A centrifugal pump impeller metal insert sleeve mechanism

Abstract

This utility model relates to the field of centrifugal pump impeller processing technology, and proposes a metal insert sleeve mechanism for centrifugal pump impellers, including a cabinet and a metal insert. The metal insert includes a metal impeller and a fluoroplastic upper shell and a fluoroplastic lower shell that match the metal impeller. A support ring for supporting the metal insert is fixed inside the cabinet. An upper mold is provided above the support ring, and a sleeve mechanism for inserting the metal insert is provided inside the support ring. The sleeve mechanism is driven to rise by a cylinder, realizing automatic alignment and extrusion molding of the metal impeller and the fluoroplastic upper and lower shells, reducing manual operation steps. A spring is sleeved outside the small cylindrical section of the guide sleeve, and the upper and lower ends abut against the frustum section and the tray respectively, forming a buffer pressure during the pressing process. The elastic deformation of the spring is linked with the stroke of the cylinder to prevent the metal insert from being damaged due to excessive pressure, while ensuring that the fluoroplastic shell is uniformly pressed to improve sealing, shorten molding time, and improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump impeller processing technology, specifically to a metal insert sleeve mechanism for centrifugal pump impellers. Background Technology

[0002] Fluoroplastic alloy centrifugal pumps currently utilize advanced mechanical seals. Their characteristics include compensating for radial runout of the pump shaft, externally mounted seals for easy installation and removal, intuitive operation status monitoring, excellent corrosion and wear resistance, multi-layer protection, and extended seal life. For conveying corrosive media containing impurities and particles, a waterless, single-end hard-to-hard (silicon carbide to silicon carbide) mechanical seal can be used. For strong alkalis and hydrofluoric acid, pressureless sintered silicon carbide seals are used. For example, CN106286376A discloses a fluoroplastic alloy centrifugal pump. This centrifugal pump includes: a pump body, oil cover, impeller, oil sight glass, rear cover, bearing, gland, bearing gland, seals, coupling, bracket, lifting bolts, and pump shaft. The pump cover, impeller, and shaft sleeve are all integrally sintered and pressed using metal inserts encased in fluoroplastic. In the traditional centrifugal pump impeller metal insert pressing device, since the metal insert is formed by pressing a metal impeller and a matching fluoroplastic upper shell and fluoroplastic lower shell, the fluoroplastic lower shell, metal impeller and fluoroplastic upper shell need to be manually placed in the mold in sequence before pressing. Due to human error, accurate alignment cannot be achieved, and the coaxiality error affects the accuracy of mold closing. In addition, one-time pressing can easily cause the metal insert to be damaged due to excessive pressure, affecting its sealing performance. Utility Model Content

[0003] This invention proposes a metal insert sleeve mechanism for centrifugal pump impellers, which solves the problems of low efficiency of manual operation and easy damage to metal inserts due to excessive pressure in the prior art.

[0004] The technical solution of this utility model is as follows: A centrifugal pump impeller metal insert sleeve mechanism includes a cabinet and a metal insert. The metal insert includes a metal impeller and a fluoroplastic upper shell and a fluoroplastic lower shell that match the metal impeller. A support ring for supporting the metal insert is fixed inside the cabinet. An upper mold is provided above the support ring. A sleeve mechanism for inserting the metal insert is provided inside the support ring. A cylinder for driving the sleeve mechanism to lift the metal insert and extrude it with the upper mold is fixed inside the bottom of the cabinet.

[0005] The sleeve mechanism includes a lower mold and a sleeve rod assembly that can extend and retract relative to the lower mold;

[0006] The sleeve rod assembly includes a guide sleeve that slides with the lower die, a sleeve rod installed on the sleeve rod assembly, and a spring that elastically connects the guide sleeve and the lower die.

[0007] Preferably, the lower mold includes a tray, and a mounting plate is fixed to the bottom of the tray, the mounting plate being fixed to the piston rod end of the cylinder.

[0008] Preferably, the lower mold can pass vertically through the ring, while the fluoroplastic lower shell cannot pass vertically through the ring.

[0009] Preferably, the guide sleeve includes a small cylindrical section, the top of which is provided with a frustum section that can fit into the conical concave surface at the bottom of the fluoroplastic lower shell, and the bottom of which is provided with a large cylindrical section that is limited to the mounting plate.

