CN113261587B - Air drying processing method and device for fresh mature figs - Google Patents
Air drying processing method and device for fresh mature figs Download PDFInfo
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- CN113261587B CN113261587B CN202010097007.5A CN202010097007A CN113261587B CN 113261587 B CN113261587 B CN 113261587B CN 202010097007 A CN202010097007 A CN 202010097007A CN 113261587 B CN113261587 B CN 113261587B
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- A23B7/00—Preservation or chemical ripening of fruit or vegetables
- A23B7/02—Dehydrating; Subsequent reconstitution
- A23B7/0205—Dehydrating; Subsequent reconstitution by contact of the material with fluids, e.g. drying gas or extracting liquids
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L5/00—Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
- A23L5/57—Chemical peeling or cleaning of harvested fruits, vegetables or other foodstuffs
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- A—HUMAN NECESSITIES
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- A23N12/00—Machines for cleaning, blanching, drying or roasting fruits or vegetables, e.g. coffee, cocoa, nuts
- A23N12/08—Machines for cleaning, blanching, drying or roasting fruits or vegetables, e.g. coffee, cocoa, nuts for drying or roasting
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- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
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Abstract
The invention relates to the technical field of fig processing, in particular to an air drying processing method and a device for fresh ripe fig fruits, which can fully ensure the processing quality of the ripe fruits, have low processing cost and good product flavor and are easy for large-scale industrial production.
Description
The technical field is as follows:
the invention relates to the technical field of fig processing, in particular to an air drying processing method and device for fresh ripe figs, which can fully ensure the processing quality of ripe fruits, have low processing cost and good product flavor and are easy for large-scale industrial production.
Background
The fig is a seasonal fruit with rich nutrition and fresh and sweet taste, but the fresh fruit is not easy to store. When the temperature exceeds 28 ℃, the shelf life is only one day. The ripe fruits are picked in the same day and sold and eaten in the same day. Generally, fresh fig can be eaten only in the original producing area and areas near the original producing area, the fresh fig is far in the way, and the fresh fig is well-covered, high in price and not good in quality.
The fig planting has obvious geographical characteristics, concentrated production areas and large acre yield. Fresh fruit is not locally digestible. The fruiting period is long, and picking is carried out every day in the mature period. Local growers strive for selling good prices to meet sales requirements, generally pick fruits at night, have poor labor conditions and reverse day and night time. The growers love and hate the figs. If the farmers who are old and weak are not suitable for the picking mode, the farmers often suffer from pain and abandon the fig fields which are already high in yield.
A large amount of figs are processed into dried figs, so that firstly, fresh fruits produced in a centralized manner are digested, secondly, the sale period of the figs is prolonged, and the sale mode of the figs is changed.
There are four mainstream processing methods for dried fig in the market: firstly, drying the whole original fruit, secondly, freeze-drying, thirdly, drying (sun-drying) after cooking (steaming), and fourthly, cutting into strips at medium-high temperature and drying.
However, the processing methods all have defects of different degrees, so that the mouthfeel and the original flavor of the fig are greatly changed as follows: the original fruits are dried, only six to seven mature fresh fruits can be adopted, and after drying, the sweetness is not high, and the fruits are dry and hard; the freeze-dried fig is crisp, has only sweet taste, is much greasy, has high processing cost and high price, and is not easy to produce and popularize on a large scale; cooking (steaming), and oven drying or sun drying; after the fig is cooked (boiled) at high temperature, active substances in the fresh fruit are lost completely, the fresh, sweet and delicious feeling of the fresh fruit is completely destroyed, the dried fruit obtained by subsequent processing has poor taste, so that local people are too many to have, and the processing method is adopted for the unsalable cooked fruit; the processing method can only process raw fruits (the maturity of the adopted fresh fruits is higher than that of the original fruits used for drying the raw fruits) and needs to process dried fruits to obtain certain sweetness, so that the dried fruits have harder mouthfeel.
