Built-in shaft pin type clamping structure of power station flat gate valve

Abstract

The utility model relates to the technical field of flat gate valves, in particular to a built-in shaft pin type clamping structure of a power station flat gate valve, which comprises a valve rod, a flashboard frame is arranged at the lower end of the valve rod, a flashboard mounting area is formed in the flashboard frame, and a first flashboard and a second flashboard are arranged in the flashboard mounting area. The first gate plate and the second gate plate are arranged at the two ends of the gate plate frame respectively, a first limiting groove which is inwards sunken along the side wall of the first gate plate is formed in the upper end of the first gate plate, a second limiting groove which is inwards sunken along the side wall of the second gate plate is formed in the upper end of the second gate plate, and a first limiting pin shaft is arranged in the first limiting groove; a first limiting pin shaft is arranged in the first limiting groove, a second limiting pin shaft is arranged in the second limiting groove, the bottom of the first limiting pin shaft is fixed to the first gate plate, the bottom of the second limiting pin shaft is fixed to the second gate plate, and the top of the first limiting pin shaft and the top of the second limiting pin shaft are fixed to the gate plate frame.

Description

Technical Field

[0001] This utility model relates to the field of flat gate valve technology, and in particular to a built-in shaft pin clamping structure for a power plant flat gate valve. Background Technology

[0002] In high-pressure fluid control systems such as power plants, flat gate valves are key opening and closing devices, and the reliability of their clamping structure directly affects the valve's sealing performance and service life.

[0003] Currently, Chinese patent CN202708144U discloses a flat gate valve, including a valve body, a gate, a valve stem, a valve seat, a valve cover, and a handwheel. The upper end of the valve body is fixedly connected to the valve cover, the upper end of the gate is connected to the valve stem, and the upper end of the valve stem is connected to the handwheel. There are valve seats on the left and right sides of the gate that fit tightly against it. The valve seats are provided with springs, O-rings, RPTFE inserts, and rubber sealing rings. The springs and O-rings are located at the contact points between the valve seats and the valve body, and the RPTFE inserts and rubber sealing rings are located at the contact points between the valve seats and the gate. This gate valve structure successfully achieves low-pressure sealing at the inlet and high-pressure sealing at the outlet with low specific pressure, long service life, and ensures strong sealing performance.

[0004] However, the patent has insufficient sealing performance, and the rigid connection in the structure lacks adaptive adjustment capability. When the temperature changes or the medium pressure fluctuates, gaps are easily generated between the gate and the valve seat, leading to medium leakage.

[0005] Therefore, there is an urgent need for a clamping structure specifically designed for the inside of gate valves to overcome the limitations of traditional technologies. The built-in shaft pin clamping structure proposed in this invention achieves dynamic constraint and adaptive sealing of the gate through the synergistic effect of the limiting pin and the elastic element, providing an innovative solution to the above problems. Utility Model Content

[0006] In view of the above situation and to overcome the defects of the prior art, the purpose of this utility model is to provide a built-in shaft pin clamping structure for a power station flat gate valve. The above technical objective is achieved through the following technical solution:

[0007] An internal pivot pin clamping structure for a power plant flat gate valve includes:

[0008] A valve stem is provided with a gate frame at its lower end. The gate frame has a gate mounting area inside, and a first gate and a second gate are provided inside the gate mounting area. The first gate and the second gate are respectively located at both ends of the gate frame. The upper end of the first gate has a first limiting groove recessed inward along the side wall of the first gate, and the upper end of the second gate has a second limiting groove recessed inward along the side wall of the second gate. A first limiting pin is provided inside the first limiting groove, and a second limiting pin is provided inside the second limiting groove. The bottom of the first limiting pin is fixed to the first gate, and the bottom of the second limiting pin is fixed to the second gate. The tops of the first and second limiting pins are fixed to the gate frame. The first limiting pin and the inner wall of the first limiting groove form a fitting clearance, and the second limiting pin and the inner wall of the second limiting groove also form a fitting clearance.

[0009] Furthermore, a first spring groove is provided on the side wall of the first gate facing the second gate, and a second spring groove is provided on the side wall of the second gate facing the first gate. A cylindrical spring is provided between the first spring groove and the second spring groove, and the two ends of the cylindrical spring are respectively pressed and fixed to the inner walls of the first gate and the second gate.

[0010] Furthermore, the lower end of the valve stem extends into the top of the gate frame, and a mounting hole is provided on the side wall at the connection position between the valve stem and the gate frame, with a pin penetrating through the two in the mounting hole.

[0011] In summary, this utility model has the following beneficial effects:

[0012] ① High sealing performance: The continuous pressure of the cylindrical spring ensures tight contact between the gate and the valve seat, and the double gate design significantly reduces media leakage;

[0013] ② Anti-jamming design: The setting of the limit pin can effectively prevent the gate from rotating or falling off. At the same time, the fit clearance with the groove allows the gate to self-adjust. The left and right gaps are adjusted in conjunction with the first gate and the second gate to ensure automatic sealing with the valve seat. Attached Figure Description

[0014] The accompanying drawings, which are provided to further illustrate the present invention and form part of this application, do not constitute an undue limitation of the present invention. In the drawings:

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

[0016] In the diagram, 1 is the valve stem; 2 is the gate frame; 3 is the first gate; 4 is the second gate; 5 is the first limiting groove; 6 is the second limiting groove; 7 is the first limiting pin; 8 is the second limiting pin; 9 is the first spring groove; 10 is the second spring groove; 11 is the cylindrical spring; and 12 is the pin. Detailed Implementation

[0017] The foregoing and other technical contents, features and effects of this utility model are described in conjunction with the appendix below. Figure 1 The detailed description of the embodiments will make this clear. All structural details mentioned in the following embodiments are based on the accompanying drawings.

