Novel hard sealing floating ball valve

Abstract

The utility model discloses a novel hard sealing floating ball valve which comprises a left half valve body and a right half valve body, a valve element installation hole is formed in the right half valve body, a valve element is arranged in the valve element installation hole, valve seats are arranged on the left half valve body and the right half valve body, first metal sealing rings are arranged on the opposite faces of the two valve seats, and compression springs are arranged at the side ends of the two valve seats. A second metal sealing ring is arranged at the left end of the right half valve body, a valve sleeve is welded to the right half valve body, a valve rod is matched with the valve sleeve, annular grooves are formed in the top and the bottom of a valve element, supporting flat plates are arranged on the left half valve body and the right half valve body, a universal coupler is arranged at the bottom end of the valve rod, a column block is arranged in the center of the top end of the valve element, and a square hole is formed in the column block. The top end of the universal coupling is fixed to the bottom face of the valve rod, and a square block is fixed to the bottom end of the universal coupling. The valve element can be pressed on the first metal sealing ring on the pressed side in a floating mode, the medium leakage prevention effect is better under the high-pressure medium application environment, and the valve element is worthy of application and popularization.

Description

Technical Field

[0001] The utility model relates to a valve, in particular to a floating ball valve, and more particularly to a new type of hard-sealed floating ball valve. Background Art

[0002] A floating ball valve means that the valve core is floating. When the valve core is closing, under the action of the medium pressure, the valve core can generate a certain displacement offset and press tightly on the sealing surface at the outlet end to ensure the sealing at the outlet end. However, in the current floating ball valve, since the valve stem and the valve core are in plug-in fit and the valve core has no longitudinal support, under the action of the high-pressure medium force, the valve core is tilted and presses on the sealing ring at the outlet end. Although it can achieve a better sealing effect, when operating the valve core to open and close with the valve stem, since the valve stem is driven by the valve core and presents a bent shape, the valve stem rotates very tightly and is extremely difficult to drive. Moreover, even if the valve stem is rotated and driven, since the valve core is tilted and pressed at the sealing ring at the outlet end, the resistance for the valve core to be driven to rotate is very large, and it will cause the lower half of the sealing ring at the outlet end to be under too much medium pressure, resulting in excessive friction and too fast wear of the sealing ring at the outlet end. It is necessary to often close the pipeline to replace and maintain the sealing ring, which greatly increases the use cost.

[0003] Chinese Utility Model Patent CN 202327198 U discloses a floating ball valve. The floating ball valve includes a valve body, a valve cover, a ball and a valve stem. The valve body is connected to the valve cover. The bottom of the valve stem is connected to the ball. A valve seat is provided inside the valve body. The ball is adapted to the valve seat. A ball through hole is provided on the ball corresponding to the connection with the valve stem. The valve stem and the valve core of this floating ball valve are inserted together, and the bottom of the valve core has no support. Therefore, when the floating ball valve is closed, the valve core is tilted and pressed on the sealing surface at the outlet end. Not only is the resistance large when the floating ball valve is opened, but also the sealing ring at the outlet end wears too fast, and it is necessary to often close the pipeline for replacement and maintenance, which greatly increases the use cost of the ball valve. Summary of the Utility Model

[0004] The utility model aims to solve the above-mentioned drawbacks of the prior art and provides a new type of hard-sealed floating ball valve with a laterally floating valve core, metal hard seal, and longitudinal support for the valve core. It can not only withstand high-pressure media but also operate normally for high-temperature or low-temperature media, meeting the requirements of good sealing performance, low maintenance cost, and safe use of high-temperature or low-temperature media.

