Valve sleeve blow-down valve of double-sealing structure

Abstract

The invention relates to a valve sleeve blow-down valve of a double-sealing structure, which relates to the technical field of valves and comprises a valve body, a valve cover, a valve sleeve, a valve core, a valve rod, a separator and a pre-sealing assembly. An input cavity, a valve cavity and an output cavity which are sequentially communicated are formed in the valve body, the valve sleeve is arranged in the valve cavity, a plurality of open holes are formed in the valve sleeve in the circumferential direction, and the valve element is axially arranged in the valve sleeve in a sliding mode. A nut is installed on the valve cover, the valve rod penetrates through the nut in a threaded mode and is connected with the valve element, the valve element is driven to move up and down through rotation of the valve rod, and on-off control is achieved. The separator is arranged in the valve body, used for separating the input cavity from the valve cavity and provided with a through hole, and the valve element can block an upper end opening of the through hole in the downward moving process. The pre-sealing assembly is arranged in the isolation piece and can be partially moved out structurally in the valve element blocking process, and the through hole is partitioned from the interior of the through hole. When the valve element moves upwards, the pre-sealing assembly synchronously retreats into the isolation piece. Fluid impact can be shared through the double-sealing structure, and the service life of the valve body is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of valves, and particularly to a valve sleeve drain valve with a double-sealing structure. Background Art

[0002] Currently, valves are mainly used in oil and gas well stations, long-distance oil and gas pipelines, oil depots, gas storage tanks, and liquefied natural gas receiving stations. Currently, most of the pressure vessel equipment in on-line operation is equipped with a drain valve device, which is convenient for draining the pressure equipment.

[0003] The working principle of the drain valve is as follows: The valve is opened or closed by the up and down movement of the valve core. When performing the draining operation, turn the handwheel to drive the valve core to move upward through the valve stem to a certain spatial distance from the upper end face of the valve port, and then 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, reverse the handwheel to drive the valve core to move downward to close the valve port to close the drain valve.

[0004] Due to the harsh working environment of the drain valve, during the draining operation, the sealing parts inside the valve will be damaged by the erosion of the high-speed fluid medium, resulting in the damage and failure of the sealing parts, and the valve is prone to leakage. Summary of the Invention

[0005] The embodiments of this application provide a valve sleeve drain valve with a double-sealing structure, which can make the valve not prone to leakage to at least partially solve the above technical problems.

[0006] To achieve the above object, this application provides a valve sleeve drain valve with a double-sealing structure, including a valve body, a valve cover, a valve sleeve, a valve core, and a valve stem. An input cavity, a valve cavity, and an output cavity that are sequentially communicated are provided inside the valve body. The valve cover is fixedly arranged on the valve body. The valve sleeve is circumferentially provided with a plurality of openings communicating with the valve cavity and the output cavity. The valve core is axially slidably arranged inside the valve sleeve. A nut is fixedly arranged on the valve cover. The valve stem is threadedly arranged inside the nut, and one end of the valve stem passes through the valve cover and is connected to the valve core. It further includes a separator and a pre-sealing assembly. The separator is arranged inside the valve body and is used to separate the valve cavity and the input cavity. A through hole communicating the valve cavity and the input cavity is provided on the separator. The valve core is configured to block the upper end opening of the through hole. The pre-sealing assembly is arranged inside the separator. The pre-sealing assembly is configured to, when the valve stem pushes the valve core to move downward from top to bottom to block the upper end opening of the through hole, partially move out from inside the separator and block the through hole from the inside of the through hole, and, when the valve stem pulls the valve core to move upward away from the upper end opening of the through hole, move back into the separator from the inside of the through hole to open the through hole.

[0007] Optionally, the separator includes a first inclined baffle portion, a transverse baffle portion, and a second inclined baffle portion; wherein, The highest inclined end of the first inclined baffle 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 baffle portion; The lowest inclined end of the second inclined baffle 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 baffle portion; The transverse baffle portion is located directly below the valve sleeve and is axially sealed to the valve sleeve, and the through hole is formed in the transverse baffle portion and is axially aligned with the inner cavity of the valve sleeve.

[0008] Optionally, a connection assembly is further included, and the connection assembly is arranged between the valve stem and the pre-sealing assembly. The connection assembly is used to convert the axial movement of the valve stem in the valve sleeve into the movement of the pre-sealing assembly between the separator and the through hole.

[0009] Optionally, an inclined channel is formed in the first inclined baffle portion along its own extending direction, and the inclined channel penetrates through the outer wall of the valve body and communicates with the outside. A transverse channel is formed in the transverse baffle portion along its own extending direction. The first end of the transverse channel is communicated with the inclined channel, and the second end of the transverse channel is communicated with the through hole. The pre-sealing assembly is slidably arranged in the inclined channel and the transverse channel.

