CN219733714U - Shaft seal mechanism and shaft seal fan - Google Patents

Abstract

The utility model discloses a shaft seal mechanism and a shaft seal fan, comprising a shaft seal assembly, a shaft seal assembly and a shaft seal assembly, wherein the shaft seal assembly comprises a shaft seal piece, a sealing carbon ring and a mounting piece; the pressure seal assembly comprises a sealing element arranged in the mounting element, a pressure disc arranged on one side of the sealing element and an adjusting element arranged on the pressure disc, wherein the adjusting element is used for adjusting the pressure applied by the pressure disc to the sealing element.

Description

Shaft seal mechanism and shaft seal fan

Technical Field

The utility model relates to the technical field of shaft seal fans, in particular to a shaft seal mechanism and a shaft seal fan.

Background

Fans are a familiar abbreviation for gas compression and gas transport machinery, and are generally called fans comprising: ventilators, blowers, fans, etc.

The shaft seal exhaust fan has the main function of establishing negative pressure for the shaft seal of the steam turbine and has the following points that firstly, the shaft seal is established with negative pressure, so that the efficiency of the steam turbine unit is improved; a second point is to prevent the lubricating oil from emulsifying; and thirdly, preventing leaked gas from polluting workshop environment.

The shaft seal fan is generally composed of a shaft seal mechanism and a fan, the fan is used for guiding the flow of steam and air flow, and the shaft seal mechanism is used for sealing the connecting part between the fan and the driving structure so as to avoid gas leakage.

One shaft seal fan is actually required to run on site, and the other shaft seal fan is reserved for standby; under the condition that steam turbine shaft seal steam is not completely condensed, part of steam can be extracted by the shaft seal fan, one path of steam is discharged out of the chamber, and the other path of steam can be accumulated in the standby shaft seal fan to cause steam accumulation in the standby shaft seal fan.

In the use, the inside inert gas that lets in of shaft seal mechanism of shaft seal fan changes the pressure differential at shaft seal both ends, prevents that the condition of leakage from appearing, and during actual use, reserve shaft seal fan does not work, and the shaft seal position does not let in gas, and its leakproofness is relatively poor when not working, can cause reserve shaft seal fan inside steam accumulation ponding, leads to shaft seal fan motor frequent fever, and in addition, the hydrophobic ability of shaft seal fan is relatively poor when using, and the surface with steam contact causes the accumulation of moisture easily in steam circulation in-process, is difficult to get rid of, influences the life of equipment.

Disclosure of Invention

This section is intended to outline some aspects of embodiments of the utility model and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the utility model and in the title of the utility model, which may not be used to limit the scope of the utility model.

The present utility model has been made in view of the above or the problem of poor sealing properties of the shaft seal mechanism when not in operation in the prior art.

It is therefore an object of the present utility model to provide a shaft seal mechanism assembly.

In order to solve the technical problems, the utility model provides the following technical scheme: the sealing device comprises a shaft seal assembly, a sealing ring, a mounting piece and a sealing ring, wherein the shaft seal assembly comprises a shaft seal piece, the sealing ring is arranged in the shaft seal piece, and the mounting piece is arranged at one end of the shaft seal piece; the pressure seal assembly comprises a sealing element arranged in the mounting element, a pressure disc arranged on one side of the sealing element, and an adjusting element arranged on the pressure disc, wherein the adjusting element is used for adjusting the pressure exerted by the pressure disc on the sealing element.

As a preferable aspect of the shaft seal mechanism of the present utility model, wherein: the shaft seal piece comprises a shaft seal sleeve arranged outside the sealing carbocycle, a circulation groove and a buffer cavity are formed in the shaft seal sleeve, and a gas pipe is arranged on the outer wall of the shaft seal sleeve.

As a preferable aspect of the shaft seal mechanism of the present utility model, wherein: the mounting piece comprises a connecting flange arranged at one end of the shaft seal sleeve and a sealing ring arranged on the surface of the connecting flange, and the surface of the connecting flange is connected with a mounting disc in a fitting manner; the connecting flange is connected with the mounting plate through bolts.

As a preferable aspect of the shaft seal mechanism of the present utility model, wherein: the sealing element comprises a sealing ring arranged inside the connecting flange and the mounting plate, and a cavity arranged inside the sealing ring.