[0005] The technical solution adopted by the utility model to solve its technical problems: This new type of hard-sealed floating ball valve includes a left half valve body and a right half valve body. A valve core installation hole is provided in the right half valve body, and a valve core is arranged in the valve core installation hole. Valve seats are inserted on both the left half valve body and the right half valve body. First metal sealing rings are provided on the opposite surfaces of the two valve seats. Compression springs that drive the two valve seats to press towards the spherical surface of the valve core are installed at the side ends of the two valve seats. A second metal sealing ring is fixed at the left end of the right half valve body. The right end of the left half valve body is pressed against the second metal sealing ring, and the left half valve body and the right half valve body are fixed together by fasteners. A valve sleeve is welded and fixed on the right half valve body, and a valve stem is fitted on the valve sleeve. Circular grooves are provided at the top and bottom of the valve core. Support plates that are inserted and matched with the circular grooves are fixed on the upper and lower sides of the right end of the left half valve body and the upper and lower sides of the left end of the right half valve body. A universal coupling is provided at the bottom end of the valve stem. A column block is fixed at the center of the top end of the valve core. A square hole is provided at the top end of the column block. The top end of the universal coupling is fixed on the bottom surface of the valve stem, and the bottom end of the universal coupling is fixed with a square block that is matched with the square hole. The function of the valve core here is to open and close the flow channel; the functions of the valve seat, the first metal sealing ring, and the compression spring here are to be able to seal the valve core, avoid wear of the first metal sealing ring, be able to supplement the position when the first metal sealing ring is worn, increase the service life of the first metal sealing ring, and the first metal sealing ring can be used in a medium environment of high temperature or low temperature. The compression spring can make the first metal sealing ring move along with the valve core when the valve core floats, thus avoiding the problem that the first metal sealing ring at the outlet end is strongly squeezed and causes the first metal sealing ring to wear too fast; the functions of the valve stem, the universal coupling, the square hole, and the square block here are that during the process of the valve core being fully opened or fully closed, the valve core can float due to the impact of the medium, and the valve stem rotates to drive the valve core to rotate through the force transmission of the universal coupling that moves axially; the functions of the circular groove and the support plate here are that when the valve core is subjected to the medium pressure, the valve core can float horizontally through the support plate, thereby reducing the situation that the strong extrusion wear of the lower half part of the first metal sealing ring at the outlet end caused by the gravity of the valve core is too fast; the function of the second metal sealing ring here is to be used for the seal between the left half valve body and the right half valve body; both the first metal sealing ring and the second metal sealing ring are made of cobalt-based alloy materials or other similar performance materials. This material is not only resistant to high temperature or low temperature, but also wear-resistant, and can greatly increase the service life of the ball valve.

[0006] For further improvement, self-lubricating layers are provided on the surfaces of both circular grooves. The function of the self-lubricating layer here is that when the valve core moves on the support plate through the circular groove, the frictional resistance is small, and the valve core floats more smoothly; the self-lubricating layer is made of tin bronze material.

[0007] Further improvement is made. A cylinder is fixedly installed at the center of the bottom end of the valve core. A circular track groove is opened at the bottom of the cylinder. A set of ball bearings is installed in the circular track groove. A cage for limiting the ball bearings at the circular track groove is fixedly installed on the cylinder. The ball bearings are placed on the bottom end of the valve core installation hole. The functions of the cylinder, the circular track groove, the ball bearings, and the cage are as follows: they can longitudinally support the valve core, avoid bending the support flat plate, and have a good longitudinal support effect on heavy and large valve cores.

[0008] Further improvement is made. An installation seat is fixedly installed at the top end of the valve sleeve. A limiting rod is fixedly installed on the valve stem. An arc-shaped limiting groove that cooperates with the limiting rod and is used for full-open and full-close limiting of the valve core is opened on the installation seat. The functions of the installation seat, the limiting rod, and the arc-shaped limiting groove are such that the valve core can accurately be in the full-open and full-close states, avoiding the situation where the valve core rotates too much or too little.

[0009] Further improvement is made. A speed reducer is fixedly installed at the top end of the installation seat. The input shaft of the speed reducer is fixedly connected with the valve stem, and the output shaft of the speed reducer is fixedly installed on the runner. The functions of the speed reducer and the runner are as follows: they can rotate the valve stem easily and labor-savingly, so as to open and close the valve core easily and labor-savingly.

