CN107202463A - The control method of rotary-type drier and refrigeration plant and refrigeration plant - Google Patents

Abstract

The invention provides a rotary dryer, refrigeration equipment and a control method for the refrigeration equipment. The rotary dryer includes: a rotatable cylinder body and a fixed first end cover and a second end cover. At least four separate chambers isolated from each other and extending through the cylinder are formed inside the cylinder. One of any two adjacent compartments is filled with moisture-absorbing material, and the other is filled with heat-insulating material. The first end cover has a dry air intake channel, and the second end cover has a dry air outlet channel; one of the first end cover and the second end cover also has a regeneration air intake channel, and the other also has a regeneration air outlet channel; In different working positions, the dry air inlet channel and the dry air outlet channel communicate with a separate chamber containing hygroscopic material, and the regenerated air inlet channel and regenerated air outlet channel communicate with another separate chamber containing hygroscopic material. The invention thermally isolates the separate chambers containing the hygroscopic material from each other, which is beneficial to improving the efficiency of moisture absorption and regeneration.

Description

Rotary dryer, refrigeration equipment and control method for refrigeration equipment

technical field

The invention relates to the technical field of air dehumidification, in particular to a rotary dryer, refrigeration equipment and a control method for the refrigeration equipment.

Background technique

During the use of refrigeration equipment such as refrigerators/freezers, when the compressor is turned on, the temperature inside the storage compartment decreases, and when the compressor is turned off, the temperature inside the storage compartment rises with the ambient temperature, so as the compressor starts When the machine is shut down, the internal temperature of the storage compartment fluctuates (generally, the temperature difference is 3-5°C). A change in the temperature inside the storage compartment will cause a change in the volume of the air inside the storage compartment, thereby forming a pressure difference with the air in the environment. And because the storage compartment of the refrigeration equipment is not a completely sealed structure, the air in the storage compartment will decrease in pressure as the temperature in the storage compartment decreases, so that the air in the external environment of the refrigeration equipment will pass through the door. Seals and the like leak into the storage room; and as the temperature in the storage room increases and the pressure increases, the air inside the storage room leaks out to the external environment of the refrigeration equipment through the door seal and the like. This phenomenon is called the "breathing" effect of the refrigeration equipment, and the "breathing" effect will produce such a phenomenon: as the compressor starts and stops, the air at the door seal will frequently leak into and out of the storage compartment.

Generally, the air humidity in the environment is relatively high. When the air in the environment leaks into the storage room, the temperature of the air in the storage room is lowered, and water condenses, resulting in condensation in the storage room. Frost. This is why the refrigeration equipment that has not been opened for a long time will also frost. Excessive frost will affect the sensory experience, and the frost layer will also affect the heat transfer performance of the refrigeration equipment, which will eventually lead to an increase in energy consumption of the refrigeration equipment, and Periodic manual defrosting is required.

Contents of the invention

It is an object of the first aspect of the present invention to provide a rotary dryer with better moisture absorption.

Another object of the first aspect of the present invention is to provide a refrigerator suitable for use in refrigeration equipment, so that when the refrigeration equipment is inhaled, the external ambient air is dried through it and then enters the storage compartment, thereby reducing the frosting of the storage compartment. quantity.

The purpose of the second aspect of the present invention is to provide a kind of refrigeration equipment with the rotary dryer, so that when the external ambient air enters the storage compartment through the rotary dryer when the refrigeration equipment is sucked, and flows Dried in a rotary dryer.

The object of the third aspect of the present invention is to provide a method for controlling a refrigeration device.

According to the first aspect of the present invention, a rotary dryer is provided, comprising: a cylinder body that can rotate around the central axis, and fixed first end caps and second end caps that are fixed at both ends of the cylinder body. end cap; of which

The interior of the cylinder forms at least four separate chambers that are isolated from each other and extend through the cylinder along the direction of the central axis, wherein one of any two adjacent separate chambers contains a hygroscopic material, the other contains insulation material;

The first end cover has a dry air inlet channel for receiving the air flow to be dried, and the second end cover has a dry air outlet channel for discharging the air flow to be dried; the first end cover and the second end cover one of them also has a regeneration inlet passage for receiving a regeneration gas flow, and the other has a regeneration outlet passage for discharging said regeneration gas flow; and

Wherein, when the cylinder body is in the working position of different rotation angles, the dry air inlet channel and the dry air outlet channel communicate with a separate chamber containing the hygroscopic material, and the regenerative air inlet channel The regenerated air outlet channel is in communication with another compartment containing the hygroscopic material.

Optionally, the dry air inlet channel and the regeneration air outlet channel are formed on the first end cover;

The dry outlet channel and the regenerative inlet channel are formed on the second end cap.

Optionally, the number of the separated chambers is four; and

The two separate chambers containing hygroscopic material are arranged opposite to each other;

The two separate chambers containing the heat insulating material are arranged opposite to each other.

Optionally, the section of each of the partitioned chambers is fan-shaped, and the two partitioned chambers arranged oppositely are center-symmetrical about the central axis.

Optionally, the cross-sectional area of the compartment containing the hygroscopic material is greater than the cross-sectional area of the compartment containing the heat insulating material.

Optionally, the cross-sectional area of the compartment containing the hygroscopic material is 3 to 6 times the cross-sectional area of the compartment containing the heat insulating material.

Optionally, the hygroscopic material is a fiber desiccant.

Optionally, the fiber desiccant is in a sheet shape, and multiple sheets of the fiber desiccant extend from the radially inner side to the radially outer side of the containing chamber where they are located.

Optionally, the rotary dryer also includes:

The driving structure is configured to drive the cylinder to rotate around the central axis, so that the cylinder can turn from a current working position to a next working position.

According to the second aspect of the present invention, there is provided a refrigeration device, comprising a storage compartment and a rotary dryer as described in any one of the preceding items,

Wherein the dry air outlet passage communicates with the storage compartment of the refrigeration equipment, and the dry air intake passage communicates with the external environment of the refrigeration equipment, so that when the temperature of the storage compartment drops and the air pressure decreases, the external Under the action of air pressure, ambient air enters the storage compartment through the dry inlet channel, the partition chamber containing the hygroscopic material, and the dry air outlet channel.

