CN107238278B - Detachable box type window for microwave vacuum drying - Google Patents
Detachable box type window for microwave vacuum drying Download PDFInfo
- Publication number
- CN107238278B CN107238278B CN201710561405.6A CN201710561405A CN107238278B CN 107238278 B CN107238278 B CN 107238278B CN 201710561405 A CN201710561405 A CN 201710561405A CN 107238278 B CN107238278 B CN 107238278B
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- window
- circular waveguide
- box
- flange
- connecting flange
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Waveguide Connection Structure (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention provides detachable box-type windows for microwave vacuum drying, which comprises a window body, a second window body, a medium window sheet and a connecting piece, wherein the window body comprises a waveguide and a circular waveguide which are connected with each other, the second window body comprises a second waveguide and a second circular waveguide which are connected with each other, the medium window sheet is positioned between a circular waveguide and the second circular waveguide, the connecting piece is used for clamping and fixing the medium window sheet, a metal gasket is arranged between a window body and the second window body, the metal gasket is clamped through the connecting piece to realize electromagnetic sealing of the box-type window, and a sealing gasket is arranged between the window body and the medium window sheet to clamp the sealing gasket through the connecting piece to realize vacuum sealing of the box-type window.
Description
Technical Field
The invention relates to the technical field of microwave vacuum drying, in particular to detachable box-shaped windows for microwave vacuum drying.
Background
The microwave vacuum drying technology is a combination of a microwave system and a vacuum system, can reduce the drying temperature and accelerate the drying speed, and has the characteristics of high speed, high efficiency, low temperature and the like.
The box-shaped windows are used as types of microwave sealing windows, and have wide bandwidth, large bearing power and mature process, so is widely applied, sections of circular waveguides are inserted in the middle of rectangular waveguides in the traditional box-shaped windows, and dielectric window sheets are welded in the middle of the circular waveguides, as shown in figure 1, because the dielectric window sheets and the outer frames of the circular waveguides are in metal brazing connection, the box-shaped windows have good sealing performance, but have the defects of complex welding process, low yield, unremovable property, incapability of repairing, high maintenance cost and the like, particularly considering that the microwave bands used for industrial microwave drying are P bands (915MHz) and S bands (2450MHz), the welding difficulty of the dielectric window sheets is greatly increased after the size of the sealing windows is increased, the process is complex, and the reliability is reduced.
Disclosure of Invention
() problems to be solved
In view of the above technical problems, the present invention provides detachable box-type windows for microwave vacuum drying.
(II) technical scheme
According to aspects of the invention, detachable box type windows for microwave vacuum drying are provided, which comprise a th window, a second window, a medium window sheet and a connecting piece, wherein the th window comprises a th waveguide and a th circular waveguide which are connected with each other, the second window comprises a second waveguide and a second circular waveguide which are connected with each other, the medium window sheet is positioned between a th circular waveguide and the second circular waveguide, and the connecting piece is used for clamping and fixing the medium window sheet.
(III) advantageous effects
According to the technical scheme, the detachable box-type window for microwave vacuum drying has at least beneficial effects:
(1) the detachable box-shaped window has the advantages that the brazing process of the medium window sheet and the circular waveguide outer frame is omitted, the manufacturing difficulty is reduced, the structure is simpler, the assembly is convenient, and the reliability is high;
(2) according to the invention, the sealing gasket is additionally arranged between the medium window sheet and the circular waveguide section, so that vacuum sealing is realized, the structure is simple, and the sealing reliability is higher;
(3) according to the invention, the annealed metal pad is added between the two circular waveguide sections, so that the two circular waveguide sections are electrically connected, the structure is simple, and the reliability of electromagnetic shielding is high;
(4) according to the invention, the side of the detachable box-shaped window close to the drying cavity is filled with the hydrophobic wave-transmitting material, so that water vapor can be effectively isolated without influencing the transmission of microwaves;
(5) because the box-shaped window is detachable, when part of parts in the box-shaped window are damaged, the box-shaped window can be conveniently detached and maintained, and the maintenance cost of the box-shaped window is reduced.
Drawings
Fig. 1 is a plan view of a conventional box type window in the prior art.
