CN222836260U - Steam bypass valve - Google Patents

Abstract

The utility model discloses a steam bypass valve which comprises a valve body, a valve cage, a valve core assembly, a fastening assembly and a fastening assembly, wherein a medium inlet and a medium outlet are formed in the valve body, the valve cage is arranged at a position, corresponding to the medium inlet, in the valve body in a matched mode, a flow passage for allowing a medium to flow into the valve cage from the medium inlet is formed in the valve cage, the valve core assembly is arranged in the valve cage in a matched mode, the valve core assembly is matched with the valve cage to control the medium to flow from the medium inlet to the medium outlet, and the fastening assembly comprises a valve cover, a compression flange and a four-way ring which are arranged in the valve body in a matched mode. Through the structural design of the steam bypass valve, the steam bypass valve can realize long-time and reliable operation under the medium pressure of 32MPa and the medium temperature exceeding 625 ℃, and can well meet the use requirements of the coal-fired steam turbine set under the actual working conditions of gradually rising working parameters such as pressure, temperature, flow and the like of the steam medium.

Description

Steam bypass valve

Technical Field

The utility model belongs to the technical field of valves, and particularly relates to a steam bypass valve.

Background

In the operation process of the coal-fired unit steam turbine system, steam is used as a working medium for system operation, and the operation parameters of the steam are also adjusted along with the change of working condition loads. The steam bypass valve is a key auxiliary equipment for adjusting parameters of the steam turbine, and has high requirements on tightness of a switch, running stability, reliability between component connection, accuracy of adjustment and the like.

The existing bypass valve is usually installed in a welding or threaded connection fastening mode, the welding and connection mode can cause extremely inconvenient maintenance, threads are easily oxidized when exposed to a high-temperature environment in the threaded connection fastening mode, and under the long-period action of a high-temperature medium, a bolt is easily fatigued or even fails, so that serious potential safety hazards are brought to the use of the bypass valve. Meanwhile, the installation cooperation among parts in the bypass valve directly influences the service performance of the bypass valve.

The problems are commonly existed in the conventional steam bypass valve, and with the upgrading and updating of parameters of the coal-fired turbine unit, working parameters such as pressure, temperature, flow and the like of a steam medium are gradually increased, the adjusting range is wider, and higher requirements are provided for the stable and reliable operation of the steam bypass valve.

Disclosure of utility model

The utility model aims to provide a steam bypass valve so as to meet the requirements of a coal-fired steam turbine unit on the stability and reliability of the steam bypass valve in long-period operation.

The utility model is realized by the following technical scheme:

A steam bypass valve, comprising:

The valve body is provided with a medium inlet and a medium outlet;

The valve cage is arranged at a position corresponding to the medium inlet in the valve body in a matched mode, and a flow passage through which the medium flows into the valve cage from the medium inlet is arranged on the valve cage;

The valve core assembly is arranged in the valve cage in a matched mode, and is matched with the valve cage to control the medium to circulate from the medium inlet to the medium outlet;

The valve cage comprises a valve body, a valve cover, a compression flange and four closing rings, wherein the valve cover is arranged in the valve body in a matched mode, the valve cover is arranged at the upper end of the valve cage and matched with the end face of the upper end of the valve cage, the compression flange is arranged between the valve cover and the four closing rings, the four closing rings are matched with the compression flange to limit the compression flange to move towards the direction away from the valve cover, an adjusting component is arranged between the compression flange and the valve cover, and the adjusting component is used for applying acting force in the opposite direction between the compression flange and the valve cover, so that the valve cover can compress and fix the valve cage in the valve body.

In some embodiments, the valve cartridge assembly includes:

The main valve core is of a hollow structure, and a valve core channel is arranged at one end of the main valve core;

The pre-opening valve core is arranged in the main valve core in a matched mode and can move along the axial direction of the main valve core, the pre-opening valve core comprises a valve core body, a valve rod arranged at one end of the valve core body and a valve core plunger arranged at the other end of the valve core body, the valve core plunger is matched with a valve core channel and can control medium to circulate through the valve core channel, and a balance flow channel for the medium to flow from one end of the valve core body to the other end of the valve core body is arranged on the valve core body along the axial direction of the valve core body;

the auxiliary four-way ring is arranged in the main valve core and used for limiting the movement of the pre-opening valve core in the direction away from the valve core channel;

And the disc spring component is arranged between the main valve core and the pre-opening valve core and provides acting force for the pre-opening valve core to move towards the direction far away from the valve core channel.

