A compensating seal swing check valve

Abstract

The utility model discloses a kind of compensation type sealed swing check valves, including valve body, valve seat, valve plate and the sealing compensation component being arranged on valve seat.Sealing compensation component includes connecting seat, elastic fixing seat and air bag, and the annular petal of elastic fixing seat two sides is respectively embedded in corresponding guide groove and is limited.Valve plate closes, and inner ring groove cover is pressed elastic fixing seat, and its middle part is compressed air bag by inner core, and air bag is deformed to let room groove;Valve plate opens, and elastic fixing seat and air bag are collectively reset.Sealing ring between annular petal and guide groove is used to isolate medium impurities.The structure is sealed by elastic deformation to compensate, reduce rigid sliding abrasion and the influence of impurities on compensation part, and it is conducive to improving the working stability and service life of compensation part.

Description

Technical Field

[0001] This utility model relates to the field of check valve technology, specifically to a compensated sealing swing check valve. Background Technology

[0002] A swing check valve typically consists of a valve body, a valve seat, and a valve plate that can rotate about an opening and closing axis. When the medium flows in the forward direction, the valve plate opens; when the medium stops flowing or backflow occurs, the valve plate rotates to the closed position and cooperates with the valve seat to form a seal.

[0003] To compensate for wear on the sealing parts, assembly errors, and positional changes that occur after long-term use, various compensating sealing structures already exist in existing swing check valves. For example, a movable sealing seat is provided on the valve seat or valve plate, and a compensating force is provided to the sealing seat through a spring, elastic element, or other rebound structure, so that the sealing seat can move or rebound within a certain range.

[0004] However, some existing sealing compensation structures rely on the sliding fit between the moving parts and the guide groove to obtain the compensation stroke, which requires high machining and assembly precision for the moving parts, guide grooves, and elastic components. After long-term opening and closing of the check valve, the moving parts are prone to wear, and the clearance may increase accordingly. At the same time, mud, rust, and wear debris in the medium can easily enter the moving parts or the areas where springs and other rebound structures are located, which may cause increased resistance to the movement of the moving parts, damage to the elastic components, or affect the rebound action.

[0005] Therefore, although the existing compensating sealing structure can provide a certain degree of sealing compensation, its compensating components are still susceptible to wear and tear and the influence of media impurities. There is still room for further improvement in the working stability and service life of the compensating components. Utility Model Content

[0006] The present invention aims to provide a compensating seal swing check valve to improve the problem that the compensating component in the existing partial sealing compensation structure is easily affected by wear of moving parts and media impurities.

[0007] A compensating seal swing check valve includes a valve body, a valve cover disposed on the valve body, an opening and closing shaft, and a valve seat disposed in the flow channel of the valve body, wherein the valve seat is provided with a sealing compensation component.

[0008] The sealing compensation assembly includes a connecting seat and a spring mechanism disposed on the connecting seat. The spring mechanism has an elastic fixing seat, on both sides of which are respectively formed outwardly curved annular lobes; the connecting seat is provided with guide grooves at positions corresponding to the two annular lobes, and the two annular lobes are respectively embedded in the corresponding guide grooves. The groove walls of the guide grooves limit the movement of the annular lobes along the pressure direction of the elastic fixing seat.

[0009] An air bladder is provided between the elastic fixing seat and the connecting seat. When the portion of the elastic fixing seat located between the two annular petals is compressed, the two annular petals remain within the corresponding guide grooves, causing the portion of the elastic fixing seat located between the two annular petals to elastically deform toward the air bladder, and compressing the air bladder. The elastic recovery of the elastic fixing seat and the air bladder together provide sealing compensation.

[0010] Furthermore, the valve body is provided with a valve plate connected to the opening and closing shaft, and the valve plate has an inner ring groove on the side facing the sealing compensation component; when the valve plate is closed, the inner ring groove presses against the elastic fixing seat and restricts the elastic fixing seat from deforming outward, so that the part of the elastic fixing seat located between the two annular petals undergoes elastic deformation toward the airbag.