[0010] Further improvement is made. Dovetail grooves are opened on both the left half valve body and the right half valve body. Dovetail blocks that cooperate with the dovetail grooves are fixedly installed at the side ends of the two valve seats. An O-ring that cooperates with the dovetail blocks is installed on the left half valve body and the right half valve body. The functions of the dovetail groove, the dovetail block, and the O-ring are as follows: they can prevent the medium from contacting the compression spring, thus avoiding the problem that the compression spring is corroded and its service life is reduced.

[0011] Further improvement is made. A first self-lubricating layer is provided on the outer contour surfaces of the two valve seats, and a second self-lubricating layer is provided on the outer contour surface of the dovetail block. The function of the first self-lubricating layer is to make the valve seat move more smoothly and avoid jamming; the first self-lubricating layer is made of tin bronze material; the function of the second self-lubricating layer is to make the dovetail block area move more smoothly and avoid jamming; the second self-lubricating layer is made of tin bronze material.

[0012] The beneficial effects of the present utility model are as follows:

[0013] 1). It can enable the valve core to laterally float in a high-pressure medium environment, so as to press on the first metal sealing ring at the outlet end. The greater the medium pressure, the better the sealing effect.

[0014] 2). It can be applied in medium environments with high temperature, low temperature, and high pressure.

[0015] 2) It can longitudinally support the valve core, thus having a good longitudinal support effect on the valve core with large weight and volume. As a result, the valve core can float horizontally, so that the load on the first metal sealing ring at the outlet end is small, and the service life of the first metal sealing ring is longer. Brief Description of the Drawings

[0016] Figure 1 is a schematic structural view of the present utility model;

[0017] Figure 2 is Figure 1 a partially enlarged view of area A of

[0018] Figure 3 is a schematic structural view of the square block area in the present utility model;

[0019] Figure 4 is Figure 1 a partially enlarged view of area B of

[0020] Figure 5 is a schematic structural view of the cylindrical area in the present utility model;

[0021] Figure 6 is Figure 1 a schematic cross-sectional view taken along line C-C of

[0022] Description of the Reference Numerals: left half valve body 1, right half valve body 2, valve core mounting hole 2-1, valve core 3, circular ring groove 3-1, first self-lubricating layer 3-1a, columnar block 3-2, square hole 3-2a, cylinder 3-3, valve seat 4, dovetail block 4-1, second self-lubricating layer 4-1a, first self-lubricating layer 4-2, first metal sealing ring 5, compression spring 6, second metal sealing ring 7, valve sleeve 8, valve rod 9, support flat plate 10, universal coupling 11, square block 11-1, ball 12, cage 13, mounting seat 14, arc limiting groove 14-1, speed reducer 15, runner 16, dovetail groove 17, O-ring 18, limiting rod 19. Detailed Description of the Preferred Embodiments

[0023] The present utility model will be further described below with reference to the drawings:

[0024] Referring to the attached drawings: This new type of hard-sealed floating ball valve includes a left half valve body 1 and a right half valve body 2. A valve core installation hole 2-1 is provided in the right half valve body 2, and a valve core 3 is arranged in the valve core installation hole 2-1. Valve seats 4 are inserted on both the left half valve body 1 and the right half valve body 2. First metal sealing rings 5 are provided on the opposite surfaces of the two valve seats 4. Compression springs 6 for pressing the two valve seats 4 towards the spherical surface direction of the valve core 3 are installed at the side ends of the two valve seats 4. A second metal sealing ring 7 is fixed at the left end of the right half valve body 2. The right end of the left half valve body 1 is pressed against the second metal sealing ring 7, and the left half valve body 1 and the right half valve body 2 are fixed together by fasteners. A valve sleeve 8 is welded and fixed on the right half valve body 2. A valve stem 9 is matched with the valve sleeve 8. Circular grooves 3-1 are provided at the top and bottom of the valve core 3. Support flat plates 10 inserted and matched with the circular grooves 3-1 are fixed on the upper and lower sides of the right end of the left half valve body 1 and the upper and lower sides of the left end of the right half valve body 2. A universal coupling 11 is provided at the bottom end of the valve stem 9. A column block 3-2 is fixed at the center of the top end of the valve core 3. A square hole 3-2a is provided at the top end of the column block 3-2. The top end of the universal coupling 11 is fixed on the bottom surface of the valve stem 9, and the bottom end of the universal coupling 11 is fixed with a square block 11-1 matched with the square hole 3-2a.