Fig. 2 is an external view of the detachable box type window according to the embodiment of the present invention.
Fig. 3 is a schematic structural view of a detachable box window according to an embodiment of the present invention.
Fig. 4 is a partially enlarged schematic view of fig. 3.
Fig. 5 is a left side view of fig. 3.
Fig. 6 is another schematic diagram of a detachable box window according to an embodiment of the invention.
Fig. 7 is a partially enlarged schematic view of fig. 6.
Fig. 8 is another schematic diagram of a removable box window in accordance with an embodiment of the invention.
Fig. 9 is a partially enlarged schematic view of fig. 8.
Fig. 10 is a schematic view of the installation gap when the connecting member is not tightened in the embodiment of the present invention.
[ Main element ]
1- th window;
11- th rectangular waveguide flange;
12- th rectangular waveguide;
13- th circular waveguide;
14- th connecting flange;
141- th attachment flange holes;
142-mating bosses;
2-a second window;
21-a second rectangular waveguide flange;
22-a second rectangular waveguide;
23-a second circular waveguide;
24-a second connecting flange;
241-a second attachment flange aperture;
242-mating step;
243-filling the groove;
3-a dielectric pane;
4-a metal pad;
5-a sealing gasket;
6-connecting piece;
7-hydrophobic wave-transparent material;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.
In an exemplary embodiment of the present invention, detachable box-type windows for microwave vacuum drying are provided, fig. 2 is an external view of the detachable box-type window in the embodiment of the present invention, fig. 3 is a structural schematic view of the detachable box-type window in the embodiment of the present invention, fig. 4 is a partially enlarged structural schematic view of fig. 3, and fig. 5 is a left side view of fig. 3. as shown in fig. 2 to 5, the detachable box-type window for microwave vacuum drying of the present invention includes a window 1, a second window 2, a dielectric window sheet 3, and a connecting member 6. the dielectric window sheet 3 is disposed between the window 1 and the second window 2, and the dielectric window sheet 3 is clamped and fixed by the connecting member 6, wherein the window 1 includes rectangular waveguide 12 and circular waveguide 13 connected to each other, the second window 2 includes a second rectangular waveguide 22 and a second circular waveguide 23 connected to each other, and the dielectric window sheet 3 is disposed between the circular waveguide 13 and the second circular waveguide 23, and the dielectric sheet 3 is clamped and fixed between the second circular waveguide by the connecting member 6.
For the th window body 1 and the second window body 2, considering the complex shape and the requirement of the box-shaped window for the material conductivity, the windows can be manufactured by combining aluminum material forming processing and argon arc welding, because the argon arc welding process is mature, the th window body 1 and the second window body 2 have high reliability and greatly reduce the number of parts in the box-shaped window, for the dielectric window sheet 3, considering the strength requirement and the low dielectric loss in the vacuum pumping, can select alumina porcelain and polytetrafluoroethylene plates, and for the connecting piece 6, the window mainly comprises a bolt, a nut, an elastic cushion and a flat cushion.
The window 1 further includes a th attachment flange 14 disposed on the th circular waveguide 13 correspondingly, the second window 2 further includes a second attachment flange 24 disposed on the second circular waveguide 23. the th attachment flange 14 includes a th attachment flange hole 141, the second attachment flange 24 includes a second attachment flange hole 241, and the th attachment flange hole 141 is aligned with the second attachment flange hole 241 and coupled using the connector 6.
In the embodiment, the window 1 further includes a th rectangular waveguide flange 11 connected to the th rectangular waveguide 12 for external connection of the removable box window, and correspondingly, the second window 2 further includes a second rectangular waveguide flange 21 connected to the second rectangular waveguide 22 for external connection of the removable box window.
The detachable box type window of the present invention further includes a metal pad 4 disposed between the th connecting flange 14 and the second connecting flange 24 to electrically connect the th circular waveguide 13 with the second circular waveguide 23, thereby preventing electromagnetic leakage, and in particular, the metal pad 4 is disposed at the bottom of the mating protrusion 142 of the th connecting flange 14 to contact with the mating step 242 of the second connecting flange 24.
