Anti-corrosion structure between cable and pump cylinder in submersible electric pump

Abstract

The utility model relates to submersible electric pump technical field more specifically is a kind of anticorrosion structure between cable and pump cylinder in submersible electric pump. A kind of anticorrosion structure between cable and pump cylinder in submersible electric pump, including pump cylinder, pressure chamber, sealant one, insulating layer, sealant two, cable, protective sleeve and pressing plate, pump cylinder one end is connected with pressure chamber, insulating layer is arranged between pump cylinder and cable, insulating layer one side is provided with sealant one, other side is provided with sealant two, cable outside is provided with protective sleeve, and pressing plate is provided on protective sleeve. The path of occurrence of crevice corrosion and galvanic corrosion can be blocked simultaneously, the corrosion resistance of cable and pump cylinder connecting part is significantly improved, the service life of submersible electric pump in corrosive medium is prolonged, and user maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of submersible pump technology, and more specifically to an anti-corrosion structure between the cable and the pump barrel in a submersible pump. Background Technology

[0002] Submersible pumps for wells, as the core equipment for deep well water extraction, are widely used in domestic water supply, farmland irrigation, industrial cooling, and mariculture. During operation, they must be completely submerged in water, maintaining long-term direct contact with the pumped medium. The physical and chemical properties of the medium vary greatly depending on the region: some operating conditions involve media rich in silt, while others contain high concentrations of minerals or alkaline ions. Especially in mariculture scenarios, the medium, due to the presence of seawater, is rich in chloride ions, which are not only highly corrosive but also constitute a natural electrolyte.

[0003] In existing submersible pump structures, the connection between the cable and the pump casing is a high-risk area for corrosion failure. On the one hand, when the cable comes into contact with the metal surface of the pump casing, a narrow gap of 0.025-0.1 mm is easily formed, which meets the typical conditions for crevice corrosion. The retention of the medium in the gap leads to a decrease in oxygen concentration and pH value, while chloride ions accumulate in the gap, forming a concentration cell and causing localized accelerated dissolution of the pump casing. On the other hand, the cable has a weak leakage current, and in a corrosive electrolyte environment, galvanic corrosion is easily formed between the pump casing and the cable, further aggravating pump casing damage.

[0004] The combined effect of the two corrosion effects often leads to the pump casing being corroded and perforated at the contact point with the cable, causing equipment failure and significantly shortening the service life of the submersible pump. This not only affects the user's normal water demand but also increases the economic cost of equipment maintenance and replacement, becoming a key issue restricting the reliable application of submersible pumps in complex corrosive conditions. Utility Model Content

[0005] To overcome the shortcomings of the prior art, this utility model provides an anti-corrosion structure between the cable and the pump barrel in a submersible electric pump. Its beneficial effects are that this utility model can simultaneously block the occurrence paths of crevice corrosion and galvanic corrosion, significantly improve the corrosion resistance of the connection between the cable and the pump barrel, extend the service life of the submersible electric pump in corrosive media, and reduce user maintenance costs.

[0006] A corrosion-resistant structure between the cable and the pump barrel in a submersible electric pump includes a pump barrel, a discharge chamber, a first sealant, an insulation layer, a second sealant, a cable, a protective sleeve, and a pressure plate. The discharge chamber is connected to one end of the pump barrel. An insulation layer is provided between the pump barrel and the cable. The first sealant is provided on one side of the insulation layer, and the second sealant is provided on the other side. A protective sleeve is provided on the outside of the cable, and a pressure plate is provided on the protective sleeve.

[0007] The sealant is located between the pump barrel and the insulation layer to achieve a sealed fit between the pump barrel and the insulation layer.

[0008] The second sealant is located between the insulation layer and the cable, and is used to achieve a sealed fit between the insulation layer and the cable.

[0009] The insulation layer completely covers the contact area between the pump barrel and the cable, and is used to isolate the pump barrel and the cable.

[0010] The protective sleeve extends along the length of the cable.

[0011] The pressure plate cooperates with the pressing chamber, and the pressure plate presses the protective sleeve tightly onto the cable.

[0012] The discharge chamber and the pump cylinder are fixedly connected, and the connection point is compatible with the anti-corrosion structure between the cable and the pump cylinder, without affecting the normal function of the anti-corrosion structure.

[0013] The positions of sealant one and sealant two are respectively matched with the shape of the pump cylinder, insulation layer, and cable to ensure sealing effect.

[0014] The inner diameter of the protective sleeve is adapted to the outer diameter of the cable, and the protective sleeve is tightly fitted on the outside of the cable.

[0015] The structure of the pressure plate is adapted to the shape of the protective sleeve, ensuring that the pressure plate can stably achieve the fixing function.

