Lengthened transmission device of multi-rotation valve

Abstract

The utility model discloses a lengthened transmission device of a multi-rotation valve, which comprises a lengthened outer support, a valve rod nut and a transmission shaft, a mounting cavity of the lengthened outer support comprises a lengthened section and a nut mounting section, the transmission shaft and the valve rod nut are respectively arranged in the lengthened section and the nut mounting section, the transmission shaft is a hollow cylinder, and the transmission shaft is a hollow cylinder. Three-jaw connecting discs are fixed to the two ends of the transmission shaft, the lower end of the transmission shaft is clamped with a valve rod nut through the three-jaw connecting discs, a connecting disc valve rod passing opening is formed in the center of the three-jaw connecting disc at the bottom of the transmission shaft, and the valve rod nut is connected with a valve rod in a meshed mode. A table top sliding bearing and a table bottom sliding bearing are arranged on the top face and the bottom face of the bearing boss respectively, the bottom face of the table bottom sliding bearing is connected with a pressing plate at the bottom of the lengthened outer support, and a pressing plate valve rod passing opening is formed in the center of the pressing plate. The problems that an existing lengthened valve rod serves as an opening and closing transmission structure of an underground valve, the interference degree of the valve rod is too large, and deformation is prone to occurring are solved.

Description

Technical Field

[0001] The utility model relates to the field of valve structures, in particular to an extended transmission device for a multi-rotary valve. Background Art

[0002] Multi-turn valves refer to valves whose stems need multiple turns to open or close, such as gate valves, stop valves, throttle valves and diaphragm valves. Since the valves are often installed at the wellhead of gas pipelines or underground in long-distance pipelines, it is usually necessary to extend the valve stem to the ground to facilitate the operation of opening and closing the valve. However, directly extending the valve stem will cause some new problems, including the following:

[0003] ①. A valve stem that is too long will cause excessive valve stem disturbance.

[0004] ② The valve stem is prone to bending and deformation, causing the valve to get stuck and unable to open and close normally.

[0005] In order to solve the above problems, it is necessary to improve the existing valve lengthening and rotating opening and closing structure. Utility Model Content

[0006] The purpose of the utility model is to provide an extended transmission device for a multi-turn valve, so as to solve the problem that the existing multi-turn valves installed underground often directly extend the valve stem to serve as the transmission structure for opening and closing the valve, resulting in excessive interference and easy deformation of the valve stem.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A lengthened transmission device for a multi-turn valve comprises an lengthened outer bracket, a valve stem nut and a transmission shaft. The frame of the lengthened outer bracket is a mounting cavity, the horizontal cross-section of the mounting cavity is circular, the mounting cavity comprises an lengthened section and a nut mounting section sequentially arranged from top to bottom, the transmission shaft and the valve stem nut are rotatably arranged in the lengthened section and the nut mounting section of the mounting cavity respectively, the transmission shaft is a hollow cylinder, the outer wall of the transmission shaft is fitted with the inner wall of the mounting cavity, three-claw connecting discs are fixed at both ends of the transmission shaft, and the lower end of the transmission shaft is connected to the valve stem nut through the three-claw connecting disc. The valve stem nut is clamped, and a connecting plate valve stem passage opening is provided at the center position of the three-claw connecting plate that is clamped with the valve stem nut. The valve stem nut is meshed and connected with the valve stem through the nut hole. A bearing boss arranged around the outer wall of the valve stem nut is fixed in the middle part. The top and bottom surfaces of the bearing boss are respectively installed with a top sliding bearing and a bottom sliding bearing. The top surface of the top sliding bearing is connected to the limit platform on the inner surface of the nut mounting section, and the bottom surface of the bottom sliding bearing is connected to the pressure plate fixed at the bottom of the extended outer bracket. The center position of the pressure plate is provided with a pressure plate valve stem passage opening.

[0009] In this solution, the valve stem is not directly lengthened. Instead, the long-distance drive of the valve stem is completed by lengthening the outer bracket, the transmission shaft and the valve stem nut. When the device is used, the output end of the driver needs to be connected to the three-claw connecting disc at the top of the transmission shaft. The driver used here can be an ordinary handwheel drive mechanism or a conventional electric driver. After connecting the corresponding driver, the lifting and lowering of the valve stem can be controlled by the driver. When controlling the lifting and lowering of the valve stem, the driving force of the driver is input by the three-claw connecting disc at the top of the transmission shaft, which drives the transmission shaft to rotate. Since the bottom of the transmission shaft is connected to the valve stem nut through the three-claw connecting disc, When this drive shaft rotates, it can drive the valve stem nut to rotate, and the valve stem nut engages with the valve stem, so the valve stem can be raised and lowered under the action of the valve stem nut. According to the height at which the valve is installed at the wellhead or underground, the length of the outer bracket and the drive shaft can be adjusted in advance to achieve ground operation of the wellhead or underground valve. Through the solution in this application, the conventional problem of directly lengthening the valve stem, which causes excessive valve stem disturbance and valve stem bending and deformation causing valve jamming and inability to switch normally, is avoided. At the same time, because the valve stem is not lengthened, the wear of the valve stem during the transmission process is reduced, so that the service life of the heightened valve is improved.

