A double helix rotor pump seal structure

Abstract

The utility model discloses a double helix rotor pump sealing structure, including double helix rotor pump pump shell and bearing end cap, the four corners of double helix rotor pump pump shell left side and the four corners of bearing end cap all are equipped with the threaded hole, and the inside screw thread connection of threaded hole has the lock bolt, the central of bearing end cap is equipped with the round hole, the inside fixed connection of round hole has the first sealing bearing, the utility model discloses through the setting of first sealing bearing, first sealing cylinder, U -shaped sealing ring, second sealing cylinder, conical sealing ring, convex sealing ring etc. Multiple sealing structure, formed multilayer sealing defense line, first sealing bearing has guaranteed the smoothness of axle rod rotation and prevented medium from leaking from axle rod simultaneously, conical sealing ring and second embedding groove are pasted, convex sealing ring and first embedding groove are pasted, further strengthened the sealing effect, reduced the risk of medium leakage, improved the work efficiency of pump and the safety of conveying medium.

Description

Technical Field

[0001] This utility model relates to the field of double helical rotor pump technology, specifically a sealing structure for a double helical rotor pump. Background Technology

[0002] Twin-helix rotor pumps, as important fluid transport equipment, are widely used in many industrial fields such as chemical, food, and pharmaceutical industries. Their working principle relies on the rotation of a pair of meshing helical rotors within the pump casing to achieve the suction, compression, and discharge of fluids. During the operation of the twin-helix rotor pump, the seal between the pump casing and the bearing end cover is a critical factor in ensuring the normal operation of the pump, directly affecting its efficiency, service life, and the safety of the transported medium.

[0003] In traditional twin-helix rotor pump designs, some twin-helix rotor pumps use ordinary bolts to connect the pump casing and bearing end cover. During long-term operation, due to pump body vibration and changes in medium pressure, the bolts are prone to loosening, leading to a decrease in sealing performance and medium leakage. Some twin-helix rotor pumps also use simple gaskets to seal between the pump casing and bearing end cover. When dealing with high pressure, high speed, and corrosive media, the sealing performance is often difficult to meet the requirements.

[0004] Therefore, it is necessary to modify it by setting up a first sealing bearing, sealing cylinder, sealing ring and other multiple sealing structures to enhance the sealing performance, increase the adaptability of the sealing structure and reduce the risk of leakage. Utility Model Content

[0005] To address the problems mentioned in the background art, the purpose of this utility model is to provide a double helical rotor pump sealing structure that has the advantages of enhanced sealing performance, increased adaptability of the sealing structure, and reduced leakage risk.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a sealing structure for a double-helix rotor pump, comprising a double-helix rotor pump housing and a bearing end cover. Threaded holes are provided at the four corners of the left side of the double-helix rotor pump housing and at the four corners of the bearing end cover, and anti-loosening bolts are threaded into the internal threads of the threaded holes. A circular hole is provided in the center of the bearing end cover, and a first sealing bearing is fixedly connected inside the circular hole. A shaft is fixedly connected inside the first sealing bearing. A first sealing cylinder, sleeved on the surface of the shaft, is fixedly connected to the right side of the bearing end cover. A first embedding groove is provided at the right end of the first sealing cylinder, and a second embedding groove is provided on the right side of the inner wall of the first sealing cylinder. A fixing retaining ring is fixedly connected to the left side of the inner wall of the first sealing cylinder. A U-shaped sealing ring is fixedly connected inside the sealing cylinder. The left side of the U-shaped sealing ring is fixedly connected to the right side of the fixed retaining ring. The left side of the double helical rotor pump casing is connected to a second sealing cylinder. A sealing gasket is fixedly connected to the right side of the second sealing cylinder. The surface of the sealing gasket is in contact with the inner wall of the double helical rotor pump casing. The outer surface of the second sealing cylinder is bonded to the inner wall of the first sealing cylinder. A conical sealing ring is fixedly connected to the outer surface of the second sealing cylinder. The surface of the conical sealing ring is bonded to the inner wall of the second embedding groove. An annular groove located outside the second sealing cylinder is opened on the left side of the double helical rotor pump casing. A protruding sealing ring is fixedly connected inside the annular groove. The surface of the protruding sealing ring is bonded to the inner wall of the first embedding groove.

