Hydraulic auxiliary bidirectional sealing slurry ball valve

Abstract

A hydraulic auxiliary bidirectional sealing slurry ball valve comprises a valve body (5) provided with a valve rod (3), a spherical valve clack (4) driven by the valve rod (3), connecting bodies (1) arranged on the two sides of the valve body (5) and floating valve seats (2) limited in the connecting bodies (1) in a sliding mode, the floating valve seats (2) are matched with the spherical valve clack (4) in a sealing mode, and closed annular cavities (25) are formed between the connecting bodies (1) and the floating valve seats (2). And the closed annular cavity (25) is communicated with the fluid driving system (6) through the channel (11). The device has the advantages of reliable sealing performance, simple structure, simplicity and convenience in operation, high system stability, long service life, low maintenance cost, wide application range and the like.

Description

Technical Field

[0001] The utility model relates to the field of solid-liquid two-phase medium transportation, and specifically relates to a hydraulic-assisted two-way seal slurry ball valve. It is mainly applicable to media such as slurry, oil, gas, and water. Background Technique

[0002] At present, the control of medium and high-pressure slurry transportation pipe networks mainly uses fixed-ball hard-sealed ball valves. Its structure is the same as that of the traditional fixed-ball floating-seat ball valve: a spring is arranged on the back side of the valve seat to provide pre-sealing pressure, and then the medium pressure at the small end of the valve seat is used. The two act together to form the entire sealing pressure to achieve valve sealing. However, since the slurry contains a large number of solid particles, when the ball valve rotates from open to closed, the flow channel is connected to the valve cavity, and the solid particles in the slurry will deposit at the bottom of the valve cavity. As the number of valve openings and closings increases, the deposits become more and more, eventually causing the valve cavity to become blocked, the valve ball to rotate difficultly, and the valve opening and closing torque to increase. In addition, some deposits will also adhere to the surface of the valve ball, which is very likely to cause wear of the sealing surface and internal leakage during the opening and closing process. After the sealing surface is worn, the friction coefficient will increase, so the opening and closing torque will increase again. Eventually, the valve will fail due to internal leakage or inability to open and close.

[0003] To solve the above problems, the following solutions have been designed: by increasing the torque coefficient of the valve driving device and increasing the specification of the driving device to ensure that the driving torque is large enough; by improving the performance of the hard-sealing material, heat treatment, and processing technology level, to improve the hardness of the valve ball and valve seat sealing surfaces and the matching accuracy between them, thereby improving the service life of the valve. However, there are still the following problems: the valve opening and closing torque is large, resulting in a large specification model and high cost of the valve driving device. The valve life has not been significantly improved and cannot meet the user's needs.

[0004] The following technical solutions are also disclosed in the prior art. For example, the utility model patent with the authorization announcement number CN204922078U discloses "a ball valve with a telescopic sealing ring". In this technical solution, when opening the valve, first drive the telescopic device E away from the near sphere C through the telescopic driving device F. After opening and closing in place, then drive the telescopic device E close to the sphere C through the telescopic driving device F to achieve sealing. The positive pressure required for valve sealing is completely provided by the telescopic driving device F. However, there are still the following problems: the positive sealing pressure required for the sphere (valve) C is completely provided by the telescopic driving device F. Its torque is converted into the linear driving force of the sealing ring D through structures such as gears, turbines, and lead screws in sequence. Due to the overly complex and cumbersome structure, it is difficult to meet the requirements of miniaturization of the overall valve structure size.

[0005] Due to the use of a dual drive structure (stem drive G and telescopic drive F), the internal structure of the entire valve body is complex, difficult to miniaturize, and prone to failure. The logic of the control system is complicated, and the equipment reliability is poor. Specifically, in the control system, it is also necessary to consider the coordinated control of the rotation of the valve stem drive G to open the ball C and the telescopic drive F to drive the seal ring D. Improper control can easily cause slurry to rush into the valve cavity between the ball C and the valve body B, resulting in internal leakage and failure of the valve body.

[0006] In addition, since the slurry contains a large amount of solid particles, the telescopic device E is very easy to wear during the telescopic process, which affects the sealing effect and shortens the service life of the valve. At the same time, the "telescopic drive device" needs to be operated frequently, which increases the maintenance cost and failure rate of the valve. In addition, this technical solution does not solve the problem of sediment adhesion on the surface of the valve ball, and there is still a risk of internal leakage due to wear of the sealing surface. In summary, the ball valves used for the control of medium and high pressure slurry conveying pipelines in the prior art have problems such as large opening and closing torque, short valve life, and poor sealing effect, which cannot meet user needs.

