High-pressure heater combined valve

Abstract

The invention relates to the technical field of combined valves, in particular to a high-pressure heater combined valve which comprises a valve body. The plugging piece is arranged in the valve body in a sliding manner; the sealing piece is arranged on the plugging piece and used for sealing the space between the plugging piece and the valve body; the sealing element comprises a first sealing body and a second sealing body, and accommodating spaces are formed in the first sealing body and the second sealing body; fluid applies pressure to the first sealing body and the second sealing body so that the volume of the containing space can be reduced, when the fluid flows, pressure acts on the portion between the plugging piece and the valve body, and after the pressure acts on the first sealing body and the second sealing body, the first sealing body and the second sealing body extrude so that the containing space can be reduced. And the sealing effect is improved through deformation of the first sealing body and the second sealing body, the situation that water at different temperatures enters different channels to cause the mixing phenomenon can be avoided, safe and stable operation of the unit can be guaranteed, and the operation economical efficiency of the unit is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of combined valves, and more particularly to a combined valve for a high-pressure heater. Background Art

[0002] Currently, there have been studies on the large temperature difference of feed water before and after the combined valve at the outlet of the high-pressure heater. Some literatures mainly discuss the erosion effect of high-pressure water on components such as valve cores and valve seats, and propose solutions; some literature cases propose that the reason for the large temperature difference of feed water before and after the combined valve is the assembly reason.

[0003] In actual application, the temperature deviation between the outlet water temperature of the steam cooler and the inlet water temperature of the economizer of Unit #6 in the power plant is 6.3°C, which affects the operation economy of the unit. In order to verify the accuracy of the temperature measuring points, maintenance personnel temporarily added temperature measuring elements, and the measured temperature deviation between the two places was about 5°C, so the temperature deviation actually exists.

[0004] Therefore, a study was conducted on the large temperature difference of feed water before and after the combined valve at the outlet of the high-pressure heater of Unit #6. After disassembling the inlet combined valve, it was found that the unilateral gap between the valve seat and the valve body of the upper sealing surface was 0.2 mm, and the feed water that had not been heated by the high-pressure heater directly flowed from the gap to the outlet of the combined valve, resulting in the water temperature at the inlet of the economizer being lower than the outlet temperature of the steam cooler. For a 330 MW unit, for every 1°C decrease in feed water, the coal consumption increases by 0.079 g / kwh. Calculated at 75% output, 171,180 kg of coal consumption can be saved in a year.

[0005] In order to solve the problem of the large temperature difference of feed water before and after the combined valve at the outlet of the high-pressure heater and ensure the safe and stable operation of the unit, optimizing the seal of the combined valve can effectively solve the problem of feed water leakage and improve the operation economy of the unit.

[0006] Therefore, a combined valve for a high-pressure heater is proposed. Summary of the Invention

[0007] Therefore, the technical problem to be solved by the present invention is: the large temperature difference of feed water before and after the combined valve.

[0008] The above technical problem is solved by the following technical solutions: The present invention proposes a combined valve for a high-pressure heater, including,

[0009] A valve body;

[0010] A plugging member, slidably disposed in the valve body;

[0011] A sealing member, disposed on the plugging member for sealing between the plugging member and the valve body;

[0012] The sealing member includes a first sealing body and a second sealing body, and a receiving space is provided in the first sealing body and the second sealing body;

[0013] Applying pressure to the first seal and the second seal by the fluid will cause the volume of the accommodation space to shrink.

[0014] In a preferred embodiment of the high - pressure heater interconnection valve of the present invention: There are two sealing members, and the two sealing members are symmetrically arranged on the plugging member.

[0015] In a preferred embodiment of the high - pressure heater interconnection valve of the present invention: A support member is provided in the accommodation space, and the support member is used to support the sealing member.

