Sealing ring structure of mechanical seal and mechanical seal

Abstract

The sealing ring structure comprises a sealing ring body, a plurality of blind grooves are formed in the inner wall of the sealing ring body in the axis direction of the sealing ring body, and the blind grooves are distributed in the inner wall of the sealing ring body in a circumferential array mode. The stress groove formed in the inner wall of the sealing ring body is the blind groove, and the two ends of the stress groove do not penetrate through the inner wall of the whole sealing ring body, so that the rejection rate of the sealing ring is low, and the sealing performance of the inner end face of the sealing ring is better.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of mechanical seals, in particular to a seal ring structure of a mechanical seal and the mechanical seal. BACKGROUND

[0002] The split mechanical seal is a mechanical seal which can be replaced without disassembling front-end components. The split mechanical seal makes the maintenance and replacement of mechanical seals of many large-scale equipment convenient and fast.

[0003] The split seal ring is an important component in the split mechanical seal. Two stress grooves parallel to the axis are symmetrically machined on the inner hole of the split seal ring during production. The current stress grooves are through design. The stress grooves leave notches on the sealing surface. The notches increase the scrap rate of the split seal ring during production and the poor sealing performance of the notch position of the sealing surface during later use.

[0004] Therefore, the inventor needs to design a new seal ring structure of a mechanical seal to overcome the above problems. SUMMARY

[0005] The main purpose of the application is to provide a seal ring structure of a mechanical seal to solve the problems of high scrap rate and poor sealing performance of the split seal ring caused by the through stress groove in the related art.

[0006] To achieve the above purpose, in a first aspect, the application provides a seal ring structure of a mechanical seal, comprising a seal ring body, a plurality of blind grooves are formed on the inner wall of the seal ring body along the axis direction of the seal ring body, and the blind grooves are distributed in a circular array on the inner wall of the seal ring body.

[0007] Optionally, the blind grooves are V-shaped grooves, and the openings of the V-shaped grooves face the central axis of the seal ring body.

[0008] Optionally, the V-shaped grooves have first arc-shaped portions at both ends.

[0009] Optionally, the V-shaped angle of the V-shaped grooves ranges from 15° to 90°.

[0010] Optionally, the blind grooves are arc-shaped grooves, and the openings of the arc-shaped grooves face the central axis of the seal ring body.

[0011] Optionally, the arc-shaped grooves have second arc-shaped portions at both ends.

[0012] Optionally, the central angle of the arc-shaped grooves ranges from 30° to 180°.

[0013] Optionally, the distance between the top of the blind groove and the top surface of the sealing ring body ranges from 1mm to 3mm, and the distance between the bottom of the blind groove and the bottom surface of the sealing ring body ranges from 1mm to 3mm.

[0014] Optionally, the sealing ring body has two blind grooves symmetrically arranged thereon.

[0015] In another aspect, the application provides a mechanical seal comprising the sealing ring structure of the mechanical seal as described above.

[0016] Compared with the prior art, the sealing ring structure of the mechanical seal and the mechanical seal have the following beneficial effects:

[0017] The stress groove formed on the inner wall of the sealing ring body is a blind groove, and the two ends of the blind groove do not penetrate the entire inner wall of the sealing ring body. This way makes the scrap rate of the sealing ring lower, and the sealing performance of the inner end surface of the sealing ring is better. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The drawings illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. In the drawings:

[0019] Figure 1 is the overall structure diagram (embodiment one) of the utility model;

[0020] Figure 2 is the V-shaped groove structure diagram (embodiment one) of the utility model;

[0021] Figure 3 is the first arched portion structure diagram (embodiment two) of the utility model;

[0022] Figure 4 is the arc-shaped groove structure diagram (embodiment three) of the utility model;

[0023] Figure 5 is the second arched portion structure diagram (embodiment four) of the utility model.

[0024] Wherein: 1, sealing ring body; 2, V-shaped groove; 3, first arched portion; 4, arc-shaped groove; 5, second arched portion. DETAILED DESCRIPTION

[0025] In the following, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort should fall into the protection scope of the present application.

[0026] It should be noted that the terms "first", "second" and the like in the description of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units does not necessarily limit to those clearly listed steps or units, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0027] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0028] In addition, in addition to indicating the orientation or positional relationship, the above-mentioned part of the terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For a person of ordinary skill in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0029] In addition, the meaning of the term "a plurality of" should be two and more than two.

[0030] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0031] Embodiment one:

[0032] As Figure 1 , 2The figure shows a sealing ring structure for a mechanical seal, comprising a sealing ring body 1. The inner wall of the sealing ring body 1 is provided with a plurality of blind grooves along the axial direction of the sealing ring body 1. The blind grooves are distributed in a circumferential array on the inner wall of the sealing ring body 1. Specifically, the stress grooves provided on the inner wall of the sealing ring body 1 are configured as blind grooves, with their ends not extending through the entire inner wall of the sealing ring body 1. This approach reduces the scrap rate of the sealing ring and improves the sealing performance of the inner end face of the sealing ring.

