Series-parallel connection double-end-face mechanical sealing device of condensate pump
By using a series-parallel double-end mechanical seal structure and optimizing the sealing cooling water circulation, the problem of condensate pump sealing water leakage was solved, improving sealing performance and water resource utilization, and enhancing the safety and economy of the unit.
Patent Information
- Application Number
- CN202520589120.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-03-31
AI Technical Summary
Existing condensate pump mechanical seals suffer from leakage of sealing water and are prone to air leakage, which affects condenser vacuum and leads to a decrease in unit safety and economy.
It adopts a series-parallel double-end mechanical seal structure, which prevents air from entering the pump through two sealing components, and optimizes the sealing cooling water circulation design to achieve the recycling of sealing water.
It significantly improves sealing performance, prevents air from leaking into the pump, saves water resources, improves the safety and economy of the unit, and is easy to install and maintain.
Smart Images
Figure CN223894501U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of condensate pump, concretely relates to a condensate pump series-parallel connection double-end face mechanical sealing device. BACKGROUND
[0002] Condensate pump is important auxiliary equipment of thermal power plant, is under the condition of air degree vacuum condensate suction into the pump after heating by step pressurization, injects deaerator, realizes the circulation utilization of working medium, and its safety decides the safety of entire power plant, and the pump is high vacuum and the atmospheric pressure of pump exists big pressure difference, air is extremely easy to leak into the pump, adopts the shaft end sealing device to prevent its leakage, and the shaft seal often adopts mechanical seal or packing seal, and packing seal is eliminated basically due to big frictional resistance, high power consumption, quick wear, and often pump replacement, causes hidden danger to the safe operation of pump, and mechanical sealing belongs to precision, and the structure is relatively complex mechanical basic element, is to prevent fluid leakage by at least one pair of end faces perpendicular to the rotation axis under the action of fluid pressure and compensation mechanism elasticity and the cooperation of auxiliary seal, keeps dynamic ring sealing surface and relatively slides and constitutes the device. SUMMARY
[0003] The utility model provides a kind of condensate pump series-parallel connection double-end face mechanical sealing device, has solved the technical problem that existing technology exists condensate pump mechanical sealing sealing water leakage, easy to leak air, affect condenser vacuum, cause the influence to the safe, economic operation of unit.
[0004] To achieve the above purpose, the utility model adopts the following technical scheme,
[0005] The application discloses a condensate pump series-parallel double-end-face mechanical sealing device, which comprises a pump shaft, a shaft sleeve is sleeved on the pump shaft, the shaft sleeve and the pump shaft are fixedly sealed through a shaft sleeve O-shaped ring, a lower dynamic ring seat and a lower static ring seat are fixed on the shaft sleeve, a lower dynamic ring is arranged on the lower dynamic ring seat, a lower static ring is arranged on the lower static ring seat, the lower dynamic ring is tightly combined with the lower static ring to form a series structure, an upper static ring seat and an upper dynamic ring seat are further arranged on the shaft sleeve, an upper static ring is arranged on the upper static ring seat, an upper dynamic ring is arranged on the upper dynamic ring seat, the upper dynamic ring is tightly combined with the upper static ring to form a series structure, positioning pins and spring structures are arranged on the upper ends of the lower static ring seat and the upper static ring seat, a lower gland is arranged outside the lower dynamic ring seat and the lower static ring seat, an intermediate body is arranged on the upper ends of the upper static ring seat and the upper dynamic ring seat, an upper gland is arranged on the upper end of the intermediate body, a sealing cavity is formed between the lower gland, the intermediate body, the upper gland and the shaft sleeve, a water inlet channel and a backwater channel are connected with the sealing cavity, and the water inlet channel and the backwater channel form a loop.
[0006] The lower dynamic ring seat is connected with the shaft sleeve through a lower dynamic ring key and is further fixed on the shaft sleeve 2 through a lower dynamic ring fixing screw, and the lower dynamic ring seat is further sealed between the shaft sleeve through a dynamic ring O-shaped sealing ring.
[0007] The inner side of the lower static ring seat is provided with a lower static ring inner O-shaped ring, the outer side of the lower static ring seat is provided with a lower static ring outer O-shaped ring, the lower static ring seat is sealingly connected with the lower gland through the lower static ring inner O-shaped ring, and the outer side of the lower static ring seat is sealingly connected with the lower gland through the lower static ring outer O-shaped ring.
