A fully automatic control system for a pump and a pump using the system

Abstract

The present invention belongs to the technical field of water pumps, and particularly relates to a fully automatic control system for pumps and a pump using the system. It includes the following steps: Step 1: Built-in flow-head curve, flow-power curve, and flow-efficiency curve, set the pipeline pressure value p0, set the pressure maintaining value p set , set the pressure percentage α, and set the pressure drop value Δp0 per hour; Step 2: The pressure sensor monitors the pipeline pressure in real time to obtain the current pressure value p, the magnetic induction element monitors the magnet position of the solenoid valve in real time to obtain the current pipeline flow value Q, monitors the motor input power value W in real time, and monitors the efficiency value η in real time; Step 3: Judge the usage state of the water pump and make adjustments. The present invention is not easily failed or misjudged, and can achieve constant pressure operation and micro-leakage shutdown.

Description

Technical Field

[0001] The present invention belongs to the technical field of water pumps, and particularly relates to a fully automatic control system for pumps and a pump using the system. Background Art

[0002] Submersible pumps are important equipment for pumping water from deep wells. When in use, the entire unit works underwater, extracting groundwater to the ground surface for domestic water use, mine rescue, industrial cooling, farmland irrigation, seawater lifting, ship ballasting, etc.

[0003] Chinese Invention Patent (Publication No. CN102678505A, Application Date: May 19, 2012, Publication Date: September 19, 2012) discloses an automatic well pump. The lower part of the hollow shell is provided with a water inlet end, and an electric motor is arranged in the inner cavity. An electric control box with a water outlet is arranged in the shell and fixedly connected to the upper part of the shell. The specific structure of the electric control box is as follows: a water outlet section communicating with the water inlet end is arranged at the bottom of the shell body. An independent microswitch installation chamber and a solenoid valve installation chamber are arranged in the shell body. The microswitch is arranged in the microswitch installation chamber, and the solenoid valve is arranged in the solenoid valve installation chamber. Channels communicating with the microswitch installation chamber and the solenoid valve installation chamber are arranged on the water outlet section. The microswitch is arranged on the circuit board, and the microswitch can move up and down along the limit slideway on the circuit board to control the start and stop of the motor. The solenoid valve installation chamber is connected to the water outlet, and the opening and closing of the solenoid valve control the communication or closure between the water outlet and the water inlet end. After the water pump is powered on, the water pump starts to operate, and the water flushes open the solenoid valve. When the water outlet of the water pump is closed, the solenoid valve closes under the state of water pressure balance, and when the water pressure in the pump body reaches the pressure set by the microswitch, the microswitch is turned on and the water pump stops operating. When the water outlet of the water pump is opened, when the pressure in the water pump drops to the pressure set by the microswitch, the microswitch is turned off and the water pump starts to operate. When the water pump runs without water, the microswitch is closed, the solenoid valve is closed, and the power supply is cut off after the water pump starts and stops six times.

[0004] The deficiencies of the above automatic well pump are as follows: 1. The microswitch is reset by a spring piece or a spring, and the spring piece and the spring are prone to failure, which may lead to misjudgment of the water pump; 2. It is impossible to achieve constant pressure operation of the water pump; 3. It is impossible to judge whether there is a micro-leakage in the water pump, and stop the machine after judging that there is a micro-leakage in the water pump. Summary of the Invention

[0005] The purpose of the present invention is to provide a fully automatic control system for pumps and a pump using the system, which is not prone to failure and misjudgment, and can achieve constant pressure operation and micro-leakage shutdown.

[0006] The purpose of the present invention is achieved as follows:

[0007] One of the purposes of the present invention is to provide a fully automatic control system for pumps, including the following steps:

[0008] Step 1: Built-in flow-head curve, flow-power curve, and flow-efficiency curve. Set the pipeline pressure value p0, the pressure holding value p set , set the pressure percentage α, and set the hourly pressure drop value Δp0;

[0009] Step 2: The pressure sensor monitors the pipeline pressure in real time to obtain the current pressure value p, the magnetic induction element monitors the magnet position of the solenoid valve in real time to obtain the current pipeline flow value Q, monitors the motor input power value W in real time, and monitors the efficiency value η in real time;

[0010] Step 3: Judge the usage status of the water pump and make adjustments:

