CN111577899A - Double shaft high pressure mechanical seal device - Google Patents

Abstract

The invention discloses a double-shaft high-pressure mechanical sealing device, comprising a movable flange, a mechanical seal main body is arranged on the movable flange, the bottom of the mechanical seal main body is provided with a fixed flange matched with the movable flange, and the mechanical seal main body is provided with a fixed flange corresponding to the movable flange. The outer rotating shaft is arranged on a coaxial line. The outer rotating shaft is a hollow shaft structure. The upper and lower ends of the outer rotating shaft protrude from the upper and lower ends of the main body of the mechanical seal respectively. Protruding from the upper and lower ends of the outer rotating shaft, the outer rotating shaft is sleeved with a first bearing embedded in the main body of the mechanical seal, the inner rotating shaft is sleeved with a second bearing embedded in the outer rotating shaft, and the upper end of the mechanical seal main body is provided with an extension for the outer rotating shaft. For the first press cover, the upper end of the outer rotating shaft is provided with a second press cover for the inner rotating shaft to extend. The mechanical sealing device has the characteristics of good sealing effect, low overall height, stable rotation and operation, and small error caused by long-term use, excellent sealing performance, complete overall function and strong practicability.

Description

Double shaft high pressure mechanical seal device

technical field

The invention relates to the technical field of mechanical seals, and more particularly, to a double-shaft high-pressure mechanical seal device.

Background technique

In some reaction kettles or reaction vessels, it is necessary to intermittently stir the contained liquid in order to meet the appropriate use requirements, and since various liquids affect their use temperature due to different stirring frequencies, it will affect the liquid that protrudes into the kettle or container. The stirring device provides different speeds to achieve the effect of double-shaft stirring. In order to achieve the double-shaft stirring effect, the structure of the stirring shaft is mostly a single-shaft type, and a single power source provides different rotational speeds to the shaft body, so as to achieve the effect of double-shaft stirring, but this makes the overall height larger, and the shaft body rotates during the process. It is easy to swing, the error increases after long-term use, the sealing effect is weakened, and the overall effect is not good. Accordingly, the present invention proposes a double-shaft high-pressure mechanical seal device.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and to provide a double-shaft high-pressure mechanical seal device, which has the characteristics of good sealing effect, low overall height, stable rotation and operation, and the The error is small and the sealing performance is excellent.

In order to solve the above-mentioned technical problems, the purpose of the present invention is achieved in this way: a biaxial high-pressure mechanical sealing device involved in the present invention includes a movable flange fixedly connected with the outer wall of the container, and the movable flange is provided with a mechanical sealing body, The bottom of the seal main body is provided with a fixed flange that matches the movable flange, the mechanical seal main body is provided with an outer rotating shaft arranged coaxially with it, the outer rotating shaft is a hollow shaft structure, and the upper and lower ends of the outer rotating shaft respectively extend Out of the upper and lower ends of the main body of the machine seal, the outer rotating shaft is provided with an inner rotating shaft arranged coaxially with it, and the upper and lower ends of the inner rotating shaft respectively protrude from the upper and lower ends of the outer rotating shaft. The first bearing in the main body of the seal, the inner shaft is sleeved with a second bearing embedded in the outer shaft, the upper end of the main body of the machine seal is provided with a first gland for the extension of the outer shaft, and the upper end of the outer shaft A second gland for extending the inner rotating shaft is provided.

The present invention is further provided that: a first heat dissipation cavity located below the first bearing is formed between the main body of the mechanical seal and the outer rotating shaft, and the outer rotating shaft is sleeved with a first axial direction blocking the first heat dissipation cavity and the outside of the main body of the mechanical seal A sealing ring assembly and a second axial sealing ring assembly for blocking the first heat dissipation cavity and the inside of the container.

The present invention is further configured as follows: a second heat dissipation cavity located below the second bearing is formed between the outer rotating shaft and the inner rotating shaft, and a third axial seal is sleeved on the inner rotating shaft to block the second heat dissipation cavity and the outside of the mechanical seal body A ring assembly, and a fourth axial sealing ring assembly for blocking the second heat dissipation cavity and the inside of the container.

The present invention is further provided as follows: the outer rotating shaft is provided with a guide hole that communicates with the first heat dissipation cavity and the second heat dissipation cavity, and the mechanical seal main body is provided with a cooling water inlet and Cooling water outlet.

The present invention is further provided that: the lower end face of the outer rotating shaft is threadedly connected with a mounting screw for fixing the agitator.

The present invention is further provided as follows: the main body of the machine seal is provided with a hoisting ring.

