CN219366876U - Slide valve for steam turbine - Google Patents

Abstract

The utility model discloses a slide valve for a steam turbine, and belongs to the field of slide valves. The utility model provides a steam turbine is with slide valve, includes valve body, sliding connection be in case in the valve body and install the terminal end cover of valve body, set up the mounting groove in the end cover, it has liquid to fill in the mounting groove, still includes: the sliding rod is connected in the mounting groove in a sliding way, and the tail end of the sliding rod is fixedly connected with a reset spring; according to the utility model, the annular placing groove is formed in the outer wall of the end cover, and the sealing ring is sleeved in the annular placing groove, so that the sealing ring is tightly attached to the inner wall of the valve body, meanwhile, when the valve core in the valve body slides downwards, the sliding rod is pushed to squeeze liquid in the mounting groove, the liquid pushes the sealing ring to expand outwards, the sealing ring is tightly attached to the inner wall of the valve body, the sealing performance is further improved, and compared with the prior art, the phenomenon of oil leakage in a gap between the end cover and the valve body caused by overlarge pressure is avoided, and the use safety and reliability are further improved.

Description

Slide valve for steam turbine

Technical Field

The utility model relates to the technical field of slide valves, in particular to a slide valve for a steam turbine.

Background

The valve is mainly characterized in that the valve is a flow dividing valve which is used for controlling the position of a fluid inlet and outlet channel of a hydraulic or pneumatic device to control the flow direction of fluid by utilizing a valve core (plunger, valve clack) to slide on a sealing surface;

in the prior art, grant bulletin number: CN206448847U, authorized bulletin day: 2017.08.29 it is named a kind of turbine main valve automatic closer sliding valve cylinder end cover, it discloses the turbine main valve automatic closer sliding valve cylinder end cover, the sliding valve cylinder bottom end cover is fixed on the lower end face of the sliding valve cylinder, the sliding valve is set in the sliding valve cylinder, the sliding valve cylinder bottom end cover is equipped with the boss, the throttle hole plug of the sliding valve bottom is equipped with the throttle hole plug inner pad between the boss of the sliding valve cylinder bottom end cover, the two sides of the steel sealing ring are equipped with the groove with O-shaped sealing ring, the O-shaped sealing ring is embedded in the groove of the two sides of the steel sealing ring, the steel sealing ring is set between the bottom end face of the sliding valve cylinder and the sliding valve cylinder bottom end cover. The beneficial effects of the utility model are as follows: the problem of oil leakage of the lower end face of the sliding valve cylinder of the automatic main valve closer is thoroughly solved, potential safety hazards are eliminated, and safe operation of the steam turbine is guaranteed. The structure is simple, the manufacture is convenient, and the cost is low;

although the above patent can achieve the purpose of preventing oil leakage, the above patent may have a problem of oil leakage when the oil pressure in the spool increases, and thus the leak-proof technology of the above patent has yet to be improved.

Disclosure of Invention

The utility model aims to solve the problem that oil leakage exists when the oil pressure in a sliding valve cylinder is increased in the prior art, and provides a sliding valve for a steam turbine.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides a steam turbine is with slide valve, includes valve body, sliding connection be in case in the valve body and install the terminal end cover of valve body, set up the mounting groove in the end cover, it has liquid to fill in the mounting groove, still includes: the sliding rod is connected in the mounting groove in a sliding way, the tail end of the sliding rod is fixedly connected with a reset spring, and one end of the reset spring, which is far away from the sliding rod, is fixedly connected to the bottom wall of the mounting groove; the annular placing groove is formed in the end cover, a sealing ring is sleeved in the annular placing groove, and the sealing ring is tightly attached to the inner wall of the valve body; the channel is arranged on the end cover and is used for communicating the annular placing groove with the mounting groove.

Preferably, the liquid is hydraulic oil or lubricating oil.

In order to improve the sealing effect, preferably, the cross section of the annular placing groove is U-shaped, the cross section of the sealing ring is the same as that of the annular placing groove, and the outer wall of the sealing ring is planar.

In order to uniformly stress the sealing ring, preferably, an annular runner is arranged on the end cover, and the runner is respectively communicated with the annular placing groove and the channel.

In order to improve the sealing effect, preferably, an annular sealing strip is fixedly connected to the outer wall of the sealing ring, and a tightening groove corresponding to the annular sealing strip is formed in the inner wall of the valve body.

In order to facilitate filling or discharging of the liquid into the mounting groove, preferably, an oil filling hole is formed in the end cover, and an oil filling cover is connected in a threaded manner in the oil filling hole.

Preferably, the end cap is T-shaped and is threadedly connected in the valve body.

