A double-seal structure valve sleeve sewage valve

Abstract

This application relates to a double-seal valve sleeve drain valve, which belongs to the field of valve technology and includes a valve body, a valve cover, a valve sleeve, a valve core, a valve stem, a spacer, and a pre-sealing assembly. The valve body comprises an input chamber, a valve chamber, and an output chamber, which are sequentially connected. The valve sleeve is disposed within the valve chamber and has multiple openings circumferentially formed therein. The valve core is axially slidable within the valve sleeve. A nut is mounted on the valve cover, and a valve stem is threaded through the nut and connected to the valve core. Rotation of the valve stem drives the valve core up and down, achieving on-off control. A spacer is disposed within the valve body to separate the input chamber from the valve chamber and has a through-hole. The upper end opening of the through-hole is blocked by the valve core during downward movement. The pre-sealing assembly is disposed within the spacer and is structurally capable of partially moving out during valve core sealing, isolating the through-hole from within. As the valve core moves upward, the pre-sealing assembly simultaneously retracts into the spacer. This application utilizes a double-seal structure to distribute fluid impact and extend the service life of the valve body.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a valve sleeve sewage valve with a double sealing structure. Background Art

[0002] At present, valves are mainly used in oil and gas well stations, long-distance oil and gas pipelines, oil depots, gas storage facilities, and liquefied natural gas receiving stations. Currently, most pressure vessels in online operation are equipped with blowdown valves to facilitate blowdown operations on pressure equipment.

[0003] The working principle of the sewage valve is: the valve is opened or closed by moving the valve core up and down. When performing sewage discharge operations, the handwheel is turned to drive the valve core to move up a certain distance from the upper end face of the valve port through the valve stem. The impurities deposited in the pressure equipment can be discharged out of the valve together under the push of the medium. After the impurities are removed, the handwheel is turned in the opposite direction to drive the valve core to move down and close the valve port to close the sewage valve.

[0004] Due to the harsh working environment of the sewage valve, during sewage discharge operations, the seals inside the valve will be damaged by the erosion and cavitation of high-speed fluid media, causing the seals to be damaged and fail, making the valve prone to leakage. Summary of the Invention

[0005] The embodiment of the present application provides a valve sleeve sewage valve with a double sealing structure, which can make the valve less likely to leak, thereby at least partially solving the above-mentioned technical problems.

[0006] In order to achieve the above-mentioned object, the present application provides a double-seal structure valve sleeve drain valve, comprising a valve body, a valve cover, a valve sleeve, a valve core and a valve stem, wherein the valve body is provided with an input chamber, a valve chamber and an output chamber which are connected in sequence, the valve cover is fixedly arranged on the valve body, the valve sleeve is circumferentially provided with a plurality of openings which are connected with the valve chamber and the output chamber, the valve core is axially slidably arranged in the valve sleeve, a nut is fixedly arranged on the valve cover, the valve stem is threadedly inserted into the nut, and one end of the valve stem passes through the valve cover and is connected to the valve core;

[0007] The valve body further includes an isolator and a pre-sealing assembly. The isolator is disposed in the valve body and is used to separate the valve cavity and the input cavity. The isolator is provided with a through hole connecting the valve cavity and the input cavity. The valve core is configured to block the upper end opening of the through hole.

[0008] The pre-sealing component is arranged in the isolation member, and the pre-sealing component is configured to move out of the isolation member and isolate the through hole from the inside of the through hole when the valve stem pushes the valve core to move from top to bottom and blocks the upper end opening of the through hole, and to move back into the isolation member from the inside of the through hole to open the through hole when the valve stem pulls the valve core from bottom to top away from the upper end opening of the through hole.

[0009] Optionally, the isolation member includes a first oblique blocking portion, a transverse blocking portion and a second oblique blocking portion; wherein,

[0010] The highest inclined end of the first oblique blocking portion is connected to the inner top wall of the valve body, and the lowest inclined end is connected to the first end of the transverse blocking portion;

[0011] The lowest inclined end of the second oblique blocking portion is connected to the inner bottom wall of the valve body, and the highest inclined end is connected to the second end of the transverse blocking portion;

[0012] The cross block is located directly below the valve sleeve and is axially sealed with the valve sleeve. The through hole is formed on the cross block and is axially opposite to the inner cavity of the valve sleeve.

[0013] Optionally, a connecting assembly is further included, which is arranged between the valve stem and the pre-sealing assembly, and is used to convert the axial movement of the valve stem in the valve sleeve into movement of the pre-sealing assembly between the isolation piece and the through hole.

[0014] Optionally, an oblique channel is opened in the first oblique blocking portion along its own extension direction, and the oblique channel passes through the outer wall of the valve body and communicates with the outside world. A transverse channel is opened in the transverse blocking portion along its own extension direction, and the first end of the transverse channel is connected to the oblique channel, and the second end of the transverse channel is connected to the through hole. The pre-sealing assembly can be slidably arranged in the oblique channel and the transverse channel.

[0015] Optionally, the pre-sealing component includes a bending part and a peripheral sealing part, the peripheral sealing part is covered on the outside of the bending part, and the connecting component is connected to the peripheral sealing part.

