Leakage detection clamp for anode assembly of photoelectric detector

Abstract

The utility model relates to the technical field of leak detection clamps, in particular to a leak detection clamp for an anode assembly of a photoelectric detector, which comprises a fixed frame, a compression adjusting assembly which applies pressure downwards is arranged at the center of the top of the fixed frame, and a detection adapter ring which is fixedly connected with an air source nozzle is arranged at the center of the bottom of the inner side of the fixed frame. The device has the advantages that the device is formed by combining a plurality of parts, the parts are easy to replace and maintain, the structural design is simple, and operation is easy; a to-be-detected product is easy to install during leak detection, the to-be-detected product is placed on the inner wall of the circular support, too precise position correction is not needed, and the situation that gas leakage cannot be detected due to dislocation of a tube shell and an extraction opening of the leak detector is avoided; meanwhile, the pressure can be manually adjusted at any time through the upper pressing adjusting assembly, it is ensured that the tube shell, the fluorescent screen and the leak detector can be tightly attached during leak detection, rapid air exhaust is achieved under the condition of good sealing, accurate leak detection is carried out, and the leak detection efficiency of the tube shell and the fluorescent screen is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a leak detection fixture for the anode assembly of a photoelectric detector. BACKGROUND

[0002] Micro-light image intensifier is the core component of micro-light night vision system. The third generation micro-light image intensifier is a vacuum type photoelectric detection imaging device, which is composed of an image intensifier tube, a power supply and a shell. The image intensifier tube is composed of a photocathode, a micro-channel plate, a fluorescent screen and a tube shell. We usually call the photocathode a cathode assembly, and the fluorescent screen and the tube shell are collectively referred to as an anode assembly.

[0003] According to statistics, the service life of the micro-light image intensifier is generally about 3000h, and the storage life can exceed 5000h. However, in actual process production, the service life and storage life of some finished devices cannot reach the above-mentioned numbers. Vacuum deterioration is one of the main reasons for the failure of the micro-light image intensifier. The third generation micro-light image intensifier is a kind of vacuum device, which requires that the internal vacuum degree is better than 1x10 -10 torr, which means that the image tube should be prepared in an ultra-high vacuum environment of <1x10 -10 torr. Therefore, in order to maintain the internal vacuum, the leak rate is required to be very high. Once the vacuum device leaks, it will fail. If the internal vacuum of the third generation micro-light image intensifier is too low, the performance of the photocathode will be rapidly degraded, resulting in the failure of the whole device.

[0004] There are three factors for the deterioration of the internal vacuum degree: ① the diffusion of the gas dissolved in the material causes the decrease of the internal vacuum degree; ② the extremely small leak hole causes the decrease of the internal vacuum degree; and ③ the penetration of external gas causes the decrease of the internal vacuum degree.

[0005] The tube shell in the anode assembly plays a crucial role in the third generation micro-light image intensifier. As the main support structure, it is used to protect and support the input screen, the output screen and the electrodes in the tube, and to maintain the vacuum degree in the tube to ensure that the electrons move freely in the tube without being disturbed by gas molecules. According to the structural characteristics of the micro-light image intensifier, the main causes of the decrease of the internal vacuum degree are the outgassing of the gas dissolved in the material and the extremely small leak hole in the sealing end surface between the tube shell and the fluorescent screen.

[0006] Therefore, in order to ensure that the internal vacuum degree of the third generation micro-light image intensifier reaches the requirement, the leak rate of the related components of the third generation micro-light image intensifier must be detected before preparation, and the main detection object is the anode assembly composed of a tube shell and a fluorescent screen; currently, the leak detection is performed by using an Agilent leak detector, but the current leak detection clamp exerts insufficient pressure, which leads to incomplete sealing and the pumping cannot reach the leak detection standard, and thus false judgment is easily made; the insufficient pressure leads to incomplete sealing, and when helium is blown, a large fluctuation occurs, which leads to the judgment of leakage, and the insufficient pressure leads to incomplete sealing, and when pumping, the product can be completely sealed only by exerting pressure through atmospheric pressure after vacuumizing, and then the leak detection standard can be reached, thereby affecting the detection efficiency. Practical new type content

[0007] The utility model discloses at least one of the technical defects.

