Mechanical sealing device of desulfurization slurry circulating pump

Abstract

The utility model relates to a mechanical sealing device of a desulfurization slurry circulating pump, belongs to the technical field of desulfurization slurry circulating pump sealing, and solves the problem that an existing mechanical sealing device is relatively short in service life. The driving seat comprises a driving seat shaft sleeve sleeved on a shaft, and the other end of the driving seat shaft sleeve is provided with a second clamping mechanism used for clamping the driving seat shaft sleeve on the shaft. The second clamping mechanism comprises at least two clamping blocks, each clamping block is inserted into the driving seat shaft sleeve in the radial direction, the inner side face of each clamping block is provided with an arc-shaped face matched with the outer wall face of the shaft, and the outer side face of each clamping block is slidably connected with a wedge block which can eject the clamping block out and extrude the clamping block on the shaft. The wedge block is installed in the driving seat shaft sleeve in a sliding mode, one end of the wedge block is rotationally connected with a pushing bolt, and the pushing bolt is in threaded connection with the driving seat shaft sleeve. According to the mechanical sealing device, the driving seat shaft sleeve is stressed more uniformly, and the service life of the mechanical sealing device is further prolonged.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of desulfurization slurry circulating pump sealing, more particularly, it relates to a mechanical sealing device of a desulfurization slurry circulating pump. BACKGROUND

[0002] In thermal power plants, according to the requirements of environmental protection emission, thermal power generation groups must be equipped with flue gas desulfurization system, and the desulfurization slurry circulating pump is a more critical part of the desulfurization system, and its sealing will determine the desulfurization effect. For the sealing of the desulfurization slurry circulating pump, a mechanical sealing device is usually used for sealing. The existing mechanical sealing device can solve the problems of "cavitation, vacuum, air pocket" and other phenomena of large desulfurization slurry circulating pump from time to time, or the problems of sudden fracture of friction pair caused by the aggravation of pump vibration and axial movement due to the wear and damage of bearings and other parts during use. However, the installation of the drive seat shaft sleeve is through the mutual cooperation and connection of the right clamping ring and the left clamping ring to lock the clamping ring on the drive seat shaft sleeve, so that the drive seat shaft sleeve is tightly attached to the shaft to avoid its separation and ensure the relative static and sealing effect between the two. That is, the drive seat shaft sleeve is fixed on one side of the shaft, and the other side lacks a fixed point, which is easy to cause uneven stress of the drive seat shaft sleeve and damage problems, and the O-shaped sealing ring is also easy to be damaged after long-term use, resulting in the problem of reducing the service life of the entire mechanical sealing device. Therefore, a new type of mechanical sealing device of a desulfurization slurry circulating pump needs to be designed to solve the above technical problems. CONTENT OF THE INVENTION

[0003] The purpose of the present disclosure is to provide a mechanical sealing device of a desulfurization slurry circulating pump, so that the stress of the drive seat shaft sleeve is more uniform, and the service life of the mechanical sealing device is further prolonged.

[0004] In order to achieve the above-mentioned purpose, the present disclosure provides a mechanical sealing device of a desulfurization slurry circulating pump, which comprises a drive seat shaft sleeve sleeved on a shaft, one end of the drive seat shaft sleeve is provided with a first clamping mechanism for clamping it on the shaft, and the other end of the drive seat shaft sleeve is provided with a second clamping mechanism for clamping it on the shaft. The second clamping mechanism comprises at least two clamping blocks, each clamping block is radially inserted into the drive seat shaft sleeve, the inner side surface of each clamping block has an arc surface matched with the outer wall surface of the shaft, the outer side surface of each clamping block is slidably connected with a wedge block which can be pushed out and pressed on the shaft, the wedge block is slidably installed in the drive seat shaft sleeve, one end of the wedge block is rotatably connected with a push bolt, the push bolt is threadedly connected with the drive seat shaft sleeve, the push bolt extends along the axial direction of the drive seat shaft sleeve, and the nut end of the push bolt extends in the direction of the first clamping mechanism.

