Long-acting sealing floating ball valve

Abstract

The utility model provides a long-acting sealing floating type ball valve which aims at solving the technical problem that an annular valve seat of an existing floating type ball valve is prone to deformation and failure. According to the technical scheme, the long-acting sealing floating type ball valve comprises a valve body with a through valve cavity, a valve rod rotationally connected with the valve body, a ball body arranged in the valve cavity and an annular valve seat. The ball body is provided with a channel for communicating the inlet end and the outlet end of the valve cavity; the two annular valve seats are distributed at the inlet end and the outlet end of the valve cavity; the lower section of the valve rod is located in the valve cavity and provided with a limiting part. Limiting grooves are formed in the tops of the balls. The limiting groove and the limiting part form limiting fit; the limiting part can slide in the horizontal direction along the limiting groove; the limiting groove is provided with a loaded surface, and the limiting part is provided with a supporting surface for supporting the loaded surface. Deformation of the annular valve seat due to the fact that the ball body is pressed on the lower portion of the annular valve seat can be avoided, and long-term stable and effective sealing effect of the annular valve seat is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a floating ball valve with long-term sealing. Background Art

[0002] The ball valve uses a ball with a circular through hole as the opening and closing part; driven by the valve stem, the ball rotates 0 to 90 degrees around the center of the valve stem to complete the opening and closing function. According to the different installation methods of the ball, the ball valve can be divided into a fixed ball valve and a floating ball valve. The main difference is that the fixed ball valve has the ball fixedly installed on the valve stem, while the floating ball valve has the ball slightly floating in the valve cavity.

[0003] The existing floating ball valve generally supports the floating ball through the annular valve seats on the left and right sides of the ball. Normally, under the action of gravity, the ball will sink spontaneously and press on the lower part of the annular valve seat; over time, the sealing surface at the lower part of the annular valve seat will deform, causing the ball to move downward, and then causing the sealing surface at the upper part of the annular valve seat to fail. Summary of the invention

[0004] The utility model aims to provide a long-term sealed floating ball valve, which can avoid the deformation of the annular valve seat caused by the ball pressing on the lower part of the annular valve seat, ensure the long-term stable and effective sealing effect of the annular valve seat, and has the advantages of simple structure and easy production and processing.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A floating ball valve with long-term sealing comprises: a valve body having a valve cavity passing through, a valve stem rotatably connected to the valve body, a sphere arranged in the valve cavity and an annular valve seat; wherein the sphere has a channel to connect the inlet end and the outlet end of the valve cavity; two annular valve seats are provided, distributed at the inlet end and the outlet end of the valve cavity; the lower section of the valve stem is located in the valve cavity and has a limiting portion; the top of the sphere has a limiting groove; the limiting groove and the limiting portion form a limiting cooperation so that when the valve stem rotates, the sphere is driven to rotate and the on-off state of the channel and the inlet end and the outlet end is switched; the limiting portion can slide in the horizontal direction along the limiting groove so that when the sphere is subjected to medium pressure, it forms a sealing cooperation with the annular valve seat; the limiting groove has a load-bearing surface, and the limiting portion has a supporting surface that supports the load-bearing surface.

[0007] Optionally, the limiting groove extends in the horizontal direction and is a through groove; the length direction of the valve stem is perpendicular to the length direction of the channel and the length direction of the limiting groove.

[0008] Optionally, the limiting groove is provided with a first planar groove on the side; the first planar groove extends along the length direction of the limiting groove and is a through groove; the upper side surface of the first planar groove constitutes a load-bearing surface.

[0009] Optionally, the valve stem is provided with a second planar groove on the circumferential surface of the lower section; the second planar groove extends in the horizontal direction and is a through groove; the lower side surface of the second planar groove constitutes a supporting surface.

[0010] Optionally, the side surface of the limiting groove constitutes a first limiting surface, and the bottom surface of the second planar groove constitutes a second limiting surface; the first limiting surface and the second limiting surface form a limiting fit, so that the limiting groove and the limiting portion form a limiting fit.

[0011] Optionally, the limiting groove is provided with first planar grooves on the sides of both sides, and the valve stem is provided with second planar grooves on both sides; the first planar groove corresponds to the second planar groove one by one.

