CN220955729U - Steam passage integrated rear shaft seal body - Google Patents

Abstract

The utility model relates to the technical field of steam turbines, and provides a steam passage integrated rear shaft seal body, which comprises a shaft seal body, wherein a steam inlet pipe and a steam exhaust pipe are arranged at the bottom of the shaft seal body, the steam inlet pipe is used for adding steam into the shaft seal body, the steam exhaust pipe is used for exhausting steam in the shaft seal body, and the steam inlet pipe is communicated with the steam exhaust pipe; a first anti-overflow mechanism is arranged in a pipeline of the steam inlet pipe, and a first fixing plate for supporting the first anti-overflow mechanism is arranged in a pipe cavity of the steam inlet pipe; the steam exhaust pipe is internally provided with a second anti-overflow mechanism, the pipe cavity of the steam exhaust pipe is internally provided with a second fixing plate for supporting the second anti-overflow mechanism, and the side wall of the steam exhaust pipe is provided with a control switch for opening and closing the steam exhaust pipe. The utility model not only can solve the problem of the position limitation when the steam turbine is installed, but also can collect the steam discharged through the steam discharge pipe through the steam inlet pipe, and the functions of the first anti-overflow device and the second anti-overflow device can make full use of the steam.

Description

Steam passage integrated rear shaft seal body

Technical Field

The utility model relates to the technical field of steam turbines, in particular to a steam passage integrated rear shaft seal body.

Background

The steam turbine is mainly an external combustion rotary machine for converting steam heat energy into mechanical work in a cylinder, wherein the cylinder mainly separates a ventilation part of the steam turbine from the atmosphere, so that the steam is ensured to complete the work process in the steam turbine. When the rear shaft seal body of the cylinder is used, the steam pressure in the cylinder needs to be kept constant and circulated through the steam exhaust pipe and the steam inlet pipe in time.

The steam inlet pipe and the steam outlet pipe of the existing shaft seal body are mutually independent, so that steam in the shaft seal body is easily discharged from the steam outlet pipe directly, waste is further caused, and reverse circulation of the steam is easily caused when the steam is discharged and inlet is carried out in the shaft seal body, so that the shaft seal body is damaged.

Disclosure of utility model

The utility model aims to provide a steam passage integrated rear shaft body which can prevent the damage problem caused by reverse circulation of steam and effectively avoid the waste of the steam.

The embodiment of the utility model is realized by the following technical scheme: the steam passage integrated rear shaft seal body comprises a shaft seal body, wherein a steam inlet pipe and a steam exhaust pipe are arranged at the bottom of the shaft seal body, the steam inlet pipe is used for adding steam into the shaft seal body, the steam exhaust pipe is used for exhausting steam in the shaft seal body, and the steam inlet pipe is communicated with the steam exhaust pipe; a first anti-overflow mechanism is arranged in the pipeline of the steam inlet pipe, and a first fixing plate for supporting the first anti-overflow mechanism is arranged in the pipe cavity of the steam inlet pipe; the steam exhaust pipe is characterized in that a second anti-overflow mechanism is arranged in a pipeline of the steam exhaust pipe, a second fixing plate used for supporting the second anti-overflow mechanism is arranged in a pipe cavity of the steam exhaust pipe, and a control switch for opening and closing the steam exhaust pipe is arranged on the side wall of the steam exhaust pipe.

Preferably, the first anti-overflow mechanism comprises a first sealing cover plate, a first connecting rod and a first spring, wherein the first sealing cover plate is used for sealing a pipe orifice of the steam inlet pipe, one end of the first connecting rod is connected with the first sealing cover plate, the first connecting rod penetrates through the first fixing plate, the tail end of the first connecting rod is provided with a first limiting plate, the first spring is sleeved on the first connecting rod, and two ends of the first spring are clamped between the first fixing plate and the first limiting plate, and the opening and closing of the first sealing cover plate are controlled through the expansion of the first spring.

Preferably, the second anti-overflow mechanism comprises a second sealing cover plate, a second connecting rod and a second spring, wherein the second sealing cover plate is used for sealing a pipe orifice of the steam inlet pipe, two ends of the second connecting rod are connected with the second sealing cover plate, the second connecting rod penetrates through the second fixing plate, the tail end of the second connecting rod is provided with a second limiting plate, the second spring is sleeved on the second connecting rod, and two ends of the second spring are clamped between the second fixing plate and the second limiting plate, and the opening and closing of the second sealing cover plate are controlled through the expansion and the contraction of the second spring.

Preferably, the first sealing cover plate is arranged at the joint of the shaft seal body and the steam inlet pipe, and the second sealing cover plate is arranged at the joint of the steam inlet pipe and the steam exhaust pipe.

