Centrifugal pump floating wear ring assembly and guiding type sealing structure thereof

Abstract

The invention discloses a centrifugal pump floating opening ring assembly and a guiding type sealing structure thereof, and belongs to the field of pump units. The wear ring assembly comprises a wear ring pressing plate, a positioning convex lug is arranged on the wear ring pressing plate, and the positioning convex lug and a positioning groove in a floating wear ring are clamped and positioned; a mounting plane is formed on the side, facing the floating wear ring, of the wear ring pressing plate and is in contact positioning with the inner wall of the pump body; the side, away from the floating wear ring, of the wear ring pressing plate extends to form a turnup part, and the turnup part is in interference fit with the inner wall of the pump body. The floating wear ring and the wear ring pressing plate are combined for positioning, and radial and axial floating of the floating wear ring is effectively guided and limited through matching of the positioning convex lugs and the positioning grooves; pre-positioning is achieved through contact between the mounting plane and the inner wall of the pump body, press-fitting fixing is achieved through interference fit between the flanging part and the inner wall of the pump body, the assembly process is simple and reliable, and the impeller ring positioning and assembly precision can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal pump sealing, and more particularly to a centrifugal pump floating port ring assembly and a guided sealing structure thereof. Background Art

[0002] Centrifugal pumps, core equipment in the fluid transportation field, consist of key components such as the impeller, pump body, and shaft assembly. The mouth ring (also known as the seal ring / wear ring) is a precision-fitted pair installed between the impeller inlet and the pump casing. It primarily performs three functions: 1. Sealing: A 0.1-0.5mm clearance design reduces backflow of media from high-pressure areas to low-pressure areas. Data shows that mouth ring leakage can account for 5%-15% of the total pump flow. Properly controlling the clearance is crucial to ensuring centrifugal pump efficiency. 2. Wear protection: As a replaceable component, it withstands friction and wear between the impeller and the pump body, preventing direct damage to core components. 3. Vibration suppression: A properly designed clearance reduces fluid excitation forces and reduces noise.

[0003] For single-stage pumps, the industry currently mostly uses a fixed ring design. This structure does not require high manufacturing and assembly requirements. Due to the influence of manufacturing process precision, the gap between the impeller and the ring is generally controlled at 0.3mm, or even above 0.5mm. Otherwise, friction is easily generated between the impeller and the ring, generating noise and excessive motor power consumption. Therefore, the function of improving efficiency is limited. In addition, the cold assembly gap of the fixed ring cannot compensate for the thermal expansion difference caused by conveying high-temperature media. To further improve the hydraulic efficiency of the pump body, the adjustable floating ring design has been more widely used.

[0004] Floating rings allow for a certain degree of floatation, compensating for thermal expansion, vibration, and displacement to a certain extent, thereby maintaining a better seal and reducing wear. Their performance is superior to that of fixed rings. However, the design of floating rings is generally complex. In practice, not only must the precise fit between the components be considered, but also the floating stability of the ring under pressure fluid excitation and its dynamic response to pressure fluid fluctuations must be considered to prevent self-excited vibration and resonance. This leads to particular concern regarding the installation and positioning of floating rings. Achieving precise installation and positioning of floating rings, improving assembly accuracy, and achieving safe and reliable assembly are crucial for further reducing leakage and hydraulic losses. Summary of the Invention

[0005] 1. Technical problem to be solved by the invention The present invention intends to provide a floating mouth ring assembly of a centrifugal pump and a guided sealing structure thereof. The sealing structure of this embodiment can realize simple and reliable installation and precise positioning of the floating mouth ring through the combined design of the pump body, floating mouth ring and mouth ring pressure plate, thereby improving the matching and assembly accuracy of the mouth ring.

[0006] 2. Technical solution In order to achieve the above object, the technical solution provided by the present invention is: A floating port ring assembly for a centrifugal pump according to the present invention comprises: The ring pressure plate is provided with a positioning lug protruding outward in the axial direction, and the positioning lug is configured to engage with the positioning groove on the floating ring for positioning; A radially extending mounting plane is formed on the ring pressure plate toward the side where the floating ring is located, and the mounting plane is configured to contact and position with the inner wall of the pump body; a flange portion is extended on the ring pressure plate away from the side where the floating ring is located, and the outer end portion of the flange portion away from the side where the floating ring is located is configured to have an interference fit with the inner wall of the pump body.

