Mechanical seal for axial flow pump

Abstract

The utility model relates to the technical field of assembled mechanical seal, especially relates to a mechanical seal for axial flow pump. The utility model discloses: the inside seal and outside seal of being sleeved on the shaft, the shaft sleeve of inside seal is sleeved on the shaft, pump efficiency ring and bearing are sequentially sleeved on the outside of shaft sleeve one, cavity one is sleeved between pump cover and shaft sleeve one, and is fixed through bolt between cavity one and shaft sleeve one, and the seal core is installed between shaft sleeve one and cavity one, the shaft sleeve of outside seal is sleeved on the shaft, and the end cover and cavity two are sleeved on the outside of shaft sleeve two, and the end cover and cavity two are fixedly connected through bolt, and the end cover and shaft sleeve two are fixedly connected through bolt, and the inside seal core is installed between shaft sleeve two and cavity two, and the outside seal core is installed between shaft sleeve two and end cover. The utility model solves the problem that the service life of the existing mechanical seal for axial flow pump is difficult to reach the expectation under the harsh working condition of axial flow pump, and the frequent replacement of mechanical seal also loses a large amount of fund and time cost.

Description

Technical Field

[0001] This utility model relates to the field of cartridge mechanical seal technology, and in particular to a mechanical seal for axial flow pumps. Background Technology

[0002] Axial flow pumps are mainly used in applications requiring high flow rates and low head, and are widely used in fields such as farmland irrigation, urban drainage, water conservancy pumping, and chemical processes. In farmland and urban drainage scenarios, the medium has a high sand content, which easily wears down the seals; in the chemical industry, the medium is corrosive, flammable, and explosive, requiring extremely high safety and reliability of the seals.

[0003] Early axial flow pumps used packing seals, but these suffered from leakage and wear problems. With increasing automation in industrial production, axial flow pumps require longer periods of stable operation to reduce equipment failures and production interruptions caused by seal failures. Industries such as chemical and power generation have extremely high requirements for the reliability of axial flow pump seals. Compared to packing seals, mechanical seals offer superior sealing performance and service life. However, when facing harsh operating conditions such as those involving solid particles, high corrosion, high temperature, and high pressure, new sealing materials and structures need to be developed. Existing mechanical seals often fail to meet expected lifespans under harsh axial flow pump conditions, and frequent replacements result in significant financial and time costs.

[0004] In view of the problems existing in the prior art, it is necessary to study and design a new type of mechanical seal for axial flow pumps to overcome the problems existing in the prior art. Summary of the Invention

[0005] The existing mechanical seals for axial flow pumps suffer from limitations in lifespan under harsh operating conditions, and frequent replacements result in significant financial and time costs. This invention addresses these technical problems by providing a new type of mechanical seal for axial flow pumps. This new seal employs dual protection with both internal and external seals, enabling stable operation of the axial flow pump under various complex conditions and resolving the issue of mechanical seals' inability to adapt to harsh axial flow pump operating conditions.

[0006] The technical means adopted in this utility model are as follows: A mechanical seal for an axial flow pump includes: an inner seal and an outer seal fitted onto a shaft; Furthermore, the inner seal includes: a shaft sleeve, a pump efficiency ring, a sealing core, and a cavity. Furthermore, a bushing is fitted onto the shaft; a pump efficiency ring and a bearing are fitted onto the outside of the bushing in sequence; a cavity is fitted between the pump cover and the bushing; the cavity and the bushing are fixed together by bolts; and a sealing core is installed between the bushing and the cavity. Furthermore, the outer seal includes: a second bushing, a second cavity, an end cover, an inner sealing core, and an outer sealing core; the second bushing is fitted onto the shaft; the end cover and the second cavity are fitted onto the outside of the second bushing; the end cover and the second cavity are fixedly connected by bolts; the end cover and the second bushing are fixedly connected by bolts; the inner sealing core is installed between the second bushing and the second cavity; and the outer sealing core is installed between the second bushing and the end cover.

[0007] Furthermore, the pump efficiency ring is fixedly fitted to the outside of the bushing one by screws two and three.

