CN209947794U - Waterproof encapsulation of photomultiplier based on microchannel plate structure - Google Patents
Waterproof encapsulation of photomultiplier based on microchannel plate structure Download PDFInfo
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- CN209947794U CN209947794U CN201920884159.2U CN201920884159U CN209947794U CN 209947794 U CN209947794 U CN 209947794U CN 201920884159 U CN201920884159 U CN 201920884159U CN 209947794 U CN209947794 U CN 209947794U
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Abstract
The utility model discloses a photomultiplier's waterproof encapsulation based on microchannel plate structure, including metal-back, encapsulating shell, embedment glue and sealing layer, the metal-back is the straight section of thick bamboo structure of area bottom of big-end-up's reducing, metal-back upper portion bottom surface is equipped with the annular groove that holds photomultiplier kovar metal dish, and the lower part lateral wall is equipped with the cable fairlead, the encapsulating shell erects in the metal-back, photomultiplier bottom inserts through kovar metal dish in the metal-back, shelves on the annular groove of metal-back, divide into upper and lower two cavities with the metal-back; the glue pouring shell is positioned at the bottom of the kovar metal disc. The utility model is provided with a metal shell for accommodating the lower part of the photomultiplier and bearing external water pressure; a glue pouring shell in soft contact with the photomultiplier is arranged in the inner part of the shell, and filling of pouring glue is realized in the glue pouring shell and between the metal shell and the transition joint; the outer part is integrally coated with a sealing layer; multiple sealing is formed, the structure is stable, and the sealing reliability is high.
Description
Technical Field
The utility model belongs to the technical field of photomultiplier's encapsulation technique and specifically relates to a photomultiplier's waterproof packaging based on microchannel plate structure.
Background
Photomultiplier tubes are vacuum electronic devices that convert weak optical signals into electrical signals. Photomultiplier tubes are mainly used in optical measuring instruments and spectroscopic analyzers. The photomultiplier based on the microchannel plate structure comprises a glass shell (an inner wall evaporation photocathode) similar to a bulb shape, a glass transition section, a kovar metal plate, a microchannel plate component and pins. The upper Kovar and the glass transition joint are sintered together and are sealed with the lower Kovar in an indium sealing mode, so that the vacuum of the photomultiplier is kept. The transition section is composed of glasses with different thermal expansion coefficients. Through multi-stage transition, the thermal expansion coefficient of the glass directly contacting with the kovar metal is close to that of the kovar as much as possible. In the structure, the joint of the upper kovar and the transition joint and the indium sealing part are weak links.
In the experimental project of the micro-electron in the river, 15000 pieces of 20-inch photomultiplier based on a micro-channel plate structure are used, placed in pure water with the depth of 45 meters and operated for 20 years, so that the electronic circuit board (voltage divider) and pins are required to be prevented from being in contact with water to cause failure, and the two weak links are required to be protected to prevent the high vacuum state in the glass shell from being lost due to the damage of water pressure.
SUMMERY OF THE UTILITY MODEL
The utility model provides a photomultiplier's waterproof packaging based on microchannel plate structure realizes the long-term reliable sealed of photomultiplier.
In order to realize the purpose of the utility model, the utility model provides a following technical scheme: a waterproof packaging structure of a photomultiplier based on a microchannel plate structure comprises a metal shell, a glue filling shell, a pouring sealant and a sealing layer, wherein the metal shell is a reducing bottomed straight-tube structure with a large upper part and a small lower part, an annular groove for accommodating a Kovar metal disc of the photomultiplier is arranged on the bottom surface of the upper part of the metal shell, a cable leading-out pipe is arranged on the side wall of the lower part of the metal shell, the glue filling shell is erected in the metal shell, the bottom of the photomultiplier is inserted into the metal shell through the Kovar metal disc and is placed on the annular groove of the metal shell, and the metal shell is divided into an upper cavity and a lower cavity; the glue pouring shell is positioned at the bottom of the kovar metal disc; the pouring sealant comprises a first pouring sealant and a second pouring sealant, the first pouring sealant is filled in the pouring shell, and the second pouring sealant is filled in the upper cavity of the metal shell; the sealing layer comprises a sealing adhesive tape and an isolating layer, and the isolating layer is coated outside the sealing adhesive tape; the sealing layer coats the upper part of the metal shell, the lower part of the photomultiplier and the joint of the metal shell and the photomultiplier.
