Screw pump with adjustable shaft seal position structure

Abstract

The utility model discloses a screw pump with an adjustable shaft seal position structure, which relates to the technical field of screw pumps and comprises a driving screw, a shaft elastic retainer ring is arranged on the outer side of the top of the driving screw and clings to the end of an adjusting shaft sleeve, a sealing gland is fixedly connected to the outer side of the driving screw, and the sealing gland is fixedly connected to the outer side of the driving screw. A bearing seat is arranged at the end, close to the front end cover, of the sealing gland, a screw is in threaded connection with the end, away from the front end cover, of the sealing gland, the bearing seat is in threaded connection with the sealing gland through the screw, and a bearing is arranged at the bottom of the end, close to the front end cover, of the driving screw. Wherein an O-shaped sealing ring groove is formed in the outer surface of the bottom of the driving screw rod, an elastic check ring groove for a hole is formed in the outer surface of the top of the driving screw rod, an adjusting shaft sleeve is arranged on the outer side of the driving screw rod, and the technical problems that the sealing replacement process is tedious, only one sealing material can be selected, and many limitations exist are solved.

Description

Technical Field

[0001] This utility model relates to the field of screw pump technology, specifically a screw pump with an adjustable shaft seal structure. Background Technology

[0002] In general conveying machinery, mechanical seals or shaft seals are typically used to seal the medium. In conventional screw pump sealing designs, a mechanical seal or a shaft seal is usually used to seal the conveyed medium. In this conventional sealing design, the stationary ring of the mechanical seal or the shaft seal is installed in the sealing gland, and then the sealing gland is fixed to the bearing housing with fasteners. In this way, when the medium conveyed from inside the screw pump enters the sealing cavity, it will be sealed by the mechanical seal or shaft seal and will not leak into the external environment. However, since the seal is a consumable part, it will inevitably wear down after a period of operation, which will lead to a decrease in the sealing effect and even leakage, causing problems for the normal use of the screw pump.

[0003] However, the above-mentioned utility model still has shortcomings:

[0004] 1. During the seal replacement process, the seal gland needs to be removed from the shaft head before the seal can be replaced. However, on the screw pump unit, the screw pump shaft head is equipped with a coupling, which is connected to the prime mover. Therefore, when replacing the seal, the prime mover needs to be removed from the unit, and the coupling also needs to be removed from the shaft head to complete the seal replacement. This is time-consuming and labor-intensive, and it is not conducive to rapid response in the field.

[0005] 2. At the same time, in the selection of sealing materials, for some more complex working conditions, since the properties of the conveyed medium cannot be fully and accurately understood, under the existing single-seal structure, only one sealing material can be selected, which is very restrictive. Moreover, the selected sealing material may not be suitable for the characteristics of the medium, which will also lead to a decrease in sealing capacity and failure to meet the sealing requirements of the working conditions. Utility Model Content

[0006] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a screw pump with an adjustable shaft seal structure, which solves the problems of cumbersome seal replacement process and the limitation of only being able to select one type of sealing material.

[0007] To achieve the above objectives, this utility model proposes a screw pump with an adjustable shaft seal structure, comprising: a drive screw, a shaft elastic retaining ring disposed on the outer side of the top of the drive screw, the shaft elastic retaining ring being tightly fitted to the end of an adjusting bushing, a sealing cover fixedly connected to the outer side of the drive screw, a bearing seat disposed at the end of the sealing cover near the front cover, a screw threadedly connected to the end of the sealing cover away from the front cover, the bearing seat and the sealing cover being threadedly connected by the screw, and a bearing disposed at the bottom of the drive screw near the front cover, wherein:

[0008] The bottom outer surface of the active screw has an O-ring groove, and the top outer surface of the active screw has a groove for a retaining ring. An adjusting sleeve is provided on the outside of the active screw. A set screw is threaded to the end of the adjusting sleeve away from the front end cover. The surface of the adjusting sleeve is engraved with a large step outer circle, a medium step outer circle, and a small step outer circle. A large shaft seal is slidably connected to the surface of the large step outer circle, a medium shaft seal is slidably connected to the surface of the medium step outer circle, and a small shaft seal is slidably connected to the surface of the small step outer circle. A large hole retaining ring is provided on the side of the large shaft seal near the front end cover, a medium hole retaining ring is provided on the side of the medium shaft seal near the front end cover, and a small hole retaining ring is provided on the side of the small shaft seal near the front end cover. The large shaft seal, medium shaft seal, and small shaft seal are all fixedly connected to the sealing cover on the side near the active screw.

