CN112065998A

CN112065998A - Mechanical sealing structure for measuring leakage quantity

Info

Publication number: CN112065998A
Application number: CN202010947497.3A
Authority: CN
Inventors: 彭旭东; 金杰; 孟祥铠; 赵文静
Original assignee: Zhejiang University of Technology ZJUT
Current assignee: Zhejiang University of Technology ZJUT
Priority date: 2020-09-10
Filing date: 2020-09-10
Publication date: 2020-12-11
Anticipated expiration: 2040-09-10

Abstract

A mechanical sealing structure for measuring leakage quantity comprises a sealing cavity, wherein a gland is arranged at the top end of the sealing cavity, a sealing cavity is formed between the sealing cavity and the gland, a sealing end face formed by matching a static ring and a moving ring, a leakage collecting cavity and a shaft sleeve are arranged in the sealing cavity, the leakage collecting cavity is arranged on the upper side of the sealing end face, and the shaft sleeve is arranged on the lower side of the sealing end face; the leakage collecting cavity is communicated with a leakage collector through a liquid conveying pipe, and the leakage collector is vertically arranged; the leakage collecting cavity and the infusion tube are filled with sealed medium, and a displacement sensor is arranged in the leakage collector; when the sealing end face leaks, leaked sealed medium enters the leakage collecting cavity from the sealing end face, the sealed medium in the leakage collecting cavity overflows to the leakage collector through the liquid conveying pipe, the displacement sensor detects the liquid level change in the leakage collector, and the liquid level change is the leakage amount of the sealing end face. The invention can accurately obtain the sealing leakage amount in real time and provide a powerful basis for judging the sealing performance of the mechanical seal.

Description

Mechanical sealing structure for measuring leakage quantity

Technical Field

The invention relates to the field of liquid mechanical seal structure design, in particular to a mechanical seal structure for measuring leakage quantity.

Background

The mechanical seal is used as a rotary transmission part seal and is commonly used for pumps, kettles, compressors, hydraulic transmission and other similar equipment. The mechanical seal requires a high flatness position of 0.0009mm for processing a sealing end face, and the surface roughness requires: the Ra of the hard ring is less than or equal to 0.1 μm, and the Ra of the soft ring is less than or equal to 0.2 μm. In order for the sealing end piece to retain a lubricating film of a certain thickness, the pressing force per unit area on the sealing end face must be strictly controlled. If the unit pressure on the end face is too large, a stable lubricating film is not easy to form between the end faces, and the abrasion of the end faces can be accelerated; if the unit pressure on the end face is too small, the film thickness between the end faces becomes too large, resulting in an excessively large leakage amount. A satisfactory mechanical seal requires both a long service life and good sealing properties.

The leakage amount is used as an index for measuring the sealing performance of the mechanical seal, and has important significance for accurate measurement of the mechanical seal. Chinese patent cn201610007336.x proposes a method for online monitoring of leakage rate, but does not relate to a specific mechanical seal structure, and the patent mainly focuses on monitoring whether leakage exceeds standard and gives a corresponding prompt.

Disclosure of Invention

To overcome the above problems, the present invention provides a mechanical seal structure for leakage amount measurement.

The technical scheme adopted by the invention is as follows: a mechanical sealing structure for measuring leakage quantity comprises a sealing cavity with an opening at the upper end, a gland which is covered with the opening of the sealing cavity is arranged at the upper end of the sealing cavity, a sealing cavity is formed between the sealing cavity and the gland, a sealing end face formed by matching a static ring and a moving ring, a leakage collecting cavity and a shaft sleeve are arranged in the sealing cavity, the leakage collecting cavity is arranged on the upper side of the sealing end face, and the shaft sleeve is arranged on the lower side of the sealing end face;

the static ring is arranged on the static ring seat, and the static ring seat is arranged on the pressure cover; an inner O-shaped ring and an outer O-shaped ring are arranged between the static ring seat and the gland, wherein the inner O-shaped ring is positioned on the inner circumference of the static ring seat, and the outer O-shaped ring is positioned on the outer circumference of the static ring seat; a spring seat is arranged on the shaft sleeve, a spring, a push ring and a movable ring are sequentially arranged above the spring seat, and a movable ring O-shaped ring is arranged between the movable ring and the shaft sleeve;