[0007] As a preferred embodiment of this utility model, a bearing sealing cover is fitted on the left side of the shaft surface. The bearing sealing cover is fixedly connected to the left side of the bearing end cover by bolts. A second sealing bearing is fixedly connected inside the bearing sealing cover. The inner ring of the second sealing bearing is fixedly connected to the surface of the shaft. The inside of the bearing sealing cover is filled with waterproof grease.

[0008] As a preferred embodiment of this utility model, the surface of the sealing gasket ring is provided with a plurality of evenly distributed through holes, and an expansion column is fixedly connected inside the through holes. An inner retaining ring is fixedly connected to the right side of the expansion column. The surface of the inner retaining ring is fixedly connected to the inner wall of the pump casing of the double helical rotor pump. An inwardly inclined slope is provided on the right side of the inner retaining ring.

[0009] As a preferred embodiment of this utility model, damping contraction rods are fixedly connected to the four corners of the right side of the bearing end cover. The right end of the damping contraction rod is fixedly connected to the left side of the double helical rotor pump housing. A stabilizing spring is sleeved on the surface of the damping contraction rod. The left and right ends of the stabilizing spring are respectively attached to the right side of the bearing end cover and the left side of the double helical rotor pump housing.

[0010] As a preferred embodiment of this invention, the left end of the second sealing cylinder is provided with an inner concave ring, the surface of which fits against the interior of the U-shaped sealing ring.

[0011] As a preferred embodiment of this utility model, a stabilizing frame is fixedly connected to the right side inside the pump casing of the double helical rotor pump, and a third sealed bearing is fixedly connected inside the stabilizing frame. The right end of the shaft passes through the third sealed bearing and is fixedly connected to its inner ring.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model effectively avoids bolt loosening caused by pump body vibration and changes in medium pressure by using anti-loosening bolts, ensuring the stability of the connection between the pump casing and the bearing end cover, thereby maintaining a good sealing foundation. The multiple sealing structures, including the first sealing bearing, the first sealing cylinder, the U-shaped sealing ring, the second sealing cylinder, the conical sealing ring, and the protruding sealing ring, form a multi-layered sealing defense. The first sealing bearing ensures the smooth rotation of the shaft while preventing medium leakage from the shaft. The conical sealing ring fits into the second embedded groove, and the protruding sealing ring fits into the first embedded groove, further enhancing the sealing effect, reducing the risk of medium leakage, and improving the pump's working efficiency and the safety of the transported medium.

[0013] 2. This utility model provides additional protection for the shaft by setting a bearing sealing cover fitted on the left side of the shaft surface and fixing it to the bearing end cover with bolts. The setting of the second sealed bearing not only ensures the stability of the shaft rotation but also further enhances the sealing performance at the shaft. The waterproof grease filled inside the bearing sealing cover can prevent moisture from entering the bearing, avoiding rust and damage, and extending the bearing's service life. On the other hand, the grease can reduce the frictional resistance during shaft rotation, reduce energy loss, make the pump run more smoothly, and improve the overall performance and reliability of the pump. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the rear view structure of this utility model; Figure 3 This is a frontal sectional view of the present invention. Figure 4 This is a schematic diagram of the anatomical structure of this utility model.

[0015] In the diagram: 1. Double helical rotor pump casing; 2. Bearing end cover; 3. Anti-loosening bolt; 4. First sealed bearing; 5. Shaft; 6. First sealing cylinder; 7. Fixed retaining ring; 8. U-shaped sealing ring; 9. Second sealing cylinder; 10. Sealing gasket ring; 11. Conical sealing ring; 12. Protruding sealing ring; 13. Bearing sealing cover; 14. Second sealed bearing; 15. Expansion column; 16. Inner retaining ring; 17. Damping contraction rod; 18. Stabilizing spring; 19. Inner concave ring; 20. Stabilizing frame; 21. Third sealed bearing. Detailed Implementation

[0016] 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.

