Motor pump

Abstract

The utility model relates to the field of motor devices, in particular to a motor pump. The motor pump comprises a pump assembly and a motor assembly, the pump assembly comprises a pump connecting seat and a pump gear, and the pump connecting seat is provided with a positioning concave part; the motor assembly comprises a motor connecting seat and a motor gear, and the motor connecting seat is provided with a positioning convex part; the motor connecting base and the pump connecting base are connected in a matched mode through the positioning convex part and the positioning concave part, and the pump gear and the motor gear which are meshed with each other are clamped between the motor connecting base and the pump connecting base so as to axially fix the pump gear and the motor gear. According to the motor pump, the meshing position of the pump gear and the motor gear is fixed through the pump connecting base and the motor connecting base, so that the meshing stability of the pump gear and the motor gear is achieved, and the working efficiency of the motor pump is improved.

Description

Technical Field

[0001] This utility model relates to the field of motor devices, specifically to a motor pump. Background Technology

[0002] An electric motor pump is a mechanical device that converts electrical energy into mechanical energy, driven by an electric motor, to transport or pressurize fluids (such as liquids or gases). It primarily achieves this by having the motor's gears mesh with gears within the pump body, which in turn rotate a swashplate within the pump body, causing a plunger to reciprocate and thus enabling directional transport or pressurization.

[0003] However, the meshing between the motor gears and pump body gears in existing electric pumps is not smooth, which causes radial force to be generated when the gears are working. This results in a large load on the gears, severe wear on the gear surfaces, and thus increases the temperature rise of the electric pump and reduces its working efficiency. Utility Model Content

[0004] In view of this, the present invention provides an electric motor pump, thereby solving or at least alleviating one or more of the above-mentioned problems and other problems existing in the prior art.

[0005] To achieve the aforementioned objectives, this utility model provides an electric motor pump, which includes a pump assembly and a motor assembly. The pump assembly includes a pump connector and a pump gear, and the pump connector is provided with a positioning recess. The motor assembly includes a motor connector and a motor gear, and the motor connector is provided with a positioning protrusion.

[0006] The motor connector and the pump connector are connected by the positioning protrusion and the positioning recess, and the meshing pump gear and the motor gear are sandwiched between them to fix the pump gear and the motor gear in the axial direction.

[0007] In the motor pump described above, optionally, the positioning recess is provided along the edge of the pump connector, and the positioning protrusion is provided along the edge of the motor connector.

[0008] In the motor pump described above, optionally, the pump connector further includes a protrusion provided along the positioning recess, and the motor connector includes a groove correspondingly provided along the edge of the positioning protrusion, the protrusion being able to be embedded in the groove.

[0009] In the motor pump described above, optionally, the pump connector includes a motor gear cavity and a pump gear cavity, the motor gear cavity and the pump gear cavity are in communication, the motor connector includes a motor gear portion and a pump gear portion, the motor gear portion and the pump gear portion can cover the motor gear cavity and the pump gear cavity.

[0010] In the motor pump described above, optionally, the positioning recess is provided in a figure-eight double arc shape along the edge of the pump gear cavity and the motor gear cavity; the positioning protrusion formed by the protrusion of the pump gear part and the motor gear part is in the shape of a figure-eight double arc.

[0011] In the motor pump described above, optionally, the pump gear cavity is provided with a shaft hole, the pump gear part is provided with a shaft positioning part, the pump assembly further includes a drive shaft, the drive shaft passes through the shaft hole to connect the pump gear, and the end of the drive shaft abuts against the shaft positioning part.

[0012] In the motor pump described above, optionally, an oil groove is provided in the motor gear cavity near the pump gear cavity, the oil groove being used to contain the lubricating medium.

[0013] In the motor pump described above, optionally, the edge of the pump connector extends radially outward to have a first mounting portion, and the edge of the motor connector extends radially outward to have a second mounting portion, the second mounting portion being able to be fixedly connected to the first mounting portion.

[0014] In the motor pump described above, optionally, the first mounting part is provided with a mounting groove, and the second mounting part is provided with a mounting boss adapted to the mounting groove.

[0015] In the motor pump described above, the pump assembly may optionally include a swashplate with a skirt along its edge so that the center of mass of the swashplate is located at its axis.

[0016] This utility model discloses an electric pump comprising a pump assembly and a motor assembly. The pump assembly's pump connector and the motor assembly's motor connector are precisely positioned and connected, with the positioning protrusion of the pump connector embedding into the positioning recess of the motor connector during connection. This tightly clamps the meshing motor gear and pump gear within the pump connector and motor connector, ensuring smooth meshing of the pump gear and motor gear, thereby improving the output efficiency of the pump gear. Attached Figure Description

[0017] The disclosure of this utility model will become more apparent from the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0018] Figure 1 This is a schematic diagram of one embodiment of the electric motor pump of this utility model.