the gland, the static ring seat, the inner O-shaped ring, the static ring, the movable ring O-shaped ring and the shaft sleeve form a closed leakage collecting cavity in a surrounding mode, the leakage collecting cavity is communicated with the leakage collector through a liquid conveying pipe, the liquid conveying pipe is arranged in an inverted L shape, and the leakage collector is vertically arranged; the leakage collecting cavity and the infusion tube are filled with sealed media, a certain amount of sealed media is injected into the leakage collector, and a displacement sensor is arranged in the leakage collector;

when the sealing end face leaks, leaked sealed medium enters the leakage collecting cavity from the sealing end face, the sealed medium in the leakage collecting cavity overflows to the leakage collector through the liquid conveying pipe, the displacement sensor detects the liquid level change in the leakage collector, and the liquid level change is the leakage amount of the sealing end face.

Further, the leakage collector is a cylindrical structure with an inner cavity, and the inner diameter of the leakage collector is larger than that of the displacement sensor.

Furthermore, the outer wall surface of the sealed cavity is provided with a pipe clamp seat, and a pipe clamp used for installing a leakage collector is arranged on the pipe clamp seat.

Further, the spring seat is mounted on the shaft sleeve through a set screw.

The invention has the beneficial effects that: the sealing leakage amount can be accurately obtained in real time in the operation process of the mechanical seal, and powerful basis can be provided for judging the sealing performance of the mechanical seal.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Description of reference numerals: 1. a stationary ring; 2. a stationary ring seat; 3. an outer O-ring; 4. an inner O-shaped ring; 5. a gland; 6. a leakage collecting cavity; 7. a transfusion tube; 8. a displacement sensor; 9. a leakage collector; 10. a pipe clamp; 11. a tube holder; 12. a push ring; 13. a spring; 14. a spring seat; 15. a shaft sleeve; 16. a moving ring O-shaped ring; 17. a moving ring; 18. and sealing the cavity.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the orientations or positional relationships indicated as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., appear based on the orientations or positional relationships shown in the drawings only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to the attached drawings, the mechanical sealing structure for measuring the leakage quantity comprises a sealing cavity 18 with an opening at the upper end, a gland 5 which is covered with the opening of the sealing cavity 18 is arranged at the upper end of the sealing cavity 18, a sealing cavity is formed between the sealing cavity 18 and the gland 5, a sealing end face formed by matching a static ring 1 and a moving ring 17, a leakage collecting cavity 6 and a shaft sleeve 15 are arranged in the sealing cavity, the leakage collecting cavity 6 is arranged on the upper side of the sealing end face, and the shaft sleeve 15 is arranged on the lower side of the sealing end face;

the static ring 1 is arranged on the static ring seat 2, and the static ring seat 2 is arranged on the gland 5; an inner O-shaped ring 4 and an outer O-shaped ring 3 are arranged between the static ring seat 2 and the gland 5, wherein the inner O-shaped ring 4 is positioned on the inner circumference of the static ring seat 2, and the outer O-shaped ring 3 is positioned on the outer circumference of the static ring seat 2; a spring seat 14 is arranged on the shaft sleeve 15 through a set screw, a spring 13, a push ring 12 and a movable ring 17 are sequentially arranged above the spring seat 14, and a movable ring O-shaped ring 16 is arranged between the movable ring 17 and the shaft sleeve 15;

the gland 5, the static ring seat 2, the inner O-shaped ring 4, the static ring 1, the movable ring 17, the movable ring O-shaped ring 16 and the shaft sleeve 15 form a closed leakage collecting cavity 6 in a surrounding mode, the leakage collecting cavity 6 is communicated with the leakage collector 9 through the infusion tube 7, the infusion tube 7 is arranged in an inverted L shape, and the leakage collector 9 is arranged vertically; the leakage collector 9 is a cylindrical structure with an inner cavity, the inner diameter of the leakage collector 9 can be adjusted according to the accuracy of the measured leakage, and the inner diameter of the leakage collector 9 is larger than the diameter of the displacement sensor 8. The outer wall surface of the sealed cavity 18 is provided with a pipe clamp seat 11, and a pipe clamp 10 for mounting a leakage collector 9 is arranged on the pipe clamp seat 11; the leakage collecting cavity 6 and the infusion tube 7 are filled with sealed media, a certain amount of sealed media is filled into the leakage collector 9, and a displacement sensor 8 is arranged in the leakage collector 9; when the sealing end surface leaks, the leaked sealed medium enters the leakage collecting cavity 6 from the sealing end surface, the sealed medium in the leakage collecting cavity 6 overflows to the leakage collector 9 through the liquid conveying pipe 7, the displacement sensor 8 detects the liquid level change in the leakage collector 9, and the liquid level change is the leakage amount of the sealing end surface.

