CN109945625A - Crawler type heat pump grain dryer - Google Patents
Crawler type heat pump grain dryer Download PDFInfo
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- CN109945625A CN109945625A CN201910206660.8A CN201910206660A CN109945625A CN 109945625 A CN109945625 A CN 109945625A CN 201910206660 A CN201910206660 A CN 201910206660A CN 109945625 A CN109945625 A CN 109945625A
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- 238000001035 drying Methods 0.000 claims abstract description 88
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 18
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
- Y02P60/85—Food storage or conservation, e.g. cooling or drying
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Abstract
The invention discloses a kind of crawler type heat pump grain dryers, including a cube cabinet, it is arranged in the intracorporal multilayer conveyer belt of the bin-cube, the protective device of the entire lower section of every layer of conveyer belt is set, it is arranged in the bamboo rake of the non-equidistant arrangement right above every layer of conveyer belt, the vertical side fan group adjacent with discharge port is set, cube feed inlet of top of the box one end is set, lower part discharge port with feed inlet the same end is set, the moisture exhausting port at the place on the upper side of cube cabinet other end 1/2 is set, the heat pump assembly being connected to cube box house, the gearbox at described cube of cabinet rear is set, the transmission device of drying device right is set.The drying device makes grain drying more evenly, and drying efficiency is improved and do not influenced by interior humidity.
Description
Technical field
The invention belongs to drying device fields, are related to a kind of heat pump drying device.
Background technique
China is populous nation, and grain is the necessity of people's lives, and certain grain reserves are extremely important, therefore grain
Dry technology has vital status in China.Current Condition of Grain-Drying Technology there is heat exchanges low, uneven drying
The problem of, it causes energy utilization rate not high and will lead to the rotten waste of grain.The exhaust gas that drying process generates simultaneously not only pollutes
Environment and be easily accessible drying device make it is dry after grain contain harmful components.Heat pump drying is a kind of to shift low level heat energy
For the drying technology of high-order heat source, dry products quality is good, and dry range is wide, and low energy consumption, pollution-free, energy conservation and environmental protection, symbol
Close current energy policy and development trend.
Vertical ventilation type heat pump thermostat is served back under the application for a patent for invention of Publication No. 104997139A is a kind of, benefit
The characteristics of being flowed up with hot-air uses down the air supply mode served back to improve air current composition, reduces energy consumption.But this send
Wind mode causes air themperature difference in vertical direction, causes grain drying uneven, reduces drying quality, drying effect is not
It is good, it is easy to produce quick-fried waist phenomenon.
A kind of temperature swing type grain dryer of the application for a patent for invention of Publication No. 106561806A, drying device is divided into
Five modules, since food import, what the air inlet of first irradiation modules introduced is dry-heat air, and temperature is 35~45
DEG C, what the air inlet of second irradiation modules introduced is dry-heat air, and temperature is 55~65 DEG C, the air inlet of third irradiation modules
What mouth introduced is hot wind, and temperature is 65~75 DEG C, and what the air inlet of the 4th irradiation modules introduced is hot wind, and temperature is 65~75
DEG C, what the air inlet of the 5th irradiation modules introduced is cooling wind, and temperature is 35~45 DEG C.Improve drying grain quality and production
Amount.But the influence for sending wind velocity, environment temperature and ambient humidity back to drying device is had ignored, cause energy waste.
A kind of belt temperature swing type cereal heat pump drying device of the application for a patent for invention of Publication No. 106568317A, using side
The air supply mode for sending side to return, is mounted on conveyer belt for air outlet, return air inlet hereinafter, grain is avoided to be blown away.But it blows
Mouth, return air inlet size are fixed, and air outlet, return air inlet size needed for can not choosing according to actual drying device volume make to blow
Mouthful and return air inlet is excessive causes grain to be blown away or siphon away or make air outlet or return air inlet is too small causes to be unable to satisfy inner air
Forced convertion is unevenly distributed air current composition.
Summary of the invention
Technical problem: the present invention provides one kind can effectively promote drying efficiency and grain drying quality, improves energy benefit
With rate, energy consumption, environmental-friendly crawler type heat pump grain dryer are reduced.
Technical solution: crawler type heat pump drying device of the invention, including cube cabinet, setting are in the bin-cube body
Multilayer conveyer belt, be arranged in below every layer of conveyer belt protective device, be arranged in right above every layer of conveyer belt bamboo rake, setting
Feed inlet at the top of cube cabinet one end, is arranged in a cube cabinet lower part discharge port that the same end on cube cabinet is arranged in
The moisture exhausting port at the place on the upper side of the other end 1/2, the heat pump assembly being connected to cube box house are adjacent with discharge port on cube cabinet
Vertical side is provided with multiple fan groups, is provided with air outlet between two adjacent fan groups, is provided on the side wall of cube cabinet
Return air inlet.
