CN106194777B - Pump installation - Google Patents

Abstract

Cavitation caused by it is an object of the invention to provide a kind of suppress because of suction environment and pump-out and the pump installation for improving performance of drawing water, reducing noise and vibration, preventing corrosion.The pump installation, including：Pump unit, having can be by the impeller of motor rotation driving, and has housing, and the housing in a manner of covering the periphery of the impeller to set and form pump chamber by gabarit；Flow sensor, detect the flow of the liquid from pump unit discharge；And pressure sensor, detect the pressure value in pump chamber.

Description

Pump installation

Technical field

The present invention relates to pump installation.

Background technology

The pump that patent document 1 is recorded includes pump unit, the motor for driving pump unit and the control unit for controlling motor, and And it is used to detect the flow switch of the discharge of the liquid, peace from the water flowing road of the flow of fluid of pump unit discharge including being arranged on Pressure sensor on identical water flowing road and the pressurized tank for pressure accumulation.Small water detection signal is produced in flow switch And after small water detection time as defined in maintaining, control unit carries out certain time with defined moulding pressure value to pressurized tank Pressure accumulation, there is the function of stopping motor and pump up dynamic pressure setting value.

Prior art literature

Patent document

Patent document 1：Japanese Unexamined Patent Publication 2005-248899 publications

The content of the invention

Technical problems to be solved are thought in invention

Suction condition as pump, it is desirable to diversified such as in well water source that confession also very stable under environment is set Water, but water level is deep, suction line caliber is thin, cavitation occurs under the conditions of suction line cross directional stretch length etc., because of the efficiency of pump Decline and bubble is mixed into and causes to produce noise and vibration, or even promote corrosion, it is possible to cause to draw water.Patent document 1 Flow switch of record etc., it is impossible to detect the generation of cavitation.

It is an object of the invention to provide one kind suppress because of suction environment and pump-out and caused by cavitation and carry Height draws water performance, the pump that reduces noise and vibration, prevent corrosion.

For solving the means of technical problem

In order to solve technical problem, pump installation of the invention is characterised by, including：Pump unit, having can be electronic The impeller of machine rotation driving, and there is housing, the housing in a manner of covering the periphery of the impeller to set and by gabarit Form pump chamber；Flow sensor, it is arranged on from the water flowing road of the liquid flowing of pump unit discharge, for detecting liquid Flow；And pressure sensor, on identical water flowing road, for detecting the pressure value in pump chamber.

Invention effect

Because including being arranged on from the stream for being used to detect liquid on the water flowing road of the liquid flowing of pump unit discharge The flow sensor of amount and the pressure sensor for being used to detect the pressure value in pump chamber on identical water flowing road, can Detect pump-out and pressure value simultaneously, such as by detecting the hydraulic performance decline that draws water caused by the generation of cavitation, by motor Rotating speed is automatically adjusted to optimum value, so as to solve above-mentioned technical problem.Suppress because of suction environment and take out thereby, it is possible to realize Water and caused cavitation and improve performance of drawing water, reduce noise and vibration, the effect for preventing corrosion.

Brief description of the drawings

Fig. 1 is the stereogram of the pump installation of embodiments of the invention.

Fig. 2 is the figure that pump cover is provided with the pump installation of embodiments of the invention.

Fig. 3 is the performance diagram that draws water (pressure value and pump-out in pump chamber) of the pump installation of embodiments of the invention.

Fig. 4 be the pump installation of embodiments of the invention the performance diagram that draws water (consumption electric power, pump-out, the efficiency of pump and Rotating speed).

Fig. 5 is the side sectional view of the pump installation of embodiments of the invention.

Symbol description

1 motor

2 housings

3 case lids

4 impellers

5 pedestals

6 pressurized tanks

7 pressure sensors

8 flow sensors

9 control controllers

10 display controllers

11 pump covers

15 current

Post occurs for 16 vortex

17 ultrasonic sensors

18 Kalmans are vortexed

20 draw water characteristic curve (not suppressing to cavitation)

21 draw water characteristic curve (having suppression to cavitation)

Point occurs for 23 cavitations

24 maximum (top) speeds

25 optimum speeds

100 pump installations

101 pump units

102 Karman vortex streaming ultrasonic flow sensors

Embodiment

Hereinafter, referring to the drawings, embodiments of the present invention are illustrated.Below, as illustrated, by pump installation 100 The side of pedestal 5 is used as lower section to carry out regulation above-below direction and illustrated.

