CN219345005U - Monitoring device for suction pump - Google Patents

Abstract

A monitoring device for a water suction pump comprises an electric unit (3) and a pressure sensor (5) arranged in a check valve (6), wherein a logic judgment device (33) in the electric unit (3) stores a preset first pressure value and a preset second pressure value in advance, when the pump needs to be started and operates, the logic judgment device is adjusted to be in a first working mode or a second working mode, and the measured value of the pressure sensor is continuously compared with the preset pressure value of the corresponding mode in real time to adjust the lighting state of an indicator lamp so as to prompt a constructor to perform corresponding operation. The monitoring device for the water suction pump has the advantages of simple judgment logic, clear indication, low cost, stability, reliability and wide applicability.

Description

Monitoring device for suction pump

Technical Field

The utility model relates to the technical field of fluid conveying, in particular to a monitoring device for a water suction pump.

Background

Centrifugal pumps are often used in industrial and agricultural production and residential applications to draw water from a pool and deliver it to a water demand. Because the water surface of the water tank is below the installation plane of the centrifugal pump, the centrifugal pump often generates the phenomena of air binding and cavitation. The reason for the air binding of the centrifugal pump is that air exists in the pump body, and the air is not discharged cleanly when the centrifugal pump is started; centrifugal pump cavitation is due to the fact that the pump inlet pressure is too low, which results in the liquid pressure at the impeller inlet being below its vaporization pressure (saturated vapor pressure), so that the liquid begins to vaporize and form bubbles and collapse.

The air-binding and cavitation not only cause larger energy waste, but also have larger damage to the pump, so the air-binding and cavitation should be avoided as much as possible in the operation of the pump. In order to prevent air binding, the suction pump needs to be filled with water before starting, and the water level of the water is at least over the whole impeller area. However, because the pipeline and the pump are generally made of opaque metal or plastic materials, people cannot well judge whether the requirement of the water injection level is met in time in the pump filling process. If the water level of the water injection is insufficient, starting the pump, idling the starting process of the pump, and causing energy waste and damage to the pump; if the water level of the water injection is too high, resources and time are wasted. In addition, in order to prevent cavitation from occurring, it is necessary to ensure that the suction port has a sufficient pressure during the operation of the pump.

In the currently known technical schemes, no good, low-cost and convenient-to-use technical means for monitoring the air-tie and cavitation of the suction pump are available, and the technical means are used for monitoring and prompting the state during the starting and running processes of the pump.

Disclosure of Invention

The utility model aims to provide a monitoring device for a water suction pump, which has low cost, stability, reliability and wide applicability, and is used for monitoring and indicating states in a priming stage and a water suction pump running stage before the water suction pump is started.

The technical scheme adopted for solving the technical problems is as follows:

the utility model provides a monitoring device for a water suction pump, which is arranged on a water conveying pipeline and comprises an electric unit 3 and a pressure sensor 5, wherein the electric unit 3 comprises a storage battery 31, a sampling card 32, a logic judgment device 33, a button 34 and an indicator lamp 35, the pressure sensor 5 and the logic judgment device 33 are respectively and electrically connected with the sampling card 32, the logic judgment device 33 and the indicator lamp 35 are respectively and electrically connected with the storage battery 31, and the button 34 and the indicator lamp 35 are respectively and electrically connected with the logic judgment device 33.

Preferably, the water conveying pipeline comprises an outlet pipeline 1, a pump 2 and an inlet pipeline 4, the inlet pipeline 4 is communicated with the inlet of the pump 2, the outlet pipeline 1 is communicated with the outlet of the pump 2, a check valve 6 is arranged on the inlet pipeline 4, and a pressure sensor 5 is arranged in the check valve 6.

Preferably, the check valve 6 comprises a valve clack 61, a hinge structure 62 and a valve seat 63, the valve seat 63 is provided with a water inlet 64, a water outlet 65 is communicated with the inlet pipeline 4, the valve clack 61 is arranged above the water inlet 64, the valve clack 61 is arranged on the valve seat 63 through the hinge structure 62, and the pressure sensor 5 is arranged at the top of the valve clack 61.

