CN211372949U - Microwave heating type vacuum freeze dryer with multiple oscillation modes - Google Patents
Microwave heating type vacuum freeze dryer with multiple oscillation modes Download PDFInfo
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- CN211372949U CN211372949U CN201920937875.2U CN201920937875U CN211372949U CN 211372949 U CN211372949 U CN 211372949U CN 201920937875 U CN201920937875 U CN 201920937875U CN 211372949 U CN211372949 U CN 211372949U
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- drying
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Abstract
The utility model discloses a microwave heating type vacuum freeze dryer with multiple mode of oscillation, it includes shell, a plurality of microwave generator, microwave resonance control chamber, rotatory tray and polylith transmission flow partitioner. A plurality of microwave generators encircle and set up on the inner wall of shell, and adjacent at least two microwave generators are used for producing the microwave of different frequencies, and alternate and asymmetric placing. The microwave resonance control cavity is arranged on the inner side of the shell and is provided with an uneven inner surface, and the inner cavity of the shell is divided into a freeze-drying bin and an installation bin from inside to outside. The utility model discloses in, the tray that utilizes different frequency's microwave generator alternately and asymmetric places, places the material is rotatable, the design such as internal surface unevenness in microwave resonance control chamber, makes the microwave in the freeze-drying storehouse have multiple oscillation mode to reach microwave energy evenly distributed, in order to restrain "glow discharge".
Description
Technical Field
The utility model relates to a vacuum freeze dryer in freeze drying technical field especially relates to a microwave heating type vacuum freeze dryer with multiple oscillation mode.
Background
The vacuum freeze dryer is suitable for drying high-grade raw material medicines, traditional Chinese medicine decoction pieces, organisms, wild vegetables, dehydrated vegetables, foods, fruits, chemical engineering, medicine intermediates and other materials. The vacuum freeze drying is that the vacuum freeze drier combines the refrigerating system, the vacuum system, the heat conducting oil heating system and the dehumidifying system into a whole, and can greatly utilize the space for storing materials to carry out the vacuum freeze drying.
When the existing vacuum freeze dryer is used for drying materials, the heating period is long, the energy consumption is large, the operation cost is high, microwave heating is adopted as a heat source, the microwave is different from a heating mode of thermal radiation, the microwave freeze dryer is directly acted on the food materials to be dried, and the heating period can be greatly shortened. However, microwaves as a heat source have the following disadvantages: under vacuum conditions, microwaves produce a "glow discharge" that loses a portion of their energy, damaging equipment and damaging materials.
SUMMERY OF THE UTILITY MODEL
To the problem of prior art, the utility model provides a microwave heating type vacuum freeze dryer with multiple oscillation mode has solved current vacuum freeze dryer and has used the microwave as the heat source when, the microwave can produce "glow discharge", can lose the energy of some microwave, can damage the equipment simultaneously and destroy the problem of material.
The utility model discloses a following technical scheme realizes: a microwave heating type vacuum freeze dryer having a plurality of oscillation modes, comprising:
the shell (2) is a spherical or ellipsoidal stainless steel shell;
a plurality of microwave generators arranged around the inner wall of the housing; the adjacent at least two microwave generators are used for generating microwaves with different frequencies and are arranged alternately and asymmetrically, so that the generated microwaves are superposed to form an energy field with uniformly distributed microwave energy;
the microwave resonance control cavity is arranged in the shell, has an uneven inner surface and divides an inner cavity of the shell into a freeze-drying bin and an installation bin from inside to outside; the material is positioned in the freeze-drying bin, and the microwave generator is positioned in the mounting bin; and
the transmission flow isolating plates respectively correspond to the microwave generators and are arranged on the microwave resonance control cavity; each transmission flow isolating plate is attached to the output end of the corresponding microwave generator and is used for the microwaves generated by the corresponding microwave generator to pass through so as to enter the freeze-drying bin;
the microwave generated by the microwave generator is reflected on the inner surface and the outer surface of the microwave resonance control cavity for multiple times and forms various oscillation modes, so that the energy in the freeze-drying bin is uniformly distributed.
As a further improvement of the above aspect, the microwave heating type vacuum freeze dryer having a plurality of oscillation modes is used for drying a material, and further includes:
the controller is used for starting and stopping the microwave generator intermittently at the later stage of drying; after the vacuum freeze dryer dries the material for a preset time I, the controller starts the microwave generator once every other preset time II, and drives the microwave generator to stop generating microwaves after starting the microwave generator for a preset time III each time; and the third preset time is less than the second preset time.