[0010] As a further preference of the present invention, the three-claw connecting disk includes a disk body and a disk body claw, the disk body claw is arranged on one end face of the disk body, the disk body claw has three pieces, and the three disk body claws are evenly distributed around the central axis of the disk body. The center position of the disk body of the three-claw connecting disk arranged at the bottom of the transmission shaft is provided with a connecting disk valve stem passing opening, and the top surface of the valve stem nut is provided with a nut three claws, and the nut three claws are staggered with the disk body claws, and the nut three claws can just be stuck in and fill the three-claw groove formed by the disk body claws and the disk body end face, and the three-claw connecting disk at the top of the transmission shaft is clamped with the driver output three claws arranged at the output end of the driver output structure, and the driver output three claws are staggered with the disk body claws, and the driver output three claws can just be stuck in and fill the three-claw groove formed by the disk body claws and the disk body end face.

[0011] The intervals between the three disc body claws on the disc body in the circumferential direction of the disc body are 120°.

[0012] As a further preference of the present invention, the aperture of the nut hole of the valve stem nut is adapted to the outer diameter of the valve stem, the inner wall of the nut hole of the valve stem nut is provided with an internal thread, and the outer wall of the valve stem is provided with an external thread adapted to the internal thread of the nut hole of the valve stem nut, the valve stem is inserted into the nut hole position of the valve stem nut, and the valve stem nut and the valve stem are engaged and connected by the internal thread and the external thread.

[0013] As a further preferred embodiment of the present invention, both the internal thread and the external thread are trapezoidal threads.

[0014] The cross-section of the trapezoidal thread is trapezoidal, and the tooth height of the trapezoidal thread is relatively low, so it is more effective in transmitting torque, and also has better wear resistance and fatigue resistance. The transmission efficiency of the trapezoidal thread is higher, so the trapezoidal thread is selected here.

[0015] As a further preferred embodiment of the present invention, the pressure plate is detachably connected to the bottom of the extended outer bracket via a hexagon socket bolt.

[0016] As a further preference of the present invention, the seat ring of the top sliding bearing and the seat ring of the bottom sliding bearing are respectively connected to the top surface of the bearing boss and the bottom surface of the bearing boss, and the shaft ring of the top sliding bearing and the shaft ring of the bottom sliding bearing are respectively connected to the limit platform and the pressure plate on the inner surface of the nut mounting section.

[0017] The top sliding bearing and the bottom bearing are both common thrust bearings, and their main structure is a shaft ring, a retaining frame and a seat ring arranged in sequence.

[0018] As a further preference of the present invention, a valve stem oiling ring is fixed in the hollow cavity of the transmission shaft, and the valve stem oiling ring includes a ring body and bristles densely distributed on the inner wall of the ring body, the inner ends of the bristles can touch the outer wall of the valve stem, the height of the ring body does not exceed the maximum height to which the top of the valve stem can be lifted, and a lubricating oil annular channel is provided in the ring body around the center hole of the ring body, and lubricating oil immersion outlets are evenly provided on the inner wall of the ring body, and the lubricating oil immersion outlets are all connected to the lubricating oil annular channel, and an inner oil supply pipe connected to the lubricating oil annular channel is also provided on the outside of the lubricating oil annular channel in the ring body, and the inner supply pipe is provided. The oil pipe extends outward to the outer wall of the drive shaft, and a positioning connecting pipe is provided at a position where the bracket wall of the extended outer bracket is opposite to the inner oil supply pipe. The positioning connecting pipe is perpendicular to the bracket wall of the extended outer bracket, and the positioning connecting pipe is threadedly connected to the bracket wall of the extended outer bracket. The inner end of the positioning connecting pipe can be extended into the pipeline of the inner oil supply pipe, and a section of the positioning connecting pipe extending into the pipeline of the inner oil supply pipe is also threadedly connected to the inner oil supply pipe, and the outer end of the positioning connecting pipe is connected to the oil supply nozzle. The top surface of the extended outer bracket and the top surface of the three-claw connecting plate at the top of the drive shaft are provided with alignment marks for positioning the positioning connecting pipe.