[0011] Furthermore, the elastic fixing seat is wrapped with an inner core, and the airbag is pressed on the side of the inner core facing the connecting seat; when the elastic fixing seat is squeezed and deformed by the inner ring groove, it squeezes the inner core, and the inner core transmits the pressure to the airbag.

[0012] Furthermore, the connecting seat is provided with a relief groove at a position corresponding to the airbag, and the airbag is annular; after the airbag is squeezed by the inner core, its deformed part extends into the relief groove.

[0013] Furthermore, each of the two annular petals has a recess opposite to the corresponding guide groove, and two sealing rings are respectively disposed in the corresponding recesses and respectively seal with the groove wall of the corresponding guide groove to reduce the entry of external media and impurities into the inner core and the area where the airbag is located.

[0014] Furthermore, the connecting seat is provided with a slot, which engages with the valve seat to install the sealing compensation component onto the valve seat.

[0015] Compared with existing technologies, this invention utilizes guide grooves to limit the annular petals, allowing the elastic fixing seat to primarily compensate for the stroke through its own deformation. This reduces the impact of wear caused by repeated sliding of rigid moving parts on the compensation action. The inner core transmits the pressure on the elastic fixing seat to the airbag, while the clearance groove provides space for the airbag's compressive deformation. The sealing ring creates a certain degree of sealing and isolation between the inner core and the area where the airbag is located, reducing the entry of media impurities into this area. Therefore, this structure can achieve sealing compensation while protecting the airbag and related compensation components, which is beneficial for maintaining the operational stability and service life of the sealing compensation assembly. Attached Figure Description

[0016] Figure 1 A cross-sectional schematic diagram of the overall structure of a compensated-seal swing check valve; Figure 2 A schematic diagram of the valve plate rotation state of a compensated sealing swing check valve; Figure 3 This is an exploded view of the sealing compensation component in a swing check valve with a compensating seal.

[0017] Figure 4 This is a cross-sectional view of a sealing compensation component in a swing check valve with a compensating seal.

[0018] Attached icon number 1. Valve body; 2. Valve cover; 3. Opening / closing shaft; 4. Valve seat; 5. Sealing compensation assembly; 51. Connecting seat; 511. Slot; 512. Guide groove; 513. Relief groove; 52. Rebound mechanism; 521. Elastic fixing seat; 5211. Annular flap; 522. Inner core; 523. Air bladder; 524. Sealing ring; 6. Valve plate; 61. Inner annular groove. Detailed Implementation

[0019] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application.

[0020] like Figures 1 to 4As shown, this embodiment provides a compensated-seal swing check valve, including a valve body 1, a valve cover 2, an opening / closing shaft 3, a valve seat 4, a sealing compensation assembly 5, and a valve plate 6. A medium flow channel is formed inside the valve body 1, and the valve cover 2 is disposed on the upper part of the valve body 1 and seals the interior of the valve body 1. The opening / closing shaft 3 is disposed inside the valve body 1, and the valve plate 6 is connected to the opening / closing shaft 3, allowing the valve plate 6 to rotate around the opening / closing shaft 3 between an open position and a closed position.

[0021] When the medium flows in the permissible direction, the medium pushes the valve plate 6 to rotate away from the valve seat 4, thus opening the flow channel. When the forward flow weakens, stops, or reverse medium pressure occurs, the valve plate 6 rotates around the opening and closing shaft 3 towards the valve seat 4 and presses against the sealing compensation component 5 provided on the valve seat 4 in the closed position to block the reverse medium flow.

