Improved mechanical seal for a slurry pump

Abstract

The utility model relates to the field of mechanical seal, specifically disclose an improved mechanical seal of slag slurry pump, including the shaft, the ring and the static ring, still include the residue separation mechanism, it includes the concentric first ring filter screen and second ring filter screen, the first ring filter screen mesh number is less than the second ring filter screen, be provided with the fixed ring of fixed filter screen on the ring, be provided with the fixed friction ring of limiting filter screen on the static ring. The utility model passes through the first ring filter screen and second ring filter screen construction to filter the liquid between the ring and the static ring, thereby reducing the solid small particle in liquid, reduce small particle to enter the sealing gap, slow down the wear and tear problem between the ring and the static ring, prolong the equipment's overhaul time, in the centrifugal pump shell environment, the big solid particle in the slurry liquid many will be thrown to the pump shell edge because of centrifugal force, namely only smaller particle can contact the first ring filter screen and second ring filter screen with liquid.

Description

Technical Field

[0001] This utility model relates to mechanical seal technology, specifically an improved mechanical seal for a slurry pump. Background Technology

[0002] As is well known, a slurry pump is a type of centrifugal pump that uses a rotating impeller to throw liquid to the outer edge to gain energy for transportation. The impeller and pump casing of a slurry pump have a relatively large gap, making it suitable for transporting liquids containing particles such as slag liquid and mud.

[0003] For example, the utility model patent with application publication number CN213684662U, application publication date July 13, 2021, entitled "A Mechanical Seal for a Gold Mine Slurry Pump," includes a stationary ring, a transmission seat, and a rotating ring. The transmission seat is configured as a cylindrical structure, and an annular convex plate is integrally formed on the inner wall of the transmission seat. The cross-section of the end of the annular convex plate is arc-shaped. The end of the annular convex plate away from the transmission seat is connected to the rotating ring, and the end of the rotating ring is connected to the stationary ring. A limit ring is installed on the outer side of the annular convex plate between the transmission seat and the rotating ring, and a spring is installed on the outer side of the limit ring. This mechanical seal for a gold mine slurry pump facilitates the installation of the limit ring and the spring. By setting its installation in a detachable connection manner, if the limit ring and the spring are damaged during long-term use, they can be easily replaced without affecting the use of the mechanical seal. The sealing ring and the annular convex plate at its end ensure good sealing performance and effectively prevent the spring from being corroded due to contact between the liquid and the spring.

[0004] The shortcoming of the existing technology is that, although slurry pumps also use mechanical seals to seal the pump casing and bearings, compared with centrifugal pumps that simply transport liquids, the liquids they transport contain solid particles, which makes it easier for foreign objects to enter the sealing gaps of slurry pumps. The abrasive wear caused by these foreign objects as abrasives leads to greater wear on the mechanical seals of slurry pumps, resulting in slurry pumps requiring more frequent maintenance compared to centrifugal pumps that transport liquids. Utility Model Content

[0005] The purpose of this invention is to provide an improved mechanical seal for a slurry pump to address the aforementioned shortcomings in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an improved mechanical seal for a slurry pump, comprising a rotating shaft, a rotating ring, and a stationary ring, and further comprising a slag separation mechanism, which includes a concentric first ring filter screen and a second ring filter screen, wherein the mesh size of the first ring filter screen is smaller than that of the second ring filter screen, a fixing ring for fixing the filter screen is provided on the rotating ring, and a fixing friction ring for restricting the filter screen is provided on the stationary ring.

[0007] As a further description of the above technical solution: the first ring filter screen has a plurality of liquid-facing portions arranged in a circumferential array, and the liquid-facing portions are oriented toward the rotation direction of the rotating shaft.

[0008] As a further description of the above technical solution: the first ring filter screen has a liquid outlet arc corresponding to the liquid receiving part, and the mesh number of the liquid outlet arc is greater than that of the liquid receiving part.

[0009] As a further description of the above technical solution: the first ring filter screen has a liquid outlet groove in a circular array at its first end, and the second ring filter screen has a guide arc ring facing the junction of the moving ring and the stationary ring.

[0010] As a further description of the above technical solution: the rotating shaft is provided with a base for fixing the moving ring, and the fixing ring is disposed on the base.

[0011] As a further description of the above technical solution: the mesh size of the first ring filter is 50~100 mesh.

[0012] As a further description of the above technical solution: the mesh size of the second ring filter is 100~300 mesh.

[0013] As a further description of the above technical solution: both the first ring filter and the second ring filter are twill-woven stainless steel mesh.

