Heat recovery device for powder spraying workpiece

Abstract

The utility model relates to a heat recovery device for a powder spraying workpiece. The heat recovery device comprises a heat preservation chamber and an exhaust pipeline communicated with the heat preservation chamber. The system further comprises a heat exchange water tank, a heat recovery cavity and a first fin coil pipe arranged in the heat recovery cavity, the heat recovery cavity is arranged between the exhaust pipeline and the heat preservation chamber, and a second fin coil pipe connected with the first fin coil pipe is arranged in the heat exchange water tank. And liquid in the first finned coil pipe and the second finned coil pipe circularly flows. Hot air in the heat preservation chamber flows through the heat recovery cavity and then enters the exhaust pipeline, heat exchange is conducted between the hot air and liquid in the first fin coil pipe, and heat exchange is conducted between water in the heat exchange water tank and liquid in the second fin coil pipe. Through the arrangement of the first fin coil pipe and the second fin coil pipe, part of heat is recovered in the cooling process of a high-temperature workpiece after powder spraying.

Description

Technical Field

[0001] The utility model relates to the field of spray cooling devices, in particular to a heat recovery device for powder spraying workpieces. Background Art

[0002] Powder coating is currently a common process for spraying and coloring workpieces. Powder coating involves applying powder coating to the workpiece surface using a powder spraying machine. Under the influence of static electricity, the powder is evenly adsorbed onto the surface, forming a powdery coating. This powder coating undergoes high-temperature baking, leveling, and curing, resulting in a final coating with varying finishes. Powder coating offers superior mechanical strength, adhesion, corrosion resistance, and aging resistance to spray painting.

[0003] At present, during the powder spraying process, the workpiece is baked at a high temperature of generally 180°C to 200°C. After high temperature baking, the workpiece is cooled to room temperature by strong wind.

[0004] However, during the strong wind cooling process of the workpiece, the heat carried away by the strong wind is eventually discharged into the atmosphere, resulting in waste of heat energy. Utility Model Content

[0005] In view of the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a heat recovery device for powder spraying workpieces, which can recover the heat energy wasted during the cooling process of the powder spraying process.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A heat recovery device for powder spraying workpieces, comprising an insulation chamber and an exhaust duct connected to the insulation chamber, wherein the insulation chamber is used to accommodate high-temperature workpieces after powder spraying and baking; further comprising a heat exchange water tank, a heat recovery chamber and a first fin coil arranged in the heat recovery chamber, wherein the heat recovery chamber is arranged between the exhaust duct and the insulation chamber, and the heat exchange water tank is provided with a second fin coil connected to the first fin coil, and the liquid in the first fin coil and the second fin coil circulates; the hot air in the insulation chamber flows through the heat recovery chamber and then enters the exhaust duct, and the hot air exchanges heat with the liquid in the first fin coil, and the water in the heat exchange water tank exchanges heat with the liquid in the second fin coil.

[0008] Furthermore, an air shower nozzle and an atomizing nozzle are provided on the side wall of the insulation chamber. There are a plurality of the air shower nozzles and the atomizing nozzles, and one atomizing nozzle is provided between two adjacent air shower nozzles.

[0009] Furthermore, a filter is provided between the insulation chamber and the heat recovery chamber.

[0010] Furthermore, an expansion tank is provided on the connecting pipeline between the first finned coil and the second finned coil.

[0011] Furthermore, it also includes a cleaning mechanism for cleaning the outer surface of the first fin coil, the cleaning mechanism includes a cleaning water tank, a second water pump connected to the cleaning water tank, a water spraying tank connected to the output end of the second water pump, and a water receiving tray arranged below the first fin coil, the water spraying tank is arranged above the first fin coil, and the water receiving tray is connected to the cleaning water tank.

[0012] Furthermore, a drain pipe is connected between the water receiving tray and the cleaning water tank, and a filter is provided in the drain pipe.

[0013] Furthermore, a bypass pipe is provided, which includes a bent pipe and a water pipe. One end of the bent pipe is connected to the drain pipe located between the water receiving tray and the filter, and the other end of the bent pipe is connected to the water pipe. The water pipe is connected to the cleaning water tank, the drain pipe is arranged along the height direction, and the bent pipe is bent upward along the height direction.

[0014] Furthermore, a water flow detection sensor is provided on the water pipe.

[0015] Furthermore, the two ends of the first fin coil are respectively connected to a water inlet manifold and a water outlet manifold, the water inlet manifold is connected to the water outlet of the second fin coil, the water outlet manifold is connected to the water inlet of the second fin coil, and a first water pump is connected between the water inlet manifold and the water outlet of the second fin coil.