[0008] Furthermore, the sealing core includes: three O-rings, one anti-rotation pin, one non-compensation ring, one compensation ring, one retaining ring, four O-rings, one push ring, one spring, one screw, and one compensation ring seat; Furthermore, the non-compensation ring is installed between the cavity and the bushing; the non-compensation ring and the cavity are connected by the O-ring and the anti-rotation pin, and are prevented from rotating by the anti-rotation pin. Furthermore, the compensating ring seat 1, spring 1, push ring 1, compensating ring 1, and retaining ring 1 are sequentially fitted onto the bushing 1. An O-ring 4 is installed between the compensating ring seat 1 and the bushing 1, and they are connected by a screw 1. Furthermore, the uncompensated ring 1 and the compensated ring 1 are fitted together.

[0009] Furthermore, a throttling bushing is also fitted onto the bushing; Furthermore, the throttling bushing is connected and sealed to the cavity by O-ring one and O-ring two.

[0010] Furthermore, the inner sealing core includes: O-ring five, sealing ring one, non-compensating ring two, compensating ring two, screw five, O-ring six, sealing ring two, compensating ring seat two, anti-rotation pin two, spring two, O-ring seven, and support ring; Furthermore, the non-compensating ring two is connected to the bushing two through the transmission sleeve and the retaining ring two, the transmission sleeve is connected to the bushing two through the screw four, and the back of the non-compensating ring two is engaged with the bushing two through the O-ring five and the sealing ring one; Furthermore, the compensation ring 2, screw 5, O-ring 6, sealing ring 2, compensation ring seat 2, anti-rotation pin 2, spring 2, O-ring 7, and support ring are sequentially installed into the cavity 2. The compensation ring 2 is connected to the compensation ring seat 2 by screw 5, and the back of the compensation ring 2 is engaged with the compensation ring seat 2 by O-ring 6 and sealing ring 2. Furthermore, the compensation ring seat 2 is connected to the cavity 2 via the anti-rotation pin 2, and an O-ring 7 and a support ring are installed between the compensation ring seat 2 and the cavity 2; Furthermore, the uncompensated ring two and the compensated ring two are fitted together.

[0011] Furthermore, the outer sealing core includes a compensating ring seat three, a screw six, a spring three, a push ring two, an O-ring eight, a compensating ring three, a retaining ring three, a non-compensating ring three, an anti-rotation pin three, and an O-ring nine; Furthermore, the non-compensation ring three is connected to the end cap through the O-ring nine and the anti-rotation pin three, and is protected against rotation by the anti-rotation pin three; Furthermore, the compensating ring seat three, spring three, push ring two, compensating ring three, and retaining ring three are sequentially fitted onto the bushing two. An O-ring eight is installed between the compensating ring three and the bushing two, and they are connected by screw six. Furthermore, the uncompensated ring three and the compensated ring three are fitted together.

[0012] Furthermore, the non-compensated ring adopts an anti-backpressure structure to prevent excessive pressure impact on the seals due to abnormal backpressure rise during system operation, thereby avoiding damage to the seals and extending their service life.

[0013] Compared with the prior art, the present invention has the following advantages: 1. The mechanical seal for axial flow pumps provided by this utility model provides dual protection through inner and outer sealing, enabling axial flow pumps to operate stably under various complex working conditions and improving work efficiency. 2. The mechanical seal for axial flow pumps provided by this utility model uses bearings for the inner seal, which effectively avoids the impact of vibration and swaying on the seal and improves the service life of the seal. 3. The mechanical seal for axial flow pumps provided by this utility model adopts a pump efficiency ring structure for the inner seal, and the lubricating fluid in the inner seal is delivered to the outer seal to promote the flow of lubricating fluid, thereby improving the sealing performance.

[0014] 4. The mechanical seal for axial flow pumps provided by this utility model adopts an anti-back pressure structure through the inner sealing non-compensation ring, which prevents excessive pressure impact on the seal due to abnormal back pressure rise during system operation, avoids damage to the seal, and thus extends the service life of the seal.

