Top-mounted C-shaped wear-resistant ball valve

Abstract

The top-mounted C-shaped wear-resistant ball valve comprises a valve body, an open type flow channel structure is arranged in the valve body, the open type flow channel structure comprises an upstream end, a downstream end and an oval valve cavity, a valve seat is arranged on the side, close to the upstream end, in the valve cavity, and the sealing face of the valve seat is arranged back to the flow direction of a medium; a C-shaped ball body is further arranged in the valve body, the rotation center of the C-shaped ball body and the geometric center of the sealing face of the C-shaped ball body are arranged in an eccentric mode, the rotation center of the C-shaped ball body and the circulation center line of the valve seat are arranged in an eccentric mode, and in the process from opening to closing of the valve, the valve seat moves slightly along a flow channel. The C-shaped ball body generates double-vector cam motion of rotation and translation and is matched with the valve seat to achieve cam wedge-caulking type torque sealing, the double-vector cam wedge-caulking type torque sealing valve can be suitable for key stations with large calibers and large pressure differences, the opening and closing torque is small, and the service life is long.

Description

Technical Field

[0001] The invention relates to a top-mounted C-shaped wear-resistant ball valve. Background Art

[0002] With the rapid development of industries such as petrochemicals, electric power, coal chemical industry, and polysilicon, the technology is becoming more and more advanced, the working conditions are becoming more and more demanding, and the requirements for energy conservation and emission reduction are becoming higher and higher. Under certain harsh working conditions, the service life of traditional metal hard-sealed ball valves is greatly shortened due to scouring and abrasion. However, due to its special opening and closing structure, the C-shaped ball valve is particularly suitable for harsh working conditions such as particles, viscosity, scouring, crystallization, scaling, and wear.

[0003] Taking the inlet and outlet cut-off of the coal chemical quenching water pump as an example, in order to ensure the normal operation of the gasification device, a C-shaped wear-resistant ball valve is installed at the inlet and outlet of the quenching water pump. The service life is five times that of the traditional metal hard-sealed ball valve, which significantly improves the economic benefits.

[0004] However, the existing C-shaped wear-resistant ball valves still have the following problems: the overall product level is low and can only be used for non-main and non-critical workstations with small diameters and low pressure differences; the force torque and resistance when the valve is opened and closed are large, the C-shaped ball and valve seat are severely worn, and there is still much room for improvement in the service life. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a top-mounted C-shaped wear-resistant ball valve which can be used in key workstations with large diameters and large pressure differences, has a small opening and closing torque and a longer service life.

[0006] The technical solution of the present invention is: a top-mounted C-shaped wear-resistant ball valve, comprising a valve body, wherein the valve body is provided with an open flow channel structure;

[0007] The open flow channel structure comprises an upstream end, a downstream end and an elliptical valve cavity arranged between the upstream end and the downstream end, and the inner surface of the valve body is streamlined;

[0008] A valve seat is provided on one side of the valve cavity near the upstream end, and the sealing surface of the valve seat is arranged opposite to the flow direction of the medium. A C-shaped sphere is also provided in the valve body, and the rotation center of the C-shaped sphere is eccentrically arranged with respect to the geometric center of the sealing surface of the C-shaped sphere, and the rotation center of the C-shaped sphere is also eccentrically arranged with respect to the flow center line of the valve seat;

[0009] When the valve is opened and closed, the valve seat moves slightly along the flow channel, and the C-shaped sphere generates a double-vector cam motion of rotation and translation, and cooperates with the valve seat to realize a cam wedge-tightening torque seal;

[0010] When the valve is opened from closed, the C-shaped ball rotates and instantly leaves the valve seat;

[0011] When the valve is fully closed, the valve torque increases;

[0012] When the valve is fully opened, the sealing surface of the C-shaped ball keeps a distance from the inner wall of one side of the valve cavity. Most of the medium directly passes through the channel of the C-shaped ball, and a small part of the medium flows between the sealing surface of the C-shaped ball and the inner wall of the valve cavity, which fully flushes the C-shaped ball.

[0013] When the sealing surface of the C-shaped sphere approaches the valve seat, the sealing surface of the C-shaped sphere scrapes the surface particles of the valve seat.

[0014] Furthermore, the valve seat includes a baffle, a sealing ring, a pre-tightening disc spring and an ash removal ring. The ash removal ring is arranged between the pre-tightening disc spring and the valve body, and an ash removal groove is provided on the ash removal ring.

[0015] Specifically, the downstream end and the valve cavity are connected in an arc-shaped transition.

[0016] Furthermore, the upper and lower ends of the C-shaped sphere are respectively provided with connecting holes, and the two connecting holes are respectively connected to the upper valve stem and the lower valve stem.