[0016] In a preferred embodiment of the high - pressure heater interconnection valve of the present invention: The first seal includes a first arc portion;

[0017] The second seal includes a second arc portion;

[0018] A connecting portion is provided on the first arc portion and the second arc portion, and an inlet is provided at one end of the first arc portion and the second arc portion away from the connecting portion;

[0019] The support member is a spring.

[0020] In a preferred embodiment of the high - pressure heater interconnection valve of the present invention: An annular notch is provided on the connecting portion, and a retaining ring is provided in the annular notch.

[0021] In a preferred embodiment of the high - pressure heater interconnection valve of the present invention: The first seal includes a first pleated portion and a first pressure - receiving surface provided on the first pleated portion;

[0022] The second seal includes a second pleated portion and a second pressure - receiving surface provided on the second pleated portion.

[0023] In a preferred embodiment of the high - pressure heater interconnection valve of the present invention: A first cavity is formed in the first pleated portion;

[0024] A second cavity is formed in the second pleated portion.

[0025] In a preferred embodiment of the high - pressure heater interconnection valve of the present invention: The support member includes a limit ring and an arched ring cover provided on the limit ring;

[0026] A first limit portion is provided on the first pleated portion;

[0027] A second limit portion is provided on the second pleated portion;

[0028] An arc - shaped ring strip is provided at the connection of the first pressure - receiving surface and the second pressure - receiving surface.

[0029] In a preferred embodiment of the high - pressure heater interconnection valve of the present invention: A sealing groove is provided on the plugging member;

[0030] The plugging member is provided with a protruding portion.

[0031] In a preferred embodiment of the high-pressure heater interconnecting valve of the present invention: the outer diameter of the protruding portion is greater than the inner diameter of the sealing groove, and the outer diameter of the protruding portion is less than the outer diameter of the plugging member.

[0032] The beneficial effects of the present invention are as follows: When the fluid is flowing, there will be a pressure acting between the plugging member and the valve body. After the pressure acts on the first sealing body and the second sealing body, it will cause the first sealing body and the second sealing body to be squeezed, reducing the accommodating space. Furthermore, through the deformation of the first sealing body and the second sealing body, the sealing effect is improved. Therefore, by improving the sealing effect, it is possible to prevent water at different temperatures from entering different channels and causing mixing, ensure the safe and stable operation of the unit, effectively solve the problem of feed water leakage, and improve the economic efficiency of the unit operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present invention and do not limit the present invention.

[0034] Figure 1 Shows a schematic diagram of the internal structure of the valve body of the high-pressure heater interconnecting valve.

[0035] Figure 2 Shows a schematic cross-sectional structure diagram of the high-pressure heater interconnecting valve.

[0036] Figure 3 Shows a schematic structural diagram of the first embodiment of the sealing member of the high-pressure heater interconnecting valve.

[0037] Figure 4 Shows a schematic structural diagram of the second embodiment of the sealing member of the high-pressure heater interconnecting valve.

[0038] In the figure:

[0039] 1. Valve body; 11. Sliding channel;

[0040] 2. Plugging member; 21. Sealing groove; 22. Protruding portion; 23. Sealing end;

[0041] 3. Sealing member;

[0042] 31. First sealing body; 311. First corrugated portion; 312. First pressure-receiving surface; 313. First cavity; 314. First limiting portion; 315. First arc portion;

[0043] 32. Second sealing body; 321. Second corrugated portion; 322. Second pressure-receiving surface; 323. Second cavity; 324. Second limiting portion; 325. Second arc portion;

[0044] 33. Arc-shaped ring strip;

[0045] 34. Connecting part; 341. Annular notch; 342. Retaining ring;

[0046] 4. Support member; 41. Limit ring; 42. Arch-shaped ring cover; 43. Spring;

[0047] 5. Upper plugging body; 51. Plugging end face; 52. Flow cavity;

[0048] 6. First channel;

[0049] 7. Second channel;

[0050] 8. Third channel;

[0051] A. Accommodating space; B. Inlet. Detailed implementation manner

[0052] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below in conjunction with the specific implementation manner and the accompanying drawings.

