Centrifugal pump with improved stator assembly assembling structure

Abstract

A centrifugal pump with an improved stator assembly assembling structure comprises a pump body with a pump cavity, a stator assembly contained in the pump cavity and a rear cover arranged at one axial end of the pump body in a covering mode, and the stator assembly comprises an iron core, a framework fixed to the iron core and an enameled wire wound around the framework. The motor is characterized by further comprising a support arranged between the stator assembly and the rear cover, the outer edge of the support axially extends to form a supporting portion abutting against the yoke portion of the iron core, and the rear cover tightly presses the support through an elastic rubber mat. According to the centrifugal pump with the improved stator assembly assembling structure, the axial locking force of the rear cover is transmitted to the iron core through the support and the elastic rubber mat, the centrifugal pump is easy to assemble, the improved stator assembly is axially locked in the pump cavity, and the reliability and the operation stability of the improved centrifugal pump are improved.

Description

Technical Field

[0001] The invention relates to a centrifugal pump with an improved stator assembly structure, and its IPC classification number is F04D13 / 06. Background Art

[0002] The existing micro centrifugal pump includes a pump body and a stator assembly, wherein the pump body is provided with an independent stator cavity and a rotor cavity, and the stator assembly is interference-fitted into the stator cavity of the pump body. The connection strength between the stator assembly and the pump body of the above-mentioned centrifugal pump is relatively low. When the centrifugal pump is applied to a complete machine with large vibration (such as a car, an excavator, a crusher, etc.), the stator assembly located in the stator cavity is prone to loosening and falling off, causing the rotor to rotate out of control or stop rotating. Therefore, there is a need for improvement. Summary of the invention

[0003] In order to solve the problems described in the background technology, the present invention provides the following technical solutions:

[0004] A centrifugal pump with an improved stator assembly assembly structure includes a pump body with a pump cavity, a stator assembly accommodated in the pump cavity, and a rear cover arranged at one axial end of the pump body, the stator assembly includes an iron core, a frame fixed to the iron core, and an enameled wire wound on the frame, and is characterized in that it also includes a bracket arranged between the stator assembly and the rear cover, the outer edge of the bracket axially extends out to have a support portion abutting against a yoke portion of the iron core, and the rear cover presses the bracket through an elastic rubber pad.

[0005] The centrifugal pump with improved stator assembly assembly structure of the utility model transmits the axial locking force of the rear cover to the iron core through the bracket and the elastic rubber pad. The centrifugal pump is simple to assemble, and the improved stator assembly is axially locked in the pump cavity. The reliability and operating stability of the improved centrifugal pump are improved.

[0006] Furthermore, the elastic rubber pad is columnar, and an axial end surface of the bracket is provided with a mounting hole for mounting the elastic rubber pad.

[0007] Furthermore, the mounting hole is close to the edge of the bracket and is provided with a notch in its radial direction.

[0008] Furthermore, a plurality of convex ribs are protruded from the radial inner wall surface of the mounting hole.

[0009] Furthermore, the axial height of the pump chamber is L5, and the axial direction of the rear cover includes a first abutting surface abutting against the pump body and a second abutting surface abutting against the elastic rubber pad, the axial distance between the first abutting surface and the second abutting surface is L6, the axial distance from the axial end face of the yoke of the iron core close to the bracket to the axial end face of the skeleton away from the bracket is L7, the axial distance from the surface abutting against the elastic rubber pad to the surface abutting against the yoke of the support part and the iron core is L8, and the axial height of the elastic rubber pad is L9, then L7+L8+L9>L5+L6.

[0010] Furthermore, the pump body includes a cylindrical inner shell portion, an annular outer shell portion located radially outside the inner shell portion, and a connecting portion connecting the two, the inner wall surface of the outer shell portion has a radially protruding boss, the outer wall surface of the inner shell portion has a radially protruding rib, the yoke of the iron core is radially concave to form a groove for the boss to penetrate, the circumferentially adjacent teeth of the iron core form a notch, and the rib radially extends into the notch. In the axial projection, the widths of the boss and the rib of the pump body are L1 and L2 respectively, and the widths of the groove and the notch of the iron core are L3 and L4 respectively, then L4-L2>L3-L1 is satisfied.