To sum up, the present invention has the following beneficial effects: the dual-shaft high-pressure mechanical seal device involved in the present invention is realized by improving the shaft body providing rotational power to a relatively rotating inner and outer shaft structure, and providing kinetic energy from two different power sources. Rotation achieves the effect of double-shaft stirring, and reduces the overall height of the sealing device. During the rotation of the shaft body, the centrifugal force is small, it is not easy to sway, the rotation runs smoothly, and the axial offset error caused by long-term use is small. Excellent sealing performance, perfect overall function and strong practicability.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

FIG. 2 is a schematic diagram of a part of the structure of the present invention.

Detailed ways

In order to make those skilled in the art better understand the new technical solution of the present experiment, the preferred embodiments of the present invention are described below in conjunction with specific examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and It is not a limitation of the patent requirements of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

Referring to FIGS. 1 to 2 , a biaxial high-pressure mechanical sealing device involved in this embodiment includes a movable flange 1 fixedly connected to the outer wall of the container, and the movable flange 1 is provided with a mechanical seal body 2 , and the mechanical seal body 2 The bottom is provided with a fixed flange 3 that matches the movable flange 1, and an outer rotating shaft 4 arranged coaxially with the mechanical seal body 2 is arranged in the outer rotating shaft 4. The outer rotating shaft 4 is a hollow shaft structure. The upper and lower ends protrude from the upper and lower ends of the main body 2 of the mechanical seal respectively, the outer rotating shaft 4 is provided with an inner rotating shaft 5 arranged coaxially with it, and the upper and lower ends of the inner rotating shaft 5 respectively protrude from the upper and lower ends of the outer rotating shaft 4, so The outer rotating shaft 4 is sleeved with a first bearing 6 embedded in the main body 2 of the mechanical seal, the inner rotating shaft 5 is sleeved with a second bearing 7 embedded in the outer rotating shaft 4, and the upper end of the main body 2 of the mechanical seal is provided with a A first pressure cover 8 extending from the outer rotating shaft 4 is provided on the upper end of the outer rotating shaft 4 with a second pressure cover 9 for extending the inner rotating shaft 5 .

In this embodiment, a driven sprocket is set on the part of the outer rotating shaft 4 that extends out of the upper end face of the main body 2 of the mechanical seal, and a driving sprocket that cooperates with it is arranged in the same horizontal plane. The sprocket provides a rotating power source, and another rotating power source is arranged on the upper end of the inner rotating shaft 5. Finally, non-interfering stirring components are respectively arranged at the lower ends of the outer rotating shaft 4 and the inner rotating shaft 5. By switching different rotational power sources, the stirring assembly on the outer rotating shaft 4 can stir the solution in the container or the stirring assembly on the inner rotating shaft 5 can stir the solution in the container, which can be used flexibly and reduce the overall height of the shaft body.

Among them, the two rotational power sources preferably use electric motors to provide power.

Further, a first heat dissipation cavity 10 located below the first bearing 6 is formed between the mechanical seal main body 2 and the outer rotating shaft 4 . The first axial seal ring assembly 11 and the second axial seal ring assembly 12 that blocks the first heat dissipation cavity 10 and the inside of the container; The second heat dissipation cavity 13, the inner shaft 5 is sleeved with a third axial sealing ring assembly 14 that blocks the second heat dissipation cavity 13 and the outside of the mechanical seal body 2, and a fourth axial seal ring assembly 14 that blocks the second heat dissipation cavity 13 and the inside of the container. Axial sealing ring assembly 15; further, the outer shaft 4 is provided with a guide hole 16 that communicates with the first heat dissipation cavity 10 and the second heat dissipation cavity 13, and the mechanical seal body 2 is provided with a first heat dissipation cavity. The cooling water inlet 17 and the cooling water outlet 18 communicate with each other in the interior of 10 .

The upper and lower parts of the first heat dissipation cavity 10 blocked by the first axial seal ring assembly 11 and the second axial seal ring assembly 12 are blocked by the third axial seal ring assembly 14 and the fourth axial seal ring assembly 15. Interconnecting guide holes 16 are arranged between the disconnected second heat dissipation chambers 13, so that a closed chamber is formed, and cooling water for circulating circulation is arranged in the closed chamber, and one end of the cooling water is connected to the cooling water inlet 17, and the other end is connected to the cooling water inlet 17. One end is connected to the cooling water outlet 18, so as to reduce the contact between the shaft body (including the outer shaft 4 and the inner shaft 5) during high-speed rotation with each seal ring assembly (including the first axial seal ring assembly 11, the second axial seal ring assembly 12. The heat generated by the friction of the third axial sealing ring assembly 14 and the fourth axial sealing ring assembly 15) achieves a good heat dissipation effect.