Optionally, the inlet of the regeneration air intake passage of the rotary dryer is arranged adjacent to the compressor of the refrigeration equipment;

The refrigerating equipment further includes: a fan, arranged at the inlet of the regeneration air intake passage, configured to introduce a regeneration airflow whose temperature around the compressor of the refrigeration equipment is higher than ambient air into the regeneration air intake passage, to regenerate the hygroscopic material in the compartment communicated with the regeneration inlet channel and the regeneration outlet channel.

According to a third aspect of the present invention, there is provided a method for controlling a refrigeration device, the refrigeration device being the aforementioned refrigeration device, wherein the control method includes:

Obtain the operating status of the compressor of the refrigeration equipment;

After the compressor is switched from the start state to the stop state, the cylinder of the rotary dryer is rotated by a preset angle so that it can be transferred from the current working position to the next working position;

Turn on the fan of the refrigeration equipment to introduce the regeneration air flow whose temperature around the compressor of the refrigeration equipment is higher than that of the ambient air into the regeneration air inlet channel of the rotary dryer, so that the regeneration air flow The moisture-absorbing material in the separated chamber in which the channel communicates with the regenerated air outlet channel is regenerated.

Optionally, the control method further includes: after the compressor switches from the stop state to the start state, shutting down the fan of the refrigeration equipment.

In the rotary dryer of the present invention, at least four separate chambers that are isolated from each other and extend through the cylinder along the direction of the central axis are arranged in the cylinder, wherein one of any two adjacent separate chambers contains Hygroscopic material, the other contains heat insulating material, so that at least two compartments of the rotary dryer contain hygroscopic material, and the compartments containing hygroscopic material are filled with partitions Separate chambers for thermal materials. When the hygroscopic material in one compartment of the rotary dryer absorbs moisture from the air stream to be dried, the hygroscopic material in one of the remaining compartments containing the hygroscopic material can simultaneously be regenerated by the regeneration air stream; and, because The hygroscopic material in the regeneration position and the hygroscopic material in the hygroscopic position are separated from other hygroscopic materials by using heat insulation materials, so as to improve the moisture absorption and regeneration efficiency of the rotary dryer, so as to avoid affecting the moisture absorption and regeneration efficiency due to heat conduction. That is to say, when regenerating the hygroscopic material at the regeneration position, it can avoid the high temperature regeneration gas from transferring heat to the hygroscopic material at other positions, thereby affecting the hygroscopic performance of other hygroscopic materials, and also affecting the regeneration position. The regeneration efficiency of the hygroscopic material.

Furthermore, four separate chambers are formed inside the cylinder body, which is beneficial to increase the capacity of the hygroscopic material to enhance the dehumidification effect. And the heat insulating material can be used to thermally isolate the hygroscopic material in the regeneration position and the hygroscopic material in the hygroscopic position from each other, so as to improve the moisture absorption and regeneration efficiency of the rotary dryer, so as to avoid the influence of heat conduction between the two separated chambers. Moisture absorption and regeneration efficiency. That is to say, it can avoid that when the hygroscopic material at the regeneration position is regenerated, the high temperature regeneration gas will transfer heat to the relatively low temperature hygroscopic material at the hygroscopic position, thereby affecting the hygroscopic performance of the hygroscopic material at the hygroscopic position , which also affects the regeneration efficiency of the hygroscopic material in the regeneration position.

Further, since the partition chamber extends through the partition chamber of the cylinder along the direction of the aforementioned central axis, the flow path between the dry air inlet channel and the dry air outlet channel, and between the regenerated air inlet channel and the regenerated air outlet channel is relatively smooth , so that the flow of the air to be dried and the air to be regenerated into the rotary dryer is relatively smooth. Therefore, when the temperature of the storage compartment of the refrigeration equipment of the present invention drops and the air pressure decreases (that is, the refrigeration equipment inhales air), the air from the external environment can flow into the storage compartment from the rotary dryer relatively smoothly, In order to reduce the air leakage from the door cracks, etc., so as to minimize the ambient air with high humidity entering the storage compartment, and reduce the amount of frosting. It can be seen that the rotary dryer of the present invention is particularly suitable for use in refrigeration equipment, so that when the refrigeration equipment is inhaled, the external ambient air is dried through it and then enters the storage compartment, thereby reducing the amount of frost in the storage compartment .

Further, in the rotary dryer of the present invention, the cross-sectional area of the partitioned chamber containing the moisture-absorbing material is set larger, especially set to be 3 times the cross-sectional area of the partitioned chamber containing the heat-insulating material. ~6 times, so that the partition chamber containing the hygroscopic material has sufficient hygroscopic space and hygroscopic material to dry the air to be dried better, so as to avoid insufficient drying of the air to be dried and affect the drying efficiency.

Further, the refrigeration equipment of the present invention is equipped with a rotary dryer so that when the temperature in the storage room of the refrigeration equipment drops and the air pressure decreases (that is, the refrigeration equipment inhales air), the external ambient air can pass through the rotary dryer under the action of air pressure. The partition chamber of the wheel dryer in the hygroscopic position enters the storage compartment; when the ambient air flows through the partition chamber of the rotary dryer, it is at least partially absorbed by the hygroscopic material in it, so that it enters the storage compartment. The humidity of the air in the compartment is relatively small, so as to prevent the ambient air with high humidity from entering the storage compartment and then condense into frost due to the temperature drop, thereby reducing the amount of frosting in the storage compartment or evaporator of the refrigeration equipment.

Furthermore, in the control method of the present invention, after the compressor is switched from the start state to the stop state, the cylinder of the rotary dryer is rotated by a preset angle so that it can be transferred from the current working position to the next working position , and turn on the fan of the refrigeration equipment to regenerate the moisture-absorbing material in the regeneration position, so that the moisture-absorbing material in the moisture-absorbing position and the moisture-absorbing material in the regeneration position of the rotary dryer can be regenerated with a start-stop cycle of the compressor Replacement ensures that the hygroscopic material in the hygroscopic position always has better hygroscopic capacity. Moreover, since the control method of the present invention starts to regenerate the hygroscopic material at the regenerating position after the compressor stops, the adverse effect of the regenerating airflow on the hygroscopic material at the hygroscopic position is further reduced.

