Sand-proof mechanical seal

Abstract

The utility model discloses a mechanical seal capable of preventing sand, which belongs to the technical field of mechanical seals, and is characterized in that the mechanical seal comprises a static ring, a moving ring, a cover body and a spring, an annular flange I is arranged in the static ring, a sealing surface I is arranged at the end part of the annular flange I, one end of the moving ring is movably arranged in the static ring, and a sealing surface II is arranged at the end part of the moving ring. The first sealing face is attached to the second sealing face, a second annular flange is arranged on the outer side wall of the movable ring, the outer side wall of the second annular flange is attached to the inner side wall of the static ring, the cover body and the movable ring are matched to extrude the spring, and the mechanical seal can prevent external sand and other impurities from entering the position between the first sealing face and the second sealing face to abrade the first sealing face and the second sealing face. And the sealing performance is further influenced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mechanical seal technical field, and particularly relates to a sandproof mechanical seal. BACKGROUND

[0002] Mechanical seal refers to the device that prevents fluid leakage by at least one pair of end faces perpendicular to the rotation axis under the action of fluid pressure and compensation mechanism elastic force or magnetic force and the cooperation of auxiliary seal.

[0003] The Chinese patent with publication number CN221257655U discloses a simple structure, low cost and high sealing mechanical seal, belonging to the technical field of mechanical seal, which solves the problem that the existing sealing performance cannot meet the corresponding requirements and the mechanical seal structure is complex and assembly is cumbersome, comprising a dynamic ring assembly composed of a bellows and a dynamic ring, the bellows has a clamping portion protruding from both ends, a plurality of tooth rings are sleeved on the clamping portion and are in staggered engagement, a compression spring is arranged outside the clamping portion, the compression spring is arranged in the tooth rings at both ends, the dynamic ring assembly is provided with a matched static ring assembly, the static ring assembly is composed of a static ring and a static ring sleeve, a dynamic ring is arranged in one end of the clamping portion, and the dynamic ring and the static ring are in mutual contact.

[0004] The above technical solution has the following defects: the contact surface of the dynamic ring and the static ring is easy to be worn due to the entry of sand and other impurities, thereby reducing the sealing performance. UTILITY MODEL CONTENTS

[0005] The utility model aims at the above problems existing in the prior art, and provides a sandproof mechanical seal, and the technical problem to be solved by the utility model is how to prevent sand and other impurities from entering to cause wear of the sealing surface.

[0006] The above technical purpose of the utility model can be realized by the following technical solution: a sandproof mechanical seal, comprising a static ring, a dynamic ring, a cover body and a spring, the static ring has an annular flange one inside, the annular flange one is provided with a sealing surface one at the end, one end of the dynamic ring is movably arranged in the static ring, the end of the dynamic ring is provided with a sealing surface two, the sealing surface one and the sealing surface two are in contact, the outer side wall of the dynamic ring has an annular flange two, the outer side wall of the annular flange two is in contact with the inner side wall of the static ring, and the cover body and the dynamic ring cooperate to extrude the spring.

[0007] In the above sandproof mechanical seal, the inner side wall of the dynamic ring has an annular flange three, a sealing ring is arranged on the annular flange three, and a gasket is arranged on the sealing ring.

[0008] One end of the spring is arranged in the dynamic ring and abuts against the gasket, and the other end of the spring abuts against the cover.

[0009] In the sand-proof mechanical seal, a positioning groove is arranged on the side wall of the dynamic ring, and the end of the spring is provided with a positioning part which is inserted into the positioning groove.

[0010] In the sand-proof mechanical seal, the upper end surface of the annular flange two is flush with the upper end surface of the static ring.

[0011] In the sand-proof mechanical seal, a gap one exists between the lower end surface of the annular flange two and the sealing surface one.

[0012] In the sand-proof mechanical seal, a gap two exists between the lower end surface of the annular flange three and the sealing surface one.

[0013] In the sand-proof mechanical seal, the end of the cover abuts against the upper end surface of the static ring.

