Buffer device of valve rod

Abstract

The utility model discloses a buffering device of a valve rod, and relates to the field of valves. One end of the lower valve rod penetrates through the valve cover and the sealing layer and extends into the guide sleeve; the connecting shaft is detachably connected to the end, away from the guide sleeve, of the lower valve rod. The two ends of the first elastic piece are connected to the abutting table and the end, deviating from the lower valve rod, of the connecting shaft correspondingly. One end of the upper valve rod penetrates through the support to be connected to the abutting table. One end of the shaft sleeve is slidably connected to the outer wall of the upper valve rod, and the other end is detachably connected to the connecting shaft; the two ends of the second elastic piece are connected to the end, away from the first elastic piece, of the abutting table and the top wall of the shaft sleeve correspondingly; the outer walls of the first elastic piece and the second elastic piece abut against the inner side wall of the shaft sleeve. When the lower valve rod is heated to generate linear expansion, the first elastic piece absorbs displacement generated by thermal expansion. When the valve is opened or closed, the first elastic piece and the second elastic piece play a buffering role, and the impact force generated when the valve clack makes contact with the upper sealing face or the lower sealing face is absorbed and dispersed.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a buffer device for a valve stem. Background Art

[0002] As the core transmission component of the valve opening and closing action, the valve stem's structural design and reliability have a crucial impact on the valve's sealing performance, service life, and stability of the entire system. Traditional valve stem design usually adopts an integrated rigid structure, which controls the contact or separation between the valve disc and the valve seat sealing surface through axial movement, thereby realizing the valve's opening and closing function.

[0003] However, at the moment the valve is closed, the high-speed collision between the valve disc and the valve seat sealing surface will generate a huge instantaneous impact load. Since the traditional rigid valve stem lacks an effective impact energy absorption mechanism, this impact will cause cumulative damage such as microcracks and plastic deformation on the sealing surface, thereby shortening the sealing life of the valve.

[0004] In addition, when the temperature of the medium inside the valve rises, the valve stem will elongate due to thermal expansion, causing the valve disc to impact the valve seat sealing surface, thereby damaging the valve seat sealing surface. Utility Model Content

[0005] The embodiments of the present application solve the technical problems existing in the background technology by providing a buffer device for a valve stem.

[0006] The embodiment of the present application provides a valve stem buffer device comprising a connecting shaft, a first elastic member, a second elastic member, a sleeve and an abutment platform; one end of the lower valve stem passes through the valve cover and the sealing layer, extends into the guide sleeve, and is connected to the valve disc; the connecting shaft is detachably connected to the end of the lower valve stem away from the guide sleeve; the two ends of the first elastic member are respectively connected to the abutment platform and the end of the connecting shaft away from the lower valve stem; one end of the upper valve stem passes through the bracket and is connected to the abutment platform; one end of the sleeve is slidably connected to the outer wall of the upper valve stem, and the other end of the sleeve is detachably connected to the connecting shaft; the second elastic member is sleeved on the upper valve stem, and its two ends are respectively connected to the end of the abutment platform away from the first elastic member and the top wall of the sleeve; the outer walls of the first elastic member and the second elastic member both abut the inner side wall of the sleeve; the outer wall of the upper valve stem is sleeved with a guide plate, and the guide plate is used to prevent the upper valve stem from rotating.

[0007] In a possible implementation, the buffer device of the valve stem also includes two first gaskets and two second gaskets; the two first gaskets are respectively arranged at one end of the connecting shaft away from the lower valve stem and one end of the abutment platform away from the second elastic member; the first elastic member is arranged between the two first gaskets; one of the second gaskets is fixedly connected to the top wall of the sleeve and is located on the outside of the upper valve stem; the other second gasket is sleeved on the outer wall of the upper valve stem and fixedly connected to one end of the abutment platform away from the first elastic member; the second elastic member is arranged between the two second gaskets.

[0008] In a possible implementation, the buffer device of the valve stem further includes a limit assembly; the limit assembly is disposed between the shaft sleeve and the upper valve stem, and is configured to prevent the shaft sleeve from being offset when moving.

[0009] In a possible implementation, the first elastic member and the second elastic member are both disc springs.

[0010] In a possible implementation, an internal threaded hole is provided on a side of the lower valve stem away from the guide sleeve; and an external thread corresponding to the internal threaded hole is provided on an end of the connecting shaft away from the first elastic member.

[0011] In a possible implementation, the buffer device of the valve stem also includes a fastener; a first connecting hole is provided on the outer wall of the lower valve stem; the first connecting hole is connected to the internal threaded hole; a second connecting hole corresponding to the first connecting hole is provided on the outer wall of the connecting shaft away from the first elastic member; one end of the fastener passes through the first connecting hole and extends into the second connecting hole.