[0033] The blind groove is a V-shaped groove 2, the opening of which faces the central axis of the sealing ring body 1. Specifically, the V-shaped groove 2 is relatively simple to process and the processing accuracy is easy to control. At the same time, for axial force, the V-shaped groove 2 can disperse the force along the two inclined surfaces of the groove, thereby reducing local stress concentration.

[0034] The V-shaped angle of the V-shaped groove 2 ranges from 15° to 90°. Specifically, if the angle is too large, the stress dispersion effect is poor, and if the angle is too small, the stress is easily concentrated, which can easily damage the sealing ring body 1.

[0035] The distance between the top of the blind groove and the top surface of the sealing ring body 1 ranges from 1 mm to 3 mm, and the distance between the bottom of the blind groove and the bottom surface of the sealing ring body 1 ranges from 1 mm to 3 mm. Specifically, if the distance between the ends of the blind groove and the ends of the sealing ring body 1 is too large, the stress dispersion effect is poor. If the distance is too small, the blind groove is prone to cracking due to stress, which may damage the mechanical seal.

[0036] There are two blind grooves, which are symmetrically arranged on the sealing ring body 1. Specifically, generally speaking, two stress grooves can meet the stress release requirement, and in a few cases, three or more stress grooves are used.

[0037] A mechanical seal comprises the sealing ring structure of the mechanical seal as described above.

[0038] Example 2: Figure 3 As shown, the difference between this embodiment and embodiment one is that: the two ends of the V-shaped groove 2 have a first arch portion 3; specifically, the arch portion can better disperse the stress and make the two ends of the V-shaped groove 2 have better strength and are less likely to crack, but compared with embodiment one, the processing difficulty of this embodiment is higher and the cost is higher.

[0039] Example 3: Figure 4As shown, the difference between the embodiment and embodiment one is that the blind groove is an arc-shaped groove 4, and the arc-shaped groove 4 is open towards the central axis of the sealing ring body 1. Specifically, compared with the V-shaped groove 2, the arc-shaped groove 4 has no sharp corners, avoiding stress concentration points caused by the corners. This makes the sealing ring less likely to have damage such as local cracks during long-term operation, especially when subjected to dynamically changing stress. However, the machining of the arc-shaped groove 4 is relatively complex, and special tools or machining processes need to be used to ensure the accuracy of the arc shape, which is more expensive.

[0040] The central angle of the arc-shaped groove 4 ranges from 30° to 180°. Specifically, if the central angle of the arc-shaped stress groove is too small, the stress buffering effect is limited; if the central angle of the arc-shaped stress groove is too large, the overall strength of the sealing ring will be weakened.

[0041] Embodiment four: as shown in the figure, Figure 5 The difference between the embodiment and embodiment three is that the two ends of the arc-shaped groove 4 have a second arched part 5. Similar to embodiment two, the arched part can better disperse stress and make the two ends of the arc-shaped groove 4 have better strength and be less likely to crack. However, compared with embodiment one, the processing difficulty of this embodiment is higher, and the cost is higher.

[0042] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A sealing ring structure for a mechanical seal, characterized in that: The invention comprises a sealing ring body (1), wherein a plurality of blind grooves are provided on the inner wall of the sealing ring body (1) along the axial direction of the sealing ring body (1), and the blind grooves are distributed in a circumferential array on the inner wall of the sealing ring body (1).

2. A sealing ring structure for a mechanical seal according to claim 1, characterized in that: The blind groove is a V-shaped groove (2), and the opening of the V-shaped groove (2) faces the central axis of the sealing ring body (1).

3. The sealing ring structure of a mechanical seal according to claim 2, characterized in that: Both ends of the V-shaped groove (2) are provided with first arched portions (3).

4. The sealing ring structure of a mechanical seal according to claim 2, characterized in that: The V-shaped angle of the V-shaped groove (2) ranges from 15° to 90°.

5. The sealing ring structure of a mechanical seal according to claim 1, characterized in that: The blind groove is an arc-shaped groove (4), and the opening of the arc-shaped groove (4) faces the central axis of the sealing ring body (1).

6. The sealing ring structure of a mechanical seal according to claim 5, characterized in that: Both ends of the arc-shaped groove (4) are provided with second arched portions (5).

7. The sealing ring structure of a mechanical seal according to claim 5, characterized in that: The central angle of the arc-shaped groove (4) ranges from 30° to 180°.

8. The sealing ring structure of a mechanical seal according to claim 1, characterized in that: The distance between the top of the blind groove and the top surface of the sealing ring body (1) ranges from 1 mm to 3 mm, and the distance between the bottom of the blind groove and the bottom surface of the sealing ring body (1) ranges from 1 mm to 3 mm.

9. The sealing ring structure of a mechanical seal according to claim 1, characterized in that: There are two blind grooves in total, and the two blind grooves are symmetrically arranged on the sealing ring body (1).

10. A mechanical seal, characterized in that: A sealing ring structure comprising a mechanical seal according to any one of claims 1 to 9.

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