[0008] The upper ends of the lower static ring seat and the upper static ring seat are provided with positioning pins and spring structures, specifically, a lower static ring positioning pin and a lower static ring spring are arranged on the upper end of the lower static ring seat, and an upper static ring positioning pin and an upper static ring spring are arranged on the upper end of the upper static ring seat.
[0009] The inner side of the upper static ring seat is provided with an upper static ring inner O-shaped ring, the outer side of the upper static ring seat is provided with an upper static ring outer O-shaped ring, and the upper static ring seat is sealingly connected with the intermediate body through the upper static ring inner O-shaped ring and the upper static ring outer O-shaped ring.
[0010] The inner side of the upper dynamic ring seat is provided with an upper dynamic ring O-shaped ring, and the upper dynamic ring seat is sealingly connected with the shaft sleeve through the upper dynamic ring O-shaped ring.
[0011] The lower gland is provided with a lower gland O-shaped ring, the intermediate body is provided with an intermediate body O-shaped ring, and the upper gland is provided with an upper gland O-shaped sealing ring; the lower gland, the intermediate body and the upper gland form a sealing cavity between the lower gland O-shaped ring, the intermediate body O-shaped ring and the upper gland O-shaped sealing ring and the shaft sleeve.
[0012] The lower gland, the intermediate body and the upper gland are provided with gland connecting bolts, and the lower gland, the intermediate body and the upper gland are fixed on the shaft sleeve through the gland connecting bolts.
[0013] The upper end of the upper gland cover is provided with a positioning plate, and the positioning plate is fixed on the upper gland cover through fixing bolts.
[0014] The upper end of the shaft sleeve is provided with a locking sleeve, and the locking sleeve is externally provided with a compression ring A and a compression ring B, which are locked and fixed through compression ring bolts.
[0015] Compared with the prior art, the utility model has the beneficial effects that:
[0016] The utility model discloses a condensate pump series-parallel double end face mechanical sealing device adopts double end face mechanical sealing structure of upper and lower dynamic and static ring series connection, and the air outside the pump body needs to pass two sealing assemblies to enter the pump, which remarkably improves sealing performance, effectively prevents air from leaking into the pump and avoids affecting the vacuum of the condenser. The sealing cooling water is recycled through reasonable design, and the lower sealing cooling water returns to the pump, and the upper sealing cooling water returns to the recovery water tank or the positive pressure system through the pressure stabilizing valve, which realizes sealing water recycling, saves water resources and reduces the problem of on-site safe and civilized production. The whole is a container type structure, and does not need on-site adjustment. When installing, the whole is sleeved on the pump shaft, and the positioning plate is fastened after positioning, and the positioning plate is removed or rotated after fastening, so that the operation is simple, and the assembly and disassembly are convenient. The O-shaped ring between the static ring and the gland is sealed, the spring is separated from the sealing cooling water, dry operation is realized, the spring is prevented from being corroded and scaled by contacting water, the spring is prevented from being jammed, and the reliability of the sealing system is improved. The static ring sealing surface is provided with a circular groove, solid particles or debris can be accumulated, the dynamic and static rings are further prevented from being abraded, and the sealing performance is improved. In conclusion, the condensate pump series-parallel double end face mechanical sealing device optimizes the sealing structure, improves the reliability of the sealing, realizes sealing water recycling, has the advantages of convenient installation and simple maintenance, effectively solves the problems in the prior art and improves the safety and economy of the unit. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 Figure 1 is a side view of the condensate pump series-parallel double end face mechanical sealing device.
[0018] Figure 2 Figure 2 is a top view of the condensate pump series-parallel double end face mechanical sealing device.
