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CN-224217424-U - Sealing device for vacuum chamber of fire alarm switch

CN224217424UCN 224217424 UCN224217424 UCN 224217424UCN-224217424-U

Abstract

The utility model discloses a sealing device for a vacuum chamber of a fire alarm switch, which comprises a vacuum chamber with an inner cavity, wherein one end of the inner cavity is provided with a vacuum connector, the other end of the inner cavity is provided with the fire alarm switch, a vent pipe of the fire alarm switch extends into the inner cavity, an adjustable elastic sealing element is arranged between the outer side of the vent pipe and the inner cavity, a movable punch and a fixed punch are correspondingly arranged on the upper side and the lower side of the inner cavity, and the vent pipe is positioned between the movable punch and the fixed punch.

Inventors

  • WAN HAIJUN

Assignees

  • 四川泛华航空仪表电器有限公司

Dates

Publication Date
20260508
Application Date
20250414

Claims (9)

  1. 1. The utility model provides a fire alarm switch vacuum chamber closing device, includes vacuum chamber (2) that have the inner chamber, its characterized in that, the one end of inner chamber is provided with vacuum joint (1), the other end of inner chamber is provided with fire alarm switch (8), the breather pipe of fire alarm switch (8) extends to the inside of inner chamber, be provided with adjustable elastic seal spare between the outside of breather pipe and the inner chamber, the upper and lower both sides of inner chamber correspond and are provided with movable punch (4) and fixed punch (9), the breather pipe is located between movable punch (4) and fixed punch (9).
  2. 2. The vacuum chamber sealing device of the fire alarm switch device according to claim 1, wherein the adjustable elastic sealing piece comprises an elastic sealing bushing (6) and a compression nut (7), the elastic sealing bushing (6) is filled in an inner cavity, the compression nut (7) is installed at one end of the elastic sealing bushing (6) far away from the vacuum joint (1) in a threaded fit manner, and through holes for the ventilation pipe of the fire alarm switch device (8) to pass are formed in the centers of the elastic sealing bushing (6) and the compression nut (7).
  3. 3. A fire switch vacuum chamber closure device according to claim 2, characterized in that the through hole in the centre of the elastic sealing bush (6) is in interference fit connection with the vent pipe, and the diameter of the through hole in the centre of the gland nut (7) is larger than the outer diameter of the vent pipe.
  4. 4. A fire switch vacuum chamber sealing device according to any one of claims 1-3, wherein an upper stepped hole is arranged on the upper side of the inner cavity, a movable punch (4) is mounted in the upper stepped hole in a sliding fit manner, and a return spring (3) is sleeved outside the movable punch (4).
  5. 5. The vacuum chamber sealing device of the fire alarm switch device according to claim 4, wherein the stamping end of the movable punch (4) is provided with a V-shaped bulge (100), and one end of the V-shaped bulge (100) contacted with the vent pipe is provided with an arc-shaped part.
  6. 6. The sealing device for the vacuum chamber of the fire alarm switch according to claim 5, wherein at least one group of sealing rings (5) is arranged between the outer side surface of the movable punch (4) and the inner wall of the upper stepped hole.
  7. 7. A fire switch vacuum chamber closure assembly as claimed in any one of claims 1 to 3 wherein the underside of the inner chamber is provided with a lower stepped bore in which a fixed punch (9) is fitted.
  8. 8. The vacuum chamber sealing device of the fire alarm switch according to claim 7, wherein at least one group of sealing rings (5) are arranged between the outer side surface of the fixed punch (9) and the inner wall of the lower stepped hole.
  9. 9. The vacuum chamber sealing device of the fire alarm switch according to claim 8, wherein the stamping end of the fixed punch (9) is provided with a V-shaped groove (200) and an arc groove (300) which is perpendicular to the V-shaped groove (200).

