TWI774036B - Microwave drying device - Google Patents

Abstract

The invention relates to a microwave drying device, which comprises a processing box, two air extraction devices and two microwave emission modules. An outer wall of the processing box is provided with two installation openings arranged at intervals along a conveying direction, and two air extraction partitions and a plurality of channel partitions are arranged in the processing box. The air extraction baffle divides the box into an air extraction space and a microwave drying space. The channel baffles are arranged at intervals along the conveying direction so that the microwave drying space forms a traveling wave channel extending back and forth. The two ends of the traveling wave channel are connected to the two installations Open your mouth. The two microwave emitting modules are arranged to emit microwaves respectively towards the two installation openings. The air extraction device is communicated with the microwave drying space through the air extraction space. The object to be dried can be heated and dried by microwave through the microwave channel along the conveying direction. Thereby, the drying processing speed can be greatly increased, and the structure is compact and space-saving.

Description

Microwave drying device

This creation system relates to a microwave drying device, especially a continuous film microwave drying device applied to a roll-to-roll process.

At present, rechargeable electronic products mainly use lithium batteries as energy storage devices. A separator is arranged between the positive electrode and the negative electrode of the lithium battery, and the separator is a porous film made of polymer materials or non-woven fabrics, ceramics and other materials. While preventing the positive and negative electrodes from directly contacting and short-circuiting, the separator must also be able to absorb the electrolyte, so that the lithium ions can flow between the positive and negative electrodes, which has a great impact on the performance of the lithium battery.

The separator needs to be dried before adding the electrolyte to ensure the performance of the assembled lithium battery. However, the drying process of the existing separator is very time-consuming. Generally speaking, the separator (including the ceramic separator) will be left in a drying room for three days, and then baked in a vacuum oven for 8 hours before the separator can be fully dried. , very time consuming. In addition, because the isolation film is not resistant to high temperature, the temperature of the oven needs to be less than 100 degrees, which makes it difficult to shorten the drying time. In addition, drying chambers and ovens also have the problem of being bulky and taking up too much space.

Therefore, the existing drying technology of the separator needs to be improved.

In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a microwave drying device, which uses microwaves to uniformly heat and dry the isolation film, so as to greatly increase the drying speed.

In order to achieve the above-mentioned creation purpose, the technical means used in this creation is to design a microwave drying device, including: a processing box, which is a hollow body, and has: two conveying outer walls, the two conveying outer walls are spaced along a conveying direction. Each of the conveying outer walls has a box conveying opening; an installation outer wall is connected between the two conveying outer walls and has two installation openings; the two installation openings are arranged at intervals along the conveying direction; a closed outer wall is connected to the Between the two conveying outer walls, the installation outer wall and the closed outer wall are respectively located on opposite sides of the processing box; at least one air extraction baffle is installed in the processing box and divides the inner space of the processing box at least an air extraction space and a microwave drying space; a plurality of air extraction holes are formed through the at least one air extraction partition; a plurality of channel partitions are arranged in the microwave drying space; the channel partitions are arranged at intervals along the conveying direction and are The microwave drying space is formed into a traveling wave channel extending back and forth in a zigzag manner. The opposite ends of the traveling wave channel are respectively connected to the two installation openings. an air extraction space; each channel partition has a partition conveying opening; the partition conveying openings of the channel partitions and the two box conveying openings of the two conveying outer walls are located in a straight line; at least one air extraction device , which communicates with the at least one air extraction space; two microwave emission modules, which are arranged on the installation outer wall of the processing box, and emit microwaves toward the traveling wave channel; the two microwave emission modules respectively emit microwaves toward the two installation openings ; The microwave frequencies emitted by the two microwave transmitting modules are different.

When the invention is in use, the articles to be dried enter the processing box through one of the box conveying openings of the processing box, and then the articles pass through the tortuous traveling wave channel through the baffle conveying opening, and are heated and dried in the traveling wave channel. Afterwards, it is passed through another box conveying opening of the processing box.

