Plug cock structure and plug valve with same

Abstract

The utility model relates to a cock structure and a cock valve with the cock structure, and belongs to the technical field of valves. Comprising a cock body and a flow channel penetrating through the cock body, and the flow channel is a circular through hole with a constant inner diameter; the constant inner diameter of the flow channel is consistent with the preset inner diameter of the pipeline, so that a full-through flow channel is formed when the plug valve is completely opened; a flow slowing convex rib is arranged on the surface of the cock body and surrounds the periphery of each opening of the flow channel, and each flow slowing convex rib is provided with an arc-shaped top face and a side face in smooth transition with the surface of the cock body. High-pressure fluid in the pipeline firstly makes contact with the smooth side faces and the round top faces of the slow flow convex ribs. The fluid which can directly impact the right-angle edge originally is buffered and regulated in advance, and is smoothly guided to enter the flow channel with the minimum energy loss.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a plug structure and a plug valve with the plug structure. Background Art

[0002] A plug valve is primarily composed of a valve body and a plug that rotates within the body. The plug has a through-flow channel that can be quickly fully opened or closed by rotating the plug 90 degrees to align or offset the flow channel with the valve body.

[0003] To reduce pressure loss and improve flow capacity when fluids pass through the valve, a full-bore plug valve is widely used. Its core feature is that the inner diameter of the flow channel on the plug body is identical to the inner diameter of the connected pipe. When the valve is 100% open, the entire flow channel is unobstructed, with minimal flow resistance, almost equivalent to a straight pipe of equal diameter. This makes full-bore plug valves particularly suitable for conveying media containing solid particles, viscous, or easily crystallizing, and also facilitates pipeline pigging operations.

[0004] However, in the plug valve of the prior art, the intersection of the opening of the flow channel on the plug body and its outer peripheral cylindrical surface or conical surface usually naturally forms a sharp right-angle edge of approximately 90 degrees.

[0005] When partially open, this right-angled edge becomes the primary throttling point for the fluid. Its sharp geometry causes rapid contraction and separation of the fluid, generating intense eddies and turbulence, leading to significant pressure loss and energy dissipation. Furthermore, high-speed fluids (especially abrasive media containing solid particles) can directly impact this right-angled edge and the downstream inner wall of the valve, causing severe erosion and wear. Utility Model Content

[0006] In order to solve the above-mentioned problems in the prior art, the utility model provides a plug structure and a plug valve having the plug structure.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A plug structure is provided, which is suitable for being assembled to a plug valve, wherein the plug valve is configured to be connected to a pipe having a predetermined inner diameter. The plug structure includes a plug body and a flow channel passing through the plug body.

[0009] The flow channel is a circular through hole with a constant inner diameter;

[0010] The constant inner diameter of the flow channel is consistent with the predetermined inner diameter of the pipeline to form a full-bore flow channel when the stopcock is fully opened;

[0011] A slow-flow rib is provided on the surface of the plug body and around the periphery of each opening of the flow channel, and the slow-flow rib has an arc-shaped top surface and a side surface that smoothly transitions with the surface of the plug body.

[0012] Preferably, a plurality of pressure relief grooves are provided on the flow-slowing rib, running across the top surface thereof, for connecting the spaces on both sides thereof.

[0013] Preferably, the pressure relief groove is a groove structure with an arc-shaped direction.

[0014] Preferably, at least one guide rib for eliminating fluid rotation is provided at the outlet of the pressure relief groove.

[0015] Preferably, an annular groove for accommodating a sealing member is concentrically provided on the outer side of the flow-slowing rib;

[0016] Wherein, the cross section of each annular groove is configured to be a T-shaped or dovetail-shaped structure for mechanically locking the sealing element.

[0017] Preferably, the inner wall surface of the annular groove is provided with a chimeric structure;

[0018] The embedded structure is a plurality of inclined grooves, and at least a portion of the sealing element is coupled into the embedded structure.

[0019] Preferably, the sealing member has an arc-shaped top surface and a side surface that smoothly transitions with the surface of the plug body;

[0020] Wherein, the protrusion heights of the sealing member and the flow-slowing rib relative to the surface of the plug body are consistent.

[0021] Preferably, the seal forms a wear indicator mark having a predetermined depth;

[0022] The depth of the wear indicator mark corresponds to a preset maximum allowable wear of the seal.

[0023] Preferably, one or more flexible grooves for absorbing thermal expansion of the plug body are provided in the solid portion of the plug body that is not penetrated by the flow channel.

[0024] The utility model also provides a plug valve, comprising at least:

[0025] valve seat;

[0026] The plug structure as described in any one of the above technical solutions is assembled into the valve seat.