[0019] During use, in order to reduce the friction between the valve stem and the stem nut and increase the service life of the valve stem and the stem nut, it is necessary to apply lubricating oil to the surface of the valve stem. However, the lubricating oil will become less over time. Therefore, in order to replenish the lubricating oil, it is necessary to regularly replenish the lubricating oil between the valve stem and the stem nut. However, there is no corresponding lubricating oil replenishing structure in the existing structure to support the replenishment of lubricating oil. As a result, the friction between the valve stem and the stem nut will increase over time, affecting the service life of the valve stem and the stem nut. Moreover, it will become more difficult to rotate the valve stem nut after a long time of use, and a greater force will be required. In order to solve this problem, the present invention is proposed. In the scheme, a valve stem oiling ring is set in the hollow cavity of the transmission shaft. When lubricating oil needs to be applied to the surface of the transmission shaft regularly, first, the valve stem is reset, that is, the valve stem is lowered to the lowest position, and then the transmission shaft is re-controlled to rotate through the driver control, and the valve stem is lifted until its top is flush with the valve stem oiling ring. The valve stem is lifted from the initial position to a fixed height. The number of turns of the transmission shaft controlled by the driver is fixed, which can be determined when the structure is designed. After the driver controls the transmission shaft to rotate a fixed number of turns, it is also necessary to observe whether the alignment mark on the top surface of the three-claw connecting plate is aligned with the alignment mark on the top surface of the extended outer bracket. If they are not aligned, the driver needs to be used again. The actuator is used to fine-tune it. When the alignment mark on the top surface of the three-claw connecting disk is aligned with the alignment mark on the top surface of the extended outer bracket, the drive is stopped, and the operator goes down the well, then holds the oil supply nozzle and rotates it. The rotation of the oil supply nozzle can send the inner end of the positioning connecting pipe into the pipeline of the inner oil supply pipe. After the positioning connecting pipe is sent to the position, the lubricating oil is injected into the oil supply nozzle using the oil injector. The lubricating oil enters the lubricating oil annular channel along the positioning connecting pipe and the inner oil supply pipe, and then gushes out from the lubricating oil immersion outlet. The gushing lubricating oil is evenly dispersed under the action of the brush, and then the continuously injected lubricating oil will flow evenly along the surface of the valve stem under the action of gravity, thus aligning the valve stem surface. The lubricating oil on the surface is replenished to avoid the problem of increased friction between the valve stem and the valve stem nut due to the reduction of lubricating oil after long-term use, so that the rotation between the valve stem and the valve stem nut can maintain a silky smooth state for a long time. After the replenishment is completed, the oiler is removed from the oil supply nozzle. The oiler here is a conventional pressurized oiler. After removing the oiler, block the oil supply nozzle, and then manually hold the oil supply nozzle and rotate it to withdraw the inner end of the positioning connecting pipe from the inner oil supply pipe. The entire lubricating oil adding process is completed. The bottom surface of the inner cavity of the positioning connecting pipe and the bottom surface of the inner cavity of the inner oil supply pipe are both tilted downward from the outside to the inside, so that the lubricating oil is convenient to flow from the oil supply nozzle into the lubricating oil annular channel.

[0020] As a further preference of the present invention, a guide rod is vertically provided in the hollow cavity of the transmission shaft along the center line, the top surface of the guide rod is fixedly connected to the bottom surface of the three-claw connecting plate at the top of the transmission shaft, the bottom surface of the guide rod is flush with the opening of the connecting plate valve stem, and a guide hole adapted to the guide rod is provided on the top surface of the valve stem facing the guide rod.

[0021] In order to further reduce the wear of the valve stem during the lifting process, it is necessary to make the lifting of the valve stem more stable, and set a guide rod in the inner cavity of the drive shaft. In this way, when the valve stem is lifted, the guide rod enters the guide hole, which can guide the valve stem well and reduce the shaking problem of the valve stem during the lifting process. This effectively reduces the friction between the valve stem and the valve stem nut, and further improves the service life of the valve stem and the valve stem nut.

[0022] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0023] 1. In this solution, the valve stem is not directly lengthened. Instead, the long-distance drive of the valve stem is completed by lengthening the outer bracket, the transmission shaft and the valve stem nut. When the device is used, the output end of the driver needs to be connected to the three-claw connection disk at the top of the transmission shaft. The driver used here can be an ordinary handwheel drive mechanism or a conventional electric driver. After connecting the corresponding driver, the lift of the valve stem can be controlled by the driver. When controlling the lift of the valve stem, the driving force of the driver is input by the three-claw connection disk at the top of the transmission shaft, which drives the transmission shaft to rotate. Since the bottom of the transmission shaft is connected to the valve stem nut through the three-claw connection disk, Therefore, when the drive shaft rotates, it can drive the valve stem nut to rotate, and the valve stem nut engages with the valve stem, so the valve stem can be raised and lowered under the action of the valve stem nut. According to the height at which the valve is installed at the wellhead or underground, the length of the outer bracket and the drive shaft can be adjusted and extended in advance, so that the valve at the wellhead or underground can be operated on the ground. Through the solution in this application, the conventional problem of directly lengthening the valve stem, resulting in excessive valve stem disturbance, valve stem bending and deformation causing valve jamming and inability to switch normally, is avoided. At the same time, because the valve stem is not lengthened, the wear of the valve stem during the transmission process is reduced, so that the service life of the heightened valve is improved.

