CN115930591A - Refrigeration drying equipment - Google Patents

Abstract

The invention discloses a refrigeration drying device, which comprises a sealed box body and also comprises: the mounting plate is fixed on the inner wall of the sealed box body; the refrigeration assembly is arranged in an embedded groove formed in the mounting plate and comprises a cold end part and a hot end part; the cold air channel and the hot air channel are arranged in the mounting plate and communicated with the sealing box body, the cold end part is positioned in the cold air channel, and the hot end part is positioned in the hot air channel; and the switching component is used for communicating the cold air channel or the hot air channel with the inside of the sealed box body and internally circulating the air in the sealed box body. The invention not only achieves the dual purposes of refrigerating and drying in the sealed box body by switching the cold end part and the hot end part of the refrigerating component and the cold and hot air channels, but also does not need to additionally arrange two sets of equipment, thereby not only reducing the occupation on a certain degree of space, but also reducing the cost of refrigerating and drying.

Description

Refrigeration drying equipment

Technical Field

The invention relates to the technical field of refrigeration equipment, in particular to refrigeration drying equipment.

Background

The refrigeration function of the existing refrigeration equipment is mainly to make the air of the closed box body continuously circulate internally, make the air continuously flow through the cold end of the refrigeration module, and the cold end absorbs the heat in the air, so as to achieve the purpose of air refrigeration.

The drying device absorbs moisture in the air by means of the air passing through the moisture absorption module, such as a desiccant, so as to achieve the purpose of air drying.

Therefore, when refrigeration and drying are needed to be carried out in a closed box body, two kinds of equipment need to be arranged, the occupied space is increased, and the refrigeration and drying costs are increased.

Disclosure of Invention

The object of the present invention is to provide a freeze drying apparatus to solve at least one of the technical problems of the prior art described above.

In order to achieve the purpose, the invention provides the following technical scheme: the refrigeration drying equipment, including sealed box, still include:

the mounting plate is fixed on the inner wall of the sealed box body;

the refrigeration assembly is arranged in an embedded groove formed in the mounting plate and comprises a cold end part and a hot end part;

the cold air channel and the hot air channel are arranged in the mounting plate and communicated with the sealing box body, the cold end part is positioned in the cold air channel, and the hot end part is positioned in the hot air channel;

the switching component is used for communicating the cold air channel or the hot air channel with the inside of the sealed box body and internally circulating air in the sealed box body;

and the condensation component is arranged at the interval between the cold air duct and the hot air duct, and is used for cooling the cold air duct and condensing water vapor in the air in the hot air duct.

Preferably, the condensation subassembly is including setting up the inclined plane in hot-blast main and cold-blast duct space face department, and along the flow direction of air, the cross section of hot-blast main reduces gradually, the stock solution chamber that is used for storing liquid water is offered to the inside that the sealed box is located the lowest department on inclined plane, it is connected with the condensing plate to rotate on the inclined plane, just there is the gap between condensing plate and the inclined plane.

Preferably, the condensation assembly further comprises a detection assembly for detecting the content of water vapor in air flowing through the hot air duct, and when the detection assembly detects that the content of water vapor in air in the hot air duct is reduced to a preset value, the detection assembly controls the switching assembly to switch, so that the cold air duct is communicated with the inside of the sealed box body, and the hot air duct is isolated from the inside of the sealed box body.

Preferably, the detection assembly comprises a toggle ring which is rotatably arranged on the inner wall of the liquid storage cavity, the toggle ring comprises a plurality of straight plates which are distributed in an annular shape, a water receiving arc is fixed at the edge of each straight plate, and when condensed water on the condensing plate flows into the liquid storage cavity, the condensed water falls onto the hot end part and drives the toggle ring to rotate;

the detection assembly further comprises a sensor for detecting the rotation state of the dial ring, and when the sensor senses that the dial ring stops rotating, the sensor controls the switching assembly to switch.

Preferably, the detection assembly comprises an air humidity sensor installed on the inner wall of the hot air duct, the air humidity sensor is installed at a position, close to a position communicated with the sealed box body, of the hot air duct, and when the air humidity sensor detects that the content of water vapor in the air is reduced to a preset value, the air humidity sensor controls the switching assembly to switch.

