Dual protection submersible pump

Abstract

The utility model relates to submersible pump manufacturing technical field especially a double insurance protection submersible pump. Motor drive impeller rotates in the pump body, realizes liquid extraction and transportation. In order to realize double protection, submersible pump is additionally provided with pressure response control switch and float switch. Pressure response control switch is installed in the pump body outlet channel, and real -time detection outlet pressure, and below preset threshold value automatically cut off motor power supply when, float switch is fixed with pump body top, and float response end hangs in the liquid to be pumped, and with liquid level, and liquid level below preset threshold value triggers power -off. Pressure response control switch and float switch are all series in motor power supply circuit, and any trigger can be independent power -off. In this way, not only through float switch avoids motor to burn, component wear and tear because of liquid level too low idle running, through pressure response control switch deals with pipeline problem and prevents pump body vibration, motor overload, and avoids single protection failure risk, and then significantly improves submersible pump operation's safety redundancy and reliability.

Description

Technical Field

[0001] This utility model relates to the field of submersible pump manufacturing technology, and in particular to a submersible pump with double protection. Background Technology

[0002] Submersible pumps, as a type of mechanical equipment commonly used for liquid extraction, are widely used in various fields such as agricultural irrigation, industrial drainage, municipal engineering, and domestic water supply due to their advantages of not requiring additional water pipelines, convenient installation, and high pumping efficiency. Most existing submersible pump products are equipped with only a single protection mechanism or rely on manual monitoring to avoid equipment damage and safety risks under abnormal operating conditions. However, in practical applications, traditional submersible pumps have significant limitations, specifically: 1) When the liquid level drops below the pump inlet, the pump will run dry due to insufficient liquid intake. During this process, the motor continues to run but cannot dissipate heat through the liquid, causing the motor temperature to rise rapidly. This not only accelerates the aging of the insulation layer of the internal coils but can also lead to coil burnout, motor fire, and other safety accidents. Furthermore, the mechanical components inside the pump (such as the impeller and bearings) wear much faster due to lack of liquid lubrication during dry running, further increasing the probability of equipment failure and maintenance costs. 2) In actual use, blockages in the outlet pipe, failure of the outlet valve to open, or pipe ruptures are common occurrences. These problems can cause a sharp drop in pressure within the pump's outlet channel. When the outlet pressure falls below the normal operating threshold, negative pressure or turbulent water flow will form inside the pump, significantly reducing pumping efficiency and potentially causing increased pump vibration and noise. Prolonged operation under low outlet pressure conditions can lead to irregular fluctuations in motor load, easily causing motor overload and triggering the motor protection device to trip, affecting normal pumping operations. If the motor protection device fails, it can even cause more serious malfunctions such as motor damage.

[0003] Therefore, it is urgent for technical personnel to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to provide a submersible pump with dual protection, which aims to solve the problems of existing designs having a single protection mechanism, being prone to failure in dangerous working conditions, having limited adaptability to various scenarios, being inconvenient to install and maintain, and being unable to meet diverse operational safety requirements.

[0005] This utility model relates to a submersible pump with dual safety features, including a pump body, a motor, an impeller, an inlet, an outlet, and a power cable; the motor drives the impeller to rotate within the pump body to achieve liquid transport. The submersible pump with dual safety features also includes a pressure-sensing control switch and a float switch; A pressure-sensing control switch is installed in the water outlet channel of the pump body to detect the water outlet pressure and cut off the power supply to the motor when the water outlet pressure is lower than the preset pressure threshold. The float switch is connected to the top of the pump body, and its float sensing end is suspended in the liquid to be pumped. When the liquid level is lower than the preset liquid level threshold, the power supply to the motor is cut off. Both the pressure-sensing control switch and the float switch are connected in series with the power supply circuit of the motor, and either of them independently cuts off the power supply to the submersible motor when either is triggered.

[0006] As a further improvement to the technical solution disclosed in this utility model, the float switch includes a sealed float, a magnetic component, a reed switch, and a connecting wire; the magnetic component is encapsulated inside the sealed float, and the reed switch is located within the movement trajectory range of the sealed float; one end of the connecting wire is electrically connected to the reed switch, and the other end passes through the pump body and is connected in series with the power supply circuit of the motor; when the sealed float rises and falls with the liquid level of the liquid to be pumped, the magnetic component moves closer to or away from the reed switch to trigger the on / off state of the reed switch.