[0012] Optionally, the limiting groove is provided with a plurality of first planar grooves in the up-down direction, and the valve stem is provided with a plurality of second planar grooves in the up-down direction; the first planar grooves correspond one to one with the second planar grooves.

[0013] Optionally, the limiting groove is configured as a dovetail groove, and the limiting portion is correspondingly configured as a dovetail tenon; the side surface of the limiting groove and the side surface of the limiting portion constitute a limiting fit; and the side surface of the limiting groove constitutes a load-bearing surface, and the side surface of the limiting portion constitutes a supporting surface.

[0014] Optionally, a groove is provided at the bottom end of the valve stem, and a spring is installed in the groove; the spring is made of a conductor.

[0015] Compared with the prior art, the beneficial effects of the utility model are mainly embodied in:

[0016] 1. The valve stem supports the load-bearing surface of the limit groove of the ball through the supporting surface of its limit part; it can prevent the ball from being pressed on the lower part of the annular valve seat due to its own gravity, thereby preventing the sealing surface of the annular valve seat from deformation or failure, thereby ensuring the long-term stable and effective sealing effect of the annular valve seat.

[0017] 2. Compared with the internal processing to process a support platform in the valve body to play a similar role, the utility model sets a limit part at the lower section of the valve stem and a limit groove at the top of the sphere, which can be completed by external processing, which is more convenient in production and processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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 description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a cross-sectional schematic diagram of the utility model;

[0020] Figure 2 It is a schematic diagram of the first structure of the valve stem and the ball;

[0021] Figure 3 for Figure 2 A front view of

[0022] Figure 4 It is a schematic diagram of the second structure of the valve stem and the ball;

[0023] Figure 5 It is a schematic diagram of the third structure of the valve stem and the ball;

[0024] Figure 6 It is a schematic diagram of the fourth structure of the valve stem and the ball;

[0025] Figure numerals: 1. valve body; 2. valve stem; 3. sphere; 4. annular valve seat; 5. channel; 6. inlet end; 7. outlet end; 8. limit groove; 9. load-bearing surface; 10. supporting surface; 11. first plane groove; 12. second plane groove; 13. first limit surface; 14. second limit surface; 15. spring. DETAILED DESCRIPTION

[0026] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0027] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0030] The following is combined with Figure 1 ~Attached Figure 6 The embodiments of the present utility model are described in detail.

[0031] The embodiment of the utility model provides a floating ball valve with long-term sealing. The floating ball valve comprises: a valve body 1 having a valve cavity, a valve stem 2 rotatably connected to the valve body 1, a ball 3 disposed in the valve cavity, and an annular valve seat 4. The ball 3 has a channel 5 to connect the inlet end 6 and the outlet end 7 of the valve cavity. Two annular valve seats 4 are provided, distributed at the inlet end 6 and the outlet end 7 of the valve cavity. The lower section of the valve stem 2 is located in the valve cavity and has a limiting portion. The top of the ball 3 has a limiting groove 8. The limiting groove 8 and the limiting portion form a limiting match, so that when the valve stem 2 rotates, the ball 3 is driven to rotate, and the on-off state of the channel 5 and the inlet end 6 and the outlet end 7 is switched. The limiting portion can slide in the horizontal direction along the limiting groove 8, so that when the ball 3 is subjected to the medium pressure, it forms a sealing match with the annular valve seat 4. The limiting groove 8 has a load-bearing surface 9, and the limiting portion has a supporting surface 10 that supports the load-bearing surface 9.

[0032] The specific implementation of the present invention is described below: the valve stem 2 supports the load-bearing surface 9 of the limiting groove 8 of the ball 3 through the support surface 10 of its limiting portion; the ball 3 can be prevented from being pressed on the lower part of the annular valve seat 4 due to its own gravity, thereby preventing the sealing surface of the annular valve seat 4 from being deformed or failing, thereby ensuring that the sealing effect of the annular valve seat 4 is stable and effective for a long time. Compared with the internal processing, a support platform is processed in the valve body 1 to play a similar role. The present invention sets a limiting portion at the lower section of the valve stem 2 and a limiting groove 8 at the top of the ball 3, which can be completed by external processing, which will be more convenient during production and processing.