[0012] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects:

[0013] The buffer device of the valve stem provided in the embodiment of the present application includes a connecting shaft, a first elastic member, a second elastic member, a sleeve and an abutment platform. At the moment when the valve is closed, when the valve disc contacts the lower sealing surface, the first elastic member can exert its buffering effect, effectively reducing the impact force of the valve disc on the lower sealing surface; correspondingly, at the moment when the valve is opened, when the valve disc contacts the upper sealing surface, the second elastic member plays a key buffering role, reducing the impact of the valve disc on the upper sealing surface. In addition, when the temperature of the medium inside the valve rises and the lower valve stem undergoes linear expansion due to heat, the first elastic member will be moderately compressed. This mechanism effectively absorbs the displacement caused by thermal expansion, thereby avoiding damage to the valve disc and the upper or lower sealing surface due to excessive stress, and also prevents the lower valve stem from being stuck due to limited expansion. Such a design not only improves the operational stability of the valve, but also enhances its durability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 A schematic diagram of the structure of a buffer device for a valve stem provided in an embodiment of the present application;

[0016] Figure 2 for Figure 1 A magnified view of point A.

[0017] Icon: 1-connecting shaft; 2-first elastic member; 3-second elastic member; 4-sleeve; 5-abutment platform; 6-first gasket; 7-lower valve stem; 8-valve cover; 9-sealing layer; 10-guide sleeve; 11-bracket; 12-guide plate; 13-upper valve stem; 14-upper sealing surface; 15-lower sealing surface; 16-second gasket. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0020] The present application embodiment provides a valve stem buffer device, such as Figure 1 to Figure 2 As shown, the buffer device of the valve stem includes a connecting shaft 1, a first elastic member 2, a second elastic member 3, a sleeve 4 and an abutment platform 5. One end of the lower valve stem 7 passes through the valve cover 8 and the sealing layer 9, and extends into the guide sleeve 10, and is connected to the valve disc. The connecting shaft 1 is detachably connected to the end of the lower valve stem 7 away from the guide sleeve 10. The two ends of the first elastic member 2 are respectively connected to the abutment platform 5 and the end of the connecting shaft 1 away from the lower valve stem 7. One end of the upper valve stem 13 passes through the bracket 11 and is connected to the abutment platform 5. The diameter of the abutment platform 5 is greater than the diameter of the upper valve stem 13. One end of the sleeve 4 is slidably connected to the outer wall of the upper valve stem 13, and the other end thereof is detachably connected to the connecting shaft 1, which is convenient for replacement and maintenance. Specifically, the diameter of the connecting shaft 1 is greater than the diameter of the lower valve stem 7, and the sleeve 4 is connected to the connecting shaft 1 by screws, and the sleeve 4 is equal to the diameter of the connecting shaft 1. The second elastic member 3 is sleeved on the upper valve stem 13, and its two ends are respectively connected to the end of the abutment platform 5 away from the first elastic member 2 and the top wall of the sleeve 4. The outer walls of the first elastic member 2 and the second elastic member 3 are both abutted against the inner wall of the sleeve 4. The outer wall of the upper valve stem 13 is sleeved with a guide plate 12, which is used to prevent the upper valve stem 13 from rotating.

[0021] Specifically, the two ends of the guide sleeve 10 are respectively provided with an upper sealing surface 14 and a lower sealing surface 15. When the valve is closed, the valve disc abuts against the lower sealing surface 15; when the valve is opened, the valve disc abuts against the upper sealing surface 14.

[0022] It should be noted that at the moment the valve is closed, when the valve disc contacts the lower sealing surface 15, the first elastic member 2 can exert its buffering effect, effectively reducing the impact of the valve disc on the lower sealing surface 15; correspondingly, at the moment the valve is opened, when the valve disc contacts the upper sealing surface 14, the second elastic member 3 plays a key buffering role, reducing the impact of the valve disc on the upper sealing surface 14. In addition, when the temperature of the medium inside the valve rises and the lower valve stem 7 expands linearly due to heat, the first elastic member 2 will be moderately compressed. This mechanism effectively absorbs the displacement caused by thermal expansion, thereby avoiding damage to the valve disc and the upper sealing surface 14 or the lower sealing surface 15 due to excessive stress, and also prevents the lower valve stem 7 from getting stuck due to limited expansion. Such a design not only improves the operational stability of the valve, but also enhances its durability and reliability.

[0023] In the embodiment of the present application, the buffer device of the valve stem also includes two first gaskets 6 and two second gaskets 16. The two first gaskets 6 are respectively arranged at one end of the connecting shaft 1 away from the lower valve stem 7 and one end of the abutment platform 5 away from the second elastic member 3. The first elastic member 2 is arranged between the two first gaskets 6. One of the second gaskets 16 is fixedly connected to the top wall of the sleeve 4 and is located on the outer side of the upper valve stem 13. The movement of the sleeve 4 drives one of the second gaskets 16 to move synchronously. The other second gasket 16 is sleeved on the outer wall of the upper valve stem 13 and is fixedly connected to one end of the abutment platform 5 away from the first elastic member 2. The second elastic member 3 is arranged between the two second gaskets 16.

[0024] It should be noted that the first gasket 6 and the second gasket 16 provide a stable supporting surface for the first elastic member 2 and the second elastic member 3 .

