Waterproof sealing structure for power line of submersible sewage pump

Abstract

The utility model relates to the technical field of water pump power line waterproofing, in particular to a submersible sewage pump power line waterproof sealing structure which comprises a pump body, a cable outlet hole is reserved in the pump body, a cable sleeve is arranged at the position of the cable outlet hole, the two ends of the cable sleeve are open, and the cable sleeve is made of elastic materials. The power line comprises a wrapping protection layer and a plurality of electric wires, the plurality of electric wires are led out from the interior of the pump body and extend out of the pump body through the cable sleeve, and the wrapping protection layer wraps the parts, located in the cable sleeve and outside the pump body, of the plurality of electric wires; the wrapping protection layer is arranged in the pump body so that the parts, located in the pump body, of the wires can be exposed, the wrapping protection layer is in interference fit with the cable sleeve, and the position, located in the wire outlet hole, in the pump body is filled with a sealing glue layer. The waterproof sealing effect of the power line of the pump body can be improved, and the safety performance of the pump body is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of waterproofing water pump power cords, and in particular to a waterproof sealing structure for a submersible sewage pump power cord. Background Technology

[0002] Submersible sewage pumps are key equipment in sewage treatment and drainage, and are widely used in various complex working environments. During their operation, the power cord is an important component to ensure power transmission. However, since submersible sewage pumps often work in humid or even completely submerged environments, their exposed power cords face many challenges.

[0003] In existing technologies, although the surface of the power cord of a submersible sewage pump is equipped with a protective layer, this layer is prone to cracking after long-term use due to various factors such as water flow impact, mechanical friction, and chemical corrosion. Once the protective layer cracks, external moisture can easily penetrate into the power cord through the crack. Since the power cord is connected to the pump, moisture can further enter the pump through the gaps between the wires inside the power cord and eventually reach the motor. Over time, the humid air that has entered the motor accumulates and adheres to conductive components such as the enameled wires inside the motor, forming water droplets. This can easily cause the pump to leak, short-circuit, and burn out, leading to pump failure. Therefore, how to design a waterproof sealing structure for the power cord of a submersible sewage pump to effectively prevent moisture infiltration due to cracked protective layers is a technical problem that enterprise technicians urgently need to solve. Utility Model Content

[0004] To address the shortcomings of the prior art, this application provides a waterproof sealing structure for the power cord of a submersible sewage pump.

[0005] The above-mentioned inventive objective of this application is achieved through the following technical solutions:

[0006] The pump body has a reserved outlet hole, and a cable sleeve is provided at the outlet hole. The cable sleeve is open at both ends and is made of elastic material.

[0007] The power cord includes a protective layer and several wires. The wires extend from inside the pump body, through the cable sleeve, to the outside of the pump body. The protective layer covers the portions of the wires inside the cable sleeve and outside the pump body, so that the portions of the wires inside the pump body are exposed. The protective layer is press-fitted with the cable sleeve. The pump body is filled with a sealant layer at the location of the outlet hole.

[0008] By adopting the above technical solution, firstly, the cable sleeve is made of elastic material and its inner diameter is interference-fitted with the protective layer of the power cord. The inner and outer sides of the cable sleeve can maintain a tight wrapping of the power cord and a tight assembly with the outlet hole through their own deformation, achieving mechanical protection and elastic dynamic sealing of the power cord. Secondly, the sealant layer filled at the outlet hole of the pump body is in direct contact with the exposed wire inside the power cord, so that the solid seal formed after the sealant layer cures can seal the gap between the wires through physical adhesion. At the same time, it forms a double sealing interface with the inner side of the cable sleeve, which can cut off the channel for water vapor penetration. Through the design of this layered waterproof structure of the power cord, that is, the protective layer is kept intact inside the cable sleeve and outside the pump body, while the exposed wire is actively peeled off inside the pump body, even if water vapor breaks through the protective layer of the power cord located outside the pump body or inside the cable sleeve, it will be intercepted by the sealant layer, preventing it from penetrating along the wire axis towards the motor, thereby achieving static sealing inside the power cord. This forms a multi-layered waterproof barrier for the power cord from the outside to the inside, which can improve the waterproof sealing effect of the power cord of the pump body and improve the safety performance of the pump body.