[0007] As a further improvement to the technical solution disclosed in this utility model, the double-protection submersible pump also includes a cable clamp; the cable clamp is fixed to the pump body in a detachable manner, and it is integrally formed with a first cable fixing channel and a second cable fixing channel; the first cable fixing channel is used to pass through and clamp the connecting wire, while the second cable fixing channel is used to pass through and clamp the power supply cable.

[0008] As a further improvement to the technical solution disclosed in this utility model, the cable clamp is detachably connected to the inner wall of the pump body by screws, and the fixed position of the cable clamp is located below the connection point between the float switch and the pump body and above the motor.

[0009] As a further improvement to the technical solution disclosed in this utility model, the cable clamp is made of insulating and highly thermally conductive material, and the inner walls of both the first cable fixing channel and the second cable fixing channel are provided with a concave-convex anti-slip structure.

[0010] As a further improvement to the technical solution disclosed in this utility model, the outer surface of the cable clamp is provided with a color marking area, with different colors marked for the first cable fixing channel and the second cable fixing channel to distinguish the insertion positions of the connecting wire and the power supply cable.

[0011] As a further improvement to the technical solution disclosed in this utility model, the sealing float is preferably made of corrosion-resistant material, and its outer wall is evenly covered with anti-slip texture.

[0012] As a further improvement to the technical solution disclosed in this utility model, the connecting wire is wrapped with a first water-resistant insulating sleeve; the power supply cable is wrapped with a second water-resistant insulating sleeve; the materials of the first water-resistant insulating sleeve and the second water-resistant insulating sleeve are both selected from chlorinated polyethylene or EPDM rubber.

[0013] As a further improvement to the technical solution disclosed in this utility model, the pressure sensing control switch includes a pressure sensor, a signal processor, and a power-off execution module; the detection end of the pressure sensor extends into the water outlet channel of the pump body, the signal processor is electrically connected to the pressure sensor to receive the water outlet pressure detection signal, and the power-off execution module is connected in series with the power supply circuit of the motor; when the signal processor determines that the water outlet pressure is lower than the preset pressure threshold, it controls the power-off execution module to cut off the power supply to the motor.

[0014] As a further improvement to the technical solution disclosed in this utility model, it also includes a sealed housing; the sealed housing is provided on the outside of the pressure sensor, signal processor and power-off execution module, and an elastic sealing gasket is provided at the connection between the sealed housing and the pump body water outlet channel.

[0015] In practical applications, the dual-protection submersible pump disclosed in this utility model can achieve at least the following beneficial technical effects, specifically: 1) By using a series design of a pressure-sensing control switch and a float switch, precise responses to two core hazardous operating conditions of the submersible pump are achieved. When the liquid level is below a preset threshold, the float switch detects the liquid level change in real time and triggers a power cut-off, preventing the motor from burning out due to lack of liquid cooling and lubrication, and avoiding excessive wear of mechanical parts. When the pressure in the outlet channel is below a preset threshold, the pressure-sensing control switch is triggered to quickly respond to problems such as pipe blockage or rupture, preventing increased pump vibration and motor overload damage. More importantly, both the pressure-sensing control switch and the float switch are forcibly linked in series with the motor power supply circuit. Triggering either switch can independently cut off the power supply, avoiding protection failure caused by the failure of a single protective component and ensuring timely response under abnormal operating conditions, significantly improving the safety redundancy and reliability of equipment operation. 2) The pressure sensing control switch is directly integrated into the pump body's outlet channel, and the float switch is connected to the top of the pump body with the float sensing end suspended in the liquid to be pumped. Real-time monitoring can be achieved without complicated installation and debugging. The independent triggering logic of the two switches can deal with individual abnormalities of liquid level and pressure, as well as handle extreme situations where both abnormalities occur simultaneously, making it suitable for diverse scenarios such as large fluctuations in liquid level in agricultural irrigation and easy blockage of pipes in industrial drainage. 3) The design does not make significant changes to the original core structure of the submersible pump (such as motor, impeller, inlet and outlet). While ensuring the upgrade of protection functions, it reduces the difficulty and cost of production and manufacturing, which is conducive to the technological iteration of existing submersible pump products. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional schematic diagram of the submersible pump with double protection disclosed in this utility model.

