Pipeline type centrifugal pump suitable for media easy to crystallize

Abstract

The utility model belongs to the technical field of centrifugal pumps, and particularly relates to a pipeline type centrifugal pump suitable for media easy to crystallize. One end of an impeller is fixedly connected with a rotating shaft, one end, close to a motor, of a pump body is connected with a pump cover, and a connecting frame used for connecting the pump body and the motor is fixedly installed on the outer side of the pump cover; the mechanical sealing piece comprises a wear-resistant assembly and a movable sealing ring which are arranged on the rotating shaft in a sleeving mode, the sealing effect is achieved, the arranged mechanical sealing piece has high wear resistance, damage to the mechanical sealing piece caused by hard particles in a medium prone to crystallization can be reduced, and the wear-resistant service life is prolonged; the water inlet is formed in one side of the pump body, external water enters the pump cavity in the pump body from the water inlet, the water outlet is formed in the other side of the pump body and communicated with the pump cavity, and during use, water in the pump cavity is discharged from the water outlet.

Description

Technical Field

[0001] The utility model belongs to the technical field of centrifugal pumps, and in particular relates to a pipeline centrifugal pump suitable for easy-crystallization media. Background Art

[0002] Pipeline centrifugal pumps are used to transport clean water, corrosive liquids or other liquids with physical and chemical properties similar to water. They are suitable for industrial and urban drainage, high-rise building pressurized water supply, fire-fighting pressurization and long-distance transportation. When traditional pipeline centrifugal pumps are used to process media containing easily crystallized substances, the seals between the impeller, pump body and motor shaft are often severely worn, thereby affecting the sealing effect and causing leakage in the centrifugal pump. Utility Model Content

[0003] The purpose of the utility model is to provide a pipeline centrifugal pump suitable for easy-to-crystallize medium in view of the above-mentioned technical problems, so as to solve the problems raised in the above-mentioned background technology.

[0004] In view of this, the utility model provides a pipeline centrifugal pump suitable for easy crystallization medium, comprising a pump body, a water inlet is opened on one side of the pump body, and a water outlet is opened on the other side;

[0005] The motor is arranged on one side of the pump body, the rotating shaft of the motor extends into the pump body and is coaxially connected to the impeller, a pump cover is connected to one end of the pump body close to the motor, and a connecting frame is fixedly installed on the outside of the pump cover;

[0006] A mechanical seal is sleeved on the rotating shaft and is located between the impeller and the pump cover;

[0007] Among them, the mechanical seal includes a wear-resistant component and a dynamic sealing ring.

[0008] In the above technical solution, further, the wear-resistant component includes:

[0009] A static friction ring, which is sleeved on the rotating shaft and has one end abutting against the pump cover;

[0010] The dynamic friction ring is sleeved on the rotating shaft, and one end of the dynamic friction ring abuts against the static friction ring, and the other end abuts against the impeller.

[0011] In the above technical solution, further, the surfaces where the static friction ring and the dynamic friction ring abut against each other are both narrow surfaces.

[0012] In the above technical solution, further, one end of the dynamic sealing ring abuts against the rotating shaft, and the other end abuts against an end of the dynamic friction ring away from the static friction ring.

[0013] In the above technical solution, further, it also includes:

[0014] A tightening block is fixedly connected to the rotating shaft through a tightening screw. An extension block is arranged at one end of the tightening block close to the dynamic friction ring, and the extension block is pressed against the dynamic friction ring.

[0015] In the above technical solution, further, a butterfly spring is arranged between the tightening block and the dynamic friction ring.

[0016] In the above technical solution, further, the extension block and the tightening block are integrally formed.

[0017] In the above technical solution, further, a sealing gasket is arranged between the static friction ring and the pump cover.

[0018] The beneficial effects of the utility model are:

[0019] 1. The static friction ring and the dynamic friction ring in the wear-resistant component constitute a friction pair structure. The friction pair structure can ensure that the friction coefficient remains stable at different rotation speeds of the shaft, thereby improving the stability of the structure during operation.

[0020] 2. The dynamic friction ring is pressed against the rotating shaft by the extension block on the tightening block, which can reduce the slip between the dynamic friction ring and the rotating shaft caused by the slip during the start-up, shutdown and operation of the pump, and reduce the wear of the rotating shaft.