[0010] Optionally, the pre-sealing assembly includes a bent member and an outer peripheral seal member. The outer peripheral seal member is wrapped around the outside of the bent member, and the connection assembly is connected to the outer peripheral seal member.

[0011] Optionally, the bent member is composed of a plurality of circular cylinders arranged in parallel in sequence, and adjacent two circular cylinders are in relative rolling fit. The outer peripheral seal member is a rubber seal layer, and the rubber seal layer is wrapped around the outside of the plurality of circular cylinders; The inclined channel and the transverse channel have the same length and width and are adapted to the pre-sealing assembly; wherein, When the pre-sealing assembly is in the inclined channel or the transverse channel, the rubber seal layer is always in a compressed state to close the gap between the rubber seal layer and the inner wall of the inclined channel or the transverse channel.

[0012] Optionally, the width of the inclined channel or the transverse channel is greater than the inner diameter of the through hole. Horizontal side grooves communicated with the transverse channel are provided on the two inner side walls of the through hole. A sewage discharge channel communicated with both the horizontal side groove and the through hole is provided in the transverse baffle portion and the second inclined baffle portion. The sewage discharge channel is bent downward, and the opening at the end of the sewage discharge channel far from the through hole is communicated with the input cavity.

[0013] Optionally, the sewage discharge channel has a clamping opening which is the channel opening of the sewage discharge channel close to the through hole side. The clamping opening is configured such that its inner diameter gradually decreases from the side close to the through hole to the side far from the through hole, so that after a part of the pre-sealing assembly enters the clamping opening through the horizontal side groove, it is pressed against the inner side wall of the clamping opening.

[0014] Optionally, polytetrafluoroethylene layers are provided on the inner walls of the inclined channel, the transverse channel, the horizontal side groove and the clamping opening.

[0015] Optionally, the connection assembly includes a driving member and a guiding member; wherein, The driving member includes a rotating ring, a transverse connecting rod, a vertical connecting rod and an adhesive rod. An annular groove is formed on the rod wall of the valve stem far 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 far from the rotating ring. The adhesive rod is vertically connected to one end of the vertical connecting rod far from the transverse connecting rod, and the adhesive rod is adhered to the pre-sealing assembly; The guiding member includes a guiding body which is vertically arranged on the outer top wall of the valve body. A guiding groove is vertically formed in the guiding body. The guiding groove is communicated with the inclined channel. The vertical connecting rod is vertically inserted into the guiding groove, and the adhesive rod is slidably arranged in the guiding groove. The part of the pre-sealing assembly far from the transverse channel is also located in the guiding groove.

[0016] The present invention has at least the following beneficial effects: By introducing a pre-sealing assembly on the basis of a conventional valve core sealing structure and arranging it inside the isolating member, the pre-sealing assembly can enter the through hole first to form an internal seal before the valve core closing action, and can also return to the inside of the isolating member with the valve core during the opening action, thus forming a two-stage and two-path seal control mechanism, having a certain degree of seal redundancy and seal continuity, being able to effectively buffer the concentrated action of the medium impact on a single seal surface during the valve opening and closing process, being beneficial to delaying the fatigue damage process of the seal structure, and improving the overall seal reliability. In terms of structural design, the present application clarifies the movement path and sealing position of the pre-sealing assembly, realizes that the through hole can be partially or completely blocked by the pre-sealing assembly before the valve core has completed the plugging, has the characteristics of progressive seal control, and can adapt to the multi-load environment of high-pressure and high-impact fluid media on the seal structure under sewage discharge conditions. In addition, by using the isolating member as a structural transition component, the input cavity and the valve cavity are divided into two relatively independent regions, which is beneficial to improving the management efficiency of the overall fluid path of the valve body, assisting in realizing the precise guiding and synchronous cooperation of the valve core and the pre-sealing assembly, and further improving the comprehensive performance of the sewage discharge valve in aspects such as opening and closing control, seal safety and structural durability. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] To more comprehensively understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, where the same reference numerals in the following description represent the same parts.

[0019] Figure 1 is a cross-sectional view of the valve sleeve sewage valve provided in an exemplary embodiment of the present disclosure; Figure 2 is a partial cross-sectional view showing the positional relationship between the isolation member and the pre-sealing assembly alone in an exemplary embodiment of the present disclosure; Figure 3 is Figure 2 an enlarged schematic view of part A in

