CN111968906B - Oil-proof packaging structure of photomultiplier, photomultiplier and oil-proof packaging method - Google Patents
Oil-proof packaging structure of photomultiplier, photomultiplier and oil-proof packaging method Download PDFInfo
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- CN111968906B CN111968906B CN202010958859.9A CN202010958859A CN111968906B CN 111968906 B CN111968906 B CN 111968906B CN 202010958859 A CN202010958859 A CN 202010958859A CN 111968906 B CN111968906 B CN 111968906B
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- cable
- photomultiplier
- oil
- kovar
- plastic shell
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J43/00—Secondary-emission tubes; Electron-multiplier tubes
- H01J43/04—Electron multipliers
- H01J43/28—Vessels, e.g. wall of the tube; Windows; Screens; Suppressing undesired discharges or currents
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J43/00—Secondary-emission tubes; Electron-multiplier tubes
- H01J43/04—Electron multipliers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
- H01J9/26—Sealing together parts of vessels
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
- H01J9/32—Sealing leading-in conductors
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- Manufacturing & Machinery (AREA)
- Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
- Measurement Of Radiation (AREA)
Abstract
The application provides an oil-proof packaging structure of a photomultiplier, the photomultiplier and an oil-proof packaging method. This grease proofing packaging structure of photomultiplier sets up the plastic casing through outside the bottom at the photomultiplier, and the Kovar dish upper space of photomultiplier fills the epoxy casting glue, improves photomultiplier's oil blanket reliability, can prevent that oil from getting into in the photomultiplier. In addition, the cable outlet pipe of the cable joint box is arranged at the cable outlet position of the oil-proof packaging structure, so that the polyurethane pouring sealant can be isolated from external oil, and the sealing performance of the outlet cable is improved.
Description
Technical Field
The application belongs to the technical field of photomultiplier tubes, and particularly relates to an oil-proof packaging structure of a photomultiplier tube, the photomultiplier tube and an oil-proof packaging method.
Background
At present, two problems exist in the oil seal product of the photomultiplier: 1. the tail part of the photomultiplier developed only by hamamatsu does not have a special-shaped structure of a metal kovar disk, so that the photomultiplier with the metal kovar disk is not suitable; 2. the existing oil seal product cannot effectively isolate polyurethane pouring sealant from external oil, and the polyurethane is directly contacted with the oil for a long time when the photomultiplier works, so that the long-term reliability is challenged. 3. The existing oil seal product can not effectively solve the reliable sealing of the cable, and part of the products find that oil enters the cable sealing structure.
Disclosure of Invention
Therefore, an object of the present invention is to provide an oil-proof packaging structure for a photomultiplier tube, and an oil-proof packaging method thereof, which can prevent oil from entering the photomultiplier tube.
In order to solve the above problem, the present application provides an oil-proof packaging structure of a photomultiplier, the photomultiplier includes a kovar plate, and this oil-proof packaging structure includes:
the plastic shell is in a groove shape, the wall of the groove is provided with a port for leading out a cable, and the port is connected with a cable joint in a sealing manner; the plastic shell is used for accommodating the kovar disc; the plastic shell is internally filled with epoxy pouring sealant which is used for contacting the outer wall of the photomultiplier and fixing the Kovar disc;
one end of the cable outlet pipe is arranged on the outer wall of the plastic shell at the interface, and the cable outlet pipe is sleeved on the cable led out from the interface; and epoxy pouring sealant is filled in the cable leading-out pipe.
Optionally, the other end of the cable outlet pipe is connected with a cable connector in a sealing mode.
Optionally, the groove of the plastic casing comprises an upper first wall and a lower second wall, the first wall having an inner diameter greater than an inner diameter of the second wall, the first wall and the second wall forming a step therebetween; the step is used for erecting the kovar disk.
Optionally, an annular groove is formed in the step, an adhesive material is filled in the annular groove, and the adhesive material is used for bonding the kovar disc and the plastic shell into a whole.
Optionally, the grease proofing packaging structure still includes the chock, the chock is annular plate-like, the chock is used for the cover to establish photomultiplier and lid close first wall body upper end.
Optionally, the stopper is provided with a rib inserted into the epoxy potting adhesive located within the plastic housing.
