Polish rod sealing self-tightening device

Abstract

The utility model relates to the technical field of well mouth packing boxes, in particular to a polish rod sealing self-tightening device, which comprises a packing box, a gland, a supporting seat, a driven gear, an adjusting mechanism, a driving gear and a driving motor, a sealing packing is arranged in the packing box, and a pressing sleeve with the lower part sleeved in the packing box is arranged at the upper end of the sealing packing. The polish rod sealing and self-tightening device is reasonable and compact in structure and suitable for various packing boxes of oil extraction well mouths, the packing boxes do not need to be greatly improved, only the gland needs to be machined, when the sealing packing in the field leaks in a piercing mode, under the condition that an oil pumping unit does not stop pumping, the sealing packing can be fastened after the driving motor works, and therefore the sealing and self-tightening effect is achieved. The well mouth sealing device can replace field oil production worker packing fastening operation, is suitable for well mouth sealing under various working conditions, improves safety and high efficiency of well mouth sealing in the oil production process, can be popularized and used in oil fields at home and abroad, and has good development prospects.

Description

Technical Field

[0001] The utility model relates to the technical field of wellhead packing boxes and is a polished rod sealing self-tightening device. Background Art

[0002] In the daily production and operation of oil fields, the wellhead of oil wells is required to maintain a sealed state to ensure safe production and prevent environmental pollution caused by running, bubbling, puncture and leakage. In the process of mechanical oil production, when the wire rope of the pumping unit reciprocates up and down on the light rod, the movement trajectory is uncertain due to the large change in the load of the light rod, and the friction between the light rod and the packing is uncertain. Coupled with the influence of other factors, the probability of eccentric wear of the wellhead sealing packing is relatively high, which is the main cause of wellhead sealing failure, wellhead oil leakage and environmental pollution. When the packing is found to be punctured on site, the oil production workers usually tighten the wellhead packing without stopping the machine to prevent and stop the packing from continuing to puncture. This operation is affected by many uncertain factors such as the number of wellhead equipment managed by the employees, the operating experience of the personnel, and the timeliness of the operation. Wellhead oil leakage and environmental pollution cannot be effectively prevented. Therefore, it is necessary to develop packing tightening control technology to achieve automatic tightening of the packing box after the packing is punctured, effectively preventing the packing from continuing to puncture.

[0003] The Chinese patent document with the announcement number CN219711479U discloses an intelligent packing box for oil wells based on machine vision, including an oil well rubber valve, a packing box assembly is installed on the oil well rubber valve, the upper end of the packing box assembly is threadedly connected with an upper pressure cap, and the upper pressure cap can squeeze the packing in the packing box assembly during the downward rotation of the packing box assembly. The upper part of the packing box assembly is located in a shell, and the shell is fixedly connected to the packing box assembly. A window is opened at the upper end of the shell, and a polished rod passes through the shell and the packing box assembly. and an oil well rubber valve, a driven gear is fixed on the upper pressure cap, a stepper motor is fixed on the upper end of the shell, a driving gear is rotatably connected in the shell, the driving gear is fixedly connected to the output shaft of the stepper motor, the driven gear is meshed with the driving gear, an industrial CCD camera is fixed on the shell, the industrial CCD camera can take pictures of the image on the upper end of the upper pressure cap, the industrial CCD camera is electrically connected to the measurement and control terminal, the measurement and control terminal is electrically connected to the stepper motor, and the measurement and control terminal is communicatively connected to the handheld terminal through a wireless communication module.

[0004] The Chinese patent document with the announcement number CN217859841U discloses an intelligent remote packing tightening device for an oil pumping unit, which is provided with a driving motor, a driving wheel and a driven wheel. The driving wheel is mounted on the motor shaft of the driving motor and meshes with the driven wheel fixed to the outside of the packing box tightening clamping table; the fixing bolts are installed in the fixing bolt holes of the upper body of the packing box tightening clamping table, and the packing box tightening clamping table and the tightening end cap of the wellhead packing box are clamped together by the fixing bolts; the driving wheel and the packing box tightening clamping table are both installed in a protective cover, and the packing box tightening clamping table and the protective cover are connected. A bearing is installed; a CO2 tester is installed on the top of the protective cover and a contact is installed on the bottom, and the lower part of one side of the protective cover is fixed on the driving motor; a battery box is fixed on one side of the driving motor, and a receiving controller is fixed on the battery box; the contact and the CO2 tester are electrically connected to the receiving controller through wires respectively, the connecting wires of the batteries in the battery box are electrically connected to the receiving controller and the driving motor, and the receiving controller is electrically connected to the junction box of the driving motor; the packing tightening device is fixed to the outside of the rubber valve in the oil production tree below the wellhead packing box by a fixing clip and the light rod can pass through it.