[0020] Description of reference numerals: 1. Valve body; 11. Input cavity; 12. Valve cavity; 13. Output cavity; 2. Valve cover; 21. Nut; 3. Valve sleeve; 31. Opening; 4. Valve core; 5. Valve stem; 6. Isolation member; 61. First inclined blocking portion; 611. Oblique channel; 62. Transverse blocking portion; 621. Through hole; 622. Transverse channel; 623. Horizontal side groove; 63. Second inclined blocking portion; 631. Sewage discharge channel; 6311. Clamping opening; 7. Pre-sealing assembly; 71. Bent member; 711. Circular column; 72. Outer peripheral sealing member; 721. Rubber sealing layer; 8. Connection assembly; 81. Driving member; 811. Rotating ring; 812. Transverse connecting rod; 813. Vertical connecting rod; 814. Adhesive rod; 82. Guide member; 821. Guide body; 822. Guide groove. Detailed implementation manners

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0022] The present application provides a valve sleeve 3 sewage valve with a double-sealing structure, in combination with Figure 1 , Figure 2, which includes a valve body 1, a valve cover 2, a valve sleeve 3, a valve core 4 and a valve stem 5. An input cavity 11, a valve cavity 12 and an output cavity 13 are successively communicated inside the valve body 1. The valve cover 2 is fixedly installed at the upper position of the valve body 1, playing the functions of sealing and connection to prevent internal fluid from leaking outwards. The valve sleeve 3 is arranged in the valve cavity 12, and a plurality of openings 31 communicating with the valve cavity 12 and the output cavity 13 are circumferentially provided on the valve sleeve 3 for conducting fluid in the open state of the valve. The valve core 4 is arranged inside the valve sleeve 3 in a manner that can axially slide, and is used to achieve on-off control during the opening or closing process of the valve. A nut 21 is also fixedly provided on the valve cover 2. The valve stem 5 is threaded through 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. By rotating the valve stem 5, the valve core 4 can be driven to move axially, realizing the up and down sliding of the valve core 4 relative to the valve sleeve 3, so as to achieve the purpose of controlling the on-off of the fluid.

[0023] Furthermore, on the basis of the above structure, the valve sleeve 3 drain valve further includes a separator 6 and a pre-sealing assembly 7. The separator 6 is installed inside the valve body 1, located between the input cavity 11 and the valve cavity 12, and is used to structurally partition the input cavity 11 and the valve cavity 12. A through hole 621 is provided on the separator 6, and the through hole 621 realizes the communication between the input cavity 11 and the valve cavity 12 in terms of structure. The valve core 4 is configured to be able to block the upper opening of the through hole 621 during the downward movement, so that the valve enters the closed state and blocks the fluid passage. The pre-sealing assembly 7 is installed inside the separator 6 and has the structural characteristic of being axially movable. In the structural design, the pre-sealing assembly 7 can gradually move from the inside of the separator 6 to the internal space of the through hole 621 during the process of the valve core 4 being driven downward by the valve stem 5, and block the through hole from the inside of the through hole 621. When the pre-sealing assembly 7 completes all movements, the through hole 621 is completely blocked in the up and down directions.

[0024] It can be understood that during the valve closing process, due to the design feature that the pre-sealing assembly 7 gradually enters the through hole 621 prior to the valve core 4, in the initial stage of the blocking action, the pre-sealing assembly 7 can bear part of the impact of the fluid medium first, thus sharing the erosion of the medium impact on the upper end face of the valve core 4 to a certain extent. When the pre-sealing assembly 7 only partially enters the through hole 621, it has not completely blocked the entire through hole 621, and there is still a part of the fluid entering the valve cavity 12 through the unblocked gap and acting on the surface of the valve core 4. Therefore, the valve core 4 and the pre-sealing assembly 7 bear the medium impact at different stages during the valve closing process, having a buffering and impact-sharing effect. This structural arrangement helps to extend the service life of the pre-sealing assembly 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 drain valve in frequent operation scenarios.

[0025] Furthermore, the moving stroke of the pre-sealing assembly 7 and the speed of entering the through-hole 621 can be reasonably designed and adjusted according to the type of fluid medium, the flow rate, and the valve structure parameters, so as to endow it with good progressive plugging characteristics. The size of the through-hole 621 and the clearance between the pre-sealing assembly 7 and the through-hole 621 need to be set within a reasonable range that can achieve effective plugging without affecting the return of the assembly. The above structural design clearly defines the co-action mechanism between the pre-sealing assembly 7 and the valve core 4 during the closing process, avoiding the problem of sealing failure caused by asynchronous movement of the components.

[0026] Meanwhile, when the valve is opened, the valve stem 5 drives the valve core 4 to move upward, the valve core 4 gradually moves away from the upper opening of the through-hole 621, and the pre-sealing assembly 7 can also be retracted into the isolator 6 synchronously or delayed under the drive of the valve core 4, so that the through-hole 621 is reopened, and the fluid can enter the valve cavity 12 from the input cavity 11 and then flow to the output cavity 13. The entire process maintains the controllability of the operation and the coherence 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 assembly 7 and the valve core 4 in the double-sealing structure, the impact load can be effectively dispersed when the fluid passes at high speed, reducing the degree of fatigue damage of a single sealing part, thereby having a beneficial effect on the sealing reliability and service life of the entire sewage valve structure.