Optionally, when the plastic housing accommodates the kovar disc, the kovar disc divides the inside of the plastic housing into an upper portion accommodating the epoxy potting adhesive and a bottom portion having a cavity, and the upper portion of the cavity is filled with a polyurethane layer.
According to another aspect of the present application, there is provided a photomultiplier tube including:
a photomultiplier tube body;
the kovar disc is positioned at one end of the photomultiplier tube body;
the oil-proof packaging structure of the photomultiplier tube, which is described above, accommodates the kovar plate and a portion of the photomultiplier tube body therein.
Optionally, the photomultiplier tube further comprises a voltage divider for connecting a cable, and the voltage divider is located within the plastic housing.
According to another aspect of the present application, there is provided an oil-proof packaging method for a photomultiplier tube, the oil-proof packaging method including:
the cable of the photomultiplier penetrates out of the side wall of the lower part of the plastic shell, and the Kovar disc of the photomultiplier is fixed in the plastic shell;
pouring liquid epoxy pouring sealant above the Kovar disc, and curing;
the cable penetrates out of an interface gap of the plastic shell, and liquid polyurethane adhesive is poured into the plastic shell below the Kovar disc; integrally inverting the photomultiplier and the plastic shell, and curing the polyurethane adhesive;
a cable joint hermetically connected with the interface is sleeved on the cable; and a cable leading-out pipe is sleeved on the cable outside the interface, one end of the cable leading-out pipe is fixed on the cable connector, epoxy pouring sealant is filled in the cable leading-out pipe in a pouring mode, and the other end of the cable leading-out pipe is connected to the other end of the cable leading-out pipe in a sealing mode through the other cable connector.
The application provides a pair of grease proofing packaging structure of photomultiplier through setting up the plastic casing outside photomultiplier's bottom, and photomultiplier's Kovar dish upper space is filled the epoxy casting glue, improves photomultiplier's oil blanket reliability, can prevent that oil from getting into in the photomultiplier. In addition, the cable joint and the cable leading-out pipe are arranged at the cable leading-out position of the oil-proof packaging structure, so that the polyurethane pouring sealant can be isolated from external oil, and the sealing property of the leading-out cable is improved.
Drawings
FIG. 1 is a schematic view of an oil-proof packaging structure of a photomultiplier according to an embodiment of the present disclosure;
FIG. 2 is an enlarged view of a portion of the embodiment of the present application at A in FIG. 1;
fig. 3 is a partial enlarged view of the embodiment of the present application at B in fig. 1.
The reference numerals are represented as:
1. a photomultiplier tube; 2. a chock block; 21. a rib; 3. a kovar disc; 31. an annular groove; 4. a voltage divider; 5. a polyurethane; 6. a cavity; 7. a plastic housing; 8. a cable joint; 9. a cable; 10. a cable outlet pipe; 11. and (5) epoxy pouring sealant.
Detailed Description
Referring to fig. 1 in combination, according to an embodiment of the present application, an oil-proof packaging structure for a photomultiplier tube 1, the photomultiplier tube 1 includes a kovar plate 3, and the oil-proof packaging structure may include:
the plastic shell 7 is groove-shaped, the wall of the groove is provided with a port for leading out a cable 9, and the port is connected with a cable joint 8 in a sealing way; the plastic shell 7 is used for accommodating the kovar disk 3; the plastic shell 7 is filled with epoxy pouring sealant 11 which is used for contacting the outer wall of the photomultiplier tube 1 and fixing the Kovar disc 3;
one end of the cable outlet pipe 10 is arranged on the outer wall of the plastic shell 7 at the interface, and the cable outlet pipe 10 is sleeved on the cable 9 led out from the interface; the cable leading-out pipe 10 is filled with epoxy pouring sealant 11.
The plastic shell 7 is used as a groove-shaped shell of the packaging structure, the material components of the plastic shell 7 can comprise plastics such as ABS, PMMA, PA, PC and the like, the materials have low radioactivity, and the injection molding process is convenient, low in cost and good in stability.
Establish photomultiplier 1 that has kovar plate 3 structure in plastic casing 7 to fill epoxy casting glue 11 in kovar plate 3's top space, improve photomultiplier 1's oil blanket reliability, can prevent that oil from getting into photomultiplier 1 in.