Preferably, an adhesive is arranged between the bottom of the photomultiplier and the glue filling shell.
Preferably, the second pouring sealant comprises flexible glue and rigid glue, and the rigid glue is arranged below the flexible glue.
Preferably, the package structure further comprises an ABS block, wherein the ABS block is annular and is arranged at the connection position.
Preferably, an electronic circuit board connected with the photomultiplier is embedded in the first pouring sealant.
Preferably, the isolation layer is a heat-shrinkable tube layer.
Preferably, a circuit board connected with the photomultiplier is embedded in the first pouring sealant.
Preferably, the cable outlet pipe is higher than the bottom of the metal shell.
Preferably, the groove is internally provided with bonding glue.
Compared with the prior art, the utility model has the advantages of it is following: a metal shell for accommodating the lower part of the photomultiplier is arranged and bears external water pressure; a glue pouring shell in soft contact with the photomultiplier is arranged in the inner part of the shell, and filling of pouring glue is realized in the glue pouring shell and between the metal shell and the transition joint; the outer part is integrally coated with a sealing layer; multiple sealing is formed, the structure is stable, and the sealing reliability is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural view of a waterproof package of a photomultiplier tube based on a microchannel plate structure according to the present invention;
graphic notation:
1. a metal shell; 10. a photomultiplier tube; 11. a kovar metal disk; 2. pouring a rubber shell; 3. a first pouring sealant; 4. second pouring sealant; 41. flexible glue; 42. a rigid glue; 5. bonding glue; 6. a circuit board; 7. an ABS plug; 8. a sealing layer; 81. sealing the adhesive tape; 82. an isolation layer; 9. and a cable outlet pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
As shown in fig. 1, a waterproof package of a photomultiplier 10 based on a microchannel plate structure comprises a metal shell 1, a potting adhesive shell 2 and a potting adhesive, wherein the metal shell 1 is a reducing bottomed straight cylinder structure with a large upper part and a small lower part, an annular groove for accommodating a kovar metal disc 11 of the photomultiplier 10 is arranged on the bottom surface of the upper part of the metal shell 1, a cable outlet pipe 9 is arranged on the side wall of the lower part, the potting adhesive shell 2 is erected in the metal shell 1, the bottom of the photomultiplier 10 is inserted into the metal shell 1 through the kovar metal disc 11 and is placed on the potting adhesive shell 2, and the metal shell 1 is divided into an upper cavity and a lower cavity; the pouring sealant comprises a first pouring sealant 3 and a second pouring sealant 4, wherein the first pouring sealant 3 is filled in the pouring shell 2, and the second pouring sealant 4 is filled in an upper cavity of the metal shell 1.
The metal shell 1 plays a role in supporting the bottom of the photomultiplier tube 10, and the photomultiplier tube 10 is stably connected with the circuit board 6; the potting shell 2 is arranged in the metal shell 1, so that the circuit board 6 can be conveniently and fixedly connected with a cable, meanwhile, the potting shell 2 is filled with the first potting adhesive 3, waterproof sealing is carried out on the circuit board 6 and pins between the circuit board and the photomultiplier tube 10, and water is prevented from entering from the bottom of the photomultiplier tube 10.
In addition, a second potting adhesive 4 is filled between the upper part of the metal shell 1 and the photomultiplier tube 10, and the lower part of the photomultiplier tube 10 is filled and sealed by the second potting adhesive 4, so that water is prevented from entering the bottom of the photomultiplier tube 10.
To sum up, the bottom of the photomultiplier 10 is well encapsulated by the stable frame provided by the metal shell 1 and the filling of two potting adhesives, so that water is prevented from entering.
Wherein the glue pouring shell 2 is made of ABS plastic.
In order to improve the sealing performance between the photomultiplier tube 10 and the potting shell 2, a bonding adhesive 5 is arranged between the bottom of the photomultiplier tube 10 and the potting shell 2. Correspondingly, the adhesive 5 is also added between the kovar metal disc of the photomultiplier 10 and the metal shell 1, so that the connection strength and the sealing property between the kovar metal disc and the metal shell are enhanced.