[0019] Figure 2 for Figure 1 A cross-sectional schematic diagram of an embodiment of the electric motor pump.

[0020] Figure 3 for Figure 1 A partial perspective view of an embodiment of the electric motor pump, showing the meshing state of the pump gear and the motor gear inside the electric motor pump.

[0021] Figure 4 for Figure 1 A perspective view of the pump assembly of an embodiment of an electric motor pump, showing the pump connector.

[0022] Figure 5 for Figure 1 A partially enlarged perspective view of the pump assembly of an embodiment of the electric motor pump, showing the structure of the pump gear and the motor gear mounted on the pump connector.

[0023] Figure 6 for Figure 1 A perspective view of the pump assembly of an embodiment of an electric motor pump.

[0024] Figure 7 for Figure 1 A perspective view of the motor assembly of an embodiment of the motor pump, showing the motor connector.

[0025] Figure 8 for Figure 1 A perspective view of the motor connector of the motor assembly in an embodiment of the electric pump.

[0026] Figure 9 for Figure 1 A perspective view of the swashplate of the motor assembly in an embodiment of the motor pump.

[0027] Reference numerals: 1-Pump assembly; 11-Pump connector; 12-Positioning recess; 13-Pump gear cavity; 14-Motor gear cavity; 15-Oil groove; 16-Shaft hole; 17-Protrusion; 18-First mounting part; 19-Mounting groove; 2-Motor assembly; 21-Motor connector; 22-Positioning protrusion; 23-Groove; 24-Mounting boss; 25-Pump gear part; 26-Motor gear part; 27-Motor shaft hole; 28-Second mounting part; 29-Shaft positioning part; 3-Pump gear; 31-Drive shaft; 32-Swashplate; 33-Skirt; 34-Shaft center; 4-Motor gear; 41-Transmission shaft. Detailed Implementation

[0028] Referring to the accompanying drawings and specific embodiments, the structure, composition, features, and advantages of the electric motor pump of this utility model will be described below by way of example; however, all descriptions should not be construed as limiting the utility model in any way.

[0029] Furthermore, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the various drawings, the present invention still allows for any combination or deletion of these technical features (or their equivalents) without any technical obstacle. Therefore, these further embodiments according to the present invention should also be considered within the scope of the description herein.

[0030] It should also be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship of the motor pump shown in the accompanying drawings. They are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0032] In the description of this disclosure, "multiple" means at least two, such as two, three or more, unless otherwise expressly and specifically limited.

[0033] from Figure 1 As can be seen, the electric pump of this utility model includes a pump assembly 1 and a motor assembly 2, wherein the motor assembly 2 is used to supply power to the pump assembly 1. Specifically, the pump assembly 1 includes a pump connector 11, and the motor assembly 2 includes a motor connector 21. The motor connector 21 is fixedly connected to the pump connector 11, thereby connecting the motor assembly 2 to the pump assembly 1.

[0034] like Figure 2 As shown, the motor assembly 2 includes a transmission shaft 41 and a motor gear 4 connected to the end of the transmission shaft 41. The pump assembly 1 includes a drive shaft 31, and a swashplate 32 and a pump gear 3 sequentially connected to the drive shaft 31. The swashplate 32 is mounted at the end of the drive shaft 31 away from the motor assembly 2, and the pump gear 3 is mounted at the end of the drive shaft 31 near the motor assembly 2. The motor gear 4 meshes with the outer circumferential teeth of the pump gear 3 (e.g., ...). Figure 3 As shown in the figure, the pump connecting seat 11 and the motor connecting seat 21 axially clamp the motor gear 4 and the pump gear 3 between them to fix the motor gear 4 and the pump gear 3 axially.

[0035] Combination Figure 3It can be seen that the diameter of the motor gear 4 is smaller than that of the pump gear 3, and the axial length of the motor gear 4 is greater than that of the pump gear 3. The axial length of the motor gear 4 can increase the strength of the motor gear 4 to prevent the motor gear 4 from failing to mesh with the pump gear 3 due to manufacturing errors.