[0027] In some embodiments, in combination with Figure 1 , Figure 2 , the isolator 6 includes a first inclined blocking portion 61, a transverse blocking portion 62, and a second inclined blocking portion 63, and the three form an integral support and partition structure for realizing the physical isolation between the input cavity 11 and the valve cavity 12 and providing a bearing surface for the setting of the through-hole 621. Among them, the first inclined blocking portion 61 is an inclined structure, and its inclined direction extends downward from the inner top wall of the valve body 1. The highest end of the inclination is connected to the inner top wall of the valve body 1, and the lowest end of the inclination is connected to the first end of the transverse blocking portion 62, so that the first inclined blocking portion 61 structurally plays a supporting role in connecting the upper valve body 1 and the transverse blocking portion 62. The second inclined blocking portion 63 is also an inclined structure, and its inclined direction extends upward from bottom to top. The lowest end of the inclination is connected to the inner bottom wall of the valve body 1, and the highest end of the inclination is connected to the second end of the transverse blocking portion 62, thereby structurally completing the support of the isolator 6 for the lower valve body 1 and the transverse blocking portion 62. Through the structural settings of the first inclined blocking portion 61 and the second inclined blocking portion 63, the transverse blocking portion 62 forms an inclined support installation surface inside the valve body 1, having a certain degree of mechanical stability and flow guiding auxiliary function.

[0028] Furthermore, the horizontal blocking portion 62 is disposed directly below the valve sleeve 3 and forms a sealed connection with the valve sleeve 3 in the axial direction. Such a sealing structure can reduce the risk of fluid medium leakage to the non-working area structurally. The through hole 621 is opened on the horizontal blocking portion 62, and the through hole 621 is arranged axially opposite to the inner cavity of the valve sleeve 3, so as to realize the passage arrangement of fluid entering the valve cavity 12 from the input cavity 11 through the through hole 621. By arranging the through hole 621 on the horizontal blocking portion 62 and the position being axially 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 assembly 7 to block the through hole 621. The alignment relationship between the structures is clear and the functional cooperation is close, which is beneficial to the realization of the sealing function and the synchronous progress of the control action.

[0029] In this structure, the "highest inclined end" and the "lowest inclined end" are used to describe the structural features of the first inclined blocking portion 61 and the second inclined blocking portion 63 relative to the horizontal plane, in order to clearly explain their inclined directions and connection relationships, with clear spatial structure meanings, avoiding ambiguities caused by different understandings. Through the above structural arrangement, a stable installation and support system is formed on the spacer 6, and the setting area of the through hole 621 is reserved, providing an accurate position basis for the blocking function of the valve core 4 and the pre-sealing assembly 7, thereby improving the reliability of the sealing structure and the stable operation ability of the valve under high-pressure and high-speed working conditions to a certain extent.

[0030] In some embodiments, combined with Figure 1 , Figure 2 , the connecting component 8 is arranged between the valve stem 5 and the pre-sealing assembly 7. Its function is to convert the axial movement action of the valve stem 5 in the valve sleeve 3 into the corresponding movement of the pre-sealing assembly 7 between the spacer 6 and the through hole 621, so that the pre-sealing assembly 7 can complete the position switching synchronously or according to a set rhythm according to the action of the valve stem 5. The valve stem 5 and the valve core 4 are rigidly connected, 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 to drive the valve core 4 to move downward, the connecting component 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 inside the spacer 6, and then forms a sealed blockage in the through hole 621. When the valve stem 5 is rotated in the reverse direction to make the valve core 4 move upward, the connecting component 8 can drive the pre-sealing assembly 7 to move back inside the spacer 6, so that the through hole 621 is reopened and the fluid passage is restored.

[0031] It should be noted that in the description, the "connecting component 8" refers to a structural unit that can connect the valve stem 5 and the pre-sealing component 7 and transmit the movement of the valve stem 5 to drive the pre-sealing component 7 to move. This term needs to be strictly distinguished from the sealing component, the valve core 4 or the support structure to avoid misunderstanding. "Converting to the movement of the pre-sealing component 7 between the spacer 6 and the through-hole 621" means that the connecting component 8 enables the pre-sealing component 7 to partially extend into or withdraw from the through-hole 621 from inside the spacer 6 during the movement of the valve core 4 through mechanical cooperation, forming a switch between fluid sealing and passage opening. The overall structure enables the pre-sealing component 7 and the valve stem 5 to form a beneficial action linkage relationship through the setting of the connecting component 8, which has a certain positive impact on improving the stability of the sealing performance and the coordination of sharing the impact function.

