Miniature shielding electric pump with foreign matter retention prevention structure

Abstract

The utility model discloses a miniature shielding electric pump with a foreign matter retention prevention structure, which comprises a pump cover and a pump body, and the pump body comprises an impeller rotor assembly and a pump shaft; the pump cover comprises a tubular water outlet pipe and a water inlet pipe, a pump shaft supporting seat is arranged at the bottom of the inner wall of the water inlet pipe, the pump shaft supporting seat and the pump cover are integrally formed, the pump shaft supporting seat comprises a supporting part and a main body part, the main body part is supported by the supporting part, one end of the main body part is provided with a blind hole, and one end of the pump shaft is connected with the blind hole; a foreign matter discharging groove penetrating through the blind hole is formed in the side wall of the blind hole and / or a filtering hole is formed in the bottom of the blind hole and communicates with the interior and exterior of the bottom of the blind hole. The foreign matter discharging grooves and / or the filtering holes can discharge impurities separated out by friction between the pump shaft supporting base and the impeller rotor assembly, unsmooth rotation of the rotor is prevented, and the operation efficiency of the rotor is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of miniature shielding electric pump containing anti-foreign retention structure, and IPC classification can belong to F04D 13 / 06. BACKGROUND

[0002] The rotor of a conventional miniature shielding electric pump is supported by a pump shaft on a graphite bearing. When the pump is in operation, the rotational speed is very high (above 5000 RPM). During long-time high-speed operation, there is a certain amount of wear between the graphite bearing of the impeller rotor assembly and the pump shaft support seat of the pump cover. The graphite powder or other substances separated out are retained at the top end of the pump shaft, which makes the rotor rotation difficult and leads to low rotation efficiency. The conventional structure for discharging these retained substances can be found in patent documents CN220457190U and CN113790161A, but the actual effect is not good.

[0003] Common knowledge and terms can be found in Chinese patent CN211501069U "A miniature shielding pump", Machinery Industry Press 1978-1983 edition or 1997 edition "Mechanical Engineering Handbook" and "Electrical Engineering Handbook", Machinery Industry Press 2014 edition "Pump Theory and Technology", and national standard GB / T 7021 "Nomenclature for Centrifugal Pumps". UTILITY MODEL CONTENT

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a miniature shielding electric pump containing an anti-foreign retention structure, which can more effectively prevent graphite powder or other impurities from accumulating at the top end of the pump shaft compared with the conventional design.

[0005] The utility model provides a kind of miniature shielding electric pump containing anti-foreign retention structure, comprising: pump cover and pump body, the pump body includes impeller rotor assembly and pump shaft, the pump cover includes tubular water outlet pipe and water inlet pipe, the inner wall bottom end of water inlet pipe is provided with pump shaft support seat, the pump shaft support seat is axially limited to the impeller rotor assembly, the pump shaft support seat is integrally formed with the pump cover, the main part of the pump shaft support seat is supported by its support part, the lower end of this main part is provided with axial blind hole, the upper end of the pump shaft is inserted into the blind hole, the side wall of the blind hole is provided with groove (abbreviated as discharge impurity groove) for discharging foreign matter and / or filter hole is arranged in the bottom of the blind hole, which communicates the inside and outside of the bottom of the blind hole.

[0006] According to the micro shield electric pump with the foreign matter retention structure preventing structure, since the foreign matter discharging grooves and / or the filtering holes are designed to be through the inside and outside of the blind hole, the overall radial flow structure generates centrifugal force based on the rotating motion of the rotor assembly, compared with the traditional design, can effectively discharge the retention matter of the background art, prevents impurities from being discharged from the blind hole in time, thereby causing poor rotation of the rotor, improves the rotation efficiency of the rotor, avoids causing locked-rotor failure, and improves the service life of the bearing.

[0007] According to some embodiments of the utility model, the port of blind hole is provided with a plurality of arc bosses along the circumference of axis, and the adjacent two arc bosses are through with the foreign matter discharging groove.

[0008] According to some embodiments of the utility model, the impeller rotor assembly includes a rotor, an impeller and a graphite bearing, the graphite bearing, the impeller and the rotor are sequentially arranged on the outer periphery of the pump shaft, the port of the blind hole is provided with an annular ceramic gasket, and the inner wall of the annular ceramic gasket has a gap with the outer periphery of the pump shaft, the annular ceramic gasket is installed at the opening end of the blind hole, and the graphite bearing is arranged on the rotor, so that the annular ceramic gasket directly rubs with the graphite bearing when the rotor rotates at high speed, the separated graphite powder is discharged from the foreign matter discharging groove, the direct friction of the pump shaft support seat impeller rotor assembly is avoided, and the wear resistance of the impeller rotor assembly is improved.