[0014] In the above technical solution, the improved mechanical seal of the slurry pump provided by this utility model has the following beneficial effects: the concentric first ring filter and second ring filter structure filter the liquid entering between the moving ring and the stationary ring, thereby reducing small solid particles in the liquid, reducing the number of small particles entering the sealing gap, slowing down the wear problem between the moving ring and the stationary ring, and extending the maintenance time of the equipment. In the centrifugal pump casing environment, most of the large solid particles in the slurry will be thrown to the edge of the pump casing due to centrifugal force, that is, only the smaller particles can contact the first ring filter and the second ring filter with the liquid. The friction of large particles in the first ring filter is reduced, extending the service life. After the liquid passes through the first ring filter, the particles are even smaller, thereby protecting the second ring filter with a larger mesh size and reducing the friction of large particles. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0016] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model; Figure 2 An exploded view of the overall structure provided for an embodiment of this utility model; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic cross-sectional view of the overall structure of an embodiment of the present utility model; Figure 5 for Figure 4 Enlarged view of point B in the middle; Figure 6 This is a cross-sectional schematic diagram of the slag-separating mechanism provided in an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Rotating shaft; 11. Base; 111. Moving ring; 112. Spring; 12. Stationary ring; 2. Slag separation mechanism; 21. First ring filter screen; 211. Liquid receiving part; 212. Liquid outlet arc; 213. Liquid outlet groove; 22. Second ring filter screen; 221. Guide arc ring; 222. Release groove; 23. Fixed friction ring; 24. Fixed ring. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0019] Please see Figure 1-6 This utility model provides a technical solution, including the following embodiments: Example 1 like Figure 1 , Figure 2 and Figure 4 As shown in the figure, this embodiment sets a double-layered annular filter screen on the existing mechanical seal, namely the slag separation mechanism 2. The slag separation mechanism 2 is composed of a concentric first ring filter screen 21 and a second ring filter screen 22. It filters the liquid entering between the moving ring 111 and the stationary ring 12, thereby reducing the number of small solid particles in the liquid and reducing the number of small particles entering the sealing gap. This reduces the wear problem between the moving ring 111 and the stationary ring 12 and extends the maintenance time of the equipment. In the centrifugal pump casing environment, most of the large solid particles in the slurry will be thrown to the edge of the pump casing due to centrifugal force. That is, only the smaller particles can come into contact with the first ring filter screen 21 and the second ring filter screen 22 with the liquid. The friction of large particles in the first ring filter screen 21 is reduced, extending its service life. After the liquid passes through the first ring filter screen 21, the particles are even smaller, thereby protecting the second ring filter screen 22 with a larger mesh size and reducing the friction of large particles.

[0020] Specifically, a base 11 is provided on the rotating shaft 1, and a rotating ring 111 is slidably disposed along the axis of the base 11. A compensating spring 112 is provided between the rotating ring 111 and the base 11. The spring 112 can be a large spring to accommodate a small pump casing. Figure 1 , Figure 2 and Figure 4 The large-sized pump housing shown has multiple springs 112 arranged circumferentially.

[0021] Furthermore, the first ring filter screen 21 has a mesh size of 50-100 mesh, and the second ring filter screen 22 has a mesh size of 100-300 mesh. The mesh size varies according to the size of the mechanical seal to suit different sizes of slurry pumps.

[0022] Furthermore, a fixed ring 24 is fixedly installed on the moving ring 111 by screws. The first ring filter 21 and the second ring filter 22 are both fixed to the fixed ring 24 by snap-fit. A fixed friction ring 23 is provided on the stationary ring 12. The first ring filter 21 and the second ring filter 22 are restricted by the fixed friction ring 23. A ceramic wear-resistant layer is provided on the side of the fixed friction ring 23 that contacts the first ring filter 21 and the second ring filter 22.

[0023] Preferably, the rotating shaft 1 is provided with a base 11 for fixing the moving ring 111. The base 11 is fixedly connected to the rotating shaft 1 by screws, and the fixing ring 24 is provided on the base 11 to complete the installation.

[0024] Example 2 like Figure 1-6 As shown, the first ring filter 21 has several liquid-receiving parts 211 arranged in a circular array. The liquid-receiving parts 211 face the rotation direction of the rotating shaft 1. When the rotating shaft 1 rotates, the liquid-receiving parts 211 can guide the centrifuged liquid into the space between the first ring filter 21 and the second ring filter 22, increasing the interaction of the liquid and cooling the moving ring 111 and the stationary ring 12, thus overcoming the problem that the liquid is not easy to interact after adding the filter.