[0022] The valve seat 4 is arranged circumferentially along the flow channel of the valve body 1, and the sealing compensation component 5 is installed on the side of the valve seat 4 facing the valve plate 6. An inner annular groove 61 is provided on the side of the valve plate 6 facing the valve seat 4. The inner annular groove 61 extends circumferentially along the valve plate 6 and corresponds to the position of the sealing compensation component 5. When the valve plate 6 is in the open position, the inner annular groove 61 is separated from the sealing compensation component 5; as the valve plate 6 rotates towards the closed position, the inner annular groove 61 gradually approaches the sealing compensation component 5, and when the valve plate 6 approaches the closed position, it is fitted onto the outer side of the protruding portion of the sealing compensation component 5 facing the valve plate 6.

[0023] As the valve plate 6 continues to move in the closing direction, the inner annular groove 61 compresses the sealing compensation component 5. The inner annular groove 61 serves both to form an annular pressing area that mates with the sealing compensation component 5 and to limit the outer deformation of the sealing compensation component 5 under pressure, ensuring that the main deformation of the sealing compensation component 5 occurs towards the pre-reserved area inside the valve seat 4. After the valve plate 6 reaches the closed position, the inner annular groove 61 and the sealing compensation component 5 form a continuous circumferential pressing relationship, thereby establishing a seal between the valve plate 6 and the valve seat 4.

[0024] like Figure 3 and Figure 4 As shown, the sealing compensation assembly 5 includes a connecting seat 51 and a spring-loaded mechanism 52 disposed on the connecting seat 51. The connecting seat 51 is disposed circumferentially along the valve seat 4 and forms an annular base for mounting and supporting the spring-loaded mechanism 52. A slot 511 is provided on the connecting seat 51, which engages with a corresponding position on the valve seat 4, allowing the sealing compensation assembly 5 to be integrally mounted on the valve seat 4 via the connecting seat 51.

[0025] After adopting the above installation method, the connecting seat 51 and the rebound mechanism 52 can pre-form a complete sealing compensation component 5, which is then installed onto the valve seat 4 as a whole. When the sealing compensation component 5 needs to be repaired or replaced, the snap-fit ​​relationship between the connecting seat 51 and the valve seat 4 can be released, and the sealing compensation component 5 can be removed as a whole, thereby facilitating the inspection and replacement of its internal components.

[0026] Guide grooves 512 are formed on two opposite sides of the connecting seat 51, and both guide grooves 512 extend circumferentially along the connecting seat 51. The spring mechanism 52 includes an elastic fixing seat 521, an inner core 522, an air bladder 523, and a sealing ring 524.

[0027] The elastic fixing seat 521 forms an annular structure along the circumference of the connecting seat 51, and a pressure-bearing part is formed on the side facing the valve plate 6 to cooperate with the inner annular groove 61. Annular petals 5211 are formed on two opposite sides of the elastic fixing seat 521, and the two annular petals 5211 extend toward the guide grooves 512 on both sides of the connecting seat 51, with their free ends entering the corresponding guide grooves 512.

[0028] Therefore, the elastic fixing seat 521 is not a rigid movable ring that can slide axially over a long distance along the connecting seat 51 as a whole, but is held on the connecting seat 51 by two annular petals 5211. The guide groove 512 restricts the position of the corresponding annular petals 5211, and at the same time provides constraints on the elastic movement of the annular petals 5211 as they are compressed by the elastic fixing seat 521.

[0029] When the valve plate 6 presses the elastic fixing seat 521 through the inner annular groove 61, the two annular petals 5211 remain in their respective guide groove 512 areas, while the main body of the elastic fixing seat 521 located between the two annular petals 5211 undergoes elastic deformation toward the interior of the connecting seat 51. In this way, the displacement required for sealing compensation is mainly generated by the deformation of the elastic fixing seat 521 itself, rather than by the repeated sliding between a rigid sealing seat and the fixing seat.

[0030] After prolonged use, the sealing contact position between the valve plate 6 and the valve seat 4 of the swing check valve may change due to wear of the seals, assembly status of components, and long-term operation of the opening and closing mechanism. When the valve plate 6 closes again, the elastic fixed seat 521 can adapt to the pressure applied by the inner annular groove 61 using its own elastic deformation range, so that the sealing contact position has a certain compensation margin, thereby reducing the dependence of the sealing effect on the fit clearance and sliding accuracy of the rigid moving parts.

