Laboratory oven for coating products

Abstract

The utility model discloses a laboratory drying oven for coating products, and belongs to the technical field of drying equipment. The drying oven comprises a drying oven main body, a porous plate and a supporting seat in the drying oven main body, a heating assembly at the bottom and a temperature and humidity sensor on the wall. The drying oven is characterized in that an air outlet seat and a negative pressure fan are arranged above the drying oven main body, a reversing air valve is connected through an air outlet pipe, two output ends of the reversing air valve are respectively connected with a drying pipe and a humidifying pipe, and the two pipes are finally converged at an air inlet pipe and led to an air outlet disc in the oven. A detachable drying cylinder filled with silica gel is arranged at the middle section of the drying pipe; the middle section of the humidifying pipe is connected with a Venturi pipe in series, and the throat portion is connected into the ultrasonic humidifying assembly through a connecting pipe. The utility model solves the problem that the conventional laboratory oven is difficult to simulate a complex variable humidity drying process, integrates drying and humidifying functions, and is particularly suitable for research and development and quality detection of coated products with accurate requirements on drying curves.

Description

Technical Field

[0001] This utility model relates to the field of drying equipment technology, and in particular to a laboratory drying oven for coated products. Background Technology

[0002] Coating technology is widely used in fields such as optical thin films, flexible electronics, and new energy battery electrodes. The drying and curing process of the coating directly affects its final performance and quality. During laboratory research and process optimization, it is necessary to accurately simulate and study the effects of different temperature and humidity conditions on the coating morphology, adhesion, porosity, and functional properties. Therefore, laboratory ovens not only need to provide a stable heating environment but also should have the ability to independently, rapidly, and programmably adjust temperature and humidity during experiments to match the complex and ever-changing coating drying process curves.

[0003] Currently, most common laboratory ovens focus on temperature control, achieving stepped heating through multi-segment temperature control programs, and even drying at different temperature ranges through alternating operation of dual hot air modules (as shown in reference document CN221197843U). However, these devices still have significant shortcomings in humidity control: they lack active humidification functions and can only achieve a rough reduction in humidity through dehumidification. In actual coating processes, many materials need to undergo a complex process of "drying-conditioning-re-drying." Existing equipment struggles to achieve precise, alternating control of drying and humidification modes without interruption or sample contamination within the same experimental process. This prevents researchers from conducting complete drying kinetic studies under conditions close to the actual process, limiting the applicability of laboratory ovens in the development of high-end coating materials. Utility Model Content

[0004] The purpose of this invention is to provide a laboratory drying oven for coated products, which can overcome the shortcomings of the prior art.

[0005] To achieve the above objectives, a laboratory oven for coating products is provided, comprising an oven body, an air outlet seat fixedly connected to the upper side wall of the oven body, an air outlet pipe fixedly connected to the upper end of the air outlet seat, a reversing air valve fixedly connected to the end of the air outlet pipe, a drying pipe and a humidifying pipe fixedly connected to the two output ends of the reversing air valve respectively, the ends of the drying pipe and the humidifying pipe fixedly connected to the same air inlet pipe, an air outlet plate fixedly connected to the end of the air inlet pipe, a drying cylinder detachably connected to the drying pipe through two connecting sleeves, and a Venturi tube fixedly connected to the middle of the humidifying pipe;

[0006] A perforated plate is fixedly connected inside the oven body. Two support seats are fixedly connected to the upper side wall of the perforated plate. A heating component is installed inside the oven body and directly below the perforated plate. A temperature sensor and a humidity sensor are installed on the inner side wall of the oven body and directly above the perforated plate.

[0007] A control panel is provided on the outside of the main body of the oven. The control panel is electrically connected to the reversing valve, heating component, temperature sensor and humidity sensor. It is used to automatically control the switching of the reversing valve and the start and stop of the heating component according to the preset program or the real-time detected temperature and humidity data, so as to realize the precise adjustment of temperature and humidity inside the oven.

[0008] According to the laboratory drying oven for coating products, a negative pressure fan is fixedly connected inside the air outlet seat; the negative pressure fan is a variable frequency speed control fan, whose speed is adjustable, and is used to adjust the exhaust volume according to the airflow demand inside the drying oven.

