Double-end-face mechanical seal flushing structure for double-suction pump
Patent Information
- Application Number
- CN202521772316.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-20
- Publication Date
- 2026-09-22
- Estimated Expiration
- 2035-08-20
AI Technical Summary
[0003]本实用新型的目的是提供一种双吸泵用双端面机封冲洗结构，用以解决现有的在双吸泵双端面机封的传统冲洗结构中，冷却水从泵体的机封冷却进水口进入机械密封腔体后，因缺乏分流导向机制，大部分冷却水未流经双端面机封的内外侧动静环结合面，而是直接从机封压盖的出水口短路逃逸；这导致冷却水实际接触密封面的比例不足，尤其内侧高温区域形成严重冲洗盲区；持续的热累积引发密封环变形甚至开裂，同时为补偿冷却不足而提高水压的操作，进一步加剧了机封动静环的集中受力损坏风险，以及现有技术依赖单一高压水源强行提升冲洗效果，但高压水流单点冲击双端面机封的动静环结合面，导致局部应力超限使石墨环碎裂率提升；机械密封体与机封压盖连接处仅采用简易垫片密封，高压冲刷下冷却液与泵内介质互渗率高，不仅污染介质更稀释冷却液效率；频繁的机封更换与超高水压需求使能耗增加，维护成本激增的问题
通过分流环结构的引入，高压冷却水从机封冷却进水口进入机械密封体冷却水预留腔体后，被分流环分成多股流道均匀分布，确保冷却水充分接触并依次冲洗双端面机封的内外侧动静环结合面，从而彻底解决了现有技术中冲洗不到位、冷却水未充分冷却便直接流出的问题，同时，多股分流设计有效分散了冷却水压力，避免了单点冲洗集中受力导致的机封动静环损坏风险，这种结构不仅增大了冷却水的利用率，冷却水必须完全冲洗所有结合面后方可流出机封腔体，还降低了对外部冲洗水压的依赖，防止压力过高冲坏机封，同时通过O型密封圈的精准密封设计，有效隔离泵体内介质与冷却液，杜绝渗漏隐患；
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Figure CN224786026U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of mechanical seal flushing structure, and in particular to a double-end-face mechanical seal flushing structure for a double-suction pump. Background Technology
[0002] As a key piece of equipment for industrial fluid transportation, the reliability of the mechanical seal system of a double-suction pump directly affects the equipment's lifespan. Under high temperature and high pressure conditions, the mating surfaces of the dynamic and static rings of the mechanical seal generate a large amount of heat due to friction, requiring continuous external cooling water flushing for cooling. Traditional solutions employ a single-channel flushing structure, with cooling water injected from the pump body's inlet, flowing through the sealing cavity, and exiting from the outlet of the mechanical seal gland. However, with the increase in equipment power, the shortcomings of existing technologies have become apparent: Firstly, in the traditional flushing structure of a double-suction pump with a double-end-face mechanical seal, after the cooling water enters the mechanical seal cavity from the pump body's mechanical seal cooling inlet, due to the lack of a diversion and guiding mechanism, most of the cooling water does not flow through the inner and outer dynamic and static ring mating surfaces of the double-end-face mechanical seal, but instead escapes directly from the outlet of the mechanical seal gland. This results in insufficient actual contact between the cooling water and the sealing surface, especially in the high-temperature area on the inner side, forming a serious flushing blind zone. The continuous heat accumulation causes the sealing ring to deform or even crack. At the same time, the operation of increasing water pressure to compensate for insufficient cooling further exacerbates the risk of concentrated stress damage to the dynamic and static rings of the mechanical seal. Secondly, existing technologies rely on a single high-pressure water source to forcibly improve the flushing effect. However, the single-point impact of high-pressure water flow on the dynamic and static ring mating surfaces of the double-end mechanical seal causes local stress exceeding the limit, increasing the graphite ring breakage rate. The connection between the mechanical seal body and the mechanical seal gland is sealed only with a simple gasket. Under high-pressure flushing, the interpermeability between the coolant and the pump medium is high, which not only contaminates the medium but also dilutes the coolant efficiency. Frequent mechanical seal replacements and ultra-high water pressure requirements increase energy consumption and cause maintenance costs to soar. Therefore, it is necessary to design a double-end mechanical seal flushing structure for a double-suction pump. Utility Model Content
[0003] The purpose of this invention is to provide a flushing structure for a double-end-face mechanical seal of a double-suction pump. This addresses the problem in existing flushing structures for double-end-face mechanical seals of double-suction pumps where, after cooling water enters the mechanical seal cavity from the pump body's cooling inlet, due to the lack of a diversion and guiding mechanism, most of the cooling water fails to flow through the inner and outer dynamic and static ring mating surfaces of the double-end-face mechanical seal. Instead, it escapes directly from the outlet of the mechanical seal gland. This results in insufficient actual contact between the cooling water and the sealing