[0009] Preferably, the surface of the adjusting bushing is engraved with a large step outer circle and a medium step outer circle. A large shaft seal is slidably connected to the surface of the large step outer circle, and a medium shaft seal is slidably connected to the surface of the medium step outer circle. Both the large and medium shaft seals are fixedly connected to the side of the sealing cover near the driving screw. A large-hole elastic retaining ring is provided on the side of the large shaft seal near the front cover, and a medium-hole elastic retaining ring is provided on the side of the medium shaft seal near the front cover. A small shaft seal is fixedly connected to the side of the sealing cover near the driving screw, and a small-hole elastic retaining ring is provided on the side of the small shaft seal near the front cover.

[0010] Preferably, the inner wall of the adjusting bushing is provided with a second thread, and the outer side of the driving screw is provided with a first thread, and the first thread and the second thread mesh with each other.

[0011] Preferably, the top of the sealing gland is provided with an O-ring groove, and a large O-ring is provided inside the O-ring groove. The inside of the sealing gland is provided with a hole elastic retaining ring groove, and a large hole elastic retaining ring, a medium hole elastic retaining ring, and a small hole elastic retaining ring are respectively provided inside the hole elastic retaining ring groove.

[0012] Preferably, a small O-ring is provided at the end of the active screw near the front end cover.

[0013] Preferably, one end of the driving screw is fixedly connected to a front end cover, one end of the front end cover is fixedly connected to a pump body, a safety valve is provided on the top of the pump body, a driven screw is inserted into the end of the pump body away from the front end cover, a rear end cover is fixedly connected to the end of the pump body away from the front end cover, and a bushing is fixedly connected inside the pump body.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. Several different inner holes are provided on the sealing gland to install shaft seals of different specifications (materials). Several different stepped outer circles are designed on the adjusting bushing to cooperate with the shaft seals for sealing the conveyed medium. At the same time, the inner hole of the adjusting bushing is provided with threads to cooperate with the threads on the outer circle of the drive screw. When the screw pump starts working, the smallest specification shaft seal is used to seal the medium. When the smallest specification shaft seal fails, the position of the adjusting bushing is moved through the thread drive to use a medium specification shaft seal to seal the medium. Similarly, when the medium specification shaft seal fails, the largest specification shaft seal is used to seal the medium. In this way, the sealing time of the medium can be extended several times to meet user requirements. Moreover, all operations can be completed without disassembling the motor and coupling, simplifying operation and maintenance and saving costs for users and manufacturers.

[0016] 2. Multiple shaft seals were used in alternation and rotation, which increased the overall effective sealing time by several times.

[0017] 3. The simultaneous installation of multiple shaft seals allows for the selection of shaft seal materials, meaning that shaft seals of different materials can be installed at once. In some complex working conditions, the adaptability to the medium and the sealing effect of shaft seals made of different materials will be more advantageous and obvious.

[0018] 4. Because there is a threaded fit between the adjusting bushing and the drive screw, the position adjustment of the adjusting bushing can be carried out without disassembling the motor, coupling and other assembly components, which simplifies maintenance operations and saves maintenance costs. Attached Figure Description

[0019] Figure 1 This is a front view diagram of the existing structure;

[0020] Figure 2 This is a schematic diagram of the internal structure of the existing structure;

[0021] Figure 3 This is a schematic diagram of the internal structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the adjusting bushing structure of this utility model;

[0023] Figure 5This is a schematic diagram of the sealing gland part of this utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the second embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the third embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the fourth embodiment of the present invention;

[0027] Figure 9 This is a schematic diagram of the first thread structure of this utility model;

[0028] Figure 10 This is a schematic diagram of the frontal anatomical structure of the present invention.

