A pump

Abstract

The utility model relates to a pump, including shaft and bearing, bearing cover is located in the shaft outside, the pump still includes: limiting piece, limiting piece is equipped with mounting hole, limiting piece cover is located in the end of shaft and is with the clearance cooperation of shaft, limiting piece is located bearing one side, and limiting piece is first plane close to the one end of bearing, and limiting piece is integral structure, volute, including stop portion, stop portion is equipped with stop hole, limiting piece part is located in stop hole, and can with the inner wall contact of stop hole, the side of limiting piece in stop hole is the part of spherical surface, and the position that the inner wall of stop hole contacted with limiting piece is the part of spherical surface. When water pump works, the end surface of bearing is pressed to limiting piece when bearing bears axial force, limiting piece will utilize the spherical surface of limiting piece and the spherical surface of stop hole and carry out automatic alignment and deviation correction under the action of force, and then realize the end surface of bearing and the first plane of limiting piece complete contact. Limiting piece is integral structure, and the processing cost is low, and the installation is convenient.

Description

Technical Field

[0001] This utility model relates to the field of pump structure technology, and in particular to a pump. Background Technology

[0002] A pump, such as a centrifugal pump, is a device used to drive the flow of liquids. A centrifugal pump includes an impeller, whose rotation drives the flow of water. However, the impeller experiences a forward axial force as it rotates, generated by the pressure difference between the front and rear sides of the impeller. This axial force is transmitted through the impeller to the bearing between the impeller and the shaft. The bearing end face contacts a gasket, thus transferring the axial force to the gasket. The gasket contacts a volute, which in turn limits the movement of the gasket.

[0003] When the pump is working, the bearing rotates at high speed along with the impeller and rubs against the gasket, forming a rotating sliding friction pair. Prolonged contact between the bearing and the limiting components will cause wear. To ensure sufficient service life, the amount of wear needs to be controlled.

[0004] However, due to manufacturing processes, machining precision, and installation precision, the bearing end face and the gasket may not be parallel, and there may be partial contact between them. The bearing end face and the plane of the limiting component form a small angle, the contact area between them is small, and the bearing end face bears a relatively large pressure.

[0005] Existing technologies also include methods to increase the contact area between the bearing end face and the gasket through structural improvements, but these methods are complex, involve many parts, and have high production and installation costs. Utility Model Content

[0006] The purpose of this invention is to provide a pump that solves at least one of the aforementioned problems.

[0007] To achieve the above objectives, the first aspect of this utility model provides a pump, including a shaft and a bearing, wherein the bearing is sleeved outside the shaft, and the pump further includes: A limiting member is provided, wherein the limiting member is provided with a mounting hole, the limiting member is sleeved on the end of the shaft and has a clearance fit with the shaft, the limiting member is located on one side of the bearing, the end of the limiting member near the bearing is a first plane, and the limiting member is an integral structure; The volute includes a stop portion with a stop hole. A limiting member is located inside the stop hole and can contact the inner wall of the stop hole. The side of the limiting member inside the stop hole is part of a spherical surface, and the position where the inner wall of the stop hole contacts the limiting member is part of a spherical surface.

[0008] Optionally, the limiting member includes a first part and a second part connected together, the side of the second part being a part of a sphere, and the diameter of the first part being larger than the maximum diameter of the second part.

[0009] Optionally, the end of the second part away from the first part is a second plane.

[0010] Optionally, the stop is made of plastic; and / or The limiting member is made of ceramic or metal; or, the limiting member is made of metal, and the surface of the metal is provided with a wear-resistant coating.

[0011] Optionally, the volute further includes a volute body and a connecting rib. The volute body has a liquid inlet, one end of the connecting rib is connected to the inner wall of the liquid inlet, and the other end is connected to the stop portion.

[0012] Optionally, the number of connecting ribs is multiple, and the multiple connecting ribs are evenly spaced along the circumferential direction of the liquid inlet.

[0013] Optionally, the volute is integrally formed.

[0014] Optionally, the cross-section of the end of the shaft is non-circular, and the shape of the cross-section of the mounting hole is the same as the shape of the cross-section of the end of the shaft.

[0015] Optionally, the cross-section of the end of the shaft and the cross-section of the mounting hole are both D-shaped.

