Valve rod sealing structure of ball valve

Abstract

The valve rod sealing structure of the ball valve comprises a valve body, a valve rod and a valve element, the valve rod is assembled in a rod hole of the valve body, an inner port of the rod hole is widened to form a first sealing groove, and an outer port of the rod hole is widened to form a second sealing groove. The first sealing piece is arranged in the first sealing groove and is supported by an outer convex clamping edge preset on the first end head of the valve rod; the second sealing piece is arranged in the second sealing groove and pressed by the embedded screw in an abutting mode, a counter bore with an upward opening is formed in the embedded screw, a compression spring is embedded in the counter bore, the valve rod penetrates through the counter bore and the compression spring, the lower end of the compression spring abuts against the bottom of the counter bore, and the upper end of the compression spring abuts against a radial outer protruding part preset on the valve rod. Two seals are arranged on the valve rod, the first sealing piece has adjustability, and the second sealing piece is additionally provided with the embedded screw and the compression spring for cooperative downward pressing, so that the leakage problem caused by insufficient pressure is prevented, and the sealing performance and adjustability of the valve rod are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field especially is the valve rod sealing structure of ball valve. BACKGROUND

[0002] Valve is the device that is used to control fluid's direction, pressure, flow in fluid system, is the device that medium flow or stop in piping and equipment and can control its flow. Ball valve is one of common valve, and ball valve includes valve body, valve rod and valve core, and when using, drives valve core movement through rotating valve rod, reaches control fluid. The existing ball valve needs to set up packing between valve body and valve rod to seal in working condition to ensure that valve rod is sealed. The traditional packing sealing structure is a group of packing cooperating with valve rod sealing, and usually is sealed in the way of pressing tightly from top to bottom along valve rod, lacks adjustability, and lacks sealing at the end of valve rod and valve core connection, so that valve rod position can produce micro leakage due to insufficient pressure or packing wear and tear and other reasons, influence use performance and service life. SUMMARY

[0003] The utility model discloses a valve rod sealing structure of ball valve, further promotes the sealing property and adjustability of valve rod.

[0004] In order to achieve the above object, the utility model adopts the following technical scheme:

[0005] The valve rod sealing structure of ball valve, including valve body, valve rod and valve core, be equipped with valve cavity and the rod hole that communicates valve cavity on the valve body, the valve core is embedded in the valve cavity and can rotate relatively, the valve rod is assembled in the rod hole, and the first end of valve rod is connected with valve core, so that the valve rod can drive the valve core to rotate, and the second end of valve rod protrudes out of the valve body, the inner port of the rod hole is widened to build the first sealing groove, and the outer port of the rod hole is widened to build the second sealing groove, and still include

[0006] The first sealing piece is placed in the first sealing groove and surrounds the valve rod, one end of the first sealing piece is limited by the groove bottom of the first sealing groove, and the other end of the first sealing piece is supported by the pre-set outer convex clamping edge on the first end of the valve rod.

[0007] The second sealing piece is placed in the second sealing groove and surrounds the valve rod, one end of the second sealing piece is limited by the groove bottom of the second sealing groove, and the other end of the second sealing piece is pressed by the embedded screw, the embedded screw is screwed with the valve body, and the counterbore with the opening facing up is arranged on the embedded screw, the compression spring is embedded in the counterbore, the valve rod passes through the counterbore and the compression spring, the lower end of the compression spring supports the hole bottom of the counterbore, and the upper end of the compression spring supports the pre-set radial outer convex part on the valve rod.

[0008] The scheme further comprises a fine adjustment structure between the radial outward protruding part and the valve body, which is used to drive the valve rod to move axially so that the outward protruding clamping edge further supports the first sealing element.

[0009] The fine adjustment structure comprises a fine adjustment screw which is installed on the preset outward protruding platform of the valve body through threaded connection, and the small end of the fine adjustment screw penetrates upward from the outward protruding platform and supports the lower side of the radial outward protruding part.

[0010] The fine adjustment structure comprises a fine adjustment screw which is installed on the radial outward protruding part through threaded connection, and the small end of the fine adjustment screw penetrates downward from the radial outward protruding part and supports the upper side of the preset outward protruding platform of the valve body.

[0011] The radial outward protruding part is a sheet body which is sleeved on the valve rod, and a nut is assembled on the valve rod, which presses downward on the radial outward protruding part.

[0012] The radial outward protruding part is a sheet body which is sleeved on the valve rod, and a clamping spring is assembled on the valve rod, which limits the radial outward protruding part.

[0013] The first sealing element is a fluorine sealing ring.

[0014] The second sealing element is an O-shaped ring or a packing structure.

[0015] The beneficial effects of the utility model are as follows: the valve rod has two seals of the first sealing element and the second sealing element, the first sealing element is arranged at one end of the valve rod connected with the valve core, and has adjustability; the second sealing element is additionally provided with an embedded screw and a compression spring which cooperate to press downward, thereby preventing leakage caused by insufficient pressure; the sealing performance and adjustability of the valve rod are further improved, and the utility model has substantial features and progress compared with the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0016] ATTACHMENT Figure 1 The utility model is a preferable embodiment structure schematic view.

