Fire-fighting pressure switch

Abstract

The utility model discloses a fire-fighting pressure switch, which relates to the technical field of fire-fighting switches and comprises a shell, an electric appliance interface end is arranged on the shell, a rubber sleeve is mounted in the electric appliance interface end, threads are arranged on the upper portion of the inner wall of the electric appliance interface end and used for being connected with a locking nut, and one end of the locking nut is filled with an explosion-proof rubber layer used for plugging an electric wire. According to the utility model, the rubber sleeve and the locking nut are arranged, the locking nut extrudes the rubber sleeve to fix and seal the electric wire, and the rubber sleeve and the explosion-proof rubber layer are matched to increase the sealing performance of the interface end of the electric appliance; and by arranging the annular inclined surface, when the rubber sleeve is extruded, the inner wall of the lower part of the rubber sleeve extrudes towards the inner side of the rubber sleeve to lock and seal the electric wire.

Description

TECHNICAL FIELD

[0001] The utility model relates to fire fighting switch technical field more specifically relates to a kind of fire-fighting pressure switch. BACKGROUND

[0002] The explosion-proof fire-fighting pressure switch is a water pressure control switch, which is an important component of the water supply system pipeline. The sealing performance of the wire interface end of the explosion-proof fire-fighting pressure switch is particularly important. The existing explosion-proof fire-fighting pressure switch relies on explosion-proof glue to seal the wire interface end. Although the explosion-proof glue can provide a certain sealing performance, it cannot completely prevent leakage caused by aging and cracking of the glue. Long-term use and harsh environmental conditions can cause the explosion-proof glue to fail, thereby affecting the normal operation of the equipment. Therefore, it is necessary to improve the structure to improve the sealing performance. SUMMARY

[0003] The utility model discloses a fire-fighting pressure switch to solve the above technical problems.

[0004] To achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0005] A fire-fighting pressure switch includes a housing, an electrical interface end is provided on the housing, a rubber sleeve is installed in the electrical interface end, a thread is provided on the upper part of the inner wall of the electrical interface end for connecting with a locking nut, and an explosion-proof glue layer is filled in one end of the locking nut for plugging the wire. The rubber sleeve is used for passing through the wire, one end of the rubber sleeve is communicated with the inside of the housing, the other end is communicated with the locking nut, and the wire enters the inside of the housing from one end of the locking nut and is connected with the electrical device.

[0006] An annular step is provided on the top of the rubber sleeve, an annular inclined surface is provided on the bottom of the rubber sleeve, and the annular inclined surface is inclined inward from top to bottom. The shape of the inner wall of the bottom of the electrical interface end is matched with the annular inclined surface, the annular step is used for abutting against the locking nut, the width of the annular step is consistent with the wall thickness of the locking nut, the width of the annular step is half of the wall thickness of the rubber sleeve, the locking nut is tightened, and the bottom of the electrical interface end is matched to compress the rubber sleeve. By providing the annular inclined surface, when the rubber sleeve is extruded, the lower inner wall of the rubber sleeve is deformed inward to lock and seal the wire.

[0007] The inner diameter of the rubber sleeve gradually decreases from top to bottom. The inner diameter of the upper part of the rubber sleeve is set to be wider to facilitate the wire to pass through. The inner diameter of the lower part of the rubber sleeve gradually decreases to fix the wire and reduce the closing area. The smaller the closing area is, the easier it is to form a seal on the wire when the rubber sleeve is extruded.

[0008] The lower part of the inner wall of the rubber sleeve is provided with a mounting groove, and an annular sealing silica gel pad is bonded in the mounting groove, and a plurality of convex rings are arranged on the inner side of the annular sealing silica gel pad from top to bottom, and the convex ring is composed of a plurality of protrusions distributed along the inner wall of the annular silica gel sealing pad in the circumferential direction. The annular sealing silica gel pad is softer than the rubber sleeve and is easy to be extruded and deformed, and the annular sealing silica gel pad has good high-temperature resistance, electrical insulation performance and chemical stability, and the protrusions are designed to fill the gap between the electric wire and the annular sealing silica gel pad to increase the sealing performance of the rubber sleeve.

[0009] The utility model discloses the beneficial effect is as follows:

[0010] Setting rubber sleeve and locking nut, through locking nut extruding rubber sleeve makes electric wire be fixed and sealed, and rubber sleeve and explosion -proof rubber layer cooperation increases the sealing performance of electrical interface end;Through setting annular slope, when extruding rubber sleeve, the lower inner wall of rubber sleeve extrudes to the inside of rubber sleeve and locks and seals electric wire. DRAWINGS

[0011] Fig. 1 It is the perspective view of the utility model;

[0012] Fig. 2 It is the internal structure view of electrical interface end;

[0013] Fig. 3 It is annular sealing silica gel pad structure schematic view.