[0016] Furthermore, there are more than two first fin coils, and the first fin coils are arranged at equal intervals around the high-temperature workpiece.

[0017] Compared with the prior art, the beneficial effect of the present invention is that, by disposing the first finned coil and the second finned coil, the present invention recovers part of the heat of the high-temperature workpiece after powder spraying during the cooling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a heat recovery device for powder coating workpieces of the present invention;

[0019] Figure 2 This is a schematic diagram of the side wall of the insulation chamber of the present utility model;

[0020] Figure 3 yes Figure 2 Enlarged schematic diagram of part A in the middle.

[0021] In the picture:

[0022] 1-Insulation chamber; 2-Exhaust duct; 3-High-temperature workpiece; 4-Heat exchange water tank; 5-Heat recovery chamber; 6-First finned coil; 7-Second finned coil; 8-Air shower nozzle; 9-Atomizing nozzle; 10-Filter; 11-Expansion tank; 12-Cleaning water tank; 13-Second water pump; 14-Spray tank; 15-Water receiving tray; 16-First water pump. DETAILED DESCRIPTION

[0023] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0024] 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 positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on 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.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] The utility model discloses a heat recovery device for a powder spraying workpiece, which is used for cooling a high-temperature workpiece after powder spraying and high-temperature baking and leveling and solidification, and recovering part of the heat emitted by the high-temperature workpiece.

[0027] like Figure 1As shown, the heat recovery device for powder-coated workpieces includes an insulation chamber 1 and an exhaust duct 2 connected to the insulation chamber 1. The insulation chamber 1 is used to accommodate the high-temperature workpiece 3 after powder spraying and baking. Specifically, the high-temperature workpiece 3 is suspended in the insulation chamber 1 via a sling. The heat recovery device for powder-coated workpieces also includes a heat exchange water tank 4, a heat recovery chamber 5, and a first fin coil 6 arranged in the heat recovery chamber 5. The heat recovery chamber 5 is arranged between the exhaust duct 2 and the insulation chamber 1. The heat exchange water tank 4 is provided with a second fin coil 7 connected to the first fin coil 6. The liquid in the first fin coil 6 and the second fin coil 7 circulates. The hot air in the insulation chamber 1 flows through the heat recovery chamber 5 and then enters the exhaust duct 2. The hot air exchanges heat with the liquid in the first fin coil 6, and the water in the heat exchange water tank 4 exchanges heat with the liquid in the second fin coil 7.

[0028] Before use, the heat recovery device for powder-coated workpieces has the water in the heat exchange water tank 4 and the liquid in the first fin coil 6 and the second fin coil 7 at relatively low temperatures. After the high-temperature workpiece 3 is placed in the insulation chamber 1, the heat emitted by the high-temperature workpiece 3 is heat-exchanged with the cold liquid in the first fin coil 6. Subsequently, the hot liquid in the first fin coil 6 circulates into the second fin coil 7. The hot liquid in the second fin coil 7 is heat-exchanged with the cold water in the heat exchange water tank 4. The cold water in the heat exchange water tank 4 is converted into hot water for bathing by the staff. The utility model, through the arrangement of the first fin coil 6 and the second fin coil 7, recovers part of the heat emitted by the high-temperature workpiece 3 during the cooling process after powder coating.

[0029] like Figures 1 to 3As shown, in this embodiment, an air shower nozzle 8 and an atomizing nozzle 9 are provided on the side wall of the insulation chamber 1, and a plurality of the air shower nozzles 8 and the atomizing nozzle 9 are provided, and an atomizing nozzle 9 is provided between two adjacent air shower nozzles 8. The wind source of the air shower nozzle 8 comes from an external blower, and the atomized water vapor of the atomizing nozzle 9 comes from an atomizer. The atomized water vapor is a droplet of tiny particles, which is fully mixed with the wind sprayed from the air shower nozzle 8 and then fully exchanges heat with the surface of the high-temperature workpiece 3. The utility model provides an air shower nozzle 8 on the side wall of the insulation chamber 1, so that the high-temperature workpiece 3 can be cooled by strong wind, and by providing an atomizing nozzle 9 on the side wall of the insulation chamber 1, the air shower nozzle 8 sprays strong wind and the atomizing nozzle 9 sprays atomized water vapor simultaneously, thereby ensuring the air humidity in the insulation chamber 1 and facilitating heat exchange with the high-temperature workpiece 3. If the water mist from the atomizer is first mixed with air before being ejected through the air shower nozzles 8, the actual dry air circulation volume will be too low, affecting heat exchange. Because the density of moist air is lower than that of dry air, the mass flow rate of the actual circulating dry air is too low, and the air can accommodate less water vapor, reducing the cooling efficiency of the high-temperature workpiece 3. In other embodiments, the air shower nozzles 8 that eject strong air and the atomizing nozzles 9 can also be arranged in sequence and spaced apart.