[0011] When the efficiency value η is lower than the efficiency corresponding to the current pipeline flow value Q in the flow-efficiency curve, increase the motor speed to achieve operation at the optimal working point;

[0012] When the pressure sensor detects that the current pressure value p is zero and the motor input power value W is less than 1 / 2 of the power when the flow is zero in the flow-power curve, it is judged that there is a lack of water and the machine stops;

[0013] When the pressure sensor detects that the current pressure value p is greater than the pipeline pressure value p0, reduce the motor speed, the pressure in the water inlet chamber decreases, the valve body of the solenoid valve moves downward to reduce the water outlet channel, the pressure in the water outlet chamber decreases, and because the pressure reduction speed in the water outlet chamber is greater than the pressure reduction speed in the water inlet chamber, the water pressure moves the valve body of the solenoid valve upward to increase the water outlet channel until the valve body is in the balanced position; when the pressure sensor detects that the current pressure value p is less than the pipeline pressure value p0, increase the motor speed, the pressure in the water inlet chamber increases, the valve body of the solenoid valve moves upward to increase the water outlet channel, the pressure in the water outlet chamber increases, and because the pressure increase speed in the water outlet chamber is greater than the pressure increase speed in the water inlet chamber, the water pressure moves the valve body of the solenoid valve downward to reduce the water outlet channel until the valve body is in the balanced position to achieve constant pressure operation;

[0014] When the pressure sensor detects that the current pressure value p is greater than or equal to the pressure holding value p set , and the solenoid valve closes the water outlet channel, it is judged that the water pump is in the pressure holding state and the motor is shut down;

[0015] When the water pump is in the pressure holding state and the pressure sensor detects that the current pressure value p is less than or equal to the product of the pressure holding value p set and the pressure percentage α, start the motor and shut down the motor when the current pressure value p is equal to the pressure holding value p set ;

[0016] When the water pump is in the pressure holding state, calculate the actual hourly pressure drop value Δp. When the actual hourly pressure drop value Δp is greater than the hourly pressure drop value Δp0, it is judged that the water pump has a micro-leakage and the machine stops.

[0017] In the above-mentioned fully automatic control system for a pump, the motor input power value W can be obtained by multiplying the motor input current and voltage, or can be detected by a power sensor connected to the motor.

[0018] In the above-mentioned fully automatic control system for a pump, the motor efficiency is the ratio of the motor output power to the input power, and the hydraulic component efficiency of the pump is the ratio of the pump output power to the pump shaft power. The efficiency value η is obtained by multiplying the hydraulic component efficiency of the pump and the motor efficiency.

[0019] In the above-mentioned fully automatic control system for a pump, between step two and step three, there is also step A: debugging the water pump, and adjusting the flow-head curve, flow-power curve, and flow-efficiency curve through the current pressure value p, the current pipeline flow value Q, and the motor input power value W.

[0020] Another object of the present invention is to provide a pump using the above-mentioned fully automatic control system for a pump, including a housing, a water inlet section, a hydraulic component, a motor, and a control box. The water inlet section is arranged at the bottom of the housing, the control box is arranged at the upper part of the housing, the hydraulic component and the motor are arranged inside the housing and are located between the control box and the water inlet section. The hydraulic component is driven by the motor. The control box includes a control barrel, a water outlet section arranged at the bottom of the control barrel, and a control board arranged inside the control barrel. The motor is controlled by the control board. A valve body installation cavity communicating with the water outlet section and the water outlet is arranged inside the control barrel. An electromagnetic valve is slidably arranged in the valve body installation cavity. The valve body installation cavity includes a water inlet cavity communicating with the water outlet section, a water outlet cavity communicating with the water outlet, and a water outlet channel communicating the water inlet cavity and the water outlet cavity. The electromagnetic valve includes a valve body for blocking and opening the water outlet channel, a magnet arranged on the valve body, and a spring for resetting the valve body to the side of the water outlet section. A magnetic induction element for sensing the position of the magnet and a pressure sensor for detecting the pressure in the water outlet cavity are also arranged inside the control barrel. The magnetic induction element and the pressure sensor are respectively electrically connected to the control board.

[0021] In the above-mentioned pump, the magnetic induction element is a Hall sensor, a magnetoresistor, or an inductive sensor.

