Valve shaft connecting structure of large-caliber hydroelectric ball valve

Abstract

A valve shaft connecting structure of a large-caliber hydroelectric ball valve comprises a valve body, a driving shaft and a valve, the driving shaft is installed on the valve body in the radial direction, and the driving shaft in the valve body is detachably connected with the valve through a blind flange. A driving shaft key groove is formed in a driving shaft blind flange of the driving shaft; flat keys are installed in the valve key groove and the driving shaft key groove. By the adoption of the scheme, the technical effects of convenient disassembly, accurate alignment, stable torque transmission and connection rigidity and stability enhancement are achieved, and the performance and practicability of the hydroelectric ball valve are remarkably improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a valve shaft connection structure of a large-caliber hydroelectric ball valve. Background Art

[0002] In the field of large-diameter hydropower ball valves used in conjunction with turbine engines in hydropower stations, current technology faces a series of challenges and limitations. Specifically, these challenges are mainly reflected in the following aspects:

[0003] 1. Valve size and weight issues:

[0004] The ball valves used in hydropower stations are mostly large-diameter valves, with diameters generally exceeding 1000mm, and operating pressures often reaching 3.0MPa or above. These large diameters and high pressures directly lead to the valves being bulky and heavy, which in turn increases the size of the valve's internal components, causing significant inconvenience in valve manufacturing, transportation, and installation.

[0005] 2. Excessive torque during closing:

[0006] Due to the high flow rate of liquid in large-diameter hydroelectric ball valves, the valves are subjected to strong water flow impact during the closing process, generating huge torque. Relying solely on specialized bolts to cope with this torque is limited in effectiveness, expensive to implement, and uneconomical, making it difficult to meet actual application requirements.

[0007] 3. Defects in the connection between the drive shaft and the valve:

[0008] Traditionally, the connection between a valve's drive shaft and valve is typically achieved through an axial key connection and flange fixing. This structure requires machining a shaft hole and keyway along the valve's axial direction. However, due to the valve's unique shape and large size, machining errors are highly likely to occur, making it difficult to ensure machining accuracy. Such machining errors can lead to serious accidents such as assembly failure and valve damage during assembly or operation, severely impacting valve reliability and service life.

[0009] In summary, the existing technology has many deficiencies in the valve shaft connection structure of large-diameter hydroelectric ball valves. There is an urgent need for a novel, reliable and economical connection method to overcome the above defects and improve the overall performance and service life of the valve. Utility Model Content

[0010] In view of the problems existing in the prior art, the utility model provides a valve shaft connection structure of a large-diameter hydroelectric ball valve, which reduces the processing difficulty and improves the transmission torque.

[0011] The utility model is implemented as follows: a valve shaft connection structure of a large-diameter hydroelectric ball valve comprises a valve body, a drive shaft and a valve, wherein the drive shaft is radially mounted on the valve body, and the drive shaft is detachably connected to the valve through a blind flange in the valve body, and is characterized in that a valve keyway is provided on the end face of the valve blind flange of the valve in a radial direction, and a drive shaft keyway is provided on the drive shaft blind flange of the drive shaft; and flat keys are installed in the valve keyway and the drive shaft keyway.

[0012] Further preferably, a positioning screw hole is provided at the center of the drive shaft keyway, and a positioning bolt is installed in the positioning screw hole.

[0013] Further preferably, a pre-installed screw hole is provided at the center of the valve keyway, and a penetrating pre-installed stepped hole is provided at the center of the flat key corresponding to the position of the pre-installed screw hole.

[0014] Further preferably, leveling screw holes are symmetrically provided on both sides of the prefabricated screw hole, and leveling bolts are installed in the leveling screw holes.

[0015] Further preferably, saddle pins are provided on the outer circumferential mating surfaces of the valve blind flange and the drive shaft blind flange.

[0016] The utility model offers the following advantages and technical effects: It proposes a valve shaft connection structure for a large-diameter hydroelectric ball valve, significantly improving its performance and practicality. Based on the valve body, drive shaft, and valve, this structure ensures proper valve operation and accurate fluid control. The drive shaft is radially mounted to the valve body, providing stable power for the valve's opening and closing, enhancing the valve's stability and reliability.

[0017] The blind flange allows for a removable connection between the drive shaft and valve, facilitating maintenance, overhaul, and component replacement, improving the valve's maintainability and flexibility. Keyways are designed into the blind flange end faces of the valve and drive shaft, and they are tightly connected via a flat key, enabling efficient torque transmission and precise alignment.

[0018] To further improve the precision and stability of the connection, this utility model introduces positioning screw holes and positioning bolts, providing precise positioning points for the drive shaft and the flat key, reducing failures caused by improper installation. In addition, the design of pre-installed screw holes and pre-installed stepped holes allows the flat key to be pre-fixed in the valve keyway before installation, improving installation convenience and accuracy.

[0019] The introduction of leveling screw holes and leveling bolts allows for fine-tuning of the flat key, eliminating minor unevenness caused by machining or installation errors, ensuring a tight and stable connection and improving the valve's sealing performance and operational stability. Finally, the saddle pin design provides an additional fixing point for the valve and drive shaft connection, enhancing the rigidity and stability of the connection, preventing loosening or falling off, and improving the safety and reliability of the valve.