The annealed metal pad 4 has a reduced elastic modulus and yield strength, and is more easily deformed when the connecting member 6 is strained, so that reliable electrical connection between the window 1 and the second window 2 can be ensured, and microwave leakage can be avoided.
The detachable box-shaped window further comprises a sealing gasket 5 which is arranged between the medium window piece 3 and the second connecting flange 24, so that the detachable box-shaped window is vacuum-sealed when being externally connected. Specifically, the gasket 5 is disposed in the filling groove 243 of the second connection flange 24.
The gasket 5 may be a teflon gasket or an O-ring of fluororubber, and the compression amount is 10% to 30% as in .
In another embodiment, as shown in fig. 6 and 7, the sealing gaskets 5 are disposed between the th connecting flange 14 and the dielectric window 3, and between the dielectric window 3 and the second connecting flange 24, so as to achieve double-sided sealing, which has the advantages of better sealing effect, and no requirement for the installation direction of the detachable box-type window (for the box-type window structure shown in fig. 3 and 4, in order to achieve better drying effect when performing microwave vacuum drying, connects the second window with the drying cavity), specifically, the sealing gaskets 5 are respectively disposed on the step of the th connecting flange 14, which is engaged with the sealing gasket 5, and in the filling groove 243 of the second connecting flange 24.
In another embodiment , the gasket 5 is integrally formed with the dielectric louver 3 as shown in fig. 8 and 9, which reduces the number of parts and improves reliability.
Considering that a great amount of water vapor is generated in the drying cavity during the microwave vacuum drying process, in order to prevent the water vapor from entering the box-shaped window and condensing into small water drops to cause the window explosion, the side of the box-shaped window close to the drying cavity can be filled with the hydrophobic wave-transmitting material 7, so that the water vapor can be effectively isolated, and the transmission of microwaves is not influenced, as shown in fig. 3.
For the hydrophobic wave-transmitting material 7, the absorption of the microwave is very weak, and the transmission of the microwave is not influenced; and the surface is hydrophobic, the water absorption rate is very low, and water vapor can be effectively isolated. Preferably, the hydrophobic wave-transmitting material 7 may be a foamed polyethylene sheet or a polytetrafluoroethylene sheet.
The removable box window of the present invention is specifically installed by first filling the gasket 5 in the filling groove 243 of the second coupling flange 24, then placing the dielectric louver 3 in the mating step 242 of the second coupling flange 24, with the dielectric louver 3 abutting against the gasket 5 with clearance from the bottom edge of the mating step 242, with a clearance size a, as shown in fig. 10, then placing the annealed metal gasket 4 on the bottom of the mating projection 142 of the coupling flange 14, then inserting the mating projection 142 into the mating step 242, aligning the coupling flange hole 141 and the second coupling flange hole 241 so that the wide sides of the rectangular waveguide flange 11 and the second rectangular waveguide flange 21 are flush, and coupling using the connector 6, when the connector 6 is not tightened, the metal gasket 4 and the mating step 242 have clearance, with a clearance size b, as shown in fig. 10, finally, uniformly tightening the connector 6, the metal gasket 4 and the mating step 242 without clearance, as shown in fig. 4, and further, the hydrophobic wave-permeable material is filled in the second coupling flange 22.
For the gap a and the gap b mentioned in the installation process, the physical meaning of the gap a is the maximum compression amount of the sealing gasket 5 after the connecting piece 6 is screwed, the physical meaning of the gap b is the difference value of the compression amount of the sealing gasket 5 after the connecting piece 6 is screwed, which is larger than the compression amount of the metal gasket 4, and in order to ensure air tightness and avoid electromagnetic leakage, takes the value of a as 0.5mm and the value of b as 0.05 mm.
After the detachable box-type window is assembled, the th circular waveguide 13 and the second circular waveguide 23 jointly form a circular waveguide section in the box-type window, the dielectric window 3 is clamped and fixed in the circular waveguide section by the connecting piece 6, the sealing gasket 5 is mainly used for matching with the dielectric window 3 to realize vacuum sealing, the metal gasket 4 is mainly used for connecting the th window body 1 and the second window body 2 to avoid electromagnetic leakage of the window bodies, the th rectangular waveguide flange 11 and the second rectangular waveguide flange 21 are manufactured according to the corresponding standards of the waveguide flanges and are external connection interfaces of the box-type window, and the th rectangular waveguide 12 and the second rectangular waveguide 22 mainly play roles in transmitting microwaves and connecting the circular waveguide and the rectangular waveguide flange.
