CN114877627A

CN114877627A - Vacuum low-temperature drying device

Info

Publication number: CN114877627A
Application number: CN202210625879.3A
Authority: CN
Inventors: 王君; 郭俊阳; 李爽
Original assignee: Iks Pvd Technology Shenyang Co ltd
Current assignee: Iks Pvd Technology Shenyang Co ltd
Priority date: 2022-06-02
Filing date: 2022-06-02
Publication date: 2022-08-09
Anticipated expiration: 2042-06-02
Also published as: CN114877627B

Abstract

The invention provides a vacuum low-temperature drying device, which is used for drying grain materials such as corn, soybean and rice at low temperature, and comprises: the drying tower comprises a drying tower main body, a pretreatment chamber, a drying pipeline and a recovery chamber and is used for drying grain materials; the lifting device is used for lifting the grain materials to the drying tower from the bottom of the lifting device; the control device comprises a vacuum pump set and a heating device and is used for carrying out operations of vacuumizing and low-temperature drying on the drying pipeline. The vacuum low-temperature drying device is simple in structure and convenient to assemble and transport, can be used for continuously drying grain crops in batches in a vacuum and low-temperature environment, can ensure that original components, plant activities and nutrient substances in the grain crops are not damaged while the drying quality is improved, can save energy, and greatly improves the economic benefit.

Description

Vacuum low-temperature drying device

Technical Field

The application relates to the technical field of grain drying equipment, in particular to a vacuum low-temperature drying device.

Background

The natural moisture of newly harvested grains is generally 17% -40%, and the safe moisture of stored grains is about 13%, so that the harvested grains need to be dehydrated to reach the safe moisture value for storage.

The existing drying methods for grain materials such as corn, soybean and rice have two kinds, one is natural air drying, the grain materials are placed in a storage bin for natural air drying after being primarily aired, the drying method needs long drying time, is not suitable for drying large batches of grain materials, has poor economic benefit, and has the problems of uneven drying of the grain materials and incapability of reaching the drying and storage standards in the drying process; in addition, because of the poor air permeability of the grain material in natural air drying, the temperature of the core will gradually rise, resulting in the production of particles that do not meet the storage standards, such as mold particles, scab particles, worm-eaten particles, and sprouting particles.

The other method is to adopt the existing dryer to dry the clothes in high temperature and strong wind, and the drying mode needs to ensure the temperature of the drying medium at all times because the drying is carried out at high temperature, so that more energy is wasted and the economical efficiency is poor; meanwhile, the existing heating source is usually coal, and harmful substances generated after the coal is combusted can pollute grain materials, so that the harmful substances in the grain materials are increased; the high-temperature drying mode can also cause heat damage particles in the grain materials and drying heat damage particles; in addition, taking corn as an example, in a high-temperature drying environment, fatty acids in the corn gradually increase along with the increase of temperature and the extension of drying time, the fatty acids in the corn are too high to be stored, which causes waste, the high temperature can also cause corn gelatinization, and starch in the corn cannot be well stored at the high temperature, so that the high-temperature drying method not only wastes energy, but also cannot ensure that original components, plant activities and nutrient substances in the grain materials are not damaged, which causes a series of problems of short storage time, short storage standard, large-batch drying, poor economy and the like.

Therefore, a new drying device is needed.

Disclosure of Invention

In view of the above, in order to overcome the defects of the prior art, the invention provides a vacuum low-temperature drying device, which effectively solves the problems that the existing drying method and drying device cannot dry in large batch, the storage time of the dried grain materials is short, the storage standard cannot be reached, the energy is wasted, the economical efficiency is poor, and the like.

The invention provides a vacuum low-temperature drying device, which is used for drying grain materials such as corn, soybean and rice at low temperature, wherein the vacuum low-temperature drying device comprises a drying tower, a pretreatment chamber, a drying pipeline and a recovery chamber, the pretreatment chamber is arranged at the top of the drying tower body, the recovery chamber is arranged at the bottom of the drying tower body, the drying pipeline is communicated with the pretreatment chamber and the recovery chamber, the drying pipeline is of a multilayer pipeline structure, and the multilayer pipeline structure comprises a grain channel layer and a drying layer which are sequentially outward along the radial direction from the central axis of the pipeline; the lifting device is communicated with the pretreatment chamber and is used for lifting the grain materials to the drying tower from the bottom of the lifting device; and the control device comprises a vacuum pump set and a heating device, the vacuum pump set is communicated with the grain channel layer, and the heating device is communicated with the drying layer.

