A mouth ring assembly and water pump

Abstract

The application relates to a mouth ring assembly and a water pump. The water pump comprises a pump body, an impeller assembly and the mouth ring assembly. The mouth ring assembly is arranged in the gap between the outlet of the water suction chamber of the pump body and the inlet of the impeller chamber. The mouth ring assembly comprises a blocking ring, a limiting ring, a first floating mouth ring and a second floating mouth ring. The limiting ring is fixedly installed on the blocking ring to form a floating cavity for the first floating part. The first floating mouth ring comprises a first floating part and a first sealing ring. The second floating mouth ring comprises a second floating part and a second sealing ring. The second floating part is movably arranged on the limiting ring. The first sealing ring and the second sealing ring form a sealing ring area. The impeller convex ring is arranged in the sealing ring area. By arranging the floating mouth rings on both sides of the impeller convex ring, the double-side floating sealing is realized. The first floating mouth ring and the second floating mouth ring are independent of each other, the sealing effect is better, the backflow leakage is reduced, the water output of the water pump is increased, the volumetric efficiency of the water pump is improved, and the overall energy consumption of the water pump is reduced.

Description

Technical Field

[0001] This invention relates to the field of water pump technology, and in particular to a mouth ring assembly and a water pump. Background Technology

[0002] A water pump includes a pump body, which has a suction chamber and an impeller chamber on which an impeller is installed. There is a certain gap between the outlet of the suction chamber and the inlet of the impeller chamber. If this gap is too large, the high-pressure water flowing out of the impeller will flow back to the inlet of the impeller through this gap. That is, water leaks from the high-pressure area to the low-pressure area, reducing the pump's output, reducing the pump's volumetric efficiency, and increasing the overall energy consumption of the water pump.

[0003] In existing technology, to prevent liquid backflow during pump operation, a floating ring is added to the impeller. The floating ring relies on its own weight to fit tightly against the outer surface of the impeller inlet. When the pump is working, the floating ring contacts and seals the point on the impeller with the largest radial runout, resulting in a better sealing effect than a conventional ring. However, the contact point between the floating ring and the outer surface of the impeller inlet is singular, making it difficult to meet users' energy-saving requirements for the pump.

[0004] Therefore, there is an urgent need for a mouth ring assembly and a water pump to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a mouth ring assembly to at least solve one of the above-mentioned problems.

[0006] To achieve the above objectives, the present invention provides an oral ring assembly, comprising:

[0007] retaining ring;

[0008] A limiting ring is fixedly mounted on the retaining ring and forms a floating cavity;

[0009] The first floating ring includes a first floating part and a first sealing ring. The first sealing ring protrudes from the first floating part along the axial direction of the retaining ring. The first floating part is movably disposed in the floating cavity. The first sealing ring passes through the retaining ring.

[0010] The second floating ring includes a second floating part and a second sealing ring. The second sealing ring protrudes from the second floating part along the axial direction of the retaining ring. The second floating part is movably disposed on the limiting ring. The second sealing ring passes through the limiting ring, the first floating part and the retaining ring in sequence, and is located inside the first sealing ring. A sealing ring area is formed between the first sealing ring and the second sealing ring.

[0011] Furthermore, the limiting ring has a limiting protrusion on the side facing the first floating ring, and the first floating part has an anti-rotation groove, with the limiting protrusion movably disposed within the anti-rotation groove.

[0012] Furthermore, floating spaces are provided between the anti-rotation groove and the limiting protrusion along both the circumferential and radial directions of the retaining ring.

[0013] Furthermore, the axial distance between the limiting protrusion and the retaining ring is less than the axial dimension of the anti-rotation groove.

[0014] Furthermore, the limiting protrusion abuts axially against the retaining ring.

[0015] Furthermore, the second floating part includes a floating ring and an anti-rotation part. Along the radial direction of the retaining ring, the anti-rotation part protrudes from the floating ring. A limiting groove is formed on the side of the limiting ring facing the second floating part, and the anti-rotation part is movably disposed in the limiting groove.

[0016] Furthermore, along the axial direction of the retaining ring, the limiting protrusion and the limiting groove are positioned opposite each other.

[0017] Furthermore, there are multiple anti-rotation grooves, which are evenly distributed along the circumference of the first floating part, and each anti-rotation groove corresponds to a limiting protrusion.

[0018] The purpose of this invention is to provide a water pump that at least solves one of the above-mentioned problems.