[0022] In the above-mentioned pump, the hydraulic component includes an impeller, a guide vane, and a cover plate, and multiple impellers, guide vanes, and cover plates are provided.

[0023] In the above-mentioned pump, a top cover is arranged above the control barrel, and the water outlet is arranged on the top cover.

[0024] In the above-mentioned pump, multiple vertical reinforcing ribs and multiple horizontal reinforcing ribs are arranged at intervals on the outer side wall of the control barrel, and a stainless steel inlay ring is sleeved at the bottom of the control barrel.

[0025] In one of the pumps described above, an O-ring sleeved outside the water outlet section is provided between the control barrel and the water outlet section.

[0026] In one of the pumps described above, the vertical reinforcing ribs are evenly distributed circumferentially on the outer side wall of the control barrel, and the distance between adjacent two transverse reinforcing ribs is the same.

[0027] In one of the pumps described above, the valve body includes a stepped cylindrical body, the diameters of the upper, middle, and lower parts of the body decrease in sequence, a sealing ring for sealing and opening the water outlet channel is sleeved in the middle of the body, a positioning part is provided on the outer periphery of the lower part, the upper surface and the lower surface of the positioning part are inclined gradually from the body to the middle, a base is provided below the body, and connecting bars for connecting the body and the base are provided. A plurality of the connecting bars are evenly distributed circumferentially and are inclined gradually from bottom to top to the middle, and the base is annular.

[0028] In one of the pumps described above, a flow guiding column located in the middle of a plurality of connecting bars is provided below the body. The flow guiding column includes a cylindrical main body and a plurality of flow guiding bars evenly distributed circumferentially on the outer periphery of the main body. The thickness of the flow guiding bars increases gradually from bottom to top, and an annular groove surrounding the flow guiding column is formed by concave formation on the lower surface of the body.

[0029] In one of the pumps described above, the magnet is arranged on the upper part of the body and is an annular structure coaxially arranged with the body, and the material of the magnet is ferrite.

[0030] In one of the pumps described above, the ferrite is nickel ferrite, cobalt ferrite or manganese ferrite.

[0031] In one of the pumps described above, a power jack electrically connected to the control board is further included, and the power jack is detachably connected to an external modifier.

[0032] The prominent and beneficial technical effects of the present invention compared with the prior art are as follows:

[0033] 1. The present invention monitors the pipeline pressure in real time through a pressure sensor, is not prone to failure, and comprehensively judges whether there is a water shortage situation by combining with the built-in curve, and there will be no misjudgment of water shortage caused by the pipeline having no pressure when the water outlet valve is fully opened; the present invention adjusts the operation at the optimal working point according to the built-in curve, has high operation efficiency, saves electricity, and has a long service life of the water pump; the pipeline pressure is monitored in real time through a pressure sensor, and constant pressure operation is realized through a motor and a solenoid valve; pressure maintaining, pressure supplementing, and micro-leakage shutdown are realized through a pressure sensor and a solenoid valve, effectively preventing losses caused by excessive leakage.

[0034] 2. On the outer side wall of the control barrel of the present invention, a plurality of vertical reinforcing ribs and a plurality of horizontal reinforcing ribs are provided at intervals. A stainless steel inlay ring is sleeved on the bottom of the control barrel, which can effectively prevent the control barrel from deforming due to excessive pressure, enhance the overall sealing effect of the water pump, strengthen the water pressure bearing capacity of the water pump, and increase the diving depth.

[0035] 3. A flow guiding column is provided below the body of the present invention, which can effectively reduce the formation of eddy currents and avoid the vibration of the solenoid valve caused by eddy currents. A circular groove is concavely formed on the lower surface of the body and surrounds the outer circumference of the flow guiding column. The water flow first rushes into the circular groove to reduce the water flow speed and avoid the vibration caused by the impact of the water flow. Description of the Drawings

[0036] Figure 1 is the control flow chart of the present invention;

[0037] Figure 2 is the curve graph of the present invention;

[0038] Figure 3 is the cross-sectional view of the present invention;

[0039] Figure 4 is the cross-sectional view of the present invention from another angle;

[0040] Figure 5 is the front view of the present invention without a housing;

[0041] Figure 6 is the three-dimensional view of the solenoid valve of the present invention;

[0042] Figure 7 is the bottom view of the solenoid valve of the present invention.

