Gate valve rod assembly

Abstract

The utility model discloses a gate valve rod assembly, belongs to the technical field of valve body parts, and provides a gate valve rod assembly capable of better protecting a sealing ring. The gate valve rod assembly comprises a transmission rod, the lower end of the transmission rod is fixedly connected with a polished shaft, the lower end of the polished shaft is fixedly connected with a rotating disc, and the lower end of the rotating disc is fixedly connected with a leakage-proof shaft; a threaded rod is fixedly connected to the lower end of the leakage-proof shaft, external threads are formed in the outer surface of the threaded rod, the axis of the optical shaft and the axis of the leakage-proof shaft are collinear with the axis of the rotary disc, and the diameter of the optical shaft and the diameter of the leakage-proof shaft are both smaller than the diameter of the rotary disc. The turntable structure is arranged at the matching part of the hand wheel inserting part and the valve plate of the valve rod, and the sealing ring groove is formed below the turntable, so that the configured sealing ring can be shielded and protected by the turntable, the contact between the sealing ring and dust is effectively avoided, the contact friction force between the sealing ring and the valve rod after long-term use is reduced, and the service life of the sealing ring is prolonged. And the valve rod can be kept smooth for a long time.

Description

Technical Field

[0001] The present application relates to the technical field of valve body components, and in particular to a gate valve stem assembly. Background Art

[0002] Gate valves are mostly controlled by valve stems. Since the valve stem extends into the interior of the housing, leakage may occur at the portion where the valve stem and the housing meet. Therefore, a sealing structure is required. Existing valve stems are provided with sealing rings at the transition between the handwheel and the screw. However, there is no additional shielding above the sealing ring on the valve stem. Dust may enter through the gap between the valve stem and the housing and adhere to the sealing ring, thereby affecting the smoothness of the rotation of the valve stem relative to the sealing ring. Summary of the invention

[0003] The purpose of the present application is to provide a gate valve stem assembly that can better protect the sealing ring.

[0004] In order to achieve the above objectives, the present application provides a gate valve stem assembly: comprising a transmission rod, the lower end of the transmission rod is fixedly connected to an optical axis, the lower end of the optical axis is fixedly connected to a turntable, the lower end of the turntable is fixedly connected to an anti-leakage shaft, the lower end of the anti-leakage shaft is fixedly connected to a screw, the outer surface of the screw is provided with an external thread, which is suitable for threaded connection with the valve plate of the gate valve to form a spiral lifting structure.

[0005] As a preference, the axes of the optical axis and the leakage-proof axis are colinear with the axis of the turntable, and the diameters of the optical axis and the leakage-proof axis are both smaller than the diameter of the turntable, so that the turntable has a good anti-slip limiting function.

[0006] Preferably, a coaxial sealing ring groove is formed on the outer side surface of the leakage-proof shaft, and there are several sealing ring grooves, which are arranged along the axis of the leakage-proof shaft, thereby effectively improving the air tightness.

[0007] As a preferred embodiment, the transmission rod is a polygonal column, the axis of the inscribed circle of the polygonal cross-section of the transmission rod is colinear with the axis of the optical axis, the diameter of the optical axis is smaller than the diameter of the inscribed circle of the polygonal cross-section of the transmission rod, and the transmission rod provides a limiting function for the optical axis.

[0008] Preferably, the outer side surface of the transmission rod is a force-bearing surface, and a retaining ring is fixedly connected to the outer side surface of the transmission rod. The upper end surface of the retaining ring is lower than the top surface of the transmission rod, so as to facilitate the insertion of the transmission rod into the handwheel.

[0009] Preferably, the upper end surface of the transmission rod is provided with an inner screw hole extending downward, and the axis of the inner screw hole is colinear with the axis of the inscribed circle of the polygonal cross section of the transmission rod to ensure axial material uniformity.

[0010] As a preference, the axis of the screw is colinear with the axis of the leakage-proof shaft to ensure synchronous rotation.

