Low temperature air energy dryer
By utilizing heat pump heating circulation and waste heat in three stages, the problem of high energy consumption and pollution of traditional drying equipment is solved, achieving efficient and environmentally friendly low-temperature drying, and ensuring material quality and heating uniformity.
Patent Information
- Application Number
- CN202521601171.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-30
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-07-30
AI Technical Summary
Traditional drying equipment is energy-intensive, heats unevenly, and pollutes the environment, especially in low-temperature drying scenarios, which can easily lead to material deterioration.
The heat pump heating circulation mechanism is adopted to achieve efficient heat transfer through the reverse Carnot cycle. Combined with the three-stage utilization of waste heat and the rotating material rack design, it ensures uniform heating and environmental protection.
It achieves a highly efficient, energy-saving, and environmentally friendly low-temperature drying process with high temperature control accuracy, significantly reducing energy consumption and preventing material deterioration, thus improving drying quality and efficiency.
Smart Images
Figure CN224681125U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of drying equipment technology, specifically a low-temperature air-source heat pump dryer. Background Technology
[0002] A low-temperature dryer is a device specifically designed for drying materials at lower temperatures. By precisely controlling temperature and humidity conditions, it effectively meets the drying needs of various materials and ensures product quality and performance. The working principle of a low-temperature dryer is mainly based on two mechanisms: heat conduction and air convection. It can achieve a highly efficient and energy-saving drying process while avoiding damage to materials from high temperatures.
[0003] However, most traditional drying equipment currently relies on electric heating, oil or gas heating, which has problems such as high energy consumption (thermal efficiency of only 30%-60%), uneven heating (temperature difference can reach ±5℃ or more), and direct emission of exhaust gas that pollutes the environment. In addition, in low-temperature drying scenarios (such as agricultural products and medicinal materials), the materials are prone to deterioration. Utility Model Content
[0004] In view of the shortcomings of the existing technology, this utility model provides a low-temperature air-source heat pump dryer, which has the advantages of energy saving and environmental protection, and solves the problems of high energy consumption and high pollution of traditional dryers.
[0005] To achieve the above-mentioned goals of energy saving and environmental protection, this utility model provides the following technical solution: a low-temperature air energy dryer, including a dryer body, wherein a heat pump heating circulation mechanism is provided at the bottom of the dryer body; The heat pump heating circulation mechanism includes a cavity, an evaporator, a compressor, a condenser, and an expansion valve. A cavity is formed at the bottom inner part of the dryer body, and the evaporator, compressor, condenser, and expansion valve are housed inside the cavity. A main hot gas delivery pipeline extending to the outer walls of the left and right sides of the dryer body is located above the condenser. Furthermore, the outlet of the evaporator is connected to the suction port of the compressor via a pipe, the discharge port of the compressor is connected to the inlet of the condenser via a pipe, the outlet of the condenser is connected to the inlet of the expansion valve via a pipe, and the outlet of the expansion valve is connected to the inlet of the evaporator via a pipe.
[0006] Furthermore, a drying chamber is provided on the front side of the dryer body, and an exhaust pipe extending to the outside of the dryer body is provided on the rear inner wall of the drying chamber. A fan connected to the main hot gas conveying pipeline is provided on the rear side of the dryer body, and a high-efficiency heat exchanger is provided on the exhaust pipe. The high-efficiency heat exchanger is connected to the evaporator through a pipeline.
[0007] Furthermore, the left and right outer walls of the dryer body are provided with exhaust components extending into the drying chamber. The exhaust components include gas flow pipes and airflow nozzles. Gas flow pipes are fixedly installed on the left and right outer walls of the dryer body, and the two gas flow pipes are respectively connected to the two ports of the hot gas conveying main pipeline. An airflow nozzle extending into the drying chamber is provided on the side of the gas flow pipe near the dryer body.
[0008] Furthermore, the drying chamber is equipped with a rotatable material rack assembly, which includes bearings, a transmission rod, a servo motor, and material trays. Bearings are fixedly installed on the inner top and bottom walls of the drying chamber. The inner walls of the two bearings are fixedly connected to a transmission rod extending to the outer side of the top of the dryer body. A servo motor connected to the top of the transmission rod is fixedly installed on the top of the dryer body. Three material trays are arranged sequentially from top to bottom on the outer wall of the transmission rod.
[0009] Furthermore, a temperature sensor is installed inside the drying chamber, and two viewing doors are provided on the front side of the drying chamber. A controller is provided on the front side of the dryer body and above the viewing doors.
