Structure for prolonging service life of mechanical seal of pump

Abstract

The utility model relates to the field of mechanical conveying equipment for fluid particles, in particular to a structure for prolonging the service life of a pump mechanical seal, which comprises a pump body and a first mechanical sealing element, a static ring of the first mechanical sealing element is arranged on the pump body, a moving ring of the first mechanical sealing element is arranged on a pump shaft, and a moving ring of a second mechanical sealing element is arranged on the pump shaft; the sealing cavity covers the outer side of the first mechanical sealing piece and is rotationally connected with the pump shaft, a static ring of the second mechanical sealing piece is arranged on the sealing cavity and is matched with a movable ring of the second mechanical sealing piece, and a lubricating agent is arranged in the sealing cavity. When the first mechanical sealing element breaks down and leaks, the mechanical sealing effect can still be achieved through the second mechanical sealing element, meanwhile, the lubricating agent is added into the sealing cavity, the mechanical sealing element can be lubricated, the pressure of the lubricating agent is higher than that of fluid, and therefore the problem of fluid leakage is solved.

Description

Technical Field

[0001] The present application relates generally to the field of mechanical conveying devices for fluid particles, and in particular to a structure for extending the life of a pump mechanical seal. Background Art

[0002] At present, in the industrial field, solid particle medium pumps are widely used in various fluid conveying systems. Their main function is to effectively pump media containing solid particles. These pumps play a vital role in mining, chemical, metallurgy and other industries. However, solid particle medium pumps in the prior art generally have a significant problem: the design and durability of mechanical seals are insufficient.

[0003] Existing solid particle medium pumps usually adopt a single mechanical seal structure. Although this structure simplifies the design and manufacturing cost of the pump to a certain extent, its disadvantages are also very obvious. First, since the pumping medium contains solid particles, these particles will cause friction and wear on the mechanical seal during the pumping process, which will significantly reduce the durability of the seal. Secondly, the wear of the mechanical seal will lead to a decrease in sealing performance, which will cause leakage problems in the pump, which not only affects the working efficiency of the pump, but also may pollute the production environment.

[0004] In order to solve this problem, operators need to frequently maintain and replace mechanical seals, which not only increases operating costs, but also reduces production efficiency due to downtime for maintenance. Therefore, the existing solid particle medium pumps have obvious technical defects in durability and maintainability, and an improved design is urgently needed to improve their sealing performance and service life. This technical improvement is of great significance to improving industrial production efficiency and reducing maintenance costs. Utility Model Content

[0005] In order to meet the problem that existing mechanical seals often exist alone and are affected by the wear of solid particle media when conveying solid particle media, resulting in reduced sealing and service life of the mechanical seals, the present application provides a structure for extending the life of the pump mechanical seal, thereby extending the service life of the mechanical seal and improving the stability of the solid particle medium pump.

[0006] According to one aspect of the present application, a structure for extending the service life of a pump mechanical seal is provided, the structure comprising: a pump body, a first mechanical seal, a static ring of the first mechanical seal being arranged on the pump body, a dynamic ring of the first mechanical seal being arranged on a pump shaft, a second mechanical seal being arranged on a side of the first mechanical seal close to a pump body driving portion, and a dynamic ring of the second mechanical seal being arranged on the pump shaft; and also comprising a sealing chamber, a cover being arranged on the outside of the first mechanical seal, an end of the sealing chamber away from the first mechanical seal being rotatably connected to the pump shaft, a static ring of the second mechanical seal being arranged on the sealing chamber and cooperating with the dynamic ring of the second mechanical seal, and a lubricant being arranged in the sealing chamber.

[0007] In some embodiments, the sealing chamber includes: a cylindrical shell, arranged between the impeller and the driving part of the pump body; a first through hole and a second through hole are respectively provided at both ends of the cylindrical shell; wherein the first through hole is arranged close to the impeller, the first through hole is installed with a first mechanical seal, and the second through hole is installed with a second mechanical seal.