[0018] Figure 2 yes Figure 1 Top view.

[0019] Figure 3 yes Figure 2 AA sectional view.

[0020] Figure 4 yes Figure 2 BB cross-sectional view.

[0021] Figure 5 yes Figure 4 A magnified view of part of I.

[0022] Figure 6 This is a three-dimensional schematic diagram of the cable clamp in the double-protection submersible pump disclosed in this utility model.

[0023] 1-Pump body; 2-Motor; 3-Impeller; 4-Inlet; 5-Outlet; 6-Power cable; 61-Second water-resistant insulating sleeve; 7-Pressure sensing control switch; 8-Float switch; 81-Sealed float; 82-Connecting wire; 821-First water-resistant insulating sleeve; 9-Cable clamp; 91-First cable fixing channel; 92-Second cable fixing channel; 10-Screw. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to specific embodiments. Figures 1-5 The diagram shows the structure of the dual-protection submersible pump disclosed in this utility model. It is mainly composed of a pump body 1, a motor 2, an impeller 3, an inlet 4, an outlet 5, a power supply cable 6, a pressure-sensing control switch 7, and a float switch 8. The motor 2 is connected to the impeller 3 and drives it to rotate at high speed within the pump body 1, enabling the liquid to be drawn in through the inlet 4 and discharged through the outlet 5. Both the pressure-sensing control switch 7 and the float switch 8 are connected to the power supply circuit of the motor 2, forming a dual protection mechanism to accurately address dangerous conditions such as low liquid level and abnormal outlet pressure during pump operation.