[0036] Understandably, the smaller the parallelism tolerance between the transmission shaft 41 of the motor gear 4 and the drive shaft 31 of the pump gear 3, the higher the meshing degree between the motor gear 4 and the pump gear 3, thereby improving the output efficiency of the motor pump. Furthermore, during operation, a smaller parallelism tolerance between the motor gear 4 and the pump gear 3 results in a smaller radial force component, which reduces friction between them, lowers the temperature rise during pump operation, and extends the service life of the motor pump.

[0037] In order to reduce the parallelism tolerance between the transmission shaft 41 and the drive shaft 31, the electric motor pump of this utility model has been designed with its pump connector 11 and motor connector 21 in mind.

[0038] Specifically, such as Figure 4 As shown, the pump connector 11 of the pump assembly 1 includes a pump gear cavity 13 and a motor gear cavity 14. The pump gear cavity 13 is connected to the motor gear cavity 14, and a shaft hole 16 is provided in the middle of the pump gear cavity 13.

[0039] Pump gear cavity 13 is used to accommodate pump gear 3 (e.g. Figure 6 As shown), the drive shaft 31 passes through the shaft hole 16 and is connected to the pump gear 3. The motor gear cavity 14 is used to accommodate the motor gear 4. The motor gear 4 and the pump gear 3 mesh with each other in the pump gear cavity 13 and the motor gear cavity 14.

[0040] from Figure 4 It can also be seen that the pump gear cavity 13 and the motor gear cavity 14 are connected in a figure-eight double arc shape. A positioning recess 12 is provided along the edge of the figure-eight double arc shape, that is, the positioning recess 12 is also in a figure-eight double arc shape. The positioning recess 12 is used for positioning and installing the motor connecting seat 21.

[0041] In other embodiments, the positioning recess 12 may also be provided along the edge of the pump connector 11, and the positioning recess 12 may be as follows: Figure 4 The continuous arrangement shown may also include multiple positioning recesses 12 distributed along the edge of the pump connector 11.

[0042] Optionally, as shown in the figure, the pump connector 11 may also have a protrusion 17 at the positioning recess 12, with the protrusion 17 arranged along the positioning recess 12.

[0043] Combination Figure 5 As shown, the motor gear cavity 14 is deeper than the pump gear cavity 13 to accommodate the motor gear 4, which has a longer axial length. Further, as... Figure 5 As shown, an oil groove 15 can also be provided near the pump gear cavity 13 in the motor gear cavity 14. The oil groove 15 is used to hold lubricating oil to lubricate the meshing part of the motor gear 4 and the pump gear 3, so that the motor gear 4 and the pump gear 3 rotate more smoothly.

[0044] Optionally, combined Figure 4 , Figure 5 and Figure 6 As can be seen, the pump gear cavity 13 and the motor gear cavity 14 have first mounting portions 18 extending radially outward from their edges. The first mounting portions 18 are used to fix and connect with the motor connecting seat 21 by screws, bolts, etc. As shown in the figure, the first mounting portion 18 located at the edge of the pump gear cavity 13 is set close to the edge of the pump gear cavity 13, while the first mounting portion 18 located at the edge of the motor gear cavity 14 extends outward to be flush with the first mounting portion 18 located at the edge of the pump gear cavity 13, thereby making the overall structure of the pump connecting seat 11 balanced.

[0045] Furthermore, the first mounting part 18 may also be provided with a mounting groove 19, which is used to further position the motor connector 21.

[0046] In this embodiment, the pump connector 11 has four first mounting portions 18 evenly distributed, three of which are provided with mounting grooves 19. In optional embodiments, the number of first mounting portions 18 is not limited; there may be one or more, and each of the multiple first mounting portions 18 may be provided with a mounting groove 19, or the mounting groove 19 may be provided in several of the first mounting portions 18.

[0047] exist Figure 7 In this embodiment, the motor connector 21 of the motor assembly 2 is provided with a pump gear part 25 and a motor gear part 26 connected to the pump gear part 25. The pump gear part 25 is used to house the pump gear 3, and the motor gear part 26 is used to house the motor gear 4. The motor gear part 26 is provided with a motor shaft hole 27 and a transmission shaft 41 (such as...) Figure 1 (As shown) It passes through the motor shaft hole 27 and connects to the motor gear 4.

[0048] Furthermore, the pump gear section 25 is also provided with a shaft positioning section 29. When the pump assembly 1 and the motor assembly 2 are installed, the drive shaft 31 of the pump assembly 1 passes through the shaft hole 16 to connect to the pump gear 3, and its end abuts against the shaft positioning section 29, thereby fixing the axial position of the drive shaft 31.