[0019] To achieve the above objectives, the present invention provides a water pump, comprising:

[0020] The pump body has a suction chamber and an impeller chamber, and there is a gap between the outlet of the suction chamber and the inlet of the impeller chamber;

[0021] As described in any of the above embodiments, the retaining ring is fixedly disposed in the gap;

[0022] An impeller assembly is disposed in the impeller chamber. The impeller assembly includes an impeller front cover plate, and the impeller front cover plate includes an impeller convex ring. The impeller convex ring is disposed in the sealing ring area. The impeller convex ring has an inner mating surface and an outer mating surface that are concentrically arranged. The outer mating surface can float and seal with the inner wall of the first sealing ring, and the inner mating surface can float and seal with the outer wall of the second sealing ring.

[0023] Furthermore, along the axial direction of the retaining ring, the mouth ring assembly has a through-hole, which is connected to the outlet of the water suction chamber and the inlet of the impeller chamber, respectively.

[0024] The beneficial effects of this invention are as follows:

[0025] The water pump provided by the present invention includes a pump body, an impeller assembly, and a mouth ring assembly. The pump body has a suction chamber and an impeller chamber. There is a gap between the outlet of the suction chamber and the inlet of the impeller chamber. The impeller assembly is disposed in the impeller chamber, and the mouth ring assembly is disposed in the gap. The mouth ring assembly includes a retaining ring, a limiting ring, a first floating mouth ring, and a second floating mouth ring. The first floating mouth ring includes a first floating part and a first sealing ring. The first sealing ring protrudes from the first floating part along the axial direction of the retaining ring. The limiting ring is fixedly installed on the retaining ring to form a floating cavity for the first floating part to move. The first sealing ring passes through the retaining ring. The second floating mouth ring includes a second floating part and a second sealing ring. The second sealing ring protrudes from the second floating part along the axial direction of the retaining ring. The second floating part is movably disposed on the limiting ring. The second sealing ring passes through the limiting ring, the first floating part, and the retaining ring, and is located inside the first sealing ring. A sealing ring area is formed between the first sealing ring and the second sealing ring. The impeller assembly includes an impeller front cover plate. The impeller front cover plate includes an impeller convex ring. The impeller convex ring is disposed within the sealing ring area. The impeller convex ring has an inner mating surface and an outer mating surface that are concentrically arranged. The inner mating surface can float and seal with the outer wall of the second sealing ring, and the outer mating surface can float and seal with the inner wall of the first sealing ring. By setting floating rings on both sides of the impeller convex ring, the space on both sides of the impeller convex ring can be utilized simultaneously to achieve double-sided floating seal. The first floating ring and the second floating ring do not affect each other and are independent of each other, resulting in a better sealing effect. This reduces the amount of high-pressure water flowing out of the impeller and returning to the impeller inlet through the gap, increases the water output of the pump, improves the volumetric efficiency of the pump, and reduces the overall energy consumption of the pump. Attached Figure Description

[0026] Figure 1 This is an exploded view of the mouth ring assembly provided in an embodiment of the present invention from a first angle;

[0027] Figure 2 This is an exploded view of the mouth ring assembly provided in an embodiment of the present invention from a second angle;

[0028] Figure 3 This is a schematic diagram of the mouth ring assembly provided in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the mouth ring assembly provided in another embodiment of the present invention from another angle;

[0030] Figure 5 This is a cross-sectional view of the mouth ring assembly provided in an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the impeller assembly provided in an embodiment of the present invention;

[0032] Figure 7 A schematic diagram of the assembled mouth ring assembly and impeller assembly provided in this embodiment of the invention;

[0033] Figure 8 This is a schematic diagram of the assembly of the mouth ring assembly and the impeller assembly provided in an embodiment of the present invention from another angle;

[0034] Figure 9 This is a cross-sectional view of the assembled mouth ring assembly and impeller assembly provided in an embodiment of the present invention;

[0035] Figure 10 This is a schematic diagram of the structure of the water pump provided in an embodiment of the present invention;

[0036] Figure 11 This is a schematic diagram of the water pump provided in another embodiment of the present invention;

[0037] Figure 12 This is a cross-sectional view of the water pump provided in an embodiment of the present invention;

[0038] Figure 13 yes Figure 12 A magnified view of a portion of point A in the middle.

