A long-life, self-lubricating, track-type shut-off valve

Abstract

This invention provides a long-life, self-lubricating, track-type gate valve, belonging to the field of valve technology. It includes a lower valve body, an upper valve body, an inner valve core, an outer valve core, a lead screw, and a positioning pin. The lead screw has a guide groove, the outer valve core has an inclined groove, and the inner valve core slides within the inclined groove. The lower valve body has a core baffle, and the outer valve core has a sealing post on its outer side. The lower valve body has a valve seat. The core baffle has an upper and lower chamber filled with lubricating oil. The core baffle has a channel connecting the lower chamber and the inclined groove. A piston plate is located in the lower chamber, and a push rod is mounted on the piston plate. A linkage sleeve is mounted on the lead screw, and a linkage surface is provided on the linkage sleeve. One end of the push rod abuts against the linkage surface, and a spring is mounted on the push rod. In this invention, the lead screw's lifting and lowering drives the push rod and piston plate to automatically pump lubricating oil into the inclined groove, significantly reducing wear between the inner valve core and the inclined groove and extending the valve's service life.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and specifically to a long-life, self-lubricating, track-type gate valve. Background Technology

[0002] A gate valve relies on the pressure of the valve stem to ensure a tight seal between the valve disc sealing surface and the valve seat sealing surface, thus preventing the flow of media. A conventional gate valve uses a ball with a circular through-hole as its opening and closing element. The ball rotates or moves up and down with the valve stem to achieve the opening and closing action. It is mainly used to cut off or connect the media in a pipeline, and can also be used for fluid regulation and control. It can also close one channel while connecting the other two.

[0003] Existing technology, patent CN220816616U, discloses a track stop valve, which includes a lower valve body, with an upper valve body detachably fixed to the top of the lower valve body. A lead screw is disposed inside the upper upper part of the upper valve body; a positioning pin is disposed on the upper inner side of the upper valve body; guide grooves are formed on the upper outer side of the lead screw at positions corresponding to the positioning pins, with the positioning pins on the same side extending into the inner side of the guide grooves on the same side; a valve core is disposed inside the lower valve body, and the valve core is movably connected to the lower valve body; the lower end of the lead screw... The valve core extends to the lower interior of the valve body and connects to the valve core. The valve core includes an outer core and an inner core. The outer core is vertically arranged inside the lower interior of the valve body. An inclined groove with an inclination of six degrees is formed on the inner side of the outer core. The inner core is arranged inside the inclined groove and is movably connected to the inclined groove. A core baffle is arranged on the upper inner side of the lower part of the valve body, above the valve core. The lower end of the lead screw passes through the core baffle and connects to the inner core. A sealing post is arranged on the outer side of the outer core. The end of the sealing post away from the outer core is truncated cone-shaped.

[0004] This patented design, through its integrated structural design, effectively replaces the traditional ball valve design, significantly reducing the precision required for gate valve manufacturing and lowering costs. The use of a locating pin and guide groove to guide the screw's movement reduces the torque required for switching and shortens the opening and closing time. However, with this track-mounted gate valve, the inner core needs to slide relative to the inclined groove each time it is opened or closed. Over time, this can lead to wear, preventing the outer core from moving laterally the required distance to form a seal between the sealing column and the valve seat. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a long-life, self-lubricating, track-type shut-off valve.

[0006] The technical solution adopted by this invention is as follows: This application provides a high-life self-lubricating track-type stop valve, including a lower valve body, an upper valve body, an inner valve core, and an outer valve core. The upper valve body is provided with a lead screw and a positioning pin. The lead screw is provided with a guide groove that cooperates with the positioning pin. The outer valve core is vertically disposed in the lower valve body and is provided with an inclined groove. The inner valve core is slidably disposed in the inclined groove. A core baffle is provided on the inner side of the upper end of the lower valve body and above the outer valve core. The lower end of the lead screw passes through the core baffle and connects to the inner valve core. A sealing post is provided on the outer side of the outer valve core. A valve seat is provided in the lower valve body. With the cooperation of the positioning pin and the guide groove, and the inner valve core and the inclined groove, the outer valve core has a first position where the sealing post and the valve seat are separated and a second position where the sealing post and the valve seat are sealed.

