Novel high-frequency ball valve

Abstract

The utility model discloses a novel high-frequency ball valve which comprises a shell, a connecting rod ball installed in an inner cavity of the shell and a valve seat arranged between the shell and the connecting rod ball to achieve clearance sealing. The connecting rod ball comprises a valve rod at the upper end, a ball body in the middle and a bottom shaft at the lower end, and the diameter of the valve rod is larger than that of the bottom shaft; an annular limiting groove for limiting the connecting rod ball to move upwards is formed in the inner wall of the upper portion of the shell, and a gas storage groove is formed in the inner wall of the bottom of the shell. According to the ball valve, the ball body can be always kept in the center of the inner cavity of the shell, even if pressure is accumulated in the inner cavity of the ball valve, the ball body and the valve seat can be always in contact to keep a good sealing effect, the inner leakage phenomenon of the ball valve can be avoided, and the problem that the connecting rod ball moves upwards due to residual gas can be solved.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and in particular relates to a novel high-frequency ball valve. Background Technology

[0002] High-frequency ball valves are generally used in metering. In some special positions in devices such as polyolefin catalysts, the ball valve is required to be accurate in metering, quick in opening and closing, and have an annual operating frequency of more than one million times. Therefore, in order to ensure the sealing performance of the ball valve, an integrated connecting rod ball structure is used, which has better stability and makes the opening angle of the ball and the drive device completely consistent, making the opening and closing more accurate, while also ensuring the sealing performance of the ball valve.

[0003] The connecting rod ball valve includes an upper valve stem, a middle ball, and a bottom shaft. For example, in a novel high-frequency metering ball valve disclosed in Chinese Patent Publication No. CN221221502U, the valve stem diameter of the connecting rod ball in earlier designs was smaller than the bottom shaft diameter. Therefore, when pressure accumulates in the middle cavity, such as... Figure 1 As shown, the arrow indicates the position where the medium contacts the surface of the ball. When the diameter of the bottom shaft is larger than the diameter of the valve stem, the medium contact area on the lower side of the ball will be smaller than the medium contact area on the upper side of the ball. Since the pressure within the medium channel remains constant, according to the formula pressure = medium contact area pressure, the pressure on the lower side of the ball is less than the pressure on the upper side. Due to this uneven force, the ball will move downwards, leading to a poorer seal between the ball and the valve seat and causing internal leakage. Furthermore, in this design, when the connecting rod ball is assembled into the housing, residual gas will remain at the bottom of the bottom shaft. However, in this design… The bottom shaft is directly mounted on the valve body via a wave spring. The space for gas storage between the bottom shaft and the valve body is very small, which leads to a relatively high pressure of residual gas. This high pressure of residual gas poses a risk of the ball moving axially upwards, resulting in poor sealing between the ball and the valve seat and causing internal leakage. In the ball valve of the above solution, when the middle cavity of the ball valve is filled with gas, the ball will move downwards, causing internal leakage. The residual gas in the connecting rod ball will cause the ball to move upwards, causing internal leakage. Therefore, in the above solution, the ball will move up and down, resulting in poor sealing between the ball and the valve seat and causing internal leakage.

[0004] Therefore, it is necessary to provide a new type of high-frequency ball valve to solve the above-mentioned technical problems. Utility Model Content

[0005] The main purpose of this utility model is to provide a new type of high-frequency ball valve that can keep the ball in the center of the inner cavity of the shell at all times. Even when there is pressure accumulation in the inner cavity of the ball valve, the ball and the valve seat can always be in contact to maintain a good sealing effect, which can avoid the internal leakage of the ball valve and solve the problem of residual gas causing the ball to move upward.

[0006] The utility model discloses a novel high frequency ball valve, it includes the casing, the connecting rod ball of installation in the inner chamber of casing and the valve seat of setting between the casing and the connecting rod ball realizes the clearance seal,

[0007] The connecting rod ball includes the valve stem of upper end, the ball of middle part and the bottom axle of lower end, the diameter of valve stem is greater than the diameter of bottom axle,

[0008] The annular limiting groove of the restriction connecting rod ball upward movement is set up on the upper inner wall of casing, and the gas storage groove is set up in the bottom inner wall.