The advantages of this creation are:

First, when the article to be dried passes through the traveling wave channel, it will absorb the traveling wave energy in the traveling wave channel and be heated and dried. Because microwaves easily penetrate the article, the surface and the interior of the article are heated and heated at the same time. Therefore, compared with the prior art of standing and baking, the present invention can greatly shorten the time required for drying treatment, and the volume is small and space-saving.

Second, the sidewalls of each channel segment (ie, channel partitions) formed by back and forth in the traveling wave channel are all shared with adjacent channel segments, that is, each channel partition simultaneously forms the sidewalls of two channel segments. Thereby, less material is required for forming the traveling wave channel, which can reduce the weight and save the cost, and make the structure more compact, which has the effect of further saving space.

Third, by arranging the two installation openings for the corresponding microwave emitting modules on the same side of the processing phase, even if the two microwave emitting modules are installed outside the processing box, the total width of the invention (that is, perpendicular to the transport The dimension in the direction) is still the same as the total width when only a single microwave emitting module is installed. Therefore, the structure of this invention is more compact when two microwave emitting modules are installed, which can save more space.

Fourth, by separating the air extraction space with the air extraction partition in the processing box, the liquid vapor in the microwave drying space can be quickly and evenly drawn out of the creation through the air extraction holes on the air extraction partition, which can improve the drying effect. .

By arranging two microwave emitting modules on the installation outer wall of the processing box, and respectively emitting microwaves toward opposite ends of the traveling wave channel, the effect of microwave drying and dehydration can be increased.

Further, in the microwave drying device, the microwave frequency emitted by one of the microwave emitting modules ranges from 2455 to 2465 MHz, and the microwave frequency emitted by the other microwave emitting module ranges from 2435 to 2445 MHz. In the case where microwave transmitting modules are installed at both ends of the traveling wave channel, the microwaves of the two microwave transmitting modules are likely to interfere with each other and cause phase locking, resulting in the occurrence of standing waves in the traveling wave channel, which in turn affects the uniform heating of the object to be heated. Spend. By appropriately staggering the frequencies emitted by the two microwave emitting modules, the phase locking can be improved and the heating uniformity can be improved.

Further, in the microwave drying device, each of the microwave emission modules includes a microwave source and at least one circulator, and the at least one circulator is connected in series between the microwave source and the corresponding installation opening; the At least one circulator enables microwave isolation from the corresponding mounting opening to the microwave source to exceed minus 40 decibels. By connecting a circulator (or circulator) in series between the microwave source (or magnetron) and the installation opening, when the overall isolation of the circulator exceeds minus 40 decibels (db), it can improve the ease of microwave transmission modules. The problem of phase locking due to mutual interference. In addition, when the overall isolation of the circulator exceeds 40 decibels, and the frequencies emitted by the two microwave transmitting modules are staggered at the same time, the phase-locking problem can be almost eliminated and the heating uniformity can be ensured.

Further, in the microwave drying device, the number of the at least one air extraction baffle and the at least one air extraction space is both two, the two air extraction spacers are arranged at intervals up and down, and the microwave drying space is formed in the at least one air extraction space. Between the two air extraction partitions; the number of the at least one air extraction device is two, and the two air extraction devices are respectively connected to the two air extraction spaces.

Further, in the microwave drying device, the processing box further has: two microwave side plates, which are arranged in the processing box, each of the microwave side plates and one of the conveying outer walls are spaced apart to form a microwave suppression space, the The microwave drying space is formed between the two microwave side plates; each of the microwave side plates has a microwave transmission opening, which communicates with the corresponding microwave suppression space and the microwave drying space, the two microwave transmission openings of the two microwave side plates, the The baffle conveying openings of the channel baffle and the two box conveying openings of the two conveying outer walls are located on a straight line; a plurality of microwave suppressing parts are arranged in the microwave suppressing space corresponding to each of the microwave side plates.

Further, in the microwave drying device, the separator conveying opening of each channel separator is an elongated opening.

