CN105794953B - Differential pressure precooling system and method - Google Patents
Differential pressure precooling system and method Download PDFInfo
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- CN105794953B CN105794953B CN201410843456.4A CN201410843456A CN105794953B CN 105794953 B CN105794953 B CN 105794953B CN 201410843456 A CN201410843456 A CN 201410843456A CN 105794953 B CN105794953 B CN 105794953B
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Abstract
The invention relates to the technical field of agricultural product storage, in particular to a differential pressure precooling system and method with ice as a cold source. The differential pressure precooling system comprises a negative pressure forming area, a cooling area and a cold source storage area; the negative pressure forming region includes: a fan and a plenum box; the fan extracts air in the static pressure box connected with the fan to form pressure difference, so that the cold source storage area cools the fruits and vegetables in the cooling area; one end of the cooling area is connected with the negative pressure forming area, and the other end of the cooling area is connected with the cold source storage area; and the negative pressure forming area, the cooling area and the cold source storage area form a nearly closed space. The differential pressure precooling system and the differential pressure precooling method provided by the invention can quickly cool fruits and vegetables, and simultaneously replenish water lost by agricultural products of fruits and vegetables in the cooling process, thereby improving the fresh-keeping rate of the agricultural products of fruits and vegetables.
Description
Technical Field
The invention relates to the technical field of agricultural product storage, in particular to a differential pressure precooling system and method with ice as a cold source.
background
The fruits and vegetables are extremely easy to rot and deteriorate and difficult to store due to the high respiration rate and evaporation rate. After the agricultural products are harvested, a large amount of field heat and respiratory heat can be accumulated, the physiological phenomena are quickened, and then the aging and deterioration of the products are accelerated. The pre-cooling is a technique for rapidly cooling the product in a short time, and the required low temperature must be achieved within several minutes to one day, and actually comprises a plurality of rapid cooling techniques without damaging the product. The pre-cooling operation is mostly independent of the operation other than the refrigeration, and the currently actually adopted pre-cooling methods can be divided into the following methods: ice water precooling, vacuum precooling, differential pressure precooling, crushed ice precooling and the like.
Differential pressure precooling is a forced ventilation cooling method, and the cooling mode is to force cold air to enter a packing box so that the cold air is directly contacted with a product. The principle is that the pressure difference is formed between two sides of the packing box by using the exhaust fan, cold air enters from a vent hole at one side of the packing box and is treated by a vent hole at the other side after contacting with a product, and meanwhile, heat in the box is taken away. However, the conventional differential pressure precooling device has a slow cooling speed, and is easy to cause water loss of a product, and a humidification system is often additionally arranged to keep a certain relative humidity in the use process.
Disclosure of Invention
the invention aims to provide a differential pressure precooling system and a differential pressure precooling method capable of supplementing water lost by a product in a cooling process.
In order to solve the technical problem, the invention provides a differential pressure precooling system. The differential pressure precooling system comprises:
A negative pressure forming region, a cooling region and a cold source storage region;
The negative pressure forming region includes: a fan and a plenum box; the fan extracts air in the static pressure box connected with the fan to form pressure difference, so that the cold source storage area cools the fruits and vegetables in the cooling area;
One end of the cooling area is connected with the negative pressure forming area, and the other end of the cooling area is connected with the cold source storage area; and the negative pressure forming area, the cooling area and the cold source storage area form a nearly closed space.
preferably, the cold source storage region includes: the cold source discharging device comprises a side plate, a cold source discharging device and a cover plate;
The side plate and the cover plate enclose a cold source storage area, and the cold source discharge device is connected with the side plate and communicated with the cold source storage area;
The cold source storage area is internally provided with a plurality of layers of clapboards, and a plurality of ice balls are placed on the clapboards; the ice balls provide cold sources for the differential pressure precooling system;
And the cold source discharge device is provided with a through hole and is connected with the cooling area.
preferably, the cover plate is a detachable cover plate, so that the partition plate can be conveniently taken and placed.
preferably, the section of the partition board is wavy, and each trough of the wavy partition board is used for accommodating ice balls.