[0009] In a preferred embodiment, the present application may be further configured such that: both the cable sleeve and the outlet hole are flared in shape, and their inner diameters gradually decrease from the inside of the pump body to the outside, and the cable sleeve and the outlet hole are interference-fitted.

[0010] By adopting the above technical solution and using a flared design, the cable sleeve and the outlet hole are more fully and tightly fitted.

[0011] In a preferred embodiment, this application may be further configured such that the bevel angle of the cable sleeve and the outlet hole is 2°-10°.

[0012] In a preferred embodiment, the present application may be further configured such that: the end of the cable sleeve located inside the pump body extends with a positioning flange for abutting against the pump body.

[0013] By adopting the above technical solution, the positioning flange and the inner end face of the pump body form a mechanical positioning, which can prevent the cable sleeve from detaching from the pump body, and at the same time facilitate the installation of the cable sleeve by the installer.

[0014] In a preferred embodiment, this application may be further configured such that: a buckle extends outward from the outer side of the cable sleeve, the buckle being trumpet-shaped and its size gradually decreasing from the inside to the outside of the pump body.

[0015] By adopting the above technical solution, the reverse-clamping and positioning flange can prevent the cable sleeve from moving axially at the outlet hole. Furthermore, the trumpet-shaped reverse-clamping structure facilitates the reverse-clamping to disengage from the pump body through the outlet hole for a limiting function.

[0016] In a preferred embodiment, the present application may be further configured such that the cable sleeve is made of silicone material.

[0017] By adopting the above technical solutions, silicone material is not prone to aging, and its excellent elasticity ensures long-term sealing performance.

[0018] In a preferred embodiment, the cable sleeve may be further configured such that it is made of silicone material with a hardness of 40°-50°.

[0019] In a preferred embodiment, the sealant layer may be further configured to be made of epoxy resin.

[0020] By adopting the above technical solution, the sealant layer made of epoxy resin has low water absorption and high breakdown voltage, which can meet the requirements of waterproofing and insulation protection.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. The cable sleeve is made of elastic material, and its inner diameter is interference-fitted with the protective layer of the power cord. The inner and outer sides of the cable sleeve can maintain a tight wrapping of the power cord and a tight assembly with the outlet hole through their own deformation, achieving mechanical protection and elastic dynamic sealing of the power cord. Secondly, the sealant layer filled at the outlet hole in the pump body is in direct contact with the exposed wire inside the power cord, so that the solid sealant layer formed after curing fills the gap between the wires through physical adhesion, and forms a double sealing interface with the inner side of the cable sleeve, which can cut off the channel for water vapor penetration. Through the design of this multi-layer waterproof structure of the power cord, that is, the protective layer is kept intact inside the cable sleeve and outside the pump body, while the exposed wire is actively stripped inside the pump body, even if water vapor breaks through the protective layer of the power cord outside the pump body or inside the cable sleeve, it will be intercepted by the sealant layer, preventing it from penetrating along the wire axis towards the motor, thereby achieving static sealing inside the power cord, and thus forming a multi-layer waterproof barrier from the outside to the inside of the power cord, which can improve the waterproof sealing effect of the power cord of the pump body and improve the safety performance of the pump body.

[0023] 2. The positioning flange forms a mechanical positioning with the end face of the outlet hole inside the pump body, which can prevent the cable sleeve from detaching from the pump body and facilitate the installation of the cable sleeve by the installer.

[0024] 3. The reverse-clamping positioning flange can prevent the cable sleeve from moving axially at the outlet hole. The trumpet-shaped reverse-clamping structure can facilitate the reverse-clamping to disengage from the pump body through the outlet hole end face for a limiting function. Attached Figure Description

[0025] Figure 1This is a schematic diagram of the waterproof sealing structure of the submersible sewage pump power cord in this application;

[0026] Figure 2 yes Figure 1 A magnified view of part A in the diagram.

