Check valve rocker shaft positioning structure and check valve

Abstract

This application discloses a rocker arm seat positioning structure and a check valve, relating to the field of valve technology. The positioning structure includes a valve body, a rocker arm seat, and a positioning assembly. The valve body has an installation groove. The rocker arm seat is detachably installed within the valve body. The positioning assembly includes a positioning rod and a limiting base. The positioning rod consists of a rod body and a positioning ball head at one end. The limiting base is installed at the bottom of the installation groove and has a lower positioning cavity. The rod body is connected to the rocker arm seat, and the positioning ball head is engaged within the lower positioning cavity to achieve circumferential positioning of the rocker arm seat within the valve body. The rocker arm seat has a self-sealing flow channel, one end of which communicates with the inner cavity of the valve body, and the other end communicates with the end of the positioning rod away from the positioning ball head. This channel directs fluid pressure to the end of the positioning rod and applies an axial thrust towards the positioning ball head to eliminate axial play and press the positioning ball head firmly into the lower positioning cavity.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to a rocker arm seat positioning structure for a check valve and a check valve. Background Technology

[0002] Internal pin check valves play a crucial role in fluid control systems, and the positioning stability of their rocker seat directly affects the valve's sealing performance and service life. Currently, the rocker seat positioning solutions commonly used in the industry have significant shortcomings. The first solution is a side-mounted pin positioning structure, which requires machining a special keyway on the valve body to fit the pin on the side of the rocker seat. However, keyway machining is highly dependent on slotting machines, which are rarely used in modern manufacturing environments, resulting in lengthy machining cycles, high costs, and difficulty in ensuring the geometric accuracy of the keyway, ultimately affecting positioning reliability. The second solution is a pin-fitting positioning structure, which requires drilling a pin hole on-site at the joint between the rocker seat and the valve body during valve assembly. This process not only significantly slows down the assembly process but, for large-diameter valves, where the rocker seat is deeply embedded inside the valve body, the large size of the pin hole limits the on-site drilling space, significantly increasing machining difficulty and easily introducing assembly errors.

[0003] Furthermore, while existing steel ball positioning structures attempt to simplify the manufacturing process by using a combination of horizontal and vertical holes to achieve steel ball positioning and avoid the mating step, the steel ball is directly embedded in the unprocessed holes. Under long-term fluid erosion and mechanical vibration, the hole wall and the steel ball surface wear rapidly, generating axial and circumferential play, causing the rocker seat to loosen, thus weakening the check valve's backflow prevention function and even leading to sealing failure. These defects collectively make it difficult for existing positioning structures to maintain stable performance during long-term operation, restricting the overall reliability and durability of the check valve.

[0004] Therefore, there is a need to provide a rocker arm seat positioning structure and a check valve that can accurately position the rocker arm seat and maintain stable performance during long-term operation. Summary of the Invention

[0005] The main purpose of this application is to provide a rocker seat positioning structure for a check valve and a check valve, aiming to solve the technical problem that the rocker seat positioning structure in the prior art is prone to loosening due to the lack of an axial play elimination mechanism, which affects the check valve's anti-reverse function.

[0006] To achieve the above objectives, this application provides a check valve rocker seat positioning structure, comprising: The valve body has a vertical mounting groove. A rocker arm seat, which is detachably mounted in the valve body; A positioning component is disposed between the valve body and the rocker arm seat to achieve circumferential positioning of the rocker arm seat; The positioning component includes a positioning rod and a limiting base. The positioning rod consists of a rod body and a positioning ball head disposed at one end of the rod body. The limiting base is installed at the bottom of the mounting groove, and the limiting base is provided with a lower positioning cavity; The rod body is connected to the rocker arm seat, and the positioning ball head is engaged in the lower positioning cavity to position the rocker arm seat in the valve body in the circumferential direction; The rocker arm seat is provided with a self-sealing flow channel. One end of the self-sealing flow channel is connected to the inner cavity of the valve body, and the other end is connected to the end of the positioning rod away from the positioning ball head, so as to lead the fluid pressure to the end of the positioning rod and apply an axial thrust to the positioning rod in the direction of the positioning ball head.

