Ball valve

Abstract

The utility model relates to the technical field of valves, in particular to a ball valve which comprises a valve body, a valve rod, a ball core and an end pipe, an installation hole used for installing the valve rod is formed in the valve body, the valve rod penetrates through the installation hole, one end of the valve rod is located outside the valve body, the other end of the valve rod is installed on the ball core, and the ball core is movably installed in the valve body. The ball valve further comprises a supporting block and a sealing ring, the supporting block is provided with a through hole, the supporting block is installed on the inner circumference of the end of the valve body, the end pipe is installed on the valve body, the through hole is communicated with the end pipe, an installation groove is formed in the inner side of the supporting block, the sealing ring is installed in the installation groove, and the two end faces of the sealing ring abut against the ball core and the installation groove respectively. The outer wall and the end face of the sealing ring are supported and pressed by the mounting groove, and a pressing structure does not need to be arranged on the end face of the sealing ring, so that the axial position precision of the sealing ring is not influenced by the position of the pressing structure and the welding precision, and internal leakage caused by unstable sealing performance is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field more particularly, relate to a ball valve. BACKGROUND

[0002] The sealing ring 3 compression mode of the existing ball valve on the market is that the pressing block 10 of PE material is matched with the inner diameter and bottom of the sealing ring 3, is installed on the support block 2 in reverse buckling, and then is welded together with the end pipe 9, the sealing ring 3 axial position precision of this sealing ring 3 compression structure is influenced by the position precision of the pressing block 10, and the position stability of the pressing block 10 is easily influenced by the welding process quality precision, thereby affecting the compression effect of the sealing ring 3, and the unstable sealing performance can cause the risk of internal leakage, as shown in Figure 1 SUMMARY

[0003] The utility model discloses a ball valve, which can guarantee the axial position precision of the sealing ring and stabilize the sealing effect of the sealing ring.

[0004] To solve the above technical problems, the utility model adopts the technical scheme of:

[0005] A ball valve is provided, which comprises a valve body, a valve rod, a ball core and an end pipe, the valve body is provided with a mounting hole for mounting the valve rod, the valve rod passes through the mounting hole, one end of the valve rod is located outside the valve body, and the other end is mounted on the ball core, the ball core is movably mounted in the valve body, the ball valve further comprises a support block provided with a through hole and a sealing ring, the support block is mounted on the inner periphery of the end of the valve body, the end pipe is mounted on the valve body, the through hole is in communication with the end pipe, the inner side of the support block is provided with a mounting groove, the sealing ring is mounted in the mounting groove, and the two end faces of the sealing ring are respectively in abutment with the ball core and the mounting groove.

[0006] The ball valve of the utility model, when installing the ball valve, one end of the valve rod is mounted on the ball core, the other end of the valve rod passes through the mounting hole, the sealing ring is mounted in the mounting groove of the support block, the support block is mounted on the valve body, the two end faces of the sealing ring are in abutment with the ball core and the mounting groove, the end pipe is mounted on the valve body, and the installation of the ball valve is completed; since the two ends of the sealing ring are in abutment with the ball core and the mounting groove respectively, the mounting groove supports and compresses the outer wall and the end face of the sealing ring, a compression structure does not need to be arranged on the end face of the sealing ring, the axial position precision of the sealing ring is not influenced by the position of the compression structure and the welding precision, and internal leakage caused by unstable sealing performance is prevented.

[0007] ​Further, a sealing sheath is mounted on the support block, the sealing sheath is located inside the sealing ring, and the inner wall of the sealing ring is in abutment with the outer wall of the sealing sheath. When the ball valve is installed, the sealing ring is installed into the installation groove of the support block, and then the sealing sheath is pressed into the inside of the sealing ring. The sealing sheath can press the inner wall of the sealing ring, thereby improving the pressing effect on the sealing ring in the radial direction without affecting the axial position accuracy of the sealing ring.

[0008] Further, the sealing sheath comprises a pressing part and a first limiting part. The pressing part is in abutment with the inner wall of the sealing ring. The first limiting part is provided with a first reverse buckle extending from the first limiting part to the support block. The support block is provided with a first reverse buckle groove matched with the first reverse buckle. The first reverse buckle is clamped in the first reverse buckle groove. The first reverse buckle groove can limit the pressing depth of the sealing sheath, thereby ensuring the pressing area requirement of the pressing part and the sealing ring. Meanwhile, the first reverse buckle of the first limiting part is matched with the first reverse buckle groove, thereby playing an axial positioning role on the sealing sheath to prevent the sealing sheath from being pressed into the first reverse buckle groove and then being pulled out.