Compared with the prior art, the utility model provides the slide valve for the steam turbine, which has the following beneficial effects:

1. this slide valve for steam turbine extrudes the slide bar through the case gliding time, and the slide bar extrudees the liquid in the mounting groove again, and in the liquid received the extrusion back entered into the runner to promote the sealing washer outwards expansion, further make sealing washer and valve body inner wall hug closely, and then make when the case moves down for prior art, can not lead to the gap between end cover and the valve body to appear the oil leak phenomenon because of the pressure is too big.

2. This steam turbine is with slide valve through selecting the liquid to be hydraulic oil or lubricating oil, when in the mounting groove, can also lubricate the slip of slide bar, makes reset spring soak in hydraulic oil or lubricating oil simultaneously, improves reset spring's life, lubricates when reset spring atress takes place deformation simultaneously, avoids reset spring jam to lead to the case to slide unsmoothly.

The device is characterized in that the outer wall of the end cover is provided with an annular placing groove, a sealing ring is sleeved in the annular placing groove, so that the sealing ring is tightly attached to the inner wall of the valve body, meanwhile, when a valve core in the valve body slides downwards, a sliding rod is pushed to squeeze liquid in the mounting groove, the sealing ring is pushed to expand outwards by the liquid, the sealing ring is further tightly attached to the inner wall of the valve body, the sealing performance is improved, and compared with the prior art, the sealing device can not cause oil leakage phenomenon in a gap between the end cover and the valve body due to overlarge pressure, and further improves the safety and reliability of use.

Drawings

FIG. 1 is a schematic view of a spool valve for a steam turbine according to the present utility model;

FIG. 2 is a schematic view of the spool valve for steam turbine of FIG. 1A;

FIG. 3 is a schematic view of the spool valve for steam turbines according to the present utility model at B in FIG. 2;

FIG. 4 is a schematic diagram showing a second embodiment of a slide valve for a steam turbine according to the present utility model;

FIG. 5 is a schematic view of a spool valve for a steam turbine according to the present utility model;

FIG. 6 is a schematic view of an end cover of a slide valve for a steam turbine according to the present utility model;

FIG. 7 is a schematic view of the spool valve for steam turbines of FIG. 6 according to the present utility model;

FIG. 8 is a schematic view of a seal ring of a slide valve for a steam turbine according to the present utility model;

fig. 9 is a schematic structural view of a valve body of a slide valve for a steam turbine according to the present utility model.

In the figure: 1. a valve body; 11. a first interface; 12. a second interface; 13. a third interface; 14. a valve core; 2. an end cap; 21. a mounting groove; 22. a return spring; 23. a slide bar; 24. an oil filling hole; 25. an oiling cover; 3. an annular placement groove; 31. a flow passage; 32. a channel; 4. a seal ring; 41. an annular sealing strip; 42. and (5) aligning the tightening grooves.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Examples:

referring to fig. 1 to 9, a spool valve for a steam turbine includes a valve body 1, a spool 14 slidably connected to the valve body 1, and an end cap 2 mounted at the end of the valve body 1, wherein a mounting groove 21 is formed in the end cap 2, and the mounting groove 21 is filled with a liquid, and further includes: the sliding rod 23 is connected in the mounting groove 21 in a sliding way, the tail end of the sliding rod 23 is fixedly connected with the return spring 22, and one end, far away from the sliding rod 23, of the return spring 22 is fixedly connected to the bottom wall of the mounting groove 21; an annular placing groove 3 is formed in the end cover 2, a sealing ring 4 is sleeved in the annular placing groove 3, and the sealing ring 4 is tightly attached to the inner wall of the valve body 1; a channel 32 formed on the end cover 2, the channel 32 being used for communicating the annular placing groove 3 with the mounting groove 21; the liquid is hydraulic oil or lubricating oil; the cross section of the annular placing groove 3 is U-shaped, the cross section of the sealing ring 4 is the same as that of the annular placing groove 3, and the outer wall of the sealing ring 4 is planar; the end cover 2 is provided with an annular runner 31, and the runner 31 is respectively communicated with the annular placing groove 3 and the channel 32; an annular sealing strip 41 is fixedly connected to the outer wall of the sealing ring 4, and an opposite tightening groove 42 corresponding to the annular sealing strip 41 is formed in the inner wall of the valve body 1; the end cover 2 is provided with an oil filling hole 24, and an oil filling cover 25 is connected in the oil filling hole 24 in a threaded manner; the end cover 2 is T-shaped, and the end cover 2 is in threaded connection with the valve body 1;

when the device is used, the external pipeline is respectively connected with the first interface 11, the second interface 12 and the third interface 13, the first interface 11 is used for pressure relief, when the valve core 14 is pushed by external pressure, the valve core 14 moves downwards, so that the first interface 11 is blocked, the second interface 12 is opened, and the pipeline connected with the second interface 12 enters the valve body 1 and enters the pipeline of the third interface 13;