Those skilled in the art will be more aware of the above and other objects, advantages and features of the present invention according to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of illustration and not limitation with reference to the accompanying drawings. The same reference numerals in the drawings designate the same or similar parts or parts. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the attached picture:

Figure 1 is a schematic exploded view of a rotary dryer according to one embodiment of the present invention;

Fig. 2 is a schematic view of the rotary dryer shown in Fig. 1 from another angle;

Figure 3 is a schematic view of the rotary dryer roughly along the direction of the central axis of the rotary dryer shown in Figure 1, in which the first end cover is omitted;

4 is a schematic schematic diagram of a refrigeration device according to an embodiment of the present invention;

Fig. 5 is a schematic flowchart of a method for controlling a refrigeration device according to an embodiment of the present invention.

detailed description

FIG. 1 is a schematic exploded view of a rotary dryer 100 according to an embodiment of the present invention; FIG. 2 is a schematic view of the rotary dryer 100 shown in FIG. 1 viewed from another angle. Referring to Figures 1 and 2, a rotary dryer 100 according to an embodiment of the present invention includes: a cylinder 10 that can rotate around a central axis A, and fixed first end caps 20 that cover both ends of the cylinder 10 and a second end cap 30 . Alternatively, it can also be understood that the rotary dryer 100 includes a fixed cylinder body 10 and a first end cover 20 and a second end cover 30 that cover both ends of the cylinder body 10 and can rotate around the central axis A.

Inside the cylinder body 10 are at least four separate chambers that are isolated from each other and extend through the cylinder body 10 along the direction of the central axis A. As shown in FIG. Wherein, one of any two adjacent compartments is filled with moisture-absorbing material, and the other is filled with heat-insulating material; it can be seen that this means that the number of compartments formed inside the cylinder body 10 is an even number .

In a preferred embodiment of the present invention, the number of compartments formed inside the barrel 10 is four. In some other embodiments, the number of compartments formed inside the barrel 10 may also be six, eight, ten, twelve and so on.

In order to facilitate the distinction, in the illustrated embodiment, the hygroscopic material 11 is contained in the compartment 14, and the heat insulating material (not shown in the figure) is contained in the compartment 13.

The hygroscopic material 11 is preferably a hygroscopic agent (or called a desiccant) capable of absorbing moisture in the air and desorbing the moisture by heating or the like. The hygroscopic material 11 can be silica gel, alumina, molecular sieve, etc., for example. The partition chamber 13 may be filled with expanded polystyrene board (EPS), foam material or other heat insulating materials.

The first end cover 20 has a drying inlet channel 21 for receiving the air to be dried; the second end cover 30 has a drying outlet channel 31 for discharging the air to be dried. When the cylinder 10 is in the working position of different rotation angles, the dry air inlet passage 21 and the dry air outlet passage 31 communicate with a separate chamber 14, so that the air to be dried entering the cylinder 10 through the dry air inlet passage 21 passes through the drying chamber. Flow out from the drying outlet channel 31. That is to say, when the cylinder body 10 turns to be in any working position, the dry air inlet passage 21 and the dry air outlet passage 31 are all communicated with a separate chamber 14, so that When the dry air flow passes through the corresponding partition chamber 14, part of the moisture is absorbed by the hygroscopic material 11 in the partition chamber 14 to become a dry air flow, thereby realizing the drying of the air flow to be dried.

In a further embodiment, one of the first end cover 20 and the second end cover 30 further has a regeneration inlet channel 32 for receiving the regeneration airflow, and the other further has a regeneration outlet channel 22 for discharging the regeneration airflow. In some embodiments, the regenerated air outlet channel 22 can be arranged on the first end cover 20 together with the dry air inlet channel 21 ; the regenerated air inlet channel 32 can be arranged on the second end cover 30 together with the dry air outlet channel 31 . In some embodiments, the regenerated air outlet channel 22 and the dry air intake channel 21 are disposed opposite to the regenerated air intake channel 32 and the dry air outlet channel 31 , respectively. In an alternative embodiment, the regenerated air outlet passage 22 can also be arranged on the second end cover 30 together with the dry air outlet passage 31; the regenerated air inlet passage 32 can also be arranged on the first end cover 20 together with the dry air inlet passage 21 .

When the dry air inlet passage 21 and the dry air outlet passage 31 communicate with a partition chamber 14 containing the hygroscopic material 11 (that is, the partition chamber 14 is in the hygroscopic position), the regenerative inlet passage 32 and the regeneration outlet passage 22 are connected with the other A separate chamber 14 containing hygroscopic material 11 communicates (ie the separate chamber 14 is in the regenerating position). That is, when the cylinder body 10 is in any working position, its dry air inlet passage 21 and dry air outlet passage 31 communicate with one partition chamber 14, and the regenerative inlet passage 32 and regeneration outlet passage 22 communicate with another partition chamber 14, Therefore, the rotary dryer 100 can perform moisture absorption and regeneration operations at the same time, or at least make the moisture absorption operation of the moisture absorption material in the moisture absorption position and the regeneration operation of the moisture absorption material in the regeneration position independent of each other. That is to say, when the cylinder body 10 is in any working position, the air to be dried can flow through one compartment 14 to be dried by the hygroscopic material 11 therein, and the regeneration air can flow through another compartment 14 to dry it. The hygroscopic material 11 is regenerated, so that the dehumidification performance of the rotary dryer 100 can be guaranteed for a long time.

