CN219242796U - Valve internal part structure for high-temperature high-pressure difference environment - Google Patents

Abstract

The utility model discloses a valve trim structure for a high-temperature and high-pressure difference environment, which comprises a valve seat, a labyrinth piece assembly, a sleeve assembly and a valve core assembly, wherein the valve seat, the labyrinth piece assembly and the sleeve assembly are sequentially arranged from bottom to top; the sleeve assembly comprises a main sleeve and a guide sleeve which are sequentially arranged from bottom to top, the main sleeve is provided with a runner window, the labyrinth piece assembly comprises a plurality of labyrinth pieces which are overlapped, and the labyrinth pieces are provided with labyrinth-shaped runners; the valve core assembly comprises a valve core and an auxiliary valve core, and a balance spring is arranged between the auxiliary valve core and the valve core; the auxiliary valve core is connected with the valve rod and drives the valve core to move. The utility model adopts a labyrinth piece and a combined sleeve structure, the labyrinth piece is provided with a labyrinth-shaped flow channel to realize flow regulation when the valve is at a small opening, the main sleeve is provided with a flow channel window to realize flow regulation when the valve is at a large opening, and the flow adjustable ratio of the valve is improved.

Description

Valve internal part structure for high-temperature high-pressure difference environment

Technical Field

The present disclosure relates to valve trim structures, and particularly to a valve trim structure for high temperature and pressure environments.

Background

In the fast reactor nuclear power unit, the atmospheric discharge valve has the function of discharging steam to the atmosphere through the valve when the bypass discharge system of the steam turbine fails or the discharge amount is insufficient, so that the pressure of the main steam system is limited below the tripping pressure of the safety valve, and the tripping of the safety valve is avoided. When the steam generator leaks, an atmospheric vent valve may be used to release pressure within the steam generator, i.e., vent the three-circuit side steam to atmosphere.

The atmospheric discharge valve needs to work at 530 ℃ and under the pressure difference of 16.9MPa, the required adjustable ratio is large, the V-level leakage requirement must be met, and the conventional sleeve structure cannot meet the working condition requirement; the flow is regulated by regulating the opening size of the runner window through sliding fit of the sleeve and the valve core, so that the problem of jamming in the action process of the sleeve can be solved due to larger clearance between the sleeve and the valve core, the clearance is large, the valve is slightly opened, namely, the valve has larger flow, the adjustable ratio requirement is difficult to achieve, the fit clearance is small, the adjustable ratio can be well ensured, and the jamming phenomenon between the sleeve and the valve seat is easy to occur under the high-temperature working state, so that the valve cannot work normally. Accordingly, the prior art is still in need of improvement and development.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a valve internal part structure for a high-temperature high-pressure difference environment, and solves the problems that a sleeve and a valve core of the existing valve internal part structure for the high-temperature high-pressure difference environment are easy to clamp or the flow is adjustable and smaller.

The technical scheme adopted by the utility model for solving the technical problems is to provide a valve internal part structure for a high-temperature and high-pressure difference environment, which comprises a valve seat, a labyrinth piece component, a sleeve component and a valve core component, wherein the valve seat, the labyrinth piece component and the sleeve component are sequentially arranged from bottom to top, and the valve core component is arranged in the labyrinth piece component and the sleeve component and is in sliding connection with the labyrinth piece component and the sleeve component; the labyrinth piece assembly comprises a plurality of labyrinth pieces which are overlapped, and the labyrinth pieces are provided with labyrinth-shaped runners; the valve core assembly comprises a valve core and an auxiliary valve core, the auxiliary valve core is arranged at the center of the top of the valve core, and a balance spring is arranged between the auxiliary valve core and the valve core; the auxiliary valve core is connected with the valve rod and drives the valve core to move.

Further, the labyrinth piece is annular, the labyrinth-shaped flow passage penetrates through the side wall of the labyrinth piece, the number of the labyrinth-shaped flow passages of the labyrinth piece is multiple, and the multiple labyrinth-shaped flow passages are arranged at intervals along the circumferential direction of the labyrinth piece.

Further, the labyrinth-shaped flow passage is provided with a plurality of right-angle turning positions; the area of the labyrinth-shaped flow passage gradually increases from the outer side to the inner side of the labyrinth piece.