In addition, in order to improve the oil-proof performance of the leading-out position of the cable 9, the cable joint 8 is arranged at the leading-out position of the cable 9, the cable leading-out pipe 10 is arranged outside the plastic shell 7, and the epoxy pouring sealant 11 is filled inside, so that the problem that the existing oil seal product is poor in sealing performance can be effectively solved.
In some embodiments, the other end of the cable outlet tube 10 is sealingly connected to a cable connector 8.
Further connect cable joint 8 at the other end of cable eduction tube 10, sealing connection cable joint 8 can improve the leakproofness of cable eduction tube 10, avoids in the oil gets into cable eduction tube 10, and oil proof performance of oil-proof packaging structure also obtains improving correspondingly.
In some embodiments, the groove of the plastic casing 7 comprises an upper first wall and a lower second wall, the first wall having an internal diameter greater than the internal diameter of the second wall, the first wall and the second wall forming a step therebetween; the steps are used for erecting the kovar tray 3.
The plastic shell 7 is designed to be step-shaped, so that the stability of the kovar disc 3 arranged in the plastic shell 7 can be improved; meanwhile, the Kovar plate 3 can separate the interior of the plastic shell 7, so that the epoxy pouring sealant 11 can be conveniently poured in a directional mode.
In some embodiments, an annular groove 31 is provided on the step, said annular groove 31 being filled with a gluing material, preferably the annular groove 31 is filled with a gluing material, which can be used to glue the kovar disc 3 and the plastic casing 7 together. Further improving the stability of the photomultiplier tube 1 and the plastic housing 7.
In some embodiments, the oil-proof package structure further includes a plug 2, wherein the plug 2 is in a ring shape and is used for sleeving the photomultiplier tube 1 and covering the upper end of the first wall. Further, the chock 2 is provided with a rib 21 which can be inserted into the epoxy potting adhesive 11 located in the plastic housing 7.
An annular plate-shaped plug block 2 is covered on a groove at the upper part of the kovar disc 3, so that the protection effect is further enhanced; in order to improve the connection strength between the chock 2 and the plastic shell 7, the lower part of the chock 2 is provided with a rib 21 which is inserted into the epoxy pouring sealant 11 and can be a rib, a rib column or an annular rib plate, and the rib 21 and the cured epoxy pouring sealant 11 are integrated.
In some embodiments, when the plastic housing 7 contains the kovar disk 3, the kovar disk 3 divides the inside of the plastic housing 7 into an upper portion containing the epoxy potting adhesive 11 and a bottom portion having a cavity, the upper portion of which is filled with a polyurethane 5 layer. By adopting the arrangement mode, the structure of the leading-out cable 9 can be sealed by adopting the epoxy pouring sealant 11, so that oil leakage into the plastic shell 7 from the position is avoided, and the effect of oil sealing is improved.
According to another aspect of the present application, there is provided a photomultiplier tube 1 including:
a photomultiplier tube body;
the kovar plate 3 is positioned at one end of the photomultiplier tube body;
the oil-proof packaging structure of the photomultiplier tube 1 as described above accommodates the kovar plate 3 and a part of the photomultiplier tube body therein.
In some embodiments, the photomultiplier tube further comprises a voltage divider 4 for connecting a cable 9, and the voltage divider 4 is located within the plastic housing 7. By the arrangement mode, the voltage divider can be isolated from the outside through the oil-proof packaging structure, and the reduction of the working stability of the voltage divider caused by the contact of the voltage divider and oil is avoided.
According to another aspect of the present application, there is provided an oil-proof encapsulation method of a photomultiplier tube 1, the oil-proof encapsulation method including:
the cable 9 of the photomultiplier 1 penetrates out of the side wall of the lower part of the plastic shell 7, and the Kovar disc 3 of the photomultiplier 1 is fixed in the plastic shell 7;
pouring liquid epoxy pouring sealant 11 above the Kovar disc 3, and curing;
the cable 9 penetrates out of an interface gap of the plastic shell 7, and liquid polyurethane 5 glue is poured into the plastic shell 7 below the Kovar disc 3; integrally inverting the photomultiplier tube 1 and the plastic shell 7, and curing the polyurethane 5 glue;
a cable joint 8 which is hermetically connected with the interface is sleeved on the cable 9; a cable leading-out pipe 10 is sleeved on the interface outer cable 9, one end of the cable leading-out pipe 10 is fixed on the cable connector 8, epoxy pouring sealant 11 is filled in the cable leading-out pipe 10 in a pouring mode, and the other end of the cable leading-out pipe 10 is connected with the other cable connector 8 in a sealing mode.
