A pump unit suction port ring mounting structure

Abstract

The utility model discloses a kind of mouth ring mounting structures of pump unit suction port, belong to pump unit field.The mouth ring assembly in the utility model includes mouth ring seat, and the inboard of mouth ring seat is formed with the inlaying space of floating mouth ring;Floating mouth ring is configured as gap fit and is sleeved on the inlet end outside of impeller, and floating mouth ring part is inlayed in the inlaying space of mouth ring seat;The skeleton main body bottom end of outer skeleton is connected with mouth ring seat by extending inward, and the top end of skeleton main body is equipped with everted ring part, and the radial outermost end of everted ring part and pump assembly surface are linear contact interference fit, so that the radial clearance between the outer wall surface of skeleton main body and pump assembly surface is kept.The utility model realizes linear contact fit between pump assembly surface, and the machining precision requirement of pump body assembly groove can be obviously reduced, can be obtained by simpler processing mode, and assembly technology tolerance improves, more conducive to production and processing, reduce production maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of pump unit technology, and more specifically, to a port ring mounting structure for the suction inlet of 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 affect 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. In the structure of a centrifugal pump, the floating inlet ring installed at the pump body's suction inlet is a crucial component affecting the pump body's sealing performance and operating efficiency.

[0003] In practice, the sealing assembly of floating rings is highly dependent on machining accuracy. To ensure the sealing performance between the ring and the pump housing mounting surface, high-precision machining of both the pump housing mounting surface and the ring mating surface is required, typically requiring an accuracy of IT6 or higher. This leads to complex machining processes, increased machining costs, and a high risk of machining deformation, as well as insufficient tolerance during assembly. Therefore, optimizing the fit between the pump body and the ring, reducing the machining difficulty of key components, and improving the tolerance of the assembly process, while ensuring sealing performance, has significant industrial value in reducing maintenance costs. Utility Model Content

[0004] 1. Technical problem to be solved by the utility model The purpose of this utility model is to provide a pump unit suction inlet ring mounting structure, which can effectively reduce the difficulty of pump casing processing and inlet ring sealing assembly, and improve sealing assembly accuracy. 2. Technical Solution To achieve the above objectives, the technical solution provided by this utility model is as follows: This utility model discloses a port ring mounting structure for the inlet of a pump unit, including a pump body, an impeller at the inlet end of the pump body, and a port ring assembly at the inlet end of the impeller, the port ring assembly providing radial sealing between the impeller and the pump body; the port ring assembly includes: 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 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 includes a ring-shaped frame body. The bottom end of the frame body extends inward and connects to the mouth ring seat. The top end of the frame body is provided with an outward-turned ring. The outward-turned ring extends obliquely towards the outside of the frame body. The outermost radial end of the outward-turned ring is in line contact with the pump assembly surface on the inner wall of the pump body, so that a certain radial gap is maintained between the outer wall surface of the frame body and the pump assembly surface.

[0005] Furthermore, the interference fit between the outermost end of the outward-facing ring and the pump mounting surface is between 0.05-0.15mm on each side.

[0006] Furthermore, the pump body is provided with an assembly groove for installing the mouth ring assembly, and the perpendicularity between the main body of the frame and the bottom surface of the assembly groove is within 0.05mm.

[0007] Furthermore, the machining accuracy of the pump assembly surface is ≤Ra3.2.

[0008] Furthermore, the radial clearance L2 between the outer wall of the floating ring and the inner wall of the ring seat is smaller than the radial clearance L1 between the inner wall of the floating ring and the outer wall of the impeller.

[0009] Furthermore, the radial length L3 of the floating mouth ring beyond the mouth ring seat is less than the radial length L4 embedded in the mouth ring seat.

[0010] 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.

[0011] Furthermore, the bottom of the main frame extends radially inward to form an inner mounting ring, and the bottom of the ring seat has a corresponding mounting groove for the inner mounting ring to fit into; 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.

[0012] 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.

[0013] Furthermore, the floating mouth ring is made of plastic with an elastic modulus between 250-300 MPa; the outer frame is made of metal with an elastic modulus between 150-200 GPa; and the mouth ring seat is made of rubber with an elastic modulus between 5-10 MPa.