[0053] The terms used in the present invention are those general terms that are currently widely used in the art in consideration of the functions of the present invention, but these terms may change according to the intentions of those of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but based on the meanings of the terms and the overall description of the present invention.

[0054] Referring to Figures 1 to 4 , this embodiment provides a high-pressure heater union valve, including,

[0055] Valve body 1; a sliding channel 11 is provided inside the valve body 1.

[0056] Plugging member 2, slidably arranged inside the valve body 1; the plugging member 2 is slidably arranged inside the sliding channel 11.

[0057] Sealing member 3, arranged on the plugging member 2 for sealing between the plugging member 2 and the valve body 1;

[0058] The sealing member 3 includes a first sealing body 31 and a second sealing body 32, an accommodating space A is provided inside the first sealing body 31 and the second sealing body 32; the first sealing body 31 and the second sealing body 32 are connected.

[0059] Applying pressure to the first sealing body 31 and the second sealing body 32 by the fluid will cause the volume of the accommodating space A to shrink.

[0060] It should be noted that an upper plugging body 5 is provided inside the valve body 1. A plugging end face 51 is provided at the end of the upper plugging body 5, and a flow cavity 52 is provided on the surface of the upper plugging body 5. A plurality of flow cavities 52 are provided and can allow fluids to pass through.

[0061] A first channel 6, a second channel 7, and a third channel 8 are provided on the valve body 1.

[0062] Refer to Figure 1 and Figure 2 At the top and bottom of the plugging member 2 are sealing ends 23. When the sealing end 23 at the top fits on the plugging end face 51 of the upper plugging body 5, the fluid can enter the third channel 8 through the second channel 7 for transportation. The plugging member 2 blocks the flow cavity 52 on the upper plugging body 5, and the fluid cannot enter the first channel 6.

[0063] Refer to Figure 1 and Figure 2 When the sealing end 23 at the bottom of the plugging member 2 fits on the bottom sealing seat of the valve body 1, the fluid can enter the first channel 6 through the second channel 7, and the plugging member 2 blocks the second channel 7 and the third channel 8.

[0064] Whether blocking the first channel 6 or the third channel 8, when the fluid flows, there will be pressure acting between the plugging member 2 and the valve body 1. After the pressure acts on the first sealing body 31 and the second sealing body 32, it will cause the first sealing body 31 and the second sealing body 32 to be squeezed to reduce the accommodation space A, and then improve the sealing effect through the deformation of the first sealing body 31 and the second sealing body 32. Therefore, by improving the sealing effect, it is possible to avoid the mixing phenomenon caused by water at different temperatures entering different channels, ensure the safe and stable operation of the unit, effectively solve the problem of feed water leakage, and improve the economic efficiency of the unit operation.

[0065] Refer to Figure 3 or Figure 4 As an alternative embodiment:

[0066] A sealing groove 21 is provided on the plugging member 2; the sealing groove 21 is used to install the sealing member 3.

[0067] A protruding portion 22 is provided on the plugging member 2; the provision of the protruding portion 22 can limit the sealing member 3 and facilitate the overflow fluid to apply pressure to the first sealing body 31 and the second sealing body 32.

[0068] The outer diameter of the protruding portion 22 is greater than the inner diameter of the sealing groove 21, and the outer diameter of the protruding portion 22 is less than the outer diameter of the plugging member 2.

[0069] Since the outer diameter of the protruding portion 22 is larger than the inner diameter of the sealing groove 21 and the outer diameter of the protruding portion 22 is smaller than the outer diameter of the plugging member 2, after the sealing member 3 is installed, the sealing member 3 can be stuck in the sealing groove 21, and the protruding portion 22 with a relatively small outer diameter can allow fluid to enter the sealing groove 21 to apply pressure to the first sealing body 31 and the second sealing body 32.

