Integrated dehumidifier for precision casting shell workshop
By integrating multiple devices into an integrated dehumidifier and using a PLC control system to automatically adjust temperature and humidity, the problem of humidity and temperature control in the precision casting shell-making workshop has been solved, achieving efficient environmental management and improving production efficiency and yield.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI D&S AIR HANDLING EQUIP
- Filing Date
- 2025-09-01
- Publication Date
- 2026-07-21
AI Technical Summary
Existing technologies struggle to effectively control humidity and temperature in precision casting shell-making workshops, especially in environments with humidity below 50%RH and temperatures between 22-27℃. This results in low production efficiency and reduced yield, and the equipment is scattered, making centralized control difficult.
Design an integrated dehumidifier that combines a dehumidifying impeller, humidifier, cooling coil, heating coil, filter, and other equipment into one unit. The PLC control system automatically adjusts the temperature and humidity of the workshop and optimizes the dehumidification effect through a multi-stage filtration and regeneration process.
It achieves precise control of workshop humidity at 30-50%RH and precise control of temperature at 22-27℃, improving production efficiency and yield, and reducing equipment footprint and operating costs.
Smart Images
Figure CN224534396U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of dehumidification equipment technology, specifically relating to an integrated dehumidifier for use in precision casting shell-making workshops. Background Technology
[0002] In precision casting shell making, silica sol-low temperature wax is often used to prepare the shell. This process is widely used, especially for medium and large castings weighing over 1 kg. It has advantages such as high strength, relatively simple process, low cost, stable quality, high dimensional accuracy, and good high-temperature performance. It is suitable for casting thin-walled parts and small and medium-sized parts with complex structures, and can also produce extra-large parts weighing 50-100 kg. The production of silica sol-low temperature wax shells includes wax pattern making, preparation of silica sol surface coating, slurry application and sand application, air drying and reinforcement, patina application and dewaxing, and firing. After molding, it is used for subsequent metal casting. In shell production, especially in the wax pattern making, silica sol surface coating preparation, slurry application and sand application, air drying and reinforcement, patina application and dewaxing processes, the temperature and humidity requirements of the production site are relatively high.
[0003] During the production process in a precision casting shell-making workshop, the internal temperature should be controlled between 22-27℃ and the humidity between 30-50%RH. Specifically, some production lines generate a large amount of moisture and dust during production, requiring rapid dehumidification and air purification. High humidity or low temperature will reduce shell drying efficiency, decrease production efficiency, lower shell surface quality, increase roughness, and reduce yield and quality stability. Low humidity will cause the shell to dry too quickly, leading to cracking and scrapping of the castings. Excessive drying or high temperature will worsen the adhesion of the surface slurry binder, reducing shell strength. In winter, excessively dry production line environments can generate static electricity and dust, which is detrimental to the processing of precision parts and the use of equipment, posing safety hazards to normal production and personnel health.
[0004] If there is a lot of dust inside the workshop, it will reduce the precision of shell making in the production process, increase the scrap rate, damage the indoor air conditioning coils, increase the frequency of replacing filter materials, and cause physical harm to the indoor operators.
[0005] In existing technologies, in traditional precision casting shell-making workshops, when the workshop area is small, small commercial constant temperature and humidity machines are generally used for temperature and humidity control; when the workshop area is large, a combination of comfort air conditioning, refrigeration dehumidifier, cooling fan, and humidifier is generally used to achieve indoor temperature and humidity control. The above methods have the following technical drawbacks:
[0006] (1) Small commercial constant temperature and humidity machine cools the air to below the dew point temperature through compressor refrigeration, and simultaneously achieves cooling and dehumidification. However, when the ambient temperature is low, its operating efficiency will decrease significantly and it cannot meet the indoor humidity requirements. This type of constant temperature and humidity machine can only reduce the humidity to about 50%RH, which is difficult to meet the environmental requirements of the precision casting shell making workshop with a relative humidity of less than 50%RH. In addition, the air volume of commercial constant temperature and humidity machine is small and the dehumidification capacity is limited.