[0017] like Figures 1 to 4 As shown, the present invention provides a sealing structure for a double-helix rotor pump, including a double-helix rotor pump housing 1 and a bearing end cover 2. Threaded holes are provided at the four corners of the left side of the double-helix rotor pump housing 1 and at the four corners of the bearing end cover 2, and anti-loosening bolts 3 are threaded into the internal threads of these holes. A circular hole is provided in the center of the bearing end cover 2, and a first sealing bearing 4 is fixedly connected inside the circular hole. A shaft 5 is fixedly connected inside the first sealing bearing 4. A first sealing cylinder 6, sleeved on the surface of the shaft 5, is fixedly connected to the right side of the bearing end cover 2. A first embedding groove is provided at the right end of the first sealing cylinder 6, and a second embedding groove is provided on the right side of the inner wall of the first sealing cylinder 6. A fixing retaining ring 7 is fixedly connected to the left side of the inner wall of the first sealing cylinder 6. The internal fixing of the first sealing cylinder 6... A U-shaped sealing ring 8 is connected, with its left side fixedly connected to the right side of a fixed retaining ring 7. A second sealing cylinder 9 is connected to the left side of the double helical rotor pump housing 1, and a sealing gasket 10 is fixedly connected to the right side of the second sealing cylinder 9. The surface of the sealing gasket 10 is in contact with the inner wall of the double helical rotor pump housing 1. The outer surface of the second sealing cylinder 9 is bonded to the inner wall of the first sealing cylinder 6. A conical sealing ring 11 is fixedly connected to the outer surface of the second sealing cylinder 9, and its surface is bonded to the inner wall of the second embedded groove. An annular groove located outside the second sealing cylinder 9 is opened on the left side of the double helical rotor pump housing 1. A protruding sealing ring 12 is fixedly connected inside the annular groove, and its surface is bonded to the inner wall of the first embedded groove.

[0018] refer to Figure 3 A bearing seal cover 13 is fitted on the left side of the surface of the shaft 5. The bearing seal cover 13 is fixedly connected to the left side of the bearing end cover 2 by bolts. A second sealing bearing 14 is fixedly connected inside the bearing seal cover 13. The inner ring of the second sealing bearing 14 is fixedly connected to the surface of the shaft 5. The inside of the bearing seal cover 13 is filled with waterproof grease.

[0019] As a technical optimization of this utility model, the bearing sealing cover 13 fitted on the left side of the shaft 5 provides additional protection for the shaft 5. The second sealed bearing 14 not only ensures the stability of the shaft 5's rotation but also further enhances the sealing performance at the shaft 5. The waterproof grease filled inside the bearing sealing cover 13 can prevent moisture from entering the bearing, avoiding rust and damage, and extending the bearing's service life. On the other hand, the grease can reduce the frictional resistance when the shaft 5 rotates, reduce energy loss, make the pump run more smoothly, and improve the overall performance and reliability of the pump.

[0020] refer to Figure 4 The sealing gasket 10 has several evenly distributed through holes on its surface, and an expansion column 15 is fixedly connected inside the through holes. An inner retaining ring 16 is fixedly connected to the right side of the expansion column 15. The surface of the inner retaining ring 16 is fixedly connected to the inner wall of the double helical rotor pump housing 1. An inwardly inclined slope is provided on the right side of the inner retaining ring 16.

[0021] As a technical optimization of this utility model, by setting the through hole on the surface of the sealing gasket 10, the expansion column 15 fixed inside, and the inner retaining ring 16, when the medium transported by the pump has a certain pressure or special properties, the expansion column 15 will expand due to the action of the medium, further filling the gap between the sealing gasket 10 and the inner wall of the pump casing, and enhancing the sealing effect; the inward slope design on the right side of the inner retaining ring 16 can guide the flow direction of the medium, reduce the direct impact of the medium on the sealing gasket 10, reduce the possibility of damage to the sealing gasket 10, and extend the service life of the sealing gasket 10, thereby ensuring the sealing stability and reliability of the pump under different operating conditions.

[0022] refer to Figure 1 Damping contraction rods 17 are fixedly connected to the four corners on the right side of the bearing end cover 2. The right end of the damping contraction rod 17 is fixedly connected to the left side of the double helical rotor pump housing 1. A stabilizing spring 18 is sleeved on the surface of the damping contraction rod 17. The left and right ends of the stabilizing spring 18 are respectively attached to the right side of the bearing end cover 2 and the left side of the double helical rotor pump housing 1.