[0007] Optionally, the end of the positioning rod away from the positioning ball head is provided with a pressure chamber, and the pressure chamber has a mating interface communicating with the self-sealing flow channel; the rocker arm seat includes a seat body, and the radial outer surface of the seat body is provided with a mounting hole, the self-sealing flow channel is inclined with a lower inner surface and a higher outer surface and communicates with the mounting hole, the positioning rod is installed in the mounting hole, and the mating interface is inserted into the self-sealing flow channel.

[0008] Optionally, the positioning component further includes an elastic sleeve, which is installed in the mounting hole of the base. The elastic sleeve has a through mounting channel along the central axis, and the rod of the positioning rod is inserted into the mounting channel.

[0009] Optionally, a positioning block is provided on the radial outer surface of the rod, and an axially penetrating positioning groove is provided on the inner wall of the installation channel of the elastic sleeve. The positioning block conformally fits the positioning groove so that the positioning rod is confined in the installation channel in its circumference.

[0010] Optionally, the rod body is provided with an annular positioning rib in the middle, and the inner wall of the installation channel is provided with a positioning ring groove corresponding to the position of the positioning rib. The positioning rib engages with the positioning ring groove to position and limit the positioning rod in the axial direction of the positioning rod.

[0011] Optionally, the limiting base is further provided with a guide slope, which is tangent to the lower positioning cavity. The guide slope is used to guide the positioning ball head to slide into the lower positioning cavity during assembly.

[0012] Optionally, the rocker arm seat further includes a top plate detachably mounted on the top surface of the seat body, and the positioning assembly further includes a seal, the seal being inserted into the mounting groove, and the top plate being pressed against the top surface of the seal; The bottom of the seal is provided with an upper positioning cavity, which and the lower positioning cavity are closed to form a positioning cavity that conforms to the positioning ball head, so as to clamp and position the positioning ball head.

[0013] Optionally, the bottom of the seal is further provided with a sealing slope that abuts and fits against the guide slope.

[0014] Optionally, the lower diameter of the seat is smaller than the upper diameter, and the diameter of the top plate is larger than the upper diameter of the seat, so that the rocker arm seat has a three-stage stepped structure; the valve body has three corresponding positioning steps, and the rocker arm seat is successively connected to each of the positioning steps and fixed.

[0015] This application also provides a check valve, including the check valve rocker seat positioning structure as described above.

[0016] The beneficial effects achieved by this application are as follows: The rocker arm seat is engaged with the lower positioning cavity of the limiting base by the positioning ball head of the positioning rod, realizing the circumferential positioning of the rocker arm seat within the valve body. Since the engagement between the positioning ball head and the lower positioning cavity eliminates the need for machining keyways on the valve body or performing on-site drilling, it avoids the problems of low processing efficiency, high cost, and difficult assembly caused by reliance on slotting machines or component assembly in existing technologies. Simultaneously, the self-sealing flow channel within the rocker arm seat directs the fluid pressure within the valve body cavity to the end of the positioning rod away from the positioning ball head, applying an axial thrust towards the positioning ball head. This axial thrust actively presses the positioning ball head into the lower positioning cavity, thereby continuously eliminating axial play that may occur between the positioning rod and the limiting base due to wear under the action of fluid pressure. Compared to existing technologies, this invention avoids the problem of loosening due to wear during long-term operation caused by the lack of an axial play elimination mechanism. It utilizes the fluid's own pressure to achieve adaptive compensation for axial play, avoiding loosening of the rocker seat due to increased play, ensuring the long-term stability of the rocker seat's circumferential positioning, and thus effectively maintaining the reliable anti-reverse function of the check valve. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 This is a schematic cross-sectional view of a check valve rocker seat positioning structure according to an embodiment of this application; Figure 2 for Figure 1 A magnified view of a portion of point A in the middle; Figure 3 This is a schematic diagram of the positioning rod in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the elastic sleeve in an embodiment of this application; Figure 5 This is a schematic diagram of the positioning rod in an embodiment of this application; Figure 6 This is a schematic diagram of the positioning rod in an embodiment of this application.

