CN110211862B - Waterproof packaging and manufacturing process of small-size photomultiplier - Google Patents
Waterproof packaging and manufacturing process of small-size photomultiplier Download PDFInfo
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- CN110211862B CN110211862B CN201910507467.8A CN201910507467A CN110211862B CN 110211862 B CN110211862 B CN 110211862B CN 201910507467 A CN201910507467 A CN 201910507467A CN 110211862 B CN110211862 B CN 110211862B
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- photomultiplier
- small
- cable
- shell
- pouring sealant
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J43/00—Secondary-emission tubes; Electron-multiplier tubes
- H01J43/02—Tubes in which one or a few electrodes are secondary-electron emitting electrodes
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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
- 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
Abstract
The invention discloses a waterproof package of a small-size photomultiplier, which comprises a shell and a pouring sealant, wherein the shell comprises an annular groove and a cable leading-out pipe, the cable leading-out pipe extends into the annular groove along the axial part of the annular groove, the bottom end of the small-size photomultiplier is inserted into the shell, and the peripheral wall of the inserted part is in sealed connection with the inner wall of the shell; and the cavity part formed by the bottom end of the small-size photomultiplier and the inside of the shell is filled with the pouring sealant. The invention is provided with the shell for accommodating the lower part of the small-size photomultiplier, the pouring sealant is filled in the shell, and the sealing layer is coated outside the shell to buffer the direct action on the small-size photomultiplier, thereby prolonging the service life, simultaneously having good waterproof and isolating effects and stable structure, and ensuring the product performance to be stable.
Description
Technical Field
The invention relates to the technical field of packaging of photomultiplier tubes, in particular to a waterproof packaging method of a small-size photomultiplier tube and a manufacturing process thereof.
Background
Photomultiplier tubes are vacuum electronic devices that convert weak optical signals into electrical signals. Photomultiplier tubes are used in optical measuring instruments and spectroscopic analyzers. The stability of the photomultiplier is determined by various factors such as the characteristics of the device itself, the operating conditions, and the environmental conditions. The output of the tube is unstable in the working process, and the tube mainly has the phenomenon of unstable jumping caused by poor welding of the electrode in the tube, loose structure, poor contact of a cathode elastic sheet, discharge of an interelectrode tip, flashover and the like, and the signal is small and large.
The conventional photomultiplier tube seal has the following drawbacks: 1. single-layer sealing is adopted, and the failure rate is high; 2. the glue filling shell is simple in design and can only be filled with glue through the leading-out opening, the mode is difficult to exhaust, bubbles exist in the cavity easily, and the positions of the bubbles are not controllable. 3. There is no reliable way of sealing cables whose outer skin is a difficult-to-bond material (e.g., HDPE, PTFE, etc.). In order to ensure the sealing reliability, the signal leading-out cable sheath can only be made of materials which are easy to bond, such as PVC (polyvinyl chloride) PU (polyurethane), and the like, and cannot be used in experiments with high compatibility requirements.
Disclosure of Invention
The invention provides a small-size photomultiplier waterproof package, which enables the photomultiplier to have a good packaging effect and stable performance.
In order to achieve the above object, the present invention provides the following technical solutions: the waterproof packaging structure comprises a shell and a pouring sealant, wherein the shell comprises an annular groove and a cable leading-out pipe, the cable leading-out pipe extends into the annular groove along the axial part of the annular groove, the bottom end of the small-size photomultiplier is inserted into the shell, and the peripheral wall of the inserted part is in sealing connection with the inner wall of the shell; and the cavity part formed by the bottom end of the small-size photomultiplier and the inside of the shell is filled with the pouring sealant.
Preferably, the waterproof package further comprises a sealing layer, and the sealing layer covers a part of the housing, a part of the small-sized photomultiplier and a joint of the two.
Preferably, the sealing layer includes waterproof layer and isolation layer, the isolation layer cladding is in outside the waterproof layer.
Preferably, the isolation layer is a heat-shrinkable tube layer.
Preferably, the cable outlet pipe close to the annular groove is internally filled with a sealant.
