Exhaust valve

Abstract

The utility model discloses an exhaust valve, and relates to the technical field of valves. The valve body is provided with a medium inlet and a medium outlet; the valve seat assembly is arranged at the medium outlet; the valve deck assembly is detachably connected to the top of the valve body, and one end of the valve deck assembly extends into an inner cavity of the valve body. The sealing assembly is connected to the top of the valve deck assembly, and one end of the sealing assembly extends into an inner cavity of the valve deck assembly. One end of the valve rod sequentially penetrates through the sealing assembly and the valve deck assembly, extends into an inner cavity of the valve body and is connected with the valve element. A first sealing part is arranged on the outer wall of the valve element, and a second sealing part is arranged on the inner wall of the valve seat assembly. The buffer pipe assembly is connected to a medium outlet of the valve body, and a ceramic lining is arranged on the circulation inner wall of the buffer pipe assembly. The pneumatic device is connected to one end of the valve rod away from the spool. According to the invention, the maintenance period of the exhaust valve is prolonged, the continuity and stability of equipment operation are improved, and the maintenance cost and the productivity loss are effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to an exhaust valve. BACKGROUND

[0002] The high-pressure exhaust valve is a key component in the pipeline system of the fields of mineral smelting, water treatment, seawater desalination, energy and power, and chemical process industry, and is mainly used for adjusting gas discharge, maintaining system pressure balance, and ensuring safe operation of the pipeline. However, in harsh working conditions such as wet smelting, the medium usually has the characteristics of high temperature, high pressure, strong corrosion, and contains solid particles.

[0003] At present, the conventional exhaust valve usually uses metal material as the inner part (such as valve core and valve seat). Under the continuous scouring of high-speed fluid containing solid particles, these metal sealing surfaces are easily worn and eroded, leading to sealing failure and causing leakage. At the same time, high temperature and corrosive medium also accelerate the corrosion and aging of the internal components of the valve body. These problems directly lead to a significant reduction in the service life of the valve under harsh working conditions, and the replacement frequency of internal parts is high. Due to the complex structure of the valve, it is difficult to disassemble and replace, which not only increases the maintenance cost, but also seriously affects the continuity and stability of the production process, causing loss of production capacity. CONTENT OF THE INVENTION

[0004] The embodiment of the present application provides an exhaust valve, which solves the problems in the background art.

[0005] The embodiment of the present application provides an exhaust valve, which solves the problems in the background art. The embodiment of the present application provides an exhaust valve, which solves the problems in the background art.

[0006] In a possible implementation, the valve core is in a reverse conical structure away from the end of the valve rod.

[0007] In a possible implementation, the part of the valve rod in the inner cavity of the valve body is provided with a reverse sealing boss; when the valve rod drives the valve core to move to the fully open position, the reverse sealing boss abuts against the bottom of the valve cover assembly to form a reverse sealing pair to block the medium flow to the sealing assembly.

[0008] In a possible implementation, the exhaust valve further comprises a swirl noise reduction plate; the swirl noise reduction plate is arranged between the buffer pipe assembly and the medium outlet, and is made of ceramic material.

[0009] In a possible implementation, the ceramic lining of the buffer pipe assembly comprises a first ceramic piece and a second ceramic piece arranged in sequence along the medium flow direction; the first ceramic piece is connected to the bottom of the valve seat assembly, and the cross-sectional area of the flow passage of the second ceramic piece gradually increases along the medium flow direction.

[0010] In a possible implementation, the sealing assembly comprises a stuffing box and an elastic loading device; the stuffing box is arranged in the inner cavity of the valve cover assembly and surrounds the outer wall of the valve rod; the elastic loading device is arranged at the top of the stuffing box and is used to apply a continuous axial compression force to the stuffing box.

[0011] In a possible implementation, the elastic loading device comprises a stuffing plate, a stuffing sleeve, a stud, a nut and a disc spring set; one end of the stuffing sleeve extends into the valve cover assembly and is pressed against the top of the stuffing box; the stuffing plate is arranged at the top of the stuffing sleeve; one end of the stud is fixed to the valve cover assembly, and the other end is sequentially connected to the nut after passing through the stuffing plate and the disc spring set; the elastic restoring force of the disc spring set continuously acts on the stuffing box through the stuffing plate and the stuffing sleeve by compressing the disc spring set through the nut.

