Overheating protection device for fire pump during low-flow operation

Abstract

The invention relates to the technical field of fire fighting, and provides an overheating protection device during low-flow operation of a fire pump, the overheating protection device comprises a water pump outer frame and a pressure reduction base, the water pump outer frame comprises a water pump machine, and the bottom end of the water pump machine is rotatably connected with a rotating block used for guiding water flow to turn; a valve frame used for controlling water flow to flow in and out is arranged on one side of the rotating block, the water pump outer frame is arranged at the top end of the pressure reduction base, the pressure reduction base comprises a large gear frame, and a water outlet control chamber used for water source circulation is arranged on one side of the large gear frame. The water flow in the water pump outer frame forms synchronous thrust, so that the water flow under internal low pressure forms a synchronous rising stage, and the water flow is synchronously clamped with the limiting hole seat through the central base, so that the water flow cannot be output in an overload manner, the water flow is prevented from being overloaded and exceeding the bearing limit of the water pump, and the service life of the device is prolonged.

Description

technical field [0001] The invention relates to the technical field of fire protection, in particular to an overheat protection device for a fire water pump during low-flow operation. Background technique [0002] The fire water provided by most fire water sources requires fire pumps to be pressurized to meet the water pressure and water volume requirements during fire fighting. The failure of the water pump due to improper installation and maintenance will inevitably affect fire fighting and rescue and cause unnecessary losses. [0003] During the operation of the pump, due to the change of the resistance of the pump system and the closed operation at startup, the pump often runs in a small flow state. There will be no problem in short-term operation, but if it is in this state for a long time The operation of the pump will cause some undesirable phenomena, such as the temperature rise of the pump, radial thrust problems and surge problems. [0004] Loss of power is the di...

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Problems solved by technology

[0002] The fire-fighting water provided by most fire-fighting water sources needs to be pressurized by fire-fighting water pumps to meet the requirements for water pressure and water volume during fire-fighting. Failure of water pumps due to improper installation and maintenance will inevitably affect fire-fighting and rescue and cause unnecessary losses.

[0003] During the operation of the water pump, due to the change of the resistance of the pump system and the closed operation when starting, the water pump often operates in a state of small flow, and there will be no problems in short-term operation, but if it is in this state for a long time The operation of the pump will cause some adverse phenomena, such as the temperature rise of the pump, the problem of radial thrust and surge, etc.

[0004] Lost power is the difference between the shaft power consumed by the pump and the hydraulic power it emits. Except for a small amount of mechanical friction loss, the others will be converted into heat energy and then transferred to the liquid conveyed in the pump, resulting in The occurrence of the pump temperature rise phenomenon

[0005] However, the current fire pumps do not have relevant overheating protection devices when they are running at low flow rates, and the fire pumps in the overheated state will be overloaded due to the problem of idling and cannot be used normally, and the service life of the equipment is relatively low. Therefore, we propose An overheating protection device for fire pumps operating at low flow rates

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