Variable-frequency low-temperature air source constant-temperature dehumidification drying unit

Abstract

The utility model relates to the technical field of air source units, and discloses a variable-frequency low-temperature air source constant-temperature dehumidification drying unit which comprises a box body and a variable-frequency outdoor unit, an air return system and an air supply system are arranged in the two ends of the box body respectively, and the air return system feeds air in a drying room into the box body; the air supply system supplies high-temperature air into the drying room; an air heat exchange core is arranged in the box body, a fresh air system and a dehumidification system are arranged on the upper end face of the box body, and the air return system is matched with the fresh air system, so that fresh air and return air simultaneously pass through two vertical directions of the air heat exchange core of the box body; a heat exchanger and a reheater in the box body are arranged in the box body, and the heat exchanger and the reheater in the box body are connected with the frequency conversion outdoor unit. The method has the advantages that more electric energy is not consumed when the temperature of the drying room is kept, and the investment cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of air source units, in particular to a variable frequency low-temperature air source constant temperature dehumidification and drying unit. Background Art

[0002] Air-source dryers are widely used in daily life and production. Drying technology is used in a wide range of fields, including agricultural and sideline products, chemical materials, and industrial products. The development of air-source heat pump dryers has significantly transformed the drying industry, protecting the environment and ensuring safe production while also reducing production costs. They have gradually replaced heating methods that rely on combustion.

[0003] Air-source heat pump dryers utilize a compressor as their power source. Through the condensation and evaporation of a refrigerant, heat is transferred to the drying chamber. The hot air entering the drying chamber evaporates moisture from the product, which is then extracted by the unit's dehumidification and dehumidification functions. This process is significantly affected by the environment, making it difficult to maintain the drying chamber temperature, thus affecting production efficiency.

[0004] Air source heat pump dryers are commonly used in areas with high ambient temperatures. In low ambient temperature conditions, their energy efficiency is not high, or they cannot be started at all. Traditional units also have certain requirements for refrigerants to ensure high temperature heat pumps. The temperature control of fixed-frequency drying units fluctuates greatly, especially in areas with low ambient temperatures. The heating rate is slow, and after the unit is shut down when the temperature reaches the required level, it is difficult to maintain the drying room temperature due to the low external ambient temperature. In dehumidification mode, conventional air source units are in dehumidification mode, and the mixing of fresh air also causes energy waste and rapid temperature drop. In the dehumidification state, the conventional practice to maintain the drying room temperature is to add high-power electric heating, which increases investment costs and wastes electricity. Utility Model Content

[0005] 1. Technical Problems Solved

[0006] The technical problem to be solved by the utility model is that the existing air source heat pump dryer consumes more electric energy when maintaining the temperature of the drying room, thereby increasing the investment cost.

[0007] 2. Technical Solution

[0008] In order to solve the above technical problems, the utility model provides the following technical solutions: a variable frequency low temperature air source constant temperature dehumidification drying unit, comprising a box body and a variable frequency outdoor unit,

[0009] The two ends of the box are respectively provided with a return air system and an air supply system. The return air system sends the air in the drying room into the box, and the air supply system sends the high-temperature air into the drying room.

[0010] The air heat exchange core is arranged in the box body, the fresh air system and the dehumidification system are arranged on the upper end surface of the box body, the return air system cooperates with the fresh air system, so that the fresh air and the return air pass through the air heat exchange core in two vertical directions at the same time;

[0011] The box body is internally provided with a box body internal heat exchanger and a reheater, and the box body internal heat exchanger and the reheater are connected with a variable frequency outdoor unit.

[0012] Further, the box body internal heat exchanger and the reheater are arranged in parallel in the box body.

[0013] Further, the reheater is communicated with the variable frequency outdoor unit through a four-way valve.

[0014] Further, the return air system and the air supply system are staggered and distributed on the upper and lower end surfaces of the box body.

[0015] Further, the variable frequency outdoor unit has two, and the two variable frequency outdoor units are respectively communicated with the box body internal heat exchanger and the reheater.

