Heat pump system for drying equipment

Abstract

The utility model relates to the technical field of agricultural product drying, and discloses a heat pump system for drying equipment, the heat pump system comprises a case, an air mixing cavity, an air return channel and a heat pump, a fresh air fan and an exhaust fan are arranged on the case, and an air return fan is arranged in the air return channel; high-temperature and high-humidity airflow exhausted by the humidity exhaust channel is mixed with environment fresh air and then cooled and dehumidified through the evaporator, the dehumidified first mixed airflow is divided into two strands, one strand of airflow is exhausted out of the machine box through the exhaust outlet, the other strand of airflow passes through the air return channel to form return air, and the return air is heated by the condenser and then returns into the drying cavity through the air inlet channel. And cyclic heating of the materials in the drying cavity is achieved. Besides, a function relation expression among the control air volume of the air return fan, the environment new house flow and the environment fresh air temperature can be constructed by utilizing test data, so that the air volume of the air return fan is accurately adjusted in real time, and the air inlet temperature in the air inlet channel of the drying cavity is ensured to meet the design temperature requirement.

Description

Technical Field

[0001] This utility model relates to the field of agricultural product drying technology, specifically to a heat pump system for drying equipment. Background Technology

[0002] In traditional heat pump drying equipment, although the incoming ambient fresh air mixes and exchanges heat with the high-temperature, high-humidity return air in the drying chamber, then undergoes dehumidification and cooling via the evaporator, and is subsequently heated by the condenser before being sent into the drying chamber to heat and dry the materials, existing drying equipment lacks a precise mechanism for adjusting the return air volume based on the fresh air temperature and flow rate. This results in significant temperature fluctuations within the drying chamber. Utility Model Content

[0003] In view of this, the present invention provides a heat pump system for drying equipment, which can realize real-time and precise adjustment of the air volume of the return air fan to ensure that the air inlet temperature in the air inlet channel of the drying chamber meets the design temperature requirements.

[0004] To achieve the above technical effects, this utility model provides a heat pump system for drying equipment, comprising:

[0005] The chassis is equipped with a fresh air inlet, an exhaust outlet, an air inlet channel, and a dehumidification channel. The fresh air inlet is equipped with a temperature sensor and a fresh air fan. The temperature sensor is used to obtain the temperature of the ambient fresh air. The exhaust outlet is equipped with an exhaust fan. The air inlet channel is used to provide drying airflow to the drying chamber. The dehumidification channel is used to exhaust the high-temperature and high-humidity gas in the drying chamber to the outside of the drying chamber.

[0006] A mixing chamber is provided inside the chassis. The fresh air inlet and the dehumidification channel are both connected to the air inlet of the mixing chamber. The exhaust port is provided at the chassis position corresponding to the mixing chamber.

[0007] A return air duct, one end of which is connected to the air outlet of the mixing chamber, and the other end of which is connected to the air inlet duct, and a return air fan is installed inside the return air duct;

[0008] A heat pump, comprising a compressor, a condenser, an expansion valve, and an evaporator forming a circulation loop; the evaporator is disposed between the air inlet and the air outlet of the mixing chamber, and the condenser is disposed within a return air duct, the condenser being used to heat the airflow entering the return air duct.

[0009] Furthermore, the exhaust vent and the return air duct are spaced apart along the length of the chassis.

[0010] Furthermore, the heat pump has at least two sets, with the evaporator of each set of heat pumps connected in series in the mixing chamber, and the condenser of each set of heat pumps connected in series in the return air duct.

[0011] Furthermore, an electric auxiliary heating mechanism is also provided upstream of the air inlet channel, and a control switch for controlling the opening and closing of the electric auxiliary heating mechanism is also provided on the electric auxiliary heating mechanism.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. This utility model utilizes a fresh air fan, an exhaust fan, a return air fan, and a heat pump. Ambient fresh air enters the casing through the fresh air inlet. The high-temperature, high-humidity airflow discharged from the dehumidification channel mixes with the incoming ambient fresh air to form a first mixed airflow that enters the evaporator for cooling and dehumidification. After dehumidification, the first mixed airflow is divided into two streams. One stream exits the casing through the exhaust vent, while the other stream passes through the return air channel to form return air. This return air is heated by the condenser to form high-temperature, low-humidity return air that returns to the drying chamber through the air inlet channel, thus achieving cyclic heating of the materials within the drying chamber. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the heat pump system used in the drying equipment in the embodiment;

[0016] The components include: 1. Chassis; 2. Fresh air inlet; 3. Exhaust outlet; 4. Air intake duct; 5. Dehumidification duct; 6. Mixing chamber; 7. Return air duct; 8. Condenser; 9. Evaporator; and 10. Electric auxiliary heating mechanism. Detailed Implementation

[0017] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0018] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] Example

[0020] See Figure 1 A heat pump system for a drying equipment, comprising:

[0021] The chassis 1 is provided with a fresh air inlet 2, an exhaust vent 3, an air intake channel 4, and a dehumidification channel 5. The fresh air inlet 2 is provided with a temperature sensor and a fresh air fan. The temperature sensor is used to obtain the temperature of the ambient fresh air. The exhaust vent 3 is provided with an exhaust fan. The air intake channel 4 is used to provide drying airflow to the drying chamber. The dehumidification channel 5 is used to exhaust the high temperature and high humidity gas in the drying chamber to the outside of the drying chamber.