[0007] The core baffle has an upper cavity and a lower cavity, both filled with lubricating oil. A first one-way valve is installed on the partition between them. The core baffle has a channel connecting the lower cavity and the inclined groove, and a second one-way valve is installed in the channel. A piston plate is installed in the lower cavity, and a push rod is installed at one end of the piston plate. A linkage sleeve is installed on the lead screw, and a linkage surface is circumferentially provided on the linkage sleeve. The linkage surface gradually narrows upward along the axial direction of the lead screw. One end of the push rod extends out of the lower cavity and abuts against the linkage surface. A spring is installed on the push rod to keep the push rod in contact with the linkage surface. When the lead screw rises, the push rod slides along the linkage surface and is pressed towards the lower cavity, causing the volume of the lower cavity to decrease. When the lead screw descends, under the action of the spring, the push rod slides along the linkage surface, causing the volume of the lower cavity to increase.

[0008] In some embodiments, a linkage groove is provided on the linkage surface. The linkage groove has an arc-shaped bottom wall and smoothly transitions with the linkage surface. The end face of the push rod that abuts against the linkage surface is arc-shaped. When the outer valve core moves from the second position to the first position, the lead screw is in an upward state, and the push rod abuts against the linkage groove. When the outer valve core is in the first position, the lead screw will rotate, and the push rod slides out of the linkage groove and rotates circumferentially along the linkage surface.

[0009] In some embodiments, the upper end face of the inner valve core is provided with an oil guiding surface, which is obliquely downward toward the contact portion between the inner valve core and the inclined groove.

[0010] In some embodiments, an oil outlet hole is provided on the lowest side of the bottom wall of the inclined groove, an annular groove is provided on the outer bottom wall of the outer valve core, a storage cavity communicating with the annular groove is provided at the bottom of the lower valve body, the oil outlet hole communicates with the inclined groove and the annular groove, and an oil outlet is provided in the storage cavity.

[0011] In some embodiments, the lower valve body is provided with a first oil replenishment hole, and the core baffle is provided with a second oil replenishment hole coaxially disposed with the first oil replenishment hole. The first oil replenishment hole and the second oil replenishment hole are provided with oil replenishment connectors connected to the upper cavity.

[0012] In some embodiments, a movable cavity is provided on the side of the lower cavity near the lead screw, the top rod is slidably disposed along the movable cavity, a positioning plate is provided on the portion of the lead screw located in the movable cavity, and the spring is sleeved on the top rod and abuts against the positioning plate and the movable cavity.

[0013] In some embodiments, the outer valve core and the inner valve core are respectively provided with a first through hole and a second through hole in their middle portions. The first through hole and the second through hole face the same direction. The first through hole and the sealing post face right angles. A limit groove is provided in the inner bottom wall of the lower valve body. A limit pin is provided at the lower end of the outer valve core. The limit pin slides in conjunction with the limit groove.

[0014] In some embodiments, a sealing seat is provided in the lower valve body. The sealing seat and the valve seat are respectively located on both sides of the outer valve core. A first sealing part is provided on the side of the sealing seat away from the outer valve core. A slide rail is provided in the inner ring of the sealing seat. A sealing element is slidably disposed in the slide rail. A second sealing part is provided on the sealing element facing the first sealing part. A limit rod is provided in the lower valve body on the moving path of the sealing element. A compression spring is provided between one end of the sealing element and the limit rod. A roller is provided at the other end of the sealing element and abuts against the outer valve core. When the outer valve core is in the first position, the sealing post is separated from the valve seat and the first sealing part is separated from the second sealing part. When the outer valve core is in the second position, the sealing post is sealed to the valve seat and the first sealing part is sealed to the second sealing part.

[0015] In some embodiments, the limiting rod is provided with a sleeve portion, one end of the sealing member is sleeved on the sleeve portion and slides therewith, and the compression spring is located inside the sleeve portion.

[0016] In some embodiments, the outer wall of the outer valve core is provided with a groove circumferentially to cooperate with the roller.

[0017] The beneficial effects of the present invention are as follows: In the present invention, the push rod and piston plate are linked by the lifting of the lead screw, so as to realize the automatic pumping of lubricating oil into the inclined groove, which significantly reduces the wear between the inner valve core and the inclined groove and extends the service life of the valve. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0019] Figure 1 This is a schematic diagram showing the outer valve core of a high-life self-lubricating track-type shut-off valve in the second position according to the present invention.