Further, in the microwave drying device described above, the traveling wave channel comprises: a plurality of straight line segments, which are parallel to each other and arranged along the conveying direction; a plurality of connecting segments, each of which connects two adjacent straight line segments. one end.

10: Processing box

101: Conveying the outer wall

102: Install the outer wall

103: Close the outer wall

104: Top Wall

105: Bottom wall

106: Box delivery opening

107: Mounting openings

11: Exhaust baffle

111: exhaust hole

12: Channel partition

121: Baffle conveying opening

13: Microwave Side Plate

131: Microwave delivery opening

14: Air extraction space above

15: Air extraction space below

16: Microwave drying space

17: Microwave Suppression Space

171: Microwave Suppressor

20: Microwave transmitter module

21: Microwave source

22: Circulator

30: Air extraction device

41: Traveling wave channel

411: Line segment

412: Connection segment

D: conveying direction

A: Isolation film

FIG. 1 is a perspective external view of the present invention.

FIG. 2 is a perspective view of the present invention from another angle.

FIG. 3 is an exploded view of a three-dimensional element of the present invention.

Figure 4 is an exploded view of the upper half of the processing box of the present invention.

Figure 5 is a top view of the present invention.

FIG. 6 is a schematic top sectional view of the processing box of the present invention.

Figure 7 is a schematic side sectional view of the present invention.

FIG. 8 is a schematic side sectional view of the present invention from another angle.

Please refer to FIG. 1 and FIG. 2 , the microwave drying device of the present invention includes a processing box 10 , two microwave emission modules 20 and two air extraction devices 30 . In this embodiment, the present invention is used to dry the separator A of the lithium battery in roll-to-roll form, but it is not limited to this. Heat and dry the non-slender film to be dried.

Please refer to FIG. 1 , FIG. 3 , FIG. 5 and FIG. 7 , the processing box 10 is a hollow body with two conveying outer walls 101 , an installation outer wall 102 , a closed outer wall 103 , a top wall 104 and a bottom wall 105 , two air extraction partitions 11 , a plurality of channel partitions 12 ; and in this embodiment, there are further two microwave side plates 13 . The two conveying outer walls 101 are arranged at intervals along a conveying direction D, and each conveying outer wall 101 has a box conveying opening 106 , and the box conveying opening 106 is preferably an elongated opening. The installation outer wall 102 is connected between the two conveying outer walls 101 and is preferably perpendicular to the two conveying outer walls 101 . The mounting outer wall 102 has two mounting openings 107 , and the two mounting openings 107 are arranged at intervals along the conveying direction D and are located on the same side of the processing box 10 . The closed outer wall 103 is connected between the two conveying outer walls 101, and the outer wall 102 is installed with the closed outer wall 101. The walls 103 are located on opposite sides of the processing box 10, respectively. In this embodiment, the processing box 10 is formed by cutting and assembling two substantially symmetrical metal blocks (as shown in FIG. 3 ), so most of the structure of the processing box 10 is also assembled from the two metal blocks. formed, but not limited thereto.

Please refer to FIG. 4 , FIG. 7 and FIG. 8 , two air extraction baffles 11 are arranged in the processing box 10 and are spaced up and down to separate the inner space of the processing box 10 into two extraction spaces and a microwave drying space. A space 16 , wherein the microwave drying space 16 is formed between the two air extraction partitions 11 . Specifically, one of the suction baffles 11 is spaced from the top wall 104 of the processing box to form an upper suction space 14 , and the other suction baffle 11 is spaced from the bottom wall 105 of the processing box 10 to form a lower suction space 14 . Evacuation space 15. A plurality of air extraction holes 111 are formed through each air extraction baffle 11 , and the air extraction holes 111 are preferably elongated openings extending along the conveying direction D. As shown in FIG. The above-mentioned two air extraction devices 30 are respectively connected to the upper air extraction space 14 and the lower air extraction space 15, so that the liquid vapor in the microwave drying space 16 can be quickly and uniformly extracted through the air extraction holes 111 on the air extraction baffle 11. outside. The air extraction device 30 is a conventional technology, so only a part of the air extraction pipe of the air extraction device 30 is shown in the drawings.