Further, after the vacuum freeze dryer dries the material for the preset time, the controller drives the microwave generator to generate microwaves with the frequency of 915MHz-2450 MHz.
As a further improvement of the above aspect, the microwave heating type vacuum freeze dryer having a plurality of oscillation modes further includes:
a plurality of metal shielding overflux plates embedded in the microwave resonance control cavity; each metal shielding current-passing plate is provided with at least one through hole for communicating the freeze-drying bin with the mounting bin.
As a further improvement of the scheme, the freeze-drying bin is spherical or ellipsoidal.
As a further improvement of the scheme, the microwave resonance control cavity is provided with a plurality of air holes for communicating the freeze-drying bin with the mounting bin.
As a further improvement of the above scheme, one end of the shell is provided with an opening for the material to enter; the microwave heating type vacuum freeze-drying machine having the plurality of oscillation modes further includes:
a door mounted on the housing and covering the opening; wherein, a part of the microwave resonance control cavity is arranged on the side wall of the bin gate close to the freeze-drying bin and is detachably connected with the other part of the microwave resonance control cavity.
As a further improvement of the above scheme, the plurality of microwave generators include a first microwave generator, a second microwave generator and a third microwave generator, which are the same in number, and the frequencies of the microwaves generated by the first microwave generator, the second microwave generator and the third microwave generator are sequentially reduced; the first microwave generator, the second microwave generator and the third microwave generator are distributed on the inner wall of the shell in an interval mode.
As a further improvement of the scheme, the transmission flow isolating plate is made of wave-transparent material for transmitting microwaves.
As a further improvement of the above scheme, the vacuum freeze dryer further comprises a motor, wherein the motor is arranged at the top of the shell and drives the rotating tray to rotate through a rotating shaft; the rotating tray is made of teflon or ceramic.
The utility model discloses a microwave heating type vacuum freeze dryer with multiple oscillation mode, its microwave generator encircle to set up on the inner wall of shell, and the microwave generator of different frequencies is alternate and asymmetric simultaneously places for the microwave stack that produces makes energy evenly distributed in the shell, in order to restrain "glow discharge", improves the utilization ratio of microwave energy. The utility model discloses in, the microwave that microwave generator produced sees through and gets into freeze-drying storehouse again behind the transmission flow divider, can further restrain "glow discharge", and the unevenness's in microwave resonance control chamber surface can make the microwave take place multiple reflection and refraction to produce the oscillation as much as possible, make the energy evenly distributed in the freeze-drying storehouse, make full use of microwave energy, and reduce the influence of "glow discharge" to equipment and material. And, the utility model discloses an among the rotatory tray fill circulation conduction oil to form the conduction oil, the circulation conduction oil selects the medium that dielectric constant is less than 15, can absorb a small amount of microwave, neither too much extravagant energy consumption, can prevent again that the microwave from scurrying in disorder, makes energy distribution more even, avoids static material because produce the quality of focus and greatly influence dry material in dry later stage.
Drawings
Fig. 1 is a front view of a microwave heating type vacuum freeze dryer having various oscillation modes according to embodiment 1 of the present invention;
fig. 2 is a side view of the vacuum freeze dryer of fig. 1;
fig. 3 is a top view of a rotating tray of the vacuum freeze dryer of fig. 1;
FIG. 4 is a cross-sectional view of the rotating tray of FIG. 3;
FIG. 5 is a longitudinal sectional view of the rotating tray of FIG. 3;
fig. 6 is a front view of a microwave heating type vacuum freeze dryer having various oscillation modes according to embodiment 3 of the present invention;
FIG. 7 is an enlarged view of area A of FIG. 6;
fig. 8 is a front view of a microwave heating type vacuum freeze dryer having various oscillation modes according to embodiment 4 of the present invention.
