A DC brushless water pump

Abstract

This invention provides a DC brushless water pump, belonging to the field of water pump technology. It solves the problem of low impeller flow guiding efficiency in existing water pumps. The outer pump casing of this invention is cylindrical and covers the outside of the pump frame assembly and stator assembly. The pump cover is installed on both sides of the outer end of the pump frame assembly. The side pump frames are installed on both sides of the pump barrel, and the inner pump frame is installed inside the pump barrel. A cross is formed inside the side and inner pump frames, and a shaft hole is opened in the center of the cross. The impeller body is located between the side and inner pump frames, and between the inner and outer pump frames. Curved blades are formed inside the impeller body, and flow guiding channels are formed between the curved blades. A flow guiding hole is opened on the front end face of the impeller body, and the flow guiding hole is connected to the flow guiding channel. A hub protrusion extends rearward inside the impeller body. Several mounting grooves are opened on the outer periphery of the impeller body, and permanent magnets are fixedly installed in the mounting grooves. This invention has the advantages of good flow guiding effect, stable power transmission, and stable overall structure.

Description

Technical Field

[0001] This utility model belongs to the field of water pump technology and relates to a DC brushless water pump. Background Technology

[0002] A DC brushless water pump is a water pump that uses a DC brushless motor as its power source. The motor uses electronic commutation instead of traditional mechanical commutation, avoiding brush wear problems, greatly extending its service life, and also reducing noise during operation.

[0003] Chinese patent publication number CN206830493U discloses a brushless DC drainage pump, including a pump body, an end cover, and a fan impeller. The pump body has an outer cavity, a protrusion inside the outer cavity, and an inner cavity inside the protrusion. A stator assembly is located in the outer cavity and sleeved on the protrusion. A rotor assembly is located in the inner cavity and can rotate within it. The end cover is connected to one end of the pump body opposite to the rotor assembly. The end cover has a liquid-containing cavity, and an inlet and an outlet communicating with the liquid-containing cavity, respectively. The fan impeller is connected to the rotor assembly and located in the liquid-containing cavity. A positioning structure is provided in the outer cavity of the pump body. The stator assembly has a recess that cooperates with the positioning structure. The stator assembly is fixed and confined within the pump body by the cooperation of the recess and the positioning structure. The fan impeller includes a connecting part that connects to a magnet, and the side wall of the connecting part has several spaced fan blades.

[0004] The brushless DC drainage pump provided by this patent has a conventionally designed impeller. When transporting liquid, it may not be able to effectively reduce the eddy currents and resistance of the liquid, resulting in a large energy loss during pump operation and thus reducing the overall hydraulic efficiency. This makes it unsuitable for some scenarios that require high-efficiency transport. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a DC brushless water pump.

[0006] The objective of this utility model can be achieved through the following technical solution: A DC brushless water pump includes an outer pump housing, a fixing pin, a pump cover, a pump frame assembly, a pump shaft, impeller bodies, and a stator assembly. The outer pump housing is cylindrical and covers the outside of the pump frame assembly and the stator assembly. The pump cover is installed on both sides of the outer end of the pump frame assembly. The pump frame assembly includes a pump cylinder, a side pump frame, and an inner pump frame. The side pump frames are installed on both sides of the pump cylinder, and the inner pump frame is installed inside the pump cylinder. A cross is formed inside the side pump frame and the inner pump frame, and a shaft hole is opened in the center of the cross. The number of impeller bodies is several. It is located between the side pump frame and the inner pump frame, as well as between the inner pump frame and the inner pump frame. The impeller body is a one-piece molded structure and the impeller body is generally disc-shaped. Curved blades are formed inside the impeller body, and flow guiding channels are formed between the curved blades. A flow guiding hole is opened on the front end face of the impeller body and the flow guiding hole is connected to the flow guiding channel. A hub protrusion is formed extending rearward inside the impeller body. Several mounting grooves are opened on the outer periphery of the impeller body. Permanent magnets are fixedly installed in the mounting grooves. The pump shaft passes through the shaft hole and the hub protrusion. The stator assembly is installed outside the pump frame assembly.

[0007] In the aforementioned DC brushless water pump, a connecting cylinder is formed on the outer side of the cross-shaped part of the side pump frame, and the interior of the connecting cylinder is connected to both ends of the pump shaft.

[0008] In the aforementioned DC brushless water pump, the two ends of the outer pump housing extend inward to form connecting rings.

[0009] In the aforementioned DC brushless water pump, a plurality of first connecting protrusions are formed on the outer periphery of the pump cover, and a plurality of second connecting protrusions are formed on the outer periphery of the side pump frame. The first connecting protrusions and the second connecting protrusions are identical and fitted and correspondingly arranged. A third connecting protrusion is formed on the outer surface of the pump barrel. The fixing pin passes through the connecting ring, the first connecting protrusions, the second connecting protrusions and the third connecting protrusions, and fastening nuts are fixed on both sides of the fixing pin.