Further, the labyrinth piece subassembly is including the first labyrinth piece and a plurality of second labyrinth piece that stack in proper order set up, first labyrinth piece sets up in the disk seat top, disk seat top inboard is provided with the boss, first labyrinth piece bottom inboard sets up the recess that matches with the boss, disk seat and first labyrinth piece pass through boss and recess matching installation.

Further, the first labyrinth piece and the second labyrinth piece are welded and connected; the second labyrinth pieces are welded and connected; the second labyrinth piece is welded with the main sleeve.

Further, the outer diameter of the top of the valve core is larger than that of the middle part, the outer diameter of the bottom of the valve core is larger than that of the middle part, the outer wall of the top of the valve core is in sliding connection with a guide sleeve, the guide sleeve is subjected to surfacing welding STL6 on the connection surface of the guide sleeve and the valve core is subjected to surfacing welding STL12 on the connection surface of the guide sleeve; the outer wall of the bottom of the valve core is in sliding connection with the labyrinth piece component and the main sleeve; a gap is formed between the outer wall of the middle part of the valve core and the main sleeve.

Further, the top of case has been seted up and has been held the chamber, supplementary case sets up in holding the chamber, balance spring sets up in holding the chamber and is located between the bottom surface and the supplementary case that hold the chamber, supplementary case passes through the cylindric lock with the valve rod and is connected, be provided with the retaining ring that stops supplementary case and shift out the chamber of holding in holding the chamber.

Further, the outer diameter of the valve core is larger than the inner diameter of the valve seat; the bottom of the outer wall of the valve core is connected with the top of the inner wall of the valve seat through an inclined plane.

Further, a sealing groove is formed in the outer wall of the valve core, and a sealing ring is arranged in the sealing groove; the valve core is in sliding sealing connection with the guide sleeve through the sealing ring.

Further, the main sleeve is connected with the guide sleeve through a pin.

Compared with the prior art, the utility model has the following beneficial effects: the valve internals structure for the high-temperature and high-pressure difference environment adopts the labyrinth piece and the combined sleeve structure, the labyrinth piece is provided with the labyrinth-shaped flow channel to realize flow regulation when the valve is at a small opening, the main sleeve is provided with the flow channel window to realize flow regulation when the valve is at a large opening, and the flow adjustable ratio of the valve is improved; the balanced valve core structure with the auxiliary valve core is adopted, and the balance spring is arranged to reduce unbalanced force, reduce the output force requirement of the driving mechanism and improve the shock resistance; the valve core sealing surface and the valve seat sealing surface are obliquely arranged, so that linear sealing of the valve core and the valve seat is realized, and the sealing performance is improved; the joint surface of the valve core and the guide sleeve is used for welding the stellite alloy, so that the movement is smoother, and the jamming is avoided.

Drawings

FIG. 1 is a schematic view of a valve trim structure for a high temperature, high pressure differential environment according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a labyrinth piece according to an embodiment of the present utility model.

In the figure:

1. a valve seat; 2. a first labyrinth piece; 3. a second labyrinth piece; 4. a valve core; 5. a balance spring; 6. a seal ring; 7. an auxiliary valve core; 8. a retainer ring; 9. a main sleeve; 10. a cylindrical pin; 11. a guide sleeve; 12. a valve stem; 13. a flow passage window; 14. labyrinth-shaped flow channels.

Detailed Description

The utility model is further described below with reference to the drawings and examples.

In the present utility model, the terms "upper", "lower", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present utility model and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations. Furthermore, the terms "mounted," "configured," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. 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 terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.

Fig. 1 is a schematic structural diagram of a valve trim for a high temperature and high pressure differential environment according to an embodiment of the present utility model.