[0007] (2) When the comfort air conditioner, refrigeration dehumidifier, cooling fan and humidifier are used together, the comfort air conditioner meets the temperature requirements in the workshop, the refrigeration dehumidifier is installed in the workshop to meet the humidity requirements in the workshop, the cooling fan can accelerate the air circulation in the workshop and accelerate the evaporation of moisture on the surface of the mold shell, and the humidifier is mainly used in winter to meet the humidity requirements in the workshop. However, the above temperature and humidity control methods have scattered equipment layouts and it is difficult to centrally control temperature and humidity. The humidity is mainly controlled by refrigeration dehumidification, which is difficult to meet the needs of scenarios with humidity below 50%RH. Utility Model Content
[0008] The purpose of this utility model is to provide an integrated dehumidifier for precision casting shell-making workshops, which overcomes the shortcomings of existing technologies. It integrates multiple devices into a dehumidifier, which has the advantages of compact structure and convenient control. It can automatically and effectively regulate the temperature and humidity in the workshop, with humidity controlled at 30-50%RH and temperature controlled at 22-27℃, thus ensuring the environment for shell production.
[0009] To solve the above problems, the technical solution adopted by this utility model is as follows:
[0010] An integrated dehumidifier for a precision casting shell-making workshop includes a dehumidifying rotor processing side and a dehumidifying rotor regeneration side. One side of the dehumidifying rotor processing side is provided with a fresh air filter and a mixed air filter section connected in sequence, with the end of the mixed air filter section furthest from the fresh air filter connected to the dehumidifying rotor processing side. The other side of the dehumidifying rotor processing side is provided with a processing fan and a humidifier connected in sequence, with the end of the processing fan furthest from the humidifier connected to the dehumidifying rotor processing side. A return air inlet is connected between the fresh air filter and the mixed air filter section. A bypass ventilation duct is provided below the dehumidifying rotor processing side, with both ends of the bypass ventilation duct connected to both ends of the dehumidifying rotor processing side. A bypass ventilation valve is provided on the bypass ventilation duct.
[0011] One end of the dehumidifying rotor regeneration side is sequentially provided with a regeneration fan, a regeneration fresh air filter, and a regeneration heater. The air outlet of the dehumidifying rotor regeneration side is connected to the air inlet of the regeneration fan, and the air inlet of the dehumidifying rotor regeneration side is connected to the air outlet of the regeneration heater. The air inlet of the regeneration fresh air filter is connected to a regeneration fresh air inlet pipe.
[0012] Furthermore, the filter element of the fresh air filter is made of one of the following materials: non-woven fabric, nylon mesh, activated carbon filter material, and metal mesh.
[0013] Furthermore, the mixed air filtration section includes a primary filter plate, an electrostatic precipitator, and a secondary filter plate connected in sequence. The primary filter plate is composed of multiple layers of metal fins or interleaved fiber materials. The electrostatic precipitator is composed of a corona electrode, a dust collection electrode, and a power supply system. The secondary filter plate is made of non-woven fabric or glass fiber material.
[0014] Furthermore, a primary refrigeration coil is installed in the connecting pipe between the mixed air filtration section and the dehumidification rotor processing side, and a secondary refrigeration coil and a heating coil are sequentially installed in the pipe between the dehumidification rotor processing side and the processing fan.
[0015] Furthermore, a regenerative cooling coil is installed in the pipe between the regenerative fan and the regenerative fresh air filter.
[0016] Furthermore, the primary refrigeration coil, the secondary refrigeration coil, and the regenerative refrigeration coil are all connected to an external refrigeration unit via pipelines.
[0017] Compared with the prior art, this utility model has the following advantages:
[0018] The present invention describes an integrated dehumidifier for a precision casting shell-making workshop. By integrating multiple devices into the dehumidifier, the temperature and humidity in the workshop are automatically adjusted by a PLC control system. The humidity can be controlled to 30-50%RH and the temperature to 22-27℃, thus ensuring the environment for shell production. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of an integrated dehumidifier used in a precision casting shell-making workshop.
[0020] Figure 2 This is a schematic diagram of the mixed air filter section in an integrated dehumidifier used in a precision casting shell-making workshop.