[0030] The main working steps of the heat recovery device for powder spraying workpieces of the utility model are as follows:

[0031] S1, hanging the high-temperature workpiece 3 in the insulation chamber 1, at which time the temperature of the high-temperature workpiece 3 is about 180°C.

[0032] In step S2, the air shower nozzle 8 simultaneously emits strong air, while the atomizing nozzle 9 sprays atomized water vapor. Under the disturbance and mixing of the strong air, the air and atomized water vapor flow together toward the high-temperature workpiece 3, effectively exchanging heat with the workpiece 3. Heat from the high-temperature workpiece 3 is absorbed by the air and atomized droplets, raising the air temperature within the insulation chamber 1 to approximately 90°C. The atomized droplets evaporate into water vapor due to the heat. The approximately 90°C air within the insulation chamber 1 mixes with the water vapor, forming humid air with a relative humidity of 50% to 60%.

[0033] In step S3, moist air with a relative humidity of 50% to 60% and a temperature of approximately 90°C enters the heat recovery chamber 5 and undergoes heat exchange with the first fin coil 6. The approximately 90°C moist air is cooled to approximately 75°C and then discharged into the atmosphere through the exhaust duct 2. Simultaneously, the approximately 15°C liquid within the first and second fin coils 6 and 7 is continuously heated to approximately 70°C through heat exchange with the approximately 90°C moist air via the first fin coil 6. Subsequently, the approximately 70°C liquid in the second fin coil 7 undergoes heat exchange with the cold water in the heat exchange water tank 4, heating the cold water in the heat exchange water tank 4 to approximately 65°C. The approximately 65°C hot water can be used for showering and bathing by staff.

[0034] like Figure 1 and Figure 2 As shown, in this embodiment, a filter 10 is provided between the heat preservation chamber 1 and the heat recovery chamber 5. By providing the filter 10, the present invention reduces the amount of dust introduced into the heat recovery chamber 5 by the hot and humid air during the cooling process of the high-temperature workpiece 3, thereby reducing the amount of dust accumulated on the first fin coil 6. In other embodiments, to reduce the manufacturing cost of the heat recovery device for powder coating workpieces, the filter 10 may not be provided between the heat preservation chamber 1 and the heat recovery chamber 5.

[0035] like Figure 1 As shown, in this embodiment, an expansion tank 11 is provided on the connecting pipe between the first fin coil 6 and the second fin coil 7. The function of the expansion tank 11 is to prevent the liquid in the first fin coil 6 and the second fin coil 7 from decreasing in density due to temperature rise, thereby increasing in volume and causing the connecting pipe between the first fin coil 6 and the second fin coil 7 to rupture. The present invention prevents the connecting pipe between the first fin coil 6 and the second fin coil 7 from rupturing by providing the expansion tank 11. In other embodiments, in order to reduce the manufacturing cost of the heat recovery device for powder coating workpieces, the expansion tank 11 may not be provided.

[0036] like Figure 1As shown, in this embodiment, the first fin coil 6 is connected to an inlet manifold and an outlet manifold at both ends. After the liquid enters the inlet manifold, it is distributed to each fin of the first fin coil 6 and finally collected again in the outlet manifold. The inlet manifold is connected to the outlet of the second fin coil 7, and the outlet manifold is connected to the inlet of the second fin coil 7. A first water pump 16 is connected between the inlet manifold and the outlet of the second fin coil 7. The provision of the first water pump 16, the inlet manifold, and the outlet manifold in the present invention reduces the diameter of the connecting pipe between the first fin coil 6 and the second fin coil 7, increases the liquid flow rate, and can quickly pump the liquid from the second fin coil 7 to the first fin coil 6. In other embodiments, not only are the inlet manifold and the outlet manifold connected to the two ends of the first fin coil 6, but the inlet manifold and the outlet manifold are also provided at both ends of the second fin coil 7.