[0010] In the aforementioned DC brushless water pump, a gasket groove is provided in the pump cover on the front side of the first connecting protrusion, and a shock-absorbing washer is fitted on the fixing pin and the shock-absorbing washer fits into the gasket groove.

[0011] In the aforementioned DC brushless water pump, the outer side of the first connecting protrusion is fitted to the inner side of the connecting ring.

[0012] Compared with the prior art, the DC brushless water pump provided by this utility model has the following beneficial effects: 1. The flow channel formed between the curved blades, combined with the flow guide hole on the front end face of the impeller body directly connected to the flow channel, can guide the fluid to enter the channel quickly and smoothly, reducing fluid stagnation and eddies at the inlet; 2. The permanent magnet is positioned and installed on the outer periphery of the impeller body through the mounting groove, which can ensure that the air gap between the permanent magnet and the outer stator assembly is uniform, making the electromagnetic force between the stator assembly and the permanent magnet more stable, improving the smoothness of the pump output power and reducing noise; 3. The connecting rings at both ends of the outer pump housing, the first connecting protrusion of the pump cover, and the second connecting protrusion of the side pump frame fit together, which can accurately ensure the concentricity of the outer pump housing, pump cover, and pump frame assembly, and improve the overall stability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the exploded structure of this utility model; Figure 3 This is a schematic diagram of the exploded structure of the pump frame assembly; Figure 4 This is a schematic diagram of the impeller body structure; Figure 5 This is a schematic diagram of the impeller body from another angle.

[0014] In the diagram: 1. Outer pump housing; 11. Connecting ring; 2. Fixing pin; 3. Pump cover; 31. First connecting protrusion; 32. Washer groove; 4. Pump frame assembly; 41. Pump barrel; 411. Third connecting protrusion; 42. Side pump frame; 421. Second connecting protrusion; 43. Inner pump frame; 44. Cross; 45. Shaft hole; 46. Connecting cylinder; 5. Pump shaft; 6. Impeller body; 61. Curved blade; 62. Guide channel; 63. Guide hole; 64. Hub protrusion; 65. Mounting groove; 7. Stator assembly; 8. Permanent magnet; 9. Fastening nut; 10. Vibration damping washer. Detailed Implementation

[0015] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0016] like Figures 1 to 5 As shown, this embodiment includes an outer pump housing 1, a fixing pin 2, a pump cover 3, a pump frame assembly 4, a pump shaft 5, an impeller body 6, and a stator assembly 7. The outer pump housing 1 has a cylindrical structure and is completely covered on the outside of the pump frame assembly 4 and the stator assembly 7, forming protection and support for the internal core components. The two ends of the outer pump housing 1 extend inward to form connecting rings 11. The connecting rings 11 are distributed circumferentially along the ends of the outer pump housing 1, providing a positioning and connection basis for the overall assembly. The pump cover 3 is installed on both sides of the outer end of the pump frame assembly 4.

[0017] like Figure 3 As shown, the pump frame assembly 4 includes a pump cylinder 41, a side pump frame 42, and an inner pump frame 43. The side pump frames 42 are symmetrically installed on both sides of the pump cylinder 41, and there are two inner pump frames 43 installed inside the pump cylinder 41. Together, they form the internal support frame of this embodiment. A cross 44 is formed inside both the side pump frame 42 and the inner pump frame 43. A shaft hole 45 is opened in the middle of the cross 44. The shaft hole 45 provides a precise positioning channel for the installation of the pump shaft 5. A connecting cylinder 46 is also integrally formed on the outside of the cross 44 of the side pump frame 42. The interior of the connecting cylinder 46 is connected to both ends of the pump shaft 5, which further improves the stability of the pump shaft 5 installation.

[0018] like Figures 2 to 5 As shown, there are three impeller bodies 6, which are respectively arranged between the side pump frame 42 and the inner pump frame 43, and between two adjacent inner pump frames 43. The multi-stage impeller structure improves the head and flow rate of this embodiment. The impeller body 6 is made by a one-piece molding process and is generally disc-shaped. Curved blades 61 are formed inside the impeller body 6. The curved blades 61 are evenly distributed around the center of the impeller body 6, and the blades naturally form a flow guide channel 62. The front end face of the impeller body 6 has a flow guide hole 63, which is directly connected to the flow guide channel 62, so as to guide the fluid smoothly into the channel. The interior of the impeller body 6 extends rearward to form a hub protrusion 64, which is connected to the pump shaft 5 to ensure that the impeller body 6 rotates synchronously with the pump shaft 5. Several mounting slots 65 are also provided on the outer periphery of the impeller body 6. Permanent magnets 8 are fixedly installed in the mounting slots 65. The pump shaft 5 passes through the shaft hole 45 on the cross 44 and the hub protrusion 64 of the impeller body 6, connecting multiple impeller bodies 6 in series and achieving synchronous rotation. The stator assembly 7 is installed on the outside of the pump frame assembly 4 and forms an electromagnetic drive structure with the permanent magnets 8 on the outer periphery of the impeller body 6 to provide power for the rotation of the impeller body 6.