[0009] According to the laboratory oven for coating products, the front side wall of the oven body is hinged with a sealed door, an observation window is fixedly connected inside the sealed door, and a handle is fixedly connected to the front side wall of the sealed door; the observation window is double-layered heat-insulating and explosion-proof glass, and an anti-condensation heating film is provided on the inner side.

[0010] According to the laboratory drying oven for coating products, a connecting pipe is fixedly connected to the throat of the Venturi tube, and an ultrasonic humidification component is fixedly connected to one end of the connecting pipe; the ultrasonic humidification component includes a water tank, an ultrasonic atomizing plate and a water level sensor, and the water tank is connected to the throat of the Venturi tube through the connecting pipe, so as to draw the atomized water vapor into the airflow by utilizing the Venturi effect.

[0011] According to the laboratory drying oven for coating products, the lower ends of both the drying tube and the humidifying tube are equipped with one-way air valves to prevent airflow interference and energy loss.

[0012] According to the laboratory drying oven for a coated product, the drying cylinder includes a cylinder body filled with a desiccant, the desiccant being silica gel; the silica gel is color-changing silica gel, the color of which changes with the amount of moisture absorbed, making it easy to visually judge the state of the desiccant; both ends of the drying cylinder are provided with removable filter screens to prevent desiccant particles from entering the airflow duct.

[0013] According to the laboratory drying oven for coating products, the upper and lower ends of the drying cylinder are provided with threads that mate with the connecting sleeve, and a sealing gasket is provided between the connecting sleeve and the drying cylinder; the sealing gasket is made of high-temperature resistant silicone material; the outer side of the drying cylinder is provided with anti-slip texture for easy disassembly and replacement.

[0014] According to the laboratory oven for coating products, the upper sidewall of the air outlet plate is uniformly provided with a plurality of through holes, and the air outlet plate is directly opposite the perforated plate; the through holes have a tapered structure, which is used to accelerate the airflow and improve the uniformity of the airflow distribution.

[0015] This utility model has the following beneficial effects:

[0016] 1. Compared with existing technologies, this invention controls the airflow through the drying or humidification branch using a reversing valve, enabling the execution of complex drying processes involving different humidity stages on the same coated sample without interrupting the experiment. The drying branch employs a replaceable drying cylinder for efficient dehumidification, while the humidification branch utilizes a venturi tube to draw in ultrasonically atomized water vapor, ensuring uniform and rapid humidification. This allows the oven to realistically simulate the multi-stage humidity process of drying, conditioning, and re-drying in actual production, significantly enhancing the depth of research and development and the practicality of the equipment.

[0017] 2. Compared with existing technologies, the humidification module in this invention utilizes the Venturi effect, drawing atomized water vapor into the airflow without requiring additional power. It features a simple structure and low energy consumption. The drying cylinder is transparent and filled with color-changing silica gel, allowing for visible saturation. It also features a threaded connection for quick assembly and disassembly, facilitating replacement and maintenance. Filters are installed at both ends of the cylinder to prevent desiccant particles from contaminating the gas path and samples, ensuring experimental cleanliness and long-term operational reliability. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0019] Figure 1 This is a schematic diagram of the structure of a laboratory drying oven for coating products according to this utility model;

[0020] Figure 2 This is a side view of a laboratory drying oven for coating products according to this utility model;

[0021] Figure 3 This is a cross-sectional schematic diagram of a laboratory drying oven for coating products according to this utility model;

[0022] Figure 4 This is a top view schematic diagram of a laboratory drying oven for coating products according to this utility model.