[0027] The utility model provides a plug structure and a plug valve having the plug structure. The beneficial effects of the utility model are embodied in:

[0028] When the plug rotates during opening or closing, the high-pressure fluid in the pipe first encounters the smooth sides and rounded top of the slow-flow ribs. This preemptively buffers and aligns the fluid, which would otherwise impact the right-angled edges, and smoothly guides it into the flow channel with minimal energy loss. This process significantly reduces fluid separation and suppresses the generation of violent vortices. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a front view of the cock structure proposed by the utility model;

[0030] Figure 2 for Figure 1 A local enlarged schematic diagram at point A;

[0031] Figure 3 This is a cross-sectional view of the slow-flow rib in the plug structure proposed in the utility model;

[0032] Figure 4 This is a cross-sectional view of the sealing member in the plug structure proposed in the present utility model;

[0033] Figure 5 This is a front view of the plug valve proposed by the utility model.

[0034] Description of reference numerals:

[0035] 1. Plug body; 2. Flow channel; 3. Slow-flow rib; 301. Pressure relief groove; 302. Flow guide rib; 4. Annular groove; 5. Seal; 6. Mosaic structure; 7. Wear indicator mark; 8. Flexible groove; 9. Valve seat. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] See also Figure 1-Figure 5 As shown, the specific embodiments provided by the present invention are as follows:

[0038] like Figures 1 to 4 As shown, an embodiment of the present invention provides a plug structure comprising a plug body 1. The plug body 1 is typically cylindrical or conical in shape, with its outer circumferential surface tightly fitting within the valve body of the plug valve. A flow channel 2 is provided within the plug body 1, extending through its central axis.

[0039] The flow channel 2 is a circular through-hole with a constant inner diameter, designed to seamlessly interface with external piping systems. Specifically, the constant inner diameter of the flow channel 2 is identical to the predetermined inner diameter of the connected pipeline. This allows the valve to form a uniform, unrestricted passageway with the pipeline when the plug valve is fully open. This creates a full-diameter flow channel 2. This minimizes pressure loss as fluid passes through the valve, making it particularly suitable for applications requiring low flow resistance.

[0040] In order to solve the many problems mentioned in the background art caused by the sharp edges at the opening of the flow channel 2, this solution integrally forms a circle of slow-flow ribs 3 on the surface of the plug body 1 and around the periphery of each opening of the flow channel 2.

[0041] Specifically, the slow-flow rib 3 is a continuous annular rib that smoothly protrudes from the surface of the plug body 1. The slow-flow rib 3 has an outwardly protruding, smooth arc-shaped top surface and a side surface that forms a smooth transition with the surface of the plug body 1.

[0042] In the prior art, the sharp right-angled edges at the opening of flow channel 2 are the source of turbulence, scouring, and noise. However, in this embodiment, when the stopcock rotates during opening or closing, the high-pressure fluid in the pipeline first contacts the smooth sides and rounded top surface of the slow-flow rib 3. The fluid, which would otherwise directly impact the right-angled edges, is pre-buffered and regulated, smoothly guiding it into flow channel 2 with minimal energy loss. This process significantly reduces fluid separation and suppresses the generation of violent eddies.

[0043] Even when the valve is fully open, the slow-flow rib 3 is located at the connection seam between the pipe and the flow channel 2, which can effectively eliminate the step effect that may be caused by centering error or connection gap, and plays a role in stabilizing the flow field and reducing pipeline disturbances.

[0044] In a preferred embodiment, a plurality of pressure relief grooves 301 are provided on the flow-slowing rib 3 and extend across the top surface thereof.

[0045] Specifically, these pressure relief grooves 301 are a number of narrow channels spaced at predetermined intervals and transversely intersecting the slow-flow rib 3. Each pressure relief groove 301 originates from the inner side of the slow-flow rib 3 (the side closest to the opening of the flow channel 2), passes through its curved top surface, and extends to the outer side (the side away from the opening of the flow channel 2), thereby achieving fluid communication between the inner and outer spaces of the slow-flow rib 3.

[0046] During the dynamic process of valve opening or closing, some high-pressure fluid may be temporarily trapped in the small annular space outside the slow-flow rib 3. The pressure relief groove 301 provides a pressure release path for this trapped high-pressure fluid, allowing it to instantly achieve equilibrium with the pressure in the flow channel 2.

[0047] On the other hand, when the conveyed medium contains solid particles or impurities, the low-flow area outside the slow-flow rib 3 can easily become a deposit area for impurities. Long-term accumulation of impurities can cause wear. By connecting the inside and outside, the pressure relief groove 301 utilizes the slight pressure difference and turbulence generated by the flow of the main fluid to continuously remove any impurities that may have settled there and carry them into the main fluid for flushing. This ensures the cleanliness of the external area and greatly improves the long-term operational reliability of the plug structure in unclean media.