[0014] 3. Beneficial effects Compared with the prior art, the technical solution provided by this utility model has the following advantages: (1) The mouth ring installation structure of this utility model has an outwardly extended inclined ring at the top of the outer frame to achieve line contact with the pump assembly surface. The processing accuracy requirements of the pump body assembly groove can be significantly reduced, and it can be obtained through a simpler processing method. The assembly process tolerance is improved, which is more conducive to production and processing, reduces production and maintenance costs, and makes the sealing assembly of the mouth ring assembly with the pump body simpler, easier to control and improve the sealing assembly accuracy.

[0015] (2) The mouth ring installation structure of this utility model effectively controls the assembly of the mouth ring assembly, controls the radial clearance L2 to be less than L1 to avoid wear and jamming of the floating mouth ring; controls the radial length L3 to be less than L4 to fully ensure the installation stability of the floating mouth ring; controls the radial length L5 to be not less than 15% of L6 to ensure the fit stability of the mouth ring assembly during overall press-fitting, etc., and comprehensively cooperates to further improve the assembly accuracy of the mouth ring assembly and reduce hydraulic loss. Attached Figure Description

[0016] Figure 1 This is an exploded view of the mouth ring assembly in the embodiment; Figure 2 for Figure 1 A schematic diagram of the cross-sectional view; 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 5 for Figure 4 Schematic diagram of the enlarged structure at point B in the middle Figure 1 ; Figure 6 for Figure 4 Schematic diagram of the enlarged structure at point B in the middle Figure 2 ; Figure 7 for Figure 4 Schematic diagram of the enlarged structure at point B in the middle Figure 3 .

[0017] 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

[0018] 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.

[0019] 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.

[0020] 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.

[0021] The present invention will be further described below with reference to the embodiments.

[0022] Example Combination Figures 1-7 As shown, this embodiment provides a port ring mounting structure for the suction inlet of a pump unit, including a pump body 100. An impeller 200 is provided at the inlet of the pump body 100, and a port ring assembly is fitted onto the inlet end of the impeller 200. The port ring assembly provides a radial seal between the impeller 200 and the pump body 100. More specifically, an impeller protrusion 201 is circumferentially provided at the inlet end of the impeller 200, and the port ring assembly is fitted onto the outer periphery of the impeller protrusion 201. In this embodiment, the port ring assembly structure is combined with... Figures 1-3 As shown, it 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 its outer side is configured to mate with the inner wall of the pump body 100; more specifically, in conjunction with Figures 4-7As shown, the outer frame 320 includes an annular frame body 321. The bottom end of the frame body 321 extends inward and connects to the inlet ring seat 310. The top end of the frame body 321 is provided with an outwardly flared ring portion 322, which extends obliquely outward toward the outer side of the frame body 321. The outermost radial end of the outwardly flared ring portion 322 has a line contact interference fit with the pump assembly surface 101 on the inner wall of the pump body 100, so that the outer wall surface of the frame body 321 and the pump assembly surface 101 maintain a certain radial clearance and do not contact each other. In practice, a corresponding assembly groove is provided in the pump body 100, and the inlet ring assembly is installed in the corresponding assembly groove. The circumferential inner wall of the assembly groove is the pump assembly surface 101.

[0023] Unlike the traditional method of using the mouth ring assembly to press-fit the entire surface of the pump body 100, this embodiment uses an outwardly extending inclined folded ring portion 322. The outermost radial part of the folded ring portion 322 is used as the mounting wall surface for the interference fit with the pump assembly surface 101. The outermost end of the folded ring portion 322 only has a line contact fit with the pump assembly surface 101, so that a certain radial gap is still maintained between the annular outer wall of the skeleton body 321 and the inner wall of the pump assembly surface 101. The interference fit is only made using the line contact area between the folded ring portion 322 and the pump assembly surface 101. This not only utilizes the outward-facing ring 322 for self-positioning, but also significantly reduces the machining accuracy requirements for the pump body 100 assembly groove compared to the traditional surface contact assembly method. Since the machining accuracy requirements for the pump assembly surface 101 are reduced, they can be obtained through simpler machining methods, and the assembly process tolerance is improved, which is more conducive to production and processing, reduces production and maintenance costs, and makes the sealing assembly of the entire ring assembly with the pump body 100 simpler, easier to control and improve the sealing assembly accuracy, reduces water loss, and improves the overall performance of the pump set.

