阅读说明：本技术 电动自吸式消防泵 (Electric self-suction fire pump ) 是由 张风荣 于 2020-12-08 设计创作，主要内容包括：电动自吸式消防泵,它包括离心泵、浮球式水箱、压力开关、水位开关、电磁阀、真空泵和气液分离箱,所述离心泵的吸入口端连接一只浮球式水箱,该浮球式水箱顶部分别安置压力开关、水位开关和电磁阀,所述真空泵安置在离心泵后侧的同一基座上,真空泵与之上竖置的气液分离箱相连通,真空泵的抽气口通过外接管道连接浮球式水箱顶部安置的电磁阀,由此构成助离心泵的自吸通道,所述水位开关的两极介于离心泵控制电路中,在真空泵运行阶段水位开关为断开状,当浮球式水箱内腔液位达到设定高度时水位开关为闭合,离心泵得电而启动,所述压力开关在真空泵运行阶段处于闭合状,当离心泵实现自吸后,浮球式水箱内压升高至设定值时压力开关自动断开,压力开关的断开信号用于控制真空泵和电磁阀断电。(An electric self-priming fire pump comprises a centrifugal pump, a floating ball type water tank, a pressure switch, a water level switch, an electromagnetic valve, a vacuum pump and a gas-liquid separation tank, wherein the suction inlet end of the centrifugal pump is connected with the floating ball type water tank, the top of the floating ball type water tank is respectively provided with the pressure switch, the water level switch and the electromagnetic valve, the vacuum pump is arranged on the same base at the rear side of the centrifugal pump, the vacuum pump is communicated with the gas-liquid separation tank vertically arranged above the vacuum pump, the suction opening of the vacuum pump is connected with the electromagnetic valve arranged at the top of the floating ball type water tank through an external pipeline, so that a self-priming channel of the centrifugal pump is formed, two poles of the water level switch are arranged in a control circuit of the centrifugal pump, the water level switch is in an open state in the operation stage of the vacuum pump, the water level, when the centrifugal pump realizes self-priming, the pressure switch is automatically switched off when the internal pressure of the floating ball type water tank rises to a set value, and the switching-off signal of the pressure switch is used for controlling the vacuum pump and the electromagnetic valve to be powered off.)

1. An electric self-priming fire pump comprises a centrifugal pump (1), a floating ball type water tank (2), a pressure switch (3), a water level switch (4), an electromagnetic valve (5), a vacuum pump (6) and a gas-liquid separation tank (7); the method is characterized in that: the suction inlet end of the centrifugal pump (1) is connected with a floating ball type water tank (2), and the top of the floating ball type water tank (2) is respectively provided with a pressure switch (3), a water level switch (4) and an electromagnetic valve (5); the vacuum pump (6) is arranged on the same base on the rear side of the centrifugal pump (1), the vacuum pump (6) is communicated with a gas-liquid separation box (7) vertically arranged above the vacuum pump, and an air suction opening of the vacuum pump (6) is connected with an electromagnetic valve (5) arranged at the top of the floating ball type water tank (2) through an external pipeline, so that a self-suction channel of the centrifugal pump (1) is formed; the two poles of the water level switch (4) are arranged in a control circuit of the centrifugal pump (1), the water level switch (4) is in an open state in the operation stage of the vacuum pump (6), when the liquid level of the inner cavity of the floating ball type water tank (2) reaches a set height, the water level switch (4) is closed, and the centrifugal pump (1) is powered on and started; the pressure switch (3) is in a closed state in the operation stage of the vacuum pump (6), when the centrifugal pump (1) realizes self-absorption, the pressure switch (3) is automatically switched off when the internal pressure of the floating ball type water tank (2) rises to a set value, and the switching-off signal of the pressure switch (3) is used for controlling the vacuum pump (6) and the electromagnetic valve (5) to be switched off.

2. The electric self-priming fire pump according to claim 1, wherein: the centrifugal pump (1) is a vertical pump.

3. The electric self-priming fire pump according to claim 1, wherein: the water level switch (4) is a floating ball type liquid level switch.

