Hot air device for paint spray booth

Abstract

The utility model discloses a hot air device for a paint spray booth. A box body is internally provided with a filter bin, a first operation bin, a second operation bin and a third operation bin which are arranged independently; an air inlet communicated with the filtering bin and an air outlet communicated with the third operation bin are formed in the box body; a cross-flow heat exchanger is arranged in the first operation bin; an inlet of a first group of air ducts of the cross-flow heat exchanger is communicated with the filter bin, and an outlet is communicated with the second operation bin; an inlet of a second group of air ducts of the cross-flow heat exchanger is communicated with the second working bin, and an outlet is communicated with the third working bin; a paint mist filter is arranged in the filtering bin; the circulating heat exchange device comprises a compressor, an evaporator, a throttling device and an inner condenser which are sequentially connected to form a loop. According to the utility model, the return air exhausted from the spray booth can be filtered, dehumidified and heated, and the heat energy contained in the return air can be recycled. And dehumidification and heating treatment of return air are combined, so that exchange and utilization of energy are achieved, and the energy-saving effect is effectively achieved.

Description

Technical Field

[0001] This utility model relates to the field of spray painting technology, and in particular to a hot air device for spray painting booths. Background Technology

[0002] Spray booths are used for painting and coloring products. They typically require a constant temperature environment. Currently, this is achieved by heating outside fresh air and supplying it into the spray booth, while simultaneously exhausting recirculated air from inside the booth to form return air. However, return air contains a significant amount of heat, and direct emission results in the complete loss of this heat, leading to substantial energy waste. Furthermore, return air contains a large amount of volatile organic compounds (VOCs), and direct emission fails to meet environmental protection requirements. Additionally, the air inside the spray booth needs to maintain a certain level of dryness. If the air contains a large amount of moisture, this moisture will mix with the paint during the painting process. After drying, the moisture dissipates, affecting paint adhesion and potentially causing blistering. Therefore, dehumidification of the air entering the spray booth is necessary. Utility Model Content

[0003] To address the aforementioned technical problems, the purpose of this utility model is to propose a hot air device for spray booths, capable of filtering, dehumidifying, and heating the return air discharged from the spray booth, and recovering and reusing the heat energy contained in the return air. Furthermore, by combining dehumidification and heating of the return air, energy exchange and utilization are achieved, effectively realizing energy saving and demonstrating strong practicality.

[0004] The technical solution of this utility model is achieved as follows: a hot air device for a paint booth, including a housing and a circulating heat exchange device;

[0005] The housing contains independently arranged filter chambers, a first working chamber, a second working chamber, and a third working chamber; the housing is provided with an air inlet communicating with the filter chamber and an air outlet communicating with the third working chamber.

[0006] The first working chamber is equipped with a crossflow heat exchanger; the inlet of the first set of air ducts of the crossflow heat exchanger is connected to the filter chamber, and the outlet of the first set of air ducts is connected to the second working chamber; the inlet of the second set of air ducts of the crossflow heat exchanger is connected to the second working chamber, and the outlet of the second set of air ducts is connected to the third working chamber.

[0007] The filter chamber is equipped with a paint mist filter for filtering return air, located between the air inlet and the inlet of the first set of air ducts of the crossflow heat exchanger.

[0008] The circulating heat exchange device includes a compressor, an evaporator, a throttling device, and an internal condenser connected in sequence to form a loop; the evaporator is located in the second working chamber; and the internal condenser is located in the third working chamber.

[0009] Furthermore, the second working chamber is provided with a first air distribution plate; ventilation holes are distributed on the first air distribution plate; the first air distribution plate is provided between the outlet of the first set of air ducts of the crossflow heat exchanger and the evaporator, and between the inlet of the second set of air ducts of the crossflow heat exchanger and the evaporator.

[0010] Furthermore, a second air distribution plate is provided inside the third working chamber; ventilation holes are distributed on the second air distribution plate; the second air distribution plate is provided between the outlet of the second set of air ducts of the crossflow heat exchanger and the internal condenser.

[0011] Furthermore, the circulating heat exchange device includes an external condenser; the external condenser is located outside the housing; the inlet end of the external condenser is connected to the circuit between the compressor and the internal condenser; the outlet end of the external condenser is connected to the circuit between the throttling device and the internal condenser.

[0012] Furthermore, a water receiving tray is provided below the evaporator in the second working chamber; a drain pipe is connected to the water receiving tray; the drain pipe extends to the outside of the chamber.