[0023] As a technical optimization of this utility model, by setting a damping contraction rod 17 and a stabilizing spring 18, the damping contraction rod 17 can absorb the vibration energy generated during the operation of the pump body, reduce the impact of vibration on the connection between the pump casing and the bearing end cover 2, and prevent the sealing structure from loosening and being damaged due to vibration; the stabilizing spring 18 is sleeved on the surface of the damping contraction rod 17, with its left and right ends respectively in contact with the bearing end cover 2 and the pump casing, which can provide a certain elastic support force, making the connection between the pump casing and the bearing end cover 2 tighter and more stable; when the pump body is subjected to external impact or changes in medium pressure, the stabilizing spring 18 can play a buffering role, maintain the integrity of the sealing structure, and further improve the sealing performance and operational stability of the pump.

[0024] refer to Figure 3 The left end of the second sealing cylinder 9 is provided with an inner concave ring 19, the surface of which fits against the inside of the U-shaped sealing ring 8.

[0025] As a technical optimization of this utility model, by setting the inner concave ring 19 to fit inside the U-shaped sealing ring 8, the sealing effect between the second sealing cylinder 9 and the U-shaped sealing ring 8 is further enhanced. The tight fit between the inner concave ring 19 and the U-shaped sealing ring 8 forms a tighter sealing area, which can effectively prevent the medium from leaking from the connection between the second sealing cylinder 9 and the U-shaped sealing ring 8. At the same time, this fitting method can also reduce the gap between sealing components, reduce the scouring and wear of the sealing components by the medium, extend the service life of the sealing components, and improve the overall sealing performance and reliability of the pump.

[0026] refer to Figure 2 A stabilizer 20 is fixedly connected to the right side inside the pump casing 1 of the double helical rotor pump. A third sealed bearing 21 is fixedly connected inside the stabilizer 20. The right end of the shaft 5 passes through the third sealed bearing 21 and is fixedly connected to its inner ring.

[0027] As a technical optimization of this utility model, by setting a stabilizer 20 and a third sealing bearing 21, the stabilizer 20 provides a stable support structure for the third sealing bearing 21. The third sealing bearing 21 cooperates with the right end of the shaft 5, which can further enhance the rotational stability of the shaft 5. During the operation of the pump, the shaft 5 will be subjected to various forces. The third sealing bearing 21 can withstand these forces, reduce the shaking and offset of the shaft 5, ensure the normal rotation of the shaft 5, help improve the working efficiency of the pump, reduce the impact of the shaking of the shaft 5 on the sealing structure, maintain the stability of the sealing structure, and thus improve the sealing performance and service life of the pump.