The processing of the mature fresh fig fruit has three difficulties: firstly, the ripe fresh fruit is bad (over-ripe, mellow) in one day, and the process is shorter as the temperature (or humidity) of the environment rises; secondly, the fresh fruits have waxy and white pulp (exudation at the fruit stalks), the ripe fruits are soft and cannot be kneaded vigorously, and the fruits cannot be cleaned cleanly by clear water at normal temperature, which is why the figs have no pesticide residue, but the fresh fruits are peeled and eaten; thirdly, the navel part of the mature fresh fruit is provided with holes, water is easy to enter the inside of the fruit, and if water enters the inside of the fruit, the fresh fruit turns to be tasty within one hour.
How to ensure that the ripe fruits do not deteriorate in the processing process, retain the nutrition and the flavor of the fresh fruits to the maximum extent, and be easy for large-scale industrial production is a problem to be solved urgently.
The invention content is as follows:
aiming at the defects and shortcomings in the prior art, the invention provides an air drying processing method and a matching device thereof, which can process the mature fresh fig into dried fig at normal temperature and can preserve the nutrition and flavor of the fresh fig to the maximum extent. The matching device has low energy consumption, simple facilities and easy large-scale production, and can adopt factory and workshop production.
The invention is achieved by the following measures:
a method for air-drying and processing fresh mature figs, which is characterized by comprising the following steps:
step 1: selecting mature fresh fruits, and putting the selected fresh fruits into a high-temperature alkali solution to remove the waxiness on the surface of the fresh fruits;
step 2: cleaning the fig treated in the step 1 by using normal-temperature clear water, and cleaning the floating skin peeled off from the surface of the fig;
and step 3: treating air by freezing dehumidification method to obtain dry air with relative humidity of 10-20% RH at normal temperature (25-38 deg.C);
and 4, step 4: cutting the fig processed in the step 2, placing the cut fig on a screen, sending the fig into an air duct in an air drying chamber, introducing the air prepared in the step 3, and carrying out air drying treatment for 20-25 hours;
and 5: obtaining dried fig with water content of 15-20%, sealing and packaging 250g and 500g of dried fig according to requirements, and storing or selling.
In the step 1 of the invention, 0.5% sodium hydroxide solution is adopted as the alkali solution, the alkali solution is heated to boiling, the mature fresh fig is put into the solution and kept for 15-30 s, the high-temperature alkali solution removes the waxiness on the surface of the fig and the attachments on the surface, the cleaning effect is indirectly achieved, and the subsequent air drying and dehydration effect is enhanced after the waxiness on the surface of the peel of the fresh fig is removed.
In step 2 of the invention, fresh fig fruits fished out from 0.5% sodium hydroxide solution are immediately placed in a water tank containing a large amount of clear water, and are gently rubbed and rolled to wash off the surface floating skin of the fresh fig fruits.
In the step 4 of the invention, an air duct is arranged in the air drying chamber, the air duct is filled with the dry normal temperature air (the temperature is 25-38 ℃, the relative humidity is 10-20% RH) prepared in the step 3, the air flow rate is controlled to be 1-2m/s, the fig in the step 2 is cut and spread in a screen mesh, and the screen mesh is placed in the air duct for normal temperature air drying.
The invention also provides a device for realizing the air drying processing method of the fresh ripe figs, which is provided with an air drying chamber, wherein the air drying chamber is provided with an air duct for air drying the figs.
The first evaporator, the second condenser and the first condenser in the normal-temperature low-humidity air preparation mechanism are sequentially arranged in the dehumidification air duct, the first compressor adopts a high-back-pressure compressor, and the second compressor adopts a medium-back-pressure compressor.
The normal-temperature low-humidity air preparation mechanism is provided with an air inlet and an air outlet which are oppositely arranged, two freezing chambers are arranged between the air inlet and the air outlet in parallel, cooling assemblies are arranged in the freezing chambers, evaporators in two dehumidification loops are positioned on one sides of the air inlets of the two freezing chambers, condensers in the two dehumidification loops are positioned on the lower sides of the air outlets of the two freezing chambers, namely, a first evaporator in a first dehumidification loop is positioned on one side of the air inlet in the first freezing chamber, and a first condenser is positioned on the lower side of the air outlet of the second freezing chamber; and a second evaporator in the second dehumidification loop is positioned on one side of the air inlet in the second freezing chamber, and a second condenser in the second dehumidification loop is positioned on the lower side of the air outlet in the first freezing chamber.