Referring to fig. 1, a valve trim structure for a high temperature and high pressure differential environment in an embodiment of the present utility model includes a valve seat 1, a labyrinth piece assembly, a sleeve assembly and a valve core assembly, where the valve seat 1, the labyrinth piece assembly and the sleeve assembly are sequentially arranged from bottom to top, and the valve core assembly is arranged in the labyrinth piece assembly and the sleeve assembly and is slidably connected with the labyrinth piece assembly and the sleeve assembly; the sleeve assembly comprises a main sleeve 9 and a guide sleeve 11 which are sequentially arranged from bottom to top, the main sleeve 9 is provided with a runner window 13, the labyrinth piece assembly comprises a plurality of labyrinth pieces which are overlapped, and the labyrinth pieces are provided with labyrinth-shaped runners 14; the valve core assembly comprises a valve core 4 and an auxiliary valve core 7, wherein the auxiliary valve core 7 is arranged at the center of the top of the valve core 4, and a balance spring 5 is arranged between the auxiliary valve core 7 and the valve core 4; the auxiliary valve core 7 is connected with the valve rod 12 and drives the valve core 4 to move.

Specifically, the labyrinth piece subassembly is including the first labyrinth piece 2 and a plurality of second labyrinth piece 3 that stack in proper order set up, and first labyrinth piece 2 sets up in disk seat 1 top, and disk seat 1 top inboard is provided with the boss, and first labyrinth piece 2 bottom inboard sets up the recess with boss matching, and disk seat 1 passes through boss and recess matching installation with first labyrinth piece 2. The first labyrinth piece 2 and the second labyrinth piece 3 are welded and connected; the second labyrinth piece 3 is welded and connected; the second labyrinth piece 3 is welded with the main sleeve 9. The main sleeve 9 is connected with the guide sleeve 11 by a pin. The labyrinth piece adopts the multilayer mode of overlapping, and whole labyrinth piece subassembly forms overall structure through the welding, adopts brazing process, and furthest guarantees labyrinth piece dimensional accuracy and axiality after overlapping, then welds the shaping with the sleeve.

Specifically, the outer diameter of the top of the valve core 4 is larger than that of the middle, the outer diameter of the bottom of the valve core 4 is larger than that of the middle, the outer wall of the top of the valve core 4 is in sliding connection with the guide sleeve 11, the guide sleeve 11 is subjected to surfacing welding STL6 (stellite alloy) on the connection surface with the valve core 4, and the valve core 4 is subjected to surfacing welding STL12 (stellite alloy) on the connection surface of the guide sleeve 11; the outer wall of the bottom of the valve core 4 is in sliding connection with the labyrinth piece component and the main sleeve 9; a gap is formed between the outer wall of the middle part of the valve core 4 and the main sleeve 9. The sliding of the valve core component is facilitated, and the jamming is avoided.

Specifically, the top of case 4 has seted up and has held the chamber, and supplementary case 7 sets up in holding the chamber, and balanced spring 5 sets up in holding the chamber and is located between the bottom surface that holds the chamber and supplementary case 7, and supplementary case 7 passes through cylindric lock 10 with valve rod 12 to be connected, holds the chamber and is provided with the retaining ring 8 that blocks supplementary case 7 and shift out and hold the chamber. When the valve is opened, the auxiliary valve core 7 is opened first, and the acting force required for opening is smaller because the auxiliary valve core 7 has smaller structural size and small stress area. After the auxiliary valve core 7 is opened, the pressure of the upper cavity of the valve core 4 is led into the lower cavity, so that the pressure of the upper cavity and the pressure of the lower cavity of the valve core 4 are balanced, the unbalanced area of the valve core 4 is greatly reduced, the opening force of the valve core 4 is reduced, and the V-level leakage requirement can be met.

Referring to fig. 2, in the valve internal structure for a high temperature and high pressure differential environment according to the embodiment of the utility model, the labyrinth piece is annular, the labyrinth flow passages 14 penetrate through the side wall of the labyrinth piece, the labyrinth flow passages 14 of the labyrinth piece are plural, and the plural labyrinth flow passages 14 are arranged at intervals along the circumferential direction of the labyrinth piece. Preferably, the labyrinth flow channel 14 is provided with a plurality of right angle turns; the area of the labyrinth flow passage 14 gradually increases from the outside to the inside of the labyrinth piece. The labyrinth design can reduce the risk of erosion and damage of the medium to the valve internals under high pressure difference, so as to prolong the service life of the valve internals, consume energy by continuously turning right angles of the medium in the labyrinth-shaped flow channel 14, and increase the volume of the steam medium after each stage of depressurization, thus the area of the labyrinth channel is gradually enlarged according to a certain proportion. The shape, the size and the number of superimposed layers of the labyrinth piece flow channel can be determined by software simulation analysis during design.