[0011] As a preference, the end surface of the screw away from the anti-leakage shaft is provided with a coaxial end shaft hole for cooperating with the shaft body at the bottom inner of the gate valve plate to form a sliding pair, thereby further improving the stability of the valve plate when moving up and down.

[0012] Compared with the prior art, the beneficial effects of this application are:

[0013] (1) By setting a turntable structure at the handwheel plug-in part of the valve stem and the matching part of the valve plate, the sealing ring groove is opened below the turntable, so that the configured sealing ring can be shielded and protected by the turntable, effectively avoiding the contact between the sealing ring and dust, thereby reducing the contact friction between the sealing ring and the valve stem after long-term use, and the valve stem can maintain long-term smoothness;

[0014] (2) The limit ring structure provided can cooperate with the gate valve housing to form a rotating pair, which can effectively limit the upward and downward movement of the valve stem, so that the valve stem has good stability during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The first view of the three-dimensional structure of the gate valve stem assembly;

[0016] Figure 2 A second view of the three-dimensional structure of the gate valve stem assembly;

[0017] Figure 3 A first cross-sectional view of the three-dimensional structure of the gate valve stem assembly;

[0018] Figure 4 is a second cross-sectional view of the three-dimensional structure of the gate valve stem assembly;

[0019] Figure 5 For the gate valve stem assembly Figure 4 A partial enlarged view of point A.

[0020] In the figure: 1, transmission rod; 101, force-bearing surface; 102, internal screw hole; 2, retaining ring; 3, optical axis; 4, leak-proof axis; 401, sealing ring groove; 5, turntable; 6, screw; 601, external thread; 602, end shaft hole. DETAILED DESCRIPTION

[0021] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0022] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0023] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0024] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0025] like Figure 1-5 The gate valve stem assembly shown includes a transmission rod 1 that cooperates with a handwheel. The transmission rod 1 is in the shape of a polygonal prism, and a hexagonal prism is usually selected. The outer side surface of the transmission rod 1 is a force-bearing surface 101, which can cooperate with a wrench or a handwheel to connect the torque. The outer side surface of the transmission rod 1 is fixedly connected with a retaining ring 2 for limiting the insertion depth of the handwheel. The upper end surface of the retaining ring 2 is lower than the top surface of the transmission rod 1, giving the handwheel sufficient insertion space. The upper end surface of the transmission rod 1 is provided with an inner screw hole 102 extending downward, which is used to cooperate with the bolt structure on the handwheel to achieve tightening. The axis of the inner screw hole 102 is colinear with the axis of the inscribed circle of the polygonal cross-section of the transmission rod 1, so that the material of the transmission rod 1 will be more evenly distributed in the circumferential direction, and the center of mass is located on the axis.

[0026] The lower end of the transmission rod 1 is fixedly connected with an optical axis 3. The outer surface of the optical axis 3 is smooth and suitable for the housing of the gate valve to form a rotating pair. The axis of the inscribed circle of the polygonal cross section of the transmission rod 1 is colinear with the axis of the optical axis 3. It should be noted that the diameter of the optical axis 3 is smaller than the diameter of the inscribed circle of the polygonal cross section of the transmission rod 1, so that the lower end of the transmission rod 1 can have a certain limiting effect on the optical axis 3. The lower end of the optical axis 3 is fixedly connected with a turntable 5, which can be embedded in the annular groove of the gate valve housing to form a rotating pair, which can limit the up and down movement of the entire valve stem structure. The lower end of the turntable 5 is fixedly connected with a leak-proof shaft 4, which has the function of preventing the inside of the gate valve from leaking. In order to prevent fluid leakage, a coaxial sealing ring groove 401 is provided on the outer side of the leakage-proof shaft 4 for installing a rubber sealing ring. There are several sealing ring grooves 401, which are arranged along the axis of the leakage-proof shaft 4. Correspondingly, the installed rubber sealing rings are also arranged equidistantly and in close contact with the inner wall of the shaft hole of the gate valve housing, thereby producing a good sealing effect. The axes of the optical axis 3 and the leakage-proof shaft 4 are colinear with the axis of the turntable 5 to form an integrated rotating body, which is convenient for cutting and processing. The diameters of the optical axis 3 and the leakage-proof shaft 4 are both smaller than the diameter of the turntable 5, so that the turntable 5 has good upper and lower limit functions.