The invention can further adopt two evaporators, a middle backpressure compressor and a condenser to finish the preparation of the normal temperature low humidity air, under the condition, the normal temperature low humidity air preparation mechanism is provided with two freezing chambers between an air inlet and an air outlet in parallel, a cooling component is arranged in each freezing chamber, the first evaporator and the second evaporator are respectively positioned at one side of the air inlet in the two freezing chambers, the condenser is positioned at one side of the air outlet of the normal temperature low humidity air preparation mechanism, the condenser is connected with the two evaporators through a three-way valve, and the three-way valve is used for controlling the flow direction of the refrigerant in a circulation pipeline, namely controlling the refrigerant to flow from the first evaporator to the condenser or from the second evaporator to the condenser, thereby finishing the work of the whole normal temperature low humidity air preparation mechanism.
The cooling assembly is used for cooling and dehumidifying air, and the air temperature control range is-4 ℃ when cooling and dehumidifying.
According to the invention, the fresh mature fig is peeled, cleaned, placed on an indoor closed airing facility, and air with normal temperature and low humidity is introduced for airing, so that the fig is quickly dehydrated to prepare dried fig.
Description of the drawings:
FIG. 1 is a schematic structural view of a normal-temperature low-humidity air preparation mechanism in embodiment 1 of the present invention.
FIG. 2 is a schematic structural view of a normal-temperature low-humidity air preparation mechanism in embodiment 2 of the present invention.
Fig. 3 is a schematic structural view of a room-temperature low-humidity air preparation mechanism in embodiment 3 of the present invention.
Reference numerals: the system comprises a high-back-pressure compressor 1, a medium-back-pressure compressor 2, a first evaporator 3, a second evaporator 4, a second condenser 5, a first condenser 6, a first freezing chamber 7, a second freezing chamber 8, a first compressor 9, a second compressor 10, a three-way valve 11, a condenser 12 and a compressor 13.
The specific implementation mode is as follows:
the invention will be further described with reference to the accompanying drawings.
Example 1:
the fresh mature fig fruit processing method provided by the invention is completed by utilizing a normal-temperature low-humidity air preparation mechanism as shown in the attached figure 1, wherein the following steps are firstly executed:
step 1: selecting ripe fresh fig, peeling by using alkali liquor, heating the alkali liquor to boiling by using 0.5% sodium hydroxide solution as the alkali liquor, putting ripe fresh fig fruits into the alkali liquor and keeping the ripe fresh fig fruits for 15-30 s, removing wax on the surface of the fig and attachments on the surface by using a high-temperature alkali solution to indirectly play a role in cleaning, and enhancing the subsequent air drying and dewatering effect after removing the wax on the surface of peel of the fresh fig fruits;
step 2: washing the fig treated in the step 1 by using normal-temperature clear water, and washing off floating skins shed from the surface of the fig;
and step 3: treating air by freezing dehumidification method to obtain dry air with relative humidity of 10-20% RH at normal temperature (25-38 deg.C);
and 4, step 4: cutting and spreading the fig cleaned in the step 2 on a screen, placing the screen in an air duct in an air drying room, introducing the normal-temperature low-humidity air prepared by the air preparation mechanism into the air duct (the air flow rate in the air duct is controlled to be between 1 and 2 m/s), and continuously introducing for 20 to 25 hours;
and 5: obtaining dried fig with water content of 15-20%, sealing and packaging 250g and 500g of dried fig according to requirements, and storing or selling.
