Dry friction mechanical sealing device

Abstract

The utility model relates to the technical field of high-speed high-pressure water spraying or oil spraying screw compressors, and discloses a dry friction mechanical sealing device which comprises a bearing seat, a bearing piece installed in the bearing seat, a compressor sealing cavity arranged on one side of the bearing seat, and a mechanical sealing gland installed in the compressor sealing cavity. One side of the mechanical sealing gland is in threaded connection with two connecting screws, and one side of the mechanical sealing gland is fixedly connected with a dry friction mechanical sealing static ring. The dry friction mechanical sealing device is used for a high-speed and high-pressure water or oil spraying screw compressor and is fixed to a gland through a screw, a static ring is located in the gland, a movable ring assembly is connected with a shaft sleeve, the shaft sleeve is tightly pressed with a rotor shaft and a bearing piece, synchronous high-speed rotation is achieved, an oil circulation hole provides cooling lubrication, and a water circulation hole cools a sealing assembly, and a nitrogen control system is not needed. Medium gas is directly used for forming a gaseous film, and direct friction of the sealing face is prevented.

Description

Technical Field

[0001] This utility model relates to the field of high-speed, high-pressure water- or oil-injected screw compressor technology, and in particular to a dry friction mechanical seal device. Background Technology

[0002] High-speed, high-pressure water-jet or oil-jet screw compressors are widely used in gas compression and transportation in fields such as oil and gas transportation, petrochemicals, marine drilling, and aerospace.

[0003] Currently, the seals of high-speed, high-pressure water-injection or oil-injection screw compressors generally use carbon graphite floating ring seals or traditional dry gas seals. Both of these seal types require high-pressure nitrogen as the sealing gas to prevent leakage of the medium gas, and require a nitrogen control system. This not only results in high cost and complex maintenance, but also a large amount of nitrogen leakage. Utility Model Content

[0004] The technical problem to be solved by this utility model is that in the prior art, high-speed high-pressure water-jet or oil-jet screw compressors usually use carbon graphite floating ring seals or dry gas seals. These sealing methods rely on high-pressure nitrogen to prevent leakage of the medium gas, and require a nitrogen control system, which leads to the disadvantages of high cost, complex maintenance and large nitrogen leakage. Therefore, we propose a dry friction mechanical seal device.

[0005] To achieve the above objectives, this application adopts the following technical solution: a dry friction mechanical seal device, including a bearing housing, a bearing component installed inside the bearing housing, a compressor sealing cavity provided on one side of the bearing housing, a mechanical seal cover installed inside the compressor sealing cavity, two connecting screws threaded to one side of the mechanical seal cover, a dry friction mechanical seal stationary ring fixedly connected to one side of the mechanical seal cover, a mechanical seal bushing installed inside the compressor sealing cavity, a dry friction mechanical seal dynamic ring assembly fixedly connected to the surface of the mechanical seal bushing, a compressor rotor shaft installed inside the compressor sealing cavity, bushing rubber sealing rings installed at both ends of the bearing component and the compressor rotor shaft, and a dry friction mechanical seal dynamic ring body installed inside the compressor sealing cavity.

[0006] Preferably, the compressor sealing cavity has a cooling water circulation hole inside, and the surface of the mechanical seal cover is equipped with a first rubber ring and a second rubber ring.

[0007] Preferably, a special curved spiral groove is provided on the outer diameter circumference of the sealing surface of the dynamic ring body of the dry friction mechanical seal, and a special curved spiral groove is provided on the inner diameter circumference of the dynamic ring body of the dry friction mechanical seal.

[0008] Preferably, the dry friction mechanical seal dynamic ring assembly and the mechanical seal bushing are sealed by a PTFE wedge ring.

[0009] Preferably, one end of the bearing housing is provided with an oil circulation hole, and the interior of the compressor sealing cavity is provided with a cooling water circulation hole.