[0016] Optionally, the bending member is composed of a plurality of circular cylinders arranged in parallel, and two adjacent circular cylinders are relatively rolling-fitted, and the peripheral sealing member is a rubber sealing layer, and the rubber sealing layer is coated on the outside of the plurality of circular cylinders;

[0017] The oblique channel has the same length and width as the transverse channel and is compatible with the pre-sealing assembly; wherein,

[0018] When the pre-sealing assembly is in the oblique channel or the transverse channel, the rubber sealing layer is always in an extruded state to seal the gap between the rubber sealing layer and the inner wall of the oblique channel or the transverse channel.

[0019] Optionally, the width of the oblique channel or the transverse channel is greater than the inner diameter of the through hole, and horizontal side grooves connected to the transverse channel are provided on the two inner side walls of the through hole. A sewage channel connected to both the horizontal side groove and the through hole is provided in the transverse block and the second oblique block, and the sewage channel is bent downward, and the end of the sewage channel away from the through hole is open and connected to the input chamber.

[0020] Optionally, the sewage discharge channel has a clamping port, which is the channel port of the sewage discharge channel close to the through hole side. The clamping port is configured to gradually reduce the inner diameter from the side close to the through hole side to the side away from the through hole side, so that part of the pre-sealing component enters the clamping port through the horizontal side groove and is squeezed and stopped by the inner wall of the clamping port.

[0021] Optionally, the inner walls of the oblique channel, the transverse channel, the horizontal side groove and the clamping opening are all covered with a polytetrafluoroethylene layer.

[0022] Optionally, the connecting assembly includes a driving member and a guiding member; wherein,

[0023] The driving member includes a rotating ring, a transverse connecting rod, a vertical connecting rod and a bonding rod. An annular groove is provided on the rod wall of the valve stem away from the valve sleeve. The rotating ring is rotatably sleeved in the annular groove. The transverse connecting rod is horizontally connected to the rotating ring. The vertical connecting rod is vertically connected to one end of the transverse connecting rod away from the rotating ring. The bonding rod is vertically connected to one end of the vertical connecting rod away from the transverse connecting rod, and the bonding rod is bonded to the pre-sealing assembly.

[0024] The guide member includes a guide body, which is vertically arranged on the outer top wall of the valve body. A guide groove is vertically opened in the guide body, and the guide groove is connected to the oblique channel. The vertical connecting rod is vertically inserted into the guide groove, and the bonding rod is slidably arranged in the guide groove. The part of the pre-sealing component away from the transverse channel is also located in the guide groove.

[0025] The present invention has at least the following beneficial effects:

[0026] By introducing a pre-sealing component on the basis of a conventional valve core sealing structure and arranging it inside the isolation part, the pre-sealing component first enters the through hole to form an internal seal before the valve core closes, and can be withdrawn to the inside of the isolation part with the valve core during the opening action, thereby forming a dual-stage, dual-path sealing control mechanism with a certain degree of sealing redundancy and sealing continuity. It can effectively buffer the concentrated effect of the medium impact on a single sealing surface during the opening and closing process of the valve, which is beneficial to delaying the fatigue damage process of the sealing structure and improving the overall sealing reliability. In terms of structural design, this application clarifies the active path and sealing position of the pre-sealing component, so that the through hole can be partially or completely blocked by the pre-sealing component before the valve core is fully sealed. It has a progressive sealing control characteristic and can adapt to the multiple load environments of high-pressure and high-impact fluid media on the sealing structure under sewage discharge conditions. In addition, this solution uses the isolation piece as a structural transition component to divide the input chamber and the valve chamber into two relatively independent areas, which is beneficial to improving the management efficiency of the overall fluid path of the valve body, assisting in achieving precise guidance and synchronous collaboration of the valve core and pre-sealing components, and thereby improving the comprehensive performance of the sewage valve in terms of opening and closing control, sealing safety and structural durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0028] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0029] Figure 1 is a cross-sectional view of a sleeve drain valve provided in an exemplary embodiment of the present disclosure;

[0030] Figure 2 is a partial cross-sectional view showing the positional relationship between the spacer and the pre-sealing assembly in an exemplary embodiment of the present disclosure;

[0031] Figure 3 yes Figure 2 Enlarged schematic diagram of part A.

[0032] Description of reference numerals:

[0033] 1. Valve body; 11. Input chamber; 12. Valve chamber; 13. Output chamber; 2. Valve cover; 21. Nut; 3. Valve sleeve; 31. Opening; 4. Valve core; 5. Valve stem; 6. Isolator; 61. First oblique stop; 611. Oblique channel; 62. Horizontal stop; 621. Through hole; 622. Horizontal channel; 623. Horizontal side groove; 63. Second oblique stop; 631. Drain channel; 6311. Clamping port; 7. Pre-sealing assembly; 71. Bending piece; 711. Circular cylinder; 72. Peripheral sealing piece; 721. Rubber sealing layer; 8. Connecting assembly; 81. Driving piece; 811. Rotating ring; 812. Horizontal connecting rod; 813. Vertical connecting rod; 814. Adhesive rod; 82. Guide piece; 821. Guide body; 822. Guide groove. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0035] The present application provides a double-seal structure valve sleeve 3 drain valve, combined with Figure 1 、 Figure 2 The valve body 1 comprises a valve body 1, a valve cover 2, a valve sleeve 3, a valve core 4, and a valve stem 5. The valve body 1 is internally provided with an input chamber 11, a valve chamber 12, and an output chamber 13, which are sequentially connected. The valve cover 2 is fixedly mounted on the upper portion of the valve body 1, providing a sealing and connection function to prevent leakage of the internal fluid. The valve sleeve 3 is disposed within the valve chamber 12 and is provided with a plurality of openings 31 circumferentially extending from the valve sleeve 3 to the valve chamber 12 and the output chamber 13, thereby conducting fluid when the valve is open. The valve core 4 is axially slidable within the valve sleeve 3 and is used to control the on / off state of the valve during opening and closing. A nut 21 is also fixedly mounted on the valve cover 2. The valve stem 5 is threadedly inserted into the nut 21. One end of the valve stem 5 passes through the valve cover 2 and is connected to the valve core 4. Rotating the valve stem 5 drives the valve core 4 axially, causing the valve core 4 to slide up and down relative to the valve sleeve 3, thereby controlling the on / off state of the fluid.

[0036] Furthermore, based on the above structure, the drain valve with valve sleeve 3 also includes an isolator 6 and a pre-sealing assembly 7. The isolator 6 is installed within the valve body 1, located between the input chamber 11 and the valve chamber 12, and serves to structurally separate the input chamber 11 from the valve chamber 12. The isolator 6 is provided with a through-hole 621, which structurally enables communication between the input chamber 11 and the valve chamber 12. The valve core 4 is configured to seal the upper end of the through-hole 621 during downward movement, thereby closing the valve and blocking the fluid passage. The pre-sealing assembly 7 is installed within the isolator 6 and has axially movable structural characteristics. The pre-sealing assembly 7 is designed to gradually move from the interior of the isolator 6 to the interior space of the through-hole 621 as the valve core 4 is driven downward by the valve stem 5, thereby sealing the through-hole 621 from within. When the pre-sealing assembly 7 has completed its full movement, the through-hole 621 is completely isolated in the vertical direction.

[0037] It can be understood that during the valve closing process, since the pre-sealing component 7 has the design feature of gradually entering the through hole 621 before the valve core 4, the pre-sealing component 7 can first bear part of the impact of the fluid medium in the initial stage of the blocking action, thereby sharing the impact of the medium on the upper end face of the valve core 4 to a certain extent. When the pre-sealing component 7 only partially enters the through hole 621, it has not yet completely blocked the entire through hole 621. There is still a part of the fluid that enters the valve cavity 12 through the unblocked gap and acts on the surface of the valve core 4. Therefore, the valve core 4 and the pre-sealing component 7 bear the impact of the medium respectively at different stages of the valve closing process, and have the effect of buffering and sharing the impact. This structural arrangement helps to extend the service life of the pre-sealing component 7 and the valve core 4 to a certain extent, reduce the concentrated stress borne by a single component, and improve the durability of the sewage valve in frequent operation scenarios.

[0038] Furthermore, the travel of the pre-sealing assembly 7 and the speed at which it enters the through-hole 621 can be rationally designed and adjusted based on the type of fluid medium, flow rate, and valve structural parameters, thereby achieving excellent progressive sealing characteristics. The dimensions of the through-hole 621 and the clearance between the pre-sealing assembly 7 and the through-hole 621 must be set within a reasonable range that achieves effective sealing without affecting the assembly's return to its original position. This structural design clearly defines the interaction between the pre-sealing assembly 7 and the valve core 4 during the closing process, avoiding sealing failures caused by asynchronous assembly movement.

[0039] At the same time, when the valve is opened, the valve stem 5 drives the valve core 4 to move upward, and the valve core 4 gradually moves away from the upper end opening of the through hole 621. The pre-sealing component 7 can also be driven by the valve core 4 to retract synchronously or with delay to the inside of the isolation member 6, so that the through hole 621 is reopened, and the fluid can enter the valve chamber 12 from the input chamber 11 and then flow to the output chamber 13. The entire process maintains the controllability of the operation and the continuity of the sealing action in terms of structural design, and has a certain degree of structural stability and fluid control accuracy. Through the coordinated cooperation of the pre-sealing component 7 and the valve core 4 in the double sealing structure, the impact load can be effectively dispersed when the fluid passes through at high speed, so that the fatigue damage of a single sealing part is reduced, thereby having a beneficial effect on the sealing reliability and service life of the entire sewage valve structure.

