Centrifugal pump sealing device and centrifugal pump

Abstract

The utility model relates to the technical field of centrifugal pumps, in particular to a centrifugal pump sealing device and a centrifugal pump, which comprise a centrifugal pump shell, a pump cover is fixedly mounted on the back of the centrifugal pump shell, a pump shaft is rotatably connected inside the centrifugal pump shell, and a sealing cover is fixedly mounted on the outer side of the pump shaft and positioned on the back of the pump cover. The inner sealing assembly is installed in the sealing cover and located on the outer side of the pump shaft, and the inner sealing assembly is used for inner sealing of the sealing cover; the centrifugal pump sealing device comprises a centrifugal pump shell, a sealing cover is installed on the back face of the sealing cover, the outer sealing assembly is installed on the back face of the sealing cover, the outer sealing assembly is used for outer sealing of the sealing cover, an impeller is fixedly connected to the position, located in the centrifugal pump shell, of the front end of a pump shaft, and the outer side of the pump shaft is rotationally connected with the pump cover through a bearing. Through the design, the integral sealing effect of the centrifugal pump sealing device and the centrifugal pump can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a centrifugal pump sealing device and a centrifugal pump. Background Art

[0002] A centrifugal pump is a pump that transports liquid by the centrifugal force generated by the rotation of the impeller. A centrifugal pump works by using the centrifugal motion of water caused by the rotation of the impeller. Before starting the pump, the pump casing and the suction pipe must be filled with water, and then the motor is started so that the pump shaft drives the impeller and water to rotate at high speed. The water undergoes centrifugal motion and is thrown to the outer edge of the impeller, flowing into the water pressure pipeline of the pump through the flow channel of the volute pump casing.

[0003] In the prior art, during the operation of the centrifugal pump, the impeller and the pump shaft will generate high temperature during the rotation process, and the mechanical seal of the centrifugal pump is generally a rubber seal, which is a wearing part. After long-term use, it is easy to cause damage to the mechanical seal of the centrifugal pump. The worn rubber seal will produce a certain gap between the rotating shaft or the pump casing, resulting in a reduction in the service life of the mechanical seal of the centrifugal pump and an increase in the replacement frequency of the mechanical seal, which not only increases the cost of use, but also affects the efficiency of the centrifugal pump.

[0004] Therefore, it is particularly important to design a centrifugal pump sealing device and a centrifugal pump to solve the above-mentioned defects. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model designs a centrifugal pump sealing device and a centrifugal pump, which aim to solve the technical problem that after long-term use of the centrifugal pump in the prior art, the mechanical seal of the centrifugal pump is easily damaged, the worn rubber seal will produce a certain gap between the rotating shaft or the pump casing, resulting in a reduction in the service life of the mechanical seal of the centrifugal pump and an increase in the replacement frequency of the mechanical seal, which not only increases the cost of use but also affects the technical problem of the use efficiency of the centrifugal pump.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A centrifugal pump sealing device comprises a centrifugal pump housing, a pump cover is fixedly installed on the back of the centrifugal pump housing, a pump shaft is rotatably connected inside the centrifugal pump housing, a sealing cover is fixedly installed on the outside of the pump shaft and on the back of the pump cover, and further comprises:

[0008] An inner sealing assembly, which is installed inside the sealing cover and located outside the pump shaft, and is used for inner sealing of the sealing cover;

[0009] The inner sealing assembly comprises a top cover sleeved on the outside of the pump shaft, a top sleeve sleeved on the outside of the pump shaft and located behind the top cover, a first spring is fixedly connected between the top cover and the top sleeve, and a rubber sealing sleeve sleeved on the outside of the pump shaft and located between the top sleeve and the sealing cover;

[0010] An outer sealing component, which is installed on the back of the sealing cover and is used for outer sealing of the sealing cover;

[0011] The outer sealing assembly includes a plurality of pressure plates rotatably connected to the back of the pump cover, the pressure plates are fixedly connected to a connecting sleeve at one end close to the sealing cover, a telescopic column is slidably connected to the inner side of the connecting sleeve, and the end of the telescopic column located on the inner side of the connecting sleeve is fixedly connected to a second spring.

