Self-lubricating wear-resistant sheath for screw pump

Abstract

The utility model relates to screw pump sheath technical field, and disclose a kind of screw pump wear-resisting sheath with self-lubricating function;The novel scheme, including rubber inner liner, the outside wall of rubber inner liner is respectively provided with first half body metal sleeve pipe and second half body metal sleeve pipe in front and back two sides, even connection between rubber inner liner and first half body metal sleeve pipe and second half body metal sleeve pipe Limiting pin, the left and right sides of first half body metal sleeve pipe are evenly provided with connecting sleeve, the left and right sides of second half body metal sleeve pipe are evenly provided with internal thread sleeve, bolt is arranged in connecting sleeve, bolt is screwed with internal thread sleeve;The utility model is by with metal sleeve pipe and rubber inner liner can be dismantled design, to this when rubber inner liner wears, without replacing entire sheath, only need to disassemble metal sleeve pipe, remove old inner liner and replace new inner liner, metal outer sleeve pipe can be reused, substantially reduce material consumption and replacement cost.

Description

Technical Field

[0001] This utility model belongs to the field of screw pump sleeve technology, specifically a wear-resistant sleeve for screw pumps with self-lubricating function. Background Technology

[0002] Screw pumps are widely used in petroleum, chemical, and wastewater treatment industries because they can efficiently transport high-viscosity, particulate, or corrosive media. Their core component, the stator, is usually composed of a metal outer sleeve and a rubber inner liner. The rubber inner liner is in direct contact with the screw (rotor) and plays a crucial role in sealing and transporting the media.

[0003] Traditional screw pump sleeves typically feature a one-piece molded structure where the metal outer sleeve and rubber inner liner are directly vulcanized and bonded to the metal sleeve. While this ensures structural stability, it has significant limitations: the rubber inner liner, being a wear component, is prone to wear and aging after prolonged friction with the screw, requiring complete replacement of the sleeve. This results in the metal outer sleeve being scrapped along with the inner liner, leading to low material utilization and high replacement costs. Furthermore, ordinary rubber liners have a high coefficient of friction, accelerating wear when conveying non-lubricating media or media containing particles, necessitating frequent replacement. Therefore, we propose a wear-resistant screw pump sleeve with self-lubricating function. Utility Model Content

[0004] The purpose of this invention is to provide a wear-resistant sleeve for a screw pump with self-lubricating function to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a wear-resistant sleeve for a screw pump with self-lubricating function, comprising a rubber liner, wherein a first half-metal sleeve and a second half-metal sleeve are respectively provided on the front and rear sides of the outer side wall of the rubber liner, and limit pins are uniformly connected between the rubber liner and the first half-metal sleeve and the second half-metal sleeve, connecting sleeves are uniformly provided on the left and right sides of the first half-metal sleeve, and internal threaded sleeves are uniformly provided on the left and right sides of the second half-metal sleeve, wherein bolts are provided in the connecting sleeves and are screwed into the internal threaded sleeves, a set of pull plates is placed on both the left and right sides of the first half-metal sleeve, and pins are uniformly provided on the opposite sides of the two sets of pull plates, wherein the pins are inserted into the connecting sleeves and bolts, and high-strength springs are uniformly provided between the pull plates and the first half-metal sleeve.

[0006] Preferably, the limiting pins are evenly distributed on the opposite sides of the first half-metal sleeve and the second half-metal sleeve, the outer wall of the rubber liner is evenly provided with limiting holes, the limiting pins are inserted into the limiting holes, and the rubber liner is made of rubber-based self-lubricating material.

[0007] Preferably, the outer side of the connecting sleeve has a through hole, and the outer side of the bolt has a locking hole.

[0008] Preferably, the pin is inserted through the through hole into the locking hole, and a magnetic block is embedded on the outer side of the pin.

[0009] Preferably, the magnetic block is magnetically attracted to the locking hole, and storage sleeves are evenly arranged on the left and right sides of the first half-body metal sleeve.

[0010] Preferably, the storage sleeve is located between the first half of the metal sleeve and the pull plate, and the high-strength spring is located inside the storage sleeve.

[0011] Compared with the prior art, the beneficial effects of this utility model are: by designing the metal sleeve and the rubber liner to be detachable, when the rubber liner is worn, it is not necessary to replace the entire sheath. Only the metal sleeve needs to be removed, the old liner can be taken out and a new liner can be replaced. The metal outer sleeve can be reused, which greatly reduces material consumption and replacement costs.

[0012] The rubber liner is made of rubber-based self-lubricating material, which has the characteristics of self-lubrication, low friction and wear resistance. Combined with the detachable design between the rubber liner and the metal sleeve, the two significantly improve the operating stability and economy of the equipment, and are especially suitable for industrial scenarios with high wear and high maintenance costs. Attached Figure Description

[0013] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0014] In the attached diagram:

[0015] Figure 1 This is a schematic diagram of the structure of a wear-resistant sheath for a screw pump with self-lubricating function according to the present invention;

[0016] Figure 2 This is a front sectional view of a wear-resistant sheath for a screw pump with self-lubricating function according to the present invention.

