End cap and shielded pump using the same

Abstract

The utility model discloses a kind of end cap and the shielding pump applied thereto, including metal insert and injection molding part, metal insert part outer surface is wrapped by injection molding part, the top surface of metal insert is provided with axial annular boss, the side of axial annular boss is provided with first sealing groove for installing rubber sealing ring, the top surface of injection molding part is provided with second sealing groove for installing rubber sealing ring barrier external moisture, first sealing groove and second sealing groove form a dry cavity, by optimizing sealing fit shape structure, reduce rubber-coated area, first sealing groove is set on metal insert, medium is sealed again in first sealing groove, ensure that medium will not penetrate motor stator cavity and capacitor cavity through end cap injection molding and metal insert combination surface, improve end cap product pass rate and promote whole machine sealing reliability, by setting second sealing groove on injection molding part, so that first sealing groove and second sealing groove form a dry cavity, avoid water pump in external extreme working condition.

Description

Technical Field

[0001] This utility model relates to an end cap and its application in a shielded pump. Background Technology

[0002] Water pumps used for heat dissipation in fuel cells are typically canned pumps. In order to achieve the function of medium insulation, the front end cover structure is usually made of insulating materials such as plastic to achieve the insulation effect between the pump head and the high voltage components of the motor and electronic control. Water pumps designed with this solution usually cannot meet the requirements for shielding radiated emission signals because the end cover material cannot play a shielding role, resulting in failure to meet the EMC test requirements of fuel cell systems for water pump systems.

[0003] The existing end cap has a metal insert molded inside, covering the entire front section of the motor. The metal insert has protrusions on its periphery for connection with the capacitors inside the capacitor box in the housing, achieving a shielding function. After the end cap is formed, the front part of the end cap contacts and conducts through the volute flow channel. Because the injection-molded part of the end cap and the metal insert are two different materials and the encapsulated area is large, it is difficult to form a dense structure after injection molding. This makes the end cap prone to leakage, allowing the pump medium to enter the motor stator cavity and capacitor cavity, leading to sealing and insulation failures. Furthermore, because there is only one sealing ring on the end cap, in extreme conditions, such as when the pump is exposed to rain or submerged in water, the external water and internal medium are only isolated by the sealing ring, easily leading to poor insulation between the medium and the external housing. Existing technical problems: The two different materials of the injection-molded part of the end cap and the metal insert make it difficult to achieve a complete seal; the sealing surface design extending to the injection-molded part cannot meet the requirements for complete medium sealing, increasing the processing difficulty of the end cap, reducing the safety factor and product qualification rate; and the single sealing groove is insufficient to meet the insulation requirements of the fuel cell water pump medium under extreme conditions. Summary of the Invention

[0004] The purpose of this utility model is to provide an end cap and its application in a shielded pump, which solves the technical problems in the prior art where the two different materials of the injection-molded part and the metal insert part of the end cap make it difficult to achieve a complete seal, and the sealing surface is designed on the injection-molded part, which cannot meet the requirements for complete sealing of the medium, increases the processing difficulty of the end cap, and reduces the safety factor and product qualification rate.

[0005] The technical solution of this utility model is implemented as follows:

[0006] This utility model provides an end cap, characterized in that it includes a metal insert and an injection molding part. The metal insert has a shaft extension hole in the middle. The outer surface of the metal insert is wrapped by the injection molding part. An axial annular boss is provided in the middle of the top surface of the metal insert. A first sealing groove is provided on the side of the axial annular boss for installing a rubber sealing ring. A second sealing groove is provided on the top surface of the injection molding part for installing a rubber sealing ring to block external moisture. A drying cavity is formed between the first sealing groove and the second sealing groove.

[0007] The injection molding part described above includes a first annular end plate and a second annular end plate. A second sealing groove is arranged on the top surface of the first annular end plate. A mounting groove is excavated on the bottom surface of the first annular end plate. A metal insert is embedded in the mounting groove. An axial annular boss of the metal insert extends from the middle of the first annular end plate. The second annular end plate is installed outside the mounting groove to fix the metal insert inside the first annular end plate.

[0008] The mounting groove described above has several first mounting lugs on its edge, each first mounting lug having a first mounting hole. The metal insert has a clearance groove on its edge corresponding to the first mounting lug. The second annular end plate has a second mounting hole corresponding to the first mounting hole. The screw passes through the first mounting hole and locks into the second mounting hole.