[0005] Although the current self-tightening device for light rod sealing can realize the automatic up and down movement of the gland, when the packing needs to be replaced, the housing and the motor need to be removed, which is troublesome to disassemble and assemble. In addition, the assembly clearance between the driving gear and the driven gear is not convenient to adjust, and maintenance is troublesome. Summary of the invention

[0006] The utility model provides a polished rod sealing self-tightening device, which overcomes the above-mentioned shortcomings of the prior art and can effectively solve the problem that the existing polished rod sealing self-tightening device is troublesome to disassemble and assemble when replacing the packing.

[0007] The technical scheme of the utility model is realized through the following measures: a kind of light rod sealing self-tightening device, comprising a packing box, a pressure cover, a support seat, a driven gear, an adjusting mechanism, a driving gear and a driving motor, wherein a sealing packing is arranged in the packing box, the upper end of the sealing packing is provided with a compression sleeve which is sleeved in the packing box at the lower end, the inner side of the pressure cover is screwed with the outer side of the upper part of the packing box, the outer side of the pressure cover is detachably fixed with a driven gear, the outer side of the lower part of the packing box is fixed with a supporting boss which is narrow at the top and wide at the bottom, the upper side of the rear part of the support seat is provided with a mounting hole which passes through the upper and lower parts, the outer side of the upper part of the supporting boss is located in the mounting hole, the driving motor is fixedly installed on the lower side of the front part of the support seat, the upper end of the output shaft of the driving motor passes through the upper side of the support seat and is fixedly installed with the driving gear, the driving gear and the driven gear are meshed with each other, and an adjusting mechanism which can make the support seat move forward and backward and limit the position is provided between the support seat and the support boss.

[0008] The following are further optimizations and / or improvements to the above utility model technical solution:

[0009] Furthermore, a plurality of positioning grooves opening upward are provided at intervals along the circumference on the outer side of the lower part of the pressure cover, a clamping block matching the positioning groove is fixed on the inner side of the driven gear, the driven gear is clamped on the outer side of the lower part of the pressure cover, and a limiting ring groove is provided on the outer side of the lower part of the pressure cover corresponding to the upper end position of the driven gear, and a retaining spring is installed in the limiting ring groove.

[0010] Furthermore, the adjustment mechanism includes an adjusting top screw, two guide steps are symmetrically provided on the left and right outer sides of the upper part of the support boss, the mounting hole is rectangular, the width of the mounting hole matches the spacing between the vertical surfaces of the two guide steps, the length of the mounting hole is greater than the outer diameter of the support boss, the support seat is mounted on the outer side of the upper part of the support boss and can move forward and backward along the guide steps, an adjusting screw hole connected to the mounting hole is provided on the rear side of the support seat, an adjusting top screw is threaded in the adjusting screw hole, a locking screw hole is provided on the rear side of the support boss corresponding to the position of the adjusting screw hole, and the front end outer side of the adjusting top screw is threaded in the locking screw hole.

[0011] Furthermore, two limiting steps are symmetrically arranged on the outer side of the upper portion of the supporting boss, and the distance between the vertical surfaces of the two limiting steps is smaller than the length of the mounting hole.

[0012] Furthermore, the tooth width of the driven gear is 10 to 20 mm, and the sum of the stroke height and the tooth width of the driven gear is smaller than the tooth width of the driving gear.

[0013] Furthermore, it also includes a battery module, a solar power generation module and a control module, the solar power generation module is connected to the battery module, the battery module is connected to the control module, and the control module is connected to the drive motor.

