High-strength hard-seal ball valve

Abstract

A high-strength hard sealing ball valve, including valve body, valve ball body arranged in the valve body cavity, valve stem fixedly connected with the valve ball body, and drive shaft threaded in the valve stem, and upper sealing seat rotationally connected with the shaft wall of the drive shaft, the utility model discloses a main flow channel, auxiliary flow channel and linkage cutting mechanism composed of sealing piston and push rod are arranged in the input end of the valve body and communicated with the input channel, and the operation is mechanically linked with the rotation opening and closing operation of the valve stem, the self-adapting enhancement of sealing force is realized by the creative use of the system itself medium pressure, when closing, the rotation of the drive shaft pulls the push rod through the connecting rod mechanism, the piston opens, the medium can enter the valve ball body flow channel, the pressure on both sides of the valve ball is balanced, the bidirectional sealing effect is formed, the higher the system pressure is, the greater the pressing force on the valve ball sealing pair is, thereby the defect that the traditional hard sealing ball valve is prone to leakage due to insufficient sealing force after high pressure or sealing surface wear is effectively overcome.

Description

Technical Field

[0001] This utility model relates to the technical field of sealing ball valves, specifically to a high-strength hard-seal ball valve. Background Technology

[0002] Hard-seal ball valves are widely used in metallurgical, chemical, and petroleum industries due to their high temperature resistance and wear resistance. Traditional hard-seal ball valves mainly rely on pre-tightening springs or medium pressure (one-way sealing) to press the valve seat against the ball to achieve a seal. However, under extremely high pressure or after long-term use causing wear on the sealing surface, this sealing force may be insufficient, easily leading to leakage. Especially at the moment of opening and closing, the sealing surface is easily eroded by the fluid, affecting the valve's lifespan.

[0003] In the existing technology, although there are various sealing enhancement solutions, most of them have complex structures, high actual application costs, or require an external power source, resulting in high cost and low reliability. Therefore, there is an urgent need for a high-strength sealing solution that can actively and adaptively enhance sealing force, and has a compact structure and simple operation. Utility Model Content

[0004] The purpose of this invention is to provide a high-strength hard-seal ball valve to solve the problems mentioned in the background art.

[0005] The technical solution adopted to solve the above technical problems is:

[0006] A high-strength hard-seal ball valve includes a valve body, a valve ball disposed within a valve body cavity, a valve stem fixedly connected to the valve ball, and a drive shaft fixedly connected to the valve stem. It also includes an input channel disposed at the input end of the valve body. One side of the input channel is connected to a main flow channel, and a sealing piston is slidably disposed inside the main flow channel. An auxiliary flow channel is connected to the outer wall of the main flow channel near the sealing piston. The other end of the auxiliary flow channel communicates with a fluid channel disposed within the valve ball. The movement of the sealing piston enables the connection and blockage of the main flow channel and the auxiliary flow channel.

[0007] As a preferred technical solution of this utility model, the sealing piston is located at a far end away from the main flow channel. One end of the sealing piston is connected to a push rod, which is slidably connected inside the main flow channel. Pushing the push rod can push the sealing piston to slide along the inner wall of the main flow channel. When it slides to cover the connection between the main flow channel and the auxiliary flow channel, the fluid is blocked.

[0008] As a preferred embodiment of this utility model, the other end of the push rod is rotatably connected to a first connecting plate, the other end of the first connecting plate is rotatably connected to a second connecting plate, and the other end of the second connecting plate is connected to a drive shaft. The drive shaft can drive the first connecting plate and the second connecting plate to push the push rod to move radially along the inside of the main channel.

[0009] As a preferred embodiment of this utility model, the sealing piston is connected to a tapered sealing plug at one end near the auxiliary flow channel, and a matching tapered ring seat is provided at the opposite end of the sealing plug. The tapered ring seat is connected inside the main flow channel to enhance the sealing performance.

[0010] As a preferred technical solution of this utility model, in the closed state of the drive shaft, the sealing plug is separated from the conical ring seat. At this time, the main flow channel and the auxiliary flow channel are connected, and the fluid is transported to the fluid channel through the main flow channel and the auxiliary flow channel to achieve bidirectional sealing. The opposite is true in the open state.

