A mouth ring assembly and pump unit

Abstract

The utility model discloses a kind of mouth ring assemblies and pump units, belong to pump unit field.The utility model's mouth ring assembly includes mouth ring seat, and the inboard of mouth ring seat is formed with the insetting space of floating mouth ring;Floating mouth ring is configured as gap fit to be sleeved on the inlet end outside of impeller, and floating mouth ring part is insetting in the insetting space of mouth ring seat;Outer skeleton inboard is connected with mouth ring seat, and outside is configured as corresponding assembly with pump body inner wall;The radial length L3 of floating mouth ring beyond mouth ring seat part is less than the radial length L4 insetting in mouth ring seat;And the radial clearance L2 between floating mouth ring outer wall and mouth ring seat inner wall is configured as less than the radial clearance L1 between floating mouth ring inner wall and impeller outer wall.The utility model is helpful to improve the assembly accuracy of floating mouth ring, reduce the wear and tear of floating mouth ring, the condition of increasing leakage amount, reduce waterway loss.

Description

Technical Field

[0001] This utility model relates to the field of pump unit technology, and more specifically, to a mouth ring assembly and a pump unit. Background Technology

[0002] As the core power component of a fluid transport system, the pump body's operating efficiency and reliability directly impact the energy consumption and maintenance costs of equipment in fields such as energy, chemical engineering, and water conservancy and irrigation. In rotating machinery such as high-speed centrifugal pumps and multistage pumps, the dynamic sealing performance between the impeller and the pump casing is a key factor determining pump efficiency. The clearance mismatch problem caused by insufficient assembly precision in traditional fixed-type impeller rings has become a technical bottleneck restricting the improvement of pump body performance. To address this, a floating-type impeller ring structure has emerged, which significantly improves sealing efficiency through a unique dynamic compensation mechanism.

[0003] Floating impeller rings possess dynamic self-adaptability, automatically adjusting their concentricity with the impeller to avoid efficiency losses caused by localized friction. However, the efficiency of floating impeller rings is also highly dependent on assembly precision, exhibiting significant sensitivity to axial and radial positioning accuracy. Poor ring positioning precision can lead to accelerated wear, hydraulic performance loss, and even loss of self-adaptability. Therefore, improving the assembly precision of floating impeller rings to reduce pump hydraulic losses remains a key concern in the industry.

[0004] A search revealed that Chinese Patent Publication No. CN113027804B discloses a mouth ring assembly and a water pump using the mouth ring assembly. By designing a floating mouth ring assembly, the impeller-pump body clearance is automatically adjusted, reducing friction and preventing water leakage, thus improving the pump's efficiency and performance. However, practical experience shows that this design still has room for improvement in terms of assembly precision. Utility Model Content

[0005] 1. Technical problem to be solved by the utility model The purpose of this utility model is to provide a mouth ring assembly and a pump unit. Using this mouth ring assembly can effectively improve the assembly accuracy of the floating mouth ring, further reduce hydraulic losses, and improve the overall performance of the pump body.

[0006] 2. Technical Solution To achieve the above objectives, the technical solution provided by this utility model is as follows: The present invention provides a mouth ring assembly, comprising: A mouth ring seat, with a space for mounting a floating mouth ring formed on the inner side of the mouth ring seat; A floating mouth ring is configured to be fitted with a clearance fit on the outside of the impeller inlet end, and the floating mouth ring is partially embedded in the mounting space of the mouth ring seat. The outer frame is connected to the inlet ring seat on the inner side, and the outer side is configured to align with the inner wall of the pump body. The radial length L3 of the floating port ring beyond the outlet ring seat is less than the radial length L4 embedded in the port ring seat; and the radial clearance L2 between the outer wall of the floating port ring and the inner wall of the port ring seat is configured to be less than the radial clearance L1 between the inner wall of the floating port ring and the outer wall of the impeller.

[0007] Furthermore, the length L3 of the floating port ring exceeding the outlet ring seat is within 40% of the length L4 of the embedded part.

[0008] Furthermore, the outer frame includes a frame body and an inner mounting ring extending radially inward from the end of the frame body. The inner mounting ring seat has a mounting groove for fitting the inner mounting ring. The radial length L5 of the inner mounting ring embedded in the mounting groove is not less than 15% of the radial length L6 of the inner mounting ring.