[0017] Figure 3 This is a first right-side sectional view of a wear-resistant sheath for a screw pump with self-lubricating function according to this utility model;

[0018] Figure 4 This is a second right-side sectional view of a wear-resistant sheath for a screw pump with self-lubricating function according to this utility model;

[0019] Figure 5 This is a top cross-sectional view of a wear-resistant sleeve for a screw pump with self-lubricating function according to this utility model.

[0020] In the figure: 1. First half of the metal sleeve; 11. Second half of the metal sleeve; 12. Rubber liner; 13. Connecting sleeve; 14. Internal threaded sleeve; 15. Pull plate; 16. Storage sleeve; 17. High-strength spring; 18. Pin; 19. Magnetic block; 2. Bolt; 21. Limit pin. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-5A wear-resistant sleeve for a screw pump with self-lubricating function includes a rubber liner 12. A first half-metal sleeve 1 and a second half-metal sleeve 11 are slidably disposed on the front and rear sides of the outer side wall of the rubber liner 12, respectively. Limiting pins 21 are uniformly connected between the rubber liner 12 and the first and second half-metal sleeves 11. Connecting sleeves 13 are uniformly fixed on the left and right sides of the first half-metal sleeve 1, and internally threaded sleeves 14 are uniformly fixed on the left and right sides of the second half-metal sleeve 11. Bolts 2 are rotatably disposed within the connecting sleeves 13, and the bolts 2 are screwed into the internally threaded sleeves 14. A set of pull plates 15 is installed on both the left and right sides of the metal sleeve 1. Pins 18 are evenly fixed on opposite sides of the two sets of pull plates 15, and are inserted into the connecting sleeve 13 and bolt 2. High-strength springs 17 are evenly fixed between the pull plates 15 and the first half of the metal sleeve 1. Limiting pins 21 are evenly fixed on opposite sides of the first half of the metal sleeve 1 and the second half of the metal sleeve 11. Limiting holes are evenly formed on the outer wall of the rubber liner 12, and the limiting pins 21 are inserted into these holes. The rubber liner 12 is placed between the first half of the metal sleeve 1 and the second half of the metal sleeve 11, and the limiting pins are positioned accordingly. Pin 21 is inserted into the limiting hole of rubber liner 12, and then bolt 2 is used to thread the connecting sleeve 13 through the threaded sleeve 14 to fix the first half metal sleeve 1 and the second half metal sleeve 11 to the outside of rubber liner 12. The limiting pin 21 stably limits the rubber liner 12 between the first half metal sleeve 1 and the second half metal sleeve 11, so that the first half metal sleeve 1, the second half metal sleeve 11 and the rubber liner 12 form a complete screw pump sleeve. The rubber liner 12 is made of rubber-based self-lubricating material. This is an existing technology. Its principle is to add solid lubricants such as molybdenum disulfide, graphite, and polytetrafluoroethylene powder to the rubber-based self-lubricating liner. During the conveying process, when the screw and the rubber liner 12 rotate relative to each other, friction will be generated on the contact surface. At this time, the self-lubricating filler in the liner will gradually transfer to the contact surface due to the small amount of heat and pressure generated by the friction and form a uniform lubricating film. For example, the sheet-like structure of graphite will slide on the friction surface, and the layered crystals of molybdenum disulfide will achieve "slip lubrication" through the weak attraction between molecules, thereby reducing the friction coefficient of the contact surface and achieving the effects of self-lubrication and improved wear resistance.

[0023] A through hole is provided on the outer side of the connecting sleeve 13, and a locking hole is provided on the outer side of the bolt 2. The pin 18 is inserted into the locking hole through the through hole, and a magnet 19 is embedded on the outer side of the pin 18. The magnet 19 is magnetically attracted into the locking hole. Storage sleeves 16 are evenly fixed on the left and right sides of the first half metal sleeve 1. When the bolt 2 is tightened, the locking hole on the outer side of the bolt 2 will be aligned with the through hole on the outer side of the connecting sleeve 13. At this time, the storage sleeve 16 will use its own elastic force to pull the pin 18 through the through hole into the locking hole through the pull plate 15, thereby locking the bolt 2 in the connecting sleeve 13, thus achieving the effect of preventing loosening of the bolt 2. At the same time, the magnet 16 will also be fixed in place. 9 will be magnetically attracted into the locking hole of bolt 2, thereby improving the insertion stability of pin 18 and ensuring the reliability of bolt 2's anti-loosening fixation. After pulling the pull plate 15 outward to separate pin 18 from bolt 2, bolt 2 can be spirally separated from internal thread sleeve 14. At this time, the first half metal sleeve 1 and the second half metal sleeve 11 can be moved outward to separate and disassemble from rubber liner 12, thereby achieving the replaceability of rubber liner 12 and realizing the recyclability of other parts except rubber liner 12. Storage sleeve 16 is located between the first half metal sleeve 1 and pull plate 15, and high-strength spring 17 is located inside storage sleeve 16.