Description of the symbols:
1 microwave resonance control cavity 7 transmission flow isolating plate
2 casing 8 metal shielding overfall plate
3 door 9 freeze-drying storehouse
4 motor 10 installation cabin
5 microwave generator 11 rotating shaft
6 rotating tray 12 air holes
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Example 1
Referring to fig. 1 and 2, the present embodiment provides a microwave heating type vacuum freeze dryer with multiple oscillation modes, which has a housing 2, a microwave generator 5, a microwave resonance control chamber 1, and a transmission cutoff plate 7, and may further include one or more structures of a rotating tray 6, a metal shielding cutoff plate 8, a rotating shaft 11, a motor 4, and a door 3.
The housing 2 may be spherical or ellipsoidal and may be made of a stainless steel material. The housing 2 may be laid on its side on the floor or other fabricated equipment while it may be subjected to a vacuum. The shell 2 can adopt the shell of the existing vacuum freeze dryer, and one end of the shell 2 is provided with a round opening, and the bin gate 3 is movably arranged on the shell 2 and covers the opening. The shell 2 can be also internally provided with a water catching system, a vacuum system, a refrigerating system and a control system, wherein the systems can adopt the existing systems and only have corresponding functions. Of course, in other embodiments, the housing 2 may be made of various materials, and may be provided with stainless steel material only on the inner wall thereof for support.
The number of the microwave generators 5 is plural, and the plural microwave generators 5 are circumferentially provided on the inner wall of the housing 2. Wherein, at least two adjacent microwave generators 5 are used for generating microwaves with different frequencies, and are arranged at intervals and in an asymmetric manner, so that the generated microwaves are superposed to form an energy field with uniformly distributed microwave energy. The microwave superposition device enables generated microwaves to be superposed, and enables microwave energy to be uniformly distributed in the shell 2, so that glow discharge is inhibited, the utilization rate of microwave energy is improved, meanwhile, materials can be prevented from being damaged due to nonuniform heating, and damage of equipment due to nonuniform heating is avoided.
In this embodiment, the plurality of microwave generators 5 may include a first microwave generator, a second microwave generator and a third microwave generator, which are the same in number, and the frequencies of the microwaves generated by the first microwave generator, the second microwave generator and the third microwave generator are sequentially decreased, that is, the first microwave generator, the second microwave generator and the third microwave generator are microwave generators 5 with different frequencies, i.e., high, medium and low frequencies. The first microwave generator, the second microwave generator and the third microwave generator are distributed on the inner wall of the shell 2 at intervals.
Referring to fig. 3, 4 and 5, the number of the rotating trays 6 may be one or more, and the rotating trays 6 are rotatably installed in the housing 2, in this embodiment, the rotating trays 6 are made of teflon or ceramic. Wherein, the rotary tray 6 is filled with circulating heat conducting oil for absorbing microwave, and the circulating heat conducting oil can adopt heat conducting oil with low microwave absorptivity, low melting point below-50 ℃ and no toxicity. Because the circulation conduction oil is filled in the rotary tray 6, the circulation conduction oil selects a medium with the dielectric constant less than 15 to form a heat conduction disc, a small amount of microwaves can be absorbed, the energy consumption is not wasted too much, the microwaves can be prevented from mixing randomly, the energy distribution is more uniform, and the static material is prevented from greatly influencing the quality of the dried material due to hot spots generated in the later drying stage. Meanwhile, the circulating heat conduction oil can ensure that the material cannot be rapidly heated in the later drying stage, the material can be prevented from being burnt, and the effect of balancing the material temperature is achieved.
Wherein, pivot 11 rotates and installs in shell 2, and motor 4 sets up at the top of shell 2, and output connection pivot 11 for motor 4 can drive rotatory tray 6 through pivot 11 and rotate. Rotatory tray 6 suit is on pivot 11 to rotation through pivot 11 is in order to rotate in shell 2, makes the material when dry, can rotate along with rotatory tray 6, in order to avoid static, thereby avoids influencing the emergence of the quality of dry material because the material produces the hot spot when static.
In the present embodiment, the rotating tray 6 has a fan shape, such as a quarter fan shape or other fan shape, and is disposed at equal intervals in the axial direction of the rotating shaft 11. And, the rotating tray 6 is made of teflon or ceramic. When the number of the rotating trays 6 is plural, of the adjacent two rotating trays 6, the radius of the rotating tray 6 close to the inner wall of the housing 2 is smaller than the radius of the rotating tray 6 far from the inner wall of the housing 2. In this way, the plurality of rotating trays 6 are combined to constitute a turntable, and the space inside the housing 2 can be maximally utilized, thereby maximizing the utilization rate.