[0049] like Figure 7 As shown, the pump gear part 25 and the motor gear part 26 protrude toward the pump assembly 1 to form a figure-eight double arc-shaped positioning protrusion 22, so as to fit the figure-eight double arc-shaped positioning recess 12 of the pump assembly 1.

[0050] When the pump assembly 1 is connected to the motor assembly 2, the positioning protrusion 22 of the motor assembly 2 can be embedded into the positioning recess 12 of the pump assembly 1. The special figure-eight double arc shape of the positioning protrusion 22 and the positioning recess 12 allows the pump assembly 1 and the motor assembly 2 to be connected more tightly, thereby allowing the pump gear portion 25 and the motor gear portion 26 of the motor connecting seat 21 to fit more tightly into the pump gear cavity 13 and the motor gear cavity 14 of the pump connecting seat 11.

[0051] At this time, the pump gear 3 and the motor gear 4 are located in the pump gear cavity 13 and the motor gear cavity 14 respectively, and mesh with each other. The axial ends of the pump gear 3 and the motor gear 4 are squeezed by the pump connecting seat 11 and the motor connecting seat 21. The pump connecting seat 11 and the motor connecting seat 21 limit the pump gear 3 and the motor gear 4 in the radial, circumferential and axial directions, so that the parallelism tolerance of the transmission shaft 41 and the drive shaft 31 is within the limited range.

[0052] In other embodiments, the positioning protrusions 22 may also be provided along the edge of the motor connector 21 corresponding to the positioning recesses 12 and are continuously provided. Alternatively, multiple positioning protrusions 22 may be provided distributed on the edge of the motor connector 21 to correspond to multiple positioning recesses 12.

[0053] Optionally, such as Figure 8 As shown, the motor connector 21 may also have a groove 23 along the edge of the positioning protrusion 22, and the groove 23 corresponds to the protrusion 17 of the pump connector 11. When the pump assembly 1 is connected to the motor assembly 2, the protrusion 17 of the pump connector 11 (as shown) Figure 4 As shown, the groove 23 can be embedded, making the connection between the pump connector 11 and the motor connector 21 tighter and more secure, thereby more accurately defining the position of the pump gear 3 and the motor gear 4.

[0054] Optionally, combined Figure 7 and Figure 8 As can be seen, the pump gear part 25 and the motor gear part 26 have a second mounting part 28 extending radially outward from their edges. The second mounting part 28 corresponds to the first mounting part 18 of the pump connecting seat 11. The first mounting part 18 and the second mounting part 28 can be fixedly connected by screws, bolts, etc.

[0055] Furthermore, the second mounting portion 28 may also be provided with a mounting boss 24, which corresponds to the mounting groove 19 of the first mounting portion 18 of the pump connector 11. When the pump assembly 1 is connected to the motor assembly 2, the mounting boss 24 is embedded in the mounting groove 19, thereby making the pump connector 11 more tightly and accurately mounted on the motor connector 21, thereby further clamping the pump gear 3 and the motor gear 4 and defining the meshing position of the pump gear 3 and the motor gear 4.

[0056] In this embodiment, the motor connector 21 has four evenly distributed second mounting portions 28 corresponding to the first mounting portion 18 of the pump connector 11, and three of the second mounting portions 28 have mounting bosses 24 corresponding to the mounting grooves 19. In an optional embodiment, the number of second mounting portions 28 is not limited and can be multiple, depending on the number of first mounting portions 18, and the number of mounting bosses 24 is also determined by the number of mounting grooves 19.

[0057] As shown in the figure, the second mounting part 28 located at the pump gear part 25 is provided close to the edge of the pump gear part 25, and the second mounting part 28 located at the edge of the motor gear part 26 extends outward to be flush with the second mounting part 28 at the pump gear part 25, thereby making the overall structure of the motor connecting seat 21 balanced and corresponding to the pump connecting seat 11.

[0058] To further increase the output efficiency of the electric pump, the swashplate 32 of this invention has a skirt 33 (e.g., Figure 9 As shown in the diagram, the center of mass of the swashplate 32 is located at its axis 34, i.e., the drive shaft 31 connects to the swashplate 32, and the center of mass of the swashplate 32 is located at the drive shaft 31. Therefore, when the drive shaft 31 drives the swashplate 32 to rotate, the swashplate 32 rotates around the drive shaft 31. Since the center of mass of the swashplate 32 is at the axis 34, the rotation of the swashplate 32 is more stable, reducing the radial force and thus reducing wear on the swashplate 32, thereby increasing the output efficiency of the swashplate 32.