[0014] The utility model has a reasonable and compact structure. The light rod sealing self-tightening device is suitable for various packing boxes at the oil wellhead. There is no need to make major modifications to the packing box. Only the gland needs to be processed. The support seat is moved forward relative to the support boss through the adjusting mechanism, so that the driven gear and the driving gear are out of meshing state. Then the driven gear and the gland are disassembled from the outside of the packing box, and the compression sleeve is removed to replace the sealing packing. After the operation is completed, the gland is tightened, and the driven gear and the gland are fixedly installed together. Then the gland is screwed together with the packing box. When the driven gear moves to correspond to the driving gear, the support seat is moved backward relative to the support boss through the adjusting mechanism, and finally the meshing relationship between the driving gear and the driven gear is restored.

[0015] You can also directly disassemble the driven gear and disengage it from the driving gear, then hang the driven gear on a rope hanger or a bare rod, disassemble the gland and remove the compression sleeve to replace the sealing packing. After the operation is completed, tighten the gland of the packing box, fix the driven gear and the gland together, and restore the meshing relationship between the driving gear and the driven gear.

[0016] When the sealing packing is punctured and leaked on site, the driving motor can tighten the sealing packing after the pumping unit keeps pumping, thereby preventing and stopping the sealing packing from further puncturing and leaking. It can replace the packing tightening operation of on-site oil workers and is suitable for wellhead sealing under various working conditions. It improves the safety and efficiency of wellhead sealing during oil production and can be promoted and used in domestic and foreign oil fields, with good development prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the main structure of the utility model when using the first to fifth embodiments.

[0018] Figure 2 It is a schematic diagram of the top view of the structure of the first to fifth embodiments of the present invention when in use.

[0019] Figure 3 It is a schematic diagram of the right side cross-sectional structure when using the first to fifth embodiments of the utility model.

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the utility model when the first to fifth embodiments are used.

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of the gland and the packing box in Embodiments 1 to 5 of the present invention.

[0022] Figure 6 It is a schematic diagram of the three-dimensional structure of the driven gear in Embodiments 1 to 5 of the present invention.

[0023] Figure 7 It is a schematic diagram of the three-dimensional structure of the support base in Embodiments 1 to 5 of the present invention.

[0024] Figure 8 This is a schematic diagram of the circuit structure of the sixth embodiment of the utility model.

[0025] The reference numerals in the accompanying drawings are: 1 is a packing box, 2 is a pressure cover, 3 is a sealing packing, 4 is a compression sleeve, 5 is a support seat, 6 is a driven gear, 7 is a driving gear, 8 is a supporting boss, 9 is a mounting hole, 10 is a positioning groove, 11 is a clamping block, 12 is a retaining spring, 13 is an adjusting top screw, 14 is a guide step, 15 is a limiting step, 16 is a driving motor, 17 is a clamping block, and 18 is a polished rod. DETAILED DESCRIPTION

[0026] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions.

[0027] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached manual. Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 It is determined by the layout direction.

[0028] The present invention is further described below in conjunction with the embodiments and drawings:

[0029] Embodiment 1: As shown in the attached Figures 1 to 5 As shown, the rod sealing self-tightening device includes a packing box 1, a pressure cover 2, a support seat 5, a driven gear 6, an adjusting mechanism, a driving gear 7 and a driving motor 16. A sealing packing 3 is arranged in the packing box 1. The upper end of the sealing packing 3 is provided with a compression sleeve 4 whose lower part is sleeved in the packing box 1. The inner side of the pressure cover 2 is screwed with the outer side of the upper part of the packing box 1. The outer side of the pressure cover 2 is detachably fixed with a driven gear 6. A supporting boss 8 which is narrow on the top and wide on the bottom is fixed on the outer side of the lower part of the packing box 1. A mounting hole 9 which passes through from top to bottom is arranged on the upper side of the rear portion of the support seat 5. The outer side of the upper part of the support boss 8 is located in the mounting hole 9. A driving motor 16 is fixedly installed on the lower side of the front portion of the support seat 5. The upper end of the output shaft of the driving motor 16 passes through the upper side of the support seat 5 and is fixedly installed with the driving gear 7. The driving gear 7 is meshed with the driven gear 6. An adjusting mechanism which can move the support seat 5 forward and backward and limit the position is provided between the support seat 5 and the support boss 8.

