Low-temperature quick drying device for spraying primer on petroleum drill rod

Abstract

The utility model discloses a low-temperature quick drying device for spraying primer on a petroleum drill rod, which comprises a drying rack, a drill rod inlet is arranged on one side of the drying rack, a drilling machine outlet corresponding to the drilling machine inlet is arranged on the other side of the drying rack, and a hot air drying structure is arranged on the drying rack. The utility model relates to the technical field of drill rod paint spraying, in particular to a low-temperature quick drying device for spraying primer on a petroleum drill rod, which recovers waste heat of waste gas through a plate heat exchanger to preheat fresh air and is matched with matrix air supply holes at the bottom to form a uniform hot air curtain, so that quick low-temperature curing of the primer is realized; energy consumption is comprehensively reduced while drying efficiency is guaranteed, and the problem of contradiction between rate and energy consumption of a traditional low-temperature process is thoroughly solved.

Description

Technical Field

[0001] This utility model relates to the field of drill pipe painting technology, specifically a low-temperature rapid drying device for spraying primer onto oil drill pipes. Background Technology

[0002] In the modern application of oil drill pipes, in order to improve their resistance to erosion by groundwater and other corrosive substances and to protect them, it is usually necessary to spray a primer onto the drill pipe. After spraying, the drill pipe needs to be dried. At present, natural air drying and infrared heating drying are often used to dry the oil drill pipe.

[0003] Low-temperature rapid drying achieves rapid drying of the primer by controlling parameters such as temperature, humidity, and airflow at relatively low temperatures. This technology combines multiple heating methods, such as hot air circulation, infrared heating, or microwave assistance, aiming to improve drying efficiency while avoiding the negative impact of high temperatures on drill rod materials and paint film quality.

[0004] However, while current low-temperature rapid drying equipment can reduce energy consumption, in order to meet the requirements of industrial production cycle, some equipment needs to compensate for the rate reduction caused by low temperature by increasing the hot air temperature or extending the drying time. This compromise may weaken the energy-saving advantage of low-temperature technology, and may even increase the overall energy consumption due to long-term operation. In view of this, in-depth research was conducted on the above issues, which led to this case. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a low-temperature rapid drying device for spraying primer on oil drill pipes, thus solving the existing technical problems.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a low-temperature rapid drying device for spraying primer on oil drill pipe, including a drying frame, a drill pipe inlet on one side of the drying frame, a drill outlet on the other side of the drying frame corresponding to the drill inlet, and a hot air drying structure on the drying frame;

[0007] The hot air drying structure includes an air supply shell, which is installed on the drying frame. An air supply pump is installed on the air supply shell. A diverter is installed at the bottom of the drying frame. The diverter is a rectangular cavity shell with a number of air supply holes arranged in a matrix on it. A flow guiding device is installed at the top of the drying shell.

[0008] The hot air drying structure also includes a recovery shell, which is installed on the flow guiding device. A plate heat exchanger is installed on the recovery shell. A heat exchange groove is installed on the air inlet of the air supply shell. Heat exchange fins are installed on the heat exchange groove. The heat exchange groove is connected to the plate heat exchanger.

[0009] Preferably, the heat exchange tank is connected to the plate heat exchanger via several connecting pipes. The heat exchange tank is a circular plate with several air inlets evenly distributed on it.

[0010] Preferably, the flow guiding device includes an exhaust port, which is located on the top of the drying frame. A protective top shell is provided on the exhaust port, and a flow guiding fan is provided inside the protective top shell. The exhaust port is also provided on the protective top shell.

[0011] Preferably, the air supply housing and the split air supply device are connected separately, and a filter screen is connected to the top opening of the air supply housing.

[0012] Preferably, a pair of guide rollers are provided on both sides of the drill rod inlet and drill rod outlet of the dryer casing.