[0024] 2. The cross-section of the trapezoidal thread is trapezoidal, and the tooth height of the trapezoidal thread is relatively low, so it is more effective in transmitting torque, and also has better wear resistance and fatigue resistance. The transmission efficiency of the trapezoidal thread is higher, so the trapezoidal thread is selected here.

[0025] 3. During use, in order to reduce the friction between the valve stem and the stem nut and increase the service life of the valve stem and the stem nut, it is necessary to apply lubricating oil to the surface of the valve stem. However, the lubricating oil will become less over time. Therefore, in order to replenish the lubricating oil, it is necessary to regularly replenish the lubricating oil between the valve stem and the stem nut. However, there is no corresponding lubricating oil replenishing structure in the existing structure to support the replenishment of lubricating oil. As a result, the friction between the valve stem and the stem nut will increase over time, affecting the service life of the valve stem and the stem nut. Moreover, it will become more difficult to rotate the stem nut after a long time of use, and a greater force needs to be output. In order to solve this problem In this solution, a valve stem oiling ring is set in the hollow cavity of the transmission shaft. When lubricating oil needs to be applied to the surface of the transmission shaft regularly, first, reset the valve stem, that is, lower the valve stem to the lowest position, and then re-control the rotation of the transmission shaft through the driver control, lift the valve stem until its top is flush with the valve stem oiling ring, and lift the valve stem from the initial position to a fixed height. The number of circles of the transmission shaft controlled by the driver is fixed, which can be determined when designing the structure. After the driver controls the transmission shaft to rotate a fixed number of circles, it is also necessary to observe whether the alignment mark on the top surface of the three-claw connecting plate is aligned with the alignment mark on the top surface of the extended outer bracket. If they are not aligned, it is necessary to pass The driver makes fine adjustments to it. When the alignment mark on the top surface of the three-claw connecting plate is aligned with the alignment mark on the top surface of the extended outer bracket, the driver stops driving, and the operator goes down to the well, then holds the oil supply nozzle and rotates it. The rotation of the oil supply nozzle can send the inner end of the positioning connecting pipe into the pipeline of the inner oil supply pipe. After the positioning connecting pipe is sent to the position, the lubricating oil is injected into the oil supply nozzle using the oil injector. The lubricating oil enters the lubricating oil annular channel along the positioning connecting pipe and the inner oil supply pipe, and then gushes out from the lubricating oil immersion outlet. The gushing lubricating oil is evenly dispersed under the action of the brush, and then the continuously injected lubricating oil will flow evenly along the surface of the valve stem under the action of gravity, thus aligning the valve stem. The lubricating oil on the surface is replenished, which avoids the problem of increased friction between the valve stem and the valve stem nut due to the reduction of lubricating oil after long-term use, so that the rotation between the valve stem and the valve stem nut can maintain a silky smooth state for a long time. After the replenishment is completed, the oiler is removed from the oil supply nozzle. The oiler here is a conventional pressurized oiler. After removing the oiler, block the oil supply nozzle, and then manually hold the oil supply nozzle and rotate it to withdraw the inner end of the positioning connecting pipe from the inner oil supply pipe, thus completing the entire lubricating oil adding process. The bottom surface of the inner cavity of the positioning connecting pipe and the bottom surface of the inner cavity of the inner oil supply pipe are both tilted downward from the outside to the inside, so that the lubricating oil can flow from the oil supply nozzle into the lubricating oil annular channel.

[0026] 4. In order to further reduce the wear of the valve stem during the lifting process, it is necessary to make the lifting of the valve stem more stable and set a guide rod in the inner cavity of the drive shaft. In this way, when the valve stem is lifted, the guide rod enters the guide hole, which can guide the valve stem well and reduce the vibration of the valve stem during the lifting process. This effectively reduces the friction between the valve stem and the valve stem nut, and further improves the service life of the valve stem and the valve stem nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of the present utility model.

[0028] Figure 2 This is a schematic diagram of the structure of the three-claw connecting disc on the top of the transmission shaft of the utility model.

[0029] Figure 3 It is a three-claw connecting disc at the bottom of the transmission shaft of the utility model.

[0030] Figure 4 It is a schematic diagram of the longitudinal cross-section structure of the valve stem nut of the utility model.

[0031] Figure 5 This is a structural schematic diagram of the top surface of the valve stem nut of the utility model.