[0011] As a preferred embodiment of this utility model, it further includes an upper sealing seat rotatably connected to the drive shaft wall. The upper sealing seat is fixedly installed on the top of the valve body, the valve stem is rotatably installed inside the valve body, and a handle is fixedly connected to the upper end of the drive shaft.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1. This utility model, by setting a main flow channel and an auxiliary flow channel connected to the input channel at the valve body input end, and a linkage cut-off mechanism composed of a sealing piston and a push rod, and making its action mechanically linked with the rotational opening and closing operation of the valve stem through a first connecting plate and a second connecting plate, creatively utilizes the system's own medium pressure to achieve adaptive enhancement of sealing force. When the valve is in the closed state, the rotation of the drive shaft pulls the push rod through the linkage mechanism, causing the sealing piston to open. The medium can enter the valve ball flow channel through the main flow channel and the auxiliary flow channel, balancing the pressure on both sides of the valve ball and forming a bidirectional sealing effect. The higher the system pressure, the greater the clamping force acting on the valve ball sealing pair, thereby effectively overcoming the defects of traditional hard-seal ball valves that are prone to leakage due to insufficient sealing force under high pressure or after the sealing surface is worn, and significantly improving the sealing reliability and service life of the valve under high pressure conditions.

[0014] 2. The sealing enhancement mechanism of this utility model is entirely controlled by mechanical linkage through the valve stem drive shaft, without the need for an external power source or a complex control system. It has a compact structure, low cost, and high reliability. This linkage design ensures the precise timing of the sealing piston's action during valve opening and closing: when closing, the auxiliary flow channel is opened first to balance the pressure; when opening, the flow channel is blocked first to relieve pressure. This process of "relieving pressure before opening" and "closing before pressurizing" effectively avoids the direct erosion of the sealing surface by the high-speed medium at the moment of opening and closing, greatly reducing the risk of wear on the sealing pair. The entire device operates no differently from an ordinary ball valve, which is simple and intuitive, yet achieves an active and adaptive sealing effect. It is particularly suitable for high-pressure and harsh working conditions in metallurgy, chemical industry, and other fields. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a side view of the structure of this utility model;

[0017] Figure 3 for Figure 2 A partial diagram of the exploded structure;

[0018] Figure 4 This is a schematic diagram of the main cross-sectional structure of this utility model.

[0019] In the diagram: 1. Valve body; 2. Valve ball; 3. Valve stem; 4. Upper sealing seat; 5. Handle; 6. Main flow channel; 7. Auxiliary flow channel; 8. Push rod; 81. Sealing piston; 9. First connecting plate; 10. Second connecting plate; 11. Input channel; 12. Sealing plug; 13. Conical ring seat. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0025] Example 1

[0026] exist Figures 1-4 This utility model provides a technical solution: a high-strength hard-seal ball valve. The device includes a valve body 1, a valve ball 2 disposed within the cavity of the valve body 1, a valve stem 3 fixedly connected to the valve ball 2, and a drive shaft fixedly connected to the valve stem 3, and an upper sealing seat 4 rotatably connected to the drive shaft wall. The upper sealing seat 4 is fixedly installed on the top of the valve body 1 for sealing during drive shaft rotation. The valve stem 3 is rotatably installed inside the valve body 1. A handle 5 is fixedly connected to the upper end of the drive shaft, or the drive shaft can be controlled to rotate by a transmission device, such as a motor. For manual operation, the handle 5 needs to be rotated to control the drive shaft and valve ball 2 to rotate back and forth 90°, thereby controlling the opening and closing of the valve ball 2 relative to the internal channel of the valve body 1. It also includes an input channel 11 disposed at the input end of the valve body 1, with a main channel connected to one side of the input channel 11. 6. It is connected to the input channel 11. A sealing piston 81 is slidably installed inside the main channel 6. An auxiliary flow channel 7 is connected to the outer wall of the main channel 6 near the sealing piston 81. The other end of the auxiliary flow channel 7 is connected to the fluid channel inside the valve ball 2. When the valve ball 2 is closed, the fluid flows into the main channel 6 and the auxiliary flow channel 7 through the input channel 11 and enters the fluid channel inside the valve ball 2. This cancels out the pressure on both sides of the sealing surface of the valve ball 2, making full use of the system's own pressure to form a bidirectional sealing force. The higher the pressure, the tighter the seal. It is especially suitable for high-pressure conditions. Even if the sealing pair wears after long-term use, the auxiliary system can automatically compensate to maintain the sealing effect and extend the service life of the valve. The movement of the sealing piston 81 realizes the connection and blockage inside the main channel 6 and the auxiliary flow channel 7.