[0040] In some embodiments, combined Figure 1 、 Figure 2 The isolation member 6 includes a first oblique stop 61, a transverse stop 62, and a second oblique stop 63, which together form an integral support and partition structure for achieving physical isolation between the input chamber 11 and the valve chamber 12, and providing a bearing surface for the setting of the through hole 621. The first oblique stop 61 is an inclined structure, with its inclination extending downward from the inner top wall of the valve body 1, its highest inclination end connected to the inner top wall of the valve body 1, and its lowest inclination end connected to the first end of the transverse stop 62, so that the first oblique stop 61 structurally plays a supporting role in connecting the upper valve body 1 and the transverse stop 62. The second oblique stop 63 is also an inclined structure, with its inclination extending from bottom to top, its lowest inclination end connected to the inner bottom wall of the valve body 1, and its highest inclination end connected to the second end of the transverse stop 62, thereby structurally completing the support of the isolation member 6 for the lower valve body 1 and the transverse stop 62. Through the structural arrangement of the first oblique blocking portion 61 and the second oblique blocking portion 63 , the transverse blocking portion 62 forms a mounting surface in an inclined supporting state inside the valve body 1 , which has a certain degree of mechanical stability and flow diversion auxiliary function.

[0041] Furthermore, the cross block 62 is provided directly below the valve sleeve 3 and forms a sealed connection with the valve sleeve 3 in the axial direction. This sealing structure can structurally reduce the risk of leakage of the fluid medium into the non-working area. The through hole 621 is provided on the cross block 62. The through hole 621 is arranged axially opposite to the inner cavity of the valve sleeve 3, thereby realizing a passage arrangement for the fluid to enter the valve cavity 12 from the input cavity 11 through the through hole 621. By providing the through hole 621 on the cross block 62 and positioning it opposite to the sliding position of the valve core 4 in the valve sleeve 3, the valve core 4 can effectively cooperate with the pre-sealing component 7 to seal the through hole 621. The alignment relationship between the structures is clear and the functions are closely coordinated, which is beneficial to the realization of the sealing function and the synchronous execution of the control action.

[0042] In this structure, the terms "inclined highest end" and "inclined lowest end" are used to describe the structural characteristics of the first oblique stop 61 and the second oblique stop 63 relative to the horizontal plane. This is to clearly illustrate their inclination direction and connection relationship, and has a clear spatial structural meaning to avoid ambiguity caused by different understandings. Through the above-mentioned structural arrangement, a stable mounting support system is formed on the isolation member 6, and an area is reserved for the installation of the through hole 621, providing a precise positioning basis for the sealing function of the valve core 4 and the pre-sealing assembly 7, thereby improving the reliability of the sealing structure and the stable operation capability of the valve under high-pressure and high-speed conditions to a certain extent.

[0043] In some embodiments, combined Figure 1 、 Figure 2 The connecting assembly 8 is arranged between the valve stem 5 and the pre-sealing assembly 7. Its function is to convert the axial movement of the valve stem 5 in the valve sleeve 3 into a corresponding movement of the pre-sealing assembly 7 between the isolation member 6 and the through-hole 621, so that the pre-sealing assembly 7 can complete position switching synchronously with the movement of the valve stem 5 or according to a set rhythm. The valve stem 5 is rigidly connected to the valve core 4, and the valve core 4 moves axially in the valve sleeve 3 to open and close the valve. When the valve stem 5 rotates downward and drives the valve core 4 downward, the connecting assembly 8 converts the axial downward movement of the valve stem 5 into the process of the pre-sealing assembly 7 entering the through-hole 621, so that the pre-sealing assembly 7 gradually enters the internal channel of the through-hole 621 from the inside of the isolation member 6, and then forms a sealed blockage in the through-hole 621. When the valve stem 5 is rotated in the opposite direction to move the valve core 4 upward, the connecting assembly 8 can drive the pre-sealing assembly 7 back to the inside of the isolation member 6, so that the through-hole 621 is reopened and the fluid passage is restored.

[0044] It should be noted that in the description, "connecting assembly 8" refers to a structural unit that can connect the valve stem 5 and the pre-sealing assembly 7 and transmit the movement of the valve stem 5 to drive the movement of the pre-sealing assembly 7. This term must be strictly distinguished from the sealing assembly, valve core 4 or support structure to avoid misunderstanding. "Converted into the movement of the pre-sealing assembly 7 between the isolation member 6 and the through hole 621" means that the connecting assembly 8, through the mechanism, enables the pre-sealing assembly 7 to extend from the inside of the isolation member 6 into or out of the through hole 621 during the movement of the valve core 4, thereby forming a switch between fluid sealing and passage opening. The overall structure forms a beneficial action linkage relationship between the pre-sealing assembly 7 and the valve stem 5 through the provision of the connecting assembly 8, which has a certain positive impact on improving the stability of the sealing performance and the coordination of the impact sharing function.

[0045] In some embodiments, reference Figure 1 、 Figure 2In order to further improve the sealing reliability of the sewage valve and the flexible movement ability of the pre-sealing component 7 in a complex channel, in this embodiment, an oblique channel 611 is provided inside the first oblique blocking portion 61 along its extension direction. The oblique channel 611 passes through the outer wall of the valve body 1 and is connected to the outside world, and is used to form the entrance and exit of the pre-sealing component 7; a transverse channel 622 is provided inside the transverse blocking portion 62 along its own extension direction. The first end of the transverse channel 622 is connected to the oblique channel 611, and the second end is connected to the through hole 621. The pre-sealing component 7 is slidably arranged inside the oblique channel 611 and the transverse channel 622, and can complete the sliding process from the inside of the isolation member 6 to the through hole 621 under the drive of the connecting component 8. The design of the oblique channel 611 and the transverse channel 622 enables the pre-sealing component 7 to have the ability to be introduced from the outside and move in channels in different directions, providing a channel foundation for the structural adaptability of the pre-sealing component 7.