[0032] Figure 6 This is a structural schematic diagram of the valve stem oiling ring of the utility model.

[0033] Figure 7 This is a structural diagram of the valve stem of the utility model. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0038] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the present invention is typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances. Specific embodiment 1:

[0041] Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7The invention discloses an extended transmission device for a multi-turn valve, comprising an extended outer bracket 1, a valve stem nut 2 and a transmission shaft 3. The extended outer bracket 1 has an installation cavity inside the frame, and the horizontal cross-section of the installation cavity is circular. The installation cavity comprises an extended section and a nut installation section arranged in sequence from top to bottom. The transmission shaft 3 and the valve stem nut 2 are rotatably arranged in the extended section and the nut installation section of the installation cavity, respectively. The transmission shaft 3 is a hollow cylinder, and the outer wall of the transmission shaft 3 fits with the inner wall of the installation cavity. Three-claw connecting plates 4 are fixed at both ends of the transmission shaft 3. The lower end of the transmission shaft 3 is connected to the valve stem nut through the three-claw connecting plate 4. The mother 2 is clamped, and a connecting disc valve stem passage opening 43 is provided at the center position of the three-claw connecting disc 4 that is clamped with the valve stem nut 2. The valve stem nut 2 is meshed with the valve stem 5 through the nut hole. A bearing boss 6 arranged around the outer wall is fixed to the middle part of the outer wall of the valve stem nut 2. The top and bottom surfaces of the bearing boss 6 are respectively installed with a top sliding bearing 7 and a bottom sliding bearing 8. The top surface of the top sliding bearing 7 is connected to the limit platform 9 on the inner surface of the nut mounting section, and the bottom surface of the bottom sliding bearing 8 is connected to the pressure plate 10 fixed to the bottom of the extended outer bracket 1. The center position of the pressure plate 10 is provided with a pressure plate valve stem passage opening.

[0042] In this solution, the valve stem is not directly lengthened. Instead, the long-distance drive of the valve stem is completed by lengthening the outer bracket, the transmission shaft and the valve stem nut. When the device is used, the output end of the driver needs to be connected to the three-claw connecting disc at the top of the transmission shaft. The driver used here can be an ordinary handwheel drive mechanism or a conventional electric driver. After connecting the corresponding driver, the lifting and lowering of the valve stem can be controlled by the driver. When controlling the lifting and lowering of the valve stem, the driving force of the driver is input by the three-claw connecting disc at the top of the transmission shaft, which drives the transmission shaft to rotate. Since the bottom of the transmission shaft is connected to the valve stem nut through the three-claw connecting disc, When this drive shaft rotates, it can drive the valve stem nut to rotate, and the valve stem nut engages with the valve stem, so the valve stem can be raised and lowered under the action of the valve stem nut. According to the height at which the valve is installed at the wellhead or underground, the length of the outer bracket and the drive shaft can be adjusted in advance to achieve ground operation of the wellhead or underground valve. Through the solution in this application, the conventional problem of directly lengthening the valve stem, which causes excessive valve stem disturbance and valve stem bending and deformation causing valve jamming and inability to switch normally, is avoided. At the same time, because the valve stem is not lengthened, the wear of the valve stem during the transmission process is reduced, so that the service life of the heightened valve is improved. Specific embodiment 2:

[0044] This embodiment further illustrates the three-claw connecting disc 4 on the basis of the specific embodiment 1. The three-claw connecting disc 4 includes a disc body 41 and a disc body claw 42. The disc body claw 42 is arranged on one end surface of the disc body 41. The disc body claw 42 has three pieces. The three disc body claws 42 are evenly arranged around the central axis of the disc body 41. The disc body 41 of the three-claw connecting disc 4 at the bottom of the transmission shaft 3 is provided with a connecting disc valve stem through opening 43 at the center position. The top surface of the valve stem nut 2 is provided with a connecting disc valve stem through opening 43. There are three nut claws 21, which are staggered with the disc claws 42. The three nut claws 21 can just fit into and fill the three-claw slot formed by the disc claws 42 and the end face of the disc 41. The three-claw connecting disk 4 at the top of the transmission shaft 3 is engaged with the driver output three claws arranged at the output end of the driver output structure. The driver output three claws are staggered with the disc claws 42. The driver output three claws can just fit into and fill the three-claw slot formed by the disc claws 42 and the end face of the disc 41.