[0025] In the embodiment of the present application, the buffer device of the valve stem further comprises a limit assembly, which is arranged between the shaft sleeve 4 and the upper valve stem 13 and is configured to prevent the shaft sleeve 4 from deflecting when moving.

[0026] Specifically, the limiting assembly includes a groove and a boss. The groove is provided on the upper valve stem 13, and the boss is provided on the inner wall of the sleeve 4. When the sleeve 4 slides along the upper valve stem 13, a tight fit is formed between the groove and the boss. This design can effectively limit the deviation of the sleeve 4 and ensure its stability and accuracy during movement.

[0027] In the embodiment of the present application, the first elastic member 2 and the second elastic member 3 are both disc springs.

[0028] It should be noted that the disc spring has excellent elastic force compensation characteristics, which can effectively absorb and disperse the impact energy during valve stem movement, significantly reducing the impact force of the valve disc on the upper sealing surface 14 or the lower sealing surface 15, thereby protecting the upper sealing surface 14 or the lower sealing surface 15 from damage.

[0029] In the embodiment of the present application, an internal threaded hole is provided on the side of the lower valve stem 7 away from the guide sleeve 10. An external thread corresponding to the internal threaded hole is provided on the end of the connecting shaft 1 away from the first elastic member 2.

[0030] In the embodiment of the present application, the buffer device of the valve stem further comprises a fastener. A first connecting hole is provided on the outer wall of the lower valve stem 7. The first connecting hole is connected to the internal threaded hole. A second connecting hole corresponding to the first connecting hole is provided on the outer wall of the connecting shaft 1 away from the first elastic member 2. One end of the fastener passes through the first connecting hole and extends into the second connecting hole.

[0031] It should be noted that the present application closely connects the connecting shaft 1 and the lower valve stem 7 together through the cooperation of the internal thread hole and the external thread. Then, a fastener is used to pass through the first connecting hole and extend into the second connecting hole to further strengthen the connection structure.

[0032] Specifically, the fastener is a conical pin.

[0033] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0034] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A valve stem buffer device, characterized in that: It comprises a connecting shaft (1), a first elastic member (2), a second elastic member (3), a shaft sleeve (4) and an abutment platform (5); One end of the lower valve stem (7) passes through the valve cover (8) and the sealing layer (9), extends into the guide sleeve (10), and is connected to the valve disc; The connecting shaft (1) is detachably connected to an end of the lower valve stem (7) away from the guide sleeve (10); Two ends of the first elastic member (2) are respectively connected to the abutment platform (5) and an end of the connecting shaft (1) facing away from the lower valve stem (7); One end of the upper valve stem (13) passes through the bracket (11) and is connected to the abutment platform (5); One end of the shaft sleeve (4) is slidably connected to the outer wall of the upper valve stem (13), and the other end of the shaft sleeve (4) is detachably connected to the connecting shaft (1); The second elastic member (3) is sleeved on the upper valve stem (13), and its two ends are respectively connected to an end of the abutment platform (5) away from the first elastic member (2) and the top wall of the shaft sleeve (4); The outer walls of the first elastic member (2) and the second elastic member (3) are both in contact with the inner wall of the shaft sleeve (4); The outer wall of the upper valve stem (13) is sleeved with a guide plate (12), and the guide plate (12) is used to prevent the upper valve stem (13) from rotating.

2. The valve stem buffer device according to claim 1, characterized in that: It also includes two first gaskets (6) and two second gaskets (16); The two first gaskets (6) are respectively arranged at one end of the connecting shaft (1) away from the lower valve stem (7) and one end of the abutment platform (5) away from the second elastic member (3); The first elastic member (2) is arranged between the two first gaskets (6); One of the second gaskets (16) is fixedly connected to the top wall of the shaft sleeve (4) and is located outside the upper valve stem (13); the other second gasket (16) is sleeved on the outer wall of the upper valve stem (13) and is fixedly connected to an end of the abutment platform (5) away from the first elastic member (2); The second elastic member (3) is arranged between the two second gaskets (16).

3. The valve stem buffer device according to claim 1, characterized in that: Also includes a limiter assembly; The limiting assembly is arranged between the shaft sleeve (4) and the upper valve stem (13), and is configured to prevent the shaft sleeve (4) from being offset when moving.

4. The valve stem buffer device according to claim 1, characterized in that: The first elastic member (2) and the second elastic member (3) are both disc springs.

5. The valve stem buffer device according to claim 1, characterized in that: An internal threaded hole is provided on a side of the lower valve stem (7) away from the guide sleeve (10); An end of the connecting shaft (1) away from the first elastic member (2) is provided with an external thread corresponding to the internal thread hole.

6. The valve stem buffer device according to claim 5, characterized in that: Also included are fasteners; The outer wall of the lower valve stem (7) is provided with a first connecting hole; The first connecting hole is in communication with the internal threaded hole; An outer wall of the connecting shaft (1) on a side away from the first elastic member (2) is provided with a second connecting hole corresponding to the first connecting hole; One end of the fastener passes through the first connecting hole and extends into the second connecting hole.

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