[0027] The lower end of the leakage-proof shaft 4 is fixedly connected with a screw rod 6 which is in direct contact with the valve plate of the gate valve. The axis of the screw rod 6 is colinear with the axis of the leakage-proof shaft 4 to ensure coaxial rotation. The outer surface of the screw rod 6 is provided with an external thread 601, which is used to be threadedly connected with the valve plate of the gate valve to convert the rotational motion into the lifting motion of the valve plate of the gate valve. The end surface of the screw rod 6 away from the leakage-proof shaft 4 is provided with a coaxial end shaft hole 602, which is plugged into the fixed shaft body at the bottom inner of the gate valve plate, so as to improve the smoothness of the valve plate when moving up and down.

[0028] Working principle: During installation, first match the screw 6 with the valve plate of the gate valve, then put the rubber sealing ring in the sealing ring groove 401 of the leak-proof shaft 4, let the two gate valve shells fit relatively with the turntable 5, and fix the two gate valve shells to form a complete shell, then put the handwheel on the upper end of the transmission rod 1 and tighten it with bolts. When the handwheel is rotated, the entire valve stem will rotate synchronously, but the height relative to the shell will not change. The valve plate of the gate valve can slide relative to the gate valve shell under the action of the matching thread, thereby realizing the opening and closing of the gate valve.

[0029] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A gate valve stem assembly, characterized in that: The invention comprises a transmission rod (1), the lower end of the transmission rod (1) is fixedly connected to an optical axis (3), the lower end of the optical axis (3) is fixedly connected to a rotating disk (5), the lower end of the rotating disk (5) is fixedly connected to a leakage-proof shaft (4), the lower end of the leakage-proof shaft (4) is fixedly connected to a screw rod (6), and the outer surface of the screw rod (6) is provided with an external thread (601) suitable for being threadedly connected to a valve plate of a gate valve.

2. The gate valve stem assembly according to claim 1, characterized in that: The axes of the optical axis (3) and the leakage-proof axis (4) are colinear with the axis of the rotating disk (5), and the diameters of the optical axis (3) and the leakage-proof axis (4) are both smaller than the diameter of the rotating disk (5).

3. The gate valve stem assembly according to claim 2, characterized in that: The outer side surface of the leakage-proof shaft (4) is provided with a coaxial sealing ring groove (401), and there are a plurality of the sealing ring grooves (401), which are arranged along the axis of the leakage-proof shaft (4).

4. The gate valve stem assembly according to claim 3, characterized in that: The transmission rod (1) is in the shape of a polygon, the axis of the inscribed circle of the polygonal cross section of the transmission rod (1) is colinear with the axis of the optical axis (3), and the diameter of the optical axis (3) is smaller than the diameter of the inscribed circle of the polygonal cross section of the transmission rod (1).

5. The gate valve stem assembly according to claim 4, characterized in that: The outer side surface of the transmission rod (1) is a force-bearing surface (101), and a retaining ring (2) is fixedly connected to the outer side surface of the transmission rod (1), wherein the upper end surface of the retaining ring (2) is lower than the top surface of the transmission rod (1).

6. The gate valve stem assembly according to claim 5, characterized in that: The upper end surface of the transmission rod (1) is provided with an inner screw hole (102) extending downward, and the axis of the inner screw hole (102) is colinear with the axis of the inscribed circle of the polygonal cross section of the transmission rod (1).

7. The gate valve stem assembly according to any one of claims 1 to 6, characterized in that: The axis of the screw (6) is colinear with the axis of the leakage-proof shaft (4).

8. The gate valve stem assembly according to claim 7, characterized in that: A coaxial end shaft hole (602) is provided on the end surface of the screw rod (6) away from the leakage-proof shaft (4).

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