Two-stage conical surface-end surface series contact type mechanical sealing device for sewage pump

A technology of mechanical sealing device and sewage pump, which is applied in the direction of engine sealing, mechanical equipment, engine components, etc., can solve the problems that the sealing medium cannot be effectively prevented from leaking, and the sealing reliability is not satisfactory, so as to improve safety and stability , Reduce leakage, good heat dissipation effect

Inactive Publication Date: 2021-01-01

ZHEJIANG UNIV OF TECH

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Problems solved by technology

However, in practical engineering applications, it is often impossible to effectively prevent the leakage of the sealed medium due to many reasons, especially the failure of the blocking fluid a...

Abstract

The invention provides a two-stage conical surface-end surface series contact type mechanical sealing device for a sewage pump, and belongs to the technical field of liquid mechanical sealing devices.The two-stage conical surface-end surface series contact type mechanical sealing device comprises a rotating shaft, wherein a shaft sleeve is arranged on the outer side of the rotating shaft in a sleeving mode, a main sealing assembly body and a secondary sealing assembly body are arranged on the outer side of the shaft sleeve in a series connection and sleeving mode, and a main sealing side gland and a secondary sealing side gland are correspondingly arranged on the outer sides of the main sealing assembly body and the secondary sealing assembly body correspondingly; and a sealing device fixing body is arranged on one side of the main sealing side gland, the other side of the main sealing side gland is matched with the secondary sealing side gland, and the main sealing side gland, the sealing device fixing body and the sealing side gland are connected and fixed to form a whole. According to the two-stage conical surface-end surface series contact type mechanical sealing device, a main sealing movable ring and a main sealing static ring are in conical surface sealing fit, so that the adhesion wear degree of suspended solid particles in a medium is reduced; and in addition, a secondary sealing push ring and a secondary sealing static ring are in end surface sealing fit, so that series two-stage sealing is formed, the leakage amount is effectively reduced, and the sealing safetyand stability are improved.

Application Domain

Engine seals

Technology Topic

Rotational axisSewage +2

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Experimental program(1)

Example Embodiment

[0024]In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the drawings and embodiments of the specification. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0025]On the contrary, the present invention covers any alternatives, modifications, equivalent methods and schemes defined by the claims in the spirit and scope of the present invention. Further, in order to enable the public to have a better understanding of the present invention, in the following detailed description of the present invention, some specific details are described in detail. Those skilled in the art can fully understand the present invention without the description of these details.

[0026]SeeFigure 1-5, A two-stage taper-end surface series contact mechanical seal device for sewage pumps, including a rotating shaft. The outer side of the rotating shaft is fixedly installed with a shaft sleeve 1 through a fixing part 11. The fixing part 11 generally uses a set screw, a set screw An end cover retaining ring 10 is installed at the outer end.

[0027]The outer side of the shaft sleeve 1 is tightly sleeved in series with the primary seal assembly 2 and the secondary seal side gland 7, and the main seal assembly 2, the secondary seal side gland 7 are correspondingly provided with the primary seal side gland 5 and the secondary seal side The gland 7, the primary seal side gland 5 and the secondary seal side gland 7 are fixedly installed on the sealing device fixing body by connecting screws 8. The three parts form a fixed whole. The sealing device fixing body and the main sealing side gland 5 O-rings are provided between the primary sealing side gland 5 and the secondary sealing side gland 7.

[0028]Such asfigure 2 As shown, the main seal assembly 2 is sequentially provided with a main seal spring seat 21, a main seal push ring 23, a main seal dynamic ring 25, and a main seal static ring 26 along the axial direction of the rotating shaft. The main seal spring seat 21 and the main seal A main cylindrical compression spring 22 is provided between the push rings 23, and a conical surface seal fit is provided between the main seal dynamic ring 25 and the main seal static ring 26. The main seal static ring 26 and the main seal side gland 5 are positioned by the positioning pin 4 In connection, O-rings are provided between the main seal push ring 23 and the main seal dynamic ring 25, and between the main seal static ring 26 and the main seal side gland 5.

[0029]Such asFigure 4 As shown, the secondary seal assembly 6 is sequentially provided with a secondary seal spring seat 61, a secondary seal push ring 63, a secondary seal movable ring 65, and a secondary seal static ring 66 along the axial direction of the rotating shaft, a secondary seal spring seat 61 and a secondary seal A secondary cylindrical compression spring 62 is provided between the push ring 63, a secondary end face seal fit is provided between the secondary sealing dynamic ring 65 and the secondary static sealing ring 66, and the secondary sealing static ring 66 and the secondary sealing side gland 7 pass through the positioning pin 4 For positioning and connection, O-shaped sealing rings are provided between the secondary sealing push ring 63 and the secondary sealing dynamic ring 65, and between the secondary sealing static ring 66 and the secondary sealing side gland 7.

[0030]In the initial stage, the conical face seal and secondary end face seal structure in series, the main seal ring 25 rotating with the rotating shaft and the main seal static ring 26 not rotating with the rotating shaft generate proper pressing force on the contact end faces, and the secondary The contact end surface of the sealing movable ring 65 and the secondary sealing static ring 66 that does not rotate with the rotating shaft generates an appropriate pressing force to make the two contact end surfaces closely fit, because the tandem seal has lower leakage than the single-stage seal To achieve the purpose of sealing, a very thin liquid film is maintained between the end faces to achieve the purpose of sealing.

[0031]The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included in the protection of the present invention. Within range.

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Classification and recommendation of technical efficacy words

Good heat dissipation

Two-stage conical surface-end surface series contact type mechanical sealing device for sewage pump

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Example Embodiment

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Description & Claims & Application Information

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