Steam extraction check valve

Abstract

The utility model provides a steam extraction check valve, and belongs to the technical field of check valves, the steam extraction check valve comprises a valve body, the valve body comprises an inlet flow channel, a valve cavity and an outlet flow channel, a valve rod is transversely fixed in the valve cavity, a valve clack is rotatably arranged on the valve rod, a mounting groove is formed in one end, close to the valve cavity, of the inlet flow channel, and a base ring, a valve seat ring and a fixing ring are arranged in the mounting groove; an elastic sealing ring is arranged between the base ring and the valve seat ring, the outer ring of the elastic sealing ring is closed, the inner ring of the elastic sealing ring is provided with an opening gradually expanding towards the center of the mounting groove, the two side walls of the opening abut against the base ring and the valve seat ring respectively, and an elastic piece abuts against the interior of the opening. The elastic sealing ring with the opening is arranged between the base ring and the valve seat ring, impact energy generated when the valve clack is closed can be absorbed, meanwhile, the elastic sealing ring in the special shape can form more reliable sealing with the two side portions under medium impact, and medium fluid channeling is avoided.

Description

Technical Field

[0001] This utility model relates to the field of check valve technology, and in particular to a steam extraction check valve. Background Technology

[0002] Steam extraction check valves are suitable for use in steam or water pipelines. Their core function is to allow flow of the medium under normal conditions and to quickly close when backflow occurs, blocking the backflow path. In actual use, the medium enters the valve chamber through the inlet channel of the valve body, pushing the valve disc on the valve stem to rotate and open, and then exits through the outlet channel. When the medium flows back, the valve disc rotates in the opposite direction under the backflow pressure, fitting against the valve seat to achieve a seal. The sealing reliability, ease of maintenance, and flow efficiency of this type of valve directly affect the operational safety and stability of the unit. In existing technologies, the sealing structure between the valve disc and the valve seat of steam extraction check valves is mostly a rigid contact seal. When the valve disc closes, it is easy to impact the valve seat, and after long-term use, the sealing surface is prone to damage, leading to leakage. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a steam extraction check valve.

[0004] The technical solution adopted by this utility model is as follows: This application provides a steam extraction check valve, including a valve body, the valve body including an inlet flow channel, a valve cavity and an outlet flow channel, a valve stem is horizontally fixed in the valve cavity, a valve disc is rotatably disposed on the valve stem, an installation groove is provided at one end of the inlet flow channel near the valve cavity, a base ring, a valve seat ring and a fixing ring are disposed in the installation groove, the fixing ring and the installation groove are detachably connected to fix the valve seat ring and the base ring in the installation groove in sequence, a first sealing part is provided on the valve seat ring facing the valve disc, a second sealing part is provided on the valve disc corresponding to the first sealing part, an elastic sealing ring is provided between the base ring and the valve seat ring, the outer ring of the elastic sealing ring is closed, and the inner ring is provided with an opening that gradually expands towards the center of the installation groove, the two side walls of the opening abut against the base ring and the valve seat ring respectively, and an elastic element is abutted in the opening.

[0005] In some embodiments, one of the two side walls of the opening and the base ring and valve seat ring are provided with a protrusion, and the other is provided with a groove.

[0006] In some embodiments, a cavity is formed between the base ring and the valve seat ring on the inner side of the elastic sealing ring. An installation ring is provided in the cavity, and sealing lips are provided on both sides of the installation ring to abut against the inner wall of the cavity. The abutting ends of the sealing lips are gradually opened.

[0007] In some embodiments, a first sealing ring is provided between the end of the base ring away from the valve disc and the mounting groove, and a second sealing ring is provided between the outer peripheral wall of the valve seat ring and the inner peripheral wall of the mounting groove.

[0008] In some embodiments, the inlet flow channel forms a narrowing section channel toward the valve cavity, the inner rings of the base ring and the valve seat ring form a constricted section channel, the inner ring of the first sealing part forms an enlarged section channel, and the narrowing section channel, the constricted section channel, and the enlarged section channel form a Venturi channel.

[0009] In some embodiments, the valve disc is provided with an arc-shaped protrusion on the side facing the inlet channel, and the center of the arc-shaped protrusion is on the central axis of the inlet channel.

[0010] In some embodiments, a filter screen is detachably mounted on the inner ring of the mounting ring.

[0011] In some embodiments, an abutment post is provided on the back of the valve disc, and an installation hole is provided in the valve cavity along the moving path of the abutment post. A top block is slidably provided in the installation hole, and a third sealing ring is provided between the outer peripheral wall of the top block and the inner peripheral wall of the installation hole. The end of the top block away from the valve disc is threadedly connected to the valve body and extends out of the valve body and is provided with an adjustment part.

