Pool liquid level control device

Abstract

The utility model relates to a pool liquid level control device which comprises a pool, a detection unit, a control box and a water pump, a sliding groove is formed in the top face of the pool, a plurality of connecting supports are movably installed on the sliding groove, one end of each connecting support extends towards the center of the pool, an insertion groove is formed in the top face of each connecting support, and an installation plate is vertically inserted into each insertion groove. The detection unit is correspondingly arranged at the bottom end of the mounting plate; the water pump is arranged on one side of the top surface of the pool; the control box is arranged on one side of the water pool and electrically connected with the detection unit and the water pump through wires. Through mutual cooperation of the control box, the ultrasonic liquid level meter and the variable frequency motor, closed-loop control over the liquid level of the pool is achieved, the variable frequency motor can achieve automatic constancy of the liquid level through dynamic adjustment of the frequency, it can be effectively ensured that the liquid level is always kept at the reasonable settable liquid level, damage to a water pump caused by vacuumizing is avoided, and the service life of the water pump is prolonged. The service life is prolonged, and meanwhile power consumption can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level automatic control, in particular to a water pool liquid level control device. Background Art

[0002] Minben Mining's machine-made sand and gravel production process adopts a wet screening and washing process. The wastewater from the production process is first concentrated in a wastewater collection pool, and then sent to the solid-liquid center through a sewage pump for purification and recycling.

[0003] Since the original system uses soft start drive, the water pump motor cannot adjust the speed and runs at a fixed power frequency. In actual use, in order to reserve margin for the future, the power configuration of the water pump and motor is generally a little larger, which causes the sewage pool water pump to be in empty operation for a long time, which in turn causes the water pump to be vacuumed and damage the pump body (cavitation); short-term shutdown of high liquid level will cause sewage overflow and cause safety accidents. At the same time, the general liquid level control structure is often equipped with only one detection point, and the detection position is fixed. During replacement or maintenance, it is necessary to stop the machine for processing, and it is easy to affect the operation of the entire liquid level control system when obstacles appear below the detection point. Utility Model Content

[0004] Based on the above description, the utility model provides a pool liquid level control device to solve the shortcomings of existing liquid level control equipment that easily causes the water pump to draw a vacuum and damage the pump body, and short-term stoppages may cause sewage overflow.

[0005] The utility model is realized through the following technical solutions:

[0006] A water pool liquid level control device comprises a water pool, a detection unit, a control box and a water pump.

[0007] A slide groove is provided on the top surface of the water pool, and a plurality of connecting brackets are movably installed on the slide groove. One end of the connecting bracket extends toward the center of the water pool and is penetrated by a slot on the top surface. A mounting plate is vertically inserted into the slot.

[0008] The detection units are arranged in plurality and are respectively mounted on the bottom of the mounting plate and arranged downward;

[0009] The water pump is arranged on one side of the top surface of the pool, and the water pumping end of the water pump is connected to a water pipe and extends to the inside of the pool;

[0010] The control box is arranged on one side of the pool and is electrically connected to the detection unit and the water pump through a wire.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows.

[0012] Further, an installation groove is vertically provided on the inner side wall of the slot. A gear is provided in the installation groove. The center of the side wall of the installation plate is recessed inward, and a plurality of tooth blocks are vertically provided on the surface of the recess. The gear meshes with the tooth blocks.

[0013] Further, a part of the inside of the connection bracket is hollow. A transmission shaft is provided at the center of the gear, and its two ends extend toward both sides respectively to be rotatably connected to the side wall of the connection bracket. A servo motor is further provided on the outer side wall of the connection bracket. The output end of the servo motor is in transmission connection with the transmission shaft, and a control button for controlling the opening and closing of the servo motor is further provided on the side wall of the connection bracket.

[0014] Further, the detection unit includes a plurality of ultrasonic liquid level gauges. The output signal of each ultrasonic liquid level gauge is set to 4-20MA. Among them, the 4MA signal of the ultrasonic liquid level gauge is the distance from the probe to the lowest water level, and the 20MA signal of the ultrasonic liquid level gauge is the distance from the probe to the highest water level. And the maximum range of the ultrasonic liquid level gauge is 5-5.5 meters. Each ultrasonic liquid level gauge passes through a wire to the top surface of the installation plate and is electrically connected to the control box.

[0015] Further, the water pump is a centrifugal pump, and a variable frequency motor is further equipped on the water pump. The variable frequency motor is electrically connected to the control box through a wire.

[0016] Further, a display screen for displaying the measurement data of the detection unit is further provided on the surface of the control box, and an operation panel is arranged below the display screen.

