Linear sealing self-cleaning track ball valve

Abstract

The utility model relates to the technical field of ball valves, in particular to a linear sealing self-cleaning track ball valve which comprises a valve body, an auxiliary valve body flange is installed outside the valve body, a support is fixedly arranged at the upper end of the valve body, an installation step is arranged inside the auxiliary valve body flange, and a valve seat is installed on the installation step. A valve seat pressing ring used for pressing the valve cover is arranged at the outer end of the valve seat, an upper valve rod is installed in the upper half portion of the auxiliary valve body flange and the support through bearings, a lower valve rod is installed in the lower half portion of the auxiliary valve body flange through bearings, and a sphere-like valve element assembly is installed in the auxiliary valve body flange. The ball-like valve element assembly scrapes the sealing face of the valve seat like a blade, impurities and crystals on the sealing face can be scraped off, and the self-cleaning effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, in particular to a line-sealed self-cleaning track ball valve. Background Art

[0002] The orbital ball valve uses the inclined surface at the bottom of the valve stem and the spiral groove to achieve the tilting and rotation of the ball. When the valve is opened, the ball tilts away from the valve seat, and the fluid in the pipeline passes through the valve evenly along the surface of the ball, reducing the local erosion and corrosion of the valve seat by the high-speed fluid. Finally, the ball rotates to the fully open position. When the valve is closed, the ball relies on the mechanical wedging force of the inclined surface of the valve stem to act on the valve seat, generating the required sealing pressure ratio to ensure reliable sealing. The sealing pressure ratio can be adjusted with the changes in fluid erosion, corrosion degree and working pressure, thereby extending the service life of the ball valve.

[0003] However, conventional track ball valves are generally sealed on one side. If there are slight impurities in the medium, the sealing surface may leak easily. For example, a Chinese patent with announcement number CN204900912U discloses a track ball valve, which includes a valve body, a valve cover connected to the valve body, a medium inlet channel, a medium outflow channel and a connecting cavity arranged on the valve body, a ball is arranged in the connecting cavity, a valve seat is arranged between the medium inlet channel or the medium outflow channel and the ball, a valve stem connected to the ball in linkage with the valve cover is arranged, a driving source for driving the valve stem is arranged at the other end of the valve stem relative to the end connected to the ball in linkage with the valve cover, a guide rod matching the valve stem is arranged on the valve cover, a slide groove for sliding the guide rod is arranged on the valve stem, a placement cavity for placing the guide rod and having an installation opening is opened on the valve cover, a bearing is sleeved on the outer circumference of the guide rod, a sealing cover is arranged at the installation opening of the valve cover, and a bearing lubrication mechanism is mounted on the sealing cover.

[0004] Although this track ball valve provides a track ball valve that is easy to open or close, has a long service life of the guide rod, and has a simple structure, this track ball valve is prone to the above-mentioned problems during long-term use. Utility Model Content

[0005] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the utility model is to provide a line-sealed self-cleaning track ball valve, which realizes two-way sealing of the track ball valve through a combined spherical valve core structure, making the sealing of the track ball valve more reliable. At the same time, the self-cleaning function also expands the application scenarios of the track ball valve.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A line-sealed self-cleaning track ball valve, characterized in that it comprises a valve body, an auxiliary valve body flange is installed on the outside of the valve body, a bracket is fixedly installed on the upper end of the valve body, a mounting step is provided inside the auxiliary valve body flange, a valve seat is installed on the mounting step, a valve seat pressing ring for pressing the valve cover is provided on the outer end of the valve seat, a lower valve stem is installed inside the lower half of the auxiliary valve body flange through a first bearing, and an upper valve stem is installed inside the upper half of the auxiliary valve body flange and the bracket through a second bearing;

[0008] A spherical valve core assembly is installed inside the auxiliary valve body flange, and the spherical valve core assembly is installed at a position between the upper valve stem and the lower valve stem. The spherical valve core assembly specifically includes a pair of valve cores, a spherical lower connecting block and a spherical upper connecting block. Limit blocks are fixedly installed between the valve cores, and the paired valve cores are installed on the spherical upper connecting block and the spherical lower connecting block. Protruding blade-type sealing blocks are provided at the upper and lower ends of the valve core, so that the contact surface between the valve core and the valve seat forms a self-cleaning sealing surface.