[0012] The beneficial effects of this utility model are as follows: By setting an elastic sealing ring with an opening between the base ring and the valve seat ring, this utility model can absorb the impact energy when the valve disc closes. At the same time, the special-shaped elastic sealing ring can form a more reliable seal with the two sides under the impact of the medium to avoid medium leakage. The pop-up element built into the opening further improves the reset ability of the elastic sealing ring and automatically compensates for the wear of the sealing surface. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0014] Figure 1 This is a cross-sectional view of a steam extraction check valve according to the present invention.

[0015] Figure 2 This is a partial cross-sectional view of a steam extraction check valve according to the present invention. Figure 1 ;

[0016] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0017] Figure 4 This is a partial cross-sectional view of a steam extraction check valve according to the present invention. Figure 2 ;

[0018] Figure 5 This is a schematic diagram of a steam extraction check valve according to the present invention. Detailed Implementation

[0019] The following description provides specific application scenarios and requirements for this specification, intended to enable those skilled in the art to make and use the contents of this specification. Various partial modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but rather to the widest scope consistent with the claims.

[0020] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "lateral", "radial", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element or component to have a specific orientation, or to be constructed and operated in a specific orientation.

[0021] It should be noted that the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different components and should not be construed as limiting the embodiments of this application.

[0022] It should be noted that the terms "installation," "setup," "equipped with," "connection," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral structures; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two devices, components, or parts.

[0023] It should be noted that the terms "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "in some embodiments," "exemplarily," and "for example" is intended to present the relevant concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of this application.

[0024] Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] Regarding the accompanying drawings of this application, it should be clearly understood that the drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of this specification. It should also be understood that the drawings are not necessarily drawn to scale.

[0026] The existing steam extraction check valve uses a rigid contact seal between valve disc 3 and valve seat. When valve disc 3 is closed, the impact load acts directly on the sealing surface, which can easily cause damage to the sealing surface.

[0027] Based on the above problems, this utility model proposes a steam extraction check valve, such as... Figures 1 to 5 As shown:

[0028] The valve body 1 of the steam extraction check valve is integrally formed from WCB cast steel, which has excellent structural strength and high temperature and high pressure resistance. The valve body 1 is provided with an inlet flow channel 100, a valve cavity 101 and an outlet flow channel 102 in sequence along the medium flow direction. The three are coaxially connected to ensure that there is no obvious flow field disturbance when the medium flows, and to avoid the impact of valve disc 3 closing due to flow field turbulence.

[0029] The valve stem 2 is laterally fixed within the valve cavity 101 via support seats at both ends, with its axis perpendicular to the central axis of the inlet flow channel 100. The valve disc 3 has a disc-shaped structure and is rotatably mounted on the valve stem 2 via a self-lubricating bearing, allowing it to rotate flexibly around the valve stem 2 to achieve rapid opening and closing of the valve. This eliminates the need for the valve stem 2 to rotate, reducing the opening resistance of the valve disc 3.

[0030] An annular mounting groove 104 is machined on the inner wall of the inlet flow channel 100 near the valve cavity 101. A base ring 4, a valve seat ring 5, and a fixing ring 6 are arranged in the mounting groove 104, and the three are coaxially assembled from the medium inflow end to the valve cavity 101 end. A first sealing part 50 is provided on the end face of the valve seat ring 5 facing the valve disc 3, and a second sealing part 30 is provided on the valve disc 3 at the position corresponding to the first sealing part 50. When the second sealing part 30 is in contact with the first sealing part 50, a seal can be formed. The fixing ring 6 is detachably connected to the mounting groove 104 by a fine thread. After tightening the fixing ring 6, the valve seat ring 5 and the base ring 4 can be axially pressed and fixed, and the valve seat assembly can be disassembled and installed without disassembling the valve body 1, which greatly improves the convenience of maintenance.

[0031] Importantly, an annular installation gap is reserved between the base ring 4 and the valve seat ring 5. An elastic sealing ring 7 is provided in the installation gap. The outer ring of the elastic sealing ring 7 is a closed arc structure and fits tightly against the inner wall of the mounting groove 104. Its inner ring is provided with an opening 70 that gradually expands towards the center of the mounting groove 104. The two side walls of the opening 70 abut against the base ring 4 and the valve seat ring 5 respectively, which can block the medium from flowing through. It can be understood that the cross-section of the elastic sealing ring 7 is V-shaped or U-shaped.

