CN206875857U - A kind of tiny structure low temperature drying device - Google Patents

Abstract

The utility model relates to a micro-negative pressure low-temperature drying device. The device introduces a micro-negative pressure environment into a drying chamber, and can quickly dry materials at a relatively low temperature. The recirculating airflow is cooled and dehumidified first by a dehumidifier, and then an independent dehumidifier is used to further dehumidify the low-temperature saturated airflow, and then the condenser of the heat pump unit is used to raise the temperature of the airflow and introduce it into a negative pressure drying room. The regeneration of the dehumidifier in this process can be applied to a variety of clean and efficient Energy, such as solar energy, geothermal energy, industrial waste heat, etc., the condensation and evaporation heat of the heat pump have been rationally utilized at the same time, the overall drying energy consumption is much lower than that of ordinary drying devices, and its drying speed and drying effect are excellent, especially suitable for Chinese herbal medicine, health care products, Seeds, high-grade agricultural products, seafood products and other materials that are extremely sensitive to drying temperature and cannot destroy their active ingredients.

Description

A micro-negative pressure low-temperature drying device

technical field

The utility model relates to a micro-negative pressure low-temperature drying device. The device introduces a micro-negative pressure environment into a drying chamber, and can quickly and efficiently dry materials at a relatively low temperature (30-50°C), and is especially suitable for Chinese herbal medicines, health care products, High-grade agricultural products and other materials that are extremely sensitive to drying temperature and cannot destroy their active ingredients, this technical method belongs to the field of post-processing of raw materials and energy conservation and environmental protection.

Background technique

Drying technology is widely used in chemical, pharmaceutical, food, biology, materials, agricultural and sideline product processing, coal and wood processing and other industries. The most commonly used drying method is hot air convection drying. Generally, under normal pressure, hot air with a higher temperature after heating is used to flow over the surface of the material to be dried to take away moisture. However, this method consumes a lot of water when heating the air. Energy, drying energy efficiency is low, and due to the high temperature, it is not suitable for some heat-sensitive materials with high added value, such as: Chinese herbal medicine, health care products, seeds, high-end agricultural products, seafood products, etc. Therefore, it is necessary to design a high-efficiency drying device and drying process for these high-value-added heat-sensitive materials to ensure low energy consumption and improve drying efficiency without damaging the active ingredients of the materials.

Utility model content

The utility model provides a micro-negative pressure low-temperature drying device in order to solve the problems of high energy consumption, damage to the material during the drying process, and low drying efficiency when conventional hot air dries heat-sensitive materials with high added value.

In order to solve the above technical problems, the utility model proposes the following technical solutions: a micro-negative pressure low-temperature drying device, which includes a drying chamber, a drying plate is arranged inside the drying chamber, and the bottom of the drying chamber is connected to a heat pump unit internal condensation The internal condenser of the heat pump unit is connected with the internal compressor of the heat pump unit, the internal evaporator of the heat pump unit and the gas plate heat exchanger at the same time; the top of the drying chamber is connected with the gas plate heat exchanger through a circulating fan; the heat pump A dehumidifier is also installed between the internal evaporator of the unit and the gas plate heat exchanger; an air duct regulating valve and a pressure vacuum gauge are installed on the pipeline between the internal condenser of the heat pump unit and the drying chamber; A throttling expansion valve inside the heat pump unit is installed on the pipeline between the heat pump unit and the internal evaporator.

The pressure vacuum gauge can detect the negative pressure value inside the drying chamber.

The heat pump unit may be an ordinary electric-driven heat pump unit, or a lithium bromide absorption heat pump unit driven by solar energy.

The dehumidifier can be a rotary dehumidifier or a solution dehumidifier.

The air pipe regulating valve can adjust the pressure in the drying chamber so that it is in a slight negative pressure during operation.

The regeneration of the dehumidifier can use a variety of clean and efficient energy sources, such as solar energy, geothermal energy, and industrial waste heat.

The operating drying temperature of the drying device is 30~50°C.

The gas plate heat exchanger can preheat the circulating air after the secondary dehumidification, and at the same time precool the hot and humid circulating air discharged from the drying chamber.

The utility model has the following beneficial effects:

1. A micro-negative pressure low-temperature drying device, which can quickly dry and dehydrate materials under low-temperature and micro-negative pressure conditions. The drying process uses a circulating airflow drying method. The evaporator of the heat pump unit is used to cool down the circulating airflow and dehumidify it first. Then use an independent dehumidifier to further dehumidify the low-temperature saturated airflow, and then use the condenser of the heat pump unit to raise the temperature of the secondary dehumidified airflow to reduce the relative humidity of the airflow to below 5% and introduce it into a micro-negative pressure drying room.