surface, especially creating a severe flushing blind zone in the high-temperature inner area. Continuous heat accumulation leads to deformation and even cracking of the sealing ring. The operation of increasing water pressure to compensate for insufficient cooling further exacerbates the risk of concentrated stress damage to the dynamic and static rings of the mechanical seal. In addition, the existing technology relies on a single high-pressure water source to forcibly improve the flushing effect, but the high-pressure water flow impacts the dynamic and static ring mating surface of the double-end mechanical seal at a single point, causing local stress to exceed the limit and increasing the graphite ring breakage rate. The mechanical seal body and the mechanical seal gland are only sealed with a simple gasket. Under high pressure flushing, the interpermeability rate between the coolant and the medium in the pump is high, which not only contaminates the medium but also dilutes the coolant efficiency. Frequent mechanical seal replacement and ultra-high water pressure requirements increase energy consumption and cause maintenance costs to soar.
[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a double-end mechanical seal flushing structure for a double-suction pump, including a mechanical seal cover, a double-end mechanical seal, a mechanical seal body, a pump shaft, a pump cover, a pump body, and an O-ring seal. The mechanical seal cover is provided with a mechanical seal cooling water outlet, and its interior is provided with a reserved cavity for mechanical seal cover cooling water. The double-end mechanical seal is mounted on the pump shaft and located inside the mechanical seal body, and the mechanical seal body is provided with a reserved cavity for cooling water. The pump body is equipped with an mechanical seal cooling water inlet; It also includes a flow divider ring, which is disposed in the mechanical seal body and has flow divider holes for dividing the cooling water into multiple streams; The mechanical seal cooling water inlet, the mechanical seal body cooling water reserved cavity, the diversion hole of the diversion ring, and the mechanical seal cooling water outlet are connected in sequence to form a cooling water flow channel, so that the cooling water can sequentially flush the inner dynamic and static ring joint surface and the outer dynamic and static ring joint surface of the double-end mechanical seal. Cooling water enters the pre-reserved cooling water cavity of the mechanical seal body from the cooling water inlet of the mechanical seal. It is divided into multiple streams through the diversion hole of the diversion ring. These streams first uniformly flush the inner dynamic and static ring mating surfaces of the double-end mechanical seal, near the pump shaft side, and then flow to the outer dynamic and static ring mating surfaces, near the mechanical seal gland side, and finally exit through the cooling water outlet of the mechanical seal. This directional flow ensures that the cooling water fully contacts all sealing surfaces.
[0005] As a further technical solution of this utility model, the number of diversion holes on the diversion ring is sixteen, of which eight are diversion hole inlets and eight are diversion hole outlets. The diversion hole inlets are connected to the reserved cavity for cooling water of the mechanical seal body, and the diversion hole outlets are connected to the cooling water outlet of the mechanical seal body. The sixteen diversion holes achieve symmetrical diversion with eight inlets and eight outlets. The inlet holes receive cooling water from the reserved cavity for cooling water of the mechanical seal body, and the outlet holes guide the cooling water to the cooling water outlet of the mechanical seal body. This design ensures balanced flow and avoids local overheating.
[0006] As a further technical solution of this utility model, the outlet of the diversion hole of the diversion ring is connected to the reserved cavity for cooling water of the mechanical seal cover, and the cooling water outlet of the mechanical seal is connected to the reserved cavity for cooling water of the mechanical seal cover; the reserved cavity for cooling water of the mechanical seal cover serves as a buffer container, collecting the cooling water flowing out from the outlet of the diversion hole, and then discharging it through the cooling water outlet of the mechanical seal. This cavity extends the residence time of the cooling water and enhances the heat exchange effect.