[0032] This special shape gives the elastic sealing ring 7 a bidirectional deformation capability: when the valve disc 3 is closed, the impact force of the valve disc 3 on the valve seat ring 5 pushes the valve seat ring 5 towards the base ring 4, compressing the opening 70 of the elastic sealing ring 7 to contract. The two side walls of the opening 70 approach each other, and the impact energy is absorbed by the deformation of the rubber material, avoiding damage to the first sealing part 50 and the second sealing part 30 due to rigid collision. At the same time, during the normal flow of the medium, the medium pressure will act on the inner wall of the opening 70, pushing the outer ring of the sealing ring to fit more tightly against the inner wall of the mounting groove 104. The two side walls of the opening 70 press the end faces of the base ring 4 and the valve seat ring 5 respectively, forming a triple seal, completely preventing the medium from flowing through the gap between the base ring 4 and the valve seat ring 5.

[0033] An elastic element 71 is provided inside the opening 70. Preferably, the elastic element 71 is a circular ring with a circular cross-section. Its two ends are in close contact with the two side walls of the opening 70, providing continuous elastic support for the elastic sealing ring 7. If the medium seeps into the opening 70, it can press the two side walls of the opening 70 to achieve a reliable seal.

[0034] Furthermore, one of the two side walls of the opening 70 and the base ring 4 and valve seat ring 5 is provided with a protrusion 700, and the other is provided with a groove 701. For example, the two side walls of the opening 70 are provided with protrusions 700, and the base ring 4 and valve seat ring 5 are provided with corresponding grooves 701. The protrusions 700 and grooves 701 are generally also annular, and the two together not only play a positioning role, but also a sealing role.

[0035] In some embodiments, an annular cavity 8 is formed between the base ring 4 and the valve seat ring 5 inside the elastic sealing ring 7. An installation ring 9 is provided in the cavity 8, and sealing lips 10 are provided on both end faces of the installation ring 9. The abutting ends of the sealing lips 10 are gradually opened. After assembly, the free ends of the sealing lips 10 are in close contact with the inner wall of the cavity 8, that is, the opposite end faces of the base ring 4 and the valve seat ring 5, forming a secondary sealing barrier, which can prevent tiny impurities in the medium from entering the installation area of ​​the elastic sealing ring 7, and avoid impurities from affecting the deformation and sealing effect of the elastic sealing ring 7.

[0036] To further enhance the effect of preventing media from flowing through, a first sealing ring 11 is provided between the end of the base ring 4 away from the valve disc 3 and the bottom of the mounting groove 104, which can block the media from flowing through the gap between the base ring 4 and the bottom of the mounting groove 104; a second sealing ring 12 is provided between the outer peripheral wall of the valve seat ring 5 and the inner peripheral wall of the mounting groove 104, which can block the media from flowing through the gap between the valve seat ring 5 and the inner wall of the mounting groove 104.

[0037] In some embodiments, the inner ring of the mounting ring 9 is detachably fitted with a filter screen 13, for example, by threaded connection, bolt connection or snap-fit ​​connection, to prevent impurities from adhering to the surfaces of the first sealing part 50 and the second sealing part 30, and to avoid impurities from aggravating the wear of the sealing surfaces.

[0038] In some embodiments, to optimize media flow efficiency, the inlet channel 100 is machined with a tapered narrowing section channel 14 in the direction of the valve cavity 101, which can guide the medium to flow faster; the inner rings of the base ring 4 and the valve seat ring 5 are coaxially machined with a cylindrical constricted section channel 15, the diameter of which is consistent with the minimum diameter of the inlet channel 100, for stabilizing the medium flow rate; the inner ring of the first sealing part 50 is machined with a tapered enlarged section channel 16, which can reduce the resistance when the medium flows out; the narrowing section channel 14, the constricted section channel 15 and the enlarged section channel 16 are coaxially connected to form a Venturi channel, which can improve the media flow efficiency.

[0039] To further optimize the flow field distribution and avoid increased impact when valve disc 3 closes due to uneven medium loading, an arc-shaped protrusion 300 is provided on the side of valve disc 3 facing the inlet channel 100. The radius of curvature of the arc-shaped protrusion 300 is adapted to the radius of curvature of the Venturi channel expansion section, and its center coincides with the central axis of the inlet channel 100. When the medium flows through the arc-shaped protrusion 300, the arc-shaped surface can guide the medium to flow smoothly into the valve cavity 101, reduce the generation of eddies, make the force on valve disc 3 more uniform when it opens, avoid uneven contact between the second sealing part 30 and the first sealing part 50 due to uneven force loading, and facilitate the opening of valve disc 3.