[0031] An inner core 522 is provided inside the elastic fixing seat 521. The inner core 522 extends circumferentially along the elastic fixing seat 521 and is located between the pressure-bearing part of the elastic fixing seat 521 and the air bag 523. The inner core 522 is wrapped by the elastic fixing seat 521 and does not directly contact the medium in the flow channel during the valve plate 6 closing process.

[0032] When the inner annular groove 61 presses against the elastic fixing seat 521, the force generated by the elastic fixing seat 521 is transmitted to the airbag 523 through the inner core 522. The inner core 522 thus constitutes a force transmission component between the elastic fixing seat 521 and the airbag 523, so that the squeezing force on the elastic fixing seat 521 can be transmitted to the airbag 523 located inside it, while avoiding the airbag 523 being directly in the pressing contact position of the valve plate 6.

[0033] The airbag 523 is located on the side of the inner core 522 facing the connecting seat 51 and extends circumferentially along the sealing compensation assembly 5. The connecting seat 51 is provided with a relief groove 513 at a position corresponding to the airbag 523, and the relief groove 513 is located in the main deformation direction of the airbag 523 after being squeezed by the inner core 522.

[0034] When the valve plate 6 is closed and the elastic retaining seat 521 deforms inward, the inner core 522 transmits pressure to the air bladder 523. Under pressure, the air bladder 523 deforms into the space formed by the relief groove 513. The relief groove 513 provides a defined deformation accommodating area for the air bladder 523, so that the air bladder 523 does not need to bulge disorderly in the mating area where the guide groove 512 and the annular petal 5211 are located.

[0035] Therefore, a sequential action relationship is formed from valve plate 6 to connecting seat 51, that is: The inner ring groove 61 compresses the elastic fixing seat 521, the elastic fixing seat 521 deforms and acts on the inner core 522, the inner core 522 further compresses the airbag 523, and the airbag 523 deforms into the relief groove 513.

[0036] The elastic fixing seat 521 and the air bag 523 together constitute the rebound mechanism 52. After being compressed, the elastic fixing seat 521 stores elastic deformation, and the air bag 523 is compressed at the same time; after the valve plate 6 leaves the valve seat 4, the external pressure is released, and the air bag 523 and the elastic fixing seat 521 recover, so that the elastic fixing seat 521 returns to the state adapted to the next closing action.

[0037] A sealing ring 524 is provided between the two annular petals 5211 and the corresponding guide grooves 512. Specifically, the two sealing rings 524 are respectively provided on two opposite sides of the elastic fixing seat 521 and form a sealing fit with the groove wall of the corresponding guide groove 512, so that the area where the inner core 522 and airbag 523 are located inside the elastic fixing seat 521 is isolated from the flow medium.

[0038] For environments where the conveying medium contains mud, rust, scale, or other particulate impurities, the sealing ring 524 reduces the amount of particles entering the rebound mechanism 52 through the mating point between the annular petal 5211 and the guide groove 512. The airbag 523 and inner core 522 are therefore positioned within the area enclosed by the elastic fixing seat 521, the connecting seat 51, and the sealing rings 524 on both sides, preventing the airbag 523 from being directly eroded by particles in the flow channel medium for extended periods or from continuous friction with impurities entering the interior during repeated compression.

[0039] The sealing ring 524 primarily serves to isolate the medium within the internal area of ​​the rebound mechanism 52, while the main sealing relationship between the sealing compensation component 5 and the valve plate 6 is formed by the annular portion of the elastic fixing seat 521 facing the valve plate 6 and the inner annular groove 61. This allows the valve closing seal and the internal protection of the rebound mechanism to be achieved through different positions.