[0009] According to some embodiments of the utility model, the outer wall of the arc boss further extends a first side wall in the axial direction, a first gap is formed between the adjacent two first side walls, a first protrusion corresponding to the first gap is formed on the outer peripheral wall of the annular ceramic gasket, the first protrusion is embedded on the first gap, and the arc boss abuts against the annular ceramic gasket, so that the annular ceramic gasket can be more stably installed on the pump shaft support seat.

[0010] According to some embodiments of the utility model, the first side wall is formed by extending the outer side wall of each arc boss, or is formed by extending and connecting the partial outer side walls of the adjacent two arc bosses, so that the first gap and the foreign matter discharging groove can be set as the same opening or different openings according to the requirement.

[0011] According to some embodiments of the utility model, the impeller includes a front end cover plate, a rear end cover plate and an impeller journal, the front end cover plate, the rear end cover plate and the impeller journal are integrally formed, the outer periphery of the support portion is provided with a baffle and / or a rubber ring in the radial direction of the pump shaft, the baffle is located at one end of the inner wall of the impeller journal, and has a rotating gap with the inner wall of the impeller journal, and the outer edge of the rubber ring is in interference fit with the inner wall of the impeller journal, so that the baffle and the rubber ring can effectively prevent foreign matters from entering the blind hole, thereby effectively improving the wear resistance of the graphite bearing.

[0012] According to some embodiments of the present application, the slot of the foreign matter discharging groove has a length and width of 1x1mm or above, which can effectively discharge the graphite powder.

[0013] According to some embodiments of the present application, the rotating gap between the baffle and the inner wall of the impeller shaft neck is 0.3-0.5mm, which can effectively block the rubber and plastic flash and various metal chips generated in the micro shielded electric pump. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the technical scheme of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical scheme of the present application, and do not constitute a limitation on the technical scheme of the present application.

[0015] Figure 1 is a side view of the micro shielded electric pump with the foreign matter retention prevention structure provided by an embodiment of the present application;

[0016] Figure 2 is Figure 1 is an A-A sectional view of the micro shielded electric pump with the foreign matter retention prevention structure;

[0017] Figure 3 is Figure 2 is a partial enlarged view of position A of the micro shielded electric pump with the foreign matter retention prevention structure;

[0018] Figure 4 is Figure 1 is a partial schematic view of the pump cover of the micro shielded electric pump with the foreign matter retention prevention structure;

[0019] Figure 5 is Figure 4 is a partial enlarged view of position B of the pump cover;

[0020] Figure 6 is Figure 4 is a partial schematic view of another embodiment of the pump cover;

[0021] Figure 7 is Figure 1 is a top view of the micro shielded electric pump with the foreign matter retention prevention structure.

[0022] LIST OF DRAWINGS

[0023] The micro shielded electric pump 100;

[0024] Pump cover 200; water outlet pipe 210; water inlet pipe 220; pump shaft support seat 230; support part 231; main body part 232; blind hole 233; foreign matter discharge groove 234; filter hole 235; arc-shaped boss 236; first side wall 237; first notch 238; foreign matter discharge channel 240; annular ceramic gasket 250; first protrusion 251;

[0025] Pump body 300; impeller rotor assembly 310; rotor 311; impeller 312; pump shaft 313; graphite bearing 314; front end cover plate 315; rear end cover plate 316; impeller journal 317; baffle 320; rubber ring 330. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0027] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application. The device or element indicated is necessarily constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0028] In the description of the present application, the plural refers to two or more. If there is a description of first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0029] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0030] The micro shield pump of the present application embodiment is improved on the basis of the traditional products described in CN220457190U and CN113790161A.