Preferably, the diameter of the ice ball is larger than the distance between two adjacent wave crests of the wavy partition plate and smaller than the distance between the upper layer and the lower layer of the wavy partition plate.
preferably, the cold source storage region further comprises a rib formed on the side plate for placing the plurality of partition plates.
Preferably, the through hole is circular, and the diameter is 80-100 mm.
Preferably, the cooling area is one of canvas or plastic cloth.
The invention also provides a differential pressure precooling method, and precooling is carried out by adopting the differential pressure precooling system.
The technical scheme of the invention has the following advantages: the differential pressure precooling system provided by the invention utilizes the ice storage tank provided with the ice balls to replace a refrigerating system. After the fruit and vegetable agricultural products are put into the system, the fan is directly started, so that pressure difference is generated on two sides of a fruit and vegetable basket for containing the fruit and vegetable agricultural products, and the system can be rapidly cooled. Meanwhile, after the fan is started, moisture generated by the evaporation of the ice blocks directly contacts fruit and vegetable agricultural products along with cold air, so that the moisture lost by the fruit and vegetable agricultural products is supplemented in the cooling process, and the fresh-keeping rate of the fruit and vegetable agricultural products is improved.
Drawings
fig. 1 is a schematic structural diagram of a differential pressure precooling system provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of an ice storage tank in a differential pressure precooling system according to an embodiment of the invention;
FIG. 3 is a front view of an ice bank in a differential pressure precooling system provided by an embodiment of the invention;
fig. 4 is a cross-sectional view of an ice bank in a differential pressure precooling system provided by an embodiment of the invention.
In the figure: 1: an ice storage tank; 2: a fruit and vegetable basket; 3: canvas; 4: a static pressure box; 5: a fan; 6: a box body; 7: a cover plate; 8: an air outlet; 9. 10: a side plate; 11: a baffle plate; 12: a wave-shaped clapboard; 13: and a circular through hole.
Detailed Description
The following detailed description of embodiments of the invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1, a schematic structural diagram provided in the embodiment of the present invention.
The differential pressure precooling system comprises a negative pressure forming area, a cooling area and a cold source storage area; the negative pressure forming region includes: a fan 5 and a plenum box 4; the fan 5 extracts air in the static pressure box 4 connected with the fan to form pressure difference, so that the cold source storage area cools the fruits and vegetables in the cooling area; one end of the cooling area is connected with the negative pressure forming area, and the other end of the cooling area is connected with the cold source storage area; and the negative pressure forming area, the cooling area and the cold source storage area form a nearly closed space.
the cold source storage area in the differential pressure precooling system provided by the embodiment of the invention is an ice storage tank with ice balls as an example, but not limited thereto. Generally, the differential pressure precooling system provided by the embodiment of the invention is used for cooling fruits and vegetables in a plurality of fruit and vegetable baskets 2 which are placed under a cooling area in a warehouse, and the advantage of using ice as a cold source is that the cooling speed is high and the water lost by the fruits and vegetables can be supplemented. Furthermore, the fruit and vegetable can be cooled in a cooling area, and the pre-cooling system provided by the embodiment of the invention can achieve a good pre-cooling effect on the object to be pre-cooled, which needs to be pre-cooled and can lose water in the pre-cooling process. The cooling area covers outside a plurality of fruit and vegetable baskets 2, and the fruits and vegetables are cooled in a concentrated mode, so that unnecessary waste is avoided. The cooling area in the embodiment is exemplified by the canvas 3, but the cooling area can be one of canvas or plastic cloth, the canvas 3 is covered on the uppermost layer of the fruit and vegetable baskets 2, and the canvas 3 is directly connected with one end of the ice storage tank, so that the side air leakage can be effectively reduced.