[0016] Optionally, the single-sided gap between the shaft and the limiting member is 0.1mm-0.2mm.

[0017] The beneficial effects of this utility model are as follows: When the first plane is not parallel to the bearing end face, a wedge-shaped angle exists between them. When the water pump operates and the bearing is subjected to axial force, the bearing end face presses against the limiting component. Under this force, the limiting component automatically guides and corrects itself using the spherical surfaces of its own surface and the stop hole, thus achieving complete contact between the bearing end face and the first plane of the limiting component. The limiting component is an integral structure, resulting in low processing costs and easy installation. Attached Figure Description

[0018] Figure 1 This is an exploded view of the pump provided in this embodiment of the present invention. Figure 2 This is a cross-sectional view of the pump provided in an embodiment of this utility model; Figure 3 yes Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a schematic diagram of the structure of the limiting member provided in this embodiment of the utility model; Figure 5 This is a plan view of the limiting member provided in this embodiment of the utility model; Figure 6 This is a cross-sectional view of the pump provided in an embodiment of the present invention from another perspective; Figure 7 This is a schematic diagram of the volute structure provided in an embodiment of the present invention.

[0019] In the picture: 1. Shaft; 2. Bearing; 3. Limiting component; 31. Second part; 311. Side; 312. Second plane; 32. First part; 321. First plane; 33. Mounting hole; 4. Volute housing; 41. Stop section; 411. Stop hole; 42. Volute housing body; 423. Liquid inlet; 424. Liquid outlet; 43. Connecting rib; 5. Frame; 6. Stator assembly; 7. Impeller; 71. Impeller body; 72. Mover assembly. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0021] This utility model defines certain directional terms. Unless otherwise stated, the directional terms used, such as "up", "down", "left", "right", "inner", and "outer", are used for ease of understanding and therefore do not constitute a limitation on the scope of protection of this utility model.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] This embodiment provides a pump, such as a water pump, but not limited to it; it could also be an oil pump, etc.

[0025] like Figures 1-3 As shown, the pump provided in this embodiment includes a limiting member 3, a volute 4, a shaft 1, and a bearing 2, with the bearing 2 sleeved on the outside of the shaft 1. The limiting member 3 has a mounting hole 33, and is sleeved on the end of the shaft 1 with a clearance fit. The limiting member 3 is located on one side of the bearing 2, and the end of the limiting member 3 near the bearing 2 is a first plane 321. The limiting member 3 is an integral structure.

[0026] The volute 4 includes a stop portion 41 with a stop hole 411. A limiting member 3 is partially located within the stop hole 411 and can contact the inner wall of the stop hole 411. The side surface 311 of the limiting member 3 within the stop hole 411 is part of a spherical surface, and the position where the inner wall of the stop hole 411 contacts the limiting member 3 is also part of the spherical surface. Preferably, the diameter of the spherical surface on the limiting member 3 is the same as the diameter of the spherical surface on the stop hole 411, with a tolerance of ±0.1 mm.

[0027] When the first plane 321 is not parallel to the end face of the bearing 2, a wedge-shaped angle exists between the first plane 321 and the end face of the bearing 2. When the water pump is working and the bearing 2 is subjected to axial force, the end face of the bearing 2 presses against the limiting member 3. At this time, the limiting member 3 will automatically guide and correct itself under the action of force using the spherical surface of the limiting member 3 and the spherical surface of the stop hole 411, thereby achieving complete contact between the end face of the bearing 2 and the first plane 321 of the limiting member 3. The limiting member 3 is an integral structure, and the entire friction pair area consists of only four parts: shaft 1, bearing 2, limiting member 3, and stop part 41, which has low processing cost and is easy to install.

[0028] In addition, the spherical surface of the limiting member 3 adopts an outward protrusion design, which avoids the problem of low strength of the limiting member 3 caused by using an inward concave spherical surface. It also allows the limiting member 3 to be made smaller, so that the overall volume of the pump is also smaller.