[0008] Therefore, one purpose of the utility model is to provide a leak detection clamp for a photodetector anode assembly to solve the problems mentioned in the background art and overcome the deficiencies in the prior art.

[0009] In order to achieve the above-mentioned purpose, an embodiment of the utility model provides a leak detection clamp for a photodetector anode assembly, which comprises a fixed frame, a pressure adjustment assembly for exerting downward pressure is arranged at the center of the top of the fixed frame, a detection adapter ring fixedly connected with a gas source nozzle is arranged at the center of the bottom of the inner side of the fixed frame, a product to be detected is placed on the inner wall bottom surface of the detection adapter ring, a gland is buckled to the middle of the outer wall of the product to be detected, a pressure cover plate movably connected to the top of the gland is arranged, the lifting end of the pressure adjustment assembly is tightly pressed at the center of the top surface of the pressure cover plate, the pressure cover plate is tightly pressed to the top surface of the gland, a connecting bolt is inserted into the center of the bottom of the both sides of the fixed frame, and the connecting bolt penetrates the inner wall of the fixed frame.

[0010] According to any one of the above-mentioned schemes, preferably, the fixed frame is a U-shaped frame mechanism, and the detection adapter ring is arranged at the center of the inner wall bottom of the U-shaped frame mechanism.

[0011] The technical effect achieved by the above-mentioned scheme is that the frame structure can support the pressure adjustment assembly and provide an adjustment and pressure tightening space.

[0012] According to any one of the above-mentioned schemes, preferably, the pressure adjustment assembly comprises a screw rod threadedly connected with the center of the top of the fixed frame, a rotating handle fixedly connected to the top of the screw rod, a pressure holding head fixedly connected to the bottom end of the screw rod, the bottom of the pressure holding head is a spherical surface structure, and the length of the screw rod is greater than the distance between the top of the detection adapter ring and the top of the fixed frame.

[0013] The technical effect achieved by the above-mentioned scheme is that the rotating handle can be used to rotate the screw rod, and the length of the screw rod can effectively press the product to be detected.

[0014] Preferably, according to any one of the above solutions, the pressing cover plate comprises a circular plate, a circular hole is formed in the center of the top surface of the circular plate, and the pressing head is pressed into the interior of the circular hole.

[0015] The above solution achieves the technical effect of improving the smoothness of rotation by the butt joint of the circular hole and the pressing head.

[0016] Preferably, according to any one of the above solutions, the pressing cover is a cylindrical structure with a blind hole, the circular plate is made of a magnetic material, and the circular plate can be attracted to the pressing head and the pressing cover.

[0017] The above solution achieves the technical effect of facilitating the lifting of the pressing cover by the magnetic pressing cover, so that the circular plate and the pressing cover top surface are stably aligned, and the blind hole cylindrical structure forms a concave structure, so that the pressing force is uniformly dispersed to the edge of the product to be detected, and the protection effect of the fluorescent screen of the product to be detected is achieved.

[0018] Preferably, according to any one of the above solutions, the detection adapter ring comprises a circular support bracket, the top end of the circular support bracket is in the shape of a counterbore and is positioned and matched with the product to be detected, a KF interface is fixedly connected to the center of the bottom surface of the circular support bracket, a through hole is formed in the center of the circular support bracket and is communicated with the KF interface, and notches are formed on both sides of the circular support bracket.

[0019] The above solution achieves the technical effect of facilitating the connection and fixation of the KF interface with the origin interface of the detection equipment, so as to connect the origin, and facilitating the pinching of the product to be detected through the notches, so as to take and place the product to be detected.

[0020] Compared with the prior art, the utility model has the advantages and beneficial effects that:

[0021] The leak detection clamp for the anode assembly of the photoelectric detector is composed of multiple parts, the parts are easy to replace and maintain, the structure design is simple, and the clamp is easy to operate; the product to be detected is easy to install during leak detection, and the product to be detected can be placed in the inner wall of the circular support bracket, without the need for too precise position correction, so as to avoid the misalignment of the pipe shell and the air outlet of the leak detector, thereby preventing gas leakage and detection; meanwhile, the upper pressing and adjusting assembly can manually adjust the pressure at any time, so as to ensure that the pipe shell, the fluorescent screen and the leak detector can be closely combined during leak detection, so as to realize rapid air extraction under good sealing condition and accurate leak detection, and greatly improve the leak detection efficiency of the pipe shell and the fluorescent screen. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 The utility model is an explosion structure schematic diagram;

[0023] Fig. 2The utility model discloses a combined structure schematic view.