[0032] In some embodiments, referring to Figure 1 , Figure 2 , to further improve the sealing reliability of the sewage discharge valve and the flexible movement ability of the pre-sealing component 7 in the complex channel, in this embodiment, an inclined channel 611 is formed inside the first inclined blocking portion 61 along its extending direction. The inclined channel 611 penetrates through the outer wall of the valve body 1 and communicates with the outside, and is used to form an inlet and outlet for the pre-sealing component 7; a transverse channel 622 is formed inside the transverse blocking portion 62 along its own extending direction. The first end of the transverse channel 622 communicates with the inclined channel 611, and the second end is connected to the through-hole 621. The pre-sealing component 7 is slidably arranged inside the inclined channel 611 and the transverse channel 622, and can complete the sliding process from inside the spacer 6 to inside the through-hole 621 under the drive of the connecting component 8. The design of the inclined 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 basis for the structural adaptability of the pre-sealing component 7.

[0033] Exemplarily, to improve the flexibility and sealing performance of the pre-sealing component 7 during movement in the channel, the pre-sealing component 7 includes a bending member 71 and an outer peripheral sealing member 72. The bending member 71 is composed of a plurality of circular cylinders 711 arranged in parallel in sequence. Relative rolling cooperation is provided between adjacent circular cylinders 711, so that the bending member 71 can conform to the angle between the transverse channel 622 and the inclined channel 611 in shape, complete the flexible transition of direction and maintain the continuity of the overall structure. The outer peripheral sealing member 72 is a rubber sealing layer 721, which is coated outside the bending member 71. The rubber sealing layer 721 not only provides a sealing function but also plays a role in structural integration, forming an integrated structure of a plurality of circular cylinders 711, avoiding the situation of component dispersion during the sliding process of the pre-sealing component 7, and further improving the stability of movement in the channel.

[0034] It can be understood that the material selection of the rubber sealing layer 721 should have high strength, good corrosion resistance, and appropriate elasticity to adapt to the complex working conditions of the pre-sealing assembly 7 during the valve sewage discharge process. In the design, the lengths and widths of the oblique channel 611 and the transverse channel 622 are matched with the geometric dimensions of the pre-sealing assembly 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, and closes the possible gaps between the outer surface of the pre-sealing assembly 7 and the channel wall. To a certain extent, this extrusion state can limit the risk of fluid medium leaking to the outside through the through hole 621 into the channel and further through the oblique channel 611 when the valve is in the sewage discharge state, and improve the sealing stability of the entire sewage discharge valve.

[0035] Furthermore, on the basis of realizing the smooth movement of the pre-sealing assembly 7, in order to further reduce the moving friction resistance, a polytetrafluoroethylene layer can be coated on the inner wall of the channel. The polytetrafluoroethylene material has excellent self-lubricity and corrosion resistance. It is not easily damaged under complex working environments such as high pressure, high temperature, and fluid erosion, and has a small surface friction coefficient, which is beneficial to the movement of the rubber sealing layer 721 along the axial direction of the channel under the continuous extrusion state. By combining the sealing function of the rubber sealing layer 721 and the guiding and sliding function of the polytetrafluoroethylene layer, the pre-sealing assembly 7 can still have good sliding characteristics in the sealed state, so that the pre-sealing assembly 7 driven by the connecting assembly 8 can operate continuously and stably in a complex path.

[0036] During the implementation process, there is a connection relationship between the connecting assembly 8 and the pre-sealing assembly 7. This connection relationship can adopt forms such as structural bonding, mechanical buckles, or nested sleeves to ensure the synchronous driving effect of the connecting assembly 8 on the pre-sealing assembly 7 during the movement of the valve stem 5. Since the structure of the pre-sealing assembly 7 is flexible, the connecting assembly 8 should have a certain offset tolerance ability to adapt to the possible angle changes of the pre-sealing assembly 7 at the turning section of the channel, and avoid the phenomenon of structural stress concentration or jamming of the connection structure due to angle changes.

[0037] In summary, by setting the pre-sealing assembly 7 as a bent member 71 composed of the rolling fit of multiple circular cylinders 711, and combining the outer peripheral seal 72 and the matching channel structure, the pre-sealing assembly 7 can move flexibly in the multi-axis channel and maintain the sealing ability during the sliding process. The rubber sealing layer 721 has dual functions of sealing and sliding under the extrusion state in cooperation with the polytetrafluoroethylene sliding layer, which not only improves the stability and durability of the pre-sealing assembly 7, but also enhances the overall impact resistance and leakage resistance of the double-sealing structure, and is beneficial to improving the working reliability and service life of the entire sewage discharge valve structure under complex working conditions such as high pressure and strong impact.