4. The electric self-priming fire pump according to claim 1, wherein: the bottom of the floating ball type water tank (2) and the gas-liquid separation tank (7) is 500-600 mm higher than the highest liquid level of a suction inlet of the centrifugal pump (1).

Technical Field

The invention relates to a water pump, in particular to a fire pump, and particularly relates to an electric self-priming fire pump suitable for being matched with a ship.

Background

The fire pump belongs to an emergency pump device, and the pump device is special in application occasions, so that the quality assessment indexes of the fire pump are mainly initial water outlet time and hydraulic performances such as pump lift, flow and the like. The centrifugal pump belongs to general class product, and technology is mature, simple structure, use convenient and fast and the operation is reliable, is particularly suitable for as the main part pump of fire pump. The self-priming capability of the fire pump directly determines the initial water outlet time, and the centrifugal pump does not have the self-priming capability, so that the self-priming fire pump can be formed only by adding a self-priming device on the basis of the centrifugal pump. At present, although the variety of commercially available fire pumps is very large, self-priming devices matched with centrifugal pumps are roughly divided into three types of structures. The first structure adopts an injection pump, and realizes self-suction by utilizing the siphon effect generated when compressed air passes through the injection pump at high speed; the second structure is that the centrifugal pump is coaxially linked with a matched vacuum pump and is assisted by the vacuum pump to self-suck; the third type of structure is a self-contained valve-controlled water storage tank which is self-priming by a filling water assisted centrifugal pump at the starting stage. Although the three self-suction structures can achieve the expectation, the operation process is not perfect and is more or less deficient. For example, the first type of structure is limited in its application to locations where compressed air connections are provided, and otherwise it is inoperable. The second structure is coaxial with the vacuum pump, so that two different functions of the pump which should be operated separately are coaxially linked, and the generated invalid operation not only increases energy consumption and reduces efficiency, but also generates unnecessary abrasion, and the abrasion reduces the service life of the matched equipment. The third type of self-provided valve-controlled water storage tank is large in volume and is not suitable for ship matching.

Disclosure of Invention

The invention mainly aims at the defects of the prior art and provides the electric self-suction fire pump which is simple in structure, reasonable in configuration, high in automation degree, reliable in action and quick in initial water outlet time. The pump is directly applied with electric energy, has wide application range and is particularly suitable for being matched with ships.

The invention achieves the technical aim through the following technical scheme.

An electric self-suction fire pump comprises a centrifugal pump, a floating ball type water tank, a pressure switch, a water level switch, an electromagnetic valve, a vacuum pump and a gas-liquid separation tank. The improvement is that: the suction inlet end of the centrifugal pump is connected with a floating ball type water tank, and the top of the floating ball type water tank is respectively provided with a pressure switch, a water level switch and an electromagnetic valve. The vacuum pump is arranged on the same base at the rear side of the centrifugal pump and is communicated with the gas-liquid separation box vertically arranged above the vacuum pump, and the pumping hole of the vacuum pump is connected with the electromagnetic valve arranged at the top of the floating ball type water tank through an external pipeline, so that a self-suction channel of the centrifugal pump is formed. The two poles of the water level switch are arranged in a control circuit of the centrifugal pump, the water level switch is in an open state in the operation stage of the vacuum pump, the water level switch is closed when the liquid level in the inner cavity of the floating ball type water tank reaches a set height, and the centrifugal pump is powered on and started. The pressure switch is arranged at

The vacuum pump is in a closed state in the operation stage, after the centrifugal pump realizes self-absorption, the pressure switch is automatically switched off when the internal pressure of the floating ball type water tank rises to a set value, and the switching-off signal of the pressure switch is used for controlling the vacuum pump and the electromagnetic valve to be powered off.

The centrifugal pump in the structure is a vertical pump, and the water level switch is a floating ball type liquid level switch.

The bottom of the floating ball type water tank and the gas-liquid separation tank in the structure is 500-600 mm higher than the highest liquid level of a suction inlet of the centrifugal pump.