[0025] Self-lubricating layers 3-1a are provided on the surfaces of the two circular grooves 3-1.

[0026] A cylinder 3-3 is fixed at the center of the bottom end of the valve core 3. A circular track groove 3-3a is provided at the bottom of the cylinder 3-3. A group of balls 12 are installed in the circular track groove 3-3a. A cage 13 for limiting the balls 12 at the circular track groove 3-3a is fixed on the cylinder 3-3. The balls 12 are placed on the bottom end of the valve core installation hole 2-1.

[0027] An installation seat 14 is fixed at the top end of the valve sleeve 8. A limit rod 19 is fixed on the valve stem 9. An arc limit groove 14-1 matched with the limit rod 19 and used for full-open limit and full-close limit of the valve core 3 is provided on the installation seat 14.

[0028] A speed reducer 15 is fixed at the top end of the installation seat 14. The input shaft of the speed reducer 15 is fixed together with the valve stem 9, and the output shaft of the speed reducer 15 is fixed to a runner 16.

[0029] Dovetail grooves 17 are provided on both the left half valve body 1 and the right half valve body 2. Dovetail blocks 4-1 matched with the dovetail grooves 17 are fixed at the side ends of the two valve seats 3. O-ring seals 18 matched with the dovetail blocks 4-1 are installed on the left half valve body 1 and the right half valve body 2.

[0030] First self-lubricating layers 4-2 are provided on the outer contour surfaces of the two valve seats 4, and a second self-lubricating layer 4-1a is provided on the outer contour surface of the dovetail block 4-1.

[0031] Working principle of the utility model: When the valve core 3 of the ball valve is in the closed state, the medium pressure will impact the valve core 3, causing the valve core 3 to press towards the direction of the first metal sealing ring 5 on the pressure-receiving side of the outlet end (the universal coupling 11 will bend at an angle as the valve core 3 offsets, but it does not affect the force transmission of the universal coupling 11). As a result, the valve core 3 moves horizontally and is synchronously guided by the support flat plate 10 and the ball 12, enabling the valve core 3 to move horizontally stably and press against the first metal sealing ring 5 at the outlet end. Unlike traditional floating ball valves, it does not press obliquely against the first metal sealing ring 5 at the outlet end. This makes the floating ball valve of the utility model not only have a good anti-leakage effect but also a longer service life of the first metal sealing ring 5. When the floating ball valve needs to be in the open state, only need to rotate the turntable 16, which drives the valve stem 9 to rotate. The rotation stops when the limit rod 19 rotates to the end of the arc-shaped limit groove 14-1 (as Figure 6 shown). At this time, the rotational torque generated by the rotation of the valve stem 9 drives the valve core 3 to rotate through the universal coupling 111, thus achieving the closing function of the floating ball valve. Since the first metal sealing ring 5 is installed on the valve seat 4 that can move horizontally, when the valve core 3 rotates, the first metal sealing ring 5 at the outlet end will float slightly due to the frictional force, avoiding the situation where excessive frictional force acts on the first metal sealing ring 5 and causing it to wear too quickly. Moreover, the spherical surface of the valve core 3 acts evenly horizontally on the first metal sealing ring 5 at the outlet end, so the wear of the first metal sealing ring 5 at the outlet end is small, the service life is longer, the sealing performance and anti-leakage ability are better, it can be applied to the medium working conditions of high temperature, low temperature, and high pressure, and the versatility is stronger, which is worthy of popularization and application.

