Low-torque driving device for ultrahigh-pressure valve

Abstract

The invention provides a low-torque driving device for an ultrahigh-pressure valve, and belongs to the technical field of valve driving devices.The low-torque driving device comprises an opening and closing control assembly directly connected with a valve rod, the opening and closing control assembly comprises a lead screw nut, a first step limiting part is arranged outside the lead screw nut, and a threaded shaft and a plurality of threaded rollers are arranged in the lead screw nut; the threaded pin rollers are distributed in the circumferential direction of the threaded shaft and meshed between the threaded shaft and the lead screw nut, and the installation assembly is installed on the valve body. The mounting assembly comprises a bearing seat, a locking piece, a bearing gland and a plurality of bearing pieces, and the bearing pieces are distributed in the axial direction of the lead screw nut and arranged on the lead screw nut in a sleeving mode to form a columnar supporting unit. According to the low-torque driving device for the ultrahigh-pressure valve, the friction loss in the opening and closing process of the valve is fully reduced, the bearing capacity in the opening and closing process is improved, the labor-saving effect of driving large axial force through small torque is achieved, the opening and closing portability of the valve is effectively improved, and the low-torque driving device is simple in overall structure and convenient to assemble.

Description

Technical Field

[0001] The present invention relates to the technical field of ultra-high pressure valve driving devices, and particularly to a low-torque driving device for ultra-high pressure valves. Background Art

[0002] Ultra-high pressure valves are mainly used in fluid control equipment under extremely high pressure conditions, and are commonly used in fields such as oil and gas extraction, chemical industry, electric power, and aerospace. Their opening and closing driving devices need to achieve reliable sealing and precise control under extreme pressures.

[0003] Most traditional driving devices use transmission mechanisms such as worm gears and worm shafts or threaded screw rods, and transmit the driving force to the valve stem through mechanical transmission to control the opening and closing of the valve. However, the frictional losses generated during their operation are relatively high, the input torque is large, the opening and closing process is laborious, the convenience of use is low, and the stability during long-term operation is also relatively low. Summary of the Invention

[0004] The present invention provides a low-torque driving device for ultra-high pressure valves to solve the problems of high wear, low convenience, and low stability during long-term operation in the opening and closing process of valves in related technologies.

[0005] The present invention provides a low-torque driving device for ultra-high pressure valves, which is installed on the valve body and used to control the movement of the valve stem to achieve the opening and closing of the valve. It includes an opening and closing control component directly connected to the valve stem. The opening and closing control component includes a lead screw nut externally provided with a step limit part I. A threaded shaft and a number of threaded rollers are arranged in the lead screw nut. A cage is installed on the threaded shaft. The number of threaded rollers is circumferentially distributed along the threaded shaft and meshes between the threaded shaft and the lead screw nut. The spiral groove directions of the threaded shaft and the lead screw nut are opposite, and the threaded rollers are all installed on the cage; the valve stem is fixedly connected to the threaded shaft, and a control member for controlling the rotation of the lead screw nut is connected to the lead screw nut; an installation component installed on the valve body; the installation component includes a bearing seat, a locking member, a bearing gland, and a number of bearing members. The number of bearing members is axially distributed along the lead screw nut and sleeved on the lead screw nut to form a columnar support unit, and the bearing members are fixed on the bearing seat through the bearing gland. The locking member is connected to the lead screw nut and cooperates with the step limit part I to make the number of bearing members closely abut together. A step limit part II is arranged in the bearing seat, and the step limit part II limits the bearing members from the side far away from the bearing gland. Among them, the bearing gland is threadedly connected to the bearing seat.

[0006] In a possible implementation manner, the threaded shaft includes a shaft body and a sleeve body for connecting with the valve stem. The sleeve body is sleeved on the end of the valve stem, and both the sleeve body and the valve stem, and the control member and the lead screw nut are fixedly connected through pins.

[0007] In a possible implementation manner, clamping grooves are symmetrically formed on the threaded shaft, snap rings are installed in the clamping grooves, the cage is of an annular structure and is symmetrically distributed, the symmetrically distributed cages are respectively located at both ends of the threaded roller, and the symmetrically distributed snap rings correspond to the cages one by one and limit the corresponding cages from both ends of the threaded roller.

[0008] In a possible implementation manner, an annular groove is formed on the outer peripheral surface of the sleeve, a retaining ring is installed in the annular groove, and the retaining ring limits the plug from the end of the plug.

[0009] In a possible implementation manner, seals are provided between the lead screw nut and the bearing gland, and between the bearing gland and the bearing housing.