The beneficial effects of the utility model are as follows: the state monitoring and indication are carried out at the priming stage and the water suction pump running stage before the water suction pump is started, the structure is simple, the cost is low, the running is stable and reliable, the judgment logic is simple, the indication is clear, the deployment in various occasions is convenient, and the risk monitoring and indication of the air bearing and the cavitation of the water suction pump can be simultaneously realized.

Drawings

Fig. 1 is a schematic diagram of a construction in which the present utility model is implemented.

Fig. 2 is a schematic electrical connection diagram of each electrical component according to the present utility model, wherein the connection lines represent electrical connection relationships, and the dashed connection lines represent signal transmission and control relationships.

Wherein: 1-an outlet duct; 2-a pump; 3-an electrical unit; 31-a storage battery; 32-sampling card; 33-logic judger;

34-button; 35-indicator lights; 4-inlet piping; 5-a pressure sensor; 6-check valve; 61-valve clack; 62-hinge structure; 63-valve seat; 64-water inlet; 65-water outlet.

Detailed Description

The utility model will be described in further detail with reference to the drawings and examples.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The utility model provides a monitoring device for a water suction pump, referring to fig. 1-2, which is arranged on a water conveying pipeline and comprises an electric unit 3 and a pressure sensor 5, wherein the electric unit 3 comprises a storage battery 31, a sampling card 32, a logic judgment device 33, a button 34 and an indicator lamp 35, the pressure sensor 5 and the logic judgment device 33 are respectively and electrically connected with the sampling card 32, the logic judgment device 33 and the indicator lamp 35 are respectively and electrically connected with the storage battery 31, and the button 34 and the indicator lamp 35 are respectively and electrically connected with the logic judgment device 33. The logic determiner 33 has a first operation mode and a second operation mode, in which a preset first pressure value and second pressure value are stored in advance. The first pressure value corresponds to the pressure difference between the top surface and the bottom surface of the water column between the top of the impeller and the check valve when the whole impeller area is filled with water in the pumping stage; the second pressure value corresponds to the lowest pressure value required at the non-return valve when the pump is operating at maximum flow and cavitation is not occurring. The current mode of operation can be adjusted by means of the button 34. The sampling card 32 collects the pressure measurement value of the pressure sensor 5 in real time and transmits the pressure measurement value to the logic judgment device 33, and the logic judgment device 33 receives the pressure measurement value transmitted by the sampling card 32, compares the pressure measurement value with a corresponding preset value stored in the sampling card according to the current working mode of the sampling card, and controls the indication state of the indicator lamp 35 according to the comparison result. The indicator light 35 has two lighting indicator states, namely a green light and a red light, wherein the green light state in the first working mode indicates that the pump 2 can be started normally, and the red light indicates that pumping needs to be continued; the green light status in the second mode of operation indicates that pump 2 is not at risk of cavitation and the red light indicates that pump 2 is at risk of cavitation. The battery 31 supplies power to each electronic component electrically connected thereto.

Further, the water conveying pipeline comprises an outlet pipeline 1, a pump 2 and an inlet pipeline 4, the inlet pipeline 4 is communicated with the inlet of the pump 2, the outlet pipeline 1 is communicated with the outlet of the pump 2, a check valve 6 is arranged on the inlet pipeline 4, and a pressure sensor 5 is arranged in the check valve 6. The pump 2 is a centrifugal pump, the outlet pipe 1 is above the pump 2, and the inlet pipe 4 is below the pump 2.

Further, the check valve 6 comprises a valve clack 61, a hinge structure 62 and a valve seat 63, the valve seat 63 is provided with a water inlet 64, a water outlet 65 is communicated with the inlet pipeline 4, the valve clack 61 is arranged above the water inlet 64, the valve clack 61 is arranged on the valve seat 63 through the hinge structure 62, and the pressure sensor 5 is arranged at the top of the valve clack 61.