[0020] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0021] Figure 3 for Figure 2 Enlarged view of point D in the middle;

[0022] Figure 4 for Figure 1 Enlarged view of point C in the middle;

[0023] Figure 5 This is a schematic diagram of the outer valve core in this invention;

[0024] Figure 6 This is a schematic diagram of the inner valve core in this invention;

[0025] Figure 7 This is a partial schematic diagram of the lead screw and linkage sleeve in this invention;

[0026] Figure 8 This is a schematic diagram showing the outer valve core of a high-life self-lubricating track-type shut-off valve in the first position according to the present invention.

[0027] Figure 9 for Figure 1 Enlarged view of point B in the middle;

[0028] Figure 10 This is a schematic diagram of a long-life self-lubricating track-type shut-off valve in the closed state according to the present invention;

[0029] Figure 11 This is a schematic diagram of a high-life self-lubricating track-type gate valve in the present invention in a disengaged state (i.e., the sealing column and the valve seat are separated).

[0030] Figure 12 This is a schematic diagram of a long-life self-lubricating track-type shut-off valve in the open state according to the present invention.

[0031] Reference numerals: 1 - Lower valve body, 2 - Upper valve body, 3 - Inner valve core, 4 - Outer valve core, 5 - Lead screw, 6 - Positioning pin, 7 - Guide groove, 8 - Inclined groove, 9 - Core baffle, 10 - Sealing column, 11 - Valve seat, 12 - Upper chamber, 13 - Lower chamber, 14 - First check valve, 15 - Channel, 16 - Second check valve, 17 - Piston plate, 18 - Push rod, 19 - Linkage sleeve, 20 - Linkage surface, 21 - Spring, 22 - Linkage groove, 23 - Oil guide surface, 24 - Oil outlet, 25 - Annular groove, 26 - Storage chamber, 27 - Oil outlet, 28 - First oil replenishment hole, 29 - Second oil replenishment hole, 30 - Oil replenishment connector, 31 - Moving chamber, 32 - Positioning plate, 33 - First through hole, 34 - Second through hole, 35 - 36 - Limiting groove, 37 - Limiting pin, 38 - Sealing seat, 39 - First sealing part, 40 - Slide, 41 - Sealing element, 42 - Second sealing part, 43 - Limiting rod, 44 - Compression spring, 45 - Roller, 46 - Sleeve part, 47 - Slide groove. Detailed Implementation

[0032] The following description provides specific application scenarios and requirements for this specification, intended to enable those skilled in the art to make and use the contents of this specification. Various partial modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but rather to the widest scope consistent with the claims.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "lateral", "radial", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element or component to have a specific orientation, or to be constructed and operated in a specific orientation.

[0034] It should be noted that the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different components and should not be construed as limiting the embodiments of this application.

[0035] It should be noted that the terms "installation," "setup," "equipped with," "connection," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral structures; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two devices, components, or parts.

[0036] It should be noted that the terms "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "in some embodiments," "exemplarily," and "for example" is intended to present related concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the above terms in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0037] Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] Regarding the accompanying drawings of this application, it should be clearly understood that the drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of this specification. It should also be understood that the drawings are not necessarily drawn to scale.

[0039] This application is an improvement on a high-life self-lubricating track-type gate valve disclosed in the prior art with patent publication number CN220816616U. In this track-type gate valve, the inner core needs to slide relative to the inclined groove each time it is opened and closed. Over time, this can easily lead to wear, which makes it impossible for the outer core to move laterally the required distance to form a seal between the sealing column and the valve seat.

[0040] Based on the above issues, such as Figures 1 to 12As shown, this application provides a high-life, self-lubricating, track-type shut-off valve, including a lower valve body 1, an upper valve body 2, an inner valve core 3, and an outer valve core 4. The upper valve body 2 is provided with a lead screw 5 and a positioning pin 6. The lead screw 5 is provided with a guide groove 7 that cooperates with the positioning pin 6. The upper and lower ends of the lead screw 5 are rotatably connected to the upper valve body 2 through multiple bearings. The top of the upper valve body 2 is provided with a nut that helically cooperates with the lead screw 5. The guide groove 7 is divided into upper and lower sliding grooves. The upper sliding groove is straight, and the lower sliding groove is helical. During the movement of the lead screw 5, the upper straight sliding groove cooperates with the positioning pin 6 to make the lead screw 5 move up and down, and the lower helical sliding groove cooperates with the positioning pin 6 to make the lead screw 5 rotate.

