Humidity control device of surface drying furnace
By using a humidity sensor and an electric actuator together, the opening of the exhaust port butterfly valve is automatically adjusted, which solves the problem of energy loss caused by improper humidity control in the surface drying furnace and achieves a highly efficient and energy-saving sand core drying effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING NIANDA STOVE CO LTD
- Filing Date
- 2025-05-27
- Publication Date
- 2026-05-19
AI Technical Summary
Existing surface drying furnaces suffer significant energy losses and pose safety hazards during the drying of sand cores. Current technologies cannot effectively control humidity, which leads to heat loss.
A humidity sensor is used to detect the humidity of the air inside the furnace, and the air discharge speed is controlled by the exhaust port butterfly valve. Combined with an electric actuator, the opening of the exhaust port butterfly valve is automatically adjusted to achieve humidity control.
This reduces energy loss during the core drying process, improves drying efficiency, lowers safety risks, and achieves the goal of energy conservation and environmental protection.
Smart Images
Figure CN224253381U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a humidity control device for a surface drying furnace, belonging to the technical field of heat treatment equipment. Background Technology
[0002] The surface drying furnace is mainly used for drying the sand cores used in casting after they have been coated with water-based paint. If the sand cores are not dried properly, it will have adverse consequences for subsequent casting. At best, there will be many sand holes on the surface of the casting, which will affect the quality of the casting. At worst, molten iron will explode when it comes into contact with water, posing a major safety hazard.
[0003] The existing surface drying furnace includes a furnace body, a heater, an exhaust pipe, and an exhaust fan. The heater is installed on and connected to the furnace body. The heater heats the air and delivers the heated air into the furnace body to dry the sand cores conveyed inside the furnace. During the drying process, the moisture inside the sand cores increases the humidity of the air inside the furnace. In order to continuously dry the sand cores, it is necessary to remove the humid air from the furnace body in a timely manner. Therefore, the exhaust pipe is connected to the furnace body, and the exhaust fan is connected to the exhaust pipe to remove the humid air from the furnace body.
[0004] Existing surface drying furnaces directly connect the exhaust pipe to the furnace body, and the dehumidification fan works continuously to continuously exhaust air from the furnace body. Because the air temperature inside the furnace body is high, the continuous exhaust of air will also release heat at the same time, especially when the air humidity inside the furnace body is relatively low. Therefore, existing surface drying furnaces have a large energy loss when drying sand cores, which is not conducive to energy conservation and environmental protection. Summary of the Invention
[0005] The purpose of this invention is to provide a humidity control device for a surface drying furnace, which solves the technical defect of high energy consumption and loss in the existing technology of sand core drying.
[0006] To solve the above problems, the technical solution adopted by this utility model is: a humidity control device for a surface drying oven, including a dehumidification pipe and a dehumidification fan. One end of the dehumidification pipe is connected to the top of the surface drying oven body, and the air inlet of the dehumidification fan is connected to the other end of the dehumidification pipe. The dehumidification fan is used to extract humid air from the surface drying oven. The device also includes a dehumidification port butterfly valve and a humidity sensor. The humidity sensor extends into the surface drying oven body to detect the humidity of the air inside the oven. The dehumidification port butterfly valve is located at the end of the dehumidification pipe connected to the surface drying oven. In use, the dehumidification port butterfly valve adjusts its opening according to the humidity of the air inside the surface drying oven detected by the humidity sensor to discharge the humid air from the surface drying oven. This utility model uses a humidity sensor to detect the air humidity inside the surface drying furnace, thereby controlling the opening of the exhaust valve. When the air humidity inside the furnace is high, the opening of the exhaust valve is increased, allowing the humid air inside the furnace to be discharged quickly, resulting in better drying of the sand cores. Conversely, when the air humidity inside the furnace is relatively low, the opening of the exhaust valve is decreased, slowing down the air discharge rate and reducing heat loss during the sand core drying process, thus achieving energy conservation and environmental protection.