[0010] Compared with the prior art, the technical solution of this application has the following beneficial effects: 1. This low-temperature air-source heat pump dryer, through the setting of a heat pump heating circulation mechanism, firstly, the refrigerant evaporates in the evaporator, absorbing heat from the external environment or the exhaust gas of the drying system, becoming a low-temperature, low-pressure gaseous refrigerant. Then, the compressor does work on the gaseous refrigerant, significantly increasing its pressure and temperature, turning it into a high-temperature, high-pressure gaseous refrigerant. At the same time, the high-temperature, high-pressure refrigerant enters the condenser, releasing heat to the drying chamber while condensing itself into a high-pressure liquid refrigerant. Finally, the liquid refrigerant passes through the expansion valve, causing its pressure and temperature to drop sharply, becoming a low-temperature, low-pressure liquid refrigerant, which then re-enters the evaporator, completing one cycle. In summary, this mechanism achieves efficient heat transfer through the "reverse Carnot cycle," significantly outperforming traditional heating methods in terms of energy saving, environmental protection, temperature control accuracy, and system reliability, making it highly practical. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a front view of the structure of this utility model; Figure 3 This is a left sectional view of the structure of this utility model; Figure 4 This is a schematic diagram of the heat pump heating circulation mechanism of this utility model.
[0012] In the diagram: 1. Dryer body; 101. Drying chamber; 102. Exhaust gas emission pipe; 2. Heat pump heating circulation mechanism; 201. Cavity; 202. Evaporator; 203. Compressor; 204. Condenser; 205. Expansion valve; 206. Main hot gas conveying pipeline; 3. Emission assembly; 301. Gas flow pipe; 302. Airflow nozzle; 4. Fan; 5. High-efficiency heat exchanger; 6. Rotatable material rack assembly; 601. Bearing; 602. Transmission rod; 603. Servo motor; 604. Material tray; 7. Temperature sensor; 8. Visual door; 9. Controller. Detailed Implementation
[0013] 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.
[0014] Please see Figures 1-4 The low-temperature air-source dryer in this embodiment includes a dryer body 1, and a heat pump heating circulation mechanism 2 is provided at the bottom of the dryer body 1. The heat pump heating circulation mechanism 2 includes a cavity 201, an evaporator 202, a compressor 203, a condenser 204, and an expansion valve 205. A cavity 201 is formed at the bottom inner part of the dryer body 1. The evaporator 202, compressor 203, condenser 204, and expansion valve 205 are housed inside the cavity 201. The outlet of the evaporator 202 is connected to the suction port of the compressor 203 via a pipe. The exhaust port of the compressor 203 is connected to the inlet of the condenser 204 via a pipe. The outlet of the condenser 204 is connected to the inlet of the expansion valve 205 via a pipe. The outlet of the expansion valve 205 is connected to the inlet of the evaporator 202 via a pipe. A main hot gas delivery pipe 206 extending to the outer walls of the left and right sides of the dryer body 1 is provided above the condenser 204. First, the refrigerant enters the evaporator 202... The refrigerant evaporates in the middle, absorbing heat from the external environment or the exhaust gas of the drying system, and becomes a low-temperature, low-pressure gaseous refrigerant. Then, the compressor 203 does work on the gaseous refrigerant, causing its pressure and temperature to increase significantly, becoming a high-temperature, high-pressure gaseous refrigerant. At the same time, the high-temperature, high-pressure refrigerant enters the condenser 204 and releases heat to the drying chamber 101 through the cooperation of the hot gas transport main pipe 206 and the discharge component 3. Simultaneously, it condenses into a high-pressure liquid refrigerant. Finally, the liquid refrigerant is throttled by the expansion valve 205, causing its pressure and temperature to drop sharply, becoming a low-temperature, low-pressure liquid refrigerant, and re-enters the evaporator 202, completing one cycle. In summary, this mechanism achieves efficient heat transfer through the "reverse Carnot cycle," and is significantly superior to traditional heating methods in terms of energy saving, environmental protection, temperature control accuracy, and system reliability, making it highly practical.
[0015] In the implementation of the case, a drying chamber 101 is provided on the front side of the dryer body 1. An exhaust pipe 102 extending to the outside of the dryer body 1 is provided on the rear inner wall of the drying chamber 101. A fan 4 connected to the hot air conveying main pipe 206 is provided on the rear side of the dryer body 1. This design provides power for the circulation of hot air in the air duct. A high-efficiency heat exchanger 5 is provided on the exhaust pipe 102. The high-efficiency heat exchanger 5 is connected to the evaporator 202 through a pipe. The heat exchanger is a finned heat exchanger, which can absorb the waste heat in the exhaust gas and then transfer the heat to the evaporator 202 through the pipe, thereby improving the heat absorption efficiency of the evaporator 202, reducing the consumption of heat from the external environment, and further reducing energy consumption.