2. The regeneration of the dehumidifier in this process can use a variety of clean and efficient energy sources, such as solar energy, geothermal energy, industrial waste heat, etc. The condensation and evaporation heat of the heat pump have been rationally utilized at the same time, and the overall drying energy consumption is much lower than that of ordinary drying devices. Its drying speed and drying effect are excellent, especially suitable for Chinese herbal medicine, health care products, seeds, high-grade agricultural products, seafood products and other materials that are extremely sensitive to drying temperature and cannot destroy their active ingredients.

3. Due to the use of a micro-negative pressure drying environment, the vaporization temperature of the moisture in the material is reduced to a certain extent, which can reduce the drying temperature under the condition that the drying rate does not change much, that is, achieve low-temperature drying that meets the non-destructive drying conditions of specific materials, so for The heating energy consumption of the drying air flow can be effectively reduced.

4. In the drying process, the precooling of the high-humidity circulating airflow at the outlet of the drying chamber and the preheating of the circulating airflow after the secondary dehumidification are realized without external energy, which further reduces the operating energy consumption and greatly improves the overall drying efficiency. system energy efficiency.

5. The operating drying temperature of the drying device is generally 30~50°C, and the device is not limited to the drying temperature of 30~50°C, and other drying temperatures can also be used by changing the operating parameters.

6. The gas plate heat exchanger is used to preheat the circulating air after the secondary dehumidification, and at the same time pre-cool the high-humidity circulating air discharged from the drying chamber, so as to improve the overall operating energy efficiency.

7. The air duct regulating valve can adjust the pressure in the drying chamber so that it is in an appropriate micro-negative pressure during operation, so as to increase the rate of water analysis in the material to be dried and effectively reduce the temperature required for drying.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Figure 1 is a schematic diagram of the overall structure of the utility model.

In the figure: 1—compressor inside the heat pump unit, 2—condenser inside the heat pump unit, 3—air pipe regulating valve, 4—drying room, 5—circulating fan, 6—gas plate heat exchanger, 7—dehumidifier, 8 —The internal evaporator of the heat pump unit, 9—the throttling expansion valve inside the heat pump unit, 10—the drying plate, 11—the pressure vacuum gauge.

detailed description

Embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

Example 1:

As shown in Figure 1, a kind of micro negative pressure low-temperature drying device, it comprises drying room 4, and described drying room 4 interior is provided with drying plate 10, and the bottom of described drying room 4 communicates with the internal condenser 2 of heat pump unit, so The internal condenser 2 of the heat pump unit is simultaneously connected with the internal compressor 1 of the heat pump unit, the internal evaporator 8 of the heat pump unit, and the gas plate heat exchanger 6; the top of the drying chamber 4 is connected with the gas plate heat exchanger 6 through a circulating fan 5 A dehumidifier 7 is also installed between the internal evaporator 8 of the heat pump unit and the gas plate heat exchanger 6; an air duct regulating valve 3 and Pressure and vacuum gauge 11; a throttling expansion valve 9 inside the heat pump unit is installed on the pipeline between the internal condenser 2 of the heat pump unit and the internal evaporator 8 of the heat pump unit.

Further, the pressure vacuum gauge 11 can detect the negative pressure value inside the drying chamber 4 . The value of the micro negative pressure can be adjusted flexibly and can be read through the pressure vacuum gauge.

Further, the heat pump unit may be an ordinary electric-driven heat pump unit, or a lithium bromide absorption heat pump unit driven by solar energy.

Further, the dehumidifier 7 can be a rotary dehumidifier or a solution dehumidifier. The circulating air can be dehumidified by the dehumidifier 7 to obtain dry air, which is convenient for subsequent drying.

Further, the air duct regulating valve 3 can adjust the pressure in the drying chamber 4 so that it is at a slight negative pressure during operation. Improve the rate of water analysis in the material to be dried, and effectively reduce the temperature required for drying.

Further, the regeneration of the dehumidifier can use a variety of clean and efficient energy sources, such as solar energy, geothermal energy, and industrial waste heat. Thus effectively reducing energy consumption.

Further, the operating drying temperature of the drying device is 30-50°C. And the device is not limited to the drying temperature of 30-50°C, and other drying temperatures can also be used by changing the operating parameters.