Preferably, the outer diameter of the valve core 4 is larger than the inner diameter of the valve seat 1; the bottom of the outer wall of the valve core 4 is connected with the top of the inner wall of the valve seat 1 through an inclined plane. And linear sealing is formed, so that the sealing effect is ensured.

Preferably, the outer wall of the valve core 4 is provided with a sealing groove, and a sealing ring 6 is arranged in the sealing groove; the valve core 4 is connected with the guide sleeve 11 in a sliding and sealing way through the sealing ring 6. Ensuring the sealing effect.

The valve trim structure for the high-temperature and high-pressure difference environment provided by the embodiment of the utility model has the advantages that when in actual use: the valve rod 12 is installed in the auxiliary valve core 7 and screwed to the bottom, then the cylindrical pin 10 is inserted into the pin hole, the similarity between the two ends of the hole is ensured, and the cylindrical pin 10 is riveted firmly. The balance spring 5 is installed in the valve core 4, the auxiliary valve core 7 and valve rod 12 assembly is installed, the balance spring 5 is compressed to a proper position, and then the check ring 8 is installed. The sealing ring 6 is installed in the valve core 4, the sleeve component (the first labyrinth piece 2, the second labyrinth piece 3 and the sleeve 9 are welded into a whole before being assembled) is installed on the valve seat 1, and then the assembled valve core component is placed in the sleeve component and slowly moves downwards until the valve core 4 is in contact with the valve seat 1. Finally, the guide sleeve 11 is sleeved on the valve core assembly and slowly moves downwards until the guide sleeve 11 is in pin joint with the sleeve main sleeve 9.

The main sleeve 9 and the valve core 4 are made of ASME SA 182F 91 materials, the difference of expansion coefficients among different materials is eliminated, and the valve core 4 is overlaid with STL12 to improve hardness and enhance wear resistance. The guide sleeve 11 is overlaid with STL6 to ensure that the valve core 4 does not move when moving up and down, the gap between the valve core 4 and the main sleeve 9 is matched according to the expansion coefficient of the material, and the coaxiality of the assembled parts is ensured through precision machining so as to prevent blocking at high temperature.

The labyrinth flow passage 14 of the labyrinth piece was sized and shaped to simulate the flow of a valve using a Fluent module in ANSYS Workbench. The turbulence model selects an SST K-omega model, the coupling method of pressure and speed is selected, and 1000 steps are solved iteratively. Under the condition of meeting the high pressure difference working condition and flow rate through analysis, the number of layers of the overlapped labyrinth sheets is 17, the labyrinth-shaped flow channel 14 adopts the maximized optimization design, ensures the strength and maximizes the large flow rate, and solves the problem of small flow rate of the labyrinth sheets so as to meet the flow rate requirement of the working condition. Through various optimized combination designs, the characteristics of large adjustable ratio and excellent sealing performance under high temperature (530 ℃) and high pressure difference (16.9 MPa) are finally realized.

In summary, the valve internal structure for the high-temperature and high-pressure difference environment provided by the utility model adopts the labyrinth piece and the combined sleeve structure, the labyrinth piece is provided with the labyrinth-shaped flow channel 14, so that the flow regulation of the valve in the small opening degree is realized, the main sleeve 9 is provided with the flow channel window 13, the flow regulation of the valve in the large opening degree is realized, and the flow adjustable ratio of the valve is improved; the balance type valve core 4 structure with the auxiliary valve core 7 is adopted, the balance spring 5 is arranged to reduce unbalanced force, the output force requirement of the driving mechanism is reduced, and the anti-seismic performance is improved; the sealing surface of the valve core 4 and the sealing surface of the valve seat 1 are obliquely arranged, so that the linear sealing of the valve core 4 and the valve seat 1 is realized, and the sealing performance is improved; the joint surface of the valve core 4 and the guide sleeve 11 is made of the Butterflyalloy, so that the movement is smoother, and the jamming is avoided.

