V-shaped slurry ball valve with self-cleaning valve cavity

Abstract

A V-shaped slurry ball valve with a self-cleaning valve cavity comprises a side body (5), a valve seat (4) slidably limited on the side body (5), a valve rod assembly (2) rotatably arranged on a middle body (6) and a valve clack (1) matched with the valve rod assembly (2) to rotate, and is technically characterized in that the valve clack (1) is in a ball-wedge-like shape and comprises a spherical outer wall (13), a hinge part (11) matched with the valve rod assembly (2) and a flow channel (15) arranged on the inner side of the valve clack (1) and intersecting with a rotating shaft; a V-shaped flow guide part (12) is concavely arranged on the flow channel (15) on the inner side surface of the valve clack (1) along the drainage part (14); and a columnar curved surface formed by the rotation of the V-shaped flow guide part (12) takes the rotating shaft of the valve clack (1) as a center axis. The sealing device has the advantages of long service life, good sealing performance, low maintenance cost and the like.

Description

Technical Field

[0001] The utility model relates to a valve structure for solid-liquid two-phase media, in particular to a V-shaped slurry ball valve with self-cleaning valve cavity. Background Art

[0002] The slurry valve is a valve device used to control the flow of slurry, which is improved from the traditional hard-sealed fixed ball valve by increasing the hardness of the sealing surface. It is mainly used in pipeline systems to open or close the flow of slurry as needed. At present, fixed ball hard-sealed ball valves are mainly used for the control of medium and high-pressure slurry transportation pipe networks, but there are often the following problems: First, due to the sedimentation characteristics of the slurry, when the ball valve rotates from the open position to the closed position, the flow channel is connected to the valve cavity, and hard solid particles in the slurry will deposit at the bottom of the valve cavity and cannot be discharged by themselves. As the number of valve openings and closings increases, the sediment gradually accumulates, eventually causing the valve cavity to become blocked, resulting in difficult rotation of the valve ball and an increase in the opening and closing torque of the valve.

[0003] Second, the upper and lower valve stem bearings of the slurry valve are both in direct contact with the medium. Under the action of the medium pressure, solid particles in the slurry will enter the clearance between the valve stem and the sliding bearing, causing wear of the bearing or valve stem, an increase in the opening and closing torque, and even the valve stem being "locked", unable to rotate, resulting in valve failure.

[0004] In addition, a large amount of solid sediment will also adhere to the surface of the valve ball, which is extremely easy 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, resulting in an increase in the opening and closing torque again. It may also cause irreversible damage to the valve, ultimately leading to internal leakage failure of the valve. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a V-shaped slurry ball valve with self-cleaning valve cavity, which fundamentally solves the above problems and has the advantages of long service life, good sealing performance, low maintenance cost, etc.

[0006] To achieve the above purpose, the utility model provides the following technical solutions: The V-shaped slurry ball valve with self-cleaning valve cavity includes a side body, a valve seat slidably limited on the side body, a valve stem assembly rotatably arranged on the middle body, and a valve flap cooperating with the rotation of the valve stem assembly. The technical key points are:

[0007] The valve flap is a spherical wedge shape, including a spherical outer wall, a hinged part cooperating with the valve stem assembly, and a flow channel arranged on the inner side of the valve flap and intersecting with the rotating shaft.

[0008] Further, the valve flap is opened by flipping upwards.

[0009] Further, the flow channel is provided with a V-shaped guiding part concavely arranged along the guiding part on the inner side surface of the valve flap, and the cylindrical surface formed by the rotation of the V-shaped guiding part takes the rotating shaft of the valve flap as the central axis.

[0010] Furthermore, a first arc transition end is provided between the V-shaped flow guiding part and the drainage part, and a second arc transition end is provided between the V-shaped flow guiding parts.

[0011] Furthermore, the included angle of the V-shaped flow guiding part is 90°-120°.

[0012] Furthermore, the cross-sectional shape of the V-shaped flow guiding part can also be set as an arc or a trapezoid.

[0013] Furthermore, the valve flap is symmetrically arranged with respect to the horizontal or vertical mirror plane.

[0014] Furthermore, the valve stem assembly includes a driving valve stem and a driven valve stem coaxially arranged through a seal sleeve assembly; the outside of the seal sleeve assembly is fixed by screwing on the middle body, and the connecting flange is fixed on the middle body by screwing and passing through the seal sleeve assembly; the seal sleeve assembly includes a seal sleeve main body, a valve stem bearing fitted between the driving valve stem or the driven valve stem in the seal sleeve main body, a sealing ring arranged between the seal sleeve main body and the middle body and the valve stem, a side sealing ring arranged between the connecting flange and the seal sleeve main body, and a flat sealing gasket arranged between the seal sleeve main body and the hinged part.