[0007] For example, the utility model patent with authorization announcement number CN217130387U discloses a hydraulic forced sealing structure for valves. In this technical solution, an axially movable sealing sleeve 6 driven by a hydraulic cylinder is used as the sealing structure of the ball valve disc 3, and the required positive pressure is completely provided by the oil cylinder. However, the following problems still exist: the annular oil cylinder is an open structure, including the left ball valve end cover 1, the ball valve body 2, the axially movable sealing sleeve 6, and the right ball valve end cover 7; the connection between the left ball valve end cover 1 or the right ball valve end cover 7 and the ball valve body 2 is an end face seal. Under the pressure of the annular oil cylinder, the left ball valve end cover 1 or the right ball valve end cover 7 is easy to deform, resulting in the corresponding sealing surface being prone to leakage; in addition, the internal structure of the entire valve body is complex, there are many end face seals, and there are many potential failure points, resulting in poor equipment reliability and difficulty in miniaturization.

[0008] Similarly, the utility model patent with authorization announcement number CN219975429U discloses a hydraulically controlled floating valve seat reciprocating movement mechanism for a valve. In this technical solution, the floating valve seats 7 on both sides are hydraulically driven to achieve sealing and unsealing with the ball valve disc, resulting in a complex internal structure of the entire valve body, a large number of end face seals, and many potential failure points, resulting in poor equipment reliability and difficulty in miniaturization. Utility Model Content

[0009] The purpose of the utility model is to provide a hydraulically assisted two-way sealing slurry ball valve, which fundamentally solves the above problems and has the advantages of reliable sealing performance, simple structure, simple and convenient operation, high system stability, long service life, low maintenance cost and wide application range.

[0010] To achieve the above object, the present utility model provides the following technical solutions: The hydraulic-assisted two-way sealed slurry ball valve includes a valve body provided with a valve stem, a spherical valve flap driven by the valve stem, connecting bodies arranged on both sides of the valve body, and a floating valve seat slidably limited within the connecting bodies. The technical key points are as follows:

[0011] The floating valve seat is in sealing cooperation with the spherical valve flap, and a closed annular cavity is formed between the connecting body and the floating valve seat. The closed annular cavity is communicated with the fluid driving system through a channel;

[0012] The inner side of the floating valve seat is provided with a first arc surface and a second arc surface that are concentrically arranged, and the radius of curvature of the first arc surface is greater than that of the second arc surface. The first arc surface and the second arc surface are separated by a sealing ring. The floating valve seat limits the sealing ring that cooperates with the outer wall of the spherical valve flap through a sealing groove;

[0013] A gap is reserved between the first arc surface of the floating valve seat and the spherical valve flap, and the second arc surface of the floating valve seat just cooperates with the spherical valve flap.

[0014] Further, the radius difference between the first arc surface and the second arc surface is 1 - 3 mm.

[0015] Further, the sealing ring is made of a flexible or rigid material.

[0016] Further, the fluid driving system adopts hydraulic or pneumatic drive.

[0017] Further, a sealed bottom cavity is formed among the connecting body, the spherical valve flap, and the valve body, and a flushing water inlet hole and a drain hole are arranged on the bottom cavity.

[0018] Further, a spring is arranged between the connecting body and the floating valve seat.

[0019] The beneficial effects of the present utility model: In the overall technical solution, the present utility model firmly seals the floating valve seat on both sides of the spherical valve flap through two-way auxiliary sealing of the fluid driving system, achieving good sealing performance.

[0020] Specifically in terms of the structure, a closed annular cavity is provided between each of the two connecting bodies and the floating valve seat. The two closed annular cavities are communicated with the fluid driving system through channels, providing sufficient and stable two-way hydraulic auxiliary sealing pressure for the floating valve seat. The spring limited between the floating valve seat and the connecting body also provides a pre-tightening sealing pressure. The resultant force of the fluid pressure of the fluid driving system, the elastic force of the spring, and the fluid pressure in the valve cavity makes the sealing of the floating valve seat more reliable.

[0021] Take the bi-directional hydraulic auxiliary sealing pressure as the main sealing pressure, thereby reducing the pre-sealing pressure required by the spring; by adjusting the ratio of the first arc area S1 of the floating valve seat to the radial area S2 of the conical surface, the pressure on the radial area S1 of the floating valve seat is opposite to the pressure on the radial area S2, thereby offsetting part of the forward pressure of the fluid; before the spherical valve flap rotates, the enclosed annular cavity is depressurized through the fluid drive system, the positive pressure on the spherical valve flap is greatly reduced, and the opening and closing torque is greatly reduced.