[0010] Preferably, the spring is sleeved outside the small cylindrical section, with the upper end of the spring abutting the bottom surface of the frustum section and the lower end of the spring abutting the top surface of the tray.

[0011] Preferably, the guide sleeve has a guide cavity along its axial direction, the bottom of the guide cavity has an flared mounting hole, and the top two sides of the guide cavity have slots.

[0012] Preferably, the sleeve includes a slide rod and a pressure cap. The slide rod slides through the guide cavity. A stop ring is provided on the outer side of the bottom of the slide rod. An external thread is provided on the slide rod below the stop ring, which is threaded to the pressure cap. A stop pin is laterally fixed through the middle of the slide rod.

[0013] Preferably, the two ends of the stop pin are respectively engaged in the slots on both sides of the top of the guide cavity.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. In this utility model, the guide sleeve adopts a three-section structure of small cylindrical section + frustum section + large cylindrical section. The frustum section fits into the conical concave surface at the bottom of the fluoroplastic lower shell and provides guidance in conjunction with the slide rod to improve assembly efficiency. The large cylindrical section is limited by the mounting plate to ensure the stability of the guide sleeve during the compression process.

[0016] 2. In this utility model, by designing the size difference between the lower mold and the support ring, the lower mold can move vertically through the support ring, while the fluoroplastic lower shell cannot pass through the support ring due to size limitations. After this design is realized, the cylinder drives the lower mold to descend, the metal insert first disengages from the lower mold, and then the frustum section of the guide sleeve separates from the fluoroplastic lower shell, so that demolding can be completed without manual intervention.

[0017] 3. In this utility model, the sleeve mechanism is driven by a cylinder to rise, realizing the automatic alignment and extrusion molding of the metal impeller and the upper and lower fluoroplastic shells, reducing manual operation steps. The spring is sleeved outside the small cylindrical section of the guide sleeve, and the upper and lower ends abut against the frustum section and the tray respectively, forming a buffer pressure during the pressing process. The elastic deformation of the spring is linked with the stroke of the cylinder to avoid damage to the metal insert due to excessive pressure, while ensuring that the fluoroplastic shell is uniformly pressed, thereby improving the sealing performance, shortening the molding time, and improving production efficiency. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a schematic diagram of the overall structure of the cabinet proposed in this utility model;

[0020] Figure 2 This is a schematic diagram of the sleeve mechanism, support ring, and metal insert structure proposed in this utility model;

[0021] Figure 3 This is a schematic cross-sectional view of the sleeve mechanism proposed in this utility model;

[0022] Figure 4 This is a schematic diagram of the disassembly structure of the sleeve mechanism proposed in this utility model;

[0023] Figure 5 This is a schematic diagram of the half-section structure of the lower mold proposed in this utility model;

[0024] Figure 6 This is a schematic diagram of the half-section structure of the guide sleeve proposed in this utility model;

[0025] Figure 7 This is a schematic diagram of the disassembly structure of the sleeve rod proposed in this utility model;

[0026] In the diagram: 1. Cabinet; 2. Support ring; 3. Upper mold; 4. Sleeving mechanism; 41. Lower mold; 411. Tray; 412. Mounting plate; 42. Through-sleeve rod assembly; 421. Guide sleeve; 4211. Small cylindrical section; 4212. Frustum section; 4213. Large cylindrical section; 4214. Guide cavity; 4215. Mounting hole; 4216. Slot; 4222. Sleeve rod; 4221. Slide rod; 4222. Pressure cap; 4223. Stop ring; 4224. External thread; 4225. Stop pin; 423. Spring; 5. Cylinder; 6. Metal insert; 61. Metal impeller; 62. Fluoroplastic upper shell; 63. Fluoroplastic lower shell. Detailed Implementation

[0027] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0028] Please see Figure 1 and Figure 2 This utility model provides a technical solution: a centrifugal pump impeller metal insert sleeve mechanism, including a cabinet 1 and a metal insert 6. The metal insert 6 includes a metal impeller 61, and a fluoroplastic upper shell 62 and a fluoroplastic lower shell 63 that are matched with the metal impeller 61. A support ring 2 for supporting the metal insert 6 is fixed inside the cabinet 1. An upper mold 3 is provided above the support ring 2. A sleeve mechanism 4 for sleeve the metal insert 6 is provided inside the support ring 2. A cylinder 5 for driving the sleeve mechanism 4 to lift the metal insert 6 and extrude it with the upper mold 3 is fixed inside the bottom of the cabinet 1.