[0025] Furthermore, both the first ring filter 21 and the second ring filter 22 are made of twill-woven stainless steel. Twill weave is softer than plain weave, which can give the filter better elasticity and adapt to the compensating movement between the moving ring 111 and the stationary ring 12.

[0026] Furthermore, during the processing of the liquid-receiving part 211, the first ring filter screen 21 with twill weave is broken by extrusion, thereby forming the liquid outlet arc 212 corresponding to the liquid-receiving part 211 on the first ring filter screen 21. The two are done in one process. During extrusion, the part that is stretched is the liquid-receiving part 211, which increases the pore size of the liquid-receiving part 211 and decreases the mesh size. This results in the liquid outlet arc 212 having a larger mesh size than the liquid-receiving part 211, making it easier for liquid to enter the first ring filter screen 21 and the second ring filter screen 22, but difficult to exit from the liquid-receiving part 211. This guides the liquid to interact and further assists the cooling of the moving ring 111 and the stationary ring 12.

[0027] Example 3 like Figure 1-6 As shown, the first end of the first ring filter 21 (such as...) Figure 3 As shown, the first end is the upper end and the second end is the lower end. The upper end (facing the impeller inside the pump casing) is provided with a liquid outlet groove 213 in a circumferential array. The liquid outlet groove 213 facilitates the discharge of liquid from the first ring filter screen 21 and the second ring filter screen 22. The discharge part is located at the upper end, which restricts the flow of liquid in the first ring filter screen 21 and the second ring filter screen 22, further increasing the cooling efficiency.

[0028] Furthermore, the second ring filter 22 is provided with a guide arc 221 facing the junction of the moving ring 111 and the stationary ring 12. Figure 5 As shown, the second ring filter 22 has two arc-shaped rings. The junction of the arc-shaped rings faces the junction of the moving ring 111 and the stationary ring 12, thereby guiding the liquid to be squeezed along the arc-shaped rings towards the moving ring 111 and the stationary ring 12. The second ring filter 22 has a release groove 222, which corresponds to the liquid outlet arc 212, to facilitate liquid discharge, restrict the trajectory of the liquid, and increase the cooling efficiency.

[0029] Furthermore, such as Figure 5 As shown, the slopes of the two arc-shaped rings of the second ring filter 22 are large and small, respectively. The arc-shaped ring with a larger slope is far away from the liquid outlet arc 212, which makes it easier for impurities entering between the first ring filter 21 and the second ring filter 22 to be discharged from the liquid outlet arc 212 along the arc of the effective slope, reducing the occurrence of impurity accumulation.

[0030] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An improved mechanical seal for a slurry pump, comprising a rotating shaft (1), a rotating ring (111), and a stationary ring (12), characterized in that, It also includes a slag separation mechanism (2), which includes a concentric first ring filter (21) and a second ring filter (22). The mesh number of the first ring filter (21) is smaller than that of the second ring filter (22). A fixed ring (24) for fixing the filter is provided on the moving ring (111), and a fixed friction ring (23) for restricting the filter is provided on the stationary ring (12).

2. The improved mechanical seal for a slurry pump according to claim 1, characterized in that, The first ring filter (21) has a plurality of liquid-receiving parts (211) arranged in a circular array, and the liquid-receiving parts (211) are oriented toward the rotation direction of the rotating shaft (1).

3. The improved mechanical seal for a slurry pump according to claim 2, characterized in that, The first ring filter (21) has a liquid outlet arc (212) corresponding to the liquid receiving part (211), and the mesh number of the liquid outlet arc (212) is greater than that of the liquid receiving part (211).

4. The improved mechanical seal for a slurry pump according to claim 1, characterized in that, The first ring filter (21) has a liquid outlet groove (213) arranged in a circular array at its first end, and the second ring filter (22) has a guide arc (221) facing the junction of the moving ring (111) and the stationary ring (12).

5. The improved mechanical seal for a slurry pump according to claim 1, characterized in that, The rotating shaft (1) is provided with a base (11) for fixing the moving ring (111), and the fixing ring (24) is provided on the base (11).

6. The improved mechanical seal for a slurry pump according to claim 1, characterized in that, The first ring filter (21) has a mesh size of 50 to 100.

7. The improved mechanical seal for a slurry pump according to claim 1, characterized in that, The second ring filter (22) has a mesh size of 100 to 300.

8. The improved mechanical seal for a slurry pump according to claim 1, characterized in that, Both the first ring filter (21) and the second ring filter (22) are twill-woven stainless steel mesh.

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