A large clearance eccentric self-circulating mechanical seal

Abstract

The utility model discloses a large-gap eccentric self-circulating mechanical seal, comprising a shaft sleeve, a medium-end moving ring, a medium-end static ring, a mounting flange, an atmosphere-end static ring, an atmosphere-end moving ring and an inner shaft sleeve; the medium-end moving ring and the atmosphere-end moving ring are both sleeved on the upper and lower ends of the shaft sleeve, and the medium-end static ring and the atmosphere-end static ring are respectively located on the upper and lower ends of the mounting flange; the medium-end moving ring and the medium-end static ring abut against each other, and the atmosphere-end static ring and the atmosphere-end moving ring abut against each other; two symmetrically arranged sealing liquid inlet and outlet channels are also provided inside the mounting flange, and two sealing liquid inlets and outlets are symmetrically provided at the bottom of the medium-end static ring; a larger gap is left between the inner wall of the medium-end static ring and the outer wall of the shaft sleeve of the utility model, so that the flow rate of the sealing liquid during circulation is larger, and the heat dissipation effect on the mechanical seal is better.

Description

Technical Field

[0001] The utility model relates to the field of mechanical seals, in particular to a large-gap eccentric self-circulating mechanical seal. Background Art

[0002] Since the transmission shaft runs through the inside and outside of the equipment, there is a circumferential gap between the shaft and the equipment. The medium in the equipment leaks out through the gap. If the pressure inside the equipment is lower than the atmospheric pressure, the air leaks into the equipment. Therefore, there must be a shaft seal device to prevent leakage. There are many types of shaft seals. Mechanical seals have the advantages of less leakage and long life.

[0003] For example, the patent with authorization announcement number CN216768350U discloses a high-temperature and high-pressure forced self-circulating mechanical seal, including a sleeve, a first stationary ring seat and a second stationary ring seat; the right end of the sleeve is fixed to the main shaft through a shaft holder, the middle part of the sleeve is fixedly installed with a first moving ring seat by a retaining ring and screws, and the left end of the sleeve is integrally formed with a second moving ring seat; the right end of the second moving ring seat is installed with a second moving ring, a fixing pin is provided between the second moving ring seat and the second moving ring to prevent the rotation of the second moving ring, a first spring is provided between the second moving ring seat and the second moving ring, the right end of the first moving ring seat is installed with a first moving ring, and the right end of the first moving ring seat is installed with a fixing pin between the first moving ring to prevent the rotation of the first moving ring.

[0004] The above patent has a fast cooling water circulation speed and a good cooling effect on the pump, and there is no need to set up a dedicated circulation system separately; however, the disadvantage of the above patent is that generally this conical spiral pumping ring needs to be equipped with a guide sleeve to cooperate with the pumping ring to achieve a normal pumping effect, and the structure is complicated.

[0005] Therefore, it is necessary for us to improve such a structure to overcome the above-mentioned defects. Utility Model Content

[0006] The utility model aims to provide a large-clearance eccentric self-circulating mechanical seal to solve the problems raised in the above-mentioned background technology.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A large-gap eccentric self-circulating mechanical seal comprises a shaft sleeve, a medium-end moving ring, a medium-end static ring, a mounting flange, an atmosphere-end static ring, an atmosphere-end moving ring and an inner shaft sleeve; the medium-end moving ring and the atmosphere-end moving ring are both sleeved on the upper and lower ends of the shaft sleeve, and the medium-end static ring and the atmosphere-end static ring are respectively located on the upper and lower ends of the mounting flange; the medium-end moving ring and the medium-end static ring abut against each other, and the atmosphere-end static ring and the atmosphere-end moving ring abut against each other; two symmetrically arranged sealing liquid inlet and outlet channels are also provided inside the mounting flange, and at the same time, two sealing liquid inlets and outlets are symmetrically provided at the bottom of the medium-end static ring, and the sealing liquid inlet and outlet channels are correspondingly arranged with the sealing liquid inlet and outlet, and at the same time, a plurality of water-throwing grooves are provided on the outer wall of the shaft sleeve in a circular array; the inner wall of the medium-end static ring is eccentrically arranged compared with the outer wall of the shaft sleeve, wherein a gap is left between the inner wall of the medium-end static ring and the outer wall of the shaft sleeve, and the gap at the top position is larger than the gap at the bottom position; the larger gap at the top position forms a cavity that is conducive to the circulation of the sealing liquid and generates a larger self-circulating flow.