[0011] Furthermore, a radially protruding columnar positioning portion is provided at the position where the inner wall surface of the shell portion is radially opposite to the boss, and a radially concave positioning groove is provided at the position where the yoke portion of the iron core is radially opposite to the groove, and the positioning portion is inserted and assembled in the positioning groove.

[0012] Furthermore, the number of the grooves is 3 and they are evenly distributed on the yoke.

[0013] Furthermore, the centrifugal pump with improved stator assembly structure also includes a sealing ring arranged between the pump body and the rear cover, and the end faces of the pump body and the rear cover are axially concave to form an installation groove for installing the sealing ring, the radial inner wall surface of the installation groove protrudes a first columnar rib, and the radial outer wall surface thereof protrudes a second columnar rib, and in the axial projection of the pump body, the first rib and the second rib are alternately distributed along the circumferential direction.

[0014] Furthermore, the radial width of the mounting groove is L10, the radial width of the sealing ring is L11, and the radial widths of the radial protrusions of the first rib and the second rib are both R, then L10-2R<L11<L10-R is satisfied.

[0015] Furthermore, the centrifugal pump with improved stator assembly structure also includes an electric control board, the bracket includes a columnar main body, the axial end surface of the main body extends with a second undercut, and the electric control board is buckled on the bracket through the second undercut.

[0016] Furthermore, the centrifugal pump with improved stator assembly structure also includes a capacitor electrically connected to the electric control board, the axial protrusion or recess of the main body forms a capacitor cavity, the edge protrusion of the capacitor cavity has a first inverted buckle, and the capacitor is connected to the capacitor cavity through the first inverted buckle.

[0017] Furthermore, the stator assembly also includes a columnar grounding pin for grounding, and the axial end surface of the iron core is provided with an iron core hole for inserting the grounding pin.

[0018] The more specific design and technical effects of the present invention are further explained in the specific implementation manner in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is an axial cross-sectional view of a centrifugal pump with an improved stator assembly assembly structure according to the utility model;

[0020] Figure 2 This utility model Figure 1 A is a partial enlarged schematic diagram;

[0021] Figure 3 It is a three-dimensional structural schematic diagram of the stator assembly of the utility model;

[0022] Figure 4 It is an axial exploded schematic diagram of the elastic rubber pad, bracket, electric control board, capacitor and stator assembly of the centrifugal pump of the utility model;

[0023] Figure 5 It is a three-dimensional structural schematic diagram of the pump body of the utility model;

[0024] Figure 6 yes Figure 5 A schematic diagram of the partially enlarged structure of B in the middle;

[0025] Figure 7 It is a top view of the pump body of the utility model;

[0026] Figure 8 This is a three-dimensional structural diagram of the iron core of the utility model.

[0027] Fig. 9 It is a three-dimensional structural schematic diagram of the bracket of the utility model;

[0028] Fig.10 yes Fig. 9 A schematic diagram of the partially enlarged structure of C in the middle;

[0029] Fig.11 It is a three-dimensional structural schematic diagram of the bracket of the utility model from another angle;

[0030] Fig.12 is an axial cross-sectional view of the rear cover;

[0031] in:

[0032] 1- pump chamber, 2- impeller chamber, 100- pump body, 110- inner shell, 111- convex rib, 120- outer shell, 121- boss, 122- positioning part, 130- connection part, 140- mounting groove, 141- radial inner wall, 142- first convex rib, 143- radial outer wall, 144- second convex rib, 200- stator assembly, 210- iron core, 211- yoke, 212- groove, 213- positioning groove, 214- iron core hole, 215- notch, 216- tooth part, 220- skeleton, 230- enameled wire, 240- ground pin, 25 0-pin, 300-back cover, 310-first abutment surface, 320-second abutment surface, 330-back cover cavity, 400-sealing ring, 450-screw, 500-pump cover, 510-water inlet, 520-water outlet, 600-bracket, 610-main body, 611-mounting hole, 612-bracket rib, 613-capacitor cavity, 614-first undercut, 615-second undercut, 616-notch, 620-support, 630-reinforcement rib, 700-elastic rubber pad, 800-electric control board, 810-capacitor, 900-rotor, 910-impeller DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See Figures 1 to 3 , Figure 5 and Figure 8The utility model provides a centrifugal pump with an improved stator assembly assembly structure, comprising a pump body 100, a stator assembly 200, a rear cover 300 disposed on one axial side of the pump body 100, a sealing ring 400 disposed axially between the pump body 100 and the rear cover 300, a screw 450 connecting the pump body 200 and the rear cover 300, a pump cover 500, a bracket 600, an elastic rubber pad 700 disposed axially between the bracket 600 and the rear cover 300, and a rotor 900 with an impeller 910 rotatably mounted on the pump body 100. The pump body 100 comprises a cylindrical inner shell 110, a cylindrical outer shell 120 located radially outside the inner shell 110, and a connecting portion 130 connecting the two, and the inner shell 110, the outer shell 120 and the connecting portion 130 form a pump chamber 1. The stator assembly 200 is installed in the pump chamber 1, and includes an iron core 210, a frame 220 fixed on the iron core 210, and an enameled wire 230 wound on the frame 220. The iron core 210 includes an annular yoke 211 and a tooth portion 216 connected to the yoke 211. The pump cover 500 is provided with a water inlet 510 and a water outlet 520. The pump cover is provided on the pump body 100 and encloses the impeller chamber 2 for accommodating the impeller 910 on the pump body 100.

[0035] See Figure 1 , 2 and Fig. 9 The bracket 600 includes a main body 610 in the shape of a ring column and a support part 620 axially extending from the outer edge of the main body 610. In the assembled state, the support part 620 axially abuts against the yoke 211 of the core, and the elastic rubber pad 700 is assembled between the main body 610 and the back cover 300. As a preferred embodiment of the utility model, in order to provide sufficient force to the yoke 211 of the core and prevent the support part 620 from breaking, the support part 620 is a hollow columnar body, and further, the radial outer wall surface of the columnar body is also provided with a reinforcing rib 630. Of course, as other embodiments, the support part 620 can be a plurality of columns abutting against the yoke 211 of the core.

[0036] The centrifugal pump with improved stator assembly assembly structure of the utility model transmits the axial locking force of the rear cover to the iron core through the bracket and the elastic rubber pad, and its assembly is simple, and the improved stator assembly is axially locked in the pump cavity. The reliability and operation stability of the centrifugal pump after the above improvement are improved.

[0037] Preferably, see Figure 4 , Fig. 9 and Fig.10The elastic rubber pad 700 of the utility model is a columnar body. The main body 610 of the bracket 600 is axially away from the stator assembly 200. There are more than three mounting holes 611, and the elastic rubber pad 700 is installed in the mounting holes 611. The above design can ensure that the rear cover transmits the locking force to the iron core in a balanced manner while saving the material consumption of the elastic rubber pad and the bracket. Further, in order to facilitate assembly and make full use of the axial space between the bracket 600 and the rear cover 300, the mounting hole 611 is set at the edge of the bracket 600, and the mounting hole 611 is provided with a notch 616 in the radial direction. Furthermore, in order to facilitate the positioning and installation of the elastic rubber pad and provide deformation space for the elastic rubber pad to prevent the elastic rubber pad from damaging the bracket, the radial inner wall surface of the mounting hole 611 of the bracket is also protruded with several bracket convex ribs 612. During assembly, the outer cylindrical surface of the elastic rubber pad 700 is clamped on the bracket convex rib 612. It should be noted that, as another embodiment, the elastic rubber pad 700 can also be designed as an annular rubber ring, and its two axial surfaces respectively abut against the back cover and the bracket, which can also achieve the transmission of the axial locking force of the back cover to the iron core.