[0029] Please see Figure 3 and Figure 4 The sleeve mechanism 4 includes a lower mold 41 and a sleeve rod assembly 42 that can extend and retract relative to the lower mold 41. The sleeve rod assembly 42 includes a guide sleeve 421 that slides with the lower mold 41, a sleeve rod 422 mounted on the sleeve rod assembly 42, and a spring 423 that elastically connects the guide sleeve 421 and the lower mold 41.

[0030] Please see Figure 5 The lower mold 41 includes a tray 411, and a mounting plate 412 is fixed to the bottom of the tray 411. The mounting plate 412 is fixed to the piston rod end of the cylinder 5. The lower mold 41 can pass vertically through the ring 2, while the fluoroplastic lower shell 63 cannot pass vertically through the ring 2. The lower mold 41 can move vertically through the ring 2, while the fluoroplastic lower shell 63 cannot pass through the ring due to size limitations. After this design is implemented, the cylinder 5 drives the lower mold to descend, the metal insert first disengages from the lower mold, and then the frustum section of the guide sleeve separates from the fluoroplastic lower shell. Demolding can be completed without manual intervention.

[0031] Please see Figure 6The guide sleeve 421 includes a small cylindrical section 4211. The top of the small cylindrical section 4211 is provided with a frustum section 4212 that can fit with the conical concave surface of the bottom of the fluoroplastic lower shell 63. The bottom of the small cylindrical section 4211 is provided with a large cylindrical section 4213 that is limited within the mounting plate 412. The frustum section 4212 fits with the conical concave surface of the bottom of the fluoroplastic lower shell 63 and provides a guiding function in conjunction with the slide rod 4221 to improve assembly efficiency. The large cylindrical section 4213 is limited by the mounting plate 412 to ensure the stability of the guide sleeve during the compression process. The spring 423 is sleeved on the outside of the small cylindrical section 4211. The upper end of the spring 423 abuts against the bottom surface of the frustum section 4212, and the lower end of the spring 423 abuts against the top surface of the tray 411. During the pressing process, a buffer pressure is formed to prevent the metal insert from being damaged due to excessive pressure. At the same time, it ensures that the fluoroplastic shell is evenly compressed to improve the sealing performance. The guide sleeve 421 has a guide cavity 4214 along its axial direction. The bottom of the guide cavity 4214 has an flared mounting hole 4215, and the top two sides of the guide cavity 4214 have slots 4216.

[0032] Please see Figure 7 The sleeve 422 includes a slide rod 4221 and a pressure cap 4222. The slide rod 4221 slides through the guide cavity 4214. A stop ring 4223 is provided on the outer bottom of the slide rod 4221. The slide rod 4221 below the stop ring 4223 is provided with an external thread 4224 that is threaded to the pressure cap 4222. The sleeve 422 is connected to the pressure cap 4222 through the thread 4224, which facilitates the replacement of sleeves of different specifications to adapt to metal inserts of different sizes. A stop pin 4225 is horizontally fixed through the middle of the slide rod 4221. The two ends of the stop pin 4225 are respectively locked in the slots 4216 on both sides of the top of the guide cavity 4214. The sleeve 422 cooperates with the slots 4216 of the guide sleeve 421 through the stop pin 4225 to prevent the sleeve 422 from shifting during movement and to ensure the precise disengagement of the guide sleeve 421 from the fluoroplastic lower shell 63 during demolding.

[0033] The working principle and usage process of this utility model are as follows: During processing, the fluoroplastic lower shell 63, metal impeller 61, and fluoroplastic upper shell 62 are sequentially placed outside the sleeve rod assembly 42 and supported by the support ring 2. Then, the cylinder 5 drives the sleeve mechanism 4 to support the metal insert 6 inside the support ring 2 and move it upward until it comes into contact with the upper mold 3. Under the mutual extrusion of the lower mold 41 and the upper mold 3, the fluoroplastic lower shell 63, metal impeller 61, and fluoroplastic upper shell 62 are pressed into shape.

[0034] During the upward movement of the aforementioned sleeve mechanism 4, the frustum section 4212 of the guide sleeve 421 first contacts the bottom conical concave surface of the fluoroplastic lower shell 63. At this time, the overall weight of the metal insert 6 causes the spring 423 to be compressed. Under this compression, the tray 411 and the bottom surface of the fluoroplastic lower shell 63 still maintain a certain gap. After the top surface of the fluoroplastic upper shell 62 contacts the upper mold 3, the spring 423 begins to compress further, causing the tray 411 to contact the bottom surface of the fluoroplastic lower shell 63. The metal insert 6 is formed by the mutual extrusion of the tray 411 and the upper mold 3.