[0009] Furthermore, the medium end moving ring is made of silicon carbide, and the inner sleeve and the inner end cover are made of ceramic.

[0010] Furthermore, a medium end static ring mounting portion is provided at the top of the mounting flange, a medium end static ring is fixedly installed at the medium end static ring mounting portion, an end cover mounting groove is provided above the medium end static ring mounting portion, an inner end cover is fixedly installed in the end cover mounting groove, and the inner side of the inner end cover is sealingly connected to the medium end static ring via a first O-ring.

[0011] Furthermore, the medium end stationary ring is connected to the bottom of the medium end stationary ring mounting portion through a first pin to prevent the medium end stationary ring from rotating.

[0012] Furthermore, the medium-end moving ring is fixedly installed on the top of the sleeve, and a moving ring pressure plate is provided below the medium-end moving ring, and a retaining ring abutting against it is provided below the moving ring pressure plate, and the retaining ring is clamped in the groove of the sleeve; at the same time, a second O-ring is provided between the medium-end moving ring and the side wall of the sleeve for sealing connection with the sleeve.

[0013] Furthermore, an atmospheric end static ring mounting portion is provided at the bottom of the mounting flange, an atmospheric end static ring seat is fixedly installed in the atmospheric end static ring mounting portion by a second pin, an atmospheric end static ring is fixedly installed at the bottom of the atmospheric end static ring seat, and a third O-ring is provided between the atmospheric end static ring seat and the inner wall of the atmospheric end static ring mounting portion for sealing between the atmospheric end static ring seat and the mounting flange.

[0014] Furthermore, a dynamic ring seat is fixedly installed at the bottom of the sleeve, and the atmospheric end dynamic ring is fixedly installed on the atmospheric end dynamic ring seat. At the same time, a fourth O-ring is arranged between the atmospheric end dynamic ring and the atmospheric end dynamic ring seat for sealing connection with the atmospheric end dynamic ring seat; a fifth O-ring is arranged between the atmospheric end dynamic ring seat and the sleeve for sealing connection with the sleeve.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model has the advantages that a larger gap is left between the inner wall of the static ring at the medium end and the outer wall of the shaft sleeve, so that the flow rate of the sealing liquid during circulation is larger, and the heat dissipation effect of the mechanical seal is better;

[0017] At the same time, compared with the prior art, the medium end static ring is used to replace the guide sleeve in the prior art, and the structure is simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a large-clearance eccentric self-circulating mechanical seal.

[0019] Figure 2 This is a front view of a large-clearance eccentric self-circulating mechanical seal.

[0020] Figure 3 A side view of a large clearance eccentric self-circulating mechanical seal.

[0021] Figure 4 A top view of a large-clearance eccentric self-circulating mechanical seal.

[0022] Figure 5 for Figure 2 Sectional view along AA direction.

[0023] Figure 6 for Figure 3 Cross-sectional view along the BB axis.

[0024] Figure 7 for Figure 2 Sectional view along CC direction.

[0025] Figure 8 This is a schematic diagram of the structure of the static ring at the medium end of a large-clearance eccentric self-circulating mechanical seal.

[0026] Fig. 9 The diagram is a structural diagram of a shaft sleeve in a large-clearance eccentric self-circulating mechanical seal.

[0027] Fig.10 This is a schematic diagram of a large-clearance eccentric self-circulating mechanical seal installed on a rotating shaft. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0029] See also Figure 1-9 A large-gap eccentric self-circulating mechanical seal comprises a sleeve 100, a medium-end moving ring 200, a medium-end static ring 300, a mounting flange 400, an atmosphere-end static ring 500, an atmosphere-end moving ring 600 and an inner sleeve 700; the medium-end moving ring 200 is made of silicon carbide, and the inner sleeve 700 and the inner end cover 403 are made of ceramics;

[0030] like Fig.10 During installation, the inner sleeve 700 and the sleeve 100 are fixedly mounted on the rotating shaft 900.