[0024] Fig. 3 The utility model discloses an internal structure schematic view.

[0025] Fig. 4 The utility model discloses the structure schematic view of detecting adapter ring.

[0026] In the drawing: 1 - compression adjusting assembly, 101 - screw rod, 102 - hold head, 103 - rotating handle, 2 - compression cover plate, 201 - round plate, 202 - round hole, 3 - compression cover, 4 - fixed frame, 5 - connecting bolt, 6 - product to be detected, 7 - detection adapter ring, 701 - round support, 702 - KF interface, 703 - slot. DETAILED DESCRIPTION

[0027] The utility model will be further described below in combination with the drawings, but the protection scope of the utility model is not limited to the following.

[0028] Example one: as Figs. 1 to 4 The utility model discloses a leak hunting clamp for photodetector anode assembly, it includes the fixed frame 4, the fixed frame 4 top center place is provided with the compression adjusting assembly 1 of the pressure that goes down is added, the fixed frame 4 inside bottom center place is provided with the detection adapter ring 7 that is connected fixed with gas source mouth, the detection adapter ring 7 inner wall bottom surface places have the product to be detected 6, the product to be detected 6 outer wall middle part has the compression cover 3 of buckling, the compression cover 3's top movable joint has the compression cover plate 2, the compression adjusting assembly 1's lifting end is compressed to the center place of compression cover plate 2 top surface, the compression cover plate 2 is compressed tightly to the top surface of compression cover 3, the fixed frame 4 both sides bottom center place all have the connecting bolt 5 of inserting, and the connecting bolt 5 is through fixed frame 4 inner wall.

[0029] As an optional technical scheme of the utility model, the fixed frame 4 is a U-shaped frame mechanism, the detection adapter ring 7 is at the center of the inner wall bottom of the U-shaped frame mechanism, the frame structure is convenient for supporting the compression adjusting assembly 1, and provides an adjusting compression space.

[0030] As an optional technical scheme of the utility model, the compression adjusting assembly 1 includes the screw rod 101 of the screw thread connection with the top center of fixed frame 4, the top fixed connection of screw rod 101 has rotating handle 103, the bottom fixed connection of screw rod 101 has hold head 102, the bottom of hold head 102 is spherical structure, and the length of screw rod 101 is greater than the distance between the top of detection adapter ring 7 and the top of fixed frame 4, which is convenient for rotating screw rod 101 by rotating handle 103, and the product to be detected 6 can be effectively compressed by the length of screw rod 101.

[0031] As an optional technical scheme of the utility model, the pressing cover plate 2 includes a circular plate 201, a circular hole 202 is formed in the center of the top surface of the circular plate 201, the pressing head 102 corresponds to the position of the circular hole 202, the pressing head 102 is pressed into the interior of the circular hole 202, and the circular hole 202 and the pressing head 102 are pressed and connected in an end-to-end manner, so that the smoothness of rotation is improved.

[0032] As an optional technical scheme of the utility model, the pressing cover plate 2 includes a circular plate 201, a circular hole 202 is formed in the center of the top surface of the circular plate 201, the pressing head 102 corresponds to the position of the circular hole 202, the pressing head 102 is pressed into the interior of the circular hole 202, and the circular hole 202 and the pressing head 102 are pressed and connected in an end-to-end manner, so that the smoothness of rotation is improved.

[0033] As an optional technical scheme of the utility model, the pressing cover plate 2 includes a circular plate 201, a circular hole 202 is formed in the center of the top surface of the circular plate 201, the pressing head 102 corresponds to the position of the circular hole 202, the pressing head 102 is pressed into the interior of the circular hole 202, and the circular hole 202 and the pressing head 102 are pressed and connected in an end-to-end manner, so that the smoothness of rotation is improved.