[0015] Furthermore, an annular closed cavity is formed between the back side of the valve seat and the side body, and a plurality of identical compression springs are evenly arranged in the cavity to provide sealing force.

[0016] Furthermore, an annular closed cavity is formed between the back side of the valve seat and the side body, and the sealing force can also be provided by connecting an external hydraulic system through the annular closed cavity.

[0017] The beneficial effects of the present utility model: In the overall technical solution, when the valve is installed, it is ensured that the valve stem is horizontally placed, and when the valve is in the open state, the valve flap is located in the upper part of the valve cavity. Due to the V-shaped structure of the valve flap, the direction of the fluid is changed, so that there is no dead point in the entire flow channel; then, by utilizing the flow velocity characteristics of the slurry (there are requirements for the flow velocity in slurry transportation, and it must be greater than the non-silting flow velocity of the slurry), the self-cleaning function of the valve cavity is realized.

[0018] In terms of the specific structure, by using a special V-shaped valve flap structure (through its V-shaped dimension design, it is ensured that when the valve is opened, the cross-sectional area of the entire flow channel is basically the same and the flow velocity is basically unchanged, making full use of the non-silting flow velocity characteristics in slurry pipeline transportation), when the V-shaped valve is opened, the valve cavity is communicated with the flow channel, and the flow direction of the slurry is changed by the V-shaped valve flap, and the flow direction of the slurry is in a "V" shape. Then, by utilizing the self-flow velocity characteristics of the slurry, the sinking solid particles are washed away, and by using the flow velocity of the medium, the deposition of solid particles in the slurry in the valve cavity is avoided, and the self-cleaning of the valve cavity is realized.

[0019] Furthermore, the V-shaped diversion part of the valve cavity can be set as a reduced-diameter structure. When the valve flap opens, according to the continuity equation (flow rate = flow velocity × cross-sectional area), under the condition of constant flow rate, when the slurry passes through this "reduced-diameter part", the cross-sectional area decreases and the flow velocity increases. According to Bernoulli's equation, the pressure of the fluid at the "reduced-diameter part" decreases, and a flow velocity difference is formed between the upstream and downstream of the V-shaped diversion part. A local low-pressure area is formed at the V-shaped diversion part, and air bubbles are formed in the valve cavity where solid particles are likely to deposit, continuously impacting the inner wall of the valve cavity to avoid the deposition of solid particles in the valve cavity. Without changing the structure of the valve flap, if the valve flap is changed to open by flipping downward, the solid particles in the slurry will deposit on the surface of the valve flap to form a siltation layer, affecting the performance of the valve.

[0020] The structural characteristics and sealing form of the sealing sleeve assembly achieve the function of preventing the valve stem from being blown out, ensure the overall sealing performance of the valve, completely isolate the valve stem bearing from the slurry medium, avoid the valve stem bearing being contaminated by the slurry, and the valve flap moves smoothly during opening and closing, greatly improving its service life. An oil storage tank is arranged in the sealing structure, which can realize the full-life cycle maintenance-free of the V-shaped valve, thereby extending the service life of the entire valve. Brief Description of the Drawings

[0021] Figure 1 It is a front view structural schematic diagram of the present utility model.

[0022] Figure 2 is Figure 1 A sectional structural schematic diagram along the A-A line.

[0023] Figure 2a is Figure 2 A partial enlarged structural schematic diagram of...

[0024] Figure 3 It is a sectional structural schematic diagram of the valve flap in the open state of the present utility model.

[0025] Figure 4 It is a sectional structural schematic diagram of the valve flap in the closed state of the present utility model.

[0026] Figure 5 It is an isometric side view structural schematic diagram of the valve flap of the present utility model.

[0027] Figure 6 It is a sectional structural schematic diagram of the valve flap of the present utility model. Detailed Description of the Embodiments

[0028] The following Figures 1 - 6 , through specific embodiments, details the specific content of the present utility model in detail. Embodiment 1

[0029] The valve chamber self-cleaning V-shaped slurry ball valve includes a side body 5, a valve seat 4 slidably limited on the side body 5, a valve stem assembly 2 rotatably arranged on the middle body 6, and a valve flap 1 that cooperates with the rotation of the valve stem assembly 2. A number of springs 51 in the same sliding direction as the valve seat 4 are provided between the back side of the valve seat 4 and the side body 5. In this embodiment, an annular closed cavity is formed between the back side of the valve seat 4 and the side body 5, and a number of identical compression springs 51 are evenly arranged in the cavity to provide sealing force.