[0041] The outer valve core 4 is vertically disposed inside the lower valve body 1, and has an inclined groove 8. The inner valve core 3 is slidably disposed in the inclined groove 8. A core baffle 9 is disposed on the inner side of the upper end of the lower valve body 1 and above the outer valve core 4. The lower end of the lead screw 5 passes through the core baffle 9 and connects with the inner valve core 3. A sealing post 10 is disposed on the outer side of the outer valve core 4. A valve seat 11 is disposed inside the lower valve body 1. With the cooperation of the positioning pin 6 and the guide groove 7, and the inner valve core 3 and the inclined groove 8, the outer valve core 4 has a first position where the sealing post 10 and the valve seat 11 are separated, and a second position where the sealing post 10 and the valve seat 11 are sealed.

[0042] The lower valve body 1 has a limiting groove 35 on its inner bottom wall, and the lower end of the outer valve core 4 is provided with a limiting pin 36. The limiting pin 36 and the limiting groove 35 slide to restrict the movement trajectory of the outer valve core 4 and ensure the alignment accuracy of the sealing column 10 and the valve seat 11. For example, the limiting pin 36 is cylindrical, and the limiting groove 35 is an elongated hole provided along the moving direction of the outer valve core 4.

[0043] The outer valve core 4 and the inner valve core 3 are respectively provided with a first through hole 33 and a second through hole 34 in the middle part. The first through hole 33 and the second through hole 34 are oriented in the same direction, and the first through hole 33 and the sealing column 10 are oriented at a right angle.

[0044] With this configuration, rotating the screw nut via the handwheel drives the screw rod 5. Guided by the linear slide groove, the screw rod 5 rises, causing the inner valve core 3 to move upwards. Through the cooperation of the inner valve core 3 and the inclined groove 8, the outer valve core 4 moves laterally to the first position, causing the sealing column 10 and the valve seat 11 to separate. At this time, the outer valve core 4, the screw rod 5, and the limit pin 36 are on the same axis, and the first through hole 33 and the second through hole 34 are aligned. Further rotation of the screw nut, guided by the spiral slide groove, causes the screw rod 5 to drive the inner valve core 3 and the outer valve core 4 to rotate simultaneously, thus opening the valve. When the valve is opened, the first through hole 33 and the second through hole 34 increase the flow rate. When the valve needs to be closed, the screw 5 is driven by rotating the screw nut in the opposite direction through the handwheel. Under the guidance of the spiral groove, the screw 5 drives the inner valve core 3 and the outer valve core 4 to rotate simultaneously, so that the sealing post 10 on the outer valve core 4 is aligned with the valve seat 11, that is, it returns to the first position. Then, the screw nut is rotated again, and the screw 5 descends, so that the outer valve core 4 moves laterally to the second position, that is, the sealing post 10 and the valve seat 11 form a seal, and the first through hole 33 and the second through hole 34 are misaligned.

[0045] The core baffle 9 is provided with an upper cavity 12 and a lower cavity 13, which are filled with lubricating oil. A first one-way valve 14 is provided on the partition between the two, which only allows lubricating oil to flow from the upper cavity 12 into the lower cavity 13. The core baffle 9 is provided with a channel 15 connecting the lower cavity 13 and the inclined groove 8. A second one-way valve 16 is provided in the channel 15, which only allows lubricating oil to flow from the lower cavity 13 into the inclined groove 8. The structure of the one-way valve can refer to the one-way valve commonly used in the prior art, and will not be described in detail here. A piston plate 17 is disposed in the lower cavity 13. A push rod 18 is disposed at one end of the piston plate 17. A linkage sleeve 19 is disposed on the lead screw 5. A linkage surface 20 is disposed circumferentially on the linkage sleeve 19. The linkage surface 20 gradually tapers upward along the axial direction of the lead screw 5, that is, it has a conical slope structure. One end of the push rod 18 extends out of the lower cavity 13 and abuts against the linkage surface 20. A spring 21 is disposed on the push rod 18. The spring 21 is used to keep the push rod 18 in contact with the linkage surface 20. When the lead screw 5 rises, the push rod 18 slides along the linkage surface 20 and is pressed towards the lower cavity 13, so that the volume of the lower cavity 13 is reduced, and oil can be supplied to the inclined groove 8 through the second one-way valve 16. When the lead screw 5 descends, under the action of the spring 21, the push rod 18 slides along the linkage surface 20, so that the volume of the lower cavity 13 is increased, forming a negative pressure, and oil can be supplied from the upper cavity 12 through the first one-way valve 14. It draws in oil, completing the circulation and replenishment of lubricating oil.