Wherein, in the step 3, the normal temperature low humidity air preparation mechanism shown in the attached figure 1 is used for processing the air to obtain the dry air with the relative humidity of 10-20% RH at normal temperature (25-38 ℃), and the air outlet of the normal temperature low humidity air preparation mechanism is connected with the air inlet of the air drying chamber;
in the embodiment, secondary dehumidification is adopted, namely, air continuously passes through two evaporators for cooling and dehumidification, and then continuously passes through two condensers; as shown in fig. 1, the high back pressure compressor 1, the first evaporator 3 and the first condenser 6 form a loop; the middle back pressure compressor 2, the second evaporator 4 and the second condenser 5 form another loop, air enters from an air inlet, and is cooled to 6-10 ℃ through the first evaporator, most of moisture in the air is removed, and the first evaporator is ensured not to frost; then passing through a second evaporator to obtain air at about-4 ℃, and then sequentially passing through two condensers to be heated to normal temperature, thereby obtaining a normal temperature drying air flow with 10-20% RH; the middle back pressure compressor 2 works intermittently and controls the second evaporator to switch between frosting and defrosting (when the compressor works, the evaporator frosts, and when the compressor does not work, the evaporator defrosts).
At present, most of the dehumidifiers sold in the market are primary dehumidifiers; namely, air is sent into an evaporator, the temperature is reduced to precipitate condensed water, the absolute humidity of the air is reduced, and the air with the precipitated condensed water is heated to the initial temperature (slightly raised) through a condenser; since water freezes below 0 ℃, the dehumidifier cannot adopt a limit design mode (i.e., the air temperature is 0 ℃ after the air passes through the evaporator) in order to have wide temperature adaptability, so that the freezing dehumidifier has a limit value of 20% RH or more; the embodiment realizes the acquisition of normal-temperature low-humidity air by using the two-stage dehumidification mechanism, has reasonable structure and low cost, and is particularly suitable for large-scale processing and production.
Example 2:
the normal-temperature low-humidity air preparation mechanism shown in the attached figure 2 is used for completing the processing method of the fresh ripe figs provided by the invention, and the steps except for the preparation of the normal-temperature low-humidity air are the same as those in the embodiment 1.
As shown in fig. 2, in this embodiment, two freezing chambers (a first freezing chamber 7 and a second freezing chamber 8), a first air duct provided in the first freezing chamber 7, and a second air duct provided in the second freezing chamber 8 are arranged in parallel between an air inlet and an air outlet of the normal-temperature low-humidity air preparation mechanism; the normal-temperature low-humidity air preparation mechanism is provided with two groups of dehumidification loops, wherein a first evaporator 3, a first compressor 9 and a first condenser 6 which are connected in sequence are arranged in the first dehumidification loop, and a second evaporator 4, a second compressor 10 and a second condenser 5 which are connected in sequence are arranged in the second dehumidification loop; in this example, the evaporator is arranged in the freezing chamber and close to the air inlet, the condenser is arranged outside the freezing chamber and below the air outlet of the freezing chamber; the adopted compressor is a medium back pressure compressor;
namely, the first evaporator 3 in the first dehumidification loop is positioned at one side of an air inlet of the first freezing chamber 7, and the first condenser 6 is positioned at one side of an air outlet of the second freezing chamber 8; the second evaporator 4 in the second dehumidification loop is positioned at one side of the air inlet of the second freezing chamber 8, and the second condenser 5 in the second dehumidification loop is positioned at one side of the air outlet of the first freezing chamber 7.
The following takes a cycle in normal operation as an example to describe the specific implementation process of the present example:
an initial state: the temperature of the first freezing compartment 7 is lowered to-4 c and the temperature of the second freezing compartment 8 is raised to 4 c. (to increase thermal inertia, both chambers are charged with some medium having a high specific heat value in order not to shut down and start up the compressor too frequently.)