[0035] After molding, the cylinder 5 drives the sleeve mechanism 4 to descend. Since the lower mold 41 can pass vertically through the ring 2, while the fluoroplastic lower shell 63 cannot pass vertically through the ring 2, the metal insert 6 can first detach from the lower mold 41. The frustum section 4212 at the top of the guide sleeve 421 then detaches from the bottom conical concave surface of the fluoroplastic lower shell 63 after being limited by the large cylindrical section 4213 in the mounting plate 412, thereby demolding the metal insert 6 in the ring 2.

[0036] This technical solution solves the problems of low assembly accuracy, difficult demolding, and insufficient efficiency in traditional processes through structural optimization, elastic buffering, modular design, and automated demolding mechanism. At the same time, it improves the sealing and durability of the product and is suitable for high-efficiency, mass production scenarios.

[0037] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A centrifugal pump impeller metal insert housing mechanism, comprising a cabinet (1) and a metal insert (6), wherein the metal insert (6) comprises a metal impeller (61), and a fluoroplastic upper shell (62) and a fluoroplastic lower shell (63) matching the metal impeller (61), characterized in that, The cabinet (1) is fixed with a support ring (2) for supporting the metal insert (6). An upper mold (3) is provided above the support ring (2). A sleeve mechanism (4) for inserting the metal insert (6) is provided inside the support ring (2). A cylinder (5) is fixed on the bottom inner side of the cabinet (1) for driving the sleeve mechanism (4) to lift the metal insert (6) and extrude it with the upper mold (3). The sleeve mechanism (4) includes a lower mold (41) and a sleeve rod assembly (42) that can extend and retract relative to the lower mold (41). The sleeve rod assembly (42) includes a guide sleeve (421) that slides with the lower mold (41), a sleeve rod (422) installed on the sleeve rod assembly (42), and a spring (423) that elastically connects the guide sleeve (421) and the lower mold (41).

2. The impeller metal insert sleeve mechanism for a centrifugal pump according to claim 1, characterized in that, The lower mold (41) includes a tray (411), and a mounting plate (412) is fixed to the bottom of the tray (411). The mounting plate (412) is fixed to the piston rod end of the cylinder (5).

3. The impeller metal insert sleeve mechanism for a centrifugal pump according to claim 2, characterized in that, The lower mold (41) can pass vertically through the ring (2), while the fluoroplastic lower shell (63) cannot pass vertically through the ring (2).

4. The impeller metal insert sleeve mechanism for a centrifugal pump according to claim 2, characterized in that, The guide sleeve (421) includes a small cylindrical section (4211), the top of which is provided with a frustum section (4212) that can fit with the conical concave surface at the bottom of the fluoroplastic lower shell (63), and the bottom of which is provided with a large cylindrical section (4213) that is limited to the mounting plate (412).

5. The impeller metal insert sleeve mechanism for a centrifugal pump according to claim 4, characterized in that, The spring (423) is sleeved on the outside of the small cylindrical section (4211), the upper end of the spring (423) abuts against the bottom surface of the frustum section (4212), and the lower end of the spring (423) abuts against the top surface of the tray (411).

6. The impeller metal insert sleeve mechanism for a centrifugal pump according to claim 4, characterized in that, The guide sleeve (421) has a guide cavity (4214) along its axial direction. The bottom of the guide cavity (4214) has an flared mounting hole (4215), and the top two sides of the guide cavity (4214) have slots (4216).

7. The impeller metal insert sleeve mechanism for a centrifugal pump according to claim 6, characterized in that, The sleeve (422) includes a slide rod (4221) and a pressure cap (4222). The slide rod (4221) slides through the guide cavity (4214). A stop ring (4223) is provided on the outer side of the bottom of the slide rod (4221). An external thread (4224) is provided on the slide rod (4221) below the stop ring (4223) and is threaded to the pressure cap (4222). A stop pin (4225) is fixedly inserted through the middle of the slide rod (4221) laterally.

8. The impeller metal insert sleeve mechanism for a centrifugal pump according to claim 7, characterized in that, The two ends of the stop pin (4225) are respectively engaged in the slots (4216) on both sides of the top of the guide cavity (4214).

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