While the utility model has been described with reference to the preferred embodiments, it is not intended to limit the utility model thereto, and it is to be understood that other modifications and improvements may be made by those skilled in the art without departing from the spirit and scope of the utility model, which is therefore defined by the appended claims.

Claims (10)

1. The valve trim structure for the high-temperature and high-pressure difference environment is characterized by comprising a valve seat, a labyrinth piece assembly, a sleeve assembly and a valve core assembly, wherein the valve seat, the labyrinth piece assembly and the sleeve assembly are sequentially arranged from bottom to top, and the valve core assembly is arranged in the labyrinth piece assembly and the sleeve assembly and is in sliding connection with the labyrinth piece assembly and the sleeve assembly; the labyrinth piece assembly comprises a plurality of labyrinth pieces which are overlapped, and the labyrinth pieces are provided with labyrinth-shaped runners; the valve core assembly comprises a valve core and an auxiliary valve core, the auxiliary valve core is arranged at the center of the top of the valve core, and a balance spring is arranged between the auxiliary valve core and the valve core; the auxiliary valve core is connected with the valve rod and drives the valve core to move.

2. The valve trim structure for a high temperature, high pressure, differential environment of claim 1, wherein the labyrinth piece is annular, the labyrinth-shaped flow passage extends through a side wall of the labyrinth piece, the labyrinth-shaped flow passage of the labyrinth piece is a plurality of, and the plurality of labyrinth-shaped flow passages are arranged at intervals along a circumferential direction of the labyrinth piece.

3. The valve trim structure for use in a high temperature, high pressure differential environment as defined in claim 2, wherein said labyrinthine runner is provided with a plurality of right angle turns; the area of the labyrinth-shaped flow passage gradually increases from the outer side to the inner side of the labyrinth piece.

4. The valve trim structure for a high temperature, high pressure and differential pressure environment of claim 1, wherein the labyrinth piece assembly comprises a first labyrinth piece and a plurality of second labyrinth pieces which are stacked in sequence, the first labyrinth piece is arranged above a valve seat, a boss is arranged on the inner side of the top of the valve seat, a groove matched with the boss is arranged on the inner side of the bottom of the first labyrinth piece, and the valve seat and the first labyrinth piece are installed in a matched mode through the boss and the groove.

5. The valve trim structure for a high temperature, high pressure differential environment of claim 4, wherein the first and second labyrinth pieces are welded together; the second labyrinth pieces are welded and connected; the second labyrinth piece is welded with the main sleeve.

6. The valve trim structure for a high temperature, high pressure and differential environment of claim 1, wherein the outer diameter of the top of the spool is greater than the outer diameter of the middle, the outer diameter of the bottom of the spool is greater than the outer diameter of the middle, the outer wall of the top of the spool is slidably connected with a guide sleeve, the guide sleeve is in surfacing STL6 with the connecting surface of the spool, and the spool is in surfacing STL12 with the connecting surface of the guide sleeve; the outer wall of the bottom of the valve core is in sliding connection with the labyrinth piece component and the main sleeve; a gap is formed between the outer wall of the middle part of the valve core and the main sleeve.

7. The valve trim structure for a high temperature, high pressure and differential pressure environment of claim 1, wherein the top of the spool defines a receiving cavity, the auxiliary spool is disposed in the receiving cavity, the balance spring is disposed in the receiving cavity and between a bottom surface of the receiving cavity and the auxiliary spool, the auxiliary spool is connected to the valve stem by a cylindrical pin, and a retainer ring is disposed in the receiving cavity to block the auxiliary spool from moving out of the receiving cavity.

8. The valve trim structure for a high temperature, high pressure differential environment of claim 1, wherein an outer diameter of the valve trim is greater than an inner diameter of the valve seat; the bottom of the outer wall of the valve core is connected with the top of the inner wall of the valve seat through an inclined plane.

9. The valve trim structure for a high temperature, high pressure differential environment of claim 1, wherein the outer spool wall is provided with a seal groove, the seal groove having a seal ring disposed therein; the valve core is in sliding sealing connection with the guide sleeve through the sealing ring.

10. The valve trim structure for use in a high temperature, high pressure differential environment of claim 1, wherein the main sleeve is pinned to the guide sleeve.

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