[0023] Legend:

[0024] 1. Oven body; 101. Perforated plate; 102. Support base; 103. Heating component; 104. Temperature sensor; 105. Humidity sensor; 2. Sealed door; 201. Observation window; 202. Handle; 3. Air outlet seat; 301. Negative pressure fan; 4. Air outlet pipe; 401. Reversing air valve; 5. Air inlet pipe; 501. Air outlet plate; 6. Drying pipe; 601. Connecting sleeve; 602. Drying cylinder; 7. Humidifying pipe; 701. Venturi tube; 8. Ultrasonic humidification component; 801. Connecting pipe; 9. One-way air valve. Detailed Implementation

[0025] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0026] Reference Figures 1-4 This utility model provides a laboratory oven for coating products, which includes an oven body 1. An air outlet seat 3 is fixedly connected to the upper side wall of the oven body 1. A negative pressure fan 301 is installed inside the air outlet seat 3. The negative pressure fan 301 is preferably a variable frequency speed control fan, which can adjust the exhaust air volume according to experimental requirements to achieve precise control of the airflow speed inside the oven.

[0027] An air outlet 4 is connected to the upper end of the air outlet seat 3 via a flange, and a reversing air valve 401 is installed at the end of the air outlet 4. The reversing air valve 401 is an electromagnetically controlled three-way valve, and its two output ends are connected to the drying pipe 6 and the humidifying pipe 7 respectively via quick-connect couplings. Both the drying pipe 6 and the humidifying pipe 7 are high-temperature resistant hoses, and their ends converge and are connected to the same air inlet pipe 5. An air outlet plate 501 is fixedly connected to the outlet end of the air inlet pipe 5. Several tapered through holes are evenly distributed on the upper surface of the air outlet plate 501 to spray the airflow evenly and at high speed upwards.

[0028] A drying cylinder 602 is detachably connected to the middle of the drying tube 6 via two connecting sleeves 601. The drying cylinder 602 is a cylindrical transparent cylinder filled with color-changing silica gel desiccant. Removable filter screens are provided at both ends of the cylinder to prevent desiccant particles from entering the tube. Both ends of the drying cylinder 602 have external threads that mate with the internal threads of the connecting sleeves 601. A high-temperature resistant silicone sealing gasket is provided at the connection point to ensure airtightness. The outer wall of the drying cylinder 602 has anti-slip textures for easy disassembly and replacement.

[0029] A venturi tube 701 is connected in series in the middle of the humidifying tube 7. The throat of the venturi tube 701 is connected to the ultrasonic humidifying assembly 8 via a connecting tube 801. The ultrasonic humidifying assembly 8 includes a water tank, an ultrasonic atomizing plate, a water level sensor, and a controller. The water in the water tank is ultrasonically atomized to form micron-sized water mist, which is drawn into the airflow through the negative pressure generated by the venturi tube 701, achieving a rapid and uniform humidification effect.

[0030] A perforated plate 101 is fixedly installed inside the oven body 1. Two support seats 102 are provided on the upper surface of the perforated plate 101 for placing the coated sample. A heating assembly 103, preferably an infrared heating tube or a PTC heater, is installed below the perforated plate 101 to achieve uniform heating of the sample. A temperature sensor 104 and a humidity sensor 105 are installed on the upper inner wall of the oven body 1 to monitor the temperature and humidity inside the oven in real time.

[0031] The outer side of the oven body 1 is equipped with a touch-screen control panel, which is electrically connected to the reversing valve 401, heating element 103, negative pressure fan 301, temperature sensor 104, humidity sensor 105, and ultrasonic humidification element 8. Users can preset parameters such as temperature and humidity curves, drying time, and airflow speed through the control panel. The system automatically adjusts the switching of the reversing valve 401, heating power, fan speed, and humidification amount based on sensor feedback, achieving fully automatic and programmable temperature and humidity control.

[0032] The main body of the oven 1 is hinged to a sealing door 2 at the front. A double-layered, heat-insulating, explosion-proof glass observation window 201 is embedded in the center of the sealing door 2, with an anti-condensation heating film on the inner side to prevent fogging. The edges of the sealing door 2 are equipped with magnetic sealing strips that fit tightly against the door frame to ensure the oven's airtightness. A pressure balancing valve is also installed at the door frame to automatically balance the internal and external air pressure when the door is opened, preventing airflow impact from affecting the experimental environment.

[0033] Both the drying tube 6 and the humidifying tube 7 are equipped with one-way air valves 9 to prevent reverse airflow interference during switching, ensuring the independence and stability of the drying and humidifying processes.