[0005] Optionally, the drive seat sleeve is sleeved with a spring seat with a liquid inlet hole, the spring seat is sealed with the drive seat sleeve outer wall through a skeleton oil seal, and the end face of the spring seat is sealed with a sealing seat, the inner wall of the sealing seat is sealed with the outer wall of the static ring, the inner end face of the static ring is against the push ring, the push ring is against the spring seat through the spring, the outer end face of the static ring is in contact with the movable ring and can slide relative to the movable ring, the movable ring is connected to the protrusion on the end of the drive seat sleeve, and the drive seat sleeve outer wall is sealed with the spring seat, the sealing seat, the movable ring and the static ring; a flow guide sleeve is arranged in the sealing cavity, one end of the flow guide sleeve is arranged on the inner wall of the spring seat, and the other end of the flow guide sleeve extends below the contact position of the static ring and the movable ring.

[0006] Optionally, the drive seat sleeve is provided with a sliding cavity, a through radial hole is formed in the bottom of the drive seat sleeve of the sliding cavity, the wedge block is slidably installed in the sliding cavity, and the clamping block is slidably inserted into the radial hole.

[0007] Optionally, a limiting groove is arranged on the inclined surface of the wedge block, and a limiting block is arranged on the inclined surface; the cross sections of the limiting groove and the limiting block are triangular, and the limiting block is slidably installed in the limiting groove.

[0008] Optionally, a clamping portion is arranged at the highest end of the inclined surface of the wedge block, the clamping portion is provided with a recess and an opening connected in the radial direction, the screw rod of the push bolt is provided with a boss, and the boss is movably inserted into the recess through the opening.

[0009] Optionally, a pressing bolt is further threadedly connected in the drive seat sleeve on one side of the push bolt, the screw rod of the pressing bolt is pressed against the end face of the nut of the push bolt, and the nut end of the pressing bolt extends to the stepped surface of the drive seat sleeve.

[0010] Optionally, the first clamping mechanism comprises a clamping ring, a left clamping ring and a right clamping ring, the clamping ring is sleeved on the end of the drive seat sleeve away from the static ring, and the clamping ring is locked through the right clamping ring and the left clamping ring connected with each other.

[0011] Optionally, the clamping ring is composed of two half-arc-shaped clamping rings, one end of the drive seat sleeve is provided with an annular limiting protrusion, the outer wall surface of the annular limiting protrusion is a spherical surface, and a plurality of notches are formed in the one end of the drive seat sleeve, and a circular cavity is arranged in the groove bottom of each notch.

[0012] Optionally, the movable ring is connected to the end protrusion of the drive seat sleeve through a transmission pin, and a fluorine sleeve is sleeved on one end of the transmission pin connected to the movable ring.

[0013] Optionally, a sealing ring is arranged between the other end of the driving seat sleeve and the shaft, and the second clamping mechanism is arranged on the driving seat sleeve between the first clamping mechanism and the sealing ring.

[0014] The technical scheme has the beneficial effects that: the first clamping mechanism and the second clamping mechanism are used to clamp the two ends of the driving seat sleeve on the shaft respectively, and the driving seat sleeve is subjected to force at two points, so that the driving seat sleeve is subjected to force more uniformly, and the service life of the mechanical sealing device is further prolonged. Specifically, the second clamping mechanism uses the axially arranged push bolt to drive the wedge block to move axially, so as to push out the clamping block and press the shaft, and the other end of the driving seat sleeve is clamped on the shaft. On the one hand, after the driving seat sleeve is installed, the operation can be conveniently performed on one side of the first clamping mechanism, and the installation is more convenient. On the other hand, the cooperation of the wedge block and the push bolt can lock the clamping block, effectively prevent the clamping block from loosening, and further improve the stability of the installation. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation on the present disclosure. In the drawings:

[0016] Figure 1 It is a structural schematic diagram of the mechanical sealing device of the present disclosure;