In some embodiments, a positioning gland is disposed within the valve body above the tetrad ring, the positioning gland engaging with and pressing against the tetrad ring inner cavity.

In some embodiments, the adjustment assembly includes a plurality of adjustment screws that are threadably coupled to the compression flange and enable one end of the adjustment screws to be tightened against the valve housing.

In some embodiments, a valve core auxiliary sealing surface is arranged on the main valve core at a valve core channel position, and a plunger piston sealing surface matched with the valve core auxiliary sealing surface is arranged on the valve core plunger.

In some embodiments, the valve stem extends through the valve housing and out of the valve body, and an leak-proof seal is disposed between the valve stem and the valve housing.

In some embodiments, the cage includes a cage body and a valve seat for mating with the valve body, the cage body and valve seat being of unitary molded construction.

In some embodiments, a valve seat sealing surface is provided on the valve seat, and a main valve element sealing surface is provided on the valve element assembly, which is matched with the valve seat sealing surface.

In some embodiments, a silencing cage is disposed at a medium outlet position in the valve body, the silencing cage is disposed at one end of the valve cage and is communicated with the valve cage, so that medium flowing out of the valve cage flows into the silencing cage, and a silencing channel for medium to flow out is disposed on the silencing cage.

In some embodiments, the cage and the sound attenuation cage are configured to have a spherical fit at the ends.

Compared with the prior art, the utility model has the following advantages:

1) The steam bypass valve adopts a modular stacking structural design and adopts a snap-in connection mode of four-closed rings, so that the installation and maintenance difficulty of the steam bypass valve is reduced, and the maintenance convenience of the steam bypass valve is improved.

2) The fastening connection mode of the four-closed ring is adopted, so that the problems that the traditional bolt connection is easy to fatigue and lose efficacy when being subjected to the action of tensile stress under the working condition of high temperature and high pressure in a circulation period are solved, the stability of the structural position of an internal part of the bypass valve in the long-period operation can be ensured, and the reliability and the good sealing performance of the long-period operation of the steam bypass valve are improved.

3) The valve cage adopts an integrated structure, so that the problem of assembly shaft heart shape position deviation caused by a conventional split structure is solved, and the coaxiality between the valve cage and the valve body is well ensured.

4) The valve cage and the silencing cage are matched by adopting spherical surfaces, so that the deviation of the valve body mounting surface and the axial lead of the valve body mounting surface in the perpendicularity can be automatically adapted during assembly, and good matching can be formed between the valve cage and the silencing cage, and the sealing performance of the steam bypass valve is ensured.

5) Through the structural design of the steam bypass valve and the combination of proper material selection, the steam bypass valve can realize long-time and reliable operation under the medium pressure of 32MPa and the medium temperature exceeding 625 ℃, and can well meet the use requirements of the coal-fired steam turbine unit under the actual working conditions such as gradually rising working parameters such as pressure, temperature, flow and the like of the steam medium.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly describe the drawings in the embodiments, it being understood that the following drawings only illustrate some embodiments of the present utility model and should not be considered as limiting the scope, and that 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 diagram of a steam bypass valve according to an embodiment of the present utility model.

Fig. 2 is a schematic view of a fastening assembly according to an embodiment of the present utility model.

Fig. 3 is a schematic diagram of a tetra-ring structure according to an embodiment of the utility model.

Fig. 4 is a schematic structural diagram of a valve core assembly according to an embodiment of the present utility model.

FIG. 5 is a schematic view of a cage according to an embodiment of the present utility model.

FIG. 6 is a schematic illustration of the mating structure between a cage and a muffler cage in an embodiment of the present utility model.

Wherein:

10. The valve body, 11, medium inlet, 12, medium outlet, 13, valve body mount pad;

20. A cage 21, a cage body 22, a valve seat 221, a valve seat sealing surface 23, and a flow passage;

30. Valve core assembly, 31, main valve core, 311, valve core channel, 312, valve core main sealing surface, 313, valve core auxiliary sealing surface, 32, pre-opening valve core, 321, valve core body, 322, valve rod, 323, valve core plunger, 3231, plunger sealing surface, 33, auxiliary four-way ring, 34 and disc spring assembly;

40. The valve cover comprises a fastening component 41, a valve cover 42, a compression flange 43, four-closed rings 431, four-closed ring petals 44, an adjusting screw 45 and a positioning gland;

50. a silencing cage 51 and a silencing channel.