[0032] Although the present utility model has been illustrated and described by reference to the preferred embodiments, those of ordinary skill in the art should understand that various changes in form and details can be made within the scope of the claims.

Claims

1. A new type of hard-sealed floating ball valve, comprising a left half valve body (1) and a right half valve body (2), characterized in that: A spool mounting hole (2-1) is formed in the right half valve body (2). A spool (3) is arranged in the spool mounting hole (2-1). Valve seats (4) are inserted into both the left half valve body (1) and the right half valve body (2). First metal sealing rings (5) are provided on the opposite surfaces of the two valve seats (4). Compression springs (6) for pressing the two valve seats (4) towards the spherical surface direction of the spool (3) are installed at the side ends of the two valve seats (4). A second metal sealing ring (7) is fixed to the left end of the right half valve body (2). The right end of the left half valve body (1) is pressed against the second metal sealing ring (7), and the left half valve body (1) and the right half valve body (2) are fixed together by fasteners. A valve sleeve (8) is fixedly welded to the right half valve body (2). A valve rod (9) is fitted on the valve sleeve (8). Circular groove (3-1) are formed at the top and bottom of the spool (3). Support flats (10) inserted and fitted with the circular groove (3-1) are fixed to the upper and lower sides of the right end of the left half valve body (1) and the upper and lower sides of the left end of the right half valve body (2). A universal coupling (11) is provided at the bottom end of the valve rod (9). A column block (3-2) is fixedly provided at the center of the top end of the spool (3). A square hole (3-2a) is formed at the top of the column block (3-2). The top end of the universal coupling (11) is fixed to the bottom surface of the valve rod (9), and the bottom end of the universal coupling (11) is fixed with a square block (11-1) fitted with the square hole (3-2a).

2. The novel hard-sealed floating ball valve according to claim 1, characterized in that: Self-lubricating layers (3-1a) are provided on the surfaces of the two circular grooves (3-1).

3. The novel hard-sealed floating ball valve according to claim 1 is characterized in that: A cylinder (3-3) is fixedly provided at the center of the bottom end of the spool (3). A circular track groove (3-3a) is formed at the bottom of the cylinder (3-3). A set of balls (12) are installed in the circular track groove (3-3a). A cage (13) for limiting the balls (12) at the circular track groove (3-3a) is fixed to the cylinder (3-3). The balls (12) rest on the bottom end of the spool mounting hole (2-1).

4. A new type of hard-sealed floating ball valve according to claim 1, characterized in that: A mounting seat (14) is fixed to the top end of the valve sleeve (8). A limiting rod (19) is fixed to the valve rod (9). An arc limiting groove (14-1) fitted with the limiting rod (19) and used for full-open limit and full-close limit of the spool (3) is formed in the mounting seat (14).

5. A new type of hard-sealed floating ball valve according to claim 4, characterized in that: A speed reducer (15) is fixed to the top end of the mounting seat (14). The input shaft of the speed reducer (15) is fixed together with the valve rod (9), and the output shaft of the speed reducer (15) is fixed to a runner (16).

6. A new type of hard-sealed floating ball valve according to claim 1, characterized in that: Dovetail grooves (17) are formed in both the left half valve body (1) and the right half valve body (2). Dovetail blocks (4-1) fitted with the dovetail grooves (17) are fixed to the side ends of the two valve seats (4). O-ring seals (18) fitted with the dovetail blocks (4-1) are installed on the left half valve body (1) and the right half valve body (2).

7. A novel hard-sealed floating ball valve according to claim 6, characterized in that: First self-lubricating layers (4-2) are provided on the outer contour surfaces of the two valve seats (4), and second self-lubricating layers (4-1a) are provided on the outer contour surfaces of the dovetail blocks (4-1).

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