Ball valve with high sealing performance

Abstract

The high-sealing-performance ball valve comprises a valve body, a high platform and a valve rod, the high platform is fixed to the upper end of the valve body, the valve rod is connected to the high platform through a bearing, a self-locking mechanism is installed at the lower end of the valve rod, and the self-locking mechanism and a ball body are mutually fixed; and rotating shafts connected in the valve body through bearings are fixed above and below the ball body. According to the ball valve with the high sealing performance, through the effect of the fastening mechanism, the fit tightness between the sealing mechanism and the ball body can be adjusted, so that when the ball body rotates, the tightness between the sealing mechanism and the ball body is reduced, the friction force between the sealing mechanism and the ball body is reduced, and the ball body can rotate conveniently; abrasion to the sealing mechanism during rotation of the ball can be reduced, the service life of the sealing mechanism is effectively prolonged, the tightness of the sealing mechanism and the ball can be further improved after rotation of the ball is completed, and the sealing effect between the sealing mechanism and the ball is effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of ball valves, in particular to a ball valve with high sealing performance. Background Art

[0002] A ball valve is a rotary valve consisting primarily of a valve body, a valve stem, and a ball. Since the ball is the opening and closing member, its primary function is to rotate the ball 90° to align or dislocate the through-hole on the ball with the pipe, thereby quickly disconnecting or connecting the ball. Therefore, conventionally designed ball valves must be fully open or fully closed and cannot be used as throttling valves. (If the ball valve is half-open, high-speed fluid will directly flush the sealing surface, accelerating wear or failure of the sealing material and shortening the life of the ball valve.) In actual use of existing ball valves, in order to ensure the sealing performance of the ball valve, there is a hard and tight contact between the ball and the seal, which causes a large friction between the ball and the seal. This makes it difficult to rotate the ball to open and close, and during long-term use, the friction between the ball and the seal affects the sealing performance and service life of the seal. Summary of the Invention

[0003] The object of the present invention is to provide a ball valve with high sealing performance to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a highly sealing ball valve comprising a valve body, a high platform and a valve stem, wherein a high platform is fixed to the upper end of the valve body, a valve stem is connected to a bearing on the high platform, a self-locking mechanism is installed at the lower end of the valve stem, the self-locking mechanism and the ball are fixed to each other, the ball is fixed with bearings connected to a rotating shaft in the valve body at the upper and lower ends, a sealing mechanism is symmetrically arranged on the side of the ball, the sealing mechanism is nested and installed in the valve body, the sealing mechanism and the fastening mechanism are connected to each other, the fastening mechanism comprises a connecting rod symmetrically fixed to the mounting ring at the upper and lower ends, the connecting rod and the boss are slidably connected, the boss is fixed at equal angles on a circular plate, and four bosses are provided on the circular plate, and the circular plate is symmetrically fixed to the rotating shaft of the ball at the upper and lower ends.

[0005] Preferably, the valve body is symmetrically fixed with a mounting flange by bolts, and a pressure ring is fixed on the mounting flange, and the pressure ring and the valve body are nested and connected, and the pressure ring contacts the fixed ring to achieve positioning. Through the action of the pressure ring, the fixing ring can be tightened and limited to ensure the stability of the device assembly.

[0006] Preferably, a sealing ring is further provided between the mounting flange and the valve body, and the sealing ring and the valve body are nested and connected. The sealing ring can effectively ensure the sealing effect between the mounting flange and the valve body to avoid fluid leakage.

[0007] Preferably, the self-locking mechanism includes a truncated cone fixed on the rotating shaft on the upper side of the sphere, and the truncated cone and the valve stem are connected by a bearing, and a strip groove is provided on the truncated cone, and a rocker rod is provided in the strip groove. The rocker rod is fixed on the valve stem symmetrically on the left and right, and the rocker rod is driven to rotate by the rotation of the valve stem. When the end of the rocker rod contacts the side wall of the strip groove to generate a force, it can provide a basic force for the rotation of the truncated cone and the sphere, thereby ensuring the normal operation of the device.