[0030] Among them, the valve flap 1 is a spherical wedge shape, including a spherical outer wall 13 (preferably a 1 / 5 - 1 / 4 sphere), a hinge part 11 that cooperates with the valve stem assembly 2, and a flow channel 15 arranged inside the valve flap 1 and intersecting with the rotating shaft. The hinge parts 11 on both sides are respectively matched with the active valve stem 24 and the passive valve stem 25, and the aperture of the hinge part 11 is smaller than the maximum diameter of the flat gasket 33.

[0031] As Figure 2 、 Figure 2a shown, the valve stem assembly 2 includes an active valve stem 24 and a passive valve stem 25 coaxially arranged through a seal sleeve assembly 3; the outside of the seal sleeve assembly 3 is fixed by screwing on the middle body 6, and the connecting flange 21 is fixed on the middle body 6 by screwing and passing through the seal sleeve assembly 3; the seal sleeve assembly 3 includes a seal sleeve main body 35, a valve stem bearing 34 fitted between the active valve stem 24 or the passive valve stem 25 inside the seal sleeve main body 35, a sealing ring 31 arranged between the seal sleeve main body 35 and the middle body 6 and the valve stem, a side sealing ring 32 arranged between the connecting flange 21 and the seal sleeve main body 35, and a flat gasket 33 arranged between the seal sleeve main body 35 and the hinge part 11. A sealing ring 31 and a flat gasket 33 are arranged between the valve stem bearing 34 and the valve chamber 52 to prevent the valve stem bearing 34 from contacting the slurry and ensure the cleanliness of its working environment. At the same time, an oil storage groove 22 is arranged inside the connecting flange 21, which can further ensure the lubrication of the valve stem bearing 34 and realize the full-life cycle maintenance-free of the valve stem bearing 34.

[0032] As Figure 5As shown, the flow channel 15 is provided with a V-shaped guide portion 12 concavely along the guide portion 14 on the inner side surface of the valve disc 1, and the cylindrical curved surface formed by the rotation of the V-shaped guide portion 12 takes the rotation axis (not marked in the figure) of the valve disc 1 as the central axis. The distance between the cylindrical curved surface and the central axis is L. Assuming that the flow channel section P1 of the valve cavity 52 has a flow area S1 and a slurry flow rate V1, and the flow channel section P2 at a distance L has a flow area S2 and a slurry flow rate V2, so that V2 = (1.1-1.2) V1, then according to S1·V1 = S2·V2, the distance L can be obtained. Specifically, the opening and closing of the valve is realized by the rotation of the V-shaped valve disc 1. When the V-shaped valve is opened, the valve cavity 52 is connected to the flow channel 15, and the flow direction of the slurry is changed by the valve disc 1. The slurry flow direction is V-shaped, and the sinking solid particles are washed away by the flow velocity of the slurry itself, avoiding the permanent deposition of solid particles in the slurry in the valve cavity, thereby realizing the self-cleaning function of the valve cavity.

[0033] In addition, it is further preferred that a first arc-shaped transition end 121 is provided between the V-shaped guide portion 12 and the drainage portion 14, and a second arc-shaped transition end 122 is provided between the V-shaped guide portions 12, so as to reduce the resistance of the slurry in the flow channel 15 as much as possible and avoid the deposition of solid particles at the corners.

[0034] The valve flap 1 flips upward to the upper part of the valve cavity 52 to open the valve, and the valve cavity 52 is connected with the flow channel 15. Due to the V-shaped structural characteristics of the valve flap 1 (its V-shaped size design ensures that when the valve is opened, the cross-sectional area of ​​the entire flow channel is basically the same, the flow velocity is basically unchanged, and the non-stagnation flow velocity characteristics in the slurry pipeline transportation are fully utilized), the original straight-line flow direction of the slurry is changed to a V-shape, and then the slurry's own flow velocity characteristics are used to flush away the sinking solid particles, thereby avoiding permanent deposition of solid particles in the slurry in the valve cavity 52, thereby achieving self-cleaning of the valve cavity 52.

[0035] The angle of the V-shaped guide portion 12 is 90°~120°, so that the solid particles in the guided slurry have sufficient kinetic energy, and can continue to flow along the flow channel 15, and avoid deposition in the valve cavity 52. ​​Furthermore, a reduced diameter structure is set at the V-shaped guide portion 12 of the valve cavity 52, so that the cross-sectional area of ​​the flow channel 15 at the V-shaped guide portion 12 is reduced. According to the Bernoulli equation, the pressure of the fluid at the "reduced diameter" is reduced, and the slurry forms a flow velocity difference upstream and downstream of the V-shaped guide portion. A local low-pressure area is formed at the V-shaped guide portion, and bubbles are formed in the valve cavity where solid particles are easily deposited, which continuously impact the inner wall of the valve cavity, further avoiding the deposition of solid particles in the valve cavity.