[0034] A leak detection clamp for a photodetector anode assembly has the following working principle:

[0035] 1) The product to be detected 6 is placed on the inner wall of the circular support 701;

[0036] 2) Then the pressing cover 3 is buckled to the outer wall of the product to be detected 6, and then the pressing cover plate 2 is pressed to the top surface of the pressing cover 3;

[0037] 3) Then rotate the screw rod 101, so that the pressing head 102 is pressed into the inner wall of the circular hole 202 on the top surface of the pressing cover plate 2, and as the pressing continues, the bottom of the product to be detected 6 is tightly sealed with the inner wall of the circular support 701;

[0038] 4) The detection equipment supplies gas, and the KF interface 702 is used to supply gas to the inner wall of the circular support 701, so as to perform detection.

[0039] In summary, the leak detection clamp for the anode assembly of a photodetector is composed of multiple parts, the parts are easy to replace and maintain, the structure is simple and easy to operate; the product 6 to be detected is easy to install when leak detection, the product 6 to be detected is placed in the inner wall of the circular support 701, no need for too precise position correction, avoid the misalignment of the pipe shell and the leak detector suction port, resulting in gas leakage cannot be detected; at the same time, the upper pressing adjusting assembly 1 can be manually adjusted at any time, ensure that the pipe shell, the fluorescent screen and the leak detector can be closely combined during leak detection, realize fast air extraction under the condition of good sealing, and accurate leak detection, greatly improve the leak detection efficiency of the pipe shell and the fluorescent screen.

[0040] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and the ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model without departing from the principles and purposes of the utility model. The scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A leak detection fixture for a photodetector anode assembly, characterized by: The utility model provides a product detection device, including fixed frame (4), fixed frame (4) top center place is provided with the pressure of the downward application pressure -tight adjusting assembly (1), the inside bottom center of fixed frame (4) is provided with the detection adapter ring (7) fixed connection with gas source mouth, the inside wall bottom surface of detection adapter ring (7) places the product (6) to be detected, the outer wall middle part of product (6) to be detected is buckled with gland (3), the top of gland (3) is movably connected with pressure -tight cover plate (2), the lifting end of pressure -tight adjusting assembly (1) is pressed to the center of pressure -tight cover plate (2) top surface, pressure -tight cover plate (2) is pressed tightly to the top surface of gland (3), the bottom center of both sides of fixed frame (4) is inserted with connecting bolt (5) equally, connecting bolt (5) penetrates fixed frame (4) inner wall.

2. A leak detection fixture for a photodetector anode assembly according to claim 1, wherein: The fixed frame (4) is a U-shaped frame mechanism, and the detection adapter ring (7) is located at the center of the bottom inner wall of the U-shaped frame mechanism.

3. A leak detection fixture for a photodetector anode assembly according to claim 2, wherein: The pressure -tight adjusting assembly (1) includes a screw rod (101) threadedly connected to the top center of the fixed frame (4), a rotating handle (103) fixedly connected to the top of the screw rod (101), and a pressure -holding head (102) fixedly connected to the bottom end of the screw rod (101).

4. A leak detection fixture for a photodetector anode assembly according to claim 3, wherein: The pressure -tight cover plate (2) includes a circular plate (201) having a circular hole (202) formed in the center of the top surface thereof, and the pressure -holding head (102) is located corresponding to the circular hole (202), and the pressure -holding head (102) is pressed into the inside of the circular hole (202).

5. A leak detection fixture for a photodetector anode assembly according to claim 4, wherein: The gland (3) is a cylindrical structure with a blind hole, the circular plate (201) is made of a magnet material, and the circular plate (201) can be attracted to the pressure -holding head (102) and the gland (3).

6. A leak detection fixture for a photodetector anode assembly according to claim 5, wherein: The detection adapter ring (7) includes a circular support bracket (701) having a counterbore shape at the top end thereof for positioning and matching with the product (6) to be detected, a KF interface (702) fixedly connected to the center of the bottom surface of the circular support bracket (701), a through hole formed in the center of the circular support bracket (701) and communicating with the KF interface (702), and notches (703) formed in both sides of the circular support bracket (701).

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