In the rotary dryer 100 of the present invention, at least four separate chambers extending through the cylinder 10 along the direction of its central axis A, which are isolated from each other, are arranged in the cylinder 10, and any two adjacent separate chambers One of them contains a hygroscopic material, and the other contains a heat insulating material, so that the flow path between the dry air intake channel 31 and the dry air outlet channel 21 is gentle, and then the air flow to be dried entering the dry air intake channel 31 The flow is smoother. And when the hygroscopic material 11 in one partitioned chamber 14 of the rotary dryer 100 absorbs moisture, the hygroscopic material 11 in the other partitioned chamber 14 can be regenerated with regeneration gas. Since the present invention utilizes heat insulating materials to thermally isolate the hygroscopic material 11 in the regenerating position and the hygroscopic material 11 in the hygroscopic position from each other, and/or separate the hygroscopic material 11 in the regenerating position and the hygroscopic material 11 in the hygroscopic position from those in other positions The hygroscopic materials 11 are thermally isolated from each other, which is conducive to improving the moisture absorption and regeneration efficiency of the rotary dryer 100, so as to avoid affecting the moisture absorption and regeneration efficiency due to heat conduction between the two separate chambers 14. That is, when the hygroscopic material 11 at the regeneration position is regenerated, it is possible to prevent the high temperature regeneration gas from transferring heat to the relatively low-temperature hygroscopic material 11 at the hygroscopic position, thereby affecting the hygroscopic performance of the hygroscopic material 11 at the hygroscopic position, At the same time, it also affects the regeneration efficiency of the hygroscopic material 11 in the regeneration position.

In some embodiments, the first end cap 20 and the second end cap 30 may each include a respective circular cover plate and a peripheral wall extending from the periphery of the circular cover plate toward the barrel 10, the first end cap 20 and the second end cap The circular cover plate and the surrounding wall of the end cover 30 together with the barrel 10 define a relatively sealed space.

The structure of the rotary dryer 100 of the present invention will be described below by taking an embodiment in which four compartments are formed inside the cylinder body 10 as an example.

In the embodiment in which the number of partitioned chambers formed inside the cylinder 10 is four, the two partitioned chambers 14 containing the hygroscopic material 11 are arranged oppositely; the two partitioned chambers 13 containing the heat insulating material are oppositely arranged. set up. In some embodiments, the cross-section of each compartment is fan-shaped, and the two compartments opposite to each other are centrally symmetrical about the central axis A. In such an embodiment, the two opposite partition chambers 14 have the same shape and volume, and the two opposite partition chambers 13 have the same shape and volume. In this way, the current moisture absorption position can be exchanged with the current regeneration position by rotating the cylinder 10 by 180 degrees. That is, when the cylinder 10 rotates 180 degrees, the hygroscopic material 11 currently in the regeneration position turns to the hygroscopic position, and the hygroscopic material 11 currently in the hygroscopic position turns to the regeneration position. The cylinder 10 may be configured to rotate 180 degrees about the central axis A to exchange the current moisture absorption position and the current regeneration position.

In some embodiments, the rotary dryer 100 further includes a driving mechanism, such as a stepping motor 60 shown in FIG. The barrel 10 is turned from the current working position to the next working position. In the embodiment where the two compartments arranged oppositely are symmetrical about the central axis A, the driving mechanism can drive the cylinder body 10 to rotate 180 degrees around the central axis A, so that the cylinder body 10 can turn from the current working position to the next working position. Location. In some embodiments, the rotary dryer 100 can also include a rotating shaft 12 arranged along the central axis A of the cylinder 10, and the rotating shaft 12 can protrude from the first end cover 20 and/or the second end cover 30 to be compatible with The driving mechanism is connected in rotation, so that the cylinder body 10 is driven to rotate by the driving mechanism.

In a preferred embodiment, the cross-sectional area of the partition chamber 14 containing the hygroscopic material 11 is larger than the cross-sectional area of the partition chamber 13 containing the heat insulating material. That is, the central angle of the partitioned chamber 14 is larger than the central angle of the partitioned chamber 13 . In such an embodiment, the partition chamber 14 can be set larger, so that there are more hygroscopic materials 11 in the partition chamber 14, so that the air to be dried can fully contact with the hygroscopic material to be fully dried. In order to prevent the partition chamber 14 from being too small, it is difficult for the air to be dried to fully contact the hygroscopic material 11 when flowing through the partition chamber 14 , resulting in a poor drying effect.

Further, the cross-sectional area of the compartment 14 containing the hygroscopic material 11 is 3 to 6 times the cross-sectional area of the compartment 13 containing the heat insulating material. That is, the central angle of the partitioned chamber 14 is 3 to 6 times the central angle of the partitioned chamber 13 . In such an embodiment, when the air to be dried flows through the compartment 14 , it can fully contact the hygroscopic material 11 , so that the rotary dryer 100 has a better drying effect. In a further preferred embodiment, the cross-sectional area of the partition chamber 14 is five times that of the partition chamber 13 . That is, the central angle of the partitioned chamber 14 is five times the central angle of the partitioned chamber 13 . In such an embodiment, when the air to be dried flows through the compartment 14 , it can contact the hygroscopic material 11 more fully, so that the rotary dryer 100 has a better drying effect.

FIG. 3 is a schematic view of the rotary dryer 100 roughly along the central axis A direction of the rotary dryer 100 shown in FIG. 1 , in which the first end cover 20 is omitted. Referring to FIG. 3 , in some embodiments, a rotating shaft mounting seat 18 may be provided in the barrel 10 close to the center of the shaft, and the rotating shaft 12 passes through the center of the rotating shaft mounting seat 18 or is integrally formed with the rotating shaft mounting seat 18 . Four partitions 19 can be arranged between the rotating shaft mounting base 18 and the cylinder body 10 to form four separate chambers inside the cylinder body 10 that are isolated from each other and extend through the cylinder body 10 along the direction of the central axis A.