[0038] See Figure 5 and Figure 7 The inner wall surface of the outer shell 120 of the pump body 100 is provided with a radially protruding columnar boss 121, and the axial projection width of the boss 121 is L1. Preferably, the wall thickness of the inner shell 110 of the pump body 100 is 0.5-1.2 mm. This design can improve the magnetic performance of the centrifugal pump. Furthermore, the outer wall surface of the inner shell 110 of the pump body of the utility model is also provided with a radially protruding rib 111. This design can improve the strength of the inner shell 110. The axial projection width of the rib 111 is L2. Figure 8 The outer peripheral surface of the yoke 211 of the utility model is radially concave to form a groove 212 for the boss 121 to penetrate, and a notch 215 is formed between adjacent teeth 216 of the iron core 210. In the installed state, the rib 111 of the pump body is inserted into the notch 215. Furthermore, in the axial projection of the iron core 210, the width of the groove 212 and the width of the notch 215 are L3 and L4 respectively, and the centrifugal pump of the utility model satisfies L4-L2>L3-L1. During the falling process of the centrifugal pump designed as above, the radial shear force of the stator assembly 200 is transferred to the pump body 100 through the groove 212 and the boss 121, so as to avoid damage to the inner shell 110 and cause water leakage when the centrifugal pump falls, thereby improving the reliability of the operation of the centrifugal pump. Furthermore, see Figure 8 The number of the grooves 212 is 3 and they are evenly distributed on the yoke. This design enables the stator assembly to generate a uniform magnetic field, thereby improving the stability of the rotor rotation.

[0039] Further, see Figure 5 , Figure 7 and Figure 8The inner wall surface of the shell 120 of the pump body 100 is also provided with a radially protruding columnar positioning portion 122 at a position radially opposite to the boss 121, and the width of the positioning portion 122 is smaller than the width of the boss 121. The radial outer wall surface of the yoke 211 of the iron core is also provided with a radially concave positioning groove 213 at a position radially opposite to the groove 212, and the width of the positioning groove 213 is smaller than the width of the groove 212. During assembly, the positioning portion 122 of the iron core is inserted into the positioning groove 213. This design ensures that the stator assembly is installed at a preset position to avoid the stator assembly being misplaced and affecting the assembly of subsequent parts.

[0040] Preferably, see 1 and Fig.12 The axial height of the pump chamber 1 of the pump body 100 of the utility model is L5, and the rear cover 300 is provided with a first abutting surface 310 abutting against the pump body 100 and a second abutting surface 320 abutting against the elastic rubber pad 700 in the axial direction, wherein the axial distance between the first abutting surface 310 and the second abutting surface 320 is L6. The axial distance from the axial end surface of the yoke 211 of the iron core 210 close to the bracket 600 to the axial end surface of the skeleton 220 away from the bracket 600 is L7, the axial distance from the surface abutting against the bracket 600 and the surface abutting against the yoke 211 of the iron core 620 is L8, and the axial height of the elastic rubber pad 700 is L9, which satisfies L7+L8+L9>L5+L6. This design can reduce the problem that the rear cover cannot transmit the locking force to the iron core in a balanced manner due to the excessive assembly gap caused by insufficient manufacturing precision of parts, and further improve the stability of centrifugal pump assembly.

[0041] See Figure 1 , Figure 5 and Figure 6 The end surface of the pump body 100 of the utility model that covers the rear cover 300 is axially concave to form an installation groove 140 for installing the sealing ring 400. The radial inner wall surface 141 of the installation groove 140 protrudes a first columnar convex rib 142, and the radial outer wall surface 143 thereof protrudes a second columnar convex rib 144. In the axial projection of the pump body 100, the first convex rib 142 and the second convex rib 144 are alternately distributed along the circumferential direction. This design can prevent the sealing ring assembled in the installation groove from falling off and improve the stability of the installation.

