CN212745126U

CN212745126U - High-sealing-performance three-piece ball valve

Info

Publication number: CN212745126U
Application number: CN202021060232.3U
Authority: CN
Inventors: 宗城辉; 李磊; 李斌
Original assignee: Hohhot Mengwa Valve Industry Co ltd
Current assignee: Hohhot Mengwa Valve Industry Co ltd
Priority date: 2020-06-10
Filing date: 2020-06-10
Publication date: 2021-03-19
Anticipated expiration: 2030-06-10

Abstract

The utility model belongs to the technical field of the valve, concretely relates to three-piece ball valve with high sealing performance, including the valve body, the left valve piece and the right valve piece are clamped on the left and right sides of the valve body, the valve ball is arranged in the valve body, the top of the valve ball is connected with the valve rod, the valve rod upwards penetrates out of the valve body and is connected with the cylinder, the valve body is provided with an installation cavity and a sealing cavity, the valve ball is arranged in the installation cavity below, and the valve rod penetrates through the installation cavity; the installation cavity is the notch cuttype, by supreme first sealed section, the sealed section of second, adaptation section and the sealed section of third that includes the size grow gradually down in proper order. The utility model provides a three formula ball valves of high leakproofness adopts multiple seal structure, improves the sealing performance of ball valve, reduces the maintenance rate.

Description

High-sealing-performance three-piece ball valve

Technical Field

The utility model belongs to the technical field of the valve, concretely relates to three formula ball valves of high leakproofness.

Background

A high leakproofness three-piece ball valve utilizes compressed air to drive the valve rod rotatory to realize the purpose that remote control ball valve opened and close. The ball valve is suitable for places which need to be opened and closed frequently and are inconvenient to operate manually, and the requirement on the sealing property between the valve body and the valve rod is high. However, the existing three-piece ball valve with high sealing performance has high failure rate, and the sealing problem often occurs after the ball valve is used for a period of time.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a three formula ball valves of high leakproofness adopts multiple seal structure, improves the sealing performance of ball valve, reduces the maintenance rate.

The purpose of the utility model is realized like this: a high-sealing three-piece ball valve comprises a valve body, wherein a left valve piece and a right valve piece are clamped on the left side and the right side of the valve body, a valve ball is arranged in the valve body, the top of the valve ball is connected with a valve rod, the valve rod upwards penetrates through the valve body and is connected with an air cylinder, the valve body is provided with an installation cavity and a sealing cavity, the valve ball is located in the installation cavity below the valve ball, and the valve rod penetrates through the installation cavity; the mounting cavity is in a stepped shape and sequentially comprises a first sealing section, a second sealing section, an adapting section and a third sealing section, the size of the first sealing section, the second sealing section, the adapting section and the third sealing section gradually increases from bottom to top, a sealing ring is sleeved in the middle of the valve rod and is in sealing fit with the first sealing section, upper sealing filler is arranged at the bottom of the second sealing section around the valve rod, a pressing ring is arranged at the upper part of the second sealing section, a pair of disc springs are arranged above the pressing ring and sleeved on the valve rod and located at the adapting section, and the valve rod is in threaded connection with a; the nut is located the third seal section and sets up sealed lid between nut periphery or nut and the dish spring, and the top opening of adaptation section is shielded to sealed lid.

Furthermore, the top of the pressure ring is arc-shaped.

Further, the top of the installation cavity is provided with a sealing groove, lower sealing filler is arranged in the sealing groove around the valve rod, the lower end of the valve rod is provided with a convex ring, and the convex ring covers the lower sealing filler.

Furthermore, the bottom of the adapting section is provided with a constant pressure hole.

Furthermore, valve seats are arranged at two ends of the valve ball.

Compared with the prior art, the utility model outstanding and profitable technological effect is: utilize sealing washer and filler, realize the multiple seal between valve rod and the valve body, sealed lid plays the guard action, reduces external impurity and gets into the adaptation section, guarantees the reliability of dish spring work.

Drawings

Fig. 1 is a schematic structural diagram of a high-sealing three-piece ball valve in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a seal cavity in an embodiment of the present invention.

Reference numerals: 1. a cylinder; 2. a valve body; 2a, a first sealing section; 2b, a second sealing section; 2c, an adaptation segment; 2d, a third sealing section; 2e, mounting a cavity; 2f, sealing grooves; 2g, constant pressure hole; 3. a valve stem; 3a, a convex ring; 4. a sealing cover; 5. a disc spring; 6. pressing a ring; 7. upper sealing filler; 8. a valve ball; 9. a valve seat; 10. a left valve plate; 11. a right valve plate; 12. a nut; 13. and a lower sealing filler.

Detailed Description

The following describes the present invention in further detail with reference to the accompanying drawings.

