High-pressure mechanical sealing structure

Abstract

The utility model discloses a high-pressure mechanical sealing structure which comprises a shaft sleeve, a moving ring assembly, a static ring assembly, a gland and a counter-rotating sealing assembly, the shaft sleeve is sleeved on a rotating shaft, the moving ring assembly and the static ring assembly are arranged on the shaft sleeve in a matched and overlapped mode, the gland is arranged on the static ring assembly, and the counter-rotating sealing assembly is arranged on the shaft sleeve. A gap is formed between the rear end of the gland and the shaft sleeve and used for installing the counter-rotating sealing assembly, the counter-rotating sealing assembly is pressed through the pressing plate, the counter-rotating sealing assembly is arranged to serve as mechanical sealing, higher sealing pressure can be borne, the good sealing performance is still kept when the pressure ranges from 6 Mpa to 7 Mpa, and the sealing structure is suitable for sealing in the high-temperature and high-pressure operation environment. Compared with the prior art, the counter-rotating sealing assembly has good sealing performance on a mixture of oil and / or water, when sealing fails, the counter-rotating sealing assembly can guarantee that materials cannot be directly sprayed out, the possibility that operators are injured is greatly reduced, and in other words, after dry gas sealing fails, mechanical sealing can still play a remedy role.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical seal technology, specifically relating to a high-pressure mechanical seal structure. Background Technology

[0002] In high-temperature and high-pressure environments, the use of rotating parts presents a sealing problem. Dry gas seals can provide a good seal, but their sealing performance changes with component wear, lubrication, and changes in the internal conditions of the equipment during use. If maintenance is not timely or other unexpected situations occur, the seal may fail. After the seal fails, the high-temperature and high-pressure material inside will be ejected, causing serious damage to nearby operators. Therefore, a secondary safety structure for dry gas seals needs to be designed to enhance the sealing performance and provide a remedy after the dry gas seal fails. Utility Model Content

[0003] To overcome the aforementioned shortcomings, the inventors of this utility model, through long-term exploration, experimentation, and continuous reform and innovation, have proposed a high-pressure mechanical seal structure. This structure incorporates a counter-rotating sealing assembly as the mechanical seal, enabling it to withstand higher sealing pressures. Even at 6-7 MPa, the seal maintains good sealing performance, making it suitable for high-temperature and high-pressure operating environments. It provides excellent sealing performance for mixtures of oil and / or water. In the event of seal failure, the counter-rotating sealing assembly ensures that material will not be directly ejected, significantly reducing the possibility of injury to operators. In other words, the mechanical seal can still play a remedial role even after the dry gas seal fails.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a high-pressure mechanical seal structure. It includes a bushing, a rotating ring assembly, a stationary ring assembly, a gland, and a counter-rotating seal assembly. The bushing is fitted onto a rotating shaft. The rotating ring assembly and the stationary ring assembly are fitted and stacked on the bushing. A gland is installed on the stationary ring assembly. A gap is provided between the rear end of the gland and the bushing for installing the counter-rotating seal assembly. The counter-rotating seal assembly is pressed together by a pressure plate.

[0005] A further preferred embodiment of the high-pressure mechanical seal structure according to the present invention is: a protruding step is provided at the front end of the bushing, and the dynamic ring assembly is installed on the protruding step.

[0006] A further preferred technical solution of the high-pressure mechanical seal structure according to the present invention is as follows: the rotating ring assembly includes a rotating ring seat and a rotating ring. The rotating ring seat is fixed to a protruding step provided at the front end of the bushing by bolts. A first O-ring is provided between the rotating ring seat and the bushing. The rotating ring is installed on the end face of the protruding step and the rotating ring seat. A second O-ring is provided between the rotating ring and the rotating ring seat.

[0007] A further preferred technical solution of the high-pressure mechanical seal structure according to the present invention is: the stationary ring assembly is formed by a stationary ring mounted on a stationary ring seat, the stationary ring and the rotating ring are correspondingly arranged, the stationary ring seat is mounted on the gland, and an O-ring is provided between the stationary ring seat and the gland.

[0008] A further preferred embodiment of the high-pressure mechanical seal structure according to the present invention is as follows: a spring is provided between the stationary ring seat and the gland, one end of the spring is in contact with the stationary ring seat, and the other end is provided in the mounting hole of the gland.

[0009] A further preferred embodiment of the high-pressure mechanical seal structure according to the present invention is that the counter-rotating sealing assembly is located in the space formed by the gland, the bushing, and the pressure plate, and the counter-rotating sealing assembly does not contact the gland.

[0010] A further preferred embodiment of the high-pressure mechanical seal structure according to the present invention is: the rear end diameter of the gland is reduced to form a step, and the counter-rotating sealing assembly is installed on the step.