[0007] Furthermore, the flange portion extends obliquely, and the outer end portion of the flange portion is configured to be in line contact with the inner wall of the pump body for interference fit, and a gap is maintained between the inner end portion of the flange portion near the floating ring and the inner wall of the pump body.

[0008] Furthermore, the mouth ring pressure plate includes a main ring body, and the positioning lug is arranged on the main ring body and protrudes axially; the outer end of the main ring body also extends a bent portion toward the side where the floating mouth ring is located, and a matching ring body is radially extended from the end of the bent portion. A mounting plane is formed on the wall surface of the matching ring body toward the side where the floating mouth ring is located, and a flange portion is extended from the outer end of the matching ring body away from the side where the floating mouth ring is located.

[0009] Furthermore, the mouth ring pressure plate includes a main ring body, and the positioning lug is arranged on the main ring body and protrudes axially; an installation plane is formed on the wall surface of the outer end of the main ring body facing the side where the floating mouth ring is located, and a flange portion 2 is extended from the outer end of the main ring body away from the side where the floating mouth ring is located.

[0010] Furthermore, a plurality of positioning lugs are provided on the main ring body at intervals along the circumferential direction, and the axial length of the positioning lugs is configured to extend beyond the axial thickness of the floating ring.

[0011] The present invention also provides another floating mouth ring assembly for a centrifugal pump, including a mouth ring pressure plate, on which a positioning lug protruding axially outward is provided. The positioning lug is configured to engage with a positioning groove on the floating mouth ring and extend beyond the axial thickness of the floating mouth ring. A mounting plane is formed at the axial end of the positioning lug, and the mounting plane is configured to have an interference fit with the inner wall of the pump body.

[0012] Furthermore, it also includes a floating mouth ring, the outer periphery of the floating mouth ring is provided with a positioning groove that penetrates the thickness, and the positioning lugs on the mouth ring pressure plate are correspondingly embedded in the positioning groove.

[0013] The present invention also provides a guide-type sealing structure of a floating mouth ring assembly of a centrifugal pump, comprising a pump body and an impeller, wherein the impeller is mounted on the suction port end of the pump body, and a floating mouth ring and a mouth ring pressure plate are sequentially sleeved on the outer periphery of the impeller inlet end along the water inlet direction; The pump body is provided with an installation groove for mounting the mouth ring pressure plate. The installation groove has an axial wall surface that contacts and positions with the installation plane of the mouth ring pressure plate, and the installation groove has a radial wall surface that has an interference fit with the flange portion of the mouth ring pressure plate.

[0014] Furthermore, an embedding groove is circumferentially formed on the axial wall surface, and the positioning lug on the mouth ring pressure plate fits through the positioning groove on the floating mouth ring and extends into the embedding groove.

[0015] The present invention also provides another guide-type sealing structure of a floating mouth ring assembly of a centrifugal pump, comprising a pump body and an impeller, wherein the impeller is mounted on the suction port end of the pump body, and a floating mouth ring and a mouth ring pressure plate are sequentially sleeved on the outer periphery of the impeller inlet end along the water inlet direction; A mounting groove is provided in the pump body to match the mounting mouth ring pressure plate, and an embedding groove is provided on the axial wall of the mounting groove. The positioning lug on the mouth ring pressure plate passes through the positioning groove on the floating mouth ring and extends into the embedding groove, with an interference fit on the inner wall of the embedding groove.

[0016] 3. Beneficial effects Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: (1) The guiding seal structure of the present invention adopts a floating mouth ring and a mouth ring pressure plate for combined positioning, and utilizes the cooperation of the positioning lug and the positioning groove to effectively guide and limit the radial and axial floating of the floating mouth ring; the pre-positioning is achieved by the contact between the mounting plane of the mouth ring pressure plate and the plane of the inner wall of the pump body, and the press-fit fixation is achieved by the interference fit between the flange part and the inner wall of the pump body. The assembly process is simple and reliable, and can improve the positioning and assembly accuracy, thereby reducing the leakage of the pump body and reducing the hydraulic loss.