[0007] As a further technical solution of this utility model, the connection between the mechanical seal body and the mechanical seal cover is provided with an O-ring reserved position. The O-ring is set in the reserved position to prevent leakage of medium and coolant in the pump body. The O-ring provides double sealing under high pressure environment. The reserved position ensures accurate installation of the O-ring and avoids sealing failure due to assembly errors. This design improves system reliability and reduces maintenance frequency.
[0008] As a further technical solution of this utility model, the outlet of the diversion hole of the diversion ring is opposite to the axial projection of the mechanical seal cooling water outlet of the mechanical seal cover; the outlet is axially aligned with the mechanical seal cooling water outlet, eliminating the flow channel turning resistance, which reduces turbulence and pressure drop, and ensures smooth discharge of cooling water.
[0009] As a further technical solution of this utility model, the side of the diversion ring with the diversion hole inlet is located inside the mechanical seal body, and its position is adapted to the double-end mechanical seal to ensure that the cooling water preferentially flushes the inner dynamic and static ring joint surface; the inlet side of the diversion ring (12) is close to the inner side of the double-end mechanical seal, and the cooling water first impacts the inner joint surface and then diffuses to the outside to achieve gradient cooling.
[0010] The present invention provides a double-end mechanical seal flushing structure for a double-suction pump, the advantages of which are: By introducing a diversion ring structure, high-pressure cooling water enters the pre-reserved cooling water cavity of the mechanical seal body from the mechanical seal cooling inlet. It is then divided into multiple evenly distributed channels by the diversion ring, ensuring that the cooling water fully contacts and sequentially flushes the inner and outer dynamic and static ring mating surfaces of the double-end mechanical seal. This completely solves the problems of inadequate flushing and insufficient cooling water flowing out directly in the existing technology. At the same time, the multi-channel diversion design effectively disperses the cooling water pressure, avoiding the risk of damage to the dynamic and static rings of the mechanical seal caused by concentrated force from single-point flushing. This structure not only increases the utilization rate of cooling water, as the cooling water must completely flush all mating surfaces before flowing out of the mechanical seal cavity, but also reduces the dependence on external flushing water pressure, preventing excessive pressure from damaging the mechanical seal. In addition, the precise sealing design of the O-ring seal effectively isolates the pump body medium from the coolant, eliminating the risk of leakage. In terms of specific implementation, the sixteen diversion holes of the diversion ring optimize the flow channel dynamics. After the cooling water flows in through the inlet, it preferentially flushes the inner dynamic and static ring mating surface with a higher temperature, and then diffuses to the outside to achieve gradient cooling. This design forces the cooling water to follow a directional path, eliminating flushing blind spots. Combined with the buffering effect of the reserved cavity for cooling water in the mechanical seal cover, the residence time of the cooling water is further extended to enhance the heat exchange efficiency. The overall structure reduces energy loss while improving system stability, making it suitable for high-pressure environments, significantly extending the mechanical seal life and reducing maintenance frequency. Attached Figure Description
[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the shunt ring structure used in this utility model; Figure 3 This is a schematic diagram of an existing dual-end mechanical seal cooling structure.