[0046] The linkage surface 20 is provided with a linkage groove 22. The linkage groove 22 has an arc-shaped bottom wall and a smooth transition with the linkage surface 20. The end face of the push rod 18 that abuts against the linkage surface 20 is arc-shaped. The curved surface cooperation between the two can reduce relative wear and does not affect the rotation of the lead screw 5.

[0047] When the outer valve core 4 moves from the second position to the first position, the lead screw 5 is in an upward state, and the push rod 18 abuts against the linkage groove 22. At this time, it can supply oil to the inclined groove 8 once. When the outer valve core 4 is in the first position, the lead screw 5 will rotate, and the push rod 18 will slide out of the linkage groove 22 and rotate circumferentially along the linkage surface 20. At this time, as the lead screw 5 rotates, the push rod 18 slides circumferentially along the linkage surface 20 and continuously squeezes the lower cavity 13, which can supply oil to the inclined groove 8 a second time. This second oil supply achieves circumferential uniform oil supply with the rotation of the lead screw 5, which forms sufficient lubrication for the full contact position of the inner valve core 3 and the inclined groove 8, avoiding local dry friction.

[0048] The upper end face of the inner valve core 3 is provided with an oil guiding surface 23. The oil guiding surface 23 is obliquely downward toward the contact part between the inner valve core 3 and the inclined groove 8, which can guide the lubricating oil to flow precisely to the friction surface of the inner valve core 3 and the inclined groove 8, reduce oil splashing loss, and ensure that the lubricating oil acts efficiently on the area with the highest wear risk.

[0049] Since the bottom wall of the inclined groove 8 is inclined, an oil outlet 24 is provided on the lowest side of the bottom wall of the inclined groove 8. An annular groove 25 is provided on the outer bottom wall of the outer valve core 4. As the inner valve core 3 slides in the inclined groove 8, excess lubricating oil is squeezed to the oil outlet 24 and then flows into the annular groove 25. This can provide auxiliary lubrication to the contact parts of the outer valve core 4 and the lower valve body 1, and reduce the frictional resistance when the outer valve core 4 moves laterally.

[0050] Furthermore, the bottom of the lower valve body 1 is provided with a storage cavity 26 communicating with the annular groove 25, and the oil outlet 24 is connected to the inclined groove 8 and the annular groove 25. The storage cavity 26 is provided with an oil outlet 27 with a plug. The storage cavity 26 can store excess lubricating oil for a long time, avoiding the direct discharge of oil and causing waste. At the same time, by periodically opening the plug of the oil outlet 27, aged oil can be discharged to maintain the cleanliness of the lubrication system.

[0051] It is understood that a sealing structure is provided between the outer bottom wall of the outer valve core 4 and the outer ring of the annular groove 25 and the bottom of the lower valve body 1 to prevent lubricating oil leakage and contamination of the transported medium.

[0052] The lower valve body 1 is provided with a first oil replenishment hole 28, and the core baffle 9 is provided with a second oil replenishment hole 29 coaxially arranged with the first oil replenishment hole 28. The first oil replenishment hole 28 and the second oil replenishment hole 29 are provided with oil replenishment connectors 30 connected to the upper cavity 12. The oil replenishment connector 30 adopts a double compression sleeve structure and has a built-in one-way valve. When replenishing oil, there is no need to disassemble the valve body. New lubricating oil can be injected into the upper cavity 12 simply by connecting the oil replenishment connector 30 with a grease gun. The one-way valve can prevent external impurities from entering the lubrication system and ensure the cleanliness of the oil.

[0053] The lower cavity 13 has a movable cavity 31 on the side near the lead screw 5. The push rod 18 is slidably disposed along the movable cavity 31. A positioning plate 32 is disposed on the part of the lead screw 5 located in the movable cavity 31. The spring 21 is sleeved on the push rod 18 and abuts against the positioning plate 32 and the movable cavity 31. The positioning plate 32 has a groove that matches the spring 21, which can limit the radial deformation of the spring 21 and ensure that its elastic force acts stably on the push rod 18, avoiding the impact of spring tilt on the oil supply accuracy.

