Cycloid rotor pump

Abstract

A cycloid rotor pump comprises a pump body, a rotor cavity cover, a pump cover, an inner rotor, an outer rotor and an inner sleeve, the inner sleeve is provided with an axial through hollow hole allowing the outer rotor to be installed in a sleeved mode, and the outer wall face of the inner sleeve is provided with a first through hole and a second through hole. The first through hole and the second through hole are provided with a first partition assembly and a second partition assembly which abut against the radial outer wall face of the outer rotor in the radial direction correspondingly, and in the axial projection of the cycloid rotor pump, at least part of the projection of the face, abutting against the outer wall face of the outer rotor, of the first partition assembly falls into a first partition area D1; the projection of the face, abutting against the outer wall face of the outer rotor, of the second separation assembly at least partially falls on the second separation area D2. According to the cycloid rotor pump with the design, on the premise that a radial movement gap is formed between the inner sleeve and the outer rotor, liquid is prevented from flowing back to the position close to the suction inlet from the movement gap of the discharge port, so that the flow loss during working of the cycloid rotor pump is reduced, and the working efficiency of the cycloid rotor pump is improved.

Description

Technical Field

[0001] This utility model relates to a cycloidal rotor pump, whose IPC classification number is F04C 2 / 10. Background Technology

[0002] The existing cycloidal rotor pump includes a pump body, a rotor chamber cover located at one axial end of the pump body, a pump cover with an inlet and an outlet, and an inner rotor and an outer rotor located within the working chamber of the rotor chamber cover. The inner rotor is driven by the rotor. The pump cover has an inlet connected to the inlet and an outlet connected to the outlet on its axial end face facing the rotor chamber cover. To prevent motion interference between the outer rotor and the wall of the working chamber of the rotor chamber cover during rotation, a radial clearance is provided between the outer rotor and the wall of the working chamber of the rotor chamber cover. During operation, the liquid in the rotor chamber flows into the aforementioned radial clearance and flows back from the side near the outlet to the side near the inlet, causing a flow loss. This flow loss becomes more pronounced as the operating pressure of the cycloidal rotor pump increases, thus requiring improvement. Utility Model Content

[0003] To address the problems described in the background section, this utility model provides the following technical solution:

[0004] A cycloidal rotor pump includes a pump body, a rotor, a stator, a rotor cavity cover disposed on one axial side of the pump body, a pump cover disposed on the rotor cavity cover, an inner rotor and an outer rotor housed within a working cavity of the rotor cavity cover. The pump cover has an inlet and an outlet, and its axial side facing the rotor cavity cover has an inlet communicating with the inlet and an outlet communicating with the outlet. The pump cover is characterized by further including an annular cylindrical inner sleeve disposed within the working cavity and located between the inner wall of the working cavity and the outer wall of the outer rotor. The inner sleeve has an axially penetrating hollow hole for the outer rotor to be fitted and installed. The outer wall of the inner sleeve has a first through hole and a second through hole radially penetrating the hollow hole. The first through hole and the second through hole respectively have a first partition component and a second partition component radially abutting against the radial outer wall of the outer rotor. In the axial projection of the cycloidal rotor pump, the outlet and the inlet are aligned along... The counterclockwise circumferential endpoints are S1 and S2, and S3 and S4, respectively. Rays starting from the center point S of the pump cover and passing through endpoints S1, S2, S3, and S4 are L1, L2, L3, and L4 in a counterclockwise direction. Ray L2 and ray L3 form a first dividing region D1 in a counterclockwise direction, and ray L4 and ray L1 form a second dividing region D2 in a counterclockwise direction. The projection of the surface of the first dividing component that abuts against the outer wall of the outer rotor falls at least partially in the first dividing region D1, and the projection of the surface of the second dividing component that abuts against the outer wall of the outer rotor falls at least partially in the second dividing region D2; or, the projection of the surface of the first dividing component that abuts against the outer wall of the outer rotor falls at least partially in the second dividing region D2, and the projection of the surface of the second dividing component that abuts against the outer wall of the outer rotor falls at least partially in the first dividing region D1.

[0005] The cycloidal rotor pump of this utility model has a first partition component and a second partition component that are radially abutting against the radial outer wall surface of the outer rotor. This design can ensure that there is a radial movement gap between the inner sleeve and the outer rotor, while blocking the backflow of liquid from the movement gap near the discharge port (i.e., the high-pressure side) to the suction port (i.e., the low-pressure side), so as to reduce the flow loss during the operation of the cycloidal rotor pump and improve the working efficiency of the cycloidal rotor pump.