[0048] In another preferred embodiment, the pressure relief groove 301 is a groove structure with an arc shape. That is, the center line of the pressure relief groove 301 from its inlet to its outlet is not a straight line, but a smooth curve.

[0049] When a linear groove is exposed to high-pressure fluid, the fluid directly impacts its inner wall and outlet edge. However, the curved groove structure in this embodiment is more gentle, dissipating energy through the fluid's own rotation rather than through hard impact. This significantly reduces the impact of the fluid on the pressure relief groove 301 itself.

[0050] In a preferred embodiment, at the outlet of the arc-shaped pressure relief groove 301, at least one, preferably two or more guide ribs 302 for eliminating fluid rotation are integrally provided.

[0051] Specifically, these guide ribs 302 are tiny vertical ribs or blades parallel to the main flow direction of the cock. They effectively divide the original single outlet of the pressure relief groove 301 into several parallel passages.

[0052] The reason is that the fluid flowing through the curved groove structure has a certain amount of rotational kinetic energy. If the fluid directly acts on the opening of the flow channel 2, its continuous rotational shear force may still cause wear on the plug body. This embodiment adds guide ribs 302. When the rotating fluid flows through these parallel guide ribs 302 at the outlet, its rotational momentum is forcibly decomposed, restoring it to a straight linear flow. This eliminates the additional wear that may be caused by rotational shear force and can maximize the service life of the plug body under harsh working conditions.

[0053] In another preferred embodiment of the present invention, an annular groove 4 is provided on the outer side of the flow-slowing rib 3 and concentric therewith, for accommodating a sealing member 5. A predetermined distance is maintained between the annular groove 4 and the flow-slowing rib 3, and the surface of this distance and the sealing member 5 together form the sealing surface of the valve.

[0054] Specifically, the cross section of each annular groove 4 is configured to be a T-shaped or dovetail structure for mechanically locking the seal 5. The common feature of this structure is that the opening width of the annular groove 4 is smaller than its internal width, thereby forming a wide cavity inside the annular groove 4 and a narrow neck opening outside.

[0055] When the valve is subjected to high pressure, the seal 5, made of an elastic or plastic material, will creep and deform, and there is a risk of the high-pressure medium being squeezed out of the opening of the annular groove 4. Once the seal 5 is squeezed out and damaged, the valve will immediately experience serious leakage, causing production interruption or even safety accidents.

[0056] In this embodiment, as previously described, the root portion of the seal 5 is prefabricated to match the T-shaped or dovetail-shaped chamber. Once the seal 5 is installed into the wide chamber through the narrow neck opening, its wider root portion is firmly anchored within the annular groove 4, preventing the root portion of the seal 5 from moving outward under high pressure.

[0057] In another preferred embodiment of the present invention, a fitting structure 6 is provided on the inner wall surface of the annular groove 4 .

[0058] Specifically, the interlocking structure 6 can be a plurality of shallow and narrow grooves arranged obliquely along the inner wall of the groove, and the sealing member 5 matched therewith has ribs pre-formed on its outer surface that are complementary to the oblique grooves.

[0059] When the seal 5 is installed in the annular groove 4, the ribs on its surface couple with the inclined grooves on the inner wall of the groove. During the rotation of the plug valve, friction is generated between the seal 5 and the valve seat 9. This friction may cause the seal 5 to twist slightly in the groove. Over time, this twisting may cause fatigue or permanent deformation of the seal 5 material, thereby affecting the sealing effect. The interlocking structure 6 in this embodiment provides an anti-torsion lock for the seal 5. No matter how the plug valve rotates, it can ensure that the seal 5 itself remains absolutely circumferentially stationary, eliminating the possibility of torsional failure.

[0060] In another more preferred embodiment, the exposed top surface of the seal 5 installed in the annular groove 4 is flush with the top surface of the adjacent slow-flow rib 3. In other words, the protrusion heights of the seal 5 and the slow-flow rib 3 relative to the surface of the tap body 1 are exactly the same.

[0061] In a preferred embodiment, one or more wear indicator marks 7 with a preset depth are formed on the top surface of the sealing member 5 .

[0062] Specifically, the wear indicator mark 7 can be one or more transverse or partially extending grooves, one or more dot-shaped indentations, or any other marking whose geometry undergoes a noticeable, discernible change after wear. The depth of the wear indicator mark 7 corresponds to the preset maximum allowable wear of the seal 5 while ensuring a reliable seal. For example, if the sealing performance of a seal 5 begins to degrade to an unacceptable level after 0.5 mm of wear, the initial depth of the wear indicator mark 7 is set to 0.5 mm.