[0010] One or more of the above technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0011] 1. According to a low-torque driving device for an ultra-high pressure valve provided by an embodiment of the present invention, the lead screw nut, the threaded roller and the threaded shaft drive each other, and the rolling friction of point contact is adopted between them to convert the rotational motion of the lead screw nut into the up-and-down motion of the threaded shaft and control the opening and closing of the valve. And a stable installation environment with low friction during the working process is provided for the lead screw nut by the columnar support unit, which fully reduces the friction loss during the opening and closing of the valve and improves the load-bearing capacity during the opening and closing process, realizes the labor-saving effect of driving a large axial force with a small torque, and effectively improves the convenience of opening and closing the valve.

[0012] 2. During the installation process, after the bearing sleeve is sleeved on the lead screw nut, a plurality of bearing parts can be quickly abutted against each other to form a columnar support unit by the cooperation of the first step limit part and the locking part. Then, it is installed in the bearing housing and the bearing parts are limited by the first step limit part, avoiding the contact between the locking part and the non-rotating part during the rotation of the lead screw nut to generate friction force, which affects the opening and closing of the valve or the stability of the installation of the bearing parts, further improving the convenience during the opening and closing process of the valve, and the overall structure is simple and the assembly convenience is high. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of an assembly state of a low-torque driving device for an ultra-high pressure valve provided by an embodiment of the present invention and a partial structure of the valve.

[0014] Figure 2 is a schematic structural diagram of an installation component of a low-torque driving device for an ultra-high pressure valve provided by an embodiment of the present invention.

[0015] Figure 3 is a schematic cross-sectional structural diagram of a low-torque driving device for an ultra-high pressure valve provided by an embodiment of the present invention.

[0016] Figure 4 This is a schematic diagram showing the change in the working state of the opening and closing control component of a low-torque driving device for an ultra-high pressure valve provided by an embodiment of the present invention, controlling the valve to change from the closed state to the open state.

[0017] Figure 5 This is an exploded view of the opening and closing control component of a low-torque driving device for an ultra-high pressure valve provided by an embodiment of the present invention.

[0018] Figure 6 This is a schematic structural diagram of a seal between a bearing gland and a lead screw nut of a low-torque driving device for an ultra-high pressure valve provided by an embodiment of the present invention.

[0019] In the figure: 1, valve body; 101, valve seat; 102, valve cover; 103, valve plate; 2, valve stem; 3, opening and closing control component; 31, first step limit part; 32, lead screw nut; 33, threaded shaft; 331, shaft body; 332, sleeve body; 333, annular groove; 334, retaining ring; 34, threaded roller; 35, cage; 36, control part; 37, card slot; 38, snap ring; 4, mounting component; 41, bearing seat; 42, locking part; 43, bearing gland; 44, bearing component; 45, second step limit part; 46, seal; 5, pin; 6, jack. Detailed implementation manners

[0020] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementation manners disclosed below.

[0021] Please refer to Figure 1 and Figure 3 , a low-torque driving device for an ultra-high pressure valve, which is installed on the valve body 1 and used to control the movement of the valve stem 2 to realize the opening and closing of the valve. As Figure 1 shown, the valve body 1 includes a valve seat 101, a valve cover 102 and a valve plate 103 installed in the valve seat 101. The valve cover 102 is fixedly installed on the valve seat 101, the valve plate 103 is fixedly connected to the lower end of the valve stem 2, the upper end of the valve stem 2 passes upward through the valve cover 102, and the valve stem 2 drives the valve plate 103 to move up and down synchronously to realize the opening and closing of the valve.

[0022] Refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5, An opening and closing control component 3 is connected to the valve stem 2. The opening and closing control component 3 includes a lead screw nut 32 with a step limit part 31 arranged on the outside. A lead screw 33 and a number of thread rollers 34 are arranged in the lead screw nut 32. A cage 35 is installed on the lead screw 33. The number of thread rollers 34 are circumferentially distributed along the lead screw 33 and are screwed between the lead screw 33 and the lead screw nut 32. The spiral groove directions of the lead screw 33 and the lead screw nut 32 are opposite, and the thread rollers 34 are all installed on the cage 35. The valve stem 2 is fixedly connected to the lead screw 33. A control member 36 for controlling the rotation of the lead screw nut 32 is connected to the lead screw nut 32. The control member 36 is a handwheel. Rotating the handwheel drives the lead screw nut 32 to rotate. The thread rollers 34 are simultaneously meshed with the lead screw nut 32 and the lead screw 33 to form a conjugate meshing. The thread rollers 34 revolve around the lead screw 33 in a planetary manner under the forcing of the cage 35. Since the lead screw 33 does not rotate, it forces the thread rollers 34 to rotate in the opposite direction of the revolution while revolving. At the same time, the axial degree of freedom of the lead screw nut 32 is restricted and it cannot move, so that the combined movement of the rotation and revolution of the thread rollers 34 is converted into the linear displacement movement of the lead screw 33. The lead screw 33 drives the valve stem 2 and the valve plate 103 to move linearly to complete the opening and closing of the valve. Among them, the rotation and revolution of the thread rollers 34 are in point contact rolling friction with the lead screw nut 32 and the lead screw 33, which fully reduces the friction loss and improves the bearing capacity, realizes the labor-saving effect of driving a large axial force with a small torque, and effectively improves the lightness of the valve opening and closing.