[0027] In one aspect of this embodiment, the sealing piston 81 is specifically located at a distance from the main flow channel 6. One end of the sealing piston 81 is connected to a push rod 8, which is slidably connected inside the main flow channel 6. Pushing the push rod 8 can push the sealing piston 81 to slide along the inner wall of the main flow channel 6. When it slides to cover the connection between the main flow channel 6 and the auxiliary flow channel 7, the fluid is blocked.

[0028] The other end of the push rod 8 is rotatably connected to a first connecting plate 9, and the other end of the first connecting plate 9 is rotatably connected to a second connecting plate 10. The other end of the second connecting plate 10 is connected to a drive shaft. The drive shaft can drive the first connecting plate 9 and the second connecting plate 10 to push the push rod 8 to move radially along the interior of the main channel 6. (Refer to...) Figure 3 and Figure 4As shown, the valve is currently in the closed state. While relatively closed, the drive shaft will drive the first connecting plate 9 and the second connecting plate 10 to pull the push rod 8 to move radially along the inside of the main flow channel 6, thereby controlling the sealing piston 81 to disengage from the input end of the auxiliary flow channel 7, so that the fluid can smoothly enter the fluid channel inside the valve ball 2. The opening and closing of the auxiliary seal and the opening and closing of the ball valve are completed by the same valve stem, without the need for additional operation or external power. The structure is compact, the operation is reliable, and misoperation is avoided.

[0029] Meanwhile, regarding the sealing surface of the protective valve ball 2: through precise linkage timing control, "depressurization before opening" and "closure before pressurization" are achieved, effectively avoiding high-speed erosion of the sealing surface by the medium.

[0030] In one aspect of this embodiment, the sealing performance of the sealing piston 81 is further improved by connecting a tapered sealing plug 12 to one end of the sealing piston 81 near the auxiliary flow channel 7. The opposite end of the sealing plug 12 is provided with a matching tapered ring seat 13, which is connected inside the main flow channel 6. The sealing performance of the contact surface is enhanced by the matching sealing plug 12 and tapered ring seat 13.

[0031] In one aspect of this embodiment, when the drive shaft is closed, the sealing plug 12 is separated from the conical ring seat 13. At this time, the main flow channel 6 and the auxiliary flow channel 7 are connected, and the fluid is transported to the fluid channel through the main flow channel 6 and the auxiliary flow channel 7 to achieve bidirectional sealing. In the open state, the opposite is true, and the sealing plug 12 and the conical ring seat 13 are controlled to be in close contact with each other to ensure the transport of the medium in the fluid channel in the open state.