Compared with the prior art, the invention has the following positive effects:

1. the self-priming structure of the vacuum pump assisted centrifugal pump is simple, the operation is reliable, and the initial water outlet time only needs 60-90 s;

2. the vacuum pump operates independently before the self-priming stage of the centrifugal pump, once the centrifugal pump realizes self-priming, the vacuum pump stops operating, and the respective operation reduces unnecessary wear and saves energy consumption;

3. the circuits of the vacuum pump and the centrifugal pump are respectively controlled by a water level switch, a pressure switch and an electromagnetic valve, the automation degree is high, and manual guard is not needed in the working process.

Drawings

FIG. 1 is a schematic diagram of the present invention.

Fig. 2 is a side view of fig. 1.

Detailed Description

The invention is further explained below with reference to the figures and with reference to the examples.

The electric self-priming fire pump shown in fig. 1 comprises a centrifugal pump 1, a floating ball type water tank 2, a pressure switch 3, a water level switch 4, an electromagnetic valve 5, a vacuum pump 6 and a gas-liquid separation tank 7. The centrifugal pump 1 applied in the embodiment is a vertical pump, a floating ball type water tank 2 is connected to a suction inlet end of the centrifugal pump 1, the floating ball type water tank 2 is a vertically arranged rectangular tank body according to the overall structure, and a pressure switch 3, a water level switch 4 and an electromagnetic valve 5 are respectively arranged at the top of the tank body. The vacuum pump 6 is arranged on the same base on the rear side of the centrifugal pump 1, the vacuum pump 6 is communicated with a gas-liquid separation box 7 vertically arranged above the vacuum pump 6, and an air suction opening of the vacuum pump 6 is connected with the electromagnetic valve 5 arranged on the top of the floating ball type water tank 2 through an external connecting pipe, so that a self-suction channel of the centrifugal pump 1 assisted by the vacuum pump 6 is formed. The floating ball type water tank 2 and the gas-liquid separation tank 7 are both containers, so that a built-in medium can smoothly flow, the installation positions of the floating ball type water tank 2 and the gas-liquid separation tank 7 are higher than the highest liquid level of a suction inlet of the centrifugal pump 1, and the tank bottom of the floating ball type water tank 2 and the gas-liquid separation tank 7 is higher than the highest liquid level of the suction inlet of the centrifugal pump 1 by 500mm in the embodiment. The water level switch 4 is a floating ball type liquid level switch, two poles of the water level switch 4 are arranged in a control circuit of the centrifugal pump 1, and the water level switch 4 is in an off state at the operation stage of the vacuum pump 6, namely the centrifugal pump 1 does not operate. Under the action of exhaust and water diversion of the vacuum pump 6, the inner cavities of the centrifugal pump 1 and the floating ball type water tank 2 are gradually filled with water, when the liquid level of the inner cavity of the floating ball type water tank 2 reaches a set height, the water level switch 4 is closed, and the centrifugal pump 1 is electrified and started. Therefore, the suction inlet and the inner cavity of the centrifugal pump 1 are filled with water in the stage, and the centrifugal pump 1 can quickly realize self-suction after being started, thereby realizing continuous output. In the present embodiment, the head H is 30m, the flow Q is 300T/H, and the initial water outlet time is only 70s because the specification is centered. The pressure switch 3 is also a control switch in the circuit, which is closed during the operation of the vacuum pump 6

And in a closed state, after the centrifugal pump 1 realizes self-priming, working pressure is quickly established, so that the internal pressure of the floating ball type water tank 2 is increased, the pressure switch 3 is automatically switched off when the internal pressure reaches a set value, and a switching-off signal of the pressure switch 3 is used for controlling the vacuum pump 6 and the electromagnetic valve 5 to be powered off, so that the vacuum pump 6 stops running, the self-priming running of the centrifugal pump 1 is temporarily stopped, and the electromagnetic valve 5 which is synchronously powered off also closes an air suction port of the vacuum pump 6.

When the fire-fighting emergency starting device is actually used, a series of actions after the vacuum pump 6 is operated are automatically realized only by pressing the starting button of the vacuum pump 6, manual watching is not needed in the working process, and the fire-fighting emergency starting device completely meets the fire-fighting emergency requirement.