[0012] As a preferred solution of the utility model, an impeller is fixedly connected to the front end of the pump shaft and located inside the centrifugal pump housing, and the outer side of the pump shaft is rotatably connected to the pump cover through a bearing.

[0013] As a preferred solution of the utility model, the outer side of the pump cover is fixedly connected to the centrifugal pump casing by multiple groups of first fixing bolts, the outer side of the sealing cover is fixedly connected to the pump cover by multiple groups of second fixing bolts, and a rubber sealing ring is installed between the sealing cover and the pump cover.

[0014] The utility model also provides a centrifugal pump, comprising any one of the centrifugal pump sealing devices described above, and further comprising:

[0015] The base is fixedly mounted on the bottom of the centrifugal pump housing, and a centrifugal pump motor is fixedly mounted on the rear end of the top of the base, and the driving end of the centrifugal pump motor is connected to the pump shaft through a coupling.

[0016] As a preferred solution of the utility model, a protective cover is provided on the top of the base and located on the outside of the coupling, a plurality of heat dissipation holes are provided on the outside of the protective cover, and the bottom end of the protective cover is fixedly connected to the base by mounting bolts.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] In the utility model, through the coordinated design of the inner sealing component and the outer sealing component, when the centrifugal pump is in use, under the action of the first spring, the top cover is pressed against the bearing to ensure the tightness of the bearing, and at the same time, the top sleeve is continuously pressed against the rubber sealing sleeve to ensure the sealing of the pump shaft. At the same time, the connection between the pump shaft and the sealing cover is still squeezed and sealed after wear to avoid the generation of gaps, thereby improving the service life of the mechanical seal of the centrifugal pump. While ensuring the sealing effect of the inner side of the sealing cover, the pressure plate is rotated to cover the back side of the sealing cover. Under the action of the second spring, the telescopic column is continuously pressed against the back side of the sealing cover, so that the connection between the sealing cover and the pump cover is tighter, further improving the sealing effect of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall external structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the coupling of the utility model;

[0021] Figure 3 This is a schematic diagram of the overall internal structure of the utility model;

[0022] Figure 4 for Figure 3 A magnified schematic diagram of the middle part;

[0023] Figure 5 for Figure 3 Enlarged schematic diagram of part B in the middle.

[0024] In the figure: 1. centrifugal pump casing; 2. pump cover; 201. first fixing bolt; 3. pump shaft; 301. impeller; 302. bearing; 4. sealing cover; 401. second fixing bolt; 402. rubber sealing ring; 5. inner sealing assembly; 501. top cover; 502. top sleeve; 503. first spring; 504. rubber sealing sleeve; 6. outer sealing assembly; 601. pressure plate; 602. connecting sleeve; 603. telescopic column; 604. second spring; 7. base; 701. protective cover; 702. heat dissipation hole; 8. centrifugal pump motor; 9. coupling. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0026] Example:

[0027] See also Figure 1-Figure 5, the utility model provides a technical solution:

[0028] A centrifugal pump sealing device comprises a centrifugal pump housing 1, a pump cover 2 is fixedly installed on the back of the centrifugal pump housing 1, a pump shaft 3 is rotatably connected inside the centrifugal pump housing 1, a sealing cover 4 is fixedly installed on the outside of the pump shaft 3 and on the back of the pump cover 2, and further comprises:

[0029] An inner sealing assembly 5, which is installed inside the sealing cover 4 and located outside the pump shaft 3, and is used for inner sealing of the sealing cover 4;

[0030] The outer sealing component 6 is installed on the back side of the sealing cover 4 and is used for the outer sealing of the sealing cover 4 .

[0031] First, the front end of the pump shaft 3 is fixedly connected to the impeller 301 inside the centrifugal pump casing 1, and the outer side of the pump shaft 3 is rotatably connected to the pump cover 2 through the bearing 302. The pump shaft 3 is rotatably connected to the pump cover 2 through the bearing 302. When the pump shaft 3 rotates, it drives the impeller 301 to rotate, thereby pumping the material.