[0022] Mixing chamber 6 is disposed inside the chassis 1. The fresh air inlet 2 and the dehumidification channel 5 are both connected to the air inlet of the mixing chamber 6. The exhaust port 3 is disposed at the position of the chassis 1 corresponding to the mixing chamber 6.

[0023] Return air duct 7, one end of which is connected to the air outlet of mixing chamber 6, and the other end of which is connected to air inlet duct 4, and a return air fan is installed inside the return air duct 7;

[0024] A heat pump, comprising a compressor, a condenser 8, an expansion valve, and an evaporator 9 forming a circulation loop; the evaporator 9 is disposed between the air inlet end and the air outlet end of the mixing chamber 6, and the condenser 8 is disposed in the return air passage 7, the condenser 8 being used to heat the airflow entering the return air passage 7.

[0025] In this embodiment, the air inlet of the drying chamber is connected to the air inlet channel, and the exhaust end of the drying chamber is connected to the dehumidification channel 5. During the material drying process, by turning on the fresh air fan, exhaust fan, return air fan, and heat pump, ambient fresh air enters the casing 1 through the fresh air inlet 2, and the airflow in the drying chamber is discharged through the dehumidification channel 5. The high-temperature and high-humidity airflow discharged from the dehumidification channel 5 mixes with the ambient fresh air entering through the fresh air inlet 2 to form a first mixed airflow that enters the evaporator 9 for cooling and dehumidification. The first mixed airflow after dehumidification is divided into two streams. One stream is discharged from the exhaust port 3 outside the casing 1, and the other stream passes through the return air channel 7 to form return air. The return air is heated by the condenser 8 to form high-temperature and low-humidity return air that returns to the drying chamber through the air inlet channel 4, thereby realizing the circulating heating of the material in the drying chamber.

[0026] In this embodiment, the exhaust port 3 and the return air channel 7 are spaced apart along the length of the casing 1, so that the airflow from the outlet of the evaporator 9 enters the corresponding channel respectively without interfering with each other, and can maintain the stability of the return airflow of the entire drying equipment, without causing the problem of excessively high or low local return airflow.

[0027] In this embodiment, there are at least two sets of heat pumps. The evaporators 9 of each set of heat pumps are connected in series in the mixing chamber 6, and the condensers 8 of each set of heat pumps are connected in series in the return air channel 7. This allows the first mixed airflow in the mixing chamber 6 to exchange heat with one of the evaporators 9 before exchanging heat with the other evaporator 9 connected in series. By matching and designing the relevant parameters of the two sets of evaporators 9 in the same mixing chamber 6, such as setting different circulating media in the two sets of evaporators 9 connected in series, the heat exchange efficiency of the evaporator 9 can be matched with the corresponding inlet airflow temperature, thereby improving the heat exchange efficiency and ensuring the dehumidification effect.

[0028] In this embodiment, an electric auxiliary heating mechanism 10 is also provided upstream of the air inlet channel 4. The electric auxiliary heating mechanism 10 is also provided with a control switch to control the opening and closing of the electric auxiliary heating mechanism 10. When the ambient fresh air temperature is low and the condenser 8 cannot meet the temperature requirements inside the air inlet channel 4, the electric auxiliary heating mechanism 10 can be turned on to heat the airflow in the air inlet channel, further ensuring that the air inlet temperature inside the air inlet channel 4 of the drying chamber meets the design temperature requirements.

[0029] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A heat pump system for drying equipment, characterized in that, include: The chassis is equipped with a fresh air inlet, an exhaust outlet, an air inlet channel, and a dehumidification channel. The fresh air inlet is equipped with a temperature sensor and a fresh air fan. The temperature sensor is used to obtain the temperature of the ambient fresh air. The exhaust outlet is equipped with an exhaust fan. The air inlet channel is used to provide drying airflow to the drying chamber. The dehumidification channel is used to exhaust the high-temperature and high-humidity gas in the drying chamber to the outside of the drying chamber. A mixing chamber is provided inside the chassis. The fresh air inlet and the dehumidification channel are both connected to the air inlet of the mixing chamber. The exhaust port is provided at the chassis position corresponding to the mixing chamber. A return air duct, one end of which is connected to the air outlet of the mixing chamber, and the other end of which is connected to the air inlet duct, and a return air fan is installed inside the return air duct; A heat pump, comprising a compressor, a condenser, an expansion valve, and an evaporator forming a circulation loop; the evaporator is disposed between the air inlet and the air outlet of the mixing chamber, and the condenser is disposed within a return air duct, the condenser being used to heat the airflow entering the return air duct.

2. The heat pump system for drying equipment according to claim 1, characterized in that, The exhaust vents and the return air ducts are spaced apart along the length of the chassis.

3. The heat pump system for drying equipment according to claim 1, characterized in that, The heat pump has at least two sets, with the evaporator of each set of heat pumps connected in series in the mixing chamber, and the condenser of each set of heat pumps connected in series in the return air duct.

4. The heat pump system for drying equipment according to claim 1, characterized in that, An electric auxiliary heating mechanism is also provided upstream of the air inlet channel, and a control switch for controlling the opening and closing of the electric auxiliary heating mechanism is also provided on the electric auxiliary heating mechanism.

Images