Continuing to refer to FIG. 2 , in some embodiments, a rotating shaft holding seat 38 is formed at the center of each circular cover plate of the first end cover 20 and the second end cover 30 , and the rotating shaft 12 is held on the rotating shaft holding seat 38 of the circular cover plate and can rotate relative to the rotating shaft holding seat 38. In some embodiments, four guide ribs 23 can be extended from the inner surface of the respective circular cover plates of the first end cap 20 and the second end cap 30 to the inside of the barrel 10 , and the first end cap 20 and the second end cap The four guide ribs 23, the peripheral wall and the shaft holding seat 38 of the cover 30 respectively define two pairs of opposite fan-shaped areas on the first end cover 20 and the second end cover 30, and the drying air inlet passage 21 and the regeneration air outlet passage 22 are respectively located in two opposite fan-shaped areas of the first end cover 20 . The dry air outlet channel 31 and the regenerative air intake channel 32 are respectively located in two opposite fan-shaped areas of the second end cover 30, and the dry air outlet channel 31 is aligned with the dry air intake channel 21, and the regenerated air outlet channel 22 is aligned with the regenerative air intake channel 32. alignment. That is, the projections of the drying outlet passage 31 and the drying inlet passage 21 on a plane perpendicular to the central axis A are at least partially coincident; the projections of the regeneration outlet passage 22 and the regeneration intake passage 32 on a plane perpendicular to the central axis A are at least partially coincident .

When the cylinder 10 is in any working position, the four guide ribs 23 of the first end cover 20 and the second end cover 30 are in contact with the four partitions 19 of the cylinder 10 to ensure The incoming airflow to be dried basically enters the compartment 14 at the hygroscopic position, and basically flows out through the drying outlet channel 31; at the same time, it is ensured that the regeneration airflow entering through the regenerative air intake channel 32 basically enters the compartment 14 at the regeneration position , and basically flow out through the regeneration outlet gas channel 22 .

The hygroscopic material 11 is preferably a fibrous desiccant. The fiber desiccant is sheet-shaped, and multiple sheets of fiber desiccant extend from the radially inner side to the radially outer side of the containing chamber 14 where they are located. The multiple pieces of fiber desiccant can be evenly distributed, that is, the multiple pieces of fiber desiccant divide the partition chamber 14 into multiple small fan-shaped areas with the same cross-sectional area and shape. The thickness of the fiber desiccant can be between 0.5mm and 2mm, for example, about 1mm. For the fiber desiccant, when the temperature difference between the regenerated airflow for regeneration and the airflow to be dried reaches 10°C or more, the fiber desiccant can be regenerated. That is, when the regeneration temperature of the fiber desiccant at the regeneration position is about 10°C higher than the moisture absorption temperature of the fiber desiccant at the moisture absorption position, the fiber desiccant can be regenerated. Therefore, the regeneration of the hygroscopic material can be realized under the condition that the temperature of the regeneration airflow is relatively low. The present invention utilizes the fiber desiccant’s characteristics of strong moisture absorption, large specific surface area, and regenerability at a certain wind speed and temperature difference (10°C), and through the rotation of the stepping motor 60, the two moisture absorption/regeneration areas are realized. Moisture absorption/regeneration is performed in turn, thereby realizing the function of removing moisture from the inhaled air.

A plurality of mounting slots extending along the direction of the central axis A are formed on the radially outer peripheral wall of the rotating shaft mounting seat 18 located in the partition chamber 14 , and correspondingly, in relation to the cylinder body 10 located in the partition chamber 14 A plurality of mounting slots extending along the direction of the central axis A are formed on the radially inner peripheral wall, and the radial ends of the multiple pieces of fiber desiccant are respectively snapped into the mounting slots of the rotating shaft mounting seat 18 and the cylinder 10 .

As mentioned above, since the flow path between the drying inlet passage 21 and the drying outlet passage 31 of the rotary dryer 100 of the embodiment of the present invention is relatively smooth, the flow of the air to be dried entering the drying inlet passage 21 relatively smooth. For the rotary dryer 100 with the structure shown in the figure, the test shows that along the flow direction of the airflow, the pressure difference between the drying inlet channel 21 and the drying outlet channel 31 of the rotary dryer 100 is less than 3Pa.

Further, the present invention also provides a refrigeration device, which has a storage compartment and a rotary dryer 100, so that the rotary dryer 100 is used to dehumidify the air entering the storage compartment. FIG. 4 is a schematic schematic diagram of a refrigeration device 200 according to one embodiment of the present invention. Referring to FIG. 4 , the refrigeration device 200 includes a heat insulation box 201 with an upper opening. The interior of the heat insulation box 201 forms a storage compartment 210 for storing food and the like. According to the storage temperature and usage, the interior of the heat insulation box 201 can be divided into at least one storage compartment 210 . In the illustrated embodiment, the interior of the heat insulation box 201 is divided into only one storage compartment 210 serving as a freezer. The cooling apparatus 200 may further include door bodies 220 for opening/closing the storage compartments 210, respectively.

The dry air outlet passage 31 communicates with the storage compartment 210 of the refrigeration equipment 200 through the pipeline 50, and the dry air intake passage 21 communicates with the external environment of the refrigeration equipment 200, so that when the temperature of the storage compartment 210 drops and the air pressure decreases, the external ambient air Under the action of air pressure, it enters into the storage compartment 210 through the dry air inlet channel 21 , a partition chamber 14 containing the hygroscopic material 11 and the dry air outlet channel 31 .

As is well known to those skilled in the art, the refrigerating device 200 may periodically inhale and exhale as its compressor (not shown in the figure) is turned on and off periodically. That is, when the compressor is turned on, the temperature in the storage compartment 210 decreases, and the air pressure in the storage compartment 210 decreases; air pressure increases.

Specifically, when the refrigeration equipment 200 is a freezer with a capacity of 300L, it is assumed that the temperature of its external environment is 25°C (298K), the relative humidity is 75%RH, and the atmospheric pressure is a standard atmospheric pressure (that is, 1.01325×10 ⁵ Pa ). When the temperature of the storage compartment 210 rises to -15°C (258.13K), the compressor starts, and when the temperature of the storage compartment 210 drops to -20°C (253.13K), the compressor stops.