[0070] Refer to Figure 3 or Figure 4 , as an alternative embodiment: There are two sealing members 3, and the two sealing members 3 are symmetrically arranged on the plugging member 2.

[0071] Since the two sealing members 3 are symmetrically arranged, good sealing performance can be maintained whether blocking the first channel 6 or the third channel 8.

[0072] Refer to Figure 3 or Figure 4 , as an alternative embodiment: A support member 4 is provided in the accommodation space A, and the support member 4 is used to support the sealing member 3.

[0073] The support member 4 can support the accommodation space A to facilitate maintaining its shape, and at the same time can also limit the sealing member 3 in the sealing groove 21.

[0074] Refer to Figure 4 , as an alternative embodiment: The first sealing body 31 includes a first arc portion 315;

[0075] The second sealing body 32 includes a second arc portion 325;

[0076] A connecting portion 34 is provided on the first arc portion 315 and the second arc portion 325, and an inlet B is provided at one end of the first arc portion 315 and the second arc portion 325 away from the connecting portion 34; The opening of the inlet B facilitates the installation and placement of the support member 4, and also facilitates fluid to enter the inlet B to apply pressure to the first arc portion 315 and the second arc portion 325.

[0077] The support member 4 is a spring 43. The setting of the spring 43 facilitates the deformation of the sealing member 3, facilitates the installation of the sealing member 3 in the sealing groove 21, and also facilitates the support of the accommodation space A in the sealing member 3.

[0078] An annular notch 341 is provided on the connecting portion 34, and a retaining ring 342 is provided in the annular notch 341. The setting of the retaining ring 342 is used to limit the connecting portion 34, so that the first arc portion 315 and the second arc portion 325 can still be located in the sealing groove 21 after being compressed and deformed.

[0079] When the pressure of the fluid acts on the seal 3, the fluid can enter the accommodation space A through the inlet B. The spring 43 supports the accommodation space A. As the acting pressure increases, the first arc portion 315 and the second arc portion 325 are deformed under pressure, so that the first arc portion 315 fits against the inner wall of the sliding channel 11 of the valve body 1, and the second arc portion 325 fits against the inner wall of the seal groove 21 to complete the sealing. As the pressure increases, the sealing force also increases.

[0080] Referring to Figure 3 , as an alternative embodiment: The first seal body 31 includes a first pleated portion 311 and a first pressure-receiving surface 312 provided on the first pleated portion 311;

[0081] The second seal body 32 includes a second pleated portion 321 and a second pressure-receiving surface 322 provided on the second pleated portion 321.

[0082] A first cavity 313 is formed in the first pleated portion 311;

[0083] A second cavity 323 is formed in the second pleated portion 321.

[0084] A plurality of first cavities 313 and second cavities 323 are provided. The provision of the first cavities 313 and second cavities 323 facilitates the compression deformation of the first pleated portion 311 and the second pleated portion 321, and then they fit against the inner wall of the sliding channel 11 and the inner wall of the seal groove 21.

[0085] When the pressure of the fluid acts on the seal 3, the fluid can apply pressure to the first pressure-receiving surface 312 and the second pressure-receiving surface 322, causing the first pleated portion 311 and the second pleated portion 321 to deform. The formation of the first cavities 313 and second cavities 323 can increase the degree of compressible deformation of the first pleated portion 311 and the second pleated portion 321. After the first pleated portion 311 and the second pleated portion 321 are compressed, the volume of the accommodation space A decreases. By squeezing the inner wall of the sliding channel 11 with the first pleated portion 311 and squeezing the inner wall of the seal groove 21 with the first pleated portion 311, sealing is achieved, and as the fluid pressure increases, the sealing effect will also be improved accordingly.

[0086] The support member 4 includes a limiting ring 41 and an arched ring cover 42 provided on the limiting ring 41; the limiting ring 41 can limit the seal 3, and the arched ring cover 42 can limit and support the first pleated portion 311 and the first pleated portion 311.