[0009] Furthermore, the lower connecting block of the sphere is fixed to the upper end of the lower valve stem, and the upper connecting block of the sphere is fixed to the lower end of the upper valve stem. The upper connecting block of the sphere and the lower connecting block of the sphere are both provided with sliding grooves that are mirror-symmetrical on the left and right. The paired valve cores are fixed with valve core connectors for connecting and assembling with the upper connecting block of the sphere and the lower connecting block of the sphere. The valve core connectors are installed in the sliding grooves, and the two groups of valve cores are respectively installed at the front and rear positions of the upper connecting block of the sphere and the lower connecting block of the sphere.

[0010] Furthermore, a valve seat groove is formed on the surface of the valve seat, and an O-ring is sleeved and installed in the valve seat groove.

[0011] Furthermore, a bottom flange sealedly connected to the valve body is provided at the lower end of the valve body, and a bottom flange gasket is pressed between the bottom flange and the valve body.

[0012] Furthermore, a sealing packing is pressed into the connection position between the valve body and the bracket, and a packing gland for compressing the sealing packing is installed on the upper part of the sealing packing.

[0013] Furthermore, a positioning bolt is fixedly provided on the outer side of the bracket, which passes through the upper valve stem transversely and is embedded in the upper valve stem. A limiting track is provided on the surface of the upper valve stem, and the positioning bolt is inserted into the limiting track of the upper valve stem. The lower end of the limiting track is a longitudinally arranged straight line stroke, and the upper end is a stroke extending obliquely upward along the rod wall of the upper valve stem.

[0014] Furthermore, a stem nut is installed on the outer side of the upper valve stem, the stem nut is placed on the upper end of the second bearing, a nut sleeve is installed on the upper end of the stem nut, the stem nut is tightened by the nut sleeve, and a handwheel is installed on the outer upper end of the stem nut.

[0015] In summary, the utility model has the following two significant beneficial effects:

[0016] ①Compared with the single-seal sealing method of conventional track ball valves, it has higher reliability and realizes bidirectional sealing of track ball valves through the combined ball valve core structure;

[0017] ②The special structural design of the valve core affects the way the sealing surface between the valve core and the valve seat is formed. When the valve core opens and closes, the impurities and crystals on the surface of the valve seat can be scraped off to achieve the self-cleaning effect of the track ball valve. The addition of this self-cleaning function not only does not cause the track ball valve to lose its sealing performance, but further improves the sealing effect and greatly increases its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application, but do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 It is a structural schematic diagram of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the valve stem track in the utility model;

[0021] Figure 3 It is a structural schematic diagram of the combined sphere in the utility model;

[0022] Figure 4 It is a schematic diagram of the sealing surface of the valve core and the valve seat in the utility model;

[0023] Figure 5 It is a structural schematic diagram of valve seat compensation in the utility model.

[0024] In the figure, 1, bottom flange; 2, bottom flange gasket; 3, first bearing; 31, limit track; 4, valve body; 41, valve core connector; 42, sliding groove; 5, auxiliary valve body flange; 51, blade-type sealing block; 6, lower valve stem; 62, O-ring; 7, valve seat pressure ring; 8, lower ball connecting block; 9, spring; 10, valve seat; 11, valve core; 12, upper ball connecting block; 13, middle flange gasket; 14, sealing packing; 15, packing gland; 16, upper valve stem; 17, positioning bolt; 18, bracket; 19, second bearing; 20, valve stem nut; 21, nut sleeve; 22, handwheel; 23, limit block. DETAILED DESCRIPTION

[0025] The above and other technical contents, features and functions of the present invention are described in detail below with reference to the attached Figure 1 To Attachment Figure 5 The detailed description of the embodiments will clearly show that the structural contents mentioned in the following embodiments are all based on the drawings in the specification.

[0026] Various exemplary embodiments of the present utility model will be described below with reference to the accompanying drawings. Example

[0027] A line-sealed self-cleaning track ball valve comprises a valve body 4, an auxiliary valve body flange 5 is installed on the outside of the valve body 4, a bracket 18 is fixed on the upper end of the valve body 4, a mounting step is provided inside the auxiliary valve body flange 5, a valve seat 10 is installed on the mounting step, a valve seat 10 is provided at the outer end of the valve seat 10 for pressing the valve cover, the valve seat pressure ring 7 is fixed to the auxiliary valve body flange 5 by bolts, and the valve seat 10 is squeezed and fixed by the structure of the valve seat pressure ring 7, a lower valve stem 6 is installed inside the lower half of the auxiliary valve body flange 5 through a first bearing 3, and an upper valve stem 16 is installed inside the upper half of the auxiliary valve body flange 5 and the bracket 18 through a second bearing 19.