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.

Referring to fig. 1 and 2, in some embodiments of the present utility model, a steam bypass valve includes a valve body 10, and a cage 20, a spool assembly 30, and a fastening assembly 40 disposed within the valve body.

The valve body 10 serves as a carrier of the steam bypass valve, the interior of the valve body is provided with a hollow structure, and a medium inlet 11 and a medium outlet 12 are provided on the valve body.

The cage 20 is disposed in the valve body at a position corresponding to the medium inlet, and a passage 23 through which the medium flows from the medium inlet into the cage is provided in the cage 20. As shown in FIG. 1, two ends of the valve cage are respectively matched with the inner cavity of the valve body, are arranged between the medium inlet and the medium outlet, and are matched with the valve core assembly to realize the switching control of the steam bypass valve.

The valve core assembly 30 is cooperatively disposed within the cage 20 and cooperates therewith for controlling the flow of media from the media inlet to the media outlet. Taking the valve core assembly structure in fig. 1 as an example, when the valve core assembly moves to the position of the flow passage, the flow passage can be blocked, so that a medium cannot enter the valve cage, and the steam bypass valve is closed through the sealing fit between the valve core assembly and the outlet at the lower end of the valve cage, and when the valve core assembly moves upwards, the medium can enter the valve cage and flow out from the medium outlet to open the steam bypass valve when the valve core assembly moves upwards and the blocking of the flow passage is removed.

Referring to fig. 2, the fastening assembly 40 includes a valve housing 41, a compression flange 42 and a tetrad ring 43, which are cooperatively disposed in the valve body, the valve housing 41 is disposed at an upper end of the valve cage 20 and is cooperatively disposed with an upper end surface of the valve cage, the compression flange 42 is disposed between the valve housing 41 and the tetrad ring 43, the compression flange 43 and the compression flange 42 are cooperatively restricted from moving in a direction away from the valve housing, and an adjusting assembly is disposed between the compression flange 42 and the valve housing 41, and is used for applying a force in a relative direction between the compression flange and the valve housing, so that the valve cage can be compressed and fixed in the valve body by the valve housing.

The fastening assembly adopts a mode of combining the valve cover, the compression flange and the four-closed ring, and utilizes the structural characteristics of the four-closed ring to apply a downward acting force to the valve cover and a stable compression acting force to the valve cage. The fastening assembly is simple in integral structure, improves the stability of the bypass valve structure, and can facilitate maintenance of the bypass valve based on the characteristic of four-closed-ring installation.

In some embodiments, the adjustment assembly includes a plurality of adjustment screws 44, the threaded connection between the adjustment screws 44 and the compression flange 42 enabling one end of the adjustment screws to be tightened against the valve housing 41. The valve cage pressing force of the valve cover on different positions can be adjusted through the adjusting screw, and the force is transmitted to the four-closing ring through the pressing flange, so that the four-closing ring can uniformly bear the acting force of the medium on the valve cover and press the valve cage.

In some embodiments, a locating gland 45 is disposed within the valve body 10 above the tetrad ring, the locating gland 45 engaging the inner cavity of the tetrad ring 43 and pressing against the tetrad ring 43. Referring to fig. 3, the four-way ring 43 generally comprises two sets of four-way ring flaps 431, which, when installed, are each nested within a corresponding annular groove in the valve body to form a four-way ring. Through the cooperation between locating gland and the tetrad ring inner chamber, can prevent that tetrad ring from taking place to loosen in the mounted position.

In some embodiments, referring to fig. 4, the spool assembly includes:

The main valve core 31, the main valve core 31 is of a hollow structure, a valve core channel 311 is arranged at one end of the main valve core 31, and medium can enter the main valve core through the valve core channel.

The valve comprises a main valve core 32, a pre-opening valve core 32, wherein the pre-opening valve core 32 is arranged in the main valve core in a matched mode and can move along the axial direction of the main valve core, the pre-opening valve core 32 comprises a valve core body 321, a valve rod 322 arranged at one end of the valve core body and a valve core plunger 323 arranged at the other end of the valve core body, the valve core plunger 323 is matched with a valve core channel 311 and can control medium to circulate through the valve core channel, and a balance flow channel (not shown in the figure) for enabling the medium to flow from one end of the valve core body to the other end is arranged on the valve core body 321 along the axial direction of the valve core body.

