CN210889356U

CN210889356U - Self-priming device of centrifugal pump

Info

Publication number: CN210889356U
Application number: CN201921293124.8U
Authority: CN
Inventors: 刘军; 许海明
Original assignee: JIANGSU WANFENG MARINE EQUIPMENT MANUFACTURING CO LTD
Current assignee: JIANGSU WANFENG MARINE EQUIPMENT MANUFACTURING CO LTD
Priority date: 2019-08-12
Filing date: 2019-08-12
Publication date: 2020-06-30
Anticipated expiration: 2029-08-12

Abstract

The utility model provides a self-priming device of centrifugal pump, its includes the pump body (5) of centrifugal pump, and pump body upper portion is equipped with outlet pipe (4), is equipped with impeller (6) in the pump body, and the one end fixed connection of impeller and pump shaft (9), the other end of pump shaft and the main shaft fixed connection of motor (7), characterized by, the outlet pipe is connected with immersible pump (1) through watering pipe (2), is equipped with check valve (3) on the watering pipe, the single-phase motor of immersible pump is controlled by a controller. The self-priming device of the centrifugal pump has the advantages that the centrifugal pump is conveniently and quickly filled with water through the submersible pump, and the submersible pump automatically stops working after the centrifugal pump normally discharges water.

Description

Self-priming device of centrifugal pump

Technical Field

The invention relates to a self-priming device of a centrifugal pump, which is used for filling water to the centrifugal pump.

Background

Before the centrifugal pump discharges water, the pump body and the water suction pipeline need to be filled with water, so that water can be discharged, manual water filling is time-consuming, labor-consuming and inconvenient, and therefore a self-suction device of the centrifugal pump is needed to be provided for automatically filling water to the centrifugal pump.

Disclosure of Invention

The invention aims to provide a self-priming device of a centrifugal pump, which can automatically fill water into the centrifugal pump.

The technical scheme of the invention is that the self-priming device of the centrifugal pump comprises a pump body 5 of the centrifugal pump, a water outlet pipe 4 is arranged at the upper part of the pump body, an impeller 6 is arranged in the pump body, the impeller is fixedly connected with one end of a pump shaft 9, the other end of the pump shaft 9 is fixedly connected with a main shaft of a motor 7, and the self-priming device is characterized in that the water outlet pipe is connected with a submersible pump 1 through an irrigation pipe 2, a one-way valve 3 is arranged on the irrigation pipe, and a single-phase motor of.

The self-priming device of the centrifugal pump has the advantages that the centrifugal pump is filled with water through the submersible pump, the operation is convenient and quick, and the submersible pump automatically stops working after the centrifugal pump normally discharges water.

Drawings

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

Fig. 2 is a circuit schematic of the controller.

Detailed Description

Specific embodiments of the present invention will now be described with reference to the accompanying drawings.

A self-priming device of a centrifugal pump comprises a pump body 5 of the centrifugal pump, wherein a water outlet pipe 4 is arranged at the upper part of the pump body, a water suction pipe 8 is arranged at the left part of the pump body, an impeller 6 is arranged in the pump body, the impeller is fixedly connected with one end of a pump shaft 9, the other end of the pump shaft is fixedly connected with a main shaft of a motor 7, the motor is arranged on a pump cover 10, and the pump cover is fixedly and hermetically connected with the right end of; the water outlet pipe is connected with a submersible pump 1 through an irrigation pipe 2, a one-way valve 3 is arranged on the irrigation pipe, and a single-phase motor of the submersible pump is controlled by a controller.

The controller is a double-pole switch which is connected in series between the commercial power and the single-phase motor of the submersible pump.

The self-priming device of the centrifugal pump is closed, the submersible pump is placed under water, the double-pole switch is closed, the power supply of the single-phase motor of the submersible pump is switched on, the submersible pump fills water into the centrifugal pump through the water filling pipe, and the double-pole switch is pulled open after the water is filled, so that the water filling is stopped; the function of the one-way valve is to prevent the outlet water from flowing reversely in the irrigation pipe after the centrifugal pump discharges the water.

The controller comprises a double-pole switch K1 and a voltage reducing transformer BK, wherein the upper pile head of the double-pole switch K1 is connected with a single-phase mains supply circuit, the lower pile head of the double-pole switch K1 is connected with the input end of a single-phase motor MD1 of a submersible pump, and the primary coil of the voltage reducing transformer BK is connected with the lower pile head of a double-pole switch K1 in parallel, and the controller is characterized in that the secondary coil of the voltage reducing transformer BK is connected with the input end of a rectifier QL, a conductive electrode 11 hermetically inserted at the upper part of a pump body is connected in series in an output loop of the secondary coil of the voltage reducing transformer BK, the negative pole of the output end of the rectifier QL is grounded, the positive pole of the output end of the rectifier QL is grounded through a resistor R1, an electrolytic capacitor C1 is connected with the resistor R1 in parallel, the positive pole of the output end of the rectifier QL is connected with the inverting input end of a comparator A1 through a resistor R36, the cathode of the diode D1 is connected with the anode of the output end of the rectifier QL, the in-phase input end of the comparator A1 is connected with the sliding arm of the potentiometer W2, one end of the potentiometer W2 is connected with a direct-current stabilized power supply VDD through a resistor R3, the other end of the potentiometer W2 is grounded, the output end of the comparator A1 is connected with the base of the triode T1 through a resistor R4, the emitter of the triode T1 is grounded, the collector of the triode T1 is connected with the direct-current stabilized power supply VDD through a coil J of the direct-current relay, the anode of the diode D2 is connected with the collector of the triode T1, the cathode of the diode D2 is connected with the direct-current stabilized power supply, and the normally-open contact J1 of the direct.