[0013] In the diagram: 1. Mechanical seal gland; 2. Double-end mechanical seal; 3. Mechanical seal body; 4. Pump shaft; 5. Pump cover; 6. Pump body; 7. O-ring seal; 8. Mechanical seal cooling water inlet; 9. Mechanical seal cooling water outlet; 10. Cooling water reserved cavity for mechanical seal body; 11. Cooling water reserved cavity for mechanical seal gland; 12. Diverter ring. Detailed Implementation
[0014] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0015] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0016] Please see the appendix Figure 1 - Appendix Figure 3 The present invention provides an embodiment of a double-suction pump with a double-end mechanical seal flushing structure, including a mechanical seal cover 1, a double-end mechanical seal 2, a mechanical seal body 3, a pump shaft 4, a pump cover 5, a pump body 6, and an O-ring seal 7. The mechanical seal cover 1 is provided with a mechanical seal cooling water outlet 9, and its interior is provided with a mechanical seal cover cooling water reserved cavity 11. The double-end mechanical seal 2 is mounted on the pump shaft 4 and is located inside the mechanical seal body 3. The mechanical seal body 3 is provided with a mechanical seal body cooling water reserved cavity 10. The pump body 6 is equipped with an mechanical seal cooling water inlet 8; It also includes a flow divider ring 12, which is set inside the mechanical seal body 3. It has flow divider holes to divide the cooling water into multiple streams. The number of flow divider holes on the flow divider ring 12 is sixteen, of which eight are flow divider hole inlets and eight are flow divider hole outlets. The flow divider hole inlets are connected to the cooling water reserved cavity 10 of the mechanical seal body. The side of the flow divider ring 12 with the flow divider hole inlet is located inside the mechanical seal body 3, and its position is adapted to the double-end mechanical seal 2 to ensure that the cooling water preferentially flushes the inner dynamic and static ring mating surface. The inlet side of the flow divider ring (12) is close to the inner side of the double-end mechanical seal 2. The cooling water first impacts the inner mating surface and then diffuses to the outside to achieve gradient cooling. The flow divider hole outlet is connected to the mechanical seal cooling water outlet 9. The flow divider hole outlet of the flow divider ring 12 is connected to the mechanical seal cooling water outlet of the mechanical seal cover 1. The axial projections of the 9 outlets are aligned with the mechanical seal cooling water outlet 9, eliminating flow channel turning resistance. This reduces turbulence and pressure drop, ensuring smooth discharge of cooling water. The sixteen diversion holes provide symmetrical flow distribution with eight inlets and eight outlets. The inlet holes receive cooling water from the mechanical seal cooling water reserved cavity 10, and the outlet holes guide the cooling water to the mechanical seal cooling water outlet 9. This design ensures balanced flow and avoids local overheating. The outlet of the diversion hole of the diversion ring 12 is connected to the mechanical seal gland cooling water reserved cavity 11, and the mechanical seal cooling water outlet 9 is connected to the mechanical seal gland cooling water reserved cavity 11. The mechanical seal gland cooling water reserved cavity 11 acts as a buffer container, collecting the cooling water flowing out from the diversion hole outlet and then discharging it through the mechanical seal cooling water outlet 9. This cavity extends the residence time of the cooling water and enhances the heat exchange effect. The connection between the mechanical seal body 3 and the mechanical seal gland 1 is provided with a reserved position for an O-ring 7. The O-ring 7 is set in this reserved position to prevent leakage of medium and coolant inside the pump body 6. The O-ring 7 provides a double seal under high pressure. The reserved position ensures that the O-ring 7 is installed accurately, avoiding seal failure due to assembly errors. This design improves system reliability and reduces maintenance frequency. The mechanical seal cooling water inlet 8, the mechanical seal body cooling water reserved cavity 10, the diversion hole of the diversion ring 12, and the mechanical seal cooling water outlet 9 are connected in sequence to form a cooling water flow channel, so that the cooling water sequentially flushes the inner dynamic and static ring joint surface and the outer dynamic and static ring joint surface of the double-end mechanical seal 2.
[0017] Specifically, during use, cooling water enters the mechanical seal cooling water reserved cavity 10 from the mechanical seal cooling water inlet 8. It is divided into multiple streams through the diversion hole of the diversion ring 12. These streams first uniformly flush the inner dynamic and static ring mating surfaces of the double-end mechanical seal 2, near the pump shaft 4, and then flow to the outer dynamic and static ring mating surfaces, near the mechanical seal gland 1, and finally discharge through the mechanical seal cooling water outlet 9. This directional flow ensures that the cooling water fully contacts all sealing surfaces.