And a secondary tetrad ring 33, wherein the secondary tetrad ring 33 is arranged in the main valve core 31 and used for limiting the movement of the pre-opening valve core in the direction away from the valve core channel. The structure adopted by the auxiliary four-way ring is the same as that of the four-way ring, and the installation mode of the auxiliary four-way ring on the main valve core is basically the same as that of the four-way ring on the valve body. When the steam bypass valve is opened, the valve rod is operated to enable the pre-opening valve core to move in a direction far away from the valve core channel, and when the pre-opening valve core moves to a position where the auxiliary four-way ring is located, the main valve core is driven to move in an opening direction through cooperation between the pre-opening valve core and the auxiliary four-way ring, so that the steam bypass valve is opened.

The disc spring assembly 34 is arranged between the main valve core 31 and the pre-opening valve core 32, and provides a force for moving the pre-opening valve core in a direction away from the valve core channel. Disc spring assembly 34 includes one or more disc springs arranged in a stack.

The balancing flow passage on the pre-opening valve core can be a groove arranged on the circumferential surface of the valve core body along the axial direction of the valve core body or a through hole arranged on the valve core body. When the steam bypass valve is opened and closed through the valve core assembly, the pressure on two sides of the valve core assembly during the opening and closing operation can be balanced well due to the cooperation between the pre-opening valve core and the main valve core and the arrangement of the balance flow channel on the pre-opening valve core, so that the operation of the steam bypass valve is facilitated.

In some embodiments, a spool sub-sealing surface 313 is provided on main spool 31 at the spool passage position, and a spool sealing surface 3231 is provided on spool 323 that mates with the spool sub-sealing surface. The medium is shut off through the valve core channel by the cooperation between the valve core auxiliary sealing surface and the plunger sealing surface, so that a good sealing effect is formed in the valve core assembly.

In some embodiments, the valve stem 322 passes through the valve housing 41 and protrudes out of the valve body 10, and an anti-leak seal is provided between the valve stem 322 and the valve housing 41 to enable mating arrangement of the valve cartridge assembly within the valve body and the valve housing.

In the existing bypass valve, a split type structure is generally adopted for the valve cage and the valve seat, the shape and position relationship of the valve cage and the valve seat are difficult to ensure during assembly due to the influence of machining precision, and particularly when a valve seat mounting hole on a valve body is deformed, the series of parts taking the valve cage and the valve seat as mounting references in the bypass valve are misplaced, and the assembling positions of the valve cage and the valve seat cannot be corrected due to rigid connection, so that leakage is very easy to occur.

In view of the above problems, in some embodiments, referring to fig. 5, the cage 20 includes a cage body 21 and a valve seat 22 for cooperation with a valve body, the cage body 21 and the valve seat 22 being of an integrally formed structure, such that the cage is of a unitary structure to solve the problems of the split structure.

The valve seat 22 is provided with a valve seat sealing surface 221, the main valve core 21 of the valve core assembly is provided with a valve core main sealing surface 312 matched with the valve seat sealing surface, and good sealing performance of the steam bypass valve during shutdown can be ensured through the matching between the valve seat sealing surface and the valve core main sealing surface.

In some embodiments, a silencing cage 50 is disposed at a medium outlet position in the valve body, the silencing cage 50 is disposed at one end of the valve cage and is communicated with the valve cage, so that medium flowing out of the valve cage flows into the silencing cage, a silencing channel 51 for medium to flow out is disposed on the silencing cage, and the medium flows out of the medium outlet through the silencing channel. By arranging the silencing channel on the silencing cage, the silencing cage has the function of eliminating noise generated by medium flow in the operation of the steam bypass valve.

In some embodiments, the cage 20 and the sound attenuating cage 50 are configured with a spherical fit at the ends. Referring to fig. 6, the mating end surface of the end portion of the cage 20 is provided as a concave spherical surface, and the mating end surface of the end portion of the muffler cage 50 is provided as a convex spherical surface. In the assembly structure of the steam bypass valve, the silencing cage is arranged in the valve body and is in limit fit installation through a bulge arranged at the end part of the silencing cage and the valve body upper valve body mounting seat 13, and the valve body mounting surface and the valve body axis perpendicularity deviation can be automatically adapted during assembly due to spherical fit between the valve cage and the silencing cage, so that the coaxiality of the valve cage in the valve body can be well ensured, and the service performance of the steam bypass valve is ensured.