[0007] As a further improvement of this utility model, an electric actuator is installed on the dehumidification pipe. This electric actuator is connected to the dehumidification port butterfly valve, and drives the dehumidification port butterfly valve to rotate, thereby controlling the opening degree of the dehumidification port butterfly valve. This utility model uses an electric actuator in conjunction with a humidity sensor to control the opening degree of the dehumidification port butterfly valve, thereby improving the automation level of this utility model.
[0008] As a further improvement of this invention, the dehumidification pipe includes multiple pipe units, which are connected to different parts of the top of the surface drying furnace. Each pipe unit is equipped with a dehumidification port butterfly valve, and one end of each pipe unit is connected to the air inlet of the dehumidification fan. This invention, with its multiple pipe units, allows for the discharge of humidified air from the surface drying furnace from different locations, enabling faster removal of humidified air and further improving the drying effect of the sand cores.
[0009] As a further improvement of this utility model, it also includes a four-way connector, wherein the number of pipe units is three. One end of each of the three pipe units is connected to the front, middle, and rear parts of the top of the surface drying furnace body, respectively. The other end of each of the three pipe units is connected to the three air inlets of the four-way connector, and the air outlet of the four-way connector is connected to the air inlet of the exhaust fan. This utility model facilitates the connection between the pipe units and the exhaust fan by setting a four-way connector.
[0010] As a further improvement of this utility model, it also includes a main exhaust duct. One end of the main exhaust duct is connected to the air outlet of the exhaust fan, and the other end extends out of the workshop during use to exhaust humid air outside the workshop. By setting up a main exhaust duct, this utility model can discharge the humid, high-temperature air drawn out by the exhaust fan from the production workshop, keeping the workshop relatively dry and preventing the temperature inside the production workshop from becoming too high and causing discomfort to the operators.
[0011] As a further improvement of this utility model, a display device is also included. The humidity sensor is connected to the display device, which displays the air humidity inside the surface drying oven detected by the humidity sensor. The opening of the exhaust butterfly valve is manually adjusted by the operator based on the air humidity displayed on the display device. This utility model provides a display device to conveniently display the air humidity inside the surface drying oven. By observing the humidity information displayed on the display device, the operator can easily control the air humidity inside the surface drying oven.
[0012] In summary, the beneficial effects of this utility model are as follows: By detecting the humidity of the air inside the surface drying furnace and controlling the opening of the exhaust butterfly valve, the humidity inside the surface drying furnace is kept within the range most suitable for sand core drying by controlling the exhaust speed of the air inside the furnace, thereby reducing the heat loss inside the furnace, reducing energy consumption loss during the sand core drying process, and achieving the purpose of energy saving and environmental protection. Attached Figure Description
[0013] Figure 1 This is the front view of this utility model.
[0014] Figure 2 This is a top view of the present invention.
[0015] The components include: 1. Exhaust display pipe; 2. Exhaust fan; 3. Furnace body; 4. Exhaust port butterfly valve; 5. Humidity sensor; 6. Electric actuator; 7. Piping unit; 8. Four-way valve; 9. Main exhaust pipe. Detailed Implementation
[0016] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. Example 1
[0017] like Figure 1 and Figure 2The humidity control device shown is used on the surface drying furnace. This device includes an exhaust pipe 1 and an exhaust fan 2. The exhaust pipe 1 is a round pipe, with one end extending from the top of the furnace body 3 and communicating with the furnace. The connection between the exhaust pipe 1 and the furnace body 3 is sealed, or the exhaust pipe 1 is fixed to the furnace body 3 by welding. The air inlet of the exhaust fan 2 is connected to the other end of the exhaust pipe 1. The exhaust fan 2 is used to extract humid air from inside the surface drying furnace. When the surface drying furnace dries the sand cores transported inside, the humidity of the air inside the furnace increases, requiring timely exhaust. Humid air is discharged while dry air is replenished. Therefore, the humid air in the surface drying furnace is discharged by the exhaust fan 2 through the exhaust pipe 1 to keep the air in the surface drying furnace dry, which is conducive to the drying of sand cores. When the air humidity in the surface drying furnace is high, the exhaust fan 2 will quickly discharge the humid air in the surface drying furnace. When the air humidity in the surface drying furnace is relatively low, the air can be discharged from the surface drying furnace slowly or the discharge of air from the surface drying furnace can be stopped. Replenishing the surface drying furnace with dry air is a prior art technology. An air inlet is opened on the heating chamber located at the top of the surface drying furnace and connected to the surface drying furnace. Air is then replenished into the heating chamber and then enters the surface drying furnace.