[0009] Further, the mounting groove of installing bottom axle is set up in the bottom of casing, the gas storage groove is communicated with mounting groove and is located below mounting groove, the diameter of mounting groove is greater than the diameter of gas storage groove, and the junction of mounting groove and gas storage groove is horizontal first step surface.

[0010] Further, the elastic pad is set up on the first step surface, and the vent hole is set up in the middle of the elastic pad.

[0011] Further, the valve stem includes the valve stem main body of upper end and the first connecting section of lower end and ball connection, the diameter of first connecting section is greater than the diameter of valve stem main body, and the junction of valve stem main body and first connecting section is horizontal second step surface.

[0012] Further, the bearing of the sleeve set in the outer periphery of valve stem main body is set up on the second step surface, the guide bushing of the sleeve set in the outer periphery of valve stem main body and being in contact with valve stem main body is set up above bearing, and the upper end surface of bearing is abutted on the groove wall of annular limiting groove.

[0013] Further, the bottom axle includes the bottom axle main body of lower end and the second connecting section of upper end and ball connection, the diameter of second connecting section is greater than the diameter of bottom axle main body, and the junction of bottom axle main body and second connecting section is horizontal third step surface.

[0014] Further, the limiting sleeve and bushing of the sleeve set in the outer periphery of bottom axle main body are set up in mounting groove, the limiting sleeve is located in the inner side and realizes sealing by the first sealing element and bottom axle main body contact, and the lower end of limiting sleeve and bushing is pressed on the elastic pad, and the upper end is abutbed on the third step surface.

[0015] Further, the valve seat comprises a sealing surface achieving gap sealing with the ball, a first matching surface and a second matching surface matched with the inner wall of the shell, and the inner wall of the shell is provided with an elastic member abutting on the first matching surface.

[0016] Further, the second matching surface is provided with a second accommodating groove, and the second accommodating groove is provided with a second sealing member achieving sealing between the valve seat and the inner wall of the shell.

[0017] Further, the shell comprises a valve body and valve covers arranged on both sides of the valve body, the connecting rod ball is installed inside the valve body, the upper end of the valve body is provided with a stuffing box, the stuffing box is provided with stuffing achieving gap sealing between the valve body and the valve rod, and the installation groove and the gas storage groove are arranged on the inner wall below the valve body.

[0018] Compared with the prior art, the novel high-frequency ball valve has the beneficial effects that: when the medium in the middle cavity of the ball valve accumulates, the medium contact area on the lower side of the ball is greater than that on the upper side of the ball because the diameter of the valve rod main body is greater than that of the bottom shaft main body, the pressure in the medium channel is consistent, according to the formula pressure = medium contact area pressure, the pressure on the lower side of the ball is greater than that on the upper side of the ball, the ball has a tendency to move upward, but the annular limiting groove arranged on the shell can limit the upward movement of the connecting rod ball, the upward movement of the ball can be avoided, the ball and the valve seat are still in a sealing state at this time, and the internal leakage problem caused by the downward movement of the ball in the prior art can be solved; the elastic pad is arranged on the first step surface, the elastic pad has great elasticity, the elastic pad generates upward elastic pre-tightening force after the connecting rod ball compresses the elastic pad, the downward movement of the connecting rod ball can be avoided, and the sealing effect between the ball and the valve seat can be ensured, therefore, the annular limiting groove arranged can limit the upward movement of the connecting rod ball, the elastic pad arranged can prevent the downward movement of the ball, the scheme can keep the ball at the center position of the inner cavity of the shell at all times, even when the middle cavity of the ball valve accumulates, the ball and the valve seat can always contact and keep good sealing effect, and the internal leakage of the ball valve can be avoided; moreover, after the connecting rod ball is assembled into the limiting sleeve, the gas at the bottom of the bottom shaft enters the gas storage groove through the air hole, the gas storage groove arranged can store the residual gas during the installation of the connecting rod ball, the gas storage groove arranged can greatly reduce the pressure of the residual gas, the pressure of the residual gas is basically consistent with the atmospheric pressure, the upward movement of the ball can be avoided, and the problem that the residual gas causes the upward movement of the connecting rod ball can be solved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The force structure of the ball surface when the medium contacts the ball surface when the middle cavity accumulates is shown in the force structure of the ball surface when the medium contacts the ball surface when the middle cavity accumulates.