[0008] Preferably, a convex shaft is fixed to the upper end face of the rocker arm, and the convex shaft and the inclined arc plate are slidably connected, and the inclined arc plate is symmetrically fixed to the lower end face of the movable tooth plate front and back, and at the same time, the maximum distance between the inclined surfaces of the two inclined arc plates is greater than the width of the strip groove. The convex shaft is driven to rotate by the rotation of the rocker arm, and the sliding action between the convex shaft and the inclined arc plate can provide a basic force for the movement of the movable tooth plate, thereby providing a basic guarantee for releasing the lock of the ball, and thus ensuring the normal operation of the device.

[0009] Preferably, a sliding rod is fixed symmetrically in front and behind the lower end face of the movable tooth plate, and the sliding rod and the round table are slidably connected, and the lower end of the sliding rod and one end of the first spring are fixed to each other, and the other end of the first spring is fixed in the round table. When the movable tooth plate is forced to move, the sliding guiding action between the sliding rod and the round table can ensure that the movable tooth plate performs stable linear motion. Combined with the elastic action of the first spring, it can provide a basic force for the automatic reset of the movable tooth plate, thereby providing a basic guarantee for the locking of the sphere.

[0010] Preferably, the movable latch plate and the fixed latch plate are in a snap-fit ​​connection, and the fixed latch plate is fixed in the high platform. The ball can be locked by the snap-fit ​​action between the movable latch plate and the fixed latch plate, thereby ensuring the stability of the ball after adjustment.

[0011] Preferably, the sealing mechanism includes a fixing ring nested with the valve body, and the fixing ring is symmetrically distributed about the center line of the valve body, and a mounting ring is provided on the side of the fixing ring close to the sphere. Through the above structure, the installation and positioning of the sealing mechanism can be facilitated.

[0012] Preferably, a sealing ring is fixed on the side of the mounting ring close to the sphere, and the sealing ring contacts the sphere to achieve sealing, and the sealing ring contacts the inner wall of the valve body to achieve sealing. At the same time, the sealing ring is made of rubber material. Through the action of the sealing ring, the sealing of the device can be guaranteed, thereby ensuring the stable operation of the device.

[0013] Preferably, a guide rod is fixed at an equal angle on one side of the mounting ring close to the fixing ring, and the guide rod and the fixing ring are slidingly connected, and a second spring is also fixed between the guide rod and the fixing ring. The second spring provides force to the guide rod, the mounting ring and the sealing ring, thereby ensuring the sealing effect between the sealing ring and the sphere.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This high-sealing ball valve can adjust the tightness of the fit between the sealing mechanism and the ball through the action of the fastening mechanism. When the ball rotates, the tightness between the sealing mechanism and the ball is reduced, thereby reducing the friction between the sealing mechanism and the ball. This can not only facilitate the rotation of the ball, but also reduce the wear on the sealing mechanism caused by the rotation of the ball, effectively extending the service life of the sealing mechanism. After the ball rotates, the tightness between the sealing mechanism and the ball can be further increased, effectively ensuring the sealing effect between the sealing mechanism and the ball. 2. This highly sealed ball valve adopts an elastic rotary self-locking mechanism, which can not only automatically unlock the ball when the ball is rotated, facilitating the normal rotation of the ball, thereby ensuring the normal operation of the ball valve, but also realize the self-locking effect of the ball after the rotation is completed, thereby ensuring the stability of the position of the ball after adjustment.

[0015] 3. When the valve stem rotates, the initial rotation of the valve stem will not immediately drive the ball to rotate. The rocker arm must exert force on the side wall of the strip groove to control the opening and closing of the valve. This can effectively avoid accidental contact with the valve stem, which may cause the ball to rotate and the valve to be opened or closed by accident. This better ensures the safety of the valve. In the initial idling stage of the valve stem, slight friction can be effectively avoided, thereby effectively reducing the ineffective wear caused by accidental contact and better ensuring the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the front cross-sectional three-dimensional structure of the valve body of the present invention; Figure 2 This is a schematic diagram of the overall three-dimensional structure of the device of the present invention; Figure 3 This is a schematic diagram of the exploded three-dimensional structure of the self-locking mechanism and the sphere of the present invention; Figure 4 It is a partial cross-sectional enlarged three-dimensional structural diagram of the self-locking mechanism of the present invention; Figure 5 This is a schematic diagram of a three-dimensional structure composed of a frustum and strip grooves of the present invention; Figure 6 It is a schematic diagram of the cross-sectional three-dimensional structure of the sealing mechanism of the present invention; Figure 7 It is a schematic diagram of the cross-sectional three-dimensional structure of the sealing mechanism and the fastening mechanism of the present invention.