[0011] A further preferred technical solution of the high-pressure mechanical seal structure according to the present invention is: an inner transmission sleeve and an outer transmission sleeve are provided at the rear end of the bushing, and the inner transmission sleeve and the outer transmission sleeve are fitted with tapered surfaces and then installed with bolts to achieve the transmission function.

[0012] A further preferred embodiment of the high-pressure mechanical seal structure according to the present invention is: a sealing gas inlet is provided on the side of the gland, and the inlet is connected to the mating surfaces of the dynamic ring and the stationary ring.

[0013] A further preferred embodiment of the high-pressure mechanical seal structure according to the present invention is: a screw plug hole is provided on the side of the gland, the position of which corresponds to the position between the stationary ring seat and the counter-rotating sealing assembly.

[0014] Compared with the prior art, the technical solution of this utility model has the following advantages / benefits:

[0015] 1. It is equipped with a counter-rotating sealing assembly as a mechanical seal, which can withstand higher sealing pressure. At 6-7 MPa, the seal still maintains good sealing performance.

[0016] 2. Suitable for high temperature and high pressure operating environments, it can provide good sealing performance for oil and / or water mixtures. In the event of seal failure, the presence of the counter-rotating seal assembly can also ensure that the material will not be sprayed out directly, greatly reducing the possibility of injury to the operator. That is, the mechanical seal can still play a remedial role after the dry gas seal fails. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a high-pressure mechanical seal structure according to the present invention.

[0019] The markings in the diagram are as follows: 1. Bushing 2. Rotary ring assembly 201. Rotary ring seat 202. Rotary ring 3. Stationary ring assembly 301. Stationary ring 302. Stationary ring seat 4. Pressure cap 5. Counter-rotating sealing assembly 6. Rotating shaft 7. Pressure plate 8. First O-ring 9. Second O-ring 10. O-ring 11. Spring 12. Inner transmission sleeve 13. Outer transmission sleeve 14. Sealing air inlet 15. Screw plug hole. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the detailed description of the embodiments of this utility model provided below is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

[0022] Example:

[0023] like Figure 1As shown, a high-pressure mechanical seal structure is described. It includes a bushing 1, a rotating ring assembly 2, a stationary ring assembly 3, a gland 4, and a counter-rotating seal assembly 5. The bushing 1 is fitted onto a rotating shaft 6. The rotating ring assembly 2 and the stationary ring assembly 3 are fitted together and stacked on the bushing 1. The fitting of the rotating ring assembly 2 and the stationary ring assembly 3 is quite common in dry gas seals, so details such as screws will not be described in detail here. A gland 4 is installed on the stationary ring assembly 3. A gap is provided between the rear end of the gland 4 and the bushing 1 for installing the counter-rotating seal assembly 5. The counter-rotating seal assembly 5 is annular and fitted onto the bushing 1. Its outer surface contacts the inner wall surface of the gland 4. This inner wall surface is the recessed inner wall when the rear end of the gland 4 forms a gap with the bushing 1. The counter-rotating seal assembly 5 is pressed together by a pressure plate 7, which serves both a sealing and pressing function.

[0024] The bushing 1 has a protruding step at its front end, and the moving ring assembly 2 is installed on the protruding step, which serves to support and limit movement.

[0025] The moving ring assembly 2 includes a moving ring seat 201 and a moving ring 202. The moving ring seat 201 is fixed to a protruding step at the front end of the bushing 1 by bolts. A first O-ring 8 is provided between the moving ring seat 201 and the bushing 1. The moving ring 202 is installed on the end face of the protruding step and on the moving ring seat 201. A second O-ring 9 is provided between the moving ring 202 and the moving ring seat 201. The first O-ring 8 and the second O-ring 9 are provided.

[0026] The stationary ring assembly 3 is formed by a stationary ring 301 mounted on a stationary ring seat 302. The stationary ring 301 is correspondingly arranged with the moving ring 202. The stationary ring seat 302 is mounted on the pressure cover 4. An O-ring 10 is provided between the stationary ring seat 302 and the pressure cover 4 to play a sealing role.

[0027] A spring 11 is provided between the stationary ring seat 302 and the pressure cover 4. One end of the spring 11 is in contact with the stationary ring seat 302, and the other end is provided in the mounting hole of the pressure cover 4. The spring 11 plays a shock-absorbing role on the stationary ring seat 302, ensuring the stability of the mating surface of the stationary ring 301 and the moving ring 202.

[0028] The counter-rotating sealing assembly 5 is located in the space formed by the pressure cap 4, the bushing 1, and the pressure plate 7. The counter-rotating sealing assembly 5 does not contact the pressure cap 4, thus preventing the pressure cap 4 from squeezing the counter-rotating sealing assembly 5.