Please refer to FIG. 3 , FIG. 6 and FIG. 8 , two microwave side plates 13 are arranged in the processing box 10 and are located on opposite sides of all the channel partition plates 12 . Each microwave side plate 13 is spaced apart from one of the conveying outer walls 101 to form a microwave suppression space 17 . A plurality of microwave suppression members 171 are arranged in each microwave suppression space 17 , but the microwave suppression members 171 are not limited to the orderly arrangement. The aforementioned microwave drying space 16 is formed between the two microwave side plates 13 . Each microwave side plate 13 has a microwave transmission opening 131 (as shown in FIG. 8 ). The microwave transmission opening 131 communicates with the corresponding microwave suppression space 17 and the microwave drying space 16 . The microwave suppression space 17 is formed by disposing the microwave side plate 13 in between. Therefore, although the microwaves in the microwave drying space 16 will leak into the microwave suppression space 17 through the microwave transmission opening 131, the microwave suppression space 17 cooperates with the microwave suppression member 171 to prevent The microwaves further leak into the external environment via the tank delivery opening 106 of the delivery outer wall 101 .

Please refer to FIG. 3 , FIG. 6 , and FIG. 8 , the channel partitions 12 are arranged in the microwave drying space 16 , and the channel partitions 12 are arranged at intervals along the conveying direction D so that the microwave drying space 16 forms a traveling wave that zigzags back and forth. In the channel 41 , opposite ends of the traveling wave channel 41 are respectively connected to the two installation openings 107 . Specifically, each channel partition 12 is a long flat plate perpendicular to the conveying direction D; one end of half of the channel partitions 12 is connected to the mounting outer wall 102, the other end is spaced from the closed outer wall 103, and the other half of the channel partitions 12 One end is connected to the closed outer wall 103 , and the other end is spaced from the mounting outer wall 102 , so that the traveling wave channel 41 has a plurality of straight line sections 411 and a plurality of connection sections 412 . The straight sections 411 are parallel to each other and are arranged along the conveying direction D. One end of the two adjacent straight sections 411 is connected to each other through one of the connecting sections 412 (that is, each connecting section 412 connects one end of the two adjacent straight sections 411), but The traveling wave channel 41 is not limited to having the straight line segment 411 . In addition, in this embodiment, the two air extraction baffles 11 respectively form the top surface and the bottom surface of the traveling wave channel 41 .

Please refer to FIG. 3 , FIG. 7 and FIG. 8 , each of the channel partitions 12 has a partition conveying opening 121 , and the partition conveying opening 121 is preferably an elongated opening. One of the box conveying openings 106 of the outer wall 101, one of the microwave conveying openings 131 of the microwave side plate 13, the baffle conveying opening 121 of the channel partition, the microwave conveying opening 131 of the other microwave side plate 13, and the other conveying the outer wall 101 The box conveying openings 106 are sequentially arranged on a straight line for the isolation film A to pass through. In addition, the aforementioned delivery openings 106, 131, 121 are preferably all elongated openings. In addition, the suction holes 111 of the aforementioned suction partitions 11 communicate with the corresponding suction space and the traveling wave channel 41 .

Please refer to FIG. 1 , FIG. 5 and FIG. 6 , the two microwave transmitting modules 20 are disposed on the installation outer wall 102 of the processing box 10 , and respectively transmit microwaves toward the traveling wave channel 41 through the two installation openings 107 . The microwaves of the microwave transmitting module 20 form traveling waves in the traveling wave channel 41 , so that the isolation film A can be uniformly dried and dehydrated everywhere in the width direction. In other embodiments with lower requirements on drying performance, the present invention may also have only one microwave emitting module 20 to emit microwaves toward one of the installation openings 107 .