[0019] Figure label: 1-Valve body, 2-Rock arm seat, 3-Positioning assembly, 4-Positioning rod, 401-Pressure chamber, 402-Rod body, 403-Positioning ball head, 404-Positioning block, 405-Positioning rib, 406-Matching interface, 5-Elastic sleeve, 501-Installation channel, 502-Positioning groove, 503-Positioning ring groove, 6-Seal, 601-Upper positioning cavity, 602-Sealing slope, 7-Limiting base, 701-Lower positioning cavity, 702-Guide slope, 8-Seat body, 801-Self-sealing flow channel, 9-Top plate.

[0020] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0023] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0025] Example 1 Reference Figures 1-6 This embodiment provides a check valve rocker seat positioning structure, including: Valve body 1, the main structure of the check valve, forms a fluid passage inside and is used to install the valve disc and other components. Vertical mounting grooves are provided on valve body 1. The rocker arm seat 2 is a component inside the check valve that carries the rocker arm and enables its movement. The rocker arm seat 2 is detachably installed inside the valve body 1. Positioning component 3 is disposed between valve body 1 and rocker arm seat 2, and is used to achieve circumferential positioning of rocker arm seat 2; The positioning assembly 3 includes a positioning rod 4 and a limiting base 7. The positioning rod 4 consists of a rod body 402 and a positioning ball head 403 disposed at one end of the rod body 402. The limiting base 7 is installed at the bottom of the mounting groove and has a lower positioning cavity 701. The rod body 402 is connected to the rocker arm seat 2, and the positioning ball head 403 is engaged in the lower positioning cavity 701 to position the rocker arm seat 2 circumferentially within the valve body 1. More specifically, in this embodiment, the rod body 402 is cylindrical, and the positioning ball head 403 is hemispherical. The limiting base 7 is pressed and fixed to the bottom of the groove by an interference fit. The limiting base 7 has a lower positioning cavity 701, which is a quarter-spherical groove used to engage with the positioning ball head 403 to form a snap-fit ​​positioning, thereby effectively limiting the circumferential rotation of the rocker arm seat 2.

[0026] The rocker arm seat 2 is provided with a self-sealing flow channel 801. One end of the self-sealing flow channel 801 communicates with the inner cavity of the valve body 1, and the other end communicates with the end of the positioning rod 4 away from the positioning ball head 403. This allows fluid pressure to be directed to the end of the positioning rod 4, and an axial thrust is applied to the positioning rod 4 in the direction of the positioning ball head 403 to eliminate axial play and press the positioning ball head 403 tightly into the lower positioning cavity 701. Thus, when the valve body 1 is working, fluid pressure is directed to the end of the positioning rod 4, and an axial thrust is applied to the positioning rod 4 in the direction of the positioning ball head 403. This axial thrust causes the positioning rod 4 to be continuously pushed towards the limiting base 7. The application of the axial thrust eliminates the axial play between the positioning rod 4 and the limiting base 7, and presses the positioning ball head 403 tightly into the lower positioning cavity 701. In this way, even under fluctuating fluid pressure, the positioning ball head 403 can maintain close contact with the lower positioning cavity 701, thereby ensuring the stability and reliability of positioning.