Assume that the storage compartment 210 is completely sealed, and when the temperature of the storage compartment 210 is -15° C., the internal pressure thereof is a standard atmospheric pressure. According to the Boyle-Mariotte law: P1×T1=P2×T2, it can be obtained that P2=P1×T1÷T2, then ΔP=P2-P1=1.01325×10 ⁵ ×258.13÷253.13-1.01325×10 ⁵ = 2001Pa. Among them, P1 is equal to a standard atmospheric pressure; T1 is equal to -15°C; T2 is equal to -20°C. That is, when the temperature of the storage compartment 210 drops to -20° C., the internal air pressure increases by 2001 Pa. That is to say, when the storage compartment 210 is completely sealed, the maximum pressure difference between the inside and outside of the storage compartment 210 is 2001 Pa in one cooling cycle. But actually the storage compartment 210 is not completely sealed, and the external ambient air will slowly leak into the storage compartment 210 from the door seal under the action of the pressure difference inside and outside the storage compartment 210 . According to the actual measured data within 2 days (50 refrigeration cycles), the maximum pressure difference inside and outside the storage compartment 210 is 30Pa.

Assuming that the storage compartment 210 is not well sealed and the internal and external pressures are consistent, then according to the Gay-Lussac law: V1×T1=V2×T2, it can be concluded that V2=V1×T1÷T2, then ΔV=V2-V1= V1×T1÷T2-V1=(T1-T2)×V1÷T2=(258.13-253.13)×300÷253.13=5.9L. Where V1 is the volume of the storage compartment 210, which is equal to 300L; T1 is equal to -15°C; T2 is equal to -20°C. That is, in one cooling cycle, the storage compartment 210 will inhale 5.9 L of air, and at the same time remove 5.9 L of air in the temperature recovery cycle. This data is basically consistent with the actual measurement data, which shows that the sealing effect of the door seal is relatively poor. That is, in one cooling cycle, the storage compartment 210 sucks in approximately 2% of the total volume of air (ΔV÷V1=5.9÷300=2%).

Looking up the table, it is known that the absolute water content of air with a temperature of 25°C, a relative humidity of 75%RH, and a volume of 5.9L is 14.939g/kg; the temperature is -18°C, the relative humidity is 70%RH (the temperature is -18 ℃), the absolute water content of the air with a volume of 5.9L is 0.64g/kg; when the temperature is 25℃, the air density is 1.181kg/m ³ ; The density is 1.385kg/m ³ ; one cycle of respiration (that is, one refrigeration cycle + one temperature recovery cycle) can be regarded as 0.5 hours, and then the weight of water inhaled and condensed by the storage compartment 210 every day (24 hours) can be obtained for:

24÷0.5×5.9×10 ⁻³ ×(1.181×14.939-1.385×0.64)=4.75g.

That is, the weight of moisture leaking into the storage compartment 210 from the door seal every day is 4.75g.

It can be seen from the calculation and measurement that two conditions need to be met to achieve the dehumidification of the storage compartment 210. First, the resistance between the inlet of the drying inlet passage 21 of the rotary dryer 100 and the outlet of the drying outlet passage 31 It should be far less than 30Pa, so that when the storage compartment 210 is inhaling, more external ambient air can flow into the storage compartment 210 through the rotary dryer 100 (that is, the external ambient air basically does not leak in from the door seal. storage compartment 210), play the role of moisture absorption. Second, the rotary dryer 100 needs to meet at least the ability to absorb 1.9g of water in 24 hours, that is, the rotary dryer 100 can absorb at least 40% of the total influent water (that is, 4.75g×40%). Good moisture absorption.

As mentioned above, the pressure difference between the drying inlet channel 21 and the drying outlet channel 31 of the rotary dryer 100 is less than 3Pa, which is much smaller than the 30Pa required for door seal leakage. It can be considered that the storage compartment 210 of the refrigeration equipment The inhaled gas basically enters the interior of the storage compartment 210 from the rotary dryer 100 . That is, during the start-up of the compressor, the ambient air outside the refrigeration equipment 200 (i.e., the air flow to be dried) basically enters into the storage tank through the dry air inlet passage 21 of the rotary dryer 100, the hygroscopic material 11 at the hygroscopic position, and the dry air outlet passage 31. In the object room 210.

In addition, tests have shown that after the air with a temperature of 25° C. and a relative humidity of 75% RH flows through the rotary dryer 100 during drying, the relative humidity at the outlet of the drying air outlet channel 31 can be reduced to 40% RH (corresponding to absolute The water content is 7.879g/kg), assuming that in each refrigeration cycle, the moisture absorption capacity of the hygroscopic material at the moisture absorption position of the rotary dryer 100 is basically the same, it can be concluded that the rotary dryer is The weight of water absorbed by 100 is:

24÷0.5×5.9×10 ⁻³ ×1.181×(14.939-7.879)=2.355g.

That is, using the rotary dryer 100 can reduce 49.6% (ie 2.355÷4.75×100%) of the total water inhaled by the storage compartment 210 during the cooling cycle every day.

It can be seen that the rotary dryer 100 of the embodiment of the present invention is particularly suitable for use in refrigeration equipment, so that when the temperature of the storage compartment 210 of the refrigeration equipment drops and the air pressure decreases, the air in the external environment can be dried from the rotary dryer. The device 100 flows into the storage compartment 210 relatively smoothly, so as to minimize the air leakage from the door cracks and the like, so that the ambient air with high humidity enters the storage compartment 210 as little as possible. Since the incoming air passes through the hygroscopic material 11 for moisture absorption and drying, frost will not form in the storage compartment 210 due to cooling. Therefore, the present invention can effectively reduce the amount of frost in the storage compartment 210 .

When the evaporator is directly arranged in the storage compartment 210 or communicated with the storage compartment 210 through an air duct, frosting on the surface of the evaporator can also be effectively reduced. After the compressor stops, the temperature in the storage compartment 210 rises slowly, the air pressure in the storage compartment 210 increases, and the air inside the storage compartment 210 can pass through the drying outlet channel 31 of the rotary dryer 100 , the hygroscopic material 11 in the hygroscopic position, and the dry air intake channel 21 enter the external environment.

In some embodiments, the cooling device 200 may further include a blower 40, which is arranged at the inlet of the regeneration air intake passage 32 and is configured to introduce the regeneration airflow into the regeneration intake passage 32, so as to interact with the regeneration intake passage 32 and the regeneration air flow. The hygroscopic material 11 in the compartment 14 connected with the outlet channel 22 is regenerated. In an alternative embodiment, the blower 40 is a suction blower, which may be disposed at the outlet of the regeneration air passage 22 .