The packaging structure further comprises an ABS plug block 7, wherein the ABS plug block 7 is annular and is located at the joint and erected on the metal shell 1 to form transition between the metal shell 1 and the photomultiplier 10 and provide support for subsequent outer layer sealing.
The waterproof package further comprises a sealing layer 8, and the sealing layer 8 covers the upper part of the metal shell 1, the lower part of the photomultiplier tube 10 and the joint of the two. The sealing layer 8 comprises a sealing adhesive tape 81 and an isolation layer 82, and the isolation layer 82 is coated outside the sealing adhesive tape 81. The isolation layer 82 is a heat shrinkable tube layer. Specifically, the sealing tape is composed of two layers of butyl rubber of the sealing tape 81 and a heat-shrinkable tube of the isolation layer 82, and the butyl rubber is a waterproof and sealing basic waterproof material of the whole photomultiplier tube 10 and completely isolates an external liquid medium from an internal structure. The fixed inside waterproof rubber layer of pyrocondensation pipe is fixed waterproof rubber layer and casing, and isolated pure water and waterproof rubber layer avoid polluting outside medium.
The first pouring sealant 3 is embedded with a circuit board 6 connected with the photomultiplier tube 10, and is used for providing required voltage for the photomultiplier tube 10, ensuring the work of the photomultiplier tube 10 and leading out signals of the photomultiplier tube 10.
The metal shell 1 is of a reducing straight-cylinder structure with a large upper part and a small lower part, and a cable leading-out pipe 9 is arranged on the side wall of the lower part; preferably, the cable outlet pipe 9 is higher than the bottom of the metal shell 1.
The waterproof package is suitable for sealing the photomultiplier tube 10 with the kovar metal plate, requires a failure rate of less than 0.5% within six years, and has high reliability.
The manufacturing method of the waterproof package comprises the following steps:
1. a circuit board (voltage divider) is welded to a pin of the photomultiplier, on one hand, the photomultiplier is loaded with working voltage through a cable and the voltage divider, on the other hand, an electric signal from the photomultiplier is led out, and the electric signal is transmitted to electronics for measurement and storage.
2. The glue pouring shell is adhered to the Kovar metal disc of the photomultiplier by using adhesive glue, so that the voltage divider is positioned in a cavity formed by the glue pouring shell and the Kovar metal disc, and the cavity is filled with first pouring glue to completely wrap the voltage divider. The first waterproof function is achieved.
3. The metal shell is attached to the photomultiplier tube lower covar with an adhesive, where an elastomeric adhesive must be used to protect the indium seal. Therefore, the photomultiplier, the voltage divider, the potting shell, the first potting adhesive filled in the potting shell and the metal shell form a whole.
4. And injecting rigid glue of the second pouring sealant into the upper cavity of the metal shell, wherein the purpose of the glue is to play a role in stabilizing the structure. The height should be controlled below the upper covey and transition junction. The contact between the glue and the glass transition joint is avoided, and the damage of the stress of the glue to the glass is prevented.
5. And installing an ABS chock block to the upper edge of the metal shell to form a complete glue filling cavity and prepare for coating the outer layer of the sealing adhesive tape.
6. And injecting flexible glue of the second pouring sealant into the cavity until the upper edge of the ABS stopper. The purpose of this glue is to provide a secondary water-proofing function and to effectively protect the glass transition joint from damage.
7. And coating a sealing adhesive tape on the outer sides of the ABS stopper and the large-caliber part of the metal shell, sleeving a heat-shrinkable tube on the ABS stopper and performing heat shrinkage by using a hot air gun to enable the sealing adhesive tape to be tightly attached to the outer side of the whole structure. The purpose of triple waterproofing is achieved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The utility model provides a photomultiplier's waterproof encapsulation based on microchannel plate structure which characterized in that: the photoelectric multiplier comprises a metal shell (1), a glue pouring shell (2), an encapsulating glue and a sealing layer, wherein the metal shell (1) is of a reducing straight-tube structure with a bottom, the upper part of the metal shell (1) is provided with a reducing annular groove for accommodating a Kovar metal disc of a photomultiplier (10), the lower side wall of the metal shell is provided with a cable leading-out pipe (9), the glue pouring shell (2) is erected in the metal shell (1), the bottom of the photomultiplier (10) is inserted into the metal shell (1) through the Kovar metal disc (11), the photomultiplier is placed on the annular groove of the metal shell (1), and the metal shell (1) is divided into an upper cavity and a lower cavity; the glue pouring shell (2) is positioned at the bottom of the kovar metal disc; the pouring sealant comprises a first pouring sealant (3) and a second pouring sealant (4), the first pouring sealant (3) is filled in the pouring shell (2), and the second pouring sealant (4) is filled in an upper chamber of the metal shell (1); the sealing layer (8) comprises a sealing adhesive tape (81) and an isolating layer (82), and the isolating layer (82) is coated outside the sealing adhesive tape (81); the sealing layer (8) covers the upper part of the metal shell (1), the lower part of the photomultiplier (10) and the joint of the metal shell and the photomultiplier.