[0009] Further, the radial thickness of the pressing part is greater than the radial thickness of the first limiting part. The greater thickness of the pressing part is conducive to cooperating with the sealing ring to press the sealing ring. The smaller thickness of the first limiting part makes the first limiting part more easily elastically deformed, thereby facilitating the installation of the first reverse buckle into the first reverse buckle groove.

[0010] Further, one end of the sealing sheath is in abutment with the ball core, and the other end is in abutment with the end face of the end pipe. During the operation of the valve, especially in the closed state, the ball core is pushed by the gas pressure, and the ball core generates an axial thrust on the support block, the sealing ring and the sealing sheath. The end face of the end pipe axially supports the sealing sheath, thereby making the installation of the sealing sheath and the sealing ring more stable.

[0011] Further, the support block is provided with a second reverse buckle, the valve body is provided with a second reverse buckle groove matched with the second reverse buckle, and the second reverse buckle is installed in the second reverse buckle groove. The support block is installed on the valve body through the cooperation of the second reverse buckle and the second reverse buckle groove.

[0012] Further, a first valve rod ring is further included. The first valve rod ring is sleeved on the valve rod, and the inner wall and the outer wall of the first valve rod ring are in abutment with the side surface of the valve rod and the inner wall of the installation hole, respectively. The first valve rod ring can realize the sealing between the valve rod and the installation hole.

[0013] Further, the valve rod comprises a valve rod body and a second limiting part with the same axis, the diameter of the valve rod body is smaller than that of the second limiting part, the valve rod body is installed in the mounting hole, and the upper surface of the second limiting part is in abutment with the valve body and the second limiting part is connected with the ball core. The second limiting part can limit the depth of the valve rod penetrating into the mounting hole, facilitating installation.

[0014] Further, a second valve rod ring is arranged between the second limiting part and the valve body, and the two end surfaces of the second valve rod ring are in abutment with the second limiting part and the valve body respectively. The second valve rod ring can realize sealing between the second limiting part and the valve body.

[0015] Further, a base is fixed at the bottom of the valve body. The base serves as a support for the valve body.

[0016] Compared with the prior art, the ball valve has the following beneficial effects:

[0017] The ball valve has the following advantages: 1. The installation groove supports and compresses the outer wall and end surface of the sealing ring, and no compression structure needs to be arranged on the end surface of the sealing ring, so that the axial position precision of the sealing ring is not affected by the position of the compression structure and the welding precision; 2. The sealing sleeve can compress the inner wall of the sealing ring, thereby improving the compression effect on the sealing ring and not affecting the axial position precision of the sealing ring; 3. The ball core and the end pipe axially support the sealing sleeve, so that the sealing sleeve and the sealing ring are more stable in installation; and 4. The sealing sleeve is designed to have a structure in which the compression part is thicker than the limiting part, so as to facilitate installation and ensure the compression effect. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic view of a ball valve in the background art;

[0019] Figure 2 is a structural schematic view of a ball valve of the present application;

[0020] Figure 3 is a first structural schematic view of a sealing sleeve of the ball valve of the present application;

[0021] Figure 4 is a second structural schematic view of a sealing sleeve of the ball valve of the present application;

[0022] In the drawings: 1, valve body; 11, mounting hole; 12, base; 2, support block; 21, installation groove; 22, first reverse buckle groove; 23, second reverse buckle; 3, sealing ring; 4, sealing sleeve; 41, compression part; 42, first limiting part; 5, valve rod; 51, valve rod body; 52, second limiting part; 53, operation cap; 6, first valve rod ring; 7, second valve rod ring; 8, ball core; 9, end pipe; 10, compression block. DETAILED DESCRIPTION

[0023] The utility model will be further explained in connection with the specific implementation. Among them, the drawing is only used for example explanation, and the representation is only a schematic diagram, and cannot be understood as the limitation of the patent; in order to better illustrate the embodiment of the utility model, some components of the drawing will be omitted, enlarged or reduced, and the size of actual product is not represented; for those skilled in the art, it is understandable that some well-known structures and their description in the drawing can be omitted.

[0024] The same or similar reference numerals in the drawings of the embodiments of the utility model correspond to the same or similar components; in the description of the utility model, it is understood that if the orientation or position relationship indicated by the terms "upper", "lower", "left", "right" and the like is based on the orientation or position relationship shown in the drawing, it is only for the convenience of describing the utility model and simplifying the 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, therefore the terms describing the position relationship in the drawing are only used for example explanation, and cannot be understood as the limitation of the patent, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific situation.