[0031] Referring to Figures 1 to 3The miniature shielded electric pump 100 includes a pump cover 200 and a pump body 300. The pump body 300 includes an impeller rotor assembly 310 and a pump shaft 313. The pump cover 200 includes a tubular outlet pipe 210 and an inlet pipe 220. A pump shaft support 230 is provided at the bottom of the inner wall of the inlet pipe 220. The pump shaft support 230 is axially limited to the impeller rotor assembly 310. The pump shaft support 230 is integrally formed with the pump cover 200. The pump shaft support 230 includes a support portion 231 and a main body portion 232. The main body portion 232 is supported at one end by the support portion 231, and the other end of the support portion 231 is connected to the bottom end of the inner wall of the water inlet pipe 220. The lower end of the main body portion 232 is provided with an axial blind hole 233. The upper end of the pump shaft 313 is inserted into the blind hole 233 and connected to it. The blind hole 233 is provided with a groove 234 (referred to as a foreign matter discharge groove) and / or a filter hole 235 that passes through it for discharging foreign matter. Specifically, the pump shaft support 230 and the impeller rotor assembly 310 are axially limited by the following: there is a gap between the annular ceramic gasket 250 installed at the port of the blind hole 233 and the upper end face of the graphite bearing 314 installed on the rotor assembly 310, thereby forming an axial limit between the pump shaft support 230 and the impeller rotor assembly 310.

[0032] When the impeller rotor assembly 310 operates at high speed, it is subjected to a reverse axial force. Since the pump shaft support 230 and the impeller rotor assembly 310 are axially limited, wear occurs at the contact surfaces, leading to the precipitation of impurities. By creating a discharge groove 234 on the sidewall of the blind hole 233 connected to the pump shaft 313, impurities can be discharged promptly, preventing accumulation within the blind hole 233 or its full accumulation affecting the rotation of the rotor 311, thereby improving the rotational efficiency and wear resistance of the rotor 311. In this embodiment, the discharge groove 234 is arranged radially. In fact, as long as it penetrates the inside and outside of the sidewall of the blind hole 233, it forms an overall radial flow structure. The centrifugal force generated by the rotational motion of the rotor assembly facilitates the discharge of the retained material, but a radially arranged flow path is the shortest and most effective.

[0033] It is understood that the foreign matter discharge groove 234 can be arranged radially along the sidewall of the blind hole 233, or it can be arranged inclined to the sidewall of the blind hole 233 in the rotational direction and / or axial direction to penetrate the inside and outside of the blind hole 233. The foreign matter discharge groove 234 of this application is preferably arranged radially along the sidewall of the blind hole 233.

[0034] Specifically, the impeller rotor assembly 310 includes a rotor 311, an impeller 312, and a graphite bearing 314, which are sequentially arranged around the outer periphery of the pump shaft 313. An annular ceramic gasket 250 is installed at the open end of the blind hole 233, and a gap is left between the inner wall of the annular ceramic gasket 250 and the outer periphery of the pump shaft 313.

[0035] When the impeller rotor assembly 310 is subjected to a reverse axial force at high speed, the end surface of the graphite bearing 314 of the impeller rotor assembly 310 and the end surface of the annular ceramic gasket 250 are abraded, thereby causing graphite powder to be precipitated, which is discharged from the foreign matter discharge groove 234.

[0036] In addition, the impeller includes a front end cover plate 315, a rear end cover plate 316 and an impeller journal 317, which are integrally formed, and the inner wall of the impeller journal 317 forms the foreign matter discharge channel 240 with the outer periphery of the pump shaft support seat 230, and the impurities discharged from the foreign matter discharge groove 234 enter the foreign matter discharge channel 240.

[0037] Reference Figures 4 to 7 The bottom of the blind hole 233 is provided with a through hole (referred to as a filter hole) 235 leading to the foreign matter discharge channel 240, which can play a filtering role. The filter hole 235 communicates the blind hole 233 and the foreign matter discharge channel 240. Since the rotor 311 is subjected to a reverse axial force at high speed, the graphite bearing 314 and the pump shaft support seat 230 are abraded, graphite powder or other impurities enter the blind hole 233, and the filter hole 235 is arranged at the bottom of the blind hole 233. Therefore, the graphite powder or other impurities can be discharged from the filter hole 235 under the reverse axial force, and then enter the foreign matter discharge channel 240, preventing the graphite powder from being accumulated in the blind hole 233, further improving the smoothness and efficiency of the rotation of the rotor 311, and avoiding the occurrence of a locked-rotor failure.

[0038] Specifically, the filter hole 235 at the bottom of the blind hole 233 has a hole diameter of 0.3-0.5mm, so that impurities smaller than 0.3 to 0.5mm can be discharged to the foreign matter discharge channel 240 through the filter hole 235.