Further, in apparatus of the present invention, described cube of box house is equipped with four layers or four layers or more and is even level
Conveyer belt, as conveyer belt number of plies N=4, the functional relation of described cube of cabinet wide M and high H are as follows: H=M；As conveyer belt number of plies N
When > 4, the functional relation of described cube of cabinet wide M and high H are as follows: H=0.24*N*M, lowest level transmit strip length L3And bin-cube
The length L of body1Functional relation are as follows: L3=0.98*L1.There are k bamboo rake, bamboo rake spacing distance right above lowest level conveyer belt
With transmission strip length L3Functional relation are as follows: d8=(0.11~0.12) * L3, the grain upstream end with conveyer belt is at a distance of d9=
(0.05~0.06) * L3, remaining transmission strip length L2With the length L of cube cabinet1Functional relation are as follows: L2=0.95*L1, at it
There are j bamboo rake, and j > k, bamboo rake spacing distance and transmission strip length L right above every layer of remaining conveyer belt2Functional relation are as follows: d8
=(0.11~0.12) * L2, with conveyer belt grain upstream end at a distance of d9=(0.05~0.06) * L2.The protective device is concave surface
Pallet does not have partition at direction of transfer both ends, and protective device is apart from 0.01 ± 0.005m of conveyer belt downside, the wide a of protective device1
With conveyor width a2Functional relation are as follows: a1=1.125*a2- 0.025, protective device height b1With transmission tape thickness b2Letter
Number relationship are as follows: b1=1.28*b2。
It further, include inside air-supply passage in the heat pump assembly, inside return air channel, outer in apparatus of the present invention
The inlet end in Lateral supply channel, outside return air channel, heat pump, the condenser in the heat pump is connected with inside air-supply passage, cold
The outlet side of condenser is connect with inside return air channel, and the refrigerant inlet of the evaporator in heat pump is connect with outside return air channel,
The refrigerant outlet of evaporator is connect with outside air-supply passage, is also mutually connected between outside air-supply passage, outside return air channel,
Inside air-supply passage is connect with the air outlet of cube cabinet, and the first air-valve is housed at air outlet, and condenser is logical by inside return air
Road is connect with return air inlet, and the second air-valve is housed at return air inlet, and air-supply passage is equipped with third air-valve on the outside, and return air is logical on the outside
Road is equipped with the 4th air-valve, and air-supply passage and outside return air channel junction are equipped with fresh wind port on the outside, is equipped with the 5th at fresh wind port
Air-valve, heat pump assembly number n3With bin-cube body length L1Functional relation are as follows: n3=[L1/ 5+0.5], fresh wind port width a3With it is vertical
Square box L1Functional relation are as follows: a3=0.14*L1/n3, fresh air open height b3With a cube functional relation of box height H are as follows: b3
Filter screen is arranged at return air inlet, is not provided with filter screen before condenser and evaporator by=0.12*H.
Further, in apparatus of the present invention, heat pump assembly sends out high-temperature gas by air outlet, and high-temperature gas does grain
Temperature decline after dry, humidity increase, which is heated to be by moisture is precipitated again by heat pump assembly after return air inlet return air
High-temperature gas is sent out by air outlet, and the moisture of grain is discharged by the circulation.
Further, in apparatus of the present invention, first air-valve and the second air-valve and horizontal direction angle at 0 °~15 °,
Control air-supply, return air speed is fixed on 0.5m/s hereinafter, air outlet and return air inlet are equal in magnitude, the wide a of air outlet and return air inlet4
With the long L of cube cabinet1Functional relation be a4=0.0265*L1+ 0.01, the high b of air outlet and return air inlet4With the high H of cube cabinet
Functional relation be b4=0.308*H, air outlet is equal with return air inlet number, air outlet number n1=0.04*H*L1/(a4*b4)。
Further, in apparatus of the present invention, the air outlet and return air inlet are arranged on the same side wall of cube cabinet, send
Air port is arranged between two adjacent return air inlets, and the interval of air outlet and adjacent two return air inlet is d1=(L1-2n1*a4-2)/
(2n1- 1), air outlet and return air inlet lower boundary distance cube bottom of box d2=0.07*H+0.05.
Further, in apparatus of the present invention, the air outlet is corresponding up and down in cube cabinet the same side wall with return air inlet
Setting, air outlet and return air inlet are between the upper and lower every d3=0.1*H is divided into d between every group of air outlet air outlet adjacent with horizontal side4=
(L1-n1*a4)/(n1+ 1), lowest level air port lower boundary distance cube bottom of box d5=0.1*H+0.03.
Further, in apparatus of the present invention, air outlet is arranged on a side wall of cube cabinet, and return air inlet setting is vertical
On the side wall of square box opposite direction, air outlet and return air inlet are corresponded, and air outlet setting position is lower than return air inlet position, air-supply
Mouth lower boundary distance cube bottom of box d5=0.1*H+0.03, return air inlet lower boundary distance cube bottom of box d8=0.508*H
+ 0.03, it is d that the spacing of two neighboring air outlet is identical as the spacing of two neighboring return air inlet4=(L1-n1*a4)/(n1+
1)。
Further, in apparatus of the present invention, air outlet is arranged on a side wall of cube cabinet, and return air inlet setting is vertical
On the side wall of square box opposite direction, air outlet and return air inlet are corresponded, and return air inlet setting position is lower than location of air supply inlet, return air
Mouth lower boundary distance cube bottom of box d5=0.1*H+0.03, air outlet lower boundary distance cube bottom of box d8=0.508*H
+ 0.03, it is identical at a distance from the distance of two neighboring air outlet, with two neighboring return air inlet, it is d4=(L1-n1*a4)/(n1+
1)。
Further, in apparatus of the present invention, moisture exhausting port equidistantly distributed in the horizontal direction is equipped at each moisture exhausting port
6th air-valve.
Further, in apparatus of the present invention, moisture exhausting port is square, and side length c and the functional relation of the wide M of cube cabinet are
C=0.06*M, moisture exhausting port number n2[0.0148*M*H/c2+ 0.5], moisture exhausting port interval d6=(H-1.05-n2*c)/(n2- 1) it, arranges
Cube cabinet (1) distance from bottom d is arrived at wet mouth lower boundary7=0.82*H.
Further, in apparatus of the present invention, moisture exhausting port is circle, diameter dvWith the functional relation of a cube cabinet (1) width M
For dv=0.0849*M, moisture exhausting port number n2[0.0148*M*H/dv 2+ 0.5], moisture exhausting port interval d6=(H-1.05-n2*dv)/
(n2- 1) cube cabinet distance from bottom d, is arrived at moisture exhausting port lower boundary7=0.82*H.
Further, in apparatus of the present invention, filter screen is set at the return air inlet, is not set before condenser and evaporator
Set filter screen, air when return air, inside filtration drying device.
Further, in apparatus of the present invention, the moisture exhausting port is connected with blower, is arranged in the 1/ of the opposite end face of feed inlet
It at 2 upper positions, is uniformly distributed in the horizontal direction, drying device interior humidity desired value is 14%, when humidity is greater than the phase
When prestige value, starts hydrofuge, air-valve is housed at moisture exhausting port, can be continuously adjusted completely from 0~100%, by reducing in bin-cube body
Relative humidity, increase grain evaporating surface moist gradient, accelerate moisture evaporation.
Further, in apparatus of the present invention, the bamboo rake is arranged in right above every layer of conveyer belt, wherein transmitting in lowest level
There is k bamboo rake in band surface, remaining every layer transmission has j bamboo rake, and j > k, bamboo rake spacing distance d8=(0.11~
0.12) * L, the grain upstream end with conveyer belt is at a distance of d9=(0.05~0.06) * L keeps grain distribution more uniform, and then makes
Grain drying is abundant, avoids the quick-fried waist of grain.