[0027] Thus, in this embodiment, the positioning ball head 403 of the positioning rod 4 engages with the lower positioning cavity 701 of the limiting base 7, achieving circumferential positioning of the rocker arm seat 2. This avoids the inefficiency and high difficulty of traditional keyway machining or on-site drilling. Simultaneously, the self-sealing flow channel 801 guides fluid pressure to apply axial thrust to the positioning rod 4, effectively eliminating existing or long-term axial play and pressing the positioning ball head 403 firmly. This solves the problem of increased play due to wear affecting the check valve's backflow prevention effect in existing technologies, improving the long-term operational stability and reliability of the check valve.

[0028] As an optional implementation, the end of the positioning rod 4 away from the positioning ball head 403 is provided with a pressure-bearing cavity 401. The pressure-bearing cavity 401 has a mating interface 406 communicating with the self-sealing flow channel 801. The rocker arm seat 2 includes a seat body 8, and a mounting hole is opened on the radial outer surface of the seat body 8. The self-sealing flow channel 801 is inclined with a lower inner surface and a higher outer surface and communicates with the mounting hole. The positioning rod 4 is installed in the mounting hole, and the mating interface 406 is inserted into the self-sealing flow channel 801. In this embodiment, the pressure-bearing cavity 401 is a cavity or hole formed by machining at the end of the rod body 402, which is used to provide a working chamber for the introduced fluid pressure, thereby ensuring that the fluid pressure can be concentrated and effectively converted into an axial thrust pointing towards the positioning ball head 403. At the same time, in order to achieve effective introduction of fluid pressure, the pressure-bearing cavity 401 also has a mating interface 406. The mating interface 406 can be a simple opening or a port with a tapered or specific shape to facilitate the insertion and cooperation with the self-sealing flow channel 801, ensuring that the fluid smoothly enters the pressure-bearing cavity 401. In a preferred embodiment, the interface 406 is flared. The mounting holes on the radial outer surface of the base 8 are for accommodating and fixing the rod body 402 of the positioning rod 4. The inclined arrangement of the self-sealing flow channel 801 facilitates smooth fluid flow within the channel. During assembly, the positioning rod 4 is installed into the mounting hole, and its interface 406 is inserted into the corresponding port of the self-sealing flow channel 801. This insertion and connection method not only simplifies the installation process of the positioning rod 4 but also ensures that fluid pressure can be efficiently and leak-free transmitted from the self-sealing flow channel 801 to the pressure chamber 401 of the positioning rod 4 through the tight connection between the interface 406 and the self-sealing flow channel 801. Thus, this embodiment, by providing a pressure chamber 401 and an interface 406 at the end of the positioning rod 4 away from the positioning ball head 403, and by inserting the interface 406 into the inclined self-sealing flow channel 801 within the rocker arm base 2, forms an efficient and stable fluid pressure transmission path. The pressure chamber 401 provides a defined working space for the fluid pressure, ensuring that the fluid pressure can be concentrated and effectively converted into axial thrust pointing towards the positioning ball head 403. Simultaneously, the inclined design of the self-sealing flow channel 801, with its lower inner and higher outer sections, facilitates smooth fluid flow and prevents fluid stagnation, thus ensuring the continuity and stability of the axial thrust. The positioning rod 4 is installed in the base 8 through the mounting hole and connects to the self-sealing flow channel 801 via a plug-in connection. This not only simplifies the assembly process but also ensures effective transmission of fluid pressure, further enhancing the clamping effect between the positioning ball head 403 and the lower positioning chamber 701. This more reliably eliminates axial play and improves the circumferential positioning accuracy and stability of the rocker arm seat 2.