Preferably, the cable outlet pipe far away from the annular groove is externally coated with an injection molding sealing element.
Preferably, the pouring sealant is filled between the port of the cable leading-out tube and the bottom end of the small-size photomultiplier tube.
In order to achieve the above object, the present invention provides another technical solution: a manufacturing process of the waterproof package of the small-size photomultiplier comprises the following steps:
⑴ the outer end of the cable penetrates out of the cable outlet pipe, and pouring sealant from the upper end of the cable outlet pipe to seal the cable;
⑵ placing the opening of the shell upward in a vertical position, and pouring a proper amount of pouring sealant into the shell;
⑶ the whole structure after turning and tight fitting is in an inverted position, so that the pouring sealant flows to the bottom end of the photomultiplier tube, and the air chamber is formed by the deficient pouring sealant when the cable outlet tube is inserted into the pouring cavity;
⑷ A sealing tape is wrapped on the cylindrical outer side formed by the photomultiplier and the housing, and a heat-shrinkable tube is sleeved on the cylindrical outer side, and then the cylindrical outer side is heat-shrunk by a heat gun and tightly fixed.
Preferably, in step ⑴, an injection molding sealing process is performed between the cable exit end and the housing.
Preferably, step ⑵, the inner wall of the housing is provided with a step for resting the bottom of the photomultiplier tube, and the outer peripheral wall of the photomultiplier tube is tightly fitted with the step.
Compared with the prior art, the invention has the following advantages: the arrangement of the shell for accommodating the lower part of the small-size photomultiplier below 5 inches is filled with pouring sealant, the sealing layer is coated outside, the direct action of the buffer on the small-size photomultiplier is buffered, the service life is prolonged, and meanwhile, the waterproof and isolation effects are good, the structure is stable, and the product performance is stable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 diagram of a waterproof package for a small-sized photomultiplier according to the present invention;
graphic notation:
1-1, an annular groove; 1-2, a lead outlet pipe; 1-3, a drainage groove; 2-1, pouring sealant; 2-2, pouring sealant; 3. an air chamber; 4-1, butyl rubber; 4-2, heat-shrinkable tubing; 5. injection molding a sealing element; 6. a pin; 7. a circuit board; 8. a cable; 9. a small-sized photomultiplier tube.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment 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, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination 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 small-sized photomultiplier 9 comprises a housing and a pouring sealant, wherein the housing comprises an annular groove 1-1 and a cable 8 leading-out pipe, the cable 8 leading-out pipe extends into the annular groove 1-1 along the axial portion of the annular groove 1-1, the bottom end of the small-sized photomultiplier 9 is inserted into the housing, and the peripheral wall of the inserted portion is hermetically connected with the inner wall of the housing; and a cavity part formed by the bottom end of the small-size photomultiplier 9 and the inside of the shell is filled with the pouring sealant 2-1.
The small-size photomultiplier 9 is erected in the upper part of the shell, the pouring sealant 2-1 is filled in the shell, and the small-size photomultiplier 9 and the shell are sealed to ensure the stability and the waterproofness between the small-size photomultiplier 9 and the shell. In particular, the pouring sealant 2-1 is filled near the bottom end of the small-sized photomultiplier 9.
The leading-out pipe part of the cable 8 extends into the annular groove 1-1, so that a lead is conveniently led out, an air chamber 3 is conveniently formed in the shell, the space for thermal expansion and cold contraction of the pouring sealant 2-1 is ensured, and the sealant coated around the circuit board 7 is free from air bubbles.
The waterproof package also comprises a sealing layer which covers part of the shell, part of the small-size photomultiplier 9 and the joint of the small-size photomultiplier and the small-size photomultiplier, namely the waterproof package is sleeved near the joint of the shell and the small-size photomultiplier 9, and the waterproof sealing performance of the waterproof package is further improved.
The sealing layer comprises a waterproof layer and an isolating layer, the isolating layer is coated outside the waterproof layer, and the waterproof layer is directly contacted with the position near the joint of the shell and the small-size photomultiplier 9; wherein the isolation layer is a heat-shrinkable tube layer.