Preferably, the switching assembly comprises an installation box arranged on the outer wall of the installation plate, a sliding frame is vertically and slidably installed on the inner wall of the installation box, a sliding plate is horizontally and slidably installed on the inner wall of the sliding frame, a swinging rod is rotatably installed between the sliding plate and the inner wall of the installation box, an air duct penetrates through the swinging rod, an outlet at one end of the air duct is communicated with the inside of the sealing box body, an outlet at the other end of the air duct is communicated with the inside of the sliding frame, a blowing assembly is installed on the outer wall of the sliding plate and used for pumping air in the sealing box body into the sliding frame, two communicating grooves are formed in the outer wall of the installation box and respectively communicated with the cold air duct and the hot air duct, and two communicating holes are formed in the outer wall of the sliding frame, which is close to the communicating groove surface;

the telescopic cylinder is used for driving the sliding frame to slide in the mounting box and is controlled by the detection assembly;

still include the baffle subassembly, work as during intercommunicating pore and cold wind channel intercommunication, the baffle subassembly will cool wind channel and the inside intercommunication of sealed box, just hot-blast main and the inside seal of sealed box, work as during intercommunicating pore and hot-blast main intercommunication, the baffle subassembly will hot-blast main and the inside intercommunication of sealed box, just the cold wind channel then with the inside seal of sealed box.

Preferably, the baffle subassembly is including seting up at the mounting panel near the inside perpendicular groove in top, and erects the groove and run through cold wind channel, hot-blast main and install bin, erect the vertical slidable mounting in inslot and have the lifter plate, two through-holes have been seted up to the outer wall of lifter plate, the top of lifter plate and the interior top of erecting the groove are connected with the spring, work as can push up the lifter plate when sliding on the sliding frame and shift up and make the through-hole with cold wind channel and the inside intercommunication of seal box.

Preferably, the switching assembly further comprises an external circulation assembly, the external circulation assembly comprises a ventilation curve arranged inside the installation box, the ventilation curve is communicated with the outside, the ventilation curve is communicated with the vertical groove, when the lifting plate moves upwards, the ventilation curve is communicated with the hot air channel through a through hole in the vertical groove, and when the lifting plate moves downwards, the ventilation curve is separated from the hot air channel through the lifting plate;

still including seting up the inlet air duct that is close to the inside below at the install bin, just inlet air duct's both ends export respectively with the install bin inside with external intercommunication, install the ventilation fan in the inlet air duct.

Preferably, the sensor adopts a speed measurement sensor for detecting the rotation state of the dial ring.

Preferably, the thickness of the space between the liquid storage cavity and the cold air channel is smaller than that of the space between the liquid storage cavity and the hot air channel.

Compared with the prior art, the invention has the following beneficial effects:

the invention not only achieves the dual purposes of refrigerating and drying in the sealed box body through the switching of the cold end part and the hot end part of the refrigerating component and the cold and hot air channels, but also does not need to be additionally provided with two sets of equipment, thereby not only reducing the occupation on a certain degree of space, but also reducing the refrigerating and drying cost, and by utilizing the mode of firstly drying and then refrigerating, the phenomenon of freezing and crushing after refrigerating caused by more water vapor in the sealed box body can be avoided, thereby not only ensuring the effective volume in the sealed box body, but also avoiding the freezing of the inner articles and the inner wall of the sealed box body, and facilitating the taking and the storage of the inner articles.

Drawings

FIG. 1 is a perspective view of a sealed housing of the present invention;

FIG. 2 is a side view of the sealed housing of the present invention;

FIG. 3 isbase:Sub>A cross-sectional view taken along A-A of FIG. 2 in accordance with the present invention;

FIG. 4 is an enlarged view of the invention at B in FIG. 3;

FIG. 5 is a cutaway perspective view of the perspective of FIG. 3 of the present invention;

fig. 6 is a partial sectional view of a second embodiment of the present invention.