[0025] Furthermore, during the workshop manufacturing stage, no major modifications were made to the original core structure of the submersible pump. While ensuring the upgrade of protective functions, the difficulty and cost of production and manufacturing were reduced, which is conducive to the technological iteration of existing submersible pump products. like Figure 5 As shown, the pressure-sensing control switch 7 plays a crucial role in real-time monitoring of the outlet water pressure. It is installed in the outlet channel of the pump body 1. The pressure-sensing control switch 7 mainly consists of a pressure sensor, a signal processor, and a power-off execution module (not shown in the figure). The detection end of the pressure sensor extends directly into the outlet channel of the pump body 1, ensuring accurate capture of pressure changes within the channel. The signal processor is electrically connected to the pressure sensor to receive and analyze the outlet water pressure detection signal transmitted by the pressure sensor. The power-off execution module is connected in series with the power supply circuit of the motor 2, serving as the execution component for cutting off the power supply. When the signal processor determines that the detected outlet water pressure is lower than a preset pressure threshold, it immediately sends a command to the power-off execution module to control it to cut off the power supply to the motor 2. This allows for rapid response to problems such as pipe blockage and rupture, preventing increased vibration of the pump body 1 and overload damage to the motor 2, thereby improving reliability under complex operating conditions. It is worth noting that the pressure sensing control switch 7 is also equipped with a sealed housing (not shown in the figure). The sealed housing covers the outside of the pressure sensor, signal processor, and power-off execution module, and an elastic sealing gasket is provided at the connection between the sealed housing and the water outlet channel of the pump body 1. Through the cooperation of the sealed housing and the elastic sealing gasket, the liquid in the water outlet channel can be effectively isolated, preventing the internal components of the pressure sensing control switch 7 from short-circuiting or failing due to water ingress, ensuring its long-term stable operation in a humid water environment, and further guaranteeing the continuity of the pressure monitoring function. like Figures 1-5 As shown, the float switch 8 is connected to the top of the pump body 1 and consists of several parts, including a sealed float 81, a magnetic component, a reed switch, and a connecting wire 82. The magnetic component is encapsulated inside the sealed float 81, while the reed switch is fixed to the pump body 1 and located within the movement trajectory of the sealed float 81. One end of the connecting wire 82 is electrically connected to the reed switch, and the other end passes through the pump body 1 and is connected in series with the power supply circuit of the motor 2. When the liquid level changes, the sealed float 81 rises and falls synchronously with the liquid level, causing the internal magnetic component to move closer to or away from the reed switch. When the liquid level is lower than a preset liquid level threshold, the relative position of the magnetic component and the reed switch triggers the reed switch to open, thereby cutting off the power supply to the motor 2. This prevents the motor 2 from burning out due to lack of liquid cooling and lubrication, and avoids excessive wear of mechanical parts. It is particularly suitable for scenarios with large liquid level fluctuations in agricultural irrigation, meeting diverse usage needs. Furthermore, the sealing float 81 is preferably made of corrosion-resistant materials (such as polypropylene, polytetrafluoroethylene, etc.), which can adapt to corrosive liquids that may be present in scenarios such as agricultural irrigation and industrial drainage, thereby extending the service life of the float switch 8; and the outer wall of the sealing float 81 is evenly distributed with anti-slip textures, which can reduce the interference of liquid flow on the rise and fall of the float and ensure the accuracy of liquid level detection. In addition, as Figure 5 As shown, the connecting wire 82 of the float switch 8 is wrapped with a first water-resistant insulating sleeve 821, and the power supply cable 6 is wrapped with a second water-resistant insulating sleeve 61. The first water-resistant insulating sleeve 821 and the second water-resistant insulating sleeve 61 are both made of chlorinated polyethylene or EPDM rubber, which gives them excellent water resistance, insulation and anti-aging properties. This effectively prevents the cables from suffering insulation damage and leakage due to long-term immersion, providing a safety guarantee for the long-term underwater operation of the submersible pump. like Figures 4-6 As shown, the submersible pump with double safety protection is equipped with a cable clamp 9. The cable clamp 9 is detachably connected to the inner wall of the pump body 1 via screws 10. Its fixed position is below the connection point between the float switch 8 and the pump body 1, and above the motor 2. This not only prevents the cable clamp 9 from interfering with the lifting and lowering movement of the float switch 8, but also shortens the cable connection distance by being close to the power supply end of the motor 2. Figure 6 As shown, the cable clamp 9 is integrally formed with a first cable fixing channel 91 and a second cable fixing channel 92. The first cable fixing channel 91 is used to pass through and clamp the connecting wire 82, and the second cable fixing channel 92 is used to pass through and clamp the power supply cable 6.

[0026] To improve the stability of the fixation, as a further optimization of the above technical solution, the inner walls of the first cable fixing channel 91 and the second cable fixing channel 92 are provided with concave-convex anti-slip structures (not shown in the figure) to effectively increase the friction between the inner wall of the channel and the first water-resistant insulating sleeve 821 and the second water-resistant insulating sleeve 61, and prevent the cable from shifting or falling off due to vibration during the operation of the submersible pump.

[0027] Furthermore, the cable clamp 9 is preferably made of an insulating and highly thermally conductive material (such as modified nylon, ceramic composite materials, etc.). Its insulating properties prevent leakage risks caused by contact between cables, while its high thermal conductivity helps dissipate the heat generated during cable operation, preventing excessively high local temperatures from accelerating insulation aging. In addition, the outer surface of the cable clamp 9 has color-coded markings, with different colors corresponding to the first cable fixing channel 91 and the second cable fixing channel 92 (e.g., red for the first cable fixing channel 91 and blue for the second cable fixing channel 92). This color differentiation clearly indicates the placement of the connecting wire 82 and the power supply cable 6, preventing incorrect cable installation, improving assembly efficiency and accuracy, and indirectly reducing equipment installation and maintenance costs. It is important to note that both the pressure-sensing control switch 7 and the float switch 8 are connected in series with the power supply circuit of the motor 2, and either of them can independently cut off the power supply to the motor 2 when triggered. By adopting the above technical solution, the submersible pump forms a dual-protection mechanism. When only the liquid level is below the preset liquid level threshold, the float switch 8 is triggered to cut off the power; when only the outlet water pressure is below the preset pressure threshold, the pressure-sensing control switch 7 is triggered to cut off the power; and when both abnormal conditions occur simultaneously, either switch can be triggered to achieve power-off protection. In this way, it avoids protection failure due to the failure of a single protection mechanism, and ensures timely response under abnormal conditions, greatly improving the safety redundancy and reliability of the submersible pump operation. The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A submersible pump with double-protection features, comprising a pump body, a motor, an impeller, an inlet, an outlet, and a power supply cable; wherein the motor drives the impeller to rotate within the pump body to achieve liquid transport, characterized in that: It also includes pressure-sensitive control switches and float switches; The pressure sensing control switch is installed in the water outlet channel of the pump body to detect the water outlet pressure and cut off the power supply to the motor when the water outlet pressure is lower than the preset pressure threshold. The float switch is connected to the top of the pump body, and its float sensing end is suspended in the liquid to be pumped. When the liquid level is lower than the preset liquid level threshold, the power supply to the motor is cut off. Both the pressure-sensing control switch and the float switch are connected in series with the power supply circuit of the motor, and either of them independently cuts off the power supply to the submersible motor when either is triggered.