[0008] In some embodiments, the cylindrical shell includes an upper cover and a cylinder; wherein the upper cover is bolted to the top of the cylinder; an annular protrusion is arranged on the inner wall of the lower end of the cylinder; the cylindrical shell also includes: a pressure plate, which is arranged in the cylinder and presses against the upper part of the annular protrusion; a first screw, which is threadedly connected to the pressure plate and the annular protrusion.

[0009] In some embodiments, a first sealing rubber ring is provided between the upper cover and the cylinder body; an annular sealing groove is provided on the circumferential outer wall of the pressure plate, and the annular sealing groove is concentrically arranged with the pressure plate; and a second sealing rubber ring is provided in the annular sealing groove.

[0010] In some embodiments, a grease injection hole is provided on the outer wall of the bottom end of the cylinder, and one end of the grease injection hole is connected to the inner wall of the cylinder; an air hole is provided on the surface of the upper cover, and the bottom end of the air hole is connected to the inner wall of the cylinder; the grease injection hole and one end of the air hole are both sealed by a sealing bolt.

[0011] In some embodiments, the pressure plate includes: a stepped cover body, a circumferential outer wall of the small diameter end connected to the inner wall of the annular protrusion, and a bottom surface of the large diameter end arranged on the top surface of the annular protrusion; a first through hole is arranged on the surface of the stepped cover body, concentrically arranged with the stepped cover body; a plurality of first threaded holes are arranged on the surface of the stepped cover body, and a static ring of the first mechanical seal is bolted to the first threaded hole; a dynamic ring of the first mechanical seal is arranged in the first through hole, and is sleeved on the circumferential outer wall of the pump shaft close to the first through hole.

[0012] In some embodiments, a second through hole is provided on the surface of the upper cover, concentrically arranged with the upper cover; a second threaded hole is also provided on the surface of the upper cover, and the static ring of the second mechanical seal is bolted to the second threaded hole, and the dynamic ring of the second mechanical seal is provided in the second through hole, and is sleeved on the circumferential outer wall of the pump shaft close to the second through hole.

[0013] The embodiments of the present application have the following advantages.

[0014] When the first mechanical seal fails, the second mechanical seal and the sealing chamber can continue to seal, thereby improving the problem of leakage of the transported medium. At the same time, the sealing chamber is filled with lubricant, so that the pressure in the sealing chamber is greater than the pressure in the fluid pipeline, so that the medium in the fluid pipeline will not leak into the sealing chamber, and then the leakage problem will not occur. When conveying solid particle media with relatively active chemical properties, inert lubricant can be filled in the sealing chamber to improve the problem of chemical reaction between the lubricant and the solid particle media. The lubricant is diversified and can be selected according to the transported medium. The lubricant in the sealing chamber can lubricate the first mechanical seal and the second mechanical seal at the same time. It only needs to replenish the lubricant in the sealing chamber regularly, which improves the problem of high-frequency maintenance required for traditional single mechanical seals.

[0015] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures particularly pointed out in the written description and the drawings.

[0016] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 A schematic diagram of installing a second mechanical seal according to an embodiment of the present application is shown.

[0019] Figure 2 A schematic diagram of the installation of a stationary ring and a dynamic ring according to an embodiment of the present application is shown.

[0020] Figure 3 A schematic diagram of a sealed cavity structure according to an embodiment of the present application is shown.

[0021] Reference numerals

[0022] 1- pump body; 2- first mechanical seal; 3- static ring; 4- dynamic ring; 5- second mechanical seal; 6- pump shaft; 7- sealing chamber; 8- impeller;

[0023] 71- cylindrical housing; 72- first through hole; 73- second through hole;

[0024] 711-upper cover; 712-barrel; 713-annular protrusion; 714-air hole; 715-first screw; 716-first sealing rubber ring; 717-annular sealing groove; 718-second sealing rubber ring; 719-grease injection hole;

[0025] 74 - pressure plate; 741 - first threaded hole; 742 - second threaded hole. DETAILED DESCRIPTION

[0026] In order to make the purpose, scheme and advantages of the technical solution of the present application clearer, the technical solution of the embodiment of the present application will be clearly and completely described in conjunction with the drawings of the specific embodiments of the present application. Unless otherwise specified, the terms used herein have the usual meanings in the art. The same reference numerals in the drawings represent the same components.