[0018] To facilitate the removal of humid air from the surface drying oven, this embodiment is equipped with a humidification outlet butterfly valve 4 and a humidity sensor 5, such as... Figure 1 and Figure 2 As shown, the humidity sensor 5 extends downward from the top of the surface drying oven into the oven body 3 to detect the air humidity inside the surface drying oven. The exhaust port butterfly valve 4 is located at the end of the exhaust pipe 1 that connects to the surface drying oven. When in use, the exhaust port butterfly valve 4 adjusts its opening according to the humidity of the air inside the surface drying oven detected by the humidity sensor 5 to discharge the humid air inside the surface drying oven. This embodiment includes a display device. The humidity sensor 5 is connected to the display device, which displays the air humidity inside the surface drying oven detected by the humidity sensor 5. The opening of the exhaust port butterfly valve 4 is manually adjusted according to the air humidity displayed on the display device. If the air humidity displayed on the display device is greater than the set value, the exhaust port butterfly valve 4 is manually rotated to increase its opening, allowing the humid air inside the surface drying oven to be discharged quickly until the air humidity inside the surface drying oven drops to the set value. Conversely, if the air humidity displayed on the display device is less than the set humidity and the difference is significant, the exhaust port butterfly valve 4 can be manually rotated to decrease its opening, thereby slowing down the air discharge rate inside the surface drying oven and reducing the loss of humidity. In this embodiment, the display device can be placed on the exhaust pipe 1 near the exhaust port butterfly valve 4 to facilitate observation of the detection value of the humidity sensor 5 while manually rotating the exhaust port butterfly valve 4. The display device in this utility model is a monitor.
[0019] like Figure 1 and Figure 2As shown, the dehumidification pipe 1 in this embodiment includes multiple pipe units 7, which are connected to different parts of the top of the surface drying furnace, so that the humid air inside the surface drying furnace can be discharged from different parts of the surface drying furnace. In this embodiment, a dehumidification port butterfly valve 4 is provided in each pipe unit 7, and one end of each pipe unit 7 is connected to the air inlet of the dehumidification fan 2.
[0020] like Figure 1 and Figure 2 As shown, in this embodiment, there are three pipe units 7. To facilitate the connection between the three-stage pipe unit 7 and the dehumidification fan 2, a four-way valve 8 is provided in this embodiment. One end of each of the three pipe units 7 is connected to the front, middle and rear of the top of the furnace body 3 of the surface drying furnace, respectively. The other end of each of the three pipe units 7 is connected to the three air inlets of the four-way valve 8, respectively. The air outlet of the four-way valve 8 is connected to the air inlet of the dehumidification fan 2. In this embodiment, a humidity sensor 5 can be set near each pipe unit 7, or a humidity sensor 5 can be set between each pair of adjacent pipe units 7. In this embodiment, two humidity sensors 5 are preferably set, and the two humidity sensors 5 are respectively set between two adjacent pipe units 7.
[0021] like Figure 1 As shown, in order to facilitate the discharge of humid air from the surface drying furnace to the outside of the production workshop, this embodiment is provided with a main exhaust pipe 9. One end of the main exhaust pipe 9 is connected to the air outlet of the exhaust fan 2, and the other end of the main exhaust pipe 9 extends out of the workshop in use to discharge humid air to the outside of the workshop. Example 2
[0022] This embodiment is an improvement on embodiment 1. Compared to embodiment 1, this embodiment has an electric actuator 6 installed on each exhaust pipe 1. The electric actuator 6 is connected to the exhaust port butterfly valve 4. The electric actuator 6 drives the exhaust port butterfly valve 4 to rotate, thereby controlling the opening degree of the exhaust port butterfly valve 4. In this embodiment, the electric actuator 6 can be a servo motor, a hydraulic cylinder, or a pneumatic cylinder. The servo motor is connected to the rotating shaft of the exhaust port butterfly valve 4 through a gear transmission structure. The cylinder body of the hydraulic cylinder or pneumatic cylinder is installed on a fixed object (such as the furnace body 3 of the surface drying oven). Its piston rod is connected to the rotating shaft of the exhaust port butterfly valve 4 through a connecting rod structure. Thus, the opening degree of the exhaust port butterfly valve 4 can be driven by the forward or reverse rotation of the servo motor or the extension and retraction of the piston rod of the hydraulic cylinder or pneumatic cylinder. The servo motor, hydraulic cylinder, or pneumatic cylinder is connected to the control system of the surface drying oven. The humidity sensor 5 is also connected to the control system of the surface drying oven.