[0029] As an optional implementation, the positioning assembly 3 further includes an elastic sleeve 5, which is installed in the mounting hole of the base 8. The elastic sleeve 5 has a through mounting channel 501 along its central axis, and the rod body 402 of the positioning rod 4 is inserted into the mounting channel 501. In this embodiment, the elastic sleeve 5 is a cylindrical component with a certain degree of elasticity and flexibility, made of wear-resistant and corrosion-resistant elastic material, such as rubber, fluororubber, silicone rubber, polytetrafluoroethylene, or polyurethane. The elastic sleeve 5 serves as a buffer, guide, and sealing element between the rod body 402 of the positioning rod 4 and the mounting hole of the base 8 to reduce direct contact wear and provide a certain degree of elastic support. The elastic sleeve 5 is firmly installed in the mounting hole of the base 8 by means of interference fit, press fit, or bonding to ensure that the elastic sleeve 5 will not shift or loosen during operation, providing a reliable support foundation for the stable operation of the positioning rod 4. In a preferred embodiment, the elastic sleeve 5 has a quadrangular prism structure, which effectively avoids unexpected circumferential rotation after installation, further improving the accuracy and stability of positioning. An internal installation channel 501 is formed along the central axis of the elastic sleeve 5. Based on the material of the elastic sleeve 5, the rod 402 of the positioning rod 4 can be inserted into the installation channel 501 of the elastic sleeve 5 via an interference fit. The interference amount can be selected by those skilled in the art, but a smaller interference amount is preferred. The elastic properties of the elastic sleeve 5 allow it to tightly enclose the rod 402, providing good guidance while effectively absorbing impact and vibration, and forming a sealing barrier to prevent fluid leakage from the mating gap.

[0030] As an optional implementation, a positioning block 404 is provided on the radial outer surface of the rod 402, and an axially penetrating positioning groove 502 is provided on the inner wall of the mounting channel 501 of the elastic sleeve 5. The positioning block 404 conformally fits with the positioning groove 502, so that the positioning rod 4 is confined in the mounting channel 501 in its circumference. Specifically, in this embodiment, the positioning block 404 is a protrusion structure provided on the radial outer surface of the rod 402 of the positioning rod 4. Its function is to cooperate with the positioning groove 502 on the inner wall of the mounting channel 501 of the elastic sleeve 5 to restrict the circumferential rotation of the positioning rod 4, while not interfering with the axial movement of the positioning rod 4. As a preferred implementation, the positioning block 404 can be one or more protrusions, and its shape can be rectangular, trapezoidal, semi-circular, etc. Those skilled in the art can select and adjust it according to actual needs, depending on the form of cooperation with the positioning groove 502, but its main function is still to provide a circumferential constraint point. At the same time, the positioning groove 502 is a groove extending axially on the inner wall of the mounting channel 501 of the elastic sleeve 5. The sliding groove cooperates with the positioning block 404, allowing the positioning rod 4 to slide freely along the axial direction. Simultaneously, its sidewalls form a circumferential constraint on the positioning block 404, thus preventing circumferential rotation of the positioning rod 4 within the mounting channel 501. The number and shape of the positioning grooves 502 should match the positioning block 404 to ensure effective circumferential limiting. By setting the slidingly fitted positioning block 404 and positioning grooves 502, circumferential rotation or wobbling of the positioning rod 4 within the mounting channel 501 is effectively eliminated, ensuring precise circumferential positioning of the positioning rod 4 within the elastic sleeve 5. This avoids decreased positioning accuracy and potential wear problems caused by circumferential displacement, thereby improving the stability and reliability of the check valve rocker seat 2 positioning structure and ensuring the long-term stable operation of the check valve.