[0012] In a possible implementation, the packing gland comprises, from bottom to top, a first sealing structure, a second sealing structure and a third sealing structure; the first sealing structure is close to the inner cavity of the valve body and comprises, from bottom to top, a first graphite woven packing, a graphite packing and a guide sleeve, for realizing high-temperature sealing and guiding the valve rod; the second sealing structure comprises a second graphite woven packing arranged at the top of the guide sleeve and a spacer sleeve arranged at the top of the second graphite woven packing, for auxiliary sealing and blocking heat transfer; the third sealing structure comprises, from bottom to top, a flushing sleeve, a wedge-shaped sealing ring and a fluorinated ethylene propylene end ring, for realizing dynamic sealing and preventing medium corrosion; the flushing sleeve is connected to the top of the spacer sleeve, and the fluorinated ethylene propylene end ring is connected to the bottom of the packing pressing sleeve.

[0013] In a possible implementation, the valve cover assembly comprises a valve cover body and a valve cover flange; the valve cover flange is detachably connected between the valve body and the valve cover body, and the valve cover flange is made of stainless steel.

[0014] The one or more technical solutions provided in the embodiments of the present application have at least the following technical effects:

[0015] The exhaust valve provided in the embodiments of the present application comprises a valve body, a valve seat assembly, a valve cover assembly, a valve core, a valve rod, a pneumatic device, a buffer pipe assembly and a sealing assembly. The valve rod is driven to move linearly by the pneumatic device, and the first conical surface structure of the valve core and the second conical surface structure of the valve seat assembly are tightly combined or separated, so that the opening and closing of the exhaust valve are realized. The key components such as the valve core, the first sealing part, the second sealing part and the flow passage inner wall of the buffer pipe assembly are all upgraded to ceramic materials, and a full-flow ceramic protection system is constructed. The design not only fundamentally avoids the direct contact between metal and harsh medium, but also enables the conical surface hard sealing pair to realize reliable sealing in the working condition containing fine solid particles. Therefore, the technical problems of short service life and frequent leakage of the traditional exhaust valve in harsh environments such as wet metallurgy are overcome, the maintenance period is prolonged, the continuity and stability of equipment operation are improved, and the maintenance cost and production capacity loss are effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0017] Figure 1 The structural schematic diagram of the exhaust valve provided in the embodiments of the present application is shown in the following figure.

[0018] Figure 2 for Figure 1 Enlarged view of section A in the image;

[0019] Figure 3 This is a schematic diagram of the valve core structure provided in the embodiments of this application;

[0020] Figure 4 This is a schematic diagram of the valve seat assembly provided in the embodiments of this application;

[0021] Figure 5 This is a schematic diagram of the structure of the swirl noise reduction plate provided in the embodiments of this application;

[0022] Figure 6 This is a schematic diagram of the structure of the buffer tube assembly provided in the embodiments of this application.

[0023] Icons: 1-Valve body; 11-Media inlet; 12-Media outlet; 2-Valve seat assembly; 21-Second conical structure; 3-Valve cover assembly; 31-Valve cover body; 32-Valve cover flange; 4-Valve core; 41-First conical structure; 42-Inverted conical structure; 5-Valve stem; 51-Inverted sealing boss; 6-Pneumatic device; 7-Buffer tube assembly; 71-Ceramic liner; 711-First ceramic component; 712-Second ceramic component; 8-Sealing assembly; 81-Stuffing gland; 811-First sealing structure; 8 111-First graphite braided packing; 8112-Graphite packing; 8113-Guide sleeve; 812-Second sealing structure; 8121-Second graphite braided packing; 8122-Spacer; 813-Third sealing structure; 8131-Purge sleeve; 8132-Wedge sealing ring; 8133-Fluorinated ethylene propylene copolymer end ring; 82-Elastic loading device; 821-Packing pressure plate; 822-Packing pressure sleeve; 823-Stud; 824-Nut; 825-Disc spring assembly; 9-Swirl noise reduction plate. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0026] This application provides an exhaust valve, such as... Figures 1 to 6 As shown. The exhaust valve includes a valve body 1, a valve seat assembly 2, a valve cover assembly 3, a valve core 4, a valve stem 5, a pneumatic device 6, a buffer tube assembly 7, and a sealing assembly 8. The valve body 1 is provided with a medium inlet 11 and a medium outlet 12. The valve seat assembly 2 is located at the medium outlet 12. The valve cover assembly 3 is detachably connected to the top of the valve body 1, and one end of the valve cover assembly 3 extends into the inner cavity of the valve body 1. The sealing assembly 8 is connected to the top of the valve cover assembly 3, and one end of the sealing assembly 8 extends into the inner cavity of the valve cover assembly 3. One end of the valve stem 5 passes through the sealing assembly 8 and the valve cover assembly 3 in sequence and extends into the inner cavity of the valve body 1, connecting with the valve core 4. The outer wall of the valve core 4 is provided with a first sealing part, and the inner wall of the valve seat assembly 2 is provided with a second sealing part. The first sealing part is a first conical surface structure 41, and the second sealing part is provided with a second conical surface structure 21 that cooperates with the first conical surface structure 41. Specifically, the first conical surface structure 41 and the second conical surface structure 21 constitute a conical hard sealing pair. The valve core 4, the first sealing part, and the second sealing part are all made of ceramic material. The buffer tube assembly 7 is connected to the medium outlet 12 of the valve body 1, and the inner wall of the buffer tube assembly 7 is provided with a ceramic liner 71. The pneumatic device 6 is connected to the end of the valve stem 5 away from the valve core 4, and is used to drive the valve stem 5 to make linear movements, so as to drive the first conical surface structure 41 of the valve core 4 to abut against or move away from the second conical surface structure 21 of the valve seat assembly 2, thereby realizing the closing or opening of the exhaust valve.