[0028] A valve seat 10 groove is provided on the surface of the valve seat 10, and an O-ring 62 is sleeved and installed in the groove of the valve seat 10. A spring 9 is also embedded and installed at the bottom of the valve seat 10. One end of the spring 9 is pressed against the side wall of the auxiliary valve body flange 5, and the other end is pressed against the valve seat 10 in the opposite direction. When used in conjunction with the valve seat pressure ring 7, the two exert opposite forces on the valve seat 10 to ensure that the installation position of the valve seat 10 will not loosen, thereby improving the sealing performance.

[0029] A spherical valve core assembly is installed inside the auxiliary valve body flange 5. The spherical valve core assembly is installed at a position between the upper valve stem 16 and the lower valve stem 6. The spherical valve core assembly specifically includes a pair of valve cores 11, a spherical lower connecting block 8 and a spherical upper connecting block 12. The paired valve cores 11, the spherical lower connecting block 8 and the spherical upper connecting block 12 form a complete spherical structure. Limit blocks 23 are fixedly installed between the valve cores 11. The spacing of the limit blocks 23 needs to be adjusted according to the position of the valve cores 11. The paired valve cores 11 are installed on the spherical upper connecting block 12 and the spherical lower connecting block 8. Protruding blade-type sealing blocks 51 are provided at the upper and lower ends of the valve core 11, so that the contact surface between the valve core 11 and the valve seat 10 forms a self-cleaning sealing surface.

[0030] The lower connecting block 8 of the sphere is fixed to the upper end of the lower valve stem 6, and the upper connecting block 12 of the sphere is fixed to the lower end of the upper valve stem 16. The upper connecting block 12 of the sphere and the lower connecting block 8 of the sphere are both provided with sliding grooves 42 that are mirror-symmetrical on the left and right. The paired valve cores 11 are fixed with valve core connectors 41 for connecting and assembling with the upper connecting block 12 of the sphere and the lower connecting block 8 of the sphere. The valve core connectors 41 are installed in the sliding grooves 42. The two groups of valve cores 11 are respectively installed at the front and rear positions of the upper connecting block 12 of the sphere and the lower connecting block 8 of the sphere.

[0031] Install the prepared valve seat 10 on the auxiliary valve body flange 5, press the valve seat 10 with the valve seat pressure ring 7, install the auxiliary valve body flange 5 with accessories on the valve body 4 through standard parts, slide the spherical valve core assembly into and automatically position it to the center of the auxiliary valve body flange 5, rotate the valve stem to grind the valve core 11 and the valve seat 10 with a special tool to form a fitting sealing surface, and remove the limit block 23 to make the valve core 11 in the closed position.

[0032] A positioning bolt 17 is fixedly provided on the outer side of the bracket 18, which passes through the upper valve stem 16 transversely and is embedded in the upper valve stem 16. A limiting track 31 is provided on the surface of the upper valve stem 16, and the positioning bolt 17 is inserted into the limiting track 31 of the upper valve stem 16. The lower end of the limiting track 31 is a longitudinally arranged straight line stroke, and the upper end is a stroke extending obliquely upward along the rod wall of the upper valve stem 16.

[0033] The line-sealed self-cleaning track ball valve is provided with two sets of limit tracks 31 with different strokes for the valve core 11. When the valve stem is lifted, the valve core 11 is simultaneously retracted, so that the valve stem can immediately disengage from the sealing surface with a slight lift. The limit track 31 formed by the positioning bolt 17 at the bracket 18 and the valve stem actually makes the valve first have a straight stroke when opening, so that the valve core 11 disengages from the valve seat 10, and then has an angular stroke, so that the valve opens 90°. When the valve is opened and closed, the blade-type sealing block 51 on the outside of the valve core 11 scrapes across the sealing surface of the valve seat 10, so as to scrape off impurities and crystals on the sealing surface, thereby achieving a self-cleaning effect.

[0034] The lower end of the valve body 4 is provided with a bottom flange 1 sealed therewith, a bottom flange gasket 2 is pressed between the bottom flange 1 and the valve body 4, and the bottom flange gasket 2 is pressed by the bottom flange 1 to form a bottom seal.

[0035] A sealing packing 14 is pressed into the connection position between the valve body 4 and the bracket 18 , and a packing gland 15 for compressing the sealing packing 14 is installed on the upper part of the sealing packing 14 to form a valve stem seal.

