Limiting structure of ball valve

Abstract

The invention relates to the technical field of ball valves, in particular to a limiting structure of a ball valve, which comprises a basic valve assembly, a microswitch assembly, a handle, a rotating shaft assembly and an upper shell assembly, the basic valve assembly is provided with a connecting shaft which is clamped with a valve core, and the connecting shaft is arranged on a valve body of the basic valve assembly by using a connecting cover plate; the rotating shaft assembly penetrates through the upper shell assembly and the microswitch assembly to be connected with the connecting shaft in a clamped mode, the handle is installed on the rotating shaft assembly, the upper shell assembly is located between the handle and the microswitch assembly, a counter bore is formed in the connecting cover plate, a limiting pin in the vertical direction is arranged in the counter bore, a limiting groove is formed in a shaft shoulder of the connecting shaft, and the shaft shoulder of the connecting shaft is installed in the counter bore. The limiting surfaces at the two ends of the limiting groove abut against the limiting pin for limiting, the strength of the limiting structure is greatly improved, the situation that the limiting structure is damaged due to the fact that the force for pulling the handle is too large is effectively prevented, and the reliability of the ball valve is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ball valves, and in particular to a limiting structure of a ball valve. Background Art

[0002] As an important component of the air circuit system of rail transit vehicles, the ball valve plays a role in controlling the on-off of the air source in the air circuit system. The ball valve has rotation direction and rotation angle restrictions during operation. If the rotation direction and rotation angle are wrong, the ball valve will malfunction. Therefore, a handle rotation limit structure is set at the handle of the ball valve to ensure the correct operation of the ball valve. The basic structure of the existing ball valve is as follows: Figure 1 As shown, it includes a basic valve assembly 1, a micro switch assembly 2, a handle 3, a rotating shaft assembly 4 and an upper shell assembly 5. The basic valve body assembly is provided with a connecting shaft and a valve core clamped together. The connecting shaft is installed on the valve body of the basic valve assembly 1 using a connecting cover plate. The rotating shaft assembly 4 passes through the upper shell assembly 5 and the micro switch assembly 2 and is clamped together with the connecting shaft. The handle 3 is installed on the rotating shaft assembly 4. The upper shell assembly 5 is located between the handle 3 and the micro switch assembly 2. The handle 3 is rotated to drive the rotating shaft assembly 4 to drive the valve core to rotate to realize the opening and closing of the ball valve. During rotation, the limiting pin on the upper shell assembly 5 and the limiting groove on the handle 3 are used to realize the limiting. However, since the upper shell assembly 5 is usually a plastic part, the limiting structure strength is relatively low. If the user operates improperly during use, such as pulling the handle 3 with too much force, the upper shell assembly 5 may be damaged. Summary of the Invention

[0003] In order to solve the problems mentioned in the above background technology, the present invention provides a limiting structure for a ball valve.

[0004] The present invention discloses the following technical scheme: a limiting structure of a ball valve, comprising a basic valve assembly, a microswitch assembly, a handle, a rotating shaft assembly and an upper shell assembly, wherein the basic valve body assembly is provided with a connecting shaft that is clamped with the valve core, and the connecting shaft is installed on the valve body of the basic valve assembly using a connecting cover plate, the rotating shaft assembly passes through the upper shell assembly and the microswitch assembly and is clamped with the connecting shaft, the handle is installed on the rotating shaft assembly, and the upper shell assembly is located between the handle and the microswitch assembly, a countersunk hole is provided on the connecting cover plate, a vertical limiting pin is provided in the countersunk hole, a limiting groove is provided on the shoulder of the connecting shaft, the shoulder of the connecting shaft is installed in the countersunk hole, and the limiting surfaces at both ends of the limiting groove abut against the limiting pin for limiting.

[0005] Furthermore, the limit pin is a cylinder, the limit pin is embedded in the connecting cover plate and the connecting cover plate is fixedly installed.

[0006] Furthermore, a protrusion is provided at the lower end of the connecting shaft to engage with a groove on the valve core.

[0007] Furthermore, the connecting cover plate is mounted on the valve body by screws.

[0008] Furthermore, the handle is mounted on the shaft assembly via a nut and a gasket.