[0031] As an optional implementation, a ring-shaped positioning rib 405 is provided in the middle of the rod body 402. A positioning ring groove 503 is formed on the inner wall of the installation channel 501 corresponding to the position of the positioning rib 405. The positioning rib 405 engages with the positioning ring groove 503 to position and limit the positioning rod 4 in the axial direction. In this embodiment, the positioning rib 405 is a ring-shaped protrusion structure provided on the outer surface of the middle part of the rod body 402 of the positioning rod 4, and its cross-section is semi-circular. The ring-shaped rib is integrally formed on the rod body 402. The ring structure ensures that the positioning rod 4 has positioning capability in the entire circumference, and its placement in the middle helps to provide balanced axial support. Meanwhile, the positioning annular groove 503 is an annular groove on the inner wall of the installation channel 501 of the elastic sleeve 5 that corresponds to the positioning rib 405. The size and shape of the groove match the positioning rib 405. The positioning annular groove 503 can be formed by integral injection molding, compression molding, or subsequent processing (such as turning or milling) during the molding of the elastic sleeve 5. Its function is to provide a space for the positioning rib 405 to be accommodated and engaged, thereby achieving axial fixation of the positioning rod 4. By setting the mutually engaging positioning rib 405 and positioning annular groove 503, the problem of axial movement of the positioning rod 4 in the installation channel 501 is effectively solved. When the positioning rod 4 is inserted into the installation channel 501, the positioning rib 405 and the positioning annular groove 503 form a mechanical lock, thereby accurately positioning and reliably limiting the positioning rod 4 in the axial direction. This axial positioning and limiting mechanism, combined with the aforementioned circumferential limiting achieved through positioning block 404 and positioning groove 502, jointly ensures the stable position of positioning rod 4 within elastic sleeve 5. This prevents the positioning ball head 403 from being unstablely engaged with the lower positioning cavity 701 due to axial displacement of positioning rod 4. The engagement between positioning ball head 403 and lower positioning cavity 701 forms a dual positioning and locking structure for positioning rod 4, further enhancing the overall stability and reliability of the check valve rocker seat 2 positioning structure and extending the service life of the check valve.

[0032] As an optional implementation, the limiting base 7 is further provided with a guide slope 702, which is tangent to the lower positioning cavity 701. The guide slope 702 is used to guide the positioning ball head 403 into the lower positioning cavity 701 during assembly. In this embodiment, the guide slope 702 is a surface with a certain inclination angle, and its main function is to guide the positioning ball head 403 to move in a specific direction. The inclination angle and length of the guide slope 702 should be optimized according to factors such as the size, material, and assembly torque of the positioning ball head 403, which is understandable to those skilled in the art. For example, a conical surface that gradually slopes inward from the edge of the limiting base 7 to the entrance of the lower positioning cavity 701, or a gentle arc transition surface, can be used to provide sufficient guiding space. Furthermore, the guide ramp 702 is configured to be tangent to the lower positioning cavity 701, meaning the connection between the guide ramp 702 and the lower positioning cavity 701 is a smooth transition. This structure can be achieved through machining, such as CNC milling or mold forming, ensuring that the end of the guide ramp 702 seamlessly connects with the inlet edge of the lower positioning cavity 701, forming a continuous surface. This tangent design ensures that the positioning ball head 403 can smoothly transition into the lower positioning cavity 701 without obstruction when sliding on the guide ramp 702, avoiding possible jamming, impact, or wear due to structural abrupt changes, further improving the smoothness and reliability of assembly. More specifically, the guide ramp 702 is used to guide the positioning ball head 403 into the lower positioning cavity 701 during assembly; during the installation of the rocker seat 2 onto the valve body 1, the positioning ball head 403 on the positioning rod 4 will first contact the guide ramp 702 on the limiting base 7. The guide ramp 702, with its inclined surface, decomposes the vertical force on the positioning ball head 403 into a component force along the ramp direction, thereby guiding the positioning ball head 403 to slide along the ramp direction until it is accurately aligned and finally slides into the lower positioning cavity 701. Thus, by setting the guide ramp 702, this embodiment ensures that during the assembly of the check valve rocker seat 2, the positioning ball head 403 on the positioning rod 4 can be effectively guided by the guide ramp 702 on the limiting base 7, and slide smoothly along the guide ramp 702, ultimately accurately engaging into the lower positioning cavity 701. This greatly simplifies the alignment operation between the positioning ball head 403 and the lower positioning cavity 701, not only improving assembly efficiency and reducing assembly time, but also reducing the risk of component wear or damage due to inaccurate alignment, ensuring reliable installation of the positioning assembly 3 and normal operation of the check valve.