A circuit board 7 connected with the small-size photomultiplier 9 is embedded in the pouring sealant 2-1. The circuit board 7 is directly fixed on the bottom end face of the small-sized photomultiplier 9, a lead is led out from the circuit board 7, and the lead is led out of the packaging structure through a cable 8 leading-out pipe.
In order to improve the waterproof sealing performance of the lead in the lead-out pipe of the cable 8, sealant is filled in the lead-out pipe of the cable 8 close to the annular groove 1-1, namely the sealant is filled between the outer wall of the lead and the inner wall of the lead-out pipe of the cable 8, so that the waterproof performance is enhanced. And particularly, the outer side of the cable 8 outlet pipe far away from the annular groove 1-1 is coated with an injection molding sealing piece 5, so that the waterproof sealing performance of the product is enhanced.
Wherein the sealant is HDPE potting sealant 2-2. The shell is made of ABS material.
For the interior of the shell, pouring sealant 2-2 is filled between the port of the cable 8 leading-out pipe and the bottom end of the small-size photomultiplier 9, and the air chamber 3 is of an annular groove structure around the part, extending into the cable 8 leading-out pipe.
The manufacturing method of the waterproof package comprises the following steps:
1. penetrating the cable 8 through a cable 8 eduction tube, performing low-pressure injection molding on a low-pressure injection molding machine, and then injecting 2-2 parts of pouring sealant from the upper end of the eduction tube to finish the sealing of the cable 8;
2. welding a cable 8 to a circuit board 7, and then welding the circuit board 7 to the pin 6, so that the photomultiplier is started to work after working voltage is applied, and the obtained electric signal is transmitted to electronics through a voltage divider and the cable 8;
3. the shell is in a vertical position, and a proper amount of pouring sealant 2-1 is injected into the shell;
4. when the photomultiplier is in a positive standing state, the bottom end of the photomultiplier is inserted into the shell, the peripheral wall of the inserted part is tightly matched with the step of the inner wall of the shell, and an adhesive tape is wound on the outer side of the contact surface;
5. the whole structure is turned over to be in an inverted position, so that the pouring sealant 2-1 flows to the bottom end of the photomultiplier along the drainage groove 1-3, and the deficient pouring sealant 2-1 enables the cable 8 leading-out pipe to be inserted into the periphery of the pouring sealant cavity to form an air chamber 3;
6. and (3) coating a sealing adhesive tape on the cylindrical outer side formed by the photomultiplier and the shell, sleeving a heat-shrinkable tube on the cylindrical outer side, and performing heat shrinkage by using a hot air gun to tightly fix the cylindrical outer side.
The invention has the following advantages:
1. the reliability is improved due to double sealing;
2. the special designs of drainage grooves 1-3, an air chamber 3 and the like are arranged in the shell, so that the glue filling mode is changed into a large-opening glue inlet mode, and then the mode of handstand is adopted, so that all gas in the curing process of the glue is in the air chamber 3, and the device needing to be protected is guaranteed to be tightly wrapped by the glue.
3. The cable 8 is sealed by adopting the double sealing mode of inner-layer HDPE special epoxy sealing and outer-layer low-pressure injection sealing, so that the sealing reliability of the HDPE cable 8 is ensured.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various 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 (7)
1. A waterproof packaging of a small-sized photomultiplier (9), characterized in that: the small-size photomultiplier comprises a shell and pouring sealant, wherein the shell comprises an annular groove (1-1) and a cable (8) leading-out pipe, the cable (8) leading-out pipe extends into the annular groove (1-1) along the axial part of the annular groove (1-1), the bottom end of the small-size photomultiplier (9) is inserted into the shell, and the peripheral wall of the inserted part is in sealing connection with the inner wall of the shell; the cavity part formed by the bottom end of the small-size photomultiplier (9) and the inside of the shell is filled with the pouring sealant, and the pouring sealant is filled between the port of the cable (8) leading-out tube and the bottom end of the small-size photomultiplier (9); sealant is filled in the cable (8) leading-out pipe close to the annular groove (1-1), and an injection molding sealing piece (5) is coated outside the cable (8) leading-out pipe far away from the annular groove (1-1).