[0037] like Figure 1 As shown, in this embodiment, at least two first fin coils 6 are provided, each of which is equally spaced around the high-temperature workpiece 3. More specifically, in this embodiment, two first fin coils 6 are provided, each of which is equally spaced around the high-temperature workpiece 3. By providing multiple first fin coils 6, the present invention improves the heat exchange rate with the hot and humid air. In other embodiments, the number of first fin coils 6 may also be four.

[0038] Although the filter 10 is provided in this embodiment, it is still impossible to prevent a small amount of fine dust from entering the heat recovery chamber 5. Over time, the dust will accumulate on the outer surface of the first fin coil 6. Figure 1As shown, in this embodiment, the heat recovery device for powder coating workpieces also includes a cleaning mechanism for cleaning the outer surface of the first fin coil 6. The cleaning mechanism includes a cleaning water tank 12, a second water pump 13 connected to the cleaning water tank 12, a water spraying tank 14 connected to the output end of the second water pump 13, and a water receiving tray 15 disposed below the first fin coil 6. The water spraying tank 14 is disposed above the first fin coil 6 and is connected to the cleaning water tank 12. When the first fin coil 6 needs to be cleaned, the high-temperature workpiece 3 is not cooled in the insulation chamber 1. The second water pump 13 pumps water from the cleaning water tank 12 into the water spraying tank 14, which evenly spreads water on the outer surface of the first fin coil 6. The water sprinkled on the outer surface of the first fin coil 6, together with dust, flows into the water receiving tray 15 under the influence of gravity and eventually returns to the cleaning water tank 12. Furthermore, during the heat exchange process between the hot and humid air and the liquid in the first finned coil 6, condensed water forms on the outer surface of the first finned coil 6. This condensed water also flows into the water receiving tray 15 due to gravity. The present invention achieves self-cleaning of the outer surface of the first finned coil 6 through the provision of the cleaning mechanism. In other embodiments, to reduce the manufacturing cost of the heat recovery device for powder coating workpieces, the cleaning mechanism may be omitted. When dust accumulates on the outer surface of the first finned coil 6, manual cleaning is performed.

[0039] like Figure 1 As shown, in this embodiment, a drain pipe is connected between the water receiving tray 15 and the cleaning water tank 12, and a filter is installed in the drain pipe. The filter is used to filter the wastewater used to clean dust from the outer surface of the first finned coil 6. By providing the filter, the water flowing from the water receiving tray 15 into the cleaning water tank 12 remains clean and reusable. In other embodiments, to reduce the manufacturing cost of the heat recovery device for powder coating workpieces, the filter may not be provided, but the water in the cleaning water tank 12 will need to be frequently replaced.

[0040] like Figure 1As shown, in this embodiment, the cleaning mechanism is further provided with a bypass pipe. The bypass pipe comprises a curved pipe and a water conduit. One end of the curved pipe communicates with the drain pipe located between the water receiving tray 15 and the filter, while the other end of the curved pipe communicates with the water conduit, which in turn communicates with the cleaning water tank 12. The drain pipe is arranged vertically, and the curved pipe bends upward in this direction. Because the curved pipe bends upward in this direction, when the filter is unobstructed, water flowing from the water receiving tray 15 returns to the cleaning water tank 12 via the drain pipe. If the filter is clogged, water flowing from the water receiving tray 15 flows into the cleaning water tank 12 via the bypass pipe. The provision of the bypass pipe in this utility model prevents the accumulation of wastewater in the water receiving tray 15 when the filter is clogged, or even prevents wastewater from overflowing from the water receiving tray 15 and contaminating other components. In other embodiments, to reduce the manufacturing cost of the heat recovery device for powder coating workpieces, the filter and bypass pipe may be omitted. In this case, the drainage pipes do not need to be arranged along the height direction.

[0041] In this embodiment, a water flow sensor can be installed in the water conduit. Once the water flow sensor detects water flow, the filter needs to be replaced. In other embodiments, the bypass pipe can be omitted, and water flow sensors can be installed in the drainage pipes on both sides of the filter. If only one water flow sensor detects water flow, or if the flow rates of the two water flow sensors differ significantly, the filter needs to be replaced. Alternatively, the water flow sensor can be omitted from the water conduit, and the flow of water from the conduit can be visually observed.

