CN207879679U - Centrifugal pump mechanical sealing device of silicon carbide - Google Patents

Abstract

The utility model discloses a kind of centrifugal pump mechanical sealing device of silicon carbide, including the axle sleeve (1) being socketed on axis, the first rotating ring (2) circumferentially limited with axle sleeve (1), the first stationary ring (4) and elastic parts that are located on the first gland (3)；First stationary ring (4) is coordinated by elastic parts and the first rotating ring (2) dynamic sealing；It is characterized in that：It is further fixed on the second gland (5) on the outside of first gland (3), one group of auxiliary sealing structure is additionally provided between second gland (5) and axle sleeve (1).The device can cool down the sealing surface of rotating ring and stationary ring, the impurity for rinsing sealing surface, can guarantee normal leakproofness, has two groups of sealing structures, better tightness.

Description

Silicon carbide mechanical seal device for centrifugal pump

technical field

The utility model relates to the technical field of mechanical seals, in particular to a silicon carbide mechanical seal device for a centrifugal pump.

Background technique

At present, there is a silicon carbide mechanical seal device for centrifugal pumps, including a moving ring seat, a gland, a sealing moving ring circumferentially limited on the moving ring seat, and a sealing static ring sealingly matched with the gland. There is a gasket for circumferential and axial limitation of the static sealing ring. There is a gap between the gland and the gasket, and the gasket is radially away from the edge of the static sealing ring and the gland. There are at least two compensation components for axially limiting the gaskets connected between them. The edge of the gasket is evenly provided with a number of through holes arranged along the circumference, and the compensation assembly includes a fixing piece that passes through the through hole and is fixedly connected with the gland. The end face and the end of the fixed part are in contact with the elastic part, and the through holes are evenly distributed, so that the fixed part and the elastic part are evenly distributed on the edge of the end face of the gasket, so that the elastic part does not contact with the medium, avoiding the corrosion of the spring by the medium, and the elastic part It can stably and evenly provide compensating elastic force to the static ring through the gasket. The fixing part is fixedly connected to the gland, and the fixing part plays a role in positioning the gasket in the circumferential direction, and the middle part of the elastic part is provided with a pair of fixing parts. It limits, fixes and prevents spring deflection.

Although the mechanical seal device with the above structure is arranged on the edge of the gasket, and the edge of the gasket protrudes from the static seal ring, the compensation component is not in contact with the medium, which avoids the corrosion of the compensation component by the medium and improves the service life of the compensation component. ; and the compensation assembly not only plays a role in the extrusion of the gasket in the axial direction, but also plays a role in the circumferential positioning of the gasket, that is, the compensation assembly is fixed with the gland together with the gasket, and after the installation of the structure is completed The compensating component provides compensating elastic force to the static ring, so that the structure of the whole mechanical sealing device is more compact. But still there are following deficiencies: 1. The sealing surface of the moving ring and the static ring generates a lot of heat, and impurities are easy to accumulate on the sealing surface, thereby affecting the normal sealing performance. 2. If it is used on a special pump, the sealing mechanism of a single set of moving ring and static ring will cause the medium to leak directly if the seal fails in an accident.

Utility model content

The technical problem to be solved by the utility model is to provide a centrifugal pump that can cool the sealing surface of the dynamic ring and the static ring, wash the impurities on the sealing surface, ensure normal sealing performance, have two sets of sealing structures, and have better sealing performance. Silicon carbide mechanical seal.

The technical solution of the utility model is to provide a silicon carbide mechanical seal device for a centrifugal pump with the following structure, including a shaft sleeve sleeved on the shaft, and a first moving ring that is limited in the circumferential direction of the shaft sleeve. The first static ring and elastic assembly on a gland; the first static ring is in dynamic and sealing cooperation with the first moving ring through the elastic assembly; the outside of the first gland is also fixed with a second gland, and the first There is also a set of auxiliary sealing structures between the two glands and the shaft sleeve.

The auxiliary sealing structure includes a bellows sleeved on the shaft sleeve, a spacer at one end of the bellows, a second moving ring at the other end of the bellows, and a second static ring at the inner end of the second gland. The second moving ring and the second static ring are in dynamic sealing cooperation, the limit pad is axially limited on the shaft sleeve, and a spring is connected outside the bellows, and the two ends of the first spring are respectively connected with the groove The end face of the two steps on the outer wall of the tube.

The first gland is also provided with at least one liquid inlet and outlet distributed in the radial direction, and the cavity formed by the liquid inlet and the liquid outlet and the first gland, the second gland and the shaft sleeve In communication, the sealing surfaces of the first moving ring and the first static ring and the sealing surfaces of the second moving ring and the second static ring are in contact with the cavity.

The elastic assembly includes a gasket with a number of through holes evenly arranged along the circumference, a bolt passing through the through holes of the gasket and screwed to the first gland, and a second spring sleeved on the bolt. The two ends of the second spring abut against the end face of the washer and the end face of the bolt head respectively.