[0087] A first limiting portion 314 is provided on the first pleated portion 311; a second limiting portion 324 is provided on the second pleated portion 321; an arc-shaped ring strip 33 is provided at the connection of the first pressure-receiving surface 312 and the second pressure-receiving surface 322.

[0088] The arc-shaped ring strip 33 is arranged in an inclined shape towards the sealing groove 21. The arc-shaped ring strip 33 can abut against the protrusion 22. The arc-shaped ring strip 33 cooperates with the limiting ring 41 to limit the first folded portion 311 and the second folded portion 321. When sealed, the fluid pressure acts on the first pressure-receiving surface 312 and the arc-shaped ring strip 33. The arc-shaped ring strip 33 will deflect and deform, so that the fluid applies pressure to the second pressure-receiving surface 322 again. Through the deformation of the first folded portion 311 and the second folded portion 321, the sealing performance of the sealing member 2 is improved.

[0089] Finally, it should be pointed out that the methods and devices described in detail above are only examples, and those skilled in the art can modify these examples in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A high-pressure heater connecting valve, characterized in that: Comprising, Valve body (1); Blocking member (2), slidably disposed within the valve body (1); Sealing member (3), disposed on the blocking member (2) for sealing between the blocking member (2) and the valve body (1); The sealing member (3) includes a first sealing body (31) and a second sealing body (32), and an accommodation space (A) is provided within the first sealing body (31) and the second sealing body (32); Applying pressure to the first sealing body (31) and the second sealing body (32) by a fluid will cause the volume of the accommodation space (A) to decrease.

2. The combined stop valve for the high-pressure heater according to claim 1, wherein: There are two sealing members (3), and the two sealing members (3) are symmetrically disposed on the blocking member (2).

3. The combined stop valve for the high-pressure heater according to claim 1 or 2, characterized in that: A support member (4) is provided within the accommodation space (A), and the support member (4) is used to support the sealing member (3).

4. The high-pressure heater connecting valve according to claim 3, characterized in that: The first sealing body (31) includes a first arc portion (315); The second sealing body (32) includes a second arc portion (325); A connecting portion (34) is provided on the first arc portion (315) and the second arc portion (325), and an inlet (B) is provided at one end of the first arc portion (315) and the second arc portion (325) away from the connecting portion (34); The support member (4) is a spring (43).

5. The combined valve for high-pressure heaters according to claim 4, characterized in that: An annular notch (341) is provided on the connecting portion (34), and a retaining ring (342) is provided within the annular notch (341).

6. The combined stop valve for high-pressure heater according to claim 3, wherein: The first sealing body (31) includes a first pleated portion (311), and a first pressure-receiving surface (312) provided on the first pleated portion (311); The second sealing body (32) includes a second pleated portion (321), and a second pressure-receiving surface (322) provided on the second pleated portion (321).

7. The combined stop valve for the high-pressure heater according to claim 6, wherein: A first cavity (313) is formed within the first pleated portion (311); A second cavity (323) is formed within the second pleated portion (321).

8. The combined stop valve for the high-pressure heater according to claim 7, characterized in that: The support member (4) includes a limiting ring (41), and an arched ring cover (42) provided on the limiting ring (41); A first limiting portion (314) is provided on the first pleated portion (311); A second limiting portion (324) is provided on the second pleated portion (321); An arc-shaped ring strip (33) is provided at the connection between the first pressure-receiving surface (312) and the second pressure-receiving surface (322).

9. The high-pressure heater connection valve according to claim 1 or 2 or 4 or 5 or 6 or 7 or 8, characterized in that: A sealing groove (21) is provided on the blocking member (2); A protruding portion (22) is provided on the blocking member (2).

10. The combined valve for high-pressure heater according to claim 9, wherein: The outer diameter of the protruding portion (22) is greater than the inner diameter of the sealing groove (21), and the outer diameter of the protruding portion (22) is smaller than the outer diameter of the blocking member (2).

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