[0017] Figure 2 It is a structural schematic diagram of the mechanical sealing device of the present disclosure; Figure 1 It is an enlarged structural schematic diagram of the structure at A in FIG. 1;

[0018] Figure 3 It is an enlarged structural schematic diagram of the structure at B in FIG. 1; Figure 2

[0019] It is an enlarged structural schematic diagram of the structure at C in FIG. 1; Figure 4 Figure 2 It is an enlarged structural schematic diagram of the structure at C in FIG. 1;

[0020] Figure 5 It is an enlarged structural schematic diagram of the structure at C in FIG. 1;

[0021] Figure 6 It is a perspective structural schematic diagram of the clamping block in the embodiment of the present disclosure;

[0022] Figure 7 It is a perspective structural schematic diagram of the clamping block in the embodiment of the present disclosure;

[0023] Figure 8 It is a side view structural enlarged schematic diagram of the clamping ring in the embodiment of the present disclosure.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] ​1-sealing ring, 2-clamping block, 3-dynamic ring, 4-static ring, 5-wedge, 6-push bolt, 7-push ring, 8-spring seat, 9-sliding cavity, 10-fixed block, 11-right clamping ring, 12-left clamping ring, 13-inclined surface, 14-clamping ring, 15-skeleton oil seal pressure plate, 16-pressure bolt, 17-skeleton oil seal, 18-spring, 19-annular limiting protrusion, 20-sealing seat, 21-notch, 22-clamping ring, 23-drive seat sleeve, 24-transmission pin, 25-limiting block, 26-boss, 27-PTFE sleeve, 28-guide sleeve, 29-circular cavity, 51-limiting groove, 52-groove, 53-opening. DETAILED DESCRIPTION

[0026] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0027] In the description of this disclosure, it is to be understood that the terms "upper" and "lower" indicate positions or locations based on the Figure 1 The directions of the drawings shown are defined solely for the purpose of facilitating and simplifying the description of the present disclosure. They do not indicate or imply that the devices or elements referred to must have a specific orientation, configuration, or operation in a specific orientation. Therefore, they should not be construed as limiting the present disclosure. Furthermore, the terms "inside" and "outside" refer to the inside and outside of the corresponding structural outlines. Furthermore, the terms "first," "second," etc., are used solely to distinguish one element from another and do not convey order or importance.

[0028] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "disposed," "connected," "connected," and "installed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections via an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0029] refer to Figures 1-8 In a specific embodiment of the present disclosure, a mechanical sealing device for a desulfurization slurry circulation pump is provided, including a drive seat sleeve 23 sleeved on a shaft, a first clamping mechanism for clamping the drive seat sleeve 23 on the shaft is provided at one end thereof, and a second clamping mechanism for clamping the drive seat sleeve 23 on the shaft is provided at the other end thereof.

[0030] The mechanical sealing device provided by the present disclosure adopts a first clamping mechanism and a second clamping mechanism to clamp the two ends of the drive seat shaft sleeve 23 on the shaft, respectively, so that the drive seat shaft sleeve 23 is subjected to force at two points, and the force on the drive seat shaft sleeve 23 is more uniform, thereby further prolonging the service life of the mechanical sealing device.

[0031] Optionally, referring to Figure 4 As shown in the figure, the second clamping mechanism includes at least two clamping blocks 2, each of which is radially inserted into the drive seat shaft sleeve 23, and the inner side surface of each clamping block 2 has an arc-shaped surface matched with the outer wall surface of the shaft, so as to facilitate clamping of the clamping block 2 on the shaft. The outer side surface of each clamping block 2 is slidably connected with a wedge block 5 that can be pushed out and pressed on the shaft. The wedge block 5 is slidably installed in the drive seat shaft sleeve 23. One end of the wedge block 5 is rotatably connected with a push bolt 6 that is threadedly connected with the drive seat shaft sleeve 23. The push bolt 6 extends along the axial direction of the drive seat shaft sleeve 23, and the nut end of the push bolt 6 extends towards the first clamping mechanism.