Further, in apparatus of the present invention, the fan group is located at air outlet side, and every four fans are one group, every group
Fan is distributed in matrix pattern, carries out forced convertion to device internal gas flow.
Further, in a kind of embodiment of apparatus of the present invention, air supply mode is that ipsilateral side send side to return, air outlet, return air
Mouth is evenly distributed on cube cabinet equipped in the same horizontal line of fan group side, is blown with constant wind quantity.
Further, in a kind of embodiment of apparatus of the present invention, air supply mode is to send next time on ipsilateral, air outlet, return air
Mouth is that ipsilateral distribution, air outlet up and down are located above, and return air inlet is located below, and is evenly distributed on cube cabinet equipped with fan group one
Side is blown with constant wind quantity.
Further, in a kind of embodiment of the invention, air supply mode is to send next time on heteropleural, and air outlet, return air inlet are
Heteropleural is distributed up and down, and air outlet is located above, and return air inlet is located below, every group of air outlet, return air inlet interval d4=(L1-n1*
a4)/(n1+ 1), return air inlet lower part distance cube bottom of box d5=0.1*H+0.03, air outlet lower boundary distance cube cabinet bottom
Portion d6=0.2*H+0.03.
Further, in a kind of embodiment of the invention, air supply mode is to serve back under heteropleural, and the air port of sending back to is different
Side is distributed up and down, and air outlet is located below, and return air inlet is located above, every group of air outlet, return air inlet interval d4=(L1-n1*a4)/
(n1+ 1), air outlet lower boundary distance cube bottom of box d5=0.1*H+0.03, the return air inlet lower boundary distance cube bottom of box
d6=0.2*H+0.03.
In the above-mentioned all calculation formula of the present invention and functional relation, bringing numerical value unit into is rice.
The utility model has the advantages that compared with existing heat pump grain dryer, the invention has the following advantages that
The invention proposes the relativeness of cube cabinet size and the conveyer belt number of plies and length and define transmission belt
Number, at present in heat pump drying device, volume and the conveyer belt number of plies are definite value, if the conveyer belt number of plies is excessive or very few, to cube
Box volume does not have qualifications, can bring about the waste of occupied area and scattering and disappearing for drying device upper space hot-air,
Change cube box volume by changing the conveyer belt number of plies, space occupied can be saved, make full use of a cube box house
Free convection, heat pump is sent, the quasi- laminar flow of return air (turbulent flow) and lower part wind pushing air heat radiation collective effect, makes temperature in drying device
Control in effective range, and make inlet port and outlet port heat pump temperature and environment temperature difference within 10 DEG C, can
Prevent the quick-fried waist phenomenon of grain.
The invention proposes the relativeness of protective device and conveyer belt, are with currently without protective device or protective device
The drying device of fixed size is compared, and avoids protective device wide or narrow to which the effect for preventing grain from falling be not achieved.
The invention proposes the relativeness of heat pump assembly number and bin-cube body length, fill in existing heat pump grain drying
In setting, heat pump assembly number is few, and drying device internal temperature is low and unevenly causes grain drying insufficient, and local grain has
Quick-fried waist is not occurred by dry phenomenon, and heat pump assembly number is more, causes the waste of early investment.By with existing heat pump grain
The comparative experiments of drying device is analyzed, and heat pump assembly number is limited, and the drying effect for generating heat pump assembly meets cube cabinet
It is dry necessary to size to require, avoid the problem that grain drying is insufficient or early investment wastes.
Heat pump assembly of the invention is equipped with air-valve compared with conventional heat pump device at each air port, can be by changing
Become air-valve tilt angle, and then change supply air temperature, mixed in air-supply passage by cold-hot wind, increases supply air temperature range
Add, to meet different grain drying temperature requirements；Change simultaneously air supply velocity, control velocity interval 0m/s~0.5m/s it
Between, and then change the moist gradient on grain surface, reduce influence of the initial moisture percentage of grain to rate of drying.
By the way of heat pump assembly of the invention is combined using two air blow and return channels, compared with conventional heat pump device, addition
Outside air-supply passage, outside return air channel and fresh wind port are equipped with the 5th air-valve at fresh wind port, for adjusting fresh air volume, new
Fresh air is introduced at air port increases air quantity inside drying device, and evaporating pressure improves, and then increases Energy Efficiency Ratio, makes device more supernumerary segment
Can, it can be directed to varying environment temperature, humidity, adjusting air valve angle controls supply air temperature and speed, avoids grain drying quality not
It is good.
Air outlet of the invention and return air inlet are equal in magnitude, in existing heat pump drying device, air outlet, return air open area
For definite value, return air inlet speed is bigger than air outlet speed, therefore when air quantity is identical, and return air inlet area ratio air-supply open area is big, by
It is fixed in area, the requirement of wind speed required for different size of drying device is not achieved, the excessive grain that will lead to of wind speed is blown
It walks, wind speed is too small to will lead to drying device internal gas flow nonuniform organization, by making air outlet, return air inlet size by drying device
Size determines, air-supply and return air velocity magnitude can be made preferably, avoids wind speed excessive or too small situation occurs.
Moisture exhausting port of the invention is arranged at 1/2 upper position of the opposite end face of feed inlet, in the horizontal direction uniformly
Distribution, drying device interior humidity desired value are 14%, when humidity is greater than the desired value, starts hydrofuge, are equipped at moisture exhausting port
Air-valve can continuously adjust completely from 0~100%.In existing drying device, moisture exhausting port is located in the side adjacent with feed inlet
Portion position or feed inlet opposite medium position, since one timing of water capacity, humid air temperature increase in humid air, rh value
Increase, meanwhile, temperature increases so that moisture evaporation rate is accelerated, and the water capacity increase in air causes relative humidity to increase, heat
Air and vapor are spread upwards and the vapor in air is spread with hot wind to low temperature part, and experiment is measured close to discharge port
Temperature is higher than outdoor air dry-bulb temperature, and discharge port opposite temperature is close to outdoor air dry-bulb temperature, thus vapor towards
The aggregation of discharge port opposite end face is arranged moisture exhausting port in this end face, can make the hydrofuge time so that the position rh value increases
It reduces, moisture exclusion efficiency increases, and increases drying efficiency indirectly, the moisture exhausting port of existing drying device is unable to reach the optimal effect of hydrofuge
Fruit.