[0030] The supporting boss 8 and the packing box 1 can be integrally arranged, and the driving motor 16 is an existing well-known technology, such as a micro DC motor with a model of 90DC. One side of the supporting seat 5 is installed below the packing box 1 and does not affect the opening and closing of the gland 2. There is a bolt hole on the other side of the supporting seat 5, and the driving motor 16 is fixed by bolts. The driven gear 6 is installed at the bottom of the gland 2. When the packing box 1 is full of packing, the driven gear 6 and the upper part of the driving gear 7 are meshed with each other. When the packing box 1 is empty of packing, the driven gear 6 and the lower part of the driving gear 7 are meshed with each other.

[0031] The present light rod sealing self-tightening device is suitable for various packing boxes at the oil production wellhead. There is no need to make major modifications to the packing boxes. Only the gland 2 needs to be processed. If the sealing packing 3 needs to be replaced, the support seat 5 is moved forward relative to the support boss 8 through the adjusting mechanism, so that the driven gear 6 and the driving gear 7 are out of meshing state, and then the driven gear 6 and the gland 2 are removed from the outside of the packing box 1, and the tightening sleeve 4 is removed to replace the sealing packing 3. After the operation is completed, tighten the gland 2, fix the driven gear 6 and the gland 2 together, and then screw the gland 2 and the packing box 1 together. When the driven gear 6 moves to correspond to the driving gear 7, the support seat 5 is moved backward relative to the support boss 8 through the adjusting mechanism, and finally the meshing relationship between the driving gear 7 and the driven gear 6 is restored.

[0032] Alternatively, the driven gear 6 may be directly disassembled and separated from the driving gear 7, and then the driven gear 6 may be hung on a rope hanger or a bare rod 18, and the gland 2 may be disassembled and the compression sleeve 4 may be removed to replace the sealing packing 3. After the operation is completed, the gland 2 of the packing box 1 may be tightened, and the driven gear 6 may be fixedly installed together with the gland 2 to restore the meshing relationship between the driving gear 7 and the driven gear 6.

[0033] When the sealing packing 3 on site is punctured and leaked, the driving motor 16 can tighten the sealing packing 3 after the pumping unit continues to pump, thereby preventing and stopping the sealing packing 3 from continuing to puncture and leak. It can replace the packing tightening operation of on-site oil workers, is suitable for wellhead sealing under various working conditions, improves the safety and efficiency of wellhead sealing during oil production, can be promoted and used in oil fields at home and abroad, and has good development prospects.

[0034] The above-mentioned polished rod sealing self-tightening device can be further optimized and / or improved according to actual needs:

[0035] Embodiment 2: As an optimization of the above embodiment, as shown in the attached Figures 1 to 6 As shown, a plurality of positioning grooves 10 with openings upward are provided at intervals along the circumference on the outer side of the lower part of the pressure cover 2, a clamping block 11 matching the positioning groove 10 is fixed on the inner side of the driven gear 6, the driven gear 6 is clamped on the outer side of the lower part of the pressure cover 2, and a limiting ring groove is provided on the outer side of the lower part of the pressure cover 2 corresponding to the upper end position of the driven gear 6, and a retaining spring 12 is installed in the limiting ring groove.

[0036] According to requirements, a plurality of positioning grooves 10 with openings upward are provided at intervals along the circumference on the outer side of the lower part of the gland 2, and both sides of each positioning groove 10 extend to the outer side surface of the gland 2, that is, the outer contour cross-section of the outer side of the gland 2 is polygonal, such as a triangle, a quadrilateral, a pentagon or a hexagon. In the present embodiment, it is a quadrilateral, and there is a smooth transition between two adjacent sides of the quadrilateral. A clamping block 11 matching the positioning groove 10 is fixed on the inner side of the driven gear 6. The inner side surface of the driven gear 6 is a cylindrical surface. The clamping block 11 is arranged so that the lower end of the clamping block 11 is seated on the bottom surface of the positioning groove 10 at the corresponding position. The lower end of the gland 2 supports the driven gear 6 by limiting the clamping block 11, and the retaining spring 12 is clamped in the limiting ring groove, which makes the disassembly and assembly of the driven gear 6 more convenient. When the sealing packing 3 needs to be replaced, it is only necessary to disassemble the gland 2 and the driven gear 6, thereby reducing the difficulty of replacing the sealing packing 3.

