A top entry ball valve

Abstract

The present invention relates to the field of ball valves, and in particular to a top-mounted ball valve. The technical problem is: in the prior art, the water hammer effect causes damage to the valve, and the medium remains in the valve body, affecting the normal use of the valve body. The technical solution is: a top-mounted ball valve, including valve seat one, valve seat two and a valve body; the valve seat one and the valve seat two are connected with the valve body. The present invention introduces part of the medium into the temporary storage cavity during the rotation of the valve core, so that the flow speed of the medium in the pipeline is slowly reduced, effectively avoiding the rapid rotation of the valve core, the water hammer effect causing impact damage to the ball valve, and when the ball valve is reopened, the medium flows quickly in the valve seat two, and the medium in the temporary storage cavity can be discharged to the valve seat two through the reflux pipe, and the medium in the temporary storage cavity is discharged to achieve medium recovery.

Description

Technical Field

[0001] The invention relates to the field of ball valves, and in particular to a top-mounted ball valve. Background Art

[0002] Ball valves are not only widely used in general working media such as water, solvents, acids and natural gas, but also suitable for the transportation of high-temperature or low-temperature media.

[0003] When the existing valve is closed suddenly, it is easy to cause water hammer in the pipeline. The impact of water flow will cause great damage to the valve and cause pipe burst. If the valve is closed slowly, the medium in the pipeline will enter the valve body and accumulate in the valve body. If there are impurities in the medium, the maintenance cost of valve cleaning will increase, and it will also affect the normal opening and closing of the valve body, causing the valve to be stuck and the valve to be unable to be used normally, affecting the normal transportation of the medium. Summary of the invention

[0004] The technical problems of the present invention are:

[0005] In order to overcome the shortcomings of the prior art that the water hammer effect causes damage to the valve and the medium remains in the valve body, affecting the normal use of the valve body, the present invention provides a top-entry ball valve.

[0006] The technical solution is: a top-mounted ball valve, comprising valve seat one, valve seat two and a valve body; the valve body is connected between valve seat one and valve seat two; it also comprises a valve cover, a valve stem, a handwheel, a valve core, a positioning rod, a limit plate and a sealing ring; the valve body is detachably connected to the valve cover; the valve cover is rotatably connected to the valve stem; the valve stem is fixedly connected to the handwheel; the valve stem is plugged with the valve core; a packing sealing layer is detachably connected between the valve cover and the valve core; the lower part of the valve core is rotatably connected to the valve body; two positioning rods are fixedly connected to the left and right parts of the valve body respectively; a limit plate is detachably connected between the two positioning rods on the left; another limit plate is detachably connected between the two positioning rods on the right; all the limit plates are in contact with the packing sealing layer; each limit plate is fixedly connected to a sealing ring; the valve core is in contact with the corresponding sealing ring.

[0007] As an improvement of the above solution, a circular clamping ring is provided at the lower part of the valve stem, and the circular clamping ring is located between the packing sealing layer and the valve cover, and is used to press the valve stem onto the valve core.

[0008] As an improvement of the above scheme, it also includes a return pipe; a temporary storage cavity is reserved between the valve core and the valve body; the temporary storage cavity is connected to the return pipe; and the return pipe is connected to the second valve seat.

[0009] As an improvement of the above solution, the return pipe is connected to the valve seat 2 at an angle.

[0010] As an improvement of the above scheme, it also includes a breathing valve and a drain valve; the temporary storage chamber is connected to the breathing valve; the temporary storage chamber is connected to the drain valve.

[0011] As an improvement of the above scheme, it also includes a mounting plate, a support rod and a sealing sheet; the mounting plate is fixedly connected in the return pipe; the mounting plate is detachably connected to the support rod; the sealing sheet is fixedly connected to the support rod; and the sealing sheet contacts the inner wall of the return pipe.

[0012] As an improvement of the above solution, it also includes a limiting ring; the limiting ring is fixedly connected in the return pipe; and the limiting ring is in contact with the sealing sheet.

[0013] As an improvement of the above solution, a through groove is formed on the sealing sheet, and the through groove is perpendicular to the axial direction of the sealing sheet.

[0014] As an improvement of the above solution, fins are also included; a plurality of fins are fixedly connected to the outer wall of the valve body.

[0015] As an improvement of the above solution, the fins are distributed in an array along the outer wall of the valve body, the fins are in a concentric circle state, and a plurality of transverse heat dissipation channels are opened on the fins.

