Ball valve structure with high sealing performance

Abstract

The utility model provides a high-sealing-performance ball valve structure which comprises a ball valve body, a valve ball arranged in an inner cavity of the ball valve body, valve ball gaskets arranged at the front end and the rear end of the valve ball, a ball valve nut in threaded connection with internal threads of the ball valve body and a valve rod arranged in an inner hole of the ball valve body. The end face and / or the side face of the valve ball gasket are / is sealed with the cavity wall of the inner cavity and the ball valve nut through a gasket sealing structure. The valve rod and the inner hole are sealed through a valve rod sealing structure; the ball valve nut and the inner cavity of the ball valve body are sealed through a ball valve nut sealing structure. By optimizing the ball valve sealing structure, the sealing performance of the ball valve structure can be improved, the service life of the ball valve is prolonged, the maintenance cost is reduced, and the harmful substance fluorine is prevented from being separated out.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and more specifically, to a ball valve structure with high sealing performance. Background Art

[0002] At present, the ball gaskets inside the water treatment ball valves on the market are mostly made of polytetrafluoroethylene. Because the traditional polytetrafluoroethylene gaskets are relatively soft, they are easily squeezed and deformed under pressure, which leads to a decrease in sealing performance. In addition, during the water flow process, they are easily scratched by hard foreign objects, causing the gasket to be damaged, thus affecting the sealing performance. In addition, the internal components of the ball valve: the valve ball, valve stem and ball valve nut lack effective sealing structures, resulting in poor overall sealing performance of the ball valve, low stability and reliability, and affecting the service life of the ball valve.

[0003] In view of this, how to design a ball valve structure with high sealing performance is a technical problem that technical personnel in this field need to solve urgently. Utility Model Content

[0004] The present application provides a ball valve structure with high sealing performance, which realizes efficient sealing of various components inside the ball valve and effectively improves the overall sealing performance of the ball valve.

[0005] The present application provides a ball valve structure with high sealing performance, including a ball valve body, a valve ball arranged in the inner cavity of the ball valve body, a valve ball gasket arranged at the front and rear ends of the valve ball, a ball valve nut threadedly connected to the internal thread of the ball valve body, and a valve stem arranged in the inner hole of the ball valve body, the end face and / or side face of the valve ball gasket being sealed with the cavity wall of the inner cavity and the ball valve nut through a gasket sealing structure; the valve stem and the inner hole being sealed through a valve stem sealing structure; the ball valve nut and the inner cavity of the ball valve body being sealed through a ball valve nut sealing structure.

[0006] In some embodiments, the valve ball gasket is specifically a POM gasket;

[0007] The gasket sealing structure includes at least two O-rings, and the outer peripheral surface of each valve ball gasket is provided with a gasket installation groove. Each O-ring is arranged in a one-to-one correspondence in the gasket installation groove of the corresponding valve ball gasket. The O-ring arranged in the inner cavity is used to seal the space between the upper end surface and the side surface of the valve ball gasket and the wall of the inner cavity, and the O-ring arranged in the installation groove of the ball valve nut is used to seal the space between the lower end surface and the side surface of the valve ball gasket and the installation groove.

[0008] In some embodiments, the valve ball gasket is specifically a polytetrafluoroethylene gasket;

[0009] The gasket sealing structure includes an inner cavity sealing rib and an installation groove sealing rib. The inner cavity sealing rib is arranged on the inner cavity wall to compress and seal the upper end surface of the valve ball gasket arranged at the front end. The installation groove sealing rib is arranged at the bottom of the installation groove of the ball valve nut to compress and seal the lower end surface of the valve ball gasket arranged at the rear end.

[0010] In some embodiments, the valve stem is provided with a valve stem boss adapted to fit into the valve ball groove.

[0011] In some embodiments, the valve stem boss is in the shape of a straight line, a cross, a square, or a hexagonal structure.

[0012] In some embodiments, a hexagonal adapter surface for adapting to an hexagonal wrench is provided above the internal thread of the ball valve nut.

[0013] In some embodiments, the valve stem sealing structure includes at least two O-rings.

[0014] In some embodiments, the ball valve nut sealing structure is specifically an O-ring.

