Built-in mechanical sealing device with deviation rectifying function and slurry circulating pump of built-in mechanical sealing device

Abstract

The utility model discloses a built-in mechanical sealing device with a deviation rectifying function and a slurry circulating pump of the built-in mechanical sealing device with the deviation rectifying function, and the built-in mechanical sealing device is characterized in that an O-shaped ring is arranged between a sealing gland and a lining plate to well seal the sealing gland and the lining plate; and a protective backing ring made of a flexible material is arranged in the annular groove. In addition, an inclined groove is formed in the protective backing ring, and the placed O-shaped ring can be prevented from falling off in the mechanical seal carrying and overturning process. And the O-shaped ring is prevented from being accidentally damaged due to dislocation installation. The overall service life of the mechanical seal is prolonged, and the mechanical seal can stably work under the optimal installation precision and the optimal operation precision. And the optimal performance of the mechanical seal is exerted. And leakage and leakage in the service life are prevented. And the maximum efficiency of the desulfurization slurry circulating pump is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical equipment, and in particular relates to a built-in mechanical sealing device with a deviation correction function and a slurry circulation pump thereof. Background Art

[0002] The slurry is transported by a slurry pump, and the slurry pump comprises a pump shaft and a shaft sleeve coaxially sleeved outside the pump shaft, and a mechanical sealing device is used to seal between the pump shaft and the shaft sleeve.

[0003] However, during the long-term use of the slurry pump, the liner of the slurry circulation pump is difficult to maintain the accuracy at the time of leaving the factory due to the limited maintenance conditions. The vertical deviation between the positioning section of the mechanical seal and the pump shaft is very large, up to 0.8mm. The maximum concentricity deviation between the positioning stop and the pump shaft is 1mm, which seriously affects the normal use of the mechanical seal. Conventional mechanical sealing devices cannot compensate for it, and the friction end faces of the dynamic and static rings of the mechanical seal cannot be stably fitted, which makes it easy for the sealing end face to open, causing foreign matter to enter and cause slurry leakage; it is also impossible to ensure the stable operation of the slurry circulation pump, affecting the effect of flue gas desulfurization, and in serious cases, the unit load must be reduced. Summary of the invention

[0004] Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an internal mechanical sealing device with a correction function and a slurry circulation pump thereof, which solves the problem of slurry leakage caused by the prior art; the stable operation of the slurry circulation pump cannot be guaranteed, which affects the effect of flue gas desulfurization and requires the unit load to be reduced in serious cases.

[0006] Technical Solution

[0007] In order to solve the above technical problems, on the one hand, the utility model provides such an internal mechanical seal device with a deviation correction function and a slurry circulation pump thereof, comprising a static seal assembly sleeved on a pump shaft and rotating together with the pump shaft, and a floating ring arranged on one side of the static seal assembly, the static seal assembly rotates relative to the floating ring, the floating ring abuts against one end face of the static seal assembly through a sealing gland, and the end face adjacent to the static seal assembly and the floating ring is a mechanical seal compensation end face, and the sealing gland is fixedly mounted on a liner of a pump housing;

[0008] An annular step is provided at one end of the sealing gland close to the liner, an annular groove is provided on the axial side wall of the annular step inwardly along the radial direction of the sealing gland, a circle of protective gasket is arranged in the annular groove, an inclined groove is provided inwardly along the side close to the sealing gland on the outer side of the protective gasket, and the protective gasket is made of flexible material;

[0009] An O-ring for sealing the liner plate and the sealing gland is arranged in the inclined groove.

[0010] Preferably, the inclined groove comprises a first groove body parallel to the axis where the pump shaft is located and a second groove body inclined at an angle relative to the first groove body.

[0011] Preferably, the angle between the first slot body and the second slot body is 120°-135°.

[0012] Preferably, the static sealing assembly comprises a shaft sleeve and a rotating ring, wherein the shaft sleeve is sleeved on the pump shaft and rotates together with the pump shaft, and the rotating ring is coaxially arranged with the shaft sleeve and connected via a transmission pin.

[0013] Preferably, it also includes a rear pressure cover, which is arranged on a side of the sealing pressure cover and the floating ring away from the mechanical seal compensation end face, and the rear pressure cover is used to limit the axial position of the sealing pressure cover and the floating ring to prevent the sealing pressure cover and the floating ring from deviating from the static seal assembly.

[0014] Preferably, the floating ring includes a spring that abuts against the rotating ring, and the sealing cover presses the floating ring onto the rotating ring through a spring, and one end of the spring is arranged on the rear cover, and the other end abuts against the sealing cover.

[0015] Preferably, a sealing ring is provided between the outer side wall of the floating ring and the sealing gland.