[0046] For example, to enhance the flexibility and sealing performance of the pre-sealing assembly 7 as it moves within the channel, the pre-sealing assembly 7 comprises a bending member 71 and a peripheral sealing member 72. The bending member 71 is composed of a plurality of circular cylinders 711 arranged in parallel. Adjacent circular cylinders 711 engage in relative rolling engagement, allowing the bending member 71 to conform in shape to the angle between the transverse channel 622 and the oblique channel 611, achieving a flexible transition in direction and maintaining the continuity of the overall structure. The peripheral sealing member 72 is a rubber sealing layer 721 that covers the exterior of the bending member 71. This rubber sealing layer 721 not only provides sealing but also serves as a structural integration function, integrating the plurality of circular cylinders 711 into an integrated structure. This prevents the pre-sealing assembly 7 from having its components dispersed during sliding, further enhancing the stability of movement within the channel.

[0047] It can be understood that the material selected for the rubber sealing layer 721 should have high strength, good corrosion resistance and moderate elasticity to adapt to the complex working conditions of the pre-sealing component 7 during the valve discharge process. In the design, the length and width of the oblique channel 611 and the transverse channel 622 are matched with the geometric dimensions of the pre-sealing component 7, so that the rubber sealing layer 721 is always in a passive extrusion state during the sliding process. This state helps to form effective contact between the outer surface of the rubber sealing layer 721 and the inner wall of the channel, closing any gaps that may exist between the outer surface of the pre-sealing component 7 and the channel wall. This extrusion state can, to a certain extent, limit the risk of the fluid medium entering the channel through the through hole 621 and further leaking to the outside through the oblique channel 611 when the valve is in the discharge state, thereby improving the sealing stability of the entire sewage valve.

[0048] Furthermore, to ensure smooth movement of pre-sealing assembly 7 and further reduce frictional resistance, the inner wall of the channel can be coated with a polytetrafluoroethylene layer. Polytetrafluoroethylene exhibits excellent self-lubrication and corrosion resistance, making it resistant to damage in complex operating environments such as high pressure, high temperature, and fluid erosion. Its low surface friction coefficient facilitates the axial movement of the rubber sealing layer 721 along the channel under continuous extrusion. By combining the sealing effect of the rubber sealing layer 721 with the sliding function of the polytetrafluoroethylene layer, the pre-sealing assembly 7 maintains excellent sliding properties even in the sealed state, enabling the pre-sealing assembly 7, driven by the connecting assembly 8, to maintain stable operation within complex paths.

[0049] During implementation, a connection is established between the connecting assembly 8 and the pre-sealing assembly 7. This connection can be achieved through structural bonding, mechanical snap fastening, or nested sleeve connection, ensuring that the connecting assembly 8 synchronously drives the pre-sealing assembly 7 during the movement of the valve stem 5. Due to the flexibility of the pre-sealing assembly 7, the connecting assembly 8 should have a certain degree of tolerance for deviation to accommodate the possible angular changes of the pre-sealing assembly 7 in the channel turning section, thereby avoiding structural stress concentration or jamming of the connection structure due to angular changes.

[0050] In summary, by configuring the pre-sealing assembly 7 as a bent member 71 comprised of multiple circular cylinders 711 that roll together, combined with a peripheral seal 72 and a matching channel structure, the pre-sealing assembly 7 can flexibly move within the multi-axial channel, maintaining its sealing capability during sliding. The extruded rubber sealing layer 721, combined with the polytetrafluoroethylene sliding layer, provides dual sealing and sliding functions. This not only enhances the stability and durability of the pre-sealing assembly 7, but also strengthens the overall impact and leakage resistance of the dual-seal structure, ultimately improving the reliability and service life of the entire drain valve structure under complex operating conditions such as high pressure and strong impact.

[0051] In some embodiments, Figure 1 、 Figure 2 As shown, this embodiment addresses the issue of sealing and flow-guiding compatibility between the through-hole 621 and the transverse channel 622, and in combination with the mobility characteristics and sealing requirements of the pre-sealing component 7, further proposes that the width of the oblique channel 611 or the transverse channel 622 be enlarged relative to the inner diameter of the through-hole 621, and that horizontal side grooves 623 connected to the transverse channel 622 be provided on the inner walls on both sides of the through-hole 621. Specifically, the horizontal side grooves 623 extend laterally along the through-hole 621, and their width is consistent with that of the transverse channel 622 and is larger than the inner diameter of the through-hole 621, thereby structurally forming a lateral expansion area of the through-hole 621. When the pre-sealing component 7 slides along the transverse channel 622 to the position of the through-hole 621, it can smoothly enter the horizontal side grooves 623, thereby expanding laterally in the through-hole 621 area and effectively shielding the through-hole 621.

