Novel fixed ball valve driving chain matching structure

Abstract

The utility model relates to the technical field of valves, in particular to a novel fixed ball valve driving chain matching structure. Comprising a square key, a valve rod, a cylindrical pin and a ball. A square key groove is formed in the side face of the upper portion of the valve rod, a direction indicating groove is formed in the top face, and four semicircular cylindrical pin grooves are evenly distributed in the side face of the bottom of the valve rod. A cylindrical pit is formed in the ball body, and four semicircular cylindrical pin pits are evenly distributed in the side wall of the cylindrical pit. The square key is fixed in a square key groove of the valve rod through an assembly pin, the bottom of the valve rod is inserted into a cylindrical pit formed in the ball body, and cylindrical pins are inserted into four semicircular cylindrical pin pits in the ball body and matched with four semicircular cylindrical pin grooves in the valve rod, so that power transmission of the driving chain from the square key to the ball body is completed. The device has the beneficial effects that the driving chain structure is optimized, and the influence on the ball strength is reduced; the centering property and the guidance quality of the valve rod are greatly improved; the square keys improve the strength of the driving keys, the number of the driving keys can be reduced, and assembly convenience is enhanced; and the square key improves the limiting precision and reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field especially relates to a novel fixed ball valve drive chain cooperation structure. BACKGROUND

[0002] For the common small-bore, high-pressure ball valve on the pipeline of chemical industry, the strength of its drive chain usually faces great challenge:

[0003] ①The cooperation structure of common ball and valve stem is flat square or square, which leads to larger gap between valve stem and ball, larger dead zone of valve stem, and larger impact force on ball when valve stem is opened and closed.

[0004] ②The stress of square connection mode is only on four corners, stress is concentrated, bearing capacity is low, and the centering and guiding properties are poor. INVENTION CONTENTS

[0005] The utility model discloses a kind of novel fixed ball valve drive chain cooperation structures, to effectively solve the problem raised in background art.

[0006] To achieve the above object, the utility model takes the following technical scheme: a kind of novel fixed ball valve drive chain cooperation structure, including square key, valve stem, cylindrical pin, ball;The upper side of the valve stem is equipped with square key groove, top surface is equipped with direction indicating groove, the bottom side of the valve stem is provided with four semicircle cylindrical pin grooves evenly;The ball is equipped with cylindrical pit, and four semicircle cylindrical pin pits are evenly distributed on the side wall of cylindrical pit.

[0007] Preferably, the square key is fixed in the square key groove of the valve stem by assembly pin, the valve stem bottom is inserted and mounted in the cylindrical pit provided on the ball, and the cylindrical pin is inserted and mounted in the four semicircle cylindrical pin pits on the ball, which cooperates with the four semicircle cylindrical pin grooves on the valve stem to complete the power transmission of the drive chain from the square key to the ball.

[0008] When the drive chain works, the valve stem acts as a rotating drive shaft, and the force applied by the outside acts on the valve stem and the side edge of the square key, so that the valve stem obtains a rotatable force, and then the force is evenly distributed on the cylindrical pin through the pin hole at the bottom of the valve stem and transmitted to the ball, thereby driving the ball to rotate. When the square key rotates to the specified state, the ball can complete the corresponding action, and the state of the middle passage of the ball can be judged according to the direction indicating groove at the end of the valve stem. Limiting grooves are arranged on the connecting disc of the valve, and the square key can cooperate with the limiting grooves to limit.

[0009] The utility model has the advantages of:

[0010] 1. The ball and valve stem are fitted with cylindrical pins. While maintaining the same design strength, compared to a square connection, using cylindrical pins results in a smaller opening size at the ball-stem connection point, thus reducing the impact of the opening on the ball's strength. This connection structure distributes stress evenly across the outer surfaces of each cylindrical pin, avoiding stress concentration and allowing for greater torque transmission. It also significantly improves the centering and guiding properties of the valve stem.

[0011] 2. The valve stem drive key is upgraded to a square key, and the fit strength is improved. Under the same torque, the number of drive keys can be reduced, which enhances the ease of assembly.

[0012] 3. Due to its high strength, the square key has higher accuracy and reliability when used as a secondary limit switch. Attached Figure Description

[0013] Appendix Figure 1 This is a three-dimensional structural diagram of the present invention.

