CN101958156B - Transmission seal cavity with double protection - Google Patents

Abstract

The present invention is a transmissive sealed chamber with double protection, since one transmissive seal and two transmissive seals are installed on the sealed cavity body, which respectively block the contact of the external medium and the internal emitter. The transmission sealing plate has good permeability and airtightness, and will not negatively affect the penetration strength of the ray-like medium while ensuring reliable sealing. An alarm circuit board is installed in the sealed cavity. The structure of the alarm circuit is simple and compact. There are no redundant or exposed lines. All components and lines are embedded in the circuit board, which makes the alarm function of the circuit board stable and reliable.

Description

A transmissive sealed chamber with double protection

technical field

The patent of the present invention relates to a sealing device, in particular to a sealing chamber device.

Background technique

Among the sealing devices used around us at present, the most common basic form is a completely closed sealing chamber. Usually, in order to achieve a complete and reliable sealing effect, a completely enclosed space is made, and the core components that need to be protected and shielded are enclosed in the space. In the process of making the sealing chamber, the material can be selected from metal or non-metallic materials. In the case of no special requirements, the structure of the sealing chamber is relatively simple and practical, and its wall thickness is basically the same. The purpose of doing this is to reduce the difficulty of casting or machining and reduce the cost. The advantage of this type of sealing cavity is that the structure is simple, the cost is low, and the sealing effect is reliable. The disadvantage is that the sealing cavity does not have a special purpose. For example: detectors or radiation-emitting components installed inside will lose or reduce the emission detection energy due to the shielding of the wall thickness of the sealed cavity. For radioactive sources that emit radiation, the density of metal is high, and the shielding effect on radiation is very obvious, which is why most radioactive sources use metal lead as containers to achieve safe shielding. In the sealed cavity made of metal material, some rays will be completely shielded and lose their effect, and the energy of some rays will be greatly attenuated after penetrating through the wall thickness of the sealed cavity. In this case, the detection and measurement accuracy and sensitivity are greatly affected, which basically cannot meet the needs of experiments and production guidance. Another situation is that once the material is rich in hydrogen, this kind of non-metallic plastic will slow down and shield neutron rays, and hydrogen is the main component of most non-metallic plastics. Therefore, as a fully enclosed sealed cavity, metal or non-metal materials have their own adaptability and limitations.

Contents of the invention

Aiming at the defects existing in the existing sealed cavity, the patent of the present invention provides a transmissive sealed cavity with good airtightness and permeability, stable and reliable alarm function and dual protection functions.

The specific technical measures taken to solve the above technical problems are: a transmissive sealed cavity with double protection, which is characterized in that: a spigot is processed on the upper part of the sealed cavity (17), and an insulating ring (11) is disposed on the slit. ), an inner support ring (15) is built inside the insulating ring (11), an "O"-shaped sealing ring (10) is installed between the inner support ring (15) and the insulating ring (11), and the inner support ring ( 15) The top inner groove is disposed with a lower transmissive sealing film (16) of polyester material, and an "O"-shaped sealing ring (14) is installed between the lower transmissive sealing film (16) and the inner support ring (15). The upper surface of the inner supporting ring (15) is provided with a 1# transmissive sealing film pressing plate (9), which is fixed on the inner supporting ring (15) with screws (8), and the sealing cavity (17) at the top of the insulating ring (11) ) is shaped with a groove, a snap ring (12) is housed in the groove of the sealed cavity (17), and a ring-shaped alarm circuit board (7) is placed above the snap ring (12), and the ring-shaped alarm circuit board (7) There is a 2# transmissive sealing film pressure plate (5) on the top, and the 2# transmissive sealing film pressure plate (5) and the ring-shaped alarm circuit board (7) are fixed on the sealing gland (1) with screws (3) On the 2# transmissive sealing film pressing plate (5), there is an upper transmissive sealing film (6) of polyester material, and between the upper transmissive sealing film (6) and the sealing gland (1) is placed " O"-shaped sealing ring (4), a sealing gland (1) is installed on the top of the sealing cavity (17), and the sealing gland (1) is fixed on the sealing cavity (17) with screws, and the sealing gland (1) is fixed on the sealing cavity (17). ) and the sealing chamber (17) is equipped with an "O"-shaped sealing ring (2).

Beneficial effects of the present invention: The present invention adopts one transmission seal and two transmission seals, which respectively block the contact of the external medium and the internal emitter, and the transmission sealing plate has good permeability and airtightness. It ensures reliable sealing without negatively affecting the penetration strength of ray-like media. The structure of the alarm circuit is simple and compact, without redundant and exposed lines, all components and lines are mounted inside the circuit board, which makes the alarm function of the circuit board stable and reliable.

Description of drawings

Fig. 1 is a schematic structural view of the present invention.

FIG. 2 is a top view of FIG. 1 .

Detailed ways

The structure of the patent of the present invention will be described in detail in conjunction with the accompanying drawings.