Preferably, the shaft seal body comprises an upper half shaft seal and a lower half shaft seal, and the upper half shaft seal is spliced with the lower half shaft seal.

Preferably, the upper half shaft seal and the lower half shaft seal are of semicircular structures, and a threaded hole which is used for being matched with a bolt to connect the upper half shaft seal with the lower half shaft seal is formed in the top end face of the lower half shaft seal.

Preferably, a plurality of separation cavities for steam flow are arranged in the lower half shaft seal, and the separation cavities are communicated with the steam inlet pipe and the steam exhaust pipe.

The technical scheme of the embodiment of the utility model has at least the following advantages and beneficial effects: according to the utility model, the steam exhaust pipe is connected with the steam inlet pipe, so that the problem of limited position during installation of the steam turbine can be solved, and steam exhausted through the steam exhaust pipe can be collected through the steam inlet pipe, so that the steam is fully utilized;

When steam is required to be added into the shaft seal body, the motor generates blowing force at the moment, so that the flow in the steam box cylinder can be accelerated; the flowing steam can cause the first overflow preventing mechanism to be opened, and after the steam is added into the shaft seal body, the first overflow preventing mechanism is closed to block the steam inlet pipe so as to prevent the steam from overflowing; when the steam in the shaft seal body needs to be discharged, the control switch can be turned on, the flowing steam can promote the second anti-overflow mechanism to be turned on, the suction force generated by the motor can also accelerate the flow of the steam, the control switch and the motor are turned off, and the second anti-overflow mechanism is driven to seal the steam discharge pipe, so that the steam inlet pipe is not hindered from adding steam into the shaft seal body.

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 embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a steam duct integrated rear shaft seal body according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of the front structure of the integrated rear shaft seal of the present utility model;

FIG. 3 is a schematic view of the lower shaft seal of the present utility model;

FIG. 4 is a partial cross-sectional view of the exhaust and intake pipes of the present utility model;

FIG. 5 is an enlarged view of a portion at A in FIG. 4;

fig. 6 is a partial enlarged view at B in fig. 4.

Icon: 100-shaft seal body, 110-upper half shaft seal, 120-lower half shaft seal, 121-threaded hole, 122-separation chamber, 200-steam inlet pipe, 210-first overflow preventing mechanism, 211-first sealing cover plate, 212-first connecting rod, 213-first spring, 214-first limiting plate, 220-first fixed plate, 300-steam exhaust pipe, 310-second fixed plate, 320-second overflow preventing mechanism, 321-second sealing cover plate, 322-second connecting rod, 323-second spring, 324-second limiting plate and 330-control switch.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

Examples

1-6, The present embodiment is a steam duct integrated rear shaft seal body 100, which comprises a shaft seal body 100, wherein a steam inlet pipe 200 and a steam outlet pipe 300 are arranged at the bottom of the shaft seal body 100, the steam inlet pipe 200 is used for adding steam into the shaft seal body 100, the steam outlet pipe 300 is used for discharging steam in the shaft seal body 100, and the steam inlet pipe 200 is communicated with the steam outlet pipe 300; a first anti-overflow mechanism 210 is arranged in the pipeline of the steam inlet pipe 200, and a first fixing plate 220 for supporting the first anti-overflow mechanism 210 is arranged in the pipe cavity of the steam inlet pipe 200; a second anti-overflow mechanism 320 is arranged in the pipeline of the steam exhaust pipe 300, a second fixing plate 310 for supporting the second anti-overflow mechanism 320 is arranged in the pipe cavity of the steam exhaust pipe 300, and a control switch 330 for opening and closing the steam exhaust pipe 300 is arranged on the side wall of the steam exhaust pipe 300; specifically, the steam inlet pipe 200 and the steam outlet pipe 300 of the existing shaft seal body 100 are used independently, so that steam in the shaft seal body 100 is easily discharged from the steam outlet pipe 300, further waste is caused, in addition, when steam is discharged and discharged from the shaft seal body 100, reverse circulation of the steam is easily caused, damage to the shaft seal body 100 is caused, in addition, when the existing steam turbine is installed, the steam inlet pipe 200 and the steam outlet pipe 300 are located on different planes, so that the installation position of the steam turbine is limited, the steam outlet pipe 300300 and the steam inlet pipe 200 of the shaft seal body 100 are required to be improved, the steam inlet pipe 200 for adding steam into the cavity of the shaft seal body 100 is arranged at the bottom end of the shaft seal body 100, the steam outlet pipe 300 for discharging the steam in the cavity of the shaft seal body 100 is arranged at the bottom end of the shaft seal body 100, and the steam outlet pipe 300 is connected with the steam inlet pipe 200, so that the steam discharged from the steam outlet pipe 300 is fully utilized, the steam outlet pipe 300 and the steam inlet pipe 200 are located on the same plane, and occupied space is reduced, and the shaft seal body 100 can be conveniently installed on the steam turbine cylinder 100.