[0039] In the picture:

[0040] 100. Mouth ring assembly;

[0041] 1. Retaining ring; 11. First through hole;

[0042] 2. Limiting ring; 21. Limiting protrusion; 22. Limiting groove; 23. Second through hole;

[0043] 3. Floating cavity;

[0044] 4. First floating ring; 41. First floating part; 411. Anti-rotation groove; 42. First sealing ring; 43. Third through hole;

[0045] 5. Second floating ring; 51. Second floating part; 511. Floating ring; 512. Anti-rotation part; 52. Second sealing ring; 53. Fourth through hole;

[0046] 6. Sealing ring area;

[0047] 7. Ring entrance;

[0048] 200. Impeller assembly; 201. Impeller front cover plate; 202. Impeller convex ring; 2021. Inner mating surface; 2022. Outer mating surface;

[0049] 300. Pump body; 301. Suction chamber; 302. Impeller chamber; 303. Clearance; 304. Discharge chamber; 305. High-pressure zone; 306. Low-pressure zone. Detailed Implementation

[0050] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings, not all of them.

[0051] This invention defines certain directional terms. Unless otherwise stated, the directional terms used, such as "up," "down," "left," "right," "inner," and "outer," are used for ease of understanding and therefore do not constitute a limitation on the scope of protection of this invention.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0053] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0054] like Figures 1-5 As shown, this embodiment provides a mouth ring assembly 100, which is applied in a water pump to reduce the backflow of water from the impeller outlet to the impeller inlet, increase the water output of the water pump, improve the volumetric efficiency of the water pump, and reduce the overall energy consumption of the water pump.

[0055] The mouth ring assembly 100 includes a retaining ring 1, a limiting ring 2, a first floating mouth ring 4, and a second floating mouth ring 5. The limiting ring 2 is fixedly disposed on the retaining ring 1 and forms a floating cavity 3. The first floating mouth ring 4 includes a first floating part 41 and a first sealing ring 42. The first sealing ring 42 protrudes from the first floating part 41 along the axial direction of the retaining ring 1. The second floating mouth ring 5 includes a second floating part 51 and a second sealing ring 52. The second sealing ring 52 protrudes from the second floating part 51 along the axial direction of the retaining ring 1. The first floating part 41 is movably disposed in the floating cavity 3, and the second floating part 51 is movably disposed on the limiting ring 2. The first sealing ring 42 passes through the retaining ring 1, and the second sealing ring 52 passes through the limiting ring 2, the first floating part 41, and the retaining ring 1 in sequence, and is located inside the first sealing ring 42. A sealing ring area 6 is formed between the first sealing ring 42 and the second sealing ring 52. The sealing ring area 6 is used to provide space for the floating seal between the mouth ring assembly 100 and the impeller front cover plate 201 in the water pump. By setting floating rings on both the inner and outer sides of the impeller front cover plate 201, the space on both the inner and outer sides of the impeller front cover plate 201 can be utilized simultaneously to achieve double-sided floating sealing. Moreover, the first floating ring 4 and the second floating ring 5 do not affect each other and are independent of each other, resulting in better sealing effect, increased water output of the water pump, improved volumetric efficiency of the water pump, and reduced overall energy consumption of the water pump.

[0056] When the impeller rotates, if the floating ring adheres to the impeller, it will rotate synchronously with the impeller under the action of friction. However, when the friction between the floating ring and the impeller is insufficient to support the floating ring's synchronous rotation with the impeller, their rotations become asynchronous, and the floating ring's rotational speed drops below that of the impeller. Relative motion occurs between them, and the contact points between the floating ring and the impeller will wear against each other under the action of friction. Therefore, in this embodiment, both the first floating part 41 and the second floating part 51 are stopped from rotating by the limiting ring 2. This stoppage means that both the first floating part 41 and the second floating part 51 can float slightly in the circumferential direction, but they will not rotate synchronously with the impeller; that is, there is a slight relative rotation between the first floating part 41, the second floating part 51, and the impeller in the circumferential direction. When the impeller rotates, the first floating ring 4 and the second floating ring 5 are restricted by the limiting ring 2 and will not stick to the impeller. That is, the first floating ring 4 and the second floating ring 5 will not rotate synchronously with the impeller, nor will they wear each other due to a difference in rotational speed caused by insufficient subsequent friction. The impeller rotates between the two floating rings, that is, the impeller rotates within the sealing ring area 6. This prevents water backflow when the floating rings are severely worn, and at the same time prevents the impeller performance from deteriorating when the impeller is severely worn, thus extending the service life of the floating rings and the impeller.