Preferably, the drying pipeline is detachable multistage structure, multistage structure includes a plurality of vacuum drying district and a plurality of detection zone, is provided with a detection zone between every two adjacent vacuum drying districts.

Preferably, the control device further comprises a water pump, and the heating device is communicated with the drying layer through the water pump; the vacuum pump sets are water ring pumps and roots pumps, the number of the vacuum pump sets is multiple, the vacuum pump sets correspond to the vacuum drying areas one by one, the vacuum pump sets are communicated with the vacuum drying areas through vacuum pipelines, and the vacuum pipelines are provided with recycled water recycling channels.

Preferably, the drying duct is formed as a spiral duct; the multilayer pipeline structure also comprises an insulating layer arranged on the outer peripheral side of the drying layer; the grain channel layer is provided with an auxiliary stirring spacing block.

Preferably, the pretreatment chamber comprises a heating chamber and a feeding chamber, the heating chamber is communicated with the lifting device, the heating chamber is provided with a plurality of preheating sheets, the preheating sheets are communicated with the heating device, and the plurality of preheating sheets are sequentially arranged at intervals from high to low; the heating chamber is communicated with the drying pipeline through the putting chamber.

Preferably, a flow control valve and a stop valve are sequentially arranged between the throwing chamber and the drying pipeline.

Preferably, a flow control valve is disposed between the recovery chamber and the drying duct, and the recovery chamber further includes a temperature detector and a weight detector disposed at a bottom of the recovery chamber.

Preferably, the drying tower further comprises a detection device, the detection device is arranged on the drying pipeline, and the detection device comprises a temperature detector, a water content detector and a vacuum degree detector.

Preferably, the control device further comprises a sand rate device, a carbon filter, a softening device, a reverse osmosis water purification machine, a display screen, a water level meter, a water temperature meter and a water pressure meter, wherein the sand rate device, the carbon filter and the softening device are connected with the heating device, and the reverse osmosis water purification machine is connected with the sand rate device, the carbon filter and the softening device; the water level meter, the water thermometer and the water pressure meter are connected with the display screen.

Preferably, the drying tower main body is a detachable multi-section structure.

The vacuum low-temperature drying device is simple in structure, can be used for continuously drying grain crops in a large scale in a vacuum and low-temperature environment, saves energy, reduces energy consumption and meets the requirement of environmental protection; the problems of thermal damage and the like of the grain materials caused by high-temperature drying are avoided, the drying quality is ensured, the efficiency of production operation is improved, the original components, plant activity and nutrient substances in the grain materials can be reserved, and the storage time is prolonged; and the vacuum low-temperature drying device is a continuous operation device, can realize large-batch grain drying operation without additional operators, reduces the production cost and greatly improves the economic benefit under the condition of improving the drying quality. In addition, this vacuum low temperature drying device does not have extra demand to the operational environment, builds drying tower, hoisting device and controlling means branch modularization, the maintenance management in transportation, assembly and later stage of being convenient for.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic structural view illustrating a vacuum low-temperature drying apparatus according to an embodiment of the present invention;

fig. 2 is a schematic view illustrating a first partial structure of a drying tower of a vacuum low-temperature drying apparatus according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a second part of a drying tower of a vacuum low-temperature drying apparatus according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a third part of a drying tower of a vacuum low-temperature drying apparatus according to an embodiment of the present invention;

FIG. 5 shows a schematic structural diagram of a drying duct according to an embodiment of the invention;

FIG. 6 illustrates a schematic view of another angled configuration of a drying duct according to an embodiment of the present invention;

fig. 7 is a schematic structural view illustrating a quick-release structure of a drying tower according to an embodiment of the present invention.

