Low-torque linkage double-open fire hydrant

Abstract

The invention discloses a low-torque linkage double-open fire hydrant which comprises a hydrant seat. A hydrant body is arranged on the hydrant seat; a hydrant cover is sealed at the end of the hydrant body; a valve seat is arranged between the hydrant seat and the hydrant body; a valve cavity is formed in the valve seat; a valve core is arranged in the valve cavity; an operating rod penetrates through the hydrant body and the hydrant cover; the valve core comprises a valve plate; a pressure-relief hole is formed in the valve plate and is provided with a pressure-relief valve for blocking the pressure-relief hole; the operating rod is connected with the pressure-relief valve; a linkage limiting device is arranged between the operating rod and the valve plate; when the fire hydrant is opened, an operating screw rod drives the valve plate to move downwards, and because the area of the pressure-relief valve is smaller than that of the valve plate, the pressure-relief valve can be rapidly opened through small opening torque, and thus the pressure in a cavity of the fire hydrant is reduced; and moreover, when the fire hydrant is closed, the valve plate with large area moves upwards, and then the pressure-relief valve is closed, so that the pressure-relief valve is opened or closed in a labor-saving mode, the resonance phenomenon of the internal parts is eliminated, noises are eliminated, and the low-torque linkage double-open fire hydrant is convenient and reliable to use.

Description

technical field [0001] The invention relates to a fire hydrant, in particular to a low-torque linkage double-opening fire hydrant which is easy to open. Background technique [0002] At present, with the rapid development of social stability, environmental safety protection has become one of the important issues of public concern, among which fires are particularly eye-catching, and the property losses caused by fires are relatively large. For this reason, in order to further strengthen the basic work of fire safety in various places, residents Residential areas, market towns, industrial and mining enterprises, and public places are all equipped with fire-fighting infrastructure, and fire hydrants are one of the important facilities, laying a good foundation for fire safety. The structure of the commonly used fire hydrant mostly includes the bolt seat, valve seat, connecting pipe, outlet pipe and bolt cover connected in sequence. The valve stem is provided with a hose conne...

AI Technical Summary

Problems solved by technology

Since the fire hydrant will bear a certain level of water pressure during the opening or closing process, the opening torque will be too large due to the high water pressure in the operation project, and the opening will be laborious. The rapid water flow in the hydrant cavity will cause serious resonance phenomenon caused by the impact of water flow on the internal parts, and at the same time, it will generate a lot of noise, which is not conducive to ensuring the safe use of fire hydrants

[0003] In addition, after the fire hydrant is used, there will be some remaining water in its cavity. Since the fire hydrant is completely closed and sealed when it is not in use, this part of the remaining water cannot be discharged or evaporated in time.

If the remaining water cannot be discharged quickly in winter, freezing will occur in the cavity of the fire hydrant. Since the volume of the water will expand after freezing, it will have a certain expansion force on the body of the fire hydrant, which will easily freeze the fire hydrant. cracked and damaged, seriously affecting the reuse of fire hydrants

Moreover, if the internal parts of the current fire hydrant are damaged due to accidental collision or accidental collision, the fire hydrant needs to be excavated from the ground for inspection and repair, resulting in inconvenient maintenance

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