Referring to fig. 1-3, the shaft seal body 100 in this embodiment includes an upper shaft seal 110 and a lower shaft seal 120, and the upper shaft seal 110 and the lower shaft seal 120 are spliced. The upper half shaft seal 110 and the lower half shaft seal 120 are of semicircular structures, a threaded hole 121 for connecting the upper half shaft seal 110 with the lower half shaft seal 120 in a bolt fit manner is formed in the top end surface of the lower half shaft seal 120, a plurality of separation cavities 122 for steam flow are formed in the lower half shaft seal 120, and the separation cavities 122 are communicated with the steam inlet pipe 200 and the steam exhaust pipe 300; specifically, an operator can screw the bolt into the threaded hole 121 through the upper half-shaft seal 110, and seal-connect the upper half-shaft seal 110 and the lower half-shaft seal 120, and pad a rubber ring between them, so as to avoid steam leakage.

Referring to fig. 4 and 5, the first anti-overflow mechanism 210 in this embodiment includes a first sealing cover plate 211, a first connecting rod 212 and a first spring 213, wherein the first sealing cover plate 211 is used for sealing the pipe orifice of the steam inlet pipe 200, one end of the first connecting rod 212 is connected with the first sealing cover plate 211, the first connecting rod 212 passes through the first fixing plate 220, the tail end of the first connecting rod 212 is provided with a first limiting plate 214, the first spring 213 is sleeved on the first connecting rod 212, two ends of the first spring 213 are clamped between the first fixing plate 220 and the first limiting plate 214, and the opening and closing of the first sealing cover plate 211 are controlled by the expansion and the contraction of the first spring 213; specifically, the size of the first sealing cover plate 211 is larger than the inner diameter of the steam inlet pipe 200, so that the sealing of the pipe cavity of the steam inlet pipe 200 can be facilitated, the steam can be conveniently added into the shaft seal body 100 by an operator through the steam inlet pipe 200, steam overflow is prevented from occurring when the steam is stopped to be added into the shaft seal body 100, the first sealing cover plate 211 and the first connecting rod 212 move upwards to squeeze the first spring 213, once the steam is stopped to be added into the shaft seal body 100, the first sealing cover plate 211 moves downwards under the elastic action of the first spring 213 and under the internal steam action of the shaft seal body 100, the steam inlet pipe 200 is blocked, and the steam is prevented from leaking.

Referring to fig. 4 and 6, the second anti-overflow mechanism 320 in this embodiment includes a second sealing cover plate 321, a second connecting rod 322, and a second spring 323, where the second sealing cover plate 321 is used to seal the nozzle of the steam inlet pipe 200, two ends of the second connecting rod 322 are connected to the second sealing cover plate 321, the second connecting rod 322 passes through the second fixing plate 310, the tail end of the second connecting rod 322 is provided with a second limiting plate 324, the second spring 323 is sleeved on the second connecting rod 322, and two ends of the second spring 323 are clamped between the second fixing plate 310 and the second limiting plate 324, and the opening and closing of the second sealing cover plate 321 are controlled by the expansion and contraction of the second spring 323; specifically, when the steam in the shaft seal body 100 is excessive, the control switch 330 is turned on, and the steam also synchronously turns on the second anti-overflow mechanism 320, so that the steam flows into the steam inlet pipe 2000, and at this time, the steam inlet pipe 200 collects the excessive steam into the collecting tank due to suction generated by the motor located below, and prepares for adding steam into the shaft seal body 100 next time; the side wall of the steam exhaust pipe 300 is provided with a control switch 330 which is convenient for opening and closing the steam exhaust pipe 300 to exhaust steam, so that when an operator exhausts the redundant steam in the shaft seal body 100, the control switch 330 can be used for opening, and the steam in the shaft seal body 100 can be exhausted through the steam exhaust pipe 300;

The second anti-overflow mechanism 320 comprises a second sealing cover plate 321 for sealing the pipe cavity of the steam exhaust pipe 300, wherein the second sealing cover plate 321 is positioned in the pipe cavity of the steam inlet pipe 200, and the diameter of the second sealing cover plate 321 is larger than the inner diameter of the steam exhaust pipe 300, so that the steam exhaust pipe 300 can be better sealed; to prevent steam from flowing into the steam exhaust pipe 300 when steam is added into the shaft seal body 100; the rear end face of the second sealing cover plate 321 is fixedly provided with a second connecting rod 322 for driving the second sealing cover plate 321 to move forwards and backwards, the second connecting rod 322 penetrates through the plate body of the second fixing plate 310, a second spring 323 for resetting the second connecting rod 322 is sleeved on the rod body of the second connecting rod 322, the second spring 323 is positioned at the rear side of the second fixing plate 310, the rear end face of the second connecting rod 322 is fixedly provided with a second limiting plate 324 for preventing the second connecting rod 322 from being separated from the limitation of the second fixing plate 310, so that when an operator needs to discharge steam in the shaft seal body 100, flowing steam can act on the second limiting plate 324, the second connecting rod 322 can move forwards and open the second sealing cover plate 321, when the steam in the shaft seal body 100 is proper, the discharge of the steam can be stopped, and the compressed second spring 323 can be reset to the original position and drive the second sealing cover plate 321 to seal the steam discharge pipe 300.