The present invention the vertical lateral inner of drying device be equipped with fan group, in existing drying device, fan be located at cube
Top of the box the air current composition to air outlet, return air inlet can not carry out forced convertion and upset positioned at upper space in time
Thermal current reduces drying effect, and by keeping fan group and air outlet, return air inlet ipsilateral, forced convertion makes gas inside drying device
It flows tissue more evenly, avoids grain coking uneven drying.
The present invention illustrates 4 kinds of different air blow and return modes, respectively ipsilateral side send side to return, it is ipsilateral on send next time, on heteropleural
It send next time, serve back under heteropleural, variety classes air supply mode can be selected according to specific implementation condition.
The present invention is equipped with filter screen at return air inlet, is not equipped with filter screen before condenser and evaporator, avoids energy
Loss and waste of material solve nothing compared with existing drying device is only before condenser and evaporator equipped with filter screen
Method filters out the problem of small diameter particles object existing for drying device inside in turn results in grain contamination.The present invention uses gearbox
Crawler-tread speed is controlled, it, can be by crawler belt speed of service tune when the grain moisture of required drying is higher, and stacking thickness is larger
Slowly, drying time is lengthened, improves drying effect；When the grain moisture of required drying is lower, and stacking thickness is moderate, adjustable height
The crawler belt speed of service promotes drying efficiency.
The present invention installs bamboo rake on every layer of crawler attachment, keeps grain evenly dispersed, keeps thickness uniform.When one section
Between harrow primary, distribute moisture faster and dry more sufficiently, avoid the occurrence of over-drying or dry halfway shape
Condition.
Detailed description of the invention
Fig. 1 is crawler type heat pump grain dryer external structure
Fig. 2 is the main view of crawler type heat pump grain dryer internal structure
Fig. 3 is the side view of crawler type heat pump grain dryer internal structure
Fig. 4 is the air blow and return access diagram of crawler type heat pump grain dryer
Fig. 5 is the fan group relative position schematic diagram of crawler type heat pump grain dryer
Fig. 6 is heat pump principle figure
Fig. 7 is to send air supply mode schematic diagram next time on ipsilateral
Fig. 8 is to send air supply mode schematic diagram next time on heteropleural
Fig. 9 is to serve loopback wind schematic diagram under heteropleural
Mark meaning is as follows in attached drawing:
1- cubes of cabinet, 2- feed inlet, 3- discharge port, 4- moisture exhausting port, 5- observation panel, 6- air outlet, 7- return air inlet, in 8-
Lateral supply channel, return air channel on the inside of 9-, air-supply passage on the outside of 10-, return air channel on the outside of 11-, 12- transmission device, 13- speed change
Case, 14- fresh wind port, 15- heat pump cabinet, 16- evaporator, 17- condenser, 18- compressor, 19- electric expansion valve, 20- four-way
Reversal valve, the two-way liquid reservoir of 21-, 22- gas-liquid separator, the first air-valve of 23a-, the second air-valve of 23b-, 23c- third air-valve,
The 4th air-valve of 23d-, the 5th air-valve of 23e-, the 6th air-valve of 23f-, 24- conveyer belt, 25- fan group, 26- bamboo rake, 27- protection dress
It sets
Specific embodiment
More specific detail is made to technical solution of the present invention below with reference to embodiment:
As depicted in figs. 1 and 2, a kind of crawler type heat pump grain dryer, including cube cabinet 1, setting are described vertical
Four layers of conveyer belt 24 in square box 1, are arranged in every layer of transmission at the protective device 27 that the entire lower section of every layer of conveyer belt 24 is arranged in
The bamboo rake 26 of non-equidistant arrangement with 24 surfaces is arranged in the vertical side fan group 25 adjacent with discharge port 3, is arranged in wind
3 observation panels 5 on 25 opposite of fan group, the feed inlet 2 that 1 top one end of cube cabinet is set, setting with 2 the same end of feed inlet
Lower part discharge port 3, the place on the upper side of 1 other end of cube cabinet 1/2 is set 4 moisture exhausting ports 4, be connected to inside cube cabinet 1
Heat pump assembly, the transmission device 12 outside cube cabinet 1 is set, the gearbox 13 at 1 rear of cube cabinet is set.
It as shown in Figure 4 and Figure 6, include inside air-supply passage 8, inside return air channel 9, outer Lateral supply in the heat pump assembly
Channel 10, outside return air channel 11, heat pump, the heat pump power are 35kW, it is expected that outlet temperature is 75 DEG C, thick equipped with 30mm
Insulating layer.The inlet end of condenser 17 in the heat pump is connected with inside air-supply passage 8, the outlet side and inside of condenser 17
Return air channel 9 connects, and the refrigerant inlet of the evaporator 16 in heat pump is connect with outside return air channel 11, the refrigeration of evaporator 16
Agent outlet is connect with outside air-supply passage 10, is also mutually connected between outside air-supply passage 10, outside return air channel 11, inside is sent
Wind channel 8 is connect with the air outlet 6 of cube cabinet 1, and the first air-valve 23a is housed at air outlet 6, and condenser 17 passes through inside return air
Channel 9 is connect with return air inlet 7, and the second air-valve 23b is housed at return air inlet 7, and air-supply passage 10 is equipped with third air-valve on the outside
23c, return air channel 11 is equipped with the 4th air-valve 23d on the outside, and air-supply passage 10 is set with 11 junction of outside return air channel on the outside
Have a fresh wind port 14, the 5th air-valve 23e be housed at fresh wind port 14, as shown in fig. 6, the heat pump include compressor 18, condenser 17,
Electric expansion valve 19, evaporator 16, two-way liquid reservoir 21, gas-liquid separator 22, four-way reversing valve 20.Its working principles are as follows:
When heat pump assembly provides hot wind, compressor 18 sends out the refrigerant vapour of high temperature and pressure, and refrigerant vapour flows into four-way commutation
Valve 20, into condenser 17, the refrigerant in condenser 17 carries out heat exchange with by the wind of inside return air duct 9, then leads to
It crosses inside air-supply passage 8 to send out hot wind, while refrigerant is condensed into highly pressurised liquid and flows into two-way liquid reservoir 21, then passes through electronics
Expansion valve 19, which is depressured, becomes the gas-liquid mixture of low-temp low-pressure, enters back into evaporator 16, the refrigerant in evaporator 16 with pass through
The wind of outside return air channel 11 and the fresh air entered by fresh wind port 14 carry out heat exchange, then on the outside air-supply passage 10 with it is interior
Wind is sent out after the hot wind mixing in Lateral supply channel 8, refrigerant is vaporizated into low-pressure gas at this time, into four-way reversing valve 20, gas
Liquid/gas separator 22 has finally reentered compressor 18, has looped back and forth like this.