[0045] The intervals between the three disc body claws on the disc body in the circumferential direction of the disc body are 120°. Specific embodiment 3:

[0047] This embodiment further illustrates the valve stem nut 2 based on the specific embodiment 1. The nut hole diameter of the valve stem nut 2 is adapted to the outer diameter of the valve stem 5. The inner wall of the nut hole of the valve stem nut 2 is provided with an internal thread, and the outer wall of the valve stem 5 is provided with an external thread adapted to the internal thread of the nut hole of the valve stem nut 2. The valve stem 5 is inserted into the nut hole position of the valve stem nut 2, and the valve stem nut 2 and the valve stem 5 are engaged and connected by the internal thread and the external thread. Specific embodiment 4:

[0049] This embodiment further illustrates the internal thread and the external thread on the basis of the specific embodiment 3, wherein both the internal thread and the external thread are trapezoidal threads.

[0050] The cross-section of the trapezoidal thread is trapezoidal, and the tooth height of the trapezoidal thread is relatively low, so it is more effective in transmitting torque, and also has better wear resistance and fatigue resistance. The transmission efficiency of the trapezoidal thread is higher, so the trapezoidal thread is selected here. Specific embodiment 5:

[0052] This embodiment further illustrates the pressing plate 10 based on the specific embodiment 1. The pressing plate 10 is detachably connected to the bottom of the extended outer bracket 1 through the hexagon socket bolts 11. Specific embodiment 6:

[0054] This embodiment further explains the table top sliding bearing 7 and the table bottom sliding bearing 8 on the basis of specific embodiment 1. The seat ring of the table top sliding bearing 7 and the seat ring of the table bottom sliding bearing 8 are respectively connected to the top surface of the bearing boss 6 and the bottom surface of the bearing boss 6, and the shaft ring of the table top sliding bearing 7 and the shaft ring of the table bottom sliding bearing 8 are respectively connected to the limit platform 9 and the pressure plate 10 on the inner surface of the nut mounting section.

[0055] The top sliding bearing and the bottom bearing are both common thrust bearings, and their main structure is a shaft ring, a retaining frame and a seat ring arranged in sequence. Specific embodiment 7:

[0057] This embodiment further explains the transmission shaft 3 on the basis of the specific embodiment 1. A valve stem oiling ring 12 is fixed in the hollow cavity of the transmission shaft 3. The valve stem oiling ring 12 includes a ring body and bristles densely distributed on the inner wall of the ring body. The inner ends of the bristles can touch the outer wall of the valve stem. The height of the ring body does not exceed the maximum height to which the top of the valve stem can be lifted. A lubricating oil annular channel 121 is provided in the ring body around the center hole of the ring body. Lubricating oil immersion outlets are evenly provided on the inner wall of the ring body. The lubricating oil immersion outlets are all connected to the lubricating oil annular channel 121. The outer side of the lubricating oil annular channel 121 in the ring body is also provided with an internal oil supply pipe 13 connected to the lubricating oil annular channel 121. The inner oil supply pipe 13 extends outward to the outer wall of the transmission shaft 3. A positioning connecting pipe 14 is provided at the position of the bracket wall of the extended outer bracket 1 facing the inner oil supply pipe 13. The positioning connecting pipe 14 is perpendicular to the bracket wall of the extended outer bracket 1. The positioning connecting pipe 14 is threadedly connected to the bracket wall of the extended outer bracket 1. The inner end of the positioning connecting pipe 14 can be extended into the pipeline of the inner oil supply pipe 13. The section of the positioning connecting pipe 14 extending into the pipeline of the inner oil supply pipe 13 is also threadedly connected to the inner oil supply pipe 13. The outer end of the positioning connecting pipe 14 is connected to the oil supply nozzle 15. The top surface of the extended outer bracket 1 and the top surface of the three-claw connecting plate at the top of the transmission shaft 3 are provided with alignment marks for positioning the positioning connecting pipe 14.