[0037] When the sealing packing 3 is worn to the point where it cannot meet the wellhead sealing requirements, the sealing packing 3 is replaced. First, remove the retaining spring 12, pull the driven gear 6 upward from the outside of the gland 2, and disengage it from the driving gear 7. Then, hang the driven gear 6 on a rope hanger or a bare rod 18, disassemble the gland 2, remove the compression sleeve 4, and replace the sealing packing 3. After the operation is completed, tighten the packing box 1 gland 2, insert the driven gear 6 downward into the lower part of the gland 2, and use the retaining spring 12 to position it, so as to restore the matching between the driving gear 7 and the driven gear 6.

[0038] The present light rod sealing self-tightening device is suitable for various packing boxes 1 at the oil wellhead. There is no need to make major modifications to the packing box 1. It can be installed and used only by processing a limit ring groove in the middle and lower part of the four sides of the gland 2 (the wrench side, that is, the outer contour of the gland 2 corresponding to the positioning groove 10). If it is a packing box 1 with a handle, the handle needs to be removed by milling and the four sides need to be processed.

[0039] Embodiment 3: As an optimization of the above embodiment, as shown in the attached Figure 3 , 4 As shown in , 7, the adjustment mechanism includes an adjusting top screw 13, two guide steps 14 are symmetrically arranged on the left and right sides of the outer side of the upper part of the supporting boss 8, the mounting hole 9 is rectangular, the width of the mounting hole 9 matches the spacing between the vertical surfaces of the two guide steps 14, the length of the mounting hole 9 is larger than the outer diameter of the supporting boss 8, the supporting seat 5 is mounted on the outer side of the upper part of the supporting boss 8 and can move forward and backward along the guide step 14, the rear side of the supporting seat 5 is provided with an adjusting screw hole connected to the mounting hole 9, the adjusting top screw 13 is screwed in the adjusting screw hole, and a locking screw hole is provided on the rear side of the supporting boss 8 corresponding to the position of the adjusting screw hole, and the front end outer side of the adjusting top screw 13 is screwed in the locking screw hole.

[0040] The support seat 5 can be a plate-like structure, making the structure lighter. The inner side of the front of the mounting hole 9 can also be an arc surface that matches the outer side of the supporting boss 8. The upper outer side of the supporting boss 8 is symmetrically provided with two guide steps 14, so that the vertical surfaces of the two guide steps 14 can cooperate with the inner walls on both sides of the mounting hole 9.

[0041] When assembling the driving gear 7 and the driven gear 6, tighten the adjusting top screw 13 to make the support seat 5 move forward relative to the supporting boss 8, so that a certain distance is maintained between the rear side of the driving gear 7 and the packing box 1 to facilitate the installation of the pressure cover 2 and the driven gear 6, and then the driven gear 6 and the pressure cover 2 are installed and screwed to the outside of the packing box 1, and the pressure cover 2 is rotated to make the pressure cover 2 and the driven gear 6 move downward until the lower end surface of the driven gear 6 is located below the upper end surface of the driving gear 7, and then loosen the adjusting top screw 13 to make the support seat 5 move backward relative to the supporting boss 8 until the driving gear 7 and the driven gear 6 are fully meshed, at this time, the head of the adjusting top screw 13 is pressed against the rear side surface of the support seat 5, and the stud end of the adjusting top screw 13 is screwed with the locking screw hole, the front side of the support boss 8 is in contact with the front inner wall of the mounting hole 9, and the distance between the rear inner wall of the mounting hole 9 and the rear side of the support boss 8 is the largest.

[0042] When the sealing packing 3 needs to be replaced, the adjusting top screw 13 is rotated in the tightening direction. At this time, the distance between the rear side of the mounting hole 9 and the rear side of the supporting boss 8 gradually becomes smaller, that is, the supporting seat 5 moves forward relative to the supporting boss 8 under the action of the adjusting top screw 13. At this time, a spacing is generated between the front inner wall of the mounting hole 9 and the front side of the supporting boss 8, and the driving gear 7 and the driven gear 6 gradually disengage from the meshing state. Finally, the driving gear 7 and the driven gear 6 are separated from each other, and then the pressure cover 2 is rotated to make the pressure cover 2 and the driven gear 6 move upward. When the pressure cover 2 and the packing box 1 are separated from each other, the compression sleeve 4 is removed to replace the sealing packing 3. After the operation is completed, tighten the pressure cover 2 of the packing box 1, tighten the adjusting top screw 13, and adjust the top screw 13 to make the supporting seat 5 move to the initial position (rear side), and finally restore the mutual meshing between the driving gear 7 and the driven gear 6.