[0018] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings.

[0019] Example 1: A built-in pivot pin clamping structure for a power plant flat gate valve, comprising:

[0020] A valve stem 1 has a gate frame 2 at its lower end. The valve stem 1 transmits operating force to the gate frame 2 to drive the gate to move, thereby controlling the opening and closing of the valve. The lower end of the valve stem 1 extends into the top of the gate frame 2. A mounting hole is provided on the side wall at the connection position between the valve stem 1 and the gate frame 2. A pin 12 passes through the two parts in the mounting hole. The connection between the valve stem 1 and the gate frame 2 is achieved by the pin 12 being closed in the bottom space of the valve stem 1. After the lower end of the valve stem 1 is screwed tight, the pin is closed in the mounting hole. The pin 12 passes through and fixes the valve stem 1, which enhances the connection strength between the two parts and prevents loosening or falling off under high-frequency operation, thus achieving a stable connection between the gate and the valve stem 1.

[0021] The gate frame 2 has a gate mounting area inside, and a first gate 3 and a second gate 4 are set inside the gate mounting area. The first gate 3 and the second gate 4 are respectively set at both ends of the gate frame 2. The upper end of the first gate 3 is provided with a first limiting groove 5 that is recessed inward along the side wall of the first gate 3. The upper end of the second gate 4 is provided with a second limiting groove 6 that is recessed inward along the side wall of the second gate 4. The first limiting groove 5 is provided with a first limiting pin 7, and the second limiting groove 6 is provided with a second limiting pin 8. The bottom of the first limiting pin 7 is fixed to the first gate 3, the bottom of the second limiting pin 8 is fixed to the second gate 4, and the tops of the first limiting pin 7 and the second limiting pin 8 are fixed to the gate frame 2. The first limiting pin 7 and the second limiting pin 8 are both built-in, which can effectively prevent the gate from loosening and rotating. The two ends of the pins are respectively connected to the gate frame 2 and the outer circle of the gate, forming a rigid constraint so that the gate cannot rotate.

[0022] The first limiting pin 7 and the inner wall of the first limiting groove 5 form a fitting clearance, and the second limiting pin 8 and the inner wall of the second limiting groove 6 also form a fitting clearance. The fitting clearance between the pin and the inner wall of the limiting groove allows the gate to be adjusted slightly within a certain range, ensuring that the first limiting pin 7 and the second limiting pin 8 can move left and right, and cooperate with the first gate 3 and the second gate 4 to adjust the left and right clearance, ensuring automatic sealing with the valve seat.

[0023] A first spring groove 9 is provided on the side wall of the first gate plate 3 facing the second gate plate 4, and a second spring groove 10 is provided on the side wall of the second gate plate 4 facing the first gate plate 3. A cylindrical spring 11 is provided between the first spring groove 9 and the second spring groove 10, and the two ends of the cylindrical spring 11 are respectively abutted and fixed to the inner walls of the first gate plate 3 and the second gate plate 4.

[0024] The cylindrical spring 11 is disposed between the first gate 3 and the second gate 4, thereby providing bidirectional elastic pressure to ensure that the first gate 3 and the second gate 4 can fit tightly against the valve seat when the gate is closed, thereby enhancing the sealing performance. At the same time, the cylindrical spring 11 can also buffer the impact force during the opening and closing of the valve and reduce component wear.

[0025] The above description is a further detailed explanation of the present utility model in conjunction with specific embodiments, and it should not be considered that the specific implementation of the present utility model is limited to this. For those skilled in the art to which the present utility model pertains and related fields, any extensions, operation methods, and data substitutions made based on the technical solution concept of the present utility model should fall within the protection scope of the present utility model.

Claims

1. A built-in pivot pin clamping structure for a power plant flat gate valve, characterized in that, include: A valve stem (1) is provided with a gate frame (2) at its lower end. The gate frame (2) forms a gate mounting area inside. A first gate (3) and a second gate (4) are provided inside the gate mounting area. The first gate (3) and the second gate (4) are respectively located at both ends of the gate frame (2). The upper end of the first gate (3) is provided with a first limiting groove (5) that is recessed inward along the side wall of the first gate (3). The upper end of the second gate (4) is provided with a second limiting groove (6) that is recessed inward along the side wall of the second gate (4). The first limiting groove (5) is provided with a first limiting groove (6) that is recessed inward along the side wall of the second gate (4). The groove (5) is provided with a first limiting pin (7), and the second limiting groove (6) is provided with a second limiting pin (8). The bottom of the first limiting pin (7) is fixed to the first gate plate (3), and the bottom of the second limiting pin (8) is fixed to the second gate plate (4). The tops of the first limiting pin (7) and the second limiting pin (8) are fixed to the gate plate frame (2). The first limiting pin (7) and the inner wall of the first limiting groove (5) form a fitting gap, and the second limiting pin (8) and the inner wall of the second limiting groove (6) also form a fitting gap.

2. The built-in pivot pin clamping structure for a power plant flat gate valve according to claim 1, characterized in that: A first spring groove (9) is provided on the side wall of the first gate (3) facing the second gate (4), and a second spring groove (10) is provided on the side wall of the second gate (4) facing the first gate (3). A cylindrical spring (11) is provided between the first spring groove (9) and the second spring groove (10), and the two ends of the cylindrical spring (11) are respectively abutted and fixed to the inner walls of the first gate (3) and the second gate (4).

3. The built-in pivot pin clamping structure for a power plant flat gate valve according to claim 2, characterized in that: The lower end of the valve stem (1) extends into the top of the gate frame (2). A mounting hole is provided at the side wall where the valve stem (1) connects to the gate frame (2). A pin (12) is provided in the mounting hole to pass through both.

Images