[0016] The beneficial effects are: 1. The present invention introduces part of the medium into the temporary storage chamber during the rotation of the valve core, so that the flow speed of the medium in the pipeline decreases slowly, effectively avoiding the rapid rotation of the valve core and the water hammer effect causing impact damage to the ball valve. When the ball valve is reopened, the medium flows rapidly in the valve seat two, and the medium in the temporary storage chamber can be discharged into the valve seat two through the reflux pipe, thereby discharging the medium in the temporary storage chamber and realizing medium recovery.

[0017] 2. By arranging a sealing sheet in the reflux pipe, the width of the flow path of the medium in the reflux pipe is reduced, the flow velocity of the medium passing through it is accelerated, and the pressure at the gap is reduced. When combined with the low pressure at the mouth of the reflux pipe, a stronger suction force is generated on the medium in the temporary storage chamber, so that the medium in the temporary storage chamber is fully sucked out. In combination with the limit ring, when the sealing sheet contacts the limit ring, the medium in the valve seat 2 is prevented from flowing back when the flow velocity suddenly decreases, and the medium is re-injected into the temporary storage chamber, resulting in a large amount of medium accumulation in the temporary storage chamber.

[0018] 3. By arranging a number of fins on the outside of the valve body, the fins are arranged along the curved surface of the lower part of the valve body, so that the fins are in more complete contact with the air, effectively improving the heat exchange efficiency of the fins. In addition, transverse heat dissipation channels are opened on the fins. When the air flows toward the fin array, the air can also be diverted to both sides when passing through the transverse heat dissipation channels, thereby achieving sufficient heat exchange of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a first three-dimensional structure of a top-entry ball valve of the present invention;

[0020] Figure 2It is a schematic diagram of a second three-dimensional structure of the top-entry ball valve of the present invention;

[0021] Figure 3 It is a schematic diagram of the internal structure of the valve body of the present invention;

[0022] Figure 4 It is a schematic diagram of the internal structure of the reflux pipe of the present invention;

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the mounting plate and the sealing sheet of the present invention;

[0024] Figure 6 It is a schematic diagram of the cooperation between the sealing sheet and the limiting ring of the present invention.

[0025] The numbers in the figure are as follows: 1-valve seat 1, 2-valve seat 2, 3-valve body, 4-valve cover, 5-valve stem, 6-handwheel, 7-valve core, 8-positioning rod, 9-limiting plate, 10-sealing ring, 101-reflux pipe, 102-breathing valve, 103-drain valve, 3001-temporary storage chamber, 201-mounting plate, 202-support rod, 203-sealing sheet, 204-limiting ring, 301-fin. DETAILED DESCRIPTION

[0026] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Embodiment 1

[0028] A top-entry ball valve, according to Figure 1-Figure 5 As shown, it includes a valve seat 1, a valve seat 2 and a valve body 3; the valve seat 1 and the valve seat 2 are connected with the valve body 3;

[0029] It also includes a valve cover 4, a valve stem 5, a hand wheel 6, a valve core 7, a positioning rod 8, a limit plate 9 and a sealing ring 10; the valve body 3 is detachably connected to the valve cover 4; the valve cover 4 is rotatably connected to the valve stem 5; the hand wheel 6 is fixedly connected to the upper part of the valve stem 5; the valve core 7 is inserted into the lower part of the valve stem 5; a packing sealing layer is detachably connected between the valve cover 4 and the valve core 7; the lower part of the valve core 7 is rotatably connected to the valve body 3; two positioning rods 8 are fixedly connected to the left and right parts of the valve body 3 respectively; a limit plate 9 is detachably connected between the two positioning rods 8 on the left; another limit plate 9 is detachably connected between the two positioning rods 8 on the right; all the limit plates 9 are in contact with the packing sealing layer; each limit plate 9 is fixedly connected to a sealing ring 10, and the sealing ring 10 is made of elastic material; the valve core 7 is in contact with the corresponding sealing ring 10.

[0030] A circular clamping ring is provided at the lower part of the valve stem 5 . The circular clamping ring is located between the packing sealing layer and the valve cover 4 and is used to press the valve stem 5 onto the valve core 7 .