[0013] Furthermore, the box contains an equipment compartment; the compressor is located within the equipment compartment.

[0014] Furthermore, the paint mist filter includes a primary filter and a secondary filter arranged sequentially on the return air conveying route; the secondary filter is a V-type filter.

[0015] Furthermore, the housing is equipped with doors for opening and closing the filter chamber, the first working chamber, the second working chamber, and the third working chamber.

[0016] Furthermore, the housing is equipped with temperature and humidity detectors for detecting the temperature and humidity inside the filter chamber, the first working chamber, the second working chamber, and the third working chamber; the temperature and humidity detectors have a value reading position exposed on the housing.

[0017] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0018] 1. This utility model utilizes a paint mist filter to filter volatile organic compounds in the return air discharged from the paint booth. Through the combined use of a cross-flow heat exchanger, the return air first enters the cross-flow heat exchanger for heat exchange and cooling, then enters the second working chamber for heat exchange with the evaporator, and is further cooled and dehumidified. The return air undergoes two cooling processes to thoroughly remove moisture. Simultaneously, the evaporator recovers the heat energy generated during the dehumidification of the return air and transfers it to the internal condenser. The cooled and dehumidified return air then undergoes heat exchange and heating again through the cross-flow heat exchanger and the internal condenser to achieve energy recovery and utilization. This combination of methods enables the filtration, dehumidification, and heating of the return air discharged from the paint booth, and the recovery and reuse of the heat energy contained in the return air. Furthermore, by combining the dehumidification and heating of the return air to achieve energy exchange and utilization, it effectively achieves energy-saving effects and is highly practical.

[0019] 2. By using the first and second air distribution plates in combination, this utility model can evenly disperse the return air in the second and third working chambers, so as to fully exchange heat with the evaporator and the internal condenser, making the return air dehumidification and heating treatment efficient and sufficient, effectively improving the quality of the generated hot air, and making it highly practical. Attached Figure Description

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings:

[0021] Figure 1 This is a three-dimensional structural diagram of the overall structure of this utility model;

[0022] Figure 2 for Figure 1 Internal structure diagram;

[0023] Figure 3 for Figure 2 A side view structural diagram;

[0024] Figure 4 for Figure 1 A three-dimensional structural diagram from another perspective;

[0025] The components include: 1. Housing; 11. First working compartment; 12. Second working compartment; 13. Third working compartment; 14. Filter compartment; 15. Air inlet; 16. Air outlet; 17. Equipment compartment; 2. Paint mist filter; 21. Primary filter; 22. Secondary filter; 3. Crossflow heat exchanger; 4. Evaporator; 41. Water collection tray; 5. Internal condenser; 51. External condenser; 6. Compressor; 7. First air distribution plate; 71. Second air distribution plate; 8. Temperature and humidity detector; 9. Door. Detailed Implementation

[0026] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0027] like Figure 1-4 The illustration shows a hot air device for a spray booth according to this embodiment. This hot air device is connected to the spray booth to receive the return air discharged from the spray booth and to supply hot air to the spray booth. The hot air device includes a housing 1 and a circulating heat exchange device. The housing 1 is a cuboid structure, including a frame structure and a sealing plate covering the frame structure. The interior of the housing 1 is divided into a filter chamber 14, a first working chamber 11, a second working chamber 12, and a third working chamber 13 by partitions. The filter chamber 14, first working chamber 11, second working chamber 12, and third working chamber 13 are all independent and sealed. An air inlet 15 communicating with the filter chamber 14 and an air outlet 16 communicating with the third working chamber 13 are machined on the side wall of the housing 1. The return air discharged from the spray booth can enter the filter chamber 14 through the air inlet 15, while the hot air can be discharged through the air outlet 16. A louvered structure is arranged on the air inlet 15.

[0028] In this embodiment, a crossflow heat exchanger 3 is installed in the first working chamber 11. This crossflow heat exchanger 3 is a conventional device in the prior art, having independent first and second sets of air ducts, both capable of heat exchange. The inlet of the first set of air ducts of the crossflow heat exchanger 3 is connected to the filter chamber 14, and the outlet is connected to the second working chamber 12. The inlet of the second set of air ducts of the crossflow heat exchanger 3 is connected to the second working chamber 12, and the outlet is connected to the third working chamber 13. The crossflow heat exchangers 3 connect the filter chamber 14, the second working chamber 12, and the third working chamber 13, forming an airflow channel for return air. A paint mist filter 2 for filtering return air is arranged in the filter chamber 14 between the air inlet 15 and the inlet of the first set of air ducts of the crossflow heat exchanger 3. As the return air flows from the air inlet 15 to the crossflow heat exchanger 3, the paint mist filter 2 filters out the volatile organic compounds in the return air, thereby effectively reducing the amount of paint residue entering the crossflow heat exchanger 3 and improving the service life of the crossflow heat exchanger 3.