[0059] The electric motor pump of this invention achieves precise positioning and connection between the pump connector 11 of the pump assembly 1 and the motor connector 21 of the motor assembly 2. This fixes the meshing positions of the motor gear 4 and the pump gear 3 axially and radially, ensuring that the transmission shaft 41 and the drive shaft 31 are parallel, with their parallelism tolerance maintained within a defined range. This guarantees that the tooth surfaces of the pump gear 3 and the motor gear 4 are uniform and the meshing force is balanced during each meshing operation. This reduces axial friction between the motor gear 4 and the pump gear 3, thereby increasing the output efficiency of the pump gear 3.

[0060] Furthermore, by designing the skirt 33 of the swashplate 32, the center of mass of the swashplate 32 is aligned with its axis 34, thereby reducing the radial impact force experienced by the swashplate 32 during rotation and improving its output efficiency. Simultaneously, it reduces the capacity loss between the motor assembly 2 and the pump assembly 1, thus reducing the temperature rise of the motor assembly 2 and extending the service life of the motor pump.

[0061] In use, the motor assembly 2 of the electric pump drives the motor gear 4 to rotate through the transmission shaft 41 to output power to the pump assembly 1. Specifically, the motor gear 4 drives the pump gear 3 to rotate, so that the transmission shaft 31 rotates, which drives the swashplate 32 to rotate. The swashplate 32 drives the pump plunger in the pump assembly 1 to work, thereby realizing the delivery or pressurization of fluid.

[0062] The technical scope of this utility model is not limited to the contents of the above description. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the scope of this utility model.

Claims

1. An electric motor pump, characterized in that, The electric pump includes a pump assembly (1) and a motor assembly (2). The pump assembly (1) includes a pump connector (11) and a pump gear (3), and the pump connector (11) is provided with a positioning recess (12). The motor assembly (2) includes a motor connector (21) and a motor gear (4), and the motor connector (21) is provided with a positioning protrusion (22). The motor connector (21) and the pump connector (11) are connected by the positioning protrusion (22) and the positioning recess (12), and the meshing pump gear (3) and the motor gear (4) are sandwiched therebetween to fix the pump gear (3) and the motor gear (4) axially.

2. The electric pump as described in claim 1, characterized in that, The positioning recess (12) is provided along the edge of the pump connector (11), and the positioning protrusion (22) is provided along the edge of the motor connector (21).

3. The electric pump as described in claim 2, characterized in that, The pump connector (11) also includes a protrusion (17) provided along the positioning recess (12), and the motor connector (21) includes a groove (23) provided along the edge of the positioning protrusion (22), and the protrusion (17) can be inserted into the groove (23).

4. The electric pump as described in claim 1, characterized in that, The pump connector (11) includes a motor gear cavity (14) and a pump gear cavity (13), the motor gear cavity (14) and the pump gear cavity (13) are connected, and the motor connector (21) includes a motor gear part (26) and a pump gear part (25), the motor gear part (26) and the pump gear part (25) can cover the motor gear cavity (14) and the pump gear cavity (13).

5. The electric pump as described in claim 4, characterized in that, The positioning recess (12) is arranged in a figure-eight double arc shape along the edge of the pump gear cavity (13) and the motor gear cavity (14); the positioning protrusion (22) is formed by the protrusion of the pump gear part (25) and the motor gear part (26), and the positioning protrusion (22) is in a figure-eight double arc shape.

6. The electric pump as described in claim 4, characterized in that, The pump gear cavity (13) is provided with a shaft hole (16), the pump gear part (25) is provided with a shaft positioning part (29), the pump assembly (1) also includes a drive shaft (31), the drive shaft (31) passes through the shaft hole (16) to connect the pump gear (3), and the end of the drive shaft (31) abuts against the shaft positioning part (29).

7. The electric pump as described in claim 4, characterized in that, The motor gear cavity (14) is provided with an oil groove (15) near the pump gear cavity (13), and the oil groove (15) is used to contain the lubricating medium.

8. The electric pump as described in claim 1, characterized in that, The pump connector (11) has a first mounting portion (18) extending radially outward from its edge, and the motor connector (21) has a second mounting portion (28) extending radially outward from its edge, the second mounting portion (28) being able to be fixedly connected to the first mounting portion (18).

9. The electric pump as described in claim 8, characterized in that, The first mounting part (18) is provided with a mounting groove (19), and the second mounting part (28) is provided with a mounting boss (24) that is adapted to the mounting groove (19).

10. The electric pump as claimed in claim 1, characterized in that, The pump assembly (1) also includes a swash plate (32) with a skirt (33) on its edge so that the center of mass of the swash plate (32) is located at its axis (34).

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