[0017] ATTACHMENT Figure 2 The utility model is another embodiment structure schematic view. Figure 1 The embodiment structure exploded schematic view.

[0018] ATTACHMENT Figure 3 The utility model is another embodiment structure schematic view. DETAILED DESCRIPTION

[0019] The conception, specific structure and generated technical effects of the utility model will be further described below with reference to the drawings, so that the purpose, features and effects of the utility model can be fully understood.

[0020] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is merely for the convenience of description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0021] Referring to Figure 1 , 2 , 3, it is a preferred embodiment structure diagram of the present application, the present application relates to a ball valve stem sealing structure, comprising a valve body 1, valve stem 2, valve core 3, first sealing element 4 and second sealing element 5. The valve body 1 is provided with valve cavity 11 and communicating valve cavity stem hole 12, valve core 3 is embedded in the valve cavity and can rotate relative to each other, valve stem 2 is assembled in the stem hole 12, and the first end of the valve stem 2 is connected with the valve core 3, so that the valve stem 2 can drive the valve core 3 to rotate, and the second end of the valve stem 2 protrudes out of the valve body 1. The inner port of the stem hole 12 is widened to form a first sealing groove 121, and the outer port of the stem hole 12 is widened to form a second sealing groove 122. The first sealing element 4 is placed in the first sealing groove 121 and surrounds the valve stem 2, one end of the first sealing element 4 is limited by the groove bottom of the first sealing groove 121, and the other end of the first sealing element 4 is supported by the pre-set outer convex clamping edge 21 on the first end of the valve stem 2, the outer convex clamping edge 21 is integrally made with the valve stem 2, and the outer convex clamping edge 21 is annular; The valve stem 2 is inserted into the stem hole 12 from bottom to top, which satisfies that the outer convex clamping edge 21 supports and supports the first sealing element 4 from bottom to top, the first sealing element 4 is preferably a fluorine sealing ring, which is durable, corrosion resistant, and conducive to the rotating work of the valve stem 2. The second sealing element 5 is placed in the second sealing groove 122 and surrounds the valve stem 2, one end of the second sealing element 5 is limited by the groove bottom of the second sealing groove 122, and the other end of the second sealing element 5 is pressed by the embedded screw 6, the embedded screw 6 is threadedly connected with the valve body 1, and the embedded screw 6 is provided with a counterbore 61 with an opening facing upward, the counterbore 61 is embedded with a compression spring 7, the valve stem 2 passes through the counterbore 61 and the compression spring 7, the lower end of the compression spring 7 supports the hole bottom of the counterbore 61, and the upper end of the compression spring 7 supports the pre-set radial outer convex part 22 on the valve stem 2. The structure realizes that the embedded screw 6 presses the second sealing element 5, and increases the compression spring 7 supporting the embedded screw 6, effectively prevents the embedded screw 6 from loosening, and ensures the sealing performance of the second sealing element 5. The second sealing element 5 is preferably an O-shaped ring or a packing structure, which is simple in structure and convenient to manufacture and assemble.

[0022] Figure 1 , 2, 3, in the embodiment, the radial convex part 22 and the valve body 1 are also provided with a fine adjustment structure, which is used for driving the valve stem 2 to move axially, so that the outer convex clamping edge 21 further supports the first sealing element 4, and the sealing effect is adjusted.

[0023] Further, Figure 1 、 2 As shown in the figure, the fine adjustment structure comprises a fine adjustment screw 8, which is installed on the preset outwardly extending platform 13 of the valve body 1 through threaded connection, and the small end of the fine adjustment screw 8 penetrates out of the outwardly extending platform 13 upward and supports the lower side of the radial convex part 22. During adjustment, the radial convex part 22 is upwardly supported by the small end of the fine adjustment screw 8 by rotating the fine adjustment screw 8, so that the valve stem 2 moves upward, and the outer convex clamping edge 21 further presses the first sealing element 4, thereby improving the sealing performance.

[0024] Of course, as shown in the figure, Figure 3 As shown in the figure, the fine adjustment structure comprises a fine adjustment screw 8, which is installed on the preset outwardly extending platform 13 of the valve body 1 through threaded connection, and the small end of the fine adjustment screw 8 penetrates out of the outwardly extending platform 13 upward and supports the lower side of the radial convex part 22. During adjustment, the radial convex part 22 is upwardly supported by the small end of the fine adjustment screw 8 by rotating the fine adjustment screw 8, so that the valve stem 2 moves upward, and the outer convex clamping edge 21 further presses the first sealing element 4, thereby improving the sealing performance.