When heat pump assembly provides dry cold wind, the high-temperature high-pressure refrigerant steam that compressor 18 is discharged commutates through four-way
Valve 20 enters condenser 17, and refrigerant vapour is condensed into liquid, sequentially enters two-way liquid reservoir through the expansion of electric expansion valve 19
21 and evaporator 16, the refrigerant in evaporator 16 enters new with the wind by outside return air channel 11 and by fresh wind port 14
Wind carries out heat exchange, is then sent out cold wind by outside air-supply passage 10, while the refrigerant in evaporator 16 enters four-way
Reversal valve 20, gas-liquid separator 22, finally reenter compressor 18, loop back and forth like this.
Verification experimental verification has been carried out to effect of the present invention, has selected 425 type hot type anemobiagraph of TESTO to acquire wind in verification test
Fast data select 6 type thermocouple temperature sensor temperature collection data of CHINO VT, select VAISALA HMT120 temperature and humidity
Sensor acquires humidity data, and air velocity is measured by anemobiagraph in caloic exchange area during test, and hot air temperature is logical
Cross thermocouple measurement.When acquiring test data in real time using hot type anemobiagraph, the average value of 30s is recorded as single measuring point single
Measuring wind speed data, each measuring point record 5 times, and air speed value and temperature value for the measuring point are averaged after removal extreme value.This hair
Measuring point distribution carried out to drying device model during bright test, in the short transverse of internal caloic exchange area, adjacent measuring point spacing
It is 0.5m, measuring point distribution is carried out at Z=0mm, Z=0.5mm, Z=1.0mm, Z=1.5mm, Z=2.0mm, Z=2.5m,
On the length direction of internal caloic exchange area, adjacent measuring point spacing 2m, in X=0m, X=2m, X=4m, X=6m, X=8, X=
Measuring point distribution is carried out at 10m, X=12m, X=14m, X=16m, X=18, X=20m, X=22m, X=24m, X=26m, it is internal
In the width direction of caloic exchange area, adjacent measuring point spacing 0.5m, in Y=0mm, Y=0.5mm, Y=1.0mm, Y=1.5mm, Y=
Measuring point distribution is carried out at 2.0mm, Y=2.5m, arranges 504 measuring points altogether in the test.Humidity measuring point takes short transverse Z=
1.5m, Z=2.0m, Z=2.5m, the total measuring point number of humidity are 252, record a data every 20min, single records 4 surveys
The transient temperature and instant moisture of point, each measuring instrument transformation period select 10s.The calculation that this experiment passes through every layer of measuring point temperature
The inverse of total duration needed for art mean difference and blower hydrofuge respectively indicates heat loss and moisture exclusion efficiency, the evaluation index of this experiment
Are as follows: nonuniformity coefficientIn formula, viRefer to the speed of single measuring point i in every layer,Refer to the average speed of every layer of measuring point,
Value shows that more greatly air current composition distribution is more uneven；Pressure-drop coefficientIn formula, piRefer to that single measuring point i's in every layer is quiet
Pressure,Refer to every layer of measuring point air-supply average static pressure, value shows that more greatly the air supply efficiency of supply air duct under the structure is higher.
The conveyer belt number of plies is in three layers and three layers of heat pump drying device below, if to reach drying of the invention at present
It is required that occupied area is at least 2 times of occupied area of the present invention, heat pump assembly number used is at least the present invention and is filled using heat pump
2 times for setting number, since heat pump assembly number is excessive and occupied area is excessive, it is naturally right using cube box house to be unable to fully
Stream, will cause drying device internal gas flow and is unevenly distributed, and make 5 times that nonuniformity coefficient is of the invention, and pressure-drop coefficient is this hair
Bright 1/12, heat loss rate is of the invention 3 times, and then makes inside drying device that there are local hot spots, causes the quick-fried waist of grain
Phenomenon.
In existing heat pump drying device, return air inlet area ratio air-supply open area is big, thus when air quantity is identical, return air inlet
Speed is bigger than air outlet speed, and air outlet, return air speed are different, makes occur flow perturbation inside drying device, makes air current composition
Irrational distribution, nonuniformity coefficient are of the invention 3 times, and pressure-drop coefficient is of the invention 1/8, and heat loss rate is of the invention 3
Times, since return air speed is greater than 2m/s, it will cause the phenomenon that grain is sucked away.
In existing heat pump drying device, without fresh wind port, fresh air can not be introduced, but constantly row inside drying device
It is wet, cause air quantity inside drying device to reduce, so that evaporating pressure declines, compared with apparatus of the present invention, Energy Efficiency Ratio is reduced
20%, it is unable to satisfy energy-saving effect.
In existing heat pump drying device, moisture exhausting port is located at the side medium position adjacent with feed inlet or feed inlet opposite
Medium position will lead to top layer's conveyer belt and its since the two faces are not the internally dry degree minimum position of drying device
Remaining conveyer belt is greater than hydrofuge desired value far from humidity at discharge port position, and grain moisture and the other places grain moisture of the part are compared
Increase, compared with the present invention, the hydrofuge moment is postponed, and hydrofuge total duration increases by 40%, and moisture exclusion efficiency reduces.
In existing drying device, filter screen only is set before condenser and evaporator, filter screen is not provided at return air inlet,
So that small diameter particles object existing for inside drying device can not be filtered, keeps the air-flow sent out contaminated, further result in grain
Food is contaminated.