The present embodiment has been described in detail with reference to the accompanying drawings, and from the above description, those skilled in the art should clearly understand kinds of detachable box-type windows for microwave vacuum drying.
It is to be noted that, in the attached drawings or in the description, the implementation modes not shown or described are all the modes known by the ordinary skilled person in the field of technology, and are not described in detail. Furthermore, the above definitions of the various elements and methods are not limited to the particular structures, shapes or arrangements of parts mentioned in the examples, which may be easily modified or substituted by one of ordinary skill in the art, for example:
(1) the th rectangular waveguide flange 11, the second rectangular waveguide flange 21 can also take the form of circular flanges, square flanges, etc.
(2) The th rectangular waveguide 12, the second rectangular waveguide 22 can also take the form of a circular waveguide, a square waveguide, a flat rectangular waveguide, etc.
It is also noted that the illustrations herein may provide examples of parameters that include particular values, but that these parameters need not be exactly equal to the corresponding values, but may be approximated to the corresponding values within acceptable error tolerances or design constraints. Directional phrases used in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., refer only to the direction of the attached drawings and are not intended to limit the scope of the present invention. In addition, unless steps are specifically described or must occur in sequence, the order of the steps is not limited to that listed above and may be changed or rearranged as desired by the desired design. The embodiments described above may be mixed and matched with each other or with other embodiments based on design and reliability considerations, i.e., technical features in different embodiments may be freely combined to form further embodiments.
In summary, the present invention provides detachable box-shaped windows for microwave vacuum drying, in the present invention, a circular waveguide section in a conventional box-shaped window is divided into two, a dielectric window piece is placed on a matching interface of two circular waveguide sections, and the circular waveguide section and the dielectric window piece are compressed by designing a connecting flange on the circular waveguide section, wherein a sealing gasket is arranged between the dielectric window piece and the circular waveguide section, the sealing gasket is compressed by a connecting piece to realize vacuum sealing of the box-shaped window, a metal gasket is arranged between the two circular waveguide sections, and the metal gasket is compressed by the connecting piece to realize electric connection of the two circular waveguide sections, thereby avoiding electromagnetic leakage.
The box-shaped window manufactured by the method has the advantages that the brazing process of the medium window sheet and the circular waveguide outer frame is omitted, the structure is simpler, the assembly is easy, and the reliability is high. In addition, because the box type window is detachable, when part of parts in the box type window are damaged (such as the breakage of the medium window sheet), the box type window can be conveniently detached and maintained, and the maintenance cost of the box type window is reduced.
The invention may be embodied by means of hardware comprising several distinct elements, and by means of a suitably programmed computer, in a unit claim enumerating several means, several of these means may be embodied by one and the same item of hardware, the use of the words , second, third, etc. may indicate any sequence.
Furthermore, the use of ordinal numbers such as "", "second", "third", etc., in the specification and claims to modify a corresponding element is not intended to imply any ordinal numbers for the element, nor the order in which a element is sequenced to another element, or the order in which a manufacturing method is sequenced, but rather the use of such ordinal numbers is merely used to distinguish between a element having a certain name and an element having the same name as another element.
It should be noted that the same elements are denoted by the same or similar reference numerals throughout the drawings, and in the following description, specific embodiments are for illustrative purposes only and should not be construed as limiting the present invention in any way, but merely as exemplifications of embodiments of the present invention.