[0043] Reference Signs: 1. Housing; 2. Control Barrel; 3. Outlet Joint; 4. Control Board; 5. Outlet; 6. Valve Body Installation Cavity; 6a. Inlet Cavity; 6b. Outlet Cavity; 6c. Outlet Channel; 7. Solenoid Valve; 7a. Valve Body; 7a1. Body; 7a2. Positioning Portion; 7a3. Base; 7a4. Connecting Bar; 7b. Magnet; 7c. Spring; 7d. Sealing Ring; 7e. Flow Guiding Column; 7e1. Main Body; 7e2. Flow Guiding Strip; 8. Pressure Sensor; 9. Vertical Reinforcing Rib; 10. Horizontal Reinforcing Rib; 11. Stainless Steel Inlay Ring; 12. Circular Groove; 13. Top Cover; 14. O-ring. Detailed Embodiments

[0044] The following further describes the present invention with specific embodiments in conjunction with the drawings, see Figure 1 —7:

[0045] One of the purposes of the present invention is to provide a fully automatic control system for a pump, including the following steps:

[0046] Step 1: Build in the flow - head curve, flow - power curve, and flow - efficiency curve. Set the pipeline pressure value p0, the pressure - maintaining pressure value p set , set the pressure percentage α, and set the pressure drop value per hour Δp0;

[0047] Step 2: The pressure sensor monitors the pipeline pressure in real - time to obtain the current pressure value p, the magnetic induction element monitors the magnet position of the solenoid valve in real - time to obtain the current pipeline flow value Q, monitors the motor input power value W in real - time, and monitors the efficiency value η in real - time;

[0048] Step 3: Judge the usage status of the water pump and make adjustments:

[0049] When the efficiency value η is lower than the efficiency corresponding to the current pipeline flow value Q in the flow - efficiency curve, increase the motor speed to achieve operation at the optimal working point;

[0050] When the pressure sensor detects that the current pressure value p is zero and the motor input power value W is less than 1 / 2 of the power when the flow is zero in the flow - power curve, it is judged that there is a lack of water and the machine stops;

[0051] When the pressure sensor detects that the current pressure value p is greater than the pipeline pressure value p0, reduce the motor speed. The pressure in the water inlet chamber decreases, the valve body of the solenoid valve moves downward to reduce the water outlet channel, and the pressure in the water outlet chamber decreases. Since the pressure reduction speed in the water outlet chamber is greater than that in the water inlet chamber, the water pressure moves the valve body of the solenoid valve upward to increase the water outlet channel until the valve body is in the equilibrium position; when the pressure sensor detects that the current pressure value p is less than the pipeline pressure value p0, increase the motor speed. The pressure in the water inlet chamber increases, the valve body of the solenoid valve moves upward to increase the water outlet channel, and the pressure in the water outlet chamber increases. Since the pressure increase speed in the water outlet chamber is greater than that in the water inlet chamber, the water pressure moves the valve body of the solenoid valve downward to reduce the water outlet channel until the valve body is in the equilibrium position, realizing constant - pressure operation;

[0052] When the pressure sensor detects that the current pressure value p is greater than or equal to the pressure - maintaining pressure value p set , and the solenoid valve closes the water outlet channel, it is judged that the water pump is in the pressure - maintaining state and the motor is shut down;

[0053] When the water pump is in the pressure - maintaining state and the pressure sensor detects that the current pressure value p is less than or equal to the product of the pressure - maintaining pressure value p set and the pressure percentage α, start the motor and shut down the motor when the current pressure value p is equal to the pressure - maintaining pressure value p set ;

[0054] When the water pump is in the pressure - maintaining state, calculate the actual pressure drop value per hour Δp. When the actual pressure drop value per hour Δp is greater than the pressure drop value per hour Δp0, it is judged that there is a micro - leakage in the water pump and the machine stops.

[0055] Figure 2 Among them, the abscissa represents the flow rate. The curve that gradually rises as the flow rate increases is the flow rate - power curve. The curve that gradually decreases as the flow rate increases is the flow rate - head curve. The curve that first gradually rises and then decreases as the flow rate increases is the flow rate - efficiency curve.