[0027] It should be noted that the application drives the valve stem 5 to make linear motion through the pneumatic device 6, drives the first conical surface structure 41 of the valve core 4 to tightly contact or separate from the second conical surface structure 21 of the valve seat assembly 2, so as to realize the opening and closing of the exhaust valve. By upgrading the key components such as the valve core 4, the first sealing part, the second sealing part, the flow-through inner wall of the buffer pipe assembly 7 to ceramic material, a full-flow ceramic protection system is constructed. The design not only fundamentally avoids the direct contact of metal with harsh medium, but also the conical hard sealing pair formed thereby can realize reliable sealing under the working condition containing fine solid particles. Therefore, the application overcomes the technical problems of short service life and frequent leakage of the traditional exhaust valve in harsh environments such as wet smelting, prolongs the maintenance period, improves the continuity and stability of equipment operation, and effectively reduces the maintenance cost and production capacity loss.

[0028] In the embodiment of the application, the end of the valve core 4 away from the valve stem 5 is a reverse conical structure 42. The design makes the flow area between the reverse conical structure 42 of the valve core 4 and the inner wall of the valve seat assembly 2 continuously and smoothly change when the valve core 4 makes linear motion under the drive of the pneumatic device 6, realizing the precise linear regulation function of the medium flow during the opening to closing process of the exhaust valve.

[0029] In the embodiment of the application, the part of the valve stem 5 located in the inner cavity of the valve body 1 is provided with a reverse sealing boss 51. When the valve stem 5 drives the valve core 4 to move to the full open position, the reverse sealing boss 51 abuts against the bottom of the valve cover assembly 3 to form a reverse sealing pair and block the medium flow to the sealing assembly 8.

[0030] In the embodiment of the application, as shown in Figure 5 The exhaust valve further comprises a rotational flow noise reduction plate 9. The rotational flow noise reduction plate 9 is arranged between the buffer pipe assembly 7 and the medium outlet 12, and is made of ceramic material.

[0031] It should be noted that the rotational flow noise reduction plate 9 can effectively comb the high-speed and disordered medium flow after the valve seat assembly 2 into rotating and orderly vortex flow through the unique spiral flow channel structure inside the rotational flow noise reduction plate 9. This process not only reduces the strong noise caused by turbulent flow and rapid expansion of gas, but also improves the working environment and meets the environmental protection requirements.

[0032] In the embodiment of the application, the ceramic lining 71 of the buffer pipe assembly 7 comprises a first ceramic piece 711 and a second ceramic piece 712 arranged in sequence along the medium flow direction. The first ceramic piece 711 is connected with the bottom of the valve seat assembly 2, and the cross-sectional area of the flow-through passage of the second ceramic piece 712 gradually increases along the medium flow direction.

[0033] In the embodiment of the present application, the sealing assembly 8 comprises a packing gland 81 and an elastic loading device 82. The packing gland 81 is arranged in the inner cavity of the bonnet assembly 3 and surrounds the outer wall of the valve stem 5. The elastic loading device 82 is arranged at the top of the packing gland 81 and is used to apply a continuous axial compression force to the packing gland 81.

[0034] In the embodiment of the present application, the elastic loading device 82 comprises a packing plate 821, a packing sleeve 822, a stud 823, a nut 824 and a disc spring set 825. One end of the packing sleeve 822 extends into the bonnet assembly 3 and is pressed against the top of the packing gland 81. The packing plate 821 is arranged at the top of the packing sleeve 822. One end of the stud 823 is fixed to the bonnet assembly 3, and the other end is connected to the nut 824 in sequence after passing through the packing plate 821 and the disc spring set 825. By tightening the nut 824 to compress the disc spring set 825, the elastic restoring force of the disc spring set 825 continuously acts on the packing gland 81 through the packing plate 821 and the packing sleeve 822.