[0014] Compared with the prior art, the sand-proof mechanical seal has the following beneficial effects:

[0015] The sealing surface one is arranged at the end of the annular flange one, the annular flange one is arranged in the static ring, one end of the dynamic ring is movably arranged in the static ring, the sealing surface two is arranged at the end of the dynamic ring and abuts against the sealing surface one, the outer side wall of the dynamic ring is provided with the annular flange two, and the outer side wall of the annular flange two abuts against the inner side wall of the static ring, so as to block the external sand and impurities from entering between the sealing surface one and the sealing surface two and causing wear of the two, thereby affecting the sealing performance. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a sectional view of the embodiment;

[0017] Fig. 2 It is a structural schematic view of the embodiment;

[0018] Fig. 3 It is an explosion view of the embodiment.

[0019] Mark: 1, static ring; 2, dynamic ring; 3, cover; 4, spring; 5, annular flange one; 6, sealing surface one; 7, sealing surface two; 8, annular flange two; 9, annular flange three; 10, sealing ring; 11, gasket; 12, positioning groove; 13, positioning part; 14, gap one; 15, gap two. DETAILED DESCRIPTION

[0020] The utility model discloses a specific embodiment as follows and further describes the technical scheme of the utility model in connection with the drawings, but the utility model is not limited to these embodiments.

[0021] A sandproof mechanical seal, as shown in the figure, comprises a static ring 1, a dynamic ring 2, a cover 3 and a spring 4. Figs. 1 to 3

[0022] The static ring 1 is internally provided with an annular flange 5, which is integrally formed with the static ring 1, and the upper end of the annular flange 5 is provided with a sealing surface 6.

[0023] The dynamic ring 2 is movably arranged in the static ring 1, and the lower end of the dynamic ring 2 is provided with a sealing surface 7, which is in abutment with the sealing surface 6, and the sealing surface 6 and the sealing surface 7 form a seal in cooperation.

[0024] It should be noted that the sealing surface 6 is arranged at the end of the annular flange 5, and the annular flange 5 is located in the static ring 1, so the annular flange 5 and the static ring 1 can effectively prevent external sand and other impurities from entering between the sealing surface 6 and the sealing surface 7.

[0025] Further, the outer wall of the dynamic ring 2 is provided with an annular flange 8, which is integrally formed with the dynamic ring 2, and the outer wall of the annular flange 8 is in abutment with the inner wall of the static ring 1, and the two form a barrier in cooperation, thereby preventing external sand and other impurities from passing between the two and entering between the sealing surface 6 and the sealing surface 7, avoiding wear of the sealing surface 6 and the sealing surface 7 caused by sand and other impurities, and further affecting the sealing performance, so as to effectively ensure the service life of the mechanical seal.

[0026] There is a gap 14 between the lower end surface of the annular flange 8 and the sealing surface 6, so as to avoid direct contact between the lower end surface of the annular flange 8 and the sealing surface 6, thereby avoiding wear of the sealing surface 6.

[0027] The upper end surface of the annular flange 8 is flush with the upper end surface of the static ring 1, so as to effectively prevent external sand and other impurities from entering between the annular flange 8 and the static ring 1, and further prevent external sand and other impurities from passing between the two.

[0028] The cover 3 is sleeved on the outside of the spring 4, and the cover 3 and the dynamic ring 2 can extrude the spring 4, and the spring 4 is elastically deformed to compensate for the displacement of the dynamic ring 2, so as to ensure that the sealing surface 6 and the sealing surface 7 are in abutment and maintain the effectiveness of the seal.

[0029] ​Further, in order to avoid rotation of the spring 4, a positioning groove 12 is formed on the side wall of the moving ring 2, and the end of the spring 4 is provided with a positioning portion 13 which is integrally formed with the spring 4, the positioning portion 13 is inserted into the positioning groove 12, and the positioning groove 12 limits the positioning portion 13, thereby achieving circumferential limitation of the spring 4, ensuring the stability of the spring 4, and ensuring the stability and reliability of the overall structure.

