Ceramic centrifugal pump

Abstract

The utility model relates to a ceramic centrifugal pump which comprises a pump body, a pump shaft, a front pump cover and a rear pump cover, the front pump cover and the rear pump cover are installed on the front side and the rear side of the pump body respectively, a mechanical seal is arranged between the pump shaft and the rear pump cover, and a front pump cover ceramic piece, a pump body ceramic piece and a rear pump cover ceramic piece are arranged on the inner wall of the front pump cover, the inner wall of the pump body and the inner wall of the rear pump cover respectively. The outer layer of the pump shaft is sleeved with a protective sleeve, and the pump shaft is isolated from liquid in the pump cavity. The mechanical seal comprises a shell installed on the rear pump cover, a static ring fixedly installed on the shell and a movable ring which is fixedly installed on the pump shaft protection sleeve and rotates along with the pump shaft, and the static ring and the movable ring are both made of ceramic materials and are in plane sliding contact. The corrosion resistance and the abrasion resistance of the pump shaft and the mechanical seal are enhanced, the service life of the ceramic centrifugal pump is further prolonged, and the use cost of the ceramic centrifugal pump is reduced.

Description

Technical Field

[0001] The utility model relates to a ceramic centrifugal pump, belonging to the technical field of centrifugal pumps. Background Art

[0002] A centrifugal pump is a pump that transports liquids by the centrifugal force generated when the impeller rotates. It is mainly designed and manufactured with a fully metal structure and is widely used in various industrial fields. Since the centrifugal pump with a fully metal structure has its flow-through components (front pump cover, impeller, pump body, rear pump cover) made of metal, when transporting highly corrosive or particulate-containing liquid media, it is easily corroded and worn, resulting in a significant reduction in service life.

[0003] The ceramic centrifugal pump is provided with a layer of ceramic material layer on the inner wall of its flow-through components, and by utilizing the excellent corrosion resistance and wear resistance of the ceramic material, the service life of the flow-through components of the centrifugal pump is greatly improved. However, since the pump shaft and the sealing mechanism of the ceramic centrifugal pump still adopt a metal structure, when they are exposed to highly corrosive or particulate-containing liquid media, premature corrosion and wear problems will still occur, becoming a weak link in the anti-wear and corrosion resistance of the ceramic centrifugal pump, thereby reducing the overall service life of the ceramic centrifugal pump. Therefore, it is urgent to improve and upgrade the pump shaft and mechanical seal to enhance their corrosion resistance and wear resistance, thereby improving the overall service life of the ceramic centrifugal pump. Summary of the Invention

[0004] The purpose of the utility model is to overcome the above deficiencies, provide a ceramic centrifugal pump, strengthen the corrosion resistance and wear resistance of the pump shaft and the mechanical seal, further improve the service life of the ceramic centrifugal pump, and reduce the use cost of the ceramic centrifugal pump.

[0005] The purpose of the utility model is achieved as follows:

[0006] A ceramic centrifugal pump includes a pump body, a pump shaft, a front pump cover and a rear pump cover respectively installed on the front and rear sides of the pump body. A mechanical seal is provided between the pump shaft and the rear pump cover. Front pump cover ceramic parts, pump body ceramic parts and rear pump cover ceramic parts are respectively provided on the inner walls of the front pump cover, the pump body and the rear pump cover. A protective sleeve is sleeved on the outer layer of the pump shaft to isolate the pump shaft from the liquid in the pump cavity. The mechanical seal includes a housing installed on the rear pump cover, a stationary ring fixedly installed on the housing, and a rotating ring fixedly installed on the protective sleeve of the pump shaft and rotating with the pump shaft. Both the stationary ring and the rotating ring are made of ceramic material and are in planar sliding contact with each other.

[0007] Further, the front pump cover ceramic parts, the pump body ceramic parts and the rear pump cover ceramic parts are respectively connected to the front pump cover, the pump body and the rear pump cover through bonding layers.

[0008] Further, a plurality of protective sleeves are sleeved on the pump shaft, and sealing rings are provided between adjacent protective sleeves.

[0009] Further, the stationary ring and the rotating ring respectively include a left stationary ring, a left rotating ring, a right stationary ring and a right rotating ring that are slidably paired; a ceramic retaining ring is provided between the end faces of the housing and the ceramic part of the rear pump cover, and the left stationary ring is embedded in the inner ring of the ceramic retaining ring; a collar is slidably sleeved between the left rotating ring and the right rotating ring, and a plurality of groups of springs that provide elastic force are evenly arranged between the left rotating ring and the right rotating ring inside the collar.