[0013] Preferably, the exhaust port is connected to the recovery casing. Beneficial effects

[0014] This utility model provides a low-temperature rapid drying device for primer spraying on oil drill pipe. It offers the following advantages: This low-temperature rapid drying device for primer spraying on oil drill pipe utilizes a plate heat exchanger to recover waste heat from exhaust gas and preheat fresh air. Combined with a bottom matrix of air outlets to form a uniform hot air curtain, it achieves rapid low-temperature curing of the primer. The top negative pressure suction and heat recovery system work synergistically to comprehensively reduce energy consumption while ensuring drying efficiency, thus completely resolving the contradiction between drying rate and energy consumption in traditional low-temperature processes. Attached Figure Description

[0015] Figure 1 This is a first three-dimensional structural diagram of the low-temperature rapid drying device for spraying primer on oil drill pipe according to the present invention.

[0016] Figure 2 This is a second three-dimensional structural diagram of the low-temperature rapid drying device for spraying primer on oil drill pipe according to the present invention.

[0017] Figure 3 This is a front view schematic diagram of the low-temperature rapid drying device for spraying primer on oil drill pipe according to the present invention.

[0018] In the diagram: 1. Dryer frame; 2. Drill rod inlet; 3. Drill rig outlet; 4. Air supply casing; 5. Air supply pump; 6. Flow divider; 7. Air supply hole; 8. Flow guide device; 9. Plate heat exchanger; 10. Heat exchange tank; 11. Heat exchange fins; 12. Connecting pipe; 13. Filter screen; 14. Guide roller; 801. Exhaust port; 802. Protective top shell; 803. Flow guide fan. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-3 This utility model provides an implementation scheme: Although current low-temperature rapid drying equipment can reduce energy consumption, in order to meet the requirements of industrial production cycle, some equipment needs to compensate for the rate reduction caused by low temperature by increasing the hot air temperature or extending the drying time. This compromise may weaken the energy-saving advantage of low-temperature technology, and may even increase the overall energy consumption due to long-term operation.

[0021] To address the aforementioned issues, this application discloses a low-temperature rapid drying device for spraying primer onto oil drill pipes. This device achieves low-temperature, high-efficiency drying through staged heat recovery and directional airflow enhancement. Specifically, it includes a drying frame 1, with a drill pipe inlet 2 on one side and a drill rig outlet 3 on the other side corresponding to the drill pipe inlet. Guide rollers 14 are installed at the drill pipe inlet 2 and outlet to ensure the drill pipe passes through at a uniform speed. A hot air drying structure is installed on the drying frame 1 to dry and cure the paint sprayed onto the drill pipe surface.

[0022] Specifically, refer to the instruction manual. Figure 1-3 It can be seen that in the hot air drying structure: the air supply fan on the air supply shell 4 delivers hot air to the bottom rectangular split air supply device 6. The bottom of the drying frame 1 is equipped with a split air supply device 6, which is a rectangular cavity shell. Several air supply holes 7 are arranged in a matrix on the split air supply device 6. The matrix arrangement of the air supply holes 7 forms a uniform laminar flow air curtain. The upper part of the split air supply device 6 of the drill rod copper hot pot achieves low-temperature drying by passing hot air through the outside of the drill rod.

[0023] Furthermore, the hot air drying structure also includes a recovery shell, which is installed on the flow guiding device 8. A plate heat exchanger 9 is installed on the recovery shell, and a heat exchange trough 10 is installed on the air inlet of the air supply shell 4. Heat exchange fins 11 are installed on the heat exchange trough 10, which is connected to the plate heat exchanger 9. The centrifugal fan of the top flow guiding device 8 draws the hot and humid exhaust gas into the recovery shell, and recovers the waste heat through the plate heat exchanger 9. The recovered heat energy is introduced into the heat exchange trough 10 through the connecting pipe 12. The finned heat exchanger in the trough preheats the fresh air to 30-40°C, so that the energy required for the fresh air to be reheated is lower, and the overall energy consumption is reduced.

[0024] Dynamic drying process: The drill rod rotates through the drying zone (100 rpm), and hot air (70℃±5℃) from the bottom impacts the drill rod surface vertically through the matrix holes, forcibly convection carrying away the paint film solvent; the top guide fan 803 simultaneously draws in solvent-containing waste gas, which exchanges heat with fresh air in the plate heat exchanger 9 in a counter-current manner, achieving heat energy circulation. This design enables the primer to cure rapidly in 3 minutes below 80℃, reducing drying time by 50% compared to traditional processes without compromising temperature.