[0056] As Figure 1 、 2 shown, the present invention monitors the pipeline pressure in real time through a pressure sensor, which is not easily failed. And by combining the built - in curves, it comprehensively judges whether there is a water shortage situation, and there will be no misjudgment of water shortage caused by the pipeline having no pressure when the outlet valve is fully open. The present invention adjusts the operation at the optimal working point according to the built - in curves, has high operating efficiency, saves electricity, and has a long service life of the water pump. It monitors the pipeline pressure in real time through a pressure sensor, and realizes constant pressure operation through the motor and the solenoid valve. It realizes pressure maintenance, pressure compensation, and micro - leakage shutdown through the pressure sensor and the solenoid valve, effectively preventing losses caused by excessive leakage.

[0057] In this embodiment, the pressure percentage α is 80%.

[0058] Furthermore, the motor input power value W is obtained by multiplying the motor input current and voltage.

[0059] Furthermore, the motor efficiency is the ratio of the motor output power to the input power, and the hydraulic component efficiency of the pump is the ratio of the pump output power to the pump shaft power. The efficiency value η is obtained by multiplying the hydraulic component efficiency of the pump and the motor efficiency.

[0060] In order to better adapt the curve graph to each water pump and achieve self - adaptation, there is also a step A between step two and step three: debugging the water pump, and adjusting the flow rate - head curve, the flow rate - power curve, and the flow rate - efficiency curve through the current pressure value p, the current pipeline flow rate value Q, and the motor input power value W.

[0061] Another object of the present invention is to provide a pump using the above - mentioned full - automatic control system for pumps, such as Figure 3 、 4As shown, it includes a housing 1, a water inlet section, a hydraulic component, a motor, and a control box. The water inlet section is arranged at the bottom of the housing 1, the control box is arranged at the upper part of the housing 1, the hydraulic component and the motor are arranged inside the housing 1 and are located between the control box and the water inlet section. The hydraulic component is driven by the motor. The control box includes a control barrel 2, a water outlet section 3 arranged at the bottom of the control barrel 2, and a control board 4 arranged inside the control barrel 2. The motor is controlled by the control board 4. A valve body installation cavity 6 communicating the water outlet section 3 and a water outlet 5 is provided inside the control barrel 2. A solenoid valve 7 is slidably arranged inside the valve body installation cavity 6. The valve body installation cavity 6 includes a water inlet cavity 6a communicating with the water outlet section 3, a water outlet cavity 6b communicating with the water outlet 5, and a water outlet channel 6c communicating the water inlet cavity 6a and the water outlet cavity 6b. The solenoid valve 7 includes a valve body 7a for blocking and opening the water outlet channel 6c, a magnet 7b arranged on the valve body 7a, and a spring 7c for resetting the valve body 7a to the side of the water outlet section 3. A magnetic induction element for sensing the position of the magnet 7b and a pressure sensor 8 for detecting the pressure of the water outlet cavity 6b are also provided inside the control barrel 2. The magnetic induction element and the pressure sensor 8 are respectively electrically connected to the control board 4.

[0062] Figure 3 In the figure, the arrow direction is the water flow direction.

[0063] After the water pump operates, the water flow impacts the valve body 7a upwards. The valve body 7a compresses the spring 7c and moves upwards to open the water outlet channel 6c. The water flows through the water outlet channel 6c, the water outlet cavity 6b, and the water outlet 5 to the pipeline. Since the water outlet cavity 6b is the same as the pipeline, the pressure sensor 8 detects the pressure of the water outlet cavity 6b, that is, detects the pipeline pressure.

[0064] Such as Figure 4 As shown, when the magnetic induction element detects that the magnet 7b of the solenoid valve 7 is at the lowest point, it is determined that the solenoid valve 7 closes the water outlet channel 6c.

[0065] Such as Figure 3 As shown, when the magnetic induction element detects that the magnet 7b of the solenoid valve 7 is at the highest point, it is determined that the solenoid valve 7 fully opens the water outlet channel 6c.

[0066] The control board 4 calculates the current pipeline flow value Q based on the position of the magnet 7b monitored by the magnetic induction element and in combination with the current pressure value p monitored by the sensor.