[0017] (2) The guiding seal structure of the present invention adopts a floating mouth ring and a mouth ring pressure plate for combined positioning, and can utilize the cooperation of the positioning lug and the positioning groove to not only realize the positioning cooperation with the floating mouth ring, but also effectively guide and limit the radial and axial floating of the floating mouth ring. At the same time, the positioning lug is used as an interference fit component with the pump body, and is press-fitted with the inner wall of the groove by interference fit, which further simplifies the mouth ring pressure plate structure and realizes the precise positioning and reliable assembly of the floating mouth ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of the centrifugal pump in the embodiment; Figure 2 for Figure 1 Schematic diagram of the local enlarged structure at A in the middle; Figure 3 for Figure 1 Another perspective structural diagram of point A in the middle; Figure 4 Schematic diagram of the assembly structure of the mouth ring and the pressure plate in the embodiment; Figure 5 This is a schematic structural diagram of the floating ring in the embodiment; Figure 6 Schematic diagram of the structure of the ring pressure plate in the embodiment; Figure 7 This is a schematic diagram of the assembly of a floating ring in another embodiment; Figure 8 for Figure 7 Schematic diagram of the local enlarged structure at B in the middle; Figure 9 for Figure 7 Another perspective structural diagram of point B in the middle; Figure 10 for Figure 7 Another perspective structural diagram of point B in the middle; Figure 11 This is a schematic diagram of the assembly of a floating ring in another embodiment; Figure 12 for Figure 11 Schematic diagram of the local enlarged structure at point C in the middle.

[0019] Explanation of the numbers in the schematic diagram: 100, pump body; 101, suction port; 102, embedded groove; 103, mounting groove; 104, axial wall; 105, radial wall; 200, impeller; 201, impeller inlet end; 300, floating mouth ring; 301, positioning groove; 400, mouth ring pressure plate; 401, main ring body; 402, bending portion; 403, matching ring body; 404, flanging portion 1; 405, positioning lug; 406, opening gap; 407, flanging portion 2. DETAILED DESCRIPTION

[0020] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings.

[0021] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0022] In addition, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. The terms "first," "second," "third," and "fourth" should be understood in a broad sense and are merely names for distinguishing features, and do not indicate a specific order relationship. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0023] The present invention will be further described below with reference to the embodiments.

[0024] Example Combine Figures 1-12 As shown, this embodiment provides a floating mouth ring assembly for a centrifugal pump, including a mouth ring pressure plate 400, on which a positioning lug 405 protruding axially outward is provided, and the positioning lug 405 is configured to engage with the positioning groove 301 on the floating mouth ring 300 for positioning; wherein a radially extending mounting plane is formed on the mouth ring pressure plate 400 toward the side where the floating mouth ring 300 is located, and the mounting plane is configured to contact and position with the inner wall of the pump body 100; a flange portion extends from the side of the mouth ring pressure plate 400 away from the floating mouth ring 300, and the outer end portion of the flange portion away from the side where the floating mouth ring 300 is located is configured to have an interference fit with the inner wall of the pump body 100.

[0025] Furthermore, the flange portion extends obliquely, such as Figure 2 and Figure 3 As shown, the flange portion gradually extends radially outward in the direction axially away from the side where the floating mouth ring 300 is located, and the outer end of the flange portion is configured to achieve an interference fit with the inner wall of the pump body 100 in line contact, while a gap is maintained between the inner end of the flange portion close to the side where the floating mouth ring 300 is located and the inner wall of the pump body 100.