[0036] Preferably, the valve flap 1 is symmetrically arranged with respect to the vertical mirror plane F1 or the horizontal mirror plane F2, which is convenient for production and processing. When it is symmetrically arranged with respect to the vertical mirror plane F1, it is ensured that when the valve flap 1 is turned upwards to open or turned downwards to close, the force is more evenly distributed when the outer curved surface 13 contacts and cooperates with the inner surface of the valve seat 4, improving the sealing performance of the valve body. When it is symmetrically arranged with respect to the horizontal mirror plane F2, the slurry flow rates on the left and right sides of the flow channel 15 are the same when the valve flap 1 is opened, ensuring the stability of the flow channel 15.

[0037] The valve flap 1 is opened by turning upwards or downwards. When the valve flap 1 is opened by turning downwards, it will accelerate the attachment of sediments in the slurry to the inner surface of the valve flap 1, affecting its performance. Therefore, preferably, the valve flap 1 is turned upwards.

[0038] Explanation of reference numerals: 1 valve flap, 11 hinge part, 12 V-shaped flow guiding part, 121 first arc transition end, 122 second arc transition end, 13 spherical outer wall, 131 end face, 14 drainage part, 15 flow channel;

[0039] 2 valve stem assembly, 21 connecting flange, 22 oil storage tank, 23 inner flange seal ring, 24 active valve stem, 25 passive valve stem;

[0040] 3 seal sleeve assembly, 31 seal ring, 32 side seal ring, 33 flat gasket, 34 valve stem bearing, 35 seal sleeve body,

[0041] 4 valve seat;

[0042] 5 side body, 51 spring, 52 valve cavity;

[0043] 6 middle body.

Claims

1. A self-cleaning V-shaped slurry ball valve, comprising a side body (5), a valve seat (4) slidably limited on the side body (5), a valve stem assembly (2) rotatably arranged on a middle body (6), and a valve flap (1) rotating in cooperation with the valve stem assembly (2), characterized in that: The valve flap (1) is spherical wedge-shaped and comprises a spherical outer wall (13), a hinged portion (11) matched with the valve stem assembly (2), and a flow channel (15) arranged on the inner side of the valve flap (1) and intersecting with the rotation axis; the flow channel (15) is provided with a V-shaped guide portion (12) concavely arranged along the guide portion (14) on the inner side surface of the valve flap (1), and the columnar curved surface formed by the rotation of the V-shaped guide portion (12) takes the rotation axis of the valve flap (1) as the central axis.

2. The self-cleaning V-shaped slurry ball valve according to claim 1, characterized in that: The valve flap (1) opens by flipping upward.

3. The self-cleaning V-shaped slurry ball valve according to claim 1, characterized in that: A first arc-shaped transition end (121) is provided between the V-shaped flow guiding portion (12) and the flow guiding portion (14), and a second arc-shaped transition end (122) is provided between the V-shaped flow guiding portions (12).

4. The self-cleaning V-shaped slurry ball valve according to claim 1, characterized in that: The included angle of the V-shaped flow guide portion (12) is 90° to 120°.

5. The self-cleaning V-shaped slurry ball valve according to claim 1, characterized in that: The cross-sectional shape of the V-shaped flow guide portion (12) is arc-shaped or trapezoidal.

6. The self-cleaning V-shaped slurry ball valve according to any one of claims 1 to 5, characterized in that: The valve disc (1) is arranged symmetrically with respect to a horizontal or vertical mirror plane (F1 or F2).

7. The self-cleaning V-shaped slurry ball valve according to claim 1, characterized in that: The valve stem assembly (2) comprises an active valve stem (24) and a passive valve stem (25) which are coaxially arranged through a sealing sleeve assembly (3); the outer side of the sealing sleeve assembly (3) is fixed on the middle body (6) by screwing, and the connecting flange (21) is fixed on the middle body (6) by screwing and passing through the sealing sleeve assembly (3); the sealing sleeve assembly (3) comprises a sealing sleeve body (35), a valve stem bearing (34) fitted between the active valve stem (24) or the passive valve stem (25) in the sealing sleeve body (35), a sealing ring (31) arranged between the sealing sleeve body (35) and the middle body (6) and the valve stem, a side sealing ring (32) arranged between the connecting flange (21) and the sealing sleeve body (35), and a plane sealing gasket (33) arranged between the sealing sleeve body (35) and the hinged portion (11).

8. The self-cleaning V-shaped slurry ball valve according to claim 1, characterized in that: An annular closed cavity is formed between the back side of the valve seat (4) and the side body (5), and a plurality of identical compression springs (51) are evenly distributed in the cavity to provide sealing force.

9. The self-cleaning V-shaped slurry ball valve according to claim 8, characterized in that: An annular closed cavity is formed between the back side of the valve seat (4) and the side body (5), or a sealing force is provided by connecting the annular closed cavity to an external hydraulic system.

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