[0020] Figure 2 It is novel high frequency ball valve section structure schematic view of the embodiment of the utility model;

[0021] Figure 3 It is novel high frequency ball valve section structure schematic view of the embodiment of the utility model; Figure 2 It is novel high frequency ball valve section structure schematic view of the embodiment of the utility model;

[0022] The figure indicates:

[0023] 100-novel high frequency ball valve;

[0024] 1-housing, 11-annular limit groove, 12-gas storage groove, 13-mounting groove, 14-first step surface, 15-valve body, 16-valve cover, 17-stuffing box, 18-stuffing;

[0025] 2-connecting rod ball, 21-valve rod, 211-valve rod main body, 212-first connecting section, 213-second step surface, 214-bearing, 215-guide shaft sleeve, 22-ball, 23-bottom shaft, 231-bottom shaft main body, 232-second connecting section, 233-third step surface, 234-limit sleeve, 235-bushing, 236-first sealing element;

[0026] 3-valve seat, 31-sealing surface, 32-first matching surface, 33-second matching surface, 34-second sealing element;

[0027] 4-elastic pad, 41-vent hole;5-elastic element. DETAILED DESCRIPTION

[0028] Please refer to Figures 2-3 The embodiment is a kind of novel high frequency ball valve 100, and a kind of novel high frequency ball valve 100 includes housing 1, connecting rod ball 2 and valve seat 3 for realizing gap sealing between housing 1 and connecting rod ball 2 are installed in the cavity of housing 1;Connecting rod ball 2 includes the valve rod 21 of upper end, the ball 22 of middle part and the bottom shaft 23 of lower end, the diameter of valve rod 21 is greater than the diameter of bottom shaft 23;The upper inner wall of housing 1 is provided with annular limit groove 11 for limiting the upward movement of connecting rod ball 2, and the bottom inner wall is provided with gas storage groove 12.

[0029] The bottom of housing 1 is provided with mounting groove 13 for mounting bottom shaft 23, gas storage groove 12 is communicated with mounting groove 13 and located below mounting groove 13, the diameter of mounting groove 13 is greater than the diameter of gas storage groove 12, and the connection between mounting groove 13 and gas storage groove 12 is horizontal first step surface 14.

[0030] The valve rod 21 comprises a valve rod body 211 at the upper end and a first connecting section 212 at the lower end connected with the ball 22, the diameter of the first connecting section 212 is larger than that of the valve rod body 211, and the connection between the valve rod body 211 and the first connecting section 212 is a horizontal second step surface 213, the second step surface 213 is provided with a bearing 214 sleeved on the outer periphery of the valve rod body 211, and an upper end surface of the bearing 214 abuts against the groove wall of the annular limiting groove 11, and the step surface is matched with the annular limiting groove 11, so that the valve rod 21 is limited upwardly, and the connecting rod ball 2 is prevented from moving upwardly.

[0031] The bottom shaft 23 comprises a bottom shaft body 231 at the lower end and a second connecting section 232 at the upper end connected with the ball 22, the diameter of the second connecting section 232 is larger than that of the bottom shaft body 231, and the connection between the bottom shaft body 231 and the second connecting section 232 is a horizontal third step surface 233. A limiting sleeve 234 sleeved on the outer periphery of the bottom shaft body 231 and a bushing 235 are arranged in the mounting groove 13, the limiting sleeve 234 is located at the inner side and is in sealing contact with the bottom shaft body 231, and the outer wall of the bushing 235 is in sealing contact with the inner wall of the mounting groove 13, in order to ensure the sealing effect between the limiting sleeve 234 and the bottom shaft body 231, a first sealing element 236 is arranged between the limiting sleeve 234 and the bottom shaft body 231, and the first sealing element 236 can be an O-shaped sealing ring or a coated spring.