[0031] The medium end moving ring 200 and the atmosphere end moving ring 600 are both sleeved on the upper and lower ends of the shaft sleeve 100, and the medium end static ring 300 and the atmosphere end static ring 500 are respectively located on the upper and lower ends of the mounting flange 400; the medium end moving ring 200 and the medium end static ring 300 are in contact with each other, and the atmosphere end static ring 500 and the atmosphere end moving ring 600 are in contact with each other;

[0032] In this solution, a medium end static ring mounting portion 401 is provided at the top of the mounting flange 400, a medium end static ring 300 is fixedly mounted at the medium end static ring mounting portion 401, an end cover mounting groove 402 is provided above the medium end static ring mounting portion 401, an inner end cover 403 is fixedly mounted in the end cover mounting groove 402, and the inner side of the inner end cover 403 is sealed and connected to the medium end static ring 300 through a first O-ring 301;

[0033] Specifically, the medium end static ring 300 is connected to the bottom of the medium end static ring mounting portion 401 through the first pin 302 to prevent the medium end static ring 300 from rotating;

[0034] In this solution, the medium end moving ring 200 is fixedly installed on the top of the sleeve 100, and a moving ring pressure plate 201 is provided below the medium end moving ring 200, and a retaining ring 202 is provided below the moving ring pressure plate 201 to abut against it, and the retaining ring 202 is clamped in the clamping groove of the sleeve 100; at the same time, a second O-ring 203 is provided between the medium end moving ring 200 and the side wall of the sleeve 100 for sealing connection with the sleeve 100.

[0035] In this solution, an atmospheric end static ring mounting portion 404 is provided at the bottom of the mounting flange 400, an atmospheric end static ring seat 501 is fixedly mounted in the atmospheric end static ring mounting portion 404 through a second pin 502, an atmospheric end static ring 500 is fixedly mounted at the bottom of the atmospheric end static ring seat 501, and a third O-ring 503 is provided between the atmospheric end static ring seat 501 and the inner wall of the atmospheric end static ring mounting portion 404 for sealing between the atmospheric end static ring seat 501 and the mounting flange 400;

[0036] In this solution, a dynamic ring seat 601 is fixedly installed at the bottom of the shaft sleeve 100, and the atmospheric end dynamic ring 600 is fixedly installed on the atmospheric end dynamic ring seat 601. At the same time, a fourth O-ring 602 is also provided between the atmospheric end dynamic ring 600 and the atmospheric end dynamic ring seat 601 for sealing connection with the atmospheric end dynamic ring seat 601; a fifth O-ring 603 is also provided between the atmospheric end dynamic ring seat 601 and the shaft sleeve 100 for sealing connection with the shaft sleeve 100;

[0037] In this solution, two symmetrically arranged sealing liquid inlet and outlet channels 405 are provided inside the mounting flange 400, and two sealing liquid inlet and outlet channels 302 are symmetrically provided at the bottom of the medium end static ring 300, and the sealing liquid inlet and outlet channels 405 are provided correspondingly to the sealing liquid inlet and outlet 302, and a plurality of water throwing grooves 101 are provided in a circular array on the outer wall of the shaft sleeve 100;

[0038] It is also worth noting that the inner wall of the medium end stationary ring 300 is eccentrically arranged compared to the outer wall of the sleeve 100. Figure 7 As shown, a gap is left between the inner wall of the static ring 300 at the medium end and the outer wall of the sleeve 100, and the gap at the top position is larger than the gap at the bottom position, and the gap is larger at the top position and smaller at the bottom position; the larger gap at the top position forms a cavity that is beneficial to the circulation of the sealing liquid and generates a larger self-circulating flow rate;

[0039] like Figure 7As shown, when the present invention is used, when the rotating shaft 900 rotates clockwise, the sealing liquid is introduced into the water-throwing tank 101 from the left sealing liquid inlet and outlet 302. As the shaft sleeve 100 rotates clockwise following the rotating shaft 900, the sealing liquid sequentially enters the larger gap at the top from the left side and then enters the right end. Since the gap is smaller at the bottom, the sealing liquid is blocked at the bottom position, and the sealing liquid is discharged from the sealing liquid inlet and outlet 302 on the right side. The sealing liquid inlet and outlet 302 are respectively connected to the external water pipe through the sealing liquid inlet and outlet channel 405 and then connected to the water tank, forming a cycle.

[0040] On the contrary, when the rotating shaft 900 rotates counterclockwise, the sealing liquid enters from the sealing liquid inlet and outlet 302 on the right side, and is discharged from the sealing liquid inlet and outlet 302 on the left side.