[0017] In the figure: 1. valve body; 2. mounting flange; 201. pressure ring; 202. sealing ring; 3. high platform; 4. valve stem; 5. self-locking mechanism; 501. round table; 502. strip groove; 503. rocker arm; 504. convex shaft; 505. inclined arc plate; 506. movable latch plate; 507. sliding rod; 508. first spring; 509. fixed latch plate; 6. sphere; 7. sealing mechanism; 701. fixing ring; 702. mounting ring; 703. sealing ring; 704. guide rod; 705. second spring; 8. fastening mechanism; 801. connecting rod; 802. boss; 803. round plate. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 7 The present invention provides a technical solution: a high-sealing ball valve, including a valve body 1, a high platform 3 and a valve stem 4, the upper end of the valve body 1 is fixed with a high platform 3, the high platform 3 is connected to the valve stem 4 with a bearing, the lower end of the valve stem 4 is installed with a self-locking mechanism 5, the self-locking mechanism 5 and the ball 6 are fixed to each other, the upper and lower parts of the ball 6 are fixed with bearings connected to the rotating shaft in the valve body 1, and the sides of the ball 6 are symmetrically provided with sealing mechanisms 7.

[0020] The valve body 1 is symmetrically fixed with a mounting flange 2 by bolts, and a pressure ring 201 is fixed on the mounting flange 2, and the pressure ring 201 and the valve body 1 are nested, and the pressure ring 201 is in contact with the fixing ring 701 to achieve positioning; a sealing ring 202 is also provided between the mounting flange 2 and the valve body 1, and the sealing ring 202 and the valve body 1 are nested; the self-locking mechanism 5 includes a frustum 501 fixed on the upper rotating shaft of the sphere 6, and the frustum 501 is connected to the valve stem 4 by a bearing, and a strip groove 502 is provided on the frustum 501, and a rocker rod 503 is provided in the strip groove 502, and the rocker rod 503 is fixed to the valve stem 4 symmetrically; the upper end face of the rocker rod 503 is fixed with The convex shaft 504 is connected to the inclined arc plate 505 in a sliding manner, and the inclined arc plate 505 is symmetrically fixed to the lower end surface of the movable tooth plate 506 in the front and back directions, and the maximum distance between the inclined surfaces of the two inclined arc plates 505 is greater than the width of the strip groove 502; the lower end surface of the movable tooth plate 506 is symmetrically fixed with a sliding rod 507 in the front and back directions, and the sliding rod 507 is connected to the round table 501 in a sliding manner, and the lower end of the sliding rod 507 is fixed to one end of the first spring 508, and the other end of the first spring 508 is fixed to the round table 501; the movable tooth plate 506 is connected to the fixed tooth plate 509 in a snap-fitting manner, and the fixed tooth plate 509 is fixed in the high platform 3; When using this high sealing ball valve, if Figure 1-Figure 7As shown, first, the entire ball valve can be installed on the fluid delivery pipeline by fitting the bolts through the mounting flange 2. At this time, the through hole on the ball 6 is in a fitted and aligned state with the pipeline. When the ball 6 is rotated to close, it is only necessary to rotate the valve stem 4. Since the valve stem 4 and the round table 501 are connected by a bearing, and the movable latch plate 506 and the fixed latch plate 509 are engaged and limited, the valve stem 4 will not drive the round table 501 to rotate when it rotates. At this time, when the valve stem 4 rotates, it will synchronously drive the rocker arm 503 and the convex shaft 504 to rotate, and the convex shaft 504 and the inclined arc are connected. The sliding action between the upper inclined surfaces of the shaped plate 505 causes the movable latch plate 506 to be forced to move upward, and the sliding action between the slide rod 507 and the round table 501 can ensure the stability of the movement of the movable latch plate 506. At this time, the first spring 508 is forced to contract. When the convex teeth on the lower end surface of the movable latch plate 506 are completely separated from the convex teeth on the upper end surface of the fixed latch plate 509, the locking effect of the round table 501 and the ball 6 can be released. At this time, the valve stem 4 continues to rotate, thereby continuing to drive the rocker arm 503 and the convex shaft 504 to rotate. When the rocker arm 503 contacts the side wall of the strip groove 502, At this time, the convex shaft 504 is still on the inclined surface of the inclined