[0019] Explanation of reference numerals: 1, pump shaft; 2, shaft sleeve; 3, lower movable ring key; 4, lower movable ring O-ring; 5, lower movable ring seat; 6, lower movable ring; 7, lower gland O-ring; 8, shaft sleeve O-ring; 9, lower static ring; 10, lower static ring inner O-ring; 11, lower static ring outer O-ring; 12, lower static ring positioning pin; 13, intermediate body O-ring; 14, upper movable ring O-ring; 15, upper movable ring; 16, upper static ring; 17, upper static ring seat; 18, upper static ring inner O-ring; 19, upper static ring outer O-ring; 20, upper static ring positioning pin; 21, mechanical seal fastening bolt; 22, lower movable ring fixing screw; 23, lower mechanical seal cooling water inlet; 24, lower static ring spring; 25, lower gland; 26, upper movable ring seat fixing screw; 27, upper movable ring seat and shaft sleeve connecting key; 28, intermediate body; 29, upper static ring spring; 30, upper gland; 31, locking sleeve; 32, compression ring A; 33, compression ring B; 34, compression ring bolt; 35, lower sealing cooling water return pipe; 36, lower static ring seat; 37, upper sealing cooling water return pipe; 38, drain groove valve; 39, pressure stabilizing valve; 40, lower sealing cooling water inlet throttling hole; 41, lower static ring spring emptying port; 42, upper static ring spring emptying port; 43, upper movable ring seat; 44, gland connecting bolt; 45, positioning plate; 46, positioning plate fixing bolt; 47, condensate pump outlet high-pressure water inlet throttling hole; 48, upper gland O-ring. DETAILED DESCRIPTION
[0020] In order to further understand the content of the present application, the present application will be described in detail below in combination with the drawings and specific embodiments. It should be understood that the embodiments are only used to explain the present application and are not limited.
[0021] Reference should be made to Figure 1 and Figure 2The embodiment provides a condensate pump series-parallel double-end-face mechanical sealing device, which mainly comprises a shaft sleeve 2, the shaft sleeve 2 is sleeved on a pump shaft 1, and the pump shaft 1 is sealed and fixed with the shaft sleeve 2 through a shaft sleeve O-shaped ring 8; air outside the pump is prevented from leaking into the pump through the gap between the pump shaft 1 and the shaft sleeve 2, so that the stability of the vacuum environment in the pump is ensured. A lower dynamic ring seat 5 is connected with the shaft sleeve 2 through a lower dynamic ring key 3 and is further fixed on the shaft sleeve 2 through a lower dynamic ring fixing screw 22, so that the reliability of the connection is ensured, and meanwhile, the lower dynamic ring seat 5 is sealed between the shaft sleeve 2 through a lower dynamic ring O-shaped sealing ring. The lower dynamic ring seat 5 is made of metal, a lower gland 25 is arranged on the outer side of the lower dynamic ring seat 5, the lower gland 25 is sealed and connected with the lower dynamic ring seat 5 through a lower gland O-shaped ring 7, and an upper gland 30 is further arranged on the upper end of the shaft sleeve 2. An intermediate body 28 is arranged between the upper gland 30 and the lower gland 25, and the upper gland 30, the intermediate body 28 and the lower gland 25 are connected and fixed through a gland connecting bolt 44, so that the mechanical sealing combination is integrated, and the mechanical sealing combination is convenient and simple to install. The upper end of the upper gland 30 is provided with a positioning plate 45, and the positioning plate 45 is fixed on the positioning plate 45 through a positioning plate fixing bolt 46. The lower dynamic ring seat 5 is provided with a lower dynamic ring 6, the lower dynamic ring 6 is embedded and fixed on the lower dynamic ring seat 5, the lower dynamic ring seat 5 is in interference fit with the lower dynamic ring 6, the lower dynamic ring seat 5 provides necessary support and fixing action for the lower dynamic ring 6, good transmission connection can be realized, torque can be effectively transmitted, and the lower dynamic ring 6 can stably rotate with the shaft sleeve 2 and the pump shaft 1. The lower dynamic ring 6 and a lower static ring 9 are closely attached to form a series connection structure, the lower dynamic ring 6 and the lower static ring 9 slide relative to each other, the lower static ring 9 is arranged on a lower static ring seat 36, the inner side of the lower static ring seat 36 is sealed and connected with the lower gland 25 through a lower static ring inner O-shaped ring 10, and the outer side of the lower static ring seat 36 is sealed and connected with the lower gland 25 through a lower static ring outer O-shaped ring 11. An upper dynamic ring seat 43 and an upper static ring seat 17 are further arranged on the shaft sleeve 2, the upper dynamic ring seat 43 is fixed through an upper dynamic ring seat fixing screw 26, the upper dynamic ring seat 43 is connected with the shaft sleeve 2 through an upper dynamic ring seat and shaft sleeve connecting key 27, an upper dynamic ring 15 is arranged on the upper dynamic ring seat 43, and the upper dynamic ring seat 43 is sealed and connected with the shaft sleeve 2 through an upper dynamic ring O-shaped ring 14; an upper static ring 16 is arranged on the upper static ring seat 17, the inner side of the upper static ring seat 17 is sealed and connected with the upper gland 30 through an upper static ring inner O-shaped ring 18, and the outer side of the upper static ring seat 17 is sealed and connected with the intermediate body 28 through an upper static ring outer O-shaped ring 19; the upper dynamic ring 15 and the upper static ring 16 are closely attached to form a series connection structure, and the upper dynamic ring 15 and the upper static ring 16 slide relative to each other; the series-connected upper dynamic ring 15 and the upper static ring 16 and the series-connected lower dynamic ring 6 and the lower static ring 9 form a parallel connection structure. The lower dynamic ring O-shaped ring 4 and the upper dynamic ring O-shaped ring 14 seal the lower dynamic ring seat 5 and the upper dynamic ring seat 43 with the shaft sleeve 2, and prevent water from leaking out from the inner side of the dynamic ring.