[0029] In the diagram: 1. Driving screw; 2. Bearing housing; 3. Screw; 4. Sealing gland; 5. Large shaft seal; 51. Elastic retaining ring for large bore; 6. Middle shaft seal; 61. Elastic retaining ring for middle bore; 7. Small shaft seal; 71. Elastic retaining ring for small bore; 81. Large O-ring seal; 82. Small O-ring seal; 83. O-ring groove; 84. Elastic retaining ring groove for bore; 85. First thread; 9. Adjusting bushing; 10. Set screw; 11. Elastic retaining ring for shaft; 111. Outer diameter of large step; 112. Outer diameter of middle step; 113. Outer diameter of small step; 114. Second thread; 12. Bearing; 13. Front end cover; 14. Pump body; 15. Bushing; 16. Driven screw; 17. Rear end cover; 18. Safety valve. Detailed Implementation

[0030] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. 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 skilled in the art without creative effort are within the protection scope of this utility model.

[0031] like Figure 1-10As shown, a screw pump with an adjustable shaft seal structure includes: a drive screw 1, a shaft elastic retaining ring 11 is provided on the outer side of the top of the drive screw 1, the shaft elastic retaining ring 11 can play a limiting role, the shaft elastic retaining ring 11 is tightly attached to the end of the adjusting bushing 9, a sealing cover 4 is fixedly connected to the outer side of the drive screw 1, a bearing seat 2 is provided at the end of the sealing cover 4 near the front cover 13, and a screw 3 is threadedly connected at the end of the sealing cover 4 away from the front cover 13. The screw 3 can make the entire machine structure easier to disassemble, simplify maintenance operations, and save maintenance costs. The bearing seat 2 and the sealing cover 4 are threadedly connected by the screw 3. A bearing 12 is provided at the bottom of the drive screw 1 near the front cover 13.

[0032] In the first specific embodiment: an O-ring groove 83 is formed on the bottom outer surface of the active screw 1, and an elastic retaining ring groove 84 is formed on the top outer surface of the active screw 1. An adjusting sleeve 9 is provided on the outer side of the active screw 1. A second thread 114 is engraved on the inner wall of the adjusting sleeve 9, and a first thread 85 is engraved on the outer side of the active screw 1. The first thread 85 and the second thread 114 mesh with each other. The position of the adjusting sleeve 9 is adjusted by the limiting of the elastic retaining ring 11. A set screw 10 is threaded to the end of the adjusting sleeve 9 away from the front end cover 13. The surface of the adjusting sleeve 9 is engraved with a large step outer circle 111 and a middle step outer circle 111. A large shaft seal 5 is slidably connected to the surface of the outer circle 112, the outer circle 113 of the small step, and the outer circle 111 of the large step. A middle shaft seal 6 is slidably connected to the surface of the outer circle 112 of the middle step. A small shaft seal 7 is slidably connected to the surface of the outer circle 113 of the small step. A large hole elastic retaining ring 51 is provided on the side of the large shaft seal 5 near the front cover 13. A middle hole elastic retaining ring 61 is provided on the side of the middle shaft seal 6 near the front cover 13. A small hole elastic retaining ring 71 is provided on the side of the small shaft seal 7 near the front cover 13. The elastic retaining rings can effectively limit the movement and buffer and dampen the shock. The large shaft seal 5, the middle shaft seal 6, and the small shaft seal 7 are all fixedly connected to the side of the sealing cover 4 near the active screw 1.

[0033] In the second specific embodiment: the surface of the adjusting bushing 9 is engraved with a large step outer circle 111 and a medium step outer circle 112. A large shaft seal 5 is slidably connected to the surface of the large step outer circle 111, and a medium shaft seal 6 is slidably connected to the surface of the medium step outer circle 112. Both the large shaft seal 5 and the medium shaft seal 6 are fixedly connected to the side of the sealing cover 4 near the active screw 1. A large hole elastic retaining ring 51 is provided on the side of the large shaft seal 5 near the front end cover 13, and a medium hole elastic retaining ring 61 is provided on the side of the medium shaft seal 6 near the front end cover 13. A small shaft seal 7 is fixedly connected to the side of the sealing cover 4 near the active screw 1, and a small hole elastic retaining ring 71 is provided on the side of the small shaft seal 7 away from the front end cover 13.

[0034] In the third specific embodiment: the surface of the adjusting bushing 9 is engraved with a large step outer circle 111, the surface of the large step outer circle 111 is slidably connected to a large shaft seal 5, the large shaft seal 5 is fixedly connected to the side of the sealing cover 4 near the active screw 1, the side of the large shaft seal 5 near the front cover 13 is provided with an elastic retaining ring 51 for a large hole, the side of the sealing cover 4 near the active screw 1 is fixedly connected to a middle shaft seal 6, the side of the middle shaft seal 6 near the front cover 13 is provided with an elastic retaining ring 61 for a middle hole.