[0063] During long-term valve operation, the top surface of seal 5 will wear due to frequent friction with valve seat 9. As the wear accumulates, the depth of wear indicator mark 7 gradually decreases. When the wear of seal 5 reaches its designed safety limit (e.g., 0.5 mm), the wear indicator mark 7 will be completely worn away and disappear.

[0064] When maintenance personnel perform routine inspections on the valve, disassemble and observe the plug, they only need to visually check whether the mark exists to quickly determine whether the seal 5 has reached the end of its service life and needs to be replaced immediately, without the need for complex measuring tools such as calipers and depth gauges.

[0065] In another preferred embodiment of the present invention, one or more flexible grooves 8 for absorbing thermal expansion of the tap body 1 are provided in the solid portion of the tap body 1 that is not penetrated by the flow channel 2 .

[0066] The flexible groove 8 is a gap arranged axially along the plug body 1. It can be a through groove extending from the top end surface of the plug body 1 to its bottom end surface, or it can be a blind groove extending from a single end surface toward the center of the plug to a preset depth.

[0067] In high-temperature applications (such as conveying hot steam or hot oil), metal materials expand when heated. Because the plug body 1 is a solid component, its thermal expansion tends to be greater than that of the hollow valve body. When the temperature rises to a certain level, the plug's outer diameter can expand and create an interference fit with the inner wall of the valve body, resulting in a sharp increase in friction and ultimately causing the plug to lock or become stuck, preventing rotation.

[0068] When the plug body 1 is heated, the outward expansion stress generated is directed onto the flexible groove 8, causing the groove's gap to close inward and narrow. In other words, the energy from thermal expansion is converted into compressive deformation of the groove, rather than directly increasing the plug's outer diameter. This ensures the valve's operational reliability and safety over a wide temperature range.

[0069] like Figure 5 As shown, the embodiment of the present utility model further provides a plug valve, comprising at least:

[0070] Valve seat 9;

[0071] The plug structure as described in any one of the above embodiments is assembled into the valve seat 9 .

[0072] The plug valve provided in this embodiment has all the above-mentioned beneficial effects, which will not be described in detail here.

[0073] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A plug structure, adapted to be assembled to a plug valve, wherein the plug valve is configured to be connected to a pipe having a predetermined inner diameter, the plug structure comprising a plug body and a flow channel extending through the plug body, characterized in that: The flow channel is a circular through hole with a constant inner diameter; The constant inner diameter of the flow channel is consistent with the predetermined inner diameter of the pipeline to form a full-bore flow channel when the stopcock is fully opened; A slow-flow rib is provided on the surface of the plug body and around the periphery of each opening of the flow channel, and the slow-flow rib has an arc-shaped top surface and a side surface that smoothly transitions with the surface of the plug body.

2. The plug structure according to claim 1, characterized in that: A plurality of pressure relief grooves are provided on the slow-flow convex rib and run across the top surface thereof so as to connect the spaces on both sides thereof.

3. The plug structure according to claim 2, characterized in that: The pressure relief groove is a groove structure with an arc shape.

4. The plug structure according to claim 3, characterized in that: At least one guide rib is provided at the outlet of the pressure relief groove for eliminating fluid rotation.

5. The plug structure according to claim 1, characterized in that: On the outer side of the flow-slowing rib, a section of an annular groove for accommodating a sealing member is concentrically provided; Wherein, the cross section of each annular groove is configured to be a T-shaped or dovetail-shaped structure for mechanically locking the sealing element.

6. The plug structure according to claim 5, characterized in that: The inner wall surface of the annular groove is provided with a chimeric structure; The embedded structure is a plurality of inclined grooves, and at least a portion of the sealing element is coupled into the embedded structure.

7. The plug structure according to claim 6, characterized in that: The sealing member has an arc-shaped top surface and a side surface that smoothly transitions with the surface of the plug body; Wherein, the protrusion heights of the sealing member and the flow-slowing rib relative to the surface of the plug body are consistent.

8. The plug structure according to claim 7, characterized in that: The seal forms a wear indicator mark having a predetermined depth; The depth of the wear indicator mark corresponds to a preset maximum allowable wear of the seal.

9. The plug structure according to claim 1, characterized in that: One or more flexible grooves for absorbing thermal expansion of the plug body are provided in a solid portion of the plug body that is not penetrated by the flow channel.

10. A plug valve, characterized in that: At least: valve seat; The plug structure according to any one of claims 1 to 9 is assembled into the valve seat.

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