As a preferable aspect of the shaft seal mechanism of the present utility model, wherein: the adjusting piece comprises a pressure arm arranged on the pressure disc and a screw rod arranged on the pressure arm, wherein the outer wall of the screw rod is in threaded connection with a threaded knob, and the outer wall of the screw rod is sleeved with a spring.

As a preferable aspect of the shaft seal mechanism of the present utility model, wherein: the circulation groove is S-shaped and is arranged on the inner wall of the shaft sleeve, the buffer cavity is of an annular structure, and the size of the inner wall of the buffer cavity is matched with the size of the outer wall of the sealing carbocycle.

As a preferable aspect of the shaft seal mechanism of the present utility model, wherein: one end of the screw rod penetrates through the mounting plate and extends to the inside of the threaded knob.

The shaft seal mechanism has the beneficial effects that: according to the utility model, the screw is driven to apply pressure to the pressure disc by rotating the threaded knob, so that the spring is compressed, the pressure disc compresses the sealing ring, and the cavity in the sealing ring is deformed after being extruded during compression, so that the sealing ring is filled in the cavity of the connecting flange and the mounting disc to form reinforced seal, and when the shaft seal mechanism does not work, good sealing performance can be maintained, gas leakage is prevented, and the condition that the shaft seal fan motor is burnt due to steam can occur.

In view of the fact that in the practical use process, the problem of poor water-repellent capacity of the shaft seal fan in use also exists.

In order to solve the technical problems, the utility model also provides the following technical scheme: a shaft seal fan comprises a shaft seal mechanism, a power mechanism arranged on the surface of a mounting disc and a drainage mechanism arranged on the surface of the power mechanism.

As a preferable mode of the shaft seal fan of the utility model, wherein: the power mechanism comprises a driving assembly arranged on the surface of the mounting plate, a connecting shaft is arranged at the output end of the driving assembly, a fan blade is arranged at one end of the connecting shaft, and the power mechanism further comprises a flow guiding shell arranged on the surface of the mounting plate.

As a preferable mode of the shaft seal fan of the utility model, wherein: the drainage mechanism comprises a U-shaped pipe arranged on the surface of the diversion shell, a control valve arranged on the outer wall of the U-shaped pipe, and a diversion trench arranged on the surface of the fan blade; the U-shaped pipe is of a U-shaped structure.

The shaft seal fan has the beneficial effects that: the driving assembly operates to drive the connecting shaft to rotate, so that the fan blades are driven to work to supply air, steam is guided to circulate in the guide shell, after the operation is stopped, the guide grooves on the surfaces of the fan blades can guide condensed liquid to slide down, the condensed liquid drops in the guide shell and slides to the bottom of the U-shaped pipe to be converged, and the control valve is opened to drain water accumulated in the U-shaped pipe to drain water conveniently.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:

fig. 1 is an overall schematic diagram of a shaft seal mechanism and a shaft seal fan.

Fig. 2 is a schematic view of the internal structure of the shaft seal mechanism.

FIG. 3 is a schematic view of the connection structure of the shaft seal assembly and the press seal assembly of the shaft seal mechanism.

FIG. 4 is a schematic view of the flow channel and buffer chamber configuration of the shaft seal mechanism.

Fig. 5 is a schematic view of the open structure of the deflector housing of the shaft seal fan.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present utility model is not limited to the specific embodiments disclosed below.

Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the utility model. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Example 1

Referring to fig. 1 to 4, in a first embodiment of the present utility model, a shaft seal mechanism is provided, which can reduce the pressure when gas leaks out of a shaft seal, and includes a shaft seal assembly 100, which includes a shaft seal member 101, and a sealing carbon ring 102 disposed inside the shaft seal member 101, and further includes a mounting member 103 disposed at one end of the shaft seal member 101, wherein the shaft seal member 101 is a hollow cylinder structure, the sealing carbon ring 102 can rotate inside the shaft seal member 101, and the sealing carbon ring 102 is connected with a rotating member through the shaft seal member 101, so as to reduce friction during rotation of the rotating member, and the mounting member 103 is used for mounting the shaft seal member 101.