[0015] The ball valve structure with high sealing performance provided by the present application realizes effective sealing of the valve ball gasket by setting a gasket sealing structure for sealing the end face and / or side of the valve ball gasket. The gasket sealing structure can be set on the end face and / or side of the valve ball gasket, or can be set on the inner cavity wall of the ball valve body corresponding to the end face and / or side of the sealing valve ball gasket, or can be set in the gasket installation groove of the ball valve nut for installing the valve ball gasket. The setting of the gasket sealing structure can improve the current situation of poor sealing of the valve ball gaskets at the front and rear ends of the valve ball, and significantly improve the sealing performance of the valve ball gaskets at the front and rear ends of the valve ball. In addition, by setting a valve stem sealing structure between the valve stem and the inner hole of the ball valve body, the gap between the two is effectively sealed, ensuring the sealing performance of the valve stem installation. In addition, by setting a ball valve nut sealing structure in the inner cavity of the ball valve body, the gap between the ball valve nut and the inner cavity of the ball valve body is sealed, effectively improving the sealing performance of the ball valve nut.

[0016] In summary, the present application optimizes the sealing structure of the ball valve, thereby significantly improving the sealing performance of the entire ball valve structure. The structure is simple, installation is convenient, and maintenance costs are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of the three-dimensional structure of the ball valve body provided in this application;

[0019] Figure 2 A schematic diagram of the three-dimensional structure of the ball valve nut provided in this application;

[0020] Figure 3 A schematic diagram of the three-dimensional structure of the valve stem provided in this application;

[0021] Figure 4 A schematic diagram of the three-dimensional structure of the valve ball provided in this application;

[0022] Figure 5 A cross-sectional view of a high sealing performance ball valve structure provided for the first specific implementation of the present application;

[0023] Figure 6 for Figure 5 A magnified view of the sealing structure;

[0024] Figure 7 for Figure 6 Schematic diagram of the three-dimensional structure of the middle valve ball gasket;

[0025] Figure 8 A cross-sectional view of a high sealing performance ball valve structure provided for a second specific implementation of the present application;

[0026] Fig. 9 for Figure 8 A magnified view of the sealing structure;

[0027] Among them, 1-ball valve body, 2-valve ball, 3-valve ball gasket, 4-ball valve nut, 5-valve stem, 6-gasket sealing structure, 7-valve stem sealing structure, 8-ball valve nut sealing structure;

[0028] 11-external thread, 12-inner hole, 13-inner cavity sealing rib, 14-inner thread, 15-inner wall, 21-valve ball groove, 31-gasket installation groove, 41-installation groove sealing rib, 42-hexagonal adapter surface, 43-lower thread, 44-groove, 51-valve stem boss, 52-valve stem groove. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] The present application provides a ball valve structure with high sealing performance, which mainly includes a ball valve body 1, a valve ball 2, at least two valve ball gaskets 3, a ball valve nut 4, a valve stem 5, a gasket sealing structure 6, a valve stem sealing structure 7 and a ball valve nut sealing structure 8.

[0031] refer to Figure 1 The upper part of the ball valve body 1 is provided with an external thread 11, which is connected to an external seal through the external thread 11. The interior of the ball valve body 1 is provided with an inner cavity distributed along the axial direction and an inner hole 12 perpendicular to and connected to the inner cavity, and the lower part of the inner cavity is provided with an internal thread 14.

[0032] refer to Figure 2 The ball valve nut 4 is provided with an external thread, which cooperates with the internal thread of the ball valve body 1. The lower side of the ball valve nut 4 is provided with a lower thread 43, which is connected to other quick connectors or drain pipes. The lower outer side of the ball valve nut 4 is provided with a groove 44 for installing the ball valve nut sealing structure 8 to achieve sealing of the ball valve nut 4.

[0033] refer to Figure 3 The valve stem 5 is provided with a valve stem groove 52 for accommodating the valve stem sealing structure 7 , and sealing is achieved with the ball valve body 1 through the valve stem sealing structure 7 .

[0034] refer to Figure 4 The valve ball 2 is arranged in the inner cavity of the ball valve body 1, the valve ball gasket 3 is arranged in the inner cavity of the ball valve body 1, and each valve ball gasket 3 is arranged on the front and rear end surfaces of the valve ball 2 respectively. The inner hole 12 cooperates with the valve stem 5, and the valve stem 5 is sealed by the valve stem sealing structure 7. The internal thread is connected to the ball valve nut 4, and the two parts are fastened to each other. The lower part of the internal thread is provided with an inner wall 15, which cooperates with the groove 44 on the ball valve nut 4, and the two grooves form a mounting groove, and the sealing is achieved by the ball valve nut sealing structure 8.