[0042] Further, see Figure 1 and Figure 6 The radial width of the installation groove 140 of the pump body 100 of the utility model is L10, the radial width of the sealing ring 400 is L11, and the radial widths of the radial protrusions of the first rib 142 and the second rib 144 are both R, which satisfies L10-2R<L11<L10-R. This design can reduce the problem of the rear cover being unable to balance the locking force and transmit it to the iron core due to the excessive assembly gap caused by the insufficient manufacturing precision of the parts, and further improve the stability of the centrifugal pump assembly.

[0043] See Figure 1 , Figure 4 and Fig. 9 The centrifugal pump of the utility model further includes an electric control board 800 disposed in the accommodation space surrounded by the pump body 100 and the rear cover 300. To facilitate the fixed installation of the electric control board 800, preferably, the axial end surface of the main body 610 is provided with a raised second undercut 615, and the electric control board 800 is buckled onto the bracket 600 through the second undercut 615.

[0044] Further, see Figure 4 The centrifugal pump of the utility model further includes a capacitor 810 electrically connected to the electric control board 800, in order to reduce the problem of the capacitor 810 being loosened and falling from the electric control board 800 during operation. Figure 1 and Fig.11 The main body 610 of the bracket 600 of the utility model is axially concave to form a capacitor cavity 613, and the edge of the capacitor cavity 613 protrudes a first undercut 614, and the capacitor 810 of the electric control board 800 is buckled in the capacitor cavity 613 through the first undercut 614. Of course, as other embodiments, the main body 610 of the bracket 600 axially protrudes to form a capacitor cavity, and the edge of the capacitor cavity protrudes to form an undercut for buckling the capacitor, which can also achieve the above effect.

[0045] Prioritize, see Figure 3 and Figure 8 The stator assembly 200 of the utility model is also provided with a columnar grounding pin 240 for grounding and a columnar plug pin 230 for connecting the enameled wire 230 to an external power source. The axial end surface of the iron core 210 is provided with an iron core hole 214. During assembly, the grounding pin 240 is inserted into the iron core hole 214. The above design can be used to protect the stator assembly from short circuit, preventing the pump body from burning out due to a short circuit in the stator assembly.

Claims

1. A centrifugal pump with an improved stator assembly assembly structure, comprising a pump body (100) having a pump cavity (1), a stator assembly (200) accommodated in the pump cavity (1), and a rear cover (300) provided on one axial end of the pump body (100), wherein the stator assembly (200) comprises an iron core (210), a frame (220) fixed on the iron core, and an enameled wire (230) wound on the frame, characterized in that: It also includes a bracket (600) arranged between the stator assembly (200) and the rear cover (300), wherein the outer edge of the bracket (600) axially extends to have a support portion (620) that abuts against a yoke portion (211) of the iron core, and the rear cover (300) presses the bracket (600) via an elastic rubber pad (700).

2. The centrifugal pump with improved stator assembly structure according to claim 1, characterized in that: The elastic rubber pad (700) is columnar, and an axial end surface of the bracket (600) is provided with a mounting hole (611) for mounting the elastic rubber pad (700).

3. The centrifugal pump with improved stator assembly structure according to claim 2, characterized in that: The mounting hole (611) is close to the edge of the bracket (600) and is provided with a notch (616) in its radial direction.

4. The centrifugal pump with improved stator assembly structure according to claim 2 or 3, characterized in that: The radial inner wall surface of the mounting hole (611) is protruded with a plurality of convex ribs (612).