[0016] Preferably, it also includes an axial positioning block;

[0017] The axial positioning block is arranged on one end surface of the rear gland, and the axial positioning block can fix the static seal assembly and the floating ring in the axial and radial directions through bolts to form a rigid whole.

[0018] Preferably, it also includes a first fixing bolt, which is used to fix the sealing cover on the liner of the pump housing.

[0019] On the other hand, a slurry circulation pump includes an internal mechanical seal device with a deviation correction function, a pump housing and a pump shaft. Beneficial Effects

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] The utility model discloses an internal mechanical seal device with a deviation correction function and a slurry circulation pump thereof. An "O" ring is arranged between the sealing gland and the liner to achieve good sealing between the sealing gland and the liner, and an annular groove is arranged on the sealing gland, and a protective gasket ring made of a flexible material is arranged in the annular groove. In addition, an inclined groove is provided on the protective gasket ring, which can prevent the placed "O" ring from falling off during the transportation and flipping of the mechanical seal. The protective "O" ring is accidentally damaged due to dislocation installation. The service life of the mechanical seal as a whole is improved. At the same time, because the protective gasket ring is made of a flexible material, when the sealing gland is corrected and installed: when encountering a large gap, the "O" ring can release pressure to expand and fill the gap to eliminate it. When encountering an excess part of the "O" ring, the "O" ring can be cut off or compressed without generating rigid resistance. Therefore, the connection between the sealing gland and the floating ring can be better ensured, and the sealing between the dynamic and static friction sealing end faces between the floating ring and the static sealing component can be ensured. Ensure that the end faces of the dynamic and static seal components of the mechanical seal always maintain good fit, avoid the impact of the mechanical seal compensation end face deflection on the stable running-in of the end faces of the floating ring and the rotating ring, ensure the stable operation of the seal friction end face and reliable mechanical seal performance; thereby ensuring the safe operation of the slurry circulation pump. Solve the problem of slurry leakage in the prior art; it is also impossible to ensure the stable operation of the slurry circulation pump, affecting the effect of flue gas desulfurization, and in serious cases, the unit load must be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a partial cross-sectional structural schematic diagram of an internal mechanical sealing device with a deviation correction function and a slurry circulation pump thereof according to the utility model;

[0023] Figure 2 for Figure 1 The upper part is a detailed enlarged structural diagram;

[0024] Figure 3 for Figure 2 A detailed enlarged structural diagram of the connection between the sealing gland and the liner;

[0025] Figure 4 for Figure 1 The lower part is a detailed enlarged structural diagram.

[0026] [Description of Reference Numerals]

[0027] 1. Pump shaft; 2. Static seal assembly; 21. Bushing; 22: Rotating ring; 23. First O-type static seal ring; 24. Second O-type static seal ring; 3. Floating ring; 4. Sealing cover; 41. Annular groove; 42. Protective gasket; 421. Inclined groove; 43. Push ring; 5. Lining plate; 6. "O" ring; 7. Drive pin; 8. Rear cover; 9. Spring; 10. Sealing ring; 11. Axial positioning block; 111. First axial fixing bolt; 112. First radial fixing bolt; 12. First fixing bolt; 13. Fixing nut; 14. Second fixing bolt. DETAILED DESCRIPTION

[0028] In order to better explain the utility model and facilitate understanding, the utility model is described in detail below with reference to the accompanying drawings through specific implementation methods. Figure 1 The orientation of is used as a reference. The side close to the pump shaft 1 is defined as "inner".

[0029] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0030] See also Figure 1-Figure 4 The specific embodiment is a slurry circulation pump, including an internal mechanical seal device with a deviation correction function, a pump housing and a pump shaft 1. Among them, an internal mechanical seal device with a deviation correction function and a slurry circulation pump thereof include a static seal assembly 2 that is sleeved on the pump shaft 1 and rotates with the pump shaft 1, and a floating ring 3 arranged on one side of the static seal assembly 2. The static seal assembly 2 rotates relative to the floating ring 3. The floating ring 3 abuts against one end face of the static seal assembly 2 through a sealing gland 4, and the adjacent end faces of the static seal assembly 2 and the floating ring 3 are mechanical seal compensation end faces. The sealing gland 4 is fixedly mounted on the liner 5 of the pump housing. Moreover, an annular step is provided at one end of the sealing gland 4 close to the liner 5, and an annular groove 41 is provided on the axial side wall of the annular step inwardly along the radial direction of the sealing gland 4, and a circle of protective gasket ring 42 is arranged in the annular groove 41, and an inclined groove 421 is provided inwardly along the side close to the sealing gland 4 on the outer side of the protective gasket ring 42, and the protective gasket ring 42 is made of flexible material. An O-ring 6 for sealing the liner 5 and the gland 4 is arranged in the inclined groove 421 .

