Cycloid rotor pump with improved pump body structure

Abstract

A cycloid rotor pump with an improved pump body structure comprises a pump body, a pump cover, a stator assembly, a rotor, a rotor shell, an inner rotor and an outer rotor, the stator assembly comprises an iron core, a framework, an enameled wire and an inserting piece, the rotor shell comprises a main body part and a surrounding edge part, an axial through shaft hole is formed in the center of the main body part, and an axial through liquid inlet hole is formed in the radial outer side of the shaft hole. The pump body is formed by placing the stator assembly and the rotor shell as inserts in the mold cavity in an injection molding mode, the side, facing the rotor, of the main body part is provided with a first positioning part for preventing the rotor shell from rotating in the mold cavity, and the iron core is provided with a second positioning part for preventing the stator assembly from rotating in the mold cavity. The plastic of the pump body wraps the framework, the enameled wire, the iron core and the periphery of the rotor shell and forms an installation cavity for containing the rotor, and at least the first positioning part, the second positioning part and the tooth part end face of the side, back to the rotor shell, of the iron core are exposed out of the pump body. According to the cycloid rotor pump with the design, production of the pump body is facilitated, and meanwhile the stability of the pump body is considered.

Description

Technical Field

[0001] The invention relates to a cycloid rotor pump with an improved pump body structure, and its IPC classification number is F04C 2 / 10. Background Art

[0002] The existing cycloid rotor pump (or electronic oil pump) is generally made of metal as shown in the prior patent publication number CN115143098A, and the patent name is electronic oil pump. In order to simplify the assembly of the cycloid rotor pump and the lightweight design of the cycloid rotor pump, the pump body can use the stator as an insert and be injection molded into an integrated pump body structure. However, the integrated pump body formed by injection molding is insufficient in strength and is easily worn and leaked under the operation of the inner rotor and the outer rotor. 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 cycloid rotor pump with an improved pump body structure comprises a pump body, a pump cover arranged on the pump body, a stator assembly, a rotor, a rotor shell made of metal, an inner rotor and an outer rotor accommodated in the inner cavity of the rotor shell, the stator assembly comprises a frame arranged on an iron core, enameled wires wound on the frame, and an insert fixed on the frame and connected to the enameled wires, characterized in that the rotor shell has a columnar main body and an annular surrounding edge portion axially protruding from the main body, an axial hole penetrating axially is provided in the center of the main body, and an axial liquid inlet hole penetrating axially is provided on the radial outer side of the axial hole, the pump body is formed by injection molding with the stator assembly and the rotor shell as inserts placed in a mold cavity, a first positioning portion is provided on the side of the main body facing the rotor to prevent the rotor shell from rotating in the mold cavity, the iron core is provided with a second positioning portion to prevent the stator assembly from rotating in the mold cavity, the plastic of the pump body wraps the frame, the enameled wire, part of the iron core and the outer periphery of the rotor shell to form an installation cavity for accommodating the rotor, and at least the first positioning portion, the second positioning portion and the tooth end face of the iron core facing away from the rotor shell are exposed to the pump body.

[0005] The cycloid rotor pump of the utility model has a pump body formed by insert injection molding of a metal rotor shell and a stator assembly, wherein the first positioning portion, the second positioning portion and the tooth end surface of the two inserts provide positioning for the mold, thereby facilitating the production of the pump body while taking into account the stability of the pump body.

[0006] Further, the first positioning portion is an axial hole arranged on the side of the main body of the rotor shell facing away from the pump cover, or a groove formed by a radial inward concave outer surface of a cylinder protruding on the end face of the main body of the rotor shell facing away from the pump cover, and the second positioning portion is an axially open hole arranged on the yoke of the iron core, or a groove formed by a radial inward concave outer surface of the yoke of the iron core.

[0007] Furthermore, the pole arc surface of the iron core is exposed on the pump body.

[0008] Furthermore, the stator assembly also includes a ring-shaped or notched ring-shaped sealing rubber disk installed on the frame, and the axial end surface of the sealing rubber disk is provided with a rubber disk through hole for the insert to pass through.

[0009] Furthermore, the through hole of the rubber disc is a countersunk hole, which is exposed outside the pump body and is filled with sealant.

