中低壓消防泵主要有四種結構類型
來源：http://m.xintli.net/ 日期：2022-06-02
中低壓消防泵主要有四種結構型式：中低壓單級離心泵、中低壓兩級離心泵、中低壓串并聯離心泵和中低壓串聯離心泵。
There are mainly four structural types of medium and low pressure fire pumps: medium and low pressure single-stage centrifugal pump, medium and low pressure two-stage centrifugal pump, medium and low pressure series parallel centrifugal pump and medium and low pressure series centrifugal pump.
中低壓單級離心泵：
Medium and low pressure single-stage centrifugal pump:
基本結構類似于低壓單級離心泵，泵腔內裝有葉輪。形成介質壓力的基本原理是通過提高水泵轉速來調節壓力。中低壓單級離心泵的轉速一般在3500～6000rpm，而低壓單級離心泵的轉速一般在3500rpm以下。因此，中低壓單級離心泵一般都帶有增速齒輪箱。
The basic structure is similar to the low-pressure single-stage centrifugal pump, and the impeller is installed in the pump cavity. The basic principle of forming medium pressure is to adjust the pressure by increasing the speed of the water pump. The speed of medium and low pressure single-stage centrifugal pump is generally 3500 ~ 6000rpm, while the speed of low-pressure single-stage centrifugal pump is generally below 3500rpm. Therefore, medium and low pressure single-stage centrifugal pumps are generally equipped with speed increasing gear boxes.
工作過程如下：消防車啟動后，將水泵轉速調4250rpm，泵壓頭1MPa，水泵處于低壓狀態；將水速調5150rpm后，泵壓頭為1.8MPa，泵處于中壓狀態。由于水泵在某一時刻的轉速的，因此中低壓單級離心泵和兩級離心泵不存在中低壓聯合工況。
The working process is as follows: after the fire truck is started, adjust the speed of the water pump to 4250rpm, the pump head is 1MPa, and the water pump is under low pressure; After the water speed is adjusted to 5150rpm, the pump head is 1.8MPa and the pump is in the medium pressure state. Due to the speed of the water pump at a certain time, the medium and low pressure single-stage centrifugal pump and the two-stage centrifugal pump do not have the combined working condition of medium and low pressure.
中低壓兩級離心泵：
Medium and low pressure two-stage centrifugal pump:
結構類似于低壓兩級離心泵。兩級葉輪串聯在泵室內的一根軸上。形成介質壓力的基本原理是提高泵速或降低流量來改變消防車的運行條件。使電梯達到中壓狀態。
The structure is similar to the low-pressure two-stage centrifugal pump. Two stage impellers are connected in series on a shaft in the pump room. The basic principle of forming medium pressure is to increase the pump speed or reduce the flow to change the operating conditions of the fire truck. Make the elevator reach the medium voltage state.
中低壓串并聯離心泵：
Medium and low pressure series parallel centrifugal pump:
主要由葉輪、泵軸、泵殼、前、中、后蓋、進水閥、換向閥等組成。兩個葉輪各有一個獨立的進水室，二級葉輪的合流出口為始終與泵的出水口相連。腔室連通。這樣，一級葉輪和第二級葉輪可以串聯或并聯供水。
It is mainly composed of impeller, pump shaft, pump casing, front, middle and rear covers, water inlet valve, reversing valve, etc. The two impellers each have an independent water inlet chamber, and the confluence outlet of the second stage impeller is always connected with the water outlet of the pump. The chamber is connected. In this way, the first stage impeller and the second stage impeller can supply water in series or in parallel.
切換閥和進水閥是消防車中低壓離心泵的兩個關鍵環節。當切換閥處于串聯位置時，初級葉輪的壓力水進入次級葉輪的進水腔，閥門在壓力作用下關閉。將泵置于串聯供水狀態。當切換閥處于平行位置時，一級葉輪和二級葉輪同時從吸水管吸水，閥門負壓開啟，兩葉輪處于平行狀態供水。
Switching valve and water inlet valve are two key links of low-pressure centrifugal pump in fire truck. When the change-over valve is in the series position, the pressure water of the primary impeller enters the water inlet chamber of the secondary impeller, and the valve is closed under pressure. Put the pump in series water supply. When the switching valve is in the parallel position, the first stage impeller and the second stage impeller absorb water from the suction pipe at the same time, the valve is opened under negative pressure, and the two impellers are in the parallel position?? Status water supply.
在泵的中蓋上安裝有水環導流泵，以滿足低壓泵排氣導流的要求。
A water ring diversion pump is installed on the middle cover of the pump to meet the requirements of exhaust diversion of the low-pressure pump.
中低壓系列離心泵：
Medium and low pressure series centrifugal pump:
川消中低壓系列離心泵由兩個獨立的泵室組成，一個是低壓泵室，一個是中壓泵室。進入中壓泵，冷卻軸封裝置，在中壓泵室和低壓??泵室之間設置回水管路，使少量液體在低壓泵和中壓泵之間循環，防止泵體過熱，也增加了體積損失。
Chuanxiao medium and low pressure series centrifugal pump consists of two independent pump rooms, one is low pressure pump room and the other is medium pressure pump room. Enter the medium pressure pump, cool the shaft seal device, and install it in the medium pressure pump chamber and the low pressure pump chamber?? The return water pipeline is set between the pump rooms to make a small amount of liquid circulate between the low-pressure pump and the medium-pressure pump, so as to prevent the pump body from overheating and increase the volume loss.
兩個泵室通過配備有中低壓切換閥的導管連接。在低壓工況下，中低壓切換閥關閉，低壓泵工作，中壓泵空轉，形成低壓供水狀態。在中壓工況下，打開中低壓切換閥，低壓離心泵的液流通過導管進入中壓離心泵，由中壓泵再次加壓后從介質中流出壓力出水口。可實現中低壓并用。
The two pump chambers are connected by a conduit equipped with a medium and low pressure switching valve. Under low-pressure conditions, the medium and low-pressure switching valve is closed, the low-pressure pump works, and the medium-pressure pump idles, forming a low-pressure water supply state. Under the medium pressure working condition, open the medium and low pressure switching valve, the liquid flow of the low pressure centrifugal pump enters the medium pressure centrifugal pump through the conduit, and then flows out of the pressure outlet from the medium after being pressurized again by the medium pressure pump. Medium and low voltage can be used simultaneously.
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The above is the content about the four main structure types of medium and low pressure fire pumps. You can follow our website www.cx-fire Com to see more about the use of devices or other aspects.