[0027] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] As described above, since there is only one mechanical seal on the pump shaft of a conventional pump body, this type of pump is affected by factors such as wear of the solid particle medium when conveying solid particle medium, resulting in aging of the mechanical seal and leakage of the solid particle medium. Conventional lubricants require high-frequency maintenance of the mechanical seal to maintain the sealing effect of the mechanical seal, which is time-consuming and labor-intensive.

[0029] In order to at least partially solve the above-mentioned problems and one or more of other potential problems, an example embodiment of the present application provides a structure for extending the service life of a pump mechanical seal, comprising: a pump body 1, a first mechanical seal 2, wherein a stationary ring 3 of the first mechanical seal 2 is arranged on the pump body 1, and a dynamic ring 4 is arranged on a pump shaft 6, a second mechanical seal 5 is arranged on the side of the first mechanical seal 2 close to the driving part of the pump body 1, and the dynamic ring 4 of the second mechanical seal 5 is arranged on the pump shaft 6; and also includes a sealing chamber 7, a cover is arranged on the outside of the first mechanical seal 2, and the sealing chamber 7 is rotatably connected to the pump shaft 6 at one end away from the first mechanical seal 2, the stationary ring 3 of the second mechanical seal 5 is arranged on the sealing chamber 7, and cooperates with the dynamic ring 4 of the second mechanical seal, and a lubricant is arranged in the sealing chamber 7.

[0030] In the above embodiment, when the sealing of the first mechanical seal 2 fails, the second mechanical seal 5 and the sealing chamber 7 can continue to seal, thereby improving the problem of leakage of the transported medium. At the same time, a lubricant is filled in the sealing chamber 7, so that the pressure in the sealing chamber 7 is greater than the pressure in the fluid pipeline, so that the medium in the fluid pipeline will not leak into the sealing chamber 7, and then the leakage problem will not occur. When conveying solid particle media with relatively active chemical properties, an inert lubricant can be filled in the sealing chamber 7, thereby improving the problem of chemical reaction between the lubricant and the solid particle media. The lubricant is diversified and can be selected according to the transported medium. The lubricant in the sealing chamber 7 can lubricate the first mechanical seal 2 and the second mechanical seal 5 at the same time. It only needs to replenish the lubricant in the sealing chamber 7 regularly, which improves the problem of high-frequency maintenance required for traditional single mechanical seals.

[0031] See also Figure 1-Figure 3 In some embodiments, the sealing chamber 7 includes: a cylindrical shell 71, which is arranged between the impeller 8 and the driving part of the pump body 1; a first through hole 72 and a second through hole 73 are respectively provided at both ends of the cylindrical shell 71; wherein the first through hole 72 is arranged close to the impeller 8, the first through hole 72 is installed with the first mechanical seal 2, and the second through hole 73 is installed with the second mechanical seal 5.

[0032] In the above embodiment, the cylindrical housing 71 is used to form a sealing cavity 7 between the first mechanical seal 2 and the second mechanical seal 5 , and lubricant is injected into the cylindrical housing 71 to lubricate the first mechanical seal 2 and the second mechanical seal 5 .

[0033] See also Figure 1-Figure 3 In some embodiments, the cylindrical shell 71 includes an upper cover 711 and a cylinder 712; wherein the upper cover 711 is bolted to the top of the cylinder 712; an annular protrusion 713 is arranged on the inner wall of the lower end of the cylinder 712; the cylindrical shell 71 also includes: a pressure plate 74, which is arranged in the cylinder 712 and presses against the upper part of the annular protrusion 713; a first screw 715, which is threadedly connected to the pressure plate 74 and the annular protrusion 713.