[0035] In addition, a gasket sealing structure 6 is provided between the cavity wall of the inner cavity and the valve ball gasket 3, and between the mounting groove of the ball valve nut 4 and the ball valve nut 4. The gasket sealing structure 6 is used to seal the end face and / or side face of the valve ball gasket 3 to improve the sealing performance of the valve ball gasket 3.

[0036] Therefore, by providing a gasket sealing structure 6, a valve stem sealing structure 7 and a ball valve nut sealing structure 8 in the ball valve body 1, the ball valve body 1, the valve stem 5 and the ball valve nut 4 are sealed respectively, thereby improving the overall sealing performance of the ball valve structure.

[0037] refer to Figure 5 , Figure 6 and Figure 7 . In a specific embodiment, the valve ball gasket 3 adopts a poly-POM gasket. Since the POM material is relatively hard, it is preferably sealed by a slotted seal. Specifically, the gasket sealing structure 6 includes at least two O-rings. The outer peripheral surface of each valve ball gasket 3 is provided with a gasket installation groove 31. Each O-ring is arranged in a corresponding gasket installation groove 31 in a one-to-one correspondence. The O-ring arranged in the inner cavity is used to seal the space between the upper end surface and the side surface of the valve ball gasket 3 and the inner cavity wall. The O-ring arranged in the groove 44 of the ball valve nut 4 is used to seal the space between the lower end surface and the side surface of the valve ball gasket 3 and the groove 44.

[0038] In this embodiment, the valve ball gasket 3 is a POM gasket, and an O-ring is sleeved on the outer step of the valve ball gasket 3 to achieve double sealing effects on the end face and the side face, which improves the rotation feel of the ball valve and can compensate for the errors between the components, ensuring a stable and reliable sealing effect.

[0039] refer to Figure 8 and Fig. 9 In a specific embodiment, the valve ball gasket 3 adopts a traditional polytetrafluoroethylene gasket. Since the polytetrafluoroethylene material is relatively soft, it is preferably sealed with a sealing rib. The gasket sealing structure 6 includes an inner cavity sealing rib 13 and an installation groove sealing rib 41. The inner cavity sealing rib 13 is arranged on the inner cavity wall. The inner cavity sealing rib 13 is a circle of arc-shaped ribs distributed circumferentially. In order to improve the strength, the inner cavity sealing rib 13 is integrally formed with the inner cavity wall.

[0040] In the assembled state, the inner cavity sealing rib 13 presses against the top surface of the valve ball gasket 3, so that the upper end surface of the valve ball gasket 3 arranged at the front end is pressed and sealed by the inner cavity sealing rib 13. The inner cavity sealing rib 13 cooperates with the valve ball gasket 3, and when the valve ball gasket 3 is pressed outward by pressure, the inner cavity sealing rib 13 can effectively prevent the valve ball gasket 3 from loosening and displacement, and can enhance the sealing effect.

[0041] The gasket installation groove of the ball valve nut 4 is provided with an installation groove sealing rib 41, and the gasket installation groove and the installation groove sealing rib 41 are integrally formed to ensure the connection strength. In the assembled state, the installation groove sealing rib 41 presses against the top surface of the installation groove of the valve ball gasket 3 to compress and seal the lower end surface of the valve ball gasket 3 arranged at the rear end.

[0042] After the mounting groove sealing rib 41 is matched with the valve ball gasket 3, when the valve ball gasket 3 is pressed outwards under pressure, the mounting groove sealing rib 41 can effectively prevent the valve ball gasket 3 from loosening and displacement, and can enhance the sealing effect.

[0043] In this embodiment, the valve ball gasket 3 and the mounting groove sealing rib 41 cooperate to effectively prevent loosening and displacement and enhance the sealing effect when squeezed. Therefore, the valve ball gasket 3 is made of a more solid and reliable POM material to replace the traditional polytetrafluoroethylene gasket, which prevents the gasket from being subjected to external forces and reducing the sealing effect, enhances the sealing performance and reliable and stable performance, and improves the user experience.