[0017] Compared with the prior art, the technical solution of the present application has the following beneficial technical effects:

[0018] 1. The present application is improved based on the existing liquid level control equipment. By utilizing the mutual cooperation among the control box, the ultrasonic liquid level gauges, and the variable frequency motor, the closed-loop control of the water tank liquid level is realized. The variable frequency motor can realize the automatic constancy of the liquid level through the dynamic adjustment of the frequency, which can effectively ensure that the liquid level always remains at a reasonable and settable liquid level, avoid damage to the water pump caused by pumping vacuum, extend the service life, and reduce power consumption at the same time;

[0019] 2. The detection unit adopts a plurality of ultrasonic liquid level gauges and cooperates with the connection bracket on the water tank, greatly improving the accuracy of the data detected by the detection unit, ensuring that the liquid surface will not be lower than the preset lowest point. At the same time, during later maintenance and repair, only the ultrasonic liquid level gauge to be repaired needs to be correspondingly turned off, and there is no need to stop the equipment, and its height adjustment is also very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1Structural schematic diagram of the water tank and control box in this embodiment;

[0021] Figure 2 Structural schematic diagram of the connecting bracket in this embodiment;

[0022] Figure 3 Structural schematic diagram of the mounting plate in this embodiment;

[0023] Figure 4 Structural schematic diagram of the liquid level control principle in this embodiment;

[0024] Wherein: 1. Water tank; 11. Slide groove; 12. Connecting bracket; 13. Slot; 14. Mounting plate; 15. Gear; 16. Servo motor; 2. Detection unit; 21. Ultrasonic liquid level gauge; 3. Water pump; 31. Variable frequency motor; 4. Control box; 41. Display screen. Detailed implementation mode

[0025] To facilitate the understanding of this application, the following will describe this application more comprehensively with reference to the relevant attached drawings. Embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this application more thorough and comprehensive.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the description of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0027] Combined with Figures 1-4 As shown, a water tank liquid level control device includes:

[0028] A water tank 1, with a slide groove 11 circumferentially arranged on the top surface of the water tank 1. A plurality of connecting brackets 12 (only one is drawn in the attached drawing) are movably installed in the slide groove 11, and a part of the connecting bracket 12 extends towards the center of the water tank 1, and a slot 13 is opened on the extended part. A mounting plate 14 is vertically arranged inside the slot 13 and can be adjusted up and down;

[0029] A detection unit 2, composed of a plurality of ultrasonic liquid level gauges 21, each of which is correspondingly installed at the bottom end of the mounting plate 14 for real-time monitoring of the water level;

[0030] A water pump 3 for pumping the sewage inside the water tank 1;

[0031] The control box 4 is the control center of the entire equipment. It is equipped with a PLC microcontroller and a PID instruction block installed on the PLC microcontroller. It is mainly used to receive the real-time water level information detected by the detection unit 2, and then realize the closed-loop control of the liquid level of the water tank 1 by controlling the water pump 3.

[0032] Specifically, the slide groove 11 on the top surface of the pool 1 is surrounded by a rectangle, and four connecting brackets 12 are provided and arranged in a circular array on the four sides. At the same time, a mounting groove is provided on the inner wall of the slot 13 on the connecting bracket 12, and a gear 15 is provided inside the mounting groove. The gear 15 partially protrudes out of the mounting groove and contacts the side wall of the mounting plate 14.

[0033] At the same time, the center of the side wall of the mounting plate 14 is concave inward and extends to the upper and lower ends into a long strip shape. A plurality of tooth blocks are provided on the surface of the concave part. The tooth blocks mesh with the side wall of the gear 15 to form a fixing effect. When the gear 15 rotates, the mounting plate 14 can be driven to move up and down.

[0034] Based on the above lifting and lowering adjustment effects, in this embodiment, part of the position inside the connecting bracket 12 should be set to be hollow, and the mounting groove should be connected to the central control part. At the same time, a transmission shaft is provided at the center of the gear 15, and the two ends of the transmission shaft extend to both sides respectively and are rotatably connected to the inner wall of the connecting bracket 12. A servo motor 16 is also provided on the outer wall of the connecting bracket 12, and the output shaft of the servo motor 16 is transmission-connected to one end of the transmission shaft.

[0035] In order to further facilitate the measurement of the lifting height, that is, to enable the detection unit 2 to be adjusted to the optimal height through the mounting plate 14, a rotation sensor should be arranged inside the connecting bracket 12 to measure the number of rotations of its transmission shaft, thereby correspondingly measuring the lifting height of its mounting plate 14; alternatively, an identification mark should be directly set on the side wall of the mounting plate 14 so that the staff can quickly read the height information, and at the same time, a control button for controlling the servo motor 16 is also correspondingly arranged on the outer wall of the connecting bracket 12.

[0036] The ultrasonic level meter 21 adopts the 7ML5201 ultrasonic level meter 21 of SITRANS LU150 series produced by Siemens, with an output signal of 4-20MA, DC24 two-wire output, and an integrated instrument. The maximum measuring range can reach 5-5.5 meters;

[0037] 20MA corresponding value: the distance from the ultrasonic level meter 21 probe to the highest water level;

[0038] 4MA corresponding value: the distance from the ultrasonic level meter 21 probe to the lowest water level.

[0039] The centrifugal pump in the sewage tank 1 is equipped with a variable-frequency motor. For this model, the Inovance MD290 series frequency converter can be used as the driving core of the variable-frequency motor 31 of the water pump 3. The overflow water level of the sewage tank 1 is 2 meters, and the upper limit liquid level of the suction pipe of the water pump 3 is 0.8 meters.