[0026] The mouth ring assembly of this embodiment also includes a floating mouth ring 300. Along the direction of water inflow, the floating mouth ring 300 and the mouth ring pressure plate 400 are assembled in sequence. Figure 4 and Figure 5 As shown, the outer periphery of the floating ring 300 is provided with a positioning groove 301 extending through the thickness thereof, and the positioning lug 405 on the ring pressure plate 400 is correspondingly embedded in the positioning groove 301. Further preferably, the outer periphery of the floating ring 300 is provided with a plurality of evenly distributed positioning grooves 301, and the ring pressure plate 400 is provided with a plurality of evenly spaced positioning lugs 405 that fit into the positioning grooves 301, thereby guiding and limiting the radial and axial floating of the floating ring 300.

[0027] This embodiment also provides a guided sealing structure of the floating mouth ring assembly of the above-mentioned centrifugal pump, including a pump body 100 and an impeller 200. The impeller 200 is mounted on the suction port end 101 of the pump body 100. The front end of the impeller 200 has an axially extending impeller inlet end 201. The outer periphery of the impeller inlet end 201 is sequentially sleeved with a floating mouth ring 300 and a mouth ring pressure plate 400 along the water inlet direction; a mounting groove 103 is provided in the pump body 100 to cooperate with the mounting mouth ring pressure plate 400. The mounting groove 103 has an axial wall 104 that contacts and positions with the mounting plane of the mouth ring pressure plate 400, and the mounting groove 103 has a radial wall 105 that is interference fit with the flange portion of the mouth ring pressure plate 400.

[0028] This embodiment utilizes the ring pressure plate 400 to achieve positioning and installation of the floating ring 300. The positioning lug 405 cooperates with the positioning groove 301 to achieve relative positioning between the ring pressure plate 400 and the floating ring 300, effectively guiding and limiting the radial and axial floating of the floating ring 300, and effectively preventing the floating ring 300 from circumferential rotation, thereby maintaining the relative stability of the floating ring 300 and improving positioning accuracy. Furthermore, the ring pressure plate 400 is press-fitted with the inner wall of the pump body 100 to achieve overall installation of the ring assembly. Pre-positioning is achieved by contact between the mounting surface of the ring pressure plate 400 and the inner wall of the pump body 100, and press-fit fixation is achieved by the interference fit between the flange portion and the inner wall of the pump body 100, effectively improving positioning and assembly accuracy. During actual assembly, the floating mouth ring 300 and the mouth ring pressure plate 400 can be directly pressed onto the inner wall of the pump body 100 in sequence. A floating space for the floating mouth ring 300 is formed between the mouth ring pressure plate 400 and the inner wall of the pump body 100. The installation is relatively convenient and the structural composition is simple. There is no need to make complex deformations to the structures of the floating mouth ring 300 and the mouth ring pressure plate 400, which is easier to practice in production.

[0029] This embodiment utilizes the flange portion to adopt a line contact method for interference press fitting. Compared with the whole surface contact, the processing accuracy requirements for the inner wall surface of the pump body 100 for interference press fitting can be significantly reduced, and it can be achieved through a simpler processing method. In addition, the assembly process tolerance is improved, which is more conducive to processing and production, and reduces production and maintenance costs. It also makes the sealing assembly of the mouth ring pressure plate 400 and the pump body 100 simpler, and it is easier to control and improve the sealing assembly accuracy of the mouth ring assembly, achieving safe and reliable assembly, thereby helping to reduce hydraulic losses and improve the overall performance of the pump group.

[0030] The ring pressure plate 400 can be implemented in a variety of ways. Figures 1 to 6As shown, the ring pressure plate 400 includes a main ring body 401, and a positioning lug 405 is provided on the main ring body 401 and extends axially toward the side where the floating ring 300 is located; the radial outer end of the main ring body 401 is further extended with a bent portion 402 toward the side where the floating ring 300 is located, and the axial end of the bent portion 402 is radially extended outward with a matching ring body 403, and a mounting plane is formed on the wall surface of the matching ring body 403 toward the side where the floating ring 300 is located, and the radial outer end of the matching ring body 403 is inclined to extend with a flange portion 404 toward the side away from the floating ring 300.