[0014] Appendix Figure 2 This is a three-dimensional structural diagram of the valve stem of this utility model.

[0015] Appendix Figure 3 This is a schematic diagram of the three-dimensional structure of the sphere of this utility model.

[0016] Appendix Figure 4 This is a three-dimensional structural diagram of the cylindrical pin of this utility model.

[0017] Appendix Figure 5 This is a cross-sectional view of the installation structure of this utility model inside the valve.

[0018] Appendix Figure 6 This is a schematic diagram of the limiting groove structure of this utility model.

[0019] Appendix Figure 1 —In section 6, valve stem 1, cylindrical pin 2, ball 3, assembly pin 4, square key 5, cylindrical recess 6, semi-circular cylindrical pin recess 7, semi-circular cylindrical pin groove 8, direction indicator groove 9, limit groove 10. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] Appendix Figure 1A new type of fixed ball valve drive chain matching structure is shown in 6, which comprises a square key, a valve rod, a cylindrical pin and a ball; the upper side of the valve rod 1 is provided with a square key groove, the top surface is provided with a direction indicating groove 9, and the bottom side of the valve rod 1 is provided with four evenly distributed semicircular cylindrical pin grooves 8; the ball 3 is provided with a cylindrical pit 6, and the side wall of the cylindrical pit 6 is evenly provided with four semicircular cylindrical pin pits 7.

[0022] The square key 5 is fixed in the square key groove of the valve rod 1 by a mounting pin 4, the valve rod 1 is inserted and mounted in the cylindrical pit 6 provided on the ball 3, the cylindrical pin 2 is inserted and mounted in the four semicircular cylindrical pin pits 7 on the ball 3, and is matched with the four semicircular cylindrical pin grooves 8 of the valve rod 1, so that the power transmission of the drive chain from the square key 5 to the ball 3 is completed.

[0023] When the drive chain works, the valve rod 1 serves as a rotary drive shaft, an externally applied force acts on the side edge surface of the valve rod 1 and the square key 5, so that the valve rod 1 obtains a rotatable force, then the force is uniformly distributed on the cylindrical pin 2 through the pin hole at the bottom of the valve rod 1 and is transmitted to the ball 3, so as to drive the ball 3 to rotate. When the square key 5 rotates to a specified state, the ball 3 can complete the corresponding action, and the state of the middle passage of the ball 3 can be indicated according to the direction indicating groove 9 at the end of the valve rod 1. A limiting groove 10 is arranged on the connecting disc of the valve, and the square key 5 can cooperate with the limiting groove to limit.

[0024] The beneficial effects of the utility model are as follows:

[0025] 1. The ball and the valve rod are matched by the cylindrical pin, compared with the four-square connection, the use of the cylindrical pin can make the opening size of the connection position of the ball and the valve rod relatively small under the guarantee of the same design strength, so as to weaken the influence of the opening of the connection structure on the strength of the ball. The connection structure is uniformly stressed and dispersed on the outer surface of each cylindrical pin, stress concentration is avoided, a larger torque transmission can be borne, and the centering and guiding of the valve rod are greatly improved.

[0026] 2. The drive key of the valve rod is improved to the square key, and the matching strength is improved, the number of drive keys can be reduced under the condition of the same torque, and the assembly convenience is strengthened.

[0027] 3. The square key has higher accuracy and reliability when used as secondary limiting due to its high strength.

[0028] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A novel fixed ball valve drive train mating structure characterized by: It includes square key, valve rod, cylindrical pin, ball; the upper side of the valve rod is provided with square key groove, the top is provided with direction indicating groove, the bottom side of the valve rod is provided with four evenly distributed semicircle cylindrical pin grooves; the ball is provided with cylindrical pit, the side wall of the cylindrical pit is evenly distributed with four semicircle cylindrical pin pits.

2. A new fixed ball valve drive train mating structure according to claim 1, characterized in that: The square key is fixed in the square key groove of the valve rod by assembly pin, the bottom of the valve rod is inserted and assembled in the cylindrical pit provided on the ball, the cylindrical pin is inserted and assembled in the four semicircle cylindrical pin pits on the ball, cooperates with the four semicircle cylindrical pin grooves on the valve rod, and the power transmission from the square key to the ball of the drive chain is completed.

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