It should be noted that, in the present embodiment, the first sealing cover 211 is disposed at a junction between the shaft seal body 100 and the steam inlet pipe 200, and the second sealing cover 321 is disposed at a junction between the steam inlet pipe 200 and the steam outlet pipe 300.

The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (7)

1. A steam passage integrated rear shaft seal body (100), comprising a shaft seal body (100), characterized in that: the bottom of the shaft seal body (100) is provided with a steam inlet pipe (200) and a steam exhaust pipe (300), the steam inlet pipe (200) is used for adding steam into the shaft seal body (100), the steam exhaust pipe (300) is used for exhausting steam in the shaft seal body (100), and the steam inlet pipe (200) is communicated with the steam exhaust pipe (300);

a first anti-overflow mechanism (210) is arranged in a pipeline of the steam inlet pipe (200), and a first fixing plate (220) for supporting the first anti-overflow mechanism (210) is arranged in a pipe cavity of the steam inlet pipe (200);

The steam exhaust pipe is characterized in that a second anti-overflow mechanism (320) is arranged in a pipeline of the steam exhaust pipe (300), a second fixing plate (310) used for supporting the second anti-overflow mechanism (320) is arranged in a pipe cavity of the steam exhaust pipe (300), and a control switch (330) used for opening and closing the steam exhaust pipe (300) is arranged on the side wall of the steam exhaust pipe (300).

2. The steam passage integrated rear shaft seal body (100) according to claim 1, wherein: the first anti-overflow mechanism (210) comprises a first sealing cover plate (211), a first connecting rod (212) and a first spring (213), wherein the first sealing cover plate (211) is used for sealing a pipe orifice of the steam inlet pipe (200), one end of the first connecting rod (212) is connected with the first sealing cover plate (211), the first connecting rod (212) penetrates through the first fixing plate (220), a first limiting plate (214) is arranged at the tail end of the first connecting rod (212), the first spring (213) is sleeved on the first connecting rod (212), and two ends of the first spring (213) are clamped between the first fixing plate (220) and the first limiting plate (214), and the opening and closing of the first sealing cover plate (211) are controlled through the expansion of the first spring (213).

3. The steam passage integrated rear shaft seal body (100) according to claim 2, wherein: the second anti-overflow mechanism (320) comprises a second sealing cover plate (321), a second connecting rod (322) and a second spring (323), wherein the second sealing cover plate (321) is used for sealing a pipe orifice of the steam inlet pipe (200), two ends of the second connecting rod (322) are connected with the second sealing cover plate (321), the second connecting rod (322) penetrates through the second fixing plate (310), the tail end of the second connecting rod (322) is provided with a second limiting plate (324), the second spring (323) is sleeved on the second connecting rod (322), and two ends of the second spring (323) are clamped between the second fixing plate (310) and the second limiting plate (324), and the second sealing cover plate (321) is controlled to be opened and closed through expansion of the second spring (323).

4. A steam passage integrated rear shaft seal body (100) according to claim 3, characterized in that: the first sealing cover plate (211) is arranged at the joint of the shaft seal body (100) and the steam inlet pipe (200), and the second sealing cover plate (321) is arranged at the joint of the steam inlet pipe (200) and the steam exhaust pipe (300).

5. The steam passage integrated rear shaft seal body (100) according to claim 1, wherein: the shaft seal body (100) comprises an upper half shaft seal (110) and a lower half shaft seal (120), and the upper half shaft seal (110) is spliced with the lower half shaft seal (120).

6. The steam passage integrated rear shaft seal body (100) according to claim 5, wherein: the upper half shaft seal (110) and the lower half shaft seal (120) are of semicircular structures, and a threaded hole (121) used for being matched with a bolt to connect the upper half shaft seal (110) with the lower half shaft seal (120) is formed in the top end face of the lower half shaft seal (120).

7. The steam passage integrated rear shaft seal body (100) according to claim 6, wherein: the lower half shaft seal (120) is internally provided with a plurality of separation cavities (122) for steam flow, and the separation cavities (122) are communicated with the steam inlet pipe (200) and the steam exhaust pipe (300).