[0021] 3. The butterfly spring is set to improve the unbalanced thrust of ordinary mechanical seals, so that the dynamic friction ring is subjected to multi-point thrust to achieve balanced pressure between the two friction surfaces, and prevent the two mating surfaces from being partially opened during the axial movement of the shaft, which may cause the liquid film to be broken and allow particles to enter the sealing surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the utility model;

[0023] Figure 2 This utility model Figure 1 A partial enlarged view of the middle A;

[0024] The markings in the figure are: 1-pump body, 2-water inlet, 3-water outlet, 4-motor, 5-rotating shaft, 6-impeller, 7-pump cover, 8-connecting frame, 9-mechanical seal, 10-dynamic sealing ring, 11-static friction ring, 12-dynamic friction ring, 13-tightening block, 14-extension block, 15-butterfly spring, 16-sealing gasket, 17-tightening screw. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0026] Embodiment 1:

[0027] This embodiment provides a pipeline centrifugal pump suitable for easily crystallized media, comprising:

[0028] A pump body 1, wherein a water inlet 2 is provided on one side of the pump body 1, and a water outlet 3 is provided on the other side;

[0029] The motor 4 is arranged at one side of the pump body 1. The rotating shaft 5 of the motor 4 extends into the pump body 1 and is coaxially connected with the impeller 6. The end of the pump body 1 close to the motor 4 is connected with a pump cover 7. A connecting frame 8 is fixedly installed on the outer side of the pump cover 7.

[0030] A mechanical seal 9 is sleeved on the rotating shaft 5 and is located between the impeller 6 and the pump cover 7;

[0031] The mechanical seal 9 includes a wear-resistant component and a dynamic seal ring 10 .

[0032] It can be seen from the present embodiment that one end of the impeller 6 is fixedly connected to the rotating shaft 5, and the end of the pump body 1 close to the motor 4 is connected to the pump cover 7. A connecting frame 8 for connecting the pump body 1 and the motor 4 is fixedly installed on the outer side of the pump cover 7. The mechanical seal 9 includes a wear-resistant component and a dynamic seal ring 10 sleeved on the rotating shaft 5 to achieve a sealing effect. The mechanical seal 9 has strong wear resistance, which can reduce the damage of hard particles in the easily crystallized medium to the mechanical seal 9 and extend the wear-resistant service life. The rotating shaft 5 of the motor 4 drives the impeller 6 to rotate, and the external water enters the pump chamber inside the pump body 1 from the water inlet 2. A water outlet 3 is opened on the other side of the pump body 1, and the water outlet 3 is communicated with the pump chamber. When in use, the water in the pump chamber is discharged through the water outlet 3.

[0033] Embodiment 2:

[0034] This embodiment provides a pipeline centrifugal pump suitable for easily crystallized media. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0035] Wear-resistant components include:

[0036] A static friction ring 11, which is sleeved on the rotating shaft 5, and one end of which is in contact with the pump cover 7;

[0037] The dynamic friction ring 12 is sleeved on the rotating shaft 5 , and one end of the dynamic friction ring 12 abuts against the static friction ring 11 , and the other end abuts against the impeller 6 .

[0038] It can be seen from this embodiment that the static friction ring 11 and the dynamic friction ring 12 in the wear-resistant component constitute a friction pair structure. The friction pair structure can ensure that the friction coefficient remains stable at different rotation speeds of the rotating shaft 5, thereby improving the stability of the structure during operation, and the static friction ring 11 and the dynamic friction ring 12 can be made of high-strength materials such as cemented carbide to increase the wear-resistant life of the static friction ring 11 and the dynamic friction ring 12, reduce the damage of hard particles in the medium to the friction pair mating surface, and reduce the probability of particles entering the motor 4.

[0039] Embodiment 3:

[0040] This embodiment provides a pipeline centrifugal pump suitable for easily crystallized media. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0041] The surfaces where the static friction ring 11 and the dynamic friction ring 12 abut against each other are both narrow surfaces.

[0042] It can be seen from this embodiment that the surface where the static friction ring 11 contacts the dynamic friction ring 1 is designed as a narrow surface, which reduces the friction area and prolongs the service life.

[0043] Embodiment 4:

[0044] This embodiment provides a pipeline centrifugal pump suitable for easily crystallized media. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0045] One end of the dynamic sealing ring 10 abuts against the rotating shaft 5 , and the other end abuts against an end of the dynamic friction ring 12 away from the static friction ring 11 .

[0046] It can be seen from this embodiment that a dynamic sealing ring 10 is provided, one end of which abuts against the rotating shaft 5 , and the other end abuts against an end of the dynamic friction ring 12 away from the static friction ring 11 .

[0047] Embodiment 5:

[0048] This embodiment provides a pipeline centrifugal pump suitable for easily crystallized media. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0049] Also includes:

[0050] The tightening block 13 is fixedly connected to the rotating shaft 5 through a tightening screw 17 . An extension block 14 is provided at one end of the tightening block 13 close to the dynamic friction ring 12 , and the extension block 14 is pressed against the dynamic friction ring 12 .