In some embodiments, the inlet of the regeneration air inlet channel 32 of the rotary dryer 100 is disposed adjacent to the compressor of the refrigeration equipment 200; ) is introduced into the regeneration inlet channel 32 to regenerate the hygroscopic material 11 in the compartment 14 communicating with the regeneration inlet channel 32 and the regeneration outlet channel 22 . Those skilled in the art can understand that "adjacent" here means that the air entering the regenerative intake passage 32 through the inlet of the regenerative intake passage 32 can be heated by the heat dissipated when the compressor is turned on.

In some other embodiments, the inlet of the regenerative air inlet channel 32 of the rotary dryer 100 is set adjacent to the condenser (not shown in the figure) of the refrigeration equipment 200; the fan 40 is configured to make the temperature around the condenser higher than the environment The regeneration air flow of air is introduced into the regeneration inlet channel 32 to regenerate the hygroscopic material 11 in the compartment 14 communicating with the regeneration inlet channel 32 and the regeneration outlet channel 22 .

In these embodiments, the refrigerating device 200 can heat and regenerate the hygroscopic material 11 by relying on its own waste heat from the compressor or the condenser, without additional heat sources such as heating wires.

In some other embodiments, if the heat of the compressor is not enough, an electric heating device can be added at the fan 40 to supplement the heat.

In an alternative embodiment, an electric heating device (not shown in the figure) may be provided separately to heat the air entering the regeneration air intake channel 32 through the inlet of the regeneration air intake channel 32 to regenerate the hygroscopic material 11 .

Next, referring to FIG. 4 again, an optional working process of the refrigeration device 200 with the above structure will be described.

Turn on the compressor, during the start-up period of the compressor, the refrigeration equipment 200 sucks air, and the external ambient air enters the storage compartment 210 through the partition chamber 14 of the rotary dryer 100 that communicates with the drying inlet passage 21 and the drying outlet passage 31 , and use the hygroscopic material 11 in the compartment 14 to dry the air leaking into the storage compartment 210 . When the compressor is shut down, the stepper motor 60 on the rotary dryer 100 is started, which drives the cylinder 10 of the rotary dryer 100 to rotate 180° (at this time, the regenerated hygroscopic material turns to the moisture absorption position, after moisture absorption The hygroscopic material is transferred to the regeneration position), and simultaneously (or slightly earlier or later) the fan 40 starts (the heat of the vast majority is provided by the temperature of the compressor, and an electric heating device can be added at the fan 40 if necessary), through a high temperature The regenerating airflow at about 10° C. or above ambient air regenerates the hygroscopic material 11 in the compartment 14 communicating with the regenerating inlet passage 32 and the regenerating outlet passage 22 . The air in the storage compartment flows into the external environment through the partition chamber 14 of the rotary dryer 100 communicating with the drying inlet channel 21 and the drying outlet channel 31 . When the compressor is turned on again, the refrigeration equipment 200 sucks air again, and the external ambient air enters the storage compartment 210 through the partition chamber 14 of the rotary dryer 100 communicated with the drying inlet passage 21 and the drying outlet passage 31, and at the same time (or slightly earlier or later) the blower 40 stops running, so as to stop regenerating the hygroscopic material 11 at the regenerating position. In such a cycle, the purpose of continuous dehumidification is achieved by using the rotary cycle regeneration of the rotary dryer 100 .

Those skilled in the art should understand that the refrigerating device 200 involved in the present invention may be a device with refrigerating and/or freezing functions, such as a refrigerator, a freezer, a wine cabinet, a refrigerated tank, and the like. The refrigeration device 200 is preferably a freezer. The freezer is usually used for commercial purposes, and the volume of the storage compartment 210 is generally large, and the freezer is usually refrigerated by direct cooling, so the inside of the freezer is more frequently frosted. The present invention reduces the amount of frost inside the freezer by using the rotary dryer 100 to dry the air that enters into the freezer during its suction process.

The embodiment of the present invention also provides a control method of the refrigeration equipment 200, which is used for controlling the rotation of the rotary dryer 100 of the refrigeration equipment 200. Fig. 5 is a schematic flowchart of a control method of the refrigeration device 200 according to an embodiment of the present invention. As shown in Fig. 5, the control method includes steps S502 to S506.

Step S502, acquiring the running state of the compressor of the refrigeration equipment 200.

Step S504, judging whether the compressor is switched from the start state to the stop state, if the compressor is switched from the start state to the stop state, execute step S506, otherwise return to step S502.

Step S506, make the cylinder 10 of the rotary dryer 100 rotate a preset angle so that it can be transferred from the current working position to the next working position; turn on the fan 40 to make the temperature around the compressor higher than that of the ambient air The regeneration airflow is introduced into the regeneration inlet channel 32 of the rotary dryer 100 to regenerate the hygroscopic material 11 in the compartment 14 communicating with the regeneration inlet channel 32 and the regeneration outlet channel 22 .

In step S502, the operating state of the compressor may be obtained by using a current sensor or a voltage sensor.

In step S504, it may be determined whether the compressor is switched from the start state to the stop state according to the current or voltage detected by the current sensor or the voltage sensor. For example, when the current sensor just detects that the compressor has current, it is considered that the compressor is switched from the stop state to the start state.

In the embodiment in which four compartments are formed inside the barrel 10 , the preset angle mentioned in step S506 may be, for example, 180 degrees. In step S506, the sequence of rotating the cylinder 10 and turning on the blower 40 is not particularly limited. In a preferred embodiment, the cylinder body 10 can be rotated by a predetermined angle first so that it can be transferred from the current working position to the next working position; and then the fan 40 can be turned on. After performing step S506, return to step S502.