[0030] The inner side wall of the moving ring 2 is provided with an annular flange three 9 which is integrally formed with the moving ring 2, and the annular flange three 9 is placed with a sealing ring 10, and the annular flange three 9 supports the sealing ring 10, thereby ensuring the stability of the position of the sealing ring 10 in the moving ring 2, and further ensuring the effective sealing of the sealing ring 10 to the external shaft body.

[0031] The sealing ring 10 is placed with a gasket 11, preferably, the gasket 11 is made of metal material, thereby ensuring the structural strength, the sealing ring 10 abuts against the gasket 11, one end of the spring 4 is arranged in the moving ring 2 and abuts against the gasket 11, the other end of the spring 4 abuts against the cover body 3, and through the action of the gasket 11, the spring 4 is avoided from directly contacting the sealing ring 10, thereby avoiding abrasion of the sealing ring 10.

[0032] There is a gap two 15 between the lower end surface of the annular flange three 9 and the sealing surface one 6, thereby avoiding direct contact between the lower end surface of the annular flange three 9 and the sealing surface one 6, thereby effectively avoiding abrasion of the sealing surface one 6.

[0033] The end of the cover body 3 abuts against the upper end surface of the static ring 1, thereby ensuring the relative stability of the positions of the cover body 3 and the static ring 1.

[0034] The assembly principle is as follows:

[0035] First, one end of the moving ring 2 is inserted into the static ring 1 until the sealing surface one 6 abuts against the sealing surface two 7, then the sealing ring 10 is placed into the moving ring 2 until the sealing ring 10 abuts against the upper end surface of the annular flange three 9, then the gasket 11 is placed into the moving ring 2 until the gasket 11 abuts against the sealing ring 10, then the positioning portion 13 on the spring 4 is aligned with the positioning groove 12 on the moving ring 2, then one end of the spring 4 is inserted into the moving ring 2 until the end of the spring 4 abuts against the gasket 11, and finally the cover body 3 is sleeved on the outside of the spring 4.

[0036] The specific embodiments described in the present document are only illustrative of the spirit of the present application; those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A sand-preventable mechanical seal characterized by comprising: The utility model relates to a sealing device, including static ring (1), dynamic ring (2), cover (3) and spring (4), the static ring (1) has annular flange one (5) in, the end of annular flange one (5) is provided with sealing surface one (6), one end of dynamic ring (2) is movably arranged in static ring (1), the end of dynamic ring (2) is provided with sealing surface two (7), sealing surface one (6) and sealing surface two (7) are attached, the outside wall of dynamic ring (2) has annular flange two (8), the outside wall of annular flange two (8) and the inside wall of static ring (1) are attached, and cover (3) is extruded spring (4) with dynamic ring (2) cooperation.

2. A sand-tight mechanical seal according to claim 1, characterized in that: The inside wall of dynamic ring (2) has annular flange three (9), and sealing ring (10) is placed on annular flange three (9), and washer (11) is placed on sealing ring (10).

3. A sand-tight mechanical seal according to claim 2, wherein: One end of spring (4) is arranged in dynamic ring (2) and abuts against washer (11), and the other end of spring (4) abuts against cover (3).

4. A sand-tight mechanical seal according to claim 1, wherein: The side wall of dynamic ring (2) is provided with positioning groove (12), and the end of spring (4) has positioning part (13), and positioning part (13) is inserted into positioning groove (12).

5. A sand-tight mechanical seal according to claim 1, wherein: The upper end surface of annular flange two (8) is flush with the upper end surface of static ring (1).

6. A sand-tight mechanical seal according to claim 1, wherein: There is gap one (14) between the lower end surface of annular flange two (8) and sealing surface one (6).

7. A sand exclusionary mechanical seal in accordance with claim 2 wherein: There is gap two (15) between the lower end surface of annular flange three (9) and sealing surface one (6).

8. A sand-tight mechanical seal according to claim 1, wherein: The end of cover (3) abuts against the upper end surface of static ring (1).

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