2. The waterproof packaging structure of a photomultiplier tube based on a microchannel plate structure as claimed in claim 1, wherein: and an adhesive (5) is arranged between the bottom of the photomultiplier (10) and the glue filling shell (2).
3. The waterproof packaging structure of a photomultiplier tube based on a microchannel plate structure as claimed in claim 1, wherein: the second pouring sealant (4) comprises flexible glue (41) and rigid glue (42), wherein the rigid glue (42) is arranged below the flexible glue (41).
4. The waterproof packaging structure of a photomultiplier tube based on a microchannel plate structure as claimed in claim 1, wherein: the packaging structure further comprises an ABS plug block (7), wherein the ABS plug block (7) is annular and is erected in the connecting part.
5. The waterproof packaging structure of a photomultiplier tube based on a microchannel plate structure as claimed in claim 1, wherein: an electronic circuit board (6) connected with the photomultiplier is embedded in the first pouring sealant (3).
6. The waterproof packaging structure of a photomultiplier tube based on a microchannel plate structure as claimed in claim 1, wherein: the isolation layer (82) is a heat-shrinkable tube layer.
7. The waterproof packaging structure of a photomultiplier tube based on a microchannel plate structure as claimed in claim 1, wherein: and a circuit board (6) connected with the photomultiplier is embedded in the first pouring sealant (3).
8. The waterproof packaging structure of a photomultiplier tube based on a microchannel plate structure as claimed in claim 1, wherein: the cable leading-out pipe (9) is higher than the bottom of the metal shell (1).
9. The waterproof packaging structure of a photomultiplier tube based on a microchannel plate structure as claimed in claim 1, wherein: and adhesive glue is arranged in the groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920884159.2U CN209947794U (en) | 2019-06-12 | 2019-06-12 | Waterproof encapsulation of photomultiplier based on microchannel plate structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920884159.2U CN209947794U (en) | 2019-06-12 | 2019-06-12 | Waterproof encapsulation of photomultiplier based on microchannel plate structure |
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| CN209947794U true CN209947794U (en) | 2020-01-14 |
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| CN201920884159.2U Active CN209947794U (en) | 2019-06-12 | 2019-06-12 | Waterproof encapsulation of photomultiplier based on microchannel plate structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112259438A (en) * | 2020-10-22 | 2021-01-22 | 中国建筑材料科学研究总院有限公司 | Input window and preparation method and application thereof |
| CN116985395A (en) * | 2023-09-26 | 2023-11-03 | 四川辰宇微视科技有限公司 | High-precision and high-efficiency film laminating device and method for packaging micro-channel plate |
-
2019
- 2019-06-12 CN CN201920884159.2U patent/CN209947794U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112259438A (en) * | 2020-10-22 | 2021-01-22 | 中国建筑材料科学研究总院有限公司 | Input window and preparation method and application thereof |
| CN112259438B (en) * | 2020-10-22 | 2023-10-31 | 中国建筑材料科学研究总院有限公司 | Input window and preparation method and application thereof |
| CN116985395A (en) * | 2023-09-26 | 2023-11-03 | 四川辰宇微视科技有限公司 | High-precision and high-efficiency film laminating device and method for packaging micro-channel plate |
| CN116985395B (en) * | 2023-09-26 | 2023-11-28 | 四川辰宇微视科技有限公司 | High-precision and high-efficiency film laminating device and method for packaging micro-channel plate |
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