A transmissive sealed cavity with double protection, as shown in Figures 1 and 2: a stop is made on the upper part of the sealed cavity 17, an insulating ring 11 is placed on the stop, and an inner support is placed inside the insulating ring 11 Ring 15, an "O" seal ring 10 is installed between the inner supporting ring 15 and the insulating ring 11; a lower transmissive sealing film 16 of polyester material is placed on the gap at the top of the inner supporting ring 15, and the lower transmissive sealing film An "O" seal ring 14 is installed between 16 and the inner supporting ring 15, and a 1# transmissive sealing film pressing plate 9 is installed on the inner supporting ring 15; a groove is formed on the sealing cavity 17 at the top of the insulating ring 11, A snap ring 12 is installed in the groove of the sealed chamber 17, a ring-shaped alarm circuit board 7 is placed above the snap ring 12, and a 2# transmission sealing film pressure plate 5 is installed above the ring-shaped alarm circuit board 7. An upper transmission sealing film 6 of polyester material is placed on the transmission sealing film pressing plate 5, and an "O"-shaped sealing ring 4 is installed between the upper transmission sealing film 6 and the sealing gland 1; 2# transmission sealing film pressing plate 5 is put on The transmissive sealing film 6 is tightly fixed with the sealing gland 1 and sealed with an "O"-shaped sealing ring 4 . As the first barrier, it blocks the contact between the external medium and the sealed cavity, prevents the medium from entering the sealed cavity, and damages the transmitter placed in the sealed cavity. The two transmissive sealing films 6 and 16 have good permeability and airtightness, and will not negatively affect the penetration strength of ray-like media while first ensuring reliable sealing. An airtight cavity is formed in the middle of the two transmission seals, and an alarm circuit board 7 is installed in the above-mentioned airtight cavity. The purpose is that when the first transmission sealing film breaks, the external medium enters the airtight cavity. Since the external medium acts as a conductive medium, the circuit board that was originally disconnected is closed instantaneously, and the circuit board sends an alarm command to the system. Remedial or other well-directed arrangements are taken before the medium penetrates the second transmissive seal, effectively ensuring the integrity of the emitter within the monolithic seal cavity. The two electrodes of the alarm circuit board 7 in the airtight cavity are connected to the outer sealed cavity 17 and the inner support ring 15 respectively. Structurally, the two are in an open circuit state, and the outer layer of the inner supporting ring 15 is inlaid with a non-metallic insulating ring 11, which realizes the open circuit state of the two electrodes in the initial stage. Only when the external medium enters the closed cavity and acts as a conductive medium, the electrodes are turned on, and the circuit board sends out a short circuit alarm command. Alarm circuit board 7 is made of phenolic laminated cloth board. The insulation performance of the phenolic laminated cloth board is good, ensuring that the circuit is in a stable and reliable disconnection state under normal conditions. The inside of the phenolic laminated cloth board is inlaid with tiny electrical components, and the upper and lower surfaces of the laminated cloth board are respectively used as two electrodes of the circuit. In this case, the phenolic laminated cloth board and the electrical components mounted inside constitute a simple and practical circuit circuit, which will be closed when the external conditions permit, thereby realizing the function of buzzer alarm. The advantages of this structural design are: simple and compact structure, no redundant and exposed lines, all components and lines are mounted inside the circuit board, making the alarm function of the circuit board stable and reliable.

A sealing gland 1 is installed on the top of the sealing chamber 17, and the sealing gland 1 is fixed on the sealing chamber 17 with screws, and an "O"-shaped sealing ring 2 is installed between the sealing gland 1 and the sealing chamber 17. A reliable seal is realized between the sealing gland 1 and the sealing chamber 17 through an "O"-shaped sealing ring 2 .

Claims (1)

1. transmission sealed chamber with duplicate protection; it is characterized in that: be processed with seam at seal chamber (17) internal upper part; be equipped with dead ring (11) at stop portion; be equipped with interior pushing out ring (15) in dead ring (11) inboard; between interior pushing out ring (15) and dead ring (11), " O " shape O-ring seal (10) is housed; be equipped with the lower transmittance sealing film (16) of polyester material at inside groove place, interior pushing out ring (15) top; between lower transmittance sealing film (16) and interior pushing out ring (15), " O " shape O-ring seal (14) is housed; upper surface at interior pushing out ring (15) is equipped with 1# transmittance sealing film pressing plate (9); be fixed on the interior pushing out ring (15) with screw (8); seal chamber (17) on dead ring (11) top is shaped with groove; in seal chamber (17) groove, snap ring (12) is housed; be equipped with the warning circuit plate (7) of annular in snap ring (12) top; annular warning circuit plate (7) top is equipped with 2# transmittance sealing film pressing plate (5); 2# transmittance sealing film pressing plate (5) and annular warning circuit plate (7) are fixed on the sealing gland (1) with screw (3); be equipped with the upper transmission-type sealing film (6) of polyester material at 2# transmittance sealing film pressing plate (5); between upper transmittance sealing film (6) and sealing gland (1), be equipped with " O " shape O-ring seal (4); on seal chamber (17) top sealing gland (1) is housed; sealing gland (1) is screwed on seal chamber (17); between sealing gland (1) and seal chamber (17), " O " shape O-ring seal (2) is housed; when extraneous medium enters closed cavity; after serving as conducting medium; electrode conduction, circuit board send the short-circuit alarming instruction.

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