[0038] In some embodiments, such as Figure 1 、Figure 2 As shown, in view of the problem of the compatibility between the sealing and the diversion between the through hole 621 and the transverse channel 622, in combination with the moving characteristics and the sealing requirements of the pre-sealing assembly 7, the width of the inclined channel 611 or the transverse channel 622 is further designed to be enlarged relative to the inner diameter of the through hole 621, and horizontal side grooves 623 communicating with the transverse channel 622 are formed on the inner walls on both sides of the through hole 621. Specifically, the horizontal side grooves 623 extend transversely along the through hole 621, and their width is the same as that of the transverse channel 622 and is larger than the inner diameter of the through hole 621, forming a transverse expansion area of the through hole 621 in terms of structure. When the pre-sealing assembly 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 laterally expanding in the area of the through hole 621 and effectively blocking the through hole 621.

[0039] It can be understood that since the pre-sealing assembly 7 includes a plurality of circular cylinders 711 that are in rolling fit and has strong overall flexibility, it is prone to deformation or shaking under the impact of the fluid medium in the absence of a support structure, thereby affecting the sealing contact state. By providing the horizontal side grooves 623, bilateral support restrictions can be formed when the pre-sealing assembly 7 reaches the through hole 621, so that both ends of it are in the constraints of the side grooves, obtaining a lateral fixing effect in terms of structure, which is beneficial to the pre-sealing assembly 7 to maintain a stable posture when being impacted by the fluid medium, and further realizing a reliable sealing effect in the through hole 621.

[0040] In addition, in combination with Figure 1 、 Figure 2 and Figure 3In order to prevent the pre-sealing component 7 from bringing the medium (such as sludge) remaining in the horizontal side groove 623 into other channels during the lateral movement, this embodiment also provides a special drainage channel 631 inside the transverse block 62 and the second oblique block 63. The drainage channel 631 bends downward and extends from one side of the through hole 621, one end of which is connected to the through hole 621 and the horizontal side groove 623, and the other end is open and connected to the input chamber 11, which can form a stable medium return path. In the process of the pre-sealing component 7 moving into the horizontal side groove 623, its structural appearance can push some of the sludge and other media remaining in the horizontal side groove 623 to the end of the horizontal side groove 623, and the existence of the drainage channel 631 can provide a drainage path for such residues, guiding them to flow back to the input chamber 11 through the drainage channel 631, and avoiding the accumulation or overflow of impurities in the side groove. At the same time, the downward curved structure of the drainage channel 631 is also beneficial to further enhance the drainage efficiency of the medium through the action of gravity, thereby improving the cleanliness inside the valve body 1 and maintaining the fluid unobstructed state in the working area of the pre-sealing component 7. In summary, by providing a channel with a width greater than the inner diameter of the through hole 621, a horizontal side groove 623 connected thereto, and an auxiliary drainage channel 631, not only can the pre-sealing component 7 smoothly pass through and seal the through hole 621, but also the stability and cleanliness support can be obtained in the structure, thereby enhancing the sealing reliability and self-cleaning ability of the valve body 1 under complex working conditions.

[0041] In some embodiments, in combination Figure 2 , Figure 3 A clamping opening 6311 is provided at one end of the sewage channel 631 close to the through hole 621. The clamping opening 6311 is the entrance part of the sewage channel 631. Its structural feature is that the inner diameter gradually decreases from the direction close to the through hole 621 to the direction away from the through hole 621, that is, it presents a closed-end conical structure. When the pre-sealing component 7 partially passes through the horizontal side groove 623 and enters the clamping opening 6311, due to the structural characteristic that the channel opening of the clamping opening 6311 has a gradually shrinking structure, the rubber sealing layer 721 coated on the outside of the pre-sealing component 7 will have a structural extrusion contact with the inner wall of the clamping opening 6311 during the entry process, so that a certain degree of interference fit is formed between its outer surface and the wall surface of the clamping opening 6311, thereby providing additional radial restriction capability for the pre-sealing component 7 through the extrusion stop effect. Since the clamping port 6311 is arranged at the open end of the sewage discharge channel 631, the 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 deflecting due to liquid flow impact or flow fluctuation, thereby improving its lateral sealing effect.

[0042] In addition, considering that the pre-sealing assembly 7 needs to slide on the inner walls of the inclined channel 611, the transverse channel 622, the horizontal side groove 623, and the clamping port 6311, through structural optimization, its movement resistance is minimized as much as possible, which also plays a certain role in alleviating the wear of its outer peripheral seal 72. Therefore, a polytetrafluoroethylene layer is covered 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 seal layer 721 on the outer periphery of the pre-sealing assembly 7, it can still slide stably and continuously in the pressed state. Through the setting of this inner wall coating, it is not only beneficial to reduce the energy consumption of the pre-sealing assembly 7 during movement, but also can reduce the wear between the rubber seal layer 721 and the channel wall surface, thereby extending the service life of the sealing assembly while maintaining reliable sealing, and contributing to improving the stability and adaptability of the overall valve body 1 structure under frequent opening and closing or complex working conditions. Considering the above structure, the tapered structure of the clamping port 6311 in the sewage discharge channel 631 provides a sealing and fixing function, and cooperates with the polytetrafluoroethylene layer to provide a low-friction sliding environment, realizing the organic combination of sealing reliability and movement smoothness, and further optimizing the comprehensive performance of this double-sealing structure valve sleeve 3 sewage valve.