[0034] In the above embodiment, the upper cover 711 of the cylindrical shell 71 is bolted to the cylinder 712, so that when the first mechanical seal 2 is repaired, the upper cover 711 can be removed for repair, thereby improving the portability during repair. The annular protrusion 713 is bolted to the pressure plate 74 via the first screw 715.

[0035] See also Figure 1-Figure 3 In some embodiments, a first sealing rubber ring 716 is provided between the upper cover 711 and the cylinder 712 ; an annular sealing groove 717 is provided on the circumferential outer wall of the pressure plate 74 , and the annular sealing groove 717 is concentrically arranged with the pressure plate 74 ; a second sealing rubber ring 718 is provided in the annular sealing groove 717 .

[0036] In the above embodiment, when installing the upper cover 711 , the first sealing rubber ring 716 is placed on the top of the cylinder 712 , and then the upper cover 711 is fixed by bolts, and the upper cover 711 is fixed by the first sealing rubber ring 716 .

[0037] See also Figure 1-Figure 3 In some embodiments, a grease injection hole 719 is provided on the outer wall of the bottom end of the cylinder 712, and one end of the grease injection hole 719 is connected to the inner wall of the cylinder 712; an air hole 714 is provided on the surface of the upper cover 711, and the bottom end of the air hole 714 is connected to the inner wall of the cylinder 712; the grease injection hole 719 and one end of the air hole 714 are both sealed by a sealing bolt.

[0038] In the above embodiment, when injecting lubricant into the cylinder 712, the sealing bolts of the grease injection hole 719 and the air hole 714 are opened, and the lubricant is injected from the grease injection hole 719 until the lubricant in the cylinder 712 completely discharges the gas in the cylinder 712 from the air hole 714, and then continues to inject to increase the pressure in the cylinder 712. Then, the grease injection hole 719 and the air hole 714 are closed by the sealing bolts, and a pressure gauge can also be set at the air hole 714, so that the pressure change in the cylinder 712 can be observed by the pressure gauge and the lubricant can be replenished in time.

[0039] See also Figure 1-Figure 3 In some embodiments, the pressure plate 74 includes: a stepped cover body, a circumferential outer wall of the small diameter end connected to the inner wall of the annular protrusion 713, and a bottom surface of the large diameter end is arranged on the top surface of the annular protrusion 713; a first through hole 72 is arranged on the surface of the stepped cover body, and is concentrically arranged with the stepped cover body; a plurality of first threaded holes 741 are arranged on the surface of the stepped cover body, and the static ring 3 of the first mechanical seal 2 is bolted to the first threaded holes 741; the dynamic ring 4 of the first mechanical seal 2 is arranged in the first through hole 72, and is sleeved on the circumferential outer wall of the pump shaft 6 close to the first through hole 72.

[0040] In the above embodiment, the stepped cover body is composed of two layers of circular plates with different diameters, and the stepped cover body is connected to the annular protrusion 713 through the first screw 715 .

[0041] See also Figure 1-Figure 3 In some embodiments, the second through hole 73 is provided on the surface of the upper cover 711 and is concentric with the upper cover 711; a second threaded hole 742 is also provided on the surface of the upper cover 711, and the static ring 3 of the second mechanical seal 5 is bolted to the second threaded hole 742, and the dynamic ring 4 of the second mechanical seal 5 is provided in the second through hole 73 and is sleeved on the circumferential outer wall of the pump shaft 6 close to the second through hole 73.

[0042] In the above embodiment, the second threaded hole 742 is used to install the stationary ring 3 of the second mechanical seal 5. When removing the upper cover 711, the stationary ring 3 of the second mechanical seal 5 is first removed from the upper cover 711, and then the upper cover 711 can be removed.

[0043] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

[0044] The terms used in this document are selected to best explain the principles of the embodiments, practical applications or technical improvements in the marketplace, or to enable other ordinary technicians in this technical field to understand the embodiments disclosed herein.