further, as shown in fig. 2, a schematic diagram of an ice storage tank in a differential pressure precooling system according to an embodiment of the present invention is provided. The ice storage tank 1 includes: the cold source discharging device comprises side plates 9 and 10, an air outlet 8 of the cold source discharging device and a cover plate 7, wherein the side plates 9 and 10 and the cover plate 7 enclose the whole ice storage tank 1, and the air outlet 8 is connected with the side plates 9 and 10 and is communicated with the inner area of a tank body 6 of the ice storage tank 1. Wherein, the air outlet 8 with a through hole is positioned at one side of the box body 6 of the ice storage tank 1, the side of the air outlet 8 connected with the canvas 3 is in an outward expansion shape as shown in figure 3, and the air outlet 8 is in an outward expansion shape design for increasing the contact area of the canvas 3 and the cold air in the ice storage tank 1. The partition board is used for accommodating a plurality of ice balls and is arranged in the box body 6 of the ice storage tank 1, wherein the ice balls provide a cold source for the differential pressure precooling system. Further, the cover plate 7 is detachably arranged, the cover plate 7 is opened before precooling operation to place a required partition plate and ice balls, and the cover plate 7 is closed during precooling operation.
Further, a plurality of through-holes that set up on the air exit 8 are circular through-hole 13 for bring into a plurality of fruit and vegetable baskets 2 under the canvas 3 with the air conditioning and the steam of puck evaporation, and the diameter of circular through-hole 13 is 80 ~ 100mm in this embodiment.
further, as shown in fig. 4, fig. 4 is a cross-sectional view of an ice storage tank in a differential pressure precooling system provided by an embodiment of the invention. The partition plate in the ice storage tank 1 of the differential pressure precooling system provided by the embodiment of the invention is a wavy partition plate 12, and the depression of each wave trough of the wavy partition plate 12 is used for accommodating ice balls. The diameter of the ice hockey is larger than the distance between two adjacent wave crests of the wavy partition plate 12 and smaller than the distance between the upper layer and the lower layer of the wavy partition plate 12. The ice hockey prepared by the ice making system in advance is not necessarily a regular ball, and when the ice hockey is irregular, the maximum diameter of the irregular ice hockey is required to be larger than the distance between two adjacent wave crests of the wavy partition plate 12 and smaller than the distance between the upper layer and the lower layer of the wavy partition plate 12. Therefore, gaps are formed on the upper side and the lower side of the ice ball, the flow resistance of air is greatly reduced, the contact area of the air and the ice ball is increased, and the fruit and vegetable precooling speed can be accelerated.
Furthermore, two side wall plates 9 and 10 of the box body 6 of the ice storage tank 1 are respectively provided with a plurality of ribs, namely baffles 11, for placing a plurality of layers of wavy baffles 12, wherein the width of the baffles 11 is 30mm in the embodiment.
the invention also provides a differential pressure precooling method, which adopts a differential pressure precooling system to precool. A plurality of ice balls required by the differential pressure precooling system provided by the embodiment of the invention are generated by adopting an ice making system in advance, and are placed on a plurality of wave-shaped clapboards 12; opening a cover plate 7 of the ice storage tank 1, placing a wavy partition plate 12 with ice balls on baffle plates 11 of two side wall plates 9 and 10 of the ice storage tank 1, and covering the cover plate 7 after the operation is finished; putting a plurality of fruit and vegetable baskets 2 which need to be precooled into a warehouse, and covering canvas 3 on the topmost layer of the fruit and vegetable baskets 2; turning on a power supply of the fan 5 to draw air in the static pressure box 4, and further enabling the pressure in the static pressure box 4 to be lowered, namely forming a low-pressure area at one end of the canvas 3 connected with the static pressure box 4; a high-pressure area is formed in the box body 6 of the opposite ice storage tank 1, air is forced to flow into a fruit and vegetable area after passing through ice balls, rapid heat exchange is carried out to complete precooling operation, and water vapor brought into the ice balls supplies lost water to the fruits and vegetables in the cooling process.