The present application will be described in detail below with reference to the oil-proof packaging structure of the eight-inch photomultiplier tube 1 shown in fig. 1.
The oil-proof packaging structure of the photomultiplier tube 1 includes: the ABS plastic shell 7 with the bottom straight cylinder structure and the convex diameter-changing upper part and the lower part, the plug block 2, the cable leading-out pipe 10 and the cable joint 8 form a complete oil-proof packaging structure. The bottom of the photomultiplier 1 is inserted into the ABS plastic shell 7 through the Kovar disk 3, an annular groove is designed on the step surface of the ABS plastic shell 7, and the Kovar disk 3 and the ABS plastic shell 7 are tightly bonded into a whole by epoxy glue in the annular groove. The ABS plastic housing 7 is now divided into two parts: a groove at the upper part and a cavity at the lower part; the upper groove is filled with epoxy pouring sealant 11, and the upper surface is covered with a plug block 2; the pouring sealant serves as a sealing path and connects the chock 2 and the ABS plastic shell 7 into a unified whole. The epoxy glue is required to be compatible with oil and to have a very low radioactivity background.
The lower chamber is provided with a voltage divider 4 and a connected cable 9, and polyurethane 5 is used for sealing; the polyurethane 5 is also required to be compatible with oil and to have a very low radioactivity background. The polyurethane 5 is poured into the side hole of the plastic shell 7 before the cable joint 8 is installed, and a certain amount is controlled; the side hole is a hole through which the cable 9 passes out of the housing, and the cable 9 is in clearance fit with the side hole. Then the photomultiplier tube 1 is inverted, so that an air cavity is left at the bottom of the ABS plastic shell 7 after the polyurethane 5 is cured, and the adverse effect caused by thermal expansion and cold contraction is prevented. The led-out cable 9 is sealed, the cable lead-out pipe 10 is connected to the plastic shell 7 through the cable connector 8, the cable connector 8 is connected to the other port of the cable lead-out pipe 10, and the cable lead-out pipe 10 is filled with the epoxy pouring sealant 11 in a combined mode, so that reliable sealing is guaranteed.
The oil-proof packaging method of the photomultiplier tube 1 comprises the following operation steps:
1. welding the cable 9 to the voltage divider 4;
2. welding the voltage divider 4 to a guide pin of a Kovar disc 3 of the photomultiplier 1;
3. the plastic shell 7 is bonded with the photomultiplier 1 by epoxy glue, and the cable 9 is led out through a side hole of the plastic shell 7;
4. encapsulating an epoxy pouring sealant 11 on the Kovar disc 3, covering the chock block 2 in place, and waiting for epoxy curing;
5. pouring polyurethane 5 glue from a side hole of the plastic shell 7, and installing a cable joint 8; inverting the photomultiplier tube 1, and waiting for the polyurethane 5 to cure;
6. installing a cable leading-out pipe 10;
7. and encapsulating epoxy pouring sealant 11 into the cable leading-out pipe 10, and installing the cable joint 8.
The photomultiplier 1 product of this application does not contact with oil completely, has just so reduced the requirement to 5 performances of polyurethane, can greatly reduced cost. All the packaging materials adopt ultra-low background, and are suitable for physical experiments with high requirement on the background; the whole process is simple, and can be completed only by simple steps.
It is easily understood by those skilled in the art that the above embodiments can be freely combined and superimposed without conflict.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.