Specifically, the shaft seal piece 101 includes the shaft seal cover 101a that locates the outside of sealed carbocycle 102, circulation groove 101b and buffer chamber 101c have been seted up to the inside of shaft seal cover 101a, the outer wall of shaft seal cover 101a is equipped with gas-supply pipe 101d, the inside circulation groove 101b of shaft seal piece 101 can guide the inflow of gas, because the inside that sets up of circulation groove 101b the gas first flows into shaft seal cover 101a from circulation groove 101b, and inside buffer chamber 101c forms the separation barrier, increase the route and the degree of difficulty of gas flow, consume the energy that the gas flows, the inside of buffer chamber 101c is located to sealed carbocycle 102, carry out multiple separation, reduce the pressure of getting into shaft seal mechanism gas, gas-supply pipe 101d is used for letting in high-pressure nitrogen gas, hinder the overflow of steam, form sealedly, prevent the escape of gas out of the shaft seal mechanism.

Further, the mounting member 103 includes a connecting flange 103a disposed at one end of the shaft envelope 101a, and a sealing ring 103b disposed on a surface of the connecting flange 103a, where a mounting plate 103c is attached to a surface of the connecting flange 103 a; through bolted connection, flange 103a and mounting disc 103c between, flange 103a can be fixed with the connection between the mounting disc 103c through the bolt, conveniently installs and dismantles, and flange 103a and mounting disc 103c surface all are provided with the seal groove, and the seal groove can supply sealing washer 103b to imbed, seals the laminating between the two through sealing washer 103b, prevents the leakage of gas.

The flow groove 101b is formed in an S shape and is arranged on the inner wall of the shaft seal sleeve 101a, the buffer cavity 101c is of an annular structure, the inner wall size of the buffer cavity 101c and the outer wall size of the sealing carbon ring 102 are matched with each other, the flow path of gas can be changed through the S-shaped flow groove 101b, the gas can be blocked when flowing in the flow groove 101b, accordingly, the energy consumption is reduced, the pressure during overflowing is reduced, the flow of the gas is changed by matching with the buffer cavities 101c, the blocking is increased, and the pressure of the gas is reduced.

When the sealed carbon ring 102 is used, the gas pipe 101d is used for introducing high-pressure nitrogen gas to prevent steam from overflowing, steam inside the fan flows into the shaft seal sleeve 101a through the circulation groove 101b, the buffer cavity 101c inside the buffer cavity forms a blocking barrier, the gas flowing path and difficulty are increased, the gas flowing energy is consumed, the sealed carbon ring 102 supports the rotating piece, meanwhile, overflowing gas is blocked, the gas is supported and separated between the sealed carbon ring 102 and the rotating piece, the rotating friction of the rotating piece is reduced, the high-pressure nitrogen gas forms a reaction force to outwards overflow against the steam, and the seal is formed.

In conclusion, the shaft seal mechanism has good sealing performance in the use process, and can prevent the gas in the shaft seal from overflowing outwards through the shaft seal.

Example 2

Referring to fig. 1 to 3, in a second embodiment of the present utility model, unlike the previous embodiment, the present embodiment provides a press seal assembly 200 of a shaft seal mechanism, which solves the problem of poor sealing performance when the shaft seal mechanism is not in operation, and includes a sealing member 201 disposed in a mounting member 103, a pressure disc 202 disposed on one side of the sealing member 201, and an adjusting member 203 disposed on the pressure disc 202, wherein the adjusting member 203 is used for adjusting the pressure exerted by the pressure disc 202 on the sealing member 201, and when the shaft seal mechanism is not in operation, the gas pipe 101d is not filled with high pressure nitrogen, and at this time, because a gap exists between the rotating member and the shaft seal member 101, the pressure disc 202 extrudes the sealing member 201 by adjusting the adjusting member 203, and seals the gap between the rotating member and the shaft seal member 101, thereby preventing gas from overflowing.

Specifically, the sealing member 201 includes a sealing ring 201a disposed inside the connecting flange 103a and the mounting disc 103c, and a cavity 201b disposed inside the sealing ring 201a, where the sealing ring 201a disposed inside the connecting flange 103a and the mounting disc 103c is in a state of separation and non-lamination between an inner surface of the sealing ring and the rotating member in a normal state, so that the rotating member can be conveniently rotated at this time, and when the shaft seal mechanism does not work, the sealing ring 201a is pressed by pressing the sealing ring 201a, so that the cavity 201b is compressed, and an inner wall of the sealing ring is laminated with an outer wall of the rotating member, thereby realizing sealing and preventing gas escape.