[0031] Combine Figure 3 As shown in the figure, during actual installation within the pump body 100, a mounting groove 103 is formed within the pump body 100. The floating ring 300 and the ring pressure plate 400 can be located together within the mounting groove 103. The radial inner wall surface of the mounting groove 103 is the radial wall surface 105, and the axial inner wall surface is the axial wall surface 104. The floating ring 300 is axially close to the axial wall surface 104 and is located within the movable gap formed below the bend 402. The floating space for the floating ring 300 is formed between the main ring body 401, the bend 402, and the axial wall surface 104. The left wall surface of the mating ring body 403 is machined with a mounting plane to achieve surface contact positioning with the axial wall surface 104. The flange portion 404 extends axially to the right to the outermost end, and is in line contact with the radial wall surface 105 for interference positioning, thus achieving precise positioning and assembly of the floating ring 300.

[0032] Combine Figure 6 As shown, the flange portion 404 and the positioning lugs 405 extend axially to different sides, and the multiple, spaced-apart groups of positioning lugs 405 are arranged discontinuously. This results in the corresponding discontinuous arrangement of the bent portion 402, the mating ring body 403, and the flange portion 404. Open gaps 406 are formed outside the positions of the positioning lugs 405 between adjacent areas. In practice, this design can be achieved by directly bending the periphery of the main ring body 401, which is relatively convenient to manufacture and provides a relatively stable overall structural strength.

[0033] More preferably, in order to ensure effective and reliable positioning of the floating ring 300, Figure 4 As shown, the axial length of the positioning lug 405 is configured to extend beyond the axial thickness of the floating mouth ring 300. When actually installed in the pump body 100, the axial wall 104 of the installation groove 103 is also surrounded by a corresponding embedding groove 102. The positioning lug 405 on the mouth ring pressure plate 400 fits through the positioning groove 301 on the floating mouth ring 300 and extends into the embedding groove 102 without contacting the inner wall of the embedding groove 102 to avoid over-positioning. Figure 3As shown, the embedded groove 102 is matched with the radial end of the positioning lug 405, which not only ensures that the positioning lug 405 can completely pass through the positioning groove 301 to prevent the floating mouth ring 300 from slipping and deflecting, but also provides an accommodation space for the positioning lug 405, and does not cause over-positioning, thereby ensuring the assembly reliability of the floating mouth ring 300 and the mouth ring pressure plate 400.

[0034] As another embodiment of the ring pressure plate 400, Figures 7 to 10 As shown, the ring pressure plate 400 includes a main ring body 401, and a positioning lug 405 is provided on the main ring body 401, protruding axially toward the side where the floating ring 300 is located. Similarly, the positioning lug 405 fits through the positioning groove 301 on the floating ring 300. However, in this embodiment, a mounting plane is formed directly on the wall surface of the outer end of the main ring body 401 facing the side where the floating ring 300 is located, and a second flange portion 407 extends from the outer end of the main ring body 401 away from the side where the floating ring 300 is located. In other words, this embodiment eliminates the multiple bends of the main ring body 401, and only needs to bend the second flange portion 407 at the radial outer end. Similarly, the second flange portion 407 preferably extends obliquely. The mounting plane is formed by machining the radial outer end of the main ring body 401 to achieve surface contact positioning with the axial wall surface 104 of the mounting groove 103, and the outer end of the second flange portion 407 is used to form an interference fit with the radial wall surface 105 of the mounting groove 103 by line contact.

[0035] Combine Figures 8-10 As shown, similarly, in this solution, a groove 102 is also provided at the lower portion of the axial wall 104 in the pump body 100, so that the positioning lug 405 on the main ring body 401 can pass through the positioning groove 301 of the floating mouth ring 300 and extend into the groove 102 accordingly without contacting the inner wall of the groove 102 to prevent over-positioning. The floating mouth ring 300 is installed in front of the main ring body 401. In practice, combined with Figure 8 As shown in the orientation, the mounting groove 103 can be set as only the mounting area of ​​the mouth ring pressure plate 400. There is also a certain mounting space on the left side of the mounting groove 103 in the pump body 100 to form a stepped distribution with the mounting groove 103 to accommodate the installation of the floating mouth ring 300. The upper end of the embedded groove 102 is connected to the mounting groove 103, and the lower end is connected to the installation space of the floating mouth ring 300. At this time, a floating space for the floating mouth ring 300 is formed on the left side of the main ring body 401.