[0022] The intermediate 28 is sealed and connected with the lower cover 25 through the intermediate O-ring 13. The lower static ring positioning pin 12 and the lower static ring spring 24 are arranged on the lower static ring seat 36. The lower static ring spring 24 provides the lower static ring 9 with an elastic force downward, so as to ensure that the lower static ring 9 is tightly attached to the lower dynamic ring 6, thereby forming an effective sealing surface. The lower static ring positioning pin 12 guides the lower static ring 9 to axially displace under the action of the lower static ring spring 24, and at the same time, limits the radial movement of the lower static ring 9, so as to ensure that the lower static ring 9 can accurately remain at the designed position during the operation of the mechanical seal, absorbs the axial movement of the pump rotor, and maintains the tight attachment of the sealing surface. The upper static ring positioning pin 20 and the upper static ring spring 29 are arranged on the upper static ring seat 17. The upper static ring spring 29 provides the upper static ring 16 with an elastic force downward, so as to ensure that the upper static ring 16 is tightly attached to the upper dynamic ring 15, thereby forming an effective sealing surface. The upper static ring positioning pin 20 guides the upper static ring 16 to axially displace under the action of the upper static ring spring 29, and at the same time, limits the radial movement of the upper static ring 16, so as to ensure that the upper static ring 16 can accurately remain at the designed position during the operation of the mechanical seal, absorbs the axial movement of the pump rotor, and maintains the tight attachment of the sealing surface. The lower static ring inner O-ring 10 and the lower static ring outer O-ring 11 seal the lower static ring seat 36 and the lower cover 25. The upper static ring inner O-ring 18 and the upper static ring outer O-ring 19 form a seal between the upper static ring seat 17, the upper cover 30 and the intermediate 28, so that the lower static ring spring 24 and the upper static ring spring 29 are isolated from the cooling water, and the lower static ring spring 24 and the upper static ring spring 29 operate in a dry manner, thereby avoiding the corrosion caused by the contact between the lower static ring spring 24 and the upper static ring spring 29 and water. The lower static ring spring 24 and the upper static ring spring 29 can be filled with lubricating grease in the spring or spring chamber during use, so as to lubricate the lower static ring spring 24 and the upper static ring spring 29, thereby improving the flexibility of the lower static ring spring 24 and the upper static ring spring 29. The back of the lower static ring spring 24 is provided with a lower static ring spring exhaust port 41, and the back of the upper static ring spring 29 is provided with an upper static ring spring exhaust port 42. The exhaust holes of the lower static ring spring exhaust port 41 and the upper static ring spring exhaust port 42 are connected to the atmosphere, so as to prevent the back of the upper static ring 16 and the lower static ring 9 on the pump shaft from generating pressure, thereby improving the movement reliability of the upper dynamic ring 15 and the lower dynamic ring 6. A circular groove is arranged in the sealing surface of the upper static ring 16 and the lower static ring 9. Solid particles in the medium or debris generated by the wear of the dynamic and static rings of the mechanical seal enter the sealing surface under the action of liquid pressure. After the sealing surface is closed, the solid particles are embedded on the surface of the soft ring (usually the right ink ring), thereby damaging the sealing surface. The circular groove arranged in the static ring sealing surface can accumulate the solid particles or debris in the circular groove space, thereby avoiding the further wear of the dynamic ring and the static ring, and improving the sealing performance of the mechanical seal.