[0017] Furthermore, a valve cover is provided on the top of the valve body.

[0018] Furthermore, a bottom cover is provided at the bottom of the valve body.

[0019] Furthermore, the upper end of the upper valve stem passes through the valve cover and is connected to a worm gear box, and the worm gear box is also provided with a hand wheel.

[0020] Furthermore, a bracket is fixed to the upper end of the valve cover, and the worm gear box is connected to the bracket.

[0021] Furthermore, a packing layer is provided at the connection between the upper valve stem and the valve body, and the packing layer is limited in the valve cover by a packing sleeve and a packing pressure plate.

[0022] Furthermore, a pair of supporting feet are provided at the bottom of the valve body.

[0023] The beneficial effects of the present invention are:

[0024] 1. The sealing surface of the valve seat is set against the medium flow direction, which can prevent the medium from directly eroding the valve seat sealing surface and effectively extend the service life of the valve;

[0025] 2. The double eccentric design of the C-shaped sphere makes the valve stem deviate on two planes when the valve is closed. The C-shaped sphere produces a double vector cam motion of rotation + translation, realizing a cam wedge-tight torque seal with reliable sealing;

[0026] 3. The valve seat can only move slightly along the flow channel. When the valve is opened from closed, the eccentric C-shaped ball will instantly leave the valve seat as soon as it rotates. At this time, the torque on the valve stem is only the friction torque between the packing and the valve and the friction torque between the valve and the bearing. These two torques are very small, and the resistance to opening the valve is very low, which can achieve the effect of micro-torque.

[0027] On the contrary, when the valve is opened and closed, the pressure difference between the inlet and outlet of the valve can be ignored. At this time, the torque on the valve stem is only the friction torque between the packing and the valve and the friction torque between the valve and the bearing. These two torques are very small, and the resistance of the valve closing action is very low. Only when the valve is completely closed, the valve torque suddenly increases. The greater the valve closing force, the better the valve sealing effect.

[0028] 4. When the valve is closed, the C-shaped ball and the valve seat generate a cam-tight torque seal. The power of the torque seal comes from the handle, gear, and actuator. From the mechanical principle, it ensures that the valve is tightly shut off without relying on springs or process pressure. Therefore, the C-shaped ball hardly touches the valve seat during the switching process. The small amount of friction or frictionless rotation reduces the wear of the valve seat sealing surface and extends the service life of the valve seat.

[0029] 5. When the valve is opened, the sealing surface of the C-shaped ball keeps a distance from the inner wall of one side of the valve cavity. The medium does not flush the sealing surface of the valve seat head-on. Most of the medium directly passes through the channel of the C-shaped ball, while a small part of the medium flows between the sealing surface of the C-shaped ball and the inner wall of the valve cavity, fully flushing the C-shaped ball and washing away all the attachments on the C-shaped ball.

[0030] When the C-shaped ball approaches the valve seat, the sealing surface of the C-shaped ball scrapes away particles on the valve seat surface, reducing the abrasion of the valve seat and further extending the service life of the valve seat.

[0031] 6. An ash discharge ring is set between the preload disc spring and the valve body. Under pressure, the solid powder can be discharged smoothly from the ash discharge groove, which can prevent the preload disc spring from failing due to the accumulation of solid particles and improve the reliability of the valve action. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a longitudinal cross-sectional view of the present invention;

[0033] Figure 2 It is a structural schematic diagram of one side of the present invention;

[0034] Figure 3 is a cross-sectional view of the present invention in a transverse direction;

[0035] Figure 4 A schematic diagram of the structure of the C-shaped sphere in the present invention;

[0036] Figure 5It is a structural schematic diagram of the valve seat in the present invention.

[0037] In the figure: valve body 1, upstream end 2, downstream end 3, valve cavity 4, valve seat 5, C-shaped sphere 6, baffle 7, sealing ring 8, preloaded disc spring 9, ash removal ring 10, connecting hole 11, upper valve stem 12, lower valve stem 13, valve cover 14, bottom cover 15, worm gear box 16, handwheel 17, bracket 18, packing layer 19, supporting foot 20. DETAILED DESCRIPTION

[0038] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0039] Combination Figure 1-5 As shown, a top-mounted C-shaped wear-resistant ball valve comprises a valve body 1, wherein the valve body 1 is provided with an open flow channel structure;

[0040] The open flow channel structure includes an upstream end 2 (medium inflow direction), a downstream end 3 (medium outflow direction) and an elliptical valve cavity 4 arranged between the upstream end 2 and the downstream end 3. The inner surface of the valve body 1 is streamlined, without any right angles or dead angles, and has low resistance.