[0045] The above are only optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A structure for extending the service life of a pump mechanical seal, comprising: A pump body (1), a first mechanical seal (2), wherein a stationary ring (3) of the first mechanical seal (2) is arranged on the pump body (1), and a dynamic ring (4) of the first mechanical seal (2) is arranged on a pump shaft (6), characterized in that: A second mechanical seal (5) is provided on a side of the first mechanical seal (2) close to the driving part of the pump body (1), and a dynamic ring (4) of the second mechanical seal (5) is provided on the pump shaft (6); The invention also comprises a sealing cavity (7) which is covered on the outside of the first mechanical seal (2); an end of the sealing cavity (7) away from the first mechanical seal (2) is rotatably connected to the pump shaft (6); a stationary ring (3) of the second mechanical seal (5) is arranged on the sealing cavity (7) and cooperates with a dynamic ring (4) of the second mechanical seal (5); and a lubricant is arranged in the sealing cavity (7).

2. The structure for extending the service life of a pump mechanical seal according to claim 1, characterized in that: The sealed cavity (7) comprises: A cylindrical housing (71) is provided between the impeller (8) and the driving part of the pump body (1); The two ends of the cylindrical shell (71) are respectively provided with a first through hole (72) and a second through hole (73); wherein The first through hole (72) is arranged close to the impeller (8), the first through hole (72) is used to install the first mechanical seal (2), and the second through hole (73) is used to install the second mechanical seal (5).

3. The structure for extending the service life of a pump mechanical seal according to claim 2, characterized in that: The cylindrical housing (71) comprises an upper cover (711) and a cylinder (712); wherein The upper cover (711) is bolted to the top of the cylinder (712); An annular protrusion (713) is provided on the inner wall of the lower end of the cylinder (712); The cylindrical housing (71) further comprises: a pressing plate (74) disposed in the cylinder (712) and pressed against the upper portion of the annular protrusion (713); A first screw rod (715) is threadedly connected to the pressing plate (74) and the annular protrusion (713).

4. The structure for extending the service life of a pump mechanical seal according to claim 3, characterized in that: A first sealing rubber ring (716) is provided between the upper cover (711) and the cylinder (712); An annular sealing groove (717) is provided on the circumferential outer wall of the pressing plate (74), and the annular sealing groove (717) is arranged concentrically with the pressing plate (74); A second sealing rubber ring (718) is provided in the annular sealing groove (717).

5. The structure for extending the service life of a pump mechanical seal according to claim 4, characterized in that: A grease injection hole (719) is provided on the outer wall of the bottom end of the cylinder (712), and one end of the grease injection hole (719) is connected to the inner wall of the cylinder (712); The surface of the upper cover (711) is provided with an air hole (714), and the bottom end of the air hole (714) is connected to the inner wall of the cylinder (712); wherein The grease injection hole (719) and one end of the air hole (714) are both sealed by a sealing bolt.

6. The structure for extending the service life of a pump mechanical seal according to claim 5, characterized in that: The pressing plate (74) comprises: A stepped cover body, wherein the circumferential outer wall of the small diameter end is connected to the inner wall of the annular protrusion (713), and the bottom surface of the large diameter end is arranged on the top surface of the annular protrusion (713); The first through hole (72) is provided on the surface of the stepped cover body and is arranged concentrically with the stepped cover body; A plurality of first threaded holes (741) are provided on the surface of the stepped cover body, and the stationary ring (3) of the first mechanical seal (2) is bolted to the first threaded holes (741); The movable ring (4) of the first mechanical seal (2) is arranged in the first through hole (72) and sleeved on the circumferential outer wall of the pump shaft (6) close to the first through hole (72).

7. The structure for extending the service life of a pump mechanical seal according to claim 6, characterized in that: The second through hole (73) is provided on the surface of the upper cover (711) and is arranged concentrically with the upper cover (711); A second threaded hole (742) is also provided on the surface of the upper cover (711), and the stationary ring (3) of the second mechanical seal (5) is bolted to the second threaded hole (742). The dynamic ring (4) of the second mechanical seal (5) is arranged in the second through hole (73) and sleeved on the circumferential outer wall of the pump shaft (6) close to the second through hole (73).

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