[0010] Furthermore, the inner cavity depth of the rotor shell is L1, the depth of the shaft hole is L2, and the distance from the rotor shaft away from one end of the rotor shell to the opening of the shaft hole facing away from the inner rotor is L3, then L1 = (0.47 ~ 0.56) * L3, L2 = (0.47 ~ 0.56) * L3.

[0011] Furthermore, the inner wall of the shaft hole is radially concave to form a pressure relief groove, and the axial end surface of the main body is provided with a concave liquid storage groove and a flow groove connecting the liquid storage groove with the pressure relief groove.

[0012] Furthermore, the inner wall of the shaft hole is indented to form a spiral lubrication groove.

[0013] Furthermore, the cycloid rotor pump with an improved pump body structure also includes a cover plate which is seal-welded to the pump body and divides the installation cavity into a control cavity and a rotor cavity for accommodating the rotor.

[0014] Furthermore, the pump cover includes a disc-shaped pump cover main body and a cylindrical liquid inlet portion protruding from one axial side of the pump body main body, a first liquid inlet hole penetrating the pump body main body and a second liquid inlet hole located radially outside the first liquid inlet hole are provided at the center of the liquid inlet portion, and a side of the pump cover main body facing away from the liquid inlet portion is recessed to form a liquid outlet channel, and a liquid outlet is formed on the radial outer side of the liquid outlet channel.

[0015] Furthermore, the rotating shaft of the rotor is provided with an axially penetrating rotating shaft hole, and the rotating shaft hole is arranged opposite to the first liquid inlet hole.

[0016] Furthermore, the cycloid rotor pump with an improved pump body structure also includes a filter cover arranged on the pump cover, and the filter cover includes an annular mounting frame and a filter screen fixed on the mounting frame.

[0017] 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

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the cycloid rotor pump of the utility model;

[0019] Figure 2 It is a cross-sectional view of the cycloid rotor pump of the utility model;

[0020] Figure 3 yes Figure 2 A is a partial enlarged schematic diagram;

[0021] Figure 4 It is a three-dimensional structural schematic diagram of the stator assembly of the utility model;

[0022] Figure 5 It is a three-dimensional structural schematic diagram of the rotor shell of the utility model;

[0023] Figure 6 It is a three-dimensional structural schematic diagram of the rotor shell of the utility model from another angle;

[0024] Figure 7 It is a top view of the pump body of the utility model;

[0025] Figure 8 It is a three-dimensional structural schematic diagram of the sealing disk of the utility model;

[0026] Fig. 9 It is a three-dimensional structural schematic diagram of the pump cover of the utility model;

[0027] Fig.10 It is a top view of the pump cover of the utility model;

[0028] Fig.11 It is a three-dimensional structural schematic diagram of the filter cover of the utility model;

[0029] in:

[0030] 10-installation cavity, 11-control cavity, 12-rotor cavity, 13-rotor shell cavity, 100-pump body, 200-pump cover, 210-pump cover body, 211-liquid outlet, 212-liquid outlet channel, 220-liquid inlet, 230-first liquid inlet hole, 240-second liquid inlet hole, 300-stator assembly, 310-iron core, 311-second positioning part, 312-tooth part, 313-pole arc surface, 314-yoke part, 320-skeleton, 330-enameled wire, 340-insert, 350-sealing disk, 35 1- rubber disc through hole, 360- sealant, 400- rotor, 410- shaft, 411- shaft hole, 420- permanent magnet, 510- inner rotor, 520- outer rotor, 600- rotor shell, 610- main body, 611- shaft hole, 612- liquid inlet hole, 620- first positioning part, 630- pressure relief groove, 640- liquid storage tank, 650- flow groove, 660- lubrication groove, 670- surrounding edge, 700- circuit board, 800- cover plate, 900- filter cover, 910- mounting frame, 920- filter screen DETAILED DESCRIPTION

[0031] 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.