[0023] Refer to Figure 1 , Figure 2 , Figure 3 and Figure 4, an installation component 4 is installed on the valve body 1. The installation component 4 includes a bearing seat 41, a locking member 42, a bearing gland 43, and a number of bearing members 44. The bearing seat 41 is fixedly installed above the valve cover 102. A number of bearing members 44 are distributed along the axial direction of the lead screw nut 32 and sleeved on the lead screw nut 32. The bearing members 44 are fixed on the bearing seat 41 through the bearing gland 43. The locking member 42 is threadedly connected to the lead screw nut 32 and cooperates with the first step limiting portion 31 to make a number of bearing members 44 closely abut against each other. A number of bearing members 44 form a columnar support unit along the axial direction to provide stable support for the lead screw nut 32. During the assembly process, a number of bearing members 44 are first sleeved on the lead screw nut 32, and then the locking member 42 is installed, so that the locking member 42 is connected to the lead screw nut 32 by thread and limits the bearing members 44 from below. The first step limiting portion 31 limits the bearing members 44 from above, so that a number of bearing members 44 are closely connected together and installed on the lead screw nut 32. Then, the bearing members 44 are installed in the bearing seat 41 and the bearing gland 43 is installed. The bearing gland 43 fixes a number of bearing members 44 on the bearing seat 41. A number of bearing members 44 closely abut against each other and are connected between the bearing seat 41 and the lead screw nut 32. On the one hand, it provides stable support and working environment for the lead screw nut 32, and on the other hand, it further reduces the friction generated during the rotation of the lead screw nut 32, improves the lightness and stability of valve opening and closing, and the overall structure is convenient for assembly. Among them, the bearing gland 43 is threadedly connected to the bearing seat 41, and the bearing member 44 is an angular contact ball bearing.

[0024] Refer to Figure 2 , a second step limiting portion 45 is arranged in the bearing seat 41. The second step limiting portion 45 limits the outer ring of the bearing member 44 from the bottom side, so that the locking member 42 only contacts the inner ring of the lead screw nut 32 and the bearing member 44. During the rotation of the lead screw nut 32, the locking member 42 rotates with the inner ring of the bearing member 44, avoiding the generation of friction between the locking member 42 and the bearing seat 41 during the rotation of the lead screw nut 32, which affects the stability of the installation of the bearing member 44 and the lightness of valve opening and closing.

[0025] Refer to Figure 2 , Figure 3 and Figure 5 , the threaded shaft 33 includes a shaft body 331 and a sleeve body 332 for connecting with the valve stem 2. The sleeve body 332 is sleeved on the end of the valve stem 2, and the sleeve body 332 is fixedly connected to the valve stem 2 and the control member 36 and the lead screw nut 32 through pins 5. Combining Figure 3 and Figure 5 shown, taking the sleeve body 332 and the valve stem 2 as an example, both the sleeve body 332 and the valve stem 2 are provided with slotted head jacks 6 through which. The pin 5 is inserted into the jack 6, which is convenient for the assembly and disassembly of the valve stem 2 and the sleeve body 332. And the sleeve body 332 is sleeved on the valve stem 2, which is beneficial to enhancing the connection stability between the two to a certain extent.

[0026] Refer to Figure 5 , an annular groove 333 is formed on the outer peripheral surface of the sleeve body 332, and a retaining ring 334 is installed in the annular groove 333. The retaining ring 334 limits the plug pin 5 from the end of the plug pin 5, so that the plug pin 5 is stably inserted into the jack 6, ensuring the stability of the connection between the sleeve body 332 and the valve stem 2.