[0040] The control box 4 uses the Siemens S1500 series PLC as the core hardware of the controller and is electrically connected to the ultrasonic level gauge 21 and the variable-frequency motor 31 through wires respectively. Moreover, in this embodiment, a display screen 41 is also equipped on the surface of the control box 4 to synchronously display the structures detected by all the ultrasonic level gauges 21, which can not only ensure the stability of the detection data but also avoid equipment shutdown during subsequent maintenance due to repair or replacement of parts, greatly improving the working efficiency of the equipment.

[0041] In this embodiment, by using the variable-frequency motor 31 and the water pump 3 as the actuators, it replaces the traditional control mode of the water pump 3 flow control depending on the size of the pipeline valve. The whole control system has a high integration degree and features high reliability, high control precision, and stable operation.

[0042] Moreover, the controller internally adopts a manual-automatic dual-mode design and can switch between the manual and automatic control modes according to the usage situation. When a fault occurs in the measurement of the ultrasonic level gauge 21, it can be switched to the manual mode on the software interface of the upper computer operation computer, and the operation frequency of the water pump 3 is manually input for temporary control to handle the fault without stopping the machine, ensuring production safety.

[0043] After setting a suitable target liquid level set value through the upper computer software, the frequency converter runs in a constant liquid level control mode. When the liquid level is set to 1.1M, the actually detected liquid level in the swirl well is basically constant between 1.0 and 1.2M. When the liquid level is lower than 1.0M, the frequency of the frequency converter automatically decreases until it finally stops at the lowest operating frequency (20HZ). This is because if the operating frequency of the frequency converter is too low, the lift of the water pump 3 is insufficient, and the motor power is wasted, which is not conducive to energy-saving operation. Setting the lowest operating frequency can enable the lift of the water pump 3 to meet the requirements (the sewage in the sewage collection tank will not cause the liquid level to be too high and cause sewage overflow accidents at the lowest operating power). The frequency of the frequency converter generally reaches about 38HZ during production, and the energy-saving rate per unit time or per unit output can reach about 33% in this way. Moreover, the constant liquid level control method can greatly reduce the labor intensity of the operators and set a model project for the energy-saving and consumption-reduction transformation of other water pumps 3 in Minben Mining.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of the present invention.

Claims

1. A water pool liquid level control device, comprising a water pool (1), a detection unit (2), a control box (4) and a water pump (3), Features: A slide groove (11) is provided on the top surface of the water pool (1), and a plurality of connecting brackets (12) are movably mounted on the slide groove (11). One end of the connecting bracket (12) extends toward the center of the water pool (1) and a slot (13) is provided through the top surface. A mounting plate (14) is vertically inserted into the slot (13); The detection units (2) are arranged in a plurality and are respectively mounted on the bottom of the mounting plate (14) and arranged downward; The water pump (3) is arranged on one side of the top surface of the water pool (1), and a water delivery pipe is connected to the water pump end of the water pump (3) and extends into the interior of the water pool (1); The control box (4) is arranged on one side of the water pool (1) and is electrically connected to the detection unit (2) and the water pump (3) via wires.

2. The water tank liquid level control device according to claim 1, wherein An installation groove is vertically arranged on the inner side wall of the slot (13), a gear (15) is arranged in the installation groove, the center of the side wall of the installation plate (14) is recessed inwards, and a plurality of gear blocks are vertically arranged on the surface of the recess, and the gear (15) meshes with the gear blocks.

3. The water tank liquid level control device according to claim 2, wherein The interior of the connecting bracket (12) is hollow, a transmission shaft is provided at the center of the gear (15), and two ends of the gear (15) extend toward both sides to be rotatably connected to the side wall of the connecting bracket (12), a servo motor (16) is also provided on the outer wall of the connecting bracket (12), an output end of the servo motor (16) is transmission-connected to the transmission shaft, and a control button for controlling the opening and closing of the servo motor (16) is also provided on the side wall of the connecting bracket (12).

4. A pool liquid level control device according to claim 1, characterized in that The detection unit comprises a plurality of ultrasonic level meters (21), the output signal of each ultrasonic level meter (21) being set to 4-20MA, wherein the 4MA signal of the ultrasonic level meter (21) is the distance from the probe to the lowest water level, the 20MA signal of the ultrasonic level meter (21) is the distance from the probe to the highest water level, and the maximum measuring range of the ultrasonic level meter (21) is 5-5.5 meters. Each ultrasonic level meter (21) is passed through a wire to the top surface of the mounting plate (14) and is electrically connected to the control box (4).

5. A pool liquid level control device according to claim 1, wherein, The water pump (3) is a centrifugal pump, and the water pump (3) is also equipped with a variable frequency motor (31), and the variable frequency motor (31) is electrically connected to the control box (4) via a wire.

6. The water tank liquid level control device according to claim 1, characterized in that The surface of the control box (4) is also provided with a display screen (41) for displaying measurement data of the detection unit (2), and an operation panel is provided below the display screen (41).

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