The microwave resonance control chamber 1 is disposed in the housing 2 and has an uneven inner surface in order to increase the diversity of microwave oscillation modes and reduce the possibility of glow discharge. And the inner surface of the unevenness is regularly changed, and the inner cavity of the shell 2 is divided into a freeze-drying bin 9 and an installation bin 10 from inside to outside. The freeze-drying chamber 9 is ellipsoidal, and of course, in other embodiments, the freeze-drying chamber 9 may also be spherical. The rotary tray 6 is positioned in the freeze-drying chamber 9, and the microwave generator 5 is positioned in the installation chamber 10. The microwave resonance control cavity 1 can be composed of polytetrafluoroethylene and metal materials to form a resonant cavity, and the diversity of microwave reflection and refraction is formed by utilizing the distance inequality between the shell 2 and the microwave resonance control cavity 1, so that the diversity of microwave oscillation modes is further increased, the possibility of glow discharge is reduced, and multiple oscillation modes are arranged in the resonant cavity, so that the energy in the freeze-drying bin 9 is uniformly distributed, and a uniform energy field is formed. It should be noted here that the microwave resonant control cavity 1 does not serve as a support.
The number of the transmission flow isolating plates 7 is multiple, and the multiple transmission flow isolating plates 7 respectively correspond to the multiple microwave generators 5 and are arranged on the microwave resonance control cavity 1. Each transmission flow isolating plate 7 is attached to the output end of the corresponding microwave generator 5 and is used for the microwaves generated by the corresponding microwave generator 5 to pass through so as to enter the freeze-drying bin 9. The transmission flow isolating plate 7 can be made of a wave-transmitting material for microwave transmission, and the microwave generated by the microwave generator 5 enters the freeze-drying bin after passing through the transmission flow isolating plate 7, so that glow discharge can be further inhibited.
The microwave generated by the microwave generator 5 is reflected on the inner surface of the microwave resonance control cavity 1 for multiple times and forms multiple oscillation modes, so that oscillation as much as possible is generated, the energy in the freeze-drying bin 9 is uniformly distributed, the microwave energy is fully utilized, the influence of glow discharge on equipment and materials is reduced, the equipment is prevented from being damaged by the glow discharge, and the materials are prevented from being damaged due to uneven heating during drying.
The number of the metal shielding overflowing plates 8 is multiple, and the multiple metal shielding overflowing plates 8 are embedded in the microwave resonance control cavity 1. Each metal shielding overflowing plate 8 is provided with at least one through hole for communicating the freeze-drying bin 9 with the mounting bin 10. When carrying out the evacuation to shell 2, the through-hole can realize the intercommunication in freeze-drying storehouse 9 and installation storehouse 10, makes the inner wall of shell 2 bear the atmospheric pressure when the evacuation for microwave resonance control chamber 1 does not play the supporting role.
In summary, compared with the existing vacuum freeze-drying machine, the microwave heating type vacuum freeze-drying machine with multiple oscillation modes of the present embodiment has the following advantages:
in the vacuum freeze dryer of the embodiment, the microwave generators 5 are arranged on the inner wall of the shell 2 in a surrounding manner, and the microwave generators 5 with different frequencies are arranged alternately and asymmetrically, so that generated microwaves are superposed, energy is uniformly distributed in the shell 2, glow discharge is inhibited, and the utilization rate of the microwave energy is improved. In this embodiment, the microwave generated by the microwave generator 5 penetrates through the transmission flow partition plate 7 and then enters the freeze-drying chamber 9, so that the glow discharge can be further inhibited, and the uneven surface of the microwave resonance control cavity 1 can reflect and refract the microwave for multiple times, so that the oscillation as much as possible is generated, the energy in the freeze-drying chamber 9 is uniformly distributed, the microwave energy is fully utilized, and the influence of the glow discharge on equipment and materials is reduced. Moreover, the circulation conduction oil is filled in the rotary tray 6 of the embodiment to form a conduction tray, a certain amount of microwaves can be absorbed, the microwaves are prevented from mixing, the energy distribution is more uniform, and the static material is prevented from greatly influencing the quality of the dry material due to the hot spot generated in the later drying stage.
Example 2
The present embodiment provides a microwave heating type vacuum freeze dryer having a plurality of oscillation modes, which adds a controller on the basis of embodiment 1.