Reference numerals: 1-a drying tower; 101-a drying tower main body; 102-a pre-chamber; 1021-liter greenhouse; 1022-a delivery room; 1023-a preheat plate; 103-a drying pipeline; 1031-grain passage layer; 1032-drying the layer; 1033-a heat-insulating layer; 1034-a water inlet; 1035-water outlet; 1036-auxiliary stirring spacer; 104-a recovery chamber; 105-a first vacuum drying zone; 106-a first detection zone; 107-first flow control valve; 108-a shut-off valve; 109-pipeline quick connection structure; 110-a filter screen; 111-a fast dismounting structure of the drying tower; 112-a second vacuum drying zone; 113-a second detection zone; 114-a third vacuum drying zone; 115-a third detection zone; 116-a fourth vacuum drying zone; 117-second flow control valve; 118-a first temperature detector; 119-a weight detector; 120-a recovery pipeline; 121-a second temperature detector; 122-vacuum detector; 2-a drying tower hoister; 201-lifting the platform; 202-a base; 203-a feed inlet; 3-raw grain elevator; 4-original granary; 5-dry granary; 6-a control device; 601-a heating device; 602-vacuum pump group; 603-a water pump; 604-sand filters; 605-carbon filter; 606-a softener; 607-reverse osmosis water purification machine; 608-water pressure gauge; 609-water temperature meter; 610-a water level gauge; 611-a display screen; 612-a moving wheel; 7-main water outlet pipe; 8-main water inlet pipe; 9-drying the water inlet pipe of the pipeline; 10-drying the water outlet pipe of the pipeline; 11-vacuum tube; 12-on-off valve; 13-a drain pipe; 1301-recycle channel of recovered water.

Detailed Description

The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, devices, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and/or systems described herein will be apparent to those skilled in the art upon review of the disclosure of the present application. For example, the order of operations described herein is merely an example, which is not limited to the order set forth herein, but rather, may be changed in addition to operations that must occur in a particular order, as will be apparent upon an understanding of the present disclosure. Moreover, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

The features described herein may be embodied in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and/or systems described herein that will be apparent after understanding the disclosure of the present application.

Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on," "connected to," coupled to, "over," or "overlying" another element, it may be directly "on," "connected to," coupled to, "over," or "overlying" the other element, or one or more other elements may be present therebetween. In contrast, when an element is referred to as being "directly on," "directly connected to," directly coupled to, "directly over" or "directly overlying" another element, there may be no intervening elements present.

As used herein, the term "and/or" includes any one of the associated listed items and any combination of any two or more of the items.

Although terms such as "first", "second", and "third" may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section referred to in the examples described herein may be termed a second element, component, region, layer or section without departing from the teachings of the examples.

For ease of description, spatial relationship terms such as "above … …," "upper," "below … …," and "lower" may be used herein to describe one element's relationship to another element as illustrated in the figures. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "upper" relative to other elements would then be oriented "below" or "lower" relative to the other elements. Thus, the term "above … …" includes both an orientation of "above … …" and "below … …" depending on the spatial orientation of the device. The device may also be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative terms used herein should be interpreted accordingly.

The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. The singular forms also are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" specify the presence of stated features, quantities, operations, elements, components, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and/or combinations thereof.

Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, may be expected. Thus, the examples described herein are not limited to the particular shapes shown in the drawings, but include changes in shape that occur during manufacturing.

The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. Further, while the examples described herein have a variety of configurations, other configurations are possible, as will be apparent after understanding the disclosure of the present application.

As shown in fig. 1 to 7, the vacuum low-temperature drying apparatus according to the present invention is used for performing rapid, standardized and continuous drying operations on food materials such as corn, soybean, rice, etc. in a vacuum and low-temperature environment.

The vacuum low-temperature drying device comprises a drying tower 1, a drying tower lifter 2 and a control device 6. In the following description, detailed structures of the drying tower 1, the lifting device, and the control device 6 of the vacuum low-temperature drying apparatus will be described in detail with reference to fig. 1 to 7.

As shown in fig. 1, in the embodiment, the vacuum low-temperature drying device further includes a raw grain elevator 3, a raw grain bin 4, and a dry grain bin 5, where the raw grain elevator 3 may be, for example, a winch, a conveyor belt, etc., and is configured to store grain materials into the raw grain bin 4, and the raw grain bin 4 is connected to the drying tower elevator 2 and is configured to provide the grain materials. The grain materials dried by the vacuum low-temperature drying device are stored in a dry grain bin 5. The raw grain elevator 3, the raw grain bin 4 and the dry grain bin 5 can be devices in the prior art, and specific types, working speeds, storage amounts and the like can be specifically selected according to the amount of grain materials to be dried and the working site, so that the production requirement can be met.

As shown in fig. 1, in the embodiment, the lifting device may be, for example, a drying tower hoist 2, the drying tower hoist 2 may include a lifting platform 201, a base 202, and a feeding opening 203, and the drying tower hoist 2 may lift grain material located in the raw grain bin 4 from the base 202 to the lifting platform 201 and enter the drying tower 1 through the feeding opening 203. The drying tower elevator 2 can be, for example, a winch, a conveyer belt, etc., and the height of the drying tower elevator 2 should be higher than that of the drying tower 1, so as to facilitate the transportation of grain materials.