[0006] Furthermore, the first through hole and the second through hole are arranged symmetrically.

[0007] Furthermore, the first partition assembly and the second partition assembly have the same structure, each including a spring and a columnar abutment. One end of the abutment abuts against the radial outer wall of the outer rotor, and the other end abuts against the spring. The other end of the spring abuts against the radial inner wall of the working cavity.

[0008] Furthermore, the inner wall surface of the hollow hole of the inner sleeve is recessed outward along the central axis of the first through hole and the second through hole to form an axially penetrating first mounting port and second mounting port, and the abutment is installed in the first mounting port and the second mounting port respectively.

[0009] Furthermore, the outer wall of the inner sleeve is provided with a third through hole that radially penetrates the hollow hole. The third through hole is located on the bisector of the area enclosed by the axes of the first through hole and the second through hole, and is located near the suction port side of the pump cover. A third partition component is provided on the third through hole.

[0010] Furthermore, the distance between the central axis K1 of the hollow hole of the inner sleeve and the central axis K2 of its radial outer circumference is greater than zero.

[0011] Furthermore, the radial outer wall surface of the inner sleeve is recessed to form an inner groove that communicates with the first through hole and the second through hole respectively, and its axial end face is sunken to form a guide port that communicates with the inner groove. In the axial projection of the cycloidal rotor pump, the projection of the guide port at least partially coincides with the projection of the outlet.

[0012] Furthermore, the bottom end face of the working chamber of the rotor cavity cover is recessed to form a suction groove and a discharge groove. In the axial projection of the cycloidal rotor pump, the projection of the suction groove at least partially coincides with the projection of the suction port, and the projection of the discharge groove at least partially coincides with the projection of the discharge port.

[0013] Furthermore, the cycloidal rotor pump also includes a positioning pin. The axial end face of the working chamber of the rotor cavity cover is recessed to form a positioning hole. The axial end face of the inner sleeve is provided with an axially penetrating notch or an inner sleeve positioning hole. The positioning pin passes through the notch or the inner sleeve positioning hole and is installed on the positioning hole.

[0014] Furthermore, the rotor cavity cover is recessed towards the axial end face of the pump cover to form an annular sealing groove, and a sealing ring is provided on the sealing groove.

[0015] Furthermore, the cycloidal rotor pump also includes a mounting block and a bearing. The rotor cavity cover has a raised annular mounting platform facing away from the pump cover. The axial end face of the mounting platform is recessed to form a mounting groove. The mounting block includes a columnar main body and a lug extending radially outward from the main body. The bearing is disposed in the hollow hole of the mounting platform. The mounting block is mounted on the mounting groove, and its lug is located on one side of the bearing's axial direction and restricts the bearing's axial movement.

[0016] The more specific design and technical effects of this utility model are further explained in conjunction with the accompanying drawings in the specific embodiments. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the cycloidal rotor pump of this utility model;

[0018] Figure 2 This is a partial sectional view of the cycloidal rotor pump of this utility model;

[0019] Figure 3 yes Figure 2 A magnified schematic diagram of the structure of part A in the diagram;

[0020] Figure 4 This is a radial sectional view of the cycloidal rotor pump of this utility model;

[0021] Figure 5 This is a three-dimensional structural diagram of the inner sleeve of this utility model;

[0022] Figure 6 This is a radial sectional view of the inner sleeve of this utility model;

[0023] Figure 7 This is a three-dimensional structural diagram of the pump cover of this utility model;

[0024] Figure 8 This is a three-dimensional structural schematic diagram of the rotor cavity cover of this utility model;

[0025] Figure 9 This is a three-dimensional structural diagram of the rotor cavity cover of this utility model from another direction;

[0026] Figure 10 This is a three-dimensional structural diagram of the mounting block of this utility model;

[0027] in:

[0028] 30-Working chamber, 60-Hollow hole, 90-Hollow hole, 100-Pump body, 200-Rotor, 300-Rotor cavity cover, 310-Suction groove, 320-Discharge groove, 330-Positioning hole, 340-Sealing groove, 350-Mounting platform, 351-Mounting groove, 400-Pump cover, 410-Inlet, 420-Outlet, 430-Suction port, 440-Discharge port, 510-Inner rotor, 520-Outer rotor, 530-Sealing ring, 600- Inner sleeve, 610-First through hole, 611-First mounting port, 620-Second through hole, 621-Second mounting port, 630-Third through hole, 640-Inner groove, 650-Flow guide port, 660-Notch, 710-First partition assembly, 711-Spring, 712-Abutting part, 720-Second partition assembly, 730-Third partition assembly, 800-Positioning pin, 910-Mounting block, 911-Main body, 912-Lug, 920-Bearing Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] See Figures 1 to 4 and Figures 6 to 8This utility model discloses a cycloidal rotor pump, including a pump body 100, a rotor 200 rotatably mounted on the pump body 100, a stator (not shown) fixed on the pump body 100, a rotor cavity cover 300 disposed on one axial side of the pump body 100, a pump cover 400 covering the rotor cavity cover 300, an inner rotor 510, an outer rotor 520, an inner sleeve 600, a first partition component 710, and a second partition component 720. The stator structure is the same as that of existing cycloidal rotor pumps and will not be described here. The main body of the rotor cavity cover 300 is a cylindrical body with a working cavity 30 axially arranged to accommodate the inner rotor 510 and the outer rotor 520. The pump cover 400 is provided with an inlet 410 for water intake and an outlet 420 for water discharge. The end face of the pump cover 400 facing the axial direction of the rotor cavity cover 300 is provided with a suction port 430 communicating with the inlet 410 and a discharge port 440 communicating with the outlet 420. The inner sleeve 600 is a cylindrical body with a through-hole axially arranged. The inner sleeve 600 has a hollow hole 60 and a first through hole 610 and a second through hole 620 that are respectively connected to the hollow hole 60. In this embodiment, the hollow hole 60 of the inner sleeve 600 is not concentric with the radial outer periphery of the inner sleeve 600. The central axis K1 of the hollow hole 60 is offset from the central axis K2 of the radial outer periphery of the inner sleeve 600 by a distance. Through this design, the tooth profiles of the inner rotor 510 and the outer rotor 520 can form a periodic change during the meshing process when the hollow hole 60 of the inner sleeve 600 moves, so as to realize the radial suction and discharge of liquid by the cycloidal rotor pump. After assembly, the cycloidal rotor pump of this utility model has an inner rotor 510 and an outer rotor 520 assembled in the working chamber 30. The inner sleeve 600 is installed in the working chamber 30 and is located radially between the inner wall surface of the working chamber 30 and the outer wall surface of the outer rotor 520. The first partition component 710 and the second partition component 720 are respectively installed in the first through hole 610 and the second through hole 620 and then radially abut against the radial outer wall surface of the outer rotor 520.

[0031] See Figure 4In the axial projection of the assembled cycloidal rotor pump, the outlet (see dashed line) 440 and the inlet (see dashed line) 430 of the pump cover 400 have counterclockwise circumferential endpoints S1 and S2, and S3 and S4, respectively. Rays from the center point S through the endpoints S1, S2, S3, and S4 of the pump cover 400 are L1, L2, L3, and L4 respectively, in a counterclockwise direction. Ray L2 and ray L3 form a first dividing region D1 in a counterclockwise direction, and ray L4 and ray L1 form a second dividing region D1 in a counterclockwise direction. In the partition region D2, the projection of the surface of the first partition component 710 that abuts against the outer wall surface of the outer rotor 520 at least partially falls in the first partition region D1, and the projection of the surface of the second partition component 720 that abuts against the outer wall surface of the outer rotor 520 at least partially falls in the second partition region D2; or the projection of the surface of the first partition component 710 that abuts against the outer wall surface of the outer rotor 520 at least partially falls in the second partition region D2, and the projection of the surface of the second partition component 720 that abuts against the outer wall surface of the outer rotor at least partially falls in the first partition region D1.

[0032] The cycloidal rotor pump of this utility model has an inner sleeve 600 provided with a first partition group 710 and a second partition assembly 720 that radially abut against the radial outer wall surface of the outer rotor 520. This design can ensure that there is a radial movement gap between the inner sleeve 600 and the outer rotor 520, while preventing the liquid from flowing back from the outlet (i.e., the high-pressure side) to the suction port (i.e., the low-pressure side) to reduce the flow loss during the operation of the cycloidal rotor pump and improve the working efficiency of the cycloidal rotor pump.