In the figure: 1. sealing the box body; 2. mounting a plate; 3. installing a box; 4. a sliding frame; 5. a slide plate; 6. a swing rod; 7. an air duct; 8. a blowing assembly; 9. a cold air duct; 10. a hot air duct; 11. a communicating groove; 12. a communicating hole; 13. a refrigeration assembly; 14. a cold end; 15. a hot end; 16. a liquid storage cavity; 17. a condensing plate; 18. ventilating a bend; 19. an air inlet channel; 20. a lifting plate; 21. a through hole; 22. a spring; 23. a telescopic cylinder; 24. dialing the ring; 25. water receiving arc; 26. an air humidity sensor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment;

referring to fig. 1 to 5, the present invention provides a technical solution: the refrigeration drying equipment, including sealed box 1, still include:

the mounting plate 2 is fixed on the inner wall of the sealed box body 1;

the refrigeration assembly is arranged in an embedded groove formed in the mounting plate 2 and comprises a cold end part 14 and a hot end part 15;

the cold air duct 9 and the hot air duct 10 are arranged in the mounting plate 2 and communicated with the inside of the sealed box body 1, the cold end part 14 is positioned in the cold air duct 9, and the hot end part 15 is positioned in the hot air duct 10;

the switching component is used for communicating the cold air duct 9 or the hot air duct 10 with the interior of the sealed box body 1 and internally circulating air in the sealed box body 1;

and the condensation component is arranged at the interval between the cold air duct 9 and the hot air duct 10, and is cooled by utilizing the cold air duct 9, and is used for condensing water vapor in the air in the hot air duct 10.

When the refrigeration drying equipment is used, articles are stored by using the sealed box body 1, and then the interior of the refrigeration drying equipment is dried and refrigerated;

the hot air duct 10 is firstly communicated with the inside of the sealed box body 1 by utilizing the switching component, and the air is internally circulated in the hot air duct 10 and the sealed box body 1, namely when the air passes through the hot end part 15 in the hot air duct 10, the air flowing out of the sealed box body 1 is heated, and meanwhile, the temperature of water vapor in the air is also increased, meanwhile, the cold end part 14 of the refrigerating component refrigerates the air in the cold air duct 9, and then the condensing component is cooled under the action of heat conduction, and then when the heated air flows to the condensing component, the water vapor in the air is cooled and condensed on the condensing component to form liquid drops, so that the water vapor in the air is separated out, and meanwhile, the effect of cooling and cooling the hot air is also achieved, so that the overhigh temperature in the sealed box body 1 is avoided, and the effect of drying the air in the sealed box body 1 is achieved through the continuous internal circulation of the air;

it is worth mentioning that the temperature difference between the water vapor in the air and the condensing assembly can be improved by utilizing the mode of heating the air firstly, so that the condensing effect is further improved;

after drying, the cold air duct 9 is communicated with the inside of the sealed box body 1 by using the switching assembly, the hot air duct 10 is sealed with the sealed box body 1, and then the inside of the sealed box body 1 is further refrigerated and cooled by using the air internal circulation of the cold air duct 9 and the sealed box body 1 so as to achieve the purpose of refrigeration;

in conclusion, the cold end part 14 and the hot end part 15 of the refrigeration component and the switching of the cold air channel and the hot air channel not only achieve the dual purposes of refrigeration and drying in the sealed box body 1, but also do not need to be additionally provided with two sets of equipment, so that the occupation in a certain space can be reduced, and the refrigeration and drying costs can be reduced, and the phenomenon of ice and slag formation after refrigeration due to more water vapor in the sealed box body 1 can be avoided by utilizing the mode of firstly drying and then refrigerating, so that the effective volume in the sealed box body 1 can be ensured, meanwhile, the freezing of the inner articles and the inner wall of the sealed box body 1 can be avoided, and the taking and the storage of the inner articles are facilitated.

In one of the preferred embodiment, the condensation subassembly includes the inclined plane that sets up in hot-blast main 10 and cold-blast main 9 space face department, and along the flow direction of air, the cross section of hot-blast main 10 reduces gradually, and the sealed box 1 is located the inside of the lower department of inclined plane and offers the stock solution chamber 16 that is used for storing liquid water, rotates on the inclined plane and is connected with condensing panel 17, and has the gap between condensing panel 17 and the inclined plane.