[0067] When the pressure sensor detects that the current pressure value p is greater than the pipeline pressure value p0, the control board 4 reduces the motor speed. The pressure in the water inlet cavity 6a decreases. The valve body 7a of the solenoid valve 7 moves downwards to reduce the water outlet channel 6c. The pressure in the water outlet cavity 6b decreases. Since the pressure reduction speed of the water outlet cavity 6b is greater than the pressure reduction speed of the water inlet cavity 6a, the water pressure moves the valve body 7a of the solenoid valve 7 upwards to increase the water outlet channel 6c until the valve body 7a is in a balanced position.

[0068] When the pressure sensor detects that the current pressure value p is less than the pipeline pressure value p0, the control board 4 increases the motor speed, the pressure in the water inlet chamber 6a increases, the valve body 7a of the solenoid valve 7 moves upward to increase the water outlet channel 6c, and the pressure in the water outlet chamber 6b increases. Since the pressure increase speed in the water outlet chamber 6b is greater than that in the water inlet chamber 6a, the water pressure moves the valve body 7a of the solenoid valve 7 downward to decrease the water outlet channel 6c until the valve body 7a is in the equilibrium position.

[0069] Further, the magnetic induction element is a Hall sensor, a magnetoresistor or an inductive sensor. In this embodiment, the magnetic induction element is a Hall sensor.

[0070] Further, the structure of the hydraulic component: The hydraulic component includes an impeller, a guide vane and a cover plate, and a plurality of impellers, guide vanes and cover plates are provided.

[0071] Further, a top cover 13 is provided above the control barrel 2, and the water outlet 5 is arranged on the top cover 13.

[0072] Further, an O-ring 14 sleeved outside the water outlet joint 3 is provided between the control barrel 2 and the water outlet joint 3.

[0073] To enhance the water pump's ability to bear water pressure, increase the diving depth and strengthen the sealing effect, as Figure 3-5 shown, a plurality of vertical reinforcing ribs 9 and a plurality of horizontal reinforcing ribs 10 are arranged at intervals on the outer side wall of the control barrel 2. A stainless steel inlay ring 11 is sleeved at the bottom of the control barrel 2, which can effectively prevent the control barrel 2 from deforming due to excessive pressure and can enhance the overall sealing effect of the water pump.

[0074] Preferably, the vertical reinforcing ribs 9 are evenly distributed in a circumferential direction on the outer side wall of the control barrel 2, and the distance between adjacent two horizontal reinforcing ribs 10 is the same. In this embodiment, 12 vertical reinforcing ribs 9 are evenly distributed in a circumferential direction on the outer side wall of the control barrel 2, and 3 horizontal reinforcing ribs 10 are arranged at intervals. Through the finite element analysis of SolidWorks Slmulation, before optimization, the control barrel 2 can bear the ultimate space pressure of 1.911 Mpa, and after optimization, the control barrel 2 can bear the ultimate space pressure of 4.066 Mpa, and no uneven deformation occurs as a whole.

[0075] After the water pump starts to operate, a pressure greater than or equal to 1.5 Mpa will appear between the housing 1 and the control barrel 2. The pressure impacts the housing 1 and the control barrel 2 at the same time. The control barrel 2 has the compressive capacity of the ultimate 4.066 Mpa. The stainless steel inlay ring 11 can effectively prevent the control barrel 2 from deforming irregularly, thereby avoiding the leakage caused by the reduction of the compression amount of the O-ring 14 due to deformation.

[0076] The structure of the valve body 7a: As Figure 3 、 4As shown in , 6 and 7, the valve body 7a comprises a stepped cylindrical body 7a1, the diameters of the upper, middle and lower parts of the body 7a1 decrease successively, the middle part of the body 7a1 is provided with a sealing ring 7d for sealing and opening the water outlet channel 6c, and the outer periphery of the lower part is provided with a positioning part 7a2, the upper and lower surfaces of the positioning part 7a2 gradually tilt toward the middle from the body 7a1 to the outside, the lower part of the body 7a1 is provided with a base 7a3 and a connecting strip 7a4 connecting the body 7a1 and the base 7a3, the connecting strip 7a4 is evenly distributed on the circumference, and gradually tilts toward the middle from bottom to top, and the base 7a3 is annular. The present invention can make the water flow more stable and uniform when impacting upward through the dual positioning of the positioning part 7a2 and the base 7a3.