[0009] Furthermore, the exoskeleton also includes an outward-curving ring, which is distributed around the outside of the main body of the exoskeleton and extends obliquely toward the outside of the main body of the exoskeleton.

[0010] Furthermore, the hardness of the floating mouth ring is greater than that of the mouth ring seat, but less than that of the outer skeleton.

[0011] Furthermore, the floating ring is made of plastic with an elastic modulus between 250-300 MPa.

[0012] Furthermore, the outer frame is made of metal with an elastic modulus between 150-200 GPa.

[0013] Furthermore, the mouth ring seat is made of rubber with an elastic modulus between 5 and 10 MPa.

[0014] This utility model also provides a pump unit, including a pump body, an impeller and a mouth ring assembly at the inlet of the pump body, the mouth ring assembly being sleeved on the outer periphery of the impeller inlet end to provide radial sealing between the impeller and the pump body.

[0015] Furthermore, the outer side of the outer frame is interference-fitted with the inner wall of the pump body, and the interference is between 0.05-0.15mm on each side.

[0016] 3. Beneficial effects Compared with the prior art, the technical solution provided by this utility model has the following advantages: (1) The pump unit of this utility model adopts a floating ring, a ring seat and an outer frame to be assembled into an integral structure in sequence. The outer frame cooperates with the inner wall of the pump body to fix it. The floating ring achieves floating sealing and controls the radial gap L2 between the outer wall of the ring and the inner wall of the ring seat to be less than the radial gap L1 between the inner wall of the ring and the outer wall of the impeller. This can effectively ensure the floating sealing effect of the floating ring, avoid the phenomenon of jamming between the floating ring and the outer wall of the impeller, reduce the wear, noise and leakage of the floating ring, improve the assembly accuracy and reduce hydraulic loss.

[0017] (2) In the pump unit of this utility model, the radial length L3 of the floating port ring exceeding the outlet ring seat is controlled to be less than the radial length L4 embedded in the port ring seat, so as to fully ensure the installation stability of the floating port ring and the convenience of regular maintenance of the floating port ring, and further ensure the assembly accuracy of the floating port ring.

[0018] (3) In the pump unit of this utility model, the outer frame and the inlet ring seat are installed together. The radial length L5 of the inner mounting ring embedded in the mounting groove is not less than 15% of the radial length L6 of the inner mounting ring. This can fully ensure the stability of the fit between the outer frame and the inlet ring seat, and also ensure the stability of the fit when the inlet ring assembly is pressed together. This further improves the assembly accuracy, ensures the floating sealing effect of the floating inlet ring, reduces hydraulic loss, and optimizes the performance of the pump unit.

[0019] (4) In the pump unit of this utility model, the hardness of the floating mouth ring is greater than that of the mouth ring seat and less than that of the outer frame. This makes it easy for the floating mouth ring to be inserted into the mouth ring seat, while also ensuring that the mouth ring seat has a certain limiting effect on the floating mouth ring after installation, preventing the floating mouth ring from easily moving during operation, causing wear, noise, and increased leakage. Attached Figure Description

[0020] Figure 1 This is an exploded view of the mouth ring assembly in the embodiment; Figure 2 for Figure 1 Schematic diagram of cross-section; Figure 3 This is a schematic diagram showing the assembly state of the mouth ring assembly in the embodiment; Figure 4 This is a schematic diagram of the assembly of the mouth ring assembly within the pump body in the embodiment. Figure 1 ; Figure 5 for Figure 4 A magnified schematic diagram of the partial structure at point A in the middle; Figure 6 This is a schematic diagram of the assembly of the mouth ring assembly within the pump body in the embodiment. Figure 2 ; Figure 7 for Figure 6 Schematic diagram of the enlarged structure at point B in the middle Figure 1 ; Figure 8 for Figure 6 Schematic diagram of the enlarged structure at point B in the middle Figure 2 ; Figure 9 for Figure 6 Schematic diagram of the enlarged structure at point B in the middle Figure 3 .

[0021] Explanation of the labels in the diagram: 100. Pump body; 101. Pump mounting surface; 200. Impeller; 201. Impeller protrusion; 300. Floating mouth ring; 301. Outer wall surface of mouth ring; 302. Inner wall surface of mouth ring; 310. Mouth ring seat; 311. Main ring body; 312. Upper ring portion; 313. Lower ring portion; 314. Extension portion; 315. Outer ring portion; 320. Outer frame; 321. Main frame body; 322. Outward-facing ring; 323. Inner mounting ring. Detailed Implementation

[0022] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.