[0036] As another embodiment of the ring pressure plate 400, Figures 11 to 12 As shown, the ring pressure plate 400 is provided with a positioning lug 405 that protrudes axially toward the side where the floating ring 300 is located. The positioning lug 405 is configured to engage with the positioning groove 301 on the floating ring 300 and extend axially beyond the axial thickness of the floating ring 300; the axial end of the positioning lug 405 is formed with a mounting plane, which is configured to have an interference fit with the inner wall of the pump body 100.

[0037] Correspondingly, in the guided sealing structure at this time, an installation groove 103 is also provided in the pump body 100 to cooperate with the installation of the mouth ring pressure plate 400, and an embedding groove 102 is opened on the axial wall 104 of the installation groove 103. The positioning lug 405 on the mouth ring pressure plate 400 cooperates to pass through the positioning groove 301 on the floating mouth ring 300 and extends into the embedding groove 102, and has an interference fit with the inner wall of the embedding groove 102.

[0038] This solution further simplifies the structure of the ring pressure plate 400. The positioning lugs 405 not only achieve positioning and coordination with the floating ring 300, effectively guiding and limiting the radial and axial movement of the floating ring 300 and preventing circumferential deflection of the floating ring 300, but also serve as interference fit components for the pump body 100. The positioning lugs 405 extend beyond the floating ring 300 and further into the groove 102 on the inner wall of the pump body 100, achieving an interference fit and press fit with the inner wall of the groove 102. This also ensures precise positioning and reliable assembly of the floating ring 300.

[0039] In this embodiment, the floating ring 300 is preferably made of a wear-resistant material such as PIFE, and is fabricated into a smooth, annular thin sheet structure with a thickness of, for example, 2 mm, exhibiting a certain degree of toughness and wear resistance. A positioning groove 301 is provided around the periphery, cooperating with a positioning lug 405 on the ring pressure plate 400 to guide and limit the radial floating of the floating ring 300. The ring pressure plate 400 is preferably a stainless steel stamping, assembled with an interference fit to the pump body 100 to form a floating working space for the floating ring 300. The mounting surface and flange design ensure accurate assembly and positioning within the pump body 100. The combined positioning method of the floating ring 300 and the ring pressure plate 400 not only simplifies the structure and facilitates a simple and feasible assembly process, but also enables control of the floating freedom of the floating ring 300. Micro-floating control is achieved through floating guides, avoiding gap fluctuations caused by excessive, multi-dimensional floating freedom, which can hinder the formation of a stable dynamic seal.

[0040] The scope of protection of the present invention is limited only by the claims. Thanks to the teachings of the present invention, those skilled in the art will readily recognize that alternative structures to the structures disclosed in the present invention can be used as viable alternative embodiments, and that the embodiments disclosed in the present invention can be combined to produce new embodiments, which also fall within the scope of the appended claims.

Claims

1. A floating ring assembly for a centrifugal pump, characterized in that: include: A mouth ring pressure plate (400), the mouth ring pressure plate (400) is provided with a positioning lug (405) protruding outward in the axial direction, and the positioning lug (405) is configured to engage with the positioning groove (301) on the floating mouth ring (300) for positioning; A radially extending mounting plane is formed on the ring pressure plate (400) on the side where the floating ring (300) is located, and the mounting plane is configured to contact and position with the inner wall of the pump body (100); a flange portion is extended on the ring pressure plate (400) away from the side where the floating ring (300) is located, and the outer end portion of the flange portion away from the side where the floating ring (300) is located is configured to have an interference fit with the inner wall of the pump body (100).

2. A centrifugal pump floating ring assembly according to claim 1, characterized in that: The flange portion extends obliquely, and the outer end portion of the flange portion is configured to be in line contact with the inner wall of the pump body (100) in an interference fit, and a gap is maintained between the inner end portion of the flange portion on the side where the floating mouth ring (300) is located and the inner wall of the pump body (100).