[0031] It also includes a return pipe 101; a temporary storage chamber 3001 is left between the valve core 7 and the valve body 3; the lower part of the temporary storage chamber 3001 is connected to the return pipe 101; the return pipe 101 is connected to the valve seat 2.

[0032] The return pipe 101 is connected to the valve seat 2 at an angle.

[0033] It also includes a breathing valve 102 and a drain valve 103; the upper part of the temporary storage chamber 3001 is connected to the breathing valve 102; the lower part of the temporary storage chamber 3001 is connected to the drain valve 103.

[0034] It also includes a mounting plate 201 , a support rod 202 and a sealing sheet 203 ; the mounting plate 201 is fixedly connected inside the return pipe 101 ; the mounting plate 201 is detachably connected to the support rod 202 ; the sealing sheet 203 is fixedly connected to the support rod 202 ; the sealing sheet 203 contacts the inner wall of the return pipe 101 .

[0035] The limiting ring 204 is also included; the limiting ring 204 is fixedly connected in the return pipe 101; the limiting ring 204 is located between the sealing sheet 203 and the mounting plate 201; the limiting ring 204 is in contact with the sealing sheet 203.

[0036] The sealing sheet 203 is provided with two symmetrical through grooves, which are perpendicular to the axial direction of the sealing sheet 203 .

[0037] The working steps of the above embodiment are:

[0038] First, connect the valve seat 1 and the valve seat 2 with the pipeline through the flanges thereon, and by turning the handwheel 6, the handwheel 6 drives the valve stem 5 to drive the valve core 7 to rotate until the center hole of the valve core 7 is connected with the center holes of the valve seat 1 and the valve seat 2, respectively. At this time, the medium in the pipeline can pass through the valve seat 1, the valve core 7 and the valve seat 2 in sequence, and then flow out to the pipeline, thereby realizing the connection between the valve seat 1 and the valve seat 2. This is the open state of the ball valve, and the medium passes through the ball valve. Then, when the ball valve needs to be closed, it is only necessary to turn the handwheel 6 ninety degrees, and the sealing surface of the valve core 7 rotates to the position of the valve seat 1 and the valve seat 2, and the connection between the valve seat 1 and the valve seat 2 is disconnected, and the medium cannot pass through the ball valve.

[0039] Since the valve core 7 is a sphere with a center hole in the sphere, an elastic sealing ring 10 is provided on each limit plate 9, and the facing sides of the sealing rings 10 are tightly attached to the spherical surface of the valve core 7. When the valve core 7 is in an open state, the inner diameter of the sealing ring 10 is equal to the outer diameter of the center hole of the valve core 7, which effectively avoids the existence of a gap between the valve core 7 and the two sealing rings 10 when the valve core 7 is in an open state, resulting in a large amount of medium flowing out of the temporary storage chamber 3001, which is easy to cause leakage or bursting at the valve body 3.

[0040] And in actual use, in order to avoid closing the ball valve quickly, the flow of the medium in the pipeline is suddenly blocked, resulting in a water hammer effect in the pipeline and damaging the ball valve. Therefore, the ball valve needs to be closed slowly. In the process of slowly closing the ball valve, when the center hole of the valve core 7 is offset from the center hole of the sealing ring 10, the valve seat 1 is connected to the temporary storage chamber 3001 through the center hole of the sealing ring 10. Therefore, when the ball valve is not completely closed, part of the medium in the valve seat 1 enters the temporary storage chamber 3001, and part of the medium continues to enter the valve seat 2 through the valve core 7. As the valve core 7 rotates, the connection between the center hole of the valve seat 1 and the temporary storage chamber 3001 is The opening first increases and then decreases until the center hole of the valve core 7 is completely offset from the center hole of the sealing ring 10, and the ball valve is completely closed, so that the medium in the valve seat 1 gradually decreases in flow at the valve core 7 during the slow rotation of the valve core 7, until there is no flow at last, and no water hammer effect will be generated in the pipeline, causing less damage to the ball valve. Compared with the prior art, when dealing with the influence of the water hammer effect on the ball valve, maintenance measures such as a pressure reducing valve, a backflow device or an attenuator are generally installed at the corresponding position of the pipeline. However, after the relevant maintenance measures are installed in the pipeline, not only the flow of the medium in the pipeline is affected, but also the use cost and maintenance cost are greatly increased.