[0034] Working principle: The user places the coated sample on the support base 102, closes the sealing door 2, and sets the drying process parameters, including temperature curve, humidity curve, and drying time, through the control panel. After the system starts, the negative pressure fan 301 starts working to extract the gas from the oven; the heating component 103 starts to preheat the oven. When it is necessary to reduce the humidity inside the oven, the control panel controls the reversing valve 401 to switch to the drying tube 6 passage. The airflow passes through the silica gel desiccant in the drying cylinder 602, adsorbs moisture, and forms a dry airflow, which is evenly sprayed onto the sample surface through the air inlet pipe 5 and the air outlet plate 501 to achieve the drying treatment of the sample. When it is necessary to increase the humidity inside the oven, the reversing valve 401 switches to the humidification tube 7 passage, and at the same time, the ultrasonic humidification component 8 is activated. Water mist is drawn into the airflow through the venturi tube 701 to form a humidified airflow, which is evenly humidified on the sample area through the air inlet pipe 5 and the air outlet plate 501. Temperature sensor 104 and humidity sensor 105 monitor the internal conditions of the chamber in real time and feed the data back to the control panel. The system automatically adjusts the switching frequency of the reversing valve 401, heating power, fan speed, and humidification rate according to a preset program to achieve dynamic balance and precise control of temperature and humidity. After the experiment, the system automatically stops heating and airflow circulation. Once the temperature inside the chamber has dropped to a safe range, the user can open the sealed door 2 to remove the sample.

[0035] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A laboratory oven for coating products, characterized in that, Including the oven body (1), the upper side wall of the oven body (1) is fixedly connected with the air outlet seat (3), the upper end of the air outlet seat (3) is fixedly connected with the air outlet pipe (4), the tail end of the air outlet pipe (4) is fixedly connected with the reversing air valve (401), the two output ends of the reversing air valve (401) are fixedly connected with the drying pipe (6) and the humidification pipe (7) respectively, the tail ends of the drying pipe (6) and the humidification pipe (7) are fixedly connected with the same air inlet pipe (5), the tail end of the air inlet pipe (5) is fixedly connected with the air outlet disc (501), the drying pipe (6) is detachably connected with the drying cylinder (602) through two connecting sleeves (601), the middle part of the humidification pipe (7) is fixedly connected with the venturi tube (701); The inside of the oven body (1) is fixedly connected with the perforated plate (101), the upper side wall of the perforated plate (101) is fixedly connected with two support seats (102), the inside of the oven body (1) and the lower side of the perforated plate (101) are provided with the heating assembly (103), and the inner side wall of the oven body (1) and the upper side of the perforated plate (101) are provided with the temperature sensor (104) and the humidity sensor (105).

2. A laboratory oven for coating products according to claim 1, characterized in that, The inside of the air outlet seat (3) is fixedly connected with the negative pressure fan (301).

3. A laboratory oven for coating products according to claim 1, characterized in that, The front side wall of the oven body (1) is hingedly connected with the sealing door (2), the inside of the sealing door (2) is fixedly connected with the observation window (201), and the front side wall of the sealing door (2) is fixedly connected with the handle (202).

4. A laboratory oven for coating products according to claim 1, characterized in that, The throat of the venturi tube (701) is fixedly connected with the connecting pipe (801), one end of the connecting pipe (801) is fixedly connected with the ultrasonic humidification assembly (8).

5. A laboratory oven for coating products according to claim 1, characterized in that, The lower ends of the drying pipe (6) and the humidification pipe (7) are provided with the one-way air valve (9).

6. A laboratory oven for coating products according to claim 1, characterized in that, The drying cylinder (602) comprises a cylinder body, the cylinder body is filled with a drying agent, and the drying agent is silica gel.

7. A laboratory oven for coating products according to claim 1, characterized in that, The upper end and the lower end of the drying cylinder (602) are provided with threads matched with the connecting sleeve (601), and the connecting sleeve (601) and the drying cylinder (602) are provided with sealing pads.

8. A laboratory oven for coating products according to claim 1, characterized in that, The upper side wall of the air outlet disc (501) is uniformly provided with a plurality of through holes, and the air outlet disc (501) is opposite to the perforated plate (101).

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