[0057] In this embodiment, the axial direction refers to the axial direction of the retaining ring 1, the circumferential direction refers to the circumferential direction of the retaining ring 1, and the radial direction refers to the radial direction of the retaining ring 1.

[0058] The first floating part 41 is movably disposed within the floating cavity 3, meaning that the first floating part 41 can float axially, radially, and circumferentially within the floating cavity 3. Similarly, the second floating part 51 is movably disposed on the limiting ring 2, meaning that the second floating part 51 can float axially, radially, and circumferentially on the limiting ring 2. The floating design of the first floating part 41 and the second floating part 51 is to accommodate the rotation of the impeller caused by the pump shaft's movement. If the impeller rotates due to the pump shaft's movement and the floating ring does not float with the impeller, it will cause friction between the impeller and the floating ring. This friction will cause wear on both the impeller and the floating ring, thus affecting the impeller speed. A decrease in impeller speed will reduce pump efficiency, and severe friction can lead to impeller jamming, motor overload, and burnout.

[0059] The wear ring assembly 100 provided in this embodiment, while minimizing the number of parts, has a floating wear ring on each of the two sides of the limiting ring 2 along the axial direction. The limiting ring 2 and the retaining ring 1 cooperate to provide floating space for the two floating wear rings, and the two floating spaces also ensure that the two floating wear rings do not affect each other and are independent of each other. The setting of two floating wear rings ensures that the impeller, in the same state, has floating wear rings in contact with both the inner and outer sides of the impeller, forming two sealing points, resulting in better sealing effect and reducing the backflow leakage of the water pump.

[0060] The mouth ring assembly 100 provided in this embodiment also maintains the original axial space, realizing the axial floating of the two floating mouth rings within a limited space, and has a high space utilization rate.

[0061] The ring assembly 100 provided in this embodiment increases the number of floating rings without increasing axial space. In other words, the added floating rings are not simply superimposed axially; rather, the ring assembly 100 is a rationally designed structure within a limited space to achieve the increased number of floating rings. This increased number of floating rings ensures that, under the same conditions, both the inner and outer sides of the impeller are in contact with floating rings, forming two sealing points. This results in better sealing and reduces backflow leakage in the pump.

[0062] Furthermore, the limiting ring 2 and the retaining ring 1 are interference-fitted.

[0063] Furthermore, a limiting protrusion 21 is provided on the side of the limiting ring 2 facing the first floating ring 4, and an anti-rotation groove 411 is provided on the first floating part 41, with the limiting protrusion 21 movably disposed within the anti-rotation groove 411. The arrangement of the anti-rotation groove 411 and the limiting protrusion 21 prevents the first floating ring 4 from rotating with the impeller at a large angle, but allows it to float circumferentially within the groove of the anti-rotation groove 411.

[0064] Furthermore, floating spaces are provided between the anti-rotation groove 411 and the limiting protrusion 21 along both the circumferential and radial directions of the retaining ring 1. This arrangement allows the first floating ring 4 to be constrained by the limiting protrusion 21 within the floating cavity 3 and thus not to move freely. In other words, the first floating ring 4 can float slightly circumferentially and radially within the floating cavity 3 to adapt to the impeller's jumping rotation and reduce wear between the first floating ring 4 and the impeller.

[0065] Furthermore, the axial distance between the limiting protrusion 21 and the retaining ring 1 is less than the axial dimension of the anti-rotation groove 411. This arrangement ensures that the limiting protrusion 21 will not disengage from the anti-rotation groove 411.

[0066] Preferably, the limiting protrusion 21 abuts axially against the retaining ring 1, so that the retaining ring 1 and the limiting ring 2 are seamless in the axial direction, ensuring that the anti-rotation groove 411 will not detach from the limiting protrusion 21.

[0067] Furthermore, there are multiple anti-rotation grooves 411, which are evenly distributed along the circumference of the first floating part 41, and the anti-rotation grooves 411 are corresponding to the limiting protrusions 21 one by one.

[0068] Furthermore, the second floating part 51 includes a floating ring 511 and an anti-rotation part 512. Along the radial direction of the retaining ring 1, the anti-rotation part 512 protrudes from the floating ring 511. A limiting groove 22 is formed on the side of the limiting ring 2 facing the second floating part 51, and the anti-rotation part 512 is movably disposed within the limiting groove 22. The arrangement of the anti-rotation part 512 and the limiting groove 22 prevents the second floating ring 5 from rotating with the impeller at large angles, but allows it to float circumferentially within the limiting groove 22.