[0022] An inlet hole and a drain hole are arranged on the bottom cavity. The inlet hole is connected to the flushing water pipe through a one-way valve, and an electric ball valve is arranged on the drain hole to form a valve cavity flushing system. After the slurry ball valve is opened and closed, the bottom cavity is flushed by using the valve cavity flushing system, effectively preventing the bottom cavity from being blocked by the precipitation of solid particles in the slurry, thereby eradicating the valve failure caused by the blockage of the bottom cavity and greatly improving the valve life.

[0023] By setting the sealing ring, the material requirements and process difficulty for the spherical valve flap and the floating valve seat are reduced, thereby reducing the manufacturing cost of the entire valve.

[0024] In summary, the utility model does not need to additionally increase an annular oil cylinder and related structures, has a simpler structure, more reliable sealing, is easier to miniaturize the valve body, and has the advantages of reliable sealing performance, simple and convenient operation, high system stability, long service life, low maintenance cost, and wide application range. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic cross-sectional structure view of the utility model.

[0026] Figure 1a is Figure 1 The partial enlarged structure view of.

[0027] Figure 2 It is a schematic structure view of the connecting body of the utility model.

[0028] Figure 3 It is a schematic structure view of the floating valve seat of the utility model.

[0029] Figure 4 It is a schematic view of the valve cavity flushing system of the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following combines Figures 1 to 4 to describe the specific content of the utility model in detail through specific embodiments. Embodiment 1

[0031] Such as Figure 1As shown in the figure, the hydraulic-assisted two-way sealed slurry ball valve includes a valve body 5 provided with a valve stem 3, a spherical valve flap 4 driven by the valve stem 3, connecting bodies 1 arranged on both sides of the valve body 5, and a floating valve seat 2 slidably limited within the connecting bodies 1. Among them, the floating valve seat 2 is in sealing cooperation with the spherical valve flap 4. A number of sealing rings 26 are further provided on the outer edge of the floating valve seat 2. A closed annular cavity 25 is formed between the connecting body 1 and the floating valve seat 2. A spring 12 is provided between the connecting body 1 and the floating valve seat 2. The closed annular cavity 25 is communicated with a fluid driving system 6 through a channel 11. The fluid driving system 6 preferably adopts hydraulic or pneumatic driving.

[0032] As Figure 1a , Figure 2 , Figure 3 shown in the figure, the inner side of the floating valve seat 2 is provided with a first arc surface 24 and a second arc surface 28 arranged concentrically. The radius difference between the first arc surface 24 and the second arc surface 28 is 1 - 3 mm, and the curved surface radius of the first arc surface 24 is greater than that of the second arc surface 28. The first arc surface 24 and the second arc surface 28 are separated by a sealing ring 211. The floating valve seat 2 limits the sealing ring 211 that cooperates with the outer wall of the spherical valve flap 4 through a sealing groove 21. The sealing ring 211 is made of a flexible or rigid material, such as rubber, silica gel, etc. Thus, a gap 22 is reserved between the first arc surface 24 of the floating valve seat 2 and the spherical valve flap 4, and the second arc surface 28 of the floating valve seat 2 just cooperates with the spherical valve flap 4.

[0033] The connecting bodies 1 on both sides and the floating valve seat 2 form a closed annular cavity 25 through cooperation and sealing, and are respectively fixedly arranged on both sides of the valve body 5. The closed annular cavities 25 on both sides are communicated with the fluid driving system 6 through a channel 11 to provide two-way hydraulic-assisted sealing power. The sealing ring 211 is embedded in the sealing groove 21, and the radius difference between the first arc surface 24 and the second arc surface 28 is 1 - 3 mm, so that a gap 22 can still be formed on the premise of ensuring the seal between the floating valve seat 2 and the spherical valve flap 4. Moreover, by setting the gap 22, the positive fluid can act on the conical surface 23 and the first arc surface 24 isobarically, and by adjusting the conical cross-sectional area ratio of the two, the pressure difference can be adjusted. Specifically, when the spherical valve flap 4 is in the open state, the axial cross-sectional area of the conical surface 23 of the left floating valve seat 2 is S1, and it is subjected to positive fluid ( Figure 1aa forward rightward pressure F1 (in the rightward direction), the first arc surface 24 is subjected to a reverse (leftward) pressure F2 from the forward fluid entering the gap 22, the floating valve seat 2 is subjected to a rightward elastic force F3 from the spring 12, and a hydraulic or pneumatic pressure F4 from the fluid drive system 6 in the enclosed annular cavity 25. At this time, the resultant rightward force F on the left side of the floating valve seat 2 is F = F1 - F2 + F3 + F4. Similarly, the right side of the floating valve seat 2 is subjected to a resultant leftward force from the forward fluid, the hydraulic or pneumatic pressure of the fluid drive system 6, and the spring 12. By adjusting the ratio of the conical area S1 of the first arc surface 24 to the conical area S2 of the small end conical surface 23 of the floating valve seat 2, when F1 = F2, the forward medium pressure can be completely offset.