[0058] During use, in order to reduce the friction between the valve stem and the stem nut and increase the service life of the valve stem and the stem nut, it is necessary to apply lubricating oil to the surface of the valve stem. However, the lubricating oil will become less over time. Therefore, in order to replenish the lubricating oil, it is necessary to regularly replenish the lubricating oil between the valve stem and the stem nut. However, there is no corresponding lubricating oil replenishing structure in the existing structure to support the replenishment of lubricating oil. As a result, the friction between the valve stem and the stem nut will increase over time, affecting the service life of the valve stem and the stem nut. Moreover, it will become more difficult to rotate the valve stem nut after a long time of use, and a greater force will be required. In order to solve this problem, the present invention is proposed. In the scheme, a valve stem oiling ring is set in the hollow cavity of the transmission shaft. When lubricating oil needs to be applied to the surface of the transmission shaft regularly, first, the valve stem is reset, that is, the valve stem is lowered to the lowest position, and then the transmission shaft is re-controlled to rotate through the driver control, and the valve stem is lifted until its top is flush with the valve stem oiling ring. The valve stem is lifted from the initial position to a fixed height. The number of turns of the transmission shaft controlled by the driver is fixed, which can be determined when the structure is designed. After the driver controls the transmission shaft to rotate a fixed number of turns, it is also necessary to observe whether the alignment mark on the top surface of the three-claw connecting plate is aligned with the alignment mark on the top surface of the extended outer bracket. If they are not aligned, the driver needs to be used again. The actuator is used to fine-tune it. When the alignment mark on the top surface of the three-claw connecting disk is aligned with the alignment mark on the top surface of the extended outer bracket, the drive is stopped, and the operator goes down the well, then holds the oil supply nozzle and rotates it. The rotation of the oil supply nozzle can send the inner end of the positioning connecting pipe into the pipeline of the inner oil supply pipe. After the positioning connecting pipe is sent to the position, the lubricating oil is injected into the oil supply nozzle using the oil injector. The lubricating oil enters the lubricating oil annular channel along the positioning connecting pipe and the inner oil supply pipe, and then gushes out from the lubricating oil immersion outlet. The gushing lubricating oil is evenly dispersed under the action of the brush, and then the continuously injected lubricating oil will flow evenly along the surface of the valve stem under the action of gravity, thus aligning the valve stem surface. The lubricating oil on the surface is replenished to avoid the problem of increased friction between the valve stem and the valve stem nut due to the reduction of lubricating oil after long-term use, so that the rotation between the valve stem and the valve stem nut can maintain a silky smooth state for a long time. After the replenishment is completed, the oiler is removed from the oil supply nozzle. The oiler here is a conventional pressurized oiler. After removing the oiler, block the oil supply nozzle, and then manually hold the oil supply nozzle and rotate it to withdraw the inner end of the positioning connecting pipe from the inner oil supply pipe. The entire lubricating oil adding process is completed. The bottom surface of the inner cavity of the positioning connecting pipe and the bottom surface of the inner cavity of the inner oil supply pipe are both tilted downward from the outside to the inside, so that the lubricating oil is convenient to flow from the oil supply nozzle into the lubricating oil annular channel. Specific embodiment 8:

[0060] This embodiment further explains the transmission shaft 3 on the basis of specific embodiment 7. A guide rod 16 is vertically provided in the hollow cavity of the transmission shaft 3 along the center line. The top surface of the guide rod 16 is fixedly connected to the bottom surface of the three-claw connecting disk 4 at the top of the transmission shaft 3. The bottom surface of the guide rod 16 is flush with the valve stem of the connecting disk through the opening 43. The top surface of the valve stem 5 is opposite to the guide rod 16 and is provided with a guide hole 51 adapted to the guide rod 16.

[0061] In order to further reduce the wear of the valve stem during the lifting process, it is necessary to make the lifting of the valve stem more stable, and set a guide rod in the inner cavity of the drive shaft. In this way, when the valve stem is lifted, the guide rod enters the guide hole, which can guide the valve stem well and reduce the shaking problem of the valve stem during the lifting process. This effectively reduces the friction between the valve stem and the valve stem nut, and further improves the service life of the valve stem and the valve stem nut.

[0062] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An extended transmission device for a multi-turn valve, characterized in that: The invention comprises an extended outer bracket (1), a valve stem nut (2) and a transmission shaft (3), wherein the frame body of the extended outer bracket (1) is a mounting cavity, the horizontal cross section of the mounting cavity is circular, the mounting cavity comprises an extended section and a nut mounting section arranged in sequence from top to bottom, the transmission shaft (3) and the valve stem nut (2) are rotatably arranged in the extended section and the nut mounting section of the mounting cavity respectively, the transmission shaft (3) is a hollow cylinder, the outer wall of the transmission shaft (3) is fitted with the inner wall of the mounting cavity, and three-claw connecting discs (4) are fixed at both ends of the transmission shaft (3), the lower end of the transmission shaft (3) is clamped with the valve stem nut (2) through the three-claw connecting disc (4), and is clamped with the valve stem nut (2) A connecting disc valve stem passage opening (43) is provided at the center of the three-claw connecting disc (4) that is clamped, and the valve stem nut (2) is engaged with the valve stem (5) through the nut hole, and a bearing boss (6) arranged around the outer wall of the valve stem nut (2) is fixed in the middle of the outer wall, and a top sliding bearing (7) and a bottom sliding bearing (8) are respectively installed on the top and bottom surfaces of the bearing boss (6), and the top surface of the top sliding bearing (7) is connected to the limit platform (9) on the inner surface of the nut mounting section, and the bottom surface of the bottom sliding bearing (8) is connected to the pressure plate (10) fixed at the bottom of the extended outer bracket (1), and the center position of the pressure plate (10) is provided with a pressure plate valve stem passage opening.