[0025] As a preferred option, the heat exchange tank 10 and the plate heat exchanger 9 are sealed and connected by a corrugated connecting pipe 12. The air inlet holes evenly distributed on the circular plate of the heat exchange tank 10, combined with the fin structure, improve the fresh air preheating efficiency by at least 15%.

[0026] As a preferred option, the protective top shell 802 of the flow guiding device 8 has a built-in flow guiding fan 803, and the exhaust port 801 is designed with an inclination to prevent condensate backflow and maintain airflow stability.

[0027] As a preferred option, the air supply housing 4 and the diverter air supply unit 6 are connected by a flange, and the top removable filter screen 13 blocks dust from polluting the hot air.

[0028] As a preferred option, the polyurethane guide rollers 14 at the drill pipe inlet 2 and drill pipe outlet ensure that the drill pipe passes through in the center, avoiding contact with uncured paint surfaces.

[0029] As a preferred option, the exhaust port 801 is further connected to the recovery casing using a high-temperature resistant hose to reduce the impact of vibration transmission on the heat exchanger.

[0030] In summary, this low-temperature rapid drying device for oil drill pipe primer recovers waste heat from exhaust gas and preheats fresh air through a plate heat exchanger 9. Combined with the bottom matrix air supply holes 7 to form a uniform hot air curtain, it achieves rapid low-temperature curing of the primer. The top negative pressure suction and heat recovery system work together to reduce energy consumption while ensuring drying efficiency, thus completely solving the contradiction between the traditional low-temperature process rate and energy consumption.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-temperature rapid drying device for spraying primer onto oil drill pipe, comprising a drying frame (1), wherein a drill pipe inlet (2) is provided on one side of the drying frame (1), and a drill rig outlet (3) is provided on the other side of the drying frame (1) corresponding to the drill rig inlet, characterized in that, The drying frame (1) is equipped with a hot air drying structure; The hot air drying structure includes an air supply housing (4), which is installed on the drying frame (1). An air supply pump (5) is installed on the air supply housing (4). A diverter air supply device (6) is installed at the bottom of the drying frame (1). The diverter air supply device (6) is a rectangular cavity housing. Several air supply holes (7) are arranged in a matrix on the diverter air supply device (6). A flow guiding device (8) is installed on the top of the drying housing. The hot air drying structure also includes a recovery shell, which is set on the flow guiding device (8). A plate heat exchanger (9) is set on the recovery shell. A heat exchange groove (10) is set on the air inlet of the air supply shell (4). A heat exchange fin (11) is set on the heat exchange groove (10). The heat exchange groove (10) is connected to the plate heat exchanger (9).

2. The low-temperature rapid drying device for spraying primer on oil drill pipe according to claim 1, characterized in that, The heat exchange tank (10) is connected to the plate heat exchanger (9) by several connecting pipes (12). The heat exchange tank (10) is a circular plate and several air inlets are evenly distributed on the heat exchange tank (10).

3. The low-temperature rapid drying device for spraying primer on oil drill pipe according to claim 2, characterized in that, The flow guiding device (8) includes an exhaust port (801), which is located on the top of the dryer frame (1). A protective top shell (802) is provided on the exhaust port (801), and a flow guiding fan (803) is provided inside the protective top shell (802). The exhaust port (801) is also provided on the protective top shell (802).

4. The low-temperature rapid drying device for spraying primer on oil drill pipe according to claim 3, characterized in that, The air supply housing (4) and the split air supply device (6) are connected separately, and a filter screen (13) is connected to the top opening of the air supply housing (4).

5. The low-temperature rapid drying device for spraying primer on oil drill pipe according to claim 4, characterized in that, A pair of guide rollers (14) are provided on both sides of the drill rod inlet (2) and drill rod outlet of the dryer casing.

6. The low-temperature rapid drying device for spraying primer on oil drill pipe according to claim 5, characterized in that, The exhaust port (801) is connected to the recovery casing.

Images