[0010] The technical effects and advantages of this utility model are as follows:

[0011] In this invention, the dry friction mechanical seal is installed in the sealing cavity of a high-speed, high-pressure water- or oil-injected screw compressor. It is fixed to the mechanical seal cover by connecting screws. The stationary ring of the dry friction mechanical seal is fixed inside the mechanical seal cover, and the rotating ring assembly of the dry friction mechanical seal is fixed to the mechanical seal bushing. The mechanical seal bushing is pressed together by the compressor rotor shaft and bearing components at both ends, thereby realizing that the rotating ring assembly of the dry friction mechanical seal, the mechanical seal bushing, and the compressor rotor shaft rotate synchronously at high speed. At the same time, the circulating oil in the oil circulation hole cools and lubricates the mechanical seal and bearing components, and the circulating water in the cooling water circulation hole cools the mechanical seal assembly through the cooling water cavity of the mechanical seal cover. There is no need for a nitrogen control system or nitrogen as a sealing gas. Instead, the medium gas is directly used as the sealing gas to generate a gaseous film in the sealing weir of the mechanical seal friction surface, avoiding direct friction between the mechanical seal surfaces. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0013] Figure 2 This is a structural diagram of the bidirectional special curved spiral groove on the dynamic ring sealing surface of the dry friction mechanical seal of this utility model;

[0014] Figure 3 This utility model provides a structural diagram of the sealing cavity of a water- or oil-injected screw compressor equipped with a dry friction mechanical seal.

[0015] Figure 4 This utility model Figure 3 A magnified structural diagram at point A;

[0016] Figure 5 This utility model Figure 3 A magnified structural diagram at point B.

[0017] Legend: 1. Bearing housing; 2. Bearing component; 3. Oil circulation hole; 4. Connecting screw; 5. Mechanical seal gland; 6. First rubber ring; 7. Cooling water circulation hole; 8. PTFE wedge ring; 9. Dry friction mechanical seal rotating ring assembly; 10. Shaft sleeve rubber seal ring; 11. Second rubber ring; 12. Mechanical seal shaft sleeve; 13. Dry friction mechanical seal stationary ring; 14. Dry friction mechanical seal rotating ring body; 15. Compressor rotor shaft; 16. Compressor sealing cavity. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0019] Reference Figure 1 - Figure 5 As shown, this utility model provides a technical solution: a dry friction mechanical seal device, including a bearing housing 1, a bearing component 2 installed inside the bearing housing 1, a compressor sealing cavity 16 provided on one side of the bearing housing 1, a mechanical seal cover 5 installed inside the compressor sealing cavity 16, two connecting screws 4 threaded to one side of the mechanical seal cover 5, a dry friction mechanical seal stationary ring 13 fixedly connected to one side of the mechanical seal cover 5, a mechanical seal bushing 12 installed inside the compressor sealing cavity 16, a dry friction mechanical seal moving ring assembly 9 fixedly connected to the surface of the mechanical seal bushing 12, a compressor rotor shaft 15 installed inside the compressor sealing cavity 16, bushing rubber seal rings 10 installed at both ends of the bearing component 2 and the compressor rotor shaft 15, and a dry friction mechanical seal moving ring body 14 installed inside the compressor sealing cavity 16. The mechanical seal cavity 16 has a cooling water circulation hole 7 inside. The surface of the mechanical seal cover 5 is equipped with a first rubber ring 6 and a second rubber ring 11. The dry friction mechanical seal is installed in the sealing cavity 16 of the high-speed, high-pressure water-injected or oil-injected screw compressor and is fixed to the mechanical seal cover 5 by connecting screws 4. The stationary ring 13 of the dry friction mechanical seal is fixed inside the mechanical seal cover 5. The moving ring assembly 9 of the dry friction mechanical seal is fixed to the mechanical seal bushing 12. The mechanical seal bushing 12 is pressed by the compressor rotor shaft 15 and the bearing 2 at both ends, thereby realizing that the moving ring assembly 9 of the dry friction mechanical seal, the mechanical seal bushing 12 and the compressor rotor shaft 15 rotate synchronously at high speed. At the same time, the oil circulating in the oil circulation hole 3 cools and lubricates the mechanical seal and the bearing 2, and the water circulating in the cooling water circulation hole 7 cools the mechanical seal assembly through the cooling water chamber of the mechanical seal cover 5.

[0020] Reference Figure 2 As shown in this embodiment: a special curved spiral groove is provided on the outer diameter circumference of the sealing surface of the dry friction mechanical seal dynamic ring body 14, and a special curved spiral groove is provided on the inner diameter circumference of the dry friction mechanical seal dynamic ring body 14. The dry friction mechanical seal stationary ring 13 is fixed on the mechanical seal cover 5, and the mechanical seal cover 5 is fixed on the compressor sealing cavity 16 by connecting screws 4. The dry friction mechanical seal dynamic ring assembly 9 is fixed together with the mechanical seal bushing 12.