[0039] It can be understood that the number of filter holes 235 can be set as needed, and in the present application, the number of filter holes 235 is preferably 3.

[0040] It should be noted that the foreign matter discharge groove and the filter hole can be arranged in the blind hole alone or simultaneously. When the foreign matter discharge groove and the filter hole are arranged simultaneously, the effect of discharging foreign matter is better.

[0041] Reference Figure 2 and Figure 6 The end surface of the blind hole 233 is provided with a plurality of arc-shaped bosses 236 in the circumferential direction, and the adjacent two arc-shaped bosses 236 form the foreign matter discharge groove 234, which is equivalent to grooving the hole wall of the blind hole 233 to communicate the blind hole 233 and the foreign matter discharge channel 240, thereby forming the foreign matter discharge groove 234. Therefore, the graphite powder and other impurities in the blind hole 233 can be discharged from the foreign matter discharge groove 234.

[0042] Specifically, the slot area of the foreign matter groove 234 can be set according to actual conditions. The length and width of the slot of the foreign matter groove 234 of the present application are greater than or equal to 1x1 mm. In addition, the number of foreign matter grooves 234 can be set as needed. Since the foreign matter grooves 234 are formed by the arc-shaped bosses 236, the number of arc-shaped bosses 236 is also set correspondingly. For example, the number of foreign matter grooves 234 of the present application is preferably 3, and the number of arc-shaped bosses 236 is also set to 3 correspondingly.

[0043] With reference to Figures 2 to 7 The outer wall of the arc-shaped boss 236 extends to form a first side wall 237. Between two adjacent first side walls 237, a first gap 238 is formed. A first protrusion 251 is formed on the outer peripheral wall of the annular ceramic gasket 250 and corresponds to the first gap 238. The first protrusion 251 is embedded in the first gap 238, and the arc-shaped boss 236 abuts against the annular ceramic gasket 250. The annular ceramic gasket 250 is embedded in the first gap 238 through the first protrusion 251, so that the annular ceramic gasket 250 is stably installed on the pump shaft support seat 230, and the axial size of the micro shielded electric pump 100 is more compact.

[0044] With reference to Figure 6 The first side wall 237 is formed by the outer side wall of each arc-shaped boss 236 or is formed by the partial outer walls of two adjacent arc-shaped bosses 236, so that the first gap 238 and the foreign matter groove 234 can be set as the same opening or different openings as needed.

[0045] It can be understood that the number of first gaps 238 can be set as needed, and the number of first protrusions 251 on the corresponding annular ceramic gasket 250 is also set as needed. For example, the number of first gaps 238 of the present application is preferably 3, and the number of first protrusions 251 is also set to 3 correspondingly.

[0046] With reference to Figures 2 to 7 The outer periphery of the support portion 231 is provided with a baffle plate 320 and / or a rubber ring 330 along the radial direction of the pump shaft. The baffle plate 320 is located at one end of the inner wall of the impeller journal 317 and has a gap with the inner wall of the impeller journal 317. The outer edge of the rubber ring 330 is in interference fit with the inner wall of the impeller journal 317.

[0047] Specifically, the edge of the baffle 320 and the inner wall of the impeller shaft neck 317 are left with a rotation gap of 0.3-0.5mm. Due to the running wear and process cleanliness limitation, after the automobile runs for a period of time, the entire micro shielded electric pump 100 is prone to produce plastic flash and various metal chips, the size of these impurities generally exceeds 0.5mm, and is filled in the solution of the entire micro shielded electric pump 100, thereby circulating repeatedly. The edge of the baffle 320 and the inner wall of the impeller shaft neck 317 are left with a rotation gap of only 0.3-0.5mm, and these impurities larger than 0.5mm can be blocked from entering the end face of the graphite bearing 314, thereby effectively reducing the abnormal wear of the graphite bearing 314, improving the wear resistance of the graphite bearing 314, and improving the running noise of the micro shielded electric pump 100.

[0048] On the other hand, specifically, the rubber ring 330 is sleeved on the outer periphery of the support portion 231, and the outer edge of the rubber ring 330 is interference fit with the inner wall of the impeller shaft neck 317. Therefore, the setting of the rubber ring 330 can completely block the impurities from entering the blind hole 233, thereby further improving the wear resistance of the graphite bearing 314 and prolonging the service life of the graphite bearing 314.