[0025] Embodiment one

[0026] As Figures 2 to 4 The first embodiment of the ball valve of the utility model is shown, including valve body 1, valve stem 5, ball core 8 and end pipe 9, the installation hole 11 for installing valve stem 5 is equipped on valve body 1, valve stem 5 passes through the installation hole 11, one end of valve stem 5 is located outside valve body 1, the other end is installed on ball core 8, ball core 8 is movably installed in valve body 1, the ball valve further includes support block 2 with through hole and sealing ring 3, support block 2 is installed in the inner periphery of the end of valve body 1, end pipe 9 is installed on the valve body 1, the through hole is communicated with end pipe 9, the inner side of support block 2 is equipped with installation groove 21, sealing ring 3 is installed in installation groove 21, and the two end faces of sealing ring 3 are respectively abutted with ball core 8 and installation groove 21.

[0027] The ball valve of the utility model, when installing the ball valve, one end of valve stem 5 is installed on ball core 8, the other end of valve stem 5 passes through installation hole 11, sealing ring 3 is installed in installation groove 21 of support block 2, support block 2 is installed on valve body 1, the two end faces of sealing ring 3 are abutted with ball core 8 and installation groove 21, end pipe 9 is installed on valve body 1, and the installation of the ball valve is completed; because the two ends of sealing ring 3 are respectively abutted with ball core 8 and installation groove 21, installation groove 21 supports and compresses the outer wall and end face of sealing ring 3, does not need to set up compression structure on the end face of sealing ring 3, the axial position precision of sealing ring 3 is not affected by the position of compression structure and welding precision, and prevents internal leakage due to unstable sealing performance.

[0028] As Figure 2 shown, the end pipe 9 and the support block 2 are both provided with two, two support blocks 2 are respectively installed at the left and right ends of the valve body 1, and two end pipes 9 are respectively welded at the left and right ends of the valve body 1.

[0029] As Figure 3 shown, the sealing sheath 4 is installed on the support block 2, the sealing sheath 4 is located on the inner side of the sealing ring 3, and the inner wall of the sealing ring 3 abuts against the outer wall of the sealing sheath 4. When installing the ball valve, the sealing ring 3 is installed into the mounting groove 21 of the support block 2, and then the sealing sheath 4 is pressed into the inner side of the sealing ring 3. The sealing sheath 4 can press the inner wall of the sealing ring 3, thereby improving the pressing effect on the sealing ring 3 in the radial direction without affecting the axial position accuracy of the sealing ring 3.

[0030] It also includes a base 12 fixed at the bottom of the valve body 1. The base 12 plays a supporting role for the valve body 1.

[0031] It also includes an operating cap 53 installed at the top of the valve stem 5, which facilitates the operation of the valve stem 5.

[0032] The working principle of the ball valve of the embodiment is as follows: when installing the ball valve, one end of the valve stem 5 is installed on the ball core 8, the other end of the valve stem 5 is inserted through the mounting hole 11, the ball core 8 is movably installed in the valve body 1, and the operating cap 53 is installed at the top of the valve stem 5; the sealing ring 3 is installed in the mounting groove 21 of the support block 2, and then the sealing sheath 4 is pressed into the inner side of the sealing ring 3 and the support block 2; the valve body 1 with the installed valve stem 5 and ball core 8 and the support block 2 with the installed sealing ring 3 and sealing sheath 4 are respectively clamped on the installation equipment for installation; after the support block 2 is installed on the valve body 1, the two end surfaces of the sealing ring 3 abut against the ball core 8 and the mounting groove 21; the valve body 1 with the installed left and right support blocks 2 and the left and right end pipes 9 are respectively clamped on the corresponding clamps of the special plane welding machine, and the left and right end pipes 9 are simultaneously welded with the valve body 1 according to the set welding process parameters, and after welding, the end pipe 9 and the valve body 1 form an integrated structure; the base 12 is welded at the bottom of the valve body 1, and the installation of the ball valve is completed.

[0033] Example Two

[0034] This embodiment is the second embodiment of the ball valve of the utility model, which is similar to the first embodiment, and the difference lies in that, as Figure 3 and Figure 4As shown, the sealing sheath 4 comprises a pressing portion 41 and a first limiting portion 42, the pressing portion 41 abuts against the inner wall of the sealing ring 3, and the first limiting portion 42 is provided with a first undercut extending from the first limiting portion 42 to the support block 2, and the support block 2 is provided with a first undercut groove 22 matched with the first undercut, and the first undercut is clamped in the first undercut groove 22. The first undercut groove 22 can limit the pressing depth of the sealing sheath 4, and ensure the pressing area requirement of the pressing portion 41 and the sealing ring 3; meanwhile, the first undercut of the first limiting portion 42 is matched with the first undercut groove 22, which can play the role of axial positioning of the sealing sheath 4, preventing the sealing sheath 4 from being pressed into the first undercut groove 22 and then being pulled out.