[0034] In summary, the medium pressure in the gap 22 is used to provide a reverse pressure for the floating valve seat 2. By adjusting the ratio of the area of the first arc surface 24 to the area of the small end conical surface 23 of the floating valve seat 2, part or all of the forward medium pressure is offset, realizing the regulation of the opening and closing torque; under the combined action of the pressure of the spring 12, the medium pressure, and the pressure of the fluid drive system 6, the bidirectional sealing of the spherical valve flap 4 is realized.

[0035] When it is necessary to close the spherical valve flap 4, the enclosed annular cavity 25 is depressurized through the fluid drive system 6, and the pressure applied on both sides of the spherical valve flap 4 is greatly reduced. At this time, the resultant rightward force F on the left side of the floating valve seat 2 is F = F1 - F2 + F3 (the resultant force on the right side of the floating valve seat 2 is the same), and the opening and closing torque is greatly reduced.

[0036] As Figure 4 shown, a sealed bottom cavity 51 is formed between the connecting body 1, the spherical valve flap 4, and the valve body 5. A flushing water inlet hole 52 and a drain hole 53 are provided on the bottom cavity 51. The water inlet hole 52 is connected to a flushing water pipe through a check valve end or an electric ball valve, and the drain hole 53 is connected to an electric ball valve or an electric ball valve to form a flushing system for the bottom cavity 51. After the valve is opened and closed, the bottom cavity 51 is flushed through the flushing water pipe, the water inlet hole 52, and the drain hole 53 to prevent sediment from blocking the bottom cavity 51.

[0037] Explanation of reference numerals: 1 connecting body, 11 channel, 12 spring;

[0038] 2 floating valve seat, 21 sealing groove, 211 sealing ring, 22 gap, 23 conical surface, 24 first arc surface, 25 enclosed annular cavity, 26 sealing ring, 27 valve cavity, 28 second arc surface;

[0039] 3 valve stem;

[0040] 4 spherical valve flap;

[0041] 5 Valve body, 51 Bottom cavity, 52 Water inlet hole, 53 Drain hole;

[0042] 6 Fluid drive system.

Claims

1. A hydraulically assisted two-way sealing slurry ball valve, comprising a valve body (5) provided with a valve stem (3), a spherical valve disc (4) driven by the valve stem (3), a connecting body (1) arranged on both sides of the valve body (5), and a floating valve seat (2) slidably limited in the connecting body (1), characterized in that: The floating valve seat (2) and the spherical valve disc (4) are sealed and matched, and a closed annular cavity (25) is formed between the connecting body (1) and the floating valve seat (2), and the closed annular cavity (25) is connected to the fluid drive system (6) through the channel (11); A first arcuate surface (24) and a second arcuate surface (28) are concentrically arranged on the inner side of the floating valve seat (2), and the radius of curvature of the first arcuate surface (24) is greater than that of the second arcuate surface (28). The first arcuate surface (24) and the second arcuate surface (28) are separated by a sealing ring (211). The floating valve seat (2) is limited by a sealing groove (21) to form a sealing ring (211) that matches the outer wall of the spherical valve disc (4). A gap (22) is reserved between the first arc surface (24) of the floating valve seat (2) and the spherical valve flap (4), and the second arc surface (28) of the floating valve seat (2) just fits with the spherical valve flap (4); A sealed bottom cavity (51) is formed between the connector (1), the spherical valve flap (4) and the valve body (5), and a flushing water inlet hole (52) and a drainage hole (53) are arranged on the bottom cavity (51).

2. The hydraulically assisted bidirectional sealing slurry ball valve according to claim 1 is characterized in that: The radius difference between the first arcuate surface (24) and the second arcuate surface (28) is 1-3 mm.

3. The hydraulically assisted bidirectional sealing slurry ball valve according to claim 1 is characterized in that: The sealing ring (211) is made of a flexible or rigid material.

4. The hydraulically assisted bidirectional sealing slurry ball valve according to claim 1 is characterized in that: The transition angle between the inner flow channel of the connector (1) and the valve seat is 20° to 40°.

5. The hydraulically assisted bidirectional sealing slurry ball valve according to any one of claims 1 to 3, characterized in that: The fluid drive system (6) is driven by hydraulic or pneumatic means.

6. The hydraulically assisted bidirectional sealing slurry ball valve according to claim 4 is characterized in that: A spring (12) is provided between the connecting body (1) and the floating valve seat (2).

Images