[0010] Further, sealing rings are provided on the contact surfaces between the housing, the ceramic part of the rear pump cover, the ceramic retaining ring, the left stationary ring and the right stationary ring.

[0011] Further, a retaining rib for preventing the liquid medium from rotating in the pump chamber is provided on the inner wall of the ceramic part of the rear pump cover.

[0012] Further, a cooling water interface for connecting the inlet and outlet of cooling water to the inner cavity of the mechanical seal is provided on the housing.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] By sleeving a protective sleeve on the pump shaft, the present utility model isolates the pump shaft from the corrosive or particulate-containing liquid medium to protect the pump shaft; the stationary ring, the rotating ring and the ceramic retaining ring that are in direct contact with the liquid medium inside the pump chamber of the mechanical seal are all made of ceramic materials, which improves the corrosion resistance and wear resistance of the mechanical seal, solves the problem of short service life of local components in the existing ceramic centrifugal pump, further improves the overall service life of the ceramic centrifugal pump, and further reduces the use cost of the ceramic centrifugal pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of a ceramic centrifugal pump of the present utility model.

[0016] Figure 2 is a schematic structural diagram of the mechanical seal of a ceramic centrifugal pump of the present utility model.

[0017] Among them:

[0018] pump body 1, front pump cover 2, rear pump cover 3, mechanical seal 4, protective sleeve 5, pump shaft 6, bonding layer 7, sealing ring 8;

[0019] ceramic part of pump body 11, ceramic part of front pump cover 21, ceramic part of rear pump cover 31, retaining rib 32, housing 41, left stationary ring 42, right stationary ring 43, left rotating ring 44, right rotating ring 45, ceramic retaining ring 46, collar 47, spring 48, cooling water interface 49. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] See Figures 1 to 2The utility model relates to a ceramic centrifugal pump, comprising a pump body 1, a pump shaft 6, a front pump cover 2 and a rear pump cover 3 respectively installed on the front and rear sides of the pump body 1, a mechanical seal 4 is provided between the pump shaft 6 and the rear pump cover 3, and a front pump cover ceramic part 21, a pump body ceramic part 11 and a rear pump cover ceramic part 31 are respectively provided on the inner walls of the front pump cover 2, the pump body 1 and the rear pump cover 3, the front pump cover ceramic part 21, the pump body ceramic part 11 and the rear pump cover ceramic part 31 are respectively connected to the front pump cover 2, the pump body 1 and the rear pump cover 3 through a bonding layer 7, a ceramic protective layer is provided inside the pump cavity, the front pump cover 2, the pump body 1 and the rear pump cover 3 are isolated from the corrosive or particle-containing liquid medium in the pump cavity, and the front pump cover 2, the pump body 1 and the rear pump cover 3 are prevented from corrosion or wear;

[0021] The outer layer of the pump shaft 6 is sheathed with a plurality of protective sleeves 5 connected end to end, and a sealing ring 8 is arranged between adjacent protective sleeves 5. The protective sleeves 5 isolate the pump shaft 6 from the corrosive or particle-containing liquid medium in the pump chamber to prevent the pump shaft 6 from corrosion or wear;

[0022] The mechanical seal 4 comprises a shell 41 mounted on the rear pump cover 3, a stationary ring fixed on the shell 41, and a moving ring fixed on the pump shaft 6 protective sleeve 5 and rotating with the pump shaft 6, the stationary ring and the moving ring are both made of ceramic materials and there is a planar sliding contact between the two; the stationary ring and the moving ring respectively comprise a sliding paired left stationary ring 42, a left moving ring 44 and a right stationary ring 43, and a right moving ring 45; a ceramic retaining ring 46 is provided between the shell 41 and the end face of the rear pump cover ceramic part 31, and the left stationary ring 42 is embedded in the inner ring of the ceramic retaining ring 46; a sleeve ring 47 is slidably mounted between the left moving ring 44 and the right moving ring 45, and a plurality of groups of springs 48 providing elastic force are evenly arranged between the left moving ring 44 and the right moving ring 45 inside the sleeve ring 47 to provide sealing pressure between the moving ring and the stationary ring; sealing rings 8 are provided on the contact surfaces between the shell 41, the rear pump cover ceramic part 31, the ceramic retaining ring 46, the left stationary ring 42, and the right stationary ring 43. The ceramic retaining ring 46, the left static ring 42, and the left dynamic ring 44, which are in direct contact with the corrosive or particle-containing liquid medium in the pump cavity, are all made of ceramic materials. Therefore, the corrosion resistance and wear resistance of the mechanical seal are also effectively improved. The housing 41 is provided with a cooling water interface 49 for connecting cooling water in and out of the inner cavity of the mechanical seal 4. Due to the planar sliding friction between the static ring and the dynamic ring, heat accumulation will be generated during operation. The cooling water is introduced to take away the heat, making the static ring and the dynamic ring work more stably and ensuring the sealing effect;