[0031] In this embodiment, the internal mechanical seal device with a deviation correction function and the slurry circulation pump thereof are provided with an "O" ring 6 between the sealing gland 4 and the liner 5 to achieve good sealing between the sealing gland 4 and the liner 5, and an annular groove 41 is provided on the sealing gland, and a protective gasket 42 of a flexible material is provided in the annular groove 41. In addition, an inclined groove 421 is provided on the protective gasket 42, which can prevent the placed "O" ring 6 from falling off during the transportation and flipping of the mechanical seal. The protective "O" ring 6 is accidentally damaged due to dislocation installation. The service life of the mechanical seal as a whole is improved. At the same time, since the protective gasket 42 is made of a flexible material, when the sealing gland 4 is corrected and installed: when encountering a large gap, the "O" ring 6 can release pressure to expand and fill the gap to eliminate the gap. When encountering an excess part of the "O" ring 6, it can be cut off or the "O" ring 6 can be compressed without generating rigid resistance. Specifically, when correcting the deviation: when encountering excess corners, they can be cut off, and when encountering a large gap to fill, the gap can be filled to eliminate the gap. Prevent the "O" ring 6 from being squeezed out and damaged. Therefore, it can better ensure the connection between the sealing cover 4 and the floating ring 3, and then ensure the seal between the dynamic and static friction sealing end faces between the floating ring 3 and the static sealing component. Ensure that the end faces of the dynamic and static sealing components of the mechanical seal always maintain a good fit, avoid the influence of the mechanical seal compensation end face deflection on the stable running-in of the end faces of the floating ring 3 and the rotating ring 22, ensure the stable operation of the sealing friction end face and reliable mechanical sealing performance; thereby ensuring the safe operation of the slurry circulation pump. It solves the problem of slurry leakage in the prior art; it also cannot ensure the stable operation of the slurry circulation pump, affecting the effect of flue gas desulfurization, and in serious cases, it is necessary to reduce the unit load.

[0032] Furthermore, the inclined groove 421 includes a first groove body parallel to the axis of the pump shaft 1 and a second groove body inclined at an angle relative to the first groove body. The two groove bodies are arranged at a certain inclined angle, so that the "O" ring 6 can be better placed, thereby achieving a better sealing effect.

[0033] Further, see Figure 3 As shown, the angle between the first groove body and the second groove body is 120°-135°. The setting of this angle is convenient for molding and can better store the "O" ring 6. It should be noted that the solid line is the state of the "O" ring 6 being compressed. The dotted line is the state of the "O" ring 6 after the pressure is released.

[0034] Further, the static seal assembly 2 includes a sleeve 21 and a rotating ring 22. The sleeve 21 is sleeved on the pump shaft 1 and rotates together with the pump shaft 1. The rotating ring 22 is coaxially arranged with the sleeve 21 and connected through the transmission pin 7. Specifically, the static seal assembly 2 also includes a first O-type static seal ring 23 arranged between the sleeve 21 and the rotating ring 22 and a second O-type static seal ring 24 arranged between the pump shaft 1 and the sleeve 21. Both static seals play a further mechanical sealing effect.

[0035] Furthermore, it also includes a rear pressure cover 8, which is arranged on the side of the sealing pressure cover 4 and the floating ring 3 away from the mechanical seal compensation end face, and the rear pressure cover 8 is used to limit the axial position of the sealing pressure cover 4 and the floating ring 3 to prevent the sealing pressure cover 4 and the floating ring 3 from deviating from the static seal assembly 2.

[0036] Furthermore, the floating ring 3 abuts against the rotating ring 22 , and the sealing cover 4 presses the floating ring onto the rotating ring 22 via a spring 9 , and one end of the spring 9 is disposed on the rear cover 8 , and the other end abuts against the sealing cover 4 .

[0037] It should be noted that a push ring 43 is further provided on the right inner side of the sealing gland 4 , the spring 9 abuts against the push ring 43 , and the push ring 43 abuts against the floating ring 3 .

[0038] Furthermore, a sealing ring 10 is provided between the outer side wall of the floating ring and the sealing gland 4, which plays a role of further sealing.

[0039] Furthermore, it also includes an axial positioning block 11. The axial positioning block 11 is arranged on one end face of the rear gland 8, and the axial positioning block 11 can fix the static seal assembly 2 and the floating ring 3 in the axial and radial directions through bolts (the axial first fixing bolt 111 is positioned axially and the radial first fixing bolt 112 is positioned radially) to form a rigid whole. When used during static installation: the mechanical seal sleeve and the non-rotating parts are synthesized into a rigid whole; and it is ensured that the sealing gland is concentric with the sleeve, and the sealing friction end face is perpendicular and concentric with the center of the sleeve. The static installation here refers to the role played during the transportation process when the pump body itself is not in use. Before the pump body is used, the positioning bolts on the axial positioning block 11 and the axial positioning block 11 must be removed.