Referring to fig. 3, when the air in the hot air duct 10 is heated and flows to the condensation plate 17, the water vapor therein condenses on the condensation plate 17 and forms water droplets, and the condensation plate 17 is set to be inclined so as to facilitate the condensed water droplets to slide into the liquid storage chamber 16 for collection, and to increase the contact range between the hot air and the condensation plate 17 for improving the condensation effect;

meanwhile, because a gap exists between the condensing plate 17 and the inclined plane, when air flows from the upper part to the lower part, the condensing plate 17 can continuously shake on the inclined plane due to the pressure difference between the upper part and the lower part of the condensing plate 17, so that the falling of condensed water drops on the condensing plate can be accelerated;

it is worth mentioning that the lower surface of the condensation plate 17 can be concave-convex, so that the air pressure can be changed continuously to ensure the continuous shaking of the condensation plate 17.

In one preferred embodiment, the condensing assembly further includes a detecting assembly for detecting the content of water vapor in the air flowing through the hot air duct 10, and when the detecting assembly detects that the content of water vapor in the air in the hot air duct 10 is reduced to a preset value, the detecting assembly controls the switching assembly to switch, so that the cold air duct 9 is communicated with the inside of the sealed box body 1, and the hot air duct 10 is isolated from the inside of the sealed box body 1.

In the process of water vapor condensation in the air, the water vapor content in the hot air duct 10 is detected by the detection assembly, so that the drying degree in the sealed box body 1 can be detected, and after the drying degree reaches a preset value, the detection assembly controls the switching assembly to switch, so that the cold air duct 9 is communicated with the sealed box body 1, namely, the drying program is switched to the refrigeration program.

In one preferred embodiment, the detection assembly comprises a toggle ring 24 rotatably mounted on the inner wall of the liquid storage cavity 16, the toggle ring 24 comprises a plurality of straight plates distributed in an annular shape, and a water receiving arc 25 is fixed at the edge of each straight plate, so that when condensed water on the condensing plate 17 flows into the liquid storage cavity 16, the condensed water falls onto the hot end part 15 and drives the toggle ring 24 to rotate;

the detection assembly further comprises a sensor for detecting the rotation state of the dial ring 24, and when the sensor senses that the dial ring 24 stops rotating, the sensor controls the switching assembly to switch.

3-4, as can be seen from the foregoing, condensed water droplets can flow into the liquid storage cavity 16 along the condensation plate 17 and fall into the water receiving arc 25, the dial ring 24 is driven to rotate under the action of gravity, and the sensor can detect the rotation state of the dial ring 24, when the sensor senses that the dial ring 24 stops rotating, no condensed water droplets fall, or the fallen water droplets are insufficient to drive the dial ring 24 to rotate, which indicates that the content of water vapor in the air has fallen to a preset value, and then the sensor controls the switching component to switch through an electric signal, so as to perform a refrigeration procedure;

it is worth mentioning that, as can be seen from the above, the shaking of the condensation plate 17 can accelerate the drop of the water drop, so that the rotation state of the dial ring 24 is more accurate, that is, the detection of the sensor is more accurate, and the accuracy degree during switching is further improved.

The second embodiment is basically the same as the first embodiment, except that a second implementation of the detecting assembly is provided, and particularly, refer to fig. 6;

in one preferred embodiment, the detecting component includes an air humidity sensor 26 installed on the inner wall of the hot air duct 10, and the air humidity sensor 26 is installed at a position of the hot air duct 10 near the communication position with the sealed box 1, and when the air humidity sensor 26 detects that the water vapor content in the air is reduced to a preset value, the air humidity sensor 26 controls the switching component to switch.

On the basis of the above, the moisture content in the circulated air is detected by the air humidity sensor 26 until the moisture content is reduced to a preset value, and then the air humidity sensor 26 controls the switching component to switch through an electric signal, so that the inside of the sealed box body 1 starts to be refrigerated, and the above effects can also be achieved.

In one preferred embodiment, the switching assembly comprises an installation box 3 arranged on the outer wall of the installation plate 2, a sliding frame 4 is vertically and slidably arranged on the inner wall of the installation box 3, a sliding plate 5 is horizontally and slidably arranged on the inner wall of the sliding frame 4, a swing rod 6 is rotatably arranged between the sliding plate 5 and the inner wall of the installation box 3, an air duct 7 is arranged in the swing rod 6 in a penetrating manner, an outlet at one end of the air duct 7 is communicated with the inside of the sealing box body 1, an outlet at the other end of the air duct 7 is communicated with the inside of the sliding frame 4, a blowing assembly 8 is arranged on the outer wall of the sliding plate 5 and used for pumping air in the sealing box body 1 into the sliding frame 4, two communication grooves 11 are formed in the outer wall of the installation box 3, the two communication grooves 11 are respectively communicated with a cold air duct 9 and a hot air duct 10 correspondingly, and two communication holes 12 are formed in the outer wall of the sliding frame 4, which is close to the communication grooves 11;