[0043] Embodiment 4: As an optimization of the above embodiment, as shown in the attached Figure 4 , 5 As shown, two limiting steps 15 are symmetrically arranged on the front and back sides of the upper outer side of the supporting boss 8 , and the distance between the vertical surfaces of the two limiting steps 15 is smaller than the length of the mounting hole 9 .

[0044] The locking screw hole is arranged on the vertical surface of the rear limiting step 15. The two limiting steps 15 and the two guide steps 14 are arranged, that is, the outer contour cross-section of the upper part of the supporting boss 8 is polygonal, such as a quadrilateral or a hexagon. In this embodiment, it is a quadrilateral, and there is a smooth transition between the two adjacent sides of the polygon. A rounded structure is arranged between the four inner walls of the mounting hole 9. The front side, left side and right side of the mounting hole 9 are all clearance-matched with the front side, left side and right side of the supporting boss 8. The spacing between the vertical surfaces of the two limiting steps 15 is smaller than the spacing between the mounting holes. 9, in this embodiment, the difference between the distance between the front side and the rear side of the mounting hole 9 and the distance between the vertical surfaces of the two limiting steps 15 is 10 to 20 mm. The setting of the two limiting steps 15 can increase the contact surface between the inner wall of the mounting hole 9 and the outer side of the supporting boss 8, and can also make the adjusting top screw 13 more stable after tightening, thereby improving the stability between the support seat 5 and the supporting boss 8. In order to facilitate the disassembly and assembly of the packing box 1, the outer contour cross-section of the lower part of the supporting boss 8 can also be polygonal, such as a quadrilateral or a hexagon.

[0045] Embodiment 5: As an optimization of the above embodiment, as shown in the attached Figures 1 to 6 As shown, the tooth width of the driven gear 6 is 10 to 20 mm, and the sum of the stroke height and the tooth width of the driven gear 6 is smaller than the tooth width of the driving gear 7 .

[0046] In this embodiment, the tooth width of the driving gear 7 is 60 mm, the tooth width of the driven gear 6 is 15 mm, and the stroke height of the packing tightening operation is 28 mm, that is, the stroke height of the driven gear 6 is 28 mm.

[0047] The driving motor 16 is installed on the wellhead packing box 1 through the supporting seat 5. The output shaft of the driving motor 16 is parallel to the polished rod 18 and keeps a certain distance from the polished rod 18, so that the driving gear 7 installed on the output shaft of the driving motor 16 and the driven gear 6 installed on the gland 2 are parallel axes and transmit in the same direction to realize the control of the packing tightening operation of the packing box 1. The driven gear 6 is installed at the bottom of the gland 2. When the packing box 1 is full of packing, the driven gear 6 is meshed with the top of the driving gear 7. When the packing box 1 is empty of packing, the driven gear 6 is meshed with the bottom of the driving gear 7.

[0048] Embodiment 6: As an optimization of the above embodiment, as shown in the attached Figure 8 As shown, it also includes a battery module, a solar power generation module and a control module. The solar power generation module is connected to the battery module, the battery module is connected to the control module, and the control module is connected to the drive motor 16.

[0049] The battery module and the solar power generation module constitute an existing well-known solar cell power supply system. The control module can be an existing well-known PLC programmable control module. The battery module and the solar power generation module are installed at an appropriate position near the wellhead packing box 1 to realize independent power supply. The average daily packing operation times of a single well in the well area are counted. The battery module can meet the driving motor 16 to realize 5 to 10 times the average daily packing execution times, and can meet the power supply in winter and when there is insufficient light. When the power storage of the battery module is insufficient, the control module issues a low-power alarm to charge the battery module. After the battery module meets the power support of the driving motor 16, the automatic packing operation is restored. The control module can also use the on-site 24V DC power supply for power supply.