Closing the air inlet and outlet of the second freezing chamber 8, closing the first compressor 9, opening the air inlet and outlet of the first freezing chamber 7, starting the second compressor 10, and enabling the normal-temperature air to flow through the first freezing chamber 7 and generate heat exchange with media in the first freezing chamber to form low-temperature saturated humidity air (-4 ℃); the air discharged from the first freezing chamber 7 is heated by the second condenser 5 and then discharged through the air outlet (the air temperature at the air outlet is slightly higher than that at the air inlet, and the air humidity is 10-20% RH);
in the process that the temperature of the first freezing chamber 7 is increased from-4 ℃ to 4 ℃, the first evaporator 3 finishes defrosting operation; refrigerating the second evaporator 4 of the second freezing chamber 8, reducing the temperature of the second freezing chamber 8 from 4 ℃ to-4 ℃, and gradually frosting the second evaporator 4;
when the temperature of the first freezing chamber 7 reaches 4 ℃, closing an air inlet and an air outlet of the first freezing chamber 7, closing the second compressor 10, opening an air inlet and an air outlet of the second freezing chamber 8, and starting the first compressor 9; at this time, the normal temperature air flows through the second freezing chamber 8 and exchanges heat with the medium in the second freezing chamber to form low temperature saturated humidity air (-4 ℃); the air discharged from the second freezing chamber 8 is heated by the first condenser 6 and then discharged through the air outlet (the air temperature at the air outlet is slightly higher than the air inlet temperature, the air humidity is 10-20% RH);
in the process that the temperature of the second freezing chamber 8 is increased from-4 ℃ to 4 ℃, the second evaporator 4 finishes defrosting operation; refrigerating the first evaporator 3 of the first freezing chamber 7, reducing the temperature of the first freezing chamber 7 from 4 ℃ to-4 ℃, and gradually frosting the first evaporator 3;
similarly as described hereinafter; the above steps are repeated.
Example 3:
the normal-temperature low-humidity air preparation mechanism shown in the attached figure 3 is used for completing the processing method of the fresh ripe figs provided by the invention, wherein the steps except for the preparation of the normal-temperature low-humidity air are the same as those in the embodiment 1.
Wherein, in the step 3, the normal-temperature low-humidity air preparation mechanism shown in the attached figure 3 is used for processing air to obtain dry air with the relative humidity of 10-20% RH at normal temperature (25-38 ℃), and an air outlet of the normal-temperature low-humidity air preparation mechanism is connected with an air inlet of the air drying chamber;
in the embodiment, the preparation of the normal temperature low humidity air is completed by adopting two evaporators, a middle backpressure compressor 13 and a condenser 12, in this case, the normal temperature low humidity air preparation mechanism is provided with two freezing chambers in parallel between an air inlet and an air outlet, a cooling component is arranged in each freezing chamber, a first evaporator 3 and a second evaporator 4 are respectively positioned at one side of the air inlet in each freezing chamber, the condenser 12 is positioned at one side of the air outlet of the normal temperature low humidity air preparation mechanism, the condenser 12 is connected with the two evaporators through a three-way valve 11, the three-way valve 11 is used for controlling the flow direction of refrigerant in a circulating pipeline, namely controlling the refrigerant to flow from the first evaporator to the condenser or from the second evaporator to the condenser, and completing the work of the whole normal temperature low humidity air preparation mechanism.
Only one cycle of operation during normal operation will be described.
Initial state: the temperature of the first freezing chamber 7 is reduced to-4 ℃, and the temperature of the second freezing chamber 8 is increased to 4 ℃; (in order not to reverse the three-way valve 11 too frequently, both freezing chambers are filled with some medium with a high specific heat value to increase thermal inertia).
a. The air inlet and outlet of the second freezing chamber 8 are closed, the air inlet and outlet of the first freezing chamber 7 are opened, and the three-way valve 11 is communicated with the second evaporator 4. At this time, the normal temperature air flows through the first freezing chamber 7 and exchanges heat with the medium therein to form low temperature saturated humidity air (-4 ℃). The air discharged from the first freezing chamber 7 is heated by the condenser 12 and then discharged through the air outlet (the air temperature at the air outlet is slightly higher than the air inlet temperature, and the air humidity is 10-20% RH). In the process that the temperature of the first freezing chamber 7 is increased from-4 ℃ to 4 ℃, the first evaporator 3 finishes defrosting operation; the second evaporator 4 of the second freezing chamber 8 performs refrigeration, the temperature of the second freezing chamber 8 is reduced from 4 ℃ to-4 ℃, and the second evaporator 4 gradually frosts.