[0021] In the diagram: 1. Fresh air inlet; 2. Fresh air filter; 3. Return air inlet; 4. Mixed air filter section; 41. Primary filter plate; 42. Electrostatic precipitator; 43. Secondary filter plate; 5. Primary refrigeration coil; 6. Bypass valve; 7. Dehumidifier wheel treatment side; 8. Secondary refrigeration coil; 9. Heating coil; 10. Processing fan; 11. Humidifier; 12. Equipment air outlet; 13. Regenerated fresh air inlet duct; 14. Regenerated fresh air filter; 15. Regenerated heater; 16. Dehumidifier wheel regeneration side; 17. Regeneration fan; 18. Regenerated refrigeration coil. Detailed Implementation
[0022] 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.
[0023] like Figures 1-2 As shown, the integrated dehumidifier for a precision casting shell-making workshop of this utility model includes a dehumidifying rotor processing side 7 and a dehumidifying rotor regeneration side 16. A fresh air filter 2 and a mixed air filter section 4 are sequentially connected on one side of the dehumidifying rotor processing side 7, and the end of the mixed air filter section 4 away from the fresh air filter 2 is connected to the dehumidifying rotor processing side 7. A processing fan 10 and a humidifier 11 are connected to the other side of the dehumidifying rotor processing side 7. The end of the processing fan 10 away from the humidifier 11 is connected to the dehumidifying rotor processing side 7. A return air inlet 3 is connected between the fresh air filter 2 and the mixed air filter section 4. A bypass ventilation duct is provided below the dehumidifying rotor processing side 7, and the two ends of the bypass ventilation duct are respectively connected to the two ends of the dehumidifying rotor processing side 7. A bypass ventilation valve 6 is provided on the bypass ventilation duct.
[0024] One end of the dehumidifying rotor regeneration side 16 is provided with a regeneration fan 17, a regeneration fresh air filter 14 and a regeneration heater 15 connected in sequence. The air outlet of the dehumidifying rotor regeneration side 16 is connected to the air inlet of the regeneration fan 17, and the air inlet of the dehumidifying rotor regeneration side 16 is connected to the air outlet of the regeneration heater 15. The air inlet of the regeneration fresh air filter 14 is connected to a regeneration fresh air inlet pipe 13.
[0025] The filter element of the fresh air filter 2 is made of one of the following materials: non-woven fabric, nylon mesh, activated carbon filter material, or metal mesh. The mixed air filtration section 4 includes a primary filter plate 41, an electrostatic precipitator 42, and a secondary filter plate 43 connected in sequence. The primary filter plate 41 is composed of multiple layers of metal fins or interlaced fiber materials, and its initial filtration efficiency for particles larger than 10μm can reach more than 95%. As the dust layer thickens during use, the filtration efficiency will further improve. It is washable, reducing the cost of use. The electrostatic precipitator 42 consists of a corona electrode, a dust collection electrode, and a power supply system. It uses a high-voltage electric field to ionize the flue gas, and the dust particles are charged and separated from the airflow under the action of the electric field. The diameter of the dust filtered by the electrostatic precipitator 42 is usually between 0.1-10μm. The secondary filter plate 43 is made of non-woven fabric or glass fiber material and is mainly for particles with a diameter of about 1-5μm.
[0026] A primary refrigeration coil 5 is installed in the connecting pipe between the mixed air filter section 4 and the dehumidification rotor treatment side 7. A secondary refrigeration coil 8 and a heating coil 9 are sequentially installed in the pipe between the dehumidification rotor treatment side 7 and the treatment fan 10. A regenerative refrigeration coil 18 is installed in the pipe between the regeneration fan 17 and the regeneration fresh air filter 14. The primary refrigeration coil 5, the secondary refrigeration coil 8 and the regenerative refrigeration coil 18 are all connected to an external refrigeration unit through pipes.