[0023] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. The terms "first," "second," "third," and "fourth" should also be interpreted broadly, merely distinguishing feature names and not indicating a specific sequential relationship. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] The present invention will be further described below with reference to the embodiments.

[0026] Example Combination Figures 1-9 As shown, a mouth ring assembly according to this embodiment includes: The mouth ring seat 310 has an inner side forming an insertion space for the floating mouth ring 300; The floating mouth ring 300 is configured to be fitted with a clearance fit on the outside of the inlet end of the impeller 200, and the floating mouth ring 300 is partially embedded in the mounting space of the mouth ring seat 310. The outer frame 320 is connected to the inlet ring seat 310 on its inner side and is configured to be assembled with the inner wall of the pump body 100 on its outer side. The radial length L3 of the portion of the floating mouth ring 300 that extends beyond the mouth ring seat 310 is less than the radial length L4 embedded in the mouth ring seat 310; and the radial clearance L2 between the outer wall of the floating mouth ring 300 and the inner wall of the mouth ring seat 310 is configured to be less than the radial clearance L1 between the inner wall of the floating mouth ring 300 and the outer wall of the impeller 200.

[0027] In this embodiment, the mouth ring assembly adopts a floating mouth ring 300, a mouth ring seat 310, and an outer frame 320, which are assembled in sequence to form an integral structure, thereby improving the assembly accuracy of the floating mouth ring 300. The outer frame 320 cooperates with the inner wall of the pump body 100 for fixation, the floating mouth ring 300 achieves floating sealing, and the mouth ring seat 310 is connected between the floating mouth ring 300 and the outer frame 320 for cooperation.

[0028] In this embodiment, the floating ring 300 has an inner ring wall surface 302 and an outer ring wall surface 301 on its inner and outer sides, respectively, combined with Figure 7 As shown, the radial clearance L2 between the outer wall surface 301 of the floating ring 300 and the inner wall of the ring seat 310 is configured to be smaller than the radial clearance L1 between the inner wall surface 302 of the floating ring 300 and the outer wall of the impeller 200. This can effectively ensure the floating sealing effect of the floating ring 300 and prevent jamming between the other side of the floating ring 300 and the outer wall of the impeller 200 when the floating ring 300 is closest to the inner wall of the ring seat 310 on one side within the floating range. This reduces wear, noise, and increased leakage of the floating ring 300, improves assembly accuracy, and reduces hydraulic loss.

[0029] Combination Figure 8As shown, in this embodiment, the radial length L3 of the portion of the floating mouth ring 300 extending beyond the exit ring seat 310 is further controlled to be less than the radial length L4 embedded in the mouth ring seat 310. This ensures the installation stability of the floating mouth ring 300 and the convenience of regular maintenance, further guaranteeing the assembly accuracy of the floating mouth ring 300. More specifically, the radial length L3 of the floating mouth ring 300 extending beyond the exit ring seat 310 is within 40% of the radial length L4 of the embedded portion. In practice, L3 can be set to 40%, 30%, 25%, 20%, 10%, etc., of L4.

[0030] Combination Figure 2 As shown, regarding the specific structural design of the mouth ring seat 310, the following design can be adopted, including a main ring body 311. The main ring body 311 has an upper ring portion 312 and a lower ring portion 313 at both ends of its axial height. Both the upper ring portion 312 and the lower ring portion 313 are annular and extend inward along the radial direction of the main ring body 311, thereby forming an annular fitting space between the upper ring portion 312 and the lower ring portion 313 for the floating mouth ring 300 to be fitted inward. Furthermore... Figure 2 As shown in the center position, the radially inner end of the lower ring portion 313 is also provided with an extension portion 314 extending downward along the axial direction. The extension portion 314 is distributed in a ring shape and the bottom end is provided with an outer ring portion 315 extending radially outward. The outer ring portion 315 is also distributed in a ring shape around the perimeter, thereby forming a ring-shaped mounting groove between the outer ring portion 315 and the lower ring portion 313. This mounting groove is used to fit with the outer frame 320 for insertion.