[0069] Furthermore, floating spaces are provided between the anti-rotation part 512 and the limiting groove 22 along both the circumferential and radial directions of the retaining ring 1. This arrangement allows the second floating inlet ring 5 to be constrained by the limiting groove 22 on the limiting ring 2 and thus not to move freely. In other words, the second floating inlet ring 5 can float slightly circumferentially and radially on the limiting ring 2 to adapt to the impeller's jumping rotation and reduce wear between the second floating inlet ring 5 and the impeller.

[0070] Furthermore, the axial dimension of the limiting groove 22 is larger than the axial dimension of the anti-rotation part 512. This arrangement ensures that the second floating ring 5 floats axially.

[0071] Furthermore, there are multiple anti-rotation parts 512, which are evenly distributed on the floating ring 511 along the circumference of the retaining ring 1, and the anti-rotation parts 512 are correspondingly arranged with the limiting grooves 22.

[0072] Preferably, along the axial direction of the retaining ring 1, the limiting protrusion 21 and the limiting groove 22 are arranged opposite each other, and the number of limiting protrusions 21 and limiting grooves 22 is the same, that is, the limiting groove 22 is recessed and simultaneously forms the limiting protrusion 21. This arrangement allows the retaining ring 2 to be thinner while ensuring strength, saving space and ensuring that the axial space of the retaining ring assembly 100 remains unchanged compared with the prior art.

[0073] It should be noted that the mouth ring assembly 100 provided in this embodiment can reduce the amount of water pump backflow leakage, rather than completely prevent leakage.

[0074] like Figures 6-13 As shown, this embodiment also provides a water pump, which includes a pump body 300, an impeller assembly 200 and the aforementioned mouth ring assembly 100. The pump body 300 has a suction chamber 301 and an impeller chamber 302. There is a gap 303 between the outlet of the suction chamber 301 and the inlet of the impeller chamber 302. The impeller assembly 200 is disposed in the impeller chamber 302, and the mouth ring assembly 100 is disposed in the gap 303.

[0075] The impeller assembly 200 includes an impeller front cover plate 201, which includes an impeller convex ring 202. The impeller convex ring 202 is located within the sealing ring area 6. The impeller convex ring 202 has a concentrically arranged inner mating surface 2021 and an outer mating surface 2022. The inner mating surface 2021 can float and seal with the outer wall of the second sealing ring 52, and the outer mating surface 2022 can float and seal with the inner wall of the first sealing ring 42. By setting floating rings on both sides of the impeller convex ring 202, the space on both sides of the impeller convex ring 202 can be utilized simultaneously to achieve double-sided floating sealing. Moreover, the first floating ring 4 and the second floating ring 5 do not affect each other and are independent of each other, resulting in better sealing effect. This reduces the amount of high-pressure water flowing out of the impeller and returning to the impeller inlet through the gap 303, increases the water output of the pump, improves the volumetric efficiency of the pump, and reduces the overall energy consumption of the pump.

[0076] Furthermore, when the mouth ring assembly 100 is installed on the gap 303, the retaining ring 1 is fixedly installed on the side wall of the gap 303, specifically on the side wall of the stop of the gap 303.

[0077] Furthermore, the retaining ring 1 and the side wall of the stop of the clearance 303 are interference fit.

[0078] When the mouth ring assembly 100 is installed on the gap 303, the side of the limiting ring 2 with the limiting groove 22 faces the stop on the gap 303. The retaining ring 1 is interference-fitted with the stop, and the wall of the stop fits against the limiting ring 2, thereby ensuring that the second floating mouth ring 5 will not come out of the limiting groove 22.

[0079] Furthermore, the pump body 300 is provided with an outlet chamber 304, the inlet of which is connected to the outlet of the impeller chamber 302.

[0080] Furthermore, the retaining ring 1 has a first through hole 11, the limiting ring 2 has a second through hole 23, the first floating part 41 has a third through hole 43, and the second floating part 51 has a fourth through hole 53. When the mouth ring assembly 100 is assembled together, the first through hole 11, the second through hole 23, the third through hole 43 and the fourth through hole 53 are arranged opposite each other to form a through ring 7. The ring 7 is connected to the outlet of the suction chamber 301 and the inlet of the impeller chamber 302, respectively, so that water can be drawn into the pump body 300 from the suction chamber 301 and then enter the impeller of the impeller chamber 302 through the ring 7.