It is not provided with fan inside existing heat pump drying device, air outlet is only relied on and return air inlet bring pressure difference forces inside
Cross-ventilation, this mode convection effects are bad, and are unfavorable for device internal gas flow even tissue, and nonuniformity coefficient is the present invention
4 times, pressure-drop coefficient is of the invention 1/9, and is easy to make grain coking.
Air port is not provided with air-valve inside existing drying device, causes under the conditions of identical air quantity, can not adjust air blow and return
Speed and temperature make supply air temperature definite value, can not carry out in a certain range according to preference temperature required for grain quality
It adjusts, when to grain drying with same humidity, the 25% of original drying efficiency is can be improved in the present invention.
In a preferred embodiment of the present invention 1, air blow and return mode is that ipsilateral side send side to return.Among drying device top
Position flow velocity is larger and end positions flow velocity is smaller；There are larger wind speed, face location of air supply inlet in drying device location of air supply inlet
Wind speed is smaller.Decay in air outlet lower position air velocity with the reduction of drying device height, horizontal plane where return air inlet
Overdraught Tissue distribution is relatively uniform.Generally, ipsilateral side send side to return wind pushing form, air in horizontal direction and vertical direction
Flow velocity is relatively uniform.Compared with existing side send side to return air supply mode, which can make air circulation jet reach drying
Before area, compared with air in bin-cube body it is sufficient mix, velocity field and temperature field all tend to uniform stabilization,
Nonuniformity coefficient is that existing side send side to return the 1/8 of air supply mode, and pressure-drop coefficient is 11 times that side time air supply mode is sent in existing side, heat
Loss late is that existing side send side to return the 1/3 of air supply mode, therefore can guarantee the uniformity of workspace air-flow and temperature.
When outdoor is in humid tropical condition, i.e. air dry-bulb temperature is greater than 33 DEG C, and less than 45 DEG C, air's wet bulb temperature is big
In 27 DEG C, when less than 29 DEG C, adjusting the first air-valve and horizontal direction angle is 0 °, the second air-valve and horizontal direction angle be 0 °~
7 °, third air-valve and horizontal direction angle are 0 °~15 °, and the 4th air-valve and horizontal direction angle are 15 °~30 °, the 5th air-valve
It is 30 °~45 ° with horizontal direction angle.When outdoor is in wet condition in low temperature, i.e. air dry-bulb temperature is greater than 18 DEG C, less than 23
DEG C, it when relative humidity is 70%~80%, adjusts the first air-valve and horizontal direction angle is 0 °, the second air-valve and horizontal direction are pressed from both sides
Angle is 30 °~45 °, and third air-valve and horizontal direction angle are 0 °~15 °, and the 4th air-valve and horizontal direction angle are 0 °~30 °,
5th air-valve and horizontal direction angle are 15 °~30 °.
In a preferred embodiment of the present invention 2, air supply mode is to send next time on ipsilateral.Send back to air port between the upper and lower every
0.24m, return air inlet lower part distance cube bottom of box 0.24m, every group is sent back to air port interval 3.76m.It is horizontal where air outlet
Air velocity is larger at face, and speed has slight fading, horizontal plane lower position air velocity where air outlet at the horizontal plane
It reduces, horizontal direction air velocity is more uniform.Generally, send wind pushing form horizontal direction distribution next time more equal on ipsilateral
Even, uniformity is general in vertical direction.Compared with sending air supply mode next time on existing, which can form concurrent flow
Flow pattern, vortex is few, and section velocity field is uniform, can be effectively improved air velocity in vertical direction and differ larger situation, uneven
Even coefficient is to send the 1/5 of air supply mode next time on existing, and pressure-drop coefficient is 8 times that air supply mode next time is sent on existing, heat loss
Rate is 1/3 that air supply mode next time is sent on existing.
When outdoor is in humid tropical condition, i.e. air dry-bulb temperature is greater than 33 DEG C, and less than 45 DEG C, air's wet bulb temperature is big
In 27 DEG C, when less than 29 DEG C, adjusting the first air-valve and horizontal direction angle is 0 °, the second air-valve and horizontal direction angle be 5 °~
10 °, third air-valve and horizontal direction angle are 0 °~15 °, and the 4th air-valve and horizontal direction angle are 15 °~30 °, the 5th air-valve
It is 30 °~45 ° with horizontal direction angle.When outdoor is in wet condition in low temperature, i.e. air dry-bulb temperature is greater than 18 DEG C, less than 23
DEG C, it when relative humidity is 70%~80%, adjusts the first air-valve and horizontal direction angle is 0 °, the second air-valve and horizontal direction are pressed from both sides
Angle is 30 °~45 °, and third air-valve and horizontal direction angle are 0 °~15 °, and the 4th air-valve and horizontal direction angle are 0 °~30 °,
5th air-valve and horizontal direction angle are 15 °~30 °.
In a preferred embodiment of the present invention 3, air supply mode is to send next time on heteropleural.Every group is sent back to air port interval
3.76m, lateral extent bin-cube body bottom 1.21m under air outlet are evenly distributed on cube cabinet equipped with fan group side, return air inlet
Lower lateral extent bin-cube body bottom 0.24m is evenly distributed on cube cabinet equipped with observation panel side.At the top of drying device and bottom
The smaller trend that tapers off of portion's speed, in face return air inlet position, air velocity is lower, in vertical direction same position section
Velocity uniformity is relatively preferable；In the horizontal plane, air velocity is more serious along decaying far from air outlet direction, and air velocity is equal
Even property is general.It compared with sending mode next time on existing heteropleural, can be effectively improved in vertical direction, same position section air velocity
Unevenly, the problem excessive close to wind speed at air outlet, return air inlet, nonuniformity coefficient are to send air supply mode next time on existing heteropleural
1/4, pressure-drop coefficient is 8 times that air supply mode next time is sent on existing heteropleural, and heat loss rate is to send to blow next time on existing heteropleural
The 1/2 of mode.