[0032] The specific operating principle of the high-strength hard-seal ball valve of this utility model is as follows: When the valve needs to be closed, the operator rotates the handle 5 counterclockwise, driving the drive shaft to rotate. The drive shaft, through its fixed connection with the valve stem 3, drives the valve stem 3 and the valve ball 2 to rotate approximately 90 degrees, causing the fluid channel of the valve ball 2 to be misaligned with the flow channel of the valve body 1, thus cutting off the main channel. At the same time, the rotation of the drive shaft will cause the second connecting plate 10 connected to its end to swing. The second connecting plate 10 pushes the push rod 8 to move inward along the main flow channel 6 through the first connecting plate 9. The push rod 8 pushes the sealing piston 81 at its front end to slide away from the auxiliary flow channel 7, causing the sealing plug 12 at the front end of the sealing piston 81 to separate from the conical ring seat 13 in the main flow channel 6. At this time, the medium from the input channel 11 can simultaneously enter the main flow channel 6 and flow into the fluid channel of the valve ball 2, which is in the closed state, through the connected auxiliary flow channel 7, thereby cutting off the main channel. A pressure balance is established on both sides. The system utilizes the pressure of the medium itself to form a bidirectional sealing force on both sides of the sealing pair. The higher the pressure, the stronger the sealing effect, realizing adaptive enhancement of the sealing force. When the valve needs to be opened, the handle 5 is rotated clockwise, and the drive shaft drives the valve ball 2 to rotate and open the main channel. In conjunction, the drive shaft pulls the push rod 8 and the sealing piston 81 to move in the opposite direction through the second connecting plate 10 and the first connecting plate 9, so that the sealing plug 12 is tightly embedded in the conical ring seat 13, blocking the connection between the main channel 6 and the auxiliary flow channel 7. This action is completed before the valve ball 2 is opened, cutting off the auxiliary pressure source to the flow channel of the valve ball 2, and avoiding high-speed erosion of the sealing surface by the high-pressure medium at the moment it is about to open. The entire opening and closing process is operated by a single drive shaft, realizing precise mechanical linkage between the opening and closing of the main channel and the auxiliary pressure balance control, ensuring the safe operation sequence of "depressurizing before opening" and "closing before pressurizing".

[0033] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A high-strength hard-seal ball valve, comprising a valve body (1), a valve ball (2) disposed within the cavity of the valve body (1), a valve stem (3) fixedly connected to the valve ball (2), and a drive shaft fixedly connected to the valve stem (3), characterized in that: It also includes an input channel (11) located at the input end of the valve body (1). One side of the input channel (11) is connected to a main channel (6). A sealing piston (81) is slidably disposed inside the main channel (6). An auxiliary flow channel (7) is connected to the outer wall of the main channel (6) near the sealing piston (81). The other end of the auxiliary flow channel (7) is connected to a fluid channel disposed inside the valve ball (2). The movement of the sealing piston (81) realizes the connection and blockage of the main channel (6) and the auxiliary flow channel (7).

2. The high-strength hard-seal ball valve according to claim 1, characterized in that: The sealing piston (81) is located at a distance from the main channel (6). One end of the sealing piston (81) is connected to a push rod (8). The push rod (8) is slidably connected inside the main channel (6). Pushing the push rod (8) can push the sealing piston (81) to slide along the inner wall of the main channel (6). When it slides to cover the connection between the main channel (6) and the auxiliary channel (7), the fluid is blocked.

3. A high-strength hard-seal ball valve according to claim 2, characterized in that: The other end of the push rod (8) is rotatably connected to a first connecting plate (9), and the other end of the first connecting plate (9) is rotatably connected to a second connecting plate (10). The other end of the second connecting plate (10) is connected to a drive shaft. The drive shaft can drive the first connecting plate (9) and the second connecting plate (10) to push the push rod (8) to move radially along the inside of the main channel (6).

4. A high-strength hard-seal ball valve according to claim 1, characterized in that: The sealing piston (81) is connected to a tapered sealing plug (12) at one end near the auxiliary flow channel (7). The opposite end of the sealing plug (12) is provided with a matching tapered ring seat (13). The tapered ring seat (13) is connected inside the main flow channel (6) to enhance the sealing performance.

5. A high-strength hard-seal ball valve according to claim 1, characterized in that: When the drive shaft is closed, the sealing plug (12) is separated from the conical ring seat (13). At this time, the main flow channel (6) and the auxiliary flow channel (7) are connected. The fluid is transported to the fluid channel through the main flow channel (6) and the auxiliary flow channel (7) to achieve bidirectional sealing. The opposite is true when the drive shaft is open.

6. A high-strength hard-seal ball valve according to claim 1, characterized in that: It also includes an upper sealing seat (4) that is rotatably connected to the drive shaft wall. The upper sealing seat (4) is fixedly installed on the top of the valve body (1). The valve stem (3) is rotatably installed inside the valve body (1). A handle (5) is fixedly connected to the upper end of the drive shaft.

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