[0032] See Figures 1 to 4 The utility model discloses a cycloid rotor pump with an improved pump body structure, comprising a pump body 100, a pump cover 200 covered on the pump body 100, a stator assembly 300, a rotor 400 rotatably mounted on the pump body 100, an inner rotor 510, an outer rotor 520 and a rotor shell 600. The stator assembly 300 comprises an iron core 310, a skeleton 320 fixed on the iron core 310, an enameled wire 330 wound on the skeleton 320 and an insert 340 fixed on the skeleton 320 and connected to the enameled wire 330, the iron core 310 comprises an annular yoke 314 and a plurality of teeth 312 extending radially from the yoke, and the yoke 314 is provided with a second positioning portion 311 for preventing the stator assembly from rotating. To facilitate manufacturing, preferably, the second positioning portion 311 is a groove formed inwardly on the radial outer surface of the yoke 314 . Of course, as other embodiments, the second positioning portion 311 may also be an axially open hole set on the axial end face of the yoke 314 .

[0033] See Figure 5 and Figure 6 The rotor shell 600 is a metal shell, including a columnar main body 610 and an annular peripheral edge 670 axially protruding from the main body 610. The main body 610 and the peripheral edge 670 enclose a rotor shell cavity 13 for accommodating the inner rotor and the outer rotor. The axial end surface of the main body 610 is provided with an axially penetrating shaft hole 611 and an axially penetrating liquid inlet hole 612 located radially outside the shaft hole 611 at the center. The side facing the rotor (not shown) is provided with a first positioning portion 620 for preventing rotation. For the convenience of production and processing, preferably, the first positioning portion 620 is an axial hole provided on the side of the main body 610 of the rotor shell 600 facing away from the pump cover 200. Further, the axial hole is provided on the end surface of the main body 610 facing away from the pump cover 200; or the axial hole is provided at the center of a hollow column protruding from the end surface of the main body 610 facing away from the pump cover 200. Of course, as other embodiments, the first positioning portion 620 may also be a groove (not shown) formed by a radially inwardly concave outer surface of a column that is protruding on the end surface of the main body 610 of the rotor shell 600 facing away from the pump cover 200 .

[0034] See Figure 2 and Figure 5Preferably, the inner wall of the shaft hole 611 of the rotor shell 600 of the utility model is radially concave to form a pressure relief groove 630, and the main body 610 of the rotor shell 600 is provided with a concave liquid storage tank 640 and a flow groove 650 facing the axial end face of the inner rotor, and the flow groove 650 connects the liquid storage tank 640 with the pressure relief groove 630. The above design can avoid the cycloidal rotor pump from rotating poorly due to uneven force on the inner and outer rotors when working, thereby improving the working stability of the cycloidal rotor. Preferably, the inner wall of the shaft hole 611 of the utility model is provided with a spiral lubrication groove 660, and the liquid in the rotor shell cavity 13 can pass through the lubrication groove 660 to lubricate the rotor shaft 410.

[0035] See Figure 2 , Figure 3 and Figure 7 The pump body 100 of the utility model is formed by insert injection molding of the axially arranged stator assembly 300 and the rotor shell 600. After injection molding, the plastic of the pump body 100 wraps the enameled wire 330, the skeleton 320, part of the iron core 310 and the outer periphery of the rotor shell 600, and forms an installation cavity 10 for accommodating the rotor 400 on the radial inner side of the iron core 310, wherein the axial hole (i.e., the first positioning portion 620) on the end face of the rotor shell 600, the rotor shell cavity 13, the groove (the second positioning portion 311) on the radial surface of the yoke 314 of the iron core, and the end face of the tooth portion 312 of the iron core 310 facing away from the rotor shell 600 are exposed to the pump body 100. Furthermore, in order to reduce the gap between the iron core 310 and the rotor 400 and improve the performance of the cycloid rotor pump, the pole arc surface 313 of the iron core 310 of the utility model is also radially exposed to the pump body 100. The working principle of the cycloid rotor pump of the utility model can be referred to the patent literature of the background technology, which will not be repeated here. The pump body 100 designed as above is simple to manufacture, and the rotor shell cavity 13 for the inner and outer rotors to be installed is stable in size and not easy to deform and wear, and the overall stability of the pump body is high.