Further, the adjusting member 203 includes a pressure arm 203a disposed on the pressure disc 202, and a screw 203b disposed on the pressure arm 203a, wherein a threaded knob 203c is screwed on an outer wall of the screw 203b, a spring 203d is sleeved on an outer wall of the screw 203b, the pressure arm 203a is provided with three groups and is distributed on a periphery of the pressure disc 202, the threaded knob 203c at a peripheral position is rotated, so that the screw 203b drives the pressure disc 202 to compress the spring 203d, and the pressure disc 202 applies pressure to deform the sealing ring 201 a.

Preferably, one end of the screw 203b penetrates the mounting plate 103c and extends into the threaded knob 203c, and after the screw 203b penetrates the mounting plate 103c, a worker can adjust and rotate the threaded knob 203c externally, thereby adjusting the state of the seal ring 201 a.

When the shaft seal mechanism is not used, high-pressure nitrogen is not introduced into the gas pipe 101d, the pressure at two ends of the shaft seal mechanism at the moment is unbalanced, steam has a tendency to overflow outwards, a worker rotates the threaded knob 203c to enable the screw 203b to drive the pressure disc 202 to compress the spring 203d, the pressure disc 202 exerts pressure to enable the sealing ring 201a to deform, the sealing ring 201a is extruded, the cavity 201b is compressed, the cavity 201b is flattened, the inner wall of the cavity is attached to the outer wall of the rotating piece to realize sealing, and escape of gas is prevented.

In conclusion, when the shaft seal mechanism does not work, good sealing performance can be ensured, steam is prevented from overflowing outwards, and steam is prevented from entering the motor of the fan to burn.

Example 3

Referring to fig. 5, in a third embodiment of the present utility model, unlike the previous embodiment, the present utility model provides a shaft seal fan device, which solves the problem of poor water drainage capability of the shaft seal fan during use, and includes the shaft seal mechanism in the previous embodiment, and the power mechanism 300 disposed on the surface of the mounting plate 103c, and further includes the water drainage mechanism 400 disposed on the surface of the power mechanism 300, where the power mechanism 300 is used to provide power output when the shaft seal fan works, and the water drainage mechanism 400 guides the condensed water accumulated in the shaft seal fan, so as to facilitate drainage.

Specifically, the power mechanism 300 includes a driving assembly 301 disposed on a surface of the mounting disc 103c, a connecting shaft 302 is disposed at an output end of the driving assembly 301, a fan blade 303 is disposed at one end of the connecting shaft 302, the driving assembly 301 is a driving motor, the connecting shaft 302 is used as a rotating member for driving the fan blade 303 to rotate, thereby guiding steam flow, and the guiding housing 304 guides gas flow.

Further, the water drain mechanism 400 includes a U-shaped pipe 401 disposed on the surface of the flow guiding shell 304, and a control valve 402 disposed on the outer wall of the U-shaped pipe 401, and further includes a flow guiding groove 403 disposed on the surface of the fan blade 303, where the U-shaped pipe 401 facilitates inflow and convergence of condensed water inside the flow guiding shell 304, and the collected condensed water can be discharged by opening the control valve 402, and when steam is condensed, the flow guiding groove 403 on the surface of the fan blade 303 can not only increase the contact area with the steam, but also guide the condensed water to slide down, so as to improve the condensation efficiency; the U-shaped pipe 401 is U-shaped structure, and U-shaped structure both ends and water conservancy diversion casing 304 circulate, promote the circulation when comdenstion water gets into, make things convenient for the circulation of gas.

When the device is used, the fan blades 303 are driven by the driving motor to rotate, the flow of gas is guided by the flow guiding shell 304, and when the device stops working, steam can be condensed in the flow guiding shell 304, the contact area between the steam and the steam is increased through the flow guiding groove 403, meanwhile, the condensed water is guided to slide to the bottom of the flow guiding shell 304, enters the U-shaped pipe 401, and the collected water is discharged by opening the control valve 402.