Description

Sealing device for vacuum chamber of fire alarm switch Technical Field The utility model belongs to the technical field of sealing of fire alarm switches, and particularly relates to a sealing device for a vacuum chamber of a fire alarm switch. Background In the production process of the aeroengine switch, after the interior of the fire switch is vacuumized, a vent pipe connected with the interior of the fire switch is sealed, so that the vacuum state of the interior of the fire switch is ensured. In the prior art, because the diameter of the vent pipe of the fire alarm switch device is smaller, the vent pipe is difficult to directly carry out effective vacuumizing operation on the inside of the fire alarm switch device, so that gas always enters the inside of the fire alarm switch device in the process of punching and sealing the vent pipe, and the vacuum degree inside the fire alarm switch device is influenced. Therefore, the utility model discloses a sealing device for a vacuum chamber of a fire alarm switch, which aims at solving the problem that the vacuum degree in the fire alarm switch is difficult to ensure in the process of sealing a vent pipe of the fire alarm switch in the prior art. Disclosure of utility model The utility model discloses a sealing device for a vacuum chamber of a fire alarm switch, which can ensure that a vent pipe of the fire alarm switch is subjected to plastic stamping sealing operation in a vacuum environment, and ensure that the vent pipe of the fire alarm switch is tightly sealed. The utility model is realized by the following technical scheme: The utility model provides a fire alarm switch vacuum chamber closing device, includes the vacuum chamber that has the inner chamber, the one end of inner chamber is provided with the vacuum joint, the other end of inner chamber is provided with the fire alarm switch, the breather pipe of fire alarm switch extends to the inside of inner chamber, be provided with adjustable elastic sealing member between the outside of breather pipe and the inner chamber, the upper and lower both sides of inner chamber correspond and are provided with movable drift and fixed drift, the breather pipe is located between movable drift and the fixed drift. And filling and sealing the area between the vent pipe and the inner cavity through the adjustable elastic sealing piece, connecting the vacuum connector with a vacuum machine, and sucking the inner cavity to a vacuum state through the vacuum machine. Then, the movable punch is pressed by the punching machine, so that the movable punch moves close to the fixed punch, and then the vent pipe of the fire alarm switch device positioned between the movable punch and the fixed punch is pressed in a vacuum environment, and the vent pipe of the fire alarm switch device is pressed in the vacuum environment to be subjected to plastic deformation and adhesion formation, so that the vent pipe is sealed in vacuum. In order to better realize the utility model, the adjustable elastic sealing element further comprises an elastic sealing bushing and a compression nut, wherein the elastic sealing bushing is filled in the inner cavity, the compression nut is arranged at one end of the elastic sealing bushing far away from the vacuum joint in a threaded fit manner, and through holes for the vent pipe of the fire switch to pass through are formed in the centers of the elastic sealing bushing and the compression nut. In order to better realize the utility model, further, the through hole at the center of the elastic sealing bushing is in interference fit connection with the vent pipe, and the diameter of the through hole at the center of the compression nut is larger than the outer diameter of the vent pipe. In order to better realize the utility model, further, the upper side of the inner cavity is provided with an upper stepped hole, a movable punch is arranged in the upper stepped hole in a sliding fit manner, and a reset spring is sleeved outside the movable punch. In order to better realize the utility model, further, the stamping end of the movable punch is provided with a V-shaped bulge, and one end of the V-shaped bulge, which is contacted with the vent pipe, is provided with an arc-shaped part. In order to better realize the utility model, at least one group of sealing rings is arranged between the outer side surface of the movable punch and the inner wall of the upper stepped hole. In order to better realize the utility model, further, the lower side of the inner cavity is provided with a lower stepped hole, and a fixed punch is cooperatively arranged in the lower stepped hole. In order to better realize the utility model, at least one group of sealing rings is arranged between the outer side surface of the fixed punch and the inner wall of the lower stepped hole. In order to better realize the utility model, the stamping end of the fixed punch is further provided with a V-shaped groove and an arc groove which is