[0033] As an optional implementation, the rocker arm seat 2 also includes a top plate 9 detachably mounted on the top surface of the seat body 8, and the positioning assembly 3 includes a seal 6. The seal 6 is inserted into the mounting groove to fill and seal the mounting groove, and the top plate 9 is pressed against the top surface of the seal 6. The bottom of the seal 6 is provided with an upper positioning cavity 601, which, together with the lower positioning cavity 701, forms a positioning cavity conforming to the positioning ball head 403, thereby clamping and positioning the positioning ball head 403. In this embodiment, the top plate 9 has a plate-like structure, and the seal 6 is usually made of an elastic material, such as rubber, fluororubber, or polytetrafluoroethylene, to ensure that it can deform and fit tightly under pressure, thereby achieving an effective seal. The seal 6 can be tightly inserted into the mounting groove on the valve body 1, so as to completely fill the internal space of the mounting groove through its own elasticity, thereby blocking the mounting groove from the external environment and preventing external impurities from entering. After the top plate 9 is installed, its bottom contacts the top surface of the seal 6 tightly and applies pressure. This pressing action further compresses the seal 6, enhancing its sealing performance within the mounting groove and helping to firmly fix the seal 6 in place, preventing displacement during use. Simultaneously, the bottom structure of the seal 6 is designed with a groove matching the shape of the positioning ball head 403, namely the upper positioning cavity 601. The upper positioning cavity 601 and the lower positioning cavity 701 on the limiting base 7 are oppositely arranged, together forming an enclosure structure for the positioning ball head 403. When the seal 6 and the limiting base 7 are installed in place, the upper positioning cavity 601 and the lower positioning cavity 701 precisely align, forming a complete positioning cavity that highly matches the shape of the positioning ball head 403 of the positioning rod 4. The positioning ball head 403 is completely enclosed and tightly engaged within this positioning cavity, thereby providing bidirectional and more comprehensive support and limiting for the positioning ball head 403 in both the circumferential and axial directions, significantly enhancing the stability and reliability of the positioning.

[0034] As an optional implementation, the bottom of the seal 6 is further provided with a sealing slope 602 that abuts against and fits against the guide slope 702. In this embodiment, a sealing slope 602 is specially provided at the bottom of the seal 6. The shape and angle of the sealing slope 602 are perfectly matched with the guide slope 702 on the limiting base 7. When the seal 6 is installed and pressed into place, the two slopes can tightly abut and fit against each other, thereby forming a continuous and effective sealing interface. By providing a sealing slope 602 that abuts against and fits against the guide slope 702, the gap that may exist between the seal 6 and the limiting base 7 in the area of ​​the guide slope 702 is effectively eliminated, thereby significantly improving the sealing performance in this area.

[0035] As an optional implementation, the lower diameter of the seat 8 is smaller than the upper diameter, and the diameter of the top plate 9 is larger than the upper diameter of the seat 8, so that the rocker arm seat 2 has a three-stage stepped structure; the valve body 1 has three positioning steps, and the rocker arm seat 2 is successively connected to each level of the positioning steps and fixed.

[0036] In this embodiment, the rocker arm seat 2 has a three-tiered stepped structure, which not only provides it with good structural strength, but more importantly, it provides multiple positioning and support interfaces for the precise and stable installation of the rocker arm seat 2 within the valve body 1. During assembly, each step of the rocker arm seat 2 will sequentially and precisely overlap onto the corresponding three-tiered positioning steps of the valve body 1. This step-by-step overlapping method ensures multi-point support and positioning of the rocker arm seat 2 in both the radial and axial directions. Once the rocker arm seat 2 is fully in place, it will be reliably fixed within the valve body 1, for example, by the clamping action of the top plate 9 or additional fasteners, thereby preventing displacement or loosening during the operation of the check valve.