Fig. 1 is the stereogram from the state after the dismounting pump of pump installation 100 cover 11 of the present invention.Fig. 2 is the pump dress of the present invention Put 100 stereogram.

Pump installation 100 includes pump unit 101, pedestal 5, pressurized tank 6, pressure sensor 7, flow sensor 8 and pump cover 11, Wherein, pump unit 101 includes the case lid on the preceding surface of motor 1, impeller 4, the housing 2 of the built-in impeller 4 and closing housing 2 3。

Pedestal 5 is the part of approximately parallelepiped body shape.Being arranged in the top of pedestal 5 has pressurized tank 6, pressure sensor 7th, flow sensor 8 and pump unit 101, they are fixed on the upper surface of pedestal 5.

Pressurized tank 6 is used to store the water after the pressurization of pump unit 101.

Pressure sensor 7 is arranged on the water flowing road for the liquid flowing discharged from pump unit 101, is to detect the pressure in pump chamber The sensor of force value.

Flow sensor 8 is provided in from the flow of the detection liquid on the water flowing road of the liquid flowing of pump unit discharge Sensor.

The testing result of pressure sensor 7 and the testing result of flow sensor 8 are input into control controller 9, by The Comprehensive Control of controller 9 is used in control, so as to control the starting of pump unit 101 and stopping.

Pump cover 11 is the part of the approximately parallelepiped body concave shape of lower surface opening.Pump cover 11 is free to be installed on pedestal 5 or from its dismounting.This is to be able to operate pump unit 101 and control with controller 9 etc., repaired.

Pump cover 11 covers major part, the pressure of pump unit 101 by being fixed on pedestal 5 between pump cover 11 and pedestal 5 The whole of tank 6, pressure sensor 7 and flow sensor 8.It can be reduced from sound caused by the grade of pump unit 101 using pump cover 11 It is delivered to the misgivings of the outside of pump installation 100.

Then, to caused by the cavitation of pump the problem of, illustrates.

Pump may hair under conditions of the suction lift height such as water level is deep, suction line caliber is thin, suction line cross directional stretch length Raw cavitation.

The cavitation of pump refers to that in the liquid flow of high speed caused by head 101 the great position pressure of flow velocity shows When writing below decline and then saturated vapor pressure, produce steam and the phenomenon in hole is produced in liquid flow.When producing hole, The efficiency of pump declines, and bubble, which is mixed into, to be caused to produce noise and vibration, it could even be possible to can not draw water.

By structure of the invention as described below, realize suppress because of suction environment and caused by cavitation and improve Draw water performance, the effect that reduces noise and vibration, prevent corrosion.

Suppress control to the cavitation carried out using pressure sensor 7 and flow sensor 8 using Fig. 3 to illustrate. Fig. 3 is the performance diagram that draws water (pressure value and pump-out in pump chamber) of the pump installation of embodiments of the invention.Pump draws water Characteristic can be represented with the relation of discharge pressure and pump-out as shown in Figure 3.That is, by with pressure sensor 7 and flow Sensor 8, discharge pressure and pump-out are detected, it is gentle so as to grasp the characteristic curve that draws water (suppressing without cavitation) 20 Point 23 occurs for cave phenomenon.As it was previously stated, cavitation is when the great position pressure of flow velocity is remarkably decreased, i.e., in big yield region Occur.However, the pressure sensor and flow switch of existing structure and control in, can only as stop water 4L/ I.e. 1 point is entered the detection of water-filling amount near minute, so the change of pump-out can not be held, therefore can not detect cavitation and point occurs 23.And in control, maximum (top) speed 24 is maintained, so in order to keep high flow velocity, the generation of cavitation may be caused more To be notable.

Then, the technical scheme for suppressing cavitation is illustrated using Fig. 4.