[0021] Reference Figure 1As shown in this embodiment: the dry friction mechanical seal dynamic ring assembly 9 and the mechanical seal bushing 12 are sealed by a PTFE wedge ring 8. The mechanical seal bushing 12 is pressed by the bearing 2 and the two ends of the compressor rotor shaft 15 and sealed by the bushing rubber seal ring 10, so that the dry friction mechanical seal dynamic ring assembly 9 and the compressor rotor shaft 15 rotate synchronously at high speed.

[0022] Reference Figure 1 As shown in this embodiment: an oil circulation hole 3 is provided at one end of the bearing housing 1, and a cooling water circulation hole 7 is provided inside the compressor sealing cavity 16. The cooling water circulation hole 7 on the compressor sealing cavity 16 passes through the cooling water cavity on the mechanical seal cover 5 and is sealed and cooled by the first rubber ring 6 and the second rubber ring 11.

[0023] Working principle: The dry friction mechanical seal is installed in the sealing cavity 16 of a high-speed, high-pressure water-injected or oil-injected screw compressor. It is fixed to the mechanical seal cover 5 by connecting screws 4. The stationary ring 13 of the dry friction mechanical seal is fixed inside the mechanical seal cover 5. The rotating ring assembly 9 of the dry friction mechanical seal is fixed to the mechanical seal bushing 12. The mechanical seal bushing 12 is pressed by the compressor rotor shaft 15 and bearing 2 at both ends, thereby realizing that the rotating ring assembly 9, the mechanical seal bushing 12, and the compressor rotor shaft 15 rotate synchronously at high speed. At the same time, the oil circulating in the oil circulation hole 3 cools and lubricates the mechanical seal and bearing 2, and the water circulating in the cooling water circulation hole 7 cools the compressor through the cooling water chamber of the mechanical seal cover 5. The dry friction mechanical seal assembly includes a stationary ring 13 fixed to the mechanical seal cover 5, which is then fixed to the compressor sealing cavity 16 by connecting screws 4. The rotating ring assembly 9 of the dry friction mechanical seal is fixed together with the mechanical seal bushing 12. The mechanical seal bushing 12 is pressed against both ends of the compressor rotor shaft 15 by bearing components 2 and sealed by bushing rubber seal rings 10, so that the rotating ring assembly 9 of the dry friction mechanical seal rotates synchronously and at high speed with the compressor rotor shaft 15. A cooling water circulation hole 7 is provided on the compressor sealing cavity 16, through which the cooling water cavity on the mechanical seal cover 5 is sealed and cooled by the first rubber ring 6 and the second rubber ring 11.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dry friction mechanical seal device, comprising a bearing housing (1), characterized in that: The bearing housing (1) is equipped with a bearing component (2). A compressor sealing cavity (16) is provided on one side of the bearing housing (1). A mechanical seal cover (5) is installed inside the compressor sealing cavity (16). Two connecting screws (4) are threaded to one side of the mechanical seal cover (5). A dry friction mechanical seal stationary ring (13) is fixedly connected to one side of the mechanical seal cover (5). A mechanical seal bushing (12) is installed inside the compressor sealing cavity (16). A dry friction mechanical seal moving ring assembly (9) is fixedly connected to the surface of the mechanical seal bushing (12). A compressor rotor shaft (15) is installed inside the compressor sealing cavity (16). A bushing rubber seal ring (10) is installed at both ends of the bearing component (2) and the compressor rotor shaft (15). A dry friction mechanical seal moving ring body (14) is installed inside the compressor sealing cavity (16).

2. The dry friction mechanical seal device according to claim 1, characterized in that: The compressor sealing cavity (16) has a cooling water circulation hole (7) inside, and the surface of the mechanical seal cover (5) is equipped with a first rubber ring (6) and a second rubber ring (11).

3. The dry friction mechanical seal device according to claim 1, characterized in that: The outer diameter circumference of the sealing surface of the dry friction mechanical seal dynamic ring body (14) is provided with a special curved spiral groove, and the inner diameter circumference of the dry friction mechanical seal dynamic ring body (14) is provided with a special curved spiral groove.

4. The dry friction mechanical seal device according to claim 1, characterized in that: The dry friction mechanical seal dynamic ring assembly (9) and the mechanical seal bushing (12) are sealed by a PTFE wedge ring (8).

5. The dry friction mechanical seal device according to claim 1, characterized in that: An oil circulation hole (3) is provided at one end of the bearing housing (1), and a cooling water circulation hole (7) is provided inside the compressor sealing cavity (16).

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