[0016] In the implementation of the case, exhaust components 3 extending into the drying chamber 101 are provided on the outer walls of both the left and right sides of the dryer body 1. The exhaust components 3 include gas flow pipes 301 and airflow nozzles 302. Gas flow pipes 301 are fixedly installed on the outer walls of both the left and right sides of the dryer body 1, and the two gas flow pipes 301 are respectively connected to the two ports of the hot gas conveying main pipeline 206. An airflow nozzle 302 extending into the drying chamber 101 is provided on the side of the gas flow pipe 301 closest to the dryer body 1. The airflow nozzles 302 are evenly distributed on the inner walls of the left and right sides of the drying chamber 101, with five on each side. This design allows the high-temperature gas to completely cover the drying chamber 101, ensuring that all parts of the material are heated evenly, thereby improving the drying quality and efficiency.
[0017] In the implementation of this case, a rotatable material rack assembly 6 is installed inside the drying chamber 101. The rotatable material rack assembly 6 includes a bearing 601, a transmission rod 602, a servo motor 603, and material trays 604. Bearings 601 are fixedly installed on the inner top and bottom walls of the drying chamber 101. The inner walls of the two bearings 601 are fixedly connected to the transmission rod 602, which extends to the outer side of the top of the dryer body 1. The top of the dryer body 1 is fixedly installed with a servo motor 603 connected to the top of the transmission rod 602. Three material trays 604 are arranged sequentially from top to bottom on the outer wall of the transmission rod 602. The material trays 604 adopt a hollow mesh structure. Through the cooperation of the servo motor 603 and the bearings 602, the transmission rod 602 can rotate stably. At the same time, the transmission rod 602 can drive the three material trays 604 to rotate. This design, together with the discharge assembly 3, can achieve all-round heating without dead angles. At the same time, the hollow structure is conducive to the penetration of hot air into the material layer and avoids local heat accumulation.
[0018] In the implementation of the case, a temperature sensor 7 is installed inside the drying chamber 101 to monitor the temperature inside the chamber. Two viewing doors 8 are provided on the front side of the drying chamber 101 to facilitate the staff to observe the drying process of the product. A controller 9 is provided on the front side of the dryer body 1 and above each viewing door 8. The controller 9 is electrically connected to the electronic components in this patent through wires, so as to facilitate the operation of the controller 9 to control the operation of the electronic components.
[0019] When implementing this procedure, please follow these steps: 1) First, place the material to be dried evenly on the hollow material tray 604 and close the visible door 8; 2) Then set the target temperature and drying time using controller 9; 3) Then start the equipment and the heat pump heating circulation mechanism 2 runs: the evaporator 202 absorbs the waste heat of the ambient exhaust gas, the compressor 203 compresses the refrigerant to generate high temperature hot gas, which is sent into the drying chamber 101 through the condenser 204, the hot gas conveying main pipeline 207 and the airflow nozzle 302. 4) Then the servo motor 603 drives the material tray 604 to rotate, the fan 4 promotes the circulation of hot air, and the temperature sensor 7 feeds back the temperature to the controller 9 in real time to dynamically adjust the system operation. 5) The waste gas generated during drying is discharged through the waste gas discharge pipe 102, and the high-efficiency heat exchanger 5 recovers the waste heat to the evaporator 202; 6) After the set time is reached, the equipment will automatically stop and the door will be opened to remove the material.
[0020] In summary, this low-temperature air-source heat pump dryer, through the installation of a heat pump heating circulation mechanism 2, firstly, the refrigerant evaporates in the evaporator 202, absorbing heat from the external environment or the exhaust gas of the drying system, becoming a low-temperature, low-pressure gaseous refrigerant. Then, the compressor 203 performs work on the gaseous refrigerant, significantly increasing its pressure and temperature, transforming it into a high-temperature, high-pressure gaseous refrigerant. Simultaneously, the high-temperature, high-pressure refrigerant enters the condenser 204 and releases heat into the drying chamber 101 through the cooperation of the hot gas delivery main pipe 206 and the discharge component 3, while simultaneously condensing itself into a high-pressure liquid refrigerant. Afterwards, the liquid refrigerant is throttled by the expansion valve 205, causing a sharp drop in pressure and temperature, transforming into a low-temperature, low-pressure liquid refrigerant, which then re-enters the evaporator 202, completing one cycle. In summary, this mechanism achieves efficient heat transfer through the "reverse Carnot cycle," significantly outperforming traditional heating methods in terms of energy saving, environmental protection, temperature control accuracy, and system reliability. It is highly practical, solving the problems of traditional drying equipment that rely heavily on electric heating, oil or gas heating, resulting in high energy consumption (thermal efficiency of only 30%-60%), uneven heating (temperature difference of ±5℃ or more), and direct emission of exhaust gas that pollutes the environment.