[0041] The water flow can not only take away most of the friction heat generated by the two sets of friction surfaces (the medium-end dynamic ring 200 and the medium-end static ring 300, the atmosphere-end static ring 500 and the atmosphere-end dynamic ring 600), but the water flow entering the mechanical seal can also fill the friction surfaces between the medium-end dynamic ring 200 and the medium-end static ring 300, thereby reducing the amount of medium entering the friction surface.

[0042] In the description of the present utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the equipment or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present utility model, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "connection" and the like should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

Claims

1. A large-gap eccentric self-circulating mechanical seal, comprising a shaft sleeve, a medium-end moving ring, a medium-end static ring, a mounting flange, an atmospheric-end static ring, an atmospheric-end moving ring and an inner shaft sleeve; characterized in that: The medium end dynamic ring and the atmosphere end dynamic ring are both sleeved on the upper and lower ends of the shaft sleeve, and the medium end static ring and the atmosphere end static ring are respectively located at the upper and lower ends of the mounting flange; the medium end dynamic ring and the medium end static ring abut against each other, and the atmosphere end static ring and the atmosphere end dynamic ring abut against each other; the interior of the mounting flange is also provided with two symmetrically arranged sealing liquid inlet and outlet channels, and at the same time, the bottom of the medium end static ring is symmetrically provided with two sealing liquid inlets and outlets, and the sealing liquid inlet and outlet channels are arranged correspondingly to the sealing liquid inlet and outlet, and at the same time, the outer wall of the shaft sleeve is provided with a plurality of water throwing grooves in a circular array; the inner wall of the medium end static ring is eccentrically arranged compared to the outer wall of the shaft sleeve, and a gap is left between the inner wall of the medium end static ring and the outer wall of the shaft sleeve, and the gap at the top position is larger than the gap at the bottom position.

2. A large clearance eccentric self-circulating mechanical seal according to claim 1, characterized in that: The medium end moving ring is made of silicon carbide, and the inner shaft sleeve and the inner end cover are made of ceramic material.

3. A large clearance eccentric self-circulating mechanical seal according to claim 1, characterized in that: A medium end static ring mounting portion is provided at the top of the mounting flange, a medium end static ring is fixedly mounted at the medium end static ring mounting portion, an end cover mounting groove is provided above the medium end static ring mounting portion, an inner end cover is fixedly mounted in the end cover mounting groove, and the inner side of the inner end cover is sealingly connected to the medium end static ring via a first O-ring.

4. A large clearance eccentric self-circulating mechanical seal according to claim 3, characterized in that: The medium end static ring is connected to the bottom of the medium end static ring mounting portion through a first pin to prevent the medium end static ring from rotating.

5. A large clearance eccentric self-circulating mechanical seal according to claim 3, characterized in that: The medium-end moving ring is fixedly installed on the top of the sleeve, and a moving ring pressure plate is provided below the medium-end moving ring, and a retaining ring abutting against the moving ring pressure plate is provided below the moving ring pressure plate, and the retaining ring is clamped in the clamping groove of the sleeve; at the same time, a second O-ring is provided between the medium-end moving ring and the side wall of the sleeve for sealing connection with the sleeve.

6. A large clearance eccentric self-circulating mechanical seal according to claim 1, characterized in that: An atmospheric end static ring mounting portion is provided at the bottom of the mounting flange, an atmospheric end static ring seat is fixedly installed in the atmospheric end static ring mounting portion by a second pin, an atmospheric end static ring is fixedly installed at the bottom of the atmospheric end static ring seat, and a third O-ring is provided between the atmospheric end static ring seat and the inner wall of the atmospheric end static ring mounting portion for sealing between the atmospheric end static ring seat and the mounting flange.

7. A large clearance eccentric self-circulating mechanical seal according to claim 6, characterized in that: A dynamic ring seat is fixedly installed at the bottom of the sleeve, and the atmospheric end dynamic ring is fixedly installed on the atmospheric end dynamic ring seat. At the same time, a fourth O-ring is arranged between the atmospheric end dynamic ring and the atmospheric end dynamic ring seat for sealing connection with the atmospheric end dynamic ring seat; a fifth O-ring is arranged between the atmospheric end dynamic ring seat and the sleeve for sealing connection with the sleeve.

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