[0031] Furthermore, regarding the specific structural design of the exoskeleton 320, combined with Figure 2 As shown, the design can include a ring-shaped skeleton body 321. The axial end of the skeleton body 321 has an inner mounting ring portion 323 extending radially inward. The inner mounting ring portion 323 also surrounds the entire body in a ring shape and is configured to mate with the mounting groove formed on the outer side of the mouth ring seat 310. Preferably, it is combined with... Figure 9 As shown, the radial length L5 of the inner mounting ring 323 embedded in the mounting groove is not less than 15% of the radial length L6 of the inner mounting ring 323. More preferably, the radial length L5 is 30%-60% of L6. In practice, specific values ​​such as 30%, 40%, 50%, and 60% can be used. This ensures the stability of the fit between the outer frame 320 and the mouth ring seat 310, as well as the stability of the fit during the overall press-fitting of the mouth ring assembly. This further improves assembly accuracy, ensures the floating sealing effect of the floating mouth ring 300, and reduces hydraulic loss.

[0032] Combination Figure 3As shown, this is the assembled state of the mouth ring assembly. The floating mouth ring 300 is partially embedded in the mounting space of the mouth ring seat 310. The inner mounting ring 323 at the bottom of the outer frame 320 is correspondingly embedded in the mounting groove formed at the bottom of the mouth ring seat 310, and the inner sidewall of the frame body 321 is correspondingly fitted and assembled with the outer sidewall of the mouth ring seat 310. Figure 4 and Figure 5 As shown, within the pump unit structure, the outer wall of the frame body 321 is positioned and installed with an interference fit to the inner wall of the pump body 100.

[0033] More preferably, combined with Figure 2 As shown, the exoskeleton 320 also includes an outward-flaring ring 322, which is distributed around the outside of the main skeleton 321 and extends upward at an angle towards the outside of the main skeleton 321. In practice, it is combined with... Figure 4 and Figure 5 As shown, the entire outer circumference of the frame body 321 can be used as the mounting wall surface for interference fit with the inner wall of the pump body 100, achieving surface fit interference press fitting; alternatively, as shown in the figure... Figure 6 and Figure 7 As shown, the outer circumferential side of the outward-flaring ring 322 serves as the mounting surface for an interference fit with the inner wall of the pump body 100. Since the outward-flaring ring 322 is directly inclined and flanged at the end of the frame body 321, its outermost end only has a line contact fit with the inner wall of the pump body 100. This results in a certain radial gap remaining between the outer wall of the frame body 321 and the inner wall of the pump body 100, with the interference fit achieved only through the line contact area between the outward-flaring ring 322 and the inner wall of the pump body 100. This not only utilizes the outward-flaring ring 322 for self-positioning but also reduces the contact area, lowering the precision requirements for the inner wall of the pump body 100 at this point. It can be achieved through a simpler machining method, making it easier to manufacture.

[0034] Furthermore, in this embodiment, the hardness of the floating mouth ring 300 is preferably greater than that of the mouth ring seat 310, but less than that of the outer frame 320. The outer frame 320 is used to fix the mouth ring assembly as a whole, ensuring the flexible floating sealing effect of the floating mouth ring 300. In this way, while facilitating the insertion of the floating mouth ring 300 into the mouth ring seat 310, it also ensures that after the floating mouth ring 300 is installed, the mouth ring seat 310 has a certain restraining effect on the floating mouth ring 300, preventing the floating mouth ring 300 from easily moving during operation, causing problems such as wear, noise, and increased leakage.

[0035] In practice, specifically, the floating mouth ring 300 is made of plastic with an elastic modulus between 250-300 MPa. The outer frame 320 is made of metal with an elastic modulus between 150-200 GPa, and it is fixed to the pump body 100. The mouth ring seat 310 is made of rubber with an elastic modulus between 5-10 MPa, and it facilitates the fit between the outer frame 320 and the floating mouth ring 300.

[0036] This embodiment also provides a pump unit, including a pump body 100. The pump body 100 has an impeller 200 and a mouth ring assembly as described above at its inlet. The mouth ring assembly is sleeved on the outer periphery of the inlet end of the impeller 200 to provide a radial seal between the impeller 200 and the pump body 100.