The specific working principle is as follows: the gland, the static ring seat, the inner O-shaped ring, the static ring, the movable ring O-shaped ring and the shaft sleeve form a closed leakage collecting cavity in a surrounding mode. The leakage collecting cavity and the leakage collector are connected by a liquid conveying pipe. And a displacement sensor is arranged in the leakage collector. Before the mechanical sealing works, the leakage collecting cavity needs to be filled with a sealed medium, a certain amount of sealed medium needs to be filled in the leakage collector in advance, and the infusion tube can be completely submerged. After the mechanical seal starts working, if leakage occurs between the sealing end faces, leaked liquid enters the leakage collecting cavity, the liquid level in the leakage collector changes at the moment, the reading on the displacement sensor changes along with the change, and the change of the reading of the displacement sensor is the leakage generated between the sealing end faces.

The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but rather by the equivalents thereof as may occur to those skilled in the art upon consideration of the present inventive concept.

Claims

1. The utility model provides a mechanical seal structure for leakage measurement, includes upper end open-ended seal chamber (18), the upper end of seal chamber (18) is equipped with gland (5) that close with seal chamber (18) opening lid, forms the seal chamber between seal chamber (18) and gland (5), its characterized in that: a sealing end face formed by matching the static ring (1) with the dynamic ring (17), a leakage collecting cavity (6) and a shaft sleeve (15) are arranged in the sealing cavity, the leakage collecting cavity (6) is arranged on the upper side of the sealing end face, and the shaft sleeve (15) is arranged on the lower side of the sealing end face;

the static ring (1) is arranged on the static ring seat (2), and the static ring seat (2) is arranged on the gland (5); an inner O-shaped ring (4) and an outer O-shaped ring (3) are arranged between the static ring seat (2) and the gland (5), wherein the inner O-shaped ring (4) is positioned on the inner circumference of the static ring seat (2), and the outer O-shaped ring (3) is positioned on the outer circumference of the static ring seat (2); a spring seat (14) is arranged on the shaft sleeve (15), a spring (13), a push ring (12) and a movable ring (17) are sequentially arranged above the spring seat (14), and a movable ring O-shaped ring (16) is arranged between the movable ring (17) and the shaft sleeve (15);

the gland (5), the static ring seat (2), the inner O-shaped ring (4), the static ring (1), the movable ring (17), the movable ring O-shaped ring (16) and the shaft sleeve (15) are enclosed to form a closed leakage collecting cavity (6), the leakage collecting cavity (6) is communicated with the leakage collector (9) through a liquid conveying pipe (7), the liquid conveying pipe (7) is arranged in an inverted L shape, and the leakage collector (9) is vertically arranged; the leakage collecting cavity (6) and the infusion tube (7) are filled with sealed medium, a certain amount of sealed medium is injected into the leakage collector (9), and a displacement sensor (8) is arranged in the leakage collector (9);

when the sealing end face leaks, leaked sealed medium enters the leakage collecting cavity (6) from the sealing end face, the sealed medium in the leakage collecting cavity (6) overflows to the leakage collector (9) through the infusion tube (7), the displacement sensor (8) detects the liquid level change in the leakage collector (9), and the liquid level change is the leakage amount of the sealing end face.

2. A mechanical seal for leak measurement as defined in claim 1, wherein: the leakage collector (9) is of a cylindrical structure with an inner cavity, and the inner diameter of the leakage collector (9) is larger than the diameter of the displacement sensor (8).

3. A mechanical seal for leak measurement as defined in claim 1, wherein: the outer wall surface of the sealed cavity (18) is provided with a pipe clamp seat (11), and the pipe clamp seat (11) is provided with a pipe clamp (10) for installing a leakage collector (9).

4. A mechanical seal for leak measurement as defined in claim 1, wherein: the spring seat (14) is arranged on the shaft sleeve (15) through a set screw.