[0035] In the embodiment of the present application, the packing gland 81 comprises a first sealing structure 811, a second sealing structure 812 and a third sealing structure 813 arranged in sequence from bottom to top. The first sealing structure 811 is close to the inner cavity of the valve body 1 and comprises a first graphite woven packing 8111, a graphite packing 8112 and a guide sleeve 8113 connected in sequence from bottom to top, which is used to realize high-temperature sealing and guide the valve stem 5. The second sealing structure 812 comprises a second graphite woven packing 8121 arranged at the top of the guide sleeve 8113 and a spacer sleeve 8122 arranged at the top of the second graphite woven packing 8121, which is used to assist sealing and block heat transfer. The third sealing structure 813 comprises a flushing sleeve 8131, a wedge-shaped sealing ring 8132 and a fluorinated ethylene propylene copolymer end ring 8133 connected in sequence from bottom to top, which is used to realize dynamic sealing and prevent medium corrosion. The flushing sleeve 8131 is connected to the top of the spacer sleeve 8122, and the fluorinated ethylene propylene copolymer end ring 8133 is connected to the bottom of the packing sleeve 822.

[0036] It should be noted that the sealing assembly 8 provided by the embodiment of the present application realizes long-term reliable sealing under 650℃ ultra-high temperature working conditions through the cooperation of the packing gland 81 and the elastic loading device 82. Specifically, the elastic loading device 82 uses the stable and continuous pressure provided by the disc spring set 825 to ensure that the sealing structures of the packing gland 81 are always tightly fitted with the valve stem 5. In the layered design of the packing gland 81, the bottom layer first sealing structure 811 is used for high-temperature sealing and guiding the valve stem 5, the middle layer second sealing structure 812 is used for reinforcing sealing and effectively blocking heat transfer upward, and the top layer third sealing structure 813 takes into account dynamic sealing and medium corrosion resistance. This systematic design solves the problem of easy aging and leakage of traditional packing under high temperature and corrosive medium, and improves the sealing durability and operation safety of the exhaust valve under harsh working conditions.

[0037] Further, the first graphite woven filler 8111 and the second graphite woven filler 8121 are both made of nickel wire reinforced flexible graphite.

[0038] In the embodiment, the bonnet assembly 3 includes a bonnet body 31 and a bonnet flange 32. The bonnet flange 32 is detachably connected between the valve body 1 and the bonnet body 31, and the material of the bonnet flange 32 is stainless steel.

[0039] It should be noted that the bonnet flange 32 of the present application is used as a connecting member and is arranged between the valve body 1 and the bonnet body 31, and is made of stainless steel which has a significantly lower cost than titanium metal. The bonnet body 31 which directly contacts the medium is still made of corrosion-resistant titanium metal. This mixed material design scheme ensures the corrosion resistance of the key parts of the bonnet body 31 while precisely optimizing the material for the non-directly pressure-bearing connecting parts. Compared with the prior art in which the whole valve bonnet assembly 3 is made of expensive titanium metal, the present scheme effectively breaks through the material cost bottleneck, greatly reduces the manufacturing cost, fully meets the use requirements of the exhaust valve under harsh working conditions, and realizes the best balance between cost and performance.

[0040] Specifically, the inner cavity of the valve body 1 is a spherical cavity structure.

[0041] Each embodiment in the specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment mainly describes the difference from other embodiments.

[0042] The above embodiments are only used to illustrate the technical solutions of the present application, and are not limited to the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application.

Claims

1. An exhaust valve characterized by, The valve body (1), the valve seat assembly (2), the valve cover assembly (3), the valve core (4), the valve rod (5), the pneumatic device (6), the buffer pipe assembly (7) and the sealing assembly (8) are included. The valve body (1) is provided with a medium inlet (11) and a medium outlet (12); the valve seat assembly (2) is arranged at the medium outlet (12); The valve cover assembly (3) is detachably connected to the top of the valve body (1), and one end of the valve cover assembly (3) extends into the inner cavity of the valve body (1); The sealing assembly (8) is connected to the top of the valve cover assembly (3), and one end of the sealing assembly (8) extends into the inner cavity of the valve cover assembly (3); One end of the valve rod (5) sequentially passes through the sealing assembly (8) and the valve cover assembly (3) and extends into the inner cavity of the valve body (1) and is connected with the valve core (4); the outer wall of the valve core (4) is provided with a first sealing part, and the inner wall of the valve seat assembly (2) is provided with a second sealing part; The first sealing part is a first conical surface structure (41), and the second sealing part is provided with a second conical surface structure (21) matched with the first conical surface structure (41); The valve core (4), the first sealing part and the second sealing part are all ceramic materials; The buffer pipe assembly (7) is connected to the medium outlet (12) of the valve body (1), and the flow-through inner wall of the buffer pipe assembly (7) is provided with a ceramic lining (71); The pneumatic device (6) is connected to the end of the valve rod (5) away from the valve core (4), for driving the valve rod (5) to move linearly, so as to drive the first conical surface structure (41) of the valve core (4) to abut or be away from the second conical surface structure (21) of the valve seat assembly (2), to realize the closing or opening of the exhaust valve.

