CN221922069U - Ball valve capable of reducing switching moment - Google Patents

Abstract

The utility model provides a ball valve for reducing the switching torque, including a valve seat structure, a valve body, and a valve stem. A valve seat guide ring is provided at the valve seat sealing surface of the valve seat structure, a ring groove and an intermediate pressure relief balance hole are provided between the valve seat sealing surface and the valve seat guide ring, the valve body is provided with a valve core, a ball is provided in the valve core, the valve stem is arranged on the valve body and connected with the valve core, the valve seat sealing surface and the valve seat guide ring are not an integral structure, and the ratio of the inner diameter of the valve seat sealing surface to the outer diameter of the static pressure surface of the ball valve is 1:1.1-2. The switching torque can be reduced by 20%.

Description

A ball valve with reduced switching torque

Technical Field

The utility model relates to the technical field of valves, in particular to a ball valve capable of reducing switching torque.

Background Art

A valve is a mechanical device used to control the flow of liquids, gases or other fluids. The valve controls the flow of fluids in and out of the pipeline through a switch mechanism, and is one of the important equipment in various fields. Ball valves are divided into pneumatic ball valves, electric ball valves, and manual ball valves according to the drive mode. In my country, ball valves are widely used in oil refining, long-distance pipelines, chemicals, papermaking, pharmaceuticals, water conservancy, electricity, municipal administration, steel and other industries, and occupy a pivotal position in the national economy. It has a 90-degree rotation action, the plug body is a sphere, and there is a circular through hole or channel passing through its axis. The ball valve is mainly used in the pipeline to cut off, distribute and change the flow direction of the medium. It only needs to rotate 90 degrees and a very small torque to close tightly. The ball valve is most suitable for use as a switch and cut-off valve.

The switching torque of a fixed ball valve is mainly: the friction torque generated between the valve seat and the valve ball, the friction force is generated by the unbalanced force on the valve seat; the friction force of the valve stem packing; the friction torque of the static pressure surface outer diameter acting on the ball bearing. The utility model changes the traditional ball valve seat structure. The traditional ball valve seat is a single sealing surface structure, as shown in Figure 1. The minimum size of the valve seat sealing surface inner diameter D1 is related to the ball structure. It is necessary to ensure that the ball valve can still ensure sufficient contact in the fully open position, and there is a certain margin. The minimum value of the conventional design valve seat sealing surface inner diameter D1 is shown in Figure 2. Based on the characteristics of the above ball valve structure, in order to ensure the seal between the valve seat and the valve ball, the static pressure surface outer diameter D3 needs to be larger than the valve seat sealing surface inner diameter D1 to generate sufficient medium unbalanced force to achieve the sealing effect, and the static pressure surface outer diameter D3 must be larger, so that the static pressure surface outer diameter D3 is too large, resulting in a large friction torque acting on the ball bearing.

Therefore, the utility model provides a ball valve with reduced switching torque, thereby reducing the friction torque of the outer diameter of the static pressure surface acting on the ball bearing.

Utility Model Content

The utility model aims to provide a ball valve which can reduce the switching torque.

In order to achieve the above utility model purpose, the technical solution adopted by the utility model is:

A ball valve for reducing switching torque comprises a valve seat structure, a valve body and a valve stem. A valve seat guide ring is arranged on the valve seat sealing surface of the valve seat structure.

Preferably, an annular groove and an intermediate pressure relief balance hole are provided between the valve seat sealing surface and the valve seat guide ring.

Preferably, the valve body is provided with a valve core, and a ball is provided in the valve core.

Preferably, the valve stem is arranged on the valve body and connected to the valve core.

Preferably, the valve seat sealing surface and the valve seat guide ring are not an integral structure.

Preferably, the ratio of the inner diameter of the valve seat sealing surface to the outer diameter of the static pressure surface of the ball valve is 1:1.1-2.

Further preferably, the ratio of the inner diameter of the valve seat sealing surface to the outer diameter of the static pressure surface of the ball valve is 1:1.2-1.8.

Preferably, when the valve is fully opened, the valve seat sealing surface can completely separate from the ball. At this time, the valve seat guide ring is still in contact with the ball, playing a guiding and supporting role without affecting the opening and closing of the valve.

Preferably, the valve seat sealing surface and the valve seat guide ring have independent functions.

Preferably, the pressure between the valve seat guide ring and the valve seat sealing surface cannot be maintained, so as to ensure that the valve seat can ensure sufficient medium unbalance force to ensure sealing when the valve is in the closed position.

Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

1. The utility model provides a valve seat guide ring at the valve seat sealing surface of the valve seat structure. Due to the addition of the valve seat guide ring, the valve seat sealing surface can be completely separated from the ball when the valve is fully opened. At this time, the valve seat guide ring is still in contact with the valve ball, playing a guiding and supporting role, reducing the switching torque without affecting the switching of the valve.

2. The utility model is provided with an annular groove and an intermediate pressure relief balance hole between the valve seat sealing surface and the valve seat guide ring. The arrangement of this structure ensures that the functions of the valve seat sealing surface and the valve seat guide ring are independent, and the pressure between the valve seat guide ring and the valve seat sealing surface cannot be maintained, thereby ensuring that the valve seat can ensure sufficient medium unbalance force to ensure sealing when the valve is in the closed position.