[0021] This invention employs a three-stage waste heat recovery system: the first stage involves a high-efficiency heat exchanger pre-cooling the waste gas and preheating the evaporator; the second stage involves the evaporator directly absorbing the sensible heat from the waste gas; and the third stage involves the condenser waste heat being returned to the drying chamber via a fan. Compared to conventional two-stage waste heat recovery systems, the overall energy saving rate is expected to increase by 15%-20%. The main hot gas delivery pipeline and emission components are independently zoned, ensuring both the main circulation airflow and facilitating zoned control of airflow intensity to adapt to different material characteristics. A front-opening visual door and a top-mounted maintenance access ensure both operational convenience and equipment maintainability. The material trays are spaced according to the golden ratio to maximize the loading capacity per unit volume. Dual-sided airflow nozzles and a rotating material rack create a three-dimensional heat field, which, combined with the perforated material trays, achieves penetrating heat exchange, solving the temperature difference problem inherent in traditional static drying. The dynamic rotation mechanism periodically changes the heated surface of the material, avoiding the risk of localized overheating. This invention fully realizes the four-step process of the "reverse Carnot cycle" (evaporation → compression → condensation → expansion), conforming to the thermodynamic logic of efficient heating.
[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0023] 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 air-source heat pump dryer, comprising a dryer body (1), characterized in that: The dryer body (1) is provided with a heat pump heating circulation mechanism (2) at its inner bottom. The heat pump heating circulation mechanism (2) includes a cavity (201), an evaporator (202), a compressor (203), a condenser (204), and an expansion valve (205). The dryer body (1) has a cavity (201) at its bottom. The cavity (201) contains an evaporator (202), a compressor (203), a condenser (204), and an expansion valve (205). The condenser (204) has a main hot air delivery pipe (206) extending to the outer walls of the left and right sides of the dryer body (1). The front side of the dryer body (1) is provided with a drying chamber (101), and the rear inner wall of the drying chamber (101) is provided with a waste gas discharge pipe (102) extending to the outside of the dryer body (1). The rear side of the dryer body (1) is provided with a fan (4) connected to the hot gas conveying main pipeline (206). The waste gas discharge pipe (102) is provided with a high-efficiency heat exchanger (5), and the high-efficiency heat exchanger (5) is connected to the evaporator (202) through a pipeline. The dryer body (1) has exhaust components (3) extending into the drying chamber (101) on both the left and right outer walls. The exhaust components (3) include a gas flow pipe (301) and an airflow nozzle (302). The dryer body (1) has a gas flow pipe (301) fixedly installed on both the left and right outer walls. The two gas flow pipes (301) are respectively connected to the two ports of the hot gas conveying main pipeline (206). The gas flow pipe (301) has an airflow nozzle (302) extending into the drying chamber (101) on the side near the dryer body (1). The drying chamber (101) is equipped with a rotatable material rack assembly (6), which includes a bearing (601), a transmission rod (602), a servo motor (603), and a material tray (604). The inner top and bottom walls of the drying chamber (101) are fixedly installed with bearings (601). The inner walls of the two bearings (601) are fixedly connected with a transmission rod (602) extending to the outer side of the top of the dryer body (1). The top of the dryer body (1) is fixedly installed with a servo motor (603) connected to the top of the transmission rod (602). The outer wall of the transmission rod (602) is provided with three material trays (604) from top to bottom.
2. The low-temperature air-source heat pump dryer according to claim 1, characterized in that: The outlet of the evaporator (202) is connected to the suction port of the compressor (203) through a pipe, the discharge port of the compressor (203) is connected to the inlet of the condenser (204) through a pipe, the outlet of the condenser (204) is connected to the inlet of the expansion valve (205) through a pipe, and the outlet of the expansion valve (205) is connected to the inlet of the evaporator (202) through a pipe.
3. The low-temperature air-source heat pump dryer according to claim 1, characterized in that: A temperature sensor (7) is installed inside the drying chamber (101). Two visible doors (8) are provided on the front side of the drying chamber (101). A controller (9) is provided on the front side of the dryer body (1) and above the visible doors (8).