[0037] Example 2 This embodiment provides a check valve, including the check valve rocker seat positioning structure as described above.

[0038] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A rocker arm seat positioning structure for a check valve, characterized in that, include: The valve body has a vertical mounting groove. A rocker arm seat, which is detachably mounted in the valve body; A positioning component is disposed between the valve body and the rocker arm seat to achieve circumferential positioning of the rocker arm seat; The positioning component includes a positioning rod and a limiting base. The positioning rod consists of a rod body and a positioning ball head disposed at one end of the rod body. The limiting base is installed at the bottom of the mounting groove, and the limiting base is provided with a lower positioning cavity; The rod body is connected to the rocker arm seat, and the positioning ball head is engaged in the lower positioning cavity to position the rocker arm seat in the valve body in the circumferential direction; The rocker arm seat is provided with a self-sealing flow channel. One end of the self-sealing flow channel is connected to the inner cavity of the valve body, and the other end is connected to the end of the positioning rod away from the positioning ball head, so as to lead the fluid pressure to the end of the positioning rod and apply an axial thrust to the positioning rod in the direction of the positioning ball head.

2. The check valve rocker seat positioning structure as described in claim 1, characterized in that, The positioning rod has a pressure chamber at one end away from the positioning ball head, and the pressure chamber has a mating interface communicating with the self-sealing flow channel; the rocker arm seat includes a seat body, and the radial outer surface of the seat body has an installation hole, the self-sealing flow channel is inclined with a lower inner surface and a higher outer surface and communicates with the installation hole, the positioning rod is installed in the installation hole, and the mating interface is inserted into the self-sealing flow channel.

3. The check valve rocker seat positioning structure as described in claim 2, characterized in that, The positioning component also includes an elastic sleeve, which is installed in the mounting hole of the base. The elastic sleeve has a through mounting channel along the central axis, and the rod of the positioning rod is inserted into the mounting channel.

4. The check valve rocker seat positioning structure as described in claim 3, characterized in that, A positioning block is provided on the radial outer surface of the rod body, and an axially penetrating positioning groove is provided on the inner wall of the installation channel of the elastic sleeve. The positioning block fits into the positioning groove so that the positioning rod is confined in the installation channel in its circumference.

5. The check valve rocker seat positioning structure as described in claim 4, characterized in that, The rod body has an annular positioning rib in the middle, and the inner wall of the installation channel has a positioning ring groove corresponding to the position of the positioning rib. The positioning rib engages with the positioning ring groove to position and limit the positioning rod in the axial direction.

6. The check valve rocker seat positioning structure as described in claim 1, characterized in that, The limiting base is also provided with a guide slope, which is tangent to the lower positioning cavity. The guide slope is used to guide the positioning ball head to slide into the lower positioning cavity during assembly.

7. The check valve rocker seat positioning structure as described in claim 6, characterized in that, The rocker arm seat also includes a top plate detachably mounted on the top surface of the seat body, and the positioning assembly also includes a seal, which is inserted into the mounting groove, and the top plate is pressed against the top surface of the seal; The bottom of the seal is provided with an upper positioning cavity, which and the lower positioning cavity are closed to form a positioning cavity that conforms to the positioning ball head, so as to clamp and position the positioning ball head.

8. The check valve rocker seat positioning structure as described in claim 7, characterized in that, The bottom of the seal is also provided with a sealing slope that abuts and fits against the guide slope.

9. The check valve rocker seat positioning structure as described in claim 7, characterized in that, The lower diameter of the seat is smaller than the upper diameter, and the diameter of the top plate is larger than the upper diameter of the seat, so that the rocker arm seat has a three-stage stepped structure; the valve body has three corresponding positioning steps, and the rocker arm seat is successively connected to each of the positioning steps and fixed.

10. A check valve, characterized in that, Includes the check valve rocker seat positioning structure as described in any one of claims 1-9.

Images