[0015] 5. The mechanical seal for axial flow pumps provided by this utility model effectively prevents impurities in the medium from flowing into the sealing end face by installing a throttling bushing structure in the inner sealing cavity, thus extending the service life of the seal.

[0016] 6. The mechanical seal for axial flow pumps provided by this utility model has the same effective diameter at the auxiliary sealing points of the inner compensating ring and the non-compensating ring in the outer seal, which automatically balances the axial force, and the compensating ring and the non-compensating ring are not easily deformed, thus improving the sealing reliability.

[0017] In summary, the mechanical seal for axial flow pumps with a dual protection structure of internal and external sealing, which utilizes the technical solution of this utility model, has excellent sealing performance and improves the stability of the seal under conditions of solid particles, high corrosion, high temperature and high pressure. It solves the problems of unstable operation and susceptibility to pressure and speed changes in existing mechanical seals for axial flow pumps. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model; In the diagram: 1. Cavity 1; 2. Bushing 1; 3. Throttling Bushing; 4. O-ring 1; 5. O-ring 2; 6. O-ring 3; 7. Anti-rotation Pin 1; 8. Non-compensating Ring 1; 9. Compensating Ring 1; 10. Snap Ring 1; 11. O-ring 4; 12. Push Ring 1; 13. Spring 1; 14. Screw 1; 15. Compensating Ring Seat 1; 16. Bearing; 17. Pump Efficiency Ring; 18. Screw 2; 19. Screw 3; 20. Bushing 2; 21. Transmission Sleeve; 22. Screw 4; 23. Snap Ring 2; 24. O-ring 5; 25. 26. Sealing ring 1, 27. Non-compensating ring 2, 28. Compensating ring 2, 29. Screw 5, 30. Sealing ring 2, 31. O-ring 6, 32. Compensating ring seat 2, 33. Anti-rotation pin 2, 34. Spring 2, 35. O-ring 7, 36. Support ring, 37. Cavity 2, 38. Compensating ring seat 3, 39. Screw 6, 40. Spring 3, 41. Push ring 2, 42. O-ring 8, 43. Compensating ring 3, 44. Snap ring 3, 45. Non-compensating ring 3, 46. Anti-rotation pin 3, 47. O-ring 9, 48. End cap. Detailed Implementation

[0020] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0024] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0025] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0026] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0027] As shown in the figure, this utility model provides a mechanical seal for an axial flow pump, including: an inner seal and an outer seal fitted on the shaft; the inner seal includes: a shaft sleeve 2, a pump efficiency ring 17, a sealing core, and a cavity 1; The first bushing 2 is fitted onto the shaft; the pump efficiency ring 17 and the bearing 16 are sequentially fitted onto the outside of the first bushing 2; the first cavity 1 is fitted between the pump cover and the first bushing 2; the first cavity 1 and the first bushing 2 are fixed together by bolts; the sealing core is installed between the first bushing 2 and the first cavity 1; the outer seal includes: the second bushing 20, the second cavity 36, the end cover 47, the inner sealing core, and the outer sealing core; the second bushing 20 is fitted onto the shaft; the end cover 47 and the second cavity 36 are fitted onto the outside of the second bushing 20; the end cover 47 and the second cavity 36 are fixed together by bolts; the end cover 47 and the second bushing 20 are fixed together by bolts; the inner sealing core is installed between the second bushing 20 and the second cavity 36; the outer sealing core is installed between the second bushing 20 and the end cover 47.

[0028] The pump efficiency ring 17 is fixedly fitted onto the outside of the bushing 2 by screw 2 18 and screw 3 19.

[0029] The sealing core includes: O-ring 36, anti-rotation pin 7, non-compensation ring 8, compensation ring 9, retaining ring 10, O-ring 41, push ring 12, spring 13, screw 14, and compensation ring seat 15; non-compensation ring 8 is installed between cavity 1 and bushing 2; non-compensation ring 8 is connected to cavity 1 by O-ring 36 and anti-rotation pin 7, and is prevented from rotating by anti-rotation pin 7; compensation ring seat 15, spring 13, push ring 12, compensation ring 9, and retaining ring 10 are sequentially fitted onto bushing 2, O-ring 41 is installed between compensation ring seat 15 and bushing 2, and they are connected by screw 14; non-compensation ring 8 and compensation ring 9 are in contact with each other.