[0035] The radial thickness of the pressing portion 41 is greater than that of the first limiting portion 42. The pressing portion 41 has a large thickness, which is beneficial to cooperate with the sealing ring 3 to press the sealing ring 3; the first limiting portion 42 has a small thickness, which makes the first limiting portion 42 more easily elastically deformed, facilitating the installation of the first undercut into the first undercut groove 22.

[0036] One end of the sealing sheath 4 abuts against the ball core 8, and the other end abuts against the end face of the end pipe 9. During the operation of the valve, especially in the closed state, the ball core 8 is pushed by the gas pressure, and the ball core 8 generates an axial thrust on the support block 2, the sealing ring 3 and the sealing sheath 4, and the end face of the end pipe 9 axially supports the sealing sheath 4, making the installation of the sealing sheath 4 and the sealing ring 3 more stable.

[0037] The support block 2 is provided with a second undercut 23, and the valve body 1 is provided with a second undercut groove matched with the second undercut 23, and the second undercut 23 is installed in the second undercut groove. The support block 2 is installed on the valve body 1 through the cooperation of the second undercut 23 and the second undercut groove.

[0038] The working principle of the ball valve of the embodiment is as follows: when installing the ball valve, the sealing ring 3 is installed in the installation groove 21, the sealing sheath 4 is pressed into the inside of the sealing ring 3, then the sealing sheath 4 is continuously moved in the same direction, the first undercut of the first limiting portion 42 is pressed into the first undercut groove 22 to limit the sealing sheath 4; the second undercut 23 of the two support blocks 2 installed with the sealing ring 3 and the sealing sheath 4 is clamped into the second undercut groove at both ends of the valve body 1, and the two end pipes 9 are respectively welded at both ends of the valve body 1, and the end face of the end pipe 9 and the ball core 8 respectively abut against the two end faces of the sealing sheath 4 to axially support the sealing sheath 4, so as to ensure that the sealing sheath 4 and the sealing ring 3 can be stably installed.

[0039] Embodiment three

[0040] This embodiment is the third embodiment of the ball valve of this utility model. Similar to Embodiment Two, the difference lies in the inclusion of a first valve stem ring 6. The first valve stem ring 6 is sleeved on the valve stem 5, and its inner and outer walls abut against the side of the valve stem 5 and the inner wall of the mounting hole 11, respectively. The first valve stem ring 6 enables a seal between the valve stem 5 and the mounting hole 11.

[0041] like Figure 2 As shown, the valve stem 5 includes a valve stem body 51 and a second limiting part 52 with the same axis. The diameter of the valve stem body 51 is smaller than the diameter of the second limiting part 52. The valve stem body 51 is installed in the mounting hole 11. The upper surface of the second limiting part 52 abuts against the valve body 1, and the second limiting part 52 is connected to the ball core 8. The second limiting part 52 can limit the depth of the valve stem 5 entering the mounting hole 11, facilitating installation.

[0042] It also includes a second valve stem ring 7, which is located between the second limiting part 52 and the valve body 1. The two end faces of the second valve stem ring 7 abut against the second limiting part 52 and the valve body 1, respectively. The second valve stem ring 7 can achieve a seal between the second limiting part 52 and the valve body 1.

[0043] The first valve stem ring 6 and the second valve stem ring 7 work together to achieve a double seal on the mounting hole 11.

