Fire pump with adjustable baffle tongue and adjusting method of baffle tongue

An adjustment method and fire pump technology are applied to components, pumps, and pump control of elastic fluid pumping devices, which can solve the problems that the fire pump cannot simultaneously ensure the operation stability and the relative position of the fire pump cannot be adjusted. The adjustment method is simple and reliable, the operation stability is improved, and the efficiency is improved

Active Publication Date: 2021-08-24
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in various known technical solutions, the relative positions of the fire pump tongue and the impeller cannot be adjusted, which causes the fire pump to be unable to ensure the operation stability of the rated flow condition and the small flow condition at the same time

Method used

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  • Fire pump with adjustable baffle tongue and adjusting method of baffle tongue
  • Fire pump with adjustable baffle tongue and adjusting method of baffle tongue
  • Fire pump with adjustable baffle tongue and adjusting method of baffle tongue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0037] A fire pump is driven by a motor. The rated flow rate, rated head and rated speed of the original pump are 600m 3 / h, 100m and 1480r / min. The efficiency of the original pump is low under the condition of small flow rate, and the vibration is severe, which has great potential safety hazards. With 0.3 times the rated flow condition, the flow rate is 180m 3 / h running as an example, the measured head is 162m, the efficiency is 53%, and the vibration intensity of the drive end bearing in the horizontal radial direction and vertical radial direction is 7.5mm / s and 6.8mm / s respectively. The fire pump is transformed into an adjustable tongue. The shape of the expansion bag is approximately ellipsoidal to maintain a smooth transition effect with the original tongue structure. Three pressure holes, A, B, and C, are newly established, ∠ZOA, ∠ZOB and ∠ZOC are 285°, 300° and 330° respectively, when the tongue adjustable fire pump is 180m 3When operating under the condition of / h...

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PUM

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Abstract

The invention discloses a fire pump with an adjustable baffle tongue. The fire pump comprises a volute provided with the baffle tongue and an impeller located in the volute. The fire pump is characterized in that a through hole enabling the inside of the volute to be communicated with the outside is formed in the baffle tongue, and an adjusting device is arranged in the through hole; the adjusting device is connected with a switching device; the switching device is connected with a plurality of pressure tapping pipes; each pressure tapping pipe is provided with a gate valve and is communicated with different positions of the volute to acquire different pressures; and the adjusting device is composed of an outer cylinder, an inner cylinder and a telescopic bag which is arranged between the outer cylinder and the inner cylinder and provided with an opening in the outer side of the volute. The telescopic bag is made of rubber or latex materials, and the length of the part, extending out of the tail end of the baffle tongue, of the telescopic bag is adjusted according to the pressure tapped by the pressure tapping pipes. The invention further discloses an adjusting method of the fire pump with the adjustable baffle tongue. Only the gate valve of one pressure tapping pipe is opened while other gate valves are kept in the closed state during adjustment each time. The size of the baffle tongue can be adjusted when the fire pump runs, the efficiency under the condition of a small flow point can be improved, and the running stability can be greatly improved.

Description

technical field [0001] The invention relates to the field of fire pumps, in particular to a fire pump with an adjustable tongue and an adjustment method thereof. Background technique [0002] The fire protection system is an important implementation of the safety of people's lives and property, and is widely used in various places such as shopping malls, office buildings, factories and residential buildings. The fire pump is an essential and important part of the fire protection system. When a fire occurs, the fire pump starts up urgently, and a large amount of water is used for fire fighting. Centrifugal pumps are generally used as fire pumps. When designing fire pumps, the highest efficiency point is usually taken as the rated flow point. At the same time, the rated flow point is used as the standard operating condition to carry out hydraulic model and structural design, and the rated flow rate is fully guaranteed. Click on a series of performance indicators such as head,...

Claims

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Application Information

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IPC IPC(8): F04D1/00F04D29/42F04D15/00
CPCF04D1/00F04D29/426F04D15/0027
Inventor 张翮辉常春平游浩林
Owner XIANGTAN UNIV
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