[0027] Reference numerals: 1. Pump body; 2. Power cord; 21. Protective wrapping layer; 22. Wire; 3. Outlet hole; 4. Cable sleeve; 5. Plug; 6. Sealing layer; 7. Positioning flange; 8. Reverse snap. Detailed Implementation

[0028] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of this application, including various details to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0029] It should be noted that the terms "first," "second," etc., used in this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. The implementation methods described in the following exemplary embodiments do not represent all implementation methods consistent with this disclosure.

[0030] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0031] The following description, with reference to the accompanying drawings, illustrates a waterproof sealing structure for a submersible sewage pump power cord.

[0032] like Figure 1 and Figure 2As shown, the waterproof sealing structure of the submersible sewage pump power cord includes a pump body 1 and a power cord 2. The pump body 1 has a pre-drilled outlet hole 3, and a cable sleeve 4 is installed at the outlet hole 3. The cable sleeve 4 is open at both ends and is made of elastic material. The power cord 2 includes a protective layer 21 and several wires 22. The wires 22 are led out from inside the pump body 1, extend through the cable sleeve 4 to the outside of the pump body 1. Typically, one end of the wire 22 is electrically connected to the motor inside the pump body 1, and the other end of the wire 22 extends to the outside of the pump body 1 and is connected to the power supply. The plug 5 is a cable 2. A protective layer 21 is wrapped around the portion of several wires 22 located inside the cable sleeve 4 and outside the pump body 1, so that the portion of the wires 22 inside the pump body 1 is exposed. The protective layer 21 is press-fitted with the cable sleeve 4. The pump body 1 is filled with a sealant layer 6 at the position of the outlet hole 3. The cable sleeve 4 is made of elastic material and its inner diameter is press-fitted with the protective layer 21 of the power cord 2. The inner and outer sides of the cable sleeve 4 can maintain a tight wrapping of the power cord 2 through its own deformation. The tight assembly with the outlet hole 3 achieves mechanical protection and elastic dynamic sealing of the power cord 2 externally. The sealant layer 6 filling the outlet hole 3 inside the pump body 1 directly contacts the exposed wire 22 inside the power cord 2, allowing the solid sealant layer 6, after curing, to fill the gaps between the wires 22 through physical adhesion. Simultaneously, it forms a double-sealed interface with the inner side of the cable sleeve 4, cutting off the channel for water vapor penetration. Through the multi-layer waterproof structure design of the power cord 2—that is, the protective layer 21 remains intact inside the cable sleeve 4 and outside the pump body 1, while the wires 22 are actively exposed inside the pump body 1—even if water vapor breaks through the protective layer 21 located outside the pump body 1 or inside the cable sleeve 4, it will be intercepted by the sealant layer 6, preventing it from penetrating along the wire 22 axis towards the motor. This achieves static sealing inside the power cord 2, thus forming a multi-layer waterproof barrier from the outside in, improving the waterproof sealing effect of the power cord 2 in the pump body 1 and enhancing the safety performance of the pump body 1.

[0033] It should be noted that the protective layer 21 usually refers to the outermost rubber sheath of the power cord 2. The protective layer 21 wraps around the part of the wires 22 located inside the cable sleeve 4 and outside the pump body 1. Usually, the part of the wires 22 inside the pump body 1 can be exposed by cutting or trimming, so that the gap between the wires 22 can be filled with the sealant layer 6, so that the gap between the wires 22 is filled and the protective layer 21 of the external power cord 2 is not broken, so that external moisture can penetrate into the pump body 1 from the outlet hole 3.

[0034] Preferably, both the cable sleeve 4 and the outlet hole 3 are funnel-shaped, and their inner diameters gradually decrease from the inside of the pump body 1 to the outside. The cable sleeve 4 and the outlet hole 3 are also interference-fitted. By adopting the funnel-shaped design, the cable sleeve 4 and the outlet hole 3 are more fully and tightly fitted together.

[0035] Furthermore, the bevel angle of the cable sleeve 4 and the outlet hole 3 is preferably 2°-10°. The trumpet-shaped design combined with the bevel angle within this range can avoid material fatigue caused by stress concentration while ensuring a tight fit, thereby improving the service life of the cable sleeve 4 and the pump body 1.