[0029] The aforementioned paint mist filter 2 includes a primary filter 21 and a secondary filter 22 arranged sequentially along the return air conveying route. The secondary filter 22 is a V-type filter. This arrangement ensures thorough filtration of the return air and allows the primary filter 21 and secondary filter 22 to be independently disassembled and maintained, improving the convenience of maintenance and replacement.

[0030] The aforementioned circulating heat exchange device includes a compressor 6, an evaporator 4, a throttling device, an internal condenser 5, and an external condenser 51 connected in sequence to form a loop. The refrigerant circulates in the loop to exchange heat with the internal condenser 5 and the evaporator 4. The compressor 6, evaporator 4, throttling device, internal condenser 5, and external condenser 51 are all conventional components of the prior art. The throttling device is preferably an expansion valve, a technology of the prior art. The evaporator 4 is arranged in the second working chamber 12. The internal condenser 5 is arranged in the third working chamber 13. An equipment compartment 17 is arranged inside the housing 1. The compressor 6 is arranged in the equipment compartment 17.

[0031] The aforementioned external condenser 51 is located outside the housing 1. The inlet of the external condenser 51 is connected to the circuit between the compressor 6 and the internal condenser 5. The outlet of the external condenser 51 is connected to the circuit between the throttling device and the internal condenser 5. This connection method allows the external condenser 51 and the internal condenser 5 to be connected in parallel. When the temperature inside the third working chamber 13 is too high, the external condenser 51 can dissipate some heat to the outside of the housing 1, thereby maintaining the temperature stability of the third working chamber 13.

[0032] In this embodiment, the connection methods, working principles, and functional effects of the compressor 6, evaporator 4, throttling device, internal condenser 5, and external condenser 51 are all existing technologies and will not be elaborated further. For example, the function of the internal condenser 5 and the external condenser 51 is to discharge heat to the outside through the refrigerant.

[0033] A first air distribution plate 7 is arranged in the second working chamber 12. The first air distribution plate 7 has ventilation holes. It is installed between the outlet of the first set of air ducts of the cross-flow heat exchanger 3 and the evaporator 4, and between the inlet of the second set of air ducts of the cross-flow heat exchanger 3 and the evaporator 4. The use of the first air distribution plate 7 ensures that the return air is evenly dispersed, allowing for sufficient contact and heat exchange with the evaporator 4 and the cross-flow heat exchanger 3. A second air distribution plate 71 is arranged in the third working chamber 13. The second air distribution plate 71 has ventilation holes. It is installed between the outlet of the second set of air ducts of the cross-flow heat exchanger 3 and the internal condenser 5. The use of the second air distribution plate 71 also ensures that the return air is evenly dispersed, allowing for sufficient contact and heat exchange with the internal condenser 5.

[0034] In this embodiment, a water collection tray 41 is arranged below the evaporator 4 inside the second working chamber 12. A drain pipe is connected to the water collection tray 41. The drain pipe extends to the outside of the housing 1. The water collection tray 41 collects the condensate dripping from the evaporator 4 and discharges it to the outside of the housing 1 through the drain pipe.

[0035] The enclosure 1 includes a door 9, which is connected to the frame of the enclosure 1 by bolts or snap-fit, allowing for disassembly. This door 9 is used to open and close the aforementioned filter chamber 14, first working chamber 11, second working chamber 12, and third working chamber 13. Opening the door 9 allows for maintenance and replacement of the devices within each chamber. Temperature and humidity detectors 8 are positioned on the enclosure 1 corresponding to the filter chamber 14, first working chamber 11, second working chamber 12, and third working chamber 13. These detectors monitor the temperature and humidity within each chamber. Multiple temperature and humidity detectors can be arranged at different locations within each chamber. Each temperature and humidity detector 8 has an exposed reading position on the enclosure 1, allowing its readings to be read from outside the enclosure 1.

