Closed-loop heat pump dryer for iced persimmons

Abstract

The utility model discloses an ice persimmon closed-loop heat pump dryer which comprises a drying chamber and a heat exchange system, and the drying chamber is provided with an air valve and a fan; the heat exchange system comprises a compressor, a condenser set, an electronic expansion valve and an evaporator which are sequentially connected and form a refrigerant circulation loop. The drying chamber has a high-temperature mode and a low-temperature mode, when the drying chamber is in the high-temperature mode, the air valve is closed, and when the drying chamber is in the low-temperature mode, the air valve is opened. Due to the indoor condenser and the outdoor condenser, the drying chamber can be flexibly switched between a high-temperature mode and a low-temperature mode, and the alternate operation mode not only can quickly and uniformly remove moisture in the persimmons, but also effectively reduces the tannin content in the persimmons. An air valve is arranged in the drying chamber and can change the flow direction of air in the drying chamber according to the working mode. Air flows through the heat regenerator twice and is heated / cooled, and the humidity is rapidly reduced in the process.

Description

Technical Field

[0001] This utility model relates to the field of drying technology, specifically a closed-loop heat pump dryer for persimmons. Background Technology

[0002] Persimmons are one of my country's main fruits. Fresh persimmons are rich in fiber, calcium, vitamin C, carotene, sugar, protein, and trace elements such as iron and iodine, making them popular with consumers. However, fresh persimmons have a short harvesting period and soften easily at room temperature after picking, making them inconvenient to store and transport. Therefore, growers usually process persimmons into dried persimmons to extend their shelf life and shelf time. Currently, there are two methods for processing dried persimmons: natural drying and artificial drying. Natural drying requires manual sun-drying, which is labor-intensive and has poor hygiene. Artificial drying, using heat pumps, can effectively improve the hygiene and production efficiency of dried persimmons.

[0003] Ice persimmon is a new type of persimmon processing method. Ice persimmon has the characteristics of good taste, less astringency, and long shelf life. Moreover, ice persimmon has high technical content and novel taste, and is a deep processing method of persimmon.

[0004] In traditional heat pump drying equipment, the heat pump dryer can only provide dehumidification or drying effects, and cooling of the drying chamber can only be achieved through ventilation or natural cooling. In the production of frozen persimmons, in order to eliminate the tannins in the persimmons, the persimmons need to undergo multiple cycles of high-temperature baking and low-temperature baking. However, traditional heat pump dryers cannot quickly provide a low-temperature baking environment. Therefore, it is necessary to develop a frozen persimmon processing equipment that can handle both high-temperature and low-temperature baking. Utility Model Content

[0005] Therefore, in order to solve the above problems, the purpose of this utility model is to provide a closed-loop heat pump dryer for persimmons, comprising:

[0006] The drying chamber is equipped with air valves and a fan;

[0007] A heat exchange system, comprising a compressor, a condenser assembly, an electronic expansion valve, and an evaporator connected in sequence to form a refrigerant circulation loop, wherein the condenser assembly comprises an indoor condenser and an outdoor condenser, and the indoor condenser is located in a drying chamber;

[0008] The drying chamber has a high-temperature mode and a low-temperature mode. When the drying chamber is in high-temperature mode, the air valve is closed and the fan blows air to form a circulating heating air duct. The path of the heating air duct is: indoor condenser, regenerator, evaporator, regenerator, indoor condenser. When the drying chamber is in low-temperature mode, the air valve is open and the fan blows air to form a circulating cooling air duct. The path of the cooling air duct is: indoor condenser, air valve, evaporator, regenerator, indoor condenser.

[0009] Preferably, the air valve is located in the middle of the drying chamber, and the regenerator, fan, evaporator and indoor condenser constitute a set of indoor components. Two sets of indoor components are symmetrically arranged in the drying chamber along the air valve.

[0010] Preferably, the compressor is connected to the indoor condenser and the outdoor condenser via a three-way valve.

[0011] The beneficial effects of this utility model are:

[0012] The indoor and outdoor condensers of this invention allow the drying chamber to flexibly switch between high-temperature and low-temperature modes. This alternating operation mode not only removes moisture from the persimmons quickly and evenly, but also effectively reduces the tannin content in the persimmons.

[0013] The drying chamber has an internal air valve that can change the direction of airflow according to the operating mode. This causes the air to flow through the regenerator twice, heating / cooling it and rapidly reducing humidity in the process. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. 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 present invention in the heating and drying mode;

[0016] Figure 2 This is a schematic diagram of the present invention in the cooling mode;

[0017] The following are the symbols and their meanings: 1. Compressor; 2. Three-way valve; 3. Outdoor condenser; 4. Indoor condenser; 5. Electronic expansion valve; 6. Evaporator; 7. Regenerator; 8. Air valve.