The controller has the working principle that the conductive electrode detects the water level of the pump body, when the pump body is not filled with water or is not filled with water, the rectifier QL does not output a water level voltage signal, the comparator compares the water level voltage signal with a set value, when the water level voltage signal is smaller than the set value, the comparator outputs a high level, the triode T1 is conducted, the coil J of the direct current relay is electrified, the normally open contact of the direct current relay is closed, and the single-phase motor MD1 of the submersible pump rotates in an electrified mode. When the pump body is filled with water, the rectifier QL outputs a water level voltage signal, the comparator compares the water level voltage signal with a set value, at the moment, the water level voltage signal is larger than the set value, the comparator outputs a low level, the triode T1 is cut off, the coil J of the direct current relay is powered off, the normally open contact of the direct current relay is disconnected, and the single-phase motor MD1 of the submersible pump is powered off and stops rotating.

Diode D1, resistor R2, electrolytic capacitor C2 constitute a one-way delay circuit, prevent the interference that the wave flower formed when watering, when the wave flower is excited to the conductance electrode, the output voltage of rectifier QL will increase suddenly, but the voltage on electrolytic capacitor C2 will not break suddenly, will rise gradually to the set point through resistor R2 charging, in the charging process, if the output voltage of rectifier QL will drop suddenly when the wave flower disappears, electrolytic capacitor C2 discharges through diode D1 fast, make the level of comparator output invariable.

The conductive electrode is disposed in the input loop of the rectifier QL, and the voltage applied to the conductive electrode is an alternating current, which prevents polarization.

When the conductive electrode is in a wet state, the rectifier QL will have a smaller voltage output, for which reason the set value should have a larger value to eliminate the effect of the moisture, the set value being regulated by the potentiometer W2.

The conductive electrode comprises two metal columns, the metal columns penetrate through the upper wall of the pump body at intervals, an insulating sealing sleeve is arranged between the metal columns and the pump body, the metal columns can also penetrate through the wall of the water outlet pipe at intervals, and the insulating sealing sleeve is arranged between the metal columns and the water outlet pipe.

When the submersible pump is used, the double-pole switch K1 is turned on, when the pump body is not full of water, the single-phase motor MD1 of the submersible pump rotates, and when the pump body is full of water, the single-phase motor MD1 of the submersible pump automatically stops rotating.

Claims

1. The utility model provides a self-priming device of centrifugal pump, its includes the pump body (5) of centrifugal pump, and pump body upper portion is equipped with outlet pipe (4), is equipped with impeller (6) in the pump body, and the one end fixed connection of impeller and pump shaft (9), the other end of pump shaft and the main shaft fixed connection of motor (7), characterized by, the outlet pipe is connected with immersible pump (1) through watering pipe (2), is equipped with check valve (3) on the watering pipe, the single-phase motor of immersible pump is controlled by a controller.

2. The self-priming apparatus of a centrifugal pump according to claim 1, wherein the controller comprises a double-pole switch K1 and a step-down transformer BK, an upper stub of the double-pole switch K1 is connected with a commercial power circuit, a lower stub of the double-pole switch K1 is connected with an input end of a single-phase motor MD1 of the submersible pump, a primary coil of the step-down transformer BK is connected in parallel with a lower stub of the double-pole switch K1, a secondary coil of the step-down transformer BK is connected with an input end of a rectifier QL, a conductive electrode (11) hermetically inserted in the upper portion of the pump body is connected in series in an output loop of the secondary coil of the step-down transformer BK, a negative electrode of an output end of the rectifier QL is grounded, a positive electrode of an output end of the rectifier QL is grounded through a resistor R1, an electrolytic capacitor C23 is connected in parallel with a resistor R1, a positive electrode of an output end of the rectifier QL is connected with an inverting input end, the inverting input end of the comparator A1 is connected with the anode of the diode D1, the cathode of the diode D1 is connected with the anode of the output end of the rectifier QL, the non-inverting input end of the comparator A1 is connected with the sliding arm of the potentiometer W2, one end of the potentiometer W2 is connected with a direct current stabilized power supply VDD through a resistor R3, the other end of the potentiometer W2 is grounded, the output end of the comparator A1 is connected with the base electrode of a triode T1 through a resistor R4, the emitter electrode of the triode T1 is grounded, the collector electrode of a triode T1 is connected with the direct current stabilized power supply VDD through a coil J of a direct current relay, and a normally open contact J1 of the direct current relay is connected in series with the.