[0054] A sealing seat 37 is provided inside the lower valve body 1. The sealing seat 37 and the valve seat 11 are located on opposite sides of the outer valve core 4. A first sealing part 38 is provided on the side of the sealing seat 37 away from the outer valve core 4. A slide rail 39 is provided on its inner ring. A sealing element 40 is slidably disposed in the slide rail 39. A second sealing part 41 is provided on the sealing element 40 facing the first sealing part 38. A limit rod 42 is provided inside the lower valve body 1 on the moving path of the sealing element 40. One end of the sealing element 40 and the limit rod 42 are connected. A compression spring 43 is provided between the inner valve core 3 and the valve seat 11, and a roller 44 is provided at the other end of the spring to abut against the outer valve core 4. When the outer valve core 4 is in the first position, the sealing column 10 is separated from the valve seat 11 and the first sealing part 38 is separated from the second sealing part 41. When the outer valve core 4 is in the second position, the sealing column 10 is sealed to the valve seat 11 and the first sealing part 38 is sealed to the second sealing part 41. This constitutes a double sealing structure, which significantly improves the sealing reliability under high pressure or impurity media conditions. Furthermore, under the action of the compression spring 43, even if the inner valve core 3 and the inclined groove 8 are worn and the outer valve core 4 does not move laterally to the correct position, compensation is provided to ensure that at least one sealing structure forms an effective seal.

[0055] The limiting rod 42 is provided with a sleeve portion 45. One end of the sealing member 40 is sleeved on the sleeve portion 45 and slides with it. The compression spring 43 is located inside the sleeve portion 45. The sleeve portion 45 can isolate the compression spring 43 from the conveying medium, prevent the compression spring 43 from being corroded by the medium or stuck by impurities, and ensure its elasticity is stable.

[0056] The outer wall of the outer valve core 4 is provided with a circumferential groove 46 that cooperates with the roller 44, so that when the outer valve core 4 rotates, the roller 44 rolls smoothly along the groove 46.

[0057] In summary, after reading this detailed disclosure, those skilled in the art will understand that the foregoing detailed disclosure is presented by way of example only and is not restrictive. Although not explicitly stated herein, those skilled in the art will understand that the requirements of this application encompass various reasonable changes, improvements, and modifications to the embodiments. These changes, improvements, and modifications are intended to be made by this application and are within the spirit and scope of the exemplary embodiments of this application.

[0058] Furthermore, it should be understood that in the foregoing description of the embodiments of this application, various features are combined in a single embodiment, drawing, or description for the purpose of simplifying the understanding of a feature. However, this does not mean that the combination of these features is necessary, and those skilled in the art may readily identify some of the devices as separate embodiments when reading this application. That is, the embodiments in this application can also be understood as an integration of multiple sub-embodiments. It is also valid when each sub-embodiment contains fewer than all the features of a single foregoing disclosed embodiment.

[0059] Finally, it should be understood that the embodiments disclosed herein are illustrative of the principles of the embodiments of this application. Other modified embodiments are also within the scope of this application. Therefore, the embodiments disclosed herein are merely examples and not limitations. Those skilled in the art can adopt alternative configurations to implement the applications in this application based on the embodiments in this application. Therefore, the embodiments of this application are not limited to the embodiments precisely described in the application.

Claims

1. A long-life self-lubricating track-type gate valve, comprising a lower valve body, an upper valve body, an inner valve core, and an outer valve core, wherein the upper valve body is provided with a lead screw and a positioning pin, the lead screw is provided with a guide groove that cooperates with the positioning pin, the outer valve core is vertically disposed in the lower valve body and is provided with an inclined groove, the inner valve core is slidably disposed in the inclined groove, a core baffle is provided on the inner side of the upper end of the lower valve body and above the outer valve core, the lower end of the lead screw passes through the core baffle and connects to the inner valve core, a sealing post is provided on the outer side of the outer valve core, and a valve seat is provided in the lower valve body, wherein, with the cooperation of the positioning pin and the guide groove and the inner valve core and the inclined groove, the outer valve core has a first position where the sealing post and the valve seat are separated and a second position where the sealing post and the valve seat are sealed; Its features are: The core baffle has an upper cavity and a lower cavity, both filled with lubricating oil. A first one-way valve is installed on the partition between them. The core baffle has a channel connecting the lower cavity and the inclined groove, and a second one-way valve is installed in the channel. A piston plate is installed in the lower cavity, and a push rod is installed at one end of the piston plate. A linkage sleeve is installed on the lead screw, and a linkage surface is circumferentially provided on the linkage sleeve. The linkage surface gradually narrows upward along the axial direction of the lead screw. One end of the push rod extends out of the lower cavity and abuts against the linkage surface. A spring is installed on the push rod to keep the push rod in contact with the linkage surface. When the lead screw rises, the push rod slides along the linkage surface and is pressed towards the lower cavity, causing the volume of the lower cavity to decrease. When the lead screw descends, under the action of the spring, the push rod slides along the linkage surface, causing the volume of the lower cavity to increase.