[0032] Furthermore, the outer side of the pump cover 2 is fixedly connected to the centrifugal pump casing 1 by multiple groups of first fixing bolts 201, and the outer side of the sealing cover 4 is fixedly connected to the pump cover 2 by multiple groups of second fixing bolts 401. A rubber sealing ring 402 is installed between the sealing cover 4 and the pump cover 2. The pump cover 2 is installed on the back side of the centrifugal pump casing 1 by multiple groups of first fixing bolts 201, and then the sealing cover 4 is pressed against the back side of the pump cover 2 by the second fixing bolts 401, so as to seal the pump shaft 3 and the pump cover 2, and at the same time, the rubber sealing ring 402 is used to ensure the sealing effect of the sealing cover 4.

[0033] Then, the inner sealing assembly 5 includes a top cover 501 sleeved on the outside of the pump shaft 3, a top sleeve 502 is sleeved on the outside of the pump shaft 3 and located behind the top cover 501, a first spring 503 is fixedly connected between the top cover 501 and the top sleeve 502, and a rubber sealing sleeve 504 is sleeved on the outside of the pump shaft 3 and located between the top sleeve 502 and the sealing cover 4. When the centrifugal pump is in use, under the action of the first spring 503, the top cover 501 is pushed against the bearing 302 to ensure the tightness of the bearing 302, and at the same time, the top sleeve 502 is continuously pressed against the rubber sealing sleeve 504, which ensures the sealing of the pump shaft 3. At the same time, the connection between the pump shaft 3 and the sealing cover 4 is still squeezed and sealed after wear to avoid the generation of gaps, thereby improving the service life of the mechanical seal of the centrifugal pump.

[0034] Furthermore, the outer sealing assembly 6 includes a plurality of pressure plates 601 rotatably connected to the back of the pump cover 2, and one end of the pressure plate 601 close to the sealing cover 4 is fixedly connected to a connecting sleeve 602, and a telescopic column 603 is slidably connected to the inner side of the connecting sleeve 602, and one end of the telescopic column 603 located on the inner side of the connecting sleeve 602 is fixedly connected to a second spring 604. While ensuring the sealing effect on the inner side of the sealing cover 4, the pressure plate 601 is rotated to cover the back of the sealing cover 4. Under the action of the second spring 604, the telescopic column 603 continues to press against the back of the sealing cover 4, so that the connection between the sealing cover 4 and the pump cover 2 is tighter, further improving the sealing effect of the sealing cover 4.

[0035] The utility model also provides a centrifugal pump, further comprising:

[0036] The base 7 is fixedly mounted on the bottom of the centrifugal pump casing 1. A centrifugal pump motor 8 is fixedly mounted on the rear end of the top of the base 7. The driving end of the centrifugal pump motor 8 is connected to the pump shaft 3 through a coupling 9. The centrifugal pump casing 1 and the centrifugal pump motor 8 are installed through the base 7. The centrifugal pump motor 8 is connected to the pump shaft 3 through the coupling 9, thereby driving the pump shaft 3 to rotate.

[0037] Finally, a protective cover 701 is provided on the top of the base 7 and on the outside of the coupling 9. A plurality of heat dissipation holes 702 are provided on the outside of the protective cover 701. The bottom end of the protective cover 701 is fixedly connected to the base 7 by mounting bolts. When the coupling 9 is working, the protective cover 701 is used to protect the outside thereof, and the heat dissipation holes 702 are used to improve the heat dissipation effect of the protective cover 701.