[0040] When assembling the sealing compensation component 5, the airbag 523 can be first placed in the connecting seat 51 at the position corresponding to the relief groove 513, and then the inner core 522 can be placed on the side of the airbag 523 facing the valve plate 6. After the elastic fixing seat 521 is installed in the connecting seat 51, the two annular petals 5211 respectively enter the guide grooves 512 on both sides of the connecting seat 51, and the sealing ring 524 is placed between the annular petals 5211 and the corresponding guide grooves 512. Thus, the connecting seat 51, the elastic fixing seat 521, the inner core 522, the airbag 523 and the sealing ring 524 are combined to form the rebound mechanism 52 and the sealing compensation component 5, which is then installed onto the valve seat 4 as a whole through the slot 511.

[0041] When the valve is in the open state, the valve plate 6 and the valve seat 4 separate, the inner annular groove 61 no longer compresses the elastic fixing seat 521, and the elastic fixing seat 521 and the air bladder 523 are in the restored state. The two annular petals 5211 remain in the corresponding guide grooves 512, so that the elastic fixing seat 521 is still constrained by the connecting seat 51; the two sealing rings 524 continue to isolate the area where the inner core 522 and the air bladder 523 are located.

[0042] When the valve plate 6 rotates to the closed position, the inner annular groove 61 gradually fits onto the elastic fixing seat 521 along with the valve plate 6. After the two begin to contact, the inner annular groove 61 continues to press against the elastic fixing seat 521, causing the main body between the two annular petals 5211 to elastically deform inward, and compressing the air bladder 523 through the inner core 522. After being compressed, the air bladder 523 deforms into the relief groove 513, thereby jointly forming the elastic stroke required for sealing compensation.

[0043] After the valve plate 6 reaches the closed position, the elastic fixing seat 521 remains pressed against the inner ring groove 61. Since both the elastic fixing seat 521 and the airbag 523 retain corresponding elastic recovery function, when the sealing contact position changes due to long-term use, the rebound mechanism 52 can compensate for the pressing position through its elastic deformation, so that the elastic fixing seat 521 still maintains the sealing contact with the inner ring groove 61.

[0044] Compared to compensation methods that rely on the reciprocating sliding of a rigid movable seat within a guide groove, this embodiment transforms the primary compensation action into the recoverable deformation of the elastic fixed seat 521 and the airbag 523 themselves. The guide groove 512 is mainly used to limit the position of the annular petal 5211 and the deformation range of the elastic fixed seat 521, without serving as a guide rail for the long-stroke reciprocating sliding of the entire sealing seat, thereby reducing the dependence of the compensation effect on the dimensions and surface condition of the rigid sliding fit.

[0045] Meanwhile, the airbag 523 is located inside the elastic fixing seat 521, and the force is transmitted by the inner core 522. The clearance groove 513 provides deformation space for the airbag 523, and the sealing rings 524 on both sides isolate the area where the airbag 523 is located. In this way, a structural isolation is formed between the main component that undertakes the rebound function and the particulate impurities in the flow channel, reducing the possibility of impurities accumulating in the narrow working area and interfering with the operation of the rebound mechanism 52.

[0046] When the valve plate 6 reopens, the inner ring groove 61 leaves the elastic fixing seat 521, and the airbag 523 and the elastic fixing seat 521 release the elastic deformation generated in the closed state. The inner core 522 then returns to the corresponding position, and the sealing compensation assembly 5 re-forms the compensation state for the next closure.

[0047] The connecting seat 51 is connected to the valve seat 4 via the slot 511, which allows the rebound mechanism 52 to be maintained as an independent component while maintaining the overall installation position of the sealing compensation assembly 5. When the elastic fixing seat 521, airbag 523, or sealing ring 524 needs to be inspected or replaced after long-term use, the connecting seat 51 can be removed from the valve seat 4 to perform overall maintenance on the sealing compensation assembly 5 without changing the basic opening and closing structure of the valve body 1, the opening and closing shaft 3, and the valve plate 6.