[0032] When the medium is accumulated in the middle cavity of the ball valve, the diameter of the valve rod body 211 is larger than that of the bottom shaft body 231, the medium contact area on the lower side of the ball is larger than that on the upper side of the ball, and the pressure in the medium channel is consistent. According to the formula of pressure = medium contact area pressure, it can be known that the pressure on the lower side of the ball is greater than that on the upper side of the ball, and the ball has a tendency to move upwardly, but the shell 1 is provided with the annular limiting groove 11, which can limit the upward movement of the connecting rod ball 2, and can avoid the upward movement of the ball 22, so that the ball 22 and the valve seat 3 are still in a sealing state, and the internal leakage problem caused by the downward movement of the ball 22 in the prior art can be solved. In order to ensure the stability of the connecting rod ball 2, preferably, the difference between the cross-sectional area of the valve rod body 211 and the cross-sectional area of the bottom shaft body 231 is less than 10%.

[0033] The elastic pad 4 is arranged on the first step surface 14, and a vent hole 41 is arranged in the middle of the elastic pad 4. After the connecting rod ball 2 is assembled into the limiting sleeve 234, the gas at the bottom of the bottom shaft 23 enters the gas storage groove 11 through the vent hole 41. The lower ends of the limiting sleeve 234 and the bushing 235 are pressed on the elastic pad 4, and the upper ends are pressed on the third step surface 233. The elastic pad 4 has great elasticity. After the connecting rod ball 2 compresses the elastic pad 4, the elastic pad 4 generates an upward elastic pre-tightening force, which can prevent the connecting rod ball 2 from moving downward, thereby ensuring the sealing effect between the ball body 22 and the valve seat 3. Preferably, the ratio of the size of the high elastic pre-tightening force to the size of the weight of the ball body 22 is 60%, which can prevent the ball body 22 from moving downward.

[0034] Therefore, the annular limiting groove 11 can limit the upward movement of the connecting rod ball 2, and the elastic pad 4 can prevent the downward movement of the ball body 22. The scheme can keep the ball body 22 always at the center position of the inner cavity of the shell 1. Even if there is a pressure accumulation in the inner cavity of the ball valve, the ball body 22 and the valve seat 3 can always be in contact and have good sealing effect, which can avoid the internal leakage of the ball valve.

[0035] After the connecting rod ball 2 is assembled into the limiting sleeve 234, the gas at the bottom of the bottom shaft 23 enters the gas storage groove 11 through the vent hole 41. The gas storage groove 11 can store the residual gas when the connecting rod ball 2 is installed. The gas storage groove 11 can greatly reduce the pressure of the residual gas, so that the pressure of the residual gas is basically consistent with the atmospheric pressure, which can prevent the upward movement of the ball body 22 and solve the problem of upward movement of the connecting rod ball 2 caused by the residual gas.

[0036] The valve seat 3 includes a sealing surface 31 for realizing gap sealing with the ball body 22, a first matching surface 32 and a second matching surface 33 matched with the inner wall of the shell 1. The first matching surface 32 is arranged vertically, and the second matching surface is arranged horizontally. An elastic member 5 is arranged on the inner wall of the shell 1 and abuts against the first matching surface 32. A first accommodating groove is arranged on the inner wall of the shell 1 and accommodates the elastic member 5. The elastic member 5 provides a pre-tightening force for the valve seat 3. When the ball body 22 presses the sealing surface 31, the valve seat 3 will press the elastic member 5, so that the elastic member 5 is compressed. The stretched elastic member 5 moves the valve seat 3 to one side of the ball body 22, and the elastic deformation of the valve seat 3 realizes the gap sealing between the valve seat 3 and the ball body 22. A second accommodating groove is arranged on the second matching surface 33, and a second sealing member 34 for realizing the sealing between the valve seat 3 and the inner wall of the shell 1 is arranged in the second accommodating groove. The second sealing member 34 can be an O-shaped sealing ring or a coated spring, which is used to realize the sealing between the valve seat 3 and the inner wall of the shell 1.