[0036] Preferably, the end of the cable sleeve 4 located inside the pump body 1 extends with a positioning flange 7. The positioning flange 7 is used to abut against the pump body 1. The positioning flange 7 forms a mechanical positioning with the inner end face of the pump body 1, which can prevent the cable sleeve 4 from detaching from the pump body 1, and at the same time facilitate the installation of the cable sleeve 4 by the installer.

[0037] Furthermore, a reverse buckle 8 is provided on the outer side of the cable sleeve 4. The reverse buckle 8 is trumpet-shaped and its size gradually decreases from the inside of the pump body 1 to the outside. The reverse buckle 8, in conjunction with the positioning flange 7, can prevent the cable sleeve 4 from moving axially at the outlet hole 3. Moreover, the trumpet-shaped reverse buckle 8 structure makes it easy for the reverse buckle 8 to disengage from the pump body 1 through the outlet hole 3 for a limiting function.

[0038] Preferably, the cable sleeve 4 is made of silicone material, which is not prone to aging and, combined with its excellent elasticity, can ensure long-term sealing performance.

[0039] Specifically, the cable sleeve 4 is made of silicone material with a hardness of 40°-50°. Using silicone material within this hardness range can balance the elasticity and support of the silicone material, so as to provide sufficient elastic support for the protective layer 21 while ensuring the structural strength of the cable sleeve 4.

[0040] Preferably, the sealant layer 6 is made of epoxy resin. The sealant layer 6 made of epoxy resin has low water absorption and high breakdown voltage, which can meet the requirements of waterproofing and insulation protection.

[0041] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A waterproof sealing structure for a submersible sewage pump power cord, characterized in that, include: Pump body (1), the pump body (1) has a reserved outlet hole (3), a cable sleeve (4) is provided at the outlet hole (3), the cable sleeve (4) is open at both ends, and the cable sleeve (4) is made of elastic material; The power cord (2) includes a protective layer (21) and a plurality of wires (22). The plurality of wires (22) are led out from inside the pump body (1) and extend to the outside of the pump body (1) via the cable sleeve (4). The protective layer (21) wraps around the portion of the plurality of wires (22) located inside the cable sleeve (4) and outside the pump body (1) so that the portion of the plurality of wires (22) located inside the pump body (1) is exposed. The protective layer (21) is press-fitted with the cable sleeve (4). The pump body (1) is filled with a sealant layer (6) at the position of the outlet hole (3).

2. The waterproof sealing structure for a submersible sewage pump power cord as described in claim 1, characterized in that, The cable sleeve (4) and the outlet hole (3) are both trumpet-shaped, and their inner diameters gradually decrease from the inside of the pump body (1) to the outside. The cable sleeve (4) and the outlet hole (3) are interference fit.

3. The waterproof sealing structure for a submersible sewage pump power cord as described in claim 2, characterized in that, The bevel angle of the cable sleeve (4) and the outlet hole (3) is 2°-10°.

4. The waterproof sealing structure for a submersible sewage pump power cord as described in claim 1, characterized in that, The cable sleeve (4) is provided with a positioning flange (7) extending from the end inside the pump body (1), and the positioning flange (7) is used to abut against the pump body (1).

5. The waterproof sealing structure for a submersible sewage pump power cord as described in claim 1, characterized in that, The cable sleeve (4) is provided with a buckle (8) extending outward. The buckle (8) is horn-shaped and its size gradually decreases from the inside of the pump body (1) to the outside.

6. The waterproof sealing structure for a submersible sewage pump power cord as described in claim 1, characterized in that, The cable sleeve (4) is made of silicone.

7. The waterproof sealing structure for a submersible sewage pump power cord as described in claim 6, characterized in that, The cable sleeve (4) is made of silicone material with a hardness of 40°-50°.

8. The waterproof sealing structure for a submersible sewage pump power cord as described in claim 1, characterized in that, The sealant layer (6) is made of epoxy resin.

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