2. The submersible pump with double-protection features according to claim 1, characterized in that, The float switch includes a sealed float, a magnetic component, a reed switch, and a connecting wire; the magnetic component is encapsulated inside the sealed float, and the reed switch is located within the movement trajectory range of the sealed float; one end of the connecting wire is electrically connected to the reed switch, and the other end passes through the pump body and is connected in series with the power supply circuit of the motor; when the sealed float rises and falls with the liquid level of the liquid to be pumped, the magnetic component moves closer to or further away from the reed switch to trigger the on / off state of the reed switch.

3. The submersible pump with double-protection as described in claim 2, characterized in that, It also includes a cable clamp; the cable clamp is detachably fixed to the pump body, and it is integrally formed with a first cable fixing channel and a second cable fixing channel; the first cable fixing channel is used to pass through and clamp the connecting wire, while the second cable fixing channel is used to pass through and clamp the power supply cable.

4. The submersible pump with double-protection as described in claim 3, characterized in that, The cable clamp is detachably connected to the inner wall of the pump body by screws, and the fixed position of the cable clamp is located below the connection point between the float switch and the pump body and above the motor.

5. The submersible pump with double-protection as described in claim 3, characterized in that, The cable clamp is made of insulating and highly thermally conductive material, and the inner walls of both the first cable fixing channel and the second cable fixing channel are provided with a concave-convex anti-slip structure.

6. The submersible pump with double-protection features according to claim 3, characterized in that, The outer surface of the cable clamp is provided with a color marking area, with different colors marked for the first cable fixing channel and the second cable fixing channel to distinguish the insertion positions of the connecting wire and the power supply cable.

7. The submersible pump with dual protection according to any one of claims 2-5, characterized in that, The sealing float is made of corrosion-resistant material and its outer wall is covered with anti-slip texture.

8. The submersible pump with dual protection according to any one of claims 2-5, characterized in that, The connecting wire is wrapped with a first water-resistant insulating sleeve; the power supply cable is wrapped with a second water-resistant insulating sleeve; the materials of the first water-resistant insulating sleeve and the second water-resistant insulating sleeve are both selected from chlorinated polyethylene or EPDM rubber.

9. The submersible pump with double-protection features according to any one of claims 1-5, characterized in that, The pressure sensing control switch includes a pressure sensor, a signal processor, and a power-off execution module; the detection end of the pressure sensor extends into the water outlet channel of the pump body, the signal processor is electrically connected to the pressure sensor to receive the water outlet pressure detection signal, and the power-off execution module is connected in series with the power supply circuit of the motor; when the signal processor determines that the water outlet pressure is lower than a preset pressure threshold, it controls the power-off execution module to cut off the power supply to the motor.

10. The submersible pump with double-protection as described in claim 9, characterized in that, It also includes a sealed housing; the sealed housing covers the outside of the pressure sensor, the signal processor and the power-off execution module, and an elastic sealing gasket is provided at the connection between the sealed housing and the pump body water outlet channel.

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