Further, the gas plate heat exchanger 6 can preheat the circulating airflow after the secondary dehumidification, and at the same time precool the high-humidity circulating airflow discharged from the drying chamber 4 . Improve overall operating energy efficiency.

Example 2:

The drying process of any micro-negative pressure low-temperature drying device includes the following steps:

Step1: The low-temperature and low-humidity circulating airflow enters the drying chamber 4 to quickly absorb moisture and dry the materials to be dried evenly arranged on the drying trays 10 of each layer;

Step2: The circulating air flow absorbs moisture and dries the material and becomes a hot and humid circulating air flow, and leaves the drying chamber under the suction of the circulating fan 5, and enters the gas plate heat exchanger 6 and the circulating air flow after the secondary dehumidification in the second stage Perform heat exchange to achieve pre-cooling of the hot and humid circulating air leaving the drying chamber;

Step3: The circulating air flow after precooling leaves the gas plate heat exchanger 6 and enters the internal evaporator 8 of the heat pump unit. The heat released in the evaporator greatly reduces the temperature and condenses and precipitates the moisture in the air flow, which is the circulating air flow after the first-level dehumidification, and then Leave the evaporator and enter the dehumidifier 7;

Step4: After the primary dehumidification in the dehumidifier, the circulating air is further dehumidified, and the water vapor in it is removed to form a cold and dry air with extremely low humidity, which is the circulating air after the secondary dehumidification, and then enters the gas plate heat exchange described in Step2 The device 6 performs heat exchange with the hot and humid circulating airflow leaving the drying chamber 4, so as to realize the preheating of the circulating airflow after the secondary dehumidification;

Step5: The circulating air after the secondary dehumidification is preheated by Step4, and then enters the internal condenser 8 of the heat pump unit for further heating to form the required low temperature (about 30~50°C) and low humidity (relative humidity 0~5%) cycle The air flow finally returns to the drying chamber 4 after being regulated by the air duct regulating valve 3. Here, the air duct regulating valve is used to adjust the flow of low-temperature and low-humidity circulating air entering the drying chamber according to the value of the pressure vacuum gauge. The air duct regulating valve makes drying The micro-negative pressure value that is most suitable for the material to be dried is formed in the room, and then returns to Step 1, and the reciprocating cycle realizes the micro-negative pressure and low-temperature drying of the material.

Example 3:

Furthermore, the micro-negative pressure low-temperature drying device and its drying process are used to efficiently dry high-value-added materials that are extremely sensitive to drying temperature and cannot destroy their active ingredients.

The preferred scheme adopts a micro-negative pressure low-temperature drying device and its drying process for efficient drying of Chinese herbal medicines, health care products, seeds, high-grade agricultural products and seafood products.

Example 4:

The drying process of a micro-negative pressure low-temperature drying device is as follows:

As shown in Figure 1, firstly, the special heat-sensitive materials to be dried at low temperature are evenly dispersed and arranged on the layered drying tray 10 inside the drying chamber 4 where the materials to be dried are placed. After the material to be dried is arranged outside the drying chamber, it is installed back on the drying trays of each layer in the drying chamber. Finally, the sealed outer door of the drying chamber is closed to isolate the interior of the drying chamber from the outside world, which is convenient for the drying process to form a micro Negative pressure;

Next, start the drying operation, start the circulating fan 5, so that the circulating airflow can flow stably, and the circulation flow path of the drying circulating airflow leaving the drying chamber is: drying chamber 10 → circulating fan 5 → gas plate heat exchanger 6 → inside the heat pump unit Evaporator 8 → dehumidifier 7 → gas plate heat exchanger 6 → internal condenser 2 of the heat pump unit → air duct regulating valve 3 → drying chamber 10;

After the circulation fan starts and runs stably, start the dehumidifier 7 and the internal compressor 1 of the heat pump unit, and then adjust the air duct regulating valve 3 according to the displayed value of the pressure vacuum gauge 11 to form a stable and suitable micro negative pressure for the material to be dried inside the drying chamber. Pressure value, and continue to dry until the material to be dried meets the drying requirements, and finally shut down the system operation; in order to ensure the safety and stability of the system, when shutting down, first stop the internal compressor 1 of the heat pump unit and delay for 30s before turning off the dehumidifier 7 and the circulation Fan 5.

