Sealing device for vacuum chamber of fire alarm switch

Abstract

The utility model discloses a fire alarm switch vacuum chamber sealing device which comprises a vacuum chamber with an inner cavity, one end of the inner cavity is provided with a vacuum connector, the other end of the inner cavity is provided with a fire alarm switch, and a breather pipe of the fire alarm switch extends into the inner cavity. An adjustable elastic sealing piece is arranged between the outer side of the breather 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 ventilation pipe is located between the movable punch and the fixed punch. According to the utility model, plastic stamping sealing operation can be carried out on the breather pipe of the fire alarm switch in a vacuum environment, and tight sealing of the breather pipe of the fire alarm switch is ensured.

Description

Technical Field

[0001] This utility model belongs to the technical field of sealing fire alarm switches, specifically relating to a sealing device for the vacuum chamber of a fire alarm switch. Background Technology

[0002] In the production process of aircraft engine switches, it is necessary to evacuate the internal cavity of the fire alarm switch before sealing the vent pipe connected to the inside of the switch to ensure a vacuum state. In existing technology, due to the small diameter of the vent pipe, it is difficult to effectively evacuate the internal cavity of the fire alarm switch directly through the vent pipe. This results in gas inevitably entering the interior of the fire alarm switch during the stamping and sealing process of the vent pipe, affecting the vacuum level inside the switch.

[0003] Therefore, in view of the problem that it is difficult to ensure the vacuum level inside the fire alarm switch during the sealing operation of the vent pipe of the fire alarm switch in the prior art, this utility model discloses a vacuum chamber sealing device for fire alarm switches. Utility Model Content

[0004] This utility model discloses a vacuum chamber sealing device for a fire alarm switch, which can ensure that the vent pipe of the fire alarm switch is plastically stamped and sealed in a vacuum environment, thus ensuring that the vent pipe of the fire alarm switch is tightly sealed.

[0005] This utility model is achieved through the following technical solution:

[0006] A vacuum chamber sealing device for a fire alarm switch includes a vacuum chamber with an inner cavity. A vacuum connector is provided at one end of the inner cavity, and a fire alarm switch is provided at the other end of the inner cavity. The vent pipe of the fire alarm switch extends into the interior of the inner cavity, and an adjustable elastic seal is provided between the outer side of the vent pipe and the inner cavity. A movable punch and a fixed punch are provided on the upper and lower sides of the inner cavity respectively, and the vent pipe is located between the movable punch and the fixed punch.

[0007] An adjustable elastic seal fills and seals the area between the vent pipe and the inner cavity. Simultaneously, a vacuum connector is connected to a vacuum machine, which evacuates the inner cavity to a vacuum state. Then, a press applies pressure to the movable punch, causing it to move closer to the fixed punch. This pressure, in turn, applies pressure to the vent pipe of the fire alarm switch located between the movable and fixed punches in a vacuum environment. The vent pipe undergoes plastic deformation and adheres under vacuum pressure, thus achieving a vacuum seal.

[0008] To better realize this utility model, the adjustable elastic seal further includes an elastic sealing bushing and a clamping nut. The elastic sealing bushing is filled and disposed inside the inner cavity. The end of the elastic sealing bushing away from the vacuum connector is threadedly fitted with a clamping nut. Both the elastic sealing bushing and the clamping nut have a through hole at their center for the vent pipe of the fire alarm switch to pass through.

[0009] To better realize this utility model, the through hole at the center of the elastic sealing bushing is further connected to the vent pipe with an interference fit, and the diameter of the through hole at the center of the clamping nut is larger than the outer diameter of the vent pipe.

[0010] To better realize this utility model, the upper side of the inner cavity is provided with an upper stepped hole, a movable punch is slidably installed in the upper stepped hole, and a return spring is sleeved on the outside of the movable punch.

[0011] To better realize this utility model, the punching end of the movable punch is provided with a V-shaped protrusion, and the end of the V-shaped protrusion that contacts the vent pipe is provided with an arc-shaped part.

[0012] To better realize this utility model, at least one set of sealing rings is further provided between the outer side of the movable punch and the inner wall of the upper stepped hole.

[0013] To better realize this utility model, a lower stepped hole is further provided on the lower side of the inner cavity, and a fixed punch is installed in the lower stepped hole.

[0014] To better realize this utility model, at least one set of sealing rings is further provided between the outer side of the fixed punch and the inner wall of the lower stepped hole.

[0015] To better realize this utility model, the stamping end of the fixed punch is further provided with a V-shaped groove and an arc groove perpendicular to the V-shaped groove.