[0036] A stem nut 20 is installed on the outer side of the upper valve stem 16. The stem nut 20 is placed on the upper end of the second bearing 19. A nut sleeve 21 is installed on the upper end of the stem nut 20. The stem nut 20 is tightened by the nut sleeve 21. A hand wheel 22 is installed on the outer side of the upper end of the stem nut 20.

[0037] The above is a further detailed description of the present invention in combination with a specific implementation method, and it cannot be determined that the specific implementation of the present invention is limited to this; for technical personnel in the field of the present invention and related technical fields, based on the technical solution of the present invention, the expansion and replacement of operating methods and data should all fall within the protection scope of the present invention.

Claims

1. A line-sealed self-cleaning track ball valve, characterized in that: The valve body comprises a valve body (4), an auxiliary valve body flange (5) is installed on the outside of the valve body (4), a bracket (18) is fixedly installed on the upper end of the valve body (4), a mounting step is provided inside the auxiliary valve body flange (5), a valve seat (10) is installed on the mounting step, a valve seat pressing ring (7) for pressing the valve cover is provided at the outer end of the valve seat (10), a lower valve stem (6) is installed inside the lower half of the auxiliary valve body flange (5) via a first bearing (3), and an upper valve stem (16) is installed inside the upper half of the auxiliary valve body flange (5) and the bracket (18) via a second bearing (19); A spherical valve core assembly is installed inside the auxiliary valve body flange (5). The spherical valve core assembly is installed between the upper valve stem (16) and the lower valve stem (6). The spherical valve core assembly specifically comprises a pair of valve cores (11), a spherical lower connecting block (8) and a spherical upper connecting block (12). A limit block (23) is fixedly installed between the valve cores (11). The paired valve cores (11) are installed on the spherical upper connecting block (12) and the spherical lower connecting block (8). The valve cores (11) are provided with protruding blade-type sealing blocks (51) at the upper and lower ends of the valve core (11), so that the contact surface between the valve core (11) and the valve seat (10) forms a self-cleaning sealing surface.

2. A wire-sealed self-cleaning track ball valve according to claim 1, characterized in that: The lower ball connection block (8) is fixed to the upper end of the lower valve stem (6), and the upper ball connection block (12) is fixed to the lower end of the upper valve stem (16). The upper ball connection block (12) and the lower ball connection block (8) are both provided with sliding grooves (42) that are mirror-symmetrical on the left and right. The paired valve cores (11) are fixed with valve core connectors (41) for connecting and assembling with the upper ball connection block (12) and the lower ball connection block (8). The valve core connectors (41) are installed in the sliding grooves (42). The two groups of valve cores (11) are respectively installed at the front and rear sides of the upper ball connection block (12) and the lower ball connection block (8).

3. A line-sealed self-cleaning track ball valve according to claim 2, characterized in that: A valve seat (10) groove is provided on the surface of the valve seat (10), and an O-ring (62) is sleeved and installed in the valve seat (10) groove.

4. A line-sealed self-cleaning track ball valve according to claim 2, characterized in that: The lower end of the valve body (4) is provided with a bottom flange (1) which is sealed therewith, and a bottom flange gasket (2) is pressed between the bottom flange (1) and the valve body (4).

5. A wire-sealed self-cleaning track ball valve according to claim 2, characterized in that: A sealing packing (14) is pressed into the connection position between the valve body (4) and the bracket (18), and a packing gland (15) for pressing the sealing packing (14) is installed on the upper part of the sealing packing (14).

6. A line-sealed self-cleaning track ball valve according to claim 2, characterized in that: A positioning bolt (17) is fixedly provided on the outer side of the bracket (18) and passes through the upper valve stem (16) transversely and is embedded in the interior of the upper valve stem (16). A limiting track (31) is provided on the surface of the upper valve stem (16). The positioning bolt (17) is inserted into the limiting track (31) of the upper valve stem (16). The lower end of the limiting track (31) is a longitudinally arranged straight line stroke, and the upper end is a stroke extending upwardly along the rod wall of the upper valve stem (16).

7. A wire-sealed self-cleaning track ball valve according to claim 2, characterized in that: A valve stem nut (20) is mounted on the outer side of the upper valve stem (16). The valve stem nut (20) is placed on the upper end of the second bearing (19). A nut pressing sleeve (21) is mounted on the upper end of the valve stem nut (20). The valve stem nut (20) is tightened by the nut pressing sleeve (21). A hand wheel (22) is mounted on the outer side of the upper end of the valve stem nut (20).

Images