[0036] See Figure 3 , Figure 4 , Figure 7 and Figure 8 Preferably, in order to prevent the liquid in the installation cavity from infiltrating from the pole arc surface 313 and then leaking out from the junction of the pump body 100 and the plug pin 340, the stability of the cycloid rotor pump is improved. The stator assembly 300 of the utility model also includes a notched annular columnar sealing disk 350 installed on the skeleton 320. The axial end face of the sealing disk 350 is provided with a rubber disk through hole 351 for the plug 340 to pass through. Preferably, the sealing disk 350 is made of rubber material. Of course, as other embodiments, the sealing disk can also be designed to be annular. Furthermore, in order to prevent the liquid in the installation cavity from leaking out, the rubber disk through hole 351 is designed to be a countersunk hole, and the rubber disk through hole 351 is poured with sealant (not shown).

[0037] See Fig. 9 and Fig.10 The pump cover 200 of the utility model includes a disc-shaped pump cover main body 210 and a cylindrical liquid inlet portion 220 protruding from one axial side of the pump body main body 210. The side of the pump cover main body 210 facing away from the liquid inlet portion 220 is concave to form a liquid outlet channel 212 with a liquid outlet 211. The bottom surface of the liquid inlet portion 220 is provided with a first liquid inlet hole 230 that penetrates the pump body main body 210 and the liquid inlet portion 220, and a second liquid inlet hole 240 located on the periphery of the first liquid inlet hole 230. The pump cover of the utility model is simple to produce and has a compact structure.

[0038] See Figure 2 , the rotor 400 of the utility model includes a rotating shaft 410 and a permanent magnet 420 fixedly connected to the rotating shaft 410. Further, in order to improve the drainage efficiency of the cycloid water pump, a rotating shaft hole 411 is provided in the axial direction of the rotating shaft 410, and after the assembly is completed, the rotating shaft hole 411 is arranged opposite to the first liquid inlet hole 230. Further, the inner cavity depth of the rotor shell 600 is L1, the depth of the shaft hole 611 is L2, and the distance from the rotating shaft 410 of the rotor 400 away from the end of the rotor shell 600 to the opening of the shaft hole 611 facing away from the inner rotor 510 is L3. Experiments have shown that when L1 = (0.47 ~ 0.56) * L3 and L2 = (0.47 ~ 0.56) * L3 are satisfied, the rotation swing of the rotor 400 is less, and the overall working stability of the cycloid rotor pump is better.

[0039] See Figure 2 The cycloid rotor pump of the utility model further includes a circuit board 700 and a cover plate 800, wherein the cover plate 800 is sealed and welded to the pump body and divides the mounting cavity 10 into a control cavity 11 and a rotor cavity 12 for accommodating the rotor, and the circuit board 700 is mounted on the control cavity and electrically connected to the plug 340. The above design can stably assemble the circuit board on the pump body, avoid the liquid in the mounting cavity from contacting the circuit board and causing damage, and improve the working stability of the cycloid rotor pump.

[0040] To reduce the impact of external debris on the inner and outer rotors of the cycloid rotor pump and improve the working stability of the cycloid rotor pump. Figure 2 and Fig.11 The cycloid rotor pump of the present invention also includes a filter cover 900 disposed on the pump cover 200. Furthermore, to facilitate production and processing, the filter cover 900 includes an annular mounting frame 910 and a filter screen 920 fixed on the mounting frame 910, wherein the filter cover 900 is buckled onto the pump cover 200.

Claims

1. A cycloid rotor pump with an improved pump body structure, comprising a pump body (100), a pump cover (200) arranged on the pump body, a stator assembly (300), a rotor (400), a rotor shell (600) made of metal, an inner rotor (510) and an outer rotor (520) accommodated in the inner cavity of the rotor shell (600), wherein the stator assembly (300) comprises a skeleton (320) arranged on an iron core (310), an enameled wire (330) wound around the skeleton (320), and an insert (340) fixed on the skeleton (320) and connected to the enameled wire (330), characterized in that: The rotor shell (600) comprises a columnar main body (610) and an annular peripheral edge (670) axially protruding from the main body (610); an axially penetrating axial hole (611) is provided in the center of the main body (610); an axially penetrating liquid inlet (612) is provided radially outside the axial hole (611); the pump body (100) is formed by injection molding with the stator assembly (300) and the rotor shell (600) as inserts placed in a mold cavity; a first stator (670) is provided on the side of the main body (610) facing the rotor to prevent the rotor shell (600) from rotating in the mold cavity; The iron core (310) is provided with a second positioning portion (311) for preventing the stator assembly (300) from rotating in the mold cavity. The plastic of the pump body (100) wraps the skeleton (320), the enameled wire (330), part of the iron core (310) and the outer periphery of the rotor shell (600) to form an installation cavity (10) for accommodating the rotor (400). At least the first positioning portion (620), the second positioning portion (311) and the tooth end face (312) of the iron core (310) on the side facing away from the rotor shell (600) are exposed to the pump body (100).