[0033] See Figure 3 and Figure 4In a preferred embodiment, the first through hole 610 and the second through hole 620 of the inner sleeve 600 are symmetrically arranged. With this design, the first separating component 710 and the second separating component 720, after being installed in the first through hole 610 and the second through hole 620, can symmetrically abut against the radial outer wall surface of the outer rotor 520, thereby reducing the impact between the outer rotor 520 and the inner sleeve 600 due to uneven force during rotation, and improving the stability of the cycloidal rotor pump. Furthermore, the first separating component 710 and the second separating component 720 of this invention have the same structure. The first separating component includes a spring 711 and a columnar abutment member 712; similarly, the second separating component includes a spring 711 and a columnar abutment member 712. During assembly, one end of the abutment member 712 abuts against the radial outer wall surface of the outer rotor 520, and the other end abuts against the spring 711. The other end of the spring 711 abuts against the radial inner wall surface of the working cavity of the rotor cavity cover 300. In a preferred embodiment, the abutment 712 is a cylindrical elastic plastic block. However, in other embodiments, the abutment 712 can be a component that abuts against the radial outer wall of the outer rotor 520 and blocks liquid flow. The cycloidal rotor pump designed as described above allows the abutment 712 to adaptively fit tightly against the outer wall of the outer rotor 520 during operation, ensuring smooth rotation of the cycloidal rotor pump while maintaining its working efficiency. See [link to relevant documentation]. Figure 4 , Figure 5 To allow the outer rotor 520 to adaptively correct its trajectory during movement, further reduce the impact between the outer rotor and the inner sleeve due to oscillation during rotation, and improve the service life of the cycloidal rotor pump, the inner sleeve 600 of this utility model is also provided with a third through hole 630 in the radial direction. The third through hole 630 is located on the bisector of the area enclosed by the axes of the first through hole 610 and the second through hole 620, and is located on the side near the suction port 430 of the pump cover. The third through hole 630 is provided with a third partition component 730 with the same structure as the first partition component 710.

[0034] Furthermore, see Figure 4 and Figure 5 In this invention, the radial wall surface of the hollow hole 60 of the inner sleeve 60 is recessed outward along the central axis of the first through hole 610 to form an axially penetrating first mounting opening 611, and the radial wall surface of the hollow hole 60 is recessed outward along the central axis of the second through hole 620 to form an axially penetrating second mounting opening 621. During installation, the abutment member 712 is respectively installed in the first mounting opening 611 and the second mounting opening 621. Preferably, the circumferential clearance between the abutment member 712 and the inner sleeve 600 is smaller than the radial movement clearance between the inner sleeve 600 and the outer rotor 520. This design facilitates the installation and disassembly of the abutment member 712, making maintenance of the cycloidal rotor pump easier.

[0035] Furthermore, see Figures 4 to 6The inner sleeve 600 of this invention has a radially concave inner groove 640 on its radially outer wall surface and an axially penetrating guide port 650. The inner groove 640 communicates with the first through hole 610, the second through hole 620, and the guide port 650. In the axial projection of the cycloidal rotor pump, the projection of the guide port 650 at least partially coincides with the projection of the discharge port 440. This design allows the liquid from the discharge port 440 to be guided through the guide port 650 and the inner groove 640 into the first through hole 610 and the second through hole 620, providing additional radial thrust to the two separating components located in the first through hole 610 and the second through hole 620 respectively. This prevents the separating components from being blown open and causing barrier failure in high-pressure operating environments, thus improving the operational stability of the cycloidal rotor pump.

[0036] Preferably, see Figure 4 and Figure 8 In this invention, the rotor chamber cover 300 is recessed towards the axial end face of the pump cover 400 to form an annular sealing groove 340. A sealing ring 530 is provided on the sealing groove 340 in the cycloidal rotor pump of this invention. This design effectively reduces liquid leakage during operation of the cycloidal rotor pump and improves its operational stability.