[0016] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0017] This invention inserts the vent pipe of a fire alarm switch into the inner cavity of a vacuum chamber, and fills and seals the area between the vent pipe and the inner cavity with an adjustable elastic seal. At the same time, a vacuum machine connected to a vacuum connector evacuates the inner cavity to a vacuum state, thereby ensuring that the inside of the fire alarm switch is evacuated to a vacuum state. Then, pressure is applied to the upper and lower sides of the vent pipe by a movable punch and a fixed punch, causing the vent pipe to undergo plastic deformation and adhere and seal in the vacuum environment, ultimately ensuring the vacuum level requirement inside the fire alarm switch. Attached Figure Description

[0018] Figure 1A schematic diagram of the sealing device for the vacuum chamber of a fire alarm switch.

[0019] Figure 2 This is a schematic diagram of the vacuum chamber.

[0020] Figure 3 This is a schematic diagram of the structure of the movable punch;

[0021] Figure 4 This is the front view of the fixed punch;

[0022] Figure 5 This is a side view of the fixed punch.

[0023] Wherein: 1-vacuum connector; 2-vacuum chamber; 3-reset spring; 4-movable punch; 5-sealing ring; 6-elastic sealing bushing; 7-compression nut; 8-fire alarm switch; 9-fixed punch; 100-V-shaped protrusion; 200-V-shaped groove; 300-circular arc groove. Detailed Implementation

[0024] Example 1:

[0025] This embodiment of a fire alarm switch vacuum chamber sealing device includes a vacuum chamber 2 with an inner cavity. A vacuum connector 1 is provided at one end of the inner cavity, and a fire alarm switch 8 is provided at the other end of the inner cavity. The vent pipe of the fire alarm switch 8 extends into the interior of the inner cavity, and an adjustable elastic seal is provided between the outer side of the vent pipe and the inner cavity. Movable punches 4 and fixed punches 9 are provided on the upper and lower sides of the inner cavity respectively, and the vent pipe is located between the movable punches 4 and the fixed punches 9.

[0026] like Figure 1 , Figure 2 As shown, the vacuum chamber 2 has an inner cavity. A vacuum connector 1 is threadedly connected to the left end of the inner cavity, and a vent pipe for the fire alarm switch 8 is inserted into the right end. An adjustable elastic seal is installed between the outer wall of the vent pipe and the inner wall of the inner cavity. By applying pressure to the adjustable elastic seal, it deforms and tightly fills the area between the outer wall of the vent pipe and the inner wall of the inner cavity, thus sealing the inner cavity. A movable punch 4 and a fixed punch 9 are respectively installed on the upper and lower sides of the inner cavity. The fixed punch 9 supports and positions the vent pipe, while the movable punch 4 applies pressure to the vent pipe under the action of a press. The vacuum connector 1 is connected to a vacuum machine to evacuate the inner cavity to a vacuum state. Then, pressure is applied to the vent pipe by the movable punch 4, causing the vent pipe to undergo plastic deformation and adhere in the vacuum environment, thus sealing the vent pipe.

[0027] Example 2:

[0028] This embodiment is a further optimization based on Embodiment 1, such as... Figure 1As shown, the adjustable elastic seal includes an elastic sealing bushing 6 and a clamping nut 7. The elastic sealing bushing 6 is filled and disposed inside the inner cavity. The end of the elastic sealing bushing 6 away from the vacuum connector 1 is threadedly fitted with the clamping nut 7. Both the elastic sealing bushing 6 and the clamping nut 7 have through holes at their centers for the vent pipe of the fire alarm switch 8 to pass through.

[0029] By rotating the clamping nut 7, the clamping nut 7 compresses the elastic sealing bushing 6, causing the elastic sealing bushing 6 to deform elastically and fill the area between the vent pipe and the inner cavity, ultimately achieving a seal on the inner cavity. By adjusting the rotation angle of the clamping nut 7, the clamping force of the clamping nut 7 on the elastic sealing bushing 6 can be adjusted, thereby adjusting the degree of elastic deformation of the elastic sealing bushing 6.

[0030] Furthermore, the through hole at the center of the elastic sealing bushing 6 is interference-fitted with the vent pipe to ensure that when the elastic sealing bushing 6 is subjected to elastic deformation under pressure, the inner wall of the through hole can fit tightly with the outer wall of the vent pipe, thus ensuring the sealing of the inner cavity.

[0031] Furthermore, the diameter of the through hole at the center of the clamping nut 7 is larger than the outer diameter of the vent pipe to avoid interference between the clamping nut 7 and the vent pipe when the clamping nut 7 rotates.

[0032] The other parts of this embodiment are the same as those in Embodiment 1, so they will not be described again.

[0033] Example 3:

[0034] This embodiment is a further optimization based on the above embodiment 1 or 2, such as... Figure 3 As shown, an upper stepped hole is provided on the upper side of the inner cavity, and a movable punch 4 is slidably installed in the upper stepped hole. A return spring 3 is sleeved on the outside of the movable punch 4.

[0035] As shown in the figure, the upper end of the movable punch 4 is provided with a pressure-receiving surface. The press applies downward pressure to this surface, causing the movable punch 4 to move downwards along the upper stepped hole. Simultaneously, the return spring 3 is compressed. The downward pressure of the movable punch 4 applies pressure to the vent pipe in the inner cavity, causing it to plastically deform and seal. After the press releases the pressure, the return spring 3 rebounds, causing the movable punch 4 to move upwards to reset.