[0016] III. Advantages

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] Ensure that the unit normally operates under low temperature, and unload the compressor under high temperature, reduce the start and stop of the unit, reduce the temperature fluctuation of the drying room; increase the air heat exchange core, open the fresh air system under the dehumidification mode, the outside air enters the box body, exchanges heat with the return air of the return air system to improve the temperature of the fresh air, reduce the humidity of the return air, reduce the heat loss, and improve the efficiency; in the dehumidification state, increase the reheating system, reduce the electric heating power. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The structure of the utility model is shown in the figure;

[0020] Fig. 1, box body; 2, return air system; 3, box body internal heat exchanger; 4, reheater; 5, air supply system; 6, variable frequency outdoor unit; 7, fresh air system; 8, dehumidification system; 9, air heat exchange core. DETAILED DESCRIPTION

[0021] The technical scheme in the embodiments of the utility model will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0022] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0023] In addition, the terms "first," "second," and so on, used in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] The present invention will now be further described with reference to the accompanying drawings.

[0026] Example

[0027] Combined with attachment Figure 1 When the equipment is running, the variable frequency compressor of the variable frequency outdoor unit 6 enters variable frequency regulation, and discharges the high-temperature gaseous refrigerant into the heat exchanger 3 in the box through the pipeline. At the same time, the return air system 2 sends the air in the drying room into the box 1, flows through the heat exchanger 3 in the box, and increases the air temperature; then the high-temperature air is sent into the drying room through the air supply system 5; when the set temperature is about to be reached, the compressor in the variable frequency outdoor unit 3 will reduce the speed to maintain the temperature of the drying room, so as to avoid frequent start and stop, which causes fluctuations in the drying temperature.

[0028] In the dehumidification mode, the outside air enters the box through the fresh air system 7, and at the same time the return air system 2 introduces the humid air in the drying room into the box 1. The fresh air and the return air pass through the two vertical directions of the air heat exchange core 9 of the box at the same time for heat exchange, and then enter the box 1 for mixing. The humid air is discharged from the box through the dehumidification system 8, and the heated fresh air enters the drying room through the air supply system 5, reducing energy loss and reducing temperature fluctuations.

[0029] In dehumidification mode, the variable frequency compressor of the variable frequency outdoor unit 6 sends the compressed high-temperature gaseous refrigerant to the reheater 4 in the box through the four-way valve for heat recovery, and then enters the outdoor heat exchanger of the variable frequency outdoor unit 6. Finally, the refrigerant passes through the heat exchanger 3 in the box and returns to the variable frequency compressor of the variable frequency outdoor unit 6, completing the refrigeration cycle. At the same time, the water molecules in the humid air drawn back by the return air system 2 condense into water through the heat exchanger 3 in the box, reducing the relative humidity of the air. After passing through the heat exchanger 3 in the box, the temperature of the air will drop. Then, it will be heated by the reheater 4 and electric heating, and then sent to the drying room through the air supply system (5), and then enter the next round of drying, dehumidification, and dehumidification processes, and so on.

[0030] The utility model and its embodiments are described in this disclosure. This description is not restrictive. The drawings show only one embodiment of the utility model, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this disclosure and, without departing from the purpose of the utility model, designs a structure and embodiment similar to the technical solution without inventiveness, they shall fall within the scope of protection of the utility model.

Claims

1. A variable frequency low temperature air source constant temperature dehumidification and drying unit, comprising a cabinet and a variable frequency outdoor unit, characterized in that: The two ends of the box are respectively provided with a return air system and an air supply system. The return air system sends the air in the drying room into the box, and the air supply system sends the high-temperature air into the drying room. An air heat exchange core is provided in the box body, and a fresh air system and a dehumidification system are provided on the upper end surface of the box body. The return air system cooperates with the fresh air system so that the fresh air and the return air pass through the two vertical directions of the air heat exchange core of the box body at the same time; An internal heat exchanger and a reheater are provided in the box body, and the internal heat exchanger and the reheater are connected to the variable frequency outdoor unit.

2. A variable frequency low temperature air source constant temperature dehumidification and drying unit according to claim 1, characterized in that: The in-box heat exchanger and the reheater are arranged in parallel in the box.

3. A variable frequency low temperature air source constant temperature dehumidification and drying unit according to any one of claims 1 or 2, characterized in that: The reheater is communicated with the variable frequency outdoor unit through a four-way valve.

4. The variable frequency low temperature air source constant temperature dehumidification and drying unit according to claim 1, characterized in that: The return air system and the supply air system are staggered and distributed up and down on the end surfaces at both ends of the box.

5. The variable frequency low temperature air source constant temperature dehumidification and drying unit according to claim 1, characterized in that: There are two variable frequency outdoor units, and the two variable frequency outdoor units are respectively connected to the heat exchanger and the reheater in the box.

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