[0029] The rear end diameter of the pressure cap 4 is reduced to form a step. The counter-rotating sealing assembly 5 is installed on this step. One side of the counter-rotating sealing assembly 5 has a space to form a sealing cavity, which communicates with the screw plug hole 15. A screw plug is set in the screw plug hole 15 for sealing. After the screw plug hole is removed, the cleaning requirement can be met. At the same time, coolant or flushing fluid can be injected into the sealing cavity during use to cool the counter-rotating sealing assembly 5 and improve the service life of the seal.

[0030] An inner transmission sleeve 12 and an outer transmission sleeve 13 are provided at the rear end of the bushing 1. The inner transmission sleeve and the outer transmission sleeve are fitted with tapered surfaces and then installed with bolts to achieve the transmission function. The transmission sleeves play the transmission function. The inner transmission sleeve and the outer transmission sleeve can be installed on the rotating shaft 6 and the power element as needed. The detailed installation structure will not be described in detail here.

[0031] The pressure cap 4 is provided with a sealing gas inlet 14 on its side. The inlet is connected to the mating surface of the moving ring 202 and the stationary ring 301. The dry gas sealing effect can be achieved by injecting pressurized sealing gas.

[0032] A screw plug hole 15 is provided on the side of the pressure cap 4. The screw plug hole 15 is located between the stationary ring seat 302 and the counter-rotating sealing assembly 5. The screw plug hole is actually a channel that communicates with the sealing cavity of the counter-rotating sealing assembly 5, and can be set to other closed forms.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] The above are merely preferred embodiments of this utility model. It should be noted that the above preferred embodiments should not be considered as limitations on this utility model, and the scope of protection of this utility model should be determined by the scope defined in the claims. For those skilled in the art, several improvements and modifications can be made without departing from the spirit and scope of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A high-pressure mechanical seal structure, characterized in that, It includes a bushing, a rotating ring assembly, a stationary ring assembly, a gland, and a counter-rotating seal assembly. The bushing is fitted onto the rotating shaft. The rotating ring assembly and the stationary ring assembly are mounted on the bushing in a tandem manner. A gland is installed on the stationary ring assembly. A gap is provided between the rear end of the gland and the bushing for installing the counter-rotating seal assembly. The counter-rotating seal assembly is pressed tightly by a pressure plate.

2. The high-pressure mechanical seal structure according to claim 1, characterized in that, The front end of the bushing is provided with a protruding step, and the moving ring assembly is installed on the protruding step.

3. The high-pressure mechanical seal structure according to claim 2, characterized in that, The rotating ring assembly includes a rotating ring seat and a rotating ring. The rotating ring seat is fixed to a protruding step at the front end of the bushing by bolts. A first O-ring is provided between the rotating ring seat and the bushing. The rotating ring is installed on the end face of the protruding step and the rotating ring seat. A second O-ring is provided between the rotating ring and the rotating ring seat.

4. The high-pressure mechanical seal structure according to claim 3, characterized in that, The stationary ring assembly consists of a stationary ring mounted on a stationary ring seat. The stationary ring and the rotating ring are arranged correspondingly. The stationary ring seat is mounted on the gland, and an O-ring is provided between the stationary ring seat and the gland.

5. The high-pressure mechanical seal structure according to claim 1, characterized in that, A spring is installed between the stationary ring seat and the gland, with one end of the spring in contact with the stationary ring seat and the other end set in the mounting hole of the gland.

6. The high-pressure mechanical seal structure according to claim 5, characterized in that, The counter-rotating sealing assembly is located in the space formed by the gland, bushing, and pressure plate, and the counter-rotating sealing assembly does not contact the gland.

7. A high-pressure mechanical seal structure according to claim 6, characterized in that, The rear end diameter of the gland is reduced to form a step, and the counterspin sealing assembly is installed on this step.

8. The high-pressure mechanical seal structure according to claim 1, characterized in that, An inner transmission sleeve and an outer transmission sleeve are provided at the rear end of the bushing. The inner transmission sleeve and the outer transmission sleeve are fitted with tapered surfaces and then installed with bolts to achieve the transmission function.

9. A high-pressure mechanical seal structure according to claim 1, characterized in that, The side of the gland is provided with a sealing gas inlet, which is connected to the mating surfaces of the moving ring and the stationary ring.

10. A high-pressure mechanical seal structure according to claim 1, characterized in that, A screw plug hole is provided on the side of the gland, and the position of the screw plug hole corresponds to the position between the stationary ring seat and the counter-rotating sealing assembly.

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