[0024] Specifically, in practice, the outward-facing ring 322 is press-fitted with the inner wall of the pump assembly surface 101, with the interference amount being between 0.05-0.15mm on each side, ensuring the stability of the press-fit between the outer frame 320 and the pump body 100. Furthermore, the perpendicularity between the outer frame 320 and the bottom surface of the assembly groove on the pump body 100 can be controlled within 0.05mm, and the machining accuracy of the pump assembly surface 101 can be controlled to ≤Ra3.2 to meet assembly requirements, effectively reducing machining accuracy and difficulty.

[0025] 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.

[0026] More preferably, in this embodiment, the annular body of the floating mouth ring 300 has an inner wall surface 302 and an outer wall surface 301 on its inner and outer sides, respectively, in combination with... Figure 5 As shown, controlling the radial clearance L2 between the outer wall surface 301 of the floating ring 300 and the inner wall of the ring seat 310 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 can effectively ensure the floating sealing effect of the floating ring 300. This avoids the phenomenon of jamming between the other side of the floating ring 300 and the outer wall of the impeller 200 when one side of the floating ring 300 is closest to the inner wall of the ring seat 310 within the floating range. This reduces wear, noise, and increased leakage of the floating ring 300, improves assembly accuracy, and reduces hydraulic loss.

[0027] Combination Figure 6 As shown, in this embodiment, the radial length L3 of the portion of the floating mouth ring 300 extending beyond the outlet 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 facilitates regular maintenance of the floating mouth ring 300. More specifically, the radial length L3 of the floating mouth ring 300 extending beyond the outlet 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.

[0028] 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.

[0029] 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 7As 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.

[0030] Combination Figure 3 As shown, the mouth ring assembly is in its assembled state. 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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 port ring mounting structure for the suction inlet of a pump unit, comprising a pump body (100), an impeller (200) provided at the suction inlet end of the pump body (100), and a port ring assembly provided at the inlet end of the impeller (200), the port ring assembly providing a radial seal between the impeller (200) and the pump body (100); characterized in that, The mouth ring assembly includes: 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 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) includes an annular frame body (321). The bottom end of the frame body (321) extends inward and connects to the mouth ring seat (310). The top end of the frame body (321) is provided with an outward-turned ring (322). The outward-turned ring (322) extends obliquely towards the outside of the frame body (321). The outermost radial end of the outward-turned ring (322) and the pump assembly surface (101) of the inner wall of the pump body (100) are in line contact interference fit, so that a certain radial gap is maintained between the outer wall surface of the frame body (321) and the pump assembly surface (101).

2. The inlet ring mounting structure for a pump unit suction inlet according to claim 1, characterized in that: The interference fit between the outermost end of the outward-facing ring (322) and the pump mounting surface (101) is between 0.05-0.15 mm on one side.

3. The inlet ring mounting structure for a pump unit suction inlet according to claim 1, characterized in that: The pump body (100) is provided with an assembly groove for installing the mouth ring assembly. The perpendicularity of the frame body (321) to the bottom surface of the assembly groove is within 0.05mm.

4. The inlet ring mounting structure for a pump unit suction inlet according to claim 1, characterized in that: The machining accuracy of the pump assembly surface (101) is ≤Ra3.

2.

5. The inlet ring mounting structure for a pump unit suction inlet according to any one of claims 1-4, characterized in that: 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 smaller than the radial clearance L1 between the inner wall of the floating mouth ring (300) and the outer wall of the impeller (200).

6. The inlet ring mounting structure for a pump unit suction inlet according to any one of claims 1-4, characterized in that: The radial length L3 of the floating mouth ring (300) beyond the mouth ring seat (310) is less than the radial length L4 embedded in the mouth ring seat (310).

7. The inlet ring mounting structure for a pump unit suction inlet according to any one of claims 1-4, characterized in that: 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.

8. The inlet ring mounting structure for a pump unit suction inlet according to any one of claims 1-4, characterized in that: The bottom end of the main body of the skeleton (321) extends radially inward to form an inner mounting ring (323), and the bottom of the mouth ring seat (310) is correspondingly formed with a mounting groove for the inner mounting ring (323) to be fitted in; 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).

9. The inlet ring mounting structure for a pump unit suction inlet according to claim 1, characterized in that: 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).

10. The inlet ring mounting structure of a pump unit according to claim 9, characterized in that: The floating mouth ring (300) is made of plastic with an elastic modulus between 250-300MPa; the outer frame (320) is made of metal with an elastic modulus between 150-200GPa; and the mouth ring seat (310) is made of rubber with an elastic modulus between 5-10MPa.

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