[0018] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0020] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] Example 1:

[0023] Figures 1-2 This invention provides a closed-loop heat pump dryer for persimmons, including a drying chamber and a heat exchange system. The drying chamber is equipped with an air valve 8 and a fan. The fan blows air into the drying chamber to form a circulating air duct. The air valve 8 can change the airflow direction by opening / closing. The heat exchange system includes a compressor 1, a condenser group, an electronic expansion valve 5, and an evaporator 6 connected in sequence, forming a circulating loop for refrigerant flow. The condenser group includes an indoor condenser 4 and an outdoor condenser 3. The indoor condenser 4 is located in the drying chamber.

[0024] The drying chamber has two operating modes: high temperature mode and low temperature mode. In high temperature mode, the air valve 8 is closed, and the fan blows air to form a circulating heating air duct. The heating air duct path is: indoor condenser 4, regenerator 7, evaporator 6, regenerator 7, indoor condenser 4. The refrigerant circulation loop is: compressor 1, indoor refrigerator, electronic expansion valve 5, evaporator 6. In low temperature mode, the air valve 8 is open, and the fan blows air to form a circulating cooling air duct. The cooling air duct path is: indoor condenser 4, air valve 8, evaporator 6, regenerator 7, indoor condenser 4. The refrigerant circulation loop is: compressor 1, outdoor refrigerator, electronic expansion valve 5, evaporator 6.

[0025] The fan is located near the indoor condenser 4. When the drying chamber is in high-temperature mode, the air valve 8 is closed, and the circulating air in the chamber blows out from the indoor condenser 4 to form the drying chamber return air. The drying chamber return air is initially cooled by the regenerator 7, and then flows to the evaporator 6. The evaporator 6 cools and dehumidifies the air before it flows back to the regenerator 7 to form low-temperature return air. At this time, the low-temperature return air exchanges heat with the drying chamber return air that was just blown out of the drying chamber. The low-temperature return air is heated and then flows to the indoor condenser 4, where it is further heated and the humidity is reduced. Finally, it is blown out again by the fan to form the next circulation air. When the drying chamber is in low-temperature mode, the air valve 8 is opened, and the circulating air in the chamber blows out from the indoor condenser 4 to form the drying chamber return air. The drying chamber return air passes through the open air valve 8 directly to the evaporator 6, then flows through the regenerator 7 and finally returns to the indoor condenser 4. It is then blown out by the fan to form the next circulation air. When the refrigerant flows through the evaporator 6, it absorbs the heat of the drying chamber return air and then dissipates the heat at the outdoor condenser 3.

[0026] In this embodiment, two drying chambers are combined together, and a damper 8 is placed between the two drying chambers. Two heat exchange systems are configured accordingly and arranged symmetrically along the damper 8. The reasonable arrangement of the damper 8 can save the number of dampers 8 used and reduce the manufacturing cost of the equipment.

[0027] In the heat exchange system, compressor 1 is connected to indoor condenser 4 and outdoor condenser 3 respectively through a three-way valve 2.

[0028] The following methods are used to control the air valves 8 and fans in the heat exchange system and drying chamber:

[0029] First, peel and wash the persimmons, then place them in the drying chamber. Adjust the drying chamber to high temperature mode and bake the persimmons for x hours. Then, adjust it to low temperature mode and bake the persimmons for x hours. Alternate between high temperature and low temperature modes until the persimmons reach the required humidity to complete the drying process.

[0030] In this embodiment, after multiple experimental calculations, it was found that when the number of cycles was 16, x = 0.5, the high-temperature mode was set at 45°C, and the low-temperature mode was set at 18°C, the drying effect of the persimmons was better, with a total drying time of 8 hours. Examples are as follows:

[0031] Set a time T, and set 16 sequentially arranged time nodes T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, and T16. The interval between any two time nodes is 0.5 hours. The high-temperature mode time period in the drying chamber is as follows:

[0032] [0~T1,T2~T3,T4~T5,T6~T7,T8~T9,T10~T11,T12~T13,T14~T15];

[0033] The low temperature mode duration is:

[0034] [T1~T2, T3~T4, T5~T6, T7~T8, T9~T10, T11~T12, T13~T14, T15~T16];

[0035] After completing the above time period operations, the air valve 8, fan, and heat exchange system will stop.

[0036] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A closed-loop heat pump dryer for persimmons, characterized in that, include: The drying chamber is equipped with air valves and a fan; A heat exchange system, comprising a compressor, a condenser assembly, an electronic expansion valve, and an evaporator connected in sequence to form a refrigerant circulation loop, wherein the condenser assembly comprises an indoor condenser and an outdoor condenser, and the indoor condenser is located in a drying chamber; The drying chamber has a high-temperature mode and a low-temperature mode. When the drying chamber is in high-temperature mode, the air valve is closed, and when the drying chamber is in low-temperature mode, the air valve is open.

2. The closed-loop heat pump dryer for persimmons according to claim 1, characterized in that, The air valve is located in the middle of the drying chamber. The regenerator, fan, evaporator and indoor condenser constitute a set of indoor components. Two sets of indoor components are symmetrically arranged in the drying chamber along the air valve.

3. The persimmon closed-loop heat pump dryer according to claim 1, characterized in that, The compressor is connected to the indoor condenser and the outdoor condenser via a three-way valve.

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