[0023] The lower gland 25 is provided with a lower gland O-ring 7, the intermediate body 28 is provided with an intermediate body O-ring 13, and the upper gland 30 is provided with an upper gland O-ring 48; the lower gland 25, the intermediate body 28 and the upper gland 30 form a sealed cavity between the lower gland O-ring 7, the intermediate body O-ring 13 and the upper gland O-ring 48 and the shaft sleeve 2. One side of the sealed cavity is connected with a water inlet channel, and the other side of the sealed cavity is connected with a backwater channel; the water inlet channel and the backwater channel form a loop; the water inlet channel is connected with desalted water and condensate pump outlet water, and the backwater channel is connected with a backwater pump body, a drain and a positive pressure system; the sealed cavity in the lower gland 25 is communicated with the desalted water and the condensate pump outlet water through the lower machine seal cooling water inlet 23, and the desalted water and the condensate pump outlet water are also communicated with the sealed cavity in the intermediate body 28. The backwater pump body is communicated with the sealed cavity in the lower gland 25 through the lower sealing cooling water backwater pipe 35, and the drain and the positive pressure system are communicated with the sealed cavity in the intermediate body 28 through the upper sealing cooling water backwater pipe 37. The upper sealing cooling water backwater pipe 37 is connected with the drain and the positive pressure system, the positive pressure system is a backwater tank, a drain valve 38 is arranged on the communication pipeline of the upper sealing cooling water backwater pipe 37 and the drain, and a pressure stabilizing valve 39 is arranged on the communication pipeline of the upper sealing cooling water backwater pipe 37 and the positive pressure system; normal pressure backwater is connected with the positive pressure system through the pressure stabilizing valve 39, the drain is opened to backwater when the pressure stabilizing valve 39 fails, and the pressure stabilizing valve 39 is repaired. A lower sealing cooling water inlet throttling hole 40 is arranged on the communication pipeline of the lower gland 25 and the desalted water and the condensate pump outlet water, and a condensate pump outlet high-pressure water inlet throttling hole 47 is arranged on the water inlet pipeline of the condensate pump outlet water; the lower sealing cooling water inlet throttling hole 40 throttles the cooling water entering the pump body seal, ensures that the water inlet system before the lower sealing cooling water inlet throttling hole 40 maintains a positive pressure state, and prevents air from entering the mechanical seal. The lower sealing cooling water backwater pipe 35 is communicated with the water pump, the lower sealing cooling water backwater pipe 35 returns the lower sealing cooling water to the pump, cools the heat generated by the friction between the dynamic ring and the static ring of the mechanical seal, and realizes the circulation of the sealing cooling water.
[0024] The uppermost end of the shaft sleeve 2 is further sleeved with a locking sleeve 31, the locking sleeve 31 is sleeved with a compression ring A 32 and a compression ring B 33, and the compression ring A 32 and the compression ring B 33 are locked and fixed through a compression ring bolt 34. After the compression ring bolt 34 is fastened, the compression ring A 32 and the compression ring B 33 are fixed on the shaft sleeve 2 by the wedge surface. After the installation of the above-mentioned structure components is completed, the pump shaft 1 is positioned, the above-mentioned connection and disconnection sealing structure is integrally sleeved on the pump shaft 1 through the shaft sleeve 2, the mechanical seal fastening bolt 21 is used to fasten the overall structure, the positioning plate 45 is rotated outward by 180°, and then the positioning plate fixing bolt 46 is used to fasten the positioning plate 45, so that the installation of the condensate pump series-parallel double-end-face connection and disconnection sealing device is completed.
[0025] The above examples are only used to illustrate the technical solutions of the present application and not to limit them, and although the present application has been described in detail with reference to the above examples, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered within the protection scope of the claims of the present application.