[0037] The shell 1 comprises a valve body 15 and valve covers 16 arranged on both sides of the valve body 15, the connecting rod ball 2 is installed in the interior of the valve body 15, the upper end of the valve body 15 is provided with a stuffing box 17, the stuffing box 17 is provided with a packing 18 for realizing gap sealing between the valve body 15 and a valve rod 21, and the installation groove 13 and the gas storage groove 12 are all arranged on the inner wall below the valve body 15.

[0038] The above only describes some embodiments of the present application. For those skilled in the art, without departing from the inventive concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. A new high frequency ball valve characterized by: It includes a shell, a connecting rod ball installed in the inner cavity of the shell, and a valve seat arranged between the shell and the connecting rod ball to achieve gap sealing; The connecting rod ball includes a valve stem at the upper end, a ball body at the middle, and a bottom shaft at the lower end, the diameter of the valve stem is larger than that of the bottom shaft; An annular limiting groove limiting the upward movement of the connecting rod ball is arranged on the upper inner wall of the shell, and a gas storage groove is arranged on the bottom inner wall.

2. A new high frequency ball valve as claimed in claim 1, characterized in that: An installation groove for installing the bottom shaft is arranged on the bottom of the shell, the gas storage groove is in communication with the installation groove and located below the installation groove, the diameter of the installation groove is larger than that of the gas storage groove, and the connection between the installation groove and the gas storage groove is a horizontal first step surface.

3. A new high frequency ball valve as claimed in claim 2, characterized in that: An elastic pad is arranged on the first step surface, and a ventilation hole is arranged in the middle of the elastic pad.

4. A new high frequency ball valve as claimed in claim 1, characterized in that: The valve stem includes a valve stem body at the upper end and a first connecting section connected with the ball body at the lower end, the diameter of the first connecting section is larger than that of the valve stem body, and the connection between the valve stem body and the first connecting section is a horizontal second step surface.

5. A new high frequency ball valve as claimed in claim 4, characterized in that: A bearing is arranged on the second step surface and sleeved on the outer periphery of the valve stem body, a guide sleeve is arranged above the bearing and sleeved on the outer periphery of the valve stem body and in contact with the valve stem body, and the upper end surface of the bearing abuts against the groove wall of the annular limiting groove.

6. A new high frequency ball valve as claimed in claim 3, characterized in that: The bottom shaft includes a bottom shaft body at the lower end and a second connecting section connected with the ball body at the upper end, the diameter of the second connecting section is larger than that of the bottom shaft body, and the connection between the bottom shaft body and the second connecting section is a horizontal third step surface.

7. A new high frequency ball valve as claimed in claim 6, characterized in that: A limiting sleeve and a bushing are arranged in the installation groove and sleeved on the outer periphery of the bottom shaft body, the limiting sleeve is located on the inner side and sealed by the first sealing element in contact with the bottom shaft body, and the lower end of the limiting sleeve and the bushing is pressed on the elastic pad, and the upper end abuts against the third step surface.

8. A new high frequency ball valve as claimed in claim 1, characterized in that: The valve seat includes a sealing surface achieving gap sealing with the ball body, a first matching surface and a second matching surface matched with the inner wall of the shell, and an elastic element abutting against the first matching surface is arranged on the inner wall of the shell.

9. A new high frequency ball valve as claimed in claim 8, characterized in that: A second accommodating groove is arranged on the second matching surface, and a second sealing element achieving sealing between the valve seat and the inner wall of the shell is arranged in the second accommodating groove.

10. A new high frequency ball valve as claimed in claim 2, characterized in that: The shell includes a valve body and valve covers arranged on both sides of the valve body, the connecting rod ball is installed in the interior of the valve body, a stuffing box is arranged at the upper end of the valve body, a stuffing is arranged in the stuffing box to achieve gap sealing between the valve body and the valve stem, and the installation groove and the gas storage groove are arranged on the inner wall below the valve body.

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