[0077] Furthermore, a guide column 7e located in the middle of a plurality of connecting strips 7a4 is provided below the body 7a1, and the guide column 7e includes a cylindrical body 7e1 and a plurality of guide strips 7e2 uniformly distributed on the outer periphery of the body 7e1, and the thickness of the guide strip 7e2 gradually increases from bottom to top, and the lower surface of the body 7a1 is concave to form an annular groove 12 arranged around the outer periphery of the guide column 7e. The guide column 7e is provided in the present invention, and through ANSYS analysis, it can be effectively reduced to form eddy currents and avoid vibration of the solenoid valve 7 caused by eddy currents; the annular groove 12 provided in the present invention allows water flow to first rush into the annular groove 12, thereby reducing the water flow velocity and avoiding vibration caused by water flow impact.

[0078] In order to prevent the electromagnetic valve 7 from being eccentric due to the absorption of impurities by the magnet 7b, thereby preventing the electromagnetic valve 7 from getting stuck, the magnet 7b is arranged on the upper part of the body 7a1 and is a ring structure coaxially arranged with the body 7a1. The material of the magnet 7b is ferrite, which is not easy to absorb impurities in water.

[0079] Preferably, the ferrite is nickel ferrite, cobalt ferrite or manganese ferrite.

[0080] In order to modify the built-in parameters and ensure the control system deviation caused by the wear and aging of the parts, a power socket electrically connected to the control board 4 is also included, and the power socket can be detachably connected to the off-line modifier. The off-line modifier is directly connected to the power socket without the need for a dedicated socket.

[0081] The pressure sensor of the present invention has the advantages of corrosion resistance, impact resistance, no hysteresis, strong medium compatibility, etc. It can be widely used in pressure detection of various media such as water, gas, and liquid. It can accurately check the internal pressure of the control barrel 2, so that the control board 4 can accurately control various functions of the water pump.

[0082] The present invention can realize functions such as waterless shutdown, constant pressure operation, pressure-maintaining operation, autonomous detection of micro-leakage and shutdown, real-time monitoring, and off-line modification, thereby realizing full automatic control.

[0083] The above embodiments are only preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. An automatic control system for a pump, characterized in that: It includes the following steps: Step 1: Build in the flow rate - head curve, flow rate - power curve, and flow rate - efficiency curve, set the pipeline pressure value p0, set the pressure holding value p set , set the pressure percentage α, and set the pressure drop value per hour Δp0; Step 2: The pressure sensor monitors the pipeline pressure in real time to obtain the current pressure value p, the magnetic induction element monitors the magnet position of the solenoid valve in real time to obtain the current pipeline flow value Q, the motor input power value W is monitored in real time, and the efficiency value η is monitored in real time; Step 3: Judge the usage state of the water pump and make adjustments: When the efficiency value η is lower than the efficiency corresponding to the current pipeline flow value Q in the flow-efficiency curve, increase the motor speed to achieve operation at the optimal working point; When the pressure sensor detects that the current pressure value p is zero and the motor input power value W is less than 1 / 2 of the power when the flow rate is zero in the flow-power curve, it is judged that there is a lack of water and the machine stops; When the pressure sensor detects that the current pressure value p is greater than the pipeline pressure value p0, reduce the motor speed, the pressure in the water inlet chamber decreases, the valve body of the solenoid valve moves downward to reduce the water outlet channel, and the pressure in the water outlet chamber decreases. Since the pressure reduction speed in the water outlet chamber is greater than the pressure reduction speed in the water inlet chamber, the water pressure moves the valve body of the solenoid valve upward to increase the water outlet channel until the valve body is in the balanced position; when the pressure sensor detects that the current pressure value p is less than the pipeline pressure value p0, increase the motor speed, the pressure in the water inlet chamber increases, the valve body of the solenoid valve moves upward to increase the water outlet channel, and the pressure in the water outlet chamber increases. Since the pressure increase speed in the water outlet chamber is greater than the pressure increase speed in the water inlet chamber, the water pressure moves the valve body of the solenoid valve downward to reduce the water outlet channel until the valve body is in the balanced position to achieve constant pressure operation; When the pressure sensor detects that the current pressure value p is greater than or equal to the pressure holding value p set , and the solenoid valve closes the water outlet channel, it is determined that the water pump is in the pressure holding state, and the motor is shut down; When the water pump is in the pressure-holding state and the pressure sensor detects that the current pressure value p is less than or equal to the product of the pressure-holding pressure value p and the pressure percentage α, start the motor and stop the motor when the current pressure value p is equal to the pressure-holding pressure value p set ; set ​ When the water pump is in the pressure-holding state, calculate the actual pressure drop value Δp per hour. When the actual pressure drop value Δp per hour is greater than the pressure drop value Δp0 per hour, it is judged that there is a micro-leakage in the water pump and the machine stops; There is also a step A between step 2 and step 3: Debug the water pump and adjust the flow-head curve, flow-power curve, and flow-efficiency curve through the current pressure value p, the current pipeline flow value Q, and the motor input power value W.