[0016] The beneficial effects of the anti-corrosion structure between the cable and the pump barrel in this submersible electric pump are: The pump cylinder and cable are isolated by an insulation layer, cutting off the galvanic corrosion path; at the same time, sealant one and sealant two are used to fill the tiny gaps to prevent the retention of corrosive media, blocking crevice corrosion at the source. The combination of these two protective mechanisms greatly enhances corrosion resistance. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0018] Figure 1 This is a schematic diagram of a corrosion-resistant structure between the cable and the pump barrel in a submersible electric pump. Figure 2 for Figure 1 A magnified view of part A in the image.

[0019] In the diagram: 1. Pump cylinder; 2. Discharge chamber; 3. Sealant 1; 4. Insulation layer; 5. Sealant 2; 6. Cable; 7. Protective sleeve; 8. Pressure plate. Detailed Implementation

[0020] A corrosion-resistant structure between the cable and the pump barrel in a submersible electric pump includes a pump barrel 1, a discharge chamber 2, a first sealant 3, an insulation layer 4, a second sealant 5, a cable 6, a protective sleeve 7, and a pressure plate 8. One end of the pump barrel 1 is connected to the discharge chamber 2. An insulation layer 4 is provided between the pump barrel 1 and the cable 6. The first sealant 3 is provided on one side of the insulation layer 4, and the second sealant 5 is provided on the other side. A protective sleeve 7 is provided on the outside of the cable 6, and a pressure plate 8 is provided on the protective sleeve 7.

[0021] like Figure 1-2 As shown; The connection between the discharge chamber 2 and the pump cylinder 1 ensures normal fluid transport within the pump. When the electric pump is in an underwater environment, the insulation layer 4 between the cable 6 and the pump cylinder 1 first blocks direct contact between them, preventing electrochemical corrosion due to material differences. Simultaneously, sealant 3 and sealant 5 on both sides of the insulation layer 4 fill the gaps between the pump cylinder 1 and the insulation layer 4, and between the insulation layer 4 and the cable 6, respectively, preventing corrosive media such as water and sediment from seeping into the gaps and eroding the contact surface between the cable 6 and the pump cylinder 1. The protective sleeve 7 on the outside of the cable 6 further provides physical protection for the cable body, reducing wear from external hard object impacts or underwater impurities. The pressure plate 8, through its cooperation with the pump cylinder 1, tightly presses the protective sleeve 7 onto the cable 6, preventing displacement of the protective sleeve 7 under pump vibration or water flow impact, ensuring the continuous protective function of the protective sleeve 7. Ultimately, the multi-layered structure works together to achieve corrosion protection between the cable 6 and the pump cylinder 1.

[0022] The sealant 3 is located between the pump barrel 1 and the insulation layer 4, and is used to achieve a sealing fit between the pump barrel 1 and the insulation layer 4.

[0023] like Figure 1-2 As shown; When a submersible pump operates underwater, if there are gaps at the contact surface between the pump barrel 1 and the insulation layer 4, corrosive underwater media can enter through these gaps, causing corrosion at the contact surface. The sealant 3 located between the pump barrel 1 and the insulation layer 4, after curing, tightly fills these tiny gaps, forming a sealing barrier. This barrier effectively prevents corrosive underwater media from penetrating the contact surface between the pump barrel 1 and the insulation layer 4, avoiding the accumulation of media on the contact surface and subsequent chemical reactions. This prevents corrosion damage to the inner wall of the pump barrel 1 and the outer side of the insulation layer 4, ensuring the stable implementation of the insulation layer 4's subsequent isolation function and indirectly protecting the cable 6.

[0024] The sealant 5 is located between the insulation layer 4 and the cable 6, and is used to achieve a sealed fit between the insulation layer 4 and the cable 6.

[0025] like Figure 1-2 As shown; Because the outer sheath of cable 6 and the insulation layer 4 are made of different materials, their contact surface is prone to corrosion due to medium penetration during long-term underwater immersion. This medium penetration can also affect the cable's insulation performance. Sealant 2 5 is applied between the insulation layer 4 and the cable 6. It has good adhesion and sealing properties, bonding tightly to the inner wall of the insulation layer 4 and the outer sheath of the cable 6, filling the gap between them. During pump operation, this sealing structure prevents moisture, corrosive ions, and other media from entering the contact surface between the insulation layer 4 and the cable 6. This avoids corrosion and damage to the cable 6's outer sheath and prevents the medium from affecting the cable's internal insulation performance, ensuring the cable 6 can safely and stably transmit power.

[0026] The insulation layer 4 completely covers the contact area between the pump cylinder 1 and the cable 6, and is used to isolate the pump cylinder 1 and the cable 6.