As shown in fig. 1 to 7, in an embodiment, the drying tower 1 may include a drying tower main body 101, a pretreatment chamber 102, a drying duct 103, and a recovery chamber 104. The head end of the drying pipeline 103 is connected with the pretreatment chamber 102, and the tail end is connected with the recovery chamber 104. Specifically, as shown in fig. 1 to 4 and 7, in an embodiment, drying tower main body 101 may include a multi-segment detachable tower structure that is quickly coupled by drying tower quick-release structure 111, drying tower quick-release structure 111 may be formed, for example, using fastening bolts or as a scaffold structure, etc., and as shown in fig. 7, drying tower quick-release structure 111 may be provided at four sides of the tower structure to ensure overall stability.

As shown in fig. 1 and 2, in an embodiment, the preparation room 102 may include a warming room 1021 and a dosing room 1022. Specifically, the warming chamber 1021 may be formed into a cubic structure cooperating with the drying tower main body 101, a plurality of preheating plates 1023 are arranged in the cubic structure, and the plurality of preheating plates 1023 are arranged in sequence at intervals from high to low (here, it should be noted that, in the embodiment of the present invention, the plurality of preheating plates 1023 are arranged from the lifting platform 201 to the base 202 of the drying tower lifter 2 from high to low, that is, in the vertical direction, the lifting platform 201 is located at a high position, and the base 202 is located at a low position), and the plurality of preheating plates 1023 may be formed into a structure similar to a heating plate, for example, and the interior of the preheating plates 1023 is a hollow circulation passage for low-temperature water heated by the heating device 601 described below. Like this, when grain material enters into intensification room 1021 by feed inlet 203, because receive the influence of gravity, can fall to the bottom of intensification room 1021 by the top of intensification room 1021, at this moment, because the inside of preheating piece 1023 has the low temperature water of circulation and preheating piece 1023 height setting of straggling, consequently, grain material can preheat and carry out coarse mixing in intensification room 1021, guarantee the bulk degree, gas permeability and the homogeneity of the grain material that enters into in dry pipeline 103, can dry more excellently.

As shown in fig. 1 and 2, in an embodiment, the throwing chamber 1022 may be formed in a funnel-shaped structure, an inlet of the funnel-shaped structure has a size matched with a size of a bottom of the warming chamber 1021 to receive the preheated and coarsely stirred grain material, and an outlet of the funnel-shaped structure is connected to the drying duct 103, which may be, for example, a threaded connection, a welded connection, a flange connection, etc., and may be selected according to actual needs to ensure airtightness of the duct connection.

Preferably, as shown in fig. 1 and fig. 2, in the embodiment, a first flow control valve 107 and a stop valve 108 are further disposed between the throwing chamber 1022 and the drying pipeline 103, the first flow control valve 107 is used for controlling the flow rate of the grain material entering the drying pipeline 103, and further controlling the yield of the vacuum low-temperature drying apparatus, and in addition, when the grain material in the drying pipeline 103 is too much, production accidents such as material blockage can be avoided by adjusting the first flow control valve 107. The stop valve 108 is disposed between the first flow control valve 107 and the drying pipeline 103, and can control whether the grain material enters the drying pipeline 103 by opening and closing the stop valve 108, and meanwhile, when the grain material is dried in the drying pipeline 103 at low temperature in vacuum, the air tightness of the drying pipeline 103 can also be ensured by closing the stop valve 108.

As shown in fig. 1 to 7, in an embodiment, the drying duct 103 may be formed as a spiral pipeline, one end of the drying duct 103 is connected to the above-mentioned throwing chamber 1022, and the other end of the drying duct 103 is connected to the below-mentioned recovery chamber 104. Drying duct 103 can include multistage detachable structure to realize quick assembly disassembly through pipeline quick connect structure 109, pipeline quick connect structure 109 can for example be for using fastening bolt and cooperating the mode of airtight circle with two sections pipeline high-speed joint, under the prerequisite of guaranteeing the gas tightness, pipeline quick connect structure 109 can carry out reasonable selection according to actual demand.