When outdoor is in humid tropical condition, i.e. air dry-bulb temperature is greater than 33 DEG C, and less than 45 DEG C, air's wet bulb temperature is big
In 27 DEG C, when less than 29 DEG C, adjusting the first air-valve and horizontal direction angle is 0 °, the second air-valve and horizontal direction angle be 0 °~
7 °, third air-valve and horizontal direction angle are 0 °~15 °, and the 4th air-valve and horizontal direction angle are 15 °~30 °, the 5th air-valve
It is 25 °~30 ° with horizontal direction angle.When outdoor is in wet condition in low temperature, i.e. air dry-bulb temperature is greater than 18 DEG C, less than 23
DEG C, it when relative humidity is 70%~80%, adjusts the first air-valve and horizontal direction angle is 0 °, the second air-valve and horizontal direction are pressed from both sides
Angle is 30 °~45 °, and third air-valve and horizontal direction angle are 0 °~15 °, and the 4th air-valve and horizontal direction angle are 0 °~30 °,
5th air-valve and horizontal direction angle are 10 °~15 °.
In a kind of embodiment 4 of the invention, air supply mode is to serve back under heteropleural.In the middle part of the drying device in vertical direction
Air entirety wind speed is higher, and air velocity is lower in non-mainstream region, under the conditions of blowing herein, the air on same vertical cross-section
Flowing velocity inhomogeneities is stronger.Every group is sent back to interval 3.76m, and lateral extent bin-cube body bottom 0.24m under air outlet uniformly divides
Cloth is equipped with fan group side in cube cabinet, lateral extent bin-cube body bottom 1.21m under return air inlet, and serves back under existing heteropleural
Air supply mode is compared, which can be effectively improved air velocity in vertical direction and differ larger situation, heterogeneous system
Number is to serve back the 1/2 of air supply mode under existing heteropleural, and pressure-drop coefficient is 3 times that air supply mode is served back under existing heteropleural, heat
Loss late is 1/2 that air supply mode is served back under existing heteropleural.
When outdoor is in humid tropical condition, i.e. air dry-bulb temperature is greater than 33 DEG C, and less than 45 DEG C, air's wet bulb temperature is big
In 27 DEG C, when less than 29 DEG C, adjusts the first air-valve and horizontal direction angle is 0 °~5 °, the second air-valve is with horizontal direction angle
0 °~9 °, third air-valve and horizontal direction angle are 0 °~15 °, and the 4th air-valve and horizontal direction angle are 15 °~30 °, the 5th
Air-valve and horizontal direction angle are 30 °~35 °.When outdoor is in wet condition in low temperature, i.e. air dry-bulb temperature is small greater than 18 DEG C
In 23 DEG C, when relative humidity is 70%~80%, adjusts the first air-valve and horizontal direction angle be 0 °~15 °, the second air-valve with
Horizontal direction angle is 30 °~45 °, and third air-valve and horizontal direction angle are 0 °~15 °, the 4th air-valve and horizontal direction angle
It is 25 °~35 °, the 5th air-valve and horizontal direction angle are 5 °~10 °.
Claims (10)
1. a kind of crawler type heat pump grain dryer, which is characterized in that the drying device exists including cube cabinet (1), setting
Multilayer conveyer belt (24) in described cube of cabinet (1), the protective device (27) being arranged below every layer of conveyer belt (24), arrangement
Bamboo rake (26) right above every layer of conveyer belt (24), the feed inlet (2) being arranged at the top of a cube cabinet (1) one end, setting exist
The lower part discharge port (3) of cube cabinet (1) the same end, setting the place on the upper side of a cube cabinet (1) other end 1/2 moisture exhausting port (4),
With the heat pump assembly being connected to inside a cube cabinet (1), adjacent vertical side is provided with discharge port (3) on a cube cabinet (1)
Multiple fan groups (25) are provided with air outlet (6) between two adjacent fan groups (25), are provided on the side wall of cube cabinet (1)
Return air inlet (7).
2. crawler type heat pump grain dryer according to claim 1, which is characterized in that in described cube of cabinet (1)
Conveyer belt (24) of the portion equipped with four layers or four layers or more and for even level, as conveyer belt (24) number of plies N=4, the bin-cube
The functional relation of body (1) width M and high H are as follows: H=M；As conveyer belt (24) number of plies N > 4, described cube of cabinet (1) width M and high H
Functional relation are as follows: H=0.24*N*M, lowest level conveyer belt (24) length L3With the length L of a cube cabinet (1)1Functional relation
Are as follows: L3=0.98*L1；
Have k bamboo rake (26) right above lowest level conveyer belt (24), bamboo rake (26) spacing distance and conveyer belt (24) length L3's
Functional relation are as follows: d8=(0.11~0.12) * L3, the grain upstream end with conveyer belt (24) is at a distance of d9=(0.05~0.06) *
L3, remaining conveyer belt (24) length L2With the length L of a cube cabinet (1)1Functional relation are as follows: L2=0.95*L1, every at remaining
Have j bamboo rake (26) right above layer conveyer belt (24), and j > k, bamboo rake (26) spacing distance and conveyer belt (24) length L2Letter
Number relationship are as follows: d8=(0.11~0.12) * L2, with conveyer belt (24) grain upstream end at a distance of d9=(0.05~0.06) * L2；
The protective device (27) is concave surface pallet, does not have partition at direction of transfer both ends, protective device (27) is apart from conveyer belt
0.01 ± 0.005m of downside, protective device (27) width a1With conveyer belt (24) width a2Functional relation are as follows: a1=1.125*
a2- 0.025, protective device (27) height b1With conveyer belt (24) thickness b2Functional relation are as follows: b1=1.28*b2。
3. crawler type heat pump grain dryer according to claim 1, which is characterized in that include in the heat pump assembly
Inside air-supply passage (8), inside return air channel (9), outside air-supply passage (10), outside return air channel (11), heat pump, the heat
The inlet end of condenser (17) in pump is connected with inside air-supply passage (8), and the outlet side of condenser (17) and inside return air are logical
Road (9) connects, and the refrigerant inlet of the evaporator (16) in heat pump is connect with outside return air channel (11), the system of evaporator (16)