[0033] Furthermore, the limiting groove 8 extends in the horizontal direction and is a through groove; the length direction of the valve stem 2 is perpendicular to the length direction of the channel 5 and the length direction of the limiting groove 8. It should be understood that when the channel 5 is disconnected from the inlet end 6 and the outlet end 7 of the valve cavity, the length direction of the limiting groove 8 corresponds to the direction from the inlet end 6 to the outlet end 7; at this time, the limiting groove 8 of the ball 3 can slide toward the outlet end 7 relative to the limiting part, so that the ball 3 cooperates with the annular valve seat 4 to form a seal. When the channel 5 connects the inlet end 6 and the outlet end 7 of the valve cavity, the length direction of the limiting groove 8 is perpendicular to the direction from the inlet end 6 to the outlet end 7, and the limiting part will limit the limiting groove 8; at this time, the ball 3 cannot slide toward the outlet end 7, and a small gap will be left between the ball 3 and the annular valve seat 4, which can avoid the friction between the ball 3 and the annular valve seat 4 due to floating in the connected state, thereby further protecting the annular valve seat 4.

[0034] Furthermore, the limiting groove 8 is provided with a first plane groove 11 on the side thereof; the first plane groove 11 extends along the length direction of the limiting groove 8 and is a through groove; the upper side surface of the first plane groove 11 constitutes the load-bearing surface 9 .

[0035] Furthermore, the valve stem 2 is provided with a second plane groove 12 on the circumference of the lower section; the second plane groove 12 extends in the horizontal direction and is a through groove; the lower side of the second plane groove 12 constitutes a support surface 10. It should be understood that the assembly of the valve stem 2 and the ball 3 can be completed by pushing the lower section of the valve stem 2 into the limiting groove 8 of the ball 3.

[0036] Further, the side surface of the limiting groove 8 constitutes a first limiting surface 13, and the bottom surface of the second plane groove 12 constitutes a second limiting surface 14; the first limiting surface 13 and the second limiting surface 14 constitute a limiting fit, so that the limiting groove 8 and the limiting portion constitute a limiting fit. It should be understood that the limiting fit of the first limiting surface 13 and the second limiting surface 14 can not only prevent the ball 3 from rotating relative to the valve stem 2, but also prevent the ball 3 from moving relative to the valve stem 2 along the width direction of the limiting groove 8.

[0037] Further, the limiting groove 8 is provided with first planar grooves 11 on both sides of the side, and the valve stem 2 is provided with second planar grooves 12 on both sides; the first planar grooves 11 correspond to the second planar grooves 12. It should be understood that the first planar grooves 11 are provided on both sides of the limiting groove 8, and the second planar grooves 12 are provided on both sides of the valve stem 2, so that the cooperation between the valve stem 2 and the ball 3 can be more stable.

[0038] Furthermore, the limit groove 8 is provided with a plurality of first plane grooves 11 in the vertical direction, and the valve stem 2 is provided with a plurality of second plane grooves 12 in the vertical direction; the first plane grooves 11 correspond to the second plane grooves 12 one by one. It should be understood that by providing a plurality of first plane grooves 11 in sequence from top to bottom in the limit groove 8, the load-bearing surfaces 9 of each first plane groove 11 can share the wear caused by the sliding of the ball 3; by providing a plurality of second plane grooves 12 in sequence from top to bottom in the valve stem 2, the support surfaces 10 of each second plane groove 12 can share the wear caused by the sliding of the ball 3; in this way, the service life of the load-bearing surface 9 and the support surface 10 can be extended.

[0039] Further, the limiting groove 8 is configured as a dovetail groove, and the limiting portion is correspondingly configured as a dovetail tenon; the side surface of the limiting groove 8 and the side surface of the limiting portion form a limiting fit; and the side surface of the limiting groove 8 constitutes a load-bearing surface 9, and the side surface of the limiting portion constitutes a supporting surface 10. It should be understood that when the limiting groove 8 is configured as a dovetail groove, its side surface is an inclined surface, which can play the role of both the load-bearing surface 9 and the first limiting surface 13; correspondingly, the limiting portion is configured as a dovetail tenon, and its side surface is an inclined surface, which can play the role of both the supporting surface 10 and the second limiting surface 14.