Among them, the first axial seal ring assembly 11, the second axial seal ring assembly 12, the third axial seal ring assembly 14 and the fourth axial seal ring assembly 15 are all existing multiple seals with good sealing effect It is made of a composite set of rings, and its cross-sectional shapes are various, but the final effect is the same.

Further, the lower end surface of the outer rotating shaft 4 is threadedly connected with mounting screws 19 for fixing the agitator. The setting of the mounting screws 19 is used to cooperate with and connect the existing stirring components that can realize the stirring function, so that the disassembly and assembly are convenient and the installation is convenient. and easy maintenance.

Further, the main body 2 of the machine seal is provided with a lifting ring 20, and through the setting of the lifting ring 20, the whole can be hoisted, which is convenient for transfer and operation.

The dual-shaft high-pressure mechanical sealing device involved in the present invention achieves the effect of dual-shaft stirring by improving the shaft body that provides rotational power into a relatively rotating inner and outer shaft structure, and provides kinetic energy from two different power sources to achieve rotation. The overall height of the sealing device, the centrifugal force of the shaft body is small during the rotation process, it is not easy to sway, the rotation runs smoothly, and the axial offset error caused by long-term use is small, the sealing performance is excellent, the overall function is complete, and the practicability is strong.

Unless otherwise specified, in the present invention, if the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", " Orientation or positional relationship indicated by horizontal, top, bottom, inner, outer, clockwise, counterclockwise, axial, radial, circumferential, etc. It is based on the actual shown orientation or positional relationship, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore the present invention The terms describing the orientation or positional relationship in the above are only used for exemplary illustration, and should not be construed as a limitation to the present patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations in combination with the embodiments.

Unless otherwise specified and limited, in the present invention, the terms "arranged", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection ; It can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and changes according to the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the prior art according to the concept of the present invention shall fall within the protection scope determined by the claims.

Claims (6)

1. The biaxial high-pressure mechanical sealing device comprises a movable flange fixedly connected with the outer wall of the container, the movable flange is provided with a main body of the mechanical seal, and the bottom of the main body of the mechanical seal is provided with a fixed flange that cooperates with the movable flange, it is characterized in that : There is an outer rotating shaft coaxially arranged in the main body of the mechanical seal. The outer rotating shaft is a hollow shaft structure. The inner rotating shaft is arranged on a coaxial line, the upper and lower ends of the inner rotating shaft respectively protrude from the upper and lower ends of the outer rotating shaft, the outer rotating shaft is sleeved with a first bearing embedded in the main body of the machine seal, and the inner rotating shaft is sleeved with an embedded For the second bearing in the outer rotating shaft, the upper end of the mechanical seal body is provided with a first gland for extending the outer rotating shaft, and the upper end of the outer rotating shaft is provided with a second gland for extending the inner rotating shaft. 2 . The dual-shaft high-pressure mechanical seal device according to claim 1 , wherein a first heat dissipation cavity located below the first bearing is formed between the main body of the mechanical seal and the outer rotating shaft, and a blocking block is sleeved on the outer rotating shaft. 3 . The first heat dissipation cavity and the first axial sealing ring assembly outside the main body of the machine seal, and the second axial sealing ring assembly blocking the first heat dissipation cavity and the inside of the container. 3 . The dual-shaft high-pressure mechanical seal device according to claim 2 , wherein a second heat dissipation cavity is formed between the outer rotating shaft and the inner rotating shaft under the second bearing, and the inner rotating shaft is sleeved with a blocking Two heat dissipation chambers and a third axial sealing ring assembly outside the main body of the machine seal, and a fourth axial sealing ring assembly blocking the second heat dissipation chamber and the inside of the container. 4 . The dual-shaft high-pressure mechanical seal device according to claim 3 , wherein the outer rotating shaft is provided with a guide hole connecting the first heat dissipation cavity and the second heat dissipation cavity, and the mechanical seal body is provided with a guide hole. 5 . A cooling water inlet and a cooling water outlet communicated with the inside of the first heat dissipation cavity. 5 . The double-shaft high-pressure mechanical seal device according to claim 1 , wherein the lower end face of the outer rotating shaft is threadedly connected with a mounting screw for fixing the agitator. 6 . 6 . The biaxial high-pressure mechanical seal device according to claim 1 , wherein a lifting ring is provided on the main body of the mechanical seal. 7 .

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