[0044] The valve stem 5 and the valve ball 2 adopt an embedded installation structure. The valve stem 5 is provided with a valve stem boss 51, and the valve ball 2 is provided with a valve ball groove 21. The valve stem boss 51 is inserted into the valve ball groove 21, and the valve stem boss 51 is adapted to the valve ball groove 21 to achieve torque transmission.

[0045] The valve stem boss 51 may be, but is not limited to, a straight, cross, square, or hexagonal structure.

[0046] A hexagonal adapter surface 42 is provided above the internal thread of the ball valve nut 4. The hexagonal adapter surface 42 is adapted to a hexagonal wrench. The hexagonal wrench acts on the hexagonal adapter surface 42 to assist in tightening, thereby screwing the ball valve nut 4 onto the thread at the lower part of the inner cavity of the ball valve body 1.

[0047] The valve stem sealing structure 7 comprises at least two O-rings. All the O-rings are sleeved in the valve stem groove 52 and arranged along the axial direction. The valve stem 5 and the ball valve body 1 are sealed by the O-rings.

[0048] The ball valve nut sealing structure 8 is specifically an O-type sealing ring, which is arranged in the groove 44 of the ball valve nut 4 and seals the ball valve nut 4 through the O-type sealing ring.

[0049] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0050] The above is a detailed introduction to the ball valve structure with high sealing performance provided by the present application. This article uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A ball valve structure with high sealing performance, comprising a ball valve body (1), a valve ball (2) arranged in the inner cavity of the ball valve body (1), a valve ball gasket (3) arranged at the front and rear ends of the valve ball (2), a ball valve nut (4) threadedly connected to the internal thread of the ball valve body (1), and a valve stem (5) arranged in the inner hole (12) of the ball valve body (1), characterized in that: The end face and / or side face of the valve ball gasket (3) is sealed with the cavity wall of the inner cavity and the ball valve nut (4) via a gasket sealing structure (6); the valve stem (5) is sealed with the inner hole (12) via a valve stem sealing structure (7); and the ball valve nut (4) is sealed with the inner cavity of the ball valve body (1) via a ball valve nut sealing structure (8).

2. The ball valve structure with high sealing performance according to claim 1, characterized in that: The valve ball gasket (3) is specifically a POM gasket; The gasket sealing structure (6) includes at least two O-rings, and the outer peripheral surface of each valve ball gasket (3) is provided with a gasket installation groove (31). Each O-ring is arranged in a one-to-one correspondence in the gasket installation groove (31) of the corresponding valve ball gasket (3). The O-ring arranged in the inner cavity is used to seal the space between the upper end surface and the side surface of the valve ball gasket (3) and the inner cavity wall, and the O-ring arranged in the installation groove of the ball valve nut (4) is used to seal the space between the lower end surface and the side surface of the valve ball gasket (3) and the installation groove.

3. The ball valve structure with high sealing performance according to claim 1, characterized in that: The valve ball gasket (3) is specifically a polytetrafluoroethylene gasket; The gasket sealing structure (6) comprises an inner cavity sealing rib (13) and an installation groove sealing rib (41), wherein the inner cavity sealing rib (13) is arranged on the inner cavity wall to compress and seal the upper end surface of the valve ball gasket (3) arranged at the front end, and the installation groove sealing rib (41) is arranged at the bottom of the installation groove of the ball valve nut (4) to compress and seal the lower end surface of the valve ball gasket (3) arranged at the rear end.

4. The ball valve structure with high sealing performance according to any one of claims 1 to 3, characterized in that: The valve stem (5) is provided with a valve stem boss (51) adapted to fit into the valve ball groove (21).

5. The ball valve structure with high sealing performance according to claim 4, characterized in that: The valve stem boss (51) is in the shape of a straight line, a cross, a square, or a hexagon.

6. The ball valve structure with high sealing performance according to claim 1, characterized in that: An inner hexagonal adapting surface (42) for adapting to an inner hexagonal wrench is provided above the inner thread of the ball valve nut (4).

7. The ball valve structure with high sealing performance according to claim 1, characterized in that: The valve stem sealing structure (7) comprises at least two O-rings.

8. The ball valve structure with high sealing performance according to claim 1, characterized in that: The ball valve nut sealing structure (8) is specifically an O-type sealing ring.

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