[0040] Furthermore, a groove is provided at the bottom end of the valve stem 2, and a spring 15 is installed in the groove; the spring 15 is made of a conductor. It should be understood that the spring 15 is usually made of metal, which can ensure that the ball 3 is in contact with the valve stem 2, thereby conducting static electricity of the ball 3.

[0041] Although specific embodiments of the present invention are described above, those skilled in the art should understand that various changes or modifications may be made to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications are all within the scope of protection of the present invention.

Claims

1. Long-term sealing floating ball valve, characterized by: include: A valve body (1) having a through valve cavity; and a valve stem (2) rotatably connected to the valve body (1); and A spherical body (3) and an annular valve seat (4) disposed in the valve cavity; in, The sphere (3) has a channel (5) for connecting the inlet end (6) and the outlet end (7) of the valve cavity; The annular valve seats (4) are provided with two, which are distributed at the inlet end (6) and the outlet end (7) of the valve cavity; The lower section of the valve stem (2) is located in the valve cavity and has a limiting portion; The top of the sphere (3) is provided with a limiting groove (8); The limiting groove (8) and the limiting portion form a limiting cooperation, so that when the valve stem (2) rotates, the ball (3) is driven to rotate, thereby switching the on / off state of the channel (5) and the inlet end (6) and the outlet end (7); The limiting portion can slide in the horizontal direction along the limiting groove (8), so that when the ball (3) is subjected to medium pressure, it forms a sealing fit with the annular valve seat (4); The limiting groove (8) has a load-bearing surface (9), and the limiting portion has a supporting surface (10) that supports the load-bearing surface (9).

2. The long-term sealing floating ball valve according to claim 1 is characterized in that: The limiting groove (8) extends in the horizontal direction and is a through groove; The length direction of the valve stem (2) is perpendicular to the length direction of the channel (5) and the length direction of the limiting groove (8).

3. The floating ball valve with long-term sealing according to claim 2 is characterized in that: The limiting groove (8) is provided with a first plane groove (11) on the side surface; The first planar groove (11) extends along the length direction of the limiting groove (8) and is a through groove; The upper side surface of the first planar groove (11) forms a load-bearing surface (9).

4. The floating ball valve with long-term sealing according to claim 3 is characterized in that: The valve stem (2) is provided with a second plane groove (12) on the circumferential surface of the lower section; The second planar groove (12) extends in the horizontal direction and is a through groove; The lower side surface of the second planar groove (12) forms a supporting surface (10).

5. The floating ball valve with long-term sealing according to claim 4 is characterized in that: The side surface of the limiting groove (8) forms a first limiting surface (13), and the bottom surface of the second planar groove (12) forms a second limiting surface (14); The first limiting surface (13) and the second limiting surface (14) form a limiting fit, so that the limiting groove (8) and the limiting portion form a limiting fit.

6. The floating ball valve with long-term sealing according to any one of claims 3 to 5, characterized in that: The limiting groove (8) is provided with first planar grooves (11) on both sides of the side surfaces, and the valve stem (2) is provided with second planar grooves (12) on both sides; the first planar grooves (11) correspond to the second planar grooves (12) in a one-to-one manner.

7. The floating ball valve with long-term sealing according to any one of claims 3 to 5, characterized in that: The limiting groove (8) is provided with a plurality of first plane grooves (11) in the up-down direction, and the valve stem (2) is provided with a plurality of second plane grooves (12) in the up-down direction; the first plane grooves (11) correspond to the second plane grooves (12) in a one-to-one manner.

8. The floating ball valve with long-term sealing according to claim 1 or 2, characterized in that: The limiting groove (8) is configured as a dovetail groove, and the limiting portion is correspondingly configured as a dovetail tenon shape; The side surface of the limiting groove (8) and the side surface of the limiting portion form a limiting fit; the side surface of the limiting groove (8) forms a load-bearing surface (9), and the side surface of the limiting portion forms a supporting surface (10).

9. The floating ball valve with long-term sealing according to claim 1 or 2, characterized in that: The bottom end of the valve stem (2) is provided with a groove, and a spring (15) is installed in the groove; the spring (15) is made of a conductor.

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