[0043] In some embodiments, in combination with Figure 1 , Figure 2 , the connecting assembly 8 includes two parts: a driving member 81 and a guiding member 82. The driving member 81 is partially disposed 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, and the rotating ring 811 is sleeved 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 the 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, and the adhesive rod 814 is used to adhesively fix the upper region of the pre-sealing assembly 7. In the structure of the guiding member 82, a guiding body 821 is provided, and the guiding body 821 is vertically arranged on the outer top wall of the valve body 1, and a vertically extending guiding groove 822 is provided inside it. One end of the guiding groove 822 communicates with the inclined channel 611, and the other end extends upward through the top of the guiding body 821. The vertical connecting rod 813 is inserted through the guiding groove 822, and the adhesive rod 814 is also located in the middle and lower region of the guiding groove 822. The guiding groove 822 restricts the moving direction of the vertical connecting rod 813 and the adhesive rod 814, thereby ensuring the movement stability of the pre-sealing assembly 7 in the longitudinal direction.

[0044] It can be understood that during the rotation of the valve stem 5 and its axial movement, the rotating ring 811 allows the valve stem 5 not to interfere with the transverse connecting rod 812 during rotational movement through the relative rotation relationship with the annular groove, enabling the drive structure to maintain a linear movement path. When the valve stem 5 rotates downward, the rotating ring 811 also drives the transverse connecting rod 812, the vertical connecting rod 813, and the bonding rod 814 to move downward in the vertical direction. At this time, the bonding rod 814 generates a downward thrust on the pre-sealing assembly 7 at the bonding part, causing the pre-sealing assembly 7 to partially enter the transverse channel 622 and extend into the horizontal side groove 623 under the constraint of the guiding groove 822, and then further enter the clamping port 6311 area of the sewage discharge channel 631, thereby effectively blocking the through hole 621. When the valve stem 5 rotates upward, the drive assembly also acts in the reverse direction, and the pre-sealing assembly 7 moves in the recovery direction under the guidance of each channel, gradually withdrawing from the clamping port 6311 and the horizontal side groove 623 and returning to the transverse channel 622 area. Through the coordinated action of the drive member 81 structure and the guide member 82 structure, on the one hand, it can provide a stable longitudinal thrust, enabling the pre-sealing assembly 7 to move reliably between different channels. On the other hand, the guiding groove 822 restricts the sliding paths of the vertical connecting rod 813 and the bonding rod 814, which is beneficial to improving the smoothness and stability of the entire driving movement and further enhancing the reliability of the repeated operation of the sealing structure. In addition, structural terms such as the guide body 821, the guiding groove 822, and the rotating ring 811 have clear physical positions and functions, without ambiguity, which is conducive to the accurate implementation of the technical solution. Generally speaking, the connection assembly 8 is beneficial in terms of structure to achieve precise driving and limit guiding of the pre-sealing assembly 7 while maintaining the sealing stability of the channels, providing key support for the sewage discharge valve of the double-sealing structure valve sleeve 3 in the present invention.

[0045] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0046] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0047] Among the embodiments, implementation manners, and related technical features of the present application, they can be combined and replaced with each other without conflict.

[0048] The above are only the preferred embodiments of the present application, and do not impose any formal restrictions on the present application. However, any simple modifications, equivalent changes and decorations 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 still fall within the scope of the technical solution of the present application.

Claims

1. A valve sleeve blowdown valve with a double-sealing structure, characterized in that, It includes a valve body (1), a valve cover (2), a valve sleeve (3), a valve core (4) and a valve rod (5). An input cavity (11), a valve cavity (12) and an output cavity (13) which are connected in sequence are arranged in the valve body (1). The valve cover (2) is fixedly arranged on the valve body (1). A plurality of openings (31) communicating with the valve cavity (12) and the output cavity (13) are circumferentially formed in the valve sleeve (3). The valve core (4) is axially slidably arranged in the valve sleeve (3). A nut (21) is fixedly arranged on the valve cover (2). The valve rod (5) is threadedly arranged in the nut (21), and one end of the valve rod (5) passes through the valve cover (2) and is connected to the valve core (4). It further includes a separator (6) and a pre-sealing assembly (7). The separator (6) is arranged in the valve body (1) and is used to separate the valve cavity (12) and the input cavity (11). A through hole (621) communicating the valve cavity (12) and the input cavity (11) is formed in the separator (6). The valve core (4) is configured to block the upper opening of the through hole (621). The pre-sealing assembly (7) is arranged in the separator (6). The pre-sealing assembly (7) is configured to partially move out of the separator (6) and block the through hole (621) from the inside when the valve rod (5) pushes the valve core (4) to move downward from top to bottom to block the upper opening of the through hole (621), and to move back into the separator (6) from the inside of the through hole (621) to open the through hole (621) when the valve rod (5) pulls the valve core (4) to move upward away from the upper opening of the through hole (621).