[0029] like Figure 3 and Figure 4As shown, the limiting member 3 includes a first part 32 and a second part 31 connected together. The side surface 311 of the second part 31 is part of a sphere. The diameter of the first part 32 is larger than the maximum diameter of the second part 31. The first plane 321 is the end face of the first part 32 away from the second part 31. The diameter of the first part 32 is larger than the maximum diameter of the second part 31. This results in a larger area of ​​the first plane 321, which ensures a larger contact area between the end face of the bearing 2 and the first plane 321. The diameter of the second part 31 is smaller, which reduces the obstruction of the inlet 423 (described in detail later) by the second part 31 and the stop part 41, ensuring smooth liquid intake and reducing the overall volume of the pump, making the pump structure more compact.

[0030] It is understandable that when we say that the side surface 311 of the second part 31 is part of a sphere, it means that the side surface 311 of the second part 31 is not a complete sphere. Alternatively, it can be considered that the side surface 311 of the second part 31 is a spherical cap or a part of a spherical cap, which is the curved surface remaining after the sphere is cut off by a plane. It can also be considered that the second part 31 is a spherical notch, that is, the second part 31 is the remaining part after the sphere is cut off by a plane, and the plane formed after the second part 31 is cut off connects to the first part 32.

[0031] Preferably, the end of the second part 31 furthest from the first part 32 is a second plane 312. This avoids the second part 31 from forming a fragile, easily damaged sharp corner at the end furthest from the first part 32. It can be understood that, in this case, the second part 31 is the portion remaining after a sphere has been cut off by two parallel planes.

[0032] It is understood that both the first part 32 and the second part 31 have through holes to form the aforementioned mounting hole 33. In this embodiment, for the convenience of describing the structure of the limiting member 3, the limiting member 3 is divided into the first part 32 and the second part 31. In reality, the limiting member 3 is an integral structure, and there is no obvious interface at the connection between the first part 32 and the second part 31. The mounting hole 33 is a single hole, rather than two holes connected together.

[0033] In this embodiment, neither the limiting member 3 nor the shaft 1 rotates, the bearing 2 rotates relative to the shaft 1, and the impeller 7 is fixedly sleeved on the outside of the bearing 2. In some embodiments, the cross-section of the end of the shaft 1 is non-circular, and the shape of the cross-section of the mounting hole 33 is the same as the shape of the cross-section of the end of the shaft 1, so that after the end of the shaft 1 is inserted into the mounting hole 33, the shaft 1 and the limiting member 3 are prevented from rotating relative to each other.

[0034] like Figure 5 and Figure 6As shown, exemplarily, the cross-section of the end of the shaft 1 and the cross-section of the mounting hole 33 are both D-shaped. Of course, in other optional embodiments, the cross-section of the end of the shaft 1 can also be polygonal, such as rectangular, pentagonal, or hexagonal. However, in this embodiment, the cross-section of the end of the shaft 1 and the cross-section of the mounting hole 33 are preferably D-shaped to facilitate automatic guidance and correction of the limiting member 3.

[0035] In some optional embodiments, the single-sided gap between the shaft 1 and the limiting member 3 is 0.1mm-0.2mm, thereby allowing the limiting member 3 to have space for positioning using a spherical fit. The limiting member 3 rotates at a small angle relative to the shaft 1, so that the limiting member 3 can automatically guide and correct itself under the action of axial force.

[0036] Continue as Figure 1 and Figure 2 As shown, in some embodiments, the pump may further include a base 5 and a stator assembly 6, the stator assembly 6 being disposed within the base 5, one end of the volute 4 being connected to the base 5 by screws or other connection methods, and the impeller 7 being disposed within the space enclosed by the volute 4 and the base 5.

[0037] like Figure 2 The impeller 7 includes an impeller body 71 and a mover component 72, which can be integrally injection molded. The mover component 72 includes a housing and a magnet and an iron core disposed within the housing. Specifically, during the injection molding of the impeller 7, the magnet and iron core can be placed in a preset position in the mold, and then the impeller 7 is formed through the injection molding process, wherein the material used in the injection molding process is plastic. Optionally, during the injection molding of the impeller 7, a bearing 2 can also be placed in a preset position in the mold, thereby connecting the bearing 2, the impeller body, and the mover component. The bearing 2 can be a thrust bearing 2, and there is a clearance fit between the bearing 2 and the shaft 1, thereby allowing relative rotation between the bearing 2 and the shaft 1.

[0038] like Figure 6 , Figure 7 and combined Figure 1 and Figure 2 The volute 4 includes an inlet 423 and an outlet 424. When the impeller 7 rotates, liquid is drawn into the volute 4 through the inlet 423 and discharged from the volute 4 through the outlet 424. In some embodiments, the central axes of the impeller 7, the shaft 1, and the inlet 423 coincide.