[0009] Beneficial effect: Compared with the prior art, the limiting structure of the present invention is provided with a limiting pin on the connecting cover plate of the ball valve, and a limiting groove is provided on the connecting shaft. The limiting surfaces at both ends of the limiting groove abut against the limiting pin to limit the connecting shaft. The limiting structure is very strong, which effectively prevents the limiting structure from being damaged by excessive force when the handle is pulled, thereby improving the reliability of the ball valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the ball valve structure in the prior art; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the connection cover plate of the present invention; Figure 4 Schematic diagram of the limiting shaft of the present invention; Figure 5 for Figure 2 AA cross-sectional view; In the figure: 1-basic valve assembly, 2-micro switch assembly, 3-handle, 4-rotating shaft assembly, 5-upper housing assembly, 6-connecting shaft, 7-valve core, 8-connecting cover plate, 9-limit pin, 10-limit slot, DETAILED DESCRIPTION

[0011] like Figures 2 to 5 As shown, a limit structure of a ball valve includes a basic valve assembly 1, a micro switch assembly 2, a handle 3, a rotating shaft assembly 4 and an upper housing assembly 5. The basic valve body assembly is provided with a connecting shaft 6 that is clamped with the valve core 7. The lower end of the connecting shaft 6 is provided with a protrusion that is clamped with the groove on the valve core 7 to ensure that the valve core 7 and the limit shaft rotate synchronously. The connecting shaft 6 is installed on the valve body of the basic valve assembly 1 using a connecting cover plate 8. The rotating shaft assembly 4 passes through the upper housing assembly 5, the micro switch assembly 2 is clamped with the connecting shaft 6, and the handle 3 is installed on the rotating shaft. On the shaft assembly 4, the upper shell assembly 5 is located between the handle 3 and the micro switch assembly 2. A countersunk hole is provided on the connecting cover plate 8, and a vertical limit pin 9 is provided in the countersunk hole. The limit pin 9 is a cylinder. The limit pin 9 is embedded in the connecting cover plate 8 and the connecting cover plate 8 is fixedly installed, so that the limit pin 9 is installed stably and reliably. A limit groove 10 is provided on the shoulder of the connecting shaft 6, and the shoulder of the connecting shaft 6 is installed in the countersunk hole. When the connecting shaft 6 rotates a certain angle, the limit surfaces at both ends of the limit groove 10 abut against the limit pin 9 for limiting.

[0012] The connecting cover plate 8 is mounted on the valve body by screws, which is convenient for installation. The handle 3 is mounted on the rotating shaft assembly 4 by nuts and washers, which is convenient for installation of the handle 3.

[0013] Structural principle: The connecting cover plate 8 is fixedly installed on the valve body, and the two ends of the connecting shaft 6 are respectively clamped with the valve core 7 and the rotating shaft assembly 4. The connecting shaft 6 can be rotatably installed on the valve body. The connecting cover plate 8 is provided with a countersunk hole, and a vertical limit pin 9 is provided in the countersunk hole. A limit groove 10 is provided on the shoulder of the connecting shaft 6, and the shoulder of the connecting shaft 6 is installed in the countersunk hole. The handle 3 drives the rotating shaft assembly 4 to rotate and then drives the connecting shaft 6 to rotate. Usually, the rotation angle range of the connecting shaft 6 is 90° to realize the on and off of the ball valve. When the connecting shaft 6 is rotated into place, the limit surfaces at both ends of the limit groove 10 abut against the limit pin 9 to limit the connecting shaft 6. Due to the high structural strength of the connecting cover plate 8, the connecting shaft 6 and the limit pin 9, the limit structure is not easily damaged and can withstand a greater rotation force at the handle 3, thereby effectively improving the reliability of the limit structure.

[0014] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A ball valve limit structure, comprising a basic valve assembly (1), a micro switch assembly (2), a handle (3), a rotating shaft assembly (4) and an upper housing assembly (5), wherein the basic valve body assembly is provided with a connecting shaft (6) and a valve core (7) for clamping, the connecting shaft (6) is mounted on the valve body of the basic valve assembly (1) using a connecting cover plate (8), the rotating shaft assembly (4) passes through the upper housing assembly (5), the micro switch assembly (2) and the connecting shaft (6) for clamping, the handle (3) is mounted on the rotating shaft assembly (4), and the upper housing assembly (5) is located between the handle (3) and the micro switch assembly (2), characterized in that: The connecting cover plate (8) is provided with a countersunk hole, a vertical limit pin (9) is provided in the countersunk hole, a limit groove (10) is provided on the shaft shoulder of the connecting shaft (6), the shaft shoulder of the connecting shaft (6) is installed in the countersunk hole, and the limit surfaces at both ends of the limit groove (10) abut against the limit pin (9) for limiting.

2. The ball valve limiting structure according to claim 1, characterized in that: The limiting pin (9) is a cylinder, and the limiting pin (9) is embedded in the connecting cover plate (8), and the connecting cover plate (8) is fixedly installed.

3. The ball valve limiting structure according to claim 1, characterized in that: The lower end of the connecting shaft (6) is provided with a protrusion which engages with a groove on the valve core (7).

4. The ball valve limiting structure according to claim 1, characterized in that: The connecting cover plate (8) is mounted on the valve body by screws.

5. The ball valve limiting structure according to claim 1, characterized in that: The handle (3) is mounted on the rotating shaft assembly (4) via a nut and a washer.

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