[0009] The bottom surface of the first annular end plate described above is provided with a notch, which is connected to the mounting groove. The edge of the metal insert protrudes from the boss, which is engaged in the notch and exposed to the outside.

[0010] The aforementioned metal insert is made of stainless steel.

[0011] The axial annular boss described above has screw holes on its end face.

[0012] The aforementioned metal insert has several through holes located within the axial annular boss.

[0013] A canned motor pump includes a pump housing assembly, an impeller, and a motor, wherein: it includes a motor housing assembly, a stator assembly, a rotor assembly, and a shaft; the motor housing assembly includes a front end cover, a housing sleeve, and a rear end cover; characterized in that: the front end cover is the end cover described above.

[0014] Compared with the prior art, this utility model has the following advantages:

[0015] 1. This utility model includes a metal insert and an injection molding part. The metal insert has a shaft extension hole in the middle. The outer surface of the metal insert is wrapped by the injection molding part. An axial annular boss is provided in the middle of the top surface of the metal insert. A first sealing groove is provided on the side of the axial annular boss for installing a rubber sealing ring. A second sealing groove is provided on the top surface of the injection molding part for installing a rubber sealing ring to block external moisture. A drying chamber is formed between the first sealing groove and the second sealing groove. By optimizing the sealing fit shape and structure and reducing the rubber covering area, the first sealing groove of the volute flow channel is set on the metal insert, and the medium is sealed inside the first sealing groove. This ensures that the medium will not penetrate into the motor stator cavity and capacitor cavity through the joint surface between the end cap injection molding and the metal insert, thereby improving the end cap product qualification rate and enhancing the overall sealing reliability. In addition, by setting the second sealing groove on the injection molding part, a drying chamber is formed between the first sealing groove and the second sealing groove, avoiding the problem of poor insulation between the fuel cell water pump water cavity and the outer shell when the water pump encounters extreme external conditions, such as rain, wading, or immersion in water.

[0016] 2. Other advantages of this utility model are described in detail in the embodiment section of the specification. Attached Figure Description

[0017] Figure 1 A perspective view provided for this utility model;

[0018] Figure 2 Another perspective view provided for this utility model;

[0019] Figure 3 Exploded view provided for this utility model;

[0020] Figure 4 A front view provided for this utility model;

[0021] Figure 5 for Figure 4 Sectional view of AA. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] Example 1:

[0024] like Figures 1 to 5As shown, this embodiment provides an end cap, characterized in that it includes a metal insert 1 and an injection-molded part 2. The metal insert 1 has a shaft extension hole 100 in the middle. The outer surface of part of the metal insert 1 is wrapped by the injection-molded part 2. An axial annular boss 11 is provided in the middle of the top surface of the metal insert 1. A first sealing groove 12 is provided on the side of the axial annular boss 11 for installing a rubber sealing ring. A second sealing groove 21 is provided on the top surface of the injection-molded part 2 for installing a rubber sealing ring to block external moisture. A drying chamber 200 is formed between the first sealing groove 12 and the second sealing groove 21. By optimizing the sealing... By combining the shape and structure to reduce the encapsulation area, the first sealing groove of the volute flow channel is set on the metal insert, sealing the medium within the first sealing groove. This ensures that the medium will not penetrate into the motor stator cavity and capacitor cavity through the joint surface between the end cap injection molding and the metal insert, improving the end cap product qualification rate and enhancing the overall sealing reliability. In addition, by setting a second sealing groove on the injection molding part, a dry cavity is formed between the first and second sealing grooves, preventing the water pump from encountering extreme external conditions, such as rain, wading, or immersion, which could lead to poor insulation between the fuel cell water pump water cavity and the outer shell.

[0025] The aforementioned injection molding part 2 includes a first annular end plate 22 and a second annular end plate 23. A second sealing groove 21 is arranged on the top surface of the first annular end plate 22. A mounting groove 221 is excavated on the bottom surface of the first annular end plate 22. The metal insert 1 is embedded in the mounting groove 221. The axial annular boss 11 of the metal insert 1 extends from the middle of the first annular end plate 22. The second annular end plate 23 is installed outside the mounting groove 221 to fix the metal insert 1 inside the first annular end plate 22. The structure is reasonably arranged.