In addition, it has been found through experiments that in the case where the microwave transmitting modules 20 are installed at both ends of the traveling wave channel 41, the microwaves of the two microwave transmitting modules 20 are likely to interfere with each other and cause phase locking, resulting in traveling waves. A standing wave occurs in the channel 41, thereby affecting the drying uniformity of the isolation film A. Therefore, in this embodiment, the microwave frequencies emitted by the two microwave emitting modules 20 are different, thereby improving the phase locking and ensuring the uniformity of heating. Specifically, in order to obtain better effects, the frequency of the microwaves emitted by one of the microwave transmitting modules 20 is between 2455 and 2465 MHz, and the frequency of the microwaves emitted by the other microwave transmitting module 20 is between 2435 and 2445 MHz. In the embodiment with only one microwave transmitting module 20, the microwave frequency is preferably between 2420 and 2480 MHz.

Further, each microwave transmitting module 20 includes a microwave source 21 and two circulators 22 , and the two circulators 22 are connected in series between the microwave source 21 and the corresponding installation opening 107 . The function of the circulator 22 is to absorb microwaves from the microwave source 21 at the other end of the traveling wave channel 41 to isolate the microwave sources 21 of the two microwave transmitting modules 20 from each other, so as to protect the microwave sources 21 and improve the phase locking. The actual test found that the overall isolation degree of the circulator 22 of the single microwave transmitting module 20 exceeds minus 40 decibels (db), and when the frequencies of the two microwave sources 21 are appropriately staggered, the phase-locking phenomenon can almost disappear. However, the isolation of a single common commercial circulator 22 is about minus 23 decibels, so each microwave transmitting module 20 in this embodiment still needs to be connected with two circulators 22 in series, so that the corresponding installation openings 107 are connected to the corresponding The microwave isolation of the microwave source 21 (ie, the aforementioned overall isolation) exceeds minus 40 dB. When the isolation of a single circulator 22 exceeds minus 40 decibels, only one circulator 22 may be installed. In addition, when there is only one microwave transmitting module 20 in the present invention, phase locking will not occur, so only one common commercial circulator 22 needs to be installed.

Please refer to FIG. 1 , FIG. 5 and FIG. 8 . When the invention is in use, the isolation film A is passed through the processing box 10 along the conveying direction and moderately straightened. Then, the air extraction device 30 is activated first, and then the microwave emission mode is activated. Group 20, and then the feeding and receiving of the isolation film A is carried out. The microwave of the microwave emitting module 20 can make the liquid of the isolation film A evaporate quickly to achieve the drying effect. The liquid vapor generated during the drying process of the isolation film A enters the air extraction spaces 14 and 15 through the air extraction holes 111 , and is then evacuated by the air extraction device 30 . The actual experiment proves that the drying speed of this creation is about 10 meters per minute, which can greatly improve the drying speed of the isolation film A. Spend. In addition, the drying processing speed can be increased proportionally by increasing the number of straight sections 411 of the traveling wave channel 41 .

Another advantage of the present invention is that the two air extraction partitions 11 are respectively arranged on the top and the bottom of the microwave drying space 16, so when the air extraction device 30 is pumping air, the air extraction forces on the opposite sides of the isolation film A are approximately the same, Displacement and deformation of the two sides of the isolation film A due to uneven force can be avoided, resulting in friction between the isolation film A and the processing box 10 . However, the number of the air extraction partitions 11 is not limited to this. The present creation can also have only one air extraction partition 11 and only one air extraction space, but no matter the number of the air extraction partitions 11 in this creation is one or plural, The number of microwave drying spaces 16 is only one.

To sum up, the present invention uses microwaves to dry the separator A, which can greatly improve the drying speed. In addition, in the present invention, the traveling wave channel 41 and the air extraction spaces 14 and 15 are formed in the processing box 10 by means of the partition plate, and the two installation openings 107 corresponding to the microwave transmitting module 20 are arranged on the side of the processing box 10 . The same side, so that the structure of the present creation is more compact, which can save space, reduce weight and save cost.