[0048] In this embodiment, the elastic fixing seat 521, annular petal 5211, inner core 522, air bladder 523, and sealing ring 524 are all adapted to the annular sealing area of ​​the valve seat 4. The elastic fixing seat 521 and sealing ring 524 can be selected from materials with corresponding media resistance and elastic recovery properties according to the conveying medium, working temperature, and working pressure; the connecting seat 51 and inner core 522 can be made of materials that meet the corresponding structural strength and media resistance requirements.

[0049] Through the above structure, the sealing compensation assembly 5 forms a structural system in which the deformation of the elastic fixing seat 521 itself is the main compensation method, the airbag 523 provides auxiliary rebound, the inner core 522 transmits force, the relief groove 513 defines the deformation area of ​​the airbag, the sealing ring 524 isolates the internal rebound area, and the guide groove 512 and the annular petal 5211 maintain the installation and deformation state of the elastic fixing seat 521. When the valve plate 6 is closed, the inner annular groove 61 acts directly on the elastic fixing seat 521 to form a seal and trigger compensation; after the valve plate 6 is opened, the elastic fixing seat 521 and the airbag 523 recover, so that the sealing compensation assembly 5 can repeatedly perform the compensation sealing action.

[0050] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A compensated-seal swing check valve, comprising a valve body (1), a valve cover (2) disposed on the valve body (1), an opening / closing shaft (3), and a valve seat (4) disposed within a flow channel of the valve body (1), characterized in that: The valve seat (4) is provided with a sealing compensation assembly (5). The sealing compensation assembly (5) has a connecting seat (51) and a spring mechanism (52) disposed on the connecting seat (51). The elastic fixing seat (521) of the spring mechanism (52) has two outwardly protruding annular lobes (5211). The connecting seat (51) is provided with guide grooves (512) at positions corresponding to the two annular lobes (5211). The two annular lobes (5211) are respectively embedded in the corresponding guide grooves (512). The groove wall of the groove (512) restricts the movement of the corresponding annular petal (5211) along the pressure direction of the elastic fixing seat (521); an airbag (523) is provided between the elastic fixing seat (521) and the connecting seat (51). When the portion of the elastic fixing seat (521) located between the two annular petals (5211) is compressed, it undergoes elastic deformation toward the airbag (523) and compresses the airbag (523) so that the elastic recovery of the elastic fixing seat (521) and the airbag (523) provides sealing compensation.

2. The compensated-seal swing-check valve according to claim 1, characterized in that: The valve body (1) is provided with a valve plate (6) connected to the opening and closing shaft (3). The valve plate (6) has an inner ring groove (61) on the side facing the sealing compensation component (5). When the valve plate (6) is closed, the inner ring groove (61) presses against the elastic fixing seat (521) and restricts the elastic fixing seat (521) from deforming outward, so that the part of the elastic fixing seat (521) located between the two annular petals (5211) deforms towards the airbag (523).

3. The compensated-seal swing-check valve of claim 2, wherein: The elastic fixing seat (521) encloses the inner core (522), and the airbag (523) is pressed on the side of the inner core (522) facing the connecting seat (51). When the elastic fixing seat (521) is deformed by the inner ring groove (61), it squeezes the inner core (522), and the inner core (522) further squeezes the airbag (523).

4. The compensated-seal swing-check valve according to claim 3, characterized in that: The connecting seat (51) has a relief groove (513) at a position corresponding to the airbag (523). The airbag (523) is annular. After being squeezed by the inner core (522), the airbag (523) extends into the relief groove (513).

5. The compensated-seal swing-check valve according to claim 4, characterized in that: The two annular petals (5211) are respectively provided with a recess opposite to the corresponding guide groove (512), and two sealing rings (524) are respectively provided in the corresponding recess and are sealed with the groove wall of the corresponding guide groove (512) to reduce the entry of impurities in the external medium into the area where the inner core (522) and the airbag (523) are located.

6. The compensated-seal swing-check valve of claim 5, wherein: The connecting seat (51) is provided with a slot (511), which engages with the valve seat (4) to install the sealing compensation component (5) onto the valve seat (4).

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