[0036] In practical use, the return air discharged from the spray booth enters the filter chamber 14 through the air inlet 15. The return air passes through the paint mist filter 2 to filter out volatile organic compounds in the return air. The return air then enters the cross-flow heat exchanger 3 for heat exchange and cooling, and then enters the second working chamber 12. After being evenly dispersed by the first air distribution plate 7, the return air is cooled down after heat exchange with the evaporator 4. The moisture contained in the return air condenses to form condensate. At the same time, the evaporator 4 recovers the heat energy generated during the condensation of moisture and transfers it to the inner condenser 5. The cooled and dehumidified return air is dispersed by the first air distribution plate 7 and then flows back into the cross-flow heat exchanger 3 for heat exchange and heating. The heated return air then enters the third working chamber 13. After being evenly dispersed by the second air distribution plate 71, it is heated again after heat exchange with the inner condenser 5 to form hot air. The formed hot air is delivered into the spray booth through the air outlet 16. The above method can filter, dehumidify, and heat the return air discharged from the paint booth, and recover and reuse the heat energy contained in the return air. It also combines dehumidification and heating of the return air to achieve energy exchange and utilization, effectively realizing energy saving. Through the combined use of the first and second air distribution plates 71, the return air can be evenly dispersed in the second and third working chambers 12 and 13, allowing for sufficient heat exchange with the evaporator 4 and the internal condenser 5. This ensures efficient and thorough dehumidification and heating of the return air, effectively improving the quality of the generated hot air and demonstrating strong practicality.

[0037] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A hot air device for a spray booth, comprising a housing and a circulating heat exchange device; characterized in that: The housing contains independently arranged filter chambers, a first working chamber, a second working chamber, and a third working chamber; the housing is provided with an air inlet communicating with the filter chamber and an air outlet communicating with the third working chamber. The first working chamber is equipped with a crossflow heat exchanger; the inlet of the first set of air ducts of the crossflow heat exchanger is connected to the filter chamber, and the outlet of the first set of air ducts is connected to the second working chamber; the inlet of the second set of air ducts of the crossflow heat exchanger is connected to the second working chamber, and the outlet of the second set of air ducts is connected to the third working chamber. The filter chamber is equipped with a paint mist filter for filtering return air, located between the air inlet and the inlet of the first set of air ducts of the crossflow heat exchanger. The circulating heat exchange device includes a compressor, an evaporator, a throttling device, and an internal condenser connected in sequence to form a loop; the evaporator is located in the second working chamber; and the internal condenser is located in the third working chamber.

2. The hot air device for a spray booth according to claim 1, characterized in that: The second working chamber is equipped with a first air distribution plate; ventilation holes are distributed on the first air distribution plate; the first air distribution plate is installed between the outlet of the first set of air ducts of the crossflow heat exchanger and the evaporator, and between the inlet of the second set of air ducts of the crossflow heat exchanger and the evaporator.

3. The hot air device for a spray booth according to claim 1, characterized in that: The third working chamber is equipped with a second air distribution plate; the second air distribution plate is provided with ventilation holes; the second air distribution plate is provided between the outlet of the second set of air ducts of the crossflow heat exchanger and the internal condenser.

4. A hot air device for a spray booth according to claim 1, characterized in that: The circulating heat exchange device includes an external condenser; the external condenser is located outside the housing; the inlet end of the external condenser is connected to the circuit between the compressor and the internal condenser; the outlet end of the external condenser is connected to the circuit between the throttling device and the internal condenser.

5. A hot air device for a spray booth according to claim 1, characterized in that: The second working chamber is equipped with a water receiving tray located below the evaporator; a drain pipe is connected to the water receiving tray; the drain pipe extends to the outside of the chamber.

6. A hot air device for a spray booth according to claim 1, characterized in that: The box contains an equipment compartment; the compressor is located inside the equipment compartment.

7. A hot air device for a spray booth according to claim 1, characterized in that: The paint mist filter includes a primary filter and a secondary filter arranged sequentially on the return air conveying route; the secondary filter is a V-type filter.

8. A hot air device for a spray booth according to claim 1, characterized in that: The housing is equipped with doors for opening and closing the filter chamber, the first working chamber, the second working chamber, and the third working chamber.

9. A hot air device for a spray booth according to claim 1, characterized in that: The housing is equipped with temperature and humidity detectors for detecting the temperature and humidity in the filter chamber, the first working chamber, the second working chamber, and the third working chamber; the temperature and humidity detectors have a value reading position exposed on the housing.

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