[0041] A valve seat 5 is provided on one side of the valve cavity 4 near the upstream end 2, and the sealing surface of the valve seat 5 is arranged opposite to the medium flow direction. A C-shaped sphere 6 is also provided in the valve body 1, and the rotation center (axis center) of the C-shaped sphere 6 is eccentrically arranged with the geometric center (spherical crown center) of the sealing surface of the C-shaped sphere 6, and the rotation center of the C-shaped sphere 6 is also eccentrically arranged with the flow center line of the valve seat 5;

[0042] The sealing surface of the valve seat 5 is arranged to face away from the medium flow direction, which can prevent the medium from directly scouring the sealing surface of the valve seat 5 and effectively extend the service life of the valve;

[0043] The double eccentric design of the C-shaped ball 6 makes the valve stem deflect on two planes when the valve is closed. The C-shaped ball 6 generates a double vector cam motion of rotation + translation, realizing a cam wedge-tight torque seal with reliable sealing.

[0044] Since the valve seat 5 is arranged at the upstream end 2 of the open flow channel structure, the sealing surface of the valve seat 5 is arranged opposite to the flow direction of the medium. During the valve opening and closing process, the valve seat 5 can only move slightly along the flow channel.

[0045] When the valve is opened from closed, the eccentric C-shaped ball 6 will instantly separate from the valve seat 5 as soon as it rotates. At this time, the torque on the valve stem is only the friction torque between the packing and the valve and the friction torque between the valve and the bearing. These two torques are very small, and the resistance to the valve opening action is very low, which can achieve a micro-torque effect.

[0046] On the contrary, when the valve is opened and closed, the pressure difference between the inlet and outlet of the valve can be ignored. At this time, the torque on the valve stem is only the friction torque between the packing and the valve and the friction torque between the valve and the bearing. These two torques are very small, and the resistance of the valve closing action is very low. Only when the valve is completely closed, the valve torque suddenly increases. The greater the valve closing force, the better the valve sealing effect.

[0047] It should be noted that when the valve is closed, the C-shaped ball 6 and the valve seat 5 generate a cam-tight torque seal. The power of the torque seal comes from the handle, gear, and actuator, which ensures that the tight shutoff is achieved without relying on springs or process pressure from a mechanical principle. Therefore, during the switching process, the C-shaped ball 6 hardly contacts the valve seat 5, and a small amount of friction or no friction rotation reduces the wear of the sealing surface of the valve seat 5, thereby extending the service life of the valve seat 5.

[0048] When the valve is opened, the sealing surface of the C-shaped ball 6 maintains a distance from the inner wall of one side of the valve cavity 4, and the medium does not face the sealing surface of the valve seat 5. Most of the medium directly passes through the channel of the C-shaped ball 6, and a small part of the medium flows between the sealing surface of the C-shaped ball 6 and the inner wall of the valve cavity 4, which fully flushes the C-shaped ball 6 and washes away all the attachments on the C-shaped ball 6;

[0049] When the C-shaped ball 6 approaches the valve seat 5, the sealing surface of the C-shaped ball 6 scrapes away particles on the surface of the valve seat 5, reducing the abrasion of the valve seat 5 and further extending the service life of the valve seat 5;

[0050] In another embodiment, in combination Figure 1 , Figure 3 and Figure 5 As shown, the valve seat 5 includes a baffle 7, a sealing ring 8, a preload disc spring 9 and an ash removal ring 10. The ash removal ring 10 is arranged between the preload disc spring 9 and the valve body 1, and an ash removal groove is provided on the ash removal ring 10;

[0051] The conventional design is that the inner diameter end face of the butterfly spring is pressed on the valve body 1, and the outer diameter end face is pressed on the pressure ring of the sealing ring 8. A closed space will be formed between the butterfly spring and the valve body 1. After long-term use, the space will be filled with solid particles or powder, and the butterfly spring will not be able to be pressed flat on the pressure ring of the sealing ring 8. The entire circle of the sealing ring 8 will be unevenly stressed, affecting the sealing performance of the valve. The above structure can smoothly discharge the solid powder from the ash discharge chute under pressure, prevent the pre-tightened butterfly spring from failing due to the accumulation of solid particles and jamming, and improve the reliability of the valve action.

[0052] In another embodiment, in combination Figure 1 and Figure 3 As shown, the downstream end 3 and the valve cavity 4 are connected by an arc-shaped transition.

[0053] In another embodiment, in combination Figure 1 and Figure 4 As shown, the upper and lower ends of the C-shaped sphere 6 are respectively provided with connecting holes 11, and the two connecting holes 11 are respectively connected to the upper valve stem 12 and the lower valve stem 13.

[0054] In another embodiment, if Figure 1 As shown, a valve cover 14 is also provided on the top of the valve body 1 to facilitate the assembly of the upper valve stem 12 .