[0032] During installation, the wedge block 5 is axially moved by rotating the push bolt 6, and then the wedge block 5 presses the clamping block 2 to move towards the center of the shaft, so that the other end of the drive seat shaft sleeve 23 is clamped on the shaft. The second clamping mechanism adopts the push bolt 6 arranged in the axial direction to drive the wedge block 5 to move axially, so as to push out the clamping block 2 and press the shaft, thereby achieving the clamping of the other end of the drive seat shaft sleeve 23 on the shaft. On the one hand, after the installation of the drive seat shaft sleeve, the operation can be facilitated on one side of the first clamping mechanism, and the installation is more convenient. On the other hand, the cooperation of the wedge block and the push bolt can lock the clamping block 2, effectively prevent it from loosening, and further improve the stability of the installation.

[0033] Optionally, referring to Figure 4 and Figure 6 As shown in the figure, a sliding cavity 9 is arranged in the drive seat shaft sleeve 23. A through radial hole is formed in the bottom of the drive seat shaft sleeve 23. The wedge block 5 is slidably installed in the sliding cavity 9, and the clamping block 2 is slidably inserted into the radial hole, thereby achieving the installation of the wedge block 5 and the clamping block 2. An inclined surface 13 matched with the inclined surface of the wedge block 5 is arranged on the outer side surface of the clamping block 2, so that the wedge block 5 can better push out the clamping block 2.

[0034] Optionally, referring to Figure 6 and Figure 7 As shown in the figure, a limiting groove 51 is arranged on the inclined surface of the wedge block 5, and a limiting block 25 is arranged on the inclined surface 13. The cross sections of the limiting groove 51 and the limiting block 25 are triangular, and the limiting block 25 is slidably installed in the limiting groove 51. The limiting block 25 and the limiting groove 51 are used to connect the wedge block 5 and the clamping block 2, which can push out the clamping block 2 or retract the clamping block 2, and the disassembly and assembly are very convenient.

[0035] Optionally, referring toFigure 7 As shown, the highest end of the inclined surface of the wedge block 5 is provided with a connected groove 52 and an opening 53, and the end of the screw rod of the push bolt 6 is provided with a boss 26, the boss 26 is movably inserted into the groove 52 through the opening 53, and the push bolt 6 is rotatably installed in the wedge block 5 through the boss 26, which meets the rotation of the push bolt 6 relative to the wedge block 5 and facilitates the disassembly and maintenance of the wedge block 5.

[0036] Optionally, referring to Figure 2 As shown, the drive seat sleeve 23 on one side of the push bolt 6 is further threadedly connected with a compression bolt 16, the screw rod end of the compression bolt 16 is pressed against the end surface of the nut of the push bolt 6, and the nut end of the compression bolt 16 extends to the stepped surface of the drive seat sleeve 23. The push bolt 6 is compressed by the compression bolt 16, which can further prevent the problem of loosening of the clamping block 2.

[0037] Optionally, referring to Figure 2 and Figure 3 As shown, the first clamping mechanism includes a clamping ring 14, a left clamping ring 12 and a right clamping ring 11, wherein the drive seat sleeve 23 is sleeved with the clamping ring 14 at the end away from the static ring 4, the clamping ring 14 is locked by the right clamping ring 11 and the left clamping ring 12 connected with each other, and the one end of the drive seat sleeve 23 is clamped on the shaft.

[0038] Further, referring to Figure 8 As shown, the clamping ring 14 can be composed of two half-arc-shaped clamping rings, which facilitates the clamping ring 14 to be sleeved on the drive seat sleeve 23. Also referring to Figure 5 As shown, the drive seat sleeve 23 is provided with an annular limiting protrusion 19 at one end, and the outer wall surface of the annular limiting protrusion 19 is a spherical surface, which prevents the clamping ring 14 from being loosened due to axial displacement. In addition, a plurality of notches 21 are formed at one end of the drive seat sleeve 23, and each notch 21 is provided with a circular cavity 29 at the bottom, which improves the deformation capacity of the one end of the drive seat sleeve 23, so that the clamping ring 14 can better clamp the drive seat sleeve 23, and further prevent the loosening problem.