The controller is used for starting and stopping the microwave generator 5 intermittently at the later stage of drying. After the vacuum freeze dryer dries the material for a preset time I, the controller starts the microwave generator 5 once every other preset time II, and drives the microwave generator 5 to stop generating microwaves after starting the microwave generator 5 for a preset time III each time. And the third preset time is less than the second preset time. After the vacuum freeze dryer dries the material for a preset time, the controller drives the microwave generator 5 to generate low-frequency microwaves with the frequency of 915MHz-2450MHz so as to reduce the damage to the material. In other embodiments, the frequency of the low frequency microwaves is 890MHz to 2500 MHz.
Because the material scorches easily in the microwave heating later stage of the existing vacuum freeze dryer, the material can be damaged, and the material scorching needs to be prevented. In the embodiment, at the later stage of material drying, the microwave generator 5 is controlled by a controller, wherein the controller can adopt a microcomputer structure to realize intermittent heating. For example, after the microwave generator 5 heats for several minutes, the temperature of the material reaches a certain temperature, the controller stops the microwave generator 5 from emitting microwaves to stop heating, so that the material is prevented from being overheated, and simultaneously, after the temperature is reduced to a certain temperature, the heating is started again, so that the material is dried and heated in a proper temperature range all the time, and the occurrence of scorching can be avoided. Moreover, in the later stage of material drying, the frequency of the microwave generated by the microwave generator 5 is relatively low, so that the generation of hot spots can be prevented.
Example 3
Referring to fig. 6 and 7, the present embodiment provides a microwave heating type vacuum freeze dryer with multiple oscillation modes, which is similar to the vacuum freeze dryer of embodiment 1, except that the vacuum freeze dryer of the present embodiment eliminates a metal shielding flow passing plate 8 and forms a plurality of air holes 12 in a microwave resonance control chamber 1. The air holes 12 are formed in the bending part of the microwave resonance control cavity 1, reflection and refraction of microwaves are not affected, and the air holes 12 formed in the position can communicate the freeze-drying bin 9 with the mounting bin 10, so that the inner wall of the shell 2 bears atmospheric pressure generated by vacuumizing, the metal shielding overflowing plate 8 is omitted, and material cost can be reduced. Also, in other embodiments, the metal shielding overflowing plate 8 is also arranged on the bent part of the microwave resonance control cavity 1.
Example 4
Referring to fig. 8, the present embodiment provides a microwave heating type vacuum freeze dryer with multiple oscillation modes, which is similar to the vacuum freeze dryer of embodiment 1 except that the vacuum freeze dryer of the present embodiment has a housing 2 with the same height and diameter as the bottom surface, and the microwave resonance control chamber 1 has a spherical outer contour and is coaxially disposed in the housing 2. The diameter and the height of the bottom surface of the microwave resonance control cavity 1 are the same, and one part close to the bin gate 3 is fixed on the side wall of the bin gate 3 close to the freeze-drying bin 9 and is detachably mounted with the other part. The door 3 is rotatably mounted at the opening of the housing 2, but may be mounted in other ways. Therefore, the rotary tray 6 can maximally occupy the space of the freeze-drying bin 9, so that the space in the shell 2 is maximally utilized, and meanwhile, the microwave resonance control cavity 1 can enable microwave energy to be more fully uniformly distributed, so that the energy field of the freeze-drying bin 9 is homogenized by energy, and the heating and drying effects of materials are ensured.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A microwave heating type vacuum freeze dryer having a plurality of oscillation modes, for drying a material, comprising:
the shell (2), the said shell (2) is the stainless steel shell of the sphere or ellipsoid;
a plurality of microwave generators (5) which are arranged on the inner wall of the shell (2) in a surrounding way;
the microwave heating device is characterized in that at least two adjacent microwave generators (5) are used for generating microwaves with different frequencies, and are arranged alternately and asymmetrically, so that the generated microwaves are superposed to form an energy field with uniformly distributed microwave energy;
the microwave heating type vacuum freeze-drying machine having the plurality of oscillation modes further includes:
the microwave resonance control cavity (1) is arranged in the shell (2), has an uneven inner surface and divides an inner cavity of the shell (2) into a freeze-drying bin (9) and an installation bin (10) from inside to outside; the material is positioned in the freeze-drying bin (9), and the microwave generator (5) is positioned in the mounting bin (10); and
the transmission flow isolating plates (7) respectively correspond to the microwave generators (5) and are arranged on the microwave resonance control cavity (1); each transmission flow partition plate (7) is attached to the output end of the corresponding microwave generator (5) and is used for the microwave generated by the corresponding microwave generator (5) to pass through so as to enter the freeze-drying bin (9);
the microwave generated by the microwave generator (5) is reflected on the inner surface of the microwave resonance control cavity (1) for multiple times and forms multiple oscillation modes, so that the energy in the freeze-drying bin (9) is uniformly distributed.