[0052] As can be understood, since the pre-sealing assembly 7 comprises multiple rolling-fit circular cylinders 711, it is relatively flexible overall. Without a supporting structure, it is susceptible to deformation or shaking due to the impact of the fluid medium, which can affect the sealing contact state. However, the provision of the horizontal side grooves 623 provides a double-sided support constraint when the pre-sealing assembly 7 reaches the through-hole 621, constraining both ends of the pre-sealing assembly 7 within the constraints of the side grooves. This achieves a structurally horizontal fixing effect, helping the pre-sealing assembly 7 maintain a stable posture when impacted by the fluid medium, thereby achieving a reliable sealing effect within the through-hole 621.

[0053] In addition, combined Figure 1 、 Figure 2 and Figure 3 To prevent the pre-sealing assembly 7 from carrying residual media (such as sludge) within the horizontal side trough 623 into other channels during lateral movement, this embodiment further provides a dedicated drainage channel 631 within the transverse block 62 and the second oblique block 63. This drainage channel 631 curves downward and extends from one side of the through-hole 621. One end connects the through-hole 621 and the horizontal side trough 623, while the other end opens and communicates with the input chamber 11, forming a stable medium return path. As the pre-sealing assembly 7 moves into the horizontal side trough 623, its structural exterior can push some of the sludge and other media remaining within the horizontal side trough 623 to the end of the horizontal side trough 623. The presence of the drainage channel 631 provides a drainage path for this residual material, guiding it back through the drainage channel 631 to the input chamber 11, preventing impurities from accumulating or overflowing within the side trough. At the same time, the downwardly curved structure of drain channel 631 also helps further enhance the efficiency of medium discharge through gravity, thereby improving the cleanliness of valve body 1 and maintaining unobstructed fluid flow in the working area of pre-sealing assembly 7. In summary, the provision of a channel with a width greater than the inner diameter of through-hole 621, the horizontal side groove 623 connected thereto, and the auxiliary drain channel 631 not only enables pre-sealing assembly 7 to smoothly pass through and seal through-hole 621, but also provides structural stability and cleanliness support, enhancing the sealing reliability and self-cleaning ability of valve body 1 under complex operating conditions.

[0054] In some embodiments, combined Figure 2 、 Figure 3A clamping opening 6311 is provided at one end of the drain channel 631 near the through-hole 621. Clamping opening 6311 serves as the entrance to the drain channel 631 and features a gradually decreasing inner diameter from the direction approaching the through-hole 621 to the direction away from the through-hole 621, forming a tapered structure with a closed end. When the pre-sealing assembly 7 partially passes through the horizontal side groove 623 and enters the clamping opening 6311, the gradually shrinking structure of the clamping opening 6311 causes the rubber sealing layer 721 covering the pre-sealing assembly 7 to enter into structurally compressed contact with the inner wall of the clamping opening 6311, creating a certain degree of interference fit between its outer surface and the wall of the clamping opening 6311. This, in turn, provides additional radial limiting capability for the pre-sealing assembly 7 through the compression stop effect. Since the clamping port 6311 is arranged at the open end of the sewage discharge channel 631, this structure can provide further anti-displacement constraint when the pre-sealing component 7 is in the blocked state of the through hole 621, which is beneficial to enhance the stability of the through hole 621 during the sealing process, and avoid the pre-sealing component 7 from slipping or offsetting due to liquid flow impact or flow fluctuations, thereby improving its lateral sealing effect.

[0055] In addition, considering that the pre-sealing component 7 needs to slide on the inner walls of the oblique channel 611, the transverse channel 622, the horizontal side groove 623 and the clamping port 6311, the movement resistance is reduced as much as possible through structural optimization, which also plays a certain role in alleviating the wear of the peripheral seal 72. Therefore, a polytetrafluoroethylene layer is coated on the inner walls of the above-mentioned channels and limiting structures. The polytetrafluoroethylene layer material itself has the characteristics of low friction coefficient, high chemical stability, corrosion resistance, and anti-adhesion. Combined with the elastic matching structure of the rubber sealing layer 721 on the periphery of the pre-sealing component 7, it can still slide stably and continuously in a compressed state. The provision of this inner wall coating is not only beneficial to reducing the energy consumption of the pre-sealing component 7 during movement, but also reduces the wear between the rubber sealing layer 721 and the channel wall, thereby extending the service life of the sealing component while maintaining a reliable seal, and helping to improve the stability and adaptability of the overall valve body 1 structure under frequent opening and closing or complex working conditions. In combination with the above structure, the tapered structure of the clamping port 6311 in the drain channel 631 provides sealing, stopping and fixing functions, and cooperates with the polytetrafluoroethylene layer to provide a low-friction sliding environment, thereby achieving an organic combination of sealing reliability and movement smoothness, and further optimizing the comprehensive performance of the double-sealing structure valve sleeve 3 drain valve.