[0036] Furthermore, the V-shaped protrusion 100 at the punching head end of the movable punch 4 has an arc-shaped portion at the end that contacts the vent pipe, and the V-shaped protrusion 100 is arranged perpendicular to the axis of the vent pipe. By providing the arc-shaped portion, a smooth contact is ensured between the V-shaped protrusion 100 and the wall of the vent pipe, ensuring sufficient pressure is applied to the vent pipe without directly cutting it off.

[0037] Furthermore, at least one set of sealing rings 5 ​​is provided between the outer side of the movable punch 4 and the inner wall of the upper stepped hole. By providing the sealing rings 5, the vacuum degree inside the cavity is ensured.

[0038] The other parts of this embodiment are the same as those in Embodiment 1 or 2 above, so they will not be described again.

[0039] Example 4:

[0040] This embodiment is a further optimization based on any one of embodiments 1-3 above, such as... Figure 4 and Figure 5 As shown, a lower stepped hole is provided on the lower side of the inner cavity, and a fixed punch 9 is installed in the lower stepped hole.

[0041] Furthermore, at least one set of sealing rings 5 ​​is provided between the outer side of the fixed punch 9 and the inner wall of the lower stepped hole. By providing the sealing rings 5, the vacuum degree inside the cavity is ensured.

[0042] Furthermore, the stamping end of the fixed punch 9 is provided with a V-shaped groove 200, and one side of the V-shaped groove 200 is provided with an arc groove 300 perpendicular to the V-shaped groove 200. The outline of the arc groove 300 corresponds to the outer outline of the vent pipe to achieve positioning of the vent pipe. The V-shaped groove 200 is perpendicular to the axis of the vent pipe, and works with the V-shaped protrusion 100 to plastically compress the upper and lower sides of the vent pipe, ensuring that the vent pipe is plastically deformed and adhered for closure.

[0043] The other parts of this embodiment are the same as any one of the embodiments 1-3 above, so they will not be described again.

[0044] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A vacuum chamber sealing device for a fire alarm switch, comprising a vacuum chamber (2) with an inner cavity, characterized in that, A vacuum connector (1) is provided at one end of the inner cavity, and a fire alarm switch (8) is provided at the other end of the inner cavity. The vent pipe of the fire alarm switch (8) extends into the interior of the inner cavity. An adjustable elastic seal is provided between the outer side of the vent pipe and the inner cavity. A movable punch (4) and a fixed punch (9) are provided on the upper and lower sides of the inner cavity respectively. The vent pipe is located between the movable punch (4) and the fixed punch (9).

2. The fire alarm switch vacuum chamber sealing device according to claim 1, characterized in that, The adjustable elastic seal includes an elastic sealing bushing (6) and a clamping nut (7). The elastic sealing bushing (6) is filled inside the inner cavity. The end of the elastic sealing bushing (6) away from the vacuum connector (1) is threaded with a clamping nut (7). Both the elastic sealing bushing (6) and the clamping nut (7) have through holes at their centers for the ventilation pipe of the fire alarm switch (8) to pass through.

3. The fire alarm switch vacuum chamber sealing device according to claim 2, characterized in that, The through hole at the center of the elastic sealing bushing (6) is interference-fitted with the vent pipe, and the diameter of the through hole at the center of the clamping nut (7) is larger than the outer diameter of the vent pipe.

4. A vacuum chamber sealing device for a fire alarm switch according to any one of claims 1-3, characterized in that, The upper side of the inner cavity is provided with an upper stepped hole, and a movable punch (4) is slidably installed in the upper stepped hole. A return spring (3) is sleeved on the outside of the movable punch (4).

5. The fire alarm switch vacuum chamber sealing device according to claim 4, characterized in that, The punching end of the movable punch (4) is provided with a V-shaped protrusion (100), and the end of the V-shaped protrusion (100) that contacts the vent pipe is provided with an arc-shaped part.

6. The vacuum chamber sealing device for a fire alarm switch according to claim 5, characterized in that, At least one set of sealing rings (5) is provided between the outer side of the movable punch (4) and the inner wall of the upper stepped hole.

7. A vacuum chamber sealing device for a fire alarm switch according to any one of claims 1-3, characterized in that, A lower stepped hole is provided on the lower side of the inner cavity, and a fixed punch (9) is installed in the lower stepped hole.

8. The vacuum chamber sealing device for a fire alarm switch according to claim 7, characterized in that, At least one set of sealing rings (5) is provided between the outer side of the fixed punch (9) and the inner wall of the lower stepped hole.

9. A vacuum chamber sealing device for a fire alarm switch according to claim 8, characterized in that, The stamping end of the fixed punch (9) is provided with a V-groove (200) and an arc groove (300) perpendicular to the V-groove (200).

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