[0049] It can be understood that the baffle 320 and the rubber ring 330 can be selected and set, and both can be set. When the baffle 320 is set alone, it may not be able to block impurities smaller than 0.5mm, but it will not hinder the rotation of the rotor 311. When the rubber ring 330 is set alone, the impeller shaft neck 317 of the rotor 311 and the outer edge of the rubber ring 330 will produce friction, but can completely block impurities. When both are set, the impurities entering the impurity discharge channel 240 can be reduced to the maximum extent. Therefore, the baffle 320 and the rubber ring 330 can be set according to actual needs, and are not specifically limited herein.

[0050] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above embodiments, and various changes can be made within the knowledge range possessed by those skilled in the art without departing from the purpose of the utility model.

Claims

1. A microshielded electro-pump (100) comprising a foreign object debris resistant structure, comprising: Pump cover (200) and pump body (300), the pump body (300) includes impeller rotor assembly (310) and pump shaft (313);The pump cover (200) includes tubular outlet pipe (210) and inlet pipe (220), the inner wall bottom of the inlet pipe (220) is provided with pump shaft support seat (230), the pump shaft support seat (230) is axially limited to the impeller rotor assembly (310), the pump shaft support seat (230) is integrally formed with the pump cover (200), the main part (232) of the pump shaft support seat (230) is supported by its support part (231), the lower end of the main part (232) is provided with axial blind hole (233), the upper end of the pump shaft (313) is inserted into the blind hole (233);Its characterized in that: the side wall of the blind hole (233) is provided with the foreign matter discharge groove (234) through the inside and outside of the side wall of the blind hole (233) and / or the bottom of the blind hole (233) is provided with filter hole (235), and the filter hole (235) is communicated between the inside and outside of the bottom of the blind hole (233).

2. The microshielded electro-pump (100) with anti-foreign matter retention structure according to claim 1, characterized in that, The port of the blind hole (233) is provided with a plurality of arc-shaped bosses (236) along the circumference of the axis, and the adjacent two arc-shaped bosses (236) are penetrated by the foreign matter discharge groove (234).

3. The microshielded electro-pump (100) with anti-foreign matter retention structure according to claim 2, characterized in that, The impeller rotor assembly (310) includes rotor (311), impeller (312) and graphite bearing (314), the graphite bearing (314), impeller (312) and rotor (311) are sequentially arranged on the outer periphery of the pump shaft (313), the port of the blind hole (233) is provided with annular ceramic gasket (250), and the inner wall of the annular ceramic gasket (250) and the outer periphery of the pump shaft (313) have a gap.

4. The micro-shielded electro-pump (100) containing anti-foreign matter retention structure according to claim 3, characterized in that, The outer wall of the arc-shaped boss (236) further extends into a first side wall (237) along the axial direction, a first gap (238) is formed between the adjacent two first side walls (237), a first protrusion (251) corresponding to the first gap (238) is formed on the outer peripheral wall of the annular ceramic gasket (250), the first protrusion (251) is embedded on the first gap (238), and the arc-shaped boss (236) abuts against the annular ceramic gasket (250).

5. The anti-trap micro-shielded electro-pump (100) according to claim 4, characterized in that, The first side wall (237) is formed by extending the outer side wall of each arc-shaped boss (236), or is formed by extending and connecting the partial outer side walls of the adjacent two arc-shaped bosses (236).

6. The microshielded electro-pump (100) comprising a foreign object debris resistant structure according to any one of claims 3 to 5, characterized in that, The impeller includes front end cover plate (315), rear end cover plate (316) and impeller journal (317), the front end cover plate (315), rear end cover plate (316) and impeller journal (317) are integrally formed, the outer periphery of the support part (231) is provided with baffle (320) and / or rubber ring (330) along the radial direction of the pump shaft, the baffle (320) is located at one end of the inner wall of the impeller journal (317), and there is a rotation gap between the baffle (320) and the inner wall of the impeller journal (317);The outer edge of the rubber ring (330) is in interference fit with the inner wall of the impeller journal (317).

7. The anti-trap micro-shielded electro-pump (100) according to claim 1, characterized in that, The length and width of the slot of the foreign matter removing groove (234) are 1x1mm or more.

8. The anti-trap micro-shielded electro-pump (100) according to claim 6, characterized in that, The rotating gap between the baffle (320) and the inner wall of the impeller shaft neck (317) is 0.3-0.5mm.

Images