After adopting the above structure, compared with the prior art, the utility model technology has the following advantages: 1. Since the first gland is also provided with at least one liquid inlet and liquid outlet distributed along the radial direction, the inlet The liquid port and the liquid outlet communicate with the cavity formed by the first gland, the second gland and the shaft sleeve, and the sealing surfaces of the first moving ring and the first static ring and the second moving ring and the second static ring The sealing surfaces of the two sets of seals are in contact with the cavity, so that the coolant coming in from the liquid inlet can flush and cool the two sets of sealing surfaces, ensuring normal sealing. 2. Due to the addition of a group of auxiliary sealing structures, the auxiliary sealing structure can still play a certain sealing effect when the seals of the first moving ring and the first static ring fail, greatly increasing the sealing performance of the entire mechanical seal effect; and it still has a good sealing effect under large axial movement, and has good floating performance. When the shaft or cavity is deflected, it can be automatically aligned.

Description of drawings

Accompanying drawing 1 is the sectional structure schematic diagram of the silicon carbide mechanical seal device for centrifugal pump of the present utility model.

As shown in the figure:

1. Shaft sleeve, 2. First moving ring, 3. First gland, 4. First static ring, 5. Second gland, 6. Bellows, 7. Limit pad, 8. Second moving ring , 9, the second static ring, 10, the first spring, 11, the gasket, 12, the bolt, 13, the second spring.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is further described.

As shown in Figure 1, the silicon carbide mechanical seal device for a centrifugal pump of the present invention includes a shaft sleeve 1 sleeved on the shaft, a first moving ring 2 limited in the circumferential direction of the shaft sleeve 1, and a The first static ring 4 and the elastic assembly on the cover 3; the first static ring 4 is in dynamic sealing cooperation with the first moving ring 2 through the elastic assembly; Position, there is a distance between the inner wall of the first static ring 4 and the sleeve 1, and the two are not in direct contact. A second gland 5 is also fixed on the outside of the first gland 3 , and a group of auxiliary sealing structures is provided between the second gland 5 and the shaft sleeve 1 . The first gland 3, the second gland 5 and the shaft sleeve 1 form a cavity. The auxiliary sealing structure is located within the cavity.

The auxiliary sealing structure includes a bellows 6 sleeved on the shaft sleeve 1, a spacer 7 at one end of the bellows 6, a second moving ring 8 at the other end of the bellows 7, and a second gland The second static ring 9 at the inner end of the 5; the second moving ring 8 is fixed in the groove at one end of the bellows 6, and the second static ring 9 is fixed to the second gland 5 through an L-shaped pad. The second moving ring 8 and the second static ring 9 are in dynamic sealing cooperation, the limit pad 7 is axially limited on the sleeve 1, the bellows 7 is externally connected with a first spring 10, and the first The two ends of the spring 10 are respectively connected to the end faces of the two steps on the outer wall of the bellows 7 .

The first gland 3 is also provided with at least one liquid inlet and outlet distributed in the radial direction, and the liquid inlet and outlet are connected with the first gland 3, the second gland 5 and the shaft sleeve 1 The formed cavity communicates, and the sealing surfaces of the first moving ring 2 and the first static ring 4 and the sealing surfaces of the second moving ring 8 and the second static ring 9 are in contact with the cavity. Simultaneously, the first spring 10 and the second spring 13 can also be flushed by the coolant to avoid failure.

The elastic assembly includes a gasket 11 uniformly provided with a plurality of circumferentially arranged through-holes on the edge, a bolt 12 threaded through the through-holes of the gasket 11 and the first gland 3 , and a second socket sleeved on the bolt 12 . Two springs 13, the two ends of the second spring 13 respectively abut against the end face of the washer 5 and the end face of the head of the bolt 12. The inner end of the gasket 5 is bent and embedded in the groove of the first stationary ring 4 .

Claims (2)

1. a kind of centrifugal pump mechanical sealing device of silicon carbide, including the axle sleeve (1) and axle sleeve (1) that are socketed on axis circumferentially limit The first rotating ring (2) of position, the first stationary ring (4) and elastic parts being located on the first gland (3)；First stationary ring (4) passes through Elastic parts and the first rotating ring (2) dynamic sealing coordinate；It is characterized in that：It is further fixed on second on the outside of first gland (3) Gland (5) is additionally provided with one group of auxiliary sealing structure between second gland (5) and axle sleeve (1)；The auxiliary sealing structure packet It includes the bellows (6) being socketed on axle sleeve (1), the limit pad (7) for being located at bellows (6) one end, be located at bellows (6) other end The second rotating ring (8), be located at second stationary ring (9) of the second gland (5) inner end；Second rotating ring (8) is dynamic with the second stationary ring (9) Sealing cooperation, the limit pad (7) axial limiting on axle sleeve (1), a spring (10), institute are socketed with outside the bellows (6) End face of the both ends of a spring (10) respectively with two steps of bellows (6) outer wall is stated to offset；On first gland (3) also Equipped with radially distributed at least one inlet and liquid outlet, the inlet and liquid outlet and the first gland (3), the second gland (5) cavity formed with axle sleeve (1) is connected to, the sealing surface and the second rotating ring with the first rotating ring (2) and the first stationary ring (4) (8) it is in contact with cavity with the sealing surface of the second stationary ring (9).

2. centrifugal pump mechanical sealing device of silicon carbide according to claim 1, it is characterised in that：The elastic parts packet Edge is included to be uniformly provided with the gasket (11) of several through-holes circumferentially arranged, pass through the through-hole and the first gland (3) of gasket (11) The bolt (12) of threaded connection and the second spring (13) being socketed on bolt (12), the both ends difference of the second spring (13) It offsets with the end face of gasket (11) end face and bolt (12) head.