[0019] To elaborate further, such as Figure 2 and Figure 3 As shown, the outer periphery of the pump cover 3 has several first connecting protrusions 31, the outer periphery of the side pump frame 42 has several second connecting protrusions 421, and the outer surface of the pump barrel 41 has several third connecting protrusions 411. The first connecting protrusions 31, second connecting protrusions 421 and third connecting protrusions 411 have the same structure and are correspondingly arranged in a circumferential fit. The fixing pin 2 passes through the connecting ring 11 of the outer pump housing 1, the first connecting protrusion 31 of the pump cover 3, the second connecting protrusion 421 of the side pump frame 42 and the third connecting protrusion 411 of the pump barrel 41 in sequence. The two sides of the fixing pin 2 are fixed by fastening nuts 9 to achieve a rigid connection between the outer pump housing 1, the pump cover 3 and the pump frame assembly 4. At the same time, the outer side of the first connecting protrusion 31 is fitted with the inner side of the connecting ring 11, which further improves the concentricity and stability of the assembly.

[0020] To elaborate further, such as Figure 2 As shown, a gasket groove 32 is provided in the pump cover 3 on the front side of the first connecting protrusion 31, and a damping washer 10 is fitted on the fixing pin 2. The damping washer 10 fits into the gasket groove 32, which can absorb the vibration energy generated during the operation of the water pump, reduce the rigid impact between components, and extend the service life of the equipment.

[0021] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0022] Although this document uses a variety of terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A DC brushless water pump, comprising an outer pump housing (1), a fixing pin (2), a pump cover (3), a pump frame assembly (4), a pump shaft (5), an impeller body (6), and a stator assembly (7), characterized in that: The outer pump casing (1) is cylindrical and covers the outside of the pump frame assembly (4) and the stator assembly (7). The pump cover (3) is installed on both sides of the outer end of the pump frame assembly (4). The pump frame assembly (4) includes a pump cylinder (41), a side pump frame (42), and an inner pump frame (43). The side pump frame (42) is installed on both sides of the pump cylinder (41), and the inner pump frame (43) is installed inside the pump cylinder (41). A cross (44) is formed inside the side pump frame (42) and the inner pump frame (43), and a shaft hole (45) is opened in the middle of the cross (44). The number of impeller bodies (6) is several and they are arranged between the side pump frame (42) and the inner pump frame (43) and between the inner pump frame (43) and the inner pump frame (43). The impeller body (6) is an integrally formed structure and the impeller body (6) is generally disc-shaped. Curved blades (61) are formed inside the impeller body (6) and a flow guide channel (62) is formed between the curved blades (61). A flow guide hole (63) is opened on the front end face of the impeller body (6) and the flow guide hole (63) is connected to the flow guide channel (62). A hub protrusion (64) is formed extending backward inside the impeller body (6). Several mounting grooves (65) are opened on the outer periphery of the impeller body (6). A permanent magnet (8) is fixedly installed in the mounting groove (65). The pump shaft (5) passes through the shaft hole (45) and the hub protrusion (64). The stator assembly (7) is installed outside the pump frame assembly (4).

2. The DC brushless water pump according to claim 1, characterized in that: A connecting cylinder (46) is formed on the outside of the cross (44) of the side pump frame (42), and the inside of the connecting cylinder (46) is connected to both ends of the pump shaft (5).

3. A DC brushless water pump according to claim 1, characterized in that: The outer pump housing (1) has connecting rings (11) extending inward at both ends.

4. A DC brushless water pump according to claim 3, characterized in that: The pump cover (3) has a plurality of first connecting protrusions (31) formed on its outer periphery, and the side pump frame (42) has a plurality of second connecting protrusions (421) formed on its outer periphery. The first connecting protrusions (31) and the second connecting protrusions (421) are identical and fitted and correspondingly arranged. The pump barrel (41) has a third connecting protrusion (411) formed on its outer surface. The fixing pin (2) passes through the connecting ring (11), the first connecting protrusions (31), the second connecting protrusions (421) and the third connecting protrusions (411), and fastening nuts (9) are fixed on both sides of the fixing pin (2).

5. A DC brushless water pump according to claim 4, characterized in that: A gasket groove (32) is provided in the pump cover (3) on the front side of the first connecting protrusion (31), and a shock-absorbing washer (10) is fitted on the fixing pin (2) and the shock-absorbing washer (10) fits into the gasket groove (32).

6. A DC brushless water pump according to claim 4, characterized in that: The outer side of the first connecting protrusion (31) is fitted to the inner side of the connecting ring (11).

Images