Further, the electrical unit 3 is arranged on the surface of the pump 2 for the operator to observe.

Working principle: when the pump 2 needs priming to be started, the operator puts the logic determiner 33 in the first operating mode via the button 34 and constantly compares in real time the magnitude of the pressure sensor measurement value with the first pressure value: if the measured value is smaller than the first pressure value, the indicator lamp 35 is in a red light state, so that an operator is prompted to continue pumping; if the measured value is greater than the first pressure value, the indicator light 35 is set to a green light state, prompting the operator to end pumping and start the pump 2. When the pump 2 is running, the operator puts the logic determiner 35 into the second operating mode via the button 34 and constantly compares in real time the magnitudes of the pressure sensor measurement value and the second pressure value: if the measured value is smaller than the second pressure value, the indicator lamp 35 is in a red light state, so that an operator is prompted that the pump 2 has cavitation risk, and inspection and precaution are required to be enhanced; if the measured value is greater than the first pressure value, the indicator lamp 35 is set to be in a green light state, so that the pump 2 is not at risk of cavitation.

Specifically, the monitoring device is used for monitoring and indicating the state of the water suction pump of the water storage pool of a certain water treatment plant. According to engineering design data and sample information of a manufacturer, the first pressure value and the second pressure value are respectively set to be 30kPa and 25kPa (both are gauge pressures).

On a certain day, the operator is ready to start the pump 2, and before starting, puts the logic determiner 33 in the first operating mode and continuously fills the inlet pipe 4 and the pump 2 with water via the outlet pipe 1 (connected to the outside atmosphere). Due to the effect of the non-return valve 6, the water does not flow out, but is continuously accumulated in the inlet pipe 4 and the pump 2 and its level is continuously increased. The measured value of the pressure sensor 5 is smaller at the beginning, and the indicator lamp 35 is in a red light state, so that an operator is prompted to continue pumping; when the water injection has gone beyond the impeller area, the measured value of the pressure sensor 5 starts to be larger than the first pressure value, and the indicator lamp 35 is in a green light state, so that an operator is prompted to finish pumping and start the pump 2.

After pump 2 is started, the operator places logic determiner 33 in the second mode of operation via button 34. In the normal operation phase of the pump 2, the indicator light 35 is always in a green light state due to the sufficient pressure at the check valve 6, which indicates that the pump 2 is free from cavitation risk.

It should be noted that, the technical features not described in detail in the above embodiments are all the prior art, and those skilled in the art may make reasonable choices from the prior art to apply to the technical solutions of the present application.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (3)

1. The utility model provides a monitoring devices for suction pump, it sets up on the conduit, characterized by: the intelligent electric power generation device comprises an electric unit (3) and a pressure sensor (5), wherein the electric unit (3) comprises a storage battery (31), a sampling card (32), a logic judgment device (33), a button (34) and an indicator lamp (35), the pressure sensor (5) and the logic judgment device (33) are respectively electrically connected with the sampling card (32), the logic judgment device (33) and the indicator lamp (35) are respectively electrically connected with the storage battery (31), and the button (34) and the indicator lamp (35) are respectively electrically connected with the logic judgment device (33).

2. The monitoring device for a suction pump according to claim 1, wherein: the water delivery pipeline comprises an outlet pipeline (1), a pump (2) and an inlet pipeline (4), wherein the inlet pipeline (4) is communicated with an inlet of the pump (2), the outlet pipeline (1) is communicated with an outlet of the pump (2), a check valve (6) is arranged on the inlet pipeline (4), and a pressure sensor (5) is arranged in the check valve (6).

3. The monitoring device for a suction pump according to claim 2, characterized in that: the check valve (6) comprises a valve clack (61), a hinge structure (62) and a valve seat (63), wherein a water inlet (64), a water outlet (65) and an inlet pipeline (4) are formed in the valve seat (63), the valve clack (61) is arranged above the water inlet (64), the valve clack (61) is arranged on the valve seat (63) through the hinge structure (62), and the pressure sensor (5) is arranged at the top of the valve clack (61).

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