Example 5:

The detailed process when the drying circulating air circulates in the system and removes the moisture contained in the material to be dried is as follows:

(1) Low-temperature (30-50°C) low-humidity (0-5%) circulating airflow enters the drying chamber 10 to quickly absorb moisture and dry the materials to be dried evenly arranged on the drying trays 10 of each layer;

(2) The circulating air flow absorbs moisture and dries the material and becomes a hot and humid circulating air flow, which leaves the drying chamber 10 under the suction of the circulating fan 5 and enters the gas plate heat exchanger 6 to be dehumidified after the second stage. The circulating air is subjected to heat exchange to realize the pre-cooling of the hot and humid circulating air leaving the drying chamber 10;

(3) The circulating air flow after pre-cooling leaves the gas plate heat exchanger 6 and enters the evaporator 8 inside the heat pump unit. The heat released in the evaporator 8 greatly reduces the temperature and condenses and precipitates the moisture in the air flow, which is the circulating air flow after the first-level dehumidification (temperature 0~10°C, relative humidity 100%), then leave the evaporator 8 and enter the dehumidifier 7;

(4) After the first-stage dehumidification in the dehumidifier 7, the circulating airflow is further dehumidified to remove the water vapor in it to form a low-temperature dry airflow with extremely low humidity, which is the circulating airflow after the second-stage dehumidification (temperature 0~10℃, relative humidity 0 ~10%), and then enter the gas plate heat exchanger 6 described in step (2) to perform heat exchange with the hot and humid circulating airflow leaving the drying chamber 10, so as to realize the preheating of the circulating airflow after the secondary dehumidification;

(5) The circulating airflow after the secondary dehumidification is preheated in step (4), and then enters the internal condenser 2 of the heat pump unit for further heating to form the required low-temperature and low-humidity circulating airflow (temperature 30~50°C, relative humidity 0 ~5%), and finally return to the drying chamber 10 after being regulated by the air duct regulating valve 2, where the air duct regulating valve 3 before entering the drying chamber 10 is adjusted according to the value of the pressure vacuum gauge 11 to make the drying chamber 10 form The most suitable micro-negative pressure value for the material to be dried, and then return to step (1), so that the reciprocating cycle realizes the micro-negative pressure and low-temperature drying of the material.

Apparently, the above-mentioned specific implementation is only an example for clearly illustrating the utility model, but not a limitation to the utility model implementation. For those skilled in the art, they can easily make Other changes or substitutions in form will also be included in the scope of protection determined by the present utility model.

Claims (7)

1. A kind of 1. tiny structure low temperature drying device, it is characterised in that：It includes hothouse（4）, the hothouse（4）Inside is set There is basin（10）, the hothouse（4）Bottom be communicated with source pump internal condensation device（2）, inside the source pump Condenser（2）Simultaneously with source pump inner compressor（1）, source pump inner evaporator（8）With gas plate type heat exchanger（6） It is connected；The hothouse（4）Top pass through circulating fan（5）With gas plate type heat exchanger（6）It is connected；In the source pump Portion's evaporator（8）With gas plate type heat exchanger（6）Between be also equipped with dehumidifier（7）；The source pump internal condensation device（2） And hothouse（4）Between pipeline on airduct regulating valve is installed（3）And pressure vacuum meter（11）；It is cold inside the source pump Condenser（2）With source pump inner evaporator（8）Between pipeline on source pump internal restriction expansion valve is installed（9）.
2. A kind of 2. tiny structure low temperature drying device according to claim 1, it is characterised in that：The pressure vacuum meter（11） Hothouse can be detected（4）Internal negative pressure numerical value.
3. A kind of 3. tiny structure low temperature drying device according to claim 1, it is characterised in that：The source pump can use Common electric drive heat pump unit, it can also use the lithium bromide absorption type heat pump unit of Driven by Solar Energy.
4. A kind of 4. tiny structure low temperature drying device according to claim 1, it is characterised in that：The dehumidifier（7）It can adopt With rotary dehumidifier or solution dehumidifier.
5. A kind of 5. tiny structure low temperature drying device according to claim 1, it is characterised in that：The airduct regulating valve（3） Adjustable hothouse（4）Interior pressure makes it operationally be in tiny structure.
6. A kind of 6. tiny structure low temperature drying device according to claim 1, it is characterised in that：The regeneration of the dehumidifier can Using a variety of clean and effective energy, such as solar energy, geothermal energy, industrial exhaust heat.
7. A kind of 7. tiny structure low temperature drying device according to claim 1, it is characterised in that：The gas plate type heat exchanger （6）The circulating current after two level dehumidifies can be preheated, and simultaneously to the hothouse（4）The hot wet circulating air of discharge flows into Row precooling.