arc plate 505. At this time, the valve stem 4 is continued to rotate, so that the rocker rod 503 generates a force on the side wall of the strip groove 502, thereby driving the round table 501 and the ball 6 to rotate, thereby realizing the adjustment effect of the ball 6, and when the round table 501 and the ball 6 rotate, the convex shaft 504 and the inclined arc plate 505 rotate synchronously with the round table 501 and the ball 6, so that the relative positions of the convex shaft 504 and the inclined arc plate 505 remain unchanged until the ball 6 rotates 90 degrees to complete the closing of the ball valve. At this time, the valve stem 4 is released, and the ball 6 is opened. Under the elastic action of a spring 508, the movable latch plate 506 is forced to move downward and automatically reset to engage with the fixed latch plate 509, thereby realizing the locking effect of the round table 501 and the ball 6, ensuring the stability of the ball 6 after adjustment. When the movable latch plate 506 is forced to move downward, it simultaneously drives the inclined curved plate 505 to move downward. Cooperating with the sliding action between the inclined curved plate 505 and the convex shaft 504, the valve stem 4 is forced to rotate in the opposite direction relative to the round table 501 until the convex shaft 504 is reset to the middle position between the two inclined curved plates 505, so that the next adjustment can be carried out normally. The sealing mechanism 7 is nested and installed in the valve body 1. The sealing mechanism 7 is connected to the fastening mechanism 8. The fastening mechanism 8 includes a connecting rod 801 fixed on the mounting ring 702 symmetrically up and down. The connecting rod 801 and the boss 802 are in sliding connection. The boss 802 is fixed on the circular plate 803 at equal angles, and there are four bosses 802 on the circular plate 803. The circular plate 803 is fixed on the rotating axis of the sphere 6 symmetrically up and down. The sealing mechanism 7 includes a fixing ring 701 nested and installed with the valve body 1, and the fixing ring 701 is symmetrically distributed about the center line of the valve body 1. A mounting ring 702 is provided on the side of the fixing ring 701 close to the ball 6; a sealing ring 703 is fixed on the side of the fixing ring 702 close to the ball 6, and the sealing ring 703 contacts the ball 6 to achieve a seal, and the sealing ring 703 contacts the inner wall of the valve body 1 to achieve a seal, and the sealing ring 703 is made of rubber material; a guide rod 704 is fixed at an equal angle on the side of the fixing ring 701 of the fixing ring 702, and the guide rod 704 and the fixing ring 701 are in sliding connection, and a second spring 705 is also fixed between the guide rod 704 and the fixing ring 701; During the rotation adjustment of the ball 6, Figure 1-Figure 7 As shown, when the ball 6 rotates, the circular plate 803 and the boss 802 are synchronously driven to rotate. When the boss 802 is separated from the connecting rod 801, the fastening effect on the sealing ring 703 is released, and the sealing force between the sealing ring 703 and the ball 6 is mainly provided by the elastic force of the second spring 705, so that the seal between the sealing ring 703 and the ball 6 is converted from a hard seal to an elastic seal, effectively reducing the friction between the sealing ring 703 and the ball 6, which can facilitate the rotation adjustment of the ball 6 and reduce the wear of the sealing ring 703 caused by the rotation of the ball 6. During the rotation of the ball 6, the circular plate 803 and the boss 802, when the connecting rod 801 contacts and slides with the next boss 802, the connection The rod 801 moves under the force, and the action of the connecting rod 801 can generate a certain pulling force on the mounting ring 702, so that the mounting ring 702 generates pressure on the sealing ring 703. Since the sealing ring 703 is made of rubber, the elastic action of the sealing ring 703 itself increases the fit tightness between the sealing ring 703 and the ball 6 until the ball 6, the circular plate 803 and the boss 802 rotate 90°. At this time, the connecting rod 801 contacts the highest point of the arc surface of the boss 802. At this time, the fit tightness between the sealing ring 703 and the ball 6 is the greatest, and at this time, the seal between the sealing ring 703 and the ball 6 is changed from an elastic seal to a hard seal, which effectively ensures the sealing effect between the sealing ring 703 and the ball 6. This is the working principle of the high-sealing ball valve.