[0040] In some embodiments, a cylindrical abutment post 301 is vertically welded to the edge of the back of the valve disc 3. The abutment post 301 is used to limit the maximum opening angle of the valve disc 3. A circular mounting hole 105 is machined on the inner wall of the valve cavity 101 along the moving path of the abutment post 301. A top block 17 is slidably disposed in the mounting hole 105. An annular sealing groove is machined on the outer peripheral wall of the top block 17. A third sealing ring 18 is embedded in the groove. The third sealing ring 18 can prevent the medium from leaking between the inner wall of the mounting hole 105 and the outer peripheral wall of the top block 17. The end of the top block 17 away from the valve disc 3 is connected to the valve body 1 by a thread, and the end extending out of the valve body 1 is integrally formed with a hexagonal adjusting part 19. The extension length of the top block 17 in the mounting hole 105 can be adjusted by rotating the adjusting part, thereby limiting the maximum opening angle of the valve disc 3.

[0041] In summary, after reading this detailed disclosure, those skilled in the art will understand that the foregoing detailed disclosure is presented by way of example only and is not restrictive. Although not explicitly stated herein, those skilled in the art will understand that the requirements of this application encompass various reasonable changes, improvements, and modifications to the embodiments. These changes, improvements, and modifications are intended to be made by this application and are within the spirit and scope of the exemplary embodiments of this application.

[0042] Furthermore, it should be understood that in the foregoing description of the embodiments of this application, various features are combined in a single embodiment, drawing, or description for the purpose of simplifying the understanding of a feature. However, this does not mean that the combination of these features is necessary, and those skilled in the art may readily identify some of the devices as separate embodiments when reading this application. That is, the embodiments in this application can also be understood as an integration of multiple sub-embodiments. It is also valid when each sub-embodiment contains fewer than all the features of a single foregoing disclosed embodiment.

[0043] Finally, it should be understood that the embodiments disclosed herein are illustrative of the principles of the embodiments of this application. Other modified embodiments are also within the scope of this application. Therefore, the embodiments disclosed herein are merely examples and not limitations. Those skilled in the art can adopt alternative configurations to implement the applications in this application based on the embodiments in this application. Therefore, the embodiments of this application are not limited to the embodiments precisely described in the application.

Claims

1. A steam extraction check valve, characterized in that, The device includes a valve body comprising an inlet flow channel, a valve cavity, and an outlet flow channel. A valve stem is laterally fixed within the valve cavity, and a valve disc is rotatably mounted on the valve stem. An installation groove is provided at one end of the inlet flow channel near the valve cavity. A base ring, a valve seat ring, and a fixing ring are provided within the installation groove. The fixing ring and the installation groove are detachably connected, sequentially fixing the valve seat ring and the base ring within the installation groove. A first sealing portion is provided on the valve seat ring facing the valve disc, and a second sealing portion is provided on the valve disc corresponding to the first sealing portion. An elastic sealing ring is provided between the base ring and the valve seat ring. The outer ring of the elastic sealing ring is closed, and the inner ring has an opening that gradually widens towards the center of the installation groove. The two side walls of the opening abut against the base ring and the valve seat ring, respectively, and an elastic element is abutted within the opening.

2. The steam extraction check valve according to claim 1, characterized in that, The two side walls of the opening and the space between the base ring and the valve seat ring are provided with a protrusion on one side and a groove on the other.

3. The steam extraction check valve according to claim 1, characterized in that, A cavity is formed between the base ring and the valve seat ring on the inner side of the elastic sealing ring. An installation ring is provided in the cavity. Sealing lips are provided on both sides of the installation ring and abut against the inner wall of the cavity. The abutting ends of the sealing lips are gradually opened.

4. The steam extraction check valve according to claim 1, characterized in that, A first sealing ring is provided between the end of the base ring away from the valve disc and the mounting groove, and a second sealing ring is provided between the outer peripheral wall of the valve seat ring and the inner peripheral wall of the mounting groove.

5. A steam extraction check valve according to claim 1, characterized in that, The inlet flow channel forms a narrowing section channel towards the valve cavity, the inner rings of the base ring and valve seat ring form a constricted section channel, and the inner ring of the first sealing part forms an enlarged section channel. The narrowing section channel, the constricted section channel, and the enlarged section channel form a Venturi channel.

6. A steam extraction check valve according to claim 1, characterized in that, The valve disc has an arc-shaped protrusion on the side facing the inlet channel, and the center of the arc-shaped protrusion is on the central axis of the inlet channel.

7. A steam extraction check valve according to claim 3, characterized in that, The inner ring of the mounting ring is detachably fitted with a filter screen.

8. A steam extraction check valve according to claim 1, characterized in that, A contact post is provided on the back of the valve disc, and an installation hole is provided in the valve cavity along the moving path of the contact post. A top block is slidably provided in the installation hole, and a third sealing ring is provided between the outer peripheral wall of the top block and the inner peripheral wall of the installation hole. The end of the top block away from the valve disc is threadedly connected to the valve body and extends out of the valve body and is provided with an adjustment part.

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