In the description of the present utility model, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are used to indicate orientations or positional relationships based on those shown in the drawings, or those that are conventionally put in use in the product of the present utility model, they are merely used to facilitate description of the present utility model and simplify description, and do not indicate or imply that the apparatus 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.

Furthermore, the terms "horizontal," "vertical," and the like in the description of the present utility model, if any, do not denote absolute levels or overhangs, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or in communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present utility model fall within the scope of the present utility model.

Claims (10)

1. A steam bypass valve, comprising:

The valve body is provided with a medium inlet and a medium outlet;

The valve cage is arranged at a position corresponding to the medium inlet in the valve body in a matched mode, and a flow passage through which the medium flows into the valve cage from the medium inlet is arranged on the valve cage;

The valve core assembly is arranged in the valve cage in a matched mode, and is matched with the valve cage to control the medium to circulate from the medium inlet to the medium outlet;

The valve cage comprises a valve body, a valve cover, a compression flange and four closing rings, wherein the valve cover is arranged in the valve body in a matched mode, the valve cover is arranged at the upper end of the valve cage and matched with the end face of the upper end of the valve cage, the compression flange is arranged between the valve cover and the four closing rings, the four closing rings are matched with the compression flange to limit the compression flange to move towards the direction away from the valve cover, an adjusting component is arranged between the compression flange and the valve cover, and the adjusting component is used for applying acting force in the opposite direction between the compression flange and the valve cover, so that the valve cover can compress and fix the valve cage in the valve body.

2. The steam bypass valve of claim 1, wherein the spool assembly includes:

The main valve core is of a hollow structure, and a valve core channel is arranged at one end of the main valve core;

The pre-opening valve core is arranged in the main valve core in a matched mode and can move along the axial direction of the main valve core, the pre-opening valve core comprises a valve core body, a valve rod arranged at one end of the valve core body and a valve core plunger arranged at the other end of the valve core body, the valve core plunger is matched with a valve core channel and can control medium to circulate through the valve core channel, and a balance flow channel for the medium to flow from one end of the valve core body to the other end of the valve core body is arranged on the valve core body along the axial direction of the valve core body;

the auxiliary four-way ring is arranged in the main valve core and used for limiting the movement of the pre-opening valve core in the direction away from the valve core channel;

And the disc spring component is arranged between the main valve core and the pre-opening valve core and provides acting force for the pre-opening valve core to move towards the direction far away from the valve core channel.

3. The steam bypass valve of claim 1, wherein a locating gland is disposed within the valve body above the tetrad ring, the locating gland engaging the tetrad ring inner cavity and compressing against the tetrad ring.

4. The steam bypass valve of claim 1, wherein the adjustment assembly includes a plurality of adjustment screws threadably coupled to the compression flange and having one end of the adjustment screws capable of abutting against the valve housing.

5. The vapor bypass valve of claim 2, wherein a spool secondary sealing surface is provided on the main spool at a spool passage location, and a spool sealing surface is provided on the spool plunger that mates with the spool secondary sealing surface.

6. The steam bypass valve of claim 2, wherein the valve stem extends through the valve housing and out of the valve body, and an leak-proof seal is disposed between the valve stem and the valve housing.

7. The steam bypass valve of claim 1, wherein the cage includes a cage body and a valve seat for mating with the valve body, the cage body and valve seat being of unitary molded construction.

8. The steam bypass valve of claim 7, wherein the valve seat has a valve seat sealing surface and the valve cartridge assembly has a valve cartridge main sealing surface that mates with the valve seat sealing surface.

9. The steam bypass valve according to claim 1 or 7, wherein a silencing cage is provided at a medium outlet position in the valve body, the silencing cage is provided at one end of the valve cage and is communicated with the valve cage, so that a medium flowing out of the valve cage flows into the silencing cage, and a silencing channel for the medium to flow out is provided on the silencing cage.

10. The steam bypass valve of claim 9, wherein the cage and the muffler cage are configured to form a spherical fit at an end.