[0042] In summary, the present invention, through the provision of the first finned coil 6 and the second finned coil 7, recovers some of the heat dissipated from the high-temperature workpiece 3 during the cooling process after powder coating. Furthermore, the air shower nozzle 8 and the atomizing nozzle 9 provided on the sidewalls of the insulation chamber 1 ensure the humidity of the air within the insulation chamber 1. Furthermore, the filter 10 reduces the amount of dust entering the heat recovery chamber 5 during the cooling of the high-temperature workpiece 3. Furthermore, the expansion tank 11 prevents the connecting pipe between the first finned coil 6 and the second finned coil 7 from bursting. Furthermore, the first water pump 16, the water inlet manifold, and the water outlet manifold enable rapid pumping of liquid from the second finned coil 7 to the first finned coil 6. Furthermore, the provision of multiple first finned coils 6 increases the heat exchange rate with the moist, hot air. Finally, the cleaning mechanism enables self-cleaning of the outer surface of the first finned coil 6. The filter ensures that the water flowing from the water receiving tray 15 into the washing water tank 12 remains clean. The bypass pipe prevents the accumulation of wastewater in the water receiving tray 15 when the filter becomes clogged. Furthermore, a water flow sensor installed in the water conduit quickly indicates when the filter needs to be replaced.

[0043] It should be emphasized that the above are only preferred embodiments of the present invention and do not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A heat recovery device for powder spraying workpieces, comprising a heat preservation chamber (1) and an exhaust duct (2) connected to the heat preservation chamber (1), wherein the heat preservation chamber (1) is used to accommodate high-temperature workpieces (3) after powder spraying and baking, characterized in that: The heat exchange chamber (4) further comprises a heat exchange water tank (4), a heat recovery chamber (5) and a first finned coil (6) arranged in the heat recovery chamber (5); the heat recovery chamber (5) is arranged between the exhaust pipe (2) and the heat preservation chamber (1); a second finned coil (7) connected to the first finned coil (6) is provided in the heat exchange water tank (4); liquid in the first finned coil (6) and the second finned coil (7) circulates; hot air in the heat preservation chamber (1) flows through the heat recovery chamber (5) and then enters the exhaust pipe (2); the hot air exchanges heat with the liquid in the first finned coil (6); and water in the heat exchange water tank (4) exchanges heat with the liquid in the second finned coil (7).

2. The heat recovery device for powder coating workpiece according to claim 1, characterized in that: An air shower nozzle (8) and an atomizing nozzle (9) are provided on the side wall of the insulation chamber (1). A plurality of the air shower nozzles (8) and the atomizing nozzles (9) are provided, and one atomizing nozzle (9) is provided between two adjacent air shower nozzles (8).

3. The heat recovery device for powder coating workpiece according to claim 1, characterized in that: A filter (10) is provided between the insulation chamber (1) and the heat recovery chamber (5).

4. The heat recovery device for powder spraying workpiece according to claim 1, characterized in that: An expansion tank (11) is provided on the connecting pipeline between the first finned coil (6) and the second finned coil (7).

5. The heat recovery device for powder coating workpiece according to claim 1, characterized in that: The invention also includes a cleaning mechanism for cleaning the outer surface of the first fin coil (6), the cleaning mechanism including a cleaning water tank (12), a second water pump (13) connected to the cleaning water tank (12), a water spraying tank (14) connected to the output end of the second water pump (13), and a water receiving tray (15) arranged below the first fin coil (6); the water spraying tank (14) is arranged above the first fin coil (6), and the water receiving tray (15) is connected to the cleaning water tank (12).

6. The heat recovery device for powder coating workpiece according to claim 5, characterized in that: A drainage pipe is connected between the water receiving tray (15) and the cleaning water tank (12), and a filter is provided in the drainage pipe.

7. The heat recovery device for powder coating workpiece according to claim 6, characterized in that: A bypass pipe is also provided, the bypass pipe comprising a bent pipe and a water guide pipe, one end of the bent pipe being connected to the drain pipe located between the water receiving tray (15) and the filter, the other end of the bent pipe being connected to the water guide pipe, the water guide pipe being connected to the cleaning water tank (12), the drain pipe being arranged in the height direction, and the bent pipe being bent upward in the height direction.

8. The heat recovery device for powder coating workpiece according to claim 7, characterized in that: A water flow detection sensor is provided on the water conduit.

9. The heat recovery device for powder coating workpiece according to claim 1, characterized in that: The first finned coil (6) is connected to a water inlet manifold and a water outlet manifold at both ends, the water inlet manifold is connected to the water outlet of the second finned coil (7), the water outlet manifold is connected to the water inlet of the second finned coil (7), and a first water pump (16) is connected between the water inlet manifold and the water outlet of the second finned coil (7).

10. The heat recovery device for powder coating workpiece according to claim 1, characterized in that: There are more than two first finned coils (6), and each of the first finned coils (6) is arranged at equal intervals around the high-temperature workpiece (3).

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