b. When the temperature of the first freezing chamber 7 reaches 4 ℃, the air inlet and the air outlet of the first freezing chamber 7 are closed, the air inlet and the air outlet of the second freezing chamber 8 are opened, and the three-way valve 11 is communicated with the first evaporator 3. At this time, the normal temperature air flows through the second freezing chamber 8 and exchanges heat with the medium therein to form low temperature saturated humidity air (-4 ℃). The air discharged from the second freezing chamber 8 is heated by the condenser 12 and discharged through the air outlet (the air temperature at the air outlet is slightly higher than the air inlet temperature, the air humidity is 10-20% RH). In the process that the temperature of the second freezing chamber 8 is increased from-4 ℃ to 4 ℃, the second evaporator 4 finishes defrosting operation; the first evaporator 3 of the first freezing chamber 7 performs refrigeration, the temperature of the first freezing chamber 7 is reduced from 4 ℃ to-4 ℃, and the first evaporator 3 gradually frosts.
And thereafter as described in paragraphs a, b above; the above steps are repeated.
The fresh picked fig is peeled, cleaned, air-dried and packaged in grades to obtain the finished product, and the method provided by the invention can be used for processing the mature fresh fig into dried fig at normal temperature.
Claims (8)
1. A method for air-drying and processing fresh mature figs, which is characterized by comprising the following steps:
step 1: selecting mature fresh fruits, and putting the selected fresh fruits into a high-temperature alkali solution to remove the waxiness on the surface of the fresh fruits;
step 2: washing the fig treated in the step 1 by using normal-temperature clear water, and washing off floating skins shed from the surface of the fig;
and step 3: treating air by a freezing dehumidification method to obtain dry air with a relative humidity of 10-20% RH at a normal temperature of 25-38 deg.C, wherein the dry air with the relative humidity of 10-20% RH at the normal temperature of 25-38 deg.C is obtained by: adopting secondary dehumidification to ensure that the air continuously passes through the two evaporators for cooling and dehumidification, and then continuously passes through the two condensers; the high-back-pressure compressor, the first evaporator and the first condenser form a loop; the middle back pressure compressor, the second evaporator and the second condenser form another loop, air enters from the air inlet, and is cooled to 6-10 ℃ through the first evaporator, most of moisture in the air is removed, and the first evaporator is guaranteed not to frost; then passing through a second evaporator to obtain air at-4~4 ℃, and then sequentially passing through two condensers to be heated to normal temperature, thereby obtaining a normal-temperature dry air flow with 10-20% RH; the middle back pressure compressor works intermittently and controls the second evaporator to switch between frosting and defrosting;
and 4, step 4: cutting the fig processed in the step 2, placing the cut fig on a screen, sending the fig into an air duct of an air drying chamber, introducing the air prepared in the step 3, controlling the air flow rate to be 1-2m/s, and carrying out air drying treatment for 20-25 hours;
and 5: obtaining dried fig with water content of 15-20%.
2. The air drying processing method of the fresh ripe figs according to claim 1, wherein in the step 1, 0.5% sodium hydroxide solution is adopted as the alkali solution, the alkali solution is heated to boiling, the fresh ripe figs are put into the alkali solution and kept for 15-30s, the high-temperature alkali solution removes the waxiness on the surface of the figs and the attachments on the surface, the cleaning effect is indirectly achieved, and after the waxiness on the surface of the peel of the fresh figs is removed, the subsequent air drying dehydration effect is enhanced.
3. The fresh fig air-drying processing method as claimed in claim 1, wherein in step 2, the fresh ripe fig obtained by taking out from 0.5% sodium hydroxide solution is immediately placed in a water tank containing a large amount of clear water, and the fresh fig is gently rubbed and rolled to wash off the surface peels of the fresh fig.