[0027] like Figure 1-2 As shown; The pump casing 1 of a submersible pump is typically made of metal, while the outer sheath of the cable 6 is made of polymer material. If the two are in direct contact, a galvanic cell can easily form in the underwater electrolyte environment, leading to electrochemical corrosion. The insulation layer 4 completely covers the contact area between the pump casing 1 and the cable 6. Its insulation properties can cut off the current path between the metal pump casing 1 and the cable 6, fundamentally preventing electrochemical corrosion. At the same time, the completely covered structure can also prevent underwater corrosive media from directly contacting the contact surface between the pump casing 1 and the cable 6, reducing the direct erosion of both by the media. This lays the foundation for the subsequent sealant to function, forming double protection and further improving the anti-corrosion effect.

[0028] The protective sleeve 7 extends along the length of the cable 6.

[0029] like Figure 1-2 As shown; The protective sleeve 7 can prevent underwater debris from directly impacting the outer sheath of the cable 6, reducing frictional damage to the cable 6 caused by water flow. At the same time, it isolates the outer sheath of the cable 6 from corrosive media in the water, preventing corrosion and aging of the outer sheath, extending the service life of the cable 6, and ensuring the stability of power transmission.

[0030] The pressure plate 8 cooperates with the pressing chamber 2, and the pressure plate 8 presses the protective sleeve 7 tightly onto the cable 6.

[0031] like Figure 1-2 As shown; Submersible pumps generate vibrations during operation, and the underwater environment presents water flow impacts. If the protective sleeve 7 is merely fitted over the outside of the cable 6 without securing it, it is prone to displacement or detachment, resulting in partial exposure of the cable 6 to a corrosive environment. The pressure plate 8, in conjunction with the pressure chamber 2, presses the protective sleeve 7 firmly onto the cable 6 through its own structure, ensuring a tight fit between the sleeve and the cable 6 and preventing displacement due to pump vibration or water flow impacts. This securing method ensures that the protective sleeve 7 continuously and stably wraps around the cable 6, preventing corrosion of the cable 6 should the sleeve 7 fail. It also reduces wear caused by relative movement between the sleeve 7 and the cable 6, further guaranteeing the protective effect.

[0032] like Figure 1-2 As shown; As a key component of the submersible pump for fluid delivery, the discharge chamber 2, after being fixedly connected to the pump casing 1, must ensure smooth fluid flow within the pump while avoiding interference with the anti-corrosion structure between the cable 6 and the pump casing 1. The compatibility of the connection point with the anti-corrosion structure means that the size and shape of the connection point will not compress or damage anti-corrosion components such as sealant 3, insulation layer 4, and sealant 5, nor will it create new gaps in the connection area that could allow corrosive media to seep in. During pump operation, the fixed connection between the discharge chamber 2 and the pump casing 1 ensures the integrity of the pump structure, allowing fluid to be delivered along a predetermined path. Meanwhile, the anti-corrosion structure, without interference, performs its sealing, isolation, and protective functions normally, ensuring no corrosion occurs between the cable 6 and the pump casing 1, thus achieving stable operation of the entire pump.

[0033] The positions of sealant 3 and sealant 5 are respectively matched with the shapes of pump cylinder 1, insulation layer 4, and cable 6 to ensure sealing effect.

[0034] like Figure 1-2 As shown; The sealing effect of sealant 3 and sealant 5 directly depends on their fit with the shapes of the contact components. If the sealant placement does not match the shapes of the pump barrel 1, insulation layer 4, and cable 6, the sealant may fail to completely fill the gaps or detach due to excessive compression, affecting the sealing performance. Sealant 3 is positioned to match the inner wall of the pump barrel 1 and the outer surface of the insulation layer 4, allowing it to completely adhere to both surfaces and fill all tiny gaps. Sealant 5 is positioned to match the inner wall of the insulation layer 4 and the outer sheath of the cable 6, similarly ensuring a tight fit and a complete seal. When the electric pump operates underwater, this matching design effectively prevents corrosive media from penetrating the contact surfaces, avoiding corrosion problems caused by incomplete sealing and ensuring the stable and reliable sealing function of the corrosion-resistant structure.

[0035] The inner diameter of the protective sleeve 7 is adapted to the outer diameter of the cable 6, and the protective sleeve 7 is tightly fitted on the outside of the cable 6.