[0030] A throttling bushing 3 is also fitted on the bushing 2; the throttling bushing 3 is connected and sealed to the cavity 1 by O-ring 4 and O-ring 5.

[0031] The inner sealing core includes: O-ring 5 24, sealing ring 1 25, non-compensating ring 2 26, compensating ring 2 27, screw 5 28, O-ring 6 30, sealing ring 2 29, compensating ring seat 2 31, anti-rotation pin 2 32, spring 2 33, O-ring 7 34, and support ring 35; the non-compensating ring 2 26 is connected to the bushing 2 20 through the transmission sleeve 21 and the retaining ring 2 23, the transmission sleeve 21 is connected to the bushing 2 20 through screw 4 22, and the back of the non-compensating ring 2 26 mates with the bushing 2 20 through O-ring 5 24 and sealing ring 1 25; compensating ring 2 27, screw 5 28, O-ring 6 30, sealing ring 2 29, compensating ring seat 2 31, anti-rotation pin 2 32, spring 2 33, O-ring 7 34, and support ring 35; O-ring 6 30, sealing ring 29, compensating ring seat 2 31, anti-rotation pin 2 32, spring 2 33, O-ring 7 34, and support ring 35 are sequentially installed inside cavity 2 36. Compensating ring 2 27 is connected to compensating ring seat 2 31 by screw 5 28, and the back of compensating ring 2 27 is engaged with compensating ring seat 2 31 by O-ring 6 30 and sealing ring 2 29. Compensating ring seat 2 31 is connected to cavity 2 36 by anti-rotation pin 2 32, and O-ring 7 34 and support ring 35 are installed between compensating ring seat 2 31 and cavity 2 36. Non-compensating ring 2 26 and compensating ring 2 27 are in contact with each other.

[0032] The outer sealing core includes a compensating ring seat 37, a screw 38, a spring 39, a push ring 2 40, an O-ring 8 41, a compensating ring 3 42, a retaining ring 3 43, a non-compensating ring 3 44, an anti-rotation pin 3 45, and an O-ring 9 46. The non-compensating ring 3 44 is connected to the end cover 47 through the O-ring 9 46 and the anti-rotation pin 3 45, and is prevented from rotating by the anti-rotation pin 3 45. The compensating ring seat 37, spring 39, push ring 2 40, compensating ring 3 42, and retaining ring 3 43 are sequentially fitted onto the bushing 2 20. An O-ring 8 41 is installed between the compensating ring 3 42 and the bushing 2 20, and they are connected by a screw 6 38. The non-compensating ring 3 44 and the compensating ring 3 42 are in contact with each other.

[0033] The non-compensated ring 18 adopts an anti-back pressure structure to prevent excessive pressure impact on the seals caused by abnormal back pressure rise during system operation, thereby avoiding damage to the seals and extending their service life.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A mechanical seal for an axial flow pump, characterized in that: The mechanical seal for the axial flow pump includes: an inner seal and an outer seal fitted onto the shaft; The inner seal includes: a bushing (2), a pump efficiency ring (17), a sealing core, and a cavity (1). The first bushing (2) is fitted onto the shaft; the pump efficiency ring (17) and the bearing (16) are fitted onto the outside of the first bushing (2) in sequence; the first cavity (1) is fitted between the pump cover and the first bushing (2); the first cavity (1) and the first bushing (2) are fixed together by bolts; the sealing core is installed between the first bushing (2) and the first cavity (1); The outer seal includes: a second bushing (20), a second cavity (36), an end cap (47), an inner sealing core, and an outer sealing core; the second bushing (20) is fitted onto the shaft; the end cap (47) and the second cavity (36) are fitted onto the outside of the second bushing (20); the end cap (47) and the second cavity (36) are fixedly connected by bolts; the end cap (47) and the second bushing (20) are fixedly connected by bolts; the inner sealing core is installed between the second bushing (20) and the second cavity (36); the outer sealing core is installed between the second bushing (20) and the end cap (47).