the telescopic device also comprises a telescopic cylinder 23 used for driving the sliding frame 4 to slide in the installation box 3, and the telescopic cylinder 23 is controlled by the detection component;

still include the baffle subassembly, when intercommunicating pore 12 and cold wind channel 9 communicate, the baffle subassembly with cold wind channel 9 and the inside intercommunication of sealed box 1, and hot-blast main 10 and the inside seal of sealed box 1, when intercommunicating pore 12 and hot-blast main 10 communicate, the baffle subassembly with hot-blast main 10 and the inside intercommunication of sealed box 1, and cold wind channel 9 then with the inside seal of sealed box 1.

Referring to fig. 3 for the switching assembly, fig. 3 is a state diagram of a state when the cold air duct 9 is communicated with the sealed box 1, that is, a state diagram of a refrigeration process;

in an initial state, namely a drying procedure, the sliding frame 4 is positioned at the lower half part of the installation box 3, the communication hole 12 is communicated with the hot air duct 10, the baffle plate assembly is used for communicating the hot air duct 10 with the inside of the sealed box body 1, the cold air duct 9 is sealed with the inside of the sealed box body 1, at the moment, under the action of the blowing assembly 8, air is sucked from the air duct 7, then enters the hot air duct 10 through the communication groove 11, and then flows back into the sealed box body 1, so that the internal circulation process is completed;

and when the detection subassembly was triggered, it drove the sliding frame 4 through control telescoping cylinder 23 and shifts up, made intercommunicating pore 12 and cold wind channel 9 intercommunication, and baffle subassembly communicates cold wind channel 9 and sealed box 1 is inside simultaneously, and hot-blast main 10 and sealed box 1 are inside sealed, and the state of figure 3 promptly, the air is inhaled from air duct 7, returns in the sealed box 1 behind the cold wind channel 9, begins the refrigeration procedure.

It should be noted that, in the process of up-and-down sliding of the sliding frame 4, the sliding plate 5 will drive the swing rod 6 to swing, and meanwhile, the sliding plate 5 will also horizontally slide in the sliding frame 4, and in the process of swinging of the swing rod 6, the air duct 7 inside the sliding frame always keeps the sealed box 1 and the sliding frame 4 in communication.

In a preferred embodiment, the baffle assembly includes a vertical slot formed in the mounting plate 2 near the upper portion, the vertical slot penetrates through the cold air duct 9, the hot air duct 10 and the mounting box 3, a lifting plate 20 is vertically and slidably mounted in the vertical slot, two through holes 21 are formed in the outer wall of the lifting plate 20, the top of the lifting plate 20 and the inner top of the vertical slot are connected with a spring 22, and when the sliding frame 4 slides upwards, the lifting plate 20 is pushed upwards to enable the through holes 21 to communicate the cold air duct 9 with the inside of the sealed box 1.

As can be seen from the above, during the drying process, the sliding frame 4 is located below the installation box 3, and at this time, under the elastic force of the spring 22, the lifting plate 20 moves down, so as to seal the cold air duct 9, and the through hole 21 above is communicated with the hot air duct 10;

then, during the refrigeration process, the sliding frame 4 moves upwards against the lifting plate 20 to move upwards, so as to seal the hot air duct 10, and the lower through hole 21 communicates the cold air duct 9 with the inside of the sealed box 1, so as to match different processes.

In one preferred embodiment, the switching assembly further comprises an external circulation assembly, the external circulation assembly comprises a ventilation curve 18 arranged inside the installation box 3, the ventilation curve 18 is communicated with the outside, the ventilation curve 18 is communicated with the vertical slot, when the lifting plate 20 moves upwards, the ventilation curve 18 is communicated with the hot air duct 10 through a through hole 21 in the vertical slot, and when the lifting plate 20 moves downwards, the ventilation curve 18 is isolated from the hot air duct 10 by the lifting plate 20;

still including seting up at the inside inlet air channel 19 of installing bin 3 below being close to, and the both ends export of inlet air channel 19 communicates with installing bin 3 is inside and external respectively, installs the ventilating fan in the inlet air channel 19.