[0020] To sum up, the detachable valve shaft connection structure of the hydroelectric ball valve of the utility model significantly improves the performance and practicality of the hydroelectric ball valve through ingenious design and multiple optimization measures, and makes important contributions to the application and development of the hydroelectric ball valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the drive shaft and valve installation structure;

[0023] Figure 3 yes Figure 2 Middle AA section view;

[0024] Figure 4 yes Figure 3 Enlarged view of middle part I;

[0025] Figure 5 yes Figure 2 Middle BB cross-section;

[0026] Figure 6 This is a schematic diagram of the three-dimensional structure of the drive shaft and the valve;

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the valve;

[0028] Figure 8 It is a schematic diagram of the three-dimensional structure of the drive shaft.

[0029] In the figure, 1. valve body; 2. drive shaft; 2-1. drive shaft blind flange; 2-2. drive shaft keyway; 2-3. positioning screw hole; 2-4. positioning bolt; 3. valve; 3-1. valve blind flange method; 3-2. valve keyway; 3-3. pre-installed screw hole; 3-4. leveling screw hole; 4. flat key; 4-1. pre-installed stepped hole; 4-2. pre-installed bolt; 5. leveling bolt; 6. saddle pin. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] See also Figures 1 to 8, a valve shaft connection structure of a large-diameter hydroelectric ball valve, including a valve body 1, a drive shaft 2 and a valve 3, constitutes the basic structure of the hydroelectric ball valve, ensuring that the valve can work normally and realize fluid control; the drive shaft is radially installed on the valve body, so that the drive shaft can be stably fixed on the valve body, providing a stable power transmission path for the opening and closing of the valve, and enhancing the stability and reliability of the valve; the drive shaft is detachably connected to the valve in the valve body through a blind plate flange, realizing convenient connection and disassembly between the valve and the drive shaft, facilitating the maintenance, inspection and replacement of parts of the valve, and improving the maintainability and flexibility of the valve; a valve keyway 3-2 is provided on the end face of the valve blind plate flange 3-1 of the valve in a radial direction, and a drive shaft keyway 2-2 is provided on the drive shaft blind plate flange 2-1 of the drive shaft; a flat key 4 is installed in the valve keyway and the drive shaft keyway, and the valve and the drive shaft are tightly connected together through the flat key to realize effective transmission of torque.

[0032] Further preferably, a positioning screw hole 2-3 is provided at the center of the drive shaft keyway, into which a positioning bolt 2-4 is installed. The design of the positioning screw hole and the positioning bolt provides a precise positioning point between the drive shaft and the flat key, ensuring that the flat key can be accurately aligned with the drive shaft keyway during installation, thereby improving the accuracy and stability of the connection and reducing failures caused by improper installation.

[0033] Further preferably, a pre-installed screw hole 3-3 is provided in the center of the valve keyway, and a pre-installed stepped hole 4-1 is provided through the center of the flat key corresponding to the position of the pre-installed screw hole. A pre-installed bolt 4-2 is installed in the pre-fabricated stepped hole. The design of the pre-installed screw hole and the pre-installed stepped hole allows the flat key to be pre-fixed in the valve keyway with a bolt before installation, ensuring that the flat key will not slip or shift during installation, thereby improving installation convenience and accuracy.

[0034] Further preferably, leveling screw holes 3-4 are symmetrically provided on both sides of the prefabricated screw hole, and leveling bolts 5 are installed in the leveling screw holes. The design of the leveling screw holes and leveling bolts allows for fine-tuning of the flat key during installation to eliminate minor unevenness caused by machining or installation errors, ensuring a tighter and smoother connection between the valve and the drive shaft, and improving the sealing performance and operational stability of the valve.

[0035] Further preferably, a saddle pin 6 is provided on the outer circumferential mating surface of the valve blind flange and the drive shaft blind flange. The design of the saddle pin provides an additional fixing point for the connection between the valve blind flange and the drive shaft blind flange, enhances the rigidity and stability of the connection, prevents the connection from loosening or falling off due to vibration or external force during use, and improves the safety and reliability of the valve.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A valve shaft connection structure for a large-caliber hydroelectric ball valve, comprising a valve body, a drive shaft, and a valve. The drive shaft is radially mounted on the valve body and is detachably connected to the valve via a blind flange within the valve body. The structure is characterized by: A valve keyway is provided on the end face of the valve blind flange of the valve in the radial direction, and a drive shaft keyway is provided on the drive shaft blind flange of the drive shaft; flat keys are installed in the valve keyway and the drive shaft keyway.

2. The valve shaft connection structure of the large-diameter hydroelectric ball valve according to claim 1 is characterized in that: A positioning screw hole is provided at the center of the driving shaft keyway, and a positioning bolt is installed in the positioning screw hole.

3. The valve shaft connection structure of the large-diameter hydroelectric ball valve according to claim 1 is characterized in that: A pre-installed screw hole is provided at the center of the valve keyway, and a penetrating pre-installed stepped hole is provided at the center of the flat key corresponding to the position of the pre-installed screw hole.

4. The valve shaft connection structure of the large-diameter hydroelectric ball valve according to claim 3 is characterized by: Leveling screw holes are symmetrically arranged on both sides of the prefabricated screw hole, and leveling bolts are installed in the leveling screw holes.

5. The valve shaft connection structure of the large-diameter hydroelectric ball valve according to claim 3 is characterized in that: The outer circumferential matching surfaces of the valve blind flange and the drive shaft blind flange are provided with saddle pins.

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