[0038] In this embodiment, the implementation scenario is specifically as follows: when the centrifugal pump is in use, the centrifugal pump housing 1 and the centrifugal pump motor 8 are installed through the base 7, and the centrifugal pump motor 8 is connected to the pump shaft 3 through the coupling 9, thereby driving the pump shaft 3 to rotate, and the pump shaft 3 is rotatably connected to the pump cover 2 through the bearing 302. When the pump shaft 3 rotates, the impeller 301 is driven to rotate, thereby pumping the material. When the centrifugal pump is in use, under the action of the first spring 503, the top cover 501 is pushed against the bearing 302 to ensure the tightness of the bearing 302, and at the same time, the top sleeve 502 is continuously pushed against the rubber sealing sleeve 504, so as to ensure the sealing of the pump shaft 3 while maintaining the tightness after wear. Then, the connection between the pump shaft 3 and the sealing cover 4 is squeezed and sealed to avoid the generation of gaps, thereby increasing the service life of the mechanical seal of the centrifugal pump. While ensuring the sealing effect of the inner side of the sealing cover 4, the pressure plate 601 is rotated to cover the back side of the sealing cover 4. Under the action of the second spring 604, the telescopic column 603 continues to press against the back side of the sealing cover 4, so that the connection between the sealing cover 4 and the pump cover 2 is tighter, further improving the sealing effect of the sealing 4. The entire operation process is simple and convenient. Compared with the existing centrifugal pump sealing device and centrifugal pump, the utility model can improve the overall sealing effect of the centrifugal pump sealing device and the centrifugal pump through design.

Claims

1. A centrifugal pump sealing device, comprising a centrifugal pump housing (1), a pump cover (2) fixedly mounted on the back of the centrifugal pump housing (1), a pump shaft (3) rotatably connected inside the centrifugal pump housing (1), a sealing cover (4) fixedly mounted on the outside of the pump shaft (3) and located on the back of the pump cover (2), characterized in that: Also includes: An inner sealing component (5), the inner sealing component (5) is installed inside the sealing cover (4) and is located outside the pump shaft (3), and the inner sealing component (5) is used for inner sealing of the sealing cover (4); The inner sealing assembly (5) comprises a top cover (501) sleeved on the outside of the pump shaft (3); a top sleeve (502) is sleeved on the outside of the pump shaft (3) and located behind the top cover (501); a first spring (503) is fixedly connected between the top cover (501) and the top sleeve (502); and a rubber sealing sleeve (504) is sleeved on the outside of the pump shaft (3) and located between the top sleeve (502) and the sealing cover (4); An external sealing component (6), the external sealing component (6) being mounted on the back side of the sealing cover (4), the external sealing component (6) being used for external sealing of the sealing cover (4); The outer sealing assembly (6) includes a plurality of pressure plates (601) rotatably connected to the back of the pump cover (2), the pressure plates (601) are fixedly connected to one end of the sealing cover (4) with a connecting sleeve (602), the inner side of the connecting sleeve (602) is slidably connected to a telescopic column (603), and the end of the telescopic column (603) located on the inner side of the connecting sleeve (602) is fixedly connected to a second spring (604).

2. A centrifugal pump sealing device according to claim 1, characterized in that: An impeller (301) is fixedly connected to the front end of the pump shaft (3) and located inside the centrifugal pump housing (1), and the outer side of the pump shaft (3) is rotatably connected to the pump cover (2) via a bearing (302).

3. A centrifugal pump sealing device according to claim 1, characterized in that: The outer side of the pump cover (2) is fixedly connected to the centrifugal pump housing (1) via multiple groups of first fixing bolts (201), the outer side of the sealing cover (4) is fixedly connected to the pump cover (2) via multiple groups of second fixing bolts (401), and a rubber sealing ring (402) is installed between the sealing cover (4) and the pump cover (2).

4. A centrifugal pump, characterized in that: The centrifugal pump sealing device according to any one of claims 1 to 3 further comprises: A base (7), the base (7) is fixedly mounted on the bottom of the centrifugal pump housing (1), a centrifugal pump motor (8) is fixedly mounted on the rear end of the top of the base (7), and a driving end of the centrifugal pump motor (8) is connected to the pump shaft (3) via a coupling (9).

5. A centrifugal pump according to claim 4, characterized in that: A protective cover (701) is sleeved on the top of the base (7) and located on the outside of the coupling (9). A plurality of heat dissipation holes (702) are provided on the outside of the protective cover (701). The bottom end of the protective cover (701) is fixedly connected to the base (7) by means of mounting bolts.

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