2. The valve sleeve blowdown valve with a double-sealing structure according to claim 1, characterized in that, The separator (6) includes a first inclined blocking portion (61), a transverse blocking portion (62) and a second inclined blocking portion (63); wherein, The highest inclined end of the first inclined 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 inclined 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 transverse blocking portion (62) is located directly below the valve sleeve (3) and is axially sealed to the valve sleeve (3). The through hole (621) is formed in the transverse blocking portion (62) and is axially aligned with the inner cavity of the valve sleeve (3).

3. The valve sleeve sewage discharge valve with a double-sealing structure according to claim 2, wherein, It further includes a connecting assembly (8). The connecting assembly (8) is arranged between the valve rod (5) and the pre-sealing assembly (7). The connecting assembly (8) is used to convert the axial movement of the valve rod (5) in the valve sleeve (3) into the movement of the pre-sealing assembly (7) between the separator (6) and the through hole (621).

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

5. The valve sleeve blowdown valve with a double-sealing structure according to claim 4, characterized in that, The pre-sealing assembly (7) includes a bending member (71) and an outer peripheral seal (72). The outer peripheral seal (72) covers the outside of the bending member (71), and the connecting assembly (8) is connected to the outer peripheral seal (72).

6. The valve sleeve sewage discharge valve with a double-sealing structure according to claim 5, characterized in that, The bending member (71) is composed of a plurality of circular cylinders (711) arranged in parallel in sequence. Adjacent two circular cylinders (711) are in relative rolling fit. The outer peripheral seal (72) is a rubber seal layer (721), and the rubber seal layer (721) covers the outside of the plurality of circular cylinders (711). The inclined channel (611) and the transverse channel (622) have the same length and width and are adapted to the pre-sealing assembly (7). Among them, When the pre-sealing assembly (7) is in the inclined channel (611) or the transverse channel (622), the rubber seal layer (721) is always in a compressed state to close the gap between the rubber seal layer (721) and the inner wall of the inclined channel (611) or the transverse channel (622).

7. A valve sleeve blowdown valve with a double-sealing structure according to any one of claims 4 to 6, characterized in that The width of the inclined 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 the two inner side walls of the through hole (621). A sewage discharge channel (631) communicating with both the horizontal side grooves (623) and the through hole (621) is provided in the transverse blocking portion (62) and the second inclined blocking portion (63). The sewage discharge channel (631) is bent downward, and the opening at one end of the sewage discharge channel (631) far from the through hole (621) communicates with the input cavity (11).

8. A valve sleeve sewage discharge valve with a double-sealing structure according to claim 7, characterized in that, The sewage discharge channel (631) has a clamping opening (6311). The clamping opening (6311) is the channel opening on the side of the sewage discharge channel (631) close to the through hole (621). The clamping opening (6311) is configured to have a gradually decreasing inner diameter from the side close to the through hole (621) to the side far from the through hole (621), so that after a part of the pre-sealing assembly (7) enters the clamping opening (6311) through the horizontal side groove (623), it is squeezed and abutted against the inner side wall of the clamping opening (6311).

9. A valve sleeve blowdown valve with a double-sealing structure according to claim 8, characterized in that, Polytetrafluoroethylene layers are covered on the inner walls of the inclined channel (611), the transverse channel (622), the horizontal side grooves (623) and the clamping opening (6311).

10. The valve sleeve blowdown valve with a double-sealing structure according to claim 4, characterized in that, The connecting assembly (8) includes a driving member (81) and a guiding member (82). Among them, The driving member (81) includes a rotating ring (811), a transverse connecting rod (812), a vertical connecting rod (813), and an adhesive rod (814). An annular groove is formed on the rod wall of the valve stem (5) far 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) far from the rotating ring (811). The adhesive rod (814) is vertically connected to one end of the vertical connecting rod (813) far from the transverse connecting rod (812), and the adhesive rod (814) is adhesively bonded to the pre-sealing assembly (7). The guiding member (82) includes a guiding body (821). The guiding body (821) is vertically arranged on the outer top wall of the valve body (1). A guiding groove (822) is vertically formed in the guiding body (821). The guiding groove (822) is communicated with the inclined channel (611). The vertical connecting rod (813) is vertically inserted into the guiding groove (822), and the adhesive rod (814) is slidably arranged in the guiding groove (822). The part of the pre-sealing assembly (7) far from the transverse channel (622) is also located in the guiding groove (822).

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