The above is only the preferred embodiment of the creation, and does not limit the creation in any form. Although the creation has been disclosed as above in the preferred embodiment, it is not intended to limit the creation. Those of ordinary knowledge, within the scope of the technical solution of this creation, can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content disclosed above. The technical essence of the creation Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solution of the creation.

10: Processing box

101: Conveying the outer wall

103: Close the outer wall

104: Top Wall

106: Box delivery opening

20: Microwave transmitter module

21: Microwave source

22: Circulator

30: Air extraction device

A: Isolation film

Claims (7)

A microwave drying device, comprising: a processing box, which is a hollow body, and has: two conveying outer walls, the two conveying outer walls are arranged at intervals along a conveying direction, each of the conveying outer walls has a box conveying opening; an installation outer wall, It is connected between the two conveying outer walls and has two installation openings; the two installation openings are arranged at intervals along the conveying direction; a closed outer wall is connected between the two conveying outer walls, and the installation outer wall and the closed outer wall are respectively located at Opposite sides of the processing box; at least one suction partition, which is arranged in the processing box and divides the inner space of the processing box into at least one suction space and a microwave drying space; the at least one suction partition A plurality of air suction holes are formed through the plate; a plurality of channel separators are arranged in the microwave drying space; the channel separators are arranged at intervals along the conveying direction and make the microwave drying space form a traveling wave channel extending back and forth in a zigzag manner. Opposite ends of the traveling wave channel are respectively connected to the two installation openings, and the air extraction holes of the at least one air extraction baffle are connected to the traveling wave channel and the at least one air extraction space; each of the channel baffles has a baffle conveying opening ; The baffle conveying openings of these passage baffles and the two box conveying openings of the two conveying outer walls are located in a straight line; at least one air extraction device is connected to the at least one air extraction space; two microwave emission modules, It is arranged on the installation outer wall of the processing box, and emits microwaves toward the traveling wave channel; the two microwave emission modules respectively emit microwaves toward the two installation openings; the microwave frequencies emitted by the two microwave emission modules are different. The microwave drying device of claim 1, wherein the microwave frequency emitted by one of the microwave transmitting modules is between 2455 and 2465 MHz, and the microwave frequency emitted by the other microwave transmitting module is between 2435 and 2445 MHz. The microwave drying device according to claim 1 or 2, wherein each of the microwave emission modules comprises a microwave source and at least one circulator, and the at least one circulator is connected in series between the microwave source and the corresponding installation opening ; The at least one circulator makes the microwave isolation from the corresponding installation opening to the microwave source exceed minus 40 decibels. The microwave drying device according to claim 1 or 2, wherein: the number of the at least one air-extraction baffle and the at least one air-extraction space is two, the two air-extraction baffles are spaced up and down, and the microwave drying space is formed between the two air extraction partitions; the number of the at least one air extraction device is two, and the two air extraction devices are respectively connected to the two air extraction spaces. The microwave drying device according to claim 1 or 2, wherein the processing box further has: two microwave side plates, which are arranged in the processing box, each of the microwave side plates and one of the conveying outer walls are spaced apart to form a microwave suppression space , the microwave drying space is formed between the two microwave side plates; each of the microwave side plates has a microwave transmission opening, which communicates with the corresponding microwave suppression space and the microwave drying space, the two microwave transmission openings of the two microwave side plates, The baffle conveying openings of the channel baffles and the two box conveying openings of the two conveying outer walls are located on a straight line; a plurality of microwave suppressing parts are arranged in the microwave suppressing space corresponding to each of the microwave side plates. The microwave drying device according to claim 1 or 2, wherein the separator conveying opening of each channel separator is an elongated opening. The microwave drying device according to claim 1 or 2, wherein the traveling wave channel comprises: a plurality of straight line segments, which are parallel to each other and arranged along the conveying direction; a plurality of connecting segments, each of which connects two adjacent straight line segments one of the ends.

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