[0027] The function of the fresh air inlet 1 is to replenish fresh air into the room, maintain positive pressure, and prevent fresh air infiltration from affecting indoor humidity; the fresh air filter 2 filters out dust and other particles in the air; the return air inlet 3 allows indoor air to be re-drawn into the dehumidifier for recirculation; the mixed air filter section 4 filters and collects dust in the return air to protect the dehumidifier impeller and purify the air inside the workshop; the primary cooling coil 5 initially cools the air; the dehumidifier impeller's impeller processing side absorbs moisture from the air; the bypass ventilation valve 6 can adjust the impeller's processing airflow by adjusting its opening; the secondary cooling coil 8 further cools the air and regulates the temperature delivered to the workshop; the heating coil 9 heats the cold air in winter to meet indoor temperature requirements; and the processing fan 10... The function of the dehumidifier is to drive airflow through rotation, causing humid air to enter the dehumidifier and simultaneously delivering treated dry air into the production workshop; the function of the humidifier 11 is to humidify the dry air in winter; the function of the equipment air outlet 12 is to deliver the treated dry air into the production workshop; the function of the regeneration fresh air filter 14 is to filter the air entering the regeneration side; the function of the regeneration heater 15 is to heat the incoming air; the dehumidification rotor regeneration side 16 desorbs the moisture absorbed by the dehumidification rotor treatment side 7; the function of the regeneration fan 17 is to send the high-temperature and high-humidity air generated during the regeneration process into the regeneration cooling coil 18; the regeneration cooling coil 18 is to cool the high-temperature and high-humidity air to the dew point, reduce the temperature and water content, and reduce regeneration energy consumption.
[0028] The working process of this utility model is as follows: In summer, outdoor air enters through the fresh air inlet 1; the fresh air is filtered by the fresh air filter 2 and then mixed with the primary return air entering through the primary return air inlet 3; due to a large amount of dust floating inside the precision casting workshop, the mixed air needs to be filtered through the mixed air filter section 4 before entering the primary refrigeration coil 5; the cooling air outlet of the primary refrigeration coil 5 is humidified by the dehumidification wheel's wheel treatment side 7 and then mixed with the air flowing through the bypass ventilation valve 6; the mixed air is refrigerated by the secondary refrigeration coil 8 and then sent into the workshop through the equipment air outlet 12. In winter, the refrigeration coils 5 and 8, as well as the dehumidifier, are not in operation, and the bypass ventilation valve 6 is closed. Outdoor air enters through the fresh air inlet 1. After being filtered by the fresh air filter 2, the fresh air mixes with the primary return air entering through the primary return air inlet 3. After being filtered by the mixed air filter section 4, the mixed air enters the primary refrigeration coil 5, the dehumidifier's rotor processing side 7, and the secondary refrigeration coil 8. The mixed air is heated by the heating coil 9, and then humidified by the humidifier 11 before being sent into the workshop through the equipment air outlet 12 to meet the indoor temperature and humidity requirements in winter. Thus, the purpose of providing suitable temperature and humidity air indoors is achieved.
[0029] For the dehumidifier rotor regeneration side 16 to function properly, outdoor air enters through the regeneration air inlet duct 13 and then passes through the regeneration fresh air filter 14 to remove dust from the air. The filtered regeneration air then enters the regeneration heater 15 located at the right end of the dehumidifier rotor regeneration side 16. The high-temperature flowing air carries away the moisture adhering to the dehumidifier rotor regeneration side 16, allowing the dehumidifier rotor regeneration side 16 to rotate to the lower end and function as the dehumidifier rotor processing side 7, thus enabling normal operation. The regeneration fan 17 sends the high-temperature and high-humidity air generated during the regeneration process into the regeneration cooling coil 18. The regeneration cooling coil 18 is used to cool the high-temperature and high-humidity air to the dew point, reducing the temperature and moisture content, and decreasing regeneration energy consumption.
[0030] This equipment includes a temperature and humidity sensor, a temperature sensor, and a differential pressure sensor. The temperature and humidity sensor is mainly located at the fresh air inlet 1, the return air inlet 3, and the equipment air outlet 12. The temperature sensor is located behind the refrigeration coil 5, the dehumidification rotor processing side 7, the regeneration heater 15, the outlet of the regeneration fan 17, and the regeneration refrigeration coil 18. The differential pressure sensor is mainly located at the fresh air filter 2, the mixed air filter section 4, and the regeneration fresh air filter 14. The main function of the temperature and humidity sensor, the temperature sensor, and the differential pressure sensor is to convert temperature, relative humidity, and pressure difference into measurable and processable electrical signals.