5. The centrifugal pump with improved stator assembly structure according to claim 1 or 2, characterized in that: The axial height of the pump chamber (1) is L5, the axial direction of the rear cover (300) includes a first abutting surface (310) abutting against the pump body (100) and a second abutting surface (320) abutting against the elastic rubber pad (700), the axial distance between the first abutting surface (310) and the second abutting surface (320) is L6, the axial distance from the axial end surface of the yoke (211) of the iron core (210) close to the bracket (600) to the axial end surface of the skeleton (220) away from the bracket (600) is L7, the axial distance from the surface abutting against the elastic rubber pad (700) of the bracket (600) to the surface abutting against the yoke (211) of the iron core of the support portion (620) is L8, the axial height of the elastic rubber pad (700) is L9, and L7+L8+L9>L5+L6 is satisfied.

6. The centrifugal pump with improved stator assembly structure according to claim 1, characterized in that: The pump body (100) comprises a cylindrical inner shell (110), an annular outer shell (120) located radially outside the inner shell (110), and a connecting portion (130) connecting the two, the inner wall surface of the outer shell (120) radially protrudes a boss (121), the outer wall surface of the inner shell (110) radially protrudes a rib (111), and the yoke (211) of the iron core is radially concave to form a groove (130) for the boss (121) to penetrate. 212), circumferentially adjacent teeth (216) of the iron core (210) form a notch (215), the convex rib (111) radially extends into the notch (215), in axial projection, the widths of the boss (121) and the convex rib (111) of the pump body (100) are L1 and L2 respectively, the widths of the groove (212) and the notch (215) of the iron core are L3 and L4 respectively, and L4-L2>L3-L1 is satisfied.

7. The centrifugal pump with improved stator assembly structure according to claim 6, characterized in that: A radially protruding columnar positioning portion (122) is also provided at a position where the inner wall surface of the shell portion (120) and the boss (121) are radially opposite to each other, and a radially concave positioning groove (213) is also provided at a position where the yoke portion (211) of the iron core and the groove (212) are radially opposite to each other, and the positioning portion (122) is inserted and assembled in the positioning groove (213).

8. The centrifugal pump with improved stator assembly structure according to claim 6, characterized in that: The number of the grooves (212) is three and they are evenly distributed on the yoke (211).

9. The centrifugal pump with improved stator assembly structure according to claim 1, characterized in that: The invention also comprises a sealing ring (400) arranged between the pump body (100) and the rear cover (300); the end surfaces of the pump body (100) and the rear cover (300) covering each other are axially concave to form an installation groove (140) for installing the sealing ring (400); the radial inner wall surface (141) of the installation groove (140) protrudes a first columnar convex rib (142); the radial outer wall surface (143) thereof protrudes a second columnar convex rib (144); in the axial projection of the pump body (100), the first convex rib (142) and the second convex rib (144) are alternately distributed along the circumferential direction.

10. The centrifugal pump with improved stator assembly structure according to claim 9, characterized in that: The radial width of the installation groove (140) is L10, the radial width of the sealing ring (400) is L11, and the radial widths of the radial protrusions of the first convex rib (142) and the second convex rib (144) are both R, thus satisfying L10-2R<L11<L10-R.

11. The centrifugal pump with improved stator assembly structure according to claim 1, characterized in that: The electronic control board (800) is also included. The bracket (600) includes a columnar main body (610). A second undercut (615) extends from the axial end surface of the main body (610). The electronic control board (800) is buckled onto the bracket (600) via the second undercut (615).

12. The centrifugal pump with improved stator assembly structure according to claim 11, characterized in that: It also includes a capacitor (810) electrically connected to the electric control board (800), the axial protrusion or indentation of the main body (610) forms a capacitor cavity (613) for accommodating the capacitor, the edge protrusion of the capacitor cavity (613) has a first undercut (614), and the capacitor (810) is buckled into the capacitor cavity (613) through the first undercut (614).

13. The centrifugal pump with improved stator assembly structure according to claim 1 or 12, characterized in that: The stator assembly (200) further comprises a columnar grounding pin (240) for grounding, and an axial end surface of the iron core (210) is provided with an iron core hole (214) for inserting the grounding pin (240).

Images