[0023] When the humidity sensor 5 detects high humidity inside the surface drying furnace, the electric actuator 6 drives the exhaust butterfly valve 4 to rotate at a large angle, meaning the exhaust butterfly valve 4 opens wide. This allows for faster exhaust of humid air from the surface drying furnace until the humidity drops to the set value. Conversely, when the humidity sensor 5 detects low humidity inside the surface drying furnace, the electric actuator 6 drives the exhaust butterfly valve to rotate at a small angle, meaning the exhaust butterfly valve 4 opens narrowly or closes completely. This allows for slow or halted exhaust of air from the surface drying furnace, thereby controlling the humidity inside the furnace and ensuring it is at the optimal level for core drying. This invention allows for humidity control within the surface drying furnace to be between 0.1% and 5%.
[0024] The structure of the remaining parts in this embodiment is the same as that in Embodiment 1. For details, please refer to Embodiment 1. This embodiment will not repeat the details.
[0025] Unless otherwise specified in the above description, all parts are existing technology or can be implemented using existing technology. Furthermore, the specific embodiments described in this utility model are merely preferred embodiments of the invention and are not intended to limit the scope of this utility model. That is, all equivalent changes and modifications made within the scope of this utility model patent should be considered within the technical scope of this utility model.
Claims
1. A humidity control device for a surface drying oven, comprising an exhaust pipe and an exhaust fan, one end of the exhaust pipe being connected to the top of the oven body and the exhaust fan inlet being connected to the other end of the exhaust pipe, the exhaust fan being used to extract humid air from inside the surface drying oven, characterized in that: It also includes a vent butterfly valve and a humidity sensor. The humidity sensor extends into the furnace body of the surface drying oven to detect the air humidity inside the oven. The vent butterfly valve is located at the end of the vent pipe that connects to the surface drying oven. When in use, the vent butterfly valve adjusts its opening according to the humidity of the air inside the surface drying oven detected by the humidity sensor to discharge the humid air inside the surface drying oven.
2. The humidity control device for a surface drying oven according to claim 1, characterized in that: An electric actuator is installed on the exhaust pipe. The electric actuator is connected to the exhaust port butterfly valve. The electric actuator drives the exhaust port butterfly valve to rotate, which is used to control the opening degree of the exhaust port butterfly valve.
3. The humidity control device for a surface drying oven according to claim 1, characterized in that: The dehumidification duct consists of multiple duct units, which are connected to different parts of the top of the surface drying furnace. Each duct unit is equipped with a dehumidification outlet butterfly valve, and one end of each duct unit is connected to the air inlet of the dehumidification fan.
4. The humidity control device for a surface drying oven according to claim 3, characterized in that: It also includes a four-way valve, which has three pipe units. One end of each of the three pipe units is connected to the front, middle and rear of the top of the surface drying furnace, respectively. The other end of each of the three pipe units is connected to the three air inlets of the four-way valve, and the air outlet of the four-way valve is connected to the air inlet of the exhaust fan.
5. The humidity control device for a surface drying oven according to claim 1, characterized in that: It also includes a main exhaust duct, one end of which is connected to the air outlet of the exhaust fan, and the other end of which extends out of the workshop when in use to exhaust humid air outside the workshop.
6. The humidity control device for a surface drying oven according to claim 1, characterized in that: It also includes a display device, with a humidity sensor connected to the display device. The display device is used to display the air humidity inside the surface drying oven detected by the humidity sensor, and the opening of the exhaust port butterfly valve is manually adjusted by the operator based on the air humidity inside the surface drying oven displayed on the display device.