[0027] Refer to Figure 4 and Figure 5 , clamping grooves 37 are symmetrically formed on the upper and lower sides of the threaded shaft 33, and snap rings 38 are installed in the clamping grooves 37. The cage 35 is of an annular structure. Referring to Figure 4 and Figure 5 as shown, a number of guiding holes are circumferentially arranged on the cage 35, and the cage 35 is symmetrically distributed up and down and is respectively located at both ends of the threaded roller 34. Both ends of the threaded roller 34 are respectively inserted into the corresponding guiding holes on the cage 35. The snap rings 38 correspond to the cages 35 one by one and respectively limit the corresponding cages 35 from above and below, so that the cage 35 restricts the relative position of the threaded roller 34 and the threaded shaft 33 in the radial direction and the freedom degree of the threaded roller 34 in the axial direction, improving the assembly convenience on the basis of ensuring the operation stability of the opening and closing control assembly 3.

[0028] Refer to Figure 2 and Figure 6 , seals 46 are provided between the lead screw nut 32 and the bearing gland 43 and between the bearing gland 43 and the bearing housing 41. The seal 46 between the lead screw nut 32 and the bearing gland 43 is a packing gland, and its sectional structure is as Figure 6 shown. O-ring seals 46 are provided between the bearing gland 43 and the bearing housing 41.

[0029] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0030] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "connected", "installed", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection, or a sliding connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0031] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A low-torque drive device for an ultra-high pressure valve, mounted on a valve body (1) and used to control the movement of a valve stem (2) to open and close the valve, characterized in that: include An opening and closing control assembly (3) directly connected to the valve stem (2), the opening and closing control assembly (3) comprising a screw nut (32) with a stepped stopper (31) provided on the outside, a threaded shaft (33) and a plurality of threaded rollers (34) provided in the screw nut (32), and a retainer (35) mounted on the threaded shaft (33); A plurality of threaded rollers (34) are distributed along the circumference of the threaded shaft (33) and meshed between the threaded shaft (33) and the lead screw nut (32), the spiral grooves of the threaded shaft (33) and the lead screw nut (32) are in opposite directions, and the threaded rollers (34) are all mounted on a retaining frame (35); The valve stem (2) is fixedly connected to the threaded shaft (33), and the lead screw nut (32) is connected to a control member (36) for controlling the rotation of the lead screw nut (32); A mounting assembly (4) mounted on the valve body (1); the mounting assembly (4) comprises a bearing seat (41), a locking member (42), a bearing cover (43) and a plurality of bearing members (44); the plurality of bearing members (44) are distributed along the axial direction of the lead screw nut (32) and are sleeved on the lead screw nut (32) to form a columnar support unit, and the bearing member (44) is fixed to the bearing seat (41) via the bearing cover (43); The locking member (42) is connected to the lead screw nut (32) and cooperates with the step limiting portion 1 (31) to make the plurality of bearing members (44) closely abut against each other. The bearing seat (41) is provided with a step limiting portion 2 (45), and the step limiting portion 2 (45) limits the bearing member (44) from a side away from the bearing cover (43).

2. A low-torque driving device for an ultra-high pressure valve according to claim 1, characterized in that: The threaded shaft (33) comprises a shaft body (331) and a sleeve body (332) for connecting to the valve stem (2); the sleeve body (332) is sleeved on the end of the valve stem (2); and the sleeve body (332) and the valve stem (2) as well as the control member (36) and the lead screw nut (32) are fixedly connected via a latch (5).

3. A low-torque driving device for an ultra-high pressure valve according to claim 1 or 2, characterized in that: The threaded shaft (33) is symmetrically provided with a clamping groove (37), a clamping ring (38) is installed in the clamping groove (37), the retaining frame (35) is annular in structure and symmetrically distributed, the symmetrically distributed retaining frames (35) are respectively located at two ends of the threaded roller (34), the symmetrically distributed clamping rings (38) correspond to the retaining frames (35) one by one and limit the corresponding retaining frames (35) from the two ends of the threaded roller (34).

4. A low-torque driving device for an ultra-high pressure valve according to claim 2, characterized in that: An annular groove (333) is provided on the outer peripheral surface of the sleeve body (332), a retaining ring (334) is installed in the annular groove (333), and the retaining ring (334) limits the position of the latch pin (5) from the end of the latch pin (5).

5. A low-torque driving device for an ultra-high pressure valve according to claim 1, characterized in that: A sealing member (46) is provided between the lead screw nut (32) and the bearing cover (43), and between the bearing cover (43) and the bearing seat (41).

6. A low-torque driving device for an ultra-high pressure valve according to claim 1 or 5, characterized in that: The bearing gland (43) is threadedly connected to the bearing seat (41).

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