2. The extended transmission device for a multi-turn valve according to claim 1, characterized in that: The three-claw connecting disk (4) comprises a disk body (41) and a disk body claw (42), wherein the disk body claw (42) is arranged on one end surface of the disk body (41), and the disk body claw (42) comprises three pieces, and the three pieces of disk body claw (42) are evenly arranged around the central axis of the disk body (41). A connecting disk valve stem passage opening (43) is provided at the center position of the disk body (41) of the three-claw connecting disk (4) arranged at the bottom of the transmission shaft (3), and a nut three-claw (21) is provided on the top surface of the valve stem nut (2). The nut three-claw (21) is provided on the top surface of the valve stem nut (2). The three claws of the nut (21) are staggered with the claws (42) of the disk body, and the three claws of the nut can just fit into and fill the three claw slot formed by the claws (42) of the disk body and the end face of the disk body (41). The three claw connecting disk (4) on the top of the transmission shaft (3) is engaged with the driver output three claws arranged at the output end of the driver output structure. The driver output three claws are staggered with the claws (42) of the disk body, and the three claws of the driver output can just fit into and fill the three claw slot formed by the claws (42) of the disk body and the end face of the disk body (41).

3. The extended transmission device for a multi-turn valve according to claim 1, characterized in that: The nut hole diameter of the valve stem nut (2) is adapted to the outer diameter of the valve stem (5), the inner wall of the nut hole of the valve stem nut (2) is provided with an internal thread, and the outer wall of the valve stem (5) is provided with an external thread adapted to the internal thread of the nut hole of the valve stem nut (2), the valve stem (5) is inserted into the nut hole position of the valve stem nut (2), and the valve stem nut (2) and the valve stem (5) are engaged and connected by the internal thread and the external thread.

4. The extended transmission device for a multi-rotation valve according to claim 3, characterized in that: The internal thread and the external thread are both trapezoidal threads.

5. The extended transmission device for a multi-turn valve according to claim 1, characterized in that: The pressing plate (10) is detachably connected to the bottom of the extended outer bracket (1) via a hexagon socket bolt (11).

6. The extended transmission device for a multi-turn valve according to claim 1, characterized in that: The seat ring of the platform top sliding bearing (7) and the seat ring of the platform bottom sliding bearing (8) are respectively connected to the top surface of the bearing boss (6) and the bottom surface of the bearing boss (6), and the shaft ring of the platform top sliding bearing (7) and the shaft ring of the platform bottom sliding bearing (8) are respectively connected to the limit platform (9) and the pressure plate (10) on the inner surface of the nut mounting section.

7. The extended transmission device for a multi-rotation valve according to claim 1, characterized in that: A valve stem oiling ring (12) is fixed in the hollow cavity of the transmission shaft (3), and the valve stem oiling ring (12) includes a ring body and bristles densely distributed on the inner wall of the ring body, the inner ends of the bristles can touch the outer wall of the valve stem, and the height of the ring body does not exceed the maximum height to which the top of the valve stem can be lifted. A lubricating oil annular channel (121) is opened around the center hole of the ring body in the ring body, and lubricating oil immersion outlets are evenly provided on the inner wall of the ring body, and the lubricating oil immersion outlets are all connected to the lubricating oil annular channel (121). The outer side of the lubricating oil annular channel (121) in the ring body is also provided with an inner oil supply pipe (13) connected to the lubricating oil annular channel (121), and the inner oil supply pipe (13) extends outward to the outer wall of the transmission shaft (3). The extended outer A positioning connecting pipe (14) is provided at a position of the bracket wall of the bracket (1) facing the inner oil supply pipe (13), the positioning connecting pipe (14) is perpendicular to the bracket wall of the extended outer bracket (1), the positioning connecting pipe (14) and the bracket wall of the extended outer bracket (1) are threadedly connected, the inner end of the positioning connecting pipe (14) can be extended into the pipeline of the inner oil supply pipe (13), the section of the positioning connecting pipe (14) extending into the pipeline of the inner oil supply pipe (13) is also threadedly connected to the inner oil supply pipe (13), and the outer end of the positioning connecting pipe (14) is connected to the oil supply nozzle (15), and the top surface of the extended outer bracket (1) and the top surface of the three-claw connecting plate at the top of the transmission shaft (3) are both provided with alignment marks for positioning the positioning connecting pipe (14).

8. The extended transmission device for a multi-rotation valve according to claim 7, characterized in that: A guide rod (16) is vertically provided in the hollow cavity of the transmission shaft (3) along the center line. The top surface of the guide rod (16) is fixedly connected to the bottom surface of the three-claw connecting disk (4) at the top of the transmission shaft (3). The bottom surface of the guide rod (16) is flush with the valve stem of the connecting disk through the opening (43). A guide hole (51) adapted to the guide rod (16) is provided on the top surface of the valve stem (5) facing the guide rod (16).

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