In the refrigeration procedure, because the hot air duct 10 is isolated from the sealed box body 1, in order to dissipate heat generated at the hot end part 15, the hot air duct 10 needs to be communicated with the outside, and the heat is taken away by using an external circulation mode;

referring to fig. 3, during the drying process, the hot air duct 10 is communicated with the inside of the sealed box 1, at this time, the sliding frame 4 is located below to seal the air inlet channel 19, and the downward movement of the lifting plate 20 also separates the ventilation curved duct 18 from the hot air duct 10;

during the refrigeration process, the sliding frame 4 and the lifting plate 20 both move upwards, at this time, the through hole 21 in the vertical groove communicates the ventilation curved channel 18 with the hot air channel 10, the air inlet channel 19 is also opened, the outside air enters the hot air channel 10 under the action of the ventilation fan and is discharged from the ventilation curved channel 18, the generated heat is dissipated, and the influence on the refrigeration effect of the sealed box body 1 caused by heat accumulation is avoided.

And the heat is dissipated along with the air, and meanwhile, the condensed water in the liquid storage cavity 16 is evaporated and removed, so that special treatment is not needed.

In one preferred embodiment, the sensor is a speed sensor for detecting the rotation state of the dial ring 24.

In one preferred embodiment, the thickness of the space between the liquid storage cavity 16 and the cold air duct 9 is smaller than the thickness of the space between the liquid storage cavity 16 and the hot air duct 10.

Through the arrangement of the interval thickness, the temperature of condensed water drops can be kept in a lower state, so that the evaporation of the condensed water drops can be reduced, and the influence of the condensed water drops on the air drying degree is reduced.

The standard parts used in the present embodiment may be purchased directly from the market, and the non-standard structural components described in the specification and drawings may also be obtained by processing directly according to the common general knowledge of the prior art without any doubt, and the connection manner of the respective parts is a conventional manner well-established in the prior art, and the machines, parts and equipment are of a type conventional in the prior art, so that detailed description thereof is omitted.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. Refrigeration drying equipment, including sealed box (1), its characterized in that still includes:

the mounting plate (2), the said mounting plate (2) is fixed on the inboard wall of the sealed container body (1);

the refrigeration assembly is arranged in an embedded groove formed in the mounting plate (2) and comprises a cold end part (14) and a hot end part (15);

the cold air channel (9) and the hot air channel (10) are arranged in the mounting plate (2) and communicated with the inside of the sealed box body (1), the cold end part (14) is positioned in the cold air channel (9), and the hot end part (15) is positioned in the hot air channel (10);

the switching component is used for communicating the cold air duct (9) or the hot air duct (10) with the interior of the sealed box body (1) and internally circulating air in the sealed box body (1);

and the condensation component is arranged at the interval between the cold air duct (9) and the hot air duct (10), and is used for cooling the cold air duct (9) and condensing the water vapor in the air in the hot air duct (10).

2. A freeze dryer apparatus as claimed in claim 1, wherein: the condensation subassembly is including setting up the inclined plane in hot-blast main (10) and cold wind channel (9) space face department, and along the flow direction of air, the cross section of hot-blast main (10) reduces gradually, the stock solution chamber (16) that are used for storing liquid water are offered to the inside that sealed box (1) is located the lowest department on inclined plane, it is connected with condensing panel (17) to rotate on the inclined plane, just there is the gap between condensing panel (17) and the inclined plane.

3. A freeze drying apparatus according to claim 2, wherein: the condensation assembly further comprises a detection assembly used for detecting the content of water vapor in air flowing through the hot air duct (10), and when the detection assembly detects that the content of the water vapor in the air in the hot air duct (10) is reduced to a preset value, the detection assembly controls the switching assembly to switch, so that the cold air duct (9) is communicated with the inside of the sealed box body (1), and the hot air duct (10) is separated from the inside of the sealed box body (1).

4. A freeze drying apparatus according to claim 3, wherein: the detection assembly comprises a poking ring (24) rotatably mounted on the inner wall of the liquid storage cavity (16), the poking ring (24) comprises a plurality of straight plates which are distributed annularly, a water receiving arc (25) is fixed at the edge of each straight plate, and when condensed water on the condensing plate (17) flows into the liquid storage cavity (16), the condensed water falls onto the hot end part (15) and drives the poking ring (24) to rotate;

the detection assembly further comprises a sensor for detecting the rotation state of the poking ring (24), and when the sensor senses that the poking ring (24) stops rotating, the sensor controls the switching assembly to switch.