Claims (4)
1. The oil-proof packaging method of the photomultiplier is characterized in that an oil-proof packaging structure is adopted for oil-proof packaging of the photomultiplier, the photomultiplier (1) comprises a Kovar disc (3), and the oil-proof packaging structure comprises:
the plastic shell (7) is groove-shaped, the wall of the groove is provided with an interface for leading out a cable (9), and the interface is connected with a cable joint (8) in a sealing way; the plastic shell (7) is used for accommodating the kovar disc (3); the plastic shell (7) is filled with epoxy pouring sealant (11) which is used for contacting the outer wall of the photomultiplier (1) and fixing the Kovar disc (3);
one end of the cable outlet pipe (10) is arranged on the outer wall of the plastic shell (7) at the interface, and the cable outlet pipe (10) is sleeved on the cable (9) led out from the interface; the cable leading-out pipe (10) is filled with epoxy pouring sealant (11);
the groove of the plastic casing (7) comprises an upper first wall body and a lower second wall body, the inner diameter of the first wall body is larger than that of the second wall body, and a step is formed between the first wall body and the second wall body; the steps are used for erecting the kovar disc (3);
the oil-proof packaging structure further comprises a plug block (2), the plug block (2) is in an annular plate shape, and the plug block (2) is used for sleeving the photomultiplier (1) and covers the upper end of the first wall body;
the chock (2) is provided with a rib (21) inserted into the epoxy pouring sealant (11) positioned in the plastic shell (7);
the oil-proof packaging method comprises the following steps:
a cable (9) of the photomultiplier (1) penetrates through the side wall of the lower part of the plastic shell (7), and a Kovar disc (3) of the photomultiplier (1) is fixed in the plastic shell (7);
pouring liquid epoxy pouring sealant (11) above the kovar plate (3) and curing;
the cable (9) penetrates through an interface gap of the plastic shell (7), and liquid polyurethane (5) glue is poured into the plastic shell (7) below the Kovar disc (3); integrally inverting the photomultiplier (1) and the plastic shell (7) until the polyurethane (5) glue is cured;
a cable joint (8) which is hermetically connected with the interface is sleeved on the cable (9); a cable leading-out pipe (10) is sleeved on the interface outer cable (9), one end of the cable leading-out pipe (10) is fixed on the cable connector (8), epoxy pouring sealant (11) is filled and sealed in the cable leading-out pipe (10), and then the other cable connector (8) is connected to the other end of the cable leading-out pipe (10) in a sealing mode.
2. The method for oil-proofing encapsulation of a photomultiplier according to claim 1, characterized in that the other end of the cable exit tube (10) is hermetically connected with a cable joint (8).
3. The method for oil-proofing packaging of photomultiplier according to claim 1, characterized in that the step is provided with an annular groove (31), the annular groove (31) being filled with an adhesive material for bonding the kovar disc (3) and the plastic housing (7) together.
4. The method for oil-proofing encapsulation of a photomultiplier according to claim 1, characterized in that when the plastic housing (7) houses the kovar tray (3), the kovar tray (3) divides the inside of the plastic housing (7) into an upper portion housing the epoxy potting adhesive (11) and a bottom portion having a cavity, the upper portion of which is filled with a layer of polyurethane (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010958859.9A CN111968906B (en) | 2020-09-14 | 2020-09-14 | Oil-proof packaging structure of photomultiplier, photomultiplier and oil-proof packaging method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010958859.9A CN111968906B (en) | 2020-09-14 | 2020-09-14 | Oil-proof packaging structure of photomultiplier, photomultiplier and oil-proof packaging method |
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| CN111968906A CN111968906A (en) | 2020-11-20 |
| CN111968906B true CN111968906B (en) | 2021-07-06 |
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| CN202010958859.9A Active CN111968906B (en) | 2020-09-14 | 2020-09-14 | Oil-proof packaging structure of photomultiplier, photomultiplier and oil-proof packaging method |
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| CN113555271B (en) * | 2021-05-21 | 2024-04-19 | 闫琪明 | Sealing waterproof device for photomultiplier |
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| CN212570922U (en) * | 2020-09-14 | 2021-02-19 | 中国科学院高能物理研究所 | Oil-proof packaging structure of photomultiplier and photomultiplier |
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| US20150234057A1 (en) * | 2012-09-21 | 2015-08-20 | Johnson Matthey Public Limited Company | Photomultiplier apparatus and radiation detector incorporating such apparatus |
| CN106783501A (en) * | 2016-12-21 | 2017-05-31 | 中国科学院高能物理研究所 | A kind of large scale photomultiplier waterproof encapsulation structure and method for packing |
| CN110211862A (en) * | 2019-06-12 | 2019-09-06 | 中国科学院高能物理研究所 | The waterproof enclosure and manufacture craft of small size photomultiplier tube |
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