[0050] The battery module and solar power generation module meet the needs of short working hours for packing tightening operations, can realize independent power supply, green energy saving, easy installation, and the control module receives wellhead signals or remote control instructions, simulates the on-site packing tightening operation of employees, and can record the operation process. This device can automatically tighten the wellhead packing without stopping the pumping unit, and can also tighten the wellhead packing by remote control to prevent and stop the packing from continuing to leak, thereby improving the safety and efficiency of the wellhead seal during oil production.

[0051] The above technical features respectively constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A polished rod sealing self-tightening device, characterized in that The gear train comprises a packing box, a pressure cover, a support seat, a driven gear, an adjusting mechanism, a driving gear and a driving motor, wherein a sealing packing is arranged in the packing box, the upper end of the sealing packing is provided with a compression sleeve which is sleeved in the packing box at the lower end, the inner side of the pressure cover is screwed with the outer side of the upper part of the packing box, the outer side of the pressure cover is detachably fixed with a driven gear, the outer side of the lower part of the packing box is fixed with a supporting boss which is narrow at the top and wide at the bottom, the upper side of the rear portion of the support seat is provided with a mounting hole which passes through from top to bottom, the outer side of the upper part of the supporting boss is located in the mounting hole, a driving motor is fixedly installed on the lower side of the front portion of the support seat, the upper end of the output shaft of the driving motor passes through the upper side of the support seat and is fixedly installed with the driving gear, the driving gear and the driven gear are meshed with each other, and an adjusting mechanism which can enable the support seat to move forwards and backwards and limit its position is provided between the support seat and the supporting boss.

2. The polished rod sealing self-tightening device according to claim 1, characterized in that The outer side of the lower part of the pressure cover is provided with a plurality of positioning grooves opening upward at intervals along the circumference, and a clamping block matching the positioning groove is fixed on the inner side of the driven gear. The driven gear is clamped on the outer side of the lower part of the pressure cover, and a limiting ring groove is provided on the outer side of the lower part of the pressure cover corresponding to the upper end position of the driven gear, and a retaining spring is installed in the limiting ring groove.

3. The polished rod sealing self-tightening device according to claim 1 or 2, characterized in that The adjustment mechanism includes an adjusting top screw, two guide steps are symmetrically arranged on the left and right outer sides of the upper part of the support boss, the mounting hole is rectangular, the width of the mounting hole matches the spacing between the vertical surfaces of the two guide steps, the length of the mounting hole is greater than the outer diameter of the support boss, the support seat is sleeved on the outer side of the upper part of the support boss and can move forward and backward along the guide steps, an adjusting screw hole connected to the mounting hole is arranged on the rear side of the support seat, an adjusting top screw is threaded in the adjusting screw hole, a locking screw hole is arranged on the rear side of the support boss corresponding to the position of the adjusting screw hole, and the front end outer side of the adjusting top screw is threaded in the locking screw hole.

4. The polished rod sealing self-tightening device according to claim 3, characterized in that Two limiting steps are symmetrically arranged on the outer side of the upper part of the supporting boss, and the distance between the vertical surfaces of the two limiting steps is smaller than the length of the mounting hole.

5. The polished rod sealing self-tightening device according to claim 1, 2 or 4, characterized in that The tooth width of the driven gear is 10 to 20 mm, and the sum of the stroke height and the tooth width of the driven gear is smaller than the tooth width of the driving gear.

6. The polished rod sealing self-tightening device according to claim 3, characterized in that The tooth width of the driven gear is 10 to 20 mm, and the sum of the stroke height and the tooth width of the driven gear is smaller than the tooth width of the driving gear.

7. The polished rod sealing self-tightening device according to claim 1, 2, 4 or 6, characterized in that It also includes a battery module, a solar power generation module and a control module. The solar power generation module is connected to the battery module, the battery module is connected to the control module, and the control module is connected to the drive motor.

8. The polished rod sealing self-tightening device according to claim 3, characterized in that It also includes a battery module, a solar power generation module and a control module. The solar power generation module is connected to the battery module, the battery module is connected to the control module, and the control module is connected to the drive motor.

9. The polished rod sealing self-tightening device according to claim 5, characterized in that It also includes a battery module, a solar power generation module and a control module. The solar power generation module is connected to the battery module, the battery module is connected to the control module, and the control module is connected to the drive motor.

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