[0039] Optionally, referring to Figure 2As shown, the drive seat sleeve 23 is sleeved with a spring seat 8 with a liquid inlet hole, and the spring seat 8 and the outer wall of the drive seat sleeve 23 are sealed by a skeleton oil seal 17. The skeleton oil seal 17 is arranged on the inner wall of the outer end of the spring seat 8. A fixed block 10 is arranged on the outer end surface of the spring seat 8, and the fixed block 10 is connected to the spring seat 8 by a bolt. The end surface of the spring seat 8 is sealed with a sealing seat 20, the inner wall of the sealing seat 20 is sealed with the outer wall of the static ring 4, the inner end surface of the static ring 4 is abutted on the push ring 7, the push ring 7 is abutted on the spring seat 8 by a spring 18, the outer end surface of the static ring 4 is abutted on the dynamic ring 3 and can slide relative to the dynamic ring 3, and the dynamic ring 3 is connected to the protrusion on the end of the drive seat sleeve 23, so that the outer wall of the drive seat sleeve 23 and the spring seat 8, the sealing seat 20, the dynamic ring 3 and the static ring 4 form a sealed cavity. A flow guide sleeve 28 is arranged in the sealed cavity, one end of the flow guide sleeve 28 is arranged on the inner wall of the spring seat 8, and the other end of the flow guide sleeve 28 extends below the abutted position of the static ring 4 and the dynamic ring 3.

[0040] The flow guide sleeve 28 guides the cooling water, which can ensure that the cooling water can cool the main heat generation position (the friction surface of the two dynamic and static rings) of the seal, thereby improving the cooling effect and prolonging the service life of the seal. The static ring 4 and the dynamic ring 3 are both made of pressureless sintered silicon carbide material, which is better than conventional silicon carbide in pressure resistance, temperature resistance, corrosion resistance and other properties, and has a low friction coefficient, which improves the sealing performance of the seal and further prolongs the service life of the seal.

[0041] Optionally, the dynamic ring 3 is connected to the protrusion on the end of the drive seat sleeve 23 by a transmission pin 24, and a fluorine sleeve 27 is sleeved on one end of the transmission pin 24 connected to the dynamic ring 3. In this way, the impact force of the dynamic ring and the anti-rotation pin during the start of the seal can be relieved, and the carbonized silicon ring breakage phenomenon caused by the start can be effectively prevented, thereby improving the reliability of the seal. In addition, a clamping ring 22 is arranged on the outer wall of the drive seat sleeve 23 to limit the movement of the end of the dynamic ring 3.

[0042] Optionally, a sealing ring 1 is arranged between the other end of the drive seat sleeve 23 and the shaft, and the second clamping mechanism is arranged on the drive seat sleeve 23 between the first clamping mechanism and the sealing ring 1.

[0043] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0044] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not describe various possible combinations again.

[0045] Furthermore, various embodiments of the present disclosure can be arbitrarily combined with each other, as long as the combination does not violate the idea of the present disclosure, and it should be considered as disclosed in the present disclosure.

Claims

1. A mechanical seal device for a desulfurization slurry circulation pump, comprising a drive seat sleeve sleeved on a shaft, one end of the drive seat sleeve being provided with a first clamping mechanism for clamping it on the shaft, characterized in that: The other end of the drive seat sleeve is provided with a second clamping mechanism for clamping it on the shaft; the second clamping mechanism includes at least two clamping blocks, each of which is radially inserted in the drive seat sleeve, and the inner side surface of each clamping block has an arc surface that matches the outer wall surface of the shaft, and the outer side surface of each clamping block is slidably connected to a wedge block that can push it out and squeeze it onto the shaft, and the wedge block is slidably installed in the drive seat sleeve, and one end of the wedge block is rotatably connected to a pushing bolt, which is threadedly connected to the drive seat sleeve, and the pushing bolt extends along the axial direction of the drive seat sleeve, and one end of the nut of the pushing bolt extends in the direction of the first clamping mechanism.