As shown in fig. 1 to 4, in an embodiment, the drying duct 103 may include a first vacuum drying zone 105, a first detection zone 106, a second vacuum drying zone 112, a second detection zone 113, a third vacuum drying zone 114, a third detection zone 115 and a fourth vacuum drying zone 116 from high to low, that is, one detection zone is disposed between every two adjacent vacuum drying zones. The four vacuum drying areas can be connected with a vacuum pump set 602 through vacuum pipes 11, and the vacuum drying areas can be used for drying grain crops in vacuum at low temperature; the detection zone is provided with a water content detector (not shown) which can detect the water content of the grain crop dried from the vacuum drying zone and perform real-time feedback to monitor the drying quality. However, without limitation, the number of vacuum drying and detection zones may be selected based on the height of the drying tower and the requirements of the actual manufacturing operation, including but not limited to two, three, four, five, six or more.

Preferably, as shown in fig. 3, in an embodiment, the drying pipeline 103 may further include a detection device, the detection device may include a second temperature detector 121 and a vacuum detector 122, and the second temperature detector 121 and the vacuum detector 122 may detect the temperature and the vacuum degree in the pipeline, so as to ensure that the grain material is always in an environment with a proper temperature and vacuum.

Preferably, each detection zone also includes a shut-off valve 108. A shut-off valve 108 is provided in the detection zone near the vacuum drying zone at the top of the detection zone. Can be through the switching of the stop valve 108 that is located the detection zone, and then realize the substep control to whole pipeline, also can guarantee further to guarantee the gas tightness in vacuum drying district.

As shown in fig. 5 and 6, in the embodiment, the drying duct 103 has a multi-layer duct structure, and includes a grain passage layer 1031 and a drying layer 1032 in sequence along a radial direction from a central axis of the duct, and preferably further includes an insulating layer 1033. The grain channel layer 1031 is a pipeline center and is used for grain materials to pass through, the drying layer 1032 comprises a water inlet 1034 and a water outlet 1035 which are used for low-temperature drying water to pass through, the water inlet 1034 is connected with the heating device 601 through a drying pipeline water inlet pipe 9, and the water outlet 1035 is connected with the heating device 601 through a drying pipeline water outlet pipe 10. Heat preservation 1033 sets up in drying duct 103's outmost, and the inside packing of heat preservation 1033 has insulation material, can keep warm to the low temperature water in stoving layer 1032 effectively, keeps warm to the grain material simultaneously, promotes dry efficiency and reduces thermal loss.

Preferably, as shown in fig. 5 and 6, in the embodiment, the grain passage layer 1031 further includes an auxiliary stirring spacer 1036, and the auxiliary stirring spacer 1036 may be formed in a spiral blade structure, and the center of the blade coincides with the axial center of the pipe. So, because dry pipeline 103 is helical structure, supplementary stirring spacing piece 1036 is helical shape flabellum structure, when grain material passes through grain passageway layer 1031, receives the influence of gravity and can carry out the rolling that does not stop, and then realizes the abundant even being heated when low temperature vacuum drying, promotes dry quality.

Preferably, as shown in fig. 5 and 6, in the embodiment, a filter screen 110 is further disposed at a portion of the grain passage layer 1031 connected to the vacuum tube 11, and when the vacuum pump set 602 is vacuumized on the grain passage layer 1031 through the vacuum tube 11, the filter screen 110 can prevent a portion of grain material from being sucked into the vacuum tube 11 due to the vacuum force, and thus the vacuum pump set 602 is stopped.

Preferably, in the embodiment, in the projection view shown in fig. 1, the drying duct 103 may be regarded as an approximate screw structure, and the lead angle of the screw structure may be 15 ° to 45 °, that is, the included angle between two adjacent ducts may be 30 ° to 90 °, the smaller the angle, the slower the speed of the grain material passing through the drying duct 103, and the longer the drying time, the larger the angle, the faster the speed of the grain material passing through the drying duct 103, and the shorter the drying time. Preferably, in an embodiment, the angle between two adjacent lengths of pipe is 60 °. Because the grain materials pass through the drying pipeline 103 under the action of gravity, when the included angle between two adjacent pipelines is 60 degrees, the grain materials can more quickly and effectively pass through the drying pipeline 103 while considering the drying quality.

As shown in fig. 1 and 4, in an embodiment, the rear end of the drying duct 103 is connected to the recycling chamber 104, the recycling chamber 104 may be formed in an approximately funnel-shaped structure, an inlet of the funnel-shaped structure is communicated with the rear end of the drying duct 103, an outlet of the funnel-shaped structure is communicated with the recycling duct 120, and the recycling duct 120 may be communicated with the dry grain bin 5. The recycling chamber 104 is used for receiving the dried grain materials and conveying the dried grain materials to the dry grain bin 5. Preferably, a second flow control valve 117 is further provided between the recovery chamber 104 and the rear end of the drying duct 103 for controlling the flow rate of the grain material at the rear end of the drying duct 103. Preferably, the bottom of the recovery chamber 104 is further provided with a first temperature detector 118 and a weight detector 119, which can realize real-time monitoring of the temperature and weight of the dried grain material.