2. The long-life self-lubricating track-type shut-off valve according to claim 1, characterized in that, A linkage groove is provided on the linkage surface. The linkage groove has an arc-shaped bottom wall and a smooth transition with the linkage surface. The end face of the push rod that abuts against the linkage surface is arc-shaped. When the outer valve core moves from the second position to the first position, the lead screw is in an upward state and the push rod abuts against the linkage groove. When the outer valve core is in the first position, the lead screw will rotate and the push rod will slide out of the linkage groove and rotate circumferentially along the linkage surface.

3. The long-life self-lubricating track-type shut-off valve according to claim 1, characterized in that, The upper end face of the inner valve core is provided with an oil guiding surface, which is obliquely downward toward the contact part between the inner valve core and the inclined groove.

4. The long-life self-lubricating track-type shut-off valve according to claim 1, characterized in that, The lowest side of the bottom wall of the inclined groove is provided with an oil outlet hole, the outer bottom wall of the outer valve core is provided with an annular groove, the bottom of the lower valve body is provided with a storage cavity communicating with the annular groove, the oil outlet hole communicates with the inclined groove and the annular groove, and the storage cavity is provided with an oil outlet.

5. A long-life self-lubricating track-type shut-off valve according to claim 1, characterized in that, The lower valve body is provided with a first oil replenishment hole, and the core baffle is provided with a second oil replenishment hole coaxially with the first oil replenishment hole. The first oil replenishment hole and the second oil replenishment hole are provided with oil replenishment connectors that are connected to the upper cavity.

6. The long-life self-lubricating track-type shut-off valve according to claim 1, characterized in that, A movable cavity is provided on the side of the lower cavity near the lead screw. The top rod is slidably disposed along the movable cavity. A positioning plate is provided on the part of the lead screw located in the movable cavity. The spring is sleeved on the top rod and abuts against the positioning plate and the movable cavity.

7. A long-life self-lubricating track-type shut-off valve according to claim 1, characterized in that, The outer valve core and the inner valve core are respectively provided with a first through hole and a second through hole in the middle part. The first through hole and the second through hole face the same direction. The first through hole and the sealing column face right angles. The inner bottom wall of the lower valve body is provided with a limit groove. The lower end of the outer valve core is provided with a limit pin. The limit pin slides and engages with the limit groove.

8. A long-life self-lubricating track-type shut-off valve according to claim 1, characterized in that, The lower valve body is provided with a sealing seat, which is located on both sides of the outer valve core, respectively. The sealing seat is provided with a first sealing part on the side away from the outer valve core, and a slide rail is provided on its inner ring. A sealing element is slidably arranged in the slide rail. A second sealing part is provided on the sealing element facing the first sealing part. A limit rod is provided in the lower valve body on the moving path of the sealing element. A compression spring is provided between one end of the sealing element and the limit rod, and a roller is provided at the other end of the sealing element to abut against the outer valve core. When the outer valve core is in the first position, the sealing column is separated from the valve seat and the first sealing part is separated from the second sealing part. When the outer valve core is in the second position, the sealing column is sealed to the valve seat and the first sealing part is sealed to the second sealing part.

9. A long-life self-lubricating track-type shut-off valve according to claim 8, characterized in that, The limiting rod is provided with a sleeve portion, one end of the sealing member is sleeved on the sleeve portion and slides with it, and the compression spring is located inside the sleeve portion.

10. A long-life self-lubricating track-type shut-off valve according to claim 8, characterized in that, The outer wall of the outer valve core is provided with a groove in the circumferential direction to cooperate with the roller.

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