[0037] Preferably, the bottom end face of the working chamber 30 of the rotor cavity cover 30 of this invention is recessed to form a suction groove 310 and a discharge groove 320. In the axial projection of the cycloidal rotor pump, the projection of the suction groove 310 at least partially coincides with the projection of the suction port 430, and the projection of the discharge groove 320 at least partially coincides with the projection of the discharge port 440. This design allows liquid to be stored in the suction groove 310 and the discharge groove 320 to provide lubrication for the inner rotor 510 and the outer rotor 520, reducing dry friction damage between the rotor cavity cover 300 and the inner rotor 510 and the outer rotor 520, and improving the service life of the cycloidal rotor pump.

[0038] See Figure 4 , Figure 5 and Figure 8 The cycloidal rotor pump of this invention also includes a positioning pin 800. The bottom end face of the working cavity 30 of the rotor chamber cover 300 is recessed to form a positioning hole 330. The axial end face of the inner sleeve 600 has an axially penetrating notch 660. Alternatively, in other embodiments, the axial end face of the inner sleeve 600 can also have an axially penetrating inner sleeve positioning hole. During assembly, the positioning pin 800 passes through the notch 660 (or the inner sleeve positioning hole) and is installed on the positioning hole 330. This design prevents low efficiency or malfunction due to inaccurate installation positions of the inner sleeve 600 and the rotor chamber cover 300, thus improving the pass rate of cycloidal rotor pump production.

[0039] See Figure 3 , Figure 9 and Figure 10The cycloidal rotor pump of this invention also includes a mounting block 910 and a bearing 920. The rotor chamber cover 300 has a columnar mounting platform 350 protruding from the side facing away from the pump cover 400. The axial end face of the mounting platform 350 is recessed to form a mounting groove 351. The mounting block 910 includes a columnar main body 911 and a lug 912 extending radially outward from the main body. During assembly, the bearing 920 is placed inside the hollow hole 90 of the mounting platform, and the mounting block 910 is mounted on the mounting groove 351. The lug 912 is located axially on the bearing 920, and the axial projection of the lug 912 at least partially overlaps with the axial projection of the bearing 920. This design facilitates radial disassembly and replacement of parts located within the hollow hole of the mounting platform.

[0040] The working principle of the cycloidal rotor pump of this invention can be found in [reference needed]. Figure 2 and Figure 4 Liquid enters from the inlet 410 of the pump cover 400, passes through the suction inlet 430, and then enters the hollow hole 60 of the inner sleeve 600. The rotation of the inner rotor 510 and the outer rotor 520 drives the liquid to flow towards the outlet 440. Most of the liquid flowing to the outlet 440 is discharged through the outlet 420 of the pump cover 400. A small portion of the liquid flowing to the outlet 400 flows through the guide port 650 and the inner groove 640 to the first through hole 710 and the second through hole 720, pushing the abutment member 712 so that the abutment member 712 is tightly attached to the outer rotor 520. This reduces the backflow of liquid from the radial gap between the outer rotor 520 and the working chamber wall of the rotor cavity cover 300 to near the suction inlet 430, thus reducing flow loss. The working efficiency of the cycloidal rotor pump designed in this utility model is improved.

Claims

1. A cycloidal rotor pump, comprising a pump body (100), a rotor (200), a stator, a rotor chamber cover (300) disposed on one axial side of the pump body, a pump cover (400) covering the rotor chamber cover, an inner rotor (510) and an outer rotor (520) housed in a working chamber (30) of the rotor chamber cover (300), wherein the pump cover (400) is provided with an inlet (410) and an outlet (420), and on the axial side facing the rotor chamber cover (300) is provided an inlet (430) communicating with the inlet and an outlet (440) communicating with the outlet, characterized in that: It also includes an annular inner sleeve (600) disposed in the working chamber (30) and located between the inner wall surface of the working chamber and the outer wall surface of the outer rotor. The inner sleeve (600) is provided with an axially penetrating hollow hole (60) for the outer rotor (520) to be fitted and installed. The outer wall surface of the inner sleeve (600) is provided with a first through hole (610) and a second through hole (620) that radially penetrate the hollow hole (60). The first through hole (610) and the second through hole (620) are respectively provided with a first partition component (710) and a second partition component (720) that radially abut against the radial outer wall surface of the outer rotor (520). In the axial projection of the cycloidal rotor pump, the circumferential endpoints of the outlet (440) and the inlet (430) along the counterclockwise direction are S1 and S2, and S3 and S4, respectively. Starting from the center point S of the pump cover, passing through the endpoints S1 and S2, the pump is connected to the outer rotor.