As shown in fig. 1 and 4, in an embodiment, the control device 6 may include a heating device 601, a vacuum pump set 602. Specifically, the heating device 601 may be a device having a heating function, such as a boiler or a heater, and may heat the dry water. Preferably, the heating device 601 may deliver the drying water to the drying layer 1032 of the drying duct 103 by the water pump 603. The water outlet of the heating device 601 is communicated with the water inlet of the temperature rising chamber 1021 through a main water outlet pipe 7, and the main water outlet pipe 7 is communicated with the water inlet 1034 of the drying layer 1032 of the drying pipeline 103 through a drying pipeline water inlet pipe 9; the water outlet of the heating device 601 may be communicated with the water outlet of the warming chamber 1021 through the main water inlet pipe 8, and the main water inlet pipe 8 is communicated with the water outlet 1035 of the drying layer 1032 of the drying pipeline 103 through the water outlet pipe 10 of the drying pipeline, so that the circulation process of the low-temperature drying water of the vacuum low-temperature drying device is realized. It should be noted here that each segment of the drying pipeline 103 is provided with a water inlet 1034 and a water outlet 1035, and each vacuum drying area is provided with a set of a drying pipeline water inlet pipe 9 and a drying pipeline water outlet pipe 10, so that when the water inlet 1034 and the water outlet 1035 are not used, the water inlet 1034 and the water outlet 1035 need to be sealed to ensure airtight sealing.

As shown in fig. 1 and 4, in an embodiment, the number of the vacuum pump sets 602 may be multiple, the multiple vacuum pump sets 602 correspond to the multiple vacuum drying zones one by one, and are communicated with the vacuum drying zones through the vacuum pipes 11, where it should be noted that the vacuum pipes 11 may be, for example, two sub-pipes separated from one main pipe as shown in fig. 1 and 4 and respectively communicated with the head end and the tail end of each vacuum drying zone, so as to perform a vacuum pumping operation on the vacuum drying zones, but not limited thereto, the arrangement of the vacuum pipes may be selected according to actual requirements, for example, when the length and the width of the drying pipeline 103 are increased, three sub-pipes may be separated, and a vacuum pumping operation is performed on the head end, the middle end and the tail end of each vacuum drying zone, where it should be noted that the grain channel layers 1031 of the drying pipeline 103 connected to the sub-pipes of the vacuum pipes 11 all need to be installed with the filter screens 110, preventing the grain material from being sucked into the vacuum tube 11.

Preferably, the drying duct inlet pipe 9, the drying duct outlet pipe 10 and the vacuum pipe 11 are all provided with an on-off valve 12, and the on-off valve 12 may be, for example, an electromagnetic valve or the like. The independent control and management of each pipeline can be realized through the on-off valve 12, and the overall flexibility and the universality are improved.

Preferably, the vacuum pump set 602 may be a combination of a water ring pump and a roots pump, and the use of the water ring pump may be more excellent in handling a large amount of water vapor in a vacuum system.

Preferably, the control device 6 may further include a drain pipe 13, one end of the drain pipe 13 is connected to the vacuum pump set 602, and the other end is connected to the heating device 601. When the vacuum pump unit 602 pumps the moisture out of the food crop, the moisture can be discharged through the drain pipe 13. Preferably, the drain pipe 13 is provided with a recycled water recycling channel 1301, and since the moisture of the grain crops pumped out in the vacuum low-temperature drying environment is seed water, the water is a good resource and can be recycled.

Preferably, the control device 6 may further include a sand filter 604, a charcoal filter 605, a softener 606, a reverse osmosis water purification machine 607, a water pressure gauge 608, a water temperature gauge 609, a water level gauge 610, and a display screen 611. The reverse osmosis water purifier 607 is connected with the heating device 601 through the sand filter 604, the carbon filter 605 and the softener 606, so that the water heated by the heating device 601 is softened water, and the water in the pipeline can be effectively prevented from being scaled by the softened water. The water pressure gauge 608, the water temperature gauge 609 and the water level gauge 610 are connected with a display screen 611, and the temperature, the water pressure and the water level of the circulating water can be monitored in real time through the water pressure gauge 608, the water temperature gauge 609 and the water level gauge 610.