[0014] Fig. 1, shell;2, electrical interface end;3, rubber sleeve;4, locking nut;5, explosion -proof rubber layer;6, annular step;7, annular slope;8, mounting groove;9, annular sealing silica gel pad;10, protrusion;11, electric wire. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantage of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings in the utility model embodiment. Obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiments. The components of the utility model embodiment described and shown in the drawings can be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0017] Embodiment 1

[0018] As Figs. 1 to 3 shown, the embodiment provides a fire-fighting pressure switch, comprising a shell 1, an electrical interface end 2 is arranged on the shell 1, a rubber sleeve 3 is installed in the electrical interface end 2, a thread is arranged on the upper part of the inner wall of the electrical interface end 2 for connecting with a locking nut 4, an explosion-proof rubber layer 5 is filled in one end of the locking nut 4 for plugging a wire 11. The rubber sleeve 3 is used for passing through the wire 11, one end of the rubber sleeve 3 is communicated with the inside of the shell 1, and the other end is communicated with the locking nut 4, and the wire 11 enters the inside of the shell 1 from one end of the locking nut 4 and is connected with an electrical device.

[0019] An annular step 6 is arranged on the top of the rubber sleeve 3, an annular inclined surface 7 is arranged on the bottom of the rubber sleeve 3, and the annular inclined surface 7 is inclined to the inside of the rubber sleeve 3 from top to bottom. The shape of the inner wall of the bottom of the electrical interface end 2 is matched with the annular inclined surface 7, the annular step 6 is used for abutting against the locking nut 4, the width of the annular step 6 is consistent with the wall thickness of the locking nut 4, the width of the annular step 6 is half of the wall thickness of the rubber sleeve 3, the rubber sleeve 3 is compressed by the cooperation of the tightening of the locking nut 4 and the bottom of the electrical interface end, and the lower inner wall of the rubber sleeve 3 is deformed to the inside of the rubber sleeve 3 to lock and seal the wire 11 when the rubber sleeve 3 is extruded.

[0020] The inner diameter of the rubber sleeve 3 gradually decreases from top to bottom. The inner diameter of the upper part of the rubber sleeve 3 is set to be wider to facilitate the wire 11 to pass through. The inner diameter of the lower part of the rubber sleeve 3 gradually decreases to close and fix the wire 11 and reduce the closing area, and the smaller the closing area is, the easier it is to form a seal on the wire 11 when the rubber sleeve 3 is extruded.

[0021] An installation groove 8 is arranged on the lower part of the inner wall of the rubber sleeve 3, an annular sealing silica gel pad 9 is bonded in the installation groove 8, a plurality of convex rings are arranged on the inside of the annular sealing silica gel pad 9 from top to bottom, and the convex ring is composed of a plurality of protrusions 10 distributed along the circumferential direction of the inner wall of the annular silica gel sealing pad. The annular sealing silica gel pad 9 is softer than the rubber sleeve 3 and is easy to extrude and deform, and the annular sealing silica gel pad 9 has good high-temperature resistance, electrical insulation performance and chemical stability, and the protrusions 10 fill the gap between the wire 11 and the annular sealing silica gel pad 9 to increase the sealing performance of the rubber sleeve 3.

Claims

1. A fire protection pressure switch comprising a housing, characterised in that: The shell is provided with an electric appliance interface end, a rubber sleeve is mounted in the electric appliance interface end, a screw thread is arranged on the upper portion of the inner wall of the electric appliance interface end for connecting with a locking nut, and the one end of the locking nut is filled with an explosion-proof rubber layer for plugging the electric wire.

2. The fire protection pressure switch according to claim 1, wherein, The rubber sleeve is provided with an annular step on the top and an annular inclined surface on the bottom, and the annular inclined surface is inclined to the inner side of the rubber sleeve from top to bottom.

3. The fire protection pressure switch according to claim 2, wherein, The inner diameter of the rubber sleeve gradually decreases from top to bottom.

4. The fire protection pressure switch according to claim 3, wherein, The inner wall of the rubber sleeve is provided with a mounting groove on the lower portion, an annular sealing silica gel pad is bonded in the mounting groove, the inner side of the annular sealing silica gel pad is provided with a plurality of convex rings from top to bottom, and the convex ring is composed of a plurality of convexes distributed along the circumferential direction of the inner wall of the annular silica gel sealing pad.

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