[0035] In the fourth specific embodiment: the surface of the adjusting bushing 9 is engraved with a large step outer circle 111, the surface of the large step outer circle 111 is slidably connected to a large shaft seal 5, the large shaft seal 5 is fixedly connected to the side of the sealing cover 4 near the active screw 1, the side of the large shaft seal 5 near the front end cover 13 is provided with a large hole elastic retaining ring 51, and the side of the middle shaft seal 6 away from the front end cover 13 is provided with a middle hole elastic retaining ring 61.

[0036] The top of the sealing gland 4 is provided with an O-ring groove 83, and a large O-ring 81 is provided inside the O-ring groove 83. The sealing gland 4 is provided with a hole elastic retaining ring groove 84, and a large hole elastic retaining ring 51, a medium hole elastic retaining ring 61, and a small hole elastic retaining ring 71 are respectively provided inside the hole elastic retaining ring groove 84.

[0037] The active screw 1 has a hole elastic retaining ring groove 84 at one end near the front end cover 13. A small O-ring seal 82 is provided inside the hole elastic retaining ring groove 84. The active screw 1 has a small O-ring seal 82 at one end near the front end cover 13.

[0038] One end of the active screw 1 is fixedly connected to a front end cover 13, and one end of the front end cover 13 is fixedly connected to a pump body 14. A safety valve 18 is provided on the top of the pump body 14. A driven screw 16 is inserted into the end of the pump body 14 away from the front end cover 13. A rear end cover 17 is fixedly connected to the end of the pump body 14 away from the front end cover 13. A bushing 15 is fixedly connected inside the pump body 14.

[0039] Working principle: During operation, the bushing 9 is first adjusted to be installed on the right side of the elastic retaining ring 11 and fastened to the drive screw 1 by the set screw 10 on the outer circle. At this time, the small shaft seal 7 is installed on the small step outer circle 113 of the adjusting bushing 9 that it mates with. The sealing fit formed by the two can seal the conveyed medium. The large shaft seal 5 and the middle shaft seal 6 are respectively distributed on the empty outer circle of the adjusting bushing 9. The inner diameter of the large shaft seal 5 and the middle shaft seal 6 is larger than the outer circle diameter that they mate with. The large shaft seal 5 and the middle shaft seal 6 do not play a sealing role. Only the small shaft seal 7 plays a sealing role.

[0040] After a certain period of operation, the inner hole of the small shaft seal 7 becomes worn and fails, and can no longer perform its sealing function. At this time, the set screw 10 can be loosened, and the adjusting sleeve 9 can be rotated to adjust the adjusting sleeve 9 to the appropriate position through the thread. Then, the set screw 10 is tightened to secure the adjusting sleeve 9 to the drive screw 1. At this time, the middle shaft seal 6 is installed on the outer circle 112 of the middle step of the adjusting sleeve 9 that it mates with. The sealing fit formed by the two can seal the conveyed medium. The large shaft seal 5 and the small shaft seal 7 are distributed on the outer circle of the gap of the adjusting sleeve 9. The inner diameter of the large shaft seal 5 and the small shaft seal 7 is larger than the outer diameter of the circle that it mates with. The large shaft seal 5 and the small shaft seal 7 do not perform the sealing function. Only the middle shaft seal 6 performs the sealing function. Moreover, during the operation, the adjustment can be completed without disassembling the motor, coupling and other assembly parts, which saves time and effort.

[0041] After a certain period of operation, the inner hole of the central shaft seal 6 becomes worn and fails, and can no longer perform its sealing function. At this time, the set screw 10 can be loosened, and the adjusting sleeve 9 can be rotated to adjust the adjusting sleeve 9 to the appropriate position through the thread. Then, the set screw 10 is tightened to secure the adjusting sleeve 9 to the drive screw 1. At this time, the large shaft seal 5 is installed on the outer circle 111 of the large step of the adjusting sleeve 9 that it mates with. The sealing fit formed by the two can seal the conveyed medium. At this time, the central shaft seal 6 and the small shaft seal 7 are distributed on the outer circle of the gap of the adjusting sleeve 9. The inner diameter of the central shaft seal 6 and the small shaft seal 7 is larger than the outer diameter of the circle that mates with them. The central shaft seal 6 and the small shaft seal 7 do not perform the sealing function. Only the large shaft seal 5 performs the sealing function. Moreover, during the operation, the adjustment can be completed without disassembling the motor, coupling and other assembly parts, which saves time and effort.