[0028] The working principle and usage process of this utility model are as follows: First, the pump casing and bearing end cover 2 are securely connected by anti-loosening bolts 3 to prevent the bolts from loosening due to pump body vibration and changes in medium pressure, ensuring connection stability. The shaft 5 passes through the first sealed bearing 4, which is fixed in the central circular hole of the bearing end cover 2, ensuring smooth rotation of the shaft 5 and preventing medium leakage from the shaft 5. The first sealing cylinder 6 is sleeved on the surface of the shaft 5, and its internal U-shaped sealing ring 8 cooperates with the fixed retaining ring 7 to prevent medium from seeping into the bearing end cover 2. The second sealing cylinder 9 is connected to the left side of the pump casing, and its outer surface tapered sealing ring 11 fits into the second embedded groove on the inner wall of the first sealing cylinder 6. The protruding sealing ring 12 in the annular groove on the left side of the rotary sub-pump casing 1 fits into the first embedded groove on the right end of the first sealing cylinder 6, forming multiple sealing defenses and reducing the risk of media leakage. The bearing sealing cover 13 fitted on the left side of the shaft 5 is fixed to the bearing end cover 2 by bolts. The second sealing bearing 14 inside and the waterproof grease filling it ensure the stable rotation of the shaft 5. The expansion column 15 on the surface of the sealing gasket 10 expands under the action of the medium, filling the gap with the inner wall of the pump casing. The slope on the right side of the inner retaining ring 16 guides the direction of medium flow and reduces the possibility of damage to the sealing gasket 10. The concave ring 19 on the left end of the second sealing cylinder 9 fits into the inside of the U-shaped sealing ring 8, further enhancing the sealing effect.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealing structure for a double-helix rotor pump, comprising a double-helix rotor pump housing (1) and a bearing end cover (2), characterized in that: The four corners on the left side of the double helical rotor pump casing (1) and the four corners of the bearing end cover (2) are provided with threaded holes, and anti-loosening bolts (3) are threaded inside the threaded holes. A circular hole is provided in the center of the bearing end cover (2), and a first sealing bearing (4) is fixedly connected inside the circular hole. A shaft (5) is fixedly connected inside the first sealing bearing (4). A first sealing cylinder (6) fitted onto the surface of the shaft (5) is fixedly connected to the right side of the bearing end cover (2). A first embedding groove is provided at the right end of the first sealing cylinder (6), and a second embedding groove is provided on the right side of the inner wall of the first sealing cylinder (6). A fixed retaining ring (7) is fixedly connected to the left side of the inner wall of the first sealing cylinder (6), and a U-shaped sealing ring (8) is fixedly connected inside the first sealing cylinder (6). The left side of the U-shaped sealing ring (8) The right side of the double helical rotor pump housing (1) is fixedly connected to the fixed retaining ring (7). The left side of the double helical rotor pump housing (1) is connected to the second sealing cylinder (9). The right side of the second sealing cylinder (9) is fixedly connected to the sealing gasket (10). The surface of the sealing gasket (10) is in contact with the inner wall of the double helical rotor pump housing (1). The outer surface of the second sealing cylinder (9) is bonded to the inner wall of the first sealing cylinder (6). The outer surface of the second sealing cylinder (9) is fixedly connected to the conical sealing ring (11). The surface of the conical sealing ring (11) is bonded to the inner wall of the second embedding groove. The left side of the double helical rotor pump housing (1) is provided with an annular groove located outside the second sealing cylinder (9). The inside of the annular groove is fixedly connected to a protruding sealing ring (12). The surface of the protruding sealing ring (12) is bonded to the inner wall of the first embedding groove.

2. The sealing structure of a double-helix rotor pump according to claim 1, characterized in that: A bearing seal cover (13) is fitted on the left side of the surface of the shaft (5). The bearing seal cover (13) is fixedly connected to the left side of the bearing end cover (2) by bolts. A second sealing bearing (14) is fixedly connected inside the bearing seal cover (13). The inner ring of the second sealing bearing (14) is fixedly connected to the surface of the shaft (5). The inside of the bearing seal cover (13) is filled with waterproof grease.

3. The sealing structure of a double-helix rotor pump according to claim 2, characterized in that: The sealing gasket ring (10) has several evenly distributed through holes on its surface, and an expansion column (15) is fixedly connected inside the through holes. An inner retaining ring (16) is fixedly connected to the right side of the expansion column (15). The surface of the inner retaining ring (16) is fixedly connected to the inner wall of the double helical rotor pump housing (1). The right side of the inner retaining ring (16) is provided with an inwardly inclined slope.

4. The sealing structure of a double-helix rotor pump according to claim 3, characterized in that: Damping contraction rods (17) are fixedly connected to the four corners on the right side of the bearing end cover (2). The right end of the damping contraction rod (17) is fixedly connected to the left side of the double helical rotor pump housing (1). A stabilizing spring (18) is sleeved on the surface of the damping contraction rod (17). The left and right ends of the stabilizing spring (18) are respectively attached to the right side of the bearing end cover (2) and the left side of the double helical rotor pump housing (1).

5. The sealing structure of a double-helix rotor pump according to claim 4, characterized in that: The left end of the second sealing cylinder (9) is provided with a concave ring (19), the surface of which is in contact with the inside of the U-shaped sealing ring (8).

6. The sealing structure of a double-helix rotor pump according to claim 5, characterized in that: A stabilizer (20) is fixedly connected to the right side inside the pump casing (1) of the double helical rotor pump. A third sealed bearing (21) is fixedly connected inside the stabilizer (20). The right end of the shaft (5) passes through the third sealed bearing (21) and is fixedly connected to its inner ring.

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