[0051] It can be seen from this embodiment that the tightening block 13 is fixedly connected to the rotating shaft 5 through the tightening screw 17, the connection is tight, and the installation and disassembly are simple. The dynamic friction ring 12 is pressed against the rotating shaft 5 through the extension block 14 on the tightening block 13, which can reduce the slip between the dynamic seal ring 10 and the rotating shaft 5 caused by the slip during the start-up, shutdown and operation of the pump, and reduce the wear of the rotating shaft. After working in a medium that is easy to crystallize for a long time, scaling will occur on the surface of the friction pair structure. The tightening block 13 can prevent the dynamic friction ring 12 from having the two friction pairs sticking due to insufficient torsional torque.

[0052] Embodiment 6:

[0053] This embodiment provides a pipeline centrifugal pump suitable for easily crystallized media. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0054] A disc spring 15 is arranged between the pressing block 13 and the dynamic friction ring 12 .

[0055] It can be seen from the present embodiment that the unbalanced thrust of the ordinary mechanical seal is improved by the butterfly spring 15, so that the dynamic friction ring 12 is subjected to multi-point thrust, so as to achieve a balanced pressure between the two friction surfaces, and prevent the two mating surfaces from being partially opened when the shaft 5 moves axially, thereby preventing the liquid film from being destroyed and causing particles to enter the sealing surface.

[0056] Embodiment 7:

[0057] This embodiment provides a pipeline centrifugal pump suitable for easily crystallized media. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0058] The extension block 14 and the tightening block 13 are integrally formed.

[0059] It can be seen from this embodiment that the extension block 14 and the tightening block 13 are integrally formed, and the structure has high strength and long service life.

[0060] Embodiment 8:

[0061] This embodiment provides a pipeline centrifugal pump suitable for easily crystallized media. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0062] A sealing gasket 16 is provided between the static friction ring 11 and the pump cover 7 .

[0063] It can be seen from this embodiment that the sealing gasket 16 is provided to further enhance the sealing performance and reduce the possibility of particles in the medium accidentally entering the motor 4 .

[0064] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A pipeline centrifugal pump suitable for easily crystallized media, characterized in that: include: A pump body (1), wherein one side of the pump body (1) is provided with a water inlet (2), and the other side of the pump body (1) is provided with a water outlet (3); A motor (4), wherein the motor (4) is arranged on one side of the pump body (1), a rotating shaft (5) of the motor (4) extends into the pump body (1) and is coaxially connected to the impeller (6), a pump cover (7) is connected to one end of the pump body (1) close to the motor (4), and a connecting frame (8) is fixedly mounted on the outer side of the pump cover (7); A mechanical seal (9), wherein the mechanical seal (9) is sleeved on the rotating shaft (5) and is located between the impeller (6) and the pump cover (7); The mechanical seal (9) comprises a wear-resistant component and a dynamic seal ring (10).

2. A pipeline centrifugal pump suitable for easily crystallized media according to claim 1, characterized in that: The wear-resistant component comprises: A static friction ring (11), wherein the static friction ring (11) is sleeved on the rotating shaft (5), and one end of the static friction ring (11) is in contact with the pump cover (7); A dynamic friction ring (12) is sleeved on the rotating shaft (5), one end of the dynamic friction ring (12) is in contact with the static friction ring (11), and the other end of the dynamic friction ring (12) is in contact with the impeller (6).

3. A pipeline centrifugal pump suitable for easily crystallized media according to claim 2, characterized in that: The surfaces where the static friction ring (11) and the dynamic friction ring (12) abut against each other are both relatively narrow surfaces.

4. A pipeline centrifugal pump suitable for easily crystallized media according to claim 3, characterized in that: One end of the dynamic sealing ring (10) abuts against the rotating shaft (5), and the other end abuts against an end of the dynamic friction ring (12) away from the static friction ring (11).

5. A pipeline centrifugal pump suitable for easily crystallized media according to claim 4, characterized in that: Also includes: A tightening block (13) is fixedly connected to the rotating shaft (5) via a tightening screw (17); an extension block (14) is provided at one end of the tightening block (13) close to the dynamic friction ring (12), and the extension block (14) is pressed against the dynamic friction ring (12).

6. A pipeline centrifugal pump suitable for easily crystallized media according to claim 5, characterized in that: A butterfly spring (15) is arranged between the tightening block (13) and the dynamic friction ring (12).

7. A pipeline centrifugal pump suitable for easily crystallized media according to claim 6, characterized in that: The extension block (14) and the tightening block (13) are integrally formed.

8. A pipeline centrifugal pump suitable for easily crystallized media according to claim 7, characterized in that: A sealing gasket (16) is provided between the static friction ring (11) and the pump cover (7).

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