[0025] In the embodiment, the radial convex part 22 is a sheet body sleeved on the valve stem 2, which is preferably a character-shaped sheet body, and is symmetrically extended leftward and rightward relative to the valve stem, so as to meet the supporting and mounting requirements. In the embodiment, a nut 9 can be assembled on the valve stem 2, which is threadedly connected to the threaded section of the valve stem 2 and downwardly presses the radial convex part 22, so that the radial convex part 22 keeps pressing the compression spring 7 and can form linkage with the valve stem 2. Of course, a clamping spring can also be assembled on the valve stem 2, which limits the radial convex part 22, and the same assembly effect is achieved. During the operation of the fine adjustment structure, although the valve stem moves upward and the compression spring 7 is slightly released, the compression spring 7 still keeps the function of preventing the embedded screw 6 from being released, and the sealing of the second sealing element 5 is not affected.

[0026] The utility model discloses two seals of first sealing element and second sealing element on the valve stem, obtains multistage sealing effect, and first sealing element sets up at one end of valve stem and valve core connection, increases the sealing of valve stem inner end, has adjustable simultaneously, can make sealing adjustment in time, ensures the sealing and prolongs the life, and the second sealing element is increased under the cooperation of embedded screw and compression spring and is pressed, prevents the leakage problem caused by the insufficient pressure, further improves the sealing of valve stem and the adjustability, and the practicality is strong.

[0027] Although the preferred embodiments of the present application have been described in detail above with reference to the accompanying drawings, the present application should not be limited to the structure and operation described above and shown in the drawings, and those skilled in the art can make many equivalent improvements and changes to the above embodiments without departing from the concept and scope of the present application through logical analysis, reasoning or limited experiments, but these improvements and changes should all belong to the scope of the present application.

Claims

1. A ball valve stem seal structure comprising a valve body (1), a valve stem (2) and a valve core (3), characterized in that: The valve body (1) is provided with a valve cavity (11) and a rod hole (12) communicating with the valve cavity, the valve core (3) is embedded in the valve cavity and can rotate relatively, the valve rod (2) is assembled in the rod hole (12), and the first end of the valve rod (2) is connected with the valve core (3), so that the valve rod (2) can drive the valve core (3) to rotate, and the second end of the valve rod (2) protrudes out of the valve body (1); the inner end of the rod hole (12) is widened to form a first sealing groove (121), and the outer end of the rod hole (12) is widened to form a second sealing groove (122), and further comprising A first sealing member (4) is arranged in the first sealing groove (121) and surrounds the valve rod (2), one end of the first sealing member (4) is limited by the groove bottom of the first sealing groove (121), and the other end of the first sealing member (4) is supported by the first end of the valve rod (2) and a pre-set outer protruding clamping edge (21); A second sealing member (5) is arranged in the second sealing groove (122) and surrounds the valve rod (2), one end of the second sealing member (5) is limited by the groove bottom of the second sealing groove (122), and the other end of the second sealing member (5) is pressed by an embedded screw (6), the embedded screw (6) is screwed with the valve body (1), and a counterbore (61) with an opening facing upward is arranged on the embedded screw (6), a compression spring (7) is embedded in the counterbore (61), the valve rod (2) passes through the counterbore (61) and the compression spring (7), the lower end of the compression spring (7) supports the bottom of the counterbore (61), and the upper end of the compression spring (7) supports a pre-set radial outer protruding part (22) on the valve rod (2).

2. The stem seal structure of a ball valve according to claim 1, characterized by: A fine adjustment structure is further arranged between the radial outer protruding part (22) and the valve body (1), the fine adjustment structure is used to drive the valve rod (2) to move axially, so that the outer protruding clamping edge (21) further supports the first sealing member (4).

3. The stem seal structure for a ball valve according to claim 2, characterized by: The fine adjustment structure comprises a fine adjustment screw (8), the fine adjustment screw (8) is installed on a pre-set outer floating table (13) of the valve body (1) through threaded connection, and the small end of the fine adjustment screw (8) passes out upward from the outer floating table (13) and supports the lower side of the radial outer protruding part (22).

4. The stem seal structure for a ball valve according to claim 2, characterized by: The fine adjustment structure comprises a fine adjustment screw (8), the fine adjustment screw (8) is installed on the radial outer protruding part (22) through threaded connection, and the small end of the fine adjustment screw (8) passes out downward from the radial outer protruding part (22) and supports the upper side of the pre-set outer floating table (13) of the valve body.

5. The stem seal structure of a ball valve according to claim 1 or 2, characterized in that: The radial outer protruding part (22) is a sheet body sleeved on the valve rod (2), and a nut (9) is assembled on the valve rod (2), the nut (9) downwardly presses the radial outer protruding part (22).

6. The stem seal structure of a ball valve according to claim 1 or 2, characterized in that: The radial outer protruding part (22) is a sheet body sleeved on the valve rod (2), and a clamping spring is assembled on the valve rod (2), the clamping spring limits the radial outer protruding part (22).

7. The stem seal structure for a ball valve according to claim 1, characterized by: The first sealing member (4) is a four-fluorine sealing ring.

8. The stem seal structure for a ball valve according to claim 1, characterized by: The second sealing member (5) is an O-shaped ring or a packing structure.

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