Submersible pump start-stop circuit with water level identification function

Abstract

The utility model belongs to the technical field of submersible pump equipment, and relates to a submersible pump start-stop circuit with a water level identification function, which comprises an L line and an N line, the L line is connected with a linked switch SB1, the linked switch SB1 comprises a normally-closed button and a normally-open switch, the front end of the normally-closed button of the linked switch SB1 is connected with the L line, and the front end of the normally-open switch of the linked switch SB1 is connected with the N line. The rear end of the relay KM is connected in series with a stop button SB2, a start button SB3, a coil of the contactor KM and a thermal relay FR and then is connected to the N line, the L line is connected with a normally-open inductive switch SQ1, and the normally-open inductive switch SQ1 is connected in parallel with a second normally-open switch of the relay KA, then is connected in series with a normally-closed inductive switch SQ2 and a coil of the relay KA and then is connected to the N line. The submersible pump has the functions of manual start and stop and automatic water level identification and automatic start and stop, improves the working efficiency, safety and intelligent level of the submersible pump, reduces labor cost and resource waste, and has wide application prospects.

Description

Technical Field

[0001] This utility model belongs to the technical field of submersible pump equipment, specifically relating to a submersible pump start-stop circuit for water level identification. Background Technology

[0002] Currently, in scenarios requiring submersible pumps for drainage or pumping operations, such as mine drainage, farmland irrigation pond pumping, and urban groundwater drainage, traditional submersible pumps mostly require manual operation to start and stop. On the one hand, manual operation makes it difficult to accurately grasp water levels, easily leading to pumps running dry or failing to start in time when the water level is too high. For example, in mine drainage, failure to start the submersible pump in time according to the water level can lead to mine flooding accidents, endangering the safety of underground workers and the normal operation of equipment. In farmland irrigation, untimely manual operation may result in water waste or insufficient irrigation. On the other hand, continuous manual monitoring consumes a lot of manpower and cannot achieve real-time, accurate adaptive control of water levels.

[0003] In addition, existing technologies rely on manual control or float switch control. Manual control consumes a lot of manpower and cannot achieve real-time and accurate water level adaptive control. In practical applications, float switches are prone to problems such as float jamming and entanglement leading to control failure, and the float being unstable at the start-stop threshold, causing the submersible pump to frequently start and stop and burn out the submersible pump.

[0004] Therefore, a submersible pump start-stop circuit based on water level identification is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a submersible pump start-stop circuit with water level recognition, which has water level recognition and submersible pump start-stop functions, and solves the problem that the existing technology of controlling submersible pumps by personnel or float switches is not convenient and practical.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a submersible pump start-stop circuit for water level identification, including an L line and an N line. A linkage switch SB1 is connected to the L line. The linkage switch SB1 includes a normally closed button and a normally open switch. The front end of the normally closed button of the linkage switch SB1 is connected to the L line, and the rear end is connected in series with a stop button SB2, a start button SB3, the coil of contactor KM, and a thermal relay FR, and then connected to the N line. The start button SB3 is connected in parallel with the normally open switch of contactor KM. The front end of the normally open switch of the linkage switch SB1 is connected to the L line, and the rear end is connected in series with the first normally open switch of relay KA and then connected to the N line. A normally open inductive switch SQ1 is connected to the L line. The normally open inductive switch SQ1 is connected in parallel with the second normally open switch of relay KA, and then in series with a normally closed inductive switch SQ2 and the coil of relay KA, and then connected to the N line.

[0007] Preferably, the normally open inductive switch SQ1 and normally closed inductive switch SQ2 have built-in water level sensors, which are installed at the top and bottom of the submersible pump, respectively.

[0008] Preferably, the linkage switch SB1 is covered with TPU material and has a beryllium bronze stamped part inside.

[0009] Preferably, the L-line and N-line are RVVP shielded cables, and the insulation layer of the L-line and N-line is a double-layer co-extruded structure, with the inner layer being flame-retardant PVC and the outer layer being TPE material.

[0010] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0011] 1. This utility model has the functions of manual start-stop and automatic water level recognition and automatic start-stop, which improves the efficiency, safety and intelligence of submersible pumps, reduces labor costs and resource waste, and has broad application prospects;

[0012] 2. This utility model has water level recognition and submersible pump start / stop functions, which solves the problem that the existing technology of controlling submersible pumps by personnel or float switches is not convenient and practical. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a circuit diagram of a submersible pump start / stop circuit for water level recognition. Detailed Implementation

[0015] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0016] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0017] Example 1, as Figure 1As shown, a submersible pump start / stop circuit for water level identification includes an L line and an N line. A linkage switch SB1 is connected to the L line. The linkage switch SB1 includes a normally closed button and a normally open switch. The normally closed button part constitutes a manual control circuit for manual start / stop; the normally open switch part constitutes an automatic control circuit, which is linked with a relay KA to achieve automatic start / stop. After pressing the normally closed button of the linkage switch SB1, the normally open switch closes, switching to the automatic control circuit.