A three-piece ball valve with high sealing performance is shown in figure 1 and comprises a valve body 2, a left valve piece 10 and a right valve piece 11, wherein the left side and the right side of the valve body 2 are clamped tightly, and the three are connected through bolts. A valve ball 8 is arranged in the valve body 2, and valve seats 9 are arranged on two sides of the valve ball 8. The top of the valve ball 8 is connected with a valve rod 3, and the valve rod 3 upwards penetrates out of the valve body 2 and is connected with the cylinder 1. With reference to fig. 2, the valve body 2 is provided with an installation cavity 2e and a sealing cavity, the valve ball 8 is located in the installation cavity 2e below, and the valve rod 3 penetrates through the installation cavity 2 e; the mounting cavity 2e is of a stepped shape and sequentially comprises a first sealing section 2a, a second sealing section 2b, an adaptation section 2c and a third sealing section 2d, the size of the first sealing section 2a is gradually increased from bottom to top, a sealing ring is sleeved in the middle of the valve rod 3 and is matched with the first sealing section 2a in a sealing mode, an upper sealing filler 7 is arranged at the bottom of the second sealing section 2b around the valve rod 3, a pressing ring 6 is arranged at the upper portion of the second sealing section, a pair of disc springs 5 are arranged above the pressing ring 6, the disc springs 5 are sleeved on the valve rod 3 and are located on the adaptation section 2c, and nuts 12 are screwed on the valve rod 3 above the disc springs 5 to apply downward extrusion force to the disc springs 5; wherein, the nut 12 is located the third seal section 2d and the periphery of the nut 12 or the seal cover 4 is arranged between the nut 12 and the disc spring 5, and the seal cover 4 covers the opening above the adaptation section 2 c. The sealing cover 4 can be made of soft materials such as rubber and the like, and plays a role in dust prevention.

Preferably, the top of the pressing ring 6 is of an arc structure, so that when the inclined surfaces of the disc springs 5 are in contact, the disc springs 5 are not easily abraded, and when the disc springs 5 deform under stress, the pressing ring 6 moves downwards without clamping stagnation.

Wherein, installation cavity 2e top sets up seal groove 2f, sets up lower seal packing 13 around valve rod 3 in seal groove 2f, and the valve rod 3 lower extreme sets up bulge loop 3a, and bulge loop 3a covers lower seal packing 13. The upper sealing filler 7 and the lower sealing filler 13 may be made of PEFE. The pressing forces of the two sealing fillers are oppositely arranged, so that the balance is better.

Referring to fig. 1 and 2, the bottom of the adapter section 2c is provided with a constant pressure hole 2g, and the constant pressure hole 2g can keep the internal and external pressures balanced, and is preferably arranged obliquely.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a three formula ball valves of high leakproofness, includes valve body (2), and left valve block (10) and right valve block (11) press from both sides tightly in the valve body (2) left and right sides, are provided with valve ball (8) in valve body (2), and valve ball (8) top is connected with valve rod (3), and valve rod (3) upwards wear out valve body (2) and are connected with cylinder (1), its characterized in that: the valve body (2) is provided with an installation cavity (2e) and a sealing cavity, the valve ball (8) is positioned in the installation cavity (2e) below, and the valve rod (3) penetrates through the installation cavity (2 e); the mounting cavity (2e) is of a step type and sequentially comprises a first sealing section (2a), a second sealing section (2b), an adaptation section (2c) and a third sealing section (2d) with gradually increased sizes from bottom to top, a sealing ring is sleeved in the middle of the valve rod (3) and is in sealing fit with the first sealing section (2a), an upper sealing filler (7) is arranged at the bottom of the second sealing section (2b) around the valve rod (3), a pressing ring (6) is arranged at the upper part of the second sealing section, a pair of disc springs (5) are arranged above the pressing ring (6), the disc springs (5) are sleeved on the valve rod (3) and are located in the adaptation section (2c), and the valve rod (3) is in threaded connection with a nut (12) above the disc springs (5) so as to apply downward extrusion force to the; the nut (12) is positioned on the third sealing section (2d) and the periphery of the nut (12) or a sealing cover (4) is arranged between the nut (12) and the disc spring (5), and the opening above the adaptive section (2c) is covered by the sealing cover (4).

2. A high-sealability three-piece ball valve according to claim 1, wherein: the top of the compression ring (6) is arc-shaped.

3. A high-sealability three-piece ball valve according to claim 1, wherein: mounting chamber (2e) top sets up seal groove (2f), sets up lower seal packing (13) around valve rod (3) in seal groove (2f), and valve rod (3) lower extreme sets up bulge loop (3a), and lower seal packing (13) are sheltered in bulge loop (3 a).

4. A high-sealability three-piece ball valve according to claim 1, wherein: the bottom of the adapting section (2c) is provided with a constant pressure hole (2 g).

5. A high-sealability three-piece ball valve according to claim 1, wherein: and valve seats (9) are arranged at two ends of the valve ball (8).