3. A floating ring assembly for a centrifugal pump according to claim 2, characterized in that: The mouth ring pressure plate (400) includes a main ring body (401), and a positioning lug (405) is provided on the main ring body (401) and protrudes axially; the outer end of the main ring body (401) is further extended with a bent portion (402) toward the side where the floating mouth ring (300) is located, and a matching ring body (403) is radially extended from the end of the bent portion (402), and a mounting plane is formed on the wall surface of the matching ring body (403) toward the side where the floating mouth ring (300) is located, and a flange portion (404) is extended from the outer end of the matching ring body (403) away from the side where the floating mouth ring (300) is located.

4. A floating ring assembly for a centrifugal pump according to claim 2, characterized in that: The mouth ring pressure plate (400) includes a main ring body (401), and a positioning lug (405) is provided on the main ring body (401) and protrudes axially; an installation plane is formed on the wall surface of the outer end of the main ring body (401) facing the side where the floating mouth ring (300) is located, and a second flange portion (407) is extended from the outer end of the main ring body (401) away from the side where the floating mouth ring (300) is located.

5. The floating ring assembly of a centrifugal pump according to claim 1, characterized in that: A plurality of positioning lugs (405) are provided on the main ring body (401) at intervals along the circumferential direction, and the axial length of the positioning lugs (405) is configured to extend beyond the axial thickness of the floating mouth ring (300).

6. A floating ring assembly for a centrifugal pump, characterized by: The invention comprises a mouth ring pressure plate (400), wherein the mouth ring pressure plate (400) is provided with a positioning lug (405) protruding outward in the axial direction, and the positioning lug (405) is configured to engage with the positioning groove (301) on the floating mouth ring (300) for positioning, and extends beyond the axial thickness of the floating mouth ring (300); an installation plane is formed at the axial end of the positioning lug (405), and the installation plane is configured to have an interference fit with the inner wall of the pump body (100).

7. A floating ring assembly for a centrifugal pump according to any one of claims 1 to 6, characterized in that: It also includes a floating mouth ring (300), the outer periphery of the floating mouth ring (300) is provided with a positioning groove (301) that penetrates the thickness, and the positioning lug (405) on the mouth ring pressure plate (400) is correspondingly embedded in the positioning groove (301).

8. A guide seal structure for a floating ring assembly of a centrifugal pump according to any one of claims 1 to 5, characterized in that: The pump comprises a pump body (100) and an impeller (200), wherein the impeller (200) is mounted on the suction port (101) of the pump body (100), and a floating mouth ring (300) and a mouth ring pressure plate (400) are sequentially sleeved on the outer periphery of the impeller inlet end (201) along the water inlet direction; A mounting groove (103) is provided in the pump body (100) for mounting the mouth ring pressure plate (400). The mounting groove (103) has an axial wall surface (104) that contacts and positions the mounting plane of the mouth ring pressure plate (400). The mounting groove (103) has a radial wall surface (105) that is interference-fitted with the flange portion of the mouth ring pressure plate (400).

9. The guide seal structure of a floating ring assembly of a centrifugal pump according to claim 8, characterized in that: An embedding groove (102) is also provided around the axial wall (104), and the positioning lug (405) on the mouth ring pressure plate (400) fits through the positioning groove (301) on the floating mouth ring (300) and extends into the embedding groove (102).

10. A guide seal structure for a floating ring assembly of a centrifugal pump according to claim 6, characterized in that: The pump comprises a pump body (100) and an impeller (200), wherein the impeller (200) is mounted on the suction port (101) of the pump body (100), and a floating mouth ring (300) and a mouth ring pressure plate (400) are sequentially sleeved on the outer periphery of the impeller inlet end (201) along the water inlet direction; A mounting groove (103) is provided in the pump body (100) to cooperate with the mounting mouth ring pressure plate (400), and an embedding groove (102) is provided on the axial wall (104) of the mounting groove (103). The positioning lug (405) on the mouth ring pressure plate (400) passes through the positioning groove (301) on the floating mouth ring (300) and extends into the embedding groove (102), thereby forming an interference fit with the inner wall of the embedding groove (102).

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