5. A freeze drying apparatus according to claim 3, wherein: the detection assembly comprises an air humidity sensor (26) arranged on the inner wall of the hot air duct (10), the air humidity sensor (26) is arranged at a position, close to a position communicated with the sealing box body (1), of the hot air duct (10), and when the air humidity sensor (26) detects that the content of water vapor in air is reduced to a preset value, the air humidity sensor (26) controls the switching assembly to switch.

6. The refrigeration drying apparatus according to claim 4 or 5, wherein: the switching assembly comprises an installation box (3) arranged on the outer wall of the installation plate (2), a sliding frame (4) is vertically and slidably installed on the inner wall of the installation box (3), a sliding plate (5) is horizontally and slidably installed on the inner wall of the sliding frame (4), a swinging rod (6) is rotatably installed between the sliding plate (5) and the inner wall of the installation box (3), an air duct (7) penetrates through the inside of the swinging rod (6), an outlet at one end of the air duct (7) is communicated with the inside of the sealing box body (1), an outlet at the other end of the air duct (7) is communicated with the inside of the sliding frame (4), an air blowing assembly (8) is installed on the outer wall of the sliding plate (5), the air blowing assembly (8) is used for sucking air in the sealing box body (1) into the sliding frame (4), two communicating grooves (11) are formed in the outer wall of the installation box (3), the two communicating grooves (11) are correspondingly communicated with a cold air duct (9) and a hot air duct (10) respectively, and two communicating holes (12) are formed in the outer wall, which is close to the surface of the sliding frame (4) to the communicating grooves (11);

the telescopic device is characterized by also comprising a telescopic cylinder (23) used for driving the sliding frame (4) to slide in the installation box (3), wherein the telescopic cylinder (23) is controlled by the detection assembly;

still include the baffle subassembly, work as during intercommunicating pore (12) and cold wind channel (9) intercommunication, the baffle subassembly will be cold wind channel (9) and sealed box (1) inside intercommunication, just hot-blast main (10) and sealed box (1) inside seal, work as during intercommunicating pore (12) and hot-blast main (10) intercommunication, the baffle subassembly will be hot-blast main (10) and sealed box (1) inside intercommunication, just cold wind channel (9) then and sealed box (1) inside seal.

7. The refrigeration drying apparatus of claim 6, wherein: baffle subassembly is close to the inside perpendicular groove of top including seting up at mounting panel (2), and erects the groove and run through cold wind channel (9), hot-blast main (10) and install bin (3), erect the vertical slidable mounting in inslot and have lifter plate (20), two through-holes (21) have been seted up to the outer wall of lifter plate (20), the top of lifter plate (20) is connected with spring (22) with the interior top of erecting the groove, works as can push up lifter plate (20) and shift up and make through-hole (21) with cold wind channel (9) and seal box (1) inside intercommunication when sliding frame (4) are gone up the time.

8. The refrigeration drying apparatus of claim 7, wherein: the switching assembly further comprises an external circulation assembly, the external circulation assembly comprises a ventilation curve (18) arranged inside the installation box (3), the ventilation curve (18) is communicated with the outside, the ventilation curve (18) is communicated with a vertical groove, when the lifting plate (20) moves upwards, a through hole (21) in the vertical groove communicates the ventilation curve (18) with the hot air channel (10), and when the lifting plate (20) moves downwards, the ventilation curve (18) is separated from the hot air channel (10) by the lifting plate (20);

still including offering in install bin (3) near inside inlet air channel (19) in below, just the both ends export of inlet air channel (19) communicates with install bin (3) inside and external world respectively, install the ventilation fan in inlet air channel (19).

9. The refrigeration drying apparatus of claim 4, wherein: the sensor adopts a speed measurement sensor and is used for detecting the rotation state of the poking ring (24).

10. A freeze dryer apparatus as claimed in claim 2, wherein: the spacing thickness between the liquid storage cavity (16) and the cold air channel (9) is smaller than that between the liquid storage cavity (16) and the hot air channel (10).

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