[0024] Working principle: The rubber liner 12 is placed between the first half-metal sleeve 1 and the second half-metal sleeve 11, and the limiting pin 21 is inserted into the limiting hole of the rubber liner 12. Then, the bolt 2 is used to thread the connecting sleeve 13 through the threaded sleeve 14, thereby fixing the first half-metal sleeve 1 and the second half-metal sleeve 11 to the outside of the rubber liner 12. The limiting pin 21 stably limits the rubber liner 12 between the first half-metal sleeve 1 and the second half-metal sleeve 11, thereby ensuring that the first half-metal sleeve 1 and the second half-metal sleeve 11 are properly positioned. The semi-metal sleeve 11 and the rubber liner 12 constitute a complete screw pump casing. The rubber liner 12, made of a rubber-based self-lubricating material, is existing technology. Its principle involves adding solid lubricants such as molybdenum disulfide, graphite, and polytetrafluoroethylene powder to the rubber-based self-lubricating liner. During the conveying process, when the screw and the rubber liner 12 rotate relative to each other, friction occurs at the contact surface. At this time, the self-lubricating filler in the liner gradually transfers to the contact surface due to the minute heat and pressure generated by friction, forming a uniform lubricating film, such as graphite flakes. The structure will slide on the friction surface, and the layered crystals of molybdenum disulfide achieve "slip lubrication" through weak intermolecular attraction, thereby reducing the friction coefficient of the contact surface, achieving self-lubrication and improving wear resistance. When bolt 2 is tightened, the locking hole on the outside of bolt 2 will be aligned with the through hole on the outside of connecting sleeve 13. At this time, the receiving sleeve 16 will use its own elastic force to drive the pin 18 through the through hole and into the locking hole through the pull plate 15, thereby locking bolt 2 in the connecting sleeve 13, thus achieving the effect of preventing loosening of bolt 2. At the same time, the magnetic Block 19 will be magnetically attracted into the locking hole of bolt 2, thereby improving the insertion stability of pin 18 and ensuring the reliability of bolt 2's anti-loosening fixation. After pulling the pull plate 15 outward to separate pin 18 from bolt 2, bolt 2 can be spirally separated from internal thread sleeve 14. At this time, the first half metal sleeve 1 and the second half metal sleeve 11 can be moved outward to separate and disassemble from rubber liner 12, thereby achieving the replaceability of rubber liner 12 and realizing the recyclability of other parts except rubber liner 12.

Claims

1. A wear-resistant sheath for a screw pump with self-lubricating function, characterized in that, Includes a rubber liner (12), on the front and rear sides of the outer side wall of the rubber liner (12) respectively provided with a first half-metal sleeve (1) and a second half-metal sleeve (11), the rubber liner (12) and the first half-metal sleeve (1) and the second half-metal sleeve (11) are uniformly connected by limit pins (21), the first half-metal sleeve (1) is uniformly provided with connecting sleeves (13) on the left and right sides, and the second half-metal sleeve (11) is uniformly provided with internal threads on the left and right sides. The connecting sleeve (13) is provided with a bolt (2), which is screwed to the internal thread sleeve (14). A set of pull plates (15) is placed on both the left and right sides of the first half metal sleeve (1). Pins (18) are evenly arranged on the opposite sides of the two sets of pull plates (15). The pins (18) are inserted into the connecting sleeve (13) and the bolt (2). High-strength springs (17) are evenly arranged between the pull plates (15) and the first half metal sleeve (1).

2. The wear-resistant sheath for a screw pump with self-lubricating function according to claim 1, characterized in that: The limiting pins (21) are evenly arranged on the opposite sides of the first half metal sleeve (1) and the second half metal sleeve (11). The outer side wall of the rubber liner (12) is evenly provided with limiting holes. The limiting pins (21) are inserted into the limiting holes. The material of the rubber liner (12) is rubber-based self-lubricating material.

3. The wear-resistant sheath for a screw pump with self-lubricating function according to claim 1, characterized in that: The outer side of the connecting sleeve (13) has a through hole, and the outer side of the bolt (2) has a locking hole.

4. The wear-resistant sleeve for a screw pump with self-lubricating function according to claim 3, characterized in that: The pin (18) is inserted into the locking hole through the through hole, and a magnet (19) is embedded on the outside of the pin (18).

5. The wear-resistant sheath for a screw pump with self-lubricating function according to claim 4, characterized in that: The magnetic block (19) is magnetically attracted in the locking hole, and storage sleeves (16) are evenly arranged on the left and right sides of the first half metal sleeve (1).

6. The wear-resistant sleeve for a screw pump with self-lubricating function according to claim 5, characterized in that: The storage sleeve (16) is located between the first half metal sleeve (1) and the pull plate (15), and the high-strength spring (17) is located inside the storage sleeve (16).

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