In the control method of the present invention, after the compressor is switched from the start state to the stop state, the cylinder body 10 of the rotary dryer 100 is rotated by a preset angle so that it can be transferred from the current working position to the next working position, And turn on the blower 40 to regenerate the hygroscopic material 11 in the regeneration position, so that the hygroscopic material 11 in the hygroscopic position and the hygroscopic material in the regeneration position of the rotary dryer 100 can be regenerated with one start-stop cycle of the compressor. 11 is replaced to ensure that the hygroscopic material 11 in the hygroscopic position always has better hygroscopic capacity, so that the rotary dryer 100 can be used to reduce 49.6% of the total water intake of the storage compartment 210 in the refrigeration cycle every day. Moreover, since the control method of the present invention starts to regenerate the hygroscopic material 11 at the regenerating position after the compressor stops, the adverse effect of the regenerating airflow on the hygroscopic material 11 at the hygroscopic position is further reduced.

Continuing to refer to FIG. 5 , in some embodiments, in step S504, if the compressor is not switched from the start state to the stop state, then step S508 may continue to be executed.

Step S508 , judging whether the compressor is switched from the stop state to the start state, if the compressor is switched from the stop state to the start state, execute step S510 , otherwise return to step S502 .

Step S510, after the compressor switches from the off state to the on state, turn off the fan 40 of the refrigeration device 200 .

In step S508, it may be determined whether the compressor is switched from the stop state to the start state according to the current or voltage detected by the current sensor or the voltage sensor. For example, when the current sensor just detects that the compressor has no current, it is considered that the compressor is switched from the start state to the stop state.

After step S510 is executed, step S502 may be returned.

Those skilled in the art can understand that the execution order of steps S504 and S508 can be interchanged, that is, after step S502, step S508 can be executed first to determine whether the compressor is switched from the shutdown state to the start state; if the compressor is switched from the shutdown state to In the power-on state, execute step S510, otherwise execute step S504. After step S510 is executed, return to step S502. After step S504 is executed, it is determined whether the compressor is switched from the on state to the off state, if the compressor is switched from the on state to the off state, then execute step S506 and then return to step S502, otherwise directly return to step S502. Of course, steps S504 and S508 may also be executed simultaneously.

So far, those skilled in the art should appreciate that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, the disclosed embodiments of the present invention can still be used. Many other variations or modifications consistent with the principles of the invention are directly identified or derived from the content. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (13)

1. A rotary dryer, comprising: a cylinder rotatable around a central axis, and fixed first end caps and second end caps at both ends of the cylinder; wherein The interior of the cylinder forms at least four separate chambers that are isolated from each other and extend through the cylinder along the direction of the central axis, wherein one of any two adjacent separate chambers contains a hygroscopic material, the other contains insulation material; The first end cover has a dry air inlet channel for receiving the air flow to be dried, and the second end cover has a dry air outlet channel for discharging the air flow to be dried; the first end cover and the second end cover one of them also has a regeneration inlet passage for receiving a regeneration gas flow, and the other has a regeneration outlet passage for discharging said regeneration gas flow; and Wherein, when the cylinder body is in the working position of different rotation angles, the dry air inlet channel and the dry air outlet channel communicate with a separate chamber containing the hygroscopic material, and the regenerative air inlet channel The regenerated air outlet channel is in communication with another compartment containing the hygroscopic material. 2. The rotary dryer of claim 1, wherein The dry air inlet channel and the regenerated air outlet channel are formed on the first end cap; The dry outlet channel and the regenerative inlet channel are formed on the second end cap. 3. The rotary dryer of claim 1, wherein the number of said separate chambers is four; and The two separate chambers containing hygroscopic material are arranged opposite to each other; The two separate chambers containing the heat insulating material are arranged opposite to each other. 4. The rotary dryer of claim 3, wherein The cross-section of each of the partition chambers is fan-shaped, and the two opposite partition chambers are centrally symmetrical about the central axis. 5. The rotary dryer of claim 4, wherein The sectional area of the compartment containing the hygroscopic material is greater than the sectional area of the compartment containing the heat insulating material. 6. A rotary dryer according to claim 5, wherein The cross-sectional area of the compartment containing the hygroscopic material is 3 to 6 times the cross-sectional area of the compartment containing the heat insulating material. 7. The rotary dryer of claim 1, wherein The hygroscopic material is a fiber desiccant. 8. The rotary dryer of claim 7, wherein The fiber desiccant is sheet-shaped, and multiple sheets of the fiber desiccant extend from the radially inner side to the radially outer side of the containing chamber where they are located. 9. The rotary dryer of claim 4, further comprising: The driving structure is configured to drive the cylinder to rotate around the central axis, so that the cylinder can turn from a current working position to a next working position. 10. A refrigeration device, comprising a storage compartment and the rotary dryer according to any one of claims 1-9, Wherein the dry air outlet passage communicates with the storage compartment of the refrigeration equipment, and the dry air intake passage communicates with the external environment of the refrigeration equipment, so that when the temperature of the storage compartment drops and the air pressure decreases, the external Under the action of air pressure, ambient air enters the storage compartment through the dry inlet channel, the partition chamber containing the hygroscopic material, and the dry air outlet channel. 11. The refrigeration device of claim 10, wherein The inlet of the regenerative air intake channel of the rotary dryer is arranged adjacent to the compressor of the refrigeration equipment; The refrigerating equipment further includes: a fan, arranged at the inlet of the regeneration air intake passage, configured to introduce a regeneration airflow whose temperature around the compressor of the refrigeration equipment is higher than ambient air into the regeneration air intake passage, to regenerate the hygroscopic material in the compartment communicated with the regeneration inlet channel and the regeneration outlet channel. 12. A method for controlling a refrigeration device, the refrigeration device being the refrigeration device according to claim 11, wherein the control method comprises: Obtain the operating status of the compressor of the refrigeration equipment; After the compressor is switched from the start state to the stop state, the cylinder of the rotary dryer is rotated by a preset angle so that it can be transferred from the current working position to the next working position; Turn on the fan of the refrigeration equipment to introduce the regeneration air flow whose temperature around the compressor of the refrigeration equipment is higher than that of the ambient air into the regeneration air inlet channel of the rotary dryer, so that the regeneration air flow The moisture-absorbing material in the separated chamber in which the channel communicates with the regenerated air outlet channel is regenerated. 13. The control method according to claim 12, further comprising: After the compressor switches from the stop state to the start state, shut down the fan of the refrigeration equipment.