2. The microwave-heated vacuum freeze dryer having multiple oscillation modes of claim 1, wherein the microwave-heated vacuum freeze dryer having multiple oscillation modes is used for drying a material, and further comprising:
the controller is used for starting and stopping the microwave generator (5) intermittently in the later drying period; after the vacuum freeze dryer dries the material for a preset time I, the controller starts the microwave generator (5) once every other preset time II, and drives the microwave generator (5) to stop generating microwaves after the microwave generator (5) is started for a preset time III each time; and the third preset time is less than the second preset time.
3. The microwave heating type vacuum freeze dryer having various oscillation modes as claimed in claim 2, wherein the controller drives the microwave generator (5) to generate the microwave having the frequency of 915MHz-2450MHz after the vacuum freeze dryer dries the material for the preset time period.
4. The microwave-heated vacuum freeze dryer having multiple oscillation modes of claim 1, further comprising:
a plurality of metal shielding overflux plates (8) which are embedded in the microwave resonance control cavity (1); each metal shielding overflowing plate (8) is provided with at least one through hole for communicating the freeze-drying bin (9) with the mounting bin (10).
5. The microwave heating type vacuum freeze dryer having various oscillation modes as claimed in claim 1, wherein the freeze drying compartment (9) is spherical or ellipsoidal.
6. The microwave heating type vacuum freeze dryer having various oscillation modes as claimed in claim 1, wherein the microwave resonance control chamber (1) is opened with a plurality of ventilation holes (12) communicating the freeze drying chamber (9) and the mounting chamber (10).
7. The microwave heating type vacuum freeze dryer having various oscillation modes as claimed in claim 1, wherein an opening for the entrance of the material is opened at one end of the housing (2); the microwave heating type vacuum freeze-drying machine having the plurality of oscillation modes further includes:
a door (3) mounted on the housing (2) and covering the opening; wherein, one part of the microwave resonance control cavity (1) is arranged on the side wall of the bin gate (3) close to the freeze-drying bin (9) and is detachably connected with the other part of the microwave resonance control cavity (1).
8. The microwave heating type vacuum freeze dryer having multiple oscillation modes according to claim 1, wherein the plurality of microwave generators (5) includes a first microwave generator, a second microwave generator and a third microwave generator, which are the same in number, and the frequencies of the microwaves generated by the first microwave generator, the second microwave generator and the third microwave generator are sequentially decreased; the first microwave generator, the second microwave generator and the third microwave generator are distributed on the inner wall of the shell (2) at intervals.
9. The vacuum freeze dryer of microwave heating type having multiple oscillation modes according to claim 1, wherein the transmission cutoff plate (7) is made of a wave-transparent material through which microwaves pass.
10. The vacuum freeze dryer of microwave heating type having multiple oscillation modes according to claim 1, further comprising a motor (4), the motor (4) being provided at the top of the housing (2) and rotating the rotary tray (6) through a rotation shaft (11); the rotating tray (6) is made of polytetrafluoroethylene or ceramic.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920937875.2U CN211372949U (en) | 2019-06-20 | 2019-06-20 | Microwave heating type vacuum freeze dryer with multiple oscillation modes |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920937875.2U CN211372949U (en) | 2019-06-20 | 2019-06-20 | Microwave heating type vacuum freeze dryer with multiple oscillation modes |
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| CN211372949U true CN211372949U (en) | 2020-08-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111578648A (en) * | 2019-02-19 | 2020-08-25 | 江苏食品药品职业技术学院 | Microwave heating type vacuum freeze dryer with multiple oscillation modes |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111578648A (en) * | 2019-02-19 | 2020-08-25 | 江苏食品药品职业技术学院 | Microwave heating type vacuum freeze dryer with multiple oscillation modes |
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