Claims
1. A series-parallel double-end-face mechanical seal device for condensate pumps, characterized in that, The pump shaft (1) is fitted with a bushing (2), and the bushing (2) and the pump shaft (1) are fixedly sealed by a bushing O-ring (8). A lower moving ring seat (5) and a lower stationary ring seat (36) are fixed on the bushing (2). A lower moving ring (6) is provided on the lower moving ring seat (5), and a lower stationary ring (9) is provided on the lower stationary ring seat (36). The lower moving ring (6) and the lower stationary ring (9) are tightly fitted to form a series structure. An upper stationary ring seat (17) and an upper moving ring seat (43) are also provided on the bushing (2). An upper stationary ring (16) is provided on the upper stationary ring seat (17), and an upper moving ring (15) is provided on the upper moving ring seat (43). (15) and the upper stationary ring (16) are closely fitted to form a series structure; the upper ends of the lower stationary ring seat (36) and the upper stationary ring seat (17) are provided with positioning pins and spring structures; the lower moving ring seat (5) and the lower stationary ring seat (36) are provided with lower pressure caps (25), the upper ends of the upper stationary ring seat (17) and the upper moving ring seat (43) are provided with intermediate bodies (28), the upper ends of the intermediate bodies (28) are provided with upper pressure caps (30), the lower pressure caps (25), the intermediate bodies (28) and the upper pressure caps (30) form a sealed cavity with the bushing (2), the sealed cavity is connected to the water inlet channel and the water return channel respectively, and the water inlet channel and the water return channel form a loop.
2. The condensate pump series-parallel double-end-face mechanical seal device according to claim 1, characterized in that, The lower moving ring seat (5) is connected to the bushing (2) via the lower moving ring key (3) and is further fixed to the bushing (2) via the lower moving ring fixing screw (22). The lower moving ring seat (5) is also sealed to the bushing (2) via the moving ring O-ring seal (4).
3. The condensate pump series-parallel double-end-face mechanical seal device according to claim 1, characterized in that, The lower stationary ring seat (36) is provided with an inner O-ring (10) on the inner side and an outer O-ring (11) on the outer side. The lower stationary ring seat (36) is sealed to the lower pressure cover (25) through the inner O-ring (10) and the outer side of the lower stationary ring seat (36) is sealed to the lower pressure cover (25) through the outer O-ring (11).
4. A condensate pump series-parallel double-end-face mechanical seal device according to claim 1, characterized in that, The upper ends of the lower stationary ring seat (36) and the upper stationary ring seat (17) are provided with positioning pins and spring structures, specifically: a lower stationary ring positioning pin (12) and a lower stationary ring spring (24) are provided at the upper end of the lower stationary ring seat (36), and an upper stationary ring positioning pin (20) and an upper stationary ring spring (29) are provided at the upper end of the upper stationary ring seat (17).
5. A condensate pump series-parallel double-end-face mechanical seal device according to claim 4, characterized in that, The upper stationary ring seat (17) is provided with an inner O-ring (18) on the inner side and an outer O-ring (19) on the outer side. The upper stationary ring seat (17) is sealed to the intermediate body 28 through the inner O-ring (18) and the outer O-ring (19).
6. A condensate pump series-parallel double-end-face mechanical seal device according to claim 1, characterized in that, The upper moving ring seat (43) is provided with an upper moving ring O-ring (14) on its inner side, and the upper moving ring seat (43) is sealed to the bushing (2) through the upper moving ring O-ring (14).
7. A condensate pump series-parallel double-end-face mechanical seal device according to claim 1, characterized in that, The lower pressure cover (25) is provided with a lower pressure cover O-ring (7), the intermediate body (28) is provided with an intermediate body O-ring (13), and the upper pressure cover (30) is provided with an upper pressure cover O-ring (48); the lower pressure cover (25), the intermediate body (28) and the upper pressure cover (30) form a sealed cavity with the bushing (2) through the lower pressure cover O-ring (7), the intermediate body O-ring (13) and the upper pressure cover O-ring (48).
8. A condensate pump series-parallel double-end-face mechanical seal device according to claim 7, characterized in that, The lower cover (25), the intermediate body (28) and the upper cover (30) are provided with cover connecting bolts (44), and the lower cover (25), the intermediate body (28) and the upper cover (30) are fixed on the bushing (2) by the cover connecting bolts (44).
9. A condensate pump series-parallel double-end-face mechanical seal device according to claim 8, characterized in that, The upper end of the upper cover (30) is provided with a positioning plate (45), and the positioning plate (45) is fixed on the upper cover (30) by the positioning plate fixing bolt (46).
10. A condensate pump series-parallel double-end-face mechanical seal device according to claim 1, characterized in that, The upper end of the bushing (2) is provided with a locking sleeve (31), and the locking sleeve (31) is covered with a compression ring A (32) and a compression ring B (33). The compression ring A (32) and the compression ring B (33) are locked and fixed by compression ring bolts (34).