[0037] More specifically, combining Figure 7 As shown, the impeller 200 has an impeller protrusion 201 circumferentially arranged at the inlet end, and the mouth ring assembly is fitted on the outer periphery of the impeller protrusion 201. The pump body 100 has a corresponding assembly groove at the inlet for installing the mouth ring assembly. The inner wall of the assembly groove serves as the pump assembly surface 101, which is used to assemble with the outer frame 320.

[0038] Furthermore, the outer surface of the outer frame 320 is press-fitted with the inner wall of the pump body 100, with an interference fit of 0.05-0.15mm on each side. Specifically, it is press-fitted with the outer wall of the frame body 321 or with the outer wall of the outward-facing ring 322. This ensures the stability of the press-fit between the outer frame 320 and the pump body 100. The perpendicularity of the outer frame 320 to the bottom surface of the mounting groove on the pump body 100 is further controlled within 0.05mm, and the machining accuracy is controlled to ≤Ra3.2.

[0039] In this embodiment, the inner side of the outer skeleton 320 and the outer radial side of the mouth ring seat 310 are fitted with an interference fit or a clearance fit, and the bottom end of the outer skeleton 320 is embedded in the mouth ring seat 310 to achieve a dual positioning fit in both the axial and radial directions. The floating mouth ring 300 and the mouth ring seat 310 maintain a clearance fit in both the axial and radial directions to facilitate the floating of the floating mouth ring 300.

[0040] The scope of protection of this utility model is defined only by the claims. Thanks to the teachings of this utility model, those skilled in the art will readily recognize that alternative structures to the disclosed structure can be used as feasible alternative implementations, and that the disclosed implementations can be combined to produce new implementations, which also fall within the scope of the appended claims.

Claims

1. A ring assembly, comprising: include: Mouth ring seat (310), and a space for mounting a floating mouth ring (300) is formed on the inner side of mouth ring seat (310); A floating mouth ring (300) is configured to be fitted with a clearance fit on the outside of the inlet end of the impeller (200), and the floating mouth ring (300) is partially embedded in the mounting space of the mouth ring seat (310). The outer frame (320) is connected to the inlet ring seat (310) on the inner side and is configured to be assembled with the inner wall of the pump body (100) on the outer side. The radial length L3 of the portion of the floating mouth ring (300) extending beyond the mouth ring seat (310) is less than the radial length L4 embedded in the mouth ring seat (310); and the radial clearance L2 between the outer wall of the floating mouth ring (300) and the inner wall of the mouth ring seat (310) is configured to be less than the radial clearance L1 between the inner wall of the floating mouth ring (300) and the outer wall of the impeller (200).

2. A ring assembly according to claim 1, wherein: The length L3 of the floating mouth ring (300) exceeding the outlet ring seat (310) is within 40% of the length L4 of the embedded part.

3. A ring assembly according to claim 1, wherein: The outer frame (320) includes a frame body (321) and an inner mounting ring (323) extending radially inward from the end of the frame body (321). The ring seat (310) has a mounting groove for the inner mounting ring (323) to be fitted into it. The radial length L5 of the inner mounting ring (323) embedded in the mounting groove is not less than 15% of the radial length L6 of the inner mounting ring (323).

4. A ring assembly according to claim 3, wherein: The exoskeleton (320) also includes an outward-turned ring (322), which is distributed around the outside of the skeleton body (321) and extends obliquely toward the outside of the skeleton body (321).

5. A ring assembly according to claim 1, wherein: The hardness of the floating mouth ring (300) is greater than that of the mouth ring seat (310) and less than that of the outer skeleton (320).

6. A ring assembly according to claim 5, wherein: The floating mouth ring (300) is made of plastic with an elastic modulus between 250-300MPa.

7. A ring assembly according to claim 6, wherein: The outer frame (320) is made of metal with an elastic modulus between 150-200 GPa.

8. A ring assembly according to claim 7, wherein: The mouth ring seat (310) is made of rubber with an elastic modulus between 5 and 10 MPa.

9. A pump assembly, characterized by: The pump body (100) includes an impeller (200) and a mouth ring assembly as described in any one of claims 1-8 at the inlet of the pump body (100). The mouth ring assembly is sleeved on the outer periphery of the inlet end of the impeller (200) to provide a radial seal between the impeller (200) and the pump body (100).

10. A pump assembly according to claim 9, wherein: The outer side of the outer frame (320) is interference-fitted with the inner wall of the pump body (100), and the interference is between 0.05-0.15mm on one side.

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