it should be noted that the terms "left", "right", "upper", "lower", and the like used herein are defined with reference to the relative positions of the members shown in the drawings, and it is to be understood that the terms are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In summary, the differential pressure precooling system and the differential pressure precooling method provided by the invention replace the refrigeration system with the ice storage tank provided with the ice balls. After the fruit and vegetable agricultural products are put into the system, the fan is directly started, so that pressure difference is generated on two sides of a fruit and vegetable basket for containing the fruit and vegetable agricultural products, and the system can be rapidly cooled. Meanwhile, after the fan is started, moisture generated by the evaporation of the ice blocks directly contacts fruit and vegetable agricultural products along with cold air, so that the moisture lost by the fruit and vegetable agricultural products is supplemented in the cooling process, and the fresh-keeping rate of the fruit and vegetable agricultural products is improved.
finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A differential pressure precooling system, comprising:
A negative pressure forming region, a cooling region and a cold source storage region;
The negative pressure forming region includes: a fan and a plenum box; the fan extracts air in the static pressure box connected with the fan to form pressure difference, so that the cold source storage area cools the fruits and vegetables in the cooling area;
One end of the cooling area is connected with the negative pressure forming area, and the other end of the cooling area is connected with the cold source storage area; the negative pressure forming area, the cooling area and the cold source storage area form a near-closed space;
Wherein the cool source storage region includes: the cold source discharging device comprises a side plate, a cold source discharging device and a cover plate;
The side plate and the cover plate enclose a cold source storage area, and the cold source discharge device is connected with the side plate and communicated with the cold source storage area;
A plurality of layers of clapboards are arranged in the cold source storage area, and a plurality of ice balls are placed on the clapboards; the ice balls provide cold sources for the differential pressure precooling system; the cover plate is a detachable cover plate and is used for facilitating the taking and the placing of the partition plate;
And the cold source discharge device is provided with a through hole and is connected with the cooling area.
2. The differential pressure precooling system of claim 1, wherein the cross-section of the baffle is corrugated, and each trough of the corrugated baffle is configured to receive an ice ball.
3. the differential pressure precooling system of claim 2, wherein the ice ball has a diameter greater than a distance between two adjacent peaks of the corrugated partition and less than a distance between an upper layer and a lower layer of the corrugated partition.
4. The differential pressure precooling system of any one of claims 1-2, wherein the cold source storage area further comprises ribs on the side plate for receiving the plurality of baffles.
5. The differential pressure precooling system of any one of claims 1-2, wherein the through-holes are circular and have a diameter of 80-100 mm.
6. The differential pressure precooling system of any one of claims 1-2, wherein the cooling area is one of canvas or plastic cloth.
7. A differential pressure precooling method, characterized in that precooling is performed by using the differential pressure precooling system of any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410843456.4A CN105794953B (en) | 2014-12-30 | 2014-12-30 | Differential pressure precooling system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410843456.4A CN105794953B (en) | 2014-12-30 | 2014-12-30 | Differential pressure precooling system and method |
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| Publication Number | Publication Date |
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| CN105794953A CN105794953A (en) | 2016-07-27 |
| CN105794953B true CN105794953B (en) | 2019-12-17 |
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| CN201410843456.4A Active CN105794953B (en) | 2014-12-30 | 2014-12-30 | Differential pressure precooling system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109393009B (en) * | 2018-12-17 | 2022-03-15 | 韶关学院 | Method for accelerating precooling rate in waxberry vacuum precooling process |
| CN114111147A (en) * | 2021-11-16 | 2022-03-01 | 杭州电子科技大学 | Intelligent pressure difference precooling system for agricultural products by adopting fluidized ice |
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| CN102986842B (en) * | 2012-12-10 | 2013-12-04 | 华南农业大学 | Fruit differential pressure precooling method and device |
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