Preferably, the control device 6 further comprises a moving wheel 612, as shown in fig. 1 and 4, in an embodiment, the control device 6 may be formed as a container room, and moved and assembled by the moving wheel 612, thereby achieving quick disassembly and assembly of the whole device and facilitating transportation.

It should be noted here that the control device 6 further includes an electric control cabinet, a controller is disposed in the electric control cabinet, both the electric control cabinet and the controller can be devices in the prior art, and the display screen 611 is disposed in the electric control cabinet. The electric control cabinet is connected with each electric component and the detector, and an operator can control the vacuum low-temperature drying device through the electric control cabinet.

The assembly process of the vacuum low-temperature drying device is as follows: firstly, the control device 6 is moved and installed to a work place, then a drying tower main body 101 is built on the side edge of the control device 6 through a drying tower quick assembly and disassembly structure 111, then a warming chamber 1021 and a throwing chamber 1022 are installed, then the drying pipeline 103 is connected through a pipeline quick connection structure 109, the drying pipeline 103 can be fixed with the drying tower main body 101 through a pipeline fixing frame (not shown), a recovery chamber 104 is installed at the tail end of the drying pipeline 103, and the recovery chamber 104 is connected with the dry grain bin 5 through a recovery pipeline 120. And then, a main water outlet pipe 7, a main water inlet pipe 8, a drying pipeline water inlet pipe 9, a drying pipeline water outlet pipe 10, a vacuum pipe 11 and a water outlet pipe 13 are built. And then the grain material in the raw grain bin 4 is connected with the drying tower 1 through the drying tower lifter 2, and the grain material is conveyed to the drying tower 1 through the feeding hole 203. Finally, each detection device is installed and connected.

The use process of the vacuum low-temperature drying device is as follows: because the heating device 601, the vacuum pump set 602 and the water pump 603 of the vacuum low-temperature drying device can respectively control the temperature of the circulating water, the vacuum pressure of the vacuuming and the pressure of the circulating water, the drying requirements of different grain materials can be met by adjusting the parameters of the heating device 601, the vacuum pump set 602 and the water pump 603. The temperature of the circulating water in the heating device 601 is controlled by the control device 6 to be 40-45 ℃ by an operator, and at the temperature, the fatty acid in the corn cannot increase (the fatty acid in the corn increases along with the increase of the storage year), so that the storage time can be additionally increased by drying the corn in a low-temperature environment, and in addition, the starch in the corn cannot be gelatinized due to the drying temperature, and the storage time is also increased. Then, the vacuum pump set 602 and the water pump 603 perform the operations of vacuumizing and circulating drying water, the drying tower elevator 2 conveys the corn in the raw grain bin 4 into the temperature rising chamber 1021 for preheating and rough stirring, and the corn is thrown into the drying pipeline 103 through the throwing chamber 1022, at this time, the vacuum pump set 602 vacuumizes the grain channel layer 1031 of the drying pipeline 103, the moisture in the corn is also sucked out along with the vacuumizing suction force (here, the moisture in the dried corn can be further adjusted by adjusting the vacuumizing suction force, the larger the suction force, the less the moisture in the corn), the circulating water flows through the drying layer 1032 of the drying pipeline 103, and the stability of the working environment temperature is always ensured. After the corn is preliminarily dried through the first vacuum drying area 105, the moisture content in the corn at the moment is detected through the first detection area 106, the vacuum suction force of the second vacuum drying area 112 is adjusted according to the moisture content in the corn at the moment, the moisture content in the corn is detected through the second detection area 113, the drying and the detection are sequentially carried out, and finally, the corn after the drying is completed enters the recovery chamber 104, the temperature and the weight are detected, and finally the corn is conveyed to the dry grain bin 5. When the corn is dried in the drying pipeline 103, the flow can be controlled through the first flow control valve 107 and the second flow control valve 117 at the head end and the tail end of the drying pipeline 103, and the opening and closing operations of the vacuum drying area and the detection area are performed through the stop valve 108, so that the effective production and adjustment in a segmented and step-by-step manner are achieved (for example, when the vacuumizing suction force of one vacuum drying area is too large, the corn is blocked, the upper and lower two stop valves 108 of the vacuum drying area can be closed, the corresponding vacuum pump set 602 is closed, and the stop valve 108 is opened after the pressure is adjusted again). In addition, the operator can monitor each device in real time according to the display screen 611.