2. The mechanical sealing device of the desulfurization slurry circulation pump according to claim 1, characterized in that: A sliding cavity is provided in the drive seat sleeve, and a radial hole is provided on the drive seat sleeve at the bottom of the sliding cavity. The wedge block is slidably installed in the sliding cavity, and the clamping block is slidably inserted in the radial hole. The outer side surface of the clamping block is provided with an inclined surface that is compatible with the inclined surface of the wedge block.

3. The mechanical sealing device of the desulfurization slurry circulation pump according to claim 2 is characterized in that: A limiting groove is provided on the inclined surface of the wedge block, and a limiting block is provided on the inclined surface. The cross sections of the limiting groove and the limiting block are both triangular, and the limiting block is slidably installed in the limiting groove.

4. The mechanical sealing device of the desulfurization slurry circulation pump according to claim 2, characterized in that: The highest end of the inclined surface of the wedge block is provided with a connected groove and an opening, and one end of the screw rod of the pushing bolt is provided with a boss, and the boss passes through the opening and is movably inserted into the groove.

5. The mechanical sealing device of the desulfurization slurry circulation pump according to claim 1, characterized in that: A clamping bolt is also threadedly connected in the driving seat sleeve on one side of the pushing bolt, one end of the screw rod of the clamping bolt is squeezed on the nut end face of the pushing bolt, and one end of the nut of the clamping bolt extends to the step surface of the driving seat sleeve.

6. The mechanical sealing device of the desulfurization slurry circulation pump according to claim 1, characterized in that: The first clamping mechanism includes a clamping ring, a left clamping ring and a right clamping ring. A clamping ring is sleeved on the end of the drive seat sleeve away from the static ring. The clamping ring is locked by the right clamping ring and the left clamping ring which are connected to each other.

7. The mechanical sealing device of the desulfurization slurry circulation pump according to claim 6, characterized in that: The clamping ring is composed of two half-shaped arc-shaped clamping rings, one end of the drive seat sleeve is provided with an annular limiting protrusion, the outer wall surface of the annular limiting protrusion is a spherical surface, and one end of the drive seat sleeve is provided with multiple slots, and the bottom of each slot is provided with a circular cavity.

8. The mechanical sealing device for a desulfurization slurry circulation pump according to any one of claims 2 to 7, characterized in that: The driving seat sleeve is outerly provided with a spring seat with a liquid inlet hole, and a seal is formed between the spring seat and the outer wall of the driving seat sleeve by a skeleton oil seal, and the end face of the spring seat is in affixed sealing with the sealing seat, the inner wall of the sealing seat is sealed with the outer wall of the static ring, the inner end face of the static ring is against the push ring, and the push ring is against the spring seat through a spring, the outer end face of the static ring is in affixed with the dynamic ring and can slide relatively, and the dynamic ring is connected to the protrusion at the end of the driving seat sleeve, so that a sealed cavity is formed between the outer wall of the driving seat sleeve and the spring seat, the sealing seat, the dynamic ring and the static ring; a guide sleeve is provided in the sealing cavity, one end of the guide sleeve is provided on the inner wall of the spring seat, and the other end extends to below the fitting point between the static ring and the dynamic ring.

9. The mechanical sealing device of the desulfurization slurry circulation pump according to claim 8, characterized in that: The dynamic ring is connected to the end protrusion of the drive seat sleeve through a transmission pin, wherein the end of the transmission pin connected to the dynamic ring is covered with a polyfluoroethylene sleeve.

10. The mechanical sealing device of a desulfurization slurry circulation pump according to claim 1, characterized in that: A sealing ring is provided between the other end of the drive seat sleeve and the shaft, and the second clamping mechanism is located on the drive seat sleeve between the first clamping mechanism and the sealing ring.

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