[0023] Furthermore, since the liquid medium at the rear end of the pump chamber will rotate with the rotation of the pump shaft 6 to form a liquid vortex, thereby accelerating the corrosion and wear of the direct contact parts such as the pump shaft 6, the rear pump cover ceramic part 31, the ceramic retaining ring 46, and the left static ring 42, a retaining rib 32 is provided on the inner wall of the rear pump cover ceramic part 31 to prevent the occurrence of liquid vortex, thereby reducing the corrosion and wear rate of the above parts;

[0024] In the utility model, a protective sleeve 5 is sleeved on the pump shaft 6 to isolate the pump shaft 2 from corrosive or particulate liquid media, protect the pump shaft 6 and extend its service life. A ceramic retaining ring 46 is arranged between the stationary ring of the mechanical seal 4 and the ceramic part 31 of the rear pump cover to isolate the housing 41 from the liquid media and prevent it from directly contacting the liquid media. The stationary ring, rotating ring and ceramic retaining ring 46 that are in direct contact with the inside of the pump chamber of the mechanical seal are all made of ceramic materials, which improves the corrosion resistance and abrasion resistance of the mechanical seal and extends its service life. It makes up for the shortcoming of the short service life of some local components of the existing ceramic centrifugal pump, and further improves the overall service life of the ceramic centrifugal pump.

[0025] In addition, it should be noted that the above specific implementation manner is only an optimized solution of this patent, and any modification or improvement made by those skilled in the art according to the above conceptions is within the protection scope of this patent.

Claims

1. A ceramic centrifugal pump, comprising a pump body (1), a pump shaft (6), a front pump cover (2) and a rear pump cover (3) respectively installed on the front and rear sides of the pump body (1), a mechanical seal (4) is provided between the pump shaft (6) and the rear pump cover (3), front pump cover ceramic parts (21), pump body ceramic parts (11) and rear pump cover ceramic parts (31) are respectively provided on the inner walls of the front pump cover (2), the pump body (1) and the rear pump cover (3), and it is characterized in that: A protective sleeve (5) is sleeved on the outer layer of the pump shaft (6) to isolate the pump shaft (6) from the liquid in the pump chamber; the mechanical seal (4) includes a housing (41) mounted on the rear pump cover (3), a stationary ring fixedly mounted on the housing (41), and a rotating ring fixedly mounted on the protective sleeve (5) of the pump shaft (6) and rotating with the pump shaft (6). Both the stationary ring and the rotating ring are made of ceramic material and have a planar sliding contact with each other.

2. The ceramic centrifugal pump according to claim 1, wherein: The front pump cover ceramic part (21), the pump body ceramic part (11), and the rear pump cover ceramic part (31) are respectively connected to the front pump cover (2), the pump body (1), and the rear pump cover (3) through an adhesive layer (7).

3. The ceramic centrifugal pump according to claim 1, characterized in that: A plurality of protective sleeves (5) are sleeved on the pump shaft (6), and a sealing ring (8) is provided between adjacent protective sleeves (5).

4. The ceramic centrifugal pump according to claim 1, wherein: The stationary ring and the rotating ring respectively include a left stationary ring (42) and a left rotating ring (44), and a right stationary ring (43) and a right rotating ring (45) that are slidably paired; a ceramic retaining ring (46) is provided between the end faces of the housing (41) and the rear pump cover ceramic part (31), and the left stationary ring (42) is embedded in the inner ring of the ceramic retaining ring (46); a collar (47) is slidably sleeved between the left rotating ring (44) and the right rotating ring (45), and a plurality of groups of springs (48) providing elastic force are evenly provided between the left rotating ring (44) and the right rotating ring (45) inside the collar (47).

5. The ceramic centrifugal pump according to claim 4, wherein: Sealing rings (8) are provided on the contact surfaces between the housing (41), the rear pump cover ceramic part (31), the ceramic retaining ring (46), the left stationary ring (42), and the right stationary ring (43).

6. The ceramic centrifugal pump according to claim 1, wherein: A retaining rib (32) for preventing the liquid medium from rotating in the pump chamber is provided on the inner wall of the rear pump cover ceramic part (31).

7. The ceramic centrifugal pump according to claim 1, wherein: A cooling water interface (49) for connecting the cooling water to enter and exit the inner cavity of the mechanical seal (4) is provided on the housing (41).

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