[0026] The mounting groove 221 is provided with several first mounting lugs 2211 on its edge. Each first mounting lug 2211 has a first mounting hole 2212. The metal insert 1 is provided with a clearance groove 10 corresponding to the first mounting lug 2211 on its edge. The second annular end plate 23 is provided with a second mounting hole 231 corresponding to the first mounting hole 2212. The screws are passed through the first mounting hole 2212 and locked to the second mounting hole 231, resulting in a simple installation structure.

[0027] The bottom surface of the first annular end plate 22 is provided with a notch 222, which is connected to the mounting groove 221. The edge of the metal insert 1 protrudes from the boss 13, which is locked in the notch 222 and exposed to the outside, so as to facilitate connection and conduction with the capacitor in the capacitor box of the housing. The structure is reasonably arranged.

[0028] The aforementioned metal insert 1 is made of stainless steel.

[0029] The aforementioned axial annular boss 11 has screw holes 14 on its end face, which facilitates installation with the shielding sleeve and has a reasonable structural layout.

[0030] The aforementioned metal insert 1 has several through holes 15 located within the axial annular boss 11.

[0031] Example 2:

[0032] A canned motor pump includes a pump housing assembly, an impeller, and a motor, wherein: it includes a motor housing assembly, a stator assembly, a rotor assembly, and a shaft; the motor housing assembly includes a front cover, a housing sleeve, and a rear cover; characterized in that: the front cover is the end cover described in Embodiment 1.

[0033] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited thereto. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model are equivalent substitutions and are included within the protection scope of the present utility model.

Claims

1. An end cap, characterized in that: It includes a metal insert (1) and an injection molding part (2). The metal insert (1) has a shaft extension hole (100) in the middle. The outer surface of the metal insert (1) is partially wrapped by the injection molding part (2). An axial annular boss (11) is provided in the middle of the top surface of the metal insert (1). A first sealing groove (12) is provided on the side of the axial annular boss (11) for installing a rubber sealing ring. A second sealing groove (21) is provided on the top surface of the injection molding part (2) for installing a rubber sealing ring to block external moisture. A drying chamber (200) is formed between the first sealing groove (12) and the second sealing groove (21).

2. An end cap according to claim 1, characterized in that: The injection molding part (2) includes a first annular end plate (22) and a second annular end plate (23). A second sealing groove (21) is arranged on the top surface of the first annular end plate (22). A mounting groove (221) is carved out on the bottom surface of the first annular end plate (22). A metal insert (1) is embedded in the mounting groove (221). An axial annular boss (11) of the metal insert (1) extends from the middle of the first annular end plate (22). The second annular end plate (23) is installed outside the mounting groove (221) to fix the metal insert (1) in the first annular end plate (22).

3. An end cap according to claim 2, characterized in that: The edge of the mounting groove (221) is provided with a plurality of first mounting lugs (2211), and the first mounting lugs (2211) are provided with first mounting holes (2212). The edge of the metal insert (1) is provided with clearance grooves (10) corresponding to the first mounting lugs (2211). The second annular end plate (23) is provided with second mounting holes (231) corresponding to the first mounting holes (2212). The screws pass through the first mounting holes (2212) and lock together with the second mounting holes (231).

4. An end cap according to claim 3, characterized in that: The bottom surface of the first annular end plate (22) is provided with a notch (222), which is connected to the mounting groove (221). The edge of the metal insert (1) protrudes from the boss (13), which is fitted into the notch (222) and exposed to the outside.

5. An end cap according to claim 1, 2, 3, or 4, characterized in that: The metal insert (1) is made of stainless steel.

6. An end cap according to claim 5, characterized in that: The end face of the axial annular boss (11) is provided with screw holes (14).

7. An end cap according to claim 6, characterized in that: The metal insert (1) has several through holes (15) located in the axial annular boss (11).

8. A canned motor pump, comprising a pump casing assembly, an impeller, and a motor, wherein: The device includes a motor housing assembly, a stator assembly, a rotor assembly, and a shaft. The motor housing assembly includes a front cover, a housing sleeve, and a rear cover. The front cover is an end cover as described in any one of claims 1 to 7.

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