Due to being sent out when cavitation is and reached when the great position pressure of flow velocity is remarkably decreased below Saturated water vapor pressure Raw, so can be solved reducing rotating speed in a manner of keeping more than saturated vapor pressure.But if simply blindly Rotating speed is reduced, then can cause the decline of pump performance, so having to carry out optimized rotating speed adjustment.In the present embodiment, due to With pressure sensor 7 and flow sensor 8, so can be by holding characteristic of drawing water, and accurately catch cavitation Point 23, is adjusted to optimum speed 25, so as to be changed as the characteristic curve that draws water (suppression that cavitation be present) 21 It is kind.

Then, the mode and its advantage of various flow sensors are illustrated.

As the mode of flow sensor, can substantially be distinguished with either with or without the mechanical movable portion of test section.

There is vane type flow sensor in the sensor that test section has mechanical movable portion, it is set inside water passage There is impeller, detected using the rotating speed of increase and decrease proportional to flow.The structure of vane type flow sensor and control are more Easily, so can manufacture at low cost.

In the sensor that test section does not have mechanical movable portion, have and used the Faraday's law related to electromagnetic induction Electromagnetic flow sensor and Karman vortex streaming ultrasonic flow sensor 102, Karman vortex streaming ultrasonic flow pass As shown in figure 5, configuring vortex on water flowing road post 16 occurs for sensor 102, by making current 15 that post 16 occur to produce by being vortexed Kalman's vortex 18, phase difference is detected using ultrasonic sensor 17.The advantages of the two sensors, can be listed below：Because Test section does not all have mechanical movable portion, causes to block so being not susceptible to foreign matter and being mixed into, water flowing resistance is few.

In the present embodiment, the Kalman's vortex that is mixed into and can be formed cheaply using tolerance foreign matter is shown The example of formula ultrasonic flow sensor 102.As key property, it is wider to enumerate water detection range, reaches 3~60L/ Minute this point, and due to without using electrode so being difficult to the influence this point by temperature and water quality.

Moreover, by carrying flow sensor, there can be following four functions.

One function is can to utilize the function of the real-time display water of display controller 10.

Second function is the function that can add up Water usage and the duration of runs and show accumulative Water usage.

3rd function is by setting water and the variable adjustment function of time in control controller 9 and setting any The function that water and any duration of runs are operated automatically.For example, it can be applied to be used as garden watering pours water or roof In use of snow melt etc..It can be can be achieved with operating automatically after initial setting, therefore can saved daily using this function Access the trouble of power supply.

4th function is can arbitrarily to change the function that pump stops water condition.For example, in underground with tube leakage etc. In the case of pipe arrangement easily can not being repaired, it is adjusted to exceed leak below the 4L/ minutes of initial value by the way that water will be stopped Below the 8L/ minutes of amount, and pump action is changed into intermittent working from continuously running, can expect to save the energy and suppression component mill Damage.

Claims (4)

1. A kind of 1. pump installation, it is characterised in that including：

   Pump unit, having can be by the impeller of motor rotation driving, and has housing, the housing with cover the impeller outside The mode in week sets and forms pump chamber by gabarit；

   Flow sensor, detect the flow of the liquid from pump unit discharge；With

   Pressure sensor, the pressure value in pump chamber is detected,

   Using the flow sensor and the pressure sensor, grasp the pump installation by the flow and the pressure value The characteristic of drawing water that represents of relation in the cavitation that pressure is remarkably decreased that occurs in the great position of flow velocity occur point, and The cavitation occurs at point, and the electricity is reduced in a manner of causing the pressure value in the pump chamber to keep more than saturated vapour pressure The rotating speed of motivation.
2. 2. pump installation as claimed in claim 1, it is characterised in that：

   The flow sensor does not have mechanical movable portion in flow testing division.
3. 3. pump installation as claimed in claim 2, it is characterised in that：

   The flow sensor is ultrasonic wave Karman vortex streaming.
4. 4. pump installation as claimed in claim 1, it is characterised in that：

   The flow sensor has mechanical movable portion in flow testing division.