[0041] Then, when the ball valve is reopened, the medium in the valve seat 1 enters the valve seat 2 through the center hole of the valve core 7. Based on the Bernoulli principle, the medium has a low pressure at a place with a high flow rate and a high pressure at a place with a low flow rate. Therefore, when the medium flows rapidly in the valve seat 2, the medium flows through the orifice of the return pipe 101, so that the pressure at the return pipe 101 is low, and then the medium in the temporary storage chamber 3001 is pressed into the valve seat 2 through the return pipe 101, and the return pipe 101 is tilted to connect to the valve. The valve seat 22 forms a Y-shaped tee. At the interface between the return pipe 101 and the valve seat 22, the flow resistance of the medium is small, the medium flows smoothly, and it is convenient to fully discharge the medium in the temporary storage chamber 3001. A sealing sheet 203 with a through groove is also provided in the return pipe 101. When the medium flows in the valve seat 22, the medium in the temporary storage chamber 3001 flows along the return pipe 101 to the valve seat 22. When the medium passes through the sealing sheet 203, the portion of the sealing sheet 203 with the through groove is bent and deformed, such as Figure 6As shown in the lower figure, the medium flows from the gap between the raised sealing sheet 203 and the return pipe 101 to the valve seat 2, so that the flow path width of the medium in the return pipe 101 is reduced. According to the Bernoulli principle, the gap between the raised sealing sheet 203 and the return pipe 101 is smaller than the inner diameter of the return pipe 101. When the medium passes through the gap, the flow velocity of the medium is accelerated, and the pressure at the mouth of the return pipe 101 is further reduced, which generates a stronger suction force on the medium in the temporary storage chamber 3001, so that the medium in the temporary storage chamber 3001 is fully sucked out. When the ball valve is closed, the flow velocity of the medium in the valve seat 2 is sharply reduced, and the pressure at the mouth of the return pipe 101 increases. The return pipe 101 no longer sucks the medium from the temporary storage chamber 3001, and the sealing sheet 203 is restored. Figure 6 As shown in the upper middle figure, in order to prevent the medium in the valve seat 22 from being completely discharged when the flow velocity suddenly decreases, the valve seat 22 flows back, and the medium in the valve seat 22 flows back into the reflux pipe 101. At this time, the sealing piece 203 abuts against the limit ring 204 to block the medium flowing back into the reflux pipe 101, thereby preventing the medium from accumulating in large quantities in the temporary storage chamber 3001.

[0042] When the ball valve needs to be maintained, first close the ball valve, then open the breathing valve 102 and the drain valve 103 in turn, and place a collection bucket under the drain valve 103 to collect the medium to prevent the medium from polluting the surrounding environment. After the medium in the temporary storage chamber 3001 is emptied, remove the fixing bolts on the valve body 3 and the valve cover 4, and then lift the valve cover 4, the valve stem 5 and the hand wheel 6 upward together, and then take out the packing sealing layer between the valve body 3 and the valve cover 4, and then remove the two limit plates. 9 is pulled upward together, and the limit plate 9 drives the sealing ring 10 and the valve core 7 to move upward, so that the valve core 7 can be taken out and cleaned and maintained, and various places in the temporary storage chamber 3001 can be cleaned and maintained. The waste water after cleaning is still discharged by the drain valve 103. At this time, the waste liquid bucket is placed under the drain valve 103 to collect the waste liquid. Therefore, there is no need to disassemble the fixing bolts of the flanges on the valve seat 1 and the valve seat 2, and the ball valve can be cleaned and maintained. The operation is simple and convenient, which greatly improves the maintenance efficiency.

[0043] Second embodiment

[0044] On the basis of the first embodiment, according to Figure 1 and Figure 2 As shown, fins 301 are also included; a plurality of fins 301 are fixedly connected to the outer wall of the valve body 3 .

[0045] The fins 301 are distributed in an array along the outer wall of the valve body 3 . The fins 301 are in a concentric circle state. A plurality of transverse heat dissipation channels are opened on the fins 301 .