The vacuum low-temperature drying device is simple in structure, can be used for continuously drying grain crops in large batches in a vacuum and low-temperature environment, and meanwhile, as the heating medium of the vacuum low-temperature drying device is water and does not need to heat the water at high temperature for a long time, the energy is saved, and the energy consumption is reduced; in addition, because the vacuum low-temperature drying device dries the grain materials in low-temperature and vacuum environments, the heat damage and the like of the grain materials caused by high-temperature drying are avoided, the drying quality is ensured, the efficiency of production operation is improved, the original components, plant activities and nutrient substances in the grain materials can be reserved, and the storage time is prolonged; and the vacuum low-temperature drying device is a continuous operation device, can realize large-batch grain drying operation without additional operators, reduces the production cost and greatly improves the economic benefit under the condition of improving the drying quality. In addition, this vacuum low temperature drying device does not have extra demand to the operational environment, divides the modularization with drying tower 1, hoisting device and 6 building of controlling means, is convenient for transportation, assembly and the maintenance management in later stage.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the exemplary embodiments of the present application, and are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a vacuum low temperature drying device for grain materials such as low temperature stoving maize, soybean and rice, its characterized in that, vacuum low temperature drying device includes:

the drying tower comprises a drying tower main body, a pretreatment chamber, a drying pipeline and a recovery chamber, wherein the pretreatment chamber is arranged at the top of the drying tower main body, the recovery chamber is arranged at the bottom of the drying tower main body, the drying pipeline is communicated with the pretreatment chamber and the recovery chamber, the drying pipeline is of a multilayer pipeline structure, and the multilayer pipeline structure comprises a grain channel layer and a drying layer which are sequentially outward from the central axis of the pipeline along the radial direction;

the lifting device is communicated with the pretreatment chamber and is used for lifting the grain materials to the drying tower from the bottom of the lifting device;

and the control device comprises a vacuum pump set and a heating device, the vacuum pump set is communicated with the grain channel layer, and the heating device is communicated with the drying layer.

2. The vacuum low-temperature drying device according to claim 1, wherein the drying pipeline is a detachable multi-segment structure, the multi-segment structure comprises a plurality of vacuum drying zones and a plurality of detection zones, and one detection zone is arranged between every two adjacent vacuum drying zones.

3. The vacuum low-temperature drying device according to claim 2, wherein the control device further comprises a water pump, and the heating device is communicated with the drying layer through the water pump; the vacuum pump sets are water ring pumps and roots pumps, the number of the vacuum pump sets is multiple, the vacuum pump sets correspond to the vacuum drying areas one by one, the vacuum pump sets are communicated with the vacuum drying areas through vacuum pipelines, and the vacuum pipelines are provided with recycled water recycling channels.

4. The vacuum low-temperature drying device according to claim 1, wherein the drying duct is formed as a spiral duct; the multilayer pipeline structure also comprises an insulating layer arranged on the outer peripheral side of the drying layer; the grain channel layer is provided with an auxiliary stirring spacing block.

5. The vacuum low-temperature drying device as claimed in claim 1, wherein the pre-treatment chamber comprises a heating chamber and a feeding chamber, the heating chamber is communicated with the lifting device, the heating chamber is provided with a plurality of preheating sheets, the preheating sheets are communicated with the heating device, and the plurality of preheating sheets are sequentially arranged from high to low at intervals; the heating chamber is communicated with the drying pipeline through the putting chamber.

6. The vacuum low-temperature drying device according to claim 5, wherein a flow control valve and a stop valve are sequentially arranged between the throwing chamber and the drying pipeline.

7. The vacuum low-temperature drying device of claim 1, wherein a flow control valve is disposed between the recovery chamber and the drying pipeline, and the recovery chamber further comprises a temperature detector and a weight detector disposed at the bottom of the recovery chamber.

8. The vacuum low-temperature drying device according to claim 1, wherein the drying tower further comprises a detection device, the detection device is arranged on the drying pipeline, and the detection device comprises a temperature detector, a water content detector and a vacuum degree detector.

9. The vacuum low-temperature drying device according to claim 1, wherein the control device further comprises:

the device comprises a sand rate device, a carbon filter, a softener, a reverse osmosis water purification machine, a display screen, a water level meter, a water temperature meter and a water pressure meter, wherein the sand rate device, the carbon filter and the softener are connected with a heating device, and the reverse osmosis water purification machine is connected with the sand rate device, the carbon filter and the softener; the water level meter, the water thermometer and the water pressure meter are connected with the display screen.

10. The vacuum low-temperature drying device as claimed in claim 1, wherein the drying tower main body is a detachable multi-stage structure.