[0081] The first sealing ring 42 passes through the first through hole 11, and the second sealing ring 52 passes through the second through hole 23, the third through hole 43 and the first through hole 11 in sequence.

[0082] Because the impeller has a pressurizing function, a high-pressure zone 305 is formed at the outlet of the impeller chamber 302, and a low-pressure zone 306 is formed at the inlet of the impeller chamber 302. The mouth ring assembly 100 is set in the gap 303 to reduce the backflow of water from the high-pressure zone 305 to the low-pressure zone 306, thereby increasing the water output of the pump, improving the volumetric efficiency of the pump, and reducing the overall energy consumption of the pump.

[0083] Although the present invention has been described in detail above with general descriptions, specific embodiments, and experiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A mouth ring assembly, characterized in that, include: retaining ring (1); A limiting ring (2) is fixedly disposed on the retaining ring (1) and forms a floating cavity (3); The first floating port ring (4) includes a first floating part (41) and a first sealing ring (42). The first sealing ring (42) protrudes from the first floating part (41) along the axial direction of the retaining ring (1). The first floating part (41) is movably disposed in the floating cavity (3). The first sealing ring (42) passes through the retaining ring (1). The second floating port ring (5) includes a second floating part (51) and a second sealing ring (52). The second sealing ring (52) protrudes from the second floating part (51) along the axial direction of the retaining ring (1). The second floating part (51) is movably disposed on the limiting ring (2). The second sealing ring (52) passes through the limiting ring (2), the first floating part (41) and the retaining ring (1) in sequence, and is located inside the first sealing ring (42). A sealing ring area (6) is formed between the first sealing ring (42) and the second sealing ring (52).

2. The mouth ring assembly according to claim 1, characterized in that, The limiting ring (2) has a limiting protrusion (21) on the side facing the first floating ring (4), and the first floating part (41) has an anti-rotation groove (411), and the limiting protrusion (21) is movably disposed in the anti-rotation groove (411).

3. The mouth ring assembly according to claim 2, characterized in that, Along the circumferential and radial directions of the retaining ring (1), there is a floating space between the anti-rotation groove (411) and the limiting protrusion (21).

4. The mouth ring assembly according to claim 2, characterized in that, The axial distance between the limiting protrusion (21) and the retaining ring (1) is less than the axial dimension of the anti-rotation groove (411).

5. The mouth ring assembly according to claim 4, characterized in that, The limiting protrusion (21) abuts axially against the retaining ring (1).

6. The mouth ring assembly according to claim 2, characterized in that, The second floating part (51) includes a floating ring (511) and an anti-rotation part (512). Along the radial direction of the retaining ring (1), the anti-rotation part (512) protrudes from the floating ring (511). The limiting ring (2) has a limiting groove (22) on one side facing the second floating part (51), and the anti-rotation part (512) is movably disposed in the limiting groove (22).

7. The mouth ring assembly according to claim 6, characterized in that, Along the axial direction of the retaining ring (1), the limiting protrusion (21) and the limiting groove (22) are arranged opposite each other.

8. The mouth ring assembly according to claim 2, characterized in that, The number of anti-rotation grooves (411) is multiple, and the multiple anti-rotation grooves (411) are evenly distributed along the circumference of the first floating part (41). The anti-rotation grooves (411) are corresponding to the limiting protrusions (21) one by one.

9. A water pump, characterized in that, include: The pump body (300) has a suction chamber (301) and an impeller chamber (302), and there is a gap (303) between the outlet of the suction chamber (301) and the inlet of the impeller chamber (302); The mouth ring assembly (100) as described in any one of claims 1-8, wherein the retaining ring (1) is fixedly disposed in the gap (303); An impeller assembly (200) is disposed within the impeller chamber (302). The impeller assembly (200) includes an impeller front cover plate (201), which includes an impeller convex ring (202). The impeller convex ring (202) is disposed within the sealing ring area (6). The impeller convex ring (202) has an inner mating surface (2021) and an outer mating surface (2022) that are concentrically arranged. The outer mating surface (2022) floats and seals with the inner wall of the first sealing ring (42), and the inner mating surface (2021) floats and seals with the outer wall of the second sealing ring (52).

10. The water pump according to claim 9, characterized in that, Along the axial direction of the retaining ring (1), the mouth ring assembly (100) has a through annular opening (7), which is connected to the outlet of the water suction chamber (301) and the inlet of the impeller chamber (302).

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