[0018] In summary, by introducing the diversion ring 12 structure, the high-pressure cooling water enters the mechanical seal cooling water reserved cavity 10 from the mechanical seal cooling water inlet 8 and is divided into multiple evenly distributed channels by the diversion ring 12. This ensures that the cooling water fully contacts and sequentially flushes the inner and outer dynamic and static ring mating surfaces of the double-end mechanical seal 2, thereby completely solving the problems of inadequate flushing and insufficient cooling water flowing out directly in the prior art. At the same time, the multi-channel diversion design effectively disperses the cooling water pressure, avoiding the risk of damage to the dynamic and static rings of the mechanical seal caused by concentrated force during single-point flushing. This structure not only increases the utilization rate of cooling water, but also reduces the dependence on external flushing water pressure, preventing excessive pressure from damaging the mechanical seal. In addition, the precise sealing design of the O-ring 7 effectively isolates the medium inside the pump body 6 from the coolant, eliminating the risk of leakage. In terms of specific implementation, the sixteen diversion holes of the diversion ring 12 optimize the flow channel dynamics. After the cooling water flows in through the inlet, it preferentially flushes the inner dynamic and static ring joint surface with a higher temperature, and then diffuses to the outside to achieve gradient cooling. This design forces the cooling water to follow a directional path, eliminating the flushing blind zone. Combined with the buffering effect of the cooling water reserved cavity 11 of the mechanical seal cover, the residence time of the cooling water is further extended to enhance the heat exchange efficiency. The overall structure reduces energy loss while improving system stability, is suitable for high-pressure environments, significantly extends the mechanical seal life and reduces maintenance frequency.
[0019] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.
[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A double-end mechanical seal flushing structure for a double-suction pump, comprising a mechanical seal gland (1), a double-end mechanical seal (2), a mechanical seal body (3), a pump shaft (4), a pump cover (5), a pump body (6), and an O-ring seal (7), characterized in that: The mechanical seal cover (1) is provided with a mechanical seal cooling water outlet (9), and a mechanical seal cover cooling water reserved cavity (11) is provided inside it. The double-end mechanical seal (2) is fitted on the pump shaft (4) and located inside the mechanical seal body (3). The mechanical seal body (3) is provided with a mechanical seal body cooling water reserved cavity (10). The pump body (6) is provided with an mechanical seal cooling water inlet (8); It also includes a flow divider ring (12), which is disposed inside the mechanical seal body (3) and has flow divider holes for dividing the cooling water into multiple streams; The mechanical seal cooling water inlet (8), the mechanical seal cooling water reserved cavity (10), the diversion hole of the diversion ring (12), and the mechanical seal cooling water outlet (9) are connected in sequence to form a cooling water flow channel, so that the cooling water can sequentially flush the inner dynamic and static ring joint surface and the outer dynamic and static ring joint surface of the double-end mechanical seal (2).
2. The double-end mechanical seal flushing structure for a double-suction pump according to claim 1, characterized in that: The number of flow-dividing holes on the flow-dividing ring (12) is sixteen, of which eight are flow-dividing hole inlets and eight are flow-dividing hole outlets. The flow-dividing hole inlets are connected to the mechanical seal cooling water reserved cavity (10), and the flow-dividing hole outlets are connected to the mechanical seal cooling water outlet (9).
3. The double-end mechanical seal flushing structure for a double-suction pump according to claim 1, characterized in that: The outlet of the diversion hole of the diversion ring (12) is connected to the reserved cavity (11) for cooling water of the mechanical seal cover, and the cooling water outlet (9) of the mechanical seal is connected to the reserved cavity (11) for cooling water of the mechanical seal cover.
4. The double-end mechanical seal flushing structure for a double-suction pump according to claim 1, characterized in that: The mechanical seal body (3) and the mechanical seal cover (1) are provided with a reserved position for an O-ring (7), and the O-ring (7) is set in the reserved position.
5. The double-end mechanical seal flushing structure for a double-suction pump according to claim 1, characterized in that: The outlet of the diversion hole of the diversion ring (12) is axially projected relative to the mechanical seal cooling outlet (9) of the mechanical seal cover (1).
6. The double-end mechanical seal flushing structure for a double-suction pump according to claim 1, characterized in that: The side of the diversion ring (12) with the diversion hole inlet is located inside the mechanical seal body (3), and its position is adapted to the double-end mechanical seal (2) to ensure that the cooling water preferentially flushes the inner dynamic and static ring mating surface.