Cryogen outlet is connect with outside air-supply passage (10), also phase mutual connection between outside air-supply passage (10), outside return air channel (11)
Logical, inside air-supply passage (8) is connect with the air outlet (6) of a cube cabinet (1), and the first air-valve (23a) is housed at air outlet (6),
Condenser (17) is connect by inside return air channel (9) with return air inlet (7), and the second air-valve (23b) is housed at return air inlet (7),
Outside air-supply passage (10) is equipped with third air-valve (23c), and return air channel (11) is equipped with the 4th air-valve (23d) on the outside, outside
Lateral supply channel (10) and outside return air channel (11) junction are equipped with fresh wind port (14), and the 5th air-valve is housed at fresh wind port (14)
(23e), heat pump assembly number n3With a cube cabinet (1) length L1Functional relation are as follows: n3=[L1/ 5+0.5], fresh wind port (14)
Width a3With a cube cabinet (1) L1Functional relation are as follows: a3=0.14*L1/n3, fresh wind port (14) height b3With a cube cabinet (1)
The functional relation of height H are as follows: b3Filter screen is arranged at return air inlet (7) by=0.12*H, condenser (17) and evaporator (16) it
Before be not provided with filter screen；
First air-valve (23a) and the second air-valve (23b) and horizontal direction angle are at 0 °~15 °, control air-supply, return air speed
0.5m/s is fixed on hereinafter, air outlet (6) and return air inlet (7) are equal in magnitude, the wide a of air outlet (6) and return air inlet (7)4With it is vertical
Square box (1) long L1Functional relation be a4=0.0265*L1+ 0.01, the high b of air outlet (6) and return air inlet (7)4With bin-cube
The functional relation of body (1) high H is b4=0.308*H, air outlet (6) is equal with return air inlet (7) number, air outlet (6) number n1=
0.04*H*L1/(a4*b4)。
4. crawler type heat pump grain dryer according to claim 3, which is characterized in that the air outlet (6) with return
Air port (7) is arranged on the same side wall of a cube cabinet (1), and air outlet (6) is arranged between two adjacent return air inlets (7), air-supply
The interval of mouth (6) and adjacent two return air inlet (7) is d1=(L1-2n1*a4-2)/(2n1- 1), air outlet (6) and return air inlet (7)
Lower boundary distance cube cabinet (1) bottom d2=0.07*H+0.05.
5. crawler type heat pump grain dryer according to claim 3, which is characterized in that the air outlet (6) with return
Air port (7) is correspondingly arranged up and down in a cube cabinet (1) same side wall, and air outlet (6) and return air inlet (7) are between the upper and lower every d3=
0.1*H is divided into d between every group of air outlet (6) air outlet (6) adjacent with horizontal side4=(L1-n1*a4)/(n1+ 1), lowest level wind
Mouth lower boundary distance cube cabinet (1) bottom d5=0.1*H+0.03.
6. traditional Chinese medicinal material drying device according to claim 3, which is characterized in that the air outlet (6) is arranged in bin-cube
On one side wall of body (1), return air inlet (7) is arranged on the side wall of a cube cabinet (1) opposite direction, air outlet (6) and return air inlet (7)
It corresponds, and air outlet (6) setting position is lower than return air inlet (7) position, air outlet (6) lower boundary distance cube cabinet (1)
Bottom d5=0.1*H+0.03, return air inlet (7) lower boundary distance cube bottom of box d8=0.508*H+0.03, it is two neighboring to send
The spacing in air port (6), it is identical as the spacing of two neighboring return air inlet (7), it is d4=(L1-n1*a4)/(n1+1)。
7. traditional Chinese medicinal material drying device according to claim 3, which is characterized in that the air outlet (6) is arranged in bin-cube
On one side wall of body (1), return air inlet (7) is arranged on the side wall of a cube cabinet (1) opposite direction, air outlet (6) and return air inlet (7)
It corresponds, and return air inlet (7) setting position is lower than air outlet (6) position, return air inlet (7) lower boundary distance cube cabinet (1)
Bottom d5=0.1*H+0.03, air outlet (6) lower boundary distance cube bottom of box d8=0.508*H+0.03, it is two neighboring to send
It is identical at a distance from the distance in air port (6), with two neighboring return air inlet (7), it is d4=(L1-n1*a4)/(n1+1)。
8. crawler type heat pump grain dryer according to claim 1,2,3,4,5,6 or 7, which is characterized in that described
Moisture exhausting port (4) equidistantly distributed in the horizontal direction is equipped with the 6th air-valve (23f) at each moisture exhausting port (4).
9. crawler type heat pump grain dryer according to claim 1,2,3,4,5,6 or 7, which is characterized in that described
Moisture exhausting port (4) is square, and the functional relation of side length c and cube cabinet (1) width M are c=0.06*M, moisture exhausting port (4) number
n2=[0.0148*M*H/c2+ 0.5], moisture exhausting port (4) is spaced d6=(H-1.05-n2*c)/(n2- 1), at moisture exhausting port (4) lower boundary
To a cube cabinet (1) distance from bottom d7=0.82*H.
10. crawler type heat pump grain dryer according to claim 1,2,3,4,5,6 or 7, which is characterized in that described
Moisture exhausting port (4) is circle, diameter dvFunctional relation with a cube cabinet (1) width M is dv=0.0849*M, moisture exhausting port (4) number
n2=[0.0148*M*H/dv 2+ 0.5], moisture exhausting port (4) is spaced d6=(H-1.05-n2*dv)/(n2- 1), moisture exhausting port (4) lower boundary
Locate to a cube cabinet (1) distance from bottom d7=0.82*H.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910206660.8A CN109945625A (en) | 2019-03-18 | 2019-03-18 | Crawler type heat pump grain dryer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910206660.8A CN109945625A (en) | 2019-03-18 | 2019-03-18 | Crawler type heat pump grain dryer |
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| Publication Number | Publication Date |
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| CN109945625A true CN109945625A (en) | 2019-06-28 |
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| CN201910206660.8A Pending CN109945625A (en) | 2019-03-18 | 2019-03-18 | Crawler type heat pump grain dryer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115191243A (en) * | 2022-08-08 | 2022-10-18 | 中垦种业股份有限公司 | Wheat storage seed protection device, system and storage method |
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| CN115191243B (en) * | 2022-08-08 | 2023-05-16 | 中垦种业股份有限公司 | Wheat warehousing seed protection device, system and warehousing method |
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