[0036] like Figure 1-2 As shown; If the inner diameter of the protective sleeve 7 does not match the outer diameter of the cable 6, and is too large, a gap will form between it and the cable 6, allowing corrosive media to easily enter and corrode the cable 6; if it is too small, it will be difficult to install, or it may cause compression damage to the cable 6's outer sheath after installation. The inner diameter of the protective sleeve 7 should match the outer diameter of the cable 6, allowing it to fit tightly on the outside of the cable 6 without any noticeable gap. During pump operation, this tight fit prevents underwater corrosive media from entering the space between the protective sleeve 7 and the cable 6, avoiding corrosion of the cable 6's outer sheath. Simultaneously, the tight fit reduces relative friction between the protective sleeve 7 and the cable 6, preventing damage to the inner wall of the protective sleeve 7 or the outer sheath of the cable 6 due to friction, ensuring the continued effectiveness of the protective sleeve 7's protective function.

[0037] The structure of the pressure plate 8 is adapted to the shape of the protective sleeve 7, ensuring that the pressure plate 8 can stably achieve the fixing function.

[0038] like Figure 1-2 As shown; If the structure of the pressure plate 8 is incompatible with the shape of the protective sleeve 7, the contact area between the pressure plate 8 and the protective sleeve 7 will be too small or the force will be uneven, making it impossible to stably press the protective sleeve 7, and it may even damage the protective sleeve 7 due to excessive local pressure. The structure of the pressure plate 8 is adapted to the shape of the protective sleeve 7, allowing it to fully contact the surface of the protective sleeve 7. During pressing, the pressure is evenly transmitted to the protective sleeve 7, ensuring that the protective sleeve 7 is tightly fixed to the cable 6 and will not shift due to pump vibration or water flow impact, while also preventing damage to the protective sleeve 7 due to excessive local pressure. This adaptive design ensures that the pressure plate 8 can stably achieve its fixing function, providing a guarantee for the protective sleeve 7 to continuously perform its protective function, thereby maintaining the stability and reliability of the entire anti-corrosion structure.

Claims

1. A corrosion-resistant structure between the cable and the pump barrel in a submersible electric pump, comprising a pump barrel (1), a discharge chamber (2), a first sealant (3), an insulation layer (4), a second sealant (5), a cable (6), a protective sleeve (7), and a pressure plate (8), characterized in that: One end of the pump cylinder (1) is connected to the discharge chamber (2). An insulation layer (4) is provided between the pump cylinder (1) and the cable (6). One side of the insulation layer (4) is provided with sealant one (3) and the other side is provided with sealant two (5). A protective sleeve (7) is provided on the outside of the cable (6). A pressure plate (8) is provided on the protective sleeve (7).

2. The anti-corrosion structure between the cable and the pump barrel in a submersible electric pump according to claim 1, characterized in that: The sealant (3) is located between the pump barrel (1) and the insulation layer (4) to achieve a sealing fit between the pump barrel (1) and the insulation layer (4).

3. The anti-corrosion structure between the cable and the pump barrel in a submersible electric pump according to claim 2, characterized in that: The sealant 2 (5) is located between the insulation layer (4) and the cable (6) to achieve a sealed fit between the insulation layer (4) and the cable (6).

4. The anti-corrosion structure between the cable and the pump barrel in a submersible electric pump according to claim 3, characterized in that: The insulation layer (4) completely covers the contact area between the pump cylinder (1) and the cable (6) to isolate the pump cylinder (1) and the cable (6).

5. The anti-corrosion structure between the cable and the pump barrel in a submersible electric pump according to claim 4, characterized in that: The protective sleeve (7) extends along the length of the cable (6).

6. The anti-corrosion structure between the cable and the pump barrel in a submersible electric pump according to claim 5, characterized in that: The pressure plate (8) cooperates with the pressing chamber (2) to press the protective sleeve (7) onto the cable (6).

7. The anti-corrosion structure between the cable and the pump barrel in a submersible electric pump according to claim 6, characterized in that: The discharge chamber (2) and the pump cylinder (1) are fixedly connected. The connection between the two is compatible with the anti-corrosion structure between the cable (6) and the pump cylinder (1) and does not affect the normal function of the anti-corrosion structure.

8. The anti-corrosion structure between the cable and the pump barrel in a submersible electric pump according to claim 7, characterized in that: The positions of sealant one (3) and sealant two (5) are respectively matched with the shape of the pump cylinder (1), insulation layer (4) and cable (6) to ensure sealing effect.

9. The anti-corrosion structure between the cable and the pump barrel in a submersible electric pump according to claim 8, characterized in that: The inner diameter of the protective sleeve (7) is adapted to the outer diameter of the cable (6), and the protective sleeve (7) is tightly fitted on the outside of the cable (6).

10. The anti-corrosion structure between the cable and the pump barrel in a submersible electric pump according to claim 9, characterized in that: The structure of the pressure plate (8) is compatible with the shape of the protective sleeve (7), ensuring that the pressure plate (8) can stably achieve the fixing function.

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