2. Waterproof packaging for small-sized photomultiplier tubes (9) according to claim 1, characterized in that: the waterproof package further comprises a sealing layer which covers part of the housing, part of the small-sized photomultiplier (9) and the joint of the two.
3. Waterproof packaging for small-sized photomultiplier tubes (9) according to claim 2, characterized in that: the sealing layer includes waterproof layer and isolation layer, the isolation layer cladding is in outside the waterproof layer.
4. Waterproof packaging for small-sized photomultiplier tubes (9) according to claim 3, characterized in that: the isolation layer is a heat-shrinkable tube layer.
5. A process for the production of a waterproof encapsulation of a small-sized photomultiplier (9) according to any of claims 1 to 4, characterized in that: the method comprises the following steps:
⑴ the outer end of the cable (8) penetrates out of the cable (8) eduction tube, and pouring the pouring sealant (2-2) from the upper end of the cable (8) eduction tube to complete the sealing of the cable (8);
⑵ placing the casing in upright position with its opening facing upwards, and pouring a proper amount of pouring sealant (2-1) into the casing, wherein the bottom end of the photomultiplier is inserted into the casing, and the outer peripheral wall of the inserted part is tightly fitted with the inner wall of the casing;
⑶, the whole structure after being turned and tightly matched is in an inverted position, so that the pouring sealant (2-1) flows towards the bottom end of the photomultiplier, and the deficient pouring sealant (2-1) enables the cable (8) eduction tube to be inserted into the pouring sealant cavity to form an air chamber (3);
⑷ A sealing tape is wrapped on the cylindrical outer side formed by the photomultiplier and the housing, and a heat-shrinkable tube is sleeved on the cylindrical outer side, and then the cylindrical outer side is heat-shrunk by a heat gun and tightly fixed.
6. The manufacturing process according to claim 5, wherein in step ⑴, the cable (8) is injection-molded and sealed between the leading end and the housing.
7. The process of claim 6, wherein step ⑵, the inner wall of the housing is provided with a step for placing the bottom of the photomultiplier tube, and the outer wall of the photomultiplier tube is tightly fitted with the step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910507467.8A CN110211862B (en) | 2019-06-12 | 2019-06-12 | Waterproof packaging and manufacturing process of small-size photomultiplier |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910507467.8A CN110211862B (en) | 2019-06-12 | 2019-06-12 | Waterproof packaging and manufacturing process of small-size photomultiplier |
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| CN110211862A CN110211862A (en) | 2019-09-06 |
| CN110211862B true CN110211862B (en) | 2020-07-17 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111564359B (en) * | 2020-05-14 | 2021-11-26 | 中国科学院高能物理研究所 | Waterproof packaging device and packaging method |
| CN111968906B (en) * | 2020-09-14 | 2021-07-06 | 中国科学院高能物理研究所 | Oil-proof packaging structure of photomultiplier, photomultiplier and oil-proof packaging method |
| CN113327835B (en) * | 2020-09-29 | 2022-05-13 | 湖南博大光电科技有限公司 | Waterproof device for photomultiplier |
| CN113555271B (en) * | 2021-05-21 | 2024-04-19 | 闫琪明 | Sealing waterproof device for photomultiplier |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101071705A (en) * | 2007-06-07 | 2007-11-14 | 中国科学院紫金山天文台 | Composite packaging method for photomultiplier tube |
| US10132938B2 (en) * | 2016-03-22 | 2018-11-20 | Ge Energy Oilfield Technology, Inc. | Integrated nuclear sensor |
| CN106783501B (en) * | 2016-12-21 | 2018-07-03 | 中国科学院高能物理研究所 | A kind of large scale photomultiplier waterproof encapsulation structure and packaging method |
| CN209947793U (en) * | 2019-06-12 | 2020-01-14 | 中国科学院高能物理研究所 | Waterproof packaging of small-sized photomultiplier |
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- 2019-06-12 CN CN201910507467.8A patent/CN110211862B/en active Active
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