In conclusion, the shaft seal fan has better dredging capacity and is convenient for discharging condensed water inside.

It is important to note that the construction and arrangement of the utility model as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of present utility model. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present utility models. Therefore, the utility model is not limited to the specific embodiments, but extends to various modifications that nevertheless fall within the scope of the appended claims.

Furthermore, in order to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those not associated with the best mode presently contemplated for carrying out the utility model, or those not associated with practicing the utility model).

It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.

It should be noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present utility model may be modified or substituted without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered in the scope of the claims of the present utility model.

Claims (10)

1. A shaft seal mechanism, characterized in that: comprising the steps of (a) a step of,

the shaft seal assembly (100) comprises a shaft seal piece (101), a sealing carbon ring (102) arranged in the shaft seal piece (101) and a mounting piece (103) arranged at one end of the shaft seal piece (101);

the press seal assembly (200) comprises a sealing element (201) arranged in the mounting element (103), a pressure disc (202) arranged on one side of the sealing element (201), and an adjusting element (203) arranged on the pressure disc (202), wherein the adjusting element (203) is used for adjusting the pressure exerted by the pressure disc (202) on the sealing element (201).

2. The shaft seal mechanism of claim 1 wherein: the shaft seal piece (101) comprises a shaft seal sleeve (101 a) arranged outside the sealing carbocycle (102), a circulation groove (101 b) and a buffer cavity (101 c) are formed in the shaft seal sleeve (101 a), and a gas pipe (101 d) is arranged on the outer wall of the shaft seal sleeve (101 a).

3. The shaft seal mechanism of claim 2 wherein: the mounting piece (103) comprises a connecting flange (103 a) arranged at one end of the shaft seal sleeve (101 a) and a sealing ring (103 b) arranged on the surface of the connecting flange (103 a), and a mounting disc (103 c) is attached to the surface of the connecting flange (103 a);

the connecting flange (103 a) and the mounting plate (103 c) are connected through bolts.

4. The shaft seal mechanism of claim 3 wherein: the sealing element (201) comprises a sealing ring (201 a) arranged inside the connecting flange (103 a) and the mounting disc (103 c), and a cavity (201 b) arranged inside the sealing ring (201 a).

5. The shaft seal mechanism of claim 4 wherein: the adjusting piece (203) comprises a pressure arm (203 a) arranged on the pressure disc (202) and a screw rod (203 b) arranged on the pressure arm (203 a), wherein a threaded knob (203 c) is connected to the outer wall of the screw rod (203 b) in a threaded manner, and a spring (203 d) is sleeved on the outer wall of the screw rod (203 b).

6. The shaft seal mechanism of claim 3 or 5 wherein: the circulating groove (101 b) is S-shaped and is formed in the inner wall of the shaft seal sleeve (101 a), the buffer cavity (101 c) is of an annular structure, and the size of the inner wall of the buffer cavity (101 c) is matched with the size of the outer wall of the sealing carbocycle (102).

7. The shaft seal mechanism of claim 5 wherein: one end of the screw (203 b) penetrates through the mounting plate (103 c) and extends to the inside of the threaded knob (203 c).

8. A shaft seal fan, characterized in that: comprising the shaft seal mechanism according to any one of claims 3 to 7, a power mechanism (300) provided on the surface of the mounting plate (103 c), and a water drain mechanism (400) provided on the surface of the power mechanism (300).

9. The shaft seal fan of claim 8 wherein: the power mechanism (300) comprises a driving assembly (301) arranged on the surface of the mounting disc (103 c), a connecting shaft (302) is arranged at the output end of the driving assembly (301), a fan blade (303) is arranged at one end of the connecting shaft (302), and the power mechanism further comprises a flow guiding shell (304) arranged on the surface of the mounting disc (103 c).

10. The shaft seal fan of claim 9 wherein: the drainage mechanism (400) comprises a U-shaped pipe (401) arranged on the surface of the diversion shell (304), a control valve (402) arranged on the outer wall of the U-shaped pipe (401), and a diversion groove (403) arranged on the surface of the fan blade (303);

the U-shaped pipe (401) is of a U-shaped structure.