the device is mainly used for pushing the slide bar 23 by the tail end of the valve core 14 when the valve core 14 moves downwards, pushing the return spring 22 by the slide bar 23 downwards, pushing the liquid in the installation groove 21 at the same time when the slide bar 23 downwards slides, and enabling the liquid to enter the flow channel 31 through the channel 32 after being pushed, so that the flow channel 31 is filled with the liquid, the liquid is continuously pushed, the liquid pressure is gradually increased, the annular flow channel 31 is uniformly stressed to push the sealing ring 4 to expand outwards, the sealing ring 4 is further tightly attached to the inner wall of the valve body 1, and further compared with the prior art, when the valve core 14 moves downwards, the phenomenon of oil leakage in a gap between the end cover 2 and the valve body 1 caused by overlarge pressure is avoided;

when the sealing ring 4 is pushed by liquid to start expanding, the annular sealing strip 41 on the outer wall of the sealing ring 4 is further tightly attached to the tightening groove 42 and is filled in the tightening groove 42, so that the end cover 2 is further tightly attached to the inner wall of the valve body 1, and oil seepage and oil leakage are prevented;

it should be understood that the sealing ring 4 and the annular sealing strip 41 are made of rubber, have elasticity and scalability, and meanwhile, the sealing ring 4 is sleeved in the annular placing groove 3, so that the sealing ring 4 is tightly filled and cannot be thinned due to outward expansion of the sealing ring 4;

because the liquid is hydraulic oil or lubricating oil, when the liquid is in the mounting groove 21, the sliding of the sliding rod 23 can be lubricated, meanwhile, the return spring 22 is immersed in the hydraulic oil or the lubricating oil, the service life of the return spring 22 is prolonged, and meanwhile, when the return spring 22 is stressed to deform, the lubrication is carried out, so that the phenomenon that the valve core 14 slides unsmoothly due to the clamping of the return spring 22 is avoided;

the oil filling hole 24 can facilitate filling or removing liquid into or from the mounting groove 21, thereby improving convenience in use.

According to the utility model, the annular placing groove 3 is formed in the outer wall of the end cover 2, and the sealing ring 4 is sleeved in the annular placing groove, so that the sealing ring 4 is tightly attached to the inner wall of the valve body 1, meanwhile, when the valve core 14 in the valve body 1 slides downwards, the sliding rod 23 is pushed to squeeze liquid in the mounting groove 21, the liquid pushes the sealing ring 4 to expand outwards, the sealing ring is tightly attached to the inner wall of the valve body 1, the sealing performance is further improved, and compared with the prior art, the oil leakage phenomenon of a gap between the end cover 2 and the valve body 1 caused by overlarge pressure can be avoided, and the use safety and reliability are further improved.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims (7)

1. The utility model provides a steam turbine is with slide valve, includes valve body (1), sliding connection valve core (14) in valve body (1) and install end cover (2) at valve body (1) end, its characterized in that, install mounting groove (21) in end cover (2), it has liquid to fill in mounting groove (21), still includes:

the sliding rod (23) is connected in the mounting groove (21) in a sliding way, the tail end of the sliding rod (23) is fixedly connected with the return spring (22), and one end, far away from the sliding rod (23), of the return spring (22) is fixedly connected to the bottom wall of the mounting groove (21);

an annular placing groove (3) is formed in the end cover (2), a sealing ring (4) is sleeved in the annular placing groove (3), and the sealing ring (4) is tightly attached to the inner wall of the valve body (1);

and the channel (32) is arranged on the end cover (2), and the channel (32) is used for communicating the annular placing groove (3) with the mounting groove (21).

2. The spool valve for steam turbines according to claim 1, wherein said fluid is hydraulic oil or lubricating oil.

3. The sliding valve for the steam turbine according to claim 1, wherein the cross section of the annular placing groove (3) is U-shaped, the cross section of the sealing ring (4) is the same as that of the annular placing groove (3), and the outer wall of the sealing ring (4) is planar.

4. A slide valve for a steam turbine according to claim 3, wherein the end cover (2) is provided with an annular runner (31), and the runner (31) is respectively communicated with the annular placing groove (3) and the channel (32).

5. The sliding valve for the steam turbine according to claim 4, wherein an annular sealing strip (41) is fixedly connected to the outer wall of the sealing ring (4), and a tightening groove (42) corresponding to the annular sealing strip (41) is formed in the inner wall of the valve body (1).

6. The slide valve for the steam turbine according to claim 1, wherein the end cover (2) is provided with an oil filling hole (24), and an oil filling cover (25) is connected in the oil filling hole (24) in a threaded manner.

7. A valve spool for a steam turbine according to claim 1, characterized in that the end cap (2) is T-shaped, the end cap (2) being screwed into the valve body (1).