4. An air drying processing device for fresh ripe figs, which is used for realizing the air drying processing method for fresh ripe figs according to any one of claims 1-3 and is provided with an air drying chamber, wherein the air drying chamber is provided with an air duct for air drying figs, and is characterized by further being provided with a normal-temperature low-humidity air preparation mechanism, an air inlet of the air drying chamber is connected with an air outlet of the normal-temperature low-humidity air preparation mechanism, the normal-temperature low-humidity air preparation mechanism is provided with a secondary dehumidifying component, the secondary dehumidifying component comprises two dehumidifying loops respectively consisting of an evaporator, a condenser and a compressor, wherein the first dehumidifying component is formed by sequentially connecting a first evaporator, a first compressor and a first condenser, and the second dehumidifying component is formed by sequentially connecting a second evaporator, a second compressor and a second condenser.
5. An air drying and processing device for fresh ripe figs according to claim 4, wherein in said air preparation mechanism with normal temperature and low humidity, air passes through a first evaporator, a second condenser and a first condenser in sequence, the first compressor adopts a high back pressure compressor, and the second compressor adopts a medium back pressure compressor.
6. An air drying and processing device for fresh ripe figs according to claim 4, wherein the normal temperature and low humidity air preparation mechanism is provided with an air inlet and an air outlet, two freezing chambers are arranged between the air inlet and the air outlet in parallel, a cooling component is arranged in each freezing chamber, evaporators in the two dehumidification loops are positioned on one side of the air inlet in each freezing chamber, condensers in the two dehumidification loops are positioned on the lower side of the air outlet in each freezing chamber, namely, a first evaporator in the first dehumidification loop is positioned on one side of the air inlet in the first freezing chamber, and a first condenser is positioned on the lower side of the air outlet in the second freezing chamber; a second evaporator in the second dehumidification loop is located on one side of an air inlet in the second freezing chamber, a second condenser in the second dehumidification loop is located on the lower side of an air outlet in the first freezing chamber, and the compressors are middle-pressure compressors.
7. An air drying and processing device for fresh ripe figs according to claim 4, wherein two evaporators, a medium-back pressure compressor and a condenser are used for preparing air with low humidity and normal temperature, in this case, the air preparation machine with low humidity and normal temperature is provided with two freezing chambers in parallel between the air inlet and the air outlet, a cooling component is arranged in each freezing chamber, the first evaporator and the second evaporator are respectively positioned on one side of the two freezing chambers close to the air inlet, the condenser is positioned on one side of the air outlet of the air preparation mechanism with low humidity and normal temperature, the condenser is connected with the two evaporators through a three-way valve, and the three-way valve is used for controlling the flow direction of refrigerant in a circulating pipeline, namely controlling the refrigerant to flow from the first evaporator to the condenser or from the second evaporator to the condenser, so as to complete the work of the whole air preparation mechanism with low humidity and normal temperature.
8. An air drying and processing device for fresh ripe figs according to claim 6, wherein said cooling component is used for cooling and dehumidifying air, and the temperature control range of the air during cooling and dehumidifying is-4~4 ℃.
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| CN101375695A (en) * | 2007-08-31 | 2009-03-04 | 威海紫光科技园有限公司 | Method for producing dried fruit of Ficus carica |
| CN103719762A (en) * | 2013-12-26 | 2014-04-16 | 陶峰 | Method for processing fig products |
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| JPH02133759A (en) * | 1988-11-15 | 1990-05-22 | Toshiba Corp | Air conditioner |
| JP2001090990A (en) * | 1999-09-20 | 2001-04-03 | Chikayoshi Sato | Dehumidifier |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101375695A (en) * | 2007-08-31 | 2009-03-04 | 威海紫光科技园有限公司 | Method for producing dried fruit of Ficus carica |
| CN103719762A (en) * | 2013-12-26 | 2014-04-16 | 陶峰 | Method for processing fig products |
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