2. The exhaust valve according to claim 1, characterized in that, The end of the valve core (4) away from the valve rod (5) is a reverse conical structure (42).

3. The exhaust valve of claim 1, wherein The part of the valve rod (5) located in the inner cavity of the valve body (1) is provided with a reverse sealing boss (51); When the valve rod (5) drives the valve core (4) to move to the full opening position, the reverse sealing boss (51) abuts against the bottom of the valve cover assembly (3) to form a reverse sealing pair, so as to block the medium flowing to the sealing assembly (8).

4. The exhaust valve of claim 1, wherein It also includes a cyclone noise reduction plate (9); The cyclone noise reduction plate (9) is arranged between the buffer pipe assembly (7) and the medium outlet (12) and is made of ceramic material.

5. The exhaust valve of claim 1, wherein The ceramic lining (71) of the buffer pipe assembly (7) includes a first ceramic piece (711) and a second ceramic piece (712) arranged in sequence along the medium flow direction; The first ceramic piece (711) is connected with the bottom of the valve seat assembly (2), and the cross-sectional area of the flow-through passage of the second ceramic piece (712) gradually increases along the medium flow direction.

6. The exhaust valve of claim 1, wherein The sealing assembly (8) includes a packing gland (81) and an elastic loading device (82); The packing gland (81) is arranged in the inner cavity of the valve cover assembly (3) and surrounds the outer wall of the valve rod (5); The elastic loading device (82) is arranged on the top of the stuffing box (81) and used to apply a continuous axial compression force to the stuffing box (81).

7. The exhaust valve of claim 6, wherein, The elastic loading device (82) comprises a stuffing compression plate (821), a stuffing compression sleeve (822), a stud (823), a nut (824) and a disc spring set (825). One end of the stuffing compression sleeve (822) extends into the valve cover assembly (3) and is pressed against the top of the stuffing box (81). The stuffing compression plate (821) is arranged on the top of the stuffing compression sleeve (822). One end of the stud (823) is fixed to the valve cover assembly (3), and the other end is connected with the nut (824) after sequentially penetrating through the stuffing compression plate (821) and the disc spring set (825). The elastic restoring force of the disc spring set (825) continuously acts on the stuffing box (81) through the stuffing compression plate (821) and the stuffing compression sleeve (822) by rotating and tightening the nut (824) to compress the disc spring set (825).

8. The exhaust valve of claim 7, wherein, The stuffing box (81) comprises a first sealing structure (811), a second sealing structure (812) and a third sealing structure (813) arranged in sequence from bottom to top. The first sealing structure (811) is close to the inner cavity of the valve body (1) and comprises a first graphite woven packing (8111), a graphite packing (8112) and a guide sleeve (8113) connected in sequence from bottom to top, used to realize high-temperature sealing and guide the valve rod (5). The second sealing structure (812) comprises a second graphite woven packing (8121) arranged on the top of the guide sleeve (8113) and a spacer sleeve (8122) arranged on the top of the second graphite woven packing (8121), used to assist sealing and block heat transfer. The third sealing structure (813) comprises a flushing sleeve (8131), a wedge-shaped sealing ring (8132) and a fluorinated ethylene propylene end ring (8133) connected in sequence from bottom to top, used to realize dynamic sealing and prevent medium corrosion. The flushing sleeve (8131) is connected to the top of the spacer sleeve (8122), and the fluorinated ethylene propylene end ring (8133) is connected to the bottom of the stuffing compression sleeve (822).

9. The exhaust valve of claim 1, wherein, The valve cover assembly (3) comprises a valve cover body (31) and a valve cover flange (32). The valve cover flange (32) is detachably connected between the valve body (1) and the valve cover body (31), and the material of the valve cover flange (32) is stainless steel.

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