[0018] Manual control circuit: The normally closed button of the interlock switch SB1 is connected to the L line at the front end, and the stop button SB2, start button SB3, the coil of contactor KM, and thermal relay FR are connected in series at the rear end to the N line. In manual operation mode, pressing the stop switch SB2 manually cuts off the circuit, forcibly disconnecting the circuit, enabling rapid power cut-off in emergencies and ensuring safety. The thermal relay FR monitors the circuit current and disconnects the control circuit in case of overload, preventing the submersible pump from burning out due to stalling, abnormal voltage, etc.

[0019] The start button SB3 is connected in parallel with a normally open switch of contactor KM. The start switch SB3 is also connected in parallel with the self-locking contact of contactor KM to achieve self-holding after one-button start. Contactor KM is controlled by the on / off state of its coil, and the self-locking design prevents continuous pressing of the start button SB3.

[0020] Automatic control circuit: The normally open switch of the linkage switch SB1 is connected to the L line at the front end, and the first normally open switch of the relay KA is connected in series at the rear end to the N line. A normally open inductive switch SQ1 is connected to the L line. When the water level reaches a high threshold, the normally open inductive switch SQ1 is closed, triggering automatic start-up to detect high water levels, such as mine warning water levels.

[0021] To avoid human error, the normally open inductive switch SQ1 is connected in parallel with the second normally open switch of relay KA, and then connected in series with the normally closed inductive switch SQ2 and the coil of relay KA, which are then connected to the neutral (N) line. When the water level drops to the low threshold, the normally closed inductive switch SQ2 opens, triggering an automatic stop to prevent excessive pumping and dry running, thus protecting the pump body. Relay KA achieves self-locking of the automatic control circuit through the first normally open switch and the first normally open switch.

[0022] The specific design of the aforementioned key components will be discussed in detail below:

[0023] The normally open inductive switch SQ1 and normally closed inductive switch SQ2 have built-in water level sensors, which are installed at the top and bottom of the submersible pump, respectively. The water level sensors are either capacitive or photoelectric, capable of accurately detecting changes in water level. Capacitive sensors trigger the switch by detecting changes in capacitance caused by changes in water level; photoelectric sensors detect water level by reflecting light signals.

[0024] The normally open inductive switch SQ1 is installed on the top of the submersible pump to detect the high water level, i.e., the starting water level. The normally closed inductive switch SQ2 is installed on the bottom of the submersible pump to detect the low water level, i.e., the stopping water level. This avoids the mechanical jamming problem of the float switch. It has no mechanical moving parts, has a long service life, and high reliability.

[0025] The linkage switch SB1 is covered with TPU material, and the interior is a beryllium bronze stamped part. TPU (thermoplastic polyurethane) has excellent wear resistance, while beryllium bronze has high conductivity, high elastic modulus and good fatigue resistance. The stamping process ensures high contact accuracy and reliable contact.

[0026] The L and N lines utilize RVVP shielded cables. The insulation of the L and N lines features a double-layer co-extruded structure, with an inner layer of flame-retardant PVC and an outer layer of TPE material. The L and N lines employ oxygen-free copper conductors, exhibiting excellent conductivity and low resistance, thus reducing power loss. The RVVP cable incorporates an aluminum foil shielding layer and a tinned copper wire braided layer, effectively shielding against electromagnetic interference and ensuring stable signal transmission. The inner flame-retardant PVC material provides excellent flame-retardant properties, preventing fire hazards, while the outer TPE material (thermoplastic elastomer) offers high flexibility, good weather resistance, and anti-aging properties.

[0027] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A submersible pump start / stop circuit for water level identification, characterized in that, The circuit includes an L line and an N line. A linkage switch SB1 is connected to the L line. The linkage switch SB1 includes a normally closed button and a normally open switch. The front end of the normally closed button of the linkage switch SB1 is connected to the L line, and the rear end is connected in series with a stop button SB2, a start button SB3, the coil of contactor KM, and a thermal relay FR, and then connected to the N line. The start button SB3 is connected in parallel with the normally open switch of contactor KM. The front end of the normally open switch of the linkage switch SB1 is connected to the L line, and the rear end is connected in series with the first normally open switch of relay KA, and then connected to the N line. A normally open inductive switch SQ1 is connected to the L line. The normally open inductive switch SQ1 is connected in parallel with the second normally open switch of relay KA, and then in series with a normally closed inductive switch SQ2 and the coil of relay KA, and then connected to the N line.

2. The submersible pump start / stop circuit for water level identification according to claim 1, characterized in that, The normally open inductive switch SQ1 and normally closed inductive switch SQ2 have built-in water level sensors, which are installed on the top and bottom of the submersible pump, respectively.

3. The submersible pump start / stop circuit for water level identification according to claim 1, characterized in that, The linkage switch SB1 is covered with TPU material, and the inside is a beryllium bronze stamped part.

4. The submersible pump start / stop circuit for water level identification according to claim 1, characterized in that, The L and N lines are RVVP shielded cables. The insulation layers of the L and N lines are double-layer co-extruded structures, with the inner layer being flame-retardant PVC and the outer layer being TPE material.

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