[0031] This integrated dehumidifier contains a PLC automatic control system. The PLC data acquisition module collects, converts, processes, and transmits the electrical signals from the sensors installed in the system, and monitors and controls the operating status of each component of the equipment.
[0032] Through all the above technical solutions, this new invention integrates multiple equipment components together, possessing advantages such as compact structure and convenient control. Based on the mature PLC, it collects different signals and controls the working modes of different electrical equipment. The technical effect produced by the combination of multiple components can automatically and effectively regulate the temperature and humidity in the workshop. The indoor temperature accuracy can be controlled within ±0.5℃ set by the PLC, and the indoor humidity accuracy can be controlled within ±3% set by the PLC, meeting the requirements of indoor temperature 22-27℃ and indoor humidity 30-50%RH, providing favorable technical support for ensuring the production quality of the shell.
[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. An integrated dehumidifier for a precision foundry shell shop comprising a dehumidification rotor process side (7) and a dehumidification rotor regeneration side (16), characterized by: One side of the dehumidification wheel processing side (7) is provided with a fresh air filter (2), a mixed air filter section (4) connected in sequence, and the mixed air filter section (4) is connected with the dehumidification wheel processing side (7) away from the fresh air filter (2). The other side of the dehumidification wheel processing side (7) is connected with a processing fan (10) and a humidifier (11) in sequence, one end of the processing fan (10) away from the humidifier (11) is connected with the dehumidification wheel processing side (7), and a return air inlet (3) is connected between the fresh air filter (2) and the mixed air filter section (4). A bypass air duct is arranged below the dehumidification wheel processing side (7), and the two ends of the bypass air duct are communicated with the two ends of the dehumidification wheel processing side (7) respectively, and a bypass air valve (6) is arranged on the bypass air duct. One end of the dehumidification wheel regeneration side (16) is provided with a regeneration fan (17), a regeneration fresh air filter (14) and a regeneration heater (15) in sequence, the air outlet of the dehumidification wheel regeneration side (16) is connected with the air inlet end of the regeneration fan (17), and the air inlet of the dehumidification wheel regeneration side (16) is connected with the air outlet end of the regeneration heater (15), and the air inlet of the regeneration fresh air filter (14) is connected with a regeneration fresh air inlet pipe (13).
2. An integrated dehumidifier for a precision foundry shell shop according to claim 1, wherein: The filter core of the fresh air filter (2) is made of one of non-woven fabric, nylon net, activated carbon filter material and metal mesh.
3. An integrated dehumidifier for a precision foundry shell shop according to claim 1, wherein: The mixed air filter section (4) comprises a primary filter plate (41), an electrostatic precipitator (42) and a secondary filter plate (43) connected in sequence, the primary filter plate (41) is composed of multiple layers of metal fins or staggered fiber materials, the electrostatic precipitator (42) is composed of a corona electrode, a dust collecting electrode and a power supply system, and the secondary filter plate (43) is made of non-woven fabric or glass fiber material.
4. An integrated dehumidifier for a precision foundry shell shop according to claim 1, wherein: A primary refrigeration coil (5) is arranged in the connecting pipeline between the mixed air filter section (4) and the dehumidification wheel processing side (7), and a secondary refrigeration coil (8) and a heating coil (9) are arranged in the pipeline between the dehumidification wheel processing side (7) and the processing fan (10) in sequence.
5. An integrated dehumidifier for a precision foundry shell shop according to claim 4, wherein: A regeneration refrigeration coil (18) is arranged in the pipeline between the regeneration fan (17) and the regeneration fresh air filter (14).
6. An integrated dehumidifier for a precision foundry shell shop according to claim 5, wherein: The primary refrigeration coil (5), the secondary refrigeration coil (8) and the regeneration refrigeration coil (18) are connected with an external refrigeration machine through pipelines.