3. The inner diameter of the valve seat sealing surface can be reduced to completely separate from the spherical surface. Under the condition of ensuring the same valve seat sealing force, the outer diameter of the valve seat static pressure surface can be significantly reduced, the switching torque acting on the valve seat bearing can be effectively reduced, and the total torque can be reduced by 20%.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a sealing surface structure in the prior art;

FIG2 is a schematic diagram of the inner diameter of the sealing surface in the prior art;

FIG3 is a schematic diagram of the structure of Embodiment 1 of the present utility model;

FIG4 is a structural diagram of Embodiment 1 of the present invention;

FIG. 5 is a comparison diagram between Example 1 of the utility model and the prior art.

Among them, 1. valve seat sealing surface, 2. valve seat guide ring, 3. ring groove, 4. intermediate pressure relief balance hole, 5. margin, 6. reduced static pressure imbalance area.

DETAILED DESCRIPTION

In order to more clearly understand the above-mentioned purposes, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner. Therefore, they only show the structures related to the utility model. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other without conflict.

In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

Example 1

As shown in FIG3 , a ball valve for reducing switching torque includes a valve seat structure, a valve body, and a valve stem. A valve seat guide ring is provided at the valve seat sealing surface of the valve seat structure.

Furthermore, an annular groove 3 and an intermediate pressure relief balance hole 4 are provided between the valve seat sealing surface 1 and the valve seat guide ring 2 .

Furthermore, the valve body is provided with a valve core, and a ball is provided in the valve core.

Furthermore, the valve stem is arranged on the valve body and connected to the valve core.

Furthermore, the valve seat sealing surface 1 and the valve seat guide ring 2 are not an integral structure.

Furthermore, the ratio of the inner diameter of the valve seat sealing surface to the outer diameter of the static pressure surface of the ball valve is 1:1.6.

Furthermore, when the valve is fully opened, the valve seat sealing surface 1 can be completely separated from the ball. At this time, the valve seat guide ring 2 is still in contact with the ball, playing a guiding and supporting role without affecting the opening and closing of the valve.

Furthermore, the functions of the valve seat sealing surface 1 and the valve seat guide ring 2 are independent.

Furthermore, the pressure between the valve seat guide ring 2 and the valve seat sealing surface 1 cannot be maintained, so that the valve seat can ensure sufficient medium unbalance force to ensure sealing when the valve is in the closed position.

Specifically, the traditional ball valve seat structure is changed. The traditional ball valve seat is a single sealing surface structure, as shown in Figure 1. The minimum size of the inner diameter D1 of the valve seat sealing surface is related to the ball structure. It is necessary to ensure that the ball valve can still ensure sufficient contact in the fully open position, and there is a certain margin 5. The minimum value of the inner diameter D1 of the conventional design valve seat sealing surface is shown in Figure 2. Based on the characteristics of the above ball valve structure, in order to ensure the seal between the valve seat and the valve ball, the outer diameter D3 of the static pressure surface needs to be larger than the inner diameter D1 of the valve seat sealing surface to generate sufficient medium unbalance force to achieve the sealing effect. The outer diameter D3 of the static pressure surface must be larger, so that the outer diameter D3 of the static pressure surface is too large, resulting in a large friction torque acting on the ball bearing. The difference between this structure and the valve seat structure of the traditional ball valve is that the valve seat seal has a valve seat guide ring, as shown in Figure 3, a valve seat guide ring is added, and the valve seat sealing surface can be completely separated from the ball when the valve is fully opened. At this time, the valve seat guide ring is still in contact with the valve ball, playing the role of guide support, and does not affect the opening and closing of the valve. There is a ring groove 3 and an intermediate pressure relief balance hole 4 between the valve seat sealing surface and the valve seat guide ring. The setting of this structure ensures that the functions of the valve seat sealing surface 1 and the valve seat guide ring 2 are independent. The pressure between the valve seat guide ring 2 and the valve seat sealing surface 1 cannot be maintained, ensuring that the valve seat can ensure sufficient medium unbalance force to ensure sealing when the valve is in the closed position. The inner diameter of the valve seat sealing surface can be reduced to completely separate from the spherical surface, so the outer diameter of the valve seat static pressure surface can be significantly reduced while ensuring the same valve seat sealing force. From Figure 5 (the figure on the right is the prior art, and the figure on the left is the figure of the embodiment of the utility model), it can be seen that the reduced static pressure unbalance area 6 in the figure can effectively reduce the switching torque acting on the valve seat bearing, and the total torque can be reduced by 20%.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, 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 directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to the above embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the above embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. A ball valve for reducing switching torque, characterized in that: The invention comprises a valve seat structure, a valve body and a valve stem. A valve seat guide ring is arranged on the valve seat sealing surface of the valve seat structure. 2. A ball valve for reducing switching torque as described in claim 1, characterized in that an annular groove and an intermediate pressure relief balance hole are provided between the valve seat sealing surface and the valve seat guide ring. 3. A ball valve for reducing switching torque as claimed in claim 1, characterized in that the valve body is provided with a valve core, and a ball is provided in the valve core. 4. A ball valve for reducing switching torque as described in claim 3, characterized in that the valve stem is arranged on the valve body and connected to the valve core. 5. A ball valve for reducing switching torque as claimed in claim 1, characterized in that the valve seat sealing surface and the valve seat guide ring are not an integral structure. 6. A ball valve for reducing switching torque as claimed in claim 1, characterized in that the ratio of the inner diameter of the valve seat sealing surface to the outer diameter of the static pressure surface of the ball valve is 1:1.1-2.