[0040] Furthermore, it also includes a first fixing bolt 12, which is used to fix the sealing gland 4 on the liner 5 of the pump housing. The first fixing bolt 12 is a special first fixing bolt 12, and also includes a fixing nut 13 that matches the first fixing bolt 12. In addition, a second fixing bolt 14 is also provided above the pump body, which also plays a fixing role. The combined action of the first fixing bolt 12 and the second fixing bolt 14 can keep the sealing gland concentric with the sleeve, and the sealing friction end face perpendicular and concentric with the center of the sleeve during the sealing operation.

[0041] In this embodiment, the above-mentioned design enables the mechanical seal to work stably under the best installation accuracy and the best operation accuracy, so as to exert the best performance of the mechanical seal.

[0042] Prevent leakage during the service life and ensure the desulfurization slurry circulation pump can achieve maximum performance.

[0043] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present utility model, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0046] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0047] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An internal mechanical sealing device with a deviation correction function, characterized in that: The invention comprises a static seal assembly (2) which is sleeved on a pump shaft (1) and rotates together with the pump shaft (1), and a floating ring (3) which is arranged on one side of the static seal assembly (2); the static seal assembly (2) rotates relative to the floating ring (3); the floating ring (3) abuts against one end face of the static seal assembly (2) through a sealing gland (4); and the adjacent end faces of the static seal assembly (2) and the floating ring (3) are mechanical seal compensation end faces; the sealing gland (4) is fixedly mounted on a liner (5) of a pump housing; An annular step is provided at one end of the sealing gland (4) close to the liner (5); an annular groove (41) is provided on the axial side wall of the annular step inwardly along the radial direction of the sealing gland (4); a protective gasket (42) is arranged in the annular groove (41); an inclined groove (421) is provided inwardly along the side close to the sealing gland (4) on the outer side of the protective gasket (42); and the protective gasket (42) is made of a flexible material; An O-ring (6) for sealing the liner (5) and the sealing gland (4) is provided in the inclined groove (421).

2. The internal mechanical sealing device with deviation correction function according to claim 1, characterized in that: The inclined groove (421) comprises a first groove body parallel to the axis of the pump shaft (1) and a second groove body inclined at an angle relative to the first groove body.

3. The internal mechanical sealing device with deviation correction function according to claim 2, characterized in that: The included angle between the first slot body and the second slot body is 120°-135°.

4. The internal mechanical sealing device with deviation correction function according to claim 3, characterized in that: The static seal assembly (2) comprises a shaft sleeve (21) and a rotating ring (22); the shaft sleeve (21) is sleeved on the pump shaft (1) and rotates together with the pump shaft (1); the rotating ring (22) is coaxially arranged with the shaft sleeve (21) and connected via a transmission pin (7).

5. The internal mechanical sealing device with deviation correction function according to claim 4, characterized in that: It also includes a rear gland (8), which is arranged on a side of the sealing gland (4) and the floating ring (3) away from the mechanical seal compensation end face, and the rear gland (8) is used to limit the axial position of the sealing gland (4) and the floating ring (3) to prevent the sealing gland (4) and the floating ring (3) from deviating from the static seal assembly (2).

6. The internal mechanical sealing device with deviation correction function according to claim 5, characterized in that: The floating ring (3) is abutted against the rotating ring (22), and the sealing cover (4) presses the floating ring onto the rotating ring (22) via a spring (9), and one end of the spring (9) is arranged on the rear cover (8) and the other end abuts against the sealing cover (4).

7. The internal mechanical seal device with deviation correction function according to claim 6, characterized in that: A sealing ring (10) is provided between the outer side wall of the floating ring and the sealing gland (4).

8. The internal mechanical sealing device with deviation correction function according to claim 7, characterized in that: Also includes an axial positioning block (11); The axial positioning block (11) is arranged on one end surface of the rear gland (8), and the axial positioning block (11) can fix the static seal assembly (2) and the floating ring (3) in the axial and radial directions by bolts to form a rigid whole.

9. The internal mechanical sealing device with deviation correction function according to claim 1, characterized in that: It also comprises a first fixing bolt (12), wherein the first fixing bolt (12) is used to fix the sealing gland (4) on the liner (5) of the pump housing.

10. A slurry circulation pump, characterized in that: It comprises an internal mechanical seal device with a deviation correction function as claimed in any one of claims 1 to 9, a pump housing and a pump shaft (1).

Images