[0042] The above embodiments are only used to illustrate the technical methods of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of this utility model without departing from the spirit and scope of the technical methods of this utility model.

Claims

1. A screw pump having an adjustable seal land structure, characterized by, include: An active screw (1) is provided with a shaft elastic retaining ring (11) on the outer side of its top. The shaft elastic retaining ring (11) is tightly attached to the end of the adjusting bushing (9). A sealing cover (4) is fixedly connected to the outer side of the active screw (1). A bearing seat (2) is provided at the end of the sealing cover (4) near the front cover (13). A screw (3) is threadedly connected to the end of the sealing cover (4) away from the front cover (13). The bearing seat (2) and the sealing cover (4) are threadedly connected by the screw (3). A bearing (12) is provided at the bottom of the active screw (1) near the front cover (13). Wherein: The bottom outer surface of the active screw (1) is provided with an O-ring groove (83), and the top outer surface of the active screw (1) is provided with a retaining ring groove (84). An adjusting bushing (9) is provided on the outside of the active screw (1). A set screw (10) is threadedly connected to the end of the adjusting bushing (9) away from the front end cover (13). The surface of the adjusting bushing (9) is engraved with a large step outer circle (111), a medium step outer circle (112), and a small step outer circle (113). A large shaft seal (5) is slidably connected to the surface of the large step outer circle (111). (112) has a central shaft seal (6) slidably connected to its surface, and a small shaft seal (7) slidably connected to the surface of the outer circle of the small step (113). The large shaft seal (5) has a large hole elastic retaining ring (51) on the side near the front end cover (13). The central shaft seal (6) has a central hole elastic retaining ring (61) on the side near the front end cover (13). The small shaft seal (7) has a small hole elastic retaining ring (71) on the side near the front end cover (13). The large shaft seal (5), the central shaft seal (6), and the small shaft seal (7) are all fixedly connected to the sealing cover (4) on the side near the active screw (1).

2. A screw pump with an adjustable seal location structure according to claim 1, characterized in that, The surface of the adjusting bushing (9) is engraved with a large step outer circle (111) and a medium step outer circle (112). A large shaft seal (5) is slidably connected to the surface of the large step outer circle (111), and a medium shaft seal (6) is slidably connected to the surface of the medium step outer circle (112). The large shaft seal (5) and the medium shaft seal (6) are both fixedly connected to the sealing cover (4) on the side near the driving screw (1). A large hole elastic retaining ring (51) is provided on the side of the large shaft seal (5) near the front end cover (13). A medium hole elastic retaining ring (61) is provided on the side of the medium shaft seal (6) near the front end cover (13). A small shaft seal (7) is fixedly connected to the side of the sealing cover (4) near the driving screw (1). A small hole elastic retaining ring (71) is provided on the side of the small shaft seal (7) near the front end cover (13).

3. A screw pump with an adjustable seal location according to claim 1, wherein, The inner wall of the adjusting bushing (9) is engraved with a second thread (114), and the outer side of the driving screw (1) is engraved with a first thread (85). The first thread (85) and the second thread (114) mesh with each other.

4. The screw pump with adjustable seal land structure of claim 1, wherein, The top of the sealing cap (4) is provided with an O-ring groove (83), and a large O-ring (81) is provided inside the O-ring groove (83). The inside of the sealing cap (4) is provided with a hole elastic retaining ring groove (84), and a large hole elastic retaining ring (51), a medium hole elastic retaining ring (61), and a small hole elastic retaining ring (71) are respectively provided inside the hole elastic retaining ring groove (84).

5. The screw pump with adjustable seal land structure of claim 1 wherein, The active screw (1) is provided with a small O-ring (82) at one end near the front end cover (13).

6. A screw pump having an adjustable seal land structure according to claim 1, wherein One end of the active screw (1) is fixedly connected to a front end cover (13), one end of the front end cover (13) is fixedly connected to a pump body (14), a safety valve (18) is provided on the top of the pump body (14), a driven screw (16) is inserted into the pump body (14) away from the front end cover (13), a rear end cover (17) is fixedly connected to the pump body (14) away from the front end cover (13), and a bushing (15) is fixedly connected inside the pump body (14).

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