[0021] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0022] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method of the present invention and its core ideas. The above is only a preferred implementation method of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of the present invention.

Claims

1. A ball valve with high sealing performance, comprising a valve body (1), a high platform (3) and a valve stem (4), wherein the high platform (3) is fixed to the upper end of the valve body (1), and the valve stem (4) is connected to a bearing on the high platform (3), characterized in that: A self-locking mechanism (5) is installed at the lower end of the valve stem (4), and the self-locking mechanism (5) and the ball (6) are fixed to each other. The ball (6) is fixed with bearings on the upper and lower sides to connect the rotating shaft in the valve body (1). A sealing mechanism (7) is symmetrically arranged on the side of the ball (6), and the sealing mechanism (7) is nested and installed in the valve body (1). The sealing mechanism (7) and the fastening mechanism (8) are connected to each other, and the fastening mechanism (8) includes a connecting rod (801) fixed on the mounting ring (702) symmetrically in the upper and lower directions, and the connecting rod (801) and the boss (802) are in sliding connection. The boss (802) is fixed on the circular plate (803) at equal angles, and four bosses (802) are arranged on the circular plate (803). The circular plate (803) is symmetrically fixed on the rotating shaft of the ball (6) in the upper and lower directions.

2. A high-sealing ball valve according to claim 1, characterized in that: The valve body (1) is symmetrically fixed with a mounting flange (2) by bolts, and a pressure ring (201) is fixed on the mounting flange (2), and the pressure ring (201) and the valve body (1) are nested and connected, and the pressure ring (201) and the fixing ring (701) are in contact to achieve positioning.

3. A high-sealing ball valve according to claim 2, characterized in that: A sealing ring (202) is further provided between the mounting flange (2) and the valve body (1), and the sealing ring (202) and the valve body (1) are nested in connection.

4. A high-sealing ball valve according to claim 1, characterized in that: The sealing mechanism (7) comprises a fixing ring (701) nested with the valve body (1), wherein the fixing ring (701) is symmetrically distributed with respect to the center line of the valve body (1), and a mounting ring (702) is provided on a side of the fixing ring (701) close to the sphere (6).

5. A high-sealing ball valve according to claim 4, characterized in that: A sealing ring (703) is fixed on the side of the mounting ring (702) close to the sphere (6), and the sealing ring (703) contacts the sphere (6) to achieve sealing, and the sealing ring (703) contacts the inner wall of the valve body (1) to achieve sealing, and the sealing ring (703) is made of rubber material. A guide rod (704) is fixed at an equal angle on the side of the mounting ring (702) close to the fixing ring (701), and the guide rod (704) and the fixing ring (701) are in sliding connection, and a second spring (705) is also fixed between the guide rod (704) and the fixing ring (701).

6. A self-locking mechanism, characterized in that: The invention is applied to the self-locking of the valve in the open and closed state. The self-locking mechanism (5) includes a truncated table (501) fixed on the upper rotating shaft of the sphere (6), and the truncated table (501) and the valve stem (4) are connected by a bearing. A strip groove (502) is provided on the truncated table (501), and a rocker rod (503) is provided in the strip groove (502). The rocker rod (503) is fixed on the valve stem (4) symmetrically on the left and right. A convex shaft (504) is fixed on the upper end face of the rocker rod (503), and a sliding connection is formed between the convex shaft (504) and the inclined arc plate (505), and the inclined arc plate (505) is fixed on the movable tooth plate symmetrically in front and back. (506) lower end surface, and the maximum distance between the inclined surfaces of the two inclined arc plates (505) is greater than the width of the strip groove (502), and the sliding rod (507) is fixed symmetrically in front and back of the lower end surface of the movable tooth plate (506), and the sliding rod (507) and the round table (501) are slidably connected, and the lower end of the sliding rod (507) and one end of the first spring (508) are fixed to each other, and the other end of the first spring (508) is fixed in the round table (501), and the movable tooth plate (506) and the fixed tooth plate (509) are engaged, and the fixed tooth plate (509) is fixed in the high platform (3).

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