2. A pump using the fully automatic control system for pumps described in claim 1, characterized in that: It includes a housing (1), a water inlet section, a hydraulic component, a motor, and a control box. The water inlet section is arranged at the bottom of the housing (1), the control box is arranged at the upper part of the housing (1), the hydraulic component and the motor are arranged inside the housing (1) and are located between the control box and the water inlet section. The hydraulic component is driven by the motor. The control box includes a control barrel (2), a water outlet section (3) arranged at the bottom of the control barrel (2), and a control board (4) arranged inside the control barrel (2). The motor is controlled by the control board (4). A valve body installation cavity (6) communicating the water outlet section (3) and a water outlet (5) is provided inside the control barrel (2). An electromagnetic valve (7) is slidably arranged in the valve body installation cavity (6). The valve body installation cavity (6) includes a water inlet cavity (6a) communicating with the water outlet section (3), a water outlet cavity (6b) communicating with the water outlet (5), and a water outlet channel (6c) communicating the water inlet cavity (6a) and the water outlet cavity (6b). The electromagnetic valve (7) includes a valve body (7a) for blocking and opening the water outlet channel (6c), a magnet (7b) arranged on the valve body (7a), and a spring (7c) for resetting the valve body (7a) to the side of the water outlet section (3). A magnetic induction element for sensing the position of the magnet (7b) and a pressure sensor (8) for detecting the pressure in the water outlet cavity (6b) are also provided inside the control barrel (2). The magnetic induction element and the pressure sensor (8) are respectively electrically connected to the control board (4).

3. A pump according to claim 2, characterized in that: A plurality of vertical reinforcing ribs (9) and a plurality of horizontal reinforcing ribs (10) are arranged at intervals on the outer side wall of the control barrel (2). A stainless steel inlay ring (11) is sleeved at the bottom of the control barrel (2).

4. A pump according to claim 2, characterized in that: The valve body (7a) includes a stepped cylindrical body (7a1). The diameters of the upper, middle, and lower parts of the body (7a1) decrease in sequence. A sealing ring (7d) for sealing and opening the water outlet channel (6c) is sleeved in the middle part of the body (7a1). A positioning part (7a2) is provided on the outer periphery of the lower part. The upper surface and the lower surface of the positioning part (7a2) gradually incline towards the middle from the body (7a1) to the outside. A base (7a3) and connecting bars (7a4) connecting the body (7a1) and the base (7a3) are provided below the body (7a1). A plurality of the connecting bars (7a4) are circumferentially distributed and gradually incline towards the middle from bottom to top. The base (7a3) is annular.

5. A pump according to claim 4, characterized in that: A guide column (7e) is provided below the body (7a1) and is located in the middle of a plurality of connecting bars (7a4). The guide column (7e) includes a cylindrical main body (7e1) and a plurality of guide bars (7e2) circumferentially distributed on the outer periphery of the main body (7e1). The thickness of the guide bars (7e2) gradually increases from bottom to top. An annular groove (12) surrounding the outer periphery of the guide column (7e) is concavely formed on the lower surface of the body (7a1).

6. A pump according to claim 4, characterized in that: The magnet (7b) is arranged on the upper part of the body (7a1) and is an annular structure coaxial with the body (7a1). The material of the magnet (7b) is ferrite.

7. A pump according to claim 2, characterized in that: It also includes a power jack electrically connected to the control board (4). The power jack is detachably connected to an external modifier.

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