The above-mentioned embodiments, object, technical solutions and advantages of the present invention have been described in , it should be understood that the above-mentioned embodiments are only examples of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1, A removable box window for microwave vacuum drying comprising:
an th window including a th waveguide and a th circular waveguide connected to each other;
a second window including a second waveguide and a second circular waveguide connected to each other;
a dielectric louver between the th circular waveguide and the second circular waveguide;
the connecting piece is used for clamping and fixing the medium window piece; wherein the content of the first and second substances,
the th window further comprises a th connecting flange with a flange hole, which is arranged on the th circular waveguide;
the second window body also comprises a second connecting flange with a flange hole, and the second connecting flange is arranged on the second circular waveguide;
the connecting piece is inserted into flange holes of the th connecting flange and the second connecting flange;
the medium window sheet is made of alumina porcelain or polytetrafluoroethylene;
the removable box window further comprises:
the metal pad is arranged between the th connecting flange and the second connecting flange, so that the th circular waveguide is electrically connected with the second circular waveguide, and electromagnetic leakage is avoided;
the sealing gasket is arranged between the medium window sheet and the second connecting flange, so that the vacuum sealing is realized when the detachable box-shaped window is externally connected; wherein the content of the first and second substances,
the metal gasket is arranged at the bottom of a matching boss of the th connecting flange and is contacted with a matching step of the second connecting flange;
during the installation, when the connecting piece did not begin to screw up, the medium window piece was hugged closely sealed pad, with there is fixed gap on the base of cooperation step, and the clearance size is an, the metal pad with the cooperation step has fixed gap, and the clearance size is b, and for guaranteeing airtight and avoiding electromagnetic leakage, is the a value of 0.5mm, and the b value is 0.05mm as a normal.
2. The removable box window of claim 1, wherein the metal gasket is an oxygen-free copper gasket or a red copper gasket, and the sealing gasket is a teflon gasket or an O-ring of viton.
3. The removable box window of claim 1, further comprising:
and the hydrophobic wave-transmitting material is arranged on the side of the detachable box-type window close to the drying cavity and is used for isolating water vapor without influencing the transmission of microwaves.
4. A demountable box window according to claim 3, wherein the hydrophobic, wave-transparent material is a foamed polyethylene sheet or a polytetrafluoroethylene sheet.
5. The removable box window of claim 1, wherein the connector comprises a bolt, a nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710561405.6A CN107238278B (en) | 2017-07-11 | 2017-07-11 | Detachable box type window for microwave vacuum drying |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710561405.6A CN107238278B (en) | 2017-07-11 | 2017-07-11 | Detachable box type window for microwave vacuum drying |
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| CN107238278A CN107238278A (en) | 2017-10-10 |
| CN107238278B true CN107238278B (en) | 2020-01-31 |
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| CN201710561405.6A Active CN107238278B (en) | 2017-07-11 | 2017-07-11 | Detachable box type window for microwave vacuum drying |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109712856B (en) * | 2018-12-29 | 2020-04-21 | 电子科技大学 | Electric vacuum energy transmission window structure |
| CN113623954A (en) * | 2020-05-08 | 2021-11-09 | 合肥三伍机械有限公司 | Drying equipment convenient to dismouting |
| CN112461461B (en) * | 2020-10-24 | 2022-08-12 | 山东长王检测技术有限责任公司 | Building exterior window air tightness detection device |
| CN112397853B (en) * | 2020-10-28 | 2021-12-14 | 中国电子科技集团公司第二十九研究所 | Waveguide flange connecting device capable of realizing quick assembling, disassembling and sealing |
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| JP2001338588A (en) * | 2000-05-30 | 2001-12-07 | Japan Atom Energy Res Inst | Gyrotron and its manufacturing method |
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| CN202067881U (en) * | 2011-05-27 | 2011-12-07 | 合肥海天电子科技有限公司 | High-power waveguide seal connecting device |
| CN105931936A (en) * | 2016-06-15 | 2016-09-07 | 西南交通大学 | High-power truncated microwave output window |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103094645B (en) * | 2013-01-06 | 2015-11-18 | 中国科学院等离子体物理研究所 | Novel high-power microwave vacuum ceramic window |
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|---|---|---|---|---|
| SU1478903A1 (en) * | 1987-08-10 | 1994-02-28 | Л.М. Федорцов | Energy lead of can design of vacuum shf device |
| JP2001338588A (en) * | 2000-05-30 | 2001-12-07 | Japan Atom Energy Res Inst | Gyrotron and its manufacturing method |
| GB2399690A (en) * | 2003-03-18 | 2004-09-22 | Quasar Microwave Tech | Transmission line pressure window assembly |
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