[0046] The working steps of the above embodiment are:

[0047] On the basis of the first embodiment, a plurality of fins 301 are arranged outside the valve body 3, and the fins 301 arranged in an array outside the valve body 3 transfer heat between the medium in the temporary storage chamber 3001 and the outside. When the outside air flows along the direction in which the fins 301 extend, the air and the fins 301 are fully exchanged with each other, and the fins 301 are arranged along the curved surface at the bottom of the valve body 3, so that when the outside air flows along the direction of the fin 301 array, the fins 301 are in more complete contact with the air, thereby effectively improving the heat exchange efficiency of the fins 301. , wherein a transverse heat dissipation channel is also opened on the fin 301. When the air flows in the direction of the fin array 301, the air can also be guided to both sides when passing through the transverse heat dissipation channel, thereby achieving sufficient heat exchange for the valve body 3. When the ball valve is used on a high-temperature or low-temperature medium delivery pipeline, the medium remains in the temporary storage chamber 3001, which may easily cause the valve body 3 to explode under overheating or overcooling conditions, or the valve stem 5 to be frozen, and the hand wheel 6 cannot be rotated, resulting in the inability to open and close the ball valve in time.

[0048] Although the present invention is described in detail with reference to the above embodiments, it is obvious to those skilled in the art through this disclosure that various changes or modifications may be made to the present invention without departing from the principle and spirit of the present invention defined by the claims. Therefore, the detailed description of the embodiments of the present disclosure is only used to explain, not to limit the present invention, but the scope of protection is limited by the content of the claims.

Claims

1. A top-entry ball valve, comprising a valve seat 1 (1), a valve seat 2 (2) and a valve body (3); the valve seat 1 (1) and the valve seat 2 (2) are connected to the ... It also comprises a valve cover (4), a valve stem (5), a hand wheel (6), a valve core (7), a positioning rod (8), a limit plate (9) and a sealing ring (10); the valve body (3) is detachably connected with the valve cover (4); the valve cover (4) is rotatably connected with the valve stem (5); the valve stem (5) is fixedly connected with the hand wheel (6); the valve core (7) is plugged into the valve stem (5); a packing sealing layer is detachably connected between the valve cover (4) and the valve core (7); the lower part of the valve core (7) is rotatably connected to the valve body (3); two positioning rods (8) are fixedly connected to the left and right parts of the valve body (3); a limit plate (9) is detachably connected between the two positioning rods (8) on the left; another limit plate (9) is detachably connected between the two positioning rods (8) on the right; all the limit plates (9) are in contact with the packing sealing layer; each limit plate (9) is fixedly connected with a sealing ring (10); the valve core (7) is in contact with the corresponding sealing ring (10); It also includes a return pipe (101); a temporary storage chamber (3001) is left between the valve core (7) and the valve body (3); the temporary storage chamber (3001) is connected to the return pipe (101); and the return pipe (101) is connected to the second valve seat (2).

2. A top entry ball valve according to claim 1, characterized in that: A circular clamping ring is provided at the lower part of the valve stem (5). The circular clamping ring is located between the packing sealing layer and the valve cover (4) and is used to press the valve stem (5) onto the valve core (7).

3. A top entry ball valve according to claim 1, characterized in that: The return pipe (101) is connected to the valve seat 2 (2) at an angle.

4. A top entry ball valve according to claim 1, characterized in that: It also includes a breathing valve (102) and a liquid discharge valve (103); the temporary storage chamber (3001) is connected to the breathing valve (102); and the temporary storage chamber (3001) is connected to the liquid discharge valve (103).

5. A top entry ball valve according to claim 4, characterized in that: It also comprises a mounting plate (201), a support rod (202) and a sealing sheet (203); the mounting plate (201) is fixedly connected inside the return pipe (101); the mounting plate (201) is detachably connected to the support rod (202); the sealing sheet (203) is fixedly connected to the support rod (202); and the sealing sheet (203) is in contact with the inner wall of the return pipe (101).

6. A top entry ball valve according to claim 5, characterized in that: It also includes a limiting ring (204); the limiting ring (204) is fixedly connected inside the return pipe (101); and the limiting ring (204) is in contact with the sealing sheet (203).

7. A top entry ball valve according to claim 6, characterized in that: A through groove is formed on the sealing sheet (203), and the through groove is perpendicular to the axial direction of the sealing sheet (203).

8. A top entry ball valve according to any one of claims 1 to 7, characterized in that: It also includes fins (301); a plurality of fins (301) are fixedly connected to the outer wall of the valve body (3).

9. A top entry ball valve according to claim 8, characterized in that: The fins (301) are distributed in an array along the outer wall of the valve body (3), the fins (301) are in a concentric circle state, and a plurality of transverse heat dissipation channels are provided on the fins (301).

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