[0056] In some embodiments, combined Figure 1 、 Figure 2The connecting assembly 8 includes two parts: a driving member 81 and a guide member 82. The driving member 81 is arranged between the valve stem 5 and the pre-sealing assembly 7, and specifically includes a rotating ring 811, a transverse connecting rod 812, a vertical connecting rod 813 and an adhesive rod 814. An annular groove is provided on the outer surface of the end of the valve stem 5 away from the valve sleeve 3. The rotating ring 811 is arranged around the annular groove and can rotate freely relative to the valve stem 5. The transverse connecting rod 812 is connected to one side of the rotating ring 811 in a horizontal direction, and the other end of the transverse connecting rod 812 is vertically connected to the vertical connecting rod 813 downward, and the lower end of the vertical connecting rod 813 is connected to the adhesive rod 814. The adhesive rod 814 is used to bond and fix the upper area of the pre-sealing assembly 7. A guide body 821 is provided in the guide member 82 structure. The guide body 821 is vertically arranged on the outer top wall of the valve body 1, and a vertically extending guide groove 822 is provided inside the guide body. One end of the guide groove 822 is connected to the oblique channel 611, and the other end extends upward through the top of the guide body 821. The vertical connecting rod 813 is inserted through the guide groove 822, and the adhesive rod 814 is also located in the lower area of the guide groove 822. The guide groove 822 limits the movement direction of the vertical connecting rod 813 and the adhesive rod 814, thereby ensuring the stability of the pre-sealing assembly 7 in the longitudinal direction.

[0057] As can be understood, as the valve stem 5 rotates and drives its axial movement, the relative rotational relationship between the rotating ring 811 and the annular groove allows the valve stem 5 to rotate without interfering with the transverse connecting rod 812, thereby maintaining the drive mechanism's linear motion path. When the valve stem 5 rotates downward, the rotating ring 811 also vertically drives the transverse connecting rod 812, the vertical connecting rod 813, and the bonding rod 814 downward. At this time, the bonding rod 814 exerts a downward force on the pre-sealing assembly 7 at the bonding location, causing the pre-sealing assembly 7, constrained by the guide groove 822, to partially enter the transverse channel 622 and extend into the horizontal side groove 623, further into the clamping opening 6311 area of the drainage channel 631, thereby effectively blocking the through-hole 621. When the valve stem 5 rotates upward, the drive assembly also reverses its motion, and the pre-sealing assembly 7, guided by the various channels, moves in the recovery direction, gradually exiting the clamping opening 6311 and horizontal side groove 623, and returning to the transverse channel 622 area. Through the synergistic effect of the drive member 81 structure and the guide member 82 structure, on the one hand, a stable longitudinal thrust can be provided to enable the pre-sealing assembly 7 to move reliably between different channels. On the other hand, the guide groove 822 limits the sliding path of the vertical connecting rod 813 and the adhesive rod 814, which is beneficial to improving the smoothness and stability of the entire driving movement, and further improving the reliability of the repeated action of the sealing structure. In addition, structural terms such as the guide body 821, the guide groove 822 and the rotating ring 811 all have clear physical positions and functions, and there is no ambiguity, which is conducive to the accurate implementation of the technical solution. In summary, the structure of the connecting assembly 8 is beneficial to achieving precise driving and limiting guidance of the pre-sealing assembly 7 while maintaining the stability of the channel sealing, and provides key support for the valve sleeve 3 sewage valve with a double sealing structure in the present invention.

[0058] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0059] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0060] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other unless there is any conflict.

[0061] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A double-seal structure valve sleeve drain valve, characterized in that: The valve body (1) comprises a valve cover (2), a valve sleeve (3), a valve core (4) and a valve stem (5), wherein the valve body (1) has an input chamber (11), a valve chamber (12) and an output chamber (13) which are connected in sequence, the valve cover (2) is fixedly arranged on the valve body (1), the valve sleeve (3) is circumferentially provided with a plurality of openings (31) which are connected with the valve chamber (12) and the output chamber (13), the valve core (4) is axially slidable in the valve sleeve (3), a nut (21) is fixedly arranged on the valve cover (2), the valve stem (5) is threadedly inserted into the nut (21), and one end of the valve stem (5) passes through the valve cover (2) and is connected to the valve core (4); The valve body (1) further comprises an isolating member (6) and a pre-sealing assembly (7), wherein the isolating member (6) is arranged in the valve body (1) and is used to separate the valve cavity (12) and the input cavity (11), and a through hole (621) is provided on the isolating member (6) for connecting the valve cavity (12) and the input cavity (11), and the valve core (4) is configured to block the upper end opening of the through hole (621); The pre-sealing component (7) is arranged in the isolation member (6). The pre-sealing component (7) is configured to partially move out of the isolation member (6) and isolate the through hole (621) from the inside of the through hole (621) when the valve stem (5) pushes the valve core (4) to move from top to bottom and blocks the upper end opening of the through hole (621); and to move back from the inside of the through hole (621) to the isolation member (6) to open the through hole (621) when the valve stem (5) pulls the valve core (4) from bottom to top away from the upper end opening of the through hole (621).

