to a thermal regulating valve (3), the thermal regulating valve (3) comprising a valve housing (301), an exhaust cavity (302) connected to the outlet end of the U-shaped inner tube (2) is provided inside the valve housing (301), a heat conduction box (303) is provided inside the exhaust cavity (302), the top end of the heat conduction box (303) is fixedly passed through the top wall of the valve housing (301) and extends to the top of the valve housing (301); The inner wall of the heat-conducting box (303) is rotatably connected to an outer toothed ring (3031), a fixed column (3032) is fixed to the inner wall of the heat-conducting box (303), a heat expansion strip (3033) is fixed to the outer surface of the fixed column (3032), the heat expansion strip (3033) is spirally linearly sleeved on the outside of the fixed column (3032), and the heat expansion strip (3033) is located inside the outer toothed ring (3031), and a plurality of limiting rods (3034) are rotatably connected to the inner wall of the heat-conducting box (303), and when the spirally linear heat expansion strip (3033) is in a process of thermal expansion and contraction, the plurality of limiting rods (3034) are used to reduce the change in the pitch of the spirally linear heat expansion strip (3033); A clamping block (3035) is fixed to one end of the heat expansion strip (3033) away from the fixing column (3032); a clamping groove (3036) is provided on the inner wall of the outer gear ring (3031); and the clamping block (3035) is clamped inside the clamping groove (3036); A support plate A (304) and a support plate B (305) are fixed to the top surface of the valve housing (301); a rotating rod (306) is rotatably connected between the support plate A (304) and the support plate B (305); a driven gear (307) meshing with the outer gear ring (3031) is fixedly sleeved on the outer surface of the rotating rod (306); a hollow worm (308) is fixedly sleeved on the outer surface of the rotating rod (306); and the top surface of the valve housing (301) is rotatably connected to the rotating rod (306). A worm wheel (309), a gear A (310) and a gear B (311) are provided. The worm wheel (309) is meshed with the hollow worm (308). A gear C (3091) is fixedly sleeved on the central axis of the worm wheel (309). The gear A (310) is meshed with the gear C (3091) and the gear B (311) respectively. The rotating shaft of the gear B (311) passes through the interior of the exhaust chamber (302) and is fixedly connected to a baffle (312).

2. A hairpin heat exchanger according to claim 1, characterized in that: The two ends of the U-shaped shell (1) are respectively fixedly connected with a water inlet pipe (102) and a water outlet pipe (103), and the middle part of the U-shaped shell (1) is fixed with a connecting plate (104).

3. The hairpin heat exchanger according to claim 1, characterized in that: The outer surface of the U-shaped inner tube (2) is fixedly sleeved with two spiral heat-conducting sheets (201), and the outer peripheries of the two spiral heat-conducting sheets (201) are in contact with the inner wall of the U-shaped outer shell (1).

4. A hairpin heat exchanger according to claim 3, characterized in that: The outer surface of the U-shaped inner tube (2) is rotatably connected to two impellers A (202), and the two impellers A (202) are both located between the two spiral heat conducting fins (201).

5. The hairpin heat exchanger according to claim 1, characterized in that: The inner wall of the U-shaped inner tube (2) is fixedly provided with a heat-conducting convex strip (203), the inner wall of the U-shaped inner tube (2) is fixedly provided with a connecting frame (204), and the middle part of the connecting frame (204) is rotatably connected to an impeller B (205).

6. The hairpin heat exchanger according to claim 1, characterized in that: A sealing cover (313) is installed on the top surface of the valve housing (301), and heat transfer oil is also provided inside the heat transfer box (303).

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