2. The mechanical seal for an axial flow pump according to claim 1, characterized in that: The pump efficiency ring (17) is fixedly fitted onto the outside of the bushing (2) by screw two (18) and screw three (19).

3. The mechanical seal for an axial flow pump according to claim 1, characterized in that: The sealing core includes: O-ring three (6), anti-rotation pin one (7), non-compensation ring one (8), compensation ring one (9), retaining ring one (10), O-ring four (11), push ring one (12), spring one (13), screw one (14) and compensation ring seat one (15). The non-compensation ring 1 (8) is installed between cavity 1 (1) and bushing 1 (2); the non-compensation ring 1 (8) and cavity 1 (1) are connected by O-ring 3 (6) and anti-rotation pin 1 (7), and anti-rotation is prevented by anti-rotation pin 1 (7); The compensation ring seat 1 (15), spring 1 (13), push ring 1 (12), compensation ring 1 (9), and retaining ring 1 (10) are sequentially fitted onto bushing 1 (2). O-ring 4 (11) is installed between compensation ring seat 1 (15) and bushing 1 (2), and they are connected by screw 1 (14). The non-compensation ring 1 (8) and the compensation ring 1 (9) are fitted together.

4. The mechanical seal for an axial flow pump according to claim 3, characterized in that: A throttling bushing (3) is also fitted on the bushing (2); The throttling bushing (3) is connected and sealed to the cavity (1) by O-ring (4) and O-ring (5).

5. The mechanical seal for an axial flow pump according to claim 1, characterized in that: The inner sealing core includes: O-ring five (24), sealing ring one (25), non-compensation ring two (26), compensation ring two (27), screw five (28), O-ring six (30), sealing ring two (29), compensation ring seat two (31), anti-rotation pin two (32), spring two (33), O-ring seven (34), and support ring (35); The non-compensation ring two (26) is connected to the bushing two (20) through the transmission sleeve (21) and the retaining ring two (23). The transmission sleeve (21) is connected to the bushing two (20) through the screw four (22). The back of the non-compensation ring two (26) is engaged with the bushing two (20) through the O-ring five (24) and the sealing ring one (25). The compensation ring 2 (27), screw 5 (28), O-ring 6 (30), sealing ring 2 (29), compensation ring seat 2 (31), anti-rotation pin 2 (32), spring 2 (33), O-ring 7 (34), and support ring (35) are sequentially installed into cavity 2 (36). The compensation ring 2 (27) is connected to the compensation ring seat 2 (31) by screw 5 (28), and the back of the compensation ring 2 (27) is engaged with the compensation ring seat 2 (31) by O-ring 6 (30) and sealing ring 2 (29). The compensation ring seat 2 (31) is connected to the cavity 2 (36) through the anti-rotation pin 2 (32), and an O-ring 7 (34) and a support ring (35) are installed between the compensation ring seat 2 (31) and the cavity 2 (36). The uncompensated ring 2 (26) and the compensated ring 2 (27) are fitted together.

6. The mechanical seal for an axial flow pump according to claim 1, characterized in that: The outer sealing core includes a compensation ring seat three (37), a screw six (38), a spring three (39), a push ring two (40), an O-ring eight (41), a compensation ring three (42), a retaining ring three (43), a non-compensation ring three (44), an anti-rotation pin three (45), and an O-ring nine (46). The non-compensation ring three (44) is connected to the end cap (47) through O-ring nine (46) and anti-rotation pin three (45), and anti-rotation is prevented by anti-rotation pin three (45); The compensation ring seat three (37), spring three (39), push ring two (40), compensation ring three (42), and retaining ring three (43) are sequentially fitted onto bushing two (20). An O-ring eight (41) is installed between compensation ring three (42) and bushing two (20), and they are connected by screw six (38). The uncompensated ring three (44) and the compensated ring three (42) are fitted together.

7. The mechanical seal for an axial flow pump according to claim 3, characterized in that: The non-compensated ring (8) adopts an anti-back pressure structure to prevent the system from experiencing abnormal back pressure rise during operation, which could cause excessive pressure impact on the seals, thus avoiding damage to the seals and extending their service life.

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