[0055] In another embodiment, if Figure 1 As shown, a bottom cover 15 is also provided at the bottom of the valve body 1 to facilitate the assembly of the lower valve stem 13 .

[0056] In another embodiment, if Figure 1 As shown, the upper end of the upper valve stem 12 passes through the valve cover 14 and is connected to a worm gear box 16 , and a hand wheel 17 is also provided on the worm gear box 16 .

[0057] In another embodiment, a bracket 18 is fixed to the upper end of the valve cover 14 , and the worm gear box 16 is connected to the bracket 18 .

[0058] In another embodiment, if Figure 1 As shown, a packing layer 19 is further provided at the connection between the upper valve stem 12 and the valve body 1 , and the packing layer 19 is limited in the valve cover 14 by a packing gland and a packing plate.

[0059] In another embodiment, if Figure 1 As shown, a pair of supporting feet 20 are also provided at the bottom of the valve body 1 .

Claims

1. A top-entry C-shaped wear-resistant ball valve, comprising a valve body (1), characterized in that: The valve body (1) is provided with an open flow channel structure; The open flow channel structure comprises an upstream end (2), a downstream end (3) and an elliptical valve cavity (4) arranged between the upstream end (2) and the downstream end (3), and the inner surface of the valve body (1) is streamlined; A valve seat (5) is provided on one side of the valve cavity (4) close to the upstream end (2), and the sealing surface of the valve seat (5) is arranged opposite to the flow direction of the medium. A C-shaped sphere (6) is also provided in the valve body (1), and the rotation center of the C-shaped sphere (6) is eccentrically arranged with respect to the geometric center of the sealing surface of the C-shaped sphere (6), and the rotation center of the C-shaped sphere (6) is also eccentrically arranged with respect to the flow center line of the valve seat (5); When the valve is opened and closed, the valve seat (5) moves slightly along the flow channel, and the C-shaped sphere (6) generates a double-vector cam motion of rotation and translation, and cooperates with the valve seat to realize a cam wedge-tightening torque seal; When the valve is opened from closed, the C-shaped ball (6) rotates and instantly leaves the valve seat (5); When the valve is fully closed, the valve torque increases; When the valve is fully opened, the sealing surface of the C-shaped ball (6) maintains a distance from the inner wall of one side of the valve cavity (4), and most of the medium directly passes through the channel of the C-shaped ball (6), and a small part of the medium flows between the sealing surface of the C-shaped ball (6) and the inner wall of the valve cavity (4), thereby fully flushing the C-shaped ball (6); When the sealing surface of the C-shaped sphere (6) approaches the valve seat (5), the sealing surface of the C-shaped sphere (6) scrapes away particles on the surface of the valve seat (5).

2. A top-entry C-shaped wear-resistant ball valve as claimed in claim 1, characterized in that: The valve seat (5) comprises a baffle (7), a sealing ring (8), a preload disc spring (9) and an ash removal ring (10); the ash removal ring (10) is arranged between the preload disc spring (9) and the valve body (1); and an ash removal groove is provided on the ash removal ring (10).

3. A top-entry C-shaped wear-resistant ball valve as claimed in claim 2, characterized in that: The downstream end (3) and the valve cavity (4) are connected in an arc-shaped transition.

4. A top-entry C-shaped wear-resistant ball valve as claimed in claim 3, characterized in that: The upper and lower ends of the C-shaped sphere (6) are respectively provided with connection holes (11), and the two connection holes (11) are respectively connected to the upper valve stem (12) and the lower valve stem (13).

5. A top-entry C-shaped wear-resistant ball valve as claimed in claim 4, characterized in that: A valve cover (14) is also provided on the top of the valve body (1).

6. A top-entry C-shaped wear-resistant ball valve as claimed in claim 5, characterized in that: A bottom cover (15) is also provided at the bottom of the valve body (1).

7. A top-entry C-shaped wear-resistant ball valve as claimed in claim 6, characterized in that: The upper end of the upper valve stem (12) passes through the valve cover (14) and is connected to a worm gear box (16). The worm gear box (16) is also provided with a hand wheel (17).

8. A top-entry C-shaped wear-resistant ball valve as claimed in claim 7, characterized in that: A bracket (18) is also fixed to the upper end of the valve cover (14), and the worm gear box (16) is connected to the bracket (18).

9. A top-entry C-shaped wear-resistant ball valve as claimed in claim 8, characterized in that: A packing layer (19) is also provided at the connection between the upper valve stem (12) and the valve body (1), and the packing layer (19) is limited in position in the valve cover (14) by a packing sleeve and a packing pressure plate.

10. A top-entry C-shaped wear-resistant ball valve as claimed in claim 9, characterized in that: A pair of supporting feet (20) is also provided at the bottom of the valve body (1).

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