[0044] The working principle of the ball valve in this embodiment is as follows: When installing the ball valve, the second valve stem ring 7 is fitted onto the valve stem 5, the second limiting part 52 supports the second valve stem ring 7, one end of the valve stem 5 is installed on the ball core 8, several first valve stem rings 6 are installed in the mounting hole 11, and the other end of the valve stem 5 is passed through the mounting hole 11. The valve stem body 51 and the mounting hole 11 squeeze the first valve stem ring 6, and the second limiting part 52 and the valve body 1 squeeze the second valve stem ring 7, achieving a double seal on the mounting hole 11; the ball core 8 is movably installed in the valve body 1; the sealing ring 3 is installed in the mounting groove 21 of the support block 2, and then the sealing sleeve 4 is pressed into the inside of the sealing ring 3. The first undercut of the first limiting part 42 of the sealing sleeve 4 is pressed into the first undercut groove 22 of the support block 2, achieving a limiting effect on the sealing sleeve 4; The valve body 1 with valve stem 5 and ball core 8 installed, and the support block 2 with sealing ring 3 and sealing sleeve 4 installed, are respectively clamped onto the installation equipment, so that the second buckle 23 on the support block 2 is engaged with the second buckle groove on the valve body 1 for installation; after the support block 2 is installed on the valve body 1, the two end faces of the sealing ring 3 abut against the ball core 8 and the mounting groove 21 respectively; the valve body 1 with the left and right support blocks 2 installed and the left and right end pipes 9 are respectively clamped onto the corresponding fixtures of the special flat welding machine, and the left and right end pipes 9 are simultaneously welded to the valve body 1 according to the set welding process parameters, so that the end pipes 9 abut against the sealing sleeve 4, providing axial support for the sealing sleeve 4. After welding, the end pipe 9 and the valve body 1 form an integrated structure; the base 12 is welded to the bottom of the valve body 1 to complete the installation of the ball valve.

[0045] In the specific contents of the above specific embodiments, each technical feature can be combined arbitrarily without contradiction, in order to make the description simple, all possible combinations of the above technical features are not described, however, as long as the combination of these technical features does not exist contradiction, it should be considered that it is within the scope of the description.

[0046] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, on the basis of the above description, other different forms of changes or changes can be made. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claims.

Claims

1. A ball valve, comprising a valve body (1), a valve stem (5), a ball core (8), and an end pipe (9), wherein the valve body (1) is provided with a mounting hole (11) for mounting the valve stem (5), the valve stem (5) passes through the mounting hole (11), one end of the valve stem (5) is located outside the valve body (1), and the other end is mounted on the ball core (8), the ball core (8) being movably mounted in the valve body (1), characterized in that, It also includes a support block (2) with a through hole and a sealing ring (3). The support block (2) is installed on the inner circumference of the end of the valve body (1). The end tube (9) is installed on the valve body (1). The through hole communicates with the end tube (9). The inner side of the support block (2) is provided with a mounting groove (21). The sealing ring (3) is installed in the mounting groove (21). The two end faces of the sealing ring (3) abut against the ball core (8) and the mounting groove (21) respectively.

2. The ball valve according to claim 1, characterized in that, It also includes a sealing sleeve (4) installed on the support block (2), the sealing sleeve (4) being located inside the sealing ring (3), and the inner wall of the sealing ring (3) abutting against the outer wall of the sealing sleeve (4).

3. The ball valve according to claim 2, characterized in that, The sealing sleeve (4) includes a pressing part (41) and a first limiting part (42). The pressing part (41) abuts against the inner wall of the sealing ring (3). The first limiting part (42) is provided with a first undercut extending from the first limiting part (42) to the support block (2). The support block (2) is provided with a first undercut groove (22) that cooperates with the first undercut. The first undercut is engaged in the first undercut groove (22).

4. The ball valve according to claim 3, characterized in that, The radial thickness of the pressing part (41) is greater than the radial thickness of the first limiting part (42).

5. The ball valve according to claim 2, characterized in that, One end of the sealing sleeve (4) abuts against the ball core (8), and the other end abuts against the end face of the end tube (9).

6. The ball valve according to claim 1, characterized in that, The support block (2) is provided with a second buckle (23), and the valve body (1) is provided with a second buckle groove that cooperates with the second buckle (23). The second buckle (23) is installed in the second buckle groove.

7. The ball valve according to any one of claims 1 to 6, characterized in that, It also includes a first valve stem ring (6), which is sleeved on the valve stem (5). The inner wall and outer wall of the first valve stem ring (6) abut against the side of the valve stem (5) and the inner wall of the mounting hole (11), respectively.

8. The ball valve according to claim 7, characterized in that, The valve stem (5) includes a valve stem body (51) and a second limiting part (52) with the same axis. The diameter of the valve stem body (51) is smaller than the diameter of the second limiting part (52). The valve stem body (51) is installed in the mounting hole (11). The upper surface of the second limiting part (52) abuts against the valve body (1) and the second limiting part (52) is connected to the ball core (8).

9. The ball valve according to claim 8, characterized in that, It also includes a second valve stem ring (7), which is located between the second limiting part (52) and the valve body (1), and the two end faces of the second valve stem ring (7) abut against the second limiting part (52) and the valve body (1) respectively.

10. The ball valve according to claim 1, characterized in that, It also includes a base (12) which is fixed to the bottom of the valve body (1).

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