2. The cycloid rotor pump with improved pump body structure according to claim 1, characterized in that: The first positioning portion (620) is an axial hole arranged on the side of the main body (610) of the rotor shell (600) facing away from the pump cover (200) or a groove formed by a radial inward concave outer surface of a column with a protruding end surface arranged on the side of the main body (610) of the rotor shell (600) facing away from the pump cover (200), and the second positioning portion (311) is an axially open hole arranged on the yoke of the iron core (310) or a groove formed by a radial inward concave outer surface of the yoke of the iron core (310).

3. The cycloid rotor pump with an improved pump body structure according to claim 1 or 2, characterized in that: The pole arc surface (313) of the iron core (310) is exposed outside the pump body (100).

4. The cycloid rotor pump with improved pump body structure according to claim 3, characterized in that: The stator assembly (300) further comprises a ring-shaped or notched ring-shaped sealing rubber disk (350) mounted on the frame (320), and an axial end surface of the sealing rubber disk (350) is provided with a rubber disk through hole (351) for the insert (340) to pass through.

5. The cycloid rotor pump with an improved pump body structure according to claim 4, characterized in that: The rubber disc through hole (351) is a countersunk hole, which is exposed to the pump body (100) and is filled with sealant (360).

6. The cycloid rotor pump with improved pump body structure according to claim 1, characterized in that: The inner cavity depth of the rotor shell (600) is L1, the depth of the shaft hole (611) is L2, and the distance from the end of the rotating shaft (410) of the rotor (400) away from the rotor shell (600) to the opening of the shaft hole (611) facing away from the inner rotor (510) is L3, then L1=(0.47-0.56)*L3, L2=(0.47-0.56)*L3.

7. The cycloid rotor pump with an improved pump body structure according to claim 1, characterized in that: The inner wall of the shaft hole (611) is radially concave to form a pressure relief groove (630), and the axial end surface of the main body (610) is provided with a concave liquid storage groove (640) and a flow groove (650) connecting the liquid storage groove (640) and the pressure relief groove (630).

8. The cycloid rotor pump with an improved pump body structure according to claim 1 or 7, characterized in that: The inner wall of the shaft hole (611) is indented to form a spiral lubrication groove (660).

9. The cycloid rotor pump with an improved pump body structure according to claim 1, characterized in that: It also includes a cover plate (800) which is seal-welded to the pump body and divides the installation cavity (10) into a control cavity (11) and a rotor cavity (12) for accommodating the rotor (400).

10. The cycloid rotor pump with an improved pump body structure according to claim 1, characterized in that: The pump cover (200) comprises a disc-shaped pump cover body (210) and a cylindrical liquid inlet portion (220) protruding from one axial side of the pump cover body (210); a first liquid inlet hole (230) penetrating the pump cover body (210) and a second liquid inlet hole (240) located radially outside the first liquid inlet hole (230) are provided at the center of the liquid inlet portion (220); a side of the pump cover body (210) facing away from the liquid inlet portion (220) is recessed to form a liquid outlet channel (212); a liquid outlet (211) is formed radially outside the liquid outlet channel (212).

11. The cycloid rotor pump with an improved pump body structure according to claim 10, characterized in that: The rotating shaft (410) of the rotor (400) is provided with a rotating shaft hole (411) which penetrates axially, and the rotating shaft hole (411) is arranged opposite to the first liquid inlet hole (230).

12. The cycloid rotor pump with an improved pump body structure according to claim 1, characterized in that: The invention also comprises a filter cover (900) which is covered on the pump cover (200), wherein the filter cover (900) comprises an annular mounting frame (910) and a filter screen (920) fixed on the mounting frame (910).

Images