2. The rays S3 and S4 are L1, L2, L3, and L4 in a counterclockwise direction. Ray L2 and ray L3 form a first dividing region D1 in a counterclockwise direction, and ray L4 and ray L1 form a second dividing region D2 in a counterclockwise direction. The projection of the surface of the first dividing component (710) that abuts against the outer wall of the outer rotor (520) falls at least partially in the first dividing region D1, and the projection of the surface of the second dividing component (720) that abuts against the outer wall of the outer rotor (520) falls at least partially in the second dividing region D2; or, the projection of the surface of the first dividing component (710) that abuts against the outer wall of the outer rotor (520) falls at least partially in the second dividing region D2, and the projection of the surface of the second dividing component (720) that abuts against the outer wall of the outer rotor (520) falls at least partially in the first dividing region D1.

2. The cycloidal rotor pump according to claim 1, characterized in that: The first through hole (610) and the second through hole (620) are arranged symmetrically.

3. The cycloidal rotor pump according to claim 1 or 2, characterized in that: The first separating component (710) and the second separating component (720) have the same structure, each including a spring (711) and a columnar abutment (712). One end of the abutment (712) abuts against the radial outer wall of the outer rotor (520), and the other end abuts against the spring (711). The other end of the spring (711) abuts against the radial inner wall of the working cavity (30).

4. The cycloidal rotor pump according to claim 3, characterized in that: The inner wall surface of the hollow hole (60) of the inner sleeve (600) is recessed outward along the central axis of the first through hole and the second through hole to form an axially penetrating first mounting port (611) and second mounting port (621), and the abutment (712) is installed in the first mounting port (611) and the second mounting port (621), respectively.

5. The cycloidal rotor pump according to claim 3, characterized in that: The outer wall of the inner sleeve (600) is also provided with a third through hole (630) that radially penetrates the hollow hole (60). The third through hole (630) is located on the bisector of the area enclosed by the axes of the first through hole (610) and the second through hole (620), and is located on the side near the suction port (430) of the pump cover. A third partition component (730) is provided on the third through hole (630).

6. The cycloidal rotor pump according to claim 1, characterized in that: The distance between the central axis K1 of the hollow hole (60) of the inner sleeve (600) and the central axis K2 of its radial outer circumference is greater than zero.

7. The cycloidal rotor pump according to claim 1, characterized in that: The radial outer wall of the inner sleeve (600) is recessed to form an inner groove (640) that communicates with the first through hole (610) and the second through hole (620) respectively. Its axial end face is sunken to form a guide port (650) that communicates with the inner groove (640). In the axial projection of the cycloidal rotor pump, the projection of the guide port (650) at least partially coincides with the projection of the discharge port (440).

8. The cycloidal rotor pump according to claim 1 or 7, characterized in that: The bottom end face of the working chamber (30) of the rotor chamber cover (300) is recessed to form a suction groove (310) and a discharge groove (320). In the axial projection of the cycloidal rotor pump, the projection of the suction groove (310) at least partially coincides with the projection of the suction port (430), and the projection of the discharge groove (320) at least partially coincides with the projection of the discharge port (440).

9. The cycloidal rotor pump according to claim 1, characterized in that: It also includes a positioning pin (800). The axial end face of the working cavity (30) of the rotor cavity cover (300) is recessed to form a positioning hole (330). The axial end face of the inner sleeve (600) is provided with an axially penetrating notch (660) or an inner sleeve positioning hole. The positioning pin (800) passes through the notch (660) or the inner sleeve positioning hole and is installed on the positioning hole (330).

10. The cycloidal rotor pump according to claim 1, characterized in that: The rotor cavity cover (300) is recessed towards the axial end face of the pump cover to form an annular sealing groove (340), and a sealing ring (530) is provided on the sealing groove (340).

11. The cycloidal rotor pump according to claim 1, characterized in that: It also includes a mounting block (910) and a bearing (920). The rotor cavity cover (300) has a raised annular mounting platform (350) on the side opposite to the pump cover (400). The axial end face of the mounting platform (350) is recessed to form a mounting groove (351). The mounting block (910) includes a columnar main body (911) and a lug (912) extending radially outward from the main body. The bearing (920) is disposed in the hollow hole (90) of the mounting platform. The mounting block (910) is mounted on the mounting groove (351). Its lug (912) is located on one side of the bearing (920) in the axial direction and restricts the axial movement of the bearing.

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