2. A double-seal structure valve sleeve drain valve according to claim 1, characterized in that: The isolation member (6) comprises a first oblique blocking portion (61), a transverse blocking portion (62) and a second oblique blocking portion (63); wherein, The highest inclined end of the first oblique blocking portion (61) is connected to the inner top wall of the valve body (1), and the lowest inclined end is connected to the first end of the transverse blocking portion (62); The lowest inclined end of the second oblique blocking portion (63) is connected to the inner bottom wall of the valve body (1), and the highest inclined end is connected to the second end of the transverse blocking portion (62); The cross block (62) is located directly below the valve sleeve (3) and is axially sealed and connected to the valve sleeve (3); the through hole (621) is formed on the cross block (62) and is axially opposite to the inner cavity of the valve sleeve (3).

3. The double-seal structure valve sleeve drain valve according to claim 2, characterized in that: The valve sleeve (3) further comprises a connecting assembly (8), wherein the connecting assembly (8) is arranged between the valve stem (5) and the pre-sealing assembly (7), and the connecting assembly (8) is used to convert the axial movement of the valve stem (5) in the valve sleeve (3) into the movement of the pre-sealing assembly (7) between the isolation member (6) and the through hole (621).

4. A double-seal structure valve sleeve drain valve according to claim 3, characterized in that: An oblique channel (611) is provided in the first oblique blocking portion (61) along its own extension direction, and the oblique channel (611) passes through the outer wall of the valve body (1) and is communicated with the outside. A transverse channel (622) is provided in the transverse blocking portion (62) along its own extension direction, and a first end of the transverse channel (622) is communicated with the oblique channel (611), and a second end of the transverse channel (622) is communicated with the through hole (621). The pre-sealing assembly (7) is slidably provided in the oblique channel (611) and the transverse channel (622).

5. The double-seal structure valve sleeve drain valve according to claim 4, characterized in that: The pre-sealing component (7) comprises a bending part (71) and a peripheral sealing part (72), wherein the peripheral sealing part (72) is covered on the outside of the bending part (71), and the connecting component (8) is connected to the peripheral sealing part (72).

6. The double-seal structured valve sleeve drain valve according to claim 5, characterized in that: The bending member (71) is composed of a plurality of circular cylinders (711) arranged in parallel, and two adjacent circular cylinders (711) are relatively rolling-matched. The peripheral sealing member (72) is a rubber sealing layer (721), and the rubber sealing layer (721) is coated on the outside of the plurality of circular cylinders (711); The oblique channel (611) and the transverse channel (622) have the same length and width, and are compatible with the pre-sealing assembly (7); wherein, When the pre-sealing assembly (7) is in the oblique channel (611) or the transverse channel (622), the rubber sealing layer (721) is always in an extruded state to seal the gap between the rubber sealing layer (721) and the inner wall of the oblique channel (611) or the transverse channel (622).

7. A double-seal structured valve sleeve drain valve according to any one of claims 4 to 6, characterized in that: The width of the oblique channel (611) or the transverse channel (622) is greater than the inner diameter of the through hole (621). Horizontal side grooves (623) communicating with the transverse channel (622) are provided on both inner side walls of the through hole (621). A sewage discharge channel (631) communicating with both the horizontal side groove (623) and the through hole (621) is provided in the transverse block (62) and the second oblique block (63). The sewage discharge channel (631) is curved downward, and one end of the sewage discharge channel (631) away from the through hole (621) is open and communicates with the input chamber (11).

8. The double-seal structured valve sleeve drain valve according to claim 7, characterized in that: The sewage discharge channel (631) has a clamping opening (6311), which is the channel opening of the sewage discharge channel (631) close to the through hole (621). The clamping opening (6311) is configured to gradually reduce the inner diameter from the side close to the through hole (621) to the side away from the through hole (621), so that a portion of the pre-sealing component (7) enters the clamping opening (6311) through the horizontal side groove (623) and is squeezed and stopped by the inner wall of the clamping opening (6311).

9. The double-seal structured valve sleeve drain valve according to claim 8, characterized in that: The inner walls of the oblique channel (611), the transverse channel (622), the horizontal side groove (623) and the clamping opening (6311) are all covered with a polytetrafluoroethylene layer.

10. The double-seal structured valve sleeve drain valve according to claim 4, characterized in that: The connecting assembly (8) includes a driving member (81) and a guiding member (82); wherein, The driving member (81) includes a rotating ring (811), a transverse connecting rod (812), a vertical connecting rod (813) and a bonding rod (814); an annular groove is provided on the rod wall of the valve stem (5) away from the valve sleeve (3); the rotating ring (811) is rotatably sleeved in the annular groove; the transverse connecting rod (812) is horizontally connected to the rotating ring (811); the vertical connecting rod (813) is vertically connected to one end of the transverse connecting rod (812) away from the rotating ring (811); the bonding rod (814) is vertically connected to one end of the vertical connecting rod (813) away from the transverse connecting rod (812); and the bonding rod (814) is bonded to the pre-sealing assembly (7); The guide member (82) includes a guide body (821), the guide body (821) is vertically arranged on the outer top wall of the valve body (1), a guide groove (822) is vertically opened in the guide body (821), the guide groove (822) is connected to the oblique channel (611), the vertical connecting rod (813) is vertically inserted in the guide groove (822), and the bonding rod (814) is slidably arranged in the guide groove (822), and the part of the pre-sealing component (7) away from the transverse channel (622) is also located in the guide groove (822).

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