[0039] like Figure 7 and combined Figure 6The volute 4 may further include a volute body 42 and a connecting rib 43. An inlet 423 and / or an outlet 424 are formed on the volute body 42. One end of the connecting rib 43 is connected to the inner wall of the inlet 423, and the other end is connected to the stop portion 41. The stop hole 411 of the stop portion 41 is a blind hole, with its opening facing the shaft 1. The connecting rib 43 can both fix the stop portion 41 and ensure that liquid flows into the volute 4 through the inlet 423 without obstructing the flow of liquid.

[0040] In some embodiments, there are multiple connecting ribs 43, which are evenly spaced along the circumferential interval of the liquid inlet 423, thereby improving the stability of the stop portion 41 connection.

[0041] For example, the stop 41 is made of plastic, thereby reducing noise generated by the contact between the stop 41 and the limiting member 3. In some embodiments, the volute 4 is integrally molded. More preferably, the volute 4 is made of plastic and can be integrally molded by injection molding.

[0042] For example, the limiting member 3 is made of ceramic or metal material, such as stainless steel, thereby improving the wear resistance of the limiting member 3. Alternatively, the limiting member 3 is made of metal material, and the surface of the metal material is provided with a wear-resistant coating. The wear-resistant coating can be a ceramic coating or a DLC coating. The ceramic coating can be a carbide ceramic coating such as tungsten carbide or silicon carbide, or an oxide ceramic coating such as alumina. Making the limiting member 3 with the above materials can ensure the wear resistance between the bearing and the limiting member 3.

[0043] Although the present invention has been described in detail above with general descriptions, specific embodiments, and experiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A pump comprising a shaft (1) and a bearing (2), said bearing (2) being sleeved outside the shaft (1), characterized in that, The pump also includes: The limiting member (3) has a mounting hole (33), the limiting member (3) is sleeved on the end of the shaft (1) and has clearance fit with the shaft (1), the limiting member (3) is located on one side of the bearing (2), the end of the limiting member (3) near the bearing (2) is a first plane (321), and the limiting member (3) is an integral structure; The volute (4) includes a stop portion (41), the stop portion (41) having a stop hole (411), the limiting member (3) being located inside the stop hole (411) and able to contact the inner wall of the stop hole (411), the side surface (311) of the limiting member (3) inside the stop hole (411) being part of a spherical surface, and the position where the inner wall of the stop hole (411) contacts the limiting member (3) being part of a spherical surface.

2. The pump according to claim 1, characterized in that, The limiting member (3) includes a first part (32) and a second part (31) connected together. The side (311) of the second part (31) is part of a sphere. The diameter of the first part (32) is greater than the maximum diameter of the second part (31).

3. The pump according to claim 2, characterized in that, The end of the second part (31) away from the first part (32) is the second plane (312).

4. The pump according to claim 1, characterized in that, The stop (41) is made of plastic; and / or The limiting member (3) is made of ceramic or metal material; or, the limiting member (3) is made of metal material and the surface of the metal material is provided with a wear-resistant coating.

5. The pump according to claim 1, characterized in that, The volute (4) also includes a volute body (42) and a connecting rib (43). The volute body (42) has a liquid inlet (423). One end of the connecting rib (43) is connected to the inner wall of the liquid inlet (423), and the other end is connected to the stop part (41).

6. The pump according to claim 5, characterized in that, The number of connecting ribs (43) is multiple, and the multiple connecting ribs (43) are evenly spaced along the circumferential interval of the liquid inlet (423).

7. The pump according to claim 5 or 6, characterized in that, The volute (4) is integrally formed.

8. The pump according to claim 1, characterized in that, The cross-section of the end of the shaft (1) is non-circular, and the shape of the cross-section of the mounting hole (33) is the same as the shape of the cross-section of the end of the shaft (1).

9. The pump according to claim 8, characterized in that, The cross-section of the end of the shaft (1) and the cross-section of the mounting hole (33) are both D-shaped.

10. The pump according to claim 1, characterized in that, The single-sided gap between the shaft (1) and the limiting member (3) is 0.1mm-0.2mm.

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